SemaDeclCXX.cpp revision cf5abc7ba032bd35158e4d75b0bc92a482fc67e8
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ 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 C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().Microsoft) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 if (CheckEquivalentExceptionSpec(Old, New)) 506 Invalid = true; 507 508 return Invalid; 509} 510 511/// \brief Merge the exception specifications of two variable declarations. 512/// 513/// This is called when there's a redeclaration of a VarDecl. The function 514/// checks if the redeclaration might have an exception specification and 515/// validates compatibility and merges the specs if necessary. 516void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 517 // Shortcut if exceptions are disabled. 518 if (!getLangOptions().CXXExceptions) 519 return; 520 521 assert(Context.hasSameType(New->getType(), Old->getType()) && 522 "Should only be called if types are otherwise the same."); 523 524 QualType NewType = New->getType(); 525 QualType OldType = Old->getType(); 526 527 // We're only interested in pointers and references to functions, as well 528 // as pointers to member functions. 529 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 530 NewType = R->getPointeeType(); 531 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 532 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 533 NewType = P->getPointeeType(); 534 OldType = OldType->getAs<PointerType>()->getPointeeType(); 535 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 536 NewType = M->getPointeeType(); 537 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 538 } 539 540 if (!NewType->isFunctionProtoType()) 541 return; 542 543 // There's lots of special cases for functions. For function pointers, system 544 // libraries are hopefully not as broken so that we don't need these 545 // workarounds. 546 if (CheckEquivalentExceptionSpec( 547 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 548 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 549 New->setInvalidDecl(); 550 } 551} 552 553/// CheckCXXDefaultArguments - Verify that the default arguments for a 554/// function declaration are well-formed according to C++ 555/// [dcl.fct.default]. 556void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 557 unsigned NumParams = FD->getNumParams(); 558 unsigned p; 559 560 // Find first parameter with a default argument 561 for (p = 0; p < NumParams; ++p) { 562 ParmVarDecl *Param = FD->getParamDecl(p); 563 if (Param->hasDefaultArg()) 564 break; 565 } 566 567 // C++ [dcl.fct.default]p4: 568 // In a given function declaration, all parameters 569 // subsequent to a parameter with a default argument shall 570 // have default arguments supplied in this or previous 571 // declarations. A default argument shall not be redefined 572 // by a later declaration (not even to the same value). 573 unsigned LastMissingDefaultArg = 0; 574 for (; p < NumParams; ++p) { 575 ParmVarDecl *Param = FD->getParamDecl(p); 576 if (!Param->hasDefaultArg()) { 577 if (Param->isInvalidDecl()) 578 /* We already complained about this parameter. */; 579 else if (Param->getIdentifier()) 580 Diag(Param->getLocation(), 581 diag::err_param_default_argument_missing_name) 582 << Param->getIdentifier(); 583 else 584 Diag(Param->getLocation(), 585 diag::err_param_default_argument_missing); 586 587 LastMissingDefaultArg = p; 588 } 589 } 590 591 if (LastMissingDefaultArg > 0) { 592 // Some default arguments were missing. Clear out all of the 593 // default arguments up to (and including) the last missing 594 // default argument, so that we leave the function parameters 595 // in a semantically valid state. 596 for (p = 0; p <= LastMissingDefaultArg; ++p) { 597 ParmVarDecl *Param = FD->getParamDecl(p); 598 if (Param->hasDefaultArg()) { 599 Param->setDefaultArg(0); 600 } 601 } 602 } 603} 604 605/// isCurrentClassName - Determine whether the identifier II is the 606/// name of the class type currently being defined. In the case of 607/// nested classes, this will only return true if II is the name of 608/// the innermost class. 609bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 610 const CXXScopeSpec *SS) { 611 assert(getLangOptions().CPlusPlus && "No class names in C!"); 612 613 CXXRecordDecl *CurDecl; 614 if (SS && SS->isSet() && !SS->isInvalid()) { 615 DeclContext *DC = computeDeclContext(*SS, true); 616 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 617 } else 618 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 619 620 if (CurDecl && CurDecl->getIdentifier()) 621 return &II == CurDecl->getIdentifier(); 622 else 623 return false; 624} 625 626/// \brief Check the validity of a C++ base class specifier. 627/// 628/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 629/// and returns NULL otherwise. 630CXXBaseSpecifier * 631Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 632 SourceRange SpecifierRange, 633 bool Virtual, AccessSpecifier Access, 634 TypeSourceInfo *TInfo, 635 SourceLocation EllipsisLoc) { 636 QualType BaseType = TInfo->getType(); 637 638 // C++ [class.union]p1: 639 // A union shall not have base classes. 640 if (Class->isUnion()) { 641 Diag(Class->getLocation(), diag::err_base_clause_on_union) 642 << SpecifierRange; 643 return 0; 644 } 645 646 if (EllipsisLoc.isValid() && 647 !TInfo->getType()->containsUnexpandedParameterPack()) { 648 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 649 << TInfo->getTypeLoc().getSourceRange(); 650 EllipsisLoc = SourceLocation(); 651 } 652 653 if (BaseType->isDependentType()) 654 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 655 Class->getTagKind() == TTK_Class, 656 Access, TInfo, EllipsisLoc); 657 658 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 659 660 // Base specifiers must be record types. 661 if (!BaseType->isRecordType()) { 662 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 663 return 0; 664 } 665 666 // C++ [class.union]p1: 667 // A union shall not be used as a base class. 668 if (BaseType->isUnionType()) { 669 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 670 return 0; 671 } 672 673 // C++ [class.derived]p2: 674 // The class-name in a base-specifier shall not be an incompletely 675 // defined class. 676 if (RequireCompleteType(BaseLoc, BaseType, 677 PDiag(diag::err_incomplete_base_class) 678 << SpecifierRange)) { 679 Class->setInvalidDecl(); 680 return 0; 681 } 682 683 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 684 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 685 assert(BaseDecl && "Record type has no declaration"); 686 BaseDecl = BaseDecl->getDefinition(); 687 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 688 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 689 assert(CXXBaseDecl && "Base type is not a C++ type"); 690 691 // C++ [class]p3: 692 // If a class is marked final and it appears as a base-type-specifier in 693 // base-clause, the program is ill-formed. 694 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 695 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 696 << CXXBaseDecl->getDeclName(); 697 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 698 << CXXBaseDecl->getDeclName(); 699 return 0; 700 } 701 702 if (BaseDecl->isInvalidDecl()) 703 Class->setInvalidDecl(); 704 705 // Create the base specifier. 706 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 707 Class->getTagKind() == TTK_Class, 708 Access, TInfo, EllipsisLoc); 709} 710 711/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 712/// one entry in the base class list of a class specifier, for 713/// example: 714/// class foo : public bar, virtual private baz { 715/// 'public bar' and 'virtual private baz' are each base-specifiers. 716BaseResult 717Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 718 bool Virtual, AccessSpecifier Access, 719 ParsedType basetype, SourceLocation BaseLoc, 720 SourceLocation EllipsisLoc) { 721 if (!classdecl) 722 return true; 723 724 AdjustDeclIfTemplate(classdecl); 725 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 726 if (!Class) 727 return true; 728 729 TypeSourceInfo *TInfo = 0; 730 GetTypeFromParser(basetype, &TInfo); 731 732 if (EllipsisLoc.isInvalid() && 733 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 734 UPPC_BaseType)) 735 return true; 736 737 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 738 Virtual, Access, TInfo, 739 EllipsisLoc)) 740 return BaseSpec; 741 742 return true; 743} 744 745/// \brief Performs the actual work of attaching the given base class 746/// specifiers to a C++ class. 747bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 748 unsigned NumBases) { 749 if (NumBases == 0) 750 return false; 751 752 // Used to keep track of which base types we have already seen, so 753 // that we can properly diagnose redundant direct base types. Note 754 // that the key is always the unqualified canonical type of the base 755 // class. 756 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 757 758 // Copy non-redundant base specifiers into permanent storage. 759 unsigned NumGoodBases = 0; 760 bool Invalid = false; 761 for (unsigned idx = 0; idx < NumBases; ++idx) { 762 QualType NewBaseType 763 = Context.getCanonicalType(Bases[idx]->getType()); 764 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 765 if (KnownBaseTypes[NewBaseType]) { 766 // C++ [class.mi]p3: 767 // A class shall not be specified as a direct base class of a 768 // derived class more than once. 769 Diag(Bases[idx]->getSourceRange().getBegin(), 770 diag::err_duplicate_base_class) 771 << KnownBaseTypes[NewBaseType]->getType() 772 << Bases[idx]->getSourceRange(); 773 774 // Delete the duplicate base class specifier; we're going to 775 // overwrite its pointer later. 776 Context.Deallocate(Bases[idx]); 777 778 Invalid = true; 779 } else { 780 // Okay, add this new base class. 781 KnownBaseTypes[NewBaseType] = Bases[idx]; 782 Bases[NumGoodBases++] = Bases[idx]; 783 } 784 } 785 786 // Attach the remaining base class specifiers to the derived class. 787 Class->setBases(Bases, NumGoodBases); 788 789 // Delete the remaining (good) base class specifiers, since their 790 // data has been copied into the CXXRecordDecl. 791 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 792 Context.Deallocate(Bases[idx]); 793 794 return Invalid; 795} 796 797/// ActOnBaseSpecifiers - Attach the given base specifiers to the 798/// class, after checking whether there are any duplicate base 799/// classes. 800void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 801 unsigned NumBases) { 802 if (!ClassDecl || !Bases || !NumBases) 803 return; 804 805 AdjustDeclIfTemplate(ClassDecl); 806 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 807 (CXXBaseSpecifier**)(Bases), NumBases); 808} 809 810static CXXRecordDecl *GetClassForType(QualType T) { 811 if (const RecordType *RT = T->getAs<RecordType>()) 812 return cast<CXXRecordDecl>(RT->getDecl()); 813 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 814 return ICT->getDecl(); 815 else 816 return 0; 817} 818 819/// \brief Determine whether the type \p Derived is a C++ class that is 820/// derived from the type \p Base. 821bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 822 if (!getLangOptions().CPlusPlus) 823 return false; 824 825 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 826 if (!DerivedRD) 827 return false; 828 829 CXXRecordDecl *BaseRD = GetClassForType(Base); 830 if (!BaseRD) 831 return false; 832 833 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 834 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 835} 836 837/// \brief Determine whether the type \p Derived is a C++ class that is 838/// derived from the type \p Base. 839bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 840 if (!getLangOptions().CPlusPlus) 841 return false; 842 843 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 844 if (!DerivedRD) 845 return false; 846 847 CXXRecordDecl *BaseRD = GetClassForType(Base); 848 if (!BaseRD) 849 return false; 850 851 return DerivedRD->isDerivedFrom(BaseRD, Paths); 852} 853 854void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 855 CXXCastPath &BasePathArray) { 856 assert(BasePathArray.empty() && "Base path array must be empty!"); 857 assert(Paths.isRecordingPaths() && "Must record paths!"); 858 859 const CXXBasePath &Path = Paths.front(); 860 861 // We first go backward and check if we have a virtual base. 862 // FIXME: It would be better if CXXBasePath had the base specifier for 863 // the nearest virtual base. 864 unsigned Start = 0; 865 for (unsigned I = Path.size(); I != 0; --I) { 866 if (Path[I - 1].Base->isVirtual()) { 867 Start = I - 1; 868 break; 869 } 870 } 871 872 // Now add all bases. 873 for (unsigned I = Start, E = Path.size(); I != E; ++I) 874 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 875} 876 877/// \brief Determine whether the given base path includes a virtual 878/// base class. 879bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 880 for (CXXCastPath::const_iterator B = BasePath.begin(), 881 BEnd = BasePath.end(); 882 B != BEnd; ++B) 883 if ((*B)->isVirtual()) 884 return true; 885 886 return false; 887} 888 889/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 890/// conversion (where Derived and Base are class types) is 891/// well-formed, meaning that the conversion is unambiguous (and 892/// that all of the base classes are accessible). Returns true 893/// and emits a diagnostic if the code is ill-formed, returns false 894/// otherwise. Loc is the location where this routine should point to 895/// if there is an error, and Range is the source range to highlight 896/// if there is an error. 897bool 898Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 899 unsigned InaccessibleBaseID, 900 unsigned AmbigiousBaseConvID, 901 SourceLocation Loc, SourceRange Range, 902 DeclarationName Name, 903 CXXCastPath *BasePath) { 904 // First, determine whether the path from Derived to Base is 905 // ambiguous. This is slightly more expensive than checking whether 906 // the Derived to Base conversion exists, because here we need to 907 // explore multiple paths to determine if there is an ambiguity. 908 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 909 /*DetectVirtual=*/false); 910 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 911 assert(DerivationOkay && 912 "Can only be used with a derived-to-base conversion"); 913 (void)DerivationOkay; 914 915 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 916 if (InaccessibleBaseID) { 917 // Check that the base class can be accessed. 918 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 919 InaccessibleBaseID)) { 920 case AR_inaccessible: 921 return true; 922 case AR_accessible: 923 case AR_dependent: 924 case AR_delayed: 925 break; 926 } 927 } 928 929 // Build a base path if necessary. 930 if (BasePath) 931 BuildBasePathArray(Paths, *BasePath); 932 return false; 933 } 934 935 // We know that the derived-to-base conversion is ambiguous, and 936 // we're going to produce a diagnostic. Perform the derived-to-base 937 // search just one more time to compute all of the possible paths so 938 // that we can print them out. This is more expensive than any of 939 // the previous derived-to-base checks we've done, but at this point 940 // performance isn't as much of an issue. 941 Paths.clear(); 942 Paths.setRecordingPaths(true); 943 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 944 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 945 (void)StillOkay; 946 947 // Build up a textual representation of the ambiguous paths, e.g., 948 // D -> B -> A, that will be used to illustrate the ambiguous 949 // conversions in the diagnostic. We only print one of the paths 950 // to each base class subobject. 951 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 952 953 Diag(Loc, AmbigiousBaseConvID) 954 << Derived << Base << PathDisplayStr << Range << Name; 955 return true; 956} 957 958bool 959Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 960 SourceLocation Loc, SourceRange Range, 961 CXXCastPath *BasePath, 962 bool IgnoreAccess) { 963 return CheckDerivedToBaseConversion(Derived, Base, 964 IgnoreAccess ? 0 965 : diag::err_upcast_to_inaccessible_base, 966 diag::err_ambiguous_derived_to_base_conv, 967 Loc, Range, DeclarationName(), 968 BasePath); 969} 970 971 972/// @brief Builds a string representing ambiguous paths from a 973/// specific derived class to different subobjects of the same base 974/// class. 975/// 976/// This function builds a string that can be used in error messages 977/// to show the different paths that one can take through the 978/// inheritance hierarchy to go from the derived class to different 979/// subobjects of a base class. The result looks something like this: 980/// @code 981/// struct D -> struct B -> struct A 982/// struct D -> struct C -> struct A 983/// @endcode 984std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 985 std::string PathDisplayStr; 986 std::set<unsigned> DisplayedPaths; 987 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 988 Path != Paths.end(); ++Path) { 989 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 990 // We haven't displayed a path to this particular base 991 // class subobject yet. 992 PathDisplayStr += "\n "; 993 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 994 for (CXXBasePath::const_iterator Element = Path->begin(); 995 Element != Path->end(); ++Element) 996 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 997 } 998 } 999 1000 return PathDisplayStr; 1001} 1002 1003//===----------------------------------------------------------------------===// 1004// C++ class member Handling 1005//===----------------------------------------------------------------------===// 1006 1007/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1008Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1009 SourceLocation ASLoc, 1010 SourceLocation ColonLoc) { 1011 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1012 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1013 ASLoc, ColonLoc); 1014 CurContext->addHiddenDecl(ASDecl); 1015 return ASDecl; 1016} 1017 1018/// CheckOverrideControl - Check C++0x override control semantics. 1019void Sema::CheckOverrideControl(const Decl *D) { 1020 const CXXMethodDecl *MD = llvm::dyn_cast<CXXMethodDecl>(D); 1021 if (!MD || !MD->isVirtual()) 1022 return; 1023 1024 if (MD->isDependentContext()) 1025 return; 1026 1027 // C++0x [class.virtual]p3: 1028 // If a virtual function is marked with the virt-specifier override and does 1029 // not override a member function of a base class, 1030 // the program is ill-formed. 1031 bool HasOverriddenMethods = 1032 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1033 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1034 Diag(MD->getLocation(), 1035 diag::err_function_marked_override_not_overriding) 1036 << MD->getDeclName(); 1037 return; 1038 } 1039} 1040 1041/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1042/// function overrides a virtual member function marked 'final', according to 1043/// C++0x [class.virtual]p3. 1044bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1045 const CXXMethodDecl *Old) { 1046 if (!Old->hasAttr<FinalAttr>()) 1047 return false; 1048 1049 Diag(New->getLocation(), diag::err_final_function_overridden) 1050 << New->getDeclName(); 1051 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1052 return true; 1053} 1054 1055/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1056/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1057/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1058/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1059/// present but parsing it has been deferred. 1060Decl * 1061Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1062 MultiTemplateParamsArg TemplateParameterLists, 1063 ExprTy *BW, const VirtSpecifiers &VS, 1064 ExprTy *InitExpr, bool HasDeferredInit, 1065 bool IsDefinition) { 1066 const DeclSpec &DS = D.getDeclSpec(); 1067 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1068 DeclarationName Name = NameInfo.getName(); 1069 SourceLocation Loc = NameInfo.getLoc(); 1070 1071 // For anonymous bitfields, the location should point to the type. 1072 if (Loc.isInvalid()) 1073 Loc = D.getSourceRange().getBegin(); 1074 1075 Expr *BitWidth = static_cast<Expr*>(BW); 1076 Expr *Init = static_cast<Expr*>(InitExpr); 1077 1078 assert(isa<CXXRecordDecl>(CurContext)); 1079 assert(!DS.isFriendSpecified()); 1080 assert(!Init || !HasDeferredInit); 1081 1082 bool isFunc = false; 1083 if (D.isFunctionDeclarator()) 1084 isFunc = true; 1085 else if (D.getNumTypeObjects() == 0 && 1086 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename) { 1087 QualType TDType = GetTypeFromParser(DS.getRepAsType()); 1088 isFunc = TDType->isFunctionType(); 1089 } 1090 1091 // C++ 9.2p6: A member shall not be declared to have automatic storage 1092 // duration (auto, register) or with the extern storage-class-specifier. 1093 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1094 // data members and cannot be applied to names declared const or static, 1095 // and cannot be applied to reference members. 1096 switch (DS.getStorageClassSpec()) { 1097 case DeclSpec::SCS_unspecified: 1098 case DeclSpec::SCS_typedef: 1099 case DeclSpec::SCS_static: 1100 // FALL THROUGH. 1101 break; 1102 case DeclSpec::SCS_mutable: 1103 if (isFunc) { 1104 if (DS.getStorageClassSpecLoc().isValid()) 1105 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1106 else 1107 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1108 1109 // FIXME: It would be nicer if the keyword was ignored only for this 1110 // declarator. Otherwise we could get follow-up errors. 1111 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1112 } 1113 break; 1114 default: 1115 if (DS.getStorageClassSpecLoc().isValid()) 1116 Diag(DS.getStorageClassSpecLoc(), 1117 diag::err_storageclass_invalid_for_member); 1118 else 1119 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1120 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1121 } 1122 1123 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1124 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1125 !isFunc); 1126 1127 Decl *Member; 1128 if (isInstField) { 1129 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1130 1131 if (SS.isSet() && !SS.isInvalid()) { 1132 // The user provided a superfluous scope specifier inside a class 1133 // definition: 1134 // 1135 // class X { 1136 // int X::member; 1137 // }; 1138 DeclContext *DC = 0; 1139 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1140 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1141 << Name << FixItHint::CreateRemoval(SS.getRange()); 1142 else 1143 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1144 << Name << SS.getRange(); 1145 1146 SS.clear(); 1147 } 1148 1149 // FIXME: Check for template parameters! 1150 // FIXME: Check that the name is an identifier! 1151 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1152 HasDeferredInit, AS); 1153 assert(Member && "HandleField never returns null"); 1154 } else { 1155 assert(!HasDeferredInit); 1156 1157 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1158 if (!Member) { 1159 return 0; 1160 } 1161 1162 // Non-instance-fields can't have a bitfield. 1163 if (BitWidth) { 1164 if (Member->isInvalidDecl()) { 1165 // don't emit another diagnostic. 1166 } else if (isa<VarDecl>(Member)) { 1167 // C++ 9.6p3: A bit-field shall not be a static member. 1168 // "static member 'A' cannot be a bit-field" 1169 Diag(Loc, diag::err_static_not_bitfield) 1170 << Name << BitWidth->getSourceRange(); 1171 } else if (isa<TypedefDecl>(Member)) { 1172 // "typedef member 'x' cannot be a bit-field" 1173 Diag(Loc, diag::err_typedef_not_bitfield) 1174 << Name << BitWidth->getSourceRange(); 1175 } else { 1176 // A function typedef ("typedef int f(); f a;"). 1177 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1178 Diag(Loc, diag::err_not_integral_type_bitfield) 1179 << Name << cast<ValueDecl>(Member)->getType() 1180 << BitWidth->getSourceRange(); 1181 } 1182 1183 BitWidth = 0; 1184 Member->setInvalidDecl(); 1185 } 1186 1187 Member->setAccess(AS); 1188 1189 // If we have declared a member function template, set the access of the 1190 // templated declaration as well. 1191 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1192 FunTmpl->getTemplatedDecl()->setAccess(AS); 1193 } 1194 1195 if (VS.isOverrideSpecified()) { 1196 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1197 if (!MD || !MD->isVirtual()) { 1198 Diag(Member->getLocStart(), 1199 diag::override_keyword_only_allowed_on_virtual_member_functions) 1200 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1201 } else 1202 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1203 } 1204 if (VS.isFinalSpecified()) { 1205 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1206 if (!MD || !MD->isVirtual()) { 1207 Diag(Member->getLocStart(), 1208 diag::override_keyword_only_allowed_on_virtual_member_functions) 1209 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1210 } else 1211 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1212 } 1213 1214 if (VS.getLastLocation().isValid()) { 1215 // Update the end location of a method that has a virt-specifiers. 1216 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1217 MD->setRangeEnd(VS.getLastLocation()); 1218 } 1219 1220 CheckOverrideControl(Member); 1221 1222 assert((Name || isInstField) && "No identifier for non-field ?"); 1223 1224 if (Init) 1225 AddInitializerToDecl(Member, Init, false, 1226 DS.getTypeSpecType() == DeclSpec::TST_auto); 1227 else if (DS.getTypeSpecType() == DeclSpec::TST_auto && 1228 DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1229 // C++0x [dcl.spec.auto]p4: 'auto' can only be used in the type of a static 1230 // data member if a brace-or-equal-initializer is provided. 1231 Diag(Loc, diag::err_auto_var_requires_init) 1232 << Name << cast<ValueDecl>(Member)->getType(); 1233 Member->setInvalidDecl(); 1234 } 1235 1236 FinalizeDeclaration(Member); 1237 1238 if (isInstField) 1239 FieldCollector->Add(cast<FieldDecl>(Member)); 1240 return Member; 1241} 1242 1243/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1244/// in-class initializer for a non-static C++ class member. Such parsing 1245/// is deferred until the class is complete. 1246void 1247Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1248 Expr *InitExpr) { 1249 FieldDecl *FD = cast<FieldDecl>(D); 1250 1251 if (!InitExpr) { 1252 FD->setInvalidDecl(); 1253 FD->removeInClassInitializer(); 1254 return; 1255 } 1256 1257 ExprResult Init = InitExpr; 1258 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1259 // FIXME: if there is no EqualLoc, this is list-initialization. 1260 Init = PerformCopyInitialization( 1261 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1262 if (Init.isInvalid()) { 1263 FD->setInvalidDecl(); 1264 return; 1265 } 1266 1267 CheckImplicitConversions(Init.get(), EqualLoc); 1268 } 1269 1270 // C++0x [class.base.init]p7: 1271 // The initialization of each base and member constitutes a 1272 // full-expression. 1273 Init = MaybeCreateExprWithCleanups(Init); 1274 if (Init.isInvalid()) { 1275 FD->setInvalidDecl(); 1276 return; 1277 } 1278 1279 InitExpr = Init.release(); 1280 1281 FD->setInClassInitializer(InitExpr); 1282} 1283 1284/// \brief Find the direct and/or virtual base specifiers that 1285/// correspond to the given base type, for use in base initialization 1286/// within a constructor. 1287static bool FindBaseInitializer(Sema &SemaRef, 1288 CXXRecordDecl *ClassDecl, 1289 QualType BaseType, 1290 const CXXBaseSpecifier *&DirectBaseSpec, 1291 const CXXBaseSpecifier *&VirtualBaseSpec) { 1292 // First, check for a direct base class. 1293 DirectBaseSpec = 0; 1294 for (CXXRecordDecl::base_class_const_iterator Base 1295 = ClassDecl->bases_begin(); 1296 Base != ClassDecl->bases_end(); ++Base) { 1297 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1298 // We found a direct base of this type. That's what we're 1299 // initializing. 1300 DirectBaseSpec = &*Base; 1301 break; 1302 } 1303 } 1304 1305 // Check for a virtual base class. 1306 // FIXME: We might be able to short-circuit this if we know in advance that 1307 // there are no virtual bases. 1308 VirtualBaseSpec = 0; 1309 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1310 // We haven't found a base yet; search the class hierarchy for a 1311 // virtual base class. 1312 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1313 /*DetectVirtual=*/false); 1314 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1315 BaseType, Paths)) { 1316 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1317 Path != Paths.end(); ++Path) { 1318 if (Path->back().Base->isVirtual()) { 1319 VirtualBaseSpec = Path->back().Base; 1320 break; 1321 } 1322 } 1323 } 1324 } 1325 1326 return DirectBaseSpec || VirtualBaseSpec; 1327} 1328 1329/// ActOnMemInitializer - Handle a C++ member initializer. 1330MemInitResult 1331Sema::ActOnMemInitializer(Decl *ConstructorD, 1332 Scope *S, 1333 CXXScopeSpec &SS, 1334 IdentifierInfo *MemberOrBase, 1335 ParsedType TemplateTypeTy, 1336 SourceLocation IdLoc, 1337 SourceLocation LParenLoc, 1338 ExprTy **Args, unsigned NumArgs, 1339 SourceLocation RParenLoc, 1340 SourceLocation EllipsisLoc) { 1341 if (!ConstructorD) 1342 return true; 1343 1344 AdjustDeclIfTemplate(ConstructorD); 1345 1346 CXXConstructorDecl *Constructor 1347 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1348 if (!Constructor) { 1349 // The user wrote a constructor initializer on a function that is 1350 // not a C++ constructor. Ignore the error for now, because we may 1351 // have more member initializers coming; we'll diagnose it just 1352 // once in ActOnMemInitializers. 1353 return true; 1354 } 1355 1356 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1357 1358 // C++ [class.base.init]p2: 1359 // Names in a mem-initializer-id are looked up in the scope of the 1360 // constructor's class and, if not found in that scope, are looked 1361 // up in the scope containing the constructor's definition. 1362 // [Note: if the constructor's class contains a member with the 1363 // same name as a direct or virtual base class of the class, a 1364 // mem-initializer-id naming the member or base class and composed 1365 // of a single identifier refers to the class member. A 1366 // mem-initializer-id for the hidden base class may be specified 1367 // using a qualified name. ] 1368 if (!SS.getScopeRep() && !TemplateTypeTy) { 1369 // Look for a member, first. 1370 FieldDecl *Member = 0; 1371 DeclContext::lookup_result Result 1372 = ClassDecl->lookup(MemberOrBase); 1373 if (Result.first != Result.second) { 1374 Member = dyn_cast<FieldDecl>(*Result.first); 1375 1376 if (Member) { 1377 if (EllipsisLoc.isValid()) 1378 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1379 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1380 1381 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1382 LParenLoc, RParenLoc); 1383 } 1384 1385 // Handle anonymous union case. 1386 if (IndirectFieldDecl* IndirectField 1387 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1388 if (EllipsisLoc.isValid()) 1389 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1390 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1391 1392 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1393 NumArgs, IdLoc, 1394 LParenLoc, RParenLoc); 1395 } 1396 } 1397 } 1398 // It didn't name a member, so see if it names a class. 1399 QualType BaseType; 1400 TypeSourceInfo *TInfo = 0; 1401 1402 if (TemplateTypeTy) { 1403 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1404 } else { 1405 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1406 LookupParsedName(R, S, &SS); 1407 1408 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1409 if (!TyD) { 1410 if (R.isAmbiguous()) return true; 1411 1412 // We don't want access-control diagnostics here. 1413 R.suppressDiagnostics(); 1414 1415 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1416 bool NotUnknownSpecialization = false; 1417 DeclContext *DC = computeDeclContext(SS, false); 1418 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1419 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1420 1421 if (!NotUnknownSpecialization) { 1422 // When the scope specifier can refer to a member of an unknown 1423 // specialization, we take it as a type name. 1424 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1425 SS.getWithLocInContext(Context), 1426 *MemberOrBase, IdLoc); 1427 if (BaseType.isNull()) 1428 return true; 1429 1430 R.clear(); 1431 R.setLookupName(MemberOrBase); 1432 } 1433 } 1434 1435 // If no results were found, try to correct typos. 1436 if (R.empty() && BaseType.isNull() && 1437 CorrectTypo(R, S, &SS, ClassDecl, 0, CTC_NoKeywords) && 1438 R.isSingleResult()) { 1439 if (FieldDecl *Member = R.getAsSingle<FieldDecl>()) { 1440 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1441 // We have found a non-static data member with a similar 1442 // name to what was typed; complain and initialize that 1443 // member. 1444 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1445 << MemberOrBase << true << R.getLookupName() 1446 << FixItHint::CreateReplacement(R.getNameLoc(), 1447 R.getLookupName().getAsString()); 1448 Diag(Member->getLocation(), diag::note_previous_decl) 1449 << Member->getDeclName(); 1450 1451 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1452 LParenLoc, RParenLoc); 1453 } 1454 } else if (TypeDecl *Type = R.getAsSingle<TypeDecl>()) { 1455 const CXXBaseSpecifier *DirectBaseSpec; 1456 const CXXBaseSpecifier *VirtualBaseSpec; 1457 if (FindBaseInitializer(*this, ClassDecl, 1458 Context.getTypeDeclType(Type), 1459 DirectBaseSpec, VirtualBaseSpec)) { 1460 // We have found a direct or virtual base class with a 1461 // similar name to what was typed; complain and initialize 1462 // that base class. 1463 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1464 << MemberOrBase << false << R.getLookupName() 1465 << FixItHint::CreateReplacement(R.getNameLoc(), 1466 R.getLookupName().getAsString()); 1467 1468 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1469 : VirtualBaseSpec; 1470 Diag(BaseSpec->getSourceRange().getBegin(), 1471 diag::note_base_class_specified_here) 1472 << BaseSpec->getType() 1473 << BaseSpec->getSourceRange(); 1474 1475 TyD = Type; 1476 } 1477 } 1478 } 1479 1480 if (!TyD && BaseType.isNull()) { 1481 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1482 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1483 return true; 1484 } 1485 } 1486 1487 if (BaseType.isNull()) { 1488 BaseType = Context.getTypeDeclType(TyD); 1489 if (SS.isSet()) { 1490 NestedNameSpecifier *Qualifier = 1491 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1492 1493 // FIXME: preserve source range information 1494 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1495 } 1496 } 1497 } 1498 1499 if (!TInfo) 1500 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1501 1502 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1503 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1504} 1505 1506/// Checks an initializer expression for use of uninitialized fields, such as 1507/// containing the field that is being initialized. Returns true if there is an 1508/// uninitialized field was used an updates the SourceLocation parameter; false 1509/// otherwise. 1510static bool InitExprContainsUninitializedFields(const Stmt *S, 1511 const ValueDecl *LhsField, 1512 SourceLocation *L) { 1513 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1514 1515 if (isa<CallExpr>(S)) { 1516 // Do not descend into function calls or constructors, as the use 1517 // of an uninitialized field may be valid. One would have to inspect 1518 // the contents of the function/ctor to determine if it is safe or not. 1519 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1520 // may be safe, depending on what the function/ctor does. 1521 return false; 1522 } 1523 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1524 const NamedDecl *RhsField = ME->getMemberDecl(); 1525 1526 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1527 // The member expression points to a static data member. 1528 assert(VD->isStaticDataMember() && 1529 "Member points to non-static data member!"); 1530 (void)VD; 1531 return false; 1532 } 1533 1534 if (isa<EnumConstantDecl>(RhsField)) { 1535 // The member expression points to an enum. 1536 return false; 1537 } 1538 1539 if (RhsField == LhsField) { 1540 // Initializing a field with itself. Throw a warning. 1541 // But wait; there are exceptions! 1542 // Exception #1: The field may not belong to this record. 1543 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1544 const Expr *base = ME->getBase(); 1545 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1546 // Even though the field matches, it does not belong to this record. 1547 return false; 1548 } 1549 // None of the exceptions triggered; return true to indicate an 1550 // uninitialized field was used. 1551 *L = ME->getMemberLoc(); 1552 return true; 1553 } 1554 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1555 // sizeof/alignof doesn't reference contents, do not warn. 1556 return false; 1557 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1558 // address-of doesn't reference contents (the pointer may be dereferenced 1559 // in the same expression but it would be rare; and weird). 1560 if (UOE->getOpcode() == UO_AddrOf) 1561 return false; 1562 } 1563 for (Stmt::const_child_range it = S->children(); it; ++it) { 1564 if (!*it) { 1565 // An expression such as 'member(arg ?: "")' may trigger this. 1566 continue; 1567 } 1568 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1569 return true; 1570 } 1571 return false; 1572} 1573 1574MemInitResult 1575Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1576 unsigned NumArgs, SourceLocation IdLoc, 1577 SourceLocation LParenLoc, 1578 SourceLocation RParenLoc) { 1579 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1580 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1581 assert((DirectMember || IndirectMember) && 1582 "Member must be a FieldDecl or IndirectFieldDecl"); 1583 1584 if (Member->isInvalidDecl()) 1585 return true; 1586 1587 // Diagnose value-uses of fields to initialize themselves, e.g. 1588 // foo(foo) 1589 // where foo is not also a parameter to the constructor. 1590 // TODO: implement -Wuninitialized and fold this into that framework. 1591 for (unsigned i = 0; i < NumArgs; ++i) { 1592 SourceLocation L; 1593 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1594 // FIXME: Return true in the case when other fields are used before being 1595 // uninitialized. For example, let this field be the i'th field. When 1596 // initializing the i'th field, throw a warning if any of the >= i'th 1597 // fields are used, as they are not yet initialized. 1598 // Right now we are only handling the case where the i'th field uses 1599 // itself in its initializer. 1600 Diag(L, diag::warn_field_is_uninit); 1601 } 1602 } 1603 1604 bool HasDependentArg = false; 1605 for (unsigned i = 0; i < NumArgs; i++) 1606 HasDependentArg |= Args[i]->isTypeDependent(); 1607 1608 Expr *Init; 1609 if (Member->getType()->isDependentType() || HasDependentArg) { 1610 // Can't check initialization for a member of dependent type or when 1611 // any of the arguments are type-dependent expressions. 1612 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1613 RParenLoc, 1614 Member->getType().getNonReferenceType()); 1615 1616 DiscardCleanupsInEvaluationContext(); 1617 } else { 1618 // Initialize the member. 1619 InitializedEntity MemberEntity = 1620 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1621 : InitializedEntity::InitializeMember(IndirectMember, 0); 1622 InitializationKind Kind = 1623 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1624 1625 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1626 1627 ExprResult MemberInit = 1628 InitSeq.Perform(*this, MemberEntity, Kind, 1629 MultiExprArg(*this, Args, NumArgs), 0); 1630 if (MemberInit.isInvalid()) 1631 return true; 1632 1633 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1634 1635 // C++0x [class.base.init]p7: 1636 // The initialization of each base and member constitutes a 1637 // full-expression. 1638 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1639 if (MemberInit.isInvalid()) 1640 return true; 1641 1642 // If we are in a dependent context, template instantiation will 1643 // perform this type-checking again. Just save the arguments that we 1644 // received in a ParenListExpr. 1645 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1646 // of the information that we have about the member 1647 // initializer. However, deconstructing the ASTs is a dicey process, 1648 // and this approach is far more likely to get the corner cases right. 1649 if (CurContext->isDependentContext()) 1650 Init = new (Context) ParenListExpr( 1651 Context, LParenLoc, Args, NumArgs, RParenLoc, 1652 Member->getType().getNonReferenceType()); 1653 else 1654 Init = MemberInit.get(); 1655 } 1656 1657 if (DirectMember) { 1658 return new (Context) CXXCtorInitializer(Context, DirectMember, 1659 IdLoc, LParenLoc, Init, 1660 RParenLoc); 1661 } else { 1662 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1663 IdLoc, LParenLoc, Init, 1664 RParenLoc); 1665 } 1666} 1667 1668MemInitResult 1669Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1670 Expr **Args, unsigned NumArgs, 1671 SourceLocation NameLoc, 1672 SourceLocation LParenLoc, 1673 SourceLocation RParenLoc, 1674 CXXRecordDecl *ClassDecl) { 1675 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1676 if (!LangOpts.CPlusPlus0x) 1677 return Diag(Loc, diag::err_delegation_0x_only) 1678 << TInfo->getTypeLoc().getLocalSourceRange(); 1679 1680 // Initialize the object. 1681 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1682 QualType(ClassDecl->getTypeForDecl(), 0)); 1683 InitializationKind Kind = 1684 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1685 1686 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1687 1688 ExprResult DelegationInit = 1689 InitSeq.Perform(*this, DelegationEntity, Kind, 1690 MultiExprArg(*this, Args, NumArgs), 0); 1691 if (DelegationInit.isInvalid()) 1692 return true; 1693 1694 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1695 CXXConstructorDecl *Constructor 1696 = ConExpr->getConstructor(); 1697 assert(Constructor && "Delegating constructor with no target?"); 1698 1699 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1700 1701 // C++0x [class.base.init]p7: 1702 // The initialization of each base and member constitutes a 1703 // full-expression. 1704 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1705 if (DelegationInit.isInvalid()) 1706 return true; 1707 1708 assert(!CurContext->isDependentContext()); 1709 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1710 DelegationInit.takeAs<Expr>(), 1711 RParenLoc); 1712} 1713 1714MemInitResult 1715Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1716 Expr **Args, unsigned NumArgs, 1717 SourceLocation LParenLoc, SourceLocation RParenLoc, 1718 CXXRecordDecl *ClassDecl, 1719 SourceLocation EllipsisLoc) { 1720 bool HasDependentArg = false; 1721 for (unsigned i = 0; i < NumArgs; i++) 1722 HasDependentArg |= Args[i]->isTypeDependent(); 1723 1724 SourceLocation BaseLoc 1725 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1726 1727 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1728 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1729 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1730 1731 // C++ [class.base.init]p2: 1732 // [...] Unless the mem-initializer-id names a nonstatic data 1733 // member of the constructor's class or a direct or virtual base 1734 // of that class, the mem-initializer is ill-formed. A 1735 // mem-initializer-list can initialize a base class using any 1736 // name that denotes that base class type. 1737 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1738 1739 if (EllipsisLoc.isValid()) { 1740 // This is a pack expansion. 1741 if (!BaseType->containsUnexpandedParameterPack()) { 1742 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1743 << SourceRange(BaseLoc, RParenLoc); 1744 1745 EllipsisLoc = SourceLocation(); 1746 } 1747 } else { 1748 // Check for any unexpanded parameter packs. 1749 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1750 return true; 1751 1752 for (unsigned I = 0; I != NumArgs; ++I) 1753 if (DiagnoseUnexpandedParameterPack(Args[I])) 1754 return true; 1755 } 1756 1757 // Check for direct and virtual base classes. 1758 const CXXBaseSpecifier *DirectBaseSpec = 0; 1759 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1760 if (!Dependent) { 1761 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1762 BaseType)) 1763 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1764 LParenLoc, RParenLoc, ClassDecl); 1765 1766 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1767 VirtualBaseSpec); 1768 1769 // C++ [base.class.init]p2: 1770 // Unless the mem-initializer-id names a nonstatic data member of the 1771 // constructor's class or a direct or virtual base of that class, the 1772 // mem-initializer is ill-formed. 1773 if (!DirectBaseSpec && !VirtualBaseSpec) { 1774 // If the class has any dependent bases, then it's possible that 1775 // one of those types will resolve to the same type as 1776 // BaseType. Therefore, just treat this as a dependent base 1777 // class initialization. FIXME: Should we try to check the 1778 // initialization anyway? It seems odd. 1779 if (ClassDecl->hasAnyDependentBases()) 1780 Dependent = true; 1781 else 1782 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1783 << BaseType << Context.getTypeDeclType(ClassDecl) 1784 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1785 } 1786 } 1787 1788 if (Dependent) { 1789 // Can't check initialization for a base of dependent type or when 1790 // any of the arguments are type-dependent expressions. 1791 ExprResult BaseInit 1792 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1793 RParenLoc, BaseType)); 1794 1795 DiscardCleanupsInEvaluationContext(); 1796 1797 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1798 /*IsVirtual=*/false, 1799 LParenLoc, 1800 BaseInit.takeAs<Expr>(), 1801 RParenLoc, 1802 EllipsisLoc); 1803 } 1804 1805 // C++ [base.class.init]p2: 1806 // If a mem-initializer-id is ambiguous because it designates both 1807 // a direct non-virtual base class and an inherited virtual base 1808 // class, the mem-initializer is ill-formed. 1809 if (DirectBaseSpec && VirtualBaseSpec) 1810 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1811 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1812 1813 CXXBaseSpecifier *BaseSpec 1814 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1815 if (!BaseSpec) 1816 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1817 1818 // Initialize the base. 1819 InitializedEntity BaseEntity = 1820 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1821 InitializationKind Kind = 1822 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1823 1824 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1825 1826 ExprResult BaseInit = 1827 InitSeq.Perform(*this, BaseEntity, Kind, 1828 MultiExprArg(*this, Args, NumArgs), 0); 1829 if (BaseInit.isInvalid()) 1830 return true; 1831 1832 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1833 1834 // C++0x [class.base.init]p7: 1835 // The initialization of each base and member constitutes a 1836 // full-expression. 1837 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1838 if (BaseInit.isInvalid()) 1839 return true; 1840 1841 // If we are in a dependent context, template instantiation will 1842 // perform this type-checking again. Just save the arguments that we 1843 // received in a ParenListExpr. 1844 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1845 // of the information that we have about the base 1846 // initializer. However, deconstructing the ASTs is a dicey process, 1847 // and this approach is far more likely to get the corner cases right. 1848 if (CurContext->isDependentContext()) { 1849 ExprResult Init 1850 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1851 RParenLoc, BaseType)); 1852 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1853 BaseSpec->isVirtual(), 1854 LParenLoc, 1855 Init.takeAs<Expr>(), 1856 RParenLoc, 1857 EllipsisLoc); 1858 } 1859 1860 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1861 BaseSpec->isVirtual(), 1862 LParenLoc, 1863 BaseInit.takeAs<Expr>(), 1864 RParenLoc, 1865 EllipsisLoc); 1866} 1867 1868/// ImplicitInitializerKind - How an implicit base or member initializer should 1869/// initialize its base or member. 1870enum ImplicitInitializerKind { 1871 IIK_Default, 1872 IIK_Copy, 1873 IIK_Move 1874}; 1875 1876static bool 1877BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1878 ImplicitInitializerKind ImplicitInitKind, 1879 CXXBaseSpecifier *BaseSpec, 1880 bool IsInheritedVirtualBase, 1881 CXXCtorInitializer *&CXXBaseInit) { 1882 InitializedEntity InitEntity 1883 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1884 IsInheritedVirtualBase); 1885 1886 ExprResult BaseInit; 1887 1888 switch (ImplicitInitKind) { 1889 case IIK_Default: { 1890 InitializationKind InitKind 1891 = InitializationKind::CreateDefault(Constructor->getLocation()); 1892 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1893 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1894 MultiExprArg(SemaRef, 0, 0)); 1895 break; 1896 } 1897 1898 case IIK_Copy: { 1899 ParmVarDecl *Param = Constructor->getParamDecl(0); 1900 QualType ParamType = Param->getType().getNonReferenceType(); 1901 1902 Expr *CopyCtorArg = 1903 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1904 Constructor->getLocation(), ParamType, 1905 VK_LValue, 0); 1906 1907 // Cast to the base class to avoid ambiguities. 1908 QualType ArgTy = 1909 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1910 ParamType.getQualifiers()); 1911 1912 CXXCastPath BasePath; 1913 BasePath.push_back(BaseSpec); 1914 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1915 CK_UncheckedDerivedToBase, 1916 VK_LValue, &BasePath).take(); 1917 1918 InitializationKind InitKind 1919 = InitializationKind::CreateDirect(Constructor->getLocation(), 1920 SourceLocation(), SourceLocation()); 1921 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1922 &CopyCtorArg, 1); 1923 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1924 MultiExprArg(&CopyCtorArg, 1)); 1925 break; 1926 } 1927 1928 case IIK_Move: 1929 assert(false && "Unhandled initializer kind!"); 1930 } 1931 1932 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1933 if (BaseInit.isInvalid()) 1934 return true; 1935 1936 CXXBaseInit = 1937 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1938 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1939 SourceLocation()), 1940 BaseSpec->isVirtual(), 1941 SourceLocation(), 1942 BaseInit.takeAs<Expr>(), 1943 SourceLocation(), 1944 SourceLocation()); 1945 1946 return false; 1947} 1948 1949static bool 1950BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1951 ImplicitInitializerKind ImplicitInitKind, 1952 FieldDecl *Field, 1953 CXXCtorInitializer *&CXXMemberInit) { 1954 if (Field->isInvalidDecl()) 1955 return true; 1956 1957 SourceLocation Loc = Constructor->getLocation(); 1958 1959 if (ImplicitInitKind == IIK_Copy) { 1960 ParmVarDecl *Param = Constructor->getParamDecl(0); 1961 QualType ParamType = Param->getType().getNonReferenceType(); 1962 1963 // Suppress copying zero-width bitfields. 1964 if (const Expr *Width = Field->getBitWidth()) 1965 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 1966 return false; 1967 1968 Expr *MemberExprBase = 1969 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1970 Loc, ParamType, VK_LValue, 0); 1971 1972 // Build a reference to this field within the parameter. 1973 CXXScopeSpec SS; 1974 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1975 Sema::LookupMemberName); 1976 MemberLookup.addDecl(Field, AS_public); 1977 MemberLookup.resolveKind(); 1978 ExprResult CopyCtorArg 1979 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1980 ParamType, Loc, 1981 /*IsArrow=*/false, 1982 SS, 1983 /*FirstQualifierInScope=*/0, 1984 MemberLookup, 1985 /*TemplateArgs=*/0); 1986 if (CopyCtorArg.isInvalid()) 1987 return true; 1988 1989 // When the field we are copying is an array, create index variables for 1990 // each dimension of the array. We use these index variables to subscript 1991 // the source array, and other clients (e.g., CodeGen) will perform the 1992 // necessary iteration with these index variables. 1993 llvm::SmallVector<VarDecl *, 4> IndexVariables; 1994 QualType BaseType = Field->getType(); 1995 QualType SizeType = SemaRef.Context.getSizeType(); 1996 while (const ConstantArrayType *Array 1997 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1998 // Create the iteration variable for this array index. 1999 IdentifierInfo *IterationVarName = 0; 2000 { 2001 llvm::SmallString<8> Str; 2002 llvm::raw_svector_ostream OS(Str); 2003 OS << "__i" << IndexVariables.size(); 2004 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2005 } 2006 VarDecl *IterationVar 2007 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2008 IterationVarName, SizeType, 2009 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2010 SC_None, SC_None); 2011 IndexVariables.push_back(IterationVar); 2012 2013 // Create a reference to the iteration variable. 2014 ExprResult IterationVarRef 2015 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2016 assert(!IterationVarRef.isInvalid() && 2017 "Reference to invented variable cannot fail!"); 2018 2019 // Subscript the array with this iteration variable. 2020 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 2021 Loc, 2022 IterationVarRef.take(), 2023 Loc); 2024 if (CopyCtorArg.isInvalid()) 2025 return true; 2026 2027 BaseType = Array->getElementType(); 2028 } 2029 2030 // Construct the entity that we will be initializing. For an array, this 2031 // will be first element in the array, which may require several levels 2032 // of array-subscript entities. 2033 llvm::SmallVector<InitializedEntity, 4> Entities; 2034 Entities.reserve(1 + IndexVariables.size()); 2035 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2036 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2037 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2038 0, 2039 Entities.back())); 2040 2041 // Direct-initialize to use the copy constructor. 2042 InitializationKind InitKind = 2043 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2044 2045 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 2046 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2047 &CopyCtorArgE, 1); 2048 2049 ExprResult MemberInit 2050 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2051 MultiExprArg(&CopyCtorArgE, 1)); 2052 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2053 if (MemberInit.isInvalid()) 2054 return true; 2055 2056 CXXMemberInit 2057 = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, Loc, 2058 MemberInit.takeAs<Expr>(), Loc, 2059 IndexVariables.data(), 2060 IndexVariables.size()); 2061 return false; 2062 } 2063 2064 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2065 2066 QualType FieldBaseElementType = 2067 SemaRef.Context.getBaseElementType(Field->getType()); 2068 2069 if (FieldBaseElementType->isRecordType()) { 2070 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 2071 InitializationKind InitKind = 2072 InitializationKind::CreateDefault(Loc); 2073 2074 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2075 ExprResult MemberInit = 2076 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2077 2078 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2079 if (MemberInit.isInvalid()) 2080 return true; 2081 2082 CXXMemberInit = 2083 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2084 Field, Loc, Loc, 2085 MemberInit.get(), 2086 Loc); 2087 return false; 2088 } 2089 2090 if (!Field->getParent()->isUnion()) { 2091 if (FieldBaseElementType->isReferenceType()) { 2092 SemaRef.Diag(Constructor->getLocation(), 2093 diag::err_uninitialized_member_in_ctor) 2094 << (int)Constructor->isImplicit() 2095 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2096 << 0 << Field->getDeclName(); 2097 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2098 return true; 2099 } 2100 2101 if (FieldBaseElementType.isConstQualified()) { 2102 SemaRef.Diag(Constructor->getLocation(), 2103 diag::err_uninitialized_member_in_ctor) 2104 << (int)Constructor->isImplicit() 2105 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2106 << 1 << Field->getDeclName(); 2107 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2108 return true; 2109 } 2110 } 2111 2112 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2113 FieldBaseElementType->isObjCRetainableType() && 2114 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2115 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2116 // Instant objects: 2117 // Default-initialize Objective-C pointers to NULL. 2118 CXXMemberInit 2119 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2120 Loc, Loc, 2121 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2122 Loc); 2123 return false; 2124 } 2125 2126 // Nothing to initialize. 2127 CXXMemberInit = 0; 2128 return false; 2129} 2130 2131namespace { 2132struct BaseAndFieldInfo { 2133 Sema &S; 2134 CXXConstructorDecl *Ctor; 2135 bool AnyErrorsInInits; 2136 ImplicitInitializerKind IIK; 2137 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2138 llvm::SmallVector<CXXCtorInitializer*, 8> AllToInit; 2139 2140 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2141 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2142 // FIXME: Handle implicit move constructors. 2143 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2144 IIK = IIK_Copy; 2145 else 2146 IIK = IIK_Default; 2147 } 2148}; 2149} 2150 2151static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2152 FieldDecl *Top, FieldDecl *Field) { 2153 2154 // Overwhelmingly common case: we have a direct initializer for this field. 2155 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2156 Info.AllToInit.push_back(Init); 2157 return false; 2158 } 2159 2160 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2161 // has a brace-or-equal-initializer, the entity is initialized as specified 2162 // in [dcl.init]. 2163 if (Field->hasInClassInitializer()) { 2164 Info.AllToInit.push_back( 2165 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2166 SourceLocation(), 2167 SourceLocation(), 0, 2168 SourceLocation())); 2169 return false; 2170 } 2171 2172 if (Info.IIK == IIK_Default && Field->isAnonymousStructOrUnion()) { 2173 const RecordType *FieldClassType = Field->getType()->getAs<RecordType>(); 2174 assert(FieldClassType && "anonymous struct/union without record type"); 2175 CXXRecordDecl *FieldClassDecl 2176 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2177 2178 // Even though union members never have non-trivial default 2179 // constructions in C++03, we still build member initializers for aggregate 2180 // record types which can be union members, and C++0x allows non-trivial 2181 // default constructors for union members, so we ensure that only one 2182 // member is initialized for these. 2183 if (FieldClassDecl->isUnion()) { 2184 // First check for an explicit initializer for one field. 2185 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2186 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2187 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(*FA)) { 2188 Info.AllToInit.push_back(Init); 2189 2190 // Once we've initialized a field of an anonymous union, the union 2191 // field in the class is also initialized, so exit immediately. 2192 return false; 2193 } else if ((*FA)->isAnonymousStructOrUnion()) { 2194 if (CollectFieldInitializer(SemaRef, Info, Top, *FA)) 2195 return true; 2196 } 2197 } 2198 2199 // Fallthrough and construct a default initializer for the union as 2200 // a whole, which can call its default constructor if such a thing exists 2201 // (C++0x perhaps). FIXME: It's not clear that this is the correct 2202 // behavior going forward with C++0x, when anonymous unions there are 2203 // finalized, we should revisit this. 2204 } else { 2205 // For structs, we simply descend through to initialize all members where 2206 // necessary. 2207 for (RecordDecl::field_iterator FA = FieldClassDecl->field_begin(), 2208 EA = FieldClassDecl->field_end(); FA != EA; FA++) { 2209 if (CollectFieldInitializer(SemaRef, Info, Top, *FA)) 2210 return true; 2211 } 2212 } 2213 } 2214 2215 // Don't try to build an implicit initializer if there were semantic 2216 // errors in any of the initializers (and therefore we might be 2217 // missing some that the user actually wrote). 2218 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2219 return false; 2220 2221 CXXCtorInitializer *Init = 0; 2222 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, Init)) 2223 return true; 2224 2225 if (Init) 2226 Info.AllToInit.push_back(Init); 2227 2228 return false; 2229} 2230 2231bool 2232Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2233 CXXCtorInitializer *Initializer) { 2234 assert(Initializer->isDelegatingInitializer()); 2235 Constructor->setNumCtorInitializers(1); 2236 CXXCtorInitializer **initializer = 2237 new (Context) CXXCtorInitializer*[1]; 2238 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2239 Constructor->setCtorInitializers(initializer); 2240 2241 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2242 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2243 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2244 } 2245 2246 DelegatingCtorDecls.push_back(Constructor); 2247 2248 return false; 2249} 2250 2251bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2252 CXXCtorInitializer **Initializers, 2253 unsigned NumInitializers, 2254 bool AnyErrors) { 2255 if (Constructor->getDeclContext()->isDependentContext()) { 2256 // Just store the initializers as written, they will be checked during 2257 // instantiation. 2258 if (NumInitializers > 0) { 2259 Constructor->setNumCtorInitializers(NumInitializers); 2260 CXXCtorInitializer **baseOrMemberInitializers = 2261 new (Context) CXXCtorInitializer*[NumInitializers]; 2262 memcpy(baseOrMemberInitializers, Initializers, 2263 NumInitializers * sizeof(CXXCtorInitializer*)); 2264 Constructor->setCtorInitializers(baseOrMemberInitializers); 2265 } 2266 2267 return false; 2268 } 2269 2270 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2271 2272 // We need to build the initializer AST according to order of construction 2273 // and not what user specified in the Initializers list. 2274 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2275 if (!ClassDecl) 2276 return true; 2277 2278 bool HadError = false; 2279 2280 for (unsigned i = 0; i < NumInitializers; i++) { 2281 CXXCtorInitializer *Member = Initializers[i]; 2282 2283 if (Member->isBaseInitializer()) 2284 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2285 else 2286 Info.AllBaseFields[Member->getAnyMember()] = Member; 2287 } 2288 2289 // Keep track of the direct virtual bases. 2290 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2291 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2292 E = ClassDecl->bases_end(); I != E; ++I) { 2293 if (I->isVirtual()) 2294 DirectVBases.insert(I); 2295 } 2296 2297 // Push virtual bases before others. 2298 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2299 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2300 2301 if (CXXCtorInitializer *Value 2302 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2303 Info.AllToInit.push_back(Value); 2304 } else if (!AnyErrors) { 2305 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2306 CXXCtorInitializer *CXXBaseInit; 2307 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2308 VBase, IsInheritedVirtualBase, 2309 CXXBaseInit)) { 2310 HadError = true; 2311 continue; 2312 } 2313 2314 Info.AllToInit.push_back(CXXBaseInit); 2315 } 2316 } 2317 2318 // Non-virtual bases. 2319 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2320 E = ClassDecl->bases_end(); Base != E; ++Base) { 2321 // Virtuals are in the virtual base list and already constructed. 2322 if (Base->isVirtual()) 2323 continue; 2324 2325 if (CXXCtorInitializer *Value 2326 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2327 Info.AllToInit.push_back(Value); 2328 } else if (!AnyErrors) { 2329 CXXCtorInitializer *CXXBaseInit; 2330 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2331 Base, /*IsInheritedVirtualBase=*/false, 2332 CXXBaseInit)) { 2333 HadError = true; 2334 continue; 2335 } 2336 2337 Info.AllToInit.push_back(CXXBaseInit); 2338 } 2339 } 2340 2341 // Fields. 2342 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2343 E = ClassDecl->field_end(); Field != E; ++Field) { 2344 if ((*Field)->getType()->isIncompleteArrayType()) { 2345 assert(ClassDecl->hasFlexibleArrayMember() && 2346 "Incomplete array type is not valid"); 2347 continue; 2348 } 2349 if (CollectFieldInitializer(*this, Info, *Field, *Field)) 2350 HadError = true; 2351 } 2352 2353 NumInitializers = Info.AllToInit.size(); 2354 if (NumInitializers > 0) { 2355 Constructor->setNumCtorInitializers(NumInitializers); 2356 CXXCtorInitializer **baseOrMemberInitializers = 2357 new (Context) CXXCtorInitializer*[NumInitializers]; 2358 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2359 NumInitializers * sizeof(CXXCtorInitializer*)); 2360 Constructor->setCtorInitializers(baseOrMemberInitializers); 2361 2362 // Constructors implicitly reference the base and member 2363 // destructors. 2364 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2365 Constructor->getParent()); 2366 } 2367 2368 return HadError; 2369} 2370 2371static void *GetKeyForTopLevelField(FieldDecl *Field) { 2372 // For anonymous unions, use the class declaration as the key. 2373 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2374 if (RT->getDecl()->isAnonymousStructOrUnion()) 2375 return static_cast<void *>(RT->getDecl()); 2376 } 2377 return static_cast<void *>(Field); 2378} 2379 2380static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2381 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2382} 2383 2384static void *GetKeyForMember(ASTContext &Context, 2385 CXXCtorInitializer *Member) { 2386 if (!Member->isAnyMemberInitializer()) 2387 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2388 2389 // For fields injected into the class via declaration of an anonymous union, 2390 // use its anonymous union class declaration as the unique key. 2391 FieldDecl *Field = Member->getAnyMember(); 2392 2393 // If the field is a member of an anonymous struct or union, our key 2394 // is the anonymous record decl that's a direct child of the class. 2395 RecordDecl *RD = Field->getParent(); 2396 if (RD->isAnonymousStructOrUnion()) { 2397 while (true) { 2398 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2399 if (Parent->isAnonymousStructOrUnion()) 2400 RD = Parent; 2401 else 2402 break; 2403 } 2404 2405 return static_cast<void *>(RD); 2406 } 2407 2408 return static_cast<void *>(Field); 2409} 2410 2411static void 2412DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2413 const CXXConstructorDecl *Constructor, 2414 CXXCtorInitializer **Inits, 2415 unsigned NumInits) { 2416 if (Constructor->getDeclContext()->isDependentContext()) 2417 return; 2418 2419 // Don't check initializers order unless the warning is enabled at the 2420 // location of at least one initializer. 2421 bool ShouldCheckOrder = false; 2422 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2423 CXXCtorInitializer *Init = Inits[InitIndex]; 2424 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2425 Init->getSourceLocation()) 2426 != Diagnostic::Ignored) { 2427 ShouldCheckOrder = true; 2428 break; 2429 } 2430 } 2431 if (!ShouldCheckOrder) 2432 return; 2433 2434 // Build the list of bases and members in the order that they'll 2435 // actually be initialized. The explicit initializers should be in 2436 // this same order but may be missing things. 2437 llvm::SmallVector<const void*, 32> IdealInitKeys; 2438 2439 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2440 2441 // 1. Virtual bases. 2442 for (CXXRecordDecl::base_class_const_iterator VBase = 2443 ClassDecl->vbases_begin(), 2444 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2445 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2446 2447 // 2. Non-virtual bases. 2448 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2449 E = ClassDecl->bases_end(); Base != E; ++Base) { 2450 if (Base->isVirtual()) 2451 continue; 2452 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2453 } 2454 2455 // 3. Direct fields. 2456 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2457 E = ClassDecl->field_end(); Field != E; ++Field) 2458 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2459 2460 unsigned NumIdealInits = IdealInitKeys.size(); 2461 unsigned IdealIndex = 0; 2462 2463 CXXCtorInitializer *PrevInit = 0; 2464 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2465 CXXCtorInitializer *Init = Inits[InitIndex]; 2466 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2467 2468 // Scan forward to try to find this initializer in the idealized 2469 // initializers list. 2470 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2471 if (InitKey == IdealInitKeys[IdealIndex]) 2472 break; 2473 2474 // If we didn't find this initializer, it must be because we 2475 // scanned past it on a previous iteration. That can only 2476 // happen if we're out of order; emit a warning. 2477 if (IdealIndex == NumIdealInits && PrevInit) { 2478 Sema::SemaDiagnosticBuilder D = 2479 SemaRef.Diag(PrevInit->getSourceLocation(), 2480 diag::warn_initializer_out_of_order); 2481 2482 if (PrevInit->isAnyMemberInitializer()) 2483 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2484 else 2485 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2486 2487 if (Init->isAnyMemberInitializer()) 2488 D << 0 << Init->getAnyMember()->getDeclName(); 2489 else 2490 D << 1 << Init->getBaseClassInfo()->getType(); 2491 2492 // Move back to the initializer's location in the ideal list. 2493 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2494 if (InitKey == IdealInitKeys[IdealIndex]) 2495 break; 2496 2497 assert(IdealIndex != NumIdealInits && 2498 "initializer not found in initializer list"); 2499 } 2500 2501 PrevInit = Init; 2502 } 2503} 2504 2505namespace { 2506bool CheckRedundantInit(Sema &S, 2507 CXXCtorInitializer *Init, 2508 CXXCtorInitializer *&PrevInit) { 2509 if (!PrevInit) { 2510 PrevInit = Init; 2511 return false; 2512 } 2513 2514 if (FieldDecl *Field = Init->getMember()) 2515 S.Diag(Init->getSourceLocation(), 2516 diag::err_multiple_mem_initialization) 2517 << Field->getDeclName() 2518 << Init->getSourceRange(); 2519 else { 2520 const Type *BaseClass = Init->getBaseClass(); 2521 assert(BaseClass && "neither field nor base"); 2522 S.Diag(Init->getSourceLocation(), 2523 diag::err_multiple_base_initialization) 2524 << QualType(BaseClass, 0) 2525 << Init->getSourceRange(); 2526 } 2527 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2528 << 0 << PrevInit->getSourceRange(); 2529 2530 return true; 2531} 2532 2533typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2534typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2535 2536bool CheckRedundantUnionInit(Sema &S, 2537 CXXCtorInitializer *Init, 2538 RedundantUnionMap &Unions) { 2539 FieldDecl *Field = Init->getAnyMember(); 2540 RecordDecl *Parent = Field->getParent(); 2541 if (!Parent->isAnonymousStructOrUnion()) 2542 return false; 2543 2544 NamedDecl *Child = Field; 2545 do { 2546 if (Parent->isUnion()) { 2547 UnionEntry &En = Unions[Parent]; 2548 if (En.first && En.first != Child) { 2549 S.Diag(Init->getSourceLocation(), 2550 diag::err_multiple_mem_union_initialization) 2551 << Field->getDeclName() 2552 << Init->getSourceRange(); 2553 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2554 << 0 << En.second->getSourceRange(); 2555 return true; 2556 } else if (!En.first) { 2557 En.first = Child; 2558 En.second = Init; 2559 } 2560 } 2561 2562 Child = Parent; 2563 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2564 } while (Parent->isAnonymousStructOrUnion()); 2565 2566 return false; 2567} 2568} 2569 2570/// ActOnMemInitializers - Handle the member initializers for a constructor. 2571void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2572 SourceLocation ColonLoc, 2573 MemInitTy **meminits, unsigned NumMemInits, 2574 bool AnyErrors) { 2575 if (!ConstructorDecl) 2576 return; 2577 2578 AdjustDeclIfTemplate(ConstructorDecl); 2579 2580 CXXConstructorDecl *Constructor 2581 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2582 2583 if (!Constructor) { 2584 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2585 return; 2586 } 2587 2588 CXXCtorInitializer **MemInits = 2589 reinterpret_cast<CXXCtorInitializer **>(meminits); 2590 2591 // Mapping for the duplicate initializers check. 2592 // For member initializers, this is keyed with a FieldDecl*. 2593 // For base initializers, this is keyed with a Type*. 2594 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2595 2596 // Mapping for the inconsistent anonymous-union initializers check. 2597 RedundantUnionMap MemberUnions; 2598 2599 bool HadError = false; 2600 for (unsigned i = 0; i < NumMemInits; i++) { 2601 CXXCtorInitializer *Init = MemInits[i]; 2602 2603 // Set the source order index. 2604 Init->setSourceOrder(i); 2605 2606 if (Init->isAnyMemberInitializer()) { 2607 FieldDecl *Field = Init->getAnyMember(); 2608 if (CheckRedundantInit(*this, Init, Members[Field]) || 2609 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2610 HadError = true; 2611 } else if (Init->isBaseInitializer()) { 2612 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2613 if (CheckRedundantInit(*this, Init, Members[Key])) 2614 HadError = true; 2615 } else { 2616 assert(Init->isDelegatingInitializer()); 2617 // This must be the only initializer 2618 if (i != 0 || NumMemInits > 1) { 2619 Diag(MemInits[0]->getSourceLocation(), 2620 diag::err_delegating_initializer_alone) 2621 << MemInits[0]->getSourceRange(); 2622 HadError = true; 2623 // We will treat this as being the only initializer. 2624 } 2625 SetDelegatingInitializer(Constructor, MemInits[i]); 2626 // Return immediately as the initializer is set. 2627 return; 2628 } 2629 } 2630 2631 if (HadError) 2632 return; 2633 2634 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2635 2636 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2637} 2638 2639void 2640Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2641 CXXRecordDecl *ClassDecl) { 2642 // Ignore dependent contexts. 2643 if (ClassDecl->isDependentContext()) 2644 return; 2645 2646 // FIXME: all the access-control diagnostics are positioned on the 2647 // field/base declaration. That's probably good; that said, the 2648 // user might reasonably want to know why the destructor is being 2649 // emitted, and we currently don't say. 2650 2651 // Non-static data members. 2652 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2653 E = ClassDecl->field_end(); I != E; ++I) { 2654 FieldDecl *Field = *I; 2655 if (Field->isInvalidDecl()) 2656 continue; 2657 QualType FieldType = Context.getBaseElementType(Field->getType()); 2658 2659 const RecordType* RT = FieldType->getAs<RecordType>(); 2660 if (!RT) 2661 continue; 2662 2663 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2664 if (FieldClassDecl->isInvalidDecl()) 2665 continue; 2666 if (FieldClassDecl->hasTrivialDestructor()) 2667 continue; 2668 2669 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2670 assert(Dtor && "No dtor found for FieldClassDecl!"); 2671 CheckDestructorAccess(Field->getLocation(), Dtor, 2672 PDiag(diag::err_access_dtor_field) 2673 << Field->getDeclName() 2674 << FieldType); 2675 2676 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2677 } 2678 2679 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2680 2681 // Bases. 2682 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2683 E = ClassDecl->bases_end(); Base != E; ++Base) { 2684 // Bases are always records in a well-formed non-dependent class. 2685 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2686 2687 // Remember direct virtual bases. 2688 if (Base->isVirtual()) 2689 DirectVirtualBases.insert(RT); 2690 2691 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2692 // If our base class is invalid, we probably can't get its dtor anyway. 2693 if (BaseClassDecl->isInvalidDecl()) 2694 continue; 2695 // Ignore trivial destructors. 2696 if (BaseClassDecl->hasTrivialDestructor()) 2697 continue; 2698 2699 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2700 assert(Dtor && "No dtor found for BaseClassDecl!"); 2701 2702 // FIXME: caret should be on the start of the class name 2703 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2704 PDiag(diag::err_access_dtor_base) 2705 << Base->getType() 2706 << Base->getSourceRange()); 2707 2708 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2709 } 2710 2711 // Virtual bases. 2712 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2713 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2714 2715 // Bases are always records in a well-formed non-dependent class. 2716 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2717 2718 // Ignore direct virtual bases. 2719 if (DirectVirtualBases.count(RT)) 2720 continue; 2721 2722 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2723 // If our base class is invalid, we probably can't get its dtor anyway. 2724 if (BaseClassDecl->isInvalidDecl()) 2725 continue; 2726 // Ignore trivial destructors. 2727 if (BaseClassDecl->hasTrivialDestructor()) 2728 continue; 2729 2730 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2731 assert(Dtor && "No dtor found for BaseClassDecl!"); 2732 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2733 PDiag(diag::err_access_dtor_vbase) 2734 << VBase->getType()); 2735 2736 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2737 } 2738} 2739 2740void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2741 if (!CDtorDecl) 2742 return; 2743 2744 if (CXXConstructorDecl *Constructor 2745 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2746 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2747} 2748 2749bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2750 unsigned DiagID, AbstractDiagSelID SelID) { 2751 if (SelID == -1) 2752 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2753 else 2754 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2755} 2756 2757bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2758 const PartialDiagnostic &PD) { 2759 if (!getLangOptions().CPlusPlus) 2760 return false; 2761 2762 if (const ArrayType *AT = Context.getAsArrayType(T)) 2763 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2764 2765 if (const PointerType *PT = T->getAs<PointerType>()) { 2766 // Find the innermost pointer type. 2767 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2768 PT = T; 2769 2770 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2771 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2772 } 2773 2774 const RecordType *RT = T->getAs<RecordType>(); 2775 if (!RT) 2776 return false; 2777 2778 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2779 2780 // We can't answer whether something is abstract until it has a 2781 // definition. If it's currently being defined, we'll walk back 2782 // over all the declarations when we have a full definition. 2783 const CXXRecordDecl *Def = RD->getDefinition(); 2784 if (!Def || Def->isBeingDefined()) 2785 return false; 2786 2787 if (!RD->isAbstract()) 2788 return false; 2789 2790 Diag(Loc, PD) << RD->getDeclName(); 2791 DiagnoseAbstractType(RD); 2792 2793 return true; 2794} 2795 2796void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2797 // Check if we've already emitted the list of pure virtual functions 2798 // for this class. 2799 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2800 return; 2801 2802 CXXFinalOverriderMap FinalOverriders; 2803 RD->getFinalOverriders(FinalOverriders); 2804 2805 // Keep a set of seen pure methods so we won't diagnose the same method 2806 // more than once. 2807 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2808 2809 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2810 MEnd = FinalOverriders.end(); 2811 M != MEnd; 2812 ++M) { 2813 for (OverridingMethods::iterator SO = M->second.begin(), 2814 SOEnd = M->second.end(); 2815 SO != SOEnd; ++SO) { 2816 // C++ [class.abstract]p4: 2817 // A class is abstract if it contains or inherits at least one 2818 // pure virtual function for which the final overrider is pure 2819 // virtual. 2820 2821 // 2822 if (SO->second.size() != 1) 2823 continue; 2824 2825 if (!SO->second.front().Method->isPure()) 2826 continue; 2827 2828 if (!SeenPureMethods.insert(SO->second.front().Method)) 2829 continue; 2830 2831 Diag(SO->second.front().Method->getLocation(), 2832 diag::note_pure_virtual_function) 2833 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2834 } 2835 } 2836 2837 if (!PureVirtualClassDiagSet) 2838 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2839 PureVirtualClassDiagSet->insert(RD); 2840} 2841 2842namespace { 2843struct AbstractUsageInfo { 2844 Sema &S; 2845 CXXRecordDecl *Record; 2846 CanQualType AbstractType; 2847 bool Invalid; 2848 2849 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2850 : S(S), Record(Record), 2851 AbstractType(S.Context.getCanonicalType( 2852 S.Context.getTypeDeclType(Record))), 2853 Invalid(false) {} 2854 2855 void DiagnoseAbstractType() { 2856 if (Invalid) return; 2857 S.DiagnoseAbstractType(Record); 2858 Invalid = true; 2859 } 2860 2861 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2862}; 2863 2864struct CheckAbstractUsage { 2865 AbstractUsageInfo &Info; 2866 const NamedDecl *Ctx; 2867 2868 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2869 : Info(Info), Ctx(Ctx) {} 2870 2871 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2872 switch (TL.getTypeLocClass()) { 2873#define ABSTRACT_TYPELOC(CLASS, PARENT) 2874#define TYPELOC(CLASS, PARENT) \ 2875 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2876#include "clang/AST/TypeLocNodes.def" 2877 } 2878 } 2879 2880 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2881 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2882 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2883 if (!TL.getArg(I)) 2884 continue; 2885 2886 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2887 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2888 } 2889 } 2890 2891 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2892 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2893 } 2894 2895 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2896 // Visit the type parameters from a permissive context. 2897 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2898 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2899 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2900 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2901 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2902 // TODO: other template argument types? 2903 } 2904 } 2905 2906 // Visit pointee types from a permissive context. 2907#define CheckPolymorphic(Type) \ 2908 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2909 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2910 } 2911 CheckPolymorphic(PointerTypeLoc) 2912 CheckPolymorphic(ReferenceTypeLoc) 2913 CheckPolymorphic(MemberPointerTypeLoc) 2914 CheckPolymorphic(BlockPointerTypeLoc) 2915 2916 /// Handle all the types we haven't given a more specific 2917 /// implementation for above. 2918 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2919 // Every other kind of type that we haven't called out already 2920 // that has an inner type is either (1) sugar or (2) contains that 2921 // inner type in some way as a subobject. 2922 if (TypeLoc Next = TL.getNextTypeLoc()) 2923 return Visit(Next, Sel); 2924 2925 // If there's no inner type and we're in a permissive context, 2926 // don't diagnose. 2927 if (Sel == Sema::AbstractNone) return; 2928 2929 // Check whether the type matches the abstract type. 2930 QualType T = TL.getType(); 2931 if (T->isArrayType()) { 2932 Sel = Sema::AbstractArrayType; 2933 T = Info.S.Context.getBaseElementType(T); 2934 } 2935 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2936 if (CT != Info.AbstractType) return; 2937 2938 // It matched; do some magic. 2939 if (Sel == Sema::AbstractArrayType) { 2940 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2941 << T << TL.getSourceRange(); 2942 } else { 2943 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2944 << Sel << T << TL.getSourceRange(); 2945 } 2946 Info.DiagnoseAbstractType(); 2947 } 2948}; 2949 2950void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2951 Sema::AbstractDiagSelID Sel) { 2952 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2953} 2954 2955} 2956 2957/// Check for invalid uses of an abstract type in a method declaration. 2958static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2959 CXXMethodDecl *MD) { 2960 // No need to do the check on definitions, which require that 2961 // the return/param types be complete. 2962 if (MD->doesThisDeclarationHaveABody()) 2963 return; 2964 2965 // For safety's sake, just ignore it if we don't have type source 2966 // information. This should never happen for non-implicit methods, 2967 // but... 2968 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 2969 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 2970} 2971 2972/// Check for invalid uses of an abstract type within a class definition. 2973static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2974 CXXRecordDecl *RD) { 2975 for (CXXRecordDecl::decl_iterator 2976 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 2977 Decl *D = *I; 2978 if (D->isImplicit()) continue; 2979 2980 // Methods and method templates. 2981 if (isa<CXXMethodDecl>(D)) { 2982 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 2983 } else if (isa<FunctionTemplateDecl>(D)) { 2984 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 2985 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 2986 2987 // Fields and static variables. 2988 } else if (isa<FieldDecl>(D)) { 2989 FieldDecl *FD = cast<FieldDecl>(D); 2990 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 2991 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 2992 } else if (isa<VarDecl>(D)) { 2993 VarDecl *VD = cast<VarDecl>(D); 2994 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 2995 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 2996 2997 // Nested classes and class templates. 2998 } else if (isa<CXXRecordDecl>(D)) { 2999 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3000 } else if (isa<ClassTemplateDecl>(D)) { 3001 CheckAbstractClassUsage(Info, 3002 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3003 } 3004 } 3005} 3006 3007/// \brief Perform semantic checks on a class definition that has been 3008/// completing, introducing implicitly-declared members, checking for 3009/// abstract types, etc. 3010void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3011 if (!Record) 3012 return; 3013 3014 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3015 AbstractUsageInfo Info(*this, Record); 3016 CheckAbstractClassUsage(Info, Record); 3017 } 3018 3019 // If this is not an aggregate type and has no user-declared constructor, 3020 // complain about any non-static data members of reference or const scalar 3021 // type, since they will never get initializers. 3022 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3023 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3024 bool Complained = false; 3025 for (RecordDecl::field_iterator F = Record->field_begin(), 3026 FEnd = Record->field_end(); 3027 F != FEnd; ++F) { 3028 if (F->hasInClassInitializer()) 3029 continue; 3030 3031 if (F->getType()->isReferenceType() || 3032 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3033 if (!Complained) { 3034 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3035 << Record->getTagKind() << Record; 3036 Complained = true; 3037 } 3038 3039 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3040 << F->getType()->isReferenceType() 3041 << F->getDeclName(); 3042 } 3043 } 3044 } 3045 3046 if (Record->isDynamicClass() && !Record->isDependentType()) 3047 DynamicClasses.push_back(Record); 3048 3049 if (Record->getIdentifier()) { 3050 // C++ [class.mem]p13: 3051 // If T is the name of a class, then each of the following shall have a 3052 // name different from T: 3053 // - every member of every anonymous union that is a member of class T. 3054 // 3055 // C++ [class.mem]p14: 3056 // In addition, if class T has a user-declared constructor (12.1), every 3057 // non-static data member of class T shall have a name different from T. 3058 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3059 R.first != R.second; ++R.first) { 3060 NamedDecl *D = *R.first; 3061 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3062 isa<IndirectFieldDecl>(D)) { 3063 Diag(D->getLocation(), diag::err_member_name_of_class) 3064 << D->getDeclName(); 3065 break; 3066 } 3067 } 3068 } 3069 3070 // Warn if the class has virtual methods but non-virtual public destructor. 3071 if (Record->isPolymorphic() && !Record->isDependentType()) { 3072 CXXDestructorDecl *dtor = Record->getDestructor(); 3073 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3074 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3075 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3076 } 3077 3078 // See if a method overloads virtual methods in a base 3079 /// class without overriding any. 3080 if (!Record->isDependentType()) { 3081 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3082 MEnd = Record->method_end(); 3083 M != MEnd; ++M) { 3084 if (!(*M)->isStatic()) 3085 DiagnoseHiddenVirtualMethods(Record, *M); 3086 } 3087 } 3088 3089 // Declare inherited constructors. We do this eagerly here because: 3090 // - The standard requires an eager diagnostic for conflicting inherited 3091 // constructors from different classes. 3092 // - The lazy declaration of the other implicit constructors is so as to not 3093 // waste space and performance on classes that are not meant to be 3094 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3095 // have inherited constructors. 3096 DeclareInheritedConstructors(Record); 3097 3098 if (!Record->isDependentType()) 3099 CheckExplicitlyDefaultedMethods(Record); 3100} 3101 3102void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3103 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3104 ME = Record->method_end(); 3105 MI != ME; ++MI) { 3106 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3107 switch (getSpecialMember(*MI)) { 3108 case CXXDefaultConstructor: 3109 CheckExplicitlyDefaultedDefaultConstructor( 3110 cast<CXXConstructorDecl>(*MI)); 3111 break; 3112 3113 case CXXDestructor: 3114 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3115 break; 3116 3117 case CXXCopyConstructor: 3118 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3119 break; 3120 3121 case CXXCopyAssignment: 3122 CheckExplicitlyDefaultedCopyAssignment(*MI); 3123 break; 3124 3125 case CXXMoveConstructor: 3126 case CXXMoveAssignment: 3127 Diag(MI->getLocation(), diag::err_defaulted_move_unsupported); 3128 break; 3129 3130 default: 3131 // FIXME: Do moves once they exist 3132 llvm_unreachable("non-special member explicitly defaulted!"); 3133 } 3134 } 3135 } 3136 3137} 3138 3139void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3140 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3141 3142 // Whether this was the first-declared instance of the constructor. 3143 // This affects whether we implicitly add an exception spec (and, eventually, 3144 // constexpr). It is also ill-formed to explicitly default a constructor such 3145 // that it would be deleted. (C++0x [decl.fct.def.default]) 3146 bool First = CD == CD->getCanonicalDecl(); 3147 3148 bool HadError = false; 3149 if (CD->getNumParams() != 0) { 3150 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3151 << CD->getSourceRange(); 3152 HadError = true; 3153 } 3154 3155 ImplicitExceptionSpecification Spec 3156 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3157 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3158 if (EPI.ExceptionSpecType == EST_Delayed) { 3159 // Exception specification depends on some deferred part of the class. We'll 3160 // try again when the class's definition has been fully processed. 3161 return; 3162 } 3163 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3164 *ExceptionType = Context.getFunctionType( 3165 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3166 3167 if (CtorType->hasExceptionSpec()) { 3168 if (CheckEquivalentExceptionSpec( 3169 PDiag(diag::err_incorrect_defaulted_exception_spec) 3170 << CXXDefaultConstructor, 3171 PDiag(), 3172 ExceptionType, SourceLocation(), 3173 CtorType, CD->getLocation())) { 3174 HadError = true; 3175 } 3176 } else if (First) { 3177 // We set the declaration to have the computed exception spec here. 3178 // We know there are no parameters. 3179 EPI.ExtInfo = CtorType->getExtInfo(); 3180 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3181 } 3182 3183 if (HadError) { 3184 CD->setInvalidDecl(); 3185 return; 3186 } 3187 3188 if (ShouldDeleteDefaultConstructor(CD)) { 3189 if (First) { 3190 CD->setDeletedAsWritten(); 3191 } else { 3192 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3193 << CXXDefaultConstructor; 3194 CD->setInvalidDecl(); 3195 } 3196 } 3197} 3198 3199void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3200 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3201 3202 // Whether this was the first-declared instance of the constructor. 3203 bool First = CD == CD->getCanonicalDecl(); 3204 3205 bool HadError = false; 3206 if (CD->getNumParams() != 1) { 3207 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3208 << CD->getSourceRange(); 3209 HadError = true; 3210 } 3211 3212 ImplicitExceptionSpecification Spec(Context); 3213 bool Const; 3214 llvm::tie(Spec, Const) = 3215 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3216 3217 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3218 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3219 *ExceptionType = Context.getFunctionType( 3220 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3221 3222 // Check for parameter type matching. 3223 // This is a copy ctor so we know it's a cv-qualified reference to T. 3224 QualType ArgType = CtorType->getArgType(0); 3225 if (ArgType->getPointeeType().isVolatileQualified()) { 3226 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3227 HadError = true; 3228 } 3229 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3230 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3231 HadError = true; 3232 } 3233 3234 if (CtorType->hasExceptionSpec()) { 3235 if (CheckEquivalentExceptionSpec( 3236 PDiag(diag::err_incorrect_defaulted_exception_spec) 3237 << CXXCopyConstructor, 3238 PDiag(), 3239 ExceptionType, SourceLocation(), 3240 CtorType, CD->getLocation())) { 3241 HadError = true; 3242 } 3243 } else if (First) { 3244 // We set the declaration to have the computed exception spec here. 3245 // We duplicate the one parameter type. 3246 EPI.ExtInfo = CtorType->getExtInfo(); 3247 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3248 } 3249 3250 if (HadError) { 3251 CD->setInvalidDecl(); 3252 return; 3253 } 3254 3255 if (ShouldDeleteCopyConstructor(CD)) { 3256 if (First) { 3257 CD->setDeletedAsWritten(); 3258 } else { 3259 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3260 << CXXCopyConstructor; 3261 CD->setInvalidDecl(); 3262 } 3263 } 3264} 3265 3266void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3267 assert(MD->isExplicitlyDefaulted()); 3268 3269 // Whether this was the first-declared instance of the operator 3270 bool First = MD == MD->getCanonicalDecl(); 3271 3272 bool HadError = false; 3273 if (MD->getNumParams() != 1) { 3274 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3275 << MD->getSourceRange(); 3276 HadError = true; 3277 } 3278 3279 QualType ReturnType = 3280 MD->getType()->getAs<FunctionType>()->getResultType(); 3281 if (!ReturnType->isLValueReferenceType() || 3282 !Context.hasSameType( 3283 Context.getCanonicalType(ReturnType->getPointeeType()), 3284 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3285 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3286 HadError = true; 3287 } 3288 3289 ImplicitExceptionSpecification Spec(Context); 3290 bool Const; 3291 llvm::tie(Spec, Const) = 3292 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3293 3294 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3295 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3296 *ExceptionType = Context.getFunctionType( 3297 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3298 3299 QualType ArgType = OperType->getArgType(0); 3300 if (!ArgType->isReferenceType()) { 3301 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3302 HadError = true; 3303 } else { 3304 if (ArgType->getPointeeType().isVolatileQualified()) { 3305 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3306 HadError = true; 3307 } 3308 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3309 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3310 HadError = true; 3311 } 3312 } 3313 3314 if (OperType->getTypeQuals()) { 3315 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3316 HadError = true; 3317 } 3318 3319 if (OperType->hasExceptionSpec()) { 3320 if (CheckEquivalentExceptionSpec( 3321 PDiag(diag::err_incorrect_defaulted_exception_spec) 3322 << CXXCopyAssignment, 3323 PDiag(), 3324 ExceptionType, SourceLocation(), 3325 OperType, MD->getLocation())) { 3326 HadError = true; 3327 } 3328 } else if (First) { 3329 // We set the declaration to have the computed exception spec here. 3330 // We duplicate the one parameter type. 3331 EPI.RefQualifier = OperType->getRefQualifier(); 3332 EPI.ExtInfo = OperType->getExtInfo(); 3333 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3334 } 3335 3336 if (HadError) { 3337 MD->setInvalidDecl(); 3338 return; 3339 } 3340 3341 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3342 if (First) { 3343 MD->setDeletedAsWritten(); 3344 } else { 3345 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3346 << CXXCopyAssignment; 3347 MD->setInvalidDecl(); 3348 } 3349 } 3350} 3351 3352void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3353 assert(DD->isExplicitlyDefaulted()); 3354 3355 // Whether this was the first-declared instance of the destructor. 3356 bool First = DD == DD->getCanonicalDecl(); 3357 3358 ImplicitExceptionSpecification Spec 3359 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3360 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3361 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3362 *ExceptionType = Context.getFunctionType( 3363 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3364 3365 if (DtorType->hasExceptionSpec()) { 3366 if (CheckEquivalentExceptionSpec( 3367 PDiag(diag::err_incorrect_defaulted_exception_spec) 3368 << CXXDestructor, 3369 PDiag(), 3370 ExceptionType, SourceLocation(), 3371 DtorType, DD->getLocation())) { 3372 DD->setInvalidDecl(); 3373 return; 3374 } 3375 } else if (First) { 3376 // We set the declaration to have the computed exception spec here. 3377 // There are no parameters. 3378 EPI.ExtInfo = DtorType->getExtInfo(); 3379 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3380 } 3381 3382 if (ShouldDeleteDestructor(DD)) { 3383 if (First) { 3384 DD->setDeletedAsWritten(); 3385 } else { 3386 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3387 << CXXDestructor; 3388 DD->setInvalidDecl(); 3389 } 3390 } 3391} 3392 3393bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3394 CXXRecordDecl *RD = CD->getParent(); 3395 assert(!RD->isDependentType() && "do deletion after instantiation"); 3396 if (!LangOpts.CPlusPlus0x) 3397 return false; 3398 3399 SourceLocation Loc = CD->getLocation(); 3400 3401 // Do access control from the constructor 3402 ContextRAII CtorContext(*this, CD); 3403 3404 bool Union = RD->isUnion(); 3405 bool AllConst = true; 3406 3407 // We do this because we should never actually use an anonymous 3408 // union's constructor. 3409 if (Union && RD->isAnonymousStructOrUnion()) 3410 return false; 3411 3412 // FIXME: We should put some diagnostic logic right into this function. 3413 3414 // C++0x [class.ctor]/5 3415 // A defaulted default constructor for class X is defined as deleted if: 3416 3417 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3418 BE = RD->bases_end(); 3419 BI != BE; ++BI) { 3420 // We'll handle this one later 3421 if (BI->isVirtual()) 3422 continue; 3423 3424 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3425 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3426 3427 // -- any [direct base class] has a type with a destructor that is 3428 // deleted or inaccessible from the defaulted default constructor 3429 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3430 if (BaseDtor->isDeleted()) 3431 return true; 3432 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3433 AR_accessible) 3434 return true; 3435 3436 // -- any [direct base class either] has no default constructor or 3437 // overload resolution as applied to [its] default constructor 3438 // results in an ambiguity or in a function that is deleted or 3439 // inaccessible from the defaulted default constructor 3440 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3441 if (!BaseDefault || BaseDefault->isDeleted()) 3442 return true; 3443 3444 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3445 PDiag()) != AR_accessible) 3446 return true; 3447 } 3448 3449 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3450 BE = RD->vbases_end(); 3451 BI != BE; ++BI) { 3452 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3453 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3454 3455 // -- any [virtual base class] has a type with a destructor that is 3456 // delete or inaccessible from the defaulted default constructor 3457 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3458 if (BaseDtor->isDeleted()) 3459 return true; 3460 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3461 AR_accessible) 3462 return true; 3463 3464 // -- any [virtual base class either] has no default constructor or 3465 // overload resolution as applied to [its] default constructor 3466 // results in an ambiguity or in a function that is deleted or 3467 // inaccessible from the defaulted default constructor 3468 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3469 if (!BaseDefault || BaseDefault->isDeleted()) 3470 return true; 3471 3472 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3473 PDiag()) != AR_accessible) 3474 return true; 3475 } 3476 3477 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3478 FE = RD->field_end(); 3479 FI != FE; ++FI) { 3480 if (FI->isInvalidDecl()) 3481 continue; 3482 3483 QualType FieldType = Context.getBaseElementType(FI->getType()); 3484 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3485 3486 // -- any non-static data member with no brace-or-equal-initializer is of 3487 // reference type 3488 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3489 return true; 3490 3491 // -- X is a union and all its variant members are of const-qualified type 3492 // (or array thereof) 3493 if (Union && !FieldType.isConstQualified()) 3494 AllConst = false; 3495 3496 if (FieldRecord) { 3497 // -- X is a union-like class that has a variant member with a non-trivial 3498 // default constructor 3499 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3500 return true; 3501 3502 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3503 if (FieldDtor->isDeleted()) 3504 return true; 3505 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3506 AR_accessible) 3507 return true; 3508 3509 // -- any non-variant non-static data member of const-qualified type (or 3510 // array thereof) with no brace-or-equal-initializer does not have a 3511 // user-provided default constructor 3512 if (FieldType.isConstQualified() && 3513 !FI->hasInClassInitializer() && 3514 !FieldRecord->hasUserProvidedDefaultConstructor()) 3515 return true; 3516 3517 if (!Union && FieldRecord->isUnion() && 3518 FieldRecord->isAnonymousStructOrUnion()) { 3519 // We're okay to reuse AllConst here since we only care about the 3520 // value otherwise if we're in a union. 3521 AllConst = true; 3522 3523 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3524 UE = FieldRecord->field_end(); 3525 UI != UE; ++UI) { 3526 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3527 CXXRecordDecl *UnionFieldRecord = 3528 UnionFieldType->getAsCXXRecordDecl(); 3529 3530 if (!UnionFieldType.isConstQualified()) 3531 AllConst = false; 3532 3533 if (UnionFieldRecord && 3534 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3535 return true; 3536 } 3537 3538 if (AllConst) 3539 return true; 3540 3541 // Don't try to initialize the anonymous union 3542 // This is technically non-conformant, but sanity demands it. 3543 continue; 3544 } 3545 3546 // -- any non-static data member with no brace-or-equal-initializer has 3547 // class type M (or array thereof) and either M has no default 3548 // constructor or overload resolution as applied to M's default 3549 // constructor results in an ambiguity or in a function that is deleted 3550 // or inaccessible from the defaulted default constructor. 3551 if (!FI->hasInClassInitializer()) { 3552 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3553 if (!FieldDefault || FieldDefault->isDeleted()) 3554 return true; 3555 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3556 PDiag()) != AR_accessible) 3557 return true; 3558 } 3559 } else if (!Union && FieldType.isConstQualified() && 3560 !FI->hasInClassInitializer()) { 3561 // -- any non-variant non-static data member of const-qualified type (or 3562 // array thereof) with no brace-or-equal-initializer does not have a 3563 // user-provided default constructor 3564 return true; 3565 } 3566 } 3567 3568 if (Union && AllConst) 3569 return true; 3570 3571 return false; 3572} 3573 3574bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3575 CXXRecordDecl *RD = CD->getParent(); 3576 assert(!RD->isDependentType() && "do deletion after instantiation"); 3577 if (!LangOpts.CPlusPlus0x) 3578 return false; 3579 3580 SourceLocation Loc = CD->getLocation(); 3581 3582 // Do access control from the constructor 3583 ContextRAII CtorContext(*this, CD); 3584 3585 bool Union = RD->isUnion(); 3586 3587 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3588 "copy assignment arg has no pointee type"); 3589 unsigned ArgQuals = 3590 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3591 Qualifiers::Const : 0; 3592 3593 // We do this because we should never actually use an anonymous 3594 // union's constructor. 3595 if (Union && RD->isAnonymousStructOrUnion()) 3596 return false; 3597 3598 // FIXME: We should put some diagnostic logic right into this function. 3599 3600 // C++0x [class.copy]/11 3601 // A defaulted [copy] constructor for class X is defined as delete if X has: 3602 3603 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3604 BE = RD->bases_end(); 3605 BI != BE; ++BI) { 3606 // We'll handle this one later 3607 if (BI->isVirtual()) 3608 continue; 3609 3610 QualType BaseType = BI->getType(); 3611 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3612 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3613 3614 // -- any [direct base class] of a type with a destructor that is deleted or 3615 // inaccessible from the defaulted constructor 3616 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3617 if (BaseDtor->isDeleted()) 3618 return true; 3619 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3620 AR_accessible) 3621 return true; 3622 3623 // -- a [direct base class] B that cannot be [copied] because overload 3624 // resolution, as applied to B's [copy] constructor, results in an 3625 // ambiguity or a function that is deleted or inaccessible from the 3626 // defaulted constructor 3627 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3628 if (!BaseCtor || BaseCtor->isDeleted()) 3629 return true; 3630 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3631 AR_accessible) 3632 return true; 3633 } 3634 3635 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3636 BE = RD->vbases_end(); 3637 BI != BE; ++BI) { 3638 QualType BaseType = BI->getType(); 3639 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3640 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3641 3642 // -- any [virtual base class] of a type with a destructor that is deleted or 3643 // inaccessible from the defaulted constructor 3644 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3645 if (BaseDtor->isDeleted()) 3646 return true; 3647 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3648 AR_accessible) 3649 return true; 3650 3651 // -- a [virtual base class] B that cannot be [copied] because overload 3652 // resolution, as applied to B's [copy] constructor, results in an 3653 // ambiguity or a function that is deleted or inaccessible from the 3654 // defaulted constructor 3655 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3656 if (!BaseCtor || BaseCtor->isDeleted()) 3657 return true; 3658 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3659 AR_accessible) 3660 return true; 3661 } 3662 3663 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3664 FE = RD->field_end(); 3665 FI != FE; ++FI) { 3666 QualType FieldType = Context.getBaseElementType(FI->getType()); 3667 3668 // -- for a copy constructor, a non-static data member of rvalue reference 3669 // type 3670 if (FieldType->isRValueReferenceType()) 3671 return true; 3672 3673 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3674 3675 if (FieldRecord) { 3676 // This is an anonymous union 3677 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3678 // Anonymous unions inside unions do not variant members create 3679 if (!Union) { 3680 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3681 UE = FieldRecord->field_end(); 3682 UI != UE; ++UI) { 3683 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3684 CXXRecordDecl *UnionFieldRecord = 3685 UnionFieldType->getAsCXXRecordDecl(); 3686 3687 // -- a variant member with a non-trivial [copy] constructor and X 3688 // is a union-like class 3689 if (UnionFieldRecord && 3690 !UnionFieldRecord->hasTrivialCopyConstructor()) 3691 return true; 3692 } 3693 } 3694 3695 // Don't try to initalize an anonymous union 3696 continue; 3697 } else { 3698 // -- a variant member with a non-trivial [copy] constructor and X is a 3699 // union-like class 3700 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3701 return true; 3702 3703 // -- any [non-static data member] of a type with a destructor that is 3704 // deleted or inaccessible from the defaulted constructor 3705 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3706 if (FieldDtor->isDeleted()) 3707 return true; 3708 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3709 AR_accessible) 3710 return true; 3711 } 3712 3713 // -- a [non-static data member of class type (or array thereof)] B that 3714 // cannot be [copied] because overload resolution, as applied to B's 3715 // [copy] constructor, results in an ambiguity or a function that is 3716 // deleted or inaccessible from the defaulted constructor 3717 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 3718 ArgQuals); 3719 if (!FieldCtor || FieldCtor->isDeleted()) 3720 return true; 3721 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 3722 PDiag()) != AR_accessible) 3723 return true; 3724 } 3725 } 3726 3727 return false; 3728} 3729 3730bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3731 CXXRecordDecl *RD = MD->getParent(); 3732 assert(!RD->isDependentType() && "do deletion after instantiation"); 3733 if (!LangOpts.CPlusPlus0x) 3734 return false; 3735 3736 SourceLocation Loc = MD->getLocation(); 3737 3738 // Do access control from the constructor 3739 ContextRAII MethodContext(*this, MD); 3740 3741 bool Union = RD->isUnion(); 3742 3743 unsigned ArgQuals = 3744 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3745 Qualifiers::Const : 0; 3746 3747 // We do this because we should never actually use an anonymous 3748 // union's constructor. 3749 if (Union && RD->isAnonymousStructOrUnion()) 3750 return false; 3751 3752 // FIXME: We should put some diagnostic logic right into this function. 3753 3754 // C++0x [class.copy]/11 3755 // A defaulted [copy] assignment operator for class X is defined as deleted 3756 // if X has: 3757 3758 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3759 BE = RD->bases_end(); 3760 BI != BE; ++BI) { 3761 // We'll handle this one later 3762 if (BI->isVirtual()) 3763 continue; 3764 3765 QualType BaseType = BI->getType(); 3766 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3767 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3768 3769 // -- a [direct base class] B that cannot be [copied] because overload 3770 // resolution, as applied to B's [copy] assignment operator, results in 3771 // an ambiguity or a function that is deleted or inaccessible from the 3772 // assignment operator 3773 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 3774 0); 3775 if (!CopyOper || CopyOper->isDeleted()) 3776 return true; 3777 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3778 return true; 3779 } 3780 3781 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3782 BE = RD->vbases_end(); 3783 BI != BE; ++BI) { 3784 QualType BaseType = BI->getType(); 3785 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3786 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3787 3788 // -- a [virtual base class] B that cannot be [copied] because overload 3789 // resolution, as applied to B's [copy] assignment operator, results in 3790 // an ambiguity or a function that is deleted or inaccessible from the 3791 // assignment operator 3792 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 3793 0); 3794 if (!CopyOper || CopyOper->isDeleted()) 3795 return true; 3796 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3797 return true; 3798 } 3799 3800 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3801 FE = RD->field_end(); 3802 FI != FE; ++FI) { 3803 QualType FieldType = Context.getBaseElementType(FI->getType()); 3804 3805 // -- a non-static data member of reference type 3806 if (FieldType->isReferenceType()) 3807 return true; 3808 3809 // -- a non-static data member of const non-class type (or array thereof) 3810 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3811 return true; 3812 3813 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3814 3815 if (FieldRecord) { 3816 // This is an anonymous union 3817 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3818 // Anonymous unions inside unions do not variant members create 3819 if (!Union) { 3820 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3821 UE = FieldRecord->field_end(); 3822 UI != UE; ++UI) { 3823 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3824 CXXRecordDecl *UnionFieldRecord = 3825 UnionFieldType->getAsCXXRecordDecl(); 3826 3827 // -- a variant member with a non-trivial [copy] assignment operator 3828 // and X is a union-like class 3829 if (UnionFieldRecord && 3830 !UnionFieldRecord->hasTrivialCopyAssignment()) 3831 return true; 3832 } 3833 } 3834 3835 // Don't try to initalize an anonymous union 3836 continue; 3837 // -- a variant member with a non-trivial [copy] assignment operator 3838 // and X is a union-like class 3839 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3840 return true; 3841 } 3842 3843 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 3844 false, 0); 3845 if (!CopyOper || CopyOper->isDeleted()) 3846 return false; 3847 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3848 return false; 3849 } 3850 } 3851 3852 return false; 3853} 3854 3855bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3856 CXXRecordDecl *RD = DD->getParent(); 3857 assert(!RD->isDependentType() && "do deletion after instantiation"); 3858 if (!LangOpts.CPlusPlus0x) 3859 return false; 3860 3861 SourceLocation Loc = DD->getLocation(); 3862 3863 // Do access control from the destructor 3864 ContextRAII CtorContext(*this, DD); 3865 3866 bool Union = RD->isUnion(); 3867 3868 // We do this because we should never actually use an anonymous 3869 // union's destructor. 3870 if (Union && RD->isAnonymousStructOrUnion()) 3871 return false; 3872 3873 // C++0x [class.dtor]p5 3874 // A defaulted destructor for a class X is defined as deleted if: 3875 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3876 BE = RD->bases_end(); 3877 BI != BE; ++BI) { 3878 // We'll handle this one later 3879 if (BI->isVirtual()) 3880 continue; 3881 3882 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3883 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3884 assert(BaseDtor && "base has no destructor"); 3885 3886 // -- any direct or virtual base class has a deleted destructor or 3887 // a destructor that is inaccessible from the defaulted destructor 3888 if (BaseDtor->isDeleted()) 3889 return true; 3890 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3891 AR_accessible) 3892 return true; 3893 } 3894 3895 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3896 BE = RD->vbases_end(); 3897 BI != BE; ++BI) { 3898 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3899 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3900 assert(BaseDtor && "base has no destructor"); 3901 3902 // -- any direct or virtual base class has a deleted destructor or 3903 // a destructor that is inaccessible from the defaulted destructor 3904 if (BaseDtor->isDeleted()) 3905 return true; 3906 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3907 AR_accessible) 3908 return true; 3909 } 3910 3911 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3912 FE = RD->field_end(); 3913 FI != FE; ++FI) { 3914 QualType FieldType = Context.getBaseElementType(FI->getType()); 3915 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3916 if (FieldRecord) { 3917 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3918 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3919 UE = FieldRecord->field_end(); 3920 UI != UE; ++UI) { 3921 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3922 CXXRecordDecl *UnionFieldRecord = 3923 UnionFieldType->getAsCXXRecordDecl(); 3924 3925 // -- X is a union-like class that has a variant member with a non- 3926 // trivial destructor. 3927 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3928 return true; 3929 } 3930 // Technically we are supposed to do this next check unconditionally. 3931 // But that makes absolutely no sense. 3932 } else { 3933 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3934 3935 // -- any of the non-static data members has class type M (or array 3936 // thereof) and M has a deleted destructor or a destructor that is 3937 // inaccessible from the defaulted destructor 3938 if (FieldDtor->isDeleted()) 3939 return true; 3940 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3941 AR_accessible) 3942 return true; 3943 3944 // -- X is a union-like class that has a variant member with a non- 3945 // trivial destructor. 3946 if (Union && !FieldDtor->isTrivial()) 3947 return true; 3948 } 3949 } 3950 } 3951 3952 if (DD->isVirtual()) { 3953 FunctionDecl *OperatorDelete = 0; 3954 DeclarationName Name = 3955 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3956 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3957 false)) 3958 return true; 3959 } 3960 3961 3962 return false; 3963} 3964 3965/// \brief Data used with FindHiddenVirtualMethod 3966namespace { 3967 struct FindHiddenVirtualMethodData { 3968 Sema *S; 3969 CXXMethodDecl *Method; 3970 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 3971 llvm::SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 3972 }; 3973} 3974 3975/// \brief Member lookup function that determines whether a given C++ 3976/// method overloads virtual methods in a base class without overriding any, 3977/// to be used with CXXRecordDecl::lookupInBases(). 3978static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 3979 CXXBasePath &Path, 3980 void *UserData) { 3981 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3982 3983 FindHiddenVirtualMethodData &Data 3984 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 3985 3986 DeclarationName Name = Data.Method->getDeclName(); 3987 assert(Name.getNameKind() == DeclarationName::Identifier); 3988 3989 bool foundSameNameMethod = false; 3990 llvm::SmallVector<CXXMethodDecl *, 8> overloadedMethods; 3991 for (Path.Decls = BaseRecord->lookup(Name); 3992 Path.Decls.first != Path.Decls.second; 3993 ++Path.Decls.first) { 3994 NamedDecl *D = *Path.Decls.first; 3995 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3996 MD = MD->getCanonicalDecl(); 3997 foundSameNameMethod = true; 3998 // Interested only in hidden virtual methods. 3999 if (!MD->isVirtual()) 4000 continue; 4001 // If the method we are checking overrides a method from its base 4002 // don't warn about the other overloaded methods. 4003 if (!Data.S->IsOverload(Data.Method, MD, false)) 4004 return true; 4005 // Collect the overload only if its hidden. 4006 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4007 overloadedMethods.push_back(MD); 4008 } 4009 } 4010 4011 if (foundSameNameMethod) 4012 Data.OverloadedMethods.append(overloadedMethods.begin(), 4013 overloadedMethods.end()); 4014 return foundSameNameMethod; 4015} 4016 4017/// \brief See if a method overloads virtual methods in a base class without 4018/// overriding any. 4019void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4020 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4021 MD->getLocation()) == Diagnostic::Ignored) 4022 return; 4023 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4024 return; 4025 4026 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4027 /*bool RecordPaths=*/false, 4028 /*bool DetectVirtual=*/false); 4029 FindHiddenVirtualMethodData Data; 4030 Data.Method = MD; 4031 Data.S = this; 4032 4033 // Keep the base methods that were overriden or introduced in the subclass 4034 // by 'using' in a set. A base method not in this set is hidden. 4035 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4036 res.first != res.second; ++res.first) { 4037 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4038 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4039 E = MD->end_overridden_methods(); 4040 I != E; ++I) 4041 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4042 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4043 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4044 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4045 } 4046 4047 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4048 !Data.OverloadedMethods.empty()) { 4049 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4050 << MD << (Data.OverloadedMethods.size() > 1); 4051 4052 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4053 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4054 Diag(overloadedMD->getLocation(), 4055 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4056 } 4057 } 4058} 4059 4060void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4061 Decl *TagDecl, 4062 SourceLocation LBrac, 4063 SourceLocation RBrac, 4064 AttributeList *AttrList) { 4065 if (!TagDecl) 4066 return; 4067 4068 AdjustDeclIfTemplate(TagDecl); 4069 4070 ActOnFields(S, RLoc, TagDecl, 4071 // strict aliasing violation! 4072 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4073 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4074 4075 CheckCompletedCXXClass( 4076 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4077} 4078 4079/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4080/// special functions, such as the default constructor, copy 4081/// constructor, or destructor, to the given C++ class (C++ 4082/// [special]p1). This routine can only be executed just before the 4083/// definition of the class is complete. 4084void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4085 if (!ClassDecl->hasUserDeclaredConstructor()) 4086 ++ASTContext::NumImplicitDefaultConstructors; 4087 4088 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4089 ++ASTContext::NumImplicitCopyConstructors; 4090 4091 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4092 ++ASTContext::NumImplicitCopyAssignmentOperators; 4093 4094 // If we have a dynamic class, then the copy assignment operator may be 4095 // virtual, so we have to declare it immediately. This ensures that, e.g., 4096 // it shows up in the right place in the vtable and that we diagnose 4097 // problems with the implicit exception specification. 4098 if (ClassDecl->isDynamicClass()) 4099 DeclareImplicitCopyAssignment(ClassDecl); 4100 } 4101 4102 if (!ClassDecl->hasUserDeclaredDestructor()) { 4103 ++ASTContext::NumImplicitDestructors; 4104 4105 // If we have a dynamic class, then the destructor may be virtual, so we 4106 // have to declare the destructor immediately. This ensures that, e.g., it 4107 // shows up in the right place in the vtable and that we diagnose problems 4108 // with the implicit exception specification. 4109 if (ClassDecl->isDynamicClass()) 4110 DeclareImplicitDestructor(ClassDecl); 4111 } 4112} 4113 4114void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4115 if (!D) 4116 return; 4117 4118 int NumParamList = D->getNumTemplateParameterLists(); 4119 for (int i = 0; i < NumParamList; i++) { 4120 TemplateParameterList* Params = D->getTemplateParameterList(i); 4121 for (TemplateParameterList::iterator Param = Params->begin(), 4122 ParamEnd = Params->end(); 4123 Param != ParamEnd; ++Param) { 4124 NamedDecl *Named = cast<NamedDecl>(*Param); 4125 if (Named->getDeclName()) { 4126 S->AddDecl(Named); 4127 IdResolver.AddDecl(Named); 4128 } 4129 } 4130 } 4131} 4132 4133void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4134 if (!D) 4135 return; 4136 4137 TemplateParameterList *Params = 0; 4138 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4139 Params = Template->getTemplateParameters(); 4140 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4141 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4142 Params = PartialSpec->getTemplateParameters(); 4143 else 4144 return; 4145 4146 for (TemplateParameterList::iterator Param = Params->begin(), 4147 ParamEnd = Params->end(); 4148 Param != ParamEnd; ++Param) { 4149 NamedDecl *Named = cast<NamedDecl>(*Param); 4150 if (Named->getDeclName()) { 4151 S->AddDecl(Named); 4152 IdResolver.AddDecl(Named); 4153 } 4154 } 4155} 4156 4157void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4158 if (!RecordD) return; 4159 AdjustDeclIfTemplate(RecordD); 4160 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4161 PushDeclContext(S, Record); 4162} 4163 4164void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4165 if (!RecordD) return; 4166 PopDeclContext(); 4167} 4168 4169/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4170/// parsing a top-level (non-nested) C++ class, and we are now 4171/// parsing those parts of the given Method declaration that could 4172/// not be parsed earlier (C++ [class.mem]p2), such as default 4173/// arguments. This action should enter the scope of the given 4174/// Method declaration as if we had just parsed the qualified method 4175/// name. However, it should not bring the parameters into scope; 4176/// that will be performed by ActOnDelayedCXXMethodParameter. 4177void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4178} 4179 4180/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4181/// C++ method declaration. We're (re-)introducing the given 4182/// function parameter into scope for use in parsing later parts of 4183/// the method declaration. For example, we could see an 4184/// ActOnParamDefaultArgument event for this parameter. 4185void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4186 if (!ParamD) 4187 return; 4188 4189 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4190 4191 // If this parameter has an unparsed default argument, clear it out 4192 // to make way for the parsed default argument. 4193 if (Param->hasUnparsedDefaultArg()) 4194 Param->setDefaultArg(0); 4195 4196 S->AddDecl(Param); 4197 if (Param->getDeclName()) 4198 IdResolver.AddDecl(Param); 4199} 4200 4201/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4202/// processing the delayed method declaration for Method. The method 4203/// declaration is now considered finished. There may be a separate 4204/// ActOnStartOfFunctionDef action later (not necessarily 4205/// immediately!) for this method, if it was also defined inside the 4206/// class body. 4207void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4208 if (!MethodD) 4209 return; 4210 4211 AdjustDeclIfTemplate(MethodD); 4212 4213 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4214 4215 // Now that we have our default arguments, check the constructor 4216 // again. It could produce additional diagnostics or affect whether 4217 // the class has implicitly-declared destructors, among other 4218 // things. 4219 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4220 CheckConstructor(Constructor); 4221 4222 // Check the default arguments, which we may have added. 4223 if (!Method->isInvalidDecl()) 4224 CheckCXXDefaultArguments(Method); 4225} 4226 4227/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4228/// the well-formedness of the constructor declarator @p D with type @p 4229/// R. If there are any errors in the declarator, this routine will 4230/// emit diagnostics and set the invalid bit to true. In any case, the type 4231/// will be updated to reflect a well-formed type for the constructor and 4232/// returned. 4233QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4234 StorageClass &SC) { 4235 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4236 4237 // C++ [class.ctor]p3: 4238 // A constructor shall not be virtual (10.3) or static (9.4). A 4239 // constructor can be invoked for a const, volatile or const 4240 // volatile object. A constructor shall not be declared const, 4241 // volatile, or const volatile (9.3.2). 4242 if (isVirtual) { 4243 if (!D.isInvalidType()) 4244 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4245 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4246 << SourceRange(D.getIdentifierLoc()); 4247 D.setInvalidType(); 4248 } 4249 if (SC == SC_Static) { 4250 if (!D.isInvalidType()) 4251 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4252 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4253 << SourceRange(D.getIdentifierLoc()); 4254 D.setInvalidType(); 4255 SC = SC_None; 4256 } 4257 4258 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4259 if (FTI.TypeQuals != 0) { 4260 if (FTI.TypeQuals & Qualifiers::Const) 4261 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4262 << "const" << SourceRange(D.getIdentifierLoc()); 4263 if (FTI.TypeQuals & Qualifiers::Volatile) 4264 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4265 << "volatile" << SourceRange(D.getIdentifierLoc()); 4266 if (FTI.TypeQuals & Qualifiers::Restrict) 4267 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4268 << "restrict" << SourceRange(D.getIdentifierLoc()); 4269 D.setInvalidType(); 4270 } 4271 4272 // C++0x [class.ctor]p4: 4273 // A constructor shall not be declared with a ref-qualifier. 4274 if (FTI.hasRefQualifier()) { 4275 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4276 << FTI.RefQualifierIsLValueRef 4277 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4278 D.setInvalidType(); 4279 } 4280 4281 // Rebuild the function type "R" without any type qualifiers (in 4282 // case any of the errors above fired) and with "void" as the 4283 // return type, since constructors don't have return types. 4284 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4285 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4286 return R; 4287 4288 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4289 EPI.TypeQuals = 0; 4290 EPI.RefQualifier = RQ_None; 4291 4292 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4293 Proto->getNumArgs(), EPI); 4294} 4295 4296/// CheckConstructor - Checks a fully-formed constructor for 4297/// well-formedness, issuing any diagnostics required. Returns true if 4298/// the constructor declarator is invalid. 4299void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4300 CXXRecordDecl *ClassDecl 4301 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4302 if (!ClassDecl) 4303 return Constructor->setInvalidDecl(); 4304 4305 // C++ [class.copy]p3: 4306 // A declaration of a constructor for a class X is ill-formed if 4307 // its first parameter is of type (optionally cv-qualified) X and 4308 // either there are no other parameters or else all other 4309 // parameters have default arguments. 4310 if (!Constructor->isInvalidDecl() && 4311 ((Constructor->getNumParams() == 1) || 4312 (Constructor->getNumParams() > 1 && 4313 Constructor->getParamDecl(1)->hasDefaultArg())) && 4314 Constructor->getTemplateSpecializationKind() 4315 != TSK_ImplicitInstantiation) { 4316 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4317 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4318 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4319 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4320 const char *ConstRef 4321 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4322 : " const &"; 4323 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4324 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4325 4326 // FIXME: Rather that making the constructor invalid, we should endeavor 4327 // to fix the type. 4328 Constructor->setInvalidDecl(); 4329 } 4330 } 4331} 4332 4333/// CheckDestructor - Checks a fully-formed destructor definition for 4334/// well-formedness, issuing any diagnostics required. Returns true 4335/// on error. 4336bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4337 CXXRecordDecl *RD = Destructor->getParent(); 4338 4339 if (Destructor->isVirtual()) { 4340 SourceLocation Loc; 4341 4342 if (!Destructor->isImplicit()) 4343 Loc = Destructor->getLocation(); 4344 else 4345 Loc = RD->getLocation(); 4346 4347 // If we have a virtual destructor, look up the deallocation function 4348 FunctionDecl *OperatorDelete = 0; 4349 DeclarationName Name = 4350 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4351 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4352 return true; 4353 4354 MarkDeclarationReferenced(Loc, OperatorDelete); 4355 4356 Destructor->setOperatorDelete(OperatorDelete); 4357 } 4358 4359 return false; 4360} 4361 4362static inline bool 4363FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4364 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4365 FTI.ArgInfo[0].Param && 4366 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4367} 4368 4369/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4370/// the well-formednes of the destructor declarator @p D with type @p 4371/// R. If there are any errors in the declarator, this routine will 4372/// emit diagnostics and set the declarator to invalid. Even if this happens, 4373/// will be updated to reflect a well-formed type for the destructor and 4374/// returned. 4375QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4376 StorageClass& SC) { 4377 // C++ [class.dtor]p1: 4378 // [...] A typedef-name that names a class is a class-name 4379 // (7.1.3); however, a typedef-name that names a class shall not 4380 // be used as the identifier in the declarator for a destructor 4381 // declaration. 4382 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4383 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4384 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4385 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4386 else if (const TemplateSpecializationType *TST = 4387 DeclaratorType->getAs<TemplateSpecializationType>()) 4388 if (TST->isTypeAlias()) 4389 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4390 << DeclaratorType << 1; 4391 4392 // C++ [class.dtor]p2: 4393 // A destructor is used to destroy objects of its class type. A 4394 // destructor takes no parameters, and no return type can be 4395 // specified for it (not even void). The address of a destructor 4396 // shall not be taken. A destructor shall not be static. A 4397 // destructor can be invoked for a const, volatile or const 4398 // volatile object. A destructor shall not be declared const, 4399 // volatile or const volatile (9.3.2). 4400 if (SC == SC_Static) { 4401 if (!D.isInvalidType()) 4402 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4403 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4404 << SourceRange(D.getIdentifierLoc()) 4405 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4406 4407 SC = SC_None; 4408 } 4409 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4410 // Destructors don't have return types, but the parser will 4411 // happily parse something like: 4412 // 4413 // class X { 4414 // float ~X(); 4415 // }; 4416 // 4417 // The return type will be eliminated later. 4418 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4419 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4420 << SourceRange(D.getIdentifierLoc()); 4421 } 4422 4423 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4424 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4425 if (FTI.TypeQuals & Qualifiers::Const) 4426 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4427 << "const" << SourceRange(D.getIdentifierLoc()); 4428 if (FTI.TypeQuals & Qualifiers::Volatile) 4429 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4430 << "volatile" << SourceRange(D.getIdentifierLoc()); 4431 if (FTI.TypeQuals & Qualifiers::Restrict) 4432 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4433 << "restrict" << SourceRange(D.getIdentifierLoc()); 4434 D.setInvalidType(); 4435 } 4436 4437 // C++0x [class.dtor]p2: 4438 // A destructor shall not be declared with a ref-qualifier. 4439 if (FTI.hasRefQualifier()) { 4440 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4441 << FTI.RefQualifierIsLValueRef 4442 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4443 D.setInvalidType(); 4444 } 4445 4446 // Make sure we don't have any parameters. 4447 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4448 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4449 4450 // Delete the parameters. 4451 FTI.freeArgs(); 4452 D.setInvalidType(); 4453 } 4454 4455 // Make sure the destructor isn't variadic. 4456 if (FTI.isVariadic) { 4457 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4458 D.setInvalidType(); 4459 } 4460 4461 // Rebuild the function type "R" without any type qualifiers or 4462 // parameters (in case any of the errors above fired) and with 4463 // "void" as the return type, since destructors don't have return 4464 // types. 4465 if (!D.isInvalidType()) 4466 return R; 4467 4468 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4469 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4470 EPI.Variadic = false; 4471 EPI.TypeQuals = 0; 4472 EPI.RefQualifier = RQ_None; 4473 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4474} 4475 4476/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4477/// well-formednes of the conversion function declarator @p D with 4478/// type @p R. If there are any errors in the declarator, this routine 4479/// will emit diagnostics and return true. Otherwise, it will return 4480/// false. Either way, the type @p R will be updated to reflect a 4481/// well-formed type for the conversion operator. 4482void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4483 StorageClass& SC) { 4484 // C++ [class.conv.fct]p1: 4485 // Neither parameter types nor return type can be specified. The 4486 // type of a conversion function (8.3.5) is "function taking no 4487 // parameter returning conversion-type-id." 4488 if (SC == SC_Static) { 4489 if (!D.isInvalidType()) 4490 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4491 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4492 << SourceRange(D.getIdentifierLoc()); 4493 D.setInvalidType(); 4494 SC = SC_None; 4495 } 4496 4497 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4498 4499 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4500 // Conversion functions don't have return types, but the parser will 4501 // happily parse something like: 4502 // 4503 // class X { 4504 // float operator bool(); 4505 // }; 4506 // 4507 // The return type will be changed later anyway. 4508 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4509 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4510 << SourceRange(D.getIdentifierLoc()); 4511 D.setInvalidType(); 4512 } 4513 4514 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4515 4516 // Make sure we don't have any parameters. 4517 if (Proto->getNumArgs() > 0) { 4518 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4519 4520 // Delete the parameters. 4521 D.getFunctionTypeInfo().freeArgs(); 4522 D.setInvalidType(); 4523 } else if (Proto->isVariadic()) { 4524 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4525 D.setInvalidType(); 4526 } 4527 4528 // Diagnose "&operator bool()" and other such nonsense. This 4529 // is actually a gcc extension which we don't support. 4530 if (Proto->getResultType() != ConvType) { 4531 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4532 << Proto->getResultType(); 4533 D.setInvalidType(); 4534 ConvType = Proto->getResultType(); 4535 } 4536 4537 // C++ [class.conv.fct]p4: 4538 // The conversion-type-id shall not represent a function type nor 4539 // an array type. 4540 if (ConvType->isArrayType()) { 4541 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4542 ConvType = Context.getPointerType(ConvType); 4543 D.setInvalidType(); 4544 } else if (ConvType->isFunctionType()) { 4545 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4546 ConvType = Context.getPointerType(ConvType); 4547 D.setInvalidType(); 4548 } 4549 4550 // Rebuild the function type "R" without any parameters (in case any 4551 // of the errors above fired) and with the conversion type as the 4552 // return type. 4553 if (D.isInvalidType()) 4554 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4555 4556 // C++0x explicit conversion operators. 4557 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4558 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4559 diag::warn_explicit_conversion_functions) 4560 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4561} 4562 4563/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4564/// the declaration of the given C++ conversion function. This routine 4565/// is responsible for recording the conversion function in the C++ 4566/// class, if possible. 4567Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4568 assert(Conversion && "Expected to receive a conversion function declaration"); 4569 4570 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4571 4572 // Make sure we aren't redeclaring the conversion function. 4573 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4574 4575 // C++ [class.conv.fct]p1: 4576 // [...] A conversion function is never used to convert a 4577 // (possibly cv-qualified) object to the (possibly cv-qualified) 4578 // same object type (or a reference to it), to a (possibly 4579 // cv-qualified) base class of that type (or a reference to it), 4580 // or to (possibly cv-qualified) void. 4581 // FIXME: Suppress this warning if the conversion function ends up being a 4582 // virtual function that overrides a virtual function in a base class. 4583 QualType ClassType 4584 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4585 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4586 ConvType = ConvTypeRef->getPointeeType(); 4587 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4588 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4589 /* Suppress diagnostics for instantiations. */; 4590 else if (ConvType->isRecordType()) { 4591 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4592 if (ConvType == ClassType) 4593 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4594 << ClassType; 4595 else if (IsDerivedFrom(ClassType, ConvType)) 4596 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4597 << ClassType << ConvType; 4598 } else if (ConvType->isVoidType()) { 4599 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4600 << ClassType << ConvType; 4601 } 4602 4603 if (FunctionTemplateDecl *ConversionTemplate 4604 = Conversion->getDescribedFunctionTemplate()) 4605 return ConversionTemplate; 4606 4607 return Conversion; 4608} 4609 4610//===----------------------------------------------------------------------===// 4611// Namespace Handling 4612//===----------------------------------------------------------------------===// 4613 4614 4615 4616/// ActOnStartNamespaceDef - This is called at the start of a namespace 4617/// definition. 4618Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4619 SourceLocation InlineLoc, 4620 SourceLocation NamespaceLoc, 4621 SourceLocation IdentLoc, 4622 IdentifierInfo *II, 4623 SourceLocation LBrace, 4624 AttributeList *AttrList) { 4625 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4626 // For anonymous namespace, take the location of the left brace. 4627 SourceLocation Loc = II ? IdentLoc : LBrace; 4628 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4629 StartLoc, Loc, II); 4630 Namespc->setInline(InlineLoc.isValid()); 4631 4632 Scope *DeclRegionScope = NamespcScope->getParent(); 4633 4634 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4635 4636 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4637 PushNamespaceVisibilityAttr(Attr); 4638 4639 if (II) { 4640 // C++ [namespace.def]p2: 4641 // The identifier in an original-namespace-definition shall not 4642 // have been previously defined in the declarative region in 4643 // which the original-namespace-definition appears. The 4644 // identifier in an original-namespace-definition is the name of 4645 // the namespace. Subsequently in that declarative region, it is 4646 // treated as an original-namespace-name. 4647 // 4648 // Since namespace names are unique in their scope, and we don't 4649 // look through using directives, just look for any ordinary names. 4650 4651 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4652 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4653 Decl::IDNS_Namespace; 4654 NamedDecl *PrevDecl = 0; 4655 for (DeclContext::lookup_result R 4656 = CurContext->getRedeclContext()->lookup(II); 4657 R.first != R.second; ++R.first) { 4658 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4659 PrevDecl = *R.first; 4660 break; 4661 } 4662 } 4663 4664 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4665 // This is an extended namespace definition. 4666 if (Namespc->isInline() != OrigNS->isInline()) { 4667 // inline-ness must match 4668 if (OrigNS->isInline()) { 4669 // The user probably just forgot the 'inline', so suggest that it 4670 // be added back. 4671 Diag(Namespc->getLocation(), 4672 diag::warn_inline_namespace_reopened_noninline) 4673 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 4674 } else { 4675 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4676 << Namespc->isInline(); 4677 } 4678 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4679 4680 // Recover by ignoring the new namespace's inline status. 4681 Namespc->setInline(OrigNS->isInline()); 4682 } 4683 4684 // Attach this namespace decl to the chain of extended namespace 4685 // definitions. 4686 OrigNS->setNextNamespace(Namespc); 4687 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4688 4689 // Remove the previous declaration from the scope. 4690 if (DeclRegionScope->isDeclScope(OrigNS)) { 4691 IdResolver.RemoveDecl(OrigNS); 4692 DeclRegionScope->RemoveDecl(OrigNS); 4693 } 4694 } else if (PrevDecl) { 4695 // This is an invalid name redefinition. 4696 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4697 << Namespc->getDeclName(); 4698 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4699 Namespc->setInvalidDecl(); 4700 // Continue on to push Namespc as current DeclContext and return it. 4701 } else if (II->isStr("std") && 4702 CurContext->getRedeclContext()->isTranslationUnit()) { 4703 // This is the first "real" definition of the namespace "std", so update 4704 // our cache of the "std" namespace to point at this definition. 4705 if (NamespaceDecl *StdNS = getStdNamespace()) { 4706 // We had already defined a dummy namespace "std". Link this new 4707 // namespace definition to the dummy namespace "std". 4708 StdNS->setNextNamespace(Namespc); 4709 StdNS->setLocation(IdentLoc); 4710 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4711 } 4712 4713 // Make our StdNamespace cache point at the first real definition of the 4714 // "std" namespace. 4715 StdNamespace = Namespc; 4716 } 4717 4718 PushOnScopeChains(Namespc, DeclRegionScope); 4719 } else { 4720 // Anonymous namespaces. 4721 assert(Namespc->isAnonymousNamespace()); 4722 4723 // Link the anonymous namespace into its parent. 4724 NamespaceDecl *PrevDecl; 4725 DeclContext *Parent = CurContext->getRedeclContext(); 4726 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4727 PrevDecl = TU->getAnonymousNamespace(); 4728 TU->setAnonymousNamespace(Namespc); 4729 } else { 4730 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4731 PrevDecl = ND->getAnonymousNamespace(); 4732 ND->setAnonymousNamespace(Namespc); 4733 } 4734 4735 // Link the anonymous namespace with its previous declaration. 4736 if (PrevDecl) { 4737 assert(PrevDecl->isAnonymousNamespace()); 4738 assert(!PrevDecl->getNextNamespace()); 4739 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4740 PrevDecl->setNextNamespace(Namespc); 4741 4742 if (Namespc->isInline() != PrevDecl->isInline()) { 4743 // inline-ness must match 4744 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4745 << Namespc->isInline(); 4746 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4747 Namespc->setInvalidDecl(); 4748 // Recover by ignoring the new namespace's inline status. 4749 Namespc->setInline(PrevDecl->isInline()); 4750 } 4751 } 4752 4753 CurContext->addDecl(Namespc); 4754 4755 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4756 // behaves as if it were replaced by 4757 // namespace unique { /* empty body */ } 4758 // using namespace unique; 4759 // namespace unique { namespace-body } 4760 // where all occurrences of 'unique' in a translation unit are 4761 // replaced by the same identifier and this identifier differs 4762 // from all other identifiers in the entire program. 4763 4764 // We just create the namespace with an empty name and then add an 4765 // implicit using declaration, just like the standard suggests. 4766 // 4767 // CodeGen enforces the "universally unique" aspect by giving all 4768 // declarations semantically contained within an anonymous 4769 // namespace internal linkage. 4770 4771 if (!PrevDecl) { 4772 UsingDirectiveDecl* UD 4773 = UsingDirectiveDecl::Create(Context, CurContext, 4774 /* 'using' */ LBrace, 4775 /* 'namespace' */ SourceLocation(), 4776 /* qualifier */ NestedNameSpecifierLoc(), 4777 /* identifier */ SourceLocation(), 4778 Namespc, 4779 /* Ancestor */ CurContext); 4780 UD->setImplicit(); 4781 CurContext->addDecl(UD); 4782 } 4783 } 4784 4785 // Although we could have an invalid decl (i.e. the namespace name is a 4786 // redefinition), push it as current DeclContext and try to continue parsing. 4787 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4788 // for the namespace has the declarations that showed up in that particular 4789 // namespace definition. 4790 PushDeclContext(NamespcScope, Namespc); 4791 return Namespc; 4792} 4793 4794/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4795/// is a namespace alias, returns the namespace it points to. 4796static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4797 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4798 return AD->getNamespace(); 4799 return dyn_cast_or_null<NamespaceDecl>(D); 4800} 4801 4802/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4803/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4804void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4805 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4806 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4807 Namespc->setRBraceLoc(RBrace); 4808 PopDeclContext(); 4809 if (Namespc->hasAttr<VisibilityAttr>()) 4810 PopPragmaVisibility(); 4811} 4812 4813CXXRecordDecl *Sema::getStdBadAlloc() const { 4814 return cast_or_null<CXXRecordDecl>( 4815 StdBadAlloc.get(Context.getExternalSource())); 4816} 4817 4818NamespaceDecl *Sema::getStdNamespace() const { 4819 return cast_or_null<NamespaceDecl>( 4820 StdNamespace.get(Context.getExternalSource())); 4821} 4822 4823/// \brief Retrieve the special "std" namespace, which may require us to 4824/// implicitly define the namespace. 4825NamespaceDecl *Sema::getOrCreateStdNamespace() { 4826 if (!StdNamespace) { 4827 // The "std" namespace has not yet been defined, so build one implicitly. 4828 StdNamespace = NamespaceDecl::Create(Context, 4829 Context.getTranslationUnitDecl(), 4830 SourceLocation(), SourceLocation(), 4831 &PP.getIdentifierTable().get("std")); 4832 getStdNamespace()->setImplicit(true); 4833 } 4834 4835 return getStdNamespace(); 4836} 4837 4838/// \brief Determine whether a using statement is in a context where it will be 4839/// apply in all contexts. 4840static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4841 switch (CurContext->getDeclKind()) { 4842 case Decl::TranslationUnit: 4843 return true; 4844 case Decl::LinkageSpec: 4845 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4846 default: 4847 return false; 4848 } 4849} 4850 4851Decl *Sema::ActOnUsingDirective(Scope *S, 4852 SourceLocation UsingLoc, 4853 SourceLocation NamespcLoc, 4854 CXXScopeSpec &SS, 4855 SourceLocation IdentLoc, 4856 IdentifierInfo *NamespcName, 4857 AttributeList *AttrList) { 4858 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4859 assert(NamespcName && "Invalid NamespcName."); 4860 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4861 4862 // This can only happen along a recovery path. 4863 while (S->getFlags() & Scope::TemplateParamScope) 4864 S = S->getParent(); 4865 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4866 4867 UsingDirectiveDecl *UDir = 0; 4868 NestedNameSpecifier *Qualifier = 0; 4869 if (SS.isSet()) 4870 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4871 4872 // Lookup namespace name. 4873 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4874 LookupParsedName(R, S, &SS); 4875 if (R.isAmbiguous()) 4876 return 0; 4877 4878 if (R.empty()) { 4879 // Allow "using namespace std;" or "using namespace ::std;" even if 4880 // "std" hasn't been defined yet, for GCC compatibility. 4881 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4882 NamespcName->isStr("std")) { 4883 Diag(IdentLoc, diag::ext_using_undefined_std); 4884 R.addDecl(getOrCreateStdNamespace()); 4885 R.resolveKind(); 4886 } 4887 // Otherwise, attempt typo correction. 4888 else if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 4889 CTC_NoKeywords, 0)) { 4890 if (R.getAsSingle<NamespaceDecl>() || 4891 R.getAsSingle<NamespaceAliasDecl>()) { 4892 if (DeclContext *DC = computeDeclContext(SS, false)) 4893 Diag(IdentLoc, diag::err_using_directive_member_suggest) 4894 << NamespcName << DC << Corrected << SS.getRange() 4895 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4896 else 4897 Diag(IdentLoc, diag::err_using_directive_suggest) 4898 << NamespcName << Corrected 4899 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 4900 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 4901 << Corrected; 4902 4903 NamespcName = Corrected.getAsIdentifierInfo(); 4904 } else { 4905 R.clear(); 4906 R.setLookupName(NamespcName); 4907 } 4908 } 4909 } 4910 4911 if (!R.empty()) { 4912 NamedDecl *Named = R.getFoundDecl(); 4913 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4914 && "expected namespace decl"); 4915 // C++ [namespace.udir]p1: 4916 // A using-directive specifies that the names in the nominated 4917 // namespace can be used in the scope in which the 4918 // using-directive appears after the using-directive. During 4919 // unqualified name lookup (3.4.1), the names appear as if they 4920 // were declared in the nearest enclosing namespace which 4921 // contains both the using-directive and the nominated 4922 // namespace. [Note: in this context, "contains" means "contains 4923 // directly or indirectly". ] 4924 4925 // Find enclosing context containing both using-directive and 4926 // nominated namespace. 4927 NamespaceDecl *NS = getNamespaceDecl(Named); 4928 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4929 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4930 CommonAncestor = CommonAncestor->getParent(); 4931 4932 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4933 SS.getWithLocInContext(Context), 4934 IdentLoc, Named, CommonAncestor); 4935 4936 if (IsUsingDirectiveInToplevelContext(CurContext) && 4937 !SourceMgr.isFromMainFile(SourceMgr.getInstantiationLoc(IdentLoc))) { 4938 Diag(IdentLoc, diag::warn_using_directive_in_header); 4939 } 4940 4941 PushUsingDirective(S, UDir); 4942 } else { 4943 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4944 } 4945 4946 // FIXME: We ignore attributes for now. 4947 return UDir; 4948} 4949 4950void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 4951 // If scope has associated entity, then using directive is at namespace 4952 // or translation unit scope. We add UsingDirectiveDecls, into 4953 // it's lookup structure. 4954 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 4955 Ctx->addDecl(UDir); 4956 else 4957 // Otherwise it is block-sope. using-directives will affect lookup 4958 // only to the end of scope. 4959 S->PushUsingDirective(UDir); 4960} 4961 4962 4963Decl *Sema::ActOnUsingDeclaration(Scope *S, 4964 AccessSpecifier AS, 4965 bool HasUsingKeyword, 4966 SourceLocation UsingLoc, 4967 CXXScopeSpec &SS, 4968 UnqualifiedId &Name, 4969 AttributeList *AttrList, 4970 bool IsTypeName, 4971 SourceLocation TypenameLoc) { 4972 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4973 4974 switch (Name.getKind()) { 4975 case UnqualifiedId::IK_Identifier: 4976 case UnqualifiedId::IK_OperatorFunctionId: 4977 case UnqualifiedId::IK_LiteralOperatorId: 4978 case UnqualifiedId::IK_ConversionFunctionId: 4979 break; 4980 4981 case UnqualifiedId::IK_ConstructorName: 4982 case UnqualifiedId::IK_ConstructorTemplateId: 4983 // C++0x inherited constructors. 4984 if (getLangOptions().CPlusPlus0x) break; 4985 4986 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 4987 << SS.getRange(); 4988 return 0; 4989 4990 case UnqualifiedId::IK_DestructorName: 4991 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 4992 << SS.getRange(); 4993 return 0; 4994 4995 case UnqualifiedId::IK_TemplateId: 4996 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 4997 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 4998 return 0; 4999 } 5000 5001 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5002 DeclarationName TargetName = TargetNameInfo.getName(); 5003 if (!TargetName) 5004 return 0; 5005 5006 // Warn about using declarations. 5007 // TODO: store that the declaration was written without 'using' and 5008 // talk about access decls instead of using decls in the 5009 // diagnostics. 5010 if (!HasUsingKeyword) { 5011 UsingLoc = Name.getSourceRange().getBegin(); 5012 5013 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5014 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5015 } 5016 5017 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5018 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5019 return 0; 5020 5021 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5022 TargetNameInfo, AttrList, 5023 /* IsInstantiation */ false, 5024 IsTypeName, TypenameLoc); 5025 if (UD) 5026 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5027 5028 return UD; 5029} 5030 5031/// \brief Determine whether a using declaration considers the given 5032/// declarations as "equivalent", e.g., if they are redeclarations of 5033/// the same entity or are both typedefs of the same type. 5034static bool 5035IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5036 bool &SuppressRedeclaration) { 5037 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5038 SuppressRedeclaration = false; 5039 return true; 5040 } 5041 5042 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5043 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5044 SuppressRedeclaration = true; 5045 return Context.hasSameType(TD1->getUnderlyingType(), 5046 TD2->getUnderlyingType()); 5047 } 5048 5049 return false; 5050} 5051 5052 5053/// Determines whether to create a using shadow decl for a particular 5054/// decl, given the set of decls existing prior to this using lookup. 5055bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5056 const LookupResult &Previous) { 5057 // Diagnose finding a decl which is not from a base class of the 5058 // current class. We do this now because there are cases where this 5059 // function will silently decide not to build a shadow decl, which 5060 // will pre-empt further diagnostics. 5061 // 5062 // We don't need to do this in C++0x because we do the check once on 5063 // the qualifier. 5064 // 5065 // FIXME: diagnose the following if we care enough: 5066 // struct A { int foo; }; 5067 // struct B : A { using A::foo; }; 5068 // template <class T> struct C : A {}; 5069 // template <class T> struct D : C<T> { using B::foo; } // <--- 5070 // This is invalid (during instantiation) in C++03 because B::foo 5071 // resolves to the using decl in B, which is not a base class of D<T>. 5072 // We can't diagnose it immediately because C<T> is an unknown 5073 // specialization. The UsingShadowDecl in D<T> then points directly 5074 // to A::foo, which will look well-formed when we instantiate. 5075 // The right solution is to not collapse the shadow-decl chain. 5076 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5077 DeclContext *OrigDC = Orig->getDeclContext(); 5078 5079 // Handle enums and anonymous structs. 5080 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5081 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5082 while (OrigRec->isAnonymousStructOrUnion()) 5083 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5084 5085 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5086 if (OrigDC == CurContext) { 5087 Diag(Using->getLocation(), 5088 diag::err_using_decl_nested_name_specifier_is_current_class) 5089 << Using->getQualifierLoc().getSourceRange(); 5090 Diag(Orig->getLocation(), diag::note_using_decl_target); 5091 return true; 5092 } 5093 5094 Diag(Using->getQualifierLoc().getBeginLoc(), 5095 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5096 << Using->getQualifier() 5097 << cast<CXXRecordDecl>(CurContext) 5098 << Using->getQualifierLoc().getSourceRange(); 5099 Diag(Orig->getLocation(), diag::note_using_decl_target); 5100 return true; 5101 } 5102 } 5103 5104 if (Previous.empty()) return false; 5105 5106 NamedDecl *Target = Orig; 5107 if (isa<UsingShadowDecl>(Target)) 5108 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5109 5110 // If the target happens to be one of the previous declarations, we 5111 // don't have a conflict. 5112 // 5113 // FIXME: but we might be increasing its access, in which case we 5114 // should redeclare it. 5115 NamedDecl *NonTag = 0, *Tag = 0; 5116 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5117 I != E; ++I) { 5118 NamedDecl *D = (*I)->getUnderlyingDecl(); 5119 bool Result; 5120 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5121 return Result; 5122 5123 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5124 } 5125 5126 if (Target->isFunctionOrFunctionTemplate()) { 5127 FunctionDecl *FD; 5128 if (isa<FunctionTemplateDecl>(Target)) 5129 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5130 else 5131 FD = cast<FunctionDecl>(Target); 5132 5133 NamedDecl *OldDecl = 0; 5134 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5135 case Ovl_Overload: 5136 return false; 5137 5138 case Ovl_NonFunction: 5139 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5140 break; 5141 5142 // We found a decl with the exact signature. 5143 case Ovl_Match: 5144 // If we're in a record, we want to hide the target, so we 5145 // return true (without a diagnostic) to tell the caller not to 5146 // build a shadow decl. 5147 if (CurContext->isRecord()) 5148 return true; 5149 5150 // If we're not in a record, this is an error. 5151 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5152 break; 5153 } 5154 5155 Diag(Target->getLocation(), diag::note_using_decl_target); 5156 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5157 return true; 5158 } 5159 5160 // Target is not a function. 5161 5162 if (isa<TagDecl>(Target)) { 5163 // No conflict between a tag and a non-tag. 5164 if (!Tag) return false; 5165 5166 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5167 Diag(Target->getLocation(), diag::note_using_decl_target); 5168 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5169 return true; 5170 } 5171 5172 // No conflict between a tag and a non-tag. 5173 if (!NonTag) return false; 5174 5175 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5176 Diag(Target->getLocation(), diag::note_using_decl_target); 5177 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5178 return true; 5179} 5180 5181/// Builds a shadow declaration corresponding to a 'using' declaration. 5182UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5183 UsingDecl *UD, 5184 NamedDecl *Orig) { 5185 5186 // If we resolved to another shadow declaration, just coalesce them. 5187 NamedDecl *Target = Orig; 5188 if (isa<UsingShadowDecl>(Target)) { 5189 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5190 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5191 } 5192 5193 UsingShadowDecl *Shadow 5194 = UsingShadowDecl::Create(Context, CurContext, 5195 UD->getLocation(), UD, Target); 5196 UD->addShadowDecl(Shadow); 5197 5198 Shadow->setAccess(UD->getAccess()); 5199 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5200 Shadow->setInvalidDecl(); 5201 5202 if (S) 5203 PushOnScopeChains(Shadow, S); 5204 else 5205 CurContext->addDecl(Shadow); 5206 5207 5208 return Shadow; 5209} 5210 5211/// Hides a using shadow declaration. This is required by the current 5212/// using-decl implementation when a resolvable using declaration in a 5213/// class is followed by a declaration which would hide or override 5214/// one or more of the using decl's targets; for example: 5215/// 5216/// struct Base { void foo(int); }; 5217/// struct Derived : Base { 5218/// using Base::foo; 5219/// void foo(int); 5220/// }; 5221/// 5222/// The governing language is C++03 [namespace.udecl]p12: 5223/// 5224/// When a using-declaration brings names from a base class into a 5225/// derived class scope, member functions in the derived class 5226/// override and/or hide member functions with the same name and 5227/// parameter types in a base class (rather than conflicting). 5228/// 5229/// There are two ways to implement this: 5230/// (1) optimistically create shadow decls when they're not hidden 5231/// by existing declarations, or 5232/// (2) don't create any shadow decls (or at least don't make them 5233/// visible) until we've fully parsed/instantiated the class. 5234/// The problem with (1) is that we might have to retroactively remove 5235/// a shadow decl, which requires several O(n) operations because the 5236/// decl structures are (very reasonably) not designed for removal. 5237/// (2) avoids this but is very fiddly and phase-dependent. 5238void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5239 if (Shadow->getDeclName().getNameKind() == 5240 DeclarationName::CXXConversionFunctionName) 5241 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5242 5243 // Remove it from the DeclContext... 5244 Shadow->getDeclContext()->removeDecl(Shadow); 5245 5246 // ...and the scope, if applicable... 5247 if (S) { 5248 S->RemoveDecl(Shadow); 5249 IdResolver.RemoveDecl(Shadow); 5250 } 5251 5252 // ...and the using decl. 5253 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5254 5255 // TODO: complain somehow if Shadow was used. It shouldn't 5256 // be possible for this to happen, because...? 5257} 5258 5259/// Builds a using declaration. 5260/// 5261/// \param IsInstantiation - Whether this call arises from an 5262/// instantiation of an unresolved using declaration. We treat 5263/// the lookup differently for these declarations. 5264NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5265 SourceLocation UsingLoc, 5266 CXXScopeSpec &SS, 5267 const DeclarationNameInfo &NameInfo, 5268 AttributeList *AttrList, 5269 bool IsInstantiation, 5270 bool IsTypeName, 5271 SourceLocation TypenameLoc) { 5272 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5273 SourceLocation IdentLoc = NameInfo.getLoc(); 5274 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5275 5276 // FIXME: We ignore attributes for now. 5277 5278 if (SS.isEmpty()) { 5279 Diag(IdentLoc, diag::err_using_requires_qualname); 5280 return 0; 5281 } 5282 5283 // Do the redeclaration lookup in the current scope. 5284 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5285 ForRedeclaration); 5286 Previous.setHideTags(false); 5287 if (S) { 5288 LookupName(Previous, S); 5289 5290 // It is really dumb that we have to do this. 5291 LookupResult::Filter F = Previous.makeFilter(); 5292 while (F.hasNext()) { 5293 NamedDecl *D = F.next(); 5294 if (!isDeclInScope(D, CurContext, S)) 5295 F.erase(); 5296 } 5297 F.done(); 5298 } else { 5299 assert(IsInstantiation && "no scope in non-instantiation"); 5300 assert(CurContext->isRecord() && "scope not record in instantiation"); 5301 LookupQualifiedName(Previous, CurContext); 5302 } 5303 5304 // Check for invalid redeclarations. 5305 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5306 return 0; 5307 5308 // Check for bad qualifiers. 5309 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5310 return 0; 5311 5312 DeclContext *LookupContext = computeDeclContext(SS); 5313 NamedDecl *D; 5314 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5315 if (!LookupContext) { 5316 if (IsTypeName) { 5317 // FIXME: not all declaration name kinds are legal here 5318 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5319 UsingLoc, TypenameLoc, 5320 QualifierLoc, 5321 IdentLoc, NameInfo.getName()); 5322 } else { 5323 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5324 QualifierLoc, NameInfo); 5325 } 5326 } else { 5327 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5328 NameInfo, IsTypeName); 5329 } 5330 D->setAccess(AS); 5331 CurContext->addDecl(D); 5332 5333 if (!LookupContext) return D; 5334 UsingDecl *UD = cast<UsingDecl>(D); 5335 5336 if (RequireCompleteDeclContext(SS, LookupContext)) { 5337 UD->setInvalidDecl(); 5338 return UD; 5339 } 5340 5341 // Constructor inheriting using decls get special treatment. 5342 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5343 if (CheckInheritedConstructorUsingDecl(UD)) 5344 UD->setInvalidDecl(); 5345 return UD; 5346 } 5347 5348 // Otherwise, look up the target name. 5349 5350 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5351 R.setUsingDeclaration(true); 5352 5353 // Unlike most lookups, we don't always want to hide tag 5354 // declarations: tag names are visible through the using declaration 5355 // even if hidden by ordinary names, *except* in a dependent context 5356 // where it's important for the sanity of two-phase lookup. 5357 if (!IsInstantiation) 5358 R.setHideTags(false); 5359 5360 LookupQualifiedName(R, LookupContext); 5361 5362 if (R.empty()) { 5363 Diag(IdentLoc, diag::err_no_member) 5364 << NameInfo.getName() << LookupContext << SS.getRange(); 5365 UD->setInvalidDecl(); 5366 return UD; 5367 } 5368 5369 if (R.isAmbiguous()) { 5370 UD->setInvalidDecl(); 5371 return UD; 5372 } 5373 5374 if (IsTypeName) { 5375 // If we asked for a typename and got a non-type decl, error out. 5376 if (!R.getAsSingle<TypeDecl>()) { 5377 Diag(IdentLoc, diag::err_using_typename_non_type); 5378 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5379 Diag((*I)->getUnderlyingDecl()->getLocation(), 5380 diag::note_using_decl_target); 5381 UD->setInvalidDecl(); 5382 return UD; 5383 } 5384 } else { 5385 // If we asked for a non-typename and we got a type, error out, 5386 // but only if this is an instantiation of an unresolved using 5387 // decl. Otherwise just silently find the type name. 5388 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5389 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5390 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5391 UD->setInvalidDecl(); 5392 return UD; 5393 } 5394 } 5395 5396 // C++0x N2914 [namespace.udecl]p6: 5397 // A using-declaration shall not name a namespace. 5398 if (R.getAsSingle<NamespaceDecl>()) { 5399 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5400 << SS.getRange(); 5401 UD->setInvalidDecl(); 5402 return UD; 5403 } 5404 5405 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5406 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5407 BuildUsingShadowDecl(S, UD, *I); 5408 } 5409 5410 return UD; 5411} 5412 5413/// Additional checks for a using declaration referring to a constructor name. 5414bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5415 if (UD->isTypeName()) { 5416 // FIXME: Cannot specify typename when specifying constructor 5417 return true; 5418 } 5419 5420 const Type *SourceType = UD->getQualifier()->getAsType(); 5421 assert(SourceType && 5422 "Using decl naming constructor doesn't have type in scope spec."); 5423 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5424 5425 // Check whether the named type is a direct base class. 5426 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5427 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5428 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5429 BaseIt != BaseE; ++BaseIt) { 5430 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5431 if (CanonicalSourceType == BaseType) 5432 break; 5433 } 5434 5435 if (BaseIt == BaseE) { 5436 // Did not find SourceType in the bases. 5437 Diag(UD->getUsingLocation(), 5438 diag::err_using_decl_constructor_not_in_direct_base) 5439 << UD->getNameInfo().getSourceRange() 5440 << QualType(SourceType, 0) << TargetClass; 5441 return true; 5442 } 5443 5444 BaseIt->setInheritConstructors(); 5445 5446 return false; 5447} 5448 5449/// Checks that the given using declaration is not an invalid 5450/// redeclaration. Note that this is checking only for the using decl 5451/// itself, not for any ill-formedness among the UsingShadowDecls. 5452bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5453 bool isTypeName, 5454 const CXXScopeSpec &SS, 5455 SourceLocation NameLoc, 5456 const LookupResult &Prev) { 5457 // C++03 [namespace.udecl]p8: 5458 // C++0x [namespace.udecl]p10: 5459 // A using-declaration is a declaration and can therefore be used 5460 // repeatedly where (and only where) multiple declarations are 5461 // allowed. 5462 // 5463 // That's in non-member contexts. 5464 if (!CurContext->getRedeclContext()->isRecord()) 5465 return false; 5466 5467 NestedNameSpecifier *Qual 5468 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5469 5470 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5471 NamedDecl *D = *I; 5472 5473 bool DTypename; 5474 NestedNameSpecifier *DQual; 5475 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5476 DTypename = UD->isTypeName(); 5477 DQual = UD->getQualifier(); 5478 } else if (UnresolvedUsingValueDecl *UD 5479 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5480 DTypename = false; 5481 DQual = UD->getQualifier(); 5482 } else if (UnresolvedUsingTypenameDecl *UD 5483 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5484 DTypename = true; 5485 DQual = UD->getQualifier(); 5486 } else continue; 5487 5488 // using decls differ if one says 'typename' and the other doesn't. 5489 // FIXME: non-dependent using decls? 5490 if (isTypeName != DTypename) continue; 5491 5492 // using decls differ if they name different scopes (but note that 5493 // template instantiation can cause this check to trigger when it 5494 // didn't before instantiation). 5495 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5496 Context.getCanonicalNestedNameSpecifier(DQual)) 5497 continue; 5498 5499 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5500 Diag(D->getLocation(), diag::note_using_decl) << 1; 5501 return true; 5502 } 5503 5504 return false; 5505} 5506 5507 5508/// Checks that the given nested-name qualifier used in a using decl 5509/// in the current context is appropriately related to the current 5510/// scope. If an error is found, diagnoses it and returns true. 5511bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5512 const CXXScopeSpec &SS, 5513 SourceLocation NameLoc) { 5514 DeclContext *NamedContext = computeDeclContext(SS); 5515 5516 if (!CurContext->isRecord()) { 5517 // C++03 [namespace.udecl]p3: 5518 // C++0x [namespace.udecl]p8: 5519 // A using-declaration for a class member shall be a member-declaration. 5520 5521 // If we weren't able to compute a valid scope, it must be a 5522 // dependent class scope. 5523 if (!NamedContext || NamedContext->isRecord()) { 5524 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5525 << SS.getRange(); 5526 return true; 5527 } 5528 5529 // Otherwise, everything is known to be fine. 5530 return false; 5531 } 5532 5533 // The current scope is a record. 5534 5535 // If the named context is dependent, we can't decide much. 5536 if (!NamedContext) { 5537 // FIXME: in C++0x, we can diagnose if we can prove that the 5538 // nested-name-specifier does not refer to a base class, which is 5539 // still possible in some cases. 5540 5541 // Otherwise we have to conservatively report that things might be 5542 // okay. 5543 return false; 5544 } 5545 5546 if (!NamedContext->isRecord()) { 5547 // Ideally this would point at the last name in the specifier, 5548 // but we don't have that level of source info. 5549 Diag(SS.getRange().getBegin(), 5550 diag::err_using_decl_nested_name_specifier_is_not_class) 5551 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5552 return true; 5553 } 5554 5555 if (!NamedContext->isDependentContext() && 5556 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5557 return true; 5558 5559 if (getLangOptions().CPlusPlus0x) { 5560 // C++0x [namespace.udecl]p3: 5561 // In a using-declaration used as a member-declaration, the 5562 // nested-name-specifier shall name a base class of the class 5563 // being defined. 5564 5565 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5566 cast<CXXRecordDecl>(NamedContext))) { 5567 if (CurContext == NamedContext) { 5568 Diag(NameLoc, 5569 diag::err_using_decl_nested_name_specifier_is_current_class) 5570 << SS.getRange(); 5571 return true; 5572 } 5573 5574 Diag(SS.getRange().getBegin(), 5575 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5576 << (NestedNameSpecifier*) SS.getScopeRep() 5577 << cast<CXXRecordDecl>(CurContext) 5578 << SS.getRange(); 5579 return true; 5580 } 5581 5582 return false; 5583 } 5584 5585 // C++03 [namespace.udecl]p4: 5586 // A using-declaration used as a member-declaration shall refer 5587 // to a member of a base class of the class being defined [etc.]. 5588 5589 // Salient point: SS doesn't have to name a base class as long as 5590 // lookup only finds members from base classes. Therefore we can 5591 // diagnose here only if we can prove that that can't happen, 5592 // i.e. if the class hierarchies provably don't intersect. 5593 5594 // TODO: it would be nice if "definitely valid" results were cached 5595 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5596 // need to be repeated. 5597 5598 struct UserData { 5599 llvm::DenseSet<const CXXRecordDecl*> Bases; 5600 5601 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5602 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5603 Data->Bases.insert(Base); 5604 return true; 5605 } 5606 5607 bool hasDependentBases(const CXXRecordDecl *Class) { 5608 return !Class->forallBases(collect, this); 5609 } 5610 5611 /// Returns true if the base is dependent or is one of the 5612 /// accumulated base classes. 5613 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5614 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5615 return !Data->Bases.count(Base); 5616 } 5617 5618 bool mightShareBases(const CXXRecordDecl *Class) { 5619 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5620 } 5621 }; 5622 5623 UserData Data; 5624 5625 // Returns false if we find a dependent base. 5626 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5627 return false; 5628 5629 // Returns false if the class has a dependent base or if it or one 5630 // of its bases is present in the base set of the current context. 5631 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5632 return false; 5633 5634 Diag(SS.getRange().getBegin(), 5635 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5636 << (NestedNameSpecifier*) SS.getScopeRep() 5637 << cast<CXXRecordDecl>(CurContext) 5638 << SS.getRange(); 5639 5640 return true; 5641} 5642 5643Decl *Sema::ActOnAliasDeclaration(Scope *S, 5644 AccessSpecifier AS, 5645 MultiTemplateParamsArg TemplateParamLists, 5646 SourceLocation UsingLoc, 5647 UnqualifiedId &Name, 5648 TypeResult Type) { 5649 // Skip up to the relevant declaration scope. 5650 while (S->getFlags() & Scope::TemplateParamScope) 5651 S = S->getParent(); 5652 assert((S->getFlags() & Scope::DeclScope) && 5653 "got alias-declaration outside of declaration scope"); 5654 5655 if (Type.isInvalid()) 5656 return 0; 5657 5658 bool Invalid = false; 5659 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5660 TypeSourceInfo *TInfo = 0; 5661 GetTypeFromParser(Type.get(), &TInfo); 5662 5663 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5664 return 0; 5665 5666 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5667 UPPC_DeclarationType)) { 5668 Invalid = true; 5669 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5670 TInfo->getTypeLoc().getBeginLoc()); 5671 } 5672 5673 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5674 LookupName(Previous, S); 5675 5676 // Warn about shadowing the name of a template parameter. 5677 if (Previous.isSingleResult() && 5678 Previous.getFoundDecl()->isTemplateParameter()) { 5679 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5680 Previous.getFoundDecl())) 5681 Invalid = true; 5682 Previous.clear(); 5683 } 5684 5685 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5686 "name in alias declaration must be an identifier"); 5687 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5688 Name.StartLocation, 5689 Name.Identifier, TInfo); 5690 5691 NewTD->setAccess(AS); 5692 5693 if (Invalid) 5694 NewTD->setInvalidDecl(); 5695 5696 CheckTypedefForVariablyModifiedType(S, NewTD); 5697 Invalid |= NewTD->isInvalidDecl(); 5698 5699 bool Redeclaration = false; 5700 5701 NamedDecl *NewND; 5702 if (TemplateParamLists.size()) { 5703 TypeAliasTemplateDecl *OldDecl = 0; 5704 TemplateParameterList *OldTemplateParams = 0; 5705 5706 if (TemplateParamLists.size() != 1) { 5707 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5708 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5709 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5710 } 5711 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5712 5713 // Only consider previous declarations in the same scope. 5714 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5715 /*ExplicitInstantiationOrSpecialization*/false); 5716 if (!Previous.empty()) { 5717 Redeclaration = true; 5718 5719 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5720 if (!OldDecl && !Invalid) { 5721 Diag(UsingLoc, diag::err_redefinition_different_kind) 5722 << Name.Identifier; 5723 5724 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5725 if (OldD->getLocation().isValid()) 5726 Diag(OldD->getLocation(), diag::note_previous_definition); 5727 5728 Invalid = true; 5729 } 5730 5731 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5732 if (TemplateParameterListsAreEqual(TemplateParams, 5733 OldDecl->getTemplateParameters(), 5734 /*Complain=*/true, 5735 TPL_TemplateMatch)) 5736 OldTemplateParams = OldDecl->getTemplateParameters(); 5737 else 5738 Invalid = true; 5739 5740 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5741 if (!Invalid && 5742 !Context.hasSameType(OldTD->getUnderlyingType(), 5743 NewTD->getUnderlyingType())) { 5744 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5745 // but we can't reasonably accept it. 5746 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5747 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5748 if (OldTD->getLocation().isValid()) 5749 Diag(OldTD->getLocation(), diag::note_previous_definition); 5750 Invalid = true; 5751 } 5752 } 5753 } 5754 5755 // Merge any previous default template arguments into our parameters, 5756 // and check the parameter list. 5757 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5758 TPC_TypeAliasTemplate)) 5759 return 0; 5760 5761 TypeAliasTemplateDecl *NewDecl = 5762 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5763 Name.Identifier, TemplateParams, 5764 NewTD); 5765 5766 NewDecl->setAccess(AS); 5767 5768 if (Invalid) 5769 NewDecl->setInvalidDecl(); 5770 else if (OldDecl) 5771 NewDecl->setPreviousDeclaration(OldDecl); 5772 5773 NewND = NewDecl; 5774 } else { 5775 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5776 NewND = NewTD; 5777 } 5778 5779 if (!Redeclaration) 5780 PushOnScopeChains(NewND, S); 5781 5782 return NewND; 5783} 5784 5785Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5786 SourceLocation NamespaceLoc, 5787 SourceLocation AliasLoc, 5788 IdentifierInfo *Alias, 5789 CXXScopeSpec &SS, 5790 SourceLocation IdentLoc, 5791 IdentifierInfo *Ident) { 5792 5793 // Lookup the namespace name. 5794 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5795 LookupParsedName(R, S, &SS); 5796 5797 // Check if we have a previous declaration with the same name. 5798 NamedDecl *PrevDecl 5799 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5800 ForRedeclaration); 5801 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5802 PrevDecl = 0; 5803 5804 if (PrevDecl) { 5805 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5806 // We already have an alias with the same name that points to the same 5807 // namespace, so don't create a new one. 5808 // FIXME: At some point, we'll want to create the (redundant) 5809 // declaration to maintain better source information. 5810 if (!R.isAmbiguous() && !R.empty() && 5811 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5812 return 0; 5813 } 5814 5815 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5816 diag::err_redefinition_different_kind; 5817 Diag(AliasLoc, DiagID) << Alias; 5818 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5819 return 0; 5820 } 5821 5822 if (R.isAmbiguous()) 5823 return 0; 5824 5825 if (R.empty()) { 5826 if (DeclarationName Corrected = CorrectTypo(R, S, &SS, 0, false, 5827 CTC_NoKeywords, 0)) { 5828 if (R.getAsSingle<NamespaceDecl>() || 5829 R.getAsSingle<NamespaceAliasDecl>()) { 5830 if (DeclContext *DC = computeDeclContext(SS, false)) 5831 Diag(IdentLoc, diag::err_using_directive_member_suggest) 5832 << Ident << DC << Corrected << SS.getRange() 5833 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5834 else 5835 Diag(IdentLoc, diag::err_using_directive_suggest) 5836 << Ident << Corrected 5837 << FixItHint::CreateReplacement(IdentLoc, Corrected.getAsString()); 5838 5839 Diag(R.getFoundDecl()->getLocation(), diag::note_namespace_defined_here) 5840 << Corrected; 5841 5842 Ident = Corrected.getAsIdentifierInfo(); 5843 } else { 5844 R.clear(); 5845 R.setLookupName(Ident); 5846 } 5847 } 5848 5849 if (R.empty()) { 5850 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5851 return 0; 5852 } 5853 } 5854 5855 NamespaceAliasDecl *AliasDecl = 5856 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5857 Alias, SS.getWithLocInContext(Context), 5858 IdentLoc, R.getFoundDecl()); 5859 5860 PushOnScopeChains(AliasDecl, S); 5861 return AliasDecl; 5862} 5863 5864namespace { 5865 /// \brief Scoped object used to handle the state changes required in Sema 5866 /// to implicitly define the body of a C++ member function; 5867 class ImplicitlyDefinedFunctionScope { 5868 Sema &S; 5869 Sema::ContextRAII SavedContext; 5870 5871 public: 5872 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5873 : S(S), SavedContext(S, Method) 5874 { 5875 S.PushFunctionScope(); 5876 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5877 } 5878 5879 ~ImplicitlyDefinedFunctionScope() { 5880 S.PopExpressionEvaluationContext(); 5881 S.PopFunctionOrBlockScope(); 5882 } 5883 }; 5884} 5885 5886Sema::ImplicitExceptionSpecification 5887Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5888 // C++ [except.spec]p14: 5889 // An implicitly declared special member function (Clause 12) shall have an 5890 // exception-specification. [...] 5891 ImplicitExceptionSpecification ExceptSpec(Context); 5892 5893 // Direct base-class constructors. 5894 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5895 BEnd = ClassDecl->bases_end(); 5896 B != BEnd; ++B) { 5897 if (B->isVirtual()) // Handled below. 5898 continue; 5899 5900 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5901 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5902 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5903 // If this is a deleted function, add it anyway. This might be conformant 5904 // with the standard. This might not. I'm not sure. It might not matter. 5905 if (Constructor) 5906 ExceptSpec.CalledDecl(Constructor); 5907 } 5908 } 5909 5910 // Virtual base-class constructors. 5911 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5912 BEnd = ClassDecl->vbases_end(); 5913 B != BEnd; ++B) { 5914 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5915 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5916 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5917 // If this is a deleted function, add it anyway. This might be conformant 5918 // with the standard. This might not. I'm not sure. It might not matter. 5919 if (Constructor) 5920 ExceptSpec.CalledDecl(Constructor); 5921 } 5922 } 5923 5924 // Field constructors. 5925 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5926 FEnd = ClassDecl->field_end(); 5927 F != FEnd; ++F) { 5928 if (F->hasInClassInitializer()) { 5929 if (Expr *E = F->getInClassInitializer()) 5930 ExceptSpec.CalledExpr(E); 5931 else if (!F->isInvalidDecl()) 5932 ExceptSpec.SetDelayed(); 5933 } else if (const RecordType *RecordTy 5934 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5935 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5936 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 5937 // If this is a deleted function, add it anyway. This might be conformant 5938 // with the standard. This might not. I'm not sure. It might not matter. 5939 // In particular, the problem is that this function never gets called. It 5940 // might just be ill-formed because this function attempts to refer to 5941 // a deleted function here. 5942 if (Constructor) 5943 ExceptSpec.CalledDecl(Constructor); 5944 } 5945 } 5946 5947 return ExceptSpec; 5948} 5949 5950CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5951 CXXRecordDecl *ClassDecl) { 5952 // C++ [class.ctor]p5: 5953 // A default constructor for a class X is a constructor of class X 5954 // that can be called without an argument. If there is no 5955 // user-declared constructor for class X, a default constructor is 5956 // implicitly declared. An implicitly-declared default constructor 5957 // is an inline public member of its class. 5958 assert(!ClassDecl->hasUserDeclaredConstructor() && 5959 "Should not build implicit default constructor!"); 5960 5961 ImplicitExceptionSpecification Spec = 5962 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5963 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5964 5965 // Create the actual constructor declaration. 5966 CanQualType ClassType 5967 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5968 SourceLocation ClassLoc = ClassDecl->getLocation(); 5969 DeclarationName Name 5970 = Context.DeclarationNames.getCXXConstructorName(ClassType); 5971 DeclarationNameInfo NameInfo(Name, ClassLoc); 5972 CXXConstructorDecl *DefaultCon 5973 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 5974 Context.getFunctionType(Context.VoidTy, 5975 0, 0, EPI), 5976 /*TInfo=*/0, 5977 /*isExplicit=*/false, 5978 /*isInline=*/true, 5979 /*isImplicitlyDeclared=*/true); 5980 DefaultCon->setAccess(AS_public); 5981 DefaultCon->setDefaulted(); 5982 DefaultCon->setImplicit(); 5983 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 5984 5985 // Note that we have declared this constructor. 5986 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 5987 5988 if (Scope *S = getScopeForContext(ClassDecl)) 5989 PushOnScopeChains(DefaultCon, S, false); 5990 ClassDecl->addDecl(DefaultCon); 5991 5992 if (ShouldDeleteDefaultConstructor(DefaultCon)) 5993 DefaultCon->setDeletedAsWritten(); 5994 5995 return DefaultCon; 5996} 5997 5998void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 5999 CXXConstructorDecl *Constructor) { 6000 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6001 !Constructor->doesThisDeclarationHaveABody() && 6002 !Constructor->isDeleted()) && 6003 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6004 6005 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6006 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6007 6008 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6009 DiagnosticErrorTrap Trap(Diags); 6010 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6011 Trap.hasErrorOccurred()) { 6012 Diag(CurrentLocation, diag::note_member_synthesized_at) 6013 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6014 Constructor->setInvalidDecl(); 6015 return; 6016 } 6017 6018 SourceLocation Loc = Constructor->getLocation(); 6019 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6020 6021 Constructor->setUsed(); 6022 MarkVTableUsed(CurrentLocation, ClassDecl); 6023 6024 if (ASTMutationListener *L = getASTMutationListener()) { 6025 L->CompletedImplicitDefinition(Constructor); 6026 } 6027} 6028 6029/// Get any existing defaulted default constructor for the given class. Do not 6030/// implicitly define one if it does not exist. 6031static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6032 CXXRecordDecl *D) { 6033 ASTContext &Context = Self.Context; 6034 QualType ClassType = Context.getTypeDeclType(D); 6035 DeclarationName ConstructorName 6036 = Context.DeclarationNames.getCXXConstructorName( 6037 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6038 6039 DeclContext::lookup_const_iterator Con, ConEnd; 6040 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6041 Con != ConEnd; ++Con) { 6042 // A function template cannot be defaulted. 6043 if (isa<FunctionTemplateDecl>(*Con)) 6044 continue; 6045 6046 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6047 if (Constructor->isDefaultConstructor()) 6048 return Constructor->isDefaulted() ? Constructor : 0; 6049 } 6050 return 0; 6051} 6052 6053void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6054 if (!D) return; 6055 AdjustDeclIfTemplate(D); 6056 6057 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6058 CXXConstructorDecl *CtorDecl 6059 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6060 6061 if (!CtorDecl) return; 6062 6063 // Compute the exception specification for the default constructor. 6064 const FunctionProtoType *CtorTy = 6065 CtorDecl->getType()->castAs<FunctionProtoType>(); 6066 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6067 ImplicitExceptionSpecification Spec = 6068 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6069 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6070 assert(EPI.ExceptionSpecType != EST_Delayed); 6071 6072 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6073 } 6074 6075 // If the default constructor is explicitly defaulted, checking the exception 6076 // specification is deferred until now. 6077 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6078 !ClassDecl->isDependentType()) 6079 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6080} 6081 6082void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6083 // We start with an initial pass over the base classes to collect those that 6084 // inherit constructors from. If there are none, we can forgo all further 6085 // processing. 6086 typedef llvm::SmallVector<const RecordType *, 4> BasesVector; 6087 BasesVector BasesToInheritFrom; 6088 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6089 BaseE = ClassDecl->bases_end(); 6090 BaseIt != BaseE; ++BaseIt) { 6091 if (BaseIt->getInheritConstructors()) { 6092 QualType Base = BaseIt->getType(); 6093 if (Base->isDependentType()) { 6094 // If we inherit constructors from anything that is dependent, just 6095 // abort processing altogether. We'll get another chance for the 6096 // instantiations. 6097 return; 6098 } 6099 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6100 } 6101 } 6102 if (BasesToInheritFrom.empty()) 6103 return; 6104 6105 // Now collect the constructors that we already have in the current class. 6106 // Those take precedence over inherited constructors. 6107 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6108 // unless there is a user-declared constructor with the same signature in 6109 // the class where the using-declaration appears. 6110 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6111 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6112 CtorE = ClassDecl->ctor_end(); 6113 CtorIt != CtorE; ++CtorIt) { 6114 ExistingConstructors.insert( 6115 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6116 } 6117 6118 Scope *S = getScopeForContext(ClassDecl); 6119 DeclarationName CreatedCtorName = 6120 Context.DeclarationNames.getCXXConstructorName( 6121 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6122 6123 // Now comes the true work. 6124 // First, we keep a map from constructor types to the base that introduced 6125 // them. Needed for finding conflicting constructors. We also keep the 6126 // actually inserted declarations in there, for pretty diagnostics. 6127 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6128 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6129 ConstructorToSourceMap InheritedConstructors; 6130 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6131 BaseE = BasesToInheritFrom.end(); 6132 BaseIt != BaseE; ++BaseIt) { 6133 const RecordType *Base = *BaseIt; 6134 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6135 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6136 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6137 CtorE = BaseDecl->ctor_end(); 6138 CtorIt != CtorE; ++CtorIt) { 6139 // Find the using declaration for inheriting this base's constructors. 6140 DeclarationName Name = 6141 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6142 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6143 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6144 SourceLocation UsingLoc = UD ? UD->getLocation() : 6145 ClassDecl->getLocation(); 6146 6147 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6148 // from the class X named in the using-declaration consists of actual 6149 // constructors and notional constructors that result from the 6150 // transformation of defaulted parameters as follows: 6151 // - all non-template default constructors of X, and 6152 // - for each non-template constructor of X that has at least one 6153 // parameter with a default argument, the set of constructors that 6154 // results from omitting any ellipsis parameter specification and 6155 // successively omitting parameters with a default argument from the 6156 // end of the parameter-type-list. 6157 CXXConstructorDecl *BaseCtor = *CtorIt; 6158 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6159 const FunctionProtoType *BaseCtorType = 6160 BaseCtor->getType()->getAs<FunctionProtoType>(); 6161 6162 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6163 maxParams = BaseCtor->getNumParams(); 6164 params <= maxParams; ++params) { 6165 // Skip default constructors. They're never inherited. 6166 if (params == 0) 6167 continue; 6168 // Skip copy and move constructors for the same reason. 6169 if (CanBeCopyOrMove && params == 1) 6170 continue; 6171 6172 // Build up a function type for this particular constructor. 6173 // FIXME: The working paper does not consider that the exception spec 6174 // for the inheriting constructor might be larger than that of the 6175 // source. This code doesn't yet, either. When it does, this code will 6176 // need to be delayed until after exception specifications and in-class 6177 // member initializers are attached. 6178 const Type *NewCtorType; 6179 if (params == maxParams) 6180 NewCtorType = BaseCtorType; 6181 else { 6182 llvm::SmallVector<QualType, 16> Args; 6183 for (unsigned i = 0; i < params; ++i) { 6184 Args.push_back(BaseCtorType->getArgType(i)); 6185 } 6186 FunctionProtoType::ExtProtoInfo ExtInfo = 6187 BaseCtorType->getExtProtoInfo(); 6188 ExtInfo.Variadic = false; 6189 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6190 Args.data(), params, ExtInfo) 6191 .getTypePtr(); 6192 } 6193 const Type *CanonicalNewCtorType = 6194 Context.getCanonicalType(NewCtorType); 6195 6196 // Now that we have the type, first check if the class already has a 6197 // constructor with this signature. 6198 if (ExistingConstructors.count(CanonicalNewCtorType)) 6199 continue; 6200 6201 // Then we check if we have already declared an inherited constructor 6202 // with this signature. 6203 std::pair<ConstructorToSourceMap::iterator, bool> result = 6204 InheritedConstructors.insert(std::make_pair( 6205 CanonicalNewCtorType, 6206 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6207 if (!result.second) { 6208 // Already in the map. If it came from a different class, that's an 6209 // error. Not if it's from the same. 6210 CanQualType PreviousBase = result.first->second.first; 6211 if (CanonicalBase != PreviousBase) { 6212 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6213 const CXXConstructorDecl *PrevBaseCtor = 6214 PrevCtor->getInheritedConstructor(); 6215 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6216 6217 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6218 Diag(BaseCtor->getLocation(), 6219 diag::note_using_decl_constructor_conflict_current_ctor); 6220 Diag(PrevBaseCtor->getLocation(), 6221 diag::note_using_decl_constructor_conflict_previous_ctor); 6222 Diag(PrevCtor->getLocation(), 6223 diag::note_using_decl_constructor_conflict_previous_using); 6224 } 6225 continue; 6226 } 6227 6228 // OK, we're there, now add the constructor. 6229 // C++0x [class.inhctor]p8: [...] that would be performed by a 6230 // user-writtern inline constructor [...] 6231 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6232 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6233 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6234 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6235 /*ImplicitlyDeclared=*/true); 6236 NewCtor->setAccess(BaseCtor->getAccess()); 6237 6238 // Build up the parameter decls and add them. 6239 llvm::SmallVector<ParmVarDecl *, 16> ParamDecls; 6240 for (unsigned i = 0; i < params; ++i) { 6241 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6242 UsingLoc, UsingLoc, 6243 /*IdentifierInfo=*/0, 6244 BaseCtorType->getArgType(i), 6245 /*TInfo=*/0, SC_None, 6246 SC_None, /*DefaultArg=*/0)); 6247 } 6248 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6249 NewCtor->setInheritedConstructor(BaseCtor); 6250 6251 PushOnScopeChains(NewCtor, S, false); 6252 ClassDecl->addDecl(NewCtor); 6253 result.first->second.second = NewCtor; 6254 } 6255 } 6256 } 6257} 6258 6259Sema::ImplicitExceptionSpecification 6260Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6261 // C++ [except.spec]p14: 6262 // An implicitly declared special member function (Clause 12) shall have 6263 // an exception-specification. 6264 ImplicitExceptionSpecification ExceptSpec(Context); 6265 6266 // Direct base-class destructors. 6267 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6268 BEnd = ClassDecl->bases_end(); 6269 B != BEnd; ++B) { 6270 if (B->isVirtual()) // Handled below. 6271 continue; 6272 6273 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6274 ExceptSpec.CalledDecl( 6275 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6276 } 6277 6278 // Virtual base-class destructors. 6279 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6280 BEnd = ClassDecl->vbases_end(); 6281 B != BEnd; ++B) { 6282 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6283 ExceptSpec.CalledDecl( 6284 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6285 } 6286 6287 // Field destructors. 6288 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6289 FEnd = ClassDecl->field_end(); 6290 F != FEnd; ++F) { 6291 if (const RecordType *RecordTy 6292 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6293 ExceptSpec.CalledDecl( 6294 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6295 } 6296 6297 return ExceptSpec; 6298} 6299 6300CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6301 // C++ [class.dtor]p2: 6302 // If a class has no user-declared destructor, a destructor is 6303 // declared implicitly. An implicitly-declared destructor is an 6304 // inline public member of its class. 6305 6306 ImplicitExceptionSpecification Spec = 6307 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6308 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6309 6310 // Create the actual destructor declaration. 6311 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6312 6313 CanQualType ClassType 6314 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6315 SourceLocation ClassLoc = ClassDecl->getLocation(); 6316 DeclarationName Name 6317 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6318 DeclarationNameInfo NameInfo(Name, ClassLoc); 6319 CXXDestructorDecl *Destructor 6320 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6321 /*isInline=*/true, 6322 /*isImplicitlyDeclared=*/true); 6323 Destructor->setAccess(AS_public); 6324 Destructor->setDefaulted(); 6325 Destructor->setImplicit(); 6326 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6327 6328 // Note that we have declared this destructor. 6329 ++ASTContext::NumImplicitDestructorsDeclared; 6330 6331 // Introduce this destructor into its scope. 6332 if (Scope *S = getScopeForContext(ClassDecl)) 6333 PushOnScopeChains(Destructor, S, false); 6334 ClassDecl->addDecl(Destructor); 6335 6336 // This could be uniqued if it ever proves significant. 6337 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6338 6339 if (ShouldDeleteDestructor(Destructor)) 6340 Destructor->setDeletedAsWritten(); 6341 6342 AddOverriddenMethods(ClassDecl, Destructor); 6343 6344 return Destructor; 6345} 6346 6347void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6348 CXXDestructorDecl *Destructor) { 6349 assert((Destructor->isDefaulted() && 6350 !Destructor->doesThisDeclarationHaveABody()) && 6351 "DefineImplicitDestructor - call it for implicit default dtor"); 6352 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6353 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6354 6355 if (Destructor->isInvalidDecl()) 6356 return; 6357 6358 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6359 6360 DiagnosticErrorTrap Trap(Diags); 6361 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6362 Destructor->getParent()); 6363 6364 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6365 Diag(CurrentLocation, diag::note_member_synthesized_at) 6366 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6367 6368 Destructor->setInvalidDecl(); 6369 return; 6370 } 6371 6372 SourceLocation Loc = Destructor->getLocation(); 6373 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6374 6375 Destructor->setUsed(); 6376 MarkVTableUsed(CurrentLocation, ClassDecl); 6377 6378 if (ASTMutationListener *L = getASTMutationListener()) { 6379 L->CompletedImplicitDefinition(Destructor); 6380 } 6381} 6382 6383void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6384 CXXDestructorDecl *destructor) { 6385 // C++11 [class.dtor]p3: 6386 // A declaration of a destructor that does not have an exception- 6387 // specification is implicitly considered to have the same exception- 6388 // specification as an implicit declaration. 6389 const FunctionProtoType *dtorType = destructor->getType()-> 6390 getAs<FunctionProtoType>(); 6391 if (dtorType->hasExceptionSpec()) 6392 return; 6393 6394 ImplicitExceptionSpecification exceptSpec = 6395 ComputeDefaultedDtorExceptionSpec(classDecl); 6396 6397 // Replace the destructor's type. 6398 FunctionProtoType::ExtProtoInfo epi; 6399 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6400 epi.NumExceptions = exceptSpec.size(); 6401 epi.Exceptions = exceptSpec.data(); 6402 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6403 6404 destructor->setType(ty); 6405 6406 // FIXME: If the destructor has a body that could throw, and the newly created 6407 // spec doesn't allow exceptions, we should emit a warning, because this 6408 // change in behavior can break conforming C++03 programs at runtime. 6409 // However, we don't have a body yet, so it needs to be done somewhere else. 6410} 6411 6412/// \brief Builds a statement that copies the given entity from \p From to 6413/// \c To. 6414/// 6415/// This routine is used to copy the members of a class with an 6416/// implicitly-declared copy assignment operator. When the entities being 6417/// copied are arrays, this routine builds for loops to copy them. 6418/// 6419/// \param S The Sema object used for type-checking. 6420/// 6421/// \param Loc The location where the implicit copy is being generated. 6422/// 6423/// \param T The type of the expressions being copied. Both expressions must 6424/// have this type. 6425/// 6426/// \param To The expression we are copying to. 6427/// 6428/// \param From The expression we are copying from. 6429/// 6430/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6431/// Otherwise, it's a non-static member subobject. 6432/// 6433/// \param Depth Internal parameter recording the depth of the recursion. 6434/// 6435/// \returns A statement or a loop that copies the expressions. 6436static StmtResult 6437BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6438 Expr *To, Expr *From, 6439 bool CopyingBaseSubobject, unsigned Depth = 0) { 6440 // C++0x [class.copy]p30: 6441 // Each subobject is assigned in the manner appropriate to its type: 6442 // 6443 // - if the subobject is of class type, the copy assignment operator 6444 // for the class is used (as if by explicit qualification; that is, 6445 // ignoring any possible virtual overriding functions in more derived 6446 // classes); 6447 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6448 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6449 6450 // Look for operator=. 6451 DeclarationName Name 6452 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6453 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6454 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6455 6456 // Filter out any result that isn't a copy-assignment operator. 6457 LookupResult::Filter F = OpLookup.makeFilter(); 6458 while (F.hasNext()) { 6459 NamedDecl *D = F.next(); 6460 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6461 if (Method->isCopyAssignmentOperator()) 6462 continue; 6463 6464 F.erase(); 6465 } 6466 F.done(); 6467 6468 // Suppress the protected check (C++ [class.protected]) for each of the 6469 // assignment operators we found. This strange dance is required when 6470 // we're assigning via a base classes's copy-assignment operator. To 6471 // ensure that we're getting the right base class subobject (without 6472 // ambiguities), we need to cast "this" to that subobject type; to 6473 // ensure that we don't go through the virtual call mechanism, we need 6474 // to qualify the operator= name with the base class (see below). However, 6475 // this means that if the base class has a protected copy assignment 6476 // operator, the protected member access check will fail. So, we 6477 // rewrite "protected" access to "public" access in this case, since we 6478 // know by construction that we're calling from a derived class. 6479 if (CopyingBaseSubobject) { 6480 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6481 L != LEnd; ++L) { 6482 if (L.getAccess() == AS_protected) 6483 L.setAccess(AS_public); 6484 } 6485 } 6486 6487 // Create the nested-name-specifier that will be used to qualify the 6488 // reference to operator=; this is required to suppress the virtual 6489 // call mechanism. 6490 CXXScopeSpec SS; 6491 SS.MakeTrivial(S.Context, 6492 NestedNameSpecifier::Create(S.Context, 0, false, 6493 T.getTypePtr()), 6494 Loc); 6495 6496 // Create the reference to operator=. 6497 ExprResult OpEqualRef 6498 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6499 /*FirstQualifierInScope=*/0, OpLookup, 6500 /*TemplateArgs=*/0, 6501 /*SuppressQualifierCheck=*/true); 6502 if (OpEqualRef.isInvalid()) 6503 return StmtError(); 6504 6505 // Build the call to the assignment operator. 6506 6507 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6508 OpEqualRef.takeAs<Expr>(), 6509 Loc, &From, 1, Loc); 6510 if (Call.isInvalid()) 6511 return StmtError(); 6512 6513 return S.Owned(Call.takeAs<Stmt>()); 6514 } 6515 6516 // - if the subobject is of scalar type, the built-in assignment 6517 // operator is used. 6518 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6519 if (!ArrayTy) { 6520 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6521 if (Assignment.isInvalid()) 6522 return StmtError(); 6523 6524 return S.Owned(Assignment.takeAs<Stmt>()); 6525 } 6526 6527 // - if the subobject is an array, each element is assigned, in the 6528 // manner appropriate to the element type; 6529 6530 // Construct a loop over the array bounds, e.g., 6531 // 6532 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6533 // 6534 // that will copy each of the array elements. 6535 QualType SizeType = S.Context.getSizeType(); 6536 6537 // Create the iteration variable. 6538 IdentifierInfo *IterationVarName = 0; 6539 { 6540 llvm::SmallString<8> Str; 6541 llvm::raw_svector_ostream OS(Str); 6542 OS << "__i" << Depth; 6543 IterationVarName = &S.Context.Idents.get(OS.str()); 6544 } 6545 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6546 IterationVarName, SizeType, 6547 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6548 SC_None, SC_None); 6549 6550 // Initialize the iteration variable to zero. 6551 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6552 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6553 6554 // Create a reference to the iteration variable; we'll use this several 6555 // times throughout. 6556 Expr *IterationVarRef 6557 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6558 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6559 6560 // Create the DeclStmt that holds the iteration variable. 6561 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6562 6563 // Create the comparison against the array bound. 6564 llvm::APInt Upper 6565 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6566 Expr *Comparison 6567 = new (S.Context) BinaryOperator(IterationVarRef, 6568 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6569 BO_NE, S.Context.BoolTy, 6570 VK_RValue, OK_Ordinary, Loc); 6571 6572 // Create the pre-increment of the iteration variable. 6573 Expr *Increment 6574 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6575 VK_LValue, OK_Ordinary, Loc); 6576 6577 // Subscript the "from" and "to" expressions with the iteration variable. 6578 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6579 IterationVarRef, Loc)); 6580 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6581 IterationVarRef, Loc)); 6582 6583 // Build the copy for an individual element of the array. 6584 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6585 To, From, CopyingBaseSubobject, 6586 Depth + 1); 6587 if (Copy.isInvalid()) 6588 return StmtError(); 6589 6590 // Construct the loop that copies all elements of this array. 6591 return S.ActOnForStmt(Loc, Loc, InitStmt, 6592 S.MakeFullExpr(Comparison), 6593 0, S.MakeFullExpr(Increment), 6594 Loc, Copy.take()); 6595} 6596 6597std::pair<Sema::ImplicitExceptionSpecification, bool> 6598Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6599 CXXRecordDecl *ClassDecl) { 6600 // C++ [class.copy]p10: 6601 // If the class definition does not explicitly declare a copy 6602 // assignment operator, one is declared implicitly. 6603 // The implicitly-defined copy assignment operator for a class X 6604 // will have the form 6605 // 6606 // X& X::operator=(const X&) 6607 // 6608 // if 6609 bool HasConstCopyAssignment = true; 6610 6611 // -- each direct base class B of X has a copy assignment operator 6612 // whose parameter is of type const B&, const volatile B& or B, 6613 // and 6614 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6615 BaseEnd = ClassDecl->bases_end(); 6616 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6617 // We'll handle this below 6618 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 6619 continue; 6620 6621 assert(!Base->getType()->isDependentType() && 6622 "Cannot generate implicit members for class with dependent bases."); 6623 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 6624 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 6625 &HasConstCopyAssignment); 6626 } 6627 6628 // In C++0x, the above citation has "or virtual added" 6629 if (LangOpts.CPlusPlus0x) { 6630 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6631 BaseEnd = ClassDecl->vbases_end(); 6632 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6633 assert(!Base->getType()->isDependentType() && 6634 "Cannot generate implicit members for class with dependent bases."); 6635 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 6636 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 6637 &HasConstCopyAssignment); 6638 } 6639 } 6640 6641 // -- for all the nonstatic data members of X that are of a class 6642 // type M (or array thereof), each such class type has a copy 6643 // assignment operator whose parameter is of type const M&, 6644 // const volatile M& or M. 6645 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6646 FieldEnd = ClassDecl->field_end(); 6647 HasConstCopyAssignment && Field != FieldEnd; 6648 ++Field) { 6649 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6650 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 6651 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 6652 &HasConstCopyAssignment); 6653 } 6654 } 6655 6656 // Otherwise, the implicitly declared copy assignment operator will 6657 // have the form 6658 // 6659 // X& X::operator=(X&) 6660 6661 // C++ [except.spec]p14: 6662 // An implicitly declared special member function (Clause 12) shall have an 6663 // exception-specification. [...] 6664 6665 // It is unspecified whether or not an implicit copy assignment operator 6666 // attempts to deduplicate calls to assignment operators of virtual bases are 6667 // made. As such, this exception specification is effectively unspecified. 6668 // Based on a similar decision made for constness in C++0x, we're erring on 6669 // the side of assuming such calls to be made regardless of whether they 6670 // actually happen. 6671 ImplicitExceptionSpecification ExceptSpec(Context); 6672 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 6673 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6674 BaseEnd = ClassDecl->bases_end(); 6675 Base != BaseEnd; ++Base) { 6676 if (Base->isVirtual()) 6677 continue; 6678 6679 CXXRecordDecl *BaseClassDecl 6680 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6681 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 6682 ArgQuals, false, 0)) 6683 ExceptSpec.CalledDecl(CopyAssign); 6684 } 6685 6686 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6687 BaseEnd = ClassDecl->vbases_end(); 6688 Base != BaseEnd; ++Base) { 6689 CXXRecordDecl *BaseClassDecl 6690 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6691 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 6692 ArgQuals, false, 0)) 6693 ExceptSpec.CalledDecl(CopyAssign); 6694 } 6695 6696 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6697 FieldEnd = ClassDecl->field_end(); 6698 Field != FieldEnd; 6699 ++Field) { 6700 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6701 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 6702 if (CXXMethodDecl *CopyAssign = 6703 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 6704 ExceptSpec.CalledDecl(CopyAssign); 6705 } 6706 } 6707 6708 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6709} 6710 6711CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6712 // Note: The following rules are largely analoguous to the copy 6713 // constructor rules. Note that virtual bases are not taken into account 6714 // for determining the argument type of the operator. Note also that 6715 // operators taking an object instead of a reference are allowed. 6716 6717 ImplicitExceptionSpecification Spec(Context); 6718 bool Const; 6719 llvm::tie(Spec, Const) = 6720 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6721 6722 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6723 QualType RetType = Context.getLValueReferenceType(ArgType); 6724 if (Const) 6725 ArgType = ArgType.withConst(); 6726 ArgType = Context.getLValueReferenceType(ArgType); 6727 6728 // An implicitly-declared copy assignment operator is an inline public 6729 // member of its class. 6730 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6731 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6732 SourceLocation ClassLoc = ClassDecl->getLocation(); 6733 DeclarationNameInfo NameInfo(Name, ClassLoc); 6734 CXXMethodDecl *CopyAssignment 6735 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6736 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6737 /*TInfo=*/0, /*isStatic=*/false, 6738 /*StorageClassAsWritten=*/SC_None, 6739 /*isInline=*/true, 6740 SourceLocation()); 6741 CopyAssignment->setAccess(AS_public); 6742 CopyAssignment->setDefaulted(); 6743 CopyAssignment->setImplicit(); 6744 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6745 6746 // Add the parameter to the operator. 6747 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6748 ClassLoc, ClassLoc, /*Id=*/0, 6749 ArgType, /*TInfo=*/0, 6750 SC_None, 6751 SC_None, 0); 6752 CopyAssignment->setParams(&FromParam, 1); 6753 6754 // Note that we have added this copy-assignment operator. 6755 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6756 6757 if (Scope *S = getScopeForContext(ClassDecl)) 6758 PushOnScopeChains(CopyAssignment, S, false); 6759 ClassDecl->addDecl(CopyAssignment); 6760 6761 // C++0x [class.copy]p18: 6762 // ... If the class definition declares a move constructor or move 6763 // assignment operator, the implicitly declared copy assignment operator is 6764 // defined as deleted; ... 6765 if (ClassDecl->hasUserDeclaredMoveConstructor() || 6766 ClassDecl->hasUserDeclaredMoveAssignment() || 6767 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6768 CopyAssignment->setDeletedAsWritten(); 6769 6770 AddOverriddenMethods(ClassDecl, CopyAssignment); 6771 return CopyAssignment; 6772} 6773 6774void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6775 CXXMethodDecl *CopyAssignOperator) { 6776 assert((CopyAssignOperator->isDefaulted() && 6777 CopyAssignOperator->isOverloadedOperator() && 6778 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6779 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 6780 "DefineImplicitCopyAssignment called for wrong function"); 6781 6782 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6783 6784 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6785 CopyAssignOperator->setInvalidDecl(); 6786 return; 6787 } 6788 6789 CopyAssignOperator->setUsed(); 6790 6791 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6792 DiagnosticErrorTrap Trap(Diags); 6793 6794 // C++0x [class.copy]p30: 6795 // The implicitly-defined or explicitly-defaulted copy assignment operator 6796 // for a non-union class X performs memberwise copy assignment of its 6797 // subobjects. The direct base classes of X are assigned first, in the 6798 // order of their declaration in the base-specifier-list, and then the 6799 // immediate non-static data members of X are assigned, in the order in 6800 // which they were declared in the class definition. 6801 6802 // The statements that form the synthesized function body. 6803 ASTOwningVector<Stmt*> Statements(*this); 6804 6805 // The parameter for the "other" object, which we are copying from. 6806 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6807 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6808 QualType OtherRefType = Other->getType(); 6809 if (const LValueReferenceType *OtherRef 6810 = OtherRefType->getAs<LValueReferenceType>()) { 6811 OtherRefType = OtherRef->getPointeeType(); 6812 OtherQuals = OtherRefType.getQualifiers(); 6813 } 6814 6815 // Our location for everything implicitly-generated. 6816 SourceLocation Loc = CopyAssignOperator->getLocation(); 6817 6818 // Construct a reference to the "other" object. We'll be using this 6819 // throughout the generated ASTs. 6820 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6821 assert(OtherRef && "Reference to parameter cannot fail!"); 6822 6823 // Construct the "this" pointer. We'll be using this throughout the generated 6824 // ASTs. 6825 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6826 assert(This && "Reference to this cannot fail!"); 6827 6828 // Assign base classes. 6829 bool Invalid = false; 6830 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6831 E = ClassDecl->bases_end(); Base != E; ++Base) { 6832 // Form the assignment: 6833 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6834 QualType BaseType = Base->getType().getUnqualifiedType(); 6835 if (!BaseType->isRecordType()) { 6836 Invalid = true; 6837 continue; 6838 } 6839 6840 CXXCastPath BasePath; 6841 BasePath.push_back(Base); 6842 6843 // Construct the "from" expression, which is an implicit cast to the 6844 // appropriately-qualified base type. 6845 Expr *From = OtherRef; 6846 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6847 CK_UncheckedDerivedToBase, 6848 VK_LValue, &BasePath).take(); 6849 6850 // Dereference "this". 6851 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6852 6853 // Implicitly cast "this" to the appropriately-qualified base type. 6854 To = ImpCastExprToType(To.take(), 6855 Context.getCVRQualifiedType(BaseType, 6856 CopyAssignOperator->getTypeQualifiers()), 6857 CK_UncheckedDerivedToBase, 6858 VK_LValue, &BasePath); 6859 6860 // Build the copy. 6861 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6862 To.get(), From, 6863 /*CopyingBaseSubobject=*/true); 6864 if (Copy.isInvalid()) { 6865 Diag(CurrentLocation, diag::note_member_synthesized_at) 6866 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6867 CopyAssignOperator->setInvalidDecl(); 6868 return; 6869 } 6870 6871 // Success! Record the copy. 6872 Statements.push_back(Copy.takeAs<Expr>()); 6873 } 6874 6875 // \brief Reference to the __builtin_memcpy function. 6876 Expr *BuiltinMemCpyRef = 0; 6877 // \brief Reference to the __builtin_objc_memmove_collectable function. 6878 Expr *CollectableMemCpyRef = 0; 6879 6880 // Assign non-static members. 6881 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6882 FieldEnd = ClassDecl->field_end(); 6883 Field != FieldEnd; ++Field) { 6884 // Check for members of reference type; we can't copy those. 6885 if (Field->getType()->isReferenceType()) { 6886 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6887 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6888 Diag(Field->getLocation(), diag::note_declared_at); 6889 Diag(CurrentLocation, diag::note_member_synthesized_at) 6890 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6891 Invalid = true; 6892 continue; 6893 } 6894 6895 // Check for members of const-qualified, non-class type. 6896 QualType BaseType = Context.getBaseElementType(Field->getType()); 6897 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6898 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6899 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6900 Diag(Field->getLocation(), diag::note_declared_at); 6901 Diag(CurrentLocation, diag::note_member_synthesized_at) 6902 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6903 Invalid = true; 6904 continue; 6905 } 6906 6907 // Suppress assigning zero-width bitfields. 6908 if (const Expr *Width = Field->getBitWidth()) 6909 if (Width->EvaluateAsInt(Context) == 0) 6910 continue; 6911 6912 QualType FieldType = Field->getType().getNonReferenceType(); 6913 if (FieldType->isIncompleteArrayType()) { 6914 assert(ClassDecl->hasFlexibleArrayMember() && 6915 "Incomplete array type is not valid"); 6916 continue; 6917 } 6918 6919 // Build references to the field in the object we're copying from and to. 6920 CXXScopeSpec SS; // Intentionally empty 6921 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6922 LookupMemberName); 6923 MemberLookup.addDecl(*Field); 6924 MemberLookup.resolveKind(); 6925 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6926 Loc, /*IsArrow=*/false, 6927 SS, 0, MemberLookup, 0); 6928 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6929 Loc, /*IsArrow=*/true, 6930 SS, 0, MemberLookup, 0); 6931 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6932 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6933 6934 // If the field should be copied with __builtin_memcpy rather than via 6935 // explicit assignments, do so. This optimization only applies for arrays 6936 // of scalars and arrays of class type with trivial copy-assignment 6937 // operators. 6938 if (FieldType->isArrayType() && 6939 BaseType.hasTrivialCopyAssignment(Context)) { 6940 // Compute the size of the memory buffer to be copied. 6941 QualType SizeType = Context.getSizeType(); 6942 llvm::APInt Size(Context.getTypeSize(SizeType), 6943 Context.getTypeSizeInChars(BaseType).getQuantity()); 6944 for (const ConstantArrayType *Array 6945 = Context.getAsConstantArrayType(FieldType); 6946 Array; 6947 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6948 llvm::APInt ArraySize 6949 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6950 Size *= ArraySize; 6951 } 6952 6953 // Take the address of the field references for "from" and "to". 6954 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6955 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6956 6957 bool NeedsCollectableMemCpy = 6958 (BaseType->isRecordType() && 6959 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 6960 6961 if (NeedsCollectableMemCpy) { 6962 if (!CollectableMemCpyRef) { 6963 // Create a reference to the __builtin_objc_memmove_collectable function. 6964 LookupResult R(*this, 6965 &Context.Idents.get("__builtin_objc_memmove_collectable"), 6966 Loc, LookupOrdinaryName); 6967 LookupName(R, TUScope, true); 6968 6969 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 6970 if (!CollectableMemCpy) { 6971 // Something went horribly wrong earlier, and we will have 6972 // complained about it. 6973 Invalid = true; 6974 continue; 6975 } 6976 6977 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 6978 CollectableMemCpy->getType(), 6979 VK_LValue, Loc, 0).take(); 6980 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 6981 } 6982 } 6983 // Create a reference to the __builtin_memcpy builtin function. 6984 else if (!BuiltinMemCpyRef) { 6985 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 6986 LookupOrdinaryName); 6987 LookupName(R, TUScope, true); 6988 6989 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 6990 if (!BuiltinMemCpy) { 6991 // Something went horribly wrong earlier, and we will have complained 6992 // about it. 6993 Invalid = true; 6994 continue; 6995 } 6996 6997 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 6998 BuiltinMemCpy->getType(), 6999 VK_LValue, Loc, 0).take(); 7000 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7001 } 7002 7003 ASTOwningVector<Expr*> CallArgs(*this); 7004 CallArgs.push_back(To.takeAs<Expr>()); 7005 CallArgs.push_back(From.takeAs<Expr>()); 7006 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7007 ExprResult Call = ExprError(); 7008 if (NeedsCollectableMemCpy) 7009 Call = ActOnCallExpr(/*Scope=*/0, 7010 CollectableMemCpyRef, 7011 Loc, move_arg(CallArgs), 7012 Loc); 7013 else 7014 Call = ActOnCallExpr(/*Scope=*/0, 7015 BuiltinMemCpyRef, 7016 Loc, move_arg(CallArgs), 7017 Loc); 7018 7019 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7020 Statements.push_back(Call.takeAs<Expr>()); 7021 continue; 7022 } 7023 7024 // Build the copy of this field. 7025 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7026 To.get(), From.get(), 7027 /*CopyingBaseSubobject=*/false); 7028 if (Copy.isInvalid()) { 7029 Diag(CurrentLocation, diag::note_member_synthesized_at) 7030 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7031 CopyAssignOperator->setInvalidDecl(); 7032 return; 7033 } 7034 7035 // Success! Record the copy. 7036 Statements.push_back(Copy.takeAs<Stmt>()); 7037 } 7038 7039 if (!Invalid) { 7040 // Add a "return *this;" 7041 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7042 7043 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7044 if (Return.isInvalid()) 7045 Invalid = true; 7046 else { 7047 Statements.push_back(Return.takeAs<Stmt>()); 7048 7049 if (Trap.hasErrorOccurred()) { 7050 Diag(CurrentLocation, diag::note_member_synthesized_at) 7051 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7052 Invalid = true; 7053 } 7054 } 7055 } 7056 7057 if (Invalid) { 7058 CopyAssignOperator->setInvalidDecl(); 7059 return; 7060 } 7061 7062 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7063 /*isStmtExpr=*/false); 7064 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7065 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7066 7067 if (ASTMutationListener *L = getASTMutationListener()) { 7068 L->CompletedImplicitDefinition(CopyAssignOperator); 7069 } 7070} 7071 7072std::pair<Sema::ImplicitExceptionSpecification, bool> 7073Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7074 // C++ [class.copy]p5: 7075 // The implicitly-declared copy constructor for a class X will 7076 // have the form 7077 // 7078 // X::X(const X&) 7079 // 7080 // if 7081 // FIXME: It ought to be possible to store this on the record. 7082 bool HasConstCopyConstructor = true; 7083 7084 // -- each direct or virtual base class B of X has a copy 7085 // constructor whose first parameter is of type const B& or 7086 // const volatile B&, and 7087 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7088 BaseEnd = ClassDecl->bases_end(); 7089 HasConstCopyConstructor && Base != BaseEnd; 7090 ++Base) { 7091 // Virtual bases are handled below. 7092 if (Base->isVirtual()) 7093 continue; 7094 7095 CXXRecordDecl *BaseClassDecl 7096 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7097 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 7098 &HasConstCopyConstructor); 7099 } 7100 7101 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7102 BaseEnd = ClassDecl->vbases_end(); 7103 HasConstCopyConstructor && Base != BaseEnd; 7104 ++Base) { 7105 CXXRecordDecl *BaseClassDecl 7106 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7107 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 7108 &HasConstCopyConstructor); 7109 } 7110 7111 // -- for all the nonstatic data members of X that are of a 7112 // class type M (or array thereof), each such class type 7113 // has a copy constructor whose first parameter is of type 7114 // const M& or const volatile M&. 7115 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7116 FieldEnd = ClassDecl->field_end(); 7117 HasConstCopyConstructor && Field != FieldEnd; 7118 ++Field) { 7119 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7120 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7121 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 7122 &HasConstCopyConstructor); 7123 } 7124 } 7125 // Otherwise, the implicitly declared copy constructor will have 7126 // the form 7127 // 7128 // X::X(X&) 7129 7130 // C++ [except.spec]p14: 7131 // An implicitly declared special member function (Clause 12) shall have an 7132 // exception-specification. [...] 7133 ImplicitExceptionSpecification ExceptSpec(Context); 7134 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7135 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7136 BaseEnd = ClassDecl->bases_end(); 7137 Base != BaseEnd; 7138 ++Base) { 7139 // Virtual bases are handled below. 7140 if (Base->isVirtual()) 7141 continue; 7142 7143 CXXRecordDecl *BaseClassDecl 7144 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7145 if (CXXConstructorDecl *CopyConstructor = 7146 LookupCopyingConstructor(BaseClassDecl, Quals)) 7147 ExceptSpec.CalledDecl(CopyConstructor); 7148 } 7149 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7150 BaseEnd = ClassDecl->vbases_end(); 7151 Base != BaseEnd; 7152 ++Base) { 7153 CXXRecordDecl *BaseClassDecl 7154 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7155 if (CXXConstructorDecl *CopyConstructor = 7156 LookupCopyingConstructor(BaseClassDecl, Quals)) 7157 ExceptSpec.CalledDecl(CopyConstructor); 7158 } 7159 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7160 FieldEnd = ClassDecl->field_end(); 7161 Field != FieldEnd; 7162 ++Field) { 7163 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7164 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7165 if (CXXConstructorDecl *CopyConstructor = 7166 LookupCopyingConstructor(FieldClassDecl, Quals)) 7167 ExceptSpec.CalledDecl(CopyConstructor); 7168 } 7169 } 7170 7171 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7172} 7173 7174CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7175 CXXRecordDecl *ClassDecl) { 7176 // C++ [class.copy]p4: 7177 // If the class definition does not explicitly declare a copy 7178 // constructor, one is declared implicitly. 7179 7180 ImplicitExceptionSpecification Spec(Context); 7181 bool Const; 7182 llvm::tie(Spec, Const) = 7183 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7184 7185 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7186 QualType ArgType = ClassType; 7187 if (Const) 7188 ArgType = ArgType.withConst(); 7189 ArgType = Context.getLValueReferenceType(ArgType); 7190 7191 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7192 7193 DeclarationName Name 7194 = Context.DeclarationNames.getCXXConstructorName( 7195 Context.getCanonicalType(ClassType)); 7196 SourceLocation ClassLoc = ClassDecl->getLocation(); 7197 DeclarationNameInfo NameInfo(Name, ClassLoc); 7198 7199 // An implicitly-declared copy constructor is an inline public 7200 // member of its class. 7201 CXXConstructorDecl *CopyConstructor 7202 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7203 Context.getFunctionType(Context.VoidTy, 7204 &ArgType, 1, EPI), 7205 /*TInfo=*/0, 7206 /*isExplicit=*/false, 7207 /*isInline=*/true, 7208 /*isImplicitlyDeclared=*/true); 7209 CopyConstructor->setAccess(AS_public); 7210 CopyConstructor->setDefaulted(); 7211 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7212 7213 // Note that we have declared this constructor. 7214 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7215 7216 // Add the parameter to the constructor. 7217 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7218 ClassLoc, ClassLoc, 7219 /*IdentifierInfo=*/0, 7220 ArgType, /*TInfo=*/0, 7221 SC_None, 7222 SC_None, 0); 7223 CopyConstructor->setParams(&FromParam, 1); 7224 7225 if (Scope *S = getScopeForContext(ClassDecl)) 7226 PushOnScopeChains(CopyConstructor, S, false); 7227 ClassDecl->addDecl(CopyConstructor); 7228 7229 // C++0x [class.copy]p7: 7230 // ... If the class definition declares a move constructor or move 7231 // assignment operator, the implicitly declared constructor is defined as 7232 // deleted; ... 7233 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7234 ClassDecl->hasUserDeclaredMoveAssignment() || 7235 ShouldDeleteCopyConstructor(CopyConstructor)) 7236 CopyConstructor->setDeletedAsWritten(); 7237 7238 return CopyConstructor; 7239} 7240 7241void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7242 CXXConstructorDecl *CopyConstructor) { 7243 assert((CopyConstructor->isDefaulted() && 7244 CopyConstructor->isCopyConstructor() && 7245 !CopyConstructor->doesThisDeclarationHaveABody()) && 7246 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7247 7248 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7249 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7250 7251 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7252 DiagnosticErrorTrap Trap(Diags); 7253 7254 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7255 Trap.hasErrorOccurred()) { 7256 Diag(CurrentLocation, diag::note_member_synthesized_at) 7257 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7258 CopyConstructor->setInvalidDecl(); 7259 } else { 7260 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7261 CopyConstructor->getLocation(), 7262 MultiStmtArg(*this, 0, 0), 7263 /*isStmtExpr=*/false) 7264 .takeAs<Stmt>()); 7265 } 7266 7267 CopyConstructor->setUsed(); 7268 7269 if (ASTMutationListener *L = getASTMutationListener()) { 7270 L->CompletedImplicitDefinition(CopyConstructor); 7271 } 7272} 7273 7274ExprResult 7275Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7276 CXXConstructorDecl *Constructor, 7277 MultiExprArg ExprArgs, 7278 bool RequiresZeroInit, 7279 unsigned ConstructKind, 7280 SourceRange ParenRange) { 7281 bool Elidable = false; 7282 7283 // C++0x [class.copy]p34: 7284 // When certain criteria are met, an implementation is allowed to 7285 // omit the copy/move construction of a class object, even if the 7286 // copy/move constructor and/or destructor for the object have 7287 // side effects. [...] 7288 // - when a temporary class object that has not been bound to a 7289 // reference (12.2) would be copied/moved to a class object 7290 // with the same cv-unqualified type, the copy/move operation 7291 // can be omitted by constructing the temporary object 7292 // directly into the target of the omitted copy/move 7293 if (ConstructKind == CXXConstructExpr::CK_Complete && 7294 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7295 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7296 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7297 } 7298 7299 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7300 Elidable, move(ExprArgs), RequiresZeroInit, 7301 ConstructKind, ParenRange); 7302} 7303 7304/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7305/// including handling of its default argument expressions. 7306ExprResult 7307Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7308 CXXConstructorDecl *Constructor, bool Elidable, 7309 MultiExprArg ExprArgs, 7310 bool RequiresZeroInit, 7311 unsigned ConstructKind, 7312 SourceRange ParenRange) { 7313 unsigned NumExprs = ExprArgs.size(); 7314 Expr **Exprs = (Expr **)ExprArgs.release(); 7315 7316 for (specific_attr_iterator<NonNullAttr> 7317 i = Constructor->specific_attr_begin<NonNullAttr>(), 7318 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7319 const NonNullAttr *NonNull = *i; 7320 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7321 } 7322 7323 MarkDeclarationReferenced(ConstructLoc, Constructor); 7324 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7325 Constructor, Elidable, Exprs, NumExprs, 7326 RequiresZeroInit, 7327 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7328 ParenRange)); 7329} 7330 7331bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7332 CXXConstructorDecl *Constructor, 7333 MultiExprArg Exprs) { 7334 // FIXME: Provide the correct paren SourceRange when available. 7335 ExprResult TempResult = 7336 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7337 move(Exprs), false, CXXConstructExpr::CK_Complete, 7338 SourceRange()); 7339 if (TempResult.isInvalid()) 7340 return true; 7341 7342 Expr *Temp = TempResult.takeAs<Expr>(); 7343 CheckImplicitConversions(Temp, VD->getLocation()); 7344 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7345 Temp = MaybeCreateExprWithCleanups(Temp); 7346 VD->setInit(Temp); 7347 7348 return false; 7349} 7350 7351void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7352 if (VD->isInvalidDecl()) return; 7353 7354 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7355 if (ClassDecl->isInvalidDecl()) return; 7356 if (ClassDecl->hasTrivialDestructor()) return; 7357 if (ClassDecl->isDependentContext()) return; 7358 7359 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7360 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7361 CheckDestructorAccess(VD->getLocation(), Destructor, 7362 PDiag(diag::err_access_dtor_var) 7363 << VD->getDeclName() 7364 << VD->getType()); 7365 7366 if (!VD->hasGlobalStorage()) return; 7367 7368 // Emit warning for non-trivial dtor in global scope (a real global, 7369 // class-static, function-static). 7370 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7371 7372 // TODO: this should be re-enabled for static locals by !CXAAtExit 7373 if (!VD->isStaticLocal()) 7374 Diag(VD->getLocation(), diag::warn_global_destructor); 7375} 7376 7377/// AddCXXDirectInitializerToDecl - This action is called immediately after 7378/// ActOnDeclarator, when a C++ direct initializer is present. 7379/// e.g: "int x(1);" 7380void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7381 SourceLocation LParenLoc, 7382 MultiExprArg Exprs, 7383 SourceLocation RParenLoc, 7384 bool TypeMayContainAuto) { 7385 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7386 7387 // If there is no declaration, there was an error parsing it. Just ignore 7388 // the initializer. 7389 if (RealDecl == 0) 7390 return; 7391 7392 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7393 if (!VDecl) { 7394 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7395 RealDecl->setInvalidDecl(); 7396 return; 7397 } 7398 7399 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7400 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7401 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7402 if (Exprs.size() > 1) { 7403 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7404 diag::err_auto_var_init_multiple_expressions) 7405 << VDecl->getDeclName() << VDecl->getType() 7406 << VDecl->getSourceRange(); 7407 RealDecl->setInvalidDecl(); 7408 return; 7409 } 7410 7411 Expr *Init = Exprs.get()[0]; 7412 TypeSourceInfo *DeducedType = 0; 7413 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7414 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7415 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7416 << Init->getSourceRange(); 7417 if (!DeducedType) { 7418 RealDecl->setInvalidDecl(); 7419 return; 7420 } 7421 VDecl->setTypeSourceInfo(DeducedType); 7422 VDecl->setType(DeducedType->getType()); 7423 7424 // In ARC, infer lifetime. 7425 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 7426 VDecl->setInvalidDecl(); 7427 7428 // If this is a redeclaration, check that the type we just deduced matches 7429 // the previously declared type. 7430 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7431 MergeVarDeclTypes(VDecl, Old); 7432 } 7433 7434 // We will represent direct-initialization similarly to copy-initialization: 7435 // int x(1); -as-> int x = 1; 7436 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7437 // 7438 // Clients that want to distinguish between the two forms, can check for 7439 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7440 // A major benefit is that clients that don't particularly care about which 7441 // exactly form was it (like the CodeGen) can handle both cases without 7442 // special case code. 7443 7444 // C++ 8.5p11: 7445 // The form of initialization (using parentheses or '=') is generally 7446 // insignificant, but does matter when the entity being initialized has a 7447 // class type. 7448 7449 if (!VDecl->getType()->isDependentType() && 7450 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7451 diag::err_typecheck_decl_incomplete_type)) { 7452 VDecl->setInvalidDecl(); 7453 return; 7454 } 7455 7456 // The variable can not have an abstract class type. 7457 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7458 diag::err_abstract_type_in_decl, 7459 AbstractVariableType)) 7460 VDecl->setInvalidDecl(); 7461 7462 const VarDecl *Def; 7463 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7464 Diag(VDecl->getLocation(), diag::err_redefinition) 7465 << VDecl->getDeclName(); 7466 Diag(Def->getLocation(), diag::note_previous_definition); 7467 VDecl->setInvalidDecl(); 7468 return; 7469 } 7470 7471 // C++ [class.static.data]p4 7472 // If a static data member is of const integral or const 7473 // enumeration type, its declaration in the class definition can 7474 // specify a constant-initializer which shall be an integral 7475 // constant expression (5.19). In that case, the member can appear 7476 // in integral constant expressions. The member shall still be 7477 // defined in a namespace scope if it is used in the program and the 7478 // namespace scope definition shall not contain an initializer. 7479 // 7480 // We already performed a redefinition check above, but for static 7481 // data members we also need to check whether there was an in-class 7482 // declaration with an initializer. 7483 const VarDecl* PrevInit = 0; 7484 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7485 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7486 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7487 return; 7488 } 7489 7490 bool IsDependent = false; 7491 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7492 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7493 VDecl->setInvalidDecl(); 7494 return; 7495 } 7496 7497 if (Exprs.get()[I]->isTypeDependent()) 7498 IsDependent = true; 7499 } 7500 7501 // If either the declaration has a dependent type or if any of the 7502 // expressions is type-dependent, we represent the initialization 7503 // via a ParenListExpr for later use during template instantiation. 7504 if (VDecl->getType()->isDependentType() || IsDependent) { 7505 // Let clients know that initialization was done with a direct initializer. 7506 VDecl->setCXXDirectInitializer(true); 7507 7508 // Store the initialization expressions as a ParenListExpr. 7509 unsigned NumExprs = Exprs.size(); 7510 VDecl->setInit(new (Context) ParenListExpr( 7511 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 7512 VDecl->getType().getNonReferenceType())); 7513 return; 7514 } 7515 7516 // Capture the variable that is being initialized and the style of 7517 // initialization. 7518 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7519 7520 // FIXME: Poor source location information. 7521 InitializationKind Kind 7522 = InitializationKind::CreateDirect(VDecl->getLocation(), 7523 LParenLoc, RParenLoc); 7524 7525 InitializationSequence InitSeq(*this, Entity, Kind, 7526 Exprs.get(), Exprs.size()); 7527 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7528 if (Result.isInvalid()) { 7529 VDecl->setInvalidDecl(); 7530 return; 7531 } 7532 7533 CheckImplicitConversions(Result.get(), LParenLoc); 7534 7535 Result = MaybeCreateExprWithCleanups(Result); 7536 VDecl->setInit(Result.takeAs<Expr>()); 7537 VDecl->setCXXDirectInitializer(true); 7538 7539 CheckCompleteVariableDeclaration(VDecl); 7540} 7541 7542/// \brief Given a constructor and the set of arguments provided for the 7543/// constructor, convert the arguments and add any required default arguments 7544/// to form a proper call to this constructor. 7545/// 7546/// \returns true if an error occurred, false otherwise. 7547bool 7548Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7549 MultiExprArg ArgsPtr, 7550 SourceLocation Loc, 7551 ASTOwningVector<Expr*> &ConvertedArgs) { 7552 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7553 unsigned NumArgs = ArgsPtr.size(); 7554 Expr **Args = (Expr **)ArgsPtr.get(); 7555 7556 const FunctionProtoType *Proto 7557 = Constructor->getType()->getAs<FunctionProtoType>(); 7558 assert(Proto && "Constructor without a prototype?"); 7559 unsigned NumArgsInProto = Proto->getNumArgs(); 7560 7561 // If too few arguments are available, we'll fill in the rest with defaults. 7562 if (NumArgs < NumArgsInProto) 7563 ConvertedArgs.reserve(NumArgsInProto); 7564 else 7565 ConvertedArgs.reserve(NumArgs); 7566 7567 VariadicCallType CallType = 7568 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7569 llvm::SmallVector<Expr *, 8> AllArgs; 7570 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7571 Proto, 0, Args, NumArgs, AllArgs, 7572 CallType); 7573 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7574 ConvertedArgs.push_back(AllArgs[i]); 7575 return Invalid; 7576} 7577 7578static inline bool 7579CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7580 const FunctionDecl *FnDecl) { 7581 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7582 if (isa<NamespaceDecl>(DC)) { 7583 return SemaRef.Diag(FnDecl->getLocation(), 7584 diag::err_operator_new_delete_declared_in_namespace) 7585 << FnDecl->getDeclName(); 7586 } 7587 7588 if (isa<TranslationUnitDecl>(DC) && 7589 FnDecl->getStorageClass() == SC_Static) { 7590 return SemaRef.Diag(FnDecl->getLocation(), 7591 diag::err_operator_new_delete_declared_static) 7592 << FnDecl->getDeclName(); 7593 } 7594 7595 return false; 7596} 7597 7598static inline bool 7599CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7600 CanQualType ExpectedResultType, 7601 CanQualType ExpectedFirstParamType, 7602 unsigned DependentParamTypeDiag, 7603 unsigned InvalidParamTypeDiag) { 7604 QualType ResultType = 7605 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7606 7607 // Check that the result type is not dependent. 7608 if (ResultType->isDependentType()) 7609 return SemaRef.Diag(FnDecl->getLocation(), 7610 diag::err_operator_new_delete_dependent_result_type) 7611 << FnDecl->getDeclName() << ExpectedResultType; 7612 7613 // Check that the result type is what we expect. 7614 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7615 return SemaRef.Diag(FnDecl->getLocation(), 7616 diag::err_operator_new_delete_invalid_result_type) 7617 << FnDecl->getDeclName() << ExpectedResultType; 7618 7619 // A function template must have at least 2 parameters. 7620 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7621 return SemaRef.Diag(FnDecl->getLocation(), 7622 diag::err_operator_new_delete_template_too_few_parameters) 7623 << FnDecl->getDeclName(); 7624 7625 // The function decl must have at least 1 parameter. 7626 if (FnDecl->getNumParams() == 0) 7627 return SemaRef.Diag(FnDecl->getLocation(), 7628 diag::err_operator_new_delete_too_few_parameters) 7629 << FnDecl->getDeclName(); 7630 7631 // Check the the first parameter type is not dependent. 7632 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7633 if (FirstParamType->isDependentType()) 7634 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7635 << FnDecl->getDeclName() << ExpectedFirstParamType; 7636 7637 // Check that the first parameter type is what we expect. 7638 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7639 ExpectedFirstParamType) 7640 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7641 << FnDecl->getDeclName() << ExpectedFirstParamType; 7642 7643 return false; 7644} 7645 7646static bool 7647CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7648 // C++ [basic.stc.dynamic.allocation]p1: 7649 // A program is ill-formed if an allocation function is declared in a 7650 // namespace scope other than global scope or declared static in global 7651 // scope. 7652 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7653 return true; 7654 7655 CanQualType SizeTy = 7656 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7657 7658 // C++ [basic.stc.dynamic.allocation]p1: 7659 // The return type shall be void*. The first parameter shall have type 7660 // std::size_t. 7661 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7662 SizeTy, 7663 diag::err_operator_new_dependent_param_type, 7664 diag::err_operator_new_param_type)) 7665 return true; 7666 7667 // C++ [basic.stc.dynamic.allocation]p1: 7668 // The first parameter shall not have an associated default argument. 7669 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7670 return SemaRef.Diag(FnDecl->getLocation(), 7671 diag::err_operator_new_default_arg) 7672 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7673 7674 return false; 7675} 7676 7677static bool 7678CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7679 // C++ [basic.stc.dynamic.deallocation]p1: 7680 // A program is ill-formed if deallocation functions are declared in a 7681 // namespace scope other than global scope or declared static in global 7682 // scope. 7683 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7684 return true; 7685 7686 // C++ [basic.stc.dynamic.deallocation]p2: 7687 // Each deallocation function shall return void and its first parameter 7688 // shall be void*. 7689 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7690 SemaRef.Context.VoidPtrTy, 7691 diag::err_operator_delete_dependent_param_type, 7692 diag::err_operator_delete_param_type)) 7693 return true; 7694 7695 return false; 7696} 7697 7698/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7699/// of this overloaded operator is well-formed. If so, returns false; 7700/// otherwise, emits appropriate diagnostics and returns true. 7701bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7702 assert(FnDecl && FnDecl->isOverloadedOperator() && 7703 "Expected an overloaded operator declaration"); 7704 7705 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7706 7707 // C++ [over.oper]p5: 7708 // The allocation and deallocation functions, operator new, 7709 // operator new[], operator delete and operator delete[], are 7710 // described completely in 3.7.3. The attributes and restrictions 7711 // found in the rest of this subclause do not apply to them unless 7712 // explicitly stated in 3.7.3. 7713 if (Op == OO_Delete || Op == OO_Array_Delete) 7714 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7715 7716 if (Op == OO_New || Op == OO_Array_New) 7717 return CheckOperatorNewDeclaration(*this, FnDecl); 7718 7719 // C++ [over.oper]p6: 7720 // An operator function shall either be a non-static member 7721 // function or be a non-member function and have at least one 7722 // parameter whose type is a class, a reference to a class, an 7723 // enumeration, or a reference to an enumeration. 7724 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7725 if (MethodDecl->isStatic()) 7726 return Diag(FnDecl->getLocation(), 7727 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7728 } else { 7729 bool ClassOrEnumParam = false; 7730 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7731 ParamEnd = FnDecl->param_end(); 7732 Param != ParamEnd; ++Param) { 7733 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7734 if (ParamType->isDependentType() || ParamType->isRecordType() || 7735 ParamType->isEnumeralType()) { 7736 ClassOrEnumParam = true; 7737 break; 7738 } 7739 } 7740 7741 if (!ClassOrEnumParam) 7742 return Diag(FnDecl->getLocation(), 7743 diag::err_operator_overload_needs_class_or_enum) 7744 << FnDecl->getDeclName(); 7745 } 7746 7747 // C++ [over.oper]p8: 7748 // An operator function cannot have default arguments (8.3.6), 7749 // except where explicitly stated below. 7750 // 7751 // Only the function-call operator allows default arguments 7752 // (C++ [over.call]p1). 7753 if (Op != OO_Call) { 7754 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7755 Param != FnDecl->param_end(); ++Param) { 7756 if ((*Param)->hasDefaultArg()) 7757 return Diag((*Param)->getLocation(), 7758 diag::err_operator_overload_default_arg) 7759 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7760 } 7761 } 7762 7763 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7764 { false, false, false } 7765#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7766 , { Unary, Binary, MemberOnly } 7767#include "clang/Basic/OperatorKinds.def" 7768 }; 7769 7770 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7771 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7772 bool MustBeMemberOperator = OperatorUses[Op][2]; 7773 7774 // C++ [over.oper]p8: 7775 // [...] Operator functions cannot have more or fewer parameters 7776 // than the number required for the corresponding operator, as 7777 // described in the rest of this subclause. 7778 unsigned NumParams = FnDecl->getNumParams() 7779 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7780 if (Op != OO_Call && 7781 ((NumParams == 1 && !CanBeUnaryOperator) || 7782 (NumParams == 2 && !CanBeBinaryOperator) || 7783 (NumParams < 1) || (NumParams > 2))) { 7784 // We have the wrong number of parameters. 7785 unsigned ErrorKind; 7786 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7787 ErrorKind = 2; // 2 -> unary or binary. 7788 } else if (CanBeUnaryOperator) { 7789 ErrorKind = 0; // 0 -> unary 7790 } else { 7791 assert(CanBeBinaryOperator && 7792 "All non-call overloaded operators are unary or binary!"); 7793 ErrorKind = 1; // 1 -> binary 7794 } 7795 7796 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7797 << FnDecl->getDeclName() << NumParams << ErrorKind; 7798 } 7799 7800 // Overloaded operators other than operator() cannot be variadic. 7801 if (Op != OO_Call && 7802 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7803 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7804 << FnDecl->getDeclName(); 7805 } 7806 7807 // Some operators must be non-static member functions. 7808 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7809 return Diag(FnDecl->getLocation(), 7810 diag::err_operator_overload_must_be_member) 7811 << FnDecl->getDeclName(); 7812 } 7813 7814 // C++ [over.inc]p1: 7815 // The user-defined function called operator++ implements the 7816 // prefix and postfix ++ operator. If this function is a member 7817 // function with no parameters, or a non-member function with one 7818 // parameter of class or enumeration type, it defines the prefix 7819 // increment operator ++ for objects of that type. If the function 7820 // is a member function with one parameter (which shall be of type 7821 // int) or a non-member function with two parameters (the second 7822 // of which shall be of type int), it defines the postfix 7823 // increment operator ++ for objects of that type. 7824 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7825 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7826 bool ParamIsInt = false; 7827 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7828 ParamIsInt = BT->getKind() == BuiltinType::Int; 7829 7830 if (!ParamIsInt) 7831 return Diag(LastParam->getLocation(), 7832 diag::err_operator_overload_post_incdec_must_be_int) 7833 << LastParam->getType() << (Op == OO_MinusMinus); 7834 } 7835 7836 return false; 7837} 7838 7839/// CheckLiteralOperatorDeclaration - Check whether the declaration 7840/// of this literal operator function is well-formed. If so, returns 7841/// false; otherwise, emits appropriate diagnostics and returns true. 7842bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7843 DeclContext *DC = FnDecl->getDeclContext(); 7844 Decl::Kind Kind = DC->getDeclKind(); 7845 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7846 Kind != Decl::LinkageSpec) { 7847 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7848 << FnDecl->getDeclName(); 7849 return true; 7850 } 7851 7852 bool Valid = false; 7853 7854 // template <char...> type operator "" name() is the only valid template 7855 // signature, and the only valid signature with no parameters. 7856 if (FnDecl->param_size() == 0) { 7857 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7858 // Must have only one template parameter 7859 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7860 if (Params->size() == 1) { 7861 NonTypeTemplateParmDecl *PmDecl = 7862 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7863 7864 // The template parameter must be a char parameter pack. 7865 if (PmDecl && PmDecl->isTemplateParameterPack() && 7866 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7867 Valid = true; 7868 } 7869 } 7870 } else { 7871 // Check the first parameter 7872 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7873 7874 QualType T = (*Param)->getType(); 7875 7876 // unsigned long long int, long double, and any character type are allowed 7877 // as the only parameters. 7878 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7879 Context.hasSameType(T, Context.LongDoubleTy) || 7880 Context.hasSameType(T, Context.CharTy) || 7881 Context.hasSameType(T, Context.WCharTy) || 7882 Context.hasSameType(T, Context.Char16Ty) || 7883 Context.hasSameType(T, Context.Char32Ty)) { 7884 if (++Param == FnDecl->param_end()) 7885 Valid = true; 7886 goto FinishedParams; 7887 } 7888 7889 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7890 const PointerType *PT = T->getAs<PointerType>(); 7891 if (!PT) 7892 goto FinishedParams; 7893 T = PT->getPointeeType(); 7894 if (!T.isConstQualified()) 7895 goto FinishedParams; 7896 T = T.getUnqualifiedType(); 7897 7898 // Move on to the second parameter; 7899 ++Param; 7900 7901 // If there is no second parameter, the first must be a const char * 7902 if (Param == FnDecl->param_end()) { 7903 if (Context.hasSameType(T, Context.CharTy)) 7904 Valid = true; 7905 goto FinishedParams; 7906 } 7907 7908 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7909 // are allowed as the first parameter to a two-parameter function 7910 if (!(Context.hasSameType(T, Context.CharTy) || 7911 Context.hasSameType(T, Context.WCharTy) || 7912 Context.hasSameType(T, Context.Char16Ty) || 7913 Context.hasSameType(T, Context.Char32Ty))) 7914 goto FinishedParams; 7915 7916 // The second and final parameter must be an std::size_t 7917 T = (*Param)->getType().getUnqualifiedType(); 7918 if (Context.hasSameType(T, Context.getSizeType()) && 7919 ++Param == FnDecl->param_end()) 7920 Valid = true; 7921 } 7922 7923 // FIXME: This diagnostic is absolutely terrible. 7924FinishedParams: 7925 if (!Valid) { 7926 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7927 << FnDecl->getDeclName(); 7928 return true; 7929 } 7930 7931 return false; 7932} 7933 7934/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7935/// linkage specification, including the language and (if present) 7936/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7937/// the location of the language string literal, which is provided 7938/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7939/// the '{' brace. Otherwise, this linkage specification does not 7940/// have any braces. 7941Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7942 SourceLocation LangLoc, 7943 llvm::StringRef Lang, 7944 SourceLocation LBraceLoc) { 7945 LinkageSpecDecl::LanguageIDs Language; 7946 if (Lang == "\"C\"") 7947 Language = LinkageSpecDecl::lang_c; 7948 else if (Lang == "\"C++\"") 7949 Language = LinkageSpecDecl::lang_cxx; 7950 else { 7951 Diag(LangLoc, diag::err_bad_language); 7952 return 0; 7953 } 7954 7955 // FIXME: Add all the various semantics of linkage specifications 7956 7957 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 7958 ExternLoc, LangLoc, Language); 7959 CurContext->addDecl(D); 7960 PushDeclContext(S, D); 7961 return D; 7962} 7963 7964/// ActOnFinishLinkageSpecification - Complete the definition of 7965/// the C++ linkage specification LinkageSpec. If RBraceLoc is 7966/// valid, it's the position of the closing '}' brace in a linkage 7967/// specification that uses braces. 7968Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 7969 Decl *LinkageSpec, 7970 SourceLocation RBraceLoc) { 7971 if (LinkageSpec) { 7972 if (RBraceLoc.isValid()) { 7973 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 7974 LSDecl->setRBraceLoc(RBraceLoc); 7975 } 7976 PopDeclContext(); 7977 } 7978 return LinkageSpec; 7979} 7980 7981/// \brief Perform semantic analysis for the variable declaration that 7982/// occurs within a C++ catch clause, returning the newly-created 7983/// variable. 7984VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 7985 TypeSourceInfo *TInfo, 7986 SourceLocation StartLoc, 7987 SourceLocation Loc, 7988 IdentifierInfo *Name) { 7989 bool Invalid = false; 7990 QualType ExDeclType = TInfo->getType(); 7991 7992 // Arrays and functions decay. 7993 if (ExDeclType->isArrayType()) 7994 ExDeclType = Context.getArrayDecayedType(ExDeclType); 7995 else if (ExDeclType->isFunctionType()) 7996 ExDeclType = Context.getPointerType(ExDeclType); 7997 7998 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 7999 // The exception-declaration shall not denote a pointer or reference to an 8000 // incomplete type, other than [cv] void*. 8001 // N2844 forbids rvalue references. 8002 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 8003 Diag(Loc, diag::err_catch_rvalue_ref); 8004 Invalid = true; 8005 } 8006 8007 // GCC allows catching pointers and references to incomplete types 8008 // as an extension; so do we, but we warn by default. 8009 8010 QualType BaseType = ExDeclType; 8011 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 8012 unsigned DK = diag::err_catch_incomplete; 8013 bool IncompleteCatchIsInvalid = true; 8014 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 8015 BaseType = Ptr->getPointeeType(); 8016 Mode = 1; 8017 DK = diag::ext_catch_incomplete_ptr; 8018 IncompleteCatchIsInvalid = false; 8019 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 8020 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 8021 BaseType = Ref->getPointeeType(); 8022 Mode = 2; 8023 DK = diag::ext_catch_incomplete_ref; 8024 IncompleteCatchIsInvalid = false; 8025 } 8026 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 8027 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 8028 IncompleteCatchIsInvalid) 8029 Invalid = true; 8030 8031 if (!Invalid && !ExDeclType->isDependentType() && 8032 RequireNonAbstractType(Loc, ExDeclType, 8033 diag::err_abstract_type_in_decl, 8034 AbstractVariableType)) 8035 Invalid = true; 8036 8037 // Only the non-fragile NeXT runtime currently supports C++ catches 8038 // of ObjC types, and no runtime supports catching ObjC types by value. 8039 if (!Invalid && getLangOptions().ObjC1) { 8040 QualType T = ExDeclType; 8041 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 8042 T = RT->getPointeeType(); 8043 8044 if (T->isObjCObjectType()) { 8045 Diag(Loc, diag::err_objc_object_catch); 8046 Invalid = true; 8047 } else if (T->isObjCObjectPointerType()) { 8048 if (!getLangOptions().ObjCNonFragileABI) 8049 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 8050 } 8051 } 8052 8053 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8054 ExDeclType, TInfo, SC_None, SC_None); 8055 ExDecl->setExceptionVariable(true); 8056 8057 if (!Invalid) { 8058 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8059 // C++ [except.handle]p16: 8060 // The object declared in an exception-declaration or, if the 8061 // exception-declaration does not specify a name, a temporary (12.2) is 8062 // copy-initialized (8.5) from the exception object. [...] 8063 // The object is destroyed when the handler exits, after the destruction 8064 // of any automatic objects initialized within the handler. 8065 // 8066 // We just pretend to initialize the object with itself, then make sure 8067 // it can be destroyed later. 8068 QualType initType = ExDeclType; 8069 8070 InitializedEntity entity = 8071 InitializedEntity::InitializeVariable(ExDecl); 8072 InitializationKind initKind = 8073 InitializationKind::CreateCopy(Loc, SourceLocation()); 8074 8075 Expr *opaqueValue = 8076 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8077 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8078 ExprResult result = sequence.Perform(*this, entity, initKind, 8079 MultiExprArg(&opaqueValue, 1)); 8080 if (result.isInvalid()) 8081 Invalid = true; 8082 else { 8083 // If the constructor used was non-trivial, set this as the 8084 // "initializer". 8085 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8086 if (!construct->getConstructor()->isTrivial()) { 8087 Expr *init = MaybeCreateExprWithCleanups(construct); 8088 ExDecl->setInit(init); 8089 } 8090 8091 // And make sure it's destructable. 8092 FinalizeVarWithDestructor(ExDecl, recordType); 8093 } 8094 } 8095 } 8096 8097 if (Invalid) 8098 ExDecl->setInvalidDecl(); 8099 8100 return ExDecl; 8101} 8102 8103/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8104/// handler. 8105Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8106 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8107 bool Invalid = D.isInvalidType(); 8108 8109 // Check for unexpanded parameter packs. 8110 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8111 UPPC_ExceptionType)) { 8112 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8113 D.getIdentifierLoc()); 8114 Invalid = true; 8115 } 8116 8117 IdentifierInfo *II = D.getIdentifier(); 8118 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8119 LookupOrdinaryName, 8120 ForRedeclaration)) { 8121 // The scope should be freshly made just for us. There is just no way 8122 // it contains any previous declaration. 8123 assert(!S->isDeclScope(PrevDecl)); 8124 if (PrevDecl->isTemplateParameter()) { 8125 // Maybe we will complain about the shadowed template parameter. 8126 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8127 } 8128 } 8129 8130 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8131 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8132 << D.getCXXScopeSpec().getRange(); 8133 Invalid = true; 8134 } 8135 8136 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8137 D.getSourceRange().getBegin(), 8138 D.getIdentifierLoc(), 8139 D.getIdentifier()); 8140 if (Invalid) 8141 ExDecl->setInvalidDecl(); 8142 8143 // Add the exception declaration into this scope. 8144 if (II) 8145 PushOnScopeChains(ExDecl, S); 8146 else 8147 CurContext->addDecl(ExDecl); 8148 8149 ProcessDeclAttributes(S, ExDecl, D); 8150 return ExDecl; 8151} 8152 8153Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8154 Expr *AssertExpr, 8155 Expr *AssertMessageExpr_, 8156 SourceLocation RParenLoc) { 8157 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8158 8159 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8160 llvm::APSInt Value(32); 8161 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8162 Diag(StaticAssertLoc, 8163 diag::err_static_assert_expression_is_not_constant) << 8164 AssertExpr->getSourceRange(); 8165 return 0; 8166 } 8167 8168 if (Value == 0) { 8169 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8170 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8171 } 8172 } 8173 8174 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8175 return 0; 8176 8177 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8178 AssertExpr, AssertMessage, RParenLoc); 8179 8180 CurContext->addDecl(Decl); 8181 return Decl; 8182} 8183 8184/// \brief Perform semantic analysis of the given friend type declaration. 8185/// 8186/// \returns A friend declaration that. 8187FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8188 TypeSourceInfo *TSInfo) { 8189 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8190 8191 QualType T = TSInfo->getType(); 8192 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8193 8194 if (!getLangOptions().CPlusPlus0x) { 8195 // C++03 [class.friend]p2: 8196 // An elaborated-type-specifier shall be used in a friend declaration 8197 // for a class.* 8198 // 8199 // * The class-key of the elaborated-type-specifier is required. 8200 if (!ActiveTemplateInstantiations.empty()) { 8201 // Do not complain about the form of friend template types during 8202 // template instantiation; we will already have complained when the 8203 // template was declared. 8204 } else if (!T->isElaboratedTypeSpecifier()) { 8205 // If we evaluated the type to a record type, suggest putting 8206 // a tag in front. 8207 if (const RecordType *RT = T->getAs<RecordType>()) { 8208 RecordDecl *RD = RT->getDecl(); 8209 8210 std::string InsertionText = std::string(" ") + RD->getKindName(); 8211 8212 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8213 << (unsigned) RD->getTagKind() 8214 << T 8215 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8216 InsertionText); 8217 } else { 8218 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8219 << T 8220 << SourceRange(FriendLoc, TypeRange.getEnd()); 8221 } 8222 } else if (T->getAs<EnumType>()) { 8223 Diag(FriendLoc, diag::ext_enum_friend) 8224 << T 8225 << SourceRange(FriendLoc, TypeRange.getEnd()); 8226 } 8227 } 8228 8229 // C++0x [class.friend]p3: 8230 // If the type specifier in a friend declaration designates a (possibly 8231 // cv-qualified) class type, that class is declared as a friend; otherwise, 8232 // the friend declaration is ignored. 8233 8234 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8235 // in [class.friend]p3 that we do not implement. 8236 8237 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8238} 8239 8240/// Handle a friend tag declaration where the scope specifier was 8241/// templated. 8242Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8243 unsigned TagSpec, SourceLocation TagLoc, 8244 CXXScopeSpec &SS, 8245 IdentifierInfo *Name, SourceLocation NameLoc, 8246 AttributeList *Attr, 8247 MultiTemplateParamsArg TempParamLists) { 8248 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8249 8250 bool isExplicitSpecialization = false; 8251 bool Invalid = false; 8252 8253 if (TemplateParameterList *TemplateParams 8254 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8255 TempParamLists.get(), 8256 TempParamLists.size(), 8257 /*friend*/ true, 8258 isExplicitSpecialization, 8259 Invalid)) { 8260 if (TemplateParams->size() > 0) { 8261 // This is a declaration of a class template. 8262 if (Invalid) 8263 return 0; 8264 8265 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8266 SS, Name, NameLoc, Attr, 8267 TemplateParams, AS_public, 8268 TempParamLists.size() - 1, 8269 (TemplateParameterList**) TempParamLists.release()).take(); 8270 } else { 8271 // The "template<>" header is extraneous. 8272 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8273 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8274 isExplicitSpecialization = true; 8275 } 8276 } 8277 8278 if (Invalid) return 0; 8279 8280 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8281 8282 bool isAllExplicitSpecializations = true; 8283 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8284 if (TempParamLists.get()[I]->size()) { 8285 isAllExplicitSpecializations = false; 8286 break; 8287 } 8288 } 8289 8290 // FIXME: don't ignore attributes. 8291 8292 // If it's explicit specializations all the way down, just forget 8293 // about the template header and build an appropriate non-templated 8294 // friend. TODO: for source fidelity, remember the headers. 8295 if (isAllExplicitSpecializations) { 8296 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8297 ElaboratedTypeKeyword Keyword 8298 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8299 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8300 *Name, NameLoc); 8301 if (T.isNull()) 8302 return 0; 8303 8304 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8305 if (isa<DependentNameType>(T)) { 8306 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8307 TL.setKeywordLoc(TagLoc); 8308 TL.setQualifierLoc(QualifierLoc); 8309 TL.setNameLoc(NameLoc); 8310 } else { 8311 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8312 TL.setKeywordLoc(TagLoc); 8313 TL.setQualifierLoc(QualifierLoc); 8314 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8315 } 8316 8317 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8318 TSI, FriendLoc); 8319 Friend->setAccess(AS_public); 8320 CurContext->addDecl(Friend); 8321 return Friend; 8322 } 8323 8324 // Handle the case of a templated-scope friend class. e.g. 8325 // template <class T> class A<T>::B; 8326 // FIXME: we don't support these right now. 8327 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8328 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8329 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8330 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8331 TL.setKeywordLoc(TagLoc); 8332 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8333 TL.setNameLoc(NameLoc); 8334 8335 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8336 TSI, FriendLoc); 8337 Friend->setAccess(AS_public); 8338 Friend->setUnsupportedFriend(true); 8339 CurContext->addDecl(Friend); 8340 return Friend; 8341} 8342 8343 8344/// Handle a friend type declaration. This works in tandem with 8345/// ActOnTag. 8346/// 8347/// Notes on friend class templates: 8348/// 8349/// We generally treat friend class declarations as if they were 8350/// declaring a class. So, for example, the elaborated type specifier 8351/// in a friend declaration is required to obey the restrictions of a 8352/// class-head (i.e. no typedefs in the scope chain), template 8353/// parameters are required to match up with simple template-ids, &c. 8354/// However, unlike when declaring a template specialization, it's 8355/// okay to refer to a template specialization without an empty 8356/// template parameter declaration, e.g. 8357/// friend class A<T>::B<unsigned>; 8358/// We permit this as a special case; if there are any template 8359/// parameters present at all, require proper matching, i.e. 8360/// template <> template <class T> friend class A<int>::B; 8361Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8362 MultiTemplateParamsArg TempParams) { 8363 SourceLocation Loc = DS.getSourceRange().getBegin(); 8364 8365 assert(DS.isFriendSpecified()); 8366 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8367 8368 // Try to convert the decl specifier to a type. This works for 8369 // friend templates because ActOnTag never produces a ClassTemplateDecl 8370 // for a TUK_Friend. 8371 Declarator TheDeclarator(DS, Declarator::MemberContext); 8372 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8373 QualType T = TSI->getType(); 8374 if (TheDeclarator.isInvalidType()) 8375 return 0; 8376 8377 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8378 return 0; 8379 8380 // This is definitely an error in C++98. It's probably meant to 8381 // be forbidden in C++0x, too, but the specification is just 8382 // poorly written. 8383 // 8384 // The problem is with declarations like the following: 8385 // template <T> friend A<T>::foo; 8386 // where deciding whether a class C is a friend or not now hinges 8387 // on whether there exists an instantiation of A that causes 8388 // 'foo' to equal C. There are restrictions on class-heads 8389 // (which we declare (by fiat) elaborated friend declarations to 8390 // be) that makes this tractable. 8391 // 8392 // FIXME: handle "template <> friend class A<T>;", which 8393 // is possibly well-formed? Who even knows? 8394 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8395 Diag(Loc, diag::err_tagless_friend_type_template) 8396 << DS.getSourceRange(); 8397 return 0; 8398 } 8399 8400 // C++98 [class.friend]p1: A friend of a class is a function 8401 // or class that is not a member of the class . . . 8402 // This is fixed in DR77, which just barely didn't make the C++03 8403 // deadline. It's also a very silly restriction that seriously 8404 // affects inner classes and which nobody else seems to implement; 8405 // thus we never diagnose it, not even in -pedantic. 8406 // 8407 // But note that we could warn about it: it's always useless to 8408 // friend one of your own members (it's not, however, worthless to 8409 // friend a member of an arbitrary specialization of your template). 8410 8411 Decl *D; 8412 if (unsigned NumTempParamLists = TempParams.size()) 8413 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8414 NumTempParamLists, 8415 TempParams.release(), 8416 TSI, 8417 DS.getFriendSpecLoc()); 8418 else 8419 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8420 8421 if (!D) 8422 return 0; 8423 8424 D->setAccess(AS_public); 8425 CurContext->addDecl(D); 8426 8427 return D; 8428} 8429 8430Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8431 MultiTemplateParamsArg TemplateParams) { 8432 const DeclSpec &DS = D.getDeclSpec(); 8433 8434 assert(DS.isFriendSpecified()); 8435 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8436 8437 SourceLocation Loc = D.getIdentifierLoc(); 8438 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8439 QualType T = TInfo->getType(); 8440 8441 // C++ [class.friend]p1 8442 // A friend of a class is a function or class.... 8443 // Note that this sees through typedefs, which is intended. 8444 // It *doesn't* see through dependent types, which is correct 8445 // according to [temp.arg.type]p3: 8446 // If a declaration acquires a function type through a 8447 // type dependent on a template-parameter and this causes 8448 // a declaration that does not use the syntactic form of a 8449 // function declarator to have a function type, the program 8450 // is ill-formed. 8451 if (!T->isFunctionType()) { 8452 Diag(Loc, diag::err_unexpected_friend); 8453 8454 // It might be worthwhile to try to recover by creating an 8455 // appropriate declaration. 8456 return 0; 8457 } 8458 8459 // C++ [namespace.memdef]p3 8460 // - If a friend declaration in a non-local class first declares a 8461 // class or function, the friend class or function is a member 8462 // of the innermost enclosing namespace. 8463 // - The name of the friend is not found by simple name lookup 8464 // until a matching declaration is provided in that namespace 8465 // scope (either before or after the class declaration granting 8466 // friendship). 8467 // - If a friend function is called, its name may be found by the 8468 // name lookup that considers functions from namespaces and 8469 // classes associated with the types of the function arguments. 8470 // - When looking for a prior declaration of a class or a function 8471 // declared as a friend, scopes outside the innermost enclosing 8472 // namespace scope are not considered. 8473 8474 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8475 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8476 DeclarationName Name = NameInfo.getName(); 8477 assert(Name); 8478 8479 // Check for unexpanded parameter packs. 8480 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8481 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8482 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8483 return 0; 8484 8485 // The context we found the declaration in, or in which we should 8486 // create the declaration. 8487 DeclContext *DC; 8488 Scope *DCScope = S; 8489 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8490 ForRedeclaration); 8491 8492 // FIXME: there are different rules in local classes 8493 8494 // There are four cases here. 8495 // - There's no scope specifier, in which case we just go to the 8496 // appropriate scope and look for a function or function template 8497 // there as appropriate. 8498 // Recover from invalid scope qualifiers as if they just weren't there. 8499 if (SS.isInvalid() || !SS.isSet()) { 8500 // C++0x [namespace.memdef]p3: 8501 // If the name in a friend declaration is neither qualified nor 8502 // a template-id and the declaration is a function or an 8503 // elaborated-type-specifier, the lookup to determine whether 8504 // the entity has been previously declared shall not consider 8505 // any scopes outside the innermost enclosing namespace. 8506 // C++0x [class.friend]p11: 8507 // If a friend declaration appears in a local class and the name 8508 // specified is an unqualified name, a prior declaration is 8509 // looked up without considering scopes that are outside the 8510 // innermost enclosing non-class scope. For a friend function 8511 // declaration, if there is no prior declaration, the program is 8512 // ill-formed. 8513 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8514 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8515 8516 // Find the appropriate context according to the above. 8517 DC = CurContext; 8518 while (true) { 8519 // Skip class contexts. If someone can cite chapter and verse 8520 // for this behavior, that would be nice --- it's what GCC and 8521 // EDG do, and it seems like a reasonable intent, but the spec 8522 // really only says that checks for unqualified existing 8523 // declarations should stop at the nearest enclosing namespace, 8524 // not that they should only consider the nearest enclosing 8525 // namespace. 8526 while (DC->isRecord()) 8527 DC = DC->getParent(); 8528 8529 LookupQualifiedName(Previous, DC); 8530 8531 // TODO: decide what we think about using declarations. 8532 if (isLocal || !Previous.empty()) 8533 break; 8534 8535 if (isTemplateId) { 8536 if (isa<TranslationUnitDecl>(DC)) break; 8537 } else { 8538 if (DC->isFileContext()) break; 8539 } 8540 DC = DC->getParent(); 8541 } 8542 8543 // C++ [class.friend]p1: A friend of a class is a function or 8544 // class that is not a member of the class . . . 8545 // C++0x changes this for both friend types and functions. 8546 // Most C++ 98 compilers do seem to give an error here, so 8547 // we do, too. 8548 if (!Previous.empty() && DC->Equals(CurContext) 8549 && !getLangOptions().CPlusPlus0x) 8550 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8551 8552 DCScope = getScopeForDeclContext(S, DC); 8553 8554 // - There's a non-dependent scope specifier, in which case we 8555 // compute it and do a previous lookup there for a function 8556 // or function template. 8557 } else if (!SS.getScopeRep()->isDependent()) { 8558 DC = computeDeclContext(SS); 8559 if (!DC) return 0; 8560 8561 if (RequireCompleteDeclContext(SS, DC)) return 0; 8562 8563 LookupQualifiedName(Previous, DC); 8564 8565 // Ignore things found implicitly in the wrong scope. 8566 // TODO: better diagnostics for this case. Suggesting the right 8567 // qualified scope would be nice... 8568 LookupResult::Filter F = Previous.makeFilter(); 8569 while (F.hasNext()) { 8570 NamedDecl *D = F.next(); 8571 if (!DC->InEnclosingNamespaceSetOf( 8572 D->getDeclContext()->getRedeclContext())) 8573 F.erase(); 8574 } 8575 F.done(); 8576 8577 if (Previous.empty()) { 8578 D.setInvalidType(); 8579 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8580 return 0; 8581 } 8582 8583 // C++ [class.friend]p1: A friend of a class is a function or 8584 // class that is not a member of the class . . . 8585 if (DC->Equals(CurContext)) 8586 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8587 8588 // - There's a scope specifier that does not match any template 8589 // parameter lists, in which case we use some arbitrary context, 8590 // create a method or method template, and wait for instantiation. 8591 // - There's a scope specifier that does match some template 8592 // parameter lists, which we don't handle right now. 8593 } else { 8594 DC = CurContext; 8595 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8596 } 8597 8598 if (!DC->isRecord()) { 8599 // This implies that it has to be an operator or function. 8600 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8601 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8602 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8603 Diag(Loc, diag::err_introducing_special_friend) << 8604 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8605 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8606 return 0; 8607 } 8608 } 8609 8610 bool Redeclaration = false; 8611 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8612 move(TemplateParams), 8613 IsDefinition, 8614 Redeclaration); 8615 if (!ND) return 0; 8616 8617 assert(ND->getDeclContext() == DC); 8618 assert(ND->getLexicalDeclContext() == CurContext); 8619 8620 // Add the function declaration to the appropriate lookup tables, 8621 // adjusting the redeclarations list as necessary. We don't 8622 // want to do this yet if the friending class is dependent. 8623 // 8624 // Also update the scope-based lookup if the target context's 8625 // lookup context is in lexical scope. 8626 if (!CurContext->isDependentContext()) { 8627 DC = DC->getRedeclContext(); 8628 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8629 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8630 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8631 } 8632 8633 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8634 D.getIdentifierLoc(), ND, 8635 DS.getFriendSpecLoc()); 8636 FrD->setAccess(AS_public); 8637 CurContext->addDecl(FrD); 8638 8639 if (ND->isInvalidDecl()) 8640 FrD->setInvalidDecl(); 8641 else { 8642 FunctionDecl *FD; 8643 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8644 FD = FTD->getTemplatedDecl(); 8645 else 8646 FD = cast<FunctionDecl>(ND); 8647 8648 // Mark templated-scope function declarations as unsupported. 8649 if (FD->getNumTemplateParameterLists()) 8650 FrD->setUnsupportedFriend(true); 8651 } 8652 8653 return ND; 8654} 8655 8656void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8657 AdjustDeclIfTemplate(Dcl); 8658 8659 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8660 if (!Fn) { 8661 Diag(DelLoc, diag::err_deleted_non_function); 8662 return; 8663 } 8664 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8665 Diag(DelLoc, diag::err_deleted_decl_not_first); 8666 Diag(Prev->getLocation(), diag::note_previous_declaration); 8667 // If the declaration wasn't the first, we delete the function anyway for 8668 // recovery. 8669 } 8670 Fn->setDeletedAsWritten(); 8671} 8672 8673void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8674 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8675 8676 if (MD) { 8677 if (MD->getParent()->isDependentType()) { 8678 MD->setDefaulted(); 8679 MD->setExplicitlyDefaulted(); 8680 return; 8681 } 8682 8683 CXXSpecialMember Member = getSpecialMember(MD); 8684 if (Member == CXXInvalid) { 8685 Diag(DefaultLoc, diag::err_default_special_members); 8686 return; 8687 } 8688 8689 MD->setDefaulted(); 8690 MD->setExplicitlyDefaulted(); 8691 8692 // If this definition appears within the record, do the checking when 8693 // the record is complete. 8694 const FunctionDecl *Primary = MD; 8695 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 8696 // Find the uninstantiated declaration that actually had the '= default' 8697 // on it. 8698 MD->getTemplateInstantiationPattern()->isDefined(Primary); 8699 8700 if (Primary == Primary->getCanonicalDecl()) 8701 return; 8702 8703 switch (Member) { 8704 case CXXDefaultConstructor: { 8705 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8706 CheckExplicitlyDefaultedDefaultConstructor(CD); 8707 if (!CD->isInvalidDecl()) 8708 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8709 break; 8710 } 8711 8712 case CXXCopyConstructor: { 8713 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8714 CheckExplicitlyDefaultedCopyConstructor(CD); 8715 if (!CD->isInvalidDecl()) 8716 DefineImplicitCopyConstructor(DefaultLoc, CD); 8717 break; 8718 } 8719 8720 case CXXCopyAssignment: { 8721 CheckExplicitlyDefaultedCopyAssignment(MD); 8722 if (!MD->isInvalidDecl()) 8723 DefineImplicitCopyAssignment(DefaultLoc, MD); 8724 break; 8725 } 8726 8727 case CXXDestructor: { 8728 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8729 CheckExplicitlyDefaultedDestructor(DD); 8730 if (!DD->isInvalidDecl()) 8731 DefineImplicitDestructor(DefaultLoc, DD); 8732 break; 8733 } 8734 8735 case CXXMoveConstructor: 8736 case CXXMoveAssignment: 8737 Diag(Dcl->getLocation(), diag::err_defaulted_move_unsupported); 8738 break; 8739 8740 default: 8741 // FIXME: Do the rest once we have move functions 8742 break; 8743 } 8744 } else { 8745 Diag(DefaultLoc, diag::err_default_special_members); 8746 } 8747} 8748 8749static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8750 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8751 Stmt *SubStmt = *CI; 8752 if (!SubStmt) 8753 continue; 8754 if (isa<ReturnStmt>(SubStmt)) 8755 Self.Diag(SubStmt->getSourceRange().getBegin(), 8756 diag::err_return_in_constructor_handler); 8757 if (!isa<Expr>(SubStmt)) 8758 SearchForReturnInStmt(Self, SubStmt); 8759 } 8760} 8761 8762void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8763 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8764 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8765 SearchForReturnInStmt(*this, Handler); 8766 } 8767} 8768 8769bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8770 const CXXMethodDecl *Old) { 8771 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8772 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8773 8774 if (Context.hasSameType(NewTy, OldTy) || 8775 NewTy->isDependentType() || OldTy->isDependentType()) 8776 return false; 8777 8778 // Check if the return types are covariant 8779 QualType NewClassTy, OldClassTy; 8780 8781 /// Both types must be pointers or references to classes. 8782 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8783 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8784 NewClassTy = NewPT->getPointeeType(); 8785 OldClassTy = OldPT->getPointeeType(); 8786 } 8787 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8788 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8789 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8790 NewClassTy = NewRT->getPointeeType(); 8791 OldClassTy = OldRT->getPointeeType(); 8792 } 8793 } 8794 } 8795 8796 // The return types aren't either both pointers or references to a class type. 8797 if (NewClassTy.isNull()) { 8798 Diag(New->getLocation(), 8799 diag::err_different_return_type_for_overriding_virtual_function) 8800 << New->getDeclName() << NewTy << OldTy; 8801 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8802 8803 return true; 8804 } 8805 8806 // C++ [class.virtual]p6: 8807 // If the return type of D::f differs from the return type of B::f, the 8808 // class type in the return type of D::f shall be complete at the point of 8809 // declaration of D::f or shall be the class type D. 8810 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8811 if (!RT->isBeingDefined() && 8812 RequireCompleteType(New->getLocation(), NewClassTy, 8813 PDiag(diag::err_covariant_return_incomplete) 8814 << New->getDeclName())) 8815 return true; 8816 } 8817 8818 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8819 // Check if the new class derives from the old class. 8820 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8821 Diag(New->getLocation(), 8822 diag::err_covariant_return_not_derived) 8823 << New->getDeclName() << NewTy << OldTy; 8824 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8825 return true; 8826 } 8827 8828 // Check if we the conversion from derived to base is valid. 8829 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8830 diag::err_covariant_return_inaccessible_base, 8831 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8832 // FIXME: Should this point to the return type? 8833 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8834 // FIXME: this note won't trigger for delayed access control 8835 // diagnostics, and it's impossible to get an undelayed error 8836 // here from access control during the original parse because 8837 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8838 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8839 return true; 8840 } 8841 } 8842 8843 // The qualifiers of the return types must be the same. 8844 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8845 Diag(New->getLocation(), 8846 diag::err_covariant_return_type_different_qualifications) 8847 << New->getDeclName() << NewTy << OldTy; 8848 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8849 return true; 8850 }; 8851 8852 8853 // The new class type must have the same or less qualifiers as the old type. 8854 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8855 Diag(New->getLocation(), 8856 diag::err_covariant_return_type_class_type_more_qualified) 8857 << New->getDeclName() << NewTy << OldTy; 8858 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8859 return true; 8860 }; 8861 8862 return false; 8863} 8864 8865/// \brief Mark the given method pure. 8866/// 8867/// \param Method the method to be marked pure. 8868/// 8869/// \param InitRange the source range that covers the "0" initializer. 8870bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8871 SourceLocation EndLoc = InitRange.getEnd(); 8872 if (EndLoc.isValid()) 8873 Method->setRangeEnd(EndLoc); 8874 8875 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8876 Method->setPure(); 8877 return false; 8878 } 8879 8880 if (!Method->isInvalidDecl()) 8881 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8882 << Method->getDeclName() << InitRange; 8883 return true; 8884} 8885 8886/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8887/// an initializer for the out-of-line declaration 'Dcl'. The scope 8888/// is a fresh scope pushed for just this purpose. 8889/// 8890/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8891/// static data member of class X, names should be looked up in the scope of 8892/// class X. 8893void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8894 // If there is no declaration, there was an error parsing it. 8895 if (D == 0 || D->isInvalidDecl()) return; 8896 8897 // We should only get called for declarations with scope specifiers, like: 8898 // int foo::bar; 8899 assert(D->isOutOfLine()); 8900 EnterDeclaratorContext(S, D->getDeclContext()); 8901} 8902 8903/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8904/// initializer for the out-of-line declaration 'D'. 8905void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8906 // If there is no declaration, there was an error parsing it. 8907 if (D == 0 || D->isInvalidDecl()) return; 8908 8909 assert(D->isOutOfLine()); 8910 ExitDeclaratorContext(S); 8911} 8912 8913/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8914/// C++ if/switch/while/for statement. 8915/// e.g: "if (int x = f()) {...}" 8916DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8917 // C++ 6.4p2: 8918 // The declarator shall not specify a function or an array. 8919 // The type-specifier-seq shall not contain typedef and shall not declare a 8920 // new class or enumeration. 8921 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8922 "Parser allowed 'typedef' as storage class of condition decl."); 8923 8924 TagDecl *OwnedTag = 0; 8925 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 8926 QualType Ty = TInfo->getType(); 8927 8928 if (Ty->isFunctionType()) { // The declarator shall not specify a function... 8929 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl 8930 // would be created and CXXConditionDeclExpr wants a VarDecl. 8931 Diag(D.getIdentifierLoc(), diag::err_invalid_use_of_function_type) 8932 << D.getSourceRange(); 8933 return DeclResult(); 8934 } else if (OwnedTag && OwnedTag->isDefinition()) { 8935 // The type-specifier-seq shall not declare a new class or enumeration. 8936 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition); 8937 } 8938 8939 Decl *Dcl = ActOnDeclarator(S, D); 8940 if (!Dcl) 8941 return DeclResult(); 8942 8943 return Dcl; 8944} 8945 8946void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 8947 bool DefinitionRequired) { 8948 // Ignore any vtable uses in unevaluated operands or for classes that do 8949 // not have a vtable. 8950 if (!Class->isDynamicClass() || Class->isDependentContext() || 8951 CurContext->isDependentContext() || 8952 ExprEvalContexts.back().Context == Unevaluated) 8953 return; 8954 8955 // Try to insert this class into the map. 8956 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 8957 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 8958 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 8959 if (!Pos.second) { 8960 // If we already had an entry, check to see if we are promoting this vtable 8961 // to required a definition. If so, we need to reappend to the VTableUses 8962 // list, since we may have already processed the first entry. 8963 if (DefinitionRequired && !Pos.first->second) { 8964 Pos.first->second = true; 8965 } else { 8966 // Otherwise, we can early exit. 8967 return; 8968 } 8969 } 8970 8971 // Local classes need to have their virtual members marked 8972 // immediately. For all other classes, we mark their virtual members 8973 // at the end of the translation unit. 8974 if (Class->isLocalClass()) 8975 MarkVirtualMembersReferenced(Loc, Class); 8976 else 8977 VTableUses.push_back(std::make_pair(Class, Loc)); 8978} 8979 8980bool Sema::DefineUsedVTables() { 8981 if (VTableUses.empty()) 8982 return false; 8983 8984 // Note: The VTableUses vector could grow as a result of marking 8985 // the members of a class as "used", so we check the size each 8986 // time through the loop and prefer indices (with are stable) to 8987 // iterators (which are not). 8988 bool DefinedAnything = false; 8989 for (unsigned I = 0; I != VTableUses.size(); ++I) { 8990 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 8991 if (!Class) 8992 continue; 8993 8994 SourceLocation Loc = VTableUses[I].second; 8995 8996 // If this class has a key function, but that key function is 8997 // defined in another translation unit, we don't need to emit the 8998 // vtable even though we're using it. 8999 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 9000 if (KeyFunction && !KeyFunction->hasBody()) { 9001 switch (KeyFunction->getTemplateSpecializationKind()) { 9002 case TSK_Undeclared: 9003 case TSK_ExplicitSpecialization: 9004 case TSK_ExplicitInstantiationDeclaration: 9005 // The key function is in another translation unit. 9006 continue; 9007 9008 case TSK_ExplicitInstantiationDefinition: 9009 case TSK_ImplicitInstantiation: 9010 // We will be instantiating the key function. 9011 break; 9012 } 9013 } else if (!KeyFunction) { 9014 // If we have a class with no key function that is the subject 9015 // of an explicit instantiation declaration, suppress the 9016 // vtable; it will live with the explicit instantiation 9017 // definition. 9018 bool IsExplicitInstantiationDeclaration 9019 = Class->getTemplateSpecializationKind() 9020 == TSK_ExplicitInstantiationDeclaration; 9021 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 9022 REnd = Class->redecls_end(); 9023 R != REnd; ++R) { 9024 TemplateSpecializationKind TSK 9025 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 9026 if (TSK == TSK_ExplicitInstantiationDeclaration) 9027 IsExplicitInstantiationDeclaration = true; 9028 else if (TSK == TSK_ExplicitInstantiationDefinition) { 9029 IsExplicitInstantiationDeclaration = false; 9030 break; 9031 } 9032 } 9033 9034 if (IsExplicitInstantiationDeclaration) 9035 continue; 9036 } 9037 9038 // Mark all of the virtual members of this class as referenced, so 9039 // that we can build a vtable. Then, tell the AST consumer that a 9040 // vtable for this class is required. 9041 DefinedAnything = true; 9042 MarkVirtualMembersReferenced(Loc, Class); 9043 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9044 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 9045 9046 // Optionally warn if we're emitting a weak vtable. 9047 if (Class->getLinkage() == ExternalLinkage && 9048 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 9049 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 9050 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 9051 } 9052 } 9053 VTableUses.clear(); 9054 9055 return DefinedAnything; 9056} 9057 9058void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 9059 const CXXRecordDecl *RD) { 9060 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 9061 e = RD->method_end(); i != e; ++i) { 9062 CXXMethodDecl *MD = *i; 9063 9064 // C++ [basic.def.odr]p2: 9065 // [...] A virtual member function is used if it is not pure. [...] 9066 if (MD->isVirtual() && !MD->isPure()) 9067 MarkDeclarationReferenced(Loc, MD); 9068 } 9069 9070 // Only classes that have virtual bases need a VTT. 9071 if (RD->getNumVBases() == 0) 9072 return; 9073 9074 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9075 e = RD->bases_end(); i != e; ++i) { 9076 const CXXRecordDecl *Base = 9077 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9078 if (Base->getNumVBases() == 0) 9079 continue; 9080 MarkVirtualMembersReferenced(Loc, Base); 9081 } 9082} 9083 9084/// SetIvarInitializers - This routine builds initialization ASTs for the 9085/// Objective-C implementation whose ivars need be initialized. 9086void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9087 if (!getLangOptions().CPlusPlus) 9088 return; 9089 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9090 llvm::SmallVector<ObjCIvarDecl*, 8> ivars; 9091 CollectIvarsToConstructOrDestruct(OID, ivars); 9092 if (ivars.empty()) 9093 return; 9094 llvm::SmallVector<CXXCtorInitializer*, 32> AllToInit; 9095 for (unsigned i = 0; i < ivars.size(); i++) { 9096 FieldDecl *Field = ivars[i]; 9097 if (Field->isInvalidDecl()) 9098 continue; 9099 9100 CXXCtorInitializer *Member; 9101 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9102 InitializationKind InitKind = 9103 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9104 9105 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9106 ExprResult MemberInit = 9107 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9108 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9109 // Note, MemberInit could actually come back empty if no initialization 9110 // is required (e.g., because it would call a trivial default constructor) 9111 if (!MemberInit.get() || MemberInit.isInvalid()) 9112 continue; 9113 9114 Member = 9115 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9116 SourceLocation(), 9117 MemberInit.takeAs<Expr>(), 9118 SourceLocation()); 9119 AllToInit.push_back(Member); 9120 9121 // Be sure that the destructor is accessible and is marked as referenced. 9122 if (const RecordType *RecordTy 9123 = Context.getBaseElementType(Field->getType()) 9124 ->getAs<RecordType>()) { 9125 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9126 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9127 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9128 CheckDestructorAccess(Field->getLocation(), Destructor, 9129 PDiag(diag::err_access_dtor_ivar) 9130 << Context.getBaseElementType(Field->getType())); 9131 } 9132 } 9133 } 9134 ObjCImplementation->setIvarInitializers(Context, 9135 AllToInit.data(), AllToInit.size()); 9136 } 9137} 9138 9139static 9140void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9141 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9142 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9143 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9144 Sema &S) { 9145 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9146 CE = Current.end(); 9147 if (Ctor->isInvalidDecl()) 9148 return; 9149 9150 const FunctionDecl *FNTarget = 0; 9151 CXXConstructorDecl *Target; 9152 9153 // We ignore the result here since if we don't have a body, Target will be 9154 // null below. 9155 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9156 Target 9157= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9158 9159 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9160 // Avoid dereferencing a null pointer here. 9161 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9162 9163 if (!Current.insert(Canonical)) 9164 return; 9165 9166 // We know that beyond here, we aren't chaining into a cycle. 9167 if (!Target || !Target->isDelegatingConstructor() || 9168 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9169 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9170 Valid.insert(*CI); 9171 Current.clear(); 9172 // We've hit a cycle. 9173 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9174 Current.count(TCanonical)) { 9175 // If we haven't diagnosed this cycle yet, do so now. 9176 if (!Invalid.count(TCanonical)) { 9177 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9178 diag::warn_delegating_ctor_cycle) 9179 << Ctor; 9180 9181 // Don't add a note for a function delegating directo to itself. 9182 if (TCanonical != Canonical) 9183 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9184 9185 CXXConstructorDecl *C = Target; 9186 while (C->getCanonicalDecl() != Canonical) { 9187 (void)C->getTargetConstructor()->hasBody(FNTarget); 9188 assert(FNTarget && "Ctor cycle through bodiless function"); 9189 9190 C 9191 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9192 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9193 } 9194 } 9195 9196 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9197 Invalid.insert(*CI); 9198 Current.clear(); 9199 } else { 9200 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9201 } 9202} 9203 9204 9205void Sema::CheckDelegatingCtorCycles() { 9206 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9207 9208 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9209 CE = Current.end(); 9210 9211 for (llvm::SmallVector<CXXConstructorDecl*, 4>::iterator 9212 I = DelegatingCtorDecls.begin(), 9213 E = DelegatingCtorDecls.end(); 9214 I != E; ++I) { 9215 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9216 } 9217 9218 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9219 (*CI)->setInvalidDecl(); 9220} 9221