SemaDecl.cpp revision 16e46dd0c284296cea819dfbf67942ecef02894d
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/EvaluatedExprVisitor.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Sema/DelayedDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58namespace { 59 60class TypeNameValidatorCCC : public CorrectionCandidateCallback { 61 public: 62 TypeNameValidatorCCC(bool AllowInvalid) : AllowInvalidDecl(AllowInvalid) { 63 WantExpressionKeywords = false; 64 WantCXXNamedCasts = false; 65 WantRemainingKeywords = false; 66 } 67 68 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 69 if (NamedDecl *ND = candidate.getCorrectionDecl()) 70 return (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND)) && 71 (AllowInvalidDecl || !ND->isInvalidDecl()); 72 else 73 return candidate.isKeyword(); 74 } 75 76 private: 77 bool AllowInvalidDecl; 78}; 79 80} 81 82/// \brief If the identifier refers to a type name within this scope, 83/// return the declaration of that type. 84/// 85/// This routine performs ordinary name lookup of the identifier II 86/// within the given scope, with optional C++ scope specifier SS, to 87/// determine whether the name refers to a type. If so, returns an 88/// opaque pointer (actually a QualType) corresponding to that 89/// type. Otherwise, returns NULL. 90/// 91/// If name lookup results in an ambiguity, this routine will complain 92/// and then return NULL. 93ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 94 Scope *S, CXXScopeSpec *SS, 95 bool isClassName, bool HasTrailingDot, 96 ParsedType ObjectTypePtr, 97 bool IsCtorOrDtorName, 98 bool WantNontrivialTypeSourceInfo, 99 IdentifierInfo **CorrectedII) { 100 // Determine where we will perform name lookup. 101 DeclContext *LookupCtx = 0; 102 if (ObjectTypePtr) { 103 QualType ObjectType = ObjectTypePtr.get(); 104 if (ObjectType->isRecordType()) 105 LookupCtx = computeDeclContext(ObjectType); 106 } else if (SS && SS->isNotEmpty()) { 107 LookupCtx = computeDeclContext(*SS, false); 108 109 if (!LookupCtx) { 110 if (isDependentScopeSpecifier(*SS)) { 111 // C++ [temp.res]p3: 112 // A qualified-id that refers to a type and in which the 113 // nested-name-specifier depends on a template-parameter (14.6.2) 114 // shall be prefixed by the keyword typename to indicate that the 115 // qualified-id denotes a type, forming an 116 // elaborated-type-specifier (7.1.5.3). 117 // 118 // We therefore do not perform any name lookup if the result would 119 // refer to a member of an unknown specialization. 120 if (!isClassName) 121 return ParsedType(); 122 123 // We know from the grammar that this name refers to a type, 124 // so build a dependent node to describe the type. 125 if (WantNontrivialTypeSourceInfo) 126 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 127 128 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 129 QualType T = 130 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 131 II, NameLoc); 132 133 return ParsedType::make(T); 134 } 135 136 return ParsedType(); 137 } 138 139 if (!LookupCtx->isDependentContext() && 140 RequireCompleteDeclContext(*SS, LookupCtx)) 141 return ParsedType(); 142 } 143 144 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 145 // lookup for class-names. 146 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 147 LookupOrdinaryName; 148 LookupResult Result(*this, &II, NameLoc, Kind); 149 if (LookupCtx) { 150 // Perform "qualified" name lookup into the declaration context we 151 // computed, which is either the type of the base of a member access 152 // expression or the declaration context associated with a prior 153 // nested-name-specifier. 154 LookupQualifiedName(Result, LookupCtx); 155 156 if (ObjectTypePtr && Result.empty()) { 157 // C++ [basic.lookup.classref]p3: 158 // If the unqualified-id is ~type-name, the type-name is looked up 159 // in the context of the entire postfix-expression. If the type T of 160 // the object expression is of a class type C, the type-name is also 161 // looked up in the scope of class C. At least one of the lookups shall 162 // find a name that refers to (possibly cv-qualified) T. 163 LookupName(Result, S); 164 } 165 } else { 166 // Perform unqualified name lookup. 167 LookupName(Result, S); 168 } 169 170 NamedDecl *IIDecl = 0; 171 switch (Result.getResultKind()) { 172 case LookupResult::NotFound: 173 case LookupResult::NotFoundInCurrentInstantiation: 174 if (CorrectedII) { 175 TypeNameValidatorCCC Validator(true); 176 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 177 Kind, S, SS, Validator); 178 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 179 TemplateTy Template; 180 bool MemberOfUnknownSpecialization; 181 UnqualifiedId TemplateName; 182 TemplateName.setIdentifier(NewII, NameLoc); 183 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 184 CXXScopeSpec NewSS, *NewSSPtr = SS; 185 if (SS && NNS) { 186 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 187 NewSSPtr = &NewSS; 188 } 189 if (Correction && (NNS || NewII != &II) && 190 // Ignore a correction to a template type as the to-be-corrected 191 // identifier is not a template (typo correction for template names 192 // is handled elsewhere). 193 !(getLangOptions().CPlusPlus && NewSSPtr && 194 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 195 false, Template, MemberOfUnknownSpecialization))) { 196 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 197 isClassName, HasTrailingDot, ObjectTypePtr, 198 IsCtorOrDtorName, 199 WantNontrivialTypeSourceInfo); 200 if (Ty) { 201 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 202 std::string CorrectedQuotedStr( 203 Correction.getQuoted(getLangOptions())); 204 Diag(NameLoc, diag::err_unknown_typename_suggest) 205 << Result.getLookupName() << CorrectedQuotedStr 206 << FixItHint::CreateReplacement(SourceRange(NameLoc), 207 CorrectedStr); 208 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 209 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 210 << CorrectedQuotedStr; 211 212 if (SS && NNS) 213 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 214 *CorrectedII = NewII; 215 return Ty; 216 } 217 } 218 } 219 // If typo correction failed or was not performed, fall through 220 case LookupResult::FoundOverloaded: 221 case LookupResult::FoundUnresolvedValue: 222 Result.suppressDiagnostics(); 223 return ParsedType(); 224 225 case LookupResult::Ambiguous: 226 // Recover from type-hiding ambiguities by hiding the type. We'll 227 // do the lookup again when looking for an object, and we can 228 // diagnose the error then. If we don't do this, then the error 229 // about hiding the type will be immediately followed by an error 230 // that only makes sense if the identifier was treated like a type. 231 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 232 Result.suppressDiagnostics(); 233 return ParsedType(); 234 } 235 236 // Look to see if we have a type anywhere in the list of results. 237 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 238 Res != ResEnd; ++Res) { 239 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 240 if (!IIDecl || 241 (*Res)->getLocation().getRawEncoding() < 242 IIDecl->getLocation().getRawEncoding()) 243 IIDecl = *Res; 244 } 245 } 246 247 if (!IIDecl) { 248 // None of the entities we found is a type, so there is no way 249 // to even assume that the result is a type. In this case, don't 250 // complain about the ambiguity. The parser will either try to 251 // perform this lookup again (e.g., as an object name), which 252 // will produce the ambiguity, or will complain that it expected 253 // a type name. 254 Result.suppressDiagnostics(); 255 return ParsedType(); 256 } 257 258 // We found a type within the ambiguous lookup; diagnose the 259 // ambiguity and then return that type. This might be the right 260 // answer, or it might not be, but it suppresses any attempt to 261 // perform the name lookup again. 262 break; 263 264 case LookupResult::Found: 265 IIDecl = Result.getFoundDecl(); 266 break; 267 } 268 269 assert(IIDecl && "Didn't find decl"); 270 271 QualType T; 272 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 273 DiagnoseUseOfDecl(IIDecl, NameLoc); 274 275 if (T.isNull()) 276 T = Context.getTypeDeclType(TD); 277 278 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a 279 // constructor or destructor name (in such a case, the scope specifier 280 // will be attached to the enclosing Expr or Decl node). 281 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) { 282 if (WantNontrivialTypeSourceInfo) { 283 // Construct a type with type-source information. 284 TypeLocBuilder Builder; 285 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 286 287 T = getElaboratedType(ETK_None, *SS, T); 288 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 289 ElabTL.setKeywordLoc(SourceLocation()); 290 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 291 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 292 } else { 293 T = getElaboratedType(ETK_None, *SS, T); 294 } 295 } 296 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 297 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 298 if (!HasTrailingDot) 299 T = Context.getObjCInterfaceType(IDecl); 300 } 301 302 if (T.isNull()) { 303 // If it's not plausibly a type, suppress diagnostics. 304 Result.suppressDiagnostics(); 305 return ParsedType(); 306 } 307 return ParsedType::make(T); 308} 309 310/// isTagName() - This method is called *for error recovery purposes only* 311/// to determine if the specified name is a valid tag name ("struct foo"). If 312/// so, this returns the TST for the tag corresponding to it (TST_enum, 313/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 314/// where the user forgot to specify the tag. 315DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 316 // Do a tag name lookup in this scope. 317 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 318 LookupName(R, S, false); 319 R.suppressDiagnostics(); 320 if (R.getResultKind() == LookupResult::Found) 321 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 322 switch (TD->getTagKind()) { 323 case TTK_Struct: return DeclSpec::TST_struct; 324 case TTK_Union: return DeclSpec::TST_union; 325 case TTK_Class: return DeclSpec::TST_class; 326 case TTK_Enum: return DeclSpec::TST_enum; 327 } 328 } 329 330 return DeclSpec::TST_unspecified; 331} 332 333/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 334/// if a CXXScopeSpec's type is equal to the type of one of the base classes 335/// then downgrade the missing typename error to a warning. 336/// This is needed for MSVC compatibility; Example: 337/// @code 338/// template<class T> class A { 339/// public: 340/// typedef int TYPE; 341/// }; 342/// template<class T> class B : public A<T> { 343/// public: 344/// A<T>::TYPE a; // no typename required because A<T> is a base class. 345/// }; 346/// @endcode 347bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 348 if (CurContext->isRecord()) { 349 const Type *Ty = SS->getScopeRep()->getAsType(); 350 351 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 352 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 353 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 354 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 355 return true; 356 return S->isFunctionPrototypeScope(); 357 } 358 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 359} 360 361bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 362 SourceLocation IILoc, 363 Scope *S, 364 CXXScopeSpec *SS, 365 ParsedType &SuggestedType) { 366 // We don't have anything to suggest (yet). 367 SuggestedType = ParsedType(); 368 369 // There may have been a typo in the name of the type. Look up typo 370 // results, in case we have something that we can suggest. 371 TypeNameValidatorCCC Validator(false); 372 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 373 LookupOrdinaryName, S, SS, 374 Validator)) { 375 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 376 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 377 378 if (Corrected.isKeyword()) { 379 // We corrected to a keyword. 380 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 381 Diag(IILoc, diag::err_unknown_typename_suggest) 382 << &II << CorrectedQuotedStr; 383 } else { 384 NamedDecl *Result = Corrected.getCorrectionDecl(); 385 // We found a similarly-named type or interface; suggest that. 386 if (!SS || !SS->isSet()) 387 Diag(IILoc, diag::err_unknown_typename_suggest) 388 << &II << CorrectedQuotedStr 389 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 390 else if (DeclContext *DC = computeDeclContext(*SS, false)) 391 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 392 << &II << DC << CorrectedQuotedStr << SS->getRange() 393 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 394 else 395 llvm_unreachable("could not have corrected a typo here"); 396 397 Diag(Result->getLocation(), diag::note_previous_decl) 398 << CorrectedQuotedStr; 399 400 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 401 false, false, ParsedType(), 402 /*IsCtorOrDtorName=*/false, 403 /*NonTrivialTypeSourceInfo=*/true); 404 } 405 return true; 406 } 407 408 if (getLangOptions().CPlusPlus) { 409 // See if II is a class template that the user forgot to pass arguments to. 410 UnqualifiedId Name; 411 Name.setIdentifier(&II, IILoc); 412 CXXScopeSpec EmptySS; 413 TemplateTy TemplateResult; 414 bool MemberOfUnknownSpecialization; 415 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 416 Name, ParsedType(), true, TemplateResult, 417 MemberOfUnknownSpecialization) == TNK_Type_template) { 418 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 419 Diag(IILoc, diag::err_template_missing_args) << TplName; 420 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 421 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 422 << TplDecl->getTemplateParameters()->getSourceRange(); 423 } 424 return true; 425 } 426 } 427 428 // FIXME: Should we move the logic that tries to recover from a missing tag 429 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 430 431 if (!SS || (!SS->isSet() && !SS->isInvalid())) 432 Diag(IILoc, diag::err_unknown_typename) << &II; 433 else if (DeclContext *DC = computeDeclContext(*SS, false)) 434 Diag(IILoc, diag::err_typename_nested_not_found) 435 << &II << DC << SS->getRange(); 436 else if (isDependentScopeSpecifier(*SS)) { 437 unsigned DiagID = diag::err_typename_missing; 438 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S)) 439 DiagID = diag::warn_typename_missing; 440 441 Diag(SS->getRange().getBegin(), DiagID) 442 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 443 << SourceRange(SS->getRange().getBegin(), IILoc) 444 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 445 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc) 446 .get(); 447 } else { 448 assert(SS && SS->isInvalid() && 449 "Invalid scope specifier has already been diagnosed"); 450 } 451 452 return true; 453} 454 455/// \brief Determine whether the given result set contains either a type name 456/// or 457static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 458 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 459 NextToken.is(tok::less); 460 461 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 462 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 463 return true; 464 465 if (CheckTemplate && isa<TemplateDecl>(*I)) 466 return true; 467 } 468 469 return false; 470} 471 472Sema::NameClassification Sema::ClassifyName(Scope *S, 473 CXXScopeSpec &SS, 474 IdentifierInfo *&Name, 475 SourceLocation NameLoc, 476 const Token &NextToken) { 477 DeclarationNameInfo NameInfo(Name, NameLoc); 478 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 479 480 if (NextToken.is(tok::coloncolon)) { 481 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 482 QualType(), false, SS, 0, false); 483 484 } 485 486 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 487 LookupParsedName(Result, S, &SS, !CurMethod); 488 489 // Perform lookup for Objective-C instance variables (including automatically 490 // synthesized instance variables), if we're in an Objective-C method. 491 // FIXME: This lookup really, really needs to be folded in to the normal 492 // unqualified lookup mechanism. 493 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 494 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 495 if (E.get() || E.isInvalid()) 496 return E; 497 } 498 499 bool SecondTry = false; 500 bool IsFilteredTemplateName = false; 501 502Corrected: 503 switch (Result.getResultKind()) { 504 case LookupResult::NotFound: 505 // If an unqualified-id is followed by a '(', then we have a function 506 // call. 507 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 508 // In C++, this is an ADL-only call. 509 // FIXME: Reference? 510 if (getLangOptions().CPlusPlus) 511 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 512 513 // C90 6.3.2.2: 514 // If the expression that precedes the parenthesized argument list in a 515 // function call consists solely of an identifier, and if no 516 // declaration is visible for this identifier, the identifier is 517 // implicitly declared exactly as if, in the innermost block containing 518 // the function call, the declaration 519 // 520 // extern int identifier (); 521 // 522 // appeared. 523 // 524 // We also allow this in C99 as an extension. 525 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 526 Result.addDecl(D); 527 Result.resolveKind(); 528 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 529 } 530 } 531 532 // In C, we first see whether there is a tag type by the same name, in 533 // which case it's likely that the user just forget to write "enum", 534 // "struct", or "union". 535 if (!getLangOptions().CPlusPlus && !SecondTry) { 536 Result.clear(LookupTagName); 537 LookupParsedName(Result, S, &SS); 538 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 539 const char *TagName = 0; 540 const char *FixItTagName = 0; 541 switch (Tag->getTagKind()) { 542 case TTK_Class: 543 TagName = "class"; 544 FixItTagName = "class "; 545 break; 546 547 case TTK_Enum: 548 TagName = "enum"; 549 FixItTagName = "enum "; 550 break; 551 552 case TTK_Struct: 553 TagName = "struct"; 554 FixItTagName = "struct "; 555 break; 556 557 case TTK_Union: 558 TagName = "union"; 559 FixItTagName = "union "; 560 break; 561 } 562 563 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 564 << Name << TagName << getLangOptions().CPlusPlus 565 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 566 break; 567 } 568 569 Result.clear(LookupOrdinaryName); 570 } 571 572 // Perform typo correction to determine if there is another name that is 573 // close to this name. 574 if (!SecondTry) { 575 SecondTry = true; 576 CorrectionCandidateCallback DefaultValidator; 577 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 578 Result.getLookupKind(), S, 579 &SS, DefaultValidator)) { 580 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 581 unsigned QualifiedDiag = diag::err_no_member_suggest; 582 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 583 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 584 585 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 586 NamedDecl *UnderlyingFirstDecl 587 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 588 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 589 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 590 UnqualifiedDiag = diag::err_no_template_suggest; 591 QualifiedDiag = diag::err_no_member_template_suggest; 592 } else if (UnderlyingFirstDecl && 593 (isa<TypeDecl>(UnderlyingFirstDecl) || 594 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 595 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 596 UnqualifiedDiag = diag::err_unknown_typename_suggest; 597 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 598 } 599 600 if (SS.isEmpty()) 601 Diag(NameLoc, UnqualifiedDiag) 602 << Name << CorrectedQuotedStr 603 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 604 else 605 Diag(NameLoc, QualifiedDiag) 606 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 607 << SS.getRange() 608 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 609 610 // Update the name, so that the caller has the new name. 611 Name = Corrected.getCorrectionAsIdentifierInfo(); 612 613 // Typo correction corrected to a keyword. 614 if (Corrected.isKeyword()) 615 return Corrected.getCorrectionAsIdentifierInfo(); 616 617 // Also update the LookupResult... 618 // FIXME: This should probably go away at some point 619 Result.clear(); 620 Result.setLookupName(Corrected.getCorrection()); 621 if (FirstDecl) { 622 Result.addDecl(FirstDecl); 623 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 624 << CorrectedQuotedStr; 625 } 626 627 // If we found an Objective-C instance variable, let 628 // LookupInObjCMethod build the appropriate expression to 629 // reference the ivar. 630 // FIXME: This is a gross hack. 631 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 632 Result.clear(); 633 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 634 return move(E); 635 } 636 637 goto Corrected; 638 } 639 } 640 641 // We failed to correct; just fall through and let the parser deal with it. 642 Result.suppressDiagnostics(); 643 return NameClassification::Unknown(); 644 645 case LookupResult::NotFoundInCurrentInstantiation: { 646 // We performed name lookup into the current instantiation, and there were 647 // dependent bases, so we treat this result the same way as any other 648 // dependent nested-name-specifier. 649 650 // C++ [temp.res]p2: 651 // A name used in a template declaration or definition and that is 652 // dependent on a template-parameter is assumed not to name a type 653 // unless the applicable name lookup finds a type name or the name is 654 // qualified by the keyword typename. 655 // 656 // FIXME: If the next token is '<', we might want to ask the parser to 657 // perform some heroics to see if we actually have a 658 // template-argument-list, which would indicate a missing 'template' 659 // keyword here. 660 return BuildDependentDeclRefExpr(SS, /*TemplateKWLoc=*/SourceLocation(), 661 NameInfo, /*TemplateArgs=*/0); 662 } 663 664 case LookupResult::Found: 665 case LookupResult::FoundOverloaded: 666 case LookupResult::FoundUnresolvedValue: 667 break; 668 669 case LookupResult::Ambiguous: 670 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 671 hasAnyAcceptableTemplateNames(Result)) { 672 // C++ [temp.local]p3: 673 // A lookup that finds an injected-class-name (10.2) can result in an 674 // ambiguity in certain cases (for example, if it is found in more than 675 // one base class). If all of the injected-class-names that are found 676 // refer to specializations of the same class template, and if the name 677 // is followed by a template-argument-list, the reference refers to the 678 // class template itself and not a specialization thereof, and is not 679 // ambiguous. 680 // 681 // This filtering can make an ambiguous result into an unambiguous one, 682 // so try again after filtering out template names. 683 FilterAcceptableTemplateNames(Result); 684 if (!Result.isAmbiguous()) { 685 IsFilteredTemplateName = true; 686 break; 687 } 688 } 689 690 // Diagnose the ambiguity and return an error. 691 return NameClassification::Error(); 692 } 693 694 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 695 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 696 // C++ [temp.names]p3: 697 // After name lookup (3.4) finds that a name is a template-name or that 698 // an operator-function-id or a literal- operator-id refers to a set of 699 // overloaded functions any member of which is a function template if 700 // this is followed by a <, the < is always taken as the delimiter of a 701 // template-argument-list and never as the less-than operator. 702 if (!IsFilteredTemplateName) 703 FilterAcceptableTemplateNames(Result); 704 705 if (!Result.empty()) { 706 bool IsFunctionTemplate; 707 TemplateName Template; 708 if (Result.end() - Result.begin() > 1) { 709 IsFunctionTemplate = true; 710 Template = Context.getOverloadedTemplateName(Result.begin(), 711 Result.end()); 712 } else { 713 TemplateDecl *TD 714 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 715 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 716 717 if (SS.isSet() && !SS.isInvalid()) 718 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 719 /*TemplateKeyword=*/false, 720 TD); 721 else 722 Template = TemplateName(TD); 723 } 724 725 if (IsFunctionTemplate) { 726 // Function templates always go through overload resolution, at which 727 // point we'll perform the various checks (e.g., accessibility) we need 728 // to based on which function we selected. 729 Result.suppressDiagnostics(); 730 731 return NameClassification::FunctionTemplate(Template); 732 } 733 734 return NameClassification::TypeTemplate(Template); 735 } 736 } 737 738 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 739 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 740 DiagnoseUseOfDecl(Type, NameLoc); 741 QualType T = Context.getTypeDeclType(Type); 742 return ParsedType::make(T); 743 } 744 745 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 746 if (!Class) { 747 // FIXME: It's unfortunate that we don't have a Type node for handling this. 748 if (ObjCCompatibleAliasDecl *Alias 749 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 750 Class = Alias->getClassInterface(); 751 } 752 753 if (Class) { 754 DiagnoseUseOfDecl(Class, NameLoc); 755 756 if (NextToken.is(tok::period)) { 757 // Interface. <something> is parsed as a property reference expression. 758 // Just return "unknown" as a fall-through for now. 759 Result.suppressDiagnostics(); 760 return NameClassification::Unknown(); 761 } 762 763 QualType T = Context.getObjCInterfaceType(Class); 764 return ParsedType::make(T); 765 } 766 767 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 768 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result, 0); 769 770 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 771 return BuildDeclarationNameExpr(SS, Result, ADL); 772} 773 774// Determines the context to return to after temporarily entering a 775// context. This depends in an unnecessarily complicated way on the 776// exact ordering of callbacks from the parser. 777DeclContext *Sema::getContainingDC(DeclContext *DC) { 778 779 // Functions defined inline within classes aren't parsed until we've 780 // finished parsing the top-level class, so the top-level class is 781 // the context we'll need to return to. 782 if (isa<FunctionDecl>(DC)) { 783 DC = DC->getLexicalParent(); 784 785 // A function not defined within a class will always return to its 786 // lexical context. 787 if (!isa<CXXRecordDecl>(DC)) 788 return DC; 789 790 // A C++ inline method/friend is parsed *after* the topmost class 791 // it was declared in is fully parsed ("complete"); the topmost 792 // class is the context we need to return to. 793 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 794 DC = RD; 795 796 // Return the declaration context of the topmost class the inline method is 797 // declared in. 798 return DC; 799 } 800 801 return DC->getLexicalParent(); 802} 803 804void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 805 assert(getContainingDC(DC) == CurContext && 806 "The next DeclContext should be lexically contained in the current one."); 807 CurContext = DC; 808 S->setEntity(DC); 809} 810 811void Sema::PopDeclContext() { 812 assert(CurContext && "DeclContext imbalance!"); 813 814 CurContext = getContainingDC(CurContext); 815 assert(CurContext && "Popped translation unit!"); 816} 817 818/// EnterDeclaratorContext - Used when we must lookup names in the context 819/// of a declarator's nested name specifier. 820/// 821void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 822 // C++0x [basic.lookup.unqual]p13: 823 // A name used in the definition of a static data member of class 824 // X (after the qualified-id of the static member) is looked up as 825 // if the name was used in a member function of X. 826 // C++0x [basic.lookup.unqual]p14: 827 // If a variable member of a namespace is defined outside of the 828 // scope of its namespace then any name used in the definition of 829 // the variable member (after the declarator-id) is looked up as 830 // if the definition of the variable member occurred in its 831 // namespace. 832 // Both of these imply that we should push a scope whose context 833 // is the semantic context of the declaration. We can't use 834 // PushDeclContext here because that context is not necessarily 835 // lexically contained in the current context. Fortunately, 836 // the containing scope should have the appropriate information. 837 838 assert(!S->getEntity() && "scope already has entity"); 839 840#ifndef NDEBUG 841 Scope *Ancestor = S->getParent(); 842 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 843 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 844#endif 845 846 CurContext = DC; 847 S->setEntity(DC); 848} 849 850void Sema::ExitDeclaratorContext(Scope *S) { 851 assert(S->getEntity() == CurContext && "Context imbalance!"); 852 853 // Switch back to the lexical context. The safety of this is 854 // enforced by an assert in EnterDeclaratorContext. 855 Scope *Ancestor = S->getParent(); 856 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 857 CurContext = (DeclContext*) Ancestor->getEntity(); 858 859 // We don't need to do anything with the scope, which is going to 860 // disappear. 861} 862 863 864void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 865 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 866 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 867 // We assume that the caller has already called 868 // ActOnReenterTemplateScope 869 FD = TFD->getTemplatedDecl(); 870 } 871 if (!FD) 872 return; 873 874 PushDeclContext(S, FD); 875 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 876 ParmVarDecl *Param = FD->getParamDecl(P); 877 // If the parameter has an identifier, then add it to the scope 878 if (Param->getIdentifier()) { 879 S->AddDecl(Param); 880 IdResolver.AddDecl(Param); 881 } 882 } 883} 884 885 886/// \brief Determine whether we allow overloading of the function 887/// PrevDecl with another declaration. 888/// 889/// This routine determines whether overloading is possible, not 890/// whether some new function is actually an overload. It will return 891/// true in C++ (where we can always provide overloads) or, as an 892/// extension, in C when the previous function is already an 893/// overloaded function declaration or has the "overloadable" 894/// attribute. 895static bool AllowOverloadingOfFunction(LookupResult &Previous, 896 ASTContext &Context) { 897 if (Context.getLangOptions().CPlusPlus) 898 return true; 899 900 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 901 return true; 902 903 return (Previous.getResultKind() == LookupResult::Found 904 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 905} 906 907/// Add this decl to the scope shadowed decl chains. 908void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 909 // Move up the scope chain until we find the nearest enclosing 910 // non-transparent context. The declaration will be introduced into this 911 // scope. 912 while (S->getEntity() && 913 ((DeclContext *)S->getEntity())->isTransparentContext()) 914 S = S->getParent(); 915 916 // Add scoped declarations into their context, so that they can be 917 // found later. Declarations without a context won't be inserted 918 // into any context. 919 if (AddToContext) 920 CurContext->addDecl(D); 921 922 // Out-of-line definitions shouldn't be pushed into scope in C++. 923 // Out-of-line variable and function definitions shouldn't even in C. 924 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 925 D->isOutOfLine() && 926 !D->getDeclContext()->getRedeclContext()->Equals( 927 D->getLexicalDeclContext()->getRedeclContext())) 928 return; 929 930 // Template instantiations should also not be pushed into scope. 931 if (isa<FunctionDecl>(D) && 932 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 933 return; 934 935 // If this replaces anything in the current scope, 936 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 937 IEnd = IdResolver.end(); 938 for (; I != IEnd; ++I) { 939 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 940 S->RemoveDecl(*I); 941 IdResolver.RemoveDecl(*I); 942 943 // Should only need to replace one decl. 944 break; 945 } 946 } 947 948 S->AddDecl(D); 949 950 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 951 // Implicitly-generated labels may end up getting generated in an order that 952 // isn't strictly lexical, which breaks name lookup. Be careful to insert 953 // the label at the appropriate place in the identifier chain. 954 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 955 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 956 if (IDC == CurContext) { 957 if (!S->isDeclScope(*I)) 958 continue; 959 } else if (IDC->Encloses(CurContext)) 960 break; 961 } 962 963 IdResolver.InsertDeclAfter(I, D); 964 } else { 965 IdResolver.AddDecl(D); 966 } 967} 968 969void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 970 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 971 TUScope->AddDecl(D); 972} 973 974bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 975 bool ExplicitInstantiationOrSpecialization) { 976 return IdResolver.isDeclInScope(D, Ctx, Context, S, 977 ExplicitInstantiationOrSpecialization); 978} 979 980Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 981 DeclContext *TargetDC = DC->getPrimaryContext(); 982 do { 983 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 984 if (ScopeDC->getPrimaryContext() == TargetDC) 985 return S; 986 } while ((S = S->getParent())); 987 988 return 0; 989} 990 991static bool isOutOfScopePreviousDeclaration(NamedDecl *, 992 DeclContext*, 993 ASTContext&); 994 995/// Filters out lookup results that don't fall within the given scope 996/// as determined by isDeclInScope. 997void Sema::FilterLookupForScope(LookupResult &R, 998 DeclContext *Ctx, Scope *S, 999 bool ConsiderLinkage, 1000 bool ExplicitInstantiationOrSpecialization) { 1001 LookupResult::Filter F = R.makeFilter(); 1002 while (F.hasNext()) { 1003 NamedDecl *D = F.next(); 1004 1005 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 1006 continue; 1007 1008 if (ConsiderLinkage && 1009 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 1010 continue; 1011 1012 F.erase(); 1013 } 1014 1015 F.done(); 1016} 1017 1018static bool isUsingDecl(NamedDecl *D) { 1019 return isa<UsingShadowDecl>(D) || 1020 isa<UnresolvedUsingTypenameDecl>(D) || 1021 isa<UnresolvedUsingValueDecl>(D); 1022} 1023 1024/// Removes using shadow declarations from the lookup results. 1025static void RemoveUsingDecls(LookupResult &R) { 1026 LookupResult::Filter F = R.makeFilter(); 1027 while (F.hasNext()) 1028 if (isUsingDecl(F.next())) 1029 F.erase(); 1030 1031 F.done(); 1032} 1033 1034/// \brief Check for this common pattern: 1035/// @code 1036/// class S { 1037/// S(const S&); // DO NOT IMPLEMENT 1038/// void operator=(const S&); // DO NOT IMPLEMENT 1039/// }; 1040/// @endcode 1041static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1042 // FIXME: Should check for private access too but access is set after we get 1043 // the decl here. 1044 if (D->doesThisDeclarationHaveABody()) 1045 return false; 1046 1047 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1048 return CD->isCopyConstructor(); 1049 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1050 return Method->isCopyAssignmentOperator(); 1051 return false; 1052} 1053 1054bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1055 assert(D); 1056 1057 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1058 return false; 1059 1060 // Ignore class templates. 1061 if (D->getDeclContext()->isDependentContext() || 1062 D->getLexicalDeclContext()->isDependentContext()) 1063 return false; 1064 1065 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1066 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1067 return false; 1068 1069 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1070 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1071 return false; 1072 } else { 1073 // 'static inline' functions are used in headers; don't warn. 1074 if (FD->getStorageClass() == SC_Static && 1075 FD->isInlineSpecified()) 1076 return false; 1077 } 1078 1079 if (FD->doesThisDeclarationHaveABody() && 1080 Context.DeclMustBeEmitted(FD)) 1081 return false; 1082 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1083 if (!VD->isFileVarDecl() || 1084 VD->getType().isConstant(Context) || 1085 Context.DeclMustBeEmitted(VD)) 1086 return false; 1087 1088 if (VD->isStaticDataMember() && 1089 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1090 return false; 1091 1092 } else { 1093 return false; 1094 } 1095 1096 // Only warn for unused decls internal to the translation unit. 1097 if (D->getLinkage() == ExternalLinkage) 1098 return false; 1099 1100 return true; 1101} 1102 1103void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1104 if (!D) 1105 return; 1106 1107 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1108 const FunctionDecl *First = FD->getFirstDeclaration(); 1109 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1110 return; // First should already be in the vector. 1111 } 1112 1113 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1114 const VarDecl *First = VD->getFirstDeclaration(); 1115 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1116 return; // First should already be in the vector. 1117 } 1118 1119 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1120 UnusedFileScopedDecls.push_back(D); 1121 } 1122 1123static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1124 if (D->isInvalidDecl()) 1125 return false; 1126 1127 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1128 return false; 1129 1130 if (isa<LabelDecl>(D)) 1131 return true; 1132 1133 // White-list anything that isn't a local variable. 1134 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1135 !D->getDeclContext()->isFunctionOrMethod()) 1136 return false; 1137 1138 // Types of valid local variables should be complete, so this should succeed. 1139 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1140 1141 // White-list anything with an __attribute__((unused)) type. 1142 QualType Ty = VD->getType(); 1143 1144 // Only look at the outermost level of typedef. 1145 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1146 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1147 return false; 1148 } 1149 1150 // If we failed to complete the type for some reason, or if the type is 1151 // dependent, don't diagnose the variable. 1152 if (Ty->isIncompleteType() || Ty->isDependentType()) 1153 return false; 1154 1155 if (const TagType *TT = Ty->getAs<TagType>()) { 1156 const TagDecl *Tag = TT->getDecl(); 1157 if (Tag->hasAttr<UnusedAttr>()) 1158 return false; 1159 1160 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1161 if (!RD->hasTrivialDestructor()) 1162 return false; 1163 1164 if (const Expr *Init = VD->getInit()) { 1165 const CXXConstructExpr *Construct = 1166 dyn_cast<CXXConstructExpr>(Init); 1167 if (Construct && !Construct->isElidable()) { 1168 CXXConstructorDecl *CD = Construct->getConstructor(); 1169 if (!CD->isTrivial()) 1170 return false; 1171 } 1172 } 1173 } 1174 } 1175 1176 // TODO: __attribute__((unused)) templates? 1177 } 1178 1179 return true; 1180} 1181 1182static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1183 FixItHint &Hint) { 1184 if (isa<LabelDecl>(D)) { 1185 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1186 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1187 if (AfterColon.isInvalid()) 1188 return; 1189 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1190 getCharRange(D->getLocStart(), AfterColon)); 1191 } 1192 return; 1193} 1194 1195/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1196/// unless they are marked attr(unused). 1197void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1198 FixItHint Hint; 1199 if (!ShouldDiagnoseUnusedDecl(D)) 1200 return; 1201 1202 GenerateFixForUnusedDecl(D, Context, Hint); 1203 1204 unsigned DiagID; 1205 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1206 DiagID = diag::warn_unused_exception_param; 1207 else if (isa<LabelDecl>(D)) 1208 DiagID = diag::warn_unused_label; 1209 else 1210 DiagID = diag::warn_unused_variable; 1211 1212 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1213} 1214 1215static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1216 // Verify that we have no forward references left. If so, there was a goto 1217 // or address of a label taken, but no definition of it. Label fwd 1218 // definitions are indicated with a null substmt. 1219 if (L->getStmt() == 0) 1220 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1221} 1222 1223void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1224 if (S->decl_empty()) return; 1225 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1226 "Scope shouldn't contain decls!"); 1227 1228 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1229 I != E; ++I) { 1230 Decl *TmpD = (*I); 1231 assert(TmpD && "This decl didn't get pushed??"); 1232 1233 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1234 NamedDecl *D = cast<NamedDecl>(TmpD); 1235 1236 if (!D->getDeclName()) continue; 1237 1238 // Diagnose unused variables in this scope. 1239 if (!S->hasErrorOccurred()) 1240 DiagnoseUnusedDecl(D); 1241 1242 // If this was a forward reference to a label, verify it was defined. 1243 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1244 CheckPoppedLabel(LD, *this); 1245 1246 // Remove this name from our lexical scope. 1247 IdResolver.RemoveDecl(D); 1248 } 1249} 1250 1251/// \brief Look for an Objective-C class in the translation unit. 1252/// 1253/// \param Id The name of the Objective-C class we're looking for. If 1254/// typo-correction fixes this name, the Id will be updated 1255/// to the fixed name. 1256/// 1257/// \param IdLoc The location of the name in the translation unit. 1258/// 1259/// \param TypoCorrection If true, this routine will attempt typo correction 1260/// if there is no class with the given name. 1261/// 1262/// \returns The declaration of the named Objective-C class, or NULL if the 1263/// class could not be found. 1264ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1265 SourceLocation IdLoc, 1266 bool DoTypoCorrection) { 1267 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1268 // creation from this context. 1269 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1270 1271 if (!IDecl && DoTypoCorrection) { 1272 // Perform typo correction at the given location, but only if we 1273 // find an Objective-C class name. 1274 DeclFilterCCC<ObjCInterfaceDecl> Validator; 1275 if (TypoCorrection C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), 1276 LookupOrdinaryName, TUScope, NULL, 1277 Validator)) { 1278 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>(); 1279 Diag(IdLoc, diag::err_undef_interface_suggest) 1280 << Id << IDecl->getDeclName() 1281 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1282 Diag(IDecl->getLocation(), diag::note_previous_decl) 1283 << IDecl->getDeclName(); 1284 1285 Id = IDecl->getIdentifier(); 1286 } 1287 } 1288 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1289 // This routine must always return a class definition, if any. 1290 if (Def && Def->getDefinition()) 1291 Def = Def->getDefinition(); 1292 return Def; 1293} 1294 1295/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1296/// from S, where a non-field would be declared. This routine copes 1297/// with the difference between C and C++ scoping rules in structs and 1298/// unions. For example, the following code is well-formed in C but 1299/// ill-formed in C++: 1300/// @code 1301/// struct S6 { 1302/// enum { BAR } e; 1303/// }; 1304/// 1305/// void test_S6() { 1306/// struct S6 a; 1307/// a.e = BAR; 1308/// } 1309/// @endcode 1310/// For the declaration of BAR, this routine will return a different 1311/// scope. The scope S will be the scope of the unnamed enumeration 1312/// within S6. In C++, this routine will return the scope associated 1313/// with S6, because the enumeration's scope is a transparent 1314/// context but structures can contain non-field names. In C, this 1315/// routine will return the translation unit scope, since the 1316/// enumeration's scope is a transparent context and structures cannot 1317/// contain non-field names. 1318Scope *Sema::getNonFieldDeclScope(Scope *S) { 1319 while (((S->getFlags() & Scope::DeclScope) == 0) || 1320 (S->getEntity() && 1321 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1322 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1323 S = S->getParent(); 1324 return S; 1325} 1326 1327/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1328/// file scope. lazily create a decl for it. ForRedeclaration is true 1329/// if we're creating this built-in in anticipation of redeclaring the 1330/// built-in. 1331NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1332 Scope *S, bool ForRedeclaration, 1333 SourceLocation Loc) { 1334 Builtin::ID BID = (Builtin::ID)bid; 1335 1336 ASTContext::GetBuiltinTypeError Error; 1337 QualType R = Context.GetBuiltinType(BID, Error); 1338 switch (Error) { 1339 case ASTContext::GE_None: 1340 // Okay 1341 break; 1342 1343 case ASTContext::GE_Missing_stdio: 1344 if (ForRedeclaration) 1345 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1346 << Context.BuiltinInfo.GetName(BID); 1347 return 0; 1348 1349 case ASTContext::GE_Missing_setjmp: 1350 if (ForRedeclaration) 1351 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1352 << Context.BuiltinInfo.GetName(BID); 1353 return 0; 1354 1355 case ASTContext::GE_Missing_ucontext: 1356 if (ForRedeclaration) 1357 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1358 << Context.BuiltinInfo.GetName(BID); 1359 return 0; 1360 } 1361 1362 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1363 Diag(Loc, diag::ext_implicit_lib_function_decl) 1364 << Context.BuiltinInfo.GetName(BID) 1365 << R; 1366 if (Context.BuiltinInfo.getHeaderName(BID) && 1367 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1368 != DiagnosticsEngine::Ignored) 1369 Diag(Loc, diag::note_please_include_header) 1370 << Context.BuiltinInfo.getHeaderName(BID) 1371 << Context.BuiltinInfo.GetName(BID); 1372 } 1373 1374 FunctionDecl *New = FunctionDecl::Create(Context, 1375 Context.getTranslationUnitDecl(), 1376 Loc, Loc, II, R, /*TInfo=*/0, 1377 SC_Extern, 1378 SC_None, false, 1379 /*hasPrototype=*/true); 1380 New->setImplicit(); 1381 1382 // Create Decl objects for each parameter, adding them to the 1383 // FunctionDecl. 1384 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1385 SmallVector<ParmVarDecl*, 16> Params; 1386 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1387 ParmVarDecl *parm = 1388 ParmVarDecl::Create(Context, New, SourceLocation(), 1389 SourceLocation(), 0, 1390 FT->getArgType(i), /*TInfo=*/0, 1391 SC_None, SC_None, 0); 1392 parm->setScopeInfo(0, i); 1393 Params.push_back(parm); 1394 } 1395 New->setParams(Params); 1396 } 1397 1398 AddKnownFunctionAttributes(New); 1399 1400 // TUScope is the translation-unit scope to insert this function into. 1401 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1402 // relate Scopes to DeclContexts, and probably eliminate CurContext 1403 // entirely, but we're not there yet. 1404 DeclContext *SavedContext = CurContext; 1405 CurContext = Context.getTranslationUnitDecl(); 1406 PushOnScopeChains(New, TUScope); 1407 CurContext = SavedContext; 1408 return New; 1409} 1410 1411bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1412 QualType OldType; 1413 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1414 OldType = OldTypedef->getUnderlyingType(); 1415 else 1416 OldType = Context.getTypeDeclType(Old); 1417 QualType NewType = New->getUnderlyingType(); 1418 1419 if (NewType->isVariablyModifiedType()) { 1420 // Must not redefine a typedef with a variably-modified type. 1421 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1422 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1423 << Kind << NewType; 1424 if (Old->getLocation().isValid()) 1425 Diag(Old->getLocation(), diag::note_previous_definition); 1426 New->setInvalidDecl(); 1427 return true; 1428 } 1429 1430 if (OldType != NewType && 1431 !OldType->isDependentType() && 1432 !NewType->isDependentType() && 1433 !Context.hasSameType(OldType, NewType)) { 1434 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1435 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1436 << Kind << NewType << OldType; 1437 if (Old->getLocation().isValid()) 1438 Diag(Old->getLocation(), diag::note_previous_definition); 1439 New->setInvalidDecl(); 1440 return true; 1441 } 1442 return false; 1443} 1444 1445/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1446/// same name and scope as a previous declaration 'Old'. Figure out 1447/// how to resolve this situation, merging decls or emitting 1448/// diagnostics as appropriate. If there was an error, set New to be invalid. 1449/// 1450void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1451 // If the new decl is known invalid already, don't bother doing any 1452 // merging checks. 1453 if (New->isInvalidDecl()) return; 1454 1455 // Allow multiple definitions for ObjC built-in typedefs. 1456 // FIXME: Verify the underlying types are equivalent! 1457 if (getLangOptions().ObjC1) { 1458 const IdentifierInfo *TypeID = New->getIdentifier(); 1459 switch (TypeID->getLength()) { 1460 default: break; 1461 case 2: 1462 if (!TypeID->isStr("id")) 1463 break; 1464 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1465 // Install the built-in type for 'id', ignoring the current definition. 1466 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1467 return; 1468 case 5: 1469 if (!TypeID->isStr("Class")) 1470 break; 1471 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1472 // Install the built-in type for 'Class', ignoring the current definition. 1473 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1474 return; 1475 case 3: 1476 if (!TypeID->isStr("SEL")) 1477 break; 1478 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1479 // Install the built-in type for 'SEL', ignoring the current definition. 1480 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1481 return; 1482 } 1483 // Fall through - the typedef name was not a builtin type. 1484 } 1485 1486 // Verify the old decl was also a type. 1487 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1488 if (!Old) { 1489 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1490 << New->getDeclName(); 1491 1492 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1493 if (OldD->getLocation().isValid()) 1494 Diag(OldD->getLocation(), diag::note_previous_definition); 1495 1496 return New->setInvalidDecl(); 1497 } 1498 1499 // If the old declaration is invalid, just give up here. 1500 if (Old->isInvalidDecl()) 1501 return New->setInvalidDecl(); 1502 1503 // If the typedef types are not identical, reject them in all languages and 1504 // with any extensions enabled. 1505 if (isIncompatibleTypedef(Old, New)) 1506 return; 1507 1508 // The types match. Link up the redeclaration chain if the old 1509 // declaration was a typedef. 1510 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1511 New->setPreviousDeclaration(Typedef); 1512 1513 if (getLangOptions().MicrosoftExt) 1514 return; 1515 1516 if (getLangOptions().CPlusPlus) { 1517 // C++ [dcl.typedef]p2: 1518 // In a given non-class scope, a typedef specifier can be used to 1519 // redefine the name of any type declared in that scope to refer 1520 // to the type to which it already refers. 1521 if (!isa<CXXRecordDecl>(CurContext)) 1522 return; 1523 1524 // C++0x [dcl.typedef]p4: 1525 // In a given class scope, a typedef specifier can be used to redefine 1526 // any class-name declared in that scope that is not also a typedef-name 1527 // to refer to the type to which it already refers. 1528 // 1529 // This wording came in via DR424, which was a correction to the 1530 // wording in DR56, which accidentally banned code like: 1531 // 1532 // struct S { 1533 // typedef struct A { } A; 1534 // }; 1535 // 1536 // in the C++03 standard. We implement the C++0x semantics, which 1537 // allow the above but disallow 1538 // 1539 // struct S { 1540 // typedef int I; 1541 // typedef int I; 1542 // }; 1543 // 1544 // since that was the intent of DR56. 1545 if (!isa<TypedefNameDecl>(Old)) 1546 return; 1547 1548 Diag(New->getLocation(), diag::err_redefinition) 1549 << New->getDeclName(); 1550 Diag(Old->getLocation(), diag::note_previous_definition); 1551 return New->setInvalidDecl(); 1552 } 1553 1554 // Modules always permit redefinition of typedefs, as does C11. 1555 if (getLangOptions().Modules || getLangOptions().C11) 1556 return; 1557 1558 // If we have a redefinition of a typedef in C, emit a warning. This warning 1559 // is normally mapped to an error, but can be controlled with 1560 // -Wtypedef-redefinition. If either the original or the redefinition is 1561 // in a system header, don't emit this for compatibility with GCC. 1562 if (getDiagnostics().getSuppressSystemWarnings() && 1563 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1564 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1565 return; 1566 1567 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1568 << New->getDeclName(); 1569 Diag(Old->getLocation(), diag::note_previous_definition); 1570 return; 1571} 1572 1573/// DeclhasAttr - returns true if decl Declaration already has the target 1574/// attribute. 1575static bool 1576DeclHasAttr(const Decl *D, const Attr *A) { 1577 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1578 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1579 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1580 if ((*i)->getKind() == A->getKind()) { 1581 if (Ann) { 1582 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1583 return true; 1584 continue; 1585 } 1586 // FIXME: Don't hardcode this check 1587 if (OA && isa<OwnershipAttr>(*i)) 1588 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1589 return true; 1590 } 1591 1592 return false; 1593} 1594 1595/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1596void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1597 bool MergeDeprecation) { 1598 if (!Old->hasAttrs()) 1599 return; 1600 1601 bool foundAny = New->hasAttrs(); 1602 1603 // Ensure that any moving of objects within the allocated map is done before 1604 // we process them. 1605 if (!foundAny) New->setAttrs(AttrVec()); 1606 1607 for (specific_attr_iterator<InheritableAttr> 1608 i = Old->specific_attr_begin<InheritableAttr>(), 1609 e = Old->specific_attr_end<InheritableAttr>(); 1610 i != e; ++i) { 1611 // Ignore deprecated/unavailable/availability attributes if requested. 1612 if (!MergeDeprecation && 1613 (isa<DeprecatedAttr>(*i) || 1614 isa<UnavailableAttr>(*i) || 1615 isa<AvailabilityAttr>(*i))) 1616 continue; 1617 1618 if (!DeclHasAttr(New, *i)) { 1619 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1620 newAttr->setInherited(true); 1621 New->addAttr(newAttr); 1622 foundAny = true; 1623 } 1624 } 1625 1626 if (!foundAny) New->dropAttrs(); 1627} 1628 1629/// mergeParamDeclAttributes - Copy attributes from the old parameter 1630/// to the new one. 1631static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1632 const ParmVarDecl *oldDecl, 1633 ASTContext &C) { 1634 if (!oldDecl->hasAttrs()) 1635 return; 1636 1637 bool foundAny = newDecl->hasAttrs(); 1638 1639 // Ensure that any moving of objects within the allocated map is 1640 // done before we process them. 1641 if (!foundAny) newDecl->setAttrs(AttrVec()); 1642 1643 for (specific_attr_iterator<InheritableParamAttr> 1644 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1645 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1646 if (!DeclHasAttr(newDecl, *i)) { 1647 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1648 newAttr->setInherited(true); 1649 newDecl->addAttr(newAttr); 1650 foundAny = true; 1651 } 1652 } 1653 1654 if (!foundAny) newDecl->dropAttrs(); 1655} 1656 1657namespace { 1658 1659/// Used in MergeFunctionDecl to keep track of function parameters in 1660/// C. 1661struct GNUCompatibleParamWarning { 1662 ParmVarDecl *OldParm; 1663 ParmVarDecl *NewParm; 1664 QualType PromotedType; 1665}; 1666 1667} 1668 1669/// getSpecialMember - get the special member enum for a method. 1670Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1671 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1672 if (Ctor->isDefaultConstructor()) 1673 return Sema::CXXDefaultConstructor; 1674 1675 if (Ctor->isCopyConstructor()) 1676 return Sema::CXXCopyConstructor; 1677 1678 if (Ctor->isMoveConstructor()) 1679 return Sema::CXXMoveConstructor; 1680 } else if (isa<CXXDestructorDecl>(MD)) { 1681 return Sema::CXXDestructor; 1682 } else if (MD->isCopyAssignmentOperator()) { 1683 return Sema::CXXCopyAssignment; 1684 } else if (MD->isMoveAssignmentOperator()) { 1685 return Sema::CXXMoveAssignment; 1686 } 1687 1688 return Sema::CXXInvalid; 1689} 1690 1691/// canRedefineFunction - checks if a function can be redefined. Currently, 1692/// only extern inline functions can be redefined, and even then only in 1693/// GNU89 mode. 1694static bool canRedefineFunction(const FunctionDecl *FD, 1695 const LangOptions& LangOpts) { 1696 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1697 !LangOpts.CPlusPlus && 1698 FD->isInlineSpecified() && 1699 FD->getStorageClass() == SC_Extern); 1700} 1701 1702/// MergeFunctionDecl - We just parsed a function 'New' from 1703/// declarator D which has the same name and scope as a previous 1704/// declaration 'Old'. Figure out how to resolve this situation, 1705/// merging decls or emitting diagnostics as appropriate. 1706/// 1707/// In C++, New and Old must be declarations that are not 1708/// overloaded. Use IsOverload to determine whether New and Old are 1709/// overloaded, and to select the Old declaration that New should be 1710/// merged with. 1711/// 1712/// Returns true if there was an error, false otherwise. 1713bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1714 // Verify the old decl was also a function. 1715 FunctionDecl *Old = 0; 1716 if (FunctionTemplateDecl *OldFunctionTemplate 1717 = dyn_cast<FunctionTemplateDecl>(OldD)) 1718 Old = OldFunctionTemplate->getTemplatedDecl(); 1719 else 1720 Old = dyn_cast<FunctionDecl>(OldD); 1721 if (!Old) { 1722 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1723 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1724 Diag(Shadow->getTargetDecl()->getLocation(), 1725 diag::note_using_decl_target); 1726 Diag(Shadow->getUsingDecl()->getLocation(), 1727 diag::note_using_decl) << 0; 1728 return true; 1729 } 1730 1731 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1732 << New->getDeclName(); 1733 Diag(OldD->getLocation(), diag::note_previous_definition); 1734 return true; 1735 } 1736 1737 // Determine whether the previous declaration was a definition, 1738 // implicit declaration, or a declaration. 1739 diag::kind PrevDiag; 1740 if (Old->isThisDeclarationADefinition()) 1741 PrevDiag = diag::note_previous_definition; 1742 else if (Old->isImplicit()) 1743 PrevDiag = diag::note_previous_implicit_declaration; 1744 else 1745 PrevDiag = diag::note_previous_declaration; 1746 1747 QualType OldQType = Context.getCanonicalType(Old->getType()); 1748 QualType NewQType = Context.getCanonicalType(New->getType()); 1749 1750 // Don't complain about this if we're in GNU89 mode and the old function 1751 // is an extern inline function. 1752 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1753 New->getStorageClass() == SC_Static && 1754 Old->getStorageClass() != SC_Static && 1755 !canRedefineFunction(Old, getLangOptions())) { 1756 if (getLangOptions().MicrosoftExt) { 1757 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1758 Diag(Old->getLocation(), PrevDiag); 1759 } else { 1760 Diag(New->getLocation(), diag::err_static_non_static) << New; 1761 Diag(Old->getLocation(), PrevDiag); 1762 return true; 1763 } 1764 } 1765 1766 // If a function is first declared with a calling convention, but is 1767 // later declared or defined without one, the second decl assumes the 1768 // calling convention of the first. 1769 // 1770 // For the new decl, we have to look at the NON-canonical type to tell the 1771 // difference between a function that really doesn't have a calling 1772 // convention and one that is declared cdecl. That's because in 1773 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1774 // because it is the default calling convention. 1775 // 1776 // Note also that we DO NOT return at this point, because we still have 1777 // other tests to run. 1778 const FunctionType *OldType = cast<FunctionType>(OldQType); 1779 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1780 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1781 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1782 bool RequiresAdjustment = false; 1783 if (OldTypeInfo.getCC() != CC_Default && 1784 NewTypeInfo.getCC() == CC_Default) { 1785 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1786 RequiresAdjustment = true; 1787 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1788 NewTypeInfo.getCC())) { 1789 // Calling conventions really aren't compatible, so complain. 1790 Diag(New->getLocation(), diag::err_cconv_change) 1791 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1792 << (OldTypeInfo.getCC() == CC_Default) 1793 << (OldTypeInfo.getCC() == CC_Default ? "" : 1794 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1795 Diag(Old->getLocation(), diag::note_previous_declaration); 1796 return true; 1797 } 1798 1799 // FIXME: diagnose the other way around? 1800 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1801 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1802 RequiresAdjustment = true; 1803 } 1804 1805 // Merge regparm attribute. 1806 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1807 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1808 if (NewTypeInfo.getHasRegParm()) { 1809 Diag(New->getLocation(), diag::err_regparm_mismatch) 1810 << NewType->getRegParmType() 1811 << OldType->getRegParmType(); 1812 Diag(Old->getLocation(), diag::note_previous_declaration); 1813 return true; 1814 } 1815 1816 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1817 RequiresAdjustment = true; 1818 } 1819 1820 // Merge ns_returns_retained attribute. 1821 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1822 if (NewTypeInfo.getProducesResult()) { 1823 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1824 Diag(Old->getLocation(), diag::note_previous_declaration); 1825 return true; 1826 } 1827 1828 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1829 RequiresAdjustment = true; 1830 } 1831 1832 if (RequiresAdjustment) { 1833 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1834 New->setType(QualType(NewType, 0)); 1835 NewQType = Context.getCanonicalType(New->getType()); 1836 } 1837 1838 if (getLangOptions().CPlusPlus) { 1839 // (C++98 13.1p2): 1840 // Certain function declarations cannot be overloaded: 1841 // -- Function declarations that differ only in the return type 1842 // cannot be overloaded. 1843 QualType OldReturnType = OldType->getResultType(); 1844 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1845 QualType ResQT; 1846 if (OldReturnType != NewReturnType) { 1847 if (NewReturnType->isObjCObjectPointerType() 1848 && OldReturnType->isObjCObjectPointerType()) 1849 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1850 if (ResQT.isNull()) { 1851 if (New->isCXXClassMember() && New->isOutOfLine()) 1852 Diag(New->getLocation(), 1853 diag::err_member_def_does_not_match_ret_type) << New; 1854 else 1855 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1856 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1857 return true; 1858 } 1859 else 1860 NewQType = ResQT; 1861 } 1862 1863 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1864 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1865 if (OldMethod && NewMethod) { 1866 // Preserve triviality. 1867 NewMethod->setTrivial(OldMethod->isTrivial()); 1868 1869 // MSVC allows explicit template specialization at class scope: 1870 // 2 CXMethodDecls referring to the same function will be injected. 1871 // We don't want a redeclartion error. 1872 bool IsClassScopeExplicitSpecialization = 1873 OldMethod->isFunctionTemplateSpecialization() && 1874 NewMethod->isFunctionTemplateSpecialization(); 1875 bool isFriend = NewMethod->getFriendObjectKind(); 1876 1877 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1878 !IsClassScopeExplicitSpecialization) { 1879 // -- Member function declarations with the same name and the 1880 // same parameter types cannot be overloaded if any of them 1881 // is a static member function declaration. 1882 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1883 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1884 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1885 return true; 1886 } 1887 1888 // C++ [class.mem]p1: 1889 // [...] A member shall not be declared twice in the 1890 // member-specification, except that a nested class or member 1891 // class template can be declared and then later defined. 1892 unsigned NewDiag; 1893 if (isa<CXXConstructorDecl>(OldMethod)) 1894 NewDiag = diag::err_constructor_redeclared; 1895 else if (isa<CXXDestructorDecl>(NewMethod)) 1896 NewDiag = diag::err_destructor_redeclared; 1897 else if (isa<CXXConversionDecl>(NewMethod)) 1898 NewDiag = diag::err_conv_function_redeclared; 1899 else 1900 NewDiag = diag::err_member_redeclared; 1901 1902 Diag(New->getLocation(), NewDiag); 1903 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1904 1905 // Complain if this is an explicit declaration of a special 1906 // member that was initially declared implicitly. 1907 // 1908 // As an exception, it's okay to befriend such methods in order 1909 // to permit the implicit constructor/destructor/operator calls. 1910 } else if (OldMethod->isImplicit()) { 1911 if (isFriend) { 1912 NewMethod->setImplicit(); 1913 } else { 1914 Diag(NewMethod->getLocation(), 1915 diag::err_definition_of_implicitly_declared_member) 1916 << New << getSpecialMember(OldMethod); 1917 return true; 1918 } 1919 } else if (OldMethod->isExplicitlyDefaulted()) { 1920 Diag(NewMethod->getLocation(), 1921 diag::err_definition_of_explicitly_defaulted_member) 1922 << getSpecialMember(OldMethod); 1923 return true; 1924 } 1925 } 1926 1927 // (C++98 8.3.5p3): 1928 // All declarations for a function shall agree exactly in both the 1929 // return type and the parameter-type-list. 1930 // We also want to respect all the extended bits except noreturn. 1931 1932 // noreturn should now match unless the old type info didn't have it. 1933 QualType OldQTypeForComparison = OldQType; 1934 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1935 assert(OldQType == QualType(OldType, 0)); 1936 const FunctionType *OldTypeForComparison 1937 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1938 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1939 assert(OldQTypeForComparison.isCanonical()); 1940 } 1941 1942 if (OldQTypeForComparison == NewQType) 1943 return MergeCompatibleFunctionDecls(New, Old); 1944 1945 // Fall through for conflicting redeclarations and redefinitions. 1946 } 1947 1948 // C: Function types need to be compatible, not identical. This handles 1949 // duplicate function decls like "void f(int); void f(enum X);" properly. 1950 if (!getLangOptions().CPlusPlus && 1951 Context.typesAreCompatible(OldQType, NewQType)) { 1952 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1953 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1954 const FunctionProtoType *OldProto = 0; 1955 if (isa<FunctionNoProtoType>(NewFuncType) && 1956 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1957 // The old declaration provided a function prototype, but the 1958 // new declaration does not. Merge in the prototype. 1959 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1960 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1961 OldProto->arg_type_end()); 1962 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1963 ParamTypes.data(), ParamTypes.size(), 1964 OldProto->getExtProtoInfo()); 1965 New->setType(NewQType); 1966 New->setHasInheritedPrototype(); 1967 1968 // Synthesize a parameter for each argument type. 1969 SmallVector<ParmVarDecl*, 16> Params; 1970 for (FunctionProtoType::arg_type_iterator 1971 ParamType = OldProto->arg_type_begin(), 1972 ParamEnd = OldProto->arg_type_end(); 1973 ParamType != ParamEnd; ++ParamType) { 1974 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1975 SourceLocation(), 1976 SourceLocation(), 0, 1977 *ParamType, /*TInfo=*/0, 1978 SC_None, SC_None, 1979 0); 1980 Param->setScopeInfo(0, Params.size()); 1981 Param->setImplicit(); 1982 Params.push_back(Param); 1983 } 1984 1985 New->setParams(Params); 1986 } 1987 1988 return MergeCompatibleFunctionDecls(New, Old); 1989 } 1990 1991 // GNU C permits a K&R definition to follow a prototype declaration 1992 // if the declared types of the parameters in the K&R definition 1993 // match the types in the prototype declaration, even when the 1994 // promoted types of the parameters from the K&R definition differ 1995 // from the types in the prototype. GCC then keeps the types from 1996 // the prototype. 1997 // 1998 // If a variadic prototype is followed by a non-variadic K&R definition, 1999 // the K&R definition becomes variadic. This is sort of an edge case, but 2000 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 2001 // C99 6.9.1p8. 2002 if (!getLangOptions().CPlusPlus && 2003 Old->hasPrototype() && !New->hasPrototype() && 2004 New->getType()->getAs<FunctionProtoType>() && 2005 Old->getNumParams() == New->getNumParams()) { 2006 SmallVector<QualType, 16> ArgTypes; 2007 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 2008 const FunctionProtoType *OldProto 2009 = Old->getType()->getAs<FunctionProtoType>(); 2010 const FunctionProtoType *NewProto 2011 = New->getType()->getAs<FunctionProtoType>(); 2012 2013 // Determine whether this is the GNU C extension. 2014 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 2015 NewProto->getResultType()); 2016 bool LooseCompatible = !MergedReturn.isNull(); 2017 for (unsigned Idx = 0, End = Old->getNumParams(); 2018 LooseCompatible && Idx != End; ++Idx) { 2019 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 2020 ParmVarDecl *NewParm = New->getParamDecl(Idx); 2021 if (Context.typesAreCompatible(OldParm->getType(), 2022 NewProto->getArgType(Idx))) { 2023 ArgTypes.push_back(NewParm->getType()); 2024 } else if (Context.typesAreCompatible(OldParm->getType(), 2025 NewParm->getType(), 2026 /*CompareUnqualified=*/true)) { 2027 GNUCompatibleParamWarning Warn 2028 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 2029 Warnings.push_back(Warn); 2030 ArgTypes.push_back(NewParm->getType()); 2031 } else 2032 LooseCompatible = false; 2033 } 2034 2035 if (LooseCompatible) { 2036 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2037 Diag(Warnings[Warn].NewParm->getLocation(), 2038 diag::ext_param_promoted_not_compatible_with_prototype) 2039 << Warnings[Warn].PromotedType 2040 << Warnings[Warn].OldParm->getType(); 2041 if (Warnings[Warn].OldParm->getLocation().isValid()) 2042 Diag(Warnings[Warn].OldParm->getLocation(), 2043 diag::note_previous_declaration); 2044 } 2045 2046 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2047 ArgTypes.size(), 2048 OldProto->getExtProtoInfo())); 2049 return MergeCompatibleFunctionDecls(New, Old); 2050 } 2051 2052 // Fall through to diagnose conflicting types. 2053 } 2054 2055 // A function that has already been declared has been redeclared or defined 2056 // with a different type- show appropriate diagnostic 2057 if (unsigned BuiltinID = Old->getBuiltinID()) { 2058 // The user has declared a builtin function with an incompatible 2059 // signature. 2060 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2061 // The function the user is redeclaring is a library-defined 2062 // function like 'malloc' or 'printf'. Warn about the 2063 // redeclaration, then pretend that we don't know about this 2064 // library built-in. 2065 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2066 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2067 << Old << Old->getType(); 2068 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2069 Old->setInvalidDecl(); 2070 return false; 2071 } 2072 2073 PrevDiag = diag::note_previous_builtin_declaration; 2074 } 2075 2076 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2077 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2078 return true; 2079} 2080 2081/// \brief Completes the merge of two function declarations that are 2082/// known to be compatible. 2083/// 2084/// This routine handles the merging of attributes and other 2085/// properties of function declarations form the old declaration to 2086/// the new declaration, once we know that New is in fact a 2087/// redeclaration of Old. 2088/// 2089/// \returns false 2090bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2091 // Merge the attributes 2092 mergeDeclAttributes(New, Old); 2093 2094 // Merge the storage class. 2095 if (Old->getStorageClass() != SC_Extern && 2096 Old->getStorageClass() != SC_None) 2097 New->setStorageClass(Old->getStorageClass()); 2098 2099 // Merge "pure" flag. 2100 if (Old->isPure()) 2101 New->setPure(); 2102 2103 // Merge attributes from the parameters. These can mismatch with K&R 2104 // declarations. 2105 if (New->getNumParams() == Old->getNumParams()) 2106 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2107 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2108 Context); 2109 2110 if (getLangOptions().CPlusPlus) 2111 return MergeCXXFunctionDecl(New, Old); 2112 2113 return false; 2114} 2115 2116 2117void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2118 ObjCMethodDecl *oldMethod) { 2119 // We don't want to merge unavailable and deprecated attributes 2120 // except from interface to implementation. 2121 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2122 2123 // Merge the attributes. 2124 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2125 2126 // Merge attributes from the parameters. 2127 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2128 for (ObjCMethodDecl::param_iterator 2129 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2130 ni != ne; ++ni, ++oi) 2131 mergeParamDeclAttributes(*ni, *oi, Context); 2132 2133 CheckObjCMethodOverride(newMethod, oldMethod, true); 2134} 2135 2136/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2137/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2138/// emitting diagnostics as appropriate. 2139/// 2140/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2141/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2142/// check them before the initializer is attached. 2143/// 2144void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2145 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2146 return; 2147 2148 QualType MergedT; 2149 if (getLangOptions().CPlusPlus) { 2150 AutoType *AT = New->getType()->getContainedAutoType(); 2151 if (AT && !AT->isDeduced()) { 2152 // We don't know what the new type is until the initializer is attached. 2153 return; 2154 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2155 // These could still be something that needs exception specs checked. 2156 return MergeVarDeclExceptionSpecs(New, Old); 2157 } 2158 // C++ [basic.link]p10: 2159 // [...] the types specified by all declarations referring to a given 2160 // object or function shall be identical, except that declarations for an 2161 // array object can specify array types that differ by the presence or 2162 // absence of a major array bound (8.3.4). 2163 else if (Old->getType()->isIncompleteArrayType() && 2164 New->getType()->isArrayType()) { 2165 CanQual<ArrayType> OldArray 2166 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2167 CanQual<ArrayType> NewArray 2168 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2169 if (OldArray->getElementType() == NewArray->getElementType()) 2170 MergedT = New->getType(); 2171 } else if (Old->getType()->isArrayType() && 2172 New->getType()->isIncompleteArrayType()) { 2173 CanQual<ArrayType> OldArray 2174 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2175 CanQual<ArrayType> NewArray 2176 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2177 if (OldArray->getElementType() == NewArray->getElementType()) 2178 MergedT = Old->getType(); 2179 } else if (New->getType()->isObjCObjectPointerType() 2180 && Old->getType()->isObjCObjectPointerType()) { 2181 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2182 Old->getType()); 2183 } 2184 } else { 2185 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2186 } 2187 if (MergedT.isNull()) { 2188 Diag(New->getLocation(), diag::err_redefinition_different_type) 2189 << New->getDeclName(); 2190 Diag(Old->getLocation(), diag::note_previous_definition); 2191 return New->setInvalidDecl(); 2192 } 2193 New->setType(MergedT); 2194} 2195 2196/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2197/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2198/// situation, merging decls or emitting diagnostics as appropriate. 2199/// 2200/// Tentative definition rules (C99 6.9.2p2) are checked by 2201/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2202/// definitions here, since the initializer hasn't been attached. 2203/// 2204void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2205 // If the new decl is already invalid, don't do any other checking. 2206 if (New->isInvalidDecl()) 2207 return; 2208 2209 // Verify the old decl was also a variable. 2210 VarDecl *Old = 0; 2211 if (!Previous.isSingleResult() || 2212 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2213 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2214 << New->getDeclName(); 2215 Diag(Previous.getRepresentativeDecl()->getLocation(), 2216 diag::note_previous_definition); 2217 return New->setInvalidDecl(); 2218 } 2219 2220 // C++ [class.mem]p1: 2221 // A member shall not be declared twice in the member-specification [...] 2222 // 2223 // Here, we need only consider static data members. 2224 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2225 Diag(New->getLocation(), diag::err_duplicate_member) 2226 << New->getIdentifier(); 2227 Diag(Old->getLocation(), diag::note_previous_declaration); 2228 New->setInvalidDecl(); 2229 } 2230 2231 mergeDeclAttributes(New, Old); 2232 // Warn if an already-declared variable is made a weak_import in a subsequent 2233 // declaration 2234 if (New->getAttr<WeakImportAttr>() && 2235 Old->getStorageClass() == SC_None && 2236 !Old->getAttr<WeakImportAttr>()) { 2237 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2238 Diag(Old->getLocation(), diag::note_previous_definition); 2239 // Remove weak_import attribute on new declaration. 2240 New->dropAttr<WeakImportAttr>(); 2241 } 2242 2243 // Merge the types. 2244 MergeVarDeclTypes(New, Old); 2245 if (New->isInvalidDecl()) 2246 return; 2247 2248 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2249 if (New->getStorageClass() == SC_Static && 2250 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2251 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2252 Diag(Old->getLocation(), diag::note_previous_definition); 2253 return New->setInvalidDecl(); 2254 } 2255 // C99 6.2.2p4: 2256 // For an identifier declared with the storage-class specifier 2257 // extern in a scope in which a prior declaration of that 2258 // identifier is visible,23) if the prior declaration specifies 2259 // internal or external linkage, the linkage of the identifier at 2260 // the later declaration is the same as the linkage specified at 2261 // the prior declaration. If no prior declaration is visible, or 2262 // if the prior declaration specifies no linkage, then the 2263 // identifier has external linkage. 2264 if (New->hasExternalStorage() && Old->hasLinkage()) 2265 /* Okay */; 2266 else if (New->getStorageClass() != SC_Static && 2267 Old->getStorageClass() == SC_Static) { 2268 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2269 Diag(Old->getLocation(), diag::note_previous_definition); 2270 return New->setInvalidDecl(); 2271 } 2272 2273 // Check if extern is followed by non-extern and vice-versa. 2274 if (New->hasExternalStorage() && 2275 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2276 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2277 Diag(Old->getLocation(), diag::note_previous_definition); 2278 return New->setInvalidDecl(); 2279 } 2280 if (Old->hasExternalStorage() && 2281 !New->hasLinkage() && New->isLocalVarDecl()) { 2282 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2283 Diag(Old->getLocation(), diag::note_previous_definition); 2284 return New->setInvalidDecl(); 2285 } 2286 2287 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2288 2289 // FIXME: The test for external storage here seems wrong? We still 2290 // need to check for mismatches. 2291 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2292 // Don't complain about out-of-line definitions of static members. 2293 !(Old->getLexicalDeclContext()->isRecord() && 2294 !New->getLexicalDeclContext()->isRecord())) { 2295 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2296 Diag(Old->getLocation(), diag::note_previous_definition); 2297 return New->setInvalidDecl(); 2298 } 2299 2300 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2301 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2302 Diag(Old->getLocation(), diag::note_previous_definition); 2303 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2304 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2305 Diag(Old->getLocation(), diag::note_previous_definition); 2306 } 2307 2308 // C++ doesn't have tentative definitions, so go right ahead and check here. 2309 const VarDecl *Def; 2310 if (getLangOptions().CPlusPlus && 2311 New->isThisDeclarationADefinition() == VarDecl::Definition && 2312 (Def = Old->getDefinition())) { 2313 Diag(New->getLocation(), diag::err_redefinition) 2314 << New->getDeclName(); 2315 Diag(Def->getLocation(), diag::note_previous_definition); 2316 New->setInvalidDecl(); 2317 return; 2318 } 2319 // c99 6.2.2 P4. 2320 // For an identifier declared with the storage-class specifier extern in a 2321 // scope in which a prior declaration of that identifier is visible, if 2322 // the prior declaration specifies internal or external linkage, the linkage 2323 // of the identifier at the later declaration is the same as the linkage 2324 // specified at the prior declaration. 2325 // FIXME. revisit this code. 2326 if (New->hasExternalStorage() && 2327 Old->getLinkage() == InternalLinkage && 2328 New->getDeclContext() == Old->getDeclContext()) 2329 New->setStorageClass(Old->getStorageClass()); 2330 2331 // Keep a chain of previous declarations. 2332 New->setPreviousDeclaration(Old); 2333 2334 // Inherit access appropriately. 2335 New->setAccess(Old->getAccess()); 2336} 2337 2338/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2339/// no declarator (e.g. "struct foo;") is parsed. 2340Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2341 DeclSpec &DS) { 2342 return ParsedFreeStandingDeclSpec(S, AS, DS, 2343 MultiTemplateParamsArg(*this, 0, 0)); 2344} 2345 2346/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2347/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2348/// parameters to cope with template friend declarations. 2349Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2350 DeclSpec &DS, 2351 MultiTemplateParamsArg TemplateParams) { 2352 Decl *TagD = 0; 2353 TagDecl *Tag = 0; 2354 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2355 DS.getTypeSpecType() == DeclSpec::TST_struct || 2356 DS.getTypeSpecType() == DeclSpec::TST_union || 2357 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2358 TagD = DS.getRepAsDecl(); 2359 2360 if (!TagD) // We probably had an error 2361 return 0; 2362 2363 // Note that the above type specs guarantee that the 2364 // type rep is a Decl, whereas in many of the others 2365 // it's a Type. 2366 if (isa<TagDecl>(TagD)) 2367 Tag = cast<TagDecl>(TagD); 2368 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2369 Tag = CTD->getTemplatedDecl(); 2370 } 2371 2372 if (Tag) 2373 Tag->setFreeStanding(); 2374 2375 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2376 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2377 // or incomplete types shall not be restrict-qualified." 2378 if (TypeQuals & DeclSpec::TQ_restrict) 2379 Diag(DS.getRestrictSpecLoc(), 2380 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2381 << DS.getSourceRange(); 2382 } 2383 2384 if (DS.isConstexprSpecified()) { 2385 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2386 // and definitions of functions and variables. 2387 if (Tag) 2388 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2389 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2390 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2391 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2392 else 2393 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2394 // Don't emit warnings after this error. 2395 return TagD; 2396 } 2397 2398 if (DS.isFriendSpecified()) { 2399 // If we're dealing with a decl but not a TagDecl, assume that 2400 // whatever routines created it handled the friendship aspect. 2401 if (TagD && !Tag) 2402 return 0; 2403 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2404 } 2405 2406 // Track whether we warned about the fact that there aren't any 2407 // declarators. 2408 bool emittedWarning = false; 2409 2410 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2411 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2412 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2413 if (getLangOptions().CPlusPlus || 2414 Record->getDeclContext()->isRecord()) 2415 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2416 2417 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2418 << DS.getSourceRange(); 2419 emittedWarning = true; 2420 } 2421 } 2422 2423 // Check for Microsoft C extension: anonymous struct. 2424 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2425 CurContext->isRecord() && 2426 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2427 // Handle 2 kinds of anonymous struct: 2428 // struct STRUCT; 2429 // and 2430 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2431 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2432 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2433 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2434 DS.getRepAsType().get()->isStructureType())) { 2435 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2436 << DS.getSourceRange(); 2437 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2438 } 2439 } 2440 2441 if (getLangOptions().CPlusPlus && 2442 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2443 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2444 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2445 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2446 Diag(Enum->getLocation(), diag::ext_no_declarators) 2447 << DS.getSourceRange(); 2448 emittedWarning = true; 2449 } 2450 2451 // Skip all the checks below if we have a type error. 2452 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2453 2454 if (!DS.isMissingDeclaratorOk()) { 2455 // Warn about typedefs of enums without names, since this is an 2456 // extension in both Microsoft and GNU. 2457 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2458 Tag && isa<EnumDecl>(Tag)) { 2459 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2460 << DS.getSourceRange(); 2461 return Tag; 2462 } 2463 2464 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2465 << DS.getSourceRange(); 2466 emittedWarning = true; 2467 } 2468 2469 // We're going to complain about a bunch of spurious specifiers; 2470 // only do this if we're declaring a tag, because otherwise we 2471 // should be getting diag::ext_no_declarators. 2472 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2473 return TagD; 2474 2475 // Note that a linkage-specification sets a storage class, but 2476 // 'extern "C" struct foo;' is actually valid and not theoretically 2477 // useless. 2478 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2479 if (!DS.isExternInLinkageSpec()) 2480 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2481 << DeclSpec::getSpecifierName(scs); 2482 2483 if (DS.isThreadSpecified()) 2484 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2485 if (DS.getTypeQualifiers()) { 2486 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2487 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2488 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2489 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2490 // Restrict is covered above. 2491 } 2492 if (DS.isInlineSpecified()) 2493 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2494 if (DS.isVirtualSpecified()) 2495 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2496 if (DS.isExplicitSpecified()) 2497 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2498 2499 if (DS.isModulePrivateSpecified() && 2500 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2501 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2502 << Tag->getTagKind() 2503 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2504 2505 // Warn about ignored type attributes, for example: 2506 // __attribute__((aligned)) struct A; 2507 // Attributes should be placed after tag to apply to type declaration. 2508 if (!DS.getAttributes().empty()) { 2509 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2510 if (TypeSpecType == DeclSpec::TST_class || 2511 TypeSpecType == DeclSpec::TST_struct || 2512 TypeSpecType == DeclSpec::TST_union || 2513 TypeSpecType == DeclSpec::TST_enum) { 2514 AttributeList* attrs = DS.getAttributes().getList(); 2515 while (attrs) { 2516 Diag(attrs->getScopeLoc(), 2517 diag::warn_declspec_attribute_ignored) 2518 << attrs->getName() 2519 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2520 TypeSpecType == DeclSpec::TST_struct ? 1 : 2521 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2522 attrs = attrs->getNext(); 2523 } 2524 } 2525 } 2526 2527 return TagD; 2528} 2529 2530/// We are trying to inject an anonymous member into the given scope; 2531/// check if there's an existing declaration that can't be overloaded. 2532/// 2533/// \return true if this is a forbidden redeclaration 2534static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2535 Scope *S, 2536 DeclContext *Owner, 2537 DeclarationName Name, 2538 SourceLocation NameLoc, 2539 unsigned diagnostic) { 2540 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2541 Sema::ForRedeclaration); 2542 if (!SemaRef.LookupName(R, S)) return false; 2543 2544 if (R.getAsSingle<TagDecl>()) 2545 return false; 2546 2547 // Pick a representative declaration. 2548 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2549 assert(PrevDecl && "Expected a non-null Decl"); 2550 2551 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2552 return false; 2553 2554 SemaRef.Diag(NameLoc, diagnostic) << Name; 2555 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2556 2557 return true; 2558} 2559 2560/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2561/// anonymous struct or union AnonRecord into the owning context Owner 2562/// and scope S. This routine will be invoked just after we realize 2563/// that an unnamed union or struct is actually an anonymous union or 2564/// struct, e.g., 2565/// 2566/// @code 2567/// union { 2568/// int i; 2569/// float f; 2570/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2571/// // f into the surrounding scope.x 2572/// @endcode 2573/// 2574/// This routine is recursive, injecting the names of nested anonymous 2575/// structs/unions into the owning context and scope as well. 2576static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2577 DeclContext *Owner, 2578 RecordDecl *AnonRecord, 2579 AccessSpecifier AS, 2580 SmallVector<NamedDecl*, 2> &Chaining, 2581 bool MSAnonStruct) { 2582 unsigned diagKind 2583 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2584 : diag::err_anonymous_struct_member_redecl; 2585 2586 bool Invalid = false; 2587 2588 // Look every FieldDecl and IndirectFieldDecl with a name. 2589 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2590 DEnd = AnonRecord->decls_end(); 2591 D != DEnd; ++D) { 2592 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2593 cast<NamedDecl>(*D)->getDeclName()) { 2594 ValueDecl *VD = cast<ValueDecl>(*D); 2595 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2596 VD->getLocation(), diagKind)) { 2597 // C++ [class.union]p2: 2598 // The names of the members of an anonymous union shall be 2599 // distinct from the names of any other entity in the 2600 // scope in which the anonymous union is declared. 2601 Invalid = true; 2602 } else { 2603 // C++ [class.union]p2: 2604 // For the purpose of name lookup, after the anonymous union 2605 // definition, the members of the anonymous union are 2606 // considered to have been defined in the scope in which the 2607 // anonymous union is declared. 2608 unsigned OldChainingSize = Chaining.size(); 2609 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2610 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2611 PE = IF->chain_end(); PI != PE; ++PI) 2612 Chaining.push_back(*PI); 2613 else 2614 Chaining.push_back(VD); 2615 2616 assert(Chaining.size() >= 2); 2617 NamedDecl **NamedChain = 2618 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2619 for (unsigned i = 0; i < Chaining.size(); i++) 2620 NamedChain[i] = Chaining[i]; 2621 2622 IndirectFieldDecl* IndirectField = 2623 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2624 VD->getIdentifier(), VD->getType(), 2625 NamedChain, Chaining.size()); 2626 2627 IndirectField->setAccess(AS); 2628 IndirectField->setImplicit(); 2629 SemaRef.PushOnScopeChains(IndirectField, S); 2630 2631 // That includes picking up the appropriate access specifier. 2632 if (AS != AS_none) IndirectField->setAccess(AS); 2633 2634 Chaining.resize(OldChainingSize); 2635 } 2636 } 2637 } 2638 2639 return Invalid; 2640} 2641 2642/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2643/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2644/// illegal input values are mapped to SC_None. 2645static StorageClass 2646StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2647 switch (StorageClassSpec) { 2648 case DeclSpec::SCS_unspecified: return SC_None; 2649 case DeclSpec::SCS_extern: return SC_Extern; 2650 case DeclSpec::SCS_static: return SC_Static; 2651 case DeclSpec::SCS_auto: return SC_Auto; 2652 case DeclSpec::SCS_register: return SC_Register; 2653 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2654 // Illegal SCSs map to None: error reporting is up to the caller. 2655 case DeclSpec::SCS_mutable: // Fall through. 2656 case DeclSpec::SCS_typedef: return SC_None; 2657 } 2658 llvm_unreachable("unknown storage class specifier"); 2659} 2660 2661/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2662/// a StorageClass. Any error reporting is up to the caller: 2663/// illegal input values are mapped to SC_None. 2664static StorageClass 2665StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2666 switch (StorageClassSpec) { 2667 case DeclSpec::SCS_unspecified: return SC_None; 2668 case DeclSpec::SCS_extern: return SC_Extern; 2669 case DeclSpec::SCS_static: return SC_Static; 2670 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2671 // Illegal SCSs map to None: error reporting is up to the caller. 2672 case DeclSpec::SCS_auto: // Fall through. 2673 case DeclSpec::SCS_mutable: // Fall through. 2674 case DeclSpec::SCS_register: // Fall through. 2675 case DeclSpec::SCS_typedef: return SC_None; 2676 } 2677 llvm_unreachable("unknown storage class specifier"); 2678} 2679 2680/// BuildAnonymousStructOrUnion - Handle the declaration of an 2681/// anonymous structure or union. Anonymous unions are a C++ feature 2682/// (C++ [class.union]) and a GNU C extension; anonymous structures 2683/// are a GNU C and GNU C++ extension. 2684Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2685 AccessSpecifier AS, 2686 RecordDecl *Record) { 2687 DeclContext *Owner = Record->getDeclContext(); 2688 2689 // Diagnose whether this anonymous struct/union is an extension. 2690 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2691 Diag(Record->getLocation(), diag::ext_anonymous_union); 2692 else if (!Record->isUnion()) 2693 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2694 2695 // C and C++ require different kinds of checks for anonymous 2696 // structs/unions. 2697 bool Invalid = false; 2698 if (getLangOptions().CPlusPlus) { 2699 const char* PrevSpec = 0; 2700 unsigned DiagID; 2701 if (Record->isUnion()) { 2702 // C++ [class.union]p6: 2703 // Anonymous unions declared in a named namespace or in the 2704 // global namespace shall be declared static. 2705 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2706 (isa<TranslationUnitDecl>(Owner) || 2707 (isa<NamespaceDecl>(Owner) && 2708 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2709 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2710 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2711 2712 // Recover by adding 'static'. 2713 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2714 PrevSpec, DiagID); 2715 } 2716 // C++ [class.union]p6: 2717 // A storage class is not allowed in a declaration of an 2718 // anonymous union in a class scope. 2719 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2720 isa<RecordDecl>(Owner)) { 2721 Diag(DS.getStorageClassSpecLoc(), 2722 diag::err_anonymous_union_with_storage_spec) 2723 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2724 2725 // Recover by removing the storage specifier. 2726 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2727 SourceLocation(), 2728 PrevSpec, DiagID); 2729 } 2730 } 2731 2732 // Ignore const/volatile/restrict qualifiers. 2733 if (DS.getTypeQualifiers()) { 2734 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2735 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2736 << Record->isUnion() << 0 2737 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2738 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2739 Diag(DS.getVolatileSpecLoc(), 2740 diag::ext_anonymous_struct_union_qualified) 2741 << Record->isUnion() << 1 2742 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2743 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2744 Diag(DS.getRestrictSpecLoc(), 2745 diag::ext_anonymous_struct_union_qualified) 2746 << Record->isUnion() << 2 2747 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2748 2749 DS.ClearTypeQualifiers(); 2750 } 2751 2752 // C++ [class.union]p2: 2753 // The member-specification of an anonymous union shall only 2754 // define non-static data members. [Note: nested types and 2755 // functions cannot be declared within an anonymous union. ] 2756 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2757 MemEnd = Record->decls_end(); 2758 Mem != MemEnd; ++Mem) { 2759 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2760 // C++ [class.union]p3: 2761 // An anonymous union shall not have private or protected 2762 // members (clause 11). 2763 assert(FD->getAccess() != AS_none); 2764 if (FD->getAccess() != AS_public) { 2765 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2766 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2767 Invalid = true; 2768 } 2769 2770 // C++ [class.union]p1 2771 // An object of a class with a non-trivial constructor, a non-trivial 2772 // copy constructor, a non-trivial destructor, or a non-trivial copy 2773 // assignment operator cannot be a member of a union, nor can an 2774 // array of such objects. 2775 if (CheckNontrivialField(FD)) 2776 Invalid = true; 2777 } else if ((*Mem)->isImplicit()) { 2778 // Any implicit members are fine. 2779 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2780 // This is a type that showed up in an 2781 // elaborated-type-specifier inside the anonymous struct or 2782 // union, but which actually declares a type outside of the 2783 // anonymous struct or union. It's okay. 2784 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2785 if (!MemRecord->isAnonymousStructOrUnion() && 2786 MemRecord->getDeclName()) { 2787 // Visual C++ allows type definition in anonymous struct or union. 2788 if (getLangOptions().MicrosoftExt) 2789 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2790 << (int)Record->isUnion(); 2791 else { 2792 // This is a nested type declaration. 2793 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2794 << (int)Record->isUnion(); 2795 Invalid = true; 2796 } 2797 } 2798 } else if (isa<AccessSpecDecl>(*Mem)) { 2799 // Any access specifier is fine. 2800 } else { 2801 // We have something that isn't a non-static data 2802 // member. Complain about it. 2803 unsigned DK = diag::err_anonymous_record_bad_member; 2804 if (isa<TypeDecl>(*Mem)) 2805 DK = diag::err_anonymous_record_with_type; 2806 else if (isa<FunctionDecl>(*Mem)) 2807 DK = diag::err_anonymous_record_with_function; 2808 else if (isa<VarDecl>(*Mem)) 2809 DK = diag::err_anonymous_record_with_static; 2810 2811 // Visual C++ allows type definition in anonymous struct or union. 2812 if (getLangOptions().MicrosoftExt && 2813 DK == diag::err_anonymous_record_with_type) 2814 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2815 << (int)Record->isUnion(); 2816 else { 2817 Diag((*Mem)->getLocation(), DK) 2818 << (int)Record->isUnion(); 2819 Invalid = true; 2820 } 2821 } 2822 } 2823 } 2824 2825 if (!Record->isUnion() && !Owner->isRecord()) { 2826 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2827 << (int)getLangOptions().CPlusPlus; 2828 Invalid = true; 2829 } 2830 2831 // Mock up a declarator. 2832 Declarator Dc(DS, Declarator::MemberContext); 2833 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2834 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2835 2836 // Create a declaration for this anonymous struct/union. 2837 NamedDecl *Anon = 0; 2838 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2839 Anon = FieldDecl::Create(Context, OwningClass, 2840 DS.getSourceRange().getBegin(), 2841 Record->getLocation(), 2842 /*IdentifierInfo=*/0, 2843 Context.getTypeDeclType(Record), 2844 TInfo, 2845 /*BitWidth=*/0, /*Mutable=*/false, 2846 /*HasInit=*/false); 2847 Anon->setAccess(AS); 2848 if (getLangOptions().CPlusPlus) 2849 FieldCollector->Add(cast<FieldDecl>(Anon)); 2850 } else { 2851 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2852 assert(SCSpec != DeclSpec::SCS_typedef && 2853 "Parser allowed 'typedef' as storage class VarDecl."); 2854 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2855 if (SCSpec == DeclSpec::SCS_mutable) { 2856 // mutable can only appear on non-static class members, so it's always 2857 // an error here 2858 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2859 Invalid = true; 2860 SC = SC_None; 2861 } 2862 SCSpec = DS.getStorageClassSpecAsWritten(); 2863 VarDecl::StorageClass SCAsWritten 2864 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2865 2866 Anon = VarDecl::Create(Context, Owner, 2867 DS.getSourceRange().getBegin(), 2868 Record->getLocation(), /*IdentifierInfo=*/0, 2869 Context.getTypeDeclType(Record), 2870 TInfo, SC, SCAsWritten); 2871 2872 // Default-initialize the implicit variable. This initialization will be 2873 // trivial in almost all cases, except if a union member has an in-class 2874 // initializer: 2875 // union { int n = 0; }; 2876 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2877 } 2878 Anon->setImplicit(); 2879 2880 // Add the anonymous struct/union object to the current 2881 // context. We'll be referencing this object when we refer to one of 2882 // its members. 2883 Owner->addDecl(Anon); 2884 2885 // Inject the members of the anonymous struct/union into the owning 2886 // context and into the identifier resolver chain for name lookup 2887 // purposes. 2888 SmallVector<NamedDecl*, 2> Chain; 2889 Chain.push_back(Anon); 2890 2891 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2892 Chain, false)) 2893 Invalid = true; 2894 2895 // Mark this as an anonymous struct/union type. Note that we do not 2896 // do this until after we have already checked and injected the 2897 // members of this anonymous struct/union type, because otherwise 2898 // the members could be injected twice: once by DeclContext when it 2899 // builds its lookup table, and once by 2900 // InjectAnonymousStructOrUnionMembers. 2901 Record->setAnonymousStructOrUnion(true); 2902 2903 if (Invalid) 2904 Anon->setInvalidDecl(); 2905 2906 return Anon; 2907} 2908 2909/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2910/// Microsoft C anonymous structure. 2911/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2912/// Example: 2913/// 2914/// struct A { int a; }; 2915/// struct B { struct A; int b; }; 2916/// 2917/// void foo() { 2918/// B var; 2919/// var.a = 3; 2920/// } 2921/// 2922Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2923 RecordDecl *Record) { 2924 2925 // If there is no Record, get the record via the typedef. 2926 if (!Record) 2927 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2928 2929 // Mock up a declarator. 2930 Declarator Dc(DS, Declarator::TypeNameContext); 2931 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2932 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2933 2934 // Create a declaration for this anonymous struct. 2935 NamedDecl* Anon = FieldDecl::Create(Context, 2936 cast<RecordDecl>(CurContext), 2937 DS.getSourceRange().getBegin(), 2938 DS.getSourceRange().getBegin(), 2939 /*IdentifierInfo=*/0, 2940 Context.getTypeDeclType(Record), 2941 TInfo, 2942 /*BitWidth=*/0, /*Mutable=*/false, 2943 /*HasInit=*/false); 2944 Anon->setImplicit(); 2945 2946 // Add the anonymous struct object to the current context. 2947 CurContext->addDecl(Anon); 2948 2949 // Inject the members of the anonymous struct into the current 2950 // context and into the identifier resolver chain for name lookup 2951 // purposes. 2952 SmallVector<NamedDecl*, 2> Chain; 2953 Chain.push_back(Anon); 2954 2955 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2956 Record->getDefinition(), 2957 AS_none, Chain, true)) 2958 Anon->setInvalidDecl(); 2959 2960 return Anon; 2961} 2962 2963/// GetNameForDeclarator - Determine the full declaration name for the 2964/// given Declarator. 2965DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2966 return GetNameFromUnqualifiedId(D.getName()); 2967} 2968 2969/// \brief Retrieves the declaration name from a parsed unqualified-id. 2970DeclarationNameInfo 2971Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2972 DeclarationNameInfo NameInfo; 2973 NameInfo.setLoc(Name.StartLocation); 2974 2975 switch (Name.getKind()) { 2976 2977 case UnqualifiedId::IK_ImplicitSelfParam: 2978 case UnqualifiedId::IK_Identifier: 2979 NameInfo.setName(Name.Identifier); 2980 NameInfo.setLoc(Name.StartLocation); 2981 return NameInfo; 2982 2983 case UnqualifiedId::IK_OperatorFunctionId: 2984 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2985 Name.OperatorFunctionId.Operator)); 2986 NameInfo.setLoc(Name.StartLocation); 2987 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2988 = Name.OperatorFunctionId.SymbolLocations[0]; 2989 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2990 = Name.EndLocation.getRawEncoding(); 2991 return NameInfo; 2992 2993 case UnqualifiedId::IK_LiteralOperatorId: 2994 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2995 Name.Identifier)); 2996 NameInfo.setLoc(Name.StartLocation); 2997 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2998 return NameInfo; 2999 3000 case UnqualifiedId::IK_ConversionFunctionId: { 3001 TypeSourceInfo *TInfo; 3002 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3003 if (Ty.isNull()) 3004 return DeclarationNameInfo(); 3005 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3006 Context.getCanonicalType(Ty))); 3007 NameInfo.setLoc(Name.StartLocation); 3008 NameInfo.setNamedTypeInfo(TInfo); 3009 return NameInfo; 3010 } 3011 3012 case UnqualifiedId::IK_ConstructorName: { 3013 TypeSourceInfo *TInfo; 3014 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3015 if (Ty.isNull()) 3016 return DeclarationNameInfo(); 3017 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3018 Context.getCanonicalType(Ty))); 3019 NameInfo.setLoc(Name.StartLocation); 3020 NameInfo.setNamedTypeInfo(TInfo); 3021 return NameInfo; 3022 } 3023 3024 case UnqualifiedId::IK_ConstructorTemplateId: { 3025 // In well-formed code, we can only have a constructor 3026 // template-id that refers to the current context, so go there 3027 // to find the actual type being constructed. 3028 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3029 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3030 return DeclarationNameInfo(); 3031 3032 // Determine the type of the class being constructed. 3033 QualType CurClassType = Context.getTypeDeclType(CurClass); 3034 3035 // FIXME: Check two things: that the template-id names the same type as 3036 // CurClassType, and that the template-id does not occur when the name 3037 // was qualified. 3038 3039 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3040 Context.getCanonicalType(CurClassType))); 3041 NameInfo.setLoc(Name.StartLocation); 3042 // FIXME: should we retrieve TypeSourceInfo? 3043 NameInfo.setNamedTypeInfo(0); 3044 return NameInfo; 3045 } 3046 3047 case UnqualifiedId::IK_DestructorName: { 3048 TypeSourceInfo *TInfo; 3049 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3050 if (Ty.isNull()) 3051 return DeclarationNameInfo(); 3052 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3053 Context.getCanonicalType(Ty))); 3054 NameInfo.setLoc(Name.StartLocation); 3055 NameInfo.setNamedTypeInfo(TInfo); 3056 return NameInfo; 3057 } 3058 3059 case UnqualifiedId::IK_TemplateId: { 3060 TemplateName TName = Name.TemplateId->Template.get(); 3061 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3062 return Context.getNameForTemplate(TName, TNameLoc); 3063 } 3064 3065 } // switch (Name.getKind()) 3066 3067 llvm_unreachable("Unknown name kind"); 3068} 3069 3070static QualType getCoreType(QualType Ty) { 3071 do { 3072 if (Ty->isPointerType() || Ty->isReferenceType()) 3073 Ty = Ty->getPointeeType(); 3074 else if (Ty->isArrayType()) 3075 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3076 else 3077 return Ty.withoutLocalFastQualifiers(); 3078 } while (true); 3079} 3080 3081/// hasSimilarParameters - Determine whether the C++ functions Declaration 3082/// and Definition have "nearly" matching parameters. This heuristic is 3083/// used to improve diagnostics in the case where an out-of-line function 3084/// definition doesn't match any declaration within the class or namespace. 3085/// Also sets Params to the list of indices to the parameters that differ 3086/// between the declaration and the definition. If hasSimilarParameters 3087/// returns true and Params is empty, then all of the parameters match. 3088static bool hasSimilarParameters(ASTContext &Context, 3089 FunctionDecl *Declaration, 3090 FunctionDecl *Definition, 3091 llvm::SmallVectorImpl<unsigned> &Params) { 3092 Params.clear(); 3093 if (Declaration->param_size() != Definition->param_size()) 3094 return false; 3095 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3096 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3097 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3098 3099 // The parameter types are identical 3100 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3101 continue; 3102 3103 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3104 QualType DefParamBaseTy = getCoreType(DefParamTy); 3105 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3106 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3107 3108 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3109 (DeclTyName && DeclTyName == DefTyName)) 3110 Params.push_back(Idx); 3111 else // The two parameters aren't even close 3112 return false; 3113 } 3114 3115 return true; 3116} 3117 3118/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3119/// declarator needs to be rebuilt in the current instantiation. 3120/// Any bits of declarator which appear before the name are valid for 3121/// consideration here. That's specifically the type in the decl spec 3122/// and the base type in any member-pointer chunks. 3123static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3124 DeclarationName Name) { 3125 // The types we specifically need to rebuild are: 3126 // - typenames, typeofs, and decltypes 3127 // - types which will become injected class names 3128 // Of course, we also need to rebuild any type referencing such a 3129 // type. It's safest to just say "dependent", but we call out a 3130 // few cases here. 3131 3132 DeclSpec &DS = D.getMutableDeclSpec(); 3133 switch (DS.getTypeSpecType()) { 3134 case DeclSpec::TST_typename: 3135 case DeclSpec::TST_typeofType: 3136 case DeclSpec::TST_decltype: 3137 case DeclSpec::TST_underlyingType: 3138 case DeclSpec::TST_atomic: { 3139 // Grab the type from the parser. 3140 TypeSourceInfo *TSI = 0; 3141 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3142 if (T.isNull() || !T->isDependentType()) break; 3143 3144 // Make sure there's a type source info. This isn't really much 3145 // of a waste; most dependent types should have type source info 3146 // attached already. 3147 if (!TSI) 3148 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3149 3150 // Rebuild the type in the current instantiation. 3151 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3152 if (!TSI) return true; 3153 3154 // Store the new type back in the decl spec. 3155 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3156 DS.UpdateTypeRep(LocType); 3157 break; 3158 } 3159 3160 case DeclSpec::TST_typeofExpr: { 3161 Expr *E = DS.getRepAsExpr(); 3162 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3163 if (Result.isInvalid()) return true; 3164 DS.UpdateExprRep(Result.get()); 3165 break; 3166 } 3167 3168 default: 3169 // Nothing to do for these decl specs. 3170 break; 3171 } 3172 3173 // It doesn't matter what order we do this in. 3174 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3175 DeclaratorChunk &Chunk = D.getTypeObject(I); 3176 3177 // The only type information in the declarator which can come 3178 // before the declaration name is the base type of a member 3179 // pointer. 3180 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3181 continue; 3182 3183 // Rebuild the scope specifier in-place. 3184 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3185 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3186 return true; 3187 } 3188 3189 return false; 3190} 3191 3192Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3193 D.setFunctionDefinitionKind(FDK_Declaration); 3194 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3195 3196 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3197 Dcl->getDeclContext()->isFileContext()) 3198 Dcl->setTopLevelDeclInObjCContainer(); 3199 3200 return Dcl; 3201} 3202 3203/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3204/// If T is the name of a class, then each of the following shall have a 3205/// name different from T: 3206/// - every static data member of class T; 3207/// - every member function of class T 3208/// - every member of class T that is itself a type; 3209/// \returns true if the declaration name violates these rules. 3210bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3211 DeclarationNameInfo NameInfo) { 3212 DeclarationName Name = NameInfo.getName(); 3213 3214 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3215 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3216 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3217 return true; 3218 } 3219 3220 return false; 3221} 3222 3223Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3224 MultiTemplateParamsArg TemplateParamLists) { 3225 // TODO: consider using NameInfo for diagnostic. 3226 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3227 DeclarationName Name = NameInfo.getName(); 3228 3229 // All of these full declarators require an identifier. If it doesn't have 3230 // one, the ParsedFreeStandingDeclSpec action should be used. 3231 if (!Name) { 3232 if (!D.isInvalidType()) // Reject this if we think it is valid. 3233 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3234 diag::err_declarator_need_ident) 3235 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3236 return 0; 3237 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3238 return 0; 3239 3240 // The scope passed in may not be a decl scope. Zip up the scope tree until 3241 // we find one that is. 3242 while ((S->getFlags() & Scope::DeclScope) == 0 || 3243 (S->getFlags() & Scope::TemplateParamScope) != 0) 3244 S = S->getParent(); 3245 3246 DeclContext *DC = CurContext; 3247 if (D.getCXXScopeSpec().isInvalid()) 3248 D.setInvalidType(); 3249 else if (D.getCXXScopeSpec().isSet()) { 3250 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3251 UPPC_DeclarationQualifier)) 3252 return 0; 3253 3254 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3255 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3256 if (!DC) { 3257 // If we could not compute the declaration context, it's because the 3258 // declaration context is dependent but does not refer to a class, 3259 // class template, or class template partial specialization. Complain 3260 // and return early, to avoid the coming semantic disaster. 3261 Diag(D.getIdentifierLoc(), 3262 diag::err_template_qualified_declarator_no_match) 3263 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3264 << D.getCXXScopeSpec().getRange(); 3265 return 0; 3266 } 3267 bool IsDependentContext = DC->isDependentContext(); 3268 3269 if (!IsDependentContext && 3270 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3271 return 0; 3272 3273 if (isa<CXXRecordDecl>(DC)) { 3274 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3275 Diag(D.getIdentifierLoc(), 3276 diag::err_member_def_undefined_record) 3277 << Name << DC << D.getCXXScopeSpec().getRange(); 3278 D.setInvalidType(); 3279 } else if (isa<CXXRecordDecl>(CurContext) && 3280 !D.getDeclSpec().isFriendSpecified()) { 3281 // The user provided a superfluous scope specifier inside a class 3282 // definition: 3283 // 3284 // class X { 3285 // void X::f(); 3286 // }; 3287 if (CurContext->Equals(DC)) { 3288 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3289 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3290 } else { 3291 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3292 << Name << D.getCXXScopeSpec().getRange(); 3293 3294 // C++ constructors and destructors with incorrect scopes can break 3295 // our AST invariants by having the wrong underlying types. If 3296 // that's the case, then drop this declaration entirely. 3297 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3298 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3299 !Context.hasSameType(Name.getCXXNameType(), 3300 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3301 return 0; 3302 } 3303 3304 // Pretend that this qualifier was not here. 3305 D.getCXXScopeSpec().clear(); 3306 } 3307 } 3308 3309 // Check whether we need to rebuild the type of the given 3310 // declaration in the current instantiation. 3311 if (EnteringContext && IsDependentContext && 3312 TemplateParamLists.size() != 0) { 3313 ContextRAII SavedContext(*this, DC); 3314 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3315 D.setInvalidType(); 3316 } 3317 } 3318 3319 if (DiagnoseClassNameShadow(DC, NameInfo)) 3320 // If this is a typedef, we'll end up spewing multiple diagnostics. 3321 // Just return early; it's safer. 3322 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3323 return 0; 3324 3325 NamedDecl *New; 3326 3327 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3328 QualType R = TInfo->getType(); 3329 3330 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3331 UPPC_DeclarationType)) 3332 D.setInvalidType(); 3333 3334 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3335 ForRedeclaration); 3336 3337 // See if this is a redefinition of a variable in the same scope. 3338 if (!D.getCXXScopeSpec().isSet()) { 3339 bool IsLinkageLookup = false; 3340 3341 // If the declaration we're planning to build will be a function 3342 // or object with linkage, then look for another declaration with 3343 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3344 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3345 /* Do nothing*/; 3346 else if (R->isFunctionType()) { 3347 if (CurContext->isFunctionOrMethod() || 3348 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3349 IsLinkageLookup = true; 3350 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3351 IsLinkageLookup = true; 3352 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3353 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3354 IsLinkageLookup = true; 3355 3356 if (IsLinkageLookup) 3357 Previous.clear(LookupRedeclarationWithLinkage); 3358 3359 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3360 } else { // Something like "int foo::x;" 3361 LookupQualifiedName(Previous, DC); 3362 3363 // Don't consider using declarations as previous declarations for 3364 // out-of-line members. 3365 RemoveUsingDecls(Previous); 3366 3367 // C++ 7.3.1.2p2: 3368 // Members (including explicit specializations of templates) of a named 3369 // namespace can also be defined outside that namespace by explicit 3370 // qualification of the name being defined, provided that the entity being 3371 // defined was already declared in the namespace and the definition appears 3372 // after the point of declaration in a namespace that encloses the 3373 // declarations namespace. 3374 // 3375 // Note that we only check the context at this point. We don't yet 3376 // have enough information to make sure that PrevDecl is actually 3377 // the declaration we want to match. For example, given: 3378 // 3379 // class X { 3380 // void f(); 3381 // void f(float); 3382 // }; 3383 // 3384 // void X::f(int) { } // ill-formed 3385 // 3386 // In this case, PrevDecl will point to the overload set 3387 // containing the two f's declared in X, but neither of them 3388 // matches. 3389 3390 // First check whether we named the global scope. 3391 if (isa<TranslationUnitDecl>(DC)) { 3392 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3393 << Name << D.getCXXScopeSpec().getRange(); 3394 } else { 3395 DeclContext *Cur = CurContext; 3396 while (isa<LinkageSpecDecl>(Cur)) 3397 Cur = Cur->getParent(); 3398 if (!Cur->Encloses(DC)) { 3399 // The qualifying scope doesn't enclose the original declaration. 3400 // Emit diagnostic based on current scope. 3401 SourceLocation L = D.getIdentifierLoc(); 3402 SourceRange R = D.getCXXScopeSpec().getRange(); 3403 if (isa<FunctionDecl>(Cur)) 3404 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3405 else 3406 Diag(L, diag::err_invalid_declarator_scope) 3407 << Name << cast<NamedDecl>(DC) << R; 3408 D.setInvalidType(); 3409 } 3410 3411 // C++11 8.3p1: 3412 // ... "The nested-name-specifier of the qualified declarator-id shall 3413 // not begin with a decltype-specifer" 3414 NestedNameSpecifierLoc SpecLoc = 3415 D.getCXXScopeSpec().getWithLocInContext(Context); 3416 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3417 "NestedNameSpecifierLoc"); 3418 while (SpecLoc.getPrefix()) 3419 SpecLoc = SpecLoc.getPrefix(); 3420 if (dyn_cast_or_null<DecltypeType>( 3421 SpecLoc.getNestedNameSpecifier()->getAsType())) 3422 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3423 << SpecLoc.getTypeLoc().getSourceRange(); 3424 } 3425 } 3426 3427 if (Previous.isSingleResult() && 3428 Previous.getFoundDecl()->isTemplateParameter()) { 3429 // Maybe we will complain about the shadowed template parameter. 3430 if (!D.isInvalidType()) 3431 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3432 Previous.getFoundDecl()); 3433 3434 // Just pretend that we didn't see the previous declaration. 3435 Previous.clear(); 3436 } 3437 3438 // In C++, the previous declaration we find might be a tag type 3439 // (class or enum). In this case, the new declaration will hide the 3440 // tag type. Note that this does does not apply if we're declaring a 3441 // typedef (C++ [dcl.typedef]p4). 3442 if (Previous.isSingleTagDecl() && 3443 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3444 Previous.clear(); 3445 3446 bool AddToScope = true; 3447 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3448 if (TemplateParamLists.size()) { 3449 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3450 return 0; 3451 } 3452 3453 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3454 } else if (R->isFunctionType()) { 3455 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3456 move(TemplateParamLists), 3457 AddToScope); 3458 } else { 3459 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3460 move(TemplateParamLists)); 3461 } 3462 3463 if (New == 0) 3464 return 0; 3465 3466 // If this has an identifier and is not an invalid redeclaration or 3467 // function template specialization, add it to the scope stack. 3468 if (New->getDeclName() && AddToScope && 3469 !(D.isRedeclaration() && New->isInvalidDecl())) 3470 PushOnScopeChains(New, S); 3471 3472 return New; 3473} 3474 3475/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3476/// types into constant array types in certain situations which would otherwise 3477/// be errors (for GCC compatibility). 3478static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3479 ASTContext &Context, 3480 bool &SizeIsNegative, 3481 llvm::APSInt &Oversized) { 3482 // This method tries to turn a variable array into a constant 3483 // array even when the size isn't an ICE. This is necessary 3484 // for compatibility with code that depends on gcc's buggy 3485 // constant expression folding, like struct {char x[(int)(char*)2];} 3486 SizeIsNegative = false; 3487 Oversized = 0; 3488 3489 if (T->isDependentType()) 3490 return QualType(); 3491 3492 QualifierCollector Qs; 3493 const Type *Ty = Qs.strip(T); 3494 3495 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3496 QualType Pointee = PTy->getPointeeType(); 3497 QualType FixedType = 3498 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3499 Oversized); 3500 if (FixedType.isNull()) return FixedType; 3501 FixedType = Context.getPointerType(FixedType); 3502 return Qs.apply(Context, FixedType); 3503 } 3504 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3505 QualType Inner = PTy->getInnerType(); 3506 QualType FixedType = 3507 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3508 Oversized); 3509 if (FixedType.isNull()) return FixedType; 3510 FixedType = Context.getParenType(FixedType); 3511 return Qs.apply(Context, FixedType); 3512 } 3513 3514 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3515 if (!VLATy) 3516 return QualType(); 3517 // FIXME: We should probably handle this case 3518 if (VLATy->getElementType()->isVariablyModifiedType()) 3519 return QualType(); 3520 3521 llvm::APSInt Res; 3522 if (!VLATy->getSizeExpr() || 3523 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3524 return QualType(); 3525 3526 // Check whether the array size is negative. 3527 if (Res.isSigned() && Res.isNegative()) { 3528 SizeIsNegative = true; 3529 return QualType(); 3530 } 3531 3532 // Check whether the array is too large to be addressed. 3533 unsigned ActiveSizeBits 3534 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3535 Res); 3536 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3537 Oversized = Res; 3538 return QualType(); 3539 } 3540 3541 return Context.getConstantArrayType(VLATy->getElementType(), 3542 Res, ArrayType::Normal, 0); 3543} 3544 3545/// \brief Register the given locally-scoped external C declaration so 3546/// that it can be found later for redeclarations 3547void 3548Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3549 const LookupResult &Previous, 3550 Scope *S) { 3551 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3552 "Decl is not a locally-scoped decl!"); 3553 // Note that we have a locally-scoped external with this name. 3554 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3555 3556 if (!Previous.isSingleResult()) 3557 return; 3558 3559 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3560 3561 // If there was a previous declaration of this variable, it may be 3562 // in our identifier chain. Update the identifier chain with the new 3563 // declaration. 3564 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3565 // The previous declaration was found on the identifer resolver 3566 // chain, so remove it from its scope. 3567 3568 if (S->isDeclScope(PrevDecl)) { 3569 // Special case for redeclarations in the SAME scope. 3570 // Because this declaration is going to be added to the identifier chain 3571 // later, we should temporarily take it OFF the chain. 3572 IdResolver.RemoveDecl(ND); 3573 3574 } else { 3575 // Find the scope for the original declaration. 3576 while (S && !S->isDeclScope(PrevDecl)) 3577 S = S->getParent(); 3578 } 3579 3580 if (S) 3581 S->RemoveDecl(PrevDecl); 3582 } 3583} 3584 3585llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3586Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3587 if (ExternalSource) { 3588 // Load locally-scoped external decls from the external source. 3589 SmallVector<NamedDecl *, 4> Decls; 3590 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3591 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3592 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3593 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3594 if (Pos == LocallyScopedExternalDecls.end()) 3595 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3596 } 3597 } 3598 3599 return LocallyScopedExternalDecls.find(Name); 3600} 3601 3602/// \brief Diagnose function specifiers on a declaration of an identifier that 3603/// does not identify a function. 3604void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3605 // FIXME: We should probably indicate the identifier in question to avoid 3606 // confusion for constructs like "inline int a(), b;" 3607 if (D.getDeclSpec().isInlineSpecified()) 3608 Diag(D.getDeclSpec().getInlineSpecLoc(), 3609 diag::err_inline_non_function); 3610 3611 if (D.getDeclSpec().isVirtualSpecified()) 3612 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3613 diag::err_virtual_non_function); 3614 3615 if (D.getDeclSpec().isExplicitSpecified()) 3616 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3617 diag::err_explicit_non_function); 3618} 3619 3620NamedDecl* 3621Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3622 TypeSourceInfo *TInfo, LookupResult &Previous) { 3623 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3624 if (D.getCXXScopeSpec().isSet()) { 3625 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3626 << D.getCXXScopeSpec().getRange(); 3627 D.setInvalidType(); 3628 // Pretend we didn't see the scope specifier. 3629 DC = CurContext; 3630 Previous.clear(); 3631 } 3632 3633 if (getLangOptions().CPlusPlus) { 3634 // Check that there are no default arguments (C++ only). 3635 CheckExtraCXXDefaultArguments(D); 3636 } 3637 3638 DiagnoseFunctionSpecifiers(D); 3639 3640 if (D.getDeclSpec().isThreadSpecified()) 3641 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3642 if (D.getDeclSpec().isConstexprSpecified()) 3643 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3644 << 1; 3645 3646 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3647 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3648 << D.getName().getSourceRange(); 3649 return 0; 3650 } 3651 3652 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3653 if (!NewTD) return 0; 3654 3655 // Handle attributes prior to checking for duplicates in MergeVarDecl 3656 ProcessDeclAttributes(S, NewTD, D); 3657 3658 CheckTypedefForVariablyModifiedType(S, NewTD); 3659 3660 bool Redeclaration = D.isRedeclaration(); 3661 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3662 D.setRedeclaration(Redeclaration); 3663 return ND; 3664} 3665 3666void 3667Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3668 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3669 // then it shall have block scope. 3670 // Note that variably modified types must be fixed before merging the decl so 3671 // that redeclarations will match. 3672 QualType T = NewTD->getUnderlyingType(); 3673 if (T->isVariablyModifiedType()) { 3674 getCurFunction()->setHasBranchProtectedScope(); 3675 3676 if (S->getFnParent() == 0) { 3677 bool SizeIsNegative; 3678 llvm::APSInt Oversized; 3679 QualType FixedTy = 3680 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3681 Oversized); 3682 if (!FixedTy.isNull()) { 3683 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3684 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3685 } else { 3686 if (SizeIsNegative) 3687 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3688 else if (T->isVariableArrayType()) 3689 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3690 else if (Oversized.getBoolValue()) 3691 Diag(NewTD->getLocation(), diag::err_array_too_large) 3692 << Oversized.toString(10); 3693 else 3694 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3695 NewTD->setInvalidDecl(); 3696 } 3697 } 3698 } 3699} 3700 3701 3702/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3703/// declares a typedef-name, either using the 'typedef' type specifier or via 3704/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3705NamedDecl* 3706Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3707 LookupResult &Previous, bool &Redeclaration) { 3708 // Merge the decl with the existing one if appropriate. If the decl is 3709 // in an outer scope, it isn't the same thing. 3710 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3711 /*ExplicitInstantiationOrSpecialization=*/false); 3712 if (!Previous.empty()) { 3713 Redeclaration = true; 3714 MergeTypedefNameDecl(NewTD, Previous); 3715 } 3716 3717 // If this is the C FILE type, notify the AST context. 3718 if (IdentifierInfo *II = NewTD->getIdentifier()) 3719 if (!NewTD->isInvalidDecl() && 3720 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3721 if (II->isStr("FILE")) 3722 Context.setFILEDecl(NewTD); 3723 else if (II->isStr("jmp_buf")) 3724 Context.setjmp_bufDecl(NewTD); 3725 else if (II->isStr("sigjmp_buf")) 3726 Context.setsigjmp_bufDecl(NewTD); 3727 else if (II->isStr("ucontext_t")) 3728 Context.setucontext_tDecl(NewTD); 3729 else if (II->isStr("__builtin_va_list")) 3730 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3731 } 3732 3733 return NewTD; 3734} 3735 3736/// \brief Determines whether the given declaration is an out-of-scope 3737/// previous declaration. 3738/// 3739/// This routine should be invoked when name lookup has found a 3740/// previous declaration (PrevDecl) that is not in the scope where a 3741/// new declaration by the same name is being introduced. If the new 3742/// declaration occurs in a local scope, previous declarations with 3743/// linkage may still be considered previous declarations (C99 3744/// 6.2.2p4-5, C++ [basic.link]p6). 3745/// 3746/// \param PrevDecl the previous declaration found by name 3747/// lookup 3748/// 3749/// \param DC the context in which the new declaration is being 3750/// declared. 3751/// 3752/// \returns true if PrevDecl is an out-of-scope previous declaration 3753/// for a new delcaration with the same name. 3754static bool 3755isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3756 ASTContext &Context) { 3757 if (!PrevDecl) 3758 return false; 3759 3760 if (!PrevDecl->hasLinkage()) 3761 return false; 3762 3763 if (Context.getLangOptions().CPlusPlus) { 3764 // C++ [basic.link]p6: 3765 // If there is a visible declaration of an entity with linkage 3766 // having the same name and type, ignoring entities declared 3767 // outside the innermost enclosing namespace scope, the block 3768 // scope declaration declares that same entity and receives the 3769 // linkage of the previous declaration. 3770 DeclContext *OuterContext = DC->getRedeclContext(); 3771 if (!OuterContext->isFunctionOrMethod()) 3772 // This rule only applies to block-scope declarations. 3773 return false; 3774 3775 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3776 if (PrevOuterContext->isRecord()) 3777 // We found a member function: ignore it. 3778 return false; 3779 3780 // Find the innermost enclosing namespace for the new and 3781 // previous declarations. 3782 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3783 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3784 3785 // The previous declaration is in a different namespace, so it 3786 // isn't the same function. 3787 if (!OuterContext->Equals(PrevOuterContext)) 3788 return false; 3789 } 3790 3791 return true; 3792} 3793 3794static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3795 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3796 if (!SS.isSet()) return; 3797 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3798} 3799 3800bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3801 QualType type = decl->getType(); 3802 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3803 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3804 // Various kinds of declaration aren't allowed to be __autoreleasing. 3805 unsigned kind = -1U; 3806 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3807 if (var->hasAttr<BlocksAttr>()) 3808 kind = 0; // __block 3809 else if (!var->hasLocalStorage()) 3810 kind = 1; // global 3811 } else if (isa<ObjCIvarDecl>(decl)) { 3812 kind = 3; // ivar 3813 } else if (isa<FieldDecl>(decl)) { 3814 kind = 2; // field 3815 } 3816 3817 if (kind != -1U) { 3818 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3819 << kind; 3820 } 3821 } else if (lifetime == Qualifiers::OCL_None) { 3822 // Try to infer lifetime. 3823 if (!type->isObjCLifetimeType()) 3824 return false; 3825 3826 lifetime = type->getObjCARCImplicitLifetime(); 3827 type = Context.getLifetimeQualifiedType(type, lifetime); 3828 decl->setType(type); 3829 } 3830 3831 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3832 // Thread-local variables cannot have lifetime. 3833 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3834 var->isThreadSpecified()) { 3835 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3836 << var->getType(); 3837 return true; 3838 } 3839 } 3840 3841 return false; 3842} 3843 3844NamedDecl* 3845Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3846 TypeSourceInfo *TInfo, LookupResult &Previous, 3847 MultiTemplateParamsArg TemplateParamLists) { 3848 QualType R = TInfo->getType(); 3849 DeclarationName Name = GetNameForDeclarator(D).getName(); 3850 3851 // Check that there are no default arguments (C++ only). 3852 if (getLangOptions().CPlusPlus) 3853 CheckExtraCXXDefaultArguments(D); 3854 3855 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3856 assert(SCSpec != DeclSpec::SCS_typedef && 3857 "Parser allowed 'typedef' as storage class VarDecl."); 3858 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3859 if (SCSpec == DeclSpec::SCS_mutable) { 3860 // mutable can only appear on non-static class members, so it's always 3861 // an error here 3862 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3863 D.setInvalidType(); 3864 SC = SC_None; 3865 } 3866 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3867 VarDecl::StorageClass SCAsWritten 3868 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3869 3870 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3871 if (!II) { 3872 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3873 << Name; 3874 return 0; 3875 } 3876 3877 DiagnoseFunctionSpecifiers(D); 3878 3879 if (!DC->isRecord() && S->getFnParent() == 0) { 3880 // C99 6.9p2: The storage-class specifiers auto and register shall not 3881 // appear in the declaration specifiers in an external declaration. 3882 if (SC == SC_Auto || SC == SC_Register) { 3883 3884 // If this is a register variable with an asm label specified, then this 3885 // is a GNU extension. 3886 if (SC == SC_Register && D.getAsmLabel()) 3887 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3888 else 3889 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3890 D.setInvalidType(); 3891 } 3892 } 3893 3894 if (getLangOptions().OpenCL) { 3895 // Set up the special work-group-local storage class for variables in the 3896 // OpenCL __local address space. 3897 if (R.getAddressSpace() == LangAS::opencl_local) 3898 SC = SC_OpenCLWorkGroupLocal; 3899 } 3900 3901 bool isExplicitSpecialization = false; 3902 VarDecl *NewVD; 3903 if (!getLangOptions().CPlusPlus) { 3904 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3905 D.getIdentifierLoc(), II, 3906 R, TInfo, SC, SCAsWritten); 3907 3908 if (D.isInvalidType()) 3909 NewVD->setInvalidDecl(); 3910 } else { 3911 if (DC->isRecord() && !CurContext->isRecord()) { 3912 // This is an out-of-line definition of a static data member. 3913 if (SC == SC_Static) { 3914 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3915 diag::err_static_out_of_line) 3916 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3917 } else if (SC == SC_None) 3918 SC = SC_Static; 3919 } 3920 if (SC == SC_Static) { 3921 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3922 if (RD->isLocalClass()) 3923 Diag(D.getIdentifierLoc(), 3924 diag::err_static_data_member_not_allowed_in_local_class) 3925 << Name << RD->getDeclName(); 3926 3927 // C++ [class.union]p1: If a union contains a static data member, 3928 // the program is ill-formed. 3929 // 3930 // We also disallow static data members in anonymous structs. 3931 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3932 Diag(D.getIdentifierLoc(), 3933 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3934 << Name << RD->isUnion(); 3935 } 3936 } 3937 3938 // Match up the template parameter lists with the scope specifier, then 3939 // determine whether we have a template or a template specialization. 3940 isExplicitSpecialization = false; 3941 bool Invalid = false; 3942 if (TemplateParameterList *TemplateParams 3943 = MatchTemplateParametersToScopeSpecifier( 3944 D.getDeclSpec().getSourceRange().getBegin(), 3945 D.getIdentifierLoc(), 3946 D.getCXXScopeSpec(), 3947 TemplateParamLists.get(), 3948 TemplateParamLists.size(), 3949 /*never a friend*/ false, 3950 isExplicitSpecialization, 3951 Invalid)) { 3952 if (TemplateParams->size() > 0) { 3953 // There is no such thing as a variable template. 3954 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3955 << II 3956 << SourceRange(TemplateParams->getTemplateLoc(), 3957 TemplateParams->getRAngleLoc()); 3958 return 0; 3959 } else { 3960 // There is an extraneous 'template<>' for this variable. Complain 3961 // about it, but allow the declaration of the variable. 3962 Diag(TemplateParams->getTemplateLoc(), 3963 diag::err_template_variable_noparams) 3964 << II 3965 << SourceRange(TemplateParams->getTemplateLoc(), 3966 TemplateParams->getRAngleLoc()); 3967 } 3968 } 3969 3970 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3971 D.getIdentifierLoc(), II, 3972 R, TInfo, SC, SCAsWritten); 3973 3974 // If this decl has an auto type in need of deduction, make a note of the 3975 // Decl so we can diagnose uses of it in its own initializer. 3976 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3977 R->getContainedAutoType()) 3978 ParsingInitForAutoVars.insert(NewVD); 3979 3980 if (D.isInvalidType() || Invalid) 3981 NewVD->setInvalidDecl(); 3982 3983 SetNestedNameSpecifier(NewVD, D); 3984 3985 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3986 NewVD->setTemplateParameterListsInfo(Context, 3987 TemplateParamLists.size(), 3988 TemplateParamLists.release()); 3989 } 3990 3991 if (D.getDeclSpec().isConstexprSpecified()) 3992 NewVD->setConstexpr(true); 3993 } 3994 3995 // Set the lexical context. If the declarator has a C++ scope specifier, the 3996 // lexical context will be different from the semantic context. 3997 NewVD->setLexicalDeclContext(CurContext); 3998 3999 if (D.getDeclSpec().isThreadSpecified()) { 4000 if (NewVD->hasLocalStorage()) 4001 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4002 else if (!Context.getTargetInfo().isTLSSupported()) 4003 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4004 else 4005 NewVD->setThreadSpecified(true); 4006 } 4007 4008 if (D.getDeclSpec().isModulePrivateSpecified()) { 4009 if (isExplicitSpecialization) 4010 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4011 << 2 4012 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4013 else if (NewVD->hasLocalStorage()) 4014 Diag(NewVD->getLocation(), diag::err_module_private_local) 4015 << 0 << NewVD->getDeclName() 4016 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4017 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4018 else 4019 NewVD->setModulePrivate(); 4020 } 4021 4022 // Handle attributes prior to checking for duplicates in MergeVarDecl 4023 ProcessDeclAttributes(S, NewVD, D); 4024 4025 // In auto-retain/release, infer strong retension for variables of 4026 // retainable type. 4027 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4028 NewVD->setInvalidDecl(); 4029 4030 // Handle GNU asm-label extension (encoded as an attribute). 4031 if (Expr *E = (Expr*)D.getAsmLabel()) { 4032 // The parser guarantees this is a string. 4033 StringLiteral *SE = cast<StringLiteral>(E); 4034 StringRef Label = SE->getString(); 4035 if (S->getFnParent() != 0) { 4036 switch (SC) { 4037 case SC_None: 4038 case SC_Auto: 4039 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4040 break; 4041 case SC_Register: 4042 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4043 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4044 break; 4045 case SC_Static: 4046 case SC_Extern: 4047 case SC_PrivateExtern: 4048 case SC_OpenCLWorkGroupLocal: 4049 break; 4050 } 4051 } 4052 4053 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4054 Context, Label)); 4055 } 4056 4057 // Diagnose shadowed variables before filtering for scope. 4058 if (!D.getCXXScopeSpec().isSet()) 4059 CheckShadow(S, NewVD, Previous); 4060 4061 // Don't consider existing declarations that are in a different 4062 // scope and are out-of-semantic-context declarations (if the new 4063 // declaration has linkage). 4064 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4065 isExplicitSpecialization); 4066 4067 if (!getLangOptions().CPlusPlus) { 4068 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4069 } else { 4070 // Merge the decl with the existing one if appropriate. 4071 if (!Previous.empty()) { 4072 if (Previous.isSingleResult() && 4073 isa<FieldDecl>(Previous.getFoundDecl()) && 4074 D.getCXXScopeSpec().isSet()) { 4075 // The user tried to define a non-static data member 4076 // out-of-line (C++ [dcl.meaning]p1). 4077 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4078 << D.getCXXScopeSpec().getRange(); 4079 Previous.clear(); 4080 NewVD->setInvalidDecl(); 4081 } 4082 } else if (D.getCXXScopeSpec().isSet()) { 4083 // No previous declaration in the qualifying scope. 4084 Diag(D.getIdentifierLoc(), diag::err_no_member) 4085 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4086 << D.getCXXScopeSpec().getRange(); 4087 NewVD->setInvalidDecl(); 4088 } 4089 4090 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4091 4092 // This is an explicit specialization of a static data member. Check it. 4093 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4094 CheckMemberSpecialization(NewVD, Previous)) 4095 NewVD->setInvalidDecl(); 4096 } 4097 4098 // attributes declared post-definition are currently ignored 4099 // FIXME: This should be handled in attribute merging, not 4100 // here. 4101 if (Previous.isSingleResult()) { 4102 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4103 if (Def && (Def = Def->getDefinition()) && 4104 Def != NewVD && D.hasAttributes()) { 4105 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4106 Diag(Def->getLocation(), diag::note_previous_definition); 4107 } 4108 } 4109 4110 // If this is a locally-scoped extern C variable, update the map of 4111 // such variables. 4112 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4113 !NewVD->isInvalidDecl()) 4114 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4115 4116 // If there's a #pragma GCC visibility in scope, and this isn't a class 4117 // member, set the visibility of this variable. 4118 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4119 AddPushedVisibilityAttribute(NewVD); 4120 4121 MarkUnusedFileScopedDecl(NewVD); 4122 4123 return NewVD; 4124} 4125 4126/// \brief Diagnose variable or built-in function shadowing. Implements 4127/// -Wshadow. 4128/// 4129/// This method is called whenever a VarDecl is added to a "useful" 4130/// scope. 4131/// 4132/// \param S the scope in which the shadowing name is being declared 4133/// \param R the lookup of the name 4134/// 4135void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4136 // Return if warning is ignored. 4137 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4138 DiagnosticsEngine::Ignored) 4139 return; 4140 4141 // Don't diagnose declarations at file scope. 4142 if (D->hasGlobalStorage()) 4143 return; 4144 4145 DeclContext *NewDC = D->getDeclContext(); 4146 4147 // Only diagnose if we're shadowing an unambiguous field or variable. 4148 if (R.getResultKind() != LookupResult::Found) 4149 return; 4150 4151 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4152 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4153 return; 4154 4155 // Fields are not shadowed by variables in C++ static methods. 4156 if (isa<FieldDecl>(ShadowedDecl)) 4157 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4158 if (MD->isStatic()) 4159 return; 4160 4161 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4162 if (shadowedVar->isExternC()) { 4163 // For shadowing external vars, make sure that we point to the global 4164 // declaration, not a locally scoped extern declaration. 4165 for (VarDecl::redecl_iterator 4166 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4167 I != E; ++I) 4168 if (I->isFileVarDecl()) { 4169 ShadowedDecl = *I; 4170 break; 4171 } 4172 } 4173 4174 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4175 4176 // Only warn about certain kinds of shadowing for class members. 4177 if (NewDC && NewDC->isRecord()) { 4178 // In particular, don't warn about shadowing non-class members. 4179 if (!OldDC->isRecord()) 4180 return; 4181 4182 // TODO: should we warn about static data members shadowing 4183 // static data members from base classes? 4184 4185 // TODO: don't diagnose for inaccessible shadowed members. 4186 // This is hard to do perfectly because we might friend the 4187 // shadowing context, but that's just a false negative. 4188 } 4189 4190 // Determine what kind of declaration we're shadowing. 4191 unsigned Kind; 4192 if (isa<RecordDecl>(OldDC)) { 4193 if (isa<FieldDecl>(ShadowedDecl)) 4194 Kind = 3; // field 4195 else 4196 Kind = 2; // static data member 4197 } else if (OldDC->isFileContext()) 4198 Kind = 1; // global 4199 else 4200 Kind = 0; // local 4201 4202 DeclarationName Name = R.getLookupName(); 4203 4204 // Emit warning and note. 4205 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4206 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4207} 4208 4209/// \brief Check -Wshadow without the advantage of a previous lookup. 4210void Sema::CheckShadow(Scope *S, VarDecl *D) { 4211 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4212 DiagnosticsEngine::Ignored) 4213 return; 4214 4215 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4216 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4217 LookupName(R, S); 4218 CheckShadow(S, D, R); 4219} 4220 4221/// \brief Perform semantic checking on a newly-created variable 4222/// declaration. 4223/// 4224/// This routine performs all of the type-checking required for a 4225/// variable declaration once it has been built. It is used both to 4226/// check variables after they have been parsed and their declarators 4227/// have been translated into a declaration, and to check variables 4228/// that have been instantiated from a template. 4229/// 4230/// Sets NewVD->isInvalidDecl() if an error was encountered. 4231/// 4232/// Returns true if the variable declaration is a redeclaration. 4233bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4234 LookupResult &Previous) { 4235 // If the decl is already known invalid, don't check it. 4236 if (NewVD->isInvalidDecl()) 4237 return false; 4238 4239 QualType T = NewVD->getType(); 4240 4241 if (T->isObjCObjectType()) { 4242 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4243 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4244 T = Context.getObjCObjectPointerType(T); 4245 NewVD->setType(T); 4246 } 4247 4248 // Emit an error if an address space was applied to decl with local storage. 4249 // This includes arrays of objects with address space qualifiers, but not 4250 // automatic variables that point to other address spaces. 4251 // ISO/IEC TR 18037 S5.1.2 4252 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4253 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4254 NewVD->setInvalidDecl(); 4255 return false; 4256 } 4257 4258 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4259 && !NewVD->hasAttr<BlocksAttr>()) { 4260 if (getLangOptions().getGC() != LangOptions::NonGC) 4261 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4262 else 4263 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4264 } 4265 4266 bool isVM = T->isVariablyModifiedType(); 4267 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4268 NewVD->hasAttr<BlocksAttr>()) 4269 getCurFunction()->setHasBranchProtectedScope(); 4270 4271 if ((isVM && NewVD->hasLinkage()) || 4272 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4273 bool SizeIsNegative; 4274 llvm::APSInt Oversized; 4275 QualType FixedTy = 4276 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4277 Oversized); 4278 4279 if (FixedTy.isNull() && T->isVariableArrayType()) { 4280 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4281 // FIXME: This won't give the correct result for 4282 // int a[10][n]; 4283 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4284 4285 if (NewVD->isFileVarDecl()) 4286 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4287 << SizeRange; 4288 else if (NewVD->getStorageClass() == SC_Static) 4289 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4290 << SizeRange; 4291 else 4292 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4293 << SizeRange; 4294 NewVD->setInvalidDecl(); 4295 return false; 4296 } 4297 4298 if (FixedTy.isNull()) { 4299 if (NewVD->isFileVarDecl()) 4300 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4301 else 4302 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4303 NewVD->setInvalidDecl(); 4304 return false; 4305 } 4306 4307 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4308 NewVD->setType(FixedTy); 4309 } 4310 4311 if (Previous.empty() && NewVD->isExternC()) { 4312 // Since we did not find anything by this name and we're declaring 4313 // an extern "C" variable, look for a non-visible extern "C" 4314 // declaration with the same name. 4315 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4316 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4317 if (Pos != LocallyScopedExternalDecls.end()) 4318 Previous.addDecl(Pos->second); 4319 } 4320 4321 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4322 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4323 << T; 4324 NewVD->setInvalidDecl(); 4325 return false; 4326 } 4327 4328 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4329 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4330 NewVD->setInvalidDecl(); 4331 return false; 4332 } 4333 4334 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4335 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4336 NewVD->setInvalidDecl(); 4337 return false; 4338 } 4339 4340 // Function pointers and references cannot have qualified function type, only 4341 // function pointer-to-members can do that. 4342 QualType Pointee; 4343 unsigned PtrOrRef = 0; 4344 if (const PointerType *Ptr = T->getAs<PointerType>()) 4345 Pointee = Ptr->getPointeeType(); 4346 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4347 Pointee = Ref->getPointeeType(); 4348 PtrOrRef = 1; 4349 } 4350 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4351 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4352 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4353 << PtrOrRef; 4354 NewVD->setInvalidDecl(); 4355 return false; 4356 } 4357 4358 if (!Previous.empty()) { 4359 MergeVarDecl(NewVD, Previous); 4360 return true; 4361 } 4362 return false; 4363} 4364 4365/// \brief Data used with FindOverriddenMethod 4366struct FindOverriddenMethodData { 4367 Sema *S; 4368 CXXMethodDecl *Method; 4369}; 4370 4371/// \brief Member lookup function that determines whether a given C++ 4372/// method overrides a method in a base class, to be used with 4373/// CXXRecordDecl::lookupInBases(). 4374static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4375 CXXBasePath &Path, 4376 void *UserData) { 4377 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4378 4379 FindOverriddenMethodData *Data 4380 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4381 4382 DeclarationName Name = Data->Method->getDeclName(); 4383 4384 // FIXME: Do we care about other names here too? 4385 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4386 // We really want to find the base class destructor here. 4387 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4388 CanQualType CT = Data->S->Context.getCanonicalType(T); 4389 4390 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4391 } 4392 4393 for (Path.Decls = BaseRecord->lookup(Name); 4394 Path.Decls.first != Path.Decls.second; 4395 ++Path.Decls.first) { 4396 NamedDecl *D = *Path.Decls.first; 4397 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4398 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4399 return true; 4400 } 4401 } 4402 4403 return false; 4404} 4405 4406/// AddOverriddenMethods - See if a method overrides any in the base classes, 4407/// and if so, check that it's a valid override and remember it. 4408bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4409 // Look for virtual methods in base classes that this method might override. 4410 CXXBasePaths Paths; 4411 FindOverriddenMethodData Data; 4412 Data.Method = MD; 4413 Data.S = this; 4414 bool AddedAny = false; 4415 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4416 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4417 E = Paths.found_decls_end(); I != E; ++I) { 4418 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4419 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4420 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4421 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4422 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4423 AddedAny = true; 4424 } 4425 } 4426 } 4427 } 4428 4429 return AddedAny; 4430} 4431 4432namespace { 4433 // Struct for holding all of the extra arguments needed by 4434 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4435 struct ActOnFDArgs { 4436 Scope *S; 4437 Declarator &D; 4438 MultiTemplateParamsArg TemplateParamLists; 4439 bool AddToScope; 4440 }; 4441} 4442 4443namespace { 4444 4445// Callback to only accept typo corrections that have a non-zero edit distance. 4446class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4447 public: 4448 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4449 return candidate.getEditDistance() > 0; 4450 } 4451}; 4452 4453} 4454 4455/// \brief Generate diagnostics for an invalid function redeclaration. 4456/// 4457/// This routine handles generating the diagnostic messages for an invalid 4458/// function redeclaration, including finding possible similar declarations 4459/// or performing typo correction if there are no previous declarations with 4460/// the same name. 4461/// 4462/// Returns a NamedDecl iff typo correction was performed and substituting in 4463/// the new declaration name does not cause new errors. 4464static NamedDecl* DiagnoseInvalidRedeclaration( 4465 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4466 ActOnFDArgs &ExtraArgs) { 4467 NamedDecl *Result = NULL; 4468 DeclarationName Name = NewFD->getDeclName(); 4469 DeclContext *NewDC = NewFD->getDeclContext(); 4470 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4471 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4472 llvm::SmallVector<unsigned, 1> MismatchedParams; 4473 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4474 TypoCorrection Correction; 4475 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4476 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4477 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4478 : diag::err_member_def_does_not_match; 4479 4480 NewFD->setInvalidDecl(); 4481 SemaRef.LookupQualifiedName(Prev, NewDC); 4482 assert(!Prev.isAmbiguous() && 4483 "Cannot have an ambiguity in previous-declaration lookup"); 4484 DifferentNameValidatorCCC Validator; 4485 if (!Prev.empty()) { 4486 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4487 Func != FuncEnd; ++Func) { 4488 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4489 if (FD && 4490 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4491 // Add 1 to the index so that 0 can mean the mismatch didn't 4492 // involve a parameter 4493 unsigned ParamNum = 4494 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4495 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4496 } 4497 } 4498 // If the qualified name lookup yielded nothing, try typo correction 4499 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4500 Prev.getLookupKind(), 0, 0, 4501 Validator, NewDC))) { 4502 // Trap errors. 4503 Sema::SFINAETrap Trap(SemaRef); 4504 4505 // Set up everything for the call to ActOnFunctionDeclarator 4506 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4507 ExtraArgs.D.getIdentifierLoc()); 4508 Previous.clear(); 4509 Previous.setLookupName(Correction.getCorrection()); 4510 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4511 CDeclEnd = Correction.end(); 4512 CDecl != CDeclEnd; ++CDecl) { 4513 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4514 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4515 MismatchedParams)) { 4516 Previous.addDecl(FD); 4517 } 4518 } 4519 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4520 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4521 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4522 // eliminate the need for the parameter pack ExtraArgs. 4523 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4524 NewFD->getDeclContext(), 4525 NewFD->getTypeSourceInfo(), 4526 Previous, 4527 ExtraArgs.TemplateParamLists, 4528 ExtraArgs.AddToScope); 4529 if (Trap.hasErrorOccurred()) { 4530 // Pretend the typo correction never occurred 4531 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4532 ExtraArgs.D.getIdentifierLoc()); 4533 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4534 Previous.clear(); 4535 Previous.setLookupName(Name); 4536 Result = NULL; 4537 } else { 4538 for (LookupResult::iterator Func = Previous.begin(), 4539 FuncEnd = Previous.end(); 4540 Func != FuncEnd; ++Func) { 4541 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4542 NearMatches.push_back(std::make_pair(FD, 0)); 4543 } 4544 } 4545 if (NearMatches.empty()) { 4546 // Ignore the correction if it didn't yield any close FunctionDecl matches 4547 Correction = TypoCorrection(); 4548 } else { 4549 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4550 : diag::err_member_def_does_not_match_suggest; 4551 } 4552 } 4553 4554 if (Correction) 4555 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4556 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4557 << FixItHint::CreateReplacement( 4558 NewFD->getLocation(), 4559 Correction.getAsString(SemaRef.getLangOptions())); 4560 else 4561 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4562 << Name << NewDC << NewFD->getLocation(); 4563 4564 bool NewFDisConst = false; 4565 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4566 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4567 4568 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4569 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4570 NearMatch != NearMatchEnd; ++NearMatch) { 4571 FunctionDecl *FD = NearMatch->first; 4572 bool FDisConst = false; 4573 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4574 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4575 4576 if (unsigned Idx = NearMatch->second) { 4577 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4578 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4579 diag::note_member_def_close_param_match) 4580 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4581 } else if (Correction) { 4582 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4583 << Correction.getQuoted(SemaRef.getLangOptions()); 4584 } else if (FDisConst != NewFDisConst) { 4585 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4586 << NewFDisConst << FD->getSourceRange().getEnd(); 4587 } else 4588 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4589 } 4590 return Result; 4591} 4592 4593static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4594 Declarator &D) { 4595 switch (D.getDeclSpec().getStorageClassSpec()) { 4596 default: llvm_unreachable("Unknown storage class!"); 4597 case DeclSpec::SCS_auto: 4598 case DeclSpec::SCS_register: 4599 case DeclSpec::SCS_mutable: 4600 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4601 diag::err_typecheck_sclass_func); 4602 D.setInvalidType(); 4603 break; 4604 case DeclSpec::SCS_unspecified: break; 4605 case DeclSpec::SCS_extern: return SC_Extern; 4606 case DeclSpec::SCS_static: { 4607 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4608 // C99 6.7.1p5: 4609 // The declaration of an identifier for a function that has 4610 // block scope shall have no explicit storage-class specifier 4611 // other than extern 4612 // See also (C++ [dcl.stc]p4). 4613 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4614 diag::err_static_block_func); 4615 break; 4616 } else 4617 return SC_Static; 4618 } 4619 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4620 } 4621 4622 // No explicit storage class has already been returned 4623 return SC_None; 4624} 4625 4626static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4627 DeclContext *DC, QualType &R, 4628 TypeSourceInfo *TInfo, 4629 FunctionDecl::StorageClass SC, 4630 bool &IsVirtualOkay) { 4631 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4632 DeclarationName Name = NameInfo.getName(); 4633 4634 FunctionDecl *NewFD = 0; 4635 bool isInline = D.getDeclSpec().isInlineSpecified(); 4636 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4637 FunctionDecl::StorageClass SCAsWritten 4638 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4639 4640 if (!SemaRef.getLangOptions().CPlusPlus) { 4641 // Determine whether the function was written with a 4642 // prototype. This true when: 4643 // - there is a prototype in the declarator, or 4644 // - the type R of the function is some kind of typedef or other reference 4645 // to a type name (which eventually refers to a function type). 4646 bool HasPrototype = 4647 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4648 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4649 4650 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4651 D.getSourceRange().getBegin(), NameInfo, R, 4652 TInfo, SC, SCAsWritten, isInline, 4653 HasPrototype); 4654 if (D.isInvalidType()) 4655 NewFD->setInvalidDecl(); 4656 4657 // Set the lexical context. 4658 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4659 4660 return NewFD; 4661 } 4662 4663 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4664 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4665 4666 // Check that the return type is not an abstract class type. 4667 // For record types, this is done by the AbstractClassUsageDiagnoser once 4668 // the class has been completely parsed. 4669 if (!DC->isRecord() && 4670 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4671 R->getAs<FunctionType>()->getResultType(), 4672 diag::err_abstract_type_in_decl, 4673 SemaRef.AbstractReturnType)) 4674 D.setInvalidType(); 4675 4676 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4677 // This is a C++ constructor declaration. 4678 assert(DC->isRecord() && 4679 "Constructors can only be declared in a member context"); 4680 4681 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4682 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4683 D.getSourceRange().getBegin(), NameInfo, 4684 R, TInfo, isExplicit, isInline, 4685 /*isImplicitlyDeclared=*/false, 4686 isConstexpr); 4687 4688 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4689 // This is a C++ destructor declaration. 4690 if (DC->isRecord()) { 4691 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4692 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4693 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4694 SemaRef.Context, Record, 4695 D.getSourceRange().getBegin(), 4696 NameInfo, R, TInfo, isInline, 4697 /*isImplicitlyDeclared=*/false); 4698 4699 // If the class is complete, then we now create the implicit exception 4700 // specification. If the class is incomplete or dependent, we can't do 4701 // it yet. 4702 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4703 Record->getDefinition() && !Record->isBeingDefined() && 4704 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4705 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4706 } 4707 4708 IsVirtualOkay = true; 4709 return NewDD; 4710 4711 } else { 4712 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4713 D.setInvalidType(); 4714 4715 // Create a FunctionDecl to satisfy the function definition parsing 4716 // code path. 4717 return FunctionDecl::Create(SemaRef.Context, DC, 4718 D.getSourceRange().getBegin(), 4719 D.getIdentifierLoc(), Name, R, TInfo, 4720 SC, SCAsWritten, isInline, 4721 /*hasPrototype=*/true, isConstexpr); 4722 } 4723 4724 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4725 if (!DC->isRecord()) { 4726 SemaRef.Diag(D.getIdentifierLoc(), 4727 diag::err_conv_function_not_member); 4728 return 0; 4729 } 4730 4731 SemaRef.CheckConversionDeclarator(D, R, SC); 4732 IsVirtualOkay = true; 4733 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4734 D.getSourceRange().getBegin(), NameInfo, 4735 R, TInfo, isInline, isExplicit, 4736 isConstexpr, SourceLocation()); 4737 4738 } else if (DC->isRecord()) { 4739 // If the name of the function is the same as the name of the record, 4740 // then this must be an invalid constructor that has a return type. 4741 // (The parser checks for a return type and makes the declarator a 4742 // constructor if it has no return type). 4743 if (Name.getAsIdentifierInfo() && 4744 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4745 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4746 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4747 << SourceRange(D.getIdentifierLoc()); 4748 return 0; 4749 } 4750 4751 bool isStatic = SC == SC_Static; 4752 4753 // [class.free]p1: 4754 // Any allocation function for a class T is a static member 4755 // (even if not explicitly declared static). 4756 if (Name.getCXXOverloadedOperator() == OO_New || 4757 Name.getCXXOverloadedOperator() == OO_Array_New) 4758 isStatic = true; 4759 4760 // [class.free]p6 Any deallocation function for a class X is a static member 4761 // (even if not explicitly declared static). 4762 if (Name.getCXXOverloadedOperator() == OO_Delete || 4763 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4764 isStatic = true; 4765 4766 IsVirtualOkay = !isStatic; 4767 4768 // This is a C++ method declaration. 4769 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4770 D.getSourceRange().getBegin(), NameInfo, R, 4771 TInfo, isStatic, SCAsWritten, isInline, 4772 isConstexpr, SourceLocation()); 4773 4774 } else { 4775 // Determine whether the function was written with a 4776 // prototype. This true when: 4777 // - we're in C++ (where every function has a prototype), 4778 return FunctionDecl::Create(SemaRef.Context, DC, 4779 D.getSourceRange().getBegin(), 4780 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4781 true/*HasPrototype*/, isConstexpr); 4782 } 4783} 4784 4785NamedDecl* 4786Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4787 TypeSourceInfo *TInfo, LookupResult &Previous, 4788 MultiTemplateParamsArg TemplateParamLists, 4789 bool &AddToScope) { 4790 QualType R = TInfo->getType(); 4791 4792 assert(R.getTypePtr()->isFunctionType()); 4793 4794 // TODO: consider using NameInfo for diagnostic. 4795 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4796 DeclarationName Name = NameInfo.getName(); 4797 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4798 4799 if (D.getDeclSpec().isThreadSpecified()) 4800 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4801 4802 // Do not allow returning a objc interface by-value. 4803 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4804 Diag(D.getIdentifierLoc(), 4805 diag::err_object_cannot_be_passed_returned_by_value) << 0 4806 << R->getAs<FunctionType>()->getResultType() 4807 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4808 4809 QualType T = R->getAs<FunctionType>()->getResultType(); 4810 T = Context.getObjCObjectPointerType(T); 4811 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4812 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4813 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4814 FPT->getNumArgs(), EPI); 4815 } 4816 else if (isa<FunctionNoProtoType>(R)) 4817 R = Context.getFunctionNoProtoType(T); 4818 } 4819 4820 bool isFriend = false; 4821 FunctionTemplateDecl *FunctionTemplate = 0; 4822 bool isExplicitSpecialization = false; 4823 bool isFunctionTemplateSpecialization = false; 4824 bool isDependentClassScopeExplicitSpecialization = false; 4825 bool isVirtualOkay = false; 4826 4827 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4828 isVirtualOkay); 4829 if (!NewFD) return 0; 4830 4831 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4832 NewFD->setTopLevelDeclInObjCContainer(); 4833 4834 if (getLangOptions().CPlusPlus) { 4835 bool isInline = D.getDeclSpec().isInlineSpecified(); 4836 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4837 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4838 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4839 isFriend = D.getDeclSpec().isFriendSpecified(); 4840 if (isFriend && !isInline && D.isFunctionDefinition()) { 4841 // C++ [class.friend]p5 4842 // A function can be defined in a friend declaration of a 4843 // class . . . . Such a function is implicitly inline. 4844 NewFD->setImplicitlyInline(); 4845 } 4846 4847 SetNestedNameSpecifier(NewFD, D); 4848 isExplicitSpecialization = false; 4849 isFunctionTemplateSpecialization = false; 4850 if (D.isInvalidType()) 4851 NewFD->setInvalidDecl(); 4852 4853 // Set the lexical context. If the declarator has a C++ 4854 // scope specifier, or is the object of a friend declaration, the 4855 // lexical context will be different from the semantic context. 4856 NewFD->setLexicalDeclContext(CurContext); 4857 4858 // Match up the template parameter lists with the scope specifier, then 4859 // determine whether we have a template or a template specialization. 4860 bool Invalid = false; 4861 if (TemplateParameterList *TemplateParams 4862 = MatchTemplateParametersToScopeSpecifier( 4863 D.getDeclSpec().getSourceRange().getBegin(), 4864 D.getIdentifierLoc(), 4865 D.getCXXScopeSpec(), 4866 TemplateParamLists.get(), 4867 TemplateParamLists.size(), 4868 isFriend, 4869 isExplicitSpecialization, 4870 Invalid)) { 4871 if (TemplateParams->size() > 0) { 4872 // This is a function template 4873 4874 // Check that we can declare a template here. 4875 if (CheckTemplateDeclScope(S, TemplateParams)) 4876 return 0; 4877 4878 // A destructor cannot be a template. 4879 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4880 Diag(NewFD->getLocation(), diag::err_destructor_template); 4881 return 0; 4882 } 4883 4884 // If we're adding a template to a dependent context, we may need to 4885 // rebuilding some of the types used within the template parameter list, 4886 // now that we know what the current instantiation is. 4887 if (DC->isDependentContext()) { 4888 ContextRAII SavedContext(*this, DC); 4889 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4890 Invalid = true; 4891 } 4892 4893 4894 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4895 NewFD->getLocation(), 4896 Name, TemplateParams, 4897 NewFD); 4898 FunctionTemplate->setLexicalDeclContext(CurContext); 4899 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4900 4901 // For source fidelity, store the other template param lists. 4902 if (TemplateParamLists.size() > 1) { 4903 NewFD->setTemplateParameterListsInfo(Context, 4904 TemplateParamLists.size() - 1, 4905 TemplateParamLists.release()); 4906 } 4907 } else { 4908 // This is a function template specialization. 4909 isFunctionTemplateSpecialization = true; 4910 // For source fidelity, store all the template param lists. 4911 NewFD->setTemplateParameterListsInfo(Context, 4912 TemplateParamLists.size(), 4913 TemplateParamLists.release()); 4914 4915 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4916 if (isFriend) { 4917 // We want to remove the "template<>", found here. 4918 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4919 4920 // If we remove the template<> and the name is not a 4921 // template-id, we're actually silently creating a problem: 4922 // the friend declaration will refer to an untemplated decl, 4923 // and clearly the user wants a template specialization. So 4924 // we need to insert '<>' after the name. 4925 SourceLocation InsertLoc; 4926 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4927 InsertLoc = D.getName().getSourceRange().getEnd(); 4928 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4929 } 4930 4931 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4932 << Name << RemoveRange 4933 << FixItHint::CreateRemoval(RemoveRange) 4934 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4935 } 4936 } 4937 } 4938 else { 4939 // All template param lists were matched against the scope specifier: 4940 // this is NOT (an explicit specialization of) a template. 4941 if (TemplateParamLists.size() > 0) 4942 // For source fidelity, store all the template param lists. 4943 NewFD->setTemplateParameterListsInfo(Context, 4944 TemplateParamLists.size(), 4945 TemplateParamLists.release()); 4946 } 4947 4948 if (Invalid) { 4949 NewFD->setInvalidDecl(); 4950 if (FunctionTemplate) 4951 FunctionTemplate->setInvalidDecl(); 4952 } 4953 4954 // If we see "T var();" at block scope, where T is a class type, it is 4955 // probably an attempt to initialize a variable, not a function declaration. 4956 // We don't catch this case earlier, since there is no ambiguity here. 4957 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4958 CurContext->isFunctionOrMethod() && 4959 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4960 D.getDeclSpec().getStorageClassSpecAsWritten() 4961 == DeclSpec::SCS_unspecified) { 4962 QualType T = R->getAs<FunctionType>()->getResultType(); 4963 DeclaratorChunk &C = D.getTypeObject(0); 4964 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4965 !C.Fun.TrailingReturnType && 4966 C.Fun.getExceptionSpecType() == EST_None) { 4967 SourceRange ParenRange(C.Loc, C.EndLoc); 4968 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 4969 4970 // If the declaration looks like: 4971 // T var1, 4972 // f(); 4973 // and name lookup finds a function named 'f', then the ',' was 4974 // probably intended to be a ';'. 4975 if (!D.isFirstDeclarator() && D.getIdentifier()) { 4976 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 4977 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 4978 if (Comma.getFileID() != Name.getFileID() || 4979 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 4980 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 4981 LookupOrdinaryName); 4982 if (LookupName(Result, S)) 4983 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 4984 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 4985 } 4986 } 4987 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 4988 // Empty parens mean value-initialization, and no parens mean default 4989 // initialization. These are equivalent if the default constructor is 4990 // user-provided, or if zero-initialization is a no-op. 4991 if (RD && RD->hasDefinition() && 4992 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 4993 Diag(C.Loc, diag::note_empty_parens_default_ctor) 4994 << FixItHint::CreateRemoval(ParenRange); 4995 else if (const char *Init = getFixItZeroInitializerForType(T)) 4996 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 4997 << FixItHint::CreateReplacement(ParenRange, Init); 4998 else if (LangOpts.CPlusPlus0x) 4999 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5000 << FixItHint::CreateReplacement(ParenRange, "{}"); 5001 } 5002 } 5003 5004 // C++ [dcl.fct.spec]p5: 5005 // The virtual specifier shall only be used in declarations of 5006 // nonstatic class member functions that appear within a 5007 // member-specification of a class declaration; see 10.3. 5008 // 5009 if (isVirtual && !NewFD->isInvalidDecl()) { 5010 if (!isVirtualOkay) { 5011 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5012 diag::err_virtual_non_function); 5013 } else if (!CurContext->isRecord()) { 5014 // 'virtual' was specified outside of the class. 5015 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5016 diag::err_virtual_out_of_class) 5017 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5018 } else if (NewFD->getDescribedFunctionTemplate()) { 5019 // C++ [temp.mem]p3: 5020 // A member function template shall not be virtual. 5021 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5022 diag::err_virtual_member_function_template) 5023 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5024 } else { 5025 // Okay: Add virtual to the method. 5026 NewFD->setVirtualAsWritten(true); 5027 } 5028 } 5029 5030 // C++ [dcl.fct.spec]p3: 5031 // The inline specifier shall not appear on a block scope function 5032 // declaration. 5033 if (isInline && !NewFD->isInvalidDecl()) { 5034 if (CurContext->isFunctionOrMethod()) { 5035 // 'inline' is not allowed on block scope function declaration. 5036 Diag(D.getDeclSpec().getInlineSpecLoc(), 5037 diag::err_inline_declaration_block_scope) << Name 5038 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5039 } 5040 } 5041 5042 // C++ [dcl.fct.spec]p6: 5043 // The explicit specifier shall be used only in the declaration of a 5044 // constructor or conversion function within its class definition; 5045 // see 12.3.1 and 12.3.2. 5046 if (isExplicit && !NewFD->isInvalidDecl()) { 5047 if (!CurContext->isRecord()) { 5048 // 'explicit' was specified outside of the class. 5049 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5050 diag::err_explicit_out_of_class) 5051 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5052 } else if (!isa<CXXConstructorDecl>(NewFD) && 5053 !isa<CXXConversionDecl>(NewFD)) { 5054 // 'explicit' was specified on a function that wasn't a constructor 5055 // or conversion function. 5056 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5057 diag::err_explicit_non_ctor_or_conv_function) 5058 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5059 } 5060 } 5061 5062 if (isConstexpr) { 5063 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5064 // are implicitly inline. 5065 NewFD->setImplicitlyInline(); 5066 5067 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5068 // be either constructors or to return a literal type. Therefore, 5069 // destructors cannot be declared constexpr. 5070 if (isa<CXXDestructorDecl>(NewFD)) 5071 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5072 } 5073 5074 // If __module_private__ was specified, mark the function accordingly. 5075 if (D.getDeclSpec().isModulePrivateSpecified()) { 5076 if (isFunctionTemplateSpecialization) { 5077 SourceLocation ModulePrivateLoc 5078 = D.getDeclSpec().getModulePrivateSpecLoc(); 5079 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5080 << 0 5081 << FixItHint::CreateRemoval(ModulePrivateLoc); 5082 } else { 5083 NewFD->setModulePrivate(); 5084 if (FunctionTemplate) 5085 FunctionTemplate->setModulePrivate(); 5086 } 5087 } 5088 5089 if (isFriend) { 5090 // For now, claim that the objects have no previous declaration. 5091 if (FunctionTemplate) { 5092 FunctionTemplate->setObjectOfFriendDecl(false); 5093 FunctionTemplate->setAccess(AS_public); 5094 } 5095 NewFD->setObjectOfFriendDecl(false); 5096 NewFD->setAccess(AS_public); 5097 } 5098 5099 // If a function is defined as defaulted or deleted, mark it as such now. 5100 switch (D.getFunctionDefinitionKind()) { 5101 case FDK_Declaration: 5102 case FDK_Definition: 5103 break; 5104 5105 case FDK_Defaulted: 5106 NewFD->setDefaulted(); 5107 break; 5108 5109 case FDK_Deleted: 5110 NewFD->setDeletedAsWritten(); 5111 break; 5112 } 5113 5114 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5115 D.isFunctionDefinition()) { 5116 // C++ [class.mfct]p2: 5117 // A member function may be defined (8.4) in its class definition, in 5118 // which case it is an inline member function (7.1.2) 5119 NewFD->setImplicitlyInline(); 5120 } 5121 5122 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5123 !CurContext->isRecord()) { 5124 // C++ [class.static]p1: 5125 // A data or function member of a class may be declared static 5126 // in a class definition, in which case it is a static member of 5127 // the class. 5128 5129 // Complain about the 'static' specifier if it's on an out-of-line 5130 // member function definition. 5131 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5132 diag::err_static_out_of_line) 5133 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5134 } 5135 } 5136 5137 // Filter out previous declarations that don't match the scope. 5138 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5139 isExplicitSpecialization || 5140 isFunctionTemplateSpecialization); 5141 5142 // Handle GNU asm-label extension (encoded as an attribute). 5143 if (Expr *E = (Expr*) D.getAsmLabel()) { 5144 // The parser guarantees this is a string. 5145 StringLiteral *SE = cast<StringLiteral>(E); 5146 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5147 SE->getString())); 5148 } 5149 5150 // Copy the parameter declarations from the declarator D to the function 5151 // declaration NewFD, if they are available. First scavenge them into Params. 5152 SmallVector<ParmVarDecl*, 16> Params; 5153 if (D.isFunctionDeclarator()) { 5154 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5155 5156 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5157 // function that takes no arguments, not a function that takes a 5158 // single void argument. 5159 // We let through "const void" here because Sema::GetTypeForDeclarator 5160 // already checks for that case. 5161 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5162 FTI.ArgInfo[0].Param && 5163 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5164 // Empty arg list, don't push any params. 5165 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5166 5167 // In C++, the empty parameter-type-list must be spelled "void"; a 5168 // typedef of void is not permitted. 5169 if (getLangOptions().CPlusPlus && 5170 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5171 bool IsTypeAlias = false; 5172 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5173 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5174 else if (const TemplateSpecializationType *TST = 5175 Param->getType()->getAs<TemplateSpecializationType>()) 5176 IsTypeAlias = TST->isTypeAlias(); 5177 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5178 << IsTypeAlias; 5179 } 5180 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5181 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5182 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5183 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5184 Param->setDeclContext(NewFD); 5185 Params.push_back(Param); 5186 5187 if (Param->isInvalidDecl()) 5188 NewFD->setInvalidDecl(); 5189 } 5190 } 5191 5192 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5193 // When we're declaring a function with a typedef, typeof, etc as in the 5194 // following example, we'll need to synthesize (unnamed) 5195 // parameters for use in the declaration. 5196 // 5197 // @code 5198 // typedef void fn(int); 5199 // fn f; 5200 // @endcode 5201 5202 // Synthesize a parameter for each argument type. 5203 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5204 AE = FT->arg_type_end(); AI != AE; ++AI) { 5205 ParmVarDecl *Param = 5206 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5207 Param->setScopeInfo(0, Params.size()); 5208 Params.push_back(Param); 5209 } 5210 } else { 5211 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5212 "Should not need args for typedef of non-prototype fn"); 5213 } 5214 5215 // Finally, we know we have the right number of parameters, install them. 5216 NewFD->setParams(Params); 5217 5218 // Process the non-inheritable attributes on this declaration. 5219 ProcessDeclAttributes(S, NewFD, D, 5220 /*NonInheritable=*/true, /*Inheritable=*/false); 5221 5222 if (!getLangOptions().CPlusPlus) { 5223 // Perform semantic checking on the function declaration. 5224 bool isExplicitSpecialization=false; 5225 if (!NewFD->isInvalidDecl()) { 5226 if (NewFD->getResultType()->isVariablyModifiedType()) { 5227 // Functions returning a variably modified type violate C99 6.7.5.2p2 5228 // because all functions have linkage. 5229 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5230 NewFD->setInvalidDecl(); 5231 } else { 5232 if (NewFD->isMain()) 5233 CheckMain(NewFD, D.getDeclSpec()); 5234 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5235 isExplicitSpecialization)); 5236 } 5237 } 5238 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5239 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5240 "previous declaration set still overloaded"); 5241 } else { 5242 // If the declarator is a template-id, translate the parser's template 5243 // argument list into our AST format. 5244 bool HasExplicitTemplateArgs = false; 5245 TemplateArgumentListInfo TemplateArgs; 5246 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5247 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5248 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5249 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5250 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5251 TemplateId->getTemplateArgs(), 5252 TemplateId->NumArgs); 5253 translateTemplateArguments(TemplateArgsPtr, 5254 TemplateArgs); 5255 TemplateArgsPtr.release(); 5256 5257 HasExplicitTemplateArgs = true; 5258 5259 if (NewFD->isInvalidDecl()) { 5260 HasExplicitTemplateArgs = false; 5261 } else if (FunctionTemplate) { 5262 // Function template with explicit template arguments. 5263 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5264 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5265 5266 HasExplicitTemplateArgs = false; 5267 } else if (!isFunctionTemplateSpecialization && 5268 !D.getDeclSpec().isFriendSpecified()) { 5269 // We have encountered something that the user meant to be a 5270 // specialization (because it has explicitly-specified template 5271 // arguments) but that was not introduced with a "template<>" (or had 5272 // too few of them). 5273 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5274 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5275 << FixItHint::CreateInsertion( 5276 D.getDeclSpec().getSourceRange().getBegin(), 5277 "template<> "); 5278 isFunctionTemplateSpecialization = true; 5279 } else { 5280 // "friend void foo<>(int);" is an implicit specialization decl. 5281 isFunctionTemplateSpecialization = true; 5282 } 5283 } else if (isFriend && isFunctionTemplateSpecialization) { 5284 // This combination is only possible in a recovery case; the user 5285 // wrote something like: 5286 // template <> friend void foo(int); 5287 // which we're recovering from as if the user had written: 5288 // friend void foo<>(int); 5289 // Go ahead and fake up a template id. 5290 HasExplicitTemplateArgs = true; 5291 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5292 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5293 } 5294 5295 // If it's a friend (and only if it's a friend), it's possible 5296 // that either the specialized function type or the specialized 5297 // template is dependent, and therefore matching will fail. In 5298 // this case, don't check the specialization yet. 5299 bool InstantiationDependent = false; 5300 if (isFunctionTemplateSpecialization && isFriend && 5301 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5302 TemplateSpecializationType::anyDependentTemplateArguments( 5303 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5304 InstantiationDependent))) { 5305 assert(HasExplicitTemplateArgs && 5306 "friend function specialization without template args"); 5307 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5308 Previous)) 5309 NewFD->setInvalidDecl(); 5310 } else if (isFunctionTemplateSpecialization) { 5311 if (CurContext->isDependentContext() && CurContext->isRecord() 5312 && !isFriend) { 5313 isDependentClassScopeExplicitSpecialization = true; 5314 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5315 diag::ext_function_specialization_in_class : 5316 diag::err_function_specialization_in_class) 5317 << NewFD->getDeclName(); 5318 } else if (CheckFunctionTemplateSpecialization(NewFD, 5319 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5320 Previous)) 5321 NewFD->setInvalidDecl(); 5322 5323 // C++ [dcl.stc]p1: 5324 // A storage-class-specifier shall not be specified in an explicit 5325 // specialization (14.7.3) 5326 if (SC != SC_None) { 5327 if (SC != NewFD->getStorageClass()) 5328 Diag(NewFD->getLocation(), 5329 diag::err_explicit_specialization_inconsistent_storage_class) 5330 << SC 5331 << FixItHint::CreateRemoval( 5332 D.getDeclSpec().getStorageClassSpecLoc()); 5333 5334 else 5335 Diag(NewFD->getLocation(), 5336 diag::ext_explicit_specialization_storage_class) 5337 << FixItHint::CreateRemoval( 5338 D.getDeclSpec().getStorageClassSpecLoc()); 5339 } 5340 5341 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5342 if (CheckMemberSpecialization(NewFD, Previous)) 5343 NewFD->setInvalidDecl(); 5344 } 5345 5346 // Perform semantic checking on the function declaration. 5347 if (!isDependentClassScopeExplicitSpecialization) { 5348 if (NewFD->isInvalidDecl()) { 5349 // If this is a class member, mark the class invalid immediately. 5350 // This avoids some consistency errors later. 5351 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5352 methodDecl->getParent()->setInvalidDecl(); 5353 } else { 5354 if (NewFD->isMain()) 5355 CheckMain(NewFD, D.getDeclSpec()); 5356 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5357 isExplicitSpecialization)); 5358 } 5359 } 5360 5361 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5362 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5363 "previous declaration set still overloaded"); 5364 5365 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5366 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5367 NewFD->setInvalidDecl(); 5368 5369 NamedDecl *PrincipalDecl = (FunctionTemplate 5370 ? cast<NamedDecl>(FunctionTemplate) 5371 : NewFD); 5372 5373 if (isFriend && D.isRedeclaration()) { 5374 AccessSpecifier Access = AS_public; 5375 if (!NewFD->isInvalidDecl()) 5376 Access = NewFD->getPreviousDecl()->getAccess(); 5377 5378 NewFD->setAccess(Access); 5379 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5380 5381 PrincipalDecl->setObjectOfFriendDecl(true); 5382 } 5383 5384 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5385 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5386 PrincipalDecl->setNonMemberOperator(); 5387 5388 // If we have a function template, check the template parameter 5389 // list. This will check and merge default template arguments. 5390 if (FunctionTemplate) { 5391 FunctionTemplateDecl *PrevTemplate = 5392 FunctionTemplate->getPreviousDecl(); 5393 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5394 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5395 D.getDeclSpec().isFriendSpecified() 5396 ? (D.isFunctionDefinition() 5397 ? TPC_FriendFunctionTemplateDefinition 5398 : TPC_FriendFunctionTemplate) 5399 : (D.getCXXScopeSpec().isSet() && 5400 DC && DC->isRecord() && 5401 DC->isDependentContext()) 5402 ? TPC_ClassTemplateMember 5403 : TPC_FunctionTemplate); 5404 } 5405 5406 if (NewFD->isInvalidDecl()) { 5407 // Ignore all the rest of this. 5408 } else if (!D.isRedeclaration()) { 5409 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5410 AddToScope }; 5411 // Fake up an access specifier if it's supposed to be a class member. 5412 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5413 NewFD->setAccess(AS_public); 5414 5415 // Qualified decls generally require a previous declaration. 5416 if (D.getCXXScopeSpec().isSet()) { 5417 // ...with the major exception of templated-scope or 5418 // dependent-scope friend declarations. 5419 5420 // TODO: we currently also suppress this check in dependent 5421 // contexts because (1) the parameter depth will be off when 5422 // matching friend templates and (2) we might actually be 5423 // selecting a friend based on a dependent factor. But there 5424 // are situations where these conditions don't apply and we 5425 // can actually do this check immediately. 5426 if (isFriend && 5427 (TemplateParamLists.size() || 5428 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5429 CurContext->isDependentContext())) { 5430 // ignore these 5431 } else { 5432 // The user tried to provide an out-of-line definition for a 5433 // function that is a member of a class or namespace, but there 5434 // was no such member function declared (C++ [class.mfct]p2, 5435 // C++ [namespace.memdef]p2). For example: 5436 // 5437 // class X { 5438 // void f() const; 5439 // }; 5440 // 5441 // void X::f() { } // ill-formed 5442 // 5443 // Complain about this problem, and attempt to suggest close 5444 // matches (e.g., those that differ only in cv-qualifiers and 5445 // whether the parameter types are references). 5446 5447 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5448 NewFD, 5449 ExtraArgs)) { 5450 AddToScope = ExtraArgs.AddToScope; 5451 return Result; 5452 } 5453 } 5454 5455 // Unqualified local friend declarations are required to resolve 5456 // to something. 5457 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5458 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5459 NewFD, 5460 ExtraArgs)) { 5461 AddToScope = ExtraArgs.AddToScope; 5462 return Result; 5463 } 5464 } 5465 5466 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5467 !isFriend && !isFunctionTemplateSpecialization && 5468 !isExplicitSpecialization) { 5469 // An out-of-line member function declaration must also be a 5470 // definition (C++ [dcl.meaning]p1). 5471 // Note that this is not the case for explicit specializations of 5472 // function templates or member functions of class templates, per 5473 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5474 // extension for compatibility with old SWIG code which likes to 5475 // generate them. 5476 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5477 << D.getCXXScopeSpec().getRange(); 5478 } 5479 } 5480 5481 5482 // Handle attributes. We need to have merged decls when handling attributes 5483 // (for example to check for conflicts, etc). 5484 // FIXME: This needs to happen before we merge declarations. Then, 5485 // let attribute merging cope with attribute conflicts. 5486 ProcessDeclAttributes(S, NewFD, D, 5487 /*NonInheritable=*/false, /*Inheritable=*/true); 5488 5489 // attributes declared post-definition are currently ignored 5490 // FIXME: This should happen during attribute merging 5491 if (D.isRedeclaration() && Previous.isSingleResult()) { 5492 const FunctionDecl *Def; 5493 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5494 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5495 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5496 Diag(Def->getLocation(), diag::note_previous_definition); 5497 } 5498 } 5499 5500 AddKnownFunctionAttributes(NewFD); 5501 5502 if (NewFD->hasAttr<OverloadableAttr>() && 5503 !NewFD->getType()->getAs<FunctionProtoType>()) { 5504 Diag(NewFD->getLocation(), 5505 diag::err_attribute_overloadable_no_prototype) 5506 << NewFD; 5507 5508 // Turn this into a variadic function with no parameters. 5509 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5510 FunctionProtoType::ExtProtoInfo EPI; 5511 EPI.Variadic = true; 5512 EPI.ExtInfo = FT->getExtInfo(); 5513 5514 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5515 NewFD->setType(R); 5516 } 5517 5518 // If there's a #pragma GCC visibility in scope, and this isn't a class 5519 // member, set the visibility of this function. 5520 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5521 AddPushedVisibilityAttribute(NewFD); 5522 5523 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5524 // marking the function. 5525 AddCFAuditedAttribute(NewFD); 5526 5527 // If this is a locally-scoped extern C function, update the 5528 // map of such names. 5529 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5530 && !NewFD->isInvalidDecl()) 5531 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5532 5533 // Set this FunctionDecl's range up to the right paren. 5534 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5535 5536 if (getLangOptions().CPlusPlus) { 5537 if (FunctionTemplate) { 5538 if (NewFD->isInvalidDecl()) 5539 FunctionTemplate->setInvalidDecl(); 5540 return FunctionTemplate; 5541 } 5542 } 5543 5544 MarkUnusedFileScopedDecl(NewFD); 5545 5546 if (getLangOptions().CUDA) 5547 if (IdentifierInfo *II = NewFD->getIdentifier()) 5548 if (!NewFD->isInvalidDecl() && 5549 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5550 if (II->isStr("cudaConfigureCall")) { 5551 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5552 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5553 5554 Context.setcudaConfigureCallDecl(NewFD); 5555 } 5556 } 5557 5558 // Here we have an function template explicit specialization at class scope. 5559 // The actually specialization will be postponed to template instatiation 5560 // time via the ClassScopeFunctionSpecializationDecl node. 5561 if (isDependentClassScopeExplicitSpecialization) { 5562 ClassScopeFunctionSpecializationDecl *NewSpec = 5563 ClassScopeFunctionSpecializationDecl::Create( 5564 Context, CurContext, SourceLocation(), 5565 cast<CXXMethodDecl>(NewFD)); 5566 CurContext->addDecl(NewSpec); 5567 AddToScope = false; 5568 } 5569 5570 return NewFD; 5571} 5572 5573/// \brief Perform semantic checking of a new function declaration. 5574/// 5575/// Performs semantic analysis of the new function declaration 5576/// NewFD. This routine performs all semantic checking that does not 5577/// require the actual declarator involved in the declaration, and is 5578/// used both for the declaration of functions as they are parsed 5579/// (called via ActOnDeclarator) and for the declaration of functions 5580/// that have been instantiated via C++ template instantiation (called 5581/// via InstantiateDecl). 5582/// 5583/// \param IsExplicitSpecialiation whether this new function declaration is 5584/// an explicit specialization of the previous declaration. 5585/// 5586/// This sets NewFD->isInvalidDecl() to true if there was an error. 5587/// 5588/// Returns true if the function declaration is a redeclaration. 5589bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5590 LookupResult &Previous, 5591 bool IsExplicitSpecialization) { 5592 assert(!NewFD->getResultType()->isVariablyModifiedType() 5593 && "Variably modified return types are not handled here"); 5594 5595 // Check for a previous declaration of this name. 5596 if (Previous.empty() && NewFD->isExternC()) { 5597 // Since we did not find anything by this name and we're declaring 5598 // an extern "C" function, look for a non-visible extern "C" 5599 // declaration with the same name. 5600 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5601 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5602 if (Pos != LocallyScopedExternalDecls.end()) 5603 Previous.addDecl(Pos->second); 5604 } 5605 5606 bool Redeclaration = false; 5607 5608 // Merge or overload the declaration with an existing declaration of 5609 // the same name, if appropriate. 5610 if (!Previous.empty()) { 5611 // Determine whether NewFD is an overload of PrevDecl or 5612 // a declaration that requires merging. If it's an overload, 5613 // there's no more work to do here; we'll just add the new 5614 // function to the scope. 5615 5616 NamedDecl *OldDecl = 0; 5617 if (!AllowOverloadingOfFunction(Previous, Context)) { 5618 Redeclaration = true; 5619 OldDecl = Previous.getFoundDecl(); 5620 } else { 5621 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5622 /*NewIsUsingDecl*/ false)) { 5623 case Ovl_Match: 5624 Redeclaration = true; 5625 break; 5626 5627 case Ovl_NonFunction: 5628 Redeclaration = true; 5629 break; 5630 5631 case Ovl_Overload: 5632 Redeclaration = false; 5633 break; 5634 } 5635 5636 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5637 // If a function name is overloadable in C, then every function 5638 // with that name must be marked "overloadable". 5639 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5640 << Redeclaration << NewFD; 5641 NamedDecl *OverloadedDecl = 0; 5642 if (Redeclaration) 5643 OverloadedDecl = OldDecl; 5644 else if (!Previous.empty()) 5645 OverloadedDecl = Previous.getRepresentativeDecl(); 5646 if (OverloadedDecl) 5647 Diag(OverloadedDecl->getLocation(), 5648 diag::note_attribute_overloadable_prev_overload); 5649 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5650 Context)); 5651 } 5652 } 5653 5654 if (Redeclaration) { 5655 // NewFD and OldDecl represent declarations that need to be 5656 // merged. 5657 if (MergeFunctionDecl(NewFD, OldDecl)) { 5658 NewFD->setInvalidDecl(); 5659 return Redeclaration; 5660 } 5661 5662 Previous.clear(); 5663 Previous.addDecl(OldDecl); 5664 5665 if (FunctionTemplateDecl *OldTemplateDecl 5666 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5667 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5668 FunctionTemplateDecl *NewTemplateDecl 5669 = NewFD->getDescribedFunctionTemplate(); 5670 assert(NewTemplateDecl && "Template/non-template mismatch"); 5671 if (CXXMethodDecl *Method 5672 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5673 Method->setAccess(OldTemplateDecl->getAccess()); 5674 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5675 } 5676 5677 // If this is an explicit specialization of a member that is a function 5678 // template, mark it as a member specialization. 5679 if (IsExplicitSpecialization && 5680 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5681 NewTemplateDecl->setMemberSpecialization(); 5682 assert(OldTemplateDecl->isMemberSpecialization()); 5683 } 5684 5685 } else { 5686 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5687 NewFD->setAccess(OldDecl->getAccess()); 5688 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5689 } 5690 } 5691 } 5692 5693 // Semantic checking for this function declaration (in isolation). 5694 if (getLangOptions().CPlusPlus) { 5695 // C++-specific checks. 5696 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5697 CheckConstructor(Constructor); 5698 } else if (CXXDestructorDecl *Destructor = 5699 dyn_cast<CXXDestructorDecl>(NewFD)) { 5700 CXXRecordDecl *Record = Destructor->getParent(); 5701 QualType ClassType = Context.getTypeDeclType(Record); 5702 5703 // FIXME: Shouldn't we be able to perform this check even when the class 5704 // type is dependent? Both gcc and edg can handle that. 5705 if (!ClassType->isDependentType()) { 5706 DeclarationName Name 5707 = Context.DeclarationNames.getCXXDestructorName( 5708 Context.getCanonicalType(ClassType)); 5709 if (NewFD->getDeclName() != Name) { 5710 Diag(NewFD->getLocation(), diag::err_destructor_name); 5711 NewFD->setInvalidDecl(); 5712 return Redeclaration; 5713 } 5714 } 5715 } else if (CXXConversionDecl *Conversion 5716 = dyn_cast<CXXConversionDecl>(NewFD)) { 5717 ActOnConversionDeclarator(Conversion); 5718 } 5719 5720 // Find any virtual functions that this function overrides. 5721 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5722 if (!Method->isFunctionTemplateSpecialization() && 5723 !Method->getDescribedFunctionTemplate()) { 5724 if (AddOverriddenMethods(Method->getParent(), Method)) { 5725 // If the function was marked as "static", we have a problem. 5726 if (NewFD->getStorageClass() == SC_Static) { 5727 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5728 << NewFD->getDeclName(); 5729 for (CXXMethodDecl::method_iterator 5730 Overridden = Method->begin_overridden_methods(), 5731 OverriddenEnd = Method->end_overridden_methods(); 5732 Overridden != OverriddenEnd; 5733 ++Overridden) { 5734 Diag((*Overridden)->getLocation(), 5735 diag::note_overridden_virtual_function); 5736 } 5737 } 5738 } 5739 } 5740 } 5741 5742 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5743 if (NewFD->isOverloadedOperator() && 5744 CheckOverloadedOperatorDeclaration(NewFD)) { 5745 NewFD->setInvalidDecl(); 5746 return Redeclaration; 5747 } 5748 5749 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5750 if (NewFD->getLiteralIdentifier() && 5751 CheckLiteralOperatorDeclaration(NewFD)) { 5752 NewFD->setInvalidDecl(); 5753 return Redeclaration; 5754 } 5755 5756 // In C++, check default arguments now that we have merged decls. Unless 5757 // the lexical context is the class, because in this case this is done 5758 // during delayed parsing anyway. 5759 if (!CurContext->isRecord()) 5760 CheckCXXDefaultArguments(NewFD); 5761 5762 // If this function declares a builtin function, check the type of this 5763 // declaration against the expected type for the builtin. 5764 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5765 ASTContext::GetBuiltinTypeError Error; 5766 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5767 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5768 // The type of this function differs from the type of the builtin, 5769 // so forget about the builtin entirely. 5770 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5771 } 5772 } 5773 } 5774 return Redeclaration; 5775} 5776 5777void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5778 // C++ [basic.start.main]p3: A program that declares main to be inline 5779 // or static is ill-formed. 5780 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5781 // shall not appear in a declaration of main. 5782 // static main is not an error under C99, but we should warn about it. 5783 if (FD->getStorageClass() == SC_Static) 5784 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5785 ? diag::err_static_main : diag::warn_static_main) 5786 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5787 if (FD->isInlineSpecified()) 5788 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5789 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5790 5791 QualType T = FD->getType(); 5792 assert(T->isFunctionType() && "function decl is not of function type"); 5793 const FunctionType* FT = T->getAs<FunctionType>(); 5794 5795 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5796 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5797 FD->setInvalidDecl(true); 5798 } 5799 5800 // Treat protoless main() as nullary. 5801 if (isa<FunctionNoProtoType>(FT)) return; 5802 5803 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5804 unsigned nparams = FTP->getNumArgs(); 5805 assert(FD->getNumParams() == nparams); 5806 5807 bool HasExtraParameters = (nparams > 3); 5808 5809 // Darwin passes an undocumented fourth argument of type char**. If 5810 // other platforms start sprouting these, the logic below will start 5811 // getting shifty. 5812 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5813 HasExtraParameters = false; 5814 5815 if (HasExtraParameters) { 5816 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5817 FD->setInvalidDecl(true); 5818 nparams = 3; 5819 } 5820 5821 // FIXME: a lot of the following diagnostics would be improved 5822 // if we had some location information about types. 5823 5824 QualType CharPP = 5825 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5826 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5827 5828 for (unsigned i = 0; i < nparams; ++i) { 5829 QualType AT = FTP->getArgType(i); 5830 5831 bool mismatch = true; 5832 5833 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5834 mismatch = false; 5835 else if (Expected[i] == CharPP) { 5836 // As an extension, the following forms are okay: 5837 // char const ** 5838 // char const * const * 5839 // char * const * 5840 5841 QualifierCollector qs; 5842 const PointerType* PT; 5843 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5844 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5845 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5846 qs.removeConst(); 5847 mismatch = !qs.empty(); 5848 } 5849 } 5850 5851 if (mismatch) { 5852 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5853 // TODO: suggest replacing given type with expected type 5854 FD->setInvalidDecl(true); 5855 } 5856 } 5857 5858 if (nparams == 1 && !FD->isInvalidDecl()) { 5859 Diag(FD->getLocation(), diag::warn_main_one_arg); 5860 } 5861 5862 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5863 Diag(FD->getLocation(), diag::err_main_template_decl); 5864 FD->setInvalidDecl(); 5865 } 5866} 5867 5868bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5869 // FIXME: Need strict checking. In C89, we need to check for 5870 // any assignment, increment, decrement, function-calls, or 5871 // commas outside of a sizeof. In C99, it's the same list, 5872 // except that the aforementioned are allowed in unevaluated 5873 // expressions. Everything else falls under the 5874 // "may accept other forms of constant expressions" exception. 5875 // (We never end up here for C++, so the constant expression 5876 // rules there don't matter.) 5877 if (Init->isConstantInitializer(Context, false)) 5878 return false; 5879 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5880 << Init->getSourceRange(); 5881 return true; 5882} 5883 5884namespace { 5885 // Visits an initialization expression to see if OrigDecl is evaluated in 5886 // its own initialization and throws a warning if it does. 5887 class SelfReferenceChecker 5888 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5889 Sema &S; 5890 Decl *OrigDecl; 5891 bool isRecordType; 5892 bool isPODType; 5893 5894 public: 5895 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5896 5897 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5898 S(S), OrigDecl(OrigDecl) { 5899 isPODType = false; 5900 isRecordType = false; 5901 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5902 isPODType = VD->getType().isPODType(S.Context); 5903 isRecordType = VD->getType()->isRecordType(); 5904 } 5905 } 5906 5907 void VisitExpr(Expr *E) { 5908 if (isa<ObjCMessageExpr>(*E)) return; 5909 if (isRecordType) { 5910 Expr *expr = E; 5911 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5912 ValueDecl *VD = ME->getMemberDecl(); 5913 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5914 expr = ME->getBase(); 5915 } 5916 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5917 HandleDeclRefExpr(DRE); 5918 return; 5919 } 5920 } 5921 Inherited::VisitExpr(E); 5922 } 5923 5924 void VisitMemberExpr(MemberExpr *E) { 5925 if (E->getType()->canDecayToPointerType()) return; 5926 if (isa<FieldDecl>(E->getMemberDecl())) 5927 if (DeclRefExpr *DRE 5928 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5929 HandleDeclRefExpr(DRE); 5930 return; 5931 } 5932 Inherited::VisitMemberExpr(E); 5933 } 5934 5935 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5936 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5937 (isRecordType && E->getCastKind() == CK_NoOp)) { 5938 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5939 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5940 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5941 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5942 HandleDeclRefExpr(DRE); 5943 return; 5944 } 5945 } 5946 Inherited::VisitImplicitCastExpr(E); 5947 } 5948 5949 void VisitUnaryOperator(UnaryOperator *E) { 5950 // For POD record types, addresses of its own members are well-defined. 5951 if (isRecordType && isPODType) return; 5952 Inherited::VisitUnaryOperator(E); 5953 } 5954 5955 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5956 Decl* ReferenceDecl = DRE->getDecl(); 5957 if (OrigDecl != ReferenceDecl) return; 5958 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5959 Sema::NotForRedeclaration); 5960 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5961 S.PDiag(diag::warn_uninit_self_reference_in_init) 5962 << Result.getLookupName() 5963 << OrigDecl->getLocation() 5964 << DRE->getSourceRange()); 5965 } 5966 }; 5967} 5968 5969/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5970void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5971 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5972} 5973 5974/// AddInitializerToDecl - Adds the initializer Init to the 5975/// declaration dcl. If DirectInit is true, this is C++ direct 5976/// initialization rather than copy initialization. 5977void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5978 bool DirectInit, bool TypeMayContainAuto) { 5979 // If there is no declaration, there was an error parsing it. Just ignore 5980 // the initializer. 5981 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5982 return; 5983 5984 // Check for self-references within variable initializers. 5985 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5986 // Variables declared within a function/method body are handled 5987 // by a dataflow analysis. 5988 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5989 CheckSelfReference(RealDecl, Init); 5990 } 5991 else { 5992 CheckSelfReference(RealDecl, Init); 5993 } 5994 5995 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5996 // With declarators parsed the way they are, the parser cannot 5997 // distinguish between a normal initializer and a pure-specifier. 5998 // Thus this grotesque test. 5999 IntegerLiteral *IL; 6000 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6001 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6002 CheckPureMethod(Method, Init->getSourceRange()); 6003 else { 6004 Diag(Method->getLocation(), diag::err_member_function_initialization) 6005 << Method->getDeclName() << Init->getSourceRange(); 6006 Method->setInvalidDecl(); 6007 } 6008 return; 6009 } 6010 6011 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6012 if (!VDecl) { 6013 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6014 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6015 RealDecl->setInvalidDecl(); 6016 return; 6017 } 6018 6019 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6020 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6021 TypeSourceInfo *DeducedType = 0; 6022 if (DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType) == 6023 DAR_Failed) 6024 DiagnoseAutoDeductionFailure(VDecl, Init); 6025 if (!DeducedType) { 6026 RealDecl->setInvalidDecl(); 6027 return; 6028 } 6029 VDecl->setTypeSourceInfo(DeducedType); 6030 VDecl->setType(DeducedType->getType()); 6031 6032 // In ARC, infer lifetime. 6033 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6034 VDecl->setInvalidDecl(); 6035 6036 // If this is a redeclaration, check that the type we just deduced matches 6037 // the previously declared type. 6038 if (VarDecl *Old = VDecl->getPreviousDecl()) 6039 MergeVarDeclTypes(VDecl, Old); 6040 } 6041 6042 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6043 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6044 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6045 VDecl->setInvalidDecl(); 6046 return; 6047 } 6048 6049 6050 // A definition must end up with a complete type, which means it must be 6051 // complete with the restriction that an array type might be completed by the 6052 // initializer; note that later code assumes this restriction. 6053 QualType BaseDeclType = VDecl->getType(); 6054 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6055 BaseDeclType = Array->getElementType(); 6056 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6057 diag::err_typecheck_decl_incomplete_type)) { 6058 RealDecl->setInvalidDecl(); 6059 return; 6060 } 6061 6062 // The variable can not have an abstract class type. 6063 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6064 diag::err_abstract_type_in_decl, 6065 AbstractVariableType)) 6066 VDecl->setInvalidDecl(); 6067 6068 const VarDecl *Def; 6069 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6070 Diag(VDecl->getLocation(), diag::err_redefinition) 6071 << VDecl->getDeclName(); 6072 Diag(Def->getLocation(), diag::note_previous_definition); 6073 VDecl->setInvalidDecl(); 6074 return; 6075 } 6076 6077 const VarDecl* PrevInit = 0; 6078 if (getLangOptions().CPlusPlus) { 6079 // C++ [class.static.data]p4 6080 // If a static data member is of const integral or const 6081 // enumeration type, its declaration in the class definition can 6082 // specify a constant-initializer which shall be an integral 6083 // constant expression (5.19). In that case, the member can appear 6084 // in integral constant expressions. The member shall still be 6085 // defined in a namespace scope if it is used in the program and the 6086 // namespace scope definition shall not contain an initializer. 6087 // 6088 // We already performed a redefinition check above, but for static 6089 // data members we also need to check whether there was an in-class 6090 // declaration with an initializer. 6091 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6092 Diag(VDecl->getLocation(), diag::err_redefinition) 6093 << VDecl->getDeclName(); 6094 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6095 return; 6096 } 6097 6098 if (VDecl->hasLocalStorage()) 6099 getCurFunction()->setHasBranchProtectedScope(); 6100 6101 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6102 VDecl->setInvalidDecl(); 6103 return; 6104 } 6105 } 6106 6107 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6108 // a kernel function cannot be initialized." 6109 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6110 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6111 VDecl->setInvalidDecl(); 6112 return; 6113 } 6114 6115 // Get the decls type and save a reference for later, since 6116 // CheckInitializerTypes may change it. 6117 QualType DclT = VDecl->getType(), SavT = DclT; 6118 6119 // Perform the initialization. 6120 if (!VDecl->isInvalidDecl()) { 6121 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6122 InitializationKind Kind 6123 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6124 Init->getLocStart(), 6125 Init->getLocEnd()) 6126 : InitializationKind::CreateCopy(VDecl->getLocation(), 6127 Init->getLocStart()); 6128 6129 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6130 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6131 MultiExprArg(*this, &Init, 1), 6132 &DclT); 6133 if (Result.isInvalid()) { 6134 VDecl->setInvalidDecl(); 6135 return; 6136 } 6137 6138 Init = Result.takeAs<Expr>(); 6139 } 6140 6141 // If the type changed, it means we had an incomplete type that was 6142 // completed by the initializer. For example: 6143 // int ary[] = { 1, 3, 5 }; 6144 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6145 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6146 VDecl->setType(DclT); 6147 Init->setType(DclT.getNonReferenceType()); 6148 } 6149 6150 // Check any implicit conversions within the expression. 6151 CheckImplicitConversions(Init, VDecl->getLocation()); 6152 6153 if (!VDecl->isInvalidDecl()) 6154 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6155 6156 Init = MaybeCreateExprWithCleanups(Init); 6157 // Attach the initializer to the decl. 6158 VDecl->setInit(Init); 6159 6160 if (VDecl->isLocalVarDecl()) { 6161 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6162 // static storage duration shall be constant expressions or string literals. 6163 // C++ does not have this restriction. 6164 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6165 VDecl->getStorageClass() == SC_Static) 6166 CheckForConstantInitializer(Init, DclT); 6167 } else if (VDecl->isStaticDataMember() && 6168 VDecl->getLexicalDeclContext()->isRecord()) { 6169 // This is an in-class initialization for a static data member, e.g., 6170 // 6171 // struct S { 6172 // static const int value = 17; 6173 // }; 6174 6175 // C++ [class.mem]p4: 6176 // A member-declarator can contain a constant-initializer only 6177 // if it declares a static member (9.4) of const integral or 6178 // const enumeration type, see 9.4.2. 6179 // 6180 // C++11 [class.static.data]p3: 6181 // If a non-volatile const static data member is of integral or 6182 // enumeration type, its declaration in the class definition can 6183 // specify a brace-or-equal-initializer in which every initalizer-clause 6184 // that is an assignment-expression is a constant expression. A static 6185 // data member of literal type can be declared in the class definition 6186 // with the constexpr specifier; if so, its declaration shall specify a 6187 // brace-or-equal-initializer in which every initializer-clause that is 6188 // an assignment-expression is a constant expression. 6189 6190 // Do nothing on dependent types. 6191 if (DclT->isDependentType()) { 6192 6193 // Allow any 'static constexpr' members, whether or not they are of literal 6194 // type. We separately check that the initializer is a constant expression, 6195 // which implicitly requires the member to be of literal type. 6196 } else if (VDecl->isConstexpr()) { 6197 6198 // Require constness. 6199 } else if (!DclT.isConstQualified()) { 6200 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6201 << Init->getSourceRange(); 6202 VDecl->setInvalidDecl(); 6203 6204 // We allow integer constant expressions in all cases. 6205 } else if (DclT->isIntegralOrEnumerationType()) { 6206 // Check whether the expression is a constant expression. 6207 SourceLocation Loc; 6208 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6209 // In C++11, a non-constexpr const static data member with an 6210 // in-class initializer cannot be volatile. 6211 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6212 else if (Init->isValueDependent()) 6213 ; // Nothing to check. 6214 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6215 ; // Ok, it's an ICE! 6216 else if (Init->isEvaluatable(Context)) { 6217 // If we can constant fold the initializer through heroics, accept it, 6218 // but report this as a use of an extension for -pedantic. 6219 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6220 << Init->getSourceRange(); 6221 } else { 6222 // Otherwise, this is some crazy unknown case. Report the issue at the 6223 // location provided by the isIntegerConstantExpr failed check. 6224 Diag(Loc, diag::err_in_class_initializer_non_constant) 6225 << Init->getSourceRange(); 6226 VDecl->setInvalidDecl(); 6227 } 6228 6229 // We allow foldable floating-point constants as an extension. 6230 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6231 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6232 << DclT << Init->getSourceRange(); 6233 if (getLangOptions().CPlusPlus0x) 6234 Diag(VDecl->getLocation(), 6235 diag::note_in_class_initializer_float_type_constexpr) 6236 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6237 6238 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6239 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6240 << Init->getSourceRange(); 6241 VDecl->setInvalidDecl(); 6242 } 6243 6244 // Suggest adding 'constexpr' in C++11 for literal types. 6245 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6246 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6247 << DclT << Init->getSourceRange() 6248 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6249 VDecl->setConstexpr(true); 6250 6251 } else { 6252 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6253 << DclT << Init->getSourceRange(); 6254 VDecl->setInvalidDecl(); 6255 } 6256 } else if (VDecl->isFileVarDecl()) { 6257 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6258 (!getLangOptions().CPlusPlus || 6259 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6260 Diag(VDecl->getLocation(), diag::warn_extern_init); 6261 6262 // C99 6.7.8p4. All file scoped initializers need to be constant. 6263 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6264 CheckForConstantInitializer(Init, DclT); 6265 } 6266 6267 CheckCompleteVariableDeclaration(VDecl); 6268} 6269 6270/// ActOnInitializerError - Given that there was an error parsing an 6271/// initializer for the given declaration, try to return to some form 6272/// of sanity. 6273void Sema::ActOnInitializerError(Decl *D) { 6274 // Our main concern here is re-establishing invariants like "a 6275 // variable's type is either dependent or complete". 6276 if (!D || D->isInvalidDecl()) return; 6277 6278 VarDecl *VD = dyn_cast<VarDecl>(D); 6279 if (!VD) return; 6280 6281 // Auto types are meaningless if we can't make sense of the initializer. 6282 if (ParsingInitForAutoVars.count(D)) { 6283 D->setInvalidDecl(); 6284 return; 6285 } 6286 6287 QualType Ty = VD->getType(); 6288 if (Ty->isDependentType()) return; 6289 6290 // Require a complete type. 6291 if (RequireCompleteType(VD->getLocation(), 6292 Context.getBaseElementType(Ty), 6293 diag::err_typecheck_decl_incomplete_type)) { 6294 VD->setInvalidDecl(); 6295 return; 6296 } 6297 6298 // Require an abstract type. 6299 if (RequireNonAbstractType(VD->getLocation(), Ty, 6300 diag::err_abstract_type_in_decl, 6301 AbstractVariableType)) { 6302 VD->setInvalidDecl(); 6303 return; 6304 } 6305 6306 // Don't bother complaining about constructors or destructors, 6307 // though. 6308} 6309 6310void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6311 bool TypeMayContainAuto) { 6312 // If there is no declaration, there was an error parsing it. Just ignore it. 6313 if (RealDecl == 0) 6314 return; 6315 6316 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6317 QualType Type = Var->getType(); 6318 6319 // C++11 [dcl.spec.auto]p3 6320 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6321 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6322 << Var->getDeclName() << Type; 6323 Var->setInvalidDecl(); 6324 return; 6325 } 6326 6327 // C++11 [class.static.data]p3: A static data member can be declared with 6328 // the constexpr specifier; if so, its declaration shall specify 6329 // a brace-or-equal-initializer. 6330 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6331 // the definition of a variable [...] or the declaration of a static data 6332 // member. 6333 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6334 if (Var->isStaticDataMember()) 6335 Diag(Var->getLocation(), 6336 diag::err_constexpr_static_mem_var_requires_init) 6337 << Var->getDeclName(); 6338 else 6339 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6340 Var->setInvalidDecl(); 6341 return; 6342 } 6343 6344 switch (Var->isThisDeclarationADefinition()) { 6345 case VarDecl::Definition: 6346 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6347 break; 6348 6349 // We have an out-of-line definition of a static data member 6350 // that has an in-class initializer, so we type-check this like 6351 // a declaration. 6352 // 6353 // Fall through 6354 6355 case VarDecl::DeclarationOnly: 6356 // It's only a declaration. 6357 6358 // Block scope. C99 6.7p7: If an identifier for an object is 6359 // declared with no linkage (C99 6.2.2p6), the type for the 6360 // object shall be complete. 6361 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6362 !Var->getLinkage() && !Var->isInvalidDecl() && 6363 RequireCompleteType(Var->getLocation(), Type, 6364 diag::err_typecheck_decl_incomplete_type)) 6365 Var->setInvalidDecl(); 6366 6367 // Make sure that the type is not abstract. 6368 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6369 RequireNonAbstractType(Var->getLocation(), Type, 6370 diag::err_abstract_type_in_decl, 6371 AbstractVariableType)) 6372 Var->setInvalidDecl(); 6373 return; 6374 6375 case VarDecl::TentativeDefinition: 6376 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6377 // object that has file scope without an initializer, and without a 6378 // storage-class specifier or with the storage-class specifier "static", 6379 // constitutes a tentative definition. Note: A tentative definition with 6380 // external linkage is valid (C99 6.2.2p5). 6381 if (!Var->isInvalidDecl()) { 6382 if (const IncompleteArrayType *ArrayT 6383 = Context.getAsIncompleteArrayType(Type)) { 6384 if (RequireCompleteType(Var->getLocation(), 6385 ArrayT->getElementType(), 6386 diag::err_illegal_decl_array_incomplete_type)) 6387 Var->setInvalidDecl(); 6388 } else if (Var->getStorageClass() == SC_Static) { 6389 // C99 6.9.2p3: If the declaration of an identifier for an object is 6390 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6391 // declared type shall not be an incomplete type. 6392 // NOTE: code such as the following 6393 // static struct s; 6394 // struct s { int a; }; 6395 // is accepted by gcc. Hence here we issue a warning instead of 6396 // an error and we do not invalidate the static declaration. 6397 // NOTE: to avoid multiple warnings, only check the first declaration. 6398 if (Var->getPreviousDecl() == 0) 6399 RequireCompleteType(Var->getLocation(), Type, 6400 diag::ext_typecheck_decl_incomplete_type); 6401 } 6402 } 6403 6404 // Record the tentative definition; we're done. 6405 if (!Var->isInvalidDecl()) 6406 TentativeDefinitions.push_back(Var); 6407 return; 6408 } 6409 6410 // Provide a specific diagnostic for uninitialized variable 6411 // definitions with incomplete array type. 6412 if (Type->isIncompleteArrayType()) { 6413 Diag(Var->getLocation(), 6414 diag::err_typecheck_incomplete_array_needs_initializer); 6415 Var->setInvalidDecl(); 6416 return; 6417 } 6418 6419 // Provide a specific diagnostic for uninitialized variable 6420 // definitions with reference type. 6421 if (Type->isReferenceType()) { 6422 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6423 << Var->getDeclName() 6424 << SourceRange(Var->getLocation(), Var->getLocation()); 6425 Var->setInvalidDecl(); 6426 return; 6427 } 6428 6429 // Do not attempt to type-check the default initializer for a 6430 // variable with dependent type. 6431 if (Type->isDependentType()) 6432 return; 6433 6434 if (Var->isInvalidDecl()) 6435 return; 6436 6437 if (RequireCompleteType(Var->getLocation(), 6438 Context.getBaseElementType(Type), 6439 diag::err_typecheck_decl_incomplete_type)) { 6440 Var->setInvalidDecl(); 6441 return; 6442 } 6443 6444 // The variable can not have an abstract class type. 6445 if (RequireNonAbstractType(Var->getLocation(), Type, 6446 diag::err_abstract_type_in_decl, 6447 AbstractVariableType)) { 6448 Var->setInvalidDecl(); 6449 return; 6450 } 6451 6452 // Check for jumps past the implicit initializer. C++0x 6453 // clarifies that this applies to a "variable with automatic 6454 // storage duration", not a "local variable". 6455 // C++11 [stmt.dcl]p3 6456 // A program that jumps from a point where a variable with automatic 6457 // storage duration is not in scope to a point where it is in scope is 6458 // ill-formed unless the variable has scalar type, class type with a 6459 // trivial default constructor and a trivial destructor, a cv-qualified 6460 // version of one of these types, or an array of one of the preceding 6461 // types and is declared without an initializer. 6462 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6463 if (const RecordType *Record 6464 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6465 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6466 // Mark the function for further checking even if the looser rules of 6467 // C++11 do not require such checks, so that we can diagnose 6468 // incompatibilities with C++98. 6469 if (!CXXRecord->isPOD()) 6470 getCurFunction()->setHasBranchProtectedScope(); 6471 } 6472 } 6473 6474 // C++03 [dcl.init]p9: 6475 // If no initializer is specified for an object, and the 6476 // object is of (possibly cv-qualified) non-POD class type (or 6477 // array thereof), the object shall be default-initialized; if 6478 // the object is of const-qualified type, the underlying class 6479 // type shall have a user-declared default 6480 // constructor. Otherwise, if no initializer is specified for 6481 // a non- static object, the object and its subobjects, if 6482 // any, have an indeterminate initial value); if the object 6483 // or any of its subobjects are of const-qualified type, the 6484 // program is ill-formed. 6485 // C++0x [dcl.init]p11: 6486 // If no initializer is specified for an object, the object is 6487 // default-initialized; [...]. 6488 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6489 InitializationKind Kind 6490 = InitializationKind::CreateDefault(Var->getLocation()); 6491 6492 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6493 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6494 MultiExprArg(*this, 0, 0)); 6495 if (Init.isInvalid()) 6496 Var->setInvalidDecl(); 6497 else if (Init.get()) 6498 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6499 6500 CheckCompleteVariableDeclaration(Var); 6501 } 6502} 6503 6504void Sema::ActOnCXXForRangeDecl(Decl *D) { 6505 VarDecl *VD = dyn_cast<VarDecl>(D); 6506 if (!VD) { 6507 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6508 D->setInvalidDecl(); 6509 return; 6510 } 6511 6512 VD->setCXXForRangeDecl(true); 6513 6514 // for-range-declaration cannot be given a storage class specifier. 6515 int Error = -1; 6516 switch (VD->getStorageClassAsWritten()) { 6517 case SC_None: 6518 break; 6519 case SC_Extern: 6520 Error = 0; 6521 break; 6522 case SC_Static: 6523 Error = 1; 6524 break; 6525 case SC_PrivateExtern: 6526 Error = 2; 6527 break; 6528 case SC_Auto: 6529 Error = 3; 6530 break; 6531 case SC_Register: 6532 Error = 4; 6533 break; 6534 case SC_OpenCLWorkGroupLocal: 6535 llvm_unreachable("Unexpected storage class"); 6536 } 6537 if (VD->isConstexpr()) 6538 Error = 5; 6539 if (Error != -1) { 6540 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6541 << VD->getDeclName() << Error; 6542 D->setInvalidDecl(); 6543 } 6544} 6545 6546void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6547 if (var->isInvalidDecl()) return; 6548 6549 // In ARC, don't allow jumps past the implicit initialization of a 6550 // local retaining variable. 6551 if (getLangOptions().ObjCAutoRefCount && 6552 var->hasLocalStorage()) { 6553 switch (var->getType().getObjCLifetime()) { 6554 case Qualifiers::OCL_None: 6555 case Qualifiers::OCL_ExplicitNone: 6556 case Qualifiers::OCL_Autoreleasing: 6557 break; 6558 6559 case Qualifiers::OCL_Weak: 6560 case Qualifiers::OCL_Strong: 6561 getCurFunction()->setHasBranchProtectedScope(); 6562 break; 6563 } 6564 } 6565 6566 // All the following checks are C++ only. 6567 if (!getLangOptions().CPlusPlus) return; 6568 6569 QualType baseType = Context.getBaseElementType(var->getType()); 6570 if (baseType->isDependentType()) return; 6571 6572 // __block variables might require us to capture a copy-initializer. 6573 if (var->hasAttr<BlocksAttr>()) { 6574 // It's currently invalid to ever have a __block variable with an 6575 // array type; should we diagnose that here? 6576 6577 // Regardless, we don't want to ignore array nesting when 6578 // constructing this copy. 6579 QualType type = var->getType(); 6580 6581 if (type->isStructureOrClassType()) { 6582 SourceLocation poi = var->getLocation(); 6583 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6584 ExprResult result = 6585 PerformCopyInitialization( 6586 InitializedEntity::InitializeBlock(poi, type, false), 6587 poi, Owned(varRef)); 6588 if (!result.isInvalid()) { 6589 result = MaybeCreateExprWithCleanups(result); 6590 Expr *init = result.takeAs<Expr>(); 6591 Context.setBlockVarCopyInits(var, init); 6592 } 6593 } 6594 } 6595 6596 Expr *Init = var->getInit(); 6597 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6598 6599 if (!var->getDeclContext()->isDependentContext() && Init) { 6600 if (IsGlobal && !var->isConstexpr() && 6601 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6602 var->getLocation()) 6603 != DiagnosticsEngine::Ignored && 6604 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6605 Diag(var->getLocation(), diag::warn_global_constructor) 6606 << Init->getSourceRange(); 6607 6608 if (var->isConstexpr()) { 6609 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6610 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6611 SourceLocation DiagLoc = var->getLocation(); 6612 // If the note doesn't add any useful information other than a source 6613 // location, fold it into the primary diagnostic. 6614 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6615 diag::note_invalid_subexpr_in_const_expr) { 6616 DiagLoc = Notes[0].first; 6617 Notes.clear(); 6618 } 6619 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6620 << var << Init->getSourceRange(); 6621 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6622 Diag(Notes[I].first, Notes[I].second); 6623 } 6624 } else if (var->isUsableInConstantExpressions()) { 6625 // Check whether the initializer of a const variable of integral or 6626 // enumeration type is an ICE now, since we can't tell whether it was 6627 // initialized by a constant expression if we check later. 6628 var->checkInitIsICE(); 6629 } 6630 } 6631 6632 // Require the destructor. 6633 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6634 FinalizeVarWithDestructor(var, recordType); 6635} 6636 6637/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6638/// any semantic actions necessary after any initializer has been attached. 6639void 6640Sema::FinalizeDeclaration(Decl *ThisDecl) { 6641 // Note that we are no longer parsing the initializer for this declaration. 6642 ParsingInitForAutoVars.erase(ThisDecl); 6643} 6644 6645Sema::DeclGroupPtrTy 6646Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6647 Decl **Group, unsigned NumDecls) { 6648 SmallVector<Decl*, 8> Decls; 6649 6650 if (DS.isTypeSpecOwned()) 6651 Decls.push_back(DS.getRepAsDecl()); 6652 6653 for (unsigned i = 0; i != NumDecls; ++i) 6654 if (Decl *D = Group[i]) 6655 Decls.push_back(D); 6656 6657 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6658 DS.getTypeSpecType() == DeclSpec::TST_auto); 6659} 6660 6661/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6662/// group, performing any necessary semantic checking. 6663Sema::DeclGroupPtrTy 6664Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6665 bool TypeMayContainAuto) { 6666 // C++0x [dcl.spec.auto]p7: 6667 // If the type deduced for the template parameter U is not the same in each 6668 // deduction, the program is ill-formed. 6669 // FIXME: When initializer-list support is added, a distinction is needed 6670 // between the deduced type U and the deduced type which 'auto' stands for. 6671 // auto a = 0, b = { 1, 2, 3 }; 6672 // is legal because the deduced type U is 'int' in both cases. 6673 if (TypeMayContainAuto && NumDecls > 1) { 6674 QualType Deduced; 6675 CanQualType DeducedCanon; 6676 VarDecl *DeducedDecl = 0; 6677 for (unsigned i = 0; i != NumDecls; ++i) { 6678 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6679 AutoType *AT = D->getType()->getContainedAutoType(); 6680 // Don't reissue diagnostics when instantiating a template. 6681 if (AT && D->isInvalidDecl()) 6682 break; 6683 if (AT && AT->isDeduced()) { 6684 QualType U = AT->getDeducedType(); 6685 CanQualType UCanon = Context.getCanonicalType(U); 6686 if (Deduced.isNull()) { 6687 Deduced = U; 6688 DeducedCanon = UCanon; 6689 DeducedDecl = D; 6690 } else if (DeducedCanon != UCanon) { 6691 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6692 diag::err_auto_different_deductions) 6693 << Deduced << DeducedDecl->getDeclName() 6694 << U << D->getDeclName() 6695 << DeducedDecl->getInit()->getSourceRange() 6696 << D->getInit()->getSourceRange(); 6697 D->setInvalidDecl(); 6698 break; 6699 } 6700 } 6701 } 6702 } 6703 } 6704 6705 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6706} 6707 6708 6709/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6710/// to introduce parameters into function prototype scope. 6711Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6712 const DeclSpec &DS = D.getDeclSpec(); 6713 6714 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6715 // C++03 [dcl.stc]p2 also permits 'auto'. 6716 VarDecl::StorageClass StorageClass = SC_None; 6717 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6718 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6719 StorageClass = SC_Register; 6720 StorageClassAsWritten = SC_Register; 6721 } else if (getLangOptions().CPlusPlus && 6722 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6723 StorageClass = SC_Auto; 6724 StorageClassAsWritten = SC_Auto; 6725 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6726 Diag(DS.getStorageClassSpecLoc(), 6727 diag::err_invalid_storage_class_in_func_decl); 6728 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6729 } 6730 6731 if (D.getDeclSpec().isThreadSpecified()) 6732 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6733 if (D.getDeclSpec().isConstexprSpecified()) 6734 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6735 << 0; 6736 6737 DiagnoseFunctionSpecifiers(D); 6738 6739 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6740 QualType parmDeclType = TInfo->getType(); 6741 6742 if (getLangOptions().CPlusPlus) { 6743 // Check that there are no default arguments inside the type of this 6744 // parameter. 6745 CheckExtraCXXDefaultArguments(D); 6746 6747 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6748 if (D.getCXXScopeSpec().isSet()) { 6749 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6750 << D.getCXXScopeSpec().getRange(); 6751 D.getCXXScopeSpec().clear(); 6752 } 6753 } 6754 6755 // Ensure we have a valid name 6756 IdentifierInfo *II = 0; 6757 if (D.hasName()) { 6758 II = D.getIdentifier(); 6759 if (!II) { 6760 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6761 << GetNameForDeclarator(D).getName().getAsString(); 6762 D.setInvalidType(true); 6763 } 6764 } 6765 6766 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6767 if (II) { 6768 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6769 ForRedeclaration); 6770 LookupName(R, S); 6771 if (R.isSingleResult()) { 6772 NamedDecl *PrevDecl = R.getFoundDecl(); 6773 if (PrevDecl->isTemplateParameter()) { 6774 // Maybe we will complain about the shadowed template parameter. 6775 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6776 // Just pretend that we didn't see the previous declaration. 6777 PrevDecl = 0; 6778 } else if (S->isDeclScope(PrevDecl)) { 6779 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6780 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6781 6782 // Recover by removing the name 6783 II = 0; 6784 D.SetIdentifier(0, D.getIdentifierLoc()); 6785 D.setInvalidType(true); 6786 } 6787 } 6788 } 6789 6790 // Temporarily put parameter variables in the translation unit, not 6791 // the enclosing context. This prevents them from accidentally 6792 // looking like class members in C++. 6793 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6794 D.getSourceRange().getBegin(), 6795 D.getIdentifierLoc(), II, 6796 parmDeclType, TInfo, 6797 StorageClass, StorageClassAsWritten); 6798 6799 if (D.isInvalidType()) 6800 New->setInvalidDecl(); 6801 6802 assert(S->isFunctionPrototypeScope()); 6803 assert(S->getFunctionPrototypeDepth() >= 1); 6804 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6805 S->getNextFunctionPrototypeIndex()); 6806 6807 // Add the parameter declaration into this scope. 6808 S->AddDecl(New); 6809 if (II) 6810 IdResolver.AddDecl(New); 6811 6812 ProcessDeclAttributes(S, New, D); 6813 6814 if (D.getDeclSpec().isModulePrivateSpecified()) 6815 Diag(New->getLocation(), diag::err_module_private_local) 6816 << 1 << New->getDeclName() 6817 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6818 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6819 6820 if (New->hasAttr<BlocksAttr>()) { 6821 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6822 } 6823 return New; 6824} 6825 6826/// \brief Synthesizes a variable for a parameter arising from a 6827/// typedef. 6828ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6829 SourceLocation Loc, 6830 QualType T) { 6831 /* FIXME: setting StartLoc == Loc. 6832 Would it be worth to modify callers so as to provide proper source 6833 location for the unnamed parameters, embedding the parameter's type? */ 6834 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6835 T, Context.getTrivialTypeSourceInfo(T, Loc), 6836 SC_None, SC_None, 0); 6837 Param->setImplicit(); 6838 return Param; 6839} 6840 6841void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6842 ParmVarDecl * const *ParamEnd) { 6843 // Don't diagnose unused-parameter errors in template instantiations; we 6844 // will already have done so in the template itself. 6845 if (!ActiveTemplateInstantiations.empty()) 6846 return; 6847 6848 for (; Param != ParamEnd; ++Param) { 6849 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 6850 !(*Param)->hasAttr<UnusedAttr>()) { 6851 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6852 << (*Param)->getDeclName(); 6853 } 6854 } 6855} 6856 6857void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6858 ParmVarDecl * const *ParamEnd, 6859 QualType ReturnTy, 6860 NamedDecl *D) { 6861 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6862 return; 6863 6864 // Warn if the return value is pass-by-value and larger than the specified 6865 // threshold. 6866 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 6867 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6868 if (Size > LangOpts.NumLargeByValueCopy) 6869 Diag(D->getLocation(), diag::warn_return_value_size) 6870 << D->getDeclName() << Size; 6871 } 6872 6873 // Warn if any parameter is pass-by-value and larger than the specified 6874 // threshold. 6875 for (; Param != ParamEnd; ++Param) { 6876 QualType T = (*Param)->getType(); 6877 if (T->isDependentType() || !T.isPODType(Context)) 6878 continue; 6879 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6880 if (Size > LangOpts.NumLargeByValueCopy) 6881 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6882 << (*Param)->getDeclName() << Size; 6883 } 6884} 6885 6886ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6887 SourceLocation NameLoc, IdentifierInfo *Name, 6888 QualType T, TypeSourceInfo *TSInfo, 6889 VarDecl::StorageClass StorageClass, 6890 VarDecl::StorageClass StorageClassAsWritten) { 6891 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6892 if (getLangOptions().ObjCAutoRefCount && 6893 T.getObjCLifetime() == Qualifiers::OCL_None && 6894 T->isObjCLifetimeType()) { 6895 6896 Qualifiers::ObjCLifetime lifetime; 6897 6898 // Special cases for arrays: 6899 // - if it's const, use __unsafe_unretained 6900 // - otherwise, it's an error 6901 if (T->isArrayType()) { 6902 if (!T.isConstQualified()) { 6903 DelayedDiagnostics.add( 6904 sema::DelayedDiagnostic::makeForbiddenType( 6905 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6906 } 6907 lifetime = Qualifiers::OCL_ExplicitNone; 6908 } else { 6909 lifetime = T->getObjCARCImplicitLifetime(); 6910 } 6911 T = Context.getLifetimeQualifiedType(T, lifetime); 6912 } 6913 6914 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6915 Context.getAdjustedParameterType(T), 6916 TSInfo, 6917 StorageClass, StorageClassAsWritten, 6918 0); 6919 6920 // Parameters can not be abstract class types. 6921 // For record types, this is done by the AbstractClassUsageDiagnoser once 6922 // the class has been completely parsed. 6923 if (!CurContext->isRecord() && 6924 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6925 AbstractParamType)) 6926 New->setInvalidDecl(); 6927 6928 // Parameter declarators cannot be interface types. All ObjC objects are 6929 // passed by reference. 6930 if (T->isObjCObjectType()) { 6931 Diag(NameLoc, 6932 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6933 << FixItHint::CreateInsertion(NameLoc, "*"); 6934 T = Context.getObjCObjectPointerType(T); 6935 New->setType(T); 6936 } 6937 6938 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6939 // duration shall not be qualified by an address-space qualifier." 6940 // Since all parameters have automatic store duration, they can not have 6941 // an address space. 6942 if (T.getAddressSpace() != 0) { 6943 Diag(NameLoc, diag::err_arg_with_address_space); 6944 New->setInvalidDecl(); 6945 } 6946 6947 return New; 6948} 6949 6950void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6951 SourceLocation LocAfterDecls) { 6952 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6953 6954 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6955 // for a K&R function. 6956 if (!FTI.hasPrototype) { 6957 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6958 --i; 6959 if (FTI.ArgInfo[i].Param == 0) { 6960 llvm::SmallString<256> Code; 6961 llvm::raw_svector_ostream(Code) << " int " 6962 << FTI.ArgInfo[i].Ident->getName() 6963 << ";\n"; 6964 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6965 << FTI.ArgInfo[i].Ident 6966 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6967 6968 // Implicitly declare the argument as type 'int' for lack of a better 6969 // type. 6970 AttributeFactory attrs; 6971 DeclSpec DS(attrs); 6972 const char* PrevSpec; // unused 6973 unsigned DiagID; // unused 6974 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6975 PrevSpec, DiagID); 6976 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6977 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6978 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6979 } 6980 } 6981 } 6982} 6983 6984Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6985 Declarator &D) { 6986 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6987 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6988 Scope *ParentScope = FnBodyScope->getParent(); 6989 6990 D.setFunctionDefinitionKind(FDK_Definition); 6991 Decl *DP = HandleDeclarator(ParentScope, D, 6992 MultiTemplateParamsArg(*this)); 6993 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6994} 6995 6996static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6997 // Don't warn about invalid declarations. 6998 if (FD->isInvalidDecl()) 6999 return false; 7000 7001 // Or declarations that aren't global. 7002 if (!FD->isGlobal()) 7003 return false; 7004 7005 // Don't warn about C++ member functions. 7006 if (isa<CXXMethodDecl>(FD)) 7007 return false; 7008 7009 // Don't warn about 'main'. 7010 if (FD->isMain()) 7011 return false; 7012 7013 // Don't warn about inline functions. 7014 if (FD->isInlined()) 7015 return false; 7016 7017 // Don't warn about function templates. 7018 if (FD->getDescribedFunctionTemplate()) 7019 return false; 7020 7021 // Don't warn about function template specializations. 7022 if (FD->isFunctionTemplateSpecialization()) 7023 return false; 7024 7025 bool MissingPrototype = true; 7026 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7027 Prev; Prev = Prev->getPreviousDecl()) { 7028 // Ignore any declarations that occur in function or method 7029 // scope, because they aren't visible from the header. 7030 if (Prev->getDeclContext()->isFunctionOrMethod()) 7031 continue; 7032 7033 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7034 break; 7035 } 7036 7037 return MissingPrototype; 7038} 7039 7040void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7041 // Don't complain if we're in GNU89 mode and the previous definition 7042 // was an extern inline function. 7043 const FunctionDecl *Definition; 7044 if (FD->isDefined(Definition) && 7045 !canRedefineFunction(Definition, getLangOptions())) { 7046 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 7047 Definition->getStorageClass() == SC_Extern) 7048 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7049 << FD->getDeclName() << getLangOptions().CPlusPlus; 7050 else 7051 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7052 Diag(Definition->getLocation(), diag::note_previous_definition); 7053 } 7054} 7055 7056Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7057 // Clear the last template instantiation error context. 7058 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7059 7060 if (!D) 7061 return D; 7062 FunctionDecl *FD = 0; 7063 7064 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7065 FD = FunTmpl->getTemplatedDecl(); 7066 else 7067 FD = cast<FunctionDecl>(D); 7068 7069 // Enter a new function scope 7070 PushFunctionScope(); 7071 7072 // See if this is a redefinition. 7073 if (!FD->isLateTemplateParsed()) 7074 CheckForFunctionRedefinition(FD); 7075 7076 // Builtin functions cannot be defined. 7077 if (unsigned BuiltinID = FD->getBuiltinID()) { 7078 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7079 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7080 FD->setInvalidDecl(); 7081 } 7082 } 7083 7084 // The return type of a function definition must be complete 7085 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7086 QualType ResultType = FD->getResultType(); 7087 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7088 !FD->isInvalidDecl() && 7089 RequireCompleteType(FD->getLocation(), ResultType, 7090 diag::err_func_def_incomplete_result)) 7091 FD->setInvalidDecl(); 7092 7093 // GNU warning -Wmissing-prototypes: 7094 // Warn if a global function is defined without a previous 7095 // prototype declaration. This warning is issued even if the 7096 // definition itself provides a prototype. The aim is to detect 7097 // global functions that fail to be declared in header files. 7098 if (ShouldWarnAboutMissingPrototype(FD)) 7099 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7100 7101 if (FnBodyScope) 7102 PushDeclContext(FnBodyScope, FD); 7103 7104 // Check the validity of our function parameters 7105 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7106 /*CheckParameterNames=*/true); 7107 7108 // Introduce our parameters into the function scope 7109 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7110 ParmVarDecl *Param = FD->getParamDecl(p); 7111 Param->setOwningFunction(FD); 7112 7113 // If this has an identifier, add it to the scope stack. 7114 if (Param->getIdentifier() && FnBodyScope) { 7115 CheckShadow(FnBodyScope, Param); 7116 7117 PushOnScopeChains(Param, FnBodyScope); 7118 } 7119 } 7120 7121 // Checking attributes of current function definition 7122 // dllimport attribute. 7123 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7124 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7125 // dllimport attribute cannot be directly applied to definition. 7126 // Microsoft accepts dllimport for functions defined within class scope. 7127 if (!DA->isInherited() && 7128 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7129 Diag(FD->getLocation(), 7130 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7131 << "dllimport"; 7132 FD->setInvalidDecl(); 7133 return FD; 7134 } 7135 7136 // Visual C++ appears to not think this is an issue, so only issue 7137 // a warning when Microsoft extensions are disabled. 7138 if (!LangOpts.MicrosoftExt) { 7139 // If a symbol previously declared dllimport is later defined, the 7140 // attribute is ignored in subsequent references, and a warning is 7141 // emitted. 7142 Diag(FD->getLocation(), 7143 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7144 << FD->getName() << "dllimport"; 7145 } 7146 } 7147 return FD; 7148} 7149 7150/// \brief Given the set of return statements within a function body, 7151/// compute the variables that are subject to the named return value 7152/// optimization. 7153/// 7154/// Each of the variables that is subject to the named return value 7155/// optimization will be marked as NRVO variables in the AST, and any 7156/// return statement that has a marked NRVO variable as its NRVO candidate can 7157/// use the named return value optimization. 7158/// 7159/// This function applies a very simplistic algorithm for NRVO: if every return 7160/// statement in the function has the same NRVO candidate, that candidate is 7161/// the NRVO variable. 7162/// 7163/// FIXME: Employ a smarter algorithm that accounts for multiple return 7164/// statements and the lifetimes of the NRVO candidates. We should be able to 7165/// find a maximal set of NRVO variables. 7166void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7167 ReturnStmt **Returns = Scope->Returns.data(); 7168 7169 const VarDecl *NRVOCandidate = 0; 7170 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7171 if (!Returns[I]->getNRVOCandidate()) 7172 return; 7173 7174 if (!NRVOCandidate) 7175 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7176 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7177 return; 7178 } 7179 7180 if (NRVOCandidate) 7181 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7182} 7183 7184Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7185 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7186} 7187 7188Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7189 bool IsInstantiation) { 7190 FunctionDecl *FD = 0; 7191 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7192 if (FunTmpl) 7193 FD = FunTmpl->getTemplatedDecl(); 7194 else 7195 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7196 7197 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7198 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7199 7200 if (FD) { 7201 FD->setBody(Body); 7202 if (FD->isMain()) { 7203 // C and C++ allow for main to automagically return 0. 7204 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7205 FD->setHasImplicitReturnZero(true); 7206 WP.disableCheckFallThrough(); 7207 } else if (FD->hasAttr<NakedAttr>()) { 7208 // If the function is marked 'naked', don't complain about missing return 7209 // statements. 7210 WP.disableCheckFallThrough(); 7211 } 7212 7213 // MSVC permits the use of pure specifier (=0) on function definition, 7214 // defined at class scope, warn about this non standard construct. 7215 if (getLangOptions().MicrosoftExt && FD->isPure()) 7216 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7217 7218 if (!FD->isInvalidDecl()) { 7219 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7220 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7221 FD->getResultType(), FD); 7222 7223 // If this is a constructor, we need a vtable. 7224 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7225 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7226 7227 computeNRVO(Body, getCurFunction()); 7228 } 7229 7230 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7231 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7232 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7233 MD->setBody(Body); 7234 if (Body) 7235 MD->setEndLoc(Body->getLocEnd()); 7236 if (!MD->isInvalidDecl()) { 7237 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7238 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7239 MD->getResultType(), MD); 7240 7241 if (Body) 7242 computeNRVO(Body, getCurFunction()); 7243 } 7244 if (ObjCShouldCallSuperDealloc) { 7245 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7246 ObjCShouldCallSuperDealloc = false; 7247 } 7248 if (ObjCShouldCallSuperFinalize) { 7249 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7250 ObjCShouldCallSuperFinalize = false; 7251 } 7252 } else { 7253 return 0; 7254 } 7255 7256 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7257 "ObjC methods, which should have been handled in the block above."); 7258 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7259 "ObjC methods, which should have been handled in the block above."); 7260 7261 // Verify and clean out per-function state. 7262 if (Body) { 7263 // C++ constructors that have function-try-blocks can't have return 7264 // statements in the handlers of that block. (C++ [except.handle]p14) 7265 // Verify this. 7266 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7267 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7268 7269 // Verify that gotos and switch cases don't jump into scopes illegally. 7270 if (getCurFunction()->NeedsScopeChecking() && 7271 !dcl->isInvalidDecl() && 7272 !hasAnyUnrecoverableErrorsInThisFunction()) 7273 DiagnoseInvalidJumps(Body); 7274 7275 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7276 if (!Destructor->getParent()->isDependentType()) 7277 CheckDestructor(Destructor); 7278 7279 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7280 Destructor->getParent()); 7281 } 7282 7283 // If any errors have occurred, clear out any temporaries that may have 7284 // been leftover. This ensures that these temporaries won't be picked up for 7285 // deletion in some later function. 7286 if (PP.getDiagnostics().hasErrorOccurred() || 7287 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7288 DiscardCleanupsInEvaluationContext(); 7289 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7290 // Since the body is valid, issue any analysis-based warnings that are 7291 // enabled. 7292 ActivePolicy = &WP; 7293 } 7294 7295 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7296 !CheckConstexprFunctionBody(FD, Body)) 7297 FD->setInvalidDecl(); 7298 7299 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7300 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7301 } 7302 7303 if (!IsInstantiation) 7304 PopDeclContext(); 7305 7306 PopFunctionScopeInfo(ActivePolicy, dcl); 7307 7308 // If any errors have occurred, clear out any temporaries that may have 7309 // been leftover. This ensures that these temporaries won't be picked up for 7310 // deletion in some later function. 7311 if (getDiagnostics().hasErrorOccurred()) { 7312 DiscardCleanupsInEvaluationContext(); 7313 } 7314 7315 return dcl; 7316} 7317 7318 7319/// When we finish delayed parsing of an attribute, we must attach it to the 7320/// relevant Decl. 7321void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7322 ParsedAttributes &Attrs) { 7323 // Always attach attributes to the underlying decl. 7324 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7325 D = TD->getTemplatedDecl(); 7326 ProcessDeclAttributeList(S, D, Attrs.getList()); 7327} 7328 7329 7330/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7331/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7332NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7333 IdentifierInfo &II, Scope *S) { 7334 // Before we produce a declaration for an implicitly defined 7335 // function, see whether there was a locally-scoped declaration of 7336 // this name as a function or variable. If so, use that 7337 // (non-visible) declaration, and complain about it. 7338 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7339 = findLocallyScopedExternalDecl(&II); 7340 if (Pos != LocallyScopedExternalDecls.end()) { 7341 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7342 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7343 return Pos->second; 7344 } 7345 7346 // Extension in C99. Legal in C90, but warn about it. 7347 unsigned diag_id; 7348 if (II.getName().startswith("__builtin_")) 7349 diag_id = diag::warn_builtin_unknown; 7350 else if (getLangOptions().C99) 7351 diag_id = diag::ext_implicit_function_decl; 7352 else 7353 diag_id = diag::warn_implicit_function_decl; 7354 Diag(Loc, diag_id) << &II; 7355 7356 // Because typo correction is expensive, only do it if the implicit 7357 // function declaration is going to be treated as an error. 7358 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7359 TypoCorrection Corrected; 7360 DeclFilterCCC<FunctionDecl> Validator; 7361 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7362 LookupOrdinaryName, S, 0, Validator))) { 7363 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7364 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7365 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7366 7367 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7368 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7369 7370 if (Func->getLocation().isValid() 7371 && !II.getName().startswith("__builtin_")) 7372 Diag(Func->getLocation(), diag::note_previous_decl) 7373 << CorrectedQuotedStr; 7374 } 7375 } 7376 7377 // Set a Declarator for the implicit definition: int foo(); 7378 const char *Dummy; 7379 AttributeFactory attrFactory; 7380 DeclSpec DS(attrFactory); 7381 unsigned DiagID; 7382 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7383 (void)Error; // Silence warning. 7384 assert(!Error && "Error setting up implicit decl!"); 7385 Declarator D(DS, Declarator::BlockContext); 7386 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7387 0, 0, true, SourceLocation(), 7388 SourceLocation(), SourceLocation(), 7389 SourceLocation(), 7390 EST_None, SourceLocation(), 7391 0, 0, 0, 0, Loc, Loc, D), 7392 DS.getAttributes(), 7393 SourceLocation()); 7394 D.SetIdentifier(&II, Loc); 7395 7396 // Insert this function into translation-unit scope. 7397 7398 DeclContext *PrevDC = CurContext; 7399 CurContext = Context.getTranslationUnitDecl(); 7400 7401 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7402 FD->setImplicit(); 7403 7404 CurContext = PrevDC; 7405 7406 AddKnownFunctionAttributes(FD); 7407 7408 return FD; 7409} 7410 7411/// \brief Adds any function attributes that we know a priori based on 7412/// the declaration of this function. 7413/// 7414/// These attributes can apply both to implicitly-declared builtins 7415/// (like __builtin___printf_chk) or to library-declared functions 7416/// like NSLog or printf. 7417/// 7418/// We need to check for duplicate attributes both here and where user-written 7419/// attributes are applied to declarations. 7420void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7421 if (FD->isInvalidDecl()) 7422 return; 7423 7424 // If this is a built-in function, map its builtin attributes to 7425 // actual attributes. 7426 if (unsigned BuiltinID = FD->getBuiltinID()) { 7427 // Handle printf-formatting attributes. 7428 unsigned FormatIdx; 7429 bool HasVAListArg; 7430 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7431 if (!FD->getAttr<FormatAttr>()) { 7432 const char *fmt = "printf"; 7433 unsigned int NumParams = FD->getNumParams(); 7434 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7435 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7436 fmt = "NSString"; 7437 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7438 fmt, FormatIdx+1, 7439 HasVAListArg ? 0 : FormatIdx+2)); 7440 } 7441 } 7442 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7443 HasVAListArg)) { 7444 if (!FD->getAttr<FormatAttr>()) 7445 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7446 "scanf", FormatIdx+1, 7447 HasVAListArg ? 0 : FormatIdx+2)); 7448 } 7449 7450 // Mark const if we don't care about errno and that is the only 7451 // thing preventing the function from being const. This allows 7452 // IRgen to use LLVM intrinsics for such functions. 7453 if (!getLangOptions().MathErrno && 7454 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7455 if (!FD->getAttr<ConstAttr>()) 7456 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7457 } 7458 7459 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7460 !FD->getAttr<ReturnsTwiceAttr>()) 7461 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7462 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7463 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7464 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7465 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7466 } 7467 7468 IdentifierInfo *Name = FD->getIdentifier(); 7469 if (!Name) 7470 return; 7471 if ((!getLangOptions().CPlusPlus && 7472 FD->getDeclContext()->isTranslationUnit()) || 7473 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7474 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7475 LinkageSpecDecl::lang_c)) { 7476 // Okay: this could be a libc/libm/Objective-C function we know 7477 // about. 7478 } else 7479 return; 7480 7481 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7482 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7483 // target-specific builtins, perhaps? 7484 if (!FD->getAttr<FormatAttr>()) 7485 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7486 "printf", 2, 7487 Name->isStr("vasprintf") ? 0 : 3)); 7488 } 7489} 7490 7491TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7492 TypeSourceInfo *TInfo) { 7493 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7494 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7495 7496 if (!TInfo) { 7497 assert(D.isInvalidType() && "no declarator info for valid type"); 7498 TInfo = Context.getTrivialTypeSourceInfo(T); 7499 } 7500 7501 // Scope manipulation handled by caller. 7502 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7503 D.getSourceRange().getBegin(), 7504 D.getIdentifierLoc(), 7505 D.getIdentifier(), 7506 TInfo); 7507 7508 // Bail out immediately if we have an invalid declaration. 7509 if (D.isInvalidType()) { 7510 NewTD->setInvalidDecl(); 7511 return NewTD; 7512 } 7513 7514 if (D.getDeclSpec().isModulePrivateSpecified()) { 7515 if (CurContext->isFunctionOrMethod()) 7516 Diag(NewTD->getLocation(), diag::err_module_private_local) 7517 << 2 << NewTD->getDeclName() 7518 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7519 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7520 else 7521 NewTD->setModulePrivate(); 7522 } 7523 7524 // C++ [dcl.typedef]p8: 7525 // If the typedef declaration defines an unnamed class (or 7526 // enum), the first typedef-name declared by the declaration 7527 // to be that class type (or enum type) is used to denote the 7528 // class type (or enum type) for linkage purposes only. 7529 // We need to check whether the type was declared in the declaration. 7530 switch (D.getDeclSpec().getTypeSpecType()) { 7531 case TST_enum: 7532 case TST_struct: 7533 case TST_union: 7534 case TST_class: { 7535 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7536 7537 // Do nothing if the tag is not anonymous or already has an 7538 // associated typedef (from an earlier typedef in this decl group). 7539 if (tagFromDeclSpec->getIdentifier()) break; 7540 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7541 7542 // A well-formed anonymous tag must always be a TUK_Definition. 7543 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7544 7545 // The type must match the tag exactly; no qualifiers allowed. 7546 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7547 break; 7548 7549 // Otherwise, set this is the anon-decl typedef for the tag. 7550 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7551 break; 7552 } 7553 7554 default: 7555 break; 7556 } 7557 7558 return NewTD; 7559} 7560 7561 7562/// \brief Determine whether a tag with a given kind is acceptable 7563/// as a redeclaration of the given tag declaration. 7564/// 7565/// \returns true if the new tag kind is acceptable, false otherwise. 7566bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7567 TagTypeKind NewTag, bool isDefinition, 7568 SourceLocation NewTagLoc, 7569 const IdentifierInfo &Name) { 7570 // C++ [dcl.type.elab]p3: 7571 // The class-key or enum keyword present in the 7572 // elaborated-type-specifier shall agree in kind with the 7573 // declaration to which the name in the elaborated-type-specifier 7574 // refers. This rule also applies to the form of 7575 // elaborated-type-specifier that declares a class-name or 7576 // friend class since it can be construed as referring to the 7577 // definition of the class. Thus, in any 7578 // elaborated-type-specifier, the enum keyword shall be used to 7579 // refer to an enumeration (7.2), the union class-key shall be 7580 // used to refer to a union (clause 9), and either the class or 7581 // struct class-key shall be used to refer to a class (clause 9) 7582 // declared using the class or struct class-key. 7583 TagTypeKind OldTag = Previous->getTagKind(); 7584 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7585 if (OldTag == NewTag) 7586 return true; 7587 7588 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7589 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7590 // Warn about the struct/class tag mismatch. 7591 bool isTemplate = false; 7592 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7593 isTemplate = Record->getDescribedClassTemplate(); 7594 7595 if (!ActiveTemplateInstantiations.empty()) { 7596 // In a template instantiation, do not offer fix-its for tag mismatches 7597 // since they usually mess up the template instead of fixing the problem. 7598 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7599 << (NewTag == TTK_Class) << isTemplate << &Name; 7600 return true; 7601 } 7602 7603 if (isDefinition) { 7604 // On definitions, check previous tags and issue a fix-it for each 7605 // one that doesn't match the current tag. 7606 if (Previous->getDefinition()) { 7607 // Don't suggest fix-its for redefinitions. 7608 return true; 7609 } 7610 7611 bool previousMismatch = false; 7612 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7613 E(Previous->redecls_end()); I != E; ++I) { 7614 if (I->getTagKind() != NewTag) { 7615 if (!previousMismatch) { 7616 previousMismatch = true; 7617 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7618 << (NewTag == TTK_Class) << isTemplate << &Name; 7619 } 7620 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7621 << (NewTag == TTK_Class) 7622 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7623 NewTag == TTK_Class? 7624 "class" : "struct"); 7625 } 7626 } 7627 return true; 7628 } 7629 7630 // Check for a previous definition. If current tag and definition 7631 // are same type, do nothing. If no definition, but disagree with 7632 // with previous tag type, give a warning, but no fix-it. 7633 const TagDecl *Redecl = Previous->getDefinition() ? 7634 Previous->getDefinition() : Previous; 7635 if (Redecl->getTagKind() == NewTag) { 7636 return true; 7637 } 7638 7639 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7640 << (NewTag == TTK_Class) 7641 << isTemplate << &Name; 7642 Diag(Redecl->getLocation(), diag::note_previous_use); 7643 7644 // If there is a previous defintion, suggest a fix-it. 7645 if (Previous->getDefinition()) { 7646 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7647 << (Redecl->getTagKind() == TTK_Class) 7648 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7649 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7650 } 7651 7652 return true; 7653 } 7654 return false; 7655} 7656 7657/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7658/// former case, Name will be non-null. In the later case, Name will be null. 7659/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7660/// reference/declaration/definition of a tag. 7661Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7662 SourceLocation KWLoc, CXXScopeSpec &SS, 7663 IdentifierInfo *Name, SourceLocation NameLoc, 7664 AttributeList *Attr, AccessSpecifier AS, 7665 SourceLocation ModulePrivateLoc, 7666 MultiTemplateParamsArg TemplateParameterLists, 7667 bool &OwnedDecl, bool &IsDependent, 7668 SourceLocation ScopedEnumKWLoc, 7669 bool ScopedEnumUsesClassTag, 7670 TypeResult UnderlyingType) { 7671 // If this is not a definition, it must have a name. 7672 assert((Name != 0 || TUK == TUK_Definition) && 7673 "Nameless record must be a definition!"); 7674 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7675 7676 OwnedDecl = false; 7677 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7678 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7679 7680 // FIXME: Check explicit specializations more carefully. 7681 bool isExplicitSpecialization = false; 7682 bool Invalid = false; 7683 7684 // We only need to do this matching if we have template parameters 7685 // or a scope specifier, which also conveniently avoids this work 7686 // for non-C++ cases. 7687 if (TemplateParameterLists.size() > 0 || 7688 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7689 if (TemplateParameterList *TemplateParams 7690 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7691 TemplateParameterLists.get(), 7692 TemplateParameterLists.size(), 7693 TUK == TUK_Friend, 7694 isExplicitSpecialization, 7695 Invalid)) { 7696 if (TemplateParams->size() > 0) { 7697 // This is a declaration or definition of a class template (which may 7698 // be a member of another template). 7699 7700 if (Invalid) 7701 return 0; 7702 7703 OwnedDecl = false; 7704 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7705 SS, Name, NameLoc, Attr, 7706 TemplateParams, AS, 7707 ModulePrivateLoc, 7708 TemplateParameterLists.size() - 1, 7709 (TemplateParameterList**) TemplateParameterLists.release()); 7710 return Result.get(); 7711 } else { 7712 // The "template<>" header is extraneous. 7713 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7714 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7715 isExplicitSpecialization = true; 7716 } 7717 } 7718 } 7719 7720 // Figure out the underlying type if this a enum declaration. We need to do 7721 // this early, because it's needed to detect if this is an incompatible 7722 // redeclaration. 7723 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7724 7725 if (Kind == TTK_Enum) { 7726 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7727 // No underlying type explicitly specified, or we failed to parse the 7728 // type, default to int. 7729 EnumUnderlying = Context.IntTy.getTypePtr(); 7730 else if (UnderlyingType.get()) { 7731 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7732 // integral type; any cv-qualification is ignored. 7733 TypeSourceInfo *TI = 0; 7734 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7735 EnumUnderlying = TI; 7736 7737 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7738 7739 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7740 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7741 << T; 7742 // Recover by falling back to int. 7743 EnumUnderlying = Context.IntTy.getTypePtr(); 7744 } 7745 7746 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7747 UPPC_FixedUnderlyingType)) 7748 EnumUnderlying = Context.IntTy.getTypePtr(); 7749 7750 } else if (getLangOptions().MicrosoftExt) 7751 // Microsoft enums are always of int type. 7752 EnumUnderlying = Context.IntTy.getTypePtr(); 7753 } 7754 7755 DeclContext *SearchDC = CurContext; 7756 DeclContext *DC = CurContext; 7757 bool isStdBadAlloc = false; 7758 7759 RedeclarationKind Redecl = ForRedeclaration; 7760 if (TUK == TUK_Friend || TUK == TUK_Reference) 7761 Redecl = NotForRedeclaration; 7762 7763 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7764 7765 if (Name && SS.isNotEmpty()) { 7766 // We have a nested-name tag ('struct foo::bar'). 7767 7768 // Check for invalid 'foo::'. 7769 if (SS.isInvalid()) { 7770 Name = 0; 7771 goto CreateNewDecl; 7772 } 7773 7774 // If this is a friend or a reference to a class in a dependent 7775 // context, don't try to make a decl for it. 7776 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7777 DC = computeDeclContext(SS, false); 7778 if (!DC) { 7779 IsDependent = true; 7780 return 0; 7781 } 7782 } else { 7783 DC = computeDeclContext(SS, true); 7784 if (!DC) { 7785 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7786 << SS.getRange(); 7787 return 0; 7788 } 7789 } 7790 7791 if (RequireCompleteDeclContext(SS, DC)) 7792 return 0; 7793 7794 SearchDC = DC; 7795 // Look-up name inside 'foo::'. 7796 LookupQualifiedName(Previous, DC); 7797 7798 if (Previous.isAmbiguous()) 7799 return 0; 7800 7801 if (Previous.empty()) { 7802 // Name lookup did not find anything. However, if the 7803 // nested-name-specifier refers to the current instantiation, 7804 // and that current instantiation has any dependent base 7805 // classes, we might find something at instantiation time: treat 7806 // this as a dependent elaborated-type-specifier. 7807 // But this only makes any sense for reference-like lookups. 7808 if (Previous.wasNotFoundInCurrentInstantiation() && 7809 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7810 IsDependent = true; 7811 return 0; 7812 } 7813 7814 // A tag 'foo::bar' must already exist. 7815 Diag(NameLoc, diag::err_not_tag_in_scope) 7816 << Kind << Name << DC << SS.getRange(); 7817 Name = 0; 7818 Invalid = true; 7819 goto CreateNewDecl; 7820 } 7821 } else if (Name) { 7822 // If this is a named struct, check to see if there was a previous forward 7823 // declaration or definition. 7824 // FIXME: We're looking into outer scopes here, even when we 7825 // shouldn't be. Doing so can result in ambiguities that we 7826 // shouldn't be diagnosing. 7827 LookupName(Previous, S); 7828 7829 if (Previous.isAmbiguous() && 7830 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7831 LookupResult::Filter F = Previous.makeFilter(); 7832 while (F.hasNext()) { 7833 NamedDecl *ND = F.next(); 7834 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7835 F.erase(); 7836 } 7837 F.done(); 7838 } 7839 7840 // Note: there used to be some attempt at recovery here. 7841 if (Previous.isAmbiguous()) 7842 return 0; 7843 7844 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7845 // FIXME: This makes sure that we ignore the contexts associated 7846 // with C structs, unions, and enums when looking for a matching 7847 // tag declaration or definition. See the similar lookup tweak 7848 // in Sema::LookupName; is there a better way to deal with this? 7849 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7850 SearchDC = SearchDC->getParent(); 7851 } 7852 } else if (S->isFunctionPrototypeScope()) { 7853 // If this is an enum declaration in function prototype scope, set its 7854 // initial context to the translation unit. 7855 SearchDC = Context.getTranslationUnitDecl(); 7856 } 7857 7858 if (Previous.isSingleResult() && 7859 Previous.getFoundDecl()->isTemplateParameter()) { 7860 // Maybe we will complain about the shadowed template parameter. 7861 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7862 // Just pretend that we didn't see the previous declaration. 7863 Previous.clear(); 7864 } 7865 7866 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7867 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7868 // This is a declaration of or a reference to "std::bad_alloc". 7869 isStdBadAlloc = true; 7870 7871 if (Previous.empty() && StdBadAlloc) { 7872 // std::bad_alloc has been implicitly declared (but made invisible to 7873 // name lookup). Fill in this implicit declaration as the previous 7874 // declaration, so that the declarations get chained appropriately. 7875 Previous.addDecl(getStdBadAlloc()); 7876 } 7877 } 7878 7879 // If we didn't find a previous declaration, and this is a reference 7880 // (or friend reference), move to the correct scope. In C++, we 7881 // also need to do a redeclaration lookup there, just in case 7882 // there's a shadow friend decl. 7883 if (Name && Previous.empty() && 7884 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7885 if (Invalid) goto CreateNewDecl; 7886 assert(SS.isEmpty()); 7887 7888 if (TUK == TUK_Reference) { 7889 // C++ [basic.scope.pdecl]p5: 7890 // -- for an elaborated-type-specifier of the form 7891 // 7892 // class-key identifier 7893 // 7894 // if the elaborated-type-specifier is used in the 7895 // decl-specifier-seq or parameter-declaration-clause of a 7896 // function defined in namespace scope, the identifier is 7897 // declared as a class-name in the namespace that contains 7898 // the declaration; otherwise, except as a friend 7899 // declaration, the identifier is declared in the smallest 7900 // non-class, non-function-prototype scope that contains the 7901 // declaration. 7902 // 7903 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7904 // C structs and unions. 7905 // 7906 // It is an error in C++ to declare (rather than define) an enum 7907 // type, including via an elaborated type specifier. We'll 7908 // diagnose that later; for now, declare the enum in the same 7909 // scope as we would have picked for any other tag type. 7910 // 7911 // GNU C also supports this behavior as part of its incomplete 7912 // enum types extension, while GNU C++ does not. 7913 // 7914 // Find the context where we'll be declaring the tag. 7915 // FIXME: We would like to maintain the current DeclContext as the 7916 // lexical context, 7917 while (SearchDC->isRecord() || SearchDC->isTransparentContext() || 7918 SearchDC->isObjCContainer()) 7919 SearchDC = SearchDC->getParent(); 7920 7921 // Find the scope where we'll be declaring the tag. 7922 while (S->isClassScope() || 7923 (getLangOptions().CPlusPlus && 7924 S->isFunctionPrototypeScope()) || 7925 ((S->getFlags() & Scope::DeclScope) == 0) || 7926 (S->getEntity() && 7927 ((DeclContext *)S->getEntity())->isTransparentContext())) 7928 S = S->getParent(); 7929 } else { 7930 assert(TUK == TUK_Friend); 7931 // C++ [namespace.memdef]p3: 7932 // If a friend declaration in a non-local class first declares a 7933 // class or function, the friend class or function is a member of 7934 // the innermost enclosing namespace. 7935 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7936 } 7937 7938 // In C++, we need to do a redeclaration lookup to properly 7939 // diagnose some problems. 7940 if (getLangOptions().CPlusPlus) { 7941 Previous.setRedeclarationKind(ForRedeclaration); 7942 LookupQualifiedName(Previous, SearchDC); 7943 } 7944 } 7945 7946 if (!Previous.empty()) { 7947 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7948 7949 // It's okay to have a tag decl in the same scope as a typedef 7950 // which hides a tag decl in the same scope. Finding this 7951 // insanity with a redeclaration lookup can only actually happen 7952 // in C++. 7953 // 7954 // This is also okay for elaborated-type-specifiers, which is 7955 // technically forbidden by the current standard but which is 7956 // okay according to the likely resolution of an open issue; 7957 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7958 if (getLangOptions().CPlusPlus) { 7959 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7960 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7961 TagDecl *Tag = TT->getDecl(); 7962 if (Tag->getDeclName() == Name && 7963 Tag->getDeclContext()->getRedeclContext() 7964 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7965 PrevDecl = Tag; 7966 Previous.clear(); 7967 Previous.addDecl(Tag); 7968 Previous.resolveKind(); 7969 } 7970 } 7971 } 7972 } 7973 7974 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7975 // If this is a use of a previous tag, or if the tag is already declared 7976 // in the same scope (so that the definition/declaration completes or 7977 // rementions the tag), reuse the decl. 7978 if (TUK == TUK_Reference || TUK == TUK_Friend || 7979 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7980 // Make sure that this wasn't declared as an enum and now used as a 7981 // struct or something similar. 7982 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7983 TUK == TUK_Definition, KWLoc, 7984 *Name)) { 7985 bool SafeToContinue 7986 = (PrevTagDecl->getTagKind() != TTK_Enum && 7987 Kind != TTK_Enum); 7988 if (SafeToContinue) 7989 Diag(KWLoc, diag::err_use_with_wrong_tag) 7990 << Name 7991 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7992 PrevTagDecl->getKindName()); 7993 else 7994 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7995 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7996 7997 if (SafeToContinue) 7998 Kind = PrevTagDecl->getTagKind(); 7999 else { 8000 // Recover by making this an anonymous redefinition. 8001 Name = 0; 8002 Previous.clear(); 8003 Invalid = true; 8004 } 8005 } 8006 8007 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8008 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8009 8010 // If this is an elaborated-type-specifier for a scoped enumeration, 8011 // the 'class' keyword is not necessary and not permitted. 8012 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8013 if (ScopedEnum) 8014 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8015 << PrevEnum->isScoped() 8016 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8017 return PrevTagDecl; 8018 } 8019 8020 // All conflicts with previous declarations are recovered by 8021 // returning the previous declaration. 8022 if (ScopedEnum != PrevEnum->isScoped()) { 8023 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 8024 << PrevEnum->isScoped(); 8025 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8026 return PrevTagDecl; 8027 } 8028 else if (EnumUnderlying && PrevEnum->isFixed()) { 8029 QualType T; 8030 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8031 T = TI->getType(); 8032 else 8033 T = QualType(EnumUnderlying.get<const Type*>(), 0); 8034 8035 if (!Context.hasSameUnqualifiedType(T, 8036 PrevEnum->getIntegerType())) { 8037 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 8038 diag::err_enum_redeclare_type_mismatch) 8039 << T 8040 << PrevEnum->getIntegerType(); 8041 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8042 return PrevTagDecl; 8043 } 8044 } 8045 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8046 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8047 << PrevEnum->isFixed(); 8048 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8049 return PrevTagDecl; 8050 } 8051 } 8052 8053 if (!Invalid) { 8054 // If this is a use, just return the declaration we found. 8055 8056 // FIXME: In the future, return a variant or some other clue 8057 // for the consumer of this Decl to know it doesn't own it. 8058 // For our current ASTs this shouldn't be a problem, but will 8059 // need to be changed with DeclGroups. 8060 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8061 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 8062 return PrevTagDecl; 8063 8064 // Diagnose attempts to redefine a tag. 8065 if (TUK == TUK_Definition) { 8066 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8067 // If we're defining a specialization and the previous definition 8068 // is from an implicit instantiation, don't emit an error 8069 // here; we'll catch this in the general case below. 8070 if (!isExplicitSpecialization || 8071 !isa<CXXRecordDecl>(Def) || 8072 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8073 == TSK_ExplicitSpecialization) { 8074 Diag(NameLoc, diag::err_redefinition) << Name; 8075 Diag(Def->getLocation(), diag::note_previous_definition); 8076 // If this is a redefinition, recover by making this 8077 // struct be anonymous, which will make any later 8078 // references get the previous definition. 8079 Name = 0; 8080 Previous.clear(); 8081 Invalid = true; 8082 } 8083 } else { 8084 // If the type is currently being defined, complain 8085 // about a nested redefinition. 8086 const TagType *Tag 8087 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8088 if (Tag->isBeingDefined()) { 8089 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8090 Diag(PrevTagDecl->getLocation(), 8091 diag::note_previous_definition); 8092 Name = 0; 8093 Previous.clear(); 8094 Invalid = true; 8095 } 8096 } 8097 8098 // Okay, this is definition of a previously declared or referenced 8099 // tag PrevDecl. We're going to create a new Decl for it. 8100 } 8101 } 8102 // If we get here we have (another) forward declaration or we 8103 // have a definition. Just create a new decl. 8104 8105 } else { 8106 // If we get here, this is a definition of a new tag type in a nested 8107 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8108 // new decl/type. We set PrevDecl to NULL so that the entities 8109 // have distinct types. 8110 Previous.clear(); 8111 } 8112 // If we get here, we're going to create a new Decl. If PrevDecl 8113 // is non-NULL, it's a definition of the tag declared by 8114 // PrevDecl. If it's NULL, we have a new definition. 8115 8116 8117 // Otherwise, PrevDecl is not a tag, but was found with tag 8118 // lookup. This is only actually possible in C++, where a few 8119 // things like templates still live in the tag namespace. 8120 } else { 8121 // Use a better diagnostic if an elaborated-type-specifier 8122 // found the wrong kind of type on the first 8123 // (non-redeclaration) lookup. 8124 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8125 !Previous.isForRedeclaration()) { 8126 unsigned Kind = 0; 8127 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8128 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8129 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8130 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8131 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8132 Invalid = true; 8133 8134 // Otherwise, only diagnose if the declaration is in scope. 8135 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8136 isExplicitSpecialization)) { 8137 // do nothing 8138 8139 // Diagnose implicit declarations introduced by elaborated types. 8140 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8141 unsigned Kind = 0; 8142 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8143 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8144 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8145 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8146 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8147 Invalid = true; 8148 8149 // Otherwise it's a declaration. Call out a particularly common 8150 // case here. 8151 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8152 unsigned Kind = 0; 8153 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8154 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8155 << Name << Kind << TND->getUnderlyingType(); 8156 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8157 Invalid = true; 8158 8159 // Otherwise, diagnose. 8160 } else { 8161 // The tag name clashes with something else in the target scope, 8162 // issue an error and recover by making this tag be anonymous. 8163 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8164 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8165 Name = 0; 8166 Invalid = true; 8167 } 8168 8169 // The existing declaration isn't relevant to us; we're in a 8170 // new scope, so clear out the previous declaration. 8171 Previous.clear(); 8172 } 8173 } 8174 8175CreateNewDecl: 8176 8177 TagDecl *PrevDecl = 0; 8178 if (Previous.isSingleResult()) 8179 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8180 8181 // If there is an identifier, use the location of the identifier as the 8182 // location of the decl, otherwise use the location of the struct/union 8183 // keyword. 8184 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8185 8186 // Otherwise, create a new declaration. If there is a previous 8187 // declaration of the same entity, the two will be linked via 8188 // PrevDecl. 8189 TagDecl *New; 8190 8191 bool IsForwardReference = false; 8192 if (Kind == TTK_Enum) { 8193 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8194 // enum X { A, B, C } D; D should chain to X. 8195 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8196 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8197 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8198 // If this is an undefined enum, warn. 8199 if (TUK != TUK_Definition && !Invalid) { 8200 TagDecl *Def; 8201 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8202 // C++0x: 7.2p2: opaque-enum-declaration. 8203 // Conflicts are diagnosed above. Do nothing. 8204 } 8205 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8206 Diag(Loc, diag::ext_forward_ref_enum_def) 8207 << New; 8208 Diag(Def->getLocation(), diag::note_previous_definition); 8209 } else { 8210 unsigned DiagID = diag::ext_forward_ref_enum; 8211 if (getLangOptions().MicrosoftExt) 8212 DiagID = diag::ext_ms_forward_ref_enum; 8213 else if (getLangOptions().CPlusPlus) 8214 DiagID = diag::err_forward_ref_enum; 8215 Diag(Loc, DiagID); 8216 8217 // If this is a forward-declared reference to an enumeration, make a 8218 // note of it; we won't actually be introducing the declaration into 8219 // the declaration context. 8220 if (TUK == TUK_Reference) 8221 IsForwardReference = true; 8222 } 8223 } 8224 8225 if (EnumUnderlying) { 8226 EnumDecl *ED = cast<EnumDecl>(New); 8227 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8228 ED->setIntegerTypeSourceInfo(TI); 8229 else 8230 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8231 ED->setPromotionType(ED->getIntegerType()); 8232 } 8233 8234 } else { 8235 // struct/union/class 8236 8237 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8238 // struct X { int A; } D; D should chain to X. 8239 if (getLangOptions().CPlusPlus) { 8240 // FIXME: Look for a way to use RecordDecl for simple structs. 8241 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8242 cast_or_null<CXXRecordDecl>(PrevDecl)); 8243 8244 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8245 StdBadAlloc = cast<CXXRecordDecl>(New); 8246 } else 8247 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8248 cast_or_null<RecordDecl>(PrevDecl)); 8249 } 8250 8251 // Maybe add qualifier info. 8252 if (SS.isNotEmpty()) { 8253 if (SS.isSet()) { 8254 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8255 if (TemplateParameterLists.size() > 0) { 8256 New->setTemplateParameterListsInfo(Context, 8257 TemplateParameterLists.size(), 8258 (TemplateParameterList**) TemplateParameterLists.release()); 8259 } 8260 } 8261 else 8262 Invalid = true; 8263 } 8264 8265 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8266 // Add alignment attributes if necessary; these attributes are checked when 8267 // the ASTContext lays out the structure. 8268 // 8269 // It is important for implementing the correct semantics that this 8270 // happen here (in act on tag decl). The #pragma pack stack is 8271 // maintained as a result of parser callbacks which can occur at 8272 // many points during the parsing of a struct declaration (because 8273 // the #pragma tokens are effectively skipped over during the 8274 // parsing of the struct). 8275 AddAlignmentAttributesForRecord(RD); 8276 8277 AddMsStructLayoutForRecord(RD); 8278 } 8279 8280 if (ModulePrivateLoc.isValid()) { 8281 if (isExplicitSpecialization) 8282 Diag(New->getLocation(), diag::err_module_private_specialization) 8283 << 2 8284 << FixItHint::CreateRemoval(ModulePrivateLoc); 8285 // __module_private__ does not apply to local classes. However, we only 8286 // diagnose this as an error when the declaration specifiers are 8287 // freestanding. Here, we just ignore the __module_private__. 8288 else if (!SearchDC->isFunctionOrMethod()) 8289 New->setModulePrivate(); 8290 } 8291 8292 // If this is a specialization of a member class (of a class template), 8293 // check the specialization. 8294 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8295 Invalid = true; 8296 8297 if (Invalid) 8298 New->setInvalidDecl(); 8299 8300 if (Attr) 8301 ProcessDeclAttributeList(S, New, Attr); 8302 8303 // If we're declaring or defining a tag in function prototype scope 8304 // in C, note that this type can only be used within the function. 8305 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8306 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8307 8308 // Set the lexical context. If the tag has a C++ scope specifier, the 8309 // lexical context will be different from the semantic context. 8310 New->setLexicalDeclContext(CurContext); 8311 8312 // Mark this as a friend decl if applicable. 8313 // In Microsoft mode, a friend declaration also acts as a forward 8314 // declaration so we always pass true to setObjectOfFriendDecl to make 8315 // the tag name visible. 8316 if (TUK == TUK_Friend) 8317 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8318 getLangOptions().MicrosoftExt); 8319 8320 // Set the access specifier. 8321 if (!Invalid && SearchDC->isRecord()) 8322 SetMemberAccessSpecifier(New, PrevDecl, AS); 8323 8324 if (TUK == TUK_Definition) 8325 New->startDefinition(); 8326 8327 // If this has an identifier, add it to the scope stack. 8328 if (TUK == TUK_Friend) { 8329 // We might be replacing an existing declaration in the lookup tables; 8330 // if so, borrow its access specifier. 8331 if (PrevDecl) 8332 New->setAccess(PrevDecl->getAccess()); 8333 8334 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8335 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8336 if (Name) // can be null along some error paths 8337 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8338 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8339 } else if (Name) { 8340 S = getNonFieldDeclScope(S); 8341 PushOnScopeChains(New, S, !IsForwardReference); 8342 if (IsForwardReference) 8343 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8344 8345 } else { 8346 CurContext->addDecl(New); 8347 } 8348 8349 // If this is the C FILE type, notify the AST context. 8350 if (IdentifierInfo *II = New->getIdentifier()) 8351 if (!New->isInvalidDecl() && 8352 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8353 II->isStr("FILE")) 8354 Context.setFILEDecl(New); 8355 8356 OwnedDecl = true; 8357 return New; 8358} 8359 8360void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8361 AdjustDeclIfTemplate(TagD); 8362 TagDecl *Tag = cast<TagDecl>(TagD); 8363 8364 // Enter the tag context. 8365 PushDeclContext(S, Tag); 8366} 8367 8368Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8369 assert(isa<ObjCContainerDecl>(IDecl) && 8370 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8371 DeclContext *OCD = cast<DeclContext>(IDecl); 8372 assert(getContainingDC(OCD) == CurContext && 8373 "The next DeclContext should be lexically contained in the current one."); 8374 CurContext = OCD; 8375 return IDecl; 8376} 8377 8378void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8379 SourceLocation FinalLoc, 8380 SourceLocation LBraceLoc) { 8381 AdjustDeclIfTemplate(TagD); 8382 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8383 8384 FieldCollector->StartClass(); 8385 8386 if (!Record->getIdentifier()) 8387 return; 8388 8389 if (FinalLoc.isValid()) 8390 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8391 8392 // C++ [class]p2: 8393 // [...] The class-name is also inserted into the scope of the 8394 // class itself; this is known as the injected-class-name. For 8395 // purposes of access checking, the injected-class-name is treated 8396 // as if it were a public member name. 8397 CXXRecordDecl *InjectedClassName 8398 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8399 Record->getLocStart(), Record->getLocation(), 8400 Record->getIdentifier(), 8401 /*PrevDecl=*/0, 8402 /*DelayTypeCreation=*/true); 8403 Context.getTypeDeclType(InjectedClassName, Record); 8404 InjectedClassName->setImplicit(); 8405 InjectedClassName->setAccess(AS_public); 8406 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8407 InjectedClassName->setDescribedClassTemplate(Template); 8408 PushOnScopeChains(InjectedClassName, S); 8409 assert(InjectedClassName->isInjectedClassName() && 8410 "Broken injected-class-name"); 8411} 8412 8413void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8414 SourceLocation RBraceLoc) { 8415 AdjustDeclIfTemplate(TagD); 8416 TagDecl *Tag = cast<TagDecl>(TagD); 8417 Tag->setRBraceLoc(RBraceLoc); 8418 8419 if (isa<CXXRecordDecl>(Tag)) 8420 FieldCollector->FinishClass(); 8421 8422 // Exit this scope of this tag's definition. 8423 PopDeclContext(); 8424 8425 // Notify the consumer that we've defined a tag. 8426 Consumer.HandleTagDeclDefinition(Tag); 8427} 8428 8429void Sema::ActOnObjCContainerFinishDefinition() { 8430 // Exit this scope of this interface definition. 8431 PopDeclContext(); 8432} 8433 8434void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8435 assert(DC == CurContext && "Mismatch of container contexts"); 8436 OriginalLexicalContext = DC; 8437 ActOnObjCContainerFinishDefinition(); 8438} 8439 8440void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8441 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8442 OriginalLexicalContext = 0; 8443} 8444 8445void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8446 AdjustDeclIfTemplate(TagD); 8447 TagDecl *Tag = cast<TagDecl>(TagD); 8448 Tag->setInvalidDecl(); 8449 8450 // We're undoing ActOnTagStartDefinition here, not 8451 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8452 // the FieldCollector. 8453 8454 PopDeclContext(); 8455} 8456 8457// Note that FieldName may be null for anonymous bitfields. 8458bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8459 QualType FieldTy, const Expr *BitWidth, 8460 bool *ZeroWidth) { 8461 // Default to true; that shouldn't confuse checks for emptiness 8462 if (ZeroWidth) 8463 *ZeroWidth = true; 8464 8465 // C99 6.7.2.1p4 - verify the field type. 8466 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8467 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8468 // Handle incomplete types with specific error. 8469 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8470 return true; 8471 if (FieldName) 8472 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8473 << FieldName << FieldTy << BitWidth->getSourceRange(); 8474 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8475 << FieldTy << BitWidth->getSourceRange(); 8476 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8477 UPPC_BitFieldWidth)) 8478 return true; 8479 8480 // If the bit-width is type- or value-dependent, don't try to check 8481 // it now. 8482 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8483 return false; 8484 8485 llvm::APSInt Value; 8486 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8487 return true; 8488 8489 if (Value != 0 && ZeroWidth) 8490 *ZeroWidth = false; 8491 8492 // Zero-width bitfield is ok for anonymous field. 8493 if (Value == 0 && FieldName) 8494 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8495 8496 if (Value.isSigned() && Value.isNegative()) { 8497 if (FieldName) 8498 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8499 << FieldName << Value.toString(10); 8500 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8501 << Value.toString(10); 8502 } 8503 8504 if (!FieldTy->isDependentType()) { 8505 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8506 if (Value.getZExtValue() > TypeSize) { 8507 if (!getLangOptions().CPlusPlus) { 8508 if (FieldName) 8509 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8510 << FieldName << (unsigned)Value.getZExtValue() 8511 << (unsigned)TypeSize; 8512 8513 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8514 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8515 } 8516 8517 if (FieldName) 8518 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8519 << FieldName << (unsigned)Value.getZExtValue() 8520 << (unsigned)TypeSize; 8521 else 8522 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8523 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8524 } 8525 } 8526 8527 return false; 8528} 8529 8530/// ActOnField - Each field of a C struct/union is passed into this in order 8531/// to create a FieldDecl object for it. 8532Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8533 Declarator &D, Expr *BitfieldWidth) { 8534 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8535 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8536 /*HasInit=*/false, AS_public); 8537 return Res; 8538} 8539 8540/// HandleField - Analyze a field of a C struct or a C++ data member. 8541/// 8542FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8543 SourceLocation DeclStart, 8544 Declarator &D, Expr *BitWidth, bool HasInit, 8545 AccessSpecifier AS) { 8546 IdentifierInfo *II = D.getIdentifier(); 8547 SourceLocation Loc = DeclStart; 8548 if (II) Loc = D.getIdentifierLoc(); 8549 8550 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8551 QualType T = TInfo->getType(); 8552 if (getLangOptions().CPlusPlus) { 8553 CheckExtraCXXDefaultArguments(D); 8554 8555 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8556 UPPC_DataMemberType)) { 8557 D.setInvalidType(); 8558 T = Context.IntTy; 8559 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8560 } 8561 } 8562 8563 DiagnoseFunctionSpecifiers(D); 8564 8565 if (D.getDeclSpec().isThreadSpecified()) 8566 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8567 if (D.getDeclSpec().isConstexprSpecified()) 8568 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8569 << 2; 8570 8571 // Check to see if this name was declared as a member previously 8572 NamedDecl *PrevDecl = 0; 8573 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8574 LookupName(Previous, S); 8575 switch (Previous.getResultKind()) { 8576 case LookupResult::Found: 8577 case LookupResult::FoundUnresolvedValue: 8578 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8579 break; 8580 8581 case LookupResult::FoundOverloaded: 8582 PrevDecl = Previous.getRepresentativeDecl(); 8583 break; 8584 8585 case LookupResult::NotFound: 8586 case LookupResult::NotFoundInCurrentInstantiation: 8587 case LookupResult::Ambiguous: 8588 break; 8589 } 8590 Previous.suppressDiagnostics(); 8591 8592 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8593 // Maybe we will complain about the shadowed template parameter. 8594 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8595 // Just pretend that we didn't see the previous declaration. 8596 PrevDecl = 0; 8597 } 8598 8599 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8600 PrevDecl = 0; 8601 8602 bool Mutable 8603 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8604 SourceLocation TSSL = D.getSourceRange().getBegin(); 8605 FieldDecl *NewFD 8606 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8607 TSSL, AS, PrevDecl, &D); 8608 8609 if (NewFD->isInvalidDecl()) 8610 Record->setInvalidDecl(); 8611 8612 if (D.getDeclSpec().isModulePrivateSpecified()) 8613 NewFD->setModulePrivate(); 8614 8615 if (NewFD->isInvalidDecl() && PrevDecl) { 8616 // Don't introduce NewFD into scope; there's already something 8617 // with the same name in the same scope. 8618 } else if (II) { 8619 PushOnScopeChains(NewFD, S); 8620 } else 8621 Record->addDecl(NewFD); 8622 8623 return NewFD; 8624} 8625 8626/// \brief Build a new FieldDecl and check its well-formedness. 8627/// 8628/// This routine builds a new FieldDecl given the fields name, type, 8629/// record, etc. \p PrevDecl should refer to any previous declaration 8630/// with the same name and in the same scope as the field to be 8631/// created. 8632/// 8633/// \returns a new FieldDecl. 8634/// 8635/// \todo The Declarator argument is a hack. It will be removed once 8636FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8637 TypeSourceInfo *TInfo, 8638 RecordDecl *Record, SourceLocation Loc, 8639 bool Mutable, Expr *BitWidth, bool HasInit, 8640 SourceLocation TSSL, 8641 AccessSpecifier AS, NamedDecl *PrevDecl, 8642 Declarator *D) { 8643 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8644 bool InvalidDecl = false; 8645 if (D) InvalidDecl = D->isInvalidType(); 8646 8647 // If we receive a broken type, recover by assuming 'int' and 8648 // marking this declaration as invalid. 8649 if (T.isNull()) { 8650 InvalidDecl = true; 8651 T = Context.IntTy; 8652 } 8653 8654 QualType EltTy = Context.getBaseElementType(T); 8655 if (!EltTy->isDependentType() && 8656 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8657 // Fields of incomplete type force their record to be invalid. 8658 Record->setInvalidDecl(); 8659 InvalidDecl = true; 8660 } 8661 8662 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8663 // than a variably modified type. 8664 if (!InvalidDecl && T->isVariablyModifiedType()) { 8665 bool SizeIsNegative; 8666 llvm::APSInt Oversized; 8667 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8668 SizeIsNegative, 8669 Oversized); 8670 if (!FixedTy.isNull()) { 8671 Diag(Loc, diag::warn_illegal_constant_array_size); 8672 T = FixedTy; 8673 } else { 8674 if (SizeIsNegative) 8675 Diag(Loc, diag::err_typecheck_negative_array_size); 8676 else if (Oversized.getBoolValue()) 8677 Diag(Loc, diag::err_array_too_large) 8678 << Oversized.toString(10); 8679 else 8680 Diag(Loc, diag::err_typecheck_field_variable_size); 8681 InvalidDecl = true; 8682 } 8683 } 8684 8685 // Fields can not have abstract class types 8686 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8687 diag::err_abstract_type_in_decl, 8688 AbstractFieldType)) 8689 InvalidDecl = true; 8690 8691 bool ZeroWidth = false; 8692 // If this is declared as a bit-field, check the bit-field. 8693 if (!InvalidDecl && BitWidth && 8694 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8695 InvalidDecl = true; 8696 BitWidth = 0; 8697 ZeroWidth = false; 8698 } 8699 8700 // Check that 'mutable' is consistent with the type of the declaration. 8701 if (!InvalidDecl && Mutable) { 8702 unsigned DiagID = 0; 8703 if (T->isReferenceType()) 8704 DiagID = diag::err_mutable_reference; 8705 else if (T.isConstQualified()) 8706 DiagID = diag::err_mutable_const; 8707 8708 if (DiagID) { 8709 SourceLocation ErrLoc = Loc; 8710 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8711 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8712 Diag(ErrLoc, DiagID); 8713 Mutable = false; 8714 InvalidDecl = true; 8715 } 8716 } 8717 8718 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8719 BitWidth, Mutable, HasInit); 8720 if (InvalidDecl) 8721 NewFD->setInvalidDecl(); 8722 8723 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8724 Diag(Loc, diag::err_duplicate_member) << II; 8725 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8726 NewFD->setInvalidDecl(); 8727 } 8728 8729 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8730 if (Record->isUnion()) { 8731 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8732 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8733 if (RDecl->getDefinition()) { 8734 // C++ [class.union]p1: An object of a class with a non-trivial 8735 // constructor, a non-trivial copy constructor, a non-trivial 8736 // destructor, or a non-trivial copy assignment operator 8737 // cannot be a member of a union, nor can an array of such 8738 // objects. 8739 if (CheckNontrivialField(NewFD)) 8740 NewFD->setInvalidDecl(); 8741 } 8742 } 8743 8744 // C++ [class.union]p1: If a union contains a member of reference type, 8745 // the program is ill-formed. 8746 if (EltTy->isReferenceType()) { 8747 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8748 << NewFD->getDeclName() << EltTy; 8749 NewFD->setInvalidDecl(); 8750 } 8751 } 8752 } 8753 8754 // FIXME: We need to pass in the attributes given an AST 8755 // representation, not a parser representation. 8756 if (D) 8757 // FIXME: What to pass instead of TUScope? 8758 ProcessDeclAttributes(TUScope, NewFD, *D); 8759 8760 // In auto-retain/release, infer strong retension for fields of 8761 // retainable type. 8762 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8763 NewFD->setInvalidDecl(); 8764 8765 if (T.isObjCGCWeak()) 8766 Diag(Loc, diag::warn_attribute_weak_on_field); 8767 8768 NewFD->setAccess(AS); 8769 return NewFD; 8770} 8771 8772bool Sema::CheckNontrivialField(FieldDecl *FD) { 8773 assert(FD); 8774 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8775 8776 if (FD->isInvalidDecl()) 8777 return true; 8778 8779 QualType EltTy = Context.getBaseElementType(FD->getType()); 8780 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8781 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8782 if (RDecl->getDefinition()) { 8783 // We check for copy constructors before constructors 8784 // because otherwise we'll never get complaints about 8785 // copy constructors. 8786 8787 CXXSpecialMember member = CXXInvalid; 8788 if (!RDecl->hasTrivialCopyConstructor()) 8789 member = CXXCopyConstructor; 8790 else if (!RDecl->hasTrivialDefaultConstructor()) 8791 member = CXXDefaultConstructor; 8792 else if (!RDecl->hasTrivialCopyAssignment()) 8793 member = CXXCopyAssignment; 8794 else if (!RDecl->hasTrivialDestructor()) 8795 member = CXXDestructor; 8796 8797 if (member != CXXInvalid) { 8798 if (!getLangOptions().CPlusPlus0x && 8799 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8800 // Objective-C++ ARC: it is an error to have a non-trivial field of 8801 // a union. However, system headers in Objective-C programs 8802 // occasionally have Objective-C lifetime objects within unions, 8803 // and rather than cause the program to fail, we make those 8804 // members unavailable. 8805 SourceLocation Loc = FD->getLocation(); 8806 if (getSourceManager().isInSystemHeader(Loc)) { 8807 if (!FD->hasAttr<UnavailableAttr>()) 8808 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8809 "this system field has retaining ownership")); 8810 return false; 8811 } 8812 } 8813 8814 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8815 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8816 diag::err_illegal_union_or_anon_struct_member) 8817 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8818 DiagnoseNontrivial(RT, member); 8819 return !getLangOptions().CPlusPlus0x; 8820 } 8821 } 8822 } 8823 8824 return false; 8825} 8826 8827/// DiagnoseNontrivial - Given that a class has a non-trivial 8828/// special member, figure out why. 8829void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8830 QualType QT(T, 0U); 8831 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8832 8833 // Check whether the member was user-declared. 8834 switch (member) { 8835 case CXXInvalid: 8836 break; 8837 8838 case CXXDefaultConstructor: 8839 if (RD->hasUserDeclaredConstructor()) { 8840 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8841 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8842 const FunctionDecl *body = 0; 8843 ci->hasBody(body); 8844 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8845 SourceLocation CtorLoc = ci->getLocation(); 8846 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8847 return; 8848 } 8849 } 8850 8851 llvm_unreachable("found no user-declared constructors"); 8852 } 8853 break; 8854 8855 case CXXCopyConstructor: 8856 if (RD->hasUserDeclaredCopyConstructor()) { 8857 SourceLocation CtorLoc = 8858 RD->getCopyConstructor(0)->getLocation(); 8859 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8860 return; 8861 } 8862 break; 8863 8864 case CXXMoveConstructor: 8865 if (RD->hasUserDeclaredMoveConstructor()) { 8866 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8867 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8868 return; 8869 } 8870 break; 8871 8872 case CXXCopyAssignment: 8873 if (RD->hasUserDeclaredCopyAssignment()) { 8874 // FIXME: this should use the location of the copy 8875 // assignment, not the type. 8876 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8877 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8878 return; 8879 } 8880 break; 8881 8882 case CXXMoveAssignment: 8883 if (RD->hasUserDeclaredMoveAssignment()) { 8884 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8885 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8886 return; 8887 } 8888 break; 8889 8890 case CXXDestructor: 8891 if (RD->hasUserDeclaredDestructor()) { 8892 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8893 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8894 return; 8895 } 8896 break; 8897 } 8898 8899 typedef CXXRecordDecl::base_class_iterator base_iter; 8900 8901 // Virtual bases and members inhibit trivial copying/construction, 8902 // but not trivial destruction. 8903 if (member != CXXDestructor) { 8904 // Check for virtual bases. vbases includes indirect virtual bases, 8905 // so we just iterate through the direct bases. 8906 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8907 if (bi->isVirtual()) { 8908 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8909 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8910 return; 8911 } 8912 8913 // Check for virtual methods. 8914 typedef CXXRecordDecl::method_iterator meth_iter; 8915 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8916 ++mi) { 8917 if (mi->isVirtual()) { 8918 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8919 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8920 return; 8921 } 8922 } 8923 } 8924 8925 bool (CXXRecordDecl::*hasTrivial)() const; 8926 switch (member) { 8927 case CXXDefaultConstructor: 8928 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8929 case CXXCopyConstructor: 8930 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8931 case CXXCopyAssignment: 8932 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8933 case CXXDestructor: 8934 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8935 default: 8936 llvm_unreachable("unexpected special member"); 8937 } 8938 8939 // Check for nontrivial bases (and recurse). 8940 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8941 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8942 assert(BaseRT && "Don't know how to handle dependent bases"); 8943 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8944 if (!(BaseRecTy->*hasTrivial)()) { 8945 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8946 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8947 DiagnoseNontrivial(BaseRT, member); 8948 return; 8949 } 8950 } 8951 8952 // Check for nontrivial members (and recurse). 8953 typedef RecordDecl::field_iterator field_iter; 8954 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8955 ++fi) { 8956 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8957 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8958 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8959 8960 if (!(EltRD->*hasTrivial)()) { 8961 SourceLocation FLoc = (*fi)->getLocation(); 8962 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8963 DiagnoseNontrivial(EltRT, member); 8964 return; 8965 } 8966 } 8967 8968 if (EltTy->isObjCLifetimeType()) { 8969 switch (EltTy.getObjCLifetime()) { 8970 case Qualifiers::OCL_None: 8971 case Qualifiers::OCL_ExplicitNone: 8972 break; 8973 8974 case Qualifiers::OCL_Autoreleasing: 8975 case Qualifiers::OCL_Weak: 8976 case Qualifiers::OCL_Strong: 8977 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8978 << QT << EltTy.getObjCLifetime(); 8979 return; 8980 } 8981 } 8982 } 8983 8984 llvm_unreachable("found no explanation for non-trivial member"); 8985} 8986 8987/// TranslateIvarVisibility - Translate visibility from a token ID to an 8988/// AST enum value. 8989static ObjCIvarDecl::AccessControl 8990TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8991 switch (ivarVisibility) { 8992 default: llvm_unreachable("Unknown visitibility kind"); 8993 case tok::objc_private: return ObjCIvarDecl::Private; 8994 case tok::objc_public: return ObjCIvarDecl::Public; 8995 case tok::objc_protected: return ObjCIvarDecl::Protected; 8996 case tok::objc_package: return ObjCIvarDecl::Package; 8997 } 8998} 8999 9000/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9001/// in order to create an IvarDecl object for it. 9002Decl *Sema::ActOnIvar(Scope *S, 9003 SourceLocation DeclStart, 9004 Declarator &D, Expr *BitfieldWidth, 9005 tok::ObjCKeywordKind Visibility) { 9006 9007 IdentifierInfo *II = D.getIdentifier(); 9008 Expr *BitWidth = (Expr*)BitfieldWidth; 9009 SourceLocation Loc = DeclStart; 9010 if (II) Loc = D.getIdentifierLoc(); 9011 9012 // FIXME: Unnamed fields can be handled in various different ways, for 9013 // example, unnamed unions inject all members into the struct namespace! 9014 9015 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9016 QualType T = TInfo->getType(); 9017 9018 if (BitWidth) { 9019 // 6.7.2.1p3, 6.7.2.1p4 9020 if (VerifyBitField(Loc, II, T, BitWidth)) { 9021 D.setInvalidType(); 9022 BitWidth = 0; 9023 } 9024 } else { 9025 // Not a bitfield. 9026 9027 // validate II. 9028 9029 } 9030 if (T->isReferenceType()) { 9031 Diag(Loc, diag::err_ivar_reference_type); 9032 D.setInvalidType(); 9033 } 9034 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9035 // than a variably modified type. 9036 else if (T->isVariablyModifiedType()) { 9037 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9038 D.setInvalidType(); 9039 } 9040 9041 // Get the visibility (access control) for this ivar. 9042 ObjCIvarDecl::AccessControl ac = 9043 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9044 : ObjCIvarDecl::None; 9045 // Must set ivar's DeclContext to its enclosing interface. 9046 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9047 ObjCContainerDecl *EnclosingContext; 9048 if (ObjCImplementationDecl *IMPDecl = 9049 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9050 if (!LangOpts.ObjCNonFragileABI2) { 9051 // Case of ivar declared in an implementation. Context is that of its class. 9052 EnclosingContext = IMPDecl->getClassInterface(); 9053 assert(EnclosingContext && "Implementation has no class interface!"); 9054 } 9055 else 9056 EnclosingContext = EnclosingDecl; 9057 } else { 9058 if (ObjCCategoryDecl *CDecl = 9059 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9060 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9061 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9062 return 0; 9063 } 9064 } 9065 EnclosingContext = EnclosingDecl; 9066 } 9067 9068 // Construct the decl. 9069 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9070 DeclStart, Loc, II, T, 9071 TInfo, ac, (Expr *)BitfieldWidth); 9072 9073 if (II) { 9074 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9075 ForRedeclaration); 9076 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9077 && !isa<TagDecl>(PrevDecl)) { 9078 Diag(Loc, diag::err_duplicate_member) << II; 9079 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9080 NewID->setInvalidDecl(); 9081 } 9082 } 9083 9084 // Process attributes attached to the ivar. 9085 ProcessDeclAttributes(S, NewID, D); 9086 9087 if (D.isInvalidType()) 9088 NewID->setInvalidDecl(); 9089 9090 // In ARC, infer 'retaining' for ivars of retainable type. 9091 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9092 NewID->setInvalidDecl(); 9093 9094 if (D.getDeclSpec().isModulePrivateSpecified()) 9095 NewID->setModulePrivate(); 9096 9097 if (II) { 9098 // FIXME: When interfaces are DeclContexts, we'll need to add 9099 // these to the interface. 9100 S->AddDecl(NewID); 9101 IdResolver.AddDecl(NewID); 9102 } 9103 9104 return NewID; 9105} 9106 9107/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9108/// class and class extensions. For every class @interface and class 9109/// extension @interface, if the last ivar is a bitfield of any type, 9110/// then add an implicit `char :0` ivar to the end of that interface. 9111void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9112 SmallVectorImpl<Decl *> &AllIvarDecls) { 9113 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9114 return; 9115 9116 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9117 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9118 9119 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9120 return; 9121 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9122 if (!ID) { 9123 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9124 if (!CD->IsClassExtension()) 9125 return; 9126 } 9127 // No need to add this to end of @implementation. 9128 else 9129 return; 9130 } 9131 // All conditions are met. Add a new bitfield to the tail end of ivars. 9132 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9133 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9134 9135 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9136 DeclLoc, DeclLoc, 0, 9137 Context.CharTy, 9138 Context.getTrivialTypeSourceInfo(Context.CharTy, 9139 DeclLoc), 9140 ObjCIvarDecl::Private, BW, 9141 true); 9142 AllIvarDecls.push_back(Ivar); 9143} 9144 9145void Sema::ActOnFields(Scope* S, 9146 SourceLocation RecLoc, Decl *EnclosingDecl, 9147 llvm::ArrayRef<Decl *> Fields, 9148 SourceLocation LBrac, SourceLocation RBrac, 9149 AttributeList *Attr) { 9150 assert(EnclosingDecl && "missing record or interface decl"); 9151 9152 // If the decl this is being inserted into is invalid, then it may be a 9153 // redeclaration or some other bogus case. Don't try to add fields to it. 9154 if (EnclosingDecl->isInvalidDecl()) 9155 return; 9156 9157 // Verify that all the fields are okay. 9158 unsigned NumNamedMembers = 0; 9159 SmallVector<FieldDecl*, 32> RecFields; 9160 9161 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9162 bool ARCErrReported = false; 9163 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9164 i != end; ++i) { 9165 FieldDecl *FD = cast<FieldDecl>(*i); 9166 9167 // Get the type for the field. 9168 const Type *FDTy = FD->getType().getTypePtr(); 9169 9170 if (!FD->isAnonymousStructOrUnion()) { 9171 // Remember all fields written by the user. 9172 RecFields.push_back(FD); 9173 } 9174 9175 // If the field is already invalid for some reason, don't emit more 9176 // diagnostics about it. 9177 if (FD->isInvalidDecl()) { 9178 EnclosingDecl->setInvalidDecl(); 9179 continue; 9180 } 9181 9182 // C99 6.7.2.1p2: 9183 // A structure or union shall not contain a member with 9184 // incomplete or function type (hence, a structure shall not 9185 // contain an instance of itself, but may contain a pointer to 9186 // an instance of itself), except that the last member of a 9187 // structure with more than one named member may have incomplete 9188 // array type; such a structure (and any union containing, 9189 // possibly recursively, a member that is such a structure) 9190 // shall not be a member of a structure or an element of an 9191 // array. 9192 if (FDTy->isFunctionType()) { 9193 // Field declared as a function. 9194 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9195 << FD->getDeclName(); 9196 FD->setInvalidDecl(); 9197 EnclosingDecl->setInvalidDecl(); 9198 continue; 9199 } else if (FDTy->isIncompleteArrayType() && Record && 9200 ((i + 1 == Fields.end() && !Record->isUnion()) || 9201 ((getLangOptions().MicrosoftExt || 9202 getLangOptions().CPlusPlus) && 9203 (i + 1 == Fields.end() || Record->isUnion())))) { 9204 // Flexible array member. 9205 // Microsoft and g++ is more permissive regarding flexible array. 9206 // It will accept flexible array in union and also 9207 // as the sole element of a struct/class. 9208 if (getLangOptions().MicrosoftExt) { 9209 if (Record->isUnion()) 9210 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9211 << FD->getDeclName(); 9212 else if (Fields.size() == 1) 9213 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9214 << FD->getDeclName() << Record->getTagKind(); 9215 } else if (getLangOptions().CPlusPlus) { 9216 if (Record->isUnion()) 9217 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9218 << FD->getDeclName(); 9219 else if (Fields.size() == 1) 9220 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9221 << FD->getDeclName() << Record->getTagKind(); 9222 } else if (NumNamedMembers < 1) { 9223 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9224 << FD->getDeclName(); 9225 FD->setInvalidDecl(); 9226 EnclosingDecl->setInvalidDecl(); 9227 continue; 9228 } 9229 if (!FD->getType()->isDependentType() && 9230 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9231 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9232 << FD->getDeclName() << FD->getType(); 9233 FD->setInvalidDecl(); 9234 EnclosingDecl->setInvalidDecl(); 9235 continue; 9236 } 9237 // Okay, we have a legal flexible array member at the end of the struct. 9238 if (Record) 9239 Record->setHasFlexibleArrayMember(true); 9240 } else if (!FDTy->isDependentType() && 9241 RequireCompleteType(FD->getLocation(), FD->getType(), 9242 diag::err_field_incomplete)) { 9243 // Incomplete type 9244 FD->setInvalidDecl(); 9245 EnclosingDecl->setInvalidDecl(); 9246 continue; 9247 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9248 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9249 // If this is a member of a union, then entire union becomes "flexible". 9250 if (Record && Record->isUnion()) { 9251 Record->setHasFlexibleArrayMember(true); 9252 } else { 9253 // If this is a struct/class and this is not the last element, reject 9254 // it. Note that GCC supports variable sized arrays in the middle of 9255 // structures. 9256 if (i + 1 != Fields.end()) 9257 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9258 << FD->getDeclName() << FD->getType(); 9259 else { 9260 // We support flexible arrays at the end of structs in 9261 // other structs as an extension. 9262 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9263 << FD->getDeclName(); 9264 if (Record) 9265 Record->setHasFlexibleArrayMember(true); 9266 } 9267 } 9268 } 9269 if (Record && FDTTy->getDecl()->hasObjectMember()) 9270 Record->setHasObjectMember(true); 9271 } else if (FDTy->isObjCObjectType()) { 9272 /// A field cannot be an Objective-c object 9273 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9274 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9275 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9276 FD->setType(T); 9277 } 9278 else if (!getLangOptions().CPlusPlus) { 9279 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9280 // It's an error in ARC if a field has lifetime. 9281 // We don't want to report this in a system header, though, 9282 // so we just make the field unavailable. 9283 // FIXME: that's really not sufficient; we need to make the type 9284 // itself invalid to, say, initialize or copy. 9285 QualType T = FD->getType(); 9286 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9287 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9288 SourceLocation loc = FD->getLocation(); 9289 if (getSourceManager().isInSystemHeader(loc)) { 9290 if (!FD->hasAttr<UnavailableAttr>()) { 9291 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9292 "this system field has retaining ownership")); 9293 } 9294 } else { 9295 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9296 << T->isBlockPointerType(); 9297 } 9298 ARCErrReported = true; 9299 } 9300 } 9301 else if (getLangOptions().ObjC1 && 9302 getLangOptions().getGC() != LangOptions::NonGC && 9303 Record && !Record->hasObjectMember()) { 9304 if (FD->getType()->isObjCObjectPointerType() || 9305 FD->getType().isObjCGCStrong()) 9306 Record->setHasObjectMember(true); 9307 else if (Context.getAsArrayType(FD->getType())) { 9308 QualType BaseType = Context.getBaseElementType(FD->getType()); 9309 if (BaseType->isRecordType() && 9310 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9311 Record->setHasObjectMember(true); 9312 else if (BaseType->isObjCObjectPointerType() || 9313 BaseType.isObjCGCStrong()) 9314 Record->setHasObjectMember(true); 9315 } 9316 } 9317 } 9318 // Keep track of the number of named members. 9319 if (FD->getIdentifier()) 9320 ++NumNamedMembers; 9321 } 9322 9323 // Okay, we successfully defined 'Record'. 9324 if (Record) { 9325 bool Completed = false; 9326 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9327 if (!CXXRecord->isInvalidDecl()) { 9328 // Set access bits correctly on the directly-declared conversions. 9329 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9330 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9331 I != E; ++I) 9332 Convs->setAccess(I, (*I)->getAccess()); 9333 9334 if (!CXXRecord->isDependentType()) { 9335 // Objective-C Automatic Reference Counting: 9336 // If a class has a non-static data member of Objective-C pointer 9337 // type (or array thereof), it is a non-POD type and its 9338 // default constructor (if any), copy constructor, copy assignment 9339 // operator, and destructor are non-trivial. 9340 // 9341 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9342 // However, here we check whether this particular class is only 9343 // non-POD because of the presence of an Objective-C pointer member. 9344 // If so, objects of this type cannot be shared between code compiled 9345 // with instant objects and code compiled with manual retain/release. 9346 if (getLangOptions().ObjCAutoRefCount && 9347 CXXRecord->hasObjectMember() && 9348 CXXRecord->getLinkage() == ExternalLinkage) { 9349 if (CXXRecord->isPOD()) { 9350 Diag(CXXRecord->getLocation(), 9351 diag::warn_arc_non_pod_class_with_object_member) 9352 << CXXRecord; 9353 } else { 9354 // FIXME: Fix-Its would be nice here, but finding a good location 9355 // for them is going to be tricky. 9356 if (CXXRecord->hasTrivialCopyConstructor()) 9357 Diag(CXXRecord->getLocation(), 9358 diag::warn_arc_trivial_member_function_with_object_member) 9359 << CXXRecord << 0; 9360 if (CXXRecord->hasTrivialCopyAssignment()) 9361 Diag(CXXRecord->getLocation(), 9362 diag::warn_arc_trivial_member_function_with_object_member) 9363 << CXXRecord << 1; 9364 if (CXXRecord->hasTrivialDestructor()) 9365 Diag(CXXRecord->getLocation(), 9366 diag::warn_arc_trivial_member_function_with_object_member) 9367 << CXXRecord << 2; 9368 } 9369 } 9370 9371 // Adjust user-defined destructor exception spec. 9372 if (getLangOptions().CPlusPlus0x && 9373 CXXRecord->hasUserDeclaredDestructor()) 9374 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9375 9376 // Add any implicitly-declared members to this class. 9377 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9378 9379 // If we have virtual base classes, we may end up finding multiple 9380 // final overriders for a given virtual function. Check for this 9381 // problem now. 9382 if (CXXRecord->getNumVBases()) { 9383 CXXFinalOverriderMap FinalOverriders; 9384 CXXRecord->getFinalOverriders(FinalOverriders); 9385 9386 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9387 MEnd = FinalOverriders.end(); 9388 M != MEnd; ++M) { 9389 for (OverridingMethods::iterator SO = M->second.begin(), 9390 SOEnd = M->second.end(); 9391 SO != SOEnd; ++SO) { 9392 assert(SO->second.size() > 0 && 9393 "Virtual function without overridding functions?"); 9394 if (SO->second.size() == 1) 9395 continue; 9396 9397 // C++ [class.virtual]p2: 9398 // In a derived class, if a virtual member function of a base 9399 // class subobject has more than one final overrider the 9400 // program is ill-formed. 9401 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9402 << (NamedDecl *)M->first << Record; 9403 Diag(M->first->getLocation(), 9404 diag::note_overridden_virtual_function); 9405 for (OverridingMethods::overriding_iterator 9406 OM = SO->second.begin(), 9407 OMEnd = SO->second.end(); 9408 OM != OMEnd; ++OM) 9409 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9410 << (NamedDecl *)M->first << OM->Method->getParent(); 9411 9412 Record->setInvalidDecl(); 9413 } 9414 } 9415 CXXRecord->completeDefinition(&FinalOverriders); 9416 Completed = true; 9417 } 9418 } 9419 } 9420 } 9421 9422 if (!Completed) 9423 Record->completeDefinition(); 9424 9425 // Now that the record is complete, do any delayed exception spec checks 9426 // we were missing. 9427 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9428 const CXXDestructorDecl *Dtor = 9429 DelayedDestructorExceptionSpecChecks.back().first; 9430 if (Dtor->getParent() != Record) 9431 break; 9432 9433 assert(!Dtor->getParent()->isDependentType() && 9434 "Should not ever add destructors of templates into the list."); 9435 CheckOverridingFunctionExceptionSpec(Dtor, 9436 DelayedDestructorExceptionSpecChecks.back().second); 9437 DelayedDestructorExceptionSpecChecks.pop_back(); 9438 } 9439 9440 } else { 9441 ObjCIvarDecl **ClsFields = 9442 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9443 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9444 ID->setEndOfDefinitionLoc(RBrac); 9445 // Add ivar's to class's DeclContext. 9446 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9447 ClsFields[i]->setLexicalDeclContext(ID); 9448 ID->addDecl(ClsFields[i]); 9449 } 9450 // Must enforce the rule that ivars in the base classes may not be 9451 // duplicates. 9452 if (ID->getSuperClass()) 9453 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9454 } else if (ObjCImplementationDecl *IMPDecl = 9455 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9456 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9457 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9458 // Ivar declared in @implementation never belongs to the implementation. 9459 // Only it is in implementation's lexical context. 9460 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9461 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9462 } else if (ObjCCategoryDecl *CDecl = 9463 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9464 // case of ivars in class extension; all other cases have been 9465 // reported as errors elsewhere. 9466 // FIXME. Class extension does not have a LocEnd field. 9467 // CDecl->setLocEnd(RBrac); 9468 // Add ivar's to class extension's DeclContext. 9469 // Diagnose redeclaration of private ivars. 9470 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9471 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9472 if (IDecl) { 9473 if (const ObjCIvarDecl *ClsIvar = 9474 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9475 Diag(ClsFields[i]->getLocation(), 9476 diag::err_duplicate_ivar_declaration); 9477 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9478 continue; 9479 } 9480 for (const ObjCCategoryDecl *ClsExtDecl = 9481 IDecl->getFirstClassExtension(); 9482 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9483 if (const ObjCIvarDecl *ClsExtIvar = 9484 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9485 Diag(ClsFields[i]->getLocation(), 9486 diag::err_duplicate_ivar_declaration); 9487 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9488 continue; 9489 } 9490 } 9491 } 9492 ClsFields[i]->setLexicalDeclContext(CDecl); 9493 CDecl->addDecl(ClsFields[i]); 9494 } 9495 } 9496 } 9497 9498 if (Attr) 9499 ProcessDeclAttributeList(S, Record, Attr); 9500 9501 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9502 // set the visibility of this record. 9503 if (Record && !Record->getDeclContext()->isRecord()) 9504 AddPushedVisibilityAttribute(Record); 9505} 9506 9507/// \brief Determine whether the given integral value is representable within 9508/// the given type T. 9509static bool isRepresentableIntegerValue(ASTContext &Context, 9510 llvm::APSInt &Value, 9511 QualType T) { 9512 assert(T->isIntegralType(Context) && "Integral type required!"); 9513 unsigned BitWidth = Context.getIntWidth(T); 9514 9515 if (Value.isUnsigned() || Value.isNonNegative()) { 9516 if (T->isSignedIntegerOrEnumerationType()) 9517 --BitWidth; 9518 return Value.getActiveBits() <= BitWidth; 9519 } 9520 return Value.getMinSignedBits() <= BitWidth; 9521} 9522 9523// \brief Given an integral type, return the next larger integral type 9524// (or a NULL type of no such type exists). 9525static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9526 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9527 // enum checking below. 9528 assert(T->isIntegralType(Context) && "Integral type required!"); 9529 const unsigned NumTypes = 4; 9530 QualType SignedIntegralTypes[NumTypes] = { 9531 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9532 }; 9533 QualType UnsignedIntegralTypes[NumTypes] = { 9534 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9535 Context.UnsignedLongLongTy 9536 }; 9537 9538 unsigned BitWidth = Context.getTypeSize(T); 9539 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9540 : UnsignedIntegralTypes; 9541 for (unsigned I = 0; I != NumTypes; ++I) 9542 if (Context.getTypeSize(Types[I]) > BitWidth) 9543 return Types[I]; 9544 9545 return QualType(); 9546} 9547 9548EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9549 EnumConstantDecl *LastEnumConst, 9550 SourceLocation IdLoc, 9551 IdentifierInfo *Id, 9552 Expr *Val) { 9553 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9554 llvm::APSInt EnumVal(IntWidth); 9555 QualType EltTy; 9556 9557 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9558 Val = 0; 9559 9560 if (Val) 9561 Val = DefaultLvalueConversion(Val).take(); 9562 9563 if (Val) { 9564 if (Enum->isDependentType() || Val->isTypeDependent()) 9565 EltTy = Context.DependentTy; 9566 else { 9567 SourceLocation ExpLoc; 9568 if (getLangOptions().CPlusPlus0x && Enum->isFixed() && 9569 !getLangOptions().MicrosoftMode) { 9570 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 9571 // constant-expression in the enumerator-definition shall be a converted 9572 // constant expression of the underlying type. 9573 EltTy = Enum->getIntegerType(); 9574 ExprResult Converted = 9575 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 9576 CCEK_Enumerator); 9577 if (Converted.isInvalid()) 9578 Val = 0; 9579 else 9580 Val = Converted.take(); 9581 } else if (!Val->isValueDependent() && 9582 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9583 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9584 Val = 0; 9585 } else { 9586 if (!getLangOptions().CPlusPlus) { 9587 // C99 6.7.2.2p2: 9588 // The expression that defines the value of an enumeration constant 9589 // shall be an integer constant expression that has a value 9590 // representable as an int. 9591 9592 // Complain if the value is not representable in an int. 9593 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9594 Diag(IdLoc, diag::ext_enum_value_not_int) 9595 << EnumVal.toString(10) << Val->getSourceRange() 9596 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9597 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9598 // Force the type of the expression to 'int'. 9599 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9600 } 9601 } 9602 9603 if (Enum->isFixed()) { 9604 EltTy = Enum->getIntegerType(); 9605 9606 // In Obj-C and Microsoft mode, require the enumeration value to be 9607 // representable in the underlying type of the enumeration. In C++11, 9608 // we perform a non-narrowing conversion as part of converted constant 9609 // expression checking. 9610 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9611 if (getLangOptions().MicrosoftExt) { 9612 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9613 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9614 } else 9615 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 9616 } else 9617 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9618 } else { 9619 // C++11 [dcl.enum]p5: 9620 // If the underlying type is not fixed, the type of each enumerator 9621 // is the type of its initializing value: 9622 // - If an initializer is specified for an enumerator, the 9623 // initializing value has the same type as the expression. 9624 EltTy = Val->getType(); 9625 } 9626 } 9627 } 9628 } 9629 9630 if (!Val) { 9631 if (Enum->isDependentType()) 9632 EltTy = Context.DependentTy; 9633 else if (!LastEnumConst) { 9634 // C++0x [dcl.enum]p5: 9635 // If the underlying type is not fixed, the type of each enumerator 9636 // is the type of its initializing value: 9637 // - If no initializer is specified for the first enumerator, the 9638 // initializing value has an unspecified integral type. 9639 // 9640 // GCC uses 'int' for its unspecified integral type, as does 9641 // C99 6.7.2.2p3. 9642 if (Enum->isFixed()) { 9643 EltTy = Enum->getIntegerType(); 9644 } 9645 else { 9646 EltTy = Context.IntTy; 9647 } 9648 } else { 9649 // Assign the last value + 1. 9650 EnumVal = LastEnumConst->getInitVal(); 9651 ++EnumVal; 9652 EltTy = LastEnumConst->getType(); 9653 9654 // Check for overflow on increment. 9655 if (EnumVal < LastEnumConst->getInitVal()) { 9656 // C++0x [dcl.enum]p5: 9657 // If the underlying type is not fixed, the type of each enumerator 9658 // is the type of its initializing value: 9659 // 9660 // - Otherwise the type of the initializing value is the same as 9661 // the type of the initializing value of the preceding enumerator 9662 // unless the incremented value is not representable in that type, 9663 // in which case the type is an unspecified integral type 9664 // sufficient to contain the incremented value. If no such type 9665 // exists, the program is ill-formed. 9666 QualType T = getNextLargerIntegralType(Context, EltTy); 9667 if (T.isNull() || Enum->isFixed()) { 9668 // There is no integral type larger enough to represent this 9669 // value. Complain, then allow the value to wrap around. 9670 EnumVal = LastEnumConst->getInitVal(); 9671 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9672 ++EnumVal; 9673 if (Enum->isFixed()) 9674 // When the underlying type is fixed, this is ill-formed. 9675 Diag(IdLoc, diag::err_enumerator_wrapped) 9676 << EnumVal.toString(10) 9677 << EltTy; 9678 else 9679 Diag(IdLoc, diag::warn_enumerator_too_large) 9680 << EnumVal.toString(10); 9681 } else { 9682 EltTy = T; 9683 } 9684 9685 // Retrieve the last enumerator's value, extent that type to the 9686 // type that is supposed to be large enough to represent the incremented 9687 // value, then increment. 9688 EnumVal = LastEnumConst->getInitVal(); 9689 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9690 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9691 ++EnumVal; 9692 9693 // If we're not in C++, diagnose the overflow of enumerator values, 9694 // which in C99 means that the enumerator value is not representable in 9695 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9696 // permits enumerator values that are representable in some larger 9697 // integral type. 9698 if (!getLangOptions().CPlusPlus && !T.isNull()) 9699 Diag(IdLoc, diag::warn_enum_value_overflow); 9700 } else if (!getLangOptions().CPlusPlus && 9701 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9702 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9703 Diag(IdLoc, diag::ext_enum_value_not_int) 9704 << EnumVal.toString(10) << 1; 9705 } 9706 } 9707 } 9708 9709 if (!EltTy->isDependentType()) { 9710 // Make the enumerator value match the signedness and size of the 9711 // enumerator's type. 9712 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9713 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9714 } 9715 9716 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9717 Val, EnumVal); 9718} 9719 9720 9721Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9722 SourceLocation IdLoc, IdentifierInfo *Id, 9723 AttributeList *Attr, 9724 SourceLocation EqualLoc, Expr *Val) { 9725 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9726 EnumConstantDecl *LastEnumConst = 9727 cast_or_null<EnumConstantDecl>(lastEnumConst); 9728 9729 // The scope passed in may not be a decl scope. Zip up the scope tree until 9730 // we find one that is. 9731 S = getNonFieldDeclScope(S); 9732 9733 // Verify that there isn't already something declared with this name in this 9734 // scope. 9735 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9736 ForRedeclaration); 9737 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9738 // Maybe we will complain about the shadowed template parameter. 9739 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9740 // Just pretend that we didn't see the previous declaration. 9741 PrevDecl = 0; 9742 } 9743 9744 if (PrevDecl) { 9745 // When in C++, we may get a TagDecl with the same name; in this case the 9746 // enum constant will 'hide' the tag. 9747 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9748 "Received TagDecl when not in C++!"); 9749 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9750 if (isa<EnumConstantDecl>(PrevDecl)) 9751 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9752 else 9753 Diag(IdLoc, diag::err_redefinition) << Id; 9754 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9755 return 0; 9756 } 9757 } 9758 9759 // C++ [class.mem]p13: 9760 // If T is the name of a class, then each of the following shall have a 9761 // name different from T: 9762 // - every enumerator of every member of class T that is an enumerated 9763 // type 9764 if (CXXRecordDecl *Record 9765 = dyn_cast<CXXRecordDecl>( 9766 TheEnumDecl->getDeclContext()->getRedeclContext())) 9767 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9768 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9769 9770 EnumConstantDecl *New = 9771 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9772 9773 if (New) { 9774 // Process attributes. 9775 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9776 9777 // Register this decl in the current scope stack. 9778 New->setAccess(TheEnumDecl->getAccess()); 9779 PushOnScopeChains(New, S); 9780 } 9781 9782 return New; 9783} 9784 9785void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9786 SourceLocation RBraceLoc, Decl *EnumDeclX, 9787 Decl **Elements, unsigned NumElements, 9788 Scope *S, AttributeList *Attr) { 9789 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9790 QualType EnumType = Context.getTypeDeclType(Enum); 9791 9792 if (Attr) 9793 ProcessDeclAttributeList(S, Enum, Attr); 9794 9795 if (Enum->isDependentType()) { 9796 for (unsigned i = 0; i != NumElements; ++i) { 9797 EnumConstantDecl *ECD = 9798 cast_or_null<EnumConstantDecl>(Elements[i]); 9799 if (!ECD) continue; 9800 9801 ECD->setType(EnumType); 9802 } 9803 9804 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9805 return; 9806 } 9807 9808 // TODO: If the result value doesn't fit in an int, it must be a long or long 9809 // long value. ISO C does not support this, but GCC does as an extension, 9810 // emit a warning. 9811 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9812 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9813 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9814 9815 // Verify that all the values are okay, compute the size of the values, and 9816 // reverse the list. 9817 unsigned NumNegativeBits = 0; 9818 unsigned NumPositiveBits = 0; 9819 9820 // Keep track of whether all elements have type int. 9821 bool AllElementsInt = true; 9822 9823 for (unsigned i = 0; i != NumElements; ++i) { 9824 EnumConstantDecl *ECD = 9825 cast_or_null<EnumConstantDecl>(Elements[i]); 9826 if (!ECD) continue; // Already issued a diagnostic. 9827 9828 const llvm::APSInt &InitVal = ECD->getInitVal(); 9829 9830 // Keep track of the size of positive and negative values. 9831 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9832 NumPositiveBits = std::max(NumPositiveBits, 9833 (unsigned)InitVal.getActiveBits()); 9834 else 9835 NumNegativeBits = std::max(NumNegativeBits, 9836 (unsigned)InitVal.getMinSignedBits()); 9837 9838 // Keep track of whether every enum element has type int (very commmon). 9839 if (AllElementsInt) 9840 AllElementsInt = ECD->getType() == Context.IntTy; 9841 } 9842 9843 // Figure out the type that should be used for this enum. 9844 QualType BestType; 9845 unsigned BestWidth; 9846 9847 // C++0x N3000 [conv.prom]p3: 9848 // An rvalue of an unscoped enumeration type whose underlying 9849 // type is not fixed can be converted to an rvalue of the first 9850 // of the following types that can represent all the values of 9851 // the enumeration: int, unsigned int, long int, unsigned long 9852 // int, long long int, or unsigned long long int. 9853 // C99 6.4.4.3p2: 9854 // An identifier declared as an enumeration constant has type int. 9855 // The C99 rule is modified by a gcc extension 9856 QualType BestPromotionType; 9857 9858 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9859 // -fshort-enums is the equivalent to specifying the packed attribute on all 9860 // enum definitions. 9861 if (LangOpts.ShortEnums) 9862 Packed = true; 9863 9864 if (Enum->isFixed()) { 9865 BestType = Enum->getIntegerType(); 9866 if (BestType->isPromotableIntegerType()) 9867 BestPromotionType = Context.getPromotedIntegerType(BestType); 9868 else 9869 BestPromotionType = BestType; 9870 // We don't need to set BestWidth, because BestType is going to be the type 9871 // of the enumerators, but we do anyway because otherwise some compilers 9872 // warn that it might be used uninitialized. 9873 BestWidth = CharWidth; 9874 } 9875 else if (NumNegativeBits) { 9876 // If there is a negative value, figure out the smallest integer type (of 9877 // int/long/longlong) that fits. 9878 // If it's packed, check also if it fits a char or a short. 9879 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9880 BestType = Context.SignedCharTy; 9881 BestWidth = CharWidth; 9882 } else if (Packed && NumNegativeBits <= ShortWidth && 9883 NumPositiveBits < ShortWidth) { 9884 BestType = Context.ShortTy; 9885 BestWidth = ShortWidth; 9886 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9887 BestType = Context.IntTy; 9888 BestWidth = IntWidth; 9889 } else { 9890 BestWidth = Context.getTargetInfo().getLongWidth(); 9891 9892 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9893 BestType = Context.LongTy; 9894 } else { 9895 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9896 9897 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9898 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9899 BestType = Context.LongLongTy; 9900 } 9901 } 9902 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9903 } else { 9904 // If there is no negative value, figure out the smallest type that fits 9905 // all of the enumerator values. 9906 // If it's packed, check also if it fits a char or a short. 9907 if (Packed && NumPositiveBits <= CharWidth) { 9908 BestType = Context.UnsignedCharTy; 9909 BestPromotionType = Context.IntTy; 9910 BestWidth = CharWidth; 9911 } else if (Packed && NumPositiveBits <= ShortWidth) { 9912 BestType = Context.UnsignedShortTy; 9913 BestPromotionType = Context.IntTy; 9914 BestWidth = ShortWidth; 9915 } else if (NumPositiveBits <= IntWidth) { 9916 BestType = Context.UnsignedIntTy; 9917 BestWidth = IntWidth; 9918 BestPromotionType 9919 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9920 ? Context.UnsignedIntTy : Context.IntTy; 9921 } else if (NumPositiveBits <= 9922 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9923 BestType = Context.UnsignedLongTy; 9924 BestPromotionType 9925 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9926 ? Context.UnsignedLongTy : Context.LongTy; 9927 } else { 9928 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9929 assert(NumPositiveBits <= BestWidth && 9930 "How could an initializer get larger than ULL?"); 9931 BestType = Context.UnsignedLongLongTy; 9932 BestPromotionType 9933 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9934 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9935 } 9936 } 9937 9938 // Loop over all of the enumerator constants, changing their types to match 9939 // the type of the enum if needed. 9940 for (unsigned i = 0; i != NumElements; ++i) { 9941 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9942 if (!ECD) continue; // Already issued a diagnostic. 9943 9944 // Standard C says the enumerators have int type, but we allow, as an 9945 // extension, the enumerators to be larger than int size. If each 9946 // enumerator value fits in an int, type it as an int, otherwise type it the 9947 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9948 // that X has type 'int', not 'unsigned'. 9949 9950 // Determine whether the value fits into an int. 9951 llvm::APSInt InitVal = ECD->getInitVal(); 9952 9953 // If it fits into an integer type, force it. Otherwise force it to match 9954 // the enum decl type. 9955 QualType NewTy; 9956 unsigned NewWidth; 9957 bool NewSign; 9958 if (!getLangOptions().CPlusPlus && 9959 !Enum->isFixed() && 9960 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9961 NewTy = Context.IntTy; 9962 NewWidth = IntWidth; 9963 NewSign = true; 9964 } else if (ECD->getType() == BestType) { 9965 // Already the right type! 9966 if (getLangOptions().CPlusPlus) 9967 // C++ [dcl.enum]p4: Following the closing brace of an 9968 // enum-specifier, each enumerator has the type of its 9969 // enumeration. 9970 ECD->setType(EnumType); 9971 continue; 9972 } else { 9973 NewTy = BestType; 9974 NewWidth = BestWidth; 9975 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9976 } 9977 9978 // Adjust the APSInt value. 9979 InitVal = InitVal.extOrTrunc(NewWidth); 9980 InitVal.setIsSigned(NewSign); 9981 ECD->setInitVal(InitVal); 9982 9983 // Adjust the Expr initializer and type. 9984 if (ECD->getInitExpr() && 9985 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9986 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9987 CK_IntegralCast, 9988 ECD->getInitExpr(), 9989 /*base paths*/ 0, 9990 VK_RValue)); 9991 if (getLangOptions().CPlusPlus) 9992 // C++ [dcl.enum]p4: Following the closing brace of an 9993 // enum-specifier, each enumerator has the type of its 9994 // enumeration. 9995 ECD->setType(EnumType); 9996 else 9997 ECD->setType(NewTy); 9998 } 9999 10000 Enum->completeDefinition(BestType, BestPromotionType, 10001 NumPositiveBits, NumNegativeBits); 10002} 10003 10004Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10005 SourceLocation StartLoc, 10006 SourceLocation EndLoc) { 10007 StringLiteral *AsmString = cast<StringLiteral>(expr); 10008 10009 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10010 AsmString, StartLoc, 10011 EndLoc); 10012 CurContext->addDecl(New); 10013 return New; 10014} 10015 10016DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10017 SourceLocation ImportLoc, 10018 ModuleIdPath Path) { 10019 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10020 Module::AllVisible, 10021 /*IsIncludeDirective=*/false); 10022 if (!Mod) 10023 return true; 10024 10025 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10026 Module *ModCheck = Mod; 10027 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10028 // If we've run out of module parents, just drop the remaining identifiers. 10029 // We need the length to be consistent. 10030 if (!ModCheck) 10031 break; 10032 ModCheck = ModCheck->Parent; 10033 10034 IdentifierLocs.push_back(Path[I].second); 10035 } 10036 10037 ImportDecl *Import = ImportDecl::Create(Context, 10038 Context.getTranslationUnitDecl(), 10039 AtLoc.isValid()? AtLoc : ImportLoc, 10040 Mod, IdentifierLocs); 10041 Context.getTranslationUnitDecl()->addDecl(Import); 10042 return Import; 10043} 10044 10045void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10046 SourceLocation PragmaLoc, 10047 SourceLocation NameLoc) { 10048 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10049 10050 if (PrevDecl) { 10051 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10052 } else { 10053 (void)WeakUndeclaredIdentifiers.insert( 10054 std::pair<IdentifierInfo*,WeakInfo> 10055 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10056 } 10057} 10058 10059void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10060 IdentifierInfo* AliasName, 10061 SourceLocation PragmaLoc, 10062 SourceLocation NameLoc, 10063 SourceLocation AliasNameLoc) { 10064 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10065 LookupOrdinaryName); 10066 WeakInfo W = WeakInfo(Name, NameLoc); 10067 10068 if (PrevDecl) { 10069 if (!PrevDecl->hasAttr<AliasAttr>()) 10070 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10071 DeclApplyPragmaWeak(TUScope, ND, W); 10072 } else { 10073 (void)WeakUndeclaredIdentifiers.insert( 10074 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10075 } 10076} 10077 10078Decl *Sema::getObjCDeclContext() const { 10079 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10080} 10081 10082AvailabilityResult Sema::getCurContextAvailability() const { 10083 const Decl *D = cast<Decl>(getCurLexicalContext()); 10084 // A category implicitly has the availability of the interface. 10085 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10086 D = CatD->getClassInterface(); 10087 10088 return D->getAvailability(); 10089} 10090