SemaDecl.cpp revision 282e7e66748cc6dd14d6f7f2cb52e5373c531e61
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 C11 feature; anonymous structures 2683/// are a C11 feature 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 && !getLangOptions().C11) 2691 Diag(Record->getLocation(), diag::ext_anonymous_union); 2692 else if (!Record->isUnion() && getLangOptions().CPlusPlus) 2693 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct); 2694 else if (!Record->isUnion() && !getLangOptions().C11) 2695 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct); 2696 2697 // C and C++ require different kinds of checks for anonymous 2698 // structs/unions. 2699 bool Invalid = false; 2700 if (getLangOptions().CPlusPlus) { 2701 const char* PrevSpec = 0; 2702 unsigned DiagID; 2703 if (Record->isUnion()) { 2704 // C++ [class.union]p6: 2705 // Anonymous unions declared in a named namespace or in the 2706 // global namespace shall be declared static. 2707 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2708 (isa<TranslationUnitDecl>(Owner) || 2709 (isa<NamespaceDecl>(Owner) && 2710 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2711 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2712 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2713 2714 // Recover by adding 'static'. 2715 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2716 PrevSpec, DiagID); 2717 } 2718 // C++ [class.union]p6: 2719 // A storage class is not allowed in a declaration of an 2720 // anonymous union in a class scope. 2721 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2722 isa<RecordDecl>(Owner)) { 2723 Diag(DS.getStorageClassSpecLoc(), 2724 diag::err_anonymous_union_with_storage_spec) 2725 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2726 2727 // Recover by removing the storage specifier. 2728 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2729 SourceLocation(), 2730 PrevSpec, DiagID); 2731 } 2732 } 2733 2734 // Ignore const/volatile/restrict qualifiers. 2735 if (DS.getTypeQualifiers()) { 2736 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2737 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2738 << Record->isUnion() << 0 2739 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2740 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2741 Diag(DS.getVolatileSpecLoc(), 2742 diag::ext_anonymous_struct_union_qualified) 2743 << Record->isUnion() << 1 2744 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2745 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2746 Diag(DS.getRestrictSpecLoc(), 2747 diag::ext_anonymous_struct_union_qualified) 2748 << Record->isUnion() << 2 2749 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2750 2751 DS.ClearTypeQualifiers(); 2752 } 2753 2754 // C++ [class.union]p2: 2755 // The member-specification of an anonymous union shall only 2756 // define non-static data members. [Note: nested types and 2757 // functions cannot be declared within an anonymous union. ] 2758 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2759 MemEnd = Record->decls_end(); 2760 Mem != MemEnd; ++Mem) { 2761 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2762 // C++ [class.union]p3: 2763 // An anonymous union shall not have private or protected 2764 // members (clause 11). 2765 assert(FD->getAccess() != AS_none); 2766 if (FD->getAccess() != AS_public) { 2767 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2768 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2769 Invalid = true; 2770 } 2771 2772 // C++ [class.union]p1 2773 // An object of a class with a non-trivial constructor, a non-trivial 2774 // copy constructor, a non-trivial destructor, or a non-trivial copy 2775 // assignment operator cannot be a member of a union, nor can an 2776 // array of such objects. 2777 if (CheckNontrivialField(FD)) 2778 Invalid = true; 2779 } else if ((*Mem)->isImplicit()) { 2780 // Any implicit members are fine. 2781 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2782 // This is a type that showed up in an 2783 // elaborated-type-specifier inside the anonymous struct or 2784 // union, but which actually declares a type outside of the 2785 // anonymous struct or union. It's okay. 2786 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2787 if (!MemRecord->isAnonymousStructOrUnion() && 2788 MemRecord->getDeclName()) { 2789 // Visual C++ allows type definition in anonymous struct or union. 2790 if (getLangOptions().MicrosoftExt) 2791 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2792 << (int)Record->isUnion(); 2793 else { 2794 // This is a nested type declaration. 2795 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2796 << (int)Record->isUnion(); 2797 Invalid = true; 2798 } 2799 } 2800 } else if (isa<AccessSpecDecl>(*Mem)) { 2801 // Any access specifier is fine. 2802 } else { 2803 // We have something that isn't a non-static data 2804 // member. Complain about it. 2805 unsigned DK = diag::err_anonymous_record_bad_member; 2806 if (isa<TypeDecl>(*Mem)) 2807 DK = diag::err_anonymous_record_with_type; 2808 else if (isa<FunctionDecl>(*Mem)) 2809 DK = diag::err_anonymous_record_with_function; 2810 else if (isa<VarDecl>(*Mem)) 2811 DK = diag::err_anonymous_record_with_static; 2812 2813 // Visual C++ allows type definition in anonymous struct or union. 2814 if (getLangOptions().MicrosoftExt && 2815 DK == diag::err_anonymous_record_with_type) 2816 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2817 << (int)Record->isUnion(); 2818 else { 2819 Diag((*Mem)->getLocation(), DK) 2820 << (int)Record->isUnion(); 2821 Invalid = true; 2822 } 2823 } 2824 } 2825 } 2826 2827 if (!Record->isUnion() && !Owner->isRecord()) { 2828 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2829 << (int)getLangOptions().CPlusPlus; 2830 Invalid = true; 2831 } 2832 2833 // Mock up a declarator. 2834 Declarator Dc(DS, Declarator::MemberContext); 2835 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2836 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2837 2838 // Create a declaration for this anonymous struct/union. 2839 NamedDecl *Anon = 0; 2840 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2841 Anon = FieldDecl::Create(Context, OwningClass, 2842 DS.getSourceRange().getBegin(), 2843 Record->getLocation(), 2844 /*IdentifierInfo=*/0, 2845 Context.getTypeDeclType(Record), 2846 TInfo, 2847 /*BitWidth=*/0, /*Mutable=*/false, 2848 /*HasInit=*/false); 2849 Anon->setAccess(AS); 2850 if (getLangOptions().CPlusPlus) 2851 FieldCollector->Add(cast<FieldDecl>(Anon)); 2852 } else { 2853 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2854 assert(SCSpec != DeclSpec::SCS_typedef && 2855 "Parser allowed 'typedef' as storage class VarDecl."); 2856 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2857 if (SCSpec == DeclSpec::SCS_mutable) { 2858 // mutable can only appear on non-static class members, so it's always 2859 // an error here 2860 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2861 Invalid = true; 2862 SC = SC_None; 2863 } 2864 SCSpec = DS.getStorageClassSpecAsWritten(); 2865 VarDecl::StorageClass SCAsWritten 2866 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2867 2868 Anon = VarDecl::Create(Context, Owner, 2869 DS.getSourceRange().getBegin(), 2870 Record->getLocation(), /*IdentifierInfo=*/0, 2871 Context.getTypeDeclType(Record), 2872 TInfo, SC, SCAsWritten); 2873 2874 // Default-initialize the implicit variable. This initialization will be 2875 // trivial in almost all cases, except if a union member has an in-class 2876 // initializer: 2877 // union { int n = 0; }; 2878 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2879 } 2880 Anon->setImplicit(); 2881 2882 // Add the anonymous struct/union object to the current 2883 // context. We'll be referencing this object when we refer to one of 2884 // its members. 2885 Owner->addDecl(Anon); 2886 2887 // Inject the members of the anonymous struct/union into the owning 2888 // context and into the identifier resolver chain for name lookup 2889 // purposes. 2890 SmallVector<NamedDecl*, 2> Chain; 2891 Chain.push_back(Anon); 2892 2893 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2894 Chain, false)) 2895 Invalid = true; 2896 2897 // Mark this as an anonymous struct/union type. Note that we do not 2898 // do this until after we have already checked and injected the 2899 // members of this anonymous struct/union type, because otherwise 2900 // the members could be injected twice: once by DeclContext when it 2901 // builds its lookup table, and once by 2902 // InjectAnonymousStructOrUnionMembers. 2903 Record->setAnonymousStructOrUnion(true); 2904 2905 if (Invalid) 2906 Anon->setInvalidDecl(); 2907 2908 return Anon; 2909} 2910 2911/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2912/// Microsoft C anonymous structure. 2913/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2914/// Example: 2915/// 2916/// struct A { int a; }; 2917/// struct B { struct A; int b; }; 2918/// 2919/// void foo() { 2920/// B var; 2921/// var.a = 3; 2922/// } 2923/// 2924Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2925 RecordDecl *Record) { 2926 2927 // If there is no Record, get the record via the typedef. 2928 if (!Record) 2929 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2930 2931 // Mock up a declarator. 2932 Declarator Dc(DS, Declarator::TypeNameContext); 2933 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2934 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2935 2936 // Create a declaration for this anonymous struct. 2937 NamedDecl* Anon = FieldDecl::Create(Context, 2938 cast<RecordDecl>(CurContext), 2939 DS.getSourceRange().getBegin(), 2940 DS.getSourceRange().getBegin(), 2941 /*IdentifierInfo=*/0, 2942 Context.getTypeDeclType(Record), 2943 TInfo, 2944 /*BitWidth=*/0, /*Mutable=*/false, 2945 /*HasInit=*/false); 2946 Anon->setImplicit(); 2947 2948 // Add the anonymous struct object to the current context. 2949 CurContext->addDecl(Anon); 2950 2951 // Inject the members of the anonymous struct into the current 2952 // context and into the identifier resolver chain for name lookup 2953 // purposes. 2954 SmallVector<NamedDecl*, 2> Chain; 2955 Chain.push_back(Anon); 2956 2957 RecordDecl *RecordDef = Record->getDefinition(); 2958 if (!RecordDef || InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2959 RecordDef, AS_none, 2960 Chain, true)) 2961 Anon->setInvalidDecl(); 2962 2963 return Anon; 2964} 2965 2966/// GetNameForDeclarator - Determine the full declaration name for the 2967/// given Declarator. 2968DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2969 return GetNameFromUnqualifiedId(D.getName()); 2970} 2971 2972/// \brief Retrieves the declaration name from a parsed unqualified-id. 2973DeclarationNameInfo 2974Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2975 DeclarationNameInfo NameInfo; 2976 NameInfo.setLoc(Name.StartLocation); 2977 2978 switch (Name.getKind()) { 2979 2980 case UnqualifiedId::IK_ImplicitSelfParam: 2981 case UnqualifiedId::IK_Identifier: 2982 NameInfo.setName(Name.Identifier); 2983 NameInfo.setLoc(Name.StartLocation); 2984 return NameInfo; 2985 2986 case UnqualifiedId::IK_OperatorFunctionId: 2987 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2988 Name.OperatorFunctionId.Operator)); 2989 NameInfo.setLoc(Name.StartLocation); 2990 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2991 = Name.OperatorFunctionId.SymbolLocations[0]; 2992 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2993 = Name.EndLocation.getRawEncoding(); 2994 return NameInfo; 2995 2996 case UnqualifiedId::IK_LiteralOperatorId: 2997 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2998 Name.Identifier)); 2999 NameInfo.setLoc(Name.StartLocation); 3000 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 3001 return NameInfo; 3002 3003 case UnqualifiedId::IK_ConversionFunctionId: { 3004 TypeSourceInfo *TInfo; 3005 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 3006 if (Ty.isNull()) 3007 return DeclarationNameInfo(); 3008 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 3009 Context.getCanonicalType(Ty))); 3010 NameInfo.setLoc(Name.StartLocation); 3011 NameInfo.setNamedTypeInfo(TInfo); 3012 return NameInfo; 3013 } 3014 3015 case UnqualifiedId::IK_ConstructorName: { 3016 TypeSourceInfo *TInfo; 3017 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 3018 if (Ty.isNull()) 3019 return DeclarationNameInfo(); 3020 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3021 Context.getCanonicalType(Ty))); 3022 NameInfo.setLoc(Name.StartLocation); 3023 NameInfo.setNamedTypeInfo(TInfo); 3024 return NameInfo; 3025 } 3026 3027 case UnqualifiedId::IK_ConstructorTemplateId: { 3028 // In well-formed code, we can only have a constructor 3029 // template-id that refers to the current context, so go there 3030 // to find the actual type being constructed. 3031 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 3032 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 3033 return DeclarationNameInfo(); 3034 3035 // Determine the type of the class being constructed. 3036 QualType CurClassType = Context.getTypeDeclType(CurClass); 3037 3038 // FIXME: Check two things: that the template-id names the same type as 3039 // CurClassType, and that the template-id does not occur when the name 3040 // was qualified. 3041 3042 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3043 Context.getCanonicalType(CurClassType))); 3044 NameInfo.setLoc(Name.StartLocation); 3045 // FIXME: should we retrieve TypeSourceInfo? 3046 NameInfo.setNamedTypeInfo(0); 3047 return NameInfo; 3048 } 3049 3050 case UnqualifiedId::IK_DestructorName: { 3051 TypeSourceInfo *TInfo; 3052 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3053 if (Ty.isNull()) 3054 return DeclarationNameInfo(); 3055 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3056 Context.getCanonicalType(Ty))); 3057 NameInfo.setLoc(Name.StartLocation); 3058 NameInfo.setNamedTypeInfo(TInfo); 3059 return NameInfo; 3060 } 3061 3062 case UnqualifiedId::IK_TemplateId: { 3063 TemplateName TName = Name.TemplateId->Template.get(); 3064 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3065 return Context.getNameForTemplate(TName, TNameLoc); 3066 } 3067 3068 } // switch (Name.getKind()) 3069 3070 llvm_unreachable("Unknown name kind"); 3071} 3072 3073static QualType getCoreType(QualType Ty) { 3074 do { 3075 if (Ty->isPointerType() || Ty->isReferenceType()) 3076 Ty = Ty->getPointeeType(); 3077 else if (Ty->isArrayType()) 3078 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3079 else 3080 return Ty.withoutLocalFastQualifiers(); 3081 } while (true); 3082} 3083 3084/// hasSimilarParameters - Determine whether the C++ functions Declaration 3085/// and Definition have "nearly" matching parameters. This heuristic is 3086/// used to improve diagnostics in the case where an out-of-line function 3087/// definition doesn't match any declaration within the class or namespace. 3088/// Also sets Params to the list of indices to the parameters that differ 3089/// between the declaration and the definition. If hasSimilarParameters 3090/// returns true and Params is empty, then all of the parameters match. 3091static bool hasSimilarParameters(ASTContext &Context, 3092 FunctionDecl *Declaration, 3093 FunctionDecl *Definition, 3094 llvm::SmallVectorImpl<unsigned> &Params) { 3095 Params.clear(); 3096 if (Declaration->param_size() != Definition->param_size()) 3097 return false; 3098 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3099 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3100 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3101 3102 // The parameter types are identical 3103 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3104 continue; 3105 3106 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3107 QualType DefParamBaseTy = getCoreType(DefParamTy); 3108 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3109 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3110 3111 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3112 (DeclTyName && DeclTyName == DefTyName)) 3113 Params.push_back(Idx); 3114 else // The two parameters aren't even close 3115 return false; 3116 } 3117 3118 return true; 3119} 3120 3121/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3122/// declarator needs to be rebuilt in the current instantiation. 3123/// Any bits of declarator which appear before the name are valid for 3124/// consideration here. That's specifically the type in the decl spec 3125/// and the base type in any member-pointer chunks. 3126static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3127 DeclarationName Name) { 3128 // The types we specifically need to rebuild are: 3129 // - typenames, typeofs, and decltypes 3130 // - types which will become injected class names 3131 // Of course, we also need to rebuild any type referencing such a 3132 // type. It's safest to just say "dependent", but we call out a 3133 // few cases here. 3134 3135 DeclSpec &DS = D.getMutableDeclSpec(); 3136 switch (DS.getTypeSpecType()) { 3137 case DeclSpec::TST_typename: 3138 case DeclSpec::TST_typeofType: 3139 case DeclSpec::TST_decltype: 3140 case DeclSpec::TST_underlyingType: 3141 case DeclSpec::TST_atomic: { 3142 // Grab the type from the parser. 3143 TypeSourceInfo *TSI = 0; 3144 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3145 if (T.isNull() || !T->isDependentType()) break; 3146 3147 // Make sure there's a type source info. This isn't really much 3148 // of a waste; most dependent types should have type source info 3149 // attached already. 3150 if (!TSI) 3151 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3152 3153 // Rebuild the type in the current instantiation. 3154 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3155 if (!TSI) return true; 3156 3157 // Store the new type back in the decl spec. 3158 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3159 DS.UpdateTypeRep(LocType); 3160 break; 3161 } 3162 3163 case DeclSpec::TST_typeofExpr: { 3164 Expr *E = DS.getRepAsExpr(); 3165 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3166 if (Result.isInvalid()) return true; 3167 DS.UpdateExprRep(Result.get()); 3168 break; 3169 } 3170 3171 default: 3172 // Nothing to do for these decl specs. 3173 break; 3174 } 3175 3176 // It doesn't matter what order we do this in. 3177 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3178 DeclaratorChunk &Chunk = D.getTypeObject(I); 3179 3180 // The only type information in the declarator which can come 3181 // before the declaration name is the base type of a member 3182 // pointer. 3183 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3184 continue; 3185 3186 // Rebuild the scope specifier in-place. 3187 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3188 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3189 return true; 3190 } 3191 3192 return false; 3193} 3194 3195Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3196 D.setFunctionDefinitionKind(FDK_Declaration); 3197 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3198 3199 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3200 Dcl->getDeclContext()->isFileContext()) 3201 Dcl->setTopLevelDeclInObjCContainer(); 3202 3203 return Dcl; 3204} 3205 3206/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3207/// If T is the name of a class, then each of the following shall have a 3208/// name different from T: 3209/// - every static data member of class T; 3210/// - every member function of class T 3211/// - every member of class T that is itself a type; 3212/// \returns true if the declaration name violates these rules. 3213bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3214 DeclarationNameInfo NameInfo) { 3215 DeclarationName Name = NameInfo.getName(); 3216 3217 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3218 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3219 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3220 return true; 3221 } 3222 3223 return false; 3224} 3225 3226Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3227 MultiTemplateParamsArg TemplateParamLists) { 3228 // TODO: consider using NameInfo for diagnostic. 3229 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3230 DeclarationName Name = NameInfo.getName(); 3231 3232 // All of these full declarators require an identifier. If it doesn't have 3233 // one, the ParsedFreeStandingDeclSpec action should be used. 3234 if (!Name) { 3235 if (!D.isInvalidType()) // Reject this if we think it is valid. 3236 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3237 diag::err_declarator_need_ident) 3238 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3239 return 0; 3240 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3241 return 0; 3242 3243 // The scope passed in may not be a decl scope. Zip up the scope tree until 3244 // we find one that is. 3245 while ((S->getFlags() & Scope::DeclScope) == 0 || 3246 (S->getFlags() & Scope::TemplateParamScope) != 0) 3247 S = S->getParent(); 3248 3249 DeclContext *DC = CurContext; 3250 if (D.getCXXScopeSpec().isInvalid()) 3251 D.setInvalidType(); 3252 else if (D.getCXXScopeSpec().isSet()) { 3253 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3254 UPPC_DeclarationQualifier)) 3255 return 0; 3256 3257 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3258 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3259 if (!DC) { 3260 // If we could not compute the declaration context, it's because the 3261 // declaration context is dependent but does not refer to a class, 3262 // class template, or class template partial specialization. Complain 3263 // and return early, to avoid the coming semantic disaster. 3264 Diag(D.getIdentifierLoc(), 3265 diag::err_template_qualified_declarator_no_match) 3266 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3267 << D.getCXXScopeSpec().getRange(); 3268 return 0; 3269 } 3270 bool IsDependentContext = DC->isDependentContext(); 3271 3272 if (!IsDependentContext && 3273 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3274 return 0; 3275 3276 if (isa<CXXRecordDecl>(DC)) { 3277 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3278 Diag(D.getIdentifierLoc(), 3279 diag::err_member_def_undefined_record) 3280 << Name << DC << D.getCXXScopeSpec().getRange(); 3281 D.setInvalidType(); 3282 } else if (isa<CXXRecordDecl>(CurContext) && 3283 !D.getDeclSpec().isFriendSpecified()) { 3284 // The user provided a superfluous scope specifier inside a class 3285 // definition: 3286 // 3287 // class X { 3288 // void X::f(); 3289 // }; 3290 if (CurContext->Equals(DC)) { 3291 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3292 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3293 } else { 3294 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3295 << Name << D.getCXXScopeSpec().getRange(); 3296 3297 // C++ constructors and destructors with incorrect scopes can break 3298 // our AST invariants by having the wrong underlying types. If 3299 // that's the case, then drop this declaration entirely. 3300 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3301 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3302 !Context.hasSameType(Name.getCXXNameType(), 3303 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3304 return 0; 3305 } 3306 3307 // Pretend that this qualifier was not here. 3308 D.getCXXScopeSpec().clear(); 3309 } 3310 } 3311 3312 // Check whether we need to rebuild the type of the given 3313 // declaration in the current instantiation. 3314 if (EnteringContext && IsDependentContext && 3315 TemplateParamLists.size() != 0) { 3316 ContextRAII SavedContext(*this, DC); 3317 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3318 D.setInvalidType(); 3319 } 3320 } 3321 3322 if (DiagnoseClassNameShadow(DC, NameInfo)) 3323 // If this is a typedef, we'll end up spewing multiple diagnostics. 3324 // Just return early; it's safer. 3325 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3326 return 0; 3327 3328 NamedDecl *New; 3329 3330 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3331 QualType R = TInfo->getType(); 3332 3333 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3334 UPPC_DeclarationType)) 3335 D.setInvalidType(); 3336 3337 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3338 ForRedeclaration); 3339 3340 // See if this is a redefinition of a variable in the same scope. 3341 if (!D.getCXXScopeSpec().isSet()) { 3342 bool IsLinkageLookup = false; 3343 3344 // If the declaration we're planning to build will be a function 3345 // or object with linkage, then look for another declaration with 3346 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3347 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3348 /* Do nothing*/; 3349 else if (R->isFunctionType()) { 3350 if (CurContext->isFunctionOrMethod() || 3351 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3352 IsLinkageLookup = true; 3353 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3354 IsLinkageLookup = true; 3355 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3356 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3357 IsLinkageLookup = true; 3358 3359 if (IsLinkageLookup) 3360 Previous.clear(LookupRedeclarationWithLinkage); 3361 3362 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3363 } else { // Something like "int foo::x;" 3364 LookupQualifiedName(Previous, DC); 3365 3366 // Don't consider using declarations as previous declarations for 3367 // out-of-line members. 3368 RemoveUsingDecls(Previous); 3369 3370 // C++ 7.3.1.2p2: 3371 // Members (including explicit specializations of templates) of a named 3372 // namespace can also be defined outside that namespace by explicit 3373 // qualification of the name being defined, provided that the entity being 3374 // defined was already declared in the namespace and the definition appears 3375 // after the point of declaration in a namespace that encloses the 3376 // declarations namespace. 3377 // 3378 // Note that we only check the context at this point. We don't yet 3379 // have enough information to make sure that PrevDecl is actually 3380 // the declaration we want to match. For example, given: 3381 // 3382 // class X { 3383 // void f(); 3384 // void f(float); 3385 // }; 3386 // 3387 // void X::f(int) { } // ill-formed 3388 // 3389 // In this case, PrevDecl will point to the overload set 3390 // containing the two f's declared in X, but neither of them 3391 // matches. 3392 3393 // First check whether we named the global scope. 3394 if (isa<TranslationUnitDecl>(DC)) { 3395 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3396 << Name << D.getCXXScopeSpec().getRange(); 3397 } else { 3398 DeclContext *Cur = CurContext; 3399 while (isa<LinkageSpecDecl>(Cur)) 3400 Cur = Cur->getParent(); 3401 if (!Cur->Encloses(DC)) { 3402 // The qualifying scope doesn't enclose the original declaration. 3403 // Emit diagnostic based on current scope. 3404 SourceLocation L = D.getIdentifierLoc(); 3405 SourceRange R = D.getCXXScopeSpec().getRange(); 3406 if (isa<FunctionDecl>(Cur)) 3407 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3408 else 3409 Diag(L, diag::err_invalid_declarator_scope) 3410 << Name << cast<NamedDecl>(DC) << R; 3411 D.setInvalidType(); 3412 } 3413 3414 // C++11 8.3p1: 3415 // ... "The nested-name-specifier of the qualified declarator-id shall 3416 // not begin with a decltype-specifer" 3417 NestedNameSpecifierLoc SpecLoc = 3418 D.getCXXScopeSpec().getWithLocInContext(Context); 3419 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3420 "NestedNameSpecifierLoc"); 3421 while (SpecLoc.getPrefix()) 3422 SpecLoc = SpecLoc.getPrefix(); 3423 if (dyn_cast_or_null<DecltypeType>( 3424 SpecLoc.getNestedNameSpecifier()->getAsType())) 3425 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3426 << SpecLoc.getTypeLoc().getSourceRange(); 3427 } 3428 } 3429 3430 if (Previous.isSingleResult() && 3431 Previous.getFoundDecl()->isTemplateParameter()) { 3432 // Maybe we will complain about the shadowed template parameter. 3433 if (!D.isInvalidType()) 3434 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3435 Previous.getFoundDecl()); 3436 3437 // Just pretend that we didn't see the previous declaration. 3438 Previous.clear(); 3439 } 3440 3441 // In C++, the previous declaration we find might be a tag type 3442 // (class or enum). In this case, the new declaration will hide the 3443 // tag type. Note that this does does not apply if we're declaring a 3444 // typedef (C++ [dcl.typedef]p4). 3445 if (Previous.isSingleTagDecl() && 3446 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3447 Previous.clear(); 3448 3449 bool AddToScope = true; 3450 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3451 if (TemplateParamLists.size()) { 3452 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3453 return 0; 3454 } 3455 3456 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3457 } else if (R->isFunctionType()) { 3458 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3459 move(TemplateParamLists), 3460 AddToScope); 3461 } else { 3462 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3463 move(TemplateParamLists)); 3464 } 3465 3466 if (New == 0) 3467 return 0; 3468 3469 // If this has an identifier and is not an invalid redeclaration or 3470 // function template specialization, add it to the scope stack. 3471 if (New->getDeclName() && AddToScope && 3472 !(D.isRedeclaration() && New->isInvalidDecl())) 3473 PushOnScopeChains(New, S); 3474 3475 return New; 3476} 3477 3478/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3479/// types into constant array types in certain situations which would otherwise 3480/// be errors (for GCC compatibility). 3481static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3482 ASTContext &Context, 3483 bool &SizeIsNegative, 3484 llvm::APSInt &Oversized) { 3485 // This method tries to turn a variable array into a constant 3486 // array even when the size isn't an ICE. This is necessary 3487 // for compatibility with code that depends on gcc's buggy 3488 // constant expression folding, like struct {char x[(int)(char*)2];} 3489 SizeIsNegative = false; 3490 Oversized = 0; 3491 3492 if (T->isDependentType()) 3493 return QualType(); 3494 3495 QualifierCollector Qs; 3496 const Type *Ty = Qs.strip(T); 3497 3498 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3499 QualType Pointee = PTy->getPointeeType(); 3500 QualType FixedType = 3501 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3502 Oversized); 3503 if (FixedType.isNull()) return FixedType; 3504 FixedType = Context.getPointerType(FixedType); 3505 return Qs.apply(Context, FixedType); 3506 } 3507 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3508 QualType Inner = PTy->getInnerType(); 3509 QualType FixedType = 3510 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3511 Oversized); 3512 if (FixedType.isNull()) return FixedType; 3513 FixedType = Context.getParenType(FixedType); 3514 return Qs.apply(Context, FixedType); 3515 } 3516 3517 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3518 if (!VLATy) 3519 return QualType(); 3520 // FIXME: We should probably handle this case 3521 if (VLATy->getElementType()->isVariablyModifiedType()) 3522 return QualType(); 3523 3524 llvm::APSInt Res; 3525 if (!VLATy->getSizeExpr() || 3526 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3527 return QualType(); 3528 3529 // Check whether the array size is negative. 3530 if (Res.isSigned() && Res.isNegative()) { 3531 SizeIsNegative = true; 3532 return QualType(); 3533 } 3534 3535 // Check whether the array is too large to be addressed. 3536 unsigned ActiveSizeBits 3537 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3538 Res); 3539 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3540 Oversized = Res; 3541 return QualType(); 3542 } 3543 3544 return Context.getConstantArrayType(VLATy->getElementType(), 3545 Res, ArrayType::Normal, 0); 3546} 3547 3548/// \brief Register the given locally-scoped external C declaration so 3549/// that it can be found later for redeclarations 3550void 3551Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3552 const LookupResult &Previous, 3553 Scope *S) { 3554 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3555 "Decl is not a locally-scoped decl!"); 3556 // Note that we have a locally-scoped external with this name. 3557 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3558 3559 if (!Previous.isSingleResult()) 3560 return; 3561 3562 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3563 3564 // If there was a previous declaration of this variable, it may be 3565 // in our identifier chain. Update the identifier chain with the new 3566 // declaration. 3567 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3568 // The previous declaration was found on the identifer resolver 3569 // chain, so remove it from its scope. 3570 3571 if (S->isDeclScope(PrevDecl)) { 3572 // Special case for redeclarations in the SAME scope. 3573 // Because this declaration is going to be added to the identifier chain 3574 // later, we should temporarily take it OFF the chain. 3575 IdResolver.RemoveDecl(ND); 3576 3577 } else { 3578 // Find the scope for the original declaration. 3579 while (S && !S->isDeclScope(PrevDecl)) 3580 S = S->getParent(); 3581 } 3582 3583 if (S) 3584 S->RemoveDecl(PrevDecl); 3585 } 3586} 3587 3588llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3589Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3590 if (ExternalSource) { 3591 // Load locally-scoped external decls from the external source. 3592 SmallVector<NamedDecl *, 4> Decls; 3593 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3594 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3595 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3596 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3597 if (Pos == LocallyScopedExternalDecls.end()) 3598 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3599 } 3600 } 3601 3602 return LocallyScopedExternalDecls.find(Name); 3603} 3604 3605/// \brief Diagnose function specifiers on a declaration of an identifier that 3606/// does not identify a function. 3607void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3608 // FIXME: We should probably indicate the identifier in question to avoid 3609 // confusion for constructs like "inline int a(), b;" 3610 if (D.getDeclSpec().isInlineSpecified()) 3611 Diag(D.getDeclSpec().getInlineSpecLoc(), 3612 diag::err_inline_non_function); 3613 3614 if (D.getDeclSpec().isVirtualSpecified()) 3615 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3616 diag::err_virtual_non_function); 3617 3618 if (D.getDeclSpec().isExplicitSpecified()) 3619 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3620 diag::err_explicit_non_function); 3621} 3622 3623NamedDecl* 3624Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3625 TypeSourceInfo *TInfo, LookupResult &Previous) { 3626 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3627 if (D.getCXXScopeSpec().isSet()) { 3628 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3629 << D.getCXXScopeSpec().getRange(); 3630 D.setInvalidType(); 3631 // Pretend we didn't see the scope specifier. 3632 DC = CurContext; 3633 Previous.clear(); 3634 } 3635 3636 if (getLangOptions().CPlusPlus) { 3637 // Check that there are no default arguments (C++ only). 3638 CheckExtraCXXDefaultArguments(D); 3639 } 3640 3641 DiagnoseFunctionSpecifiers(D); 3642 3643 if (D.getDeclSpec().isThreadSpecified()) 3644 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3645 if (D.getDeclSpec().isConstexprSpecified()) 3646 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3647 << 1; 3648 3649 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3650 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3651 << D.getName().getSourceRange(); 3652 return 0; 3653 } 3654 3655 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3656 if (!NewTD) return 0; 3657 3658 // Handle attributes prior to checking for duplicates in MergeVarDecl 3659 ProcessDeclAttributes(S, NewTD, D); 3660 3661 CheckTypedefForVariablyModifiedType(S, NewTD); 3662 3663 bool Redeclaration = D.isRedeclaration(); 3664 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3665 D.setRedeclaration(Redeclaration); 3666 return ND; 3667} 3668 3669void 3670Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3671 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3672 // then it shall have block scope. 3673 // Note that variably modified types must be fixed before merging the decl so 3674 // that redeclarations will match. 3675 QualType T = NewTD->getUnderlyingType(); 3676 if (T->isVariablyModifiedType()) { 3677 getCurFunction()->setHasBranchProtectedScope(); 3678 3679 if (S->getFnParent() == 0) { 3680 bool SizeIsNegative; 3681 llvm::APSInt Oversized; 3682 QualType FixedTy = 3683 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3684 Oversized); 3685 if (!FixedTy.isNull()) { 3686 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3687 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3688 } else { 3689 if (SizeIsNegative) 3690 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3691 else if (T->isVariableArrayType()) 3692 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3693 else if (Oversized.getBoolValue()) 3694 Diag(NewTD->getLocation(), diag::err_array_too_large) 3695 << Oversized.toString(10); 3696 else 3697 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3698 NewTD->setInvalidDecl(); 3699 } 3700 } 3701 } 3702} 3703 3704 3705/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3706/// declares a typedef-name, either using the 'typedef' type specifier or via 3707/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3708NamedDecl* 3709Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3710 LookupResult &Previous, bool &Redeclaration) { 3711 // Merge the decl with the existing one if appropriate. If the decl is 3712 // in an outer scope, it isn't the same thing. 3713 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3714 /*ExplicitInstantiationOrSpecialization=*/false); 3715 if (!Previous.empty()) { 3716 Redeclaration = true; 3717 MergeTypedefNameDecl(NewTD, Previous); 3718 } 3719 3720 // If this is the C FILE type, notify the AST context. 3721 if (IdentifierInfo *II = NewTD->getIdentifier()) 3722 if (!NewTD->isInvalidDecl() && 3723 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3724 if (II->isStr("FILE")) 3725 Context.setFILEDecl(NewTD); 3726 else if (II->isStr("jmp_buf")) 3727 Context.setjmp_bufDecl(NewTD); 3728 else if (II->isStr("sigjmp_buf")) 3729 Context.setsigjmp_bufDecl(NewTD); 3730 else if (II->isStr("ucontext_t")) 3731 Context.setucontext_tDecl(NewTD); 3732 else if (II->isStr("__builtin_va_list")) 3733 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3734 } 3735 3736 return NewTD; 3737} 3738 3739/// \brief Determines whether the given declaration is an out-of-scope 3740/// previous declaration. 3741/// 3742/// This routine should be invoked when name lookup has found a 3743/// previous declaration (PrevDecl) that is not in the scope where a 3744/// new declaration by the same name is being introduced. If the new 3745/// declaration occurs in a local scope, previous declarations with 3746/// linkage may still be considered previous declarations (C99 3747/// 6.2.2p4-5, C++ [basic.link]p6). 3748/// 3749/// \param PrevDecl the previous declaration found by name 3750/// lookup 3751/// 3752/// \param DC the context in which the new declaration is being 3753/// declared. 3754/// 3755/// \returns true if PrevDecl is an out-of-scope previous declaration 3756/// for a new delcaration with the same name. 3757static bool 3758isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3759 ASTContext &Context) { 3760 if (!PrevDecl) 3761 return false; 3762 3763 if (!PrevDecl->hasLinkage()) 3764 return false; 3765 3766 if (Context.getLangOptions().CPlusPlus) { 3767 // C++ [basic.link]p6: 3768 // If there is a visible declaration of an entity with linkage 3769 // having the same name and type, ignoring entities declared 3770 // outside the innermost enclosing namespace scope, the block 3771 // scope declaration declares that same entity and receives the 3772 // linkage of the previous declaration. 3773 DeclContext *OuterContext = DC->getRedeclContext(); 3774 if (!OuterContext->isFunctionOrMethod()) 3775 // This rule only applies to block-scope declarations. 3776 return false; 3777 3778 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3779 if (PrevOuterContext->isRecord()) 3780 // We found a member function: ignore it. 3781 return false; 3782 3783 // Find the innermost enclosing namespace for the new and 3784 // previous declarations. 3785 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3786 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3787 3788 // The previous declaration is in a different namespace, so it 3789 // isn't the same function. 3790 if (!OuterContext->Equals(PrevOuterContext)) 3791 return false; 3792 } 3793 3794 return true; 3795} 3796 3797static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3798 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3799 if (!SS.isSet()) return; 3800 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3801} 3802 3803bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3804 QualType type = decl->getType(); 3805 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3806 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3807 // Various kinds of declaration aren't allowed to be __autoreleasing. 3808 unsigned kind = -1U; 3809 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3810 if (var->hasAttr<BlocksAttr>()) 3811 kind = 0; // __block 3812 else if (!var->hasLocalStorage()) 3813 kind = 1; // global 3814 } else if (isa<ObjCIvarDecl>(decl)) { 3815 kind = 3; // ivar 3816 } else if (isa<FieldDecl>(decl)) { 3817 kind = 2; // field 3818 } 3819 3820 if (kind != -1U) { 3821 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3822 << kind; 3823 } 3824 } else if (lifetime == Qualifiers::OCL_None) { 3825 // Try to infer lifetime. 3826 if (!type->isObjCLifetimeType()) 3827 return false; 3828 3829 lifetime = type->getObjCARCImplicitLifetime(); 3830 type = Context.getLifetimeQualifiedType(type, lifetime); 3831 decl->setType(type); 3832 } 3833 3834 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3835 // Thread-local variables cannot have lifetime. 3836 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3837 var->isThreadSpecified()) { 3838 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3839 << var->getType(); 3840 return true; 3841 } 3842 } 3843 3844 return false; 3845} 3846 3847NamedDecl* 3848Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3849 TypeSourceInfo *TInfo, LookupResult &Previous, 3850 MultiTemplateParamsArg TemplateParamLists) { 3851 QualType R = TInfo->getType(); 3852 DeclarationName Name = GetNameForDeclarator(D).getName(); 3853 3854 // Check that there are no default arguments (C++ only). 3855 if (getLangOptions().CPlusPlus) 3856 CheckExtraCXXDefaultArguments(D); 3857 3858 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3859 assert(SCSpec != DeclSpec::SCS_typedef && 3860 "Parser allowed 'typedef' as storage class VarDecl."); 3861 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3862 if (SCSpec == DeclSpec::SCS_mutable) { 3863 // mutable can only appear on non-static class members, so it's always 3864 // an error here 3865 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3866 D.setInvalidType(); 3867 SC = SC_None; 3868 } 3869 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3870 VarDecl::StorageClass SCAsWritten 3871 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3872 3873 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3874 if (!II) { 3875 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3876 << Name; 3877 return 0; 3878 } 3879 3880 DiagnoseFunctionSpecifiers(D); 3881 3882 if (!DC->isRecord() && S->getFnParent() == 0) { 3883 // C99 6.9p2: The storage-class specifiers auto and register shall not 3884 // appear in the declaration specifiers in an external declaration. 3885 if (SC == SC_Auto || SC == SC_Register) { 3886 3887 // If this is a register variable with an asm label specified, then this 3888 // is a GNU extension. 3889 if (SC == SC_Register && D.getAsmLabel()) 3890 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3891 else 3892 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3893 D.setInvalidType(); 3894 } 3895 } 3896 3897 if (getLangOptions().OpenCL) { 3898 // Set up the special work-group-local storage class for variables in the 3899 // OpenCL __local address space. 3900 if (R.getAddressSpace() == LangAS::opencl_local) 3901 SC = SC_OpenCLWorkGroupLocal; 3902 } 3903 3904 bool isExplicitSpecialization = false; 3905 VarDecl *NewVD; 3906 if (!getLangOptions().CPlusPlus) { 3907 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3908 D.getIdentifierLoc(), II, 3909 R, TInfo, SC, SCAsWritten); 3910 3911 if (D.isInvalidType()) 3912 NewVD->setInvalidDecl(); 3913 } else { 3914 if (DC->isRecord() && !CurContext->isRecord()) { 3915 // This is an out-of-line definition of a static data member. 3916 if (SC == SC_Static) { 3917 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3918 diag::err_static_out_of_line) 3919 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3920 } else if (SC == SC_None) 3921 SC = SC_Static; 3922 } 3923 if (SC == SC_Static) { 3924 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3925 if (RD->isLocalClass()) 3926 Diag(D.getIdentifierLoc(), 3927 diag::err_static_data_member_not_allowed_in_local_class) 3928 << Name << RD->getDeclName(); 3929 3930 // C++ [class.union]p1: If a union contains a static data member, 3931 // the program is ill-formed. 3932 // 3933 // We also disallow static data members in anonymous structs. 3934 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3935 Diag(D.getIdentifierLoc(), 3936 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3937 << Name << RD->isUnion(); 3938 } 3939 } 3940 3941 // Match up the template parameter lists with the scope specifier, then 3942 // determine whether we have a template or a template specialization. 3943 isExplicitSpecialization = false; 3944 bool Invalid = false; 3945 if (TemplateParameterList *TemplateParams 3946 = MatchTemplateParametersToScopeSpecifier( 3947 D.getDeclSpec().getSourceRange().getBegin(), 3948 D.getIdentifierLoc(), 3949 D.getCXXScopeSpec(), 3950 TemplateParamLists.get(), 3951 TemplateParamLists.size(), 3952 /*never a friend*/ false, 3953 isExplicitSpecialization, 3954 Invalid)) { 3955 if (TemplateParams->size() > 0) { 3956 // There is no such thing as a variable template. 3957 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3958 << II 3959 << SourceRange(TemplateParams->getTemplateLoc(), 3960 TemplateParams->getRAngleLoc()); 3961 return 0; 3962 } else { 3963 // There is an extraneous 'template<>' for this variable. Complain 3964 // about it, but allow the declaration of the variable. 3965 Diag(TemplateParams->getTemplateLoc(), 3966 diag::err_template_variable_noparams) 3967 << II 3968 << SourceRange(TemplateParams->getTemplateLoc(), 3969 TemplateParams->getRAngleLoc()); 3970 } 3971 } 3972 3973 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3974 D.getIdentifierLoc(), II, 3975 R, TInfo, SC, SCAsWritten); 3976 3977 // If this decl has an auto type in need of deduction, make a note of the 3978 // Decl so we can diagnose uses of it in its own initializer. 3979 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3980 R->getContainedAutoType()) 3981 ParsingInitForAutoVars.insert(NewVD); 3982 3983 if (D.isInvalidType() || Invalid) 3984 NewVD->setInvalidDecl(); 3985 3986 SetNestedNameSpecifier(NewVD, D); 3987 3988 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3989 NewVD->setTemplateParameterListsInfo(Context, 3990 TemplateParamLists.size(), 3991 TemplateParamLists.release()); 3992 } 3993 3994 if (D.getDeclSpec().isConstexprSpecified()) 3995 NewVD->setConstexpr(true); 3996 } 3997 3998 // Set the lexical context. If the declarator has a C++ scope specifier, the 3999 // lexical context will be different from the semantic context. 4000 NewVD->setLexicalDeclContext(CurContext); 4001 4002 if (D.getDeclSpec().isThreadSpecified()) { 4003 if (NewVD->hasLocalStorage()) 4004 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 4005 else if (!Context.getTargetInfo().isTLSSupported()) 4006 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 4007 else 4008 NewVD->setThreadSpecified(true); 4009 } 4010 4011 if (D.getDeclSpec().isModulePrivateSpecified()) { 4012 if (isExplicitSpecialization) 4013 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 4014 << 2 4015 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4016 else if (NewVD->hasLocalStorage()) 4017 Diag(NewVD->getLocation(), diag::err_module_private_local) 4018 << 0 << NewVD->getDeclName() 4019 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 4020 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 4021 else 4022 NewVD->setModulePrivate(); 4023 } 4024 4025 // Handle attributes prior to checking for duplicates in MergeVarDecl 4026 ProcessDeclAttributes(S, NewVD, D); 4027 4028 // In auto-retain/release, infer strong retension for variables of 4029 // retainable type. 4030 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 4031 NewVD->setInvalidDecl(); 4032 4033 // Handle GNU asm-label extension (encoded as an attribute). 4034 if (Expr *E = (Expr*)D.getAsmLabel()) { 4035 // The parser guarantees this is a string. 4036 StringLiteral *SE = cast<StringLiteral>(E); 4037 StringRef Label = SE->getString(); 4038 if (S->getFnParent() != 0) { 4039 switch (SC) { 4040 case SC_None: 4041 case SC_Auto: 4042 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4043 break; 4044 case SC_Register: 4045 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4046 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4047 break; 4048 case SC_Static: 4049 case SC_Extern: 4050 case SC_PrivateExtern: 4051 case SC_OpenCLWorkGroupLocal: 4052 break; 4053 } 4054 } 4055 4056 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4057 Context, Label)); 4058 } 4059 4060 // Diagnose shadowed variables before filtering for scope. 4061 if (!D.getCXXScopeSpec().isSet()) 4062 CheckShadow(S, NewVD, Previous); 4063 4064 // Don't consider existing declarations that are in a different 4065 // scope and are out-of-semantic-context declarations (if the new 4066 // declaration has linkage). 4067 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4068 isExplicitSpecialization); 4069 4070 if (!getLangOptions().CPlusPlus) { 4071 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4072 } else { 4073 // Merge the decl with the existing one if appropriate. 4074 if (!Previous.empty()) { 4075 if (Previous.isSingleResult() && 4076 isa<FieldDecl>(Previous.getFoundDecl()) && 4077 D.getCXXScopeSpec().isSet()) { 4078 // The user tried to define a non-static data member 4079 // out-of-line (C++ [dcl.meaning]p1). 4080 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4081 << D.getCXXScopeSpec().getRange(); 4082 Previous.clear(); 4083 NewVD->setInvalidDecl(); 4084 } 4085 } else if (D.getCXXScopeSpec().isSet()) { 4086 // No previous declaration in the qualifying scope. 4087 Diag(D.getIdentifierLoc(), diag::err_no_member) 4088 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4089 << D.getCXXScopeSpec().getRange(); 4090 NewVD->setInvalidDecl(); 4091 } 4092 4093 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4094 4095 // This is an explicit specialization of a static data member. Check it. 4096 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4097 CheckMemberSpecialization(NewVD, Previous)) 4098 NewVD->setInvalidDecl(); 4099 } 4100 4101 // attributes declared post-definition are currently ignored 4102 // FIXME: This should be handled in attribute merging, not 4103 // here. 4104 if (Previous.isSingleResult()) { 4105 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4106 if (Def && (Def = Def->getDefinition()) && 4107 Def != NewVD && D.hasAttributes()) { 4108 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4109 Diag(Def->getLocation(), diag::note_previous_definition); 4110 } 4111 } 4112 4113 // If this is a locally-scoped extern C variable, update the map of 4114 // such variables. 4115 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4116 !NewVD->isInvalidDecl()) 4117 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4118 4119 // If there's a #pragma GCC visibility in scope, and this isn't a class 4120 // member, set the visibility of this variable. 4121 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4122 AddPushedVisibilityAttribute(NewVD); 4123 4124 MarkUnusedFileScopedDecl(NewVD); 4125 4126 return NewVD; 4127} 4128 4129/// \brief Diagnose variable or built-in function shadowing. Implements 4130/// -Wshadow. 4131/// 4132/// This method is called whenever a VarDecl is added to a "useful" 4133/// scope. 4134/// 4135/// \param S the scope in which the shadowing name is being declared 4136/// \param R the lookup of the name 4137/// 4138void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4139 // Return if warning is ignored. 4140 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4141 DiagnosticsEngine::Ignored) 4142 return; 4143 4144 // Don't diagnose declarations at file scope. 4145 if (D->hasGlobalStorage()) 4146 return; 4147 4148 DeclContext *NewDC = D->getDeclContext(); 4149 4150 // Only diagnose if we're shadowing an unambiguous field or variable. 4151 if (R.getResultKind() != LookupResult::Found) 4152 return; 4153 4154 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4155 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4156 return; 4157 4158 // Fields are not shadowed by variables in C++ static methods. 4159 if (isa<FieldDecl>(ShadowedDecl)) 4160 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4161 if (MD->isStatic()) 4162 return; 4163 4164 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4165 if (shadowedVar->isExternC()) { 4166 // For shadowing external vars, make sure that we point to the global 4167 // declaration, not a locally scoped extern declaration. 4168 for (VarDecl::redecl_iterator 4169 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4170 I != E; ++I) 4171 if (I->isFileVarDecl()) { 4172 ShadowedDecl = *I; 4173 break; 4174 } 4175 } 4176 4177 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4178 4179 // Only warn about certain kinds of shadowing for class members. 4180 if (NewDC && NewDC->isRecord()) { 4181 // In particular, don't warn about shadowing non-class members. 4182 if (!OldDC->isRecord()) 4183 return; 4184 4185 // TODO: should we warn about static data members shadowing 4186 // static data members from base classes? 4187 4188 // TODO: don't diagnose for inaccessible shadowed members. 4189 // This is hard to do perfectly because we might friend the 4190 // shadowing context, but that's just a false negative. 4191 } 4192 4193 // Determine what kind of declaration we're shadowing. 4194 unsigned Kind; 4195 if (isa<RecordDecl>(OldDC)) { 4196 if (isa<FieldDecl>(ShadowedDecl)) 4197 Kind = 3; // field 4198 else 4199 Kind = 2; // static data member 4200 } else if (OldDC->isFileContext()) 4201 Kind = 1; // global 4202 else 4203 Kind = 0; // local 4204 4205 DeclarationName Name = R.getLookupName(); 4206 4207 // Emit warning and note. 4208 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4209 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4210} 4211 4212/// \brief Check -Wshadow without the advantage of a previous lookup. 4213void Sema::CheckShadow(Scope *S, VarDecl *D) { 4214 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4215 DiagnosticsEngine::Ignored) 4216 return; 4217 4218 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4219 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4220 LookupName(R, S); 4221 CheckShadow(S, D, R); 4222} 4223 4224/// \brief Perform semantic checking on a newly-created variable 4225/// declaration. 4226/// 4227/// This routine performs all of the type-checking required for a 4228/// variable declaration once it has been built. It is used both to 4229/// check variables after they have been parsed and their declarators 4230/// have been translated into a declaration, and to check variables 4231/// that have been instantiated from a template. 4232/// 4233/// Sets NewVD->isInvalidDecl() if an error was encountered. 4234/// 4235/// Returns true if the variable declaration is a redeclaration. 4236bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4237 LookupResult &Previous) { 4238 // If the decl is already known invalid, don't check it. 4239 if (NewVD->isInvalidDecl()) 4240 return false; 4241 4242 QualType T = NewVD->getType(); 4243 4244 if (T->isObjCObjectType()) { 4245 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4246 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4247 T = Context.getObjCObjectPointerType(T); 4248 NewVD->setType(T); 4249 } 4250 4251 // Emit an error if an address space was applied to decl with local storage. 4252 // This includes arrays of objects with address space qualifiers, but not 4253 // automatic variables that point to other address spaces. 4254 // ISO/IEC TR 18037 S5.1.2 4255 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4256 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4257 NewVD->setInvalidDecl(); 4258 return false; 4259 } 4260 4261 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4262 && !NewVD->hasAttr<BlocksAttr>()) { 4263 if (getLangOptions().getGC() != LangOptions::NonGC) 4264 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4265 else 4266 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4267 } 4268 4269 bool isVM = T->isVariablyModifiedType(); 4270 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4271 NewVD->hasAttr<BlocksAttr>()) 4272 getCurFunction()->setHasBranchProtectedScope(); 4273 4274 if ((isVM && NewVD->hasLinkage()) || 4275 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4276 bool SizeIsNegative; 4277 llvm::APSInt Oversized; 4278 QualType FixedTy = 4279 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4280 Oversized); 4281 4282 if (FixedTy.isNull() && T->isVariableArrayType()) { 4283 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4284 // FIXME: This won't give the correct result for 4285 // int a[10][n]; 4286 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4287 4288 if (NewVD->isFileVarDecl()) 4289 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4290 << SizeRange; 4291 else if (NewVD->getStorageClass() == SC_Static) 4292 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4293 << SizeRange; 4294 else 4295 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4296 << SizeRange; 4297 NewVD->setInvalidDecl(); 4298 return false; 4299 } 4300 4301 if (FixedTy.isNull()) { 4302 if (NewVD->isFileVarDecl()) 4303 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4304 else 4305 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4306 NewVD->setInvalidDecl(); 4307 return false; 4308 } 4309 4310 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4311 NewVD->setType(FixedTy); 4312 } 4313 4314 if (Previous.empty() && NewVD->isExternC()) { 4315 // Since we did not find anything by this name and we're declaring 4316 // an extern "C" variable, look for a non-visible extern "C" 4317 // declaration with the same name. 4318 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4319 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4320 if (Pos != LocallyScopedExternalDecls.end()) 4321 Previous.addDecl(Pos->second); 4322 } 4323 4324 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4325 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4326 << T; 4327 NewVD->setInvalidDecl(); 4328 return false; 4329 } 4330 4331 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4332 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4333 NewVD->setInvalidDecl(); 4334 return false; 4335 } 4336 4337 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4338 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4339 NewVD->setInvalidDecl(); 4340 return false; 4341 } 4342 4343 // Function pointers and references cannot have qualified function type, only 4344 // function pointer-to-members can do that. 4345 QualType Pointee; 4346 unsigned PtrOrRef = 0; 4347 if (const PointerType *Ptr = T->getAs<PointerType>()) 4348 Pointee = Ptr->getPointeeType(); 4349 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4350 Pointee = Ref->getPointeeType(); 4351 PtrOrRef = 1; 4352 } 4353 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4354 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4355 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4356 << PtrOrRef; 4357 NewVD->setInvalidDecl(); 4358 return false; 4359 } 4360 4361 if (!Previous.empty()) { 4362 MergeVarDecl(NewVD, Previous); 4363 return true; 4364 } 4365 return false; 4366} 4367 4368/// \brief Data used with FindOverriddenMethod 4369struct FindOverriddenMethodData { 4370 Sema *S; 4371 CXXMethodDecl *Method; 4372}; 4373 4374/// \brief Member lookup function that determines whether a given C++ 4375/// method overrides a method in a base class, to be used with 4376/// CXXRecordDecl::lookupInBases(). 4377static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4378 CXXBasePath &Path, 4379 void *UserData) { 4380 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4381 4382 FindOverriddenMethodData *Data 4383 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4384 4385 DeclarationName Name = Data->Method->getDeclName(); 4386 4387 // FIXME: Do we care about other names here too? 4388 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4389 // We really want to find the base class destructor here. 4390 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4391 CanQualType CT = Data->S->Context.getCanonicalType(T); 4392 4393 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4394 } 4395 4396 for (Path.Decls = BaseRecord->lookup(Name); 4397 Path.Decls.first != Path.Decls.second; 4398 ++Path.Decls.first) { 4399 NamedDecl *D = *Path.Decls.first; 4400 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4401 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4402 return true; 4403 } 4404 } 4405 4406 return false; 4407} 4408 4409/// AddOverriddenMethods - See if a method overrides any in the base classes, 4410/// and if so, check that it's a valid override and remember it. 4411bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4412 // Look for virtual methods in base classes that this method might override. 4413 CXXBasePaths Paths; 4414 FindOverriddenMethodData Data; 4415 Data.Method = MD; 4416 Data.S = this; 4417 bool AddedAny = false; 4418 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4419 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4420 E = Paths.found_decls_end(); I != E; ++I) { 4421 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4422 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4423 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4424 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4425 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4426 AddedAny = true; 4427 } 4428 } 4429 } 4430 } 4431 4432 return AddedAny; 4433} 4434 4435namespace { 4436 // Struct for holding all of the extra arguments needed by 4437 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4438 struct ActOnFDArgs { 4439 Scope *S; 4440 Declarator &D; 4441 MultiTemplateParamsArg TemplateParamLists; 4442 bool AddToScope; 4443 }; 4444} 4445 4446namespace { 4447 4448// Callback to only accept typo corrections that have a non-zero edit distance. 4449class DifferentNameValidatorCCC : public CorrectionCandidateCallback { 4450 public: 4451 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 4452 return candidate.getEditDistance() > 0; 4453 } 4454}; 4455 4456} 4457 4458/// \brief Generate diagnostics for an invalid function redeclaration. 4459/// 4460/// This routine handles generating the diagnostic messages for an invalid 4461/// function redeclaration, including finding possible similar declarations 4462/// or performing typo correction if there are no previous declarations with 4463/// the same name. 4464/// 4465/// Returns a NamedDecl iff typo correction was performed and substituting in 4466/// the new declaration name does not cause new errors. 4467static NamedDecl* DiagnoseInvalidRedeclaration( 4468 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4469 ActOnFDArgs &ExtraArgs) { 4470 NamedDecl *Result = NULL; 4471 DeclarationName Name = NewFD->getDeclName(); 4472 DeclContext *NewDC = NewFD->getDeclContext(); 4473 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4474 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4475 llvm::SmallVector<unsigned, 1> MismatchedParams; 4476 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4477 TypoCorrection Correction; 4478 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4479 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4480 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4481 : diag::err_member_def_does_not_match; 4482 4483 NewFD->setInvalidDecl(); 4484 SemaRef.LookupQualifiedName(Prev, NewDC); 4485 assert(!Prev.isAmbiguous() && 4486 "Cannot have an ambiguity in previous-declaration lookup"); 4487 DifferentNameValidatorCCC Validator; 4488 if (!Prev.empty()) { 4489 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4490 Func != FuncEnd; ++Func) { 4491 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4492 if (FD && 4493 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4494 // Add 1 to the index so that 0 can mean the mismatch didn't 4495 // involve a parameter 4496 unsigned ParamNum = 4497 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4498 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4499 } 4500 } 4501 // If the qualified name lookup yielded nothing, try typo correction 4502 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4503 Prev.getLookupKind(), 0, 0, 4504 Validator, NewDC))) { 4505 // Trap errors. 4506 Sema::SFINAETrap Trap(SemaRef); 4507 4508 // Set up everything for the call to ActOnFunctionDeclarator 4509 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4510 ExtraArgs.D.getIdentifierLoc()); 4511 Previous.clear(); 4512 Previous.setLookupName(Correction.getCorrection()); 4513 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4514 CDeclEnd = Correction.end(); 4515 CDecl != CDeclEnd; ++CDecl) { 4516 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4517 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4518 MismatchedParams)) { 4519 Previous.addDecl(FD); 4520 } 4521 } 4522 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4523 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4524 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4525 // eliminate the need for the parameter pack ExtraArgs. 4526 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4527 NewFD->getDeclContext(), 4528 NewFD->getTypeSourceInfo(), 4529 Previous, 4530 ExtraArgs.TemplateParamLists, 4531 ExtraArgs.AddToScope); 4532 if (Trap.hasErrorOccurred()) { 4533 // Pretend the typo correction never occurred 4534 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4535 ExtraArgs.D.getIdentifierLoc()); 4536 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4537 Previous.clear(); 4538 Previous.setLookupName(Name); 4539 Result = NULL; 4540 } else { 4541 for (LookupResult::iterator Func = Previous.begin(), 4542 FuncEnd = Previous.end(); 4543 Func != FuncEnd; ++Func) { 4544 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4545 NearMatches.push_back(std::make_pair(FD, 0)); 4546 } 4547 } 4548 if (NearMatches.empty()) { 4549 // Ignore the correction if it didn't yield any close FunctionDecl matches 4550 Correction = TypoCorrection(); 4551 } else { 4552 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4553 : diag::err_member_def_does_not_match_suggest; 4554 } 4555 } 4556 4557 if (Correction) 4558 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4559 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4560 << FixItHint::CreateReplacement( 4561 NewFD->getLocation(), 4562 Correction.getAsString(SemaRef.getLangOptions())); 4563 else 4564 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4565 << Name << NewDC << NewFD->getLocation(); 4566 4567 bool NewFDisConst = false; 4568 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4569 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4570 4571 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4572 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4573 NearMatch != NearMatchEnd; ++NearMatch) { 4574 FunctionDecl *FD = NearMatch->first; 4575 bool FDisConst = false; 4576 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4577 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4578 4579 if (unsigned Idx = NearMatch->second) { 4580 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4581 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4582 diag::note_member_def_close_param_match) 4583 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4584 } else if (Correction) { 4585 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4586 << Correction.getQuoted(SemaRef.getLangOptions()); 4587 } else if (FDisConst != NewFDisConst) { 4588 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4589 << NewFDisConst << FD->getSourceRange().getEnd(); 4590 } else 4591 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4592 } 4593 return Result; 4594} 4595 4596static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4597 Declarator &D) { 4598 switch (D.getDeclSpec().getStorageClassSpec()) { 4599 default: llvm_unreachable("Unknown storage class!"); 4600 case DeclSpec::SCS_auto: 4601 case DeclSpec::SCS_register: 4602 case DeclSpec::SCS_mutable: 4603 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4604 diag::err_typecheck_sclass_func); 4605 D.setInvalidType(); 4606 break; 4607 case DeclSpec::SCS_unspecified: break; 4608 case DeclSpec::SCS_extern: return SC_Extern; 4609 case DeclSpec::SCS_static: { 4610 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4611 // C99 6.7.1p5: 4612 // The declaration of an identifier for a function that has 4613 // block scope shall have no explicit storage-class specifier 4614 // other than extern 4615 // See also (C++ [dcl.stc]p4). 4616 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4617 diag::err_static_block_func); 4618 break; 4619 } else 4620 return SC_Static; 4621 } 4622 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4623 } 4624 4625 // No explicit storage class has already been returned 4626 return SC_None; 4627} 4628 4629static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4630 DeclContext *DC, QualType &R, 4631 TypeSourceInfo *TInfo, 4632 FunctionDecl::StorageClass SC, 4633 bool &IsVirtualOkay) { 4634 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4635 DeclarationName Name = NameInfo.getName(); 4636 4637 FunctionDecl *NewFD = 0; 4638 bool isInline = D.getDeclSpec().isInlineSpecified(); 4639 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4640 FunctionDecl::StorageClass SCAsWritten 4641 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4642 4643 if (!SemaRef.getLangOptions().CPlusPlus) { 4644 // Determine whether the function was written with a 4645 // prototype. This true when: 4646 // - there is a prototype in the declarator, or 4647 // - the type R of the function is some kind of typedef or other reference 4648 // to a type name (which eventually refers to a function type). 4649 bool HasPrototype = 4650 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4651 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4652 4653 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4654 D.getSourceRange().getBegin(), NameInfo, R, 4655 TInfo, SC, SCAsWritten, isInline, 4656 HasPrototype); 4657 if (D.isInvalidType()) 4658 NewFD->setInvalidDecl(); 4659 4660 // Set the lexical context. 4661 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4662 4663 return NewFD; 4664 } 4665 4666 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4667 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4668 4669 // Check that the return type is not an abstract class type. 4670 // For record types, this is done by the AbstractClassUsageDiagnoser once 4671 // the class has been completely parsed. 4672 if (!DC->isRecord() && 4673 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4674 R->getAs<FunctionType>()->getResultType(), 4675 diag::err_abstract_type_in_decl, 4676 SemaRef.AbstractReturnType)) 4677 D.setInvalidType(); 4678 4679 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4680 // This is a C++ constructor declaration. 4681 assert(DC->isRecord() && 4682 "Constructors can only be declared in a member context"); 4683 4684 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4685 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4686 D.getSourceRange().getBegin(), NameInfo, 4687 R, TInfo, isExplicit, isInline, 4688 /*isImplicitlyDeclared=*/false, 4689 isConstexpr); 4690 4691 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4692 // This is a C++ destructor declaration. 4693 if (DC->isRecord()) { 4694 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4695 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4696 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4697 SemaRef.Context, Record, 4698 D.getSourceRange().getBegin(), 4699 NameInfo, R, TInfo, isInline, 4700 /*isImplicitlyDeclared=*/false); 4701 4702 // If the class is complete, then we now create the implicit exception 4703 // specification. If the class is incomplete or dependent, we can't do 4704 // it yet. 4705 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4706 Record->getDefinition() && !Record->isBeingDefined() && 4707 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4708 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4709 } 4710 4711 IsVirtualOkay = true; 4712 return NewDD; 4713 4714 } else { 4715 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4716 D.setInvalidType(); 4717 4718 // Create a FunctionDecl to satisfy the function definition parsing 4719 // code path. 4720 return FunctionDecl::Create(SemaRef.Context, DC, 4721 D.getSourceRange().getBegin(), 4722 D.getIdentifierLoc(), Name, R, TInfo, 4723 SC, SCAsWritten, isInline, 4724 /*hasPrototype=*/true, isConstexpr); 4725 } 4726 4727 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4728 if (!DC->isRecord()) { 4729 SemaRef.Diag(D.getIdentifierLoc(), 4730 diag::err_conv_function_not_member); 4731 return 0; 4732 } 4733 4734 SemaRef.CheckConversionDeclarator(D, R, SC); 4735 IsVirtualOkay = true; 4736 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4737 D.getSourceRange().getBegin(), NameInfo, 4738 R, TInfo, isInline, isExplicit, 4739 isConstexpr, SourceLocation()); 4740 4741 } else if (DC->isRecord()) { 4742 // If the name of the function is the same as the name of the record, 4743 // then this must be an invalid constructor that has a return type. 4744 // (The parser checks for a return type and makes the declarator a 4745 // constructor if it has no return type). 4746 if (Name.getAsIdentifierInfo() && 4747 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4748 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4749 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4750 << SourceRange(D.getIdentifierLoc()); 4751 return 0; 4752 } 4753 4754 bool isStatic = SC == SC_Static; 4755 4756 // [class.free]p1: 4757 // Any allocation function for a class T is a static member 4758 // (even if not explicitly declared static). 4759 if (Name.getCXXOverloadedOperator() == OO_New || 4760 Name.getCXXOverloadedOperator() == OO_Array_New) 4761 isStatic = true; 4762 4763 // [class.free]p6 Any deallocation function for a class X is a static member 4764 // (even if not explicitly declared static). 4765 if (Name.getCXXOverloadedOperator() == OO_Delete || 4766 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4767 isStatic = true; 4768 4769 IsVirtualOkay = !isStatic; 4770 4771 // This is a C++ method declaration. 4772 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4773 D.getSourceRange().getBegin(), NameInfo, R, 4774 TInfo, isStatic, SCAsWritten, isInline, 4775 isConstexpr, SourceLocation()); 4776 4777 } else { 4778 // Determine whether the function was written with a 4779 // prototype. This true when: 4780 // - we're in C++ (where every function has a prototype), 4781 return FunctionDecl::Create(SemaRef.Context, DC, 4782 D.getSourceRange().getBegin(), 4783 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4784 true/*HasPrototype*/, isConstexpr); 4785 } 4786} 4787 4788NamedDecl* 4789Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4790 TypeSourceInfo *TInfo, LookupResult &Previous, 4791 MultiTemplateParamsArg TemplateParamLists, 4792 bool &AddToScope) { 4793 QualType R = TInfo->getType(); 4794 4795 assert(R.getTypePtr()->isFunctionType()); 4796 4797 // TODO: consider using NameInfo for diagnostic. 4798 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4799 DeclarationName Name = NameInfo.getName(); 4800 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4801 4802 if (D.getDeclSpec().isThreadSpecified()) 4803 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4804 4805 // Do not allow returning a objc interface by-value. 4806 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4807 Diag(D.getIdentifierLoc(), 4808 diag::err_object_cannot_be_passed_returned_by_value) << 0 4809 << R->getAs<FunctionType>()->getResultType() 4810 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4811 4812 QualType T = R->getAs<FunctionType>()->getResultType(); 4813 T = Context.getObjCObjectPointerType(T); 4814 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4815 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4816 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4817 FPT->getNumArgs(), EPI); 4818 } 4819 else if (isa<FunctionNoProtoType>(R)) 4820 R = Context.getFunctionNoProtoType(T); 4821 } 4822 4823 bool isFriend = false; 4824 FunctionTemplateDecl *FunctionTemplate = 0; 4825 bool isExplicitSpecialization = false; 4826 bool isFunctionTemplateSpecialization = false; 4827 bool isDependentClassScopeExplicitSpecialization = false; 4828 bool isVirtualOkay = false; 4829 4830 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4831 isVirtualOkay); 4832 if (!NewFD) return 0; 4833 4834 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4835 NewFD->setTopLevelDeclInObjCContainer(); 4836 4837 if (getLangOptions().CPlusPlus) { 4838 bool isInline = D.getDeclSpec().isInlineSpecified(); 4839 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4840 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4841 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4842 isFriend = D.getDeclSpec().isFriendSpecified(); 4843 if (isFriend && !isInline && D.isFunctionDefinition()) { 4844 // C++ [class.friend]p5 4845 // A function can be defined in a friend declaration of a 4846 // class . . . . Such a function is implicitly inline. 4847 NewFD->setImplicitlyInline(); 4848 } 4849 4850 SetNestedNameSpecifier(NewFD, D); 4851 isExplicitSpecialization = false; 4852 isFunctionTemplateSpecialization = false; 4853 if (D.isInvalidType()) 4854 NewFD->setInvalidDecl(); 4855 4856 // Set the lexical context. If the declarator has a C++ 4857 // scope specifier, or is the object of a friend declaration, the 4858 // lexical context will be different from the semantic context. 4859 NewFD->setLexicalDeclContext(CurContext); 4860 4861 // Match up the template parameter lists with the scope specifier, then 4862 // determine whether we have a template or a template specialization. 4863 bool Invalid = false; 4864 if (TemplateParameterList *TemplateParams 4865 = MatchTemplateParametersToScopeSpecifier( 4866 D.getDeclSpec().getSourceRange().getBegin(), 4867 D.getIdentifierLoc(), 4868 D.getCXXScopeSpec(), 4869 TemplateParamLists.get(), 4870 TemplateParamLists.size(), 4871 isFriend, 4872 isExplicitSpecialization, 4873 Invalid)) { 4874 if (TemplateParams->size() > 0) { 4875 // This is a function template 4876 4877 // Check that we can declare a template here. 4878 if (CheckTemplateDeclScope(S, TemplateParams)) 4879 return 0; 4880 4881 // A destructor cannot be a template. 4882 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4883 Diag(NewFD->getLocation(), diag::err_destructor_template); 4884 return 0; 4885 } 4886 4887 // If we're adding a template to a dependent context, we may need to 4888 // rebuilding some of the types used within the template parameter list, 4889 // now that we know what the current instantiation is. 4890 if (DC->isDependentContext()) { 4891 ContextRAII SavedContext(*this, DC); 4892 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4893 Invalid = true; 4894 } 4895 4896 4897 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4898 NewFD->getLocation(), 4899 Name, TemplateParams, 4900 NewFD); 4901 FunctionTemplate->setLexicalDeclContext(CurContext); 4902 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4903 4904 // For source fidelity, store the other template param lists. 4905 if (TemplateParamLists.size() > 1) { 4906 NewFD->setTemplateParameterListsInfo(Context, 4907 TemplateParamLists.size() - 1, 4908 TemplateParamLists.release()); 4909 } 4910 } else { 4911 // This is a function template specialization. 4912 isFunctionTemplateSpecialization = true; 4913 // For source fidelity, store all the template param lists. 4914 NewFD->setTemplateParameterListsInfo(Context, 4915 TemplateParamLists.size(), 4916 TemplateParamLists.release()); 4917 4918 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4919 if (isFriend) { 4920 // We want to remove the "template<>", found here. 4921 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4922 4923 // If we remove the template<> and the name is not a 4924 // template-id, we're actually silently creating a problem: 4925 // the friend declaration will refer to an untemplated decl, 4926 // and clearly the user wants a template specialization. So 4927 // we need to insert '<>' after the name. 4928 SourceLocation InsertLoc; 4929 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4930 InsertLoc = D.getName().getSourceRange().getEnd(); 4931 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4932 } 4933 4934 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4935 << Name << RemoveRange 4936 << FixItHint::CreateRemoval(RemoveRange) 4937 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4938 } 4939 } 4940 } 4941 else { 4942 // All template param lists were matched against the scope specifier: 4943 // this is NOT (an explicit specialization of) a template. 4944 if (TemplateParamLists.size() > 0) 4945 // For source fidelity, store all the template param lists. 4946 NewFD->setTemplateParameterListsInfo(Context, 4947 TemplateParamLists.size(), 4948 TemplateParamLists.release()); 4949 } 4950 4951 if (Invalid) { 4952 NewFD->setInvalidDecl(); 4953 if (FunctionTemplate) 4954 FunctionTemplate->setInvalidDecl(); 4955 } 4956 4957 // If we see "T var();" at block scope, where T is a class type, it is 4958 // probably an attempt to initialize a variable, not a function declaration. 4959 // We don't catch this case earlier, since there is no ambiguity here. 4960 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4961 CurContext->isFunctionOrMethod() && 4962 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4963 D.getDeclSpec().getStorageClassSpecAsWritten() 4964 == DeclSpec::SCS_unspecified) { 4965 QualType T = R->getAs<FunctionType>()->getResultType(); 4966 DeclaratorChunk &C = D.getTypeObject(0); 4967 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4968 !C.Fun.TrailingReturnType && 4969 C.Fun.getExceptionSpecType() == EST_None) { 4970 SourceRange ParenRange(C.Loc, C.EndLoc); 4971 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 4972 4973 // If the declaration looks like: 4974 // T var1, 4975 // f(); 4976 // and name lookup finds a function named 'f', then the ',' was 4977 // probably intended to be a ';'. 4978 if (!D.isFirstDeclarator() && D.getIdentifier()) { 4979 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 4980 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 4981 if (Comma.getFileID() != Name.getFileID() || 4982 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 4983 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 4984 LookupOrdinaryName); 4985 if (LookupName(Result, S)) 4986 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 4987 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 4988 } 4989 } 4990 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 4991 // Empty parens mean value-initialization, and no parens mean default 4992 // initialization. These are equivalent if the default constructor is 4993 // user-provided, or if zero-initialization is a no-op. 4994 if (RD && RD->hasDefinition() && 4995 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 4996 Diag(C.Loc, diag::note_empty_parens_default_ctor) 4997 << FixItHint::CreateRemoval(ParenRange); 4998 else if (const char *Init = getFixItZeroInitializerForType(T)) 4999 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5000 << FixItHint::CreateReplacement(ParenRange, Init); 5001 else if (LangOpts.CPlusPlus0x) 5002 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 5003 << FixItHint::CreateReplacement(ParenRange, "{}"); 5004 } 5005 } 5006 5007 // C++ [dcl.fct.spec]p5: 5008 // The virtual specifier shall only be used in declarations of 5009 // nonstatic class member functions that appear within a 5010 // member-specification of a class declaration; see 10.3. 5011 // 5012 if (isVirtual && !NewFD->isInvalidDecl()) { 5013 if (!isVirtualOkay) { 5014 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5015 diag::err_virtual_non_function); 5016 } else if (!CurContext->isRecord()) { 5017 // 'virtual' was specified outside of the class. 5018 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5019 diag::err_virtual_out_of_class) 5020 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5021 } else if (NewFD->getDescribedFunctionTemplate()) { 5022 // C++ [temp.mem]p3: 5023 // A member function template shall not be virtual. 5024 Diag(D.getDeclSpec().getVirtualSpecLoc(), 5025 diag::err_virtual_member_function_template) 5026 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 5027 } else { 5028 // Okay: Add virtual to the method. 5029 NewFD->setVirtualAsWritten(true); 5030 } 5031 } 5032 5033 // C++ [dcl.fct.spec]p3: 5034 // The inline specifier shall not appear on a block scope function 5035 // declaration. 5036 if (isInline && !NewFD->isInvalidDecl()) { 5037 if (CurContext->isFunctionOrMethod()) { 5038 // 'inline' is not allowed on block scope function declaration. 5039 Diag(D.getDeclSpec().getInlineSpecLoc(), 5040 diag::err_inline_declaration_block_scope) << Name 5041 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 5042 } 5043 } 5044 5045 // C++ [dcl.fct.spec]p6: 5046 // The explicit specifier shall be used only in the declaration of a 5047 // constructor or conversion function within its class definition; 5048 // see 12.3.1 and 12.3.2. 5049 if (isExplicit && !NewFD->isInvalidDecl()) { 5050 if (!CurContext->isRecord()) { 5051 // 'explicit' was specified outside of the class. 5052 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5053 diag::err_explicit_out_of_class) 5054 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5055 } else if (!isa<CXXConstructorDecl>(NewFD) && 5056 !isa<CXXConversionDecl>(NewFD)) { 5057 // 'explicit' was specified on a function that wasn't a constructor 5058 // or conversion function. 5059 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5060 diag::err_explicit_non_ctor_or_conv_function) 5061 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5062 } 5063 } 5064 5065 if (isConstexpr) { 5066 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5067 // are implicitly inline. 5068 NewFD->setImplicitlyInline(); 5069 5070 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5071 // be either constructors or to return a literal type. Therefore, 5072 // destructors cannot be declared constexpr. 5073 if (isa<CXXDestructorDecl>(NewFD)) 5074 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5075 } 5076 5077 // If __module_private__ was specified, mark the function accordingly. 5078 if (D.getDeclSpec().isModulePrivateSpecified()) { 5079 if (isFunctionTemplateSpecialization) { 5080 SourceLocation ModulePrivateLoc 5081 = D.getDeclSpec().getModulePrivateSpecLoc(); 5082 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5083 << 0 5084 << FixItHint::CreateRemoval(ModulePrivateLoc); 5085 } else { 5086 NewFD->setModulePrivate(); 5087 if (FunctionTemplate) 5088 FunctionTemplate->setModulePrivate(); 5089 } 5090 } 5091 5092 if (isFriend) { 5093 // For now, claim that the objects have no previous declaration. 5094 if (FunctionTemplate) { 5095 FunctionTemplate->setObjectOfFriendDecl(false); 5096 FunctionTemplate->setAccess(AS_public); 5097 } 5098 NewFD->setObjectOfFriendDecl(false); 5099 NewFD->setAccess(AS_public); 5100 } 5101 5102 // If a function is defined as defaulted or deleted, mark it as such now. 5103 switch (D.getFunctionDefinitionKind()) { 5104 case FDK_Declaration: 5105 case FDK_Definition: 5106 break; 5107 5108 case FDK_Defaulted: 5109 NewFD->setDefaulted(); 5110 break; 5111 5112 case FDK_Deleted: 5113 NewFD->setDeletedAsWritten(); 5114 break; 5115 } 5116 5117 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5118 D.isFunctionDefinition()) { 5119 // C++ [class.mfct]p2: 5120 // A member function may be defined (8.4) in its class definition, in 5121 // which case it is an inline member function (7.1.2) 5122 NewFD->setImplicitlyInline(); 5123 } 5124 5125 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5126 !CurContext->isRecord()) { 5127 // C++ [class.static]p1: 5128 // A data or function member of a class may be declared static 5129 // in a class definition, in which case it is a static member of 5130 // the class. 5131 5132 // Complain about the 'static' specifier if it's on an out-of-line 5133 // member function definition. 5134 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5135 diag::err_static_out_of_line) 5136 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5137 } 5138 } 5139 5140 // Filter out previous declarations that don't match the scope. 5141 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5142 isExplicitSpecialization || 5143 isFunctionTemplateSpecialization); 5144 5145 // Handle GNU asm-label extension (encoded as an attribute). 5146 if (Expr *E = (Expr*) D.getAsmLabel()) { 5147 // The parser guarantees this is a string. 5148 StringLiteral *SE = cast<StringLiteral>(E); 5149 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5150 SE->getString())); 5151 } 5152 5153 // Copy the parameter declarations from the declarator D to the function 5154 // declaration NewFD, if they are available. First scavenge them into Params. 5155 SmallVector<ParmVarDecl*, 16> Params; 5156 if (D.isFunctionDeclarator()) { 5157 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5158 5159 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5160 // function that takes no arguments, not a function that takes a 5161 // single void argument. 5162 // We let through "const void" here because Sema::GetTypeForDeclarator 5163 // already checks for that case. 5164 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5165 FTI.ArgInfo[0].Param && 5166 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5167 // Empty arg list, don't push any params. 5168 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5169 5170 // In C++, the empty parameter-type-list must be spelled "void"; a 5171 // typedef of void is not permitted. 5172 if (getLangOptions().CPlusPlus && 5173 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5174 bool IsTypeAlias = false; 5175 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5176 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5177 else if (const TemplateSpecializationType *TST = 5178 Param->getType()->getAs<TemplateSpecializationType>()) 5179 IsTypeAlias = TST->isTypeAlias(); 5180 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5181 << IsTypeAlias; 5182 } 5183 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5184 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5185 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5186 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5187 Param->setDeclContext(NewFD); 5188 Params.push_back(Param); 5189 5190 if (Param->isInvalidDecl()) 5191 NewFD->setInvalidDecl(); 5192 } 5193 } 5194 5195 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5196 // When we're declaring a function with a typedef, typeof, etc as in the 5197 // following example, we'll need to synthesize (unnamed) 5198 // parameters for use in the declaration. 5199 // 5200 // @code 5201 // typedef void fn(int); 5202 // fn f; 5203 // @endcode 5204 5205 // Synthesize a parameter for each argument type. 5206 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5207 AE = FT->arg_type_end(); AI != AE; ++AI) { 5208 ParmVarDecl *Param = 5209 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5210 Param->setScopeInfo(0, Params.size()); 5211 Params.push_back(Param); 5212 } 5213 } else { 5214 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5215 "Should not need args for typedef of non-prototype fn"); 5216 } 5217 5218 // Finally, we know we have the right number of parameters, install them. 5219 NewFD->setParams(Params); 5220 5221 // Process the non-inheritable attributes on this declaration. 5222 ProcessDeclAttributes(S, NewFD, D, 5223 /*NonInheritable=*/true, /*Inheritable=*/false); 5224 5225 if (!getLangOptions().CPlusPlus) { 5226 // Perform semantic checking on the function declaration. 5227 bool isExplicitSpecialization=false; 5228 if (!NewFD->isInvalidDecl()) { 5229 if (NewFD->getResultType()->isVariablyModifiedType()) { 5230 // Functions returning a variably modified type violate C99 6.7.5.2p2 5231 // because all functions have linkage. 5232 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5233 NewFD->setInvalidDecl(); 5234 } else { 5235 if (NewFD->isMain()) 5236 CheckMain(NewFD, D.getDeclSpec()); 5237 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5238 isExplicitSpecialization)); 5239 } 5240 } 5241 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5242 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5243 "previous declaration set still overloaded"); 5244 } else { 5245 // If the declarator is a template-id, translate the parser's template 5246 // argument list into our AST format. 5247 bool HasExplicitTemplateArgs = false; 5248 TemplateArgumentListInfo TemplateArgs; 5249 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5250 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5251 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5252 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5253 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5254 TemplateId->getTemplateArgs(), 5255 TemplateId->NumArgs); 5256 translateTemplateArguments(TemplateArgsPtr, 5257 TemplateArgs); 5258 TemplateArgsPtr.release(); 5259 5260 HasExplicitTemplateArgs = true; 5261 5262 if (NewFD->isInvalidDecl()) { 5263 HasExplicitTemplateArgs = false; 5264 } else if (FunctionTemplate) { 5265 // Function template with explicit template arguments. 5266 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5267 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5268 5269 HasExplicitTemplateArgs = false; 5270 } else if (!isFunctionTemplateSpecialization && 5271 !D.getDeclSpec().isFriendSpecified()) { 5272 // We have encountered something that the user meant to be a 5273 // specialization (because it has explicitly-specified template 5274 // arguments) but that was not introduced with a "template<>" (or had 5275 // too few of them). 5276 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5277 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5278 << FixItHint::CreateInsertion( 5279 D.getDeclSpec().getSourceRange().getBegin(), 5280 "template<> "); 5281 isFunctionTemplateSpecialization = true; 5282 } else { 5283 // "friend void foo<>(int);" is an implicit specialization decl. 5284 isFunctionTemplateSpecialization = true; 5285 } 5286 } else if (isFriend && isFunctionTemplateSpecialization) { 5287 // This combination is only possible in a recovery case; the user 5288 // wrote something like: 5289 // template <> friend void foo(int); 5290 // which we're recovering from as if the user had written: 5291 // friend void foo<>(int); 5292 // Go ahead and fake up a template id. 5293 HasExplicitTemplateArgs = true; 5294 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5295 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5296 } 5297 5298 // If it's a friend (and only if it's a friend), it's possible 5299 // that either the specialized function type or the specialized 5300 // template is dependent, and therefore matching will fail. In 5301 // this case, don't check the specialization yet. 5302 bool InstantiationDependent = false; 5303 if (isFunctionTemplateSpecialization && isFriend && 5304 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5305 TemplateSpecializationType::anyDependentTemplateArguments( 5306 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5307 InstantiationDependent))) { 5308 assert(HasExplicitTemplateArgs && 5309 "friend function specialization without template args"); 5310 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5311 Previous)) 5312 NewFD->setInvalidDecl(); 5313 } else if (isFunctionTemplateSpecialization) { 5314 if (CurContext->isDependentContext() && CurContext->isRecord() 5315 && !isFriend) { 5316 isDependentClassScopeExplicitSpecialization = true; 5317 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5318 diag::ext_function_specialization_in_class : 5319 diag::err_function_specialization_in_class) 5320 << NewFD->getDeclName(); 5321 } else if (CheckFunctionTemplateSpecialization(NewFD, 5322 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5323 Previous)) 5324 NewFD->setInvalidDecl(); 5325 5326 // C++ [dcl.stc]p1: 5327 // A storage-class-specifier shall not be specified in an explicit 5328 // specialization (14.7.3) 5329 if (SC != SC_None) { 5330 if (SC != NewFD->getStorageClass()) 5331 Diag(NewFD->getLocation(), 5332 diag::err_explicit_specialization_inconsistent_storage_class) 5333 << SC 5334 << FixItHint::CreateRemoval( 5335 D.getDeclSpec().getStorageClassSpecLoc()); 5336 5337 else 5338 Diag(NewFD->getLocation(), 5339 diag::ext_explicit_specialization_storage_class) 5340 << FixItHint::CreateRemoval( 5341 D.getDeclSpec().getStorageClassSpecLoc()); 5342 } 5343 5344 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5345 if (CheckMemberSpecialization(NewFD, Previous)) 5346 NewFD->setInvalidDecl(); 5347 } 5348 5349 // Perform semantic checking on the function declaration. 5350 if (!isDependentClassScopeExplicitSpecialization) { 5351 if (NewFD->isInvalidDecl()) { 5352 // If this is a class member, mark the class invalid immediately. 5353 // This avoids some consistency errors later. 5354 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5355 methodDecl->getParent()->setInvalidDecl(); 5356 } else { 5357 if (NewFD->isMain()) 5358 CheckMain(NewFD, D.getDeclSpec()); 5359 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5360 isExplicitSpecialization)); 5361 } 5362 } 5363 5364 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5365 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5366 "previous declaration set still overloaded"); 5367 5368 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5369 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5370 NewFD->setInvalidDecl(); 5371 5372 NamedDecl *PrincipalDecl = (FunctionTemplate 5373 ? cast<NamedDecl>(FunctionTemplate) 5374 : NewFD); 5375 5376 if (isFriend && D.isRedeclaration()) { 5377 AccessSpecifier Access = AS_public; 5378 if (!NewFD->isInvalidDecl()) 5379 Access = NewFD->getPreviousDecl()->getAccess(); 5380 5381 NewFD->setAccess(Access); 5382 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5383 5384 PrincipalDecl->setObjectOfFriendDecl(true); 5385 } 5386 5387 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5388 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5389 PrincipalDecl->setNonMemberOperator(); 5390 5391 // If we have a function template, check the template parameter 5392 // list. This will check and merge default template arguments. 5393 if (FunctionTemplate) { 5394 FunctionTemplateDecl *PrevTemplate = 5395 FunctionTemplate->getPreviousDecl(); 5396 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5397 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5398 D.getDeclSpec().isFriendSpecified() 5399 ? (D.isFunctionDefinition() 5400 ? TPC_FriendFunctionTemplateDefinition 5401 : TPC_FriendFunctionTemplate) 5402 : (D.getCXXScopeSpec().isSet() && 5403 DC && DC->isRecord() && 5404 DC->isDependentContext()) 5405 ? TPC_ClassTemplateMember 5406 : TPC_FunctionTemplate); 5407 } 5408 5409 if (NewFD->isInvalidDecl()) { 5410 // Ignore all the rest of this. 5411 } else if (!D.isRedeclaration()) { 5412 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5413 AddToScope }; 5414 // Fake up an access specifier if it's supposed to be a class member. 5415 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5416 NewFD->setAccess(AS_public); 5417 5418 // Qualified decls generally require a previous declaration. 5419 if (D.getCXXScopeSpec().isSet()) { 5420 // ...with the major exception of templated-scope or 5421 // dependent-scope friend declarations. 5422 5423 // TODO: we currently also suppress this check in dependent 5424 // contexts because (1) the parameter depth will be off when 5425 // matching friend templates and (2) we might actually be 5426 // selecting a friend based on a dependent factor. But there 5427 // are situations where these conditions don't apply and we 5428 // can actually do this check immediately. 5429 if (isFriend && 5430 (TemplateParamLists.size() || 5431 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5432 CurContext->isDependentContext())) { 5433 // ignore these 5434 } else { 5435 // The user tried to provide an out-of-line definition for a 5436 // function that is a member of a class or namespace, but there 5437 // was no such member function declared (C++ [class.mfct]p2, 5438 // C++ [namespace.memdef]p2). For example: 5439 // 5440 // class X { 5441 // void f() const; 5442 // }; 5443 // 5444 // void X::f() { } // ill-formed 5445 // 5446 // Complain about this problem, and attempt to suggest close 5447 // matches (e.g., those that differ only in cv-qualifiers and 5448 // whether the parameter types are references). 5449 5450 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5451 NewFD, 5452 ExtraArgs)) { 5453 AddToScope = ExtraArgs.AddToScope; 5454 return Result; 5455 } 5456 } 5457 5458 // Unqualified local friend declarations are required to resolve 5459 // to something. 5460 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5461 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5462 NewFD, 5463 ExtraArgs)) { 5464 AddToScope = ExtraArgs.AddToScope; 5465 return Result; 5466 } 5467 } 5468 5469 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5470 !isFriend && !isFunctionTemplateSpecialization && 5471 !isExplicitSpecialization) { 5472 // An out-of-line member function declaration must also be a 5473 // definition (C++ [dcl.meaning]p1). 5474 // Note that this is not the case for explicit specializations of 5475 // function templates or member functions of class templates, per 5476 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5477 // extension for compatibility with old SWIG code which likes to 5478 // generate them. 5479 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5480 << D.getCXXScopeSpec().getRange(); 5481 } 5482 } 5483 5484 5485 // Handle attributes. We need to have merged decls when handling attributes 5486 // (for example to check for conflicts, etc). 5487 // FIXME: This needs to happen before we merge declarations. Then, 5488 // let attribute merging cope with attribute conflicts. 5489 ProcessDeclAttributes(S, NewFD, D, 5490 /*NonInheritable=*/false, /*Inheritable=*/true); 5491 5492 // attributes declared post-definition are currently ignored 5493 // FIXME: This should happen during attribute merging 5494 if (D.isRedeclaration() && Previous.isSingleResult()) { 5495 const FunctionDecl *Def; 5496 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5497 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5498 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5499 Diag(Def->getLocation(), diag::note_previous_definition); 5500 } 5501 } 5502 5503 AddKnownFunctionAttributes(NewFD); 5504 5505 if (NewFD->hasAttr<OverloadableAttr>() && 5506 !NewFD->getType()->getAs<FunctionProtoType>()) { 5507 Diag(NewFD->getLocation(), 5508 diag::err_attribute_overloadable_no_prototype) 5509 << NewFD; 5510 5511 // Turn this into a variadic function with no parameters. 5512 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5513 FunctionProtoType::ExtProtoInfo EPI; 5514 EPI.Variadic = true; 5515 EPI.ExtInfo = FT->getExtInfo(); 5516 5517 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5518 NewFD->setType(R); 5519 } 5520 5521 // If there's a #pragma GCC visibility in scope, and this isn't a class 5522 // member, set the visibility of this function. 5523 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5524 AddPushedVisibilityAttribute(NewFD); 5525 5526 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5527 // marking the function. 5528 AddCFAuditedAttribute(NewFD); 5529 5530 // If this is a locally-scoped extern C function, update the 5531 // map of such names. 5532 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5533 && !NewFD->isInvalidDecl()) 5534 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5535 5536 // Set this FunctionDecl's range up to the right paren. 5537 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5538 5539 if (getLangOptions().CPlusPlus) { 5540 if (FunctionTemplate) { 5541 if (NewFD->isInvalidDecl()) 5542 FunctionTemplate->setInvalidDecl(); 5543 return FunctionTemplate; 5544 } 5545 } 5546 5547 MarkUnusedFileScopedDecl(NewFD); 5548 5549 if (getLangOptions().CUDA) 5550 if (IdentifierInfo *II = NewFD->getIdentifier()) 5551 if (!NewFD->isInvalidDecl() && 5552 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5553 if (II->isStr("cudaConfigureCall")) { 5554 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5555 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5556 5557 Context.setcudaConfigureCallDecl(NewFD); 5558 } 5559 } 5560 5561 // Here we have an function template explicit specialization at class scope. 5562 // The actually specialization will be postponed to template instatiation 5563 // time via the ClassScopeFunctionSpecializationDecl node. 5564 if (isDependentClassScopeExplicitSpecialization) { 5565 ClassScopeFunctionSpecializationDecl *NewSpec = 5566 ClassScopeFunctionSpecializationDecl::Create( 5567 Context, CurContext, SourceLocation(), 5568 cast<CXXMethodDecl>(NewFD)); 5569 CurContext->addDecl(NewSpec); 5570 AddToScope = false; 5571 } 5572 5573 return NewFD; 5574} 5575 5576/// \brief Perform semantic checking of a new function declaration. 5577/// 5578/// Performs semantic analysis of the new function declaration 5579/// NewFD. This routine performs all semantic checking that does not 5580/// require the actual declarator involved in the declaration, and is 5581/// used both for the declaration of functions as they are parsed 5582/// (called via ActOnDeclarator) and for the declaration of functions 5583/// that have been instantiated via C++ template instantiation (called 5584/// via InstantiateDecl). 5585/// 5586/// \param IsExplicitSpecialiation whether this new function declaration is 5587/// an explicit specialization of the previous declaration. 5588/// 5589/// This sets NewFD->isInvalidDecl() to true if there was an error. 5590/// 5591/// Returns true if the function declaration is a redeclaration. 5592bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5593 LookupResult &Previous, 5594 bool IsExplicitSpecialization) { 5595 assert(!NewFD->getResultType()->isVariablyModifiedType() 5596 && "Variably modified return types are not handled here"); 5597 5598 // Check for a previous declaration of this name. 5599 if (Previous.empty() && NewFD->isExternC()) { 5600 // Since we did not find anything by this name and we're declaring 5601 // an extern "C" function, look for a non-visible extern "C" 5602 // declaration with the same name. 5603 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5604 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5605 if (Pos != LocallyScopedExternalDecls.end()) 5606 Previous.addDecl(Pos->second); 5607 } 5608 5609 bool Redeclaration = false; 5610 5611 // Merge or overload the declaration with an existing declaration of 5612 // the same name, if appropriate. 5613 if (!Previous.empty()) { 5614 // Determine whether NewFD is an overload of PrevDecl or 5615 // a declaration that requires merging. If it's an overload, 5616 // there's no more work to do here; we'll just add the new 5617 // function to the scope. 5618 5619 NamedDecl *OldDecl = 0; 5620 if (!AllowOverloadingOfFunction(Previous, Context)) { 5621 Redeclaration = true; 5622 OldDecl = Previous.getFoundDecl(); 5623 } else { 5624 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5625 /*NewIsUsingDecl*/ false)) { 5626 case Ovl_Match: 5627 Redeclaration = true; 5628 break; 5629 5630 case Ovl_NonFunction: 5631 Redeclaration = true; 5632 break; 5633 5634 case Ovl_Overload: 5635 Redeclaration = false; 5636 break; 5637 } 5638 5639 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5640 // If a function name is overloadable in C, then every function 5641 // with that name must be marked "overloadable". 5642 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5643 << Redeclaration << NewFD; 5644 NamedDecl *OverloadedDecl = 0; 5645 if (Redeclaration) 5646 OverloadedDecl = OldDecl; 5647 else if (!Previous.empty()) 5648 OverloadedDecl = Previous.getRepresentativeDecl(); 5649 if (OverloadedDecl) 5650 Diag(OverloadedDecl->getLocation(), 5651 diag::note_attribute_overloadable_prev_overload); 5652 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5653 Context)); 5654 } 5655 } 5656 5657 if (Redeclaration) { 5658 // NewFD and OldDecl represent declarations that need to be 5659 // merged. 5660 if (MergeFunctionDecl(NewFD, OldDecl)) { 5661 NewFD->setInvalidDecl(); 5662 return Redeclaration; 5663 } 5664 5665 Previous.clear(); 5666 Previous.addDecl(OldDecl); 5667 5668 if (FunctionTemplateDecl *OldTemplateDecl 5669 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5670 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5671 FunctionTemplateDecl *NewTemplateDecl 5672 = NewFD->getDescribedFunctionTemplate(); 5673 assert(NewTemplateDecl && "Template/non-template mismatch"); 5674 if (CXXMethodDecl *Method 5675 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5676 Method->setAccess(OldTemplateDecl->getAccess()); 5677 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5678 } 5679 5680 // If this is an explicit specialization of a member that is a function 5681 // template, mark it as a member specialization. 5682 if (IsExplicitSpecialization && 5683 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5684 NewTemplateDecl->setMemberSpecialization(); 5685 assert(OldTemplateDecl->isMemberSpecialization()); 5686 } 5687 5688 } else { 5689 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5690 NewFD->setAccess(OldDecl->getAccess()); 5691 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5692 } 5693 } 5694 } 5695 5696 // Semantic checking for this function declaration (in isolation). 5697 if (getLangOptions().CPlusPlus) { 5698 // C++-specific checks. 5699 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5700 CheckConstructor(Constructor); 5701 } else if (CXXDestructorDecl *Destructor = 5702 dyn_cast<CXXDestructorDecl>(NewFD)) { 5703 CXXRecordDecl *Record = Destructor->getParent(); 5704 QualType ClassType = Context.getTypeDeclType(Record); 5705 5706 // FIXME: Shouldn't we be able to perform this check even when the class 5707 // type is dependent? Both gcc and edg can handle that. 5708 if (!ClassType->isDependentType()) { 5709 DeclarationName Name 5710 = Context.DeclarationNames.getCXXDestructorName( 5711 Context.getCanonicalType(ClassType)); 5712 if (NewFD->getDeclName() != Name) { 5713 Diag(NewFD->getLocation(), diag::err_destructor_name); 5714 NewFD->setInvalidDecl(); 5715 return Redeclaration; 5716 } 5717 } 5718 } else if (CXXConversionDecl *Conversion 5719 = dyn_cast<CXXConversionDecl>(NewFD)) { 5720 ActOnConversionDeclarator(Conversion); 5721 } 5722 5723 // Find any virtual functions that this function overrides. 5724 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5725 if (!Method->isFunctionTemplateSpecialization() && 5726 !Method->getDescribedFunctionTemplate()) { 5727 if (AddOverriddenMethods(Method->getParent(), Method)) { 5728 // If the function was marked as "static", we have a problem. 5729 if (NewFD->getStorageClass() == SC_Static) { 5730 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5731 << NewFD->getDeclName(); 5732 for (CXXMethodDecl::method_iterator 5733 Overridden = Method->begin_overridden_methods(), 5734 OverriddenEnd = Method->end_overridden_methods(); 5735 Overridden != OverriddenEnd; 5736 ++Overridden) { 5737 Diag((*Overridden)->getLocation(), 5738 diag::note_overridden_virtual_function); 5739 } 5740 } 5741 } 5742 } 5743 } 5744 5745 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5746 if (NewFD->isOverloadedOperator() && 5747 CheckOverloadedOperatorDeclaration(NewFD)) { 5748 NewFD->setInvalidDecl(); 5749 return Redeclaration; 5750 } 5751 5752 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5753 if (NewFD->getLiteralIdentifier() && 5754 CheckLiteralOperatorDeclaration(NewFD)) { 5755 NewFD->setInvalidDecl(); 5756 return Redeclaration; 5757 } 5758 5759 // In C++, check default arguments now that we have merged decls. Unless 5760 // the lexical context is the class, because in this case this is done 5761 // during delayed parsing anyway. 5762 if (!CurContext->isRecord()) 5763 CheckCXXDefaultArguments(NewFD); 5764 5765 // If this function declares a builtin function, check the type of this 5766 // declaration against the expected type for the builtin. 5767 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5768 ASTContext::GetBuiltinTypeError Error; 5769 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5770 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5771 // The type of this function differs from the type of the builtin, 5772 // so forget about the builtin entirely. 5773 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5774 } 5775 } 5776 } 5777 return Redeclaration; 5778} 5779 5780void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5781 // C++11 [basic.start.main]p3: A program that declares main to be inline, 5782 // static or constexpr is ill-formed. 5783 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5784 // shall not appear in a declaration of main. 5785 // static main is not an error under C99, but we should warn about it. 5786 if (FD->getStorageClass() == SC_Static) 5787 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5788 ? diag::err_static_main : diag::warn_static_main) 5789 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5790 if (FD->isInlineSpecified()) 5791 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5792 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5793 if (FD->isConstexpr()) { 5794 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main) 5795 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc()); 5796 FD->setConstexpr(false); 5797 } 5798 5799 QualType T = FD->getType(); 5800 assert(T->isFunctionType() && "function decl is not of function type"); 5801 const FunctionType* FT = T->getAs<FunctionType>(); 5802 5803 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5804 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5805 FD->setInvalidDecl(true); 5806 } 5807 5808 // Treat protoless main() as nullary. 5809 if (isa<FunctionNoProtoType>(FT)) return; 5810 5811 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5812 unsigned nparams = FTP->getNumArgs(); 5813 assert(FD->getNumParams() == nparams); 5814 5815 bool HasExtraParameters = (nparams > 3); 5816 5817 // Darwin passes an undocumented fourth argument of type char**. If 5818 // other platforms start sprouting these, the logic below will start 5819 // getting shifty. 5820 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5821 HasExtraParameters = false; 5822 5823 if (HasExtraParameters) { 5824 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5825 FD->setInvalidDecl(true); 5826 nparams = 3; 5827 } 5828 5829 // FIXME: a lot of the following diagnostics would be improved 5830 // if we had some location information about types. 5831 5832 QualType CharPP = 5833 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5834 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5835 5836 for (unsigned i = 0; i < nparams; ++i) { 5837 QualType AT = FTP->getArgType(i); 5838 5839 bool mismatch = true; 5840 5841 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5842 mismatch = false; 5843 else if (Expected[i] == CharPP) { 5844 // As an extension, the following forms are okay: 5845 // char const ** 5846 // char const * const * 5847 // char * const * 5848 5849 QualifierCollector qs; 5850 const PointerType* PT; 5851 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5852 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5853 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5854 qs.removeConst(); 5855 mismatch = !qs.empty(); 5856 } 5857 } 5858 5859 if (mismatch) { 5860 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5861 // TODO: suggest replacing given type with expected type 5862 FD->setInvalidDecl(true); 5863 } 5864 } 5865 5866 if (nparams == 1 && !FD->isInvalidDecl()) { 5867 Diag(FD->getLocation(), diag::warn_main_one_arg); 5868 } 5869 5870 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5871 Diag(FD->getLocation(), diag::err_main_template_decl); 5872 FD->setInvalidDecl(); 5873 } 5874} 5875 5876bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5877 // FIXME: Need strict checking. In C89, we need to check for 5878 // any assignment, increment, decrement, function-calls, or 5879 // commas outside of a sizeof. In C99, it's the same list, 5880 // except that the aforementioned are allowed in unevaluated 5881 // expressions. Everything else falls under the 5882 // "may accept other forms of constant expressions" exception. 5883 // (We never end up here for C++, so the constant expression 5884 // rules there don't matter.) 5885 if (Init->isConstantInitializer(Context, false)) 5886 return false; 5887 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5888 << Init->getSourceRange(); 5889 return true; 5890} 5891 5892namespace { 5893 // Visits an initialization expression to see if OrigDecl is evaluated in 5894 // its own initialization and throws a warning if it does. 5895 class SelfReferenceChecker 5896 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5897 Sema &S; 5898 Decl *OrigDecl; 5899 bool isRecordType; 5900 bool isPODType; 5901 5902 public: 5903 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5904 5905 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5906 S(S), OrigDecl(OrigDecl) { 5907 isPODType = false; 5908 isRecordType = false; 5909 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5910 isPODType = VD->getType().isPODType(S.Context); 5911 isRecordType = VD->getType()->isRecordType(); 5912 } 5913 } 5914 5915 void VisitExpr(Expr *E) { 5916 if (isa<ObjCMessageExpr>(*E)) return; 5917 if (isRecordType) { 5918 Expr *expr = E; 5919 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5920 ValueDecl *VD = ME->getMemberDecl(); 5921 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5922 expr = ME->getBase(); 5923 } 5924 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5925 HandleDeclRefExpr(DRE); 5926 return; 5927 } 5928 } 5929 Inherited::VisitExpr(E); 5930 } 5931 5932 void VisitMemberExpr(MemberExpr *E) { 5933 if (E->getType()->canDecayToPointerType()) return; 5934 if (isa<FieldDecl>(E->getMemberDecl())) 5935 if (DeclRefExpr *DRE 5936 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5937 HandleDeclRefExpr(DRE); 5938 return; 5939 } 5940 Inherited::VisitMemberExpr(E); 5941 } 5942 5943 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5944 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5945 (isRecordType && E->getCastKind() == CK_NoOp)) { 5946 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5947 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5948 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5949 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5950 HandleDeclRefExpr(DRE); 5951 return; 5952 } 5953 } 5954 Inherited::VisitImplicitCastExpr(E); 5955 } 5956 5957 void VisitUnaryOperator(UnaryOperator *E) { 5958 // For POD record types, addresses of its own members are well-defined. 5959 if (isRecordType && isPODType) return; 5960 Inherited::VisitUnaryOperator(E); 5961 } 5962 5963 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5964 Decl* ReferenceDecl = DRE->getDecl(); 5965 if (OrigDecl != ReferenceDecl) return; 5966 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5967 Sema::NotForRedeclaration); 5968 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5969 S.PDiag(diag::warn_uninit_self_reference_in_init) 5970 << Result.getLookupName() 5971 << OrigDecl->getLocation() 5972 << DRE->getSourceRange()); 5973 } 5974 }; 5975} 5976 5977/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5978void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5979 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5980} 5981 5982/// AddInitializerToDecl - Adds the initializer Init to the 5983/// declaration dcl. If DirectInit is true, this is C++ direct 5984/// initialization rather than copy initialization. 5985void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5986 bool DirectInit, bool TypeMayContainAuto) { 5987 // If there is no declaration, there was an error parsing it. Just ignore 5988 // the initializer. 5989 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5990 return; 5991 5992 // Check for self-references within variable initializers. 5993 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5994 // Variables declared within a function/method body are handled 5995 // by a dataflow analysis. 5996 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5997 CheckSelfReference(RealDecl, Init); 5998 } 5999 else { 6000 CheckSelfReference(RealDecl, Init); 6001 } 6002 6003 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 6004 // With declarators parsed the way they are, the parser cannot 6005 // distinguish between a normal initializer and a pure-specifier. 6006 // Thus this grotesque test. 6007 IntegerLiteral *IL; 6008 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 6009 Context.getCanonicalType(IL->getType()) == Context.IntTy) 6010 CheckPureMethod(Method, Init->getSourceRange()); 6011 else { 6012 Diag(Method->getLocation(), diag::err_member_function_initialization) 6013 << Method->getDeclName() << Init->getSourceRange(); 6014 Method->setInvalidDecl(); 6015 } 6016 return; 6017 } 6018 6019 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 6020 if (!VDecl) { 6021 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 6022 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 6023 RealDecl->setInvalidDecl(); 6024 return; 6025 } 6026 6027 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 6028 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 6029 TypeSourceInfo *DeducedType = 0; 6030 if (DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType) == 6031 DAR_Failed) 6032 DiagnoseAutoDeductionFailure(VDecl, Init); 6033 if (!DeducedType) { 6034 RealDecl->setInvalidDecl(); 6035 return; 6036 } 6037 VDecl->setTypeSourceInfo(DeducedType); 6038 VDecl->setType(DeducedType->getType()); 6039 6040 // In ARC, infer lifetime. 6041 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 6042 VDecl->setInvalidDecl(); 6043 6044 // If this is a redeclaration, check that the type we just deduced matches 6045 // the previously declared type. 6046 if (VarDecl *Old = VDecl->getPreviousDecl()) 6047 MergeVarDeclTypes(VDecl, Old); 6048 } 6049 6050 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6051 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6052 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6053 VDecl->setInvalidDecl(); 6054 return; 6055 } 6056 6057 6058 // A definition must end up with a complete type, which means it must be 6059 // complete with the restriction that an array type might be completed by the 6060 // initializer; note that later code assumes this restriction. 6061 QualType BaseDeclType = VDecl->getType(); 6062 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6063 BaseDeclType = Array->getElementType(); 6064 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6065 diag::err_typecheck_decl_incomplete_type)) { 6066 RealDecl->setInvalidDecl(); 6067 return; 6068 } 6069 6070 // The variable can not have an abstract class type. 6071 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6072 diag::err_abstract_type_in_decl, 6073 AbstractVariableType)) 6074 VDecl->setInvalidDecl(); 6075 6076 const VarDecl *Def; 6077 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6078 Diag(VDecl->getLocation(), diag::err_redefinition) 6079 << VDecl->getDeclName(); 6080 Diag(Def->getLocation(), diag::note_previous_definition); 6081 VDecl->setInvalidDecl(); 6082 return; 6083 } 6084 6085 const VarDecl* PrevInit = 0; 6086 if (getLangOptions().CPlusPlus) { 6087 // C++ [class.static.data]p4 6088 // If a static data member is of const integral or const 6089 // enumeration type, its declaration in the class definition can 6090 // specify a constant-initializer which shall be an integral 6091 // constant expression (5.19). In that case, the member can appear 6092 // in integral constant expressions. The member shall still be 6093 // defined in a namespace scope if it is used in the program and the 6094 // namespace scope definition shall not contain an initializer. 6095 // 6096 // We already performed a redefinition check above, but for static 6097 // data members we also need to check whether there was an in-class 6098 // declaration with an initializer. 6099 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6100 Diag(VDecl->getLocation(), diag::err_redefinition) 6101 << VDecl->getDeclName(); 6102 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6103 return; 6104 } 6105 6106 if (VDecl->hasLocalStorage()) 6107 getCurFunction()->setHasBranchProtectedScope(); 6108 6109 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6110 VDecl->setInvalidDecl(); 6111 return; 6112 } 6113 } 6114 6115 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6116 // a kernel function cannot be initialized." 6117 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6118 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6119 VDecl->setInvalidDecl(); 6120 return; 6121 } 6122 6123 // Get the decls type and save a reference for later, since 6124 // CheckInitializerTypes may change it. 6125 QualType DclT = VDecl->getType(), SavT = DclT; 6126 6127 // Perform the initialization. 6128 if (!VDecl->isInvalidDecl()) { 6129 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6130 InitializationKind Kind 6131 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6132 Init->getLocStart(), 6133 Init->getLocEnd()) 6134 : InitializationKind::CreateCopy(VDecl->getLocation(), 6135 Init->getLocStart()); 6136 6137 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6138 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6139 MultiExprArg(*this, &Init, 1), 6140 &DclT); 6141 if (Result.isInvalid()) { 6142 VDecl->setInvalidDecl(); 6143 return; 6144 } 6145 6146 Init = Result.takeAs<Expr>(); 6147 } 6148 6149 // If the type changed, it means we had an incomplete type that was 6150 // completed by the initializer. For example: 6151 // int ary[] = { 1, 3, 5 }; 6152 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6153 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6154 VDecl->setType(DclT); 6155 Init->setType(DclT.getNonReferenceType()); 6156 } 6157 6158 // Check any implicit conversions within the expression. 6159 CheckImplicitConversions(Init, VDecl->getLocation()); 6160 6161 if (!VDecl->isInvalidDecl()) 6162 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6163 6164 Init = MaybeCreateExprWithCleanups(Init); 6165 // Attach the initializer to the decl. 6166 VDecl->setInit(Init); 6167 6168 if (VDecl->isLocalVarDecl()) { 6169 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6170 // static storage duration shall be constant expressions or string literals. 6171 // C++ does not have this restriction. 6172 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6173 VDecl->getStorageClass() == SC_Static) 6174 CheckForConstantInitializer(Init, DclT); 6175 } else if (VDecl->isStaticDataMember() && 6176 VDecl->getLexicalDeclContext()->isRecord()) { 6177 // This is an in-class initialization for a static data member, e.g., 6178 // 6179 // struct S { 6180 // static const int value = 17; 6181 // }; 6182 6183 // C++ [class.mem]p4: 6184 // A member-declarator can contain a constant-initializer only 6185 // if it declares a static member (9.4) of const integral or 6186 // const enumeration type, see 9.4.2. 6187 // 6188 // C++11 [class.static.data]p3: 6189 // If a non-volatile const static data member is of integral or 6190 // enumeration type, its declaration in the class definition can 6191 // specify a brace-or-equal-initializer in which every initalizer-clause 6192 // that is an assignment-expression is a constant expression. A static 6193 // data member of literal type can be declared in the class definition 6194 // with the constexpr specifier; if so, its declaration shall specify a 6195 // brace-or-equal-initializer in which every initializer-clause that is 6196 // an assignment-expression is a constant expression. 6197 6198 // Do nothing on dependent types. 6199 if (DclT->isDependentType()) { 6200 6201 // Allow any 'static constexpr' members, whether or not they are of literal 6202 // type. We separately check that the initializer is a constant expression, 6203 // which implicitly requires the member to be of literal type. 6204 } else if (VDecl->isConstexpr()) { 6205 6206 // Require constness. 6207 } else if (!DclT.isConstQualified()) { 6208 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6209 << Init->getSourceRange(); 6210 VDecl->setInvalidDecl(); 6211 6212 // We allow integer constant expressions in all cases. 6213 } else if (DclT->isIntegralOrEnumerationType()) { 6214 // Check whether the expression is a constant expression. 6215 SourceLocation Loc; 6216 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6217 // In C++11, a non-constexpr const static data member with an 6218 // in-class initializer cannot be volatile. 6219 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6220 else if (Init->isValueDependent()) 6221 ; // Nothing to check. 6222 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6223 ; // Ok, it's an ICE! 6224 else if (Init->isEvaluatable(Context)) { 6225 // If we can constant fold the initializer through heroics, accept it, 6226 // but report this as a use of an extension for -pedantic. 6227 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6228 << Init->getSourceRange(); 6229 } else { 6230 // Otherwise, this is some crazy unknown case. Report the issue at the 6231 // location provided by the isIntegerConstantExpr failed check. 6232 Diag(Loc, diag::err_in_class_initializer_non_constant) 6233 << Init->getSourceRange(); 6234 VDecl->setInvalidDecl(); 6235 } 6236 6237 // We allow foldable floating-point constants as an extension. 6238 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6239 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6240 << DclT << Init->getSourceRange(); 6241 if (getLangOptions().CPlusPlus0x) 6242 Diag(VDecl->getLocation(), 6243 diag::note_in_class_initializer_float_type_constexpr) 6244 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6245 6246 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6247 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6248 << Init->getSourceRange(); 6249 VDecl->setInvalidDecl(); 6250 } 6251 6252 // Suggest adding 'constexpr' in C++11 for literal types. 6253 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6254 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6255 << DclT << Init->getSourceRange() 6256 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6257 VDecl->setConstexpr(true); 6258 6259 } else { 6260 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6261 << DclT << Init->getSourceRange(); 6262 VDecl->setInvalidDecl(); 6263 } 6264 } else if (VDecl->isFileVarDecl()) { 6265 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6266 (!getLangOptions().CPlusPlus || 6267 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6268 Diag(VDecl->getLocation(), diag::warn_extern_init); 6269 6270 // C99 6.7.8p4. All file scoped initializers need to be constant. 6271 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6272 CheckForConstantInitializer(Init, DclT); 6273 } 6274 6275 CheckCompleteVariableDeclaration(VDecl); 6276} 6277 6278/// ActOnInitializerError - Given that there was an error parsing an 6279/// initializer for the given declaration, try to return to some form 6280/// of sanity. 6281void Sema::ActOnInitializerError(Decl *D) { 6282 // Our main concern here is re-establishing invariants like "a 6283 // variable's type is either dependent or complete". 6284 if (!D || D->isInvalidDecl()) return; 6285 6286 VarDecl *VD = dyn_cast<VarDecl>(D); 6287 if (!VD) return; 6288 6289 // Auto types are meaningless if we can't make sense of the initializer. 6290 if (ParsingInitForAutoVars.count(D)) { 6291 D->setInvalidDecl(); 6292 return; 6293 } 6294 6295 QualType Ty = VD->getType(); 6296 if (Ty->isDependentType()) return; 6297 6298 // Require a complete type. 6299 if (RequireCompleteType(VD->getLocation(), 6300 Context.getBaseElementType(Ty), 6301 diag::err_typecheck_decl_incomplete_type)) { 6302 VD->setInvalidDecl(); 6303 return; 6304 } 6305 6306 // Require an abstract type. 6307 if (RequireNonAbstractType(VD->getLocation(), Ty, 6308 diag::err_abstract_type_in_decl, 6309 AbstractVariableType)) { 6310 VD->setInvalidDecl(); 6311 return; 6312 } 6313 6314 // Don't bother complaining about constructors or destructors, 6315 // though. 6316} 6317 6318void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6319 bool TypeMayContainAuto) { 6320 // If there is no declaration, there was an error parsing it. Just ignore it. 6321 if (RealDecl == 0) 6322 return; 6323 6324 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6325 QualType Type = Var->getType(); 6326 6327 // C++11 [dcl.spec.auto]p3 6328 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6329 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6330 << Var->getDeclName() << Type; 6331 Var->setInvalidDecl(); 6332 return; 6333 } 6334 6335 // C++11 [class.static.data]p3: A static data member can be declared with 6336 // the constexpr specifier; if so, its declaration shall specify 6337 // a brace-or-equal-initializer. 6338 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6339 // the definition of a variable [...] or the declaration of a static data 6340 // member. 6341 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6342 if (Var->isStaticDataMember()) 6343 Diag(Var->getLocation(), 6344 diag::err_constexpr_static_mem_var_requires_init) 6345 << Var->getDeclName(); 6346 else 6347 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6348 Var->setInvalidDecl(); 6349 return; 6350 } 6351 6352 switch (Var->isThisDeclarationADefinition()) { 6353 case VarDecl::Definition: 6354 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6355 break; 6356 6357 // We have an out-of-line definition of a static data member 6358 // that has an in-class initializer, so we type-check this like 6359 // a declaration. 6360 // 6361 // Fall through 6362 6363 case VarDecl::DeclarationOnly: 6364 // It's only a declaration. 6365 6366 // Block scope. C99 6.7p7: If an identifier for an object is 6367 // declared with no linkage (C99 6.2.2p6), the type for the 6368 // object shall be complete. 6369 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6370 !Var->getLinkage() && !Var->isInvalidDecl() && 6371 RequireCompleteType(Var->getLocation(), Type, 6372 diag::err_typecheck_decl_incomplete_type)) 6373 Var->setInvalidDecl(); 6374 6375 // Make sure that the type is not abstract. 6376 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6377 RequireNonAbstractType(Var->getLocation(), Type, 6378 diag::err_abstract_type_in_decl, 6379 AbstractVariableType)) 6380 Var->setInvalidDecl(); 6381 return; 6382 6383 case VarDecl::TentativeDefinition: 6384 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6385 // object that has file scope without an initializer, and without a 6386 // storage-class specifier or with the storage-class specifier "static", 6387 // constitutes a tentative definition. Note: A tentative definition with 6388 // external linkage is valid (C99 6.2.2p5). 6389 if (!Var->isInvalidDecl()) { 6390 if (const IncompleteArrayType *ArrayT 6391 = Context.getAsIncompleteArrayType(Type)) { 6392 if (RequireCompleteType(Var->getLocation(), 6393 ArrayT->getElementType(), 6394 diag::err_illegal_decl_array_incomplete_type)) 6395 Var->setInvalidDecl(); 6396 } else if (Var->getStorageClass() == SC_Static) { 6397 // C99 6.9.2p3: If the declaration of an identifier for an object is 6398 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6399 // declared type shall not be an incomplete type. 6400 // NOTE: code such as the following 6401 // static struct s; 6402 // struct s { int a; }; 6403 // is accepted by gcc. Hence here we issue a warning instead of 6404 // an error and we do not invalidate the static declaration. 6405 // NOTE: to avoid multiple warnings, only check the first declaration. 6406 if (Var->getPreviousDecl() == 0) 6407 RequireCompleteType(Var->getLocation(), Type, 6408 diag::ext_typecheck_decl_incomplete_type); 6409 } 6410 } 6411 6412 // Record the tentative definition; we're done. 6413 if (!Var->isInvalidDecl()) 6414 TentativeDefinitions.push_back(Var); 6415 return; 6416 } 6417 6418 // Provide a specific diagnostic for uninitialized variable 6419 // definitions with incomplete array type. 6420 if (Type->isIncompleteArrayType()) { 6421 Diag(Var->getLocation(), 6422 diag::err_typecheck_incomplete_array_needs_initializer); 6423 Var->setInvalidDecl(); 6424 return; 6425 } 6426 6427 // Provide a specific diagnostic for uninitialized variable 6428 // definitions with reference type. 6429 if (Type->isReferenceType()) { 6430 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6431 << Var->getDeclName() 6432 << SourceRange(Var->getLocation(), Var->getLocation()); 6433 Var->setInvalidDecl(); 6434 return; 6435 } 6436 6437 // Do not attempt to type-check the default initializer for a 6438 // variable with dependent type. 6439 if (Type->isDependentType()) 6440 return; 6441 6442 if (Var->isInvalidDecl()) 6443 return; 6444 6445 if (RequireCompleteType(Var->getLocation(), 6446 Context.getBaseElementType(Type), 6447 diag::err_typecheck_decl_incomplete_type)) { 6448 Var->setInvalidDecl(); 6449 return; 6450 } 6451 6452 // The variable can not have an abstract class type. 6453 if (RequireNonAbstractType(Var->getLocation(), Type, 6454 diag::err_abstract_type_in_decl, 6455 AbstractVariableType)) { 6456 Var->setInvalidDecl(); 6457 return; 6458 } 6459 6460 // Check for jumps past the implicit initializer. C++0x 6461 // clarifies that this applies to a "variable with automatic 6462 // storage duration", not a "local variable". 6463 // C++11 [stmt.dcl]p3 6464 // A program that jumps from a point where a variable with automatic 6465 // storage duration is not in scope to a point where it is in scope is 6466 // ill-formed unless the variable has scalar type, class type with a 6467 // trivial default constructor and a trivial destructor, a cv-qualified 6468 // version of one of these types, or an array of one of the preceding 6469 // types and is declared without an initializer. 6470 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6471 if (const RecordType *Record 6472 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6473 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6474 // Mark the function for further checking even if the looser rules of 6475 // C++11 do not require such checks, so that we can diagnose 6476 // incompatibilities with C++98. 6477 if (!CXXRecord->isPOD()) 6478 getCurFunction()->setHasBranchProtectedScope(); 6479 } 6480 } 6481 6482 // C++03 [dcl.init]p9: 6483 // If no initializer is specified for an object, and the 6484 // object is of (possibly cv-qualified) non-POD class type (or 6485 // array thereof), the object shall be default-initialized; if 6486 // the object is of const-qualified type, the underlying class 6487 // type shall have a user-declared default 6488 // constructor. Otherwise, if no initializer is specified for 6489 // a non- static object, the object and its subobjects, if 6490 // any, have an indeterminate initial value); if the object 6491 // or any of its subobjects are of const-qualified type, the 6492 // program is ill-formed. 6493 // C++0x [dcl.init]p11: 6494 // If no initializer is specified for an object, the object is 6495 // default-initialized; [...]. 6496 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6497 InitializationKind Kind 6498 = InitializationKind::CreateDefault(Var->getLocation()); 6499 6500 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6501 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6502 MultiExprArg(*this, 0, 0)); 6503 if (Init.isInvalid()) 6504 Var->setInvalidDecl(); 6505 else if (Init.get()) 6506 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6507 6508 CheckCompleteVariableDeclaration(Var); 6509 } 6510} 6511 6512void Sema::ActOnCXXForRangeDecl(Decl *D) { 6513 VarDecl *VD = dyn_cast<VarDecl>(D); 6514 if (!VD) { 6515 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6516 D->setInvalidDecl(); 6517 return; 6518 } 6519 6520 VD->setCXXForRangeDecl(true); 6521 6522 // for-range-declaration cannot be given a storage class specifier. 6523 int Error = -1; 6524 switch (VD->getStorageClassAsWritten()) { 6525 case SC_None: 6526 break; 6527 case SC_Extern: 6528 Error = 0; 6529 break; 6530 case SC_Static: 6531 Error = 1; 6532 break; 6533 case SC_PrivateExtern: 6534 Error = 2; 6535 break; 6536 case SC_Auto: 6537 Error = 3; 6538 break; 6539 case SC_Register: 6540 Error = 4; 6541 break; 6542 case SC_OpenCLWorkGroupLocal: 6543 llvm_unreachable("Unexpected storage class"); 6544 } 6545 if (VD->isConstexpr()) 6546 Error = 5; 6547 if (Error != -1) { 6548 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6549 << VD->getDeclName() << Error; 6550 D->setInvalidDecl(); 6551 } 6552} 6553 6554void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6555 if (var->isInvalidDecl()) return; 6556 6557 // In ARC, don't allow jumps past the implicit initialization of a 6558 // local retaining variable. 6559 if (getLangOptions().ObjCAutoRefCount && 6560 var->hasLocalStorage()) { 6561 switch (var->getType().getObjCLifetime()) { 6562 case Qualifiers::OCL_None: 6563 case Qualifiers::OCL_ExplicitNone: 6564 case Qualifiers::OCL_Autoreleasing: 6565 break; 6566 6567 case Qualifiers::OCL_Weak: 6568 case Qualifiers::OCL_Strong: 6569 getCurFunction()->setHasBranchProtectedScope(); 6570 break; 6571 } 6572 } 6573 6574 // All the following checks are C++ only. 6575 if (!getLangOptions().CPlusPlus) return; 6576 6577 QualType baseType = Context.getBaseElementType(var->getType()); 6578 if (baseType->isDependentType()) return; 6579 6580 // __block variables might require us to capture a copy-initializer. 6581 if (var->hasAttr<BlocksAttr>()) { 6582 // It's currently invalid to ever have a __block variable with an 6583 // array type; should we diagnose that here? 6584 6585 // Regardless, we don't want to ignore array nesting when 6586 // constructing this copy. 6587 QualType type = var->getType(); 6588 6589 if (type->isStructureOrClassType()) { 6590 SourceLocation poi = var->getLocation(); 6591 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6592 ExprResult result = 6593 PerformCopyInitialization( 6594 InitializedEntity::InitializeBlock(poi, type, false), 6595 poi, Owned(varRef)); 6596 if (!result.isInvalid()) { 6597 result = MaybeCreateExprWithCleanups(result); 6598 Expr *init = result.takeAs<Expr>(); 6599 Context.setBlockVarCopyInits(var, init); 6600 } 6601 } 6602 } 6603 6604 Expr *Init = var->getInit(); 6605 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6606 6607 if (!var->getDeclContext()->isDependentContext() && Init) { 6608 if (IsGlobal && !var->isConstexpr() && 6609 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6610 var->getLocation()) 6611 != DiagnosticsEngine::Ignored && 6612 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6613 Diag(var->getLocation(), diag::warn_global_constructor) 6614 << Init->getSourceRange(); 6615 6616 if (var->isConstexpr()) { 6617 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6618 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6619 SourceLocation DiagLoc = var->getLocation(); 6620 // If the note doesn't add any useful information other than a source 6621 // location, fold it into the primary diagnostic. 6622 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6623 diag::note_invalid_subexpr_in_const_expr) { 6624 DiagLoc = Notes[0].first; 6625 Notes.clear(); 6626 } 6627 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6628 << var << Init->getSourceRange(); 6629 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6630 Diag(Notes[I].first, Notes[I].second); 6631 } 6632 } else if (var->isUsableInConstantExpressions()) { 6633 // Check whether the initializer of a const variable of integral or 6634 // enumeration type is an ICE now, since we can't tell whether it was 6635 // initialized by a constant expression if we check later. 6636 var->checkInitIsICE(); 6637 } 6638 } 6639 6640 // Require the destructor. 6641 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6642 FinalizeVarWithDestructor(var, recordType); 6643} 6644 6645/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6646/// any semantic actions necessary after any initializer has been attached. 6647void 6648Sema::FinalizeDeclaration(Decl *ThisDecl) { 6649 // Note that we are no longer parsing the initializer for this declaration. 6650 ParsingInitForAutoVars.erase(ThisDecl); 6651} 6652 6653Sema::DeclGroupPtrTy 6654Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6655 Decl **Group, unsigned NumDecls) { 6656 SmallVector<Decl*, 8> Decls; 6657 6658 if (DS.isTypeSpecOwned()) 6659 Decls.push_back(DS.getRepAsDecl()); 6660 6661 for (unsigned i = 0; i != NumDecls; ++i) 6662 if (Decl *D = Group[i]) 6663 Decls.push_back(D); 6664 6665 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6666 DS.getTypeSpecType() == DeclSpec::TST_auto); 6667} 6668 6669/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6670/// group, performing any necessary semantic checking. 6671Sema::DeclGroupPtrTy 6672Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6673 bool TypeMayContainAuto) { 6674 // C++0x [dcl.spec.auto]p7: 6675 // If the type deduced for the template parameter U is not the same in each 6676 // deduction, the program is ill-formed. 6677 // FIXME: When initializer-list support is added, a distinction is needed 6678 // between the deduced type U and the deduced type which 'auto' stands for. 6679 // auto a = 0, b = { 1, 2, 3 }; 6680 // is legal because the deduced type U is 'int' in both cases. 6681 if (TypeMayContainAuto && NumDecls > 1) { 6682 QualType Deduced; 6683 CanQualType DeducedCanon; 6684 VarDecl *DeducedDecl = 0; 6685 for (unsigned i = 0; i != NumDecls; ++i) { 6686 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6687 AutoType *AT = D->getType()->getContainedAutoType(); 6688 // Don't reissue diagnostics when instantiating a template. 6689 if (AT && D->isInvalidDecl()) 6690 break; 6691 if (AT && AT->isDeduced()) { 6692 QualType U = AT->getDeducedType(); 6693 CanQualType UCanon = Context.getCanonicalType(U); 6694 if (Deduced.isNull()) { 6695 Deduced = U; 6696 DeducedCanon = UCanon; 6697 DeducedDecl = D; 6698 } else if (DeducedCanon != UCanon) { 6699 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6700 diag::err_auto_different_deductions) 6701 << Deduced << DeducedDecl->getDeclName() 6702 << U << D->getDeclName() 6703 << DeducedDecl->getInit()->getSourceRange() 6704 << D->getInit()->getSourceRange(); 6705 D->setInvalidDecl(); 6706 break; 6707 } 6708 } 6709 } 6710 } 6711 } 6712 6713 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6714} 6715 6716 6717/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6718/// to introduce parameters into function prototype scope. 6719Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6720 const DeclSpec &DS = D.getDeclSpec(); 6721 6722 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6723 // C++03 [dcl.stc]p2 also permits 'auto'. 6724 VarDecl::StorageClass StorageClass = SC_None; 6725 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6726 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6727 StorageClass = SC_Register; 6728 StorageClassAsWritten = SC_Register; 6729 } else if (getLangOptions().CPlusPlus && 6730 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6731 StorageClass = SC_Auto; 6732 StorageClassAsWritten = SC_Auto; 6733 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6734 Diag(DS.getStorageClassSpecLoc(), 6735 diag::err_invalid_storage_class_in_func_decl); 6736 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6737 } 6738 6739 if (D.getDeclSpec().isThreadSpecified()) 6740 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6741 if (D.getDeclSpec().isConstexprSpecified()) 6742 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6743 << 0; 6744 6745 DiagnoseFunctionSpecifiers(D); 6746 6747 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6748 QualType parmDeclType = TInfo->getType(); 6749 6750 if (getLangOptions().CPlusPlus) { 6751 // Check that there are no default arguments inside the type of this 6752 // parameter. 6753 CheckExtraCXXDefaultArguments(D); 6754 6755 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6756 if (D.getCXXScopeSpec().isSet()) { 6757 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6758 << D.getCXXScopeSpec().getRange(); 6759 D.getCXXScopeSpec().clear(); 6760 } 6761 } 6762 6763 // Ensure we have a valid name 6764 IdentifierInfo *II = 0; 6765 if (D.hasName()) { 6766 II = D.getIdentifier(); 6767 if (!II) { 6768 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6769 << GetNameForDeclarator(D).getName().getAsString(); 6770 D.setInvalidType(true); 6771 } 6772 } 6773 6774 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6775 if (II) { 6776 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6777 ForRedeclaration); 6778 LookupName(R, S); 6779 if (R.isSingleResult()) { 6780 NamedDecl *PrevDecl = R.getFoundDecl(); 6781 if (PrevDecl->isTemplateParameter()) { 6782 // Maybe we will complain about the shadowed template parameter. 6783 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6784 // Just pretend that we didn't see the previous declaration. 6785 PrevDecl = 0; 6786 } else if (S->isDeclScope(PrevDecl)) { 6787 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6788 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6789 6790 // Recover by removing the name 6791 II = 0; 6792 D.SetIdentifier(0, D.getIdentifierLoc()); 6793 D.setInvalidType(true); 6794 } 6795 } 6796 } 6797 6798 // Temporarily put parameter variables in the translation unit, not 6799 // the enclosing context. This prevents them from accidentally 6800 // looking like class members in C++. 6801 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6802 D.getSourceRange().getBegin(), 6803 D.getIdentifierLoc(), II, 6804 parmDeclType, TInfo, 6805 StorageClass, StorageClassAsWritten); 6806 6807 if (D.isInvalidType()) 6808 New->setInvalidDecl(); 6809 6810 assert(S->isFunctionPrototypeScope()); 6811 assert(S->getFunctionPrototypeDepth() >= 1); 6812 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6813 S->getNextFunctionPrototypeIndex()); 6814 6815 // Add the parameter declaration into this scope. 6816 S->AddDecl(New); 6817 if (II) 6818 IdResolver.AddDecl(New); 6819 6820 ProcessDeclAttributes(S, New, D); 6821 6822 if (D.getDeclSpec().isModulePrivateSpecified()) 6823 Diag(New->getLocation(), diag::err_module_private_local) 6824 << 1 << New->getDeclName() 6825 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6826 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6827 6828 if (New->hasAttr<BlocksAttr>()) { 6829 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6830 } 6831 return New; 6832} 6833 6834/// \brief Synthesizes a variable for a parameter arising from a 6835/// typedef. 6836ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6837 SourceLocation Loc, 6838 QualType T) { 6839 /* FIXME: setting StartLoc == Loc. 6840 Would it be worth to modify callers so as to provide proper source 6841 location for the unnamed parameters, embedding the parameter's type? */ 6842 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6843 T, Context.getTrivialTypeSourceInfo(T, Loc), 6844 SC_None, SC_None, 0); 6845 Param->setImplicit(); 6846 return Param; 6847} 6848 6849void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6850 ParmVarDecl * const *ParamEnd) { 6851 // Don't diagnose unused-parameter errors in template instantiations; we 6852 // will already have done so in the template itself. 6853 if (!ActiveTemplateInstantiations.empty()) 6854 return; 6855 6856 for (; Param != ParamEnd; ++Param) { 6857 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 6858 !(*Param)->hasAttr<UnusedAttr>()) { 6859 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6860 << (*Param)->getDeclName(); 6861 } 6862 } 6863} 6864 6865void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6866 ParmVarDecl * const *ParamEnd, 6867 QualType ReturnTy, 6868 NamedDecl *D) { 6869 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6870 return; 6871 6872 // Warn if the return value is pass-by-value and larger than the specified 6873 // threshold. 6874 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 6875 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6876 if (Size > LangOpts.NumLargeByValueCopy) 6877 Diag(D->getLocation(), diag::warn_return_value_size) 6878 << D->getDeclName() << Size; 6879 } 6880 6881 // Warn if any parameter is pass-by-value and larger than the specified 6882 // threshold. 6883 for (; Param != ParamEnd; ++Param) { 6884 QualType T = (*Param)->getType(); 6885 if (T->isDependentType() || !T.isPODType(Context)) 6886 continue; 6887 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6888 if (Size > LangOpts.NumLargeByValueCopy) 6889 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6890 << (*Param)->getDeclName() << Size; 6891 } 6892} 6893 6894ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6895 SourceLocation NameLoc, IdentifierInfo *Name, 6896 QualType T, TypeSourceInfo *TSInfo, 6897 VarDecl::StorageClass StorageClass, 6898 VarDecl::StorageClass StorageClassAsWritten) { 6899 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6900 if (getLangOptions().ObjCAutoRefCount && 6901 T.getObjCLifetime() == Qualifiers::OCL_None && 6902 T->isObjCLifetimeType()) { 6903 6904 Qualifiers::ObjCLifetime lifetime; 6905 6906 // Special cases for arrays: 6907 // - if it's const, use __unsafe_unretained 6908 // - otherwise, it's an error 6909 if (T->isArrayType()) { 6910 if (!T.isConstQualified()) { 6911 DelayedDiagnostics.add( 6912 sema::DelayedDiagnostic::makeForbiddenType( 6913 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6914 } 6915 lifetime = Qualifiers::OCL_ExplicitNone; 6916 } else { 6917 lifetime = T->getObjCARCImplicitLifetime(); 6918 } 6919 T = Context.getLifetimeQualifiedType(T, lifetime); 6920 } 6921 6922 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6923 Context.getAdjustedParameterType(T), 6924 TSInfo, 6925 StorageClass, StorageClassAsWritten, 6926 0); 6927 6928 // Parameters can not be abstract class types. 6929 // For record types, this is done by the AbstractClassUsageDiagnoser once 6930 // the class has been completely parsed. 6931 if (!CurContext->isRecord() && 6932 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6933 AbstractParamType)) 6934 New->setInvalidDecl(); 6935 6936 // Parameter declarators cannot be interface types. All ObjC objects are 6937 // passed by reference. 6938 if (T->isObjCObjectType()) { 6939 Diag(NameLoc, 6940 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6941 << FixItHint::CreateInsertion(NameLoc, "*"); 6942 T = Context.getObjCObjectPointerType(T); 6943 New->setType(T); 6944 } 6945 6946 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6947 // duration shall not be qualified by an address-space qualifier." 6948 // Since all parameters have automatic store duration, they can not have 6949 // an address space. 6950 if (T.getAddressSpace() != 0) { 6951 Diag(NameLoc, diag::err_arg_with_address_space); 6952 New->setInvalidDecl(); 6953 } 6954 6955 return New; 6956} 6957 6958void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6959 SourceLocation LocAfterDecls) { 6960 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6961 6962 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6963 // for a K&R function. 6964 if (!FTI.hasPrototype) { 6965 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6966 --i; 6967 if (FTI.ArgInfo[i].Param == 0) { 6968 llvm::SmallString<256> Code; 6969 llvm::raw_svector_ostream(Code) << " int " 6970 << FTI.ArgInfo[i].Ident->getName() 6971 << ";\n"; 6972 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6973 << FTI.ArgInfo[i].Ident 6974 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6975 6976 // Implicitly declare the argument as type 'int' for lack of a better 6977 // type. 6978 AttributeFactory attrs; 6979 DeclSpec DS(attrs); 6980 const char* PrevSpec; // unused 6981 unsigned DiagID; // unused 6982 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6983 PrevSpec, DiagID); 6984 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6985 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6986 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6987 } 6988 } 6989 } 6990} 6991 6992Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6993 Declarator &D) { 6994 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6995 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6996 Scope *ParentScope = FnBodyScope->getParent(); 6997 6998 D.setFunctionDefinitionKind(FDK_Definition); 6999 Decl *DP = HandleDeclarator(ParentScope, D, 7000 MultiTemplateParamsArg(*this)); 7001 return ActOnStartOfFunctionDef(FnBodyScope, DP); 7002} 7003 7004static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 7005 // Don't warn about invalid declarations. 7006 if (FD->isInvalidDecl()) 7007 return false; 7008 7009 // Or declarations that aren't global. 7010 if (!FD->isGlobal()) 7011 return false; 7012 7013 // Don't warn about C++ member functions. 7014 if (isa<CXXMethodDecl>(FD)) 7015 return false; 7016 7017 // Don't warn about 'main'. 7018 if (FD->isMain()) 7019 return false; 7020 7021 // Don't warn about inline functions. 7022 if (FD->isInlined()) 7023 return false; 7024 7025 // Don't warn about function templates. 7026 if (FD->getDescribedFunctionTemplate()) 7027 return false; 7028 7029 // Don't warn about function template specializations. 7030 if (FD->isFunctionTemplateSpecialization()) 7031 return false; 7032 7033 bool MissingPrototype = true; 7034 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 7035 Prev; Prev = Prev->getPreviousDecl()) { 7036 // Ignore any declarations that occur in function or method 7037 // scope, because they aren't visible from the header. 7038 if (Prev->getDeclContext()->isFunctionOrMethod()) 7039 continue; 7040 7041 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 7042 break; 7043 } 7044 7045 return MissingPrototype; 7046} 7047 7048void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 7049 // Don't complain if we're in GNU89 mode and the previous definition 7050 // was an extern inline function. 7051 const FunctionDecl *Definition; 7052 if (FD->isDefined(Definition) && 7053 !canRedefineFunction(Definition, getLangOptions())) { 7054 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 7055 Definition->getStorageClass() == SC_Extern) 7056 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7057 << FD->getDeclName() << getLangOptions().CPlusPlus; 7058 else 7059 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7060 Diag(Definition->getLocation(), diag::note_previous_definition); 7061 } 7062} 7063 7064Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7065 // Clear the last template instantiation error context. 7066 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7067 7068 if (!D) 7069 return D; 7070 FunctionDecl *FD = 0; 7071 7072 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7073 FD = FunTmpl->getTemplatedDecl(); 7074 else 7075 FD = cast<FunctionDecl>(D); 7076 7077 // Enter a new function scope 7078 PushFunctionScope(); 7079 7080 // See if this is a redefinition. 7081 if (!FD->isLateTemplateParsed()) 7082 CheckForFunctionRedefinition(FD); 7083 7084 // Builtin functions cannot be defined. 7085 if (unsigned BuiltinID = FD->getBuiltinID()) { 7086 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7087 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7088 FD->setInvalidDecl(); 7089 } 7090 } 7091 7092 // The return type of a function definition must be complete 7093 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7094 QualType ResultType = FD->getResultType(); 7095 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7096 !FD->isInvalidDecl() && 7097 RequireCompleteType(FD->getLocation(), ResultType, 7098 diag::err_func_def_incomplete_result)) 7099 FD->setInvalidDecl(); 7100 7101 // GNU warning -Wmissing-prototypes: 7102 // Warn if a global function is defined without a previous 7103 // prototype declaration. This warning is issued even if the 7104 // definition itself provides a prototype. The aim is to detect 7105 // global functions that fail to be declared in header files. 7106 if (ShouldWarnAboutMissingPrototype(FD)) 7107 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7108 7109 if (FnBodyScope) 7110 PushDeclContext(FnBodyScope, FD); 7111 7112 // Check the validity of our function parameters 7113 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7114 /*CheckParameterNames=*/true); 7115 7116 // Introduce our parameters into the function scope 7117 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7118 ParmVarDecl *Param = FD->getParamDecl(p); 7119 Param->setOwningFunction(FD); 7120 7121 // If this has an identifier, add it to the scope stack. 7122 if (Param->getIdentifier() && FnBodyScope) { 7123 CheckShadow(FnBodyScope, Param); 7124 7125 PushOnScopeChains(Param, FnBodyScope); 7126 } 7127 } 7128 7129 // Checking attributes of current function definition 7130 // dllimport attribute. 7131 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7132 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7133 // dllimport attribute cannot be directly applied to definition. 7134 // Microsoft accepts dllimport for functions defined within class scope. 7135 if (!DA->isInherited() && 7136 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7137 Diag(FD->getLocation(), 7138 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7139 << "dllimport"; 7140 FD->setInvalidDecl(); 7141 return FD; 7142 } 7143 7144 // Visual C++ appears to not think this is an issue, so only issue 7145 // a warning when Microsoft extensions are disabled. 7146 if (!LangOpts.MicrosoftExt) { 7147 // If a symbol previously declared dllimport is later defined, the 7148 // attribute is ignored in subsequent references, and a warning is 7149 // emitted. 7150 Diag(FD->getLocation(), 7151 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7152 << FD->getName() << "dllimport"; 7153 } 7154 } 7155 return FD; 7156} 7157 7158/// \brief Given the set of return statements within a function body, 7159/// compute the variables that are subject to the named return value 7160/// optimization. 7161/// 7162/// Each of the variables that is subject to the named return value 7163/// optimization will be marked as NRVO variables in the AST, and any 7164/// return statement that has a marked NRVO variable as its NRVO candidate can 7165/// use the named return value optimization. 7166/// 7167/// This function applies a very simplistic algorithm for NRVO: if every return 7168/// statement in the function has the same NRVO candidate, that candidate is 7169/// the NRVO variable. 7170/// 7171/// FIXME: Employ a smarter algorithm that accounts for multiple return 7172/// statements and the lifetimes of the NRVO candidates. We should be able to 7173/// find a maximal set of NRVO variables. 7174void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7175 ReturnStmt **Returns = Scope->Returns.data(); 7176 7177 const VarDecl *NRVOCandidate = 0; 7178 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7179 if (!Returns[I]->getNRVOCandidate()) 7180 return; 7181 7182 if (!NRVOCandidate) 7183 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7184 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7185 return; 7186 } 7187 7188 if (NRVOCandidate) 7189 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7190} 7191 7192Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7193 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7194} 7195 7196Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7197 bool IsInstantiation) { 7198 FunctionDecl *FD = 0; 7199 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7200 if (FunTmpl) 7201 FD = FunTmpl->getTemplatedDecl(); 7202 else 7203 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7204 7205 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7206 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7207 7208 if (FD) { 7209 FD->setBody(Body); 7210 if (FD->isMain()) { 7211 // C and C++ allow for main to automagically return 0. 7212 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7213 FD->setHasImplicitReturnZero(true); 7214 WP.disableCheckFallThrough(); 7215 } else if (FD->hasAttr<NakedAttr>()) { 7216 // If the function is marked 'naked', don't complain about missing return 7217 // statements. 7218 WP.disableCheckFallThrough(); 7219 } 7220 7221 // MSVC permits the use of pure specifier (=0) on function definition, 7222 // defined at class scope, warn about this non standard construct. 7223 if (getLangOptions().MicrosoftExt && FD->isPure()) 7224 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7225 7226 if (!FD->isInvalidDecl()) { 7227 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7228 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7229 FD->getResultType(), FD); 7230 7231 // If this is a constructor, we need a vtable. 7232 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7233 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7234 7235 computeNRVO(Body, getCurFunction()); 7236 } 7237 7238 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7239 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7240 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7241 MD->setBody(Body); 7242 if (Body) 7243 MD->setEndLoc(Body->getLocEnd()); 7244 if (!MD->isInvalidDecl()) { 7245 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7246 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7247 MD->getResultType(), MD); 7248 7249 if (Body) 7250 computeNRVO(Body, getCurFunction()); 7251 } 7252 if (ObjCShouldCallSuperDealloc) { 7253 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7254 ObjCShouldCallSuperDealloc = false; 7255 } 7256 if (ObjCShouldCallSuperFinalize) { 7257 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7258 ObjCShouldCallSuperFinalize = false; 7259 } 7260 } else { 7261 return 0; 7262 } 7263 7264 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7265 "ObjC methods, which should have been handled in the block above."); 7266 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7267 "ObjC methods, which should have been handled in the block above."); 7268 7269 // Verify and clean out per-function state. 7270 if (Body) { 7271 // C++ constructors that have function-try-blocks can't have return 7272 // statements in the handlers of that block. (C++ [except.handle]p14) 7273 // Verify this. 7274 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7275 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7276 7277 // Verify that gotos and switch cases don't jump into scopes illegally. 7278 if (getCurFunction()->NeedsScopeChecking() && 7279 !dcl->isInvalidDecl() && 7280 !hasAnyUnrecoverableErrorsInThisFunction()) 7281 DiagnoseInvalidJumps(Body); 7282 7283 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7284 if (!Destructor->getParent()->isDependentType()) 7285 CheckDestructor(Destructor); 7286 7287 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7288 Destructor->getParent()); 7289 } 7290 7291 // If any errors have occurred, clear out any temporaries that may have 7292 // been leftover. This ensures that these temporaries won't be picked up for 7293 // deletion in some later function. 7294 if (PP.getDiagnostics().hasErrorOccurred() || 7295 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7296 DiscardCleanupsInEvaluationContext(); 7297 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7298 // Since the body is valid, issue any analysis-based warnings that are 7299 // enabled. 7300 ActivePolicy = &WP; 7301 } 7302 7303 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7304 !CheckConstexprFunctionBody(FD, Body)) 7305 FD->setInvalidDecl(); 7306 7307 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7308 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7309 assert(MaybeODRUseExprs.empty() && 7310 "Leftover expressions for odr-use checking"); 7311 } 7312 7313 if (!IsInstantiation) 7314 PopDeclContext(); 7315 7316 PopFunctionScopeInfo(ActivePolicy, dcl); 7317 7318 // If any errors have occurred, clear out any temporaries that may have 7319 // been leftover. This ensures that these temporaries won't be picked up for 7320 // deletion in some later function. 7321 if (getDiagnostics().hasErrorOccurred()) { 7322 DiscardCleanupsInEvaluationContext(); 7323 } 7324 7325 return dcl; 7326} 7327 7328 7329/// When we finish delayed parsing of an attribute, we must attach it to the 7330/// relevant Decl. 7331void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7332 ParsedAttributes &Attrs) { 7333 // Always attach attributes to the underlying decl. 7334 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) 7335 D = TD->getTemplatedDecl(); 7336 ProcessDeclAttributeList(S, D, Attrs.getList()); 7337} 7338 7339 7340/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7341/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7342NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7343 IdentifierInfo &II, Scope *S) { 7344 // Before we produce a declaration for an implicitly defined 7345 // function, see whether there was a locally-scoped declaration of 7346 // this name as a function or variable. If so, use that 7347 // (non-visible) declaration, and complain about it. 7348 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7349 = findLocallyScopedExternalDecl(&II); 7350 if (Pos != LocallyScopedExternalDecls.end()) { 7351 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7352 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7353 return Pos->second; 7354 } 7355 7356 // Extension in C99. Legal in C90, but warn about it. 7357 unsigned diag_id; 7358 if (II.getName().startswith("__builtin_")) 7359 diag_id = diag::warn_builtin_unknown; 7360 else if (getLangOptions().C99) 7361 diag_id = diag::ext_implicit_function_decl; 7362 else 7363 diag_id = diag::warn_implicit_function_decl; 7364 Diag(Loc, diag_id) << &II; 7365 7366 // Because typo correction is expensive, only do it if the implicit 7367 // function declaration is going to be treated as an error. 7368 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7369 TypoCorrection Corrected; 7370 DeclFilterCCC<FunctionDecl> Validator; 7371 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7372 LookupOrdinaryName, S, 0, Validator))) { 7373 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7374 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7375 FunctionDecl *Func = Corrected.getCorrectionDeclAs<FunctionDecl>(); 7376 7377 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7378 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7379 7380 if (Func->getLocation().isValid() 7381 && !II.getName().startswith("__builtin_")) 7382 Diag(Func->getLocation(), diag::note_previous_decl) 7383 << CorrectedQuotedStr; 7384 } 7385 } 7386 7387 // Set a Declarator for the implicit definition: int foo(); 7388 const char *Dummy; 7389 AttributeFactory attrFactory; 7390 DeclSpec DS(attrFactory); 7391 unsigned DiagID; 7392 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7393 (void)Error; // Silence warning. 7394 assert(!Error && "Error setting up implicit decl!"); 7395 Declarator D(DS, Declarator::BlockContext); 7396 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7397 0, 0, true, SourceLocation(), 7398 SourceLocation(), SourceLocation(), 7399 SourceLocation(), 7400 EST_None, SourceLocation(), 7401 0, 0, 0, 0, Loc, Loc, D), 7402 DS.getAttributes(), 7403 SourceLocation()); 7404 D.SetIdentifier(&II, Loc); 7405 7406 // Insert this function into translation-unit scope. 7407 7408 DeclContext *PrevDC = CurContext; 7409 CurContext = Context.getTranslationUnitDecl(); 7410 7411 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7412 FD->setImplicit(); 7413 7414 CurContext = PrevDC; 7415 7416 AddKnownFunctionAttributes(FD); 7417 7418 return FD; 7419} 7420 7421/// \brief Adds any function attributes that we know a priori based on 7422/// the declaration of this function. 7423/// 7424/// These attributes can apply both to implicitly-declared builtins 7425/// (like __builtin___printf_chk) or to library-declared functions 7426/// like NSLog or printf. 7427/// 7428/// We need to check for duplicate attributes both here and where user-written 7429/// attributes are applied to declarations. 7430void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7431 if (FD->isInvalidDecl()) 7432 return; 7433 7434 // If this is a built-in function, map its builtin attributes to 7435 // actual attributes. 7436 if (unsigned BuiltinID = FD->getBuiltinID()) { 7437 // Handle printf-formatting attributes. 7438 unsigned FormatIdx; 7439 bool HasVAListArg; 7440 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7441 if (!FD->getAttr<FormatAttr>()) { 7442 const char *fmt = "printf"; 7443 unsigned int NumParams = FD->getNumParams(); 7444 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf) 7445 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType()) 7446 fmt = "NSString"; 7447 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7448 fmt, FormatIdx+1, 7449 HasVAListArg ? 0 : FormatIdx+2)); 7450 } 7451 } 7452 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7453 HasVAListArg)) { 7454 if (!FD->getAttr<FormatAttr>()) 7455 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7456 "scanf", FormatIdx+1, 7457 HasVAListArg ? 0 : FormatIdx+2)); 7458 } 7459 7460 // Mark const if we don't care about errno and that is the only 7461 // thing preventing the function from being const. This allows 7462 // IRgen to use LLVM intrinsics for such functions. 7463 if (!getLangOptions().MathErrno && 7464 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7465 if (!FD->getAttr<ConstAttr>()) 7466 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7467 } 7468 7469 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7470 !FD->getAttr<ReturnsTwiceAttr>()) 7471 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7472 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7473 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7474 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7475 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7476 } 7477 7478 IdentifierInfo *Name = FD->getIdentifier(); 7479 if (!Name) 7480 return; 7481 if ((!getLangOptions().CPlusPlus && 7482 FD->getDeclContext()->isTranslationUnit()) || 7483 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7484 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7485 LinkageSpecDecl::lang_c)) { 7486 // Okay: this could be a libc/libm/Objective-C function we know 7487 // about. 7488 } else 7489 return; 7490 7491 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7492 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7493 // target-specific builtins, perhaps? 7494 if (!FD->getAttr<FormatAttr>()) 7495 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7496 "printf", 2, 7497 Name->isStr("vasprintf") ? 0 : 3)); 7498 } 7499} 7500 7501TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7502 TypeSourceInfo *TInfo) { 7503 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7504 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7505 7506 if (!TInfo) { 7507 assert(D.isInvalidType() && "no declarator info for valid type"); 7508 TInfo = Context.getTrivialTypeSourceInfo(T); 7509 } 7510 7511 // Scope manipulation handled by caller. 7512 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7513 D.getSourceRange().getBegin(), 7514 D.getIdentifierLoc(), 7515 D.getIdentifier(), 7516 TInfo); 7517 7518 // Bail out immediately if we have an invalid declaration. 7519 if (D.isInvalidType()) { 7520 NewTD->setInvalidDecl(); 7521 return NewTD; 7522 } 7523 7524 if (D.getDeclSpec().isModulePrivateSpecified()) { 7525 if (CurContext->isFunctionOrMethod()) 7526 Diag(NewTD->getLocation(), diag::err_module_private_local) 7527 << 2 << NewTD->getDeclName() 7528 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7529 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7530 else 7531 NewTD->setModulePrivate(); 7532 } 7533 7534 // C++ [dcl.typedef]p8: 7535 // If the typedef declaration defines an unnamed class (or 7536 // enum), the first typedef-name declared by the declaration 7537 // to be that class type (or enum type) is used to denote the 7538 // class type (or enum type) for linkage purposes only. 7539 // We need to check whether the type was declared in the declaration. 7540 switch (D.getDeclSpec().getTypeSpecType()) { 7541 case TST_enum: 7542 case TST_struct: 7543 case TST_union: 7544 case TST_class: { 7545 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7546 7547 // Do nothing if the tag is not anonymous or already has an 7548 // associated typedef (from an earlier typedef in this decl group). 7549 if (tagFromDeclSpec->getIdentifier()) break; 7550 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7551 7552 // A well-formed anonymous tag must always be a TUK_Definition. 7553 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7554 7555 // The type must match the tag exactly; no qualifiers allowed. 7556 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7557 break; 7558 7559 // Otherwise, set this is the anon-decl typedef for the tag. 7560 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7561 break; 7562 } 7563 7564 default: 7565 break; 7566 } 7567 7568 return NewTD; 7569} 7570 7571 7572/// \brief Determine whether a tag with a given kind is acceptable 7573/// as a redeclaration of the given tag declaration. 7574/// 7575/// \returns true if the new tag kind is acceptable, false otherwise. 7576bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7577 TagTypeKind NewTag, bool isDefinition, 7578 SourceLocation NewTagLoc, 7579 const IdentifierInfo &Name) { 7580 // C++ [dcl.type.elab]p3: 7581 // The class-key or enum keyword present in the 7582 // elaborated-type-specifier shall agree in kind with the 7583 // declaration to which the name in the elaborated-type-specifier 7584 // refers. This rule also applies to the form of 7585 // elaborated-type-specifier that declares a class-name or 7586 // friend class since it can be construed as referring to the 7587 // definition of the class. Thus, in any 7588 // elaborated-type-specifier, the enum keyword shall be used to 7589 // refer to an enumeration (7.2), the union class-key shall be 7590 // used to refer to a union (clause 9), and either the class or 7591 // struct class-key shall be used to refer to a class (clause 9) 7592 // declared using the class or struct class-key. 7593 TagTypeKind OldTag = Previous->getTagKind(); 7594 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7595 if (OldTag == NewTag) 7596 return true; 7597 7598 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7599 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7600 // Warn about the struct/class tag mismatch. 7601 bool isTemplate = false; 7602 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7603 isTemplate = Record->getDescribedClassTemplate(); 7604 7605 if (!ActiveTemplateInstantiations.empty()) { 7606 // In a template instantiation, do not offer fix-its for tag mismatches 7607 // since they usually mess up the template instead of fixing the problem. 7608 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7609 << (NewTag == TTK_Class) << isTemplate << &Name; 7610 return true; 7611 } 7612 7613 if (isDefinition) { 7614 // On definitions, check previous tags and issue a fix-it for each 7615 // one that doesn't match the current tag. 7616 if (Previous->getDefinition()) { 7617 // Don't suggest fix-its for redefinitions. 7618 return true; 7619 } 7620 7621 bool previousMismatch = false; 7622 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7623 E(Previous->redecls_end()); I != E; ++I) { 7624 if (I->getTagKind() != NewTag) { 7625 if (!previousMismatch) { 7626 previousMismatch = true; 7627 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7628 << (NewTag == TTK_Class) << isTemplate << &Name; 7629 } 7630 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7631 << (NewTag == TTK_Class) 7632 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7633 NewTag == TTK_Class? 7634 "class" : "struct"); 7635 } 7636 } 7637 return true; 7638 } 7639 7640 // Check for a previous definition. If current tag and definition 7641 // are same type, do nothing. If no definition, but disagree with 7642 // with previous tag type, give a warning, but no fix-it. 7643 const TagDecl *Redecl = Previous->getDefinition() ? 7644 Previous->getDefinition() : Previous; 7645 if (Redecl->getTagKind() == NewTag) { 7646 return true; 7647 } 7648 7649 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7650 << (NewTag == TTK_Class) 7651 << isTemplate << &Name; 7652 Diag(Redecl->getLocation(), diag::note_previous_use); 7653 7654 // If there is a previous defintion, suggest a fix-it. 7655 if (Previous->getDefinition()) { 7656 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7657 << (Redecl->getTagKind() == TTK_Class) 7658 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7659 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7660 } 7661 7662 return true; 7663 } 7664 return false; 7665} 7666 7667/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7668/// former case, Name will be non-null. In the later case, Name will be null. 7669/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7670/// reference/declaration/definition of a tag. 7671Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7672 SourceLocation KWLoc, CXXScopeSpec &SS, 7673 IdentifierInfo *Name, SourceLocation NameLoc, 7674 AttributeList *Attr, AccessSpecifier AS, 7675 SourceLocation ModulePrivateLoc, 7676 MultiTemplateParamsArg TemplateParameterLists, 7677 bool &OwnedDecl, bool &IsDependent, 7678 SourceLocation ScopedEnumKWLoc, 7679 bool ScopedEnumUsesClassTag, 7680 TypeResult UnderlyingType) { 7681 // If this is not a definition, it must have a name. 7682 assert((Name != 0 || TUK == TUK_Definition) && 7683 "Nameless record must be a definition!"); 7684 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7685 7686 OwnedDecl = false; 7687 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7688 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7689 7690 // FIXME: Check explicit specializations more carefully. 7691 bool isExplicitSpecialization = false; 7692 bool Invalid = false; 7693 7694 // We only need to do this matching if we have template parameters 7695 // or a scope specifier, which also conveniently avoids this work 7696 // for non-C++ cases. 7697 if (TemplateParameterLists.size() > 0 || 7698 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7699 if (TemplateParameterList *TemplateParams 7700 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7701 TemplateParameterLists.get(), 7702 TemplateParameterLists.size(), 7703 TUK == TUK_Friend, 7704 isExplicitSpecialization, 7705 Invalid)) { 7706 if (TemplateParams->size() > 0) { 7707 // This is a declaration or definition of a class template (which may 7708 // be a member of another template). 7709 7710 if (Invalid) 7711 return 0; 7712 7713 OwnedDecl = false; 7714 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7715 SS, Name, NameLoc, Attr, 7716 TemplateParams, AS, 7717 ModulePrivateLoc, 7718 TemplateParameterLists.size() - 1, 7719 (TemplateParameterList**) TemplateParameterLists.release()); 7720 return Result.get(); 7721 } else { 7722 // The "template<>" header is extraneous. 7723 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7724 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7725 isExplicitSpecialization = true; 7726 } 7727 } 7728 } 7729 7730 // Figure out the underlying type if this a enum declaration. We need to do 7731 // this early, because it's needed to detect if this is an incompatible 7732 // redeclaration. 7733 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7734 7735 if (Kind == TTK_Enum) { 7736 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7737 // No underlying type explicitly specified, or we failed to parse the 7738 // type, default to int. 7739 EnumUnderlying = Context.IntTy.getTypePtr(); 7740 else if (UnderlyingType.get()) { 7741 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7742 // integral type; any cv-qualification is ignored. 7743 TypeSourceInfo *TI = 0; 7744 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7745 EnumUnderlying = TI; 7746 7747 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7748 7749 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7750 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7751 << T; 7752 // Recover by falling back to int. 7753 EnumUnderlying = Context.IntTy.getTypePtr(); 7754 } 7755 7756 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7757 UPPC_FixedUnderlyingType)) 7758 EnumUnderlying = Context.IntTy.getTypePtr(); 7759 7760 } else if (getLangOptions().MicrosoftExt) 7761 // Microsoft enums are always of int type. 7762 EnumUnderlying = Context.IntTy.getTypePtr(); 7763 } 7764 7765 DeclContext *SearchDC = CurContext; 7766 DeclContext *DC = CurContext; 7767 bool isStdBadAlloc = false; 7768 7769 RedeclarationKind Redecl = ForRedeclaration; 7770 if (TUK == TUK_Friend || TUK == TUK_Reference) 7771 Redecl = NotForRedeclaration; 7772 7773 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7774 7775 if (Name && SS.isNotEmpty()) { 7776 // We have a nested-name tag ('struct foo::bar'). 7777 7778 // Check for invalid 'foo::'. 7779 if (SS.isInvalid()) { 7780 Name = 0; 7781 goto CreateNewDecl; 7782 } 7783 7784 // If this is a friend or a reference to a class in a dependent 7785 // context, don't try to make a decl for it. 7786 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7787 DC = computeDeclContext(SS, false); 7788 if (!DC) { 7789 IsDependent = true; 7790 return 0; 7791 } 7792 } else { 7793 DC = computeDeclContext(SS, true); 7794 if (!DC) { 7795 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7796 << SS.getRange(); 7797 return 0; 7798 } 7799 } 7800 7801 if (RequireCompleteDeclContext(SS, DC)) 7802 return 0; 7803 7804 SearchDC = DC; 7805 // Look-up name inside 'foo::'. 7806 LookupQualifiedName(Previous, DC); 7807 7808 if (Previous.isAmbiguous()) 7809 return 0; 7810 7811 if (Previous.empty()) { 7812 // Name lookup did not find anything. However, if the 7813 // nested-name-specifier refers to the current instantiation, 7814 // and that current instantiation has any dependent base 7815 // classes, we might find something at instantiation time: treat 7816 // this as a dependent elaborated-type-specifier. 7817 // But this only makes any sense for reference-like lookups. 7818 if (Previous.wasNotFoundInCurrentInstantiation() && 7819 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7820 IsDependent = true; 7821 return 0; 7822 } 7823 7824 // A tag 'foo::bar' must already exist. 7825 Diag(NameLoc, diag::err_not_tag_in_scope) 7826 << Kind << Name << DC << SS.getRange(); 7827 Name = 0; 7828 Invalid = true; 7829 goto CreateNewDecl; 7830 } 7831 } else if (Name) { 7832 // If this is a named struct, check to see if there was a previous forward 7833 // declaration or definition. 7834 // FIXME: We're looking into outer scopes here, even when we 7835 // shouldn't be. Doing so can result in ambiguities that we 7836 // shouldn't be diagnosing. 7837 LookupName(Previous, S); 7838 7839 if (Previous.isAmbiguous() && 7840 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7841 LookupResult::Filter F = Previous.makeFilter(); 7842 while (F.hasNext()) { 7843 NamedDecl *ND = F.next(); 7844 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7845 F.erase(); 7846 } 7847 F.done(); 7848 } 7849 7850 // Note: there used to be some attempt at recovery here. 7851 if (Previous.isAmbiguous()) 7852 return 0; 7853 7854 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7855 // FIXME: This makes sure that we ignore the contexts associated 7856 // with C structs, unions, and enums when looking for a matching 7857 // tag declaration or definition. See the similar lookup tweak 7858 // in Sema::LookupName; is there a better way to deal with this? 7859 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7860 SearchDC = SearchDC->getParent(); 7861 } 7862 } else if (S->isFunctionPrototypeScope()) { 7863 // If this is an enum declaration in function prototype scope, set its 7864 // initial context to the translation unit. 7865 SearchDC = Context.getTranslationUnitDecl(); 7866 } 7867 7868 if (Previous.isSingleResult() && 7869 Previous.getFoundDecl()->isTemplateParameter()) { 7870 // Maybe we will complain about the shadowed template parameter. 7871 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7872 // Just pretend that we didn't see the previous declaration. 7873 Previous.clear(); 7874 } 7875 7876 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7877 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7878 // This is a declaration of or a reference to "std::bad_alloc". 7879 isStdBadAlloc = true; 7880 7881 if (Previous.empty() && StdBadAlloc) { 7882 // std::bad_alloc has been implicitly declared (but made invisible to 7883 // name lookup). Fill in this implicit declaration as the previous 7884 // declaration, so that the declarations get chained appropriately. 7885 Previous.addDecl(getStdBadAlloc()); 7886 } 7887 } 7888 7889 // If we didn't find a previous declaration, and this is a reference 7890 // (or friend reference), move to the correct scope. In C++, we 7891 // also need to do a redeclaration lookup there, just in case 7892 // there's a shadow friend decl. 7893 if (Name && Previous.empty() && 7894 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7895 if (Invalid) goto CreateNewDecl; 7896 assert(SS.isEmpty()); 7897 7898 if (TUK == TUK_Reference) { 7899 // C++ [basic.scope.pdecl]p5: 7900 // -- for an elaborated-type-specifier of the form 7901 // 7902 // class-key identifier 7903 // 7904 // if the elaborated-type-specifier is used in the 7905 // decl-specifier-seq or parameter-declaration-clause of a 7906 // function defined in namespace scope, the identifier is 7907 // declared as a class-name in the namespace that contains 7908 // the declaration; otherwise, except as a friend 7909 // declaration, the identifier is declared in the smallest 7910 // non-class, non-function-prototype scope that contains the 7911 // declaration. 7912 // 7913 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7914 // C structs and unions. 7915 // 7916 // It is an error in C++ to declare (rather than define) an enum 7917 // type, including via an elaborated type specifier. We'll 7918 // diagnose that later; for now, declare the enum in the same 7919 // scope as we would have picked for any other tag type. 7920 // 7921 // GNU C also supports this behavior as part of its incomplete 7922 // enum types extension, while GNU C++ does not. 7923 // 7924 // Find the context where we'll be declaring the tag. 7925 // FIXME: We would like to maintain the current DeclContext as the 7926 // lexical context, 7927 while (SearchDC->isRecord() || SearchDC->isTransparentContext() || 7928 SearchDC->isObjCContainer()) 7929 SearchDC = SearchDC->getParent(); 7930 7931 // Find the scope where we'll be declaring the tag. 7932 while (S->isClassScope() || 7933 (getLangOptions().CPlusPlus && 7934 S->isFunctionPrototypeScope()) || 7935 ((S->getFlags() & Scope::DeclScope) == 0) || 7936 (S->getEntity() && 7937 ((DeclContext *)S->getEntity())->isTransparentContext())) 7938 S = S->getParent(); 7939 } else { 7940 assert(TUK == TUK_Friend); 7941 // C++ [namespace.memdef]p3: 7942 // If a friend declaration in a non-local class first declares a 7943 // class or function, the friend class or function is a member of 7944 // the innermost enclosing namespace. 7945 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7946 } 7947 7948 // In C++, we need to do a redeclaration lookup to properly 7949 // diagnose some problems. 7950 if (getLangOptions().CPlusPlus) { 7951 Previous.setRedeclarationKind(ForRedeclaration); 7952 LookupQualifiedName(Previous, SearchDC); 7953 } 7954 } 7955 7956 if (!Previous.empty()) { 7957 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7958 7959 // It's okay to have a tag decl in the same scope as a typedef 7960 // which hides a tag decl in the same scope. Finding this 7961 // insanity with a redeclaration lookup can only actually happen 7962 // in C++. 7963 // 7964 // This is also okay for elaborated-type-specifiers, which is 7965 // technically forbidden by the current standard but which is 7966 // okay according to the likely resolution of an open issue; 7967 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7968 if (getLangOptions().CPlusPlus) { 7969 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7970 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7971 TagDecl *Tag = TT->getDecl(); 7972 if (Tag->getDeclName() == Name && 7973 Tag->getDeclContext()->getRedeclContext() 7974 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7975 PrevDecl = Tag; 7976 Previous.clear(); 7977 Previous.addDecl(Tag); 7978 Previous.resolveKind(); 7979 } 7980 } 7981 } 7982 } 7983 7984 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7985 // If this is a use of a previous tag, or if the tag is already declared 7986 // in the same scope (so that the definition/declaration completes or 7987 // rementions the tag), reuse the decl. 7988 if (TUK == TUK_Reference || TUK == TUK_Friend || 7989 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7990 // Make sure that this wasn't declared as an enum and now used as a 7991 // struct or something similar. 7992 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7993 TUK == TUK_Definition, KWLoc, 7994 *Name)) { 7995 bool SafeToContinue 7996 = (PrevTagDecl->getTagKind() != TTK_Enum && 7997 Kind != TTK_Enum); 7998 if (SafeToContinue) 7999 Diag(KWLoc, diag::err_use_with_wrong_tag) 8000 << Name 8001 << FixItHint::CreateReplacement(SourceRange(KWLoc), 8002 PrevTagDecl->getKindName()); 8003 else 8004 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 8005 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8006 8007 if (SafeToContinue) 8008 Kind = PrevTagDecl->getTagKind(); 8009 else { 8010 // Recover by making this an anonymous redefinition. 8011 Name = 0; 8012 Previous.clear(); 8013 Invalid = true; 8014 } 8015 } 8016 8017 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 8018 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 8019 8020 // If this is an elaborated-type-specifier for a scoped enumeration, 8021 // the 'class' keyword is not necessary and not permitted. 8022 if (TUK == TUK_Reference || TUK == TUK_Friend) { 8023 if (ScopedEnum) 8024 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 8025 << PrevEnum->isScoped() 8026 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 8027 return PrevTagDecl; 8028 } 8029 8030 // All conflicts with previous declarations are recovered by 8031 // returning the previous declaration. 8032 if (ScopedEnum != PrevEnum->isScoped()) { 8033 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 8034 << PrevEnum->isScoped(); 8035 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8036 return PrevTagDecl; 8037 } 8038 else if (EnumUnderlying && PrevEnum->isFixed()) { 8039 QualType T; 8040 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8041 T = TI->getType(); 8042 else 8043 T = QualType(EnumUnderlying.get<const Type*>(), 0); 8044 8045 if (!Context.hasSameUnqualifiedType(T, 8046 PrevEnum->getIntegerType())) { 8047 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 8048 diag::err_enum_redeclare_type_mismatch) 8049 << T 8050 << PrevEnum->getIntegerType(); 8051 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8052 return PrevTagDecl; 8053 } 8054 } 8055 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8056 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8057 << PrevEnum->isFixed(); 8058 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8059 return PrevTagDecl; 8060 } 8061 } 8062 8063 if (!Invalid) { 8064 // If this is a use, just return the declaration we found. 8065 8066 // FIXME: In the future, return a variant or some other clue 8067 // for the consumer of this Decl to know it doesn't own it. 8068 // For our current ASTs this shouldn't be a problem, but will 8069 // need to be changed with DeclGroups. 8070 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8071 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 8072 return PrevTagDecl; 8073 8074 // Diagnose attempts to redefine a tag. 8075 if (TUK == TUK_Definition) { 8076 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8077 // If we're defining a specialization and the previous definition 8078 // is from an implicit instantiation, don't emit an error 8079 // here; we'll catch this in the general case below. 8080 if (!isExplicitSpecialization || 8081 !isa<CXXRecordDecl>(Def) || 8082 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8083 == TSK_ExplicitSpecialization) { 8084 Diag(NameLoc, diag::err_redefinition) << Name; 8085 Diag(Def->getLocation(), diag::note_previous_definition); 8086 // If this is a redefinition, recover by making this 8087 // struct be anonymous, which will make any later 8088 // references get the previous definition. 8089 Name = 0; 8090 Previous.clear(); 8091 Invalid = true; 8092 } 8093 } else { 8094 // If the type is currently being defined, complain 8095 // about a nested redefinition. 8096 const TagType *Tag 8097 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8098 if (Tag->isBeingDefined()) { 8099 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8100 Diag(PrevTagDecl->getLocation(), 8101 diag::note_previous_definition); 8102 Name = 0; 8103 Previous.clear(); 8104 Invalid = true; 8105 } 8106 } 8107 8108 // Okay, this is definition of a previously declared or referenced 8109 // tag PrevDecl. We're going to create a new Decl for it. 8110 } 8111 } 8112 // If we get here we have (another) forward declaration or we 8113 // have a definition. Just create a new decl. 8114 8115 } else { 8116 // If we get here, this is a definition of a new tag type in a nested 8117 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8118 // new decl/type. We set PrevDecl to NULL so that the entities 8119 // have distinct types. 8120 Previous.clear(); 8121 } 8122 // If we get here, we're going to create a new Decl. If PrevDecl 8123 // is non-NULL, it's a definition of the tag declared by 8124 // PrevDecl. If it's NULL, we have a new definition. 8125 8126 8127 // Otherwise, PrevDecl is not a tag, but was found with tag 8128 // lookup. This is only actually possible in C++, where a few 8129 // things like templates still live in the tag namespace. 8130 } else { 8131 // Use a better diagnostic if an elaborated-type-specifier 8132 // found the wrong kind of type on the first 8133 // (non-redeclaration) lookup. 8134 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8135 !Previous.isForRedeclaration()) { 8136 unsigned Kind = 0; 8137 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8138 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8139 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8140 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8141 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8142 Invalid = true; 8143 8144 // Otherwise, only diagnose if the declaration is in scope. 8145 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8146 isExplicitSpecialization)) { 8147 // do nothing 8148 8149 // Diagnose implicit declarations introduced by elaborated types. 8150 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8151 unsigned Kind = 0; 8152 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8153 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8154 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8155 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8156 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8157 Invalid = true; 8158 8159 // Otherwise it's a declaration. Call out a particularly common 8160 // case here. 8161 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8162 unsigned Kind = 0; 8163 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8164 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8165 << Name << Kind << TND->getUnderlyingType(); 8166 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8167 Invalid = true; 8168 8169 // Otherwise, diagnose. 8170 } else { 8171 // The tag name clashes with something else in the target scope, 8172 // issue an error and recover by making this tag be anonymous. 8173 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8174 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8175 Name = 0; 8176 Invalid = true; 8177 } 8178 8179 // The existing declaration isn't relevant to us; we're in a 8180 // new scope, so clear out the previous declaration. 8181 Previous.clear(); 8182 } 8183 } 8184 8185CreateNewDecl: 8186 8187 TagDecl *PrevDecl = 0; 8188 if (Previous.isSingleResult()) 8189 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8190 8191 // If there is an identifier, use the location of the identifier as the 8192 // location of the decl, otherwise use the location of the struct/union 8193 // keyword. 8194 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8195 8196 // Otherwise, create a new declaration. If there is a previous 8197 // declaration of the same entity, the two will be linked via 8198 // PrevDecl. 8199 TagDecl *New; 8200 8201 bool IsForwardReference = false; 8202 if (Kind == TTK_Enum) { 8203 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8204 // enum X { A, B, C } D; D should chain to X. 8205 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8206 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8207 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8208 // If this is an undefined enum, warn. 8209 if (TUK != TUK_Definition && !Invalid) { 8210 TagDecl *Def; 8211 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8212 // C++0x: 7.2p2: opaque-enum-declaration. 8213 // Conflicts are diagnosed above. Do nothing. 8214 } 8215 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8216 Diag(Loc, diag::ext_forward_ref_enum_def) 8217 << New; 8218 Diag(Def->getLocation(), diag::note_previous_definition); 8219 } else { 8220 unsigned DiagID = diag::ext_forward_ref_enum; 8221 if (getLangOptions().MicrosoftExt) 8222 DiagID = diag::ext_ms_forward_ref_enum; 8223 else if (getLangOptions().CPlusPlus) 8224 DiagID = diag::err_forward_ref_enum; 8225 Diag(Loc, DiagID); 8226 8227 // If this is a forward-declared reference to an enumeration, make a 8228 // note of it; we won't actually be introducing the declaration into 8229 // the declaration context. 8230 if (TUK == TUK_Reference) 8231 IsForwardReference = true; 8232 } 8233 } 8234 8235 if (EnumUnderlying) { 8236 EnumDecl *ED = cast<EnumDecl>(New); 8237 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8238 ED->setIntegerTypeSourceInfo(TI); 8239 else 8240 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8241 ED->setPromotionType(ED->getIntegerType()); 8242 } 8243 8244 } else { 8245 // struct/union/class 8246 8247 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8248 // struct X { int A; } D; D should chain to X. 8249 if (getLangOptions().CPlusPlus) { 8250 // FIXME: Look for a way to use RecordDecl for simple structs. 8251 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8252 cast_or_null<CXXRecordDecl>(PrevDecl)); 8253 8254 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8255 StdBadAlloc = cast<CXXRecordDecl>(New); 8256 } else 8257 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8258 cast_or_null<RecordDecl>(PrevDecl)); 8259 } 8260 8261 // Maybe add qualifier info. 8262 if (SS.isNotEmpty()) { 8263 if (SS.isSet()) { 8264 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8265 if (TemplateParameterLists.size() > 0) { 8266 New->setTemplateParameterListsInfo(Context, 8267 TemplateParameterLists.size(), 8268 (TemplateParameterList**) TemplateParameterLists.release()); 8269 } 8270 } 8271 else 8272 Invalid = true; 8273 } 8274 8275 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8276 // Add alignment attributes if necessary; these attributes are checked when 8277 // the ASTContext lays out the structure. 8278 // 8279 // It is important for implementing the correct semantics that this 8280 // happen here (in act on tag decl). The #pragma pack stack is 8281 // maintained as a result of parser callbacks which can occur at 8282 // many points during the parsing of a struct declaration (because 8283 // the #pragma tokens are effectively skipped over during the 8284 // parsing of the struct). 8285 AddAlignmentAttributesForRecord(RD); 8286 8287 AddMsStructLayoutForRecord(RD); 8288 } 8289 8290 if (ModulePrivateLoc.isValid()) { 8291 if (isExplicitSpecialization) 8292 Diag(New->getLocation(), diag::err_module_private_specialization) 8293 << 2 8294 << FixItHint::CreateRemoval(ModulePrivateLoc); 8295 // __module_private__ does not apply to local classes. However, we only 8296 // diagnose this as an error when the declaration specifiers are 8297 // freestanding. Here, we just ignore the __module_private__. 8298 else if (!SearchDC->isFunctionOrMethod()) 8299 New->setModulePrivate(); 8300 } 8301 8302 // If this is a specialization of a member class (of a class template), 8303 // check the specialization. 8304 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8305 Invalid = true; 8306 8307 if (Invalid) 8308 New->setInvalidDecl(); 8309 8310 if (Attr) 8311 ProcessDeclAttributeList(S, New, Attr); 8312 8313 // If we're declaring or defining a tag in function prototype scope 8314 // in C, note that this type can only be used within the function. 8315 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8316 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8317 8318 // Set the lexical context. If the tag has a C++ scope specifier, the 8319 // lexical context will be different from the semantic context. 8320 New->setLexicalDeclContext(CurContext); 8321 8322 // Mark this as a friend decl if applicable. 8323 // In Microsoft mode, a friend declaration also acts as a forward 8324 // declaration so we always pass true to setObjectOfFriendDecl to make 8325 // the tag name visible. 8326 if (TUK == TUK_Friend) 8327 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8328 getLangOptions().MicrosoftExt); 8329 8330 // Set the access specifier. 8331 if (!Invalid && SearchDC->isRecord()) 8332 SetMemberAccessSpecifier(New, PrevDecl, AS); 8333 8334 if (TUK == TUK_Definition) 8335 New->startDefinition(); 8336 8337 // If this has an identifier, add it to the scope stack. 8338 if (TUK == TUK_Friend) { 8339 // We might be replacing an existing declaration in the lookup tables; 8340 // if so, borrow its access specifier. 8341 if (PrevDecl) 8342 New->setAccess(PrevDecl->getAccess()); 8343 8344 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8345 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8346 if (Name) // can be null along some error paths 8347 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8348 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8349 } else if (Name) { 8350 S = getNonFieldDeclScope(S); 8351 PushOnScopeChains(New, S, !IsForwardReference); 8352 if (IsForwardReference) 8353 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8354 8355 } else { 8356 CurContext->addDecl(New); 8357 } 8358 8359 // If this is the C FILE type, notify the AST context. 8360 if (IdentifierInfo *II = New->getIdentifier()) 8361 if (!New->isInvalidDecl() && 8362 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8363 II->isStr("FILE")) 8364 Context.setFILEDecl(New); 8365 8366 OwnedDecl = true; 8367 return New; 8368} 8369 8370void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8371 AdjustDeclIfTemplate(TagD); 8372 TagDecl *Tag = cast<TagDecl>(TagD); 8373 8374 // Enter the tag context. 8375 PushDeclContext(S, Tag); 8376} 8377 8378Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8379 assert(isa<ObjCContainerDecl>(IDecl) && 8380 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8381 DeclContext *OCD = cast<DeclContext>(IDecl); 8382 assert(getContainingDC(OCD) == CurContext && 8383 "The next DeclContext should be lexically contained in the current one."); 8384 CurContext = OCD; 8385 return IDecl; 8386} 8387 8388void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8389 SourceLocation FinalLoc, 8390 SourceLocation LBraceLoc) { 8391 AdjustDeclIfTemplate(TagD); 8392 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8393 8394 FieldCollector->StartClass(); 8395 8396 if (!Record->getIdentifier()) 8397 return; 8398 8399 if (FinalLoc.isValid()) 8400 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8401 8402 // C++ [class]p2: 8403 // [...] The class-name is also inserted into the scope of the 8404 // class itself; this is known as the injected-class-name. For 8405 // purposes of access checking, the injected-class-name is treated 8406 // as if it were a public member name. 8407 CXXRecordDecl *InjectedClassName 8408 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8409 Record->getLocStart(), Record->getLocation(), 8410 Record->getIdentifier(), 8411 /*PrevDecl=*/0, 8412 /*DelayTypeCreation=*/true); 8413 Context.getTypeDeclType(InjectedClassName, Record); 8414 InjectedClassName->setImplicit(); 8415 InjectedClassName->setAccess(AS_public); 8416 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8417 InjectedClassName->setDescribedClassTemplate(Template); 8418 PushOnScopeChains(InjectedClassName, S); 8419 assert(InjectedClassName->isInjectedClassName() && 8420 "Broken injected-class-name"); 8421} 8422 8423void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8424 SourceLocation RBraceLoc) { 8425 AdjustDeclIfTemplate(TagD); 8426 TagDecl *Tag = cast<TagDecl>(TagD); 8427 Tag->setRBraceLoc(RBraceLoc); 8428 8429 if (isa<CXXRecordDecl>(Tag)) 8430 FieldCollector->FinishClass(); 8431 8432 // Exit this scope of this tag's definition. 8433 PopDeclContext(); 8434 8435 // Notify the consumer that we've defined a tag. 8436 Consumer.HandleTagDeclDefinition(Tag); 8437} 8438 8439void Sema::ActOnObjCContainerFinishDefinition() { 8440 // Exit this scope of this interface definition. 8441 PopDeclContext(); 8442} 8443 8444void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8445 assert(DC == CurContext && "Mismatch of container contexts"); 8446 OriginalLexicalContext = DC; 8447 ActOnObjCContainerFinishDefinition(); 8448} 8449 8450void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8451 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8452 OriginalLexicalContext = 0; 8453} 8454 8455void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8456 AdjustDeclIfTemplate(TagD); 8457 TagDecl *Tag = cast<TagDecl>(TagD); 8458 Tag->setInvalidDecl(); 8459 8460 // We're undoing ActOnTagStartDefinition here, not 8461 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8462 // the FieldCollector. 8463 8464 PopDeclContext(); 8465} 8466 8467// Note that FieldName may be null for anonymous bitfields. 8468ExprResult Sema::VerifyBitField(SourceLocation FieldLoc, 8469 IdentifierInfo *FieldName, 8470 QualType FieldTy, Expr *BitWidth, 8471 bool *ZeroWidth) { 8472 // Default to true; that shouldn't confuse checks for emptiness 8473 if (ZeroWidth) 8474 *ZeroWidth = true; 8475 8476 // C99 6.7.2.1p4 - verify the field type. 8477 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8478 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8479 // Handle incomplete types with specific error. 8480 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8481 return ExprError(); 8482 if (FieldName) 8483 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8484 << FieldName << FieldTy << BitWidth->getSourceRange(); 8485 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8486 << FieldTy << BitWidth->getSourceRange(); 8487 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8488 UPPC_BitFieldWidth)) 8489 return ExprError(); 8490 8491 // If the bit-width is type- or value-dependent, don't try to check 8492 // it now. 8493 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8494 return Owned(BitWidth); 8495 8496 llvm::APSInt Value; 8497 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value); 8498 if (ICE.isInvalid()) 8499 return ICE; 8500 BitWidth = ICE.take(); 8501 8502 if (Value != 0 && ZeroWidth) 8503 *ZeroWidth = false; 8504 8505 // Zero-width bitfield is ok for anonymous field. 8506 if (Value == 0 && FieldName) 8507 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8508 8509 if (Value.isSigned() && Value.isNegative()) { 8510 if (FieldName) 8511 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8512 << FieldName << Value.toString(10); 8513 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8514 << Value.toString(10); 8515 } 8516 8517 if (!FieldTy->isDependentType()) { 8518 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8519 if (Value.getZExtValue() > TypeSize) { 8520 if (!getLangOptions().CPlusPlus) { 8521 if (FieldName) 8522 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8523 << FieldName << (unsigned)Value.getZExtValue() 8524 << (unsigned)TypeSize; 8525 8526 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8527 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8528 } 8529 8530 if (FieldName) 8531 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8532 << FieldName << (unsigned)Value.getZExtValue() 8533 << (unsigned)TypeSize; 8534 else 8535 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8536 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8537 } 8538 } 8539 8540 return Owned(BitWidth); 8541} 8542 8543/// ActOnField - Each field of a C struct/union is passed into this in order 8544/// to create a FieldDecl object for it. 8545Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8546 Declarator &D, Expr *BitfieldWidth) { 8547 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8548 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8549 /*HasInit=*/false, AS_public); 8550 return Res; 8551} 8552 8553/// HandleField - Analyze a field of a C struct or a C++ data member. 8554/// 8555FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8556 SourceLocation DeclStart, 8557 Declarator &D, Expr *BitWidth, bool HasInit, 8558 AccessSpecifier AS) { 8559 IdentifierInfo *II = D.getIdentifier(); 8560 SourceLocation Loc = DeclStart; 8561 if (II) Loc = D.getIdentifierLoc(); 8562 8563 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8564 QualType T = TInfo->getType(); 8565 if (getLangOptions().CPlusPlus) { 8566 CheckExtraCXXDefaultArguments(D); 8567 8568 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8569 UPPC_DataMemberType)) { 8570 D.setInvalidType(); 8571 T = Context.IntTy; 8572 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8573 } 8574 } 8575 8576 DiagnoseFunctionSpecifiers(D); 8577 8578 if (D.getDeclSpec().isThreadSpecified()) 8579 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8580 if (D.getDeclSpec().isConstexprSpecified()) 8581 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8582 << 2; 8583 8584 // Check to see if this name was declared as a member previously 8585 NamedDecl *PrevDecl = 0; 8586 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8587 LookupName(Previous, S); 8588 switch (Previous.getResultKind()) { 8589 case LookupResult::Found: 8590 case LookupResult::FoundUnresolvedValue: 8591 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8592 break; 8593 8594 case LookupResult::FoundOverloaded: 8595 PrevDecl = Previous.getRepresentativeDecl(); 8596 break; 8597 8598 case LookupResult::NotFound: 8599 case LookupResult::NotFoundInCurrentInstantiation: 8600 case LookupResult::Ambiguous: 8601 break; 8602 } 8603 Previous.suppressDiagnostics(); 8604 8605 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8606 // Maybe we will complain about the shadowed template parameter. 8607 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8608 // Just pretend that we didn't see the previous declaration. 8609 PrevDecl = 0; 8610 } 8611 8612 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8613 PrevDecl = 0; 8614 8615 bool Mutable 8616 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8617 SourceLocation TSSL = D.getSourceRange().getBegin(); 8618 FieldDecl *NewFD 8619 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8620 TSSL, AS, PrevDecl, &D); 8621 8622 if (NewFD->isInvalidDecl()) 8623 Record->setInvalidDecl(); 8624 8625 if (D.getDeclSpec().isModulePrivateSpecified()) 8626 NewFD->setModulePrivate(); 8627 8628 if (NewFD->isInvalidDecl() && PrevDecl) { 8629 // Don't introduce NewFD into scope; there's already something 8630 // with the same name in the same scope. 8631 } else if (II) { 8632 PushOnScopeChains(NewFD, S); 8633 } else 8634 Record->addDecl(NewFD); 8635 8636 return NewFD; 8637} 8638 8639/// \brief Build a new FieldDecl and check its well-formedness. 8640/// 8641/// This routine builds a new FieldDecl given the fields name, type, 8642/// record, etc. \p PrevDecl should refer to any previous declaration 8643/// with the same name and in the same scope as the field to be 8644/// created. 8645/// 8646/// \returns a new FieldDecl. 8647/// 8648/// \todo The Declarator argument is a hack. It will be removed once 8649FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8650 TypeSourceInfo *TInfo, 8651 RecordDecl *Record, SourceLocation Loc, 8652 bool Mutable, Expr *BitWidth, bool HasInit, 8653 SourceLocation TSSL, 8654 AccessSpecifier AS, NamedDecl *PrevDecl, 8655 Declarator *D) { 8656 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8657 bool InvalidDecl = false; 8658 if (D) InvalidDecl = D->isInvalidType(); 8659 8660 // If we receive a broken type, recover by assuming 'int' and 8661 // marking this declaration as invalid. 8662 if (T.isNull()) { 8663 InvalidDecl = true; 8664 T = Context.IntTy; 8665 } 8666 8667 QualType EltTy = Context.getBaseElementType(T); 8668 if (!EltTy->isDependentType() && 8669 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8670 // Fields of incomplete type force their record to be invalid. 8671 Record->setInvalidDecl(); 8672 InvalidDecl = true; 8673 } 8674 8675 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8676 // than a variably modified type. 8677 if (!InvalidDecl && T->isVariablyModifiedType()) { 8678 bool SizeIsNegative; 8679 llvm::APSInt Oversized; 8680 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8681 SizeIsNegative, 8682 Oversized); 8683 if (!FixedTy.isNull()) { 8684 Diag(Loc, diag::warn_illegal_constant_array_size); 8685 T = FixedTy; 8686 } else { 8687 if (SizeIsNegative) 8688 Diag(Loc, diag::err_typecheck_negative_array_size); 8689 else if (Oversized.getBoolValue()) 8690 Diag(Loc, diag::err_array_too_large) 8691 << Oversized.toString(10); 8692 else 8693 Diag(Loc, diag::err_typecheck_field_variable_size); 8694 InvalidDecl = true; 8695 } 8696 } 8697 8698 // Fields can not have abstract class types 8699 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8700 diag::err_abstract_type_in_decl, 8701 AbstractFieldType)) 8702 InvalidDecl = true; 8703 8704 bool ZeroWidth = false; 8705 // If this is declared as a bit-field, check the bit-field. 8706 if (!InvalidDecl && BitWidth) { 8707 BitWidth = VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth).take(); 8708 if (!BitWidth) { 8709 InvalidDecl = true; 8710 BitWidth = 0; 8711 ZeroWidth = false; 8712 } 8713 } 8714 8715 // Check that 'mutable' is consistent with the type of the declaration. 8716 if (!InvalidDecl && Mutable) { 8717 unsigned DiagID = 0; 8718 if (T->isReferenceType()) 8719 DiagID = diag::err_mutable_reference; 8720 else if (T.isConstQualified()) 8721 DiagID = diag::err_mutable_const; 8722 8723 if (DiagID) { 8724 SourceLocation ErrLoc = Loc; 8725 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8726 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8727 Diag(ErrLoc, DiagID); 8728 Mutable = false; 8729 InvalidDecl = true; 8730 } 8731 } 8732 8733 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8734 BitWidth, Mutable, HasInit); 8735 if (InvalidDecl) 8736 NewFD->setInvalidDecl(); 8737 8738 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8739 Diag(Loc, diag::err_duplicate_member) << II; 8740 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8741 NewFD->setInvalidDecl(); 8742 } 8743 8744 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8745 if (Record->isUnion()) { 8746 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8747 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8748 if (RDecl->getDefinition()) { 8749 // C++ [class.union]p1: An object of a class with a non-trivial 8750 // constructor, a non-trivial copy constructor, a non-trivial 8751 // destructor, or a non-trivial copy assignment operator 8752 // cannot be a member of a union, nor can an array of such 8753 // objects. 8754 if (CheckNontrivialField(NewFD)) 8755 NewFD->setInvalidDecl(); 8756 } 8757 } 8758 8759 // C++ [class.union]p1: If a union contains a member of reference type, 8760 // the program is ill-formed. 8761 if (EltTy->isReferenceType()) { 8762 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8763 << NewFD->getDeclName() << EltTy; 8764 NewFD->setInvalidDecl(); 8765 } 8766 } 8767 } 8768 8769 // FIXME: We need to pass in the attributes given an AST 8770 // representation, not a parser representation. 8771 if (D) 8772 // FIXME: What to pass instead of TUScope? 8773 ProcessDeclAttributes(TUScope, NewFD, *D); 8774 8775 // In auto-retain/release, infer strong retension for fields of 8776 // retainable type. 8777 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8778 NewFD->setInvalidDecl(); 8779 8780 if (T.isObjCGCWeak()) 8781 Diag(Loc, diag::warn_attribute_weak_on_field); 8782 8783 NewFD->setAccess(AS); 8784 return NewFD; 8785} 8786 8787bool Sema::CheckNontrivialField(FieldDecl *FD) { 8788 assert(FD); 8789 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8790 8791 if (FD->isInvalidDecl()) 8792 return true; 8793 8794 QualType EltTy = Context.getBaseElementType(FD->getType()); 8795 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8796 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8797 if (RDecl->getDefinition()) { 8798 // We check for copy constructors before constructors 8799 // because otherwise we'll never get complaints about 8800 // copy constructors. 8801 8802 CXXSpecialMember member = CXXInvalid; 8803 if (!RDecl->hasTrivialCopyConstructor()) 8804 member = CXXCopyConstructor; 8805 else if (!RDecl->hasTrivialDefaultConstructor()) 8806 member = CXXDefaultConstructor; 8807 else if (!RDecl->hasTrivialCopyAssignment()) 8808 member = CXXCopyAssignment; 8809 else if (!RDecl->hasTrivialDestructor()) 8810 member = CXXDestructor; 8811 8812 if (member != CXXInvalid) { 8813 if (!getLangOptions().CPlusPlus0x && 8814 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8815 // Objective-C++ ARC: it is an error to have a non-trivial field of 8816 // a union. However, system headers in Objective-C programs 8817 // occasionally have Objective-C lifetime objects within unions, 8818 // and rather than cause the program to fail, we make those 8819 // members unavailable. 8820 SourceLocation Loc = FD->getLocation(); 8821 if (getSourceManager().isInSystemHeader(Loc)) { 8822 if (!FD->hasAttr<UnavailableAttr>()) 8823 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8824 "this system field has retaining ownership")); 8825 return false; 8826 } 8827 } 8828 8829 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8830 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8831 diag::err_illegal_union_or_anon_struct_member) 8832 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8833 DiagnoseNontrivial(RT, member); 8834 return !getLangOptions().CPlusPlus0x; 8835 } 8836 } 8837 } 8838 8839 return false; 8840} 8841 8842/// DiagnoseNontrivial - Given that a class has a non-trivial 8843/// special member, figure out why. 8844void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8845 QualType QT(T, 0U); 8846 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8847 8848 // Check whether the member was user-declared. 8849 switch (member) { 8850 case CXXInvalid: 8851 break; 8852 8853 case CXXDefaultConstructor: 8854 if (RD->hasUserDeclaredConstructor()) { 8855 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8856 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8857 const FunctionDecl *body = 0; 8858 ci->hasBody(body); 8859 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8860 SourceLocation CtorLoc = ci->getLocation(); 8861 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8862 return; 8863 } 8864 } 8865 8866 llvm_unreachable("found no user-declared constructors"); 8867 } 8868 break; 8869 8870 case CXXCopyConstructor: 8871 if (RD->hasUserDeclaredCopyConstructor()) { 8872 SourceLocation CtorLoc = 8873 RD->getCopyConstructor(0)->getLocation(); 8874 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8875 return; 8876 } 8877 break; 8878 8879 case CXXMoveConstructor: 8880 if (RD->hasUserDeclaredMoveConstructor()) { 8881 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8882 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8883 return; 8884 } 8885 break; 8886 8887 case CXXCopyAssignment: 8888 if (RD->hasUserDeclaredCopyAssignment()) { 8889 // FIXME: this should use the location of the copy 8890 // assignment, not the type. 8891 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8892 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8893 return; 8894 } 8895 break; 8896 8897 case CXXMoveAssignment: 8898 if (RD->hasUserDeclaredMoveAssignment()) { 8899 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8900 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8901 return; 8902 } 8903 break; 8904 8905 case CXXDestructor: 8906 if (RD->hasUserDeclaredDestructor()) { 8907 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8908 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8909 return; 8910 } 8911 break; 8912 } 8913 8914 typedef CXXRecordDecl::base_class_iterator base_iter; 8915 8916 // Virtual bases and members inhibit trivial copying/construction, 8917 // but not trivial destruction. 8918 if (member != CXXDestructor) { 8919 // Check for virtual bases. vbases includes indirect virtual bases, 8920 // so we just iterate through the direct bases. 8921 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8922 if (bi->isVirtual()) { 8923 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8924 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8925 return; 8926 } 8927 8928 // Check for virtual methods. 8929 typedef CXXRecordDecl::method_iterator meth_iter; 8930 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8931 ++mi) { 8932 if (mi->isVirtual()) { 8933 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8934 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8935 return; 8936 } 8937 } 8938 } 8939 8940 bool (CXXRecordDecl::*hasTrivial)() const; 8941 switch (member) { 8942 case CXXDefaultConstructor: 8943 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8944 case CXXCopyConstructor: 8945 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8946 case CXXCopyAssignment: 8947 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8948 case CXXDestructor: 8949 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8950 default: 8951 llvm_unreachable("unexpected special member"); 8952 } 8953 8954 // Check for nontrivial bases (and recurse). 8955 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8956 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8957 assert(BaseRT && "Don't know how to handle dependent bases"); 8958 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8959 if (!(BaseRecTy->*hasTrivial)()) { 8960 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8961 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8962 DiagnoseNontrivial(BaseRT, member); 8963 return; 8964 } 8965 } 8966 8967 // Check for nontrivial members (and recurse). 8968 typedef RecordDecl::field_iterator field_iter; 8969 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8970 ++fi) { 8971 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8972 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8973 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8974 8975 if (!(EltRD->*hasTrivial)()) { 8976 SourceLocation FLoc = (*fi)->getLocation(); 8977 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8978 DiagnoseNontrivial(EltRT, member); 8979 return; 8980 } 8981 } 8982 8983 if (EltTy->isObjCLifetimeType()) { 8984 switch (EltTy.getObjCLifetime()) { 8985 case Qualifiers::OCL_None: 8986 case Qualifiers::OCL_ExplicitNone: 8987 break; 8988 8989 case Qualifiers::OCL_Autoreleasing: 8990 case Qualifiers::OCL_Weak: 8991 case Qualifiers::OCL_Strong: 8992 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8993 << QT << EltTy.getObjCLifetime(); 8994 return; 8995 } 8996 } 8997 } 8998 8999 llvm_unreachable("found no explanation for non-trivial member"); 9000} 9001 9002/// TranslateIvarVisibility - Translate visibility from a token ID to an 9003/// AST enum value. 9004static ObjCIvarDecl::AccessControl 9005TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 9006 switch (ivarVisibility) { 9007 default: llvm_unreachable("Unknown visitibility kind"); 9008 case tok::objc_private: return ObjCIvarDecl::Private; 9009 case tok::objc_public: return ObjCIvarDecl::Public; 9010 case tok::objc_protected: return ObjCIvarDecl::Protected; 9011 case tok::objc_package: return ObjCIvarDecl::Package; 9012 } 9013} 9014 9015/// ActOnIvar - Each ivar field of an objective-c class is passed into this 9016/// in order to create an IvarDecl object for it. 9017Decl *Sema::ActOnIvar(Scope *S, 9018 SourceLocation DeclStart, 9019 Declarator &D, Expr *BitfieldWidth, 9020 tok::ObjCKeywordKind Visibility) { 9021 9022 IdentifierInfo *II = D.getIdentifier(); 9023 Expr *BitWidth = (Expr*)BitfieldWidth; 9024 SourceLocation Loc = DeclStart; 9025 if (II) Loc = D.getIdentifierLoc(); 9026 9027 // FIXME: Unnamed fields can be handled in various different ways, for 9028 // example, unnamed unions inject all members into the struct namespace! 9029 9030 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9031 QualType T = TInfo->getType(); 9032 9033 if (BitWidth) { 9034 // 6.7.2.1p3, 6.7.2.1p4 9035 BitWidth = VerifyBitField(Loc, II, T, BitWidth).take(); 9036 if (!BitWidth) 9037 D.setInvalidType(); 9038 } else { 9039 // Not a bitfield. 9040 9041 // validate II. 9042 9043 } 9044 if (T->isReferenceType()) { 9045 Diag(Loc, diag::err_ivar_reference_type); 9046 D.setInvalidType(); 9047 } 9048 // C99 6.7.2.1p8: A member of a structure or union may have any type other 9049 // than a variably modified type. 9050 else if (T->isVariablyModifiedType()) { 9051 Diag(Loc, diag::err_typecheck_ivar_variable_size); 9052 D.setInvalidType(); 9053 } 9054 9055 // Get the visibility (access control) for this ivar. 9056 ObjCIvarDecl::AccessControl ac = 9057 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9058 : ObjCIvarDecl::None; 9059 // Must set ivar's DeclContext to its enclosing interface. 9060 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9061 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl()) 9062 return 0; 9063 ObjCContainerDecl *EnclosingContext; 9064 if (ObjCImplementationDecl *IMPDecl = 9065 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9066 if (!LangOpts.ObjCNonFragileABI2) { 9067 // Case of ivar declared in an implementation. Context is that of its class. 9068 EnclosingContext = IMPDecl->getClassInterface(); 9069 assert(EnclosingContext && "Implementation has no class interface!"); 9070 } 9071 else 9072 EnclosingContext = EnclosingDecl; 9073 } else { 9074 if (ObjCCategoryDecl *CDecl = 9075 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9076 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9077 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9078 return 0; 9079 } 9080 } 9081 EnclosingContext = EnclosingDecl; 9082 } 9083 9084 // Construct the decl. 9085 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9086 DeclStart, Loc, II, T, 9087 TInfo, ac, (Expr *)BitfieldWidth); 9088 9089 if (II) { 9090 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9091 ForRedeclaration); 9092 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9093 && !isa<TagDecl>(PrevDecl)) { 9094 Diag(Loc, diag::err_duplicate_member) << II; 9095 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9096 NewID->setInvalidDecl(); 9097 } 9098 } 9099 9100 // Process attributes attached to the ivar. 9101 ProcessDeclAttributes(S, NewID, D); 9102 9103 if (D.isInvalidType()) 9104 NewID->setInvalidDecl(); 9105 9106 // In ARC, infer 'retaining' for ivars of retainable type. 9107 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9108 NewID->setInvalidDecl(); 9109 9110 if (D.getDeclSpec().isModulePrivateSpecified()) 9111 NewID->setModulePrivate(); 9112 9113 if (II) { 9114 // FIXME: When interfaces are DeclContexts, we'll need to add 9115 // these to the interface. 9116 S->AddDecl(NewID); 9117 IdResolver.AddDecl(NewID); 9118 } 9119 9120 return NewID; 9121} 9122 9123/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9124/// class and class extensions. For every class @interface and class 9125/// extension @interface, if the last ivar is a bitfield of any type, 9126/// then add an implicit `char :0` ivar to the end of that interface. 9127void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9128 SmallVectorImpl<Decl *> &AllIvarDecls) { 9129 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9130 return; 9131 9132 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9133 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9134 9135 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9136 return; 9137 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9138 if (!ID) { 9139 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9140 if (!CD->IsClassExtension()) 9141 return; 9142 } 9143 // No need to add this to end of @implementation. 9144 else 9145 return; 9146 } 9147 // All conditions are met. Add a new bitfield to the tail end of ivars. 9148 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9149 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9150 9151 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9152 DeclLoc, DeclLoc, 0, 9153 Context.CharTy, 9154 Context.getTrivialTypeSourceInfo(Context.CharTy, 9155 DeclLoc), 9156 ObjCIvarDecl::Private, BW, 9157 true); 9158 AllIvarDecls.push_back(Ivar); 9159} 9160 9161void Sema::ActOnFields(Scope* S, 9162 SourceLocation RecLoc, Decl *EnclosingDecl, 9163 llvm::ArrayRef<Decl *> Fields, 9164 SourceLocation LBrac, SourceLocation RBrac, 9165 AttributeList *Attr) { 9166 assert(EnclosingDecl && "missing record or interface decl"); 9167 9168 // If the decl this is being inserted into is invalid, then it may be a 9169 // redeclaration or some other bogus case. Don't try to add fields to it. 9170 if (EnclosingDecl->isInvalidDecl()) 9171 return; 9172 9173 // Verify that all the fields are okay. 9174 unsigned NumNamedMembers = 0; 9175 SmallVector<FieldDecl*, 32> RecFields; 9176 9177 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9178 bool ARCErrReported = false; 9179 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9180 i != end; ++i) { 9181 FieldDecl *FD = cast<FieldDecl>(*i); 9182 9183 // Get the type for the field. 9184 const Type *FDTy = FD->getType().getTypePtr(); 9185 9186 if (!FD->isAnonymousStructOrUnion()) { 9187 // Remember all fields written by the user. 9188 RecFields.push_back(FD); 9189 } 9190 9191 // If the field is already invalid for some reason, don't emit more 9192 // diagnostics about it. 9193 if (FD->isInvalidDecl()) { 9194 EnclosingDecl->setInvalidDecl(); 9195 continue; 9196 } 9197 9198 // C99 6.7.2.1p2: 9199 // A structure or union shall not contain a member with 9200 // incomplete or function type (hence, a structure shall not 9201 // contain an instance of itself, but may contain a pointer to 9202 // an instance of itself), except that the last member of a 9203 // structure with more than one named member may have incomplete 9204 // array type; such a structure (and any union containing, 9205 // possibly recursively, a member that is such a structure) 9206 // shall not be a member of a structure or an element of an 9207 // array. 9208 if (FDTy->isFunctionType()) { 9209 // Field declared as a function. 9210 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9211 << FD->getDeclName(); 9212 FD->setInvalidDecl(); 9213 EnclosingDecl->setInvalidDecl(); 9214 continue; 9215 } else if (FDTy->isIncompleteArrayType() && Record && 9216 ((i + 1 == Fields.end() && !Record->isUnion()) || 9217 ((getLangOptions().MicrosoftExt || 9218 getLangOptions().CPlusPlus) && 9219 (i + 1 == Fields.end() || Record->isUnion())))) { 9220 // Flexible array member. 9221 // Microsoft and g++ is more permissive regarding flexible array. 9222 // It will accept flexible array in union and also 9223 // as the sole element of a struct/class. 9224 if (getLangOptions().MicrosoftExt) { 9225 if (Record->isUnion()) 9226 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9227 << FD->getDeclName(); 9228 else if (Fields.size() == 1) 9229 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9230 << FD->getDeclName() << Record->getTagKind(); 9231 } else if (getLangOptions().CPlusPlus) { 9232 if (Record->isUnion()) 9233 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9234 << FD->getDeclName(); 9235 else if (Fields.size() == 1) 9236 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9237 << FD->getDeclName() << Record->getTagKind(); 9238 } else if (NumNamedMembers < 1) { 9239 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9240 << FD->getDeclName(); 9241 FD->setInvalidDecl(); 9242 EnclosingDecl->setInvalidDecl(); 9243 continue; 9244 } 9245 if (!FD->getType()->isDependentType() && 9246 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9247 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9248 << FD->getDeclName() << FD->getType(); 9249 FD->setInvalidDecl(); 9250 EnclosingDecl->setInvalidDecl(); 9251 continue; 9252 } 9253 // Okay, we have a legal flexible array member at the end of the struct. 9254 if (Record) 9255 Record->setHasFlexibleArrayMember(true); 9256 } else if (!FDTy->isDependentType() && 9257 RequireCompleteType(FD->getLocation(), FD->getType(), 9258 diag::err_field_incomplete)) { 9259 // Incomplete type 9260 FD->setInvalidDecl(); 9261 EnclosingDecl->setInvalidDecl(); 9262 continue; 9263 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9264 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9265 // If this is a member of a union, then entire union becomes "flexible". 9266 if (Record && Record->isUnion()) { 9267 Record->setHasFlexibleArrayMember(true); 9268 } else { 9269 // If this is a struct/class and this is not the last element, reject 9270 // it. Note that GCC supports variable sized arrays in the middle of 9271 // structures. 9272 if (i + 1 != Fields.end()) 9273 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9274 << FD->getDeclName() << FD->getType(); 9275 else { 9276 // We support flexible arrays at the end of structs in 9277 // other structs as an extension. 9278 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9279 << FD->getDeclName(); 9280 if (Record) 9281 Record->setHasFlexibleArrayMember(true); 9282 } 9283 } 9284 } 9285 if (Record && FDTTy->getDecl()->hasObjectMember()) 9286 Record->setHasObjectMember(true); 9287 } else if (FDTy->isObjCObjectType()) { 9288 /// A field cannot be an Objective-c object 9289 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9290 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9291 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9292 FD->setType(T); 9293 } 9294 else if (!getLangOptions().CPlusPlus) { 9295 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9296 // It's an error in ARC if a field has lifetime. 9297 // We don't want to report this in a system header, though, 9298 // so we just make the field unavailable. 9299 // FIXME: that's really not sufficient; we need to make the type 9300 // itself invalid to, say, initialize or copy. 9301 QualType T = FD->getType(); 9302 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9303 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9304 SourceLocation loc = FD->getLocation(); 9305 if (getSourceManager().isInSystemHeader(loc)) { 9306 if (!FD->hasAttr<UnavailableAttr>()) { 9307 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9308 "this system field has retaining ownership")); 9309 } 9310 } else { 9311 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9312 << T->isBlockPointerType(); 9313 } 9314 ARCErrReported = true; 9315 } 9316 } 9317 else if (getLangOptions().ObjC1 && 9318 getLangOptions().getGC() != LangOptions::NonGC && 9319 Record && !Record->hasObjectMember()) { 9320 if (FD->getType()->isObjCObjectPointerType() || 9321 FD->getType().isObjCGCStrong()) 9322 Record->setHasObjectMember(true); 9323 else if (Context.getAsArrayType(FD->getType())) { 9324 QualType BaseType = Context.getBaseElementType(FD->getType()); 9325 if (BaseType->isRecordType() && 9326 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9327 Record->setHasObjectMember(true); 9328 else if (BaseType->isObjCObjectPointerType() || 9329 BaseType.isObjCGCStrong()) 9330 Record->setHasObjectMember(true); 9331 } 9332 } 9333 } 9334 // Keep track of the number of named members. 9335 if (FD->getIdentifier()) 9336 ++NumNamedMembers; 9337 } 9338 9339 // Okay, we successfully defined 'Record'. 9340 if (Record) { 9341 bool Completed = false; 9342 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9343 if (!CXXRecord->isInvalidDecl()) { 9344 // Set access bits correctly on the directly-declared conversions. 9345 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9346 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9347 I != E; ++I) 9348 Convs->setAccess(I, (*I)->getAccess()); 9349 9350 if (!CXXRecord->isDependentType()) { 9351 // Objective-C Automatic Reference Counting: 9352 // If a class has a non-static data member of Objective-C pointer 9353 // type (or array thereof), it is a non-POD type and its 9354 // default constructor (if any), copy constructor, copy assignment 9355 // operator, and destructor are non-trivial. 9356 // 9357 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9358 // However, here we check whether this particular class is only 9359 // non-POD because of the presence of an Objective-C pointer member. 9360 // If so, objects of this type cannot be shared between code compiled 9361 // with instant objects and code compiled with manual retain/release. 9362 if (getLangOptions().ObjCAutoRefCount && 9363 CXXRecord->hasObjectMember() && 9364 CXXRecord->getLinkage() == ExternalLinkage) { 9365 if (CXXRecord->isPOD()) { 9366 Diag(CXXRecord->getLocation(), 9367 diag::warn_arc_non_pod_class_with_object_member) 9368 << CXXRecord; 9369 } else { 9370 // FIXME: Fix-Its would be nice here, but finding a good location 9371 // for them is going to be tricky. 9372 if (CXXRecord->hasTrivialCopyConstructor()) 9373 Diag(CXXRecord->getLocation(), 9374 diag::warn_arc_trivial_member_function_with_object_member) 9375 << CXXRecord << 0; 9376 if (CXXRecord->hasTrivialCopyAssignment()) 9377 Diag(CXXRecord->getLocation(), 9378 diag::warn_arc_trivial_member_function_with_object_member) 9379 << CXXRecord << 1; 9380 if (CXXRecord->hasTrivialDestructor()) 9381 Diag(CXXRecord->getLocation(), 9382 diag::warn_arc_trivial_member_function_with_object_member) 9383 << CXXRecord << 2; 9384 } 9385 } 9386 9387 // Adjust user-defined destructor exception spec. 9388 if (getLangOptions().CPlusPlus0x && 9389 CXXRecord->hasUserDeclaredDestructor()) 9390 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9391 9392 // Add any implicitly-declared members to this class. 9393 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9394 9395 // If we have virtual base classes, we may end up finding multiple 9396 // final overriders for a given virtual function. Check for this 9397 // problem now. 9398 if (CXXRecord->getNumVBases()) { 9399 CXXFinalOverriderMap FinalOverriders; 9400 CXXRecord->getFinalOverriders(FinalOverriders); 9401 9402 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9403 MEnd = FinalOverriders.end(); 9404 M != MEnd; ++M) { 9405 for (OverridingMethods::iterator SO = M->second.begin(), 9406 SOEnd = M->second.end(); 9407 SO != SOEnd; ++SO) { 9408 assert(SO->second.size() > 0 && 9409 "Virtual function without overridding functions?"); 9410 if (SO->second.size() == 1) 9411 continue; 9412 9413 // C++ [class.virtual]p2: 9414 // In a derived class, if a virtual member function of a base 9415 // class subobject has more than one final overrider the 9416 // program is ill-formed. 9417 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9418 << (NamedDecl *)M->first << Record; 9419 Diag(M->first->getLocation(), 9420 diag::note_overridden_virtual_function); 9421 for (OverridingMethods::overriding_iterator 9422 OM = SO->second.begin(), 9423 OMEnd = SO->second.end(); 9424 OM != OMEnd; ++OM) 9425 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9426 << (NamedDecl *)M->first << OM->Method->getParent(); 9427 9428 Record->setInvalidDecl(); 9429 } 9430 } 9431 CXXRecord->completeDefinition(&FinalOverriders); 9432 Completed = true; 9433 } 9434 } 9435 } 9436 } 9437 9438 if (!Completed) 9439 Record->completeDefinition(); 9440 9441 // Now that the record is complete, do any delayed exception spec checks 9442 // we were missing. 9443 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9444 const CXXDestructorDecl *Dtor = 9445 DelayedDestructorExceptionSpecChecks.back().first; 9446 if (Dtor->getParent() != Record) 9447 break; 9448 9449 assert(!Dtor->getParent()->isDependentType() && 9450 "Should not ever add destructors of templates into the list."); 9451 CheckOverridingFunctionExceptionSpec(Dtor, 9452 DelayedDestructorExceptionSpecChecks.back().second); 9453 DelayedDestructorExceptionSpecChecks.pop_back(); 9454 } 9455 9456 } else { 9457 ObjCIvarDecl **ClsFields = 9458 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9459 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9460 ID->setEndOfDefinitionLoc(RBrac); 9461 // Add ivar's to class's DeclContext. 9462 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9463 ClsFields[i]->setLexicalDeclContext(ID); 9464 ID->addDecl(ClsFields[i]); 9465 } 9466 // Must enforce the rule that ivars in the base classes may not be 9467 // duplicates. 9468 if (ID->getSuperClass()) 9469 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9470 } else if (ObjCImplementationDecl *IMPDecl = 9471 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9472 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9473 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9474 // Ivar declared in @implementation never belongs to the implementation. 9475 // Only it is in implementation's lexical context. 9476 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9477 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9478 } else if (ObjCCategoryDecl *CDecl = 9479 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9480 // case of ivars in class extension; all other cases have been 9481 // reported as errors elsewhere. 9482 // FIXME. Class extension does not have a LocEnd field. 9483 // CDecl->setLocEnd(RBrac); 9484 // Add ivar's to class extension's DeclContext. 9485 // Diagnose redeclaration of private ivars. 9486 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9487 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9488 if (IDecl) { 9489 if (const ObjCIvarDecl *ClsIvar = 9490 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9491 Diag(ClsFields[i]->getLocation(), 9492 diag::err_duplicate_ivar_declaration); 9493 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9494 continue; 9495 } 9496 for (const ObjCCategoryDecl *ClsExtDecl = 9497 IDecl->getFirstClassExtension(); 9498 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9499 if (const ObjCIvarDecl *ClsExtIvar = 9500 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9501 Diag(ClsFields[i]->getLocation(), 9502 diag::err_duplicate_ivar_declaration); 9503 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9504 continue; 9505 } 9506 } 9507 } 9508 ClsFields[i]->setLexicalDeclContext(CDecl); 9509 CDecl->addDecl(ClsFields[i]); 9510 } 9511 } 9512 } 9513 9514 if (Attr) 9515 ProcessDeclAttributeList(S, Record, Attr); 9516 9517 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9518 // set the visibility of this record. 9519 if (Record && !Record->getDeclContext()->isRecord()) 9520 AddPushedVisibilityAttribute(Record); 9521} 9522 9523/// \brief Determine whether the given integral value is representable within 9524/// the given type T. 9525static bool isRepresentableIntegerValue(ASTContext &Context, 9526 llvm::APSInt &Value, 9527 QualType T) { 9528 assert(T->isIntegralType(Context) && "Integral type required!"); 9529 unsigned BitWidth = Context.getIntWidth(T); 9530 9531 if (Value.isUnsigned() || Value.isNonNegative()) { 9532 if (T->isSignedIntegerOrEnumerationType()) 9533 --BitWidth; 9534 return Value.getActiveBits() <= BitWidth; 9535 } 9536 return Value.getMinSignedBits() <= BitWidth; 9537} 9538 9539// \brief Given an integral type, return the next larger integral type 9540// (or a NULL type of no such type exists). 9541static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9542 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9543 // enum checking below. 9544 assert(T->isIntegralType(Context) && "Integral type required!"); 9545 const unsigned NumTypes = 4; 9546 QualType SignedIntegralTypes[NumTypes] = { 9547 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9548 }; 9549 QualType UnsignedIntegralTypes[NumTypes] = { 9550 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9551 Context.UnsignedLongLongTy 9552 }; 9553 9554 unsigned BitWidth = Context.getTypeSize(T); 9555 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9556 : UnsignedIntegralTypes; 9557 for (unsigned I = 0; I != NumTypes; ++I) 9558 if (Context.getTypeSize(Types[I]) > BitWidth) 9559 return Types[I]; 9560 9561 return QualType(); 9562} 9563 9564EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9565 EnumConstantDecl *LastEnumConst, 9566 SourceLocation IdLoc, 9567 IdentifierInfo *Id, 9568 Expr *Val) { 9569 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9570 llvm::APSInt EnumVal(IntWidth); 9571 QualType EltTy; 9572 9573 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9574 Val = 0; 9575 9576 if (Val) 9577 Val = DefaultLvalueConversion(Val).take(); 9578 9579 if (Val) { 9580 if (Enum->isDependentType() || Val->isTypeDependent()) 9581 EltTy = Context.DependentTy; 9582 else { 9583 SourceLocation ExpLoc; 9584 if (getLangOptions().CPlusPlus0x && Enum->isFixed() && 9585 !getLangOptions().MicrosoftMode) { 9586 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the 9587 // constant-expression in the enumerator-definition shall be a converted 9588 // constant expression of the underlying type. 9589 EltTy = Enum->getIntegerType(); 9590 ExprResult Converted = 9591 CheckConvertedConstantExpression(Val, EltTy, EnumVal, 9592 CCEK_Enumerator); 9593 if (Converted.isInvalid()) 9594 Val = 0; 9595 else 9596 Val = Converted.take(); 9597 } else if (!Val->isValueDependent() && 9598 !(Val = VerifyIntegerConstantExpression(Val, 9599 &EnumVal).take())) { 9600 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9601 } else { 9602 if (!getLangOptions().CPlusPlus) { 9603 // C99 6.7.2.2p2: 9604 // The expression that defines the value of an enumeration constant 9605 // shall be an integer constant expression that has a value 9606 // representable as an int. 9607 9608 // Complain if the value is not representable in an int. 9609 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9610 Diag(IdLoc, diag::ext_enum_value_not_int) 9611 << EnumVal.toString(10) << Val->getSourceRange() 9612 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9613 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9614 // Force the type of the expression to 'int'. 9615 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9616 } 9617 } 9618 9619 if (Enum->isFixed()) { 9620 EltTy = Enum->getIntegerType(); 9621 9622 // In Obj-C and Microsoft mode, require the enumeration value to be 9623 // representable in the underlying type of the enumeration. In C++11, 9624 // we perform a non-narrowing conversion as part of converted constant 9625 // expression checking. 9626 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9627 if (getLangOptions().MicrosoftExt) { 9628 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9629 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9630 } else 9631 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy; 9632 } else 9633 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9634 } else { 9635 // C++11 [dcl.enum]p5: 9636 // If the underlying type is not fixed, the type of each enumerator 9637 // is the type of its initializing value: 9638 // - If an initializer is specified for an enumerator, the 9639 // initializing value has the same type as the expression. 9640 EltTy = Val->getType(); 9641 } 9642 } 9643 } 9644 } 9645 9646 if (!Val) { 9647 if (Enum->isDependentType()) 9648 EltTy = Context.DependentTy; 9649 else if (!LastEnumConst) { 9650 // C++0x [dcl.enum]p5: 9651 // If the underlying type is not fixed, the type of each enumerator 9652 // is the type of its initializing value: 9653 // - If no initializer is specified for the first enumerator, the 9654 // initializing value has an unspecified integral type. 9655 // 9656 // GCC uses 'int' for its unspecified integral type, as does 9657 // C99 6.7.2.2p3. 9658 if (Enum->isFixed()) { 9659 EltTy = Enum->getIntegerType(); 9660 } 9661 else { 9662 EltTy = Context.IntTy; 9663 } 9664 } else { 9665 // Assign the last value + 1. 9666 EnumVal = LastEnumConst->getInitVal(); 9667 ++EnumVal; 9668 EltTy = LastEnumConst->getType(); 9669 9670 // Check for overflow on increment. 9671 if (EnumVal < LastEnumConst->getInitVal()) { 9672 // C++0x [dcl.enum]p5: 9673 // If the underlying type is not fixed, the type of each enumerator 9674 // is the type of its initializing value: 9675 // 9676 // - Otherwise the type of the initializing value is the same as 9677 // the type of the initializing value of the preceding enumerator 9678 // unless the incremented value is not representable in that type, 9679 // in which case the type is an unspecified integral type 9680 // sufficient to contain the incremented value. If no such type 9681 // exists, the program is ill-formed. 9682 QualType T = getNextLargerIntegralType(Context, EltTy); 9683 if (T.isNull() || Enum->isFixed()) { 9684 // There is no integral type larger enough to represent this 9685 // value. Complain, then allow the value to wrap around. 9686 EnumVal = LastEnumConst->getInitVal(); 9687 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9688 ++EnumVal; 9689 if (Enum->isFixed()) 9690 // When the underlying type is fixed, this is ill-formed. 9691 Diag(IdLoc, diag::err_enumerator_wrapped) 9692 << EnumVal.toString(10) 9693 << EltTy; 9694 else 9695 Diag(IdLoc, diag::warn_enumerator_too_large) 9696 << EnumVal.toString(10); 9697 } else { 9698 EltTy = T; 9699 } 9700 9701 // Retrieve the last enumerator's value, extent that type to the 9702 // type that is supposed to be large enough to represent the incremented 9703 // value, then increment. 9704 EnumVal = LastEnumConst->getInitVal(); 9705 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9706 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9707 ++EnumVal; 9708 9709 // If we're not in C++, diagnose the overflow of enumerator values, 9710 // which in C99 means that the enumerator value is not representable in 9711 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9712 // permits enumerator values that are representable in some larger 9713 // integral type. 9714 if (!getLangOptions().CPlusPlus && !T.isNull()) 9715 Diag(IdLoc, diag::warn_enum_value_overflow); 9716 } else if (!getLangOptions().CPlusPlus && 9717 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9718 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9719 Diag(IdLoc, diag::ext_enum_value_not_int) 9720 << EnumVal.toString(10) << 1; 9721 } 9722 } 9723 } 9724 9725 if (!EltTy->isDependentType()) { 9726 // Make the enumerator value match the signedness and size of the 9727 // enumerator's type. 9728 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9729 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9730 } 9731 9732 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9733 Val, EnumVal); 9734} 9735 9736 9737Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9738 SourceLocation IdLoc, IdentifierInfo *Id, 9739 AttributeList *Attr, 9740 SourceLocation EqualLoc, Expr *Val) { 9741 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9742 EnumConstantDecl *LastEnumConst = 9743 cast_or_null<EnumConstantDecl>(lastEnumConst); 9744 9745 // The scope passed in may not be a decl scope. Zip up the scope tree until 9746 // we find one that is. 9747 S = getNonFieldDeclScope(S); 9748 9749 // Verify that there isn't already something declared with this name in this 9750 // scope. 9751 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9752 ForRedeclaration); 9753 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9754 // Maybe we will complain about the shadowed template parameter. 9755 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9756 // Just pretend that we didn't see the previous declaration. 9757 PrevDecl = 0; 9758 } 9759 9760 if (PrevDecl) { 9761 // When in C++, we may get a TagDecl with the same name; in this case the 9762 // enum constant will 'hide' the tag. 9763 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9764 "Received TagDecl when not in C++!"); 9765 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9766 if (isa<EnumConstantDecl>(PrevDecl)) 9767 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9768 else 9769 Diag(IdLoc, diag::err_redefinition) << Id; 9770 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9771 return 0; 9772 } 9773 } 9774 9775 // C++ [class.mem]p13: 9776 // If T is the name of a class, then each of the following shall have a 9777 // name different from T: 9778 // - every enumerator of every member of class T that is an enumerated 9779 // type 9780 if (CXXRecordDecl *Record 9781 = dyn_cast<CXXRecordDecl>( 9782 TheEnumDecl->getDeclContext()->getRedeclContext())) 9783 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9784 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9785 9786 EnumConstantDecl *New = 9787 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9788 9789 if (New) { 9790 // Process attributes. 9791 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9792 9793 // Register this decl in the current scope stack. 9794 New->setAccess(TheEnumDecl->getAccess()); 9795 PushOnScopeChains(New, S); 9796 } 9797 9798 return New; 9799} 9800 9801void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9802 SourceLocation RBraceLoc, Decl *EnumDeclX, 9803 Decl **Elements, unsigned NumElements, 9804 Scope *S, AttributeList *Attr) { 9805 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9806 QualType EnumType = Context.getTypeDeclType(Enum); 9807 9808 if (Attr) 9809 ProcessDeclAttributeList(S, Enum, Attr); 9810 9811 if (Enum->isDependentType()) { 9812 for (unsigned i = 0; i != NumElements; ++i) { 9813 EnumConstantDecl *ECD = 9814 cast_or_null<EnumConstantDecl>(Elements[i]); 9815 if (!ECD) continue; 9816 9817 ECD->setType(EnumType); 9818 } 9819 9820 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9821 return; 9822 } 9823 9824 // TODO: If the result value doesn't fit in an int, it must be a long or long 9825 // long value. ISO C does not support this, but GCC does as an extension, 9826 // emit a warning. 9827 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9828 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9829 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9830 9831 // Verify that all the values are okay, compute the size of the values, and 9832 // reverse the list. 9833 unsigned NumNegativeBits = 0; 9834 unsigned NumPositiveBits = 0; 9835 9836 // Keep track of whether all elements have type int. 9837 bool AllElementsInt = true; 9838 9839 for (unsigned i = 0; i != NumElements; ++i) { 9840 EnumConstantDecl *ECD = 9841 cast_or_null<EnumConstantDecl>(Elements[i]); 9842 if (!ECD) continue; // Already issued a diagnostic. 9843 9844 const llvm::APSInt &InitVal = ECD->getInitVal(); 9845 9846 // Keep track of the size of positive and negative values. 9847 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9848 NumPositiveBits = std::max(NumPositiveBits, 9849 (unsigned)InitVal.getActiveBits()); 9850 else 9851 NumNegativeBits = std::max(NumNegativeBits, 9852 (unsigned)InitVal.getMinSignedBits()); 9853 9854 // Keep track of whether every enum element has type int (very commmon). 9855 if (AllElementsInt) 9856 AllElementsInt = ECD->getType() == Context.IntTy; 9857 } 9858 9859 // Figure out the type that should be used for this enum. 9860 QualType BestType; 9861 unsigned BestWidth; 9862 9863 // C++0x N3000 [conv.prom]p3: 9864 // An rvalue of an unscoped enumeration type whose underlying 9865 // type is not fixed can be converted to an rvalue of the first 9866 // of the following types that can represent all the values of 9867 // the enumeration: int, unsigned int, long int, unsigned long 9868 // int, long long int, or unsigned long long int. 9869 // C99 6.4.4.3p2: 9870 // An identifier declared as an enumeration constant has type int. 9871 // The C99 rule is modified by a gcc extension 9872 QualType BestPromotionType; 9873 9874 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9875 // -fshort-enums is the equivalent to specifying the packed attribute on all 9876 // enum definitions. 9877 if (LangOpts.ShortEnums) 9878 Packed = true; 9879 9880 if (Enum->isFixed()) { 9881 BestType = Enum->getIntegerType(); 9882 if (BestType->isPromotableIntegerType()) 9883 BestPromotionType = Context.getPromotedIntegerType(BestType); 9884 else 9885 BestPromotionType = BestType; 9886 // We don't need to set BestWidth, because BestType is going to be the type 9887 // of the enumerators, but we do anyway because otherwise some compilers 9888 // warn that it might be used uninitialized. 9889 BestWidth = CharWidth; 9890 } 9891 else if (NumNegativeBits) { 9892 // If there is a negative value, figure out the smallest integer type (of 9893 // int/long/longlong) that fits. 9894 // If it's packed, check also if it fits a char or a short. 9895 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9896 BestType = Context.SignedCharTy; 9897 BestWidth = CharWidth; 9898 } else if (Packed && NumNegativeBits <= ShortWidth && 9899 NumPositiveBits < ShortWidth) { 9900 BestType = Context.ShortTy; 9901 BestWidth = ShortWidth; 9902 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9903 BestType = Context.IntTy; 9904 BestWidth = IntWidth; 9905 } else { 9906 BestWidth = Context.getTargetInfo().getLongWidth(); 9907 9908 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9909 BestType = Context.LongTy; 9910 } else { 9911 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9912 9913 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9914 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9915 BestType = Context.LongLongTy; 9916 } 9917 } 9918 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9919 } else { 9920 // If there is no negative value, figure out the smallest type that fits 9921 // all of the enumerator values. 9922 // If it's packed, check also if it fits a char or a short. 9923 if (Packed && NumPositiveBits <= CharWidth) { 9924 BestType = Context.UnsignedCharTy; 9925 BestPromotionType = Context.IntTy; 9926 BestWidth = CharWidth; 9927 } else if (Packed && NumPositiveBits <= ShortWidth) { 9928 BestType = Context.UnsignedShortTy; 9929 BestPromotionType = Context.IntTy; 9930 BestWidth = ShortWidth; 9931 } else if (NumPositiveBits <= IntWidth) { 9932 BestType = Context.UnsignedIntTy; 9933 BestWidth = IntWidth; 9934 BestPromotionType 9935 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9936 ? Context.UnsignedIntTy : Context.IntTy; 9937 } else if (NumPositiveBits <= 9938 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9939 BestType = Context.UnsignedLongTy; 9940 BestPromotionType 9941 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9942 ? Context.UnsignedLongTy : Context.LongTy; 9943 } else { 9944 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9945 assert(NumPositiveBits <= BestWidth && 9946 "How could an initializer get larger than ULL?"); 9947 BestType = Context.UnsignedLongLongTy; 9948 BestPromotionType 9949 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9950 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9951 } 9952 } 9953 9954 // Loop over all of the enumerator constants, changing their types to match 9955 // the type of the enum if needed. 9956 for (unsigned i = 0; i != NumElements; ++i) { 9957 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9958 if (!ECD) continue; // Already issued a diagnostic. 9959 9960 // Standard C says the enumerators have int type, but we allow, as an 9961 // extension, the enumerators to be larger than int size. If each 9962 // enumerator value fits in an int, type it as an int, otherwise type it the 9963 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9964 // that X has type 'int', not 'unsigned'. 9965 9966 // Determine whether the value fits into an int. 9967 llvm::APSInt InitVal = ECD->getInitVal(); 9968 9969 // If it fits into an integer type, force it. Otherwise force it to match 9970 // the enum decl type. 9971 QualType NewTy; 9972 unsigned NewWidth; 9973 bool NewSign; 9974 if (!getLangOptions().CPlusPlus && 9975 !Enum->isFixed() && 9976 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9977 NewTy = Context.IntTy; 9978 NewWidth = IntWidth; 9979 NewSign = true; 9980 } else if (ECD->getType() == BestType) { 9981 // Already the right type! 9982 if (getLangOptions().CPlusPlus) 9983 // C++ [dcl.enum]p4: Following the closing brace of an 9984 // enum-specifier, each enumerator has the type of its 9985 // enumeration. 9986 ECD->setType(EnumType); 9987 continue; 9988 } else { 9989 NewTy = BestType; 9990 NewWidth = BestWidth; 9991 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9992 } 9993 9994 // Adjust the APSInt value. 9995 InitVal = InitVal.extOrTrunc(NewWidth); 9996 InitVal.setIsSigned(NewSign); 9997 ECD->setInitVal(InitVal); 9998 9999 // Adjust the Expr initializer and type. 10000 if (ECD->getInitExpr() && 10001 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 10002 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 10003 CK_IntegralCast, 10004 ECD->getInitExpr(), 10005 /*base paths*/ 0, 10006 VK_RValue)); 10007 if (getLangOptions().CPlusPlus) 10008 // C++ [dcl.enum]p4: Following the closing brace of an 10009 // enum-specifier, each enumerator has the type of its 10010 // enumeration. 10011 ECD->setType(EnumType); 10012 else 10013 ECD->setType(NewTy); 10014 } 10015 10016 Enum->completeDefinition(BestType, BestPromotionType, 10017 NumPositiveBits, NumNegativeBits); 10018} 10019 10020Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 10021 SourceLocation StartLoc, 10022 SourceLocation EndLoc) { 10023 StringLiteral *AsmString = cast<StringLiteral>(expr); 10024 10025 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 10026 AsmString, StartLoc, 10027 EndLoc); 10028 CurContext->addDecl(New); 10029 return New; 10030} 10031 10032DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 10033 SourceLocation ImportLoc, 10034 ModuleIdPath Path) { 10035 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 10036 Module::AllVisible, 10037 /*IsIncludeDirective=*/false); 10038 if (!Mod) 10039 return true; 10040 10041 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 10042 Module *ModCheck = Mod; 10043 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 10044 // If we've run out of module parents, just drop the remaining identifiers. 10045 // We need the length to be consistent. 10046 if (!ModCheck) 10047 break; 10048 ModCheck = ModCheck->Parent; 10049 10050 IdentifierLocs.push_back(Path[I].second); 10051 } 10052 10053 ImportDecl *Import = ImportDecl::Create(Context, 10054 Context.getTranslationUnitDecl(), 10055 AtLoc.isValid()? AtLoc : ImportLoc, 10056 Mod, IdentifierLocs); 10057 Context.getTranslationUnitDecl()->addDecl(Import); 10058 return Import; 10059} 10060 10061void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 10062 SourceLocation PragmaLoc, 10063 SourceLocation NameLoc) { 10064 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 10065 10066 if (PrevDecl) { 10067 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 10068 } else { 10069 (void)WeakUndeclaredIdentifiers.insert( 10070 std::pair<IdentifierInfo*,WeakInfo> 10071 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10072 } 10073} 10074 10075void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10076 IdentifierInfo* AliasName, 10077 SourceLocation PragmaLoc, 10078 SourceLocation NameLoc, 10079 SourceLocation AliasNameLoc) { 10080 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10081 LookupOrdinaryName); 10082 WeakInfo W = WeakInfo(Name, NameLoc); 10083 10084 if (PrevDecl) { 10085 if (!PrevDecl->hasAttr<AliasAttr>()) 10086 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10087 DeclApplyPragmaWeak(TUScope, ND, W); 10088 } else { 10089 (void)WeakUndeclaredIdentifiers.insert( 10090 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10091 } 10092} 10093 10094Decl *Sema::getObjCDeclContext() const { 10095 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10096} 10097 10098AvailabilityResult Sema::getCurContextAvailability() const { 10099 const Decl *D = cast<Decl>(getCurLexicalContext()); 10100 // A category implicitly has the availability of the interface. 10101 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10102 D = CatD->getClassInterface(); 10103 10104 return D->getAvailability(); 10105} 10106