SemaDeclCXX.cpp revision 213d70b58b4f48050c3e545ce1bd4b0ec3af74be
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 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 589 isa<CXXMethodDecl>(FD) && 590 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 591 592 // Find first parameter with a default argument 593 for (p = 0; p < NumParams; ++p) { 594 ParmVarDecl *Param = FD->getParamDecl(p); 595 if (Param->hasDefaultArg()) { 596 // C++11 [expr.prim.lambda]p5: 597 // [...] Default arguments (8.3.6) shall not be specified in the 598 // parameter-declaration-clause of a lambda-declarator. 599 // 600 // FIXME: Core issue 974 strikes this sentence, we only provide an 601 // extension warning. 602 if (IsLambda) 603 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 604 << Param->getDefaultArgRange(); 605 break; 606 } 607 } 608 609 // C++ [dcl.fct.default]p4: 610 // In a given function declaration, all parameters 611 // subsequent to a parameter with a default argument shall 612 // have default arguments supplied in this or previous 613 // declarations. A default argument shall not be redefined 614 // by a later declaration (not even to the same value). 615 unsigned LastMissingDefaultArg = 0; 616 for (; p < NumParams; ++p) { 617 ParmVarDecl *Param = FD->getParamDecl(p); 618 if (!Param->hasDefaultArg()) { 619 if (Param->isInvalidDecl()) 620 /* We already complained about this parameter. */; 621 else if (Param->getIdentifier()) 622 Diag(Param->getLocation(), 623 diag::err_param_default_argument_missing_name) 624 << Param->getIdentifier(); 625 else 626 Diag(Param->getLocation(), 627 diag::err_param_default_argument_missing); 628 629 LastMissingDefaultArg = p; 630 } 631 } 632 633 if (LastMissingDefaultArg > 0) { 634 // Some default arguments were missing. Clear out all of the 635 // default arguments up to (and including) the last missing 636 // default argument, so that we leave the function parameters 637 // in a semantically valid state. 638 for (p = 0; p <= LastMissingDefaultArg; ++p) { 639 ParmVarDecl *Param = FD->getParamDecl(p); 640 if (Param->hasDefaultArg()) { 641 Param->setDefaultArg(0); 642 } 643 } 644 } 645} 646 647// CheckConstexprParameterTypes - Check whether a function's parameter types 648// are all literal types. If so, return true. If not, produce a suitable 649// diagnostic and return false. 650static bool CheckConstexprParameterTypes(Sema &SemaRef, 651 const FunctionDecl *FD) { 652 unsigned ArgIndex = 0; 653 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 654 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 655 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 656 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 657 SourceLocation ParamLoc = PD->getLocation(); 658 if (!(*i)->isDependentType() && 659 SemaRef.RequireLiteralType(ParamLoc, *i, 660 SemaRef.PDiag(diag::err_constexpr_non_literal_param) 661 << ArgIndex+1 << PD->getSourceRange() 662 << isa<CXXConstructorDecl>(FD))) 663 return false; 664 } 665 return true; 666} 667 668// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 669// the requirements of a constexpr function definition or a constexpr 670// constructor definition. If so, return true. If not, produce appropriate 671// diagnostics and return false. 672// 673// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 674bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 675 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 676 if (MD && MD->isInstance()) { 677 // C++11 [dcl.constexpr]p4: 678 // The definition of a constexpr constructor shall satisfy the following 679 // constraints: 680 // - the class shall not have any virtual base classes; 681 const CXXRecordDecl *RD = MD->getParent(); 682 if (RD->getNumVBases()) { 683 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 684 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 685 << RD->getNumVBases(); 686 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 687 E = RD->vbases_end(); I != E; ++I) 688 Diag(I->getSourceRange().getBegin(), 689 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 690 return false; 691 } 692 } 693 694 if (!isa<CXXConstructorDecl>(NewFD)) { 695 // C++11 [dcl.constexpr]p3: 696 // The definition of a constexpr function shall satisfy the following 697 // constraints: 698 // - it shall not be virtual; 699 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 700 if (Method && Method->isVirtual()) { 701 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 702 703 // If it's not obvious why this function is virtual, find an overridden 704 // function which uses the 'virtual' keyword. 705 const CXXMethodDecl *WrittenVirtual = Method; 706 while (!WrittenVirtual->isVirtualAsWritten()) 707 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 708 if (WrittenVirtual != Method) 709 Diag(WrittenVirtual->getLocation(), 710 diag::note_overridden_virtual_function); 711 return false; 712 } 713 714 // - its return type shall be a literal type; 715 QualType RT = NewFD->getResultType(); 716 if (!RT->isDependentType() && 717 RequireLiteralType(NewFD->getLocation(), RT, 718 PDiag(diag::err_constexpr_non_literal_return))) 719 return false; 720 } 721 722 // - each of its parameter types shall be a literal type; 723 if (!CheckConstexprParameterTypes(*this, NewFD)) 724 return false; 725 726 return true; 727} 728 729/// Check the given declaration statement is legal within a constexpr function 730/// body. C++0x [dcl.constexpr]p3,p4. 731/// 732/// \return true if the body is OK, false if we have diagnosed a problem. 733static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 734 DeclStmt *DS) { 735 // C++0x [dcl.constexpr]p3 and p4: 736 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 737 // contain only 738 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 739 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 740 switch ((*DclIt)->getKind()) { 741 case Decl::StaticAssert: 742 case Decl::Using: 743 case Decl::UsingShadow: 744 case Decl::UsingDirective: 745 case Decl::UnresolvedUsingTypename: 746 // - static_assert-declarations 747 // - using-declarations, 748 // - using-directives, 749 continue; 750 751 case Decl::Typedef: 752 case Decl::TypeAlias: { 753 // - typedef declarations and alias-declarations that do not define 754 // classes or enumerations, 755 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 756 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 757 // Don't allow variably-modified types in constexpr functions. 758 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 759 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 760 << TL.getSourceRange() << TL.getType() 761 << isa<CXXConstructorDecl>(Dcl); 762 return false; 763 } 764 continue; 765 } 766 767 case Decl::Enum: 768 case Decl::CXXRecord: 769 // As an extension, we allow the declaration (but not the definition) of 770 // classes and enumerations in all declarations, not just in typedef and 771 // alias declarations. 772 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 773 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 774 << isa<CXXConstructorDecl>(Dcl); 775 return false; 776 } 777 continue; 778 779 case Decl::Var: 780 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 781 << isa<CXXConstructorDecl>(Dcl); 782 return false; 783 784 default: 785 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 786 << isa<CXXConstructorDecl>(Dcl); 787 return false; 788 } 789 } 790 791 return true; 792} 793 794/// Check that the given field is initialized within a constexpr constructor. 795/// 796/// \param Dcl The constexpr constructor being checked. 797/// \param Field The field being checked. This may be a member of an anonymous 798/// struct or union nested within the class being checked. 799/// \param Inits All declarations, including anonymous struct/union members and 800/// indirect members, for which any initialization was provided. 801/// \param Diagnosed Set to true if an error is produced. 802static void CheckConstexprCtorInitializer(Sema &SemaRef, 803 const FunctionDecl *Dcl, 804 FieldDecl *Field, 805 llvm::SmallSet<Decl*, 16> &Inits, 806 bool &Diagnosed) { 807 if (Field->isUnnamedBitfield()) 808 return; 809 810 if (Field->isAnonymousStructOrUnion() && 811 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 812 return; 813 814 if (!Inits.count(Field)) { 815 if (!Diagnosed) { 816 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 817 Diagnosed = true; 818 } 819 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 820 } else if (Field->isAnonymousStructOrUnion()) { 821 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 822 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 823 I != E; ++I) 824 // If an anonymous union contains an anonymous struct of which any member 825 // is initialized, all members must be initialized. 826 if (!RD->isUnion() || Inits.count(*I)) 827 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 828 } 829} 830 831/// Check the body for the given constexpr function declaration only contains 832/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 833/// 834/// \return true if the body is OK, false if we have diagnosed a problem. 835bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 836 if (isa<CXXTryStmt>(Body)) { 837 // C++11 [dcl.constexpr]p3: 838 // The definition of a constexpr function shall satisfy the following 839 // constraints: [...] 840 // - its function-body shall be = delete, = default, or a 841 // compound-statement 842 // 843 // C++11 [dcl.constexpr]p4: 844 // In the definition of a constexpr constructor, [...] 845 // - its function-body shall not be a function-try-block; 846 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 847 << isa<CXXConstructorDecl>(Dcl); 848 return false; 849 } 850 851 // - its function-body shall be [...] a compound-statement that contains only 852 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 853 854 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 855 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 856 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 857 switch ((*BodyIt)->getStmtClass()) { 858 case Stmt::NullStmtClass: 859 // - null statements, 860 continue; 861 862 case Stmt::DeclStmtClass: 863 // - static_assert-declarations 864 // - using-declarations, 865 // - using-directives, 866 // - typedef declarations and alias-declarations that do not define 867 // classes or enumerations, 868 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 869 return false; 870 continue; 871 872 case Stmt::ReturnStmtClass: 873 // - and exactly one return statement; 874 if (isa<CXXConstructorDecl>(Dcl)) 875 break; 876 877 ReturnStmts.push_back((*BodyIt)->getLocStart()); 878 continue; 879 880 default: 881 break; 882 } 883 884 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 885 << isa<CXXConstructorDecl>(Dcl); 886 return false; 887 } 888 889 if (const CXXConstructorDecl *Constructor 890 = dyn_cast<CXXConstructorDecl>(Dcl)) { 891 const CXXRecordDecl *RD = Constructor->getParent(); 892 // DR1359: 893 // - every non-variant non-static data member and base class sub-object 894 // shall be initialized; 895 // - if the class is a non-empty union, or for each non-empty anonymous 896 // union member of a non-union class, exactly one non-static data member 897 // shall be initialized; 898 if (RD->isUnion()) { 899 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 900 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 901 return false; 902 } 903 } else if (!Constructor->isDependentContext() && 904 !Constructor->isDelegatingConstructor()) { 905 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 906 907 // Skip detailed checking if we have enough initializers, and we would 908 // allow at most one initializer per member. 909 bool AnyAnonStructUnionMembers = false; 910 unsigned Fields = 0; 911 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 912 E = RD->field_end(); I != E; ++I, ++Fields) { 913 if ((*I)->isAnonymousStructOrUnion()) { 914 AnyAnonStructUnionMembers = true; 915 break; 916 } 917 } 918 if (AnyAnonStructUnionMembers || 919 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 920 // Check initialization of non-static data members. Base classes are 921 // always initialized so do not need to be checked. Dependent bases 922 // might not have initializers in the member initializer list. 923 llvm::SmallSet<Decl*, 16> Inits; 924 for (CXXConstructorDecl::init_const_iterator 925 I = Constructor->init_begin(), E = Constructor->init_end(); 926 I != E; ++I) { 927 if (FieldDecl *FD = (*I)->getMember()) 928 Inits.insert(FD); 929 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 930 Inits.insert(ID->chain_begin(), ID->chain_end()); 931 } 932 933 bool Diagnosed = false; 934 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 935 E = RD->field_end(); I != E; ++I) 936 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 937 if (Diagnosed) 938 return false; 939 } 940 } 941 } else { 942 if (ReturnStmts.empty()) { 943 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 944 return false; 945 } 946 if (ReturnStmts.size() > 1) { 947 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 948 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 949 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 950 return false; 951 } 952 } 953 954 // C++11 [dcl.constexpr]p5: 955 // if no function argument values exist such that the function invocation 956 // substitution would produce a constant expression, the program is 957 // ill-formed; no diagnostic required. 958 // C++11 [dcl.constexpr]p3: 959 // - every constructor call and implicit conversion used in initializing the 960 // return value shall be one of those allowed in a constant expression. 961 // C++11 [dcl.constexpr]p4: 962 // - every constructor involved in initializing non-static data members and 963 // base class sub-objects shall be a constexpr constructor. 964 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 965 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 966 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 967 << isa<CXXConstructorDecl>(Dcl); 968 for (size_t I = 0, N = Diags.size(); I != N; ++I) 969 Diag(Diags[I].first, Diags[I].second); 970 return false; 971 } 972 973 return true; 974} 975 976/// isCurrentClassName - Determine whether the identifier II is the 977/// name of the class type currently being defined. In the case of 978/// nested classes, this will only return true if II is the name of 979/// the innermost class. 980bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 981 const CXXScopeSpec *SS) { 982 assert(getLangOptions().CPlusPlus && "No class names in C!"); 983 984 CXXRecordDecl *CurDecl; 985 if (SS && SS->isSet() && !SS->isInvalid()) { 986 DeclContext *DC = computeDeclContext(*SS, true); 987 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 988 } else 989 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 990 991 if (CurDecl && CurDecl->getIdentifier()) 992 return &II == CurDecl->getIdentifier(); 993 else 994 return false; 995} 996 997/// \brief Check the validity of a C++ base class specifier. 998/// 999/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1000/// and returns NULL otherwise. 1001CXXBaseSpecifier * 1002Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1003 SourceRange SpecifierRange, 1004 bool Virtual, AccessSpecifier Access, 1005 TypeSourceInfo *TInfo, 1006 SourceLocation EllipsisLoc) { 1007 QualType BaseType = TInfo->getType(); 1008 1009 // C++ [class.union]p1: 1010 // A union shall not have base classes. 1011 if (Class->isUnion()) { 1012 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1013 << SpecifierRange; 1014 return 0; 1015 } 1016 1017 if (EllipsisLoc.isValid() && 1018 !TInfo->getType()->containsUnexpandedParameterPack()) { 1019 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1020 << TInfo->getTypeLoc().getSourceRange(); 1021 EllipsisLoc = SourceLocation(); 1022 } 1023 1024 if (BaseType->isDependentType()) 1025 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1026 Class->getTagKind() == TTK_Class, 1027 Access, TInfo, EllipsisLoc); 1028 1029 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1030 1031 // Base specifiers must be record types. 1032 if (!BaseType->isRecordType()) { 1033 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1034 return 0; 1035 } 1036 1037 // C++ [class.union]p1: 1038 // A union shall not be used as a base class. 1039 if (BaseType->isUnionType()) { 1040 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1041 return 0; 1042 } 1043 1044 // C++ [class.derived]p2: 1045 // The class-name in a base-specifier shall not be an incompletely 1046 // defined class. 1047 if (RequireCompleteType(BaseLoc, BaseType, 1048 PDiag(diag::err_incomplete_base_class) 1049 << SpecifierRange)) { 1050 Class->setInvalidDecl(); 1051 return 0; 1052 } 1053 1054 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1055 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1056 assert(BaseDecl && "Record type has no declaration"); 1057 BaseDecl = BaseDecl->getDefinition(); 1058 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1059 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1060 assert(CXXBaseDecl && "Base type is not a C++ type"); 1061 1062 // C++ [class]p3: 1063 // If a class is marked final and it appears as a base-type-specifier in 1064 // base-clause, the program is ill-formed. 1065 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1066 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1067 << CXXBaseDecl->getDeclName(); 1068 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1069 << CXXBaseDecl->getDeclName(); 1070 return 0; 1071 } 1072 1073 if (BaseDecl->isInvalidDecl()) 1074 Class->setInvalidDecl(); 1075 1076 // Create the base specifier. 1077 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1078 Class->getTagKind() == TTK_Class, 1079 Access, TInfo, EllipsisLoc); 1080} 1081 1082/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1083/// one entry in the base class list of a class specifier, for 1084/// example: 1085/// class foo : public bar, virtual private baz { 1086/// 'public bar' and 'virtual private baz' are each base-specifiers. 1087BaseResult 1088Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1089 bool Virtual, AccessSpecifier Access, 1090 ParsedType basetype, SourceLocation BaseLoc, 1091 SourceLocation EllipsisLoc) { 1092 if (!classdecl) 1093 return true; 1094 1095 AdjustDeclIfTemplate(classdecl); 1096 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1097 if (!Class) 1098 return true; 1099 1100 TypeSourceInfo *TInfo = 0; 1101 GetTypeFromParser(basetype, &TInfo); 1102 1103 if (EllipsisLoc.isInvalid() && 1104 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1105 UPPC_BaseType)) 1106 return true; 1107 1108 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1109 Virtual, Access, TInfo, 1110 EllipsisLoc)) 1111 return BaseSpec; 1112 1113 return true; 1114} 1115 1116/// \brief Performs the actual work of attaching the given base class 1117/// specifiers to a C++ class. 1118bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1119 unsigned NumBases) { 1120 if (NumBases == 0) 1121 return false; 1122 1123 // Used to keep track of which base types we have already seen, so 1124 // that we can properly diagnose redundant direct base types. Note 1125 // that the key is always the unqualified canonical type of the base 1126 // class. 1127 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1128 1129 // Copy non-redundant base specifiers into permanent storage. 1130 unsigned NumGoodBases = 0; 1131 bool Invalid = false; 1132 for (unsigned idx = 0; idx < NumBases; ++idx) { 1133 QualType NewBaseType 1134 = Context.getCanonicalType(Bases[idx]->getType()); 1135 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1136 if (KnownBaseTypes[NewBaseType]) { 1137 // C++ [class.mi]p3: 1138 // A class shall not be specified as a direct base class of a 1139 // derived class more than once. 1140 Diag(Bases[idx]->getSourceRange().getBegin(), 1141 diag::err_duplicate_base_class) 1142 << KnownBaseTypes[NewBaseType]->getType() 1143 << Bases[idx]->getSourceRange(); 1144 1145 // Delete the duplicate base class specifier; we're going to 1146 // overwrite its pointer later. 1147 Context.Deallocate(Bases[idx]); 1148 1149 Invalid = true; 1150 } else { 1151 // Okay, add this new base class. 1152 KnownBaseTypes[NewBaseType] = Bases[idx]; 1153 Bases[NumGoodBases++] = Bases[idx]; 1154 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1155 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1156 if (RD->hasAttr<WeakAttr>()) 1157 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1158 } 1159 } 1160 1161 // Attach the remaining base class specifiers to the derived class. 1162 Class->setBases(Bases, NumGoodBases); 1163 1164 // Delete the remaining (good) base class specifiers, since their 1165 // data has been copied into the CXXRecordDecl. 1166 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1167 Context.Deallocate(Bases[idx]); 1168 1169 return Invalid; 1170} 1171 1172/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1173/// class, after checking whether there are any duplicate base 1174/// classes. 1175void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1176 unsigned NumBases) { 1177 if (!ClassDecl || !Bases || !NumBases) 1178 return; 1179 1180 AdjustDeclIfTemplate(ClassDecl); 1181 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1182 (CXXBaseSpecifier**)(Bases), NumBases); 1183} 1184 1185static CXXRecordDecl *GetClassForType(QualType T) { 1186 if (const RecordType *RT = T->getAs<RecordType>()) 1187 return cast<CXXRecordDecl>(RT->getDecl()); 1188 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1189 return ICT->getDecl(); 1190 else 1191 return 0; 1192} 1193 1194/// \brief Determine whether the type \p Derived is a C++ class that is 1195/// derived from the type \p Base. 1196bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1197 if (!getLangOptions().CPlusPlus) 1198 return false; 1199 1200 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1201 if (!DerivedRD) 1202 return false; 1203 1204 CXXRecordDecl *BaseRD = GetClassForType(Base); 1205 if (!BaseRD) 1206 return false; 1207 1208 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1209 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1210} 1211 1212/// \brief Determine whether the type \p Derived is a C++ class that is 1213/// derived from the type \p Base. 1214bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1215 if (!getLangOptions().CPlusPlus) 1216 return false; 1217 1218 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1219 if (!DerivedRD) 1220 return false; 1221 1222 CXXRecordDecl *BaseRD = GetClassForType(Base); 1223 if (!BaseRD) 1224 return false; 1225 1226 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1227} 1228 1229void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1230 CXXCastPath &BasePathArray) { 1231 assert(BasePathArray.empty() && "Base path array must be empty!"); 1232 assert(Paths.isRecordingPaths() && "Must record paths!"); 1233 1234 const CXXBasePath &Path = Paths.front(); 1235 1236 // We first go backward and check if we have a virtual base. 1237 // FIXME: It would be better if CXXBasePath had the base specifier for 1238 // the nearest virtual base. 1239 unsigned Start = 0; 1240 for (unsigned I = Path.size(); I != 0; --I) { 1241 if (Path[I - 1].Base->isVirtual()) { 1242 Start = I - 1; 1243 break; 1244 } 1245 } 1246 1247 // Now add all bases. 1248 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1249 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1250} 1251 1252/// \brief Determine whether the given base path includes a virtual 1253/// base class. 1254bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1255 for (CXXCastPath::const_iterator B = BasePath.begin(), 1256 BEnd = BasePath.end(); 1257 B != BEnd; ++B) 1258 if ((*B)->isVirtual()) 1259 return true; 1260 1261 return false; 1262} 1263 1264/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1265/// conversion (where Derived and Base are class types) is 1266/// well-formed, meaning that the conversion is unambiguous (and 1267/// that all of the base classes are accessible). Returns true 1268/// and emits a diagnostic if the code is ill-formed, returns false 1269/// otherwise. Loc is the location where this routine should point to 1270/// if there is an error, and Range is the source range to highlight 1271/// if there is an error. 1272bool 1273Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1274 unsigned InaccessibleBaseID, 1275 unsigned AmbigiousBaseConvID, 1276 SourceLocation Loc, SourceRange Range, 1277 DeclarationName Name, 1278 CXXCastPath *BasePath) { 1279 // First, determine whether the path from Derived to Base is 1280 // ambiguous. This is slightly more expensive than checking whether 1281 // the Derived to Base conversion exists, because here we need to 1282 // explore multiple paths to determine if there is an ambiguity. 1283 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1284 /*DetectVirtual=*/false); 1285 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1286 assert(DerivationOkay && 1287 "Can only be used with a derived-to-base conversion"); 1288 (void)DerivationOkay; 1289 1290 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1291 if (InaccessibleBaseID) { 1292 // Check that the base class can be accessed. 1293 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1294 InaccessibleBaseID)) { 1295 case AR_inaccessible: 1296 return true; 1297 case AR_accessible: 1298 case AR_dependent: 1299 case AR_delayed: 1300 break; 1301 } 1302 } 1303 1304 // Build a base path if necessary. 1305 if (BasePath) 1306 BuildBasePathArray(Paths, *BasePath); 1307 return false; 1308 } 1309 1310 // We know that the derived-to-base conversion is ambiguous, and 1311 // we're going to produce a diagnostic. Perform the derived-to-base 1312 // search just one more time to compute all of the possible paths so 1313 // that we can print them out. This is more expensive than any of 1314 // the previous derived-to-base checks we've done, but at this point 1315 // performance isn't as much of an issue. 1316 Paths.clear(); 1317 Paths.setRecordingPaths(true); 1318 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1319 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1320 (void)StillOkay; 1321 1322 // Build up a textual representation of the ambiguous paths, e.g., 1323 // D -> B -> A, that will be used to illustrate the ambiguous 1324 // conversions in the diagnostic. We only print one of the paths 1325 // to each base class subobject. 1326 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1327 1328 Diag(Loc, AmbigiousBaseConvID) 1329 << Derived << Base << PathDisplayStr << Range << Name; 1330 return true; 1331} 1332 1333bool 1334Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1335 SourceLocation Loc, SourceRange Range, 1336 CXXCastPath *BasePath, 1337 bool IgnoreAccess) { 1338 return CheckDerivedToBaseConversion(Derived, Base, 1339 IgnoreAccess ? 0 1340 : diag::err_upcast_to_inaccessible_base, 1341 diag::err_ambiguous_derived_to_base_conv, 1342 Loc, Range, DeclarationName(), 1343 BasePath); 1344} 1345 1346 1347/// @brief Builds a string representing ambiguous paths from a 1348/// specific derived class to different subobjects of the same base 1349/// class. 1350/// 1351/// This function builds a string that can be used in error messages 1352/// to show the different paths that one can take through the 1353/// inheritance hierarchy to go from the derived class to different 1354/// subobjects of a base class. The result looks something like this: 1355/// @code 1356/// struct D -> struct B -> struct A 1357/// struct D -> struct C -> struct A 1358/// @endcode 1359std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1360 std::string PathDisplayStr; 1361 std::set<unsigned> DisplayedPaths; 1362 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1363 Path != Paths.end(); ++Path) { 1364 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1365 // We haven't displayed a path to this particular base 1366 // class subobject yet. 1367 PathDisplayStr += "\n "; 1368 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1369 for (CXXBasePath::const_iterator Element = Path->begin(); 1370 Element != Path->end(); ++Element) 1371 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1372 } 1373 } 1374 1375 return PathDisplayStr; 1376} 1377 1378//===----------------------------------------------------------------------===// 1379// C++ class member Handling 1380//===----------------------------------------------------------------------===// 1381 1382/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1383bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1384 SourceLocation ASLoc, 1385 SourceLocation ColonLoc, 1386 AttributeList *Attrs) { 1387 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1388 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1389 ASLoc, ColonLoc); 1390 CurContext->addHiddenDecl(ASDecl); 1391 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1392} 1393 1394/// CheckOverrideControl - Check C++0x override control semantics. 1395void Sema::CheckOverrideControl(const Decl *D) { 1396 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1397 if (!MD || !MD->isVirtual()) 1398 return; 1399 1400 if (MD->isDependentContext()) 1401 return; 1402 1403 // C++0x [class.virtual]p3: 1404 // If a virtual function is marked with the virt-specifier override and does 1405 // not override a member function of a base class, 1406 // the program is ill-formed. 1407 bool HasOverriddenMethods = 1408 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1409 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1410 Diag(MD->getLocation(), 1411 diag::err_function_marked_override_not_overriding) 1412 << MD->getDeclName(); 1413 return; 1414 } 1415} 1416 1417/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1418/// function overrides a virtual member function marked 'final', according to 1419/// C++0x [class.virtual]p3. 1420bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1421 const CXXMethodDecl *Old) { 1422 if (!Old->hasAttr<FinalAttr>()) 1423 return false; 1424 1425 Diag(New->getLocation(), diag::err_final_function_overridden) 1426 << New->getDeclName(); 1427 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1428 return true; 1429} 1430 1431/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1432/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1433/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1434/// one has been parsed, and 'HasDeferredInit' is true if an initializer is 1435/// present but parsing it has been deferred. 1436Decl * 1437Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1438 MultiTemplateParamsArg TemplateParameterLists, 1439 Expr *BW, const VirtSpecifiers &VS, 1440 bool HasDeferredInit) { 1441 const DeclSpec &DS = D.getDeclSpec(); 1442 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1443 DeclarationName Name = NameInfo.getName(); 1444 SourceLocation Loc = NameInfo.getLoc(); 1445 1446 // For anonymous bitfields, the location should point to the type. 1447 if (Loc.isInvalid()) 1448 Loc = D.getSourceRange().getBegin(); 1449 1450 Expr *BitWidth = static_cast<Expr*>(BW); 1451 1452 assert(isa<CXXRecordDecl>(CurContext)); 1453 assert(!DS.isFriendSpecified()); 1454 1455 bool isFunc = D.isDeclarationOfFunction(); 1456 1457 // C++ 9.2p6: A member shall not be declared to have automatic storage 1458 // duration (auto, register) or with the extern storage-class-specifier. 1459 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1460 // data members and cannot be applied to names declared const or static, 1461 // and cannot be applied to reference members. 1462 switch (DS.getStorageClassSpec()) { 1463 case DeclSpec::SCS_unspecified: 1464 case DeclSpec::SCS_typedef: 1465 case DeclSpec::SCS_static: 1466 // FALL THROUGH. 1467 break; 1468 case DeclSpec::SCS_mutable: 1469 if (isFunc) { 1470 if (DS.getStorageClassSpecLoc().isValid()) 1471 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1472 else 1473 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1474 1475 // FIXME: It would be nicer if the keyword was ignored only for this 1476 // declarator. Otherwise we could get follow-up errors. 1477 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1478 } 1479 break; 1480 default: 1481 if (DS.getStorageClassSpecLoc().isValid()) 1482 Diag(DS.getStorageClassSpecLoc(), 1483 diag::err_storageclass_invalid_for_member); 1484 else 1485 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1486 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1487 } 1488 1489 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1490 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1491 !isFunc); 1492 1493 Decl *Member; 1494 if (isInstField) { 1495 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1496 1497 // Data members must have identifiers for names. 1498 if (Name.getNameKind() != DeclarationName::Identifier) { 1499 Diag(Loc, diag::err_bad_variable_name) 1500 << Name; 1501 return 0; 1502 } 1503 1504 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1505 1506 // Member field could not be with "template" keyword. 1507 // So TemplateParameterLists should be empty in this case. 1508 if (TemplateParameterLists.size()) { 1509 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1510 if (TemplateParams->size()) { 1511 // There is no such thing as a member field template. 1512 Diag(D.getIdentifierLoc(), diag::err_template_member) 1513 << II 1514 << SourceRange(TemplateParams->getTemplateLoc(), 1515 TemplateParams->getRAngleLoc()); 1516 } else { 1517 // There is an extraneous 'template<>' for this member. 1518 Diag(TemplateParams->getTemplateLoc(), 1519 diag::err_template_member_noparams) 1520 << II 1521 << SourceRange(TemplateParams->getTemplateLoc(), 1522 TemplateParams->getRAngleLoc()); 1523 } 1524 return 0; 1525 } 1526 1527 if (SS.isSet() && !SS.isInvalid()) { 1528 // The user provided a superfluous scope specifier inside a class 1529 // definition: 1530 // 1531 // class X { 1532 // int X::member; 1533 // }; 1534 DeclContext *DC = 0; 1535 if ((DC = computeDeclContext(SS, false)) && DC->Equals(CurContext)) 1536 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 1537 << Name << FixItHint::CreateRemoval(SS.getRange()); 1538 else 1539 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1540 << Name << SS.getRange(); 1541 1542 SS.clear(); 1543 } 1544 1545 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1546 HasDeferredInit, AS); 1547 assert(Member && "HandleField never returns null"); 1548 } else { 1549 assert(!HasDeferredInit); 1550 1551 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1552 if (!Member) { 1553 return 0; 1554 } 1555 1556 // Non-instance-fields can't have a bitfield. 1557 if (BitWidth) { 1558 if (Member->isInvalidDecl()) { 1559 // don't emit another diagnostic. 1560 } else if (isa<VarDecl>(Member)) { 1561 // C++ 9.6p3: A bit-field shall not be a static member. 1562 // "static member 'A' cannot be a bit-field" 1563 Diag(Loc, diag::err_static_not_bitfield) 1564 << Name << BitWidth->getSourceRange(); 1565 } else if (isa<TypedefDecl>(Member)) { 1566 // "typedef member 'x' cannot be a bit-field" 1567 Diag(Loc, diag::err_typedef_not_bitfield) 1568 << Name << BitWidth->getSourceRange(); 1569 } else { 1570 // A function typedef ("typedef int f(); f a;"). 1571 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1572 Diag(Loc, diag::err_not_integral_type_bitfield) 1573 << Name << cast<ValueDecl>(Member)->getType() 1574 << BitWidth->getSourceRange(); 1575 } 1576 1577 BitWidth = 0; 1578 Member->setInvalidDecl(); 1579 } 1580 1581 Member->setAccess(AS); 1582 1583 // If we have declared a member function template, set the access of the 1584 // templated declaration as well. 1585 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1586 FunTmpl->getTemplatedDecl()->setAccess(AS); 1587 } 1588 1589 if (VS.isOverrideSpecified()) { 1590 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1591 if (!MD || !MD->isVirtual()) { 1592 Diag(Member->getLocStart(), 1593 diag::override_keyword_only_allowed_on_virtual_member_functions) 1594 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1595 } else 1596 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1597 } 1598 if (VS.isFinalSpecified()) { 1599 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1600 if (!MD || !MD->isVirtual()) { 1601 Diag(Member->getLocStart(), 1602 diag::override_keyword_only_allowed_on_virtual_member_functions) 1603 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1604 } else 1605 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1606 } 1607 1608 if (VS.getLastLocation().isValid()) { 1609 // Update the end location of a method that has a virt-specifiers. 1610 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1611 MD->setRangeEnd(VS.getLastLocation()); 1612 } 1613 1614 CheckOverrideControl(Member); 1615 1616 assert((Name || isInstField) && "No identifier for non-field ?"); 1617 1618 if (isInstField) 1619 FieldCollector->Add(cast<FieldDecl>(Member)); 1620 return Member; 1621} 1622 1623/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1624/// in-class initializer for a non-static C++ class member, and after 1625/// instantiating an in-class initializer in a class template. Such actions 1626/// are deferred until the class is complete. 1627void 1628Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation EqualLoc, 1629 Expr *InitExpr) { 1630 FieldDecl *FD = cast<FieldDecl>(D); 1631 1632 if (!InitExpr) { 1633 FD->setInvalidDecl(); 1634 FD->removeInClassInitializer(); 1635 return; 1636 } 1637 1638 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1639 FD->setInvalidDecl(); 1640 FD->removeInClassInitializer(); 1641 return; 1642 } 1643 1644 ExprResult Init = InitExpr; 1645 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1646 // FIXME: if there is no EqualLoc, this is list-initialization. 1647 Init = PerformCopyInitialization( 1648 InitializedEntity::InitializeMember(FD), EqualLoc, InitExpr); 1649 if (Init.isInvalid()) { 1650 FD->setInvalidDecl(); 1651 return; 1652 } 1653 1654 CheckImplicitConversions(Init.get(), EqualLoc); 1655 } 1656 1657 // C++0x [class.base.init]p7: 1658 // The initialization of each base and member constitutes a 1659 // full-expression. 1660 Init = MaybeCreateExprWithCleanups(Init); 1661 if (Init.isInvalid()) { 1662 FD->setInvalidDecl(); 1663 return; 1664 } 1665 1666 InitExpr = Init.release(); 1667 1668 FD->setInClassInitializer(InitExpr); 1669} 1670 1671/// \brief Find the direct and/or virtual base specifiers that 1672/// correspond to the given base type, for use in base initialization 1673/// within a constructor. 1674static bool FindBaseInitializer(Sema &SemaRef, 1675 CXXRecordDecl *ClassDecl, 1676 QualType BaseType, 1677 const CXXBaseSpecifier *&DirectBaseSpec, 1678 const CXXBaseSpecifier *&VirtualBaseSpec) { 1679 // First, check for a direct base class. 1680 DirectBaseSpec = 0; 1681 for (CXXRecordDecl::base_class_const_iterator Base 1682 = ClassDecl->bases_begin(); 1683 Base != ClassDecl->bases_end(); ++Base) { 1684 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1685 // We found a direct base of this type. That's what we're 1686 // initializing. 1687 DirectBaseSpec = &*Base; 1688 break; 1689 } 1690 } 1691 1692 // Check for a virtual base class. 1693 // FIXME: We might be able to short-circuit this if we know in advance that 1694 // there are no virtual bases. 1695 VirtualBaseSpec = 0; 1696 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1697 // We haven't found a base yet; search the class hierarchy for a 1698 // virtual base class. 1699 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1700 /*DetectVirtual=*/false); 1701 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1702 BaseType, Paths)) { 1703 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1704 Path != Paths.end(); ++Path) { 1705 if (Path->back().Base->isVirtual()) { 1706 VirtualBaseSpec = Path->back().Base; 1707 break; 1708 } 1709 } 1710 } 1711 } 1712 1713 return DirectBaseSpec || VirtualBaseSpec; 1714} 1715 1716/// \brief Handle a C++ member initializer using braced-init-list syntax. 1717MemInitResult 1718Sema::ActOnMemInitializer(Decl *ConstructorD, 1719 Scope *S, 1720 CXXScopeSpec &SS, 1721 IdentifierInfo *MemberOrBase, 1722 ParsedType TemplateTypeTy, 1723 const DeclSpec &DS, 1724 SourceLocation IdLoc, 1725 Expr *InitList, 1726 SourceLocation EllipsisLoc) { 1727 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1728 DS, IdLoc, InitList, 1729 EllipsisLoc); 1730} 1731 1732/// \brief Handle a C++ member initializer using parentheses syntax. 1733MemInitResult 1734Sema::ActOnMemInitializer(Decl *ConstructorD, 1735 Scope *S, 1736 CXXScopeSpec &SS, 1737 IdentifierInfo *MemberOrBase, 1738 ParsedType TemplateTypeTy, 1739 const DeclSpec &DS, 1740 SourceLocation IdLoc, 1741 SourceLocation LParenLoc, 1742 Expr **Args, unsigned NumArgs, 1743 SourceLocation RParenLoc, 1744 SourceLocation EllipsisLoc) { 1745 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1746 RParenLoc); 1747 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1748 DS, IdLoc, List, EllipsisLoc); 1749} 1750 1751namespace { 1752 1753// Callback to only accept typo corrections that can be a valid C++ member 1754// intializer: either a non-static field member or a base class. 1755class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1756 public: 1757 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1758 : ClassDecl(ClassDecl) {} 1759 1760 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1761 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1762 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1763 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1764 else 1765 return isa<TypeDecl>(ND); 1766 } 1767 return false; 1768 } 1769 1770 private: 1771 CXXRecordDecl *ClassDecl; 1772}; 1773 1774} 1775 1776/// \brief Handle a C++ member initializer. 1777MemInitResult 1778Sema::BuildMemInitializer(Decl *ConstructorD, 1779 Scope *S, 1780 CXXScopeSpec &SS, 1781 IdentifierInfo *MemberOrBase, 1782 ParsedType TemplateTypeTy, 1783 const DeclSpec &DS, 1784 SourceLocation IdLoc, 1785 Expr *Init, 1786 SourceLocation EllipsisLoc) { 1787 if (!ConstructorD) 1788 return true; 1789 1790 AdjustDeclIfTemplate(ConstructorD); 1791 1792 CXXConstructorDecl *Constructor 1793 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1794 if (!Constructor) { 1795 // The user wrote a constructor initializer on a function that is 1796 // not a C++ constructor. Ignore the error for now, because we may 1797 // have more member initializers coming; we'll diagnose it just 1798 // once in ActOnMemInitializers. 1799 return true; 1800 } 1801 1802 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1803 1804 // C++ [class.base.init]p2: 1805 // Names in a mem-initializer-id are looked up in the scope of the 1806 // constructor's class and, if not found in that scope, are looked 1807 // up in the scope containing the constructor's definition. 1808 // [Note: if the constructor's class contains a member with the 1809 // same name as a direct or virtual base class of the class, a 1810 // mem-initializer-id naming the member or base class and composed 1811 // of a single identifier refers to the class member. A 1812 // mem-initializer-id for the hidden base class may be specified 1813 // using a qualified name. ] 1814 if (!SS.getScopeRep() && !TemplateTypeTy) { 1815 // Look for a member, first. 1816 DeclContext::lookup_result Result 1817 = ClassDecl->lookup(MemberOrBase); 1818 if (Result.first != Result.second) { 1819 ValueDecl *Member; 1820 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1821 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1822 if (EllipsisLoc.isValid()) 1823 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1824 << MemberOrBase 1825 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1826 1827 return BuildMemberInitializer(Member, Init, IdLoc); 1828 } 1829 } 1830 } 1831 // It didn't name a member, so see if it names a class. 1832 QualType BaseType; 1833 TypeSourceInfo *TInfo = 0; 1834 1835 if (TemplateTypeTy) { 1836 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1837 } else if (DS.getTypeSpecType() == TST_decltype) { 1838 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1839 } else { 1840 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1841 LookupParsedName(R, S, &SS); 1842 1843 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1844 if (!TyD) { 1845 if (R.isAmbiguous()) return true; 1846 1847 // We don't want access-control diagnostics here. 1848 R.suppressDiagnostics(); 1849 1850 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1851 bool NotUnknownSpecialization = false; 1852 DeclContext *DC = computeDeclContext(SS, false); 1853 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1854 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1855 1856 if (!NotUnknownSpecialization) { 1857 // When the scope specifier can refer to a member of an unknown 1858 // specialization, we take it as a type name. 1859 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1860 SS.getWithLocInContext(Context), 1861 *MemberOrBase, IdLoc); 1862 if (BaseType.isNull()) 1863 return true; 1864 1865 R.clear(); 1866 R.setLookupName(MemberOrBase); 1867 } 1868 } 1869 1870 // If no results were found, try to correct typos. 1871 TypoCorrection Corr; 1872 MemInitializerValidatorCCC Validator(ClassDecl); 1873 if (R.empty() && BaseType.isNull() && 1874 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1875 Validator, ClassDecl))) { 1876 std::string CorrectedStr(Corr.getAsString(getLangOptions())); 1877 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOptions())); 1878 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1879 // We have found a non-static data member with a similar 1880 // name to what was typed; complain and initialize that 1881 // member. 1882 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1883 << MemberOrBase << true << CorrectedQuotedStr 1884 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1885 Diag(Member->getLocation(), diag::note_previous_decl) 1886 << CorrectedQuotedStr; 1887 1888 return BuildMemberInitializer(Member, Init, IdLoc); 1889 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1890 const CXXBaseSpecifier *DirectBaseSpec; 1891 const CXXBaseSpecifier *VirtualBaseSpec; 1892 if (FindBaseInitializer(*this, ClassDecl, 1893 Context.getTypeDeclType(Type), 1894 DirectBaseSpec, VirtualBaseSpec)) { 1895 // We have found a direct or virtual base class with a 1896 // similar name to what was typed; complain and initialize 1897 // that base class. 1898 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1899 << MemberOrBase << false << CorrectedQuotedStr 1900 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1901 1902 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1903 : VirtualBaseSpec; 1904 Diag(BaseSpec->getSourceRange().getBegin(), 1905 diag::note_base_class_specified_here) 1906 << BaseSpec->getType() 1907 << BaseSpec->getSourceRange(); 1908 1909 TyD = Type; 1910 } 1911 } 1912 } 1913 1914 if (!TyD && BaseType.isNull()) { 1915 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1916 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1917 return true; 1918 } 1919 } 1920 1921 if (BaseType.isNull()) { 1922 BaseType = Context.getTypeDeclType(TyD); 1923 if (SS.isSet()) { 1924 NestedNameSpecifier *Qualifier = 1925 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1926 1927 // FIXME: preserve source range information 1928 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1929 } 1930 } 1931 } 1932 1933 if (!TInfo) 1934 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1935 1936 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1937} 1938 1939/// Checks a member initializer expression for cases where reference (or 1940/// pointer) members are bound to by-value parameters (or their addresses). 1941static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1942 Expr *Init, 1943 SourceLocation IdLoc) { 1944 QualType MemberTy = Member->getType(); 1945 1946 // We only handle pointers and references currently. 1947 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1948 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1949 return; 1950 1951 const bool IsPointer = MemberTy->isPointerType(); 1952 if (IsPointer) { 1953 if (const UnaryOperator *Op 1954 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 1955 // The only case we're worried about with pointers requires taking the 1956 // address. 1957 if (Op->getOpcode() != UO_AddrOf) 1958 return; 1959 1960 Init = Op->getSubExpr(); 1961 } else { 1962 // We only handle address-of expression initializers for pointers. 1963 return; 1964 } 1965 } 1966 1967 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 1968 // Taking the address of a temporary will be diagnosed as a hard error. 1969 if (IsPointer) 1970 return; 1971 1972 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 1973 << Member << Init->getSourceRange(); 1974 } else if (const DeclRefExpr *DRE 1975 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 1976 // We only warn when referring to a non-reference parameter declaration. 1977 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 1978 if (!Parameter || Parameter->getType()->isReferenceType()) 1979 return; 1980 1981 S.Diag(Init->getExprLoc(), 1982 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 1983 : diag::warn_bind_ref_member_to_parameter) 1984 << Member << Parameter << Init->getSourceRange(); 1985 } else { 1986 // Other initializers are fine. 1987 return; 1988 } 1989 1990 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 1991 << (unsigned)IsPointer; 1992} 1993 1994/// Checks an initializer expression for use of uninitialized fields, such as 1995/// containing the field that is being initialized. Returns true if there is an 1996/// uninitialized field was used an updates the SourceLocation parameter; false 1997/// otherwise. 1998static bool InitExprContainsUninitializedFields(const Stmt *S, 1999 const ValueDecl *LhsField, 2000 SourceLocation *L) { 2001 assert(isa<FieldDecl>(LhsField) || isa<IndirectFieldDecl>(LhsField)); 2002 2003 if (isa<CallExpr>(S)) { 2004 // Do not descend into function calls or constructors, as the use 2005 // of an uninitialized field may be valid. One would have to inspect 2006 // the contents of the function/ctor to determine if it is safe or not. 2007 // i.e. Pass-by-value is never safe, but pass-by-reference and pointers 2008 // may be safe, depending on what the function/ctor does. 2009 return false; 2010 } 2011 if (const MemberExpr *ME = dyn_cast<MemberExpr>(S)) { 2012 const NamedDecl *RhsField = ME->getMemberDecl(); 2013 2014 if (const VarDecl *VD = dyn_cast<VarDecl>(RhsField)) { 2015 // The member expression points to a static data member. 2016 assert(VD->isStaticDataMember() && 2017 "Member points to non-static data member!"); 2018 (void)VD; 2019 return false; 2020 } 2021 2022 if (isa<EnumConstantDecl>(RhsField)) { 2023 // The member expression points to an enum. 2024 return false; 2025 } 2026 2027 if (RhsField == LhsField) { 2028 // Initializing a field with itself. Throw a warning. 2029 // But wait; there are exceptions! 2030 // Exception #1: The field may not belong to this record. 2031 // e.g. Foo(const Foo& rhs) : A(rhs.A) {} 2032 const Expr *base = ME->getBase(); 2033 if (base != NULL && !isa<CXXThisExpr>(base->IgnoreParenCasts())) { 2034 // Even though the field matches, it does not belong to this record. 2035 return false; 2036 } 2037 // None of the exceptions triggered; return true to indicate an 2038 // uninitialized field was used. 2039 *L = ME->getMemberLoc(); 2040 return true; 2041 } 2042 } else if (isa<UnaryExprOrTypeTraitExpr>(S)) { 2043 // sizeof/alignof doesn't reference contents, do not warn. 2044 return false; 2045 } else if (const UnaryOperator *UOE = dyn_cast<UnaryOperator>(S)) { 2046 // address-of doesn't reference contents (the pointer may be dereferenced 2047 // in the same expression but it would be rare; and weird). 2048 if (UOE->getOpcode() == UO_AddrOf) 2049 return false; 2050 } 2051 for (Stmt::const_child_range it = S->children(); it; ++it) { 2052 if (!*it) { 2053 // An expression such as 'member(arg ?: "")' may trigger this. 2054 continue; 2055 } 2056 if (InitExprContainsUninitializedFields(*it, LhsField, L)) 2057 return true; 2058 } 2059 return false; 2060} 2061 2062MemInitResult 2063Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2064 SourceLocation IdLoc) { 2065 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2066 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2067 assert((DirectMember || IndirectMember) && 2068 "Member must be a FieldDecl or IndirectFieldDecl"); 2069 2070 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2071 return true; 2072 2073 if (Member->isInvalidDecl()) 2074 return true; 2075 2076 // Diagnose value-uses of fields to initialize themselves, e.g. 2077 // foo(foo) 2078 // where foo is not also a parameter to the constructor. 2079 // TODO: implement -Wuninitialized and fold this into that framework. 2080 Expr **Args; 2081 unsigned NumArgs; 2082 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2083 Args = ParenList->getExprs(); 2084 NumArgs = ParenList->getNumExprs(); 2085 } else { 2086 InitListExpr *InitList = cast<InitListExpr>(Init); 2087 Args = InitList->getInits(); 2088 NumArgs = InitList->getNumInits(); 2089 } 2090 for (unsigned i = 0; i < NumArgs; ++i) { 2091 SourceLocation L; 2092 if (InitExprContainsUninitializedFields(Args[i], Member, &L)) { 2093 // FIXME: Return true in the case when other fields are used before being 2094 // uninitialized. For example, let this field be the i'th field. When 2095 // initializing the i'th field, throw a warning if any of the >= i'th 2096 // fields are used, as they are not yet initialized. 2097 // Right now we are only handling the case where the i'th field uses 2098 // itself in its initializer. 2099 Diag(L, diag::warn_field_is_uninit); 2100 } 2101 } 2102 2103 SourceRange InitRange = Init->getSourceRange(); 2104 2105 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2106 // Can't check initialization for a member of dependent type or when 2107 // any of the arguments are type-dependent expressions. 2108 DiscardCleanupsInEvaluationContext(); 2109 } else { 2110 bool InitList = false; 2111 if (isa<InitListExpr>(Init)) { 2112 InitList = true; 2113 Args = &Init; 2114 NumArgs = 1; 2115 } 2116 2117 // Initialize the member. 2118 InitializedEntity MemberEntity = 2119 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2120 : InitializedEntity::InitializeMember(IndirectMember, 0); 2121 InitializationKind Kind = 2122 InitList ? InitializationKind::CreateDirectList(IdLoc) 2123 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2124 InitRange.getEnd()); 2125 2126 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2127 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2128 MultiExprArg(*this, Args, NumArgs), 2129 0); 2130 if (MemberInit.isInvalid()) 2131 return true; 2132 2133 CheckImplicitConversions(MemberInit.get(), 2134 InitRange.getBegin()); 2135 2136 // C++0x [class.base.init]p7: 2137 // The initialization of each base and member constitutes a 2138 // full-expression. 2139 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2140 if (MemberInit.isInvalid()) 2141 return true; 2142 2143 // If we are in a dependent context, template instantiation will 2144 // perform this type-checking again. Just save the arguments that we 2145 // received. 2146 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2147 // of the information that we have about the member 2148 // initializer. However, deconstructing the ASTs is a dicey process, 2149 // and this approach is far more likely to get the corner cases right. 2150 if (CurContext->isDependentContext()) { 2151 // The existing Init will do fine. 2152 } else { 2153 Init = MemberInit.get(); 2154 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2155 } 2156 } 2157 2158 if (DirectMember) { 2159 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2160 InitRange.getBegin(), Init, 2161 InitRange.getEnd()); 2162 } else { 2163 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2164 InitRange.getBegin(), Init, 2165 InitRange.getEnd()); 2166 } 2167} 2168 2169MemInitResult 2170Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2171 CXXRecordDecl *ClassDecl) { 2172 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2173 if (!LangOpts.CPlusPlus0x) 2174 return Diag(NameLoc, diag::err_delegating_ctor) 2175 << TInfo->getTypeLoc().getLocalSourceRange(); 2176 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2177 2178 bool InitList = true; 2179 Expr **Args = &Init; 2180 unsigned NumArgs = 1; 2181 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2182 InitList = false; 2183 Args = ParenList->getExprs(); 2184 NumArgs = ParenList->getNumExprs(); 2185 } 2186 2187 SourceRange InitRange = Init->getSourceRange(); 2188 // Initialize the object. 2189 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2190 QualType(ClassDecl->getTypeForDecl(), 0)); 2191 InitializationKind Kind = 2192 InitList ? InitializationKind::CreateDirectList(NameLoc) 2193 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2194 InitRange.getEnd()); 2195 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2196 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2197 MultiExprArg(*this, Args,NumArgs), 2198 0); 2199 if (DelegationInit.isInvalid()) 2200 return true; 2201 2202 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2203 "Delegating constructor with no target?"); 2204 2205 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2206 2207 // C++0x [class.base.init]p7: 2208 // The initialization of each base and member constitutes a 2209 // full-expression. 2210 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2211 if (DelegationInit.isInvalid()) 2212 return true; 2213 2214 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2215 DelegationInit.takeAs<Expr>(), 2216 InitRange.getEnd()); 2217} 2218 2219MemInitResult 2220Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2221 Expr *Init, CXXRecordDecl *ClassDecl, 2222 SourceLocation EllipsisLoc) { 2223 SourceLocation BaseLoc 2224 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2225 2226 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2227 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2228 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2229 2230 // C++ [class.base.init]p2: 2231 // [...] Unless the mem-initializer-id names a nonstatic data 2232 // member of the constructor's class or a direct or virtual base 2233 // of that class, the mem-initializer is ill-formed. A 2234 // mem-initializer-list can initialize a base class using any 2235 // name that denotes that base class type. 2236 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2237 2238 SourceRange InitRange = Init->getSourceRange(); 2239 if (EllipsisLoc.isValid()) { 2240 // This is a pack expansion. 2241 if (!BaseType->containsUnexpandedParameterPack()) { 2242 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2243 << SourceRange(BaseLoc, InitRange.getEnd()); 2244 2245 EllipsisLoc = SourceLocation(); 2246 } 2247 } else { 2248 // Check for any unexpanded parameter packs. 2249 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2250 return true; 2251 2252 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2253 return true; 2254 } 2255 2256 // Check for direct and virtual base classes. 2257 const CXXBaseSpecifier *DirectBaseSpec = 0; 2258 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2259 if (!Dependent) { 2260 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2261 BaseType)) 2262 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2263 2264 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2265 VirtualBaseSpec); 2266 2267 // C++ [base.class.init]p2: 2268 // Unless the mem-initializer-id names a nonstatic data member of the 2269 // constructor's class or a direct or virtual base of that class, the 2270 // mem-initializer is ill-formed. 2271 if (!DirectBaseSpec && !VirtualBaseSpec) { 2272 // If the class has any dependent bases, then it's possible that 2273 // one of those types will resolve to the same type as 2274 // BaseType. Therefore, just treat this as a dependent base 2275 // class initialization. FIXME: Should we try to check the 2276 // initialization anyway? It seems odd. 2277 if (ClassDecl->hasAnyDependentBases()) 2278 Dependent = true; 2279 else 2280 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2281 << BaseType << Context.getTypeDeclType(ClassDecl) 2282 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2283 } 2284 } 2285 2286 if (Dependent) { 2287 DiscardCleanupsInEvaluationContext(); 2288 2289 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2290 /*IsVirtual=*/false, 2291 InitRange.getBegin(), Init, 2292 InitRange.getEnd(), EllipsisLoc); 2293 } 2294 2295 // C++ [base.class.init]p2: 2296 // If a mem-initializer-id is ambiguous because it designates both 2297 // a direct non-virtual base class and an inherited virtual base 2298 // class, the mem-initializer is ill-formed. 2299 if (DirectBaseSpec && VirtualBaseSpec) 2300 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2301 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2302 2303 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2304 if (!BaseSpec) 2305 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2306 2307 // Initialize the base. 2308 bool InitList = true; 2309 Expr **Args = &Init; 2310 unsigned NumArgs = 1; 2311 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2312 InitList = false; 2313 Args = ParenList->getExprs(); 2314 NumArgs = ParenList->getNumExprs(); 2315 } 2316 2317 InitializedEntity BaseEntity = 2318 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2319 InitializationKind Kind = 2320 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2321 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2322 InitRange.getEnd()); 2323 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2324 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2325 MultiExprArg(*this, Args, NumArgs), 2326 0); 2327 if (BaseInit.isInvalid()) 2328 return true; 2329 2330 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2331 2332 // C++0x [class.base.init]p7: 2333 // The initialization of each base and member constitutes a 2334 // full-expression. 2335 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2336 if (BaseInit.isInvalid()) 2337 return true; 2338 2339 // If we are in a dependent context, template instantiation will 2340 // perform this type-checking again. Just save the arguments that we 2341 // received in a ParenListExpr. 2342 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2343 // of the information that we have about the base 2344 // initializer. However, deconstructing the ASTs is a dicey process, 2345 // and this approach is far more likely to get the corner cases right. 2346 if (CurContext->isDependentContext()) 2347 BaseInit = Owned(Init); 2348 2349 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2350 BaseSpec->isVirtual(), 2351 InitRange.getBegin(), 2352 BaseInit.takeAs<Expr>(), 2353 InitRange.getEnd(), EllipsisLoc); 2354} 2355 2356// Create a static_cast\<T&&>(expr). 2357static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2358 QualType ExprType = E->getType(); 2359 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2360 SourceLocation ExprLoc = E->getLocStart(); 2361 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2362 TargetType, ExprLoc); 2363 2364 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2365 SourceRange(ExprLoc, ExprLoc), 2366 E->getSourceRange()).take(); 2367} 2368 2369/// ImplicitInitializerKind - How an implicit base or member initializer should 2370/// initialize its base or member. 2371enum ImplicitInitializerKind { 2372 IIK_Default, 2373 IIK_Copy, 2374 IIK_Move 2375}; 2376 2377static bool 2378BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2379 ImplicitInitializerKind ImplicitInitKind, 2380 CXXBaseSpecifier *BaseSpec, 2381 bool IsInheritedVirtualBase, 2382 CXXCtorInitializer *&CXXBaseInit) { 2383 InitializedEntity InitEntity 2384 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2385 IsInheritedVirtualBase); 2386 2387 ExprResult BaseInit; 2388 2389 switch (ImplicitInitKind) { 2390 case IIK_Default: { 2391 InitializationKind InitKind 2392 = InitializationKind::CreateDefault(Constructor->getLocation()); 2393 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2394 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2395 MultiExprArg(SemaRef, 0, 0)); 2396 break; 2397 } 2398 2399 case IIK_Move: 2400 case IIK_Copy: { 2401 bool Moving = ImplicitInitKind == IIK_Move; 2402 ParmVarDecl *Param = Constructor->getParamDecl(0); 2403 QualType ParamType = Param->getType().getNonReferenceType(); 2404 2405 Expr *CopyCtorArg = 2406 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2407 SourceLocation(), Param, 2408 Constructor->getLocation(), ParamType, 2409 VK_LValue, 0); 2410 2411 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2412 2413 // Cast to the base class to avoid ambiguities. 2414 QualType ArgTy = 2415 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2416 ParamType.getQualifiers()); 2417 2418 if (Moving) { 2419 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2420 } 2421 2422 CXXCastPath BasePath; 2423 BasePath.push_back(BaseSpec); 2424 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2425 CK_UncheckedDerivedToBase, 2426 Moving ? VK_XValue : VK_LValue, 2427 &BasePath).take(); 2428 2429 InitializationKind InitKind 2430 = InitializationKind::CreateDirect(Constructor->getLocation(), 2431 SourceLocation(), SourceLocation()); 2432 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2433 &CopyCtorArg, 1); 2434 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2435 MultiExprArg(&CopyCtorArg, 1)); 2436 break; 2437 } 2438 } 2439 2440 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2441 if (BaseInit.isInvalid()) 2442 return true; 2443 2444 CXXBaseInit = 2445 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2446 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2447 SourceLocation()), 2448 BaseSpec->isVirtual(), 2449 SourceLocation(), 2450 BaseInit.takeAs<Expr>(), 2451 SourceLocation(), 2452 SourceLocation()); 2453 2454 return false; 2455} 2456 2457static bool RefersToRValueRef(Expr *MemRef) { 2458 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2459 return Referenced->getType()->isRValueReferenceType(); 2460} 2461 2462static bool 2463BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2464 ImplicitInitializerKind ImplicitInitKind, 2465 FieldDecl *Field, IndirectFieldDecl *Indirect, 2466 CXXCtorInitializer *&CXXMemberInit) { 2467 if (Field->isInvalidDecl()) 2468 return true; 2469 2470 SourceLocation Loc = Constructor->getLocation(); 2471 2472 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2473 bool Moving = ImplicitInitKind == IIK_Move; 2474 ParmVarDecl *Param = Constructor->getParamDecl(0); 2475 QualType ParamType = Param->getType().getNonReferenceType(); 2476 2477 // Suppress copying zero-width bitfields. 2478 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2479 return false; 2480 2481 Expr *MemberExprBase = 2482 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2483 SourceLocation(), Param, 2484 Loc, ParamType, VK_LValue, 0); 2485 2486 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2487 2488 if (Moving) { 2489 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2490 } 2491 2492 // Build a reference to this field within the parameter. 2493 CXXScopeSpec SS; 2494 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2495 Sema::LookupMemberName); 2496 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2497 : cast<ValueDecl>(Field), AS_public); 2498 MemberLookup.resolveKind(); 2499 ExprResult CtorArg 2500 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2501 ParamType, Loc, 2502 /*IsArrow=*/false, 2503 SS, 2504 /*TemplateKWLoc=*/SourceLocation(), 2505 /*FirstQualifierInScope=*/0, 2506 MemberLookup, 2507 /*TemplateArgs=*/0); 2508 if (CtorArg.isInvalid()) 2509 return true; 2510 2511 // C++11 [class.copy]p15: 2512 // - if a member m has rvalue reference type T&&, it is direct-initialized 2513 // with static_cast<T&&>(x.m); 2514 if (RefersToRValueRef(CtorArg.get())) { 2515 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2516 } 2517 2518 // When the field we are copying is an array, create index variables for 2519 // each dimension of the array. We use these index variables to subscript 2520 // the source array, and other clients (e.g., CodeGen) will perform the 2521 // necessary iteration with these index variables. 2522 SmallVector<VarDecl *, 4> IndexVariables; 2523 QualType BaseType = Field->getType(); 2524 QualType SizeType = SemaRef.Context.getSizeType(); 2525 bool InitializingArray = false; 2526 while (const ConstantArrayType *Array 2527 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2528 InitializingArray = true; 2529 // Create the iteration variable for this array index. 2530 IdentifierInfo *IterationVarName = 0; 2531 { 2532 SmallString<8> Str; 2533 llvm::raw_svector_ostream OS(Str); 2534 OS << "__i" << IndexVariables.size(); 2535 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2536 } 2537 VarDecl *IterationVar 2538 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2539 IterationVarName, SizeType, 2540 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2541 SC_None, SC_None); 2542 IndexVariables.push_back(IterationVar); 2543 2544 // Create a reference to the iteration variable. 2545 ExprResult IterationVarRef 2546 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2547 assert(!IterationVarRef.isInvalid() && 2548 "Reference to invented variable cannot fail!"); 2549 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2550 assert(!IterationVarRef.isInvalid() && 2551 "Conversion of invented variable cannot fail!"); 2552 2553 // Subscript the array with this iteration variable. 2554 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2555 IterationVarRef.take(), 2556 Loc); 2557 if (CtorArg.isInvalid()) 2558 return true; 2559 2560 BaseType = Array->getElementType(); 2561 } 2562 2563 // The array subscript expression is an lvalue, which is wrong for moving. 2564 if (Moving && InitializingArray) 2565 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2566 2567 // Construct the entity that we will be initializing. For an array, this 2568 // will be first element in the array, which may require several levels 2569 // of array-subscript entities. 2570 SmallVector<InitializedEntity, 4> Entities; 2571 Entities.reserve(1 + IndexVariables.size()); 2572 if (Indirect) 2573 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2574 else 2575 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2576 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2577 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2578 0, 2579 Entities.back())); 2580 2581 // Direct-initialize to use the copy constructor. 2582 InitializationKind InitKind = 2583 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2584 2585 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2586 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2587 &CtorArgE, 1); 2588 2589 ExprResult MemberInit 2590 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2591 MultiExprArg(&CtorArgE, 1)); 2592 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2593 if (MemberInit.isInvalid()) 2594 return true; 2595 2596 if (Indirect) { 2597 assert(IndexVariables.size() == 0 && 2598 "Indirect field improperly initialized"); 2599 CXXMemberInit 2600 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2601 Loc, Loc, 2602 MemberInit.takeAs<Expr>(), 2603 Loc); 2604 } else 2605 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2606 Loc, MemberInit.takeAs<Expr>(), 2607 Loc, 2608 IndexVariables.data(), 2609 IndexVariables.size()); 2610 return false; 2611 } 2612 2613 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2614 2615 QualType FieldBaseElementType = 2616 SemaRef.Context.getBaseElementType(Field->getType()); 2617 2618 if (FieldBaseElementType->isRecordType()) { 2619 InitializedEntity InitEntity 2620 = Indirect? InitializedEntity::InitializeMember(Indirect) 2621 : InitializedEntity::InitializeMember(Field); 2622 InitializationKind InitKind = 2623 InitializationKind::CreateDefault(Loc); 2624 2625 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2626 ExprResult MemberInit = 2627 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2628 2629 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2630 if (MemberInit.isInvalid()) 2631 return true; 2632 2633 if (Indirect) 2634 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2635 Indirect, Loc, 2636 Loc, 2637 MemberInit.get(), 2638 Loc); 2639 else 2640 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2641 Field, Loc, Loc, 2642 MemberInit.get(), 2643 Loc); 2644 return false; 2645 } 2646 2647 if (!Field->getParent()->isUnion()) { 2648 if (FieldBaseElementType->isReferenceType()) { 2649 SemaRef.Diag(Constructor->getLocation(), 2650 diag::err_uninitialized_member_in_ctor) 2651 << (int)Constructor->isImplicit() 2652 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2653 << 0 << Field->getDeclName(); 2654 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2655 return true; 2656 } 2657 2658 if (FieldBaseElementType.isConstQualified()) { 2659 SemaRef.Diag(Constructor->getLocation(), 2660 diag::err_uninitialized_member_in_ctor) 2661 << (int)Constructor->isImplicit() 2662 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2663 << 1 << Field->getDeclName(); 2664 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2665 return true; 2666 } 2667 } 2668 2669 if (SemaRef.getLangOptions().ObjCAutoRefCount && 2670 FieldBaseElementType->isObjCRetainableType() && 2671 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2672 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2673 // Instant objects: 2674 // Default-initialize Objective-C pointers to NULL. 2675 CXXMemberInit 2676 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2677 Loc, Loc, 2678 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2679 Loc); 2680 return false; 2681 } 2682 2683 // Nothing to initialize. 2684 CXXMemberInit = 0; 2685 return false; 2686} 2687 2688namespace { 2689struct BaseAndFieldInfo { 2690 Sema &S; 2691 CXXConstructorDecl *Ctor; 2692 bool AnyErrorsInInits; 2693 ImplicitInitializerKind IIK; 2694 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2695 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2696 2697 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2698 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2699 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2700 if (Generated && Ctor->isCopyConstructor()) 2701 IIK = IIK_Copy; 2702 else if (Generated && Ctor->isMoveConstructor()) 2703 IIK = IIK_Move; 2704 else 2705 IIK = IIK_Default; 2706 } 2707 2708 bool isImplicitCopyOrMove() const { 2709 switch (IIK) { 2710 case IIK_Copy: 2711 case IIK_Move: 2712 return true; 2713 2714 case IIK_Default: 2715 return false; 2716 } 2717 2718 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2719 } 2720}; 2721} 2722 2723/// \brief Determine whether the given indirect field declaration is somewhere 2724/// within an anonymous union. 2725static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2726 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2727 CEnd = F->chain_end(); 2728 C != CEnd; ++C) 2729 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2730 if (Record->isUnion()) 2731 return true; 2732 2733 return false; 2734} 2735 2736/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2737/// array type. 2738static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2739 if (T->isIncompleteArrayType()) 2740 return true; 2741 2742 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2743 if (!ArrayT->getSize()) 2744 return true; 2745 2746 T = ArrayT->getElementType(); 2747 } 2748 2749 return false; 2750} 2751 2752static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2753 FieldDecl *Field, 2754 IndirectFieldDecl *Indirect = 0) { 2755 2756 // Overwhelmingly common case: we have a direct initializer for this field. 2757 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2758 Info.AllToInit.push_back(Init); 2759 return false; 2760 } 2761 2762 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2763 // has a brace-or-equal-initializer, the entity is initialized as specified 2764 // in [dcl.init]. 2765 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2766 CXXCtorInitializer *Init; 2767 if (Indirect) 2768 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2769 SourceLocation(), 2770 SourceLocation(), 0, 2771 SourceLocation()); 2772 else 2773 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2774 SourceLocation(), 2775 SourceLocation(), 0, 2776 SourceLocation()); 2777 Info.AllToInit.push_back(Init); 2778 return false; 2779 } 2780 2781 // Don't build an implicit initializer for union members if none was 2782 // explicitly specified. 2783 if (Field->getParent()->isUnion() || 2784 (Indirect && isWithinAnonymousUnion(Indirect))) 2785 return false; 2786 2787 // Don't initialize incomplete or zero-length arrays. 2788 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2789 return false; 2790 2791 // Don't try to build an implicit initializer if there were semantic 2792 // errors in any of the initializers (and therefore we might be 2793 // missing some that the user actually wrote). 2794 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2795 return false; 2796 2797 CXXCtorInitializer *Init = 0; 2798 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2799 Indirect, Init)) 2800 return true; 2801 2802 if (Init) 2803 Info.AllToInit.push_back(Init); 2804 2805 return false; 2806} 2807 2808bool 2809Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2810 CXXCtorInitializer *Initializer) { 2811 assert(Initializer->isDelegatingInitializer()); 2812 Constructor->setNumCtorInitializers(1); 2813 CXXCtorInitializer **initializer = 2814 new (Context) CXXCtorInitializer*[1]; 2815 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2816 Constructor->setCtorInitializers(initializer); 2817 2818 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2819 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2820 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2821 } 2822 2823 DelegatingCtorDecls.push_back(Constructor); 2824 2825 return false; 2826} 2827 2828bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2829 CXXCtorInitializer **Initializers, 2830 unsigned NumInitializers, 2831 bool AnyErrors) { 2832 if (Constructor->isDependentContext()) { 2833 // Just store the initializers as written, they will be checked during 2834 // instantiation. 2835 if (NumInitializers > 0) { 2836 Constructor->setNumCtorInitializers(NumInitializers); 2837 CXXCtorInitializer **baseOrMemberInitializers = 2838 new (Context) CXXCtorInitializer*[NumInitializers]; 2839 memcpy(baseOrMemberInitializers, Initializers, 2840 NumInitializers * sizeof(CXXCtorInitializer*)); 2841 Constructor->setCtorInitializers(baseOrMemberInitializers); 2842 } 2843 2844 return false; 2845 } 2846 2847 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2848 2849 // We need to build the initializer AST according to order of construction 2850 // and not what user specified in the Initializers list. 2851 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2852 if (!ClassDecl) 2853 return true; 2854 2855 bool HadError = false; 2856 2857 for (unsigned i = 0; i < NumInitializers; i++) { 2858 CXXCtorInitializer *Member = Initializers[i]; 2859 2860 if (Member->isBaseInitializer()) 2861 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2862 else 2863 Info.AllBaseFields[Member->getAnyMember()] = Member; 2864 } 2865 2866 // Keep track of the direct virtual bases. 2867 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2868 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2869 E = ClassDecl->bases_end(); I != E; ++I) { 2870 if (I->isVirtual()) 2871 DirectVBases.insert(I); 2872 } 2873 2874 // Push virtual bases before others. 2875 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2876 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2877 2878 if (CXXCtorInitializer *Value 2879 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2880 Info.AllToInit.push_back(Value); 2881 } else if (!AnyErrors) { 2882 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2883 CXXCtorInitializer *CXXBaseInit; 2884 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2885 VBase, IsInheritedVirtualBase, 2886 CXXBaseInit)) { 2887 HadError = true; 2888 continue; 2889 } 2890 2891 Info.AllToInit.push_back(CXXBaseInit); 2892 } 2893 } 2894 2895 // Non-virtual bases. 2896 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2897 E = ClassDecl->bases_end(); Base != E; ++Base) { 2898 // Virtuals are in the virtual base list and already constructed. 2899 if (Base->isVirtual()) 2900 continue; 2901 2902 if (CXXCtorInitializer *Value 2903 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 2904 Info.AllToInit.push_back(Value); 2905 } else if (!AnyErrors) { 2906 CXXCtorInitializer *CXXBaseInit; 2907 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2908 Base, /*IsInheritedVirtualBase=*/false, 2909 CXXBaseInit)) { 2910 HadError = true; 2911 continue; 2912 } 2913 2914 Info.AllToInit.push_back(CXXBaseInit); 2915 } 2916 } 2917 2918 // Fields. 2919 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 2920 MemEnd = ClassDecl->decls_end(); 2921 Mem != MemEnd; ++Mem) { 2922 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 2923 // C++ [class.bit]p2: 2924 // A declaration for a bit-field that omits the identifier declares an 2925 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 2926 // initialized. 2927 if (F->isUnnamedBitfield()) 2928 continue; 2929 2930 // If we're not generating the implicit copy/move constructor, then we'll 2931 // handle anonymous struct/union fields based on their individual 2932 // indirect fields. 2933 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 2934 continue; 2935 2936 if (CollectFieldInitializer(*this, Info, F)) 2937 HadError = true; 2938 continue; 2939 } 2940 2941 // Beyond this point, we only consider default initialization. 2942 if (Info.IIK != IIK_Default) 2943 continue; 2944 2945 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 2946 if (F->getType()->isIncompleteArrayType()) { 2947 assert(ClassDecl->hasFlexibleArrayMember() && 2948 "Incomplete array type is not valid"); 2949 continue; 2950 } 2951 2952 // Initialize each field of an anonymous struct individually. 2953 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 2954 HadError = true; 2955 2956 continue; 2957 } 2958 } 2959 2960 NumInitializers = Info.AllToInit.size(); 2961 if (NumInitializers > 0) { 2962 Constructor->setNumCtorInitializers(NumInitializers); 2963 CXXCtorInitializer **baseOrMemberInitializers = 2964 new (Context) CXXCtorInitializer*[NumInitializers]; 2965 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 2966 NumInitializers * sizeof(CXXCtorInitializer*)); 2967 Constructor->setCtorInitializers(baseOrMemberInitializers); 2968 2969 // Constructors implicitly reference the base and member 2970 // destructors. 2971 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 2972 Constructor->getParent()); 2973 } 2974 2975 return HadError; 2976} 2977 2978static void *GetKeyForTopLevelField(FieldDecl *Field) { 2979 // For anonymous unions, use the class declaration as the key. 2980 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 2981 if (RT->getDecl()->isAnonymousStructOrUnion()) 2982 return static_cast<void *>(RT->getDecl()); 2983 } 2984 return static_cast<void *>(Field); 2985} 2986 2987static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 2988 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 2989} 2990 2991static void *GetKeyForMember(ASTContext &Context, 2992 CXXCtorInitializer *Member) { 2993 if (!Member->isAnyMemberInitializer()) 2994 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 2995 2996 // For fields injected into the class via declaration of an anonymous union, 2997 // use its anonymous union class declaration as the unique key. 2998 FieldDecl *Field = Member->getAnyMember(); 2999 3000 // If the field is a member of an anonymous struct or union, our key 3001 // is the anonymous record decl that's a direct child of the class. 3002 RecordDecl *RD = Field->getParent(); 3003 if (RD->isAnonymousStructOrUnion()) { 3004 while (true) { 3005 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3006 if (Parent->isAnonymousStructOrUnion()) 3007 RD = Parent; 3008 else 3009 break; 3010 } 3011 3012 return static_cast<void *>(RD); 3013 } 3014 3015 return static_cast<void *>(Field); 3016} 3017 3018static void 3019DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3020 const CXXConstructorDecl *Constructor, 3021 CXXCtorInitializer **Inits, 3022 unsigned NumInits) { 3023 if (Constructor->getDeclContext()->isDependentContext()) 3024 return; 3025 3026 // Don't check initializers order unless the warning is enabled at the 3027 // location of at least one initializer. 3028 bool ShouldCheckOrder = false; 3029 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3030 CXXCtorInitializer *Init = Inits[InitIndex]; 3031 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3032 Init->getSourceLocation()) 3033 != DiagnosticsEngine::Ignored) { 3034 ShouldCheckOrder = true; 3035 break; 3036 } 3037 } 3038 if (!ShouldCheckOrder) 3039 return; 3040 3041 // Build the list of bases and members in the order that they'll 3042 // actually be initialized. The explicit initializers should be in 3043 // this same order but may be missing things. 3044 SmallVector<const void*, 32> IdealInitKeys; 3045 3046 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3047 3048 // 1. Virtual bases. 3049 for (CXXRecordDecl::base_class_const_iterator VBase = 3050 ClassDecl->vbases_begin(), 3051 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3052 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3053 3054 // 2. Non-virtual bases. 3055 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3056 E = ClassDecl->bases_end(); Base != E; ++Base) { 3057 if (Base->isVirtual()) 3058 continue; 3059 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3060 } 3061 3062 // 3. Direct fields. 3063 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3064 E = ClassDecl->field_end(); Field != E; ++Field) { 3065 if (Field->isUnnamedBitfield()) 3066 continue; 3067 3068 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3069 } 3070 3071 unsigned NumIdealInits = IdealInitKeys.size(); 3072 unsigned IdealIndex = 0; 3073 3074 CXXCtorInitializer *PrevInit = 0; 3075 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3076 CXXCtorInitializer *Init = Inits[InitIndex]; 3077 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3078 3079 // Scan forward to try to find this initializer in the idealized 3080 // initializers list. 3081 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3082 if (InitKey == IdealInitKeys[IdealIndex]) 3083 break; 3084 3085 // If we didn't find this initializer, it must be because we 3086 // scanned past it on a previous iteration. That can only 3087 // happen if we're out of order; emit a warning. 3088 if (IdealIndex == NumIdealInits && PrevInit) { 3089 Sema::SemaDiagnosticBuilder D = 3090 SemaRef.Diag(PrevInit->getSourceLocation(), 3091 diag::warn_initializer_out_of_order); 3092 3093 if (PrevInit->isAnyMemberInitializer()) 3094 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3095 else 3096 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3097 3098 if (Init->isAnyMemberInitializer()) 3099 D << 0 << Init->getAnyMember()->getDeclName(); 3100 else 3101 D << 1 << Init->getTypeSourceInfo()->getType(); 3102 3103 // Move back to the initializer's location in the ideal list. 3104 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3105 if (InitKey == IdealInitKeys[IdealIndex]) 3106 break; 3107 3108 assert(IdealIndex != NumIdealInits && 3109 "initializer not found in initializer list"); 3110 } 3111 3112 PrevInit = Init; 3113 } 3114} 3115 3116namespace { 3117bool CheckRedundantInit(Sema &S, 3118 CXXCtorInitializer *Init, 3119 CXXCtorInitializer *&PrevInit) { 3120 if (!PrevInit) { 3121 PrevInit = Init; 3122 return false; 3123 } 3124 3125 if (FieldDecl *Field = Init->getMember()) 3126 S.Diag(Init->getSourceLocation(), 3127 diag::err_multiple_mem_initialization) 3128 << Field->getDeclName() 3129 << Init->getSourceRange(); 3130 else { 3131 const Type *BaseClass = Init->getBaseClass(); 3132 assert(BaseClass && "neither field nor base"); 3133 S.Diag(Init->getSourceLocation(), 3134 diag::err_multiple_base_initialization) 3135 << QualType(BaseClass, 0) 3136 << Init->getSourceRange(); 3137 } 3138 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3139 << 0 << PrevInit->getSourceRange(); 3140 3141 return true; 3142} 3143 3144typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3145typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3146 3147bool CheckRedundantUnionInit(Sema &S, 3148 CXXCtorInitializer *Init, 3149 RedundantUnionMap &Unions) { 3150 FieldDecl *Field = Init->getAnyMember(); 3151 RecordDecl *Parent = Field->getParent(); 3152 NamedDecl *Child = Field; 3153 3154 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3155 if (Parent->isUnion()) { 3156 UnionEntry &En = Unions[Parent]; 3157 if (En.first && En.first != Child) { 3158 S.Diag(Init->getSourceLocation(), 3159 diag::err_multiple_mem_union_initialization) 3160 << Field->getDeclName() 3161 << Init->getSourceRange(); 3162 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3163 << 0 << En.second->getSourceRange(); 3164 return true; 3165 } 3166 if (!En.first) { 3167 En.first = Child; 3168 En.second = Init; 3169 } 3170 if (!Parent->isAnonymousStructOrUnion()) 3171 return false; 3172 } 3173 3174 Child = Parent; 3175 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3176 } 3177 3178 return false; 3179} 3180} 3181 3182/// ActOnMemInitializers - Handle the member initializers for a constructor. 3183void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3184 SourceLocation ColonLoc, 3185 CXXCtorInitializer **meminits, 3186 unsigned NumMemInits, 3187 bool AnyErrors) { 3188 if (!ConstructorDecl) 3189 return; 3190 3191 AdjustDeclIfTemplate(ConstructorDecl); 3192 3193 CXXConstructorDecl *Constructor 3194 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3195 3196 if (!Constructor) { 3197 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3198 return; 3199 } 3200 3201 CXXCtorInitializer **MemInits = 3202 reinterpret_cast<CXXCtorInitializer **>(meminits); 3203 3204 // Mapping for the duplicate initializers check. 3205 // For member initializers, this is keyed with a FieldDecl*. 3206 // For base initializers, this is keyed with a Type*. 3207 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3208 3209 // Mapping for the inconsistent anonymous-union initializers check. 3210 RedundantUnionMap MemberUnions; 3211 3212 bool HadError = false; 3213 for (unsigned i = 0; i < NumMemInits; i++) { 3214 CXXCtorInitializer *Init = MemInits[i]; 3215 3216 // Set the source order index. 3217 Init->setSourceOrder(i); 3218 3219 if (Init->isAnyMemberInitializer()) { 3220 FieldDecl *Field = Init->getAnyMember(); 3221 if (CheckRedundantInit(*this, Init, Members[Field]) || 3222 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3223 HadError = true; 3224 } else if (Init->isBaseInitializer()) { 3225 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3226 if (CheckRedundantInit(*this, Init, Members[Key])) 3227 HadError = true; 3228 } else { 3229 assert(Init->isDelegatingInitializer()); 3230 // This must be the only initializer 3231 if (i != 0 || NumMemInits > 1) { 3232 Diag(MemInits[0]->getSourceLocation(), 3233 diag::err_delegating_initializer_alone) 3234 << MemInits[0]->getSourceRange(); 3235 HadError = true; 3236 // We will treat this as being the only initializer. 3237 } 3238 SetDelegatingInitializer(Constructor, MemInits[i]); 3239 // Return immediately as the initializer is set. 3240 return; 3241 } 3242 } 3243 3244 if (HadError) 3245 return; 3246 3247 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3248 3249 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3250} 3251 3252void 3253Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3254 CXXRecordDecl *ClassDecl) { 3255 // Ignore dependent contexts. Also ignore unions, since their members never 3256 // have destructors implicitly called. 3257 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3258 return; 3259 3260 // FIXME: all the access-control diagnostics are positioned on the 3261 // field/base declaration. That's probably good; that said, the 3262 // user might reasonably want to know why the destructor is being 3263 // emitted, and we currently don't say. 3264 3265 // Non-static data members. 3266 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3267 E = ClassDecl->field_end(); I != E; ++I) { 3268 FieldDecl *Field = *I; 3269 if (Field->isInvalidDecl()) 3270 continue; 3271 3272 // Don't destroy incomplete or zero-length arrays. 3273 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3274 continue; 3275 3276 QualType FieldType = Context.getBaseElementType(Field->getType()); 3277 3278 const RecordType* RT = FieldType->getAs<RecordType>(); 3279 if (!RT) 3280 continue; 3281 3282 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3283 if (FieldClassDecl->isInvalidDecl()) 3284 continue; 3285 if (FieldClassDecl->hasIrrelevantDestructor()) 3286 continue; 3287 3288 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3289 assert(Dtor && "No dtor found for FieldClassDecl!"); 3290 CheckDestructorAccess(Field->getLocation(), Dtor, 3291 PDiag(diag::err_access_dtor_field) 3292 << Field->getDeclName() 3293 << FieldType); 3294 3295 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3296 DiagnoseUseOfDecl(Dtor, Location); 3297 } 3298 3299 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3300 3301 // Bases. 3302 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3303 E = ClassDecl->bases_end(); Base != E; ++Base) { 3304 // Bases are always records in a well-formed non-dependent class. 3305 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3306 3307 // Remember direct virtual bases. 3308 if (Base->isVirtual()) 3309 DirectVirtualBases.insert(RT); 3310 3311 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3312 // If our base class is invalid, we probably can't get its dtor anyway. 3313 if (BaseClassDecl->isInvalidDecl()) 3314 continue; 3315 if (BaseClassDecl->hasIrrelevantDestructor()) 3316 continue; 3317 3318 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3319 assert(Dtor && "No dtor found for BaseClassDecl!"); 3320 3321 // FIXME: caret should be on the start of the class name 3322 CheckDestructorAccess(Base->getSourceRange().getBegin(), Dtor, 3323 PDiag(diag::err_access_dtor_base) 3324 << Base->getType() 3325 << Base->getSourceRange()); 3326 3327 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3328 DiagnoseUseOfDecl(Dtor, Location); 3329 } 3330 3331 // Virtual bases. 3332 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3333 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3334 3335 // Bases are always records in a well-formed non-dependent class. 3336 const RecordType *RT = VBase->getType()->getAs<RecordType>(); 3337 3338 // Ignore direct virtual bases. 3339 if (DirectVirtualBases.count(RT)) 3340 continue; 3341 3342 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3343 // If our base class is invalid, we probably can't get its dtor anyway. 3344 if (BaseClassDecl->isInvalidDecl()) 3345 continue; 3346 if (BaseClassDecl->hasIrrelevantDestructor()) 3347 continue; 3348 3349 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3350 assert(Dtor && "No dtor found for BaseClassDecl!"); 3351 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3352 PDiag(diag::err_access_dtor_vbase) 3353 << VBase->getType()); 3354 3355 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3356 DiagnoseUseOfDecl(Dtor, Location); 3357 } 3358} 3359 3360void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3361 if (!CDtorDecl) 3362 return; 3363 3364 if (CXXConstructorDecl *Constructor 3365 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3366 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3367} 3368 3369bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3370 unsigned DiagID, AbstractDiagSelID SelID) { 3371 if (SelID == -1) 3372 return RequireNonAbstractType(Loc, T, PDiag(DiagID)); 3373 else 3374 return RequireNonAbstractType(Loc, T, PDiag(DiagID) << SelID); 3375} 3376 3377bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3378 const PartialDiagnostic &PD) { 3379 if (!getLangOptions().CPlusPlus) 3380 return false; 3381 3382 if (const ArrayType *AT = Context.getAsArrayType(T)) 3383 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3384 3385 if (const PointerType *PT = T->getAs<PointerType>()) { 3386 // Find the innermost pointer type. 3387 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3388 PT = T; 3389 3390 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3391 return RequireNonAbstractType(Loc, AT->getElementType(), PD); 3392 } 3393 3394 const RecordType *RT = T->getAs<RecordType>(); 3395 if (!RT) 3396 return false; 3397 3398 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3399 3400 // We can't answer whether something is abstract until it has a 3401 // definition. If it's currently being defined, we'll walk back 3402 // over all the declarations when we have a full definition. 3403 const CXXRecordDecl *Def = RD->getDefinition(); 3404 if (!Def || Def->isBeingDefined()) 3405 return false; 3406 3407 if (!RD->isAbstract()) 3408 return false; 3409 3410 Diag(Loc, PD) << RD->getDeclName(); 3411 DiagnoseAbstractType(RD); 3412 3413 return true; 3414} 3415 3416void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3417 // Check if we've already emitted the list of pure virtual functions 3418 // for this class. 3419 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3420 return; 3421 3422 CXXFinalOverriderMap FinalOverriders; 3423 RD->getFinalOverriders(FinalOverriders); 3424 3425 // Keep a set of seen pure methods so we won't diagnose the same method 3426 // more than once. 3427 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3428 3429 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3430 MEnd = FinalOverriders.end(); 3431 M != MEnd; 3432 ++M) { 3433 for (OverridingMethods::iterator SO = M->second.begin(), 3434 SOEnd = M->second.end(); 3435 SO != SOEnd; ++SO) { 3436 // C++ [class.abstract]p4: 3437 // A class is abstract if it contains or inherits at least one 3438 // pure virtual function for which the final overrider is pure 3439 // virtual. 3440 3441 // 3442 if (SO->second.size() != 1) 3443 continue; 3444 3445 if (!SO->second.front().Method->isPure()) 3446 continue; 3447 3448 if (!SeenPureMethods.insert(SO->second.front().Method)) 3449 continue; 3450 3451 Diag(SO->second.front().Method->getLocation(), 3452 diag::note_pure_virtual_function) 3453 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3454 } 3455 } 3456 3457 if (!PureVirtualClassDiagSet) 3458 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3459 PureVirtualClassDiagSet->insert(RD); 3460} 3461 3462namespace { 3463struct AbstractUsageInfo { 3464 Sema &S; 3465 CXXRecordDecl *Record; 3466 CanQualType AbstractType; 3467 bool Invalid; 3468 3469 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3470 : S(S), Record(Record), 3471 AbstractType(S.Context.getCanonicalType( 3472 S.Context.getTypeDeclType(Record))), 3473 Invalid(false) {} 3474 3475 void DiagnoseAbstractType() { 3476 if (Invalid) return; 3477 S.DiagnoseAbstractType(Record); 3478 Invalid = true; 3479 } 3480 3481 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3482}; 3483 3484struct CheckAbstractUsage { 3485 AbstractUsageInfo &Info; 3486 const NamedDecl *Ctx; 3487 3488 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3489 : Info(Info), Ctx(Ctx) {} 3490 3491 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3492 switch (TL.getTypeLocClass()) { 3493#define ABSTRACT_TYPELOC(CLASS, PARENT) 3494#define TYPELOC(CLASS, PARENT) \ 3495 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3496#include "clang/AST/TypeLocNodes.def" 3497 } 3498 } 3499 3500 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3501 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3502 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3503 if (!TL.getArg(I)) 3504 continue; 3505 3506 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3507 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3508 } 3509 } 3510 3511 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3512 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3513 } 3514 3515 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3516 // Visit the type parameters from a permissive context. 3517 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3518 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3519 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3520 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3521 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3522 // TODO: other template argument types? 3523 } 3524 } 3525 3526 // Visit pointee types from a permissive context. 3527#define CheckPolymorphic(Type) \ 3528 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3529 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3530 } 3531 CheckPolymorphic(PointerTypeLoc) 3532 CheckPolymorphic(ReferenceTypeLoc) 3533 CheckPolymorphic(MemberPointerTypeLoc) 3534 CheckPolymorphic(BlockPointerTypeLoc) 3535 CheckPolymorphic(AtomicTypeLoc) 3536 3537 /// Handle all the types we haven't given a more specific 3538 /// implementation for above. 3539 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3540 // Every other kind of type that we haven't called out already 3541 // that has an inner type is either (1) sugar or (2) contains that 3542 // inner type in some way as a subobject. 3543 if (TypeLoc Next = TL.getNextTypeLoc()) 3544 return Visit(Next, Sel); 3545 3546 // If there's no inner type and we're in a permissive context, 3547 // don't diagnose. 3548 if (Sel == Sema::AbstractNone) return; 3549 3550 // Check whether the type matches the abstract type. 3551 QualType T = TL.getType(); 3552 if (T->isArrayType()) { 3553 Sel = Sema::AbstractArrayType; 3554 T = Info.S.Context.getBaseElementType(T); 3555 } 3556 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3557 if (CT != Info.AbstractType) return; 3558 3559 // It matched; do some magic. 3560 if (Sel == Sema::AbstractArrayType) { 3561 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3562 << T << TL.getSourceRange(); 3563 } else { 3564 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3565 << Sel << T << TL.getSourceRange(); 3566 } 3567 Info.DiagnoseAbstractType(); 3568 } 3569}; 3570 3571void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3572 Sema::AbstractDiagSelID Sel) { 3573 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3574} 3575 3576} 3577 3578/// Check for invalid uses of an abstract type in a method declaration. 3579static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3580 CXXMethodDecl *MD) { 3581 // No need to do the check on definitions, which require that 3582 // the return/param types be complete. 3583 if (MD->doesThisDeclarationHaveABody()) 3584 return; 3585 3586 // For safety's sake, just ignore it if we don't have type source 3587 // information. This should never happen for non-implicit methods, 3588 // but... 3589 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3590 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3591} 3592 3593/// Check for invalid uses of an abstract type within a class definition. 3594static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3595 CXXRecordDecl *RD) { 3596 for (CXXRecordDecl::decl_iterator 3597 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3598 Decl *D = *I; 3599 if (D->isImplicit()) continue; 3600 3601 // Methods and method templates. 3602 if (isa<CXXMethodDecl>(D)) { 3603 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3604 } else if (isa<FunctionTemplateDecl>(D)) { 3605 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3606 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3607 3608 // Fields and static variables. 3609 } else if (isa<FieldDecl>(D)) { 3610 FieldDecl *FD = cast<FieldDecl>(D); 3611 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3612 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3613 } else if (isa<VarDecl>(D)) { 3614 VarDecl *VD = cast<VarDecl>(D); 3615 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3616 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3617 3618 // Nested classes and class templates. 3619 } else if (isa<CXXRecordDecl>(D)) { 3620 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3621 } else if (isa<ClassTemplateDecl>(D)) { 3622 CheckAbstractClassUsage(Info, 3623 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3624 } 3625 } 3626} 3627 3628/// \brief Perform semantic checks on a class definition that has been 3629/// completing, introducing implicitly-declared members, checking for 3630/// abstract types, etc. 3631void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3632 if (!Record) 3633 return; 3634 3635 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3636 AbstractUsageInfo Info(*this, Record); 3637 CheckAbstractClassUsage(Info, Record); 3638 } 3639 3640 // If this is not an aggregate type and has no user-declared constructor, 3641 // complain about any non-static data members of reference or const scalar 3642 // type, since they will never get initializers. 3643 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3644 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3645 !Record->isLambda()) { 3646 bool Complained = false; 3647 for (RecordDecl::field_iterator F = Record->field_begin(), 3648 FEnd = Record->field_end(); 3649 F != FEnd; ++F) { 3650 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3651 continue; 3652 3653 if (F->getType()->isReferenceType() || 3654 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3655 if (!Complained) { 3656 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3657 << Record->getTagKind() << Record; 3658 Complained = true; 3659 } 3660 3661 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3662 << F->getType()->isReferenceType() 3663 << F->getDeclName(); 3664 } 3665 } 3666 } 3667 3668 if (Record->isDynamicClass() && !Record->isDependentType()) 3669 DynamicClasses.push_back(Record); 3670 3671 if (Record->getIdentifier()) { 3672 // C++ [class.mem]p13: 3673 // If T is the name of a class, then each of the following shall have a 3674 // name different from T: 3675 // - every member of every anonymous union that is a member of class T. 3676 // 3677 // C++ [class.mem]p14: 3678 // In addition, if class T has a user-declared constructor (12.1), every 3679 // non-static data member of class T shall have a name different from T. 3680 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3681 R.first != R.second; ++R.first) { 3682 NamedDecl *D = *R.first; 3683 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3684 isa<IndirectFieldDecl>(D)) { 3685 Diag(D->getLocation(), diag::err_member_name_of_class) 3686 << D->getDeclName(); 3687 break; 3688 } 3689 } 3690 } 3691 3692 // Warn if the class has virtual methods but non-virtual public destructor. 3693 if (Record->isPolymorphic() && !Record->isDependentType()) { 3694 CXXDestructorDecl *dtor = Record->getDestructor(); 3695 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3696 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3697 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3698 } 3699 3700 // See if a method overloads virtual methods in a base 3701 /// class without overriding any. 3702 if (!Record->isDependentType()) { 3703 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3704 MEnd = Record->method_end(); 3705 M != MEnd; ++M) { 3706 if (!(*M)->isStatic()) 3707 DiagnoseHiddenVirtualMethods(Record, *M); 3708 } 3709 } 3710 3711 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3712 // function that is not a constructor declares that member function to be 3713 // const. [...] The class of which that function is a member shall be 3714 // a literal type. 3715 // 3716 // If the class has virtual bases, any constexpr members will already have 3717 // been diagnosed by the checks performed on the member declaration, so 3718 // suppress this (less useful) diagnostic. 3719 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3720 !Record->isLiteral() && !Record->getNumVBases()) { 3721 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3722 MEnd = Record->method_end(); 3723 M != MEnd; ++M) { 3724 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3725 switch (Record->getTemplateSpecializationKind()) { 3726 case TSK_ImplicitInstantiation: 3727 case TSK_ExplicitInstantiationDeclaration: 3728 case TSK_ExplicitInstantiationDefinition: 3729 // If a template instantiates to a non-literal type, but its members 3730 // instantiate to constexpr functions, the template is technically 3731 // ill-formed, but we allow it for sanity. 3732 continue; 3733 3734 case TSK_Undeclared: 3735 case TSK_ExplicitSpecialization: 3736 RequireLiteralType((*M)->getLocation(), Context.getRecordType(Record), 3737 PDiag(diag::err_constexpr_method_non_literal)); 3738 break; 3739 } 3740 3741 // Only produce one error per class. 3742 break; 3743 } 3744 } 3745 } 3746 3747 // Declare inherited constructors. We do this eagerly here because: 3748 // - The standard requires an eager diagnostic for conflicting inherited 3749 // constructors from different classes. 3750 // - The lazy declaration of the other implicit constructors is so as to not 3751 // waste space and performance on classes that are not meant to be 3752 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3753 // have inherited constructors. 3754 DeclareInheritedConstructors(Record); 3755 3756 if (!Record->isDependentType()) 3757 CheckExplicitlyDefaultedMethods(Record); 3758} 3759 3760void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3761 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3762 ME = Record->method_end(); 3763 MI != ME; ++MI) { 3764 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) { 3765 switch (getSpecialMember(*MI)) { 3766 case CXXDefaultConstructor: 3767 CheckExplicitlyDefaultedDefaultConstructor( 3768 cast<CXXConstructorDecl>(*MI)); 3769 break; 3770 3771 case CXXDestructor: 3772 CheckExplicitlyDefaultedDestructor(cast<CXXDestructorDecl>(*MI)); 3773 break; 3774 3775 case CXXCopyConstructor: 3776 CheckExplicitlyDefaultedCopyConstructor(cast<CXXConstructorDecl>(*MI)); 3777 break; 3778 3779 case CXXCopyAssignment: 3780 CheckExplicitlyDefaultedCopyAssignment(*MI); 3781 break; 3782 3783 case CXXMoveConstructor: 3784 CheckExplicitlyDefaultedMoveConstructor(cast<CXXConstructorDecl>(*MI)); 3785 break; 3786 3787 case CXXMoveAssignment: 3788 CheckExplicitlyDefaultedMoveAssignment(*MI); 3789 break; 3790 3791 case CXXInvalid: 3792 llvm_unreachable("non-special member explicitly defaulted!"); 3793 } 3794 } 3795 } 3796 3797} 3798 3799void Sema::CheckExplicitlyDefaultedDefaultConstructor(CXXConstructorDecl *CD) { 3800 assert(CD->isExplicitlyDefaulted() && CD->isDefaultConstructor()); 3801 3802 // Whether this was the first-declared instance of the constructor. 3803 // This affects whether we implicitly add an exception spec (and, eventually, 3804 // constexpr). It is also ill-formed to explicitly default a constructor such 3805 // that it would be deleted. (C++0x [decl.fct.def.default]) 3806 bool First = CD == CD->getCanonicalDecl(); 3807 3808 bool HadError = false; 3809 if (CD->getNumParams() != 0) { 3810 Diag(CD->getLocation(), diag::err_defaulted_default_ctor_params) 3811 << CD->getSourceRange(); 3812 HadError = true; 3813 } 3814 3815 ImplicitExceptionSpecification Spec 3816 = ComputeDefaultedDefaultCtorExceptionSpec(CD->getParent()); 3817 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3818 if (EPI.ExceptionSpecType == EST_Delayed) { 3819 // Exception specification depends on some deferred part of the class. We'll 3820 // try again when the class's definition has been fully processed. 3821 return; 3822 } 3823 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3824 *ExceptionType = Context.getFunctionType( 3825 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3826 3827 // C++11 [dcl.fct.def.default]p2: 3828 // An explicitly-defaulted function may be declared constexpr only if it 3829 // would have been implicitly declared as constexpr, 3830 // Do not apply this rule to templates, since core issue 1358 makes such 3831 // functions always instantiate to constexpr functions. 3832 if (CD->isConstexpr() && 3833 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3834 if (!CD->getParent()->defaultedDefaultConstructorIsConstexpr()) { 3835 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3836 << CXXDefaultConstructor; 3837 HadError = true; 3838 } 3839 } 3840 // and may have an explicit exception-specification only if it is compatible 3841 // with the exception-specification on the implicit declaration. 3842 if (CtorType->hasExceptionSpec()) { 3843 if (CheckEquivalentExceptionSpec( 3844 PDiag(diag::err_incorrect_defaulted_exception_spec) 3845 << CXXDefaultConstructor, 3846 PDiag(), 3847 ExceptionType, SourceLocation(), 3848 CtorType, CD->getLocation())) { 3849 HadError = true; 3850 } 3851 } 3852 3853 // If a function is explicitly defaulted on its first declaration, 3854 if (First) { 3855 // -- it is implicitly considered to be constexpr if the implicit 3856 // definition would be, 3857 CD->setConstexpr(CD->getParent()->defaultedDefaultConstructorIsConstexpr()); 3858 3859 // -- it is implicitly considered to have the same 3860 // exception-specification as if it had been implicitly declared 3861 // 3862 // FIXME: a compatible, but different, explicit exception specification 3863 // will be silently overridden. We should issue a warning if this happens. 3864 EPI.ExtInfo = CtorType->getExtInfo(); 3865 } 3866 3867 if (HadError) { 3868 CD->setInvalidDecl(); 3869 return; 3870 } 3871 3872 if (ShouldDeleteSpecialMember(CD, CXXDefaultConstructor)) { 3873 if (First) { 3874 CD->setDeletedAsWritten(); 3875 } else { 3876 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3877 << CXXDefaultConstructor; 3878 CD->setInvalidDecl(); 3879 } 3880 } 3881} 3882 3883void Sema::CheckExplicitlyDefaultedCopyConstructor(CXXConstructorDecl *CD) { 3884 assert(CD->isExplicitlyDefaulted() && CD->isCopyConstructor()); 3885 3886 // Whether this was the first-declared instance of the constructor. 3887 bool First = CD == CD->getCanonicalDecl(); 3888 3889 bool HadError = false; 3890 if (CD->getNumParams() != 1) { 3891 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_params) 3892 << CD->getSourceRange(); 3893 HadError = true; 3894 } 3895 3896 ImplicitExceptionSpecification Spec(Context); 3897 bool Const; 3898 llvm::tie(Spec, Const) = 3899 ComputeDefaultedCopyCtorExceptionSpecAndConst(CD->getParent()); 3900 3901 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 3902 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 3903 *ExceptionType = Context.getFunctionType( 3904 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 3905 3906 // Check for parameter type matching. 3907 // This is a copy ctor so we know it's a cv-qualified reference to T. 3908 QualType ArgType = CtorType->getArgType(0); 3909 if (ArgType->getPointeeType().isVolatileQualified()) { 3910 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_volatile_param); 3911 HadError = true; 3912 } 3913 if (ArgType->getPointeeType().isConstQualified() && !Const) { 3914 Diag(CD->getLocation(), diag::err_defaulted_copy_ctor_const_param); 3915 HadError = true; 3916 } 3917 3918 // C++11 [dcl.fct.def.default]p2: 3919 // An explicitly-defaulted function may be declared constexpr only if it 3920 // would have been implicitly declared as constexpr, 3921 // Do not apply this rule to templates, since core issue 1358 makes such 3922 // functions always instantiate to constexpr functions. 3923 if (CD->isConstexpr() && 3924 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 3925 if (!CD->getParent()->defaultedCopyConstructorIsConstexpr()) { 3926 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 3927 << CXXCopyConstructor; 3928 HadError = true; 3929 } 3930 } 3931 // and may have an explicit exception-specification only if it is compatible 3932 // with the exception-specification on the implicit declaration. 3933 if (CtorType->hasExceptionSpec()) { 3934 if (CheckEquivalentExceptionSpec( 3935 PDiag(diag::err_incorrect_defaulted_exception_spec) 3936 << CXXCopyConstructor, 3937 PDiag(), 3938 ExceptionType, SourceLocation(), 3939 CtorType, CD->getLocation())) { 3940 HadError = true; 3941 } 3942 } 3943 3944 // If a function is explicitly defaulted on its first declaration, 3945 if (First) { 3946 // -- it is implicitly considered to be constexpr if the implicit 3947 // definition would be, 3948 CD->setConstexpr(CD->getParent()->defaultedCopyConstructorIsConstexpr()); 3949 3950 // -- it is implicitly considered to have the same 3951 // exception-specification as if it had been implicitly declared, and 3952 // 3953 // FIXME: a compatible, but different, explicit exception specification 3954 // will be silently overridden. We should issue a warning if this happens. 3955 EPI.ExtInfo = CtorType->getExtInfo(); 3956 3957 // -- [...] it shall have the same parameter type as if it had been 3958 // implicitly declared. 3959 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 3960 } 3961 3962 if (HadError) { 3963 CD->setInvalidDecl(); 3964 return; 3965 } 3966 3967 if (ShouldDeleteSpecialMember(CD, CXXCopyConstructor)) { 3968 if (First) { 3969 CD->setDeletedAsWritten(); 3970 } else { 3971 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 3972 << CXXCopyConstructor; 3973 CD->setInvalidDecl(); 3974 } 3975 } 3976} 3977 3978void Sema::CheckExplicitlyDefaultedCopyAssignment(CXXMethodDecl *MD) { 3979 assert(MD->isExplicitlyDefaulted()); 3980 3981 // Whether this was the first-declared instance of the operator 3982 bool First = MD == MD->getCanonicalDecl(); 3983 3984 bool HadError = false; 3985 if (MD->getNumParams() != 1) { 3986 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_params) 3987 << MD->getSourceRange(); 3988 HadError = true; 3989 } 3990 3991 QualType ReturnType = 3992 MD->getType()->getAs<FunctionType>()->getResultType(); 3993 if (!ReturnType->isLValueReferenceType() || 3994 !Context.hasSameType( 3995 Context.getCanonicalType(ReturnType->getPointeeType()), 3996 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 3997 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_return_type); 3998 HadError = true; 3999 } 4000 4001 ImplicitExceptionSpecification Spec(Context); 4002 bool Const; 4003 llvm::tie(Spec, Const) = 4004 ComputeDefaultedCopyCtorExceptionSpecAndConst(MD->getParent()); 4005 4006 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4007 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4008 *ExceptionType = Context.getFunctionType( 4009 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4010 4011 QualType ArgType = OperType->getArgType(0); 4012 if (!ArgType->isLValueReferenceType()) { 4013 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4014 HadError = true; 4015 } else { 4016 if (ArgType->getPointeeType().isVolatileQualified()) { 4017 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_volatile_param); 4018 HadError = true; 4019 } 4020 if (ArgType->getPointeeType().isConstQualified() && !Const) { 4021 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_const_param); 4022 HadError = true; 4023 } 4024 } 4025 4026 if (OperType->getTypeQuals()) { 4027 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_quals); 4028 HadError = true; 4029 } 4030 4031 if (OperType->hasExceptionSpec()) { 4032 if (CheckEquivalentExceptionSpec( 4033 PDiag(diag::err_incorrect_defaulted_exception_spec) 4034 << CXXCopyAssignment, 4035 PDiag(), 4036 ExceptionType, SourceLocation(), 4037 OperType, MD->getLocation())) { 4038 HadError = true; 4039 } 4040 } 4041 if (First) { 4042 // We set the declaration to have the computed exception spec here. 4043 // We duplicate the one parameter type. 4044 EPI.RefQualifier = OperType->getRefQualifier(); 4045 EPI.ExtInfo = OperType->getExtInfo(); 4046 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4047 } 4048 4049 if (HadError) { 4050 MD->setInvalidDecl(); 4051 return; 4052 } 4053 4054 if (ShouldDeleteSpecialMember(MD, CXXCopyAssignment)) { 4055 if (First) { 4056 MD->setDeletedAsWritten(); 4057 } else { 4058 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4059 << CXXCopyAssignment; 4060 MD->setInvalidDecl(); 4061 } 4062 } 4063} 4064 4065void Sema::CheckExplicitlyDefaultedMoveConstructor(CXXConstructorDecl *CD) { 4066 assert(CD->isExplicitlyDefaulted() && CD->isMoveConstructor()); 4067 4068 // Whether this was the first-declared instance of the constructor. 4069 bool First = CD == CD->getCanonicalDecl(); 4070 4071 bool HadError = false; 4072 if (CD->getNumParams() != 1) { 4073 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_params) 4074 << CD->getSourceRange(); 4075 HadError = true; 4076 } 4077 4078 ImplicitExceptionSpecification Spec( 4079 ComputeDefaultedMoveCtorExceptionSpec(CD->getParent())); 4080 4081 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4082 const FunctionProtoType *CtorType = CD->getType()->getAs<FunctionProtoType>(), 4083 *ExceptionType = Context.getFunctionType( 4084 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4085 4086 // Check for parameter type matching. 4087 // This is a move ctor so we know it's a cv-qualified rvalue reference to T. 4088 QualType ArgType = CtorType->getArgType(0); 4089 if (ArgType->getPointeeType().isVolatileQualified()) { 4090 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_volatile_param); 4091 HadError = true; 4092 } 4093 if (ArgType->getPointeeType().isConstQualified()) { 4094 Diag(CD->getLocation(), diag::err_defaulted_move_ctor_const_param); 4095 HadError = true; 4096 } 4097 4098 // C++11 [dcl.fct.def.default]p2: 4099 // An explicitly-defaulted function may be declared constexpr only if it 4100 // would have been implicitly declared as constexpr, 4101 // Do not apply this rule to templates, since core issue 1358 makes such 4102 // functions always instantiate to constexpr functions. 4103 if (CD->isConstexpr() && 4104 CD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4105 if (!CD->getParent()->defaultedMoveConstructorIsConstexpr()) { 4106 Diag(CD->getLocStart(), diag::err_incorrect_defaulted_constexpr) 4107 << CXXMoveConstructor; 4108 HadError = true; 4109 } 4110 } 4111 // and may have an explicit exception-specification only if it is compatible 4112 // with the exception-specification on the implicit declaration. 4113 if (CtorType->hasExceptionSpec()) { 4114 if (CheckEquivalentExceptionSpec( 4115 PDiag(diag::err_incorrect_defaulted_exception_spec) 4116 << CXXMoveConstructor, 4117 PDiag(), 4118 ExceptionType, SourceLocation(), 4119 CtorType, CD->getLocation())) { 4120 HadError = true; 4121 } 4122 } 4123 4124 // If a function is explicitly defaulted on its first declaration, 4125 if (First) { 4126 // -- it is implicitly considered to be constexpr if the implicit 4127 // definition would be, 4128 CD->setConstexpr(CD->getParent()->defaultedMoveConstructorIsConstexpr()); 4129 4130 // -- it is implicitly considered to have the same 4131 // exception-specification as if it had been implicitly declared, and 4132 // 4133 // FIXME: a compatible, but different, explicit exception specification 4134 // will be silently overridden. We should issue a warning if this happens. 4135 EPI.ExtInfo = CtorType->getExtInfo(); 4136 4137 // -- [...] it shall have the same parameter type as if it had been 4138 // implicitly declared. 4139 CD->setType(Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 4140 } 4141 4142 if (HadError) { 4143 CD->setInvalidDecl(); 4144 return; 4145 } 4146 4147 if (ShouldDeleteSpecialMember(CD, CXXMoveConstructor)) { 4148 if (First) { 4149 CD->setDeletedAsWritten(); 4150 } else { 4151 Diag(CD->getLocation(), diag::err_out_of_line_default_deletes) 4152 << CXXMoveConstructor; 4153 CD->setInvalidDecl(); 4154 } 4155 } 4156} 4157 4158void Sema::CheckExplicitlyDefaultedMoveAssignment(CXXMethodDecl *MD) { 4159 assert(MD->isExplicitlyDefaulted()); 4160 4161 // Whether this was the first-declared instance of the operator 4162 bool First = MD == MD->getCanonicalDecl(); 4163 4164 bool HadError = false; 4165 if (MD->getNumParams() != 1) { 4166 Diag(MD->getLocation(), diag::err_defaulted_move_assign_params) 4167 << MD->getSourceRange(); 4168 HadError = true; 4169 } 4170 4171 QualType ReturnType = 4172 MD->getType()->getAs<FunctionType>()->getResultType(); 4173 if (!ReturnType->isLValueReferenceType() || 4174 !Context.hasSameType( 4175 Context.getCanonicalType(ReturnType->getPointeeType()), 4176 Context.getCanonicalType(Context.getTypeDeclType(MD->getParent())))) { 4177 Diag(MD->getLocation(), diag::err_defaulted_move_assign_return_type); 4178 HadError = true; 4179 } 4180 4181 ImplicitExceptionSpecification Spec( 4182 ComputeDefaultedMoveCtorExceptionSpec(MD->getParent())); 4183 4184 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4185 const FunctionProtoType *OperType = MD->getType()->getAs<FunctionProtoType>(), 4186 *ExceptionType = Context.getFunctionType( 4187 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4188 4189 QualType ArgType = OperType->getArgType(0); 4190 if (!ArgType->isRValueReferenceType()) { 4191 Diag(MD->getLocation(), diag::err_defaulted_move_assign_not_ref); 4192 HadError = true; 4193 } else { 4194 if (ArgType->getPointeeType().isVolatileQualified()) { 4195 Diag(MD->getLocation(), diag::err_defaulted_move_assign_volatile_param); 4196 HadError = true; 4197 } 4198 if (ArgType->getPointeeType().isConstQualified()) { 4199 Diag(MD->getLocation(), diag::err_defaulted_move_assign_const_param); 4200 HadError = true; 4201 } 4202 } 4203 4204 if (OperType->getTypeQuals()) { 4205 Diag(MD->getLocation(), diag::err_defaulted_move_assign_quals); 4206 HadError = true; 4207 } 4208 4209 if (OperType->hasExceptionSpec()) { 4210 if (CheckEquivalentExceptionSpec( 4211 PDiag(diag::err_incorrect_defaulted_exception_spec) 4212 << CXXMoveAssignment, 4213 PDiag(), 4214 ExceptionType, SourceLocation(), 4215 OperType, MD->getLocation())) { 4216 HadError = true; 4217 } 4218 } 4219 if (First) { 4220 // We set the declaration to have the computed exception spec here. 4221 // We duplicate the one parameter type. 4222 EPI.RefQualifier = OperType->getRefQualifier(); 4223 EPI.ExtInfo = OperType->getExtInfo(); 4224 MD->setType(Context.getFunctionType(ReturnType, &ArgType, 1, EPI)); 4225 } 4226 4227 if (HadError) { 4228 MD->setInvalidDecl(); 4229 return; 4230 } 4231 4232 if (ShouldDeleteSpecialMember(MD, CXXMoveAssignment)) { 4233 if (First) { 4234 MD->setDeletedAsWritten(); 4235 } else { 4236 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) 4237 << CXXMoveAssignment; 4238 MD->setInvalidDecl(); 4239 } 4240 } 4241} 4242 4243void Sema::CheckExplicitlyDefaultedDestructor(CXXDestructorDecl *DD) { 4244 assert(DD->isExplicitlyDefaulted()); 4245 4246 // Whether this was the first-declared instance of the destructor. 4247 bool First = DD == DD->getCanonicalDecl(); 4248 4249 ImplicitExceptionSpecification Spec 4250 = ComputeDefaultedDtorExceptionSpec(DD->getParent()); 4251 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 4252 const FunctionProtoType *DtorType = DD->getType()->getAs<FunctionProtoType>(), 4253 *ExceptionType = Context.getFunctionType( 4254 Context.VoidTy, 0, 0, EPI)->getAs<FunctionProtoType>(); 4255 4256 if (DtorType->hasExceptionSpec()) { 4257 if (CheckEquivalentExceptionSpec( 4258 PDiag(diag::err_incorrect_defaulted_exception_spec) 4259 << CXXDestructor, 4260 PDiag(), 4261 ExceptionType, SourceLocation(), 4262 DtorType, DD->getLocation())) { 4263 DD->setInvalidDecl(); 4264 return; 4265 } 4266 } 4267 if (First) { 4268 // We set the declaration to have the computed exception spec here. 4269 // There are no parameters. 4270 EPI.ExtInfo = DtorType->getExtInfo(); 4271 DD->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 4272 } 4273 4274 if (ShouldDeleteSpecialMember(DD, CXXDestructor)) { 4275 if (First) { 4276 DD->setDeletedAsWritten(); 4277 } else { 4278 Diag(DD->getLocation(), diag::err_out_of_line_default_deletes) 4279 << CXXDestructor; 4280 DD->setInvalidDecl(); 4281 } 4282 } 4283} 4284 4285namespace { 4286struct SpecialMemberDeletionInfo { 4287 Sema &S; 4288 CXXMethodDecl *MD; 4289 Sema::CXXSpecialMember CSM; 4290 4291 // Properties of the special member, computed for convenience. 4292 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4293 SourceLocation Loc; 4294 4295 bool AllFieldsAreConst; 4296 4297 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4298 Sema::CXXSpecialMember CSM) 4299 : S(S), MD(MD), CSM(CSM), 4300 IsConstructor(false), IsAssignment(false), IsMove(false), 4301 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4302 AllFieldsAreConst(true) { 4303 switch (CSM) { 4304 case Sema::CXXDefaultConstructor: 4305 case Sema::CXXCopyConstructor: 4306 IsConstructor = true; 4307 break; 4308 case Sema::CXXMoveConstructor: 4309 IsConstructor = true; 4310 IsMove = true; 4311 break; 4312 case Sema::CXXCopyAssignment: 4313 IsAssignment = true; 4314 break; 4315 case Sema::CXXMoveAssignment: 4316 IsAssignment = true; 4317 IsMove = true; 4318 break; 4319 case Sema::CXXDestructor: 4320 break; 4321 case Sema::CXXInvalid: 4322 llvm_unreachable("invalid special member kind"); 4323 } 4324 4325 if (MD->getNumParams()) { 4326 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4327 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4328 } 4329 } 4330 4331 bool inUnion() const { return MD->getParent()->isUnion(); } 4332 4333 /// Look up the corresponding special member in the given class. 4334 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4335 unsigned TQ = MD->getTypeQualifiers(); 4336 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4337 MD->getRefQualifier() == RQ_RValue, 4338 TQ & Qualifiers::Const, 4339 TQ & Qualifiers::Volatile); 4340 } 4341 4342 bool shouldDeleteForBase(CXXRecordDecl *BaseDecl, bool IsVirtualBase); 4343 bool shouldDeleteForField(FieldDecl *FD); 4344 bool shouldDeleteForAllConstMembers(); 4345}; 4346} 4347 4348/// Check whether we should delete a special member function due to the class 4349/// having a particular direct or virtual base class. 4350bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXRecordDecl *BaseDecl, 4351 bool IsVirtualBase) { 4352 // C++11 [class.copy]p23: 4353 // -- for the move assignment operator, any direct or indirect virtual 4354 // base class. 4355 if (CSM == Sema::CXXMoveAssignment && IsVirtualBase) 4356 return true; 4357 4358 // C++11 [class.ctor]p5, C++11 [class.copy]p11, C++11 [class.dtor]p5: 4359 // -- any direct or virtual base class [...] has a type with a destructor 4360 // that is deleted or inaccessible 4361 if (!IsAssignment) { 4362 CXXDestructorDecl *BaseDtor = S.LookupDestructor(BaseDecl); 4363 if (BaseDtor->isDeleted()) 4364 return true; 4365 if (S.CheckDestructorAccess(Loc, BaseDtor, S.PDiag()) 4366 != Sema::AR_accessible) 4367 return true; 4368 } 4369 4370 // C++11 [class.ctor]p5: 4371 // -- any direct or virtual base class [...] has class type M [...] and 4372 // either M has no default constructor or overload resolution as applied 4373 // to M's default constructor results in an ambiguity or in a function 4374 // that is deleted or inaccessible 4375 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4376 // -- a direct or virtual base class B that cannot be copied/moved because 4377 // overload resolution, as applied to B's corresponding special member, 4378 // results in an ambiguity or a function that is deleted or inaccessible 4379 // from the defaulted special member 4380 if (CSM != Sema::CXXDestructor) { 4381 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(BaseDecl); 4382 if (!SMOR->hasSuccess()) 4383 return true; 4384 4385 CXXMethodDecl *BaseMember = SMOR->getMethod(); 4386 if (IsConstructor) { 4387 CXXConstructorDecl *BaseCtor = cast<CXXConstructorDecl>(BaseMember); 4388 if (S.CheckConstructorAccess(Loc, BaseCtor, BaseCtor->getAccess(), 4389 S.PDiag()) != Sema::AR_accessible) 4390 return true; 4391 4392 // -- for the move constructor, a [...] direct or virtual base class with 4393 // a type that does not have a move constructor and is not trivially 4394 // copyable. 4395 if (IsMove && !BaseCtor->isMoveConstructor() && 4396 !BaseDecl->isTriviallyCopyable()) 4397 return true; 4398 } else { 4399 assert(IsAssignment && "unexpected kind of special member"); 4400 if (S.CheckDirectMemberAccess(Loc, BaseMember, S.PDiag()) 4401 != Sema::AR_accessible) 4402 return true; 4403 4404 // -- for the move assignment operator, a direct base class with a type 4405 // that does not have a move assignment operator and is not trivially 4406 // copyable. 4407 if (IsMove && !BaseMember->isMoveAssignmentOperator() && 4408 !BaseDecl->isTriviallyCopyable()) 4409 return true; 4410 } 4411 } 4412 4413 // C++11 [class.dtor]p5: 4414 // -- for a virtual destructor, lookup of the non-array deallocation function 4415 // results in an ambiguity or in a function that is deleted or inaccessible 4416 if (CSM == Sema::CXXDestructor && MD->isVirtual()) { 4417 FunctionDecl *OperatorDelete = 0; 4418 DeclarationName Name = 4419 S.Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4420 if (S.FindDeallocationFunction(Loc, MD->getParent(), Name, 4421 OperatorDelete, false)) 4422 return true; 4423 } 4424 4425 return false; 4426} 4427 4428/// Check whether we should delete a special member function due to the class 4429/// having a particular non-static data member. 4430bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4431 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4432 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4433 4434 if (CSM == Sema::CXXDefaultConstructor) { 4435 // For a default constructor, all references must be initialized in-class 4436 // and, if a union, it must have a non-const member. 4437 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) 4438 return true; 4439 4440 if (inUnion() && !FieldType.isConstQualified()) 4441 AllFieldsAreConst = false; 4442 } else if (CSM == Sema::CXXCopyConstructor) { 4443 // For a copy constructor, data members must not be of rvalue reference 4444 // type. 4445 if (FieldType->isRValueReferenceType()) 4446 return true; 4447 } else if (IsAssignment) { 4448 // For an assignment operator, data members must not be of reference type. 4449 if (FieldType->isReferenceType()) 4450 return true; 4451 } 4452 4453 if (FieldRecord) { 4454 // For a default constructor, a const member must have a user-provided 4455 // default constructor or else be explicitly initialized. 4456 if (CSM == Sema::CXXDefaultConstructor && FieldType.isConstQualified() && 4457 !FD->hasInClassInitializer() && 4458 !FieldRecord->hasUserProvidedDefaultConstructor()) 4459 return true; 4460 4461 // Some additional restrictions exist on the variant members. 4462 if (!inUnion() && FieldRecord->isUnion() && 4463 FieldRecord->isAnonymousStructOrUnion()) { 4464 bool AllVariantFieldsAreConst = true; 4465 4466 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4467 UE = FieldRecord->field_end(); 4468 UI != UE; ++UI) { 4469 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4470 CXXRecordDecl *UnionFieldRecord = 4471 UnionFieldType->getAsCXXRecordDecl(); 4472 4473 if (!UnionFieldType.isConstQualified()) 4474 AllVariantFieldsAreConst = false; 4475 4476 if (UnionFieldRecord) { 4477 // FIXME: Checking for accessibility and validity of this 4478 // destructor is technically going beyond the 4479 // standard, but this is believed to be a defect. 4480 if (!IsAssignment) { 4481 CXXDestructorDecl *FieldDtor = S.LookupDestructor(UnionFieldRecord); 4482 if (FieldDtor->isDeleted()) 4483 return true; 4484 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4485 Sema::AR_accessible) 4486 return true; 4487 if (!FieldDtor->isTrivial()) 4488 return true; 4489 } 4490 4491 // FIXME: in-class initializers should be handled here 4492 if (CSM != Sema::CXXDestructor) { 4493 Sema::SpecialMemberOverloadResult *SMOR = 4494 lookupIn(UnionFieldRecord); 4495 // FIXME: Checking for accessibility and validity of this 4496 // corresponding member is technically going beyond the 4497 // standard, but this is believed to be a defect. 4498 if (!SMOR->hasSuccess()) 4499 return true; 4500 4501 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4502 // A member of a union must have a trivial corresponding 4503 // special member. 4504 if (!FieldMember->isTrivial()) 4505 return true; 4506 4507 if (IsConstructor) { 4508 CXXConstructorDecl *FieldCtor = 4509 cast<CXXConstructorDecl>(FieldMember); 4510 if (S.CheckConstructorAccess(Loc, FieldCtor, 4511 FieldCtor->getAccess(), 4512 S.PDiag()) != Sema::AR_accessible) 4513 return true; 4514 } else { 4515 assert(IsAssignment && "unexpected kind of special member"); 4516 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4517 != Sema::AR_accessible) 4518 return true; 4519 } 4520 } 4521 } 4522 } 4523 4524 // At least one member in each anonymous union must be non-const 4525 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst) 4526 return true; 4527 4528 // Don't try to initialize the anonymous union 4529 // This is technically non-conformant, but sanity demands it. 4530 return false; 4531 } 4532 4533 // Unless we're doing assignment, the field's destructor must be 4534 // accessible and not deleted. 4535 if (!IsAssignment) { 4536 CXXDestructorDecl *FieldDtor = S.LookupDestructor(FieldRecord); 4537 if (FieldDtor->isDeleted()) 4538 return true; 4539 if (S.CheckDestructorAccess(Loc, FieldDtor, S.PDiag()) != 4540 Sema::AR_accessible) 4541 return true; 4542 } 4543 4544 // Check that the corresponding member of the field is accessible, 4545 // unique, and non-deleted. We don't do this if it has an explicit 4546 // initialization when default-constructing. 4547 if (CSM != Sema::CXXDestructor && 4548 !(CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer())) { 4549 Sema::SpecialMemberOverloadResult *SMOR = lookupIn(FieldRecord); 4550 if (!SMOR->hasSuccess()) 4551 return true; 4552 4553 CXXMethodDecl *FieldMember = SMOR->getMethod(); 4554 if (IsConstructor) { 4555 CXXConstructorDecl *FieldCtor = cast<CXXConstructorDecl>(FieldMember); 4556 if (S.CheckConstructorAccess(Loc, FieldCtor, FieldCtor->getAccess(), 4557 S.PDiag()) != Sema::AR_accessible) 4558 return true; 4559 4560 // For a move operation, the corresponding operation must actually 4561 // be a move operation (and not a copy selected by overload 4562 // resolution) unless we are working on a trivially copyable class. 4563 if (IsMove && !FieldCtor->isMoveConstructor() && 4564 !FieldRecord->isTriviallyCopyable()) 4565 return true; 4566 } else { 4567 assert(IsAssignment && "unexpected kind of special member"); 4568 if (S.CheckDirectMemberAccess(Loc, FieldMember, S.PDiag()) 4569 != Sema::AR_accessible) 4570 return true; 4571 4572 // -- for the move assignment operator, a non-static data member with a 4573 // type that does not have a move assignment operator and is not 4574 // trivially copyable. 4575 if (IsMove && !FieldMember->isMoveAssignmentOperator() && 4576 !FieldRecord->isTriviallyCopyable()) 4577 return true; 4578 } 4579 4580 // We need the corresponding member of a union to be trivial so that 4581 // we can safely copy them all simultaneously. 4582 // FIXME: Note that performing the check here (where we rely on the lack 4583 // of an in-class initializer) is technically ill-formed. However, this 4584 // seems most obviously to be a bug in the standard. 4585 if (inUnion() && !FieldMember->isTrivial()) 4586 return true; 4587 } 4588 } else if (CSM == Sema::CXXDefaultConstructor && !inUnion() && 4589 FieldType.isConstQualified() && !FD->hasInClassInitializer()) { 4590 // We can't initialize a const member of non-class type to any value. 4591 return true; 4592 } else if (IsAssignment && FieldType.isConstQualified()) { 4593 // C++11 [class.copy]p23: 4594 // -- a non-static data member of const non-class type (or array thereof) 4595 return true; 4596 } 4597 4598 return false; 4599} 4600 4601/// C++11 [class.ctor] p5: 4602/// A defaulted default constructor for a class X is defined as deleted if 4603/// X is a union and all of its variant members are of const-qualified type. 4604bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4605 return CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst; 4606} 4607 4608/// Determine whether a defaulted special member function should be defined as 4609/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4610/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4611bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM) { 4612 assert(!MD->isInvalidDecl()); 4613 CXXRecordDecl *RD = MD->getParent(); 4614 assert(!RD->isDependentType() && "do deletion after instantiation"); 4615 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4616 return false; 4617 4618 // C++11 [expr.lambda.prim]p19: 4619 // The closure type associated with a lambda-expression has a 4620 // deleted (8.4.3) default constructor and a deleted copy 4621 // assignment operator. 4622 if (RD->isLambda() && 4623 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) 4624 return true; 4625 4626 // For an anonymous struct or union, the copy and assignment special members 4627 // will never be used, so skip the check. For an anonymous union declared at 4628 // namespace scope, the constructor and destructor are used. 4629 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4630 RD->isAnonymousStructOrUnion()) 4631 return false; 4632 4633 // Do access control from the special member function 4634 ContextRAII MethodContext(*this, MD); 4635 4636 SpecialMemberDeletionInfo SMI(*this, MD, CSM); 4637 4638 // FIXME: We should put some diagnostic logic right into this function. 4639 4640 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4641 BE = RD->bases_end(); BI != BE; ++BI) 4642 if (!BI->isVirtual() && 4643 SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), false)) 4644 return true; 4645 4646 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4647 BE = RD->vbases_end(); BI != BE; ++BI) 4648 if (SMI.shouldDeleteForBase(BI->getType()->getAsCXXRecordDecl(), true)) 4649 return true; 4650 4651 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4652 FE = RD->field_end(); FI != FE; ++FI) 4653 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4654 SMI.shouldDeleteForField(*FI)) 4655 return true; 4656 4657 if (SMI.shouldDeleteForAllConstMembers()) 4658 return true; 4659 4660 return false; 4661} 4662 4663/// \brief Data used with FindHiddenVirtualMethod 4664namespace { 4665 struct FindHiddenVirtualMethodData { 4666 Sema *S; 4667 CXXMethodDecl *Method; 4668 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4669 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4670 }; 4671} 4672 4673/// \brief Member lookup function that determines whether a given C++ 4674/// method overloads virtual methods in a base class without overriding any, 4675/// to be used with CXXRecordDecl::lookupInBases(). 4676static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4677 CXXBasePath &Path, 4678 void *UserData) { 4679 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4680 4681 FindHiddenVirtualMethodData &Data 4682 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4683 4684 DeclarationName Name = Data.Method->getDeclName(); 4685 assert(Name.getNameKind() == DeclarationName::Identifier); 4686 4687 bool foundSameNameMethod = false; 4688 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4689 for (Path.Decls = BaseRecord->lookup(Name); 4690 Path.Decls.first != Path.Decls.second; 4691 ++Path.Decls.first) { 4692 NamedDecl *D = *Path.Decls.first; 4693 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4694 MD = MD->getCanonicalDecl(); 4695 foundSameNameMethod = true; 4696 // Interested only in hidden virtual methods. 4697 if (!MD->isVirtual()) 4698 continue; 4699 // If the method we are checking overrides a method from its base 4700 // don't warn about the other overloaded methods. 4701 if (!Data.S->IsOverload(Data.Method, MD, false)) 4702 return true; 4703 // Collect the overload only if its hidden. 4704 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4705 overloadedMethods.push_back(MD); 4706 } 4707 } 4708 4709 if (foundSameNameMethod) 4710 Data.OverloadedMethods.append(overloadedMethods.begin(), 4711 overloadedMethods.end()); 4712 return foundSameNameMethod; 4713} 4714 4715/// \brief See if a method overloads virtual methods in a base class without 4716/// overriding any. 4717void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4718 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4719 MD->getLocation()) == DiagnosticsEngine::Ignored) 4720 return; 4721 if (MD->getDeclName().getNameKind() != DeclarationName::Identifier) 4722 return; 4723 4724 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4725 /*bool RecordPaths=*/false, 4726 /*bool DetectVirtual=*/false); 4727 FindHiddenVirtualMethodData Data; 4728 Data.Method = MD; 4729 Data.S = this; 4730 4731 // Keep the base methods that were overriden or introduced in the subclass 4732 // by 'using' in a set. A base method not in this set is hidden. 4733 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4734 res.first != res.second; ++res.first) { 4735 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4736 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4737 E = MD->end_overridden_methods(); 4738 I != E; ++I) 4739 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4740 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4741 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4742 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4743 } 4744 4745 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4746 !Data.OverloadedMethods.empty()) { 4747 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4748 << MD << (Data.OverloadedMethods.size() > 1); 4749 4750 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4751 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4752 Diag(overloadedMD->getLocation(), 4753 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4754 } 4755 } 4756} 4757 4758void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4759 Decl *TagDecl, 4760 SourceLocation LBrac, 4761 SourceLocation RBrac, 4762 AttributeList *AttrList) { 4763 if (!TagDecl) 4764 return; 4765 4766 AdjustDeclIfTemplate(TagDecl); 4767 4768 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4769 // strict aliasing violation! 4770 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4771 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4772 4773 CheckCompletedCXXClass( 4774 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4775} 4776 4777/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4778/// special functions, such as the default constructor, copy 4779/// constructor, or destructor, to the given C++ class (C++ 4780/// [special]p1). This routine can only be executed just before the 4781/// definition of the class is complete. 4782void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4783 if (!ClassDecl->hasUserDeclaredConstructor()) 4784 ++ASTContext::NumImplicitDefaultConstructors; 4785 4786 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4787 ++ASTContext::NumImplicitCopyConstructors; 4788 4789 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4790 ++ASTContext::NumImplicitMoveConstructors; 4791 4792 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4793 ++ASTContext::NumImplicitCopyAssignmentOperators; 4794 4795 // If we have a dynamic class, then the copy assignment operator may be 4796 // virtual, so we have to declare it immediately. This ensures that, e.g., 4797 // it shows up in the right place in the vtable and that we diagnose 4798 // problems with the implicit exception specification. 4799 if (ClassDecl->isDynamicClass()) 4800 DeclareImplicitCopyAssignment(ClassDecl); 4801 } 4802 4803 if (getLangOptions().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()){ 4804 ++ASTContext::NumImplicitMoveAssignmentOperators; 4805 4806 // Likewise for the move assignment operator. 4807 if (ClassDecl->isDynamicClass()) 4808 DeclareImplicitMoveAssignment(ClassDecl); 4809 } 4810 4811 if (!ClassDecl->hasUserDeclaredDestructor()) { 4812 ++ASTContext::NumImplicitDestructors; 4813 4814 // If we have a dynamic class, then the destructor may be virtual, so we 4815 // have to declare the destructor immediately. This ensures that, e.g., it 4816 // shows up in the right place in the vtable and that we diagnose problems 4817 // with the implicit exception specification. 4818 if (ClassDecl->isDynamicClass()) 4819 DeclareImplicitDestructor(ClassDecl); 4820 } 4821} 4822 4823void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4824 if (!D) 4825 return; 4826 4827 int NumParamList = D->getNumTemplateParameterLists(); 4828 for (int i = 0; i < NumParamList; i++) { 4829 TemplateParameterList* Params = D->getTemplateParameterList(i); 4830 for (TemplateParameterList::iterator Param = Params->begin(), 4831 ParamEnd = Params->end(); 4832 Param != ParamEnd; ++Param) { 4833 NamedDecl *Named = cast<NamedDecl>(*Param); 4834 if (Named->getDeclName()) { 4835 S->AddDecl(Named); 4836 IdResolver.AddDecl(Named); 4837 } 4838 } 4839 } 4840} 4841 4842void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4843 if (!D) 4844 return; 4845 4846 TemplateParameterList *Params = 0; 4847 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4848 Params = Template->getTemplateParameters(); 4849 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4850 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4851 Params = PartialSpec->getTemplateParameters(); 4852 else 4853 return; 4854 4855 for (TemplateParameterList::iterator Param = Params->begin(), 4856 ParamEnd = Params->end(); 4857 Param != ParamEnd; ++Param) { 4858 NamedDecl *Named = cast<NamedDecl>(*Param); 4859 if (Named->getDeclName()) { 4860 S->AddDecl(Named); 4861 IdResolver.AddDecl(Named); 4862 } 4863 } 4864} 4865 4866void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4867 if (!RecordD) return; 4868 AdjustDeclIfTemplate(RecordD); 4869 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4870 PushDeclContext(S, Record); 4871} 4872 4873void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4874 if (!RecordD) return; 4875 PopDeclContext(); 4876} 4877 4878/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4879/// parsing a top-level (non-nested) C++ class, and we are now 4880/// parsing those parts of the given Method declaration that could 4881/// not be parsed earlier (C++ [class.mem]p2), such as default 4882/// arguments. This action should enter the scope of the given 4883/// Method declaration as if we had just parsed the qualified method 4884/// name. However, it should not bring the parameters into scope; 4885/// that will be performed by ActOnDelayedCXXMethodParameter. 4886void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4887} 4888 4889/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4890/// C++ method declaration. We're (re-)introducing the given 4891/// function parameter into scope for use in parsing later parts of 4892/// the method declaration. For example, we could see an 4893/// ActOnParamDefaultArgument event for this parameter. 4894void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4895 if (!ParamD) 4896 return; 4897 4898 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4899 4900 // If this parameter has an unparsed default argument, clear it out 4901 // to make way for the parsed default argument. 4902 if (Param->hasUnparsedDefaultArg()) 4903 Param->setDefaultArg(0); 4904 4905 S->AddDecl(Param); 4906 if (Param->getDeclName()) 4907 IdResolver.AddDecl(Param); 4908} 4909 4910/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4911/// processing the delayed method declaration for Method. The method 4912/// declaration is now considered finished. There may be a separate 4913/// ActOnStartOfFunctionDef action later (not necessarily 4914/// immediately!) for this method, if it was also defined inside the 4915/// class body. 4916void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4917 if (!MethodD) 4918 return; 4919 4920 AdjustDeclIfTemplate(MethodD); 4921 4922 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4923 4924 // Now that we have our default arguments, check the constructor 4925 // again. It could produce additional diagnostics or affect whether 4926 // the class has implicitly-declared destructors, among other 4927 // things. 4928 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4929 CheckConstructor(Constructor); 4930 4931 // Check the default arguments, which we may have added. 4932 if (!Method->isInvalidDecl()) 4933 CheckCXXDefaultArguments(Method); 4934} 4935 4936/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4937/// the well-formedness of the constructor declarator @p D with type @p 4938/// R. If there are any errors in the declarator, this routine will 4939/// emit diagnostics and set the invalid bit to true. In any case, the type 4940/// will be updated to reflect a well-formed type for the constructor and 4941/// returned. 4942QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4943 StorageClass &SC) { 4944 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4945 4946 // C++ [class.ctor]p3: 4947 // A constructor shall not be virtual (10.3) or static (9.4). A 4948 // constructor can be invoked for a const, volatile or const 4949 // volatile object. A constructor shall not be declared const, 4950 // volatile, or const volatile (9.3.2). 4951 if (isVirtual) { 4952 if (!D.isInvalidType()) 4953 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4954 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4955 << SourceRange(D.getIdentifierLoc()); 4956 D.setInvalidType(); 4957 } 4958 if (SC == SC_Static) { 4959 if (!D.isInvalidType()) 4960 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4961 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4962 << SourceRange(D.getIdentifierLoc()); 4963 D.setInvalidType(); 4964 SC = SC_None; 4965 } 4966 4967 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4968 if (FTI.TypeQuals != 0) { 4969 if (FTI.TypeQuals & Qualifiers::Const) 4970 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4971 << "const" << SourceRange(D.getIdentifierLoc()); 4972 if (FTI.TypeQuals & Qualifiers::Volatile) 4973 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4974 << "volatile" << SourceRange(D.getIdentifierLoc()); 4975 if (FTI.TypeQuals & Qualifiers::Restrict) 4976 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4977 << "restrict" << SourceRange(D.getIdentifierLoc()); 4978 D.setInvalidType(); 4979 } 4980 4981 // C++0x [class.ctor]p4: 4982 // A constructor shall not be declared with a ref-qualifier. 4983 if (FTI.hasRefQualifier()) { 4984 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4985 << FTI.RefQualifierIsLValueRef 4986 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4987 D.setInvalidType(); 4988 } 4989 4990 // Rebuild the function type "R" without any type qualifiers (in 4991 // case any of the errors above fired) and with "void" as the 4992 // return type, since constructors don't have return types. 4993 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4994 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4995 return R; 4996 4997 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4998 EPI.TypeQuals = 0; 4999 EPI.RefQualifier = RQ_None; 5000 5001 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5002 Proto->getNumArgs(), EPI); 5003} 5004 5005/// CheckConstructor - Checks a fully-formed constructor for 5006/// well-formedness, issuing any diagnostics required. Returns true if 5007/// the constructor declarator is invalid. 5008void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5009 CXXRecordDecl *ClassDecl 5010 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5011 if (!ClassDecl) 5012 return Constructor->setInvalidDecl(); 5013 5014 // C++ [class.copy]p3: 5015 // A declaration of a constructor for a class X is ill-formed if 5016 // its first parameter is of type (optionally cv-qualified) X and 5017 // either there are no other parameters or else all other 5018 // parameters have default arguments. 5019 if (!Constructor->isInvalidDecl() && 5020 ((Constructor->getNumParams() == 1) || 5021 (Constructor->getNumParams() > 1 && 5022 Constructor->getParamDecl(1)->hasDefaultArg())) && 5023 Constructor->getTemplateSpecializationKind() 5024 != TSK_ImplicitInstantiation) { 5025 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5026 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5027 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5028 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5029 const char *ConstRef 5030 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5031 : " const &"; 5032 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5033 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5034 5035 // FIXME: Rather that making the constructor invalid, we should endeavor 5036 // to fix the type. 5037 Constructor->setInvalidDecl(); 5038 } 5039 } 5040} 5041 5042/// CheckDestructor - Checks a fully-formed destructor definition for 5043/// well-formedness, issuing any diagnostics required. Returns true 5044/// on error. 5045bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5046 CXXRecordDecl *RD = Destructor->getParent(); 5047 5048 if (Destructor->isVirtual()) { 5049 SourceLocation Loc; 5050 5051 if (!Destructor->isImplicit()) 5052 Loc = Destructor->getLocation(); 5053 else 5054 Loc = RD->getLocation(); 5055 5056 // If we have a virtual destructor, look up the deallocation function 5057 FunctionDecl *OperatorDelete = 0; 5058 DeclarationName Name = 5059 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5060 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5061 return true; 5062 5063 MarkFunctionReferenced(Loc, OperatorDelete); 5064 5065 Destructor->setOperatorDelete(OperatorDelete); 5066 } 5067 5068 return false; 5069} 5070 5071static inline bool 5072FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5073 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5074 FTI.ArgInfo[0].Param && 5075 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5076} 5077 5078/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5079/// the well-formednes of the destructor declarator @p D with type @p 5080/// R. If there are any errors in the declarator, this routine will 5081/// emit diagnostics and set the declarator to invalid. Even if this happens, 5082/// will be updated to reflect a well-formed type for the destructor and 5083/// returned. 5084QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5085 StorageClass& SC) { 5086 // C++ [class.dtor]p1: 5087 // [...] A typedef-name that names a class is a class-name 5088 // (7.1.3); however, a typedef-name that names a class shall not 5089 // be used as the identifier in the declarator for a destructor 5090 // declaration. 5091 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5092 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5093 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5094 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5095 else if (const TemplateSpecializationType *TST = 5096 DeclaratorType->getAs<TemplateSpecializationType>()) 5097 if (TST->isTypeAlias()) 5098 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5099 << DeclaratorType << 1; 5100 5101 // C++ [class.dtor]p2: 5102 // A destructor is used to destroy objects of its class type. A 5103 // destructor takes no parameters, and no return type can be 5104 // specified for it (not even void). The address of a destructor 5105 // shall not be taken. A destructor shall not be static. A 5106 // destructor can be invoked for a const, volatile or const 5107 // volatile object. A destructor shall not be declared const, 5108 // volatile or const volatile (9.3.2). 5109 if (SC == SC_Static) { 5110 if (!D.isInvalidType()) 5111 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5112 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5113 << SourceRange(D.getIdentifierLoc()) 5114 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5115 5116 SC = SC_None; 5117 } 5118 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5119 // Destructors don't have return types, but the parser will 5120 // happily parse something like: 5121 // 5122 // class X { 5123 // float ~X(); 5124 // }; 5125 // 5126 // The return type will be eliminated later. 5127 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5128 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5129 << SourceRange(D.getIdentifierLoc()); 5130 } 5131 5132 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5133 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5134 if (FTI.TypeQuals & Qualifiers::Const) 5135 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5136 << "const" << SourceRange(D.getIdentifierLoc()); 5137 if (FTI.TypeQuals & Qualifiers::Volatile) 5138 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5139 << "volatile" << SourceRange(D.getIdentifierLoc()); 5140 if (FTI.TypeQuals & Qualifiers::Restrict) 5141 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5142 << "restrict" << SourceRange(D.getIdentifierLoc()); 5143 D.setInvalidType(); 5144 } 5145 5146 // C++0x [class.dtor]p2: 5147 // A destructor shall not be declared with a ref-qualifier. 5148 if (FTI.hasRefQualifier()) { 5149 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5150 << FTI.RefQualifierIsLValueRef 5151 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5152 D.setInvalidType(); 5153 } 5154 5155 // Make sure we don't have any parameters. 5156 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5157 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5158 5159 // Delete the parameters. 5160 FTI.freeArgs(); 5161 D.setInvalidType(); 5162 } 5163 5164 // Make sure the destructor isn't variadic. 5165 if (FTI.isVariadic) { 5166 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5167 D.setInvalidType(); 5168 } 5169 5170 // Rebuild the function type "R" without any type qualifiers or 5171 // parameters (in case any of the errors above fired) and with 5172 // "void" as the return type, since destructors don't have return 5173 // types. 5174 if (!D.isInvalidType()) 5175 return R; 5176 5177 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5178 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5179 EPI.Variadic = false; 5180 EPI.TypeQuals = 0; 5181 EPI.RefQualifier = RQ_None; 5182 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5183} 5184 5185/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5186/// well-formednes of the conversion function declarator @p D with 5187/// type @p R. If there are any errors in the declarator, this routine 5188/// will emit diagnostics and return true. Otherwise, it will return 5189/// false. Either way, the type @p R will be updated to reflect a 5190/// well-formed type for the conversion operator. 5191void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5192 StorageClass& SC) { 5193 // C++ [class.conv.fct]p1: 5194 // Neither parameter types nor return type can be specified. The 5195 // type of a conversion function (8.3.5) is "function taking no 5196 // parameter returning conversion-type-id." 5197 if (SC == SC_Static) { 5198 if (!D.isInvalidType()) 5199 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5200 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5201 << SourceRange(D.getIdentifierLoc()); 5202 D.setInvalidType(); 5203 SC = SC_None; 5204 } 5205 5206 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5207 5208 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5209 // Conversion functions don't have return types, but the parser will 5210 // happily parse something like: 5211 // 5212 // class X { 5213 // float operator bool(); 5214 // }; 5215 // 5216 // The return type will be changed later anyway. 5217 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5218 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5219 << SourceRange(D.getIdentifierLoc()); 5220 D.setInvalidType(); 5221 } 5222 5223 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5224 5225 // Make sure we don't have any parameters. 5226 if (Proto->getNumArgs() > 0) { 5227 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5228 5229 // Delete the parameters. 5230 D.getFunctionTypeInfo().freeArgs(); 5231 D.setInvalidType(); 5232 } else if (Proto->isVariadic()) { 5233 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5234 D.setInvalidType(); 5235 } 5236 5237 // Diagnose "&operator bool()" and other such nonsense. This 5238 // is actually a gcc extension which we don't support. 5239 if (Proto->getResultType() != ConvType) { 5240 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5241 << Proto->getResultType(); 5242 D.setInvalidType(); 5243 ConvType = Proto->getResultType(); 5244 } 5245 5246 // C++ [class.conv.fct]p4: 5247 // The conversion-type-id shall not represent a function type nor 5248 // an array type. 5249 if (ConvType->isArrayType()) { 5250 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5251 ConvType = Context.getPointerType(ConvType); 5252 D.setInvalidType(); 5253 } else if (ConvType->isFunctionType()) { 5254 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5255 ConvType = Context.getPointerType(ConvType); 5256 D.setInvalidType(); 5257 } 5258 5259 // Rebuild the function type "R" without any parameters (in case any 5260 // of the errors above fired) and with the conversion type as the 5261 // return type. 5262 if (D.isInvalidType()) 5263 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5264 5265 // C++0x explicit conversion operators. 5266 if (D.getDeclSpec().isExplicitSpecified()) 5267 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5268 getLangOptions().CPlusPlus0x ? 5269 diag::warn_cxx98_compat_explicit_conversion_functions : 5270 diag::ext_explicit_conversion_functions) 5271 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5272} 5273 5274/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5275/// the declaration of the given C++ conversion function. This routine 5276/// is responsible for recording the conversion function in the C++ 5277/// class, if possible. 5278Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5279 assert(Conversion && "Expected to receive a conversion function declaration"); 5280 5281 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5282 5283 // Make sure we aren't redeclaring the conversion function. 5284 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5285 5286 // C++ [class.conv.fct]p1: 5287 // [...] A conversion function is never used to convert a 5288 // (possibly cv-qualified) object to the (possibly cv-qualified) 5289 // same object type (or a reference to it), to a (possibly 5290 // cv-qualified) base class of that type (or a reference to it), 5291 // or to (possibly cv-qualified) void. 5292 // FIXME: Suppress this warning if the conversion function ends up being a 5293 // virtual function that overrides a virtual function in a base class. 5294 QualType ClassType 5295 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5296 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5297 ConvType = ConvTypeRef->getPointeeType(); 5298 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5299 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5300 /* Suppress diagnostics for instantiations. */; 5301 else if (ConvType->isRecordType()) { 5302 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5303 if (ConvType == ClassType) 5304 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5305 << ClassType; 5306 else if (IsDerivedFrom(ClassType, ConvType)) 5307 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5308 << ClassType << ConvType; 5309 } else if (ConvType->isVoidType()) { 5310 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5311 << ClassType << ConvType; 5312 } 5313 5314 if (FunctionTemplateDecl *ConversionTemplate 5315 = Conversion->getDescribedFunctionTemplate()) 5316 return ConversionTemplate; 5317 5318 return Conversion; 5319} 5320 5321//===----------------------------------------------------------------------===// 5322// Namespace Handling 5323//===----------------------------------------------------------------------===// 5324 5325 5326 5327/// ActOnStartNamespaceDef - This is called at the start of a namespace 5328/// definition. 5329Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5330 SourceLocation InlineLoc, 5331 SourceLocation NamespaceLoc, 5332 SourceLocation IdentLoc, 5333 IdentifierInfo *II, 5334 SourceLocation LBrace, 5335 AttributeList *AttrList) { 5336 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5337 // For anonymous namespace, take the location of the left brace. 5338 SourceLocation Loc = II ? IdentLoc : LBrace; 5339 bool IsInline = InlineLoc.isValid(); 5340 bool IsInvalid = false; 5341 bool IsStd = false; 5342 bool AddToKnown = false; 5343 Scope *DeclRegionScope = NamespcScope->getParent(); 5344 5345 NamespaceDecl *PrevNS = 0; 5346 if (II) { 5347 // C++ [namespace.def]p2: 5348 // The identifier in an original-namespace-definition shall not 5349 // have been previously defined in the declarative region in 5350 // which the original-namespace-definition appears. The 5351 // identifier in an original-namespace-definition is the name of 5352 // the namespace. Subsequently in that declarative region, it is 5353 // treated as an original-namespace-name. 5354 // 5355 // Since namespace names are unique in their scope, and we don't 5356 // look through using directives, just look for any ordinary names. 5357 5358 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5359 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5360 Decl::IDNS_Namespace; 5361 NamedDecl *PrevDecl = 0; 5362 for (DeclContext::lookup_result R 5363 = CurContext->getRedeclContext()->lookup(II); 5364 R.first != R.second; ++R.first) { 5365 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5366 PrevDecl = *R.first; 5367 break; 5368 } 5369 } 5370 5371 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5372 5373 if (PrevNS) { 5374 // This is an extended namespace definition. 5375 if (IsInline != PrevNS->isInline()) { 5376 // inline-ness must match 5377 if (PrevNS->isInline()) { 5378 // The user probably just forgot the 'inline', so suggest that it 5379 // be added back. 5380 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5381 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5382 } else { 5383 Diag(Loc, diag::err_inline_namespace_mismatch) 5384 << IsInline; 5385 } 5386 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5387 5388 IsInline = PrevNS->isInline(); 5389 } 5390 } else if (PrevDecl) { 5391 // This is an invalid name redefinition. 5392 Diag(Loc, diag::err_redefinition_different_kind) 5393 << II; 5394 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5395 IsInvalid = true; 5396 // Continue on to push Namespc as current DeclContext and return it. 5397 } else if (II->isStr("std") && 5398 CurContext->getRedeclContext()->isTranslationUnit()) { 5399 // This is the first "real" definition of the namespace "std", so update 5400 // our cache of the "std" namespace to point at this definition. 5401 PrevNS = getStdNamespace(); 5402 IsStd = true; 5403 AddToKnown = !IsInline; 5404 } else { 5405 // We've seen this namespace for the first time. 5406 AddToKnown = !IsInline; 5407 } 5408 } else { 5409 // Anonymous namespaces. 5410 5411 // Determine whether the parent already has an anonymous namespace. 5412 DeclContext *Parent = CurContext->getRedeclContext(); 5413 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5414 PrevNS = TU->getAnonymousNamespace(); 5415 } else { 5416 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5417 PrevNS = ND->getAnonymousNamespace(); 5418 } 5419 5420 if (PrevNS && IsInline != PrevNS->isInline()) { 5421 // inline-ness must match 5422 Diag(Loc, diag::err_inline_namespace_mismatch) 5423 << IsInline; 5424 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5425 5426 // Recover by ignoring the new namespace's inline status. 5427 IsInline = PrevNS->isInline(); 5428 } 5429 } 5430 5431 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5432 StartLoc, Loc, II, PrevNS); 5433 if (IsInvalid) 5434 Namespc->setInvalidDecl(); 5435 5436 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5437 5438 // FIXME: Should we be merging attributes? 5439 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5440 PushNamespaceVisibilityAttr(Attr, Loc); 5441 5442 if (IsStd) 5443 StdNamespace = Namespc; 5444 if (AddToKnown) 5445 KnownNamespaces[Namespc] = false; 5446 5447 if (II) { 5448 PushOnScopeChains(Namespc, DeclRegionScope); 5449 } else { 5450 // Link the anonymous namespace into its parent. 5451 DeclContext *Parent = CurContext->getRedeclContext(); 5452 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5453 TU->setAnonymousNamespace(Namespc); 5454 } else { 5455 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5456 } 5457 5458 CurContext->addDecl(Namespc); 5459 5460 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5461 // behaves as if it were replaced by 5462 // namespace unique { /* empty body */ } 5463 // using namespace unique; 5464 // namespace unique { namespace-body } 5465 // where all occurrences of 'unique' in a translation unit are 5466 // replaced by the same identifier and this identifier differs 5467 // from all other identifiers in the entire program. 5468 5469 // We just create the namespace with an empty name and then add an 5470 // implicit using declaration, just like the standard suggests. 5471 // 5472 // CodeGen enforces the "universally unique" aspect by giving all 5473 // declarations semantically contained within an anonymous 5474 // namespace internal linkage. 5475 5476 if (!PrevNS) { 5477 UsingDirectiveDecl* UD 5478 = UsingDirectiveDecl::Create(Context, CurContext, 5479 /* 'using' */ LBrace, 5480 /* 'namespace' */ SourceLocation(), 5481 /* qualifier */ NestedNameSpecifierLoc(), 5482 /* identifier */ SourceLocation(), 5483 Namespc, 5484 /* Ancestor */ CurContext); 5485 UD->setImplicit(); 5486 CurContext->addDecl(UD); 5487 } 5488 } 5489 5490 // Although we could have an invalid decl (i.e. the namespace name is a 5491 // redefinition), push it as current DeclContext and try to continue parsing. 5492 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5493 // for the namespace has the declarations that showed up in that particular 5494 // namespace definition. 5495 PushDeclContext(NamespcScope, Namespc); 5496 return Namespc; 5497} 5498 5499/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5500/// is a namespace alias, returns the namespace it points to. 5501static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5502 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5503 return AD->getNamespace(); 5504 return dyn_cast_or_null<NamespaceDecl>(D); 5505} 5506 5507/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5508/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5509void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5510 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5511 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5512 Namespc->setRBraceLoc(RBrace); 5513 PopDeclContext(); 5514 if (Namespc->hasAttr<VisibilityAttr>()) 5515 PopPragmaVisibility(true, RBrace); 5516} 5517 5518CXXRecordDecl *Sema::getStdBadAlloc() const { 5519 return cast_or_null<CXXRecordDecl>( 5520 StdBadAlloc.get(Context.getExternalSource())); 5521} 5522 5523NamespaceDecl *Sema::getStdNamespace() const { 5524 return cast_or_null<NamespaceDecl>( 5525 StdNamespace.get(Context.getExternalSource())); 5526} 5527 5528/// \brief Retrieve the special "std" namespace, which may require us to 5529/// implicitly define the namespace. 5530NamespaceDecl *Sema::getOrCreateStdNamespace() { 5531 if (!StdNamespace) { 5532 // The "std" namespace has not yet been defined, so build one implicitly. 5533 StdNamespace = NamespaceDecl::Create(Context, 5534 Context.getTranslationUnitDecl(), 5535 /*Inline=*/false, 5536 SourceLocation(), SourceLocation(), 5537 &PP.getIdentifierTable().get("std"), 5538 /*PrevDecl=*/0); 5539 getStdNamespace()->setImplicit(true); 5540 } 5541 5542 return getStdNamespace(); 5543} 5544 5545bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5546 assert(getLangOptions().CPlusPlus && 5547 "Looking for std::initializer_list outside of C++."); 5548 5549 // We're looking for implicit instantiations of 5550 // template <typename E> class std::initializer_list. 5551 5552 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5553 return false; 5554 5555 ClassTemplateDecl *Template = 0; 5556 const TemplateArgument *Arguments = 0; 5557 5558 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5559 5560 ClassTemplateSpecializationDecl *Specialization = 5561 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5562 if (!Specialization) 5563 return false; 5564 5565 Template = Specialization->getSpecializedTemplate(); 5566 Arguments = Specialization->getTemplateArgs().data(); 5567 } else if (const TemplateSpecializationType *TST = 5568 Ty->getAs<TemplateSpecializationType>()) { 5569 Template = dyn_cast_or_null<ClassTemplateDecl>( 5570 TST->getTemplateName().getAsTemplateDecl()); 5571 Arguments = TST->getArgs(); 5572 } 5573 if (!Template) 5574 return false; 5575 5576 if (!StdInitializerList) { 5577 // Haven't recognized std::initializer_list yet, maybe this is it. 5578 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5579 if (TemplateClass->getIdentifier() != 5580 &PP.getIdentifierTable().get("initializer_list") || 5581 !getStdNamespace()->InEnclosingNamespaceSetOf( 5582 TemplateClass->getDeclContext())) 5583 return false; 5584 // This is a template called std::initializer_list, but is it the right 5585 // template? 5586 TemplateParameterList *Params = Template->getTemplateParameters(); 5587 if (Params->getMinRequiredArguments() != 1) 5588 return false; 5589 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5590 return false; 5591 5592 // It's the right template. 5593 StdInitializerList = Template; 5594 } 5595 5596 if (Template != StdInitializerList) 5597 return false; 5598 5599 // This is an instance of std::initializer_list. Find the argument type. 5600 if (Element) 5601 *Element = Arguments[0].getAsType(); 5602 return true; 5603} 5604 5605static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5606 NamespaceDecl *Std = S.getStdNamespace(); 5607 if (!Std) { 5608 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5609 return 0; 5610 } 5611 5612 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5613 Loc, Sema::LookupOrdinaryName); 5614 if (!S.LookupQualifiedName(Result, Std)) { 5615 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5616 return 0; 5617 } 5618 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5619 if (!Template) { 5620 Result.suppressDiagnostics(); 5621 // We found something weird. Complain about the first thing we found. 5622 NamedDecl *Found = *Result.begin(); 5623 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5624 return 0; 5625 } 5626 5627 // We found some template called std::initializer_list. Now verify that it's 5628 // correct. 5629 TemplateParameterList *Params = Template->getTemplateParameters(); 5630 if (Params->getMinRequiredArguments() != 1 || 5631 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5632 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5633 return 0; 5634 } 5635 5636 return Template; 5637} 5638 5639QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5640 if (!StdInitializerList) { 5641 StdInitializerList = LookupStdInitializerList(*this, Loc); 5642 if (!StdInitializerList) 5643 return QualType(); 5644 } 5645 5646 TemplateArgumentListInfo Args(Loc, Loc); 5647 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5648 Context.getTrivialTypeSourceInfo(Element, 5649 Loc))); 5650 return Context.getCanonicalType( 5651 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5652} 5653 5654bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5655 // C++ [dcl.init.list]p2: 5656 // A constructor is an initializer-list constructor if its first parameter 5657 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5658 // std::initializer_list<E> for some type E, and either there are no other 5659 // parameters or else all other parameters have default arguments. 5660 if (Ctor->getNumParams() < 1 || 5661 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5662 return false; 5663 5664 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5665 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5666 ArgType = RT->getPointeeType().getUnqualifiedType(); 5667 5668 return isStdInitializerList(ArgType, 0); 5669} 5670 5671/// \brief Determine whether a using statement is in a context where it will be 5672/// apply in all contexts. 5673static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5674 switch (CurContext->getDeclKind()) { 5675 case Decl::TranslationUnit: 5676 return true; 5677 case Decl::LinkageSpec: 5678 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5679 default: 5680 return false; 5681 } 5682} 5683 5684namespace { 5685 5686// Callback to only accept typo corrections that are namespaces. 5687class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5688 public: 5689 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5690 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5691 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5692 } 5693 return false; 5694 } 5695}; 5696 5697} 5698 5699static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5700 CXXScopeSpec &SS, 5701 SourceLocation IdentLoc, 5702 IdentifierInfo *Ident) { 5703 NamespaceValidatorCCC Validator; 5704 R.clear(); 5705 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5706 R.getLookupKind(), Sc, &SS, 5707 Validator)) { 5708 std::string CorrectedStr(Corrected.getAsString(S.getLangOptions())); 5709 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOptions())); 5710 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5711 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5712 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5713 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5714 else 5715 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5716 << Ident << CorrectedQuotedStr 5717 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5718 5719 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5720 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5721 5722 Ident = Corrected.getCorrectionAsIdentifierInfo(); 5723 R.addDecl(Corrected.getCorrectionDecl()); 5724 return true; 5725 } 5726 return false; 5727} 5728 5729Decl *Sema::ActOnUsingDirective(Scope *S, 5730 SourceLocation UsingLoc, 5731 SourceLocation NamespcLoc, 5732 CXXScopeSpec &SS, 5733 SourceLocation IdentLoc, 5734 IdentifierInfo *NamespcName, 5735 AttributeList *AttrList) { 5736 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5737 assert(NamespcName && "Invalid NamespcName."); 5738 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5739 5740 // This can only happen along a recovery path. 5741 while (S->getFlags() & Scope::TemplateParamScope) 5742 S = S->getParent(); 5743 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5744 5745 UsingDirectiveDecl *UDir = 0; 5746 NestedNameSpecifier *Qualifier = 0; 5747 if (SS.isSet()) 5748 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5749 5750 // Lookup namespace name. 5751 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5752 LookupParsedName(R, S, &SS); 5753 if (R.isAmbiguous()) 5754 return 0; 5755 5756 if (R.empty()) { 5757 R.clear(); 5758 // Allow "using namespace std;" or "using namespace ::std;" even if 5759 // "std" hasn't been defined yet, for GCC compatibility. 5760 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5761 NamespcName->isStr("std")) { 5762 Diag(IdentLoc, diag::ext_using_undefined_std); 5763 R.addDecl(getOrCreateStdNamespace()); 5764 R.resolveKind(); 5765 } 5766 // Otherwise, attempt typo correction. 5767 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5768 } 5769 5770 if (!R.empty()) { 5771 NamedDecl *Named = R.getFoundDecl(); 5772 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5773 && "expected namespace decl"); 5774 // C++ [namespace.udir]p1: 5775 // A using-directive specifies that the names in the nominated 5776 // namespace can be used in the scope in which the 5777 // using-directive appears after the using-directive. During 5778 // unqualified name lookup (3.4.1), the names appear as if they 5779 // were declared in the nearest enclosing namespace which 5780 // contains both the using-directive and the nominated 5781 // namespace. [Note: in this context, "contains" means "contains 5782 // directly or indirectly". ] 5783 5784 // Find enclosing context containing both using-directive and 5785 // nominated namespace. 5786 NamespaceDecl *NS = getNamespaceDecl(Named); 5787 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5788 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5789 CommonAncestor = CommonAncestor->getParent(); 5790 5791 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5792 SS.getWithLocInContext(Context), 5793 IdentLoc, Named, CommonAncestor); 5794 5795 if (IsUsingDirectiveInToplevelContext(CurContext) && 5796 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5797 Diag(IdentLoc, diag::warn_using_directive_in_header); 5798 } 5799 5800 PushUsingDirective(S, UDir); 5801 } else { 5802 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5803 } 5804 5805 // FIXME: We ignore attributes for now. 5806 return UDir; 5807} 5808 5809void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5810 // If scope has associated entity, then using directive is at namespace 5811 // or translation unit scope. We add UsingDirectiveDecls, into 5812 // it's lookup structure. 5813 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 5814 Ctx->addDecl(UDir); 5815 else 5816 // Otherwise it is block-sope. using-directives will affect lookup 5817 // only to the end of scope. 5818 S->PushUsingDirective(UDir); 5819} 5820 5821 5822Decl *Sema::ActOnUsingDeclaration(Scope *S, 5823 AccessSpecifier AS, 5824 bool HasUsingKeyword, 5825 SourceLocation UsingLoc, 5826 CXXScopeSpec &SS, 5827 UnqualifiedId &Name, 5828 AttributeList *AttrList, 5829 bool IsTypeName, 5830 SourceLocation TypenameLoc) { 5831 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5832 5833 switch (Name.getKind()) { 5834 case UnqualifiedId::IK_ImplicitSelfParam: 5835 case UnqualifiedId::IK_Identifier: 5836 case UnqualifiedId::IK_OperatorFunctionId: 5837 case UnqualifiedId::IK_LiteralOperatorId: 5838 case UnqualifiedId::IK_ConversionFunctionId: 5839 break; 5840 5841 case UnqualifiedId::IK_ConstructorName: 5842 case UnqualifiedId::IK_ConstructorTemplateId: 5843 // C++0x inherited constructors. 5844 Diag(Name.getSourceRange().getBegin(), 5845 getLangOptions().CPlusPlus0x ? 5846 diag::warn_cxx98_compat_using_decl_constructor : 5847 diag::err_using_decl_constructor) 5848 << SS.getRange(); 5849 5850 if (getLangOptions().CPlusPlus0x) break; 5851 5852 return 0; 5853 5854 case UnqualifiedId::IK_DestructorName: 5855 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_destructor) 5856 << SS.getRange(); 5857 return 0; 5858 5859 case UnqualifiedId::IK_TemplateId: 5860 Diag(Name.getSourceRange().getBegin(), diag::err_using_decl_template_id) 5861 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5862 return 0; 5863 } 5864 5865 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5866 DeclarationName TargetName = TargetNameInfo.getName(); 5867 if (!TargetName) 5868 return 0; 5869 5870 // Warn about using declarations. 5871 // TODO: store that the declaration was written without 'using' and 5872 // talk about access decls instead of using decls in the 5873 // diagnostics. 5874 if (!HasUsingKeyword) { 5875 UsingLoc = Name.getSourceRange().getBegin(); 5876 5877 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5878 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5879 } 5880 5881 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5882 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5883 return 0; 5884 5885 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5886 TargetNameInfo, AttrList, 5887 /* IsInstantiation */ false, 5888 IsTypeName, TypenameLoc); 5889 if (UD) 5890 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5891 5892 return UD; 5893} 5894 5895/// \brief Determine whether a using declaration considers the given 5896/// declarations as "equivalent", e.g., if they are redeclarations of 5897/// the same entity or are both typedefs of the same type. 5898static bool 5899IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5900 bool &SuppressRedeclaration) { 5901 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5902 SuppressRedeclaration = false; 5903 return true; 5904 } 5905 5906 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5907 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5908 SuppressRedeclaration = true; 5909 return Context.hasSameType(TD1->getUnderlyingType(), 5910 TD2->getUnderlyingType()); 5911 } 5912 5913 return false; 5914} 5915 5916 5917/// Determines whether to create a using shadow decl for a particular 5918/// decl, given the set of decls existing prior to this using lookup. 5919bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5920 const LookupResult &Previous) { 5921 // Diagnose finding a decl which is not from a base class of the 5922 // current class. We do this now because there are cases where this 5923 // function will silently decide not to build a shadow decl, which 5924 // will pre-empt further diagnostics. 5925 // 5926 // We don't need to do this in C++0x because we do the check once on 5927 // the qualifier. 5928 // 5929 // FIXME: diagnose the following if we care enough: 5930 // struct A { int foo; }; 5931 // struct B : A { using A::foo; }; 5932 // template <class T> struct C : A {}; 5933 // template <class T> struct D : C<T> { using B::foo; } // <--- 5934 // This is invalid (during instantiation) in C++03 because B::foo 5935 // resolves to the using decl in B, which is not a base class of D<T>. 5936 // We can't diagnose it immediately because C<T> is an unknown 5937 // specialization. The UsingShadowDecl in D<T> then points directly 5938 // to A::foo, which will look well-formed when we instantiate. 5939 // The right solution is to not collapse the shadow-decl chain. 5940 if (!getLangOptions().CPlusPlus0x && CurContext->isRecord()) { 5941 DeclContext *OrigDC = Orig->getDeclContext(); 5942 5943 // Handle enums and anonymous structs. 5944 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5945 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5946 while (OrigRec->isAnonymousStructOrUnion()) 5947 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5948 5949 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5950 if (OrigDC == CurContext) { 5951 Diag(Using->getLocation(), 5952 diag::err_using_decl_nested_name_specifier_is_current_class) 5953 << Using->getQualifierLoc().getSourceRange(); 5954 Diag(Orig->getLocation(), diag::note_using_decl_target); 5955 return true; 5956 } 5957 5958 Diag(Using->getQualifierLoc().getBeginLoc(), 5959 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5960 << Using->getQualifier() 5961 << cast<CXXRecordDecl>(CurContext) 5962 << Using->getQualifierLoc().getSourceRange(); 5963 Diag(Orig->getLocation(), diag::note_using_decl_target); 5964 return true; 5965 } 5966 } 5967 5968 if (Previous.empty()) return false; 5969 5970 NamedDecl *Target = Orig; 5971 if (isa<UsingShadowDecl>(Target)) 5972 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5973 5974 // If the target happens to be one of the previous declarations, we 5975 // don't have a conflict. 5976 // 5977 // FIXME: but we might be increasing its access, in which case we 5978 // should redeclare it. 5979 NamedDecl *NonTag = 0, *Tag = 0; 5980 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5981 I != E; ++I) { 5982 NamedDecl *D = (*I)->getUnderlyingDecl(); 5983 bool Result; 5984 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5985 return Result; 5986 5987 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5988 } 5989 5990 if (Target->isFunctionOrFunctionTemplate()) { 5991 FunctionDecl *FD; 5992 if (isa<FunctionTemplateDecl>(Target)) 5993 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5994 else 5995 FD = cast<FunctionDecl>(Target); 5996 5997 NamedDecl *OldDecl = 0; 5998 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5999 case Ovl_Overload: 6000 return false; 6001 6002 case Ovl_NonFunction: 6003 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6004 break; 6005 6006 // We found a decl with the exact signature. 6007 case Ovl_Match: 6008 // If we're in a record, we want to hide the target, so we 6009 // return true (without a diagnostic) to tell the caller not to 6010 // build a shadow decl. 6011 if (CurContext->isRecord()) 6012 return true; 6013 6014 // If we're not in a record, this is an error. 6015 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6016 break; 6017 } 6018 6019 Diag(Target->getLocation(), diag::note_using_decl_target); 6020 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6021 return true; 6022 } 6023 6024 // Target is not a function. 6025 6026 if (isa<TagDecl>(Target)) { 6027 // No conflict between a tag and a non-tag. 6028 if (!Tag) return false; 6029 6030 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6031 Diag(Target->getLocation(), diag::note_using_decl_target); 6032 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6033 return true; 6034 } 6035 6036 // No conflict between a tag and a non-tag. 6037 if (!NonTag) return false; 6038 6039 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6040 Diag(Target->getLocation(), diag::note_using_decl_target); 6041 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6042 return true; 6043} 6044 6045/// Builds a shadow declaration corresponding to a 'using' declaration. 6046UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6047 UsingDecl *UD, 6048 NamedDecl *Orig) { 6049 6050 // If we resolved to another shadow declaration, just coalesce them. 6051 NamedDecl *Target = Orig; 6052 if (isa<UsingShadowDecl>(Target)) { 6053 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6054 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6055 } 6056 6057 UsingShadowDecl *Shadow 6058 = UsingShadowDecl::Create(Context, CurContext, 6059 UD->getLocation(), UD, Target); 6060 UD->addShadowDecl(Shadow); 6061 6062 Shadow->setAccess(UD->getAccess()); 6063 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6064 Shadow->setInvalidDecl(); 6065 6066 if (S) 6067 PushOnScopeChains(Shadow, S); 6068 else 6069 CurContext->addDecl(Shadow); 6070 6071 6072 return Shadow; 6073} 6074 6075/// Hides a using shadow declaration. This is required by the current 6076/// using-decl implementation when a resolvable using declaration in a 6077/// class is followed by a declaration which would hide or override 6078/// one or more of the using decl's targets; for example: 6079/// 6080/// struct Base { void foo(int); }; 6081/// struct Derived : Base { 6082/// using Base::foo; 6083/// void foo(int); 6084/// }; 6085/// 6086/// The governing language is C++03 [namespace.udecl]p12: 6087/// 6088/// When a using-declaration brings names from a base class into a 6089/// derived class scope, member functions in the derived class 6090/// override and/or hide member functions with the same name and 6091/// parameter types in a base class (rather than conflicting). 6092/// 6093/// There are two ways to implement this: 6094/// (1) optimistically create shadow decls when they're not hidden 6095/// by existing declarations, or 6096/// (2) don't create any shadow decls (or at least don't make them 6097/// visible) until we've fully parsed/instantiated the class. 6098/// The problem with (1) is that we might have to retroactively remove 6099/// a shadow decl, which requires several O(n) operations because the 6100/// decl structures are (very reasonably) not designed for removal. 6101/// (2) avoids this but is very fiddly and phase-dependent. 6102void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6103 if (Shadow->getDeclName().getNameKind() == 6104 DeclarationName::CXXConversionFunctionName) 6105 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6106 6107 // Remove it from the DeclContext... 6108 Shadow->getDeclContext()->removeDecl(Shadow); 6109 6110 // ...and the scope, if applicable... 6111 if (S) { 6112 S->RemoveDecl(Shadow); 6113 IdResolver.RemoveDecl(Shadow); 6114 } 6115 6116 // ...and the using decl. 6117 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6118 6119 // TODO: complain somehow if Shadow was used. It shouldn't 6120 // be possible for this to happen, because...? 6121} 6122 6123/// Builds a using declaration. 6124/// 6125/// \param IsInstantiation - Whether this call arises from an 6126/// instantiation of an unresolved using declaration. We treat 6127/// the lookup differently for these declarations. 6128NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6129 SourceLocation UsingLoc, 6130 CXXScopeSpec &SS, 6131 const DeclarationNameInfo &NameInfo, 6132 AttributeList *AttrList, 6133 bool IsInstantiation, 6134 bool IsTypeName, 6135 SourceLocation TypenameLoc) { 6136 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6137 SourceLocation IdentLoc = NameInfo.getLoc(); 6138 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6139 6140 // FIXME: We ignore attributes for now. 6141 6142 if (SS.isEmpty()) { 6143 Diag(IdentLoc, diag::err_using_requires_qualname); 6144 return 0; 6145 } 6146 6147 // Do the redeclaration lookup in the current scope. 6148 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6149 ForRedeclaration); 6150 Previous.setHideTags(false); 6151 if (S) { 6152 LookupName(Previous, S); 6153 6154 // It is really dumb that we have to do this. 6155 LookupResult::Filter F = Previous.makeFilter(); 6156 while (F.hasNext()) { 6157 NamedDecl *D = F.next(); 6158 if (!isDeclInScope(D, CurContext, S)) 6159 F.erase(); 6160 } 6161 F.done(); 6162 } else { 6163 assert(IsInstantiation && "no scope in non-instantiation"); 6164 assert(CurContext->isRecord() && "scope not record in instantiation"); 6165 LookupQualifiedName(Previous, CurContext); 6166 } 6167 6168 // Check for invalid redeclarations. 6169 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6170 return 0; 6171 6172 // Check for bad qualifiers. 6173 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6174 return 0; 6175 6176 DeclContext *LookupContext = computeDeclContext(SS); 6177 NamedDecl *D; 6178 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6179 if (!LookupContext) { 6180 if (IsTypeName) { 6181 // FIXME: not all declaration name kinds are legal here 6182 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6183 UsingLoc, TypenameLoc, 6184 QualifierLoc, 6185 IdentLoc, NameInfo.getName()); 6186 } else { 6187 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6188 QualifierLoc, NameInfo); 6189 } 6190 } else { 6191 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6192 NameInfo, IsTypeName); 6193 } 6194 D->setAccess(AS); 6195 CurContext->addDecl(D); 6196 6197 if (!LookupContext) return D; 6198 UsingDecl *UD = cast<UsingDecl>(D); 6199 6200 if (RequireCompleteDeclContext(SS, LookupContext)) { 6201 UD->setInvalidDecl(); 6202 return UD; 6203 } 6204 6205 // Constructor inheriting using decls get special treatment. 6206 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6207 if (CheckInheritedConstructorUsingDecl(UD)) 6208 UD->setInvalidDecl(); 6209 return UD; 6210 } 6211 6212 // Otherwise, look up the target name. 6213 6214 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6215 6216 // Unlike most lookups, we don't always want to hide tag 6217 // declarations: tag names are visible through the using declaration 6218 // even if hidden by ordinary names, *except* in a dependent context 6219 // where it's important for the sanity of two-phase lookup. 6220 if (!IsInstantiation) 6221 R.setHideTags(false); 6222 6223 LookupQualifiedName(R, LookupContext); 6224 6225 if (R.empty()) { 6226 Diag(IdentLoc, diag::err_no_member) 6227 << NameInfo.getName() << LookupContext << SS.getRange(); 6228 UD->setInvalidDecl(); 6229 return UD; 6230 } 6231 6232 if (R.isAmbiguous()) { 6233 UD->setInvalidDecl(); 6234 return UD; 6235 } 6236 6237 if (IsTypeName) { 6238 // If we asked for a typename and got a non-type decl, error out. 6239 if (!R.getAsSingle<TypeDecl>()) { 6240 Diag(IdentLoc, diag::err_using_typename_non_type); 6241 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6242 Diag((*I)->getUnderlyingDecl()->getLocation(), 6243 diag::note_using_decl_target); 6244 UD->setInvalidDecl(); 6245 return UD; 6246 } 6247 } else { 6248 // If we asked for a non-typename and we got a type, error out, 6249 // but only if this is an instantiation of an unresolved using 6250 // decl. Otherwise just silently find the type name. 6251 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6252 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6253 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6254 UD->setInvalidDecl(); 6255 return UD; 6256 } 6257 } 6258 6259 // C++0x N2914 [namespace.udecl]p6: 6260 // A using-declaration shall not name a namespace. 6261 if (R.getAsSingle<NamespaceDecl>()) { 6262 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6263 << SS.getRange(); 6264 UD->setInvalidDecl(); 6265 return UD; 6266 } 6267 6268 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6269 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6270 BuildUsingShadowDecl(S, UD, *I); 6271 } 6272 6273 return UD; 6274} 6275 6276/// Additional checks for a using declaration referring to a constructor name. 6277bool Sema::CheckInheritedConstructorUsingDecl(UsingDecl *UD) { 6278 if (UD->isTypeName()) { 6279 // FIXME: Cannot specify typename when specifying constructor 6280 return true; 6281 } 6282 6283 const Type *SourceType = UD->getQualifier()->getAsType(); 6284 assert(SourceType && 6285 "Using decl naming constructor doesn't have type in scope spec."); 6286 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6287 6288 // Check whether the named type is a direct base class. 6289 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6290 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6291 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6292 BaseIt != BaseE; ++BaseIt) { 6293 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6294 if (CanonicalSourceType == BaseType) 6295 break; 6296 } 6297 6298 if (BaseIt == BaseE) { 6299 // Did not find SourceType in the bases. 6300 Diag(UD->getUsingLocation(), 6301 diag::err_using_decl_constructor_not_in_direct_base) 6302 << UD->getNameInfo().getSourceRange() 6303 << QualType(SourceType, 0) << TargetClass; 6304 return true; 6305 } 6306 6307 BaseIt->setInheritConstructors(); 6308 6309 return false; 6310} 6311 6312/// Checks that the given using declaration is not an invalid 6313/// redeclaration. Note that this is checking only for the using decl 6314/// itself, not for any ill-formedness among the UsingShadowDecls. 6315bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6316 bool isTypeName, 6317 const CXXScopeSpec &SS, 6318 SourceLocation NameLoc, 6319 const LookupResult &Prev) { 6320 // C++03 [namespace.udecl]p8: 6321 // C++0x [namespace.udecl]p10: 6322 // A using-declaration is a declaration and can therefore be used 6323 // repeatedly where (and only where) multiple declarations are 6324 // allowed. 6325 // 6326 // That's in non-member contexts. 6327 if (!CurContext->getRedeclContext()->isRecord()) 6328 return false; 6329 6330 NestedNameSpecifier *Qual 6331 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6332 6333 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6334 NamedDecl *D = *I; 6335 6336 bool DTypename; 6337 NestedNameSpecifier *DQual; 6338 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6339 DTypename = UD->isTypeName(); 6340 DQual = UD->getQualifier(); 6341 } else if (UnresolvedUsingValueDecl *UD 6342 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6343 DTypename = false; 6344 DQual = UD->getQualifier(); 6345 } else if (UnresolvedUsingTypenameDecl *UD 6346 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6347 DTypename = true; 6348 DQual = UD->getQualifier(); 6349 } else continue; 6350 6351 // using decls differ if one says 'typename' and the other doesn't. 6352 // FIXME: non-dependent using decls? 6353 if (isTypeName != DTypename) continue; 6354 6355 // using decls differ if they name different scopes (but note that 6356 // template instantiation can cause this check to trigger when it 6357 // didn't before instantiation). 6358 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6359 Context.getCanonicalNestedNameSpecifier(DQual)) 6360 continue; 6361 6362 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6363 Diag(D->getLocation(), diag::note_using_decl) << 1; 6364 return true; 6365 } 6366 6367 return false; 6368} 6369 6370 6371/// Checks that the given nested-name qualifier used in a using decl 6372/// in the current context is appropriately related to the current 6373/// scope. If an error is found, diagnoses it and returns true. 6374bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6375 const CXXScopeSpec &SS, 6376 SourceLocation NameLoc) { 6377 DeclContext *NamedContext = computeDeclContext(SS); 6378 6379 if (!CurContext->isRecord()) { 6380 // C++03 [namespace.udecl]p3: 6381 // C++0x [namespace.udecl]p8: 6382 // A using-declaration for a class member shall be a member-declaration. 6383 6384 // If we weren't able to compute a valid scope, it must be a 6385 // dependent class scope. 6386 if (!NamedContext || NamedContext->isRecord()) { 6387 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6388 << SS.getRange(); 6389 return true; 6390 } 6391 6392 // Otherwise, everything is known to be fine. 6393 return false; 6394 } 6395 6396 // The current scope is a record. 6397 6398 // If the named context is dependent, we can't decide much. 6399 if (!NamedContext) { 6400 // FIXME: in C++0x, we can diagnose if we can prove that the 6401 // nested-name-specifier does not refer to a base class, which is 6402 // still possible in some cases. 6403 6404 // Otherwise we have to conservatively report that things might be 6405 // okay. 6406 return false; 6407 } 6408 6409 if (!NamedContext->isRecord()) { 6410 // Ideally this would point at the last name in the specifier, 6411 // but we don't have that level of source info. 6412 Diag(SS.getRange().getBegin(), 6413 diag::err_using_decl_nested_name_specifier_is_not_class) 6414 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6415 return true; 6416 } 6417 6418 if (!NamedContext->isDependentContext() && 6419 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6420 return true; 6421 6422 if (getLangOptions().CPlusPlus0x) { 6423 // C++0x [namespace.udecl]p3: 6424 // In a using-declaration used as a member-declaration, the 6425 // nested-name-specifier shall name a base class of the class 6426 // being defined. 6427 6428 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6429 cast<CXXRecordDecl>(NamedContext))) { 6430 if (CurContext == NamedContext) { 6431 Diag(NameLoc, 6432 diag::err_using_decl_nested_name_specifier_is_current_class) 6433 << SS.getRange(); 6434 return true; 6435 } 6436 6437 Diag(SS.getRange().getBegin(), 6438 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6439 << (NestedNameSpecifier*) SS.getScopeRep() 6440 << cast<CXXRecordDecl>(CurContext) 6441 << SS.getRange(); 6442 return true; 6443 } 6444 6445 return false; 6446 } 6447 6448 // C++03 [namespace.udecl]p4: 6449 // A using-declaration used as a member-declaration shall refer 6450 // to a member of a base class of the class being defined [etc.]. 6451 6452 // Salient point: SS doesn't have to name a base class as long as 6453 // lookup only finds members from base classes. Therefore we can 6454 // diagnose here only if we can prove that that can't happen, 6455 // i.e. if the class hierarchies provably don't intersect. 6456 6457 // TODO: it would be nice if "definitely valid" results were cached 6458 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6459 // need to be repeated. 6460 6461 struct UserData { 6462 llvm::DenseSet<const CXXRecordDecl*> Bases; 6463 6464 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6465 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6466 Data->Bases.insert(Base); 6467 return true; 6468 } 6469 6470 bool hasDependentBases(const CXXRecordDecl *Class) { 6471 return !Class->forallBases(collect, this); 6472 } 6473 6474 /// Returns true if the base is dependent or is one of the 6475 /// accumulated base classes. 6476 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6477 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6478 return !Data->Bases.count(Base); 6479 } 6480 6481 bool mightShareBases(const CXXRecordDecl *Class) { 6482 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6483 } 6484 }; 6485 6486 UserData Data; 6487 6488 // Returns false if we find a dependent base. 6489 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6490 return false; 6491 6492 // Returns false if the class has a dependent base or if it or one 6493 // of its bases is present in the base set of the current context. 6494 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6495 return false; 6496 6497 Diag(SS.getRange().getBegin(), 6498 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6499 << (NestedNameSpecifier*) SS.getScopeRep() 6500 << cast<CXXRecordDecl>(CurContext) 6501 << SS.getRange(); 6502 6503 return true; 6504} 6505 6506Decl *Sema::ActOnAliasDeclaration(Scope *S, 6507 AccessSpecifier AS, 6508 MultiTemplateParamsArg TemplateParamLists, 6509 SourceLocation UsingLoc, 6510 UnqualifiedId &Name, 6511 TypeResult Type) { 6512 // Skip up to the relevant declaration scope. 6513 while (S->getFlags() & Scope::TemplateParamScope) 6514 S = S->getParent(); 6515 assert((S->getFlags() & Scope::DeclScope) && 6516 "got alias-declaration outside of declaration scope"); 6517 6518 if (Type.isInvalid()) 6519 return 0; 6520 6521 bool Invalid = false; 6522 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6523 TypeSourceInfo *TInfo = 0; 6524 GetTypeFromParser(Type.get(), &TInfo); 6525 6526 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6527 return 0; 6528 6529 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6530 UPPC_DeclarationType)) { 6531 Invalid = true; 6532 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6533 TInfo->getTypeLoc().getBeginLoc()); 6534 } 6535 6536 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6537 LookupName(Previous, S); 6538 6539 // Warn about shadowing the name of a template parameter. 6540 if (Previous.isSingleResult() && 6541 Previous.getFoundDecl()->isTemplateParameter()) { 6542 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6543 Previous.clear(); 6544 } 6545 6546 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6547 "name in alias declaration must be an identifier"); 6548 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6549 Name.StartLocation, 6550 Name.Identifier, TInfo); 6551 6552 NewTD->setAccess(AS); 6553 6554 if (Invalid) 6555 NewTD->setInvalidDecl(); 6556 6557 CheckTypedefForVariablyModifiedType(S, NewTD); 6558 Invalid |= NewTD->isInvalidDecl(); 6559 6560 bool Redeclaration = false; 6561 6562 NamedDecl *NewND; 6563 if (TemplateParamLists.size()) { 6564 TypeAliasTemplateDecl *OldDecl = 0; 6565 TemplateParameterList *OldTemplateParams = 0; 6566 6567 if (TemplateParamLists.size() != 1) { 6568 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6569 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6570 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6571 } 6572 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6573 6574 // Only consider previous declarations in the same scope. 6575 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6576 /*ExplicitInstantiationOrSpecialization*/false); 6577 if (!Previous.empty()) { 6578 Redeclaration = true; 6579 6580 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6581 if (!OldDecl && !Invalid) { 6582 Diag(UsingLoc, diag::err_redefinition_different_kind) 6583 << Name.Identifier; 6584 6585 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6586 if (OldD->getLocation().isValid()) 6587 Diag(OldD->getLocation(), diag::note_previous_definition); 6588 6589 Invalid = true; 6590 } 6591 6592 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6593 if (TemplateParameterListsAreEqual(TemplateParams, 6594 OldDecl->getTemplateParameters(), 6595 /*Complain=*/true, 6596 TPL_TemplateMatch)) 6597 OldTemplateParams = OldDecl->getTemplateParameters(); 6598 else 6599 Invalid = true; 6600 6601 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6602 if (!Invalid && 6603 !Context.hasSameType(OldTD->getUnderlyingType(), 6604 NewTD->getUnderlyingType())) { 6605 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6606 // but we can't reasonably accept it. 6607 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6608 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6609 if (OldTD->getLocation().isValid()) 6610 Diag(OldTD->getLocation(), diag::note_previous_definition); 6611 Invalid = true; 6612 } 6613 } 6614 } 6615 6616 // Merge any previous default template arguments into our parameters, 6617 // and check the parameter list. 6618 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6619 TPC_TypeAliasTemplate)) 6620 return 0; 6621 6622 TypeAliasTemplateDecl *NewDecl = 6623 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6624 Name.Identifier, TemplateParams, 6625 NewTD); 6626 6627 NewDecl->setAccess(AS); 6628 6629 if (Invalid) 6630 NewDecl->setInvalidDecl(); 6631 else if (OldDecl) 6632 NewDecl->setPreviousDeclaration(OldDecl); 6633 6634 NewND = NewDecl; 6635 } else { 6636 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6637 NewND = NewTD; 6638 } 6639 6640 if (!Redeclaration) 6641 PushOnScopeChains(NewND, S); 6642 6643 return NewND; 6644} 6645 6646Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6647 SourceLocation NamespaceLoc, 6648 SourceLocation AliasLoc, 6649 IdentifierInfo *Alias, 6650 CXXScopeSpec &SS, 6651 SourceLocation IdentLoc, 6652 IdentifierInfo *Ident) { 6653 6654 // Lookup the namespace name. 6655 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6656 LookupParsedName(R, S, &SS); 6657 6658 // Check if we have a previous declaration with the same name. 6659 NamedDecl *PrevDecl 6660 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6661 ForRedeclaration); 6662 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6663 PrevDecl = 0; 6664 6665 if (PrevDecl) { 6666 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6667 // We already have an alias with the same name that points to the same 6668 // namespace, so don't create a new one. 6669 // FIXME: At some point, we'll want to create the (redundant) 6670 // declaration to maintain better source information. 6671 if (!R.isAmbiguous() && !R.empty() && 6672 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6673 return 0; 6674 } 6675 6676 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6677 diag::err_redefinition_different_kind; 6678 Diag(AliasLoc, DiagID) << Alias; 6679 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6680 return 0; 6681 } 6682 6683 if (R.isAmbiguous()) 6684 return 0; 6685 6686 if (R.empty()) { 6687 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6688 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 6689 return 0; 6690 } 6691 } 6692 6693 NamespaceAliasDecl *AliasDecl = 6694 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6695 Alias, SS.getWithLocInContext(Context), 6696 IdentLoc, R.getFoundDecl()); 6697 6698 PushOnScopeChains(AliasDecl, S); 6699 return AliasDecl; 6700} 6701 6702namespace { 6703 /// \brief Scoped object used to handle the state changes required in Sema 6704 /// to implicitly define the body of a C++ member function; 6705 class ImplicitlyDefinedFunctionScope { 6706 Sema &S; 6707 Sema::ContextRAII SavedContext; 6708 6709 public: 6710 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6711 : S(S), SavedContext(S, Method) 6712 { 6713 S.PushFunctionScope(); 6714 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6715 } 6716 6717 ~ImplicitlyDefinedFunctionScope() { 6718 S.PopExpressionEvaluationContext(); 6719 S.PopFunctionScopeInfo(); 6720 } 6721 }; 6722} 6723 6724Sema::ImplicitExceptionSpecification 6725Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6726 // C++ [except.spec]p14: 6727 // An implicitly declared special member function (Clause 12) shall have an 6728 // exception-specification. [...] 6729 ImplicitExceptionSpecification ExceptSpec(Context); 6730 if (ClassDecl->isInvalidDecl()) 6731 return ExceptSpec; 6732 6733 // Direct base-class constructors. 6734 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6735 BEnd = ClassDecl->bases_end(); 6736 B != BEnd; ++B) { 6737 if (B->isVirtual()) // Handled below. 6738 continue; 6739 6740 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6741 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6742 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6743 // If this is a deleted function, add it anyway. This might be conformant 6744 // with the standard. This might not. I'm not sure. It might not matter. 6745 if (Constructor) 6746 ExceptSpec.CalledDecl(Constructor); 6747 } 6748 } 6749 6750 // Virtual base-class constructors. 6751 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6752 BEnd = ClassDecl->vbases_end(); 6753 B != BEnd; ++B) { 6754 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6755 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6756 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6757 // If this is a deleted function, add it anyway. This might be conformant 6758 // with the standard. This might not. I'm not sure. It might not matter. 6759 if (Constructor) 6760 ExceptSpec.CalledDecl(Constructor); 6761 } 6762 } 6763 6764 // Field constructors. 6765 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6766 FEnd = ClassDecl->field_end(); 6767 F != FEnd; ++F) { 6768 if (F->hasInClassInitializer()) { 6769 if (Expr *E = F->getInClassInitializer()) 6770 ExceptSpec.CalledExpr(E); 6771 else if (!F->isInvalidDecl()) 6772 ExceptSpec.SetDelayed(); 6773 } else if (const RecordType *RecordTy 6774 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6775 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6776 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6777 // If this is a deleted function, add it anyway. This might be conformant 6778 // with the standard. This might not. I'm not sure. It might not matter. 6779 // In particular, the problem is that this function never gets called. It 6780 // might just be ill-formed because this function attempts to refer to 6781 // a deleted function here. 6782 if (Constructor) 6783 ExceptSpec.CalledDecl(Constructor); 6784 } 6785 } 6786 6787 return ExceptSpec; 6788} 6789 6790CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6791 CXXRecordDecl *ClassDecl) { 6792 // C++ [class.ctor]p5: 6793 // A default constructor for a class X is a constructor of class X 6794 // that can be called without an argument. If there is no 6795 // user-declared constructor for class X, a default constructor is 6796 // implicitly declared. An implicitly-declared default constructor 6797 // is an inline public member of its class. 6798 assert(!ClassDecl->hasUserDeclaredConstructor() && 6799 "Should not build implicit default constructor!"); 6800 6801 ImplicitExceptionSpecification Spec = 6802 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6803 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6804 6805 // Create the actual constructor declaration. 6806 CanQualType ClassType 6807 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6808 SourceLocation ClassLoc = ClassDecl->getLocation(); 6809 DeclarationName Name 6810 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6811 DeclarationNameInfo NameInfo(Name, ClassLoc); 6812 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6813 Context, ClassDecl, ClassLoc, NameInfo, 6814 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6815 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6816 /*isConstexpr=*/ClassDecl->defaultedDefaultConstructorIsConstexpr() && 6817 getLangOptions().CPlusPlus0x); 6818 DefaultCon->setAccess(AS_public); 6819 DefaultCon->setDefaulted(); 6820 DefaultCon->setImplicit(); 6821 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6822 6823 // Note that we have declared this constructor. 6824 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6825 6826 if (Scope *S = getScopeForContext(ClassDecl)) 6827 PushOnScopeChains(DefaultCon, S, false); 6828 ClassDecl->addDecl(DefaultCon); 6829 6830 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6831 DefaultCon->setDeletedAsWritten(); 6832 6833 return DefaultCon; 6834} 6835 6836void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6837 CXXConstructorDecl *Constructor) { 6838 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6839 !Constructor->doesThisDeclarationHaveABody() && 6840 !Constructor->isDeleted()) && 6841 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6842 6843 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6844 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6845 6846 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6847 DiagnosticErrorTrap Trap(Diags); 6848 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6849 Trap.hasErrorOccurred()) { 6850 Diag(CurrentLocation, diag::note_member_synthesized_at) 6851 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6852 Constructor->setInvalidDecl(); 6853 return; 6854 } 6855 6856 SourceLocation Loc = Constructor->getLocation(); 6857 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6858 6859 Constructor->setUsed(); 6860 MarkVTableUsed(CurrentLocation, ClassDecl); 6861 6862 if (ASTMutationListener *L = getASTMutationListener()) { 6863 L->CompletedImplicitDefinition(Constructor); 6864 } 6865} 6866 6867/// Get any existing defaulted default constructor for the given class. Do not 6868/// implicitly define one if it does not exist. 6869static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6870 CXXRecordDecl *D) { 6871 ASTContext &Context = Self.Context; 6872 QualType ClassType = Context.getTypeDeclType(D); 6873 DeclarationName ConstructorName 6874 = Context.DeclarationNames.getCXXConstructorName( 6875 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6876 6877 DeclContext::lookup_const_iterator Con, ConEnd; 6878 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6879 Con != ConEnd; ++Con) { 6880 // A function template cannot be defaulted. 6881 if (isa<FunctionTemplateDecl>(*Con)) 6882 continue; 6883 6884 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6885 if (Constructor->isDefaultConstructor()) 6886 return Constructor->isDefaulted() ? Constructor : 0; 6887 } 6888 return 0; 6889} 6890 6891void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6892 if (!D) return; 6893 AdjustDeclIfTemplate(D); 6894 6895 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6896 CXXConstructorDecl *CtorDecl 6897 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6898 6899 if (!CtorDecl) return; 6900 6901 // Compute the exception specification for the default constructor. 6902 const FunctionProtoType *CtorTy = 6903 CtorDecl->getType()->castAs<FunctionProtoType>(); 6904 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6905 ImplicitExceptionSpecification Spec = 6906 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6907 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6908 assert(EPI.ExceptionSpecType != EST_Delayed); 6909 6910 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6911 } 6912 6913 // If the default constructor is explicitly defaulted, checking the exception 6914 // specification is deferred until now. 6915 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6916 !ClassDecl->isDependentType()) 6917 CheckExplicitlyDefaultedDefaultConstructor(CtorDecl); 6918} 6919 6920void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6921 // We start with an initial pass over the base classes to collect those that 6922 // inherit constructors from. If there are none, we can forgo all further 6923 // processing. 6924 typedef SmallVector<const RecordType *, 4> BasesVector; 6925 BasesVector BasesToInheritFrom; 6926 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6927 BaseE = ClassDecl->bases_end(); 6928 BaseIt != BaseE; ++BaseIt) { 6929 if (BaseIt->getInheritConstructors()) { 6930 QualType Base = BaseIt->getType(); 6931 if (Base->isDependentType()) { 6932 // If we inherit constructors from anything that is dependent, just 6933 // abort processing altogether. We'll get another chance for the 6934 // instantiations. 6935 return; 6936 } 6937 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6938 } 6939 } 6940 if (BasesToInheritFrom.empty()) 6941 return; 6942 6943 // Now collect the constructors that we already have in the current class. 6944 // Those take precedence over inherited constructors. 6945 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6946 // unless there is a user-declared constructor with the same signature in 6947 // the class where the using-declaration appears. 6948 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6949 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6950 CtorE = ClassDecl->ctor_end(); 6951 CtorIt != CtorE; ++CtorIt) { 6952 ExistingConstructors.insert( 6953 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6954 } 6955 6956 Scope *S = getScopeForContext(ClassDecl); 6957 DeclarationName CreatedCtorName = 6958 Context.DeclarationNames.getCXXConstructorName( 6959 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6960 6961 // Now comes the true work. 6962 // First, we keep a map from constructor types to the base that introduced 6963 // them. Needed for finding conflicting constructors. We also keep the 6964 // actually inserted declarations in there, for pretty diagnostics. 6965 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6966 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6967 ConstructorToSourceMap InheritedConstructors; 6968 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6969 BaseE = BasesToInheritFrom.end(); 6970 BaseIt != BaseE; ++BaseIt) { 6971 const RecordType *Base = *BaseIt; 6972 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6973 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6974 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6975 CtorE = BaseDecl->ctor_end(); 6976 CtorIt != CtorE; ++CtorIt) { 6977 // Find the using declaration for inheriting this base's constructors. 6978 DeclarationName Name = 6979 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6980 UsingDecl *UD = dyn_cast_or_null<UsingDecl>( 6981 LookupSingleName(S, Name,SourceLocation(), LookupUsingDeclName)); 6982 SourceLocation UsingLoc = UD ? UD->getLocation() : 6983 ClassDecl->getLocation(); 6984 6985 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6986 // from the class X named in the using-declaration consists of actual 6987 // constructors and notional constructors that result from the 6988 // transformation of defaulted parameters as follows: 6989 // - all non-template default constructors of X, and 6990 // - for each non-template constructor of X that has at least one 6991 // parameter with a default argument, the set of constructors that 6992 // results from omitting any ellipsis parameter specification and 6993 // successively omitting parameters with a default argument from the 6994 // end of the parameter-type-list. 6995 CXXConstructorDecl *BaseCtor = *CtorIt; 6996 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6997 const FunctionProtoType *BaseCtorType = 6998 BaseCtor->getType()->getAs<FunctionProtoType>(); 6999 7000 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7001 maxParams = BaseCtor->getNumParams(); 7002 params <= maxParams; ++params) { 7003 // Skip default constructors. They're never inherited. 7004 if (params == 0) 7005 continue; 7006 // Skip copy and move constructors for the same reason. 7007 if (CanBeCopyOrMove && params == 1) 7008 continue; 7009 7010 // Build up a function type for this particular constructor. 7011 // FIXME: The working paper does not consider that the exception spec 7012 // for the inheriting constructor might be larger than that of the 7013 // source. This code doesn't yet, either. When it does, this code will 7014 // need to be delayed until after exception specifications and in-class 7015 // member initializers are attached. 7016 const Type *NewCtorType; 7017 if (params == maxParams) 7018 NewCtorType = BaseCtorType; 7019 else { 7020 SmallVector<QualType, 16> Args; 7021 for (unsigned i = 0; i < params; ++i) { 7022 Args.push_back(BaseCtorType->getArgType(i)); 7023 } 7024 FunctionProtoType::ExtProtoInfo ExtInfo = 7025 BaseCtorType->getExtProtoInfo(); 7026 ExtInfo.Variadic = false; 7027 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7028 Args.data(), params, ExtInfo) 7029 .getTypePtr(); 7030 } 7031 const Type *CanonicalNewCtorType = 7032 Context.getCanonicalType(NewCtorType); 7033 7034 // Now that we have the type, first check if the class already has a 7035 // constructor with this signature. 7036 if (ExistingConstructors.count(CanonicalNewCtorType)) 7037 continue; 7038 7039 // Then we check if we have already declared an inherited constructor 7040 // with this signature. 7041 std::pair<ConstructorToSourceMap::iterator, bool> result = 7042 InheritedConstructors.insert(std::make_pair( 7043 CanonicalNewCtorType, 7044 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7045 if (!result.second) { 7046 // Already in the map. If it came from a different class, that's an 7047 // error. Not if it's from the same. 7048 CanQualType PreviousBase = result.first->second.first; 7049 if (CanonicalBase != PreviousBase) { 7050 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7051 const CXXConstructorDecl *PrevBaseCtor = 7052 PrevCtor->getInheritedConstructor(); 7053 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7054 7055 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7056 Diag(BaseCtor->getLocation(), 7057 diag::note_using_decl_constructor_conflict_current_ctor); 7058 Diag(PrevBaseCtor->getLocation(), 7059 diag::note_using_decl_constructor_conflict_previous_ctor); 7060 Diag(PrevCtor->getLocation(), 7061 diag::note_using_decl_constructor_conflict_previous_using); 7062 } 7063 continue; 7064 } 7065 7066 // OK, we're there, now add the constructor. 7067 // C++0x [class.inhctor]p8: [...] that would be performed by a 7068 // user-written inline constructor [...] 7069 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7070 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7071 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7072 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7073 /*ImplicitlyDeclared=*/true, 7074 // FIXME: Due to a defect in the standard, we treat inherited 7075 // constructors as constexpr even if that makes them ill-formed. 7076 /*Constexpr=*/BaseCtor->isConstexpr()); 7077 NewCtor->setAccess(BaseCtor->getAccess()); 7078 7079 // Build up the parameter decls and add them. 7080 SmallVector<ParmVarDecl *, 16> ParamDecls; 7081 for (unsigned i = 0; i < params; ++i) { 7082 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7083 UsingLoc, UsingLoc, 7084 /*IdentifierInfo=*/0, 7085 BaseCtorType->getArgType(i), 7086 /*TInfo=*/0, SC_None, 7087 SC_None, /*DefaultArg=*/0)); 7088 } 7089 NewCtor->setParams(ParamDecls); 7090 NewCtor->setInheritedConstructor(BaseCtor); 7091 7092 PushOnScopeChains(NewCtor, S, false); 7093 ClassDecl->addDecl(NewCtor); 7094 result.first->second.second = NewCtor; 7095 } 7096 } 7097 } 7098} 7099 7100Sema::ImplicitExceptionSpecification 7101Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7102 // C++ [except.spec]p14: 7103 // An implicitly declared special member function (Clause 12) shall have 7104 // an exception-specification. 7105 ImplicitExceptionSpecification ExceptSpec(Context); 7106 if (ClassDecl->isInvalidDecl()) 7107 return ExceptSpec; 7108 7109 // Direct base-class destructors. 7110 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7111 BEnd = ClassDecl->bases_end(); 7112 B != BEnd; ++B) { 7113 if (B->isVirtual()) // Handled below. 7114 continue; 7115 7116 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7117 ExceptSpec.CalledDecl( 7118 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7119 } 7120 7121 // Virtual base-class destructors. 7122 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7123 BEnd = ClassDecl->vbases_end(); 7124 B != BEnd; ++B) { 7125 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7126 ExceptSpec.CalledDecl( 7127 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7128 } 7129 7130 // Field destructors. 7131 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7132 FEnd = ClassDecl->field_end(); 7133 F != FEnd; ++F) { 7134 if (const RecordType *RecordTy 7135 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7136 ExceptSpec.CalledDecl( 7137 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7138 } 7139 7140 return ExceptSpec; 7141} 7142 7143CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7144 // C++ [class.dtor]p2: 7145 // If a class has no user-declared destructor, a destructor is 7146 // declared implicitly. An implicitly-declared destructor is an 7147 // inline public member of its class. 7148 7149 ImplicitExceptionSpecification Spec = 7150 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7151 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7152 7153 // Create the actual destructor declaration. 7154 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7155 7156 CanQualType ClassType 7157 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7158 SourceLocation ClassLoc = ClassDecl->getLocation(); 7159 DeclarationName Name 7160 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7161 DeclarationNameInfo NameInfo(Name, ClassLoc); 7162 CXXDestructorDecl *Destructor 7163 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7164 /*isInline=*/true, 7165 /*isImplicitlyDeclared=*/true); 7166 Destructor->setAccess(AS_public); 7167 Destructor->setDefaulted(); 7168 Destructor->setImplicit(); 7169 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7170 7171 // Note that we have declared this destructor. 7172 ++ASTContext::NumImplicitDestructorsDeclared; 7173 7174 // Introduce this destructor into its scope. 7175 if (Scope *S = getScopeForContext(ClassDecl)) 7176 PushOnScopeChains(Destructor, S, false); 7177 ClassDecl->addDecl(Destructor); 7178 7179 // This could be uniqued if it ever proves significant. 7180 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7181 7182 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7183 Destructor->setDeletedAsWritten(); 7184 7185 AddOverriddenMethods(ClassDecl, Destructor); 7186 7187 return Destructor; 7188} 7189 7190void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7191 CXXDestructorDecl *Destructor) { 7192 assert((Destructor->isDefaulted() && 7193 !Destructor->doesThisDeclarationHaveABody()) && 7194 "DefineImplicitDestructor - call it for implicit default dtor"); 7195 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7196 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7197 7198 if (Destructor->isInvalidDecl()) 7199 return; 7200 7201 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7202 7203 DiagnosticErrorTrap Trap(Diags); 7204 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7205 Destructor->getParent()); 7206 7207 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7208 Diag(CurrentLocation, diag::note_member_synthesized_at) 7209 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7210 7211 Destructor->setInvalidDecl(); 7212 return; 7213 } 7214 7215 SourceLocation Loc = Destructor->getLocation(); 7216 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7217 Destructor->setImplicitlyDefined(true); 7218 Destructor->setUsed(); 7219 MarkVTableUsed(CurrentLocation, ClassDecl); 7220 7221 if (ASTMutationListener *L = getASTMutationListener()) { 7222 L->CompletedImplicitDefinition(Destructor); 7223 } 7224} 7225 7226void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7227 CXXDestructorDecl *destructor) { 7228 // C++11 [class.dtor]p3: 7229 // A declaration of a destructor that does not have an exception- 7230 // specification is implicitly considered to have the same exception- 7231 // specification as an implicit declaration. 7232 const FunctionProtoType *dtorType = destructor->getType()-> 7233 getAs<FunctionProtoType>(); 7234 if (dtorType->hasExceptionSpec()) 7235 return; 7236 7237 ImplicitExceptionSpecification exceptSpec = 7238 ComputeDefaultedDtorExceptionSpec(classDecl); 7239 7240 // Replace the destructor's type, building off the existing one. Fortunately, 7241 // the only thing of interest in the destructor type is its extended info. 7242 // The return and arguments are fixed. 7243 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7244 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7245 epi.NumExceptions = exceptSpec.size(); 7246 epi.Exceptions = exceptSpec.data(); 7247 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7248 7249 destructor->setType(ty); 7250 7251 // FIXME: If the destructor has a body that could throw, and the newly created 7252 // spec doesn't allow exceptions, we should emit a warning, because this 7253 // change in behavior can break conforming C++03 programs at runtime. 7254 // However, we don't have a body yet, so it needs to be done somewhere else. 7255} 7256 7257/// \brief Builds a statement that copies/moves the given entity from \p From to 7258/// \c To. 7259/// 7260/// This routine is used to copy/move the members of a class with an 7261/// implicitly-declared copy/move assignment operator. When the entities being 7262/// copied are arrays, this routine builds for loops to copy them. 7263/// 7264/// \param S The Sema object used for type-checking. 7265/// 7266/// \param Loc The location where the implicit copy/move is being generated. 7267/// 7268/// \param T The type of the expressions being copied/moved. Both expressions 7269/// must have this type. 7270/// 7271/// \param To The expression we are copying/moving to. 7272/// 7273/// \param From The expression we are copying/moving from. 7274/// 7275/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7276/// Otherwise, it's a non-static member subobject. 7277/// 7278/// \param Copying Whether we're copying or moving. 7279/// 7280/// \param Depth Internal parameter recording the depth of the recursion. 7281/// 7282/// \returns A statement or a loop that copies the expressions. 7283static StmtResult 7284BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7285 Expr *To, Expr *From, 7286 bool CopyingBaseSubobject, bool Copying, 7287 unsigned Depth = 0) { 7288 // C++0x [class.copy]p28: 7289 // Each subobject is assigned in the manner appropriate to its type: 7290 // 7291 // - if the subobject is of class type, as if by a call to operator= with 7292 // the subobject as the object expression and the corresponding 7293 // subobject of x as a single function argument (as if by explicit 7294 // qualification; that is, ignoring any possible virtual overriding 7295 // functions in more derived classes); 7296 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7297 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7298 7299 // Look for operator=. 7300 DeclarationName Name 7301 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7302 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7303 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7304 7305 // Filter out any result that isn't a copy/move-assignment operator. 7306 LookupResult::Filter F = OpLookup.makeFilter(); 7307 while (F.hasNext()) { 7308 NamedDecl *D = F.next(); 7309 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7310 if (Copying ? Method->isCopyAssignmentOperator() : 7311 Method->isMoveAssignmentOperator()) 7312 continue; 7313 7314 F.erase(); 7315 } 7316 F.done(); 7317 7318 // Suppress the protected check (C++ [class.protected]) for each of the 7319 // assignment operators we found. This strange dance is required when 7320 // we're assigning via a base classes's copy-assignment operator. To 7321 // ensure that we're getting the right base class subobject (without 7322 // ambiguities), we need to cast "this" to that subobject type; to 7323 // ensure that we don't go through the virtual call mechanism, we need 7324 // to qualify the operator= name with the base class (see below). However, 7325 // this means that if the base class has a protected copy assignment 7326 // operator, the protected member access check will fail. So, we 7327 // rewrite "protected" access to "public" access in this case, since we 7328 // know by construction that we're calling from a derived class. 7329 if (CopyingBaseSubobject) { 7330 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7331 L != LEnd; ++L) { 7332 if (L.getAccess() == AS_protected) 7333 L.setAccess(AS_public); 7334 } 7335 } 7336 7337 // Create the nested-name-specifier that will be used to qualify the 7338 // reference to operator=; this is required to suppress the virtual 7339 // call mechanism. 7340 CXXScopeSpec SS; 7341 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7342 SS.MakeTrivial(S.Context, 7343 NestedNameSpecifier::Create(S.Context, 0, false, 7344 CanonicalT), 7345 Loc); 7346 7347 // Create the reference to operator=. 7348 ExprResult OpEqualRef 7349 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7350 /*TemplateKWLoc=*/SourceLocation(), 7351 /*FirstQualifierInScope=*/0, 7352 OpLookup, 7353 /*TemplateArgs=*/0, 7354 /*SuppressQualifierCheck=*/true); 7355 if (OpEqualRef.isInvalid()) 7356 return StmtError(); 7357 7358 // Build the call to the assignment operator. 7359 7360 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7361 OpEqualRef.takeAs<Expr>(), 7362 Loc, &From, 1, Loc); 7363 if (Call.isInvalid()) 7364 return StmtError(); 7365 7366 return S.Owned(Call.takeAs<Stmt>()); 7367 } 7368 7369 // - if the subobject is of scalar type, the built-in assignment 7370 // operator is used. 7371 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7372 if (!ArrayTy) { 7373 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7374 if (Assignment.isInvalid()) 7375 return StmtError(); 7376 7377 return S.Owned(Assignment.takeAs<Stmt>()); 7378 } 7379 7380 // - if the subobject is an array, each element is assigned, in the 7381 // manner appropriate to the element type; 7382 7383 // Construct a loop over the array bounds, e.g., 7384 // 7385 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7386 // 7387 // that will copy each of the array elements. 7388 QualType SizeType = S.Context.getSizeType(); 7389 7390 // Create the iteration variable. 7391 IdentifierInfo *IterationVarName = 0; 7392 { 7393 SmallString<8> Str; 7394 llvm::raw_svector_ostream OS(Str); 7395 OS << "__i" << Depth; 7396 IterationVarName = &S.Context.Idents.get(OS.str()); 7397 } 7398 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7399 IterationVarName, SizeType, 7400 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7401 SC_None, SC_None); 7402 7403 // Initialize the iteration variable to zero. 7404 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7405 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7406 7407 // Create a reference to the iteration variable; we'll use this several 7408 // times throughout. 7409 Expr *IterationVarRef 7410 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7411 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7412 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7413 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7414 7415 // Create the DeclStmt that holds the iteration variable. 7416 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7417 7418 // Create the comparison against the array bound. 7419 llvm::APInt Upper 7420 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7421 Expr *Comparison 7422 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7423 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7424 BO_NE, S.Context.BoolTy, 7425 VK_RValue, OK_Ordinary, Loc); 7426 7427 // Create the pre-increment of the iteration variable. 7428 Expr *Increment 7429 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7430 VK_LValue, OK_Ordinary, Loc); 7431 7432 // Subscript the "from" and "to" expressions with the iteration variable. 7433 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7434 IterationVarRefRVal, 7435 Loc)); 7436 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7437 IterationVarRefRVal, 7438 Loc)); 7439 if (!Copying) // Cast to rvalue 7440 From = CastForMoving(S, From); 7441 7442 // Build the copy/move for an individual element of the array. 7443 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7444 To, From, CopyingBaseSubobject, 7445 Copying, Depth + 1); 7446 if (Copy.isInvalid()) 7447 return StmtError(); 7448 7449 // Construct the loop that copies all elements of this array. 7450 return S.ActOnForStmt(Loc, Loc, InitStmt, 7451 S.MakeFullExpr(Comparison), 7452 0, S.MakeFullExpr(Increment), 7453 Loc, Copy.take()); 7454} 7455 7456std::pair<Sema::ImplicitExceptionSpecification, bool> 7457Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7458 CXXRecordDecl *ClassDecl) { 7459 if (ClassDecl->isInvalidDecl()) 7460 return std::make_pair(ImplicitExceptionSpecification(Context), false); 7461 7462 // C++ [class.copy]p10: 7463 // If the class definition does not explicitly declare a copy 7464 // assignment operator, one is declared implicitly. 7465 // The implicitly-defined copy assignment operator for a class X 7466 // will have the form 7467 // 7468 // X& X::operator=(const X&) 7469 // 7470 // if 7471 bool HasConstCopyAssignment = true; 7472 7473 // -- each direct base class B of X has a copy assignment operator 7474 // whose parameter is of type const B&, const volatile B& or B, 7475 // and 7476 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7477 BaseEnd = ClassDecl->bases_end(); 7478 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7479 // We'll handle this below 7480 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7481 continue; 7482 7483 assert(!Base->getType()->isDependentType() && 7484 "Cannot generate implicit members for class with dependent bases."); 7485 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7486 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7487 &HasConstCopyAssignment); 7488 } 7489 7490 // In C++11, the above citation has "or virtual" added 7491 if (LangOpts.CPlusPlus0x) { 7492 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7493 BaseEnd = ClassDecl->vbases_end(); 7494 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7495 assert(!Base->getType()->isDependentType() && 7496 "Cannot generate implicit members for class with dependent bases."); 7497 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7498 LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0, 7499 &HasConstCopyAssignment); 7500 } 7501 } 7502 7503 // -- for all the nonstatic data members of X that are of a class 7504 // type M (or array thereof), each such class type has a copy 7505 // assignment operator whose parameter is of type const M&, 7506 // const volatile M& or M. 7507 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7508 FieldEnd = ClassDecl->field_end(); 7509 HasConstCopyAssignment && Field != FieldEnd; 7510 ++Field) { 7511 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7512 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7513 LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, false, 0, 7514 &HasConstCopyAssignment); 7515 } 7516 } 7517 7518 // Otherwise, the implicitly declared copy assignment operator will 7519 // have the form 7520 // 7521 // X& X::operator=(X&) 7522 7523 // C++ [except.spec]p14: 7524 // An implicitly declared special member function (Clause 12) shall have an 7525 // exception-specification. [...] 7526 7527 // It is unspecified whether or not an implicit copy assignment operator 7528 // attempts to deduplicate calls to assignment operators of virtual bases are 7529 // made. As such, this exception specification is effectively unspecified. 7530 // Based on a similar decision made for constness in C++0x, we're erring on 7531 // the side of assuming such calls to be made regardless of whether they 7532 // actually happen. 7533 ImplicitExceptionSpecification ExceptSpec(Context); 7534 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7535 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7536 BaseEnd = ClassDecl->bases_end(); 7537 Base != BaseEnd; ++Base) { 7538 if (Base->isVirtual()) 7539 continue; 7540 7541 CXXRecordDecl *BaseClassDecl 7542 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7543 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7544 ArgQuals, false, 0)) 7545 ExceptSpec.CalledDecl(CopyAssign); 7546 } 7547 7548 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7549 BaseEnd = ClassDecl->vbases_end(); 7550 Base != BaseEnd; ++Base) { 7551 CXXRecordDecl *BaseClassDecl 7552 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7553 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7554 ArgQuals, false, 0)) 7555 ExceptSpec.CalledDecl(CopyAssign); 7556 } 7557 7558 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7559 FieldEnd = ClassDecl->field_end(); 7560 Field != FieldEnd; 7561 ++Field) { 7562 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7563 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7564 if (CXXMethodDecl *CopyAssign = 7565 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7566 ExceptSpec.CalledDecl(CopyAssign); 7567 } 7568 } 7569 7570 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7571} 7572 7573CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7574 // Note: The following rules are largely analoguous to the copy 7575 // constructor rules. Note that virtual bases are not taken into account 7576 // for determining the argument type of the operator. Note also that 7577 // operators taking an object instead of a reference are allowed. 7578 7579 ImplicitExceptionSpecification Spec(Context); 7580 bool Const; 7581 llvm::tie(Spec, Const) = 7582 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7583 7584 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7585 QualType RetType = Context.getLValueReferenceType(ArgType); 7586 if (Const) 7587 ArgType = ArgType.withConst(); 7588 ArgType = Context.getLValueReferenceType(ArgType); 7589 7590 // An implicitly-declared copy assignment operator is an inline public 7591 // member of its class. 7592 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7593 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7594 SourceLocation ClassLoc = ClassDecl->getLocation(); 7595 DeclarationNameInfo NameInfo(Name, ClassLoc); 7596 CXXMethodDecl *CopyAssignment 7597 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7598 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7599 /*TInfo=*/0, /*isStatic=*/false, 7600 /*StorageClassAsWritten=*/SC_None, 7601 /*isInline=*/true, /*isConstexpr=*/false, 7602 SourceLocation()); 7603 CopyAssignment->setAccess(AS_public); 7604 CopyAssignment->setDefaulted(); 7605 CopyAssignment->setImplicit(); 7606 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7607 7608 // Add the parameter to the operator. 7609 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7610 ClassLoc, ClassLoc, /*Id=*/0, 7611 ArgType, /*TInfo=*/0, 7612 SC_None, 7613 SC_None, 0); 7614 CopyAssignment->setParams(FromParam); 7615 7616 // Note that we have added this copy-assignment operator. 7617 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7618 7619 if (Scope *S = getScopeForContext(ClassDecl)) 7620 PushOnScopeChains(CopyAssignment, S, false); 7621 ClassDecl->addDecl(CopyAssignment); 7622 7623 // C++0x [class.copy]p19: 7624 // .... If the class definition does not explicitly declare a copy 7625 // assignment operator, there is no user-declared move constructor, and 7626 // there is no user-declared move assignment operator, a copy assignment 7627 // operator is implicitly declared as defaulted. 7628 if ((ClassDecl->hasUserDeclaredMoveConstructor() && 7629 !getLangOptions().MicrosoftMode) || 7630 ClassDecl->hasUserDeclaredMoveAssignment() || 7631 ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7632 CopyAssignment->setDeletedAsWritten(); 7633 7634 AddOverriddenMethods(ClassDecl, CopyAssignment); 7635 return CopyAssignment; 7636} 7637 7638void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7639 CXXMethodDecl *CopyAssignOperator) { 7640 assert((CopyAssignOperator->isDefaulted() && 7641 CopyAssignOperator->isOverloadedOperator() && 7642 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7643 !CopyAssignOperator->doesThisDeclarationHaveABody()) && 7644 "DefineImplicitCopyAssignment called for wrong function"); 7645 7646 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7647 7648 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7649 CopyAssignOperator->setInvalidDecl(); 7650 return; 7651 } 7652 7653 CopyAssignOperator->setUsed(); 7654 7655 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7656 DiagnosticErrorTrap Trap(Diags); 7657 7658 // C++0x [class.copy]p30: 7659 // The implicitly-defined or explicitly-defaulted copy assignment operator 7660 // for a non-union class X performs memberwise copy assignment of its 7661 // subobjects. The direct base classes of X are assigned first, in the 7662 // order of their declaration in the base-specifier-list, and then the 7663 // immediate non-static data members of X are assigned, in the order in 7664 // which they were declared in the class definition. 7665 7666 // The statements that form the synthesized function body. 7667 ASTOwningVector<Stmt*> Statements(*this); 7668 7669 // The parameter for the "other" object, which we are copying from. 7670 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7671 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7672 QualType OtherRefType = Other->getType(); 7673 if (const LValueReferenceType *OtherRef 7674 = OtherRefType->getAs<LValueReferenceType>()) { 7675 OtherRefType = OtherRef->getPointeeType(); 7676 OtherQuals = OtherRefType.getQualifiers(); 7677 } 7678 7679 // Our location for everything implicitly-generated. 7680 SourceLocation Loc = CopyAssignOperator->getLocation(); 7681 7682 // Construct a reference to the "other" object. We'll be using this 7683 // throughout the generated ASTs. 7684 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7685 assert(OtherRef && "Reference to parameter cannot fail!"); 7686 7687 // Construct the "this" pointer. We'll be using this throughout the generated 7688 // ASTs. 7689 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7690 assert(This && "Reference to this cannot fail!"); 7691 7692 // Assign base classes. 7693 bool Invalid = false; 7694 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7695 E = ClassDecl->bases_end(); Base != E; ++Base) { 7696 // Form the assignment: 7697 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7698 QualType BaseType = Base->getType().getUnqualifiedType(); 7699 if (!BaseType->isRecordType()) { 7700 Invalid = true; 7701 continue; 7702 } 7703 7704 CXXCastPath BasePath; 7705 BasePath.push_back(Base); 7706 7707 // Construct the "from" expression, which is an implicit cast to the 7708 // appropriately-qualified base type. 7709 Expr *From = OtherRef; 7710 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7711 CK_UncheckedDerivedToBase, 7712 VK_LValue, &BasePath).take(); 7713 7714 // Dereference "this". 7715 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7716 7717 // Implicitly cast "this" to the appropriately-qualified base type. 7718 To = ImpCastExprToType(To.take(), 7719 Context.getCVRQualifiedType(BaseType, 7720 CopyAssignOperator->getTypeQualifiers()), 7721 CK_UncheckedDerivedToBase, 7722 VK_LValue, &BasePath); 7723 7724 // Build the copy. 7725 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7726 To.get(), From, 7727 /*CopyingBaseSubobject=*/true, 7728 /*Copying=*/true); 7729 if (Copy.isInvalid()) { 7730 Diag(CurrentLocation, diag::note_member_synthesized_at) 7731 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7732 CopyAssignOperator->setInvalidDecl(); 7733 return; 7734 } 7735 7736 // Success! Record the copy. 7737 Statements.push_back(Copy.takeAs<Expr>()); 7738 } 7739 7740 // \brief Reference to the __builtin_memcpy function. 7741 Expr *BuiltinMemCpyRef = 0; 7742 // \brief Reference to the __builtin_objc_memmove_collectable function. 7743 Expr *CollectableMemCpyRef = 0; 7744 7745 // Assign non-static members. 7746 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7747 FieldEnd = ClassDecl->field_end(); 7748 Field != FieldEnd; ++Field) { 7749 if (Field->isUnnamedBitfield()) 7750 continue; 7751 7752 // Check for members of reference type; we can't copy those. 7753 if (Field->getType()->isReferenceType()) { 7754 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7755 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7756 Diag(Field->getLocation(), diag::note_declared_at); 7757 Diag(CurrentLocation, diag::note_member_synthesized_at) 7758 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7759 Invalid = true; 7760 continue; 7761 } 7762 7763 // Check for members of const-qualified, non-class type. 7764 QualType BaseType = Context.getBaseElementType(Field->getType()); 7765 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7766 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7767 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7768 Diag(Field->getLocation(), diag::note_declared_at); 7769 Diag(CurrentLocation, diag::note_member_synthesized_at) 7770 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7771 Invalid = true; 7772 continue; 7773 } 7774 7775 // Suppress assigning zero-width bitfields. 7776 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7777 continue; 7778 7779 QualType FieldType = Field->getType().getNonReferenceType(); 7780 if (FieldType->isIncompleteArrayType()) { 7781 assert(ClassDecl->hasFlexibleArrayMember() && 7782 "Incomplete array type is not valid"); 7783 continue; 7784 } 7785 7786 // Build references to the field in the object we're copying from and to. 7787 CXXScopeSpec SS; // Intentionally empty 7788 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7789 LookupMemberName); 7790 MemberLookup.addDecl(*Field); 7791 MemberLookup.resolveKind(); 7792 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7793 Loc, /*IsArrow=*/false, 7794 SS, SourceLocation(), 0, 7795 MemberLookup, 0); 7796 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7797 Loc, /*IsArrow=*/true, 7798 SS, SourceLocation(), 0, 7799 MemberLookup, 0); 7800 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7801 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7802 7803 // If the field should be copied with __builtin_memcpy rather than via 7804 // explicit assignments, do so. This optimization only applies for arrays 7805 // of scalars and arrays of class type with trivial copy-assignment 7806 // operators. 7807 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7808 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7809 // Compute the size of the memory buffer to be copied. 7810 QualType SizeType = Context.getSizeType(); 7811 llvm::APInt Size(Context.getTypeSize(SizeType), 7812 Context.getTypeSizeInChars(BaseType).getQuantity()); 7813 for (const ConstantArrayType *Array 7814 = Context.getAsConstantArrayType(FieldType); 7815 Array; 7816 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7817 llvm::APInt ArraySize 7818 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7819 Size *= ArraySize; 7820 } 7821 7822 // Take the address of the field references for "from" and "to". 7823 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7824 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7825 7826 bool NeedsCollectableMemCpy = 7827 (BaseType->isRecordType() && 7828 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7829 7830 if (NeedsCollectableMemCpy) { 7831 if (!CollectableMemCpyRef) { 7832 // Create a reference to the __builtin_objc_memmove_collectable function. 7833 LookupResult R(*this, 7834 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7835 Loc, LookupOrdinaryName); 7836 LookupName(R, TUScope, true); 7837 7838 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7839 if (!CollectableMemCpy) { 7840 // Something went horribly wrong earlier, and we will have 7841 // complained about it. 7842 Invalid = true; 7843 continue; 7844 } 7845 7846 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7847 CollectableMemCpy->getType(), 7848 VK_LValue, Loc, 0).take(); 7849 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7850 } 7851 } 7852 // Create a reference to the __builtin_memcpy builtin function. 7853 else if (!BuiltinMemCpyRef) { 7854 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7855 LookupOrdinaryName); 7856 LookupName(R, TUScope, true); 7857 7858 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7859 if (!BuiltinMemCpy) { 7860 // Something went horribly wrong earlier, and we will have complained 7861 // about it. 7862 Invalid = true; 7863 continue; 7864 } 7865 7866 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7867 BuiltinMemCpy->getType(), 7868 VK_LValue, Loc, 0).take(); 7869 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7870 } 7871 7872 ASTOwningVector<Expr*> CallArgs(*this); 7873 CallArgs.push_back(To.takeAs<Expr>()); 7874 CallArgs.push_back(From.takeAs<Expr>()); 7875 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7876 ExprResult Call = ExprError(); 7877 if (NeedsCollectableMemCpy) 7878 Call = ActOnCallExpr(/*Scope=*/0, 7879 CollectableMemCpyRef, 7880 Loc, move_arg(CallArgs), 7881 Loc); 7882 else 7883 Call = ActOnCallExpr(/*Scope=*/0, 7884 BuiltinMemCpyRef, 7885 Loc, move_arg(CallArgs), 7886 Loc); 7887 7888 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7889 Statements.push_back(Call.takeAs<Expr>()); 7890 continue; 7891 } 7892 7893 // Build the copy of this field. 7894 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7895 To.get(), From.get(), 7896 /*CopyingBaseSubobject=*/false, 7897 /*Copying=*/true); 7898 if (Copy.isInvalid()) { 7899 Diag(CurrentLocation, diag::note_member_synthesized_at) 7900 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7901 CopyAssignOperator->setInvalidDecl(); 7902 return; 7903 } 7904 7905 // Success! Record the copy. 7906 Statements.push_back(Copy.takeAs<Stmt>()); 7907 } 7908 7909 if (!Invalid) { 7910 // Add a "return *this;" 7911 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7912 7913 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7914 if (Return.isInvalid()) 7915 Invalid = true; 7916 else { 7917 Statements.push_back(Return.takeAs<Stmt>()); 7918 7919 if (Trap.hasErrorOccurred()) { 7920 Diag(CurrentLocation, diag::note_member_synthesized_at) 7921 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7922 Invalid = true; 7923 } 7924 } 7925 } 7926 7927 if (Invalid) { 7928 CopyAssignOperator->setInvalidDecl(); 7929 return; 7930 } 7931 7932 StmtResult Body; 7933 { 7934 CompoundScopeRAII CompoundScope(*this); 7935 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7936 /*isStmtExpr=*/false); 7937 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7938 } 7939 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7940 7941 if (ASTMutationListener *L = getASTMutationListener()) { 7942 L->CompletedImplicitDefinition(CopyAssignOperator); 7943 } 7944} 7945 7946Sema::ImplicitExceptionSpecification 7947Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7948 ImplicitExceptionSpecification ExceptSpec(Context); 7949 7950 if (ClassDecl->isInvalidDecl()) 7951 return ExceptSpec; 7952 7953 // C++0x [except.spec]p14: 7954 // An implicitly declared special member function (Clause 12) shall have an 7955 // exception-specification. [...] 7956 7957 // It is unspecified whether or not an implicit move assignment operator 7958 // attempts to deduplicate calls to assignment operators of virtual bases are 7959 // made. As such, this exception specification is effectively unspecified. 7960 // Based on a similar decision made for constness in C++0x, we're erring on 7961 // the side of assuming such calls to be made regardless of whether they 7962 // actually happen. 7963 // Note that a move constructor is not implicitly declared when there are 7964 // virtual bases, but it can still be user-declared and explicitly defaulted. 7965 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7966 BaseEnd = ClassDecl->bases_end(); 7967 Base != BaseEnd; ++Base) { 7968 if (Base->isVirtual()) 7969 continue; 7970 7971 CXXRecordDecl *BaseClassDecl 7972 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7973 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7974 false, 0)) 7975 ExceptSpec.CalledDecl(MoveAssign); 7976 } 7977 7978 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7979 BaseEnd = ClassDecl->vbases_end(); 7980 Base != BaseEnd; ++Base) { 7981 CXXRecordDecl *BaseClassDecl 7982 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7983 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7984 false, 0)) 7985 ExceptSpec.CalledDecl(MoveAssign); 7986 } 7987 7988 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7989 FieldEnd = ClassDecl->field_end(); 7990 Field != FieldEnd; 7991 ++Field) { 7992 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 7993 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7994 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7995 false, 0)) 7996 ExceptSpec.CalledDecl(MoveAssign); 7997 } 7998 } 7999 8000 return ExceptSpec; 8001} 8002 8003CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8004 // Note: The following rules are largely analoguous to the move 8005 // constructor rules. 8006 8007 ImplicitExceptionSpecification Spec( 8008 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8009 8010 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8011 QualType RetType = Context.getLValueReferenceType(ArgType); 8012 ArgType = Context.getRValueReferenceType(ArgType); 8013 8014 // An implicitly-declared move assignment operator is an inline public 8015 // member of its class. 8016 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8017 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8018 SourceLocation ClassLoc = ClassDecl->getLocation(); 8019 DeclarationNameInfo NameInfo(Name, ClassLoc); 8020 CXXMethodDecl *MoveAssignment 8021 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8022 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8023 /*TInfo=*/0, /*isStatic=*/false, 8024 /*StorageClassAsWritten=*/SC_None, 8025 /*isInline=*/true, 8026 /*isConstexpr=*/false, 8027 SourceLocation()); 8028 MoveAssignment->setAccess(AS_public); 8029 MoveAssignment->setDefaulted(); 8030 MoveAssignment->setImplicit(); 8031 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8032 8033 // Add the parameter to the operator. 8034 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8035 ClassLoc, ClassLoc, /*Id=*/0, 8036 ArgType, /*TInfo=*/0, 8037 SC_None, 8038 SC_None, 0); 8039 MoveAssignment->setParams(FromParam); 8040 8041 // Note that we have added this copy-assignment operator. 8042 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8043 8044 // C++0x [class.copy]p9: 8045 // If the definition of a class X does not explicitly declare a move 8046 // assignment operator, one will be implicitly declared as defaulted if and 8047 // only if: 8048 // [...] 8049 // - the move assignment operator would not be implicitly defined as 8050 // deleted. 8051 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8052 // Cache this result so that we don't try to generate this over and over 8053 // on every lookup, leaking memory and wasting time. 8054 ClassDecl->setFailedImplicitMoveAssignment(); 8055 return 0; 8056 } 8057 8058 if (Scope *S = getScopeForContext(ClassDecl)) 8059 PushOnScopeChains(MoveAssignment, S, false); 8060 ClassDecl->addDecl(MoveAssignment); 8061 8062 AddOverriddenMethods(ClassDecl, MoveAssignment); 8063 return MoveAssignment; 8064} 8065 8066void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8067 CXXMethodDecl *MoveAssignOperator) { 8068 assert((MoveAssignOperator->isDefaulted() && 8069 MoveAssignOperator->isOverloadedOperator() && 8070 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8071 !MoveAssignOperator->doesThisDeclarationHaveABody()) && 8072 "DefineImplicitMoveAssignment called for wrong function"); 8073 8074 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8075 8076 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8077 MoveAssignOperator->setInvalidDecl(); 8078 return; 8079 } 8080 8081 MoveAssignOperator->setUsed(); 8082 8083 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8084 DiagnosticErrorTrap Trap(Diags); 8085 8086 // C++0x [class.copy]p28: 8087 // The implicitly-defined or move assignment operator for a non-union class 8088 // X performs memberwise move assignment of its subobjects. The direct base 8089 // classes of X are assigned first, in the order of their declaration in the 8090 // base-specifier-list, and then the immediate non-static data members of X 8091 // are assigned, in the order in which they were declared in the class 8092 // definition. 8093 8094 // The statements that form the synthesized function body. 8095 ASTOwningVector<Stmt*> Statements(*this); 8096 8097 // The parameter for the "other" object, which we are move from. 8098 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8099 QualType OtherRefType = Other->getType()-> 8100 getAs<RValueReferenceType>()->getPointeeType(); 8101 assert(OtherRefType.getQualifiers() == 0 && 8102 "Bad argument type of defaulted move assignment"); 8103 8104 // Our location for everything implicitly-generated. 8105 SourceLocation Loc = MoveAssignOperator->getLocation(); 8106 8107 // Construct a reference to the "other" object. We'll be using this 8108 // throughout the generated ASTs. 8109 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8110 assert(OtherRef && "Reference to parameter cannot fail!"); 8111 // Cast to rvalue. 8112 OtherRef = CastForMoving(*this, OtherRef); 8113 8114 // Construct the "this" pointer. We'll be using this throughout the generated 8115 // ASTs. 8116 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8117 assert(This && "Reference to this cannot fail!"); 8118 8119 // Assign base classes. 8120 bool Invalid = false; 8121 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8122 E = ClassDecl->bases_end(); Base != E; ++Base) { 8123 // Form the assignment: 8124 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8125 QualType BaseType = Base->getType().getUnqualifiedType(); 8126 if (!BaseType->isRecordType()) { 8127 Invalid = true; 8128 continue; 8129 } 8130 8131 CXXCastPath BasePath; 8132 BasePath.push_back(Base); 8133 8134 // Construct the "from" expression, which is an implicit cast to the 8135 // appropriately-qualified base type. 8136 Expr *From = OtherRef; 8137 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8138 VK_XValue, &BasePath).take(); 8139 8140 // Dereference "this". 8141 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8142 8143 // Implicitly cast "this" to the appropriately-qualified base type. 8144 To = ImpCastExprToType(To.take(), 8145 Context.getCVRQualifiedType(BaseType, 8146 MoveAssignOperator->getTypeQualifiers()), 8147 CK_UncheckedDerivedToBase, 8148 VK_LValue, &BasePath); 8149 8150 // Build the move. 8151 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8152 To.get(), From, 8153 /*CopyingBaseSubobject=*/true, 8154 /*Copying=*/false); 8155 if (Move.isInvalid()) { 8156 Diag(CurrentLocation, diag::note_member_synthesized_at) 8157 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8158 MoveAssignOperator->setInvalidDecl(); 8159 return; 8160 } 8161 8162 // Success! Record the move. 8163 Statements.push_back(Move.takeAs<Expr>()); 8164 } 8165 8166 // \brief Reference to the __builtin_memcpy function. 8167 Expr *BuiltinMemCpyRef = 0; 8168 // \brief Reference to the __builtin_objc_memmove_collectable function. 8169 Expr *CollectableMemCpyRef = 0; 8170 8171 // Assign non-static members. 8172 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8173 FieldEnd = ClassDecl->field_end(); 8174 Field != FieldEnd; ++Field) { 8175 if (Field->isUnnamedBitfield()) 8176 continue; 8177 8178 // Check for members of reference type; we can't move those. 8179 if (Field->getType()->isReferenceType()) { 8180 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8181 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8182 Diag(Field->getLocation(), diag::note_declared_at); 8183 Diag(CurrentLocation, diag::note_member_synthesized_at) 8184 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8185 Invalid = true; 8186 continue; 8187 } 8188 8189 // Check for members of const-qualified, non-class type. 8190 QualType BaseType = Context.getBaseElementType(Field->getType()); 8191 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8192 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8193 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8194 Diag(Field->getLocation(), diag::note_declared_at); 8195 Diag(CurrentLocation, diag::note_member_synthesized_at) 8196 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8197 Invalid = true; 8198 continue; 8199 } 8200 8201 // Suppress assigning zero-width bitfields. 8202 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8203 continue; 8204 8205 QualType FieldType = Field->getType().getNonReferenceType(); 8206 if (FieldType->isIncompleteArrayType()) { 8207 assert(ClassDecl->hasFlexibleArrayMember() && 8208 "Incomplete array type is not valid"); 8209 continue; 8210 } 8211 8212 // Build references to the field in the object we're copying from and to. 8213 CXXScopeSpec SS; // Intentionally empty 8214 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8215 LookupMemberName); 8216 MemberLookup.addDecl(*Field); 8217 MemberLookup.resolveKind(); 8218 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8219 Loc, /*IsArrow=*/false, 8220 SS, SourceLocation(), 0, 8221 MemberLookup, 0); 8222 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8223 Loc, /*IsArrow=*/true, 8224 SS, SourceLocation(), 0, 8225 MemberLookup, 0); 8226 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8227 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8228 8229 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8230 "Member reference with rvalue base must be rvalue except for reference " 8231 "members, which aren't allowed for move assignment."); 8232 8233 // If the field should be copied with __builtin_memcpy rather than via 8234 // explicit assignments, do so. This optimization only applies for arrays 8235 // of scalars and arrays of class type with trivial move-assignment 8236 // operators. 8237 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8238 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8239 // Compute the size of the memory buffer to be copied. 8240 QualType SizeType = Context.getSizeType(); 8241 llvm::APInt Size(Context.getTypeSize(SizeType), 8242 Context.getTypeSizeInChars(BaseType).getQuantity()); 8243 for (const ConstantArrayType *Array 8244 = Context.getAsConstantArrayType(FieldType); 8245 Array; 8246 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8247 llvm::APInt ArraySize 8248 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8249 Size *= ArraySize; 8250 } 8251 8252 // Take the address of the field references for "from" and "to". We 8253 // directly construct UnaryOperators here because semantic analysis 8254 // does not permit us to take the address of an xvalue. 8255 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8256 Context.getPointerType(From.get()->getType()), 8257 VK_RValue, OK_Ordinary, Loc); 8258 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8259 Context.getPointerType(To.get()->getType()), 8260 VK_RValue, OK_Ordinary, Loc); 8261 8262 bool NeedsCollectableMemCpy = 8263 (BaseType->isRecordType() && 8264 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8265 8266 if (NeedsCollectableMemCpy) { 8267 if (!CollectableMemCpyRef) { 8268 // Create a reference to the __builtin_objc_memmove_collectable function. 8269 LookupResult R(*this, 8270 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8271 Loc, LookupOrdinaryName); 8272 LookupName(R, TUScope, true); 8273 8274 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8275 if (!CollectableMemCpy) { 8276 // Something went horribly wrong earlier, and we will have 8277 // complained about it. 8278 Invalid = true; 8279 continue; 8280 } 8281 8282 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8283 CollectableMemCpy->getType(), 8284 VK_LValue, Loc, 0).take(); 8285 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8286 } 8287 } 8288 // Create a reference to the __builtin_memcpy builtin function. 8289 else if (!BuiltinMemCpyRef) { 8290 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8291 LookupOrdinaryName); 8292 LookupName(R, TUScope, true); 8293 8294 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8295 if (!BuiltinMemCpy) { 8296 // Something went horribly wrong earlier, and we will have complained 8297 // about it. 8298 Invalid = true; 8299 continue; 8300 } 8301 8302 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8303 BuiltinMemCpy->getType(), 8304 VK_LValue, Loc, 0).take(); 8305 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8306 } 8307 8308 ASTOwningVector<Expr*> CallArgs(*this); 8309 CallArgs.push_back(To.takeAs<Expr>()); 8310 CallArgs.push_back(From.takeAs<Expr>()); 8311 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8312 ExprResult Call = ExprError(); 8313 if (NeedsCollectableMemCpy) 8314 Call = ActOnCallExpr(/*Scope=*/0, 8315 CollectableMemCpyRef, 8316 Loc, move_arg(CallArgs), 8317 Loc); 8318 else 8319 Call = ActOnCallExpr(/*Scope=*/0, 8320 BuiltinMemCpyRef, 8321 Loc, move_arg(CallArgs), 8322 Loc); 8323 8324 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8325 Statements.push_back(Call.takeAs<Expr>()); 8326 continue; 8327 } 8328 8329 // Build the move of this field. 8330 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8331 To.get(), From.get(), 8332 /*CopyingBaseSubobject=*/false, 8333 /*Copying=*/false); 8334 if (Move.isInvalid()) { 8335 Diag(CurrentLocation, diag::note_member_synthesized_at) 8336 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8337 MoveAssignOperator->setInvalidDecl(); 8338 return; 8339 } 8340 8341 // Success! Record the copy. 8342 Statements.push_back(Move.takeAs<Stmt>()); 8343 } 8344 8345 if (!Invalid) { 8346 // Add a "return *this;" 8347 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8348 8349 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8350 if (Return.isInvalid()) 8351 Invalid = true; 8352 else { 8353 Statements.push_back(Return.takeAs<Stmt>()); 8354 8355 if (Trap.hasErrorOccurred()) { 8356 Diag(CurrentLocation, diag::note_member_synthesized_at) 8357 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8358 Invalid = true; 8359 } 8360 } 8361 } 8362 8363 if (Invalid) { 8364 MoveAssignOperator->setInvalidDecl(); 8365 return; 8366 } 8367 8368 StmtResult Body; 8369 { 8370 CompoundScopeRAII CompoundScope(*this); 8371 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8372 /*isStmtExpr=*/false); 8373 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8374 } 8375 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8376 8377 if (ASTMutationListener *L = getASTMutationListener()) { 8378 L->CompletedImplicitDefinition(MoveAssignOperator); 8379 } 8380} 8381 8382std::pair<Sema::ImplicitExceptionSpecification, bool> 8383Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8384 if (ClassDecl->isInvalidDecl()) 8385 return std::make_pair(ImplicitExceptionSpecification(Context), false); 8386 8387 // C++ [class.copy]p5: 8388 // The implicitly-declared copy constructor for a class X will 8389 // have the form 8390 // 8391 // X::X(const X&) 8392 // 8393 // if 8394 // FIXME: It ought to be possible to store this on the record. 8395 bool HasConstCopyConstructor = true; 8396 8397 // -- each direct or virtual base class B of X has a copy 8398 // constructor whose first parameter is of type const B& or 8399 // const volatile B&, and 8400 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8401 BaseEnd = ClassDecl->bases_end(); 8402 HasConstCopyConstructor && Base != BaseEnd; 8403 ++Base) { 8404 // Virtual bases are handled below. 8405 if (Base->isVirtual()) 8406 continue; 8407 8408 CXXRecordDecl *BaseClassDecl 8409 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8410 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8411 &HasConstCopyConstructor); 8412 } 8413 8414 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8415 BaseEnd = ClassDecl->vbases_end(); 8416 HasConstCopyConstructor && Base != BaseEnd; 8417 ++Base) { 8418 CXXRecordDecl *BaseClassDecl 8419 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8420 LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const, 8421 &HasConstCopyConstructor); 8422 } 8423 8424 // -- for all the nonstatic data members of X that are of a 8425 // class type M (or array thereof), each such class type 8426 // has a copy constructor whose first parameter is of type 8427 // const M& or const volatile M&. 8428 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8429 FieldEnd = ClassDecl->field_end(); 8430 HasConstCopyConstructor && Field != FieldEnd; 8431 ++Field) { 8432 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8433 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8434 LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const, 8435 &HasConstCopyConstructor); 8436 } 8437 } 8438 // Otherwise, the implicitly declared copy constructor will have 8439 // the form 8440 // 8441 // X::X(X&) 8442 8443 // C++ [except.spec]p14: 8444 // An implicitly declared special member function (Clause 12) shall have an 8445 // exception-specification. [...] 8446 ImplicitExceptionSpecification ExceptSpec(Context); 8447 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8448 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8449 BaseEnd = ClassDecl->bases_end(); 8450 Base != BaseEnd; 8451 ++Base) { 8452 // Virtual bases are handled below. 8453 if (Base->isVirtual()) 8454 continue; 8455 8456 CXXRecordDecl *BaseClassDecl 8457 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8458 if (CXXConstructorDecl *CopyConstructor = 8459 LookupCopyingConstructor(BaseClassDecl, Quals)) 8460 ExceptSpec.CalledDecl(CopyConstructor); 8461 } 8462 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8463 BaseEnd = ClassDecl->vbases_end(); 8464 Base != BaseEnd; 8465 ++Base) { 8466 CXXRecordDecl *BaseClassDecl 8467 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8468 if (CXXConstructorDecl *CopyConstructor = 8469 LookupCopyingConstructor(BaseClassDecl, Quals)) 8470 ExceptSpec.CalledDecl(CopyConstructor); 8471 } 8472 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8473 FieldEnd = ClassDecl->field_end(); 8474 Field != FieldEnd; 8475 ++Field) { 8476 QualType FieldType = Context.getBaseElementType((*Field)->getType()); 8477 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8478 if (CXXConstructorDecl *CopyConstructor = 8479 LookupCopyingConstructor(FieldClassDecl, Quals)) 8480 ExceptSpec.CalledDecl(CopyConstructor); 8481 } 8482 } 8483 8484 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8485} 8486 8487CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8488 CXXRecordDecl *ClassDecl) { 8489 // C++ [class.copy]p4: 8490 // If the class definition does not explicitly declare a copy 8491 // constructor, one is declared implicitly. 8492 8493 ImplicitExceptionSpecification Spec(Context); 8494 bool Const; 8495 llvm::tie(Spec, Const) = 8496 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8497 8498 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8499 QualType ArgType = ClassType; 8500 if (Const) 8501 ArgType = ArgType.withConst(); 8502 ArgType = Context.getLValueReferenceType(ArgType); 8503 8504 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8505 8506 DeclarationName Name 8507 = Context.DeclarationNames.getCXXConstructorName( 8508 Context.getCanonicalType(ClassType)); 8509 SourceLocation ClassLoc = ClassDecl->getLocation(); 8510 DeclarationNameInfo NameInfo(Name, ClassLoc); 8511 8512 // An implicitly-declared copy constructor is an inline public 8513 // member of its class. 8514 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8515 Context, ClassDecl, ClassLoc, NameInfo, 8516 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8517 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8518 /*isConstexpr=*/ClassDecl->defaultedCopyConstructorIsConstexpr() && 8519 getLangOptions().CPlusPlus0x); 8520 CopyConstructor->setAccess(AS_public); 8521 CopyConstructor->setDefaulted(); 8522 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8523 8524 // Note that we have declared this constructor. 8525 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8526 8527 // Add the parameter to the constructor. 8528 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8529 ClassLoc, ClassLoc, 8530 /*IdentifierInfo=*/0, 8531 ArgType, /*TInfo=*/0, 8532 SC_None, 8533 SC_None, 0); 8534 CopyConstructor->setParams(FromParam); 8535 8536 if (Scope *S = getScopeForContext(ClassDecl)) 8537 PushOnScopeChains(CopyConstructor, S, false); 8538 ClassDecl->addDecl(CopyConstructor); 8539 8540 // C++11 [class.copy]p8: 8541 // ... If the class definition does not explicitly declare a copy 8542 // constructor, there is no user-declared move constructor, and there is no 8543 // user-declared move assignment operator, a copy constructor is implicitly 8544 // declared as defaulted. 8545 if (ClassDecl->hasUserDeclaredMoveConstructor() || 8546 (ClassDecl->hasUserDeclaredMoveAssignment() && 8547 !getLangOptions().MicrosoftMode) || 8548 ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8549 CopyConstructor->setDeletedAsWritten(); 8550 8551 return CopyConstructor; 8552} 8553 8554void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8555 CXXConstructorDecl *CopyConstructor) { 8556 assert((CopyConstructor->isDefaulted() && 8557 CopyConstructor->isCopyConstructor() && 8558 !CopyConstructor->doesThisDeclarationHaveABody()) && 8559 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8560 8561 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8562 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8563 8564 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8565 DiagnosticErrorTrap Trap(Diags); 8566 8567 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8568 Trap.hasErrorOccurred()) { 8569 Diag(CurrentLocation, diag::note_member_synthesized_at) 8570 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8571 CopyConstructor->setInvalidDecl(); 8572 } else { 8573 Sema::CompoundScopeRAII CompoundScope(*this); 8574 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8575 CopyConstructor->getLocation(), 8576 MultiStmtArg(*this, 0, 0), 8577 /*isStmtExpr=*/false) 8578 .takeAs<Stmt>()); 8579 CopyConstructor->setImplicitlyDefined(true); 8580 } 8581 8582 CopyConstructor->setUsed(); 8583 if (ASTMutationListener *L = getASTMutationListener()) { 8584 L->CompletedImplicitDefinition(CopyConstructor); 8585 } 8586} 8587 8588Sema::ImplicitExceptionSpecification 8589Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8590 // C++ [except.spec]p14: 8591 // An implicitly declared special member function (Clause 12) shall have an 8592 // exception-specification. [...] 8593 ImplicitExceptionSpecification ExceptSpec(Context); 8594 if (ClassDecl->isInvalidDecl()) 8595 return ExceptSpec; 8596 8597 // Direct base-class constructors. 8598 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8599 BEnd = ClassDecl->bases_end(); 8600 B != BEnd; ++B) { 8601 if (B->isVirtual()) // Handled below. 8602 continue; 8603 8604 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8605 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8606 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8607 // If this is a deleted function, add it anyway. This might be conformant 8608 // with the standard. This might not. I'm not sure. It might not matter. 8609 if (Constructor) 8610 ExceptSpec.CalledDecl(Constructor); 8611 } 8612 } 8613 8614 // Virtual base-class constructors. 8615 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8616 BEnd = ClassDecl->vbases_end(); 8617 B != BEnd; ++B) { 8618 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8619 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8620 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8621 // If this is a deleted function, add it anyway. This might be conformant 8622 // with the standard. This might not. I'm not sure. It might not matter. 8623 if (Constructor) 8624 ExceptSpec.CalledDecl(Constructor); 8625 } 8626 } 8627 8628 // Field constructors. 8629 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8630 FEnd = ClassDecl->field_end(); 8631 F != FEnd; ++F) { 8632 if (const RecordType *RecordTy 8633 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8634 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8635 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8636 // If this is a deleted function, add it anyway. This might be conformant 8637 // with the standard. This might not. I'm not sure. It might not matter. 8638 // In particular, the problem is that this function never gets called. It 8639 // might just be ill-formed because this function attempts to refer to 8640 // a deleted function here. 8641 if (Constructor) 8642 ExceptSpec.CalledDecl(Constructor); 8643 } 8644 } 8645 8646 return ExceptSpec; 8647} 8648 8649CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8650 CXXRecordDecl *ClassDecl) { 8651 ImplicitExceptionSpecification Spec( 8652 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8653 8654 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8655 QualType ArgType = Context.getRValueReferenceType(ClassType); 8656 8657 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8658 8659 DeclarationName Name 8660 = Context.DeclarationNames.getCXXConstructorName( 8661 Context.getCanonicalType(ClassType)); 8662 SourceLocation ClassLoc = ClassDecl->getLocation(); 8663 DeclarationNameInfo NameInfo(Name, ClassLoc); 8664 8665 // C++0x [class.copy]p11: 8666 // An implicitly-declared copy/move constructor is an inline public 8667 // member of its class. 8668 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8669 Context, ClassDecl, ClassLoc, NameInfo, 8670 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8671 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8672 /*isConstexpr=*/ClassDecl->defaultedMoveConstructorIsConstexpr() && 8673 getLangOptions().CPlusPlus0x); 8674 MoveConstructor->setAccess(AS_public); 8675 MoveConstructor->setDefaulted(); 8676 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8677 8678 // Add the parameter to the constructor. 8679 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8680 ClassLoc, ClassLoc, 8681 /*IdentifierInfo=*/0, 8682 ArgType, /*TInfo=*/0, 8683 SC_None, 8684 SC_None, 0); 8685 MoveConstructor->setParams(FromParam); 8686 8687 // C++0x [class.copy]p9: 8688 // If the definition of a class X does not explicitly declare a move 8689 // constructor, one will be implicitly declared as defaulted if and only if: 8690 // [...] 8691 // - the move constructor would not be implicitly defined as deleted. 8692 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8693 // Cache this result so that we don't try to generate this over and over 8694 // on every lookup, leaking memory and wasting time. 8695 ClassDecl->setFailedImplicitMoveConstructor(); 8696 return 0; 8697 } 8698 8699 // Note that we have declared this constructor. 8700 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8701 8702 if (Scope *S = getScopeForContext(ClassDecl)) 8703 PushOnScopeChains(MoveConstructor, S, false); 8704 ClassDecl->addDecl(MoveConstructor); 8705 8706 return MoveConstructor; 8707} 8708 8709void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8710 CXXConstructorDecl *MoveConstructor) { 8711 assert((MoveConstructor->isDefaulted() && 8712 MoveConstructor->isMoveConstructor() && 8713 !MoveConstructor->doesThisDeclarationHaveABody()) && 8714 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8715 8716 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8717 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8718 8719 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8720 DiagnosticErrorTrap Trap(Diags); 8721 8722 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8723 Trap.hasErrorOccurred()) { 8724 Diag(CurrentLocation, diag::note_member_synthesized_at) 8725 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8726 MoveConstructor->setInvalidDecl(); 8727 } else { 8728 Sema::CompoundScopeRAII CompoundScope(*this); 8729 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8730 MoveConstructor->getLocation(), 8731 MultiStmtArg(*this, 0, 0), 8732 /*isStmtExpr=*/false) 8733 .takeAs<Stmt>()); 8734 MoveConstructor->setImplicitlyDefined(true); 8735 } 8736 8737 MoveConstructor->setUsed(); 8738 8739 if (ASTMutationListener *L = getASTMutationListener()) { 8740 L->CompletedImplicitDefinition(MoveConstructor); 8741 } 8742} 8743 8744bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8745 return FD->isDeleted() && 8746 (FD->isDefaulted() || FD->isImplicit()) && 8747 isa<CXXMethodDecl>(FD); 8748} 8749 8750/// \brief Mark the call operator of the given lambda closure type as "used". 8751static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8752 CXXMethodDecl *CallOperator 8753 = cast<CXXMethodDecl>( 8754 *Lambda->lookup( 8755 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8756 CallOperator->setReferenced(); 8757 CallOperator->setUsed(); 8758} 8759 8760void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8761 SourceLocation CurrentLocation, 8762 CXXConversionDecl *Conv) 8763{ 8764 CXXRecordDecl *Lambda = Conv->getParent(); 8765 8766 // Make sure that the lambda call operator is marked used. 8767 markLambdaCallOperatorUsed(*this, Lambda); 8768 8769 Conv->setUsed(); 8770 8771 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8772 DiagnosticErrorTrap Trap(Diags); 8773 8774 // Return the address of the __invoke function. 8775 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8776 CXXMethodDecl *Invoke 8777 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8778 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8779 VK_LValue, Conv->getLocation()).take(); 8780 assert(FunctionRef && "Can't refer to __invoke function?"); 8781 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8782 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8783 Conv->getLocation(), 8784 Conv->getLocation())); 8785 8786 // Fill in the __invoke function with a dummy implementation. IR generation 8787 // will fill in the actual details. 8788 Invoke->setUsed(); 8789 Invoke->setReferenced(); 8790 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8791 Conv->getLocation())); 8792 8793 if (ASTMutationListener *L = getASTMutationListener()) { 8794 L->CompletedImplicitDefinition(Conv); 8795 L->CompletedImplicitDefinition(Invoke); 8796 } 8797} 8798 8799void Sema::DefineImplicitLambdaToBlockPointerConversion( 8800 SourceLocation CurrentLocation, 8801 CXXConversionDecl *Conv) 8802{ 8803 // Make sure that the lambda call operator is marked used. 8804 markLambdaCallOperatorUsed(*this, Conv->getParent()); 8805 Conv->setUsed(); 8806 8807 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8808 DiagnosticErrorTrap Trap(Diags); 8809 8810 // Copy-initialize the lambda object as needed to capture 8811 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8812 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8813 ExprResult Init = PerformCopyInitialization( 8814 InitializedEntity::InitializeBlock(CurrentLocation, 8815 DerefThis->getType(), 8816 /*NRVO=*/false), 8817 CurrentLocation, DerefThis); 8818 if (!Init.isInvalid()) 8819 Init = ActOnFinishFullExpr(Init.take()); 8820 8821 if (!Init.isInvalid()) 8822 Conv->setLambdaToBlockPointerCopyInit(Init.take()); 8823 else { 8824 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8825 } 8826 8827 // Introduce a bogus body, which IR generation will override anyway. 8828 Conv->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8829 Conv->getLocation())); 8830 8831 if (ASTMutationListener *L = getASTMutationListener()) { 8832 L->CompletedImplicitDefinition(Conv); 8833 } 8834} 8835 8836ExprResult 8837Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8838 CXXConstructorDecl *Constructor, 8839 MultiExprArg ExprArgs, 8840 bool HadMultipleCandidates, 8841 bool RequiresZeroInit, 8842 unsigned ConstructKind, 8843 SourceRange ParenRange) { 8844 bool Elidable = false; 8845 8846 // C++0x [class.copy]p34: 8847 // When certain criteria are met, an implementation is allowed to 8848 // omit the copy/move construction of a class object, even if the 8849 // copy/move constructor and/or destructor for the object have 8850 // side effects. [...] 8851 // - when a temporary class object that has not been bound to a 8852 // reference (12.2) would be copied/moved to a class object 8853 // with the same cv-unqualified type, the copy/move operation 8854 // can be omitted by constructing the temporary object 8855 // directly into the target of the omitted copy/move 8856 if (ConstructKind == CXXConstructExpr::CK_Complete && 8857 Constructor->isCopyOrMoveConstructor() && ExprArgs.size() >= 1) { 8858 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 8859 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 8860 } 8861 8862 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 8863 Elidable, move(ExprArgs), HadMultipleCandidates, 8864 RequiresZeroInit, ConstructKind, ParenRange); 8865} 8866 8867/// BuildCXXConstructExpr - Creates a complete call to a constructor, 8868/// including handling of its default argument expressions. 8869ExprResult 8870Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8871 CXXConstructorDecl *Constructor, bool Elidable, 8872 MultiExprArg ExprArgs, 8873 bool HadMultipleCandidates, 8874 bool RequiresZeroInit, 8875 unsigned ConstructKind, 8876 SourceRange ParenRange) { 8877 unsigned NumExprs = ExprArgs.size(); 8878 Expr **Exprs = (Expr **)ExprArgs.release(); 8879 8880 for (specific_attr_iterator<NonNullAttr> 8881 i = Constructor->specific_attr_begin<NonNullAttr>(), 8882 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 8883 const NonNullAttr *NonNull = *i; 8884 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 8885 } 8886 8887 MarkFunctionReferenced(ConstructLoc, Constructor); 8888 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 8889 Constructor, Elidable, Exprs, NumExprs, 8890 HadMultipleCandidates, /*FIXME*/false, 8891 RequiresZeroInit, 8892 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 8893 ParenRange)); 8894} 8895 8896bool Sema::InitializeVarWithConstructor(VarDecl *VD, 8897 CXXConstructorDecl *Constructor, 8898 MultiExprArg Exprs, 8899 bool HadMultipleCandidates) { 8900 // FIXME: Provide the correct paren SourceRange when available. 8901 ExprResult TempResult = 8902 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 8903 move(Exprs), HadMultipleCandidates, false, 8904 CXXConstructExpr::CK_Complete, SourceRange()); 8905 if (TempResult.isInvalid()) 8906 return true; 8907 8908 Expr *Temp = TempResult.takeAs<Expr>(); 8909 CheckImplicitConversions(Temp, VD->getLocation()); 8910 MarkFunctionReferenced(VD->getLocation(), Constructor); 8911 Temp = MaybeCreateExprWithCleanups(Temp); 8912 VD->setInit(Temp); 8913 8914 return false; 8915} 8916 8917void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 8918 if (VD->isInvalidDecl()) return; 8919 8920 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 8921 if (ClassDecl->isInvalidDecl()) return; 8922 if (ClassDecl->hasIrrelevantDestructor()) return; 8923 if (ClassDecl->isDependentContext()) return; 8924 8925 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 8926 MarkFunctionReferenced(VD->getLocation(), Destructor); 8927 CheckDestructorAccess(VD->getLocation(), Destructor, 8928 PDiag(diag::err_access_dtor_var) 8929 << VD->getDeclName() 8930 << VD->getType()); 8931 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 8932 8933 if (!VD->hasGlobalStorage()) return; 8934 8935 // Emit warning for non-trivial dtor in global scope (a real global, 8936 // class-static, function-static). 8937 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 8938 8939 // TODO: this should be re-enabled for static locals by !CXAAtExit 8940 if (!VD->isStaticLocal()) 8941 Diag(VD->getLocation(), diag::warn_global_destructor); 8942} 8943 8944/// \brief Given a constructor and the set of arguments provided for the 8945/// constructor, convert the arguments and add any required default arguments 8946/// to form a proper call to this constructor. 8947/// 8948/// \returns true if an error occurred, false otherwise. 8949bool 8950Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 8951 MultiExprArg ArgsPtr, 8952 SourceLocation Loc, 8953 ASTOwningVector<Expr*> &ConvertedArgs) { 8954 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 8955 unsigned NumArgs = ArgsPtr.size(); 8956 Expr **Args = (Expr **)ArgsPtr.get(); 8957 8958 const FunctionProtoType *Proto 8959 = Constructor->getType()->getAs<FunctionProtoType>(); 8960 assert(Proto && "Constructor without a prototype?"); 8961 unsigned NumArgsInProto = Proto->getNumArgs(); 8962 8963 // If too few arguments are available, we'll fill in the rest with defaults. 8964 if (NumArgs < NumArgsInProto) 8965 ConvertedArgs.reserve(NumArgsInProto); 8966 else 8967 ConvertedArgs.reserve(NumArgs); 8968 8969 VariadicCallType CallType = 8970 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 8971 SmallVector<Expr *, 8> AllArgs; 8972 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 8973 Proto, 0, Args, NumArgs, AllArgs, 8974 CallType); 8975 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 8976 return Invalid; 8977} 8978 8979static inline bool 8980CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 8981 const FunctionDecl *FnDecl) { 8982 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 8983 if (isa<NamespaceDecl>(DC)) { 8984 return SemaRef.Diag(FnDecl->getLocation(), 8985 diag::err_operator_new_delete_declared_in_namespace) 8986 << FnDecl->getDeclName(); 8987 } 8988 8989 if (isa<TranslationUnitDecl>(DC) && 8990 FnDecl->getStorageClass() == SC_Static) { 8991 return SemaRef.Diag(FnDecl->getLocation(), 8992 diag::err_operator_new_delete_declared_static) 8993 << FnDecl->getDeclName(); 8994 } 8995 8996 return false; 8997} 8998 8999static inline bool 9000CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9001 CanQualType ExpectedResultType, 9002 CanQualType ExpectedFirstParamType, 9003 unsigned DependentParamTypeDiag, 9004 unsigned InvalidParamTypeDiag) { 9005 QualType ResultType = 9006 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9007 9008 // Check that the result type is not dependent. 9009 if (ResultType->isDependentType()) 9010 return SemaRef.Diag(FnDecl->getLocation(), 9011 diag::err_operator_new_delete_dependent_result_type) 9012 << FnDecl->getDeclName() << ExpectedResultType; 9013 9014 // Check that the result type is what we expect. 9015 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9016 return SemaRef.Diag(FnDecl->getLocation(), 9017 diag::err_operator_new_delete_invalid_result_type) 9018 << FnDecl->getDeclName() << ExpectedResultType; 9019 9020 // A function template must have at least 2 parameters. 9021 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9022 return SemaRef.Diag(FnDecl->getLocation(), 9023 diag::err_operator_new_delete_template_too_few_parameters) 9024 << FnDecl->getDeclName(); 9025 9026 // The function decl must have at least 1 parameter. 9027 if (FnDecl->getNumParams() == 0) 9028 return SemaRef.Diag(FnDecl->getLocation(), 9029 diag::err_operator_new_delete_too_few_parameters) 9030 << FnDecl->getDeclName(); 9031 9032 // Check the the first parameter type is not dependent. 9033 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9034 if (FirstParamType->isDependentType()) 9035 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9036 << FnDecl->getDeclName() << ExpectedFirstParamType; 9037 9038 // Check that the first parameter type is what we expect. 9039 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9040 ExpectedFirstParamType) 9041 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9042 << FnDecl->getDeclName() << ExpectedFirstParamType; 9043 9044 return false; 9045} 9046 9047static bool 9048CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9049 // C++ [basic.stc.dynamic.allocation]p1: 9050 // A program is ill-formed if an allocation function is declared in a 9051 // namespace scope other than global scope or declared static in global 9052 // scope. 9053 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9054 return true; 9055 9056 CanQualType SizeTy = 9057 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9058 9059 // C++ [basic.stc.dynamic.allocation]p1: 9060 // The return type shall be void*. The first parameter shall have type 9061 // std::size_t. 9062 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9063 SizeTy, 9064 diag::err_operator_new_dependent_param_type, 9065 diag::err_operator_new_param_type)) 9066 return true; 9067 9068 // C++ [basic.stc.dynamic.allocation]p1: 9069 // The first parameter shall not have an associated default argument. 9070 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9071 return SemaRef.Diag(FnDecl->getLocation(), 9072 diag::err_operator_new_default_arg) 9073 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9074 9075 return false; 9076} 9077 9078static bool 9079CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9080 // C++ [basic.stc.dynamic.deallocation]p1: 9081 // A program is ill-formed if deallocation functions are declared in a 9082 // namespace scope other than global scope or declared static in global 9083 // scope. 9084 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9085 return true; 9086 9087 // C++ [basic.stc.dynamic.deallocation]p2: 9088 // Each deallocation function shall return void and its first parameter 9089 // shall be void*. 9090 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9091 SemaRef.Context.VoidPtrTy, 9092 diag::err_operator_delete_dependent_param_type, 9093 diag::err_operator_delete_param_type)) 9094 return true; 9095 9096 return false; 9097} 9098 9099/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9100/// of this overloaded operator is well-formed. If so, returns false; 9101/// otherwise, emits appropriate diagnostics and returns true. 9102bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9103 assert(FnDecl && FnDecl->isOverloadedOperator() && 9104 "Expected an overloaded operator declaration"); 9105 9106 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9107 9108 // C++ [over.oper]p5: 9109 // The allocation and deallocation functions, operator new, 9110 // operator new[], operator delete and operator delete[], are 9111 // described completely in 3.7.3. The attributes and restrictions 9112 // found in the rest of this subclause do not apply to them unless 9113 // explicitly stated in 3.7.3. 9114 if (Op == OO_Delete || Op == OO_Array_Delete) 9115 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9116 9117 if (Op == OO_New || Op == OO_Array_New) 9118 return CheckOperatorNewDeclaration(*this, FnDecl); 9119 9120 // C++ [over.oper]p6: 9121 // An operator function shall either be a non-static member 9122 // function or be a non-member function and have at least one 9123 // parameter whose type is a class, a reference to a class, an 9124 // enumeration, or a reference to an enumeration. 9125 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9126 if (MethodDecl->isStatic()) 9127 return Diag(FnDecl->getLocation(), 9128 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9129 } else { 9130 bool ClassOrEnumParam = false; 9131 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9132 ParamEnd = FnDecl->param_end(); 9133 Param != ParamEnd; ++Param) { 9134 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9135 if (ParamType->isDependentType() || ParamType->isRecordType() || 9136 ParamType->isEnumeralType()) { 9137 ClassOrEnumParam = true; 9138 break; 9139 } 9140 } 9141 9142 if (!ClassOrEnumParam) 9143 return Diag(FnDecl->getLocation(), 9144 diag::err_operator_overload_needs_class_or_enum) 9145 << FnDecl->getDeclName(); 9146 } 9147 9148 // C++ [over.oper]p8: 9149 // An operator function cannot have default arguments (8.3.6), 9150 // except where explicitly stated below. 9151 // 9152 // Only the function-call operator allows default arguments 9153 // (C++ [over.call]p1). 9154 if (Op != OO_Call) { 9155 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9156 Param != FnDecl->param_end(); ++Param) { 9157 if ((*Param)->hasDefaultArg()) 9158 return Diag((*Param)->getLocation(), 9159 diag::err_operator_overload_default_arg) 9160 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9161 } 9162 } 9163 9164 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9165 { false, false, false } 9166#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9167 , { Unary, Binary, MemberOnly } 9168#include "clang/Basic/OperatorKinds.def" 9169 }; 9170 9171 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9172 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9173 bool MustBeMemberOperator = OperatorUses[Op][2]; 9174 9175 // C++ [over.oper]p8: 9176 // [...] Operator functions cannot have more or fewer parameters 9177 // than the number required for the corresponding operator, as 9178 // described in the rest of this subclause. 9179 unsigned NumParams = FnDecl->getNumParams() 9180 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9181 if (Op != OO_Call && 9182 ((NumParams == 1 && !CanBeUnaryOperator) || 9183 (NumParams == 2 && !CanBeBinaryOperator) || 9184 (NumParams < 1) || (NumParams > 2))) { 9185 // We have the wrong number of parameters. 9186 unsigned ErrorKind; 9187 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9188 ErrorKind = 2; // 2 -> unary or binary. 9189 } else if (CanBeUnaryOperator) { 9190 ErrorKind = 0; // 0 -> unary 9191 } else { 9192 assert(CanBeBinaryOperator && 9193 "All non-call overloaded operators are unary or binary!"); 9194 ErrorKind = 1; // 1 -> binary 9195 } 9196 9197 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9198 << FnDecl->getDeclName() << NumParams << ErrorKind; 9199 } 9200 9201 // Overloaded operators other than operator() cannot be variadic. 9202 if (Op != OO_Call && 9203 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9204 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9205 << FnDecl->getDeclName(); 9206 } 9207 9208 // Some operators must be non-static member functions. 9209 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9210 return Diag(FnDecl->getLocation(), 9211 diag::err_operator_overload_must_be_member) 9212 << FnDecl->getDeclName(); 9213 } 9214 9215 // C++ [over.inc]p1: 9216 // The user-defined function called operator++ implements the 9217 // prefix and postfix ++ operator. If this function is a member 9218 // function with no parameters, or a non-member function with one 9219 // parameter of class or enumeration type, it defines the prefix 9220 // increment operator ++ for objects of that type. If the function 9221 // is a member function with one parameter (which shall be of type 9222 // int) or a non-member function with two parameters (the second 9223 // of which shall be of type int), it defines the postfix 9224 // increment operator ++ for objects of that type. 9225 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9226 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9227 bool ParamIsInt = false; 9228 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9229 ParamIsInt = BT->getKind() == BuiltinType::Int; 9230 9231 if (!ParamIsInt) 9232 return Diag(LastParam->getLocation(), 9233 diag::err_operator_overload_post_incdec_must_be_int) 9234 << LastParam->getType() << (Op == OO_MinusMinus); 9235 } 9236 9237 return false; 9238} 9239 9240/// CheckLiteralOperatorDeclaration - Check whether the declaration 9241/// of this literal operator function is well-formed. If so, returns 9242/// false; otherwise, emits appropriate diagnostics and returns true. 9243bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9244 DeclContext *DC = FnDecl->getDeclContext(); 9245 Decl::Kind Kind = DC->getDeclKind(); 9246 if (Kind != Decl::TranslationUnit && Kind != Decl::Namespace && 9247 Kind != Decl::LinkageSpec) { 9248 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9249 << FnDecl->getDeclName(); 9250 return true; 9251 } 9252 9253 bool Valid = false; 9254 9255 // template <char...> type operator "" name() is the only valid template 9256 // signature, and the only valid signature with no parameters. 9257 if (FnDecl->param_size() == 0) { 9258 if (FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate()) { 9259 // Must have only one template parameter 9260 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9261 if (Params->size() == 1) { 9262 NonTypeTemplateParmDecl *PmDecl = 9263 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9264 9265 // The template parameter must be a char parameter pack. 9266 if (PmDecl && PmDecl->isTemplateParameterPack() && 9267 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9268 Valid = true; 9269 } 9270 } 9271 } else { 9272 // Check the first parameter 9273 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9274 9275 QualType T = (*Param)->getType(); 9276 9277 // unsigned long long int, long double, and any character type are allowed 9278 // as the only parameters. 9279 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9280 Context.hasSameType(T, Context.LongDoubleTy) || 9281 Context.hasSameType(T, Context.CharTy) || 9282 Context.hasSameType(T, Context.WCharTy) || 9283 Context.hasSameType(T, Context.Char16Ty) || 9284 Context.hasSameType(T, Context.Char32Ty)) { 9285 if (++Param == FnDecl->param_end()) 9286 Valid = true; 9287 goto FinishedParams; 9288 } 9289 9290 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9291 const PointerType *PT = T->getAs<PointerType>(); 9292 if (!PT) 9293 goto FinishedParams; 9294 T = PT->getPointeeType(); 9295 if (!T.isConstQualified()) 9296 goto FinishedParams; 9297 T = T.getUnqualifiedType(); 9298 9299 // Move on to the second parameter; 9300 ++Param; 9301 9302 // If there is no second parameter, the first must be a const char * 9303 if (Param == FnDecl->param_end()) { 9304 if (Context.hasSameType(T, Context.CharTy)) 9305 Valid = true; 9306 goto FinishedParams; 9307 } 9308 9309 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9310 // are allowed as the first parameter to a two-parameter function 9311 if (!(Context.hasSameType(T, Context.CharTy) || 9312 Context.hasSameType(T, Context.WCharTy) || 9313 Context.hasSameType(T, Context.Char16Ty) || 9314 Context.hasSameType(T, Context.Char32Ty))) 9315 goto FinishedParams; 9316 9317 // The second and final parameter must be an std::size_t 9318 T = (*Param)->getType().getUnqualifiedType(); 9319 if (Context.hasSameType(T, Context.getSizeType()) && 9320 ++Param == FnDecl->param_end()) 9321 Valid = true; 9322 } 9323 9324 // FIXME: This diagnostic is absolutely terrible. 9325FinishedParams: 9326 if (!Valid) { 9327 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9328 << FnDecl->getDeclName(); 9329 return true; 9330 } 9331 9332 StringRef LiteralName 9333 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9334 if (LiteralName[0] != '_') { 9335 // C++0x [usrlit.suffix]p1: 9336 // Literal suffix identifiers that do not start with an underscore are 9337 // reserved for future standardization. 9338 bool IsHexFloat = true; 9339 if (LiteralName.size() > 1 && 9340 (LiteralName[0] == 'P' || LiteralName[0] == 'p')) { 9341 for (unsigned I = 1, N = LiteralName.size(); I < N; ++I) { 9342 if (!isdigit(LiteralName[I])) { 9343 IsHexFloat = false; 9344 break; 9345 } 9346 } 9347 } 9348 9349 if (IsHexFloat) 9350 Diag(FnDecl->getLocation(), diag::warn_user_literal_hexfloat) 9351 << LiteralName; 9352 else 9353 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9354 } 9355 9356 return false; 9357} 9358 9359/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9360/// linkage specification, including the language and (if present) 9361/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9362/// the location of the language string literal, which is provided 9363/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9364/// the '{' brace. Otherwise, this linkage specification does not 9365/// have any braces. 9366Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9367 SourceLocation LangLoc, 9368 StringRef Lang, 9369 SourceLocation LBraceLoc) { 9370 LinkageSpecDecl::LanguageIDs Language; 9371 if (Lang == "\"C\"") 9372 Language = LinkageSpecDecl::lang_c; 9373 else if (Lang == "\"C++\"") 9374 Language = LinkageSpecDecl::lang_cxx; 9375 else { 9376 Diag(LangLoc, diag::err_bad_language); 9377 return 0; 9378 } 9379 9380 // FIXME: Add all the various semantics of linkage specifications 9381 9382 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9383 ExternLoc, LangLoc, Language); 9384 CurContext->addDecl(D); 9385 PushDeclContext(S, D); 9386 return D; 9387} 9388 9389/// ActOnFinishLinkageSpecification - Complete the definition of 9390/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9391/// valid, it's the position of the closing '}' brace in a linkage 9392/// specification that uses braces. 9393Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9394 Decl *LinkageSpec, 9395 SourceLocation RBraceLoc) { 9396 if (LinkageSpec) { 9397 if (RBraceLoc.isValid()) { 9398 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9399 LSDecl->setRBraceLoc(RBraceLoc); 9400 } 9401 PopDeclContext(); 9402 } 9403 return LinkageSpec; 9404} 9405 9406/// \brief Perform semantic analysis for the variable declaration that 9407/// occurs within a C++ catch clause, returning the newly-created 9408/// variable. 9409VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9410 TypeSourceInfo *TInfo, 9411 SourceLocation StartLoc, 9412 SourceLocation Loc, 9413 IdentifierInfo *Name) { 9414 bool Invalid = false; 9415 QualType ExDeclType = TInfo->getType(); 9416 9417 // Arrays and functions decay. 9418 if (ExDeclType->isArrayType()) 9419 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9420 else if (ExDeclType->isFunctionType()) 9421 ExDeclType = Context.getPointerType(ExDeclType); 9422 9423 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9424 // The exception-declaration shall not denote a pointer or reference to an 9425 // incomplete type, other than [cv] void*. 9426 // N2844 forbids rvalue references. 9427 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9428 Diag(Loc, diag::err_catch_rvalue_ref); 9429 Invalid = true; 9430 } 9431 9432 QualType BaseType = ExDeclType; 9433 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9434 unsigned DK = diag::err_catch_incomplete; 9435 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9436 BaseType = Ptr->getPointeeType(); 9437 Mode = 1; 9438 DK = diag::err_catch_incomplete_ptr; 9439 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9440 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9441 BaseType = Ref->getPointeeType(); 9442 Mode = 2; 9443 DK = diag::err_catch_incomplete_ref; 9444 } 9445 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9446 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9447 Invalid = true; 9448 9449 if (!Invalid && !ExDeclType->isDependentType() && 9450 RequireNonAbstractType(Loc, ExDeclType, 9451 diag::err_abstract_type_in_decl, 9452 AbstractVariableType)) 9453 Invalid = true; 9454 9455 // Only the non-fragile NeXT runtime currently supports C++ catches 9456 // of ObjC types, and no runtime supports catching ObjC types by value. 9457 if (!Invalid && getLangOptions().ObjC1) { 9458 QualType T = ExDeclType; 9459 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9460 T = RT->getPointeeType(); 9461 9462 if (T->isObjCObjectType()) { 9463 Diag(Loc, diag::err_objc_object_catch); 9464 Invalid = true; 9465 } else if (T->isObjCObjectPointerType()) { 9466 if (!getLangOptions().ObjCNonFragileABI) 9467 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9468 } 9469 } 9470 9471 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9472 ExDeclType, TInfo, SC_None, SC_None); 9473 ExDecl->setExceptionVariable(true); 9474 9475 // In ARC, infer 'retaining' for variables of retainable type. 9476 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9477 Invalid = true; 9478 9479 if (!Invalid && !ExDeclType->isDependentType()) { 9480 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9481 // C++ [except.handle]p16: 9482 // The object declared in an exception-declaration or, if the 9483 // exception-declaration does not specify a name, a temporary (12.2) is 9484 // copy-initialized (8.5) from the exception object. [...] 9485 // The object is destroyed when the handler exits, after the destruction 9486 // of any automatic objects initialized within the handler. 9487 // 9488 // We just pretend to initialize the object with itself, then make sure 9489 // it can be destroyed later. 9490 QualType initType = ExDeclType; 9491 9492 InitializedEntity entity = 9493 InitializedEntity::InitializeVariable(ExDecl); 9494 InitializationKind initKind = 9495 InitializationKind::CreateCopy(Loc, SourceLocation()); 9496 9497 Expr *opaqueValue = 9498 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9499 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9500 ExprResult result = sequence.Perform(*this, entity, initKind, 9501 MultiExprArg(&opaqueValue, 1)); 9502 if (result.isInvalid()) 9503 Invalid = true; 9504 else { 9505 // If the constructor used was non-trivial, set this as the 9506 // "initializer". 9507 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9508 if (!construct->getConstructor()->isTrivial()) { 9509 Expr *init = MaybeCreateExprWithCleanups(construct); 9510 ExDecl->setInit(init); 9511 } 9512 9513 // And make sure it's destructable. 9514 FinalizeVarWithDestructor(ExDecl, recordType); 9515 } 9516 } 9517 } 9518 9519 if (Invalid) 9520 ExDecl->setInvalidDecl(); 9521 9522 return ExDecl; 9523} 9524 9525/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9526/// handler. 9527Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9528 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9529 bool Invalid = D.isInvalidType(); 9530 9531 // Check for unexpanded parameter packs. 9532 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9533 UPPC_ExceptionType)) { 9534 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9535 D.getIdentifierLoc()); 9536 Invalid = true; 9537 } 9538 9539 IdentifierInfo *II = D.getIdentifier(); 9540 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9541 LookupOrdinaryName, 9542 ForRedeclaration)) { 9543 // The scope should be freshly made just for us. There is just no way 9544 // it contains any previous declaration. 9545 assert(!S->isDeclScope(PrevDecl)); 9546 if (PrevDecl->isTemplateParameter()) { 9547 // Maybe we will complain about the shadowed template parameter. 9548 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9549 PrevDecl = 0; 9550 } 9551 } 9552 9553 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9554 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9555 << D.getCXXScopeSpec().getRange(); 9556 Invalid = true; 9557 } 9558 9559 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9560 D.getSourceRange().getBegin(), 9561 D.getIdentifierLoc(), 9562 D.getIdentifier()); 9563 if (Invalid) 9564 ExDecl->setInvalidDecl(); 9565 9566 // Add the exception declaration into this scope. 9567 if (II) 9568 PushOnScopeChains(ExDecl, S); 9569 else 9570 CurContext->addDecl(ExDecl); 9571 9572 ProcessDeclAttributes(S, ExDecl, D); 9573 return ExDecl; 9574} 9575 9576Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9577 Expr *AssertExpr, 9578 Expr *AssertMessageExpr_, 9579 SourceLocation RParenLoc) { 9580 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9581 9582 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9583 // In a static_assert-declaration, the constant-expression shall be a 9584 // constant expression that can be contextually converted to bool. 9585 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9586 if (Converted.isInvalid()) 9587 return 0; 9588 9589 llvm::APSInt Cond; 9590 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9591 PDiag(diag::err_static_assert_expression_is_not_constant), 9592 /*AllowFold=*/false).isInvalid()) 9593 return 0; 9594 9595 if (!Cond) 9596 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9597 << AssertMessage->getString() << AssertExpr->getSourceRange(); 9598 } 9599 9600 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9601 return 0; 9602 9603 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9604 AssertExpr, AssertMessage, RParenLoc); 9605 9606 CurContext->addDecl(Decl); 9607 return Decl; 9608} 9609 9610/// \brief Perform semantic analysis of the given friend type declaration. 9611/// 9612/// \returns A friend declaration that. 9613FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9614 SourceLocation FriendLoc, 9615 TypeSourceInfo *TSInfo) { 9616 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9617 9618 QualType T = TSInfo->getType(); 9619 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9620 9621 // C++03 [class.friend]p2: 9622 // An elaborated-type-specifier shall be used in a friend declaration 9623 // for a class.* 9624 // 9625 // * The class-key of the elaborated-type-specifier is required. 9626 if (!ActiveTemplateInstantiations.empty()) { 9627 // Do not complain about the form of friend template types during 9628 // template instantiation; we will already have complained when the 9629 // template was declared. 9630 } else if (!T->isElaboratedTypeSpecifier()) { 9631 // If we evaluated the type to a record type, suggest putting 9632 // a tag in front. 9633 if (const RecordType *RT = T->getAs<RecordType>()) { 9634 RecordDecl *RD = RT->getDecl(); 9635 9636 std::string InsertionText = std::string(" ") + RD->getKindName(); 9637 9638 Diag(TypeRange.getBegin(), 9639 getLangOptions().CPlusPlus0x ? 9640 diag::warn_cxx98_compat_unelaborated_friend_type : 9641 diag::ext_unelaborated_friend_type) 9642 << (unsigned) RD->getTagKind() 9643 << T 9644 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9645 InsertionText); 9646 } else { 9647 Diag(FriendLoc, 9648 getLangOptions().CPlusPlus0x ? 9649 diag::warn_cxx98_compat_nonclass_type_friend : 9650 diag::ext_nonclass_type_friend) 9651 << T 9652 << SourceRange(FriendLoc, TypeRange.getEnd()); 9653 } 9654 } else if (T->getAs<EnumType>()) { 9655 Diag(FriendLoc, 9656 getLangOptions().CPlusPlus0x ? 9657 diag::warn_cxx98_compat_enum_friend : 9658 diag::ext_enum_friend) 9659 << T 9660 << SourceRange(FriendLoc, TypeRange.getEnd()); 9661 } 9662 9663 // C++0x [class.friend]p3: 9664 // If the type specifier in a friend declaration designates a (possibly 9665 // cv-qualified) class type, that class is declared as a friend; otherwise, 9666 // the friend declaration is ignored. 9667 9668 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9669 // in [class.friend]p3 that we do not implement. 9670 9671 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9672} 9673 9674/// Handle a friend tag declaration where the scope specifier was 9675/// templated. 9676Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9677 unsigned TagSpec, SourceLocation TagLoc, 9678 CXXScopeSpec &SS, 9679 IdentifierInfo *Name, SourceLocation NameLoc, 9680 AttributeList *Attr, 9681 MultiTemplateParamsArg TempParamLists) { 9682 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9683 9684 bool isExplicitSpecialization = false; 9685 bool Invalid = false; 9686 9687 if (TemplateParameterList *TemplateParams 9688 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9689 TempParamLists.get(), 9690 TempParamLists.size(), 9691 /*friend*/ true, 9692 isExplicitSpecialization, 9693 Invalid)) { 9694 if (TemplateParams->size() > 0) { 9695 // This is a declaration of a class template. 9696 if (Invalid) 9697 return 0; 9698 9699 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9700 SS, Name, NameLoc, Attr, 9701 TemplateParams, AS_public, 9702 /*ModulePrivateLoc=*/SourceLocation(), 9703 TempParamLists.size() - 1, 9704 (TemplateParameterList**) TempParamLists.release()).take(); 9705 } else { 9706 // The "template<>" header is extraneous. 9707 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9708 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9709 isExplicitSpecialization = true; 9710 } 9711 } 9712 9713 if (Invalid) return 0; 9714 9715 bool isAllExplicitSpecializations = true; 9716 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9717 if (TempParamLists.get()[I]->size()) { 9718 isAllExplicitSpecializations = false; 9719 break; 9720 } 9721 } 9722 9723 // FIXME: don't ignore attributes. 9724 9725 // If it's explicit specializations all the way down, just forget 9726 // about the template header and build an appropriate non-templated 9727 // friend. TODO: for source fidelity, remember the headers. 9728 if (isAllExplicitSpecializations) { 9729 if (SS.isEmpty()) { 9730 bool Owned = false; 9731 bool IsDependent = false; 9732 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9733 Attr, AS_public, 9734 /*ModulePrivateLoc=*/SourceLocation(), 9735 MultiTemplateParamsArg(), Owned, IsDependent, 9736 /*ScopedEnumKWLoc=*/SourceLocation(), 9737 /*ScopedEnumUsesClassTag=*/false, 9738 /*UnderlyingType=*/TypeResult()); 9739 } 9740 9741 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9742 ElaboratedTypeKeyword Keyword 9743 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9744 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9745 *Name, NameLoc); 9746 if (T.isNull()) 9747 return 0; 9748 9749 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9750 if (isa<DependentNameType>(T)) { 9751 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9752 TL.setElaboratedKeywordLoc(TagLoc); 9753 TL.setQualifierLoc(QualifierLoc); 9754 TL.setNameLoc(NameLoc); 9755 } else { 9756 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9757 TL.setElaboratedKeywordLoc(TagLoc); 9758 TL.setQualifierLoc(QualifierLoc); 9759 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9760 } 9761 9762 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9763 TSI, FriendLoc); 9764 Friend->setAccess(AS_public); 9765 CurContext->addDecl(Friend); 9766 return Friend; 9767 } 9768 9769 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9770 9771 9772 9773 // Handle the case of a templated-scope friend class. e.g. 9774 // template <class T> class A<T>::B; 9775 // FIXME: we don't support these right now. 9776 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9777 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9778 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9779 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9780 TL.setElaboratedKeywordLoc(TagLoc); 9781 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9782 TL.setNameLoc(NameLoc); 9783 9784 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9785 TSI, FriendLoc); 9786 Friend->setAccess(AS_public); 9787 Friend->setUnsupportedFriend(true); 9788 CurContext->addDecl(Friend); 9789 return Friend; 9790} 9791 9792 9793/// Handle a friend type declaration. This works in tandem with 9794/// ActOnTag. 9795/// 9796/// Notes on friend class templates: 9797/// 9798/// We generally treat friend class declarations as if they were 9799/// declaring a class. So, for example, the elaborated type specifier 9800/// in a friend declaration is required to obey the restrictions of a 9801/// class-head (i.e. no typedefs in the scope chain), template 9802/// parameters are required to match up with simple template-ids, &c. 9803/// However, unlike when declaring a template specialization, it's 9804/// okay to refer to a template specialization without an empty 9805/// template parameter declaration, e.g. 9806/// friend class A<T>::B<unsigned>; 9807/// We permit this as a special case; if there are any template 9808/// parameters present at all, require proper matching, i.e. 9809/// template <> template <class T> friend class A<int>::B; 9810Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9811 MultiTemplateParamsArg TempParams) { 9812 SourceLocation Loc = DS.getSourceRange().getBegin(); 9813 9814 assert(DS.isFriendSpecified()); 9815 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9816 9817 // Try to convert the decl specifier to a type. This works for 9818 // friend templates because ActOnTag never produces a ClassTemplateDecl 9819 // for a TUK_Friend. 9820 Declarator TheDeclarator(DS, Declarator::MemberContext); 9821 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9822 QualType T = TSI->getType(); 9823 if (TheDeclarator.isInvalidType()) 9824 return 0; 9825 9826 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9827 return 0; 9828 9829 // This is definitely an error in C++98. It's probably meant to 9830 // be forbidden in C++0x, too, but the specification is just 9831 // poorly written. 9832 // 9833 // The problem is with declarations like the following: 9834 // template <T> friend A<T>::foo; 9835 // where deciding whether a class C is a friend or not now hinges 9836 // on whether there exists an instantiation of A that causes 9837 // 'foo' to equal C. There are restrictions on class-heads 9838 // (which we declare (by fiat) elaborated friend declarations to 9839 // be) that makes this tractable. 9840 // 9841 // FIXME: handle "template <> friend class A<T>;", which 9842 // is possibly well-formed? Who even knows? 9843 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 9844 Diag(Loc, diag::err_tagless_friend_type_template) 9845 << DS.getSourceRange(); 9846 return 0; 9847 } 9848 9849 // C++98 [class.friend]p1: A friend of a class is a function 9850 // or class that is not a member of the class . . . 9851 // This is fixed in DR77, which just barely didn't make the C++03 9852 // deadline. It's also a very silly restriction that seriously 9853 // affects inner classes and which nobody else seems to implement; 9854 // thus we never diagnose it, not even in -pedantic. 9855 // 9856 // But note that we could warn about it: it's always useless to 9857 // friend one of your own members (it's not, however, worthless to 9858 // friend a member of an arbitrary specialization of your template). 9859 9860 Decl *D; 9861 if (unsigned NumTempParamLists = TempParams.size()) 9862 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 9863 NumTempParamLists, 9864 TempParams.release(), 9865 TSI, 9866 DS.getFriendSpecLoc()); 9867 else 9868 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 9869 9870 if (!D) 9871 return 0; 9872 9873 D->setAccess(AS_public); 9874 CurContext->addDecl(D); 9875 9876 return D; 9877} 9878 9879Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 9880 MultiTemplateParamsArg TemplateParams) { 9881 const DeclSpec &DS = D.getDeclSpec(); 9882 9883 assert(DS.isFriendSpecified()); 9884 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9885 9886 SourceLocation Loc = D.getIdentifierLoc(); 9887 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9888 9889 // C++ [class.friend]p1 9890 // A friend of a class is a function or class.... 9891 // Note that this sees through typedefs, which is intended. 9892 // It *doesn't* see through dependent types, which is correct 9893 // according to [temp.arg.type]p3: 9894 // If a declaration acquires a function type through a 9895 // type dependent on a template-parameter and this causes 9896 // a declaration that does not use the syntactic form of a 9897 // function declarator to have a function type, the program 9898 // is ill-formed. 9899 if (!TInfo->getType()->isFunctionType()) { 9900 Diag(Loc, diag::err_unexpected_friend); 9901 9902 // It might be worthwhile to try to recover by creating an 9903 // appropriate declaration. 9904 return 0; 9905 } 9906 9907 // C++ [namespace.memdef]p3 9908 // - If a friend declaration in a non-local class first declares a 9909 // class or function, the friend class or function is a member 9910 // of the innermost enclosing namespace. 9911 // - The name of the friend is not found by simple name lookup 9912 // until a matching declaration is provided in that namespace 9913 // scope (either before or after the class declaration granting 9914 // friendship). 9915 // - If a friend function is called, its name may be found by the 9916 // name lookup that considers functions from namespaces and 9917 // classes associated with the types of the function arguments. 9918 // - When looking for a prior declaration of a class or a function 9919 // declared as a friend, scopes outside the innermost enclosing 9920 // namespace scope are not considered. 9921 9922 CXXScopeSpec &SS = D.getCXXScopeSpec(); 9923 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 9924 DeclarationName Name = NameInfo.getName(); 9925 assert(Name); 9926 9927 // Check for unexpanded parameter packs. 9928 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 9929 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 9930 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 9931 return 0; 9932 9933 // The context we found the declaration in, or in which we should 9934 // create the declaration. 9935 DeclContext *DC; 9936 Scope *DCScope = S; 9937 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 9938 ForRedeclaration); 9939 9940 // FIXME: there are different rules in local classes 9941 9942 // There are four cases here. 9943 // - There's no scope specifier, in which case we just go to the 9944 // appropriate scope and look for a function or function template 9945 // there as appropriate. 9946 // Recover from invalid scope qualifiers as if they just weren't there. 9947 if (SS.isInvalid() || !SS.isSet()) { 9948 // C++0x [namespace.memdef]p3: 9949 // If the name in a friend declaration is neither qualified nor 9950 // a template-id and the declaration is a function or an 9951 // elaborated-type-specifier, the lookup to determine whether 9952 // the entity has been previously declared shall not consider 9953 // any scopes outside the innermost enclosing namespace. 9954 // C++0x [class.friend]p11: 9955 // If a friend declaration appears in a local class and the name 9956 // specified is an unqualified name, a prior declaration is 9957 // looked up without considering scopes that are outside the 9958 // innermost enclosing non-class scope. For a friend function 9959 // declaration, if there is no prior declaration, the program is 9960 // ill-formed. 9961 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 9962 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 9963 9964 // Find the appropriate context according to the above. 9965 DC = CurContext; 9966 while (true) { 9967 // Skip class contexts. If someone can cite chapter and verse 9968 // for this behavior, that would be nice --- it's what GCC and 9969 // EDG do, and it seems like a reasonable intent, but the spec 9970 // really only says that checks for unqualified existing 9971 // declarations should stop at the nearest enclosing namespace, 9972 // not that they should only consider the nearest enclosing 9973 // namespace. 9974 while (DC->isRecord()) 9975 DC = DC->getParent(); 9976 9977 LookupQualifiedName(Previous, DC); 9978 9979 // TODO: decide what we think about using declarations. 9980 if (isLocal || !Previous.empty()) 9981 break; 9982 9983 if (isTemplateId) { 9984 if (isa<TranslationUnitDecl>(DC)) break; 9985 } else { 9986 if (DC->isFileContext()) break; 9987 } 9988 DC = DC->getParent(); 9989 } 9990 9991 // C++ [class.friend]p1: A friend of a class is a function or 9992 // class that is not a member of the class . . . 9993 // C++11 changes this for both friend types and functions. 9994 // Most C++ 98 compilers do seem to give an error here, so 9995 // we do, too. 9996 if (!Previous.empty() && DC->Equals(CurContext)) 9997 Diag(DS.getFriendSpecLoc(), 9998 getLangOptions().CPlusPlus0x ? 9999 diag::warn_cxx98_compat_friend_is_member : 10000 diag::err_friend_is_member); 10001 10002 DCScope = getScopeForDeclContext(S, DC); 10003 10004 // C++ [class.friend]p6: 10005 // A function can be defined in a friend declaration of a class if and 10006 // only if the class is a non-local class (9.8), the function name is 10007 // unqualified, and the function has namespace scope. 10008 if (isLocal && D.isFunctionDefinition()) { 10009 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10010 } 10011 10012 // - There's a non-dependent scope specifier, in which case we 10013 // compute it and do a previous lookup there for a function 10014 // or function template. 10015 } else if (!SS.getScopeRep()->isDependent()) { 10016 DC = computeDeclContext(SS); 10017 if (!DC) return 0; 10018 10019 if (RequireCompleteDeclContext(SS, DC)) return 0; 10020 10021 LookupQualifiedName(Previous, DC); 10022 10023 // Ignore things found implicitly in the wrong scope. 10024 // TODO: better diagnostics for this case. Suggesting the right 10025 // qualified scope would be nice... 10026 LookupResult::Filter F = Previous.makeFilter(); 10027 while (F.hasNext()) { 10028 NamedDecl *D = F.next(); 10029 if (!DC->InEnclosingNamespaceSetOf( 10030 D->getDeclContext()->getRedeclContext())) 10031 F.erase(); 10032 } 10033 F.done(); 10034 10035 if (Previous.empty()) { 10036 D.setInvalidType(); 10037 Diag(Loc, diag::err_qualified_friend_not_found) 10038 << Name << TInfo->getType(); 10039 return 0; 10040 } 10041 10042 // C++ [class.friend]p1: A friend of a class is a function or 10043 // class that is not a member of the class . . . 10044 if (DC->Equals(CurContext)) 10045 Diag(DS.getFriendSpecLoc(), 10046 getLangOptions().CPlusPlus0x ? 10047 diag::warn_cxx98_compat_friend_is_member : 10048 diag::err_friend_is_member); 10049 10050 if (D.isFunctionDefinition()) { 10051 // C++ [class.friend]p6: 10052 // A function can be defined in a friend declaration of a class if and 10053 // only if the class is a non-local class (9.8), the function name is 10054 // unqualified, and the function has namespace scope. 10055 SemaDiagnosticBuilder DB 10056 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10057 10058 DB << SS.getScopeRep(); 10059 if (DC->isFileContext()) 10060 DB << FixItHint::CreateRemoval(SS.getRange()); 10061 SS.clear(); 10062 } 10063 10064 // - There's a scope specifier that does not match any template 10065 // parameter lists, in which case we use some arbitrary context, 10066 // create a method or method template, and wait for instantiation. 10067 // - There's a scope specifier that does match some template 10068 // parameter lists, which we don't handle right now. 10069 } else { 10070 if (D.isFunctionDefinition()) { 10071 // C++ [class.friend]p6: 10072 // A function can be defined in a friend declaration of a class if and 10073 // only if the class is a non-local class (9.8), the function name is 10074 // unqualified, and the function has namespace scope. 10075 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10076 << SS.getScopeRep(); 10077 } 10078 10079 DC = CurContext; 10080 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10081 } 10082 10083 if (!DC->isRecord()) { 10084 // This implies that it has to be an operator or function. 10085 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10086 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10087 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10088 Diag(Loc, diag::err_introducing_special_friend) << 10089 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10090 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10091 return 0; 10092 } 10093 } 10094 10095 // FIXME: This is an egregious hack to cope with cases where the scope stack 10096 // does not contain the declaration context, i.e., in an out-of-line 10097 // definition of a class. 10098 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10099 if (!DCScope) { 10100 FakeDCScope.setEntity(DC); 10101 DCScope = &FakeDCScope; 10102 } 10103 10104 bool AddToScope = true; 10105 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10106 move(TemplateParams), AddToScope); 10107 if (!ND) return 0; 10108 10109 assert(ND->getDeclContext() == DC); 10110 assert(ND->getLexicalDeclContext() == CurContext); 10111 10112 // Add the function declaration to the appropriate lookup tables, 10113 // adjusting the redeclarations list as necessary. We don't 10114 // want to do this yet if the friending class is dependent. 10115 // 10116 // Also update the scope-based lookup if the target context's 10117 // lookup context is in lexical scope. 10118 if (!CurContext->isDependentContext()) { 10119 DC = DC->getRedeclContext(); 10120 DC->makeDeclVisibleInContext(ND, /* Recoverable=*/ false); 10121 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10122 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10123 } 10124 10125 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10126 D.getIdentifierLoc(), ND, 10127 DS.getFriendSpecLoc()); 10128 FrD->setAccess(AS_public); 10129 CurContext->addDecl(FrD); 10130 10131 if (ND->isInvalidDecl()) 10132 FrD->setInvalidDecl(); 10133 else { 10134 FunctionDecl *FD; 10135 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10136 FD = FTD->getTemplatedDecl(); 10137 else 10138 FD = cast<FunctionDecl>(ND); 10139 10140 // Mark templated-scope function declarations as unsupported. 10141 if (FD->getNumTemplateParameterLists()) 10142 FrD->setUnsupportedFriend(true); 10143 } 10144 10145 return ND; 10146} 10147 10148void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10149 AdjustDeclIfTemplate(Dcl); 10150 10151 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10152 if (!Fn) { 10153 Diag(DelLoc, diag::err_deleted_non_function); 10154 return; 10155 } 10156 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10157 Diag(DelLoc, diag::err_deleted_decl_not_first); 10158 Diag(Prev->getLocation(), diag::note_previous_declaration); 10159 // If the declaration wasn't the first, we delete the function anyway for 10160 // recovery. 10161 } 10162 Fn->setDeletedAsWritten(); 10163} 10164 10165void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10166 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10167 10168 if (MD) { 10169 if (MD->getParent()->isDependentType()) { 10170 MD->setDefaulted(); 10171 MD->setExplicitlyDefaulted(); 10172 return; 10173 } 10174 10175 CXXSpecialMember Member = getSpecialMember(MD); 10176 if (Member == CXXInvalid) { 10177 Diag(DefaultLoc, diag::err_default_special_members); 10178 return; 10179 } 10180 10181 MD->setDefaulted(); 10182 MD->setExplicitlyDefaulted(); 10183 10184 // If this definition appears within the record, do the checking when 10185 // the record is complete. 10186 const FunctionDecl *Primary = MD; 10187 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10188 // Find the uninstantiated declaration that actually had the '= default' 10189 // on it. 10190 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10191 10192 if (Primary == Primary->getCanonicalDecl()) 10193 return; 10194 10195 switch (Member) { 10196 case CXXDefaultConstructor: { 10197 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10198 CheckExplicitlyDefaultedDefaultConstructor(CD); 10199 if (!CD->isInvalidDecl()) 10200 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10201 break; 10202 } 10203 10204 case CXXCopyConstructor: { 10205 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10206 CheckExplicitlyDefaultedCopyConstructor(CD); 10207 if (!CD->isInvalidDecl()) 10208 DefineImplicitCopyConstructor(DefaultLoc, CD); 10209 break; 10210 } 10211 10212 case CXXCopyAssignment: { 10213 CheckExplicitlyDefaultedCopyAssignment(MD); 10214 if (!MD->isInvalidDecl()) 10215 DefineImplicitCopyAssignment(DefaultLoc, MD); 10216 break; 10217 } 10218 10219 case CXXDestructor: { 10220 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10221 CheckExplicitlyDefaultedDestructor(DD); 10222 if (!DD->isInvalidDecl()) 10223 DefineImplicitDestructor(DefaultLoc, DD); 10224 break; 10225 } 10226 10227 case CXXMoveConstructor: { 10228 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10229 CheckExplicitlyDefaultedMoveConstructor(CD); 10230 if (!CD->isInvalidDecl()) 10231 DefineImplicitMoveConstructor(DefaultLoc, CD); 10232 break; 10233 } 10234 10235 case CXXMoveAssignment: { 10236 CheckExplicitlyDefaultedMoveAssignment(MD); 10237 if (!MD->isInvalidDecl()) 10238 DefineImplicitMoveAssignment(DefaultLoc, MD); 10239 break; 10240 } 10241 10242 case CXXInvalid: 10243 llvm_unreachable("Invalid special member."); 10244 } 10245 } else { 10246 Diag(DefaultLoc, diag::err_default_special_members); 10247 } 10248} 10249 10250static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10251 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10252 Stmt *SubStmt = *CI; 10253 if (!SubStmt) 10254 continue; 10255 if (isa<ReturnStmt>(SubStmt)) 10256 Self.Diag(SubStmt->getSourceRange().getBegin(), 10257 diag::err_return_in_constructor_handler); 10258 if (!isa<Expr>(SubStmt)) 10259 SearchForReturnInStmt(Self, SubStmt); 10260 } 10261} 10262 10263void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10264 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10265 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10266 SearchForReturnInStmt(*this, Handler); 10267 } 10268} 10269 10270bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10271 const CXXMethodDecl *Old) { 10272 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10273 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10274 10275 if (Context.hasSameType(NewTy, OldTy) || 10276 NewTy->isDependentType() || OldTy->isDependentType()) 10277 return false; 10278 10279 // Check if the return types are covariant 10280 QualType NewClassTy, OldClassTy; 10281 10282 /// Both types must be pointers or references to classes. 10283 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10284 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10285 NewClassTy = NewPT->getPointeeType(); 10286 OldClassTy = OldPT->getPointeeType(); 10287 } 10288 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10289 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10290 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10291 NewClassTy = NewRT->getPointeeType(); 10292 OldClassTy = OldRT->getPointeeType(); 10293 } 10294 } 10295 } 10296 10297 // The return types aren't either both pointers or references to a class type. 10298 if (NewClassTy.isNull()) { 10299 Diag(New->getLocation(), 10300 diag::err_different_return_type_for_overriding_virtual_function) 10301 << New->getDeclName() << NewTy << OldTy; 10302 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10303 10304 return true; 10305 } 10306 10307 // C++ [class.virtual]p6: 10308 // If the return type of D::f differs from the return type of B::f, the 10309 // class type in the return type of D::f shall be complete at the point of 10310 // declaration of D::f or shall be the class type D. 10311 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10312 if (!RT->isBeingDefined() && 10313 RequireCompleteType(New->getLocation(), NewClassTy, 10314 PDiag(diag::err_covariant_return_incomplete) 10315 << New->getDeclName())) 10316 return true; 10317 } 10318 10319 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10320 // Check if the new class derives from the old class. 10321 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10322 Diag(New->getLocation(), 10323 diag::err_covariant_return_not_derived) 10324 << New->getDeclName() << NewTy << OldTy; 10325 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10326 return true; 10327 } 10328 10329 // Check if we the conversion from derived to base is valid. 10330 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10331 diag::err_covariant_return_inaccessible_base, 10332 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10333 // FIXME: Should this point to the return type? 10334 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10335 // FIXME: this note won't trigger for delayed access control 10336 // diagnostics, and it's impossible to get an undelayed error 10337 // here from access control during the original parse because 10338 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10339 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10340 return true; 10341 } 10342 } 10343 10344 // The qualifiers of the return types must be the same. 10345 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10346 Diag(New->getLocation(), 10347 diag::err_covariant_return_type_different_qualifications) 10348 << New->getDeclName() << NewTy << OldTy; 10349 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10350 return true; 10351 }; 10352 10353 10354 // The new class type must have the same or less qualifiers as the old type. 10355 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10356 Diag(New->getLocation(), 10357 diag::err_covariant_return_type_class_type_more_qualified) 10358 << New->getDeclName() << NewTy << OldTy; 10359 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10360 return true; 10361 }; 10362 10363 return false; 10364} 10365 10366/// \brief Mark the given method pure. 10367/// 10368/// \param Method the method to be marked pure. 10369/// 10370/// \param InitRange the source range that covers the "0" initializer. 10371bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10372 SourceLocation EndLoc = InitRange.getEnd(); 10373 if (EndLoc.isValid()) 10374 Method->setRangeEnd(EndLoc); 10375 10376 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10377 Method->setPure(); 10378 return false; 10379 } 10380 10381 if (!Method->isInvalidDecl()) 10382 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10383 << Method->getDeclName() << InitRange; 10384 return true; 10385} 10386 10387/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10388/// an initializer for the out-of-line declaration 'Dcl'. The scope 10389/// is a fresh scope pushed for just this purpose. 10390/// 10391/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10392/// static data member of class X, names should be looked up in the scope of 10393/// class X. 10394void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10395 // If there is no declaration, there was an error parsing it. 10396 if (D == 0 || D->isInvalidDecl()) return; 10397 10398 // We should only get called for declarations with scope specifiers, like: 10399 // int foo::bar; 10400 assert(D->isOutOfLine()); 10401 EnterDeclaratorContext(S, D->getDeclContext()); 10402} 10403 10404/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10405/// initializer for the out-of-line declaration 'D'. 10406void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10407 // If there is no declaration, there was an error parsing it. 10408 if (D == 0 || D->isInvalidDecl()) return; 10409 10410 assert(D->isOutOfLine()); 10411 ExitDeclaratorContext(S); 10412} 10413 10414/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10415/// C++ if/switch/while/for statement. 10416/// e.g: "if (int x = f()) {...}" 10417DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10418 // C++ 6.4p2: 10419 // The declarator shall not specify a function or an array. 10420 // The type-specifier-seq shall not contain typedef and shall not declare a 10421 // new class or enumeration. 10422 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10423 "Parser allowed 'typedef' as storage class of condition decl."); 10424 10425 Decl *Dcl = ActOnDeclarator(S, D); 10426 if (!Dcl) 10427 return true; 10428 10429 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10430 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10431 << D.getSourceRange(); 10432 return true; 10433 } 10434 10435 return Dcl; 10436} 10437 10438void Sema::LoadExternalVTableUses() { 10439 if (!ExternalSource) 10440 return; 10441 10442 SmallVector<ExternalVTableUse, 4> VTables; 10443 ExternalSource->ReadUsedVTables(VTables); 10444 SmallVector<VTableUse, 4> NewUses; 10445 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10446 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10447 = VTablesUsed.find(VTables[I].Record); 10448 // Even if a definition wasn't required before, it may be required now. 10449 if (Pos != VTablesUsed.end()) { 10450 if (!Pos->second && VTables[I].DefinitionRequired) 10451 Pos->second = true; 10452 continue; 10453 } 10454 10455 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10456 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10457 } 10458 10459 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10460} 10461 10462void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10463 bool DefinitionRequired) { 10464 // Ignore any vtable uses in unevaluated operands or for classes that do 10465 // not have a vtable. 10466 if (!Class->isDynamicClass() || Class->isDependentContext() || 10467 CurContext->isDependentContext() || 10468 ExprEvalContexts.back().Context == Unevaluated) 10469 return; 10470 10471 // Try to insert this class into the map. 10472 LoadExternalVTableUses(); 10473 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10474 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10475 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10476 if (!Pos.second) { 10477 // If we already had an entry, check to see if we are promoting this vtable 10478 // to required a definition. If so, we need to reappend to the VTableUses 10479 // list, since we may have already processed the first entry. 10480 if (DefinitionRequired && !Pos.first->second) { 10481 Pos.first->second = true; 10482 } else { 10483 // Otherwise, we can early exit. 10484 return; 10485 } 10486 } 10487 10488 // Local classes need to have their virtual members marked 10489 // immediately. For all other classes, we mark their virtual members 10490 // at the end of the translation unit. 10491 if (Class->isLocalClass()) 10492 MarkVirtualMembersReferenced(Loc, Class); 10493 else 10494 VTableUses.push_back(std::make_pair(Class, Loc)); 10495} 10496 10497bool Sema::DefineUsedVTables() { 10498 LoadExternalVTableUses(); 10499 if (VTableUses.empty()) 10500 return false; 10501 10502 // Note: The VTableUses vector could grow as a result of marking 10503 // the members of a class as "used", so we check the size each 10504 // time through the loop and prefer indices (with are stable) to 10505 // iterators (which are not). 10506 bool DefinedAnything = false; 10507 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10508 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10509 if (!Class) 10510 continue; 10511 10512 SourceLocation Loc = VTableUses[I].second; 10513 10514 // If this class has a key function, but that key function is 10515 // defined in another translation unit, we don't need to emit the 10516 // vtable even though we're using it. 10517 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10518 if (KeyFunction && !KeyFunction->hasBody()) { 10519 switch (KeyFunction->getTemplateSpecializationKind()) { 10520 case TSK_Undeclared: 10521 case TSK_ExplicitSpecialization: 10522 case TSK_ExplicitInstantiationDeclaration: 10523 // The key function is in another translation unit. 10524 continue; 10525 10526 case TSK_ExplicitInstantiationDefinition: 10527 case TSK_ImplicitInstantiation: 10528 // We will be instantiating the key function. 10529 break; 10530 } 10531 } else if (!KeyFunction) { 10532 // If we have a class with no key function that is the subject 10533 // of an explicit instantiation declaration, suppress the 10534 // vtable; it will live with the explicit instantiation 10535 // definition. 10536 bool IsExplicitInstantiationDeclaration 10537 = Class->getTemplateSpecializationKind() 10538 == TSK_ExplicitInstantiationDeclaration; 10539 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10540 REnd = Class->redecls_end(); 10541 R != REnd; ++R) { 10542 TemplateSpecializationKind TSK 10543 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10544 if (TSK == TSK_ExplicitInstantiationDeclaration) 10545 IsExplicitInstantiationDeclaration = true; 10546 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10547 IsExplicitInstantiationDeclaration = false; 10548 break; 10549 } 10550 } 10551 10552 if (IsExplicitInstantiationDeclaration) 10553 continue; 10554 } 10555 10556 // Mark all of the virtual members of this class as referenced, so 10557 // that we can build a vtable. Then, tell the AST consumer that a 10558 // vtable for this class is required. 10559 DefinedAnything = true; 10560 MarkVirtualMembersReferenced(Loc, Class); 10561 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10562 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10563 10564 // Optionally warn if we're emitting a weak vtable. 10565 if (Class->getLinkage() == ExternalLinkage && 10566 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10567 const FunctionDecl *KeyFunctionDef = 0; 10568 if (!KeyFunction || 10569 (KeyFunction->hasBody(KeyFunctionDef) && 10570 KeyFunctionDef->isInlined())) 10571 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10572 TSK_ExplicitInstantiationDefinition 10573 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10574 << Class; 10575 } 10576 } 10577 VTableUses.clear(); 10578 10579 return DefinedAnything; 10580} 10581 10582void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10583 const CXXRecordDecl *RD) { 10584 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10585 e = RD->method_end(); i != e; ++i) { 10586 CXXMethodDecl *MD = *i; 10587 10588 // C++ [basic.def.odr]p2: 10589 // [...] A virtual member function is used if it is not pure. [...] 10590 if (MD->isVirtual() && !MD->isPure()) 10591 MarkFunctionReferenced(Loc, MD); 10592 } 10593 10594 // Only classes that have virtual bases need a VTT. 10595 if (RD->getNumVBases() == 0) 10596 return; 10597 10598 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10599 e = RD->bases_end(); i != e; ++i) { 10600 const CXXRecordDecl *Base = 10601 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10602 if (Base->getNumVBases() == 0) 10603 continue; 10604 MarkVirtualMembersReferenced(Loc, Base); 10605 } 10606} 10607 10608/// SetIvarInitializers - This routine builds initialization ASTs for the 10609/// Objective-C implementation whose ivars need be initialized. 10610void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10611 if (!getLangOptions().CPlusPlus) 10612 return; 10613 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10614 SmallVector<ObjCIvarDecl*, 8> ivars; 10615 CollectIvarsToConstructOrDestruct(OID, ivars); 10616 if (ivars.empty()) 10617 return; 10618 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10619 for (unsigned i = 0; i < ivars.size(); i++) { 10620 FieldDecl *Field = ivars[i]; 10621 if (Field->isInvalidDecl()) 10622 continue; 10623 10624 CXXCtorInitializer *Member; 10625 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10626 InitializationKind InitKind = 10627 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10628 10629 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10630 ExprResult MemberInit = 10631 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10632 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10633 // Note, MemberInit could actually come back empty if no initialization 10634 // is required (e.g., because it would call a trivial default constructor) 10635 if (!MemberInit.get() || MemberInit.isInvalid()) 10636 continue; 10637 10638 Member = 10639 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10640 SourceLocation(), 10641 MemberInit.takeAs<Expr>(), 10642 SourceLocation()); 10643 AllToInit.push_back(Member); 10644 10645 // Be sure that the destructor is accessible and is marked as referenced. 10646 if (const RecordType *RecordTy 10647 = Context.getBaseElementType(Field->getType()) 10648 ->getAs<RecordType>()) { 10649 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10650 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10651 MarkFunctionReferenced(Field->getLocation(), Destructor); 10652 CheckDestructorAccess(Field->getLocation(), Destructor, 10653 PDiag(diag::err_access_dtor_ivar) 10654 << Context.getBaseElementType(Field->getType())); 10655 } 10656 } 10657 } 10658 ObjCImplementation->setIvarInitializers(Context, 10659 AllToInit.data(), AllToInit.size()); 10660 } 10661} 10662 10663static 10664void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10665 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10666 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10667 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10668 Sema &S) { 10669 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10670 CE = Current.end(); 10671 if (Ctor->isInvalidDecl()) 10672 return; 10673 10674 const FunctionDecl *FNTarget = 0; 10675 CXXConstructorDecl *Target; 10676 10677 // We ignore the result here since if we don't have a body, Target will be 10678 // null below. 10679 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10680 Target 10681= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10682 10683 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10684 // Avoid dereferencing a null pointer here. 10685 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10686 10687 if (!Current.insert(Canonical)) 10688 return; 10689 10690 // We know that beyond here, we aren't chaining into a cycle. 10691 if (!Target || !Target->isDelegatingConstructor() || 10692 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10693 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10694 Valid.insert(*CI); 10695 Current.clear(); 10696 // We've hit a cycle. 10697 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10698 Current.count(TCanonical)) { 10699 // If we haven't diagnosed this cycle yet, do so now. 10700 if (!Invalid.count(TCanonical)) { 10701 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10702 diag::warn_delegating_ctor_cycle) 10703 << Ctor; 10704 10705 // Don't add a note for a function delegating directo to itself. 10706 if (TCanonical != Canonical) 10707 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10708 10709 CXXConstructorDecl *C = Target; 10710 while (C->getCanonicalDecl() != Canonical) { 10711 (void)C->getTargetConstructor()->hasBody(FNTarget); 10712 assert(FNTarget && "Ctor cycle through bodiless function"); 10713 10714 C 10715 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10716 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10717 } 10718 } 10719 10720 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10721 Invalid.insert(*CI); 10722 Current.clear(); 10723 } else { 10724 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10725 } 10726} 10727 10728 10729void Sema::CheckDelegatingCtorCycles() { 10730 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10731 10732 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10733 CE = Current.end(); 10734 10735 for (DelegatingCtorDeclsType::iterator 10736 I = DelegatingCtorDecls.begin(ExternalSource), 10737 E = DelegatingCtorDecls.end(); 10738 I != E; ++I) { 10739 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10740 } 10741 10742 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10743 (*CI)->setInvalidDecl(); 10744} 10745 10746/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 10747Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 10748 // Implicitly declared functions (e.g. copy constructors) are 10749 // __host__ __device__ 10750 if (D->isImplicit()) 10751 return CFT_HostDevice; 10752 10753 if (D->hasAttr<CUDAGlobalAttr>()) 10754 return CFT_Global; 10755 10756 if (D->hasAttr<CUDADeviceAttr>()) { 10757 if (D->hasAttr<CUDAHostAttr>()) 10758 return CFT_HostDevice; 10759 else 10760 return CFT_Device; 10761 } 10762 10763 return CFT_Host; 10764} 10765 10766bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 10767 CUDAFunctionTarget CalleeTarget) { 10768 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 10769 // Callable from the device only." 10770 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 10771 return true; 10772 10773 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 10774 // Callable from the host only." 10775 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 10776 // Callable from the host only." 10777 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 10778 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 10779 return true; 10780 10781 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 10782 return true; 10783 10784 return false; 10785} 10786