SemaDeclCXX.cpp revision 625bb569df0c34feec0d52c0ec5215f21ef2e054
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/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/ExprCXX.h" 27#include "clang/AST/RecordLayout.h" 28#include "clang/AST/StmtVisitor.h" 29#include "clang/AST/TypeLoc.h" 30#include "clang/AST/TypeOrdering.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Basic/PartialDiagnostic.h" 34#include "clang/Lex/Preprocessor.h" 35#include "llvm/ADT/DenseSet.h" 36#include "llvm/ADT/SmallString.h" 37#include "llvm/ADT/STLExtras.h" 38#include <map> 39#include <set> 40 41using namespace clang; 42 43//===----------------------------------------------------------------------===// 44// CheckDefaultArgumentVisitor 45//===----------------------------------------------------------------------===// 46 47namespace { 48 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 49 /// the default argument of a parameter to determine whether it 50 /// contains any ill-formed subexpressions. For example, this will 51 /// diagnose the use of local variables or parameters within the 52 /// default argument expression. 53 class CheckDefaultArgumentVisitor 54 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 55 Expr *DefaultArg; 56 Sema *S; 57 58 public: 59 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 60 : DefaultArg(defarg), S(s) {} 61 62 bool VisitExpr(Expr *Node); 63 bool VisitDeclRefExpr(DeclRefExpr *DRE); 64 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 65 bool VisitLambdaExpr(LambdaExpr *Lambda); 66 }; 67 68 /// VisitExpr - Visit all of the children of this expression. 69 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 70 bool IsInvalid = false; 71 for (Stmt::child_range I = Node->children(); I; ++I) 72 IsInvalid |= Visit(*I); 73 return IsInvalid; 74 } 75 76 /// VisitDeclRefExpr - Visit a reference to a declaration, to 77 /// determine whether this declaration can be used in the default 78 /// argument expression. 79 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 80 NamedDecl *Decl = DRE->getDecl(); 81 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 82 // C++ [dcl.fct.default]p9 83 // Default arguments are evaluated each time the function is 84 // called. The order of evaluation of function arguments is 85 // unspecified. Consequently, parameters of a function shall not 86 // be used in default argument expressions, even if they are not 87 // evaluated. Parameters of a function declared before a default 88 // argument expression are in scope and can hide namespace and 89 // class member names. 90 return S->Diag(DRE->getSourceRange().getBegin(), 91 diag::err_param_default_argument_references_param) 92 << Param->getDeclName() << DefaultArg->getSourceRange(); 93 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 94 // C++ [dcl.fct.default]p7 95 // Local variables shall not be used in default argument 96 // expressions. 97 if (VDecl->isLocalVarDecl()) 98 return S->Diag(DRE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_local) 100 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 101 } 102 103 return false; 104 } 105 106 /// VisitCXXThisExpr - Visit a C++ "this" expression. 107 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 108 // C++ [dcl.fct.default]p8: 109 // The keyword this shall not be used in a default argument of a 110 // member function. 111 return S->Diag(ThisE->getSourceRange().getBegin(), 112 diag::err_param_default_argument_references_this) 113 << ThisE->getSourceRange(); 114 } 115 116 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 117 // C++11 [expr.lambda.prim]p13: 118 // A lambda-expression appearing in a default argument shall not 119 // implicitly or explicitly capture any entity. 120 if (Lambda->capture_begin() == Lambda->capture_end()) 121 return false; 122 123 return S->Diag(Lambda->getLocStart(), 124 diag::err_lambda_capture_default_arg); 125 } 126} 127 128void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) { 129 assert(Context && "ImplicitExceptionSpecification without an ASTContext"); 130 // If we have an MSAny or unknown spec already, don't bother. 131 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 132 return; 133 134 const FunctionProtoType *Proto 135 = Method->getType()->getAs<FunctionProtoType>(); 136 137 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 138 139 // If this function can throw any exceptions, make a note of that. 140 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 141 ClearExceptions(); 142 ComputedEST = EST; 143 return; 144 } 145 146 // FIXME: If the call to this decl is using any of its default arguments, we 147 // need to search them for potentially-throwing calls. 148 149 // If this function has a basic noexcept, it doesn't affect the outcome. 150 if (EST == EST_BasicNoexcept) 151 return; 152 153 // If we have a throw-all spec at this point, ignore the function. 154 if (ComputedEST == EST_None) 155 return; 156 157 // If we're still at noexcept(true) and there's a nothrow() callee, 158 // change to that specification. 159 if (EST == EST_DynamicNone) { 160 if (ComputedEST == EST_BasicNoexcept) 161 ComputedEST = EST_DynamicNone; 162 return; 163 } 164 165 // Check out noexcept specs. 166 if (EST == EST_ComputedNoexcept) { 167 FunctionProtoType::NoexceptResult NR = Proto->getNoexceptSpec(*Context); 168 assert(NR != FunctionProtoType::NR_NoNoexcept && 169 "Must have noexcept result for EST_ComputedNoexcept."); 170 assert(NR != FunctionProtoType::NR_Dependent && 171 "Should not generate implicit declarations for dependent cases, " 172 "and don't know how to handle them anyway."); 173 174 // noexcept(false) -> no spec on the new function 175 if (NR == FunctionProtoType::NR_Throw) { 176 ClearExceptions(); 177 ComputedEST = EST_None; 178 } 179 // noexcept(true) won't change anything either. 180 return; 181 } 182 183 assert(EST == EST_Dynamic && "EST case not considered earlier."); 184 assert(ComputedEST != EST_None && 185 "Shouldn't collect exceptions when throw-all is guaranteed."); 186 ComputedEST = EST_Dynamic; 187 // Record the exceptions in this function's exception specification. 188 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 189 EEnd = Proto->exception_end(); 190 E != EEnd; ++E) 191 if (ExceptionsSeen.insert(Context->getCanonicalType(*E))) 192 Exceptions.push_back(*E); 193} 194 195void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 196 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 197 return; 198 199 // FIXME: 200 // 201 // C++0x [except.spec]p14: 202 // [An] implicit exception-specification specifies the type-id T if and 203 // only if T is allowed by the exception-specification of a function directly 204 // invoked by f's implicit definition; f shall allow all exceptions if any 205 // function it directly invokes allows all exceptions, and f shall allow no 206 // exceptions if every function it directly invokes allows no exceptions. 207 // 208 // Note in particular that if an implicit exception-specification is generated 209 // for a function containing a throw-expression, that specification can still 210 // be noexcept(true). 211 // 212 // Note also that 'directly invoked' is not defined in the standard, and there 213 // is no indication that we should only consider potentially-evaluated calls. 214 // 215 // Ultimately we should implement the intent of the standard: the exception 216 // specification should be the set of exceptions which can be thrown by the 217 // implicit definition. For now, we assume that any non-nothrow expression can 218 // throw any exception. 219 220 if (E->CanThrow(*Context)) 221 ComputedEST = EST_None; 222} 223 224bool 225Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 226 SourceLocation EqualLoc) { 227 if (RequireCompleteType(Param->getLocation(), Param->getType(), 228 diag::err_typecheck_decl_incomplete_type)) { 229 Param->setInvalidDecl(); 230 return true; 231 } 232 233 // C++ [dcl.fct.default]p5 234 // A default argument expression is implicitly converted (clause 235 // 4) to the parameter type. The default argument expression has 236 // the same semantic constraints as the initializer expression in 237 // a declaration of a variable of the parameter type, using the 238 // copy-initialization semantics (8.5). 239 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 240 Param); 241 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 242 EqualLoc); 243 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 244 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 245 MultiExprArg(*this, &Arg, 1)); 246 if (Result.isInvalid()) 247 return true; 248 Arg = Result.takeAs<Expr>(); 249 250 CheckImplicitConversions(Arg, EqualLoc); 251 Arg = MaybeCreateExprWithCleanups(Arg); 252 253 // Okay: add the default argument to the parameter 254 Param->setDefaultArg(Arg); 255 256 // We have already instantiated this parameter; provide each of the 257 // instantiations with the uninstantiated default argument. 258 UnparsedDefaultArgInstantiationsMap::iterator InstPos 259 = UnparsedDefaultArgInstantiations.find(Param); 260 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 261 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 262 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 263 264 // We're done tracking this parameter's instantiations. 265 UnparsedDefaultArgInstantiations.erase(InstPos); 266 } 267 268 return false; 269} 270 271/// ActOnParamDefaultArgument - Check whether the default argument 272/// provided for a function parameter is well-formed. If so, attach it 273/// to the parameter declaration. 274void 275Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 276 Expr *DefaultArg) { 277 if (!param || !DefaultArg) 278 return; 279 280 ParmVarDecl *Param = cast<ParmVarDecl>(param); 281 UnparsedDefaultArgLocs.erase(Param); 282 283 // Default arguments are only permitted in C++ 284 if (!getLangOptions().CPlusPlus) { 285 Diag(EqualLoc, diag::err_param_default_argument) 286 << DefaultArg->getSourceRange(); 287 Param->setInvalidDecl(); 288 return; 289 } 290 291 // Check for unexpanded parameter packs. 292 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 293 Param->setInvalidDecl(); 294 return; 295 } 296 297 // Check that the default argument is well-formed 298 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 299 if (DefaultArgChecker.Visit(DefaultArg)) { 300 Param->setInvalidDecl(); 301 return; 302 } 303 304 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 305} 306 307/// ActOnParamUnparsedDefaultArgument - We've seen a default 308/// argument for a function parameter, but we can't parse it yet 309/// because we're inside a class definition. Note that this default 310/// argument will be parsed later. 311void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 312 SourceLocation EqualLoc, 313 SourceLocation ArgLoc) { 314 if (!param) 315 return; 316 317 ParmVarDecl *Param = cast<ParmVarDecl>(param); 318 if (Param) 319 Param->setUnparsedDefaultArg(); 320 321 UnparsedDefaultArgLocs[Param] = ArgLoc; 322} 323 324/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 325/// the default argument for the parameter param failed. 326void Sema::ActOnParamDefaultArgumentError(Decl *param) { 327 if (!param) 328 return; 329 330 ParmVarDecl *Param = cast<ParmVarDecl>(param); 331 332 Param->setInvalidDecl(); 333 334 UnparsedDefaultArgLocs.erase(Param); 335} 336 337/// CheckExtraCXXDefaultArguments - Check for any extra default 338/// arguments in the declarator, which is not a function declaration 339/// or definition and therefore is not permitted to have default 340/// arguments. This routine should be invoked for every declarator 341/// that is not a function declaration or definition. 342void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 343 // C++ [dcl.fct.default]p3 344 // A default argument expression shall be specified only in the 345 // parameter-declaration-clause of a function declaration or in a 346 // template-parameter (14.1). It shall not be specified for a 347 // parameter pack. If it is specified in a 348 // parameter-declaration-clause, it shall not occur within a 349 // declarator or abstract-declarator of a parameter-declaration. 350 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 351 DeclaratorChunk &chunk = D.getTypeObject(i); 352 if (chunk.Kind == DeclaratorChunk::Function) { 353 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 354 ParmVarDecl *Param = 355 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 356 if (Param->hasUnparsedDefaultArg()) { 357 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 358 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 359 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 360 delete Toks; 361 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 362 } else if (Param->getDefaultArg()) { 363 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 364 << Param->getDefaultArg()->getSourceRange(); 365 Param->setDefaultArg(0); 366 } 367 } 368 } 369 } 370} 371 372// MergeCXXFunctionDecl - Merge two declarations of the same C++ 373// function, once we already know that they have the same 374// type. Subroutine of MergeFunctionDecl. Returns true if there was an 375// error, false otherwise. 376bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 377 bool Invalid = false; 378 379 // C++ [dcl.fct.default]p4: 380 // For non-template functions, default arguments can be added in 381 // later declarations of a function in the same 382 // scope. Declarations in different scopes have completely 383 // distinct sets of default arguments. That is, declarations in 384 // inner scopes do not acquire default arguments from 385 // declarations in outer scopes, and vice versa. In a given 386 // function declaration, all parameters subsequent to a 387 // parameter with a default argument shall have default 388 // arguments supplied in this or previous declarations. A 389 // default argument shall not be redefined by a later 390 // declaration (not even to the same value). 391 // 392 // C++ [dcl.fct.default]p6: 393 // Except for member functions of class templates, the default arguments 394 // in a member function definition that appears outside of the class 395 // definition are added to the set of default arguments provided by the 396 // member function declaration in the class definition. 397 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 398 ParmVarDecl *OldParam = Old->getParamDecl(p); 399 ParmVarDecl *NewParam = New->getParamDecl(p); 400 401 if (OldParam->hasDefaultArg() && NewParam->hasDefaultArg()) { 402 403 unsigned DiagDefaultParamID = 404 diag::err_param_default_argument_redefinition; 405 406 // MSVC accepts that default parameters be redefined for member functions 407 // of template class. The new default parameter's value is ignored. 408 Invalid = true; 409 if (getLangOptions().MicrosoftExt) { 410 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 411 if (MD && MD->getParent()->getDescribedClassTemplate()) { 412 // Merge the old default argument into the new parameter. 413 NewParam->setHasInheritedDefaultArg(); 414 if (OldParam->hasUninstantiatedDefaultArg()) 415 NewParam->setUninstantiatedDefaultArg( 416 OldParam->getUninstantiatedDefaultArg()); 417 else 418 NewParam->setDefaultArg(OldParam->getInit()); 419 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 420 Invalid = false; 421 } 422 } 423 424 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 425 // hint here. Alternatively, we could walk the type-source information 426 // for NewParam to find the last source location in the type... but it 427 // isn't worth the effort right now. This is the kind of test case that 428 // is hard to get right: 429 // int f(int); 430 // void g(int (*fp)(int) = f); 431 // void g(int (*fp)(int) = &f); 432 Diag(NewParam->getLocation(), DiagDefaultParamID) 433 << NewParam->getDefaultArgRange(); 434 435 // Look for the function declaration where the default argument was 436 // actually written, which may be a declaration prior to Old. 437 for (FunctionDecl *Older = Old->getPreviousDecl(); 438 Older; Older = Older->getPreviousDecl()) { 439 if (!Older->getParamDecl(p)->hasDefaultArg()) 440 break; 441 442 OldParam = Older->getParamDecl(p); 443 } 444 445 Diag(OldParam->getLocation(), diag::note_previous_definition) 446 << OldParam->getDefaultArgRange(); 447 } else if (OldParam->hasDefaultArg()) { 448 // Merge the old default argument into the new parameter. 449 // It's important to use getInit() here; getDefaultArg() 450 // strips off any top-level ExprWithCleanups. 451 NewParam->setHasInheritedDefaultArg(); 452 if (OldParam->hasUninstantiatedDefaultArg()) 453 NewParam->setUninstantiatedDefaultArg( 454 OldParam->getUninstantiatedDefaultArg()); 455 else 456 NewParam->setDefaultArg(OldParam->getInit()); 457 } else if (NewParam->hasDefaultArg()) { 458 if (New->getDescribedFunctionTemplate()) { 459 // Paragraph 4, quoted above, only applies to non-template functions. 460 Diag(NewParam->getLocation(), 461 diag::err_param_default_argument_template_redecl) 462 << NewParam->getDefaultArgRange(); 463 Diag(Old->getLocation(), diag::note_template_prev_declaration) 464 << false; 465 } else if (New->getTemplateSpecializationKind() 466 != TSK_ImplicitInstantiation && 467 New->getTemplateSpecializationKind() != TSK_Undeclared) { 468 // C++ [temp.expr.spec]p21: 469 // Default function arguments shall not be specified in a declaration 470 // or a definition for one of the following explicit specializations: 471 // - the explicit specialization of a function template; 472 // - the explicit specialization of a member function template; 473 // - the explicit specialization of a member function of a class 474 // template where the class template specialization to which the 475 // member function specialization belongs is implicitly 476 // instantiated. 477 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 478 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 479 << New->getDeclName() 480 << NewParam->getDefaultArgRange(); 481 } else if (New->getDeclContext()->isDependentContext()) { 482 // C++ [dcl.fct.default]p6 (DR217): 483 // Default arguments for a member function of a class template shall 484 // be specified on the initial declaration of the member function 485 // within the class template. 486 // 487 // Reading the tea leaves a bit in DR217 and its reference to DR205 488 // leads me to the conclusion that one cannot add default function 489 // arguments for an out-of-line definition of a member function of a 490 // dependent type. 491 int WhichKind = 2; 492 if (CXXRecordDecl *Record 493 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 494 if (Record->getDescribedClassTemplate()) 495 WhichKind = 0; 496 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 497 WhichKind = 1; 498 else 499 WhichKind = 2; 500 } 501 502 Diag(NewParam->getLocation(), 503 diag::err_param_default_argument_member_template_redecl) 504 << WhichKind 505 << NewParam->getDefaultArgRange(); 506 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 507 CXXSpecialMember NewSM = getSpecialMember(Ctor), 508 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 509 if (NewSM != OldSM) { 510 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 511 << NewParam->getDefaultArgRange() << NewSM; 512 Diag(Old->getLocation(), diag::note_previous_declaration_special) 513 << OldSM; 514 } 515 } 516 } 517 } 518 519 // C++0x [dcl.constexpr]p1: If any declaration of a function or function 520 // template has a constexpr specifier then all its declarations shall 521 // contain the constexpr specifier. [Note: An explicit specialization can 522 // differ from the template declaration with respect to the constexpr 523 // specifier. -- end note] 524 // 525 // FIXME: Don't reject changes in constexpr in explicit specializations. 526 if (New->isConstexpr() != Old->isConstexpr()) { 527 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 528 << New << New->isConstexpr(); 529 Diag(Old->getLocation(), diag::note_previous_declaration); 530 Invalid = true; 531 } 532 533 if (CheckEquivalentExceptionSpec(Old, New)) 534 Invalid = true; 535 536 return Invalid; 537} 538 539/// \brief Merge the exception specifications of two variable declarations. 540/// 541/// This is called when there's a redeclaration of a VarDecl. The function 542/// checks if the redeclaration might have an exception specification and 543/// validates compatibility and merges the specs if necessary. 544void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 545 // Shortcut if exceptions are disabled. 546 if (!getLangOptions().CXXExceptions) 547 return; 548 549 assert(Context.hasSameType(New->getType(), Old->getType()) && 550 "Should only be called if types are otherwise the same."); 551 552 QualType NewType = New->getType(); 553 QualType OldType = Old->getType(); 554 555 // We're only interested in pointers and references to functions, as well 556 // as pointers to member functions. 557 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 558 NewType = R->getPointeeType(); 559 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 560 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 561 NewType = P->getPointeeType(); 562 OldType = OldType->getAs<PointerType>()->getPointeeType(); 563 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 564 NewType = M->getPointeeType(); 565 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 566 } 567 568 if (!NewType->isFunctionProtoType()) 569 return; 570 571 // There's lots of special cases for functions. For function pointers, system 572 // libraries are hopefully not as broken so that we don't need these 573 // workarounds. 574 if (CheckEquivalentExceptionSpec( 575 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 576 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 577 New->setInvalidDecl(); 578 } 579} 580 581/// CheckCXXDefaultArguments - Verify that the default arguments for a 582/// function declaration are well-formed according to C++ 583/// [dcl.fct.default]. 584void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 585 unsigned NumParams = FD->getNumParams(); 586 unsigned p; 587 588 // Find first parameter with a default argument 589 for (p = 0; p < NumParams; ++p) { 590 ParmVarDecl *Param = FD->getParamDecl(p); 591 if (Param->hasDefaultArg()) 592 break; 593 } 594 595 // C++ [dcl.fct.default]p4: 596 // In a given function declaration, all parameters 597 // subsequent to a parameter with a default argument shall 598 // have default arguments supplied in this or previous 599 // declarations. A default argument shall not be redefined 600 // by a later declaration (not even to the same value). 601 unsigned LastMissingDefaultArg = 0; 602 for (; p < NumParams; ++p) { 603 ParmVarDecl *Param = FD->getParamDecl(p); 604 if (!Param->hasDefaultArg()) { 605 if (Param->isInvalidDecl()) 606 /* We already complained about this parameter. */; 607 else if (Param->getIdentifier()) 608 Diag(Param->getLocation(), 609 diag::err_param_default_argument_missing_name) 610 << Param->getIdentifier(); 611 else 612 Diag(Param->getLocation(), 613 diag::err_param_default_argument_missing); 614 615 LastMissingDefaultArg = p; 616 } 617 } 618 619 if (LastMissingDefaultArg > 0) { 620 // Some default arguments were missing. Clear out all of the 621 // default arguments up to (and including) the last missing 622 // default argument, so that we leave the function parameters 623 // in a semantically valid state. 624 for (p = 0; p <= LastMissingDefaultArg; ++p) { 625 ParmVarDecl *Param = FD->getParamDecl(p); 626 if (Param->hasDefaultArg()) { 627 Param->setDefaultArg(0); 628 } 629 } 630 } 631} 632 633// CheckConstexprParameterTypes - Check whether a function's parameter types 634// are all literal types. If so, return true. If not, produce a suitable 635// diagnostic and return false. 636static bool CheckConstexprParameterTypes(Sema &SemaRef, 637 const FunctionDecl *FD) { 638 unsigned ArgIndex = 0; 639 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 640 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 641 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 642 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 643 SourceLocation ParamLoc = PD->getLocation(); 644 if (!(*i)->isDependentType() && 645 SemaRef.RequireLiteralType(ParamLoc, *i, 646 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 647 << ArgIndex+1 << PD->getSourceRange() 648 << isa<CXXConstructorDecl>(FD))) 649 return false; 650 } 651 return true; 652} 653 654// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 655// the requirements of a constexpr function definition or a constexpr 656// constructor definition. If so, return true. If not, produce appropriate 657// diagnostics and return false. 658// 659// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 660bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 661 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 662 if (MD && MD->isInstance()) { 663 // C++11 [dcl.constexpr]p4: 664 // The definition of a constexpr constructor shall satisfy the following 665 // constraints: 666 // - the class shall not have any virtual base classes; 667 const CXXRecordDecl *RD = MD->getParent(); 668 if (RD->getNumVBases()) { 669 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 670 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 671 << RD->getNumVBases(); 672 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 673 E = RD->vbases_end(); I != E; ++I) 674 Diag(I->getSourceRange().getBegin(), 675 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 676 return false; 677 } 678 } 679 680 if (!isa<CXXConstructorDecl>(NewFD)) { 681 // C++11 [dcl.constexpr]p3: 682 // The definition of a constexpr function shall satisfy the following 683 // constraints: 684 // - it shall not be virtual; 685 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 686 if (Method && Method->isVirtual()) { 687 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 688 689 // If it's not obvious why this function is virtual, find an overridden 690 // function which uses the 'virtual' keyword. 691 const CXXMethodDecl *WrittenVirtual = Method; 692 while (!WrittenVirtual->isVirtualAsWritten()) 693 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 694 if (WrittenVirtual != Method) 695 Diag(WrittenVirtual->getLocation(), 696 diag::note_overridden_virtual_function); 697 return false; 698 } 699 700 // - its return type shall be a literal type; 701 QualType RT = NewFD->getResultType(); 702 if (!RT->isDependentType() && 703 RequireLiteralType(NewFD->getLocation(), RT, 704 PDiag(diag::err_constexpr_non_literal_return))) 705 return false; 706 } 707 708 // - each of its parameter types shall be a literal type; 709 if (!CheckConstexprParameterTypes(*this, NewFD)) 710 return false; 711 712 return true; 713} 714 715/// Check the given declaration statement is legal within a constexpr function 716/// body. C++0x [dcl.constexpr]p3,p4. 717/// 718/// \return true if the body is OK, false if we have diagnosed a problem. 719static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 720 DeclStmt *DS) { 721 // C++0x [dcl.constexpr]p3 and p4: 722 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 723 // contain only 724 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 725 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 726 switch ((*DclIt)->getKind()) { 727 case Decl::StaticAssert: 728 case Decl::Using: 729 case Decl::UsingShadow: 730 case Decl::UsingDirective: 731 case Decl::UnresolvedUsingTypename: 732 // - static_assert-declarations 733 // - using-declarations, 734 // - using-directives, 735 continue; 736 737 case Decl::Typedef: 738 case Decl::TypeAlias: { 739 // - typedef declarations and alias-declarations that do not define 740 // classes or enumerations, 741 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 742 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 743 // Don't allow variably-modified types in constexpr functions. 744 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 745 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 746 << TL.getSourceRange() << TL.getType() 747 << isa<CXXConstructorDecl>(Dcl); 748 return false; 749 } 750 continue; 751 } 752 753 case Decl::Enum: 754 case Decl::CXXRecord: 755 // As an extension, we allow the declaration (but not the definition) of 756 // classes and enumerations in all declarations, not just in typedef and 757 // alias declarations. 758 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 759 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 760 << isa<CXXConstructorDecl>(Dcl); 761 return false; 762 } 763 continue; 764 765 case Decl::Var: 766 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 767 << isa<CXXConstructorDecl>(Dcl); 768 return false; 769 770 default: 771 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 772 << isa<CXXConstructorDecl>(Dcl); 773 return false; 774 } 775 } 776 777 return true; 778} 779 780/// Check that the given field is initialized within a constexpr constructor. 781/// 782/// \param Dcl The constexpr constructor being checked. 783/// \param Field The field being checked. This may be a member of an anonymous 784/// struct or union nested within the class being checked. 785/// \param Inits All declarations, including anonymous struct/union members and 786/// indirect members, for which any initialization was provided. 787/// \param Diagnosed Set to true if an error is produced. 788static void CheckConstexprCtorInitializer(Sema &SemaRef, 789 const FunctionDecl *Dcl, 790 FieldDecl *Field, 791 llvm::SmallSet<Decl*, 16> &Inits, 792 bool &Diagnosed) { 793 if (Field->isUnnamedBitfield()) 794 return; 795 796 if (Field->isAnonymousStructOrUnion() && 797 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 798 return; 799 800 if (!Inits.count(Field)) { 801 if (!Diagnosed) { 802 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 803 Diagnosed = true; 804 } 805 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 806 } else if (Field->isAnonymousStructOrUnion()) { 807 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 808 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 809 I != E; ++I) 810 // If an anonymous union contains an anonymous struct of which any member 811 // is initialized, all members must be initialized. 812 if (!RD->isUnion() || Inits.count(*I)) 813 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 814 } 815} 816 817/// Check the body for the given constexpr function declaration only contains 818/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 819/// 820/// \return true if the body is OK, false if we have diagnosed a problem. 821bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 822 if (isa<CXXTryStmt>(Body)) { 823 // C++11 [dcl.constexpr]p3: 824 // The definition of a constexpr function shall satisfy the following 825 // constraints: [...] 826 // - its function-body shall be = delete, = default, or a 827 // compound-statement 828 // 829 // C++11 [dcl.constexpr]p4: 830 // In the definition of a constexpr constructor, [...] 831 // - its function-body shall not be a function-try-block; 832 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 833 << isa<CXXConstructorDecl>(Dcl); 834 return false; 835 } 836 837 // - its function-body shall be [...] a compound-statement that contains only 838 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 839 840 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 841 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 842 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 843 switch ((*BodyIt)->getStmtClass()) { 844 case Stmt::NullStmtClass: 845 // - null statements, 846 continue; 847 848 case Stmt::DeclStmtClass: 849 // - static_assert-declarations 850 // - using-declarations, 851 // - using-directives, 852 // - typedef declarations and alias-declarations that do not define 853 // classes or enumerations, 854 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 855 return false; 856 continue; 857 858 case Stmt::ReturnStmtClass: 859 // - and exactly one return statement; 860 if (isa<CXXConstructorDecl>(Dcl)) 861 break; 862 863 ReturnStmts.push_back((*BodyIt)->getLocStart()); 864 // FIXME 865 // - every constructor call and implicit conversion used in initializing 866 // the return value shall be one of those allowed in a constant 867 // expression. 868 // Deal with this as part of a general check that the function can produce 869 // a constant expression (for [dcl.constexpr]p5). 870 continue; 871 872 default: 873 break; 874 } 875 876 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 877 << isa<CXXConstructorDecl>(Dcl); 878 return false; 879 } 880 881 if (const CXXConstructorDecl *Constructor 882 = dyn_cast<CXXConstructorDecl>(Dcl)) { 883 const CXXRecordDecl *RD = Constructor->getParent(); 884 // DR1359: 885 // - every non-variant non-static data member and base class sub-object 886 // shall be initialized; 887 // - if the class is a non-empty union, or for each non-empty anonymous 888 // union member of a non-union class, exactly one non-static data member 889 // shall be initialized; 890 if (RD->isUnion()) { 891 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 892 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 893 return false; 894 } 895 } else if (!Constructor->isDependentContext() && 896 !Constructor->isDelegatingConstructor()) { 897 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 898 899 // Skip detailed checking if we have enough initializers, and we would 900 // allow at most one initializer per member. 901 bool AnyAnonStructUnionMembers = false; 902 unsigned Fields = 0; 903 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 904 E = RD->field_end(); I != E; ++I, ++Fields) { 905 if ((*I)->isAnonymousStructOrUnion()) { 906 AnyAnonStructUnionMembers = true; 907 break; 908 } 909 } 910 if (AnyAnonStructUnionMembers || 911 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 912 // Check initialization of non-static data members. Base classes are 913 // always initialized so do not need to be checked. Dependent bases 914 // might not have initializers in the member initializer list. 915 llvm::SmallSet<Decl*, 16> Inits; 916 for (CXXConstructorDecl::init_const_iterator 917 I = Constructor->init_begin(), E = Constructor->init_end(); 918 I != E; ++I) { 919 if (FieldDecl *FD = (*I)->getMember()) 920 Inits.insert(FD); 921 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 922 Inits.insert(ID->chain_begin(), ID->chain_end()); 923 } 924 925 bool Diagnosed = false; 926 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 927 E = RD->field_end(); I != E; ++I) 928 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 929 if (Diagnosed) 930 return false; 931 } 932 } 933 934 // FIXME 935 // - every constructor involved in initializing non-static data members 936 // and base class sub-objects shall be a constexpr constructor; 937 // - every assignment-expression that is an initializer-clause appearing 938 // directly or indirectly within a brace-or-equal-initializer for 939 // a non-static data member that is not named by a mem-initializer-id 940 // shall be a constant expression; and 941 // - every implicit conversion used in converting a constructor argument 942 // to the corresponding parameter type and converting 943 // a full-expression to the corresponding member type shall be one of 944 // those allowed in a constant expression. 945 // Deal with these as part of a general check that the function can produce 946 // a constant expression (for [dcl.constexpr]p5). 947 } else { 948 if (ReturnStmts.empty()) { 949 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 950 return false; 951 } 952 if (ReturnStmts.size() > 1) { 953 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 954 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 955 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 956 return false; 957 } 958 } 959 960 // C++11 [dcl.constexpr]p5: 961 // if no function argument values exist such that the function invocation 962 // substitution would produce a constant expression, the program is 963 // ill-formed; no diagnostic required. 964 // C++11 [dcl.constexpr]p3: 965 // - every constructor call and implicit conversion used in initializing the 966 // return value shall be one of those allowed in a constant expression. 967 // C++11 [dcl.constexpr]p4: 968 // - every constructor involved in initializing non-static data members and 969 // base class sub-objects shall be a constexpr constructor. 970 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 971 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 972 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 973 << isa<CXXConstructorDecl>(Dcl); 974 for (size_t I = 0, N = Diags.size(); I != N; ++I) 975 Diag(Diags[I].first, Diags[I].second); 976 return false; 977 } 978 979 return true; 980} 981 982/// isCurrentClassName - Determine whether the identifier II is the 983/// name of the class type currently being defined. In the case of 984/// nested classes, this will only return true if II is the name of 985/// the innermost class. 986bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 987 const CXXScopeSpec *SS) { 988 assert(getLangOptions().CPlusPlus && "No class names in C!"); 989 990 CXXRecordDecl *CurDecl; 991 if (SS && SS->isSet() && !SS->isInvalid()) { 992 DeclContext *DC = computeDeclContext(*SS, true); 993 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 994 } else 995 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 996 997 if (CurDecl && CurDecl->getIdentifier()) 998 return &II == CurDecl->getIdentifier(); 999 else 1000 return false; 1001} 1002 1003/// \brief Check the validity of a C++ base class specifier. 1004/// 1005/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1006/// and returns NULL otherwise. 1007CXXBaseSpecifier * 1008Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1009 SourceRange SpecifierRange, 1010 bool Virtual, AccessSpecifier Access, 1011 TypeSourceInfo *TInfo, 1012 SourceLocation EllipsisLoc) { 1013 QualType BaseType = TInfo->getType(); 1014 1015 // C++ [class.union]p1: 1016 // A union shall not have base classes. 1017 if (Class->isUnion()) { 1018 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1019 << SpecifierRange; 1020 return 0; 1021 } 1022 1023 if (EllipsisLoc.isValid() && 1024 !TInfo->getType()->containsUnexpandedParameterPack()) { 1025 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1026 << TInfo->getTypeLoc().getSourceRange(); 1027 EllipsisLoc = SourceLocation(); 1028 } 1029 1030 if (BaseType->isDependentType()) 1031 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1032 Class->getTagKind() == TTK_Class, 1033 Access, TInfo, EllipsisLoc); 1034 1035 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1036 1037 // Base specifiers must be record types. 1038 if (!BaseType->isRecordType()) { 1039 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1040 return 0; 1041 } 1042 1043 // C++ [class.union]p1: 1044 // A union shall not be used as a base class. 1045 if (BaseType->isUnionType()) { 1046 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1047 return 0; 1048 } 1049 1050 // C++ [class.derived]p2: 1051 // The class-name in a base-specifier shall not be an incompletely 1052 // defined class. 1053 if (RequireCompleteType(BaseLoc, BaseType, 1054 PDiag(diag::err_incomplete_base_class) 1055 << SpecifierRange)) { 1056 Class->setInvalidDecl(); 1057 return 0; 1058 } 1059 1060 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1061 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1062 assert(BaseDecl && "Record type has no declaration"); 1063 BaseDecl = BaseDecl->getDefinition(); 1064 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1065 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1066 assert(CXXBaseDecl && "Base type is not a C++ type"); 1067 1068 // C++ [class]p3: 1069 // If a class is marked final and it appears as a base-type-specifier in 1070 // base-clause, the program is ill-formed. 1071 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1072 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1073 << CXXBaseDecl->getDeclName(); 1074 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1075 << CXXBaseDecl->getDeclName(); 1076 return 0; 1077 } 1078 1079 if (BaseDecl->isInvalidDecl()) 1080 Class->setInvalidDecl(); 1081 1082 // Create the base specifier. 1083 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1084 Class->getTagKind() == TTK_Class, 1085 Access, TInfo, EllipsisLoc); 1086} 1087 1088/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1089/// one entry in the base class list of a class specifier, for 1090/// example: 1091/// class foo : public bar, virtual private baz { 1092/// 'public bar' and 'virtual private baz' are each base-specifiers. 1093BaseResult 1094Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1095 bool Virtual, AccessSpecifier Access, 1096 ParsedType basetype, SourceLocation BaseLoc, 1097 SourceLocation EllipsisLoc) { 1098 if (!classdecl) 1099 return true; 1100 1101 AdjustDeclIfTemplate(classdecl); 1102 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1103 if (!Class) 1104 return true; 1105 1106 TypeSourceInfo *TInfo = 0; 1107 GetTypeFromParser(basetype, &TInfo); 1108 1109 if (EllipsisLoc.isInvalid() && 1110 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1111 UPPC_BaseType)) 1112 return true; 1113 1114 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1115 Virtual, Access, TInfo, 1116 EllipsisLoc)) 1117 return BaseSpec; 1118 1119 return true; 1120} 1121 1122/// \brief Performs the actual work of attaching the given base class 1123/// specifiers to a C++ class. 1124bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1125 unsigned NumBases) { 1126 if (NumBases == 0) 1127 return false; 1128 1129 // Used to keep track of which base types we have already seen, so 1130 // that we can properly diagnose redundant direct base types. Note 1131 // that the key is always the unqualified canonical type of the base 1132 // class. 1133 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1134 1135 // Copy non-redundant base specifiers into permanent storage. 1136 unsigned NumGoodBases = 0; 1137 bool Invalid = false; 1138 for (unsigned idx = 0; idx < NumBases; ++idx) { 1139 QualType NewBaseType 1140 = Context.getCanonicalType(Bases[idx]->getType()); 1141 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1142 if (KnownBaseTypes[NewBaseType]) { 1143 // C++ [class.mi]p3: 1144 // A class shall not be specified as a direct base class of a 1145 // derived class more than once. 1146 Diag(Bases[idx]->getSourceRange().getBegin(), 1147 diag::err_duplicate_base_class) 1148 << KnownBaseTypes[NewBaseType]->getType() 1149 << Bases[idx]->getSourceRange(); 1150 1151 // Delete the duplicate base class specifier; we're going to 1152 // overwrite its pointer later. 1153 Context.Deallocate(Bases[idx]); 1154 1155 Invalid = true; 1156 } else { 1157 // Okay, add this new base class. 1158 KnownBaseTypes[NewBaseType] = Bases[idx]; 1159 Bases[NumGoodBases++] = Bases[idx]; 1160 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1161 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1162 if (RD->hasAttr<WeakAttr>()) 1163 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1164 } 1165 } 1166 1167 // Attach the remaining base class specifiers to the derived class. 1168 Class->setBases(Bases, NumGoodBases); 1169 1170 // Delete the remaining (good) base class specifiers, since their 1171 // data has been copied into the CXXRecordDecl. 1172 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1173 Context.Deallocate(Bases[idx]); 1174 1175 return Invalid; 1176} 1177 1178/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1179/// class, after checking whether there are any duplicate base 1180/// classes. 1181void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1182 unsigned NumBases) { 1183 if (!ClassDecl || !Bases || !NumBases) 1184 return; 1185 1186 AdjustDeclIfTemplate(ClassDecl); 1187 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1188 (CXXBaseSpecifier**)(Bases), NumBases); 1189} 1190 1191static CXXRecordDecl *GetClassForType(QualType T) { 1192 if (const RecordType *RT = T->getAs<RecordType>()) 1193 return cast<CXXRecordDecl>(RT->getDecl()); 1194 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1195 return ICT->getDecl(); 1196 else 1197 return 0; 1198} 1199 1200/// \brief Determine whether the type \p Derived is a C++ class that is 1201/// derived from the type \p Base. 1202bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1203 if (!getLangOptions().CPlusPlus) 1204 return false; 1205 1206 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1207 if (!DerivedRD) 1208 return false; 1209 1210 CXXRecordDecl *BaseRD = GetClassForType(Base); 1211 if (!BaseRD) 1212 return false; 1213 1214 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1215 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1216} 1217 1218/// \brief Determine whether the type \p Derived is a C++ class that is 1219/// derived from the type \p Base. 1220bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1221 if (!getLangOptions().CPlusPlus) 1222 return false; 1223 1224 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1225 if (!DerivedRD) 1226 return false; 1227 1228 CXXRecordDecl *BaseRD = GetClassForType(Base); 1229 if (!BaseRD) 1230 return false; 1231 1232 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1233} 1234 1235void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1236 CXXCastPath &BasePathArray) { 1237 assert(BasePathArray.empty() && "Base path array must be empty!"); 1238 assert(Paths.isRecordingPaths() && "Must record paths!"); 1239 1240 const CXXBasePath &Path = Paths.front(); 1241 1242 // We first go backward and check if we have a virtual base. 1243 // FIXME: It would be better if CXXBasePath had the base specifier for 1244 // the nearest virtual base. 1245 unsigned Start = 0; 1246 for (unsigned I = Path.size(); I != 0; --I) { 1247 if (Path[I - 1].Base->isVirtual()) { 1248 Start = I - 1; 1249 break; 1250 } 1251 } 1252 1253 // Now add all bases. 1254 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1255 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1256} 1257 1258/// \brief Determine whether the given base path includes a virtual 1259/// base class. 1260bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1261 for (CXXCastPath::const_iterator B = BasePath.begin(), 1262 BEnd = BasePath.end(); 1263 B != BEnd; ++B) 1264 if ((*B)->isVirtual()) 1265 return true; 1266 1267 return false; 1268} 1269 1270/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1271/// conversion (where Derived and Base are class types) is 1272/// well-formed, meaning that the conversion is unambiguous (and 1273/// that all of the base classes are accessible). Returns true 1274/// and emits a diagnostic if the code is ill-formed, returns false 1275/// otherwise. Loc is the location where this routine should point to 1276/// if there is an error, and Range is the source range to highlight 1277/// if there is an error. 1278bool 1279Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1280 unsigned InaccessibleBaseID, 1281 unsigned AmbigiousBaseConvID, 1282 SourceLocation Loc, SourceRange Range, 1283 DeclarationName Name, 1284 CXXCastPath *BasePath) { 1285 // First, determine whether the path from Derived to Base is 1286 // ambiguous. This is slightly more expensive than checking whether 1287 // the Derived to Base conversion exists, because here we need to 1288 // explore multiple paths to determine if there is an ambiguity. 1289 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1290 /*DetectVirtual=*/false); 1291 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1292 assert(DerivationOkay && 1293 "Can only be used with a derived-to-base conversion"); 1294 (void)DerivationOkay; 1295 1296 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1297 if (InaccessibleBaseID) { 1298 // Check that the base class can be accessed. 1299 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1300 InaccessibleBaseID)) { 1301 case AR_inaccessible: 1302 return true; 1303 case AR_accessible: 1304 case AR_dependent: 1305 case AR_delayed: 1306 break; 1307 } 1308 } 1309 1310 // Build a base path if necessary. 1311 if (BasePath) 1312 BuildBasePathArray(Paths, *BasePath); 1313 return false; 1314 } 1315 1316 // We know that the derived-to-base conversion is ambiguous, and 1317 // we're going to produce a diagnostic. Perform the derived-to-base 1318 // search just one more time to compute all of the possible paths so 1319 // that we can print them out. This is more expensive than any of 1320 // the previous derived-to-base checks we've done, but at this point 1321 // performance isn't as much of an issue. 1322 Paths.clear(); 1323 Paths.setRecordingPaths(true); 1324 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1325 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1326 (void)StillOkay; 1327 1328 // Build up a textual representation of the ambiguous paths, e.g., 1329 // D -> B -> A, that will be used to illustrate the ambiguous 1330 // conversions in the diagnostic. We only print one of the paths 1331 // to each base class subobject. 1332 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1333 1334 Diag(Loc, AmbigiousBaseConvID) 1335 << Derived << Base << PathDisplayStr << Range << Name; 1336 return true; 1337} 1338 1339bool 1340Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1341 SourceLocation Loc, SourceRange Range, 1342 CXXCastPath *BasePath, 1343 bool IgnoreAccess) { 1344 return CheckDerivedToBaseConversion(Derived, Base, 1345 IgnoreAccess ? 0 1346 : diag::err_upcast_to_inaccessible_base, 1347 diag::err_ambiguous_derived_to_base_conv, 1348 Loc, Range, DeclarationName(), 1349 BasePath); 1350} 1351 1352 1353/// @brief Builds a string representing ambiguous paths from a 1354/// specific derived class to different subobjects of the same base 1355/// class. 1356/// 1357/// This function builds a string that can be used in error messages 1358/// to show the different paths that one can take through the 1359/// inheritance hierarchy to go from the derived class to different 1360/// subobjects of a base class. The result looks something like this: 1361/// @code 1362/// struct D -> struct B -> struct A 1363/// struct D -> struct C -> struct A 1364/// @endcode 1365std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1366 std::string PathDisplayStr; 1367 std::set<unsigned> DisplayedPaths; 1368 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1369 Path != Paths.end(); ++Path) { 1370 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1371 // We haven't displayed a path to this particular base 1372 // class subobject yet. 1373 PathDisplayStr += "\n "; 1374 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1375 for (CXXBasePath::const_iterator Element = Path->begin(); 1376 Element != Path->end(); ++Element) 1377 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1378 } 1379 } 1380 1381 return PathDisplayStr; 1382} 1383 1384//===----------------------------------------------------------------------===// 1385// C++ class member Handling 1386//===----------------------------------------------------------------------===// 1387 1388/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1389bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1390 SourceLocation ASLoc, 1391 SourceLocation ColonLoc, 1392 AttributeList *Attrs) { 1393 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1394 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1395 ASLoc, ColonLoc); 1396 CurContext->addHiddenDecl(ASDecl); 1397 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1398} 1399 1400/// CheckOverrideControl - Check C++0x override control semantics. 1401void Sema::CheckOverrideControl(const Decl *D) { 1402 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1403 if (!MD || !MD->isVirtual()) 1404 return; 1405 1406 if (MD->isDependentContext()) 1407 return; 1408 1409 // C++0x [class.virtual]p3: 1410 // If a virtual function is marked with the virt-specifier override and does 1411 // not override a member function of a base class, 1412 // the program is ill-formed. 1413 bool HasOverriddenMethods = 1414 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1415 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1416 Diag(MD->getLocation(), 1417 diag::err_function_marked_override_not_overriding) 1418 << MD->getDeclName(); 1419 return; 1420 } 1421} 1422 1423/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1424/// function overrides a virtual member function marked 'final', according to 1425/// C++0x [class.virtual]p3. 1426bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1427 const CXXMethodDecl *Old) { 1428 if (!Old->hasAttr<FinalAttr>()) 1429 return false; 1430 1431 Diag(New->getLocation(), diag::err_final_function_overridden) 1432 << New->getDeclName(); 1433 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1434 return true; 1435} 1436 1437/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1438/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1439/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1440/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1441/// present but parsing it has been deferred. 1442Decl * 1443Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1444 MultiTemplateParamsArg TemplateParameterLists, 1445 Expr *BW, const VirtSpecifiers &VS, 1446 bool HasDeferredInit) { 1447 const DeclSpec &DS = D.getDeclSpec(); 1448 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1449 DeclarationName Name = NameInfo.getName(); 1450 SourceLocation Loc = NameInfo.getLoc(); 1451 1452 // For anonymous bitfields, the location should point to the type. 1453 if (Loc.isInvalid()) 1454 Loc = D.getSourceRange().getBegin(); 1455 1456 Expr *BitWidth = static_cast<Expr*>(BW); 1457 1458 assert(isa<CXXRecordDecl>(CurContext)); 1459 assert(!DS.isFriendSpecified()); 1460 1461 bool isFunc = D.isDeclarationOfFunction(); 1462 1463 // C++ 9.2p6: A member shall not be declared to have automatic storage 1464 // duration (auto, register) or with the extern storage-class-specifier. 1465 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1466 // data members and cannot be applied to names declared const or static, 1467 // and cannot be applied to reference members. 1468 switch (DS.getStorageClassSpec()) { 1469 case DeclSpec::SCS_unspecified: 1470 case DeclSpec::SCS_typedef: 1471 case DeclSpec::SCS_static: 1472 // FALL THROUGH. 1473 break; 1474 case DeclSpec::SCS_mutable: 1475 if (isFunc) { 1476 if (DS.getStorageClassSpecLoc().isValid()) 1477 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1478 else 1479 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1480 1481 // FIXME: It would be nicer if the keyword was ignored only for this 1482 // declarator. Otherwise we could get follow-up errors. 1483 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1484 } 1485 break; 1486 default: 1487 if (DS.getStorageClassSpecLoc().isValid()) 1488 Diag(DS.getStorageClassSpecLoc(), 1489 diag::err_storageclass_invalid_for_member); 1490 else 1491 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1492 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1493 } 1494 1495 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1496 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1497 !isFunc); 1498 1499 Decl *Member; 1500 if (isInstField) { 1501 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1502 1503 // Data members must have identifiers for names. 1504 if (Name.getNameKind() != DeclarationName::Identifier) { 1505 Diag(Loc, diag::err_bad_variable_name) 1506 << Name; 1507 return 0; 1508 } 1509 1510 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1511 1512 // Member field could not be with "template" keyword. 1513 // So TemplateParameterLists should be empty in this case. 1514 if (TemplateParameterLists.size()) { 1515 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1516 if (TemplateParams->size()) { 1517 // There is no such thing as a member field template. 1518 Diag(D.getIdentifierLoc(), diag::err_template_member) 1519 << II 1520 << SourceRange(TemplateParams->getTemplateLoc(), 1521 TemplateParams->getRAngleLoc()); 1522 } else { 1523 // There is an extraneous 'template<>' for this member. 1524 Diag(TemplateParams->getTemplateLoc(), 1525 diag::err_template_member_noparams) 1526 << II 1527 << SourceRange(TemplateParams->getTemplateLoc(), 1528 TemplateParams->getRAngleLoc()); 1529 } 1530 return 0; 1531 } 1532 1533 if (SS.isSet() && !SS.isInvalid()) { 1534 // The user provided a superfluous scope specifier inside a class 1535 // definition: 1536 // 1537 // class X { 1538 // int X::member; 1539 // }; 1540 DeclContext *DC = 0; 1541 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1542 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1543 << Name << FixItHint::CreateRemoval(SS.getRange()); 1544 else 1545 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1546 << Name << SS.getRange(); 1547 1548 SS.clear(); 1549 } 1550 1551 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1552 HasDeferredInit, AS); 1553 assert(Member && "HandleField never returns null"); 1554 } else { 1555 assert(!HasDeferredInit); 1556 1557 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1558 if (!Member) { 1559 return 0; 1560 } 1561 1562 // Non-instance-fields can't have a bitfield. 1563 if (BitWidth) { 1564 if (Member->isInvalidDecl()) { 1565 // don't emit another diagnostic. 1566 } else if (isa<VarDecl>(Member)) { 1567 // C++ 9.6p3: A bit-field shall not be a static member. 1568 // "static member 'A' cannot be a bit-field" 1569 Diag(Loc, diag::err_static_not_bitfield) 1570 << Name << BitWidth->getSourceRange(); 1571 } else if (isa<TypedefDecl>(Member)) { 1572 // "typedef member 'x' cannot be a bit-field" 1573 Diag(Loc, diag::err_typedef_not_bitfield) 1574 << Name << BitWidth->getSourceRange(); 1575 } else { 1576 // A function typedef ("typedef int f(); f a;"). 1577 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1578 Diag(Loc, diag::err_not_integral_type_bitfield) 1579 << Name << cast<ValueDecl>(Member)->getType() 1580 << BitWidth->getSourceRange(); 1581 } 1582 1583 BitWidth = 0; 1584 Member->setInvalidDecl(); 1585 } 1586 1587 Member->setAccess(AS); 1588 1589 // If we have declared a member function template, set the access of the 1590 // templated declaration as well. 1591 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1592 FunTmpl->getTemplatedDecl()->setAccess(AS); 1593 } 1594 1595 if (VS.isOverrideSpecified()) { 1596 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1597 if (!MD || !MD->isVirtual()) { 1598 Diag(Member->getLocStart(), 1599 diag::override_keyword_only_allowed_on_virtual_member_functions) 1600 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1601 } else 1602 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1603 } 1604 if (VS.isFinalSpecified()) { 1605 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1606 if (!MD || !MD->isVirtual()) { 1607 Diag(Member->getLocStart(), 1608 diag::override_keyword_only_allowed_on_virtual_member_functions) 1609 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1610 } else 1611 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1612 } 1613 1614 if (VS.getLastLocation().isValid()) { 1615 // Update the end location of a method that has a virt-specifiers. 1616 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1617 MD->setRangeEnd(VS.getLastLocation()); 1618 } 1619 1620 CheckOverrideControl(Member); 1621 1622 assert((Name || isInstField) && "No identifier for non-field ?"); 1623 1624 if (isInstField) 1625 FieldCollector->Add(cast<FieldDecl>(Member)); 1626 return Member; 1627} 1628 1629/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1630/// in-class initializer for a non-static C++ class member, and after 1631/// instantiating an in-class initializer in a class template. Such actions 1632/// are deferred until the class is complete. 1633void 1634Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1635 Expr *InitExpr) { 1636 FieldDecl *FD = cast<FieldDecl>(D); 1637 1638 if (!InitExpr) { 1639 FD->setInvalidDecl(); 1640 FD->removeInClassInitializer(); 1641 return; 1642 } 1643 1644 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1645 FD->setInvalidDecl(); 1646 FD->removeInClassInitializer(); 1647 return; 1648 } 1649 1650 ExprResult Init = InitExpr; 1651 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1652 // FIXME: if there is no EqualLoc, this is list-initialization. 1653 Init = PerformCopyInitialization( 1654 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1655 if (Init.isInvalid()) { 1656 FD->setInvalidDecl(); 1657 return; 1658 } 1659 1660 CheckImplicitConversions(Init.get(), EqualLoc); 1661 } 1662 1663 // C++0x [class.base.init]p7: 1664 // The initialization of each base and member constitutes a 1665 // full-expression. 1666 Init = MaybeCreateExprWithCleanups(Init); 1667 if (Init.isInvalid()) { 1668 FD->setInvalidDecl(); 1669 return; 1670 } 1671 1672 InitExpr = Init.release(); 1673 1674 FD->setInClassInitializer(InitExpr); 1675} 1676 1677/// \brief Find the direct and/or virtual base specifiers that 1678/// correspond to the given base type, for use in base initialization 1679/// within a constructor. 1680static bool FindBaseInitializer(Sema &SemaRef, 1681 CXXRecordDecl *ClassDecl, 1682 QualType BaseType, 1683 const CXXBaseSpecifier *&DirectBaseSpec, 1684 const CXXBaseSpecifier *&VirtualBaseSpec) { 1685 // First, check for a direct base class. 1686 DirectBaseSpec = 0; 1687 for (CXXRecordDecl::base_class_const_iterator Base 1688 = ClassDecl->bases_begin(); 1689 Base != ClassDecl->bases_end(); ++Base) { 1690 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1691 // We found a direct base of this type. That's what we're 1692 // initializing. 1693 DirectBaseSpec = &*Base; 1694 break; 1695 } 1696 } 1697 1698 // Check for a virtual base class. 1699 // FIXME: We might be able to short-circuit this if we know in advance that 1700 // there are no virtual bases. 1701 VirtualBaseSpec = 0; 1702 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1703 // We haven't found a base yet; search the class hierarchy for a 1704 // virtual base class. 1705 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1706 /*DetectVirtual=*/false); 1707 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1708 BaseType, Paths)) { 1709 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1710 Path != Paths.end(); ++Path) { 1711 if (Path->back().Base->isVirtual()) { 1712 VirtualBaseSpec = Path->back().Base; 1713 break; 1714 } 1715 } 1716 } 1717 } 1718 1719 return DirectBaseSpec || VirtualBaseSpec; 1720} 1721 1722/// \brief Handle a C++ member initializer using braced-init-list syntax. 1723MemInitResult 1724Sema::ActOnMemInitializer(Decl *ConstructorD, 1725 Scope *S, 1726 CXXScopeSpec &SS, 1727 IdentifierInfo *MemberOrBase, 1728 ParsedType TemplateTypeTy, 1729 const DeclSpec &DS, 1730 SourceLocation IdLoc, 1731 Expr *InitList, 1732 SourceLocation EllipsisLoc) { 1733 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1734 DS, IdLoc, InitList, 1735 EllipsisLoc); 1736} 1737 1738/// \brief Handle a C++ member initializer using parentheses syntax. 1739MemInitResult 1740Sema::ActOnMemInitializer(Decl *ConstructorD, 1741 Scope *S, 1742 CXXScopeSpec &SS, 1743 IdentifierInfo *MemberOrBase, 1744 ParsedType TemplateTypeTy, 1745 const DeclSpec &DS, 1746 SourceLocation IdLoc, 1747 SourceLocation LParenLoc, 1748 Expr **Args, unsigned NumArgs, 1749 SourceLocation RParenLoc, 1750 SourceLocation EllipsisLoc) { 1751 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1752 RParenLoc); 1753 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1754 DS, IdLoc, List, EllipsisLoc); 1755} 1756 1757namespace { 1758 1759// Callback to only accept typo corrections that can be a valid C++ member 1760// intializer: either a non-static field member or a base class. 1761class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1762 public: 1763 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1764 : ClassDecl(ClassDecl) {} 1765 1766 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1767 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1768 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1769 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1770 else 1771 return isa<TypeDecl>(ND); 1772 } 1773 return false; 1774 } 1775 1776 private: 1777 CXXRecordDecl *ClassDecl; 1778}; 1779 1780} 1781 1782/// \brief Handle a C++ member initializer. 1783MemInitResult 1784Sema::BuildMemInitializer(Decl *ConstructorD, 1785 Scope *S, 1786 CXXScopeSpec &SS, 1787 IdentifierInfo *MemberOrBase, 1788 ParsedType TemplateTypeTy, 1789 const DeclSpec &DS, 1790 SourceLocation IdLoc, 1791 Expr *Init, 1792 SourceLocation EllipsisLoc) { 1793 if (!ConstructorD) 1794 return true; 1795 1796 AdjustDeclIfTemplate(ConstructorD); 1797 1798 CXXConstructorDecl *Constructor 1799 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1800 if (!Constructor) { 1801 // The user wrote a constructor initializer on a function that is 1802 // not a C++ constructor. Ignore the error for now, because we may 1803 // have more member initializers coming; we'll diagnose it just 1804 // once in ActOnMemInitializers. 1805 return true; 1806 } 1807 1808 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1809 1810 // C++ [class.base.init]p2: 1811 // Names in a mem-initializer-id are looked up in the scope of the 1812 // constructor's class and, if not found in that scope, are looked 1813 // up in the scope containing the constructor's definition. 1814 // [Note: if the constructor's class contains a member with the 1815 // same name as a direct or virtual base class of the class, a 1816 // mem-initializer-id naming the member or base class and composed 1817 // of a single identifier refers to the class member. A 1818 // mem-initializer-id for the hidden base class may be specified 1819 // using a qualified name. ] 1820 if (!SS.getScopeRep() && !TemplateTypeTy) { 1821 // Look for a member, first. 1822 DeclContext::lookup_result Result 1823 = ClassDecl->lookup(MemberOrBase); 1824 if (Result.first != Result.second) { 1825 ValueDecl *Member; 1826 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1827 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1828 if (EllipsisLoc.isValid()) 1829 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1830 << MemberOrBase 1831 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1832 1833 return BuildMemberInitializer(Member, Init, IdLoc); 1834 } 1835 } 1836 } 1837 // It didn't name a member, so see if it names a class. 1838 QualType BaseType; 1839 TypeSourceInfo *TInfo = 0; 1840 1841 if (TemplateTypeTy) { 1842 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1843 } else if (DS.getTypeSpecType() == TST_decltype) { 1844 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1845 } else { 1846 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1847 LookupParsedName(R, S, &SS); 1848 1849 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1850 if (!TyD) { 1851 if (R.isAmbiguous()) return true; 1852 1853 // We don't want access-control diagnostics here. 1854 R.suppressDiagnostics(); 1855 1856 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1857 bool NotUnknownSpecialization = false; 1858 DeclContext *DC = computeDeclContext(SS, false); 1859 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1860 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1861 1862 if (!NotUnknownSpecialization) { 1863 // When the scope specifier can refer to a member of an unknown 1864 // specialization, we take it as a type name. 1865 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1866 SS.getWithLocInContext(Context), 1867 *MemberOrBase, IdLoc); 1868 if (BaseType.isNull()) 1869 return true; 1870 1871 R.clear(); 1872 R.setLookupName(MemberOrBase); 1873 } 1874 } 1875 1876 // If no results were found, try to correct typos. 1877 TypoCorrection Corr; 1878 MemInitializerValidatorCCC Validator(ClassDecl); 1879 if (R.empty() && BaseType.isNull() && 1880 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1881 Validator, ClassDecl))) { 1882 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1883 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1884 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1885 // We have found a non-static data member with a similar 1886 // name to what was typed; complain and initialize that 1887 // member. 1888 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1889 << MemberOrBase << true << CorrectedQuotedStr 1890 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1891 Diag(Member->getLocation(), diag::note_previous_decl) 1892 << CorrectedQuotedStr; 1893 1894 return BuildMemberInitializer(Member, Init, IdLoc); 1895 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1896 const CXXBaseSpecifier *DirectBaseSpec; 1897 const CXXBaseSpecifier *VirtualBaseSpec; 1898 if (FindBaseInitializer(*this, ClassDecl, 1899 Context.getTypeDeclType(Type), 1900 DirectBaseSpec, VirtualBaseSpec)) { 1901 // We have found a direct or virtual base class with a 1902 // similar name to what was typed; complain and initialize 1903 // that base class. 1904 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1905 << MemberOrBase << false << CorrectedQuotedStr 1906 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1907 1908 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1909 : VirtualBaseSpec; 1910 Diag(BaseSpec->getSourceRange().getBegin(), 1911 diag::note_base_class_specified_here) 1912 << BaseSpec->getType() 1913 << BaseSpec->getSourceRange(); 1914 1915 TyD = Type; 1916 } 1917 } 1918 } 1919 1920 if (!TyD && BaseType.isNull()) { 1921 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1922 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1923 return true; 1924 } 1925 } 1926 1927 if (BaseType.isNull()) { 1928 BaseType = Context.getTypeDeclType(TyD); 1929 if (SS.isSet()) { 1930 NestedNameSpecifier *Qualifier = 1931 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1932 1933 // FIXME: preserve source range information 1934 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1935 } 1936 } 1937 } 1938 1939 if (!TInfo) 1940 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1941 1942 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1943} 1944 1945/// Checks a member initializer expression for cases where reference (or 1946/// pointer) members are bound to by-value parameters (or their addresses). 1947static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1948 Expr *Init, 1949 SourceLocation IdLoc) { 1950 QualType MemberTy = Member->getType(); 1951 1952 // We only handle pointers and references currently. 1953 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1954 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1955 return; 1956 1957 const bool IsPointer = MemberTy->isPointerType(); 1958 if (IsPointer) { 1959 if (const UnaryOperator *Op 1960 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1961 // The only case we're worried about with pointers requires taking the 1962 // address. 1963 if (Op->getOpcode() != UO_AddrOf) 1964 return; 1965 1966 Init = Op->getSubExpr(); 1967 } else { 1968 // We only handle address-of expression initializers for pointers. 1969 return; 1970 } 1971 } 1972 1973 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1974 // Taking the address of a temporary will be diagnosed as a hard error. 1975 if (IsPointer) 1976 return; 1977 1978 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1979 << Member << Init->getSourceRange(); 1980 } else if (const DeclRefExpr *DRE 1981 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1982 // We only warn when referring to a non-reference parameter declaration. 1983 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1984 if (!Parameter || Parameter->getType()->isReferenceType()) 1985 return; 1986 1987 S.Diag(Init->getExprLoc(), 1988 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1989 : diag::warn_bind_ref_member_to_parameter) 1990 << Member << Parameter << Init->getSourceRange(); 1991 } else { 1992 // Other initializers are fine. 1993 return; 1994 } 1995 1996 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1997 << (unsigned)IsPointer; 1998} 1999 2000/// Checks an initializer expression for use of uninitialized fields, such as 2001/// containing the field that is being initialized. Returns true if there is an 2002/// uninitialized field was used an updates the SourceLocation parameter; false 2003/// otherwise. 2004static bool InitExprContainsUninitializedFields(const Stmt *S, 2005 const ValueDecl *LhsField, 2006 SourceLocation *L) { 2007 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2008 2009 if (isa<CallExpr>(S)) { 2010 // Do not descend into function calls or constructors, as the use 2011 // of an uninitialized field may be valid. One would have to inspect 2012 // the contents of the function/ctor to determine if it is safe or not. 2013 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2014 // may be safe, depending on what the function/ctor does. 2015 return false; 2016 } 2017 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2018 const NamedDecl *RhsField = ME->getMemberDecl(); 2019 2020 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2021 // The member expression points to a static data member. 2022 assert(VD->isStaticDataMember() && 2023 "Member points to non-static data member!"); 2024 (void)VD; 2025 return false; 2026 } 2027 2028 if (isa<EnumConstantDecl>(RhsField)) { 2029 // The member expression points to an enum. 2030 return false; 2031 } 2032 2033 if (RhsField == LhsField) { 2034 // Initializing a field with itself. Throw a warning. 2035 // But wait; there are exceptions! 2036 // Exception #1: The field may not belong to this record. 2037 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2038 const Expr *base = ME->getBase(); 2039 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2040 // Even though the field matches, it does not belong to this record. 2041 return false; 2042 } 2043 // None of the exceptions triggered; return true to indicate an 2044 // uninitialized field was used. 2045 *L = ME->getMemberLoc(); 2046 return true; 2047 } 2048 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2049 // sizeof/alignof doesn't reference contents, do not warn. 2050 return false; 2051 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2052 // address-of doesn't reference contents (the pointer may be dereferenced 2053 // in the same expression but it would be rare; and weird). 2054 if (UOE->getOpcode() == UO_AddrOf) 2055 return false; 2056 } 2057 for (Stmt::const_child_range it = S->children(); it; ++it) { 2058 if (!*it) { 2059 // An expression such as 'member(arg ?: "")' may trigger this. 2060 continue; 2061 } 2062 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2063 return true; 2064 } 2065 return false; 2066} 2067 2068MemInitResult 2069Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2070 SourceLocation IdLoc) { 2071 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2072 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2073 assert((DirectMember || IndirectMember) && 2074 "Member must be a FieldDecl or IndirectFieldDecl"); 2075 2076 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2077 return true; 2078 2079 if (Member->isInvalidDecl()) 2080 return true; 2081 2082 // Diagnose value-uses of fields to initialize themselves, e.g. 2083 // foo(foo) 2084 // where foo is not also a parameter to the constructor. 2085 // TODO: implement -Wuninitialized and fold this into that framework. 2086 Expr **Args; 2087 unsigned NumArgs; 2088 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2089 Args = ParenList->getExprs(); 2090 NumArgs = ParenList->getNumExprs(); 2091 } else { 2092 InitListExpr *InitList = cast<InitListExpr>(Init); 2093 Args = InitList->getInits(); 2094 NumArgs = InitList->getNumInits(); 2095 } 2096 for (unsigned i = 0; i < NumArgs; ++i) { 2097 SourceLocation L; 2098 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2099 // FIXME: Return true in the case when other fields are used before being 2100 // uninitialized. For example, let this field be the i'th field. When 2101 // initializing the i'th field, throw a warning if any of the >= i'th 2102 // fields are used, as they are not yet initialized. 2103 // Right now we are only handling the case where the i'th field uses 2104 // itself in its initializer. 2105 Diag(L, diag::warn_field_is_uninit); 2106 } 2107 } 2108 2109 SourceRange InitRange = Init->getSourceRange(); 2110 2111 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2112 // Can't check initialization for a member of dependent type or when 2113 // any of the arguments are type-dependent expressions. 2114 DiscardCleanupsInEvaluationContext(); 2115 } else { 2116 bool InitList = false; 2117 if (isa<InitListExpr>(Init)) { 2118 InitList = true; 2119 Args = &Init; 2120 NumArgs = 1; 2121 } 2122 2123 // Initialize the member. 2124 InitializedEntity MemberEntity = 2125 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2126 : InitializedEntity::InitializeMember(IndirectMember, 0); 2127 InitializationKind Kind = 2128 InitList ? InitializationKind::CreateDirectList(IdLoc) 2129 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2130 InitRange.getEnd()); 2131 2132 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2133 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2134 MultiExprArg(*this, Args, NumArgs), 2135 0); 2136 if (MemberInit.isInvalid()) 2137 return true; 2138 2139 CheckImplicitConversions(MemberInit.get(), 2140 InitRange.getBegin()); 2141 2142 // C++0x [class.base.init]p7: 2143 // The initialization of each base and member constitutes a 2144 // full-expression. 2145 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2146 if (MemberInit.isInvalid()) 2147 return true; 2148 2149 // If we are in a dependent context, template instantiation will 2150 // perform this type-checking again. Just save the arguments that we 2151 // received. 2152 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2153 // of the information that we have about the member 2154 // initializer. However, deconstructing the ASTs is a dicey process, 2155 // and this approach is far more likely to get the corner cases right. 2156 if (CurContext->isDependentContext()) { 2157 // The existing Init will do fine. 2158 } else { 2159 Init = MemberInit.get(); 2160 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2161 } 2162 } 2163 2164 if (DirectMember) { 2165 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2166 InitRange.getBegin(), Init, 2167 InitRange.getEnd()); 2168 } else { 2169 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2170 InitRange.getBegin(), Init, 2171 InitRange.getEnd()); 2172 } 2173} 2174 2175MemInitResult 2176Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2177 CXXRecordDecl *ClassDecl) { 2178 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2179 if (!LangOpts.CPlusPlus0x) 2180 return Diag(NameLoc, diag::err_delegating_ctor) 2181 << TInfo->getTypeLoc().getLocalSourceRange(); 2182 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2183 2184 bool InitList = true; 2185 Expr **Args = &Init; 2186 unsigned NumArgs = 1; 2187 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2188 InitList = false; 2189 Args = ParenList->getExprs(); 2190 NumArgs = ParenList->getNumExprs(); 2191 } 2192 2193 SourceRange InitRange = Init->getSourceRange(); 2194 // Initialize the object. 2195 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2196 QualType(ClassDecl->getTypeForDecl(), 0)); 2197 InitializationKind Kind = 2198 InitList ? InitializationKind::CreateDirectList(NameLoc) 2199 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2200 InitRange.getEnd()); 2201 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2202 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2203 MultiExprArg(*this, Args,NumArgs), 2204 0); 2205 if (DelegationInit.isInvalid()) 2206 return true; 2207 2208 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2209 "Delegating constructor with no target?"); 2210 2211 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2212 2213 // C++0x [class.base.init]p7: 2214 // The initialization of each base and member constitutes a 2215 // full-expression. 2216 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2217 if (DelegationInit.isInvalid()) 2218 return true; 2219 2220 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2221 DelegationInit.takeAs<Expr>(), 2222 InitRange.getEnd()); 2223} 2224 2225MemInitResult 2226Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2227 Expr *Init, CXXRecordDecl *ClassDecl, 2228 SourceLocation EllipsisLoc) { 2229 SourceLocation BaseLoc 2230 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2231 2232 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2233 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2234 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2235 2236 // C++ [class.base.init]p2: 2237 // [...] Unless the mem-initializer-id names a nonstatic data 2238 // member of the constructor's class or a direct or virtual base 2239 // of that class, the mem-initializer is ill-formed. A 2240 // mem-initializer-list can initialize a base class using any 2241 // name that denotes that base class type. 2242 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2243 2244 SourceRange InitRange = Init->getSourceRange(); 2245 if (EllipsisLoc.isValid()) { 2246 // This is a pack expansion. 2247 if (!BaseType->containsUnexpandedParameterPack()) { 2248 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2249 << SourceRange(BaseLoc, InitRange.getEnd()); 2250 2251 EllipsisLoc = SourceLocation(); 2252 } 2253 } else { 2254 // Check for any unexpanded parameter packs. 2255 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2256 return true; 2257 2258 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2259 return true; 2260 } 2261 2262 // Check for direct and virtual base classes. 2263 const CXXBaseSpecifier *DirectBaseSpec = 0; 2264 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2265 if (!Dependent) { 2266 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2267 BaseType)) 2268 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2269 2270 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2271 VirtualBaseSpec); 2272 2273 // C++ [base.class.init]p2: 2274 // Unless the mem-initializer-id names a nonstatic data member of the 2275 // constructor's class or a direct or virtual base of that class, the 2276 // mem-initializer is ill-formed. 2277 if (!DirectBaseSpec && !VirtualBaseSpec) { 2278 // If the class has any dependent bases, then it's possible that 2279 // one of those types will resolve to the same type as 2280 // BaseType. Therefore, just treat this as a dependent base 2281 // class initialization. FIXME: Should we try to check the 2282 // initialization anyway? It seems odd. 2283 if (ClassDecl->hasAnyDependentBases()) 2284 Dependent = true; 2285 else 2286 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2287 << BaseType << Context.getTypeDeclType(ClassDecl) 2288 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2289 } 2290 } 2291 2292 if (Dependent) { 2293 DiscardCleanupsInEvaluationContext(); 2294 2295 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2296 /*IsVirtual=*/false, 2297 InitRange.getBegin(), Init, 2298 InitRange.getEnd(), EllipsisLoc); 2299 } 2300 2301 // C++ [base.class.init]p2: 2302 // If a mem-initializer-id is ambiguous because it designates both 2303 // a direct non-virtual base class and an inherited virtual base 2304 // class, the mem-initializer is ill-formed. 2305 if (DirectBaseSpec && VirtualBaseSpec) 2306 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2307 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2308 2309 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2310 if (!BaseSpec) 2311 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2312 2313 // Initialize the base. 2314 bool InitList = true; 2315 Expr **Args = &Init; 2316 unsigned NumArgs = 1; 2317 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2318 InitList = false; 2319 Args = ParenList->getExprs(); 2320 NumArgs = ParenList->getNumExprs(); 2321 } 2322 2323 InitializedEntity BaseEntity = 2324 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2325 InitializationKind Kind = 2326 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2327 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2328 InitRange.getEnd()); 2329 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2330 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2331 MultiExprArg(*this, Args, NumArgs), 2332 0); 2333 if (BaseInit.isInvalid()) 2334 return true; 2335 2336 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2337 2338 // C++0x [class.base.init]p7: 2339 // The initialization of each base and member constitutes a 2340 // full-expression. 2341 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2342 if (BaseInit.isInvalid()) 2343 return true; 2344 2345 // If we are in a dependent context, template instantiation will 2346 // perform this type-checking again. Just save the arguments that we 2347 // received in a ParenListExpr. 2348 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2349 // of the information that we have about the base 2350 // initializer. However, deconstructing the ASTs is a dicey process, 2351 // and this approach is far more likely to get the corner cases right. 2352 if (CurContext->isDependentContext()) 2353 BaseInit = Owned(Init); 2354 2355 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2356 BaseSpec->isVirtual(), 2357 InitRange.getBegin(), 2358 BaseInit.takeAs<Expr>(), 2359 InitRange.getEnd(), EllipsisLoc); 2360} 2361 2362// Create a static_cast\<T&&>(expr). 2363static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2364 QualType ExprType = E->getType(); 2365 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2366 SourceLocation ExprLoc = E->getLocStart(); 2367 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2368 TargetType, ExprLoc); 2369 2370 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2371 SourceRange(ExprLoc, ExprLoc), 2372 E->getSourceRange()).take(); 2373} 2374 2375/// ImplicitInitializerKind - How an implicit base or member initializer should 2376/// initialize its base or member. 2377enum ImplicitInitializerKind { 2378 IIK_Default, 2379 IIK_Copy, 2380 IIK_Move 2381}; 2382 2383static bool 2384BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2385 ImplicitInitializerKind ImplicitInitKind, 2386 CXXBaseSpecifier *BaseSpec, 2387 bool IsInheritedVirtualBase, 2388 CXXCtorInitializer *&CXXBaseInit) { 2389 InitializedEntity InitEntity 2390 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2391 IsInheritedVirtualBase); 2392 2393 ExprResult BaseInit; 2394 2395 switch (ImplicitInitKind) { 2396 case IIK_Default: { 2397 InitializationKind InitKind 2398 = InitializationKind::CreateDefault(Constructor->getLocation()); 2399 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2400 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2401 MultiExprArg(SemaRef, 0, 0)); 2402 break; 2403 } 2404 2405 case IIK_Move: 2406 case IIK_Copy: { 2407 bool Moving = ImplicitInitKind == IIK_Move; 2408 ParmVarDecl *Param = Constructor->getParamDecl(0); 2409 QualType ParamType = Param->getType().getNonReferenceType(); 2410 2411 Expr *CopyCtorArg = 2412 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2413 SourceLocation(), Param, 2414 Constructor->getLocation(), ParamType, 2415 VK_LValue, 0); 2416 2417 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2418 2419 // Cast to the base class to avoid ambiguities. 2420 QualType ArgTy = 2421 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2422 ParamType.getQualifiers()); 2423 2424 if (Moving) { 2425 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2426 } 2427 2428 CXXCastPath BasePath; 2429 BasePath.push_back(BaseSpec); 2430 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2431 CK_UncheckedDerivedToBase, 2432 Moving ? VK_XValue : VK_LValue, 2433 &BasePath).take(); 2434 2435 InitializationKind InitKind 2436 = InitializationKind::CreateDirect(Constructor->getLocation(), 2437 SourceLocation(), SourceLocation()); 2438 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2439 &CopyCtorArg, 1); 2440 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2441 MultiExprArg(&CopyCtorArg, 1)); 2442 break; 2443 } 2444 } 2445 2446 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2447 if (BaseInit.isInvalid()) 2448 return true; 2449 2450 CXXBaseInit = 2451 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2452 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2453 SourceLocation()), 2454 BaseSpec->isVirtual(), 2455 SourceLocation(), 2456 BaseInit.takeAs<Expr>(), 2457 SourceLocation(), 2458 SourceLocation()); 2459 2460 return false; 2461} 2462 2463static bool RefersToRValueRef(Expr *MemRef) { 2464 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2465 return Referenced->getType()->isRValueReferenceType(); 2466} 2467 2468static bool 2469BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2470 ImplicitInitializerKind ImplicitInitKind, 2471 FieldDecl *Field, IndirectFieldDecl *Indirect, 2472 CXXCtorInitializer *&CXXMemberInit) { 2473 if (Field->isInvalidDecl()) 2474 return true; 2475 2476 SourceLocation Loc = Constructor->getLocation(); 2477 2478 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2479 bool Moving = ImplicitInitKind == IIK_Move; 2480 ParmVarDecl *Param = Constructor->getParamDecl(0); 2481 QualType ParamType = Param->getType().getNonReferenceType(); 2482 2483 // Suppress copying zero-width bitfields. 2484 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2485 return false; 2486 2487 Expr *MemberExprBase = 2488 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2489 SourceLocation(), Param, 2490 Loc, ParamType, VK_LValue, 0); 2491 2492 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2493 2494 if (Moving) { 2495 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2496 } 2497 2498 // Build a reference to this field within the parameter. 2499 CXXScopeSpec SS; 2500 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2501 Sema::LookupMemberName); 2502 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2503 : cast<ValueDecl>(Field), AS_public); 2504 MemberLookup.resolveKind(); 2505 ExprResult CtorArg 2506 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2507 ParamType, Loc, 2508 /*IsArrow=*/false, 2509 SS, 2510 /*TemplateKWLoc=*/SourceLocation(), 2511 /*FirstQualifierInScope=*/0, 2512 MemberLookup, 2513 /*TemplateArgs=*/0); 2514 if (CtorArg.isInvalid()) 2515 return true; 2516 2517 // C++11 [class.copy]p15: 2518 // - if a member m has rvalue reference type T&&, it is direct-initialized 2519 // with static_cast<T&&>(x.m); 2520 if (RefersToRValueRef(CtorArg.get())) { 2521 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2522 } 2523 2524 // When the field we are copying is an array, create index variables for 2525 // each dimension of the array. We use these index variables to subscript 2526 // the source array, and other clients (e.g., CodeGen) will perform the 2527 // necessary iteration with these index variables. 2528 SmallVector<VarDecl *, 4> IndexVariables; 2529 QualType BaseType = Field->getType(); 2530 QualType SizeType = SemaRef.Context.getSizeType(); 2531 bool InitializingArray = false; 2532 while (const ConstantArrayType *Array 2533 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2534 InitializingArray = true; 2535 // Create the iteration variable for this array index. 2536 IdentifierInfo *IterationVarName = 0; 2537 { 2538 SmallString<8> Str; 2539 llvm::raw_svector_ostream OS(Str); 2540 OS << "__i" << IndexVariables.size(); 2541 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2542 } 2543 VarDecl *IterationVar 2544 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2545 IterationVarName, SizeType, 2546 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2547 SC_None, SC_None); 2548 IndexVariables.push_back(IterationVar); 2549 2550 // Create a reference to the iteration variable. 2551 ExprResult IterationVarRef 2552 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2553 assert(!IterationVarRef.isInvalid() && 2554 "Reference to invented variable cannot fail!"); 2555 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2556 assert(!IterationVarRef.isInvalid() && 2557 "Conversion of invented variable cannot fail!"); 2558 2559 // Subscript the array with this iteration variable. 2560 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2561 IterationVarRef.take(), 2562 Loc); 2563 if (CtorArg.isInvalid()) 2564 return true; 2565 2566 BaseType = Array->getElementType(); 2567 } 2568 2569 // The array subscript expression is an lvalue, which is wrong for moving. 2570 if (Moving && InitializingArray) 2571 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2572 2573 // Construct the entity that we will be initializing. For an array, this 2574 // will be first element in the array, which may require several levels 2575 // of array-subscript entities. 2576 SmallVector<InitializedEntity, 4> Entities; 2577 Entities.reserve(1 + IndexVariables.size()); 2578 if (Indirect) 2579 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2580 else 2581 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2582 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2583 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2584 0, 2585 Entities.back())); 2586 2587 // Direct-initialize to use the copy constructor. 2588 InitializationKind InitKind = 2589 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2590 2591 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2592 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2593 &CtorArgE, 1); 2594 2595 ExprResult MemberInit 2596 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2597 MultiExprArg(&CtorArgE, 1)); 2598 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2599 if (MemberInit.isInvalid()) 2600 return true; 2601 2602 if (Indirect) { 2603 assert(IndexVariables.size() == 0 && 2604 "Indirect field improperly initialized"); 2605 CXXMemberInit 2606 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2607 Loc, Loc, 2608 MemberInit.takeAs<Expr>(), 2609 Loc); 2610 } else 2611 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2612 Loc, MemberInit.takeAs<Expr>(), 2613 Loc, 2614 IndexVariables.data(), 2615 IndexVariables.size()); 2616 return false; 2617 } 2618 2619 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2620 2621 QualType FieldBaseElementType = 2622 SemaRef.Context.getBaseElementType(Field->getType()); 2623 2624 if (FieldBaseElementType->isRecordType()) { 2625 InitializedEntity InitEntity 2626 = Indirect? InitializedEntity::InitializeMember(Indirect) 2627 : InitializedEntity::InitializeMember(Field); 2628 InitializationKind InitKind = 2629 InitializationKind::CreateDefault(Loc); 2630 2631 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2632 ExprResult MemberInit = 2633 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2634 2635 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2636 if (MemberInit.isInvalid()) 2637 return true; 2638 2639 if (Indirect) 2640 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2641 Indirect, Loc, 2642 Loc, 2643 MemberInit.get(), 2644 Loc); 2645 else 2646 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2647 Field, Loc, Loc, 2648 MemberInit.get(), 2649 Loc); 2650 return false; 2651 } 2652 2653 if (!Field->getParent()->isUnion()) { 2654 if (FieldBaseElementType->isReferenceType()) { 2655 SemaRef.Diag(Constructor->getLocation(), 2656 diag::err_uninitialized_member_in_ctor) 2657 << (int)Constructor->isImplicit() 2658 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2659 << 0 << Field->getDeclName(); 2660 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2661 return true; 2662 } 2663 2664 if (FieldBaseElementType.isConstQualified()) { 2665 SemaRef.Diag(Constructor->getLocation(), 2666 diag::err_uninitialized_member_in_ctor) 2667 << (int)Constructor->isImplicit() 2668 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2669 << 1 << Field->getDeclName(); 2670 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2671 return true; 2672 } 2673 } 2674 2675 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2676 FieldBaseElementType->isObjCRetainableType() && 2677 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2678 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2679 // Instant objects: 2680 // Default-initialize Objective-C pointers to NULL. 2681 CXXMemberInit 2682 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2683 Loc, Loc, 2684 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2685 Loc); 2686 return false; 2687 } 2688 2689 // Nothing to initialize. 2690 CXXMemberInit = 0; 2691 return false; 2692} 2693 2694namespace { 2695struct BaseAndFieldInfo { 2696 Sema &S; 2697 CXXConstructorDecl *Ctor; 2698 bool AnyErrorsInInits; 2699 ImplicitInitializerKind IIK; 2700 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2701 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2702 2703 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2704 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2705 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2706 if (Generated && Ctor->isCopyConstructor()) 2707 IIK = IIK_Copy; 2708 else if (Generated && Ctor->isMoveConstructor()) 2709 IIK = IIK_Move; 2710 else 2711 IIK = IIK_Default; 2712 } 2713 2714 bool isImplicitCopyOrMove() const { 2715 switch (IIK) { 2716 case IIK_Copy: 2717 case IIK_Move: 2718 return true; 2719 2720 case IIK_Default: 2721 return false; 2722 } 2723 2724 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2725 } 2726}; 2727} 2728 2729/// \brief Determine whether the given indirect field declaration is somewhere 2730/// within an anonymous union. 2731static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2732 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2733 CEnd = F->chain_end(); 2734 C != CEnd; ++C) 2735 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2736 if (Record->isUnion()) 2737 return true; 2738 2739 return false; 2740} 2741 2742/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2743/// array type. 2744static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2745 if (T->isIncompleteArrayType()) 2746 return true; 2747 2748 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2749 if (!ArrayT->getSize()) 2750 return true; 2751 2752 T = ArrayT->getElementType(); 2753 } 2754 2755 return false; 2756} 2757 2758static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2759 FieldDecl *Field, 2760 IndirectFieldDecl *Indirect = 0) { 2761 2762 // Overwhelmingly common case: we have a direct initializer for this field. 2763 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2764 Info.AllToInit.push_back(Init); 2765 return false; 2766 } 2767 2768 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2769 // has a brace-or-equal-initializer, the entity is initialized as specified 2770 // in [dcl.init]. 2771 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2772 CXXCtorInitializer *Init; 2773 if (Indirect) 2774 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2775 SourceLocation(), 2776 SourceLocation(), 0, 2777 SourceLocation()); 2778 else 2779 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2780 SourceLocation(), 2781 SourceLocation(), 0, 2782 SourceLocation()); 2783 Info.AllToInit.push_back(Init); 2784 return false; 2785 } 2786 2787 // Don't build an implicit initializer for union members if none was 2788 // explicitly specified. 2789 if (Field->getParent()->isUnion() || 2790 (Indirect && isWithinAnonymousUnion(Indirect))) 2791 return false; 2792 2793 // Don't initialize incomplete or zero-length arrays. 2794 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2795 return false; 2796 2797 // Don't try to build an implicit initializer if there were semantic 2798 // errors in any of the initializers (and therefore we might be 2799 // missing some that the user actually wrote). 2800 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2801 return false; 2802 2803 CXXCtorInitializer *Init = 0; 2804 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2805 Indirect, Init)) 2806 return true; 2807 2808 if (Init) 2809 Info.AllToInit.push_back(Init); 2810 2811 return false; 2812} 2813 2814bool 2815Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2816 CXXCtorInitializer *Initializer) { 2817 assert(Initializer->isDelegatingInitializer()); 2818 Constructor->setNumCtorInitializers(1); 2819 CXXCtorInitializer **initializer = 2820 new (Context) CXXCtorInitializer*[1]; 2821 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2822 Constructor->setCtorInitializers(initializer); 2823 2824 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2825 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2826 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2827 } 2828 2829 DelegatingCtorDecls.push_back(Constructor); 2830 2831 return false; 2832} 2833 2834bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2835 CXXCtorInitializer **Initializers, 2836 unsigned NumInitializers, 2837 bool AnyErrors) { 2838 if (Constructor->isDependentContext()) { 2839 // Just store the initializers as written, they will be checked during 2840 // instantiation. 2841 if (NumInitializers > 0) { 2842 Constructor->setNumCtorInitializers(NumInitializers); 2843 CXXCtorInitializer **baseOrMemberInitializers = 2844 new (Context) CXXCtorInitializer*[NumInitializers]; 2845 memcpy(baseOrMemberInitializers, Initializers, 2846 NumInitializers * sizeof(CXXCtorInitializer*)); 2847 Constructor->setCtorInitializers(baseOrMemberInitializers); 2848 } 2849 2850 return false; 2851 } 2852 2853 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2854 2855 // We need to build the initializer AST according to order of construction 2856 // and not what user specified in the Initializers list. 2857 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2858 if (!ClassDecl) 2859 return true; 2860 2861 bool HadError = false; 2862 2863 for (unsigned i = 0; i < NumInitializers; i++) { 2864 CXXCtorInitializer *Member = Initializers[i]; 2865 2866 if (Member->isBaseInitializer()) 2867 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2868 else 2869 Info.AllBaseFields[Member->getAnyMember()] = Member; 2870 } 2871 2872 // Keep track of the direct virtual bases. 2873 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2874 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2875 E = ClassDecl->bases_end(); I != E; ++I) { 2876 if (I->isVirtual()) 2877 DirectVBases.insert(I); 2878 } 2879 2880 // Push virtual bases before others. 2881 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2882 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2883 2884 if (CXXCtorInitializer *Value 2885 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2886 Info.AllToInit.push_back(Value); 2887 } else if (!AnyErrors) { 2888 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2889 CXXCtorInitializer *CXXBaseInit; 2890 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2891 VBase, IsInheritedVirtualBase, 2892 CXXBaseInit)) { 2893 HadError = true; 2894 continue; 2895 } 2896 2897 Info.AllToInit.push_back(CXXBaseInit); 2898 } 2899 } 2900 2901 // Non-virtual bases. 2902 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2903 E = ClassDecl->bases_end(); Base != E; ++Base) { 2904 // Virtuals are in the virtual base list and already constructed. 2905 if (Base->isVirtual()) 2906 continue; 2907 2908 if (CXXCtorInitializer *Value 2909 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2910 Info.AllToInit.push_back(Value); 2911 } else if (!AnyErrors) { 2912 CXXCtorInitializer *CXXBaseInit; 2913 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2914 Base, /*IsInheritedVirtualBase=*/false, 2915 CXXBaseInit)) { 2916 HadError = true; 2917 continue; 2918 } 2919 2920 Info.AllToInit.push_back(CXXBaseInit); 2921 } 2922 } 2923 2924 // Fields. 2925 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2926 MemEnd = ClassDecl->decls_end(); 2927 Mem != MemEnd; ++Mem) { 2928 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2929 // C++ [class.bit]p2: 2930 // A declaration for a bit-field that omits the identifier declares an 2931 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2932 // initialized. 2933 if (F->isUnnamedBitfield()) 2934 continue; 2935 2936 // If we're not generating the implicit copy/move constructor, then we'll 2937 // handle anonymous struct/union fields based on their individual 2938 // indirect fields. 2939 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2940 continue; 2941 2942 if (CollectFieldInitializer(*this, Info, F)) 2943 HadError = true; 2944 continue; 2945 } 2946 2947 // Beyond this point, we only consider default initialization. 2948 if (Info.IIK != IIK_Default) 2949 continue; 2950 2951 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2952 if (F->getType()->isIncompleteArrayType()) { 2953 assert(ClassDecl->hasFlexibleArrayMember() && 2954 "Incomplete array type is not valid"); 2955 continue; 2956 } 2957 2958 // Initialize each field of an anonymous struct individually. 2959 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2960 HadError = true; 2961 2962 continue; 2963 } 2964 } 2965 2966 NumInitializers = Info.AllToInit.size(); 2967 if (NumInitializers > 0) { 2968 Constructor->setNumCtorInitializers(NumInitializers); 2969 CXXCtorInitializer **baseOrMemberInitializers = 2970 new (Context) CXXCtorInitializer*[NumInitializers]; 2971 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2972 NumInitializers * sizeof(CXXCtorInitializer*)); 2973 Constructor->setCtorInitializers(baseOrMemberInitializers); 2974 2975 // Constructors implicitly reference the base and member 2976 // destructors. 2977 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2978 Constructor->getParent()); 2979 } 2980 2981 return HadError; 2982} 2983 2984static void *GetKeyForTopLevelField(FieldDecl *Field) { 2985 // For anonymous unions, use the class declaration as the key. 2986 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2987 if (RT->getDecl()->isAnonymousStructOrUnion()) 2988 return static_cast<void *>(RT->getDecl()); 2989 } 2990 return static_cast<void *>(Field); 2991} 2992 2993static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2994 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2995} 2996 2997static void *GetKeyForMember(ASTContext &Context, 2998 CXXCtorInitializer *Member) { 2999 if (!Member->isAnyMemberInitializer()) 3000 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3001 3002 // For fields injected into the class via declaration of an anonymous union, 3003 // use its anonymous union class declaration as the unique key. 3004 FieldDecl *Field = Member->getAnyMember(); 3005 3006 // If the field is a member of an anonymous struct or union, our key 3007 // is the anonymous record decl that's a direct child of the class. 3008 RecordDecl *RD = Field->getParent(); 3009 if (RD->isAnonymousStructOrUnion()) { 3010 while (true) { 3011 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3012 if (Parent->isAnonymousStructOrUnion()) 3013 RD = Parent; 3014 else 3015 break; 3016 } 3017 3018 return static_cast<void *>(RD); 3019 } 3020 3021 return static_cast<void *>(Field); 3022} 3023 3024static void 3025DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3026 const CXXConstructorDecl *Constructor, 3027 CXXCtorInitializer **Inits, 3028 unsigned NumInits) { 3029 if (Constructor->getDeclContext()->isDependentContext()) 3030 return; 3031 3032 // Don't check initializers order unless the warning is enabled at the 3033 // location of at least one initializer. 3034 bool ShouldCheckOrder = false; 3035 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3036 CXXCtorInitializer *Init = Inits[InitIndex]; 3037 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3038 Init->getSourceLocation()) 3039 != DiagnosticsEngine::Ignored) { 3040 ShouldCheckOrder = true; 3041 break; 3042 } 3043 } 3044 if (!ShouldCheckOrder) 3045 return; 3046 3047 // Build the list of bases and members in the order that they'll 3048 // actually be initialized. The explicit initializers should be in 3049 // this same order but may be missing things. 3050 SmallVector<const void*, 32> IdealInitKeys; 3051 3052 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3053 3054 // 1. Virtual bases. 3055 for (CXXRecordDecl::base_class_const_iterator VBase = 3056 ClassDecl->vbases_begin(), 3057 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3058 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3059 3060 // 2. Non-virtual bases. 3061 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3062 E = ClassDecl->bases_end(); Base != E; ++Base) { 3063 if (Base->isVirtual()) 3064 continue; 3065 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3066 } 3067 3068 // 3. Direct fields. 3069 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3070 E = ClassDecl->field_end(); Field != E; ++Field) { 3071 if (Field->isUnnamedBitfield()) 3072 continue; 3073 3074 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3075 } 3076 3077 unsigned NumIdealInits = IdealInitKeys.size(); 3078 unsigned IdealIndex = 0; 3079 3080 CXXCtorInitializer *PrevInit = 0; 3081 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3082 CXXCtorInitializer *Init = Inits[InitIndex]; 3083 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3084 3085 // Scan forward to try to find this initializer in the idealized 3086 // initializers list. 3087 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3088 if (InitKey == IdealInitKeys[IdealIndex]) 3089 break; 3090 3091 // If we didn't find this initializer, it must be because we 3092 // scanned past it on a previous iteration. That can only 3093 // happen if we're out of order; emit a warning. 3094 if (IdealIndex == NumIdealInits && PrevInit) { 3095 Sema::SemaDiagnosticBuilder D = 3096 SemaRef.Diag(PrevInit->getSourceLocation(), 3097 diag::warn_initializer_out_of_order); 3098 3099 if (PrevInit->isAnyMemberInitializer()) 3100 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3101 else 3102 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3103 3104 if (Init->isAnyMemberInitializer()) 3105 D << 0 << Init->getAnyMember()->getDeclName(); 3106 else 3107 D << 1 << Init->getTypeSourceInfo()->getType(); 3108 3109 // Move back to the initializer's location in the ideal list. 3110 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3111 if (InitKey == IdealInitKeys[IdealIndex]) 3112 break; 3113 3114 assert(IdealIndex != NumIdealInits && 3115 "initializer not found in initializer list"); 3116 } 3117 3118 PrevInit = Init; 3119 } 3120} 3121 3122namespace { 3123bool CheckRedundantInit(Sema &S, 3124 CXXCtorInitializer *Init, 3125 CXXCtorInitializer *&PrevInit) { 3126 if (!PrevInit) { 3127 PrevInit = Init; 3128 return false; 3129 } 3130 3131 if (FieldDecl *Field = Init->getMember()) 3132 S.Diag(Init->getSourceLocation(), 3133 diag::err_multiple_mem_initialization) 3134 << Field->getDeclName() 3135 << Init->getSourceRange(); 3136 else { 3137 const Type *BaseClass = Init->getBaseClass(); 3138 assert(BaseClass && "neither field nor base"); 3139 S.Diag(Init->getSourceLocation(), 3140 diag::err_multiple_base_initialization) 3141 << QualType(BaseClass, 0) 3142 << Init->getSourceRange(); 3143 } 3144 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3145 << 0 << PrevInit->getSourceRange(); 3146 3147 return true; 3148} 3149 3150typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3151typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3152 3153bool CheckRedundantUnionInit(Sema &S, 3154 CXXCtorInitializer *Init, 3155 RedundantUnionMap &Unions) { 3156 FieldDecl *Field = Init->getAnyMember(); 3157 RecordDecl *Parent = Field->getParent(); 3158 NamedDecl *Child = Field; 3159 3160 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3161 if (Parent->isUnion()) { 3162 UnionEntry &En = Unions[Parent]; 3163 if (En.first && En.first != Child) { 3164 S.Diag(Init->getSourceLocation(), 3165 diag::err_multiple_mem_union_initialization) 3166 << Field->getDeclName() 3167 << Init->getSourceRange(); 3168 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3169 << 0 << En.second->getSourceRange(); 3170 return true; 3171 } 3172 if (!En.first) { 3173 En.first = Child; 3174 En.second = Init; 3175 } 3176 if (!Parent->isAnonymousStructOrUnion()) 3177 return false; 3178 } 3179 3180 Child = Parent; 3181 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3182 } 3183 3184 return false; 3185} 3186} 3187 3188/// ActOnMemInitializers - Handle the member initializers for a constructor. 3189void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3190 SourceLocation ColonLoc, 3191 CXXCtorInitializer **meminits, 3192 unsigned NumMemInits, 3193 bool AnyErrors) { 3194 if (!ConstructorDecl) 3195 return; 3196 3197 AdjustDeclIfTemplate(ConstructorDecl); 3198 3199 CXXConstructorDecl *Constructor 3200 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3201 3202 if (!Constructor) { 3203 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3204 return; 3205 } 3206 3207 CXXCtorInitializer **MemInits = 3208 reinterpret_cast<CXXCtorInitializer **>(meminits); 3209 3210 // Mapping for the duplicate initializers check. 3211 // For member initializers, this is keyed with a FieldDecl*. 3212 // For base initializers, this is keyed with a Type*. 3213 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3214 3215 // Mapping for the inconsistent anonymous-union initializers check. 3216 RedundantUnionMap MemberUnions; 3217 3218 bool HadError = false; 3219 for (unsigned i = 0; i < NumMemInits; i++) { 3220 CXXCtorInitializer *Init = MemInits[i]; 3221 3222 // Set the source order index. 3223 Init->setSourceOrder(i); 3224 3225 if (Init->isAnyMemberInitializer()) { 3226 FieldDecl *Field = Init->getAnyMember(); 3227 if (CheckRedundantInit(*this, Init, Members[Field]) || 3228 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3229 HadError = true; 3230 } else if (Init->isBaseInitializer()) { 3231 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3232 if (CheckRedundantInit(*this, Init, Members[Key])) 3233 HadError = true; 3234 } else { 3235 assert(Init->isDelegatingInitializer()); 3236 // This must be the only initializer 3237 if (i != 0 || NumMemInits > 1) { 3238 Diag(MemInits[0]->getSourceLocation(), 3239 diag::err_delegating_initializer_alone) 3240 << MemInits[0]->getSourceRange(); 3241 HadError = true; 3242 // We will treat this as being the only initializer. 3243 } 3244 SetDelegatingInitializer(Constructor, MemInits[i]); 3245 // Return immediately as the initializer is set. 3246 return; 3247 } 3248 } 3249 3250 if (HadError) 3251 return; 3252 3253 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3254 3255 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3256} 3257 3258void 3259Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3260 CXXRecordDecl *ClassDecl) { 3261 // Ignore dependent contexts. Also ignore unions, since their members never 3262 // have destructors implicitly called. 3263 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3264 return; 3265 3266 // FIXME: all the access-control diagnostics are positioned on the 3267 // field/base declaration. That's probably good; that said, the 3268 // user might reasonably want to know why the destructor is being 3269 // emitted, and we currently don't say. 3270 3271 // Non-static data members. 3272 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3273 E = ClassDecl->field_end(); I != E; ++I) { 3274 FieldDecl *Field = *I; 3275 if (Field->isInvalidDecl()) 3276 continue; 3277 3278 // Don't destroy incomplete or zero-length arrays. 3279 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3280 continue; 3281 3282 QualType FieldType = Context.getBaseElementType(Field->getType()); 3283 3284 const RecordType* RT = FieldType->getAs<RecordType>(); 3285 if (!RT) 3286 continue; 3287 3288 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3289 if (FieldClassDecl->isInvalidDecl()) 3290 continue; 3291 if (FieldClassDecl->hasTrivialDestructor()) 3292 continue; 3293 3294 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3295 assert(Dtor && "No dtor found for FieldClassDecl!"); 3296 CheckDestructorAccess(Field->getLocation(), Dtor, 3297 PDiag(diag::err_access_dtor_field) 3298 << Field->getDeclName() 3299 << FieldType); 3300 3301 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3302 } 3303 3304 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3305 3306 // Bases. 3307 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3308 E = ClassDecl->bases_end(); Base != E; ++Base) { 3309 // Bases are always records in a well-formed non-dependent class. 3310 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3311 3312 // Remember direct virtual bases. 3313 if (Base->isVirtual()) 3314 DirectVirtualBases.insert(RT); 3315 3316 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3317 // If our base class is invalid, we probably can't get its dtor anyway. 3318 if (BaseClassDecl->isInvalidDecl()) 3319 continue; 3320 // Ignore trivial destructors. 3321 if (BaseClassDecl->hasTrivialDestructor()) 3322 continue; 3323 3324 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3325 assert(Dtor && "No dtor found for BaseClassDecl!"); 3326 3327 // FIXME: caret should be on the start of the class name 3328 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3329 PDiag(diag::err_access_dtor_base) 3330 << Base->getType() 3331 << Base->getSourceRange()); 3332 3333 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3334 } 3335 3336 // Virtual bases. 3337 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3338 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3339 3340 // Bases are always records in a well-formed non-dependent class. 3341 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3342 3343 // Ignore direct virtual bases. 3344 if (DirectVirtualBases.count(RT)) 3345 continue; 3346 3347 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3348 // If our base class is invalid, we probably can't get its dtor anyway. 3349 if (BaseClassDecl->isInvalidDecl()) 3350 continue; 3351 // Ignore trivial destructors. 3352 if (BaseClassDecl->hasTrivialDestructor()) 3353 continue; 3354 3355 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3356 assert(Dtor && "No dtor found for BaseClassDecl!"); 3357 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3358 PDiag(diag::err_access_dtor_vbase) 3359 << VBase->getType()); 3360 3361 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3362 } 3363} 3364 3365void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3366 if (!CDtorDecl) 3367 return; 3368 3369 if (CXXConstructorDecl *Constructor 3370 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3371 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3372} 3373 3374bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3375 unsigned DiagID, AbstractDiagSelID SelID) { 3376 if (SelID == -1) 3377 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3378 else 3379 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3380} 3381 3382bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3383 const PartialDiagnostic &PD) { 3384 if (!getLangOptions().CPlusPlus) 3385 return false; 3386 3387 if (const ArrayType *AT = Context.getAsArrayType(T)) 3388 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3389 3390 if (const PointerType *PT = T->getAs<PointerType>()) { 3391 // Find the innermost pointer type. 3392 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3393 PT = T; 3394 3395 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3396 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3397 } 3398 3399 const RecordType *RT = T->getAs<RecordType>(); 3400 if (!RT) 3401 return false; 3402 3403 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3404 3405 // We can't answer whether something is abstract until it has a 3406 // definition. If it's currently being defined, we'll walk back 3407 // over all the declarations when we have a full definition. 3408 const CXXRecordDecl *Def = RD->getDefinition(); 3409 if (!Def || Def->isBeingDefined()) 3410 return false; 3411 3412 if (!RD->isAbstract()) 3413 return false; 3414 3415 Diag(Loc, PD) << RD->getDeclName(); 3416 DiagnoseAbstractType(RD); 3417 3418 return true; 3419} 3420 3421void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3422 // Check if we've already emitted the list of pure virtual functions 3423 // for this class. 3424 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3425 return; 3426 3427 CXXFinalOverriderMap FinalOverriders; 3428 RD->getFinalOverriders(FinalOverriders); 3429 3430 // Keep a set of seen pure methods so we won't diagnose the same method 3431 // more than once. 3432 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3433 3434 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3435 MEnd = FinalOverriders.end(); 3436 M != MEnd; 3437 ++M) { 3438 for (OverridingMethods::iterator SO = M->second.begin(), 3439 SOEnd = M->second.end(); 3440 SO != SOEnd; ++SO) { 3441 // C++ [class.abstract]p4: 3442 // A class is abstract if it contains or inherits at least one 3443 // pure virtual function for which the final overrider is pure 3444 // virtual. 3445 3446 // 3447 if (SO->second.size() != 1) 3448 continue; 3449 3450 if (!SO->second.front().Method->isPure()) 3451 continue; 3452 3453 if (!SeenPureMethods.insert(SO->second.front().Method)) 3454 continue; 3455 3456 Diag(SO->second.front().Method->getLocation(), 3457 diag::note_pure_virtual_function) 3458 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3459 } 3460 } 3461 3462 if (!PureVirtualClassDiagSet) 3463 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3464 PureVirtualClassDiagSet->insert(RD); 3465} 3466 3467namespace { 3468struct AbstractUsageInfo { 3469 Sema &S; 3470 CXXRecordDecl *Record; 3471 CanQualType AbstractType; 3472 bool Invalid; 3473 3474 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3475 : S(S), Record(Record), 3476 AbstractType(S.Context.getCanonicalType( 3477 S.Context.getTypeDeclType(Record))), 3478 Invalid(false) {} 3479 3480 void DiagnoseAbstractType() { 3481 if (Invalid) return; 3482 S.DiagnoseAbstractType(Record); 3483 Invalid = true; 3484 } 3485 3486 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3487}; 3488 3489struct CheckAbstractUsage { 3490 AbstractUsageInfo &Info; 3491 const NamedDecl *Ctx; 3492 3493 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3494 : Info(Info), Ctx(Ctx) {} 3495 3496 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3497 switch (TL.getTypeLocClass()) { 3498#define ABSTRACT_TYPELOC(CLASS, PARENT) 3499#define TYPELOC(CLASS, PARENT) \ 3500 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3501#include "clang/AST/TypeLocNodes.def" 3502 } 3503 } 3504 3505 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3506 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3507 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3508 if (!TL.getArg(I)) 3509 continue; 3510 3511 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3512 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3513 } 3514 } 3515 3516 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3517 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3518 } 3519 3520 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3521 // Visit the type parameters from a permissive context. 3522 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3523 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3524 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3525 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3526 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3527 // TODO: other template argument types? 3528 } 3529 } 3530 3531 // Visit pointee types from a permissive context. 3532#define CheckPolymorphic(Type) \ 3533 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3534 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3535 } 3536 CheckPolymorphic(PointerTypeLoc) 3537 CheckPolymorphic(ReferenceTypeLoc) 3538 CheckPolymorphic(MemberPointerTypeLoc) 3539 CheckPolymorphic(BlockPointerTypeLoc) 3540 CheckPolymorphic(AtomicTypeLoc) 3541 3542 /// Handle all the types we haven't given a more specific 3543 /// implementation for above. 3544 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3545 // Every other kind of type that we haven't called out already 3546 // that has an inner type is either (1) sugar or (2) contains that 3547 // inner type in some way as a subobject. 3548 if (TypeLoc Next = TL.getNextTypeLoc()) 3549 return Visit(Next, Sel); 3550 3551 // If there's no inner type and we're in a permissive context, 3552 // don't diagnose. 3553 if (Sel == Sema::AbstractNone) return; 3554 3555 // Check whether the type matches the abstract type. 3556 QualType T = TL.getType(); 3557 if (T->isArrayType()) { 3558 Sel = Sema::AbstractArrayType; 3559 T = Info.S.Context.getBaseElementType(T); 3560 } 3561 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3562 if (CT != Info.AbstractType) return; 3563 3564 // It matched; do some magic. 3565 if (Sel == Sema::AbstractArrayType) { 3566 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3567 << T << TL.getSourceRange(); 3568 } else { 3569 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3570 << Sel << T << TL.getSourceRange(); 3571 } 3572 Info.DiagnoseAbstractType(); 3573 } 3574}; 3575 3576void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3577 Sema::AbstractDiagSelID Sel) { 3578 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3579} 3580 3581} 3582 3583/// Check for invalid uses of an abstract type in a method declaration. 3584static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3585 CXXMethodDecl *MD) { 3586 // No need to do the check on definitions, which require that 3587 // the return/param types be complete. 3588 if (MD->doesThisDeclarationHaveABody()) 3589 return; 3590 3591 // For safety's sake, just ignore it if we don't have type source 3592 // information. This should never happen for non-implicit methods, 3593 // but... 3594 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3595 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3596} 3597 3598/// Check for invalid uses of an abstract type within a class definition. 3599static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3600 CXXRecordDecl *RD) { 3601 for (CXXRecordDecl::decl_iterator 3602 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3603 Decl *D = *I; 3604 if (D->isImplicit()) continue; 3605 3606 // Methods and method templates. 3607 if (isa<CXXMethodDecl>(D)) { 3608 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3609 } else if (isa<FunctionTemplateDecl>(D)) { 3610 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3611 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3612 3613 // Fields and static variables. 3614 } else if (isa<FieldDecl>(D)) { 3615 FieldDecl *FD = cast<FieldDecl>(D); 3616 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3617 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3618 } else if (isa<VarDecl>(D)) { 3619 VarDecl *VD = cast<VarDecl>(D); 3620 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3621 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3622 3623 // Nested classes and class templates. 3624 } else if (isa<CXXRecordDecl>(D)) { 3625 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3626 } else if (isa<ClassTemplateDecl>(D)) { 3627 CheckAbstractClassUsage(Info, 3628 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3629 } 3630 } 3631} 3632 3633/// \brief Perform semantic checks on a class definition that has been 3634/// completing, introducing implicitly-declared members, checking for 3635/// abstract types, etc. 3636void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3637 if (!Record) 3638 return; 3639 3640 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3641 AbstractUsageInfo Info(*this, Record); 3642 CheckAbstractClassUsage(Info, Record); 3643 } 3644 3645 // If this is not an aggregate type and has no user-declared constructor, 3646 // complain about any non-static data members of reference or const scalar 3647 // type, since they will never get initializers. 3648 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3649 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3650 !Record->isLambda()) { 3651 bool Complained = false; 3652 for (RecordDecl::field_iterator F = Record->field_begin(), 3653 FEnd = Record->field_end(); 3654 F != FEnd; ++F) { 3655 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3656 continue; 3657 3658 if (F->getType()->isReferenceType() || 3659 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3660 if (!Complained) { 3661 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3662 << Record->getTagKind() << Record; 3663 Complained = true; 3664 } 3665 3666 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3667 << F->getType()->isReferenceType() 3668 << F->getDeclName(); 3669 } 3670 } 3671 } 3672 3673 if (Record->isDynamicClass() && !Record->isDependentType()) 3674 DynamicClasses.push_back(Record); 3675 3676 if (Record->getIdentifier()) { 3677 // C++ [class.mem]p13: 3678 // If T is the name of a class, then each of the following shall have a 3679 // name different from T: 3680 // - every member of every anonymous union that is a member of class T. 3681 // 3682 // C++ [class.mem]p14: 3683 // In addition, if class T has a user-declared constructor (12.1), every 3684 // non-static data member of class T shall have a name different from T. 3685 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3686 R.first != R.second; ++R.first) { 3687 NamedDecl *D = *R.first; 3688 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3689 isa<IndirectFieldDecl>(D)) { 3690 Diag(D->getLocation(), diag::err_member_name_of_class) 3691 << D->getDeclName(); 3692 break; 3693 } 3694 } 3695 } 3696 3697 // Warn if the class has virtual methods but non-virtual public destructor. 3698 if (Record->isPolymorphic() && !Record->isDependentType()) { 3699 CXXDestructorDecl *dtor = Record->getDestructor(); 3700 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3701 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3702 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3703 } 3704 3705 // See if a method overloads virtual methods in a base 3706 /// class without overriding any. 3707 if (!Record->isDependentType()) { 3708 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3709 MEnd = Record->method_end(); 3710 M != MEnd; ++M) { 3711 if (!(*M)->isStatic()) 3712 DiagnoseHiddenVirtualMethods(Record, *M); 3713 } 3714 } 3715 3716 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3717 // function that is not a constructor declares that member function to be 3718 // const. [...] The class of which that function is a member shall be 3719 // a literal type. 3720 // 3721 // If the class has virtual bases, any constexpr members will already have 3722 // been diagnosed by the checks performed on the member declaration, so 3723 // suppress this (less useful) diagnostic. 3724 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3725 !Record->isLiteral() && !Record->getNumVBases()) { 3726 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3727 MEnd = Record->method_end(); 3728 M != MEnd; ++M) { 3729 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3730 switch (Record->getTemplateSpecializationKind()) { 3731 case TSK_ImplicitInstantiation: 3732 case TSK_ExplicitInstantiationDeclaration: 3733 case TSK_ExplicitInstantiationDefinition: 3734 // If a template instantiates to a non-literal type, but its members 3735 // instantiate to constexpr functions, the template is technically 3736 // ill-formed, but we allow it for sanity. 3737 continue; 3738 3739 case TSK_Undeclared: 3740 case TSK_ExplicitSpecialization: 3741 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3742 PDiag(diag::err_constexpr_method_non_literal)); 3743 break; 3744 } 3745 3746 // Only produce one error per class. 3747 break; 3748 } 3749 } 3750 } 3751 3752 // Declare inherited constructors. We do this eagerly here because: 3753 // - The standard requires an eager diagnostic for conflicting inherited 3754 // constructors from different classes. 3755 // - The lazy declaration of the other implicit constructors is so as to not 3756 // waste space and performance on classes that are not meant to be 3757 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3758 // have inherited constructors. 3759 DeclareInheritedConstructors(Record); 3760 3761 if (!Record->isDependentType()) 3762 CheckExplicitlyDefaultedMethods(Record); 3763} 3764 3765void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3766 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3767 ME = Record->method_end(); 3768 MI != ME; ++MI) { 3769 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3770 switch (getSpecialMember(*MI)) { 3771 case CXXDefaultConstructor: 3772 CheckExplicitlyDefaultedDefaultConstructor( 3773 cast<CXXConstructorDecl>(*MI)); 3774 break; 3775 3776 case CXXDestructor: 3777 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3778 break; 3779 3780 case CXXCopyConstructor: 3781 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3782 break; 3783 3784 case CXXCopyAssignment: 3785 CheckExplicitlyDefaultedCopyAssignment(*MI); 3786 break; 3787 3788 case CXXMoveConstructor: 3789 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3790 break; 3791 3792 case CXXMoveAssignment: 3793 CheckExplicitlyDefaultedMoveAssignment(*MI); 3794 break; 3795 3796 case CXXInvalid: 3797 llvm_unreachable("non-special member explicitly defaulted!"); 3798 } 3799 } 3800 } 3801 3802} 3803 3804void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3805 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3806 3807 // Whether this was the first-declared instance of the constructor. 3808 // This affects whether we implicitly add an exception spec (and, eventually, 3809 // constexpr). It is also ill-formed to explicitly default a constructor such 3810 // that it would be deleted. (C++0x [decl.fct.def.default]) 3811 bool First = CD == CD->getCanonicalDecl(); 3812 3813 bool HadError = false; 3814 if (CD->getNumParams() != 0) { 3815 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3816 << CD->getSourceRange(); 3817 HadError = true; 3818 } 3819 3820 ImplicitExceptionSpecification Spec 3821 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3822 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3823 if (EPI.ExceptionSpecType == EST_Delayed) { 3824 // Exception specification depends on some deferred part of the class. We'll 3825 // try again when the class's definition has been fully processed. 3826 return; 3827 } 3828 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3829 *ExceptionType = Context.getFunctionType( 3830 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3831 3832 // C++11 [dcl.fct.def.default]p2: 3833 // An explicitly-defaulted function may be declared constexpr only if it 3834 // would have been implicitly declared as constexpr, 3835 // Do not apply this rule to templates, since core issue 1358 makes such 3836 // functions always instantiate to constexpr functions. 3837 if (CD->isConstexpr() && 3838 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3839 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3840 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3841 << CXXDefaultConstructor; 3842 HadError = true; 3843 } 3844 } 3845 // and may have an explicit exception-specification only if it is compatible 3846 // with the exception-specification on the implicit declaration. 3847 if (CtorType->hasExceptionSpec()) { 3848 if (CheckEquivalentExceptionSpec( 3849 PDiag(diag::err_incorrect_defaulted_exception_spec) 3850 << CXXDefaultConstructor, 3851 PDiag(), 3852 ExceptionType, SourceLocation(), 3853 CtorType, CD->getLocation())) { 3854 HadError = true; 3855 } 3856 } 3857 3858 // If a function is explicitly defaulted on its first declaration, 3859 if (First) { 3860 // -- it is implicitly considered to be constexpr if the implicit 3861 // definition would be, 3862 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3863 3864 // -- it is implicitly considered to have the same 3865 // exception-specification as if it had been implicitly declared 3866 // 3867 // FIXME: a compatible, but different, explicit exception specification 3868 // will be silently overridden. We should issue a warning if this happens. 3869 EPI.ExtInfo = CtorType->getExtInfo(); 3870 } 3871 3872 if (HadError) { 3873 CD->setInvalidDecl(); 3874 return; 3875 } 3876 3877 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3878 if (First) { 3879 CD->setDeletedAsWritten(); 3880 } else { 3881 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3882 << CXXDefaultConstructor; 3883 CD->setInvalidDecl(); 3884 } 3885 } 3886} 3887 3888void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3889 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3890 3891 // Whether this was the first-declared instance of the constructor. 3892 bool First = CD == CD->getCanonicalDecl(); 3893 3894 bool HadError = false; 3895 if (CD->getNumParams() != 1) { 3896 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3897 << CD->getSourceRange(); 3898 HadError = true; 3899 } 3900 3901 ImplicitExceptionSpecification Spec(Context); 3902 bool Const; 3903 llvm::tie(Spec, Const) = 3904 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3905 3906 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3907 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3908 *ExceptionType = Context.getFunctionType( 3909 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3910 3911 // Check for parameter type matching. 3912 // This is a copy ctor so we know it's a cv-qualified reference to T. 3913 QualType ArgType = CtorType->getArgType(0); 3914 if (ArgType->getPointeeType().isVolatileQualified()) { 3915 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3916 HadError = true; 3917 } 3918 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3919 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3920 HadError = true; 3921 } 3922 3923 // C++11 [dcl.fct.def.default]p2: 3924 // An explicitly-defaulted function may be declared constexpr only if it 3925 // would have been implicitly declared as constexpr, 3926 // Do not apply this rule to templates, since core issue 1358 makes such 3927 // functions always instantiate to constexpr functions. 3928 if (CD->isConstexpr() && 3929 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3930 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3931 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3932 << CXXCopyConstructor; 3933 HadError = true; 3934 } 3935 } 3936 // and may have an explicit exception-specification only if it is compatible 3937 // with the exception-specification on the implicit declaration. 3938 if (CtorType->hasExceptionSpec()) { 3939 if (CheckEquivalentExceptionSpec( 3940 PDiag(diag::err_incorrect_defaulted_exception_spec) 3941 << CXXCopyConstructor, 3942 PDiag(), 3943 ExceptionType, SourceLocation(), 3944 CtorType, CD->getLocation())) { 3945 HadError = true; 3946 } 3947 } 3948 3949 // If a function is explicitly defaulted on its first declaration, 3950 if (First) { 3951 // -- it is implicitly considered to be constexpr if the implicit 3952 // definition would be, 3953 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3954 3955 // -- it is implicitly considered to have the same 3956 // exception-specification as if it had been implicitly declared, and 3957 // 3958 // FIXME: a compatible, but different, explicit exception specification 3959 // will be silently overridden. We should issue a warning if this happens. 3960 EPI.ExtInfo = CtorType->getExtInfo(); 3961 3962 // -- [...] it shall have the same parameter type as if it had been 3963 // implicitly declared. 3964 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3965 } 3966 3967 if (HadError) { 3968 CD->setInvalidDecl(); 3969 return; 3970 } 3971 3972 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3973 if (First) { 3974 CD->setDeletedAsWritten(); 3975 } else { 3976 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3977 << CXXCopyConstructor; 3978 CD->setInvalidDecl(); 3979 } 3980 } 3981} 3982 3983void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3984 assert(MD->isExplicitlyDefaulted()); 3985 3986 // Whether this was the first-declared instance of the operator 3987 bool First = MD == MD->getCanonicalDecl(); 3988 3989 bool HadError = false; 3990 if (MD->getNumParams() != 1) { 3991 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3992 << MD->getSourceRange(); 3993 HadError = true; 3994 } 3995 3996 QualType ReturnType = 3997 MD->getType()->getAs<FunctionType>()->getResultType(); 3998 if (!ReturnType->isLValueReferenceType() || 3999 !Context.hasSameType( 4000 Context.getCanonicalType(ReturnType->getPointeeType()), 4001 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4002 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 4003 HadError = true; 4004 } 4005 4006 ImplicitExceptionSpecification Spec(Context); 4007 bool Const; 4008 llvm::tie(Spec, Const) = 4009 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4010 4011 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4012 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4013 *ExceptionType = Context.getFunctionType( 4014 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4015 4016 QualType ArgType = OperType->getArgType(0); 4017 if (!ArgType->isLValueReferenceType()) { 4018 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4019 HadError = true; 4020 } else { 4021 if (ArgType->getPointeeType().isVolatileQualified()) { 4022 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4023 HadError = true; 4024 } 4025 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4026 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4027 HadError = true; 4028 } 4029 } 4030 4031 if (OperType->getTypeQuals()) { 4032 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4033 HadError = true; 4034 } 4035 4036 if (OperType->hasExceptionSpec()) { 4037 if (CheckEquivalentExceptionSpec( 4038 PDiag(diag::err_incorrect_defaulted_exception_spec) 4039 << CXXCopyAssignment, 4040 PDiag(), 4041 ExceptionType, SourceLocation(), 4042 OperType, MD->getLocation())) { 4043 HadError = true; 4044 } 4045 } 4046 if (First) { 4047 // We set the declaration to have the computed exception spec here. 4048 // We duplicate the one parameter type. 4049 EPI.RefQualifier = OperType->getRefQualifier(); 4050 EPI.ExtInfo = OperType->getExtInfo(); 4051 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4052 } 4053 4054 if (HadError) { 4055 MD->setInvalidDecl(); 4056 return; 4057 } 4058 4059 if (ShouldDeleteCopyAssignmentOperator(MD)) { 4060 if (First) { 4061 MD->setDeletedAsWritten(); 4062 } else { 4063 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4064 << CXXCopyAssignment; 4065 MD->setInvalidDecl(); 4066 } 4067 } 4068} 4069 4070void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4071 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4072 4073 // Whether this was the first-declared instance of the constructor. 4074 bool First = CD == CD->getCanonicalDecl(); 4075 4076 bool HadError = false; 4077 if (CD->getNumParams() != 1) { 4078 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4079 << CD->getSourceRange(); 4080 HadError = true; 4081 } 4082 4083 ImplicitExceptionSpecification Spec( 4084 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4085 4086 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4087 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4088 *ExceptionType = Context.getFunctionType( 4089 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4090 4091 // Check for parameter type matching. 4092 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4093 QualType ArgType = CtorType->getArgType(0); 4094 if (ArgType->getPointeeType().isVolatileQualified()) { 4095 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4096 HadError = true; 4097 } 4098 if (ArgType->getPointeeType().isConstQualified()) { 4099 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4100 HadError = true; 4101 } 4102 4103 // C++11 [dcl.fct.def.default]p2: 4104 // An explicitly-defaulted function may be declared constexpr only if it 4105 // would have been implicitly declared as constexpr, 4106 // Do not apply this rule to templates, since core issue 1358 makes such 4107 // functions always instantiate to constexpr functions. 4108 if (CD->isConstexpr() && 4109 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4110 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4111 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4112 << CXXMoveConstructor; 4113 HadError = true; 4114 } 4115 } 4116 // and may have an explicit exception-specification only if it is compatible 4117 // with the exception-specification on the implicit declaration. 4118 if (CtorType->hasExceptionSpec()) { 4119 if (CheckEquivalentExceptionSpec( 4120 PDiag(diag::err_incorrect_defaulted_exception_spec) 4121 << CXXMoveConstructor, 4122 PDiag(), 4123 ExceptionType, SourceLocation(), 4124 CtorType, CD->getLocation())) { 4125 HadError = true; 4126 } 4127 } 4128 4129 // If a function is explicitly defaulted on its first declaration, 4130 if (First) { 4131 // -- it is implicitly considered to be constexpr if the implicit 4132 // definition would be, 4133 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4134 4135 // -- it is implicitly considered to have the same 4136 // exception-specification as if it had been implicitly declared, and 4137 // 4138 // FIXME: a compatible, but different, explicit exception specification 4139 // will be silently overridden. We should issue a warning if this happens. 4140 EPI.ExtInfo = CtorType->getExtInfo(); 4141 4142 // -- [...] it shall have the same parameter type as if it had been 4143 // implicitly declared. 4144 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4145 } 4146 4147 if (HadError) { 4148 CD->setInvalidDecl(); 4149 return; 4150 } 4151 4152 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4153 if (First) { 4154 CD->setDeletedAsWritten(); 4155 } else { 4156 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4157 << CXXMoveConstructor; 4158 CD->setInvalidDecl(); 4159 } 4160 } 4161} 4162 4163void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4164 assert(MD->isExplicitlyDefaulted()); 4165 4166 // Whether this was the first-declared instance of the operator 4167 bool First = MD == MD->getCanonicalDecl(); 4168 4169 bool HadError = false; 4170 if (MD->getNumParams() != 1) { 4171 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4172 << MD->getSourceRange(); 4173 HadError = true; 4174 } 4175 4176 QualType ReturnType = 4177 MD->getType()->getAs<FunctionType>()->getResultType(); 4178 if (!ReturnType->isLValueReferenceType() || 4179 !Context.hasSameType( 4180 Context.getCanonicalType(ReturnType->getPointeeType()), 4181 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4182 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4183 HadError = true; 4184 } 4185 4186 ImplicitExceptionSpecification Spec( 4187 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4188 4189 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4190 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4191 *ExceptionType = Context.getFunctionType( 4192 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4193 4194 QualType ArgType = OperType->getArgType(0); 4195 if (!ArgType->isRValueReferenceType()) { 4196 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4197 HadError = true; 4198 } else { 4199 if (ArgType->getPointeeType().isVolatileQualified()) { 4200 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4201 HadError = true; 4202 } 4203 if (ArgType->getPointeeType().isConstQualified()) { 4204 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4205 HadError = true; 4206 } 4207 } 4208 4209 if (OperType->getTypeQuals()) { 4210 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4211 HadError = true; 4212 } 4213 4214 if (OperType->hasExceptionSpec()) { 4215 if (CheckEquivalentExceptionSpec( 4216 PDiag(diag::err_incorrect_defaulted_exception_spec) 4217 << CXXMoveAssignment, 4218 PDiag(), 4219 ExceptionType, SourceLocation(), 4220 OperType, MD->getLocation())) { 4221 HadError = true; 4222 } 4223 } 4224 if (First) { 4225 // We set the declaration to have the computed exception spec here. 4226 // We duplicate the one parameter type. 4227 EPI.RefQualifier = OperType->getRefQualifier(); 4228 EPI.ExtInfo = OperType->getExtInfo(); 4229 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4230 } 4231 4232 if (HadError) { 4233 MD->setInvalidDecl(); 4234 return; 4235 } 4236 4237 if (ShouldDeleteMoveAssignmentOperator(MD)) { 4238 if (First) { 4239 MD->setDeletedAsWritten(); 4240 } else { 4241 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4242 << CXXMoveAssignment; 4243 MD->setInvalidDecl(); 4244 } 4245 } 4246} 4247 4248void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4249 assert(DD->isExplicitlyDefaulted()); 4250 4251 // Whether this was the first-declared instance of the destructor. 4252 bool First = DD == DD->getCanonicalDecl(); 4253 4254 ImplicitExceptionSpecification Spec 4255 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4256 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4257 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4258 *ExceptionType = Context.getFunctionType( 4259 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4260 4261 if (DtorType->hasExceptionSpec()) { 4262 if (CheckEquivalentExceptionSpec( 4263 PDiag(diag::err_incorrect_defaulted_exception_spec) 4264 << CXXDestructor, 4265 PDiag(), 4266 ExceptionType, SourceLocation(), 4267 DtorType, DD->getLocation())) { 4268 DD->setInvalidDecl(); 4269 return; 4270 } 4271 } 4272 if (First) { 4273 // We set the declaration to have the computed exception spec here. 4274 // There are no parameters. 4275 EPI.ExtInfo = DtorType->getExtInfo(); 4276 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4277 } 4278 4279 if (ShouldDeleteDestructor(DD)) { 4280 if (First) { 4281 DD->setDeletedAsWritten(); 4282 } else { 4283 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4284 << CXXDestructor; 4285 DD->setInvalidDecl(); 4286 } 4287 } 4288} 4289 4290/// This function implements the following C++0x paragraphs: 4291/// - [class.ctor]/5 4292/// - [class.copy]/11 4293bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4294 assert(!MD->isInvalidDecl()); 4295 CXXRecordDecl *RD = MD->getParent(); 4296 assert(!RD->isDependentType() && "do deletion after instantiation"); 4297 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4298 return false; 4299 4300 bool IsUnion = RD->isUnion(); 4301 bool IsConstructor = false; 4302 bool IsAssignment = false; 4303 bool IsMove = false; 4304 4305 bool ConstArg = false; 4306 4307 switch (CSM) { 4308 case CXXDefaultConstructor: 4309 IsConstructor = true; 4310 4311 // C++11 [expr.lambda.prim]p19: 4312 // The closure type associated with a lambda-expression has a 4313 // deleted (8.4.3) default constructor. 4314 if (RD->isLambda()) 4315 return true; 4316 4317 break; 4318 case CXXCopyConstructor: 4319 IsConstructor = true; 4320 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4321 break; 4322 case CXXMoveConstructor: 4323 IsConstructor = true; 4324 IsMove = true; 4325 break; 4326 default: 4327 llvm_unreachable("function only currently implemented for default ctors"); 4328 } 4329 4330 SourceLocation Loc = MD->getLocation(); 4331 4332 // Do access control from the special member function 4333 ContextRAII MethodContext(*this, MD); 4334 4335 bool AllConst = true; 4336 4337 // We do this because we should never actually use an anonymous 4338 // union's constructor. 4339 if (IsUnion && RD->isAnonymousStructOrUnion()) 4340 return false; 4341 4342 // FIXME: We should put some diagnostic logic right into this function. 4343 4344 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4345 BE = RD->bases_end(); 4346 BI != BE; ++BI) { 4347 // We'll handle this one later 4348 if (BI->isVirtual()) 4349 continue; 4350 4351 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4352 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4353 4354 // Unless we have an assignment operator, the base's destructor must 4355 // be accessible and not deleted. 4356 if (!IsAssignment) { 4357 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4358 if (BaseDtor->isDeleted()) 4359 return true; 4360 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4361 AR_accessible) 4362 return true; 4363 } 4364 4365 // Finding the corresponding member in the base should lead to a 4366 // unique, accessible, non-deleted function. If we are doing 4367 // a destructor, we have already checked this case. 4368 if (CSM != CXXDestructor) { 4369 SpecialMemberOverloadResult *SMOR = 4370 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4371 false); 4372 if (!SMOR->hasSuccess()) 4373 return true; 4374 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4375 if (IsConstructor) { 4376 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4377 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4378 PDiag()) != AR_accessible) 4379 return true; 4380 4381 // For a move operation, the corresponding operation must actually 4382 // be a move operation (and not a copy selected by overload 4383 // resolution) unless we are working on a trivially copyable class. 4384 if (IsMove && !BaseCtor->isMoveConstructor() && 4385 !BaseDecl->isTriviallyCopyable()) 4386 return true; 4387 } 4388 } 4389 } 4390 4391 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4392 BE = RD->vbases_end(); 4393 BI != BE; ++BI) { 4394 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4395 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4396 4397 // Unless we have an assignment operator, the base's destructor must 4398 // be accessible and not deleted. 4399 if (!IsAssignment) { 4400 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4401 if (BaseDtor->isDeleted()) 4402 return true; 4403 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4404 AR_accessible) 4405 return true; 4406 } 4407 4408 // Finding the corresponding member in the base should lead to a 4409 // unique, accessible, non-deleted function. 4410 if (CSM != CXXDestructor) { 4411 SpecialMemberOverloadResult *SMOR = 4412 LookupSpecialMember(BaseDecl, CSM, ConstArg, false, false, false, 4413 false); 4414 if (!SMOR->hasSuccess()) 4415 return true; 4416 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4417 if (IsConstructor) { 4418 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4419 if (CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4420 PDiag()) != AR_accessible) 4421 return true; 4422 4423 // For a move operation, the corresponding operation must actually 4424 // be a move operation (and not a copy selected by overload 4425 // resolution) unless we are working on a trivially copyable class. 4426 if (IsMove && !BaseCtor->isMoveConstructor() && 4427 !BaseDecl->isTriviallyCopyable()) 4428 return true; 4429 } 4430 } 4431 } 4432 4433 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4434 FE = RD->field_end(); 4435 FI != FE; ++FI) { 4436 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 4437 continue; 4438 4439 QualType FieldType = Context.getBaseElementType(FI->getType()); 4440 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4441 4442 // For a default constructor, all references must be initialized in-class 4443 // and, if a union, it must have a non-const member. 4444 if (CSM == CXXDefaultConstructor) { 4445 if (FieldType->isReferenceType() && !FI->hasInClassInitializer()) 4446 return true; 4447 4448 if (IsUnion && !FieldType.isConstQualified()) 4449 AllConst = false; 4450 // For a copy constructor, data members must not be of rvalue reference 4451 // type. 4452 } else if (CSM == CXXCopyConstructor) { 4453 if (FieldType->isRValueReferenceType()) 4454 return true; 4455 } 4456 4457 if (FieldRecord) { 4458 // For a default constructor, a const member must have a user-provided 4459 // default constructor or else be explicitly initialized. 4460 if (CSM == CXXDefaultConstructor && FieldType.isConstQualified() && 4461 !FI->hasInClassInitializer() && 4462 !FieldRecord->hasUserProvidedDefaultConstructor()) 4463 return true; 4464 4465 // Some additional restrictions exist on the variant members. 4466 if (!IsUnion && FieldRecord->isUnion() && 4467 FieldRecord->isAnonymousStructOrUnion()) { 4468 // We're okay to reuse AllConst here since we only care about the 4469 // value otherwise if we're in a union. 4470 AllConst = true; 4471 4472 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4473 UE = FieldRecord->field_end(); 4474 UI != UE; ++UI) { 4475 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4476 CXXRecordDecl *UnionFieldRecord = 4477 UnionFieldType->getAsCXXRecordDecl(); 4478 4479 if (!UnionFieldType.isConstQualified()) 4480 AllConst = false; 4481 4482 if (UnionFieldRecord) { 4483 // FIXME: Checking for accessibility and validity of this 4484 // destructor is technically going beyond the 4485 // standard, but this is believed to be a defect. 4486 if (!IsAssignment) { 4487 CXXDestructorDecl *FieldDtor = LookupDestructor(UnionFieldRecord); 4488 if (FieldDtor->isDeleted()) 4489 return true; 4490 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4491 AR_accessible) 4492 return true; 4493 if (!FieldDtor->isTrivial()) 4494 return true; 4495 } 4496 4497 if (CSM != CXXDestructor) { 4498 SpecialMemberOverloadResult *SMOR = 4499 LookupSpecialMember(UnionFieldRecord, CSM, ConstArg, false, 4500 false, false, false); 4501 // FIXME: Checking for accessibility and validity of this 4502 // corresponding member is technically going beyond the 4503 // standard, but this is believed to be a defect. 4504 if (!SMOR->hasSuccess()) 4505 return true; 4506 4507 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4508 // A member of a union must have a trivial corresponding 4509 // constructor. 4510 if (!FieldMember->isTrivial()) 4511 return true; 4512 4513 if (IsConstructor) { 4514 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4515 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4516 PDiag()) != AR_accessible) 4517 return true; 4518 } 4519 } 4520 } 4521 } 4522 4523 // At least one member in each anonymous union must be non-const 4524 if (CSM == CXXDefaultConstructor && AllConst) 4525 return true; 4526 4527 // Don't try to initialize the anonymous union 4528 // This is technically non-conformant, but sanity demands it. 4529 continue; 4530 } 4531 4532 // Unless we're doing assignment, the field's destructor must be 4533 // accessible and not deleted. 4534 if (!IsAssignment) { 4535 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4536 if (FieldDtor->isDeleted()) 4537 return true; 4538 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4539 AR_accessible) 4540 return true; 4541 } 4542 4543 // Check that the corresponding member of the field is accessible, 4544 // unique, and non-deleted. We don't do this if it has an explicit 4545 // initialization when default-constructing. 4546 if (CSM != CXXDestructor && 4547 (CSM != CXXDefaultConstructor || !FI->hasInClassInitializer())) { 4548 SpecialMemberOverloadResult *SMOR = 4549 LookupSpecialMember(FieldRecord, CSM, ConstArg, false, false, false, 4550 false); 4551 if (!SMOR->hasSuccess()) 4552 return true; 4553 4554 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4555 if (IsConstructor) { 4556 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4557 if (CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4558 PDiag()) != AR_accessible) 4559 return true; 4560 4561 // For a move operation, the corresponding operation must actually 4562 // be a move operation (and not a copy selected by overload 4563 // resolution) unless we are working on a trivially copyable class. 4564 if (IsMove && !FieldCtor->isMoveConstructor() && 4565 !FieldRecord->isTriviallyCopyable()) 4566 return true; 4567 } 4568 4569 // We need the corresponding member of a union to be trivial so that 4570 // we can safely copy them all simultaneously. 4571 // FIXME: Note that performing the check here (where we rely on the lack 4572 // of an in-class initializer) is technically ill-formed. However, this 4573 // seems most obviously to be a bug in the standard. 4574 if (IsUnion && !FieldMember->isTrivial()) 4575 return true; 4576 } 4577 } else if (CSM == CXXDefaultConstructor && !IsUnion && 4578 FieldType.isConstQualified() && !FI->hasInClassInitializer()) { 4579 // We can't initialize a const member of non-class type to any value. 4580 return true; 4581 } 4582 } 4583 4584 // We can't have all const members in a union when default-constructing, 4585 // or else they're all nonsensical garbage values that can't be changed. 4586 if (CSM == CXXDefaultConstructor && IsUnion && AllConst) 4587 return true; 4588 4589 return false; 4590} 4591 4592bool Sema::ShouldDeleteCopyAssignmentOperator(CXXMethodDecl *MD) { 4593 CXXRecordDecl *RD = MD->getParent(); 4594 assert(!RD->isDependentType() && "do deletion after instantiation"); 4595 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4596 return false; 4597 4598 // C++11 [expr.lambda.prim]p19: 4599 // The closure type associated with a lambda-expression has a 4600 // [...] deleted copy assignment operator. 4601 if (RD->isLambda()) 4602 return true; 4603 4604 SourceLocation Loc = MD->getLocation(); 4605 4606 // Do access control from the constructor 4607 ContextRAII MethodContext(*this, MD); 4608 4609 bool Union = RD->isUnion(); 4610 4611 unsigned ArgQuals = 4612 MD->getParamDecl(0)->getType()->getPointeeType().isConstQualified() ? 4613 Qualifiers::Const : 0; 4614 4615 // We do this because we should never actually use an anonymous 4616 // union's constructor. 4617 if (Union && RD->isAnonymousStructOrUnion()) 4618 return false; 4619 4620 // FIXME: We should put some diagnostic logic right into this function. 4621 4622 // C++0x [class.copy]/20 4623 // A defaulted [copy] assignment operator for class X is defined as deleted 4624 // if X has: 4625 4626 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4627 BE = RD->bases_end(); 4628 BI != BE; ++BI) { 4629 // We'll handle this one later 4630 if (BI->isVirtual()) 4631 continue; 4632 4633 QualType BaseType = BI->getType(); 4634 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4635 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4636 4637 // -- a [direct base class] B that cannot be [copied] because overload 4638 // resolution, as applied to B's [copy] assignment operator, results in 4639 // an ambiguity or a function that is deleted or inaccessible from the 4640 // assignment operator 4641 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4642 0); 4643 if (!CopyOper || CopyOper->isDeleted()) 4644 return true; 4645 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4646 return true; 4647 } 4648 4649 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4650 BE = RD->vbases_end(); 4651 BI != BE; ++BI) { 4652 QualType BaseType = BI->getType(); 4653 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4654 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4655 4656 // -- a [virtual base class] B that cannot be [copied] because overload 4657 // resolution, as applied to B's [copy] assignment operator, results in 4658 // an ambiguity or a function that is deleted or inaccessible from the 4659 // assignment operator 4660 CXXMethodDecl *CopyOper = LookupCopyingAssignment(BaseDecl, ArgQuals, false, 4661 0); 4662 if (!CopyOper || CopyOper->isDeleted()) 4663 return true; 4664 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4665 return true; 4666 } 4667 4668 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4669 FE = RD->field_end(); 4670 FI != FE; ++FI) { 4671 if (FI->isUnnamedBitfield()) 4672 continue; 4673 4674 QualType FieldType = Context.getBaseElementType(FI->getType()); 4675 4676 // -- a non-static data member of reference type 4677 if (FieldType->isReferenceType()) 4678 return true; 4679 4680 // -- a non-static data member of const non-class type (or array thereof) 4681 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4682 return true; 4683 4684 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4685 4686 if (FieldRecord) { 4687 // This is an anonymous union 4688 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4689 // Anonymous unions inside unions do not variant members create 4690 if (!Union) { 4691 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4692 UE = FieldRecord->field_end(); 4693 UI != UE; ++UI) { 4694 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4695 CXXRecordDecl *UnionFieldRecord = 4696 UnionFieldType->getAsCXXRecordDecl(); 4697 4698 // -- a variant member with a non-trivial [copy] assignment operator 4699 // and X is a union-like class 4700 if (UnionFieldRecord && 4701 !UnionFieldRecord->hasTrivialCopyAssignment()) 4702 return true; 4703 } 4704 } 4705 4706 // Don't try to initalize an anonymous union 4707 continue; 4708 // -- a variant member with a non-trivial [copy] assignment operator 4709 // and X is a union-like class 4710 } else if (Union && !FieldRecord->hasTrivialCopyAssignment()) { 4711 return true; 4712 } 4713 4714 CXXMethodDecl *CopyOper = LookupCopyingAssignment(FieldRecord, ArgQuals, 4715 false, 0); 4716 if (!CopyOper || CopyOper->isDeleted()) 4717 return true; 4718 if (CheckDirectMemberAccess(Loc, CopyOper, PDiag()) != AR_accessible) 4719 return true; 4720 } 4721 } 4722 4723 return false; 4724} 4725 4726bool Sema::ShouldDeleteMoveAssignmentOperator(CXXMethodDecl *MD) { 4727 CXXRecordDecl *RD = MD->getParent(); 4728 assert(!RD->isDependentType() && "do deletion after instantiation"); 4729 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4730 return false; 4731 4732 SourceLocation Loc = MD->getLocation(); 4733 4734 // Do access control from the constructor 4735 ContextRAII MethodContext(*this, MD); 4736 4737 bool Union = RD->isUnion(); 4738 4739 // We do this because we should never actually use an anonymous 4740 // union's constructor. 4741 if (Union && RD->isAnonymousStructOrUnion()) 4742 return false; 4743 4744 // C++0x [class.copy]/20 4745 // A defaulted [move] assignment operator for class X is defined as deleted 4746 // if X has: 4747 4748 // -- for the move constructor, [...] any direct or indirect virtual base 4749 // class. 4750 if (RD->getNumVBases() != 0) 4751 return true; 4752 4753 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4754 BE = RD->bases_end(); 4755 BI != BE; ++BI) { 4756 4757 QualType BaseType = BI->getType(); 4758 CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl(); 4759 assert(BaseDecl && "base isn't a CXXRecordDecl"); 4760 4761 // -- a [direct base class] B that cannot be [moved] because overload 4762 // resolution, as applied to B's [move] assignment operator, results in 4763 // an ambiguity or a function that is deleted or inaccessible from the 4764 // assignment operator 4765 CXXMethodDecl *MoveOper = LookupMovingAssignment(BaseDecl, false, 0); 4766 if (!MoveOper || MoveOper->isDeleted()) 4767 return true; 4768 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4769 return true; 4770 4771 // -- for the move assignment operator, a [direct base class] with a type 4772 // that does not have a move assignment operator and is not trivially 4773 // copyable. 4774 if (!MoveOper->isMoveAssignmentOperator() && 4775 !BaseDecl->isTriviallyCopyable()) 4776 return true; 4777 } 4778 4779 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4780 FE = RD->field_end(); 4781 FI != FE; ++FI) { 4782 if (FI->isUnnamedBitfield()) 4783 continue; 4784 4785 QualType FieldType = Context.getBaseElementType(FI->getType()); 4786 4787 // -- a non-static data member of reference type 4788 if (FieldType->isReferenceType()) 4789 return true; 4790 4791 // -- a non-static data member of const non-class type (or array thereof) 4792 if (FieldType.isConstQualified() && !FieldType->isRecordType()) 4793 return true; 4794 4795 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4796 4797 if (FieldRecord) { 4798 // This is an anonymous union 4799 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4800 // Anonymous unions inside unions do not variant members create 4801 if (!Union) { 4802 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4803 UE = FieldRecord->field_end(); 4804 UI != UE; ++UI) { 4805 QualType UnionFieldType = Context.getBaseElementType(UI->getType()); 4806 CXXRecordDecl *UnionFieldRecord = 4807 UnionFieldType->getAsCXXRecordDecl(); 4808 4809 // -- a variant member with a non-trivial [move] assignment operator 4810 // and X is a union-like class 4811 if (UnionFieldRecord && 4812 !UnionFieldRecord->hasTrivialMoveAssignment()) 4813 return true; 4814 } 4815 } 4816 4817 // Don't try to initalize an anonymous union 4818 continue; 4819 // -- a variant member with a non-trivial [move] assignment operator 4820 // and X is a union-like class 4821 } else if (Union && !FieldRecord->hasTrivialMoveAssignment()) { 4822 return true; 4823 } 4824 4825 CXXMethodDecl *MoveOper = LookupMovingAssignment(FieldRecord, false, 0); 4826 if (!MoveOper || MoveOper->isDeleted()) 4827 return true; 4828 if (CheckDirectMemberAccess(Loc, MoveOper, PDiag()) != AR_accessible) 4829 return true; 4830 4831 // -- for the move assignment operator, a [non-static data member] with a 4832 // type that does not have a move assignment operator and is not 4833 // trivially copyable. 4834 if (!MoveOper->isMoveAssignmentOperator() && 4835 !FieldRecord->isTriviallyCopyable()) 4836 return true; 4837 } 4838 } 4839 4840 return false; 4841} 4842 4843bool Sema::ShouldDeleteDestructor(CXXDestructorDecl *DD) { 4844 CXXRecordDecl *RD = DD->getParent(); 4845 assert(!RD->isDependentType() && "do deletion after instantiation"); 4846 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4847 return false; 4848 4849 SourceLocation Loc = DD->getLocation(); 4850 4851 // Do access control from the destructor 4852 ContextRAII CtorContext(*this, DD); 4853 4854 bool Union = RD->isUnion(); 4855 4856 // We do this because we should never actually use an anonymous 4857 // union's destructor. 4858 if (Union && RD->isAnonymousStructOrUnion()) 4859 return false; 4860 4861 // C++0x [class.dtor]p5 4862 // A defaulted destructor for a class X is defined as deleted if: 4863 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4864 BE = RD->bases_end(); 4865 BI != BE; ++BI) { 4866 // We'll handle this one later 4867 if (BI->isVirtual()) 4868 continue; 4869 4870 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4871 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4872 assert(BaseDtor && "base has no destructor"); 4873 4874 // -- any direct or virtual base class has a deleted destructor or 4875 // a destructor that is inaccessible from the defaulted destructor 4876 if (BaseDtor->isDeleted()) 4877 return true; 4878 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4879 AR_accessible) 4880 return true; 4881 } 4882 4883 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4884 BE = RD->vbases_end(); 4885 BI != BE; ++BI) { 4886 CXXRecordDecl *BaseDecl = BI->getType()->getAsCXXRecordDecl(); 4887 CXXDestructorDecl *BaseDtor = LookupDestructor(BaseDecl); 4888 assert(BaseDtor && "base has no destructor"); 4889 4890 // -- any direct or virtual base class has a deleted destructor or 4891 // a destructor that is inaccessible from the defaulted destructor 4892 if (BaseDtor->isDeleted()) 4893 return true; 4894 if (CheckDestructorAccess(Loc, BaseDtor, PDiag()) != 4895 AR_accessible) 4896 return true; 4897 } 4898 4899 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4900 FE = RD->field_end(); 4901 FI != FE; ++FI) { 4902 QualType FieldType = Context.getBaseElementType(FI->getType()); 4903 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4904 if (FieldRecord) { 4905 if (FieldRecord->isUnion() && FieldRecord->isAnonymousStructOrUnion()) { 4906 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4907 UE = FieldRecord->field_end(); 4908 UI != UE; ++UI) { 4909 QualType UnionFieldType = Context.getBaseElementType(FI->getType()); 4910 CXXRecordDecl *UnionFieldRecord = 4911 UnionFieldType->getAsCXXRecordDecl(); 4912 4913 // -- X is a union-like class that has a variant member with a non- 4914 // trivial destructor. 4915 if (UnionFieldRecord && !UnionFieldRecord->hasTrivialDestructor()) 4916 return true; 4917 } 4918 // Technically we are supposed to do this next check unconditionally. 4919 // But that makes absolutely no sense. 4920 } else { 4921 CXXDestructorDecl *FieldDtor = LookupDestructor(FieldRecord); 4922 4923 // -- any of the non-static data members has class type M (or array 4924 // thereof) and M has a deleted destructor or a destructor that is 4925 // inaccessible from the defaulted destructor 4926 if (FieldDtor->isDeleted()) 4927 return true; 4928 if (CheckDestructorAccess(Loc, FieldDtor, PDiag()) != 4929 AR_accessible) 4930 return true; 4931 4932 // -- X is a union-like class that has a variant member with a non- 4933 // trivial destructor. 4934 if (Union && !FieldDtor->isTrivial()) 4935 return true; 4936 } 4937 } 4938 } 4939 4940 if (DD->isVirtual()) { 4941 FunctionDecl *OperatorDelete = 0; 4942 DeclarationName Name = 4943 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4944 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete, 4945 false)) 4946 return true; 4947 } 4948 4949 4950 return false; 4951} 4952 4953/// \brief Data used with FindHiddenVirtualMethod 4954namespace { 4955 struct FindHiddenVirtualMethodData { 4956 Sema *S; 4957 CXXMethodDecl *Method; 4958 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4959 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4960 }; 4961} 4962 4963/// \brief Member lookup function that determines whether a given C++ 4964/// method overloads virtual methods in a base class without overriding any, 4965/// to be used with CXXRecordDecl::lookupInBases(). 4966static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4967 CXXBasePath &Path, 4968 void *UserData) { 4969 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4970 4971 FindHiddenVirtualMethodData &Data 4972 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4973 4974 DeclarationName Name = Data.Method->getDeclName(); 4975 assert(Name.getNameKind() == DeclarationName::Identifier); 4976 4977 bool foundSameNameMethod = false; 4978 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4979 for (Path.Decls = BaseRecord->lookup(Name); 4980 Path.Decls.first != Path.Decls.second; 4981 ++Path.Decls.first) { 4982 NamedDecl *D = *Path.Decls.first; 4983 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4984 MD = MD->getCanonicalDecl(); 4985 foundSameNameMethod = true; 4986 // Interested only in hidden virtual methods. 4987 if (!MD->isVirtual()) 4988 continue; 4989 // If the method we are checking overrides a method from its base 4990 // don't warn about the other overloaded methods. 4991 if (!Data.S->IsOverload(Data.Method, MD, false)) 4992 return true; 4993 // Collect the overload only if its hidden. 4994 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4995 overloadedMethods.push_back(MD); 4996 } 4997 } 4998 4999 if (foundSameNameMethod) 5000 Data.OverloadedMethods.append(overloadedMethods.begin(), 5001 overloadedMethods.end()); 5002 return foundSameNameMethod; 5003} 5004 5005/// \brief See if a method overloads virtual methods in a base class without 5006/// overriding any. 5007void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5008 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5009 MD->getLocation()) == DiagnosticsEngine::Ignored) 5010 return; 5011 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 5012 return; 5013 5014 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5015 /*bool RecordPaths=*/false, 5016 /*bool DetectVirtual=*/false); 5017 FindHiddenVirtualMethodData Data; 5018 Data.Method = MD; 5019 Data.S = this; 5020 5021 // Keep the base methods that were overriden or introduced in the subclass 5022 // by 'using' in a set. A base method not in this set is hidden. 5023 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 5024 res.first != res.second; ++res.first) { 5025 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 5026 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5027 E = MD->end_overridden_methods(); 5028 I != E; ++I) 5029 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 5030 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 5031 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 5032 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 5033 } 5034 5035 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5036 !Data.OverloadedMethods.empty()) { 5037 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5038 << MD << (Data.OverloadedMethods.size() > 1); 5039 5040 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5041 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5042 Diag(overloadedMD->getLocation(), 5043 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5044 } 5045 } 5046} 5047 5048void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5049 Decl *TagDecl, 5050 SourceLocation LBrac, 5051 SourceLocation RBrac, 5052 AttributeList *AttrList) { 5053 if (!TagDecl) 5054 return; 5055 5056 AdjustDeclIfTemplate(TagDecl); 5057 5058 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5059 // strict aliasing violation! 5060 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5061 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5062 5063 CheckCompletedCXXClass( 5064 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5065} 5066 5067/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5068/// special functions, such as the default constructor, copy 5069/// constructor, or destructor, to the given C++ class (C++ 5070/// [special]p1). This routine can only be executed just before the 5071/// definition of the class is complete. 5072void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5073 if (!ClassDecl->hasUserDeclaredConstructor()) 5074 ++ASTContext::NumImplicitDefaultConstructors; 5075 5076 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 5077 ++ASTContext::NumImplicitCopyConstructors; 5078 5079 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 5080 ++ASTContext::NumImplicitMoveConstructors; 5081 5082 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5083 ++ASTContext::NumImplicitCopyAssignmentOperators; 5084 5085 // If we have a dynamic class, then the copy assignment operator may be 5086 // virtual, so we have to declare it immediately. This ensures that, e.g., 5087 // it shows up in the right place in the vtable and that we diagnose 5088 // problems with the implicit exception specification. 5089 if (ClassDecl->isDynamicClass()) 5090 DeclareImplicitCopyAssignment(ClassDecl); 5091 } 5092 5093 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 5094 ++ASTContext::NumImplicitMoveAssignmentOperators; 5095 5096 // Likewise for the move assignment operator. 5097 if (ClassDecl->isDynamicClass()) 5098 DeclareImplicitMoveAssignment(ClassDecl); 5099 } 5100 5101 if (!ClassDecl->hasUserDeclaredDestructor()) { 5102 ++ASTContext::NumImplicitDestructors; 5103 5104 // If we have a dynamic class, then the destructor may be virtual, so we 5105 // have to declare the destructor immediately. This ensures that, e.g., it 5106 // shows up in the right place in the vtable and that we diagnose problems 5107 // with the implicit exception specification. 5108 if (ClassDecl->isDynamicClass()) 5109 DeclareImplicitDestructor(ClassDecl); 5110 } 5111} 5112 5113void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5114 if (!D) 5115 return; 5116 5117 int NumParamList = D->getNumTemplateParameterLists(); 5118 for (int i = 0; i < NumParamList; i++) { 5119 TemplateParameterList* Params = D->getTemplateParameterList(i); 5120 for (TemplateParameterList::iterator Param = Params->begin(), 5121 ParamEnd = Params->end(); 5122 Param != ParamEnd; ++Param) { 5123 NamedDecl *Named = cast<NamedDecl>(*Param); 5124 if (Named->getDeclName()) { 5125 S->AddDecl(Named); 5126 IdResolver.AddDecl(Named); 5127 } 5128 } 5129 } 5130} 5131 5132void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5133 if (!D) 5134 return; 5135 5136 TemplateParameterList *Params = 0; 5137 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5138 Params = Template->getTemplateParameters(); 5139 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5140 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5141 Params = PartialSpec->getTemplateParameters(); 5142 else 5143 return; 5144 5145 for (TemplateParameterList::iterator Param = Params->begin(), 5146 ParamEnd = Params->end(); 5147 Param != ParamEnd; ++Param) { 5148 NamedDecl *Named = cast<NamedDecl>(*Param); 5149 if (Named->getDeclName()) { 5150 S->AddDecl(Named); 5151 IdResolver.AddDecl(Named); 5152 } 5153 } 5154} 5155 5156void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5157 if (!RecordD) return; 5158 AdjustDeclIfTemplate(RecordD); 5159 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5160 PushDeclContext(S, Record); 5161} 5162 5163void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5164 if (!RecordD) return; 5165 PopDeclContext(); 5166} 5167 5168/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5169/// parsing a top-level (non-nested) C++ class, and we are now 5170/// parsing those parts of the given Method declaration that could 5171/// not be parsed earlier (C++ [class.mem]p2), such as default 5172/// arguments. This action should enter the scope of the given 5173/// Method declaration as if we had just parsed the qualified method 5174/// name. However, it should not bring the parameters into scope; 5175/// that will be performed by ActOnDelayedCXXMethodParameter. 5176void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5177} 5178 5179/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5180/// C++ method declaration. We're (re-)introducing the given 5181/// function parameter into scope for use in parsing later parts of 5182/// the method declaration. For example, we could see an 5183/// ActOnParamDefaultArgument event for this parameter. 5184void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5185 if (!ParamD) 5186 return; 5187 5188 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5189 5190 // If this parameter has an unparsed default argument, clear it out 5191 // to make way for the parsed default argument. 5192 if (Param->hasUnparsedDefaultArg()) 5193 Param->setDefaultArg(0); 5194 5195 S->AddDecl(Param); 5196 if (Param->getDeclName()) 5197 IdResolver.AddDecl(Param); 5198} 5199 5200/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5201/// processing the delayed method declaration for Method. The method 5202/// declaration is now considered finished. There may be a separate 5203/// ActOnStartOfFunctionDef action later (not necessarily 5204/// immediately!) for this method, if it was also defined inside the 5205/// class body. 5206void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5207 if (!MethodD) 5208 return; 5209 5210 AdjustDeclIfTemplate(MethodD); 5211 5212 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5213 5214 // Now that we have our default arguments, check the constructor 5215 // again. It could produce additional diagnostics or affect whether 5216 // the class has implicitly-declared destructors, among other 5217 // things. 5218 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5219 CheckConstructor(Constructor); 5220 5221 // Check the default arguments, which we may have added. 5222 if (!Method->isInvalidDecl()) 5223 CheckCXXDefaultArguments(Method); 5224} 5225 5226/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5227/// the well-formedness of the constructor declarator @p D with type @p 5228/// R. If there are any errors in the declarator, this routine will 5229/// emit diagnostics and set the invalid bit to true. In any case, the type 5230/// will be updated to reflect a well-formed type for the constructor and 5231/// returned. 5232QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5233 StorageClass &SC) { 5234 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5235 5236 // C++ [class.ctor]p3: 5237 // A constructor shall not be virtual (10.3) or static (9.4). A 5238 // constructor can be invoked for a const, volatile or const 5239 // volatile object. A constructor shall not be declared const, 5240 // volatile, or const volatile (9.3.2). 5241 if (isVirtual) { 5242 if (!D.isInvalidType()) 5243 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5244 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5245 << SourceRange(D.getIdentifierLoc()); 5246 D.setInvalidType(); 5247 } 5248 if (SC == SC_Static) { 5249 if (!D.isInvalidType()) 5250 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5251 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5252 << SourceRange(D.getIdentifierLoc()); 5253 D.setInvalidType(); 5254 SC = SC_None; 5255 } 5256 5257 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5258 if (FTI.TypeQuals != 0) { 5259 if (FTI.TypeQuals & Qualifiers::Const) 5260 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5261 << "const" << SourceRange(D.getIdentifierLoc()); 5262 if (FTI.TypeQuals & Qualifiers::Volatile) 5263 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5264 << "volatile" << SourceRange(D.getIdentifierLoc()); 5265 if (FTI.TypeQuals & Qualifiers::Restrict) 5266 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5267 << "restrict" << SourceRange(D.getIdentifierLoc()); 5268 D.setInvalidType(); 5269 } 5270 5271 // C++0x [class.ctor]p4: 5272 // A constructor shall not be declared with a ref-qualifier. 5273 if (FTI.hasRefQualifier()) { 5274 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5275 << FTI.RefQualifierIsLValueRef 5276 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5277 D.setInvalidType(); 5278 } 5279 5280 // Rebuild the function type "R" without any type qualifiers (in 5281 // case any of the errors above fired) and with "void" as the 5282 // return type, since constructors don't have return types. 5283 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5284 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5285 return R; 5286 5287 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5288 EPI.TypeQuals = 0; 5289 EPI.RefQualifier = RQ_None; 5290 5291 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5292 Proto->getNumArgs(), EPI); 5293} 5294 5295/// CheckConstructor - Checks a fully-formed constructor for 5296/// well-formedness, issuing any diagnostics required. Returns true if 5297/// the constructor declarator is invalid. 5298void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5299 CXXRecordDecl *ClassDecl 5300 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5301 if (!ClassDecl) 5302 return Constructor->setInvalidDecl(); 5303 5304 // C++ [class.copy]p3: 5305 // A declaration of a constructor for a class X is ill-formed if 5306 // its first parameter is of type (optionally cv-qualified) X and 5307 // either there are no other parameters or else all other 5308 // parameters have default arguments. 5309 if (!Constructor->isInvalidDecl() && 5310 ((Constructor->getNumParams() == 1) || 5311 (Constructor->getNumParams() > 1 && 5312 Constructor->getParamDecl(1)->hasDefaultArg())) && 5313 Constructor->getTemplateSpecializationKind() 5314 != TSK_ImplicitInstantiation) { 5315 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5316 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5317 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5318 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5319 const char *ConstRef 5320 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5321 : " const &"; 5322 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5323 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5324 5325 // FIXME: Rather that making the constructor invalid, we should endeavor 5326 // to fix the type. 5327 Constructor->setInvalidDecl(); 5328 } 5329 } 5330} 5331 5332/// CheckDestructor - Checks a fully-formed destructor definition for 5333/// well-formedness, issuing any diagnostics required. Returns true 5334/// on error. 5335bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5336 CXXRecordDecl *RD = Destructor->getParent(); 5337 5338 if (Destructor->isVirtual()) { 5339 SourceLocation Loc; 5340 5341 if (!Destructor->isImplicit()) 5342 Loc = Destructor->getLocation(); 5343 else 5344 Loc = RD->getLocation(); 5345 5346 // If we have a virtual destructor, look up the deallocation function 5347 FunctionDecl *OperatorDelete = 0; 5348 DeclarationName Name = 5349 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5350 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5351 return true; 5352 5353 MarkFunctionReferenced(Loc, OperatorDelete); 5354 5355 Destructor->setOperatorDelete(OperatorDelete); 5356 } 5357 5358 return false; 5359} 5360 5361static inline bool 5362FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5363 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5364 FTI.ArgInfo[0].Param && 5365 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5366} 5367 5368/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5369/// the well-formednes of the destructor declarator @p D with type @p 5370/// R. If there are any errors in the declarator, this routine will 5371/// emit diagnostics and set the declarator to invalid. Even if this happens, 5372/// will be updated to reflect a well-formed type for the destructor and 5373/// returned. 5374QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5375 StorageClass& SC) { 5376 // C++ [class.dtor]p1: 5377 // [...] A typedef-name that names a class is a class-name 5378 // (7.1.3); however, a typedef-name that names a class shall not 5379 // be used as the identifier in the declarator for a destructor 5380 // declaration. 5381 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5382 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5383 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5384 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5385 else if (const TemplateSpecializationType *TST = 5386 DeclaratorType->getAs<TemplateSpecializationType>()) 5387 if (TST->isTypeAlias()) 5388 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5389 << DeclaratorType << 1; 5390 5391 // C++ [class.dtor]p2: 5392 // A destructor is used to destroy objects of its class type. A 5393 // destructor takes no parameters, and no return type can be 5394 // specified for it (not even void). The address of a destructor 5395 // shall not be taken. A destructor shall not be static. A 5396 // destructor can be invoked for a const, volatile or const 5397 // volatile object. A destructor shall not be declared const, 5398 // volatile or const volatile (9.3.2). 5399 if (SC == SC_Static) { 5400 if (!D.isInvalidType()) 5401 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5402 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5403 << SourceRange(D.getIdentifierLoc()) 5404 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5405 5406 SC = SC_None; 5407 } 5408 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5409 // Destructors don't have return types, but the parser will 5410 // happily parse something like: 5411 // 5412 // class X { 5413 // float ~X(); 5414 // }; 5415 // 5416 // The return type will be eliminated later. 5417 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5418 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5419 << SourceRange(D.getIdentifierLoc()); 5420 } 5421 5422 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5423 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5424 if (FTI.TypeQuals & Qualifiers::Const) 5425 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5426 << "const" << SourceRange(D.getIdentifierLoc()); 5427 if (FTI.TypeQuals & Qualifiers::Volatile) 5428 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5429 << "volatile" << SourceRange(D.getIdentifierLoc()); 5430 if (FTI.TypeQuals & Qualifiers::Restrict) 5431 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5432 << "restrict" << SourceRange(D.getIdentifierLoc()); 5433 D.setInvalidType(); 5434 } 5435 5436 // C++0x [class.dtor]p2: 5437 // A destructor shall not be declared with a ref-qualifier. 5438 if (FTI.hasRefQualifier()) { 5439 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5440 << FTI.RefQualifierIsLValueRef 5441 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5442 D.setInvalidType(); 5443 } 5444 5445 // Make sure we don't have any parameters. 5446 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5447 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5448 5449 // Delete the parameters. 5450 FTI.freeArgs(); 5451 D.setInvalidType(); 5452 } 5453 5454 // Make sure the destructor isn't variadic. 5455 if (FTI.isVariadic) { 5456 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5457 D.setInvalidType(); 5458 } 5459 5460 // Rebuild the function type "R" without any type qualifiers or 5461 // parameters (in case any of the errors above fired) and with 5462 // "void" as the return type, since destructors don't have return 5463 // types. 5464 if (!D.isInvalidType()) 5465 return R; 5466 5467 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5468 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5469 EPI.Variadic = false; 5470 EPI.TypeQuals = 0; 5471 EPI.RefQualifier = RQ_None; 5472 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5473} 5474 5475/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5476/// well-formednes of the conversion function declarator @p D with 5477/// type @p R. If there are any errors in the declarator, this routine 5478/// will emit diagnostics and return true. Otherwise, it will return 5479/// false. Either way, the type @p R will be updated to reflect a 5480/// well-formed type for the conversion operator. 5481void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5482 StorageClass& SC) { 5483 // C++ [class.conv.fct]p1: 5484 // Neither parameter types nor return type can be specified. The 5485 // type of a conversion function (8.3.5) is "function taking no 5486 // parameter returning conversion-type-id." 5487 if (SC == SC_Static) { 5488 if (!D.isInvalidType()) 5489 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5490 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5491 << SourceRange(D.getIdentifierLoc()); 5492 D.setInvalidType(); 5493 SC = SC_None; 5494 } 5495 5496 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5497 5498 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5499 // Conversion functions don't have return types, but the parser will 5500 // happily parse something like: 5501 // 5502 // class X { 5503 // float operator bool(); 5504 // }; 5505 // 5506 // The return type will be changed later anyway. 5507 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5508 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5509 << SourceRange(D.getIdentifierLoc()); 5510 D.setInvalidType(); 5511 } 5512 5513 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5514 5515 // Make sure we don't have any parameters. 5516 if (Proto->getNumArgs() > 0) { 5517 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5518 5519 // Delete the parameters. 5520 D.getFunctionTypeInfo().freeArgs(); 5521 D.setInvalidType(); 5522 } else if (Proto->isVariadic()) { 5523 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5524 D.setInvalidType(); 5525 } 5526 5527 // Diagnose "&operator bool()" and other such nonsense. This 5528 // is actually a gcc extension which we don't support. 5529 if (Proto->getResultType() != ConvType) { 5530 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5531 << Proto->getResultType(); 5532 D.setInvalidType(); 5533 ConvType = Proto->getResultType(); 5534 } 5535 5536 // C++ [class.conv.fct]p4: 5537 // The conversion-type-id shall not represent a function type nor 5538 // an array type. 5539 if (ConvType->isArrayType()) { 5540 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5541 ConvType = Context.getPointerType(ConvType); 5542 D.setInvalidType(); 5543 } else if (ConvType->isFunctionType()) { 5544 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5545 ConvType = Context.getPointerType(ConvType); 5546 D.setInvalidType(); 5547 } 5548 5549 // Rebuild the function type "R" without any parameters (in case any 5550 // of the errors above fired) and with the conversion type as the 5551 // return type. 5552 if (D.isInvalidType()) 5553 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5554 5555 // C++0x explicit conversion operators. 5556 if (D.getDeclSpec().isExplicitSpecified()) 5557 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5558 getLangOptions().CPlusPlus0x ? 5559 diag::warn_cxx98_compat_explicit_conversion_functions : 5560 diag::ext_explicit_conversion_functions) 5561 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5562} 5563 5564/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5565/// the declaration of the given C++ conversion function. This routine 5566/// is responsible for recording the conversion function in the C++ 5567/// class, if possible. 5568Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5569 assert(Conversion && "Expected to receive a conversion function declaration"); 5570 5571 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5572 5573 // Make sure we aren't redeclaring the conversion function. 5574 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5575 5576 // C++ [class.conv.fct]p1: 5577 // [...] A conversion function is never used to convert a 5578 // (possibly cv-qualified) object to the (possibly cv-qualified) 5579 // same object type (or a reference to it), to a (possibly 5580 // cv-qualified) base class of that type (or a reference to it), 5581 // or to (possibly cv-qualified) void. 5582 // FIXME: Suppress this warning if the conversion function ends up being a 5583 // virtual function that overrides a virtual function in a base class. 5584 QualType ClassType 5585 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5586 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5587 ConvType = ConvTypeRef->getPointeeType(); 5588 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5589 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5590 /* Suppress diagnostics for instantiations. */; 5591 else if (ConvType->isRecordType()) { 5592 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5593 if (ConvType == ClassType) 5594 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5595 << ClassType; 5596 else if (IsDerivedFrom(ClassType, ConvType)) 5597 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5598 << ClassType << ConvType; 5599 } else if (ConvType->isVoidType()) { 5600 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5601 << ClassType << ConvType; 5602 } 5603 5604 if (FunctionTemplateDecl *ConversionTemplate 5605 = Conversion->getDescribedFunctionTemplate()) 5606 return ConversionTemplate; 5607 5608 return Conversion; 5609} 5610 5611//===----------------------------------------------------------------------===// 5612// Namespace Handling 5613//===----------------------------------------------------------------------===// 5614 5615 5616 5617/// ActOnStartNamespaceDef - This is called at the start of a namespace 5618/// definition. 5619Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5620 SourceLocation InlineLoc, 5621 SourceLocation NamespaceLoc, 5622 SourceLocation IdentLoc, 5623 IdentifierInfo *II, 5624 SourceLocation LBrace, 5625 AttributeList *AttrList) { 5626 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5627 // For anonymous namespace, take the location of the left brace. 5628 SourceLocation Loc = II ? IdentLoc : LBrace; 5629 bool IsInline = InlineLoc.isValid(); 5630 bool IsInvalid = false; 5631 bool IsStd = false; 5632 bool AddToKnown = false; 5633 Scope *DeclRegionScope = NamespcScope->getParent(); 5634 5635 NamespaceDecl *PrevNS = 0; 5636 if (II) { 5637 // C++ [namespace.def]p2: 5638 // The identifier in an original-namespace-definition shall not 5639 // have been previously defined in the declarative region in 5640 // which the original-namespace-definition appears. The 5641 // identifier in an original-namespace-definition is the name of 5642 // the namespace. Subsequently in that declarative region, it is 5643 // treated as an original-namespace-name. 5644 // 5645 // Since namespace names are unique in their scope, and we don't 5646 // look through using directives, just look for any ordinary names. 5647 5648 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5649 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5650 Decl::IDNS_Namespace; 5651 NamedDecl *PrevDecl = 0; 5652 for (DeclContext::lookup_result R 5653 = CurContext->getRedeclContext()->lookup(II); 5654 R.first != R.second; ++R.first) { 5655 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5656 PrevDecl = *R.first; 5657 break; 5658 } 5659 } 5660 5661 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5662 5663 if (PrevNS) { 5664 // This is an extended namespace definition. 5665 if (IsInline != PrevNS->isInline()) { 5666 // inline-ness must match 5667 if (PrevNS->isInline()) { 5668 // The user probably just forgot the 'inline', so suggest that it 5669 // be added back. 5670 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5671 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5672 } else { 5673 Diag(Loc, diag::err_inline_namespace_mismatch) 5674 << IsInline; 5675 } 5676 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5677 5678 IsInline = PrevNS->isInline(); 5679 } 5680 } else if (PrevDecl) { 5681 // This is an invalid name redefinition. 5682 Diag(Loc, diag::err_redefinition_different_kind) 5683 << II; 5684 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5685 IsInvalid = true; 5686 // Continue on to push Namespc as current DeclContext and return it. 5687 } else if (II->isStr("std") && 5688 CurContext->getRedeclContext()->isTranslationUnit()) { 5689 // This is the first "real" definition of the namespace "std", so update 5690 // our cache of the "std" namespace to point at this definition. 5691 PrevNS = getStdNamespace(); 5692 IsStd = true; 5693 AddToKnown = !IsInline; 5694 } else { 5695 // We've seen this namespace for the first time. 5696 AddToKnown = !IsInline; 5697 } 5698 } else { 5699 // Anonymous namespaces. 5700 5701 // Determine whether the parent already has an anonymous namespace. 5702 DeclContext *Parent = CurContext->getRedeclContext(); 5703 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5704 PrevNS = TU->getAnonymousNamespace(); 5705 } else { 5706 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5707 PrevNS = ND->getAnonymousNamespace(); 5708 } 5709 5710 if (PrevNS && IsInline != PrevNS->isInline()) { 5711 // inline-ness must match 5712 Diag(Loc, diag::err_inline_namespace_mismatch) 5713 << IsInline; 5714 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5715 5716 // Recover by ignoring the new namespace's inline status. 5717 IsInline = PrevNS->isInline(); 5718 } 5719 } 5720 5721 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5722 StartLoc, Loc, II, PrevNS); 5723 if (IsInvalid) 5724 Namespc->setInvalidDecl(); 5725 5726 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5727 5728 // FIXME: Should we be merging attributes? 5729 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5730 PushNamespaceVisibilityAttr(Attr, Loc); 5731 5732 if (IsStd) 5733 StdNamespace = Namespc; 5734 if (AddToKnown) 5735 KnownNamespaces[Namespc] = false; 5736 5737 if (II) { 5738 PushOnScopeChains(Namespc, DeclRegionScope); 5739 } else { 5740 // Link the anonymous namespace into its parent. 5741 DeclContext *Parent = CurContext->getRedeclContext(); 5742 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5743 TU->setAnonymousNamespace(Namespc); 5744 } else { 5745 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5746 } 5747 5748 CurContext->addDecl(Namespc); 5749 5750 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5751 // behaves as if it were replaced by 5752 // namespace unique { /* empty body */ } 5753 // using namespace unique; 5754 // namespace unique { namespace-body } 5755 // where all occurrences of 'unique' in a translation unit are 5756 // replaced by the same identifier and this identifier differs 5757 // from all other identifiers in the entire program. 5758 5759 // We just create the namespace with an empty name and then add an 5760 // implicit using declaration, just like the standard suggests. 5761 // 5762 // CodeGen enforces the "universally unique" aspect by giving all 5763 // declarations semantically contained within an anonymous 5764 // namespace internal linkage. 5765 5766 if (!PrevNS) { 5767 UsingDirectiveDecl* UD 5768 = UsingDirectiveDecl::Create(Context, CurContext, 5769 /* 'using' */ LBrace, 5770 /* 'namespace' */ SourceLocation(), 5771 /* qualifier */ NestedNameSpecifierLoc(), 5772 /* identifier */ SourceLocation(), 5773 Namespc, 5774 /* Ancestor */ CurContext); 5775 UD->setImplicit(); 5776 CurContext->addDecl(UD); 5777 } 5778 } 5779 5780 // Although we could have an invalid decl (i.e. the namespace name is a 5781 // redefinition), push it as current DeclContext and try to continue parsing. 5782 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5783 // for the namespace has the declarations that showed up in that particular 5784 // namespace definition. 5785 PushDeclContext(NamespcScope, Namespc); 5786 return Namespc; 5787} 5788 5789/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5790/// is a namespace alias, returns the namespace it points to. 5791static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5792 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5793 return AD->getNamespace(); 5794 return dyn_cast_or_null<NamespaceDecl>(D); 5795} 5796 5797/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5798/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5799void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5800 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5801 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5802 Namespc->setRBraceLoc(RBrace); 5803 PopDeclContext(); 5804 if (Namespc->hasAttr<VisibilityAttr>()) 5805 PopPragmaVisibility(true, RBrace); 5806} 5807 5808CXXRecordDecl *Sema::getStdBadAlloc() const { 5809 return cast_or_null<CXXRecordDecl>( 5810 StdBadAlloc.get(Context.getExternalSource())); 5811} 5812 5813NamespaceDecl *Sema::getStdNamespace() const { 5814 return cast_or_null<NamespaceDecl>( 5815 StdNamespace.get(Context.getExternalSource())); 5816} 5817 5818/// \brief Retrieve the special "std" namespace, which may require us to 5819/// implicitly define the namespace. 5820NamespaceDecl *Sema::getOrCreateStdNamespace() { 5821 if (!StdNamespace) { 5822 // The "std" namespace has not yet been defined, so build one implicitly. 5823 StdNamespace = NamespaceDecl::Create(Context, 5824 Context.getTranslationUnitDecl(), 5825 /*Inline=*/false, 5826 SourceLocation(), SourceLocation(), 5827 &PP.getIdentifierTable().get("std"), 5828 /*PrevDecl=*/0); 5829 getStdNamespace()->setImplicit(true); 5830 } 5831 5832 return getStdNamespace(); 5833} 5834 5835bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5836 assert(getLangOptions().CPlusPlus && 5837 "Looking for std::initializer_list outside of C++."); 5838 5839 // We're looking for implicit instantiations of 5840 // template <typename E> class std::initializer_list. 5841 5842 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5843 return false; 5844 5845 ClassTemplateDecl *Template = 0; 5846 const TemplateArgument *Arguments = 0; 5847 5848 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5849 5850 ClassTemplateSpecializationDecl *Specialization = 5851 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5852 if (!Specialization) 5853 return false; 5854 5855 Template = Specialization->getSpecializedTemplate(); 5856 Arguments = Specialization->getTemplateArgs().data(); 5857 } else if (const TemplateSpecializationType *TST = 5858 Ty->getAs<TemplateSpecializationType>()) { 5859 Template = dyn_cast_or_null<ClassTemplateDecl>( 5860 TST->getTemplateName().getAsTemplateDecl()); 5861 Arguments = TST->getArgs(); 5862 } 5863 if (!Template) 5864 return false; 5865 5866 if (!StdInitializerList) { 5867 // Haven't recognized std::initializer_list yet, maybe this is it. 5868 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5869 if (TemplateClass->getIdentifier() != 5870 &PP.getIdentifierTable().get("initializer_list") || 5871 !getStdNamespace()->InEnclosingNamespaceSetOf( 5872 TemplateClass->getDeclContext())) 5873 return false; 5874 // This is a template called std::initializer_list, but is it the right 5875 // template? 5876 TemplateParameterList *Params = Template->getTemplateParameters(); 5877 if (Params->getMinRequiredArguments() != 1) 5878 return false; 5879 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5880 return false; 5881 5882 // It's the right template. 5883 StdInitializerList = Template; 5884 } 5885 5886 if (Template != StdInitializerList) 5887 return false; 5888 5889 // This is an instance of std::initializer_list. Find the argument type. 5890 if (Element) 5891 *Element = Arguments[0].getAsType(); 5892 return true; 5893} 5894 5895static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5896 NamespaceDecl *Std = S.getStdNamespace(); 5897 if (!Std) { 5898 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5899 return 0; 5900 } 5901 5902 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5903 Loc, Sema::LookupOrdinaryName); 5904 if (!S.LookupQualifiedName(Result, Std)) { 5905 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5906 return 0; 5907 } 5908 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5909 if (!Template) { 5910 Result.suppressDiagnostics(); 5911 // We found something weird. Complain about the first thing we found. 5912 NamedDecl *Found = *Result.begin(); 5913 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5914 return 0; 5915 } 5916 5917 // We found some template called std::initializer_list. Now verify that it's 5918 // correct. 5919 TemplateParameterList *Params = Template->getTemplateParameters(); 5920 if (Params->getMinRequiredArguments() != 1 || 5921 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5922 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5923 return 0; 5924 } 5925 5926 return Template; 5927} 5928 5929QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5930 if (!StdInitializerList) { 5931 StdInitializerList = LookupStdInitializerList(*this, Loc); 5932 if (!StdInitializerList) 5933 return QualType(); 5934 } 5935 5936 TemplateArgumentListInfo Args(Loc, Loc); 5937 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5938 Context.getTrivialTypeSourceInfo(Element, 5939 Loc))); 5940 return Context.getCanonicalType( 5941 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5942} 5943 5944bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5945 // C++ [dcl.init.list]p2: 5946 // A constructor is an initializer-list constructor if its first parameter 5947 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5948 // std::initializer_list<E> for some type E, and either there are no other 5949 // parameters or else all other parameters have default arguments. 5950 if (Ctor->getNumParams() < 1 || 5951 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5952 return false; 5953 5954 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5955 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5956 ArgType = RT->getPointeeType().getUnqualifiedType(); 5957 5958 return isStdInitializerList(ArgType, 0); 5959} 5960 5961/// \brief Determine whether a using statement is in a context where it will be 5962/// apply in all contexts. 5963static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5964 switch (CurContext->getDeclKind()) { 5965 case Decl::TranslationUnit: 5966 return true; 5967 case Decl::LinkageSpec: 5968 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5969 default: 5970 return false; 5971 } 5972} 5973 5974namespace { 5975 5976// Callback to only accept typo corrections that are namespaces. 5977class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5978 public: 5979 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5980 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5981 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5982 } 5983 return false; 5984 } 5985}; 5986 5987} 5988 5989static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5990 CXXScopeSpec &SS, 5991 SourceLocation IdentLoc, 5992 IdentifierInfo *Ident) { 5993 NamespaceValidatorCCC Validator; 5994 R.clear(); 5995 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5996 R.getLookupKind(), Sc, &SS, 5997 Validator)) { 5998 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5999 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 6000 if (DeclContext *DC = S.computeDeclContext(SS, false)) 6001 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 6002 << Ident << DC << CorrectedQuotedStr << SS.getRange() 6003 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6004 else 6005 S.Diag(IdentLoc, diag::err_using_directive_suggest) 6006 << Ident << CorrectedQuotedStr 6007 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6008 6009 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 6010 diag::note_namespace_defined_here) << CorrectedQuotedStr; 6011 6012 Ident = Corrected.getCorrectionAsIdentifierInfo(); 6013 R.addDecl(Corrected.getCorrectionDecl()); 6014 return true; 6015 } 6016 return false; 6017} 6018 6019Decl *Sema::ActOnUsingDirective(Scope *S, 6020 SourceLocation UsingLoc, 6021 SourceLocation NamespcLoc, 6022 CXXScopeSpec &SS, 6023 SourceLocation IdentLoc, 6024 IdentifierInfo *NamespcName, 6025 AttributeList *AttrList) { 6026 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6027 assert(NamespcName && "Invalid NamespcName."); 6028 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6029 6030 // This can only happen along a recovery path. 6031 while (S->getFlags() & Scope::TemplateParamScope) 6032 S = S->getParent(); 6033 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6034 6035 UsingDirectiveDecl *UDir = 0; 6036 NestedNameSpecifier *Qualifier = 0; 6037 if (SS.isSet()) 6038 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6039 6040 // Lookup namespace name. 6041 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6042 LookupParsedName(R, S, &SS); 6043 if (R.isAmbiguous()) 6044 return 0; 6045 6046 if (R.empty()) { 6047 R.clear(); 6048 // Allow "using namespace std;" or "using namespace ::std;" even if 6049 // "std" hasn't been defined yet, for GCC compatibility. 6050 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6051 NamespcName->isStr("std")) { 6052 Diag(IdentLoc, diag::ext_using_undefined_std); 6053 R.addDecl(getOrCreateStdNamespace()); 6054 R.resolveKind(); 6055 } 6056 // Otherwise, attempt typo correction. 6057 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6058 } 6059 6060 if (!R.empty()) { 6061 NamedDecl *Named = R.getFoundDecl(); 6062 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6063 && "expected namespace decl"); 6064 // C++ [namespace.udir]p1: 6065 // A using-directive specifies that the names in the nominated 6066 // namespace can be used in the scope in which the 6067 // using-directive appears after the using-directive. During 6068 // unqualified name lookup (3.4.1), the names appear as if they 6069 // were declared in the nearest enclosing namespace which 6070 // contains both the using-directive and the nominated 6071 // namespace. [Note: in this context, "contains" means "contains 6072 // directly or indirectly". ] 6073 6074 // Find enclosing context containing both using-directive and 6075 // nominated namespace. 6076 NamespaceDecl *NS = getNamespaceDecl(Named); 6077 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6078 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6079 CommonAncestor = CommonAncestor->getParent(); 6080 6081 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6082 SS.getWithLocInContext(Context), 6083 IdentLoc, Named, CommonAncestor); 6084 6085 if (IsUsingDirectiveInToplevelContext(CurContext) && 6086 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6087 Diag(IdentLoc, diag::warn_using_directive_in_header); 6088 } 6089 6090 PushUsingDirective(S, UDir); 6091 } else { 6092 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6093 } 6094 6095 // FIXME: We ignore attributes for now. 6096 return UDir; 6097} 6098 6099void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6100 // If scope has associated entity, then using directive is at namespace 6101 // or translation unit scope. We add UsingDirectiveDecls, into 6102 // it's lookup structure. 6103 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 6104 Ctx->addDecl(UDir); 6105 else 6106 // Otherwise it is block-sope. using-directives will affect lookup 6107 // only to the end of scope. 6108 S->PushUsingDirective(UDir); 6109} 6110 6111 6112Decl *Sema::ActOnUsingDeclaration(Scope *S, 6113 AccessSpecifier AS, 6114 bool HasUsingKeyword, 6115 SourceLocation UsingLoc, 6116 CXXScopeSpec &SS, 6117 UnqualifiedId &Name, 6118 AttributeList *AttrList, 6119 bool IsTypeName, 6120 SourceLocation TypenameLoc) { 6121 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6122 6123 switch (Name.getKind()) { 6124 case UnqualifiedId::IK_ImplicitSelfParam: 6125 case UnqualifiedId::IK_Identifier: 6126 case UnqualifiedId::IK_OperatorFunctionId: 6127 case UnqualifiedId::IK_LiteralOperatorId: 6128 case UnqualifiedId::IK_ConversionFunctionId: 6129 break; 6130 6131 case UnqualifiedId::IK_ConstructorName: 6132 case UnqualifiedId::IK_ConstructorTemplateId: 6133 // C++0x inherited constructors. 6134 Diag(Name.getSourceRange().getBegin(), 6135 getLangOptions().CPlusPlus0x ? 6136 diag::warn_cxx98_compat_using_decl_constructor : 6137 diag::err_using_decl_constructor) 6138 << SS.getRange(); 6139 6140 if (getLangOptions().CPlusPlus0x) break; 6141 6142 return 0; 6143 6144 case UnqualifiedId::IK_DestructorName: 6145 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 6146 << SS.getRange(); 6147 return 0; 6148 6149 case UnqualifiedId::IK_TemplateId: 6150 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 6151 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6152 return 0; 6153 } 6154 6155 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6156 DeclarationName TargetName = TargetNameInfo.getName(); 6157 if (!TargetName) 6158 return 0; 6159 6160 // Warn about using declarations. 6161 // TODO: store that the declaration was written without 'using' and 6162 // talk about access decls instead of using decls in the 6163 // diagnostics. 6164 if (!HasUsingKeyword) { 6165 UsingLoc = Name.getSourceRange().getBegin(); 6166 6167 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6168 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6169 } 6170 6171 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6172 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6173 return 0; 6174 6175 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6176 TargetNameInfo, AttrList, 6177 /* IsInstantiation */ false, 6178 IsTypeName, TypenameLoc); 6179 if (UD) 6180 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6181 6182 return UD; 6183} 6184 6185/// \brief Determine whether a using declaration considers the given 6186/// declarations as "equivalent", e.g., if they are redeclarations of 6187/// the same entity or are both typedefs of the same type. 6188static bool 6189IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6190 bool &SuppressRedeclaration) { 6191 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6192 SuppressRedeclaration = false; 6193 return true; 6194 } 6195 6196 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6197 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6198 SuppressRedeclaration = true; 6199 return Context.hasSameType(TD1->getUnderlyingType(), 6200 TD2->getUnderlyingType()); 6201 } 6202 6203 return false; 6204} 6205 6206 6207/// Determines whether to create a using shadow decl for a particular 6208/// decl, given the set of decls existing prior to this using lookup. 6209bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6210 const LookupResult &Previous) { 6211 // Diagnose finding a decl which is not from a base class of the 6212 // current class. We do this now because there are cases where this 6213 // function will silently decide not to build a shadow decl, which 6214 // will pre-empt further diagnostics. 6215 // 6216 // We don't need to do this in C++0x because we do the check once on 6217 // the qualifier. 6218 // 6219 // FIXME: diagnose the following if we care enough: 6220 // struct A { int foo; }; 6221 // struct B : A { using A::foo; }; 6222 // template <class T> struct C : A {}; 6223 // template <class T> struct D : C<T> { using B::foo; } // <--- 6224 // This is invalid (during instantiation) in C++03 because B::foo 6225 // resolves to the using decl in B, which is not a base class of D<T>. 6226 // We can't diagnose it immediately because C<T> is an unknown 6227 // specialization. The UsingShadowDecl in D<T> then points directly 6228 // to A::foo, which will look well-formed when we instantiate. 6229 // The right solution is to not collapse the shadow-decl chain. 6230 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 6231 DeclContext *OrigDC = Orig->getDeclContext(); 6232 6233 // Handle enums and anonymous structs. 6234 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6235 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6236 while (OrigRec->isAnonymousStructOrUnion()) 6237 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6238 6239 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6240 if (OrigDC == CurContext) { 6241 Diag(Using->getLocation(), 6242 diag::err_using_decl_nested_name_specifier_is_current_class) 6243 << Using->getQualifierLoc().getSourceRange(); 6244 Diag(Orig->getLocation(), diag::note_using_decl_target); 6245 return true; 6246 } 6247 6248 Diag(Using->getQualifierLoc().getBeginLoc(), 6249 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6250 << Using->getQualifier() 6251 << cast<CXXRecordDecl>(CurContext) 6252 << Using->getQualifierLoc().getSourceRange(); 6253 Diag(Orig->getLocation(), diag::note_using_decl_target); 6254 return true; 6255 } 6256 } 6257 6258 if (Previous.empty()) return false; 6259 6260 NamedDecl *Target = Orig; 6261 if (isa<UsingShadowDecl>(Target)) 6262 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6263 6264 // If the target happens to be one of the previous declarations, we 6265 // don't have a conflict. 6266 // 6267 // FIXME: but we might be increasing its access, in which case we 6268 // should redeclare it. 6269 NamedDecl *NonTag = 0, *Tag = 0; 6270 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6271 I != E; ++I) { 6272 NamedDecl *D = (*I)->getUnderlyingDecl(); 6273 bool Result; 6274 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6275 return Result; 6276 6277 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6278 } 6279 6280 if (Target->isFunctionOrFunctionTemplate()) { 6281 FunctionDecl *FD; 6282 if (isa<FunctionTemplateDecl>(Target)) 6283 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6284 else 6285 FD = cast<FunctionDecl>(Target); 6286 6287 NamedDecl *OldDecl = 0; 6288 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6289 case Ovl_Overload: 6290 return false; 6291 6292 case Ovl_NonFunction: 6293 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6294 break; 6295 6296 // We found a decl with the exact signature. 6297 case Ovl_Match: 6298 // If we're in a record, we want to hide the target, so we 6299 // return true (without a diagnostic) to tell the caller not to 6300 // build a shadow decl. 6301 if (CurContext->isRecord()) 6302 return true; 6303 6304 // If we're not in a record, this is an error. 6305 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6306 break; 6307 } 6308 6309 Diag(Target->getLocation(), diag::note_using_decl_target); 6310 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6311 return true; 6312 } 6313 6314 // Target is not a function. 6315 6316 if (isa<TagDecl>(Target)) { 6317 // No conflict between a tag and a non-tag. 6318 if (!Tag) return false; 6319 6320 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6321 Diag(Target->getLocation(), diag::note_using_decl_target); 6322 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6323 return true; 6324 } 6325 6326 // No conflict between a tag and a non-tag. 6327 if (!NonTag) return false; 6328 6329 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6330 Diag(Target->getLocation(), diag::note_using_decl_target); 6331 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6332 return true; 6333} 6334 6335/// Builds a shadow declaration corresponding to a 'using' declaration. 6336UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6337 UsingDecl *UD, 6338 NamedDecl *Orig) { 6339 6340 // If we resolved to another shadow declaration, just coalesce them. 6341 NamedDecl *Target = Orig; 6342 if (isa<UsingShadowDecl>(Target)) { 6343 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6344 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6345 } 6346 6347 UsingShadowDecl *Shadow 6348 = UsingShadowDecl::Create(Context, CurContext, 6349 UD->getLocation(), UD, Target); 6350 UD->addShadowDecl(Shadow); 6351 6352 Shadow->setAccess(UD->getAccess()); 6353 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6354 Shadow->setInvalidDecl(); 6355 6356 if (S) 6357 PushOnScopeChains(Shadow, S); 6358 else 6359 CurContext->addDecl(Shadow); 6360 6361 6362 return Shadow; 6363} 6364 6365/// Hides a using shadow declaration. This is required by the current 6366/// using-decl implementation when a resolvable using declaration in a 6367/// class is followed by a declaration which would hide or override 6368/// one or more of the using decl's targets; for example: 6369/// 6370/// struct Base { void foo(int); }; 6371/// struct Derived : Base { 6372/// using Base::foo; 6373/// void foo(int); 6374/// }; 6375/// 6376/// The governing language is C++03 [namespace.udecl]p12: 6377/// 6378/// When a using-declaration brings names from a base class into a 6379/// derived class scope, member functions in the derived class 6380/// override and/or hide member functions with the same name and 6381/// parameter types in a base class (rather than conflicting). 6382/// 6383/// There are two ways to implement this: 6384/// (1) optimistically create shadow decls when they're not hidden 6385/// by existing declarations, or 6386/// (2) don't create any shadow decls (or at least don't make them 6387/// visible) until we've fully parsed/instantiated the class. 6388/// The problem with (1) is that we might have to retroactively remove 6389/// a shadow decl, which requires several O(n) operations because the 6390/// decl structures are (very reasonably) not designed for removal. 6391/// (2) avoids this but is very fiddly and phase-dependent. 6392void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6393 if (Shadow->getDeclName().getNameKind() == 6394 DeclarationName::CXXConversionFunctionName) 6395 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6396 6397 // Remove it from the DeclContext... 6398 Shadow->getDeclContext()->removeDecl(Shadow); 6399 6400 // ...and the scope, if applicable... 6401 if (S) { 6402 S->RemoveDecl(Shadow); 6403 IdResolver.RemoveDecl(Shadow); 6404 } 6405 6406 // ...and the using decl. 6407 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6408 6409 // TODO: complain somehow if Shadow was used. It shouldn't 6410 // be possible for this to happen, because...? 6411} 6412 6413/// Builds a using declaration. 6414/// 6415/// \param IsInstantiation - Whether this call arises from an 6416/// instantiation of an unresolved using declaration. We treat 6417/// the lookup differently for these declarations. 6418NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6419 SourceLocation UsingLoc, 6420 CXXScopeSpec &SS, 6421 const DeclarationNameInfo &NameInfo, 6422 AttributeList *AttrList, 6423 bool IsInstantiation, 6424 bool IsTypeName, 6425 SourceLocation TypenameLoc) { 6426 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6427 SourceLocation IdentLoc = NameInfo.getLoc(); 6428 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6429 6430 // FIXME: We ignore attributes for now. 6431 6432 if (SS.isEmpty()) { 6433 Diag(IdentLoc, diag::err_using_requires_qualname); 6434 return 0; 6435 } 6436 6437 // Do the redeclaration lookup in the current scope. 6438 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6439 ForRedeclaration); 6440 Previous.setHideTags(false); 6441 if (S) { 6442 LookupName(Previous, S); 6443 6444 // It is really dumb that we have to do this. 6445 LookupResult::Filter F = Previous.makeFilter(); 6446 while (F.hasNext()) { 6447 NamedDecl *D = F.next(); 6448 if (!isDeclInScope(D, CurContext, S)) 6449 F.erase(); 6450 } 6451 F.done(); 6452 } else { 6453 assert(IsInstantiation && "no scope in non-instantiation"); 6454 assert(CurContext->isRecord() && "scope not record in instantiation"); 6455 LookupQualifiedName(Previous, CurContext); 6456 } 6457 6458 // Check for invalid redeclarations. 6459 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6460 return 0; 6461 6462 // Check for bad qualifiers. 6463 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6464 return 0; 6465 6466 DeclContext *LookupContext = computeDeclContext(SS); 6467 NamedDecl *D; 6468 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6469 if (!LookupContext) { 6470 if (IsTypeName) { 6471 // FIXME: not all declaration name kinds are legal here 6472 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6473 UsingLoc, TypenameLoc, 6474 QualifierLoc, 6475 IdentLoc, NameInfo.getName()); 6476 } else { 6477 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6478 QualifierLoc, NameInfo); 6479 } 6480 } else { 6481 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6482 NameInfo, IsTypeName); 6483 } 6484 D->setAccess(AS); 6485 CurContext->addDecl(D); 6486 6487 if (!LookupContext) return D; 6488 UsingDecl *UD = cast<UsingDecl>(D); 6489 6490 if (RequireCompleteDeclContext(SS, LookupContext)) { 6491 UD->setInvalidDecl(); 6492 return UD; 6493 } 6494 6495 // Constructor inheriting using decls get special treatment. 6496 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6497 if (CheckInheritedConstructorUsingDecl(UD)) 6498 UD->setInvalidDecl(); 6499 return UD; 6500 } 6501 6502 // Otherwise, look up the target name. 6503 6504 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6505 6506 // Unlike most lookups, we don't always want to hide tag 6507 // declarations: tag names are visible through the using declaration 6508 // even if hidden by ordinary names, *except* in a dependent context 6509 // where it's important for the sanity of two-phase lookup. 6510 if (!IsInstantiation) 6511 R.setHideTags(false); 6512 6513 LookupQualifiedName(R, LookupContext); 6514 6515 if (R.empty()) { 6516 Diag(IdentLoc, diag::err_no_member) 6517 << NameInfo.getName() << LookupContext << SS.getRange(); 6518 UD->setInvalidDecl(); 6519 return UD; 6520 } 6521 6522 if (R.isAmbiguous()) { 6523 UD->setInvalidDecl(); 6524 return UD; 6525 } 6526 6527 if (IsTypeName) { 6528 // If we asked for a typename and got a non-type decl, error out. 6529 if (!R.getAsSingle<TypeDecl>()) { 6530 Diag(IdentLoc, diag::err_using_typename_non_type); 6531 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6532 Diag((*I)->getUnderlyingDecl()->getLocation(), 6533 diag::note_using_decl_target); 6534 UD->setInvalidDecl(); 6535 return UD; 6536 } 6537 } else { 6538 // If we asked for a non-typename and we got a type, error out, 6539 // but only if this is an instantiation of an unresolved using 6540 // decl. Otherwise just silently find the type name. 6541 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6542 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6543 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6544 UD->setInvalidDecl(); 6545 return UD; 6546 } 6547 } 6548 6549 // C++0x N2914 [namespace.udecl]p6: 6550 // A using-declaration shall not name a namespace. 6551 if (R.getAsSingle<NamespaceDecl>()) { 6552 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6553 << SS.getRange(); 6554 UD->setInvalidDecl(); 6555 return UD; 6556 } 6557 6558 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6559 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6560 BuildUsingShadowDecl(S, UD, *I); 6561 } 6562 6563 return UD; 6564} 6565 6566/// Additional checks for a using declaration referring to a constructor name. 6567bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6568 if (UD->isTypeName()) { 6569 // FIXME: Cannot specify typename when specifying constructor 6570 return true; 6571 } 6572 6573 const Type *SourceType = UD->getQualifier()->getAsType(); 6574 assert(SourceType && 6575 "Using decl naming constructor doesn't have type in scope spec."); 6576 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6577 6578 // Check whether the named type is a direct base class. 6579 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6580 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6581 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6582 BaseIt != BaseE; ++BaseIt) { 6583 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6584 if (CanonicalSourceType == BaseType) 6585 break; 6586 } 6587 6588 if (BaseIt == BaseE) { 6589 // Did not find SourceType in the bases. 6590 Diag(UD->getUsingLocation(), 6591 diag::err_using_decl_constructor_not_in_direct_base) 6592 << UD->getNameInfo().getSourceRange() 6593 << QualType(SourceType, 0) << TargetClass; 6594 return true; 6595 } 6596 6597 BaseIt->setInheritConstructors(); 6598 6599 return false; 6600} 6601 6602/// Checks that the given using declaration is not an invalid 6603/// redeclaration. Note that this is checking only for the using decl 6604/// itself, not for any ill-formedness among the UsingShadowDecls. 6605bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6606 bool isTypeName, 6607 const CXXScopeSpec &SS, 6608 SourceLocation NameLoc, 6609 const LookupResult &Prev) { 6610 // C++03 [namespace.udecl]p8: 6611 // C++0x [namespace.udecl]p10: 6612 // A using-declaration is a declaration and can therefore be used 6613 // repeatedly where (and only where) multiple declarations are 6614 // allowed. 6615 // 6616 // That's in non-member contexts. 6617 if (!CurContext->getRedeclContext()->isRecord()) 6618 return false; 6619 6620 NestedNameSpecifier *Qual 6621 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6622 6623 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6624 NamedDecl *D = *I; 6625 6626 bool DTypename; 6627 NestedNameSpecifier *DQual; 6628 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6629 DTypename = UD->isTypeName(); 6630 DQual = UD->getQualifier(); 6631 } else if (UnresolvedUsingValueDecl *UD 6632 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6633 DTypename = false; 6634 DQual = UD->getQualifier(); 6635 } else if (UnresolvedUsingTypenameDecl *UD 6636 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6637 DTypename = true; 6638 DQual = UD->getQualifier(); 6639 } else continue; 6640 6641 // using decls differ if one says 'typename' and the other doesn't. 6642 // FIXME: non-dependent using decls? 6643 if (isTypeName != DTypename) continue; 6644 6645 // using decls differ if they name different scopes (but note that 6646 // template instantiation can cause this check to trigger when it 6647 // didn't before instantiation). 6648 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6649 Context.getCanonicalNestedNameSpecifier(DQual)) 6650 continue; 6651 6652 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6653 Diag(D->getLocation(), diag::note_using_decl) << 1; 6654 return true; 6655 } 6656 6657 return false; 6658} 6659 6660 6661/// Checks that the given nested-name qualifier used in a using decl 6662/// in the current context is appropriately related to the current 6663/// scope. If an error is found, diagnoses it and returns true. 6664bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6665 const CXXScopeSpec &SS, 6666 SourceLocation NameLoc) { 6667 DeclContext *NamedContext = computeDeclContext(SS); 6668 6669 if (!CurContext->isRecord()) { 6670 // C++03 [namespace.udecl]p3: 6671 // C++0x [namespace.udecl]p8: 6672 // A using-declaration for a class member shall be a member-declaration. 6673 6674 // If we weren't able to compute a valid scope, it must be a 6675 // dependent class scope. 6676 if (!NamedContext || NamedContext->isRecord()) { 6677 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6678 << SS.getRange(); 6679 return true; 6680 } 6681 6682 // Otherwise, everything is known to be fine. 6683 return false; 6684 } 6685 6686 // The current scope is a record. 6687 6688 // If the named context is dependent, we can't decide much. 6689 if (!NamedContext) { 6690 // FIXME: in C++0x, we can diagnose if we can prove that the 6691 // nested-name-specifier does not refer to a base class, which is 6692 // still possible in some cases. 6693 6694 // Otherwise we have to conservatively report that things might be 6695 // okay. 6696 return false; 6697 } 6698 6699 if (!NamedContext->isRecord()) { 6700 // Ideally this would point at the last name in the specifier, 6701 // but we don't have that level of source info. 6702 Diag(SS.getRange().getBegin(), 6703 diag::err_using_decl_nested_name_specifier_is_not_class) 6704 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6705 return true; 6706 } 6707 6708 if (!NamedContext->isDependentContext() && 6709 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6710 return true; 6711 6712 if (getLangOptions().CPlusPlus0x) { 6713 // C++0x [namespace.udecl]p3: 6714 // In a using-declaration used as a member-declaration, the 6715 // nested-name-specifier shall name a base class of the class 6716 // being defined. 6717 6718 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6719 cast<CXXRecordDecl>(NamedContext))) { 6720 if (CurContext == NamedContext) { 6721 Diag(NameLoc, 6722 diag::err_using_decl_nested_name_specifier_is_current_class) 6723 << SS.getRange(); 6724 return true; 6725 } 6726 6727 Diag(SS.getRange().getBegin(), 6728 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6729 << (NestedNameSpecifier*) SS.getScopeRep() 6730 << cast<CXXRecordDecl>(CurContext) 6731 << SS.getRange(); 6732 return true; 6733 } 6734 6735 return false; 6736 } 6737 6738 // C++03 [namespace.udecl]p4: 6739 // A using-declaration used as a member-declaration shall refer 6740 // to a member of a base class of the class being defined [etc.]. 6741 6742 // Salient point: SS doesn't have to name a base class as long as 6743 // lookup only finds members from base classes. Therefore we can 6744 // diagnose here only if we can prove that that can't happen, 6745 // i.e. if the class hierarchies provably don't intersect. 6746 6747 // TODO: it would be nice if "definitely valid" results were cached 6748 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6749 // need to be repeated. 6750 6751 struct UserData { 6752 llvm::DenseSet<const CXXRecordDecl*> Bases; 6753 6754 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6755 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6756 Data->Bases.insert(Base); 6757 return true; 6758 } 6759 6760 bool hasDependentBases(const CXXRecordDecl *Class) { 6761 return !Class->forallBases(collect, this); 6762 } 6763 6764 /// Returns true if the base is dependent or is one of the 6765 /// accumulated base classes. 6766 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6767 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6768 return !Data->Bases.count(Base); 6769 } 6770 6771 bool mightShareBases(const CXXRecordDecl *Class) { 6772 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6773 } 6774 }; 6775 6776 UserData Data; 6777 6778 // Returns false if we find a dependent base. 6779 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6780 return false; 6781 6782 // Returns false if the class has a dependent base or if it or one 6783 // of its bases is present in the base set of the current context. 6784 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6785 return false; 6786 6787 Diag(SS.getRange().getBegin(), 6788 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6789 << (NestedNameSpecifier*) SS.getScopeRep() 6790 << cast<CXXRecordDecl>(CurContext) 6791 << SS.getRange(); 6792 6793 return true; 6794} 6795 6796Decl *Sema::ActOnAliasDeclaration(Scope *S, 6797 AccessSpecifier AS, 6798 MultiTemplateParamsArg TemplateParamLists, 6799 SourceLocation UsingLoc, 6800 UnqualifiedId &Name, 6801 TypeResult Type) { 6802 // Skip up to the relevant declaration scope. 6803 while (S->getFlags() & Scope::TemplateParamScope) 6804 S = S->getParent(); 6805 assert((S->getFlags() & Scope::DeclScope) && 6806 "got alias-declaration outside of declaration scope"); 6807 6808 if (Type.isInvalid()) 6809 return 0; 6810 6811 bool Invalid = false; 6812 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6813 TypeSourceInfo *TInfo = 0; 6814 GetTypeFromParser(Type.get(), &TInfo); 6815 6816 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6817 return 0; 6818 6819 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6820 UPPC_DeclarationType)) { 6821 Invalid = true; 6822 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6823 TInfo->getTypeLoc().getBeginLoc()); 6824 } 6825 6826 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6827 LookupName(Previous, S); 6828 6829 // Warn about shadowing the name of a template parameter. 6830 if (Previous.isSingleResult() && 6831 Previous.getFoundDecl()->isTemplateParameter()) { 6832 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6833 Previous.clear(); 6834 } 6835 6836 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6837 "name in alias declaration must be an identifier"); 6838 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6839 Name.StartLocation, 6840 Name.Identifier, TInfo); 6841 6842 NewTD->setAccess(AS); 6843 6844 if (Invalid) 6845 NewTD->setInvalidDecl(); 6846 6847 CheckTypedefForVariablyModifiedType(S, NewTD); 6848 Invalid |= NewTD->isInvalidDecl(); 6849 6850 bool Redeclaration = false; 6851 6852 NamedDecl *NewND; 6853 if (TemplateParamLists.size()) { 6854 TypeAliasTemplateDecl *OldDecl = 0; 6855 TemplateParameterList *OldTemplateParams = 0; 6856 6857 if (TemplateParamLists.size() != 1) { 6858 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6859 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6860 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6861 } 6862 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6863 6864 // Only consider previous declarations in the same scope. 6865 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6866 /*ExplicitInstantiationOrSpecialization*/false); 6867 if (!Previous.empty()) { 6868 Redeclaration = true; 6869 6870 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6871 if (!OldDecl && !Invalid) { 6872 Diag(UsingLoc, diag::err_redefinition_different_kind) 6873 << Name.Identifier; 6874 6875 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6876 if (OldD->getLocation().isValid()) 6877 Diag(OldD->getLocation(), diag::note_previous_definition); 6878 6879 Invalid = true; 6880 } 6881 6882 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6883 if (TemplateParameterListsAreEqual(TemplateParams, 6884 OldDecl->getTemplateParameters(), 6885 /*Complain=*/true, 6886 TPL_TemplateMatch)) 6887 OldTemplateParams = OldDecl->getTemplateParameters(); 6888 else 6889 Invalid = true; 6890 6891 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6892 if (!Invalid && 6893 !Context.hasSameType(OldTD->getUnderlyingType(), 6894 NewTD->getUnderlyingType())) { 6895 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6896 // but we can't reasonably accept it. 6897 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6898 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6899 if (OldTD->getLocation().isValid()) 6900 Diag(OldTD->getLocation(), diag::note_previous_definition); 6901 Invalid = true; 6902 } 6903 } 6904 } 6905 6906 // Merge any previous default template arguments into our parameters, 6907 // and check the parameter list. 6908 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6909 TPC_TypeAliasTemplate)) 6910 return 0; 6911 6912 TypeAliasTemplateDecl *NewDecl = 6913 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6914 Name.Identifier, TemplateParams, 6915 NewTD); 6916 6917 NewDecl->setAccess(AS); 6918 6919 if (Invalid) 6920 NewDecl->setInvalidDecl(); 6921 else if (OldDecl) 6922 NewDecl->setPreviousDeclaration(OldDecl); 6923 6924 NewND = NewDecl; 6925 } else { 6926 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6927 NewND = NewTD; 6928 } 6929 6930 if (!Redeclaration) 6931 PushOnScopeChains(NewND, S); 6932 6933 return NewND; 6934} 6935 6936Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6937 SourceLocation NamespaceLoc, 6938 SourceLocation AliasLoc, 6939 IdentifierInfo *Alias, 6940 CXXScopeSpec &SS, 6941 SourceLocation IdentLoc, 6942 IdentifierInfo *Ident) { 6943 6944 // Lookup the namespace name. 6945 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6946 LookupParsedName(R, S, &SS); 6947 6948 // Check if we have a previous declaration with the same name. 6949 NamedDecl *PrevDecl 6950 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6951 ForRedeclaration); 6952 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6953 PrevDecl = 0; 6954 6955 if (PrevDecl) { 6956 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6957 // We already have an alias with the same name that points to the same 6958 // namespace, so don't create a new one. 6959 // FIXME: At some point, we'll want to create the (redundant) 6960 // declaration to maintain better source information. 6961 if (!R.isAmbiguous() && !R.empty() && 6962 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6963 return 0; 6964 } 6965 6966 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6967 diag::err_redefinition_different_kind; 6968 Diag(AliasLoc, DiagID) << Alias; 6969 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6970 return 0; 6971 } 6972 6973 if (R.isAmbiguous()) 6974 return 0; 6975 6976 if (R.empty()) { 6977 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6978 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6979 return 0; 6980 } 6981 } 6982 6983 NamespaceAliasDecl *AliasDecl = 6984 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6985 Alias, SS.getWithLocInContext(Context), 6986 IdentLoc, R.getFoundDecl()); 6987 6988 PushOnScopeChains(AliasDecl, S); 6989 return AliasDecl; 6990} 6991 6992namespace { 6993 /// \brief Scoped object used to handle the state changes required in Sema 6994 /// to implicitly define the body of a C++ member function; 6995 class ImplicitlyDefinedFunctionScope { 6996 Sema &S; 6997 Sema::ContextRAII SavedContext; 6998 6999 public: 7000 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 7001 : S(S), SavedContext(S, Method) 7002 { 7003 S.PushFunctionScope(); 7004 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 7005 } 7006 7007 ~ImplicitlyDefinedFunctionScope() { 7008 S.PopExpressionEvaluationContext(); 7009 S.PopFunctionScopeInfo(); 7010 } 7011 }; 7012} 7013 7014Sema::ImplicitExceptionSpecification 7015Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7016 // C++ [except.spec]p14: 7017 // An implicitly declared special member function (Clause 12) shall have an 7018 // exception-specification. [...] 7019 ImplicitExceptionSpecification ExceptSpec(Context); 7020 if (ClassDecl->isInvalidDecl()) 7021 return ExceptSpec; 7022 7023 // Direct base-class constructors. 7024 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7025 BEnd = ClassDecl->bases_end(); 7026 B != BEnd; ++B) { 7027 if (B->isVirtual()) // Handled below. 7028 continue; 7029 7030 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7031 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7032 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7033 // If this is a deleted function, add it anyway. This might be conformant 7034 // with the standard. This might not. I'm not sure. It might not matter. 7035 if (Constructor) 7036 ExceptSpec.CalledDecl(Constructor); 7037 } 7038 } 7039 7040 // Virtual base-class constructors. 7041 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7042 BEnd = ClassDecl->vbases_end(); 7043 B != BEnd; ++B) { 7044 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7045 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7046 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7047 // If this is a deleted function, add it anyway. This might be conformant 7048 // with the standard. This might not. I'm not sure. It might not matter. 7049 if (Constructor) 7050 ExceptSpec.CalledDecl(Constructor); 7051 } 7052 } 7053 7054 // Field constructors. 7055 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7056 FEnd = ClassDecl->field_end(); 7057 F != FEnd; ++F) { 7058 if (F->hasInClassInitializer()) { 7059 if (Expr *E = F->getInClassInitializer()) 7060 ExceptSpec.CalledExpr(E); 7061 else if (!F->isInvalidDecl()) 7062 ExceptSpec.SetDelayed(); 7063 } else if (const RecordType *RecordTy 7064 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7065 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7066 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7067 // If this is a deleted function, add it anyway. This might be conformant 7068 // with the standard. This might not. I'm not sure. It might not matter. 7069 // In particular, the problem is that this function never gets called. It 7070 // might just be ill-formed because this function attempts to refer to 7071 // a deleted function here. 7072 if (Constructor) 7073 ExceptSpec.CalledDecl(Constructor); 7074 } 7075 } 7076 7077 return ExceptSpec; 7078} 7079 7080CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7081 CXXRecordDecl *ClassDecl) { 7082 // C++ [class.ctor]p5: 7083 // A default constructor for a class X is a constructor of class X 7084 // that can be called without an argument. If there is no 7085 // user-declared constructor for class X, a default constructor is 7086 // implicitly declared. An implicitly-declared default constructor 7087 // is an inline public member of its class. 7088 assert(!ClassDecl->hasUserDeclaredConstructor() && 7089 "Should not build implicit default constructor!"); 7090 7091 ImplicitExceptionSpecification Spec = 7092 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7093 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7094 7095 // Create the actual constructor declaration. 7096 CanQualType ClassType 7097 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7098 SourceLocation ClassLoc = ClassDecl->getLocation(); 7099 DeclarationName Name 7100 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7101 DeclarationNameInfo NameInfo(Name, ClassLoc); 7102 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7103 Context, ClassDecl, ClassLoc, NameInfo, 7104 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 7105 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7106 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 7107 getLangOptions().CPlusPlus0x); 7108 DefaultCon->setAccess(AS_public); 7109 DefaultCon->setDefaulted(); 7110 DefaultCon->setImplicit(); 7111 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7112 7113 // Note that we have declared this constructor. 7114 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7115 7116 if (Scope *S = getScopeForContext(ClassDecl)) 7117 PushOnScopeChains(DefaultCon, S, false); 7118 ClassDecl->addDecl(DefaultCon); 7119 7120 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7121 DefaultCon->setDeletedAsWritten(); 7122 7123 return DefaultCon; 7124} 7125 7126void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7127 CXXConstructorDecl *Constructor) { 7128 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7129 !Constructor->doesThisDeclarationHaveABody() && 7130 !Constructor->isDeleted()) && 7131 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7132 7133 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7134 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7135 7136 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 7137 DiagnosticErrorTrap Trap(Diags); 7138 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7139 Trap.hasErrorOccurred()) { 7140 Diag(CurrentLocation, diag::note_member_synthesized_at) 7141 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7142 Constructor->setInvalidDecl(); 7143 return; 7144 } 7145 7146 SourceLocation Loc = Constructor->getLocation(); 7147 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7148 7149 Constructor->setUsed(); 7150 MarkVTableUsed(CurrentLocation, ClassDecl); 7151 7152 if (ASTMutationListener *L = getASTMutationListener()) { 7153 L->CompletedImplicitDefinition(Constructor); 7154 } 7155} 7156 7157/// Get any existing defaulted default constructor for the given class. Do not 7158/// implicitly define one if it does not exist. 7159static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 7160 CXXRecordDecl *D) { 7161 ASTContext &Context = Self.Context; 7162 QualType ClassType = Context.getTypeDeclType(D); 7163 DeclarationName ConstructorName 7164 = Context.DeclarationNames.getCXXConstructorName( 7165 Context.getCanonicalType(ClassType.getUnqualifiedType())); 7166 7167 DeclContext::lookup_const_iterator Con, ConEnd; 7168 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 7169 Con != ConEnd; ++Con) { 7170 // A function template cannot be defaulted. 7171 if (isa<FunctionTemplateDecl>(*Con)) 7172 continue; 7173 7174 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 7175 if (Constructor->isDefaultConstructor()) 7176 return Constructor->isDefaulted() ? Constructor : 0; 7177 } 7178 return 0; 7179} 7180 7181void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7182 if (!D) return; 7183 AdjustDeclIfTemplate(D); 7184 7185 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7186 CXXConstructorDecl *CtorDecl 7187 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 7188 7189 if (!CtorDecl) return; 7190 7191 // Compute the exception specification for the default constructor. 7192 const FunctionProtoType *CtorTy = 7193 CtorDecl->getType()->castAs<FunctionProtoType>(); 7194 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 7195 ImplicitExceptionSpecification Spec = 7196 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 7197 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7198 assert(EPI.ExceptionSpecType != EST_Delayed); 7199 7200 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7201 } 7202 7203 // If the default constructor is explicitly defaulted, checking the exception 7204 // specification is deferred until now. 7205 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 7206 !ClassDecl->isDependentType()) 7207 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 7208} 7209 7210void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7211 // We start with an initial pass over the base classes to collect those that 7212 // inherit constructors from. If there are none, we can forgo all further 7213 // processing. 7214 typedef SmallVector<const RecordType *, 4> BasesVector; 7215 BasesVector BasesToInheritFrom; 7216 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7217 BaseE = ClassDecl->bases_end(); 7218 BaseIt != BaseE; ++BaseIt) { 7219 if (BaseIt->getInheritConstructors()) { 7220 QualType Base = BaseIt->getType(); 7221 if (Base->isDependentType()) { 7222 // If we inherit constructors from anything that is dependent, just 7223 // abort processing altogether. We'll get another chance for the 7224 // instantiations. 7225 return; 7226 } 7227 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7228 } 7229 } 7230 if (BasesToInheritFrom.empty()) 7231 return; 7232 7233 // Now collect the constructors that we already have in the current class. 7234 // Those take precedence over inherited constructors. 7235 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7236 // unless there is a user-declared constructor with the same signature in 7237 // the class where the using-declaration appears. 7238 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7239 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7240 CtorE = ClassDecl->ctor_end(); 7241 CtorIt != CtorE; ++CtorIt) { 7242 ExistingConstructors.insert( 7243 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7244 } 7245 7246 Scope *S = getScopeForContext(ClassDecl); 7247 DeclarationName CreatedCtorName = 7248 Context.DeclarationNames.getCXXConstructorName( 7249 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7250 7251 // Now comes the true work. 7252 // First, we keep a map from constructor types to the base that introduced 7253 // them. Needed for finding conflicting constructors. We also keep the 7254 // actually inserted declarations in there, for pretty diagnostics. 7255 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7256 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7257 ConstructorToSourceMap InheritedConstructors; 7258 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7259 BaseE = BasesToInheritFrom.end(); 7260 BaseIt != BaseE; ++BaseIt) { 7261 const RecordType *Base = *BaseIt; 7262 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7263 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7264 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7265 CtorE = BaseDecl->ctor_end(); 7266 CtorIt != CtorE; ++CtorIt) { 7267 // Find the using declaration for inheriting this base's constructors. 7268 DeclarationName Name = 7269 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7270 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 7271 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 7272 SourceLocation UsingLoc = UD ? UD->getLocation() : 7273 ClassDecl->getLocation(); 7274 7275 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7276 // from the class X named in the using-declaration consists of actual 7277 // constructors and notional constructors that result from the 7278 // transformation of defaulted parameters as follows: 7279 // - all non-template default constructors of X, and 7280 // - for each non-template constructor of X that has at least one 7281 // parameter with a default argument, the set of constructors that 7282 // results from omitting any ellipsis parameter specification and 7283 // successively omitting parameters with a default argument from the 7284 // end of the parameter-type-list. 7285 CXXConstructorDecl *BaseCtor = *CtorIt; 7286 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7287 const FunctionProtoType *BaseCtorType = 7288 BaseCtor->getType()->getAs<FunctionProtoType>(); 7289 7290 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7291 maxParams = BaseCtor->getNumParams(); 7292 params <= maxParams; ++params) { 7293 // Skip default constructors. They're never inherited. 7294 if (params == 0) 7295 continue; 7296 // Skip copy and move constructors for the same reason. 7297 if (CanBeCopyOrMove && params == 1) 7298 continue; 7299 7300 // Build up a function type for this particular constructor. 7301 // FIXME: The working paper does not consider that the exception spec 7302 // for the inheriting constructor might be larger than that of the 7303 // source. This code doesn't yet, either. When it does, this code will 7304 // need to be delayed until after exception specifications and in-class 7305 // member initializers are attached. 7306 const Type *NewCtorType; 7307 if (params == maxParams) 7308 NewCtorType = BaseCtorType; 7309 else { 7310 SmallVector<QualType, 16> Args; 7311 for (unsigned i = 0; i < params; ++i) { 7312 Args.push_back(BaseCtorType->getArgType(i)); 7313 } 7314 FunctionProtoType::ExtProtoInfo ExtInfo = 7315 BaseCtorType->getExtProtoInfo(); 7316 ExtInfo.Variadic = false; 7317 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7318 Args.data(), params, ExtInfo) 7319 .getTypePtr(); 7320 } 7321 const Type *CanonicalNewCtorType = 7322 Context.getCanonicalType(NewCtorType); 7323 7324 // Now that we have the type, first check if the class already has a 7325 // constructor with this signature. 7326 if (ExistingConstructors.count(CanonicalNewCtorType)) 7327 continue; 7328 7329 // Then we check if we have already declared an inherited constructor 7330 // with this signature. 7331 std::pair<ConstructorToSourceMap::iterator, bool> result = 7332 InheritedConstructors.insert(std::make_pair( 7333 CanonicalNewCtorType, 7334 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7335 if (!result.second) { 7336 // Already in the map. If it came from a different class, that's an 7337 // error. Not if it's from the same. 7338 CanQualType PreviousBase = result.first->second.first; 7339 if (CanonicalBase != PreviousBase) { 7340 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7341 const CXXConstructorDecl *PrevBaseCtor = 7342 PrevCtor->getInheritedConstructor(); 7343 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7344 7345 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7346 Diag(BaseCtor->getLocation(), 7347 diag::note_using_decl_constructor_conflict_current_ctor); 7348 Diag(PrevBaseCtor->getLocation(), 7349 diag::note_using_decl_constructor_conflict_previous_ctor); 7350 Diag(PrevCtor->getLocation(), 7351 diag::note_using_decl_constructor_conflict_previous_using); 7352 } 7353 continue; 7354 } 7355 7356 // OK, we're there, now add the constructor. 7357 // C++0x [class.inhctor]p8: [...] that would be performed by a 7358 // user-written inline constructor [...] 7359 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7360 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7361 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7362 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7363 /*ImplicitlyDeclared=*/true, 7364 // FIXME: Due to a defect in the standard, we treat inherited 7365 // constructors as constexpr even if that makes them ill-formed. 7366 /*Constexpr=*/BaseCtor->isConstexpr()); 7367 NewCtor->setAccess(BaseCtor->getAccess()); 7368 7369 // Build up the parameter decls and add them. 7370 SmallVector<ParmVarDecl *, 16> ParamDecls; 7371 for (unsigned i = 0; i < params; ++i) { 7372 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7373 UsingLoc, UsingLoc, 7374 /*IdentifierInfo=*/0, 7375 BaseCtorType->getArgType(i), 7376 /*TInfo=*/0, SC_None, 7377 SC_None, /*DefaultArg=*/0)); 7378 } 7379 NewCtor->setParams(ParamDecls); 7380 NewCtor->setInheritedConstructor(BaseCtor); 7381 7382 PushOnScopeChains(NewCtor, S, false); 7383 ClassDecl->addDecl(NewCtor); 7384 result.first->second.second = NewCtor; 7385 } 7386 } 7387 } 7388} 7389 7390Sema::ImplicitExceptionSpecification 7391Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7392 // C++ [except.spec]p14: 7393 // An implicitly declared special member function (Clause 12) shall have 7394 // an exception-specification. 7395 ImplicitExceptionSpecification ExceptSpec(Context); 7396 if (ClassDecl->isInvalidDecl()) 7397 return ExceptSpec; 7398 7399 // Direct base-class destructors. 7400 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7401 BEnd = ClassDecl->bases_end(); 7402 B != BEnd; ++B) { 7403 if (B->isVirtual()) // Handled below. 7404 continue; 7405 7406 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7407 ExceptSpec.CalledDecl( 7408 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7409 } 7410 7411 // Virtual base-class destructors. 7412 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7413 BEnd = ClassDecl->vbases_end(); 7414 B != BEnd; ++B) { 7415 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7416 ExceptSpec.CalledDecl( 7417 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7418 } 7419 7420 // Field destructors. 7421 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7422 FEnd = ClassDecl->field_end(); 7423 F != FEnd; ++F) { 7424 if (const RecordType *RecordTy 7425 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7426 ExceptSpec.CalledDecl( 7427 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7428 } 7429 7430 return ExceptSpec; 7431} 7432 7433CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7434 // C++ [class.dtor]p2: 7435 // If a class has no user-declared destructor, a destructor is 7436 // declared implicitly. An implicitly-declared destructor is an 7437 // inline public member of its class. 7438 7439 ImplicitExceptionSpecification Spec = 7440 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7441 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7442 7443 // Create the actual destructor declaration. 7444 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7445 7446 CanQualType ClassType 7447 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7448 SourceLocation ClassLoc = ClassDecl->getLocation(); 7449 DeclarationName Name 7450 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7451 DeclarationNameInfo NameInfo(Name, ClassLoc); 7452 CXXDestructorDecl *Destructor 7453 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7454 /*isInline=*/true, 7455 /*isImplicitlyDeclared=*/true); 7456 Destructor->setAccess(AS_public); 7457 Destructor->setDefaulted(); 7458 Destructor->setImplicit(); 7459 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7460 7461 // Note that we have declared this destructor. 7462 ++ASTContext::NumImplicitDestructorsDeclared; 7463 7464 // Introduce this destructor into its scope. 7465 if (Scope *S = getScopeForContext(ClassDecl)) 7466 PushOnScopeChains(Destructor, S, false); 7467 ClassDecl->addDecl(Destructor); 7468 7469 // This could be uniqued if it ever proves significant. 7470 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7471 7472 if (ShouldDeleteDestructor(Destructor)) 7473 Destructor->setDeletedAsWritten(); 7474 7475 AddOverriddenMethods(ClassDecl, Destructor); 7476 7477 return Destructor; 7478} 7479 7480void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7481 CXXDestructorDecl *Destructor) { 7482 assert((Destructor->isDefaulted() && 7483 !Destructor->doesThisDeclarationHaveABody()) && 7484 "DefineImplicitDestructor - call it for implicit default dtor"); 7485 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7486 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7487 7488 if (Destructor->isInvalidDecl()) 7489 return; 7490 7491 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7492 7493 DiagnosticErrorTrap Trap(Diags); 7494 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7495 Destructor->getParent()); 7496 7497 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7498 Diag(CurrentLocation, diag::note_member_synthesized_at) 7499 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7500 7501 Destructor->setInvalidDecl(); 7502 return; 7503 } 7504 7505 SourceLocation Loc = Destructor->getLocation(); 7506 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7507 Destructor->setImplicitlyDefined(true); 7508 Destructor->setUsed(); 7509 MarkVTableUsed(CurrentLocation, ClassDecl); 7510 7511 if (ASTMutationListener *L = getASTMutationListener()) { 7512 L->CompletedImplicitDefinition(Destructor); 7513 } 7514} 7515 7516void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7517 CXXDestructorDecl *destructor) { 7518 // C++11 [class.dtor]p3: 7519 // A declaration of a destructor that does not have an exception- 7520 // specification is implicitly considered to have the same exception- 7521 // specification as an implicit declaration. 7522 const FunctionProtoType *dtorType = destructor->getType()-> 7523 getAs<FunctionProtoType>(); 7524 if (dtorType->hasExceptionSpec()) 7525 return; 7526 7527 ImplicitExceptionSpecification exceptSpec = 7528 ComputeDefaultedDtorExceptionSpec(classDecl); 7529 7530 // Replace the destructor's type, building off the existing one. Fortunately, 7531 // the only thing of interest in the destructor type is its extended info. 7532 // The return and arguments are fixed. 7533 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7534 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7535 epi.NumExceptions = exceptSpec.size(); 7536 epi.Exceptions = exceptSpec.data(); 7537 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7538 7539 destructor->setType(ty); 7540 7541 // FIXME: If the destructor has a body that could throw, and the newly created 7542 // spec doesn't allow exceptions, we should emit a warning, because this 7543 // change in behavior can break conforming C++03 programs at runtime. 7544 // However, we don't have a body yet, so it needs to be done somewhere else. 7545} 7546 7547/// \brief Builds a statement that copies/moves the given entity from \p From to 7548/// \c To. 7549/// 7550/// This routine is used to copy/move the members of a class with an 7551/// implicitly-declared copy/move assignment operator. When the entities being 7552/// copied are arrays, this routine builds for loops to copy them. 7553/// 7554/// \param S The Sema object used for type-checking. 7555/// 7556/// \param Loc The location where the implicit copy/move is being generated. 7557/// 7558/// \param T The type of the expressions being copied/moved. Both expressions 7559/// must have this type. 7560/// 7561/// \param To The expression we are copying/moving to. 7562/// 7563/// \param From The expression we are copying/moving from. 7564/// 7565/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7566/// Otherwise, it's a non-static member subobject. 7567/// 7568/// \param Copying Whether we're copying or moving. 7569/// 7570/// \param Depth Internal parameter recording the depth of the recursion. 7571/// 7572/// \returns A statement or a loop that copies the expressions. 7573static StmtResult 7574BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7575 Expr *To, Expr *From, 7576 bool CopyingBaseSubobject, bool Copying, 7577 unsigned Depth = 0) { 7578 // C++0x [class.copy]p28: 7579 // Each subobject is assigned in the manner appropriate to its type: 7580 // 7581 // - if the subobject is of class type, as if by a call to operator= with 7582 // the subobject as the object expression and the corresponding 7583 // subobject of x as a single function argument (as if by explicit 7584 // qualification; that is, ignoring any possible virtual overriding 7585 // functions in more derived classes); 7586 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7587 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7588 7589 // Look for operator=. 7590 DeclarationName Name 7591 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7592 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7593 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7594 7595 // Filter out any result that isn't a copy/move-assignment operator. 7596 LookupResult::Filter F = OpLookup.makeFilter(); 7597 while (F.hasNext()) { 7598 NamedDecl *D = F.next(); 7599 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7600 if (Copying ? Method->isCopyAssignmentOperator() : 7601 Method->isMoveAssignmentOperator()) 7602 continue; 7603 7604 F.erase(); 7605 } 7606 F.done(); 7607 7608 // Suppress the protected check (C++ [class.protected]) for each of the 7609 // assignment operators we found. This strange dance is required when 7610 // we're assigning via a base classes's copy-assignment operator. To 7611 // ensure that we're getting the right base class subobject (without 7612 // ambiguities), we need to cast "this" to that subobject type; to 7613 // ensure that we don't go through the virtual call mechanism, we need 7614 // to qualify the operator= name with the base class (see below). However, 7615 // this means that if the base class has a protected copy assignment 7616 // operator, the protected member access check will fail. So, we 7617 // rewrite "protected" access to "public" access in this case, since we 7618 // know by construction that we're calling from a derived class. 7619 if (CopyingBaseSubobject) { 7620 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7621 L != LEnd; ++L) { 7622 if (L.getAccess() == AS_protected) 7623 L.setAccess(AS_public); 7624 } 7625 } 7626 7627 // Create the nested-name-specifier that will be used to qualify the 7628 // reference to operator=; this is required to suppress the virtual 7629 // call mechanism. 7630 CXXScopeSpec SS; 7631 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7632 SS.MakeTrivial(S.Context, 7633 NestedNameSpecifier::Create(S.Context, 0, false, 7634 CanonicalT), 7635 Loc); 7636 7637 // Create the reference to operator=. 7638 ExprResult OpEqualRef 7639 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7640 /*TemplateKWLoc=*/SourceLocation(), 7641 /*FirstQualifierInScope=*/0, 7642 OpLookup, 7643 /*TemplateArgs=*/0, 7644 /*SuppressQualifierCheck=*/true); 7645 if (OpEqualRef.isInvalid()) 7646 return StmtError(); 7647 7648 // Build the call to the assignment operator. 7649 7650 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7651 OpEqualRef.takeAs<Expr>(), 7652 Loc, &From, 1, Loc); 7653 if (Call.isInvalid()) 7654 return StmtError(); 7655 7656 return S.Owned(Call.takeAs<Stmt>()); 7657 } 7658 7659 // - if the subobject is of scalar type, the built-in assignment 7660 // operator is used. 7661 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7662 if (!ArrayTy) { 7663 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7664 if (Assignment.isInvalid()) 7665 return StmtError(); 7666 7667 return S.Owned(Assignment.takeAs<Stmt>()); 7668 } 7669 7670 // - if the subobject is an array, each element is assigned, in the 7671 // manner appropriate to the element type; 7672 7673 // Construct a loop over the array bounds, e.g., 7674 // 7675 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7676 // 7677 // that will copy each of the array elements. 7678 QualType SizeType = S.Context.getSizeType(); 7679 7680 // Create the iteration variable. 7681 IdentifierInfo *IterationVarName = 0; 7682 { 7683 SmallString<8> Str; 7684 llvm::raw_svector_ostream OS(Str); 7685 OS << "__i" << Depth; 7686 IterationVarName = &S.Context.Idents.get(OS.str()); 7687 } 7688 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7689 IterationVarName, SizeType, 7690 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7691 SC_None, SC_None); 7692 7693 // Initialize the iteration variable to zero. 7694 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7695 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7696 7697 // Create a reference to the iteration variable; we'll use this several 7698 // times throughout. 7699 Expr *IterationVarRef 7700 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7701 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7702 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7703 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7704 7705 // Create the DeclStmt that holds the iteration variable. 7706 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7707 7708 // Create the comparison against the array bound. 7709 llvm::APInt Upper 7710 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7711 Expr *Comparison 7712 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7713 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7714 BO_NE, S.Context.BoolTy, 7715 VK_RValue, OK_Ordinary, Loc); 7716 7717 // Create the pre-increment of the iteration variable. 7718 Expr *Increment 7719 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7720 VK_LValue, OK_Ordinary, Loc); 7721 7722 // Subscript the "from" and "to" expressions with the iteration variable. 7723 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7724 IterationVarRefRVal, 7725 Loc)); 7726 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7727 IterationVarRefRVal, 7728 Loc)); 7729 if (!Copying) // Cast to rvalue 7730 From = CastForMoving(S, From); 7731 7732 // Build the copy/move for an individual element of the array. 7733 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7734 To, From, CopyingBaseSubobject, 7735 Copying, Depth + 1); 7736 if (Copy.isInvalid()) 7737 return StmtError(); 7738 7739 // Construct the loop that copies all elements of this array. 7740 return S.ActOnForStmt(Loc, Loc, InitStmt, 7741 S.MakeFullExpr(Comparison), 7742 0, S.MakeFullExpr(Increment), 7743 Loc, Copy.take()); 7744} 7745 7746std::pair<Sema::ImplicitExceptionSpecification, bool> 7747Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7748 CXXRecordDecl *ClassDecl) { 7749 if (ClassDecl->isInvalidDecl()) 7750 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7751 7752 // C++ [class.copy]p10: 7753 // If the class definition does not explicitly declare a copy 7754 // assignment operator, one is declared implicitly. 7755 // The implicitly-defined copy assignment operator for a class X 7756 // will have the form 7757 // 7758 // X& X::operator=(const X&) 7759 // 7760 // if 7761 bool HasConstCopyAssignment = true; 7762 7763 // -- each direct base class B of X has a copy assignment operator 7764 // whose parameter is of type const B&, const volatile B& or B, 7765 // and 7766 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7767 BaseEnd = ClassDecl->bases_end(); 7768 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7769 // We'll handle this below 7770 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7771 continue; 7772 7773 assert(!Base->getType()->isDependentType() && 7774 "Cannot generate implicit members for class with dependent bases."); 7775 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7776 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7777 &HasConstCopyAssignment); 7778 } 7779 7780 // In C++11, the above citation has "or virtual" added 7781 if (LangOpts.CPlusPlus0x) { 7782 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7783 BaseEnd = ClassDecl->vbases_end(); 7784 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7785 assert(!Base->getType()->isDependentType() && 7786 "Cannot generate implicit members for class with dependent bases."); 7787 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7788 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7789 &HasConstCopyAssignment); 7790 } 7791 } 7792 7793 // -- for all the nonstatic data members of X that are of a class 7794 // type M (or array thereof), each such class type has a copy 7795 // assignment operator whose parameter is of type const M&, 7796 // const volatile M& or M. 7797 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7798 FieldEnd = ClassDecl->field_end(); 7799 HasConstCopyAssignment && Field != FieldEnd; 7800 ++Field) { 7801 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7802 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7803 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7804 &HasConstCopyAssignment); 7805 } 7806 } 7807 7808 // Otherwise, the implicitly declared copy assignment operator will 7809 // have the form 7810 // 7811 // X& X::operator=(X&) 7812 7813 // C++ [except.spec]p14: 7814 // An implicitly declared special member function (Clause 12) shall have an 7815 // exception-specification. [...] 7816 7817 // It is unspecified whether or not an implicit copy assignment operator 7818 // attempts to deduplicate calls to assignment operators of virtual bases are 7819 // made. As such, this exception specification is effectively unspecified. 7820 // Based on a similar decision made for constness in C++0x, we're erring on 7821 // the side of assuming such calls to be made regardless of whether they 7822 // actually happen. 7823 ImplicitExceptionSpecification ExceptSpec(Context); 7824 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7825 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7826 BaseEnd = ClassDecl->bases_end(); 7827 Base != BaseEnd; ++Base) { 7828 if (Base->isVirtual()) 7829 continue; 7830 7831 CXXRecordDecl *BaseClassDecl 7832 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7833 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7834 ArgQuals, false, 0)) 7835 ExceptSpec.CalledDecl(CopyAssign); 7836 } 7837 7838 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7839 BaseEnd = ClassDecl->vbases_end(); 7840 Base != BaseEnd; ++Base) { 7841 CXXRecordDecl *BaseClassDecl 7842 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7843 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7844 ArgQuals, false, 0)) 7845 ExceptSpec.CalledDecl(CopyAssign); 7846 } 7847 7848 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7849 FieldEnd = ClassDecl->field_end(); 7850 Field != FieldEnd; 7851 ++Field) { 7852 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7853 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7854 if (CXXMethodDecl *CopyAssign = 7855 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7856 ExceptSpec.CalledDecl(CopyAssign); 7857 } 7858 } 7859 7860 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7861} 7862 7863CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7864 // Note: The following rules are largely analoguous to the copy 7865 // constructor rules. Note that virtual bases are not taken into account 7866 // for determining the argument type of the operator. Note also that 7867 // operators taking an object instead of a reference are allowed. 7868 7869 ImplicitExceptionSpecification Spec(Context); 7870 bool Const; 7871 llvm::tie(Spec, Const) = 7872 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7873 7874 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7875 QualType RetType = Context.getLValueReferenceType(ArgType); 7876 if (Const) 7877 ArgType = ArgType.withConst(); 7878 ArgType = Context.getLValueReferenceType(ArgType); 7879 7880 // An implicitly-declared copy assignment operator is an inline public 7881 // member of its class. 7882 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7883 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7884 SourceLocation ClassLoc = ClassDecl->getLocation(); 7885 DeclarationNameInfo NameInfo(Name, ClassLoc); 7886 CXXMethodDecl *CopyAssignment 7887 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7888 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7889 /*TInfo=*/0, /*isStatic=*/false, 7890 /*StorageClassAsWritten=*/SC_None, 7891 /*isInline=*/true, /*isConstexpr=*/false, 7892 SourceLocation()); 7893 CopyAssignment->setAccess(AS_public); 7894 CopyAssignment->setDefaulted(); 7895 CopyAssignment->setImplicit(); 7896 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7897 7898 // Add the parameter to the operator. 7899 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7900 ClassLoc, ClassLoc, /*Id=*/0, 7901 ArgType, /*TInfo=*/0, 7902 SC_None, 7903 SC_None, 0); 7904 CopyAssignment->setParams(FromParam); 7905 7906 // Note that we have added this copy-assignment operator. 7907 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7908 7909 if (Scope *S = getScopeForContext(ClassDecl)) 7910 PushOnScopeChains(CopyAssignment, S, false); 7911 ClassDecl->addDecl(CopyAssignment); 7912 7913 // C++0x [class.copy]p19: 7914 // .... If the class definition does not explicitly declare a copy 7915 // assignment operator, there is no user-declared move constructor, and 7916 // there is no user-declared move assignment operator, a copy assignment 7917 // operator is implicitly declared as defaulted. 7918 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7919 !getLangOptions().MicrosoftMode) || 7920 ClassDecl->hasUserDeclaredMoveAssignment() || 7921 ShouldDeleteCopyAssignmentOperator(CopyAssignment)) 7922 CopyAssignment->setDeletedAsWritten(); 7923 7924 AddOverriddenMethods(ClassDecl, CopyAssignment); 7925 return CopyAssignment; 7926} 7927 7928void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7929 CXXMethodDecl *CopyAssignOperator) { 7930 assert((CopyAssignOperator->isDefaulted() && 7931 CopyAssignOperator->isOverloadedOperator() && 7932 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7933 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7934 "DefineImplicitCopyAssignment called for wrong function"); 7935 7936 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7937 7938 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7939 CopyAssignOperator->setInvalidDecl(); 7940 return; 7941 } 7942 7943 CopyAssignOperator->setUsed(); 7944 7945 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7946 DiagnosticErrorTrap Trap(Diags); 7947 7948 // C++0x [class.copy]p30: 7949 // The implicitly-defined or explicitly-defaulted copy assignment operator 7950 // for a non-union class X performs memberwise copy assignment of its 7951 // subobjects. The direct base classes of X are assigned first, in the 7952 // order of their declaration in the base-specifier-list, and then the 7953 // immediate non-static data members of X are assigned, in the order in 7954 // which they were declared in the class definition. 7955 7956 // The statements that form the synthesized function body. 7957 ASTOwningVector<Stmt*> Statements(*this); 7958 7959 // The parameter for the "other" object, which we are copying from. 7960 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7961 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7962 QualType OtherRefType = Other->getType(); 7963 if (const LValueReferenceType *OtherRef 7964 = OtherRefType->getAs<LValueReferenceType>()) { 7965 OtherRefType = OtherRef->getPointeeType(); 7966 OtherQuals = OtherRefType.getQualifiers(); 7967 } 7968 7969 // Our location for everything implicitly-generated. 7970 SourceLocation Loc = CopyAssignOperator->getLocation(); 7971 7972 // Construct a reference to the "other" object. We'll be using this 7973 // throughout the generated ASTs. 7974 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7975 assert(OtherRef && "Reference to parameter cannot fail!"); 7976 7977 // Construct the "this" pointer. We'll be using this throughout the generated 7978 // ASTs. 7979 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7980 assert(This && "Reference to this cannot fail!"); 7981 7982 // Assign base classes. 7983 bool Invalid = false; 7984 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7985 E = ClassDecl->bases_end(); Base != E; ++Base) { 7986 // Form the assignment: 7987 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7988 QualType BaseType = Base->getType().getUnqualifiedType(); 7989 if (!BaseType->isRecordType()) { 7990 Invalid = true; 7991 continue; 7992 } 7993 7994 CXXCastPath BasePath; 7995 BasePath.push_back(Base); 7996 7997 // Construct the "from" expression, which is an implicit cast to the 7998 // appropriately-qualified base type. 7999 Expr *From = OtherRef; 8000 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 8001 CK_UncheckedDerivedToBase, 8002 VK_LValue, &BasePath).take(); 8003 8004 // Dereference "this". 8005 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8006 8007 // Implicitly cast "this" to the appropriately-qualified base type. 8008 To = ImpCastExprToType(To.take(), 8009 Context.getCVRQualifiedType(BaseType, 8010 CopyAssignOperator->getTypeQualifiers()), 8011 CK_UncheckedDerivedToBase, 8012 VK_LValue, &BasePath); 8013 8014 // Build the copy. 8015 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 8016 To.get(), From, 8017 /*CopyingBaseSubobject=*/true, 8018 /*Copying=*/true); 8019 if (Copy.isInvalid()) { 8020 Diag(CurrentLocation, diag::note_member_synthesized_at) 8021 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8022 CopyAssignOperator->setInvalidDecl(); 8023 return; 8024 } 8025 8026 // Success! Record the copy. 8027 Statements.push_back(Copy.takeAs<Expr>()); 8028 } 8029 8030 // \brief Reference to the __builtin_memcpy function. 8031 Expr *BuiltinMemCpyRef = 0; 8032 // \brief Reference to the __builtin_objc_memmove_collectable function. 8033 Expr *CollectableMemCpyRef = 0; 8034 8035 // Assign non-static members. 8036 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8037 FieldEnd = ClassDecl->field_end(); 8038 Field != FieldEnd; ++Field) { 8039 if (Field->isUnnamedBitfield()) 8040 continue; 8041 8042 // Check for members of reference type; we can't copy those. 8043 if (Field->getType()->isReferenceType()) { 8044 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8045 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8046 Diag(Field->getLocation(), diag::note_declared_at); 8047 Diag(CurrentLocation, diag::note_member_synthesized_at) 8048 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8049 Invalid = true; 8050 continue; 8051 } 8052 8053 // Check for members of const-qualified, non-class type. 8054 QualType BaseType = Context.getBaseElementType(Field->getType()); 8055 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8056 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8057 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8058 Diag(Field->getLocation(), diag::note_declared_at); 8059 Diag(CurrentLocation, diag::note_member_synthesized_at) 8060 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8061 Invalid = true; 8062 continue; 8063 } 8064 8065 // Suppress assigning zero-width bitfields. 8066 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8067 continue; 8068 8069 QualType FieldType = Field->getType().getNonReferenceType(); 8070 if (FieldType->isIncompleteArrayType()) { 8071 assert(ClassDecl->hasFlexibleArrayMember() && 8072 "Incomplete array type is not valid"); 8073 continue; 8074 } 8075 8076 // Build references to the field in the object we're copying from and to. 8077 CXXScopeSpec SS; // Intentionally empty 8078 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8079 LookupMemberName); 8080 MemberLookup.addDecl(*Field); 8081 MemberLookup.resolveKind(); 8082 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8083 Loc, /*IsArrow=*/false, 8084 SS, SourceLocation(), 0, 8085 MemberLookup, 0); 8086 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8087 Loc, /*IsArrow=*/true, 8088 SS, SourceLocation(), 0, 8089 MemberLookup, 0); 8090 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8091 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8092 8093 // If the field should be copied with __builtin_memcpy rather than via 8094 // explicit assignments, do so. This optimization only applies for arrays 8095 // of scalars and arrays of class type with trivial copy-assignment 8096 // operators. 8097 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8098 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 8099 // Compute the size of the memory buffer to be copied. 8100 QualType SizeType = Context.getSizeType(); 8101 llvm::APInt Size(Context.getTypeSize(SizeType), 8102 Context.getTypeSizeInChars(BaseType).getQuantity()); 8103 for (const ConstantArrayType *Array 8104 = Context.getAsConstantArrayType(FieldType); 8105 Array; 8106 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8107 llvm::APInt ArraySize 8108 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8109 Size *= ArraySize; 8110 } 8111 8112 // Take the address of the field references for "from" and "to". 8113 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 8114 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 8115 8116 bool NeedsCollectableMemCpy = 8117 (BaseType->isRecordType() && 8118 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8119 8120 if (NeedsCollectableMemCpy) { 8121 if (!CollectableMemCpyRef) { 8122 // Create a reference to the __builtin_objc_memmove_collectable function. 8123 LookupResult R(*this, 8124 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8125 Loc, LookupOrdinaryName); 8126 LookupName(R, TUScope, true); 8127 8128 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8129 if (!CollectableMemCpy) { 8130 // Something went horribly wrong earlier, and we will have 8131 // complained about it. 8132 Invalid = true; 8133 continue; 8134 } 8135 8136 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8137 CollectableMemCpy->getType(), 8138 VK_LValue, Loc, 0).take(); 8139 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8140 } 8141 } 8142 // Create a reference to the __builtin_memcpy builtin function. 8143 else if (!BuiltinMemCpyRef) { 8144 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8145 LookupOrdinaryName); 8146 LookupName(R, TUScope, true); 8147 8148 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8149 if (!BuiltinMemCpy) { 8150 // Something went horribly wrong earlier, and we will have complained 8151 // about it. 8152 Invalid = true; 8153 continue; 8154 } 8155 8156 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8157 BuiltinMemCpy->getType(), 8158 VK_LValue, Loc, 0).take(); 8159 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8160 } 8161 8162 ASTOwningVector<Expr*> CallArgs(*this); 8163 CallArgs.push_back(To.takeAs<Expr>()); 8164 CallArgs.push_back(From.takeAs<Expr>()); 8165 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8166 ExprResult Call = ExprError(); 8167 if (NeedsCollectableMemCpy) 8168 Call = ActOnCallExpr(/*Scope=*/0, 8169 CollectableMemCpyRef, 8170 Loc, move_arg(CallArgs), 8171 Loc); 8172 else 8173 Call = ActOnCallExpr(/*Scope=*/0, 8174 BuiltinMemCpyRef, 8175 Loc, move_arg(CallArgs), 8176 Loc); 8177 8178 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8179 Statements.push_back(Call.takeAs<Expr>()); 8180 continue; 8181 } 8182 8183 // Build the copy of this field. 8184 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 8185 To.get(), From.get(), 8186 /*CopyingBaseSubobject=*/false, 8187 /*Copying=*/true); 8188 if (Copy.isInvalid()) { 8189 Diag(CurrentLocation, diag::note_member_synthesized_at) 8190 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8191 CopyAssignOperator->setInvalidDecl(); 8192 return; 8193 } 8194 8195 // Success! Record the copy. 8196 Statements.push_back(Copy.takeAs<Stmt>()); 8197 } 8198 8199 if (!Invalid) { 8200 // Add a "return *this;" 8201 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8202 8203 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8204 if (Return.isInvalid()) 8205 Invalid = true; 8206 else { 8207 Statements.push_back(Return.takeAs<Stmt>()); 8208 8209 if (Trap.hasErrorOccurred()) { 8210 Diag(CurrentLocation, diag::note_member_synthesized_at) 8211 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8212 Invalid = true; 8213 } 8214 } 8215 } 8216 8217 if (Invalid) { 8218 CopyAssignOperator->setInvalidDecl(); 8219 return; 8220 } 8221 8222 StmtResult Body; 8223 { 8224 CompoundScopeRAII CompoundScope(*this); 8225 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8226 /*isStmtExpr=*/false); 8227 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8228 } 8229 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8230 8231 if (ASTMutationListener *L = getASTMutationListener()) { 8232 L->CompletedImplicitDefinition(CopyAssignOperator); 8233 } 8234} 8235 8236Sema::ImplicitExceptionSpecification 8237Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 8238 ImplicitExceptionSpecification ExceptSpec(Context); 8239 8240 if (ClassDecl->isInvalidDecl()) 8241 return ExceptSpec; 8242 8243 // C++0x [except.spec]p14: 8244 // An implicitly declared special member function (Clause 12) shall have an 8245 // exception-specification. [...] 8246 8247 // It is unspecified whether or not an implicit move assignment operator 8248 // attempts to deduplicate calls to assignment operators of virtual bases are 8249 // made. As such, this exception specification is effectively unspecified. 8250 // Based on a similar decision made for constness in C++0x, we're erring on 8251 // the side of assuming such calls to be made regardless of whether they 8252 // actually happen. 8253 // Note that a move constructor is not implicitly declared when there are 8254 // virtual bases, but it can still be user-declared and explicitly defaulted. 8255 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8256 BaseEnd = ClassDecl->bases_end(); 8257 Base != BaseEnd; ++Base) { 8258 if (Base->isVirtual()) 8259 continue; 8260 8261 CXXRecordDecl *BaseClassDecl 8262 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8263 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8264 false, 0)) 8265 ExceptSpec.CalledDecl(MoveAssign); 8266 } 8267 8268 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8269 BaseEnd = ClassDecl->vbases_end(); 8270 Base != BaseEnd; ++Base) { 8271 CXXRecordDecl *BaseClassDecl 8272 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8273 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8274 false, 0)) 8275 ExceptSpec.CalledDecl(MoveAssign); 8276 } 8277 8278 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8279 FieldEnd = ClassDecl->field_end(); 8280 Field != FieldEnd; 8281 ++Field) { 8282 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8283 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8284 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 8285 false, 0)) 8286 ExceptSpec.CalledDecl(MoveAssign); 8287 } 8288 } 8289 8290 return ExceptSpec; 8291} 8292 8293CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8294 // Note: The following rules are largely analoguous to the move 8295 // constructor rules. 8296 8297 ImplicitExceptionSpecification Spec( 8298 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8299 8300 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8301 QualType RetType = Context.getLValueReferenceType(ArgType); 8302 ArgType = Context.getRValueReferenceType(ArgType); 8303 8304 // An implicitly-declared move assignment operator is an inline public 8305 // member of its class. 8306 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8307 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8308 SourceLocation ClassLoc = ClassDecl->getLocation(); 8309 DeclarationNameInfo NameInfo(Name, ClassLoc); 8310 CXXMethodDecl *MoveAssignment 8311 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8312 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8313 /*TInfo=*/0, /*isStatic=*/false, 8314 /*StorageClassAsWritten=*/SC_None, 8315 /*isInline=*/true, 8316 /*isConstexpr=*/false, 8317 SourceLocation()); 8318 MoveAssignment->setAccess(AS_public); 8319 MoveAssignment->setDefaulted(); 8320 MoveAssignment->setImplicit(); 8321 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8322 8323 // Add the parameter to the operator. 8324 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8325 ClassLoc, ClassLoc, /*Id=*/0, 8326 ArgType, /*TInfo=*/0, 8327 SC_None, 8328 SC_None, 0); 8329 MoveAssignment->setParams(FromParam); 8330 8331 // Note that we have added this copy-assignment operator. 8332 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8333 8334 // C++0x [class.copy]p9: 8335 // If the definition of a class X does not explicitly declare a move 8336 // assignment operator, one will be implicitly declared as defaulted if and 8337 // only if: 8338 // [...] 8339 // - the move assignment operator would not be implicitly defined as 8340 // deleted. 8341 if (ShouldDeleteMoveAssignmentOperator(MoveAssignment)) { 8342 // Cache this result so that we don't try to generate this over and over 8343 // on every lookup, leaking memory and wasting time. 8344 ClassDecl->setFailedImplicitMoveAssignment(); 8345 return 0; 8346 } 8347 8348 if (Scope *S = getScopeForContext(ClassDecl)) 8349 PushOnScopeChains(MoveAssignment, S, false); 8350 ClassDecl->addDecl(MoveAssignment); 8351 8352 AddOverriddenMethods(ClassDecl, MoveAssignment); 8353 return MoveAssignment; 8354} 8355 8356void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8357 CXXMethodDecl *MoveAssignOperator) { 8358 assert((MoveAssignOperator->isDefaulted() && 8359 MoveAssignOperator->isOverloadedOperator() && 8360 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8361 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8362 "DefineImplicitMoveAssignment called for wrong function"); 8363 8364 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8365 8366 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8367 MoveAssignOperator->setInvalidDecl(); 8368 return; 8369 } 8370 8371 MoveAssignOperator->setUsed(); 8372 8373 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8374 DiagnosticErrorTrap Trap(Diags); 8375 8376 // C++0x [class.copy]p28: 8377 // The implicitly-defined or move assignment operator for a non-union class 8378 // X performs memberwise move assignment of its subobjects. The direct base 8379 // classes of X are assigned first, in the order of their declaration in the 8380 // base-specifier-list, and then the immediate non-static data members of X 8381 // are assigned, in the order in which they were declared in the class 8382 // definition. 8383 8384 // The statements that form the synthesized function body. 8385 ASTOwningVector<Stmt*> Statements(*this); 8386 8387 // The parameter for the "other" object, which we are move from. 8388 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8389 QualType OtherRefType = Other->getType()-> 8390 getAs<RValueReferenceType>()->getPointeeType(); 8391 assert(OtherRefType.getQualifiers() == 0 && 8392 "Bad argument type of defaulted move assignment"); 8393 8394 // Our location for everything implicitly-generated. 8395 SourceLocation Loc = MoveAssignOperator->getLocation(); 8396 8397 // Construct a reference to the "other" object. We'll be using this 8398 // throughout the generated ASTs. 8399 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8400 assert(OtherRef && "Reference to parameter cannot fail!"); 8401 // Cast to rvalue. 8402 OtherRef = CastForMoving(*this, OtherRef); 8403 8404 // Construct the "this" pointer. We'll be using this throughout the generated 8405 // ASTs. 8406 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8407 assert(This && "Reference to this cannot fail!"); 8408 8409 // Assign base classes. 8410 bool Invalid = false; 8411 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8412 E = ClassDecl->bases_end(); Base != E; ++Base) { 8413 // Form the assignment: 8414 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8415 QualType BaseType = Base->getType().getUnqualifiedType(); 8416 if (!BaseType->isRecordType()) { 8417 Invalid = true; 8418 continue; 8419 } 8420 8421 CXXCastPath BasePath; 8422 BasePath.push_back(Base); 8423 8424 // Construct the "from" expression, which is an implicit cast to the 8425 // appropriately-qualified base type. 8426 Expr *From = OtherRef; 8427 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8428 VK_XValue, &BasePath).take(); 8429 8430 // Dereference "this". 8431 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8432 8433 // Implicitly cast "this" to the appropriately-qualified base type. 8434 To = ImpCastExprToType(To.take(), 8435 Context.getCVRQualifiedType(BaseType, 8436 MoveAssignOperator->getTypeQualifiers()), 8437 CK_UncheckedDerivedToBase, 8438 VK_LValue, &BasePath); 8439 8440 // Build the move. 8441 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8442 To.get(), From, 8443 /*CopyingBaseSubobject=*/true, 8444 /*Copying=*/false); 8445 if (Move.isInvalid()) { 8446 Diag(CurrentLocation, diag::note_member_synthesized_at) 8447 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8448 MoveAssignOperator->setInvalidDecl(); 8449 return; 8450 } 8451 8452 // Success! Record the move. 8453 Statements.push_back(Move.takeAs<Expr>()); 8454 } 8455 8456 // \brief Reference to the __builtin_memcpy function. 8457 Expr *BuiltinMemCpyRef = 0; 8458 // \brief Reference to the __builtin_objc_memmove_collectable function. 8459 Expr *CollectableMemCpyRef = 0; 8460 8461 // Assign non-static members. 8462 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8463 FieldEnd = ClassDecl->field_end(); 8464 Field != FieldEnd; ++Field) { 8465 if (Field->isUnnamedBitfield()) 8466 continue; 8467 8468 // Check for members of reference type; we can't move those. 8469 if (Field->getType()->isReferenceType()) { 8470 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8471 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8472 Diag(Field->getLocation(), diag::note_declared_at); 8473 Diag(CurrentLocation, diag::note_member_synthesized_at) 8474 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8475 Invalid = true; 8476 continue; 8477 } 8478 8479 // Check for members of const-qualified, non-class type. 8480 QualType BaseType = Context.getBaseElementType(Field->getType()); 8481 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8482 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8483 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8484 Diag(Field->getLocation(), diag::note_declared_at); 8485 Diag(CurrentLocation, diag::note_member_synthesized_at) 8486 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8487 Invalid = true; 8488 continue; 8489 } 8490 8491 // Suppress assigning zero-width bitfields. 8492 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8493 continue; 8494 8495 QualType FieldType = Field->getType().getNonReferenceType(); 8496 if (FieldType->isIncompleteArrayType()) { 8497 assert(ClassDecl->hasFlexibleArrayMember() && 8498 "Incomplete array type is not valid"); 8499 continue; 8500 } 8501 8502 // Build references to the field in the object we're copying from and to. 8503 CXXScopeSpec SS; // Intentionally empty 8504 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8505 LookupMemberName); 8506 MemberLookup.addDecl(*Field); 8507 MemberLookup.resolveKind(); 8508 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8509 Loc, /*IsArrow=*/false, 8510 SS, SourceLocation(), 0, 8511 MemberLookup, 0); 8512 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8513 Loc, /*IsArrow=*/true, 8514 SS, SourceLocation(), 0, 8515 MemberLookup, 0); 8516 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8517 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8518 8519 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8520 "Member reference with rvalue base must be rvalue except for reference " 8521 "members, which aren't allowed for move assignment."); 8522 8523 // If the field should be copied with __builtin_memcpy rather than via 8524 // explicit assignments, do so. This optimization only applies for arrays 8525 // of scalars and arrays of class type with trivial move-assignment 8526 // operators. 8527 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8528 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8529 // Compute the size of the memory buffer to be copied. 8530 QualType SizeType = Context.getSizeType(); 8531 llvm::APInt Size(Context.getTypeSize(SizeType), 8532 Context.getTypeSizeInChars(BaseType).getQuantity()); 8533 for (const ConstantArrayType *Array 8534 = Context.getAsConstantArrayType(FieldType); 8535 Array; 8536 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8537 llvm::APInt ArraySize 8538 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8539 Size *= ArraySize; 8540 } 8541 8542 // Take the address of the field references for "from" and "to". We 8543 // directly construct UnaryOperators here because semantic analysis 8544 // does not permit us to take the address of an xvalue. 8545 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8546 Context.getPointerType(From.get()->getType()), 8547 VK_RValue, OK_Ordinary, Loc); 8548 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8549 Context.getPointerType(To.get()->getType()), 8550 VK_RValue, OK_Ordinary, Loc); 8551 8552 bool NeedsCollectableMemCpy = 8553 (BaseType->isRecordType() && 8554 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8555 8556 if (NeedsCollectableMemCpy) { 8557 if (!CollectableMemCpyRef) { 8558 // Create a reference to the __builtin_objc_memmove_collectable function. 8559 LookupResult R(*this, 8560 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8561 Loc, LookupOrdinaryName); 8562 LookupName(R, TUScope, true); 8563 8564 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8565 if (!CollectableMemCpy) { 8566 // Something went horribly wrong earlier, and we will have 8567 // complained about it. 8568 Invalid = true; 8569 continue; 8570 } 8571 8572 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8573 CollectableMemCpy->getType(), 8574 VK_LValue, Loc, 0).take(); 8575 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8576 } 8577 } 8578 // Create a reference to the __builtin_memcpy builtin function. 8579 else if (!BuiltinMemCpyRef) { 8580 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8581 LookupOrdinaryName); 8582 LookupName(R, TUScope, true); 8583 8584 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8585 if (!BuiltinMemCpy) { 8586 // Something went horribly wrong earlier, and we will have complained 8587 // about it. 8588 Invalid = true; 8589 continue; 8590 } 8591 8592 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8593 BuiltinMemCpy->getType(), 8594 VK_LValue, Loc, 0).take(); 8595 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8596 } 8597 8598 ASTOwningVector<Expr*> CallArgs(*this); 8599 CallArgs.push_back(To.takeAs<Expr>()); 8600 CallArgs.push_back(From.takeAs<Expr>()); 8601 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8602 ExprResult Call = ExprError(); 8603 if (NeedsCollectableMemCpy) 8604 Call = ActOnCallExpr(/*Scope=*/0, 8605 CollectableMemCpyRef, 8606 Loc, move_arg(CallArgs), 8607 Loc); 8608 else 8609 Call = ActOnCallExpr(/*Scope=*/0, 8610 BuiltinMemCpyRef, 8611 Loc, move_arg(CallArgs), 8612 Loc); 8613 8614 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8615 Statements.push_back(Call.takeAs<Expr>()); 8616 continue; 8617 } 8618 8619 // Build the move of this field. 8620 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8621 To.get(), From.get(), 8622 /*CopyingBaseSubobject=*/false, 8623 /*Copying=*/false); 8624 if (Move.isInvalid()) { 8625 Diag(CurrentLocation, diag::note_member_synthesized_at) 8626 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8627 MoveAssignOperator->setInvalidDecl(); 8628 return; 8629 } 8630 8631 // Success! Record the copy. 8632 Statements.push_back(Move.takeAs<Stmt>()); 8633 } 8634 8635 if (!Invalid) { 8636 // Add a "return *this;" 8637 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8638 8639 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8640 if (Return.isInvalid()) 8641 Invalid = true; 8642 else { 8643 Statements.push_back(Return.takeAs<Stmt>()); 8644 8645 if (Trap.hasErrorOccurred()) { 8646 Diag(CurrentLocation, diag::note_member_synthesized_at) 8647 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8648 Invalid = true; 8649 } 8650 } 8651 } 8652 8653 if (Invalid) { 8654 MoveAssignOperator->setInvalidDecl(); 8655 return; 8656 } 8657 8658 StmtResult Body; 8659 { 8660 CompoundScopeRAII CompoundScope(*this); 8661 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8662 /*isStmtExpr=*/false); 8663 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8664 } 8665 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8666 8667 if (ASTMutationListener *L = getASTMutationListener()) { 8668 L->CompletedImplicitDefinition(MoveAssignOperator); 8669 } 8670} 8671 8672std::pair<Sema::ImplicitExceptionSpecification, bool> 8673Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8674 if (ClassDecl->isInvalidDecl()) 8675 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8676 8677 // C++ [class.copy]p5: 8678 // The implicitly-declared copy constructor for a class X will 8679 // have the form 8680 // 8681 // X::X(const X&) 8682 // 8683 // if 8684 // FIXME: It ought to be possible to store this on the record. 8685 bool HasConstCopyConstructor = true; 8686 8687 // -- each direct or virtual base class B of X has a copy 8688 // constructor whose first parameter is of type const B& or 8689 // const volatile B&, and 8690 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8691 BaseEnd = ClassDecl->bases_end(); 8692 HasConstCopyConstructor && Base != BaseEnd; 8693 ++Base) { 8694 // Virtual bases are handled below. 8695 if (Base->isVirtual()) 8696 continue; 8697 8698 CXXRecordDecl *BaseClassDecl 8699 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8700 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8701 &HasConstCopyConstructor); 8702 } 8703 8704 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8705 BaseEnd = ClassDecl->vbases_end(); 8706 HasConstCopyConstructor && Base != BaseEnd; 8707 ++Base) { 8708 CXXRecordDecl *BaseClassDecl 8709 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8710 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8711 &HasConstCopyConstructor); 8712 } 8713 8714 // -- for all the nonstatic data members of X that are of a 8715 // class type M (or array thereof), each such class type 8716 // has a copy constructor whose first parameter is of type 8717 // const M& or const volatile M&. 8718 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8719 FieldEnd = ClassDecl->field_end(); 8720 HasConstCopyConstructor && Field != FieldEnd; 8721 ++Field) { 8722 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8723 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8724 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8725 &HasConstCopyConstructor); 8726 } 8727 } 8728 // Otherwise, the implicitly declared copy constructor will have 8729 // the form 8730 // 8731 // X::X(X&) 8732 8733 // C++ [except.spec]p14: 8734 // An implicitly declared special member function (Clause 12) shall have an 8735 // exception-specification. [...] 8736 ImplicitExceptionSpecification ExceptSpec(Context); 8737 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8738 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8739 BaseEnd = ClassDecl->bases_end(); 8740 Base != BaseEnd; 8741 ++Base) { 8742 // Virtual bases are handled below. 8743 if (Base->isVirtual()) 8744 continue; 8745 8746 CXXRecordDecl *BaseClassDecl 8747 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8748 if (CXXConstructorDecl *CopyConstructor = 8749 LookupCopyingConstructor(BaseClassDecl, Quals)) 8750 ExceptSpec.CalledDecl(CopyConstructor); 8751 } 8752 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8753 BaseEnd = ClassDecl->vbases_end(); 8754 Base != BaseEnd; 8755 ++Base) { 8756 CXXRecordDecl *BaseClassDecl 8757 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8758 if (CXXConstructorDecl *CopyConstructor = 8759 LookupCopyingConstructor(BaseClassDecl, Quals)) 8760 ExceptSpec.CalledDecl(CopyConstructor); 8761 } 8762 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8763 FieldEnd = ClassDecl->field_end(); 8764 Field != FieldEnd; 8765 ++Field) { 8766 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8767 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8768 if (CXXConstructorDecl *CopyConstructor = 8769 LookupCopyingConstructor(FieldClassDecl, Quals)) 8770 ExceptSpec.CalledDecl(CopyConstructor); 8771 } 8772 } 8773 8774 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8775} 8776 8777CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8778 CXXRecordDecl *ClassDecl) { 8779 // C++ [class.copy]p4: 8780 // If the class definition does not explicitly declare a copy 8781 // constructor, one is declared implicitly. 8782 8783 ImplicitExceptionSpecification Spec(Context); 8784 bool Const; 8785 llvm::tie(Spec, Const) = 8786 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8787 8788 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8789 QualType ArgType = ClassType; 8790 if (Const) 8791 ArgType = ArgType.withConst(); 8792 ArgType = Context.getLValueReferenceType(ArgType); 8793 8794 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8795 8796 DeclarationName Name 8797 = Context.DeclarationNames.getCXXConstructorName( 8798 Context.getCanonicalType(ClassType)); 8799 SourceLocation ClassLoc = ClassDecl->getLocation(); 8800 DeclarationNameInfo NameInfo(Name, ClassLoc); 8801 8802 // An implicitly-declared copy constructor is an inline public 8803 // member of its class. 8804 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8805 Context, ClassDecl, ClassLoc, NameInfo, 8806 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8807 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8808 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8809 getLangOptions().CPlusPlus0x); 8810 CopyConstructor->setAccess(AS_public); 8811 CopyConstructor->setDefaulted(); 8812 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8813 8814 // Note that we have declared this constructor. 8815 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8816 8817 // Add the parameter to the constructor. 8818 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8819 ClassLoc, ClassLoc, 8820 /*IdentifierInfo=*/0, 8821 ArgType, /*TInfo=*/0, 8822 SC_None, 8823 SC_None, 0); 8824 CopyConstructor->setParams(FromParam); 8825 8826 if (Scope *S = getScopeForContext(ClassDecl)) 8827 PushOnScopeChains(CopyConstructor, S, false); 8828 ClassDecl->addDecl(CopyConstructor); 8829 8830 // C++11 [class.copy]p8: 8831 // ... If the class definition does not explicitly declare a copy 8832 // constructor, there is no user-declared move constructor, and there is no 8833 // user-declared move assignment operator, a copy constructor is implicitly 8834 // declared as defaulted. 8835 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8836 (ClassDecl->hasUserDeclaredMoveAssignment() && 8837 !getLangOptions().MicrosoftMode) || 8838 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8839 CopyConstructor->setDeletedAsWritten(); 8840 8841 return CopyConstructor; 8842} 8843 8844void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8845 CXXConstructorDecl *CopyConstructor) { 8846 assert((CopyConstructor->isDefaulted() && 8847 CopyConstructor->isCopyConstructor() && 8848 !CopyConstructor->doesThisDeclarationHaveABody()) && 8849 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8850 8851 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8852 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8853 8854 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8855 DiagnosticErrorTrap Trap(Diags); 8856 8857 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8858 Trap.hasErrorOccurred()) { 8859 Diag(CurrentLocation, diag::note_member_synthesized_at) 8860 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8861 CopyConstructor->setInvalidDecl(); 8862 } else { 8863 Sema::CompoundScopeRAII CompoundScope(*this); 8864 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8865 CopyConstructor->getLocation(), 8866 MultiStmtArg(*this, 0, 0), 8867 /*isStmtExpr=*/false) 8868 .takeAs<Stmt>()); 8869 CopyConstructor->setImplicitlyDefined(true); 8870 } 8871 8872 CopyConstructor->setUsed(); 8873 if (ASTMutationListener *L = getASTMutationListener()) { 8874 L->CompletedImplicitDefinition(CopyConstructor); 8875 } 8876} 8877 8878Sema::ImplicitExceptionSpecification 8879Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8880 // C++ [except.spec]p14: 8881 // An implicitly declared special member function (Clause 12) shall have an 8882 // exception-specification. [...] 8883 ImplicitExceptionSpecification ExceptSpec(Context); 8884 if (ClassDecl->isInvalidDecl()) 8885 return ExceptSpec; 8886 8887 // Direct base-class constructors. 8888 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8889 BEnd = ClassDecl->bases_end(); 8890 B != BEnd; ++B) { 8891 if (B->isVirtual()) // Handled below. 8892 continue; 8893 8894 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8895 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8896 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8897 // If this is a deleted function, add it anyway. This might be conformant 8898 // with the standard. This might not. I'm not sure. It might not matter. 8899 if (Constructor) 8900 ExceptSpec.CalledDecl(Constructor); 8901 } 8902 } 8903 8904 // Virtual base-class constructors. 8905 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8906 BEnd = ClassDecl->vbases_end(); 8907 B != BEnd; ++B) { 8908 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8909 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8910 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8911 // If this is a deleted function, add it anyway. This might be conformant 8912 // with the standard. This might not. I'm not sure. It might not matter. 8913 if (Constructor) 8914 ExceptSpec.CalledDecl(Constructor); 8915 } 8916 } 8917 8918 // Field constructors. 8919 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8920 FEnd = ClassDecl->field_end(); 8921 F != FEnd; ++F) { 8922 if (const RecordType *RecordTy 8923 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8924 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8925 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8926 // If this is a deleted function, add it anyway. This might be conformant 8927 // with the standard. This might not. I'm not sure. It might not matter. 8928 // In particular, the problem is that this function never gets called. It 8929 // might just be ill-formed because this function attempts to refer to 8930 // a deleted function here. 8931 if (Constructor) 8932 ExceptSpec.CalledDecl(Constructor); 8933 } 8934 } 8935 8936 return ExceptSpec; 8937} 8938 8939CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8940 CXXRecordDecl *ClassDecl) { 8941 ImplicitExceptionSpecification Spec( 8942 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8943 8944 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8945 QualType ArgType = Context.getRValueReferenceType(ClassType); 8946 8947 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8948 8949 DeclarationName Name 8950 = Context.DeclarationNames.getCXXConstructorName( 8951 Context.getCanonicalType(ClassType)); 8952 SourceLocation ClassLoc = ClassDecl->getLocation(); 8953 DeclarationNameInfo NameInfo(Name, ClassLoc); 8954 8955 // C++0x [class.copy]p11: 8956 // An implicitly-declared copy/move constructor is an inline public 8957 // member of its class. 8958 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8959 Context, ClassDecl, ClassLoc, NameInfo, 8960 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8961 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8962 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8963 getLangOptions().CPlusPlus0x); 8964 MoveConstructor->setAccess(AS_public); 8965 MoveConstructor->setDefaulted(); 8966 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8967 8968 // Add the parameter to the constructor. 8969 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8970 ClassLoc, ClassLoc, 8971 /*IdentifierInfo=*/0, 8972 ArgType, /*TInfo=*/0, 8973 SC_None, 8974 SC_None, 0); 8975 MoveConstructor->setParams(FromParam); 8976 8977 // C++0x [class.copy]p9: 8978 // If the definition of a class X does not explicitly declare a move 8979 // constructor, one will be implicitly declared as defaulted if and only if: 8980 // [...] 8981 // - the move constructor would not be implicitly defined as deleted. 8982 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8983 // Cache this result so that we don't try to generate this over and over 8984 // on every lookup, leaking memory and wasting time. 8985 ClassDecl->setFailedImplicitMoveConstructor(); 8986 return 0; 8987 } 8988 8989 // Note that we have declared this constructor. 8990 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8991 8992 if (Scope *S = getScopeForContext(ClassDecl)) 8993 PushOnScopeChains(MoveConstructor, S, false); 8994 ClassDecl->addDecl(MoveConstructor); 8995 8996 return MoveConstructor; 8997} 8998 8999void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9000 CXXConstructorDecl *MoveConstructor) { 9001 assert((MoveConstructor->isDefaulted() && 9002 MoveConstructor->isMoveConstructor() && 9003 !MoveConstructor->doesThisDeclarationHaveABody()) && 9004 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9005 9006 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9007 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9008 9009 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 9010 DiagnosticErrorTrap Trap(Diags); 9011 9012 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 9013 Trap.hasErrorOccurred()) { 9014 Diag(CurrentLocation, diag::note_member_synthesized_at) 9015 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9016 MoveConstructor->setInvalidDecl(); 9017 } else { 9018 Sema::CompoundScopeRAII CompoundScope(*this); 9019 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9020 MoveConstructor->getLocation(), 9021 MultiStmtArg(*this, 0, 0), 9022 /*isStmtExpr=*/false) 9023 .takeAs<Stmt>()); 9024 MoveConstructor->setImplicitlyDefined(true); 9025 } 9026 9027 MoveConstructor->setUsed(); 9028 9029 if (ASTMutationListener *L = getASTMutationListener()) { 9030 L->CompletedImplicitDefinition(MoveConstructor); 9031 } 9032} 9033 9034ExprResult 9035Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9036 CXXConstructorDecl *Constructor, 9037 MultiExprArg ExprArgs, 9038 bool HadMultipleCandidates, 9039 bool RequiresZeroInit, 9040 unsigned ConstructKind, 9041 SourceRange ParenRange) { 9042 bool Elidable = false; 9043 9044 // C++0x [class.copy]p34: 9045 // When certain criteria are met, an implementation is allowed to 9046 // omit the copy/move construction of a class object, even if the 9047 // copy/move constructor and/or destructor for the object have 9048 // side effects. [...] 9049 // - when a temporary class object that has not been bound to a 9050 // reference (12.2) would be copied/moved to a class object 9051 // with the same cv-unqualified type, the copy/move operation 9052 // can be omitted by constructing the temporary object 9053 // directly into the target of the omitted copy/move 9054 if (ConstructKind == CXXConstructExpr::CK_Complete && 9055 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 9056 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9057 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9058 } 9059 9060 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9061 Elidable, move(ExprArgs), HadMultipleCandidates, 9062 RequiresZeroInit, ConstructKind, ParenRange); 9063} 9064 9065/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9066/// including handling of its default argument expressions. 9067ExprResult 9068Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9069 CXXConstructorDecl *Constructor, bool Elidable, 9070 MultiExprArg ExprArgs, 9071 bool HadMultipleCandidates, 9072 bool RequiresZeroInit, 9073 unsigned ConstructKind, 9074 SourceRange ParenRange) { 9075 unsigned NumExprs = ExprArgs.size(); 9076 Expr **Exprs = (Expr **)ExprArgs.release(); 9077 9078 for (specific_attr_iterator<NonNullAttr> 9079 i = Constructor->specific_attr_begin<NonNullAttr>(), 9080 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9081 const NonNullAttr *NonNull = *i; 9082 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9083 } 9084 9085 MarkFunctionReferenced(ConstructLoc, Constructor); 9086 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9087 Constructor, Elidable, Exprs, NumExprs, 9088 HadMultipleCandidates, /*FIXME*/false, 9089 RequiresZeroInit, 9090 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9091 ParenRange)); 9092} 9093 9094bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9095 CXXConstructorDecl *Constructor, 9096 MultiExprArg Exprs, 9097 bool HadMultipleCandidates) { 9098 // FIXME: Provide the correct paren SourceRange when available. 9099 ExprResult TempResult = 9100 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9101 move(Exprs), HadMultipleCandidates, false, 9102 CXXConstructExpr::CK_Complete, SourceRange()); 9103 if (TempResult.isInvalid()) 9104 return true; 9105 9106 Expr *Temp = TempResult.takeAs<Expr>(); 9107 CheckImplicitConversions(Temp, VD->getLocation()); 9108 MarkFunctionReferenced(VD->getLocation(), Constructor); 9109 Temp = MaybeCreateExprWithCleanups(Temp); 9110 VD->setInit(Temp); 9111 9112 return false; 9113} 9114 9115void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9116 if (VD->isInvalidDecl()) return; 9117 9118 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9119 if (ClassDecl->isInvalidDecl()) return; 9120 if (ClassDecl->hasTrivialDestructor()) return; 9121 if (ClassDecl->isDependentContext()) return; 9122 9123 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9124 MarkFunctionReferenced(VD->getLocation(), Destructor); 9125 CheckDestructorAccess(VD->getLocation(), Destructor, 9126 PDiag(diag::err_access_dtor_var) 9127 << VD->getDeclName() 9128 << VD->getType()); 9129 9130 if (!VD->hasGlobalStorage()) return; 9131 9132 // Emit warning for non-trivial dtor in global scope (a real global, 9133 // class-static, function-static). 9134 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9135 9136 // TODO: this should be re-enabled for static locals by !CXAAtExit 9137 if (!VD->isStaticLocal()) 9138 Diag(VD->getLocation(), diag::warn_global_destructor); 9139} 9140 9141/// \brief Given a constructor and the set of arguments provided for the 9142/// constructor, convert the arguments and add any required default arguments 9143/// to form a proper call to this constructor. 9144/// 9145/// \returns true if an error occurred, false otherwise. 9146bool 9147Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9148 MultiExprArg ArgsPtr, 9149 SourceLocation Loc, 9150 ASTOwningVector<Expr*> &ConvertedArgs) { 9151 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9152 unsigned NumArgs = ArgsPtr.size(); 9153 Expr **Args = (Expr **)ArgsPtr.get(); 9154 9155 const FunctionProtoType *Proto 9156 = Constructor->getType()->getAs<FunctionProtoType>(); 9157 assert(Proto && "Constructor without a prototype?"); 9158 unsigned NumArgsInProto = Proto->getNumArgs(); 9159 9160 // If too few arguments are available, we'll fill in the rest with defaults. 9161 if (NumArgs < NumArgsInProto) 9162 ConvertedArgs.reserve(NumArgsInProto); 9163 else 9164 ConvertedArgs.reserve(NumArgs); 9165 9166 VariadicCallType CallType = 9167 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9168 SmallVector<Expr *, 8> AllArgs; 9169 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9170 Proto, 0, Args, NumArgs, AllArgs, 9171 CallType); 9172 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9173 return Invalid; 9174} 9175 9176static inline bool 9177CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9178 const FunctionDecl *FnDecl) { 9179 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9180 if (isa<NamespaceDecl>(DC)) { 9181 return SemaRef.Diag(FnDecl->getLocation(), 9182 diag::err_operator_new_delete_declared_in_namespace) 9183 << FnDecl->getDeclName(); 9184 } 9185 9186 if (isa<TranslationUnitDecl>(DC) && 9187 FnDecl->getStorageClass() == SC_Static) { 9188 return SemaRef.Diag(FnDecl->getLocation(), 9189 diag::err_operator_new_delete_declared_static) 9190 << FnDecl->getDeclName(); 9191 } 9192 9193 return false; 9194} 9195 9196static inline bool 9197CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9198 CanQualType ExpectedResultType, 9199 CanQualType ExpectedFirstParamType, 9200 unsigned DependentParamTypeDiag, 9201 unsigned InvalidParamTypeDiag) { 9202 QualType ResultType = 9203 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9204 9205 // Check that the result type is not dependent. 9206 if (ResultType->isDependentType()) 9207 return SemaRef.Diag(FnDecl->getLocation(), 9208 diag::err_operator_new_delete_dependent_result_type) 9209 << FnDecl->getDeclName() << ExpectedResultType; 9210 9211 // Check that the result type is what we expect. 9212 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9213 return SemaRef.Diag(FnDecl->getLocation(), 9214 diag::err_operator_new_delete_invalid_result_type) 9215 << FnDecl->getDeclName() << ExpectedResultType; 9216 9217 // A function template must have at least 2 parameters. 9218 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9219 return SemaRef.Diag(FnDecl->getLocation(), 9220 diag::err_operator_new_delete_template_too_few_parameters) 9221 << FnDecl->getDeclName(); 9222 9223 // The function decl must have at least 1 parameter. 9224 if (FnDecl->getNumParams() == 0) 9225 return SemaRef.Diag(FnDecl->getLocation(), 9226 diag::err_operator_new_delete_too_few_parameters) 9227 << FnDecl->getDeclName(); 9228 9229 // Check the the first parameter type is not dependent. 9230 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9231 if (FirstParamType->isDependentType()) 9232 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9233 << FnDecl->getDeclName() << ExpectedFirstParamType; 9234 9235 // Check that the first parameter type is what we expect. 9236 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9237 ExpectedFirstParamType) 9238 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9239 << FnDecl->getDeclName() << ExpectedFirstParamType; 9240 9241 return false; 9242} 9243 9244static bool 9245CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9246 // C++ [basic.stc.dynamic.allocation]p1: 9247 // A program is ill-formed if an allocation function is declared in a 9248 // namespace scope other than global scope or declared static in global 9249 // scope. 9250 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9251 return true; 9252 9253 CanQualType SizeTy = 9254 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9255 9256 // C++ [basic.stc.dynamic.allocation]p1: 9257 // The return type shall be void*. The first parameter shall have type 9258 // std::size_t. 9259 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9260 SizeTy, 9261 diag::err_operator_new_dependent_param_type, 9262 diag::err_operator_new_param_type)) 9263 return true; 9264 9265 // C++ [basic.stc.dynamic.allocation]p1: 9266 // The first parameter shall not have an associated default argument. 9267 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9268 return SemaRef.Diag(FnDecl->getLocation(), 9269 diag::err_operator_new_default_arg) 9270 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9271 9272 return false; 9273} 9274 9275static bool 9276CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9277 // C++ [basic.stc.dynamic.deallocation]p1: 9278 // A program is ill-formed if deallocation functions are declared in a 9279 // namespace scope other than global scope or declared static in global 9280 // scope. 9281 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9282 return true; 9283 9284 // C++ [basic.stc.dynamic.deallocation]p2: 9285 // Each deallocation function shall return void and its first parameter 9286 // shall be void*. 9287 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9288 SemaRef.Context.VoidPtrTy, 9289 diag::err_operator_delete_dependent_param_type, 9290 diag::err_operator_delete_param_type)) 9291 return true; 9292 9293 return false; 9294} 9295 9296/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9297/// of this overloaded operator is well-formed. If so, returns false; 9298/// otherwise, emits appropriate diagnostics and returns true. 9299bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9300 assert(FnDecl && FnDecl->isOverloadedOperator() && 9301 "Expected an overloaded operator declaration"); 9302 9303 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9304 9305 // C++ [over.oper]p5: 9306 // The allocation and deallocation functions, operator new, 9307 // operator new[], operator delete and operator delete[], are 9308 // described completely in 3.7.3. The attributes and restrictions 9309 // found in the rest of this subclause do not apply to them unless 9310 // explicitly stated in 3.7.3. 9311 if (Op == OO_Delete || Op == OO_Array_Delete) 9312 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9313 9314 if (Op == OO_New || Op == OO_Array_New) 9315 return CheckOperatorNewDeclaration(*this, FnDecl); 9316 9317 // C++ [over.oper]p6: 9318 // An operator function shall either be a non-static member 9319 // function or be a non-member function and have at least one 9320 // parameter whose type is a class, a reference to a class, an 9321 // enumeration, or a reference to an enumeration. 9322 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9323 if (MethodDecl->isStatic()) 9324 return Diag(FnDecl->getLocation(), 9325 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9326 } else { 9327 bool ClassOrEnumParam = false; 9328 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9329 ParamEnd = FnDecl->param_end(); 9330 Param != ParamEnd; ++Param) { 9331 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9332 if (ParamType->isDependentType() || ParamType->isRecordType() || 9333 ParamType->isEnumeralType()) { 9334 ClassOrEnumParam = true; 9335 break; 9336 } 9337 } 9338 9339 if (!ClassOrEnumParam) 9340 return Diag(FnDecl->getLocation(), 9341 diag::err_operator_overload_needs_class_or_enum) 9342 << FnDecl->getDeclName(); 9343 } 9344 9345 // C++ [over.oper]p8: 9346 // An operator function cannot have default arguments (8.3.6), 9347 // except where explicitly stated below. 9348 // 9349 // Only the function-call operator allows default arguments 9350 // (C++ [over.call]p1). 9351 if (Op != OO_Call) { 9352 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9353 Param != FnDecl->param_end(); ++Param) { 9354 if ((*Param)->hasDefaultArg()) 9355 return Diag((*Param)->getLocation(), 9356 diag::err_operator_overload_default_arg) 9357 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9358 } 9359 } 9360 9361 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9362 { false, false, false } 9363#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9364 , { Unary, Binary, MemberOnly } 9365#include "clang/Basic/OperatorKinds.def" 9366 }; 9367 9368 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9369 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9370 bool MustBeMemberOperator = OperatorUses[Op][2]; 9371 9372 // C++ [over.oper]p8: 9373 // [...] Operator functions cannot have more or fewer parameters 9374 // than the number required for the corresponding operator, as 9375 // described in the rest of this subclause. 9376 unsigned NumParams = FnDecl->getNumParams() 9377 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9378 if (Op != OO_Call && 9379 ((NumParams == 1 && !CanBeUnaryOperator) || 9380 (NumParams == 2 && !CanBeBinaryOperator) || 9381 (NumParams < 1) || (NumParams > 2))) { 9382 // We have the wrong number of parameters. 9383 unsigned ErrorKind; 9384 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9385 ErrorKind = 2; // 2 -> unary or binary. 9386 } else if (CanBeUnaryOperator) { 9387 ErrorKind = 0; // 0 -> unary 9388 } else { 9389 assert(CanBeBinaryOperator && 9390 "All non-call overloaded operators are unary or binary!"); 9391 ErrorKind = 1; // 1 -> binary 9392 } 9393 9394 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9395 << FnDecl->getDeclName() << NumParams << ErrorKind; 9396 } 9397 9398 // Overloaded operators other than operator() cannot be variadic. 9399 if (Op != OO_Call && 9400 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9401 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9402 << FnDecl->getDeclName(); 9403 } 9404 9405 // Some operators must be non-static member functions. 9406 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9407 return Diag(FnDecl->getLocation(), 9408 diag::err_operator_overload_must_be_member) 9409 << FnDecl->getDeclName(); 9410 } 9411 9412 // C++ [over.inc]p1: 9413 // The user-defined function called operator++ implements the 9414 // prefix and postfix ++ operator. If this function is a member 9415 // function with no parameters, or a non-member function with one 9416 // parameter of class or enumeration type, it defines the prefix 9417 // increment operator ++ for objects of that type. If the function 9418 // is a member function with one parameter (which shall be of type 9419 // int) or a non-member function with two parameters (the second 9420 // of which shall be of type int), it defines the postfix 9421 // increment operator ++ for objects of that type. 9422 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9423 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9424 bool ParamIsInt = false; 9425 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9426 ParamIsInt = BT->getKind() == BuiltinType::Int; 9427 9428 if (!ParamIsInt) 9429 return Diag(LastParam->getLocation(), 9430 diag::err_operator_overload_post_incdec_must_be_int) 9431 << LastParam->getType() << (Op == OO_MinusMinus); 9432 } 9433 9434 return false; 9435} 9436 9437/// CheckLiteralOperatorDeclaration - Check whether the declaration 9438/// of this literal operator function is well-formed. If so, returns 9439/// false; otherwise, emits appropriate diagnostics and returns true. 9440bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9441 DeclContext *DC = FnDecl->getDeclContext(); 9442 Decl::Kind Kind = DC->getDeclKind(); 9443 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9444 Kind != Decl::LinkageSpec) { 9445 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9446 << FnDecl->getDeclName(); 9447 return true; 9448 } 9449 9450 bool Valid = false; 9451 9452 // template <char...> type operator "" name() is the only valid template 9453 // signature, and the only valid signature with no parameters. 9454 if (FnDecl->param_size() == 0) { 9455 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9456 // Must have only one template parameter 9457 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9458 if (Params->size() == 1) { 9459 NonTypeTemplateParmDecl *PmDecl = 9460 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9461 9462 // The template parameter must be a char parameter pack. 9463 if (PmDecl && PmDecl->isTemplateParameterPack() && 9464 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9465 Valid = true; 9466 } 9467 } 9468 } else { 9469 // Check the first parameter 9470 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9471 9472 QualType T = (*Param)->getType(); 9473 9474 // unsigned long long int, long double, and any character type are allowed 9475 // as the only parameters. 9476 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9477 Context.hasSameType(T, Context.LongDoubleTy) || 9478 Context.hasSameType(T, Context.CharTy) || 9479 Context.hasSameType(T, Context.WCharTy) || 9480 Context.hasSameType(T, Context.Char16Ty) || 9481 Context.hasSameType(T, Context.Char32Ty)) { 9482 if (++Param == FnDecl->param_end()) 9483 Valid = true; 9484 goto FinishedParams; 9485 } 9486 9487 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9488 const PointerType *PT = T->getAs<PointerType>(); 9489 if (!PT) 9490 goto FinishedParams; 9491 T = PT->getPointeeType(); 9492 if (!T.isConstQualified()) 9493 goto FinishedParams; 9494 T = T.getUnqualifiedType(); 9495 9496 // Move on to the second parameter; 9497 ++Param; 9498 9499 // If there is no second parameter, the first must be a const char * 9500 if (Param == FnDecl->param_end()) { 9501 if (Context.hasSameType(T, Context.CharTy)) 9502 Valid = true; 9503 goto FinishedParams; 9504 } 9505 9506 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9507 // are allowed as the first parameter to a two-parameter function 9508 if (!(Context.hasSameType(T, Context.CharTy) || 9509 Context.hasSameType(T, Context.WCharTy) || 9510 Context.hasSameType(T, Context.Char16Ty) || 9511 Context.hasSameType(T, Context.Char32Ty))) 9512 goto FinishedParams; 9513 9514 // The second and final parameter must be an std::size_t 9515 T = (*Param)->getType().getUnqualifiedType(); 9516 if (Context.hasSameType(T, Context.getSizeType()) && 9517 ++Param == FnDecl->param_end()) 9518 Valid = true; 9519 } 9520 9521 // FIXME: This diagnostic is absolutely terrible. 9522FinishedParams: 9523 if (!Valid) { 9524 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9525 << FnDecl->getDeclName(); 9526 return true; 9527 } 9528 9529 StringRef LiteralName 9530 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9531 if (LiteralName[0] != '_') { 9532 // C++0x [usrlit.suffix]p1: 9533 // Literal suffix identifiers that do not start with an underscore are 9534 // reserved for future standardization. 9535 bool IsHexFloat = true; 9536 if (LiteralName.size() > 1 && 9537 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9538 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9539 if (!isdigit(LiteralName[I])) { 9540 IsHexFloat = false; 9541 break; 9542 } 9543 } 9544 } 9545 9546 if (IsHexFloat) 9547 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9548 << LiteralName; 9549 else 9550 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9551 } 9552 9553 return false; 9554} 9555 9556/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9557/// linkage specification, including the language and (if present) 9558/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9559/// the location of the language string literal, which is provided 9560/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9561/// the '{' brace. Otherwise, this linkage specification does not 9562/// have any braces. 9563Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9564 SourceLocation LangLoc, 9565 StringRef Lang, 9566 SourceLocation LBraceLoc) { 9567 LinkageSpecDecl::LanguageIDs Language; 9568 if (Lang == "\"C\"") 9569 Language = LinkageSpecDecl::lang_c; 9570 else if (Lang == "\"C++\"") 9571 Language = LinkageSpecDecl::lang_cxx; 9572 else { 9573 Diag(LangLoc, diag::err_bad_language); 9574 return 0; 9575 } 9576 9577 // FIXME: Add all the various semantics of linkage specifications 9578 9579 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9580 ExternLoc, LangLoc, Language); 9581 CurContext->addDecl(D); 9582 PushDeclContext(S, D); 9583 return D; 9584} 9585 9586/// ActOnFinishLinkageSpecification - Complete the definition of 9587/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9588/// valid, it's the position of the closing '}' brace in a linkage 9589/// specification that uses braces. 9590Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9591 Decl *LinkageSpec, 9592 SourceLocation RBraceLoc) { 9593 if (LinkageSpec) { 9594 if (RBraceLoc.isValid()) { 9595 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9596 LSDecl->setRBraceLoc(RBraceLoc); 9597 } 9598 PopDeclContext(); 9599 } 9600 return LinkageSpec; 9601} 9602 9603/// \brief Perform semantic analysis for the variable declaration that 9604/// occurs within a C++ catch clause, returning the newly-created 9605/// variable. 9606VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9607 TypeSourceInfo *TInfo, 9608 SourceLocation StartLoc, 9609 SourceLocation Loc, 9610 IdentifierInfo *Name) { 9611 bool Invalid = false; 9612 QualType ExDeclType = TInfo->getType(); 9613 9614 // Arrays and functions decay. 9615 if (ExDeclType->isArrayType()) 9616 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9617 else if (ExDeclType->isFunctionType()) 9618 ExDeclType = Context.getPointerType(ExDeclType); 9619 9620 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9621 // The exception-declaration shall not denote a pointer or reference to an 9622 // incomplete type, other than [cv] void*. 9623 // N2844 forbids rvalue references. 9624 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9625 Diag(Loc, diag::err_catch_rvalue_ref); 9626 Invalid = true; 9627 } 9628 9629 QualType BaseType = ExDeclType; 9630 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9631 unsigned DK = diag::err_catch_incomplete; 9632 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9633 BaseType = Ptr->getPointeeType(); 9634 Mode = 1; 9635 DK = diag::err_catch_incomplete_ptr; 9636 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9637 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9638 BaseType = Ref->getPointeeType(); 9639 Mode = 2; 9640 DK = diag::err_catch_incomplete_ref; 9641 } 9642 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9643 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9644 Invalid = true; 9645 9646 if (!Invalid && !ExDeclType->isDependentType() && 9647 RequireNonAbstractType(Loc, ExDeclType, 9648 diag::err_abstract_type_in_decl, 9649 AbstractVariableType)) 9650 Invalid = true; 9651 9652 // Only the non-fragile NeXT runtime currently supports C++ catches 9653 // of ObjC types, and no runtime supports catching ObjC types by value. 9654 if (!Invalid && getLangOptions().ObjC1) { 9655 QualType T = ExDeclType; 9656 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9657 T = RT->getPointeeType(); 9658 9659 if (T->isObjCObjectType()) { 9660 Diag(Loc, diag::err_objc_object_catch); 9661 Invalid = true; 9662 } else if (T->isObjCObjectPointerType()) { 9663 if (!getLangOptions().ObjCNonFragileABI) 9664 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9665 } 9666 } 9667 9668 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9669 ExDeclType, TInfo, SC_None, SC_None); 9670 ExDecl->setExceptionVariable(true); 9671 9672 // In ARC, infer 'retaining' for variables of retainable type. 9673 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9674 Invalid = true; 9675 9676 if (!Invalid && !ExDeclType->isDependentType()) { 9677 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9678 // C++ [except.handle]p16: 9679 // The object declared in an exception-declaration or, if the 9680 // exception-declaration does not specify a name, a temporary (12.2) is 9681 // copy-initialized (8.5) from the exception object. [...] 9682 // The object is destroyed when the handler exits, after the destruction 9683 // of any automatic objects initialized within the handler. 9684 // 9685 // We just pretend to initialize the object with itself, then make sure 9686 // it can be destroyed later. 9687 QualType initType = ExDeclType; 9688 9689 InitializedEntity entity = 9690 InitializedEntity::InitializeVariable(ExDecl); 9691 InitializationKind initKind = 9692 InitializationKind::CreateCopy(Loc, SourceLocation()); 9693 9694 Expr *opaqueValue = 9695 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9696 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9697 ExprResult result = sequence.Perform(*this, entity, initKind, 9698 MultiExprArg(&opaqueValue, 1)); 9699 if (result.isInvalid()) 9700 Invalid = true; 9701 else { 9702 // If the constructor used was non-trivial, set this as the 9703 // "initializer". 9704 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9705 if (!construct->getConstructor()->isTrivial()) { 9706 Expr *init = MaybeCreateExprWithCleanups(construct); 9707 ExDecl->setInit(init); 9708 } 9709 9710 // And make sure it's destructable. 9711 FinalizeVarWithDestructor(ExDecl, recordType); 9712 } 9713 } 9714 } 9715 9716 if (Invalid) 9717 ExDecl->setInvalidDecl(); 9718 9719 return ExDecl; 9720} 9721 9722/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9723/// handler. 9724Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9725 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9726 bool Invalid = D.isInvalidType(); 9727 9728 // Check for unexpanded parameter packs. 9729 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9730 UPPC_ExceptionType)) { 9731 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9732 D.getIdentifierLoc()); 9733 Invalid = true; 9734 } 9735 9736 IdentifierInfo *II = D.getIdentifier(); 9737 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9738 LookupOrdinaryName, 9739 ForRedeclaration)) { 9740 // The scope should be freshly made just for us. There is just no way 9741 // it contains any previous declaration. 9742 assert(!S->isDeclScope(PrevDecl)); 9743 if (PrevDecl->isTemplateParameter()) { 9744 // Maybe we will complain about the shadowed template parameter. 9745 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9746 PrevDecl = 0; 9747 } 9748 } 9749 9750 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9751 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9752 << D.getCXXScopeSpec().getRange(); 9753 Invalid = true; 9754 } 9755 9756 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9757 D.getSourceRange().getBegin(), 9758 D.getIdentifierLoc(), 9759 D.getIdentifier()); 9760 if (Invalid) 9761 ExDecl->setInvalidDecl(); 9762 9763 // Add the exception declaration into this scope. 9764 if (II) 9765 PushOnScopeChains(ExDecl, S); 9766 else 9767 CurContext->addDecl(ExDecl); 9768 9769 ProcessDeclAttributes(S, ExDecl, D); 9770 return ExDecl; 9771} 9772 9773Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9774 Expr *AssertExpr, 9775 Expr *AssertMessageExpr_, 9776 SourceLocation RParenLoc) { 9777 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9778 9779 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9780 // In a static_assert-declaration, the constant-expression shall be a 9781 // constant expression that can be contextually converted to bool. 9782 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9783 if (Converted.isInvalid()) 9784 return 0; 9785 9786 llvm::APSInt Cond; 9787 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9788 PDiag(diag::err_static_assert_expression_is_not_constant), 9789 /*AllowFold=*/false).isInvalid()) 9790 return 0; 9791 9792 if (!Cond) 9793 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9794 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9795 } 9796 9797 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9798 return 0; 9799 9800 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9801 AssertExpr, AssertMessage, RParenLoc); 9802 9803 CurContext->addDecl(Decl); 9804 return Decl; 9805} 9806 9807/// \brief Perform semantic analysis of the given friend type declaration. 9808/// 9809/// \returns A friend declaration that. 9810FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9811 SourceLocation FriendLoc, 9812 TypeSourceInfo *TSInfo) { 9813 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9814 9815 QualType T = TSInfo->getType(); 9816 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9817 9818 // C++03 [class.friend]p2: 9819 // An elaborated-type-specifier shall be used in a friend declaration 9820 // for a class.* 9821 // 9822 // * The class-key of the elaborated-type-specifier is required. 9823 if (!ActiveTemplateInstantiations.empty()) { 9824 // Do not complain about the form of friend template types during 9825 // template instantiation; we will already have complained when the 9826 // template was declared. 9827 } else if (!T->isElaboratedTypeSpecifier()) { 9828 // If we evaluated the type to a record type, suggest putting 9829 // a tag in front. 9830 if (const RecordType *RT = T->getAs<RecordType>()) { 9831 RecordDecl *RD = RT->getDecl(); 9832 9833 std::string InsertionText = std::string(" ") + RD->getKindName(); 9834 9835 Diag(TypeRange.getBegin(), 9836 getLangOptions().CPlusPlus0x ? 9837 diag::warn_cxx98_compat_unelaborated_friend_type : 9838 diag::ext_unelaborated_friend_type) 9839 << (unsigned) RD->getTagKind() 9840 << T 9841 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9842 InsertionText); 9843 } else { 9844 Diag(FriendLoc, 9845 getLangOptions().CPlusPlus0x ? 9846 diag::warn_cxx98_compat_nonclass_type_friend : 9847 diag::ext_nonclass_type_friend) 9848 << T 9849 << SourceRange(FriendLoc, TypeRange.getEnd()); 9850 } 9851 } else if (T->getAs<EnumType>()) { 9852 Diag(FriendLoc, 9853 getLangOptions().CPlusPlus0x ? 9854 diag::warn_cxx98_compat_enum_friend : 9855 diag::ext_enum_friend) 9856 << T 9857 << SourceRange(FriendLoc, TypeRange.getEnd()); 9858 } 9859 9860 // C++0x [class.friend]p3: 9861 // If the type specifier in a friend declaration designates a (possibly 9862 // cv-qualified) class type, that class is declared as a friend; otherwise, 9863 // the friend declaration is ignored. 9864 9865 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9866 // in [class.friend]p3 that we do not implement. 9867 9868 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9869} 9870 9871/// Handle a friend tag declaration where the scope specifier was 9872/// templated. 9873Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9874 unsigned TagSpec, SourceLocation TagLoc, 9875 CXXScopeSpec &SS, 9876 IdentifierInfo *Name, SourceLocation NameLoc, 9877 AttributeList *Attr, 9878 MultiTemplateParamsArg TempParamLists) { 9879 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9880 9881 bool isExplicitSpecialization = false; 9882 bool Invalid = false; 9883 9884 if (TemplateParameterList *TemplateParams 9885 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9886 TempParamLists.get(), 9887 TempParamLists.size(), 9888 /*friend*/ true, 9889 isExplicitSpecialization, 9890 Invalid)) { 9891 if (TemplateParams->size() > 0) { 9892 // This is a declaration of a class template. 9893 if (Invalid) 9894 return 0; 9895 9896 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9897 SS, Name, NameLoc, Attr, 9898 TemplateParams, AS_public, 9899 /*ModulePrivateLoc=*/SourceLocation(), 9900 TempParamLists.size() - 1, 9901 (TemplateParameterList**) TempParamLists.release()).take(); 9902 } else { 9903 // The "template<>" header is extraneous. 9904 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9905 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9906 isExplicitSpecialization = true; 9907 } 9908 } 9909 9910 if (Invalid) return 0; 9911 9912 bool isAllExplicitSpecializations = true; 9913 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9914 if (TempParamLists.get()[I]->size()) { 9915 isAllExplicitSpecializations = false; 9916 break; 9917 } 9918 } 9919 9920 // FIXME: don't ignore attributes. 9921 9922 // If it's explicit specializations all the way down, just forget 9923 // about the template header and build an appropriate non-templated 9924 // friend. TODO: for source fidelity, remember the headers. 9925 if (isAllExplicitSpecializations) { 9926 if (SS.isEmpty()) { 9927 bool Owned = false; 9928 bool IsDependent = false; 9929 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9930 Attr, AS_public, 9931 /*ModulePrivateLoc=*/SourceLocation(), 9932 MultiTemplateParamsArg(), Owned, IsDependent, 9933 /*ScopedEnumKWLoc=*/SourceLocation(), 9934 /*ScopedEnumUsesClassTag=*/false, 9935 /*UnderlyingType=*/TypeResult()); 9936 } 9937 9938 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9939 ElaboratedTypeKeyword Keyword 9940 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9941 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9942 *Name, NameLoc); 9943 if (T.isNull()) 9944 return 0; 9945 9946 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9947 if (isa<DependentNameType>(T)) { 9948 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9949 TL.setElaboratedKeywordLoc(TagLoc); 9950 TL.setQualifierLoc(QualifierLoc); 9951 TL.setNameLoc(NameLoc); 9952 } else { 9953 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9954 TL.setElaboratedKeywordLoc(TagLoc); 9955 TL.setQualifierLoc(QualifierLoc); 9956 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9957 } 9958 9959 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9960 TSI, FriendLoc); 9961 Friend->setAccess(AS_public); 9962 CurContext->addDecl(Friend); 9963 return Friend; 9964 } 9965 9966 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9967 9968 9969 9970 // Handle the case of a templated-scope friend class. e.g. 9971 // template <class T> class A<T>::B; 9972 // FIXME: we don't support these right now. 9973 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9974 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9975 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9976 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9977 TL.setElaboratedKeywordLoc(TagLoc); 9978 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9979 TL.setNameLoc(NameLoc); 9980 9981 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9982 TSI, FriendLoc); 9983 Friend->setAccess(AS_public); 9984 Friend->setUnsupportedFriend(true); 9985 CurContext->addDecl(Friend); 9986 return Friend; 9987} 9988 9989 9990/// Handle a friend type declaration. This works in tandem with 9991/// ActOnTag. 9992/// 9993/// Notes on friend class templates: 9994/// 9995/// We generally treat friend class declarations as if they were 9996/// declaring a class. So, for example, the elaborated type specifier 9997/// in a friend declaration is required to obey the restrictions of a 9998/// class-head (i.e. no typedefs in the scope chain), template 9999/// parameters are required to match up with simple template-ids, &c. 10000/// However, unlike when declaring a template specialization, it's 10001/// okay to refer to a template specialization without an empty 10002/// template parameter declaration, e.g. 10003/// friend class A<T>::B<unsigned>; 10004/// We permit this as a special case; if there are any template 10005/// parameters present at all, require proper matching, i.e. 10006/// template <> template <class T> friend class A<int>::B; 10007Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10008 MultiTemplateParamsArg TempParams) { 10009 SourceLocation Loc = DS.getSourceRange().getBegin(); 10010 10011 assert(DS.isFriendSpecified()); 10012 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10013 10014 // Try to convert the decl specifier to a type. This works for 10015 // friend templates because ActOnTag never produces a ClassTemplateDecl 10016 // for a TUK_Friend. 10017 Declarator TheDeclarator(DS, Declarator::MemberContext); 10018 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10019 QualType T = TSI->getType(); 10020 if (TheDeclarator.isInvalidType()) 10021 return 0; 10022 10023 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10024 return 0; 10025 10026 // This is definitely an error in C++98. It's probably meant to 10027 // be forbidden in C++0x, too, but the specification is just 10028 // poorly written. 10029 // 10030 // The problem is with declarations like the following: 10031 // template <T> friend A<T>::foo; 10032 // where deciding whether a class C is a friend or not now hinges 10033 // on whether there exists an instantiation of A that causes 10034 // 'foo' to equal C. There are restrictions on class-heads 10035 // (which we declare (by fiat) elaborated friend declarations to 10036 // be) that makes this tractable. 10037 // 10038 // FIXME: handle "template <> friend class A<T>;", which 10039 // is possibly well-formed? Who even knows? 10040 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10041 Diag(Loc, diag::err_tagless_friend_type_template) 10042 << DS.getSourceRange(); 10043 return 0; 10044 } 10045 10046 // C++98 [class.friend]p1: A friend of a class is a function 10047 // or class that is not a member of the class . . . 10048 // This is fixed in DR77, which just barely didn't make the C++03 10049 // deadline. It's also a very silly restriction that seriously 10050 // affects inner classes and which nobody else seems to implement; 10051 // thus we never diagnose it, not even in -pedantic. 10052 // 10053 // But note that we could warn about it: it's always useless to 10054 // friend one of your own members (it's not, however, worthless to 10055 // friend a member of an arbitrary specialization of your template). 10056 10057 Decl *D; 10058 if (unsigned NumTempParamLists = TempParams.size()) 10059 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10060 NumTempParamLists, 10061 TempParams.release(), 10062 TSI, 10063 DS.getFriendSpecLoc()); 10064 else 10065 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10066 10067 if (!D) 10068 return 0; 10069 10070 D->setAccess(AS_public); 10071 CurContext->addDecl(D); 10072 10073 return D; 10074} 10075 10076Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10077 MultiTemplateParamsArg TemplateParams) { 10078 const DeclSpec &DS = D.getDeclSpec(); 10079 10080 assert(DS.isFriendSpecified()); 10081 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10082 10083 SourceLocation Loc = D.getIdentifierLoc(); 10084 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10085 10086 // C++ [class.friend]p1 10087 // A friend of a class is a function or class.... 10088 // Note that this sees through typedefs, which is intended. 10089 // It *doesn't* see through dependent types, which is correct 10090 // according to [temp.arg.type]p3: 10091 // If a declaration acquires a function type through a 10092 // type dependent on a template-parameter and this causes 10093 // a declaration that does not use the syntactic form of a 10094 // function declarator to have a function type, the program 10095 // is ill-formed. 10096 if (!TInfo->getType()->isFunctionType()) { 10097 Diag(Loc, diag::err_unexpected_friend); 10098 10099 // It might be worthwhile to try to recover by creating an 10100 // appropriate declaration. 10101 return 0; 10102 } 10103 10104 // C++ [namespace.memdef]p3 10105 // - If a friend declaration in a non-local class first declares a 10106 // class or function, the friend class or function is a member 10107 // of the innermost enclosing namespace. 10108 // - The name of the friend is not found by simple name lookup 10109 // until a matching declaration is provided in that namespace 10110 // scope (either before or after the class declaration granting 10111 // friendship). 10112 // - If a friend function is called, its name may be found by the 10113 // name lookup that considers functions from namespaces and 10114 // classes associated with the types of the function arguments. 10115 // - When looking for a prior declaration of a class or a function 10116 // declared as a friend, scopes outside the innermost enclosing 10117 // namespace scope are not considered. 10118 10119 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10120 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10121 DeclarationName Name = NameInfo.getName(); 10122 assert(Name); 10123 10124 // Check for unexpanded parameter packs. 10125 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10126 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10127 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10128 return 0; 10129 10130 // The context we found the declaration in, or in which we should 10131 // create the declaration. 10132 DeclContext *DC; 10133 Scope *DCScope = S; 10134 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10135 ForRedeclaration); 10136 10137 // FIXME: there are different rules in local classes 10138 10139 // There are four cases here. 10140 // - There's no scope specifier, in which case we just go to the 10141 // appropriate scope and look for a function or function template 10142 // there as appropriate. 10143 // Recover from invalid scope qualifiers as if they just weren't there. 10144 if (SS.isInvalid() || !SS.isSet()) { 10145 // C++0x [namespace.memdef]p3: 10146 // If the name in a friend declaration is neither qualified nor 10147 // a template-id and the declaration is a function or an 10148 // elaborated-type-specifier, the lookup to determine whether 10149 // the entity has been previously declared shall not consider 10150 // any scopes outside the innermost enclosing namespace. 10151 // C++0x [class.friend]p11: 10152 // If a friend declaration appears in a local class and the name 10153 // specified is an unqualified name, a prior declaration is 10154 // looked up without considering scopes that are outside the 10155 // innermost enclosing non-class scope. For a friend function 10156 // declaration, if there is no prior declaration, the program is 10157 // ill-formed. 10158 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10159 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10160 10161 // Find the appropriate context according to the above. 10162 DC = CurContext; 10163 while (true) { 10164 // Skip class contexts. If someone can cite chapter and verse 10165 // for this behavior, that would be nice --- it's what GCC and 10166 // EDG do, and it seems like a reasonable intent, but the spec 10167 // really only says that checks for unqualified existing 10168 // declarations should stop at the nearest enclosing namespace, 10169 // not that they should only consider the nearest enclosing 10170 // namespace. 10171 while (DC->isRecord()) 10172 DC = DC->getParent(); 10173 10174 LookupQualifiedName(Previous, DC); 10175 10176 // TODO: decide what we think about using declarations. 10177 if (isLocal || !Previous.empty()) 10178 break; 10179 10180 if (isTemplateId) { 10181 if (isa<TranslationUnitDecl>(DC)) break; 10182 } else { 10183 if (DC->isFileContext()) break; 10184 } 10185 DC = DC->getParent(); 10186 } 10187 10188 // C++ [class.friend]p1: A friend of a class is a function or 10189 // class that is not a member of the class . . . 10190 // C++11 changes this for both friend types and functions. 10191 // Most C++ 98 compilers do seem to give an error here, so 10192 // we do, too. 10193 if (!Previous.empty() && DC->Equals(CurContext)) 10194 Diag(DS.getFriendSpecLoc(), 10195 getLangOptions().CPlusPlus0x ? 10196 diag::warn_cxx98_compat_friend_is_member : 10197 diag::err_friend_is_member); 10198 10199 DCScope = getScopeForDeclContext(S, DC); 10200 10201 // C++ [class.friend]p6: 10202 // A function can be defined in a friend declaration of a class if and 10203 // only if the class is a non-local class (9.8), the function name is 10204 // unqualified, and the function has namespace scope. 10205 if (isLocal && D.isFunctionDefinition()) { 10206 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10207 } 10208 10209 // - There's a non-dependent scope specifier, in which case we 10210 // compute it and do a previous lookup there for a function 10211 // or function template. 10212 } else if (!SS.getScopeRep()->isDependent()) { 10213 DC = computeDeclContext(SS); 10214 if (!DC) return 0; 10215 10216 if (RequireCompleteDeclContext(SS, DC)) return 0; 10217 10218 LookupQualifiedName(Previous, DC); 10219 10220 // Ignore things found implicitly in the wrong scope. 10221 // TODO: better diagnostics for this case. Suggesting the right 10222 // qualified scope would be nice... 10223 LookupResult::Filter F = Previous.makeFilter(); 10224 while (F.hasNext()) { 10225 NamedDecl *D = F.next(); 10226 if (!DC->InEnclosingNamespaceSetOf( 10227 D->getDeclContext()->getRedeclContext())) 10228 F.erase(); 10229 } 10230 F.done(); 10231 10232 if (Previous.empty()) { 10233 D.setInvalidType(); 10234 Diag(Loc, diag::err_qualified_friend_not_found) 10235 << Name << TInfo->getType(); 10236 return 0; 10237 } 10238 10239 // C++ [class.friend]p1: A friend of a class is a function or 10240 // class that is not a member of the class . . . 10241 if (DC->Equals(CurContext)) 10242 Diag(DS.getFriendSpecLoc(), 10243 getLangOptions().CPlusPlus0x ? 10244 diag::warn_cxx98_compat_friend_is_member : 10245 diag::err_friend_is_member); 10246 10247 if (D.isFunctionDefinition()) { 10248 // C++ [class.friend]p6: 10249 // A function can be defined in a friend declaration of a class if and 10250 // only if the class is a non-local class (9.8), the function name is 10251 // unqualified, and the function has namespace scope. 10252 SemaDiagnosticBuilder DB 10253 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10254 10255 DB << SS.getScopeRep(); 10256 if (DC->isFileContext()) 10257 DB << FixItHint::CreateRemoval(SS.getRange()); 10258 SS.clear(); 10259 } 10260 10261 // - There's a scope specifier that does not match any template 10262 // parameter lists, in which case we use some arbitrary context, 10263 // create a method or method template, and wait for instantiation. 10264 // - There's a scope specifier that does match some template 10265 // parameter lists, which we don't handle right now. 10266 } else { 10267 if (D.isFunctionDefinition()) { 10268 // C++ [class.friend]p6: 10269 // A function can be defined in a friend declaration of a class if and 10270 // only if the class is a non-local class (9.8), the function name is 10271 // unqualified, and the function has namespace scope. 10272 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10273 << SS.getScopeRep(); 10274 } 10275 10276 DC = CurContext; 10277 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10278 } 10279 10280 if (!DC->isRecord()) { 10281 // This implies that it has to be an operator or function. 10282 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10283 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10284 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10285 Diag(Loc, diag::err_introducing_special_friend) << 10286 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10287 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10288 return 0; 10289 } 10290 } 10291 10292 // FIXME: This is an egregious hack to cope with cases where the scope stack 10293 // does not contain the declaration context, i.e., in an out-of-line 10294 // definition of a class. 10295 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10296 if (!DCScope) { 10297 FakeDCScope.setEntity(DC); 10298 DCScope = &FakeDCScope; 10299 } 10300 10301 bool AddToScope = true; 10302 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10303 move(TemplateParams), AddToScope); 10304 if (!ND) return 0; 10305 10306 assert(ND->getDeclContext() == DC); 10307 assert(ND->getLexicalDeclContext() == CurContext); 10308 10309 // Add the function declaration to the appropriate lookup tables, 10310 // adjusting the redeclarations list as necessary. We don't 10311 // want to do this yet if the friending class is dependent. 10312 // 10313 // Also update the scope-based lookup if the target context's 10314 // lookup context is in lexical scope. 10315 if (!CurContext->isDependentContext()) { 10316 DC = DC->getRedeclContext(); 10317 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10318 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10319 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10320 } 10321 10322 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10323 D.getIdentifierLoc(), ND, 10324 DS.getFriendSpecLoc()); 10325 FrD->setAccess(AS_public); 10326 CurContext->addDecl(FrD); 10327 10328 if (ND->isInvalidDecl()) 10329 FrD->setInvalidDecl(); 10330 else { 10331 FunctionDecl *FD; 10332 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10333 FD = FTD->getTemplatedDecl(); 10334 else 10335 FD = cast<FunctionDecl>(ND); 10336 10337 // Mark templated-scope function declarations as unsupported. 10338 if (FD->getNumTemplateParameterLists()) 10339 FrD->setUnsupportedFriend(true); 10340 } 10341 10342 return ND; 10343} 10344 10345void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10346 AdjustDeclIfTemplate(Dcl); 10347 10348 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10349 if (!Fn) { 10350 Diag(DelLoc, diag::err_deleted_non_function); 10351 return; 10352 } 10353 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10354 Diag(DelLoc, diag::err_deleted_decl_not_first); 10355 Diag(Prev->getLocation(), diag::note_previous_declaration); 10356 // If the declaration wasn't the first, we delete the function anyway for 10357 // recovery. 10358 } 10359 Fn->setDeletedAsWritten(); 10360} 10361 10362void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10363 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10364 10365 if (MD) { 10366 if (MD->getParent()->isDependentType()) { 10367 MD->setDefaulted(); 10368 MD->setExplicitlyDefaulted(); 10369 return; 10370 } 10371 10372 CXXSpecialMember Member = getSpecialMember(MD); 10373 if (Member == CXXInvalid) { 10374 Diag(DefaultLoc, diag::err_default_special_members); 10375 return; 10376 } 10377 10378 MD->setDefaulted(); 10379 MD->setExplicitlyDefaulted(); 10380 10381 // If this definition appears within the record, do the checking when 10382 // the record is complete. 10383 const FunctionDecl *Primary = MD; 10384 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10385 // Find the uninstantiated declaration that actually had the '= default' 10386 // on it. 10387 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10388 10389 if (Primary == Primary->getCanonicalDecl()) 10390 return; 10391 10392 switch (Member) { 10393 case CXXDefaultConstructor: { 10394 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10395 CheckExplicitlyDefaultedDefaultConstructor(CD); 10396 if (!CD->isInvalidDecl()) 10397 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10398 break; 10399 } 10400 10401 case CXXCopyConstructor: { 10402 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10403 CheckExplicitlyDefaultedCopyConstructor(CD); 10404 if (!CD->isInvalidDecl()) 10405 DefineImplicitCopyConstructor(DefaultLoc, CD); 10406 break; 10407 } 10408 10409 case CXXCopyAssignment: { 10410 CheckExplicitlyDefaultedCopyAssignment(MD); 10411 if (!MD->isInvalidDecl()) 10412 DefineImplicitCopyAssignment(DefaultLoc, MD); 10413 break; 10414 } 10415 10416 case CXXDestructor: { 10417 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10418 CheckExplicitlyDefaultedDestructor(DD); 10419 if (!DD->isInvalidDecl()) 10420 DefineImplicitDestructor(DefaultLoc, DD); 10421 break; 10422 } 10423 10424 case CXXMoveConstructor: { 10425 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10426 CheckExplicitlyDefaultedMoveConstructor(CD); 10427 if (!CD->isInvalidDecl()) 10428 DefineImplicitMoveConstructor(DefaultLoc, CD); 10429 break; 10430 } 10431 10432 case CXXMoveAssignment: { 10433 CheckExplicitlyDefaultedMoveAssignment(MD); 10434 if (!MD->isInvalidDecl()) 10435 DefineImplicitMoveAssignment(DefaultLoc, MD); 10436 break; 10437 } 10438 10439 case CXXInvalid: 10440 llvm_unreachable("Invalid special member."); 10441 } 10442 } else { 10443 Diag(DefaultLoc, diag::err_default_special_members); 10444 } 10445} 10446 10447static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10448 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10449 Stmt *SubStmt = *CI; 10450 if (!SubStmt) 10451 continue; 10452 if (isa<ReturnStmt>(SubStmt)) 10453 Self.Diag(SubStmt->getSourceRange().getBegin(), 10454 diag::err_return_in_constructor_handler); 10455 if (!isa<Expr>(SubStmt)) 10456 SearchForReturnInStmt(Self, SubStmt); 10457 } 10458} 10459 10460void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10461 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10462 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10463 SearchForReturnInStmt(*this, Handler); 10464 } 10465} 10466 10467bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10468 const CXXMethodDecl *Old) { 10469 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10470 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10471 10472 if (Context.hasSameType(NewTy, OldTy) || 10473 NewTy->isDependentType() || OldTy->isDependentType()) 10474 return false; 10475 10476 // Check if the return types are covariant 10477 QualType NewClassTy, OldClassTy; 10478 10479 /// Both types must be pointers or references to classes. 10480 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10481 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10482 NewClassTy = NewPT->getPointeeType(); 10483 OldClassTy = OldPT->getPointeeType(); 10484 } 10485 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10486 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10487 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10488 NewClassTy = NewRT->getPointeeType(); 10489 OldClassTy = OldRT->getPointeeType(); 10490 } 10491 } 10492 } 10493 10494 // The return types aren't either both pointers or references to a class type. 10495 if (NewClassTy.isNull()) { 10496 Diag(New->getLocation(), 10497 diag::err_different_return_type_for_overriding_virtual_function) 10498 << New->getDeclName() << NewTy << OldTy; 10499 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10500 10501 return true; 10502 } 10503 10504 // C++ [class.virtual]p6: 10505 // If the return type of D::f differs from the return type of B::f, the 10506 // class type in the return type of D::f shall be complete at the point of 10507 // declaration of D::f or shall be the class type D. 10508 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10509 if (!RT->isBeingDefined() && 10510 RequireCompleteType(New->getLocation(), NewClassTy, 10511 PDiag(diag::err_covariant_return_incomplete) 10512 << New->getDeclName())) 10513 return true; 10514 } 10515 10516 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10517 // Check if the new class derives from the old class. 10518 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10519 Diag(New->getLocation(), 10520 diag::err_covariant_return_not_derived) 10521 << New->getDeclName() << NewTy << OldTy; 10522 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10523 return true; 10524 } 10525 10526 // Check if we the conversion from derived to base is valid. 10527 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10528 diag::err_covariant_return_inaccessible_base, 10529 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10530 // FIXME: Should this point to the return type? 10531 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10532 // FIXME: this note won't trigger for delayed access control 10533 // diagnostics, and it's impossible to get an undelayed error 10534 // here from access control during the original parse because 10535 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10536 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10537 return true; 10538 } 10539 } 10540 10541 // The qualifiers of the return types must be the same. 10542 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10543 Diag(New->getLocation(), 10544 diag::err_covariant_return_type_different_qualifications) 10545 << New->getDeclName() << NewTy << OldTy; 10546 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10547 return true; 10548 }; 10549 10550 10551 // The new class type must have the same or less qualifiers as the old type. 10552 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10553 Diag(New->getLocation(), 10554 diag::err_covariant_return_type_class_type_more_qualified) 10555 << New->getDeclName() << NewTy << OldTy; 10556 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10557 return true; 10558 }; 10559 10560 return false; 10561} 10562 10563/// \brief Mark the given method pure. 10564/// 10565/// \param Method the method to be marked pure. 10566/// 10567/// \param InitRange the source range that covers the "0" initializer. 10568bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10569 SourceLocation EndLoc = InitRange.getEnd(); 10570 if (EndLoc.isValid()) 10571 Method->setRangeEnd(EndLoc); 10572 10573 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10574 Method->setPure(); 10575 return false; 10576 } 10577 10578 if (!Method->isInvalidDecl()) 10579 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10580 << Method->getDeclName() << InitRange; 10581 return true; 10582} 10583 10584/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10585/// an initializer for the out-of-line declaration 'Dcl'. The scope 10586/// is a fresh scope pushed for just this purpose. 10587/// 10588/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10589/// static data member of class X, names should be looked up in the scope of 10590/// class X. 10591void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10592 // If there is no declaration, there was an error parsing it. 10593 if (D == 0 || D->isInvalidDecl()) return; 10594 10595 // We should only get called for declarations with scope specifiers, like: 10596 // int foo::bar; 10597 assert(D->isOutOfLine()); 10598 EnterDeclaratorContext(S, D->getDeclContext()); 10599} 10600 10601/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10602/// initializer for the out-of-line declaration 'D'. 10603void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10604 // If there is no declaration, there was an error parsing it. 10605 if (D == 0 || D->isInvalidDecl()) return; 10606 10607 assert(D->isOutOfLine()); 10608 ExitDeclaratorContext(S); 10609} 10610 10611/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10612/// C++ if/switch/while/for statement. 10613/// e.g: "if (int x = f()) {...}" 10614DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10615 // C++ 6.4p2: 10616 // The declarator shall not specify a function or an array. 10617 // The type-specifier-seq shall not contain typedef and shall not declare a 10618 // new class or enumeration. 10619 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10620 "Parser allowed 'typedef' as storage class of condition decl."); 10621 10622 Decl *Dcl = ActOnDeclarator(S, D); 10623 if (!Dcl) 10624 return true; 10625 10626 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10627 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10628 << D.getSourceRange(); 10629 return true; 10630 } 10631 10632 return Dcl; 10633} 10634 10635void Sema::LoadExternalVTableUses() { 10636 if (!ExternalSource) 10637 return; 10638 10639 SmallVector<ExternalVTableUse, 4> VTables; 10640 ExternalSource->ReadUsedVTables(VTables); 10641 SmallVector<VTableUse, 4> NewUses; 10642 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10643 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10644 = VTablesUsed.find(VTables[I].Record); 10645 // Even if a definition wasn't required before, it may be required now. 10646 if (Pos != VTablesUsed.end()) { 10647 if (!Pos->second && VTables[I].DefinitionRequired) 10648 Pos->second = true; 10649 continue; 10650 } 10651 10652 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10653 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10654 } 10655 10656 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10657} 10658 10659void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10660 bool DefinitionRequired) { 10661 // Ignore any vtable uses in unevaluated operands or for classes that do 10662 // not have a vtable. 10663 if (!Class->isDynamicClass() || Class->isDependentContext() || 10664 CurContext->isDependentContext() || 10665 ExprEvalContexts.back().Context == Unevaluated) 10666 return; 10667 10668 // Try to insert this class into the map. 10669 LoadExternalVTableUses(); 10670 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10671 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10672 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10673 if (!Pos.second) { 10674 // If we already had an entry, check to see if we are promoting this vtable 10675 // to required a definition. If so, we need to reappend to the VTableUses 10676 // list, since we may have already processed the first entry. 10677 if (DefinitionRequired && !Pos.first->second) { 10678 Pos.first->second = true; 10679 } else { 10680 // Otherwise, we can early exit. 10681 return; 10682 } 10683 } 10684 10685 // Local classes need to have their virtual members marked 10686 // immediately. For all other classes, we mark their virtual members 10687 // at the end of the translation unit. 10688 if (Class->isLocalClass()) 10689 MarkVirtualMembersReferenced(Loc, Class); 10690 else 10691 VTableUses.push_back(std::make_pair(Class, Loc)); 10692} 10693 10694bool Sema::DefineUsedVTables() { 10695 LoadExternalVTableUses(); 10696 if (VTableUses.empty()) 10697 return false; 10698 10699 // Note: The VTableUses vector could grow as a result of marking 10700 // the members of a class as "used", so we check the size each 10701 // time through the loop and prefer indices (with are stable) to 10702 // iterators (which are not). 10703 bool DefinedAnything = false; 10704 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10705 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10706 if (!Class) 10707 continue; 10708 10709 SourceLocation Loc = VTableUses[I].second; 10710 10711 // If this class has a key function, but that key function is 10712 // defined in another translation unit, we don't need to emit the 10713 // vtable even though we're using it. 10714 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10715 if (KeyFunction && !KeyFunction->hasBody()) { 10716 switch (KeyFunction->getTemplateSpecializationKind()) { 10717 case TSK_Undeclared: 10718 case TSK_ExplicitSpecialization: 10719 case TSK_ExplicitInstantiationDeclaration: 10720 // The key function is in another translation unit. 10721 continue; 10722 10723 case TSK_ExplicitInstantiationDefinition: 10724 case TSK_ImplicitInstantiation: 10725 // We will be instantiating the key function. 10726 break; 10727 } 10728 } else if (!KeyFunction) { 10729 // If we have a class with no key function that is the subject 10730 // of an explicit instantiation declaration, suppress the 10731 // vtable; it will live with the explicit instantiation 10732 // definition. 10733 bool IsExplicitInstantiationDeclaration 10734 = Class->getTemplateSpecializationKind() 10735 == TSK_ExplicitInstantiationDeclaration; 10736 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10737 REnd = Class->redecls_end(); 10738 R != REnd; ++R) { 10739 TemplateSpecializationKind TSK 10740 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10741 if (TSK == TSK_ExplicitInstantiationDeclaration) 10742 IsExplicitInstantiationDeclaration = true; 10743 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10744 IsExplicitInstantiationDeclaration = false; 10745 break; 10746 } 10747 } 10748 10749 if (IsExplicitInstantiationDeclaration) 10750 continue; 10751 } 10752 10753 // Mark all of the virtual members of this class as referenced, so 10754 // that we can build a vtable. Then, tell the AST consumer that a 10755 // vtable for this class is required. 10756 DefinedAnything = true; 10757 MarkVirtualMembersReferenced(Loc, Class); 10758 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10759 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10760 10761 // Optionally warn if we're emitting a weak vtable. 10762 if (Class->getLinkage() == ExternalLinkage && 10763 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10764 const FunctionDecl *KeyFunctionDef = 0; 10765 if (!KeyFunction || 10766 (KeyFunction->hasBody(KeyFunctionDef) && 10767 KeyFunctionDef->isInlined())) 10768 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10769 TSK_ExplicitInstantiationDefinition 10770 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10771 << Class; 10772 } 10773 } 10774 VTableUses.clear(); 10775 10776 return DefinedAnything; 10777} 10778 10779void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10780 const CXXRecordDecl *RD) { 10781 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10782 e = RD->method_end(); i != e; ++i) { 10783 CXXMethodDecl *MD = *i; 10784 10785 // C++ [basic.def.odr]p2: 10786 // [...] A virtual member function is used if it is not pure. [...] 10787 if (MD->isVirtual() && !MD->isPure()) 10788 MarkFunctionReferenced(Loc, MD); 10789 } 10790 10791 // Only classes that have virtual bases need a VTT. 10792 if (RD->getNumVBases() == 0) 10793 return; 10794 10795 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10796 e = RD->bases_end(); i != e; ++i) { 10797 const CXXRecordDecl *Base = 10798 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10799 if (Base->getNumVBases() == 0) 10800 continue; 10801 MarkVirtualMembersReferenced(Loc, Base); 10802 } 10803} 10804 10805/// SetIvarInitializers - This routine builds initialization ASTs for the 10806/// Objective-C implementation whose ivars need be initialized. 10807void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10808 if (!getLangOptions().CPlusPlus) 10809 return; 10810 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10811 SmallVector<ObjCIvarDecl*, 8> ivars; 10812 CollectIvarsToConstructOrDestruct(OID, ivars); 10813 if (ivars.empty()) 10814 return; 10815 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10816 for (unsigned i = 0; i < ivars.size(); i++) { 10817 FieldDecl *Field = ivars[i]; 10818 if (Field->isInvalidDecl()) 10819 continue; 10820 10821 CXXCtorInitializer *Member; 10822 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10823 InitializationKind InitKind = 10824 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10825 10826 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10827 ExprResult MemberInit = 10828 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10829 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10830 // Note, MemberInit could actually come back empty if no initialization 10831 // is required (e.g., because it would call a trivial default constructor) 10832 if (!MemberInit.get() || MemberInit.isInvalid()) 10833 continue; 10834 10835 Member = 10836 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10837 SourceLocation(), 10838 MemberInit.takeAs<Expr>(), 10839 SourceLocation()); 10840 AllToInit.push_back(Member); 10841 10842 // Be sure that the destructor is accessible and is marked as referenced. 10843 if (const RecordType *RecordTy 10844 = Context.getBaseElementType(Field->getType()) 10845 ->getAs<RecordType>()) { 10846 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10847 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10848 MarkFunctionReferenced(Field->getLocation(), Destructor); 10849 CheckDestructorAccess(Field->getLocation(), Destructor, 10850 PDiag(diag::err_access_dtor_ivar) 10851 << Context.getBaseElementType(Field->getType())); 10852 } 10853 } 10854 } 10855 ObjCImplementation->setIvarInitializers(Context, 10856 AllToInit.data(), AllToInit.size()); 10857 } 10858} 10859 10860static 10861void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10862 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10863 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10864 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10865 Sema &S) { 10866 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10867 CE = Current.end(); 10868 if (Ctor->isInvalidDecl()) 10869 return; 10870 10871 const FunctionDecl *FNTarget = 0; 10872 CXXConstructorDecl *Target; 10873 10874 // We ignore the result here since if we don't have a body, Target will be 10875 // null below. 10876 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10877 Target 10878= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10879 10880 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10881 // Avoid dereferencing a null pointer here. 10882 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10883 10884 if (!Current.insert(Canonical)) 10885 return; 10886 10887 // We know that beyond here, we aren't chaining into a cycle. 10888 if (!Target || !Target->isDelegatingConstructor() || 10889 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10890 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10891 Valid.insert(*CI); 10892 Current.clear(); 10893 // We've hit a cycle. 10894 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10895 Current.count(TCanonical)) { 10896 // If we haven't diagnosed this cycle yet, do so now. 10897 if (!Invalid.count(TCanonical)) { 10898 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10899 diag::warn_delegating_ctor_cycle) 10900 << Ctor; 10901 10902 // Don't add a note for a function delegating directo to itself. 10903 if (TCanonical != Canonical) 10904 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10905 10906 CXXConstructorDecl *C = Target; 10907 while (C->getCanonicalDecl() != Canonical) { 10908 (void)C->getTargetConstructor()->hasBody(FNTarget); 10909 assert(FNTarget && "Ctor cycle through bodiless function"); 10910 10911 C 10912 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10913 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10914 } 10915 } 10916 10917 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10918 Invalid.insert(*CI); 10919 Current.clear(); 10920 } else { 10921 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10922 } 10923} 10924 10925 10926void Sema::CheckDelegatingCtorCycles() { 10927 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10928 10929 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10930 CE = Current.end(); 10931 10932 for (DelegatingCtorDeclsType::iterator 10933 I = DelegatingCtorDecls.begin(ExternalSource), 10934 E = DelegatingCtorDecls.end(); 10935 I != E; ++I) { 10936 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10937 } 10938 10939 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10940 (*CI)->setInvalidDecl(); 10941} 10942 10943/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10944Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10945 // Implicitly declared functions (e.g. copy constructors) are 10946 // __host__ __device__ 10947 if (D->isImplicit()) 10948 return CFT_HostDevice; 10949 10950 if (D->hasAttr<CUDAGlobalAttr>()) 10951 return CFT_Global; 10952 10953 if (D->hasAttr<CUDADeviceAttr>()) { 10954 if (D->hasAttr<CUDAHostAttr>()) 10955 return CFT_HostDevice; 10956 else 10957 return CFT_Device; 10958 } 10959 10960 return CFT_Host; 10961} 10962 10963bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10964 CUDAFunctionTarget CalleeTarget) { 10965 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10966 // Callable from the device only." 10967 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10968 return true; 10969 10970 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10971 // Callable from the host only." 10972 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10973 // Callable from the host only." 10974 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10975 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10976 return true; 10977 10978 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10979 return true; 10980 10981 return false; 10982} 10983