SemaDeclCXX.cpp revision 4dc41c9b766140b507980a13acccf2f05ed19cd3
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/ASTMutationListener.h" 22#include "clang/AST/CharUnits.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclVisitor.h" 25#include "clang/AST/ExprCXX.h" 26#include "clang/AST/RecordLayout.h" 27#include "clang/AST/StmtVisitor.h" 28#include "clang/AST/TypeLoc.h" 29#include "clang/AST/TypeOrdering.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/ParsedTemplate.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Lex/Preprocessor.h" 34#include "llvm/ADT/DenseSet.h" 35#include "llvm/ADT/STLExtras.h" 36#include <map> 37#include <set> 38 39using namespace clang; 40 41//===----------------------------------------------------------------------===// 42// CheckDefaultArgumentVisitor 43//===----------------------------------------------------------------------===// 44 45namespace { 46 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 47 /// the default argument of a parameter to determine whether it 48 /// contains any ill-formed subexpressions. For example, this will 49 /// diagnose the use of local variables or parameters within the 50 /// default argument expression. 51 class CheckDefaultArgumentVisitor 52 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 53 Expr *DefaultArg; 54 Sema *S; 55 56 public: 57 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 58 : DefaultArg(defarg), S(s) {} 59 60 bool VisitExpr(Expr *Node); 61 bool VisitDeclRefExpr(DeclRefExpr *DRE); 62 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 63 }; 64 65 /// VisitExpr - Visit all of the children of this expression. 66 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 67 bool IsInvalid = false; 68 for (Stmt::child_range I = Node->children(); I; ++I) 69 IsInvalid |= Visit(*I); 70 return IsInvalid; 71 } 72 73 /// VisitDeclRefExpr - Visit a reference to a declaration, to 74 /// determine whether this declaration can be used in the default 75 /// argument expression. 76 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 77 NamedDecl *Decl = DRE->getDecl(); 78 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 79 // C++ [dcl.fct.default]p9 80 // Default arguments are evaluated each time the function is 81 // called. The order of evaluation of function arguments is 82 // unspecified. Consequently, parameters of a function shall not 83 // be used in default argument expressions, even if they are not 84 // evaluated. Parameters of a function declared before a default 85 // argument expression are in scope and can hide namespace and 86 // class member names. 87 return S->Diag(DRE->getSourceRange().getBegin(), 88 diag::err_param_default_argument_references_param) 89 << Param->getDeclName() << DefaultArg->getSourceRange(); 90 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 91 // C++ [dcl.fct.default]p7 92 // Local variables shall not be used in default argument 93 // expressions. 94 if (VDecl->isLocalVarDecl()) 95 return S->Diag(DRE->getSourceRange().getBegin(), 96 diag::err_param_default_argument_references_local) 97 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 98 } 99 100 return false; 101 } 102 103 /// VisitCXXThisExpr - Visit a C++ "this" expression. 104 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 105 // C++ [dcl.fct.default]p8: 106 // The keyword this shall not be used in a default argument of a 107 // member function. 108 return S->Diag(ThisE->getSourceRange().getBegin(), 109 diag::err_param_default_argument_references_this) 110 << ThisE->getSourceRange(); 111 } 112} 113 114void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 115 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 116 // If we have an MSAny or unknown spec already, don't bother. 117 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 118 return; 119 120 const FunctionProtoType *Proto 121 = Method->getType()->getAs<FunctionProtoType>(); 122 123 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 124 125 // If this function can throw any exceptions, make a note of that. 126 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 127 ClearExceptions(); 128 ComputedEST = EST; 129 return; 130 } 131 132 // FIXME: If the call to this decl is using any of its default arguments, we 133 // need to search them for potentially-throwing calls. 134 135 // If this function has a basic noexcept, it doesn't affect the outcome. 136 if (EST == EST_BasicNoexcept) 137 return; 138 139 // If we have a throw-all spec at this point, ignore the function. 140 if (ComputedEST == EST_None) 141 return; 142 143 // If we're still at noexcept(true) and there's a nothrow() callee, 144 // change to that specification. 145 if (EST == EST_DynamicNone) { 146 if (ComputedEST == EST_BasicNoexcept) 147 ComputedEST = EST_DynamicNone; 148 return; 149 } 150 151 // Check out noexcept specs. 152 if (EST == EST_ComputedNoexcept) { 153 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 154 assert(NR != FunctionProtoType::NR_NoNoexcept && 155 "Must have noexcept result for EST_ComputedNoexcept."); 156 assert(NR != FunctionProtoType::NR_Dependent && 157 "Should not generate implicit declarations for dependent cases, " 158 "and don't know how to handle them anyway."); 159 160 // noexcept(false) -> no spec on the new function 161 if (NR == FunctionProtoType::NR_Throw) { 162 ClearExceptions(); 163 ComputedEST = EST_None; 164 } 165 // noexcept(true) won't change anything either. 166 return; 167 } 168 169 assert(EST == EST_Dynamic && "EST case not considered earlier."); 170 assert(ComputedEST != EST_None && 171 "Shouldn't collect exceptions when throw-all is guaranteed."); 172 ComputedEST = EST_Dynamic; 173 // Record the exceptions in this function's exception specification. 174 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 175 EEnd = Proto->exception_end(); 176 E != EEnd; ++E) 177 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 178 Exceptions.push_back(*E); 179} 180 181void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 182 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 183 return; 184 185 // FIXME: 186 // 187 // C++0x [except.spec]p14: 188 // [An] implicit exception-specification specifies the type-id T if and 189 // only if T is allowed by the exception-specification of a function directly 190 // invoked by f's implicit definition; f shall allow all exceptions if any 191 // function it directly invokes allows all exceptions, and f shall allow no 192 // exceptions if every function it directly invokes allows no exceptions. 193 // 194 // Note in particular that if an implicit exception-specification is generated 195 // for a function containing a throw-expression, that specification can still 196 // be noexcept(true). 197 // 198 // Note also that 'directly invoked' is not defined in the standard, and there 199 // is no indication that we should only consider potentially-evaluated calls. 200 // 201 // Ultimately we should implement the intent of the standard: the exception 202 // specification should be the set of exceptions which can be thrown by the 203 // implicit definition. For now, we assume that any non-nothrow expression can 204 // throw any exception. 205 206 if (E->CanThrow(*Context)) 207 ComputedEST = EST_None; 208} 209 210bool 211Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 212 SourceLocation EqualLoc) { 213 if (RequireCompleteType(Param->getLocation(), Param->getType(), 214 diag::err_typecheck_decl_incomplete_type)) { 215 Param->setInvalidDecl(); 216 return true; 217 } 218 219 // C++ [dcl.fct.default]p5 220 // A default argument expression is implicitly converted (clause 221 // 4) to the parameter type. The default argument expression has 222 // the same semantic constraints as the initializer expression in 223 // a declaration of a variable of the parameter type, using the 224 // copy-initialization semantics (8.5). 225 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 226 Param); 227 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 228 EqualLoc); 229 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 230 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 231 MultiExprArg(*this, &Arg, 1)); 232 if (Result.isInvalid()) 233 return true; 234 Arg = Result.takeAs<Expr>(); 235 236 CheckImplicitConversions(Arg, EqualLoc); 237 Arg = MaybeCreateExprWithCleanups(Arg); 238 239 // Okay: add the default argument to the parameter 240 Param->setDefaultArg(Arg); 241 242 // We have already instantiated this parameter; provide each of the 243 // instantiations with the uninstantiated default argument. 244 UnparsedDefaultArgInstantiationsMap::iterator InstPos 245 = UnparsedDefaultArgInstantiations.find(Param); 246 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 247 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 248 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 249 250 // We're done tracking this parameter's instantiations. 251 UnparsedDefaultArgInstantiations.erase(InstPos); 252 } 253 254 return false; 255} 256 257/// ActOnParamDefaultArgument - Check whether the default argument 258/// provided for a function parameter is well-formed. If so, attach it 259/// to the parameter declaration. 260void 261Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 262 Expr *DefaultArg) { 263 if (!param || !DefaultArg) 264 return; 265 266 ParmVarDecl *Param = cast<ParmVarDecl>(param); 267 UnparsedDefaultArgLocs.erase(Param); 268 269 // Default arguments are only permitted in C++ 270 if (!getLangOptions().CPlusPlus) { 271 Diag(EqualLoc, diag::err_param_default_argument) 272 << DefaultArg->getSourceRange(); 273 Param->setInvalidDecl(); 274 return; 275 } 276 277 // Check for unexpanded parameter packs. 278 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 279 Param->setInvalidDecl(); 280 return; 281 } 282 283 // Check that the default argument is well-formed 284 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 285 if (DefaultArgChecker.Visit(DefaultArg)) { 286 Param->setInvalidDecl(); 287 return; 288 } 289 290 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 291} 292 293/// ActOnParamUnparsedDefaultArgument - We've seen a default 294/// argument for a function parameter, but we can't parse it yet 295/// because we're inside a class definition. Note that this default 296/// argument will be parsed later. 297void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 298 SourceLocation EqualLoc, 299 SourceLocation ArgLoc) { 300 if (!param) 301 return; 302 303 ParmVarDecl *Param = cast<ParmVarDecl>(param); 304 if (Param) 305 Param->setUnparsedDefaultArg(); 306 307 UnparsedDefaultArgLocs[Param] = ArgLoc; 308} 309 310/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 311/// the default argument for the parameter param failed. 312void Sema::ActOnParamDefaultArgumentError(Decl *param) { 313 if (!param) 314 return; 315 316 ParmVarDecl *Param = cast<ParmVarDecl>(param); 317 318 Param->setInvalidDecl(); 319 320 UnparsedDefaultArgLocs.erase(Param); 321} 322 323/// CheckExtraCXXDefaultArguments - Check for any extra default 324/// arguments in the declarator, which is not a function declaration 325/// or definition and therefore is not permitted to have default 326/// arguments. This routine should be invoked for every declarator 327/// that is not a function declaration or definition. 328void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 329 // C++ [dcl.fct.default]p3 330 // A default argument expression shall be specified only in the 331 // parameter-declaration-clause of a function declaration or in a 332 // template-parameter (14.1). It shall not be specified for a 333 // parameter pack. If it is specified in a 334 // parameter-declaration-clause, it shall not occur within a 335 // declarator or abstract-declarator of a parameter-declaration. 336 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 337 DeclaratorChunk &chunk = D.getTypeObject(i); 338 if (chunk.Kind == DeclaratorChunk::Function) { 339 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 340 ParmVarDecl *Param = 341 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 342 if (Param->hasUnparsedDefaultArg()) { 343 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 344 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 345 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 346 delete Toks; 347 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 348 } else if (Param->getDefaultArg()) { 349 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 350 << Param->getDefaultArg()->getSourceRange(); 351 Param->setDefaultArg(0); 352 } 353 } 354 } 355 } 356} 357 358// MergeCXXFunctionDecl - Merge two declarations of the same C++ 359// function, once we already know that they have the same 360// type. Subroutine of MergeFunctionDecl. Returns true if there was an 361// error, false otherwise. 362bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 363 bool Invalid = false; 364 365 // C++ [dcl.fct.default]p4: 366 // For non-template functions, default arguments can be added in 367 // later declarations of a function in the same 368 // scope. Declarations in different scopes have completely 369 // distinct sets of default arguments. That is, declarations in 370 // inner scopes do not acquire default arguments from 371 // declarations in outer scopes, and vice versa. In a given 372 // function declaration, all parameters subsequent to a 373 // parameter with a default argument shall have default 374 // arguments supplied in this or previous declarations. A 375 // default argument shall not be redefined by a later 376 // declaration (not even to the same value). 377 // 378 // C++ [dcl.fct.default]p6: 379 // Except for member functions of class templates, the default arguments 380 // in a member function definition that appears outside of the class 381 // definition are added to the set of default arguments provided by the 382 // member function declaration in the class definition. 383 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 384 ParmVarDecl *OldParam = Old->getParamDecl(p); 385 ParmVarDecl *NewParam = New->getParamDecl(p); 386 387 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 388 389 unsigned DiagDefaultParamID = 390 diag::err_param_default_argument_redefinition; 391 392 // MSVC accepts that default parameters be redefined for member functions 393 // of template class. The new default parameter's value is ignored. 394 Invalid = true; 395 if (getLangOptions().Microsoft) { 396 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 397 if (MD && MD->getParent()->getDescribedClassTemplate()) { 398 // Merge the old default argument into the new parameter. 399 NewParam->setHasInheritedDefaultArg(); 400 if (OldParam->hasUninstantiatedDefaultArg()) 401 NewParam->setUninstantiatedDefaultArg( 402 OldParam->getUninstantiatedDefaultArg()); 403 else 404 NewParam->setDefaultArg(OldParam->getInit()); 405 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 406 Invalid = false; 407 } 408 } 409 410 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 411 // hint here. Alternatively, we could walk the type-source information 412 // for NewParam to find the last source location in the type... but it 413 // isn't worth the effort right now. This is the kind of test case that 414 // is hard to get right: 415 // int f(int); 416 // void g(int (*fp)(int) = f); 417 // void g(int (*fp)(int) = &f); 418 Diag(NewParam->getLocation(), DiagDefaultParamID) 419 << NewParam->getDefaultArgRange(); 420 421 // Look for the function declaration where the default argument was 422 // actually written, which may be a declaration prior to Old. 423 for (FunctionDecl *Older = Old->getPreviousDeclaration(); 424 Older; Older = Older->getPreviousDeclaration()) { 425 if (!Older->getParamDecl(p)->hasDefaultArg()) 426 break; 427 428 OldParam = Older->getParamDecl(p); 429 } 430 431 Diag(OldParam->getLocation(), diag::note_previous_definition) 432 << OldParam->getDefaultArgRange(); 433 } else if (OldParam->hasDefaultArg()) { 434 // Merge the old default argument into the new parameter. 435 // It's important to use getInit() here; getDefaultArg() 436 // strips off any top-level ExprWithCleanups. 437 NewParam->setHasInheritedDefaultArg(); 438 if (OldParam->hasUninstantiatedDefaultArg()) 439 NewParam->setUninstantiatedDefaultArg( 440 OldParam->getUninstantiatedDefaultArg()); 441 else 442 NewParam->setDefaultArg(OldParam->getInit()); 443 } else if (NewParam->hasDefaultArg()) { 444 if (New->getDescribedFunctionTemplate()) { 445 // Paragraph 4, quoted above, only applies to non-template functions. 446 Diag(NewParam->getLocation(), 447 diag::err_param_default_argument_template_redecl) 448 << NewParam->getDefaultArgRange(); 449 Diag(Old->getLocation(), diag::note_template_prev_declaration) 450 << false; 451 } else if (New->getTemplateSpecializationKind() 452 != TSK_ImplicitInstantiation && 453 New->getTemplateSpecializationKind() != TSK_Undeclared) { 454 // C++ [temp.expr.spec]p21: 455 // Default function arguments shall not be specified in a declaration 456 // or a definition for one of the following explicit specializations: 457 // - the explicit specialization of a function template; 458 // - the explicit specialization of a member function template; 459 // - the explicit specialization of a member function of a class 460 // template where the class template specialization to which the 461 // member function specialization belongs is implicitly 462 // instantiated. 463 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 464 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 465 << New->getDeclName() 466 << NewParam->getDefaultArgRange(); 467 } else if (New->getDeclContext()->isDependentContext()) { 468 // C++ [dcl.fct.default]p6 (DR217): 469 // Default arguments for a member function of a class template shall 470 // be specified on the initial declaration of the member function 471 // within the class template. 472 // 473 // Reading the tea leaves a bit in DR217 and its reference to DR205 474 // leads me to the conclusion that one cannot add default function 475 // arguments for an out-of-line definition of a member function of a 476 // dependent type. 477 int WhichKind = 2; 478 if (CXXRecordDecl *Record 479 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 480 if (Record->getDescribedClassTemplate()) 481 WhichKind = 0; 482 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 483 WhichKind = 1; 484 else 485 WhichKind = 2; 486 } 487 488 Diag(NewParam->getLocation(), 489 diag::err_param_default_argument_member_template_redecl) 490 << WhichKind 491 << NewParam->getDefaultArgRange(); 492 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 493 CXXSpecialMember NewSM = getSpecialMember(Ctor), 494 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 495 if (NewSM != OldSM) { 496 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 497 << NewParam->getDefaultArgRange() << NewSM; 498 Diag(Old->getLocation(), diag::note_previous_declaration_special) 499 << OldSM; 500 } 501 } 502 } 503 } 504 505 if (CheckEquivalentExceptionSpec(Old, New)) 506 Invalid = true; 507 508 return Invalid; 509} 510 511/// \brief Merge the exception specifications of two variable declarations. 512/// 513/// This is called when there's a redeclaration of a VarDecl. The function 514/// checks if the redeclaration might have an exception specification and 515/// validates compatibility and merges the specs if necessary. 516void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 517 // Shortcut if exceptions are disabled. 518 if (!getLangOptions().CXXExceptions) 519 return; 520 521 assert(Context.hasSameType(New->getType(), Old->getType()) && 522 "Should only be called if types are otherwise the same."); 523 524 QualType NewType = New->getType(); 525 QualType OldType = Old->getType(); 526 527 // We're only interested in pointers and references to functions, as well 528 // as pointers to member functions. 529 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 530 NewType = R->getPointeeType(); 531 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 532 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 533 NewType = P->getPointeeType(); 534 OldType = OldType->getAs<PointerType>()->getPointeeType(); 535 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 536 NewType = M->getPointeeType(); 537 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 538 } 539 540 if (!NewType->isFunctionProtoType()) 541 return; 542 543 // There's lots of special cases for functions. For function pointers, system 544 // libraries are hopefully not as broken so that we don't need these 545 // workarounds. 546 if (CheckEquivalentExceptionSpec( 547 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 548 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 549 New->setInvalidDecl(); 550 } 551} 552 553/// CheckCXXDefaultArguments - Verify that the default arguments for a 554/// function declaration are well-formed according to C++ 555/// [dcl.fct.default]. 556void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 557 unsigned NumParams = FD->getNumParams(); 558 unsigned p; 559 560 // Find first parameter with a default argument 561 for (p = 0; p < NumParams; ++p) { 562 ParmVarDecl *Param = FD->getParamDecl(p); 563 if (Param->hasDefaultArg()) 564 break; 565 } 566 567 // C++ [dcl.fct.default]p4: 568 // In a given function declaration, all parameters 569 // subsequent to a parameter with a default argument shall 570 // have default arguments supplied in this or previous 571 // declarations. A default argument shall not be redefined 572 // by a later declaration (not even to the same value). 573 unsigned LastMissingDefaultArg = 0; 574 for (; p < NumParams; ++p) { 575 ParmVarDecl *Param = FD->getParamDecl(p); 576 if (!Param->hasDefaultArg()) { 577 if (Param->isInvalidDecl()) 578 /* We already complained about this parameter. */; 579 else if (Param->getIdentifier()) 580 Diag(Param->getLocation(), 581 diag::err_param_default_argument_missing_name) 582 << Param->getIdentifier(); 583 else 584 Diag(Param->getLocation(), 585 diag::err_param_default_argument_missing); 586 587 LastMissingDefaultArg = p; 588 } 589 } 590 591 if (LastMissingDefaultArg > 0) { 592 // Some default arguments were missing. Clear out all of the 593 // default arguments up to (and including) the last missing 594 // default argument, so that we leave the function parameters 595 // in a semantically valid state. 596 for (p = 0; p <= LastMissingDefaultArg; ++p) { 597 ParmVarDecl *Param = FD->getParamDecl(p); 598 if (Param->hasDefaultArg()) { 599 Param->setDefaultArg(0); 600 } 601 } 602 } 603} 604 605/// isCurrentClassName - Determine whether the identifier II is the 606/// name of the class type currently being defined. In the case of 607/// nested classes, this will only return true if II is the name of 608/// the innermost class. 609bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 610 const CXXScopeSpec *SS) { 611 assert(getLangOptions().CPlusPlus && "No class names in C!"); 612 613 CXXRecordDecl *CurDecl; 614 if (SS && SS->isSet() && !SS->isInvalid()) { 615 DeclContext *DC = computeDeclContext(*SS, true); 616 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 617 } else 618 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 619 620 if (CurDecl && CurDecl->getIdentifier()) 621 return &II == CurDecl->getIdentifier(); 622 else 623 return false; 624} 625 626/// \brief Check the validity of a C++ base class specifier. 627/// 628/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 629/// and returns NULL otherwise. 630CXXBaseSpecifier * 631Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 632 SourceRange SpecifierRange, 633 bool Virtual, AccessSpecifier Access, 634 TypeSourceInfo *TInfo, 635 SourceLocation EllipsisLoc) { 636 QualType BaseType = TInfo->getType(); 637 638 // C++ [class.union]p1: 639 // A union shall not have base classes. 640 if (Class->isUnion()) { 641 Diag(Class->getLocation(), diag::err_base_clause_on_union) 642 << SpecifierRange; 643 return 0; 644 } 645 646 if (EllipsisLoc.isValid() && 647 !TInfo->getType()->containsUnexpandedParameterPack()) { 648 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 649 << TInfo->getTypeLoc().getSourceRange(); 650 EllipsisLoc = SourceLocation(); 651 } 652 653 if (BaseType->isDependentType()) 654 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 655 Class->getTagKind() == TTK_Class, 656 Access, TInfo, EllipsisLoc); 657 658 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 659 660 // Base specifiers must be record types. 661 if (!BaseType->isRecordType()) { 662 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 663 return 0; 664 } 665 666 // C++ [class.union]p1: 667 // A union shall not be used as a base class. 668 if (BaseType->isUnionType()) { 669 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 670 return 0; 671 } 672 673 // C++ [class.derived]p2: 674 // The class-name in a base-specifier shall not be an incompletely 675 // defined class. 676 if (RequireCompleteType(BaseLoc, BaseType, 677 PDiag(diag::err_incomplete_base_class) 678 << SpecifierRange)) { 679 Class->setInvalidDecl(); 680 return 0; 681 } 682 683 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 684 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 685 assert(BaseDecl && "Record type has no declaration"); 686 BaseDecl = BaseDecl->getDefinition(); 687 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 688 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 689 assert(CXXBaseDecl && "Base type is not a C++ type"); 690 691 // C++ [class]p3: 692 // If a class is marked final and it appears as a base-type-specifier in 693 // base-clause, the program is ill-formed. 694 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 695 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 696 << CXXBaseDecl->getDeclName(); 697 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 698 << CXXBaseDecl->getDeclName(); 699 return 0; 700 } 701 702 if (BaseDecl->isInvalidDecl()) 703 Class->setInvalidDecl(); 704 705 // Create the base specifier. 706 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 707 Class->getTagKind() == TTK_Class, 708 Access, TInfo, EllipsisLoc); 709} 710 711/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 712/// one entry in the base class list of a class specifier, for 713/// example: 714/// class foo : public bar, virtual private baz { 715/// 'public bar' and 'virtual private baz' are each base-specifiers. 716BaseResult 717Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 718 bool Virtual, AccessSpecifier Access, 719 ParsedType basetype, SourceLocation BaseLoc, 720 SourceLocation EllipsisLoc) { 721 if (!classdecl) 722 return true; 723 724 AdjustDeclIfTemplate(classdecl); 725 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 726 if (!Class) 727 return true; 728 729 TypeSourceInfo *TInfo = 0; 730 GetTypeFromParser(basetype, &TInfo); 731 732 if (EllipsisLoc.isInvalid() && 733 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 734 UPPC_BaseType)) 735 return true; 736 737 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 738 Virtual, Access, TInfo, 739 EllipsisLoc)) 740 return BaseSpec; 741 742 return true; 743} 744 745/// \brief Performs the actual work of attaching the given base class 746/// specifiers to a C++ class. 747bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 748 unsigned NumBases) { 749 if (NumBases == 0) 750 return false; 751 752 // Used to keep track of which base types we have already seen, so 753 // that we can properly diagnose redundant direct base types. Note 754 // that the key is always the unqualified canonical type of the base 755 // class. 756 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 757 758 // Copy non-redundant base specifiers into permanent storage. 759 unsigned NumGoodBases = 0; 760 bool Invalid = false; 761 for (unsigned idx = 0; idx < NumBases; ++idx) { 762 QualType NewBaseType 763 = Context.getCanonicalType(Bases[idx]->getType()); 764 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 765 if (KnownBaseTypes[NewBaseType]) { 766 // C++ [class.mi]p3: 767 // A class shall not be specified as a direct base class of a 768 // derived class more than once. 769 Diag(Bases[idx]->getSourceRange().getBegin(), 770 diag::err_duplicate_base_class) 771 << KnownBaseTypes[NewBaseType]->getType() 772 << Bases[idx]->getSourceRange(); 773 774 // Delete the duplicate base class specifier; we're going to 775 // overwrite its pointer later. 776 Context.Deallocate(Bases[idx]); 777 778 Invalid = true; 779 } else { 780 // Okay, add this new base class. 781 KnownBaseTypes[NewBaseType] = Bases[idx]; 782 Bases[NumGoodBases++] = Bases[idx]; 783 } 784 } 785 786 // Attach the remaining base class specifiers to the derived class. 787 Class->setBases(Bases, NumGoodBases); 788 789 // Delete the remaining (good) base class specifiers, since their 790 // data has been copied into the CXXRecordDecl. 791 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 792 Context.Deallocate(Bases[idx]); 793 794 return Invalid; 795} 796 797/// ActOnBaseSpecifiers - Attach the given base specifiers to the 798/// class, after checking whether there are any duplicate base 799/// classes. 800void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, BaseTy **Bases, 801 unsigned NumBases) { 802 if (!ClassDecl || !Bases || !NumBases) 803 return; 804 805 AdjustDeclIfTemplate(ClassDecl); 806 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 807 (CXXBaseSpecifier**)(Bases), NumBases); 808} 809 810static CXXRecordDecl *GetClassForType(QualType T) { 811 if (const RecordType *RT = T->getAs<RecordType>()) 812 return cast<CXXRecordDecl>(RT->getDecl()); 813 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 814 return ICT->getDecl(); 815 else 816 return 0; 817} 818 819/// \brief Determine whether the type \p Derived is a C++ class that is 820/// derived from the type \p Base. 821bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 822 if (!getLangOptions().CPlusPlus) 823 return false; 824 825 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 826 if (!DerivedRD) 827 return false; 828 829 CXXRecordDecl *BaseRD = GetClassForType(Base); 830 if (!BaseRD) 831 return false; 832 833 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 834 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 835} 836 837/// \brief Determine whether the type \p Derived is a C++ class that is 838/// derived from the type \p Base. 839bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 840 if (!getLangOptions().CPlusPlus) 841 return false; 842 843 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 844 if (!DerivedRD) 845 return false; 846 847 CXXRecordDecl *BaseRD = GetClassForType(Base); 848 if (!BaseRD) 849 return false; 850 851 return DerivedRD->isDerivedFrom(BaseRD, Paths); 852} 853 854void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 855 CXXCastPath &BasePathArray) { 856 assert(BasePathArray.empty() && "Base path array must be empty!"); 857 assert(Paths.isRecordingPaths() && "Must record paths!"); 858 859 const CXXBasePath &Path = Paths.front(); 860 861 // We first go backward and check if we have a virtual base. 862 // FIXME: It would be better if CXXBasePath had the base specifier for 863 // the nearest virtual base. 864 unsigned Start = 0; 865 for (unsigned I = Path.size(); I != 0; --I) { 866 if (Path[I - 1].Base->isVirtual()) { 867 Start = I - 1; 868 break; 869 } 870 } 871 872 // Now add all bases. 873 for (unsigned I = Start, E = Path.size(); I != E; ++I) 874 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 875} 876 877/// \brief Determine whether the given base path includes a virtual 878/// base class. 879bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 880 for (CXXCastPath::const_iterator B = BasePath.begin(), 881 BEnd = BasePath.end(); 882 B != BEnd; ++B) 883 if ((*B)->isVirtual()) 884 return true; 885 886 return false; 887} 888 889/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 890/// conversion (where Derived and Base are class types) is 891/// well-formed, meaning that the conversion is unambiguous (and 892/// that all of the base classes are accessible). Returns true 893/// and emits a diagnostic if the code is ill-formed, returns false 894/// otherwise. Loc is the location where this routine should point to 895/// if there is an error, and Range is the source range to highlight 896/// if there is an error. 897bool 898Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 899 unsigned InaccessibleBaseID, 900 unsigned AmbigiousBaseConvID, 901 SourceLocation Loc, SourceRange Range, 902 DeclarationName Name, 903 CXXCastPath *BasePath) { 904 // First, determine whether the path from Derived to Base is 905 // ambiguous. This is slightly more expensive than checking whether 906 // the Derived to Base conversion exists, because here we need to 907 // explore multiple paths to determine if there is an ambiguity. 908 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 909 /*DetectVirtual=*/false); 910 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 911 assert(DerivationOkay && 912 "Can only be used with a derived-to-base conversion"); 913 (void)DerivationOkay; 914 915 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 916 if (InaccessibleBaseID) { 917 // Check that the base class can be accessed. 918 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 919 InaccessibleBaseID)) { 920 case AR_inaccessible: 921 return true; 922 case AR_accessible: 923 case AR_dependent: 924 case AR_delayed: 925 break; 926 } 927 } 928 929 // Build a base path if necessary. 930 if (BasePath) 931 BuildBasePathArray(Paths, *BasePath); 932 return false; 933 } 934 935 // We know that the derived-to-base conversion is ambiguous, and 936 // we're going to produce a diagnostic. Perform the derived-to-base 937 // search just one more time to compute all of the possible paths so 938 // that we can print them out. This is more expensive than any of 939 // the previous derived-to-base checks we've done, but at this point 940 // performance isn't as much of an issue. 941 Paths.clear(); 942 Paths.setRecordingPaths(true); 943 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 944 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 945 (void)StillOkay; 946 947 // Build up a textual representation of the ambiguous paths, e.g., 948 // D -> B -> A, that will be used to illustrate the ambiguous 949 // conversions in the diagnostic. We only print one of the paths 950 // to each base class subobject. 951 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 952 953 Diag(Loc, AmbigiousBaseConvID) 954 << Derived << Base << PathDisplayStr << Range << Name; 955 return true; 956} 957 958bool 959Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 960 SourceLocation Loc, SourceRange Range, 961 CXXCastPath *BasePath, 962 bool IgnoreAccess) { 963 return CheckDerivedToBaseConversion(Derived, Base, 964 IgnoreAccess ? 0 965 : diag::err_upcast_to_inaccessible_base, 966 diag::err_ambiguous_derived_to_base_conv, 967 Loc, Range, DeclarationName(), 968 BasePath); 969} 970 971 972/// @brief Builds a string representing ambiguous paths from a 973/// specific derived class to different subobjects of the same base 974/// class. 975/// 976/// This function builds a string that can be used in error messages 977/// to show the different paths that one can take through the 978/// inheritance hierarchy to go from the derived class to different 979/// subobjects of a base class. The result looks something like this: 980/// @code 981/// struct D -> struct B -> struct A 982/// struct D -> struct C -> struct A 983/// @endcode 984std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 985 std::string PathDisplayStr; 986 std::set<unsigned> DisplayedPaths; 987 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 988 Path != Paths.end(); ++Path) { 989 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 990 // We haven't displayed a path to this particular base 991 // class subobject yet. 992 PathDisplayStr += "\n "; 993 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 994 for (CXXBasePath::const_iterator Element = Path->begin(); 995 Element != Path->end(); ++Element) 996 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 997 } 998 } 999 1000 return PathDisplayStr; 1001} 1002 1003//===----------------------------------------------------------------------===// 1004// C++ class member Handling 1005//===----------------------------------------------------------------------===// 1006 1007/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1008Decl *Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1009 SourceLocation ASLoc, 1010 SourceLocation ColonLoc) { 1011 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1012 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1013 ASLoc, ColonLoc); 1014 CurContext->addHiddenDecl(ASDecl); 1015 return ASDecl; 1016} 1017 1018/// CheckOverrideControl - Check C++0x override control semantics. 1019void Sema::CheckOverrideControl(const Decl *D) { 1020 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1021 if (!MD || !MD->isVirtual()) 1022 return; 1023 1024 if (MD->isDependentContext()) 1025 return; 1026 1027 // C++0x [class.virtual]p3: 1028 // If a virtual function is marked with the virt-specifier override and does 1029 // not override a member function of a base class, 1030 // the program is ill-formed. 1031 bool HasOverriddenMethods = 1032 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1033 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1034 Diag(MD->getLocation(), 1035 diag::err_function_marked_override_not_overriding) 1036 << MD->getDeclName(); 1037 return; 1038 } 1039} 1040 1041/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1042/// function overrides a virtual member function marked 'final', according to 1043/// C++0x [class.virtual]p3. 1044bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1045 const CXXMethodDecl *Old) { 1046 if (!Old->hasAttr<FinalAttr>()) 1047 return false; 1048 1049 Diag(New->getLocation(), diag::err_final_function_overridden) 1050 << New->getDeclName(); 1051 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1052 return true; 1053} 1054 1055/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1056/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1057/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1058/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1059/// present but parsing it has been deferred. 1060Decl * 1061Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1062 MultiTemplateParamsArg TemplateParameterLists, 1063 ExprTy *BW, const VirtSpecifiers &VS, 1064 ExprTy *InitExpr, bool HasDeferredInit, 1065 bool IsDefinition) { 1066 const DeclSpec &DS = D.getDeclSpec(); 1067 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1068 DeclarationName Name = NameInfo.getName(); 1069 SourceLocation Loc = NameInfo.getLoc(); 1070 1071 // For anonymous bitfields, the location should point to the type. 1072 if (Loc.isInvalid()) 1073 Loc = D.getSourceRange().getBegin(); 1074 1075 Expr *BitWidth = static_cast<Expr*>(BW); 1076 Expr *Init = static_cast<Expr*>(InitExpr); 1077 1078 assert(isa<CXXRecordDecl>(CurContext)); 1079 assert(!DS.isFriendSpecified()); 1080 assert(!Init || !HasDeferredInit); 1081 1082 bool isFunc = 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 if (SS.isSet() && !SS.isInvalid()) { 1125 // The user provided a superfluous scope specifier inside a class 1126 // definition: 1127 // 1128 // class X { 1129 // int X::member; 1130 // }; 1131 DeclContext *DC = 0; 1132 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1133 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1134 << Name << FixItHint::CreateRemoval(SS.getRange()); 1135 else 1136 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1137 << Name << SS.getRange(); 1138 1139 SS.clear(); 1140 } 1141 1142 // FIXME: Check for template parameters! 1143 // FIXME: Check that the name is an identifier! 1144 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1145 HasDeferredInit, AS); 1146 assert(Member && "HandleField never returns null"); 1147 } else { 1148 assert(!HasDeferredInit); 1149 1150 Member = HandleDeclarator(S, D, move(TemplateParameterLists), IsDefinition); 1151 if (!Member) { 1152 return 0; 1153 } 1154 1155 // Non-instance-fields can't have a bitfield. 1156 if (BitWidth) { 1157 if (Member->isInvalidDecl()) { 1158 // don't emit another diagnostic. 1159 } else if (isa<VarDecl>(Member)) { 1160 // C++ 9.6p3: A bit-field shall not be a static member. 1161 // "static member 'A' cannot be a bit-field" 1162 Diag(Loc, diag::err_static_not_bitfield) 1163 << Name << BitWidth->getSourceRange(); 1164 } else if (isa<TypedefDecl>(Member)) { 1165 // "typedef member 'x' cannot be a bit-field" 1166 Diag(Loc, diag::err_typedef_not_bitfield) 1167 << Name << BitWidth->getSourceRange(); 1168 } else { 1169 // A function typedef ("typedef int f(); f a;"). 1170 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1171 Diag(Loc, diag::err_not_integral_type_bitfield) 1172 << Name << cast<ValueDecl>(Member)->getType() 1173 << BitWidth->getSourceRange(); 1174 } 1175 1176 BitWidth = 0; 1177 Member->setInvalidDecl(); 1178 } 1179 1180 Member->setAccess(AS); 1181 1182 // If we have declared a member function template, set the access of the 1183 // templated declaration as well. 1184 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1185 FunTmpl->getTemplatedDecl()->setAccess(AS); 1186 } 1187 1188 if (VS.isOverrideSpecified()) { 1189 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1190 if (!MD || !MD->isVirtual()) { 1191 Diag(Member->getLocStart(), 1192 diag::override_keyword_only_allowed_on_virtual_member_functions) 1193 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1194 } else 1195 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1196 } 1197 if (VS.isFinalSpecified()) { 1198 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1199 if (!MD || !MD->isVirtual()) { 1200 Diag(Member->getLocStart(), 1201 diag::override_keyword_only_allowed_on_virtual_member_functions) 1202 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1203 } else 1204 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1205 } 1206 1207 if (VS.getLastLocation().isValid()) { 1208 // Update the end location of a method that has a virt-specifiers. 1209 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1210 MD->setRangeEnd(VS.getLastLocation()); 1211 } 1212 1213 CheckOverrideControl(Member); 1214 1215 assert((Name || isInstField) && "No identifier for non-field ?"); 1216 1217 if (Init) 1218 AddInitializerToDecl(Member, Init, false, 1219 DS.getTypeSpecType() == DeclSpec::TST_auto); 1220 else if (DS.getTypeSpecType() == DeclSpec::TST_auto && 1221 DS.getStorageClassSpec() == DeclSpec::SCS_static) { 1222 // C++0x [dcl.spec.auto]p4: 'auto' can only be used in the type of a static 1223 // data member if a brace-or-equal-initializer is provided. 1224 Diag(Loc, diag::err_auto_var_requires_init) 1225 << Name << cast<ValueDecl>(Member)->getType(); 1226 Member->setInvalidDecl(); 1227 } 1228 1229 FinalizeDeclaration(Member); 1230 1231 if (isInstField) 1232 FieldCollector->Add(cast<FieldDecl>(Member)); 1233 return Member; 1234} 1235 1236/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1237/// in-class initializer for a non-static C++ class member, and after 1238/// instantiating an in-class initializer in a class template. Such actions 1239/// are deferred until the class is complete. 1240void 1241Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1242 Expr *InitExpr) { 1243 FieldDecl *FD = cast<FieldDecl>(D); 1244 1245 if (!InitExpr) { 1246 FD->setInvalidDecl(); 1247 FD->removeInClassInitializer(); 1248 return; 1249 } 1250 1251 ExprResult Init = InitExpr; 1252 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1253 // FIXME: if there is no EqualLoc, this is list-initialization. 1254 Init = PerformCopyInitialization( 1255 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1256 if (Init.isInvalid()) { 1257 FD->setInvalidDecl(); 1258 return; 1259 } 1260 1261 CheckImplicitConversions(Init.get(), EqualLoc); 1262 } 1263 1264 // C++0x [class.base.init]p7: 1265 // The initialization of each base and member constitutes a 1266 // full-expression. 1267 Init = MaybeCreateExprWithCleanups(Init); 1268 if (Init.isInvalid()) { 1269 FD->setInvalidDecl(); 1270 return; 1271 } 1272 1273 InitExpr = Init.release(); 1274 1275 FD->setInClassInitializer(InitExpr); 1276} 1277 1278/// \brief Find the direct and/or virtual base specifiers that 1279/// correspond to the given base type, for use in base initialization 1280/// within a constructor. 1281static bool FindBaseInitializer(Sema &SemaRef, 1282 CXXRecordDecl *ClassDecl, 1283 QualType BaseType, 1284 const CXXBaseSpecifier *&DirectBaseSpec, 1285 const CXXBaseSpecifier *&VirtualBaseSpec) { 1286 // First, check for a direct base class. 1287 DirectBaseSpec = 0; 1288 for (CXXRecordDecl::base_class_const_iterator Base 1289 = ClassDecl->bases_begin(); 1290 Base != ClassDecl->bases_end(); ++Base) { 1291 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1292 // We found a direct base of this type. That's what we're 1293 // initializing. 1294 DirectBaseSpec = &*Base; 1295 break; 1296 } 1297 } 1298 1299 // Check for a virtual base class. 1300 // FIXME: We might be able to short-circuit this if we know in advance that 1301 // there are no virtual bases. 1302 VirtualBaseSpec = 0; 1303 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1304 // We haven't found a base yet; search the class hierarchy for a 1305 // virtual base class. 1306 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1307 /*DetectVirtual=*/false); 1308 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1309 BaseType, Paths)) { 1310 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1311 Path != Paths.end(); ++Path) { 1312 if (Path->back().Base->isVirtual()) { 1313 VirtualBaseSpec = Path->back().Base; 1314 break; 1315 } 1316 } 1317 } 1318 } 1319 1320 return DirectBaseSpec || VirtualBaseSpec; 1321} 1322 1323/// ActOnMemInitializer - Handle a C++ member initializer. 1324MemInitResult 1325Sema::ActOnMemInitializer(Decl *ConstructorD, 1326 Scope *S, 1327 CXXScopeSpec &SS, 1328 IdentifierInfo *MemberOrBase, 1329 ParsedType TemplateTypeTy, 1330 SourceLocation IdLoc, 1331 SourceLocation LParenLoc, 1332 ExprTy **Args, unsigned NumArgs, 1333 SourceLocation RParenLoc, 1334 SourceLocation EllipsisLoc) { 1335 if (!ConstructorD) 1336 return true; 1337 1338 AdjustDeclIfTemplate(ConstructorD); 1339 1340 CXXConstructorDecl *Constructor 1341 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1342 if (!Constructor) { 1343 // The user wrote a constructor initializer on a function that is 1344 // not a C++ constructor. Ignore the error for now, because we may 1345 // have more member initializers coming; we'll diagnose it just 1346 // once in ActOnMemInitializers. 1347 return true; 1348 } 1349 1350 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1351 1352 // C++ [class.base.init]p2: 1353 // Names in a mem-initializer-id are looked up in the scope of the 1354 // constructor's class and, if not found in that scope, are looked 1355 // up in the scope containing the constructor's definition. 1356 // [Note: if the constructor's class contains a member with the 1357 // same name as a direct or virtual base class of the class, a 1358 // mem-initializer-id naming the member or base class and composed 1359 // of a single identifier refers to the class member. A 1360 // mem-initializer-id for the hidden base class may be specified 1361 // using a qualified name. ] 1362 if (!SS.getScopeRep() && !TemplateTypeTy) { 1363 // Look for a member, first. 1364 FieldDecl *Member = 0; 1365 DeclContext::lookup_result Result 1366 = ClassDecl->lookup(MemberOrBase); 1367 if (Result.first != Result.second) { 1368 Member = dyn_cast<FieldDecl>(*Result.first); 1369 1370 if (Member) { 1371 if (EllipsisLoc.isValid()) 1372 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1373 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1374 1375 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1376 LParenLoc, RParenLoc); 1377 } 1378 1379 // Handle anonymous union case. 1380 if (IndirectFieldDecl* IndirectField 1381 = dyn_cast<IndirectFieldDecl>(*Result.first)) { 1382 if (EllipsisLoc.isValid()) 1383 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1384 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1385 1386 return BuildMemberInitializer(IndirectField, (Expr**)Args, 1387 NumArgs, IdLoc, 1388 LParenLoc, RParenLoc); 1389 } 1390 } 1391 } 1392 // It didn't name a member, so see if it names a class. 1393 QualType BaseType; 1394 TypeSourceInfo *TInfo = 0; 1395 1396 if (TemplateTypeTy) { 1397 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1398 } else { 1399 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1400 LookupParsedName(R, S, &SS); 1401 1402 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1403 if (!TyD) { 1404 if (R.isAmbiguous()) return true; 1405 1406 // We don't want access-control diagnostics here. 1407 R.suppressDiagnostics(); 1408 1409 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1410 bool NotUnknownSpecialization = false; 1411 DeclContext *DC = computeDeclContext(SS, false); 1412 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1413 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1414 1415 if (!NotUnknownSpecialization) { 1416 // When the scope specifier can refer to a member of an unknown 1417 // specialization, we take it as a type name. 1418 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1419 SS.getWithLocInContext(Context), 1420 *MemberOrBase, IdLoc); 1421 if (BaseType.isNull()) 1422 return true; 1423 1424 R.clear(); 1425 R.setLookupName(MemberOrBase); 1426 } 1427 } 1428 1429 // If no results were found, try to correct typos. 1430 TypoCorrection Corr; 1431 if (R.empty() && BaseType.isNull() && 1432 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1433 ClassDecl, false, CTC_NoKeywords))) { 1434 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1435 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1436 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1437 if (Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl)) { 1438 // We have found a non-static data member with a similar 1439 // name to what was typed; complain and initialize that 1440 // member. 1441 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1442 << MemberOrBase << true << CorrectedQuotedStr 1443 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1444 Diag(Member->getLocation(), diag::note_previous_decl) 1445 << CorrectedQuotedStr; 1446 1447 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 1448 LParenLoc, RParenLoc); 1449 } 1450 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1451 const CXXBaseSpecifier *DirectBaseSpec; 1452 const CXXBaseSpecifier *VirtualBaseSpec; 1453 if (FindBaseInitializer(*this, ClassDecl, 1454 Context.getTypeDeclType(Type), 1455 DirectBaseSpec, VirtualBaseSpec)) { 1456 // We have found a direct or virtual base class with a 1457 // similar name to what was typed; complain and initialize 1458 // that base class. 1459 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1460 << MemberOrBase << false << CorrectedQuotedStr 1461 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1462 1463 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1464 : VirtualBaseSpec; 1465 Diag(BaseSpec->getSourceRange().getBegin(), 1466 diag::note_base_class_specified_here) 1467 << BaseSpec->getType() 1468 << BaseSpec->getSourceRange(); 1469 1470 TyD = Type; 1471 } 1472 } 1473 } 1474 1475 if (!TyD && BaseType.isNull()) { 1476 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1477 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 1478 return true; 1479 } 1480 } 1481 1482 if (BaseType.isNull()) { 1483 BaseType = Context.getTypeDeclType(TyD); 1484 if (SS.isSet()) { 1485 NestedNameSpecifier *Qualifier = 1486 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1487 1488 // FIXME: preserve source range information 1489 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1490 } 1491 } 1492 } 1493 1494 if (!TInfo) 1495 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1496 1497 return BuildBaseInitializer(BaseType, TInfo, (Expr **)Args, NumArgs, 1498 LParenLoc, RParenLoc, ClassDecl, EllipsisLoc); 1499} 1500 1501/// Checks an initializer expression for use of uninitialized fields, such as 1502/// containing the field that is being initialized. Returns true if there is an 1503/// uninitialized field was used an updates the SourceLocation parameter; false 1504/// otherwise. 1505static bool InitExprContainsUninitializedFields(const Stmt *S, 1506 const ValueDecl *LhsField, 1507 SourceLocation *L) { 1508 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 1509 1510 if (isa<CallExpr>(S)) { 1511 // Do not descend into function calls or constructors, as the use 1512 // of an uninitialized field may be valid. One would have to inspect 1513 // the contents of the function/ctor to determine if it is safe or not. 1514 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 1515 // may be safe, depending on what the function/ctor does. 1516 return false; 1517 } 1518 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 1519 const NamedDecl *RhsField = ME->getMemberDecl(); 1520 1521 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 1522 // The member expression points to a static data member. 1523 assert(VD->isStaticDataMember() && 1524 "Member points to non-static data member!"); 1525 (void)VD; 1526 return false; 1527 } 1528 1529 if (isa<EnumConstantDecl>(RhsField)) { 1530 // The member expression points to an enum. 1531 return false; 1532 } 1533 1534 if (RhsField == LhsField) { 1535 // Initializing a field with itself. Throw a warning. 1536 // But wait; there are exceptions! 1537 // Exception #1: The field may not belong to this record. 1538 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 1539 const Expr *base = ME->getBase(); 1540 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 1541 // Even though the field matches, it does not belong to this record. 1542 return false; 1543 } 1544 // None of the exceptions triggered; return true to indicate an 1545 // uninitialized field was used. 1546 *L = ME->getMemberLoc(); 1547 return true; 1548 } 1549 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 1550 // sizeof/alignof doesn't reference contents, do not warn. 1551 return false; 1552 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 1553 // address-of doesn't reference contents (the pointer may be dereferenced 1554 // in the same expression but it would be rare; and weird). 1555 if (UOE->getOpcode() == UO_AddrOf) 1556 return false; 1557 } 1558 for (Stmt::const_child_range it = S->children(); it; ++it) { 1559 if (!*it) { 1560 // An expression such as 'member(arg ?: "")' may trigger this. 1561 continue; 1562 } 1563 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 1564 return true; 1565 } 1566 return false; 1567} 1568 1569MemInitResult 1570Sema::BuildMemberInitializer(ValueDecl *Member, Expr **Args, 1571 unsigned NumArgs, SourceLocation IdLoc, 1572 SourceLocation LParenLoc, 1573 SourceLocation RParenLoc) { 1574 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 1575 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 1576 assert((DirectMember || IndirectMember) && 1577 "Member must be a FieldDecl or IndirectFieldDecl"); 1578 1579 if (Member->isInvalidDecl()) 1580 return true; 1581 1582 // Diagnose value-uses of fields to initialize themselves, e.g. 1583 // foo(foo) 1584 // where foo is not also a parameter to the constructor. 1585 // TODO: implement -Wuninitialized and fold this into that framework. 1586 for (unsigned i = 0; i < NumArgs; ++i) { 1587 SourceLocation L; 1588 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 1589 // FIXME: Return true in the case when other fields are used before being 1590 // uninitialized. For example, let this field be the i'th field. When 1591 // initializing the i'th field, throw a warning if any of the >= i'th 1592 // fields are used, as they are not yet initialized. 1593 // Right now we are only handling the case where the i'th field uses 1594 // itself in its initializer. 1595 Diag(L, diag::warn_field_is_uninit); 1596 } 1597 } 1598 1599 bool HasDependentArg = false; 1600 for (unsigned i = 0; i < NumArgs; i++) 1601 HasDependentArg |= Args[i]->isTypeDependent(); 1602 1603 Expr *Init; 1604 if (Member->getType()->isDependentType() || HasDependentArg) { 1605 // Can't check initialization for a member of dependent type or when 1606 // any of the arguments are type-dependent expressions. 1607 Init = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1608 RParenLoc, 1609 Member->getType().getNonReferenceType()); 1610 1611 DiscardCleanupsInEvaluationContext(); 1612 } else { 1613 // Initialize the member. 1614 InitializedEntity MemberEntity = 1615 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 1616 : InitializedEntity::InitializeMember(IndirectMember, 0); 1617 InitializationKind Kind = 1618 InitializationKind::CreateDirect(IdLoc, LParenLoc, RParenLoc); 1619 1620 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 1621 1622 ExprResult MemberInit = 1623 InitSeq.Perform(*this, MemberEntity, Kind, 1624 MultiExprArg(*this, Args, NumArgs), 0); 1625 if (MemberInit.isInvalid()) 1626 return true; 1627 1628 CheckImplicitConversions(MemberInit.get(), LParenLoc); 1629 1630 // C++0x [class.base.init]p7: 1631 // The initialization of each base and member constitutes a 1632 // full-expression. 1633 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 1634 if (MemberInit.isInvalid()) 1635 return true; 1636 1637 // If we are in a dependent context, template instantiation will 1638 // perform this type-checking again. Just save the arguments that we 1639 // received in a ParenListExpr. 1640 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1641 // of the information that we have about the member 1642 // initializer. However, deconstructing the ASTs is a dicey process, 1643 // and this approach is far more likely to get the corner cases right. 1644 if (CurContext->isDependentContext()) 1645 Init = new (Context) ParenListExpr( 1646 Context, LParenLoc, Args, NumArgs, RParenLoc, 1647 Member->getType().getNonReferenceType()); 1648 else 1649 Init = MemberInit.get(); 1650 } 1651 1652 if (DirectMember) { 1653 return new (Context) CXXCtorInitializer(Context, DirectMember, 1654 IdLoc, LParenLoc, Init, 1655 RParenLoc); 1656 } else { 1657 return new (Context) CXXCtorInitializer(Context, IndirectMember, 1658 IdLoc, LParenLoc, Init, 1659 RParenLoc); 1660 } 1661} 1662 1663MemInitResult 1664Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, 1665 Expr **Args, unsigned NumArgs, 1666 SourceLocation NameLoc, 1667 SourceLocation LParenLoc, 1668 SourceLocation RParenLoc, 1669 CXXRecordDecl *ClassDecl) { 1670 SourceLocation Loc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1671 if (!LangOpts.CPlusPlus0x) 1672 return Diag(Loc, diag::err_delegation_0x_only) 1673 << TInfo->getTypeLoc().getLocalSourceRange(); 1674 1675 // Initialize the object. 1676 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 1677 QualType(ClassDecl->getTypeForDecl(), 0)); 1678 InitializationKind Kind = 1679 InitializationKind::CreateDirect(NameLoc, LParenLoc, RParenLoc); 1680 1681 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 1682 1683 ExprResult DelegationInit = 1684 InitSeq.Perform(*this, DelegationEntity, Kind, 1685 MultiExprArg(*this, Args, NumArgs), 0); 1686 if (DelegationInit.isInvalid()) 1687 return true; 1688 1689 CXXConstructExpr *ConExpr = cast<CXXConstructExpr>(DelegationInit.get()); 1690 CXXConstructorDecl *Constructor 1691 = ConExpr->getConstructor(); 1692 assert(Constructor && "Delegating constructor with no target?"); 1693 1694 CheckImplicitConversions(DelegationInit.get(), LParenLoc); 1695 1696 // C++0x [class.base.init]p7: 1697 // The initialization of each base and member constitutes a 1698 // full-expression. 1699 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 1700 if (DelegationInit.isInvalid()) 1701 return true; 1702 1703 assert(!CurContext->isDependentContext()); 1704 return new (Context) CXXCtorInitializer(Context, Loc, LParenLoc, Constructor, 1705 DelegationInit.takeAs<Expr>(), 1706 RParenLoc); 1707} 1708 1709MemInitResult 1710Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 1711 Expr **Args, unsigned NumArgs, 1712 SourceLocation LParenLoc, SourceLocation RParenLoc, 1713 CXXRecordDecl *ClassDecl, 1714 SourceLocation EllipsisLoc) { 1715 bool HasDependentArg = false; 1716 for (unsigned i = 0; i < NumArgs; i++) 1717 HasDependentArg |= Args[i]->isTypeDependent(); 1718 1719 SourceLocation BaseLoc 1720 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 1721 1722 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 1723 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 1724 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1725 1726 // C++ [class.base.init]p2: 1727 // [...] Unless the mem-initializer-id names a nonstatic data 1728 // member of the constructor's class or a direct or virtual base 1729 // of that class, the mem-initializer is ill-formed. A 1730 // mem-initializer-list can initialize a base class using any 1731 // name that denotes that base class type. 1732 bool Dependent = BaseType->isDependentType() || HasDependentArg; 1733 1734 if (EllipsisLoc.isValid()) { 1735 // This is a pack expansion. 1736 if (!BaseType->containsUnexpandedParameterPack()) { 1737 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1738 << SourceRange(BaseLoc, RParenLoc); 1739 1740 EllipsisLoc = SourceLocation(); 1741 } 1742 } else { 1743 // Check for any unexpanded parameter packs. 1744 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 1745 return true; 1746 1747 for (unsigned I = 0; I != NumArgs; ++I) 1748 if (DiagnoseUnexpandedParameterPack(Args[I])) 1749 return true; 1750 } 1751 1752 // Check for direct and virtual base classes. 1753 const CXXBaseSpecifier *DirectBaseSpec = 0; 1754 const CXXBaseSpecifier *VirtualBaseSpec = 0; 1755 if (!Dependent) { 1756 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 1757 BaseType)) 1758 return BuildDelegatingInitializer(BaseTInfo, Args, NumArgs, BaseLoc, 1759 LParenLoc, RParenLoc, ClassDecl); 1760 1761 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 1762 VirtualBaseSpec); 1763 1764 // C++ [base.class.init]p2: 1765 // Unless the mem-initializer-id names a nonstatic data member of the 1766 // constructor's class or a direct or virtual base of that class, the 1767 // mem-initializer is ill-formed. 1768 if (!DirectBaseSpec && !VirtualBaseSpec) { 1769 // If the class has any dependent bases, then it's possible that 1770 // one of those types will resolve to the same type as 1771 // BaseType. Therefore, just treat this as a dependent base 1772 // class initialization. FIXME: Should we try to check the 1773 // initialization anyway? It seems odd. 1774 if (ClassDecl->hasAnyDependentBases()) 1775 Dependent = true; 1776 else 1777 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 1778 << BaseType << Context.getTypeDeclType(ClassDecl) 1779 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1780 } 1781 } 1782 1783 if (Dependent) { 1784 // Can't check initialization for a base of dependent type or when 1785 // any of the arguments are type-dependent expressions. 1786 ExprResult BaseInit 1787 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1788 RParenLoc, BaseType)); 1789 1790 DiscardCleanupsInEvaluationContext(); 1791 1792 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1793 /*IsVirtual=*/false, 1794 LParenLoc, 1795 BaseInit.takeAs<Expr>(), 1796 RParenLoc, 1797 EllipsisLoc); 1798 } 1799 1800 // C++ [base.class.init]p2: 1801 // If a mem-initializer-id is ambiguous because it designates both 1802 // a direct non-virtual base class and an inherited virtual base 1803 // class, the mem-initializer is ill-formed. 1804 if (DirectBaseSpec && VirtualBaseSpec) 1805 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 1806 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 1807 1808 CXXBaseSpecifier *BaseSpec 1809 = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 1810 if (!BaseSpec) 1811 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 1812 1813 // Initialize the base. 1814 InitializedEntity BaseEntity = 1815 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 1816 InitializationKind Kind = 1817 InitializationKind::CreateDirect(BaseLoc, LParenLoc, RParenLoc); 1818 1819 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 1820 1821 ExprResult BaseInit = 1822 InitSeq.Perform(*this, BaseEntity, Kind, 1823 MultiExprArg(*this, Args, NumArgs), 0); 1824 if (BaseInit.isInvalid()) 1825 return true; 1826 1827 CheckImplicitConversions(BaseInit.get(), LParenLoc); 1828 1829 // C++0x [class.base.init]p7: 1830 // The initialization of each base and member constitutes a 1831 // full-expression. 1832 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 1833 if (BaseInit.isInvalid()) 1834 return true; 1835 1836 // If we are in a dependent context, template instantiation will 1837 // perform this type-checking again. Just save the arguments that we 1838 // received in a ParenListExpr. 1839 // FIXME: This isn't quite ideal, since our ASTs don't capture all 1840 // of the information that we have about the base 1841 // initializer. However, deconstructing the ASTs is a dicey process, 1842 // and this approach is far more likely to get the corner cases right. 1843 if (CurContext->isDependentContext()) { 1844 ExprResult Init 1845 = Owned(new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1846 RParenLoc, BaseType)); 1847 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1848 BaseSpec->isVirtual(), 1849 LParenLoc, 1850 Init.takeAs<Expr>(), 1851 RParenLoc, 1852 EllipsisLoc); 1853 } 1854 1855 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 1856 BaseSpec->isVirtual(), 1857 LParenLoc, 1858 BaseInit.takeAs<Expr>(), 1859 RParenLoc, 1860 EllipsisLoc); 1861} 1862 1863/// ImplicitInitializerKind - How an implicit base or member initializer should 1864/// initialize its base or member. 1865enum ImplicitInitializerKind { 1866 IIK_Default, 1867 IIK_Copy, 1868 IIK_Move 1869}; 1870 1871static bool 1872BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1873 ImplicitInitializerKind ImplicitInitKind, 1874 CXXBaseSpecifier *BaseSpec, 1875 bool IsInheritedVirtualBase, 1876 CXXCtorInitializer *&CXXBaseInit) { 1877 InitializedEntity InitEntity 1878 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 1879 IsInheritedVirtualBase); 1880 1881 ExprResult BaseInit; 1882 1883 switch (ImplicitInitKind) { 1884 case IIK_Default: { 1885 InitializationKind InitKind 1886 = InitializationKind::CreateDefault(Constructor->getLocation()); 1887 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 1888 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1889 MultiExprArg(SemaRef, 0, 0)); 1890 break; 1891 } 1892 1893 case IIK_Copy: { 1894 ParmVarDecl *Param = Constructor->getParamDecl(0); 1895 QualType ParamType = Param->getType().getNonReferenceType(); 1896 1897 Expr *CopyCtorArg = 1898 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1899 Constructor->getLocation(), ParamType, 1900 VK_LValue, 0); 1901 1902 // Cast to the base class to avoid ambiguities. 1903 QualType ArgTy = 1904 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 1905 ParamType.getQualifiers()); 1906 1907 CXXCastPath BasePath; 1908 BasePath.push_back(BaseSpec); 1909 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 1910 CK_UncheckedDerivedToBase, 1911 VK_LValue, &BasePath).take(); 1912 1913 InitializationKind InitKind 1914 = InitializationKind::CreateDirect(Constructor->getLocation(), 1915 SourceLocation(), SourceLocation()); 1916 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 1917 &CopyCtorArg, 1); 1918 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 1919 MultiExprArg(&CopyCtorArg, 1)); 1920 break; 1921 } 1922 1923 case IIK_Move: 1924 assert(false && "Unhandled initializer kind!"); 1925 } 1926 1927 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 1928 if (BaseInit.isInvalid()) 1929 return true; 1930 1931 CXXBaseInit = 1932 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 1933 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 1934 SourceLocation()), 1935 BaseSpec->isVirtual(), 1936 SourceLocation(), 1937 BaseInit.takeAs<Expr>(), 1938 SourceLocation(), 1939 SourceLocation()); 1940 1941 return false; 1942} 1943 1944static bool 1945BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 1946 ImplicitInitializerKind ImplicitInitKind, 1947 FieldDecl *Field, IndirectFieldDecl *Indirect, 1948 CXXCtorInitializer *&CXXMemberInit) { 1949 if (Field->isInvalidDecl()) 1950 return true; 1951 1952 SourceLocation Loc = Constructor->getLocation(); 1953 1954 if (ImplicitInitKind == IIK_Copy) { 1955 ParmVarDecl *Param = Constructor->getParamDecl(0); 1956 QualType ParamType = Param->getType().getNonReferenceType(); 1957 1958 // Suppress copying zero-width bitfields. 1959 if (const Expr *Width = Field->getBitWidth()) 1960 if (Width->EvaluateAsInt(SemaRef.Context) == 0) 1961 return false; 1962 1963 Expr *MemberExprBase = 1964 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), Param, 1965 Loc, ParamType, VK_LValue, 0); 1966 1967 // Build a reference to this field within the parameter. 1968 CXXScopeSpec SS; 1969 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 1970 Sema::LookupMemberName); 1971 MemberLookup.addDecl(Indirect? cast<ValueDecl>(Indirect) : cast<ValueDecl>(Field), AS_public); 1972 MemberLookup.resolveKind(); 1973 ExprResult CopyCtorArg 1974 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 1975 ParamType, Loc, 1976 /*IsArrow=*/false, 1977 SS, 1978 /*FirstQualifierInScope=*/0, 1979 MemberLookup, 1980 /*TemplateArgs=*/0); 1981 if (CopyCtorArg.isInvalid()) 1982 return true; 1983 1984 // When the field we are copying is an array, create index variables for 1985 // each dimension of the array. We use these index variables to subscript 1986 // the source array, and other clients (e.g., CodeGen) will perform the 1987 // necessary iteration with these index variables. 1988 SmallVector<VarDecl *, 4> IndexVariables; 1989 QualType BaseType = Field->getType(); 1990 QualType SizeType = SemaRef.Context.getSizeType(); 1991 while (const ConstantArrayType *Array 1992 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 1993 // Create the iteration variable for this array index. 1994 IdentifierInfo *IterationVarName = 0; 1995 { 1996 llvm::SmallString<8> Str; 1997 llvm::raw_svector_ostream OS(Str); 1998 OS << "__i" << IndexVariables.size(); 1999 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2000 } 2001 VarDecl *IterationVar 2002 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2003 IterationVarName, SizeType, 2004 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2005 SC_None, SC_None); 2006 IndexVariables.push_back(IterationVar); 2007 2008 // Create a reference to the iteration variable. 2009 ExprResult IterationVarRef 2010 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc); 2011 assert(!IterationVarRef.isInvalid() && 2012 "Reference to invented variable cannot fail!"); 2013 2014 // Subscript the array with this iteration variable. 2015 CopyCtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CopyCtorArg.take(), 2016 Loc, 2017 IterationVarRef.take(), 2018 Loc); 2019 if (CopyCtorArg.isInvalid()) 2020 return true; 2021 2022 BaseType = Array->getElementType(); 2023 } 2024 2025 // Construct the entity that we will be initializing. For an array, this 2026 // will be first element in the array, which may require several levels 2027 // of array-subscript entities. 2028 SmallVector<InitializedEntity, 4> Entities; 2029 Entities.reserve(1 + IndexVariables.size()); 2030 if (Indirect) 2031 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2032 else 2033 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2034 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2035 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2036 0, 2037 Entities.back())); 2038 2039 // Direct-initialize to use the copy constructor. 2040 InitializationKind InitKind = 2041 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2042 2043 Expr *CopyCtorArgE = CopyCtorArg.takeAs<Expr>(); 2044 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2045 &CopyCtorArgE, 1); 2046 2047 ExprResult MemberInit 2048 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2049 MultiExprArg(&CopyCtorArgE, 1)); 2050 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2051 if (MemberInit.isInvalid()) 2052 return true; 2053 2054 if (Indirect) { 2055 assert(IndexVariables.size() == 0 && 2056 "Indirect field improperly initialized"); 2057 CXXMemberInit 2058 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2059 Loc, Loc, 2060 MemberInit.takeAs<Expr>(), 2061 Loc); 2062 } else 2063 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2064 Loc, MemberInit.takeAs<Expr>(), 2065 Loc, 2066 IndexVariables.data(), 2067 IndexVariables.size()); 2068 return false; 2069 } 2070 2071 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2072 2073 QualType FieldBaseElementType = 2074 SemaRef.Context.getBaseElementType(Field->getType()); 2075 2076 if (FieldBaseElementType->isRecordType()) { 2077 InitializedEntity InitEntity 2078 = Indirect? InitializedEntity::InitializeMember(Indirect) 2079 : InitializedEntity::InitializeMember(Field); 2080 InitializationKind InitKind = 2081 InitializationKind::CreateDefault(Loc); 2082 2083 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2084 ExprResult MemberInit = 2085 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2086 2087 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2088 if (MemberInit.isInvalid()) 2089 return true; 2090 2091 if (Indirect) 2092 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2093 Indirect, Loc, 2094 Loc, 2095 MemberInit.get(), 2096 Loc); 2097 else 2098 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2099 Field, Loc, Loc, 2100 MemberInit.get(), 2101 Loc); 2102 return false; 2103 } 2104 2105 if (!Field->getParent()->isUnion()) { 2106 if (FieldBaseElementType->isReferenceType()) { 2107 SemaRef.Diag(Constructor->getLocation(), 2108 diag::err_uninitialized_member_in_ctor) 2109 << (int)Constructor->isImplicit() 2110 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2111 << 0 << Field->getDeclName(); 2112 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2113 return true; 2114 } 2115 2116 if (FieldBaseElementType.isConstQualified()) { 2117 SemaRef.Diag(Constructor->getLocation(), 2118 diag::err_uninitialized_member_in_ctor) 2119 << (int)Constructor->isImplicit() 2120 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2121 << 1 << Field->getDeclName(); 2122 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2123 return true; 2124 } 2125 } 2126 2127 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2128 FieldBaseElementType->isObjCRetainableType() && 2129 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2130 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2131 // Instant objects: 2132 // Default-initialize Objective-C pointers to NULL. 2133 CXXMemberInit 2134 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2135 Loc, Loc, 2136 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2137 Loc); 2138 return false; 2139 } 2140 2141 // Nothing to initialize. 2142 CXXMemberInit = 0; 2143 return false; 2144} 2145 2146namespace { 2147struct BaseAndFieldInfo { 2148 Sema &S; 2149 CXXConstructorDecl *Ctor; 2150 bool AnyErrorsInInits; 2151 ImplicitInitializerKind IIK; 2152 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2153 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2154 2155 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2156 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2157 // FIXME: Handle implicit move constructors. 2158 if (Ctor->isImplicit() && Ctor->isCopyConstructor()) 2159 IIK = IIK_Copy; 2160 else 2161 IIK = IIK_Default; 2162 } 2163}; 2164} 2165 2166static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2167 FieldDecl *Field, 2168 IndirectFieldDecl *Indirect = 0) { 2169 2170 // Overwhelmingly common case: we have a direct initializer for this field. 2171 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2172 Info.AllToInit.push_back(Init); 2173 return false; 2174 } 2175 2176 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2177 // has a brace-or-equal-initializer, the entity is initialized as specified 2178 // in [dcl.init]. 2179 if (Field->hasInClassInitializer()) { 2180 CXXCtorInitializer *Init; 2181 if (Indirect) 2182 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2183 SourceLocation(), 2184 SourceLocation(), 0, 2185 SourceLocation()); 2186 else 2187 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2188 SourceLocation(), 2189 SourceLocation(), 0, 2190 SourceLocation()); 2191 Info.AllToInit.push_back(Init); 2192 return false; 2193 } 2194 2195 // Don't try to build an implicit initializer if there were semantic 2196 // errors in any of the initializers (and therefore we might be 2197 // missing some that the user actually wrote). 2198 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2199 return false; 2200 2201 CXXCtorInitializer *Init = 0; 2202 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2203 Indirect, Init)) 2204 return true; 2205 2206 if (Init) 2207 Info.AllToInit.push_back(Init); 2208 2209 return false; 2210} 2211 2212bool 2213Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2214 CXXCtorInitializer *Initializer) { 2215 assert(Initializer->isDelegatingInitializer()); 2216 Constructor->setNumCtorInitializers(1); 2217 CXXCtorInitializer **initializer = 2218 new (Context) CXXCtorInitializer*[1]; 2219 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2220 Constructor->setCtorInitializers(initializer); 2221 2222 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2223 MarkDeclarationReferenced(Initializer->getSourceLocation(), Dtor); 2224 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2225 } 2226 2227 DelegatingCtorDecls.push_back(Constructor); 2228 2229 return false; 2230} 2231 2232/// \brief Determine whether the given indirect field declaration is somewhere 2233/// within an anonymous union. 2234static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2235 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2236 CEnd = F->chain_end(); 2237 C != CEnd; ++C) 2238 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2239 if (Record->isUnion()) 2240 return true; 2241 2242 return false; 2243} 2244 2245bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2246 CXXCtorInitializer **Initializers, 2247 unsigned NumInitializers, 2248 bool AnyErrors) { 2249 if (Constructor->getDeclContext()->isDependentContext()) { 2250 // Just store the initializers as written, they will be checked during 2251 // instantiation. 2252 if (NumInitializers > 0) { 2253 Constructor->setNumCtorInitializers(NumInitializers); 2254 CXXCtorInitializer **baseOrMemberInitializers = 2255 new (Context) CXXCtorInitializer*[NumInitializers]; 2256 memcpy(baseOrMemberInitializers, Initializers, 2257 NumInitializers * sizeof(CXXCtorInitializer*)); 2258 Constructor->setCtorInitializers(baseOrMemberInitializers); 2259 } 2260 2261 return false; 2262 } 2263 2264 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2265 2266 // We need to build the initializer AST according to order of construction 2267 // and not what user specified in the Initializers list. 2268 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2269 if (!ClassDecl) 2270 return true; 2271 2272 bool HadError = false; 2273 2274 for (unsigned i = 0; i < NumInitializers; i++) { 2275 CXXCtorInitializer *Member = Initializers[i]; 2276 2277 if (Member->isBaseInitializer()) 2278 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2279 else 2280 Info.AllBaseFields[Member->getAnyMember()] = Member; 2281 } 2282 2283 // Keep track of the direct virtual bases. 2284 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2285 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2286 E = ClassDecl->bases_end(); I != E; ++I) { 2287 if (I->isVirtual()) 2288 DirectVBases.insert(I); 2289 } 2290 2291 // Push virtual bases before others. 2292 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2293 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2294 2295 if (CXXCtorInitializer *Value 2296 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2297 Info.AllToInit.push_back(Value); 2298 } else if (!AnyErrors) { 2299 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2300 CXXCtorInitializer *CXXBaseInit; 2301 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2302 VBase, IsInheritedVirtualBase, 2303 CXXBaseInit)) { 2304 HadError = true; 2305 continue; 2306 } 2307 2308 Info.AllToInit.push_back(CXXBaseInit); 2309 } 2310 } 2311 2312 // Non-virtual bases. 2313 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2314 E = ClassDecl->bases_end(); Base != E; ++Base) { 2315 // Virtuals are in the virtual base list and already constructed. 2316 if (Base->isVirtual()) 2317 continue; 2318 2319 if (CXXCtorInitializer *Value 2320 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2321 Info.AllToInit.push_back(Value); 2322 } else if (!AnyErrors) { 2323 CXXCtorInitializer *CXXBaseInit; 2324 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2325 Base, /*IsInheritedVirtualBase=*/false, 2326 CXXBaseInit)) { 2327 HadError = true; 2328 continue; 2329 } 2330 2331 Info.AllToInit.push_back(CXXBaseInit); 2332 } 2333 } 2334 2335 // Fields. 2336 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2337 MemEnd = ClassDecl->decls_end(); 2338 Mem != MemEnd; ++Mem) { 2339 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2340 if (F->getType()->isIncompleteArrayType()) { 2341 assert(ClassDecl->hasFlexibleArrayMember() && 2342 "Incomplete array type is not valid"); 2343 continue; 2344 } 2345 2346 // If we're not generating the implicit copy constructor, then we'll 2347 // handle anonymous struct/union fields based on their individual 2348 // indirect fields. 2349 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2350 continue; 2351 2352 if (CollectFieldInitializer(*this, Info, F)) 2353 HadError = true; 2354 continue; 2355 } 2356 2357 // Beyond this point, we only consider default initialization. 2358 if (Info.IIK != IIK_Default) 2359 continue; 2360 2361 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2362 if (F->getType()->isIncompleteArrayType()) { 2363 assert(ClassDecl->hasFlexibleArrayMember() && 2364 "Incomplete array type is not valid"); 2365 continue; 2366 } 2367 2368 // If this field is somewhere within an anonymous union, we only 2369 // initialize it if there's an explicit initializer. 2370 if (isWithinAnonymousUnion(F)) { 2371 if (CXXCtorInitializer *Init 2372 = Info.AllBaseFields.lookup(F->getAnonField())) { 2373 Info.AllToInit.push_back(Init); 2374 } 2375 2376 continue; 2377 } 2378 2379 // Initialize each field of an anonymous struct individually. 2380 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2381 HadError = true; 2382 2383 continue; 2384 } 2385 } 2386 2387 NumInitializers = Info.AllToInit.size(); 2388 if (NumInitializers > 0) { 2389 Constructor->setNumCtorInitializers(NumInitializers); 2390 CXXCtorInitializer **baseOrMemberInitializers = 2391 new (Context) CXXCtorInitializer*[NumInitializers]; 2392 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2393 NumInitializers * sizeof(CXXCtorInitializer*)); 2394 Constructor->setCtorInitializers(baseOrMemberInitializers); 2395 2396 // Constructors implicitly reference the base and member 2397 // destructors. 2398 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2399 Constructor->getParent()); 2400 } 2401 2402 return HadError; 2403} 2404 2405static void *GetKeyForTopLevelField(FieldDecl *Field) { 2406 // For anonymous unions, use the class declaration as the key. 2407 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2408 if (RT->getDecl()->isAnonymousStructOrUnion()) 2409 return static_cast<void *>(RT->getDecl()); 2410 } 2411 return static_cast<void *>(Field); 2412} 2413 2414static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2415 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2416} 2417 2418static void *GetKeyForMember(ASTContext &Context, 2419 CXXCtorInitializer *Member) { 2420 if (!Member->isAnyMemberInitializer()) 2421 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2422 2423 // For fields injected into the class via declaration of an anonymous union, 2424 // use its anonymous union class declaration as the unique key. 2425 FieldDecl *Field = Member->getAnyMember(); 2426 2427 // If the field is a member of an anonymous struct or union, our key 2428 // is the anonymous record decl that's a direct child of the class. 2429 RecordDecl *RD = Field->getParent(); 2430 if (RD->isAnonymousStructOrUnion()) { 2431 while (true) { 2432 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 2433 if (Parent->isAnonymousStructOrUnion()) 2434 RD = Parent; 2435 else 2436 break; 2437 } 2438 2439 return static_cast<void *>(RD); 2440 } 2441 2442 return static_cast<void *>(Field); 2443} 2444 2445static void 2446DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 2447 const CXXConstructorDecl *Constructor, 2448 CXXCtorInitializer **Inits, 2449 unsigned NumInits) { 2450 if (Constructor->getDeclContext()->isDependentContext()) 2451 return; 2452 2453 // Don't check initializers order unless the warning is enabled at the 2454 // location of at least one initializer. 2455 bool ShouldCheckOrder = false; 2456 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2457 CXXCtorInitializer *Init = Inits[InitIndex]; 2458 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 2459 Init->getSourceLocation()) 2460 != Diagnostic::Ignored) { 2461 ShouldCheckOrder = true; 2462 break; 2463 } 2464 } 2465 if (!ShouldCheckOrder) 2466 return; 2467 2468 // Build the list of bases and members in the order that they'll 2469 // actually be initialized. The explicit initializers should be in 2470 // this same order but may be missing things. 2471 SmallVector<const void*, 32> IdealInitKeys; 2472 2473 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 2474 2475 // 1. Virtual bases. 2476 for (CXXRecordDecl::base_class_const_iterator VBase = 2477 ClassDecl->vbases_begin(), 2478 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 2479 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 2480 2481 // 2. Non-virtual bases. 2482 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 2483 E = ClassDecl->bases_end(); Base != E; ++Base) { 2484 if (Base->isVirtual()) 2485 continue; 2486 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 2487 } 2488 2489 // 3. Direct fields. 2490 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2491 E = ClassDecl->field_end(); Field != E; ++Field) 2492 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 2493 2494 unsigned NumIdealInits = IdealInitKeys.size(); 2495 unsigned IdealIndex = 0; 2496 2497 CXXCtorInitializer *PrevInit = 0; 2498 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 2499 CXXCtorInitializer *Init = Inits[InitIndex]; 2500 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 2501 2502 // Scan forward to try to find this initializer in the idealized 2503 // initializers list. 2504 for (; IdealIndex != NumIdealInits; ++IdealIndex) 2505 if (InitKey == IdealInitKeys[IdealIndex]) 2506 break; 2507 2508 // If we didn't find this initializer, it must be because we 2509 // scanned past it on a previous iteration. That can only 2510 // happen if we're out of order; emit a warning. 2511 if (IdealIndex == NumIdealInits && PrevInit) { 2512 Sema::SemaDiagnosticBuilder D = 2513 SemaRef.Diag(PrevInit->getSourceLocation(), 2514 diag::warn_initializer_out_of_order); 2515 2516 if (PrevInit->isAnyMemberInitializer()) 2517 D << 0 << PrevInit->getAnyMember()->getDeclName(); 2518 else 2519 D << 1 << PrevInit->getBaseClassInfo()->getType(); 2520 2521 if (Init->isAnyMemberInitializer()) 2522 D << 0 << Init->getAnyMember()->getDeclName(); 2523 else 2524 D << 1 << Init->getBaseClassInfo()->getType(); 2525 2526 // Move back to the initializer's location in the ideal list. 2527 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 2528 if (InitKey == IdealInitKeys[IdealIndex]) 2529 break; 2530 2531 assert(IdealIndex != NumIdealInits && 2532 "initializer not found in initializer list"); 2533 } 2534 2535 PrevInit = Init; 2536 } 2537} 2538 2539namespace { 2540bool CheckRedundantInit(Sema &S, 2541 CXXCtorInitializer *Init, 2542 CXXCtorInitializer *&PrevInit) { 2543 if (!PrevInit) { 2544 PrevInit = Init; 2545 return false; 2546 } 2547 2548 if (FieldDecl *Field = Init->getMember()) 2549 S.Diag(Init->getSourceLocation(), 2550 diag::err_multiple_mem_initialization) 2551 << Field->getDeclName() 2552 << Init->getSourceRange(); 2553 else { 2554 const Type *BaseClass = Init->getBaseClass(); 2555 assert(BaseClass && "neither field nor base"); 2556 S.Diag(Init->getSourceLocation(), 2557 diag::err_multiple_base_initialization) 2558 << QualType(BaseClass, 0) 2559 << Init->getSourceRange(); 2560 } 2561 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 2562 << 0 << PrevInit->getSourceRange(); 2563 2564 return true; 2565} 2566 2567typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 2568typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 2569 2570bool CheckRedundantUnionInit(Sema &S, 2571 CXXCtorInitializer *Init, 2572 RedundantUnionMap &Unions) { 2573 FieldDecl *Field = Init->getAnyMember(); 2574 RecordDecl *Parent = Field->getParent(); 2575 if (!Parent->isAnonymousStructOrUnion()) 2576 return false; 2577 2578 NamedDecl *Child = Field; 2579 do { 2580 if (Parent->isUnion()) { 2581 UnionEntry &En = Unions[Parent]; 2582 if (En.first && En.first != Child) { 2583 S.Diag(Init->getSourceLocation(), 2584 diag::err_multiple_mem_union_initialization) 2585 << Field->getDeclName() 2586 << Init->getSourceRange(); 2587 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 2588 << 0 << En.second->getSourceRange(); 2589 return true; 2590 } else if (!En.first) { 2591 En.first = Child; 2592 En.second = Init; 2593 } 2594 } 2595 2596 Child = Parent; 2597 Parent = cast<RecordDecl>(Parent->getDeclContext()); 2598 } while (Parent->isAnonymousStructOrUnion()); 2599 2600 return false; 2601} 2602} 2603 2604/// ActOnMemInitializers - Handle the member initializers for a constructor. 2605void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 2606 SourceLocation ColonLoc, 2607 MemInitTy **meminits, unsigned NumMemInits, 2608 bool AnyErrors) { 2609 if (!ConstructorDecl) 2610 return; 2611 2612 AdjustDeclIfTemplate(ConstructorDecl); 2613 2614 CXXConstructorDecl *Constructor 2615 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 2616 2617 if (!Constructor) { 2618 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 2619 return; 2620 } 2621 2622 CXXCtorInitializer **MemInits = 2623 reinterpret_cast<CXXCtorInitializer **>(meminits); 2624 2625 // Mapping for the duplicate initializers check. 2626 // For member initializers, this is keyed with a FieldDecl*. 2627 // For base initializers, this is keyed with a Type*. 2628 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 2629 2630 // Mapping for the inconsistent anonymous-union initializers check. 2631 RedundantUnionMap MemberUnions; 2632 2633 bool HadError = false; 2634 for (unsigned i = 0; i < NumMemInits; i++) { 2635 CXXCtorInitializer *Init = MemInits[i]; 2636 2637 // Set the source order index. 2638 Init->setSourceOrder(i); 2639 2640 if (Init->isAnyMemberInitializer()) { 2641 FieldDecl *Field = Init->getAnyMember(); 2642 if (CheckRedundantInit(*this, Init, Members[Field]) || 2643 CheckRedundantUnionInit(*this, Init, MemberUnions)) 2644 HadError = true; 2645 } else if (Init->isBaseInitializer()) { 2646 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 2647 if (CheckRedundantInit(*this, Init, Members[Key])) 2648 HadError = true; 2649 } else { 2650 assert(Init->isDelegatingInitializer()); 2651 // This must be the only initializer 2652 if (i != 0 || NumMemInits > 1) { 2653 Diag(MemInits[0]->getSourceLocation(), 2654 diag::err_delegating_initializer_alone) 2655 << MemInits[0]->getSourceRange(); 2656 HadError = true; 2657 // We will treat this as being the only initializer. 2658 } 2659 SetDelegatingInitializer(Constructor, MemInits[i]); 2660 // Return immediately as the initializer is set. 2661 return; 2662 } 2663 } 2664 2665 if (HadError) 2666 return; 2667 2668 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 2669 2670 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 2671} 2672 2673void 2674Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 2675 CXXRecordDecl *ClassDecl) { 2676 // Ignore dependent contexts. 2677 if (ClassDecl->isDependentContext()) 2678 return; 2679 2680 // FIXME: all the access-control diagnostics are positioned on the 2681 // field/base declaration. That's probably good; that said, the 2682 // user might reasonably want to know why the destructor is being 2683 // emitted, and we currently don't say. 2684 2685 // Non-static data members. 2686 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 2687 E = ClassDecl->field_end(); I != E; ++I) { 2688 FieldDecl *Field = *I; 2689 if (Field->isInvalidDecl()) 2690 continue; 2691 QualType FieldType = Context.getBaseElementType(Field->getType()); 2692 2693 const RecordType* RT = FieldType->getAs<RecordType>(); 2694 if (!RT) 2695 continue; 2696 2697 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2698 if (FieldClassDecl->isInvalidDecl()) 2699 continue; 2700 if (FieldClassDecl->hasTrivialDestructor()) 2701 continue; 2702 2703 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 2704 assert(Dtor && "No dtor found for FieldClassDecl!"); 2705 CheckDestructorAccess(Field->getLocation(), Dtor, 2706 PDiag(diag::err_access_dtor_field) 2707 << Field->getDeclName() 2708 << FieldType); 2709 2710 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2711 } 2712 2713 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 2714 2715 // Bases. 2716 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2717 E = ClassDecl->bases_end(); Base != E; ++Base) { 2718 // Bases are always records in a well-formed non-dependent class. 2719 const RecordType *RT = Base->getType()->getAs<RecordType>(); 2720 2721 // Remember direct virtual bases. 2722 if (Base->isVirtual()) 2723 DirectVirtualBases.insert(RT); 2724 2725 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2726 // If our base class is invalid, we probably can't get its dtor anyway. 2727 if (BaseClassDecl->isInvalidDecl()) 2728 continue; 2729 // Ignore trivial destructors. 2730 if (BaseClassDecl->hasTrivialDestructor()) 2731 continue; 2732 2733 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2734 assert(Dtor && "No dtor found for BaseClassDecl!"); 2735 2736 // FIXME: caret should be on the start of the class name 2737 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 2738 PDiag(diag::err_access_dtor_base) 2739 << Base->getType() 2740 << Base->getSourceRange()); 2741 2742 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2743 } 2744 2745 // Virtual bases. 2746 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2747 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2748 2749 // Bases are always records in a well-formed non-dependent class. 2750 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 2751 2752 // Ignore direct virtual bases. 2753 if (DirectVirtualBases.count(RT)) 2754 continue; 2755 2756 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 2757 // If our base class is invalid, we probably can't get its dtor anyway. 2758 if (BaseClassDecl->isInvalidDecl()) 2759 continue; 2760 // Ignore trivial destructors. 2761 if (BaseClassDecl->hasTrivialDestructor()) 2762 continue; 2763 2764 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 2765 assert(Dtor && "No dtor found for BaseClassDecl!"); 2766 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 2767 PDiag(diag::err_access_dtor_vbase) 2768 << VBase->getType()); 2769 2770 MarkDeclarationReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 2771 } 2772} 2773 2774void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 2775 if (!CDtorDecl) 2776 return; 2777 2778 if (CXXConstructorDecl *Constructor 2779 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 2780 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 2781} 2782 2783bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2784 unsigned DiagID, AbstractDiagSelID SelID) { 2785 if (SelID == -1) 2786 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 2787 else 2788 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 2789} 2790 2791bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 2792 const PartialDiagnostic &PD) { 2793 if (!getLangOptions().CPlusPlus) 2794 return false; 2795 2796 if (const ArrayType *AT = Context.getAsArrayType(T)) 2797 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2798 2799 if (const PointerType *PT = T->getAs<PointerType>()) { 2800 // Find the innermost pointer type. 2801 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 2802 PT = T; 2803 2804 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 2805 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 2806 } 2807 2808 const RecordType *RT = T->getAs<RecordType>(); 2809 if (!RT) 2810 return false; 2811 2812 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 2813 2814 // We can't answer whether something is abstract until it has a 2815 // definition. If it's currently being defined, we'll walk back 2816 // over all the declarations when we have a full definition. 2817 const CXXRecordDecl *Def = RD->getDefinition(); 2818 if (!Def || Def->isBeingDefined()) 2819 return false; 2820 2821 if (!RD->isAbstract()) 2822 return false; 2823 2824 Diag(Loc, PD) << RD->getDeclName(); 2825 DiagnoseAbstractType(RD); 2826 2827 return true; 2828} 2829 2830void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 2831 // Check if we've already emitted the list of pure virtual functions 2832 // for this class. 2833 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 2834 return; 2835 2836 CXXFinalOverriderMap FinalOverriders; 2837 RD->getFinalOverriders(FinalOverriders); 2838 2839 // Keep a set of seen pure methods so we won't diagnose the same method 2840 // more than once. 2841 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 2842 2843 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 2844 MEnd = FinalOverriders.end(); 2845 M != MEnd; 2846 ++M) { 2847 for (OverridingMethods::iterator SO = M->second.begin(), 2848 SOEnd = M->second.end(); 2849 SO != SOEnd; ++SO) { 2850 // C++ [class.abstract]p4: 2851 // A class is abstract if it contains or inherits at least one 2852 // pure virtual function for which the final overrider is pure 2853 // virtual. 2854 2855 // 2856 if (SO->second.size() != 1) 2857 continue; 2858 2859 if (!SO->second.front().Method->isPure()) 2860 continue; 2861 2862 if (!SeenPureMethods.insert(SO->second.front().Method)) 2863 continue; 2864 2865 Diag(SO->second.front().Method->getLocation(), 2866 diag::note_pure_virtual_function) 2867 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 2868 } 2869 } 2870 2871 if (!PureVirtualClassDiagSet) 2872 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 2873 PureVirtualClassDiagSet->insert(RD); 2874} 2875 2876namespace { 2877struct AbstractUsageInfo { 2878 Sema &S; 2879 CXXRecordDecl *Record; 2880 CanQualType AbstractType; 2881 bool Invalid; 2882 2883 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 2884 : S(S), Record(Record), 2885 AbstractType(S.Context.getCanonicalType( 2886 S.Context.getTypeDeclType(Record))), 2887 Invalid(false) {} 2888 2889 void DiagnoseAbstractType() { 2890 if (Invalid) return; 2891 S.DiagnoseAbstractType(Record); 2892 Invalid = true; 2893 } 2894 2895 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 2896}; 2897 2898struct CheckAbstractUsage { 2899 AbstractUsageInfo &Info; 2900 const NamedDecl *Ctx; 2901 2902 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 2903 : Info(Info), Ctx(Ctx) {} 2904 2905 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2906 switch (TL.getTypeLocClass()) { 2907#define ABSTRACT_TYPELOC(CLASS, PARENT) 2908#define TYPELOC(CLASS, PARENT) \ 2909 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 2910#include "clang/AST/TypeLocNodes.def" 2911 } 2912 } 2913 2914 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2915 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 2916 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2917 if (!TL.getArg(I)) 2918 continue; 2919 2920 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 2921 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 2922 } 2923 } 2924 2925 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2926 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 2927 } 2928 2929 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 2930 // Visit the type parameters from a permissive context. 2931 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 2932 TemplateArgumentLoc TAL = TL.getArgLoc(I); 2933 if (TAL.getArgument().getKind() == TemplateArgument::Type) 2934 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 2935 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 2936 // TODO: other template argument types? 2937 } 2938 } 2939 2940 // Visit pointee types from a permissive context. 2941#define CheckPolymorphic(Type) \ 2942 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 2943 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 2944 } 2945 CheckPolymorphic(PointerTypeLoc) 2946 CheckPolymorphic(ReferenceTypeLoc) 2947 CheckPolymorphic(MemberPointerTypeLoc) 2948 CheckPolymorphic(BlockPointerTypeLoc) 2949 2950 /// Handle all the types we haven't given a more specific 2951 /// implementation for above. 2952 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 2953 // Every other kind of type that we haven't called out already 2954 // that has an inner type is either (1) sugar or (2) contains that 2955 // inner type in some way as a subobject. 2956 if (TypeLoc Next = TL.getNextTypeLoc()) 2957 return Visit(Next, Sel); 2958 2959 // If there's no inner type and we're in a permissive context, 2960 // don't diagnose. 2961 if (Sel == Sema::AbstractNone) return; 2962 2963 // Check whether the type matches the abstract type. 2964 QualType T = TL.getType(); 2965 if (T->isArrayType()) { 2966 Sel = Sema::AbstractArrayType; 2967 T = Info.S.Context.getBaseElementType(T); 2968 } 2969 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 2970 if (CT != Info.AbstractType) return; 2971 2972 // It matched; do some magic. 2973 if (Sel == Sema::AbstractArrayType) { 2974 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 2975 << T << TL.getSourceRange(); 2976 } else { 2977 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 2978 << Sel << T << TL.getSourceRange(); 2979 } 2980 Info.DiagnoseAbstractType(); 2981 } 2982}; 2983 2984void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 2985 Sema::AbstractDiagSelID Sel) { 2986 CheckAbstractUsage(*this, D).Visit(TL, Sel); 2987} 2988 2989} 2990 2991/// Check for invalid uses of an abstract type in a method declaration. 2992static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 2993 CXXMethodDecl *MD) { 2994 // No need to do the check on definitions, which require that 2995 // the return/param types be complete. 2996 if (MD->doesThisDeclarationHaveABody()) 2997 return; 2998 2999 // For safety's sake, just ignore it if we don't have type source 3000 // information. This should never happen for non-implicit methods, 3001 // but... 3002 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3003 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3004} 3005 3006/// Check for invalid uses of an abstract type within a class definition. 3007static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3008 CXXRecordDecl *RD) { 3009 for (CXXRecordDecl::decl_iterator 3010 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3011 Decl *D = *I; 3012 if (D->isImplicit()) continue; 3013 3014 // Methods and method templates. 3015 if (isa<CXXMethodDecl>(D)) { 3016 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3017 } else if (isa<FunctionTemplateDecl>(D)) { 3018 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3019 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3020 3021 // Fields and static variables. 3022 } else if (isa<FieldDecl>(D)) { 3023 FieldDecl *FD = cast<FieldDecl>(D); 3024 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3025 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3026 } else if (isa<VarDecl>(D)) { 3027 VarDecl *VD = cast<VarDecl>(D); 3028 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3029 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3030 3031 // Nested classes and class templates. 3032 } else if (isa<CXXRecordDecl>(D)) { 3033 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3034 } else if (isa<ClassTemplateDecl>(D)) { 3035 CheckAbstractClassUsage(Info, 3036 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3037 } 3038 } 3039} 3040 3041/// \brief Perform semantic checks on a class definition that has been 3042/// completing, introducing implicitly-declared members, checking for 3043/// abstract types, etc. 3044void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3045 if (!Record) 3046 return; 3047 3048 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3049 AbstractUsageInfo Info(*this, Record); 3050 CheckAbstractClassUsage(Info, Record); 3051 } 3052 3053 // If this is not an aggregate type and has no user-declared constructor, 3054 // complain about any non-static data members of reference or const scalar 3055 // type, since they will never get initializers. 3056 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3057 !Record->isAggregate() && !Record->hasUserDeclaredConstructor()) { 3058 bool Complained = false; 3059 for (RecordDecl::field_iterator F = Record->field_begin(), 3060 FEnd = Record->field_end(); 3061 F != FEnd; ++F) { 3062 if (F->hasInClassInitializer()) 3063 continue; 3064 3065 if (F->getType()->isReferenceType() || 3066 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3067 if (!Complained) { 3068 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3069 << Record->getTagKind() << Record; 3070 Complained = true; 3071 } 3072 3073 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3074 << F->getType()->isReferenceType() 3075 << F->getDeclName(); 3076 } 3077 } 3078 } 3079 3080 if (Record->isDynamicClass() && !Record->isDependentType()) 3081 DynamicClasses.push_back(Record); 3082 3083 if (Record->getIdentifier()) { 3084 // C++ [class.mem]p13: 3085 // If T is the name of a class, then each of the following shall have a 3086 // name different from T: 3087 // - every member of every anonymous union that is a member of class T. 3088 // 3089 // C++ [class.mem]p14: 3090 // In addition, if class T has a user-declared constructor (12.1), every 3091 // non-static data member of class T shall have a name different from T. 3092 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3093 R.first != R.second; ++R.first) { 3094 NamedDecl *D = *R.first; 3095 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3096 isa<IndirectFieldDecl>(D)) { 3097 Diag(D->getLocation(), diag::err_member_name_of_class) 3098 << D->getDeclName(); 3099 break; 3100 } 3101 } 3102 } 3103 3104 // Warn if the class has virtual methods but non-virtual public destructor. 3105 if (Record->isPolymorphic() && !Record->isDependentType()) { 3106 CXXDestructorDecl *dtor = Record->getDestructor(); 3107 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3108 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3109 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3110 } 3111 3112 // See if a method overloads virtual methods in a base 3113 /// class without overriding any. 3114 if (!Record->isDependentType()) { 3115 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3116 MEnd = Record->method_end(); 3117 M != MEnd; ++M) { 3118 if (!(*M)->isStatic()) 3119 DiagnoseHiddenVirtualMethods(Record, *M); 3120 } 3121 } 3122 3123 // Declare inherited constructors. We do this eagerly here because: 3124 // - The standard requires an eager diagnostic for conflicting inherited 3125 // constructors from different classes. 3126 // - The lazy declaration of the other implicit constructors is so as to not 3127 // waste space and performance on classes that are not meant to be 3128 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3129 // have inherited constructors. 3130 DeclareInheritedConstructors(Record); 3131 3132 if (!Record->isDependentType()) 3133 CheckExplicitlyDefaultedMethods(Record); 3134} 3135 3136void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3137 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3138 ME = Record->method_end(); 3139 MI != ME; ++MI) { 3140 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3141 switch (getSpecialMember(*MI)) { 3142 case CXXDefaultConstructor: 3143 CheckExplicitlyDefaultedDefaultConstructor( 3144 cast<CXXConstructorDecl>(*MI)); 3145 break; 3146 3147 case CXXDestructor: 3148 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3149 break; 3150 3151 case CXXCopyConstructor: 3152 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3153 break; 3154 3155 case CXXCopyAssignment: 3156 CheckExplicitlyDefaultedCopyAssignment(*MI); 3157 break; 3158 3159 case CXXMoveConstructor: 3160 case CXXMoveAssignment: 3161 Diag(MI->getLocation(), diag::err_defaulted_move_unsupported); 3162 break; 3163 3164 default: 3165 // FIXME: Do moves once they exist 3166 llvm_unreachable("non-special member explicitly defaulted!"); 3167 } 3168 } 3169 } 3170 3171} 3172 3173void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3174 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3175 3176 // Whether this was the first-declared instance of the constructor. 3177 // This affects whether we implicitly add an exception spec (and, eventually, 3178 // constexpr). It is also ill-formed to explicitly default a constructor such 3179 // that it would be deleted. (C++0x [decl.fct.def.default]) 3180 bool First = CD == CD->getCanonicalDecl(); 3181 3182 bool HadError = false; 3183 if (CD->getNumParams() != 0) { 3184 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3185 << CD->getSourceRange(); 3186 HadError = true; 3187 } 3188 3189 ImplicitExceptionSpecification Spec 3190 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3191 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3192 if (EPI.ExceptionSpecType == EST_Delayed) { 3193 // Exception specification depends on some deferred part of the class. We'll 3194 // try again when the class's definition has been fully processed. 3195 return; 3196 } 3197 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3198 *ExceptionType = Context.getFunctionType( 3199 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3200 3201 if (CtorType->hasExceptionSpec()) { 3202 if (CheckEquivalentExceptionSpec( 3203 PDiag(diag::err_incorrect_defaulted_exception_spec) 3204 << CXXDefaultConstructor, 3205 PDiag(), 3206 ExceptionType, SourceLocation(), 3207 CtorType, CD->getLocation())) { 3208 HadError = true; 3209 } 3210 } else if (First) { 3211 // We set the declaration to have the computed exception spec here. 3212 // We know there are no parameters. 3213 EPI.ExtInfo = CtorType->getExtInfo(); 3214 CD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3215 } 3216 3217 if (HadError) { 3218 CD->setInvalidDecl(); 3219 return; 3220 } 3221 3222 if (ShouldDeleteDefaultConstructor(CD)) { 3223 if (First) { 3224 CD->setDeletedAsWritten(); 3225 } else { 3226 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3227 << CXXDefaultConstructor; 3228 CD->setInvalidDecl(); 3229 } 3230 } 3231} 3232 3233void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3234 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3235 3236 // Whether this was the first-declared instance of the constructor. 3237 bool First = CD == CD->getCanonicalDecl(); 3238 3239 bool HadError = false; 3240 if (CD->getNumParams() != 1) { 3241 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3242 << CD->getSourceRange(); 3243 HadError = true; 3244 } 3245 3246 ImplicitExceptionSpecification Spec(Context); 3247 bool Const; 3248 llvm::tie(Spec, Const) = 3249 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3250 3251 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3252 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3253 *ExceptionType = Context.getFunctionType( 3254 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3255 3256 // Check for parameter type matching. 3257 // This is a copy ctor so we know it's a cv-qualified reference to T. 3258 QualType ArgType = CtorType->getArgType(0); 3259 if (ArgType->getPointeeType().isVolatileQualified()) { 3260 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3261 HadError = true; 3262 } 3263 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3264 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3265 HadError = true; 3266 } 3267 3268 if (CtorType->hasExceptionSpec()) { 3269 if (CheckEquivalentExceptionSpec( 3270 PDiag(diag::err_incorrect_defaulted_exception_spec) 3271 << CXXCopyConstructor, 3272 PDiag(), 3273 ExceptionType, SourceLocation(), 3274 CtorType, CD->getLocation())) { 3275 HadError = true; 3276 } 3277 } else if (First) { 3278 // We set the declaration to have the computed exception spec here. 3279 // We duplicate the one parameter type. 3280 EPI.ExtInfo = CtorType->getExtInfo(); 3281 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3282 } 3283 3284 if (HadError) { 3285 CD->setInvalidDecl(); 3286 return; 3287 } 3288 3289 if (ShouldDeleteCopyConstructor(CD)) { 3290 if (First) { 3291 CD->setDeletedAsWritten(); 3292 } else { 3293 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3294 << CXXCopyConstructor; 3295 CD->setInvalidDecl(); 3296 } 3297 } 3298} 3299 3300void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3301 assert(MD->isExplicitlyDefaulted()); 3302 3303 // Whether this was the first-declared instance of the operator 3304 bool First = MD == MD->getCanonicalDecl(); 3305 3306 bool HadError = false; 3307 if (MD->getNumParams() != 1) { 3308 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3309 << MD->getSourceRange(); 3310 HadError = true; 3311 } 3312 3313 QualType ReturnType = 3314 MD->getType()->getAs<FunctionType>()->getResultType(); 3315 if (!ReturnType->isLValueReferenceType() || 3316 !Context.hasSameType( 3317 Context.getCanonicalType(ReturnType->getPointeeType()), 3318 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3319 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3320 HadError = true; 3321 } 3322 3323 ImplicitExceptionSpecification Spec(Context); 3324 bool Const; 3325 llvm::tie(Spec, Const) = 3326 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 3327 3328 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3329 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 3330 *ExceptionType = Context.getFunctionType( 3331 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3332 3333 QualType ArgType = OperType->getArgType(0); 3334 if (!ArgType->isReferenceType()) { 3335 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 3336 HadError = true; 3337 } else { 3338 if (ArgType->getPointeeType().isVolatileQualified()) { 3339 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 3340 HadError = true; 3341 } 3342 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3343 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 3344 HadError = true; 3345 } 3346 } 3347 3348 if (OperType->getTypeQuals()) { 3349 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 3350 HadError = true; 3351 } 3352 3353 if (OperType->hasExceptionSpec()) { 3354 if (CheckEquivalentExceptionSpec( 3355 PDiag(diag::err_incorrect_defaulted_exception_spec) 3356 << CXXCopyAssignment, 3357 PDiag(), 3358 ExceptionType, SourceLocation(), 3359 OperType, MD->getLocation())) { 3360 HadError = true; 3361 } 3362 } else if (First) { 3363 // We set the declaration to have the computed exception spec here. 3364 // We duplicate the one parameter type. 3365 EPI.RefQualifier = OperType->getRefQualifier(); 3366 EPI.ExtInfo = OperType->getExtInfo(); 3367 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 3368 } 3369 3370 if (HadError) { 3371 MD->setInvalidDecl(); 3372 return; 3373 } 3374 3375 if (ShouldDeleteCopyAssignmentOperator(MD)) { 3376 if (First) { 3377 MD->setDeletedAsWritten(); 3378 } else { 3379 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 3380 << CXXCopyAssignment; 3381 MD->setInvalidDecl(); 3382 } 3383 } 3384} 3385 3386void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 3387 assert(DD->isExplicitlyDefaulted()); 3388 3389 // Whether this was the first-declared instance of the destructor. 3390 bool First = DD == DD->getCanonicalDecl(); 3391 3392 ImplicitExceptionSpecification Spec 3393 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 3394 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3395 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 3396 *ExceptionType = Context.getFunctionType( 3397 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3398 3399 if (DtorType->hasExceptionSpec()) { 3400 if (CheckEquivalentExceptionSpec( 3401 PDiag(diag::err_incorrect_defaulted_exception_spec) 3402 << CXXDestructor, 3403 PDiag(), 3404 ExceptionType, SourceLocation(), 3405 DtorType, DD->getLocation())) { 3406 DD->setInvalidDecl(); 3407 return; 3408 } 3409 } else if (First) { 3410 // We set the declaration to have the computed exception spec here. 3411 // There are no parameters. 3412 EPI.ExtInfo = DtorType->getExtInfo(); 3413 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 3414 } 3415 3416 if (ShouldDeleteDestructor(DD)) { 3417 if (First) { 3418 DD->setDeletedAsWritten(); 3419 } else { 3420 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 3421 << CXXDestructor; 3422 DD->setInvalidDecl(); 3423 } 3424 } 3425} 3426 3427bool Sema::ShouldDeleteDefaultConstructor(CXXConstructorDecl *CD) { 3428 CXXRecordDecl *RD = CD->getParent(); 3429 assert(!RD->isDependentType() && "do deletion after instantiation"); 3430 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3431 return false; 3432 3433 SourceLocation Loc = CD->getLocation(); 3434 3435 // Do access control from the constructor 3436 ContextRAII CtorContext(*this, CD); 3437 3438 bool Union = RD->isUnion(); 3439 bool AllConst = true; 3440 3441 // We do this because we should never actually use an anonymous 3442 // union's constructor. 3443 if (Union && RD->isAnonymousStructOrUnion()) 3444 return false; 3445 3446 // FIXME: We should put some diagnostic logic right into this function. 3447 3448 // C++0x [class.ctor]/5 3449 // A defaulted default constructor for class X is defined as deleted if: 3450 3451 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3452 BE = RD->bases_end(); 3453 BI != BE; ++BI) { 3454 // We'll handle this one later 3455 if (BI->isVirtual()) 3456 continue; 3457 3458 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3459 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3460 3461 // -- any [direct base class] has a type with a destructor that is 3462 // deleted or inaccessible from the defaulted default constructor 3463 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3464 if (BaseDtor->isDeleted()) 3465 return true; 3466 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3467 AR_accessible) 3468 return true; 3469 3470 // -- any [direct base class either] has no default constructor or 3471 // overload resolution as applied to [its] default constructor 3472 // results in an ambiguity or in a function that is deleted or 3473 // inaccessible from the defaulted default constructor 3474 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3475 if (!BaseDefault || BaseDefault->isDeleted()) 3476 return true; 3477 3478 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3479 PDiag()) != AR_accessible) 3480 return true; 3481 } 3482 3483 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3484 BE = RD->vbases_end(); 3485 BI != BE; ++BI) { 3486 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3487 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3488 3489 // -- any [virtual base class] has a type with a destructor that is 3490 // delete or inaccessible from the defaulted default constructor 3491 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3492 if (BaseDtor->isDeleted()) 3493 return true; 3494 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3495 AR_accessible) 3496 return true; 3497 3498 // -- any [virtual base class either] has no default constructor or 3499 // overload resolution as applied to [its] default constructor 3500 // results in an ambiguity or in a function that is deleted or 3501 // inaccessible from the defaulted default constructor 3502 CXXConstructorDecl *BaseDefault = LookupDefaultConstructor(BaseDecl); 3503 if (!BaseDefault || BaseDefault->isDeleted()) 3504 return true; 3505 3506 if (CheckConstructorAccess(Loc, BaseDefault, BaseDefault->getAccess(), 3507 PDiag()) != AR_accessible) 3508 return true; 3509 } 3510 3511 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3512 FE = RD->field_end(); 3513 FI != FE; ++FI) { 3514 if (FI->isInvalidDecl()) 3515 continue; 3516 3517 QualType FieldType = Context.getBaseElementType(FI->getType()); 3518 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3519 3520 // -- any non-static data member with no brace-or-equal-initializer is of 3521 // reference type 3522 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 3523 return true; 3524 3525 // -- X is a union and all its variant members are of const-qualified type 3526 // (or array thereof) 3527 if (Union && !FieldType.isConstQualified()) 3528 AllConst = false; 3529 3530 if (FieldRecord) { 3531 // -- X is a union-like class that has a variant member with a non-trivial 3532 // default constructor 3533 if (Union && !FieldRecord->hasTrivialDefaultConstructor()) 3534 return true; 3535 3536 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3537 if (FieldDtor->isDeleted()) 3538 return true; 3539 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3540 AR_accessible) 3541 return true; 3542 3543 // -- any non-variant non-static data member of const-qualified type (or 3544 // array thereof) with no brace-or-equal-initializer does not have a 3545 // user-provided default constructor 3546 if (FieldType.isConstQualified() && 3547 !FI->hasInClassInitializer() && 3548 !FieldRecord->hasUserProvidedDefaultConstructor()) 3549 return true; 3550 3551 if (!Union && FieldRecord->isUnion() && 3552 FieldRecord->isAnonymousStructOrUnion()) { 3553 // We're okay to reuse AllConst here since we only care about the 3554 // value otherwise if we're in a union. 3555 AllConst = true; 3556 3557 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3558 UE = FieldRecord->field_end(); 3559 UI != UE; ++UI) { 3560 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3561 CXXRecordDecl *UnionFieldRecord = 3562 UnionFieldType->getAsCXXRecordDecl(); 3563 3564 if (!UnionFieldType.isConstQualified()) 3565 AllConst = false; 3566 3567 if (UnionFieldRecord && 3568 !UnionFieldRecord->hasTrivialDefaultConstructor()) 3569 return true; 3570 } 3571 3572 if (AllConst) 3573 return true; 3574 3575 // Don't try to initialize the anonymous union 3576 // This is technically non-conformant, but sanity demands it. 3577 continue; 3578 } 3579 3580 // -- any non-static data member with no brace-or-equal-initializer has 3581 // class type M (or array thereof) and either M has no default 3582 // constructor or overload resolution as applied to M's default 3583 // constructor results in an ambiguity or in a function that is deleted 3584 // or inaccessible from the defaulted default constructor. 3585 if (!FI->hasInClassInitializer()) { 3586 CXXConstructorDecl *FieldDefault = LookupDefaultConstructor(FieldRecord); 3587 if (!FieldDefault || FieldDefault->isDeleted()) 3588 return true; 3589 if (CheckConstructorAccess(Loc, FieldDefault, FieldDefault->getAccess(), 3590 PDiag()) != AR_accessible) 3591 return true; 3592 } 3593 } else if (!Union && FieldType.isConstQualified() && 3594 !FI->hasInClassInitializer()) { 3595 // -- any non-variant non-static data member of const-qualified type (or 3596 // array thereof) with no brace-or-equal-initializer does not have a 3597 // user-provided default constructor 3598 return true; 3599 } 3600 } 3601 3602 if (Union && AllConst) 3603 return true; 3604 3605 return false; 3606} 3607 3608bool Sema::ShouldDeleteCopyConstructor(CXXConstructorDecl *CD) { 3609 CXXRecordDecl *RD = CD->getParent(); 3610 assert(!RD->isDependentType() && "do deletion after instantiation"); 3611 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3612 return false; 3613 3614 SourceLocation Loc = CD->getLocation(); 3615 3616 // Do access control from the constructor 3617 ContextRAII CtorContext(*this, CD); 3618 3619 bool Union = RD->isUnion(); 3620 3621 assert(!CD->getParamDecl(0)->getType()->getPointeeType().isNull() && 3622 "copy assignment arg has no pointee type"); 3623 unsigned ArgQuals = 3624 CD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3625 Qualifiers::Const : 0; 3626 3627 // We do this because we should never actually use an anonymous 3628 // union's constructor. 3629 if (Union && RD->isAnonymousStructOrUnion()) 3630 return false; 3631 3632 // FIXME: We should put some diagnostic logic right into this function. 3633 3634 // C++0x [class.copy]/11 3635 // A defaulted [copy] constructor for class X is defined as delete if X has: 3636 3637 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3638 BE = RD->bases_end(); 3639 BI != BE; ++BI) { 3640 // We'll handle this one later 3641 if (BI->isVirtual()) 3642 continue; 3643 3644 QualType BaseType = BI->getType(); 3645 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3646 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3647 3648 // -- any [direct base class] of a type with a destructor that is deleted or 3649 // inaccessible from the defaulted constructor 3650 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3651 if (BaseDtor->isDeleted()) 3652 return true; 3653 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3654 AR_accessible) 3655 return true; 3656 3657 // -- a [direct base class] B that cannot be [copied] because overload 3658 // resolution, as applied to B's [copy] constructor, results in an 3659 // ambiguity or a function that is deleted or inaccessible from the 3660 // defaulted constructor 3661 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3662 if (!BaseCtor || BaseCtor->isDeleted()) 3663 return true; 3664 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3665 AR_accessible) 3666 return true; 3667 } 3668 3669 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3670 BE = RD->vbases_end(); 3671 BI != BE; ++BI) { 3672 QualType BaseType = BI->getType(); 3673 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3674 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3675 3676 // -- any [virtual base class] of a type with a destructor that is deleted or 3677 // inaccessible from the defaulted constructor 3678 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3679 if (BaseDtor->isDeleted()) 3680 return true; 3681 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3682 AR_accessible) 3683 return true; 3684 3685 // -- a [virtual base class] B that cannot be [copied] because overload 3686 // resolution, as applied to B's [copy] constructor, results in an 3687 // ambiguity or a function that is deleted or inaccessible from the 3688 // defaulted constructor 3689 CXXConstructorDecl *BaseCtor = LookupCopyingConstructor(BaseDecl, ArgQuals); 3690 if (!BaseCtor || BaseCtor->isDeleted()) 3691 return true; 3692 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), PDiag()) != 3693 AR_accessible) 3694 return true; 3695 } 3696 3697 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3698 FE = RD->field_end(); 3699 FI != FE; ++FI) { 3700 QualType FieldType = Context.getBaseElementType(FI->getType()); 3701 3702 // -- for a copy constructor, a non-static data member of rvalue reference 3703 // type 3704 if (FieldType->isRValueReferenceType()) 3705 return true; 3706 3707 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3708 3709 if (FieldRecord) { 3710 // This is an anonymous union 3711 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3712 // Anonymous unions inside unions do not variant members create 3713 if (!Union) { 3714 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3715 UE = FieldRecord->field_end(); 3716 UI != UE; ++UI) { 3717 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3718 CXXRecordDecl *UnionFieldRecord = 3719 UnionFieldType->getAsCXXRecordDecl(); 3720 3721 // -- a variant member with a non-trivial [copy] constructor and X 3722 // is a union-like class 3723 if (UnionFieldRecord && 3724 !UnionFieldRecord->hasTrivialCopyConstructor()) 3725 return true; 3726 } 3727 } 3728 3729 // Don't try to initalize an anonymous union 3730 continue; 3731 } else { 3732 // -- a variant member with a non-trivial [copy] constructor and X is a 3733 // union-like class 3734 if (Union && !FieldRecord->hasTrivialCopyConstructor()) 3735 return true; 3736 3737 // -- any [non-static data member] of a type with a destructor that is 3738 // deleted or inaccessible from the defaulted constructor 3739 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3740 if (FieldDtor->isDeleted()) 3741 return true; 3742 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3743 AR_accessible) 3744 return true; 3745 } 3746 3747 // -- a [non-static data member of class type (or array thereof)] B that 3748 // cannot be [copied] because overload resolution, as applied to B's 3749 // [copy] constructor, results in an ambiguity or a function that is 3750 // deleted or inaccessible from the defaulted constructor 3751 CXXConstructorDecl *FieldCtor = LookupCopyingConstructor(FieldRecord, 3752 ArgQuals); 3753 if (!FieldCtor || FieldCtor->isDeleted()) 3754 return true; 3755 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 3756 PDiag()) != AR_accessible) 3757 return true; 3758 } 3759 } 3760 3761 return false; 3762} 3763 3764bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 3765 CXXRecordDecl *RD = MD->getParent(); 3766 assert(!RD->isDependentType() && "do deletion after instantiation"); 3767 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3768 return false; 3769 3770 SourceLocation Loc = MD->getLocation(); 3771 3772 // Do access control from the constructor 3773 ContextRAII MethodContext(*this, MD); 3774 3775 bool Union = RD->isUnion(); 3776 3777 unsigned ArgQuals = 3778 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 3779 Qualifiers::Const : 0; 3780 3781 // We do this because we should never actually use an anonymous 3782 // union's constructor. 3783 if (Union && RD->isAnonymousStructOrUnion()) 3784 return false; 3785 3786 // FIXME: We should put some diagnostic logic right into this function. 3787 3788 // C++0x [class.copy]/11 3789 // A defaulted [copy] assignment operator for class X is defined as deleted 3790 // if X has: 3791 3792 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3793 BE = RD->bases_end(); 3794 BI != BE; ++BI) { 3795 // We'll handle this one later 3796 if (BI->isVirtual()) 3797 continue; 3798 3799 QualType BaseType = BI->getType(); 3800 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3801 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3802 3803 // -- a [direct base class] B that cannot be [copied] because overload 3804 // resolution, as applied to B's [copy] assignment operator, results in 3805 // an ambiguity or a function that is deleted or inaccessible from the 3806 // assignment operator 3807 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 3808 0); 3809 if (!CopyOper || CopyOper->isDeleted()) 3810 return true; 3811 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3812 return true; 3813 } 3814 3815 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3816 BE = RD->vbases_end(); 3817 BI != BE; ++BI) { 3818 QualType BaseType = BI->getType(); 3819 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 3820 assert(BaseDecl && "base isn't a CXXRecordDecl"); 3821 3822 // -- a [virtual base class] B that cannot be [copied] because overload 3823 // resolution, as applied to B's [copy] assignment operator, results in 3824 // an ambiguity or a function that is deleted or inaccessible from the 3825 // assignment operator 3826 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 3827 0); 3828 if (!CopyOper || CopyOper->isDeleted()) 3829 return true; 3830 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3831 return true; 3832 } 3833 3834 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3835 FE = RD->field_end(); 3836 FI != FE; ++FI) { 3837 QualType FieldType = Context.getBaseElementType(FI->getType()); 3838 3839 // -- a non-static data member of reference type 3840 if (FieldType->isReferenceType()) 3841 return true; 3842 3843 // -- a non-static data member of const non-class type (or array thereof) 3844 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 3845 return true; 3846 3847 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3848 3849 if (FieldRecord) { 3850 // This is an anonymous union 3851 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3852 // Anonymous unions inside unions do not variant members create 3853 if (!Union) { 3854 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3855 UE = FieldRecord->field_end(); 3856 UI != UE; ++UI) { 3857 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 3858 CXXRecordDecl *UnionFieldRecord = 3859 UnionFieldType->getAsCXXRecordDecl(); 3860 3861 // -- a variant member with a non-trivial [copy] assignment operator 3862 // and X is a union-like class 3863 if (UnionFieldRecord && 3864 !UnionFieldRecord->hasTrivialCopyAssignment()) 3865 return true; 3866 } 3867 } 3868 3869 // Don't try to initalize an anonymous union 3870 continue; 3871 // -- a variant member with a non-trivial [copy] assignment operator 3872 // and X is a union-like class 3873 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 3874 return true; 3875 } 3876 3877 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 3878 false, 0); 3879 if (!CopyOper || CopyOper->isDeleted()) 3880 return false; 3881 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 3882 return false; 3883 } 3884 } 3885 3886 return false; 3887} 3888 3889bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 3890 CXXRecordDecl *RD = DD->getParent(); 3891 assert(!RD->isDependentType() && "do deletion after instantiation"); 3892 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 3893 return false; 3894 3895 SourceLocation Loc = DD->getLocation(); 3896 3897 // Do access control from the destructor 3898 ContextRAII CtorContext(*this, DD); 3899 3900 bool Union = RD->isUnion(); 3901 3902 // We do this because we should never actually use an anonymous 3903 // union's destructor. 3904 if (Union && RD->isAnonymousStructOrUnion()) 3905 return false; 3906 3907 // C++0x [class.dtor]p5 3908 // A defaulted destructor for a class X is defined as deleted if: 3909 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 3910 BE = RD->bases_end(); 3911 BI != BE; ++BI) { 3912 // We'll handle this one later 3913 if (BI->isVirtual()) 3914 continue; 3915 3916 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3917 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3918 assert(BaseDtor && "base has no destructor"); 3919 3920 // -- any direct or virtual base class has a deleted destructor or 3921 // a destructor that is inaccessible from the defaulted destructor 3922 if (BaseDtor->isDeleted()) 3923 return true; 3924 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3925 AR_accessible) 3926 return true; 3927 } 3928 3929 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 3930 BE = RD->vbases_end(); 3931 BI != BE; ++BI) { 3932 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 3933 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 3934 assert(BaseDtor && "base has no destructor"); 3935 3936 // -- any direct or virtual base class has a deleted destructor or 3937 // a destructor that is inaccessible from the defaulted destructor 3938 if (BaseDtor->isDeleted()) 3939 return true; 3940 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 3941 AR_accessible) 3942 return true; 3943 } 3944 3945 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 3946 FE = RD->field_end(); 3947 FI != FE; ++FI) { 3948 QualType FieldType = Context.getBaseElementType(FI->getType()); 3949 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 3950 if (FieldRecord) { 3951 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 3952 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 3953 UE = FieldRecord->field_end(); 3954 UI != UE; ++UI) { 3955 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 3956 CXXRecordDecl *UnionFieldRecord = 3957 UnionFieldType->getAsCXXRecordDecl(); 3958 3959 // -- X is a union-like class that has a variant member with a non- 3960 // trivial destructor. 3961 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 3962 return true; 3963 } 3964 // Technically we are supposed to do this next check unconditionally. 3965 // But that makes absolutely no sense. 3966 } else { 3967 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 3968 3969 // -- any of the non-static data members has class type M (or array 3970 // thereof) and M has a deleted destructor or a destructor that is 3971 // inaccessible from the defaulted destructor 3972 if (FieldDtor->isDeleted()) 3973 return true; 3974 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 3975 AR_accessible) 3976 return true; 3977 3978 // -- X is a union-like class that has a variant member with a non- 3979 // trivial destructor. 3980 if (Union && !FieldDtor->isTrivial()) 3981 return true; 3982 } 3983 } 3984 } 3985 3986 if (DD->isVirtual()) { 3987 FunctionDecl *OperatorDelete = 0; 3988 DeclarationName Name = 3989 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 3990 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 3991 false)) 3992 return true; 3993 } 3994 3995 3996 return false; 3997} 3998 3999/// \brief Data used with FindHiddenVirtualMethod 4000namespace { 4001 struct FindHiddenVirtualMethodData { 4002 Sema *S; 4003 CXXMethodDecl *Method; 4004 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4005 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4006 }; 4007} 4008 4009/// \brief Member lookup function that determines whether a given C++ 4010/// method overloads virtual methods in a base class without overriding any, 4011/// to be used with CXXRecordDecl::lookupInBases(). 4012static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4013 CXXBasePath &Path, 4014 void *UserData) { 4015 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4016 4017 FindHiddenVirtualMethodData &Data 4018 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4019 4020 DeclarationName Name = Data.Method->getDeclName(); 4021 assert(Name.getNameKind() == DeclarationName::Identifier); 4022 4023 bool foundSameNameMethod = false; 4024 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4025 for (Path.Decls = BaseRecord->lookup(Name); 4026 Path.Decls.first != Path.Decls.second; 4027 ++Path.Decls.first) { 4028 NamedDecl *D = *Path.Decls.first; 4029 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4030 MD = MD->getCanonicalDecl(); 4031 foundSameNameMethod = true; 4032 // Interested only in hidden virtual methods. 4033 if (!MD->isVirtual()) 4034 continue; 4035 // If the method we are checking overrides a method from its base 4036 // don't warn about the other overloaded methods. 4037 if (!Data.S->IsOverload(Data.Method, MD, false)) 4038 return true; 4039 // Collect the overload only if its hidden. 4040 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4041 overloadedMethods.push_back(MD); 4042 } 4043 } 4044 4045 if (foundSameNameMethod) 4046 Data.OverloadedMethods.append(overloadedMethods.begin(), 4047 overloadedMethods.end()); 4048 return foundSameNameMethod; 4049} 4050 4051/// \brief See if a method overloads virtual methods in a base class without 4052/// overriding any. 4053void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4054 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4055 MD->getLocation()) == Diagnostic::Ignored) 4056 return; 4057 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4058 return; 4059 4060 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4061 /*bool RecordPaths=*/false, 4062 /*bool DetectVirtual=*/false); 4063 FindHiddenVirtualMethodData Data; 4064 Data.Method = MD; 4065 Data.S = this; 4066 4067 // Keep the base methods that were overriden or introduced in the subclass 4068 // by 'using' in a set. A base method not in this set is hidden. 4069 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4070 res.first != res.second; ++res.first) { 4071 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4072 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4073 E = MD->end_overridden_methods(); 4074 I != E; ++I) 4075 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4076 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4077 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4078 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4079 } 4080 4081 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4082 !Data.OverloadedMethods.empty()) { 4083 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4084 << MD << (Data.OverloadedMethods.size() > 1); 4085 4086 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4087 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4088 Diag(overloadedMD->getLocation(), 4089 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4090 } 4091 } 4092} 4093 4094void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4095 Decl *TagDecl, 4096 SourceLocation LBrac, 4097 SourceLocation RBrac, 4098 AttributeList *AttrList) { 4099 if (!TagDecl) 4100 return; 4101 4102 AdjustDeclIfTemplate(TagDecl); 4103 4104 ActOnFields(S, RLoc, TagDecl, 4105 // strict aliasing violation! 4106 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4107 FieldCollector->getCurNumFields(), LBrac, RBrac, AttrList); 4108 4109 CheckCompletedCXXClass( 4110 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4111} 4112 4113/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4114/// special functions, such as the default constructor, copy 4115/// constructor, or destructor, to the given C++ class (C++ 4116/// [special]p1). This routine can only be executed just before the 4117/// definition of the class is complete. 4118void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4119 if (!ClassDecl->hasUserDeclaredConstructor()) 4120 ++ASTContext::NumImplicitDefaultConstructors; 4121 4122 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4123 ++ASTContext::NumImplicitCopyConstructors; 4124 4125 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4126 ++ASTContext::NumImplicitCopyAssignmentOperators; 4127 4128 // If we have a dynamic class, then the copy assignment operator may be 4129 // virtual, so we have to declare it immediately. This ensures that, e.g., 4130 // it shows up in the right place in the vtable and that we diagnose 4131 // problems with the implicit exception specification. 4132 if (ClassDecl->isDynamicClass()) 4133 DeclareImplicitCopyAssignment(ClassDecl); 4134 } 4135 4136 if (!ClassDecl->hasUserDeclaredDestructor()) { 4137 ++ASTContext::NumImplicitDestructors; 4138 4139 // If we have a dynamic class, then the destructor may be virtual, so we 4140 // have to declare the destructor immediately. This ensures that, e.g., it 4141 // shows up in the right place in the vtable and that we diagnose problems 4142 // with the implicit exception specification. 4143 if (ClassDecl->isDynamicClass()) 4144 DeclareImplicitDestructor(ClassDecl); 4145 } 4146} 4147 4148void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4149 if (!D) 4150 return; 4151 4152 int NumParamList = D->getNumTemplateParameterLists(); 4153 for (int i = 0; i < NumParamList; i++) { 4154 TemplateParameterList* Params = D->getTemplateParameterList(i); 4155 for (TemplateParameterList::iterator Param = Params->begin(), 4156 ParamEnd = Params->end(); 4157 Param != ParamEnd; ++Param) { 4158 NamedDecl *Named = cast<NamedDecl>(*Param); 4159 if (Named->getDeclName()) { 4160 S->AddDecl(Named); 4161 IdResolver.AddDecl(Named); 4162 } 4163 } 4164 } 4165} 4166 4167void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4168 if (!D) 4169 return; 4170 4171 TemplateParameterList *Params = 0; 4172 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4173 Params = Template->getTemplateParameters(); 4174 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4175 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4176 Params = PartialSpec->getTemplateParameters(); 4177 else 4178 return; 4179 4180 for (TemplateParameterList::iterator Param = Params->begin(), 4181 ParamEnd = Params->end(); 4182 Param != ParamEnd; ++Param) { 4183 NamedDecl *Named = cast<NamedDecl>(*Param); 4184 if (Named->getDeclName()) { 4185 S->AddDecl(Named); 4186 IdResolver.AddDecl(Named); 4187 } 4188 } 4189} 4190 4191void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4192 if (!RecordD) return; 4193 AdjustDeclIfTemplate(RecordD); 4194 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4195 PushDeclContext(S, Record); 4196} 4197 4198void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4199 if (!RecordD) return; 4200 PopDeclContext(); 4201} 4202 4203/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4204/// parsing a top-level (non-nested) C++ class, and we are now 4205/// parsing those parts of the given Method declaration that could 4206/// not be parsed earlier (C++ [class.mem]p2), such as default 4207/// arguments. This action should enter the scope of the given 4208/// Method declaration as if we had just parsed the qualified method 4209/// name. However, it should not bring the parameters into scope; 4210/// that will be performed by ActOnDelayedCXXMethodParameter. 4211void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4212} 4213 4214/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4215/// C++ method declaration. We're (re-)introducing the given 4216/// function parameter into scope for use in parsing later parts of 4217/// the method declaration. For example, we could see an 4218/// ActOnParamDefaultArgument event for this parameter. 4219void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4220 if (!ParamD) 4221 return; 4222 4223 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4224 4225 // If this parameter has an unparsed default argument, clear it out 4226 // to make way for the parsed default argument. 4227 if (Param->hasUnparsedDefaultArg()) 4228 Param->setDefaultArg(0); 4229 4230 S->AddDecl(Param); 4231 if (Param->getDeclName()) 4232 IdResolver.AddDecl(Param); 4233} 4234 4235/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4236/// processing the delayed method declaration for Method. The method 4237/// declaration is now considered finished. There may be a separate 4238/// ActOnStartOfFunctionDef action later (not necessarily 4239/// immediately!) for this method, if it was also defined inside the 4240/// class body. 4241void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4242 if (!MethodD) 4243 return; 4244 4245 AdjustDeclIfTemplate(MethodD); 4246 4247 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4248 4249 // Now that we have our default arguments, check the constructor 4250 // again. It could produce additional diagnostics or affect whether 4251 // the class has implicitly-declared destructors, among other 4252 // things. 4253 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4254 CheckConstructor(Constructor); 4255 4256 // Check the default arguments, which we may have added. 4257 if (!Method->isInvalidDecl()) 4258 CheckCXXDefaultArguments(Method); 4259} 4260 4261/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4262/// the well-formedness of the constructor declarator @p D with type @p 4263/// R. If there are any errors in the declarator, this routine will 4264/// emit diagnostics and set the invalid bit to true. In any case, the type 4265/// will be updated to reflect a well-formed type for the constructor and 4266/// returned. 4267QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4268 StorageClass &SC) { 4269 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4270 4271 // C++ [class.ctor]p3: 4272 // A constructor shall not be virtual (10.3) or static (9.4). A 4273 // constructor can be invoked for a const, volatile or const 4274 // volatile object. A constructor shall not be declared const, 4275 // volatile, or const volatile (9.3.2). 4276 if (isVirtual) { 4277 if (!D.isInvalidType()) 4278 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4279 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4280 << SourceRange(D.getIdentifierLoc()); 4281 D.setInvalidType(); 4282 } 4283 if (SC == SC_Static) { 4284 if (!D.isInvalidType()) 4285 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4286 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4287 << SourceRange(D.getIdentifierLoc()); 4288 D.setInvalidType(); 4289 SC = SC_None; 4290 } 4291 4292 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4293 if (FTI.TypeQuals != 0) { 4294 if (FTI.TypeQuals & Qualifiers::Const) 4295 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4296 << "const" << SourceRange(D.getIdentifierLoc()); 4297 if (FTI.TypeQuals & Qualifiers::Volatile) 4298 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4299 << "volatile" << SourceRange(D.getIdentifierLoc()); 4300 if (FTI.TypeQuals & Qualifiers::Restrict) 4301 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4302 << "restrict" << SourceRange(D.getIdentifierLoc()); 4303 D.setInvalidType(); 4304 } 4305 4306 // C++0x [class.ctor]p4: 4307 // A constructor shall not be declared with a ref-qualifier. 4308 if (FTI.hasRefQualifier()) { 4309 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4310 << FTI.RefQualifierIsLValueRef 4311 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4312 D.setInvalidType(); 4313 } 4314 4315 // Rebuild the function type "R" without any type qualifiers (in 4316 // case any of the errors above fired) and with "void" as the 4317 // return type, since constructors don't have return types. 4318 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4319 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4320 return R; 4321 4322 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4323 EPI.TypeQuals = 0; 4324 EPI.RefQualifier = RQ_None; 4325 4326 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4327 Proto->getNumArgs(), EPI); 4328} 4329 4330/// CheckConstructor - Checks a fully-formed constructor for 4331/// well-formedness, issuing any diagnostics required. Returns true if 4332/// the constructor declarator is invalid. 4333void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4334 CXXRecordDecl *ClassDecl 4335 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4336 if (!ClassDecl) 4337 return Constructor->setInvalidDecl(); 4338 4339 // C++ [class.copy]p3: 4340 // A declaration of a constructor for a class X is ill-formed if 4341 // its first parameter is of type (optionally cv-qualified) X and 4342 // either there are no other parameters or else all other 4343 // parameters have default arguments. 4344 if (!Constructor->isInvalidDecl() && 4345 ((Constructor->getNumParams() == 1) || 4346 (Constructor->getNumParams() > 1 && 4347 Constructor->getParamDecl(1)->hasDefaultArg())) && 4348 Constructor->getTemplateSpecializationKind() 4349 != TSK_ImplicitInstantiation) { 4350 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4351 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4352 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4353 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4354 const char *ConstRef 4355 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4356 : " const &"; 4357 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4358 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4359 4360 // FIXME: Rather that making the constructor invalid, we should endeavor 4361 // to fix the type. 4362 Constructor->setInvalidDecl(); 4363 } 4364 } 4365} 4366 4367/// CheckDestructor - Checks a fully-formed destructor definition for 4368/// well-formedness, issuing any diagnostics required. Returns true 4369/// on error. 4370bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4371 CXXRecordDecl *RD = Destructor->getParent(); 4372 4373 if (Destructor->isVirtual()) { 4374 SourceLocation Loc; 4375 4376 if (!Destructor->isImplicit()) 4377 Loc = Destructor->getLocation(); 4378 else 4379 Loc = RD->getLocation(); 4380 4381 // If we have a virtual destructor, look up the deallocation function 4382 FunctionDecl *OperatorDelete = 0; 4383 DeclarationName Name = 4384 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4385 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4386 return true; 4387 4388 MarkDeclarationReferenced(Loc, OperatorDelete); 4389 4390 Destructor->setOperatorDelete(OperatorDelete); 4391 } 4392 4393 return false; 4394} 4395 4396static inline bool 4397FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 4398 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4399 FTI.ArgInfo[0].Param && 4400 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 4401} 4402 4403/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 4404/// the well-formednes of the destructor declarator @p D with type @p 4405/// R. If there are any errors in the declarator, this routine will 4406/// emit diagnostics and set the declarator to invalid. Even if this happens, 4407/// will be updated to reflect a well-formed type for the destructor and 4408/// returned. 4409QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 4410 StorageClass& SC) { 4411 // C++ [class.dtor]p1: 4412 // [...] A typedef-name that names a class is a class-name 4413 // (7.1.3); however, a typedef-name that names a class shall not 4414 // be used as the identifier in the declarator for a destructor 4415 // declaration. 4416 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 4417 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 4418 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4419 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 4420 else if (const TemplateSpecializationType *TST = 4421 DeclaratorType->getAs<TemplateSpecializationType>()) 4422 if (TST->isTypeAlias()) 4423 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 4424 << DeclaratorType << 1; 4425 4426 // C++ [class.dtor]p2: 4427 // A destructor is used to destroy objects of its class type. A 4428 // destructor takes no parameters, and no return type can be 4429 // specified for it (not even void). The address of a destructor 4430 // shall not be taken. A destructor shall not be static. A 4431 // destructor can be invoked for a const, volatile or const 4432 // volatile object. A destructor shall not be declared const, 4433 // volatile or const volatile (9.3.2). 4434 if (SC == SC_Static) { 4435 if (!D.isInvalidType()) 4436 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 4437 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4438 << SourceRange(D.getIdentifierLoc()) 4439 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4440 4441 SC = SC_None; 4442 } 4443 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4444 // Destructors don't have return types, but the parser will 4445 // happily parse something like: 4446 // 4447 // class X { 4448 // float ~X(); 4449 // }; 4450 // 4451 // The return type will be eliminated later. 4452 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 4453 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4454 << SourceRange(D.getIdentifierLoc()); 4455 } 4456 4457 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4458 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 4459 if (FTI.TypeQuals & Qualifiers::Const) 4460 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4461 << "const" << SourceRange(D.getIdentifierLoc()); 4462 if (FTI.TypeQuals & Qualifiers::Volatile) 4463 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4464 << "volatile" << SourceRange(D.getIdentifierLoc()); 4465 if (FTI.TypeQuals & Qualifiers::Restrict) 4466 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 4467 << "restrict" << SourceRange(D.getIdentifierLoc()); 4468 D.setInvalidType(); 4469 } 4470 4471 // C++0x [class.dtor]p2: 4472 // A destructor shall not be declared with a ref-qualifier. 4473 if (FTI.hasRefQualifier()) { 4474 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 4475 << FTI.RefQualifierIsLValueRef 4476 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4477 D.setInvalidType(); 4478 } 4479 4480 // Make sure we don't have any parameters. 4481 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 4482 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 4483 4484 // Delete the parameters. 4485 FTI.freeArgs(); 4486 D.setInvalidType(); 4487 } 4488 4489 // Make sure the destructor isn't variadic. 4490 if (FTI.isVariadic) { 4491 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 4492 D.setInvalidType(); 4493 } 4494 4495 // Rebuild the function type "R" without any type qualifiers or 4496 // parameters (in case any of the errors above fired) and with 4497 // "void" as the return type, since destructors don't have return 4498 // types. 4499 if (!D.isInvalidType()) 4500 return R; 4501 4502 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4503 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4504 EPI.Variadic = false; 4505 EPI.TypeQuals = 0; 4506 EPI.RefQualifier = RQ_None; 4507 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 4508} 4509 4510/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 4511/// well-formednes of the conversion function declarator @p D with 4512/// type @p R. If there are any errors in the declarator, this routine 4513/// will emit diagnostics and return true. Otherwise, it will return 4514/// false. Either way, the type @p R will be updated to reflect a 4515/// well-formed type for the conversion operator. 4516void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 4517 StorageClass& SC) { 4518 // C++ [class.conv.fct]p1: 4519 // Neither parameter types nor return type can be specified. The 4520 // type of a conversion function (8.3.5) is "function taking no 4521 // parameter returning conversion-type-id." 4522 if (SC == SC_Static) { 4523 if (!D.isInvalidType()) 4524 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 4525 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4526 << SourceRange(D.getIdentifierLoc()); 4527 D.setInvalidType(); 4528 SC = SC_None; 4529 } 4530 4531 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 4532 4533 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 4534 // Conversion functions don't have return types, but the parser will 4535 // happily parse something like: 4536 // 4537 // class X { 4538 // float operator bool(); 4539 // }; 4540 // 4541 // The return type will be changed later anyway. 4542 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 4543 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4544 << SourceRange(D.getIdentifierLoc()); 4545 D.setInvalidType(); 4546 } 4547 4548 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4549 4550 // Make sure we don't have any parameters. 4551 if (Proto->getNumArgs() > 0) { 4552 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 4553 4554 // Delete the parameters. 4555 D.getFunctionTypeInfo().freeArgs(); 4556 D.setInvalidType(); 4557 } else if (Proto->isVariadic()) { 4558 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 4559 D.setInvalidType(); 4560 } 4561 4562 // Diagnose "&operator bool()" and other such nonsense. This 4563 // is actually a gcc extension which we don't support. 4564 if (Proto->getResultType() != ConvType) { 4565 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 4566 << Proto->getResultType(); 4567 D.setInvalidType(); 4568 ConvType = Proto->getResultType(); 4569 } 4570 4571 // C++ [class.conv.fct]p4: 4572 // The conversion-type-id shall not represent a function type nor 4573 // an array type. 4574 if (ConvType->isArrayType()) { 4575 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 4576 ConvType = Context.getPointerType(ConvType); 4577 D.setInvalidType(); 4578 } else if (ConvType->isFunctionType()) { 4579 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 4580 ConvType = Context.getPointerType(ConvType); 4581 D.setInvalidType(); 4582 } 4583 4584 // Rebuild the function type "R" without any parameters (in case any 4585 // of the errors above fired) and with the conversion type as the 4586 // return type. 4587 if (D.isInvalidType()) 4588 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 4589 4590 // C++0x explicit conversion operators. 4591 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 4592 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4593 diag::warn_explicit_conversion_functions) 4594 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 4595} 4596 4597/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 4598/// the declaration of the given C++ conversion function. This routine 4599/// is responsible for recording the conversion function in the C++ 4600/// class, if possible. 4601Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 4602 assert(Conversion && "Expected to receive a conversion function declaration"); 4603 4604 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 4605 4606 // Make sure we aren't redeclaring the conversion function. 4607 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 4608 4609 // C++ [class.conv.fct]p1: 4610 // [...] A conversion function is never used to convert a 4611 // (possibly cv-qualified) object to the (possibly cv-qualified) 4612 // same object type (or a reference to it), to a (possibly 4613 // cv-qualified) base class of that type (or a reference to it), 4614 // or to (possibly cv-qualified) void. 4615 // FIXME: Suppress this warning if the conversion function ends up being a 4616 // virtual function that overrides a virtual function in a base class. 4617 QualType ClassType 4618 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 4619 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 4620 ConvType = ConvTypeRef->getPointeeType(); 4621 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 4622 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4623 /* Suppress diagnostics for instantiations. */; 4624 else if (ConvType->isRecordType()) { 4625 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 4626 if (ConvType == ClassType) 4627 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 4628 << ClassType; 4629 else if (IsDerivedFrom(ClassType, ConvType)) 4630 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 4631 << ClassType << ConvType; 4632 } else if (ConvType->isVoidType()) { 4633 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 4634 << ClassType << ConvType; 4635 } 4636 4637 if (FunctionTemplateDecl *ConversionTemplate 4638 = Conversion->getDescribedFunctionTemplate()) 4639 return ConversionTemplate; 4640 4641 return Conversion; 4642} 4643 4644//===----------------------------------------------------------------------===// 4645// Namespace Handling 4646//===----------------------------------------------------------------------===// 4647 4648 4649 4650/// ActOnStartNamespaceDef - This is called at the start of a namespace 4651/// definition. 4652Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 4653 SourceLocation InlineLoc, 4654 SourceLocation NamespaceLoc, 4655 SourceLocation IdentLoc, 4656 IdentifierInfo *II, 4657 SourceLocation LBrace, 4658 AttributeList *AttrList) { 4659 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 4660 // For anonymous namespace, take the location of the left brace. 4661 SourceLocation Loc = II ? IdentLoc : LBrace; 4662 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, 4663 StartLoc, Loc, II); 4664 Namespc->setInline(InlineLoc.isValid()); 4665 4666 Scope *DeclRegionScope = NamespcScope->getParent(); 4667 4668 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 4669 4670 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 4671 PushNamespaceVisibilityAttr(Attr); 4672 4673 if (II) { 4674 // C++ [namespace.def]p2: 4675 // The identifier in an original-namespace-definition shall not 4676 // have been previously defined in the declarative region in 4677 // which the original-namespace-definition appears. The 4678 // identifier in an original-namespace-definition is the name of 4679 // the namespace. Subsequently in that declarative region, it is 4680 // treated as an original-namespace-name. 4681 // 4682 // Since namespace names are unique in their scope, and we don't 4683 // look through using directives, just look for any ordinary names. 4684 4685 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 4686 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 4687 Decl::IDNS_Namespace; 4688 NamedDecl *PrevDecl = 0; 4689 for (DeclContext::lookup_result R 4690 = CurContext->getRedeclContext()->lookup(II); 4691 R.first != R.second; ++R.first) { 4692 if ((*R.first)->getIdentifierNamespace() & IDNS) { 4693 PrevDecl = *R.first; 4694 break; 4695 } 4696 } 4697 4698 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 4699 // This is an extended namespace definition. 4700 if (Namespc->isInline() != OrigNS->isInline()) { 4701 // inline-ness must match 4702 if (OrigNS->isInline()) { 4703 // The user probably just forgot the 'inline', so suggest that it 4704 // be added back. 4705 Diag(Namespc->getLocation(), 4706 diag::warn_inline_namespace_reopened_noninline) 4707 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 4708 } else { 4709 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4710 << Namespc->isInline(); 4711 } 4712 Diag(OrigNS->getLocation(), diag::note_previous_definition); 4713 4714 // Recover by ignoring the new namespace's inline status. 4715 Namespc->setInline(OrigNS->isInline()); 4716 } 4717 4718 // Attach this namespace decl to the chain of extended namespace 4719 // definitions. 4720 OrigNS->setNextNamespace(Namespc); 4721 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 4722 4723 // Remove the previous declaration from the scope. 4724 if (DeclRegionScope->isDeclScope(OrigNS)) { 4725 IdResolver.RemoveDecl(OrigNS); 4726 DeclRegionScope->RemoveDecl(OrigNS); 4727 } 4728 } else if (PrevDecl) { 4729 // This is an invalid name redefinition. 4730 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 4731 << Namespc->getDeclName(); 4732 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4733 Namespc->setInvalidDecl(); 4734 // Continue on to push Namespc as current DeclContext and return it. 4735 } else if (II->isStr("std") && 4736 CurContext->getRedeclContext()->isTranslationUnit()) { 4737 // This is the first "real" definition of the namespace "std", so update 4738 // our cache of the "std" namespace to point at this definition. 4739 if (NamespaceDecl *StdNS = getStdNamespace()) { 4740 // We had already defined a dummy namespace "std". Link this new 4741 // namespace definition to the dummy namespace "std". 4742 StdNS->setNextNamespace(Namespc); 4743 StdNS->setLocation(IdentLoc); 4744 Namespc->setOriginalNamespace(StdNS->getOriginalNamespace()); 4745 } 4746 4747 // Make our StdNamespace cache point at the first real definition of the 4748 // "std" namespace. 4749 StdNamespace = Namespc; 4750 4751 // Add this instance of "std" to the set of known namespaces 4752 KnownNamespaces[Namespc] = false; 4753 } else if (!Namespc->isInline()) { 4754 // Since this is an "original" namespace, add it to the known set of 4755 // namespaces if it is not an inline namespace. 4756 KnownNamespaces[Namespc] = false; 4757 } 4758 4759 PushOnScopeChains(Namespc, DeclRegionScope); 4760 } else { 4761 // Anonymous namespaces. 4762 assert(Namespc->isAnonymousNamespace()); 4763 4764 // Link the anonymous namespace into its parent. 4765 NamespaceDecl *PrevDecl; 4766 DeclContext *Parent = CurContext->getRedeclContext(); 4767 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 4768 PrevDecl = TU->getAnonymousNamespace(); 4769 TU->setAnonymousNamespace(Namespc); 4770 } else { 4771 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 4772 PrevDecl = ND->getAnonymousNamespace(); 4773 ND->setAnonymousNamespace(Namespc); 4774 } 4775 4776 // Link the anonymous namespace with its previous declaration. 4777 if (PrevDecl) { 4778 assert(PrevDecl->isAnonymousNamespace()); 4779 assert(!PrevDecl->getNextNamespace()); 4780 Namespc->setOriginalNamespace(PrevDecl->getOriginalNamespace()); 4781 PrevDecl->setNextNamespace(Namespc); 4782 4783 if (Namespc->isInline() != PrevDecl->isInline()) { 4784 // inline-ness must match 4785 Diag(Namespc->getLocation(), diag::err_inline_namespace_mismatch) 4786 << Namespc->isInline(); 4787 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4788 Namespc->setInvalidDecl(); 4789 // Recover by ignoring the new namespace's inline status. 4790 Namespc->setInline(PrevDecl->isInline()); 4791 } 4792 } 4793 4794 CurContext->addDecl(Namespc); 4795 4796 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 4797 // behaves as if it were replaced by 4798 // namespace unique { /* empty body */ } 4799 // using namespace unique; 4800 // namespace unique { namespace-body } 4801 // where all occurrences of 'unique' in a translation unit are 4802 // replaced by the same identifier and this identifier differs 4803 // from all other identifiers in the entire program. 4804 4805 // We just create the namespace with an empty name and then add an 4806 // implicit using declaration, just like the standard suggests. 4807 // 4808 // CodeGen enforces the "universally unique" aspect by giving all 4809 // declarations semantically contained within an anonymous 4810 // namespace internal linkage. 4811 4812 if (!PrevDecl) { 4813 UsingDirectiveDecl* UD 4814 = UsingDirectiveDecl::Create(Context, CurContext, 4815 /* 'using' */ LBrace, 4816 /* 'namespace' */ SourceLocation(), 4817 /* qualifier */ NestedNameSpecifierLoc(), 4818 /* identifier */ SourceLocation(), 4819 Namespc, 4820 /* Ancestor */ CurContext); 4821 UD->setImplicit(); 4822 CurContext->addDecl(UD); 4823 } 4824 } 4825 4826 // Although we could have an invalid decl (i.e. the namespace name is a 4827 // redefinition), push it as current DeclContext and try to continue parsing. 4828 // FIXME: We should be able to push Namespc here, so that the each DeclContext 4829 // for the namespace has the declarations that showed up in that particular 4830 // namespace definition. 4831 PushDeclContext(NamespcScope, Namespc); 4832 return Namespc; 4833} 4834 4835/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 4836/// is a namespace alias, returns the namespace it points to. 4837static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 4838 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 4839 return AD->getNamespace(); 4840 return dyn_cast_or_null<NamespaceDecl>(D); 4841} 4842 4843/// ActOnFinishNamespaceDef - This callback is called after a namespace is 4844/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 4845void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 4846 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 4847 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 4848 Namespc->setRBraceLoc(RBrace); 4849 PopDeclContext(); 4850 if (Namespc->hasAttr<VisibilityAttr>()) 4851 PopPragmaVisibility(); 4852} 4853 4854CXXRecordDecl *Sema::getStdBadAlloc() const { 4855 return cast_or_null<CXXRecordDecl>( 4856 StdBadAlloc.get(Context.getExternalSource())); 4857} 4858 4859NamespaceDecl *Sema::getStdNamespace() const { 4860 return cast_or_null<NamespaceDecl>( 4861 StdNamespace.get(Context.getExternalSource())); 4862} 4863 4864/// \brief Retrieve the special "std" namespace, which may require us to 4865/// implicitly define the namespace. 4866NamespaceDecl *Sema::getOrCreateStdNamespace() { 4867 if (!StdNamespace) { 4868 // The "std" namespace has not yet been defined, so build one implicitly. 4869 StdNamespace = NamespaceDecl::Create(Context, 4870 Context.getTranslationUnitDecl(), 4871 SourceLocation(), SourceLocation(), 4872 &PP.getIdentifierTable().get("std")); 4873 getStdNamespace()->setImplicit(true); 4874 } 4875 4876 return getStdNamespace(); 4877} 4878 4879/// \brief Determine whether a using statement is in a context where it will be 4880/// apply in all contexts. 4881static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 4882 switch (CurContext->getDeclKind()) { 4883 case Decl::TranslationUnit: 4884 return true; 4885 case Decl::LinkageSpec: 4886 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 4887 default: 4888 return false; 4889 } 4890} 4891 4892static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 4893 CXXScopeSpec &SS, 4894 SourceLocation IdentLoc, 4895 IdentifierInfo *Ident) { 4896 R.clear(); 4897 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 4898 R.getLookupKind(), Sc, &SS, NULL, 4899 false, S.CTC_NoKeywords, NULL)) { 4900 if (Corrected.getCorrectionDeclAs<NamespaceDecl>() || 4901 Corrected.getCorrectionDeclAs<NamespaceAliasDecl>()) { 4902 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 4903 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 4904 if (DeclContext *DC = S.computeDeclContext(SS, false)) 4905 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 4906 << Ident << DC << CorrectedQuotedStr << SS.getRange() 4907 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 4908 else 4909 S.Diag(IdentLoc, diag::err_using_directive_suggest) 4910 << Ident << CorrectedQuotedStr 4911 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 4912 4913 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 4914 diag::note_namespace_defined_here) << CorrectedQuotedStr; 4915 4916 Ident = Corrected.getCorrectionAsIdentifierInfo(); 4917 R.addDecl(Corrected.getCorrectionDecl()); 4918 return true; 4919 } 4920 R.setLookupName(Ident); 4921 } 4922 return false; 4923} 4924 4925Decl *Sema::ActOnUsingDirective(Scope *S, 4926 SourceLocation UsingLoc, 4927 SourceLocation NamespcLoc, 4928 CXXScopeSpec &SS, 4929 SourceLocation IdentLoc, 4930 IdentifierInfo *NamespcName, 4931 AttributeList *AttrList) { 4932 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 4933 assert(NamespcName && "Invalid NamespcName."); 4934 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 4935 4936 // This can only happen along a recovery path. 4937 while (S->getFlags() & Scope::TemplateParamScope) 4938 S = S->getParent(); 4939 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 4940 4941 UsingDirectiveDecl *UDir = 0; 4942 NestedNameSpecifier *Qualifier = 0; 4943 if (SS.isSet()) 4944 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4945 4946 // Lookup namespace name. 4947 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 4948 LookupParsedName(R, S, &SS); 4949 if (R.isAmbiguous()) 4950 return 0; 4951 4952 if (R.empty()) { 4953 R.clear(); 4954 // Allow "using namespace std;" or "using namespace ::std;" even if 4955 // "std" hasn't been defined yet, for GCC compatibility. 4956 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 4957 NamespcName->isStr("std")) { 4958 Diag(IdentLoc, diag::ext_using_undefined_std); 4959 R.addDecl(getOrCreateStdNamespace()); 4960 R.resolveKind(); 4961 } 4962 // Otherwise, attempt typo correction. 4963 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 4964 } 4965 4966 if (!R.empty()) { 4967 NamedDecl *Named = R.getFoundDecl(); 4968 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 4969 && "expected namespace decl"); 4970 // C++ [namespace.udir]p1: 4971 // A using-directive specifies that the names in the nominated 4972 // namespace can be used in the scope in which the 4973 // using-directive appears after the using-directive. During 4974 // unqualified name lookup (3.4.1), the names appear as if they 4975 // were declared in the nearest enclosing namespace which 4976 // contains both the using-directive and the nominated 4977 // namespace. [Note: in this context, "contains" means "contains 4978 // directly or indirectly". ] 4979 4980 // Find enclosing context containing both using-directive and 4981 // nominated namespace. 4982 NamespaceDecl *NS = getNamespaceDecl(Named); 4983 DeclContext *CommonAncestor = cast<DeclContext>(NS); 4984 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 4985 CommonAncestor = CommonAncestor->getParent(); 4986 4987 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 4988 SS.getWithLocInContext(Context), 4989 IdentLoc, Named, CommonAncestor); 4990 4991 if (IsUsingDirectiveInToplevelContext(CurContext) && 4992 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 4993 Diag(IdentLoc, diag::warn_using_directive_in_header); 4994 } 4995 4996 PushUsingDirective(S, UDir); 4997 } else { 4998 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 4999 } 5000 5001 // FIXME: We ignore attributes for now. 5002 return UDir; 5003} 5004 5005void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5006 // If scope has associated entity, then using directive is at namespace 5007 // or translation unit scope. We add UsingDirectiveDecls, into 5008 // it's lookup structure. 5009 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5010 Ctx->addDecl(UDir); 5011 else 5012 // Otherwise it is block-sope. using-directives will affect lookup 5013 // only to the end of scope. 5014 S->PushUsingDirective(UDir); 5015} 5016 5017 5018Decl *Sema::ActOnUsingDeclaration(Scope *S, 5019 AccessSpecifier AS, 5020 bool HasUsingKeyword, 5021 SourceLocation UsingLoc, 5022 CXXScopeSpec &SS, 5023 UnqualifiedId &Name, 5024 AttributeList *AttrList, 5025 bool IsTypeName, 5026 SourceLocation TypenameLoc) { 5027 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5028 5029 switch (Name.getKind()) { 5030 case UnqualifiedId::IK_ImplicitSelfParam: 5031 case UnqualifiedId::IK_Identifier: 5032 case UnqualifiedId::IK_OperatorFunctionId: 5033 case UnqualifiedId::IK_LiteralOperatorId: 5034 case UnqualifiedId::IK_ConversionFunctionId: 5035 break; 5036 5037 case UnqualifiedId::IK_ConstructorName: 5038 case UnqualifiedId::IK_ConstructorTemplateId: 5039 // C++0x inherited constructors. 5040 if (getLangOptions().CPlusPlus0x) break; 5041 5042 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_constructor) 5043 << SS.getRange(); 5044 return 0; 5045 5046 case UnqualifiedId::IK_DestructorName: 5047 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5048 << SS.getRange(); 5049 return 0; 5050 5051 case UnqualifiedId::IK_TemplateId: 5052 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5053 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5054 return 0; 5055 } 5056 5057 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5058 DeclarationName TargetName = TargetNameInfo.getName(); 5059 if (!TargetName) 5060 return 0; 5061 5062 // Warn about using declarations. 5063 // TODO: store that the declaration was written without 'using' and 5064 // talk about access decls instead of using decls in the 5065 // diagnostics. 5066 if (!HasUsingKeyword) { 5067 UsingLoc = Name.getSourceRange().getBegin(); 5068 5069 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5070 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5071 } 5072 5073 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5074 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5075 return 0; 5076 5077 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5078 TargetNameInfo, AttrList, 5079 /* IsInstantiation */ false, 5080 IsTypeName, TypenameLoc); 5081 if (UD) 5082 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5083 5084 return UD; 5085} 5086 5087/// \brief Determine whether a using declaration considers the given 5088/// declarations as "equivalent", e.g., if they are redeclarations of 5089/// the same entity or are both typedefs of the same type. 5090static bool 5091IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5092 bool &SuppressRedeclaration) { 5093 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5094 SuppressRedeclaration = false; 5095 return true; 5096 } 5097 5098 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5099 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5100 SuppressRedeclaration = true; 5101 return Context.hasSameType(TD1->getUnderlyingType(), 5102 TD2->getUnderlyingType()); 5103 } 5104 5105 return false; 5106} 5107 5108 5109/// Determines whether to create a using shadow decl for a particular 5110/// decl, given the set of decls existing prior to this using lookup. 5111bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5112 const LookupResult &Previous) { 5113 // Diagnose finding a decl which is not from a base class of the 5114 // current class. We do this now because there are cases where this 5115 // function will silently decide not to build a shadow decl, which 5116 // will pre-empt further diagnostics. 5117 // 5118 // We don't need to do this in C++0x because we do the check once on 5119 // the qualifier. 5120 // 5121 // FIXME: diagnose the following if we care enough: 5122 // struct A { int foo; }; 5123 // struct B : A { using A::foo; }; 5124 // template <class T> struct C : A {}; 5125 // template <class T> struct D : C<T> { using B::foo; } // <--- 5126 // This is invalid (during instantiation) in C++03 because B::foo 5127 // resolves to the using decl in B, which is not a base class of D<T>. 5128 // We can't diagnose it immediately because C<T> is an unknown 5129 // specialization. The UsingShadowDecl in D<T> then points directly 5130 // to A::foo, which will look well-formed when we instantiate. 5131 // The right solution is to not collapse the shadow-decl chain. 5132 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5133 DeclContext *OrigDC = Orig->getDeclContext(); 5134 5135 // Handle enums and anonymous structs. 5136 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5137 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5138 while (OrigRec->isAnonymousStructOrUnion()) 5139 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5140 5141 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5142 if (OrigDC == CurContext) { 5143 Diag(Using->getLocation(), 5144 diag::err_using_decl_nested_name_specifier_is_current_class) 5145 << Using->getQualifierLoc().getSourceRange(); 5146 Diag(Orig->getLocation(), diag::note_using_decl_target); 5147 return true; 5148 } 5149 5150 Diag(Using->getQualifierLoc().getBeginLoc(), 5151 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5152 << Using->getQualifier() 5153 << cast<CXXRecordDecl>(CurContext) 5154 << Using->getQualifierLoc().getSourceRange(); 5155 Diag(Orig->getLocation(), diag::note_using_decl_target); 5156 return true; 5157 } 5158 } 5159 5160 if (Previous.empty()) return false; 5161 5162 NamedDecl *Target = Orig; 5163 if (isa<UsingShadowDecl>(Target)) 5164 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5165 5166 // If the target happens to be one of the previous declarations, we 5167 // don't have a conflict. 5168 // 5169 // FIXME: but we might be increasing its access, in which case we 5170 // should redeclare it. 5171 NamedDecl *NonTag = 0, *Tag = 0; 5172 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5173 I != E; ++I) { 5174 NamedDecl *D = (*I)->getUnderlyingDecl(); 5175 bool Result; 5176 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5177 return Result; 5178 5179 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5180 } 5181 5182 if (Target->isFunctionOrFunctionTemplate()) { 5183 FunctionDecl *FD; 5184 if (isa<FunctionTemplateDecl>(Target)) 5185 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5186 else 5187 FD = cast<FunctionDecl>(Target); 5188 5189 NamedDecl *OldDecl = 0; 5190 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5191 case Ovl_Overload: 5192 return false; 5193 5194 case Ovl_NonFunction: 5195 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5196 break; 5197 5198 // We found a decl with the exact signature. 5199 case Ovl_Match: 5200 // If we're in a record, we want to hide the target, so we 5201 // return true (without a diagnostic) to tell the caller not to 5202 // build a shadow decl. 5203 if (CurContext->isRecord()) 5204 return true; 5205 5206 // If we're not in a record, this is an error. 5207 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5208 break; 5209 } 5210 5211 Diag(Target->getLocation(), diag::note_using_decl_target); 5212 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5213 return true; 5214 } 5215 5216 // Target is not a function. 5217 5218 if (isa<TagDecl>(Target)) { 5219 // No conflict between a tag and a non-tag. 5220 if (!Tag) return false; 5221 5222 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5223 Diag(Target->getLocation(), diag::note_using_decl_target); 5224 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5225 return true; 5226 } 5227 5228 // No conflict between a tag and a non-tag. 5229 if (!NonTag) return false; 5230 5231 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5232 Diag(Target->getLocation(), diag::note_using_decl_target); 5233 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5234 return true; 5235} 5236 5237/// Builds a shadow declaration corresponding to a 'using' declaration. 5238UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5239 UsingDecl *UD, 5240 NamedDecl *Orig) { 5241 5242 // If we resolved to another shadow declaration, just coalesce them. 5243 NamedDecl *Target = Orig; 5244 if (isa<UsingShadowDecl>(Target)) { 5245 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5246 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5247 } 5248 5249 UsingShadowDecl *Shadow 5250 = UsingShadowDecl::Create(Context, CurContext, 5251 UD->getLocation(), UD, Target); 5252 UD->addShadowDecl(Shadow); 5253 5254 Shadow->setAccess(UD->getAccess()); 5255 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5256 Shadow->setInvalidDecl(); 5257 5258 if (S) 5259 PushOnScopeChains(Shadow, S); 5260 else 5261 CurContext->addDecl(Shadow); 5262 5263 5264 return Shadow; 5265} 5266 5267/// Hides a using shadow declaration. This is required by the current 5268/// using-decl implementation when a resolvable using declaration in a 5269/// class is followed by a declaration which would hide or override 5270/// one or more of the using decl's targets; for example: 5271/// 5272/// struct Base { void foo(int); }; 5273/// struct Derived : Base { 5274/// using Base::foo; 5275/// void foo(int); 5276/// }; 5277/// 5278/// The governing language is C++03 [namespace.udecl]p12: 5279/// 5280/// When a using-declaration brings names from a base class into a 5281/// derived class scope, member functions in the derived class 5282/// override and/or hide member functions with the same name and 5283/// parameter types in a base class (rather than conflicting). 5284/// 5285/// There are two ways to implement this: 5286/// (1) optimistically create shadow decls when they're not hidden 5287/// by existing declarations, or 5288/// (2) don't create any shadow decls (or at least don't make them 5289/// visible) until we've fully parsed/instantiated the class. 5290/// The problem with (1) is that we might have to retroactively remove 5291/// a shadow decl, which requires several O(n) operations because the 5292/// decl structures are (very reasonably) not designed for removal. 5293/// (2) avoids this but is very fiddly and phase-dependent. 5294void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 5295 if (Shadow->getDeclName().getNameKind() == 5296 DeclarationName::CXXConversionFunctionName) 5297 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 5298 5299 // Remove it from the DeclContext... 5300 Shadow->getDeclContext()->removeDecl(Shadow); 5301 5302 // ...and the scope, if applicable... 5303 if (S) { 5304 S->RemoveDecl(Shadow); 5305 IdResolver.RemoveDecl(Shadow); 5306 } 5307 5308 // ...and the using decl. 5309 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 5310 5311 // TODO: complain somehow if Shadow was used. It shouldn't 5312 // be possible for this to happen, because...? 5313} 5314 5315/// Builds a using declaration. 5316/// 5317/// \param IsInstantiation - Whether this call arises from an 5318/// instantiation of an unresolved using declaration. We treat 5319/// the lookup differently for these declarations. 5320NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 5321 SourceLocation UsingLoc, 5322 CXXScopeSpec &SS, 5323 const DeclarationNameInfo &NameInfo, 5324 AttributeList *AttrList, 5325 bool IsInstantiation, 5326 bool IsTypeName, 5327 SourceLocation TypenameLoc) { 5328 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5329 SourceLocation IdentLoc = NameInfo.getLoc(); 5330 assert(IdentLoc.isValid() && "Invalid TargetName location."); 5331 5332 // FIXME: We ignore attributes for now. 5333 5334 if (SS.isEmpty()) { 5335 Diag(IdentLoc, diag::err_using_requires_qualname); 5336 return 0; 5337 } 5338 5339 // Do the redeclaration lookup in the current scope. 5340 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 5341 ForRedeclaration); 5342 Previous.setHideTags(false); 5343 if (S) { 5344 LookupName(Previous, S); 5345 5346 // It is really dumb that we have to do this. 5347 LookupResult::Filter F = Previous.makeFilter(); 5348 while (F.hasNext()) { 5349 NamedDecl *D = F.next(); 5350 if (!isDeclInScope(D, CurContext, S)) 5351 F.erase(); 5352 } 5353 F.done(); 5354 } else { 5355 assert(IsInstantiation && "no scope in non-instantiation"); 5356 assert(CurContext->isRecord() && "scope not record in instantiation"); 5357 LookupQualifiedName(Previous, CurContext); 5358 } 5359 5360 // Check for invalid redeclarations. 5361 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 5362 return 0; 5363 5364 // Check for bad qualifiers. 5365 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 5366 return 0; 5367 5368 DeclContext *LookupContext = computeDeclContext(SS); 5369 NamedDecl *D; 5370 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 5371 if (!LookupContext) { 5372 if (IsTypeName) { 5373 // FIXME: not all declaration name kinds are legal here 5374 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 5375 UsingLoc, TypenameLoc, 5376 QualifierLoc, 5377 IdentLoc, NameInfo.getName()); 5378 } else { 5379 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 5380 QualifierLoc, NameInfo); 5381 } 5382 } else { 5383 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 5384 NameInfo, IsTypeName); 5385 } 5386 D->setAccess(AS); 5387 CurContext->addDecl(D); 5388 5389 if (!LookupContext) return D; 5390 UsingDecl *UD = cast<UsingDecl>(D); 5391 5392 if (RequireCompleteDeclContext(SS, LookupContext)) { 5393 UD->setInvalidDecl(); 5394 return UD; 5395 } 5396 5397 // Constructor inheriting using decls get special treatment. 5398 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 5399 if (CheckInheritedConstructorUsingDecl(UD)) 5400 UD->setInvalidDecl(); 5401 return UD; 5402 } 5403 5404 // Otherwise, look up the target name. 5405 5406 LookupResult R(*this, NameInfo, LookupOrdinaryName); 5407 R.setUsingDeclaration(true); 5408 5409 // Unlike most lookups, we don't always want to hide tag 5410 // declarations: tag names are visible through the using declaration 5411 // even if hidden by ordinary names, *except* in a dependent context 5412 // where it's important for the sanity of two-phase lookup. 5413 if (!IsInstantiation) 5414 R.setHideTags(false); 5415 5416 LookupQualifiedName(R, LookupContext); 5417 5418 if (R.empty()) { 5419 Diag(IdentLoc, diag::err_no_member) 5420 << NameInfo.getName() << LookupContext << SS.getRange(); 5421 UD->setInvalidDecl(); 5422 return UD; 5423 } 5424 5425 if (R.isAmbiguous()) { 5426 UD->setInvalidDecl(); 5427 return UD; 5428 } 5429 5430 if (IsTypeName) { 5431 // If we asked for a typename and got a non-type decl, error out. 5432 if (!R.getAsSingle<TypeDecl>()) { 5433 Diag(IdentLoc, diag::err_using_typename_non_type); 5434 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 5435 Diag((*I)->getUnderlyingDecl()->getLocation(), 5436 diag::note_using_decl_target); 5437 UD->setInvalidDecl(); 5438 return UD; 5439 } 5440 } else { 5441 // If we asked for a non-typename and we got a type, error out, 5442 // but only if this is an instantiation of an unresolved using 5443 // decl. Otherwise just silently find the type name. 5444 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 5445 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 5446 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 5447 UD->setInvalidDecl(); 5448 return UD; 5449 } 5450 } 5451 5452 // C++0x N2914 [namespace.udecl]p6: 5453 // A using-declaration shall not name a namespace. 5454 if (R.getAsSingle<NamespaceDecl>()) { 5455 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 5456 << SS.getRange(); 5457 UD->setInvalidDecl(); 5458 return UD; 5459 } 5460 5461 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 5462 if (!CheckUsingShadowDecl(UD, *I, Previous)) 5463 BuildUsingShadowDecl(S, UD, *I); 5464 } 5465 5466 return UD; 5467} 5468 5469/// Additional checks for a using declaration referring to a constructor name. 5470bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 5471 if (UD->isTypeName()) { 5472 // FIXME: Cannot specify typename when specifying constructor 5473 return true; 5474 } 5475 5476 const Type *SourceType = UD->getQualifier()->getAsType(); 5477 assert(SourceType && 5478 "Using decl naming constructor doesn't have type in scope spec."); 5479 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 5480 5481 // Check whether the named type is a direct base class. 5482 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 5483 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 5484 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 5485 BaseIt != BaseE; ++BaseIt) { 5486 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 5487 if (CanonicalSourceType == BaseType) 5488 break; 5489 } 5490 5491 if (BaseIt == BaseE) { 5492 // Did not find SourceType in the bases. 5493 Diag(UD->getUsingLocation(), 5494 diag::err_using_decl_constructor_not_in_direct_base) 5495 << UD->getNameInfo().getSourceRange() 5496 << QualType(SourceType, 0) << TargetClass; 5497 return true; 5498 } 5499 5500 BaseIt->setInheritConstructors(); 5501 5502 return false; 5503} 5504 5505/// Checks that the given using declaration is not an invalid 5506/// redeclaration. Note that this is checking only for the using decl 5507/// itself, not for any ill-formedness among the UsingShadowDecls. 5508bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 5509 bool isTypeName, 5510 const CXXScopeSpec &SS, 5511 SourceLocation NameLoc, 5512 const LookupResult &Prev) { 5513 // C++03 [namespace.udecl]p8: 5514 // C++0x [namespace.udecl]p10: 5515 // A using-declaration is a declaration and can therefore be used 5516 // repeatedly where (and only where) multiple declarations are 5517 // allowed. 5518 // 5519 // That's in non-member contexts. 5520 if (!CurContext->getRedeclContext()->isRecord()) 5521 return false; 5522 5523 NestedNameSpecifier *Qual 5524 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5525 5526 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 5527 NamedDecl *D = *I; 5528 5529 bool DTypename; 5530 NestedNameSpecifier *DQual; 5531 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 5532 DTypename = UD->isTypeName(); 5533 DQual = UD->getQualifier(); 5534 } else if (UnresolvedUsingValueDecl *UD 5535 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 5536 DTypename = false; 5537 DQual = UD->getQualifier(); 5538 } else if (UnresolvedUsingTypenameDecl *UD 5539 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 5540 DTypename = true; 5541 DQual = UD->getQualifier(); 5542 } else continue; 5543 5544 // using decls differ if one says 'typename' and the other doesn't. 5545 // FIXME: non-dependent using decls? 5546 if (isTypeName != DTypename) continue; 5547 5548 // using decls differ if they name different scopes (but note that 5549 // template instantiation can cause this check to trigger when it 5550 // didn't before instantiation). 5551 if (Context.getCanonicalNestedNameSpecifier(Qual) != 5552 Context.getCanonicalNestedNameSpecifier(DQual)) 5553 continue; 5554 5555 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 5556 Diag(D->getLocation(), diag::note_using_decl) << 1; 5557 return true; 5558 } 5559 5560 return false; 5561} 5562 5563 5564/// Checks that the given nested-name qualifier used in a using decl 5565/// in the current context is appropriately related to the current 5566/// scope. If an error is found, diagnoses it and returns true. 5567bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 5568 const CXXScopeSpec &SS, 5569 SourceLocation NameLoc) { 5570 DeclContext *NamedContext = computeDeclContext(SS); 5571 5572 if (!CurContext->isRecord()) { 5573 // C++03 [namespace.udecl]p3: 5574 // C++0x [namespace.udecl]p8: 5575 // A using-declaration for a class member shall be a member-declaration. 5576 5577 // If we weren't able to compute a valid scope, it must be a 5578 // dependent class scope. 5579 if (!NamedContext || NamedContext->isRecord()) { 5580 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 5581 << SS.getRange(); 5582 return true; 5583 } 5584 5585 // Otherwise, everything is known to be fine. 5586 return false; 5587 } 5588 5589 // The current scope is a record. 5590 5591 // If the named context is dependent, we can't decide much. 5592 if (!NamedContext) { 5593 // FIXME: in C++0x, we can diagnose if we can prove that the 5594 // nested-name-specifier does not refer to a base class, which is 5595 // still possible in some cases. 5596 5597 // Otherwise we have to conservatively report that things might be 5598 // okay. 5599 return false; 5600 } 5601 5602 if (!NamedContext->isRecord()) { 5603 // Ideally this would point at the last name in the specifier, 5604 // but we don't have that level of source info. 5605 Diag(SS.getRange().getBegin(), 5606 diag::err_using_decl_nested_name_specifier_is_not_class) 5607 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 5608 return true; 5609 } 5610 5611 if (!NamedContext->isDependentContext() && 5612 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 5613 return true; 5614 5615 if (getLangOptions().CPlusPlus0x) { 5616 // C++0x [namespace.udecl]p3: 5617 // In a using-declaration used as a member-declaration, the 5618 // nested-name-specifier shall name a base class of the class 5619 // being defined. 5620 5621 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 5622 cast<CXXRecordDecl>(NamedContext))) { 5623 if (CurContext == NamedContext) { 5624 Diag(NameLoc, 5625 diag::err_using_decl_nested_name_specifier_is_current_class) 5626 << SS.getRange(); 5627 return true; 5628 } 5629 5630 Diag(SS.getRange().getBegin(), 5631 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5632 << (NestedNameSpecifier*) SS.getScopeRep() 5633 << cast<CXXRecordDecl>(CurContext) 5634 << SS.getRange(); 5635 return true; 5636 } 5637 5638 return false; 5639 } 5640 5641 // C++03 [namespace.udecl]p4: 5642 // A using-declaration used as a member-declaration shall refer 5643 // to a member of a base class of the class being defined [etc.]. 5644 5645 // Salient point: SS doesn't have to name a base class as long as 5646 // lookup only finds members from base classes. Therefore we can 5647 // diagnose here only if we can prove that that can't happen, 5648 // i.e. if the class hierarchies provably don't intersect. 5649 5650 // TODO: it would be nice if "definitely valid" results were cached 5651 // in the UsingDecl and UsingShadowDecl so that these checks didn't 5652 // need to be repeated. 5653 5654 struct UserData { 5655 llvm::DenseSet<const CXXRecordDecl*> Bases; 5656 5657 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 5658 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5659 Data->Bases.insert(Base); 5660 return true; 5661 } 5662 5663 bool hasDependentBases(const CXXRecordDecl *Class) { 5664 return !Class->forallBases(collect, this); 5665 } 5666 5667 /// Returns true if the base is dependent or is one of the 5668 /// accumulated base classes. 5669 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 5670 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 5671 return !Data->Bases.count(Base); 5672 } 5673 5674 bool mightShareBases(const CXXRecordDecl *Class) { 5675 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 5676 } 5677 }; 5678 5679 UserData Data; 5680 5681 // Returns false if we find a dependent base. 5682 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 5683 return false; 5684 5685 // Returns false if the class has a dependent base or if it or one 5686 // of its bases is present in the base set of the current context. 5687 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 5688 return false; 5689 5690 Diag(SS.getRange().getBegin(), 5691 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5692 << (NestedNameSpecifier*) SS.getScopeRep() 5693 << cast<CXXRecordDecl>(CurContext) 5694 << SS.getRange(); 5695 5696 return true; 5697} 5698 5699Decl *Sema::ActOnAliasDeclaration(Scope *S, 5700 AccessSpecifier AS, 5701 MultiTemplateParamsArg TemplateParamLists, 5702 SourceLocation UsingLoc, 5703 UnqualifiedId &Name, 5704 TypeResult Type) { 5705 // Skip up to the relevant declaration scope. 5706 while (S->getFlags() & Scope::TemplateParamScope) 5707 S = S->getParent(); 5708 assert((S->getFlags() & Scope::DeclScope) && 5709 "got alias-declaration outside of declaration scope"); 5710 5711 if (Type.isInvalid()) 5712 return 0; 5713 5714 bool Invalid = false; 5715 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 5716 TypeSourceInfo *TInfo = 0; 5717 GetTypeFromParser(Type.get(), &TInfo); 5718 5719 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 5720 return 0; 5721 5722 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 5723 UPPC_DeclarationType)) { 5724 Invalid = true; 5725 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 5726 TInfo->getTypeLoc().getBeginLoc()); 5727 } 5728 5729 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 5730 LookupName(Previous, S); 5731 5732 // Warn about shadowing the name of a template parameter. 5733 if (Previous.isSingleResult() && 5734 Previous.getFoundDecl()->isTemplateParameter()) { 5735 if (DiagnoseTemplateParameterShadow(Name.StartLocation, 5736 Previous.getFoundDecl())) 5737 Invalid = true; 5738 Previous.clear(); 5739 } 5740 5741 assert(Name.Kind == UnqualifiedId::IK_Identifier && 5742 "name in alias declaration must be an identifier"); 5743 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 5744 Name.StartLocation, 5745 Name.Identifier, TInfo); 5746 5747 NewTD->setAccess(AS); 5748 5749 if (Invalid) 5750 NewTD->setInvalidDecl(); 5751 5752 CheckTypedefForVariablyModifiedType(S, NewTD); 5753 Invalid |= NewTD->isInvalidDecl(); 5754 5755 bool Redeclaration = false; 5756 5757 NamedDecl *NewND; 5758 if (TemplateParamLists.size()) { 5759 TypeAliasTemplateDecl *OldDecl = 0; 5760 TemplateParameterList *OldTemplateParams = 0; 5761 5762 if (TemplateParamLists.size() != 1) { 5763 Diag(UsingLoc, diag::err_alias_template_extra_headers) 5764 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 5765 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 5766 } 5767 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 5768 5769 // Only consider previous declarations in the same scope. 5770 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 5771 /*ExplicitInstantiationOrSpecialization*/false); 5772 if (!Previous.empty()) { 5773 Redeclaration = true; 5774 5775 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 5776 if (!OldDecl && !Invalid) { 5777 Diag(UsingLoc, diag::err_redefinition_different_kind) 5778 << Name.Identifier; 5779 5780 NamedDecl *OldD = Previous.getRepresentativeDecl(); 5781 if (OldD->getLocation().isValid()) 5782 Diag(OldD->getLocation(), diag::note_previous_definition); 5783 5784 Invalid = true; 5785 } 5786 5787 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 5788 if (TemplateParameterListsAreEqual(TemplateParams, 5789 OldDecl->getTemplateParameters(), 5790 /*Complain=*/true, 5791 TPL_TemplateMatch)) 5792 OldTemplateParams = OldDecl->getTemplateParameters(); 5793 else 5794 Invalid = true; 5795 5796 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 5797 if (!Invalid && 5798 !Context.hasSameType(OldTD->getUnderlyingType(), 5799 NewTD->getUnderlyingType())) { 5800 // FIXME: The C++0x standard does not clearly say this is ill-formed, 5801 // but we can't reasonably accept it. 5802 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 5803 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 5804 if (OldTD->getLocation().isValid()) 5805 Diag(OldTD->getLocation(), diag::note_previous_definition); 5806 Invalid = true; 5807 } 5808 } 5809 } 5810 5811 // Merge any previous default template arguments into our parameters, 5812 // and check the parameter list. 5813 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 5814 TPC_TypeAliasTemplate)) 5815 return 0; 5816 5817 TypeAliasTemplateDecl *NewDecl = 5818 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 5819 Name.Identifier, TemplateParams, 5820 NewTD); 5821 5822 NewDecl->setAccess(AS); 5823 5824 if (Invalid) 5825 NewDecl->setInvalidDecl(); 5826 else if (OldDecl) 5827 NewDecl->setPreviousDeclaration(OldDecl); 5828 5829 NewND = NewDecl; 5830 } else { 5831 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 5832 NewND = NewTD; 5833 } 5834 5835 if (!Redeclaration) 5836 PushOnScopeChains(NewND, S); 5837 5838 return NewND; 5839} 5840 5841Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 5842 SourceLocation NamespaceLoc, 5843 SourceLocation AliasLoc, 5844 IdentifierInfo *Alias, 5845 CXXScopeSpec &SS, 5846 SourceLocation IdentLoc, 5847 IdentifierInfo *Ident) { 5848 5849 // Lookup the namespace name. 5850 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 5851 LookupParsedName(R, S, &SS); 5852 5853 // Check if we have a previous declaration with the same name. 5854 NamedDecl *PrevDecl 5855 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 5856 ForRedeclaration); 5857 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 5858 PrevDecl = 0; 5859 5860 if (PrevDecl) { 5861 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 5862 // We already have an alias with the same name that points to the same 5863 // namespace, so don't create a new one. 5864 // FIXME: At some point, we'll want to create the (redundant) 5865 // declaration to maintain better source information. 5866 if (!R.isAmbiguous() && !R.empty() && 5867 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 5868 return 0; 5869 } 5870 5871 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 5872 diag::err_redefinition_different_kind; 5873 Diag(AliasLoc, DiagID) << Alias; 5874 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5875 return 0; 5876 } 5877 5878 if (R.isAmbiguous()) 5879 return 0; 5880 5881 if (R.empty()) { 5882 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 5883 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 5884 return 0; 5885 } 5886 } 5887 5888 NamespaceAliasDecl *AliasDecl = 5889 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 5890 Alias, SS.getWithLocInContext(Context), 5891 IdentLoc, R.getFoundDecl()); 5892 5893 PushOnScopeChains(AliasDecl, S); 5894 return AliasDecl; 5895} 5896 5897namespace { 5898 /// \brief Scoped object used to handle the state changes required in Sema 5899 /// to implicitly define the body of a C++ member function; 5900 class ImplicitlyDefinedFunctionScope { 5901 Sema &S; 5902 Sema::ContextRAII SavedContext; 5903 5904 public: 5905 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 5906 : S(S), SavedContext(S, Method) 5907 { 5908 S.PushFunctionScope(); 5909 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 5910 } 5911 5912 ~ImplicitlyDefinedFunctionScope() { 5913 S.PopExpressionEvaluationContext(); 5914 S.PopFunctionOrBlockScope(); 5915 } 5916 }; 5917} 5918 5919Sema::ImplicitExceptionSpecification 5920Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 5921 // C++ [except.spec]p14: 5922 // An implicitly declared special member function (Clause 12) shall have an 5923 // exception-specification. [...] 5924 ImplicitExceptionSpecification ExceptSpec(Context); 5925 if (ClassDecl->isInvalidDecl()) 5926 return ExceptSpec; 5927 5928 // Direct base-class constructors. 5929 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 5930 BEnd = ClassDecl->bases_end(); 5931 B != BEnd; ++B) { 5932 if (B->isVirtual()) // Handled below. 5933 continue; 5934 5935 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5936 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5937 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5938 // If this is a deleted function, add it anyway. This might be conformant 5939 // with the standard. This might not. I'm not sure. It might not matter. 5940 if (Constructor) 5941 ExceptSpec.CalledDecl(Constructor); 5942 } 5943 } 5944 5945 // Virtual base-class constructors. 5946 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 5947 BEnd = ClassDecl->vbases_end(); 5948 B != BEnd; ++B) { 5949 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 5950 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 5951 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 5952 // If this is a deleted function, add it anyway. This might be conformant 5953 // with the standard. This might not. I'm not sure. It might not matter. 5954 if (Constructor) 5955 ExceptSpec.CalledDecl(Constructor); 5956 } 5957 } 5958 5959 // Field constructors. 5960 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 5961 FEnd = ClassDecl->field_end(); 5962 F != FEnd; ++F) { 5963 if (F->hasInClassInitializer()) { 5964 if (Expr *E = F->getInClassInitializer()) 5965 ExceptSpec.CalledExpr(E); 5966 else if (!F->isInvalidDecl()) 5967 ExceptSpec.SetDelayed(); 5968 } else if (const RecordType *RecordTy 5969 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 5970 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 5971 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 5972 // If this is a deleted function, add it anyway. This might be conformant 5973 // with the standard. This might not. I'm not sure. It might not matter. 5974 // In particular, the problem is that this function never gets called. It 5975 // might just be ill-formed because this function attempts to refer to 5976 // a deleted function here. 5977 if (Constructor) 5978 ExceptSpec.CalledDecl(Constructor); 5979 } 5980 } 5981 5982 return ExceptSpec; 5983} 5984 5985CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 5986 CXXRecordDecl *ClassDecl) { 5987 // C++ [class.ctor]p5: 5988 // A default constructor for a class X is a constructor of class X 5989 // that can be called without an argument. If there is no 5990 // user-declared constructor for class X, a default constructor is 5991 // implicitly declared. An implicitly-declared default constructor 5992 // is an inline public member of its class. 5993 assert(!ClassDecl->hasUserDeclaredConstructor() && 5994 "Should not build implicit default constructor!"); 5995 5996 ImplicitExceptionSpecification Spec = 5997 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 5998 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 5999 6000 // Create the actual constructor declaration. 6001 CanQualType ClassType 6002 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6003 SourceLocation ClassLoc = ClassDecl->getLocation(); 6004 DeclarationName Name 6005 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6006 DeclarationNameInfo NameInfo(Name, ClassLoc); 6007 CXXConstructorDecl *DefaultCon 6008 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6009 Context.getFunctionType(Context.VoidTy, 6010 0, 0, EPI), 6011 /*TInfo=*/0, 6012 /*isExplicit=*/false, 6013 /*isInline=*/true, 6014 /*isImplicitlyDeclared=*/true); 6015 DefaultCon->setAccess(AS_public); 6016 DefaultCon->setDefaulted(); 6017 DefaultCon->setImplicit(); 6018 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6019 6020 // Note that we have declared this constructor. 6021 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6022 6023 if (Scope *S = getScopeForContext(ClassDecl)) 6024 PushOnScopeChains(DefaultCon, S, false); 6025 ClassDecl->addDecl(DefaultCon); 6026 6027 if (ShouldDeleteDefaultConstructor(DefaultCon)) 6028 DefaultCon->setDeletedAsWritten(); 6029 6030 return DefaultCon; 6031} 6032 6033void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6034 CXXConstructorDecl *Constructor) { 6035 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6036 !Constructor->doesThisDeclarationHaveABody() && 6037 !Constructor->isDeleted()) && 6038 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6039 6040 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6041 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6042 6043 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6044 DiagnosticErrorTrap Trap(Diags); 6045 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6046 Trap.hasErrorOccurred()) { 6047 Diag(CurrentLocation, diag::note_member_synthesized_at) 6048 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6049 Constructor->setInvalidDecl(); 6050 return; 6051 } 6052 6053 SourceLocation Loc = Constructor->getLocation(); 6054 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6055 6056 Constructor->setUsed(); 6057 MarkVTableUsed(CurrentLocation, ClassDecl); 6058 6059 if (ASTMutationListener *L = getASTMutationListener()) { 6060 L->CompletedImplicitDefinition(Constructor); 6061 } 6062} 6063 6064/// Get any existing defaulted default constructor for the given class. Do not 6065/// implicitly define one if it does not exist. 6066static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6067 CXXRecordDecl *D) { 6068 ASTContext &Context = Self.Context; 6069 QualType ClassType = Context.getTypeDeclType(D); 6070 DeclarationName ConstructorName 6071 = Context.DeclarationNames.getCXXConstructorName( 6072 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6073 6074 DeclContext::lookup_const_iterator Con, ConEnd; 6075 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6076 Con != ConEnd; ++Con) { 6077 // A function template cannot be defaulted. 6078 if (isa<FunctionTemplateDecl>(*Con)) 6079 continue; 6080 6081 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6082 if (Constructor->isDefaultConstructor()) 6083 return Constructor->isDefaulted() ? Constructor : 0; 6084 } 6085 return 0; 6086} 6087 6088void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6089 if (!D) return; 6090 AdjustDeclIfTemplate(D); 6091 6092 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6093 CXXConstructorDecl *CtorDecl 6094 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6095 6096 if (!CtorDecl) return; 6097 6098 // Compute the exception specification for the default constructor. 6099 const FunctionProtoType *CtorTy = 6100 CtorDecl->getType()->castAs<FunctionProtoType>(); 6101 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6102 ImplicitExceptionSpecification Spec = 6103 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6104 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6105 assert(EPI.ExceptionSpecType != EST_Delayed); 6106 6107 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6108 } 6109 6110 // If the default constructor is explicitly defaulted, checking the exception 6111 // specification is deferred until now. 6112 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6113 !ClassDecl->isDependentType()) 6114 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6115} 6116 6117void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6118 // We start with an initial pass over the base classes to collect those that 6119 // inherit constructors from. If there are none, we can forgo all further 6120 // processing. 6121 typedef SmallVector<const RecordType *, 4> BasesVector; 6122 BasesVector BasesToInheritFrom; 6123 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6124 BaseE = ClassDecl->bases_end(); 6125 BaseIt != BaseE; ++BaseIt) { 6126 if (BaseIt->getInheritConstructors()) { 6127 QualType Base = BaseIt->getType(); 6128 if (Base->isDependentType()) { 6129 // If we inherit constructors from anything that is dependent, just 6130 // abort processing altogether. We'll get another chance for the 6131 // instantiations. 6132 return; 6133 } 6134 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6135 } 6136 } 6137 if (BasesToInheritFrom.empty()) 6138 return; 6139 6140 // Now collect the constructors that we already have in the current class. 6141 // Those take precedence over inherited constructors. 6142 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6143 // unless there is a user-declared constructor with the same signature in 6144 // the class where the using-declaration appears. 6145 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6146 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6147 CtorE = ClassDecl->ctor_end(); 6148 CtorIt != CtorE; ++CtorIt) { 6149 ExistingConstructors.insert( 6150 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6151 } 6152 6153 Scope *S = getScopeForContext(ClassDecl); 6154 DeclarationName CreatedCtorName = 6155 Context.DeclarationNames.getCXXConstructorName( 6156 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6157 6158 // Now comes the true work. 6159 // First, we keep a map from constructor types to the base that introduced 6160 // them. Needed for finding conflicting constructors. We also keep the 6161 // actually inserted declarations in there, for pretty diagnostics. 6162 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6163 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6164 ConstructorToSourceMap InheritedConstructors; 6165 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6166 BaseE = BasesToInheritFrom.end(); 6167 BaseIt != BaseE; ++BaseIt) { 6168 const RecordType *Base = *BaseIt; 6169 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6170 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6171 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6172 CtorE = BaseDecl->ctor_end(); 6173 CtorIt != CtorE; ++CtorIt) { 6174 // Find the using declaration for inheriting this base's constructors. 6175 DeclarationName Name = 6176 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6177 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6178 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6179 SourceLocation UsingLoc = UD ? UD->getLocation() : 6180 ClassDecl->getLocation(); 6181 6182 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6183 // from the class X named in the using-declaration consists of actual 6184 // constructors and notional constructors that result from the 6185 // transformation of defaulted parameters as follows: 6186 // - all non-template default constructors of X, and 6187 // - for each non-template constructor of X that has at least one 6188 // parameter with a default argument, the set of constructors that 6189 // results from omitting any ellipsis parameter specification and 6190 // successively omitting parameters with a default argument from the 6191 // end of the parameter-type-list. 6192 CXXConstructorDecl *BaseCtor = *CtorIt; 6193 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6194 const FunctionProtoType *BaseCtorType = 6195 BaseCtor->getType()->getAs<FunctionProtoType>(); 6196 6197 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6198 maxParams = BaseCtor->getNumParams(); 6199 params <= maxParams; ++params) { 6200 // Skip default constructors. They're never inherited. 6201 if (params == 0) 6202 continue; 6203 // Skip copy and move constructors for the same reason. 6204 if (CanBeCopyOrMove && params == 1) 6205 continue; 6206 6207 // Build up a function type for this particular constructor. 6208 // FIXME: The working paper does not consider that the exception spec 6209 // for the inheriting constructor might be larger than that of the 6210 // source. This code doesn't yet, either. When it does, this code will 6211 // need to be delayed until after exception specifications and in-class 6212 // member initializers are attached. 6213 const Type *NewCtorType; 6214 if (params == maxParams) 6215 NewCtorType = BaseCtorType; 6216 else { 6217 SmallVector<QualType, 16> Args; 6218 for (unsigned i = 0; i < params; ++i) { 6219 Args.push_back(BaseCtorType->getArgType(i)); 6220 } 6221 FunctionProtoType::ExtProtoInfo ExtInfo = 6222 BaseCtorType->getExtProtoInfo(); 6223 ExtInfo.Variadic = false; 6224 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6225 Args.data(), params, ExtInfo) 6226 .getTypePtr(); 6227 } 6228 const Type *CanonicalNewCtorType = 6229 Context.getCanonicalType(NewCtorType); 6230 6231 // Now that we have the type, first check if the class already has a 6232 // constructor with this signature. 6233 if (ExistingConstructors.count(CanonicalNewCtorType)) 6234 continue; 6235 6236 // Then we check if we have already declared an inherited constructor 6237 // with this signature. 6238 std::pair<ConstructorToSourceMap::iterator, bool> result = 6239 InheritedConstructors.insert(std::make_pair( 6240 CanonicalNewCtorType, 6241 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6242 if (!result.second) { 6243 // Already in the map. If it came from a different class, that's an 6244 // error. Not if it's from the same. 6245 CanQualType PreviousBase = result.first->second.first; 6246 if (CanonicalBase != PreviousBase) { 6247 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6248 const CXXConstructorDecl *PrevBaseCtor = 6249 PrevCtor->getInheritedConstructor(); 6250 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 6251 6252 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 6253 Diag(BaseCtor->getLocation(), 6254 diag::note_using_decl_constructor_conflict_current_ctor); 6255 Diag(PrevBaseCtor->getLocation(), 6256 diag::note_using_decl_constructor_conflict_previous_ctor); 6257 Diag(PrevCtor->getLocation(), 6258 diag::note_using_decl_constructor_conflict_previous_using); 6259 } 6260 continue; 6261 } 6262 6263 // OK, we're there, now add the constructor. 6264 // C++0x [class.inhctor]p8: [...] that would be performed by a 6265 // user-writtern inline constructor [...] 6266 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 6267 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 6268 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 6269 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 6270 /*ImplicitlyDeclared=*/true); 6271 NewCtor->setAccess(BaseCtor->getAccess()); 6272 6273 // Build up the parameter decls and add them. 6274 SmallVector<ParmVarDecl *, 16> ParamDecls; 6275 for (unsigned i = 0; i < params; ++i) { 6276 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 6277 UsingLoc, UsingLoc, 6278 /*IdentifierInfo=*/0, 6279 BaseCtorType->getArgType(i), 6280 /*TInfo=*/0, SC_None, 6281 SC_None, /*DefaultArg=*/0)); 6282 } 6283 NewCtor->setParams(ParamDecls.data(), ParamDecls.size()); 6284 NewCtor->setInheritedConstructor(BaseCtor); 6285 6286 PushOnScopeChains(NewCtor, S, false); 6287 ClassDecl->addDecl(NewCtor); 6288 result.first->second.second = NewCtor; 6289 } 6290 } 6291 } 6292} 6293 6294Sema::ImplicitExceptionSpecification 6295Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6296 // C++ [except.spec]p14: 6297 // An implicitly declared special member function (Clause 12) shall have 6298 // an exception-specification. 6299 ImplicitExceptionSpecification ExceptSpec(Context); 6300 if (ClassDecl->isInvalidDecl()) 6301 return ExceptSpec; 6302 6303 // Direct base-class destructors. 6304 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6305 BEnd = ClassDecl->bases_end(); 6306 B != BEnd; ++B) { 6307 if (B->isVirtual()) // Handled below. 6308 continue; 6309 6310 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6311 ExceptSpec.CalledDecl( 6312 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6313 } 6314 6315 // Virtual base-class destructors. 6316 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6317 BEnd = ClassDecl->vbases_end(); 6318 B != BEnd; ++B) { 6319 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 6320 ExceptSpec.CalledDecl( 6321 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 6322 } 6323 6324 // Field destructors. 6325 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6326 FEnd = ClassDecl->field_end(); 6327 F != FEnd; ++F) { 6328 if (const RecordType *RecordTy 6329 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 6330 ExceptSpec.CalledDecl( 6331 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 6332 } 6333 6334 return ExceptSpec; 6335} 6336 6337CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 6338 // C++ [class.dtor]p2: 6339 // If a class has no user-declared destructor, a destructor is 6340 // declared implicitly. An implicitly-declared destructor is an 6341 // inline public member of its class. 6342 6343 ImplicitExceptionSpecification Spec = 6344 ComputeDefaultedDtorExceptionSpec(ClassDecl); 6345 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6346 6347 // Create the actual destructor declaration. 6348 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 6349 6350 CanQualType ClassType 6351 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6352 SourceLocation ClassLoc = ClassDecl->getLocation(); 6353 DeclarationName Name 6354 = Context.DeclarationNames.getCXXDestructorName(ClassType); 6355 DeclarationNameInfo NameInfo(Name, ClassLoc); 6356 CXXDestructorDecl *Destructor 6357 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 6358 /*isInline=*/true, 6359 /*isImplicitlyDeclared=*/true); 6360 Destructor->setAccess(AS_public); 6361 Destructor->setDefaulted(); 6362 Destructor->setImplicit(); 6363 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 6364 6365 // Note that we have declared this destructor. 6366 ++ASTContext::NumImplicitDestructorsDeclared; 6367 6368 // Introduce this destructor into its scope. 6369 if (Scope *S = getScopeForContext(ClassDecl)) 6370 PushOnScopeChains(Destructor, S, false); 6371 ClassDecl->addDecl(Destructor); 6372 6373 // This could be uniqued if it ever proves significant. 6374 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 6375 6376 if (ShouldDeleteDestructor(Destructor)) 6377 Destructor->setDeletedAsWritten(); 6378 6379 AddOverriddenMethods(ClassDecl, Destructor); 6380 6381 return Destructor; 6382} 6383 6384void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 6385 CXXDestructorDecl *Destructor) { 6386 assert((Destructor->isDefaulted() && 6387 !Destructor->doesThisDeclarationHaveABody()) && 6388 "DefineImplicitDestructor - call it for implicit default dtor"); 6389 CXXRecordDecl *ClassDecl = Destructor->getParent(); 6390 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 6391 6392 if (Destructor->isInvalidDecl()) 6393 return; 6394 6395 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 6396 6397 DiagnosticErrorTrap Trap(Diags); 6398 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6399 Destructor->getParent()); 6400 6401 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 6402 Diag(CurrentLocation, diag::note_member_synthesized_at) 6403 << CXXDestructor << Context.getTagDeclType(ClassDecl); 6404 6405 Destructor->setInvalidDecl(); 6406 return; 6407 } 6408 6409 SourceLocation Loc = Destructor->getLocation(); 6410 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6411 6412 Destructor->setUsed(); 6413 MarkVTableUsed(CurrentLocation, ClassDecl); 6414 6415 if (ASTMutationListener *L = getASTMutationListener()) { 6416 L->CompletedImplicitDefinition(Destructor); 6417 } 6418} 6419 6420void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 6421 CXXDestructorDecl *destructor) { 6422 // C++11 [class.dtor]p3: 6423 // A declaration of a destructor that does not have an exception- 6424 // specification is implicitly considered to have the same exception- 6425 // specification as an implicit declaration. 6426 const FunctionProtoType *dtorType = destructor->getType()-> 6427 getAs<FunctionProtoType>(); 6428 if (dtorType->hasExceptionSpec()) 6429 return; 6430 6431 ImplicitExceptionSpecification exceptSpec = 6432 ComputeDefaultedDtorExceptionSpec(classDecl); 6433 6434 // Replace the destructor's type. 6435 FunctionProtoType::ExtProtoInfo epi; 6436 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 6437 epi.NumExceptions = exceptSpec.size(); 6438 epi.Exceptions = exceptSpec.data(); 6439 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 6440 6441 destructor->setType(ty); 6442 6443 // FIXME: If the destructor has a body that could throw, and the newly created 6444 // spec doesn't allow exceptions, we should emit a warning, because this 6445 // change in behavior can break conforming C++03 programs at runtime. 6446 // However, we don't have a body yet, so it needs to be done somewhere else. 6447} 6448 6449/// \brief Builds a statement that copies the given entity from \p From to 6450/// \c To. 6451/// 6452/// This routine is used to copy the members of a class with an 6453/// implicitly-declared copy assignment operator. When the entities being 6454/// copied are arrays, this routine builds for loops to copy them. 6455/// 6456/// \param S The Sema object used for type-checking. 6457/// 6458/// \param Loc The location where the implicit copy is being generated. 6459/// 6460/// \param T The type of the expressions being copied. Both expressions must 6461/// have this type. 6462/// 6463/// \param To The expression we are copying to. 6464/// 6465/// \param From The expression we are copying from. 6466/// 6467/// \param CopyingBaseSubobject Whether we're copying a base subobject. 6468/// Otherwise, it's a non-static member subobject. 6469/// 6470/// \param Depth Internal parameter recording the depth of the recursion. 6471/// 6472/// \returns A statement or a loop that copies the expressions. 6473static StmtResult 6474BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 6475 Expr *To, Expr *From, 6476 bool CopyingBaseSubobject, unsigned Depth = 0) { 6477 // C++0x [class.copy]p30: 6478 // Each subobject is assigned in the manner appropriate to its type: 6479 // 6480 // - if the subobject is of class type, the copy assignment operator 6481 // for the class is used (as if by explicit qualification; that is, 6482 // ignoring any possible virtual overriding functions in more derived 6483 // classes); 6484 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 6485 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6486 6487 // Look for operator=. 6488 DeclarationName Name 6489 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6490 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 6491 S.LookupQualifiedName(OpLookup, ClassDecl, false); 6492 6493 // Filter out any result that isn't a copy-assignment operator. 6494 LookupResult::Filter F = OpLookup.makeFilter(); 6495 while (F.hasNext()) { 6496 NamedDecl *D = F.next(); 6497 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 6498 if (Method->isCopyAssignmentOperator()) 6499 continue; 6500 6501 F.erase(); 6502 } 6503 F.done(); 6504 6505 // Suppress the protected check (C++ [class.protected]) for each of the 6506 // assignment operators we found. This strange dance is required when 6507 // we're assigning via a base classes's copy-assignment operator. To 6508 // ensure that we're getting the right base class subobject (without 6509 // ambiguities), we need to cast "this" to that subobject type; to 6510 // ensure that we don't go through the virtual call mechanism, we need 6511 // to qualify the operator= name with the base class (see below). However, 6512 // this means that if the base class has a protected copy assignment 6513 // operator, the protected member access check will fail. So, we 6514 // rewrite "protected" access to "public" access in this case, since we 6515 // know by construction that we're calling from a derived class. 6516 if (CopyingBaseSubobject) { 6517 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 6518 L != LEnd; ++L) { 6519 if (L.getAccess() == AS_protected) 6520 L.setAccess(AS_public); 6521 } 6522 } 6523 6524 // Create the nested-name-specifier that will be used to qualify the 6525 // reference to operator=; this is required to suppress the virtual 6526 // call mechanism. 6527 CXXScopeSpec SS; 6528 SS.MakeTrivial(S.Context, 6529 NestedNameSpecifier::Create(S.Context, 0, false, 6530 T.getTypePtr()), 6531 Loc); 6532 6533 // Create the reference to operator=. 6534 ExprResult OpEqualRef 6535 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 6536 /*FirstQualifierInScope=*/0, OpLookup, 6537 /*TemplateArgs=*/0, 6538 /*SuppressQualifierCheck=*/true); 6539 if (OpEqualRef.isInvalid()) 6540 return StmtError(); 6541 6542 // Build the call to the assignment operator. 6543 6544 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 6545 OpEqualRef.takeAs<Expr>(), 6546 Loc, &From, 1, Loc); 6547 if (Call.isInvalid()) 6548 return StmtError(); 6549 6550 return S.Owned(Call.takeAs<Stmt>()); 6551 } 6552 6553 // - if the subobject is of scalar type, the built-in assignment 6554 // operator is used. 6555 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 6556 if (!ArrayTy) { 6557 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 6558 if (Assignment.isInvalid()) 6559 return StmtError(); 6560 6561 return S.Owned(Assignment.takeAs<Stmt>()); 6562 } 6563 6564 // - if the subobject is an array, each element is assigned, in the 6565 // manner appropriate to the element type; 6566 6567 // Construct a loop over the array bounds, e.g., 6568 // 6569 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 6570 // 6571 // that will copy each of the array elements. 6572 QualType SizeType = S.Context.getSizeType(); 6573 6574 // Create the iteration variable. 6575 IdentifierInfo *IterationVarName = 0; 6576 { 6577 llvm::SmallString<8> Str; 6578 llvm::raw_svector_ostream OS(Str); 6579 OS << "__i" << Depth; 6580 IterationVarName = &S.Context.Idents.get(OS.str()); 6581 } 6582 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 6583 IterationVarName, SizeType, 6584 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 6585 SC_None, SC_None); 6586 6587 // Initialize the iteration variable to zero. 6588 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 6589 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 6590 6591 // Create a reference to the iteration variable; we'll use this several 6592 // times throughout. 6593 Expr *IterationVarRef 6594 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_RValue, Loc).take(); 6595 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 6596 6597 // Create the DeclStmt that holds the iteration variable. 6598 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 6599 6600 // Create the comparison against the array bound. 6601 llvm::APInt Upper 6602 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 6603 Expr *Comparison 6604 = new (S.Context) BinaryOperator(IterationVarRef, 6605 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 6606 BO_NE, S.Context.BoolTy, 6607 VK_RValue, OK_Ordinary, Loc); 6608 6609 // Create the pre-increment of the iteration variable. 6610 Expr *Increment 6611 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 6612 VK_LValue, OK_Ordinary, Loc); 6613 6614 // Subscript the "from" and "to" expressions with the iteration variable. 6615 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 6616 IterationVarRef, Loc)); 6617 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 6618 IterationVarRef, Loc)); 6619 6620 // Build the copy for an individual element of the array. 6621 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 6622 To, From, CopyingBaseSubobject, 6623 Depth + 1); 6624 if (Copy.isInvalid()) 6625 return StmtError(); 6626 6627 // Construct the loop that copies all elements of this array. 6628 return S.ActOnForStmt(Loc, Loc, InitStmt, 6629 S.MakeFullExpr(Comparison), 6630 0, S.MakeFullExpr(Increment), 6631 Loc, Copy.take()); 6632} 6633 6634std::pair<Sema::ImplicitExceptionSpecification, bool> 6635Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 6636 CXXRecordDecl *ClassDecl) { 6637 if (ClassDecl->isInvalidDecl()) 6638 return std::make_pair(ImplicitExceptionSpecification(Context), false); 6639 6640 // C++ [class.copy]p10: 6641 // If the class definition does not explicitly declare a copy 6642 // assignment operator, one is declared implicitly. 6643 // The implicitly-defined copy assignment operator for a class X 6644 // will have the form 6645 // 6646 // X& X::operator=(const X&) 6647 // 6648 // if 6649 bool HasConstCopyAssignment = true; 6650 6651 // -- each direct base class B of X has a copy assignment operator 6652 // whose parameter is of type const B&, const volatile B& or B, 6653 // and 6654 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6655 BaseEnd = ClassDecl->bases_end(); 6656 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6657 // We'll handle this below 6658 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 6659 continue; 6660 6661 assert(!Base->getType()->isDependentType() && 6662 "Cannot generate implicit members for class with dependent bases."); 6663 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 6664 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 6665 &HasConstCopyAssignment); 6666 } 6667 6668 // In C++0x, the above citation has "or virtual added" 6669 if (LangOpts.CPlusPlus0x) { 6670 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6671 BaseEnd = ClassDecl->vbases_end(); 6672 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 6673 assert(!Base->getType()->isDependentType() && 6674 "Cannot generate implicit members for class with dependent bases."); 6675 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 6676 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 6677 &HasConstCopyAssignment); 6678 } 6679 } 6680 6681 // -- for all the nonstatic data members of X that are of a class 6682 // type M (or array thereof), each such class type has a copy 6683 // assignment operator whose parameter is of type const M&, 6684 // const volatile M& or M. 6685 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6686 FieldEnd = ClassDecl->field_end(); 6687 HasConstCopyAssignment && Field != FieldEnd; 6688 ++Field) { 6689 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6690 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 6691 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 6692 &HasConstCopyAssignment); 6693 } 6694 } 6695 6696 // Otherwise, the implicitly declared copy assignment operator will 6697 // have the form 6698 // 6699 // X& X::operator=(X&) 6700 6701 // C++ [except.spec]p14: 6702 // An implicitly declared special member function (Clause 12) shall have an 6703 // exception-specification. [...] 6704 6705 // It is unspecified whether or not an implicit copy assignment operator 6706 // attempts to deduplicate calls to assignment operators of virtual bases are 6707 // made. As such, this exception specification is effectively unspecified. 6708 // Based on a similar decision made for constness in C++0x, we're erring on 6709 // the side of assuming such calls to be made regardless of whether they 6710 // actually happen. 6711 ImplicitExceptionSpecification ExceptSpec(Context); 6712 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 6713 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6714 BaseEnd = ClassDecl->bases_end(); 6715 Base != BaseEnd; ++Base) { 6716 if (Base->isVirtual()) 6717 continue; 6718 6719 CXXRecordDecl *BaseClassDecl 6720 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6721 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 6722 ArgQuals, false, 0)) 6723 ExceptSpec.CalledDecl(CopyAssign); 6724 } 6725 6726 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 6727 BaseEnd = ClassDecl->vbases_end(); 6728 Base != BaseEnd; ++Base) { 6729 CXXRecordDecl *BaseClassDecl 6730 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 6731 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 6732 ArgQuals, false, 0)) 6733 ExceptSpec.CalledDecl(CopyAssign); 6734 } 6735 6736 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6737 FieldEnd = ClassDecl->field_end(); 6738 Field != FieldEnd; 6739 ++Field) { 6740 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 6741 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 6742 if (CXXMethodDecl *CopyAssign = 6743 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 6744 ExceptSpec.CalledDecl(CopyAssign); 6745 } 6746 } 6747 6748 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 6749} 6750 6751CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 6752 // Note: The following rules are largely analoguous to the copy 6753 // constructor rules. Note that virtual bases are not taken into account 6754 // for determining the argument type of the operator. Note also that 6755 // operators taking an object instead of a reference are allowed. 6756 6757 ImplicitExceptionSpecification Spec(Context); 6758 bool Const; 6759 llvm::tie(Spec, Const) = 6760 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 6761 6762 QualType ArgType = Context.getTypeDeclType(ClassDecl); 6763 QualType RetType = Context.getLValueReferenceType(ArgType); 6764 if (Const) 6765 ArgType = ArgType.withConst(); 6766 ArgType = Context.getLValueReferenceType(ArgType); 6767 6768 // An implicitly-declared copy assignment operator is an inline public 6769 // member of its class. 6770 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6771 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 6772 SourceLocation ClassLoc = ClassDecl->getLocation(); 6773 DeclarationNameInfo NameInfo(Name, ClassLoc); 6774 CXXMethodDecl *CopyAssignment 6775 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 6776 Context.getFunctionType(RetType, &ArgType, 1, EPI), 6777 /*TInfo=*/0, /*isStatic=*/false, 6778 /*StorageClassAsWritten=*/SC_None, 6779 /*isInline=*/true, 6780 SourceLocation()); 6781 CopyAssignment->setAccess(AS_public); 6782 CopyAssignment->setDefaulted(); 6783 CopyAssignment->setImplicit(); 6784 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 6785 6786 // Add the parameter to the operator. 6787 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 6788 ClassLoc, ClassLoc, /*Id=*/0, 6789 ArgType, /*TInfo=*/0, 6790 SC_None, 6791 SC_None, 0); 6792 CopyAssignment->setParams(&FromParam, 1); 6793 6794 // Note that we have added this copy-assignment operator. 6795 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 6796 6797 if (Scope *S = getScopeForContext(ClassDecl)) 6798 PushOnScopeChains(CopyAssignment, S, false); 6799 ClassDecl->addDecl(CopyAssignment); 6800 6801 // C++0x [class.copy]p18: 6802 // ... If the class definition declares a move constructor or move 6803 // assignment operator, the implicitly declared copy assignment operator is 6804 // defined as deleted; ... 6805 if (ClassDecl->hasUserDeclaredMoveConstructor() || 6806 ClassDecl->hasUserDeclaredMoveAssignment() || 6807 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 6808 CopyAssignment->setDeletedAsWritten(); 6809 6810 AddOverriddenMethods(ClassDecl, CopyAssignment); 6811 return CopyAssignment; 6812} 6813 6814void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 6815 CXXMethodDecl *CopyAssignOperator) { 6816 assert((CopyAssignOperator->isDefaulted() && 6817 CopyAssignOperator->isOverloadedOperator() && 6818 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 6819 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 6820 "DefineImplicitCopyAssignment called for wrong function"); 6821 6822 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 6823 6824 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 6825 CopyAssignOperator->setInvalidDecl(); 6826 return; 6827 } 6828 6829 CopyAssignOperator->setUsed(); 6830 6831 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 6832 DiagnosticErrorTrap Trap(Diags); 6833 6834 // C++0x [class.copy]p30: 6835 // The implicitly-defined or explicitly-defaulted copy assignment operator 6836 // for a non-union class X performs memberwise copy assignment of its 6837 // subobjects. The direct base classes of X are assigned first, in the 6838 // order of their declaration in the base-specifier-list, and then the 6839 // immediate non-static data members of X are assigned, in the order in 6840 // which they were declared in the class definition. 6841 6842 // The statements that form the synthesized function body. 6843 ASTOwningVector<Stmt*> Statements(*this); 6844 6845 // The parameter for the "other" object, which we are copying from. 6846 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 6847 Qualifiers OtherQuals = Other->getType().getQualifiers(); 6848 QualType OtherRefType = Other->getType(); 6849 if (const LValueReferenceType *OtherRef 6850 = OtherRefType->getAs<LValueReferenceType>()) { 6851 OtherRefType = OtherRef->getPointeeType(); 6852 OtherQuals = OtherRefType.getQualifiers(); 6853 } 6854 6855 // Our location for everything implicitly-generated. 6856 SourceLocation Loc = CopyAssignOperator->getLocation(); 6857 6858 // Construct a reference to the "other" object. We'll be using this 6859 // throughout the generated ASTs. 6860 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 6861 assert(OtherRef && "Reference to parameter cannot fail!"); 6862 6863 // Construct the "this" pointer. We'll be using this throughout the generated 6864 // ASTs. 6865 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 6866 assert(This && "Reference to this cannot fail!"); 6867 6868 // Assign base classes. 6869 bool Invalid = false; 6870 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 6871 E = ClassDecl->bases_end(); Base != E; ++Base) { 6872 // Form the assignment: 6873 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 6874 QualType BaseType = Base->getType().getUnqualifiedType(); 6875 if (!BaseType->isRecordType()) { 6876 Invalid = true; 6877 continue; 6878 } 6879 6880 CXXCastPath BasePath; 6881 BasePath.push_back(Base); 6882 6883 // Construct the "from" expression, which is an implicit cast to the 6884 // appropriately-qualified base type. 6885 Expr *From = OtherRef; 6886 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 6887 CK_UncheckedDerivedToBase, 6888 VK_LValue, &BasePath).take(); 6889 6890 // Dereference "this". 6891 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 6892 6893 // Implicitly cast "this" to the appropriately-qualified base type. 6894 To = ImpCastExprToType(To.take(), 6895 Context.getCVRQualifiedType(BaseType, 6896 CopyAssignOperator->getTypeQualifiers()), 6897 CK_UncheckedDerivedToBase, 6898 VK_LValue, &BasePath); 6899 6900 // Build the copy. 6901 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 6902 To.get(), From, 6903 /*CopyingBaseSubobject=*/true); 6904 if (Copy.isInvalid()) { 6905 Diag(CurrentLocation, diag::note_member_synthesized_at) 6906 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6907 CopyAssignOperator->setInvalidDecl(); 6908 return; 6909 } 6910 6911 // Success! Record the copy. 6912 Statements.push_back(Copy.takeAs<Expr>()); 6913 } 6914 6915 // \brief Reference to the __builtin_memcpy function. 6916 Expr *BuiltinMemCpyRef = 0; 6917 // \brief Reference to the __builtin_objc_memmove_collectable function. 6918 Expr *CollectableMemCpyRef = 0; 6919 6920 // Assign non-static members. 6921 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 6922 FieldEnd = ClassDecl->field_end(); 6923 Field != FieldEnd; ++Field) { 6924 // Check for members of reference type; we can't copy those. 6925 if (Field->getType()->isReferenceType()) { 6926 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6927 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 6928 Diag(Field->getLocation(), diag::note_declared_at); 6929 Diag(CurrentLocation, diag::note_member_synthesized_at) 6930 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6931 Invalid = true; 6932 continue; 6933 } 6934 6935 // Check for members of const-qualified, non-class type. 6936 QualType BaseType = Context.getBaseElementType(Field->getType()); 6937 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 6938 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 6939 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 6940 Diag(Field->getLocation(), diag::note_declared_at); 6941 Diag(CurrentLocation, diag::note_member_synthesized_at) 6942 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 6943 Invalid = true; 6944 continue; 6945 } 6946 6947 // Suppress assigning zero-width bitfields. 6948 if (const Expr *Width = Field->getBitWidth()) 6949 if (Width->EvaluateAsInt(Context) == 0) 6950 continue; 6951 6952 QualType FieldType = Field->getType().getNonReferenceType(); 6953 if (FieldType->isIncompleteArrayType()) { 6954 assert(ClassDecl->hasFlexibleArrayMember() && 6955 "Incomplete array type is not valid"); 6956 continue; 6957 } 6958 6959 // Build references to the field in the object we're copying from and to. 6960 CXXScopeSpec SS; // Intentionally empty 6961 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 6962 LookupMemberName); 6963 MemberLookup.addDecl(*Field); 6964 MemberLookup.resolveKind(); 6965 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 6966 Loc, /*IsArrow=*/false, 6967 SS, 0, MemberLookup, 0); 6968 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 6969 Loc, /*IsArrow=*/true, 6970 SS, 0, MemberLookup, 0); 6971 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 6972 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 6973 6974 // If the field should be copied with __builtin_memcpy rather than via 6975 // explicit assignments, do so. This optimization only applies for arrays 6976 // of scalars and arrays of class type with trivial copy-assignment 6977 // operators. 6978 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 6979 && BaseType.hasTrivialCopyAssignment(Context)) { 6980 // Compute the size of the memory buffer to be copied. 6981 QualType SizeType = Context.getSizeType(); 6982 llvm::APInt Size(Context.getTypeSize(SizeType), 6983 Context.getTypeSizeInChars(BaseType).getQuantity()); 6984 for (const ConstantArrayType *Array 6985 = Context.getAsConstantArrayType(FieldType); 6986 Array; 6987 Array = Context.getAsConstantArrayType(Array->getElementType())) { 6988 llvm::APInt ArraySize 6989 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 6990 Size *= ArraySize; 6991 } 6992 6993 // Take the address of the field references for "from" and "to". 6994 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 6995 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 6996 6997 bool NeedsCollectableMemCpy = 6998 (BaseType->isRecordType() && 6999 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7000 7001 if (NeedsCollectableMemCpy) { 7002 if (!CollectableMemCpyRef) { 7003 // Create a reference to the __builtin_objc_memmove_collectable function. 7004 LookupResult R(*this, 7005 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7006 Loc, LookupOrdinaryName); 7007 LookupName(R, TUScope, true); 7008 7009 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7010 if (!CollectableMemCpy) { 7011 // Something went horribly wrong earlier, and we will have 7012 // complained about it. 7013 Invalid = true; 7014 continue; 7015 } 7016 7017 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7018 CollectableMemCpy->getType(), 7019 VK_LValue, Loc, 0).take(); 7020 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7021 } 7022 } 7023 // Create a reference to the __builtin_memcpy builtin function. 7024 else if (!BuiltinMemCpyRef) { 7025 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7026 LookupOrdinaryName); 7027 LookupName(R, TUScope, true); 7028 7029 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7030 if (!BuiltinMemCpy) { 7031 // Something went horribly wrong earlier, and we will have complained 7032 // about it. 7033 Invalid = true; 7034 continue; 7035 } 7036 7037 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7038 BuiltinMemCpy->getType(), 7039 VK_LValue, Loc, 0).take(); 7040 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7041 } 7042 7043 ASTOwningVector<Expr*> CallArgs(*this); 7044 CallArgs.push_back(To.takeAs<Expr>()); 7045 CallArgs.push_back(From.takeAs<Expr>()); 7046 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7047 ExprResult Call = ExprError(); 7048 if (NeedsCollectableMemCpy) 7049 Call = ActOnCallExpr(/*Scope=*/0, 7050 CollectableMemCpyRef, 7051 Loc, move_arg(CallArgs), 7052 Loc); 7053 else 7054 Call = ActOnCallExpr(/*Scope=*/0, 7055 BuiltinMemCpyRef, 7056 Loc, move_arg(CallArgs), 7057 Loc); 7058 7059 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7060 Statements.push_back(Call.takeAs<Expr>()); 7061 continue; 7062 } 7063 7064 // Build the copy of this field. 7065 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7066 To.get(), From.get(), 7067 /*CopyingBaseSubobject=*/false); 7068 if (Copy.isInvalid()) { 7069 Diag(CurrentLocation, diag::note_member_synthesized_at) 7070 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7071 CopyAssignOperator->setInvalidDecl(); 7072 return; 7073 } 7074 7075 // Success! Record the copy. 7076 Statements.push_back(Copy.takeAs<Stmt>()); 7077 } 7078 7079 if (!Invalid) { 7080 // Add a "return *this;" 7081 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7082 7083 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7084 if (Return.isInvalid()) 7085 Invalid = true; 7086 else { 7087 Statements.push_back(Return.takeAs<Stmt>()); 7088 7089 if (Trap.hasErrorOccurred()) { 7090 Diag(CurrentLocation, diag::note_member_synthesized_at) 7091 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7092 Invalid = true; 7093 } 7094 } 7095 } 7096 7097 if (Invalid) { 7098 CopyAssignOperator->setInvalidDecl(); 7099 return; 7100 } 7101 7102 StmtResult Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7103 /*isStmtExpr=*/false); 7104 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7105 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7106 7107 if (ASTMutationListener *L = getASTMutationListener()) { 7108 L->CompletedImplicitDefinition(CopyAssignOperator); 7109 } 7110} 7111 7112std::pair<Sema::ImplicitExceptionSpecification, bool> 7113Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 7114 if (ClassDecl->isInvalidDecl()) 7115 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7116 7117 // C++ [class.copy]p5: 7118 // The implicitly-declared copy constructor for a class X will 7119 // have the form 7120 // 7121 // X::X(const X&) 7122 // 7123 // if 7124 // FIXME: It ought to be possible to store this on the record. 7125 bool HasConstCopyConstructor = true; 7126 7127 // -- each direct or virtual base class B of X has a copy 7128 // constructor whose first parameter is of type const B& or 7129 // const volatile B&, and 7130 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7131 BaseEnd = ClassDecl->bases_end(); 7132 HasConstCopyConstructor && Base != BaseEnd; 7133 ++Base) { 7134 // Virtual bases are handled below. 7135 if (Base->isVirtual()) 7136 continue; 7137 7138 CXXRecordDecl *BaseClassDecl 7139 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7140 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 7141 &HasConstCopyConstructor); 7142 } 7143 7144 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7145 BaseEnd = ClassDecl->vbases_end(); 7146 HasConstCopyConstructor && Base != BaseEnd; 7147 ++Base) { 7148 CXXRecordDecl *BaseClassDecl 7149 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7150 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 7151 &HasConstCopyConstructor); 7152 } 7153 7154 // -- for all the nonstatic data members of X that are of a 7155 // class type M (or array thereof), each such class type 7156 // has a copy constructor whose first parameter is of type 7157 // const M& or const volatile M&. 7158 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7159 FieldEnd = ClassDecl->field_end(); 7160 HasConstCopyConstructor && Field != FieldEnd; 7161 ++Field) { 7162 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7163 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7164 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 7165 &HasConstCopyConstructor); 7166 } 7167 } 7168 // Otherwise, the implicitly declared copy constructor will have 7169 // the form 7170 // 7171 // X::X(X&) 7172 7173 // C++ [except.spec]p14: 7174 // An implicitly declared special member function (Clause 12) shall have an 7175 // exception-specification. [...] 7176 ImplicitExceptionSpecification ExceptSpec(Context); 7177 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 7178 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7179 BaseEnd = ClassDecl->bases_end(); 7180 Base != BaseEnd; 7181 ++Base) { 7182 // Virtual bases are handled below. 7183 if (Base->isVirtual()) 7184 continue; 7185 7186 CXXRecordDecl *BaseClassDecl 7187 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7188 if (CXXConstructorDecl *CopyConstructor = 7189 LookupCopyingConstructor(BaseClassDecl, Quals)) 7190 ExceptSpec.CalledDecl(CopyConstructor); 7191 } 7192 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7193 BaseEnd = ClassDecl->vbases_end(); 7194 Base != BaseEnd; 7195 ++Base) { 7196 CXXRecordDecl *BaseClassDecl 7197 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7198 if (CXXConstructorDecl *CopyConstructor = 7199 LookupCopyingConstructor(BaseClassDecl, Quals)) 7200 ExceptSpec.CalledDecl(CopyConstructor); 7201 } 7202 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7203 FieldEnd = ClassDecl->field_end(); 7204 Field != FieldEnd; 7205 ++Field) { 7206 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7207 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7208 if (CXXConstructorDecl *CopyConstructor = 7209 LookupCopyingConstructor(FieldClassDecl, Quals)) 7210 ExceptSpec.CalledDecl(CopyConstructor); 7211 } 7212 } 7213 7214 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 7215} 7216 7217CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 7218 CXXRecordDecl *ClassDecl) { 7219 // C++ [class.copy]p4: 7220 // If the class definition does not explicitly declare a copy 7221 // constructor, one is declared implicitly. 7222 7223 ImplicitExceptionSpecification Spec(Context); 7224 bool Const; 7225 llvm::tie(Spec, Const) = 7226 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 7227 7228 QualType ClassType = Context.getTypeDeclType(ClassDecl); 7229 QualType ArgType = ClassType; 7230 if (Const) 7231 ArgType = ArgType.withConst(); 7232 ArgType = Context.getLValueReferenceType(ArgType); 7233 7234 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7235 7236 DeclarationName Name 7237 = Context.DeclarationNames.getCXXConstructorName( 7238 Context.getCanonicalType(ClassType)); 7239 SourceLocation ClassLoc = ClassDecl->getLocation(); 7240 DeclarationNameInfo NameInfo(Name, ClassLoc); 7241 7242 // An implicitly-declared copy constructor is an inline public 7243 // member of its class. 7244 CXXConstructorDecl *CopyConstructor 7245 = CXXConstructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7246 Context.getFunctionType(Context.VoidTy, 7247 &ArgType, 1, EPI), 7248 /*TInfo=*/0, 7249 /*isExplicit=*/false, 7250 /*isInline=*/true, 7251 /*isImplicitlyDeclared=*/true); 7252 CopyConstructor->setAccess(AS_public); 7253 CopyConstructor->setDefaulted(); 7254 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 7255 7256 // Note that we have declared this constructor. 7257 ++ASTContext::NumImplicitCopyConstructorsDeclared; 7258 7259 // Add the parameter to the constructor. 7260 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 7261 ClassLoc, ClassLoc, 7262 /*IdentifierInfo=*/0, 7263 ArgType, /*TInfo=*/0, 7264 SC_None, 7265 SC_None, 0); 7266 CopyConstructor->setParams(&FromParam, 1); 7267 7268 if (Scope *S = getScopeForContext(ClassDecl)) 7269 PushOnScopeChains(CopyConstructor, S, false); 7270 ClassDecl->addDecl(CopyConstructor); 7271 7272 // C++0x [class.copy]p7: 7273 // ... If the class definition declares a move constructor or move 7274 // assignment operator, the implicitly declared constructor is defined as 7275 // deleted; ... 7276 if (ClassDecl->hasUserDeclaredMoveConstructor() || 7277 ClassDecl->hasUserDeclaredMoveAssignment() || 7278 ShouldDeleteCopyConstructor(CopyConstructor)) 7279 CopyConstructor->setDeletedAsWritten(); 7280 7281 return CopyConstructor; 7282} 7283 7284void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 7285 CXXConstructorDecl *CopyConstructor) { 7286 assert((CopyConstructor->isDefaulted() && 7287 CopyConstructor->isCopyConstructor() && 7288 !CopyConstructor->doesThisDeclarationHaveABody()) && 7289 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 7290 7291 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 7292 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 7293 7294 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 7295 DiagnosticErrorTrap Trap(Diags); 7296 7297 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 7298 Trap.hasErrorOccurred()) { 7299 Diag(CurrentLocation, diag::note_member_synthesized_at) 7300 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 7301 CopyConstructor->setInvalidDecl(); 7302 } else { 7303 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 7304 CopyConstructor->getLocation(), 7305 MultiStmtArg(*this, 0, 0), 7306 /*isStmtExpr=*/false) 7307 .takeAs<Stmt>()); 7308 } 7309 7310 CopyConstructor->setUsed(); 7311 7312 if (ASTMutationListener *L = getASTMutationListener()) { 7313 L->CompletedImplicitDefinition(CopyConstructor); 7314 } 7315} 7316 7317ExprResult 7318Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7319 CXXConstructorDecl *Constructor, 7320 MultiExprArg ExprArgs, 7321 bool RequiresZeroInit, 7322 unsigned ConstructKind, 7323 SourceRange ParenRange) { 7324 bool Elidable = false; 7325 7326 // C++0x [class.copy]p34: 7327 // When certain criteria are met, an implementation is allowed to 7328 // omit the copy/move construction of a class object, even if the 7329 // copy/move constructor and/or destructor for the object have 7330 // side effects. [...] 7331 // - when a temporary class object that has not been bound to a 7332 // reference (12.2) would be copied/moved to a class object 7333 // with the same cv-unqualified type, the copy/move operation 7334 // can be omitted by constructing the temporary object 7335 // directly into the target of the omitted copy/move 7336 if (ConstructKind == CXXConstructExpr::CK_Complete && 7337 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 7338 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 7339 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 7340 } 7341 7342 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 7343 Elidable, move(ExprArgs), RequiresZeroInit, 7344 ConstructKind, ParenRange); 7345} 7346 7347/// BuildCXXConstructExpr - Creates a complete call to a constructor, 7348/// including handling of its default argument expressions. 7349ExprResult 7350Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 7351 CXXConstructorDecl *Constructor, bool Elidable, 7352 MultiExprArg ExprArgs, 7353 bool RequiresZeroInit, 7354 unsigned ConstructKind, 7355 SourceRange ParenRange) { 7356 unsigned NumExprs = ExprArgs.size(); 7357 Expr **Exprs = (Expr **)ExprArgs.release(); 7358 7359 for (specific_attr_iterator<NonNullAttr> 7360 i = Constructor->specific_attr_begin<NonNullAttr>(), 7361 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 7362 const NonNullAttr *NonNull = *i; 7363 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 7364 } 7365 7366 MarkDeclarationReferenced(ConstructLoc, Constructor); 7367 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 7368 Constructor, Elidable, Exprs, NumExprs, 7369 RequiresZeroInit, 7370 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 7371 ParenRange)); 7372} 7373 7374bool Sema::InitializeVarWithConstructor(VarDecl *VD, 7375 CXXConstructorDecl *Constructor, 7376 MultiExprArg Exprs) { 7377 // FIXME: Provide the correct paren SourceRange when available. 7378 ExprResult TempResult = 7379 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 7380 move(Exprs), false, CXXConstructExpr::CK_Complete, 7381 SourceRange()); 7382 if (TempResult.isInvalid()) 7383 return true; 7384 7385 Expr *Temp = TempResult.takeAs<Expr>(); 7386 CheckImplicitConversions(Temp, VD->getLocation()); 7387 MarkDeclarationReferenced(VD->getLocation(), Constructor); 7388 Temp = MaybeCreateExprWithCleanups(Temp); 7389 VD->setInit(Temp); 7390 7391 return false; 7392} 7393 7394void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 7395 if (VD->isInvalidDecl()) return; 7396 7397 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 7398 if (ClassDecl->isInvalidDecl()) return; 7399 if (ClassDecl->hasTrivialDestructor()) return; 7400 if (ClassDecl->isDependentContext()) return; 7401 7402 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 7403 MarkDeclarationReferenced(VD->getLocation(), Destructor); 7404 CheckDestructorAccess(VD->getLocation(), Destructor, 7405 PDiag(diag::err_access_dtor_var) 7406 << VD->getDeclName() 7407 << VD->getType()); 7408 7409 if (!VD->hasGlobalStorage()) return; 7410 7411 // Emit warning for non-trivial dtor in global scope (a real global, 7412 // class-static, function-static). 7413 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 7414 7415 // TODO: this should be re-enabled for static locals by !CXAAtExit 7416 if (!VD->isStaticLocal()) 7417 Diag(VD->getLocation(), diag::warn_global_destructor); 7418} 7419 7420/// AddCXXDirectInitializerToDecl - This action is called immediately after 7421/// ActOnDeclarator, when a C++ direct initializer is present. 7422/// e.g: "int x(1);" 7423void Sema::AddCXXDirectInitializerToDecl(Decl *RealDecl, 7424 SourceLocation LParenLoc, 7425 MultiExprArg Exprs, 7426 SourceLocation RParenLoc, 7427 bool TypeMayContainAuto) { 7428 assert(Exprs.size() != 0 && Exprs.get() && "missing expressions"); 7429 7430 // If there is no declaration, there was an error parsing it. Just ignore 7431 // the initializer. 7432 if (RealDecl == 0) 7433 return; 7434 7435 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 7436 if (!VDecl) { 7437 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 7438 RealDecl->setInvalidDecl(); 7439 return; 7440 } 7441 7442 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 7443 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 7444 // FIXME: n3225 doesn't actually seem to indicate this is ill-formed 7445 if (Exprs.size() > 1) { 7446 Diag(Exprs.get()[1]->getSourceRange().getBegin(), 7447 diag::err_auto_var_init_multiple_expressions) 7448 << VDecl->getDeclName() << VDecl->getType() 7449 << VDecl->getSourceRange(); 7450 RealDecl->setInvalidDecl(); 7451 return; 7452 } 7453 7454 Expr *Init = Exprs.get()[0]; 7455 TypeSourceInfo *DeducedType = 0; 7456 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 7457 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 7458 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 7459 << Init->getSourceRange(); 7460 if (!DeducedType) { 7461 RealDecl->setInvalidDecl(); 7462 return; 7463 } 7464 VDecl->setTypeSourceInfo(DeducedType); 7465 VDecl->setType(DeducedType->getType()); 7466 7467 // In ARC, infer lifetime. 7468 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 7469 VDecl->setInvalidDecl(); 7470 7471 // If this is a redeclaration, check that the type we just deduced matches 7472 // the previously declared type. 7473 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 7474 MergeVarDeclTypes(VDecl, Old); 7475 } 7476 7477 // We will represent direct-initialization similarly to copy-initialization: 7478 // int x(1); -as-> int x = 1; 7479 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 7480 // 7481 // Clients that want to distinguish between the two forms, can check for 7482 // direct initializer using VarDecl::hasCXXDirectInitializer(). 7483 // A major benefit is that clients that don't particularly care about which 7484 // exactly form was it (like the CodeGen) can handle both cases without 7485 // special case code. 7486 7487 // C++ 8.5p11: 7488 // The form of initialization (using parentheses or '=') is generally 7489 // insignificant, but does matter when the entity being initialized has a 7490 // class type. 7491 7492 if (!VDecl->getType()->isDependentType() && 7493 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 7494 diag::err_typecheck_decl_incomplete_type)) { 7495 VDecl->setInvalidDecl(); 7496 return; 7497 } 7498 7499 // The variable can not have an abstract class type. 7500 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 7501 diag::err_abstract_type_in_decl, 7502 AbstractVariableType)) 7503 VDecl->setInvalidDecl(); 7504 7505 const VarDecl *Def; 7506 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 7507 Diag(VDecl->getLocation(), diag::err_redefinition) 7508 << VDecl->getDeclName(); 7509 Diag(Def->getLocation(), diag::note_previous_definition); 7510 VDecl->setInvalidDecl(); 7511 return; 7512 } 7513 7514 // C++ [class.static.data]p4 7515 // If a static data member is of const integral or const 7516 // enumeration type, its declaration in the class definition can 7517 // specify a constant-initializer which shall be an integral 7518 // constant expression (5.19). In that case, the member can appear 7519 // in integral constant expressions. The member shall still be 7520 // defined in a namespace scope if it is used in the program and the 7521 // namespace scope definition shall not contain an initializer. 7522 // 7523 // We already performed a redefinition check above, but for static 7524 // data members we also need to check whether there was an in-class 7525 // declaration with an initializer. 7526 const VarDecl* PrevInit = 0; 7527 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 7528 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 7529 Diag(PrevInit->getLocation(), diag::note_previous_definition); 7530 return; 7531 } 7532 7533 bool IsDependent = false; 7534 for (unsigned I = 0, N = Exprs.size(); I != N; ++I) { 7535 if (DiagnoseUnexpandedParameterPack(Exprs.get()[I], UPPC_Expression)) { 7536 VDecl->setInvalidDecl(); 7537 return; 7538 } 7539 7540 if (Exprs.get()[I]->isTypeDependent()) 7541 IsDependent = true; 7542 } 7543 7544 // If either the declaration has a dependent type or if any of the 7545 // expressions is type-dependent, we represent the initialization 7546 // via a ParenListExpr for later use during template instantiation. 7547 if (VDecl->getType()->isDependentType() || IsDependent) { 7548 // Let clients know that initialization was done with a direct initializer. 7549 VDecl->setCXXDirectInitializer(true); 7550 7551 // Store the initialization expressions as a ParenListExpr. 7552 unsigned NumExprs = Exprs.size(); 7553 VDecl->setInit(new (Context) ParenListExpr( 7554 Context, LParenLoc, (Expr **)Exprs.release(), NumExprs, RParenLoc, 7555 VDecl->getType().getNonReferenceType())); 7556 return; 7557 } 7558 7559 // Capture the variable that is being initialized and the style of 7560 // initialization. 7561 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 7562 7563 // FIXME: Poor source location information. 7564 InitializationKind Kind 7565 = InitializationKind::CreateDirect(VDecl->getLocation(), 7566 LParenLoc, RParenLoc); 7567 7568 InitializationSequence InitSeq(*this, Entity, Kind, 7569 Exprs.get(), Exprs.size()); 7570 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, move(Exprs)); 7571 if (Result.isInvalid()) { 7572 VDecl->setInvalidDecl(); 7573 return; 7574 } 7575 7576 CheckImplicitConversions(Result.get(), LParenLoc); 7577 7578 Result = MaybeCreateExprWithCleanups(Result); 7579 VDecl->setInit(Result.takeAs<Expr>()); 7580 VDecl->setCXXDirectInitializer(true); 7581 7582 CheckCompleteVariableDeclaration(VDecl); 7583} 7584 7585/// \brief Given a constructor and the set of arguments provided for the 7586/// constructor, convert the arguments and add any required default arguments 7587/// to form a proper call to this constructor. 7588/// 7589/// \returns true if an error occurred, false otherwise. 7590bool 7591Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 7592 MultiExprArg ArgsPtr, 7593 SourceLocation Loc, 7594 ASTOwningVector<Expr*> &ConvertedArgs) { 7595 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 7596 unsigned NumArgs = ArgsPtr.size(); 7597 Expr **Args = (Expr **)ArgsPtr.get(); 7598 7599 const FunctionProtoType *Proto 7600 = Constructor->getType()->getAs<FunctionProtoType>(); 7601 assert(Proto && "Constructor without a prototype?"); 7602 unsigned NumArgsInProto = Proto->getNumArgs(); 7603 7604 // If too few arguments are available, we'll fill in the rest with defaults. 7605 if (NumArgs < NumArgsInProto) 7606 ConvertedArgs.reserve(NumArgsInProto); 7607 else 7608 ConvertedArgs.reserve(NumArgs); 7609 7610 VariadicCallType CallType = 7611 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 7612 SmallVector<Expr *, 8> AllArgs; 7613 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 7614 Proto, 0, Args, NumArgs, AllArgs, 7615 CallType); 7616 for (unsigned i =0, size = AllArgs.size(); i < size; i++) 7617 ConvertedArgs.push_back(AllArgs[i]); 7618 return Invalid; 7619} 7620 7621static inline bool 7622CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 7623 const FunctionDecl *FnDecl) { 7624 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 7625 if (isa<NamespaceDecl>(DC)) { 7626 return SemaRef.Diag(FnDecl->getLocation(), 7627 diag::err_operator_new_delete_declared_in_namespace) 7628 << FnDecl->getDeclName(); 7629 } 7630 7631 if (isa<TranslationUnitDecl>(DC) && 7632 FnDecl->getStorageClass() == SC_Static) { 7633 return SemaRef.Diag(FnDecl->getLocation(), 7634 diag::err_operator_new_delete_declared_static) 7635 << FnDecl->getDeclName(); 7636 } 7637 7638 return false; 7639} 7640 7641static inline bool 7642CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 7643 CanQualType ExpectedResultType, 7644 CanQualType ExpectedFirstParamType, 7645 unsigned DependentParamTypeDiag, 7646 unsigned InvalidParamTypeDiag) { 7647 QualType ResultType = 7648 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 7649 7650 // Check that the result type is not dependent. 7651 if (ResultType->isDependentType()) 7652 return SemaRef.Diag(FnDecl->getLocation(), 7653 diag::err_operator_new_delete_dependent_result_type) 7654 << FnDecl->getDeclName() << ExpectedResultType; 7655 7656 // Check that the result type is what we expect. 7657 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 7658 return SemaRef.Diag(FnDecl->getLocation(), 7659 diag::err_operator_new_delete_invalid_result_type) 7660 << FnDecl->getDeclName() << ExpectedResultType; 7661 7662 // A function template must have at least 2 parameters. 7663 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 7664 return SemaRef.Diag(FnDecl->getLocation(), 7665 diag::err_operator_new_delete_template_too_few_parameters) 7666 << FnDecl->getDeclName(); 7667 7668 // The function decl must have at least 1 parameter. 7669 if (FnDecl->getNumParams() == 0) 7670 return SemaRef.Diag(FnDecl->getLocation(), 7671 diag::err_operator_new_delete_too_few_parameters) 7672 << FnDecl->getDeclName(); 7673 7674 // Check the the first parameter type is not dependent. 7675 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 7676 if (FirstParamType->isDependentType()) 7677 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 7678 << FnDecl->getDeclName() << ExpectedFirstParamType; 7679 7680 // Check that the first parameter type is what we expect. 7681 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 7682 ExpectedFirstParamType) 7683 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 7684 << FnDecl->getDeclName() << ExpectedFirstParamType; 7685 7686 return false; 7687} 7688 7689static bool 7690CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7691 // C++ [basic.stc.dynamic.allocation]p1: 7692 // A program is ill-formed if an allocation function is declared in a 7693 // namespace scope other than global scope or declared static in global 7694 // scope. 7695 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7696 return true; 7697 7698 CanQualType SizeTy = 7699 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 7700 7701 // C++ [basic.stc.dynamic.allocation]p1: 7702 // The return type shall be void*. The first parameter shall have type 7703 // std::size_t. 7704 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 7705 SizeTy, 7706 diag::err_operator_new_dependent_param_type, 7707 diag::err_operator_new_param_type)) 7708 return true; 7709 7710 // C++ [basic.stc.dynamic.allocation]p1: 7711 // The first parameter shall not have an associated default argument. 7712 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 7713 return SemaRef.Diag(FnDecl->getLocation(), 7714 diag::err_operator_new_default_arg) 7715 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 7716 7717 return false; 7718} 7719 7720static bool 7721CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 7722 // C++ [basic.stc.dynamic.deallocation]p1: 7723 // A program is ill-formed if deallocation functions are declared in a 7724 // namespace scope other than global scope or declared static in global 7725 // scope. 7726 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 7727 return true; 7728 7729 // C++ [basic.stc.dynamic.deallocation]p2: 7730 // Each deallocation function shall return void and its first parameter 7731 // shall be void*. 7732 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 7733 SemaRef.Context.VoidPtrTy, 7734 diag::err_operator_delete_dependent_param_type, 7735 diag::err_operator_delete_param_type)) 7736 return true; 7737 7738 return false; 7739} 7740 7741/// CheckOverloadedOperatorDeclaration - Check whether the declaration 7742/// of this overloaded operator is well-formed. If so, returns false; 7743/// otherwise, emits appropriate diagnostics and returns true. 7744bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 7745 assert(FnDecl && FnDecl->isOverloadedOperator() && 7746 "Expected an overloaded operator declaration"); 7747 7748 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 7749 7750 // C++ [over.oper]p5: 7751 // The allocation and deallocation functions, operator new, 7752 // operator new[], operator delete and operator delete[], are 7753 // described completely in 3.7.3. The attributes and restrictions 7754 // found in the rest of this subclause do not apply to them unless 7755 // explicitly stated in 3.7.3. 7756 if (Op == OO_Delete || Op == OO_Array_Delete) 7757 return CheckOperatorDeleteDeclaration(*this, FnDecl); 7758 7759 if (Op == OO_New || Op == OO_Array_New) 7760 return CheckOperatorNewDeclaration(*this, FnDecl); 7761 7762 // C++ [over.oper]p6: 7763 // An operator function shall either be a non-static member 7764 // function or be a non-member function and have at least one 7765 // parameter whose type is a class, a reference to a class, an 7766 // enumeration, or a reference to an enumeration. 7767 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 7768 if (MethodDecl->isStatic()) 7769 return Diag(FnDecl->getLocation(), 7770 diag::err_operator_overload_static) << FnDecl->getDeclName(); 7771 } else { 7772 bool ClassOrEnumParam = false; 7773 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 7774 ParamEnd = FnDecl->param_end(); 7775 Param != ParamEnd; ++Param) { 7776 QualType ParamType = (*Param)->getType().getNonReferenceType(); 7777 if (ParamType->isDependentType() || ParamType->isRecordType() || 7778 ParamType->isEnumeralType()) { 7779 ClassOrEnumParam = true; 7780 break; 7781 } 7782 } 7783 7784 if (!ClassOrEnumParam) 7785 return Diag(FnDecl->getLocation(), 7786 diag::err_operator_overload_needs_class_or_enum) 7787 << FnDecl->getDeclName(); 7788 } 7789 7790 // C++ [over.oper]p8: 7791 // An operator function cannot have default arguments (8.3.6), 7792 // except where explicitly stated below. 7793 // 7794 // Only the function-call operator allows default arguments 7795 // (C++ [over.call]p1). 7796 if (Op != OO_Call) { 7797 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7798 Param != FnDecl->param_end(); ++Param) { 7799 if ((*Param)->hasDefaultArg()) 7800 return Diag((*Param)->getLocation(), 7801 diag::err_operator_overload_default_arg) 7802 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 7803 } 7804 } 7805 7806 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 7807 { false, false, false } 7808#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 7809 , { Unary, Binary, MemberOnly } 7810#include "clang/Basic/OperatorKinds.def" 7811 }; 7812 7813 bool CanBeUnaryOperator = OperatorUses[Op][0]; 7814 bool CanBeBinaryOperator = OperatorUses[Op][1]; 7815 bool MustBeMemberOperator = OperatorUses[Op][2]; 7816 7817 // C++ [over.oper]p8: 7818 // [...] Operator functions cannot have more or fewer parameters 7819 // than the number required for the corresponding operator, as 7820 // described in the rest of this subclause. 7821 unsigned NumParams = FnDecl->getNumParams() 7822 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 7823 if (Op != OO_Call && 7824 ((NumParams == 1 && !CanBeUnaryOperator) || 7825 (NumParams == 2 && !CanBeBinaryOperator) || 7826 (NumParams < 1) || (NumParams > 2))) { 7827 // We have the wrong number of parameters. 7828 unsigned ErrorKind; 7829 if (CanBeUnaryOperator && CanBeBinaryOperator) { 7830 ErrorKind = 2; // 2 -> unary or binary. 7831 } else if (CanBeUnaryOperator) { 7832 ErrorKind = 0; // 0 -> unary 7833 } else { 7834 assert(CanBeBinaryOperator && 7835 "All non-call overloaded operators are unary or binary!"); 7836 ErrorKind = 1; // 1 -> binary 7837 } 7838 7839 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 7840 << FnDecl->getDeclName() << NumParams << ErrorKind; 7841 } 7842 7843 // Overloaded operators other than operator() cannot be variadic. 7844 if (Op != OO_Call && 7845 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 7846 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 7847 << FnDecl->getDeclName(); 7848 } 7849 7850 // Some operators must be non-static member functions. 7851 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 7852 return Diag(FnDecl->getLocation(), 7853 diag::err_operator_overload_must_be_member) 7854 << FnDecl->getDeclName(); 7855 } 7856 7857 // C++ [over.inc]p1: 7858 // The user-defined function called operator++ implements the 7859 // prefix and postfix ++ operator. If this function is a member 7860 // function with no parameters, or a non-member function with one 7861 // parameter of class or enumeration type, it defines the prefix 7862 // increment operator ++ for objects of that type. If the function 7863 // is a member function with one parameter (which shall be of type 7864 // int) or a non-member function with two parameters (the second 7865 // of which shall be of type int), it defines the postfix 7866 // increment operator ++ for objects of that type. 7867 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 7868 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 7869 bool ParamIsInt = false; 7870 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 7871 ParamIsInt = BT->getKind() == BuiltinType::Int; 7872 7873 if (!ParamIsInt) 7874 return Diag(LastParam->getLocation(), 7875 diag::err_operator_overload_post_incdec_must_be_int) 7876 << LastParam->getType() << (Op == OO_MinusMinus); 7877 } 7878 7879 return false; 7880} 7881 7882/// CheckLiteralOperatorDeclaration - Check whether the declaration 7883/// of this literal operator function is well-formed. If so, returns 7884/// false; otherwise, emits appropriate diagnostics and returns true. 7885bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 7886 DeclContext *DC = FnDecl->getDeclContext(); 7887 Decl::Kind Kind = DC->getDeclKind(); 7888 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 7889 Kind != Decl::LinkageSpec) { 7890 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 7891 << FnDecl->getDeclName(); 7892 return true; 7893 } 7894 7895 bool Valid = false; 7896 7897 // template <char...> type operator "" name() is the only valid template 7898 // signature, and the only valid signature with no parameters. 7899 if (FnDecl->param_size() == 0) { 7900 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 7901 // Must have only one template parameter 7902 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 7903 if (Params->size() == 1) { 7904 NonTypeTemplateParmDecl *PmDecl = 7905 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 7906 7907 // The template parameter must be a char parameter pack. 7908 if (PmDecl && PmDecl->isTemplateParameterPack() && 7909 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 7910 Valid = true; 7911 } 7912 } 7913 } else { 7914 // Check the first parameter 7915 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 7916 7917 QualType T = (*Param)->getType(); 7918 7919 // unsigned long long int, long double, and any character type are allowed 7920 // as the only parameters. 7921 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 7922 Context.hasSameType(T, Context.LongDoubleTy) || 7923 Context.hasSameType(T, Context.CharTy) || 7924 Context.hasSameType(T, Context.WCharTy) || 7925 Context.hasSameType(T, Context.Char16Ty) || 7926 Context.hasSameType(T, Context.Char32Ty)) { 7927 if (++Param == FnDecl->param_end()) 7928 Valid = true; 7929 goto FinishedParams; 7930 } 7931 7932 // Otherwise it must be a pointer to const; let's strip those qualifiers. 7933 const PointerType *PT = T->getAs<PointerType>(); 7934 if (!PT) 7935 goto FinishedParams; 7936 T = PT->getPointeeType(); 7937 if (!T.isConstQualified()) 7938 goto FinishedParams; 7939 T = T.getUnqualifiedType(); 7940 7941 // Move on to the second parameter; 7942 ++Param; 7943 7944 // If there is no second parameter, the first must be a const char * 7945 if (Param == FnDecl->param_end()) { 7946 if (Context.hasSameType(T, Context.CharTy)) 7947 Valid = true; 7948 goto FinishedParams; 7949 } 7950 7951 // const char *, const wchar_t*, const char16_t*, and const char32_t* 7952 // are allowed as the first parameter to a two-parameter function 7953 if (!(Context.hasSameType(T, Context.CharTy) || 7954 Context.hasSameType(T, Context.WCharTy) || 7955 Context.hasSameType(T, Context.Char16Ty) || 7956 Context.hasSameType(T, Context.Char32Ty))) 7957 goto FinishedParams; 7958 7959 // The second and final parameter must be an std::size_t 7960 T = (*Param)->getType().getUnqualifiedType(); 7961 if (Context.hasSameType(T, Context.getSizeType()) && 7962 ++Param == FnDecl->param_end()) 7963 Valid = true; 7964 } 7965 7966 // FIXME: This diagnostic is absolutely terrible. 7967FinishedParams: 7968 if (!Valid) { 7969 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 7970 << FnDecl->getDeclName(); 7971 return true; 7972 } 7973 7974 return false; 7975} 7976 7977/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 7978/// linkage specification, including the language and (if present) 7979/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 7980/// the location of the language string literal, which is provided 7981/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 7982/// the '{' brace. Otherwise, this linkage specification does not 7983/// have any braces. 7984Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 7985 SourceLocation LangLoc, 7986 StringRef Lang, 7987 SourceLocation LBraceLoc) { 7988 LinkageSpecDecl::LanguageIDs Language; 7989 if (Lang == "\"C\"") 7990 Language = LinkageSpecDecl::lang_c; 7991 else if (Lang == "\"C++\"") 7992 Language = LinkageSpecDecl::lang_cxx; 7993 else { 7994 Diag(LangLoc, diag::err_bad_language); 7995 return 0; 7996 } 7997 7998 // FIXME: Add all the various semantics of linkage specifications 7999 8000 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 8001 ExternLoc, LangLoc, Language); 8002 CurContext->addDecl(D); 8003 PushDeclContext(S, D); 8004 return D; 8005} 8006 8007/// ActOnFinishLinkageSpecification - Complete the definition of 8008/// the C++ linkage specification LinkageSpec. If RBraceLoc is 8009/// valid, it's the position of the closing '}' brace in a linkage 8010/// specification that uses braces. 8011Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 8012 Decl *LinkageSpec, 8013 SourceLocation RBraceLoc) { 8014 if (LinkageSpec) { 8015 if (RBraceLoc.isValid()) { 8016 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 8017 LSDecl->setRBraceLoc(RBraceLoc); 8018 } 8019 PopDeclContext(); 8020 } 8021 return LinkageSpec; 8022} 8023 8024/// \brief Perform semantic analysis for the variable declaration that 8025/// occurs within a C++ catch clause, returning the newly-created 8026/// variable. 8027VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 8028 TypeSourceInfo *TInfo, 8029 SourceLocation StartLoc, 8030 SourceLocation Loc, 8031 IdentifierInfo *Name) { 8032 bool Invalid = false; 8033 QualType ExDeclType = TInfo->getType(); 8034 8035 // Arrays and functions decay. 8036 if (ExDeclType->isArrayType()) 8037 ExDeclType = Context.getArrayDecayedType(ExDeclType); 8038 else if (ExDeclType->isFunctionType()) 8039 ExDeclType = Context.getPointerType(ExDeclType); 8040 8041 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 8042 // The exception-declaration shall not denote a pointer or reference to an 8043 // incomplete type, other than [cv] void*. 8044 // N2844 forbids rvalue references. 8045 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 8046 Diag(Loc, diag::err_catch_rvalue_ref); 8047 Invalid = true; 8048 } 8049 8050 // GCC allows catching pointers and references to incomplete types 8051 // as an extension; so do we, but we warn by default. 8052 8053 QualType BaseType = ExDeclType; 8054 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 8055 unsigned DK = diag::err_catch_incomplete; 8056 bool IncompleteCatchIsInvalid = true; 8057 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 8058 BaseType = Ptr->getPointeeType(); 8059 Mode = 1; 8060 DK = diag::ext_catch_incomplete_ptr; 8061 IncompleteCatchIsInvalid = false; 8062 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 8063 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 8064 BaseType = Ref->getPointeeType(); 8065 Mode = 2; 8066 DK = diag::ext_catch_incomplete_ref; 8067 IncompleteCatchIsInvalid = false; 8068 } 8069 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 8070 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK) && 8071 IncompleteCatchIsInvalid) 8072 Invalid = true; 8073 8074 if (!Invalid && !ExDeclType->isDependentType() && 8075 RequireNonAbstractType(Loc, ExDeclType, 8076 diag::err_abstract_type_in_decl, 8077 AbstractVariableType)) 8078 Invalid = true; 8079 8080 // Only the non-fragile NeXT runtime currently supports C++ catches 8081 // of ObjC types, and no runtime supports catching ObjC types by value. 8082 if (!Invalid && getLangOptions().ObjC1) { 8083 QualType T = ExDeclType; 8084 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 8085 T = RT->getPointeeType(); 8086 8087 if (T->isObjCObjectType()) { 8088 Diag(Loc, diag::err_objc_object_catch); 8089 Invalid = true; 8090 } else if (T->isObjCObjectPointerType()) { 8091 if (!getLangOptions().ObjCNonFragileABI) 8092 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 8093 } 8094 } 8095 8096 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 8097 ExDeclType, TInfo, SC_None, SC_None); 8098 ExDecl->setExceptionVariable(true); 8099 8100 if (!Invalid && !ExDeclType->isDependentType()) { 8101 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 8102 // C++ [except.handle]p16: 8103 // The object declared in an exception-declaration or, if the 8104 // exception-declaration does not specify a name, a temporary (12.2) is 8105 // copy-initialized (8.5) from the exception object. [...] 8106 // The object is destroyed when the handler exits, after the destruction 8107 // of any automatic objects initialized within the handler. 8108 // 8109 // We just pretend to initialize the object with itself, then make sure 8110 // it can be destroyed later. 8111 QualType initType = ExDeclType; 8112 8113 InitializedEntity entity = 8114 InitializedEntity::InitializeVariable(ExDecl); 8115 InitializationKind initKind = 8116 InitializationKind::CreateCopy(Loc, SourceLocation()); 8117 8118 Expr *opaqueValue = 8119 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 8120 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 8121 ExprResult result = sequence.Perform(*this, entity, initKind, 8122 MultiExprArg(&opaqueValue, 1)); 8123 if (result.isInvalid()) 8124 Invalid = true; 8125 else { 8126 // If the constructor used was non-trivial, set this as the 8127 // "initializer". 8128 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 8129 if (!construct->getConstructor()->isTrivial()) { 8130 Expr *init = MaybeCreateExprWithCleanups(construct); 8131 ExDecl->setInit(init); 8132 } 8133 8134 // And make sure it's destructable. 8135 FinalizeVarWithDestructor(ExDecl, recordType); 8136 } 8137 } 8138 } 8139 8140 if (Invalid) 8141 ExDecl->setInvalidDecl(); 8142 8143 return ExDecl; 8144} 8145 8146/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 8147/// handler. 8148Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 8149 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8150 bool Invalid = D.isInvalidType(); 8151 8152 // Check for unexpanded parameter packs. 8153 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8154 UPPC_ExceptionType)) { 8155 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 8156 D.getIdentifierLoc()); 8157 Invalid = true; 8158 } 8159 8160 IdentifierInfo *II = D.getIdentifier(); 8161 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 8162 LookupOrdinaryName, 8163 ForRedeclaration)) { 8164 // The scope should be freshly made just for us. There is just no way 8165 // it contains any previous declaration. 8166 assert(!S->isDeclScope(PrevDecl)); 8167 if (PrevDecl->isTemplateParameter()) { 8168 // Maybe we will complain about the shadowed template parameter. 8169 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8170 } 8171 } 8172 8173 if (D.getCXXScopeSpec().isSet() && !Invalid) { 8174 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 8175 << D.getCXXScopeSpec().getRange(); 8176 Invalid = true; 8177 } 8178 8179 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 8180 D.getSourceRange().getBegin(), 8181 D.getIdentifierLoc(), 8182 D.getIdentifier()); 8183 if (Invalid) 8184 ExDecl->setInvalidDecl(); 8185 8186 // Add the exception declaration into this scope. 8187 if (II) 8188 PushOnScopeChains(ExDecl, S); 8189 else 8190 CurContext->addDecl(ExDecl); 8191 8192 ProcessDeclAttributes(S, ExDecl, D); 8193 return ExDecl; 8194} 8195 8196Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 8197 Expr *AssertExpr, 8198 Expr *AssertMessageExpr_, 8199 SourceLocation RParenLoc) { 8200 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 8201 8202 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 8203 llvm::APSInt Value(32); 8204 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 8205 Diag(StaticAssertLoc, 8206 diag::err_static_assert_expression_is_not_constant) << 8207 AssertExpr->getSourceRange(); 8208 return 0; 8209 } 8210 8211 if (Value == 0) { 8212 Diag(StaticAssertLoc, diag::err_static_assert_failed) 8213 << AssertMessage->getString() << AssertExpr->getSourceRange(); 8214 } 8215 } 8216 8217 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 8218 return 0; 8219 8220 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 8221 AssertExpr, AssertMessage, RParenLoc); 8222 8223 CurContext->addDecl(Decl); 8224 return Decl; 8225} 8226 8227/// \brief Perform semantic analysis of the given friend type declaration. 8228/// 8229/// \returns A friend declaration that. 8230FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation FriendLoc, 8231 TypeSourceInfo *TSInfo) { 8232 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 8233 8234 QualType T = TSInfo->getType(); 8235 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 8236 8237 if (!getLangOptions().CPlusPlus0x) { 8238 // C++03 [class.friend]p2: 8239 // An elaborated-type-specifier shall be used in a friend declaration 8240 // for a class.* 8241 // 8242 // * The class-key of the elaborated-type-specifier is required. 8243 if (!ActiveTemplateInstantiations.empty()) { 8244 // Do not complain about the form of friend template types during 8245 // template instantiation; we will already have complained when the 8246 // template was declared. 8247 } else if (!T->isElaboratedTypeSpecifier()) { 8248 // If we evaluated the type to a record type, suggest putting 8249 // a tag in front. 8250 if (const RecordType *RT = T->getAs<RecordType>()) { 8251 RecordDecl *RD = RT->getDecl(); 8252 8253 std::string InsertionText = std::string(" ") + RD->getKindName(); 8254 8255 Diag(TypeRange.getBegin(), diag::ext_unelaborated_friend_type) 8256 << (unsigned) RD->getTagKind() 8257 << T 8258 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 8259 InsertionText); 8260 } else { 8261 Diag(FriendLoc, diag::ext_nonclass_type_friend) 8262 << T 8263 << SourceRange(FriendLoc, TypeRange.getEnd()); 8264 } 8265 } else if (T->getAs<EnumType>()) { 8266 Diag(FriendLoc, diag::ext_enum_friend) 8267 << T 8268 << SourceRange(FriendLoc, TypeRange.getEnd()); 8269 } 8270 } 8271 8272 // C++0x [class.friend]p3: 8273 // If the type specifier in a friend declaration designates a (possibly 8274 // cv-qualified) class type, that class is declared as a friend; otherwise, 8275 // the friend declaration is ignored. 8276 8277 // FIXME: C++0x has some syntactic restrictions on friend type declarations 8278 // in [class.friend]p3 that we do not implement. 8279 8280 return FriendDecl::Create(Context, CurContext, FriendLoc, TSInfo, FriendLoc); 8281} 8282 8283/// Handle a friend tag declaration where the scope specifier was 8284/// templated. 8285Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 8286 unsigned TagSpec, SourceLocation TagLoc, 8287 CXXScopeSpec &SS, 8288 IdentifierInfo *Name, SourceLocation NameLoc, 8289 AttributeList *Attr, 8290 MultiTemplateParamsArg TempParamLists) { 8291 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 8292 8293 bool isExplicitSpecialization = false; 8294 bool Invalid = false; 8295 8296 if (TemplateParameterList *TemplateParams 8297 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 8298 TempParamLists.get(), 8299 TempParamLists.size(), 8300 /*friend*/ true, 8301 isExplicitSpecialization, 8302 Invalid)) { 8303 if (TemplateParams->size() > 0) { 8304 // This is a declaration of a class template. 8305 if (Invalid) 8306 return 0; 8307 8308 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 8309 SS, Name, NameLoc, Attr, 8310 TemplateParams, AS_public, 8311 TempParamLists.size() - 1, 8312 (TemplateParameterList**) TempParamLists.release()).take(); 8313 } else { 8314 // The "template<>" header is extraneous. 8315 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 8316 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 8317 isExplicitSpecialization = true; 8318 } 8319 } 8320 8321 if (Invalid) return 0; 8322 8323 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 8324 8325 bool isAllExplicitSpecializations = true; 8326 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 8327 if (TempParamLists.get()[I]->size()) { 8328 isAllExplicitSpecializations = false; 8329 break; 8330 } 8331 } 8332 8333 // FIXME: don't ignore attributes. 8334 8335 // If it's explicit specializations all the way down, just forget 8336 // about the template header and build an appropriate non-templated 8337 // friend. TODO: for source fidelity, remember the headers. 8338 if (isAllExplicitSpecializations) { 8339 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 8340 ElaboratedTypeKeyword Keyword 8341 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8342 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 8343 *Name, NameLoc); 8344 if (T.isNull()) 8345 return 0; 8346 8347 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8348 if (isa<DependentNameType>(T)) { 8349 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8350 TL.setKeywordLoc(TagLoc); 8351 TL.setQualifierLoc(QualifierLoc); 8352 TL.setNameLoc(NameLoc); 8353 } else { 8354 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 8355 TL.setKeywordLoc(TagLoc); 8356 TL.setQualifierLoc(QualifierLoc); 8357 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 8358 } 8359 8360 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8361 TSI, FriendLoc); 8362 Friend->setAccess(AS_public); 8363 CurContext->addDecl(Friend); 8364 return Friend; 8365 } 8366 8367 // Handle the case of a templated-scope friend class. e.g. 8368 // template <class T> class A<T>::B; 8369 // FIXME: we don't support these right now. 8370 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 8371 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 8372 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 8373 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 8374 TL.setKeywordLoc(TagLoc); 8375 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 8376 TL.setNameLoc(NameLoc); 8377 8378 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 8379 TSI, FriendLoc); 8380 Friend->setAccess(AS_public); 8381 Friend->setUnsupportedFriend(true); 8382 CurContext->addDecl(Friend); 8383 return Friend; 8384} 8385 8386 8387/// Handle a friend type declaration. This works in tandem with 8388/// ActOnTag. 8389/// 8390/// Notes on friend class templates: 8391/// 8392/// We generally treat friend class declarations as if they were 8393/// declaring a class. So, for example, the elaborated type specifier 8394/// in a friend declaration is required to obey the restrictions of a 8395/// class-head (i.e. no typedefs in the scope chain), template 8396/// parameters are required to match up with simple template-ids, &c. 8397/// However, unlike when declaring a template specialization, it's 8398/// okay to refer to a template specialization without an empty 8399/// template parameter declaration, e.g. 8400/// friend class A<T>::B<unsigned>; 8401/// We permit this as a special case; if there are any template 8402/// parameters present at all, require proper matching, i.e. 8403/// template <> template <class T> friend class A<int>::B; 8404Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 8405 MultiTemplateParamsArg TempParams) { 8406 SourceLocation Loc = DS.getSourceRange().getBegin(); 8407 8408 assert(DS.isFriendSpecified()); 8409 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8410 8411 // Try to convert the decl specifier to a type. This works for 8412 // friend templates because ActOnTag never produces a ClassTemplateDecl 8413 // for a TUK_Friend. 8414 Declarator TheDeclarator(DS, Declarator::MemberContext); 8415 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 8416 QualType T = TSI->getType(); 8417 if (TheDeclarator.isInvalidType()) 8418 return 0; 8419 8420 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 8421 return 0; 8422 8423 // This is definitely an error in C++98. It's probably meant to 8424 // be forbidden in C++0x, too, but the specification is just 8425 // poorly written. 8426 // 8427 // The problem is with declarations like the following: 8428 // template <T> friend A<T>::foo; 8429 // where deciding whether a class C is a friend or not now hinges 8430 // on whether there exists an instantiation of A that causes 8431 // 'foo' to equal C. There are restrictions on class-heads 8432 // (which we declare (by fiat) elaborated friend declarations to 8433 // be) that makes this tractable. 8434 // 8435 // FIXME: handle "template <> friend class A<T>;", which 8436 // is possibly well-formed? Who even knows? 8437 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 8438 Diag(Loc, diag::err_tagless_friend_type_template) 8439 << DS.getSourceRange(); 8440 return 0; 8441 } 8442 8443 // C++98 [class.friend]p1: A friend of a class is a function 8444 // or class that is not a member of the class . . . 8445 // This is fixed in DR77, which just barely didn't make the C++03 8446 // deadline. It's also a very silly restriction that seriously 8447 // affects inner classes and which nobody else seems to implement; 8448 // thus we never diagnose it, not even in -pedantic. 8449 // 8450 // But note that we could warn about it: it's always useless to 8451 // friend one of your own members (it's not, however, worthless to 8452 // friend a member of an arbitrary specialization of your template). 8453 8454 Decl *D; 8455 if (unsigned NumTempParamLists = TempParams.size()) 8456 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 8457 NumTempParamLists, 8458 TempParams.release(), 8459 TSI, 8460 DS.getFriendSpecLoc()); 8461 else 8462 D = CheckFriendTypeDecl(DS.getFriendSpecLoc(), TSI); 8463 8464 if (!D) 8465 return 0; 8466 8467 D->setAccess(AS_public); 8468 CurContext->addDecl(D); 8469 8470 return D; 8471} 8472 8473Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, bool IsDefinition, 8474 MultiTemplateParamsArg TemplateParams) { 8475 const DeclSpec &DS = D.getDeclSpec(); 8476 8477 assert(DS.isFriendSpecified()); 8478 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 8479 8480 SourceLocation Loc = D.getIdentifierLoc(); 8481 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8482 QualType T = TInfo->getType(); 8483 8484 // C++ [class.friend]p1 8485 // A friend of a class is a function or class.... 8486 // Note that this sees through typedefs, which is intended. 8487 // It *doesn't* see through dependent types, which is correct 8488 // according to [temp.arg.type]p3: 8489 // If a declaration acquires a function type through a 8490 // type dependent on a template-parameter and this causes 8491 // a declaration that does not use the syntactic form of a 8492 // function declarator to have a function type, the program 8493 // is ill-formed. 8494 if (!T->isFunctionType()) { 8495 Diag(Loc, diag::err_unexpected_friend); 8496 8497 // It might be worthwhile to try to recover by creating an 8498 // appropriate declaration. 8499 return 0; 8500 } 8501 8502 // C++ [namespace.memdef]p3 8503 // - If a friend declaration in a non-local class first declares a 8504 // class or function, the friend class or function is a member 8505 // of the innermost enclosing namespace. 8506 // - The name of the friend is not found by simple name lookup 8507 // until a matching declaration is provided in that namespace 8508 // scope (either before or after the class declaration granting 8509 // friendship). 8510 // - If a friend function is called, its name may be found by the 8511 // name lookup that considers functions from namespaces and 8512 // classes associated with the types of the function arguments. 8513 // - When looking for a prior declaration of a class or a function 8514 // declared as a friend, scopes outside the innermost enclosing 8515 // namespace scope are not considered. 8516 8517 CXXScopeSpec &SS = D.getCXXScopeSpec(); 8518 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 8519 DeclarationName Name = NameInfo.getName(); 8520 assert(Name); 8521 8522 // Check for unexpanded parameter packs. 8523 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 8524 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 8525 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 8526 return 0; 8527 8528 // The context we found the declaration in, or in which we should 8529 // create the declaration. 8530 DeclContext *DC; 8531 Scope *DCScope = S; 8532 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 8533 ForRedeclaration); 8534 8535 // FIXME: there are different rules in local classes 8536 8537 // There are four cases here. 8538 // - There's no scope specifier, in which case we just go to the 8539 // appropriate scope and look for a function or function template 8540 // there as appropriate. 8541 // Recover from invalid scope qualifiers as if they just weren't there. 8542 if (SS.isInvalid() || !SS.isSet()) { 8543 // C++0x [namespace.memdef]p3: 8544 // If the name in a friend declaration is neither qualified nor 8545 // a template-id and the declaration is a function or an 8546 // elaborated-type-specifier, the lookup to determine whether 8547 // the entity has been previously declared shall not consider 8548 // any scopes outside the innermost enclosing namespace. 8549 // C++0x [class.friend]p11: 8550 // If a friend declaration appears in a local class and the name 8551 // specified is an unqualified name, a prior declaration is 8552 // looked up without considering scopes that are outside the 8553 // innermost enclosing non-class scope. For a friend function 8554 // declaration, if there is no prior declaration, the program is 8555 // ill-formed. 8556 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 8557 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 8558 8559 // Find the appropriate context according to the above. 8560 DC = CurContext; 8561 while (true) { 8562 // Skip class contexts. If someone can cite chapter and verse 8563 // for this behavior, that would be nice --- it's what GCC and 8564 // EDG do, and it seems like a reasonable intent, but the spec 8565 // really only says that checks for unqualified existing 8566 // declarations should stop at the nearest enclosing namespace, 8567 // not that they should only consider the nearest enclosing 8568 // namespace. 8569 while (DC->isRecord()) 8570 DC = DC->getParent(); 8571 8572 LookupQualifiedName(Previous, DC); 8573 8574 // TODO: decide what we think about using declarations. 8575 if (isLocal || !Previous.empty()) 8576 break; 8577 8578 if (isTemplateId) { 8579 if (isa<TranslationUnitDecl>(DC)) break; 8580 } else { 8581 if (DC->isFileContext()) break; 8582 } 8583 DC = DC->getParent(); 8584 } 8585 8586 // C++ [class.friend]p1: A friend of a class is a function or 8587 // class that is not a member of the class . . . 8588 // C++0x changes this for both friend types and functions. 8589 // Most C++ 98 compilers do seem to give an error here, so 8590 // we do, too. 8591 if (!Previous.empty() && DC->Equals(CurContext) 8592 && !getLangOptions().CPlusPlus0x) 8593 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8594 8595 DCScope = getScopeForDeclContext(S, DC); 8596 8597 // - There's a non-dependent scope specifier, in which case we 8598 // compute it and do a previous lookup there for a function 8599 // or function template. 8600 } else if (!SS.getScopeRep()->isDependent()) { 8601 DC = computeDeclContext(SS); 8602 if (!DC) return 0; 8603 8604 if (RequireCompleteDeclContext(SS, DC)) return 0; 8605 8606 LookupQualifiedName(Previous, DC); 8607 8608 // Ignore things found implicitly in the wrong scope. 8609 // TODO: better diagnostics for this case. Suggesting the right 8610 // qualified scope would be nice... 8611 LookupResult::Filter F = Previous.makeFilter(); 8612 while (F.hasNext()) { 8613 NamedDecl *D = F.next(); 8614 if (!DC->InEnclosingNamespaceSetOf( 8615 D->getDeclContext()->getRedeclContext())) 8616 F.erase(); 8617 } 8618 F.done(); 8619 8620 if (Previous.empty()) { 8621 D.setInvalidType(); 8622 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 8623 return 0; 8624 } 8625 8626 // C++ [class.friend]p1: A friend of a class is a function or 8627 // class that is not a member of the class . . . 8628 if (DC->Equals(CurContext)) 8629 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 8630 8631 // - There's a scope specifier that does not match any template 8632 // parameter lists, in which case we use some arbitrary context, 8633 // create a method or method template, and wait for instantiation. 8634 // - There's a scope specifier that does match some template 8635 // parameter lists, which we don't handle right now. 8636 } else { 8637 DC = CurContext; 8638 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 8639 } 8640 8641 if (!DC->isRecord()) { 8642 // This implies that it has to be an operator or function. 8643 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 8644 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 8645 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 8646 Diag(Loc, diag::err_introducing_special_friend) << 8647 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 8648 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 8649 return 0; 8650 } 8651 } 8652 8653 bool Redeclaration = false; 8654 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, T, TInfo, Previous, 8655 move(TemplateParams), 8656 IsDefinition, 8657 Redeclaration); 8658 if (!ND) return 0; 8659 8660 assert(ND->getDeclContext() == DC); 8661 assert(ND->getLexicalDeclContext() == CurContext); 8662 8663 // Add the function declaration to the appropriate lookup tables, 8664 // adjusting the redeclarations list as necessary. We don't 8665 // want to do this yet if the friending class is dependent. 8666 // 8667 // Also update the scope-based lookup if the target context's 8668 // lookup context is in lexical scope. 8669 if (!CurContext->isDependentContext()) { 8670 DC = DC->getRedeclContext(); 8671 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 8672 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8673 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 8674 } 8675 8676 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 8677 D.getIdentifierLoc(), ND, 8678 DS.getFriendSpecLoc()); 8679 FrD->setAccess(AS_public); 8680 CurContext->addDecl(FrD); 8681 8682 if (ND->isInvalidDecl()) 8683 FrD->setInvalidDecl(); 8684 else { 8685 FunctionDecl *FD; 8686 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 8687 FD = FTD->getTemplatedDecl(); 8688 else 8689 FD = cast<FunctionDecl>(ND); 8690 8691 // Mark templated-scope function declarations as unsupported. 8692 if (FD->getNumTemplateParameterLists()) 8693 FrD->setUnsupportedFriend(true); 8694 } 8695 8696 return ND; 8697} 8698 8699void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 8700 AdjustDeclIfTemplate(Dcl); 8701 8702 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 8703 if (!Fn) { 8704 Diag(DelLoc, diag::err_deleted_non_function); 8705 return; 8706 } 8707 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 8708 Diag(DelLoc, diag::err_deleted_decl_not_first); 8709 Diag(Prev->getLocation(), diag::note_previous_declaration); 8710 // If the declaration wasn't the first, we delete the function anyway for 8711 // recovery. 8712 } 8713 Fn->setDeletedAsWritten(); 8714} 8715 8716void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 8717 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 8718 8719 if (MD) { 8720 if (MD->getParent()->isDependentType()) { 8721 MD->setDefaulted(); 8722 MD->setExplicitlyDefaulted(); 8723 return; 8724 } 8725 8726 CXXSpecialMember Member = getSpecialMember(MD); 8727 if (Member == CXXInvalid) { 8728 Diag(DefaultLoc, diag::err_default_special_members); 8729 return; 8730 } 8731 8732 MD->setDefaulted(); 8733 MD->setExplicitlyDefaulted(); 8734 8735 // If this definition appears within the record, do the checking when 8736 // the record is complete. 8737 const FunctionDecl *Primary = MD; 8738 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 8739 // Find the uninstantiated declaration that actually had the '= default' 8740 // on it. 8741 MD->getTemplateInstantiationPattern()->isDefined(Primary); 8742 8743 if (Primary == Primary->getCanonicalDecl()) 8744 return; 8745 8746 switch (Member) { 8747 case CXXDefaultConstructor: { 8748 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8749 CheckExplicitlyDefaultedDefaultConstructor(CD); 8750 if (!CD->isInvalidDecl()) 8751 DefineImplicitDefaultConstructor(DefaultLoc, CD); 8752 break; 8753 } 8754 8755 case CXXCopyConstructor: { 8756 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 8757 CheckExplicitlyDefaultedCopyConstructor(CD); 8758 if (!CD->isInvalidDecl()) 8759 DefineImplicitCopyConstructor(DefaultLoc, CD); 8760 break; 8761 } 8762 8763 case CXXCopyAssignment: { 8764 CheckExplicitlyDefaultedCopyAssignment(MD); 8765 if (!MD->isInvalidDecl()) 8766 DefineImplicitCopyAssignment(DefaultLoc, MD); 8767 break; 8768 } 8769 8770 case CXXDestructor: { 8771 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 8772 CheckExplicitlyDefaultedDestructor(DD); 8773 if (!DD->isInvalidDecl()) 8774 DefineImplicitDestructor(DefaultLoc, DD); 8775 break; 8776 } 8777 8778 case CXXMoveConstructor: 8779 case CXXMoveAssignment: 8780 Diag(Dcl->getLocation(), diag::err_defaulted_move_unsupported); 8781 break; 8782 8783 default: 8784 // FIXME: Do the rest once we have move functions 8785 break; 8786 } 8787 } else { 8788 Diag(DefaultLoc, diag::err_default_special_members); 8789 } 8790} 8791 8792static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 8793 for (Stmt::child_range CI = S->children(); CI; ++CI) { 8794 Stmt *SubStmt = *CI; 8795 if (!SubStmt) 8796 continue; 8797 if (isa<ReturnStmt>(SubStmt)) 8798 Self.Diag(SubStmt->getSourceRange().getBegin(), 8799 diag::err_return_in_constructor_handler); 8800 if (!isa<Expr>(SubStmt)) 8801 SearchForReturnInStmt(Self, SubStmt); 8802 } 8803} 8804 8805void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 8806 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 8807 CXXCatchStmt *Handler = TryBlock->getHandler(I); 8808 SearchForReturnInStmt(*this, Handler); 8809 } 8810} 8811 8812bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 8813 const CXXMethodDecl *Old) { 8814 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 8815 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 8816 8817 if (Context.hasSameType(NewTy, OldTy) || 8818 NewTy->isDependentType() || OldTy->isDependentType()) 8819 return false; 8820 8821 // Check if the return types are covariant 8822 QualType NewClassTy, OldClassTy; 8823 8824 /// Both types must be pointers or references to classes. 8825 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 8826 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 8827 NewClassTy = NewPT->getPointeeType(); 8828 OldClassTy = OldPT->getPointeeType(); 8829 } 8830 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 8831 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 8832 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 8833 NewClassTy = NewRT->getPointeeType(); 8834 OldClassTy = OldRT->getPointeeType(); 8835 } 8836 } 8837 } 8838 8839 // The return types aren't either both pointers or references to a class type. 8840 if (NewClassTy.isNull()) { 8841 Diag(New->getLocation(), 8842 diag::err_different_return_type_for_overriding_virtual_function) 8843 << New->getDeclName() << NewTy << OldTy; 8844 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8845 8846 return true; 8847 } 8848 8849 // C++ [class.virtual]p6: 8850 // If the return type of D::f differs from the return type of B::f, the 8851 // class type in the return type of D::f shall be complete at the point of 8852 // declaration of D::f or shall be the class type D. 8853 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 8854 if (!RT->isBeingDefined() && 8855 RequireCompleteType(New->getLocation(), NewClassTy, 8856 PDiag(diag::err_covariant_return_incomplete) 8857 << New->getDeclName())) 8858 return true; 8859 } 8860 8861 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 8862 // Check if the new class derives from the old class. 8863 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 8864 Diag(New->getLocation(), 8865 diag::err_covariant_return_not_derived) 8866 << New->getDeclName() << NewTy << OldTy; 8867 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8868 return true; 8869 } 8870 8871 // Check if we the conversion from derived to base is valid. 8872 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 8873 diag::err_covariant_return_inaccessible_base, 8874 diag::err_covariant_return_ambiguous_derived_to_base_conv, 8875 // FIXME: Should this point to the return type? 8876 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 8877 // FIXME: this note won't trigger for delayed access control 8878 // diagnostics, and it's impossible to get an undelayed error 8879 // here from access control during the original parse because 8880 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 8881 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8882 return true; 8883 } 8884 } 8885 8886 // The qualifiers of the return types must be the same. 8887 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 8888 Diag(New->getLocation(), 8889 diag::err_covariant_return_type_different_qualifications) 8890 << New->getDeclName() << NewTy << OldTy; 8891 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8892 return true; 8893 }; 8894 8895 8896 // The new class type must have the same or less qualifiers as the old type. 8897 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 8898 Diag(New->getLocation(), 8899 diag::err_covariant_return_type_class_type_more_qualified) 8900 << New->getDeclName() << NewTy << OldTy; 8901 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 8902 return true; 8903 }; 8904 8905 return false; 8906} 8907 8908/// \brief Mark the given method pure. 8909/// 8910/// \param Method the method to be marked pure. 8911/// 8912/// \param InitRange the source range that covers the "0" initializer. 8913bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 8914 SourceLocation EndLoc = InitRange.getEnd(); 8915 if (EndLoc.isValid()) 8916 Method->setRangeEnd(EndLoc); 8917 8918 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 8919 Method->setPure(); 8920 return false; 8921 } 8922 8923 if (!Method->isInvalidDecl()) 8924 Diag(Method->getLocation(), diag::err_non_virtual_pure) 8925 << Method->getDeclName() << InitRange; 8926 return true; 8927} 8928 8929/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 8930/// an initializer for the out-of-line declaration 'Dcl'. The scope 8931/// is a fresh scope pushed for just this purpose. 8932/// 8933/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 8934/// static data member of class X, names should be looked up in the scope of 8935/// class X. 8936void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 8937 // If there is no declaration, there was an error parsing it. 8938 if (D == 0 || D->isInvalidDecl()) return; 8939 8940 // We should only get called for declarations with scope specifiers, like: 8941 // int foo::bar; 8942 assert(D->isOutOfLine()); 8943 EnterDeclaratorContext(S, D->getDeclContext()); 8944} 8945 8946/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 8947/// initializer for the out-of-line declaration 'D'. 8948void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 8949 // If there is no declaration, there was an error parsing it. 8950 if (D == 0 || D->isInvalidDecl()) return; 8951 8952 assert(D->isOutOfLine()); 8953 ExitDeclaratorContext(S); 8954} 8955 8956/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 8957/// C++ if/switch/while/for statement. 8958/// e.g: "if (int x = f()) {...}" 8959DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 8960 // C++ 6.4p2: 8961 // The declarator shall not specify a function or an array. 8962 // The type-specifier-seq shall not contain typedef and shall not declare a 8963 // new class or enumeration. 8964 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 8965 "Parser allowed 'typedef' as storage class of condition decl."); 8966 8967 Decl *Dcl = ActOnDeclarator(S, D); 8968 if (!Dcl) 8969 return true; 8970 8971 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 8972 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 8973 << D.getSourceRange(); 8974 return true; 8975 } 8976 8977 return Dcl; 8978} 8979 8980void Sema::LoadExternalVTableUses() { 8981 if (!ExternalSource) 8982 return; 8983 8984 SmallVector<ExternalVTableUse, 4> VTables; 8985 ExternalSource->ReadUsedVTables(VTables); 8986 SmallVector<VTableUse, 4> NewUses; 8987 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 8988 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 8989 = VTablesUsed.find(VTables[I].Record); 8990 // Even if a definition wasn't required before, it may be required now. 8991 if (Pos != VTablesUsed.end()) { 8992 if (!Pos->second && VTables[I].DefinitionRequired) 8993 Pos->second = true; 8994 continue; 8995 } 8996 8997 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 8998 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 8999 } 9000 9001 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 9002} 9003 9004void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 9005 bool DefinitionRequired) { 9006 // Ignore any vtable uses in unevaluated operands or for classes that do 9007 // not have a vtable. 9008 if (!Class->isDynamicClass() || Class->isDependentContext() || 9009 CurContext->isDependentContext() || 9010 ExprEvalContexts.back().Context == Unevaluated) 9011 return; 9012 9013 // Try to insert this class into the map. 9014 LoadExternalVTableUses(); 9015 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9016 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 9017 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 9018 if (!Pos.second) { 9019 // If we already had an entry, check to see if we are promoting this vtable 9020 // to required a definition. If so, we need to reappend to the VTableUses 9021 // list, since we may have already processed the first entry. 9022 if (DefinitionRequired && !Pos.first->second) { 9023 Pos.first->second = true; 9024 } else { 9025 // Otherwise, we can early exit. 9026 return; 9027 } 9028 } 9029 9030 // Local classes need to have their virtual members marked 9031 // immediately. For all other classes, we mark their virtual members 9032 // at the end of the translation unit. 9033 if (Class->isLocalClass()) 9034 MarkVirtualMembersReferenced(Loc, Class); 9035 else 9036 VTableUses.push_back(std::make_pair(Class, Loc)); 9037} 9038 9039bool Sema::DefineUsedVTables() { 9040 LoadExternalVTableUses(); 9041 if (VTableUses.empty()) 9042 return false; 9043 9044 // Note: The VTableUses vector could grow as a result of marking 9045 // the members of a class as "used", so we check the size each 9046 // time through the loop and prefer indices (with are stable) to 9047 // iterators (which are not). 9048 bool DefinedAnything = false; 9049 for (unsigned I = 0; I != VTableUses.size(); ++I) { 9050 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 9051 if (!Class) 9052 continue; 9053 9054 SourceLocation Loc = VTableUses[I].second; 9055 9056 // If this class has a key function, but that key function is 9057 // defined in another translation unit, we don't need to emit the 9058 // vtable even though we're using it. 9059 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 9060 if (KeyFunction && !KeyFunction->hasBody()) { 9061 switch (KeyFunction->getTemplateSpecializationKind()) { 9062 case TSK_Undeclared: 9063 case TSK_ExplicitSpecialization: 9064 case TSK_ExplicitInstantiationDeclaration: 9065 // The key function is in another translation unit. 9066 continue; 9067 9068 case TSK_ExplicitInstantiationDefinition: 9069 case TSK_ImplicitInstantiation: 9070 // We will be instantiating the key function. 9071 break; 9072 } 9073 } else if (!KeyFunction) { 9074 // If we have a class with no key function that is the subject 9075 // of an explicit instantiation declaration, suppress the 9076 // vtable; it will live with the explicit instantiation 9077 // definition. 9078 bool IsExplicitInstantiationDeclaration 9079 = Class->getTemplateSpecializationKind() 9080 == TSK_ExplicitInstantiationDeclaration; 9081 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 9082 REnd = Class->redecls_end(); 9083 R != REnd; ++R) { 9084 TemplateSpecializationKind TSK 9085 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 9086 if (TSK == TSK_ExplicitInstantiationDeclaration) 9087 IsExplicitInstantiationDeclaration = true; 9088 else if (TSK == TSK_ExplicitInstantiationDefinition) { 9089 IsExplicitInstantiationDeclaration = false; 9090 break; 9091 } 9092 } 9093 9094 if (IsExplicitInstantiationDeclaration) 9095 continue; 9096 } 9097 9098 // Mark all of the virtual members of this class as referenced, so 9099 // that we can build a vtable. Then, tell the AST consumer that a 9100 // vtable for this class is required. 9101 DefinedAnything = true; 9102 MarkVirtualMembersReferenced(Loc, Class); 9103 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 9104 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 9105 9106 // Optionally warn if we're emitting a weak vtable. 9107 if (Class->getLinkage() == ExternalLinkage && 9108 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 9109 if (!KeyFunction || (KeyFunction->hasBody() && KeyFunction->isInlined())) 9110 Diag(Class->getLocation(), diag::warn_weak_vtable) << Class; 9111 } 9112 } 9113 VTableUses.clear(); 9114 9115 return DefinedAnything; 9116} 9117 9118void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 9119 const CXXRecordDecl *RD) { 9120 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 9121 e = RD->method_end(); i != e; ++i) { 9122 CXXMethodDecl *MD = *i; 9123 9124 // C++ [basic.def.odr]p2: 9125 // [...] A virtual member function is used if it is not pure. [...] 9126 if (MD->isVirtual() && !MD->isPure()) 9127 MarkDeclarationReferenced(Loc, MD); 9128 } 9129 9130 // Only classes that have virtual bases need a VTT. 9131 if (RD->getNumVBases() == 0) 9132 return; 9133 9134 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 9135 e = RD->bases_end(); i != e; ++i) { 9136 const CXXRecordDecl *Base = 9137 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 9138 if (Base->getNumVBases() == 0) 9139 continue; 9140 MarkVirtualMembersReferenced(Loc, Base); 9141 } 9142} 9143 9144/// SetIvarInitializers - This routine builds initialization ASTs for the 9145/// Objective-C implementation whose ivars need be initialized. 9146void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 9147 if (!getLangOptions().CPlusPlus) 9148 return; 9149 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 9150 SmallVector<ObjCIvarDecl*, 8> ivars; 9151 CollectIvarsToConstructOrDestruct(OID, ivars); 9152 if (ivars.empty()) 9153 return; 9154 SmallVector<CXXCtorInitializer*, 32> AllToInit; 9155 for (unsigned i = 0; i < ivars.size(); i++) { 9156 FieldDecl *Field = ivars[i]; 9157 if (Field->isInvalidDecl()) 9158 continue; 9159 9160 CXXCtorInitializer *Member; 9161 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 9162 InitializationKind InitKind = 9163 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 9164 9165 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 9166 ExprResult MemberInit = 9167 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 9168 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 9169 // Note, MemberInit could actually come back empty if no initialization 9170 // is required (e.g., because it would call a trivial default constructor) 9171 if (!MemberInit.get() || MemberInit.isInvalid()) 9172 continue; 9173 9174 Member = 9175 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 9176 SourceLocation(), 9177 MemberInit.takeAs<Expr>(), 9178 SourceLocation()); 9179 AllToInit.push_back(Member); 9180 9181 // Be sure that the destructor is accessible and is marked as referenced. 9182 if (const RecordType *RecordTy 9183 = Context.getBaseElementType(Field->getType()) 9184 ->getAs<RecordType>()) { 9185 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 9186 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 9187 MarkDeclarationReferenced(Field->getLocation(), Destructor); 9188 CheckDestructorAccess(Field->getLocation(), Destructor, 9189 PDiag(diag::err_access_dtor_ivar) 9190 << Context.getBaseElementType(Field->getType())); 9191 } 9192 } 9193 } 9194 ObjCImplementation->setIvarInitializers(Context, 9195 AllToInit.data(), AllToInit.size()); 9196 } 9197} 9198 9199static 9200void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 9201 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 9202 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 9203 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 9204 Sema &S) { 9205 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9206 CE = Current.end(); 9207 if (Ctor->isInvalidDecl()) 9208 return; 9209 9210 const FunctionDecl *FNTarget = 0; 9211 CXXConstructorDecl *Target; 9212 9213 // We ignore the result here since if we don't have a body, Target will be 9214 // null below. 9215 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 9216 Target 9217= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 9218 9219 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 9220 // Avoid dereferencing a null pointer here. 9221 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 9222 9223 if (!Current.insert(Canonical)) 9224 return; 9225 9226 // We know that beyond here, we aren't chaining into a cycle. 9227 if (!Target || !Target->isDelegatingConstructor() || 9228 Target->isInvalidDecl() || Valid.count(TCanonical)) { 9229 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9230 Valid.insert(*CI); 9231 Current.clear(); 9232 // We've hit a cycle. 9233 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 9234 Current.count(TCanonical)) { 9235 // If we haven't diagnosed this cycle yet, do so now. 9236 if (!Invalid.count(TCanonical)) { 9237 S.Diag((*Ctor->init_begin())->getSourceLocation(), 9238 diag::warn_delegating_ctor_cycle) 9239 << Ctor; 9240 9241 // Don't add a note for a function delegating directo to itself. 9242 if (TCanonical != Canonical) 9243 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 9244 9245 CXXConstructorDecl *C = Target; 9246 while (C->getCanonicalDecl() != Canonical) { 9247 (void)C->getTargetConstructor()->hasBody(FNTarget); 9248 assert(FNTarget && "Ctor cycle through bodiless function"); 9249 9250 C 9251 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 9252 S.Diag(C->getLocation(), diag::note_which_delegates_to); 9253 } 9254 } 9255 9256 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 9257 Invalid.insert(*CI); 9258 Current.clear(); 9259 } else { 9260 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 9261 } 9262} 9263 9264 9265void Sema::CheckDelegatingCtorCycles() { 9266 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 9267 9268 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 9269 CE = Current.end(); 9270 9271 for (DelegatingCtorDeclsType::iterator 9272 I = DelegatingCtorDecls.begin(ExternalSource), 9273 E = DelegatingCtorDecls.end(); 9274 I != E; ++I) { 9275 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 9276 } 9277 9278 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 9279 (*CI)->setInvalidDecl(); 9280} 9281