SemaDeclCXX.cpp revision 4278c654b645402554eb52a48e9c7097c9f1233a
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().MicrosoftExt) { 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, CXXBaseSpecifier **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 = 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 Expr *BW, const VirtSpecifiers &VS, 1064 Expr *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 = D.isDeclarationOfFunction(); 1083 1084 // C++ 9.2p6: A member shall not be declared to have automatic storage 1085 // duration (auto, register) or with the extern storage-class-specifier. 1086 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1087 // data members and cannot be applied to names declared const or static, 1088 // and cannot be applied to reference members. 1089 switch (DS.getStorageClassSpec()) { 1090 case DeclSpec::SCS_unspecified: 1091 case DeclSpec::SCS_typedef: 1092 case DeclSpec::SCS_static: 1093 // FALL THROUGH. 1094 break; 1095 case DeclSpec::SCS_mutable: 1096 if (isFunc) { 1097 if (DS.getStorageClassSpecLoc().isValid()) 1098 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1099 else 1100 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1101 1102 // FIXME: It would be nicer if the keyword was ignored only for this 1103 // declarator. Otherwise we could get follow-up errors. 1104 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1105 } 1106 break; 1107 default: 1108 if (DS.getStorageClassSpecLoc().isValid()) 1109 Diag(DS.getStorageClassSpecLoc(), 1110 diag::err_storageclass_invalid_for_member); 1111 else 1112 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1113 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1114 } 1115 1116 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1117 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1118 !isFunc); 1119 1120 Decl *Member; 1121 if (isInstField) { 1122 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1123 1124 // FIXME: Check that the name is an identifier! 1125 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1126 1127 // Member field could not be with "template" keyword. 1128 // So TemplateParameterLists should be empty in this case. 1129 if (TemplateParameterLists.size()) { 1130 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1131 if (TemplateParams->size()) { 1132 // There is no such thing as a member field template. 1133 Diag(D.getIdentifierLoc(), diag::err_template_member) 1134 << II 1135 << SourceRange(TemplateParams->getTemplateLoc(), 1136 TemplateParams->getRAngleLoc()); 1137 } else { 1138 // There is an extraneous 'template<>' for this member. 1139 Diag(TemplateParams->getTemplateLoc(), 1140 diag::err_template_member_noparams) 1141 << II 1142 << SourceRange(TemplateParams->getTemplateLoc(), 1143 TemplateParams->getRAngleLoc()); 1144 } 1145 return 0; 1146 } 1147 1148 if (SS.isSet() && !SS.isInvalid()) { 1149 // The user provided a superfluous scope specifier inside a class 1150 // definition: 1151 // 1152 // class X { 1153 // int X::member; 1154 // }; 1155 DeclContext *DC = 0; 1156 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1157 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1158 << Name << FixItHint::CreateRemoval(SS.getRange()); 1159 else 1160 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1161 << Name << SS.getRange(); 1162 1163 SS.clear(); 1164 } 1165 1166 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1167 HasDeferredInit, AS); 1168 assert(Member && "HandleField never returns null"); 1169 } else { 1170 assert(!HasDeferredInit); 1171 1172 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1173 if (!Member) { 1174 return 0; 1175 } 1176 1177 // Non-instance-fields can't have a bitfield. 1178 if (BitWidth) { 1179 if (Member->isInvalidDecl()) { 1180 // don't emit another diagnostic. 1181 } else if (isa<VarDecl>(Member)) { 1182 // C++ 9.6p3: A bit-field shall not be a static member. 1183 // "static member 'A' cannot be a bit-field" 1184 Diag(Loc, diag::err_static_not_bitfield) 1185 << Name << BitWidth->getSourceRange(); 1186 } else if (isa<TypedefDecl>(Member)) { 1187 // "typedef member 'x' cannot be a bit-field" 1188 Diag(Loc, diag::err_typedef_not_bitfield) 1189 << Name << BitWidth->getSourceRange(); 1190 } else { 1191 // A function typedef ("typedef int f(); f a;"). 1192 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1193 Diag(Loc, diag::err_not_integral_type_bitfield) 1194 << Name << cast<ValueDecl>(Member)->getType() 1195 << BitWidth->getSourceRange(); 1196 } 1197 1198 BitWidth = 0; 1199 Member->setInvalidDecl(); 1200 } 1201 1202 Member->setAccess(AS); 1203 1204 // If we have declared a member function template, set the access of the 1205 // templated declaration as well. 1206 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1207 FunTmpl->getTemplatedDecl()->setAccess(AS); 1208 } 1209 1210 if (VS.isOverrideSpecified()) { 1211 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1212 if (!MD || !MD->isVirtual()) { 1213 Diag(Member->getLocStart(), 1214 diag::override_keyword_only_allowed_on_virtual_member_functions) 1215 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1216 } else 1217 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1218 } 1219 if (VS.isFinalSpecified()) { 1220 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1221 if (!MD || !MD->isVirtual()) { 1222 Diag(Member->getLocStart(), 1223 diag::override_keyword_only_allowed_on_virtual_member_functions) 1224 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1225 } else 1226 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1227 } 1228 1229 if (VS.getLastLocation().isValid()) { 1230 // Update the end location of a method that has a virt-specifiers. 1231 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1232 MD->setRangeEnd(VS.getLastLocation()); 1233 } 1234 1235 CheckOverrideControl(Member); 1236 1237 assert((Name || isInstField) && "No identifier for non-field ?"); 1238 1239 if (Init) 1240 AddInitializerToDecl(Member, Init, false, 1241 DS.getTypeSpecType() == DeclSpec::TST_auto); 1242 else if (DS.getTypeSpecType() == DeclSpec::TST_auto && 1243 DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1244 // C++0x [dcl.spec.auto]p4: 'auto' can only be used in the type of a static 1245 // data member if a brace-or-equal-initializer is provided. 1246 Diag(Loc, diag::err_auto_var_requires_init) 1247 << Name << cast<ValueDecl>(Member)->getType(); 1248 Member->setInvalidDecl(); 1249 } 1250 1251 FinalizeDeclaration(Member); 1252 1253 if (isInstField) 1254 FieldCollector->Add(cast<FieldDecl>(Member)); 1255 return Member; 1256} 1257 1258/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1259/// in-class initializer for a non-static C++ class member, and after 1260/// instantiating an in-class initializer in a class template. Such actions 1261/// are deferred until the class is complete. 1262void 1263Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1264 Expr *InitExpr) { 1265 FieldDecl *FD = cast<FieldDecl>(D); 1266 1267 if (!InitExpr) { 1268 FD->setInvalidDecl(); 1269 FD->removeInClassInitializer(); 1270 return; 1271 } 1272 1273 ExprResult Init = InitExpr; 1274 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1275 // FIXME: if there is no EqualLoc, this is list-initialization. 1276 Init = PerformCopyInitialization( 1277 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1278 if (Init.isInvalid()) { 1279 FD->setInvalidDecl(); 1280 return; 1281 } 1282 1283 CheckImplicitConversions(Init.get(), EqualLoc); 1284 } 1285 1286 // C++0x [class.base.init]p7: 1287 // The initialization of each base and member constitutes a 1288 // full-expression. 1289 Init = MaybeCreateExprWithCleanups(Init); 1290 if (Init.isInvalid()) { 1291 FD->setInvalidDecl(); 1292 return; 1293 } 1294 1295 InitExpr = Init.release(); 1296 1297 FD->setInClassInitializer(InitExpr); 1298} 1299 1300/// \brief Find the direct and/or virtual base specifiers that 1301/// correspond to the given base type, for use in base initialization 1302/// within a constructor. 1303static bool FindBaseInitializer(Sema &SemaRef, 1304 CXXRecordDecl *ClassDecl, 1305 QualType BaseType, 1306 const CXXBaseSpecifier *&DirectBaseSpec, 1307 const CXXBaseSpecifier *&VirtualBaseSpec) { 1308 // First, check for a direct base class. 1309 DirectBaseSpec = 0; 1310 for (CXXRecordDecl::base_class_const_iterator Base 1311 = ClassDecl->bases_begin(); 1312 Base != ClassDecl->bases_end(); ++Base) { 1313 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1314 // We found a direct base of this type. That's what we're 1315 // initializing. 1316 DirectBaseSpec = &*Base; 1317 break; 1318 } 1319 } 1320 1321 // Check for a virtual base class. 1322 // FIXME: We might be able to short-circuit this if we know in advance that 1323 // there are no virtual bases. 1324 VirtualBaseSpec = 0; 1325 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1326 // We haven't found a base yet; search the class hierarchy for a 1327 // virtual base class. 1328 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1329 /*DetectVirtual=*/false); 1330 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1331 BaseType, Paths)) { 1332 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1333 Path != Paths.end(); ++Path) { 1334 if (Path->back().Base->isVirtual()) { 1335 VirtualBaseSpec = Path->back().Base; 1336 break; 1337 } 1338 } 1339 } 1340 } 1341 1342 return DirectBaseSpec || VirtualBaseSpec; 1343} 1344 1345/// ActOnMemInitializer - Handle a C++ member initializer. 1346MemInitResult 1347Sema::ActOnMemInitializer(Decl *ConstructorD, 1348 Scope *S, 1349 CXXScopeSpec &SS, 1350 IdentifierInfo *MemberOrBase, 1351 ParsedType TemplateTypeTy, 1352 SourceLocation IdLoc, 1353 SourceLocation LParenLoc, 1354 Expr **Args, unsigned NumArgs, 1355 SourceLocation RParenLoc, 1356 SourceLocation EllipsisLoc) { 1357 if (!ConstructorD) 1358 return true; 1359 1360 AdjustDeclIfTemplate(ConstructorD); 1361 1362 CXXConstructorDecl *Constructor 1363 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1364 if (!Constructor) { 1365 // The user wrote a constructor initializer on a function that is 1366 // not a C++ constructor. Ignore the error for now, because we may 1367 // have more member initializers coming; we'll diagnose it just 1368 // once in ActOnMemInitializers. 1369 return true; 1370 } 1371 1372 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1373 1374 // C++ [class.base.init]p2: 1375 // Names in a mem-initializer-id are looked up in the scope of the 1376 // constructor's class and, if not found in that scope, are looked 1377 // up in the scope containing the constructor's definition. 1378 // [Note: if the constructor's class contains a member with the 1379 // same name as a direct or virtual base class of the class, a 1380 // mem-initializer-id naming the member or base class and composed 1381 // of a single identifier refers to the class member. A 1382 // mem-initializer-id for the hidden base class may be specified 1383 // using a qualified name. ] 1384 if (!SS.getScopeRep() && !TemplateTypeTy) { 1385 // Look for a member, first. 1386 FieldDecl *Member = 0; 1387 DeclContext::lookup_result Result 1388 = ClassDecl->lookup(MemberOrBase); 1389 if (Result.first != Result.second) { 1390 Member = dyn_cast<FieldDecl>(*Result.first); 1391 1392 if (Member) { 1393 if (EllipsisLoc.isValid()) 1394 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1395 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1396 1397 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1398 LParenLoc, RParenLoc); 1399 } 1400 1401 // Handle anonymous union case. 1402 if (IndirectFieldDecl* IndirectField 1403 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1404 if (EllipsisLoc.isValid()) 1405 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1406 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1407 1408 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1409 NumArgs, IdLoc, 1410 LParenLoc, RParenLoc); 1411 } 1412 } 1413 } 1414 // It didn't name a member, so see if it names a class. 1415 QualType BaseType; 1416 TypeSourceInfo *TInfo = 0; 1417 1418 if (TemplateTypeTy) { 1419 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1420 } else { 1421 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1422 LookupParsedName(R, S, &SS); 1423 1424 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1425 if (!TyD) { 1426 if (R.isAmbiguous()) return true; 1427 1428 // We don't want access-control diagnostics here. 1429 R.suppressDiagnostics(); 1430 1431 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1432 bool NotUnknownSpecialization = false; 1433 DeclContext *DC = computeDeclContext(SS, false); 1434 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1435 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1436 1437 if (!NotUnknownSpecialization) { 1438 // When the scope specifier can refer to a member of an unknown 1439 // specialization, we take it as a type name. 1440 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1441 SS.getWithLocInContext(Context), 1442 *MemberOrBase, IdLoc); 1443 if (BaseType.isNull()) 1444 return true; 1445 1446 R.clear(); 1447 R.setLookupName(MemberOrBase); 1448 } 1449 } 1450 1451 // If no results were found, try to correct typos. 1452 TypoCorrection Corr; 1453 if (R.empty() && BaseType.isNull() && 1454 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1455 ClassDecl, false, CTC_NoKeywords))) { 1456 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1457 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1458 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1459 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1460 // We have found a non-static data member with a similar 1461 // name to what was typed; complain and initialize that 1462 // member. 1463 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1464 << MemberOrBase << true << CorrectedQuotedStr 1465 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1466 Diag(Member->getLocation(), diag::note_previous_decl) 1467 << CorrectedQuotedStr; 1468 1469 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1470 LParenLoc, RParenLoc); 1471 } 1472 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1473 const CXXBaseSpecifier *DirectBaseSpec; 1474 const CXXBaseSpecifier *VirtualBaseSpec; 1475 if (FindBaseInitializer(*this, ClassDecl, 1476 Context.getTypeDeclType(Type), 1477 DirectBaseSpec, VirtualBaseSpec)) { 1478 // We have found a direct or virtual base class with a 1479 // similar name to what was typed; complain and initialize 1480 // that base class. 1481 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1482 << MemberOrBase << false << CorrectedQuotedStr 1483 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1484 1485 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1486 : VirtualBaseSpec; 1487 Diag(BaseSpec->getSourceRange().getBegin(), 1488 diag::note_base_class_specified_here) 1489 << BaseSpec->getType() 1490 << BaseSpec->getSourceRange(); 1491 1492 TyD = Type; 1493 } 1494 } 1495 } 1496 1497 if (!TyD && BaseType.isNull()) { 1498 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1499 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1500 return true; 1501 } 1502 } 1503 1504 if (BaseType.isNull()) { 1505 BaseType = Context.getTypeDeclType(TyD); 1506 if (SS.isSet()) { 1507 NestedNameSpecifier *Qualifier = 1508 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1509 1510 // FIXME: preserve source range information 1511 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1512 } 1513 } 1514 } 1515 1516 if (!TInfo) 1517 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1518 1519 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1520 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1521} 1522 1523/// Checks a member initializer expression for cases where reference (or 1524/// pointer) members are bound to by-value parameters (or their addresses). 1525static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1526 Expr *Init, 1527 SourceLocation IdLoc) { 1528 QualType MemberTy = Member->getType(); 1529 1530 // We only handle pointers and references currently. 1531 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1532 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1533 return; 1534 1535 const bool IsPointer = MemberTy->isPointerType(); 1536 if (IsPointer) { 1537 if (const UnaryOperator *Op 1538 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1539 // The only case we're worried about with pointers requires taking the 1540 // address. 1541 if (Op->getOpcode() != UO_AddrOf) 1542 return; 1543 1544 Init = Op->getSubExpr(); 1545 } else { 1546 // We only handle address-of expression initializers for pointers. 1547 return; 1548 } 1549 } 1550 1551 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1552 // Taking the address of a temporary will be diagnosed as a hard error. 1553 if (IsPointer) 1554 return; 1555 1556 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1557 << Member << Init->getSourceRange(); 1558 } else if (const DeclRefExpr *DRE 1559 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1560 // We only warn when referring to a non-reference parameter declaration. 1561 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1562 if (!Parameter || Parameter->getType()->isReferenceType()) 1563 return; 1564 1565 S.Diag(Init->getExprLoc(), 1566 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1567 : diag::warn_bind_ref_member_to_parameter) 1568 << Member << Parameter << Init->getSourceRange(); 1569 } else { 1570 // Other initializers are fine. 1571 return; 1572 } 1573 1574 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1575 << (unsigned)IsPointer; 1576} 1577 1578/// Checks an initializer expression for use of uninitialized fields, such as 1579/// containing the field that is being initialized. Returns true if there is an 1580/// uninitialized field was used an updates the SourceLocation parameter; false 1581/// otherwise. 1582static bool InitExprContainsUninitializedFields(const Stmt *S, 1583 const ValueDecl *LhsField, 1584 SourceLocation *L) { 1585 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1586 1587 if (isa<CallExpr>(S)) { 1588 // Do not descend into function calls or constructors, as the use 1589 // of an uninitialized field may be valid. One would have to inspect 1590 // the contents of the function/ctor to determine if it is safe or not. 1591 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1592 // may be safe, depending on what the function/ctor does. 1593 return false; 1594 } 1595 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1596 const NamedDecl *RhsField = ME->getMemberDecl(); 1597 1598 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1599 // The member expression points to a static data member. 1600 assert(VD->isStaticDataMember() && 1601 "Member points to non-static data member!"); 1602 (void)VD; 1603 return false; 1604 } 1605 1606 if (isa<EnumConstantDecl>(RhsField)) { 1607 // The member expression points to an enum. 1608 return false; 1609 } 1610 1611 if (RhsField == LhsField) { 1612 // Initializing a field with itself. Throw a warning. 1613 // But wait; there are exceptions! 1614 // Exception #1: The field may not belong to this record. 1615 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1616 const Expr *base = ME->getBase(); 1617 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1618 // Even though the field matches, it does not belong to this record. 1619 return false; 1620 } 1621 // None of the exceptions triggered; return true to indicate an 1622 // uninitialized field was used. 1623 *L = ME->getMemberLoc(); 1624 return true; 1625 } 1626 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1627 // sizeof/alignof doesn't reference contents, do not warn. 1628 return false; 1629 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1630 // address-of doesn't reference contents (the pointer may be dereferenced 1631 // in the same expression but it would be rare; and weird). 1632 if (UOE->getOpcode() == UO_AddrOf) 1633 return false; 1634 } 1635 for (Stmt::const_child_range it = S->children(); it; ++it) { 1636 if (!*it) { 1637 // An expression such as 'member(arg ?: "")' may trigger this. 1638 continue; 1639 } 1640 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1641 return true; 1642 } 1643 return false; 1644} 1645 1646MemInitResult 1647Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1648 unsigned NumArgs, SourceLocation IdLoc, 1649 SourceLocation LParenLoc, 1650 SourceLocation RParenLoc) { 1651 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1652 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1653 assert((DirectMember || IndirectMember) && 1654 "Member must be a FieldDecl or IndirectFieldDecl"); 1655 1656 if (Member->isInvalidDecl()) 1657 return true; 1658 1659 // Diagnose value-uses of fields to initialize themselves, e.g. 1660 // foo(foo) 1661 // where foo is not also a parameter to the constructor. 1662 // TODO: implement -Wuninitialized and fold this into that framework. 1663 for (unsigned i = 0; i < NumArgs; ++i) { 1664 SourceLocation L; 1665 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1666 // FIXME: Return true in the case when other fields are used before being 1667 // uninitialized. For example, let this field be the i'th field. When 1668 // initializing the i'th field, throw a warning if any of the >= i'th 1669 // fields are used, as they are not yet initialized. 1670 // Right now we are only handling the case where the i'th field uses 1671 // itself in its initializer. 1672 Diag(L, diag::warn_field_is_uninit); 1673 } 1674 } 1675 1676 bool HasDependentArg = false; 1677 for (unsigned i = 0; i < NumArgs; i++) 1678 HasDependentArg |= Args[i]->isTypeDependent(); 1679 1680 Expr *Init; 1681 if (Member->getType()->isDependentType() || HasDependentArg) { 1682 // Can't check initialization for a member of dependent type or when 1683 // any of the arguments are type-dependent expressions. 1684 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1685 RParenLoc, 1686 Member->getType().getNonReferenceType()); 1687 1688 DiscardCleanupsInEvaluationContext(); 1689 } else { 1690 // Initialize the member. 1691 InitializedEntity MemberEntity = 1692 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1693 : InitializedEntity::InitializeMember(IndirectMember, 0); 1694 InitializationKind Kind = 1695 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1696 1697 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1698 1699 ExprResult MemberInit = 1700 InitSeq.Perform(*this, MemberEntity, Kind, 1701 MultiExprArg(*this, Args, NumArgs), 0); 1702 if (MemberInit.isInvalid()) 1703 return true; 1704 1705 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1706 1707 // C++0x [class.base.init]p7: 1708 // The initialization of each base and member constitutes a 1709 // full-expression. 1710 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1711 if (MemberInit.isInvalid()) 1712 return true; 1713 1714 // If we are in a dependent context, template instantiation will 1715 // perform this type-checking again. Just save the arguments that we 1716 // received in a ParenListExpr. 1717 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1718 // of the information that we have about the member 1719 // initializer. However, deconstructing the ASTs is a dicey process, 1720 // and this approach is far more likely to get the corner cases right. 1721 if (CurContext->isDependentContext()) { 1722 Init = new (Context) ParenListExpr( 1723 Context, LParenLoc, Args, NumArgs, RParenLoc, 1724 Member->getType().getNonReferenceType()); 1725 } else { 1726 Init = MemberInit.get(); 1727 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 1728 } 1729 } 1730 1731 if (DirectMember) { 1732 return new (Context) CXXCtorInitializer(Context, DirectMember, 1733 IdLoc, LParenLoc, Init, 1734 RParenLoc); 1735 } else { 1736 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1737 IdLoc, LParenLoc, Init, 1738 RParenLoc); 1739 } 1740} 1741 1742MemInitResult 1743Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1744 Expr **Args, unsigned NumArgs, 1745 SourceLocation NameLoc, 1746 SourceLocation LParenLoc, 1747 SourceLocation RParenLoc, 1748 CXXRecordDecl *ClassDecl) { 1749 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1750 if (!LangOpts.CPlusPlus0x) 1751 return Diag(Loc, diag::err_delegation_0x_only) 1752 << TInfo->getTypeLoc().getLocalSourceRange(); 1753 1754 // Initialize the object. 1755 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1756 QualType(ClassDecl->getTypeForDecl(), 0)); 1757 InitializationKind Kind = 1758 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1759 1760 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1761 1762 ExprResult DelegationInit = 1763 InitSeq.Perform(*this, DelegationEntity, Kind, 1764 MultiExprArg(*this, Args, NumArgs), 0); 1765 if (DelegationInit.isInvalid()) 1766 return true; 1767 1768 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1769 CXXConstructorDecl *Constructor 1770 = ConExpr->getConstructor(); 1771 assert(Constructor && "Delegating constructor with no target?"); 1772 1773 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1774 1775 // C++0x [class.base.init]p7: 1776 // The initialization of each base and member constitutes a 1777 // full-expression. 1778 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1779 if (DelegationInit.isInvalid()) 1780 return true; 1781 1782 assert(!CurContext->isDependentContext()); 1783 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1784 DelegationInit.takeAs<Expr>(), 1785 RParenLoc); 1786} 1787 1788MemInitResult 1789Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1790 Expr **Args, unsigned NumArgs, 1791 SourceLocation LParenLoc, SourceLocation RParenLoc, 1792 CXXRecordDecl *ClassDecl, 1793 SourceLocation EllipsisLoc) { 1794 bool HasDependentArg = false; 1795 for (unsigned i = 0; i < NumArgs; i++) 1796 HasDependentArg |= Args[i]->isTypeDependent(); 1797 1798 SourceLocation BaseLoc 1799 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1800 1801 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1802 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1803 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1804 1805 // C++ [class.base.init]p2: 1806 // [...] Unless the mem-initializer-id names a nonstatic data 1807 // member of the constructor's class or a direct or virtual base 1808 // of that class, the mem-initializer is ill-formed. A 1809 // mem-initializer-list can initialize a base class using any 1810 // name that denotes that base class type. 1811 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1812 1813 if (EllipsisLoc.isValid()) { 1814 // This is a pack expansion. 1815 if (!BaseType->containsUnexpandedParameterPack()) { 1816 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1817 << SourceRange(BaseLoc, RParenLoc); 1818 1819 EllipsisLoc = SourceLocation(); 1820 } 1821 } else { 1822 // Check for any unexpanded parameter packs. 1823 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1824 return true; 1825 1826 for (unsigned I = 0; I != NumArgs; ++I) 1827 if (DiagnoseUnexpandedParameterPack(Args[I])) 1828 return true; 1829 } 1830 1831 // Check for direct and virtual base classes. 1832 const CXXBaseSpecifier *DirectBaseSpec = 0; 1833 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1834 if (!Dependent) { 1835 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1836 BaseType)) 1837 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1838 LParenLoc, RParenLoc, ClassDecl); 1839 1840 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1841 VirtualBaseSpec); 1842 1843 // C++ [base.class.init]p2: 1844 // Unless the mem-initializer-id names a nonstatic data member of the 1845 // constructor's class or a direct or virtual base of that class, the 1846 // mem-initializer is ill-formed. 1847 if (!DirectBaseSpec && !VirtualBaseSpec) { 1848 // If the class has any dependent bases, then it's possible that 1849 // one of those types will resolve to the same type as 1850 // BaseType. Therefore, just treat this as a dependent base 1851 // class initialization. FIXME: Should we try to check the 1852 // initialization anyway? It seems odd. 1853 if (ClassDecl->hasAnyDependentBases()) 1854 Dependent = true; 1855 else 1856 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1857 << BaseType << Context.getTypeDeclType(ClassDecl) 1858 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1859 } 1860 } 1861 1862 if (Dependent) { 1863 // Can't check initialization for a base of dependent type or when 1864 // any of the arguments are type-dependent expressions. 1865 ExprResult BaseInit 1866 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1867 RParenLoc, BaseType)); 1868 1869 DiscardCleanupsInEvaluationContext(); 1870 1871 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1872 /*IsVirtual=*/false, 1873 LParenLoc, 1874 BaseInit.takeAs<Expr>(), 1875 RParenLoc, 1876 EllipsisLoc); 1877 } 1878 1879 // C++ [base.class.init]p2: 1880 // If a mem-initializer-id is ambiguous because it designates both 1881 // a direct non-virtual base class and an inherited virtual base 1882 // class, the mem-initializer is ill-formed. 1883 if (DirectBaseSpec && VirtualBaseSpec) 1884 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1885 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1886 1887 CXXBaseSpecifier *BaseSpec 1888 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1889 if (!BaseSpec) 1890 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1891 1892 // Initialize the base. 1893 InitializedEntity BaseEntity = 1894 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1895 InitializationKind Kind = 1896 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1897 1898 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1899 1900 ExprResult BaseInit = 1901 InitSeq.Perform(*this, BaseEntity, Kind, 1902 MultiExprArg(*this, Args, NumArgs), 0); 1903 if (BaseInit.isInvalid()) 1904 return true; 1905 1906 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1907 1908 // C++0x [class.base.init]p7: 1909 // The initialization of each base and member constitutes a 1910 // full-expression. 1911 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1912 if (BaseInit.isInvalid()) 1913 return true; 1914 1915 // If we are in a dependent context, template instantiation will 1916 // perform this type-checking again. Just save the arguments that we 1917 // received in a ParenListExpr. 1918 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1919 // of the information that we have about the base 1920 // initializer. However, deconstructing the ASTs is a dicey process, 1921 // and this approach is far more likely to get the corner cases right. 1922 if (CurContext->isDependentContext()) { 1923 ExprResult Init 1924 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1925 RParenLoc, BaseType)); 1926 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1927 BaseSpec->isVirtual(), 1928 LParenLoc, 1929 Init.takeAs<Expr>(), 1930 RParenLoc, 1931 EllipsisLoc); 1932 } 1933 1934 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1935 BaseSpec->isVirtual(), 1936 LParenLoc, 1937 BaseInit.takeAs<Expr>(), 1938 RParenLoc, 1939 EllipsisLoc); 1940} 1941 1942// Create a static_cast\<T&&>(expr). 1943static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 1944 QualType ExprType = E->getType(); 1945 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 1946 SourceLocation ExprLoc = E->getLocStart(); 1947 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 1948 TargetType, ExprLoc); 1949 1950 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 1951 SourceRange(ExprLoc, ExprLoc), 1952 E->getSourceRange()).take(); 1953} 1954 1955/// ImplicitInitializerKind - How an implicit base or member initializer should 1956/// initialize its base or member. 1957enum ImplicitInitializerKind { 1958 IIK_Default, 1959 IIK_Copy, 1960 IIK_Move 1961}; 1962 1963static bool 1964BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1965 ImplicitInitializerKind ImplicitInitKind, 1966 CXXBaseSpecifier *BaseSpec, 1967 bool IsInheritedVirtualBase, 1968 CXXCtorInitializer *&CXXBaseInit) { 1969 InitializedEntity InitEntity 1970 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1971 IsInheritedVirtualBase); 1972 1973 ExprResult BaseInit; 1974 1975 switch (ImplicitInitKind) { 1976 case IIK_Default: { 1977 InitializationKind InitKind 1978 = InitializationKind::CreateDefault(Constructor->getLocation()); 1979 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1980 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1981 MultiExprArg(SemaRef, 0, 0)); 1982 break; 1983 } 1984 1985 case IIK_Move: 1986 case IIK_Copy: { 1987 bool Moving = ImplicitInitKind == IIK_Move; 1988 ParmVarDecl *Param = Constructor->getParamDecl(0); 1989 QualType ParamType = Param->getType().getNonReferenceType(); 1990 1991 Expr *CopyCtorArg = 1992 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1993 Constructor->getLocation(), ParamType, 1994 VK_LValue, 0); 1995 1996 // Cast to the base class to avoid ambiguities. 1997 QualType ArgTy = 1998 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1999 ParamType.getQualifiers()); 2000 2001 if (Moving) { 2002 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2003 } 2004 2005 CXXCastPath BasePath; 2006 BasePath.push_back(BaseSpec); 2007 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2008 CK_UncheckedDerivedToBase, 2009 Moving ? VK_XValue : VK_LValue, 2010 &BasePath).take(); 2011 2012 InitializationKind InitKind 2013 = InitializationKind::CreateDirect(Constructor->getLocation(), 2014 SourceLocation(), SourceLocation()); 2015 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2016 &CopyCtorArg, 1); 2017 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2018 MultiExprArg(&CopyCtorArg, 1)); 2019 break; 2020 } 2021 } 2022 2023 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2024 if (BaseInit.isInvalid()) 2025 return true; 2026 2027 CXXBaseInit = 2028 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2029 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2030 SourceLocation()), 2031 BaseSpec->isVirtual(), 2032 SourceLocation(), 2033 BaseInit.takeAs<Expr>(), 2034 SourceLocation(), 2035 SourceLocation()); 2036 2037 return false; 2038} 2039 2040static bool RefersToRValueRef(Expr *MemRef) { 2041 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2042 return Referenced->getType()->isRValueReferenceType(); 2043} 2044 2045static bool 2046BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2047 ImplicitInitializerKind ImplicitInitKind, 2048 FieldDecl *Field, IndirectFieldDecl *Indirect, 2049 CXXCtorInitializer *&CXXMemberInit) { 2050 if (Field->isInvalidDecl()) 2051 return true; 2052 2053 SourceLocation Loc = Constructor->getLocation(); 2054 2055 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2056 bool Moving = ImplicitInitKind == IIK_Move; 2057 ParmVarDecl *Param = Constructor->getParamDecl(0); 2058 QualType ParamType = Param->getType().getNonReferenceType(); 2059 2060 // Suppress copying zero-width bitfields. 2061 if (const Expr *Width = Field->getBitWidth()) 2062 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 2063 return false; 2064 2065 Expr *MemberExprBase = 2066 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 2067 Loc, ParamType, VK_LValue, 0); 2068 2069 if (Moving) { 2070 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2071 } 2072 2073 // Build a reference to this field within the parameter. 2074 CXXScopeSpec SS; 2075 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2076 Sema::LookupMemberName); 2077 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2078 : cast<ValueDecl>(Field), AS_public); 2079 MemberLookup.resolveKind(); 2080 ExprResult CtorArg 2081 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2082 ParamType, Loc, 2083 /*IsArrow=*/false, 2084 SS, 2085 /*FirstQualifierInScope=*/0, 2086 MemberLookup, 2087 /*TemplateArgs=*/0); 2088 if (CtorArg.isInvalid()) 2089 return true; 2090 2091 // C++11 [class.copy]p15: 2092 // - if a member m has rvalue reference type T&&, it is direct-initialized 2093 // with static_cast<T&&>(x.m); 2094 if (RefersToRValueRef(CtorArg.get())) { 2095 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2096 } 2097 2098 // When the field we are copying is an array, create index variables for 2099 // each dimension of the array. We use these index variables to subscript 2100 // the source array, and other clients (e.g., CodeGen) will perform the 2101 // necessary iteration with these index variables. 2102 SmallVector<VarDecl *, 4> IndexVariables; 2103 QualType BaseType = Field->getType(); 2104 QualType SizeType = SemaRef.Context.getSizeType(); 2105 bool InitializingArray = false; 2106 while (const ConstantArrayType *Array 2107 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2108 InitializingArray = true; 2109 // Create the iteration variable for this array index. 2110 IdentifierInfo *IterationVarName = 0; 2111 { 2112 llvm::SmallString<8> Str; 2113 llvm::raw_svector_ostream OS(Str); 2114 OS << "__i" << IndexVariables.size(); 2115 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2116 } 2117 VarDecl *IterationVar 2118 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2119 IterationVarName, SizeType, 2120 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2121 SC_None, SC_None); 2122 IndexVariables.push_back(IterationVar); 2123 2124 // Create a reference to the iteration variable. 2125 ExprResult IterationVarRef 2126 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2127 assert(!IterationVarRef.isInvalid() && 2128 "Reference to invented variable cannot fail!"); 2129 2130 // Subscript the array with this iteration variable. 2131 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2132 IterationVarRef.take(), 2133 Loc); 2134 if (CtorArg.isInvalid()) 2135 return true; 2136 2137 BaseType = Array->getElementType(); 2138 } 2139 2140 // The array subscript expression is an lvalue, which is wrong for moving. 2141 if (Moving && InitializingArray) 2142 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2143 2144 // Construct the entity that we will be initializing. For an array, this 2145 // will be first element in the array, which may require several levels 2146 // of array-subscript entities. 2147 SmallVector<InitializedEntity, 4> Entities; 2148 Entities.reserve(1 + IndexVariables.size()); 2149 if (Indirect) 2150 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2151 else 2152 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2153 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2154 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2155 0, 2156 Entities.back())); 2157 2158 // Direct-initialize to use the copy constructor. 2159 InitializationKind InitKind = 2160 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2161 2162 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2163 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2164 &CtorArgE, 1); 2165 2166 ExprResult MemberInit 2167 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2168 MultiExprArg(&CtorArgE, 1)); 2169 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2170 if (MemberInit.isInvalid()) 2171 return true; 2172 2173 if (Indirect) { 2174 assert(IndexVariables.size() == 0 && 2175 "Indirect field improperly initialized"); 2176 CXXMemberInit 2177 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2178 Loc, Loc, 2179 MemberInit.takeAs<Expr>(), 2180 Loc); 2181 } else 2182 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2183 Loc, MemberInit.takeAs<Expr>(), 2184 Loc, 2185 IndexVariables.data(), 2186 IndexVariables.size()); 2187 return false; 2188 } 2189 2190 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2191 2192 QualType FieldBaseElementType = 2193 SemaRef.Context.getBaseElementType(Field->getType()); 2194 2195 if (FieldBaseElementType->isRecordType()) { 2196 InitializedEntity InitEntity 2197 = Indirect? InitializedEntity::InitializeMember(Indirect) 2198 : InitializedEntity::InitializeMember(Field); 2199 InitializationKind InitKind = 2200 InitializationKind::CreateDefault(Loc); 2201 2202 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2203 ExprResult MemberInit = 2204 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2205 2206 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2207 if (MemberInit.isInvalid()) 2208 return true; 2209 2210 if (Indirect) 2211 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2212 Indirect, Loc, 2213 Loc, 2214 MemberInit.get(), 2215 Loc); 2216 else 2217 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2218 Field, Loc, Loc, 2219 MemberInit.get(), 2220 Loc); 2221 return false; 2222 } 2223 2224 if (!Field->getParent()->isUnion()) { 2225 if (FieldBaseElementType->isReferenceType()) { 2226 SemaRef.Diag(Constructor->getLocation(), 2227 diag::err_uninitialized_member_in_ctor) 2228 << (int)Constructor->isImplicit() 2229 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2230 << 0 << Field->getDeclName(); 2231 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2232 return true; 2233 } 2234 2235 if (FieldBaseElementType.isConstQualified()) { 2236 SemaRef.Diag(Constructor->getLocation(), 2237 diag::err_uninitialized_member_in_ctor) 2238 << (int)Constructor->isImplicit() 2239 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2240 << 1 << Field->getDeclName(); 2241 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2242 return true; 2243 } 2244 } 2245 2246 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2247 FieldBaseElementType->isObjCRetainableType() && 2248 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2249 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2250 // Instant objects: 2251 // Default-initialize Objective-C pointers to NULL. 2252 CXXMemberInit 2253 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2254 Loc, Loc, 2255 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2256 Loc); 2257 return false; 2258 } 2259 2260 // Nothing to initialize. 2261 CXXMemberInit = 0; 2262 return false; 2263} 2264 2265namespace { 2266struct BaseAndFieldInfo { 2267 Sema &S; 2268 CXXConstructorDecl *Ctor; 2269 bool AnyErrorsInInits; 2270 ImplicitInitializerKind IIK; 2271 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2272 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2273 2274 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2275 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2276 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2277 if (Generated && Ctor->isCopyConstructor()) 2278 IIK = IIK_Copy; 2279 else if (Generated && Ctor->isMoveConstructor()) 2280 IIK = IIK_Move; 2281 else 2282 IIK = IIK_Default; 2283 } 2284}; 2285} 2286 2287/// \brief Determine whether the given indirect field declaration is somewhere 2288/// within an anonymous union. 2289static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2290 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2291 CEnd = F->chain_end(); 2292 C != CEnd; ++C) 2293 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2294 if (Record->isUnion()) 2295 return true; 2296 2297 return false; 2298} 2299 2300static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2301 FieldDecl *Field, 2302 IndirectFieldDecl *Indirect = 0) { 2303 2304 // Overwhelmingly common case: we have a direct initializer for this field. 2305 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2306 Info.AllToInit.push_back(Init); 2307 return false; 2308 } 2309 2310 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2311 // has a brace-or-equal-initializer, the entity is initialized as specified 2312 // in [dcl.init]. 2313 if (Field->hasInClassInitializer()) { 2314 CXXCtorInitializer *Init; 2315 if (Indirect) 2316 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2317 SourceLocation(), 2318 SourceLocation(), 0, 2319 SourceLocation()); 2320 else 2321 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2322 SourceLocation(), 2323 SourceLocation(), 0, 2324 SourceLocation()); 2325 Info.AllToInit.push_back(Init); 2326 return false; 2327 } 2328 2329 // Don't build an implicit initializer for union members if none was 2330 // explicitly specified. 2331 if (Field->getParent()->isUnion() || 2332 (Indirect && isWithinAnonymousUnion(Indirect))) 2333 return false; 2334 2335 // Don't try to build an implicit initializer if there were semantic 2336 // errors in any of the initializers (and therefore we might be 2337 // missing some that the user actually wrote). 2338 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2339 return false; 2340 2341 CXXCtorInitializer *Init = 0; 2342 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2343 Indirect, Init)) 2344 return true; 2345 2346 if (Init) 2347 Info.AllToInit.push_back(Init); 2348 2349 return false; 2350} 2351 2352bool 2353Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2354 CXXCtorInitializer *Initializer) { 2355 assert(Initializer->isDelegatingInitializer()); 2356 Constructor->setNumCtorInitializers(1); 2357 CXXCtorInitializer **initializer = 2358 new (Context) CXXCtorInitializer*[1]; 2359 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2360 Constructor->setCtorInitializers(initializer); 2361 2362 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2363 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2364 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2365 } 2366 2367 DelegatingCtorDecls.push_back(Constructor); 2368 2369 return false; 2370} 2371 2372bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2373 CXXCtorInitializer **Initializers, 2374 unsigned NumInitializers, 2375 bool AnyErrors) { 2376 if (Constructor->getDeclContext()->isDependentContext()) { 2377 // Just store the initializers as written, they will be checked during 2378 // instantiation. 2379 if (NumInitializers > 0) { 2380 Constructor->setNumCtorInitializers(NumInitializers); 2381 CXXCtorInitializer **baseOrMemberInitializers = 2382 new (Context) CXXCtorInitializer*[NumInitializers]; 2383 memcpy(baseOrMemberInitializers, Initializers, 2384 NumInitializers * sizeof(CXXCtorInitializer*)); 2385 Constructor->setCtorInitializers(baseOrMemberInitializers); 2386 } 2387 2388 return false; 2389 } 2390 2391 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2392 2393 // We need to build the initializer AST according to order of construction 2394 // and not what user specified in the Initializers list. 2395 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2396 if (!ClassDecl) 2397 return true; 2398 2399 bool HadError = false; 2400 2401 for (unsigned i = 0; i < NumInitializers; i++) { 2402 CXXCtorInitializer *Member = Initializers[i]; 2403 2404 if (Member->isBaseInitializer()) 2405 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2406 else 2407 Info.AllBaseFields[Member->getAnyMember()] = Member; 2408 } 2409 2410 // Keep track of the direct virtual bases. 2411 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2412 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2413 E = ClassDecl->bases_end(); I != E; ++I) { 2414 if (I->isVirtual()) 2415 DirectVBases.insert(I); 2416 } 2417 2418 // Push virtual bases before others. 2419 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2420 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2421 2422 if (CXXCtorInitializer *Value 2423 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2424 Info.AllToInit.push_back(Value); 2425 } else if (!AnyErrors) { 2426 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2427 CXXCtorInitializer *CXXBaseInit; 2428 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2429 VBase, IsInheritedVirtualBase, 2430 CXXBaseInit)) { 2431 HadError = true; 2432 continue; 2433 } 2434 2435 Info.AllToInit.push_back(CXXBaseInit); 2436 } 2437 } 2438 2439 // Non-virtual bases. 2440 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2441 E = ClassDecl->bases_end(); Base != E; ++Base) { 2442 // Virtuals are in the virtual base list and already constructed. 2443 if (Base->isVirtual()) 2444 continue; 2445 2446 if (CXXCtorInitializer *Value 2447 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2448 Info.AllToInit.push_back(Value); 2449 } else if (!AnyErrors) { 2450 CXXCtorInitializer *CXXBaseInit; 2451 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2452 Base, /*IsInheritedVirtualBase=*/false, 2453 CXXBaseInit)) { 2454 HadError = true; 2455 continue; 2456 } 2457 2458 Info.AllToInit.push_back(CXXBaseInit); 2459 } 2460 } 2461 2462 // Fields. 2463 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2464 MemEnd = ClassDecl->decls_end(); 2465 Mem != MemEnd; ++Mem) { 2466 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2467 if (F->getType()->isIncompleteArrayType()) { 2468 assert(ClassDecl->hasFlexibleArrayMember() && 2469 "Incomplete array type is not valid"); 2470 continue; 2471 } 2472 2473 // If we're not generating the implicit copy/move constructor, then we'll 2474 // handle anonymous struct/union fields based on their individual 2475 // indirect fields. 2476 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2477 continue; 2478 2479 if (CollectFieldInitializer(*this, Info, F)) 2480 HadError = true; 2481 continue; 2482 } 2483 2484 // Beyond this point, we only consider default initialization. 2485 if (Info.IIK != IIK_Default) 2486 continue; 2487 2488 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2489 if (F->getType()->isIncompleteArrayType()) { 2490 assert(ClassDecl->hasFlexibleArrayMember() && 2491 "Incomplete array type is not valid"); 2492 continue; 2493 } 2494 2495 // Initialize each field of an anonymous struct individually. 2496 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2497 HadError = true; 2498 2499 continue; 2500 } 2501 } 2502 2503 NumInitializers = Info.AllToInit.size(); 2504 if (NumInitializers > 0) { 2505 Constructor->setNumCtorInitializers(NumInitializers); 2506 CXXCtorInitializer **baseOrMemberInitializers = 2507 new (Context) CXXCtorInitializer*[NumInitializers]; 2508 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2509 NumInitializers * sizeof(CXXCtorInitializer*)); 2510 Constructor->setCtorInitializers(baseOrMemberInitializers); 2511 2512 // Constructors implicitly reference the base and member 2513 // destructors. 2514 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2515 Constructor->getParent()); 2516 } 2517 2518 return HadError; 2519} 2520 2521static void *GetKeyForTopLevelField(FieldDecl *Field) { 2522 // For anonymous unions, use the class declaration as the key. 2523 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2524 if (RT->getDecl()->isAnonymousStructOrUnion()) 2525 return static_cast<void *>(RT->getDecl()); 2526 } 2527 return static_cast<void *>(Field); 2528} 2529 2530static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2531 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2532} 2533 2534static void *GetKeyForMember(ASTContext &Context, 2535 CXXCtorInitializer *Member) { 2536 if (!Member->isAnyMemberInitializer()) 2537 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2538 2539 // For fields injected into the class via declaration of an anonymous union, 2540 // use its anonymous union class declaration as the unique key. 2541 FieldDecl *Field = Member->getAnyMember(); 2542 2543 // If the field is a member of an anonymous struct or union, our key 2544 // is the anonymous record decl that's a direct child of the class. 2545 RecordDecl *RD = Field->getParent(); 2546 if (RD->isAnonymousStructOrUnion()) { 2547 while (true) { 2548 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2549 if (Parent->isAnonymousStructOrUnion()) 2550 RD = Parent; 2551 else 2552 break; 2553 } 2554 2555 return static_cast<void *>(RD); 2556 } 2557 2558 return static_cast<void *>(Field); 2559} 2560 2561static void 2562DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2563 const CXXConstructorDecl *Constructor, 2564 CXXCtorInitializer **Inits, 2565 unsigned NumInits) { 2566 if (Constructor->getDeclContext()->isDependentContext()) 2567 return; 2568 2569 // Don't check initializers order unless the warning is enabled at the 2570 // location of at least one initializer. 2571 bool ShouldCheckOrder = false; 2572 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2573 CXXCtorInitializer *Init = Inits[InitIndex]; 2574 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2575 Init->getSourceLocation()) 2576 != Diagnostic::Ignored) { 2577 ShouldCheckOrder = true; 2578 break; 2579 } 2580 } 2581 if (!ShouldCheckOrder) 2582 return; 2583 2584 // Build the list of bases and members in the order that they'll 2585 // actually be initialized. The explicit initializers should be in 2586 // this same order but may be missing things. 2587 SmallVector<const void*, 32> IdealInitKeys; 2588 2589 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2590 2591 // 1. Virtual bases. 2592 for (CXXRecordDecl::base_class_const_iterator VBase = 2593 ClassDecl->vbases_begin(), 2594 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2595 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2596 2597 // 2. Non-virtual bases. 2598 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2599 E = ClassDecl->bases_end(); Base != E; ++Base) { 2600 if (Base->isVirtual()) 2601 continue; 2602 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2603 } 2604 2605 // 3. Direct fields. 2606 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2607 E = ClassDecl->field_end(); Field != E; ++Field) 2608 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2609 2610 unsigned NumIdealInits = IdealInitKeys.size(); 2611 unsigned IdealIndex = 0; 2612 2613 CXXCtorInitializer *PrevInit = 0; 2614 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2615 CXXCtorInitializer *Init = Inits[InitIndex]; 2616 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2617 2618 // Scan forward to try to find this initializer in the idealized 2619 // initializers list. 2620 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2621 if (InitKey == IdealInitKeys[IdealIndex]) 2622 break; 2623 2624 // If we didn't find this initializer, it must be because we 2625 // scanned past it on a previous iteration. That can only 2626 // happen if we're out of order; emit a warning. 2627 if (IdealIndex == NumIdealInits && PrevInit) { 2628 Sema::SemaDiagnosticBuilder D = 2629 SemaRef.Diag(PrevInit->getSourceLocation(), 2630 diag::warn_initializer_out_of_order); 2631 2632 if (PrevInit->isAnyMemberInitializer()) 2633 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2634 else 2635 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2636 2637 if (Init->isAnyMemberInitializer()) 2638 D << 0 << Init->getAnyMember()->getDeclName(); 2639 else 2640 D << 1 << Init->getBaseClassInfo()->getType(); 2641 2642 // Move back to the initializer's location in the ideal list. 2643 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2644 if (InitKey == IdealInitKeys[IdealIndex]) 2645 break; 2646 2647 assert(IdealIndex != NumIdealInits && 2648 "initializer not found in initializer list"); 2649 } 2650 2651 PrevInit = Init; 2652 } 2653} 2654 2655namespace { 2656bool CheckRedundantInit(Sema &S, 2657 CXXCtorInitializer *Init, 2658 CXXCtorInitializer *&PrevInit) { 2659 if (!PrevInit) { 2660 PrevInit = Init; 2661 return false; 2662 } 2663 2664 if (FieldDecl *Field = Init->getMember()) 2665 S.Diag(Init->getSourceLocation(), 2666 diag::err_multiple_mem_initialization) 2667 << Field->getDeclName() 2668 << Init->getSourceRange(); 2669 else { 2670 const Type *BaseClass = Init->getBaseClass(); 2671 assert(BaseClass && "neither field nor base"); 2672 S.Diag(Init->getSourceLocation(), 2673 diag::err_multiple_base_initialization) 2674 << QualType(BaseClass, 0) 2675 << Init->getSourceRange(); 2676 } 2677 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2678 << 0 << PrevInit->getSourceRange(); 2679 2680 return true; 2681} 2682 2683typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2684typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2685 2686bool CheckRedundantUnionInit(Sema &S, 2687 CXXCtorInitializer *Init, 2688 RedundantUnionMap &Unions) { 2689 FieldDecl *Field = Init->getAnyMember(); 2690 RecordDecl *Parent = Field->getParent(); 2691 if (!Parent->isAnonymousStructOrUnion()) 2692 return false; 2693 2694 NamedDecl *Child = Field; 2695 do { 2696 if (Parent->isUnion()) { 2697 UnionEntry &En = Unions[Parent]; 2698 if (En.first && En.first != Child) { 2699 S.Diag(Init->getSourceLocation(), 2700 diag::err_multiple_mem_union_initialization) 2701 << Field->getDeclName() 2702 << Init->getSourceRange(); 2703 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2704 << 0 << En.second->getSourceRange(); 2705 return true; 2706 } else if (!En.first) { 2707 En.first = Child; 2708 En.second = Init; 2709 } 2710 } 2711 2712 Child = Parent; 2713 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2714 } while (Parent->isAnonymousStructOrUnion()); 2715 2716 return false; 2717} 2718} 2719 2720/// ActOnMemInitializers - Handle the member initializers for a constructor. 2721void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2722 SourceLocation ColonLoc, 2723 CXXCtorInitializer **meminits, 2724 unsigned NumMemInits, 2725 bool AnyErrors) { 2726 if (!ConstructorDecl) 2727 return; 2728 2729 AdjustDeclIfTemplate(ConstructorDecl); 2730 2731 CXXConstructorDecl *Constructor 2732 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2733 2734 if (!Constructor) { 2735 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2736 return; 2737 } 2738 2739 CXXCtorInitializer **MemInits = 2740 reinterpret_cast<CXXCtorInitializer **>(meminits); 2741 2742 // Mapping for the duplicate initializers check. 2743 // For member initializers, this is keyed with a FieldDecl*. 2744 // For base initializers, this is keyed with a Type*. 2745 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2746 2747 // Mapping for the inconsistent anonymous-union initializers check. 2748 RedundantUnionMap MemberUnions; 2749 2750 bool HadError = false; 2751 for (unsigned i = 0; i < NumMemInits; i++) { 2752 CXXCtorInitializer *Init = MemInits[i]; 2753 2754 // Set the source order index. 2755 Init->setSourceOrder(i); 2756 2757 if (Init->isAnyMemberInitializer()) { 2758 FieldDecl *Field = Init->getAnyMember(); 2759 if (CheckRedundantInit(*this, Init, Members[Field]) || 2760 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2761 HadError = true; 2762 } else if (Init->isBaseInitializer()) { 2763 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2764 if (CheckRedundantInit(*this, Init, Members[Key])) 2765 HadError = true; 2766 } else { 2767 assert(Init->isDelegatingInitializer()); 2768 // This must be the only initializer 2769 if (i != 0 || NumMemInits > 1) { 2770 Diag(MemInits[0]->getSourceLocation(), 2771 diag::err_delegating_initializer_alone) 2772 << MemInits[0]->getSourceRange(); 2773 HadError = true; 2774 // We will treat this as being the only initializer. 2775 } 2776 SetDelegatingInitializer(Constructor, MemInits[i]); 2777 // Return immediately as the initializer is set. 2778 return; 2779 } 2780 } 2781 2782 if (HadError) 2783 return; 2784 2785 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2786 2787 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2788} 2789 2790void 2791Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2792 CXXRecordDecl *ClassDecl) { 2793 // Ignore dependent contexts. Also ignore unions, since their members never 2794 // have destructors implicitly called. 2795 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 2796 return; 2797 2798 // FIXME: all the access-control diagnostics are positioned on the 2799 // field/base declaration. That's probably good; that said, the 2800 // user might reasonably want to know why the destructor is being 2801 // emitted, and we currently don't say. 2802 2803 // Non-static data members. 2804 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2805 E = ClassDecl->field_end(); I != E; ++I) { 2806 FieldDecl *Field = *I; 2807 if (Field->isInvalidDecl()) 2808 continue; 2809 QualType FieldType = Context.getBaseElementType(Field->getType()); 2810 2811 const RecordType* RT = FieldType->getAs<RecordType>(); 2812 if (!RT) 2813 continue; 2814 2815 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2816 if (FieldClassDecl->isInvalidDecl()) 2817 continue; 2818 if (FieldClassDecl->hasTrivialDestructor()) 2819 continue; 2820 2821 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2822 assert(Dtor && "No dtor found for FieldClassDecl!"); 2823 CheckDestructorAccess(Field->getLocation(), Dtor, 2824 PDiag(diag::err_access_dtor_field) 2825 << Field->getDeclName() 2826 << FieldType); 2827 2828 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2829 } 2830 2831 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2832 2833 // Bases. 2834 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2835 E = ClassDecl->bases_end(); Base != E; ++Base) { 2836 // Bases are always records in a well-formed non-dependent class. 2837 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2838 2839 // Remember direct virtual bases. 2840 if (Base->isVirtual()) 2841 DirectVirtualBases.insert(RT); 2842 2843 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2844 // If our base class is invalid, we probably can't get its dtor anyway. 2845 if (BaseClassDecl->isInvalidDecl()) 2846 continue; 2847 // Ignore trivial destructors. 2848 if (BaseClassDecl->hasTrivialDestructor()) 2849 continue; 2850 2851 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2852 assert(Dtor && "No dtor found for BaseClassDecl!"); 2853 2854 // FIXME: caret should be on the start of the class name 2855 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2856 PDiag(diag::err_access_dtor_base) 2857 << Base->getType() 2858 << Base->getSourceRange()); 2859 2860 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2861 } 2862 2863 // Virtual bases. 2864 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2865 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2866 2867 // Bases are always records in a well-formed non-dependent class. 2868 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2869 2870 // Ignore direct virtual bases. 2871 if (DirectVirtualBases.count(RT)) 2872 continue; 2873 2874 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2875 // If our base class is invalid, we probably can't get its dtor anyway. 2876 if (BaseClassDecl->isInvalidDecl()) 2877 continue; 2878 // Ignore trivial destructors. 2879 if (BaseClassDecl->hasTrivialDestructor()) 2880 continue; 2881 2882 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2883 assert(Dtor && "No dtor found for BaseClassDecl!"); 2884 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2885 PDiag(diag::err_access_dtor_vbase) 2886 << VBase->getType()); 2887 2888 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2889 } 2890} 2891 2892void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2893 if (!CDtorDecl) 2894 return; 2895 2896 if (CXXConstructorDecl *Constructor 2897 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2898 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2899} 2900 2901bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2902 unsigned DiagID, AbstractDiagSelID SelID) { 2903 if (SelID == -1) 2904 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2905 else 2906 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2907} 2908 2909bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2910 const PartialDiagnostic &PD) { 2911 if (!getLangOptions().CPlusPlus) 2912 return false; 2913 2914 if (const ArrayType *AT = Context.getAsArrayType(T)) 2915 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2916 2917 if (const PointerType *PT = T->getAs<PointerType>()) { 2918 // Find the innermost pointer type. 2919 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2920 PT = T; 2921 2922 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2923 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2924 } 2925 2926 const RecordType *RT = T->getAs<RecordType>(); 2927 if (!RT) 2928 return false; 2929 2930 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2931 2932 // We can't answer whether something is abstract until it has a 2933 // definition. If it's currently being defined, we'll walk back 2934 // over all the declarations when we have a full definition. 2935 const CXXRecordDecl *Def = RD->getDefinition(); 2936 if (!Def || Def->isBeingDefined()) 2937 return false; 2938 2939 if (!RD->isAbstract()) 2940 return false; 2941 2942 Diag(Loc, PD) << RD->getDeclName(); 2943 DiagnoseAbstractType(RD); 2944 2945 return true; 2946} 2947 2948void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2949 // Check if we've already emitted the list of pure virtual functions 2950 // for this class. 2951 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2952 return; 2953 2954 CXXFinalOverriderMap FinalOverriders; 2955 RD->getFinalOverriders(FinalOverriders); 2956 2957 // Keep a set of seen pure methods so we won't diagnose the same method 2958 // more than once. 2959 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2960 2961 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2962 MEnd = FinalOverriders.end(); 2963 M != MEnd; 2964 ++M) { 2965 for (OverridingMethods::iterator SO = M->second.begin(), 2966 SOEnd = M->second.end(); 2967 SO != SOEnd; ++SO) { 2968 // C++ [class.abstract]p4: 2969 // A class is abstract if it contains or inherits at least one 2970 // pure virtual function for which the final overrider is pure 2971 // virtual. 2972 2973 // 2974 if (SO->second.size() != 1) 2975 continue; 2976 2977 if (!SO->second.front().Method->isPure()) 2978 continue; 2979 2980 if (!SeenPureMethods.insert(SO->second.front().Method)) 2981 continue; 2982 2983 Diag(SO->second.front().Method->getLocation(), 2984 diag::note_pure_virtual_function) 2985 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2986 } 2987 } 2988 2989 if (!PureVirtualClassDiagSet) 2990 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2991 PureVirtualClassDiagSet->insert(RD); 2992} 2993 2994namespace { 2995struct AbstractUsageInfo { 2996 Sema &S; 2997 CXXRecordDecl *Record; 2998 CanQualType AbstractType; 2999 bool Invalid; 3000 3001 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3002 : S(S), Record(Record), 3003 AbstractType(S.Context.getCanonicalType( 3004 S.Context.getTypeDeclType(Record))), 3005 Invalid(false) {} 3006 3007 void DiagnoseAbstractType() { 3008 if (Invalid) return; 3009 S.DiagnoseAbstractType(Record); 3010 Invalid = true; 3011 } 3012 3013 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3014}; 3015 3016struct CheckAbstractUsage { 3017 AbstractUsageInfo &Info; 3018 const NamedDecl *Ctx; 3019 3020 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3021 : Info(Info), Ctx(Ctx) {} 3022 3023 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3024 switch (TL.getTypeLocClass()) { 3025#define ABSTRACT_TYPELOC(CLASS, PARENT) 3026#define TYPELOC(CLASS, PARENT) \ 3027 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3028#include "clang/AST/TypeLocNodes.def" 3029 } 3030 } 3031 3032 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3033 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3034 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3035 if (!TL.getArg(I)) 3036 continue; 3037 3038 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3039 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3040 } 3041 } 3042 3043 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3044 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3045 } 3046 3047 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3048 // Visit the type parameters from a permissive context. 3049 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3050 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3051 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3052 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3053 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3054 // TODO: other template argument types? 3055 } 3056 } 3057 3058 // Visit pointee types from a permissive context. 3059#define CheckPolymorphic(Type) \ 3060 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3061 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3062 } 3063 CheckPolymorphic(PointerTypeLoc) 3064 CheckPolymorphic(ReferenceTypeLoc) 3065 CheckPolymorphic(MemberPointerTypeLoc) 3066 CheckPolymorphic(BlockPointerTypeLoc) 3067 3068 /// Handle all the types we haven't given a more specific 3069 /// implementation for above. 3070 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3071 // Every other kind of type that we haven't called out already 3072 // that has an inner type is either (1) sugar or (2) contains that 3073 // inner type in some way as a subobject. 3074 if (TypeLoc Next = TL.getNextTypeLoc()) 3075 return Visit(Next, Sel); 3076 3077 // If there's no inner type and we're in a permissive context, 3078 // don't diagnose. 3079 if (Sel == Sema::AbstractNone) return; 3080 3081 // Check whether the type matches the abstract type. 3082 QualType T = TL.getType(); 3083 if (T->isArrayType()) { 3084 Sel = Sema::AbstractArrayType; 3085 T = Info.S.Context.getBaseElementType(T); 3086 } 3087 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3088 if (CT != Info.AbstractType) return; 3089 3090 // It matched; do some magic. 3091 if (Sel == Sema::AbstractArrayType) { 3092 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3093 << T << TL.getSourceRange(); 3094 } else { 3095 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3096 << Sel << T << TL.getSourceRange(); 3097 } 3098 Info.DiagnoseAbstractType(); 3099 } 3100}; 3101 3102void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3103 Sema::AbstractDiagSelID Sel) { 3104 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3105} 3106 3107} 3108 3109/// Check for invalid uses of an abstract type in a method declaration. 3110static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3111 CXXMethodDecl *MD) { 3112 // No need to do the check on definitions, which require that 3113 // the return/param types be complete. 3114 if (MD->doesThisDeclarationHaveABody()) 3115 return; 3116 3117 // For safety's sake, just ignore it if we don't have type source 3118 // information. This should never happen for non-implicit methods, 3119 // but... 3120 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3121 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3122} 3123 3124/// Check for invalid uses of an abstract type within a class definition. 3125static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3126 CXXRecordDecl *RD) { 3127 for (CXXRecordDecl::decl_iterator 3128 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3129 Decl *D = *I; 3130 if (D->isImplicit()) continue; 3131 3132 // Methods and method templates. 3133 if (isa<CXXMethodDecl>(D)) { 3134 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3135 } else if (isa<FunctionTemplateDecl>(D)) { 3136 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3137 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3138 3139 // Fields and static variables. 3140 } else if (isa<FieldDecl>(D)) { 3141 FieldDecl *FD = cast<FieldDecl>(D); 3142 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3143 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3144 } else if (isa<VarDecl>(D)) { 3145 VarDecl *VD = cast<VarDecl>(D); 3146 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3147 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3148 3149 // Nested classes and class templates. 3150 } else if (isa<CXXRecordDecl>(D)) { 3151 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3152 } else if (isa<ClassTemplateDecl>(D)) { 3153 CheckAbstractClassUsage(Info, 3154 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3155 } 3156 } 3157} 3158 3159/// \brief Perform semantic checks on a class definition that has been 3160/// completing, introducing implicitly-declared members, checking for 3161/// abstract types, etc. 3162void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3163 if (!Record) 3164 return; 3165 3166 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3167 AbstractUsageInfo Info(*this, Record); 3168 CheckAbstractClassUsage(Info, Record); 3169 } 3170 3171 // If this is not an aggregate type and has no user-declared constructor, 3172 // complain about any non-static data members of reference or const scalar 3173 // type, since they will never get initializers. 3174 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3175 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3176 bool Complained = false; 3177 for (RecordDecl::field_iterator F = Record->field_begin(), 3178 FEnd = Record->field_end(); 3179 F != FEnd; ++F) { 3180 if (F->hasInClassInitializer()) 3181 continue; 3182 3183 if (F->getType()->isReferenceType() || 3184 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3185 if (!Complained) { 3186 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3187 << Record->getTagKind() << Record; 3188 Complained = true; 3189 } 3190 3191 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3192 << F->getType()->isReferenceType() 3193 << F->getDeclName(); 3194 } 3195 } 3196 } 3197 3198 if (Record->isDynamicClass() && !Record->isDependentType()) 3199 DynamicClasses.push_back(Record); 3200 3201 if (Record->getIdentifier()) { 3202 // C++ [class.mem]p13: 3203 // If T is the name of a class, then each of the following shall have a 3204 // name different from T: 3205 // - every member of every anonymous union that is a member of class T. 3206 // 3207 // C++ [class.mem]p14: 3208 // In addition, if class T has a user-declared constructor (12.1), every 3209 // non-static data member of class T shall have a name different from T. 3210 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3211 R.first != R.second; ++R.first) { 3212 NamedDecl *D = *R.first; 3213 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3214 isa<IndirectFieldDecl>(D)) { 3215 Diag(D->getLocation(), diag::err_member_name_of_class) 3216 << D->getDeclName(); 3217 break; 3218 } 3219 } 3220 } 3221 3222 // Warn if the class has virtual methods but non-virtual public destructor. 3223 if (Record->isPolymorphic() && !Record->isDependentType()) { 3224 CXXDestructorDecl *dtor = Record->getDestructor(); 3225 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3226 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3227 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3228 } 3229 3230 // See if a method overloads virtual methods in a base 3231 /// class without overriding any. 3232 if (!Record->isDependentType()) { 3233 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3234 MEnd = Record->method_end(); 3235 M != MEnd; ++M) { 3236 if (!(*M)->isStatic()) 3237 DiagnoseHiddenVirtualMethods(Record, *M); 3238 } 3239 } 3240 3241 // Declare inherited constructors. We do this eagerly here because: 3242 // - The standard requires an eager diagnostic for conflicting inherited 3243 // constructors from different classes. 3244 // - The lazy declaration of the other implicit constructors is so as to not 3245 // waste space and performance on classes that are not meant to be 3246 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3247 // have inherited constructors. 3248 DeclareInheritedConstructors(Record); 3249 3250 if (!Record->isDependentType()) 3251 CheckExplicitlyDefaultedMethods(Record); 3252} 3253 3254void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3255 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3256 ME = Record->method_end(); 3257 MI != ME; ++MI) { 3258 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3259 switch (getSpecialMember(*MI)) { 3260 case CXXDefaultConstructor: 3261 CheckExplicitlyDefaultedDefaultConstructor( 3262 cast<CXXConstructorDecl>(*MI)); 3263 break; 3264 3265 case CXXDestructor: 3266 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3267 break; 3268 3269 case CXXCopyConstructor: 3270 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3271 break; 3272 3273 case CXXCopyAssignment: 3274 CheckExplicitlyDefaultedCopyAssignment(*MI); 3275 break; 3276 3277 case CXXMoveConstructor: 3278 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3279 break; 3280 3281 case CXXMoveAssignment: 3282 CheckExplicitlyDefaultedMoveAssignment(*MI); 3283 break; 3284 3285 case CXXInvalid: 3286 llvm_unreachable("non-special member explicitly defaulted!"); 3287 } 3288 } 3289 } 3290 3291} 3292 3293void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3294 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3295 3296 // Whether this was the first-declared instance of the constructor. 3297 // This affects whether we implicitly add an exception spec (and, eventually, 3298 // constexpr). It is also ill-formed to explicitly default a constructor such 3299 // that it would be deleted. (C++0x [decl.fct.def.default]) 3300 bool First = CD == CD->getCanonicalDecl(); 3301 3302 bool HadError = false; 3303 if (CD->getNumParams() != 0) { 3304 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3305 << CD->getSourceRange(); 3306 HadError = true; 3307 } 3308 3309 ImplicitExceptionSpecification Spec 3310 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3311 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3312 if (EPI.ExceptionSpecType == EST_Delayed) { 3313 // Exception specification depends on some deferred part of the class. We'll 3314 // try again when the class's definition has been fully processed. 3315 return; 3316 } 3317 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3318 *ExceptionType = Context.getFunctionType( 3319 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3320 3321 if (CtorType->hasExceptionSpec()) { 3322 if (CheckEquivalentExceptionSpec( 3323 PDiag(diag::err_incorrect_defaulted_exception_spec) 3324 << CXXDefaultConstructor, 3325 PDiag(), 3326 ExceptionType, SourceLocation(), 3327 CtorType, CD->getLocation())) { 3328 HadError = true; 3329 } 3330 } else if (First) { 3331 // We set the declaration to have the computed exception spec here. 3332 // We know there are no parameters. 3333 EPI.ExtInfo = CtorType->getExtInfo(); 3334 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3335 } 3336 3337 if (HadError) { 3338 CD->setInvalidDecl(); 3339 return; 3340 } 3341 3342 if (ShouldDeleteDefaultConstructor(CD)) { 3343 if (First) { 3344 CD->setDeletedAsWritten(); 3345 } else { 3346 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3347 << CXXDefaultConstructor; 3348 CD->setInvalidDecl(); 3349 } 3350 } 3351} 3352 3353void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3354 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3355 3356 // Whether this was the first-declared instance of the constructor. 3357 bool First = CD == CD->getCanonicalDecl(); 3358 3359 bool HadError = false; 3360 if (CD->getNumParams() != 1) { 3361 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3362 << CD->getSourceRange(); 3363 HadError = true; 3364 } 3365 3366 ImplicitExceptionSpecification Spec(Context); 3367 bool Const; 3368 llvm::tie(Spec, Const) = 3369 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3370 3371 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3372 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3373 *ExceptionType = Context.getFunctionType( 3374 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3375 3376 // Check for parameter type matching. 3377 // This is a copy ctor so we know it's a cv-qualified reference to T. 3378 QualType ArgType = CtorType->getArgType(0); 3379 if (ArgType->getPointeeType().isVolatileQualified()) { 3380 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3381 HadError = true; 3382 } 3383 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3384 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3385 HadError = true; 3386 } 3387 3388 if (CtorType->hasExceptionSpec()) { 3389 if (CheckEquivalentExceptionSpec( 3390 PDiag(diag::err_incorrect_defaulted_exception_spec) 3391 << CXXCopyConstructor, 3392 PDiag(), 3393 ExceptionType, SourceLocation(), 3394 CtorType, CD->getLocation())) { 3395 HadError = true; 3396 } 3397 } else if (First) { 3398 // We set the declaration to have the computed exception spec here. 3399 // We duplicate the one parameter type. 3400 EPI.ExtInfo = CtorType->getExtInfo(); 3401 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3402 } 3403 3404 if (HadError) { 3405 CD->setInvalidDecl(); 3406 return; 3407 } 3408 3409 if (ShouldDeleteCopyConstructor(CD)) { 3410 if (First) { 3411 CD->setDeletedAsWritten(); 3412 } else { 3413 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3414 << CXXCopyConstructor; 3415 CD->setInvalidDecl(); 3416 } 3417 } 3418} 3419 3420void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3421 assert(MD->isExplicitlyDefaulted()); 3422 3423 // Whether this was the first-declared instance of the operator 3424 bool First = MD == MD->getCanonicalDecl(); 3425 3426 bool HadError = false; 3427 if (MD->getNumParams() != 1) { 3428 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3429 << MD->getSourceRange(); 3430 HadError = true; 3431 } 3432 3433 QualType ReturnType = 3434 MD->getType()->getAs<FunctionType>()->getResultType(); 3435 if (!ReturnType->isLValueReferenceType() || 3436 !Context.hasSameType( 3437 Context.getCanonicalType(ReturnType->getPointeeType()), 3438 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3439 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3440 HadError = true; 3441 } 3442 3443 ImplicitExceptionSpecification Spec(Context); 3444 bool Const; 3445 llvm::tie(Spec, Const) = 3446 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3447 3448 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3449 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3450 *ExceptionType = Context.getFunctionType( 3451 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3452 3453 QualType ArgType = OperType->getArgType(0); 3454 if (!ArgType->isLValueReferenceType()) { 3455 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3456 HadError = true; 3457 } else { 3458 if (ArgType->getPointeeType().isVolatileQualified()) { 3459 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3460 HadError = true; 3461 } 3462 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3463 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3464 HadError = true; 3465 } 3466 } 3467 3468 if (OperType->getTypeQuals()) { 3469 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3470 HadError = true; 3471 } 3472 3473 if (OperType->hasExceptionSpec()) { 3474 if (CheckEquivalentExceptionSpec( 3475 PDiag(diag::err_incorrect_defaulted_exception_spec) 3476 << CXXCopyAssignment, 3477 PDiag(), 3478 ExceptionType, SourceLocation(), 3479 OperType, MD->getLocation())) { 3480 HadError = true; 3481 } 3482 } else if (First) { 3483 // We set the declaration to have the computed exception spec here. 3484 // We duplicate the one parameter type. 3485 EPI.RefQualifier = OperType->getRefQualifier(); 3486 EPI.ExtInfo = OperType->getExtInfo(); 3487 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3488 } 3489 3490 if (HadError) { 3491 MD->setInvalidDecl(); 3492 return; 3493 } 3494 3495 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3496 if (First) { 3497 MD->setDeletedAsWritten(); 3498 } else { 3499 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3500 << CXXCopyAssignment; 3501 MD->setInvalidDecl(); 3502 } 3503 } 3504} 3505 3506void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 3507 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 3508 3509 // Whether this was the first-declared instance of the constructor. 3510 bool First = CD == CD->getCanonicalDecl(); 3511 3512 bool HadError = false; 3513 if (CD->getNumParams() != 1) { 3514 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 3515 << CD->getSourceRange(); 3516 HadError = true; 3517 } 3518 3519 ImplicitExceptionSpecification Spec( 3520 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 3521 3522 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3523 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3524 *ExceptionType = Context.getFunctionType( 3525 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3526 3527 // Check for parameter type matching. 3528 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 3529 QualType ArgType = CtorType->getArgType(0); 3530 if (ArgType->getPointeeType().isVolatileQualified()) { 3531 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 3532 HadError = true; 3533 } 3534 if (ArgType->getPointeeType().isConstQualified()) { 3535 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 3536 HadError = true; 3537 } 3538 3539 if (CtorType->hasExceptionSpec()) { 3540 if (CheckEquivalentExceptionSpec( 3541 PDiag(diag::err_incorrect_defaulted_exception_spec) 3542 << CXXMoveConstructor, 3543 PDiag(), 3544 ExceptionType, SourceLocation(), 3545 CtorType, CD->getLocation())) { 3546 HadError = true; 3547 } 3548 } else if (First) { 3549 // We set the declaration to have the computed exception spec here. 3550 // We duplicate the one parameter type. 3551 EPI.ExtInfo = CtorType->getExtInfo(); 3552 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3553 } 3554 3555 if (HadError) { 3556 CD->setInvalidDecl(); 3557 return; 3558 } 3559 3560 if (ShouldDeleteMoveConstructor(CD)) { 3561 if (First) { 3562 CD->setDeletedAsWritten(); 3563 } else { 3564 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3565 << CXXMoveConstructor; 3566 CD->setInvalidDecl(); 3567 } 3568 } 3569} 3570 3571void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 3572 assert(MD->isExplicitlyDefaulted()); 3573 3574 // Whether this was the first-declared instance of the operator 3575 bool First = MD == MD->getCanonicalDecl(); 3576 3577 bool HadError = false; 3578 if (MD->getNumParams() != 1) { 3579 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 3580 << MD->getSourceRange(); 3581 HadError = true; 3582 } 3583 3584 QualType ReturnType = 3585 MD->getType()->getAs<FunctionType>()->getResultType(); 3586 if (!ReturnType->isLValueReferenceType() || 3587 !Context.hasSameType( 3588 Context.getCanonicalType(ReturnType->getPointeeType()), 3589 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3590 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 3591 HadError = true; 3592 } 3593 3594 ImplicitExceptionSpecification Spec( 3595 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 3596 3597 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3598 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3599 *ExceptionType = Context.getFunctionType( 3600 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3601 3602 QualType ArgType = OperType->getArgType(0); 3603 if (!ArgType->isRValueReferenceType()) { 3604 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 3605 HadError = true; 3606 } else { 3607 if (ArgType->getPointeeType().isVolatileQualified()) { 3608 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 3609 HadError = true; 3610 } 3611 if (ArgType->getPointeeType().isConstQualified()) { 3612 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 3613 HadError = true; 3614 } 3615 } 3616 3617 if (OperType->getTypeQuals()) { 3618 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 3619 HadError = true; 3620 } 3621 3622 if (OperType->hasExceptionSpec()) { 3623 if (CheckEquivalentExceptionSpec( 3624 PDiag(diag::err_incorrect_defaulted_exception_spec) 3625 << CXXMoveAssignment, 3626 PDiag(), 3627 ExceptionType, SourceLocation(), 3628 OperType, MD->getLocation())) { 3629 HadError = true; 3630 } 3631 } else if (First) { 3632 // We set the declaration to have the computed exception spec here. 3633 // We duplicate the one parameter type. 3634 EPI.RefQualifier = OperType->getRefQualifier(); 3635 EPI.ExtInfo = OperType->getExtInfo(); 3636 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3637 } 3638 3639 if (HadError) { 3640 MD->setInvalidDecl(); 3641 return; 3642 } 3643 3644 if (ShouldDeleteMoveAssignmentOperator(MD)) { 3645 if (First) { 3646 MD->setDeletedAsWritten(); 3647 } else { 3648 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3649 << CXXMoveAssignment; 3650 MD->setInvalidDecl(); 3651 } 3652 } 3653} 3654 3655void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3656 assert(DD->isExplicitlyDefaulted()); 3657 3658 // Whether this was the first-declared instance of the destructor. 3659 bool First = DD == DD->getCanonicalDecl(); 3660 3661 ImplicitExceptionSpecification Spec 3662 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3663 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3664 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3665 *ExceptionType = Context.getFunctionType( 3666 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3667 3668 if (DtorType->hasExceptionSpec()) { 3669 if (CheckEquivalentExceptionSpec( 3670 PDiag(diag::err_incorrect_defaulted_exception_spec) 3671 << CXXDestructor, 3672 PDiag(), 3673 ExceptionType, SourceLocation(), 3674 DtorType, DD->getLocation())) { 3675 DD->setInvalidDecl(); 3676 return; 3677 } 3678 } else if (First) { 3679 // We set the declaration to have the computed exception spec here. 3680 // There are no parameters. 3681 EPI.ExtInfo = DtorType->getExtInfo(); 3682 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3683 } 3684 3685 if (ShouldDeleteDestructor(DD)) { 3686 if (First) { 3687 DD->setDeletedAsWritten(); 3688 } else { 3689 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3690 << CXXDestructor; 3691 DD->setInvalidDecl(); 3692 } 3693 } 3694} 3695 3696bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3697 CXXRecordDecl *RD = CD->getParent(); 3698 assert(!RD->isDependentType() && "do deletion after instantiation"); 3699 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3700 return false; 3701 3702 SourceLocation Loc = CD->getLocation(); 3703 3704 // Do access control from the constructor 3705 ContextRAII CtorContext(*this, CD); 3706 3707 bool Union = RD->isUnion(); 3708 bool AllConst = true; 3709 3710 // We do this because we should never actually use an anonymous 3711 // union's constructor. 3712 if (Union && RD->isAnonymousStructOrUnion()) 3713 return false; 3714 3715 // FIXME: We should put some diagnostic logic right into this function. 3716 3717 // C++0x [class.ctor]/5 3718 // A defaulted default constructor for class X is defined as deleted if: 3719 3720 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3721 BE = RD->bases_end(); 3722 BI != BE; ++BI) { 3723 // We'll handle this one later 3724 if (BI->isVirtual()) 3725 continue; 3726 3727 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3728 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3729 3730 // -- any [direct base class] has a type with a destructor that is 3731 // deleted or inaccessible from the defaulted default constructor 3732 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3733 if (BaseDtor->isDeleted()) 3734 return true; 3735 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3736 AR_accessible) 3737 return true; 3738 3739 // -- any [direct base class either] has no default constructor or 3740 // overload resolution as applied to [its] default constructor 3741 // results in an ambiguity or in a function that is deleted or 3742 // inaccessible from the defaulted default constructor 3743 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3744 if (!BaseDefault || BaseDefault->isDeleted()) 3745 return true; 3746 3747 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3748 PDiag()) != AR_accessible) 3749 return true; 3750 } 3751 3752 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3753 BE = RD->vbases_end(); 3754 BI != BE; ++BI) { 3755 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3756 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3757 3758 // -- any [virtual base class] has a type with a destructor that is 3759 // delete or inaccessible from the defaulted default constructor 3760 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3761 if (BaseDtor->isDeleted()) 3762 return true; 3763 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3764 AR_accessible) 3765 return true; 3766 3767 // -- any [virtual base class either] has no default constructor or 3768 // overload resolution as applied to [its] default constructor 3769 // results in an ambiguity or in a function that is deleted or 3770 // inaccessible from the defaulted default constructor 3771 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3772 if (!BaseDefault || BaseDefault->isDeleted()) 3773 return true; 3774 3775 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3776 PDiag()) != AR_accessible) 3777 return true; 3778 } 3779 3780 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3781 FE = RD->field_end(); 3782 FI != FE; ++FI) { 3783 if (FI->isInvalidDecl()) 3784 continue; 3785 3786 QualType FieldType = Context.getBaseElementType(FI->getType()); 3787 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3788 3789 // -- any non-static data member with no brace-or-equal-initializer is of 3790 // reference type 3791 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3792 return true; 3793 3794 // -- X is a union and all its variant members are of const-qualified type 3795 // (or array thereof) 3796 if (Union && !FieldType.isConstQualified()) 3797 AllConst = false; 3798 3799 if (FieldRecord) { 3800 // -- X is a union-like class that has a variant member with a non-trivial 3801 // default constructor 3802 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3803 return true; 3804 3805 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3806 if (FieldDtor->isDeleted()) 3807 return true; 3808 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3809 AR_accessible) 3810 return true; 3811 3812 // -- any non-variant non-static data member of const-qualified type (or 3813 // array thereof) with no brace-or-equal-initializer does not have a 3814 // user-provided default constructor 3815 if (FieldType.isConstQualified() && 3816 !FI->hasInClassInitializer() && 3817 !FieldRecord->hasUserProvidedDefaultConstructor()) 3818 return true; 3819 3820 if (!Union && FieldRecord->isUnion() && 3821 FieldRecord->isAnonymousStructOrUnion()) { 3822 // We're okay to reuse AllConst here since we only care about the 3823 // value otherwise if we're in a union. 3824 AllConst = true; 3825 3826 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3827 UE = FieldRecord->field_end(); 3828 UI != UE; ++UI) { 3829 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3830 CXXRecordDecl *UnionFieldRecord = 3831 UnionFieldType->getAsCXXRecordDecl(); 3832 3833 if (!UnionFieldType.isConstQualified()) 3834 AllConst = false; 3835 3836 if (UnionFieldRecord && 3837 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3838 return true; 3839 } 3840 3841 if (AllConst) 3842 return true; 3843 3844 // Don't try to initialize the anonymous union 3845 // This is technically non-conformant, but sanity demands it. 3846 continue; 3847 } 3848 3849 // -- any non-static data member with no brace-or-equal-initializer has 3850 // class type M (or array thereof) and either M has no default 3851 // constructor or overload resolution as applied to M's default 3852 // constructor results in an ambiguity or in a function that is deleted 3853 // or inaccessible from the defaulted default constructor. 3854 if (!FI->hasInClassInitializer()) { 3855 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3856 if (!FieldDefault || FieldDefault->isDeleted()) 3857 return true; 3858 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3859 PDiag()) != AR_accessible) 3860 return true; 3861 } 3862 } else if (!Union && FieldType.isConstQualified() && 3863 !FI->hasInClassInitializer()) { 3864 // -- any non-variant non-static data member of const-qualified type (or 3865 // array thereof) with no brace-or-equal-initializer does not have a 3866 // user-provided default constructor 3867 return true; 3868 } 3869 } 3870 3871 if (Union && AllConst) 3872 return true; 3873 3874 return false; 3875} 3876 3877bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3878 CXXRecordDecl *RD = CD->getParent(); 3879 assert(!RD->isDependentType() && "do deletion after instantiation"); 3880 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3881 return false; 3882 3883 SourceLocation Loc = CD->getLocation(); 3884 3885 // Do access control from the constructor 3886 ContextRAII CtorContext(*this, CD); 3887 3888 bool Union = RD->isUnion(); 3889 3890 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3891 "copy assignment arg has no pointee type"); 3892 unsigned ArgQuals = 3893 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3894 Qualifiers::Const : 0; 3895 3896 // We do this because we should never actually use an anonymous 3897 // union's constructor. 3898 if (Union && RD->isAnonymousStructOrUnion()) 3899 return false; 3900 3901 // FIXME: We should put some diagnostic logic right into this function. 3902 3903 // C++0x [class.copy]/11 3904 // A defaulted [copy] constructor for class X is defined as delete if X has: 3905 3906 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3907 BE = RD->bases_end(); 3908 BI != BE; ++BI) { 3909 // We'll handle this one later 3910 if (BI->isVirtual()) 3911 continue; 3912 3913 QualType BaseType = BI->getType(); 3914 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3915 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3916 3917 // -- any [direct base class] of a type with a destructor that is deleted or 3918 // inaccessible from the defaulted constructor 3919 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3920 if (BaseDtor->isDeleted()) 3921 return true; 3922 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3923 AR_accessible) 3924 return true; 3925 3926 // -- a [direct base class] B that cannot be [copied] because overload 3927 // resolution, as applied to B's [copy] constructor, results in an 3928 // ambiguity or a function that is deleted or inaccessible from the 3929 // defaulted constructor 3930 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3931 if (!BaseCtor || BaseCtor->isDeleted()) 3932 return true; 3933 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3934 AR_accessible) 3935 return true; 3936 } 3937 3938 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3939 BE = RD->vbases_end(); 3940 BI != BE; ++BI) { 3941 QualType BaseType = BI->getType(); 3942 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3943 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3944 3945 // -- any [virtual base class] of a type with a destructor that is deleted or 3946 // inaccessible from the defaulted constructor 3947 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3948 if (BaseDtor->isDeleted()) 3949 return true; 3950 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3951 AR_accessible) 3952 return true; 3953 3954 // -- a [virtual base class] B that cannot be [copied] because overload 3955 // resolution, as applied to B's [copy] constructor, results in an 3956 // ambiguity or a function that is deleted or inaccessible from the 3957 // defaulted constructor 3958 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3959 if (!BaseCtor || BaseCtor->isDeleted()) 3960 return true; 3961 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3962 AR_accessible) 3963 return true; 3964 } 3965 3966 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3967 FE = RD->field_end(); 3968 FI != FE; ++FI) { 3969 QualType FieldType = Context.getBaseElementType(FI->getType()); 3970 3971 // -- for a copy constructor, a non-static data member of rvalue reference 3972 // type 3973 if (FieldType->isRValueReferenceType()) 3974 return true; 3975 3976 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3977 3978 if (FieldRecord) { 3979 // This is an anonymous union 3980 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3981 // Anonymous unions inside unions do not variant members create 3982 if (!Union) { 3983 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3984 UE = FieldRecord->field_end(); 3985 UI != UE; ++UI) { 3986 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3987 CXXRecordDecl *UnionFieldRecord = 3988 UnionFieldType->getAsCXXRecordDecl(); 3989 3990 // -- a variant member with a non-trivial [copy] constructor and X 3991 // is a union-like class 3992 if (UnionFieldRecord && 3993 !UnionFieldRecord->hasTrivialCopyConstructor()) 3994 return true; 3995 } 3996 } 3997 3998 // Don't try to initalize an anonymous union 3999 continue; 4000 } else { 4001 // -- a variant member with a non-trivial [copy] constructor and X is a 4002 // union-like class 4003 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 4004 return true; 4005 4006 // -- any [non-static data member] of a type with a destructor that is 4007 // deleted or inaccessible from the defaulted constructor 4008 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4009 if (FieldDtor->isDeleted()) 4010 return true; 4011 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4012 AR_accessible) 4013 return true; 4014 } 4015 4016 // -- a [non-static data member of class type (or array thereof)] B that 4017 // cannot be [copied] because overload resolution, as applied to B's 4018 // [copy] constructor, results in an ambiguity or a function that is 4019 // deleted or inaccessible from the defaulted constructor 4020 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 4021 ArgQuals); 4022 if (!FieldCtor || FieldCtor->isDeleted()) 4023 return true; 4024 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4025 PDiag()) != AR_accessible) 4026 return true; 4027 } 4028 } 4029 4030 return false; 4031} 4032 4033bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4034 CXXRecordDecl *RD = MD->getParent(); 4035 assert(!RD->isDependentType() && "do deletion after instantiation"); 4036 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4037 return false; 4038 4039 SourceLocation Loc = MD->getLocation(); 4040 4041 // Do access control from the constructor 4042 ContextRAII MethodContext(*this, MD); 4043 4044 bool Union = RD->isUnion(); 4045 4046 unsigned ArgQuals = 4047 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4048 Qualifiers::Const : 0; 4049 4050 // We do this because we should never actually use an anonymous 4051 // union's constructor. 4052 if (Union && RD->isAnonymousStructOrUnion()) 4053 return false; 4054 4055 // FIXME: We should put some diagnostic logic right into this function. 4056 4057 // C++0x [class.copy]/20 4058 // A defaulted [copy] assignment operator for class X is defined as deleted 4059 // if X has: 4060 4061 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4062 BE = RD->bases_end(); 4063 BI != BE; ++BI) { 4064 // We'll handle this one later 4065 if (BI->isVirtual()) 4066 continue; 4067 4068 QualType BaseType = BI->getType(); 4069 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4070 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4071 4072 // -- a [direct base class] B that cannot be [copied] because overload 4073 // resolution, as applied to B's [copy] assignment operator, results in 4074 // an ambiguity or a function that is deleted or inaccessible from the 4075 // assignment operator 4076 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4077 0); 4078 if (!CopyOper || CopyOper->isDeleted()) 4079 return true; 4080 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4081 return true; 4082 } 4083 4084 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4085 BE = RD->vbases_end(); 4086 BI != BE; ++BI) { 4087 QualType BaseType = BI->getType(); 4088 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4089 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4090 4091 // -- a [virtual base class] B that cannot be [copied] because overload 4092 // resolution, as applied to B's [copy] assignment operator, results in 4093 // an ambiguity or a function that is deleted or inaccessible from the 4094 // assignment operator 4095 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4096 0); 4097 if (!CopyOper || CopyOper->isDeleted()) 4098 return true; 4099 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4100 return true; 4101 } 4102 4103 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4104 FE = RD->field_end(); 4105 FI != FE; ++FI) { 4106 QualType FieldType = Context.getBaseElementType(FI->getType()); 4107 4108 // -- a non-static data member of reference type 4109 if (FieldType->isReferenceType()) 4110 return true; 4111 4112 // -- a non-static data member of const non-class type (or array thereof) 4113 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4114 return true; 4115 4116 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4117 4118 if (FieldRecord) { 4119 // This is an anonymous union 4120 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4121 // Anonymous unions inside unions do not variant members create 4122 if (!Union) { 4123 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4124 UE = FieldRecord->field_end(); 4125 UI != UE; ++UI) { 4126 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4127 CXXRecordDecl *UnionFieldRecord = 4128 UnionFieldType->getAsCXXRecordDecl(); 4129 4130 // -- a variant member with a non-trivial [copy] assignment operator 4131 // and X is a union-like class 4132 if (UnionFieldRecord && 4133 !UnionFieldRecord->hasTrivialCopyAssignment()) 4134 return true; 4135 } 4136 } 4137 4138 // Don't try to initalize an anonymous union 4139 continue; 4140 // -- a variant member with a non-trivial [copy] assignment operator 4141 // and X is a union-like class 4142 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4143 return true; 4144 } 4145 4146 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4147 false, 0); 4148 if (!CopyOper || CopyOper->isDeleted()) 4149 return true; 4150 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4151 return true; 4152 } 4153 } 4154 4155 return false; 4156} 4157 4158bool Sema::ShouldDeleteMoveConstructor(CXXConstructorDecl *CD) { 4159 CXXRecordDecl *RD = CD->getParent(); 4160 assert(!RD->isDependentType() && "do deletion after instantiation"); 4161 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4162 return false; 4163 4164 SourceLocation Loc = CD->getLocation(); 4165 4166 // Do access control from the constructor 4167 ContextRAII CtorContext(*this, CD); 4168 4169 bool Union = RD->isUnion(); 4170 4171 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 4172 "copy assignment arg has no pointee type"); 4173 4174 // We do this because we should never actually use an anonymous 4175 // union's constructor. 4176 if (Union && RD->isAnonymousStructOrUnion()) 4177 return false; 4178 4179 // C++0x [class.copy]/11 4180 // A defaulted [move] constructor for class X is defined as deleted 4181 // if X has: 4182 4183 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4184 BE = RD->bases_end(); 4185 BI != BE; ++BI) { 4186 // We'll handle this one later 4187 if (BI->isVirtual()) 4188 continue; 4189 4190 QualType BaseType = BI->getType(); 4191 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4192 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4193 4194 // -- any [direct base class] of a type with a destructor that is deleted or 4195 // inaccessible from the defaulted constructor 4196 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4197 if (BaseDtor->isDeleted()) 4198 return true; 4199 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4200 AR_accessible) 4201 return true; 4202 4203 // -- a [direct base class] B that cannot be [moved] because overload 4204 // resolution, as applied to B's [move] constructor, results in an 4205 // ambiguity or a function that is deleted or inaccessible from the 4206 // defaulted constructor 4207 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4208 if (!BaseCtor || BaseCtor->isDeleted()) 4209 return true; 4210 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4211 AR_accessible) 4212 return true; 4213 4214 // -- for a move constructor, a [direct base class] with a type that 4215 // does not have a move constructor and is not trivially copyable. 4216 // If the field isn't a record, it's always trivially copyable. 4217 // A moving constructor could be a copy constructor instead. 4218 if (!BaseCtor->isMoveConstructor() && 4219 !BaseDecl->isTriviallyCopyable()) 4220 return true; 4221 } 4222 4223 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4224 BE = RD->vbases_end(); 4225 BI != BE; ++BI) { 4226 QualType BaseType = BI->getType(); 4227 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4228 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4229 4230 // -- any [virtual base class] of a type with a destructor that is deleted 4231 // or inaccessible from the defaulted constructor 4232 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4233 if (BaseDtor->isDeleted()) 4234 return true; 4235 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4236 AR_accessible) 4237 return true; 4238 4239 // -- a [virtual base class] B that cannot be [moved] because overload 4240 // resolution, as applied to B's [move] constructor, results in an 4241 // ambiguity or a function that is deleted or inaccessible from the 4242 // defaulted constructor 4243 CXXConstructorDecl *BaseCtor = LookupMovingConstructor(BaseDecl); 4244 if (!BaseCtor || BaseCtor->isDeleted()) 4245 return true; 4246 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 4247 AR_accessible) 4248 return true; 4249 4250 // -- for a move constructor, a [virtual base class] with a type that 4251 // does not have a move constructor and is not trivially copyable. 4252 // If the field isn't a record, it's always trivially copyable. 4253 // A moving constructor could be a copy constructor instead. 4254 if (!BaseCtor->isMoveConstructor() && 4255 !BaseDecl->isTriviallyCopyable()) 4256 return true; 4257 } 4258 4259 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4260 FE = RD->field_end(); 4261 FI != FE; ++FI) { 4262 QualType FieldType = Context.getBaseElementType(FI->getType()); 4263 4264 if (CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl()) { 4265 // This is an anonymous union 4266 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4267 // Anonymous unions inside unions do not variant members create 4268 if (!Union) { 4269 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4270 UE = FieldRecord->field_end(); 4271 UI != UE; ++UI) { 4272 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4273 CXXRecordDecl *UnionFieldRecord = 4274 UnionFieldType->getAsCXXRecordDecl(); 4275 4276 // -- a variant member with a non-trivial [move] constructor and X 4277 // is a union-like class 4278 if (UnionFieldRecord && 4279 !UnionFieldRecord->hasTrivialMoveConstructor()) 4280 return true; 4281 } 4282 } 4283 4284 // Don't try to initalize an anonymous union 4285 continue; 4286 } else { 4287 // -- a variant member with a non-trivial [move] constructor and X is a 4288 // union-like class 4289 if (Union && !FieldRecord->hasTrivialMoveConstructor()) 4290 return true; 4291 4292 // -- any [non-static data member] of a type with a destructor that is 4293 // deleted or inaccessible from the defaulted constructor 4294 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4295 if (FieldDtor->isDeleted()) 4296 return true; 4297 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4298 AR_accessible) 4299 return true; 4300 } 4301 4302 // -- a [non-static data member of class type (or array thereof)] B that 4303 // cannot be [moved] because overload resolution, as applied to B's 4304 // [move] constructor, results in an ambiguity or a function that is 4305 // deleted or inaccessible from the defaulted constructor 4306 CXXConstructorDecl *FieldCtor = LookupMovingConstructor(FieldRecord); 4307 if (!FieldCtor || FieldCtor->isDeleted()) 4308 return true; 4309 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4310 PDiag()) != AR_accessible) 4311 return true; 4312 4313 // -- for a move constructor, a [non-static data member] with a type that 4314 // does not have a move constructor and is not trivially copyable. 4315 // If the field isn't a record, it's always trivially copyable. 4316 // A moving constructor could be a copy constructor instead. 4317 if (!FieldCtor->isMoveConstructor() && 4318 !FieldRecord->isTriviallyCopyable()) 4319 return true; 4320 } 4321 } 4322 4323 return false; 4324} 4325 4326bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4327 CXXRecordDecl *RD = MD->getParent(); 4328 assert(!RD->isDependentType() && "do deletion after instantiation"); 4329 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4330 return false; 4331 4332 SourceLocation Loc = MD->getLocation(); 4333 4334 // Do access control from the constructor 4335 ContextRAII MethodContext(*this, MD); 4336 4337 bool Union = RD->isUnion(); 4338 4339 // We do this because we should never actually use an anonymous 4340 // union's constructor. 4341 if (Union && RD->isAnonymousStructOrUnion()) 4342 return false; 4343 4344 // C++0x [class.copy]/20 4345 // A defaulted [move] assignment operator for class X is defined as deleted 4346 // if X has: 4347 4348 // -- for the move constructor, [...] any direct or indirect virtual base 4349 // class. 4350 if (RD->getNumVBases() != 0) 4351 return true; 4352 4353 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4354 BE = RD->bases_end(); 4355 BI != BE; ++BI) { 4356 4357 QualType BaseType = BI->getType(); 4358 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4359 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4360 4361 // -- a [direct base class] B that cannot be [moved] because overload 4362 // resolution, as applied to B's [move] assignment operator, results in 4363 // an ambiguity or a function that is deleted or inaccessible from the 4364 // assignment operator 4365 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4366 if (!MoveOper || MoveOper->isDeleted()) 4367 return true; 4368 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4369 return true; 4370 4371 // -- for the move assignment operator, a [direct base class] with a type 4372 // that does not have a move assignment operator and is not trivially 4373 // copyable. 4374 if (!MoveOper->isMoveAssignmentOperator() && 4375 !BaseDecl->isTriviallyCopyable()) 4376 return true; 4377 } 4378 4379 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4380 FE = RD->field_end(); 4381 FI != FE; ++FI) { 4382 QualType FieldType = Context.getBaseElementType(FI->getType()); 4383 4384 // -- a non-static data member of reference type 4385 if (FieldType->isReferenceType()) 4386 return true; 4387 4388 // -- a non-static data member of const non-class type (or array thereof) 4389 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4390 return true; 4391 4392 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4393 4394 if (FieldRecord) { 4395 // This is an anonymous union 4396 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4397 // Anonymous unions inside unions do not variant members create 4398 if (!Union) { 4399 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4400 UE = FieldRecord->field_end(); 4401 UI != UE; ++UI) { 4402 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4403 CXXRecordDecl *UnionFieldRecord = 4404 UnionFieldType->getAsCXXRecordDecl(); 4405 4406 // -- a variant member with a non-trivial [move] assignment operator 4407 // and X is a union-like class 4408 if (UnionFieldRecord && 4409 !UnionFieldRecord->hasTrivialMoveAssignment()) 4410 return true; 4411 } 4412 } 4413 4414 // Don't try to initalize an anonymous union 4415 continue; 4416 // -- a variant member with a non-trivial [move] assignment operator 4417 // and X is a union-like class 4418 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4419 return true; 4420 } 4421 4422 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4423 if (!MoveOper || MoveOper->isDeleted()) 4424 return true; 4425 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4426 return true; 4427 4428 // -- for the move assignment operator, a [non-static data member] with a 4429 // type that does not have a move assignment operator and is not 4430 // trivially copyable. 4431 if (!MoveOper->isMoveAssignmentOperator() && 4432 !FieldRecord->isTriviallyCopyable()) 4433 return true; 4434 } 4435 } 4436 4437 return false; 4438} 4439 4440bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4441 CXXRecordDecl *RD = DD->getParent(); 4442 assert(!RD->isDependentType() && "do deletion after instantiation"); 4443 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4444 return false; 4445 4446 SourceLocation Loc = DD->getLocation(); 4447 4448 // Do access control from the destructor 4449 ContextRAII CtorContext(*this, DD); 4450 4451 bool Union = RD->isUnion(); 4452 4453 // We do this because we should never actually use an anonymous 4454 // union's destructor. 4455 if (Union && RD->isAnonymousStructOrUnion()) 4456 return false; 4457 4458 // C++0x [class.dtor]p5 4459 // A defaulted destructor for a class X is defined as deleted if: 4460 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4461 BE = RD->bases_end(); 4462 BI != BE; ++BI) { 4463 // We'll handle this one later 4464 if (BI->isVirtual()) 4465 continue; 4466 4467 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4468 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4469 assert(BaseDtor && "base has no destructor"); 4470 4471 // -- any direct or virtual base class has a deleted destructor or 4472 // a destructor that is inaccessible from the defaulted destructor 4473 if (BaseDtor->isDeleted()) 4474 return true; 4475 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4476 AR_accessible) 4477 return true; 4478 } 4479 4480 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4481 BE = RD->vbases_end(); 4482 BI != BE; ++BI) { 4483 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4484 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4485 assert(BaseDtor && "base has no destructor"); 4486 4487 // -- any direct or virtual base class has a deleted destructor or 4488 // a destructor that is inaccessible from the defaulted destructor 4489 if (BaseDtor->isDeleted()) 4490 return true; 4491 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4492 AR_accessible) 4493 return true; 4494 } 4495 4496 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4497 FE = RD->field_end(); 4498 FI != FE; ++FI) { 4499 QualType FieldType = Context.getBaseElementType(FI->getType()); 4500 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4501 if (FieldRecord) { 4502 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4503 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4504 UE = FieldRecord->field_end(); 4505 UI != UE; ++UI) { 4506 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4507 CXXRecordDecl *UnionFieldRecord = 4508 UnionFieldType->getAsCXXRecordDecl(); 4509 4510 // -- X is a union-like class that has a variant member with a non- 4511 // trivial destructor. 4512 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4513 return true; 4514 } 4515 // Technically we are supposed to do this next check unconditionally. 4516 // But that makes absolutely no sense. 4517 } else { 4518 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4519 4520 // -- any of the non-static data members has class type M (or array 4521 // thereof) and M has a deleted destructor or a destructor that is 4522 // inaccessible from the defaulted destructor 4523 if (FieldDtor->isDeleted()) 4524 return true; 4525 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4526 AR_accessible) 4527 return true; 4528 4529 // -- X is a union-like class that has a variant member with a non- 4530 // trivial destructor. 4531 if (Union && !FieldDtor->isTrivial()) 4532 return true; 4533 } 4534 } 4535 } 4536 4537 if (DD->isVirtual()) { 4538 FunctionDecl *OperatorDelete = 0; 4539 DeclarationName Name = 4540 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4541 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4542 false)) 4543 return true; 4544 } 4545 4546 4547 return false; 4548} 4549 4550/// \brief Data used with FindHiddenVirtualMethod 4551namespace { 4552 struct FindHiddenVirtualMethodData { 4553 Sema *S; 4554 CXXMethodDecl *Method; 4555 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4556 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4557 }; 4558} 4559 4560/// \brief Member lookup function that determines whether a given C++ 4561/// method overloads virtual methods in a base class without overriding any, 4562/// to be used with CXXRecordDecl::lookupInBases(). 4563static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4564 CXXBasePath &Path, 4565 void *UserData) { 4566 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4567 4568 FindHiddenVirtualMethodData &Data 4569 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4570 4571 DeclarationName Name = Data.Method->getDeclName(); 4572 assert(Name.getNameKind() == DeclarationName::Identifier); 4573 4574 bool foundSameNameMethod = false; 4575 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4576 for (Path.Decls = BaseRecord->lookup(Name); 4577 Path.Decls.first != Path.Decls.second; 4578 ++Path.Decls.first) { 4579 NamedDecl *D = *Path.Decls.first; 4580 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4581 MD = MD->getCanonicalDecl(); 4582 foundSameNameMethod = true; 4583 // Interested only in hidden virtual methods. 4584 if (!MD->isVirtual()) 4585 continue; 4586 // If the method we are checking overrides a method from its base 4587 // don't warn about the other overloaded methods. 4588 if (!Data.S->IsOverload(Data.Method, MD, false)) 4589 return true; 4590 // Collect the overload only if its hidden. 4591 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4592 overloadedMethods.push_back(MD); 4593 } 4594 } 4595 4596 if (foundSameNameMethod) 4597 Data.OverloadedMethods.append(overloadedMethods.begin(), 4598 overloadedMethods.end()); 4599 return foundSameNameMethod; 4600} 4601 4602/// \brief See if a method overloads virtual methods in a base class without 4603/// overriding any. 4604void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4605 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4606 MD->getLocation()) == Diagnostic::Ignored) 4607 return; 4608 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4609 return; 4610 4611 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4612 /*bool RecordPaths=*/false, 4613 /*bool DetectVirtual=*/false); 4614 FindHiddenVirtualMethodData Data; 4615 Data.Method = MD; 4616 Data.S = this; 4617 4618 // Keep the base methods that were overriden or introduced in the subclass 4619 // by 'using' in a set. A base method not in this set is hidden. 4620 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4621 res.first != res.second; ++res.first) { 4622 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4623 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4624 E = MD->end_overridden_methods(); 4625 I != E; ++I) 4626 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4627 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4628 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4629 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4630 } 4631 4632 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4633 !Data.OverloadedMethods.empty()) { 4634 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4635 << MD << (Data.OverloadedMethods.size() > 1); 4636 4637 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4638 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4639 Diag(overloadedMD->getLocation(), 4640 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4641 } 4642 } 4643} 4644 4645void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4646 Decl *TagDecl, 4647 SourceLocation LBrac, 4648 SourceLocation RBrac, 4649 AttributeList *AttrList) { 4650 if (!TagDecl) 4651 return; 4652 4653 AdjustDeclIfTemplate(TagDecl); 4654 4655 ActOnFields(S, RLoc, TagDecl, 4656 // strict aliasing violation! 4657 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4658 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4659 4660 CheckCompletedCXXClass( 4661 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4662} 4663 4664/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4665/// special functions, such as the default constructor, copy 4666/// constructor, or destructor, to the given C++ class (C++ 4667/// [special]p1). This routine can only be executed just before the 4668/// definition of the class is complete. 4669void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4670 if (!ClassDecl->hasUserDeclaredConstructor()) 4671 ++ASTContext::NumImplicitDefaultConstructors; 4672 4673 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4674 ++ASTContext::NumImplicitCopyConstructors; 4675 4676 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4677 ++ASTContext::NumImplicitCopyAssignmentOperators; 4678 4679 // If we have a dynamic class, then the copy assignment operator may be 4680 // virtual, so we have to declare it immediately. This ensures that, e.g., 4681 // it shows up in the right place in the vtable and that we diagnose 4682 // problems with the implicit exception specification. 4683 if (ClassDecl->isDynamicClass()) 4684 DeclareImplicitCopyAssignment(ClassDecl); 4685 } 4686 4687 if (!ClassDecl->hasUserDeclaredDestructor()) { 4688 ++ASTContext::NumImplicitDestructors; 4689 4690 // If we have a dynamic class, then the destructor may be virtual, so we 4691 // have to declare the destructor immediately. This ensures that, e.g., it 4692 // shows up in the right place in the vtable and that we diagnose problems 4693 // with the implicit exception specification. 4694 if (ClassDecl->isDynamicClass()) 4695 DeclareImplicitDestructor(ClassDecl); 4696 } 4697} 4698 4699void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4700 if (!D) 4701 return; 4702 4703 int NumParamList = D->getNumTemplateParameterLists(); 4704 for (int i = 0; i < NumParamList; i++) { 4705 TemplateParameterList* Params = D->getTemplateParameterList(i); 4706 for (TemplateParameterList::iterator Param = Params->begin(), 4707 ParamEnd = Params->end(); 4708 Param != ParamEnd; ++Param) { 4709 NamedDecl *Named = cast<NamedDecl>(*Param); 4710 if (Named->getDeclName()) { 4711 S->AddDecl(Named); 4712 IdResolver.AddDecl(Named); 4713 } 4714 } 4715 } 4716} 4717 4718void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4719 if (!D) 4720 return; 4721 4722 TemplateParameterList *Params = 0; 4723 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4724 Params = Template->getTemplateParameters(); 4725 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4726 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4727 Params = PartialSpec->getTemplateParameters(); 4728 else 4729 return; 4730 4731 for (TemplateParameterList::iterator Param = Params->begin(), 4732 ParamEnd = Params->end(); 4733 Param != ParamEnd; ++Param) { 4734 NamedDecl *Named = cast<NamedDecl>(*Param); 4735 if (Named->getDeclName()) { 4736 S->AddDecl(Named); 4737 IdResolver.AddDecl(Named); 4738 } 4739 } 4740} 4741 4742void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4743 if (!RecordD) return; 4744 AdjustDeclIfTemplate(RecordD); 4745 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4746 PushDeclContext(S, Record); 4747} 4748 4749void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4750 if (!RecordD) return; 4751 PopDeclContext(); 4752} 4753 4754/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4755/// parsing a top-level (non-nested) C++ class, and we are now 4756/// parsing those parts of the given Method declaration that could 4757/// not be parsed earlier (C++ [class.mem]p2), such as default 4758/// arguments. This action should enter the scope of the given 4759/// Method declaration as if we had just parsed the qualified method 4760/// name. However, it should not bring the parameters into scope; 4761/// that will be performed by ActOnDelayedCXXMethodParameter. 4762void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4763} 4764 4765/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4766/// C++ method declaration. We're (re-)introducing the given 4767/// function parameter into scope for use in parsing later parts of 4768/// the method declaration. For example, we could see an 4769/// ActOnParamDefaultArgument event for this parameter. 4770void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4771 if (!ParamD) 4772 return; 4773 4774 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4775 4776 // If this parameter has an unparsed default argument, clear it out 4777 // to make way for the parsed default argument. 4778 if (Param->hasUnparsedDefaultArg()) 4779 Param->setDefaultArg(0); 4780 4781 S->AddDecl(Param); 4782 if (Param->getDeclName()) 4783 IdResolver.AddDecl(Param); 4784} 4785 4786/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4787/// processing the delayed method declaration for Method. The method 4788/// declaration is now considered finished. There may be a separate 4789/// ActOnStartOfFunctionDef action later (not necessarily 4790/// immediately!) for this method, if it was also defined inside the 4791/// class body. 4792void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4793 if (!MethodD) 4794 return; 4795 4796 AdjustDeclIfTemplate(MethodD); 4797 4798 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4799 4800 // Now that we have our default arguments, check the constructor 4801 // again. It could produce additional diagnostics or affect whether 4802 // the class has implicitly-declared destructors, among other 4803 // things. 4804 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4805 CheckConstructor(Constructor); 4806 4807 // Check the default arguments, which we may have added. 4808 if (!Method->isInvalidDecl()) 4809 CheckCXXDefaultArguments(Method); 4810} 4811 4812/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4813/// the well-formedness of the constructor declarator @p D with type @p 4814/// R. If there are any errors in the declarator, this routine will 4815/// emit diagnostics and set the invalid bit to true. In any case, the type 4816/// will be updated to reflect a well-formed type for the constructor and 4817/// returned. 4818QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4819 StorageClass &SC) { 4820 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4821 4822 // C++ [class.ctor]p3: 4823 // A constructor shall not be virtual (10.3) or static (9.4). A 4824 // constructor can be invoked for a const, volatile or const 4825 // volatile object. A constructor shall not be declared const, 4826 // volatile, or const volatile (9.3.2). 4827 if (isVirtual) { 4828 if (!D.isInvalidType()) 4829 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4830 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4831 << SourceRange(D.getIdentifierLoc()); 4832 D.setInvalidType(); 4833 } 4834 if (SC == SC_Static) { 4835 if (!D.isInvalidType()) 4836 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4837 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4838 << SourceRange(D.getIdentifierLoc()); 4839 D.setInvalidType(); 4840 SC = SC_None; 4841 } 4842 4843 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4844 if (FTI.TypeQuals != 0) { 4845 if (FTI.TypeQuals & Qualifiers::Const) 4846 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4847 << "const" << SourceRange(D.getIdentifierLoc()); 4848 if (FTI.TypeQuals & Qualifiers::Volatile) 4849 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4850 << "volatile" << SourceRange(D.getIdentifierLoc()); 4851 if (FTI.TypeQuals & Qualifiers::Restrict) 4852 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4853 << "restrict" << SourceRange(D.getIdentifierLoc()); 4854 D.setInvalidType(); 4855 } 4856 4857 // C++0x [class.ctor]p4: 4858 // A constructor shall not be declared with a ref-qualifier. 4859 if (FTI.hasRefQualifier()) { 4860 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4861 << FTI.RefQualifierIsLValueRef 4862 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4863 D.setInvalidType(); 4864 } 4865 4866 // Rebuild the function type "R" without any type qualifiers (in 4867 // case any of the errors above fired) and with "void" as the 4868 // return type, since constructors don't have return types. 4869 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4870 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4871 return R; 4872 4873 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4874 EPI.TypeQuals = 0; 4875 EPI.RefQualifier = RQ_None; 4876 4877 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4878 Proto->getNumArgs(), EPI); 4879} 4880 4881/// CheckConstructor - Checks a fully-formed constructor for 4882/// well-formedness, issuing any diagnostics required. Returns true if 4883/// the constructor declarator is invalid. 4884void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4885 CXXRecordDecl *ClassDecl 4886 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4887 if (!ClassDecl) 4888 return Constructor->setInvalidDecl(); 4889 4890 // C++ [class.copy]p3: 4891 // A declaration of a constructor for a class X is ill-formed if 4892 // its first parameter is of type (optionally cv-qualified) X and 4893 // either there are no other parameters or else all other 4894 // parameters have default arguments. 4895 if (!Constructor->isInvalidDecl() && 4896 ((Constructor->getNumParams() == 1) || 4897 (Constructor->getNumParams() > 1 && 4898 Constructor->getParamDecl(1)->hasDefaultArg())) && 4899 Constructor->getTemplateSpecializationKind() 4900 != TSK_ImplicitInstantiation) { 4901 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4902 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4903 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4904 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4905 const char *ConstRef 4906 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4907 : " const &"; 4908 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4909 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4910 4911 // FIXME: Rather that making the constructor invalid, we should endeavor 4912 // to fix the type. 4913 Constructor->setInvalidDecl(); 4914 } 4915 } 4916} 4917 4918/// CheckDestructor - Checks a fully-formed destructor definition for 4919/// well-formedness, issuing any diagnostics required. Returns true 4920/// on error. 4921bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4922 CXXRecordDecl *RD = Destructor->getParent(); 4923 4924 if (Destructor->isVirtual()) { 4925 SourceLocation Loc; 4926 4927 if (!Destructor->isImplicit()) 4928 Loc = Destructor->getLocation(); 4929 else 4930 Loc = RD->getLocation(); 4931 4932 // If we have a virtual destructor, look up the deallocation function 4933 FunctionDecl *OperatorDelete = 0; 4934 DeclarationName Name = 4935 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4936 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4937 return true; 4938 4939 MarkDeclarationReferenced(Loc, OperatorDelete); 4940 4941 Destructor->setOperatorDelete(OperatorDelete); 4942 } 4943 4944 return false; 4945} 4946 4947static inline bool 4948FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4949 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4950 FTI.ArgInfo[0].Param && 4951 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4952} 4953 4954/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4955/// the well-formednes of the destructor declarator @p D with type @p 4956/// R. If there are any errors in the declarator, this routine will 4957/// emit diagnostics and set the declarator to invalid. Even if this happens, 4958/// will be updated to reflect a well-formed type for the destructor and 4959/// returned. 4960QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4961 StorageClass& SC) { 4962 // C++ [class.dtor]p1: 4963 // [...] A typedef-name that names a class is a class-name 4964 // (7.1.3); however, a typedef-name that names a class shall not 4965 // be used as the identifier in the declarator for a destructor 4966 // declaration. 4967 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4968 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4969 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4970 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4971 else if (const TemplateSpecializationType *TST = 4972 DeclaratorType->getAs<TemplateSpecializationType>()) 4973 if (TST->isTypeAlias()) 4974 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4975 << DeclaratorType << 1; 4976 4977 // C++ [class.dtor]p2: 4978 // A destructor is used to destroy objects of its class type. A 4979 // destructor takes no parameters, and no return type can be 4980 // specified for it (not even void). The address of a destructor 4981 // shall not be taken. A destructor shall not be static. A 4982 // destructor can be invoked for a const, volatile or const 4983 // volatile object. A destructor shall not be declared const, 4984 // volatile or const volatile (9.3.2). 4985 if (SC == SC_Static) { 4986 if (!D.isInvalidType()) 4987 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4988 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4989 << SourceRange(D.getIdentifierLoc()) 4990 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4991 4992 SC = SC_None; 4993 } 4994 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4995 // Destructors don't have return types, but the parser will 4996 // happily parse something like: 4997 // 4998 // class X { 4999 // float ~X(); 5000 // }; 5001 // 5002 // The return type will be eliminated later. 5003 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5004 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5005 << SourceRange(D.getIdentifierLoc()); 5006 } 5007 5008 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5009 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5010 if (FTI.TypeQuals & Qualifiers::Const) 5011 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5012 << "const" << SourceRange(D.getIdentifierLoc()); 5013 if (FTI.TypeQuals & Qualifiers::Volatile) 5014 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5015 << "volatile" << SourceRange(D.getIdentifierLoc()); 5016 if (FTI.TypeQuals & Qualifiers::Restrict) 5017 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5018 << "restrict" << SourceRange(D.getIdentifierLoc()); 5019 D.setInvalidType(); 5020 } 5021 5022 // C++0x [class.dtor]p2: 5023 // A destructor shall not be declared with a ref-qualifier. 5024 if (FTI.hasRefQualifier()) { 5025 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5026 << FTI.RefQualifierIsLValueRef 5027 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5028 D.setInvalidType(); 5029 } 5030 5031 // Make sure we don't have any parameters. 5032 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5033 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5034 5035 // Delete the parameters. 5036 FTI.freeArgs(); 5037 D.setInvalidType(); 5038 } 5039 5040 // Make sure the destructor isn't variadic. 5041 if (FTI.isVariadic) { 5042 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5043 D.setInvalidType(); 5044 } 5045 5046 // Rebuild the function type "R" without any type qualifiers or 5047 // parameters (in case any of the errors above fired) and with 5048 // "void" as the return type, since destructors don't have return 5049 // types. 5050 if (!D.isInvalidType()) 5051 return R; 5052 5053 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5054 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5055 EPI.Variadic = false; 5056 EPI.TypeQuals = 0; 5057 EPI.RefQualifier = RQ_None; 5058 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5059} 5060 5061/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5062/// well-formednes of the conversion function declarator @p D with 5063/// type @p R. If there are any errors in the declarator, this routine 5064/// will emit diagnostics and return true. Otherwise, it will return 5065/// false. Either way, the type @p R will be updated to reflect a 5066/// well-formed type for the conversion operator. 5067void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5068 StorageClass& SC) { 5069 // C++ [class.conv.fct]p1: 5070 // Neither parameter types nor return type can be specified. The 5071 // type of a conversion function (8.3.5) is "function taking no 5072 // parameter returning conversion-type-id." 5073 if (SC == SC_Static) { 5074 if (!D.isInvalidType()) 5075 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5076 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5077 << SourceRange(D.getIdentifierLoc()); 5078 D.setInvalidType(); 5079 SC = SC_None; 5080 } 5081 5082 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5083 5084 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5085 // Conversion functions don't have return types, but the parser will 5086 // happily parse something like: 5087 // 5088 // class X { 5089 // float operator bool(); 5090 // }; 5091 // 5092 // The return type will be changed later anyway. 5093 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5094 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5095 << SourceRange(D.getIdentifierLoc()); 5096 D.setInvalidType(); 5097 } 5098 5099 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5100 5101 // Make sure we don't have any parameters. 5102 if (Proto->getNumArgs() > 0) { 5103 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5104 5105 // Delete the parameters. 5106 D.getFunctionTypeInfo().freeArgs(); 5107 D.setInvalidType(); 5108 } else if (Proto->isVariadic()) { 5109 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5110 D.setInvalidType(); 5111 } 5112 5113 // Diagnose "&operator bool()" and other such nonsense. This 5114 // is actually a gcc extension which we don't support. 5115 if (Proto->getResultType() != ConvType) { 5116 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5117 << Proto->getResultType(); 5118 D.setInvalidType(); 5119 ConvType = Proto->getResultType(); 5120 } 5121 5122 // C++ [class.conv.fct]p4: 5123 // The conversion-type-id shall not represent a function type nor 5124 // an array type. 5125 if (ConvType->isArrayType()) { 5126 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5127 ConvType = Context.getPointerType(ConvType); 5128 D.setInvalidType(); 5129 } else if (ConvType->isFunctionType()) { 5130 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5131 ConvType = Context.getPointerType(ConvType); 5132 D.setInvalidType(); 5133 } 5134 5135 // Rebuild the function type "R" without any parameters (in case any 5136 // of the errors above fired) and with the conversion type as the 5137 // return type. 5138 if (D.isInvalidType()) 5139 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5140 5141 // C++0x explicit conversion operators. 5142 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 5143 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5144 diag::warn_explicit_conversion_functions) 5145 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5146} 5147 5148/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5149/// the declaration of the given C++ conversion function. This routine 5150/// is responsible for recording the conversion function in the C++ 5151/// class, if possible. 5152Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5153 assert(Conversion && "Expected to receive a conversion function declaration"); 5154 5155 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5156 5157 // Make sure we aren't redeclaring the conversion function. 5158 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5159 5160 // C++ [class.conv.fct]p1: 5161 // [...] A conversion function is never used to convert a 5162 // (possibly cv-qualified) object to the (possibly cv-qualified) 5163 // same object type (or a reference to it), to a (possibly 5164 // cv-qualified) base class of that type (or a reference to it), 5165 // or to (possibly cv-qualified) void. 5166 // FIXME: Suppress this warning if the conversion function ends up being a 5167 // virtual function that overrides a virtual function in a base class. 5168 QualType ClassType 5169 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5170 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5171 ConvType = ConvTypeRef->getPointeeType(); 5172 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5173 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5174 /* Suppress diagnostics for instantiations. */; 5175 else if (ConvType->isRecordType()) { 5176 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5177 if (ConvType == ClassType) 5178 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5179 << ClassType; 5180 else if (IsDerivedFrom(ClassType, ConvType)) 5181 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5182 << ClassType << ConvType; 5183 } else if (ConvType->isVoidType()) { 5184 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5185 << ClassType << ConvType; 5186 } 5187 5188 if (FunctionTemplateDecl *ConversionTemplate 5189 = Conversion->getDescribedFunctionTemplate()) 5190 return ConversionTemplate; 5191 5192 return Conversion; 5193} 5194 5195//===----------------------------------------------------------------------===// 5196// Namespace Handling 5197//===----------------------------------------------------------------------===// 5198 5199 5200 5201/// ActOnStartNamespaceDef - This is called at the start of a namespace 5202/// definition. 5203Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5204 SourceLocation InlineLoc, 5205 SourceLocation NamespaceLoc, 5206 SourceLocation IdentLoc, 5207 IdentifierInfo *II, 5208 SourceLocation LBrace, 5209 AttributeList *AttrList) { 5210 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5211 // For anonymous namespace, take the location of the left brace. 5212 SourceLocation Loc = II ? IdentLoc : LBrace; 5213 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 5214 StartLoc, Loc, II); 5215 Namespc->setInline(InlineLoc.isValid()); 5216 5217 Scope *DeclRegionScope = NamespcScope->getParent(); 5218 5219 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5220 5221 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5222 PushNamespaceVisibilityAttr(Attr); 5223 5224 if (II) { 5225 // C++ [namespace.def]p2: 5226 // The identifier in an original-namespace-definition shall not 5227 // have been previously defined in the declarative region in 5228 // which the original-namespace-definition appears. The 5229 // identifier in an original-namespace-definition is the name of 5230 // the namespace. Subsequently in that declarative region, it is 5231 // treated as an original-namespace-name. 5232 // 5233 // Since namespace names are unique in their scope, and we don't 5234 // look through using directives, just look for any ordinary names. 5235 5236 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5237 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5238 Decl::IDNS_Namespace; 5239 NamedDecl *PrevDecl = 0; 5240 for (DeclContext::lookup_result R 5241 = CurContext->getRedeclContext()->lookup(II); 5242 R.first != R.second; ++R.first) { 5243 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5244 PrevDecl = *R.first; 5245 break; 5246 } 5247 } 5248 5249 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 5250 // This is an extended namespace definition. 5251 if (Namespc->isInline() != OrigNS->isInline()) { 5252 // inline-ness must match 5253 if (OrigNS->isInline()) { 5254 // The user probably just forgot the 'inline', so suggest that it 5255 // be added back. 5256 Diag(Namespc->getLocation(), 5257 diag::warn_inline_namespace_reopened_noninline) 5258 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5259 } else { 5260 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5261 << Namespc->isInline(); 5262 } 5263 Diag(OrigNS->getLocation(), diag::note_previous_definition); 5264 5265 // Recover by ignoring the new namespace's inline status. 5266 Namespc->setInline(OrigNS->isInline()); 5267 } 5268 5269 // Attach this namespace decl to the chain of extended namespace 5270 // definitions. 5271 OrigNS->setNextNamespace(Namespc); 5272 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 5273 5274 // Remove the previous declaration from the scope. 5275 if (DeclRegionScope->isDeclScope(OrigNS)) { 5276 IdResolver.RemoveDecl(OrigNS); 5277 DeclRegionScope->RemoveDecl(OrigNS); 5278 } 5279 } else if (PrevDecl) { 5280 // This is an invalid name redefinition. 5281 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 5282 << Namespc->getDeclName(); 5283 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5284 Namespc->setInvalidDecl(); 5285 // Continue on to push Namespc as current DeclContext and return it. 5286 } else if (II->isStr("std") && 5287 CurContext->getRedeclContext()->isTranslationUnit()) { 5288 // This is the first "real" definition of the namespace "std", so update 5289 // our cache of the "std" namespace to point at this definition. 5290 if (NamespaceDecl *StdNS = getStdNamespace()) { 5291 // We had already defined a dummy namespace "std". Link this new 5292 // namespace definition to the dummy namespace "std". 5293 StdNS->setNextNamespace(Namespc); 5294 StdNS->setLocation(IdentLoc); 5295 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 5296 } 5297 5298 // Make our StdNamespace cache point at the first real definition of the 5299 // "std" namespace. 5300 StdNamespace = Namespc; 5301 5302 // Add this instance of "std" to the set of known namespaces 5303 KnownNamespaces[Namespc] = false; 5304 } else if (!Namespc->isInline()) { 5305 // Since this is an "original" namespace, add it to the known set of 5306 // namespaces if it is not an inline namespace. 5307 KnownNamespaces[Namespc] = false; 5308 } 5309 5310 PushOnScopeChains(Namespc, DeclRegionScope); 5311 } else { 5312 // Anonymous namespaces. 5313 assert(Namespc->isAnonymousNamespace()); 5314 5315 // Link the anonymous namespace into its parent. 5316 NamespaceDecl *PrevDecl; 5317 DeclContext *Parent = CurContext->getRedeclContext(); 5318 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5319 PrevDecl = TU->getAnonymousNamespace(); 5320 TU->setAnonymousNamespace(Namespc); 5321 } else { 5322 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5323 PrevDecl = ND->getAnonymousNamespace(); 5324 ND->setAnonymousNamespace(Namespc); 5325 } 5326 5327 // Link the anonymous namespace with its previous declaration. 5328 if (PrevDecl) { 5329 assert(PrevDecl->isAnonymousNamespace()); 5330 assert(!PrevDecl->getNextNamespace()); 5331 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 5332 PrevDecl->setNextNamespace(Namespc); 5333 5334 if (Namespc->isInline() != PrevDecl->isInline()) { 5335 // inline-ness must match 5336 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 5337 << Namespc->isInline(); 5338 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5339 Namespc->setInvalidDecl(); 5340 // Recover by ignoring the new namespace's inline status. 5341 Namespc->setInline(PrevDecl->isInline()); 5342 } 5343 } 5344 5345 CurContext->addDecl(Namespc); 5346 5347 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5348 // behaves as if it were replaced by 5349 // namespace unique { /* empty body */ } 5350 // using namespace unique; 5351 // namespace unique { namespace-body } 5352 // where all occurrences of 'unique' in a translation unit are 5353 // replaced by the same identifier and this identifier differs 5354 // from all other identifiers in the entire program. 5355 5356 // We just create the namespace with an empty name and then add an 5357 // implicit using declaration, just like the standard suggests. 5358 // 5359 // CodeGen enforces the "universally unique" aspect by giving all 5360 // declarations semantically contained within an anonymous 5361 // namespace internal linkage. 5362 5363 if (!PrevDecl) { 5364 UsingDirectiveDecl* UD 5365 = UsingDirectiveDecl::Create(Context, CurContext, 5366 /* 'using' */ LBrace, 5367 /* 'namespace' */ SourceLocation(), 5368 /* qualifier */ NestedNameSpecifierLoc(), 5369 /* identifier */ SourceLocation(), 5370 Namespc, 5371 /* Ancestor */ CurContext); 5372 UD->setImplicit(); 5373 CurContext->addDecl(UD); 5374 } 5375 } 5376 5377 // Although we could have an invalid decl (i.e. the namespace name is a 5378 // redefinition), push it as current DeclContext and try to continue parsing. 5379 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5380 // for the namespace has the declarations that showed up in that particular 5381 // namespace definition. 5382 PushDeclContext(NamespcScope, Namespc); 5383 return Namespc; 5384} 5385 5386/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5387/// is a namespace alias, returns the namespace it points to. 5388static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5389 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5390 return AD->getNamespace(); 5391 return dyn_cast_or_null<NamespaceDecl>(D); 5392} 5393 5394/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5395/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5396void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5397 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5398 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5399 Namespc->setRBraceLoc(RBrace); 5400 PopDeclContext(); 5401 if (Namespc->hasAttr<VisibilityAttr>()) 5402 PopPragmaVisibility(); 5403} 5404 5405CXXRecordDecl *Sema::getStdBadAlloc() const { 5406 return cast_or_null<CXXRecordDecl>( 5407 StdBadAlloc.get(Context.getExternalSource())); 5408} 5409 5410NamespaceDecl *Sema::getStdNamespace() const { 5411 return cast_or_null<NamespaceDecl>( 5412 StdNamespace.get(Context.getExternalSource())); 5413} 5414 5415/// \brief Retrieve the special "std" namespace, which may require us to 5416/// implicitly define the namespace. 5417NamespaceDecl *Sema::getOrCreateStdNamespace() { 5418 if (!StdNamespace) { 5419 // The "std" namespace has not yet been defined, so build one implicitly. 5420 StdNamespace = NamespaceDecl::Create(Context, 5421 Context.getTranslationUnitDecl(), 5422 SourceLocation(), SourceLocation(), 5423 &PP.getIdentifierTable().get("std")); 5424 getStdNamespace()->setImplicit(true); 5425 } 5426 5427 return getStdNamespace(); 5428} 5429 5430/// \brief Determine whether a using statement is in a context where it will be 5431/// apply in all contexts. 5432static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5433 switch (CurContext->getDeclKind()) { 5434 case Decl::TranslationUnit: 5435 return true; 5436 case Decl::LinkageSpec: 5437 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5438 default: 5439 return false; 5440 } 5441} 5442 5443static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5444 CXXScopeSpec &SS, 5445 SourceLocation IdentLoc, 5446 IdentifierInfo *Ident) { 5447 R.clear(); 5448 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5449 R.getLookupKind(), Sc, &SS, NULL, 5450 false, S.CTC_NoKeywords, NULL)) { 5451 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 5452 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 5453 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5454 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5455 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5456 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5457 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5458 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5459 else 5460 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5461 << Ident << CorrectedQuotedStr 5462 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5463 5464 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5465 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5466 5467 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5468 R.addDecl(Corrected.getCorrectionDecl()); 5469 return true; 5470 } 5471 R.setLookupName(Ident); 5472 } 5473 return false; 5474} 5475 5476Decl *Sema::ActOnUsingDirective(Scope *S, 5477 SourceLocation UsingLoc, 5478 SourceLocation NamespcLoc, 5479 CXXScopeSpec &SS, 5480 SourceLocation IdentLoc, 5481 IdentifierInfo *NamespcName, 5482 AttributeList *AttrList) { 5483 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5484 assert(NamespcName && "Invalid NamespcName."); 5485 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5486 5487 // This can only happen along a recovery path. 5488 while (S->getFlags() & Scope::TemplateParamScope) 5489 S = S->getParent(); 5490 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5491 5492 UsingDirectiveDecl *UDir = 0; 5493 NestedNameSpecifier *Qualifier = 0; 5494 if (SS.isSet()) 5495 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5496 5497 // Lookup namespace name. 5498 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5499 LookupParsedName(R, S, &SS); 5500 if (R.isAmbiguous()) 5501 return 0; 5502 5503 if (R.empty()) { 5504 R.clear(); 5505 // Allow "using namespace std;" or "using namespace ::std;" even if 5506 // "std" hasn't been defined yet, for GCC compatibility. 5507 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5508 NamespcName->isStr("std")) { 5509 Diag(IdentLoc, diag::ext_using_undefined_std); 5510 R.addDecl(getOrCreateStdNamespace()); 5511 R.resolveKind(); 5512 } 5513 // Otherwise, attempt typo correction. 5514 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5515 } 5516 5517 if (!R.empty()) { 5518 NamedDecl *Named = R.getFoundDecl(); 5519 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5520 && "expected namespace decl"); 5521 // C++ [namespace.udir]p1: 5522 // A using-directive specifies that the names in the nominated 5523 // namespace can be used in the scope in which the 5524 // using-directive appears after the using-directive. During 5525 // unqualified name lookup (3.4.1), the names appear as if they 5526 // were declared in the nearest enclosing namespace which 5527 // contains both the using-directive and the nominated 5528 // namespace. [Note: in this context, "contains" means "contains 5529 // directly or indirectly". ] 5530 5531 // Find enclosing context containing both using-directive and 5532 // nominated namespace. 5533 NamespaceDecl *NS = getNamespaceDecl(Named); 5534 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5535 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5536 CommonAncestor = CommonAncestor->getParent(); 5537 5538 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5539 SS.getWithLocInContext(Context), 5540 IdentLoc, Named, CommonAncestor); 5541 5542 if (IsUsingDirectiveInToplevelContext(CurContext) && 5543 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5544 Diag(IdentLoc, diag::warn_using_directive_in_header); 5545 } 5546 5547 PushUsingDirective(S, UDir); 5548 } else { 5549 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5550 } 5551 5552 // FIXME: We ignore attributes for now. 5553 return UDir; 5554} 5555 5556void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5557 // If scope has associated entity, then using directive is at namespace 5558 // or translation unit scope. We add UsingDirectiveDecls, into 5559 // it's lookup structure. 5560 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5561 Ctx->addDecl(UDir); 5562 else 5563 // Otherwise it is block-sope. using-directives will affect lookup 5564 // only to the end of scope. 5565 S->PushUsingDirective(UDir); 5566} 5567 5568 5569Decl *Sema::ActOnUsingDeclaration(Scope *S, 5570 AccessSpecifier AS, 5571 bool HasUsingKeyword, 5572 SourceLocation UsingLoc, 5573 CXXScopeSpec &SS, 5574 UnqualifiedId &Name, 5575 AttributeList *AttrList, 5576 bool IsTypeName, 5577 SourceLocation TypenameLoc) { 5578 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5579 5580 switch (Name.getKind()) { 5581 case UnqualifiedId::IK_ImplicitSelfParam: 5582 case UnqualifiedId::IK_Identifier: 5583 case UnqualifiedId::IK_OperatorFunctionId: 5584 case UnqualifiedId::IK_LiteralOperatorId: 5585 case UnqualifiedId::IK_ConversionFunctionId: 5586 break; 5587 5588 case UnqualifiedId::IK_ConstructorName: 5589 case UnqualifiedId::IK_ConstructorTemplateId: 5590 // C++0x inherited constructors. 5591 if (getLangOptions().CPlusPlus0x) break; 5592 5593 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5594 << SS.getRange(); 5595 return 0; 5596 5597 case UnqualifiedId::IK_DestructorName: 5598 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5599 << SS.getRange(); 5600 return 0; 5601 5602 case UnqualifiedId::IK_TemplateId: 5603 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5604 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5605 return 0; 5606 } 5607 5608 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5609 DeclarationName TargetName = TargetNameInfo.getName(); 5610 if (!TargetName) 5611 return 0; 5612 5613 // Warn about using declarations. 5614 // TODO: store that the declaration was written without 'using' and 5615 // talk about access decls instead of using decls in the 5616 // diagnostics. 5617 if (!HasUsingKeyword) { 5618 UsingLoc = Name.getSourceRange().getBegin(); 5619 5620 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5621 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5622 } 5623 5624 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5625 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5626 return 0; 5627 5628 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5629 TargetNameInfo, AttrList, 5630 /* IsInstantiation */ false, 5631 IsTypeName, TypenameLoc); 5632 if (UD) 5633 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5634 5635 return UD; 5636} 5637 5638/// \brief Determine whether a using declaration considers the given 5639/// declarations as "equivalent", e.g., if they are redeclarations of 5640/// the same entity or are both typedefs of the same type. 5641static bool 5642IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5643 bool &SuppressRedeclaration) { 5644 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5645 SuppressRedeclaration = false; 5646 return true; 5647 } 5648 5649 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5650 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5651 SuppressRedeclaration = true; 5652 return Context.hasSameType(TD1->getUnderlyingType(), 5653 TD2->getUnderlyingType()); 5654 } 5655 5656 return false; 5657} 5658 5659 5660/// Determines whether to create a using shadow decl for a particular 5661/// decl, given the set of decls existing prior to this using lookup. 5662bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5663 const LookupResult &Previous) { 5664 // Diagnose finding a decl which is not from a base class of the 5665 // current class. We do this now because there are cases where this 5666 // function will silently decide not to build a shadow decl, which 5667 // will pre-empt further diagnostics. 5668 // 5669 // We don't need to do this in C++0x because we do the check once on 5670 // the qualifier. 5671 // 5672 // FIXME: diagnose the following if we care enough: 5673 // struct A { int foo; }; 5674 // struct B : A { using A::foo; }; 5675 // template <class T> struct C : A {}; 5676 // template <class T> struct D : C<T> { using B::foo; } // <--- 5677 // This is invalid (during instantiation) in C++03 because B::foo 5678 // resolves to the using decl in B, which is not a base class of D<T>. 5679 // We can't diagnose it immediately because C<T> is an unknown 5680 // specialization. The UsingShadowDecl in D<T> then points directly 5681 // to A::foo, which will look well-formed when we instantiate. 5682 // The right solution is to not collapse the shadow-decl chain. 5683 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5684 DeclContext *OrigDC = Orig->getDeclContext(); 5685 5686 // Handle enums and anonymous structs. 5687 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5688 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5689 while (OrigRec->isAnonymousStructOrUnion()) 5690 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5691 5692 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5693 if (OrigDC == CurContext) { 5694 Diag(Using->getLocation(), 5695 diag::err_using_decl_nested_name_specifier_is_current_class) 5696 << Using->getQualifierLoc().getSourceRange(); 5697 Diag(Orig->getLocation(), diag::note_using_decl_target); 5698 return true; 5699 } 5700 5701 Diag(Using->getQualifierLoc().getBeginLoc(), 5702 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5703 << Using->getQualifier() 5704 << cast<CXXRecordDecl>(CurContext) 5705 << Using->getQualifierLoc().getSourceRange(); 5706 Diag(Orig->getLocation(), diag::note_using_decl_target); 5707 return true; 5708 } 5709 } 5710 5711 if (Previous.empty()) return false; 5712 5713 NamedDecl *Target = Orig; 5714 if (isa<UsingShadowDecl>(Target)) 5715 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5716 5717 // If the target happens to be one of the previous declarations, we 5718 // don't have a conflict. 5719 // 5720 // FIXME: but we might be increasing its access, in which case we 5721 // should redeclare it. 5722 NamedDecl *NonTag = 0, *Tag = 0; 5723 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5724 I != E; ++I) { 5725 NamedDecl *D = (*I)->getUnderlyingDecl(); 5726 bool Result; 5727 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5728 return Result; 5729 5730 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5731 } 5732 5733 if (Target->isFunctionOrFunctionTemplate()) { 5734 FunctionDecl *FD; 5735 if (isa<FunctionTemplateDecl>(Target)) 5736 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5737 else 5738 FD = cast<FunctionDecl>(Target); 5739 5740 NamedDecl *OldDecl = 0; 5741 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5742 case Ovl_Overload: 5743 return false; 5744 5745 case Ovl_NonFunction: 5746 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5747 break; 5748 5749 // We found a decl with the exact signature. 5750 case Ovl_Match: 5751 // If we're in a record, we want to hide the target, so we 5752 // return true (without a diagnostic) to tell the caller not to 5753 // build a shadow decl. 5754 if (CurContext->isRecord()) 5755 return true; 5756 5757 // If we're not in a record, this is an error. 5758 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5759 break; 5760 } 5761 5762 Diag(Target->getLocation(), diag::note_using_decl_target); 5763 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5764 return true; 5765 } 5766 5767 // Target is not a function. 5768 5769 if (isa<TagDecl>(Target)) { 5770 // No conflict between a tag and a non-tag. 5771 if (!Tag) return false; 5772 5773 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5774 Diag(Target->getLocation(), diag::note_using_decl_target); 5775 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5776 return true; 5777 } 5778 5779 // No conflict between a tag and a non-tag. 5780 if (!NonTag) return false; 5781 5782 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5783 Diag(Target->getLocation(), diag::note_using_decl_target); 5784 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5785 return true; 5786} 5787 5788/// Builds a shadow declaration corresponding to a 'using' declaration. 5789UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5790 UsingDecl *UD, 5791 NamedDecl *Orig) { 5792 5793 // If we resolved to another shadow declaration, just coalesce them. 5794 NamedDecl *Target = Orig; 5795 if (isa<UsingShadowDecl>(Target)) { 5796 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5797 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5798 } 5799 5800 UsingShadowDecl *Shadow 5801 = UsingShadowDecl::Create(Context, CurContext, 5802 UD->getLocation(), UD, Target); 5803 UD->addShadowDecl(Shadow); 5804 5805 Shadow->setAccess(UD->getAccess()); 5806 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5807 Shadow->setInvalidDecl(); 5808 5809 if (S) 5810 PushOnScopeChains(Shadow, S); 5811 else 5812 CurContext->addDecl(Shadow); 5813 5814 5815 return Shadow; 5816} 5817 5818/// Hides a using shadow declaration. This is required by the current 5819/// using-decl implementation when a resolvable using declaration in a 5820/// class is followed by a declaration which would hide or override 5821/// one or more of the using decl's targets; for example: 5822/// 5823/// struct Base { void foo(int); }; 5824/// struct Derived : Base { 5825/// using Base::foo; 5826/// void foo(int); 5827/// }; 5828/// 5829/// The governing language is C++03 [namespace.udecl]p12: 5830/// 5831/// When a using-declaration brings names from a base class into a 5832/// derived class scope, member functions in the derived class 5833/// override and/or hide member functions with the same name and 5834/// parameter types in a base class (rather than conflicting). 5835/// 5836/// There are two ways to implement this: 5837/// (1) optimistically create shadow decls when they're not hidden 5838/// by existing declarations, or 5839/// (2) don't create any shadow decls (or at least don't make them 5840/// visible) until we've fully parsed/instantiated the class. 5841/// The problem with (1) is that we might have to retroactively remove 5842/// a shadow decl, which requires several O(n) operations because the 5843/// decl structures are (very reasonably) not designed for removal. 5844/// (2) avoids this but is very fiddly and phase-dependent. 5845void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5846 if (Shadow->getDeclName().getNameKind() == 5847 DeclarationName::CXXConversionFunctionName) 5848 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5849 5850 // Remove it from the DeclContext... 5851 Shadow->getDeclContext()->removeDecl(Shadow); 5852 5853 // ...and the scope, if applicable... 5854 if (S) { 5855 S->RemoveDecl(Shadow); 5856 IdResolver.RemoveDecl(Shadow); 5857 } 5858 5859 // ...and the using decl. 5860 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5861 5862 // TODO: complain somehow if Shadow was used. It shouldn't 5863 // be possible for this to happen, because...? 5864} 5865 5866/// Builds a using declaration. 5867/// 5868/// \param IsInstantiation - Whether this call arises from an 5869/// instantiation of an unresolved using declaration. We treat 5870/// the lookup differently for these declarations. 5871NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5872 SourceLocation UsingLoc, 5873 CXXScopeSpec &SS, 5874 const DeclarationNameInfo &NameInfo, 5875 AttributeList *AttrList, 5876 bool IsInstantiation, 5877 bool IsTypeName, 5878 SourceLocation TypenameLoc) { 5879 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5880 SourceLocation IdentLoc = NameInfo.getLoc(); 5881 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5882 5883 // FIXME: We ignore attributes for now. 5884 5885 if (SS.isEmpty()) { 5886 Diag(IdentLoc, diag::err_using_requires_qualname); 5887 return 0; 5888 } 5889 5890 // Do the redeclaration lookup in the current scope. 5891 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5892 ForRedeclaration); 5893 Previous.setHideTags(false); 5894 if (S) { 5895 LookupName(Previous, S); 5896 5897 // It is really dumb that we have to do this. 5898 LookupResult::Filter F = Previous.makeFilter(); 5899 while (F.hasNext()) { 5900 NamedDecl *D = F.next(); 5901 if (!isDeclInScope(D, CurContext, S)) 5902 F.erase(); 5903 } 5904 F.done(); 5905 } else { 5906 assert(IsInstantiation && "no scope in non-instantiation"); 5907 assert(CurContext->isRecord() && "scope not record in instantiation"); 5908 LookupQualifiedName(Previous, CurContext); 5909 } 5910 5911 // Check for invalid redeclarations. 5912 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5913 return 0; 5914 5915 // Check for bad qualifiers. 5916 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5917 return 0; 5918 5919 DeclContext *LookupContext = computeDeclContext(SS); 5920 NamedDecl *D; 5921 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5922 if (!LookupContext) { 5923 if (IsTypeName) { 5924 // FIXME: not all declaration name kinds are legal here 5925 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5926 UsingLoc, TypenameLoc, 5927 QualifierLoc, 5928 IdentLoc, NameInfo.getName()); 5929 } else { 5930 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5931 QualifierLoc, NameInfo); 5932 } 5933 } else { 5934 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5935 NameInfo, IsTypeName); 5936 } 5937 D->setAccess(AS); 5938 CurContext->addDecl(D); 5939 5940 if (!LookupContext) return D; 5941 UsingDecl *UD = cast<UsingDecl>(D); 5942 5943 if (RequireCompleteDeclContext(SS, LookupContext)) { 5944 UD->setInvalidDecl(); 5945 return UD; 5946 } 5947 5948 // Constructor inheriting using decls get special treatment. 5949 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5950 if (CheckInheritedConstructorUsingDecl(UD)) 5951 UD->setInvalidDecl(); 5952 return UD; 5953 } 5954 5955 // Otherwise, look up the target name. 5956 5957 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5958 5959 // Unlike most lookups, we don't always want to hide tag 5960 // declarations: tag names are visible through the using declaration 5961 // even if hidden by ordinary names, *except* in a dependent context 5962 // where it's important for the sanity of two-phase lookup. 5963 if (!IsInstantiation) 5964 R.setHideTags(false); 5965 5966 LookupQualifiedName(R, LookupContext); 5967 5968 if (R.empty()) { 5969 Diag(IdentLoc, diag::err_no_member) 5970 << NameInfo.getName() << LookupContext << SS.getRange(); 5971 UD->setInvalidDecl(); 5972 return UD; 5973 } 5974 5975 if (R.isAmbiguous()) { 5976 UD->setInvalidDecl(); 5977 return UD; 5978 } 5979 5980 if (IsTypeName) { 5981 // If we asked for a typename and got a non-type decl, error out. 5982 if (!R.getAsSingle<TypeDecl>()) { 5983 Diag(IdentLoc, diag::err_using_typename_non_type); 5984 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5985 Diag((*I)->getUnderlyingDecl()->getLocation(), 5986 diag::note_using_decl_target); 5987 UD->setInvalidDecl(); 5988 return UD; 5989 } 5990 } else { 5991 // If we asked for a non-typename and we got a type, error out, 5992 // but only if this is an instantiation of an unresolved using 5993 // decl. Otherwise just silently find the type name. 5994 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5995 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5996 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5997 UD->setInvalidDecl(); 5998 return UD; 5999 } 6000 } 6001 6002 // C++0x N2914 [namespace.udecl]p6: 6003 // A using-declaration shall not name a namespace. 6004 if (R.getAsSingle<NamespaceDecl>()) { 6005 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6006 << SS.getRange(); 6007 UD->setInvalidDecl(); 6008 return UD; 6009 } 6010 6011 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6012 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6013 BuildUsingShadowDecl(S, UD, *I); 6014 } 6015 6016 return UD; 6017} 6018 6019/// Additional checks for a using declaration referring to a constructor name. 6020bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6021 if (UD->isTypeName()) { 6022 // FIXME: Cannot specify typename when specifying constructor 6023 return true; 6024 } 6025 6026 const Type *SourceType = UD->getQualifier()->getAsType(); 6027 assert(SourceType && 6028 "Using decl naming constructor doesn't have type in scope spec."); 6029 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6030 6031 // Check whether the named type is a direct base class. 6032 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6033 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6034 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6035 BaseIt != BaseE; ++BaseIt) { 6036 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6037 if (CanonicalSourceType == BaseType) 6038 break; 6039 } 6040 6041 if (BaseIt == BaseE) { 6042 // Did not find SourceType in the bases. 6043 Diag(UD->getUsingLocation(), 6044 diag::err_using_decl_constructor_not_in_direct_base) 6045 << UD->getNameInfo().getSourceRange() 6046 << QualType(SourceType, 0) << TargetClass; 6047 return true; 6048 } 6049 6050 BaseIt->setInheritConstructors(); 6051 6052 return false; 6053} 6054 6055/// Checks that the given using declaration is not an invalid 6056/// redeclaration. Note that this is checking only for the using decl 6057/// itself, not for any ill-formedness among the UsingShadowDecls. 6058bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6059 bool isTypeName, 6060 const CXXScopeSpec &SS, 6061 SourceLocation NameLoc, 6062 const LookupResult &Prev) { 6063 // C++03 [namespace.udecl]p8: 6064 // C++0x [namespace.udecl]p10: 6065 // A using-declaration is a declaration and can therefore be used 6066 // repeatedly where (and only where) multiple declarations are 6067 // allowed. 6068 // 6069 // That's in non-member contexts. 6070 if (!CurContext->getRedeclContext()->isRecord()) 6071 return false; 6072 6073 NestedNameSpecifier *Qual 6074 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6075 6076 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6077 NamedDecl *D = *I; 6078 6079 bool DTypename; 6080 NestedNameSpecifier *DQual; 6081 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6082 DTypename = UD->isTypeName(); 6083 DQual = UD->getQualifier(); 6084 } else if (UnresolvedUsingValueDecl *UD 6085 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6086 DTypename = false; 6087 DQual = UD->getQualifier(); 6088 } else if (UnresolvedUsingTypenameDecl *UD 6089 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6090 DTypename = true; 6091 DQual = UD->getQualifier(); 6092 } else continue; 6093 6094 // using decls differ if one says 'typename' and the other doesn't. 6095 // FIXME: non-dependent using decls? 6096 if (isTypeName != DTypename) continue; 6097 6098 // using decls differ if they name different scopes (but note that 6099 // template instantiation can cause this check to trigger when it 6100 // didn't before instantiation). 6101 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6102 Context.getCanonicalNestedNameSpecifier(DQual)) 6103 continue; 6104 6105 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6106 Diag(D->getLocation(), diag::note_using_decl) << 1; 6107 return true; 6108 } 6109 6110 return false; 6111} 6112 6113 6114/// Checks that the given nested-name qualifier used in a using decl 6115/// in the current context is appropriately related to the current 6116/// scope. If an error is found, diagnoses it and returns true. 6117bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6118 const CXXScopeSpec &SS, 6119 SourceLocation NameLoc) { 6120 DeclContext *NamedContext = computeDeclContext(SS); 6121 6122 if (!CurContext->isRecord()) { 6123 // C++03 [namespace.udecl]p3: 6124 // C++0x [namespace.udecl]p8: 6125 // A using-declaration for a class member shall be a member-declaration. 6126 6127 // If we weren't able to compute a valid scope, it must be a 6128 // dependent class scope. 6129 if (!NamedContext || NamedContext->isRecord()) { 6130 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6131 << SS.getRange(); 6132 return true; 6133 } 6134 6135 // Otherwise, everything is known to be fine. 6136 return false; 6137 } 6138 6139 // The current scope is a record. 6140 6141 // If the named context is dependent, we can't decide much. 6142 if (!NamedContext) { 6143 // FIXME: in C++0x, we can diagnose if we can prove that the 6144 // nested-name-specifier does not refer to a base class, which is 6145 // still possible in some cases. 6146 6147 // Otherwise we have to conservatively report that things might be 6148 // okay. 6149 return false; 6150 } 6151 6152 if (!NamedContext->isRecord()) { 6153 // Ideally this would point at the last name in the specifier, 6154 // but we don't have that level of source info. 6155 Diag(SS.getRange().getBegin(), 6156 diag::err_using_decl_nested_name_specifier_is_not_class) 6157 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6158 return true; 6159 } 6160 6161 if (!NamedContext->isDependentContext() && 6162 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6163 return true; 6164 6165 if (getLangOptions().CPlusPlus0x) { 6166 // C++0x [namespace.udecl]p3: 6167 // In a using-declaration used as a member-declaration, the 6168 // nested-name-specifier shall name a base class of the class 6169 // being defined. 6170 6171 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6172 cast<CXXRecordDecl>(NamedContext))) { 6173 if (CurContext == NamedContext) { 6174 Diag(NameLoc, 6175 diag::err_using_decl_nested_name_specifier_is_current_class) 6176 << SS.getRange(); 6177 return true; 6178 } 6179 6180 Diag(SS.getRange().getBegin(), 6181 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6182 << (NestedNameSpecifier*) SS.getScopeRep() 6183 << cast<CXXRecordDecl>(CurContext) 6184 << SS.getRange(); 6185 return true; 6186 } 6187 6188 return false; 6189 } 6190 6191 // C++03 [namespace.udecl]p4: 6192 // A using-declaration used as a member-declaration shall refer 6193 // to a member of a base class of the class being defined [etc.]. 6194 6195 // Salient point: SS doesn't have to name a base class as long as 6196 // lookup only finds members from base classes. Therefore we can 6197 // diagnose here only if we can prove that that can't happen, 6198 // i.e. if the class hierarchies provably don't intersect. 6199 6200 // TODO: it would be nice if "definitely valid" results were cached 6201 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6202 // need to be repeated. 6203 6204 struct UserData { 6205 llvm::DenseSet<const CXXRecordDecl*> Bases; 6206 6207 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6208 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6209 Data->Bases.insert(Base); 6210 return true; 6211 } 6212 6213 bool hasDependentBases(const CXXRecordDecl *Class) { 6214 return !Class->forallBases(collect, this); 6215 } 6216 6217 /// Returns true if the base is dependent or is one of the 6218 /// accumulated base classes. 6219 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6220 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6221 return !Data->Bases.count(Base); 6222 } 6223 6224 bool mightShareBases(const CXXRecordDecl *Class) { 6225 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6226 } 6227 }; 6228 6229 UserData Data; 6230 6231 // Returns false if we find a dependent base. 6232 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6233 return false; 6234 6235 // Returns false if the class has a dependent base or if it or one 6236 // of its bases is present in the base set of the current context. 6237 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6238 return false; 6239 6240 Diag(SS.getRange().getBegin(), 6241 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6242 << (NestedNameSpecifier*) SS.getScopeRep() 6243 << cast<CXXRecordDecl>(CurContext) 6244 << SS.getRange(); 6245 6246 return true; 6247} 6248 6249Decl *Sema::ActOnAliasDeclaration(Scope *S, 6250 AccessSpecifier AS, 6251 MultiTemplateParamsArg TemplateParamLists, 6252 SourceLocation UsingLoc, 6253 UnqualifiedId &Name, 6254 TypeResult Type) { 6255 // Skip up to the relevant declaration scope. 6256 while (S->getFlags() & Scope::TemplateParamScope) 6257 S = S->getParent(); 6258 assert((S->getFlags() & Scope::DeclScope) && 6259 "got alias-declaration outside of declaration scope"); 6260 6261 if (Type.isInvalid()) 6262 return 0; 6263 6264 bool Invalid = false; 6265 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6266 TypeSourceInfo *TInfo = 0; 6267 GetTypeFromParser(Type.get(), &TInfo); 6268 6269 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6270 return 0; 6271 6272 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6273 UPPC_DeclarationType)) { 6274 Invalid = true; 6275 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6276 TInfo->getTypeLoc().getBeginLoc()); 6277 } 6278 6279 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6280 LookupName(Previous, S); 6281 6282 // Warn about shadowing the name of a template parameter. 6283 if (Previous.isSingleResult() && 6284 Previous.getFoundDecl()->isTemplateParameter()) { 6285 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 6286 Previous.getFoundDecl())) 6287 Invalid = true; 6288 Previous.clear(); 6289 } 6290 6291 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6292 "name in alias declaration must be an identifier"); 6293 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6294 Name.StartLocation, 6295 Name.Identifier, TInfo); 6296 6297 NewTD->setAccess(AS); 6298 6299 if (Invalid) 6300 NewTD->setInvalidDecl(); 6301 6302 CheckTypedefForVariablyModifiedType(S, NewTD); 6303 Invalid |= NewTD->isInvalidDecl(); 6304 6305 bool Redeclaration = false; 6306 6307 NamedDecl *NewND; 6308 if (TemplateParamLists.size()) { 6309 TypeAliasTemplateDecl *OldDecl = 0; 6310 TemplateParameterList *OldTemplateParams = 0; 6311 6312 if (TemplateParamLists.size() != 1) { 6313 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6314 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6315 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6316 } 6317 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6318 6319 // Only consider previous declarations in the same scope. 6320 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6321 /*ExplicitInstantiationOrSpecialization*/false); 6322 if (!Previous.empty()) { 6323 Redeclaration = true; 6324 6325 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6326 if (!OldDecl && !Invalid) { 6327 Diag(UsingLoc, diag::err_redefinition_different_kind) 6328 << Name.Identifier; 6329 6330 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6331 if (OldD->getLocation().isValid()) 6332 Diag(OldD->getLocation(), diag::note_previous_definition); 6333 6334 Invalid = true; 6335 } 6336 6337 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6338 if (TemplateParameterListsAreEqual(TemplateParams, 6339 OldDecl->getTemplateParameters(), 6340 /*Complain=*/true, 6341 TPL_TemplateMatch)) 6342 OldTemplateParams = OldDecl->getTemplateParameters(); 6343 else 6344 Invalid = true; 6345 6346 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6347 if (!Invalid && 6348 !Context.hasSameType(OldTD->getUnderlyingType(), 6349 NewTD->getUnderlyingType())) { 6350 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6351 // but we can't reasonably accept it. 6352 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6353 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6354 if (OldTD->getLocation().isValid()) 6355 Diag(OldTD->getLocation(), diag::note_previous_definition); 6356 Invalid = true; 6357 } 6358 } 6359 } 6360 6361 // Merge any previous default template arguments into our parameters, 6362 // and check the parameter list. 6363 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6364 TPC_TypeAliasTemplate)) 6365 return 0; 6366 6367 TypeAliasTemplateDecl *NewDecl = 6368 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6369 Name.Identifier, TemplateParams, 6370 NewTD); 6371 6372 NewDecl->setAccess(AS); 6373 6374 if (Invalid) 6375 NewDecl->setInvalidDecl(); 6376 else if (OldDecl) 6377 NewDecl->setPreviousDeclaration(OldDecl); 6378 6379 NewND = NewDecl; 6380 } else { 6381 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6382 NewND = NewTD; 6383 } 6384 6385 if (!Redeclaration) 6386 PushOnScopeChains(NewND, S); 6387 6388 return NewND; 6389} 6390 6391Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6392 SourceLocation NamespaceLoc, 6393 SourceLocation AliasLoc, 6394 IdentifierInfo *Alias, 6395 CXXScopeSpec &SS, 6396 SourceLocation IdentLoc, 6397 IdentifierInfo *Ident) { 6398 6399 // Lookup the namespace name. 6400 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6401 LookupParsedName(R, S, &SS); 6402 6403 // Check if we have a previous declaration with the same name. 6404 NamedDecl *PrevDecl 6405 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6406 ForRedeclaration); 6407 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6408 PrevDecl = 0; 6409 6410 if (PrevDecl) { 6411 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6412 // We already have an alias with the same name that points to the same 6413 // namespace, so don't create a new one. 6414 // FIXME: At some point, we'll want to create the (redundant) 6415 // declaration to maintain better source information. 6416 if (!R.isAmbiguous() && !R.empty() && 6417 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6418 return 0; 6419 } 6420 6421 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6422 diag::err_redefinition_different_kind; 6423 Diag(AliasLoc, DiagID) << Alias; 6424 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6425 return 0; 6426 } 6427 6428 if (R.isAmbiguous()) 6429 return 0; 6430 6431 if (R.empty()) { 6432 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6433 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6434 return 0; 6435 } 6436 } 6437 6438 NamespaceAliasDecl *AliasDecl = 6439 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6440 Alias, SS.getWithLocInContext(Context), 6441 IdentLoc, R.getFoundDecl()); 6442 6443 PushOnScopeChains(AliasDecl, S); 6444 return AliasDecl; 6445} 6446 6447namespace { 6448 /// \brief Scoped object used to handle the state changes required in Sema 6449 /// to implicitly define the body of a C++ member function; 6450 class ImplicitlyDefinedFunctionScope { 6451 Sema &S; 6452 Sema::ContextRAII SavedContext; 6453 6454 public: 6455 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6456 : S(S), SavedContext(S, Method) 6457 { 6458 S.PushFunctionScope(); 6459 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6460 } 6461 6462 ~ImplicitlyDefinedFunctionScope() { 6463 S.PopExpressionEvaluationContext(); 6464 S.PopFunctionOrBlockScope(); 6465 } 6466 }; 6467} 6468 6469Sema::ImplicitExceptionSpecification 6470Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6471 // C++ [except.spec]p14: 6472 // An implicitly declared special member function (Clause 12) shall have an 6473 // exception-specification. [...] 6474 ImplicitExceptionSpecification ExceptSpec(Context); 6475 if (ClassDecl->isInvalidDecl()) 6476 return ExceptSpec; 6477 6478 // Direct base-class constructors. 6479 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6480 BEnd = ClassDecl->bases_end(); 6481 B != BEnd; ++B) { 6482 if (B->isVirtual()) // Handled below. 6483 continue; 6484 6485 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6486 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6487 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6488 // If this is a deleted function, add it anyway. This might be conformant 6489 // with the standard. This might not. I'm not sure. It might not matter. 6490 if (Constructor) 6491 ExceptSpec.CalledDecl(Constructor); 6492 } 6493 } 6494 6495 // Virtual base-class constructors. 6496 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6497 BEnd = ClassDecl->vbases_end(); 6498 B != BEnd; ++B) { 6499 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6500 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6501 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6502 // If this is a deleted function, add it anyway. This might be conformant 6503 // with the standard. This might not. I'm not sure. It might not matter. 6504 if (Constructor) 6505 ExceptSpec.CalledDecl(Constructor); 6506 } 6507 } 6508 6509 // Field constructors. 6510 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6511 FEnd = ClassDecl->field_end(); 6512 F != FEnd; ++F) { 6513 if (F->hasInClassInitializer()) { 6514 if (Expr *E = F->getInClassInitializer()) 6515 ExceptSpec.CalledExpr(E); 6516 else if (!F->isInvalidDecl()) 6517 ExceptSpec.SetDelayed(); 6518 } else if (const RecordType *RecordTy 6519 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6520 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6521 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6522 // If this is a deleted function, add it anyway. This might be conformant 6523 // with the standard. This might not. I'm not sure. It might not matter. 6524 // In particular, the problem is that this function never gets called. It 6525 // might just be ill-formed because this function attempts to refer to 6526 // a deleted function here. 6527 if (Constructor) 6528 ExceptSpec.CalledDecl(Constructor); 6529 } 6530 } 6531 6532 return ExceptSpec; 6533} 6534 6535CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6536 CXXRecordDecl *ClassDecl) { 6537 // C++ [class.ctor]p5: 6538 // A default constructor for a class X is a constructor of class X 6539 // that can be called without an argument. If there is no 6540 // user-declared constructor for class X, a default constructor is 6541 // implicitly declared. An implicitly-declared default constructor 6542 // is an inline public member of its class. 6543 assert(!ClassDecl->hasUserDeclaredConstructor() && 6544 "Should not build implicit default constructor!"); 6545 6546 ImplicitExceptionSpecification Spec = 6547 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6548 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6549 6550 // Create the actual constructor declaration. 6551 CanQualType ClassType 6552 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6553 SourceLocation ClassLoc = ClassDecl->getLocation(); 6554 DeclarationName Name 6555 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6556 DeclarationNameInfo NameInfo(Name, ClassLoc); 6557 CXXConstructorDecl *DefaultCon 6558 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6559 Context.getFunctionType(Context.VoidTy, 6560 0, 0, EPI), 6561 /*TInfo=*/0, 6562 /*isExplicit=*/false, 6563 /*isInline=*/true, 6564 /*isImplicitlyDeclared=*/true, 6565 // FIXME: apply the rules for definitions here 6566 /*isConstexpr=*/false); 6567 DefaultCon->setAccess(AS_public); 6568 DefaultCon->setDefaulted(); 6569 DefaultCon->setImplicit(); 6570 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6571 6572 // Note that we have declared this constructor. 6573 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6574 6575 if (Scope *S = getScopeForContext(ClassDecl)) 6576 PushOnScopeChains(DefaultCon, S, false); 6577 ClassDecl->addDecl(DefaultCon); 6578 6579 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6580 DefaultCon->setDeletedAsWritten(); 6581 6582 return DefaultCon; 6583} 6584 6585void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6586 CXXConstructorDecl *Constructor) { 6587 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6588 !Constructor->doesThisDeclarationHaveABody() && 6589 !Constructor->isDeleted()) && 6590 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6591 6592 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6593 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6594 6595 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6596 DiagnosticErrorTrap Trap(Diags); 6597 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6598 Trap.hasErrorOccurred()) { 6599 Diag(CurrentLocation, diag::note_member_synthesized_at) 6600 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6601 Constructor->setInvalidDecl(); 6602 return; 6603 } 6604 6605 SourceLocation Loc = Constructor->getLocation(); 6606 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6607 6608 Constructor->setUsed(); 6609 MarkVTableUsed(CurrentLocation, ClassDecl); 6610 6611 if (ASTMutationListener *L = getASTMutationListener()) { 6612 L->CompletedImplicitDefinition(Constructor); 6613 } 6614} 6615 6616/// Get any existing defaulted default constructor for the given class. Do not 6617/// implicitly define one if it does not exist. 6618static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6619 CXXRecordDecl *D) { 6620 ASTContext &Context = Self.Context; 6621 QualType ClassType = Context.getTypeDeclType(D); 6622 DeclarationName ConstructorName 6623 = Context.DeclarationNames.getCXXConstructorName( 6624 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6625 6626 DeclContext::lookup_const_iterator Con, ConEnd; 6627 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6628 Con != ConEnd; ++Con) { 6629 // A function template cannot be defaulted. 6630 if (isa<FunctionTemplateDecl>(*Con)) 6631 continue; 6632 6633 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6634 if (Constructor->isDefaultConstructor()) 6635 return Constructor->isDefaulted() ? Constructor : 0; 6636 } 6637 return 0; 6638} 6639 6640void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6641 if (!D) return; 6642 AdjustDeclIfTemplate(D); 6643 6644 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6645 CXXConstructorDecl *CtorDecl 6646 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6647 6648 if (!CtorDecl) return; 6649 6650 // Compute the exception specification for the default constructor. 6651 const FunctionProtoType *CtorTy = 6652 CtorDecl->getType()->castAs<FunctionProtoType>(); 6653 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6654 ImplicitExceptionSpecification Spec = 6655 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6656 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6657 assert(EPI.ExceptionSpecType != EST_Delayed); 6658 6659 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6660 } 6661 6662 // If the default constructor is explicitly defaulted, checking the exception 6663 // specification is deferred until now. 6664 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6665 !ClassDecl->isDependentType()) 6666 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6667} 6668 6669void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6670 // We start with an initial pass over the base classes to collect those that 6671 // inherit constructors from. If there are none, we can forgo all further 6672 // processing. 6673 typedef SmallVector<const RecordType *, 4> BasesVector; 6674 BasesVector BasesToInheritFrom; 6675 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6676 BaseE = ClassDecl->bases_end(); 6677 BaseIt != BaseE; ++BaseIt) { 6678 if (BaseIt->getInheritConstructors()) { 6679 QualType Base = BaseIt->getType(); 6680 if (Base->isDependentType()) { 6681 // If we inherit constructors from anything that is dependent, just 6682 // abort processing altogether. We'll get another chance for the 6683 // instantiations. 6684 return; 6685 } 6686 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6687 } 6688 } 6689 if (BasesToInheritFrom.empty()) 6690 return; 6691 6692 // Now collect the constructors that we already have in the current class. 6693 // Those take precedence over inherited constructors. 6694 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6695 // unless there is a user-declared constructor with the same signature in 6696 // the class where the using-declaration appears. 6697 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6698 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6699 CtorE = ClassDecl->ctor_end(); 6700 CtorIt != CtorE; ++CtorIt) { 6701 ExistingConstructors.insert( 6702 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6703 } 6704 6705 Scope *S = getScopeForContext(ClassDecl); 6706 DeclarationName CreatedCtorName = 6707 Context.DeclarationNames.getCXXConstructorName( 6708 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6709 6710 // Now comes the true work. 6711 // First, we keep a map from constructor types to the base that introduced 6712 // them. Needed for finding conflicting constructors. We also keep the 6713 // actually inserted declarations in there, for pretty diagnostics. 6714 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6715 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6716 ConstructorToSourceMap InheritedConstructors; 6717 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6718 BaseE = BasesToInheritFrom.end(); 6719 BaseIt != BaseE; ++BaseIt) { 6720 const RecordType *Base = *BaseIt; 6721 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6722 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6723 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6724 CtorE = BaseDecl->ctor_end(); 6725 CtorIt != CtorE; ++CtorIt) { 6726 // Find the using declaration for inheriting this base's constructors. 6727 DeclarationName Name = 6728 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6729 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6730 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6731 SourceLocation UsingLoc = UD ? UD->getLocation() : 6732 ClassDecl->getLocation(); 6733 6734 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6735 // from the class X named in the using-declaration consists of actual 6736 // constructors and notional constructors that result from the 6737 // transformation of defaulted parameters as follows: 6738 // - all non-template default constructors of X, and 6739 // - for each non-template constructor of X that has at least one 6740 // parameter with a default argument, the set of constructors that 6741 // results from omitting any ellipsis parameter specification and 6742 // successively omitting parameters with a default argument from the 6743 // end of the parameter-type-list. 6744 CXXConstructorDecl *BaseCtor = *CtorIt; 6745 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6746 const FunctionProtoType *BaseCtorType = 6747 BaseCtor->getType()->getAs<FunctionProtoType>(); 6748 6749 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6750 maxParams = BaseCtor->getNumParams(); 6751 params <= maxParams; ++params) { 6752 // Skip default constructors. They're never inherited. 6753 if (params == 0) 6754 continue; 6755 // Skip copy and move constructors for the same reason. 6756 if (CanBeCopyOrMove && params == 1) 6757 continue; 6758 6759 // Build up a function type for this particular constructor. 6760 // FIXME: The working paper does not consider that the exception spec 6761 // for the inheriting constructor might be larger than that of the 6762 // source. This code doesn't yet, either. When it does, this code will 6763 // need to be delayed until after exception specifications and in-class 6764 // member initializers are attached. 6765 const Type *NewCtorType; 6766 if (params == maxParams) 6767 NewCtorType = BaseCtorType; 6768 else { 6769 SmallVector<QualType, 16> Args; 6770 for (unsigned i = 0; i < params; ++i) { 6771 Args.push_back(BaseCtorType->getArgType(i)); 6772 } 6773 FunctionProtoType::ExtProtoInfo ExtInfo = 6774 BaseCtorType->getExtProtoInfo(); 6775 ExtInfo.Variadic = false; 6776 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6777 Args.data(), params, ExtInfo) 6778 .getTypePtr(); 6779 } 6780 const Type *CanonicalNewCtorType = 6781 Context.getCanonicalType(NewCtorType); 6782 6783 // Now that we have the type, first check if the class already has a 6784 // constructor with this signature. 6785 if (ExistingConstructors.count(CanonicalNewCtorType)) 6786 continue; 6787 6788 // Then we check if we have already declared an inherited constructor 6789 // with this signature. 6790 std::pair<ConstructorToSourceMap::iterator, bool> result = 6791 InheritedConstructors.insert(std::make_pair( 6792 CanonicalNewCtorType, 6793 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6794 if (!result.second) { 6795 // Already in the map. If it came from a different class, that's an 6796 // error. Not if it's from the same. 6797 CanQualType PreviousBase = result.first->second.first; 6798 if (CanonicalBase != PreviousBase) { 6799 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6800 const CXXConstructorDecl *PrevBaseCtor = 6801 PrevCtor->getInheritedConstructor(); 6802 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6803 6804 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6805 Diag(BaseCtor->getLocation(), 6806 diag::note_using_decl_constructor_conflict_current_ctor); 6807 Diag(PrevBaseCtor->getLocation(), 6808 diag::note_using_decl_constructor_conflict_previous_ctor); 6809 Diag(PrevCtor->getLocation(), 6810 diag::note_using_decl_constructor_conflict_previous_using); 6811 } 6812 continue; 6813 } 6814 6815 // OK, we're there, now add the constructor. 6816 // C++0x [class.inhctor]p8: [...] that would be performed by a 6817 // user-written inline constructor [...] 6818 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6819 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6820 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6821 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6822 /*ImplicitlyDeclared=*/true, 6823 // FIXME: Due to a defect in the standard, we treat inherited 6824 // constructors as constexpr even if that makes them ill-formed. 6825 /*Constexpr=*/BaseCtor->isConstexpr()); 6826 NewCtor->setAccess(BaseCtor->getAccess()); 6827 6828 // Build up the parameter decls and add them. 6829 SmallVector<ParmVarDecl *, 16> ParamDecls; 6830 for (unsigned i = 0; i < params; ++i) { 6831 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6832 UsingLoc, UsingLoc, 6833 /*IdentifierInfo=*/0, 6834 BaseCtorType->getArgType(i), 6835 /*TInfo=*/0, SC_None, 6836 SC_None, /*DefaultArg=*/0)); 6837 } 6838 NewCtor->setParams(ParamDecls); 6839 NewCtor->setInheritedConstructor(BaseCtor); 6840 6841 PushOnScopeChains(NewCtor, S, false); 6842 ClassDecl->addDecl(NewCtor); 6843 result.first->second.second = NewCtor; 6844 } 6845 } 6846 } 6847} 6848 6849Sema::ImplicitExceptionSpecification 6850Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6851 // C++ [except.spec]p14: 6852 // An implicitly declared special member function (Clause 12) shall have 6853 // an exception-specification. 6854 ImplicitExceptionSpecification ExceptSpec(Context); 6855 if (ClassDecl->isInvalidDecl()) 6856 return ExceptSpec; 6857 6858 // Direct base-class destructors. 6859 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6860 BEnd = ClassDecl->bases_end(); 6861 B != BEnd; ++B) { 6862 if (B->isVirtual()) // Handled below. 6863 continue; 6864 6865 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6866 ExceptSpec.CalledDecl( 6867 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6868 } 6869 6870 // Virtual base-class destructors. 6871 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6872 BEnd = ClassDecl->vbases_end(); 6873 B != BEnd; ++B) { 6874 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6875 ExceptSpec.CalledDecl( 6876 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6877 } 6878 6879 // Field destructors. 6880 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6881 FEnd = ClassDecl->field_end(); 6882 F != FEnd; ++F) { 6883 if (const RecordType *RecordTy 6884 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6885 ExceptSpec.CalledDecl( 6886 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6887 } 6888 6889 return ExceptSpec; 6890} 6891 6892CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6893 // C++ [class.dtor]p2: 6894 // If a class has no user-declared destructor, a destructor is 6895 // declared implicitly. An implicitly-declared destructor is an 6896 // inline public member of its class. 6897 6898 ImplicitExceptionSpecification Spec = 6899 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6900 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6901 6902 // Create the actual destructor declaration. 6903 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6904 6905 CanQualType ClassType 6906 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6907 SourceLocation ClassLoc = ClassDecl->getLocation(); 6908 DeclarationName Name 6909 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6910 DeclarationNameInfo NameInfo(Name, ClassLoc); 6911 CXXDestructorDecl *Destructor 6912 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6913 /*isInline=*/true, 6914 /*isImplicitlyDeclared=*/true); 6915 Destructor->setAccess(AS_public); 6916 Destructor->setDefaulted(); 6917 Destructor->setImplicit(); 6918 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6919 6920 // Note that we have declared this destructor. 6921 ++ASTContext::NumImplicitDestructorsDeclared; 6922 6923 // Introduce this destructor into its scope. 6924 if (Scope *S = getScopeForContext(ClassDecl)) 6925 PushOnScopeChains(Destructor, S, false); 6926 ClassDecl->addDecl(Destructor); 6927 6928 // This could be uniqued if it ever proves significant. 6929 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6930 6931 if (ShouldDeleteDestructor(Destructor)) 6932 Destructor->setDeletedAsWritten(); 6933 6934 AddOverriddenMethods(ClassDecl, Destructor); 6935 6936 return Destructor; 6937} 6938 6939void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6940 CXXDestructorDecl *Destructor) { 6941 assert((Destructor->isDefaulted() && 6942 !Destructor->doesThisDeclarationHaveABody()) && 6943 "DefineImplicitDestructor - call it for implicit default dtor"); 6944 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6945 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6946 6947 if (Destructor->isInvalidDecl()) 6948 return; 6949 6950 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6951 6952 DiagnosticErrorTrap Trap(Diags); 6953 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6954 Destructor->getParent()); 6955 6956 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6957 Diag(CurrentLocation, diag::note_member_synthesized_at) 6958 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6959 6960 Destructor->setInvalidDecl(); 6961 return; 6962 } 6963 6964 SourceLocation Loc = Destructor->getLocation(); 6965 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6966 6967 Destructor->setUsed(); 6968 MarkVTableUsed(CurrentLocation, ClassDecl); 6969 6970 if (ASTMutationListener *L = getASTMutationListener()) { 6971 L->CompletedImplicitDefinition(Destructor); 6972 } 6973} 6974 6975void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6976 CXXDestructorDecl *destructor) { 6977 // C++11 [class.dtor]p3: 6978 // A declaration of a destructor that does not have an exception- 6979 // specification is implicitly considered to have the same exception- 6980 // specification as an implicit declaration. 6981 const FunctionProtoType *dtorType = destructor->getType()-> 6982 getAs<FunctionProtoType>(); 6983 if (dtorType->hasExceptionSpec()) 6984 return; 6985 6986 ImplicitExceptionSpecification exceptSpec = 6987 ComputeDefaultedDtorExceptionSpec(classDecl); 6988 6989 // Replace the destructor's type, building off the existing one. Fortunately, 6990 // the only thing of interest in the destructor type is its extended info. 6991 // The return and arguments are fixed. 6992 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 6993 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6994 epi.NumExceptions = exceptSpec.size(); 6995 epi.Exceptions = exceptSpec.data(); 6996 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6997 6998 destructor->setType(ty); 6999 7000 // FIXME: If the destructor has a body that could throw, and the newly created 7001 // spec doesn't allow exceptions, we should emit a warning, because this 7002 // change in behavior can break conforming C++03 programs at runtime. 7003 // However, we don't have a body yet, so it needs to be done somewhere else. 7004} 7005 7006/// \brief Builds a statement that copies/moves the given entity from \p From to 7007/// \c To. 7008/// 7009/// This routine is used to copy/move the members of a class with an 7010/// implicitly-declared copy/move assignment operator. When the entities being 7011/// copied are arrays, this routine builds for loops to copy them. 7012/// 7013/// \param S The Sema object used for type-checking. 7014/// 7015/// \param Loc The location where the implicit copy/move is being generated. 7016/// 7017/// \param T The type of the expressions being copied/moved. Both expressions 7018/// must have this type. 7019/// 7020/// \param To The expression we are copying/moving to. 7021/// 7022/// \param From The expression we are copying/moving from. 7023/// 7024/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7025/// Otherwise, it's a non-static member subobject. 7026/// 7027/// \param Copying Whether we're copying or moving. 7028/// 7029/// \param Depth Internal parameter recording the depth of the recursion. 7030/// 7031/// \returns A statement or a loop that copies the expressions. 7032static StmtResult 7033BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7034 Expr *To, Expr *From, 7035 bool CopyingBaseSubobject, bool Copying, 7036 unsigned Depth = 0) { 7037 // C++0x [class.copy]p28: 7038 // Each subobject is assigned in the manner appropriate to its type: 7039 // 7040 // - if the subobject is of class type, as if by a call to operator= with 7041 // the subobject as the object expression and the corresponding 7042 // subobject of x as a single function argument (as if by explicit 7043 // qualification; that is, ignoring any possible virtual overriding 7044 // functions in more derived classes); 7045 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7046 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7047 7048 // Look for operator=. 7049 DeclarationName Name 7050 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7051 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7052 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7053 7054 // Filter out any result that isn't a copy/move-assignment operator. 7055 LookupResult::Filter F = OpLookup.makeFilter(); 7056 while (F.hasNext()) { 7057 NamedDecl *D = F.next(); 7058 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7059 if (Copying ? Method->isCopyAssignmentOperator() : 7060 Method->isMoveAssignmentOperator()) 7061 continue; 7062 7063 F.erase(); 7064 } 7065 F.done(); 7066 7067 // Suppress the protected check (C++ [class.protected]) for each of the 7068 // assignment operators we found. This strange dance is required when 7069 // we're assigning via a base classes's copy-assignment operator. To 7070 // ensure that we're getting the right base class subobject (without 7071 // ambiguities), we need to cast "this" to that subobject type; to 7072 // ensure that we don't go through the virtual call mechanism, we need 7073 // to qualify the operator= name with the base class (see below). However, 7074 // this means that if the base class has a protected copy assignment 7075 // operator, the protected member access check will fail. So, we 7076 // rewrite "protected" access to "public" access in this case, since we 7077 // know by construction that we're calling from a derived class. 7078 if (CopyingBaseSubobject) { 7079 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7080 L != LEnd; ++L) { 7081 if (L.getAccess() == AS_protected) 7082 L.setAccess(AS_public); 7083 } 7084 } 7085 7086 // Create the nested-name-specifier that will be used to qualify the 7087 // reference to operator=; this is required to suppress the virtual 7088 // call mechanism. 7089 CXXScopeSpec SS; 7090 SS.MakeTrivial(S.Context, 7091 NestedNameSpecifier::Create(S.Context, 0, false, 7092 T.getTypePtr()), 7093 Loc); 7094 7095 // Create the reference to operator=. 7096 ExprResult OpEqualRef 7097 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7098 /*FirstQualifierInScope=*/0, OpLookup, 7099 /*TemplateArgs=*/0, 7100 /*SuppressQualifierCheck=*/true); 7101 if (OpEqualRef.isInvalid()) 7102 return StmtError(); 7103 7104 // Build the call to the assignment operator. 7105 7106 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7107 OpEqualRef.takeAs<Expr>(), 7108 Loc, &From, 1, Loc); 7109 if (Call.isInvalid()) 7110 return StmtError(); 7111 7112 return S.Owned(Call.takeAs<Stmt>()); 7113 } 7114 7115 // - if the subobject is of scalar type, the built-in assignment 7116 // operator is used. 7117 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7118 if (!ArrayTy) { 7119 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7120 if (Assignment.isInvalid()) 7121 return StmtError(); 7122 7123 return S.Owned(Assignment.takeAs<Stmt>()); 7124 } 7125 7126 // - if the subobject is an array, each element is assigned, in the 7127 // manner appropriate to the element type; 7128 7129 // Construct a loop over the array bounds, e.g., 7130 // 7131 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7132 // 7133 // that will copy each of the array elements. 7134 QualType SizeType = S.Context.getSizeType(); 7135 7136 // Create the iteration variable. 7137 IdentifierInfo *IterationVarName = 0; 7138 { 7139 llvm::SmallString<8> Str; 7140 llvm::raw_svector_ostream OS(Str); 7141 OS << "__i" << Depth; 7142 IterationVarName = &S.Context.Idents.get(OS.str()); 7143 } 7144 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7145 IterationVarName, SizeType, 7146 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7147 SC_None, SC_None); 7148 7149 // Initialize the iteration variable to zero. 7150 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7151 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7152 7153 // Create a reference to the iteration variable; we'll use this several 7154 // times throughout. 7155 Expr *IterationVarRef 7156 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 7157 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7158 7159 // Create the DeclStmt that holds the iteration variable. 7160 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7161 7162 // Create the comparison against the array bound. 7163 llvm::APInt Upper 7164 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7165 Expr *Comparison 7166 = new (S.Context) BinaryOperator(IterationVarRef, 7167 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7168 BO_NE, S.Context.BoolTy, 7169 VK_RValue, OK_Ordinary, Loc); 7170 7171 // Create the pre-increment of the iteration variable. 7172 Expr *Increment 7173 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7174 VK_LValue, OK_Ordinary, Loc); 7175 7176 // Subscript the "from" and "to" expressions with the iteration variable. 7177 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7178 IterationVarRef, Loc)); 7179 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7180 IterationVarRef, Loc)); 7181 if (!Copying) // Cast to rvalue 7182 From = CastForMoving(S, From); 7183 7184 // Build the copy/move for an individual element of the array. 7185 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7186 To, From, CopyingBaseSubobject, 7187 Copying, Depth + 1); 7188 if (Copy.isInvalid()) 7189 return StmtError(); 7190 7191 // Construct the loop that copies all elements of this array. 7192 return S.ActOnForStmt(Loc, Loc, InitStmt, 7193 S.MakeFullExpr(Comparison), 7194 0, S.MakeFullExpr(Increment), 7195 Loc, Copy.take()); 7196} 7197 7198std::pair<Sema::ImplicitExceptionSpecification, bool> 7199Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7200 CXXRecordDecl *ClassDecl) { 7201 if (ClassDecl->isInvalidDecl()) 7202 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7203 7204 // C++ [class.copy]p10: 7205 // If the class definition does not explicitly declare a copy 7206 // assignment operator, one is declared implicitly. 7207 // The implicitly-defined copy assignment operator for a class X 7208 // will have the form 7209 // 7210 // X& X::operator=(const X&) 7211 // 7212 // if 7213 bool HasConstCopyAssignment = true; 7214 7215 // -- each direct base class B of X has a copy assignment operator 7216 // whose parameter is of type const B&, const volatile B& or B, 7217 // and 7218 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7219 BaseEnd = ClassDecl->bases_end(); 7220 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7221 // We'll handle this below 7222 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7223 continue; 7224 7225 assert(!Base->getType()->isDependentType() && 7226 "Cannot generate implicit members for class with dependent bases."); 7227 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7228 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7229 &HasConstCopyAssignment); 7230 } 7231 7232 // In C++0x, the above citation has "or virtual added" 7233 if (LangOpts.CPlusPlus0x) { 7234 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7235 BaseEnd = ClassDecl->vbases_end(); 7236 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7237 assert(!Base->getType()->isDependentType() && 7238 "Cannot generate implicit members for class with dependent bases."); 7239 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7240 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7241 &HasConstCopyAssignment); 7242 } 7243 } 7244 7245 // -- for all the nonstatic data members of X that are of a class 7246 // type M (or array thereof), each such class type has a copy 7247 // assignment operator whose parameter is of type const M&, 7248 // const volatile M& or M. 7249 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7250 FieldEnd = ClassDecl->field_end(); 7251 HasConstCopyAssignment && Field != FieldEnd; 7252 ++Field) { 7253 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7254 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7255 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7256 &HasConstCopyAssignment); 7257 } 7258 } 7259 7260 // Otherwise, the implicitly declared copy assignment operator will 7261 // have the form 7262 // 7263 // X& X::operator=(X&) 7264 7265 // C++ [except.spec]p14: 7266 // An implicitly declared special member function (Clause 12) shall have an 7267 // exception-specification. [...] 7268 7269 // It is unspecified whether or not an implicit copy assignment operator 7270 // attempts to deduplicate calls to assignment operators of virtual bases are 7271 // made. As such, this exception specification is effectively unspecified. 7272 // Based on a similar decision made for constness in C++0x, we're erring on 7273 // the side of assuming such calls to be made regardless of whether they 7274 // actually happen. 7275 ImplicitExceptionSpecification ExceptSpec(Context); 7276 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7277 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7278 BaseEnd = ClassDecl->bases_end(); 7279 Base != BaseEnd; ++Base) { 7280 if (Base->isVirtual()) 7281 continue; 7282 7283 CXXRecordDecl *BaseClassDecl 7284 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7285 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7286 ArgQuals, false, 0)) 7287 ExceptSpec.CalledDecl(CopyAssign); 7288 } 7289 7290 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7291 BaseEnd = ClassDecl->vbases_end(); 7292 Base != BaseEnd; ++Base) { 7293 CXXRecordDecl *BaseClassDecl 7294 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7295 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7296 ArgQuals, false, 0)) 7297 ExceptSpec.CalledDecl(CopyAssign); 7298 } 7299 7300 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7301 FieldEnd = ClassDecl->field_end(); 7302 Field != FieldEnd; 7303 ++Field) { 7304 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7305 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7306 if (CXXMethodDecl *CopyAssign = 7307 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7308 ExceptSpec.CalledDecl(CopyAssign); 7309 } 7310 } 7311 7312 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7313} 7314 7315CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7316 // Note: The following rules are largely analoguous to the copy 7317 // constructor rules. Note that virtual bases are not taken into account 7318 // for determining the argument type of the operator. Note also that 7319 // operators taking an object instead of a reference are allowed. 7320 7321 ImplicitExceptionSpecification Spec(Context); 7322 bool Const; 7323 llvm::tie(Spec, Const) = 7324 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7325 7326 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7327 QualType RetType = Context.getLValueReferenceType(ArgType); 7328 if (Const) 7329 ArgType = ArgType.withConst(); 7330 ArgType = Context.getLValueReferenceType(ArgType); 7331 7332 // An implicitly-declared copy assignment operator is an inline public 7333 // member of its class. 7334 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7335 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7336 SourceLocation ClassLoc = ClassDecl->getLocation(); 7337 DeclarationNameInfo NameInfo(Name, ClassLoc); 7338 CXXMethodDecl *CopyAssignment 7339 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7340 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7341 /*TInfo=*/0, /*isStatic=*/false, 7342 /*StorageClassAsWritten=*/SC_None, 7343 /*isInline=*/true, /*isConstexpr=*/false, 7344 SourceLocation()); 7345 CopyAssignment->setAccess(AS_public); 7346 CopyAssignment->setDefaulted(); 7347 CopyAssignment->setImplicit(); 7348 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7349 7350 // Add the parameter to the operator. 7351 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7352 ClassLoc, ClassLoc, /*Id=*/0, 7353 ArgType, /*TInfo=*/0, 7354 SC_None, 7355 SC_None, 0); 7356 CopyAssignment->setParams(FromParam); 7357 7358 // Note that we have added this copy-assignment operator. 7359 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7360 7361 if (Scope *S = getScopeForContext(ClassDecl)) 7362 PushOnScopeChains(CopyAssignment, S, false); 7363 ClassDecl->addDecl(CopyAssignment); 7364 7365 // C++0x [class.copy]p18: 7366 // ... If the class definition declares a move constructor or move 7367 // assignment operator, the implicitly declared copy assignment operator is 7368 // defined as deleted; ... 7369 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7370 ClassDecl->hasUserDeclaredMoveAssignment() || 7371 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7372 CopyAssignment->setDeletedAsWritten(); 7373 7374 AddOverriddenMethods(ClassDecl, CopyAssignment); 7375 return CopyAssignment; 7376} 7377 7378void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7379 CXXMethodDecl *CopyAssignOperator) { 7380 assert((CopyAssignOperator->isDefaulted() && 7381 CopyAssignOperator->isOverloadedOperator() && 7382 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7383 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7384 "DefineImplicitCopyAssignment called for wrong function"); 7385 7386 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7387 7388 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7389 CopyAssignOperator->setInvalidDecl(); 7390 return; 7391 } 7392 7393 CopyAssignOperator->setUsed(); 7394 7395 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7396 DiagnosticErrorTrap Trap(Diags); 7397 7398 // C++0x [class.copy]p30: 7399 // The implicitly-defined or explicitly-defaulted copy assignment operator 7400 // for a non-union class X performs memberwise copy assignment of its 7401 // subobjects. The direct base classes of X are assigned first, in the 7402 // order of their declaration in the base-specifier-list, and then the 7403 // immediate non-static data members of X are assigned, in the order in 7404 // which they were declared in the class definition. 7405 7406 // The statements that form the synthesized function body. 7407 ASTOwningVector<Stmt*> Statements(*this); 7408 7409 // The parameter for the "other" object, which we are copying from. 7410 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7411 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7412 QualType OtherRefType = Other->getType(); 7413 if (const LValueReferenceType *OtherRef 7414 = OtherRefType->getAs<LValueReferenceType>()) { 7415 OtherRefType = OtherRef->getPointeeType(); 7416 OtherQuals = OtherRefType.getQualifiers(); 7417 } 7418 7419 // Our location for everything implicitly-generated. 7420 SourceLocation Loc = CopyAssignOperator->getLocation(); 7421 7422 // Construct a reference to the "other" object. We'll be using this 7423 // throughout the generated ASTs. 7424 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7425 assert(OtherRef && "Reference to parameter cannot fail!"); 7426 7427 // Construct the "this" pointer. We'll be using this throughout the generated 7428 // ASTs. 7429 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7430 assert(This && "Reference to this cannot fail!"); 7431 7432 // Assign base classes. 7433 bool Invalid = false; 7434 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7435 E = ClassDecl->bases_end(); Base != E; ++Base) { 7436 // Form the assignment: 7437 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7438 QualType BaseType = Base->getType().getUnqualifiedType(); 7439 if (!BaseType->isRecordType()) { 7440 Invalid = true; 7441 continue; 7442 } 7443 7444 CXXCastPath BasePath; 7445 BasePath.push_back(Base); 7446 7447 // Construct the "from" expression, which is an implicit cast to the 7448 // appropriately-qualified base type. 7449 Expr *From = OtherRef; 7450 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7451 CK_UncheckedDerivedToBase, 7452 VK_LValue, &BasePath).take(); 7453 7454 // Dereference "this". 7455 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7456 7457 // Implicitly cast "this" to the appropriately-qualified base type. 7458 To = ImpCastExprToType(To.take(), 7459 Context.getCVRQualifiedType(BaseType, 7460 CopyAssignOperator->getTypeQualifiers()), 7461 CK_UncheckedDerivedToBase, 7462 VK_LValue, &BasePath); 7463 7464 // Build the copy. 7465 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7466 To.get(), From, 7467 /*CopyingBaseSubobject=*/true, 7468 /*Copying=*/true); 7469 if (Copy.isInvalid()) { 7470 Diag(CurrentLocation, diag::note_member_synthesized_at) 7471 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7472 CopyAssignOperator->setInvalidDecl(); 7473 return; 7474 } 7475 7476 // Success! Record the copy. 7477 Statements.push_back(Copy.takeAs<Expr>()); 7478 } 7479 7480 // \brief Reference to the __builtin_memcpy function. 7481 Expr *BuiltinMemCpyRef = 0; 7482 // \brief Reference to the __builtin_objc_memmove_collectable function. 7483 Expr *CollectableMemCpyRef = 0; 7484 7485 // Assign non-static members. 7486 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7487 FieldEnd = ClassDecl->field_end(); 7488 Field != FieldEnd; ++Field) { 7489 // Check for members of reference type; we can't copy those. 7490 if (Field->getType()->isReferenceType()) { 7491 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7492 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7493 Diag(Field->getLocation(), diag::note_declared_at); 7494 Diag(CurrentLocation, diag::note_member_synthesized_at) 7495 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7496 Invalid = true; 7497 continue; 7498 } 7499 7500 // Check for members of const-qualified, non-class type. 7501 QualType BaseType = Context.getBaseElementType(Field->getType()); 7502 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7503 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7504 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7505 Diag(Field->getLocation(), diag::note_declared_at); 7506 Diag(CurrentLocation, diag::note_member_synthesized_at) 7507 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7508 Invalid = true; 7509 continue; 7510 } 7511 7512 // Suppress assigning zero-width bitfields. 7513 if (const Expr *Width = Field->getBitWidth()) 7514 if (Width->EvaluateAsInt(Context) == 0) 7515 continue; 7516 7517 QualType FieldType = Field->getType().getNonReferenceType(); 7518 if (FieldType->isIncompleteArrayType()) { 7519 assert(ClassDecl->hasFlexibleArrayMember() && 7520 "Incomplete array type is not valid"); 7521 continue; 7522 } 7523 7524 // Build references to the field in the object we're copying from and to. 7525 CXXScopeSpec SS; // Intentionally empty 7526 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7527 LookupMemberName); 7528 MemberLookup.addDecl(*Field); 7529 MemberLookup.resolveKind(); 7530 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7531 Loc, /*IsArrow=*/false, 7532 SS, 0, MemberLookup, 0); 7533 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7534 Loc, /*IsArrow=*/true, 7535 SS, 0, MemberLookup, 0); 7536 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7537 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7538 7539 // If the field should be copied with __builtin_memcpy rather than via 7540 // explicit assignments, do so. This optimization only applies for arrays 7541 // of scalars and arrays of class type with trivial copy-assignment 7542 // operators. 7543 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7544 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7545 // Compute the size of the memory buffer to be copied. 7546 QualType SizeType = Context.getSizeType(); 7547 llvm::APInt Size(Context.getTypeSize(SizeType), 7548 Context.getTypeSizeInChars(BaseType).getQuantity()); 7549 for (const ConstantArrayType *Array 7550 = Context.getAsConstantArrayType(FieldType); 7551 Array; 7552 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7553 llvm::APInt ArraySize 7554 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7555 Size *= ArraySize; 7556 } 7557 7558 // Take the address of the field references for "from" and "to". 7559 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7560 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7561 7562 bool NeedsCollectableMemCpy = 7563 (BaseType->isRecordType() && 7564 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7565 7566 if (NeedsCollectableMemCpy) { 7567 if (!CollectableMemCpyRef) { 7568 // Create a reference to the __builtin_objc_memmove_collectable function. 7569 LookupResult R(*this, 7570 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7571 Loc, LookupOrdinaryName); 7572 LookupName(R, TUScope, true); 7573 7574 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7575 if (!CollectableMemCpy) { 7576 // Something went horribly wrong earlier, and we will have 7577 // complained about it. 7578 Invalid = true; 7579 continue; 7580 } 7581 7582 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7583 CollectableMemCpy->getType(), 7584 VK_LValue, Loc, 0).take(); 7585 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7586 } 7587 } 7588 // Create a reference to the __builtin_memcpy builtin function. 7589 else if (!BuiltinMemCpyRef) { 7590 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7591 LookupOrdinaryName); 7592 LookupName(R, TUScope, true); 7593 7594 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7595 if (!BuiltinMemCpy) { 7596 // Something went horribly wrong earlier, and we will have complained 7597 // about it. 7598 Invalid = true; 7599 continue; 7600 } 7601 7602 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7603 BuiltinMemCpy->getType(), 7604 VK_LValue, Loc, 0).take(); 7605 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7606 } 7607 7608 ASTOwningVector<Expr*> CallArgs(*this); 7609 CallArgs.push_back(To.takeAs<Expr>()); 7610 CallArgs.push_back(From.takeAs<Expr>()); 7611 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7612 ExprResult Call = ExprError(); 7613 if (NeedsCollectableMemCpy) 7614 Call = ActOnCallExpr(/*Scope=*/0, 7615 CollectableMemCpyRef, 7616 Loc, move_arg(CallArgs), 7617 Loc); 7618 else 7619 Call = ActOnCallExpr(/*Scope=*/0, 7620 BuiltinMemCpyRef, 7621 Loc, move_arg(CallArgs), 7622 Loc); 7623 7624 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7625 Statements.push_back(Call.takeAs<Expr>()); 7626 continue; 7627 } 7628 7629 // Build the copy of this field. 7630 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7631 To.get(), From.get(), 7632 /*CopyingBaseSubobject=*/false, 7633 /*Copying=*/true); 7634 if (Copy.isInvalid()) { 7635 Diag(CurrentLocation, diag::note_member_synthesized_at) 7636 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7637 CopyAssignOperator->setInvalidDecl(); 7638 return; 7639 } 7640 7641 // Success! Record the copy. 7642 Statements.push_back(Copy.takeAs<Stmt>()); 7643 } 7644 7645 if (!Invalid) { 7646 // Add a "return *this;" 7647 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7648 7649 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7650 if (Return.isInvalid()) 7651 Invalid = true; 7652 else { 7653 Statements.push_back(Return.takeAs<Stmt>()); 7654 7655 if (Trap.hasErrorOccurred()) { 7656 Diag(CurrentLocation, diag::note_member_synthesized_at) 7657 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7658 Invalid = true; 7659 } 7660 } 7661 } 7662 7663 if (Invalid) { 7664 CopyAssignOperator->setInvalidDecl(); 7665 return; 7666 } 7667 7668 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7669 /*isStmtExpr=*/false); 7670 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7671 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7672 7673 if (ASTMutationListener *L = getASTMutationListener()) { 7674 L->CompletedImplicitDefinition(CopyAssignOperator); 7675 } 7676} 7677 7678Sema::ImplicitExceptionSpecification 7679Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7680 ImplicitExceptionSpecification ExceptSpec(Context); 7681 7682 if (ClassDecl->isInvalidDecl()) 7683 return ExceptSpec; 7684 7685 // C++0x [except.spec]p14: 7686 // An implicitly declared special member function (Clause 12) shall have an 7687 // exception-specification. [...] 7688 7689 // It is unspecified whether or not an implicit move assignment operator 7690 // attempts to deduplicate calls to assignment operators of virtual bases are 7691 // made. As such, this exception specification is effectively unspecified. 7692 // Based on a similar decision made for constness in C++0x, we're erring on 7693 // the side of assuming such calls to be made regardless of whether they 7694 // actually happen. 7695 // Note that a move constructor is not implicitly declared when there are 7696 // virtual bases, but it can still be user-declared and explicitly defaulted. 7697 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7698 BaseEnd = ClassDecl->bases_end(); 7699 Base != BaseEnd; ++Base) { 7700 if (Base->isVirtual()) 7701 continue; 7702 7703 CXXRecordDecl *BaseClassDecl 7704 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7705 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7706 false, 0)) 7707 ExceptSpec.CalledDecl(MoveAssign); 7708 } 7709 7710 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7711 BaseEnd = ClassDecl->vbases_end(); 7712 Base != BaseEnd; ++Base) { 7713 CXXRecordDecl *BaseClassDecl 7714 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7715 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7716 false, 0)) 7717 ExceptSpec.CalledDecl(MoveAssign); 7718 } 7719 7720 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7721 FieldEnd = ClassDecl->field_end(); 7722 Field != FieldEnd; 7723 ++Field) { 7724 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7725 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7726 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7727 false, 0)) 7728 ExceptSpec.CalledDecl(MoveAssign); 7729 } 7730 } 7731 7732 return ExceptSpec; 7733} 7734 7735CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 7736 // Note: The following rules are largely analoguous to the move 7737 // constructor rules. 7738 7739 ImplicitExceptionSpecification Spec( 7740 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 7741 7742 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7743 QualType RetType = Context.getLValueReferenceType(ArgType); 7744 ArgType = Context.getRValueReferenceType(ArgType); 7745 7746 // An implicitly-declared move assignment operator is an inline public 7747 // member of its class. 7748 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7749 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7750 SourceLocation ClassLoc = ClassDecl->getLocation(); 7751 DeclarationNameInfo NameInfo(Name, ClassLoc); 7752 CXXMethodDecl *MoveAssignment 7753 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7754 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7755 /*TInfo=*/0, /*isStatic=*/false, 7756 /*StorageClassAsWritten=*/SC_None, 7757 /*isInline=*/true, 7758 /*isConstexpr=*/false, 7759 SourceLocation()); 7760 MoveAssignment->setAccess(AS_public); 7761 MoveAssignment->setDefaulted(); 7762 MoveAssignment->setImplicit(); 7763 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 7764 7765 // Add the parameter to the operator. 7766 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 7767 ClassLoc, ClassLoc, /*Id=*/0, 7768 ArgType, /*TInfo=*/0, 7769 SC_None, 7770 SC_None, 0); 7771 MoveAssignment->setParams(FromParam); 7772 7773 // Note that we have added this copy-assignment operator. 7774 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 7775 7776 // C++0x [class.copy]p9: 7777 // If the definition of a class X does not explicitly declare a move 7778 // assignment operator, one will be implicitly declared as defaulted if and 7779 // only if: 7780 // [...] 7781 // - the move assignment operator would not be implicitly defined as 7782 // deleted. 7783 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 7784 // Cache this result so that we don't try to generate this over and over 7785 // on every lookup, leaking memory and wasting time. 7786 ClassDecl->setFailedImplicitMoveAssignment(); 7787 return 0; 7788 } 7789 7790 if (Scope *S = getScopeForContext(ClassDecl)) 7791 PushOnScopeChains(MoveAssignment, S, false); 7792 ClassDecl->addDecl(MoveAssignment); 7793 7794 AddOverriddenMethods(ClassDecl, MoveAssignment); 7795 return MoveAssignment; 7796} 7797 7798void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 7799 CXXMethodDecl *MoveAssignOperator) { 7800 assert((MoveAssignOperator->isDefaulted() && 7801 MoveAssignOperator->isOverloadedOperator() && 7802 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 7803 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 7804 "DefineImplicitMoveAssignment called for wrong function"); 7805 7806 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 7807 7808 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 7809 MoveAssignOperator->setInvalidDecl(); 7810 return; 7811 } 7812 7813 MoveAssignOperator->setUsed(); 7814 7815 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 7816 DiagnosticErrorTrap Trap(Diags); 7817 7818 // C++0x [class.copy]p28: 7819 // The implicitly-defined or move assignment operator for a non-union class 7820 // X performs memberwise move assignment of its subobjects. The direct base 7821 // classes of X are assigned first, in the order of their declaration in the 7822 // base-specifier-list, and then the immediate non-static data members of X 7823 // are assigned, in the order in which they were declared in the class 7824 // definition. 7825 7826 // The statements that form the synthesized function body. 7827 ASTOwningVector<Stmt*> Statements(*this); 7828 7829 // The parameter for the "other" object, which we are move from. 7830 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 7831 QualType OtherRefType = Other->getType()-> 7832 getAs<RValueReferenceType>()->getPointeeType(); 7833 assert(OtherRefType.getQualifiers() == 0 && 7834 "Bad argument type of defaulted move assignment"); 7835 7836 // Our location for everything implicitly-generated. 7837 SourceLocation Loc = MoveAssignOperator->getLocation(); 7838 7839 // Construct a reference to the "other" object. We'll be using this 7840 // throughout the generated ASTs. 7841 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7842 assert(OtherRef && "Reference to parameter cannot fail!"); 7843 // Cast to rvalue. 7844 OtherRef = CastForMoving(*this, OtherRef); 7845 7846 // Construct the "this" pointer. We'll be using this throughout the generated 7847 // ASTs. 7848 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7849 assert(This && "Reference to this cannot fail!"); 7850 7851 // Assign base classes. 7852 bool Invalid = false; 7853 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7854 E = ClassDecl->bases_end(); Base != E; ++Base) { 7855 // Form the assignment: 7856 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 7857 QualType BaseType = Base->getType().getUnqualifiedType(); 7858 if (!BaseType->isRecordType()) { 7859 Invalid = true; 7860 continue; 7861 } 7862 7863 CXXCastPath BasePath; 7864 BasePath.push_back(Base); 7865 7866 // Construct the "from" expression, which is an implicit cast to the 7867 // appropriately-qualified base type. 7868 Expr *From = OtherRef; 7869 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 7870 VK_XValue, &BasePath).take(); 7871 7872 // Dereference "this". 7873 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7874 7875 // Implicitly cast "this" to the appropriately-qualified base type. 7876 To = ImpCastExprToType(To.take(), 7877 Context.getCVRQualifiedType(BaseType, 7878 MoveAssignOperator->getTypeQualifiers()), 7879 CK_UncheckedDerivedToBase, 7880 VK_LValue, &BasePath); 7881 7882 // Build the move. 7883 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 7884 To.get(), From, 7885 /*CopyingBaseSubobject=*/true, 7886 /*Copying=*/false); 7887 if (Move.isInvalid()) { 7888 Diag(CurrentLocation, diag::note_member_synthesized_at) 7889 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7890 MoveAssignOperator->setInvalidDecl(); 7891 return; 7892 } 7893 7894 // Success! Record the move. 7895 Statements.push_back(Move.takeAs<Expr>()); 7896 } 7897 7898 // \brief Reference to the __builtin_memcpy function. 7899 Expr *BuiltinMemCpyRef = 0; 7900 // \brief Reference to the __builtin_objc_memmove_collectable function. 7901 Expr *CollectableMemCpyRef = 0; 7902 7903 // Assign non-static members. 7904 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7905 FieldEnd = ClassDecl->field_end(); 7906 Field != FieldEnd; ++Field) { 7907 // Check for members of reference type; we can't move those. 7908 if (Field->getType()->isReferenceType()) { 7909 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7910 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7911 Diag(Field->getLocation(), diag::note_declared_at); 7912 Diag(CurrentLocation, diag::note_member_synthesized_at) 7913 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7914 Invalid = true; 7915 continue; 7916 } 7917 7918 // Check for members of const-qualified, non-class type. 7919 QualType BaseType = Context.getBaseElementType(Field->getType()); 7920 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7921 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7922 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7923 Diag(Field->getLocation(), diag::note_declared_at); 7924 Diag(CurrentLocation, diag::note_member_synthesized_at) 7925 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 7926 Invalid = true; 7927 continue; 7928 } 7929 7930 // Suppress assigning zero-width bitfields. 7931 if (const Expr *Width = Field->getBitWidth()) 7932 if (Width->EvaluateAsInt(Context) == 0) 7933 continue; 7934 7935 QualType FieldType = Field->getType().getNonReferenceType(); 7936 if (FieldType->isIncompleteArrayType()) { 7937 assert(ClassDecl->hasFlexibleArrayMember() && 7938 "Incomplete array type is not valid"); 7939 continue; 7940 } 7941 7942 // Build references to the field in the object we're copying from and to. 7943 CXXScopeSpec SS; // Intentionally empty 7944 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7945 LookupMemberName); 7946 MemberLookup.addDecl(*Field); 7947 MemberLookup.resolveKind(); 7948 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7949 Loc, /*IsArrow=*/false, 7950 SS, 0, MemberLookup, 0); 7951 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7952 Loc, /*IsArrow=*/true, 7953 SS, 0, MemberLookup, 0); 7954 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7955 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7956 7957 assert(!From.get()->isLValue() && // could be xvalue or prvalue 7958 "Member reference with rvalue base must be rvalue except for reference " 7959 "members, which aren't allowed for move assignment."); 7960 7961 // If the field should be copied with __builtin_memcpy rather than via 7962 // explicit assignments, do so. This optimization only applies for arrays 7963 // of scalars and arrays of class type with trivial move-assignment 7964 // operators. 7965 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7966 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 7967 // Compute the size of the memory buffer to be copied. 7968 QualType SizeType = Context.getSizeType(); 7969 llvm::APInt Size(Context.getTypeSize(SizeType), 7970 Context.getTypeSizeInChars(BaseType).getQuantity()); 7971 for (const ConstantArrayType *Array 7972 = Context.getAsConstantArrayType(FieldType); 7973 Array; 7974 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7975 llvm::APInt ArraySize 7976 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7977 Size *= ArraySize; 7978 } 7979 7980 // Take the address of the field references for "from" and "to". We 7981 // directly construct UnaryOperators here because semantic analysis 7982 // does not permit us to take the address of an xvalue. 7983 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 7984 Context.getPointerType(From.get()->getType()), 7985 VK_RValue, OK_Ordinary, Loc); 7986 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 7987 Context.getPointerType(To.get()->getType()), 7988 VK_RValue, OK_Ordinary, Loc); 7989 7990 bool NeedsCollectableMemCpy = 7991 (BaseType->isRecordType() && 7992 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7993 7994 if (NeedsCollectableMemCpy) { 7995 if (!CollectableMemCpyRef) { 7996 // Create a reference to the __builtin_objc_memmove_collectable function. 7997 LookupResult R(*this, 7998 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7999 Loc, LookupOrdinaryName); 8000 LookupName(R, TUScope, true); 8001 8002 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8003 if (!CollectableMemCpy) { 8004 // Something went horribly wrong earlier, and we will have 8005 // complained about it. 8006 Invalid = true; 8007 continue; 8008 } 8009 8010 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8011 CollectableMemCpy->getType(), 8012 VK_LValue, Loc, 0).take(); 8013 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8014 } 8015 } 8016 // Create a reference to the __builtin_memcpy builtin function. 8017 else if (!BuiltinMemCpyRef) { 8018 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8019 LookupOrdinaryName); 8020 LookupName(R, TUScope, true); 8021 8022 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8023 if (!BuiltinMemCpy) { 8024 // Something went horribly wrong earlier, and we will have complained 8025 // about it. 8026 Invalid = true; 8027 continue; 8028 } 8029 8030 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8031 BuiltinMemCpy->getType(), 8032 VK_LValue, Loc, 0).take(); 8033 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8034 } 8035 8036 ASTOwningVector<Expr*> CallArgs(*this); 8037 CallArgs.push_back(To.takeAs<Expr>()); 8038 CallArgs.push_back(From.takeAs<Expr>()); 8039 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8040 ExprResult Call = ExprError(); 8041 if (NeedsCollectableMemCpy) 8042 Call = ActOnCallExpr(/*Scope=*/0, 8043 CollectableMemCpyRef, 8044 Loc, move_arg(CallArgs), 8045 Loc); 8046 else 8047 Call = ActOnCallExpr(/*Scope=*/0, 8048 BuiltinMemCpyRef, 8049 Loc, move_arg(CallArgs), 8050 Loc); 8051 8052 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8053 Statements.push_back(Call.takeAs<Expr>()); 8054 continue; 8055 } 8056 8057 // Build the move of this field. 8058 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8059 To.get(), From.get(), 8060 /*CopyingBaseSubobject=*/false, 8061 /*Copying=*/false); 8062 if (Move.isInvalid()) { 8063 Diag(CurrentLocation, diag::note_member_synthesized_at) 8064 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8065 MoveAssignOperator->setInvalidDecl(); 8066 return; 8067 } 8068 8069 // Success! Record the copy. 8070 Statements.push_back(Move.takeAs<Stmt>()); 8071 } 8072 8073 if (!Invalid) { 8074 // Add a "return *this;" 8075 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8076 8077 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8078 if (Return.isInvalid()) 8079 Invalid = true; 8080 else { 8081 Statements.push_back(Return.takeAs<Stmt>()); 8082 8083 if (Trap.hasErrorOccurred()) { 8084 Diag(CurrentLocation, diag::note_member_synthesized_at) 8085 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8086 Invalid = true; 8087 } 8088 } 8089 } 8090 8091 if (Invalid) { 8092 MoveAssignOperator->setInvalidDecl(); 8093 return; 8094 } 8095 8096 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8097 /*isStmtExpr=*/false); 8098 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8099 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8100 8101 if (ASTMutationListener *L = getASTMutationListener()) { 8102 L->CompletedImplicitDefinition(MoveAssignOperator); 8103 } 8104} 8105 8106std::pair<Sema::ImplicitExceptionSpecification, bool> 8107Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8108 if (ClassDecl->isInvalidDecl()) 8109 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8110 8111 // C++ [class.copy]p5: 8112 // The implicitly-declared copy constructor for a class X will 8113 // have the form 8114 // 8115 // X::X(const X&) 8116 // 8117 // if 8118 // FIXME: It ought to be possible to store this on the record. 8119 bool HasConstCopyConstructor = true; 8120 8121 // -- each direct or virtual base class B of X has a copy 8122 // constructor whose first parameter is of type const B& or 8123 // const volatile B&, and 8124 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8125 BaseEnd = ClassDecl->bases_end(); 8126 HasConstCopyConstructor && Base != BaseEnd; 8127 ++Base) { 8128 // Virtual bases are handled below. 8129 if (Base->isVirtual()) 8130 continue; 8131 8132 CXXRecordDecl *BaseClassDecl 8133 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8134 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8135 &HasConstCopyConstructor); 8136 } 8137 8138 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8139 BaseEnd = ClassDecl->vbases_end(); 8140 HasConstCopyConstructor && Base != BaseEnd; 8141 ++Base) { 8142 CXXRecordDecl *BaseClassDecl 8143 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8144 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8145 &HasConstCopyConstructor); 8146 } 8147 8148 // -- for all the nonstatic data members of X that are of a 8149 // class type M (or array thereof), each such class type 8150 // has a copy constructor whose first parameter is of type 8151 // const M& or const volatile M&. 8152 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8153 FieldEnd = ClassDecl->field_end(); 8154 HasConstCopyConstructor && Field != FieldEnd; 8155 ++Field) { 8156 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8157 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8158 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8159 &HasConstCopyConstructor); 8160 } 8161 } 8162 // Otherwise, the implicitly declared copy constructor will have 8163 // the form 8164 // 8165 // X::X(X&) 8166 8167 // C++ [except.spec]p14: 8168 // An implicitly declared special member function (Clause 12) shall have an 8169 // exception-specification. [...] 8170 ImplicitExceptionSpecification ExceptSpec(Context); 8171 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8172 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8173 BaseEnd = ClassDecl->bases_end(); 8174 Base != BaseEnd; 8175 ++Base) { 8176 // Virtual bases are handled below. 8177 if (Base->isVirtual()) 8178 continue; 8179 8180 CXXRecordDecl *BaseClassDecl 8181 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8182 if (CXXConstructorDecl *CopyConstructor = 8183 LookupCopyingConstructor(BaseClassDecl, Quals)) 8184 ExceptSpec.CalledDecl(CopyConstructor); 8185 } 8186 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8187 BaseEnd = ClassDecl->vbases_end(); 8188 Base != BaseEnd; 8189 ++Base) { 8190 CXXRecordDecl *BaseClassDecl 8191 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8192 if (CXXConstructorDecl *CopyConstructor = 8193 LookupCopyingConstructor(BaseClassDecl, Quals)) 8194 ExceptSpec.CalledDecl(CopyConstructor); 8195 } 8196 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8197 FieldEnd = ClassDecl->field_end(); 8198 Field != FieldEnd; 8199 ++Field) { 8200 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8201 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8202 if (CXXConstructorDecl *CopyConstructor = 8203 LookupCopyingConstructor(FieldClassDecl, Quals)) 8204 ExceptSpec.CalledDecl(CopyConstructor); 8205 } 8206 } 8207 8208 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8209} 8210 8211CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8212 CXXRecordDecl *ClassDecl) { 8213 // C++ [class.copy]p4: 8214 // If the class definition does not explicitly declare a copy 8215 // constructor, one is declared implicitly. 8216 8217 ImplicitExceptionSpecification Spec(Context); 8218 bool Const; 8219 llvm::tie(Spec, Const) = 8220 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8221 8222 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8223 QualType ArgType = ClassType; 8224 if (Const) 8225 ArgType = ArgType.withConst(); 8226 ArgType = Context.getLValueReferenceType(ArgType); 8227 8228 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8229 8230 DeclarationName Name 8231 = Context.DeclarationNames.getCXXConstructorName( 8232 Context.getCanonicalType(ClassType)); 8233 SourceLocation ClassLoc = ClassDecl->getLocation(); 8234 DeclarationNameInfo NameInfo(Name, ClassLoc); 8235 8236 // An implicitly-declared copy constructor is an inline public 8237 // member of its class. 8238 CXXConstructorDecl *CopyConstructor 8239 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8240 Context.getFunctionType(Context.VoidTy, 8241 &ArgType, 1, EPI), 8242 /*TInfo=*/0, 8243 /*isExplicit=*/false, 8244 /*isInline=*/true, 8245 /*isImplicitlyDeclared=*/true, 8246 // FIXME: apply the rules for definitions here 8247 /*isConstexpr=*/false); 8248 CopyConstructor->setAccess(AS_public); 8249 CopyConstructor->setDefaulted(); 8250 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8251 8252 // Note that we have declared this constructor. 8253 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8254 8255 // Add the parameter to the constructor. 8256 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8257 ClassLoc, ClassLoc, 8258 /*IdentifierInfo=*/0, 8259 ArgType, /*TInfo=*/0, 8260 SC_None, 8261 SC_None, 0); 8262 CopyConstructor->setParams(FromParam); 8263 8264 if (Scope *S = getScopeForContext(ClassDecl)) 8265 PushOnScopeChains(CopyConstructor, S, false); 8266 ClassDecl->addDecl(CopyConstructor); 8267 8268 // C++0x [class.copy]p7: 8269 // ... If the class definition declares a move constructor or move 8270 // assignment operator, the implicitly declared constructor is defined as 8271 // deleted; ... 8272 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8273 ClassDecl->hasUserDeclaredMoveAssignment() || 8274 ShouldDeleteCopyConstructor(CopyConstructor)) 8275 CopyConstructor->setDeletedAsWritten(); 8276 8277 return CopyConstructor; 8278} 8279 8280void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8281 CXXConstructorDecl *CopyConstructor) { 8282 assert((CopyConstructor->isDefaulted() && 8283 CopyConstructor->isCopyConstructor() && 8284 !CopyConstructor->doesThisDeclarationHaveABody()) && 8285 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8286 8287 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8288 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8289 8290 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8291 DiagnosticErrorTrap Trap(Diags); 8292 8293 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8294 Trap.hasErrorOccurred()) { 8295 Diag(CurrentLocation, diag::note_member_synthesized_at) 8296 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8297 CopyConstructor->setInvalidDecl(); 8298 } else { 8299 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8300 CopyConstructor->getLocation(), 8301 MultiStmtArg(*this, 0, 0), 8302 /*isStmtExpr=*/false) 8303 .takeAs<Stmt>()); 8304 } 8305 8306 CopyConstructor->setUsed(); 8307 8308 if (ASTMutationListener *L = getASTMutationListener()) { 8309 L->CompletedImplicitDefinition(CopyConstructor); 8310 } 8311} 8312 8313Sema::ImplicitExceptionSpecification 8314Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8315 // C++ [except.spec]p14: 8316 // An implicitly declared special member function (Clause 12) shall have an 8317 // exception-specification. [...] 8318 ImplicitExceptionSpecification ExceptSpec(Context); 8319 if (ClassDecl->isInvalidDecl()) 8320 return ExceptSpec; 8321 8322 // Direct base-class constructors. 8323 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8324 BEnd = ClassDecl->bases_end(); 8325 B != BEnd; ++B) { 8326 if (B->isVirtual()) // Handled below. 8327 continue; 8328 8329 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8330 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8331 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8332 // If this is a deleted function, add it anyway. This might be conformant 8333 // with the standard. This might not. I'm not sure. It might not matter. 8334 if (Constructor) 8335 ExceptSpec.CalledDecl(Constructor); 8336 } 8337 } 8338 8339 // Virtual base-class constructors. 8340 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8341 BEnd = ClassDecl->vbases_end(); 8342 B != BEnd; ++B) { 8343 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8344 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8345 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8346 // If this is a deleted function, add it anyway. This might be conformant 8347 // with the standard. This might not. I'm not sure. It might not matter. 8348 if (Constructor) 8349 ExceptSpec.CalledDecl(Constructor); 8350 } 8351 } 8352 8353 // Field constructors. 8354 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8355 FEnd = ClassDecl->field_end(); 8356 F != FEnd; ++F) { 8357 if (F->hasInClassInitializer()) { 8358 if (Expr *E = F->getInClassInitializer()) 8359 ExceptSpec.CalledExpr(E); 8360 else if (!F->isInvalidDecl()) 8361 ExceptSpec.SetDelayed(); 8362 } else if (const RecordType *RecordTy 8363 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8364 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8365 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8366 // If this is a deleted function, add it anyway. This might be conformant 8367 // with the standard. This might not. I'm not sure. It might not matter. 8368 // In particular, the problem is that this function never gets called. It 8369 // might just be ill-formed because this function attempts to refer to 8370 // a deleted function here. 8371 if (Constructor) 8372 ExceptSpec.CalledDecl(Constructor); 8373 } 8374 } 8375 8376 return ExceptSpec; 8377} 8378 8379CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8380 CXXRecordDecl *ClassDecl) { 8381 ImplicitExceptionSpecification Spec( 8382 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8383 8384 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8385 QualType ArgType = Context.getRValueReferenceType(ClassType); 8386 8387 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8388 8389 DeclarationName Name 8390 = Context.DeclarationNames.getCXXConstructorName( 8391 Context.getCanonicalType(ClassType)); 8392 SourceLocation ClassLoc = ClassDecl->getLocation(); 8393 DeclarationNameInfo NameInfo(Name, ClassLoc); 8394 8395 // C++0x [class.copy]p11: 8396 // An implicitly-declared copy/move constructor is an inline public 8397 // member of its class. 8398 CXXConstructorDecl *MoveConstructor 8399 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8400 Context.getFunctionType(Context.VoidTy, 8401 &ArgType, 1, EPI), 8402 /*TInfo=*/0, 8403 /*isExplicit=*/false, 8404 /*isInline=*/true, 8405 /*isImplicitlyDeclared=*/true, 8406 // FIXME: apply the rules for definitions here 8407 /*isConstexpr=*/false); 8408 MoveConstructor->setAccess(AS_public); 8409 MoveConstructor->setDefaulted(); 8410 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8411 8412 // Add the parameter to the constructor. 8413 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8414 ClassLoc, ClassLoc, 8415 /*IdentifierInfo=*/0, 8416 ArgType, /*TInfo=*/0, 8417 SC_None, 8418 SC_None, 0); 8419 MoveConstructor->setParams(FromParam); 8420 8421 // C++0x [class.copy]p9: 8422 // If the definition of a class X does not explicitly declare a move 8423 // constructor, one will be implicitly declared as defaulted if and only if: 8424 // [...] 8425 // - the move constructor would not be implicitly defined as deleted. 8426 if (ShouldDeleteMoveConstructor(MoveConstructor)) { 8427 // Cache this result so that we don't try to generate this over and over 8428 // on every lookup, leaking memory and wasting time. 8429 ClassDecl->setFailedImplicitMoveConstructor(); 8430 return 0; 8431 } 8432 8433 // Note that we have declared this constructor. 8434 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8435 8436 if (Scope *S = getScopeForContext(ClassDecl)) 8437 PushOnScopeChains(MoveConstructor, S, false); 8438 ClassDecl->addDecl(MoveConstructor); 8439 8440 return MoveConstructor; 8441} 8442 8443void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8444 CXXConstructorDecl *MoveConstructor) { 8445 assert((MoveConstructor->isDefaulted() && 8446 MoveConstructor->isMoveConstructor() && 8447 !MoveConstructor->doesThisDeclarationHaveABody()) && 8448 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8449 8450 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8451 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8452 8453 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8454 DiagnosticErrorTrap Trap(Diags); 8455 8456 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8457 Trap.hasErrorOccurred()) { 8458 Diag(CurrentLocation, diag::note_member_synthesized_at) 8459 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8460 MoveConstructor->setInvalidDecl(); 8461 } else { 8462 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8463 MoveConstructor->getLocation(), 8464 MultiStmtArg(*this, 0, 0), 8465 /*isStmtExpr=*/false) 8466 .takeAs<Stmt>()); 8467 } 8468 8469 MoveConstructor->setUsed(); 8470 8471 if (ASTMutationListener *L = getASTMutationListener()) { 8472 L->CompletedImplicitDefinition(MoveConstructor); 8473 } 8474} 8475 8476ExprResult 8477Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8478 CXXConstructorDecl *Constructor, 8479 MultiExprArg ExprArgs, 8480 bool RequiresZeroInit, 8481 unsigned ConstructKind, 8482 SourceRange ParenRange) { 8483 bool Elidable = false; 8484 8485 // C++0x [class.copy]p34: 8486 // When certain criteria are met, an implementation is allowed to 8487 // omit the copy/move construction of a class object, even if the 8488 // copy/move constructor and/or destructor for the object have 8489 // side effects. [...] 8490 // - when a temporary class object that has not been bound to a 8491 // reference (12.2) would be copied/moved to a class object 8492 // with the same cv-unqualified type, the copy/move operation 8493 // can be omitted by constructing the temporary object 8494 // directly into the target of the omitted copy/move 8495 if (ConstructKind == CXXConstructExpr::CK_Complete && 8496 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8497 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8498 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8499 } 8500 8501 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8502 Elidable, move(ExprArgs), RequiresZeroInit, 8503 ConstructKind, ParenRange); 8504} 8505 8506/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8507/// including handling of its default argument expressions. 8508ExprResult 8509Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8510 CXXConstructorDecl *Constructor, bool Elidable, 8511 MultiExprArg ExprArgs, 8512 bool RequiresZeroInit, 8513 unsigned ConstructKind, 8514 SourceRange ParenRange) { 8515 unsigned NumExprs = ExprArgs.size(); 8516 Expr **Exprs = (Expr **)ExprArgs.release(); 8517 8518 for (specific_attr_iterator<NonNullAttr> 8519 i = Constructor->specific_attr_begin<NonNullAttr>(), 8520 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8521 const NonNullAttr *NonNull = *i; 8522 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8523 } 8524 8525 MarkDeclarationReferenced(ConstructLoc, Constructor); 8526 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8527 Constructor, Elidable, Exprs, NumExprs, 8528 RequiresZeroInit, 8529 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8530 ParenRange)); 8531} 8532 8533bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8534 CXXConstructorDecl *Constructor, 8535 MultiExprArg Exprs) { 8536 // FIXME: Provide the correct paren SourceRange when available. 8537 ExprResult TempResult = 8538 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8539 move(Exprs), false, CXXConstructExpr::CK_Complete, 8540 SourceRange()); 8541 if (TempResult.isInvalid()) 8542 return true; 8543 8544 Expr *Temp = TempResult.takeAs<Expr>(); 8545 CheckImplicitConversions(Temp, VD->getLocation()); 8546 MarkDeclarationReferenced(VD->getLocation(), Constructor); 8547 Temp = MaybeCreateExprWithCleanups(Temp); 8548 VD->setInit(Temp); 8549 8550 return false; 8551} 8552 8553void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8554 if (VD->isInvalidDecl()) return; 8555 8556 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8557 if (ClassDecl->isInvalidDecl()) return; 8558 if (ClassDecl->hasTrivialDestructor()) return; 8559 if (ClassDecl->isDependentContext()) return; 8560 8561 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8562 MarkDeclarationReferenced(VD->getLocation(), Destructor); 8563 CheckDestructorAccess(VD->getLocation(), Destructor, 8564 PDiag(diag::err_access_dtor_var) 8565 << VD->getDeclName() 8566 << VD->getType()); 8567 8568 if (!VD->hasGlobalStorage()) return; 8569 8570 // Emit warning for non-trivial dtor in global scope (a real global, 8571 // class-static, function-static). 8572 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8573 8574 // TODO: this should be re-enabled for static locals by !CXAAtExit 8575 if (!VD->isStaticLocal()) 8576 Diag(VD->getLocation(), diag::warn_global_destructor); 8577} 8578 8579/// AddCXXDirectInitializerToDecl - This action is called immediately after 8580/// ActOnDeclarator, when a C++ direct initializer is present. 8581/// e.g: "int x(1);" 8582void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 8583 SourceLocation LParenLoc, 8584 MultiExprArg Exprs, 8585 SourceLocation RParenLoc, 8586 bool TypeMayContainAuto) { 8587 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 8588 8589 // If there is no declaration, there was an error parsing it. Just ignore 8590 // the initializer. 8591 if (RealDecl == 0) 8592 return; 8593 8594 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 8595 if (!VDecl) { 8596 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 8597 RealDecl->setInvalidDecl(); 8598 return; 8599 } 8600 8601 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 8602 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 8603 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 8604 if (Exprs.size() > 1) { 8605 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 8606 diag::err_auto_var_init_multiple_expressions) 8607 << VDecl->getDeclName() << VDecl->getType() 8608 << VDecl->getSourceRange(); 8609 RealDecl->setInvalidDecl(); 8610 return; 8611 } 8612 8613 Expr *Init = Exprs.get()[0]; 8614 TypeSourceInfo *DeducedType = 0; 8615 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 8616 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 8617 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 8618 << Init->getSourceRange(); 8619 if (!DeducedType) { 8620 RealDecl->setInvalidDecl(); 8621 return; 8622 } 8623 VDecl->setTypeSourceInfo(DeducedType); 8624 VDecl->setType(DeducedType->getType()); 8625 8626 // In ARC, infer lifetime. 8627 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 8628 VDecl->setInvalidDecl(); 8629 8630 // If this is a redeclaration, check that the type we just deduced matches 8631 // the previously declared type. 8632 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 8633 MergeVarDeclTypes(VDecl, Old); 8634 } 8635 8636 // We will represent direct-initialization similarly to copy-initialization: 8637 // int x(1); -as-> int x = 1; 8638 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 8639 // 8640 // Clients that want to distinguish between the two forms, can check for 8641 // direct initializer using VarDecl::hasCXXDirectInitializer(). 8642 // A major benefit is that clients that don't particularly care about which 8643 // exactly form was it (like the CodeGen) can handle both cases without 8644 // special case code. 8645 8646 // C++ 8.5p11: 8647 // The form of initialization (using parentheses or '=') is generally 8648 // insignificant, but does matter when the entity being initialized has a 8649 // class type. 8650 8651 if (!VDecl->getType()->isDependentType() && 8652 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 8653 diag::err_typecheck_decl_incomplete_type)) { 8654 VDecl->setInvalidDecl(); 8655 return; 8656 } 8657 8658 // The variable can not have an abstract class type. 8659 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 8660 diag::err_abstract_type_in_decl, 8661 AbstractVariableType)) 8662 VDecl->setInvalidDecl(); 8663 8664 const VarDecl *Def; 8665 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 8666 Diag(VDecl->getLocation(), diag::err_redefinition) 8667 << VDecl->getDeclName(); 8668 Diag(Def->getLocation(), diag::note_previous_definition); 8669 VDecl->setInvalidDecl(); 8670 return; 8671 } 8672 8673 // C++ [class.static.data]p4 8674 // If a static data member is of const integral or const 8675 // enumeration type, its declaration in the class definition can 8676 // specify a constant-initializer which shall be an integral 8677 // constant expression (5.19). In that case, the member can appear 8678 // in integral constant expressions. The member shall still be 8679 // defined in a namespace scope if it is used in the program and the 8680 // namespace scope definition shall not contain an initializer. 8681 // 8682 // We already performed a redefinition check above, but for static 8683 // data members we also need to check whether there was an in-class 8684 // declaration with an initializer. 8685 const VarDecl* PrevInit = 0; 8686 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 8687 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 8688 Diag(PrevInit->getLocation(), diag::note_previous_definition); 8689 return; 8690 } 8691 8692 bool IsDependent = false; 8693 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 8694 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 8695 VDecl->setInvalidDecl(); 8696 return; 8697 } 8698 8699 if (Exprs.get()[I]->isTypeDependent()) 8700 IsDependent = true; 8701 } 8702 8703 // If either the declaration has a dependent type or if any of the 8704 // expressions is type-dependent, we represent the initialization 8705 // via a ParenListExpr for later use during template instantiation. 8706 if (VDecl->getType()->isDependentType() || IsDependent) { 8707 // Let clients know that initialization was done with a direct initializer. 8708 VDecl->setCXXDirectInitializer(true); 8709 8710 // Store the initialization expressions as a ParenListExpr. 8711 unsigned NumExprs = Exprs.size(); 8712 VDecl->setInit(new (Context) ParenListExpr( 8713 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 8714 VDecl->getType().getNonReferenceType())); 8715 return; 8716 } 8717 8718 // Capture the variable that is being initialized and the style of 8719 // initialization. 8720 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 8721 8722 // FIXME: Poor source location information. 8723 InitializationKind Kind 8724 = InitializationKind::CreateDirect(VDecl->getLocation(), 8725 LParenLoc, RParenLoc); 8726 8727 InitializationSequence InitSeq(*this, Entity, Kind, 8728 Exprs.get(), Exprs.size()); 8729 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 8730 if (Result.isInvalid()) { 8731 VDecl->setInvalidDecl(); 8732 return; 8733 } 8734 8735 CheckImplicitConversions(Result.get(), LParenLoc); 8736 8737 Result = MaybeCreateExprWithCleanups(Result); 8738 VDecl->setInit(Result.takeAs<Expr>()); 8739 VDecl->setCXXDirectInitializer(true); 8740 8741 CheckCompleteVariableDeclaration(VDecl); 8742} 8743 8744/// \brief Given a constructor and the set of arguments provided for the 8745/// constructor, convert the arguments and add any required default arguments 8746/// to form a proper call to this constructor. 8747/// 8748/// \returns true if an error occurred, false otherwise. 8749bool 8750Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8751 MultiExprArg ArgsPtr, 8752 SourceLocation Loc, 8753 ASTOwningVector<Expr*> &ConvertedArgs) { 8754 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8755 unsigned NumArgs = ArgsPtr.size(); 8756 Expr **Args = (Expr **)ArgsPtr.get(); 8757 8758 const FunctionProtoType *Proto 8759 = Constructor->getType()->getAs<FunctionProtoType>(); 8760 assert(Proto && "Constructor without a prototype?"); 8761 unsigned NumArgsInProto = Proto->getNumArgs(); 8762 8763 // If too few arguments are available, we'll fill in the rest with defaults. 8764 if (NumArgs < NumArgsInProto) 8765 ConvertedArgs.reserve(NumArgsInProto); 8766 else 8767 ConvertedArgs.reserve(NumArgs); 8768 8769 VariadicCallType CallType = 8770 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 8771 SmallVector<Expr *, 8> AllArgs; 8772 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 8773 Proto, 0, Args, NumArgs, AllArgs, 8774 CallType); 8775 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 8776 ConvertedArgs.push_back(AllArgs[i]); 8777 return Invalid; 8778} 8779 8780static inline bool 8781CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 8782 const FunctionDecl *FnDecl) { 8783 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 8784 if (isa<NamespaceDecl>(DC)) { 8785 return SemaRef.Diag(FnDecl->getLocation(), 8786 diag::err_operator_new_delete_declared_in_namespace) 8787 << FnDecl->getDeclName(); 8788 } 8789 8790 if (isa<TranslationUnitDecl>(DC) && 8791 FnDecl->getStorageClass() == SC_Static) { 8792 return SemaRef.Diag(FnDecl->getLocation(), 8793 diag::err_operator_new_delete_declared_static) 8794 << FnDecl->getDeclName(); 8795 } 8796 8797 return false; 8798} 8799 8800static inline bool 8801CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 8802 CanQualType ExpectedResultType, 8803 CanQualType ExpectedFirstParamType, 8804 unsigned DependentParamTypeDiag, 8805 unsigned InvalidParamTypeDiag) { 8806 QualType ResultType = 8807 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 8808 8809 // Check that the result type is not dependent. 8810 if (ResultType->isDependentType()) 8811 return SemaRef.Diag(FnDecl->getLocation(), 8812 diag::err_operator_new_delete_dependent_result_type) 8813 << FnDecl->getDeclName() << ExpectedResultType; 8814 8815 // Check that the result type is what we expect. 8816 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 8817 return SemaRef.Diag(FnDecl->getLocation(), 8818 diag::err_operator_new_delete_invalid_result_type) 8819 << FnDecl->getDeclName() << ExpectedResultType; 8820 8821 // A function template must have at least 2 parameters. 8822 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 8823 return SemaRef.Diag(FnDecl->getLocation(), 8824 diag::err_operator_new_delete_template_too_few_parameters) 8825 << FnDecl->getDeclName(); 8826 8827 // The function decl must have at least 1 parameter. 8828 if (FnDecl->getNumParams() == 0) 8829 return SemaRef.Diag(FnDecl->getLocation(), 8830 diag::err_operator_new_delete_too_few_parameters) 8831 << FnDecl->getDeclName(); 8832 8833 // Check the the first parameter type is not dependent. 8834 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 8835 if (FirstParamType->isDependentType()) 8836 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 8837 << FnDecl->getDeclName() << ExpectedFirstParamType; 8838 8839 // Check that the first parameter type is what we expect. 8840 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 8841 ExpectedFirstParamType) 8842 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 8843 << FnDecl->getDeclName() << ExpectedFirstParamType; 8844 8845 return false; 8846} 8847 8848static bool 8849CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 8850 // C++ [basic.stc.dynamic.allocation]p1: 8851 // A program is ill-formed if an allocation function is declared in a 8852 // namespace scope other than global scope or declared static in global 8853 // scope. 8854 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 8855 return true; 8856 8857 CanQualType SizeTy = 8858 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 8859 8860 // C++ [basic.stc.dynamic.allocation]p1: 8861 // The return type shall be void*. The first parameter shall have type 8862 // std::size_t. 8863 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 8864 SizeTy, 8865 diag::err_operator_new_dependent_param_type, 8866 diag::err_operator_new_param_type)) 8867 return true; 8868 8869 // C++ [basic.stc.dynamic.allocation]p1: 8870 // The first parameter shall not have an associated default argument. 8871 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 8872 return SemaRef.Diag(FnDecl->getLocation(), 8873 diag::err_operator_new_default_arg) 8874 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 8875 8876 return false; 8877} 8878 8879static bool 8880CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 8881 // C++ [basic.stc.dynamic.deallocation]p1: 8882 // A program is ill-formed if deallocation functions are declared in a 8883 // namespace scope other than global scope or declared static in global 8884 // scope. 8885 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 8886 return true; 8887 8888 // C++ [basic.stc.dynamic.deallocation]p2: 8889 // Each deallocation function shall return void and its first parameter 8890 // shall be void*. 8891 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 8892 SemaRef.Context.VoidPtrTy, 8893 diag::err_operator_delete_dependent_param_type, 8894 diag::err_operator_delete_param_type)) 8895 return true; 8896 8897 return false; 8898} 8899 8900/// CheckOverloadedOperatorDeclaration - Check whether the declaration 8901/// of this overloaded operator is well-formed. If so, returns false; 8902/// otherwise, emits appropriate diagnostics and returns true. 8903bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 8904 assert(FnDecl && FnDecl->isOverloadedOperator() && 8905 "Expected an overloaded operator declaration"); 8906 8907 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 8908 8909 // C++ [over.oper]p5: 8910 // The allocation and deallocation functions, operator new, 8911 // operator new[], operator delete and operator delete[], are 8912 // described completely in 3.7.3. The attributes and restrictions 8913 // found in the rest of this subclause do not apply to them unless 8914 // explicitly stated in 3.7.3. 8915 if (Op == OO_Delete || Op == OO_Array_Delete) 8916 return CheckOperatorDeleteDeclaration(*this, FnDecl); 8917 8918 if (Op == OO_New || Op == OO_Array_New) 8919 return CheckOperatorNewDeclaration(*this, FnDecl); 8920 8921 // C++ [over.oper]p6: 8922 // An operator function shall either be a non-static member 8923 // function or be a non-member function and have at least one 8924 // parameter whose type is a class, a reference to a class, an 8925 // enumeration, or a reference to an enumeration. 8926 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 8927 if (MethodDecl->isStatic()) 8928 return Diag(FnDecl->getLocation(), 8929 diag::err_operator_overload_static) << FnDecl->getDeclName(); 8930 } else { 8931 bool ClassOrEnumParam = false; 8932 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 8933 ParamEnd = FnDecl->param_end(); 8934 Param != ParamEnd; ++Param) { 8935 QualType ParamType = (*Param)->getType().getNonReferenceType(); 8936 if (ParamType->isDependentType() || ParamType->isRecordType() || 8937 ParamType->isEnumeralType()) { 8938 ClassOrEnumParam = true; 8939 break; 8940 } 8941 } 8942 8943 if (!ClassOrEnumParam) 8944 return Diag(FnDecl->getLocation(), 8945 diag::err_operator_overload_needs_class_or_enum) 8946 << FnDecl->getDeclName(); 8947 } 8948 8949 // C++ [over.oper]p8: 8950 // An operator function cannot have default arguments (8.3.6), 8951 // except where explicitly stated below. 8952 // 8953 // Only the function-call operator allows default arguments 8954 // (C++ [over.call]p1). 8955 if (Op != OO_Call) { 8956 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 8957 Param != FnDecl->param_end(); ++Param) { 8958 if ((*Param)->hasDefaultArg()) 8959 return Diag((*Param)->getLocation(), 8960 diag::err_operator_overload_default_arg) 8961 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 8962 } 8963 } 8964 8965 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 8966 { false, false, false } 8967#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 8968 , { Unary, Binary, MemberOnly } 8969#include "clang/Basic/OperatorKinds.def" 8970 }; 8971 8972 bool CanBeUnaryOperator = OperatorUses[Op][0]; 8973 bool CanBeBinaryOperator = OperatorUses[Op][1]; 8974 bool MustBeMemberOperator = OperatorUses[Op][2]; 8975 8976 // C++ [over.oper]p8: 8977 // [...] Operator functions cannot have more or fewer parameters 8978 // than the number required for the corresponding operator, as 8979 // described in the rest of this subclause. 8980 unsigned NumParams = FnDecl->getNumParams() 8981 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 8982 if (Op != OO_Call && 8983 ((NumParams == 1 && !CanBeUnaryOperator) || 8984 (NumParams == 2 && !CanBeBinaryOperator) || 8985 (NumParams < 1) || (NumParams > 2))) { 8986 // We have the wrong number of parameters. 8987 unsigned ErrorKind; 8988 if (CanBeUnaryOperator && CanBeBinaryOperator) { 8989 ErrorKind = 2; // 2 -> unary or binary. 8990 } else if (CanBeUnaryOperator) { 8991 ErrorKind = 0; // 0 -> unary 8992 } else { 8993 assert(CanBeBinaryOperator && 8994 "All non-call overloaded operators are unary or binary!"); 8995 ErrorKind = 1; // 1 -> binary 8996 } 8997 8998 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 8999 << FnDecl->getDeclName() << NumParams << ErrorKind; 9000 } 9001 9002 // Overloaded operators other than operator() cannot be variadic. 9003 if (Op != OO_Call && 9004 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9005 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9006 << FnDecl->getDeclName(); 9007 } 9008 9009 // Some operators must be non-static member functions. 9010 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9011 return Diag(FnDecl->getLocation(), 9012 diag::err_operator_overload_must_be_member) 9013 << FnDecl->getDeclName(); 9014 } 9015 9016 // C++ [over.inc]p1: 9017 // The user-defined function called operator++ implements the 9018 // prefix and postfix ++ operator. If this function is a member 9019 // function with no parameters, or a non-member function with one 9020 // parameter of class or enumeration type, it defines the prefix 9021 // increment operator ++ for objects of that type. If the function 9022 // is a member function with one parameter (which shall be of type 9023 // int) or a non-member function with two parameters (the second 9024 // of which shall be of type int), it defines the postfix 9025 // increment operator ++ for objects of that type. 9026 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9027 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9028 bool ParamIsInt = false; 9029 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9030 ParamIsInt = BT->getKind() == BuiltinType::Int; 9031 9032 if (!ParamIsInt) 9033 return Diag(LastParam->getLocation(), 9034 diag::err_operator_overload_post_incdec_must_be_int) 9035 << LastParam->getType() << (Op == OO_MinusMinus); 9036 } 9037 9038 return false; 9039} 9040 9041/// CheckLiteralOperatorDeclaration - Check whether the declaration 9042/// of this literal operator function is well-formed. If so, returns 9043/// false; otherwise, emits appropriate diagnostics and returns true. 9044bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9045 DeclContext *DC = FnDecl->getDeclContext(); 9046 Decl::Kind Kind = DC->getDeclKind(); 9047 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9048 Kind != Decl::LinkageSpec) { 9049 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9050 << FnDecl->getDeclName(); 9051 return true; 9052 } 9053 9054 bool Valid = false; 9055 9056 // template <char...> type operator "" name() is the only valid template 9057 // signature, and the only valid signature with no parameters. 9058 if (FnDecl->param_size() == 0) { 9059 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9060 // Must have only one template parameter 9061 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9062 if (Params->size() == 1) { 9063 NonTypeTemplateParmDecl *PmDecl = 9064 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9065 9066 // The template parameter must be a char parameter pack. 9067 if (PmDecl && PmDecl->isTemplateParameterPack() && 9068 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9069 Valid = true; 9070 } 9071 } 9072 } else { 9073 // Check the first parameter 9074 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9075 9076 QualType T = (*Param)->getType(); 9077 9078 // unsigned long long int, long double, and any character type are allowed 9079 // as the only parameters. 9080 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9081 Context.hasSameType(T, Context.LongDoubleTy) || 9082 Context.hasSameType(T, Context.CharTy) || 9083 Context.hasSameType(T, Context.WCharTy) || 9084 Context.hasSameType(T, Context.Char16Ty) || 9085 Context.hasSameType(T, Context.Char32Ty)) { 9086 if (++Param == FnDecl->param_end()) 9087 Valid = true; 9088 goto FinishedParams; 9089 } 9090 9091 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9092 const PointerType *PT = T->getAs<PointerType>(); 9093 if (!PT) 9094 goto FinishedParams; 9095 T = PT->getPointeeType(); 9096 if (!T.isConstQualified()) 9097 goto FinishedParams; 9098 T = T.getUnqualifiedType(); 9099 9100 // Move on to the second parameter; 9101 ++Param; 9102 9103 // If there is no second parameter, the first must be a const char * 9104 if (Param == FnDecl->param_end()) { 9105 if (Context.hasSameType(T, Context.CharTy)) 9106 Valid = true; 9107 goto FinishedParams; 9108 } 9109 9110 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9111 // are allowed as the first parameter to a two-parameter function 9112 if (!(Context.hasSameType(T, Context.CharTy) || 9113 Context.hasSameType(T, Context.WCharTy) || 9114 Context.hasSameType(T, Context.Char16Ty) || 9115 Context.hasSameType(T, Context.Char32Ty))) 9116 goto FinishedParams; 9117 9118 // The second and final parameter must be an std::size_t 9119 T = (*Param)->getType().getUnqualifiedType(); 9120 if (Context.hasSameType(T, Context.getSizeType()) && 9121 ++Param == FnDecl->param_end()) 9122 Valid = true; 9123 } 9124 9125 // FIXME: This diagnostic is absolutely terrible. 9126FinishedParams: 9127 if (!Valid) { 9128 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9129 << FnDecl->getDeclName(); 9130 return true; 9131 } 9132 9133 StringRef LiteralName 9134 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9135 if (LiteralName[0] != '_') { 9136 // C++0x [usrlit.suffix]p1: 9137 // Literal suffix identifiers that do not start with an underscore are 9138 // reserved for future standardization. 9139 bool IsHexFloat = true; 9140 if (LiteralName.size() > 1 && 9141 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9142 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9143 if (!isdigit(LiteralName[I])) { 9144 IsHexFloat = false; 9145 break; 9146 } 9147 } 9148 } 9149 9150 if (IsHexFloat) 9151 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9152 << LiteralName; 9153 else 9154 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9155 } 9156 9157 return false; 9158} 9159 9160/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9161/// linkage specification, including the language and (if present) 9162/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9163/// the location of the language string literal, which is provided 9164/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9165/// the '{' brace. Otherwise, this linkage specification does not 9166/// have any braces. 9167Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9168 SourceLocation LangLoc, 9169 StringRef Lang, 9170 SourceLocation LBraceLoc) { 9171 LinkageSpecDecl::LanguageIDs Language; 9172 if (Lang == "\"C\"") 9173 Language = LinkageSpecDecl::lang_c; 9174 else if (Lang == "\"C++\"") 9175 Language = LinkageSpecDecl::lang_cxx; 9176 else { 9177 Diag(LangLoc, diag::err_bad_language); 9178 return 0; 9179 } 9180 9181 // FIXME: Add all the various semantics of linkage specifications 9182 9183 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9184 ExternLoc, LangLoc, Language); 9185 CurContext->addDecl(D); 9186 PushDeclContext(S, D); 9187 return D; 9188} 9189 9190/// ActOnFinishLinkageSpecification - Complete the definition of 9191/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9192/// valid, it's the position of the closing '}' brace in a linkage 9193/// specification that uses braces. 9194Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9195 Decl *LinkageSpec, 9196 SourceLocation RBraceLoc) { 9197 if (LinkageSpec) { 9198 if (RBraceLoc.isValid()) { 9199 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9200 LSDecl->setRBraceLoc(RBraceLoc); 9201 } 9202 PopDeclContext(); 9203 } 9204 return LinkageSpec; 9205} 9206 9207/// \brief Perform semantic analysis for the variable declaration that 9208/// occurs within a C++ catch clause, returning the newly-created 9209/// variable. 9210VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9211 TypeSourceInfo *TInfo, 9212 SourceLocation StartLoc, 9213 SourceLocation Loc, 9214 IdentifierInfo *Name) { 9215 bool Invalid = false; 9216 QualType ExDeclType = TInfo->getType(); 9217 9218 // Arrays and functions decay. 9219 if (ExDeclType->isArrayType()) 9220 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9221 else if (ExDeclType->isFunctionType()) 9222 ExDeclType = Context.getPointerType(ExDeclType); 9223 9224 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9225 // The exception-declaration shall not denote a pointer or reference to an 9226 // incomplete type, other than [cv] void*. 9227 // N2844 forbids rvalue references. 9228 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9229 Diag(Loc, diag::err_catch_rvalue_ref); 9230 Invalid = true; 9231 } 9232 9233 // GCC allows catching pointers and references to incomplete types 9234 // as an extension; so do we, but we warn by default. 9235 9236 QualType BaseType = ExDeclType; 9237 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9238 unsigned DK = diag::err_catch_incomplete; 9239 bool IncompleteCatchIsInvalid = true; 9240 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9241 BaseType = Ptr->getPointeeType(); 9242 Mode = 1; 9243 DK = diag::ext_catch_incomplete_ptr; 9244 IncompleteCatchIsInvalid = false; 9245 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9246 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9247 BaseType = Ref->getPointeeType(); 9248 Mode = 2; 9249 DK = diag::ext_catch_incomplete_ref; 9250 IncompleteCatchIsInvalid = false; 9251 } 9252 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9253 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 9254 IncompleteCatchIsInvalid) 9255 Invalid = true; 9256 9257 if (!Invalid && !ExDeclType->isDependentType() && 9258 RequireNonAbstractType(Loc, ExDeclType, 9259 diag::err_abstract_type_in_decl, 9260 AbstractVariableType)) 9261 Invalid = true; 9262 9263 // Only the non-fragile NeXT runtime currently supports C++ catches 9264 // of ObjC types, and no runtime supports catching ObjC types by value. 9265 if (!Invalid && getLangOptions().ObjC1) { 9266 QualType T = ExDeclType; 9267 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9268 T = RT->getPointeeType(); 9269 9270 if (T->isObjCObjectType()) { 9271 Diag(Loc, diag::err_objc_object_catch); 9272 Invalid = true; 9273 } else if (T->isObjCObjectPointerType()) { 9274 if (!getLangOptions().ObjCNonFragileABI) 9275 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9276 } 9277 } 9278 9279 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9280 ExDeclType, TInfo, SC_None, SC_None); 9281 ExDecl->setExceptionVariable(true); 9282 9283 if (!Invalid && !ExDeclType->isDependentType()) { 9284 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9285 // C++ [except.handle]p16: 9286 // The object declared in an exception-declaration or, if the 9287 // exception-declaration does not specify a name, a temporary (12.2) is 9288 // copy-initialized (8.5) from the exception object. [...] 9289 // The object is destroyed when the handler exits, after the destruction 9290 // of any automatic objects initialized within the handler. 9291 // 9292 // We just pretend to initialize the object with itself, then make sure 9293 // it can be destroyed later. 9294 QualType initType = ExDeclType; 9295 9296 InitializedEntity entity = 9297 InitializedEntity::InitializeVariable(ExDecl); 9298 InitializationKind initKind = 9299 InitializationKind::CreateCopy(Loc, SourceLocation()); 9300 9301 Expr *opaqueValue = 9302 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9303 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9304 ExprResult result = sequence.Perform(*this, entity, initKind, 9305 MultiExprArg(&opaqueValue, 1)); 9306 if (result.isInvalid()) 9307 Invalid = true; 9308 else { 9309 // If the constructor used was non-trivial, set this as the 9310 // "initializer". 9311 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9312 if (!construct->getConstructor()->isTrivial()) { 9313 Expr *init = MaybeCreateExprWithCleanups(construct); 9314 ExDecl->setInit(init); 9315 } 9316 9317 // And make sure it's destructable. 9318 FinalizeVarWithDestructor(ExDecl, recordType); 9319 } 9320 } 9321 } 9322 9323 if (Invalid) 9324 ExDecl->setInvalidDecl(); 9325 9326 return ExDecl; 9327} 9328 9329/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9330/// handler. 9331Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9332 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9333 bool Invalid = D.isInvalidType(); 9334 9335 // Check for unexpanded parameter packs. 9336 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9337 UPPC_ExceptionType)) { 9338 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9339 D.getIdentifierLoc()); 9340 Invalid = true; 9341 } 9342 9343 IdentifierInfo *II = D.getIdentifier(); 9344 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9345 LookupOrdinaryName, 9346 ForRedeclaration)) { 9347 // The scope should be freshly made just for us. There is just no way 9348 // it contains any previous declaration. 9349 assert(!S->isDeclScope(PrevDecl)); 9350 if (PrevDecl->isTemplateParameter()) { 9351 // Maybe we will complain about the shadowed template parameter. 9352 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9353 } 9354 } 9355 9356 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9357 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9358 << D.getCXXScopeSpec().getRange(); 9359 Invalid = true; 9360 } 9361 9362 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9363 D.getSourceRange().getBegin(), 9364 D.getIdentifierLoc(), 9365 D.getIdentifier()); 9366 if (Invalid) 9367 ExDecl->setInvalidDecl(); 9368 9369 // Add the exception declaration into this scope. 9370 if (II) 9371 PushOnScopeChains(ExDecl, S); 9372 else 9373 CurContext->addDecl(ExDecl); 9374 9375 ProcessDeclAttributes(S, ExDecl, D); 9376 return ExDecl; 9377} 9378 9379Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9380 Expr *AssertExpr, 9381 Expr *AssertMessageExpr_, 9382 SourceLocation RParenLoc) { 9383 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9384 9385 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9386 llvm::APSInt Value(32); 9387 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 9388 Diag(StaticAssertLoc, 9389 diag::err_static_assert_expression_is_not_constant) << 9390 AssertExpr->getSourceRange(); 9391 return 0; 9392 } 9393 9394 if (Value == 0) { 9395 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9396 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9397 } 9398 } 9399 9400 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9401 return 0; 9402 9403 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9404 AssertExpr, AssertMessage, RParenLoc); 9405 9406 CurContext->addDecl(Decl); 9407 return Decl; 9408} 9409 9410/// \brief Perform semantic analysis of the given friend type declaration. 9411/// 9412/// \returns A friend declaration that. 9413FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 9414 TypeSourceInfo *TSInfo) { 9415 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9416 9417 QualType T = TSInfo->getType(); 9418 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9419 9420 if (!getLangOptions().CPlusPlus0x) { 9421 // C++03 [class.friend]p2: 9422 // An elaborated-type-specifier shall be used in a friend declaration 9423 // for a class.* 9424 // 9425 // * The class-key of the elaborated-type-specifier is required. 9426 if (!ActiveTemplateInstantiations.empty()) { 9427 // Do not complain about the form of friend template types during 9428 // template instantiation; we will already have complained when the 9429 // template was declared. 9430 } else if (!T->isElaboratedTypeSpecifier()) { 9431 // If we evaluated the type to a record type, suggest putting 9432 // a tag in front. 9433 if (const RecordType *RT = T->getAs<RecordType>()) { 9434 RecordDecl *RD = RT->getDecl(); 9435 9436 std::string InsertionText = std::string(" ") + RD->getKindName(); 9437 9438 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 9439 << (unsigned) RD->getTagKind() 9440 << T 9441 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9442 InsertionText); 9443 } else { 9444 Diag(FriendLoc, diag::ext_nonclass_type_friend) 9445 << T 9446 << SourceRange(FriendLoc, TypeRange.getEnd()); 9447 } 9448 } else if (T->getAs<EnumType>()) { 9449 Diag(FriendLoc, diag::ext_enum_friend) 9450 << T 9451 << SourceRange(FriendLoc, TypeRange.getEnd()); 9452 } 9453 } 9454 9455 // C++0x [class.friend]p3: 9456 // If the type specifier in a friend declaration designates a (possibly 9457 // cv-qualified) class type, that class is declared as a friend; otherwise, 9458 // the friend declaration is ignored. 9459 9460 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9461 // in [class.friend]p3 that we do not implement. 9462 9463 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 9464} 9465 9466/// Handle a friend tag declaration where the scope specifier was 9467/// templated. 9468Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9469 unsigned TagSpec, SourceLocation TagLoc, 9470 CXXScopeSpec &SS, 9471 IdentifierInfo *Name, SourceLocation NameLoc, 9472 AttributeList *Attr, 9473 MultiTemplateParamsArg TempParamLists) { 9474 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9475 9476 bool isExplicitSpecialization = false; 9477 bool Invalid = false; 9478 9479 if (TemplateParameterList *TemplateParams 9480 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9481 TempParamLists.get(), 9482 TempParamLists.size(), 9483 /*friend*/ true, 9484 isExplicitSpecialization, 9485 Invalid)) { 9486 if (TemplateParams->size() > 0) { 9487 // This is a declaration of a class template. 9488 if (Invalid) 9489 return 0; 9490 9491 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9492 SS, Name, NameLoc, Attr, 9493 TemplateParams, AS_public, 9494 /*ModulePrivateLoc=*/SourceLocation(), 9495 TempParamLists.size() - 1, 9496 (TemplateParameterList**) TempParamLists.release()).take(); 9497 } else { 9498 // The "template<>" header is extraneous. 9499 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9500 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9501 isExplicitSpecialization = true; 9502 } 9503 } 9504 9505 if (Invalid) return 0; 9506 9507 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9508 9509 bool isAllExplicitSpecializations = true; 9510 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9511 if (TempParamLists.get()[I]->size()) { 9512 isAllExplicitSpecializations = false; 9513 break; 9514 } 9515 } 9516 9517 // FIXME: don't ignore attributes. 9518 9519 // If it's explicit specializations all the way down, just forget 9520 // about the template header and build an appropriate non-templated 9521 // friend. TODO: for source fidelity, remember the headers. 9522 if (isAllExplicitSpecializations) { 9523 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9524 ElaboratedTypeKeyword Keyword 9525 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9526 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9527 *Name, NameLoc); 9528 if (T.isNull()) 9529 return 0; 9530 9531 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9532 if (isa<DependentNameType>(T)) { 9533 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9534 TL.setKeywordLoc(TagLoc); 9535 TL.setQualifierLoc(QualifierLoc); 9536 TL.setNameLoc(NameLoc); 9537 } else { 9538 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9539 TL.setKeywordLoc(TagLoc); 9540 TL.setQualifierLoc(QualifierLoc); 9541 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9542 } 9543 9544 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9545 TSI, FriendLoc); 9546 Friend->setAccess(AS_public); 9547 CurContext->addDecl(Friend); 9548 return Friend; 9549 } 9550 9551 // Handle the case of a templated-scope friend class. e.g. 9552 // template <class T> class A<T>::B; 9553 // FIXME: we don't support these right now. 9554 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9555 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9556 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9557 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9558 TL.setKeywordLoc(TagLoc); 9559 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9560 TL.setNameLoc(NameLoc); 9561 9562 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9563 TSI, FriendLoc); 9564 Friend->setAccess(AS_public); 9565 Friend->setUnsupportedFriend(true); 9566 CurContext->addDecl(Friend); 9567 return Friend; 9568} 9569 9570 9571/// Handle a friend type declaration. This works in tandem with 9572/// ActOnTag. 9573/// 9574/// Notes on friend class templates: 9575/// 9576/// We generally treat friend class declarations as if they were 9577/// declaring a class. So, for example, the elaborated type specifier 9578/// in a friend declaration is required to obey the restrictions of a 9579/// class-head (i.e. no typedefs in the scope chain), template 9580/// parameters are required to match up with simple template-ids, &c. 9581/// However, unlike when declaring a template specialization, it's 9582/// okay to refer to a template specialization without an empty 9583/// template parameter declaration, e.g. 9584/// friend class A<T>::B<unsigned>; 9585/// We permit this as a special case; if there are any template 9586/// parameters present at all, require proper matching, i.e. 9587/// template <> template <class T> friend class A<int>::B; 9588Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9589 MultiTemplateParamsArg TempParams) { 9590 SourceLocation Loc = DS.getSourceRange().getBegin(); 9591 9592 assert(DS.isFriendSpecified()); 9593 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9594 9595 // Try to convert the decl specifier to a type. This works for 9596 // friend templates because ActOnTag never produces a ClassTemplateDecl 9597 // for a TUK_Friend. 9598 Declarator TheDeclarator(DS, Declarator::MemberContext); 9599 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9600 QualType T = TSI->getType(); 9601 if (TheDeclarator.isInvalidType()) 9602 return 0; 9603 9604 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9605 return 0; 9606 9607 // This is definitely an error in C++98. It's probably meant to 9608 // be forbidden in C++0x, too, but the specification is just 9609 // poorly written. 9610 // 9611 // The problem is with declarations like the following: 9612 // template <T> friend A<T>::foo; 9613 // where deciding whether a class C is a friend or not now hinges 9614 // on whether there exists an instantiation of A that causes 9615 // 'foo' to equal C. There are restrictions on class-heads 9616 // (which we declare (by fiat) elaborated friend declarations to 9617 // be) that makes this tractable. 9618 // 9619 // FIXME: handle "template <> friend class A<T>;", which 9620 // is possibly well-formed? Who even knows? 9621 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9622 Diag(Loc, diag::err_tagless_friend_type_template) 9623 << DS.getSourceRange(); 9624 return 0; 9625 } 9626 9627 // C++98 [class.friend]p1: A friend of a class is a function 9628 // or class that is not a member of the class . . . 9629 // This is fixed in DR77, which just barely didn't make the C++03 9630 // deadline. It's also a very silly restriction that seriously 9631 // affects inner classes and which nobody else seems to implement; 9632 // thus we never diagnose it, not even in -pedantic. 9633 // 9634 // But note that we could warn about it: it's always useless to 9635 // friend one of your own members (it's not, however, worthless to 9636 // friend a member of an arbitrary specialization of your template). 9637 9638 Decl *D; 9639 if (unsigned NumTempParamLists = TempParams.size()) 9640 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9641 NumTempParamLists, 9642 TempParams.release(), 9643 TSI, 9644 DS.getFriendSpecLoc()); 9645 else 9646 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 9647 9648 if (!D) 9649 return 0; 9650 9651 D->setAccess(AS_public); 9652 CurContext->addDecl(D); 9653 9654 return D; 9655} 9656 9657Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 9658 MultiTemplateParamsArg TemplateParams) { 9659 const DeclSpec &DS = D.getDeclSpec(); 9660 9661 assert(DS.isFriendSpecified()); 9662 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9663 9664 SourceLocation Loc = D.getIdentifierLoc(); 9665 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9666 QualType T = TInfo->getType(); 9667 9668 // C++ [class.friend]p1 9669 // A friend of a class is a function or class.... 9670 // Note that this sees through typedefs, which is intended. 9671 // It *doesn't* see through dependent types, which is correct 9672 // according to [temp.arg.type]p3: 9673 // If a declaration acquires a function type through a 9674 // type dependent on a template-parameter and this causes 9675 // a declaration that does not use the syntactic form of a 9676 // function declarator to have a function type, the program 9677 // is ill-formed. 9678 if (!T->isFunctionType()) { 9679 Diag(Loc, diag::err_unexpected_friend); 9680 9681 // It might be worthwhile to try to recover by creating an 9682 // appropriate declaration. 9683 return 0; 9684 } 9685 9686 // C++ [namespace.memdef]p3 9687 // - If a friend declaration in a non-local class first declares a 9688 // class or function, the friend class or function is a member 9689 // of the innermost enclosing namespace. 9690 // - The name of the friend is not found by simple name lookup 9691 // until a matching declaration is provided in that namespace 9692 // scope (either before or after the class declaration granting 9693 // friendship). 9694 // - If a friend function is called, its name may be found by the 9695 // name lookup that considers functions from namespaces and 9696 // classes associated with the types of the function arguments. 9697 // - When looking for a prior declaration of a class or a function 9698 // declared as a friend, scopes outside the innermost enclosing 9699 // namespace scope are not considered. 9700 9701 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9702 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9703 DeclarationName Name = NameInfo.getName(); 9704 assert(Name); 9705 9706 // Check for unexpanded parameter packs. 9707 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9708 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9709 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9710 return 0; 9711 9712 // The context we found the declaration in, or in which we should 9713 // create the declaration. 9714 DeclContext *DC; 9715 Scope *DCScope = S; 9716 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9717 ForRedeclaration); 9718 9719 // FIXME: there are different rules in local classes 9720 9721 // There are four cases here. 9722 // - There's no scope specifier, in which case we just go to the 9723 // appropriate scope and look for a function or function template 9724 // there as appropriate. 9725 // Recover from invalid scope qualifiers as if they just weren't there. 9726 if (SS.isInvalid() || !SS.isSet()) { 9727 // C++0x [namespace.memdef]p3: 9728 // If the name in a friend declaration is neither qualified nor 9729 // a template-id and the declaration is a function or an 9730 // elaborated-type-specifier, the lookup to determine whether 9731 // the entity has been previously declared shall not consider 9732 // any scopes outside the innermost enclosing namespace. 9733 // C++0x [class.friend]p11: 9734 // If a friend declaration appears in a local class and the name 9735 // specified is an unqualified name, a prior declaration is 9736 // looked up without considering scopes that are outside the 9737 // innermost enclosing non-class scope. For a friend function 9738 // declaration, if there is no prior declaration, the program is 9739 // ill-formed. 9740 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9741 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9742 9743 // Find the appropriate context according to the above. 9744 DC = CurContext; 9745 while (true) { 9746 // Skip class contexts. If someone can cite chapter and verse 9747 // for this behavior, that would be nice --- it's what GCC and 9748 // EDG do, and it seems like a reasonable intent, but the spec 9749 // really only says that checks for unqualified existing 9750 // declarations should stop at the nearest enclosing namespace, 9751 // not that they should only consider the nearest enclosing 9752 // namespace. 9753 while (DC->isRecord()) 9754 DC = DC->getParent(); 9755 9756 LookupQualifiedName(Previous, DC); 9757 9758 // TODO: decide what we think about using declarations. 9759 if (isLocal || !Previous.empty()) 9760 break; 9761 9762 if (isTemplateId) { 9763 if (isa<TranslationUnitDecl>(DC)) break; 9764 } else { 9765 if (DC->isFileContext()) break; 9766 } 9767 DC = DC->getParent(); 9768 } 9769 9770 // C++ [class.friend]p1: A friend of a class is a function or 9771 // class that is not a member of the class . . . 9772 // C++0x changes this for both friend types and functions. 9773 // Most C++ 98 compilers do seem to give an error here, so 9774 // we do, too. 9775 if (!Previous.empty() && DC->Equals(CurContext) 9776 && !getLangOptions().CPlusPlus0x) 9777 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 9778 9779 DCScope = getScopeForDeclContext(S, DC); 9780 9781 // - There's a non-dependent scope specifier, in which case we 9782 // compute it and do a previous lookup there for a function 9783 // or function template. 9784 } else if (!SS.getScopeRep()->isDependent()) { 9785 DC = computeDeclContext(SS); 9786 if (!DC) return 0; 9787 9788 if (RequireCompleteDeclContext(SS, DC)) return 0; 9789 9790 LookupQualifiedName(Previous, DC); 9791 9792 // Ignore things found implicitly in the wrong scope. 9793 // TODO: better diagnostics for this case. Suggesting the right 9794 // qualified scope would be nice... 9795 LookupResult::Filter F = Previous.makeFilter(); 9796 while (F.hasNext()) { 9797 NamedDecl *D = F.next(); 9798 if (!DC->InEnclosingNamespaceSetOf( 9799 D->getDeclContext()->getRedeclContext())) 9800 F.erase(); 9801 } 9802 F.done(); 9803 9804 if (Previous.empty()) { 9805 D.setInvalidType(); 9806 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 9807 return 0; 9808 } 9809 9810 // C++ [class.friend]p1: A friend of a class is a function or 9811 // class that is not a member of the class . . . 9812 if (DC->Equals(CurContext)) 9813 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 9814 9815 // - There's a scope specifier that does not match any template 9816 // parameter lists, in which case we use some arbitrary context, 9817 // create a method or method template, and wait for instantiation. 9818 // - There's a scope specifier that does match some template 9819 // parameter lists, which we don't handle right now. 9820 } else { 9821 DC = CurContext; 9822 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 9823 } 9824 9825 if (!DC->isRecord()) { 9826 // This implies that it has to be an operator or function. 9827 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 9828 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 9829 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 9830 Diag(Loc, diag::err_introducing_special_friend) << 9831 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 9832 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 9833 return 0; 9834 } 9835 } 9836 9837 bool Redeclaration = false; 9838 bool AddToScope = true; 9839 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 9840 move(TemplateParams), 9841 IsDefinition, 9842 Redeclaration, AddToScope); 9843 if (!ND) return 0; 9844 9845 assert(ND->getDeclContext() == DC); 9846 assert(ND->getLexicalDeclContext() == CurContext); 9847 9848 // Add the function declaration to the appropriate lookup tables, 9849 // adjusting the redeclarations list as necessary. We don't 9850 // want to do this yet if the friending class is dependent. 9851 // 9852 // Also update the scope-based lookup if the target context's 9853 // lookup context is in lexical scope. 9854 if (!CurContext->isDependentContext()) { 9855 DC = DC->getRedeclContext(); 9856 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 9857 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 9858 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 9859 } 9860 9861 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 9862 D.getIdentifierLoc(), ND, 9863 DS.getFriendSpecLoc()); 9864 FrD->setAccess(AS_public); 9865 CurContext->addDecl(FrD); 9866 9867 if (ND->isInvalidDecl()) 9868 FrD->setInvalidDecl(); 9869 else { 9870 FunctionDecl *FD; 9871 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 9872 FD = FTD->getTemplatedDecl(); 9873 else 9874 FD = cast<FunctionDecl>(ND); 9875 9876 // Mark templated-scope function declarations as unsupported. 9877 if (FD->getNumTemplateParameterLists()) 9878 FrD->setUnsupportedFriend(true); 9879 } 9880 9881 return ND; 9882} 9883 9884void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 9885 AdjustDeclIfTemplate(Dcl); 9886 9887 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 9888 if (!Fn) { 9889 Diag(DelLoc, diag::err_deleted_non_function); 9890 return; 9891 } 9892 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 9893 Diag(DelLoc, diag::err_deleted_decl_not_first); 9894 Diag(Prev->getLocation(), diag::note_previous_declaration); 9895 // If the declaration wasn't the first, we delete the function anyway for 9896 // recovery. 9897 } 9898 Fn->setDeletedAsWritten(); 9899} 9900 9901void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 9902 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 9903 9904 if (MD) { 9905 if (MD->getParent()->isDependentType()) { 9906 MD->setDefaulted(); 9907 MD->setExplicitlyDefaulted(); 9908 return; 9909 } 9910 9911 CXXSpecialMember Member = getSpecialMember(MD); 9912 if (Member == CXXInvalid) { 9913 Diag(DefaultLoc, diag::err_default_special_members); 9914 return; 9915 } 9916 9917 MD->setDefaulted(); 9918 MD->setExplicitlyDefaulted(); 9919 9920 // If this definition appears within the record, do the checking when 9921 // the record is complete. 9922 const FunctionDecl *Primary = MD; 9923 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 9924 // Find the uninstantiated declaration that actually had the '= default' 9925 // on it. 9926 MD->getTemplateInstantiationPattern()->isDefined(Primary); 9927 9928 if (Primary == Primary->getCanonicalDecl()) 9929 return; 9930 9931 switch (Member) { 9932 case CXXDefaultConstructor: { 9933 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9934 CheckExplicitlyDefaultedDefaultConstructor(CD); 9935 if (!CD->isInvalidDecl()) 9936 DefineImplicitDefaultConstructor(DefaultLoc, CD); 9937 break; 9938 } 9939 9940 case CXXCopyConstructor: { 9941 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9942 CheckExplicitlyDefaultedCopyConstructor(CD); 9943 if (!CD->isInvalidDecl()) 9944 DefineImplicitCopyConstructor(DefaultLoc, CD); 9945 break; 9946 } 9947 9948 case CXXCopyAssignment: { 9949 CheckExplicitlyDefaultedCopyAssignment(MD); 9950 if (!MD->isInvalidDecl()) 9951 DefineImplicitCopyAssignment(DefaultLoc, MD); 9952 break; 9953 } 9954 9955 case CXXDestructor: { 9956 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 9957 CheckExplicitlyDefaultedDestructor(DD); 9958 if (!DD->isInvalidDecl()) 9959 DefineImplicitDestructor(DefaultLoc, DD); 9960 break; 9961 } 9962 9963 case CXXMoveConstructor: { 9964 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 9965 CheckExplicitlyDefaultedMoveConstructor(CD); 9966 if (!CD->isInvalidDecl()) 9967 DefineImplicitMoveConstructor(DefaultLoc, CD); 9968 break; 9969 } 9970 9971 case CXXMoveAssignment: { 9972 CheckExplicitlyDefaultedMoveAssignment(MD); 9973 if (!MD->isInvalidDecl()) 9974 DefineImplicitMoveAssignment(DefaultLoc, MD); 9975 break; 9976 } 9977 9978 case CXXInvalid: 9979 assert(false && "Invalid special member."); 9980 break; 9981 } 9982 } else { 9983 Diag(DefaultLoc, diag::err_default_special_members); 9984 } 9985} 9986 9987static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 9988 for (Stmt::child_range CI = S->children(); CI; ++CI) { 9989 Stmt *SubStmt = *CI; 9990 if (!SubStmt) 9991 continue; 9992 if (isa<ReturnStmt>(SubStmt)) 9993 Self.Diag(SubStmt->getSourceRange().getBegin(), 9994 diag::err_return_in_constructor_handler); 9995 if (!isa<Expr>(SubStmt)) 9996 SearchForReturnInStmt(Self, SubStmt); 9997 } 9998} 9999 10000void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10001 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10002 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10003 SearchForReturnInStmt(*this, Handler); 10004 } 10005} 10006 10007bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10008 const CXXMethodDecl *Old) { 10009 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10010 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10011 10012 if (Context.hasSameType(NewTy, OldTy) || 10013 NewTy->isDependentType() || OldTy->isDependentType()) 10014 return false; 10015 10016 // Check if the return types are covariant 10017 QualType NewClassTy, OldClassTy; 10018 10019 /// Both types must be pointers or references to classes. 10020 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10021 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10022 NewClassTy = NewPT->getPointeeType(); 10023 OldClassTy = OldPT->getPointeeType(); 10024 } 10025 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10026 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10027 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10028 NewClassTy = NewRT->getPointeeType(); 10029 OldClassTy = OldRT->getPointeeType(); 10030 } 10031 } 10032 } 10033 10034 // The return types aren't either both pointers or references to a class type. 10035 if (NewClassTy.isNull()) { 10036 Diag(New->getLocation(), 10037 diag::err_different_return_type_for_overriding_virtual_function) 10038 << New->getDeclName() << NewTy << OldTy; 10039 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10040 10041 return true; 10042 } 10043 10044 // C++ [class.virtual]p6: 10045 // If the return type of D::f differs from the return type of B::f, the 10046 // class type in the return type of D::f shall be complete at the point of 10047 // declaration of D::f or shall be the class type D. 10048 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10049 if (!RT->isBeingDefined() && 10050 RequireCompleteType(New->getLocation(), NewClassTy, 10051 PDiag(diag::err_covariant_return_incomplete) 10052 << New->getDeclName())) 10053 return true; 10054 } 10055 10056 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10057 // Check if the new class derives from the old class. 10058 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10059 Diag(New->getLocation(), 10060 diag::err_covariant_return_not_derived) 10061 << New->getDeclName() << NewTy << OldTy; 10062 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10063 return true; 10064 } 10065 10066 // Check if we the conversion from derived to base is valid. 10067 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10068 diag::err_covariant_return_inaccessible_base, 10069 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10070 // FIXME: Should this point to the return type? 10071 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10072 // FIXME: this note won't trigger for delayed access control 10073 // diagnostics, and it's impossible to get an undelayed error 10074 // here from access control during the original parse because 10075 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10076 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10077 return true; 10078 } 10079 } 10080 10081 // The qualifiers of the return types must be the same. 10082 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10083 Diag(New->getLocation(), 10084 diag::err_covariant_return_type_different_qualifications) 10085 << New->getDeclName() << NewTy << OldTy; 10086 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10087 return true; 10088 }; 10089 10090 10091 // The new class type must have the same or less qualifiers as the old type. 10092 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10093 Diag(New->getLocation(), 10094 diag::err_covariant_return_type_class_type_more_qualified) 10095 << New->getDeclName() << NewTy << OldTy; 10096 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10097 return true; 10098 }; 10099 10100 return false; 10101} 10102 10103/// \brief Mark the given method pure. 10104/// 10105/// \param Method the method to be marked pure. 10106/// 10107/// \param InitRange the source range that covers the "0" initializer. 10108bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10109 SourceLocation EndLoc = InitRange.getEnd(); 10110 if (EndLoc.isValid()) 10111 Method->setRangeEnd(EndLoc); 10112 10113 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10114 Method->setPure(); 10115 return false; 10116 } 10117 10118 if (!Method->isInvalidDecl()) 10119 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10120 << Method->getDeclName() << InitRange; 10121 return true; 10122} 10123 10124/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10125/// an initializer for the out-of-line declaration 'Dcl'. The scope 10126/// is a fresh scope pushed for just this purpose. 10127/// 10128/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10129/// static data member of class X, names should be looked up in the scope of 10130/// class X. 10131void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10132 // If there is no declaration, there was an error parsing it. 10133 if (D == 0 || D->isInvalidDecl()) return; 10134 10135 // We should only get called for declarations with scope specifiers, like: 10136 // int foo::bar; 10137 assert(D->isOutOfLine()); 10138 EnterDeclaratorContext(S, D->getDeclContext()); 10139} 10140 10141/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10142/// initializer for the out-of-line declaration 'D'. 10143void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10144 // If there is no declaration, there was an error parsing it. 10145 if (D == 0 || D->isInvalidDecl()) return; 10146 10147 assert(D->isOutOfLine()); 10148 ExitDeclaratorContext(S); 10149} 10150 10151/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10152/// C++ if/switch/while/for statement. 10153/// e.g: "if (int x = f()) {...}" 10154DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10155 // C++ 6.4p2: 10156 // The declarator shall not specify a function or an array. 10157 // The type-specifier-seq shall not contain typedef and shall not declare a 10158 // new class or enumeration. 10159 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10160 "Parser allowed 'typedef' as storage class of condition decl."); 10161 10162 Decl *Dcl = ActOnDeclarator(S, D); 10163 if (!Dcl) 10164 return true; 10165 10166 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10167 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10168 << D.getSourceRange(); 10169 return true; 10170 } 10171 10172 return Dcl; 10173} 10174 10175void Sema::LoadExternalVTableUses() { 10176 if (!ExternalSource) 10177 return; 10178 10179 SmallVector<ExternalVTableUse, 4> VTables; 10180 ExternalSource->ReadUsedVTables(VTables); 10181 SmallVector<VTableUse, 4> NewUses; 10182 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10183 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10184 = VTablesUsed.find(VTables[I].Record); 10185 // Even if a definition wasn't required before, it may be required now. 10186 if (Pos != VTablesUsed.end()) { 10187 if (!Pos->second && VTables[I].DefinitionRequired) 10188 Pos->second = true; 10189 continue; 10190 } 10191 10192 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10193 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10194 } 10195 10196 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10197} 10198 10199void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10200 bool DefinitionRequired) { 10201 // Ignore any vtable uses in unevaluated operands or for classes that do 10202 // not have a vtable. 10203 if (!Class->isDynamicClass() || Class->isDependentContext() || 10204 CurContext->isDependentContext() || 10205 ExprEvalContexts.back().Context == Unevaluated) 10206 return; 10207 10208 // Try to insert this class into the map. 10209 LoadExternalVTableUses(); 10210 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10211 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10212 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10213 if (!Pos.second) { 10214 // If we already had an entry, check to see if we are promoting this vtable 10215 // to required a definition. If so, we need to reappend to the VTableUses 10216 // list, since we may have already processed the first entry. 10217 if (DefinitionRequired && !Pos.first->second) { 10218 Pos.first->second = true; 10219 } else { 10220 // Otherwise, we can early exit. 10221 return; 10222 } 10223 } 10224 10225 // Local classes need to have their virtual members marked 10226 // immediately. For all other classes, we mark their virtual members 10227 // at the end of the translation unit. 10228 if (Class->isLocalClass()) 10229 MarkVirtualMembersReferenced(Loc, Class); 10230 else 10231 VTableUses.push_back(std::make_pair(Class, Loc)); 10232} 10233 10234bool Sema::DefineUsedVTables() { 10235 LoadExternalVTableUses(); 10236 if (VTableUses.empty()) 10237 return false; 10238 10239 // Note: The VTableUses vector could grow as a result of marking 10240 // the members of a class as "used", so we check the size each 10241 // time through the loop and prefer indices (with are stable) to 10242 // iterators (which are not). 10243 bool DefinedAnything = false; 10244 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10245 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10246 if (!Class) 10247 continue; 10248 10249 SourceLocation Loc = VTableUses[I].second; 10250 10251 // If this class has a key function, but that key function is 10252 // defined in another translation unit, we don't need to emit the 10253 // vtable even though we're using it. 10254 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10255 if (KeyFunction && !KeyFunction->hasBody()) { 10256 switch (KeyFunction->getTemplateSpecializationKind()) { 10257 case TSK_Undeclared: 10258 case TSK_ExplicitSpecialization: 10259 case TSK_ExplicitInstantiationDeclaration: 10260 // The key function is in another translation unit. 10261 continue; 10262 10263 case TSK_ExplicitInstantiationDefinition: 10264 case TSK_ImplicitInstantiation: 10265 // We will be instantiating the key function. 10266 break; 10267 } 10268 } else if (!KeyFunction) { 10269 // If we have a class with no key function that is the subject 10270 // of an explicit instantiation declaration, suppress the 10271 // vtable; it will live with the explicit instantiation 10272 // definition. 10273 bool IsExplicitInstantiationDeclaration 10274 = Class->getTemplateSpecializationKind() 10275 == TSK_ExplicitInstantiationDeclaration; 10276 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10277 REnd = Class->redecls_end(); 10278 R != REnd; ++R) { 10279 TemplateSpecializationKind TSK 10280 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10281 if (TSK == TSK_ExplicitInstantiationDeclaration) 10282 IsExplicitInstantiationDeclaration = true; 10283 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10284 IsExplicitInstantiationDeclaration = false; 10285 break; 10286 } 10287 } 10288 10289 if (IsExplicitInstantiationDeclaration) 10290 continue; 10291 } 10292 10293 // Mark all of the virtual members of this class as referenced, so 10294 // that we can build a vtable. Then, tell the AST consumer that a 10295 // vtable for this class is required. 10296 DefinedAnything = true; 10297 MarkVirtualMembersReferenced(Loc, Class); 10298 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10299 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10300 10301 // Optionally warn if we're emitting a weak vtable. 10302 if (Class->getLinkage() == ExternalLinkage && 10303 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10304 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 10305 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 10306 } 10307 } 10308 VTableUses.clear(); 10309 10310 return DefinedAnything; 10311} 10312 10313void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10314 const CXXRecordDecl *RD) { 10315 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10316 e = RD->method_end(); i != e; ++i) { 10317 CXXMethodDecl *MD = *i; 10318 10319 // C++ [basic.def.odr]p2: 10320 // [...] A virtual member function is used if it is not pure. [...] 10321 if (MD->isVirtual() && !MD->isPure()) 10322 MarkDeclarationReferenced(Loc, MD); 10323 } 10324 10325 // Only classes that have virtual bases need a VTT. 10326 if (RD->getNumVBases() == 0) 10327 return; 10328 10329 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10330 e = RD->bases_end(); i != e; ++i) { 10331 const CXXRecordDecl *Base = 10332 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10333 if (Base->getNumVBases() == 0) 10334 continue; 10335 MarkVirtualMembersReferenced(Loc, Base); 10336 } 10337} 10338 10339/// SetIvarInitializers - This routine builds initialization ASTs for the 10340/// Objective-C implementation whose ivars need be initialized. 10341void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10342 if (!getLangOptions().CPlusPlus) 10343 return; 10344 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10345 SmallVector<ObjCIvarDecl*, 8> ivars; 10346 CollectIvarsToConstructOrDestruct(OID, ivars); 10347 if (ivars.empty()) 10348 return; 10349 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10350 for (unsigned i = 0; i < ivars.size(); i++) { 10351 FieldDecl *Field = ivars[i]; 10352 if (Field->isInvalidDecl()) 10353 continue; 10354 10355 CXXCtorInitializer *Member; 10356 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10357 InitializationKind InitKind = 10358 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10359 10360 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10361 ExprResult MemberInit = 10362 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10363 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10364 // Note, MemberInit could actually come back empty if no initialization 10365 // is required (e.g., because it would call a trivial default constructor) 10366 if (!MemberInit.get() || MemberInit.isInvalid()) 10367 continue; 10368 10369 Member = 10370 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10371 SourceLocation(), 10372 MemberInit.takeAs<Expr>(), 10373 SourceLocation()); 10374 AllToInit.push_back(Member); 10375 10376 // Be sure that the destructor is accessible and is marked as referenced. 10377 if (const RecordType *RecordTy 10378 = Context.getBaseElementType(Field->getType()) 10379 ->getAs<RecordType>()) { 10380 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10381 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10382 MarkDeclarationReferenced(Field->getLocation(), Destructor); 10383 CheckDestructorAccess(Field->getLocation(), Destructor, 10384 PDiag(diag::err_access_dtor_ivar) 10385 << Context.getBaseElementType(Field->getType())); 10386 } 10387 } 10388 } 10389 ObjCImplementation->setIvarInitializers(Context, 10390 AllToInit.data(), AllToInit.size()); 10391 } 10392} 10393 10394static 10395void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10396 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10397 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10398 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10399 Sema &S) { 10400 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10401 CE = Current.end(); 10402 if (Ctor->isInvalidDecl()) 10403 return; 10404 10405 const FunctionDecl *FNTarget = 0; 10406 CXXConstructorDecl *Target; 10407 10408 // We ignore the result here since if we don't have a body, Target will be 10409 // null below. 10410 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10411 Target 10412= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10413 10414 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10415 // Avoid dereferencing a null pointer here. 10416 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10417 10418 if (!Current.insert(Canonical)) 10419 return; 10420 10421 // We know that beyond here, we aren't chaining into a cycle. 10422 if (!Target || !Target->isDelegatingConstructor() || 10423 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10424 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10425 Valid.insert(*CI); 10426 Current.clear(); 10427 // We've hit a cycle. 10428 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10429 Current.count(TCanonical)) { 10430 // If we haven't diagnosed this cycle yet, do so now. 10431 if (!Invalid.count(TCanonical)) { 10432 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10433 diag::warn_delegating_ctor_cycle) 10434 << Ctor; 10435 10436 // Don't add a note for a function delegating directo to itself. 10437 if (TCanonical != Canonical) 10438 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10439 10440 CXXConstructorDecl *C = Target; 10441 while (C->getCanonicalDecl() != Canonical) { 10442 (void)C->getTargetConstructor()->hasBody(FNTarget); 10443 assert(FNTarget && "Ctor cycle through bodiless function"); 10444 10445 C 10446 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10447 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10448 } 10449 } 10450 10451 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10452 Invalid.insert(*CI); 10453 Current.clear(); 10454 } else { 10455 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10456 } 10457} 10458 10459 10460void Sema::CheckDelegatingCtorCycles() { 10461 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10462 10463 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10464 CE = Current.end(); 10465 10466 for (DelegatingCtorDeclsType::iterator 10467 I = DelegatingCtorDecls.begin(ExternalSource), 10468 E = DelegatingCtorDecls.end(); 10469 I != E; ++I) { 10470 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10471 } 10472 10473 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10474 (*CI)->setInvalidDecl(); 10475} 10476