SemaDecl.cpp revision 7a8a2e3c7ff283bc98b5292b6a579d4fca63e36b
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Sema/DelayedDiagnostic.h" 37#include "clang/Basic/SourceManager.h" 38#include "clang/Basic/TargetInfo.h" 39// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 40#include "clang/Lex/Preprocessor.h" 41#include "clang/Lex/HeaderSearch.h" 42#include "clang/Lex/ModuleLoader.h" 43#include "llvm/ADT/Triple.h" 44#include <algorithm> 45#include <cstring> 46#include <functional> 47using namespace clang; 48using namespace sema; 49 50Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 51 if (OwnedType) { 52 Decl *Group[2] = { OwnedType, Ptr }; 53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 54 } 55 56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 57} 58 59/// \brief If the identifier refers to a type name within this scope, 60/// return the declaration of that type. 61/// 62/// This routine performs ordinary name lookup of the identifier II 63/// within the given scope, with optional C++ scope specifier SS, to 64/// determine whether the name refers to a type. If so, returns an 65/// opaque pointer (actually a QualType) corresponding to that 66/// type. Otherwise, returns NULL. 67/// 68/// If name lookup results in an ambiguity, this routine will complain 69/// and then return NULL. 70ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 71 Scope *S, CXXScopeSpec *SS, 72 bool isClassName, bool HasTrailingDot, 73 ParsedType ObjectTypePtr, 74 bool WantNontrivialTypeSourceInfo, 75 IdentifierInfo **CorrectedII) { 76 // Determine where we will perform name lookup. 77 DeclContext *LookupCtx = 0; 78 if (ObjectTypePtr) { 79 QualType ObjectType = ObjectTypePtr.get(); 80 if (ObjectType->isRecordType()) 81 LookupCtx = computeDeclContext(ObjectType); 82 } else if (SS && SS->isNotEmpty()) { 83 LookupCtx = computeDeclContext(*SS, false); 84 85 if (!LookupCtx) { 86 if (isDependentScopeSpecifier(*SS)) { 87 // C++ [temp.res]p3: 88 // A qualified-id that refers to a type and in which the 89 // nested-name-specifier depends on a template-parameter (14.6.2) 90 // shall be prefixed by the keyword typename to indicate that the 91 // qualified-id denotes a type, forming an 92 // elaborated-type-specifier (7.1.5.3). 93 // 94 // We therefore do not perform any name lookup if the result would 95 // refer to a member of an unknown specialization. 96 if (!isClassName) 97 return ParsedType(); 98 99 // We know from the grammar that this name refers to a type, 100 // so build a dependent node to describe the type. 101 if (WantNontrivialTypeSourceInfo) 102 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 103 104 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 105 QualType T = 106 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 107 II, NameLoc); 108 109 return ParsedType::make(T); 110 } 111 112 return ParsedType(); 113 } 114 115 if (!LookupCtx->isDependentContext() && 116 RequireCompleteDeclContext(*SS, LookupCtx)) 117 return ParsedType(); 118 } 119 120 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 121 // lookup for class-names. 122 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 123 LookupOrdinaryName; 124 LookupResult Result(*this, &II, NameLoc, Kind); 125 if (LookupCtx) { 126 // Perform "qualified" name lookup into the declaration context we 127 // computed, which is either the type of the base of a member access 128 // expression or the declaration context associated with a prior 129 // nested-name-specifier. 130 LookupQualifiedName(Result, LookupCtx); 131 132 if (ObjectTypePtr && Result.empty()) { 133 // C++ [basic.lookup.classref]p3: 134 // If the unqualified-id is ~type-name, the type-name is looked up 135 // in the context of the entire postfix-expression. If the type T of 136 // the object expression is of a class type C, the type-name is also 137 // looked up in the scope of class C. At least one of the lookups shall 138 // find a name that refers to (possibly cv-qualified) T. 139 LookupName(Result, S); 140 } 141 } else { 142 // Perform unqualified name lookup. 143 LookupName(Result, S); 144 } 145 146 NamedDecl *IIDecl = 0; 147 switch (Result.getResultKind()) { 148 case LookupResult::NotFound: 149 case LookupResult::NotFoundInCurrentInstantiation: 150 if (CorrectedII) { 151 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 152 Kind, S, SS, 0, false, 153 Sema::CTC_Type); 154 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 155 TemplateTy Template; 156 bool MemberOfUnknownSpecialization; 157 UnqualifiedId TemplateName; 158 TemplateName.setIdentifier(NewII, NameLoc); 159 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 160 CXXScopeSpec NewSS, *NewSSPtr = SS; 161 if (SS && NNS) { 162 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 163 NewSSPtr = &NewSS; 164 } 165 if (Correction && (NNS || NewII != &II) && 166 // Ignore a correction to a template type as the to-be-corrected 167 // identifier is not a template (typo correction for template names 168 // is handled elsewhere). 169 !(getLangOptions().CPlusPlus && NewSSPtr && 170 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 171 false, Template, MemberOfUnknownSpecialization))) { 172 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 173 isClassName, HasTrailingDot, ObjectTypePtr, 174 WantNontrivialTypeSourceInfo); 175 if (Ty) { 176 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 177 std::string CorrectedQuotedStr( 178 Correction.getQuoted(getLangOptions())); 179 Diag(NameLoc, diag::err_unknown_typename_suggest) 180 << Result.getLookupName() << CorrectedQuotedStr 181 << FixItHint::CreateReplacement(SourceRange(NameLoc), 182 CorrectedStr); 183 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 184 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 185 << CorrectedQuotedStr; 186 187 if (SS && NNS) 188 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 189 *CorrectedII = NewII; 190 return Ty; 191 } 192 } 193 } 194 // If typo correction failed or was not performed, fall through 195 case LookupResult::FoundOverloaded: 196 case LookupResult::FoundUnresolvedValue: 197 Result.suppressDiagnostics(); 198 return ParsedType(); 199 200 case LookupResult::Ambiguous: 201 // Recover from type-hiding ambiguities by hiding the type. We'll 202 // do the lookup again when looking for an object, and we can 203 // diagnose the error then. If we don't do this, then the error 204 // about hiding the type will be immediately followed by an error 205 // that only makes sense if the identifier was treated like a type. 206 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 207 Result.suppressDiagnostics(); 208 return ParsedType(); 209 } 210 211 // Look to see if we have a type anywhere in the list of results. 212 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 213 Res != ResEnd; ++Res) { 214 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 215 if (!IIDecl || 216 (*Res)->getLocation().getRawEncoding() < 217 IIDecl->getLocation().getRawEncoding()) 218 IIDecl = *Res; 219 } 220 } 221 222 if (!IIDecl) { 223 // None of the entities we found is a type, so there is no way 224 // to even assume that the result is a type. In this case, don't 225 // complain about the ambiguity. The parser will either try to 226 // perform this lookup again (e.g., as an object name), which 227 // will produce the ambiguity, or will complain that it expected 228 // a type name. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 233 // We found a type within the ambiguous lookup; diagnose the 234 // ambiguity and then return that type. This might be the right 235 // answer, or it might not be, but it suppresses any attempt to 236 // perform the name lookup again. 237 break; 238 239 case LookupResult::Found: 240 IIDecl = Result.getFoundDecl(); 241 break; 242 } 243 244 assert(IIDecl && "Didn't find decl"); 245 246 QualType T; 247 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 248 DiagnoseUseOfDecl(IIDecl, NameLoc); 249 250 if (T.isNull()) 251 T = Context.getTypeDeclType(TD); 252 253 if (SS && SS->isNotEmpty()) { 254 if (WantNontrivialTypeSourceInfo) { 255 // Construct a type with type-source information. 256 TypeLocBuilder Builder; 257 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 258 259 T = getElaboratedType(ETK_None, *SS, T); 260 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 261 ElabTL.setKeywordLoc(SourceLocation()); 262 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 263 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 264 } else { 265 T = getElaboratedType(ETK_None, *SS, T); 266 } 267 } 268 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 269 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 270 if (!HasTrailingDot) 271 T = Context.getObjCInterfaceType(IDecl); 272 } 273 274 if (T.isNull()) { 275 // If it's not plausibly a type, suppress diagnostics. 276 Result.suppressDiagnostics(); 277 return ParsedType(); 278 } 279 return ParsedType::make(T); 280} 281 282/// isTagName() - This method is called *for error recovery purposes only* 283/// to determine if the specified name is a valid tag name ("struct foo"). If 284/// so, this returns the TST for the tag corresponding to it (TST_enum, 285/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 286/// where the user forgot to specify the tag. 287DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 288 // Do a tag name lookup in this scope. 289 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 290 LookupName(R, S, false); 291 R.suppressDiagnostics(); 292 if (R.getResultKind() == LookupResult::Found) 293 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 294 switch (TD->getTagKind()) { 295 default: return DeclSpec::TST_unspecified; 296 case TTK_Struct: return DeclSpec::TST_struct; 297 case TTK_Union: return DeclSpec::TST_union; 298 case TTK_Class: return DeclSpec::TST_class; 299 case TTK_Enum: return DeclSpec::TST_enum; 300 } 301 } 302 303 return DeclSpec::TST_unspecified; 304} 305 306/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 307/// if a CXXScopeSpec's type is equal to the type of one of the base classes 308/// then downgrade the missing typename error to a warning. 309/// This is needed for MSVC compatibility; Example: 310/// @code 311/// template<class T> class A { 312/// public: 313/// typedef int TYPE; 314/// }; 315/// template<class T> class B : public A<T> { 316/// public: 317/// A<T>::TYPE a; // no typename required because A<T> is a base class. 318/// }; 319/// @endcode 320bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 321 if (CurContext->isRecord()) { 322 const Type *Ty = SS->getScopeRep()->getAsType(); 323 324 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 325 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 326 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 327 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 328 return true; 329 return S->isFunctionPrototypeScope(); 330 } 331 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 332} 333 334bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 335 SourceLocation IILoc, 336 Scope *S, 337 CXXScopeSpec *SS, 338 ParsedType &SuggestedType) { 339 // We don't have anything to suggest (yet). 340 SuggestedType = ParsedType(); 341 342 // There may have been a typo in the name of the type. Look up typo 343 // results, in case we have something that we can suggest. 344 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 345 LookupOrdinaryName, S, SS, NULL, 346 false, CTC_Type)) { 347 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 348 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 349 350 if (Corrected.isKeyword()) { 351 // We corrected to a keyword. 352 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 353 Diag(IILoc, diag::err_unknown_typename_suggest) 354 << &II << CorrectedQuotedStr; 355 return true; 356 } else { 357 NamedDecl *Result = Corrected.getCorrectionDecl(); 358 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 359 !Result->isInvalidDecl()) { 360 // We found a similarly-named type or interface; suggest that. 361 if (!SS || !SS->isSet()) 362 Diag(IILoc, diag::err_unknown_typename_suggest) 363 << &II << CorrectedQuotedStr 364 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 365 else if (DeclContext *DC = computeDeclContext(*SS, false)) 366 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 367 << &II << DC << CorrectedQuotedStr << SS->getRange() 368 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 369 else 370 llvm_unreachable("could not have corrected a typo here"); 371 372 Diag(Result->getLocation(), diag::note_previous_decl) 373 << CorrectedQuotedStr; 374 375 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 376 false, false, ParsedType(), 377 /*NonTrivialTypeSourceInfo=*/true); 378 return true; 379 } 380 } 381 } 382 383 if (getLangOptions().CPlusPlus) { 384 // See if II is a class template that the user forgot to pass arguments to. 385 UnqualifiedId Name; 386 Name.setIdentifier(&II, IILoc); 387 CXXScopeSpec EmptySS; 388 TemplateTy TemplateResult; 389 bool MemberOfUnknownSpecialization; 390 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 391 Name, ParsedType(), true, TemplateResult, 392 MemberOfUnknownSpecialization) == TNK_Type_template) { 393 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 394 Diag(IILoc, diag::err_template_missing_args) << TplName; 395 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 396 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 397 << TplDecl->getTemplateParameters()->getSourceRange(); 398 } 399 return true; 400 } 401 } 402 403 // FIXME: Should we move the logic that tries to recover from a missing tag 404 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 405 406 if (!SS || (!SS->isSet() && !SS->isInvalid())) 407 Diag(IILoc, diag::err_unknown_typename) << &II; 408 else if (DeclContext *DC = computeDeclContext(*SS, false)) 409 Diag(IILoc, diag::err_typename_nested_not_found) 410 << &II << DC << SS->getRange(); 411 else if (isDependentScopeSpecifier(*SS)) { 412 unsigned DiagID = diag::err_typename_missing; 413 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 414 DiagID = diag::warn_typename_missing; 415 416 Diag(SS->getRange().getBegin(), DiagID) 417 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 418 << SourceRange(SS->getRange().getBegin(), IILoc) 419 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 420 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 421 .get(); 422 } else { 423 assert(SS && SS->isInvalid() && 424 "Invalid scope specifier has already been diagnosed"); 425 } 426 427 return true; 428} 429 430/// \brief Determine whether the given result set contains either a type name 431/// or 432static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 433 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 434 NextToken.is(tok::less); 435 436 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 437 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 438 return true; 439 440 if (CheckTemplate && isa<TemplateDecl>(*I)) 441 return true; 442 } 443 444 return false; 445} 446 447Sema::NameClassification Sema::ClassifyName(Scope *S, 448 CXXScopeSpec &SS, 449 IdentifierInfo *&Name, 450 SourceLocation NameLoc, 451 const Token &NextToken) { 452 DeclarationNameInfo NameInfo(Name, NameLoc); 453 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 454 455 if (NextToken.is(tok::coloncolon)) { 456 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 457 QualType(), false, SS, 0, false); 458 459 } 460 461 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 462 LookupParsedName(Result, S, &SS, !CurMethod); 463 464 // Perform lookup for Objective-C instance variables (including automatically 465 // synthesized instance variables), if we're in an Objective-C method. 466 // FIXME: This lookup really, really needs to be folded in to the normal 467 // unqualified lookup mechanism. 468 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 469 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 470 if (E.get() || E.isInvalid()) 471 return E; 472 } 473 474 bool SecondTry = false; 475 bool IsFilteredTemplateName = false; 476 477Corrected: 478 switch (Result.getResultKind()) { 479 case LookupResult::NotFound: 480 // If an unqualified-id is followed by a '(', then we have a function 481 // call. 482 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 483 // In C++, this is an ADL-only call. 484 // FIXME: Reference? 485 if (getLangOptions().CPlusPlus) 486 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 487 488 // C90 6.3.2.2: 489 // If the expression that precedes the parenthesized argument list in a 490 // function call consists solely of an identifier, and if no 491 // declaration is visible for this identifier, the identifier is 492 // implicitly declared exactly as if, in the innermost block containing 493 // the function call, the declaration 494 // 495 // extern int identifier (); 496 // 497 // appeared. 498 // 499 // We also allow this in C99 as an extension. 500 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 501 Result.addDecl(D); 502 Result.resolveKind(); 503 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 504 } 505 } 506 507 // In C, we first see whether there is a tag type by the same name, in 508 // which case it's likely that the user just forget to write "enum", 509 // "struct", or "union". 510 if (!getLangOptions().CPlusPlus && !SecondTry) { 511 Result.clear(LookupTagName); 512 LookupParsedName(Result, S, &SS); 513 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 514 const char *TagName = 0; 515 const char *FixItTagName = 0; 516 switch (Tag->getTagKind()) { 517 case TTK_Class: 518 TagName = "class"; 519 FixItTagName = "class "; 520 break; 521 522 case TTK_Enum: 523 TagName = "enum"; 524 FixItTagName = "enum "; 525 break; 526 527 case TTK_Struct: 528 TagName = "struct"; 529 FixItTagName = "struct "; 530 break; 531 532 case TTK_Union: 533 TagName = "union"; 534 FixItTagName = "union "; 535 break; 536 } 537 538 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 539 << Name << TagName << getLangOptions().CPlusPlus 540 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 541 break; 542 } 543 544 Result.clear(LookupOrdinaryName); 545 } 546 547 // Perform typo correction to determine if there is another name that is 548 // close to this name. 549 if (!SecondTry) { 550 SecondTry = true; 551 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 552 Result.getLookupKind(), S, 553 &SS)) { 554 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 555 unsigned QualifiedDiag = diag::err_no_member_suggest; 556 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 557 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 558 559 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 560 NamedDecl *UnderlyingFirstDecl 561 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 562 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 563 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 564 UnqualifiedDiag = diag::err_no_template_suggest; 565 QualifiedDiag = diag::err_no_member_template_suggest; 566 } else if (UnderlyingFirstDecl && 567 (isa<TypeDecl>(UnderlyingFirstDecl) || 568 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 569 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 570 UnqualifiedDiag = diag::err_unknown_typename_suggest; 571 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 572 } 573 574 if (SS.isEmpty()) 575 Diag(NameLoc, UnqualifiedDiag) 576 << Name << CorrectedQuotedStr 577 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 578 else 579 Diag(NameLoc, QualifiedDiag) 580 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 581 << SS.getRange() 582 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 583 584 // Update the name, so that the caller has the new name. 585 Name = Corrected.getCorrectionAsIdentifierInfo(); 586 587 // Also update the LookupResult... 588 // FIXME: This should probably go away at some point 589 Result.clear(); 590 Result.setLookupName(Corrected.getCorrection()); 591 if (FirstDecl) Result.addDecl(FirstDecl); 592 593 // Typo correction corrected to a keyword. 594 if (Corrected.isKeyword()) 595 return Corrected.getCorrectionAsIdentifierInfo(); 596 597 if (FirstDecl) 598 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 599 << CorrectedQuotedStr; 600 601 // If we found an Objective-C instance variable, let 602 // LookupInObjCMethod build the appropriate expression to 603 // reference the ivar. 604 // FIXME: This is a gross hack. 605 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 606 Result.clear(); 607 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 608 return move(E); 609 } 610 611 goto Corrected; 612 } 613 } 614 615 // We failed to correct; just fall through and let the parser deal with it. 616 Result.suppressDiagnostics(); 617 return NameClassification::Unknown(); 618 619 case LookupResult::NotFoundInCurrentInstantiation: 620 // We performed name lookup into the current instantiation, and there were 621 // dependent bases, so we treat this result the same way as any other 622 // dependent nested-name-specifier. 623 624 // C++ [temp.res]p2: 625 // A name used in a template declaration or definition and that is 626 // dependent on a template-parameter is assumed not to name a type 627 // unless the applicable name lookup finds a type name or the name is 628 // qualified by the keyword typename. 629 // 630 // FIXME: If the next token is '<', we might want to ask the parser to 631 // perform some heroics to see if we actually have a 632 // template-argument-list, which would indicate a missing 'template' 633 // keyword here. 634 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 635 636 case LookupResult::Found: 637 case LookupResult::FoundOverloaded: 638 case LookupResult::FoundUnresolvedValue: 639 break; 640 641 case LookupResult::Ambiguous: 642 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 643 hasAnyAcceptableTemplateNames(Result)) { 644 // C++ [temp.local]p3: 645 // A lookup that finds an injected-class-name (10.2) can result in an 646 // ambiguity in certain cases (for example, if it is found in more than 647 // one base class). If all of the injected-class-names that are found 648 // refer to specializations of the same class template, and if the name 649 // is followed by a template-argument-list, the reference refers to the 650 // class template itself and not a specialization thereof, and is not 651 // ambiguous. 652 // 653 // This filtering can make an ambiguous result into an unambiguous one, 654 // so try again after filtering out template names. 655 FilterAcceptableTemplateNames(Result); 656 if (!Result.isAmbiguous()) { 657 IsFilteredTemplateName = true; 658 break; 659 } 660 } 661 662 // Diagnose the ambiguity and return an error. 663 return NameClassification::Error(); 664 } 665 666 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 667 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 668 // C++ [temp.names]p3: 669 // After name lookup (3.4) finds that a name is a template-name or that 670 // an operator-function-id or a literal- operator-id refers to a set of 671 // overloaded functions any member of which is a function template if 672 // this is followed by a <, the < is always taken as the delimiter of a 673 // template-argument-list and never as the less-than operator. 674 if (!IsFilteredTemplateName) 675 FilterAcceptableTemplateNames(Result); 676 677 if (!Result.empty()) { 678 bool IsFunctionTemplate; 679 TemplateName Template; 680 if (Result.end() - Result.begin() > 1) { 681 IsFunctionTemplate = true; 682 Template = Context.getOverloadedTemplateName(Result.begin(), 683 Result.end()); 684 } else { 685 TemplateDecl *TD 686 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 687 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 688 689 if (SS.isSet() && !SS.isInvalid()) 690 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 691 /*TemplateKeyword=*/false, 692 TD); 693 else 694 Template = TemplateName(TD); 695 } 696 697 if (IsFunctionTemplate) { 698 // Function templates always go through overload resolution, at which 699 // point we'll perform the various checks (e.g., accessibility) we need 700 // to based on which function we selected. 701 Result.suppressDiagnostics(); 702 703 return NameClassification::FunctionTemplate(Template); 704 } 705 706 return NameClassification::TypeTemplate(Template); 707 } 708 } 709 710 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 711 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 712 DiagnoseUseOfDecl(Type, NameLoc); 713 QualType T = Context.getTypeDeclType(Type); 714 return ParsedType::make(T); 715 } 716 717 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 718 if (!Class) { 719 // FIXME: It's unfortunate that we don't have a Type node for handling this. 720 if (ObjCCompatibleAliasDecl *Alias 721 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 722 Class = Alias->getClassInterface(); 723 } 724 725 if (Class) { 726 DiagnoseUseOfDecl(Class, NameLoc); 727 728 if (NextToken.is(tok::period)) { 729 // Interface. <something> is parsed as a property reference expression. 730 // Just return "unknown" as a fall-through for now. 731 Result.suppressDiagnostics(); 732 return NameClassification::Unknown(); 733 } 734 735 QualType T = Context.getObjCInterfaceType(Class); 736 return ParsedType::make(T); 737 } 738 739 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 740 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 741 742 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 743 return BuildDeclarationNameExpr(SS, Result, ADL); 744} 745 746// Determines the context to return to after temporarily entering a 747// context. This depends in an unnecessarily complicated way on the 748// exact ordering of callbacks from the parser. 749DeclContext *Sema::getContainingDC(DeclContext *DC) { 750 751 // Functions defined inline within classes aren't parsed until we've 752 // finished parsing the top-level class, so the top-level class is 753 // the context we'll need to return to. 754 if (isa<FunctionDecl>(DC)) { 755 DC = DC->getLexicalParent(); 756 757 // A function not defined within a class will always return to its 758 // lexical context. 759 if (!isa<CXXRecordDecl>(DC)) 760 return DC; 761 762 // A C++ inline method/friend is parsed *after* the topmost class 763 // it was declared in is fully parsed ("complete"); the topmost 764 // class is the context we need to return to. 765 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 766 DC = RD; 767 768 // Return the declaration context of the topmost class the inline method is 769 // declared in. 770 return DC; 771 } 772 773 return DC->getLexicalParent(); 774} 775 776void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 777 assert(getContainingDC(DC) == CurContext && 778 "The next DeclContext should be lexically contained in the current one."); 779 CurContext = DC; 780 S->setEntity(DC); 781} 782 783void Sema::PopDeclContext() { 784 assert(CurContext && "DeclContext imbalance!"); 785 786 CurContext = getContainingDC(CurContext); 787 assert(CurContext && "Popped translation unit!"); 788} 789 790/// EnterDeclaratorContext - Used when we must lookup names in the context 791/// of a declarator's nested name specifier. 792/// 793void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 794 // C++0x [basic.lookup.unqual]p13: 795 // A name used in the definition of a static data member of class 796 // X (after the qualified-id of the static member) is looked up as 797 // if the name was used in a member function of X. 798 // C++0x [basic.lookup.unqual]p14: 799 // If a variable member of a namespace is defined outside of the 800 // scope of its namespace then any name used in the definition of 801 // the variable member (after the declarator-id) is looked up as 802 // if the definition of the variable member occurred in its 803 // namespace. 804 // Both of these imply that we should push a scope whose context 805 // is the semantic context of the declaration. We can't use 806 // PushDeclContext here because that context is not necessarily 807 // lexically contained in the current context. Fortunately, 808 // the containing scope should have the appropriate information. 809 810 assert(!S->getEntity() && "scope already has entity"); 811 812#ifndef NDEBUG 813 Scope *Ancestor = S->getParent(); 814 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 815 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 816#endif 817 818 CurContext = DC; 819 S->setEntity(DC); 820} 821 822void Sema::ExitDeclaratorContext(Scope *S) { 823 assert(S->getEntity() == CurContext && "Context imbalance!"); 824 825 // Switch back to the lexical context. The safety of this is 826 // enforced by an assert in EnterDeclaratorContext. 827 Scope *Ancestor = S->getParent(); 828 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 829 CurContext = (DeclContext*) Ancestor->getEntity(); 830 831 // We don't need to do anything with the scope, which is going to 832 // disappear. 833} 834 835 836void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 837 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 838 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 839 // We assume that the caller has already called 840 // ActOnReenterTemplateScope 841 FD = TFD->getTemplatedDecl(); 842 } 843 if (!FD) 844 return; 845 846 PushDeclContext(S, FD); 847 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 848 ParmVarDecl *Param = FD->getParamDecl(P); 849 // If the parameter has an identifier, then add it to the scope 850 if (Param->getIdentifier()) { 851 S->AddDecl(Param); 852 IdResolver.AddDecl(Param); 853 } 854 } 855} 856 857 858/// \brief Determine whether we allow overloading of the function 859/// PrevDecl with another declaration. 860/// 861/// This routine determines whether overloading is possible, not 862/// whether some new function is actually an overload. It will return 863/// true in C++ (where we can always provide overloads) or, as an 864/// extension, in C when the previous function is already an 865/// overloaded function declaration or has the "overloadable" 866/// attribute. 867static bool AllowOverloadingOfFunction(LookupResult &Previous, 868 ASTContext &Context) { 869 if (Context.getLangOptions().CPlusPlus) 870 return true; 871 872 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 873 return true; 874 875 return (Previous.getResultKind() == LookupResult::Found 876 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 877} 878 879/// Add this decl to the scope shadowed decl chains. 880void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 881 // Move up the scope chain until we find the nearest enclosing 882 // non-transparent context. The declaration will be introduced into this 883 // scope. 884 while (S->getEntity() && 885 ((DeclContext *)S->getEntity())->isTransparentContext()) 886 S = S->getParent(); 887 888 // Add scoped declarations into their context, so that they can be 889 // found later. Declarations without a context won't be inserted 890 // into any context. 891 if (AddToContext) 892 CurContext->addDecl(D); 893 894 // Out-of-line definitions shouldn't be pushed into scope in C++. 895 // Out-of-line variable and function definitions shouldn't even in C. 896 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 897 D->isOutOfLine() && 898 !D->getDeclContext()->getRedeclContext()->Equals( 899 D->getLexicalDeclContext()->getRedeclContext())) 900 return; 901 902 // Template instantiations should also not be pushed into scope. 903 if (isa<FunctionDecl>(D) && 904 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 905 return; 906 907 // If this replaces anything in the current scope, 908 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 909 IEnd = IdResolver.end(); 910 for (; I != IEnd; ++I) { 911 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 912 S->RemoveDecl(*I); 913 IdResolver.RemoveDecl(*I); 914 915 // Should only need to replace one decl. 916 break; 917 } 918 } 919 920 S->AddDecl(D); 921 922 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 923 // Implicitly-generated labels may end up getting generated in an order that 924 // isn't strictly lexical, which breaks name lookup. Be careful to insert 925 // the label at the appropriate place in the identifier chain. 926 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 927 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 928 if (IDC == CurContext) { 929 if (!S->isDeclScope(*I)) 930 continue; 931 } else if (IDC->Encloses(CurContext)) 932 break; 933 } 934 935 IdResolver.InsertDeclAfter(I, D); 936 } else { 937 IdResolver.AddDecl(D); 938 } 939} 940 941bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 942 bool ExplicitInstantiationOrSpecialization) { 943 return IdResolver.isDeclInScope(D, Ctx, Context, S, 944 ExplicitInstantiationOrSpecialization); 945} 946 947Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 948 DeclContext *TargetDC = DC->getPrimaryContext(); 949 do { 950 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 951 if (ScopeDC->getPrimaryContext() == TargetDC) 952 return S; 953 } while ((S = S->getParent())); 954 955 return 0; 956} 957 958static bool isOutOfScopePreviousDeclaration(NamedDecl *, 959 DeclContext*, 960 ASTContext&); 961 962/// Filters out lookup results that don't fall within the given scope 963/// as determined by isDeclInScope. 964void Sema::FilterLookupForScope(LookupResult &R, 965 DeclContext *Ctx, Scope *S, 966 bool ConsiderLinkage, 967 bool ExplicitInstantiationOrSpecialization) { 968 LookupResult::Filter F = R.makeFilter(); 969 while (F.hasNext()) { 970 NamedDecl *D = F.next(); 971 972 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 973 continue; 974 975 if (ConsiderLinkage && 976 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 977 continue; 978 979 F.erase(); 980 } 981 982 F.done(); 983} 984 985static bool isUsingDecl(NamedDecl *D) { 986 return isa<UsingShadowDecl>(D) || 987 isa<UnresolvedUsingTypenameDecl>(D) || 988 isa<UnresolvedUsingValueDecl>(D); 989} 990 991/// Removes using shadow declarations from the lookup results. 992static void RemoveUsingDecls(LookupResult &R) { 993 LookupResult::Filter F = R.makeFilter(); 994 while (F.hasNext()) 995 if (isUsingDecl(F.next())) 996 F.erase(); 997 998 F.done(); 999} 1000 1001/// \brief Check for this common pattern: 1002/// @code 1003/// class S { 1004/// S(const S&); // DO NOT IMPLEMENT 1005/// void operator=(const S&); // DO NOT IMPLEMENT 1006/// }; 1007/// @endcode 1008static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1009 // FIXME: Should check for private access too but access is set after we get 1010 // the decl here. 1011 if (D->doesThisDeclarationHaveABody()) 1012 return false; 1013 1014 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1015 return CD->isCopyConstructor(); 1016 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1017 return Method->isCopyAssignmentOperator(); 1018 return false; 1019} 1020 1021bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1022 assert(D); 1023 1024 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1025 return false; 1026 1027 // Ignore class templates. 1028 if (D->getDeclContext()->isDependentContext() || 1029 D->getLexicalDeclContext()->isDependentContext()) 1030 return false; 1031 1032 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1033 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1034 return false; 1035 1036 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1037 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1038 return false; 1039 } else { 1040 // 'static inline' functions are used in headers; don't warn. 1041 if (FD->getStorageClass() == SC_Static && 1042 FD->isInlineSpecified()) 1043 return false; 1044 } 1045 1046 if (FD->doesThisDeclarationHaveABody() && 1047 Context.DeclMustBeEmitted(FD)) 1048 return false; 1049 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1050 if (!VD->isFileVarDecl() || 1051 VD->getType().isConstant(Context) || 1052 Context.DeclMustBeEmitted(VD)) 1053 return false; 1054 1055 if (VD->isStaticDataMember() && 1056 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1057 return false; 1058 1059 } else { 1060 return false; 1061 } 1062 1063 // Only warn for unused decls internal to the translation unit. 1064 if (D->getLinkage() == ExternalLinkage) 1065 return false; 1066 1067 return true; 1068} 1069 1070void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1071 if (!D) 1072 return; 1073 1074 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1075 const FunctionDecl *First = FD->getFirstDeclaration(); 1076 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1077 return; // First should already be in the vector. 1078 } 1079 1080 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1081 const VarDecl *First = VD->getFirstDeclaration(); 1082 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1083 return; // First should already be in the vector. 1084 } 1085 1086 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1087 UnusedFileScopedDecls.push_back(D); 1088 } 1089 1090static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1091 if (D->isInvalidDecl()) 1092 return false; 1093 1094 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1095 return false; 1096 1097 if (isa<LabelDecl>(D)) 1098 return true; 1099 1100 // White-list anything that isn't a local variable. 1101 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1102 !D->getDeclContext()->isFunctionOrMethod()) 1103 return false; 1104 1105 // Types of valid local variables should be complete, so this should succeed. 1106 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1107 1108 // White-list anything with an __attribute__((unused)) type. 1109 QualType Ty = VD->getType(); 1110 1111 // Only look at the outermost level of typedef. 1112 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1113 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1114 return false; 1115 } 1116 1117 // If we failed to complete the type for some reason, or if the type is 1118 // dependent, don't diagnose the variable. 1119 if (Ty->isIncompleteType() || Ty->isDependentType()) 1120 return false; 1121 1122 if (const TagType *TT = Ty->getAs<TagType>()) { 1123 const TagDecl *Tag = TT->getDecl(); 1124 if (Tag->hasAttr<UnusedAttr>()) 1125 return false; 1126 1127 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1128 // FIXME: Checking for the presence of a user-declared constructor 1129 // isn't completely accurate; we'd prefer to check that the initializer 1130 // has no side effects. 1131 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1132 return false; 1133 } 1134 } 1135 1136 // TODO: __attribute__((unused)) templates? 1137 } 1138 1139 return true; 1140} 1141 1142static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1143 FixItHint &Hint) { 1144 if (isa<LabelDecl>(D)) { 1145 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1146 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1147 if (AfterColon.isInvalid()) 1148 return; 1149 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1150 getCharRange(D->getLocStart(), AfterColon)); 1151 } 1152 return; 1153} 1154 1155/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1156/// unless they are marked attr(unused). 1157void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1158 FixItHint Hint; 1159 if (!ShouldDiagnoseUnusedDecl(D)) 1160 return; 1161 1162 GenerateFixForUnusedDecl(D, Context, Hint); 1163 1164 unsigned DiagID; 1165 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1166 DiagID = diag::warn_unused_exception_param; 1167 else if (isa<LabelDecl>(D)) 1168 DiagID = diag::warn_unused_label; 1169 else 1170 DiagID = diag::warn_unused_variable; 1171 1172 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1173} 1174 1175static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1176 // Verify that we have no forward references left. If so, there was a goto 1177 // or address of a label taken, but no definition of it. Label fwd 1178 // definitions are indicated with a null substmt. 1179 if (L->getStmt() == 0) 1180 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1181} 1182 1183void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1184 if (S->decl_empty()) return; 1185 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1186 "Scope shouldn't contain decls!"); 1187 1188 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1189 I != E; ++I) { 1190 Decl *TmpD = (*I); 1191 assert(TmpD && "This decl didn't get pushed??"); 1192 1193 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1194 NamedDecl *D = cast<NamedDecl>(TmpD); 1195 1196 if (!D->getDeclName()) continue; 1197 1198 // Diagnose unused variables in this scope. 1199 if (!S->hasErrorOccurred()) 1200 DiagnoseUnusedDecl(D); 1201 1202 // If this was a forward reference to a label, verify it was defined. 1203 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1204 CheckPoppedLabel(LD, *this); 1205 1206 // Remove this name from our lexical scope. 1207 IdResolver.RemoveDecl(D); 1208 } 1209} 1210 1211/// \brief Look for an Objective-C class in the translation unit. 1212/// 1213/// \param Id The name of the Objective-C class we're looking for. If 1214/// typo-correction fixes this name, the Id will be updated 1215/// to the fixed name. 1216/// 1217/// \param IdLoc The location of the name in the translation unit. 1218/// 1219/// \param TypoCorrection If true, this routine will attempt typo correction 1220/// if there is no class with the given name. 1221/// 1222/// \returns The declaration of the named Objective-C class, or NULL if the 1223/// class could not be found. 1224ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1225 SourceLocation IdLoc, 1226 bool DoTypoCorrection) { 1227 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1228 // creation from this context. 1229 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1230 1231 if (!IDecl && DoTypoCorrection) { 1232 // Perform typo correction at the given location, but only if we 1233 // find an Objective-C class name. 1234 TypoCorrection C; 1235 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1236 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1237 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1238 Diag(IdLoc, diag::err_undef_interface_suggest) 1239 << Id << IDecl->getDeclName() 1240 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1241 Diag(IDecl->getLocation(), diag::note_previous_decl) 1242 << IDecl->getDeclName(); 1243 1244 Id = IDecl->getIdentifier(); 1245 } 1246 } 1247 1248 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1249} 1250 1251/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1252/// from S, where a non-field would be declared. This routine copes 1253/// with the difference between C and C++ scoping rules in structs and 1254/// unions. For example, the following code is well-formed in C but 1255/// ill-formed in C++: 1256/// @code 1257/// struct S6 { 1258/// enum { BAR } e; 1259/// }; 1260/// 1261/// void test_S6() { 1262/// struct S6 a; 1263/// a.e = BAR; 1264/// } 1265/// @endcode 1266/// For the declaration of BAR, this routine will return a different 1267/// scope. The scope S will be the scope of the unnamed enumeration 1268/// within S6. In C++, this routine will return the scope associated 1269/// with S6, because the enumeration's scope is a transparent 1270/// context but structures can contain non-field names. In C, this 1271/// routine will return the translation unit scope, since the 1272/// enumeration's scope is a transparent context and structures cannot 1273/// contain non-field names. 1274Scope *Sema::getNonFieldDeclScope(Scope *S) { 1275 while (((S->getFlags() & Scope::DeclScope) == 0) || 1276 (S->getEntity() && 1277 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1278 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1279 S = S->getParent(); 1280 return S; 1281} 1282 1283/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1284/// file scope. lazily create a decl for it. ForRedeclaration is true 1285/// if we're creating this built-in in anticipation of redeclaring the 1286/// built-in. 1287NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1288 Scope *S, bool ForRedeclaration, 1289 SourceLocation Loc) { 1290 Builtin::ID BID = (Builtin::ID)bid; 1291 1292 ASTContext::GetBuiltinTypeError Error; 1293 QualType R = Context.GetBuiltinType(BID, Error); 1294 switch (Error) { 1295 case ASTContext::GE_None: 1296 // Okay 1297 break; 1298 1299 case ASTContext::GE_Missing_stdio: 1300 if (ForRedeclaration) 1301 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1302 << Context.BuiltinInfo.GetName(BID); 1303 return 0; 1304 1305 case ASTContext::GE_Missing_setjmp: 1306 if (ForRedeclaration) 1307 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1308 << Context.BuiltinInfo.GetName(BID); 1309 return 0; 1310 } 1311 1312 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1313 Diag(Loc, diag::ext_implicit_lib_function_decl) 1314 << Context.BuiltinInfo.GetName(BID) 1315 << R; 1316 if (Context.BuiltinInfo.getHeaderName(BID) && 1317 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1318 != DiagnosticsEngine::Ignored) 1319 Diag(Loc, diag::note_please_include_header) 1320 << Context.BuiltinInfo.getHeaderName(BID) 1321 << Context.BuiltinInfo.GetName(BID); 1322 } 1323 1324 FunctionDecl *New = FunctionDecl::Create(Context, 1325 Context.getTranslationUnitDecl(), 1326 Loc, Loc, II, R, /*TInfo=*/0, 1327 SC_Extern, 1328 SC_None, false, 1329 /*hasPrototype=*/true); 1330 New->setImplicit(); 1331 1332 // Create Decl objects for each parameter, adding them to the 1333 // FunctionDecl. 1334 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1335 SmallVector<ParmVarDecl*, 16> Params; 1336 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1337 ParmVarDecl *parm = 1338 ParmVarDecl::Create(Context, New, SourceLocation(), 1339 SourceLocation(), 0, 1340 FT->getArgType(i), /*TInfo=*/0, 1341 SC_None, SC_None, 0); 1342 parm->setScopeInfo(0, i); 1343 Params.push_back(parm); 1344 } 1345 New->setParams(Params); 1346 } 1347 1348 AddKnownFunctionAttributes(New); 1349 1350 // TUScope is the translation-unit scope to insert this function into. 1351 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1352 // relate Scopes to DeclContexts, and probably eliminate CurContext 1353 // entirely, but we're not there yet. 1354 DeclContext *SavedContext = CurContext; 1355 CurContext = Context.getTranslationUnitDecl(); 1356 PushOnScopeChains(New, TUScope); 1357 CurContext = SavedContext; 1358 return New; 1359} 1360 1361/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1362/// same name and scope as a previous declaration 'Old'. Figure out 1363/// how to resolve this situation, merging decls or emitting 1364/// diagnostics as appropriate. If there was an error, set New to be invalid. 1365/// 1366void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1367 // If the new decl is known invalid already, don't bother doing any 1368 // merging checks. 1369 if (New->isInvalidDecl()) return; 1370 1371 // Allow multiple definitions for ObjC built-in typedefs. 1372 // FIXME: Verify the underlying types are equivalent! 1373 if (getLangOptions().ObjC1) { 1374 const IdentifierInfo *TypeID = New->getIdentifier(); 1375 switch (TypeID->getLength()) { 1376 default: break; 1377 case 2: 1378 if (!TypeID->isStr("id")) 1379 break; 1380 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1381 // Install the built-in type for 'id', ignoring the current definition. 1382 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1383 return; 1384 case 5: 1385 if (!TypeID->isStr("Class")) 1386 break; 1387 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1388 // Install the built-in type for 'Class', ignoring the current definition. 1389 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1390 return; 1391 case 3: 1392 if (!TypeID->isStr("SEL")) 1393 break; 1394 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1395 // Install the built-in type for 'SEL', ignoring the current definition. 1396 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1397 return; 1398 } 1399 // Fall through - the typedef name was not a builtin type. 1400 } 1401 1402 // Verify the old decl was also a type. 1403 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1404 if (!Old) { 1405 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1406 << New->getDeclName(); 1407 1408 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1409 if (OldD->getLocation().isValid()) 1410 Diag(OldD->getLocation(), diag::note_previous_definition); 1411 1412 return New->setInvalidDecl(); 1413 } 1414 1415 // If the old declaration is invalid, just give up here. 1416 if (Old->isInvalidDecl()) 1417 return New->setInvalidDecl(); 1418 1419 // Determine the "old" type we'll use for checking and diagnostics. 1420 QualType OldType; 1421 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1422 OldType = OldTypedef->getUnderlyingType(); 1423 else 1424 OldType = Context.getTypeDeclType(Old); 1425 1426 // If the typedef types are not identical, reject them in all languages and 1427 // with any extensions enabled. 1428 1429 if (OldType != New->getUnderlyingType() && 1430 Context.getCanonicalType(OldType) != 1431 Context.getCanonicalType(New->getUnderlyingType())) { 1432 int Kind = 0; 1433 if (isa<TypeAliasDecl>(Old)) 1434 Kind = 1; 1435 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1436 << Kind << New->getUnderlyingType() << OldType; 1437 if (Old->getLocation().isValid()) 1438 Diag(Old->getLocation(), diag::note_previous_definition); 1439 return New->setInvalidDecl(); 1440 } 1441 1442 // The types match. Link up the redeclaration chain if the old 1443 // declaration was a typedef. 1444 // FIXME: this is a potential source of weirdness if the type 1445 // spellings don't match exactly. 1446 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1447 New->setPreviousDeclaration(Typedef); 1448 1449 // __module_private__ is propagated to later declarations. 1450 if (Old->isModulePrivate()) 1451 New->setModulePrivate(); 1452 else if (New->isModulePrivate()) 1453 diagnoseModulePrivateRedeclaration(New, Old); 1454 1455 if (getLangOptions().MicrosoftExt) 1456 return; 1457 1458 if (getLangOptions().CPlusPlus) { 1459 // C++ [dcl.typedef]p2: 1460 // In a given non-class scope, a typedef specifier can be used to 1461 // redefine the name of any type declared in that scope to refer 1462 // to the type to which it already refers. 1463 if (!isa<CXXRecordDecl>(CurContext)) 1464 return; 1465 1466 // C++0x [dcl.typedef]p4: 1467 // In a given class scope, a typedef specifier can be used to redefine 1468 // any class-name declared in that scope that is not also a typedef-name 1469 // to refer to the type to which it already refers. 1470 // 1471 // This wording came in via DR424, which was a correction to the 1472 // wording in DR56, which accidentally banned code like: 1473 // 1474 // struct S { 1475 // typedef struct A { } A; 1476 // }; 1477 // 1478 // in the C++03 standard. We implement the C++0x semantics, which 1479 // allow the above but disallow 1480 // 1481 // struct S { 1482 // typedef int I; 1483 // typedef int I; 1484 // }; 1485 // 1486 // since that was the intent of DR56. 1487 if (!isa<TypedefNameDecl>(Old)) 1488 return; 1489 1490 Diag(New->getLocation(), diag::err_redefinition) 1491 << New->getDeclName(); 1492 Diag(Old->getLocation(), diag::note_previous_definition); 1493 return New->setInvalidDecl(); 1494 } 1495 1496 // If we have a redefinition of a typedef in C, emit a warning. This warning 1497 // is normally mapped to an error, but can be controlled with 1498 // -Wtypedef-redefinition. If either the original or the redefinition is 1499 // in a system header, don't emit this for compatibility with GCC. 1500 if (getDiagnostics().getSuppressSystemWarnings() && 1501 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1502 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1503 return; 1504 1505 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1506 << New->getDeclName(); 1507 Diag(Old->getLocation(), diag::note_previous_definition); 1508 return; 1509} 1510 1511/// DeclhasAttr - returns true if decl Declaration already has the target 1512/// attribute. 1513static bool 1514DeclHasAttr(const Decl *D, const Attr *A) { 1515 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1516 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1517 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1518 if ((*i)->getKind() == A->getKind()) { 1519 if (Ann) { 1520 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1521 return true; 1522 continue; 1523 } 1524 // FIXME: Don't hardcode this check 1525 if (OA && isa<OwnershipAttr>(*i)) 1526 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1527 return true; 1528 } 1529 1530 return false; 1531} 1532 1533/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1534static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1535 ASTContext &C, bool mergeDeprecation = true) { 1536 if (!oldDecl->hasAttrs()) 1537 return; 1538 1539 bool foundAny = newDecl->hasAttrs(); 1540 1541 // Ensure that any moving of objects within the allocated map is done before 1542 // we process them. 1543 if (!foundAny) newDecl->setAttrs(AttrVec()); 1544 1545 for (specific_attr_iterator<InheritableAttr> 1546 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1547 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1548 // Ignore deprecated/unavailable/availability attributes if requested. 1549 if (!mergeDeprecation && 1550 (isa<DeprecatedAttr>(*i) || 1551 isa<UnavailableAttr>(*i) || 1552 isa<AvailabilityAttr>(*i))) 1553 continue; 1554 1555 if (!DeclHasAttr(newDecl, *i)) { 1556 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1557 newAttr->setInherited(true); 1558 newDecl->addAttr(newAttr); 1559 foundAny = true; 1560 } 1561 } 1562 1563 if (!foundAny) newDecl->dropAttrs(); 1564} 1565 1566/// mergeParamDeclAttributes - Copy attributes from the old parameter 1567/// to the new one. 1568static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1569 const ParmVarDecl *oldDecl, 1570 ASTContext &C) { 1571 if (!oldDecl->hasAttrs()) 1572 return; 1573 1574 bool foundAny = newDecl->hasAttrs(); 1575 1576 // Ensure that any moving of objects within the allocated map is 1577 // done before we process them. 1578 if (!foundAny) newDecl->setAttrs(AttrVec()); 1579 1580 for (specific_attr_iterator<InheritableParamAttr> 1581 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1582 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1583 if (!DeclHasAttr(newDecl, *i)) { 1584 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1585 newAttr->setInherited(true); 1586 newDecl->addAttr(newAttr); 1587 foundAny = true; 1588 } 1589 } 1590 1591 if (!foundAny) newDecl->dropAttrs(); 1592} 1593 1594namespace { 1595 1596/// Used in MergeFunctionDecl to keep track of function parameters in 1597/// C. 1598struct GNUCompatibleParamWarning { 1599 ParmVarDecl *OldParm; 1600 ParmVarDecl *NewParm; 1601 QualType PromotedType; 1602}; 1603 1604} 1605 1606/// getSpecialMember - get the special member enum for a method. 1607Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1608 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1609 if (Ctor->isDefaultConstructor()) 1610 return Sema::CXXDefaultConstructor; 1611 1612 if (Ctor->isCopyConstructor()) 1613 return Sema::CXXCopyConstructor; 1614 1615 if (Ctor->isMoveConstructor()) 1616 return Sema::CXXMoveConstructor; 1617 } else if (isa<CXXDestructorDecl>(MD)) { 1618 return Sema::CXXDestructor; 1619 } else if (MD->isCopyAssignmentOperator()) { 1620 return Sema::CXXCopyAssignment; 1621 } else if (MD->isMoveAssignmentOperator()) { 1622 return Sema::CXXMoveAssignment; 1623 } 1624 1625 return Sema::CXXInvalid; 1626} 1627 1628/// canRedefineFunction - checks if a function can be redefined. Currently, 1629/// only extern inline functions can be redefined, and even then only in 1630/// GNU89 mode. 1631static bool canRedefineFunction(const FunctionDecl *FD, 1632 const LangOptions& LangOpts) { 1633 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1634 !LangOpts.CPlusPlus && 1635 FD->isInlineSpecified() && 1636 FD->getStorageClass() == SC_Extern); 1637} 1638 1639/// MergeFunctionDecl - We just parsed a function 'New' from 1640/// declarator D which has the same name and scope as a previous 1641/// declaration 'Old'. Figure out how to resolve this situation, 1642/// merging decls or emitting diagnostics as appropriate. 1643/// 1644/// In C++, New and Old must be declarations that are not 1645/// overloaded. Use IsOverload to determine whether New and Old are 1646/// overloaded, and to select the Old declaration that New should be 1647/// merged with. 1648/// 1649/// Returns true if there was an error, false otherwise. 1650bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1651 // Verify the old decl was also a function. 1652 FunctionDecl *Old = 0; 1653 if (FunctionTemplateDecl *OldFunctionTemplate 1654 = dyn_cast<FunctionTemplateDecl>(OldD)) 1655 Old = OldFunctionTemplate->getTemplatedDecl(); 1656 else 1657 Old = dyn_cast<FunctionDecl>(OldD); 1658 if (!Old) { 1659 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1660 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1661 Diag(Shadow->getTargetDecl()->getLocation(), 1662 diag::note_using_decl_target); 1663 Diag(Shadow->getUsingDecl()->getLocation(), 1664 diag::note_using_decl) << 0; 1665 return true; 1666 } 1667 1668 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1669 << New->getDeclName(); 1670 Diag(OldD->getLocation(), diag::note_previous_definition); 1671 return true; 1672 } 1673 1674 // Determine whether the previous declaration was a definition, 1675 // implicit declaration, or a declaration. 1676 diag::kind PrevDiag; 1677 if (Old->isThisDeclarationADefinition()) 1678 PrevDiag = diag::note_previous_definition; 1679 else if (Old->isImplicit()) 1680 PrevDiag = diag::note_previous_implicit_declaration; 1681 else 1682 PrevDiag = diag::note_previous_declaration; 1683 1684 QualType OldQType = Context.getCanonicalType(Old->getType()); 1685 QualType NewQType = Context.getCanonicalType(New->getType()); 1686 1687 // Don't complain about this if we're in GNU89 mode and the old function 1688 // is an extern inline function. 1689 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1690 New->getStorageClass() == SC_Static && 1691 Old->getStorageClass() != SC_Static && 1692 !canRedefineFunction(Old, getLangOptions())) { 1693 if (getLangOptions().MicrosoftExt) { 1694 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1695 Diag(Old->getLocation(), PrevDiag); 1696 } else { 1697 Diag(New->getLocation(), diag::err_static_non_static) << New; 1698 Diag(Old->getLocation(), PrevDiag); 1699 return true; 1700 } 1701 } 1702 1703 // If a function is first declared with a calling convention, but is 1704 // later declared or defined without one, the second decl assumes the 1705 // calling convention of the first. 1706 // 1707 // For the new decl, we have to look at the NON-canonical type to tell the 1708 // difference between a function that really doesn't have a calling 1709 // convention and one that is declared cdecl. That's because in 1710 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1711 // because it is the default calling convention. 1712 // 1713 // Note also that we DO NOT return at this point, because we still have 1714 // other tests to run. 1715 const FunctionType *OldType = cast<FunctionType>(OldQType); 1716 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1717 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1718 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1719 bool RequiresAdjustment = false; 1720 if (OldTypeInfo.getCC() != CC_Default && 1721 NewTypeInfo.getCC() == CC_Default) { 1722 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1723 RequiresAdjustment = true; 1724 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1725 NewTypeInfo.getCC())) { 1726 // Calling conventions really aren't compatible, so complain. 1727 Diag(New->getLocation(), diag::err_cconv_change) 1728 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1729 << (OldTypeInfo.getCC() == CC_Default) 1730 << (OldTypeInfo.getCC() == CC_Default ? "" : 1731 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1732 Diag(Old->getLocation(), diag::note_previous_declaration); 1733 return true; 1734 } 1735 1736 // FIXME: diagnose the other way around? 1737 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1738 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1739 RequiresAdjustment = true; 1740 } 1741 1742 // Merge regparm attribute. 1743 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1744 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1745 if (NewTypeInfo.getHasRegParm()) { 1746 Diag(New->getLocation(), diag::err_regparm_mismatch) 1747 << NewType->getRegParmType() 1748 << OldType->getRegParmType(); 1749 Diag(Old->getLocation(), diag::note_previous_declaration); 1750 return true; 1751 } 1752 1753 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1754 RequiresAdjustment = true; 1755 } 1756 1757 // Merge ns_returns_retained attribute. 1758 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1759 if (NewTypeInfo.getProducesResult()) { 1760 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1761 Diag(Old->getLocation(), diag::note_previous_declaration); 1762 return true; 1763 } 1764 1765 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1766 RequiresAdjustment = true; 1767 } 1768 1769 if (RequiresAdjustment) { 1770 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1771 New->setType(QualType(NewType, 0)); 1772 NewQType = Context.getCanonicalType(New->getType()); 1773 } 1774 1775 if (getLangOptions().CPlusPlus) { 1776 // (C++98 13.1p2): 1777 // Certain function declarations cannot be overloaded: 1778 // -- Function declarations that differ only in the return type 1779 // cannot be overloaded. 1780 QualType OldReturnType = OldType->getResultType(); 1781 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1782 QualType ResQT; 1783 if (OldReturnType != NewReturnType) { 1784 if (NewReturnType->isObjCObjectPointerType() 1785 && OldReturnType->isObjCObjectPointerType()) 1786 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1787 if (ResQT.isNull()) { 1788 if (New->isCXXClassMember() && New->isOutOfLine()) 1789 Diag(New->getLocation(), 1790 diag::err_member_def_does_not_match_ret_type) << New; 1791 else 1792 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1793 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1794 return true; 1795 } 1796 else 1797 NewQType = ResQT; 1798 } 1799 1800 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1801 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1802 if (OldMethod && NewMethod) { 1803 // Preserve triviality. 1804 NewMethod->setTrivial(OldMethod->isTrivial()); 1805 1806 // MSVC allows explicit template specialization at class scope: 1807 // 2 CXMethodDecls referring to the same function will be injected. 1808 // We don't want a redeclartion error. 1809 bool IsClassScopeExplicitSpecialization = 1810 OldMethod->isFunctionTemplateSpecialization() && 1811 NewMethod->isFunctionTemplateSpecialization(); 1812 bool isFriend = NewMethod->getFriendObjectKind(); 1813 1814 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1815 !IsClassScopeExplicitSpecialization) { 1816 // -- Member function declarations with the same name and the 1817 // same parameter types cannot be overloaded if any of them 1818 // is a static member function declaration. 1819 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1820 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1821 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1822 return true; 1823 } 1824 1825 // C++ [class.mem]p1: 1826 // [...] A member shall not be declared twice in the 1827 // member-specification, except that a nested class or member 1828 // class template can be declared and then later defined. 1829 unsigned NewDiag; 1830 if (isa<CXXConstructorDecl>(OldMethod)) 1831 NewDiag = diag::err_constructor_redeclared; 1832 else if (isa<CXXDestructorDecl>(NewMethod)) 1833 NewDiag = diag::err_destructor_redeclared; 1834 else if (isa<CXXConversionDecl>(NewMethod)) 1835 NewDiag = diag::err_conv_function_redeclared; 1836 else 1837 NewDiag = diag::err_member_redeclared; 1838 1839 Diag(New->getLocation(), NewDiag); 1840 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1841 1842 // Complain if this is an explicit declaration of a special 1843 // member that was initially declared implicitly. 1844 // 1845 // As an exception, it's okay to befriend such methods in order 1846 // to permit the implicit constructor/destructor/operator calls. 1847 } else if (OldMethod->isImplicit()) { 1848 if (isFriend) { 1849 NewMethod->setImplicit(); 1850 } else { 1851 Diag(NewMethod->getLocation(), 1852 diag::err_definition_of_implicitly_declared_member) 1853 << New << getSpecialMember(OldMethod); 1854 return true; 1855 } 1856 } else if (OldMethod->isExplicitlyDefaulted()) { 1857 Diag(NewMethod->getLocation(), 1858 diag::err_definition_of_explicitly_defaulted_member) 1859 << getSpecialMember(OldMethod); 1860 return true; 1861 } 1862 } 1863 1864 // (C++98 8.3.5p3): 1865 // All declarations for a function shall agree exactly in both the 1866 // return type and the parameter-type-list. 1867 // We also want to respect all the extended bits except noreturn. 1868 1869 // noreturn should now match unless the old type info didn't have it. 1870 QualType OldQTypeForComparison = OldQType; 1871 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1872 assert(OldQType == QualType(OldType, 0)); 1873 const FunctionType *OldTypeForComparison 1874 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1875 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1876 assert(OldQTypeForComparison.isCanonical()); 1877 } 1878 1879 if (OldQTypeForComparison == NewQType) 1880 return MergeCompatibleFunctionDecls(New, Old); 1881 1882 // Fall through for conflicting redeclarations and redefinitions. 1883 } 1884 1885 // C: Function types need to be compatible, not identical. This handles 1886 // duplicate function decls like "void f(int); void f(enum X);" properly. 1887 if (!getLangOptions().CPlusPlus && 1888 Context.typesAreCompatible(OldQType, NewQType)) { 1889 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1890 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1891 const FunctionProtoType *OldProto = 0; 1892 if (isa<FunctionNoProtoType>(NewFuncType) && 1893 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1894 // The old declaration provided a function prototype, but the 1895 // new declaration does not. Merge in the prototype. 1896 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1897 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1898 OldProto->arg_type_end()); 1899 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1900 ParamTypes.data(), ParamTypes.size(), 1901 OldProto->getExtProtoInfo()); 1902 New->setType(NewQType); 1903 New->setHasInheritedPrototype(); 1904 1905 // Synthesize a parameter for each argument type. 1906 SmallVector<ParmVarDecl*, 16> Params; 1907 for (FunctionProtoType::arg_type_iterator 1908 ParamType = OldProto->arg_type_begin(), 1909 ParamEnd = OldProto->arg_type_end(); 1910 ParamType != ParamEnd; ++ParamType) { 1911 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1912 SourceLocation(), 1913 SourceLocation(), 0, 1914 *ParamType, /*TInfo=*/0, 1915 SC_None, SC_None, 1916 0); 1917 Param->setScopeInfo(0, Params.size()); 1918 Param->setImplicit(); 1919 Params.push_back(Param); 1920 } 1921 1922 New->setParams(Params); 1923 } 1924 1925 return MergeCompatibleFunctionDecls(New, Old); 1926 } 1927 1928 // GNU C permits a K&R definition to follow a prototype declaration 1929 // if the declared types of the parameters in the K&R definition 1930 // match the types in the prototype declaration, even when the 1931 // promoted types of the parameters from the K&R definition differ 1932 // from the types in the prototype. GCC then keeps the types from 1933 // the prototype. 1934 // 1935 // If a variadic prototype is followed by a non-variadic K&R definition, 1936 // the K&R definition becomes variadic. This is sort of an edge case, but 1937 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1938 // C99 6.9.1p8. 1939 if (!getLangOptions().CPlusPlus && 1940 Old->hasPrototype() && !New->hasPrototype() && 1941 New->getType()->getAs<FunctionProtoType>() && 1942 Old->getNumParams() == New->getNumParams()) { 1943 SmallVector<QualType, 16> ArgTypes; 1944 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1945 const FunctionProtoType *OldProto 1946 = Old->getType()->getAs<FunctionProtoType>(); 1947 const FunctionProtoType *NewProto 1948 = New->getType()->getAs<FunctionProtoType>(); 1949 1950 // Determine whether this is the GNU C extension. 1951 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1952 NewProto->getResultType()); 1953 bool LooseCompatible = !MergedReturn.isNull(); 1954 for (unsigned Idx = 0, End = Old->getNumParams(); 1955 LooseCompatible && Idx != End; ++Idx) { 1956 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1957 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1958 if (Context.typesAreCompatible(OldParm->getType(), 1959 NewProto->getArgType(Idx))) { 1960 ArgTypes.push_back(NewParm->getType()); 1961 } else if (Context.typesAreCompatible(OldParm->getType(), 1962 NewParm->getType(), 1963 /*CompareUnqualified=*/true)) { 1964 GNUCompatibleParamWarning Warn 1965 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1966 Warnings.push_back(Warn); 1967 ArgTypes.push_back(NewParm->getType()); 1968 } else 1969 LooseCompatible = false; 1970 } 1971 1972 if (LooseCompatible) { 1973 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1974 Diag(Warnings[Warn].NewParm->getLocation(), 1975 diag::ext_param_promoted_not_compatible_with_prototype) 1976 << Warnings[Warn].PromotedType 1977 << Warnings[Warn].OldParm->getType(); 1978 if (Warnings[Warn].OldParm->getLocation().isValid()) 1979 Diag(Warnings[Warn].OldParm->getLocation(), 1980 diag::note_previous_declaration); 1981 } 1982 1983 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1984 ArgTypes.size(), 1985 OldProto->getExtProtoInfo())); 1986 return MergeCompatibleFunctionDecls(New, Old); 1987 } 1988 1989 // Fall through to diagnose conflicting types. 1990 } 1991 1992 // A function that has already been declared has been redeclared or defined 1993 // with a different type- show appropriate diagnostic 1994 if (unsigned BuiltinID = Old->getBuiltinID()) { 1995 // The user has declared a builtin function with an incompatible 1996 // signature. 1997 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1998 // The function the user is redeclaring is a library-defined 1999 // function like 'malloc' or 'printf'. Warn about the 2000 // redeclaration, then pretend that we don't know about this 2001 // library built-in. 2002 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2003 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2004 << Old << Old->getType(); 2005 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2006 Old->setInvalidDecl(); 2007 return false; 2008 } 2009 2010 PrevDiag = diag::note_previous_builtin_declaration; 2011 } 2012 2013 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2014 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2015 return true; 2016} 2017 2018/// \brief Completes the merge of two function declarations that are 2019/// known to be compatible. 2020/// 2021/// This routine handles the merging of attributes and other 2022/// properties of function declarations form the old declaration to 2023/// the new declaration, once we know that New is in fact a 2024/// redeclaration of Old. 2025/// 2026/// \returns false 2027bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2028 // Merge the attributes 2029 mergeDeclAttributes(New, Old, Context); 2030 2031 // Merge the storage class. 2032 if (Old->getStorageClass() != SC_Extern && 2033 Old->getStorageClass() != SC_None) 2034 New->setStorageClass(Old->getStorageClass()); 2035 2036 // Merge "pure" flag. 2037 if (Old->isPure()) 2038 New->setPure(); 2039 2040 // __module_private__ is propagated to later declarations. 2041 if (Old->isModulePrivate()) 2042 New->setModulePrivate(); 2043 else if (New->isModulePrivate()) 2044 diagnoseModulePrivateRedeclaration(New, Old); 2045 2046 // Merge attributes from the parameters. These can mismatch with K&R 2047 // declarations. 2048 if (New->getNumParams() == Old->getNumParams()) 2049 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2050 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2051 Context); 2052 2053 if (getLangOptions().CPlusPlus) 2054 return MergeCXXFunctionDecl(New, Old); 2055 2056 return false; 2057} 2058 2059 2060void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2061 const ObjCMethodDecl *oldMethod) { 2062 // We don't want to merge unavailable and deprecated attributes 2063 // except from interface to implementation. 2064 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2065 2066 // Merge the attributes. 2067 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2068 2069 // Merge attributes from the parameters. 2070 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2071 for (ObjCMethodDecl::param_iterator 2072 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2073 ni != ne; ++ni, ++oi) 2074 mergeParamDeclAttributes(*ni, *oi, Context); 2075 2076 CheckObjCMethodOverride(newMethod, oldMethod, true); 2077} 2078 2079/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2080/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2081/// emitting diagnostics as appropriate. 2082/// 2083/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2084/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2085/// check them before the initializer is attached. 2086/// 2087void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2088 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2089 return; 2090 2091 QualType MergedT; 2092 if (getLangOptions().CPlusPlus) { 2093 AutoType *AT = New->getType()->getContainedAutoType(); 2094 if (AT && !AT->isDeduced()) { 2095 // We don't know what the new type is until the initializer is attached. 2096 return; 2097 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2098 // These could still be something that needs exception specs checked. 2099 return MergeVarDeclExceptionSpecs(New, Old); 2100 } 2101 // C++ [basic.link]p10: 2102 // [...] the types specified by all declarations referring to a given 2103 // object or function shall be identical, except that declarations for an 2104 // array object can specify array types that differ by the presence or 2105 // absence of a major array bound (8.3.4). 2106 else if (Old->getType()->isIncompleteArrayType() && 2107 New->getType()->isArrayType()) { 2108 CanQual<ArrayType> OldArray 2109 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2110 CanQual<ArrayType> NewArray 2111 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2112 if (OldArray->getElementType() == NewArray->getElementType()) 2113 MergedT = New->getType(); 2114 } else if (Old->getType()->isArrayType() && 2115 New->getType()->isIncompleteArrayType()) { 2116 CanQual<ArrayType> OldArray 2117 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2118 CanQual<ArrayType> NewArray 2119 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2120 if (OldArray->getElementType() == NewArray->getElementType()) 2121 MergedT = Old->getType(); 2122 } else if (New->getType()->isObjCObjectPointerType() 2123 && Old->getType()->isObjCObjectPointerType()) { 2124 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2125 Old->getType()); 2126 } 2127 } else { 2128 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2129 } 2130 if (MergedT.isNull()) { 2131 Diag(New->getLocation(), diag::err_redefinition_different_type) 2132 << New->getDeclName(); 2133 Diag(Old->getLocation(), diag::note_previous_definition); 2134 return New->setInvalidDecl(); 2135 } 2136 New->setType(MergedT); 2137} 2138 2139/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2140/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2141/// situation, merging decls or emitting diagnostics as appropriate. 2142/// 2143/// Tentative definition rules (C99 6.9.2p2) are checked by 2144/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2145/// definitions here, since the initializer hasn't been attached. 2146/// 2147void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2148 // If the new decl is already invalid, don't do any other checking. 2149 if (New->isInvalidDecl()) 2150 return; 2151 2152 // Verify the old decl was also a variable. 2153 VarDecl *Old = 0; 2154 if (!Previous.isSingleResult() || 2155 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2156 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2157 << New->getDeclName(); 2158 Diag(Previous.getRepresentativeDecl()->getLocation(), 2159 diag::note_previous_definition); 2160 return New->setInvalidDecl(); 2161 } 2162 2163 // C++ [class.mem]p1: 2164 // A member shall not be declared twice in the member-specification [...] 2165 // 2166 // Here, we need only consider static data members. 2167 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2168 Diag(New->getLocation(), diag::err_duplicate_member) 2169 << New->getIdentifier(); 2170 Diag(Old->getLocation(), diag::note_previous_declaration); 2171 New->setInvalidDecl(); 2172 } 2173 2174 mergeDeclAttributes(New, Old, Context); 2175 // Warn if an already-declared variable is made a weak_import in a subsequent 2176 // declaration 2177 if (New->getAttr<WeakImportAttr>() && 2178 Old->getStorageClass() == SC_None && 2179 !Old->getAttr<WeakImportAttr>()) { 2180 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2181 Diag(Old->getLocation(), diag::note_previous_definition); 2182 // Remove weak_import attribute on new declaration. 2183 New->dropAttr<WeakImportAttr>(); 2184 } 2185 2186 // Merge the types. 2187 MergeVarDeclTypes(New, Old); 2188 if (New->isInvalidDecl()) 2189 return; 2190 2191 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2192 if (New->getStorageClass() == SC_Static && 2193 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2194 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2195 Diag(Old->getLocation(), diag::note_previous_definition); 2196 return New->setInvalidDecl(); 2197 } 2198 // C99 6.2.2p4: 2199 // For an identifier declared with the storage-class specifier 2200 // extern in a scope in which a prior declaration of that 2201 // identifier is visible,23) if the prior declaration specifies 2202 // internal or external linkage, the linkage of the identifier at 2203 // the later declaration is the same as the linkage specified at 2204 // the prior declaration. If no prior declaration is visible, or 2205 // if the prior declaration specifies no linkage, then the 2206 // identifier has external linkage. 2207 if (New->hasExternalStorage() && Old->hasLinkage()) 2208 /* Okay */; 2209 else if (New->getStorageClass() != SC_Static && 2210 Old->getStorageClass() == SC_Static) { 2211 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2212 Diag(Old->getLocation(), diag::note_previous_definition); 2213 return New->setInvalidDecl(); 2214 } 2215 2216 // Check if extern is followed by non-extern and vice-versa. 2217 if (New->hasExternalStorage() && 2218 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2219 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2220 Diag(Old->getLocation(), diag::note_previous_definition); 2221 return New->setInvalidDecl(); 2222 } 2223 if (Old->hasExternalStorage() && 2224 !New->hasLinkage() && New->isLocalVarDecl()) { 2225 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2226 Diag(Old->getLocation(), diag::note_previous_definition); 2227 return New->setInvalidDecl(); 2228 } 2229 2230 // __module_private__ is propagated to later declarations. 2231 if (Old->isModulePrivate()) 2232 New->setModulePrivate(); 2233 else if (New->isModulePrivate()) 2234 diagnoseModulePrivateRedeclaration(New, Old); 2235 2236 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2237 2238 // FIXME: The test for external storage here seems wrong? We still 2239 // need to check for mismatches. 2240 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2241 // Don't complain about out-of-line definitions of static members. 2242 !(Old->getLexicalDeclContext()->isRecord() && 2243 !New->getLexicalDeclContext()->isRecord())) { 2244 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2245 Diag(Old->getLocation(), diag::note_previous_definition); 2246 return New->setInvalidDecl(); 2247 } 2248 2249 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2250 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2251 Diag(Old->getLocation(), diag::note_previous_definition); 2252 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2253 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2254 Diag(Old->getLocation(), diag::note_previous_definition); 2255 } 2256 2257 // C++ doesn't have tentative definitions, so go right ahead and check here. 2258 const VarDecl *Def; 2259 if (getLangOptions().CPlusPlus && 2260 New->isThisDeclarationADefinition() == VarDecl::Definition && 2261 (Def = Old->getDefinition())) { 2262 Diag(New->getLocation(), diag::err_redefinition) 2263 << New->getDeclName(); 2264 Diag(Def->getLocation(), diag::note_previous_definition); 2265 New->setInvalidDecl(); 2266 return; 2267 } 2268 // c99 6.2.2 P4. 2269 // For an identifier declared with the storage-class specifier extern in a 2270 // scope in which a prior declaration of that identifier is visible, if 2271 // the prior declaration specifies internal or external linkage, the linkage 2272 // of the identifier at the later declaration is the same as the linkage 2273 // specified at the prior declaration. 2274 // FIXME. revisit this code. 2275 if (New->hasExternalStorage() && 2276 Old->getLinkage() == InternalLinkage && 2277 New->getDeclContext() == Old->getDeclContext()) 2278 New->setStorageClass(Old->getStorageClass()); 2279 2280 // Keep a chain of previous declarations. 2281 New->setPreviousDeclaration(Old); 2282 2283 // Inherit access appropriately. 2284 New->setAccess(Old->getAccess()); 2285} 2286 2287/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2288/// no declarator (e.g. "struct foo;") is parsed. 2289Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2290 DeclSpec &DS) { 2291 return ParsedFreeStandingDeclSpec(S, AS, DS, 2292 MultiTemplateParamsArg(*this, 0, 0)); 2293} 2294 2295/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2296/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2297/// parameters to cope with template friend declarations. 2298Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2299 DeclSpec &DS, 2300 MultiTemplateParamsArg TemplateParams) { 2301 Decl *TagD = 0; 2302 TagDecl *Tag = 0; 2303 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2304 DS.getTypeSpecType() == DeclSpec::TST_struct || 2305 DS.getTypeSpecType() == DeclSpec::TST_union || 2306 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2307 TagD = DS.getRepAsDecl(); 2308 2309 if (!TagD) // We probably had an error 2310 return 0; 2311 2312 // Note that the above type specs guarantee that the 2313 // type rep is a Decl, whereas in many of the others 2314 // it's a Type. 2315 Tag = dyn_cast<TagDecl>(TagD); 2316 } 2317 2318 if (Tag) 2319 Tag->setFreeStanding(); 2320 2321 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2322 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2323 // or incomplete types shall not be restrict-qualified." 2324 if (TypeQuals & DeclSpec::TQ_restrict) 2325 Diag(DS.getRestrictSpecLoc(), 2326 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2327 << DS.getSourceRange(); 2328 } 2329 2330 if (DS.isConstexprSpecified()) { 2331 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2332 // and definitions of functions and variables. 2333 if (Tag) 2334 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2335 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2336 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2337 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2338 else 2339 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2340 // Don't emit warnings after this error. 2341 return TagD; 2342 } 2343 2344 if (DS.isFriendSpecified()) { 2345 // If we're dealing with a decl but not a TagDecl, assume that 2346 // whatever routines created it handled the friendship aspect. 2347 if (TagD && !Tag) 2348 return 0; 2349 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2350 } 2351 2352 // Track whether we warned about the fact that there aren't any 2353 // declarators. 2354 bool emittedWarning = false; 2355 2356 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2357 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2358 2359 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2360 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2361 if (getLangOptions().CPlusPlus || 2362 Record->getDeclContext()->isRecord()) 2363 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2364 2365 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2366 << DS.getSourceRange(); 2367 emittedWarning = true; 2368 } 2369 } 2370 2371 // Check for Microsoft C extension: anonymous struct. 2372 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2373 CurContext->isRecord() && 2374 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2375 // Handle 2 kinds of anonymous struct: 2376 // struct STRUCT; 2377 // and 2378 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2379 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2380 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2381 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2382 DS.getRepAsType().get()->isStructureType())) { 2383 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2384 << DS.getSourceRange(); 2385 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2386 } 2387 } 2388 2389 if (getLangOptions().CPlusPlus && 2390 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2391 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2392 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2393 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2394 Diag(Enum->getLocation(), diag::ext_no_declarators) 2395 << DS.getSourceRange(); 2396 emittedWarning = true; 2397 } 2398 2399 // Skip all the checks below if we have a type error. 2400 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2401 2402 if (!DS.isMissingDeclaratorOk()) { 2403 // Warn about typedefs of enums without names, since this is an 2404 // extension in both Microsoft and GNU. 2405 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2406 Tag && isa<EnumDecl>(Tag)) { 2407 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2408 << DS.getSourceRange(); 2409 return Tag; 2410 } 2411 2412 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2413 << DS.getSourceRange(); 2414 emittedWarning = true; 2415 } 2416 2417 // We're going to complain about a bunch of spurious specifiers; 2418 // only do this if we're declaring a tag, because otherwise we 2419 // should be getting diag::ext_no_declarators. 2420 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2421 return TagD; 2422 2423 // Note that a linkage-specification sets a storage class, but 2424 // 'extern "C" struct foo;' is actually valid and not theoretically 2425 // useless. 2426 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2427 if (!DS.isExternInLinkageSpec()) 2428 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2429 << DeclSpec::getSpecifierName(scs); 2430 2431 if (DS.isThreadSpecified()) 2432 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2433 if (DS.getTypeQualifiers()) { 2434 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2435 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2436 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2437 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2438 // Restrict is covered above. 2439 } 2440 if (DS.isInlineSpecified()) 2441 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2442 if (DS.isVirtualSpecified()) 2443 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2444 if (DS.isExplicitSpecified()) 2445 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2446 2447 if (DS.isModulePrivateSpecified() && 2448 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2449 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2450 << Tag->getTagKind() 2451 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2452 2453 // FIXME: Warn on useless attributes 2454 2455 return TagD; 2456} 2457 2458/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2459/// builds a statement for it and returns it so it is evaluated. 2460StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2461 StmtResult R; 2462 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2463 Expr *Exp = DS.getRepAsExpr(); 2464 QualType Ty = Exp->getType(); 2465 if (Ty->isPointerType()) { 2466 do 2467 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2468 while (Ty->isPointerType()); 2469 } 2470 if (Ty->isVariableArrayType()) { 2471 R = ActOnExprStmt(MakeFullExpr(Exp)); 2472 } 2473 } 2474 return R; 2475} 2476 2477/// We are trying to inject an anonymous member into the given scope; 2478/// check if there's an existing declaration that can't be overloaded. 2479/// 2480/// \return true if this is a forbidden redeclaration 2481static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2482 Scope *S, 2483 DeclContext *Owner, 2484 DeclarationName Name, 2485 SourceLocation NameLoc, 2486 unsigned diagnostic) { 2487 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2488 Sema::ForRedeclaration); 2489 if (!SemaRef.LookupName(R, S)) return false; 2490 2491 if (R.getAsSingle<TagDecl>()) 2492 return false; 2493 2494 // Pick a representative declaration. 2495 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2496 assert(PrevDecl && "Expected a non-null Decl"); 2497 2498 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2499 return false; 2500 2501 SemaRef.Diag(NameLoc, diagnostic) << Name; 2502 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2503 2504 return true; 2505} 2506 2507/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2508/// anonymous struct or union AnonRecord into the owning context Owner 2509/// and scope S. This routine will be invoked just after we realize 2510/// that an unnamed union or struct is actually an anonymous union or 2511/// struct, e.g., 2512/// 2513/// @code 2514/// union { 2515/// int i; 2516/// float f; 2517/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2518/// // f into the surrounding scope.x 2519/// @endcode 2520/// 2521/// This routine is recursive, injecting the names of nested anonymous 2522/// structs/unions into the owning context and scope as well. 2523static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2524 DeclContext *Owner, 2525 RecordDecl *AnonRecord, 2526 AccessSpecifier AS, 2527 SmallVector<NamedDecl*, 2> &Chaining, 2528 bool MSAnonStruct) { 2529 unsigned diagKind 2530 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2531 : diag::err_anonymous_struct_member_redecl; 2532 2533 bool Invalid = false; 2534 2535 // Look every FieldDecl and IndirectFieldDecl with a name. 2536 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2537 DEnd = AnonRecord->decls_end(); 2538 D != DEnd; ++D) { 2539 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2540 cast<NamedDecl>(*D)->getDeclName()) { 2541 ValueDecl *VD = cast<ValueDecl>(*D); 2542 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2543 VD->getLocation(), diagKind)) { 2544 // C++ [class.union]p2: 2545 // The names of the members of an anonymous union shall be 2546 // distinct from the names of any other entity in the 2547 // scope in which the anonymous union is declared. 2548 Invalid = true; 2549 } else { 2550 // C++ [class.union]p2: 2551 // For the purpose of name lookup, after the anonymous union 2552 // definition, the members of the anonymous union are 2553 // considered to have been defined in the scope in which the 2554 // anonymous union is declared. 2555 unsigned OldChainingSize = Chaining.size(); 2556 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2557 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2558 PE = IF->chain_end(); PI != PE; ++PI) 2559 Chaining.push_back(*PI); 2560 else 2561 Chaining.push_back(VD); 2562 2563 assert(Chaining.size() >= 2); 2564 NamedDecl **NamedChain = 2565 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2566 for (unsigned i = 0; i < Chaining.size(); i++) 2567 NamedChain[i] = Chaining[i]; 2568 2569 IndirectFieldDecl* IndirectField = 2570 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2571 VD->getIdentifier(), VD->getType(), 2572 NamedChain, Chaining.size()); 2573 2574 IndirectField->setAccess(AS); 2575 IndirectField->setImplicit(); 2576 SemaRef.PushOnScopeChains(IndirectField, S); 2577 2578 // That includes picking up the appropriate access specifier. 2579 if (AS != AS_none) IndirectField->setAccess(AS); 2580 2581 Chaining.resize(OldChainingSize); 2582 } 2583 } 2584 } 2585 2586 return Invalid; 2587} 2588 2589/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2590/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2591/// illegal input values are mapped to SC_None. 2592static StorageClass 2593StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2594 switch (StorageClassSpec) { 2595 case DeclSpec::SCS_unspecified: return SC_None; 2596 case DeclSpec::SCS_extern: return SC_Extern; 2597 case DeclSpec::SCS_static: return SC_Static; 2598 case DeclSpec::SCS_auto: return SC_Auto; 2599 case DeclSpec::SCS_register: return SC_Register; 2600 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2601 // Illegal SCSs map to None: error reporting is up to the caller. 2602 case DeclSpec::SCS_mutable: // Fall through. 2603 case DeclSpec::SCS_typedef: return SC_None; 2604 } 2605 llvm_unreachable("unknown storage class specifier"); 2606} 2607 2608/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2609/// a StorageClass. Any error reporting is up to the caller: 2610/// illegal input values are mapped to SC_None. 2611static StorageClass 2612StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2613 switch (StorageClassSpec) { 2614 case DeclSpec::SCS_unspecified: return SC_None; 2615 case DeclSpec::SCS_extern: return SC_Extern; 2616 case DeclSpec::SCS_static: return SC_Static; 2617 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2618 // Illegal SCSs map to None: error reporting is up to the caller. 2619 case DeclSpec::SCS_auto: // Fall through. 2620 case DeclSpec::SCS_mutable: // Fall through. 2621 case DeclSpec::SCS_register: // Fall through. 2622 case DeclSpec::SCS_typedef: return SC_None; 2623 } 2624 llvm_unreachable("unknown storage class specifier"); 2625} 2626 2627/// BuildAnonymousStructOrUnion - Handle the declaration of an 2628/// anonymous structure or union. Anonymous unions are a C++ feature 2629/// (C++ [class.union]) and a GNU C extension; anonymous structures 2630/// are a GNU C and GNU C++ extension. 2631Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2632 AccessSpecifier AS, 2633 RecordDecl *Record) { 2634 DeclContext *Owner = Record->getDeclContext(); 2635 2636 // Diagnose whether this anonymous struct/union is an extension. 2637 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2638 Diag(Record->getLocation(), diag::ext_anonymous_union); 2639 else if (!Record->isUnion()) 2640 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2641 2642 // C and C++ require different kinds of checks for anonymous 2643 // structs/unions. 2644 bool Invalid = false; 2645 if (getLangOptions().CPlusPlus) { 2646 const char* PrevSpec = 0; 2647 unsigned DiagID; 2648 if (Record->isUnion()) { 2649 // C++ [class.union]p6: 2650 // Anonymous unions declared in a named namespace or in the 2651 // global namespace shall be declared static. 2652 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2653 (isa<TranslationUnitDecl>(Owner) || 2654 (isa<NamespaceDecl>(Owner) && 2655 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2656 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2657 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2658 2659 // Recover by adding 'static'. 2660 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2661 PrevSpec, DiagID); 2662 } 2663 // C++ [class.union]p6: 2664 // A storage class is not allowed in a declaration of an 2665 // anonymous union in a class scope. 2666 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2667 isa<RecordDecl>(Owner)) { 2668 Diag(DS.getStorageClassSpecLoc(), 2669 diag::err_anonymous_union_with_storage_spec) 2670 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2671 2672 // Recover by removing the storage specifier. 2673 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2674 SourceLocation(), 2675 PrevSpec, DiagID); 2676 } 2677 } 2678 2679 // Ignore const/volatile/restrict qualifiers. 2680 if (DS.getTypeQualifiers()) { 2681 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2682 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2683 << Record->isUnion() << 0 2684 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2685 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2686 Diag(DS.getVolatileSpecLoc(), 2687 diag::ext_anonymous_struct_union_qualified) 2688 << Record->isUnion() << 1 2689 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2690 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2691 Diag(DS.getRestrictSpecLoc(), 2692 diag::ext_anonymous_struct_union_qualified) 2693 << Record->isUnion() << 2 2694 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2695 2696 DS.ClearTypeQualifiers(); 2697 } 2698 2699 // C++ [class.union]p2: 2700 // The member-specification of an anonymous union shall only 2701 // define non-static data members. [Note: nested types and 2702 // functions cannot be declared within an anonymous union. ] 2703 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2704 MemEnd = Record->decls_end(); 2705 Mem != MemEnd; ++Mem) { 2706 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2707 // C++ [class.union]p3: 2708 // An anonymous union shall not have private or protected 2709 // members (clause 11). 2710 assert(FD->getAccess() != AS_none); 2711 if (FD->getAccess() != AS_public) { 2712 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2713 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2714 Invalid = true; 2715 } 2716 2717 // C++ [class.union]p1 2718 // An object of a class with a non-trivial constructor, a non-trivial 2719 // copy constructor, a non-trivial destructor, or a non-trivial copy 2720 // assignment operator cannot be a member of a union, nor can an 2721 // array of such objects. 2722 if (CheckNontrivialField(FD)) 2723 Invalid = true; 2724 } else if ((*Mem)->isImplicit()) { 2725 // Any implicit members are fine. 2726 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2727 // This is a type that showed up in an 2728 // elaborated-type-specifier inside the anonymous struct or 2729 // union, but which actually declares a type outside of the 2730 // anonymous struct or union. It's okay. 2731 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2732 if (!MemRecord->isAnonymousStructOrUnion() && 2733 MemRecord->getDeclName()) { 2734 // Visual C++ allows type definition in anonymous struct or union. 2735 if (getLangOptions().MicrosoftExt) 2736 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2737 << (int)Record->isUnion(); 2738 else { 2739 // This is a nested type declaration. 2740 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2741 << (int)Record->isUnion(); 2742 Invalid = true; 2743 } 2744 } 2745 } else if (isa<AccessSpecDecl>(*Mem)) { 2746 // Any access specifier is fine. 2747 } else { 2748 // We have something that isn't a non-static data 2749 // member. Complain about it. 2750 unsigned DK = diag::err_anonymous_record_bad_member; 2751 if (isa<TypeDecl>(*Mem)) 2752 DK = diag::err_anonymous_record_with_type; 2753 else if (isa<FunctionDecl>(*Mem)) 2754 DK = diag::err_anonymous_record_with_function; 2755 else if (isa<VarDecl>(*Mem)) 2756 DK = diag::err_anonymous_record_with_static; 2757 2758 // Visual C++ allows type definition in anonymous struct or union. 2759 if (getLangOptions().MicrosoftExt && 2760 DK == diag::err_anonymous_record_with_type) 2761 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2762 << (int)Record->isUnion(); 2763 else { 2764 Diag((*Mem)->getLocation(), DK) 2765 << (int)Record->isUnion(); 2766 Invalid = true; 2767 } 2768 } 2769 } 2770 } 2771 2772 if (!Record->isUnion() && !Owner->isRecord()) { 2773 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2774 << (int)getLangOptions().CPlusPlus; 2775 Invalid = true; 2776 } 2777 2778 // Mock up a declarator. 2779 Declarator Dc(DS, Declarator::MemberContext); 2780 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2781 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2782 2783 // Create a declaration for this anonymous struct/union. 2784 NamedDecl *Anon = 0; 2785 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2786 Anon = FieldDecl::Create(Context, OwningClass, 2787 DS.getSourceRange().getBegin(), 2788 Record->getLocation(), 2789 /*IdentifierInfo=*/0, 2790 Context.getTypeDeclType(Record), 2791 TInfo, 2792 /*BitWidth=*/0, /*Mutable=*/false, 2793 /*HasInit=*/false); 2794 Anon->setAccess(AS); 2795 if (getLangOptions().CPlusPlus) 2796 FieldCollector->Add(cast<FieldDecl>(Anon)); 2797 } else { 2798 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2799 assert(SCSpec != DeclSpec::SCS_typedef && 2800 "Parser allowed 'typedef' as storage class VarDecl."); 2801 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2802 if (SCSpec == DeclSpec::SCS_mutable) { 2803 // mutable can only appear on non-static class members, so it's always 2804 // an error here 2805 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2806 Invalid = true; 2807 SC = SC_None; 2808 } 2809 SCSpec = DS.getStorageClassSpecAsWritten(); 2810 VarDecl::StorageClass SCAsWritten 2811 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2812 2813 Anon = VarDecl::Create(Context, Owner, 2814 DS.getSourceRange().getBegin(), 2815 Record->getLocation(), /*IdentifierInfo=*/0, 2816 Context.getTypeDeclType(Record), 2817 TInfo, SC, SCAsWritten); 2818 2819 // Default-initialize the implicit variable. This initialization will be 2820 // trivial in almost all cases, except if a union member has an in-class 2821 // initializer: 2822 // union { int n = 0; }; 2823 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2824 } 2825 Anon->setImplicit(); 2826 2827 // Add the anonymous struct/union object to the current 2828 // context. We'll be referencing this object when we refer to one of 2829 // its members. 2830 Owner->addDecl(Anon); 2831 2832 // Inject the members of the anonymous struct/union into the owning 2833 // context and into the identifier resolver chain for name lookup 2834 // purposes. 2835 SmallVector<NamedDecl*, 2> Chain; 2836 Chain.push_back(Anon); 2837 2838 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2839 Chain, false)) 2840 Invalid = true; 2841 2842 // Mark this as an anonymous struct/union type. Note that we do not 2843 // do this until after we have already checked and injected the 2844 // members of this anonymous struct/union type, because otherwise 2845 // the members could be injected twice: once by DeclContext when it 2846 // builds its lookup table, and once by 2847 // InjectAnonymousStructOrUnionMembers. 2848 Record->setAnonymousStructOrUnion(true); 2849 2850 if (Invalid) 2851 Anon->setInvalidDecl(); 2852 2853 return Anon; 2854} 2855 2856/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2857/// Microsoft C anonymous structure. 2858/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2859/// Example: 2860/// 2861/// struct A { int a; }; 2862/// struct B { struct A; int b; }; 2863/// 2864/// void foo() { 2865/// B var; 2866/// var.a = 3; 2867/// } 2868/// 2869Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2870 RecordDecl *Record) { 2871 2872 // If there is no Record, get the record via the typedef. 2873 if (!Record) 2874 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2875 2876 // Mock up a declarator. 2877 Declarator Dc(DS, Declarator::TypeNameContext); 2878 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2879 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2880 2881 // Create a declaration for this anonymous struct. 2882 NamedDecl* Anon = FieldDecl::Create(Context, 2883 cast<RecordDecl>(CurContext), 2884 DS.getSourceRange().getBegin(), 2885 DS.getSourceRange().getBegin(), 2886 /*IdentifierInfo=*/0, 2887 Context.getTypeDeclType(Record), 2888 TInfo, 2889 /*BitWidth=*/0, /*Mutable=*/false, 2890 /*HasInit=*/false); 2891 Anon->setImplicit(); 2892 2893 // Add the anonymous struct object to the current context. 2894 CurContext->addDecl(Anon); 2895 2896 // Inject the members of the anonymous struct into the current 2897 // context and into the identifier resolver chain for name lookup 2898 // purposes. 2899 SmallVector<NamedDecl*, 2> Chain; 2900 Chain.push_back(Anon); 2901 2902 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2903 Record->getDefinition(), 2904 AS_none, Chain, true)) 2905 Anon->setInvalidDecl(); 2906 2907 return Anon; 2908} 2909 2910/// GetNameForDeclarator - Determine the full declaration name for the 2911/// given Declarator. 2912DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2913 return GetNameFromUnqualifiedId(D.getName()); 2914} 2915 2916/// \brief Retrieves the declaration name from a parsed unqualified-id. 2917DeclarationNameInfo 2918Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2919 DeclarationNameInfo NameInfo; 2920 NameInfo.setLoc(Name.StartLocation); 2921 2922 switch (Name.getKind()) { 2923 2924 case UnqualifiedId::IK_ImplicitSelfParam: 2925 case UnqualifiedId::IK_Identifier: 2926 NameInfo.setName(Name.Identifier); 2927 NameInfo.setLoc(Name.StartLocation); 2928 return NameInfo; 2929 2930 case UnqualifiedId::IK_OperatorFunctionId: 2931 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2932 Name.OperatorFunctionId.Operator)); 2933 NameInfo.setLoc(Name.StartLocation); 2934 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2935 = Name.OperatorFunctionId.SymbolLocations[0]; 2936 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2937 = Name.EndLocation.getRawEncoding(); 2938 return NameInfo; 2939 2940 case UnqualifiedId::IK_LiteralOperatorId: 2941 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2942 Name.Identifier)); 2943 NameInfo.setLoc(Name.StartLocation); 2944 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2945 return NameInfo; 2946 2947 case UnqualifiedId::IK_ConversionFunctionId: { 2948 TypeSourceInfo *TInfo; 2949 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2950 if (Ty.isNull()) 2951 return DeclarationNameInfo(); 2952 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2953 Context.getCanonicalType(Ty))); 2954 NameInfo.setLoc(Name.StartLocation); 2955 NameInfo.setNamedTypeInfo(TInfo); 2956 return NameInfo; 2957 } 2958 2959 case UnqualifiedId::IK_ConstructorName: { 2960 TypeSourceInfo *TInfo; 2961 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2962 if (Ty.isNull()) 2963 return DeclarationNameInfo(); 2964 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2965 Context.getCanonicalType(Ty))); 2966 NameInfo.setLoc(Name.StartLocation); 2967 NameInfo.setNamedTypeInfo(TInfo); 2968 return NameInfo; 2969 } 2970 2971 case UnqualifiedId::IK_ConstructorTemplateId: { 2972 // In well-formed code, we can only have a constructor 2973 // template-id that refers to the current context, so go there 2974 // to find the actual type being constructed. 2975 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2976 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2977 return DeclarationNameInfo(); 2978 2979 // Determine the type of the class being constructed. 2980 QualType CurClassType = Context.getTypeDeclType(CurClass); 2981 2982 // FIXME: Check two things: that the template-id names the same type as 2983 // CurClassType, and that the template-id does not occur when the name 2984 // was qualified. 2985 2986 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2987 Context.getCanonicalType(CurClassType))); 2988 NameInfo.setLoc(Name.StartLocation); 2989 // FIXME: should we retrieve TypeSourceInfo? 2990 NameInfo.setNamedTypeInfo(0); 2991 return NameInfo; 2992 } 2993 2994 case UnqualifiedId::IK_DestructorName: { 2995 TypeSourceInfo *TInfo; 2996 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2997 if (Ty.isNull()) 2998 return DeclarationNameInfo(); 2999 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3000 Context.getCanonicalType(Ty))); 3001 NameInfo.setLoc(Name.StartLocation); 3002 NameInfo.setNamedTypeInfo(TInfo); 3003 return NameInfo; 3004 } 3005 3006 case UnqualifiedId::IK_TemplateId: { 3007 TemplateName TName = Name.TemplateId->Template.get(); 3008 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3009 return Context.getNameForTemplate(TName, TNameLoc); 3010 } 3011 3012 } // switch (Name.getKind()) 3013 3014 llvm_unreachable("Unknown name kind"); 3015} 3016 3017static QualType getCoreType(QualType Ty) { 3018 do { 3019 if (Ty->isPointerType() || Ty->isReferenceType()) 3020 Ty = Ty->getPointeeType(); 3021 else if (Ty->isArrayType()) 3022 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3023 else 3024 return Ty.withoutLocalFastQualifiers(); 3025 } while (true); 3026} 3027 3028/// hasSimilarParameters - Determine whether the C++ functions Declaration 3029/// and Definition have "nearly" matching parameters. This heuristic is 3030/// used to improve diagnostics in the case where an out-of-line function 3031/// definition doesn't match any declaration within the class or namespace. 3032/// Also sets Params to the list of indices to the parameters that differ 3033/// between the declaration and the definition. If hasSimilarParameters 3034/// returns true and Params is empty, then all of the parameters match. 3035static bool hasSimilarParameters(ASTContext &Context, 3036 FunctionDecl *Declaration, 3037 FunctionDecl *Definition, 3038 llvm::SmallVectorImpl<unsigned> &Params) { 3039 Params.clear(); 3040 if (Declaration->param_size() != Definition->param_size()) 3041 return false; 3042 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3043 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3044 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3045 3046 // The parameter types are identical 3047 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3048 continue; 3049 3050 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3051 QualType DefParamBaseTy = getCoreType(DefParamTy); 3052 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3053 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3054 3055 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3056 (DeclTyName && DeclTyName == DefTyName)) 3057 Params.push_back(Idx); 3058 else // The two parameters aren't even close 3059 return false; 3060 } 3061 3062 return true; 3063} 3064 3065/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3066/// declarator needs to be rebuilt in the current instantiation. 3067/// Any bits of declarator which appear before the name are valid for 3068/// consideration here. That's specifically the type in the decl spec 3069/// and the base type in any member-pointer chunks. 3070static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3071 DeclarationName Name) { 3072 // The types we specifically need to rebuild are: 3073 // - typenames, typeofs, and decltypes 3074 // - types which will become injected class names 3075 // Of course, we also need to rebuild any type referencing such a 3076 // type. It's safest to just say "dependent", but we call out a 3077 // few cases here. 3078 3079 DeclSpec &DS = D.getMutableDeclSpec(); 3080 switch (DS.getTypeSpecType()) { 3081 case DeclSpec::TST_typename: 3082 case DeclSpec::TST_typeofType: 3083 case DeclSpec::TST_decltype: 3084 case DeclSpec::TST_underlyingType: 3085 case DeclSpec::TST_atomic: { 3086 // Grab the type from the parser. 3087 TypeSourceInfo *TSI = 0; 3088 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3089 if (T.isNull() || !T->isDependentType()) break; 3090 3091 // Make sure there's a type source info. This isn't really much 3092 // of a waste; most dependent types should have type source info 3093 // attached already. 3094 if (!TSI) 3095 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3096 3097 // Rebuild the type in the current instantiation. 3098 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3099 if (!TSI) return true; 3100 3101 // Store the new type back in the decl spec. 3102 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3103 DS.UpdateTypeRep(LocType); 3104 break; 3105 } 3106 3107 case DeclSpec::TST_typeofExpr: { 3108 Expr *E = DS.getRepAsExpr(); 3109 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3110 if (Result.isInvalid()) return true; 3111 DS.UpdateExprRep(Result.get()); 3112 break; 3113 } 3114 3115 default: 3116 // Nothing to do for these decl specs. 3117 break; 3118 } 3119 3120 // It doesn't matter what order we do this in. 3121 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3122 DeclaratorChunk &Chunk = D.getTypeObject(I); 3123 3124 // The only type information in the declarator which can come 3125 // before the declaration name is the base type of a member 3126 // pointer. 3127 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3128 continue; 3129 3130 // Rebuild the scope specifier in-place. 3131 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3132 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3133 return true; 3134 } 3135 3136 return false; 3137} 3138 3139Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3140 D.setFunctionDefinition(false); 3141 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3142} 3143 3144/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3145/// If T is the name of a class, then each of the following shall have a 3146/// name different from T: 3147/// - every static data member of class T; 3148/// - every member function of class T 3149/// - every member of class T that is itself a type; 3150/// \returns true if the declaration name violates these rules. 3151bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3152 DeclarationNameInfo NameInfo) { 3153 DeclarationName Name = NameInfo.getName(); 3154 3155 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3156 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3157 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3158 return true; 3159 } 3160 3161 return false; 3162} 3163 3164Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3165 MultiTemplateParamsArg TemplateParamLists) { 3166 // TODO: consider using NameInfo for diagnostic. 3167 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3168 DeclarationName Name = NameInfo.getName(); 3169 3170 // All of these full declarators require an identifier. If it doesn't have 3171 // one, the ParsedFreeStandingDeclSpec action should be used. 3172 if (!Name) { 3173 if (!D.isInvalidType()) // Reject this if we think it is valid. 3174 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3175 diag::err_declarator_need_ident) 3176 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3177 return 0; 3178 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3179 return 0; 3180 3181 // The scope passed in may not be a decl scope. Zip up the scope tree until 3182 // we find one that is. 3183 while ((S->getFlags() & Scope::DeclScope) == 0 || 3184 (S->getFlags() & Scope::TemplateParamScope) != 0) 3185 S = S->getParent(); 3186 3187 DeclContext *DC = CurContext; 3188 if (D.getCXXScopeSpec().isInvalid()) 3189 D.setInvalidType(); 3190 else if (D.getCXXScopeSpec().isSet()) { 3191 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3192 UPPC_DeclarationQualifier)) 3193 return 0; 3194 3195 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3196 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3197 if (!DC) { 3198 // If we could not compute the declaration context, it's because the 3199 // declaration context is dependent but does not refer to a class, 3200 // class template, or class template partial specialization. Complain 3201 // and return early, to avoid the coming semantic disaster. 3202 Diag(D.getIdentifierLoc(), 3203 diag::err_template_qualified_declarator_no_match) 3204 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3205 << D.getCXXScopeSpec().getRange(); 3206 return 0; 3207 } 3208 bool IsDependentContext = DC->isDependentContext(); 3209 3210 if (!IsDependentContext && 3211 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3212 return 0; 3213 3214 if (isa<CXXRecordDecl>(DC)) { 3215 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3216 Diag(D.getIdentifierLoc(), 3217 diag::err_member_def_undefined_record) 3218 << Name << DC << D.getCXXScopeSpec().getRange(); 3219 D.setInvalidType(); 3220 } else if (isa<CXXRecordDecl>(CurContext) && 3221 !D.getDeclSpec().isFriendSpecified()) { 3222 // The user provided a superfluous scope specifier inside a class 3223 // definition: 3224 // 3225 // class X { 3226 // void X::f(); 3227 // }; 3228 if (CurContext->Equals(DC)) 3229 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3230 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3231 else 3232 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3233 << Name << D.getCXXScopeSpec().getRange(); 3234 3235 // Pretend that this qualifier was not here. 3236 D.getCXXScopeSpec().clear(); 3237 } 3238 } 3239 3240 // Check whether we need to rebuild the type of the given 3241 // declaration in the current instantiation. 3242 if (EnteringContext && IsDependentContext && 3243 TemplateParamLists.size() != 0) { 3244 ContextRAII SavedContext(*this, DC); 3245 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3246 D.setInvalidType(); 3247 } 3248 } 3249 3250 if (DiagnoseClassNameShadow(DC, NameInfo)) 3251 // If this is a typedef, we'll end up spewing multiple diagnostics. 3252 // Just return early; it's safer. 3253 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3254 return 0; 3255 3256 NamedDecl *New; 3257 3258 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3259 QualType R = TInfo->getType(); 3260 3261 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3262 UPPC_DeclarationType)) 3263 D.setInvalidType(); 3264 3265 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3266 ForRedeclaration); 3267 3268 // See if this is a redefinition of a variable in the same scope. 3269 if (!D.getCXXScopeSpec().isSet()) { 3270 bool IsLinkageLookup = false; 3271 3272 // If the declaration we're planning to build will be a function 3273 // or object with linkage, then look for another declaration with 3274 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3275 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3276 /* Do nothing*/; 3277 else if (R->isFunctionType()) { 3278 if (CurContext->isFunctionOrMethod() || 3279 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3280 IsLinkageLookup = true; 3281 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3282 IsLinkageLookup = true; 3283 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3284 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3285 IsLinkageLookup = true; 3286 3287 if (IsLinkageLookup) 3288 Previous.clear(LookupRedeclarationWithLinkage); 3289 3290 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3291 } else { // Something like "int foo::x;" 3292 LookupQualifiedName(Previous, DC); 3293 3294 // Don't consider using declarations as previous declarations for 3295 // out-of-line members. 3296 RemoveUsingDecls(Previous); 3297 3298 // C++ 7.3.1.2p2: 3299 // Members (including explicit specializations of templates) of a named 3300 // namespace can also be defined outside that namespace by explicit 3301 // qualification of the name being defined, provided that the entity being 3302 // defined was already declared in the namespace and the definition appears 3303 // after the point of declaration in a namespace that encloses the 3304 // declarations namespace. 3305 // 3306 // Note that we only check the context at this point. We don't yet 3307 // have enough information to make sure that PrevDecl is actually 3308 // the declaration we want to match. For example, given: 3309 // 3310 // class X { 3311 // void f(); 3312 // void f(float); 3313 // }; 3314 // 3315 // void X::f(int) { } // ill-formed 3316 // 3317 // In this case, PrevDecl will point to the overload set 3318 // containing the two f's declared in X, but neither of them 3319 // matches. 3320 3321 // First check whether we named the global scope. 3322 if (isa<TranslationUnitDecl>(DC)) { 3323 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3324 << Name << D.getCXXScopeSpec().getRange(); 3325 } else { 3326 DeclContext *Cur = CurContext; 3327 while (isa<LinkageSpecDecl>(Cur)) 3328 Cur = Cur->getParent(); 3329 if (!Cur->Encloses(DC)) { 3330 // The qualifying scope doesn't enclose the original declaration. 3331 // Emit diagnostic based on current scope. 3332 SourceLocation L = D.getIdentifierLoc(); 3333 SourceRange R = D.getCXXScopeSpec().getRange(); 3334 if (isa<FunctionDecl>(Cur)) 3335 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3336 else 3337 Diag(L, diag::err_invalid_declarator_scope) 3338 << Name << cast<NamedDecl>(DC) << R; 3339 D.setInvalidType(); 3340 } 3341 } 3342 } 3343 3344 if (Previous.isSingleResult() && 3345 Previous.getFoundDecl()->isTemplateParameter()) { 3346 // Maybe we will complain about the shadowed template parameter. 3347 if (!D.isInvalidType()) 3348 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3349 Previous.getFoundDecl()); 3350 3351 // Just pretend that we didn't see the previous declaration. 3352 Previous.clear(); 3353 } 3354 3355 // In C++, the previous declaration we find might be a tag type 3356 // (class or enum). In this case, the new declaration will hide the 3357 // tag type. Note that this does does not apply if we're declaring a 3358 // typedef (C++ [dcl.typedef]p4). 3359 if (Previous.isSingleTagDecl() && 3360 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3361 Previous.clear(); 3362 3363 bool AddToScope = true; 3364 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3365 if (TemplateParamLists.size()) { 3366 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3367 return 0; 3368 } 3369 3370 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3371 } else if (R->isFunctionType()) { 3372 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3373 move(TemplateParamLists), 3374 AddToScope); 3375 } else { 3376 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3377 move(TemplateParamLists)); 3378 } 3379 3380 if (New == 0) 3381 return 0; 3382 3383 // If this has an identifier and is not an invalid redeclaration or 3384 // function template specialization, add it to the scope stack. 3385 if (New->getDeclName() && AddToScope && 3386 !(D.isRedeclaration() && New->isInvalidDecl())) 3387 PushOnScopeChains(New, S); 3388 3389 return New; 3390} 3391 3392/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3393/// types into constant array types in certain situations which would otherwise 3394/// be errors (for GCC compatibility). 3395static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3396 ASTContext &Context, 3397 bool &SizeIsNegative, 3398 llvm::APSInt &Oversized) { 3399 // This method tries to turn a variable array into a constant 3400 // array even when the size isn't an ICE. This is necessary 3401 // for compatibility with code that depends on gcc's buggy 3402 // constant expression folding, like struct {char x[(int)(char*)2];} 3403 SizeIsNegative = false; 3404 Oversized = 0; 3405 3406 if (T->isDependentType()) 3407 return QualType(); 3408 3409 QualifierCollector Qs; 3410 const Type *Ty = Qs.strip(T); 3411 3412 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3413 QualType Pointee = PTy->getPointeeType(); 3414 QualType FixedType = 3415 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3416 Oversized); 3417 if (FixedType.isNull()) return FixedType; 3418 FixedType = Context.getPointerType(FixedType); 3419 return Qs.apply(Context, FixedType); 3420 } 3421 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3422 QualType Inner = PTy->getInnerType(); 3423 QualType FixedType = 3424 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3425 Oversized); 3426 if (FixedType.isNull()) return FixedType; 3427 FixedType = Context.getParenType(FixedType); 3428 return Qs.apply(Context, FixedType); 3429 } 3430 3431 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3432 if (!VLATy) 3433 return QualType(); 3434 // FIXME: We should probably handle this case 3435 if (VLATy->getElementType()->isVariablyModifiedType()) 3436 return QualType(); 3437 3438 Expr::EvalResult EvalResult; 3439 if (!VLATy->getSizeExpr() || 3440 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3441 !EvalResult.Val.isInt()) 3442 return QualType(); 3443 3444 // Check whether the array size is negative. 3445 llvm::APSInt &Res = EvalResult.Val.getInt(); 3446 if (Res.isSigned() && Res.isNegative()) { 3447 SizeIsNegative = true; 3448 return QualType(); 3449 } 3450 3451 // Check whether the array is too large to be addressed. 3452 unsigned ActiveSizeBits 3453 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3454 Res); 3455 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3456 Oversized = Res; 3457 return QualType(); 3458 } 3459 3460 return Context.getConstantArrayType(VLATy->getElementType(), 3461 Res, ArrayType::Normal, 0); 3462} 3463 3464/// \brief Register the given locally-scoped external C declaration so 3465/// that it can be found later for redeclarations 3466void 3467Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3468 const LookupResult &Previous, 3469 Scope *S) { 3470 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3471 "Decl is not a locally-scoped decl!"); 3472 // Note that we have a locally-scoped external with this name. 3473 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3474 3475 if (!Previous.isSingleResult()) 3476 return; 3477 3478 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3479 3480 // If there was a previous declaration of this variable, it may be 3481 // in our identifier chain. Update the identifier chain with the new 3482 // declaration. 3483 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3484 // The previous declaration was found on the identifer resolver 3485 // chain, so remove it from its scope. 3486 3487 if (S->isDeclScope(PrevDecl)) { 3488 // Special case for redeclarations in the SAME scope. 3489 // Because this declaration is going to be added to the identifier chain 3490 // later, we should temporarily take it OFF the chain. 3491 IdResolver.RemoveDecl(ND); 3492 3493 } else { 3494 // Find the scope for the original declaration. 3495 while (S && !S->isDeclScope(PrevDecl)) 3496 S = S->getParent(); 3497 } 3498 3499 if (S) 3500 S->RemoveDecl(PrevDecl); 3501 } 3502} 3503 3504llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3505Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3506 if (ExternalSource) { 3507 // Load locally-scoped external decls from the external source. 3508 SmallVector<NamedDecl *, 4> Decls; 3509 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3510 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3511 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3512 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3513 if (Pos == LocallyScopedExternalDecls.end()) 3514 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3515 } 3516 } 3517 3518 return LocallyScopedExternalDecls.find(Name); 3519} 3520 3521/// \brief Diagnose function specifiers on a declaration of an identifier that 3522/// does not identify a function. 3523void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3524 // FIXME: We should probably indicate the identifier in question to avoid 3525 // confusion for constructs like "inline int a(), b;" 3526 if (D.getDeclSpec().isInlineSpecified()) 3527 Diag(D.getDeclSpec().getInlineSpecLoc(), 3528 diag::err_inline_non_function); 3529 3530 if (D.getDeclSpec().isVirtualSpecified()) 3531 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3532 diag::err_virtual_non_function); 3533 3534 if (D.getDeclSpec().isExplicitSpecified()) 3535 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3536 diag::err_explicit_non_function); 3537} 3538 3539NamedDecl* 3540Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3541 TypeSourceInfo *TInfo, LookupResult &Previous) { 3542 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3543 if (D.getCXXScopeSpec().isSet()) { 3544 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3545 << D.getCXXScopeSpec().getRange(); 3546 D.setInvalidType(); 3547 // Pretend we didn't see the scope specifier. 3548 DC = CurContext; 3549 Previous.clear(); 3550 } 3551 3552 if (getLangOptions().CPlusPlus) { 3553 // Check that there are no default arguments (C++ only). 3554 CheckExtraCXXDefaultArguments(D); 3555 } 3556 3557 DiagnoseFunctionSpecifiers(D); 3558 3559 if (D.getDeclSpec().isThreadSpecified()) 3560 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3561 if (D.getDeclSpec().isConstexprSpecified()) 3562 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3563 << 1; 3564 3565 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3566 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3567 << D.getName().getSourceRange(); 3568 return 0; 3569 } 3570 3571 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3572 if (!NewTD) return 0; 3573 3574 // Handle attributes prior to checking for duplicates in MergeVarDecl 3575 ProcessDeclAttributes(S, NewTD, D); 3576 3577 CheckTypedefForVariablyModifiedType(S, NewTD); 3578 3579 bool Redeclaration = D.isRedeclaration(); 3580 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3581 D.setRedeclaration(Redeclaration); 3582 return ND; 3583} 3584 3585void 3586Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3587 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3588 // then it shall have block scope. 3589 // Note that variably modified types must be fixed before merging the decl so 3590 // that redeclarations will match. 3591 QualType T = NewTD->getUnderlyingType(); 3592 if (T->isVariablyModifiedType()) { 3593 getCurFunction()->setHasBranchProtectedScope(); 3594 3595 if (S->getFnParent() == 0) { 3596 bool SizeIsNegative; 3597 llvm::APSInt Oversized; 3598 QualType FixedTy = 3599 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3600 Oversized); 3601 if (!FixedTy.isNull()) { 3602 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3603 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3604 } else { 3605 if (SizeIsNegative) 3606 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3607 else if (T->isVariableArrayType()) 3608 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3609 else if (Oversized.getBoolValue()) 3610 Diag(NewTD->getLocation(), diag::err_array_too_large) 3611 << Oversized.toString(10); 3612 else 3613 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3614 NewTD->setInvalidDecl(); 3615 } 3616 } 3617 } 3618} 3619 3620 3621/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3622/// declares a typedef-name, either using the 'typedef' type specifier or via 3623/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3624NamedDecl* 3625Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3626 LookupResult &Previous, bool &Redeclaration) { 3627 // Merge the decl with the existing one if appropriate. If the decl is 3628 // in an outer scope, it isn't the same thing. 3629 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3630 /*ExplicitInstantiationOrSpecialization=*/false); 3631 if (!Previous.empty()) { 3632 Redeclaration = true; 3633 MergeTypedefNameDecl(NewTD, Previous); 3634 } 3635 3636 // If this is the C FILE type, notify the AST context. 3637 if (IdentifierInfo *II = NewTD->getIdentifier()) 3638 if (!NewTD->isInvalidDecl() && 3639 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3640 if (II->isStr("FILE")) 3641 Context.setFILEDecl(NewTD); 3642 else if (II->isStr("jmp_buf")) 3643 Context.setjmp_bufDecl(NewTD); 3644 else if (II->isStr("sigjmp_buf")) 3645 Context.setsigjmp_bufDecl(NewTD); 3646 else if (II->isStr("__builtin_va_list")) 3647 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3648 } 3649 3650 return NewTD; 3651} 3652 3653/// \brief Determines whether the given declaration is an out-of-scope 3654/// previous declaration. 3655/// 3656/// This routine should be invoked when name lookup has found a 3657/// previous declaration (PrevDecl) that is not in the scope where a 3658/// new declaration by the same name is being introduced. If the new 3659/// declaration occurs in a local scope, previous declarations with 3660/// linkage may still be considered previous declarations (C99 3661/// 6.2.2p4-5, C++ [basic.link]p6). 3662/// 3663/// \param PrevDecl the previous declaration found by name 3664/// lookup 3665/// 3666/// \param DC the context in which the new declaration is being 3667/// declared. 3668/// 3669/// \returns true if PrevDecl is an out-of-scope previous declaration 3670/// for a new delcaration with the same name. 3671static bool 3672isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3673 ASTContext &Context) { 3674 if (!PrevDecl) 3675 return false; 3676 3677 if (!PrevDecl->hasLinkage()) 3678 return false; 3679 3680 if (Context.getLangOptions().CPlusPlus) { 3681 // C++ [basic.link]p6: 3682 // If there is a visible declaration of an entity with linkage 3683 // having the same name and type, ignoring entities declared 3684 // outside the innermost enclosing namespace scope, the block 3685 // scope declaration declares that same entity and receives the 3686 // linkage of the previous declaration. 3687 DeclContext *OuterContext = DC->getRedeclContext(); 3688 if (!OuterContext->isFunctionOrMethod()) 3689 // This rule only applies to block-scope declarations. 3690 return false; 3691 3692 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3693 if (PrevOuterContext->isRecord()) 3694 // We found a member function: ignore it. 3695 return false; 3696 3697 // Find the innermost enclosing namespace for the new and 3698 // previous declarations. 3699 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3700 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3701 3702 // The previous declaration is in a different namespace, so it 3703 // isn't the same function. 3704 if (!OuterContext->Equals(PrevOuterContext)) 3705 return false; 3706 } 3707 3708 return true; 3709} 3710 3711static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3712 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3713 if (!SS.isSet()) return; 3714 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3715} 3716 3717bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3718 QualType type = decl->getType(); 3719 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3720 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3721 // Various kinds of declaration aren't allowed to be __autoreleasing. 3722 unsigned kind = -1U; 3723 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3724 if (var->hasAttr<BlocksAttr>()) 3725 kind = 0; // __block 3726 else if (!var->hasLocalStorage()) 3727 kind = 1; // global 3728 } else if (isa<ObjCIvarDecl>(decl)) { 3729 kind = 3; // ivar 3730 } else if (isa<FieldDecl>(decl)) { 3731 kind = 2; // field 3732 } 3733 3734 if (kind != -1U) { 3735 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3736 << kind; 3737 } 3738 } else if (lifetime == Qualifiers::OCL_None) { 3739 // Try to infer lifetime. 3740 if (!type->isObjCLifetimeType()) 3741 return false; 3742 3743 lifetime = type->getObjCARCImplicitLifetime(); 3744 type = Context.getLifetimeQualifiedType(type, lifetime); 3745 decl->setType(type); 3746 } 3747 3748 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3749 // Thread-local variables cannot have lifetime. 3750 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3751 var->isThreadSpecified()) { 3752 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3753 << var->getType(); 3754 return true; 3755 } 3756 } 3757 3758 return false; 3759} 3760 3761NamedDecl* 3762Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3763 TypeSourceInfo *TInfo, LookupResult &Previous, 3764 MultiTemplateParamsArg TemplateParamLists) { 3765 QualType R = TInfo->getType(); 3766 DeclarationName Name = GetNameForDeclarator(D).getName(); 3767 3768 // Check that there are no default arguments (C++ only). 3769 if (getLangOptions().CPlusPlus) 3770 CheckExtraCXXDefaultArguments(D); 3771 3772 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3773 assert(SCSpec != DeclSpec::SCS_typedef && 3774 "Parser allowed 'typedef' as storage class VarDecl."); 3775 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3776 if (SCSpec == DeclSpec::SCS_mutable) { 3777 // mutable can only appear on non-static class members, so it's always 3778 // an error here 3779 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3780 D.setInvalidType(); 3781 SC = SC_None; 3782 } 3783 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3784 VarDecl::StorageClass SCAsWritten 3785 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3786 3787 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3788 if (!II) { 3789 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3790 << Name; 3791 return 0; 3792 } 3793 3794 DiagnoseFunctionSpecifiers(D); 3795 3796 if (!DC->isRecord() && S->getFnParent() == 0) { 3797 // C99 6.9p2: The storage-class specifiers auto and register shall not 3798 // appear in the declaration specifiers in an external declaration. 3799 if (SC == SC_Auto || SC == SC_Register) { 3800 3801 // If this is a register variable with an asm label specified, then this 3802 // is a GNU extension. 3803 if (SC == SC_Register && D.getAsmLabel()) 3804 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3805 else 3806 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3807 D.setInvalidType(); 3808 } 3809 } 3810 3811 if (getLangOptions().OpenCL) { 3812 // Set up the special work-group-local storage class for variables in the 3813 // OpenCL __local address space. 3814 if (R.getAddressSpace() == LangAS::opencl_local) 3815 SC = SC_OpenCLWorkGroupLocal; 3816 } 3817 3818 bool isExplicitSpecialization = false; 3819 VarDecl *NewVD; 3820 if (!getLangOptions().CPlusPlus) { 3821 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3822 D.getIdentifierLoc(), II, 3823 R, TInfo, SC, SCAsWritten); 3824 3825 if (D.isInvalidType()) 3826 NewVD->setInvalidDecl(); 3827 } else { 3828 if (DC->isRecord() && !CurContext->isRecord()) { 3829 // This is an out-of-line definition of a static data member. 3830 if (SC == SC_Static) { 3831 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3832 diag::err_static_out_of_line) 3833 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3834 } else if (SC == SC_None) 3835 SC = SC_Static; 3836 } 3837 if (SC == SC_Static) { 3838 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3839 if (RD->isLocalClass()) 3840 Diag(D.getIdentifierLoc(), 3841 diag::err_static_data_member_not_allowed_in_local_class) 3842 << Name << RD->getDeclName(); 3843 3844 // C++ [class.union]p1: If a union contains a static data member, 3845 // the program is ill-formed. 3846 // 3847 // We also disallow static data members in anonymous structs. 3848 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3849 Diag(D.getIdentifierLoc(), 3850 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3851 << Name << RD->isUnion(); 3852 } 3853 } 3854 3855 // Match up the template parameter lists with the scope specifier, then 3856 // determine whether we have a template or a template specialization. 3857 isExplicitSpecialization = false; 3858 bool Invalid = false; 3859 if (TemplateParameterList *TemplateParams 3860 = MatchTemplateParametersToScopeSpecifier( 3861 D.getDeclSpec().getSourceRange().getBegin(), 3862 D.getIdentifierLoc(), 3863 D.getCXXScopeSpec(), 3864 TemplateParamLists.get(), 3865 TemplateParamLists.size(), 3866 /*never a friend*/ false, 3867 isExplicitSpecialization, 3868 Invalid)) { 3869 if (TemplateParams->size() > 0) { 3870 // There is no such thing as a variable template. 3871 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3872 << II 3873 << SourceRange(TemplateParams->getTemplateLoc(), 3874 TemplateParams->getRAngleLoc()); 3875 return 0; 3876 } else { 3877 // There is an extraneous 'template<>' for this variable. Complain 3878 // about it, but allow the declaration of the variable. 3879 Diag(TemplateParams->getTemplateLoc(), 3880 diag::err_template_variable_noparams) 3881 << II 3882 << SourceRange(TemplateParams->getTemplateLoc(), 3883 TemplateParams->getRAngleLoc()); 3884 } 3885 } 3886 3887 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3888 D.getIdentifierLoc(), II, 3889 R, TInfo, SC, SCAsWritten); 3890 3891 // If this decl has an auto type in need of deduction, make a note of the 3892 // Decl so we can diagnose uses of it in its own initializer. 3893 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3894 R->getContainedAutoType()) 3895 ParsingInitForAutoVars.insert(NewVD); 3896 3897 if (D.isInvalidType() || Invalid) 3898 NewVD->setInvalidDecl(); 3899 3900 SetNestedNameSpecifier(NewVD, D); 3901 3902 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3903 NewVD->setTemplateParameterListsInfo(Context, 3904 TemplateParamLists.size(), 3905 TemplateParamLists.release()); 3906 } 3907 3908 if (D.getDeclSpec().isConstexprSpecified()) { 3909 // FIXME: once we know whether there's an initializer, apply this to 3910 // static data members too. 3911 if (!NewVD->isStaticDataMember() && 3912 !NewVD->isThisDeclarationADefinition()) { 3913 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3914 // of a variable. Suggest replacing it with 'const' if appropriate. 3915 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3916 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3917 // If the declarator is complex, we need to move the keyword to the 3918 // innermost chunk as we switch it from 'constexpr' to 'const'. 3919 int Kind = DeclaratorChunk::Paren; 3920 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3921 Kind = D.getTypeObject(I).Kind; 3922 if (Kind != DeclaratorChunk::Paren) 3923 break; 3924 } 3925 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3926 Kind == DeclaratorChunk::Reference) 3927 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3928 << FixItHint::CreateRemoval(ConstexprRange); 3929 else if (Kind == DeclaratorChunk::Paren) 3930 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3931 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3932 else 3933 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3934 << FixItHint::CreateRemoval(ConstexprRange) 3935 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3936 } else { 3937 NewVD->setConstexpr(true); 3938 } 3939 } 3940 } 3941 3942 // Set the lexical context. If the declarator has a C++ scope specifier, the 3943 // lexical context will be different from the semantic context. 3944 NewVD->setLexicalDeclContext(CurContext); 3945 3946 if (D.getDeclSpec().isThreadSpecified()) { 3947 if (NewVD->hasLocalStorage()) 3948 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3949 else if (!Context.getTargetInfo().isTLSSupported()) 3950 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3951 else 3952 NewVD->setThreadSpecified(true); 3953 } 3954 3955 if (D.getDeclSpec().isModulePrivateSpecified()) { 3956 if (isExplicitSpecialization) 3957 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3958 << 2 3959 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3960 else if (NewVD->hasLocalStorage()) 3961 Diag(NewVD->getLocation(), diag::err_module_private_local) 3962 << 0 << NewVD->getDeclName() 3963 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3964 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3965 else 3966 NewVD->setModulePrivate(); 3967 } 3968 3969 // Handle attributes prior to checking for duplicates in MergeVarDecl 3970 ProcessDeclAttributes(S, NewVD, D); 3971 3972 // In auto-retain/release, infer strong retension for variables of 3973 // retainable type. 3974 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3975 NewVD->setInvalidDecl(); 3976 3977 // Handle GNU asm-label extension (encoded as an attribute). 3978 if (Expr *E = (Expr*)D.getAsmLabel()) { 3979 // The parser guarantees this is a string. 3980 StringLiteral *SE = cast<StringLiteral>(E); 3981 StringRef Label = SE->getString(); 3982 if (S->getFnParent() != 0) { 3983 switch (SC) { 3984 case SC_None: 3985 case SC_Auto: 3986 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3987 break; 3988 case SC_Register: 3989 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3990 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3991 break; 3992 case SC_Static: 3993 case SC_Extern: 3994 case SC_PrivateExtern: 3995 case SC_OpenCLWorkGroupLocal: 3996 break; 3997 } 3998 } 3999 4000 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4001 Context, Label)); 4002 } 4003 4004 // Diagnose shadowed variables before filtering for scope. 4005 if (!D.getCXXScopeSpec().isSet()) 4006 CheckShadow(S, NewVD, Previous); 4007 4008 // Don't consider existing declarations that are in a different 4009 // scope and are out-of-semantic-context declarations (if the new 4010 // declaration has linkage). 4011 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4012 isExplicitSpecialization); 4013 4014 if (!getLangOptions().CPlusPlus) { 4015 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4016 } else { 4017 // Merge the decl with the existing one if appropriate. 4018 if (!Previous.empty()) { 4019 if (Previous.isSingleResult() && 4020 isa<FieldDecl>(Previous.getFoundDecl()) && 4021 D.getCXXScopeSpec().isSet()) { 4022 // The user tried to define a non-static data member 4023 // out-of-line (C++ [dcl.meaning]p1). 4024 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4025 << D.getCXXScopeSpec().getRange(); 4026 Previous.clear(); 4027 NewVD->setInvalidDecl(); 4028 } 4029 } else if (D.getCXXScopeSpec().isSet()) { 4030 // No previous declaration in the qualifying scope. 4031 Diag(D.getIdentifierLoc(), diag::err_no_member) 4032 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4033 << D.getCXXScopeSpec().getRange(); 4034 NewVD->setInvalidDecl(); 4035 } 4036 4037 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4038 4039 // This is an explicit specialization of a static data member. Check it. 4040 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4041 CheckMemberSpecialization(NewVD, Previous)) 4042 NewVD->setInvalidDecl(); 4043 } 4044 4045 // attributes declared post-definition are currently ignored 4046 // FIXME: This should be handled in attribute merging, not 4047 // here. 4048 if (Previous.isSingleResult()) { 4049 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4050 if (Def && (Def = Def->getDefinition()) && 4051 Def != NewVD && D.hasAttributes()) { 4052 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4053 Diag(Def->getLocation(), diag::note_previous_definition); 4054 } 4055 } 4056 4057 // If this is a locally-scoped extern C variable, update the map of 4058 // such variables. 4059 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4060 !NewVD->isInvalidDecl()) 4061 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4062 4063 // If there's a #pragma GCC visibility in scope, and this isn't a class 4064 // member, set the visibility of this variable. 4065 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4066 AddPushedVisibilityAttribute(NewVD); 4067 4068 MarkUnusedFileScopedDecl(NewVD); 4069 4070 return NewVD; 4071} 4072 4073/// \brief Diagnose variable or built-in function shadowing. Implements 4074/// -Wshadow. 4075/// 4076/// This method is called whenever a VarDecl is added to a "useful" 4077/// scope. 4078/// 4079/// \param S the scope in which the shadowing name is being declared 4080/// \param R the lookup of the name 4081/// 4082void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4083 // Return if warning is ignored. 4084 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4085 DiagnosticsEngine::Ignored) 4086 return; 4087 4088 // Don't diagnose declarations at file scope. 4089 if (D->hasGlobalStorage()) 4090 return; 4091 4092 DeclContext *NewDC = D->getDeclContext(); 4093 4094 // Only diagnose if we're shadowing an unambiguous field or variable. 4095 if (R.getResultKind() != LookupResult::Found) 4096 return; 4097 4098 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4099 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4100 return; 4101 4102 // Fields are not shadowed by variables in C++ static methods. 4103 if (isa<FieldDecl>(ShadowedDecl)) 4104 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4105 if (MD->isStatic()) 4106 return; 4107 4108 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4109 if (shadowedVar->isExternC()) { 4110 // For shadowing external vars, make sure that we point to the global 4111 // declaration, not a locally scoped extern declaration. 4112 for (VarDecl::redecl_iterator 4113 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4114 I != E; ++I) 4115 if (I->isFileVarDecl()) { 4116 ShadowedDecl = *I; 4117 break; 4118 } 4119 } 4120 4121 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4122 4123 // Only warn about certain kinds of shadowing for class members. 4124 if (NewDC && NewDC->isRecord()) { 4125 // In particular, don't warn about shadowing non-class members. 4126 if (!OldDC->isRecord()) 4127 return; 4128 4129 // TODO: should we warn about static data members shadowing 4130 // static data members from base classes? 4131 4132 // TODO: don't diagnose for inaccessible shadowed members. 4133 // This is hard to do perfectly because we might friend the 4134 // shadowing context, but that's just a false negative. 4135 } 4136 4137 // Determine what kind of declaration we're shadowing. 4138 unsigned Kind; 4139 if (isa<RecordDecl>(OldDC)) { 4140 if (isa<FieldDecl>(ShadowedDecl)) 4141 Kind = 3; // field 4142 else 4143 Kind = 2; // static data member 4144 } else if (OldDC->isFileContext()) 4145 Kind = 1; // global 4146 else 4147 Kind = 0; // local 4148 4149 DeclarationName Name = R.getLookupName(); 4150 4151 // Emit warning and note. 4152 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4153 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4154} 4155 4156/// \brief Check -Wshadow without the advantage of a previous lookup. 4157void Sema::CheckShadow(Scope *S, VarDecl *D) { 4158 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4159 DiagnosticsEngine::Ignored) 4160 return; 4161 4162 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4163 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4164 LookupName(R, S); 4165 CheckShadow(S, D, R); 4166} 4167 4168/// \brief Perform semantic checking on a newly-created variable 4169/// declaration. 4170/// 4171/// This routine performs all of the type-checking required for a 4172/// variable declaration once it has been built. It is used both to 4173/// check variables after they have been parsed and their declarators 4174/// have been translated into a declaration, and to check variables 4175/// that have been instantiated from a template. 4176/// 4177/// Sets NewVD->isInvalidDecl() if an error was encountered. 4178/// 4179/// Returns true if the variable declaration is a redeclaration. 4180bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4181 LookupResult &Previous) { 4182 // If the decl is already known invalid, don't check it. 4183 if (NewVD->isInvalidDecl()) 4184 return false; 4185 4186 QualType T = NewVD->getType(); 4187 4188 if (T->isObjCObjectType()) { 4189 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4190 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4191 T = Context.getObjCObjectPointerType(T); 4192 NewVD->setType(T); 4193 } 4194 4195 // Emit an error if an address space was applied to decl with local storage. 4196 // This includes arrays of objects with address space qualifiers, but not 4197 // automatic variables that point to other address spaces. 4198 // ISO/IEC TR 18037 S5.1.2 4199 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4200 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4201 NewVD->setInvalidDecl(); 4202 return false; 4203 } 4204 4205 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4206 && !NewVD->hasAttr<BlocksAttr>()) { 4207 if (getLangOptions().getGC() != LangOptions::NonGC) 4208 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4209 else 4210 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4211 } 4212 4213 bool isVM = T->isVariablyModifiedType(); 4214 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4215 NewVD->hasAttr<BlocksAttr>()) 4216 getCurFunction()->setHasBranchProtectedScope(); 4217 4218 if ((isVM && NewVD->hasLinkage()) || 4219 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4220 bool SizeIsNegative; 4221 llvm::APSInt Oversized; 4222 QualType FixedTy = 4223 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4224 Oversized); 4225 4226 if (FixedTy.isNull() && T->isVariableArrayType()) { 4227 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4228 // FIXME: This won't give the correct result for 4229 // int a[10][n]; 4230 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4231 4232 if (NewVD->isFileVarDecl()) 4233 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4234 << SizeRange; 4235 else if (NewVD->getStorageClass() == SC_Static) 4236 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4237 << SizeRange; 4238 else 4239 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4240 << SizeRange; 4241 NewVD->setInvalidDecl(); 4242 return false; 4243 } 4244 4245 if (FixedTy.isNull()) { 4246 if (NewVD->isFileVarDecl()) 4247 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4248 else 4249 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4250 NewVD->setInvalidDecl(); 4251 return false; 4252 } 4253 4254 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4255 NewVD->setType(FixedTy); 4256 } 4257 4258 if (Previous.empty() && NewVD->isExternC()) { 4259 // Since we did not find anything by this name and we're declaring 4260 // an extern "C" variable, look for a non-visible extern "C" 4261 // declaration with the same name. 4262 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4263 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4264 if (Pos != LocallyScopedExternalDecls.end()) 4265 Previous.addDecl(Pos->second); 4266 } 4267 4268 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4269 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4270 << T; 4271 NewVD->setInvalidDecl(); 4272 return false; 4273 } 4274 4275 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4276 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4277 NewVD->setInvalidDecl(); 4278 return false; 4279 } 4280 4281 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4282 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4283 NewVD->setInvalidDecl(); 4284 return false; 4285 } 4286 4287 // Function pointers and references cannot have qualified function type, only 4288 // function pointer-to-members can do that. 4289 QualType Pointee; 4290 unsigned PtrOrRef = 0; 4291 if (const PointerType *Ptr = T->getAs<PointerType>()) 4292 Pointee = Ptr->getPointeeType(); 4293 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4294 Pointee = Ref->getPointeeType(); 4295 PtrOrRef = 1; 4296 } 4297 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4298 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4299 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4300 << PtrOrRef; 4301 NewVD->setInvalidDecl(); 4302 return false; 4303 } 4304 4305 if (!Previous.empty()) { 4306 MergeVarDecl(NewVD, Previous); 4307 return true; 4308 } 4309 return false; 4310} 4311 4312/// \brief Data used with FindOverriddenMethod 4313struct FindOverriddenMethodData { 4314 Sema *S; 4315 CXXMethodDecl *Method; 4316}; 4317 4318/// \brief Member lookup function that determines whether a given C++ 4319/// method overrides a method in a base class, to be used with 4320/// CXXRecordDecl::lookupInBases(). 4321static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4322 CXXBasePath &Path, 4323 void *UserData) { 4324 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4325 4326 FindOverriddenMethodData *Data 4327 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4328 4329 DeclarationName Name = Data->Method->getDeclName(); 4330 4331 // FIXME: Do we care about other names here too? 4332 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4333 // We really want to find the base class destructor here. 4334 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4335 CanQualType CT = Data->S->Context.getCanonicalType(T); 4336 4337 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4338 } 4339 4340 for (Path.Decls = BaseRecord->lookup(Name); 4341 Path.Decls.first != Path.Decls.second; 4342 ++Path.Decls.first) { 4343 NamedDecl *D = *Path.Decls.first; 4344 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4345 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4346 return true; 4347 } 4348 } 4349 4350 return false; 4351} 4352 4353/// AddOverriddenMethods - See if a method overrides any in the base classes, 4354/// and if so, check that it's a valid override and remember it. 4355bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4356 // Look for virtual methods in base classes that this method might override. 4357 CXXBasePaths Paths; 4358 FindOverriddenMethodData Data; 4359 Data.Method = MD; 4360 Data.S = this; 4361 bool AddedAny = false; 4362 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4363 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4364 E = Paths.found_decls_end(); I != E; ++I) { 4365 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4366 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4367 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4368 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4369 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4370 AddedAny = true; 4371 } 4372 } 4373 } 4374 } 4375 4376 return AddedAny; 4377} 4378 4379namespace { 4380 // Struct for holding all of the extra arguments needed by 4381 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4382 struct ActOnFDArgs { 4383 Scope *S; 4384 Declarator &D; 4385 MultiTemplateParamsArg TemplateParamLists; 4386 bool AddToScope; 4387 }; 4388} 4389 4390/// \brief Generate diagnostics for an invalid function redeclaration. 4391/// 4392/// This routine handles generating the diagnostic messages for an invalid 4393/// function redeclaration, including finding possible similar declarations 4394/// or performing typo correction if there are no previous declarations with 4395/// the same name. 4396/// 4397/// Returns a NamedDecl iff typo correction was performed and substituting in 4398/// the new declaration name does not cause new errors. 4399static NamedDecl* DiagnoseInvalidRedeclaration( 4400 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4401 ActOnFDArgs &ExtraArgs) { 4402 NamedDecl *Result = NULL; 4403 DeclarationName Name = NewFD->getDeclName(); 4404 DeclContext *NewDC = NewFD->getDeclContext(); 4405 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4406 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4407 llvm::SmallVector<unsigned, 1> MismatchedParams; 4408 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4409 TypoCorrection Correction; 4410 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4411 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4412 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4413 : diag::err_member_def_does_not_match; 4414 4415 NewFD->setInvalidDecl(); 4416 SemaRef.LookupQualifiedName(Prev, NewDC); 4417 assert(!Prev.isAmbiguous() && 4418 "Cannot have an ambiguity in previous-declaration lookup"); 4419 if (!Prev.empty()) { 4420 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4421 Func != FuncEnd; ++Func) { 4422 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4423 if (FD && 4424 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4425 // Add 1 to the index so that 0 can mean the mismatch didn't 4426 // involve a parameter 4427 unsigned ParamNum = 4428 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4429 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4430 } 4431 } 4432 // If the qualified name lookup yielded nothing, try typo correction 4433 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4434 Prev.getLookupKind(), 0, 0, NewDC)) && 4435 Correction.getCorrection() != Name) { 4436 // Trap errors. 4437 Sema::SFINAETrap Trap(SemaRef); 4438 4439 // Set up everything for the call to ActOnFunctionDeclarator 4440 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4441 ExtraArgs.D.getIdentifierLoc()); 4442 Previous.clear(); 4443 Previous.setLookupName(Correction.getCorrection()); 4444 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4445 CDeclEnd = Correction.end(); 4446 CDecl != CDeclEnd; ++CDecl) { 4447 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4448 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4449 MismatchedParams)) { 4450 Previous.addDecl(FD); 4451 } 4452 } 4453 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4454 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4455 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4456 // eliminate the need for the parameter pack ExtraArgs. 4457 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4458 NewFD->getDeclContext(), 4459 NewFD->getTypeSourceInfo(), 4460 Previous, 4461 ExtraArgs.TemplateParamLists, 4462 ExtraArgs.AddToScope); 4463 if (Trap.hasErrorOccurred()) { 4464 // Pretend the typo correction never occurred 4465 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4466 ExtraArgs.D.getIdentifierLoc()); 4467 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4468 Previous.clear(); 4469 Previous.setLookupName(Name); 4470 Result = NULL; 4471 } else { 4472 for (LookupResult::iterator Func = Previous.begin(), 4473 FuncEnd = Previous.end(); 4474 Func != FuncEnd; ++Func) { 4475 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4476 NearMatches.push_back(std::make_pair(FD, 0)); 4477 } 4478 } 4479 if (NearMatches.empty()) { 4480 // Ignore the correction if it didn't yield any close FunctionDecl matches 4481 Correction = TypoCorrection(); 4482 } else { 4483 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4484 : diag::err_member_def_does_not_match_suggest; 4485 } 4486 } 4487 4488 if (Correction) 4489 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4490 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4491 << FixItHint::CreateReplacement( 4492 NewFD->getLocation(), 4493 Correction.getAsString(SemaRef.getLangOptions())); 4494 else 4495 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4496 << Name << NewDC << NewFD->getLocation(); 4497 4498 bool NewFDisConst = false; 4499 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4500 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4501 4502 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4503 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4504 NearMatch != NearMatchEnd; ++NearMatch) { 4505 FunctionDecl *FD = NearMatch->first; 4506 bool FDisConst = false; 4507 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4508 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4509 4510 if (unsigned Idx = NearMatch->second) { 4511 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4512 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4513 diag::note_member_def_close_param_match) 4514 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4515 } else if (Correction) { 4516 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4517 << Correction.getQuoted(SemaRef.getLangOptions()); 4518 } else if (FDisConst != NewFDisConst) { 4519 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4520 << NewFDisConst << FD->getSourceRange().getEnd(); 4521 } else 4522 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4523 } 4524 return Result; 4525} 4526 4527static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4528 Declarator &D) { 4529 switch (D.getDeclSpec().getStorageClassSpec()) { 4530 default: llvm_unreachable("Unknown storage class!"); 4531 case DeclSpec::SCS_auto: 4532 case DeclSpec::SCS_register: 4533 case DeclSpec::SCS_mutable: 4534 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4535 diag::err_typecheck_sclass_func); 4536 D.setInvalidType(); 4537 break; 4538 case DeclSpec::SCS_unspecified: break; 4539 case DeclSpec::SCS_extern: return SC_Extern; 4540 case DeclSpec::SCS_static: { 4541 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4542 // C99 6.7.1p5: 4543 // The declaration of an identifier for a function that has 4544 // block scope shall have no explicit storage-class specifier 4545 // other than extern 4546 // See also (C++ [dcl.stc]p4). 4547 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4548 diag::err_static_block_func); 4549 break; 4550 } else 4551 return SC_Static; 4552 } 4553 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4554 } 4555 4556 // No explicit storage class has already been returned 4557 return SC_None; 4558} 4559 4560static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4561 DeclContext *DC, QualType &R, 4562 TypeSourceInfo *TInfo, 4563 FunctionDecl::StorageClass SC, 4564 bool &IsVirtualOkay) { 4565 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4566 DeclarationName Name = NameInfo.getName(); 4567 4568 FunctionDecl *NewFD = 0; 4569 bool isInline = D.getDeclSpec().isInlineSpecified(); 4570 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4571 FunctionDecl::StorageClass SCAsWritten 4572 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4573 4574 if (!SemaRef.getLangOptions().CPlusPlus) { 4575 // Determine whether the function was written with a 4576 // prototype. This true when: 4577 // - there is a prototype in the declarator, or 4578 // - the type R of the function is some kind of typedef or other reference 4579 // to a type name (which eventually refers to a function type). 4580 bool HasPrototype = 4581 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4582 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4583 4584 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4585 D.getSourceRange().getBegin(), NameInfo, R, 4586 TInfo, SC, SCAsWritten, isInline, 4587 HasPrototype); 4588 if (D.isInvalidType()) 4589 NewFD->setInvalidDecl(); 4590 4591 // Set the lexical context. 4592 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4593 4594 return NewFD; 4595 } 4596 4597 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4598 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4599 4600 // Check that the return type is not an abstract class type. 4601 // For record types, this is done by the AbstractClassUsageDiagnoser once 4602 // the class has been completely parsed. 4603 if (!DC->isRecord() && 4604 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4605 R->getAs<FunctionType>()->getResultType(), 4606 diag::err_abstract_type_in_decl, 4607 SemaRef.AbstractReturnType)) 4608 D.setInvalidType(); 4609 4610 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4611 // This is a C++ constructor declaration. 4612 assert(DC->isRecord() && 4613 "Constructors can only be declared in a member context"); 4614 4615 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4616 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4617 D.getSourceRange().getBegin(), NameInfo, 4618 R, TInfo, isExplicit, isInline, 4619 /*isImplicitlyDeclared=*/false, 4620 isConstexpr); 4621 4622 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4623 // This is a C++ destructor declaration. 4624 if (DC->isRecord()) { 4625 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4626 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4627 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4628 SemaRef.Context, Record, 4629 D.getSourceRange().getBegin(), 4630 NameInfo, R, TInfo, isInline, 4631 /*isImplicitlyDeclared=*/false); 4632 4633 // If the class is complete, then we now create the implicit exception 4634 // specification. If the class is incomplete or dependent, we can't do 4635 // it yet. 4636 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4637 Record->getDefinition() && !Record->isBeingDefined() && 4638 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4639 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4640 } 4641 4642 IsVirtualOkay = true; 4643 return NewDD; 4644 4645 } else { 4646 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4647 D.setInvalidType(); 4648 4649 // Create a FunctionDecl to satisfy the function definition parsing 4650 // code path. 4651 return FunctionDecl::Create(SemaRef.Context, DC, 4652 D.getSourceRange().getBegin(), 4653 D.getIdentifierLoc(), Name, R, TInfo, 4654 SC, SCAsWritten, isInline, 4655 /*hasPrototype=*/true, isConstexpr); 4656 } 4657 4658 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4659 if (!DC->isRecord()) { 4660 SemaRef.Diag(D.getIdentifierLoc(), 4661 diag::err_conv_function_not_member); 4662 return 0; 4663 } 4664 4665 SemaRef.CheckConversionDeclarator(D, R, SC); 4666 IsVirtualOkay = true; 4667 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4668 D.getSourceRange().getBegin(), NameInfo, 4669 R, TInfo, isInline, isExplicit, 4670 isConstexpr, SourceLocation()); 4671 4672 } else if (DC->isRecord()) { 4673 // If the name of the function is the same as the name of the record, 4674 // then this must be an invalid constructor that has a return type. 4675 // (The parser checks for a return type and makes the declarator a 4676 // constructor if it has no return type). 4677 if (Name.getAsIdentifierInfo() && 4678 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4679 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4680 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4681 << SourceRange(D.getIdentifierLoc()); 4682 return 0; 4683 } 4684 4685 bool isStatic = SC == SC_Static; 4686 4687 // [class.free]p1: 4688 // Any allocation function for a class T is a static member 4689 // (even if not explicitly declared static). 4690 if (Name.getCXXOverloadedOperator() == OO_New || 4691 Name.getCXXOverloadedOperator() == OO_Array_New) 4692 isStatic = true; 4693 4694 // [class.free]p6 Any deallocation function for a class X is a static member 4695 // (even if not explicitly declared static). 4696 if (Name.getCXXOverloadedOperator() == OO_Delete || 4697 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4698 isStatic = true; 4699 4700 IsVirtualOkay = !isStatic; 4701 4702 // This is a C++ method declaration. 4703 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4704 D.getSourceRange().getBegin(), NameInfo, R, 4705 TInfo, isStatic, SCAsWritten, isInline, 4706 isConstexpr, SourceLocation()); 4707 4708 } else { 4709 // Determine whether the function was written with a 4710 // prototype. This true when: 4711 // - we're in C++ (where every function has a prototype), 4712 return FunctionDecl::Create(SemaRef.Context, DC, 4713 D.getSourceRange().getBegin(), 4714 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4715 true/*HasPrototype*/, isConstexpr); 4716 } 4717} 4718 4719NamedDecl* 4720Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4721 TypeSourceInfo *TInfo, LookupResult &Previous, 4722 MultiTemplateParamsArg TemplateParamLists, 4723 bool &AddToScope) { 4724 QualType R = TInfo->getType(); 4725 4726 assert(R.getTypePtr()->isFunctionType()); 4727 4728 // TODO: consider using NameInfo for diagnostic. 4729 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4730 DeclarationName Name = NameInfo.getName(); 4731 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4732 4733 if (D.getDeclSpec().isThreadSpecified()) 4734 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4735 4736 // Do not allow returning a objc interface by-value. 4737 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4738 Diag(D.getIdentifierLoc(), 4739 diag::err_object_cannot_be_passed_returned_by_value) << 0 4740 << R->getAs<FunctionType>()->getResultType() 4741 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4742 4743 QualType T = R->getAs<FunctionType>()->getResultType(); 4744 T = Context.getObjCObjectPointerType(T); 4745 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4746 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4747 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4748 FPT->getNumArgs(), EPI); 4749 } 4750 else if (isa<FunctionNoProtoType>(R)) 4751 R = Context.getFunctionNoProtoType(T); 4752 } 4753 4754 bool isFriend = false; 4755 FunctionTemplateDecl *FunctionTemplate = 0; 4756 bool isExplicitSpecialization = false; 4757 bool isFunctionTemplateSpecialization = false; 4758 bool isDependentClassScopeExplicitSpecialization = false; 4759 bool isVirtualOkay = false; 4760 4761 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4762 isVirtualOkay); 4763 if (!NewFD) return 0; 4764 4765 if (getLangOptions().CPlusPlus) { 4766 bool isInline = D.getDeclSpec().isInlineSpecified(); 4767 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4768 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4769 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4770 isFriend = D.getDeclSpec().isFriendSpecified(); 4771 if (isFriend && !isInline && D.isFunctionDefinition()) { 4772 // C++ [class.friend]p5 4773 // A function can be defined in a friend declaration of a 4774 // class . . . . Such a function is implicitly inline. 4775 NewFD->setImplicitlyInline(); 4776 } 4777 4778 SetNestedNameSpecifier(NewFD, D); 4779 isExplicitSpecialization = false; 4780 isFunctionTemplateSpecialization = false; 4781 if (D.isInvalidType()) 4782 NewFD->setInvalidDecl(); 4783 4784 // Set the lexical context. If the declarator has a C++ 4785 // scope specifier, or is the object of a friend declaration, the 4786 // lexical context will be different from the semantic context. 4787 NewFD->setLexicalDeclContext(CurContext); 4788 4789 // Match up the template parameter lists with the scope specifier, then 4790 // determine whether we have a template or a template specialization. 4791 bool Invalid = false; 4792 if (TemplateParameterList *TemplateParams 4793 = MatchTemplateParametersToScopeSpecifier( 4794 D.getDeclSpec().getSourceRange().getBegin(), 4795 D.getIdentifierLoc(), 4796 D.getCXXScopeSpec(), 4797 TemplateParamLists.get(), 4798 TemplateParamLists.size(), 4799 isFriend, 4800 isExplicitSpecialization, 4801 Invalid)) { 4802 if (TemplateParams->size() > 0) { 4803 // This is a function template 4804 4805 // Check that we can declare a template here. 4806 if (CheckTemplateDeclScope(S, TemplateParams)) 4807 return 0; 4808 4809 // A destructor cannot be a template. 4810 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4811 Diag(NewFD->getLocation(), diag::err_destructor_template); 4812 return 0; 4813 } 4814 4815 // If we're adding a template to a dependent context, we may need to 4816 // rebuilding some of the types used within the template parameter list, 4817 // now that we know what the current instantiation is. 4818 if (DC->isDependentContext()) { 4819 ContextRAII SavedContext(*this, DC); 4820 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4821 Invalid = true; 4822 } 4823 4824 4825 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4826 NewFD->getLocation(), 4827 Name, TemplateParams, 4828 NewFD); 4829 FunctionTemplate->setLexicalDeclContext(CurContext); 4830 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4831 4832 // For source fidelity, store the other template param lists. 4833 if (TemplateParamLists.size() > 1) { 4834 NewFD->setTemplateParameterListsInfo(Context, 4835 TemplateParamLists.size() - 1, 4836 TemplateParamLists.release()); 4837 } 4838 } else { 4839 // This is a function template specialization. 4840 isFunctionTemplateSpecialization = true; 4841 // For source fidelity, store all the template param lists. 4842 NewFD->setTemplateParameterListsInfo(Context, 4843 TemplateParamLists.size(), 4844 TemplateParamLists.release()); 4845 4846 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4847 if (isFriend) { 4848 // We want to remove the "template<>", found here. 4849 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4850 4851 // If we remove the template<> and the name is not a 4852 // template-id, we're actually silently creating a problem: 4853 // the friend declaration will refer to an untemplated decl, 4854 // and clearly the user wants a template specialization. So 4855 // we need to insert '<>' after the name. 4856 SourceLocation InsertLoc; 4857 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4858 InsertLoc = D.getName().getSourceRange().getEnd(); 4859 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4860 } 4861 4862 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4863 << Name << RemoveRange 4864 << FixItHint::CreateRemoval(RemoveRange) 4865 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4866 } 4867 } 4868 } 4869 else { 4870 // All template param lists were matched against the scope specifier: 4871 // this is NOT (an explicit specialization of) a template. 4872 if (TemplateParamLists.size() > 0) 4873 // For source fidelity, store all the template param lists. 4874 NewFD->setTemplateParameterListsInfo(Context, 4875 TemplateParamLists.size(), 4876 TemplateParamLists.release()); 4877 } 4878 4879 if (Invalid) { 4880 NewFD->setInvalidDecl(); 4881 if (FunctionTemplate) 4882 FunctionTemplate->setInvalidDecl(); 4883 } 4884 4885 // C++ [dcl.fct.spec]p5: 4886 // The virtual specifier shall only be used in declarations of 4887 // nonstatic class member functions that appear within a 4888 // member-specification of a class declaration; see 10.3. 4889 // 4890 if (isVirtual && !NewFD->isInvalidDecl()) { 4891 if (!isVirtualOkay) { 4892 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4893 diag::err_virtual_non_function); 4894 } else if (!CurContext->isRecord()) { 4895 // 'virtual' was specified outside of the class. 4896 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4897 diag::err_virtual_out_of_class) 4898 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4899 } else if (NewFD->getDescribedFunctionTemplate()) { 4900 // C++ [temp.mem]p3: 4901 // A member function template shall not be virtual. 4902 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4903 diag::err_virtual_member_function_template) 4904 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4905 } else { 4906 // Okay: Add virtual to the method. 4907 NewFD->setVirtualAsWritten(true); 4908 } 4909 } 4910 4911 // C++ [dcl.fct.spec]p3: 4912 // The inline specifier shall not appear on a block scope function 4913 // declaration. 4914 if (isInline && !NewFD->isInvalidDecl()) { 4915 if (CurContext->isFunctionOrMethod()) { 4916 // 'inline' is not allowed on block scope function declaration. 4917 Diag(D.getDeclSpec().getInlineSpecLoc(), 4918 diag::err_inline_declaration_block_scope) << Name 4919 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4920 } 4921 } 4922 4923 // C++ [dcl.fct.spec]p6: 4924 // The explicit specifier shall be used only in the declaration of a 4925 // constructor or conversion function within its class definition; 4926 // see 12.3.1 and 12.3.2. 4927 if (isExplicit && !NewFD->isInvalidDecl()) { 4928 if (!CurContext->isRecord()) { 4929 // 'explicit' was specified outside of the class. 4930 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4931 diag::err_explicit_out_of_class) 4932 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4933 } else if (!isa<CXXConstructorDecl>(NewFD) && 4934 !isa<CXXConversionDecl>(NewFD)) { 4935 // 'explicit' was specified on a function that wasn't a constructor 4936 // or conversion function. 4937 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4938 diag::err_explicit_non_ctor_or_conv_function) 4939 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4940 } 4941 } 4942 4943 if (isConstexpr) { 4944 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4945 // are implicitly inline. 4946 NewFD->setImplicitlyInline(); 4947 4948 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4949 // be either constructors or to return a literal type. Therefore, 4950 // destructors cannot be declared constexpr. 4951 if (isa<CXXDestructorDecl>(NewFD)) 4952 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 4953 } 4954 4955 // If __module_private__ was specified, mark the function accordingly. 4956 if (D.getDeclSpec().isModulePrivateSpecified()) { 4957 if (isFunctionTemplateSpecialization) { 4958 SourceLocation ModulePrivateLoc 4959 = D.getDeclSpec().getModulePrivateSpecLoc(); 4960 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4961 << 0 4962 << FixItHint::CreateRemoval(ModulePrivateLoc); 4963 } else { 4964 NewFD->setModulePrivate(); 4965 if (FunctionTemplate) 4966 FunctionTemplate->setModulePrivate(); 4967 } 4968 } 4969 4970 if (isFriend) { 4971 // For now, claim that the objects have no previous declaration. 4972 if (FunctionTemplate) { 4973 FunctionTemplate->setObjectOfFriendDecl(false); 4974 FunctionTemplate->setAccess(AS_public); 4975 } 4976 NewFD->setObjectOfFriendDecl(false); 4977 NewFD->setAccess(AS_public); 4978 } 4979 4980 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 4981 D.isFunctionDefinition()) { 4982 // A method is implicitly inline if it's defined in its class 4983 // definition. 4984 NewFD->setImplicitlyInline(); 4985 } 4986 4987 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4988 !CurContext->isRecord()) { 4989 // C++ [class.static]p1: 4990 // A data or function member of a class may be declared static 4991 // in a class definition, in which case it is a static member of 4992 // the class. 4993 4994 // Complain about the 'static' specifier if it's on an out-of-line 4995 // member function definition. 4996 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4997 diag::err_static_out_of_line) 4998 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4999 } 5000 } 5001 5002 // Filter out previous declarations that don't match the scope. 5003 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5004 isExplicitSpecialization || 5005 isFunctionTemplateSpecialization); 5006 5007 // Handle GNU asm-label extension (encoded as an attribute). 5008 if (Expr *E = (Expr*) D.getAsmLabel()) { 5009 // The parser guarantees this is a string. 5010 StringLiteral *SE = cast<StringLiteral>(E); 5011 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5012 SE->getString())); 5013 } 5014 5015 // Copy the parameter declarations from the declarator D to the function 5016 // declaration NewFD, if they are available. First scavenge them into Params. 5017 SmallVector<ParmVarDecl*, 16> Params; 5018 if (D.isFunctionDeclarator()) { 5019 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5020 5021 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5022 // function that takes no arguments, not a function that takes a 5023 // single void argument. 5024 // We let through "const void" here because Sema::GetTypeForDeclarator 5025 // already checks for that case. 5026 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5027 FTI.ArgInfo[0].Param && 5028 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5029 // Empty arg list, don't push any params. 5030 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5031 5032 // In C++, the empty parameter-type-list must be spelled "void"; a 5033 // typedef of void is not permitted. 5034 if (getLangOptions().CPlusPlus && 5035 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5036 bool IsTypeAlias = false; 5037 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5038 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5039 else if (const TemplateSpecializationType *TST = 5040 Param->getType()->getAs<TemplateSpecializationType>()) 5041 IsTypeAlias = TST->isTypeAlias(); 5042 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5043 << IsTypeAlias; 5044 } 5045 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5046 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5047 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5048 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5049 Param->setDeclContext(NewFD); 5050 Params.push_back(Param); 5051 5052 if (Param->isInvalidDecl()) 5053 NewFD->setInvalidDecl(); 5054 } 5055 } 5056 5057 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5058 // When we're declaring a function with a typedef, typeof, etc as in the 5059 // following example, we'll need to synthesize (unnamed) 5060 // parameters for use in the declaration. 5061 // 5062 // @code 5063 // typedef void fn(int); 5064 // fn f; 5065 // @endcode 5066 5067 // Synthesize a parameter for each argument type. 5068 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5069 AE = FT->arg_type_end(); AI != AE; ++AI) { 5070 ParmVarDecl *Param = 5071 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5072 Param->setScopeInfo(0, Params.size()); 5073 Params.push_back(Param); 5074 } 5075 } else { 5076 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5077 "Should not need args for typedef of non-prototype fn"); 5078 } 5079 5080 // Finally, we know we have the right number of parameters, install them. 5081 NewFD->setParams(Params); 5082 5083 // Process the non-inheritable attributes on this declaration. 5084 ProcessDeclAttributes(S, NewFD, D, 5085 /*NonInheritable=*/true, /*Inheritable=*/false); 5086 5087 if (!getLangOptions().CPlusPlus) { 5088 // Perform semantic checking on the function declaration. 5089 bool isExplicitSpecialization=false; 5090 if (!NewFD->isInvalidDecl()) { 5091 if (NewFD->getResultType()->isVariablyModifiedType()) { 5092 // Functions returning a variably modified type violate C99 6.7.5.2p2 5093 // because all functions have linkage. 5094 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5095 NewFD->setInvalidDecl(); 5096 } else { 5097 if (NewFD->isMain()) 5098 CheckMain(NewFD, D.getDeclSpec()); 5099 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5100 isExplicitSpecialization)); 5101 } 5102 } 5103 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5104 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5105 "previous declaration set still overloaded"); 5106 } else { 5107 // If the declarator is a template-id, translate the parser's template 5108 // argument list into our AST format. 5109 bool HasExplicitTemplateArgs = false; 5110 TemplateArgumentListInfo TemplateArgs; 5111 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5112 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5113 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5114 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5115 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5116 TemplateId->getTemplateArgs(), 5117 TemplateId->NumArgs); 5118 translateTemplateArguments(TemplateArgsPtr, 5119 TemplateArgs); 5120 TemplateArgsPtr.release(); 5121 5122 HasExplicitTemplateArgs = true; 5123 5124 if (NewFD->isInvalidDecl()) { 5125 HasExplicitTemplateArgs = false; 5126 } else if (FunctionTemplate) { 5127 // Function template with explicit template arguments. 5128 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5129 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5130 5131 HasExplicitTemplateArgs = false; 5132 } else if (!isFunctionTemplateSpecialization && 5133 !D.getDeclSpec().isFriendSpecified()) { 5134 // We have encountered something that the user meant to be a 5135 // specialization (because it has explicitly-specified template 5136 // arguments) but that was not introduced with a "template<>" (or had 5137 // too few of them). 5138 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5139 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5140 << FixItHint::CreateInsertion( 5141 D.getDeclSpec().getSourceRange().getBegin(), 5142 "template<> "); 5143 isFunctionTemplateSpecialization = true; 5144 } else { 5145 // "friend void foo<>(int);" is an implicit specialization decl. 5146 isFunctionTemplateSpecialization = true; 5147 } 5148 } else if (isFriend && isFunctionTemplateSpecialization) { 5149 // This combination is only possible in a recovery case; the user 5150 // wrote something like: 5151 // template <> friend void foo(int); 5152 // which we're recovering from as if the user had written: 5153 // friend void foo<>(int); 5154 // Go ahead and fake up a template id. 5155 HasExplicitTemplateArgs = true; 5156 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5157 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5158 } 5159 5160 // If it's a friend (and only if it's a friend), it's possible 5161 // that either the specialized function type or the specialized 5162 // template is dependent, and therefore matching will fail. In 5163 // this case, don't check the specialization yet. 5164 bool InstantiationDependent = false; 5165 if (isFunctionTemplateSpecialization && isFriend && 5166 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5167 TemplateSpecializationType::anyDependentTemplateArguments( 5168 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5169 InstantiationDependent))) { 5170 assert(HasExplicitTemplateArgs && 5171 "friend function specialization without template args"); 5172 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5173 Previous)) 5174 NewFD->setInvalidDecl(); 5175 } else if (isFunctionTemplateSpecialization) { 5176 if (CurContext->isDependentContext() && CurContext->isRecord() 5177 && !isFriend) { 5178 isDependentClassScopeExplicitSpecialization = true; 5179 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5180 diag::ext_function_specialization_in_class : 5181 diag::err_function_specialization_in_class) 5182 << NewFD->getDeclName(); 5183 } else if (CheckFunctionTemplateSpecialization(NewFD, 5184 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5185 Previous)) 5186 NewFD->setInvalidDecl(); 5187 5188 // C++ [dcl.stc]p1: 5189 // A storage-class-specifier shall not be specified in an explicit 5190 // specialization (14.7.3) 5191 if (SC != SC_None) { 5192 if (SC != NewFD->getStorageClass()) 5193 Diag(NewFD->getLocation(), 5194 diag::err_explicit_specialization_inconsistent_storage_class) 5195 << SC 5196 << FixItHint::CreateRemoval( 5197 D.getDeclSpec().getStorageClassSpecLoc()); 5198 5199 else 5200 Diag(NewFD->getLocation(), 5201 diag::ext_explicit_specialization_storage_class) 5202 << FixItHint::CreateRemoval( 5203 D.getDeclSpec().getStorageClassSpecLoc()); 5204 } 5205 5206 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5207 if (CheckMemberSpecialization(NewFD, Previous)) 5208 NewFD->setInvalidDecl(); 5209 } 5210 5211 // Perform semantic checking on the function declaration. 5212 if (!isDependentClassScopeExplicitSpecialization) { 5213 if (NewFD->isInvalidDecl()) { 5214 // If this is a class member, mark the class invalid immediately. 5215 // This avoids some consistency errors later. 5216 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5217 methodDecl->getParent()->setInvalidDecl(); 5218 } else { 5219 if (NewFD->isMain()) 5220 CheckMain(NewFD, D.getDeclSpec()); 5221 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5222 isExplicitSpecialization)); 5223 } 5224 } 5225 5226 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5227 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5228 "previous declaration set still overloaded"); 5229 5230 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5231 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5232 NewFD->setInvalidDecl(); 5233 5234 NamedDecl *PrincipalDecl = (FunctionTemplate 5235 ? cast<NamedDecl>(FunctionTemplate) 5236 : NewFD); 5237 5238 if (isFriend && D.isRedeclaration()) { 5239 AccessSpecifier Access = AS_public; 5240 if (!NewFD->isInvalidDecl()) 5241 Access = NewFD->getPreviousDeclaration()->getAccess(); 5242 5243 NewFD->setAccess(Access); 5244 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5245 5246 PrincipalDecl->setObjectOfFriendDecl(true); 5247 } 5248 5249 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5250 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5251 PrincipalDecl->setNonMemberOperator(); 5252 5253 // If we have a function template, check the template parameter 5254 // list. This will check and merge default template arguments. 5255 if (FunctionTemplate) { 5256 FunctionTemplateDecl *PrevTemplate = 5257 FunctionTemplate->getPreviousDeclaration(); 5258 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5259 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5260 D.getDeclSpec().isFriendSpecified() 5261 ? (D.isFunctionDefinition() 5262 ? TPC_FriendFunctionTemplateDefinition 5263 : TPC_FriendFunctionTemplate) 5264 : (D.getCXXScopeSpec().isSet() && 5265 DC && DC->isRecord() && 5266 DC->isDependentContext()) 5267 ? TPC_ClassTemplateMember 5268 : TPC_FunctionTemplate); 5269 } 5270 5271 if (NewFD->isInvalidDecl()) { 5272 // Ignore all the rest of this. 5273 } else if (!D.isRedeclaration()) { 5274 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5275 AddToScope }; 5276 // Fake up an access specifier if it's supposed to be a class member. 5277 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5278 NewFD->setAccess(AS_public); 5279 5280 // Qualified decls generally require a previous declaration. 5281 if (D.getCXXScopeSpec().isSet()) { 5282 // ...with the major exception of templated-scope or 5283 // dependent-scope friend declarations. 5284 5285 // TODO: we currently also suppress this check in dependent 5286 // contexts because (1) the parameter depth will be off when 5287 // matching friend templates and (2) we might actually be 5288 // selecting a friend based on a dependent factor. But there 5289 // are situations where these conditions don't apply and we 5290 // can actually do this check immediately. 5291 if (isFriend && 5292 (TemplateParamLists.size() || 5293 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5294 CurContext->isDependentContext())) { 5295 // ignore these 5296 } else { 5297 // The user tried to provide an out-of-line definition for a 5298 // function that is a member of a class or namespace, but there 5299 // was no such member function declared (C++ [class.mfct]p2, 5300 // C++ [namespace.memdef]p2). For example: 5301 // 5302 // class X { 5303 // void f() const; 5304 // }; 5305 // 5306 // void X::f() { } // ill-formed 5307 // 5308 // Complain about this problem, and attempt to suggest close 5309 // matches (e.g., those that differ only in cv-qualifiers and 5310 // whether the parameter types are references). 5311 5312 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5313 NewFD, 5314 ExtraArgs)) { 5315 AddToScope = ExtraArgs.AddToScope; 5316 return Result; 5317 } 5318 } 5319 5320 // Unqualified local friend declarations are required to resolve 5321 // to something. 5322 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5323 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5324 NewFD, 5325 ExtraArgs)) { 5326 AddToScope = ExtraArgs.AddToScope; 5327 return Result; 5328 } 5329 } 5330 5331 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5332 !isFriend && !isFunctionTemplateSpecialization && 5333 !isExplicitSpecialization) { 5334 // An out-of-line member function declaration must also be a 5335 // definition (C++ [dcl.meaning]p1). 5336 // Note that this is not the case for explicit specializations of 5337 // function templates or member functions of class templates, per 5338 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5339 // extension for compatibility with old SWIG code which likes to 5340 // generate them. 5341 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5342 << D.getCXXScopeSpec().getRange(); 5343 } 5344 } 5345 5346 5347 // Handle attributes. We need to have merged decls when handling attributes 5348 // (for example to check for conflicts, etc). 5349 // FIXME: This needs to happen before we merge declarations. Then, 5350 // let attribute merging cope with attribute conflicts. 5351 ProcessDeclAttributes(S, NewFD, D, 5352 /*NonInheritable=*/false, /*Inheritable=*/true); 5353 5354 // attributes declared post-definition are currently ignored 5355 // FIXME: This should happen during attribute merging 5356 if (D.isRedeclaration() && Previous.isSingleResult()) { 5357 const FunctionDecl *Def; 5358 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5359 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5360 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5361 Diag(Def->getLocation(), diag::note_previous_definition); 5362 } 5363 } 5364 5365 AddKnownFunctionAttributes(NewFD); 5366 5367 if (NewFD->hasAttr<OverloadableAttr>() && 5368 !NewFD->getType()->getAs<FunctionProtoType>()) { 5369 Diag(NewFD->getLocation(), 5370 diag::err_attribute_overloadable_no_prototype) 5371 << NewFD; 5372 5373 // Turn this into a variadic function with no parameters. 5374 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5375 FunctionProtoType::ExtProtoInfo EPI; 5376 EPI.Variadic = true; 5377 EPI.ExtInfo = FT->getExtInfo(); 5378 5379 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5380 NewFD->setType(R); 5381 } 5382 5383 // If there's a #pragma GCC visibility in scope, and this isn't a class 5384 // member, set the visibility of this function. 5385 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5386 AddPushedVisibilityAttribute(NewFD); 5387 5388 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5389 // marking the function. 5390 AddCFAuditedAttribute(NewFD); 5391 5392 // If this is a locally-scoped extern C function, update the 5393 // map of such names. 5394 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5395 && !NewFD->isInvalidDecl()) 5396 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5397 5398 // Set this FunctionDecl's range up to the right paren. 5399 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5400 5401 if (getLangOptions().CPlusPlus) { 5402 if (FunctionTemplate) { 5403 if (NewFD->isInvalidDecl()) 5404 FunctionTemplate->setInvalidDecl(); 5405 return FunctionTemplate; 5406 } 5407 } 5408 5409 MarkUnusedFileScopedDecl(NewFD); 5410 5411 if (getLangOptions().CUDA) 5412 if (IdentifierInfo *II = NewFD->getIdentifier()) 5413 if (!NewFD->isInvalidDecl() && 5414 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5415 if (II->isStr("cudaConfigureCall")) { 5416 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5417 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5418 5419 Context.setcudaConfigureCallDecl(NewFD); 5420 } 5421 } 5422 5423 // Here we have an function template explicit specialization at class scope. 5424 // The actually specialization will be postponed to template instatiation 5425 // time via the ClassScopeFunctionSpecializationDecl node. 5426 if (isDependentClassScopeExplicitSpecialization) { 5427 ClassScopeFunctionSpecializationDecl *NewSpec = 5428 ClassScopeFunctionSpecializationDecl::Create( 5429 Context, CurContext, SourceLocation(), 5430 cast<CXXMethodDecl>(NewFD)); 5431 CurContext->addDecl(NewSpec); 5432 AddToScope = false; 5433 } 5434 5435 return NewFD; 5436} 5437 5438/// \brief Perform semantic checking of a new function declaration. 5439/// 5440/// Performs semantic analysis of the new function declaration 5441/// NewFD. This routine performs all semantic checking that does not 5442/// require the actual declarator involved in the declaration, and is 5443/// used both for the declaration of functions as they are parsed 5444/// (called via ActOnDeclarator) and for the declaration of functions 5445/// that have been instantiated via C++ template instantiation (called 5446/// via InstantiateDecl). 5447/// 5448/// \param IsExplicitSpecialiation whether this new function declaration is 5449/// an explicit specialization of the previous declaration. 5450/// 5451/// This sets NewFD->isInvalidDecl() to true if there was an error. 5452/// 5453/// Returns true if the function declaration is a redeclaration. 5454bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5455 LookupResult &Previous, 5456 bool IsExplicitSpecialization) { 5457 assert(!NewFD->getResultType()->isVariablyModifiedType() 5458 && "Variably modified return types are not handled here"); 5459 5460 // Check for a previous declaration of this name. 5461 if (Previous.empty() && NewFD->isExternC()) { 5462 // Since we did not find anything by this name and we're declaring 5463 // an extern "C" function, look for a non-visible extern "C" 5464 // declaration with the same name. 5465 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5466 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5467 if (Pos != LocallyScopedExternalDecls.end()) 5468 Previous.addDecl(Pos->second); 5469 } 5470 5471 bool Redeclaration = false; 5472 5473 // Merge or overload the declaration with an existing declaration of 5474 // the same name, if appropriate. 5475 if (!Previous.empty()) { 5476 // Determine whether NewFD is an overload of PrevDecl or 5477 // a declaration that requires merging. If it's an overload, 5478 // there's no more work to do here; we'll just add the new 5479 // function to the scope. 5480 5481 NamedDecl *OldDecl = 0; 5482 if (!AllowOverloadingOfFunction(Previous, Context)) { 5483 Redeclaration = true; 5484 OldDecl = Previous.getFoundDecl(); 5485 } else { 5486 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5487 /*NewIsUsingDecl*/ false)) { 5488 case Ovl_Match: 5489 Redeclaration = true; 5490 break; 5491 5492 case Ovl_NonFunction: 5493 Redeclaration = true; 5494 break; 5495 5496 case Ovl_Overload: 5497 Redeclaration = false; 5498 break; 5499 } 5500 5501 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5502 // If a function name is overloadable in C, then every function 5503 // with that name must be marked "overloadable". 5504 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5505 << Redeclaration << NewFD; 5506 NamedDecl *OverloadedDecl = 0; 5507 if (Redeclaration) 5508 OverloadedDecl = OldDecl; 5509 else if (!Previous.empty()) 5510 OverloadedDecl = Previous.getRepresentativeDecl(); 5511 if (OverloadedDecl) 5512 Diag(OverloadedDecl->getLocation(), 5513 diag::note_attribute_overloadable_prev_overload); 5514 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5515 Context)); 5516 } 5517 } 5518 5519 if (Redeclaration) { 5520 // NewFD and OldDecl represent declarations that need to be 5521 // merged. 5522 if (MergeFunctionDecl(NewFD, OldDecl)) { 5523 NewFD->setInvalidDecl(); 5524 return Redeclaration; 5525 } 5526 5527 Previous.clear(); 5528 Previous.addDecl(OldDecl); 5529 5530 if (FunctionTemplateDecl *OldTemplateDecl 5531 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5532 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5533 FunctionTemplateDecl *NewTemplateDecl 5534 = NewFD->getDescribedFunctionTemplate(); 5535 assert(NewTemplateDecl && "Template/non-template mismatch"); 5536 if (CXXMethodDecl *Method 5537 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5538 Method->setAccess(OldTemplateDecl->getAccess()); 5539 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5540 } 5541 5542 // If this is an explicit specialization of a member that is a function 5543 // template, mark it as a member specialization. 5544 if (IsExplicitSpecialization && 5545 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5546 NewTemplateDecl->setMemberSpecialization(); 5547 assert(OldTemplateDecl->isMemberSpecialization()); 5548 } 5549 5550 if (OldTemplateDecl->isModulePrivate()) 5551 NewTemplateDecl->setModulePrivate(); 5552 5553 } else { 5554 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5555 NewFD->setAccess(OldDecl->getAccess()); 5556 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5557 } 5558 } 5559 } 5560 5561 // Semantic checking for this function declaration (in isolation). 5562 if (getLangOptions().CPlusPlus) { 5563 // C++-specific checks. 5564 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5565 CheckConstructor(Constructor); 5566 } else if (CXXDestructorDecl *Destructor = 5567 dyn_cast<CXXDestructorDecl>(NewFD)) { 5568 CXXRecordDecl *Record = Destructor->getParent(); 5569 QualType ClassType = Context.getTypeDeclType(Record); 5570 5571 // FIXME: Shouldn't we be able to perform this check even when the class 5572 // type is dependent? Both gcc and edg can handle that. 5573 if (!ClassType->isDependentType()) { 5574 DeclarationName Name 5575 = Context.DeclarationNames.getCXXDestructorName( 5576 Context.getCanonicalType(ClassType)); 5577 if (NewFD->getDeclName() != Name) { 5578 Diag(NewFD->getLocation(), diag::err_destructor_name); 5579 NewFD->setInvalidDecl(); 5580 return Redeclaration; 5581 } 5582 } 5583 } else if (CXXConversionDecl *Conversion 5584 = dyn_cast<CXXConversionDecl>(NewFD)) { 5585 ActOnConversionDeclarator(Conversion); 5586 } 5587 5588 // Find any virtual functions that this function overrides. 5589 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5590 if (!Method->isFunctionTemplateSpecialization() && 5591 !Method->getDescribedFunctionTemplate()) { 5592 if (AddOverriddenMethods(Method->getParent(), Method)) { 5593 // If the function was marked as "static", we have a problem. 5594 if (NewFD->getStorageClass() == SC_Static) { 5595 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5596 << NewFD->getDeclName(); 5597 for (CXXMethodDecl::method_iterator 5598 Overridden = Method->begin_overridden_methods(), 5599 OverriddenEnd = Method->end_overridden_methods(); 5600 Overridden != OverriddenEnd; 5601 ++Overridden) { 5602 Diag((*Overridden)->getLocation(), 5603 diag::note_overridden_virtual_function); 5604 } 5605 } 5606 } 5607 } 5608 } 5609 5610 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5611 if (NewFD->isOverloadedOperator() && 5612 CheckOverloadedOperatorDeclaration(NewFD)) { 5613 NewFD->setInvalidDecl(); 5614 return Redeclaration; 5615 } 5616 5617 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5618 if (NewFD->getLiteralIdentifier() && 5619 CheckLiteralOperatorDeclaration(NewFD)) { 5620 NewFD->setInvalidDecl(); 5621 return Redeclaration; 5622 } 5623 5624 // In C++, check default arguments now that we have merged decls. Unless 5625 // the lexical context is the class, because in this case this is done 5626 // during delayed parsing anyway. 5627 if (!CurContext->isRecord()) 5628 CheckCXXDefaultArguments(NewFD); 5629 5630 // If this function declares a builtin function, check the type of this 5631 // declaration against the expected type for the builtin. 5632 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5633 ASTContext::GetBuiltinTypeError Error; 5634 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5635 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5636 // The type of this function differs from the type of the builtin, 5637 // so forget about the builtin entirely. 5638 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5639 } 5640 } 5641 } 5642 return Redeclaration; 5643} 5644 5645void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5646 // C++ [basic.start.main]p3: A program that declares main to be inline 5647 // or static is ill-formed. 5648 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5649 // shall not appear in a declaration of main. 5650 // static main is not an error under C99, but we should warn about it. 5651 if (FD->getStorageClass() == SC_Static) 5652 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5653 ? diag::err_static_main : diag::warn_static_main) 5654 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5655 if (FD->isInlineSpecified()) 5656 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5657 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5658 5659 QualType T = FD->getType(); 5660 assert(T->isFunctionType() && "function decl is not of function type"); 5661 const FunctionType* FT = T->getAs<FunctionType>(); 5662 5663 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5664 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5665 FD->setInvalidDecl(true); 5666 } 5667 5668 // Treat protoless main() as nullary. 5669 if (isa<FunctionNoProtoType>(FT)) return; 5670 5671 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5672 unsigned nparams = FTP->getNumArgs(); 5673 assert(FD->getNumParams() == nparams); 5674 5675 bool HasExtraParameters = (nparams > 3); 5676 5677 // Darwin passes an undocumented fourth argument of type char**. If 5678 // other platforms start sprouting these, the logic below will start 5679 // getting shifty. 5680 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5681 HasExtraParameters = false; 5682 5683 if (HasExtraParameters) { 5684 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5685 FD->setInvalidDecl(true); 5686 nparams = 3; 5687 } 5688 5689 // FIXME: a lot of the following diagnostics would be improved 5690 // if we had some location information about types. 5691 5692 QualType CharPP = 5693 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5694 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5695 5696 for (unsigned i = 0; i < nparams; ++i) { 5697 QualType AT = FTP->getArgType(i); 5698 5699 bool mismatch = true; 5700 5701 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5702 mismatch = false; 5703 else if (Expected[i] == CharPP) { 5704 // As an extension, the following forms are okay: 5705 // char const ** 5706 // char const * const * 5707 // char * const * 5708 5709 QualifierCollector qs; 5710 const PointerType* PT; 5711 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5712 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5713 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5714 qs.removeConst(); 5715 mismatch = !qs.empty(); 5716 } 5717 } 5718 5719 if (mismatch) { 5720 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5721 // TODO: suggest replacing given type with expected type 5722 FD->setInvalidDecl(true); 5723 } 5724 } 5725 5726 if (nparams == 1 && !FD->isInvalidDecl()) { 5727 Diag(FD->getLocation(), diag::warn_main_one_arg); 5728 } 5729 5730 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5731 Diag(FD->getLocation(), diag::err_main_template_decl); 5732 FD->setInvalidDecl(); 5733 } 5734} 5735 5736bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5737 // FIXME: Need strict checking. In C89, we need to check for 5738 // any assignment, increment, decrement, function-calls, or 5739 // commas outside of a sizeof. In C99, it's the same list, 5740 // except that the aforementioned are allowed in unevaluated 5741 // expressions. Everything else falls under the 5742 // "may accept other forms of constant expressions" exception. 5743 // (We never end up here for C++, so the constant expression 5744 // rules there don't matter.) 5745 if (Init->isConstantInitializer(Context, false)) 5746 return false; 5747 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5748 << Init->getSourceRange(); 5749 return true; 5750} 5751 5752namespace { 5753 // Visits an initialization expression to see if OrigDecl is evaluated in 5754 // its own initialization and throws a warning if it does. 5755 class SelfReferenceChecker 5756 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5757 Sema &S; 5758 Decl *OrigDecl; 5759 bool isRecordType; 5760 bool isPODType; 5761 5762 public: 5763 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5764 5765 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5766 S(S), OrigDecl(OrigDecl) { 5767 isPODType = false; 5768 isRecordType = false; 5769 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5770 isPODType = VD->getType().isPODType(S.Context); 5771 isRecordType = VD->getType()->isRecordType(); 5772 } 5773 } 5774 5775 void VisitExpr(Expr *E) { 5776 if (isa<ObjCMessageExpr>(*E)) return; 5777 if (isRecordType) { 5778 Expr *expr = E; 5779 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5780 ValueDecl *VD = ME->getMemberDecl(); 5781 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5782 expr = ME->getBase(); 5783 } 5784 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5785 HandleDeclRefExpr(DRE); 5786 return; 5787 } 5788 } 5789 Inherited::VisitExpr(E); 5790 } 5791 5792 void VisitMemberExpr(MemberExpr *E) { 5793 if (E->getType()->canDecayToPointerType()) return; 5794 if (isa<FieldDecl>(E->getMemberDecl())) 5795 if (DeclRefExpr *DRE 5796 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5797 HandleDeclRefExpr(DRE); 5798 return; 5799 } 5800 Inherited::VisitMemberExpr(E); 5801 } 5802 5803 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5804 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5805 (isRecordType && E->getCastKind() == CK_NoOp)) { 5806 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5807 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5808 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5809 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5810 HandleDeclRefExpr(DRE); 5811 return; 5812 } 5813 } 5814 Inherited::VisitImplicitCastExpr(E); 5815 } 5816 5817 void VisitUnaryOperator(UnaryOperator *E) { 5818 // For POD record types, addresses of its own members are well-defined. 5819 if (isRecordType && isPODType) return; 5820 Inherited::VisitUnaryOperator(E); 5821 } 5822 5823 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5824 Decl* ReferenceDecl = DRE->getDecl(); 5825 if (OrigDecl != ReferenceDecl) return; 5826 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5827 Sema::NotForRedeclaration); 5828 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5829 S.PDiag(diag::warn_uninit_self_reference_in_init) 5830 << Result.getLookupName() 5831 << OrigDecl->getLocation() 5832 << DRE->getSourceRange()); 5833 } 5834 }; 5835} 5836 5837/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5838void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5839 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5840} 5841 5842/// AddInitializerToDecl - Adds the initializer Init to the 5843/// declaration dcl. If DirectInit is true, this is C++ direct 5844/// initialization rather than copy initialization. 5845void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5846 bool DirectInit, bool TypeMayContainAuto) { 5847 // If there is no declaration, there was an error parsing it. Just ignore 5848 // the initializer. 5849 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5850 return; 5851 5852 // Check for self-references within variable initializers. 5853 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5854 // Variables declared within a function/method body are handled 5855 // by a dataflow analysis. 5856 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5857 CheckSelfReference(RealDecl, Init); 5858 } 5859 else { 5860 CheckSelfReference(RealDecl, Init); 5861 } 5862 5863 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5864 // With declarators parsed the way they are, the parser cannot 5865 // distinguish between a normal initializer and a pure-specifier. 5866 // Thus this grotesque test. 5867 IntegerLiteral *IL; 5868 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5869 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5870 CheckPureMethod(Method, Init->getSourceRange()); 5871 else { 5872 Diag(Method->getLocation(), diag::err_member_function_initialization) 5873 << Method->getDeclName() << Init->getSourceRange(); 5874 Method->setInvalidDecl(); 5875 } 5876 return; 5877 } 5878 5879 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5880 if (!VDecl) { 5881 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5882 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5883 RealDecl->setInvalidDecl(); 5884 return; 5885 } 5886 5887 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5888 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5889 TypeSourceInfo *DeducedType = 0; 5890 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5891 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5892 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5893 << Init->getSourceRange(); 5894 if (!DeducedType) { 5895 RealDecl->setInvalidDecl(); 5896 return; 5897 } 5898 VDecl->setTypeSourceInfo(DeducedType); 5899 VDecl->setType(DeducedType->getType()); 5900 5901 // In ARC, infer lifetime. 5902 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5903 VDecl->setInvalidDecl(); 5904 5905 // If this is a redeclaration, check that the type we just deduced matches 5906 // the previously declared type. 5907 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5908 MergeVarDeclTypes(VDecl, Old); 5909 } 5910 5911 5912 // A definition must end up with a complete type, which means it must be 5913 // complete with the restriction that an array type might be completed by the 5914 // initializer; note that later code assumes this restriction. 5915 QualType BaseDeclType = VDecl->getType(); 5916 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5917 BaseDeclType = Array->getElementType(); 5918 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5919 diag::err_typecheck_decl_incomplete_type)) { 5920 RealDecl->setInvalidDecl(); 5921 return; 5922 } 5923 5924 // The variable can not have an abstract class type. 5925 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5926 diag::err_abstract_type_in_decl, 5927 AbstractVariableType)) 5928 VDecl->setInvalidDecl(); 5929 5930 const VarDecl *Def; 5931 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5932 Diag(VDecl->getLocation(), diag::err_redefinition) 5933 << VDecl->getDeclName(); 5934 Diag(Def->getLocation(), diag::note_previous_definition); 5935 VDecl->setInvalidDecl(); 5936 return; 5937 } 5938 5939 const VarDecl* PrevInit = 0; 5940 if (getLangOptions().CPlusPlus) { 5941 // C++ [class.static.data]p4 5942 // If a static data member is of const integral or const 5943 // enumeration type, its declaration in the class definition can 5944 // specify a constant-initializer which shall be an integral 5945 // constant expression (5.19). In that case, the member can appear 5946 // in integral constant expressions. The member shall still be 5947 // defined in a namespace scope if it is used in the program and the 5948 // namespace scope definition shall not contain an initializer. 5949 // 5950 // We already performed a redefinition check above, but for static 5951 // data members we also need to check whether there was an in-class 5952 // declaration with an initializer. 5953 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5954 Diag(VDecl->getLocation(), diag::err_redefinition) 5955 << VDecl->getDeclName(); 5956 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5957 return; 5958 } 5959 5960 if (VDecl->hasLocalStorage()) 5961 getCurFunction()->setHasBranchProtectedScope(); 5962 5963 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5964 VDecl->setInvalidDecl(); 5965 return; 5966 } 5967 } 5968 5969 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5970 // a kernel function cannot be initialized." 5971 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5972 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5973 VDecl->setInvalidDecl(); 5974 return; 5975 } 5976 5977 // Capture the variable that is being initialized and the style of 5978 // initialization. 5979 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5980 5981 // FIXME: Poor source location information. 5982 InitializationKind Kind 5983 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5984 Init->getLocStart(), 5985 Init->getLocEnd()) 5986 : InitializationKind::CreateCopy(VDecl->getLocation(), 5987 Init->getLocStart()); 5988 5989 // Get the decls type and save a reference for later, since 5990 // CheckInitializerTypes may change it. 5991 QualType DclT = VDecl->getType(), SavT = DclT; 5992 if (VDecl->isLocalVarDecl()) { 5993 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5994 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5995 VDecl->setInvalidDecl(); 5996 } else if (!VDecl->isInvalidDecl()) { 5997 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5998 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5999 MultiExprArg(*this, &Init, 1), 6000 &DclT); 6001 if (Result.isInvalid()) { 6002 VDecl->setInvalidDecl(); 6003 return; 6004 } 6005 6006 Init = Result.takeAs<Expr>(); 6007 6008 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6009 // Don't check invalid declarations to avoid emitting useless diagnostics. 6010 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6011 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 6012 CheckForConstantInitializer(Init, DclT); 6013 } 6014 } 6015 } else if (VDecl->isStaticDataMember() && 6016 VDecl->getLexicalDeclContext()->isRecord()) { 6017 // This is an in-class initialization for a static data member, e.g., 6018 // 6019 // struct S { 6020 // static const int value = 17; 6021 // }; 6022 6023 // Try to perform the initialization regardless. 6024 if (!VDecl->isInvalidDecl()) { 6025 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6026 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6027 MultiExprArg(*this, &Init, 1), 6028 &DclT); 6029 if (Result.isInvalid()) { 6030 VDecl->setInvalidDecl(); 6031 return; 6032 } 6033 6034 Init = Result.takeAs<Expr>(); 6035 } 6036 6037 // C++ [class.mem]p4: 6038 // A member-declarator can contain a constant-initializer only 6039 // if it declares a static member (9.4) of const integral or 6040 // const enumeration type, see 9.4.2. 6041 // 6042 // C++0x [class.static.data]p3: 6043 // If a non-volatile const static data member is of integral or 6044 // enumeration type, its declaration in the class definition can 6045 // specify a brace-or-equal-initializer in which every initalizer-clause 6046 // that is an assignment-expression is a constant expression. A static 6047 // data member of literal type can be declared in the class definition 6048 // with the constexpr specifier; if so, its declaration shall specify a 6049 // brace-or-equal-initializer in which every initializer-clause that is 6050 // an assignment-expression is a constant expression. 6051 QualType T = VDecl->getType(); 6052 6053 // Do nothing on dependent types. 6054 if (T->isDependentType()) { 6055 6056 // Allow any 'static constexpr' members, whether or not they are of literal 6057 // type. We separately check that the initializer is a constant expression, 6058 // which implicitly requires the member to be of literal type. 6059 } else if (VDecl->isConstexpr()) { 6060 6061 // Require constness. 6062 } else if (!T.isConstQualified()) { 6063 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6064 << Init->getSourceRange(); 6065 VDecl->setInvalidDecl(); 6066 6067 // We allow integer constant expressions in all cases. 6068 } else if (T->isIntegralOrEnumerationType()) { 6069 // Check whether the expression is a constant expression. 6070 SourceLocation Loc; 6071 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 6072 // In C++0x, a non-constexpr const static data member with an 6073 // in-class initializer cannot be volatile. 6074 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6075 else if (Init->isValueDependent()) 6076 ; // Nothing to check. 6077 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6078 ; // Ok, it's an ICE! 6079 else if (Init->isEvaluatable(Context)) { 6080 // If we can constant fold the initializer through heroics, accept it, 6081 // but report this as a use of an extension for -pedantic. 6082 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6083 << Init->getSourceRange(); 6084 } else { 6085 // Otherwise, this is some crazy unknown case. Report the issue at the 6086 // location provided by the isIntegerConstantExpr failed check. 6087 Diag(Loc, diag::err_in_class_initializer_non_constant) 6088 << Init->getSourceRange(); 6089 VDecl->setInvalidDecl(); 6090 } 6091 6092 // We allow floating-point constants as an extension. 6093 } else if (T->isFloatingType()) { // also permits complex, which is ok 6094 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6095 << T << Init->getSourceRange(); 6096 if (getLangOptions().CPlusPlus0x) 6097 Diag(VDecl->getLocation(), 6098 diag::note_in_class_initializer_float_type_constexpr) 6099 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6100 6101 if (!Init->isValueDependent() && 6102 !Init->isConstantInitializer(Context, false)) { 6103 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6104 << Init->getSourceRange(); 6105 VDecl->setInvalidDecl(); 6106 } 6107 6108 // Suggest adding 'constexpr' in C++0x for literal types. 6109 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 6110 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6111 << T << Init->getSourceRange() 6112 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6113 VDecl->setConstexpr(true); 6114 6115 } else { 6116 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6117 << T << Init->getSourceRange(); 6118 VDecl->setInvalidDecl(); 6119 } 6120 } else if (VDecl->isFileVarDecl()) { 6121 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6122 (!getLangOptions().CPlusPlus || 6123 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6124 Diag(VDecl->getLocation(), diag::warn_extern_init); 6125 if (!VDecl->isInvalidDecl()) { 6126 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6127 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6128 MultiExprArg(*this, &Init, 1), 6129 &DclT); 6130 if (Result.isInvalid()) { 6131 VDecl->setInvalidDecl(); 6132 return; 6133 } 6134 6135 Init = Result.takeAs<Expr>(); 6136 } 6137 6138 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 6139 // Don't check invalid declarations to avoid emitting useless diagnostics. 6140 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 6141 // C99 6.7.8p4. All file scoped initializers need to be constant. 6142 CheckForConstantInitializer(Init, DclT); 6143 } 6144 } 6145 // If the type changed, it means we had an incomplete type that was 6146 // completed by the initializer. For example: 6147 // int ary[] = { 1, 3, 5 }; 6148 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 6149 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6150 VDecl->setType(DclT); 6151 Init->setType(DclT); 6152 } 6153 6154 // Check any implicit conversions within the expression. 6155 CheckImplicitConversions(Init, VDecl->getLocation()); 6156 6157 if (!VDecl->isInvalidDecl()) 6158 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6159 6160 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 6161 !VDecl->getType()->isDependentType() && 6162 !Init->isTypeDependent() && !Init->isValueDependent() && 6163 !Init->isConstantInitializer(Context, 6164 VDecl->getType()->isReferenceType())) { 6165 // FIXME: Improve this diagnostic to explain why the initializer is not 6166 // a constant expression. 6167 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 6168 << VDecl << Init->getSourceRange(); 6169 } 6170 6171 Init = MaybeCreateExprWithCleanups(Init); 6172 // Attach the initializer to the decl. 6173 VDecl->setInit(Init); 6174 6175 CheckCompleteVariableDeclaration(VDecl); 6176} 6177 6178/// ActOnInitializerError - Given that there was an error parsing an 6179/// initializer for the given declaration, try to return to some form 6180/// of sanity. 6181void Sema::ActOnInitializerError(Decl *D) { 6182 // Our main concern here is re-establishing invariants like "a 6183 // variable's type is either dependent or complete". 6184 if (!D || D->isInvalidDecl()) return; 6185 6186 VarDecl *VD = dyn_cast<VarDecl>(D); 6187 if (!VD) return; 6188 6189 // Auto types are meaningless if we can't make sense of the initializer. 6190 if (ParsingInitForAutoVars.count(D)) { 6191 D->setInvalidDecl(); 6192 return; 6193 } 6194 6195 QualType Ty = VD->getType(); 6196 if (Ty->isDependentType()) return; 6197 6198 // Require a complete type. 6199 if (RequireCompleteType(VD->getLocation(), 6200 Context.getBaseElementType(Ty), 6201 diag::err_typecheck_decl_incomplete_type)) { 6202 VD->setInvalidDecl(); 6203 return; 6204 } 6205 6206 // Require an abstract type. 6207 if (RequireNonAbstractType(VD->getLocation(), Ty, 6208 diag::err_abstract_type_in_decl, 6209 AbstractVariableType)) { 6210 VD->setInvalidDecl(); 6211 return; 6212 } 6213 6214 // Don't bother complaining about constructors or destructors, 6215 // though. 6216} 6217 6218void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6219 bool TypeMayContainAuto) { 6220 // If there is no declaration, there was an error parsing it. Just ignore it. 6221 if (RealDecl == 0) 6222 return; 6223 6224 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6225 QualType Type = Var->getType(); 6226 6227 // C++0x [dcl.spec.auto]p3 6228 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6229 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6230 << Var->getDeclName() << Type; 6231 Var->setInvalidDecl(); 6232 return; 6233 } 6234 6235 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6236 // have an initializer. 6237 // C++0x [class.static.data]p3: A static data member can be declared with 6238 // the constexpr specifier; if so, its declaration shall specify 6239 // a brace-or-equal-initializer. 6240 // 6241 // A static data member's definition may inherit an initializer from an 6242 // in-class declaration. 6243 if (Var->isConstexpr() && !Var->getAnyInitializer()) { 6244 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6245 << Var->getDeclName(); 6246 Var->setInvalidDecl(); 6247 return; 6248 } 6249 6250 switch (Var->isThisDeclarationADefinition()) { 6251 case VarDecl::Definition: 6252 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6253 break; 6254 6255 // We have an out-of-line definition of a static data member 6256 // that has an in-class initializer, so we type-check this like 6257 // a declaration. 6258 // 6259 // Fall through 6260 6261 case VarDecl::DeclarationOnly: 6262 // It's only a declaration. 6263 6264 // Block scope. C99 6.7p7: If an identifier for an object is 6265 // declared with no linkage (C99 6.2.2p6), the type for the 6266 // object shall be complete. 6267 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6268 !Var->getLinkage() && !Var->isInvalidDecl() && 6269 RequireCompleteType(Var->getLocation(), Type, 6270 diag::err_typecheck_decl_incomplete_type)) 6271 Var->setInvalidDecl(); 6272 6273 // Make sure that the type is not abstract. 6274 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6275 RequireNonAbstractType(Var->getLocation(), Type, 6276 diag::err_abstract_type_in_decl, 6277 AbstractVariableType)) 6278 Var->setInvalidDecl(); 6279 return; 6280 6281 case VarDecl::TentativeDefinition: 6282 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6283 // object that has file scope without an initializer, and without a 6284 // storage-class specifier or with the storage-class specifier "static", 6285 // constitutes a tentative definition. Note: A tentative definition with 6286 // external linkage is valid (C99 6.2.2p5). 6287 if (!Var->isInvalidDecl()) { 6288 if (const IncompleteArrayType *ArrayT 6289 = Context.getAsIncompleteArrayType(Type)) { 6290 if (RequireCompleteType(Var->getLocation(), 6291 ArrayT->getElementType(), 6292 diag::err_illegal_decl_array_incomplete_type)) 6293 Var->setInvalidDecl(); 6294 } else if (Var->getStorageClass() == SC_Static) { 6295 // C99 6.9.2p3: If the declaration of an identifier for an object is 6296 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6297 // declared type shall not be an incomplete type. 6298 // NOTE: code such as the following 6299 // static struct s; 6300 // struct s { int a; }; 6301 // is accepted by gcc. Hence here we issue a warning instead of 6302 // an error and we do not invalidate the static declaration. 6303 // NOTE: to avoid multiple warnings, only check the first declaration. 6304 if (Var->getPreviousDeclaration() == 0) 6305 RequireCompleteType(Var->getLocation(), Type, 6306 diag::ext_typecheck_decl_incomplete_type); 6307 } 6308 } 6309 6310 // Record the tentative definition; we're done. 6311 if (!Var->isInvalidDecl()) 6312 TentativeDefinitions.push_back(Var); 6313 return; 6314 } 6315 6316 // Provide a specific diagnostic for uninitialized variable 6317 // definitions with incomplete array type. 6318 if (Type->isIncompleteArrayType()) { 6319 Diag(Var->getLocation(), 6320 diag::err_typecheck_incomplete_array_needs_initializer); 6321 Var->setInvalidDecl(); 6322 return; 6323 } 6324 6325 // Provide a specific diagnostic for uninitialized variable 6326 // definitions with reference type. 6327 if (Type->isReferenceType()) { 6328 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6329 << Var->getDeclName() 6330 << SourceRange(Var->getLocation(), Var->getLocation()); 6331 Var->setInvalidDecl(); 6332 return; 6333 } 6334 6335 // Do not attempt to type-check the default initializer for a 6336 // variable with dependent type. 6337 if (Type->isDependentType()) 6338 return; 6339 6340 if (Var->isInvalidDecl()) 6341 return; 6342 6343 if (RequireCompleteType(Var->getLocation(), 6344 Context.getBaseElementType(Type), 6345 diag::err_typecheck_decl_incomplete_type)) { 6346 Var->setInvalidDecl(); 6347 return; 6348 } 6349 6350 // The variable can not have an abstract class type. 6351 if (RequireNonAbstractType(Var->getLocation(), Type, 6352 diag::err_abstract_type_in_decl, 6353 AbstractVariableType)) { 6354 Var->setInvalidDecl(); 6355 return; 6356 } 6357 6358 // Check for jumps past the implicit initializer. C++0x 6359 // clarifies that this applies to a "variable with automatic 6360 // storage duration", not a "local variable". 6361 // C++11 [stmt.dcl]p3 6362 // A program that jumps from a point where a variable with automatic 6363 // storage duration is not in scope to a point where it is in scope is 6364 // ill-formed unless the variable has scalar type, class type with a 6365 // trivial default constructor and a trivial destructor, a cv-qualified 6366 // version of one of these types, or an array of one of the preceding 6367 // types and is declared without an initializer. 6368 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6369 if (const RecordType *Record 6370 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6371 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6372 // Mark the function for further checking even if the looser rules of 6373 // C++11 do not require such checks, so that we can diagnose 6374 // incompatibilities with C++98. 6375 if (!CXXRecord->isPOD()) 6376 getCurFunction()->setHasBranchProtectedScope(); 6377 } 6378 } 6379 6380 // C++03 [dcl.init]p9: 6381 // If no initializer is specified for an object, and the 6382 // object is of (possibly cv-qualified) non-POD class type (or 6383 // array thereof), the object shall be default-initialized; if 6384 // the object is of const-qualified type, the underlying class 6385 // type shall have a user-declared default 6386 // constructor. Otherwise, if no initializer is specified for 6387 // a non- static object, the object and its subobjects, if 6388 // any, have an indeterminate initial value); if the object 6389 // or any of its subobjects are of const-qualified type, the 6390 // program is ill-formed. 6391 // C++0x [dcl.init]p11: 6392 // If no initializer is specified for an object, the object is 6393 // default-initialized; [...]. 6394 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6395 InitializationKind Kind 6396 = InitializationKind::CreateDefault(Var->getLocation()); 6397 6398 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6399 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6400 MultiExprArg(*this, 0, 0)); 6401 if (Init.isInvalid()) 6402 Var->setInvalidDecl(); 6403 else if (Init.get()) 6404 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6405 6406 CheckCompleteVariableDeclaration(Var); 6407 } 6408} 6409 6410void Sema::ActOnCXXForRangeDecl(Decl *D) { 6411 VarDecl *VD = dyn_cast<VarDecl>(D); 6412 if (!VD) { 6413 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6414 D->setInvalidDecl(); 6415 return; 6416 } 6417 6418 VD->setCXXForRangeDecl(true); 6419 6420 // for-range-declaration cannot be given a storage class specifier. 6421 int Error = -1; 6422 switch (VD->getStorageClassAsWritten()) { 6423 case SC_None: 6424 break; 6425 case SC_Extern: 6426 Error = 0; 6427 break; 6428 case SC_Static: 6429 Error = 1; 6430 break; 6431 case SC_PrivateExtern: 6432 Error = 2; 6433 break; 6434 case SC_Auto: 6435 Error = 3; 6436 break; 6437 case SC_Register: 6438 Error = 4; 6439 break; 6440 case SC_OpenCLWorkGroupLocal: 6441 llvm_unreachable("Unexpected storage class"); 6442 } 6443 if (VD->isConstexpr()) 6444 Error = 5; 6445 if (Error != -1) { 6446 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6447 << VD->getDeclName() << Error; 6448 D->setInvalidDecl(); 6449 } 6450} 6451 6452void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6453 if (var->isInvalidDecl()) return; 6454 6455 // In ARC, don't allow jumps past the implicit initialization of a 6456 // local retaining variable. 6457 if (getLangOptions().ObjCAutoRefCount && 6458 var->hasLocalStorage()) { 6459 switch (var->getType().getObjCLifetime()) { 6460 case Qualifiers::OCL_None: 6461 case Qualifiers::OCL_ExplicitNone: 6462 case Qualifiers::OCL_Autoreleasing: 6463 break; 6464 6465 case Qualifiers::OCL_Weak: 6466 case Qualifiers::OCL_Strong: 6467 getCurFunction()->setHasBranchProtectedScope(); 6468 break; 6469 } 6470 } 6471 6472 // All the following checks are C++ only. 6473 if (!getLangOptions().CPlusPlus) return; 6474 6475 QualType baseType = Context.getBaseElementType(var->getType()); 6476 if (baseType->isDependentType()) return; 6477 6478 // __block variables might require us to capture a copy-initializer. 6479 if (var->hasAttr<BlocksAttr>()) { 6480 // It's currently invalid to ever have a __block variable with an 6481 // array type; should we diagnose that here? 6482 6483 // Regardless, we don't want to ignore array nesting when 6484 // constructing this copy. 6485 QualType type = var->getType(); 6486 6487 if (type->isStructureOrClassType()) { 6488 SourceLocation poi = var->getLocation(); 6489 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6490 ExprResult result = 6491 PerformCopyInitialization( 6492 InitializedEntity::InitializeBlock(poi, type, false), 6493 poi, Owned(varRef)); 6494 if (!result.isInvalid()) { 6495 result = MaybeCreateExprWithCleanups(result); 6496 Expr *init = result.takeAs<Expr>(); 6497 Context.setBlockVarCopyInits(var, init); 6498 } 6499 } 6500 } 6501 6502 // Check for global constructors. 6503 if (!var->getDeclContext()->isDependentContext() && 6504 var->hasGlobalStorage() && 6505 !var->isStaticLocal() && 6506 var->getInit() && 6507 !var->getInit()->isConstantInitializer(Context, 6508 baseType->isReferenceType())) 6509 Diag(var->getLocation(), diag::warn_global_constructor) 6510 << var->getInit()->getSourceRange(); 6511 6512 // Require the destructor. 6513 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6514 FinalizeVarWithDestructor(var, recordType); 6515} 6516 6517/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6518/// any semantic actions necessary after any initializer has been attached. 6519void 6520Sema::FinalizeDeclaration(Decl *ThisDecl) { 6521 // Note that we are no longer parsing the initializer for this declaration. 6522 ParsingInitForAutoVars.erase(ThisDecl); 6523} 6524 6525Sema::DeclGroupPtrTy 6526Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6527 Decl **Group, unsigned NumDecls) { 6528 SmallVector<Decl*, 8> Decls; 6529 6530 if (DS.isTypeSpecOwned()) 6531 Decls.push_back(DS.getRepAsDecl()); 6532 6533 for (unsigned i = 0; i != NumDecls; ++i) 6534 if (Decl *D = Group[i]) 6535 Decls.push_back(D); 6536 6537 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6538 DS.getTypeSpecType() == DeclSpec::TST_auto); 6539} 6540 6541/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6542/// group, performing any necessary semantic checking. 6543Sema::DeclGroupPtrTy 6544Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6545 bool TypeMayContainAuto) { 6546 // C++0x [dcl.spec.auto]p7: 6547 // If the type deduced for the template parameter U is not the same in each 6548 // deduction, the program is ill-formed. 6549 // FIXME: When initializer-list support is added, a distinction is needed 6550 // between the deduced type U and the deduced type which 'auto' stands for. 6551 // auto a = 0, b = { 1, 2, 3 }; 6552 // is legal because the deduced type U is 'int' in both cases. 6553 if (TypeMayContainAuto && NumDecls > 1) { 6554 QualType Deduced; 6555 CanQualType DeducedCanon; 6556 VarDecl *DeducedDecl = 0; 6557 for (unsigned i = 0; i != NumDecls; ++i) { 6558 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6559 AutoType *AT = D->getType()->getContainedAutoType(); 6560 // Don't reissue diagnostics when instantiating a template. 6561 if (AT && D->isInvalidDecl()) 6562 break; 6563 if (AT && AT->isDeduced()) { 6564 QualType U = AT->getDeducedType(); 6565 CanQualType UCanon = Context.getCanonicalType(U); 6566 if (Deduced.isNull()) { 6567 Deduced = U; 6568 DeducedCanon = UCanon; 6569 DeducedDecl = D; 6570 } else if (DeducedCanon != UCanon) { 6571 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6572 diag::err_auto_different_deductions) 6573 << Deduced << DeducedDecl->getDeclName() 6574 << U << D->getDeclName() 6575 << DeducedDecl->getInit()->getSourceRange() 6576 << D->getInit()->getSourceRange(); 6577 D->setInvalidDecl(); 6578 break; 6579 } 6580 } 6581 } 6582 } 6583 } 6584 6585 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6586} 6587 6588 6589/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6590/// to introduce parameters into function prototype scope. 6591Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6592 const DeclSpec &DS = D.getDeclSpec(); 6593 6594 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6595 // C++03 [dcl.stc]p2 also permits 'auto'. 6596 VarDecl::StorageClass StorageClass = SC_None; 6597 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6598 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6599 StorageClass = SC_Register; 6600 StorageClassAsWritten = SC_Register; 6601 } else if (getLangOptions().CPlusPlus && 6602 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6603 StorageClass = SC_Auto; 6604 StorageClassAsWritten = SC_Auto; 6605 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6606 Diag(DS.getStorageClassSpecLoc(), 6607 diag::err_invalid_storage_class_in_func_decl); 6608 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6609 } 6610 6611 if (D.getDeclSpec().isThreadSpecified()) 6612 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6613 if (D.getDeclSpec().isConstexprSpecified()) 6614 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6615 << 0; 6616 6617 DiagnoseFunctionSpecifiers(D); 6618 6619 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6620 QualType parmDeclType = TInfo->getType(); 6621 6622 if (getLangOptions().CPlusPlus) { 6623 // Check that there are no default arguments inside the type of this 6624 // parameter. 6625 CheckExtraCXXDefaultArguments(D); 6626 6627 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6628 if (D.getCXXScopeSpec().isSet()) { 6629 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6630 << D.getCXXScopeSpec().getRange(); 6631 D.getCXXScopeSpec().clear(); 6632 } 6633 } 6634 6635 // Ensure we have a valid name 6636 IdentifierInfo *II = 0; 6637 if (D.hasName()) { 6638 II = D.getIdentifier(); 6639 if (!II) { 6640 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6641 << GetNameForDeclarator(D).getName().getAsString(); 6642 D.setInvalidType(true); 6643 } 6644 } 6645 6646 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6647 if (II) { 6648 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6649 ForRedeclaration); 6650 LookupName(R, S); 6651 if (R.isSingleResult()) { 6652 NamedDecl *PrevDecl = R.getFoundDecl(); 6653 if (PrevDecl->isTemplateParameter()) { 6654 // Maybe we will complain about the shadowed template parameter. 6655 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6656 // Just pretend that we didn't see the previous declaration. 6657 PrevDecl = 0; 6658 } else if (S->isDeclScope(PrevDecl)) { 6659 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6660 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6661 6662 // Recover by removing the name 6663 II = 0; 6664 D.SetIdentifier(0, D.getIdentifierLoc()); 6665 D.setInvalidType(true); 6666 } 6667 } 6668 } 6669 6670 // Temporarily put parameter variables in the translation unit, not 6671 // the enclosing context. This prevents them from accidentally 6672 // looking like class members in C++. 6673 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6674 D.getSourceRange().getBegin(), 6675 D.getIdentifierLoc(), II, 6676 parmDeclType, TInfo, 6677 StorageClass, StorageClassAsWritten); 6678 6679 if (D.isInvalidType()) 6680 New->setInvalidDecl(); 6681 6682 assert(S->isFunctionPrototypeScope()); 6683 assert(S->getFunctionPrototypeDepth() >= 1); 6684 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6685 S->getNextFunctionPrototypeIndex()); 6686 6687 // Add the parameter declaration into this scope. 6688 S->AddDecl(New); 6689 if (II) 6690 IdResolver.AddDecl(New); 6691 6692 ProcessDeclAttributes(S, New, D); 6693 6694 if (D.getDeclSpec().isModulePrivateSpecified()) 6695 Diag(New->getLocation(), diag::err_module_private_local) 6696 << 1 << New->getDeclName() 6697 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6698 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6699 6700 if (New->hasAttr<BlocksAttr>()) { 6701 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6702 } 6703 return New; 6704} 6705 6706/// \brief Synthesizes a variable for a parameter arising from a 6707/// typedef. 6708ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6709 SourceLocation Loc, 6710 QualType T) { 6711 /* FIXME: setting StartLoc == Loc. 6712 Would it be worth to modify callers so as to provide proper source 6713 location for the unnamed parameters, embedding the parameter's type? */ 6714 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6715 T, Context.getTrivialTypeSourceInfo(T, Loc), 6716 SC_None, SC_None, 0); 6717 Param->setImplicit(); 6718 return Param; 6719} 6720 6721void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6722 ParmVarDecl * const *ParamEnd) { 6723 // Don't diagnose unused-parameter errors in template instantiations; we 6724 // will already have done so in the template itself. 6725 if (!ActiveTemplateInstantiations.empty()) 6726 return; 6727 6728 for (; Param != ParamEnd; ++Param) { 6729 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6730 !(*Param)->hasAttr<UnusedAttr>()) { 6731 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6732 << (*Param)->getDeclName(); 6733 } 6734 } 6735} 6736 6737void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6738 ParmVarDecl * const *ParamEnd, 6739 QualType ReturnTy, 6740 NamedDecl *D) { 6741 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6742 return; 6743 6744 // Warn if the return value is pass-by-value and larger than the specified 6745 // threshold. 6746 if (ReturnTy.isPODType(Context)) { 6747 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6748 if (Size > LangOpts.NumLargeByValueCopy) 6749 Diag(D->getLocation(), diag::warn_return_value_size) 6750 << D->getDeclName() << Size; 6751 } 6752 6753 // Warn if any parameter is pass-by-value and larger than the specified 6754 // threshold. 6755 for (; Param != ParamEnd; ++Param) { 6756 QualType T = (*Param)->getType(); 6757 if (!T.isPODType(Context)) 6758 continue; 6759 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6760 if (Size > LangOpts.NumLargeByValueCopy) 6761 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6762 << (*Param)->getDeclName() << Size; 6763 } 6764} 6765 6766ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6767 SourceLocation NameLoc, IdentifierInfo *Name, 6768 QualType T, TypeSourceInfo *TSInfo, 6769 VarDecl::StorageClass StorageClass, 6770 VarDecl::StorageClass StorageClassAsWritten) { 6771 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6772 if (getLangOptions().ObjCAutoRefCount && 6773 T.getObjCLifetime() == Qualifiers::OCL_None && 6774 T->isObjCLifetimeType()) { 6775 6776 Qualifiers::ObjCLifetime lifetime; 6777 6778 // Special cases for arrays: 6779 // - if it's const, use __unsafe_unretained 6780 // - otherwise, it's an error 6781 if (T->isArrayType()) { 6782 if (!T.isConstQualified()) { 6783 DelayedDiagnostics.add( 6784 sema::DelayedDiagnostic::makeForbiddenType( 6785 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6786 } 6787 lifetime = Qualifiers::OCL_ExplicitNone; 6788 } else { 6789 lifetime = T->getObjCARCImplicitLifetime(); 6790 } 6791 T = Context.getLifetimeQualifiedType(T, lifetime); 6792 } 6793 6794 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6795 Context.getAdjustedParameterType(T), 6796 TSInfo, 6797 StorageClass, StorageClassAsWritten, 6798 0); 6799 6800 // Parameters can not be abstract class types. 6801 // For record types, this is done by the AbstractClassUsageDiagnoser once 6802 // the class has been completely parsed. 6803 if (!CurContext->isRecord() && 6804 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6805 AbstractParamType)) 6806 New->setInvalidDecl(); 6807 6808 // Parameter declarators cannot be interface types. All ObjC objects are 6809 // passed by reference. 6810 if (T->isObjCObjectType()) { 6811 Diag(NameLoc, 6812 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6813 << FixItHint::CreateInsertion(NameLoc, "*"); 6814 T = Context.getObjCObjectPointerType(T); 6815 New->setType(T); 6816 } 6817 6818 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6819 // duration shall not be qualified by an address-space qualifier." 6820 // Since all parameters have automatic store duration, they can not have 6821 // an address space. 6822 if (T.getAddressSpace() != 0) { 6823 Diag(NameLoc, diag::err_arg_with_address_space); 6824 New->setInvalidDecl(); 6825 } 6826 6827 return New; 6828} 6829 6830void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6831 SourceLocation LocAfterDecls) { 6832 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6833 6834 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6835 // for a K&R function. 6836 if (!FTI.hasPrototype) { 6837 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6838 --i; 6839 if (FTI.ArgInfo[i].Param == 0) { 6840 llvm::SmallString<256> Code; 6841 llvm::raw_svector_ostream(Code) << " int " 6842 << FTI.ArgInfo[i].Ident->getName() 6843 << ";\n"; 6844 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6845 << FTI.ArgInfo[i].Ident 6846 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6847 6848 // Implicitly declare the argument as type 'int' for lack of a better 6849 // type. 6850 AttributeFactory attrs; 6851 DeclSpec DS(attrs); 6852 const char* PrevSpec; // unused 6853 unsigned DiagID; // unused 6854 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6855 PrevSpec, DiagID); 6856 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6857 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6858 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6859 } 6860 } 6861 } 6862} 6863 6864Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6865 Declarator &D) { 6866 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6867 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6868 Scope *ParentScope = FnBodyScope->getParent(); 6869 6870 D.setFunctionDefinition(true); 6871 Decl *DP = HandleDeclarator(ParentScope, D, 6872 MultiTemplateParamsArg(*this)); 6873 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6874} 6875 6876static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6877 // Don't warn about invalid declarations. 6878 if (FD->isInvalidDecl()) 6879 return false; 6880 6881 // Or declarations that aren't global. 6882 if (!FD->isGlobal()) 6883 return false; 6884 6885 // Don't warn about C++ member functions. 6886 if (isa<CXXMethodDecl>(FD)) 6887 return false; 6888 6889 // Don't warn about 'main'. 6890 if (FD->isMain()) 6891 return false; 6892 6893 // Don't warn about inline functions. 6894 if (FD->isInlined()) 6895 return false; 6896 6897 // Don't warn about function templates. 6898 if (FD->getDescribedFunctionTemplate()) 6899 return false; 6900 6901 // Don't warn about function template specializations. 6902 if (FD->isFunctionTemplateSpecialization()) 6903 return false; 6904 6905 bool MissingPrototype = true; 6906 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6907 Prev; Prev = Prev->getPreviousDeclaration()) { 6908 // Ignore any declarations that occur in function or method 6909 // scope, because they aren't visible from the header. 6910 if (Prev->getDeclContext()->isFunctionOrMethod()) 6911 continue; 6912 6913 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6914 break; 6915 } 6916 6917 return MissingPrototype; 6918} 6919 6920void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6921 // Don't complain if we're in GNU89 mode and the previous definition 6922 // was an extern inline function. 6923 const FunctionDecl *Definition; 6924 if (FD->isDefined(Definition) && 6925 !canRedefineFunction(Definition, getLangOptions())) { 6926 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6927 Definition->getStorageClass() == SC_Extern) 6928 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6929 << FD->getDeclName() << getLangOptions().CPlusPlus; 6930 else 6931 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6932 Diag(Definition->getLocation(), diag::note_previous_definition); 6933 } 6934} 6935 6936Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6937 // Clear the last template instantiation error context. 6938 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6939 6940 if (!D) 6941 return D; 6942 FunctionDecl *FD = 0; 6943 6944 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6945 FD = FunTmpl->getTemplatedDecl(); 6946 else 6947 FD = cast<FunctionDecl>(D); 6948 6949 // Enter a new function scope 6950 PushFunctionScope(); 6951 6952 // See if this is a redefinition. 6953 if (!FD->isLateTemplateParsed()) 6954 CheckForFunctionRedefinition(FD); 6955 6956 // Builtin functions cannot be defined. 6957 if (unsigned BuiltinID = FD->getBuiltinID()) { 6958 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6959 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6960 FD->setInvalidDecl(); 6961 } 6962 } 6963 6964 // The return type of a function definition must be complete 6965 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6966 QualType ResultType = FD->getResultType(); 6967 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6968 !FD->isInvalidDecl() && 6969 RequireCompleteType(FD->getLocation(), ResultType, 6970 diag::err_func_def_incomplete_result)) 6971 FD->setInvalidDecl(); 6972 6973 // GNU warning -Wmissing-prototypes: 6974 // Warn if a global function is defined without a previous 6975 // prototype declaration. This warning is issued even if the 6976 // definition itself provides a prototype. The aim is to detect 6977 // global functions that fail to be declared in header files. 6978 if (ShouldWarnAboutMissingPrototype(FD)) 6979 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6980 6981 if (FnBodyScope) 6982 PushDeclContext(FnBodyScope, FD); 6983 6984 // Check the validity of our function parameters 6985 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6986 /*CheckParameterNames=*/true); 6987 6988 // Introduce our parameters into the function scope 6989 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6990 ParmVarDecl *Param = FD->getParamDecl(p); 6991 Param->setOwningFunction(FD); 6992 6993 // If this has an identifier, add it to the scope stack. 6994 if (Param->getIdentifier() && FnBodyScope) { 6995 CheckShadow(FnBodyScope, Param); 6996 6997 PushOnScopeChains(Param, FnBodyScope); 6998 } 6999 } 7000 7001 // Checking attributes of current function definition 7002 // dllimport attribute. 7003 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7004 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7005 // dllimport attribute cannot be directly applied to definition. 7006 // Microsoft accepts dllimport for functions defined within class scope. 7007 if (!DA->isInherited() && 7008 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7009 Diag(FD->getLocation(), 7010 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7011 << "dllimport"; 7012 FD->setInvalidDecl(); 7013 return FD; 7014 } 7015 7016 // Visual C++ appears to not think this is an issue, so only issue 7017 // a warning when Microsoft extensions are disabled. 7018 if (!LangOpts.MicrosoftExt) { 7019 // If a symbol previously declared dllimport is later defined, the 7020 // attribute is ignored in subsequent references, and a warning is 7021 // emitted. 7022 Diag(FD->getLocation(), 7023 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7024 << FD->getName() << "dllimport"; 7025 } 7026 } 7027 return FD; 7028} 7029 7030/// \brief Given the set of return statements within a function body, 7031/// compute the variables that are subject to the named return value 7032/// optimization. 7033/// 7034/// Each of the variables that is subject to the named return value 7035/// optimization will be marked as NRVO variables in the AST, and any 7036/// return statement that has a marked NRVO variable as its NRVO candidate can 7037/// use the named return value optimization. 7038/// 7039/// This function applies a very simplistic algorithm for NRVO: if every return 7040/// statement in the function has the same NRVO candidate, that candidate is 7041/// the NRVO variable. 7042/// 7043/// FIXME: Employ a smarter algorithm that accounts for multiple return 7044/// statements and the lifetimes of the NRVO candidates. We should be able to 7045/// find a maximal set of NRVO variables. 7046void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7047 ReturnStmt **Returns = Scope->Returns.data(); 7048 7049 const VarDecl *NRVOCandidate = 0; 7050 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7051 if (!Returns[I]->getNRVOCandidate()) 7052 return; 7053 7054 if (!NRVOCandidate) 7055 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7056 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7057 return; 7058 } 7059 7060 if (NRVOCandidate) 7061 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7062} 7063 7064Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7065 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7066} 7067 7068Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7069 bool IsInstantiation) { 7070 FunctionDecl *FD = 0; 7071 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7072 if (FunTmpl) 7073 FD = FunTmpl->getTemplatedDecl(); 7074 else 7075 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7076 7077 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7078 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7079 7080 if (FD) { 7081 FD->setBody(Body); 7082 if (FD->isMain()) { 7083 // C and C++ allow for main to automagically return 0. 7084 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7085 FD->setHasImplicitReturnZero(true); 7086 WP.disableCheckFallThrough(); 7087 } else if (FD->hasAttr<NakedAttr>()) { 7088 // If the function is marked 'naked', don't complain about missing return 7089 // statements. 7090 WP.disableCheckFallThrough(); 7091 } 7092 7093 // MSVC permits the use of pure specifier (=0) on function definition, 7094 // defined at class scope, warn about this non standard construct. 7095 if (getLangOptions().MicrosoftExt && FD->isPure()) 7096 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7097 7098 if (!FD->isInvalidDecl()) { 7099 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7100 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7101 FD->getResultType(), FD); 7102 7103 // If this is a constructor, we need a vtable. 7104 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7105 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7106 7107 computeNRVO(Body, getCurFunction()); 7108 } 7109 7110 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7111 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7112 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7113 MD->setBody(Body); 7114 if (Body) 7115 MD->setEndLoc(Body->getLocEnd()); 7116 if (!MD->isInvalidDecl()) { 7117 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7118 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7119 MD->getResultType(), MD); 7120 7121 if (Body) 7122 computeNRVO(Body, getCurFunction()); 7123 } 7124 if (ObjCShouldCallSuperDealloc) { 7125 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7126 ObjCShouldCallSuperDealloc = false; 7127 } 7128 if (ObjCShouldCallSuperFinalize) { 7129 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7130 ObjCShouldCallSuperFinalize = false; 7131 } 7132 } else { 7133 return 0; 7134 } 7135 7136 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7137 "ObjC methods, which should have been handled in the block above."); 7138 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7139 "ObjC methods, which should have been handled in the block above."); 7140 7141 // Verify and clean out per-function state. 7142 if (Body) { 7143 // C++ constructors that have function-try-blocks can't have return 7144 // statements in the handlers of that block. (C++ [except.handle]p14) 7145 // Verify this. 7146 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7147 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7148 7149 // Verify that gotos and switch cases don't jump into scopes illegally. 7150 if (getCurFunction()->NeedsScopeChecking() && 7151 !dcl->isInvalidDecl() && 7152 !hasAnyUnrecoverableErrorsInThisFunction()) 7153 DiagnoseInvalidJumps(Body); 7154 7155 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7156 if (!Destructor->getParent()->isDependentType()) 7157 CheckDestructor(Destructor); 7158 7159 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7160 Destructor->getParent()); 7161 } 7162 7163 // If any errors have occurred, clear out any temporaries that may have 7164 // been leftover. This ensures that these temporaries won't be picked up for 7165 // deletion in some later function. 7166 if (PP.getDiagnostics().hasErrorOccurred() || 7167 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7168 ExprTemporaries.clear(); 7169 ExprNeedsCleanups = false; 7170 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7171 // Since the body is valid, issue any analysis-based warnings that are 7172 // enabled. 7173 ActivePolicy = &WP; 7174 } 7175 7176 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7177 !CheckConstexprFunctionBody(FD, Body)) 7178 FD->setInvalidDecl(); 7179 7180 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 7181 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7182 } 7183 7184 if (!IsInstantiation) 7185 PopDeclContext(); 7186 7187 PopFunctionOrBlockScope(ActivePolicy, dcl); 7188 7189 // If any errors have occurred, clear out any temporaries that may have 7190 // been leftover. This ensures that these temporaries won't be picked up for 7191 // deletion in some later function. 7192 if (getDiagnostics().hasErrorOccurred()) { 7193 ExprTemporaries.clear(); 7194 ExprNeedsCleanups = false; 7195 } 7196 7197 return dcl; 7198} 7199 7200 7201/// When we finish delayed parsing of an attribute, we must attach it to the 7202/// relevant Decl. 7203void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7204 ParsedAttributes &Attrs) { 7205 ProcessDeclAttributeList(S, D, Attrs.getList()); 7206} 7207 7208 7209/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7210/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7211NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7212 IdentifierInfo &II, Scope *S) { 7213 // Before we produce a declaration for an implicitly defined 7214 // function, see whether there was a locally-scoped declaration of 7215 // this name as a function or variable. If so, use that 7216 // (non-visible) declaration, and complain about it. 7217 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7218 = findLocallyScopedExternalDecl(&II); 7219 if (Pos != LocallyScopedExternalDecls.end()) { 7220 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7221 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7222 return Pos->second; 7223 } 7224 7225 // Extension in C99. Legal in C90, but warn about it. 7226 if (II.getName().startswith("__builtin_")) 7227 Diag(Loc, diag::warn_builtin_unknown) << &II; 7228 else if (getLangOptions().C99) 7229 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7230 else 7231 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7232 7233 // Set a Declarator for the implicit definition: int foo(); 7234 const char *Dummy; 7235 AttributeFactory attrFactory; 7236 DeclSpec DS(attrFactory); 7237 unsigned DiagID; 7238 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7239 (void)Error; // Silence warning. 7240 assert(!Error && "Error setting up implicit decl!"); 7241 Declarator D(DS, Declarator::BlockContext); 7242 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7243 0, 0, true, SourceLocation(), 7244 SourceLocation(), SourceLocation(), 7245 SourceLocation(), 7246 EST_None, SourceLocation(), 7247 0, 0, 0, 0, Loc, Loc, D), 7248 DS.getAttributes(), 7249 SourceLocation()); 7250 D.SetIdentifier(&II, Loc); 7251 7252 // Insert this function into translation-unit scope. 7253 7254 DeclContext *PrevDC = CurContext; 7255 CurContext = Context.getTranslationUnitDecl(); 7256 7257 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7258 FD->setImplicit(); 7259 7260 CurContext = PrevDC; 7261 7262 AddKnownFunctionAttributes(FD); 7263 7264 return FD; 7265} 7266 7267/// \brief Adds any function attributes that we know a priori based on 7268/// the declaration of this function. 7269/// 7270/// These attributes can apply both to implicitly-declared builtins 7271/// (like __builtin___printf_chk) or to library-declared functions 7272/// like NSLog or printf. 7273/// 7274/// We need to check for duplicate attributes both here and where user-written 7275/// attributes are applied to declarations. 7276void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7277 if (FD->isInvalidDecl()) 7278 return; 7279 7280 // If this is a built-in function, map its builtin attributes to 7281 // actual attributes. 7282 if (unsigned BuiltinID = FD->getBuiltinID()) { 7283 // Handle printf-formatting attributes. 7284 unsigned FormatIdx; 7285 bool HasVAListArg; 7286 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7287 if (!FD->getAttr<FormatAttr>()) 7288 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7289 "printf", FormatIdx+1, 7290 HasVAListArg ? 0 : FormatIdx+2)); 7291 } 7292 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7293 HasVAListArg)) { 7294 if (!FD->getAttr<FormatAttr>()) 7295 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7296 "scanf", FormatIdx+1, 7297 HasVAListArg ? 0 : FormatIdx+2)); 7298 } 7299 7300 // Mark const if we don't care about errno and that is the only 7301 // thing preventing the function from being const. This allows 7302 // IRgen to use LLVM intrinsics for such functions. 7303 if (!getLangOptions().MathErrno && 7304 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7305 if (!FD->getAttr<ConstAttr>()) 7306 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7307 } 7308 7309 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7310 !FD->getAttr<ReturnsTwiceAttr>()) 7311 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7312 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7313 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7314 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7315 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7316 } 7317 7318 IdentifierInfo *Name = FD->getIdentifier(); 7319 if (!Name) 7320 return; 7321 if ((!getLangOptions().CPlusPlus && 7322 FD->getDeclContext()->isTranslationUnit()) || 7323 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7324 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7325 LinkageSpecDecl::lang_c)) { 7326 // Okay: this could be a libc/libm/Objective-C function we know 7327 // about. 7328 } else 7329 return; 7330 7331 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7332 // FIXME: NSLog and NSLogv should be target specific 7333 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7334 // FIXME: We known better than our headers. 7335 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7336 } else 7337 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7338 "printf", 1, 7339 Name->isStr("NSLogv") ? 0 : 2)); 7340 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7341 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7342 // target-specific builtins, perhaps? 7343 if (!FD->getAttr<FormatAttr>()) 7344 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7345 "printf", 2, 7346 Name->isStr("vasprintf") ? 0 : 3)); 7347 } 7348} 7349 7350TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7351 TypeSourceInfo *TInfo) { 7352 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7353 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7354 7355 if (!TInfo) { 7356 assert(D.isInvalidType() && "no declarator info for valid type"); 7357 TInfo = Context.getTrivialTypeSourceInfo(T); 7358 } 7359 7360 // Scope manipulation handled by caller. 7361 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7362 D.getSourceRange().getBegin(), 7363 D.getIdentifierLoc(), 7364 D.getIdentifier(), 7365 TInfo); 7366 7367 // Bail out immediately if we have an invalid declaration. 7368 if (D.isInvalidType()) { 7369 NewTD->setInvalidDecl(); 7370 return NewTD; 7371 } 7372 7373 if (D.getDeclSpec().isModulePrivateSpecified()) { 7374 if (CurContext->isFunctionOrMethod()) 7375 Diag(NewTD->getLocation(), diag::err_module_private_local) 7376 << 2 << NewTD->getDeclName() 7377 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7378 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7379 else 7380 NewTD->setModulePrivate(); 7381 } 7382 7383 // C++ [dcl.typedef]p8: 7384 // If the typedef declaration defines an unnamed class (or 7385 // enum), the first typedef-name declared by the declaration 7386 // to be that class type (or enum type) is used to denote the 7387 // class type (or enum type) for linkage purposes only. 7388 // We need to check whether the type was declared in the declaration. 7389 switch (D.getDeclSpec().getTypeSpecType()) { 7390 case TST_enum: 7391 case TST_struct: 7392 case TST_union: 7393 case TST_class: { 7394 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7395 7396 // Do nothing if the tag is not anonymous or already has an 7397 // associated typedef (from an earlier typedef in this decl group). 7398 if (tagFromDeclSpec->getIdentifier()) break; 7399 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7400 7401 // A well-formed anonymous tag must always be a TUK_Definition. 7402 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7403 7404 // The type must match the tag exactly; no qualifiers allowed. 7405 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7406 break; 7407 7408 // Otherwise, set this is the anon-decl typedef for the tag. 7409 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7410 break; 7411 } 7412 7413 default: 7414 break; 7415 } 7416 7417 return NewTD; 7418} 7419 7420 7421/// \brief Determine whether a tag with a given kind is acceptable 7422/// as a redeclaration of the given tag declaration. 7423/// 7424/// \returns true if the new tag kind is acceptable, false otherwise. 7425bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7426 TagTypeKind NewTag, bool isDefinition, 7427 SourceLocation NewTagLoc, 7428 const IdentifierInfo &Name) { 7429 // C++ [dcl.type.elab]p3: 7430 // The class-key or enum keyword present in the 7431 // elaborated-type-specifier shall agree in kind with the 7432 // declaration to which the name in the elaborated-type-specifier 7433 // refers. This rule also applies to the form of 7434 // elaborated-type-specifier that declares a class-name or 7435 // friend class since it can be construed as referring to the 7436 // definition of the class. Thus, in any 7437 // elaborated-type-specifier, the enum keyword shall be used to 7438 // refer to an enumeration (7.2), the union class-key shall be 7439 // used to refer to a union (clause 9), and either the class or 7440 // struct class-key shall be used to refer to a class (clause 9) 7441 // declared using the class or struct class-key. 7442 TagTypeKind OldTag = Previous->getTagKind(); 7443 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7444 if (OldTag == NewTag) 7445 return true; 7446 7447 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7448 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7449 // Warn about the struct/class tag mismatch. 7450 bool isTemplate = false; 7451 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7452 isTemplate = Record->getDescribedClassTemplate(); 7453 7454 if (!ActiveTemplateInstantiations.empty()) { 7455 // In a template instantiation, do not offer fix-its for tag mismatches 7456 // since they usually mess up the template instead of fixing the problem. 7457 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7458 << (NewTag == TTK_Class) << isTemplate << &Name; 7459 return true; 7460 } 7461 7462 if (isDefinition) { 7463 // On definitions, check previous tags and issue a fix-it for each 7464 // one that doesn't match the current tag. 7465 if (Previous->getDefinition()) { 7466 // Don't suggest fix-its for redefinitions. 7467 return true; 7468 } 7469 7470 bool previousMismatch = false; 7471 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7472 E(Previous->redecls_end()); I != E; ++I) { 7473 if (I->getTagKind() != NewTag) { 7474 if (!previousMismatch) { 7475 previousMismatch = true; 7476 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7477 << (NewTag == TTK_Class) << isTemplate << &Name; 7478 } 7479 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7480 << (NewTag == TTK_Class) 7481 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7482 NewTag == TTK_Class? 7483 "class" : "struct"); 7484 } 7485 } 7486 return true; 7487 } 7488 7489 // Check for a previous definition. If current tag and definition 7490 // are same type, do nothing. If no definition, but disagree with 7491 // with previous tag type, give a warning, but no fix-it. 7492 const TagDecl *Redecl = Previous->getDefinition() ? 7493 Previous->getDefinition() : Previous; 7494 if (Redecl->getTagKind() == NewTag) { 7495 return true; 7496 } 7497 7498 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7499 << (NewTag == TTK_Class) 7500 << isTemplate << &Name; 7501 Diag(Redecl->getLocation(), diag::note_previous_use); 7502 7503 // If there is a previous defintion, suggest a fix-it. 7504 if (Previous->getDefinition()) { 7505 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7506 << (Redecl->getTagKind() == TTK_Class) 7507 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7508 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7509 } 7510 7511 return true; 7512 } 7513 return false; 7514} 7515 7516/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7517/// former case, Name will be non-null. In the later case, Name will be null. 7518/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7519/// reference/declaration/definition of a tag. 7520Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7521 SourceLocation KWLoc, CXXScopeSpec &SS, 7522 IdentifierInfo *Name, SourceLocation NameLoc, 7523 AttributeList *Attr, AccessSpecifier AS, 7524 SourceLocation ModulePrivateLoc, 7525 MultiTemplateParamsArg TemplateParameterLists, 7526 bool &OwnedDecl, bool &IsDependent, 7527 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7528 TypeResult UnderlyingType) { 7529 // If this is not a definition, it must have a name. 7530 assert((Name != 0 || TUK == TUK_Definition) && 7531 "Nameless record must be a definition!"); 7532 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7533 7534 OwnedDecl = false; 7535 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7536 7537 // FIXME: Check explicit specializations more carefully. 7538 bool isExplicitSpecialization = false; 7539 bool Invalid = false; 7540 7541 // We only need to do this matching if we have template parameters 7542 // or a scope specifier, which also conveniently avoids this work 7543 // for non-C++ cases. 7544 if (TemplateParameterLists.size() > 0 || 7545 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7546 if (TemplateParameterList *TemplateParams 7547 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7548 TemplateParameterLists.get(), 7549 TemplateParameterLists.size(), 7550 TUK == TUK_Friend, 7551 isExplicitSpecialization, 7552 Invalid)) { 7553 if (TemplateParams->size() > 0) { 7554 // This is a declaration or definition of a class template (which may 7555 // be a member of another template). 7556 7557 if (Invalid) 7558 return 0; 7559 7560 OwnedDecl = false; 7561 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7562 SS, Name, NameLoc, Attr, 7563 TemplateParams, AS, 7564 ModulePrivateLoc, 7565 TemplateParameterLists.size() - 1, 7566 (TemplateParameterList**) TemplateParameterLists.release()); 7567 return Result.get(); 7568 } else { 7569 // The "template<>" header is extraneous. 7570 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7571 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7572 isExplicitSpecialization = true; 7573 } 7574 } 7575 } 7576 7577 // Figure out the underlying type if this a enum declaration. We need to do 7578 // this early, because it's needed to detect if this is an incompatible 7579 // redeclaration. 7580 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7581 7582 if (Kind == TTK_Enum) { 7583 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7584 // No underlying type explicitly specified, or we failed to parse the 7585 // type, default to int. 7586 EnumUnderlying = Context.IntTy.getTypePtr(); 7587 else if (UnderlyingType.get()) { 7588 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7589 // integral type; any cv-qualification is ignored. 7590 TypeSourceInfo *TI = 0; 7591 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7592 EnumUnderlying = TI; 7593 7594 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7595 7596 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7597 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7598 << T; 7599 // Recover by falling back to int. 7600 EnumUnderlying = Context.IntTy.getTypePtr(); 7601 } 7602 7603 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7604 UPPC_FixedUnderlyingType)) 7605 EnumUnderlying = Context.IntTy.getTypePtr(); 7606 7607 } else if (getLangOptions().MicrosoftExt) 7608 // Microsoft enums are always of int type. 7609 EnumUnderlying = Context.IntTy.getTypePtr(); 7610 } 7611 7612 DeclContext *SearchDC = CurContext; 7613 DeclContext *DC = CurContext; 7614 bool isStdBadAlloc = false; 7615 7616 RedeclarationKind Redecl = ForRedeclaration; 7617 if (TUK == TUK_Friend || TUK == TUK_Reference) 7618 Redecl = NotForRedeclaration; 7619 7620 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7621 7622 if (Name && SS.isNotEmpty()) { 7623 // We have a nested-name tag ('struct foo::bar'). 7624 7625 // Check for invalid 'foo::'. 7626 if (SS.isInvalid()) { 7627 Name = 0; 7628 goto CreateNewDecl; 7629 } 7630 7631 // If this is a friend or a reference to a class in a dependent 7632 // context, don't try to make a decl for it. 7633 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7634 DC = computeDeclContext(SS, false); 7635 if (!DC) { 7636 IsDependent = true; 7637 return 0; 7638 } 7639 } else { 7640 DC = computeDeclContext(SS, true); 7641 if (!DC) { 7642 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7643 << SS.getRange(); 7644 return 0; 7645 } 7646 } 7647 7648 if (RequireCompleteDeclContext(SS, DC)) 7649 return 0; 7650 7651 SearchDC = DC; 7652 // Look-up name inside 'foo::'. 7653 LookupQualifiedName(Previous, DC); 7654 7655 if (Previous.isAmbiguous()) 7656 return 0; 7657 7658 if (Previous.empty()) { 7659 // Name lookup did not find anything. However, if the 7660 // nested-name-specifier refers to the current instantiation, 7661 // and that current instantiation has any dependent base 7662 // classes, we might find something at instantiation time: treat 7663 // this as a dependent elaborated-type-specifier. 7664 // But this only makes any sense for reference-like lookups. 7665 if (Previous.wasNotFoundInCurrentInstantiation() && 7666 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7667 IsDependent = true; 7668 return 0; 7669 } 7670 7671 // A tag 'foo::bar' must already exist. 7672 Diag(NameLoc, diag::err_not_tag_in_scope) 7673 << Kind << Name << DC << SS.getRange(); 7674 Name = 0; 7675 Invalid = true; 7676 goto CreateNewDecl; 7677 } 7678 } else if (Name) { 7679 // If this is a named struct, check to see if there was a previous forward 7680 // declaration or definition. 7681 // FIXME: We're looking into outer scopes here, even when we 7682 // shouldn't be. Doing so can result in ambiguities that we 7683 // shouldn't be diagnosing. 7684 LookupName(Previous, S); 7685 7686 if (Previous.isAmbiguous() && 7687 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7688 LookupResult::Filter F = Previous.makeFilter(); 7689 while (F.hasNext()) { 7690 NamedDecl *ND = F.next(); 7691 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7692 F.erase(); 7693 } 7694 F.done(); 7695 } 7696 7697 // Note: there used to be some attempt at recovery here. 7698 if (Previous.isAmbiguous()) 7699 return 0; 7700 7701 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7702 // FIXME: This makes sure that we ignore the contexts associated 7703 // with C structs, unions, and enums when looking for a matching 7704 // tag declaration or definition. See the similar lookup tweak 7705 // in Sema::LookupName; is there a better way to deal with this? 7706 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7707 SearchDC = SearchDC->getParent(); 7708 } 7709 } else if (S->isFunctionPrototypeScope()) { 7710 // If this is an enum declaration in function prototype scope, set its 7711 // initial context to the translation unit. 7712 SearchDC = Context.getTranslationUnitDecl(); 7713 } 7714 7715 if (Previous.isSingleResult() && 7716 Previous.getFoundDecl()->isTemplateParameter()) { 7717 // Maybe we will complain about the shadowed template parameter. 7718 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7719 // Just pretend that we didn't see the previous declaration. 7720 Previous.clear(); 7721 } 7722 7723 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7724 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7725 // This is a declaration of or a reference to "std::bad_alloc". 7726 isStdBadAlloc = true; 7727 7728 if (Previous.empty() && StdBadAlloc) { 7729 // std::bad_alloc has been implicitly declared (but made invisible to 7730 // name lookup). Fill in this implicit declaration as the previous 7731 // declaration, so that the declarations get chained appropriately. 7732 Previous.addDecl(getStdBadAlloc()); 7733 } 7734 } 7735 7736 // If we didn't find a previous declaration, and this is a reference 7737 // (or friend reference), move to the correct scope. In C++, we 7738 // also need to do a redeclaration lookup there, just in case 7739 // there's a shadow friend decl. 7740 if (Name && Previous.empty() && 7741 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7742 if (Invalid) goto CreateNewDecl; 7743 assert(SS.isEmpty()); 7744 7745 if (TUK == TUK_Reference) { 7746 // C++ [basic.scope.pdecl]p5: 7747 // -- for an elaborated-type-specifier of the form 7748 // 7749 // class-key identifier 7750 // 7751 // if the elaborated-type-specifier is used in the 7752 // decl-specifier-seq or parameter-declaration-clause of a 7753 // function defined in namespace scope, the identifier is 7754 // declared as a class-name in the namespace that contains 7755 // the declaration; otherwise, except as a friend 7756 // declaration, the identifier is declared in the smallest 7757 // non-class, non-function-prototype scope that contains the 7758 // declaration. 7759 // 7760 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7761 // C structs and unions. 7762 // 7763 // It is an error in C++ to declare (rather than define) an enum 7764 // type, including via an elaborated type specifier. We'll 7765 // diagnose that later; for now, declare the enum in the same 7766 // scope as we would have picked for any other tag type. 7767 // 7768 // GNU C also supports this behavior as part of its incomplete 7769 // enum types extension, while GNU C++ does not. 7770 // 7771 // Find the context where we'll be declaring the tag. 7772 // FIXME: We would like to maintain the current DeclContext as the 7773 // lexical context, 7774 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7775 SearchDC = SearchDC->getParent(); 7776 7777 // Find the scope where we'll be declaring the tag. 7778 while (S->isClassScope() || 7779 (getLangOptions().CPlusPlus && 7780 S->isFunctionPrototypeScope()) || 7781 ((S->getFlags() & Scope::DeclScope) == 0) || 7782 (S->getEntity() && 7783 ((DeclContext *)S->getEntity())->isTransparentContext())) 7784 S = S->getParent(); 7785 } else { 7786 assert(TUK == TUK_Friend); 7787 // C++ [namespace.memdef]p3: 7788 // If a friend declaration in a non-local class first declares a 7789 // class or function, the friend class or function is a member of 7790 // the innermost enclosing namespace. 7791 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7792 } 7793 7794 // In C++, we need to do a redeclaration lookup to properly 7795 // diagnose some problems. 7796 if (getLangOptions().CPlusPlus) { 7797 Previous.setRedeclarationKind(ForRedeclaration); 7798 LookupQualifiedName(Previous, SearchDC); 7799 } 7800 } 7801 7802 if (!Previous.empty()) { 7803 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7804 7805 // It's okay to have a tag decl in the same scope as a typedef 7806 // which hides a tag decl in the same scope. Finding this 7807 // insanity with a redeclaration lookup can only actually happen 7808 // in C++. 7809 // 7810 // This is also okay for elaborated-type-specifiers, which is 7811 // technically forbidden by the current standard but which is 7812 // okay according to the likely resolution of an open issue; 7813 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7814 if (getLangOptions().CPlusPlus) { 7815 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7816 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7817 TagDecl *Tag = TT->getDecl(); 7818 if (Tag->getDeclName() == Name && 7819 Tag->getDeclContext()->getRedeclContext() 7820 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7821 PrevDecl = Tag; 7822 Previous.clear(); 7823 Previous.addDecl(Tag); 7824 Previous.resolveKind(); 7825 } 7826 } 7827 } 7828 } 7829 7830 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7831 // If this is a use of a previous tag, or if the tag is already declared 7832 // in the same scope (so that the definition/declaration completes or 7833 // rementions the tag), reuse the decl. 7834 if (TUK == TUK_Reference || TUK == TUK_Friend || 7835 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7836 // Make sure that this wasn't declared as an enum and now used as a 7837 // struct or something similar. 7838 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7839 TUK == TUK_Definition, KWLoc, 7840 *Name)) { 7841 bool SafeToContinue 7842 = (PrevTagDecl->getTagKind() != TTK_Enum && 7843 Kind != TTK_Enum); 7844 if (SafeToContinue) 7845 Diag(KWLoc, diag::err_use_with_wrong_tag) 7846 << Name 7847 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7848 PrevTagDecl->getKindName()); 7849 else 7850 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7851 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7852 7853 if (SafeToContinue) 7854 Kind = PrevTagDecl->getTagKind(); 7855 else { 7856 // Recover by making this an anonymous redefinition. 7857 Name = 0; 7858 Previous.clear(); 7859 Invalid = true; 7860 } 7861 } 7862 7863 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7864 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7865 7866 // All conflicts with previous declarations are recovered by 7867 // returning the previous declaration. 7868 if (ScopedEnum != PrevEnum->isScoped()) { 7869 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7870 << PrevEnum->isScoped(); 7871 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7872 return PrevTagDecl; 7873 } 7874 else if (EnumUnderlying && PrevEnum->isFixed()) { 7875 QualType T; 7876 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7877 T = TI->getType(); 7878 else 7879 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7880 7881 if (!Context.hasSameUnqualifiedType(T, 7882 PrevEnum->getIntegerType())) { 7883 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7884 diag::err_enum_redeclare_type_mismatch) 7885 << T 7886 << PrevEnum->getIntegerType(); 7887 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7888 return PrevTagDecl; 7889 } 7890 } 7891 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7892 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7893 << PrevEnum->isFixed(); 7894 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7895 return PrevTagDecl; 7896 } 7897 } 7898 7899 if (!Invalid) { 7900 // If this is a use, just return the declaration we found. 7901 7902 // FIXME: In the future, return a variant or some other clue 7903 // for the consumer of this Decl to know it doesn't own it. 7904 // For our current ASTs this shouldn't be a problem, but will 7905 // need to be changed with DeclGroups. 7906 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7907 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7908 return PrevTagDecl; 7909 7910 // Diagnose attempts to redefine a tag. 7911 if (TUK == TUK_Definition) { 7912 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7913 // If we're defining a specialization and the previous definition 7914 // is from an implicit instantiation, don't emit an error 7915 // here; we'll catch this in the general case below. 7916 if (!isExplicitSpecialization || 7917 !isa<CXXRecordDecl>(Def) || 7918 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7919 == TSK_ExplicitSpecialization) { 7920 Diag(NameLoc, diag::err_redefinition) << Name; 7921 Diag(Def->getLocation(), diag::note_previous_definition); 7922 // If this is a redefinition, recover by making this 7923 // struct be anonymous, which will make any later 7924 // references get the previous definition. 7925 Name = 0; 7926 Previous.clear(); 7927 Invalid = true; 7928 } 7929 } else { 7930 // If the type is currently being defined, complain 7931 // about a nested redefinition. 7932 const TagType *Tag 7933 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7934 if (Tag->isBeingDefined()) { 7935 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7936 Diag(PrevTagDecl->getLocation(), 7937 diag::note_previous_definition); 7938 Name = 0; 7939 Previous.clear(); 7940 Invalid = true; 7941 } 7942 } 7943 7944 // Okay, this is definition of a previously declared or referenced 7945 // tag PrevDecl. We're going to create a new Decl for it. 7946 } 7947 } 7948 // If we get here we have (another) forward declaration or we 7949 // have a definition. Just create a new decl. 7950 7951 } else { 7952 // If we get here, this is a definition of a new tag type in a nested 7953 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7954 // new decl/type. We set PrevDecl to NULL so that the entities 7955 // have distinct types. 7956 Previous.clear(); 7957 } 7958 // If we get here, we're going to create a new Decl. If PrevDecl 7959 // is non-NULL, it's a definition of the tag declared by 7960 // PrevDecl. If it's NULL, we have a new definition. 7961 7962 7963 // Otherwise, PrevDecl is not a tag, but was found with tag 7964 // lookup. This is only actually possible in C++, where a few 7965 // things like templates still live in the tag namespace. 7966 } else { 7967 assert(getLangOptions().CPlusPlus); 7968 7969 // Use a better diagnostic if an elaborated-type-specifier 7970 // found the wrong kind of type on the first 7971 // (non-redeclaration) lookup. 7972 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7973 !Previous.isForRedeclaration()) { 7974 unsigned Kind = 0; 7975 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7976 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7977 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7978 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7979 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7980 Invalid = true; 7981 7982 // Otherwise, only diagnose if the declaration is in scope. 7983 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7984 isExplicitSpecialization)) { 7985 // do nothing 7986 7987 // Diagnose implicit declarations introduced by elaborated types. 7988 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7989 unsigned Kind = 0; 7990 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7991 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7992 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7993 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7994 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7995 Invalid = true; 7996 7997 // Otherwise it's a declaration. Call out a particularly common 7998 // case here. 7999 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8000 unsigned Kind = 0; 8001 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8002 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8003 << Name << Kind << TND->getUnderlyingType(); 8004 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8005 Invalid = true; 8006 8007 // Otherwise, diagnose. 8008 } else { 8009 // The tag name clashes with something else in the target scope, 8010 // issue an error and recover by making this tag be anonymous. 8011 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8012 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8013 Name = 0; 8014 Invalid = true; 8015 } 8016 8017 // The existing declaration isn't relevant to us; we're in a 8018 // new scope, so clear out the previous declaration. 8019 Previous.clear(); 8020 } 8021 } 8022 8023CreateNewDecl: 8024 8025 TagDecl *PrevDecl = 0; 8026 if (Previous.isSingleResult()) 8027 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8028 8029 // If there is an identifier, use the location of the identifier as the 8030 // location of the decl, otherwise use the location of the struct/union 8031 // keyword. 8032 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8033 8034 // Otherwise, create a new declaration. If there is a previous 8035 // declaration of the same entity, the two will be linked via 8036 // PrevDecl. 8037 TagDecl *New; 8038 8039 bool IsForwardReference = false; 8040 if (Kind == TTK_Enum) { 8041 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8042 // enum X { A, B, C } D; D should chain to X. 8043 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8044 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8045 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8046 // If this is an undefined enum, warn. 8047 if (TUK != TUK_Definition && !Invalid) { 8048 TagDecl *Def; 8049 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8050 // C++0x: 7.2p2: opaque-enum-declaration. 8051 // Conflicts are diagnosed above. Do nothing. 8052 } 8053 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8054 Diag(Loc, diag::ext_forward_ref_enum_def) 8055 << New; 8056 Diag(Def->getLocation(), diag::note_previous_definition); 8057 } else { 8058 unsigned DiagID = diag::ext_forward_ref_enum; 8059 if (getLangOptions().MicrosoftExt) 8060 DiagID = diag::ext_ms_forward_ref_enum; 8061 else if (getLangOptions().CPlusPlus) 8062 DiagID = diag::err_forward_ref_enum; 8063 Diag(Loc, DiagID); 8064 8065 // If this is a forward-declared reference to an enumeration, make a 8066 // note of it; we won't actually be introducing the declaration into 8067 // the declaration context. 8068 if (TUK == TUK_Reference) 8069 IsForwardReference = true; 8070 } 8071 } 8072 8073 if (EnumUnderlying) { 8074 EnumDecl *ED = cast<EnumDecl>(New); 8075 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8076 ED->setIntegerTypeSourceInfo(TI); 8077 else 8078 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8079 ED->setPromotionType(ED->getIntegerType()); 8080 } 8081 8082 } else { 8083 // struct/union/class 8084 8085 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8086 // struct X { int A; } D; D should chain to X. 8087 if (getLangOptions().CPlusPlus) { 8088 // FIXME: Look for a way to use RecordDecl for simple structs. 8089 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8090 cast_or_null<CXXRecordDecl>(PrevDecl)); 8091 8092 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8093 StdBadAlloc = cast<CXXRecordDecl>(New); 8094 } else 8095 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8096 cast_or_null<RecordDecl>(PrevDecl)); 8097 } 8098 8099 // Maybe add qualifier info. 8100 if (SS.isNotEmpty()) { 8101 if (SS.isSet()) { 8102 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8103 if (TemplateParameterLists.size() > 0) { 8104 New->setTemplateParameterListsInfo(Context, 8105 TemplateParameterLists.size(), 8106 (TemplateParameterList**) TemplateParameterLists.release()); 8107 } 8108 } 8109 else 8110 Invalid = true; 8111 } 8112 8113 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8114 // Add alignment attributes if necessary; these attributes are checked when 8115 // the ASTContext lays out the structure. 8116 // 8117 // It is important for implementing the correct semantics that this 8118 // happen here (in act on tag decl). The #pragma pack stack is 8119 // maintained as a result of parser callbacks which can occur at 8120 // many points during the parsing of a struct declaration (because 8121 // the #pragma tokens are effectively skipped over during the 8122 // parsing of the struct). 8123 AddAlignmentAttributesForRecord(RD); 8124 8125 AddMsStructLayoutForRecord(RD); 8126 } 8127 8128 if (PrevDecl && PrevDecl->isModulePrivate()) 8129 New->setModulePrivate(); 8130 else if (ModulePrivateLoc.isValid()) { 8131 if (isExplicitSpecialization) 8132 Diag(New->getLocation(), diag::err_module_private_specialization) 8133 << 2 8134 << FixItHint::CreateRemoval(ModulePrivateLoc); 8135 else if (PrevDecl && !PrevDecl->isModulePrivate()) 8136 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 8137 // __module_private__ does not apply to local classes. However, we only 8138 // diagnose this as an error when the declaration specifiers are 8139 // freestanding. Here, we just ignore the __module_private__. 8140 // foobar 8141 else if (!SearchDC->isFunctionOrMethod()) 8142 New->setModulePrivate(); 8143 } 8144 8145 // If this is a specialization of a member class (of a class template), 8146 // check the specialization. 8147 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8148 Invalid = true; 8149 8150 if (Invalid) 8151 New->setInvalidDecl(); 8152 8153 if (Attr) 8154 ProcessDeclAttributeList(S, New, Attr); 8155 8156 // If we're declaring or defining a tag in function prototype scope 8157 // in C, note that this type can only be used within the function. 8158 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8159 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8160 8161 // Set the lexical context. If the tag has a C++ scope specifier, the 8162 // lexical context will be different from the semantic context. 8163 New->setLexicalDeclContext(CurContext); 8164 8165 // Mark this as a friend decl if applicable. 8166 // In Microsoft mode, a friend declaration also acts as a forward 8167 // declaration so we always pass true to setObjectOfFriendDecl to make 8168 // the tag name visible. 8169 if (TUK == TUK_Friend) 8170 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8171 getLangOptions().MicrosoftExt); 8172 8173 // Set the access specifier. 8174 if (!Invalid && SearchDC->isRecord()) 8175 SetMemberAccessSpecifier(New, PrevDecl, AS); 8176 8177 if (TUK == TUK_Definition) 8178 New->startDefinition(); 8179 8180 // If this has an identifier, add it to the scope stack. 8181 if (TUK == TUK_Friend) { 8182 // We might be replacing an existing declaration in the lookup tables; 8183 // if so, borrow its access specifier. 8184 if (PrevDecl) 8185 New->setAccess(PrevDecl->getAccess()); 8186 8187 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8188 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8189 if (Name) // can be null along some error paths 8190 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8191 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8192 } else if (Name) { 8193 S = getNonFieldDeclScope(S); 8194 PushOnScopeChains(New, S, !IsForwardReference); 8195 if (IsForwardReference) 8196 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8197 8198 } else { 8199 CurContext->addDecl(New); 8200 } 8201 8202 // If this is the C FILE type, notify the AST context. 8203 if (IdentifierInfo *II = New->getIdentifier()) 8204 if (!New->isInvalidDecl() && 8205 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8206 II->isStr("FILE")) 8207 Context.setFILEDecl(New); 8208 8209 OwnedDecl = true; 8210 return New; 8211} 8212 8213void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8214 AdjustDeclIfTemplate(TagD); 8215 TagDecl *Tag = cast<TagDecl>(TagD); 8216 8217 // Enter the tag context. 8218 PushDeclContext(S, Tag); 8219} 8220 8221Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8222 assert(isa<ObjCContainerDecl>(IDecl) && 8223 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8224 DeclContext *OCD = cast<DeclContext>(IDecl); 8225 assert(getContainingDC(OCD) == CurContext && 8226 "The next DeclContext should be lexically contained in the current one."); 8227 CurContext = OCD; 8228 return IDecl; 8229} 8230 8231void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8232 SourceLocation FinalLoc, 8233 SourceLocation LBraceLoc) { 8234 AdjustDeclIfTemplate(TagD); 8235 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8236 8237 FieldCollector->StartClass(); 8238 8239 if (!Record->getIdentifier()) 8240 return; 8241 8242 if (FinalLoc.isValid()) 8243 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8244 8245 // C++ [class]p2: 8246 // [...] The class-name is also inserted into the scope of the 8247 // class itself; this is known as the injected-class-name. For 8248 // purposes of access checking, the injected-class-name is treated 8249 // as if it were a public member name. 8250 CXXRecordDecl *InjectedClassName 8251 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8252 Record->getLocStart(), Record->getLocation(), 8253 Record->getIdentifier(), 8254 /*PrevDecl=*/0, 8255 /*DelayTypeCreation=*/true); 8256 Context.getTypeDeclType(InjectedClassName, Record); 8257 InjectedClassName->setImplicit(); 8258 InjectedClassName->setAccess(AS_public); 8259 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8260 InjectedClassName->setDescribedClassTemplate(Template); 8261 PushOnScopeChains(InjectedClassName, S); 8262 assert(InjectedClassName->isInjectedClassName() && 8263 "Broken injected-class-name"); 8264} 8265 8266void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8267 SourceLocation RBraceLoc) { 8268 AdjustDeclIfTemplate(TagD); 8269 TagDecl *Tag = cast<TagDecl>(TagD); 8270 Tag->setRBraceLoc(RBraceLoc); 8271 8272 if (isa<CXXRecordDecl>(Tag)) 8273 FieldCollector->FinishClass(); 8274 8275 // Exit this scope of this tag's definition. 8276 PopDeclContext(); 8277 8278 // Notify the consumer that we've defined a tag. 8279 Consumer.HandleTagDeclDefinition(Tag); 8280} 8281 8282void Sema::ActOnObjCContainerFinishDefinition() { 8283 // Exit this scope of this interface definition. 8284 PopDeclContext(); 8285} 8286 8287void Sema::ActOnObjCTemporaryExitContainerContext() { 8288 OriginalLexicalContext = CurContext; 8289 ActOnObjCContainerFinishDefinition(); 8290} 8291 8292void Sema::ActOnObjCReenterContainerContext() { 8293 ActOnObjCContainerStartDefinition(cast<Decl>(OriginalLexicalContext)); 8294 OriginalLexicalContext = 0; 8295} 8296 8297void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8298 AdjustDeclIfTemplate(TagD); 8299 TagDecl *Tag = cast<TagDecl>(TagD); 8300 Tag->setInvalidDecl(); 8301 8302 // We're undoing ActOnTagStartDefinition here, not 8303 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8304 // the FieldCollector. 8305 8306 PopDeclContext(); 8307} 8308 8309// Note that FieldName may be null for anonymous bitfields. 8310bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8311 QualType FieldTy, const Expr *BitWidth, 8312 bool *ZeroWidth) { 8313 // Default to true; that shouldn't confuse checks for emptiness 8314 if (ZeroWidth) 8315 *ZeroWidth = true; 8316 8317 // C99 6.7.2.1p4 - verify the field type. 8318 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8319 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8320 // Handle incomplete types with specific error. 8321 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8322 return true; 8323 if (FieldName) 8324 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8325 << FieldName << FieldTy << BitWidth->getSourceRange(); 8326 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8327 << FieldTy << BitWidth->getSourceRange(); 8328 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8329 UPPC_BitFieldWidth)) 8330 return true; 8331 8332 // If the bit-width is type- or value-dependent, don't try to check 8333 // it now. 8334 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8335 return false; 8336 8337 llvm::APSInt Value; 8338 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8339 return true; 8340 8341 if (Value != 0 && ZeroWidth) 8342 *ZeroWidth = false; 8343 8344 // Zero-width bitfield is ok for anonymous field. 8345 if (Value == 0 && FieldName) 8346 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8347 8348 if (Value.isSigned() && Value.isNegative()) { 8349 if (FieldName) 8350 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8351 << FieldName << Value.toString(10); 8352 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8353 << Value.toString(10); 8354 } 8355 8356 if (!FieldTy->isDependentType()) { 8357 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8358 if (Value.getZExtValue() > TypeSize) { 8359 if (!getLangOptions().CPlusPlus) { 8360 if (FieldName) 8361 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8362 << FieldName << (unsigned)Value.getZExtValue() 8363 << (unsigned)TypeSize; 8364 8365 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8366 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8367 } 8368 8369 if (FieldName) 8370 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8371 << FieldName << (unsigned)Value.getZExtValue() 8372 << (unsigned)TypeSize; 8373 else 8374 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8375 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8376 } 8377 } 8378 8379 return false; 8380} 8381 8382/// ActOnField - Each field of a C struct/union is passed into this in order 8383/// to create a FieldDecl object for it. 8384Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8385 Declarator &D, Expr *BitfieldWidth) { 8386 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8387 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8388 /*HasInit=*/false, AS_public); 8389 return Res; 8390} 8391 8392/// HandleField - Analyze a field of a C struct or a C++ data member. 8393/// 8394FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8395 SourceLocation DeclStart, 8396 Declarator &D, Expr *BitWidth, bool HasInit, 8397 AccessSpecifier AS) { 8398 IdentifierInfo *II = D.getIdentifier(); 8399 SourceLocation Loc = DeclStart; 8400 if (II) Loc = D.getIdentifierLoc(); 8401 8402 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8403 QualType T = TInfo->getType(); 8404 if (getLangOptions().CPlusPlus) { 8405 CheckExtraCXXDefaultArguments(D); 8406 8407 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8408 UPPC_DataMemberType)) { 8409 D.setInvalidType(); 8410 T = Context.IntTy; 8411 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8412 } 8413 } 8414 8415 DiagnoseFunctionSpecifiers(D); 8416 8417 if (D.getDeclSpec().isThreadSpecified()) 8418 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8419 if (D.getDeclSpec().isConstexprSpecified()) 8420 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8421 << 2; 8422 8423 // Check to see if this name was declared as a member previously 8424 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8425 LookupName(Previous, S); 8426 assert((Previous.empty() || Previous.isOverloadedResult() || 8427 Previous.isSingleResult()) 8428 && "Lookup of member name should be either overloaded, single or null"); 8429 8430 // If the name is overloaded then get any declaration else get the single 8431 // result 8432 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8433 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8434 8435 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8436 // Maybe we will complain about the shadowed template parameter. 8437 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8438 // Just pretend that we didn't see the previous declaration. 8439 PrevDecl = 0; 8440 } 8441 8442 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8443 PrevDecl = 0; 8444 8445 bool Mutable 8446 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8447 SourceLocation TSSL = D.getSourceRange().getBegin(); 8448 FieldDecl *NewFD 8449 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8450 TSSL, AS, PrevDecl, &D); 8451 8452 if (NewFD->isInvalidDecl()) 8453 Record->setInvalidDecl(); 8454 8455 if (D.getDeclSpec().isModulePrivateSpecified()) 8456 NewFD->setModulePrivate(); 8457 8458 if (NewFD->isInvalidDecl() && PrevDecl) { 8459 // Don't introduce NewFD into scope; there's already something 8460 // with the same name in the same scope. 8461 } else if (II) { 8462 PushOnScopeChains(NewFD, S); 8463 } else 8464 Record->addDecl(NewFD); 8465 8466 return NewFD; 8467} 8468 8469/// \brief Build a new FieldDecl and check its well-formedness. 8470/// 8471/// This routine builds a new FieldDecl given the fields name, type, 8472/// record, etc. \p PrevDecl should refer to any previous declaration 8473/// with the same name and in the same scope as the field to be 8474/// created. 8475/// 8476/// \returns a new FieldDecl. 8477/// 8478/// \todo The Declarator argument is a hack. It will be removed once 8479FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8480 TypeSourceInfo *TInfo, 8481 RecordDecl *Record, SourceLocation Loc, 8482 bool Mutable, Expr *BitWidth, bool HasInit, 8483 SourceLocation TSSL, 8484 AccessSpecifier AS, NamedDecl *PrevDecl, 8485 Declarator *D) { 8486 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8487 bool InvalidDecl = false; 8488 if (D) InvalidDecl = D->isInvalidType(); 8489 8490 // If we receive a broken type, recover by assuming 'int' and 8491 // marking this declaration as invalid. 8492 if (T.isNull()) { 8493 InvalidDecl = true; 8494 T = Context.IntTy; 8495 } 8496 8497 QualType EltTy = Context.getBaseElementType(T); 8498 if (!EltTy->isDependentType() && 8499 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8500 // Fields of incomplete type force their record to be invalid. 8501 Record->setInvalidDecl(); 8502 InvalidDecl = true; 8503 } 8504 8505 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8506 // than a variably modified type. 8507 if (!InvalidDecl && T->isVariablyModifiedType()) { 8508 bool SizeIsNegative; 8509 llvm::APSInt Oversized; 8510 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8511 SizeIsNegative, 8512 Oversized); 8513 if (!FixedTy.isNull()) { 8514 Diag(Loc, diag::warn_illegal_constant_array_size); 8515 T = FixedTy; 8516 } else { 8517 if (SizeIsNegative) 8518 Diag(Loc, diag::err_typecheck_negative_array_size); 8519 else if (Oversized.getBoolValue()) 8520 Diag(Loc, diag::err_array_too_large) 8521 << Oversized.toString(10); 8522 else 8523 Diag(Loc, diag::err_typecheck_field_variable_size); 8524 InvalidDecl = true; 8525 } 8526 } 8527 8528 // Fields can not have abstract class types 8529 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8530 diag::err_abstract_type_in_decl, 8531 AbstractFieldType)) 8532 InvalidDecl = true; 8533 8534 bool ZeroWidth = false; 8535 // If this is declared as a bit-field, check the bit-field. 8536 if (!InvalidDecl && BitWidth && 8537 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8538 InvalidDecl = true; 8539 BitWidth = 0; 8540 ZeroWidth = false; 8541 } 8542 8543 // Check that 'mutable' is consistent with the type of the declaration. 8544 if (!InvalidDecl && Mutable) { 8545 unsigned DiagID = 0; 8546 if (T->isReferenceType()) 8547 DiagID = diag::err_mutable_reference; 8548 else if (T.isConstQualified()) 8549 DiagID = diag::err_mutable_const; 8550 8551 if (DiagID) { 8552 SourceLocation ErrLoc = Loc; 8553 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8554 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8555 Diag(ErrLoc, DiagID); 8556 Mutable = false; 8557 InvalidDecl = true; 8558 } 8559 } 8560 8561 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8562 BitWidth, Mutable, HasInit); 8563 if (InvalidDecl) 8564 NewFD->setInvalidDecl(); 8565 8566 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8567 Diag(Loc, diag::err_duplicate_member) << II; 8568 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8569 NewFD->setInvalidDecl(); 8570 } 8571 8572 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8573 if (Record->isUnion()) { 8574 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8575 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8576 if (RDecl->getDefinition()) { 8577 // C++ [class.union]p1: An object of a class with a non-trivial 8578 // constructor, a non-trivial copy constructor, a non-trivial 8579 // destructor, or a non-trivial copy assignment operator 8580 // cannot be a member of a union, nor can an array of such 8581 // objects. 8582 if (CheckNontrivialField(NewFD)) 8583 NewFD->setInvalidDecl(); 8584 } 8585 } 8586 8587 // C++ [class.union]p1: If a union contains a member of reference type, 8588 // the program is ill-formed. 8589 if (EltTy->isReferenceType()) { 8590 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8591 << NewFD->getDeclName() << EltTy; 8592 NewFD->setInvalidDecl(); 8593 } 8594 } 8595 } 8596 8597 // FIXME: We need to pass in the attributes given an AST 8598 // representation, not a parser representation. 8599 if (D) 8600 // FIXME: What to pass instead of TUScope? 8601 ProcessDeclAttributes(TUScope, NewFD, *D); 8602 8603 // In auto-retain/release, infer strong retension for fields of 8604 // retainable type. 8605 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8606 NewFD->setInvalidDecl(); 8607 8608 if (T.isObjCGCWeak()) 8609 Diag(Loc, diag::warn_attribute_weak_on_field); 8610 8611 NewFD->setAccess(AS); 8612 return NewFD; 8613} 8614 8615bool Sema::CheckNontrivialField(FieldDecl *FD) { 8616 assert(FD); 8617 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8618 8619 if (FD->isInvalidDecl()) 8620 return true; 8621 8622 QualType EltTy = Context.getBaseElementType(FD->getType()); 8623 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8624 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8625 if (RDecl->getDefinition()) { 8626 // We check for copy constructors before constructors 8627 // because otherwise we'll never get complaints about 8628 // copy constructors. 8629 8630 CXXSpecialMember member = CXXInvalid; 8631 if (!RDecl->hasTrivialCopyConstructor()) 8632 member = CXXCopyConstructor; 8633 else if (!RDecl->hasTrivialDefaultConstructor()) 8634 member = CXXDefaultConstructor; 8635 else if (!RDecl->hasTrivialCopyAssignment()) 8636 member = CXXCopyAssignment; 8637 else if (!RDecl->hasTrivialDestructor()) 8638 member = CXXDestructor; 8639 8640 if (member != CXXInvalid) { 8641 if (!getLangOptions().CPlusPlus0x && 8642 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8643 // Objective-C++ ARC: it is an error to have a non-trivial field of 8644 // a union. However, system headers in Objective-C programs 8645 // occasionally have Objective-C lifetime objects within unions, 8646 // and rather than cause the program to fail, we make those 8647 // members unavailable. 8648 SourceLocation Loc = FD->getLocation(); 8649 if (getSourceManager().isInSystemHeader(Loc)) { 8650 if (!FD->hasAttr<UnavailableAttr>()) 8651 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8652 "this system field has retaining ownership")); 8653 return false; 8654 } 8655 } 8656 8657 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8658 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8659 diag::err_illegal_union_or_anon_struct_member) 8660 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8661 DiagnoseNontrivial(RT, member); 8662 return !getLangOptions().CPlusPlus0x; 8663 } 8664 } 8665 } 8666 8667 return false; 8668} 8669 8670/// DiagnoseNontrivial - Given that a class has a non-trivial 8671/// special member, figure out why. 8672void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8673 QualType QT(T, 0U); 8674 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8675 8676 // Check whether the member was user-declared. 8677 switch (member) { 8678 case CXXInvalid: 8679 break; 8680 8681 case CXXDefaultConstructor: 8682 if (RD->hasUserDeclaredConstructor()) { 8683 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8684 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8685 const FunctionDecl *body = 0; 8686 ci->hasBody(body); 8687 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8688 SourceLocation CtorLoc = ci->getLocation(); 8689 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8690 return; 8691 } 8692 } 8693 8694 llvm_unreachable("found no user-declared constructors"); 8695 } 8696 break; 8697 8698 case CXXCopyConstructor: 8699 if (RD->hasUserDeclaredCopyConstructor()) { 8700 SourceLocation CtorLoc = 8701 RD->getCopyConstructor(0)->getLocation(); 8702 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8703 return; 8704 } 8705 break; 8706 8707 case CXXMoveConstructor: 8708 if (RD->hasUserDeclaredMoveConstructor()) { 8709 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8710 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8711 return; 8712 } 8713 break; 8714 8715 case CXXCopyAssignment: 8716 if (RD->hasUserDeclaredCopyAssignment()) { 8717 // FIXME: this should use the location of the copy 8718 // assignment, not the type. 8719 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8720 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8721 return; 8722 } 8723 break; 8724 8725 case CXXMoveAssignment: 8726 if (RD->hasUserDeclaredMoveAssignment()) { 8727 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8728 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8729 return; 8730 } 8731 break; 8732 8733 case CXXDestructor: 8734 if (RD->hasUserDeclaredDestructor()) { 8735 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8736 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8737 return; 8738 } 8739 break; 8740 } 8741 8742 typedef CXXRecordDecl::base_class_iterator base_iter; 8743 8744 // Virtual bases and members inhibit trivial copying/construction, 8745 // but not trivial destruction. 8746 if (member != CXXDestructor) { 8747 // Check for virtual bases. vbases includes indirect virtual bases, 8748 // so we just iterate through the direct bases. 8749 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8750 if (bi->isVirtual()) { 8751 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8752 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8753 return; 8754 } 8755 8756 // Check for virtual methods. 8757 typedef CXXRecordDecl::method_iterator meth_iter; 8758 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8759 ++mi) { 8760 if (mi->isVirtual()) { 8761 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8762 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8763 return; 8764 } 8765 } 8766 } 8767 8768 bool (CXXRecordDecl::*hasTrivial)() const; 8769 switch (member) { 8770 case CXXDefaultConstructor: 8771 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8772 case CXXCopyConstructor: 8773 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8774 case CXXCopyAssignment: 8775 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8776 case CXXDestructor: 8777 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8778 default: 8779 llvm_unreachable("unexpected special member"); 8780 } 8781 8782 // Check for nontrivial bases (and recurse). 8783 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8784 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8785 assert(BaseRT && "Don't know how to handle dependent bases"); 8786 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8787 if (!(BaseRecTy->*hasTrivial)()) { 8788 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8789 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8790 DiagnoseNontrivial(BaseRT, member); 8791 return; 8792 } 8793 } 8794 8795 // Check for nontrivial members (and recurse). 8796 typedef RecordDecl::field_iterator field_iter; 8797 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8798 ++fi) { 8799 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8800 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8801 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8802 8803 if (!(EltRD->*hasTrivial)()) { 8804 SourceLocation FLoc = (*fi)->getLocation(); 8805 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8806 DiagnoseNontrivial(EltRT, member); 8807 return; 8808 } 8809 } 8810 8811 if (EltTy->isObjCLifetimeType()) { 8812 switch (EltTy.getObjCLifetime()) { 8813 case Qualifiers::OCL_None: 8814 case Qualifiers::OCL_ExplicitNone: 8815 break; 8816 8817 case Qualifiers::OCL_Autoreleasing: 8818 case Qualifiers::OCL_Weak: 8819 case Qualifiers::OCL_Strong: 8820 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8821 << QT << EltTy.getObjCLifetime(); 8822 return; 8823 } 8824 } 8825 } 8826 8827 llvm_unreachable("found no explanation for non-trivial member"); 8828} 8829 8830/// TranslateIvarVisibility - Translate visibility from a token ID to an 8831/// AST enum value. 8832static ObjCIvarDecl::AccessControl 8833TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8834 switch (ivarVisibility) { 8835 default: llvm_unreachable("Unknown visitibility kind"); 8836 case tok::objc_private: return ObjCIvarDecl::Private; 8837 case tok::objc_public: return ObjCIvarDecl::Public; 8838 case tok::objc_protected: return ObjCIvarDecl::Protected; 8839 case tok::objc_package: return ObjCIvarDecl::Package; 8840 } 8841} 8842 8843/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8844/// in order to create an IvarDecl object for it. 8845Decl *Sema::ActOnIvar(Scope *S, 8846 SourceLocation DeclStart, 8847 Declarator &D, Expr *BitfieldWidth, 8848 tok::ObjCKeywordKind Visibility) { 8849 8850 IdentifierInfo *II = D.getIdentifier(); 8851 Expr *BitWidth = (Expr*)BitfieldWidth; 8852 SourceLocation Loc = DeclStart; 8853 if (II) Loc = D.getIdentifierLoc(); 8854 8855 // FIXME: Unnamed fields can be handled in various different ways, for 8856 // example, unnamed unions inject all members into the struct namespace! 8857 8858 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8859 QualType T = TInfo->getType(); 8860 8861 if (BitWidth) { 8862 // 6.7.2.1p3, 6.7.2.1p4 8863 if (VerifyBitField(Loc, II, T, BitWidth)) { 8864 D.setInvalidType(); 8865 BitWidth = 0; 8866 } 8867 } else { 8868 // Not a bitfield. 8869 8870 // validate II. 8871 8872 } 8873 if (T->isReferenceType()) { 8874 Diag(Loc, diag::err_ivar_reference_type); 8875 D.setInvalidType(); 8876 } 8877 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8878 // than a variably modified type. 8879 else if (T->isVariablyModifiedType()) { 8880 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8881 D.setInvalidType(); 8882 } 8883 8884 // Get the visibility (access control) for this ivar. 8885 ObjCIvarDecl::AccessControl ac = 8886 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8887 : ObjCIvarDecl::None; 8888 // Must set ivar's DeclContext to its enclosing interface. 8889 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8890 ObjCContainerDecl *EnclosingContext; 8891 if (ObjCImplementationDecl *IMPDecl = 8892 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8893 if (!LangOpts.ObjCNonFragileABI2) { 8894 // Case of ivar declared in an implementation. Context is that of its class. 8895 EnclosingContext = IMPDecl->getClassInterface(); 8896 assert(EnclosingContext && "Implementation has no class interface!"); 8897 } 8898 else 8899 EnclosingContext = EnclosingDecl; 8900 } else { 8901 if (ObjCCategoryDecl *CDecl = 8902 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8903 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8904 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8905 return 0; 8906 } 8907 } 8908 EnclosingContext = EnclosingDecl; 8909 } 8910 8911 // Construct the decl. 8912 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8913 DeclStart, Loc, II, T, 8914 TInfo, ac, (Expr *)BitfieldWidth); 8915 8916 if (II) { 8917 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8918 ForRedeclaration); 8919 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8920 && !isa<TagDecl>(PrevDecl)) { 8921 Diag(Loc, diag::err_duplicate_member) << II; 8922 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8923 NewID->setInvalidDecl(); 8924 } 8925 } 8926 8927 // Process attributes attached to the ivar. 8928 ProcessDeclAttributes(S, NewID, D); 8929 8930 if (D.isInvalidType()) 8931 NewID->setInvalidDecl(); 8932 8933 // In ARC, infer 'retaining' for ivars of retainable type. 8934 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8935 NewID->setInvalidDecl(); 8936 8937 if (D.getDeclSpec().isModulePrivateSpecified()) 8938 NewID->setModulePrivate(); 8939 8940 if (II) { 8941 // FIXME: When interfaces are DeclContexts, we'll need to add 8942 // these to the interface. 8943 S->AddDecl(NewID); 8944 IdResolver.AddDecl(NewID); 8945 } 8946 8947 return NewID; 8948} 8949 8950/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8951/// class and class extensions. For every class @interface and class 8952/// extension @interface, if the last ivar is a bitfield of any type, 8953/// then add an implicit `char :0` ivar to the end of that interface. 8954void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8955 SmallVectorImpl<Decl *> &AllIvarDecls) { 8956 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8957 return; 8958 8959 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8960 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8961 8962 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 8963 return; 8964 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8965 if (!ID) { 8966 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8967 if (!CD->IsClassExtension()) 8968 return; 8969 } 8970 // No need to add this to end of @implementation. 8971 else 8972 return; 8973 } 8974 // All conditions are met. Add a new bitfield to the tail end of ivars. 8975 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8976 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8977 8978 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8979 DeclLoc, DeclLoc, 0, 8980 Context.CharTy, 8981 Context.getTrivialTypeSourceInfo(Context.CharTy, 8982 DeclLoc), 8983 ObjCIvarDecl::Private, BW, 8984 true); 8985 AllIvarDecls.push_back(Ivar); 8986} 8987 8988void Sema::ActOnFields(Scope* S, 8989 SourceLocation RecLoc, Decl *EnclosingDecl, 8990 llvm::ArrayRef<Decl *> Fields, 8991 SourceLocation LBrac, SourceLocation RBrac, 8992 AttributeList *Attr) { 8993 assert(EnclosingDecl && "missing record or interface decl"); 8994 8995 // If the decl this is being inserted into is invalid, then it may be a 8996 // redeclaration or some other bogus case. Don't try to add fields to it. 8997 if (EnclosingDecl->isInvalidDecl()) 8998 return; 8999 9000 // Verify that all the fields are okay. 9001 unsigned NumNamedMembers = 0; 9002 SmallVector<FieldDecl*, 32> RecFields; 9003 9004 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9005 bool ARCErrReported = false; 9006 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9007 i != end; ++i) { 9008 FieldDecl *FD = cast<FieldDecl>(*i); 9009 9010 // Get the type for the field. 9011 const Type *FDTy = FD->getType().getTypePtr(); 9012 9013 if (!FD->isAnonymousStructOrUnion()) { 9014 // Remember all fields written by the user. 9015 RecFields.push_back(FD); 9016 } 9017 9018 // If the field is already invalid for some reason, don't emit more 9019 // diagnostics about it. 9020 if (FD->isInvalidDecl()) { 9021 EnclosingDecl->setInvalidDecl(); 9022 continue; 9023 } 9024 9025 // C99 6.7.2.1p2: 9026 // A structure or union shall not contain a member with 9027 // incomplete or function type (hence, a structure shall not 9028 // contain an instance of itself, but may contain a pointer to 9029 // an instance of itself), except that the last member of a 9030 // structure with more than one named member may have incomplete 9031 // array type; such a structure (and any union containing, 9032 // possibly recursively, a member that is such a structure) 9033 // shall not be a member of a structure or an element of an 9034 // array. 9035 if (FDTy->isFunctionType()) { 9036 // Field declared as a function. 9037 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9038 << FD->getDeclName(); 9039 FD->setInvalidDecl(); 9040 EnclosingDecl->setInvalidDecl(); 9041 continue; 9042 } else if (FDTy->isIncompleteArrayType() && Record && 9043 ((i + 1 == Fields.end() && !Record->isUnion()) || 9044 ((getLangOptions().MicrosoftExt || 9045 getLangOptions().CPlusPlus) && 9046 (i + 1 == Fields.end() || Record->isUnion())))) { 9047 // Flexible array member. 9048 // Microsoft and g++ is more permissive regarding flexible array. 9049 // It will accept flexible array in union and also 9050 // as the sole element of a struct/class. 9051 if (getLangOptions().MicrosoftExt) { 9052 if (Record->isUnion()) 9053 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9054 << FD->getDeclName(); 9055 else if (Fields.size() == 1) 9056 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9057 << FD->getDeclName() << Record->getTagKind(); 9058 } else if (getLangOptions().CPlusPlus) { 9059 if (Record->isUnion()) 9060 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9061 << FD->getDeclName(); 9062 else if (Fields.size() == 1) 9063 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9064 << FD->getDeclName() << Record->getTagKind(); 9065 } else if (NumNamedMembers < 1) { 9066 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9067 << FD->getDeclName(); 9068 FD->setInvalidDecl(); 9069 EnclosingDecl->setInvalidDecl(); 9070 continue; 9071 } 9072 if (!FD->getType()->isDependentType() && 9073 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9074 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9075 << FD->getDeclName() << FD->getType(); 9076 FD->setInvalidDecl(); 9077 EnclosingDecl->setInvalidDecl(); 9078 continue; 9079 } 9080 // Okay, we have a legal flexible array member at the end of the struct. 9081 if (Record) 9082 Record->setHasFlexibleArrayMember(true); 9083 } else if (!FDTy->isDependentType() && 9084 RequireCompleteType(FD->getLocation(), FD->getType(), 9085 diag::err_field_incomplete)) { 9086 // Incomplete type 9087 FD->setInvalidDecl(); 9088 EnclosingDecl->setInvalidDecl(); 9089 continue; 9090 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9091 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9092 // If this is a member of a union, then entire union becomes "flexible". 9093 if (Record && Record->isUnion()) { 9094 Record->setHasFlexibleArrayMember(true); 9095 } else { 9096 // If this is a struct/class and this is not the last element, reject 9097 // it. Note that GCC supports variable sized arrays in the middle of 9098 // structures. 9099 if (i + 1 != Fields.end()) 9100 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9101 << FD->getDeclName() << FD->getType(); 9102 else { 9103 // We support flexible arrays at the end of structs in 9104 // other structs as an extension. 9105 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9106 << FD->getDeclName(); 9107 if (Record) 9108 Record->setHasFlexibleArrayMember(true); 9109 } 9110 } 9111 } 9112 if (Record && FDTTy->getDecl()->hasObjectMember()) 9113 Record->setHasObjectMember(true); 9114 } else if (FDTy->isObjCObjectType()) { 9115 /// A field cannot be an Objective-c object 9116 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9117 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9118 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9119 FD->setType(T); 9120 } 9121 else if (!getLangOptions().CPlusPlus) { 9122 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9123 // It's an error in ARC if a field has lifetime. 9124 // We don't want to report this in a system header, though, 9125 // so we just make the field unavailable. 9126 // FIXME: that's really not sufficient; we need to make the type 9127 // itself invalid to, say, initialize or copy. 9128 QualType T = FD->getType(); 9129 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9130 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9131 SourceLocation loc = FD->getLocation(); 9132 if (getSourceManager().isInSystemHeader(loc)) { 9133 if (!FD->hasAttr<UnavailableAttr>()) { 9134 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9135 "this system field has retaining ownership")); 9136 } 9137 } else { 9138 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 9139 } 9140 ARCErrReported = true; 9141 } 9142 } 9143 else if (getLangOptions().ObjC1 && 9144 getLangOptions().getGC() != LangOptions::NonGC && 9145 Record && !Record->hasObjectMember()) { 9146 if (FD->getType()->isObjCObjectPointerType() || 9147 FD->getType().isObjCGCStrong()) 9148 Record->setHasObjectMember(true); 9149 else if (Context.getAsArrayType(FD->getType())) { 9150 QualType BaseType = Context.getBaseElementType(FD->getType()); 9151 if (BaseType->isRecordType() && 9152 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9153 Record->setHasObjectMember(true); 9154 else if (BaseType->isObjCObjectPointerType() || 9155 BaseType.isObjCGCStrong()) 9156 Record->setHasObjectMember(true); 9157 } 9158 } 9159 } 9160 // Keep track of the number of named members. 9161 if (FD->getIdentifier()) 9162 ++NumNamedMembers; 9163 } 9164 9165 // Okay, we successfully defined 'Record'. 9166 if (Record) { 9167 bool Completed = false; 9168 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9169 if (!CXXRecord->isInvalidDecl()) { 9170 // Set access bits correctly on the directly-declared conversions. 9171 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9172 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9173 I != E; ++I) 9174 Convs->setAccess(I, (*I)->getAccess()); 9175 9176 if (!CXXRecord->isDependentType()) { 9177 // Objective-C Automatic Reference Counting: 9178 // If a class has a non-static data member of Objective-C pointer 9179 // type (or array thereof), it is a non-POD type and its 9180 // default constructor (if any), copy constructor, copy assignment 9181 // operator, and destructor are non-trivial. 9182 // 9183 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9184 // However, here we check whether this particular class is only 9185 // non-POD because of the presence of an Objective-C pointer member. 9186 // If so, objects of this type cannot be shared between code compiled 9187 // with instant objects and code compiled with manual retain/release. 9188 if (getLangOptions().ObjCAutoRefCount && 9189 CXXRecord->hasObjectMember() && 9190 CXXRecord->getLinkage() == ExternalLinkage) { 9191 if (CXXRecord->isPOD()) { 9192 Diag(CXXRecord->getLocation(), 9193 diag::warn_arc_non_pod_class_with_object_member) 9194 << CXXRecord; 9195 } else { 9196 // FIXME: Fix-Its would be nice here, but finding a good location 9197 // for them is going to be tricky. 9198 if (CXXRecord->hasTrivialCopyConstructor()) 9199 Diag(CXXRecord->getLocation(), 9200 diag::warn_arc_trivial_member_function_with_object_member) 9201 << CXXRecord << 0; 9202 if (CXXRecord->hasTrivialCopyAssignment()) 9203 Diag(CXXRecord->getLocation(), 9204 diag::warn_arc_trivial_member_function_with_object_member) 9205 << CXXRecord << 1; 9206 if (CXXRecord->hasTrivialDestructor()) 9207 Diag(CXXRecord->getLocation(), 9208 diag::warn_arc_trivial_member_function_with_object_member) 9209 << CXXRecord << 2; 9210 } 9211 } 9212 9213 // Adjust user-defined destructor exception spec. 9214 if (getLangOptions().CPlusPlus0x && 9215 CXXRecord->hasUserDeclaredDestructor()) 9216 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9217 9218 // Add any implicitly-declared members to this class. 9219 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9220 9221 // If we have virtual base classes, we may end up finding multiple 9222 // final overriders for a given virtual function. Check for this 9223 // problem now. 9224 if (CXXRecord->getNumVBases()) { 9225 CXXFinalOverriderMap FinalOverriders; 9226 CXXRecord->getFinalOverriders(FinalOverriders); 9227 9228 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9229 MEnd = FinalOverriders.end(); 9230 M != MEnd; ++M) { 9231 for (OverridingMethods::iterator SO = M->second.begin(), 9232 SOEnd = M->second.end(); 9233 SO != SOEnd; ++SO) { 9234 assert(SO->second.size() > 0 && 9235 "Virtual function without overridding functions?"); 9236 if (SO->second.size() == 1) 9237 continue; 9238 9239 // C++ [class.virtual]p2: 9240 // In a derived class, if a virtual member function of a base 9241 // class subobject has more than one final overrider the 9242 // program is ill-formed. 9243 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9244 << (NamedDecl *)M->first << Record; 9245 Diag(M->first->getLocation(), 9246 diag::note_overridden_virtual_function); 9247 for (OverridingMethods::overriding_iterator 9248 OM = SO->second.begin(), 9249 OMEnd = SO->second.end(); 9250 OM != OMEnd; ++OM) 9251 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9252 << (NamedDecl *)M->first << OM->Method->getParent(); 9253 9254 Record->setInvalidDecl(); 9255 } 9256 } 9257 CXXRecord->completeDefinition(&FinalOverriders); 9258 Completed = true; 9259 } 9260 } 9261 } 9262 } 9263 9264 if (!Completed) 9265 Record->completeDefinition(); 9266 9267 // Now that the record is complete, do any delayed exception spec checks 9268 // we were missing. 9269 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9270 const CXXDestructorDecl *Dtor = 9271 DelayedDestructorExceptionSpecChecks.back().first; 9272 if (Dtor->getParent() != Record) 9273 break; 9274 9275 assert(!Dtor->getParent()->isDependentType() && 9276 "Should not ever add destructors of templates into the list."); 9277 CheckOverridingFunctionExceptionSpec(Dtor, 9278 DelayedDestructorExceptionSpecChecks.back().second); 9279 DelayedDestructorExceptionSpecChecks.pop_back(); 9280 } 9281 9282 } else { 9283 ObjCIvarDecl **ClsFields = 9284 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9285 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9286 ID->setLocEnd(RBrac); 9287 // Add ivar's to class's DeclContext. 9288 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9289 ClsFields[i]->setLexicalDeclContext(ID); 9290 ID->addDecl(ClsFields[i]); 9291 } 9292 // Must enforce the rule that ivars in the base classes may not be 9293 // duplicates. 9294 if (ID->getSuperClass()) 9295 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9296 } else if (ObjCImplementationDecl *IMPDecl = 9297 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9298 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9299 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9300 // Ivar declared in @implementation never belongs to the implementation. 9301 // Only it is in implementation's lexical context. 9302 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9303 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9304 } else if (ObjCCategoryDecl *CDecl = 9305 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9306 // case of ivars in class extension; all other cases have been 9307 // reported as errors elsewhere. 9308 // FIXME. Class extension does not have a LocEnd field. 9309 // CDecl->setLocEnd(RBrac); 9310 // Add ivar's to class extension's DeclContext. 9311 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9312 ClsFields[i]->setLexicalDeclContext(CDecl); 9313 CDecl->addDecl(ClsFields[i]); 9314 } 9315 } 9316 } 9317 9318 if (Attr) 9319 ProcessDeclAttributeList(S, Record, Attr); 9320 9321 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9322 // set the visibility of this record. 9323 if (Record && !Record->getDeclContext()->isRecord()) 9324 AddPushedVisibilityAttribute(Record); 9325} 9326 9327/// \brief Determine whether the given integral value is representable within 9328/// the given type T. 9329static bool isRepresentableIntegerValue(ASTContext &Context, 9330 llvm::APSInt &Value, 9331 QualType T) { 9332 assert(T->isIntegralType(Context) && "Integral type required!"); 9333 unsigned BitWidth = Context.getIntWidth(T); 9334 9335 if (Value.isUnsigned() || Value.isNonNegative()) { 9336 if (T->isSignedIntegerOrEnumerationType()) 9337 --BitWidth; 9338 return Value.getActiveBits() <= BitWidth; 9339 } 9340 return Value.getMinSignedBits() <= BitWidth; 9341} 9342 9343// \brief Given an integral type, return the next larger integral type 9344// (or a NULL type of no such type exists). 9345static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9346 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9347 // enum checking below. 9348 assert(T->isIntegralType(Context) && "Integral type required!"); 9349 const unsigned NumTypes = 4; 9350 QualType SignedIntegralTypes[NumTypes] = { 9351 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9352 }; 9353 QualType UnsignedIntegralTypes[NumTypes] = { 9354 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9355 Context.UnsignedLongLongTy 9356 }; 9357 9358 unsigned BitWidth = Context.getTypeSize(T); 9359 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9360 : UnsignedIntegralTypes; 9361 for (unsigned I = 0; I != NumTypes; ++I) 9362 if (Context.getTypeSize(Types[I]) > BitWidth) 9363 return Types[I]; 9364 9365 return QualType(); 9366} 9367 9368EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9369 EnumConstantDecl *LastEnumConst, 9370 SourceLocation IdLoc, 9371 IdentifierInfo *Id, 9372 Expr *Val) { 9373 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9374 llvm::APSInt EnumVal(IntWidth); 9375 QualType EltTy; 9376 9377 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9378 Val = 0; 9379 9380 if (Val) { 9381 if (Enum->isDependentType() || Val->isTypeDependent()) 9382 EltTy = Context.DependentTy; 9383 else { 9384 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9385 SourceLocation ExpLoc; 9386 if (!Val->isValueDependent() && 9387 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9388 Val = 0; 9389 } else { 9390 if (!getLangOptions().CPlusPlus) { 9391 // C99 6.7.2.2p2: 9392 // The expression that defines the value of an enumeration constant 9393 // shall be an integer constant expression that has a value 9394 // representable as an int. 9395 9396 // Complain if the value is not representable in an int. 9397 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9398 Diag(IdLoc, diag::ext_enum_value_not_int) 9399 << EnumVal.toString(10) << Val->getSourceRange() 9400 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9401 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9402 // Force the type of the expression to 'int'. 9403 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9404 } 9405 } 9406 9407 if (Enum->isFixed()) { 9408 EltTy = Enum->getIntegerType(); 9409 9410 // C++0x [dcl.enum]p5: 9411 // ... if the initializing value of an enumerator cannot be 9412 // represented by the underlying type, the program is ill-formed. 9413 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9414 if (getLangOptions().MicrosoftExt) { 9415 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9416 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9417 } else 9418 Diag(IdLoc, diag::err_enumerator_too_large) 9419 << EltTy; 9420 } else 9421 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9422 } 9423 else { 9424 // C++0x [dcl.enum]p5: 9425 // If the underlying type is not fixed, the type of each enumerator 9426 // is the type of its initializing value: 9427 // - If an initializer is specified for an enumerator, the 9428 // initializing value has the same type as the expression. 9429 EltTy = Val->getType(); 9430 } 9431 } 9432 } 9433 } 9434 9435 if (!Val) { 9436 if (Enum->isDependentType()) 9437 EltTy = Context.DependentTy; 9438 else if (!LastEnumConst) { 9439 // C++0x [dcl.enum]p5: 9440 // If the underlying type is not fixed, the type of each enumerator 9441 // is the type of its initializing value: 9442 // - If no initializer is specified for the first enumerator, the 9443 // initializing value has an unspecified integral type. 9444 // 9445 // GCC uses 'int' for its unspecified integral type, as does 9446 // C99 6.7.2.2p3. 9447 if (Enum->isFixed()) { 9448 EltTy = Enum->getIntegerType(); 9449 } 9450 else { 9451 EltTy = Context.IntTy; 9452 } 9453 } else { 9454 // Assign the last value + 1. 9455 EnumVal = LastEnumConst->getInitVal(); 9456 ++EnumVal; 9457 EltTy = LastEnumConst->getType(); 9458 9459 // Check for overflow on increment. 9460 if (EnumVal < LastEnumConst->getInitVal()) { 9461 // C++0x [dcl.enum]p5: 9462 // If the underlying type is not fixed, the type of each enumerator 9463 // is the type of its initializing value: 9464 // 9465 // - Otherwise the type of the initializing value is the same as 9466 // the type of the initializing value of the preceding enumerator 9467 // unless the incremented value is not representable in that type, 9468 // in which case the type is an unspecified integral type 9469 // sufficient to contain the incremented value. If no such type 9470 // exists, the program is ill-formed. 9471 QualType T = getNextLargerIntegralType(Context, EltTy); 9472 if (T.isNull() || Enum->isFixed()) { 9473 // There is no integral type larger enough to represent this 9474 // value. Complain, then allow the value to wrap around. 9475 EnumVal = LastEnumConst->getInitVal(); 9476 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9477 ++EnumVal; 9478 if (Enum->isFixed()) 9479 // When the underlying type is fixed, this is ill-formed. 9480 Diag(IdLoc, diag::err_enumerator_wrapped) 9481 << EnumVal.toString(10) 9482 << EltTy; 9483 else 9484 Diag(IdLoc, diag::warn_enumerator_too_large) 9485 << EnumVal.toString(10); 9486 } else { 9487 EltTy = T; 9488 } 9489 9490 // Retrieve the last enumerator's value, extent that type to the 9491 // type that is supposed to be large enough to represent the incremented 9492 // value, then increment. 9493 EnumVal = LastEnumConst->getInitVal(); 9494 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9495 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9496 ++EnumVal; 9497 9498 // If we're not in C++, diagnose the overflow of enumerator values, 9499 // which in C99 means that the enumerator value is not representable in 9500 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9501 // permits enumerator values that are representable in some larger 9502 // integral type. 9503 if (!getLangOptions().CPlusPlus && !T.isNull()) 9504 Diag(IdLoc, diag::warn_enum_value_overflow); 9505 } else if (!getLangOptions().CPlusPlus && 9506 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9507 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9508 Diag(IdLoc, diag::ext_enum_value_not_int) 9509 << EnumVal.toString(10) << 1; 9510 } 9511 } 9512 } 9513 9514 if (!EltTy->isDependentType()) { 9515 // Make the enumerator value match the signedness and size of the 9516 // enumerator's type. 9517 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9518 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9519 } 9520 9521 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9522 Val, EnumVal); 9523} 9524 9525 9526Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9527 SourceLocation IdLoc, IdentifierInfo *Id, 9528 AttributeList *Attr, 9529 SourceLocation EqualLoc, Expr *val) { 9530 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9531 EnumConstantDecl *LastEnumConst = 9532 cast_or_null<EnumConstantDecl>(lastEnumConst); 9533 Expr *Val = static_cast<Expr*>(val); 9534 9535 // The scope passed in may not be a decl scope. Zip up the scope tree until 9536 // we find one that is. 9537 S = getNonFieldDeclScope(S); 9538 9539 // Verify that there isn't already something declared with this name in this 9540 // scope. 9541 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9542 ForRedeclaration); 9543 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9544 // Maybe we will complain about the shadowed template parameter. 9545 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9546 // Just pretend that we didn't see the previous declaration. 9547 PrevDecl = 0; 9548 } 9549 9550 if (PrevDecl) { 9551 // When in C++, we may get a TagDecl with the same name; in this case the 9552 // enum constant will 'hide' the tag. 9553 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9554 "Received TagDecl when not in C++!"); 9555 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9556 if (isa<EnumConstantDecl>(PrevDecl)) 9557 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9558 else 9559 Diag(IdLoc, diag::err_redefinition) << Id; 9560 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9561 return 0; 9562 } 9563 } 9564 9565 // C++ [class.mem]p13: 9566 // If T is the name of a class, then each of the following shall have a 9567 // name different from T: 9568 // - every enumerator of every member of class T that is an enumerated 9569 // type 9570 if (CXXRecordDecl *Record 9571 = dyn_cast<CXXRecordDecl>( 9572 TheEnumDecl->getDeclContext()->getRedeclContext())) 9573 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9574 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9575 9576 EnumConstantDecl *New = 9577 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9578 9579 if (New) { 9580 // Process attributes. 9581 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9582 9583 // Register this decl in the current scope stack. 9584 New->setAccess(TheEnumDecl->getAccess()); 9585 PushOnScopeChains(New, S); 9586 } 9587 9588 return New; 9589} 9590 9591void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9592 SourceLocation RBraceLoc, Decl *EnumDeclX, 9593 Decl **Elements, unsigned NumElements, 9594 Scope *S, AttributeList *Attr) { 9595 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9596 QualType EnumType = Context.getTypeDeclType(Enum); 9597 9598 if (Attr) 9599 ProcessDeclAttributeList(S, Enum, Attr); 9600 9601 if (Enum->isDependentType()) { 9602 for (unsigned i = 0; i != NumElements; ++i) { 9603 EnumConstantDecl *ECD = 9604 cast_or_null<EnumConstantDecl>(Elements[i]); 9605 if (!ECD) continue; 9606 9607 ECD->setType(EnumType); 9608 } 9609 9610 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9611 return; 9612 } 9613 9614 // TODO: If the result value doesn't fit in an int, it must be a long or long 9615 // long value. ISO C does not support this, but GCC does as an extension, 9616 // emit a warning. 9617 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9618 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9619 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9620 9621 // Verify that all the values are okay, compute the size of the values, and 9622 // reverse the list. 9623 unsigned NumNegativeBits = 0; 9624 unsigned NumPositiveBits = 0; 9625 9626 // Keep track of whether all elements have type int. 9627 bool AllElementsInt = true; 9628 9629 for (unsigned i = 0; i != NumElements; ++i) { 9630 EnumConstantDecl *ECD = 9631 cast_or_null<EnumConstantDecl>(Elements[i]); 9632 if (!ECD) continue; // Already issued a diagnostic. 9633 9634 const llvm::APSInt &InitVal = ECD->getInitVal(); 9635 9636 // Keep track of the size of positive and negative values. 9637 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9638 NumPositiveBits = std::max(NumPositiveBits, 9639 (unsigned)InitVal.getActiveBits()); 9640 else 9641 NumNegativeBits = std::max(NumNegativeBits, 9642 (unsigned)InitVal.getMinSignedBits()); 9643 9644 // Keep track of whether every enum element has type int (very commmon). 9645 if (AllElementsInt) 9646 AllElementsInt = ECD->getType() == Context.IntTy; 9647 } 9648 9649 // Figure out the type that should be used for this enum. 9650 QualType BestType; 9651 unsigned BestWidth; 9652 9653 // C++0x N3000 [conv.prom]p3: 9654 // An rvalue of an unscoped enumeration type whose underlying 9655 // type is not fixed can be converted to an rvalue of the first 9656 // of the following types that can represent all the values of 9657 // the enumeration: int, unsigned int, long int, unsigned long 9658 // int, long long int, or unsigned long long int. 9659 // C99 6.4.4.3p2: 9660 // An identifier declared as an enumeration constant has type int. 9661 // The C99 rule is modified by a gcc extension 9662 QualType BestPromotionType; 9663 9664 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9665 // -fshort-enums is the equivalent to specifying the packed attribute on all 9666 // enum definitions. 9667 if (LangOpts.ShortEnums) 9668 Packed = true; 9669 9670 if (Enum->isFixed()) { 9671 BestType = BestPromotionType = Enum->getIntegerType(); 9672 // We don't need to set BestWidth, because BestType is going to be the type 9673 // of the enumerators, but we do anyway because otherwise some compilers 9674 // warn that it might be used uninitialized. 9675 BestWidth = CharWidth; 9676 } 9677 else if (NumNegativeBits) { 9678 // If there is a negative value, figure out the smallest integer type (of 9679 // int/long/longlong) that fits. 9680 // If it's packed, check also if it fits a char or a short. 9681 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9682 BestType = Context.SignedCharTy; 9683 BestWidth = CharWidth; 9684 } else if (Packed && NumNegativeBits <= ShortWidth && 9685 NumPositiveBits < ShortWidth) { 9686 BestType = Context.ShortTy; 9687 BestWidth = ShortWidth; 9688 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9689 BestType = Context.IntTy; 9690 BestWidth = IntWidth; 9691 } else { 9692 BestWidth = Context.getTargetInfo().getLongWidth(); 9693 9694 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9695 BestType = Context.LongTy; 9696 } else { 9697 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9698 9699 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9700 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9701 BestType = Context.LongLongTy; 9702 } 9703 } 9704 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9705 } else { 9706 // If there is no negative value, figure out the smallest type that fits 9707 // all of the enumerator values. 9708 // If it's packed, check also if it fits a char or a short. 9709 if (Packed && NumPositiveBits <= CharWidth) { 9710 BestType = Context.UnsignedCharTy; 9711 BestPromotionType = Context.IntTy; 9712 BestWidth = CharWidth; 9713 } else if (Packed && NumPositiveBits <= ShortWidth) { 9714 BestType = Context.UnsignedShortTy; 9715 BestPromotionType = Context.IntTy; 9716 BestWidth = ShortWidth; 9717 } else if (NumPositiveBits <= IntWidth) { 9718 BestType = Context.UnsignedIntTy; 9719 BestWidth = IntWidth; 9720 BestPromotionType 9721 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9722 ? Context.UnsignedIntTy : Context.IntTy; 9723 } else if (NumPositiveBits <= 9724 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9725 BestType = Context.UnsignedLongTy; 9726 BestPromotionType 9727 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9728 ? Context.UnsignedLongTy : Context.LongTy; 9729 } else { 9730 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9731 assert(NumPositiveBits <= BestWidth && 9732 "How could an initializer get larger than ULL?"); 9733 BestType = Context.UnsignedLongLongTy; 9734 BestPromotionType 9735 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9736 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9737 } 9738 } 9739 9740 // Loop over all of the enumerator constants, changing their types to match 9741 // the type of the enum if needed. 9742 for (unsigned i = 0; i != NumElements; ++i) { 9743 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9744 if (!ECD) continue; // Already issued a diagnostic. 9745 9746 // Standard C says the enumerators have int type, but we allow, as an 9747 // extension, the enumerators to be larger than int size. If each 9748 // enumerator value fits in an int, type it as an int, otherwise type it the 9749 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9750 // that X has type 'int', not 'unsigned'. 9751 9752 // Determine whether the value fits into an int. 9753 llvm::APSInt InitVal = ECD->getInitVal(); 9754 9755 // If it fits into an integer type, force it. Otherwise force it to match 9756 // the enum decl type. 9757 QualType NewTy; 9758 unsigned NewWidth; 9759 bool NewSign; 9760 if (!getLangOptions().CPlusPlus && 9761 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9762 NewTy = Context.IntTy; 9763 NewWidth = IntWidth; 9764 NewSign = true; 9765 } else if (ECD->getType() == BestType) { 9766 // Already the right type! 9767 if (getLangOptions().CPlusPlus) 9768 // C++ [dcl.enum]p4: Following the closing brace of an 9769 // enum-specifier, each enumerator has the type of its 9770 // enumeration. 9771 ECD->setType(EnumType); 9772 continue; 9773 } else { 9774 NewTy = BestType; 9775 NewWidth = BestWidth; 9776 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9777 } 9778 9779 // Adjust the APSInt value. 9780 InitVal = InitVal.extOrTrunc(NewWidth); 9781 InitVal.setIsSigned(NewSign); 9782 ECD->setInitVal(InitVal); 9783 9784 // Adjust the Expr initializer and type. 9785 if (ECD->getInitExpr() && 9786 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9787 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9788 CK_IntegralCast, 9789 ECD->getInitExpr(), 9790 /*base paths*/ 0, 9791 VK_RValue)); 9792 if (getLangOptions().CPlusPlus) 9793 // C++ [dcl.enum]p4: Following the closing brace of an 9794 // enum-specifier, each enumerator has the type of its 9795 // enumeration. 9796 ECD->setType(EnumType); 9797 else 9798 ECD->setType(NewTy); 9799 } 9800 9801 Enum->completeDefinition(BestType, BestPromotionType, 9802 NumPositiveBits, NumNegativeBits); 9803} 9804 9805Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9806 SourceLocation StartLoc, 9807 SourceLocation EndLoc) { 9808 StringLiteral *AsmString = cast<StringLiteral>(expr); 9809 9810 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9811 AsmString, StartLoc, 9812 EndLoc); 9813 CurContext->addDecl(New); 9814 return New; 9815} 9816 9817DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9818 IdentifierInfo &ModuleName, 9819 SourceLocation ModuleNameLoc) { 9820 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9821 ModuleName, ModuleNameLoc); 9822 if (!Module) 9823 return true; 9824 9825 // FIXME: Actually create a declaration to describe the module import. 9826 (void)Module; 9827 return DeclResult((Decl *)0); 9828} 9829 9830void 9831Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9832 SourceLocation ModulePrivateKeyword) { 9833 assert(!Old->isModulePrivate() && "Old is module-private!"); 9834 9835 Diag(New->getLocation(), diag::err_module_private_follows_public) 9836 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9837 Diag(Old->getLocation(), diag::note_previous_declaration) 9838 << Old->getDeclName(); 9839 9840 // Drop the __module_private__ from the new declaration, since it's invalid. 9841 New->setModulePrivate(false); 9842} 9843 9844void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9845 SourceLocation PragmaLoc, 9846 SourceLocation NameLoc) { 9847 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9848 9849 if (PrevDecl) { 9850 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9851 } else { 9852 (void)WeakUndeclaredIdentifiers.insert( 9853 std::pair<IdentifierInfo*,WeakInfo> 9854 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9855 } 9856} 9857 9858void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9859 IdentifierInfo* AliasName, 9860 SourceLocation PragmaLoc, 9861 SourceLocation NameLoc, 9862 SourceLocation AliasNameLoc) { 9863 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9864 LookupOrdinaryName); 9865 WeakInfo W = WeakInfo(Name, NameLoc); 9866 9867 if (PrevDecl) { 9868 if (!PrevDecl->hasAttr<AliasAttr>()) 9869 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9870 DeclApplyPragmaWeak(TUScope, ND, W); 9871 } else { 9872 (void)WeakUndeclaredIdentifiers.insert( 9873 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9874 } 9875} 9876 9877Decl *Sema::getObjCDeclContext() const { 9878 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9879} 9880 9881AvailabilityResult Sema::getCurContextAvailability() const { 9882 const Decl *D = cast<Decl>(getCurLexicalContext()); 9883 // A category implicitly has the availability of the interface. 9884 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 9885 D = CatD->getClassInterface(); 9886 9887 return D->getAvailability(); 9888} 9889