SemaDeclCXX.cpp revision 260611a32535c851237926bfcf78869b13c07d5b
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/EvaluatedExprVisitor.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/RecordLayout.h" 29#include "clang/AST/RecursiveASTVisitor.h" 30#include "clang/AST/StmtVisitor.h" 31#include "clang/AST/TypeLoc.h" 32#include "clang/AST/TypeOrdering.h" 33#include "clang/Sema/DeclSpec.h" 34#include "clang/Sema/ParsedTemplate.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Lex/Preprocessor.h" 37#include "llvm/ADT/SmallString.h" 38#include "llvm/ADT/STLExtras.h" 39#include <map> 40#include <set> 41 42using namespace clang; 43 44//===----------------------------------------------------------------------===// 45// CheckDefaultArgumentVisitor 46//===----------------------------------------------------------------------===// 47 48namespace { 49 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 50 /// the default argument of a parameter to determine whether it 51 /// contains any ill-formed subexpressions. For example, this will 52 /// diagnose the use of local variables or parameters within the 53 /// default argument expression. 54 class CheckDefaultArgumentVisitor 55 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 56 Expr *DefaultArg; 57 Sema *S; 58 59 public: 60 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 61 : DefaultArg(defarg), S(s) {} 62 63 bool VisitExpr(Expr *Node); 64 bool VisitDeclRefExpr(DeclRefExpr *DRE); 65 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 66 bool VisitLambdaExpr(LambdaExpr *Lambda); 67 }; 68 69 /// VisitExpr - Visit all of the children of this expression. 70 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 71 bool IsInvalid = false; 72 for (Stmt::child_range I = Node->children(); I; ++I) 73 IsInvalid |= Visit(*I); 74 return IsInvalid; 75 } 76 77 /// VisitDeclRefExpr - Visit a reference to a declaration, to 78 /// determine whether this declaration can be used in the default 79 /// argument expression. 80 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 81 NamedDecl *Decl = DRE->getDecl(); 82 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 83 // C++ [dcl.fct.default]p9 84 // Default arguments are evaluated each time the function is 85 // called. The order of evaluation of function arguments is 86 // unspecified. Consequently, parameters of a function shall not 87 // be used in default argument expressions, even if they are not 88 // evaluated. Parameters of a function declared before a default 89 // argument expression are in scope and can hide namespace and 90 // class member names. 91 return S->Diag(DRE->getLocStart(), 92 diag::err_param_default_argument_references_param) 93 << Param->getDeclName() << DefaultArg->getSourceRange(); 94 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 95 // C++ [dcl.fct.default]p7 96 // Local variables shall not be used in default argument 97 // expressions. 98 if (VDecl->isLocalVarDecl()) 99 return S->Diag(DRE->getLocStart(), 100 diag::err_param_default_argument_references_local) 101 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 102 } 103 104 return false; 105 } 106 107 /// VisitCXXThisExpr - Visit a C++ "this" expression. 108 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 109 // C++ [dcl.fct.default]p8: 110 // The keyword this shall not be used in a default argument of a 111 // member function. 112 return S->Diag(ThisE->getLocStart(), 113 diag::err_param_default_argument_references_this) 114 << ThisE->getSourceRange(); 115 } 116 117 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 118 // C++11 [expr.lambda.prim]p13: 119 // A lambda-expression appearing in a default argument shall not 120 // implicitly or explicitly capture any entity. 121 if (Lambda->capture_begin() == Lambda->capture_end()) 122 return false; 123 124 return S->Diag(Lambda->getLocStart(), 125 diag::err_lambda_capture_default_arg); 126 } 127} 128 129void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 130 CXXMethodDecl *Method) { 131 // If we have an MSAny or unknown spec already, don't bother. 132 if (!Method || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 133 return; 134 135 const FunctionProtoType *Proto 136 = Method->getType()->getAs<FunctionProtoType>(); 137 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 138 if (!Proto) 139 return; 140 141 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 142 143 // If this function can throw any exceptions, make a note of that. 144 if (EST == EST_Delayed || EST == EST_MSAny || EST == EST_None) { 145 ClearExceptions(); 146 ComputedEST = EST; 147 return; 148 } 149 150 // FIXME: If the call to this decl is using any of its default arguments, we 151 // need to search them for potentially-throwing calls. 152 153 // If this function has a basic noexcept, it doesn't affect the outcome. 154 if (EST == EST_BasicNoexcept) 155 return; 156 157 // If we have a throw-all spec at this point, ignore the function. 158 if (ComputedEST == EST_None) 159 return; 160 161 // If we're still at noexcept(true) and there's a nothrow() callee, 162 // change to that specification. 163 if (EST == EST_DynamicNone) { 164 if (ComputedEST == EST_BasicNoexcept) 165 ComputedEST = EST_DynamicNone; 166 return; 167 } 168 169 // Check out noexcept specs. 170 if (EST == EST_ComputedNoexcept) { 171 FunctionProtoType::NoexceptResult NR = 172 Proto->getNoexceptSpec(Self->Context); 173 assert(NR != FunctionProtoType::NR_NoNoexcept && 174 "Must have noexcept result for EST_ComputedNoexcept."); 175 assert(NR != FunctionProtoType::NR_Dependent && 176 "Should not generate implicit declarations for dependent cases, " 177 "and don't know how to handle them anyway."); 178 179 // noexcept(false) -> no spec on the new function 180 if (NR == FunctionProtoType::NR_Throw) { 181 ClearExceptions(); 182 ComputedEST = EST_None; 183 } 184 // noexcept(true) won't change anything either. 185 return; 186 } 187 188 assert(EST == EST_Dynamic && "EST case not considered earlier."); 189 assert(ComputedEST != EST_None && 190 "Shouldn't collect exceptions when throw-all is guaranteed."); 191 ComputedEST = EST_Dynamic; 192 // Record the exceptions in this function's exception specification. 193 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 194 EEnd = Proto->exception_end(); 195 E != EEnd; ++E) 196 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 197 Exceptions.push_back(*E); 198} 199 200void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 201 if (!E || ComputedEST == EST_MSAny || ComputedEST == EST_Delayed) 202 return; 203 204 // FIXME: 205 // 206 // C++0x [except.spec]p14: 207 // [An] implicit exception-specification specifies the type-id T if and 208 // only if T is allowed by the exception-specification of a function directly 209 // invoked by f's implicit definition; f shall allow all exceptions if any 210 // function it directly invokes allows all exceptions, and f shall allow no 211 // exceptions if every function it directly invokes allows no exceptions. 212 // 213 // Note in particular that if an implicit exception-specification is generated 214 // for a function containing a throw-expression, that specification can still 215 // be noexcept(true). 216 // 217 // Note also that 'directly invoked' is not defined in the standard, and there 218 // is no indication that we should only consider potentially-evaluated calls. 219 // 220 // Ultimately we should implement the intent of the standard: the exception 221 // specification should be the set of exceptions which can be thrown by the 222 // implicit definition. For now, we assume that any non-nothrow expression can 223 // throw any exception. 224 225 if (Self->canThrow(E)) 226 ComputedEST = EST_None; 227} 228 229bool 230Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 231 SourceLocation EqualLoc) { 232 if (RequireCompleteType(Param->getLocation(), Param->getType(), 233 diag::err_typecheck_decl_incomplete_type)) { 234 Param->setInvalidDecl(); 235 return true; 236 } 237 238 // C++ [dcl.fct.default]p5 239 // A default argument expression is implicitly converted (clause 240 // 4) to the parameter type. The default argument expression has 241 // the same semantic constraints as the initializer expression in 242 // a declaration of a variable of the parameter type, using the 243 // copy-initialization semantics (8.5). 244 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 245 Param); 246 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 247 EqualLoc); 248 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 250 MultiExprArg(*this, &Arg, 1)); 251 if (Result.isInvalid()) 252 return true; 253 Arg = Result.takeAs<Expr>(); 254 255 CheckImplicitConversions(Arg, EqualLoc); 256 Arg = MaybeCreateExprWithCleanups(Arg); 257 258 // Okay: add the default argument to the parameter 259 Param->setDefaultArg(Arg); 260 261 // We have already instantiated this parameter; provide each of the 262 // instantiations with the uninstantiated default argument. 263 UnparsedDefaultArgInstantiationsMap::iterator InstPos 264 = UnparsedDefaultArgInstantiations.find(Param); 265 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 266 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 267 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 268 269 // We're done tracking this parameter's instantiations. 270 UnparsedDefaultArgInstantiations.erase(InstPos); 271 } 272 273 return false; 274} 275 276/// ActOnParamDefaultArgument - Check whether the default argument 277/// provided for a function parameter is well-formed. If so, attach it 278/// to the parameter declaration. 279void 280Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 281 Expr *DefaultArg) { 282 if (!param || !DefaultArg) 283 return; 284 285 ParmVarDecl *Param = cast<ParmVarDecl>(param); 286 UnparsedDefaultArgLocs.erase(Param); 287 288 // Default arguments are only permitted in C++ 289 if (!getLangOpts().CPlusPlus) { 290 Diag(EqualLoc, diag::err_param_default_argument) 291 << DefaultArg->getSourceRange(); 292 Param->setInvalidDecl(); 293 return; 294 } 295 296 // Check for unexpanded parameter packs. 297 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 298 Param->setInvalidDecl(); 299 return; 300 } 301 302 // Check that the default argument is well-formed 303 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 304 if (DefaultArgChecker.Visit(DefaultArg)) { 305 Param->setInvalidDecl(); 306 return; 307 } 308 309 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 310} 311 312/// ActOnParamUnparsedDefaultArgument - We've seen a default 313/// argument for a function parameter, but we can't parse it yet 314/// because we're inside a class definition. Note that this default 315/// argument will be parsed later. 316void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 317 SourceLocation EqualLoc, 318 SourceLocation ArgLoc) { 319 if (!param) 320 return; 321 322 ParmVarDecl *Param = cast<ParmVarDecl>(param); 323 if (Param) 324 Param->setUnparsedDefaultArg(); 325 326 UnparsedDefaultArgLocs[Param] = ArgLoc; 327} 328 329/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 330/// the default argument for the parameter param failed. 331void Sema::ActOnParamDefaultArgumentError(Decl *param) { 332 if (!param) 333 return; 334 335 ParmVarDecl *Param = cast<ParmVarDecl>(param); 336 337 Param->setInvalidDecl(); 338 339 UnparsedDefaultArgLocs.erase(Param); 340} 341 342/// CheckExtraCXXDefaultArguments - Check for any extra default 343/// arguments in the declarator, which is not a function declaration 344/// or definition and therefore is not permitted to have default 345/// arguments. This routine should be invoked for every declarator 346/// that is not a function declaration or definition. 347void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 348 // C++ [dcl.fct.default]p3 349 // A default argument expression shall be specified only in the 350 // parameter-declaration-clause of a function declaration or in a 351 // template-parameter (14.1). It shall not be specified for a 352 // parameter pack. If it is specified in a 353 // parameter-declaration-clause, it shall not occur within a 354 // declarator or abstract-declarator of a parameter-declaration. 355 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 356 DeclaratorChunk &chunk = D.getTypeObject(i); 357 if (chunk.Kind == DeclaratorChunk::Function) { 358 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 359 ParmVarDecl *Param = 360 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 361 if (Param->hasUnparsedDefaultArg()) { 362 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 363 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 364 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 365 delete Toks; 366 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 367 } else if (Param->getDefaultArg()) { 368 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 369 << Param->getDefaultArg()->getSourceRange(); 370 Param->setDefaultArg(0); 371 } 372 } 373 } 374 } 375} 376 377// MergeCXXFunctionDecl - Merge two declarations of the same C++ 378// function, once we already know that they have the same 379// type. Subroutine of MergeFunctionDecl. Returns true if there was an 380// error, false otherwise. 381bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 382 Scope *S) { 383 bool Invalid = false; 384 385 // C++ [dcl.fct.default]p4: 386 // For non-template functions, default arguments can be added in 387 // later declarations of a function in the same 388 // scope. Declarations in different scopes have completely 389 // distinct sets of default arguments. That is, declarations in 390 // inner scopes do not acquire default arguments from 391 // declarations in outer scopes, and vice versa. In a given 392 // function declaration, all parameters subsequent to a 393 // parameter with a default argument shall have default 394 // arguments supplied in this or previous declarations. A 395 // default argument shall not be redefined by a later 396 // declaration (not even to the same value). 397 // 398 // C++ [dcl.fct.default]p6: 399 // Except for member functions of class templates, the default arguments 400 // in a member function definition that appears outside of the class 401 // definition are added to the set of default arguments provided by the 402 // member function declaration in the class definition. 403 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 404 ParmVarDecl *OldParam = Old->getParamDecl(p); 405 ParmVarDecl *NewParam = New->getParamDecl(p); 406 407 bool OldParamHasDfl = OldParam->hasDefaultArg(); 408 bool NewParamHasDfl = NewParam->hasDefaultArg(); 409 410 NamedDecl *ND = Old; 411 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 412 // Ignore default parameters of old decl if they are not in 413 // the same scope. 414 OldParamHasDfl = false; 415 416 if (OldParamHasDfl && NewParamHasDfl) { 417 418 unsigned DiagDefaultParamID = 419 diag::err_param_default_argument_redefinition; 420 421 // MSVC accepts that default parameters be redefined for member functions 422 // of template class. The new default parameter's value is ignored. 423 Invalid = true; 424 if (getLangOpts().MicrosoftExt) { 425 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 426 if (MD && MD->getParent()->getDescribedClassTemplate()) { 427 // Merge the old default argument into the new parameter. 428 NewParam->setHasInheritedDefaultArg(); 429 if (OldParam->hasUninstantiatedDefaultArg()) 430 NewParam->setUninstantiatedDefaultArg( 431 OldParam->getUninstantiatedDefaultArg()); 432 else 433 NewParam->setDefaultArg(OldParam->getInit()); 434 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 435 Invalid = false; 436 } 437 } 438 439 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 440 // hint here. Alternatively, we could walk the type-source information 441 // for NewParam to find the last source location in the type... but it 442 // isn't worth the effort right now. This is the kind of test case that 443 // is hard to get right: 444 // int f(int); 445 // void g(int (*fp)(int) = f); 446 // void g(int (*fp)(int) = &f); 447 Diag(NewParam->getLocation(), DiagDefaultParamID) 448 << NewParam->getDefaultArgRange(); 449 450 // Look for the function declaration where the default argument was 451 // actually written, which may be a declaration prior to Old. 452 for (FunctionDecl *Older = Old->getPreviousDecl(); 453 Older; Older = Older->getPreviousDecl()) { 454 if (!Older->getParamDecl(p)->hasDefaultArg()) 455 break; 456 457 OldParam = Older->getParamDecl(p); 458 } 459 460 Diag(OldParam->getLocation(), diag::note_previous_definition) 461 << OldParam->getDefaultArgRange(); 462 } else if (OldParamHasDfl) { 463 // Merge the old default argument into the new parameter. 464 // It's important to use getInit() here; getDefaultArg() 465 // strips off any top-level ExprWithCleanups. 466 NewParam->setHasInheritedDefaultArg(); 467 if (OldParam->hasUninstantiatedDefaultArg()) 468 NewParam->setUninstantiatedDefaultArg( 469 OldParam->getUninstantiatedDefaultArg()); 470 else 471 NewParam->setDefaultArg(OldParam->getInit()); 472 } else if (NewParamHasDfl) { 473 if (New->getDescribedFunctionTemplate()) { 474 // Paragraph 4, quoted above, only applies to non-template functions. 475 Diag(NewParam->getLocation(), 476 diag::err_param_default_argument_template_redecl) 477 << NewParam->getDefaultArgRange(); 478 Diag(Old->getLocation(), diag::note_template_prev_declaration) 479 << false; 480 } else if (New->getTemplateSpecializationKind() 481 != TSK_ImplicitInstantiation && 482 New->getTemplateSpecializationKind() != TSK_Undeclared) { 483 // C++ [temp.expr.spec]p21: 484 // Default function arguments shall not be specified in a declaration 485 // or a definition for one of the following explicit specializations: 486 // - the explicit specialization of a function template; 487 // - the explicit specialization of a member function template; 488 // - the explicit specialization of a member function of a class 489 // template where the class template specialization to which the 490 // member function specialization belongs is implicitly 491 // instantiated. 492 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 493 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 494 << New->getDeclName() 495 << NewParam->getDefaultArgRange(); 496 } else if (New->getDeclContext()->isDependentContext()) { 497 // C++ [dcl.fct.default]p6 (DR217): 498 // Default arguments for a member function of a class template shall 499 // be specified on the initial declaration of the member function 500 // within the class template. 501 // 502 // Reading the tea leaves a bit in DR217 and its reference to DR205 503 // leads me to the conclusion that one cannot add default function 504 // arguments for an out-of-line definition of a member function of a 505 // dependent type. 506 int WhichKind = 2; 507 if (CXXRecordDecl *Record 508 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 509 if (Record->getDescribedClassTemplate()) 510 WhichKind = 0; 511 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 512 WhichKind = 1; 513 else 514 WhichKind = 2; 515 } 516 517 Diag(NewParam->getLocation(), 518 diag::err_param_default_argument_member_template_redecl) 519 << WhichKind 520 << NewParam->getDefaultArgRange(); 521 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 522 CXXSpecialMember NewSM = getSpecialMember(Ctor), 523 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 524 if (NewSM != OldSM) { 525 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 526 << NewParam->getDefaultArgRange() << NewSM; 527 Diag(Old->getLocation(), diag::note_previous_declaration_special) 528 << OldSM; 529 } 530 } 531 } 532 } 533 534 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 535 // template has a constexpr specifier then all its declarations shall 536 // contain the constexpr specifier. 537 if (New->isConstexpr() != Old->isConstexpr()) { 538 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 539 << New << New->isConstexpr(); 540 Diag(Old->getLocation(), diag::note_previous_declaration); 541 Invalid = true; 542 } 543 544 if (CheckEquivalentExceptionSpec(Old, New)) 545 Invalid = true; 546 547 return Invalid; 548} 549 550/// \brief Merge the exception specifications of two variable declarations. 551/// 552/// This is called when there's a redeclaration of a VarDecl. The function 553/// checks if the redeclaration might have an exception specification and 554/// validates compatibility and merges the specs if necessary. 555void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 556 // Shortcut if exceptions are disabled. 557 if (!getLangOpts().CXXExceptions) 558 return; 559 560 assert(Context.hasSameType(New->getType(), Old->getType()) && 561 "Should only be called if types are otherwise the same."); 562 563 QualType NewType = New->getType(); 564 QualType OldType = Old->getType(); 565 566 // We're only interested in pointers and references to functions, as well 567 // as pointers to member functions. 568 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 569 NewType = R->getPointeeType(); 570 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 571 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 572 NewType = P->getPointeeType(); 573 OldType = OldType->getAs<PointerType>()->getPointeeType(); 574 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 575 NewType = M->getPointeeType(); 576 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 577 } 578 579 if (!NewType->isFunctionProtoType()) 580 return; 581 582 // There's lots of special cases for functions. For function pointers, system 583 // libraries are hopefully not as broken so that we don't need these 584 // workarounds. 585 if (CheckEquivalentExceptionSpec( 586 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 587 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 588 New->setInvalidDecl(); 589 } 590} 591 592/// CheckCXXDefaultArguments - Verify that the default arguments for a 593/// function declaration are well-formed according to C++ 594/// [dcl.fct.default]. 595void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 596 unsigned NumParams = FD->getNumParams(); 597 unsigned p; 598 599 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 600 isa<CXXMethodDecl>(FD) && 601 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 602 603 // Find first parameter with a default argument 604 for (p = 0; p < NumParams; ++p) { 605 ParmVarDecl *Param = FD->getParamDecl(p); 606 if (Param->hasDefaultArg()) { 607 // C++11 [expr.prim.lambda]p5: 608 // [...] Default arguments (8.3.6) shall not be specified in the 609 // parameter-declaration-clause of a lambda-declarator. 610 // 611 // FIXME: Core issue 974 strikes this sentence, we only provide an 612 // extension warning. 613 if (IsLambda) 614 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 615 << Param->getDefaultArgRange(); 616 break; 617 } 618 } 619 620 // C++ [dcl.fct.default]p4: 621 // In a given function declaration, all parameters 622 // subsequent to a parameter with a default argument shall 623 // have default arguments supplied in this or previous 624 // declarations. A default argument shall not be redefined 625 // by a later declaration (not even to the same value). 626 unsigned LastMissingDefaultArg = 0; 627 for (; p < NumParams; ++p) { 628 ParmVarDecl *Param = FD->getParamDecl(p); 629 if (!Param->hasDefaultArg()) { 630 if (Param->isInvalidDecl()) 631 /* We already complained about this parameter. */; 632 else if (Param->getIdentifier()) 633 Diag(Param->getLocation(), 634 diag::err_param_default_argument_missing_name) 635 << Param->getIdentifier(); 636 else 637 Diag(Param->getLocation(), 638 diag::err_param_default_argument_missing); 639 640 LastMissingDefaultArg = p; 641 } 642 } 643 644 if (LastMissingDefaultArg > 0) { 645 // Some default arguments were missing. Clear out all of the 646 // default arguments up to (and including) the last missing 647 // default argument, so that we leave the function parameters 648 // in a semantically valid state. 649 for (p = 0; p <= LastMissingDefaultArg; ++p) { 650 ParmVarDecl *Param = FD->getParamDecl(p); 651 if (Param->hasDefaultArg()) { 652 Param->setDefaultArg(0); 653 } 654 } 655 } 656} 657 658// CheckConstexprParameterTypes - Check whether a function's parameter types 659// are all literal types. If so, return true. If not, produce a suitable 660// diagnostic and return false. 661static bool CheckConstexprParameterTypes(Sema &SemaRef, 662 const FunctionDecl *FD) { 663 unsigned ArgIndex = 0; 664 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 665 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 666 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 667 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 668 SourceLocation ParamLoc = PD->getLocation(); 669 if (!(*i)->isDependentType() && 670 SemaRef.RequireLiteralType(ParamLoc, *i, 671 diag::err_constexpr_non_literal_param, 672 ArgIndex+1, PD->getSourceRange(), 673 isa<CXXConstructorDecl>(FD))) 674 return false; 675 } 676 return true; 677} 678 679// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 680// the requirements of a constexpr function definition or a constexpr 681// constructor definition. If so, return true. If not, produce appropriate 682// diagnostics and return false. 683// 684// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 685bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 686 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 687 if (MD && MD->isInstance()) { 688 // C++11 [dcl.constexpr]p4: 689 // The definition of a constexpr constructor shall satisfy the following 690 // constraints: 691 // - the class shall not have any virtual base classes; 692 const CXXRecordDecl *RD = MD->getParent(); 693 if (RD->getNumVBases()) { 694 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 695 << isa<CXXConstructorDecl>(NewFD) << RD->isStruct() 696 << RD->getNumVBases(); 697 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 698 E = RD->vbases_end(); I != E; ++I) 699 Diag(I->getLocStart(), 700 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 701 return false; 702 } 703 } 704 705 if (!isa<CXXConstructorDecl>(NewFD)) { 706 // C++11 [dcl.constexpr]p3: 707 // The definition of a constexpr function shall satisfy the following 708 // constraints: 709 // - it shall not be virtual; 710 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 711 if (Method && Method->isVirtual()) { 712 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 713 714 // If it's not obvious why this function is virtual, find an overridden 715 // function which uses the 'virtual' keyword. 716 const CXXMethodDecl *WrittenVirtual = Method; 717 while (!WrittenVirtual->isVirtualAsWritten()) 718 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 719 if (WrittenVirtual != Method) 720 Diag(WrittenVirtual->getLocation(), 721 diag::note_overridden_virtual_function); 722 return false; 723 } 724 725 // - its return type shall be a literal type; 726 QualType RT = NewFD->getResultType(); 727 if (!RT->isDependentType() && 728 RequireLiteralType(NewFD->getLocation(), RT, 729 diag::err_constexpr_non_literal_return)) 730 return false; 731 } 732 733 // - each of its parameter types shall be a literal type; 734 if (!CheckConstexprParameterTypes(*this, NewFD)) 735 return false; 736 737 return true; 738} 739 740/// Check the given declaration statement is legal within a constexpr function 741/// body. C++0x [dcl.constexpr]p3,p4. 742/// 743/// \return true if the body is OK, false if we have diagnosed a problem. 744static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 745 DeclStmt *DS) { 746 // C++0x [dcl.constexpr]p3 and p4: 747 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 748 // contain only 749 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 750 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 751 switch ((*DclIt)->getKind()) { 752 case Decl::StaticAssert: 753 case Decl::Using: 754 case Decl::UsingShadow: 755 case Decl::UsingDirective: 756 case Decl::UnresolvedUsingTypename: 757 // - static_assert-declarations 758 // - using-declarations, 759 // - using-directives, 760 continue; 761 762 case Decl::Typedef: 763 case Decl::TypeAlias: { 764 // - typedef declarations and alias-declarations that do not define 765 // classes or enumerations, 766 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 767 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 768 // Don't allow variably-modified types in constexpr functions. 769 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 770 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 771 << TL.getSourceRange() << TL.getType() 772 << isa<CXXConstructorDecl>(Dcl); 773 return false; 774 } 775 continue; 776 } 777 778 case Decl::Enum: 779 case Decl::CXXRecord: 780 // As an extension, we allow the declaration (but not the definition) of 781 // classes and enumerations in all declarations, not just in typedef and 782 // alias declarations. 783 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 784 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 785 << isa<CXXConstructorDecl>(Dcl); 786 return false; 787 } 788 continue; 789 790 case Decl::Var: 791 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 792 << isa<CXXConstructorDecl>(Dcl); 793 return false; 794 795 default: 796 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 797 << isa<CXXConstructorDecl>(Dcl); 798 return false; 799 } 800 } 801 802 return true; 803} 804 805/// Check that the given field is initialized within a constexpr constructor. 806/// 807/// \param Dcl The constexpr constructor being checked. 808/// \param Field The field being checked. This may be a member of an anonymous 809/// struct or union nested within the class being checked. 810/// \param Inits All declarations, including anonymous struct/union members and 811/// indirect members, for which any initialization was provided. 812/// \param Diagnosed Set to true if an error is produced. 813static void CheckConstexprCtorInitializer(Sema &SemaRef, 814 const FunctionDecl *Dcl, 815 FieldDecl *Field, 816 llvm::SmallSet<Decl*, 16> &Inits, 817 bool &Diagnosed) { 818 if (Field->isUnnamedBitfield()) 819 return; 820 821 if (Field->isAnonymousStructOrUnion() && 822 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 823 return; 824 825 if (!Inits.count(Field)) { 826 if (!Diagnosed) { 827 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 828 Diagnosed = true; 829 } 830 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 831 } else if (Field->isAnonymousStructOrUnion()) { 832 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 833 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 834 I != E; ++I) 835 // If an anonymous union contains an anonymous struct of which any member 836 // is initialized, all members must be initialized. 837 if (!RD->isUnion() || Inits.count(*I)) 838 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 839 } 840} 841 842/// Check the body for the given constexpr function declaration only contains 843/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 844/// 845/// \return true if the body is OK, false if we have diagnosed a problem. 846bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 847 if (isa<CXXTryStmt>(Body)) { 848 // C++11 [dcl.constexpr]p3: 849 // The definition of a constexpr function shall satisfy the following 850 // constraints: [...] 851 // - its function-body shall be = delete, = default, or a 852 // compound-statement 853 // 854 // C++11 [dcl.constexpr]p4: 855 // In the definition of a constexpr constructor, [...] 856 // - its function-body shall not be a function-try-block; 857 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 858 << isa<CXXConstructorDecl>(Dcl); 859 return false; 860 } 861 862 // - its function-body shall be [...] a compound-statement that contains only 863 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 864 865 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 866 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 867 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 868 switch ((*BodyIt)->getStmtClass()) { 869 case Stmt::NullStmtClass: 870 // - null statements, 871 continue; 872 873 case Stmt::DeclStmtClass: 874 // - static_assert-declarations 875 // - using-declarations, 876 // - using-directives, 877 // - typedef declarations and alias-declarations that do not define 878 // classes or enumerations, 879 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 880 return false; 881 continue; 882 883 case Stmt::ReturnStmtClass: 884 // - and exactly one return statement; 885 if (isa<CXXConstructorDecl>(Dcl)) 886 break; 887 888 ReturnStmts.push_back((*BodyIt)->getLocStart()); 889 continue; 890 891 default: 892 break; 893 } 894 895 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 896 << isa<CXXConstructorDecl>(Dcl); 897 return false; 898 } 899 900 if (const CXXConstructorDecl *Constructor 901 = dyn_cast<CXXConstructorDecl>(Dcl)) { 902 const CXXRecordDecl *RD = Constructor->getParent(); 903 // DR1359: 904 // - every non-variant non-static data member and base class sub-object 905 // shall be initialized; 906 // - if the class is a non-empty union, or for each non-empty anonymous 907 // union member of a non-union class, exactly one non-static data member 908 // shall be initialized; 909 if (RD->isUnion()) { 910 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 911 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 912 return false; 913 } 914 } else if (!Constructor->isDependentContext() && 915 !Constructor->isDelegatingConstructor()) { 916 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 917 918 // Skip detailed checking if we have enough initializers, and we would 919 // allow at most one initializer per member. 920 bool AnyAnonStructUnionMembers = false; 921 unsigned Fields = 0; 922 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 923 E = RD->field_end(); I != E; ++I, ++Fields) { 924 if (I->isAnonymousStructOrUnion()) { 925 AnyAnonStructUnionMembers = true; 926 break; 927 } 928 } 929 if (AnyAnonStructUnionMembers || 930 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 931 // Check initialization of non-static data members. Base classes are 932 // always initialized so do not need to be checked. Dependent bases 933 // might not have initializers in the member initializer list. 934 llvm::SmallSet<Decl*, 16> Inits; 935 for (CXXConstructorDecl::init_const_iterator 936 I = Constructor->init_begin(), E = Constructor->init_end(); 937 I != E; ++I) { 938 if (FieldDecl *FD = (*I)->getMember()) 939 Inits.insert(FD); 940 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 941 Inits.insert(ID->chain_begin(), ID->chain_end()); 942 } 943 944 bool Diagnosed = false; 945 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 946 E = RD->field_end(); I != E; ++I) 947 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 948 if (Diagnosed) 949 return false; 950 } 951 } 952 } else { 953 if (ReturnStmts.empty()) { 954 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 955 return false; 956 } 957 if (ReturnStmts.size() > 1) { 958 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 959 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 960 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 961 return false; 962 } 963 } 964 965 // C++11 [dcl.constexpr]p5: 966 // if no function argument values exist such that the function invocation 967 // substitution would produce a constant expression, the program is 968 // ill-formed; no diagnostic required. 969 // C++11 [dcl.constexpr]p3: 970 // - every constructor call and implicit conversion used in initializing the 971 // return value shall be one of those allowed in a constant expression. 972 // C++11 [dcl.constexpr]p4: 973 // - every constructor involved in initializing non-static data members and 974 // base class sub-objects shall be a constexpr constructor. 975 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 976 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 977 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 978 << isa<CXXConstructorDecl>(Dcl); 979 for (size_t I = 0, N = Diags.size(); I != N; ++I) 980 Diag(Diags[I].first, Diags[I].second); 981 return false; 982 } 983 984 return true; 985} 986 987/// isCurrentClassName - Determine whether the identifier II is the 988/// name of the class type currently being defined. In the case of 989/// nested classes, this will only return true if II is the name of 990/// the innermost class. 991bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 992 const CXXScopeSpec *SS) { 993 assert(getLangOpts().CPlusPlus && "No class names in C!"); 994 995 CXXRecordDecl *CurDecl; 996 if (SS && SS->isSet() && !SS->isInvalid()) { 997 DeclContext *DC = computeDeclContext(*SS, true); 998 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 999 } else 1000 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1001 1002 if (CurDecl && CurDecl->getIdentifier()) 1003 return &II == CurDecl->getIdentifier(); 1004 else 1005 return false; 1006} 1007 1008/// \brief Check the validity of a C++ base class specifier. 1009/// 1010/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1011/// and returns NULL otherwise. 1012CXXBaseSpecifier * 1013Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1014 SourceRange SpecifierRange, 1015 bool Virtual, AccessSpecifier Access, 1016 TypeSourceInfo *TInfo, 1017 SourceLocation EllipsisLoc) { 1018 QualType BaseType = TInfo->getType(); 1019 1020 // C++ [class.union]p1: 1021 // A union shall not have base classes. 1022 if (Class->isUnion()) { 1023 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1024 << SpecifierRange; 1025 return 0; 1026 } 1027 1028 if (EllipsisLoc.isValid() && 1029 !TInfo->getType()->containsUnexpandedParameterPack()) { 1030 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1031 << TInfo->getTypeLoc().getSourceRange(); 1032 EllipsisLoc = SourceLocation(); 1033 } 1034 1035 if (BaseType->isDependentType()) 1036 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1037 Class->getTagKind() == TTK_Class, 1038 Access, TInfo, EllipsisLoc); 1039 1040 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1041 1042 // Base specifiers must be record types. 1043 if (!BaseType->isRecordType()) { 1044 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1045 return 0; 1046 } 1047 1048 // C++ [class.union]p1: 1049 // A union shall not be used as a base class. 1050 if (BaseType->isUnionType()) { 1051 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1052 return 0; 1053 } 1054 1055 // C++ [class.derived]p2: 1056 // The class-name in a base-specifier shall not be an incompletely 1057 // defined class. 1058 if (RequireCompleteType(BaseLoc, BaseType, 1059 diag::err_incomplete_base_class, SpecifierRange)) { 1060 Class->setInvalidDecl(); 1061 return 0; 1062 } 1063 1064 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1065 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1066 assert(BaseDecl && "Record type has no declaration"); 1067 BaseDecl = BaseDecl->getDefinition(); 1068 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1069 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1070 assert(CXXBaseDecl && "Base type is not a C++ type"); 1071 1072 // C++ [class]p3: 1073 // If a class is marked final and it appears as a base-type-specifier in 1074 // base-clause, the program is ill-formed. 1075 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1076 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1077 << CXXBaseDecl->getDeclName(); 1078 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1079 << CXXBaseDecl->getDeclName(); 1080 return 0; 1081 } 1082 1083 if (BaseDecl->isInvalidDecl()) 1084 Class->setInvalidDecl(); 1085 1086 // Create the base specifier. 1087 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1088 Class->getTagKind() == TTK_Class, 1089 Access, TInfo, EllipsisLoc); 1090} 1091 1092/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1093/// one entry in the base class list of a class specifier, for 1094/// example: 1095/// class foo : public bar, virtual private baz { 1096/// 'public bar' and 'virtual private baz' are each base-specifiers. 1097BaseResult 1098Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1099 bool Virtual, AccessSpecifier Access, 1100 ParsedType basetype, SourceLocation BaseLoc, 1101 SourceLocation EllipsisLoc) { 1102 if (!classdecl) 1103 return true; 1104 1105 AdjustDeclIfTemplate(classdecl); 1106 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1107 if (!Class) 1108 return true; 1109 1110 TypeSourceInfo *TInfo = 0; 1111 GetTypeFromParser(basetype, &TInfo); 1112 1113 if (EllipsisLoc.isInvalid() && 1114 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1115 UPPC_BaseType)) 1116 return true; 1117 1118 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1119 Virtual, Access, TInfo, 1120 EllipsisLoc)) 1121 return BaseSpec; 1122 1123 return true; 1124} 1125 1126/// \brief Performs the actual work of attaching the given base class 1127/// specifiers to a C++ class. 1128bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1129 unsigned NumBases) { 1130 if (NumBases == 0) 1131 return false; 1132 1133 // Used to keep track of which base types we have already seen, so 1134 // that we can properly diagnose redundant direct base types. Note 1135 // that the key is always the unqualified canonical type of the base 1136 // class. 1137 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1138 1139 // Copy non-redundant base specifiers into permanent storage. 1140 unsigned NumGoodBases = 0; 1141 bool Invalid = false; 1142 for (unsigned idx = 0; idx < NumBases; ++idx) { 1143 QualType NewBaseType 1144 = Context.getCanonicalType(Bases[idx]->getType()); 1145 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1146 1147 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1148 if (KnownBase) { 1149 // C++ [class.mi]p3: 1150 // A class shall not be specified as a direct base class of a 1151 // derived class more than once. 1152 Diag(Bases[idx]->getLocStart(), 1153 diag::err_duplicate_base_class) 1154 << KnownBase->getType() 1155 << Bases[idx]->getSourceRange(); 1156 1157 // Delete the duplicate base class specifier; we're going to 1158 // overwrite its pointer later. 1159 Context.Deallocate(Bases[idx]); 1160 1161 Invalid = true; 1162 } else { 1163 // Okay, add this new base class. 1164 KnownBase = Bases[idx]; 1165 Bases[NumGoodBases++] = Bases[idx]; 1166 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) 1167 if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl())) 1168 if (RD->hasAttr<WeakAttr>()) 1169 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1170 } 1171 } 1172 1173 // Attach the remaining base class specifiers to the derived class. 1174 Class->setBases(Bases, NumGoodBases); 1175 1176 // Delete the remaining (good) base class specifiers, since their 1177 // data has been copied into the CXXRecordDecl. 1178 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1179 Context.Deallocate(Bases[idx]); 1180 1181 return Invalid; 1182} 1183 1184/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1185/// class, after checking whether there are any duplicate base 1186/// classes. 1187void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1188 unsigned NumBases) { 1189 if (!ClassDecl || !Bases || !NumBases) 1190 return; 1191 1192 AdjustDeclIfTemplate(ClassDecl); 1193 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1194 (CXXBaseSpecifier**)(Bases), NumBases); 1195} 1196 1197static CXXRecordDecl *GetClassForType(QualType T) { 1198 if (const RecordType *RT = T->getAs<RecordType>()) 1199 return cast<CXXRecordDecl>(RT->getDecl()); 1200 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1201 return ICT->getDecl(); 1202 else 1203 return 0; 1204} 1205 1206/// \brief Determine whether the type \p Derived is a C++ class that is 1207/// derived from the type \p Base. 1208bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1209 if (!getLangOpts().CPlusPlus) 1210 return false; 1211 1212 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1213 if (!DerivedRD) 1214 return false; 1215 1216 CXXRecordDecl *BaseRD = GetClassForType(Base); 1217 if (!BaseRD) 1218 return false; 1219 1220 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1221 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1222} 1223 1224/// \brief Determine whether the type \p Derived is a C++ class that is 1225/// derived from the type \p Base. 1226bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1227 if (!getLangOpts().CPlusPlus) 1228 return false; 1229 1230 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1231 if (!DerivedRD) 1232 return false; 1233 1234 CXXRecordDecl *BaseRD = GetClassForType(Base); 1235 if (!BaseRD) 1236 return false; 1237 1238 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1239} 1240 1241void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1242 CXXCastPath &BasePathArray) { 1243 assert(BasePathArray.empty() && "Base path array must be empty!"); 1244 assert(Paths.isRecordingPaths() && "Must record paths!"); 1245 1246 const CXXBasePath &Path = Paths.front(); 1247 1248 // We first go backward and check if we have a virtual base. 1249 // FIXME: It would be better if CXXBasePath had the base specifier for 1250 // the nearest virtual base. 1251 unsigned Start = 0; 1252 for (unsigned I = Path.size(); I != 0; --I) { 1253 if (Path[I - 1].Base->isVirtual()) { 1254 Start = I - 1; 1255 break; 1256 } 1257 } 1258 1259 // Now add all bases. 1260 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1261 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1262} 1263 1264/// \brief Determine whether the given base path includes a virtual 1265/// base class. 1266bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1267 for (CXXCastPath::const_iterator B = BasePath.begin(), 1268 BEnd = BasePath.end(); 1269 B != BEnd; ++B) 1270 if ((*B)->isVirtual()) 1271 return true; 1272 1273 return false; 1274} 1275 1276/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1277/// conversion (where Derived and Base are class types) is 1278/// well-formed, meaning that the conversion is unambiguous (and 1279/// that all of the base classes are accessible). Returns true 1280/// and emits a diagnostic if the code is ill-formed, returns false 1281/// otherwise. Loc is the location where this routine should point to 1282/// if there is an error, and Range is the source range to highlight 1283/// if there is an error. 1284bool 1285Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1286 unsigned InaccessibleBaseID, 1287 unsigned AmbigiousBaseConvID, 1288 SourceLocation Loc, SourceRange Range, 1289 DeclarationName Name, 1290 CXXCastPath *BasePath) { 1291 // First, determine whether the path from Derived to Base is 1292 // ambiguous. This is slightly more expensive than checking whether 1293 // the Derived to Base conversion exists, because here we need to 1294 // explore multiple paths to determine if there is an ambiguity. 1295 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1296 /*DetectVirtual=*/false); 1297 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1298 assert(DerivationOkay && 1299 "Can only be used with a derived-to-base conversion"); 1300 (void)DerivationOkay; 1301 1302 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1303 if (InaccessibleBaseID) { 1304 // Check that the base class can be accessed. 1305 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1306 InaccessibleBaseID)) { 1307 case AR_inaccessible: 1308 return true; 1309 case AR_accessible: 1310 case AR_dependent: 1311 case AR_delayed: 1312 break; 1313 } 1314 } 1315 1316 // Build a base path if necessary. 1317 if (BasePath) 1318 BuildBasePathArray(Paths, *BasePath); 1319 return false; 1320 } 1321 1322 // We know that the derived-to-base conversion is ambiguous, and 1323 // we're going to produce a diagnostic. Perform the derived-to-base 1324 // search just one more time to compute all of the possible paths so 1325 // that we can print them out. This is more expensive than any of 1326 // the previous derived-to-base checks we've done, but at this point 1327 // performance isn't as much of an issue. 1328 Paths.clear(); 1329 Paths.setRecordingPaths(true); 1330 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1331 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1332 (void)StillOkay; 1333 1334 // Build up a textual representation of the ambiguous paths, e.g., 1335 // D -> B -> A, that will be used to illustrate the ambiguous 1336 // conversions in the diagnostic. We only print one of the paths 1337 // to each base class subobject. 1338 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1339 1340 Diag(Loc, AmbigiousBaseConvID) 1341 << Derived << Base << PathDisplayStr << Range << Name; 1342 return true; 1343} 1344 1345bool 1346Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1347 SourceLocation Loc, SourceRange Range, 1348 CXXCastPath *BasePath, 1349 bool IgnoreAccess) { 1350 return CheckDerivedToBaseConversion(Derived, Base, 1351 IgnoreAccess ? 0 1352 : diag::err_upcast_to_inaccessible_base, 1353 diag::err_ambiguous_derived_to_base_conv, 1354 Loc, Range, DeclarationName(), 1355 BasePath); 1356} 1357 1358 1359/// @brief Builds a string representing ambiguous paths from a 1360/// specific derived class to different subobjects of the same base 1361/// class. 1362/// 1363/// This function builds a string that can be used in error messages 1364/// to show the different paths that one can take through the 1365/// inheritance hierarchy to go from the derived class to different 1366/// subobjects of a base class. The result looks something like this: 1367/// @code 1368/// struct D -> struct B -> struct A 1369/// struct D -> struct C -> struct A 1370/// @endcode 1371std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1372 std::string PathDisplayStr; 1373 std::set<unsigned> DisplayedPaths; 1374 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1375 Path != Paths.end(); ++Path) { 1376 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1377 // We haven't displayed a path to this particular base 1378 // class subobject yet. 1379 PathDisplayStr += "\n "; 1380 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1381 for (CXXBasePath::const_iterator Element = Path->begin(); 1382 Element != Path->end(); ++Element) 1383 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1384 } 1385 } 1386 1387 return PathDisplayStr; 1388} 1389 1390//===----------------------------------------------------------------------===// 1391// C++ class member Handling 1392//===----------------------------------------------------------------------===// 1393 1394/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1395bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1396 SourceLocation ASLoc, 1397 SourceLocation ColonLoc, 1398 AttributeList *Attrs) { 1399 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1400 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1401 ASLoc, ColonLoc); 1402 CurContext->addHiddenDecl(ASDecl); 1403 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1404} 1405 1406/// CheckOverrideControl - Check C++0x override control semantics. 1407void Sema::CheckOverrideControl(const Decl *D) { 1408 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1409 if (!MD || !MD->isVirtual()) 1410 return; 1411 1412 if (MD->isDependentContext()) 1413 return; 1414 1415 // C++0x [class.virtual]p3: 1416 // If a virtual function is marked with the virt-specifier override and does 1417 // not override a member function of a base class, 1418 // the program is ill-formed. 1419 bool HasOverriddenMethods = 1420 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1421 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) { 1422 Diag(MD->getLocation(), 1423 diag::err_function_marked_override_not_overriding) 1424 << MD->getDeclName(); 1425 return; 1426 } 1427} 1428 1429/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1430/// function overrides a virtual member function marked 'final', according to 1431/// C++0x [class.virtual]p3. 1432bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1433 const CXXMethodDecl *Old) { 1434 if (!Old->hasAttr<FinalAttr>()) 1435 return false; 1436 1437 Diag(New->getLocation(), diag::err_final_function_overridden) 1438 << New->getDeclName(); 1439 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1440 return true; 1441} 1442 1443static bool InitializationHasSideEffects(const FieldDecl &FD) { 1444 if (!FD.getType().isNull()) { 1445 if (const CXXRecordDecl *RD = FD.getType()->getAsCXXRecordDecl()) { 1446 return !RD->isCompleteDefinition() || 1447 !RD->hasTrivialDefaultConstructor() || 1448 !RD->hasTrivialDestructor(); 1449 } 1450 } 1451 return false; 1452} 1453 1454/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1455/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1456/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1457/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1458/// present (but parsing it has been deferred). 1459Decl * 1460Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1461 MultiTemplateParamsArg TemplateParameterLists, 1462 Expr *BW, const VirtSpecifiers &VS, 1463 InClassInitStyle InitStyle) { 1464 const DeclSpec &DS = D.getDeclSpec(); 1465 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1466 DeclarationName Name = NameInfo.getName(); 1467 SourceLocation Loc = NameInfo.getLoc(); 1468 1469 // For anonymous bitfields, the location should point to the type. 1470 if (Loc.isInvalid()) 1471 Loc = D.getLocStart(); 1472 1473 Expr *BitWidth = static_cast<Expr*>(BW); 1474 1475 assert(isa<CXXRecordDecl>(CurContext)); 1476 assert(!DS.isFriendSpecified()); 1477 1478 bool isFunc = D.isDeclarationOfFunction(); 1479 1480 // C++ 9.2p6: A member shall not be declared to have automatic storage 1481 // duration (auto, register) or with the extern storage-class-specifier. 1482 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1483 // data members and cannot be applied to names declared const or static, 1484 // and cannot be applied to reference members. 1485 switch (DS.getStorageClassSpec()) { 1486 case DeclSpec::SCS_unspecified: 1487 case DeclSpec::SCS_typedef: 1488 case DeclSpec::SCS_static: 1489 // FALL THROUGH. 1490 break; 1491 case DeclSpec::SCS_mutable: 1492 if (isFunc) { 1493 if (DS.getStorageClassSpecLoc().isValid()) 1494 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1495 else 1496 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1497 1498 // FIXME: It would be nicer if the keyword was ignored only for this 1499 // declarator. Otherwise we could get follow-up errors. 1500 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1501 } 1502 break; 1503 default: 1504 if (DS.getStorageClassSpecLoc().isValid()) 1505 Diag(DS.getStorageClassSpecLoc(), 1506 diag::err_storageclass_invalid_for_member); 1507 else 1508 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1509 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1510 } 1511 1512 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1513 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1514 !isFunc); 1515 1516 Decl *Member; 1517 if (isInstField) { 1518 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1519 1520 // Data members must have identifiers for names. 1521 if (!Name.isIdentifier()) { 1522 Diag(Loc, diag::err_bad_variable_name) 1523 << Name; 1524 return 0; 1525 } 1526 1527 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1528 1529 // Member field could not be with "template" keyword. 1530 // So TemplateParameterLists should be empty in this case. 1531 if (TemplateParameterLists.size()) { 1532 TemplateParameterList* TemplateParams = TemplateParameterLists.get()[0]; 1533 if (TemplateParams->size()) { 1534 // There is no such thing as a member field template. 1535 Diag(D.getIdentifierLoc(), diag::err_template_member) 1536 << II 1537 << SourceRange(TemplateParams->getTemplateLoc(), 1538 TemplateParams->getRAngleLoc()); 1539 } else { 1540 // There is an extraneous 'template<>' for this member. 1541 Diag(TemplateParams->getTemplateLoc(), 1542 diag::err_template_member_noparams) 1543 << II 1544 << SourceRange(TemplateParams->getTemplateLoc(), 1545 TemplateParams->getRAngleLoc()); 1546 } 1547 return 0; 1548 } 1549 1550 if (SS.isSet() && !SS.isInvalid()) { 1551 // The user provided a superfluous scope specifier inside a class 1552 // definition: 1553 // 1554 // class X { 1555 // int X::member; 1556 // }; 1557 if (DeclContext *DC = computeDeclContext(SS, false)) 1558 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1559 else 1560 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1561 << Name << SS.getRange(); 1562 1563 SS.clear(); 1564 } 1565 1566 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1567 InitStyle, AS); 1568 assert(Member && "HandleField never returns null"); 1569 } else { 1570 assert(InitStyle == ICIS_NoInit); 1571 1572 Member = HandleDeclarator(S, D, move(TemplateParameterLists)); 1573 if (!Member) { 1574 return 0; 1575 } 1576 1577 // Non-instance-fields can't have a bitfield. 1578 if (BitWidth) { 1579 if (Member->isInvalidDecl()) { 1580 // don't emit another diagnostic. 1581 } else if (isa<VarDecl>(Member)) { 1582 // C++ 9.6p3: A bit-field shall not be a static member. 1583 // "static member 'A' cannot be a bit-field" 1584 Diag(Loc, diag::err_static_not_bitfield) 1585 << Name << BitWidth->getSourceRange(); 1586 } else if (isa<TypedefDecl>(Member)) { 1587 // "typedef member 'x' cannot be a bit-field" 1588 Diag(Loc, diag::err_typedef_not_bitfield) 1589 << Name << BitWidth->getSourceRange(); 1590 } else { 1591 // A function typedef ("typedef int f(); f a;"). 1592 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1593 Diag(Loc, diag::err_not_integral_type_bitfield) 1594 << Name << cast<ValueDecl>(Member)->getType() 1595 << BitWidth->getSourceRange(); 1596 } 1597 1598 BitWidth = 0; 1599 Member->setInvalidDecl(); 1600 } 1601 1602 Member->setAccess(AS); 1603 1604 // If we have declared a member function template, set the access of the 1605 // templated declaration as well. 1606 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1607 FunTmpl->getTemplatedDecl()->setAccess(AS); 1608 } 1609 1610 if (VS.isOverrideSpecified()) { 1611 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1612 if (!MD || !MD->isVirtual()) { 1613 Diag(Member->getLocStart(), 1614 diag::override_keyword_only_allowed_on_virtual_member_functions) 1615 << "override" << FixItHint::CreateRemoval(VS.getOverrideLoc()); 1616 } else 1617 MD->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1618 } 1619 if (VS.isFinalSpecified()) { 1620 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); 1621 if (!MD || !MD->isVirtual()) { 1622 Diag(Member->getLocStart(), 1623 diag::override_keyword_only_allowed_on_virtual_member_functions) 1624 << "final" << FixItHint::CreateRemoval(VS.getFinalLoc()); 1625 } else 1626 MD->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1627 } 1628 1629 if (VS.getLastLocation().isValid()) { 1630 // Update the end location of a method that has a virt-specifiers. 1631 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1632 MD->setRangeEnd(VS.getLastLocation()); 1633 } 1634 1635 CheckOverrideControl(Member); 1636 1637 assert((Name || isInstField) && "No identifier for non-field ?"); 1638 1639 if (isInstField) { 1640 FieldDecl *FD = cast<FieldDecl>(Member); 1641 FieldCollector->Add(FD); 1642 1643 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1644 FD->getLocation()) 1645 != DiagnosticsEngine::Ignored) { 1646 // Remember all explicit private FieldDecls that have a name, no side 1647 // effects and are not part of a dependent type declaration. 1648 if (!FD->isImplicit() && FD->getDeclName() && 1649 FD->getAccess() == AS_private && 1650 !FD->hasAttr<UnusedAttr>() && 1651 !FD->getParent()->getTypeForDecl()->isDependentType() && 1652 !InitializationHasSideEffects(*FD)) 1653 UnusedPrivateFields.insert(FD); 1654 } 1655 } 1656 1657 return Member; 1658} 1659 1660/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1661/// in-class initializer for a non-static C++ class member, and after 1662/// instantiating an in-class initializer in a class template. Such actions 1663/// are deferred until the class is complete. 1664void 1665Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1666 Expr *InitExpr) { 1667 FieldDecl *FD = cast<FieldDecl>(D); 1668 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1669 "must set init style when field is created"); 1670 1671 if (!InitExpr) { 1672 FD->setInvalidDecl(); 1673 FD->removeInClassInitializer(); 1674 return; 1675 } 1676 1677 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1678 FD->setInvalidDecl(); 1679 FD->removeInClassInitializer(); 1680 return; 1681 } 1682 1683 ExprResult Init = InitExpr; 1684 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1685 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1686 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1687 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1688 } 1689 Expr **Inits = &InitExpr; 1690 unsigned NumInits = 1; 1691 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1692 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1693 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1694 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1695 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1696 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1697 if (Init.isInvalid()) { 1698 FD->setInvalidDecl(); 1699 return; 1700 } 1701 1702 CheckImplicitConversions(Init.get(), InitLoc); 1703 } 1704 1705 // C++0x [class.base.init]p7: 1706 // The initialization of each base and member constitutes a 1707 // full-expression. 1708 Init = MaybeCreateExprWithCleanups(Init); 1709 if (Init.isInvalid()) { 1710 FD->setInvalidDecl(); 1711 return; 1712 } 1713 1714 InitExpr = Init.release(); 1715 1716 FD->setInClassInitializer(InitExpr); 1717} 1718 1719/// \brief Find the direct and/or virtual base specifiers that 1720/// correspond to the given base type, for use in base initialization 1721/// within a constructor. 1722static bool FindBaseInitializer(Sema &SemaRef, 1723 CXXRecordDecl *ClassDecl, 1724 QualType BaseType, 1725 const CXXBaseSpecifier *&DirectBaseSpec, 1726 const CXXBaseSpecifier *&VirtualBaseSpec) { 1727 // First, check for a direct base class. 1728 DirectBaseSpec = 0; 1729 for (CXXRecordDecl::base_class_const_iterator Base 1730 = ClassDecl->bases_begin(); 1731 Base != ClassDecl->bases_end(); ++Base) { 1732 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1733 // We found a direct base of this type. That's what we're 1734 // initializing. 1735 DirectBaseSpec = &*Base; 1736 break; 1737 } 1738 } 1739 1740 // Check for a virtual base class. 1741 // FIXME: We might be able to short-circuit this if we know in advance that 1742 // there are no virtual bases. 1743 VirtualBaseSpec = 0; 1744 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1745 // We haven't found a base yet; search the class hierarchy for a 1746 // virtual base class. 1747 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1748 /*DetectVirtual=*/false); 1749 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1750 BaseType, Paths)) { 1751 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1752 Path != Paths.end(); ++Path) { 1753 if (Path->back().Base->isVirtual()) { 1754 VirtualBaseSpec = Path->back().Base; 1755 break; 1756 } 1757 } 1758 } 1759 } 1760 1761 return DirectBaseSpec || VirtualBaseSpec; 1762} 1763 1764/// \brief Handle a C++ member initializer using braced-init-list syntax. 1765MemInitResult 1766Sema::ActOnMemInitializer(Decl *ConstructorD, 1767 Scope *S, 1768 CXXScopeSpec &SS, 1769 IdentifierInfo *MemberOrBase, 1770 ParsedType TemplateTypeTy, 1771 const DeclSpec &DS, 1772 SourceLocation IdLoc, 1773 Expr *InitList, 1774 SourceLocation EllipsisLoc) { 1775 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1776 DS, IdLoc, InitList, 1777 EllipsisLoc); 1778} 1779 1780/// \brief Handle a C++ member initializer using parentheses syntax. 1781MemInitResult 1782Sema::ActOnMemInitializer(Decl *ConstructorD, 1783 Scope *S, 1784 CXXScopeSpec &SS, 1785 IdentifierInfo *MemberOrBase, 1786 ParsedType TemplateTypeTy, 1787 const DeclSpec &DS, 1788 SourceLocation IdLoc, 1789 SourceLocation LParenLoc, 1790 Expr **Args, unsigned NumArgs, 1791 SourceLocation RParenLoc, 1792 SourceLocation EllipsisLoc) { 1793 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, Args, NumArgs, 1794 RParenLoc); 1795 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 1796 DS, IdLoc, List, EllipsisLoc); 1797} 1798 1799namespace { 1800 1801// Callback to only accept typo corrections that can be a valid C++ member 1802// intializer: either a non-static field member or a base class. 1803class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 1804 public: 1805 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 1806 : ClassDecl(ClassDecl) {} 1807 1808 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1809 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 1810 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 1811 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 1812 else 1813 return isa<TypeDecl>(ND); 1814 } 1815 return false; 1816 } 1817 1818 private: 1819 CXXRecordDecl *ClassDecl; 1820}; 1821 1822} 1823 1824/// \brief Handle a C++ member initializer. 1825MemInitResult 1826Sema::BuildMemInitializer(Decl *ConstructorD, 1827 Scope *S, 1828 CXXScopeSpec &SS, 1829 IdentifierInfo *MemberOrBase, 1830 ParsedType TemplateTypeTy, 1831 const DeclSpec &DS, 1832 SourceLocation IdLoc, 1833 Expr *Init, 1834 SourceLocation EllipsisLoc) { 1835 if (!ConstructorD) 1836 return true; 1837 1838 AdjustDeclIfTemplate(ConstructorD); 1839 1840 CXXConstructorDecl *Constructor 1841 = dyn_cast<CXXConstructorDecl>(ConstructorD); 1842 if (!Constructor) { 1843 // The user wrote a constructor initializer on a function that is 1844 // not a C++ constructor. Ignore the error for now, because we may 1845 // have more member initializers coming; we'll diagnose it just 1846 // once in ActOnMemInitializers. 1847 return true; 1848 } 1849 1850 CXXRecordDecl *ClassDecl = Constructor->getParent(); 1851 1852 // C++ [class.base.init]p2: 1853 // Names in a mem-initializer-id are looked up in the scope of the 1854 // constructor's class and, if not found in that scope, are looked 1855 // up in the scope containing the constructor's definition. 1856 // [Note: if the constructor's class contains a member with the 1857 // same name as a direct or virtual base class of the class, a 1858 // mem-initializer-id naming the member or base class and composed 1859 // of a single identifier refers to the class member. A 1860 // mem-initializer-id for the hidden base class may be specified 1861 // using a qualified name. ] 1862 if (!SS.getScopeRep() && !TemplateTypeTy) { 1863 // Look for a member, first. 1864 DeclContext::lookup_result Result 1865 = ClassDecl->lookup(MemberOrBase); 1866 if (Result.first != Result.second) { 1867 ValueDecl *Member; 1868 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 1869 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 1870 if (EllipsisLoc.isValid()) 1871 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 1872 << MemberOrBase 1873 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 1874 1875 return BuildMemberInitializer(Member, Init, IdLoc); 1876 } 1877 } 1878 } 1879 // It didn't name a member, so see if it names a class. 1880 QualType BaseType; 1881 TypeSourceInfo *TInfo = 0; 1882 1883 if (TemplateTypeTy) { 1884 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 1885 } else if (DS.getTypeSpecType() == TST_decltype) { 1886 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 1887 } else { 1888 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 1889 LookupParsedName(R, S, &SS); 1890 1891 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 1892 if (!TyD) { 1893 if (R.isAmbiguous()) return true; 1894 1895 // We don't want access-control diagnostics here. 1896 R.suppressDiagnostics(); 1897 1898 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 1899 bool NotUnknownSpecialization = false; 1900 DeclContext *DC = computeDeclContext(SS, false); 1901 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 1902 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 1903 1904 if (!NotUnknownSpecialization) { 1905 // When the scope specifier can refer to a member of an unknown 1906 // specialization, we take it as a type name. 1907 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 1908 SS.getWithLocInContext(Context), 1909 *MemberOrBase, IdLoc); 1910 if (BaseType.isNull()) 1911 return true; 1912 1913 R.clear(); 1914 R.setLookupName(MemberOrBase); 1915 } 1916 } 1917 1918 // If no results were found, try to correct typos. 1919 TypoCorrection Corr; 1920 MemInitializerValidatorCCC Validator(ClassDecl); 1921 if (R.empty() && BaseType.isNull() && 1922 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 1923 Validator, ClassDecl))) { 1924 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 1925 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 1926 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 1927 // We have found a non-static data member with a similar 1928 // name to what was typed; complain and initialize that 1929 // member. 1930 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1931 << MemberOrBase << true << CorrectedQuotedStr 1932 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1933 Diag(Member->getLocation(), diag::note_previous_decl) 1934 << CorrectedQuotedStr; 1935 1936 return BuildMemberInitializer(Member, Init, IdLoc); 1937 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 1938 const CXXBaseSpecifier *DirectBaseSpec; 1939 const CXXBaseSpecifier *VirtualBaseSpec; 1940 if (FindBaseInitializer(*this, ClassDecl, 1941 Context.getTypeDeclType(Type), 1942 DirectBaseSpec, VirtualBaseSpec)) { 1943 // We have found a direct or virtual base class with a 1944 // similar name to what was typed; complain and initialize 1945 // that base class. 1946 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 1947 << MemberOrBase << false << CorrectedQuotedStr 1948 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 1949 1950 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 1951 : VirtualBaseSpec; 1952 Diag(BaseSpec->getLocStart(), 1953 diag::note_base_class_specified_here) 1954 << BaseSpec->getType() 1955 << BaseSpec->getSourceRange(); 1956 1957 TyD = Type; 1958 } 1959 } 1960 } 1961 1962 if (!TyD && BaseType.isNull()) { 1963 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 1964 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 1965 return true; 1966 } 1967 } 1968 1969 if (BaseType.isNull()) { 1970 BaseType = Context.getTypeDeclType(TyD); 1971 if (SS.isSet()) { 1972 NestedNameSpecifier *Qualifier = 1973 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1974 1975 // FIXME: preserve source range information 1976 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 1977 } 1978 } 1979 } 1980 1981 if (!TInfo) 1982 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 1983 1984 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 1985} 1986 1987/// Checks a member initializer expression for cases where reference (or 1988/// pointer) members are bound to by-value parameters (or their addresses). 1989static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 1990 Expr *Init, 1991 SourceLocation IdLoc) { 1992 QualType MemberTy = Member->getType(); 1993 1994 // We only handle pointers and references currently. 1995 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 1996 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 1997 return; 1998 1999 const bool IsPointer = MemberTy->isPointerType(); 2000 if (IsPointer) { 2001 if (const UnaryOperator *Op 2002 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2003 // The only case we're worried about with pointers requires taking the 2004 // address. 2005 if (Op->getOpcode() != UO_AddrOf) 2006 return; 2007 2008 Init = Op->getSubExpr(); 2009 } else { 2010 // We only handle address-of expression initializers for pointers. 2011 return; 2012 } 2013 } 2014 2015 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2016 // Taking the address of a temporary will be diagnosed as a hard error. 2017 if (IsPointer) 2018 return; 2019 2020 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2021 << Member << Init->getSourceRange(); 2022 } else if (const DeclRefExpr *DRE 2023 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2024 // We only warn when referring to a non-reference parameter declaration. 2025 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2026 if (!Parameter || Parameter->getType()->isReferenceType()) 2027 return; 2028 2029 S.Diag(Init->getExprLoc(), 2030 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2031 : diag::warn_bind_ref_member_to_parameter) 2032 << Member << Parameter << Init->getSourceRange(); 2033 } else { 2034 // Other initializers are fine. 2035 return; 2036 } 2037 2038 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2039 << (unsigned)IsPointer; 2040} 2041 2042namespace { 2043 class UninitializedFieldVisitor 2044 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2045 Sema &S; 2046 ValueDecl *VD; 2047 public: 2048 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2049 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2050 S(S), VD(VD) { 2051 } 2052 2053 void HandleExpr(Expr *E) { 2054 if (!E) return; 2055 2056 // Expressions like x(x) sometimes lack the surrounding expressions 2057 // but need to be checked anyways. 2058 HandleValue(E); 2059 Visit(E); 2060 } 2061 2062 void HandleValue(Expr *E) { 2063 E = E->IgnoreParens(); 2064 2065 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2066 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2067 return; 2068 Expr *Base = E; 2069 while (isa<MemberExpr>(Base)) { 2070 ME = dyn_cast<MemberExpr>(Base); 2071 if (VarDecl *VarD = dyn_cast<VarDecl>(ME->getMemberDecl())) 2072 if (VarD->hasGlobalStorage()) 2073 return; 2074 Base = ME->getBase(); 2075 } 2076 2077 if (VD == ME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2078 S.Diag(ME->getExprLoc(), diag::warn_field_is_uninit); 2079 return; 2080 } 2081 } 2082 2083 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2084 HandleValue(CO->getTrueExpr()); 2085 HandleValue(CO->getFalseExpr()); 2086 return; 2087 } 2088 2089 if (BinaryConditionalOperator *BCO = 2090 dyn_cast<BinaryConditionalOperator>(E)) { 2091 HandleValue(BCO->getCommon()); 2092 HandleValue(BCO->getFalseExpr()); 2093 return; 2094 } 2095 2096 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2097 switch (BO->getOpcode()) { 2098 default: 2099 return; 2100 case(BO_PtrMemD): 2101 case(BO_PtrMemI): 2102 HandleValue(BO->getLHS()); 2103 return; 2104 case(BO_Comma): 2105 HandleValue(BO->getRHS()); 2106 return; 2107 } 2108 } 2109 } 2110 2111 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2112 if (E->getCastKind() == CK_LValueToRValue) 2113 HandleValue(E->getSubExpr()); 2114 2115 Inherited::VisitImplicitCastExpr(E); 2116 } 2117 2118 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2119 Expr *Callee = E->getCallee(); 2120 if (isa<MemberExpr>(Callee)) 2121 HandleValue(Callee); 2122 2123 Inherited::VisitCXXMemberCallExpr(E); 2124 } 2125 }; 2126 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2127 ValueDecl *VD) { 2128 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2129 } 2130} // namespace 2131 2132MemInitResult 2133Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2134 SourceLocation IdLoc) { 2135 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2136 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2137 assert((DirectMember || IndirectMember) && 2138 "Member must be a FieldDecl or IndirectFieldDecl"); 2139 2140 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2141 return true; 2142 2143 if (Member->isInvalidDecl()) 2144 return true; 2145 2146 // Diagnose value-uses of fields to initialize themselves, e.g. 2147 // foo(foo) 2148 // where foo is not also a parameter to the constructor. 2149 // TODO: implement -Wuninitialized and fold this into that framework. 2150 Expr **Args; 2151 unsigned NumArgs; 2152 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2153 Args = ParenList->getExprs(); 2154 NumArgs = ParenList->getNumExprs(); 2155 } else { 2156 InitListExpr *InitList = cast<InitListExpr>(Init); 2157 Args = InitList->getInits(); 2158 NumArgs = InitList->getNumInits(); 2159 } 2160 2161 // Mark FieldDecl as being used if it is a non-primitive type and the 2162 // initializer does not call the default constructor (which is trivial 2163 // for all entries in UnusedPrivateFields). 2164 // FIXME: Make this smarter once more side effect-free types can be 2165 // determined. 2166 if (NumArgs > 0) { 2167 if (Member->getType()->isRecordType()) { 2168 UnusedPrivateFields.remove(Member); 2169 } else { 2170 for (unsigned i = 0; i < NumArgs; ++i) { 2171 if (Args[i]->HasSideEffects(Context)) { 2172 UnusedPrivateFields.remove(Member); 2173 break; 2174 } 2175 } 2176 } 2177 } 2178 2179 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2180 != DiagnosticsEngine::Ignored) 2181 for (unsigned i = 0; i < NumArgs; ++i) 2182 // FIXME: Warn about the case when other fields are used before being 2183 // uninitialized. For example, let this field be the i'th field. When 2184 // initializing the i'th field, throw a warning if any of the >= i'th 2185 // fields are used, as they are not yet initialized. 2186 // Right now we are only handling the case where the i'th field uses 2187 // itself in its initializer. 2188 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2189 2190 SourceRange InitRange = Init->getSourceRange(); 2191 2192 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2193 // Can't check initialization for a member of dependent type or when 2194 // any of the arguments are type-dependent expressions. 2195 DiscardCleanupsInEvaluationContext(); 2196 } else { 2197 bool InitList = false; 2198 if (isa<InitListExpr>(Init)) { 2199 InitList = true; 2200 Args = &Init; 2201 NumArgs = 1; 2202 2203 if (isStdInitializerList(Member->getType(), 0)) { 2204 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2205 << /*at end of ctor*/1 << InitRange; 2206 } 2207 } 2208 2209 // Initialize the member. 2210 InitializedEntity MemberEntity = 2211 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2212 : InitializedEntity::InitializeMember(IndirectMember, 0); 2213 InitializationKind Kind = 2214 InitList ? InitializationKind::CreateDirectList(IdLoc) 2215 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2216 InitRange.getEnd()); 2217 2218 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2219 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2220 MultiExprArg(*this, Args, NumArgs), 2221 0); 2222 if (MemberInit.isInvalid()) 2223 return true; 2224 2225 CheckImplicitConversions(MemberInit.get(), 2226 InitRange.getBegin()); 2227 2228 // C++0x [class.base.init]p7: 2229 // The initialization of each base and member constitutes a 2230 // full-expression. 2231 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2232 if (MemberInit.isInvalid()) 2233 return true; 2234 2235 // If we are in a dependent context, template instantiation will 2236 // perform this type-checking again. Just save the arguments that we 2237 // received. 2238 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2239 // of the information that we have about the member 2240 // initializer. However, deconstructing the ASTs is a dicey process, 2241 // and this approach is far more likely to get the corner cases right. 2242 if (CurContext->isDependentContext()) { 2243 // The existing Init will do fine. 2244 } else { 2245 Init = MemberInit.get(); 2246 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2247 } 2248 } 2249 2250 if (DirectMember) { 2251 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2252 InitRange.getBegin(), Init, 2253 InitRange.getEnd()); 2254 } else { 2255 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2256 InitRange.getBegin(), Init, 2257 InitRange.getEnd()); 2258 } 2259} 2260 2261MemInitResult 2262Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2263 CXXRecordDecl *ClassDecl) { 2264 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2265 if (!LangOpts.CPlusPlus0x) 2266 return Diag(NameLoc, diag::err_delegating_ctor) 2267 << TInfo->getTypeLoc().getLocalSourceRange(); 2268 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2269 2270 bool InitList = true; 2271 Expr **Args = &Init; 2272 unsigned NumArgs = 1; 2273 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2274 InitList = false; 2275 Args = ParenList->getExprs(); 2276 NumArgs = ParenList->getNumExprs(); 2277 } 2278 2279 SourceRange InitRange = Init->getSourceRange(); 2280 // Initialize the object. 2281 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2282 QualType(ClassDecl->getTypeForDecl(), 0)); 2283 InitializationKind Kind = 2284 InitList ? InitializationKind::CreateDirectList(NameLoc) 2285 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2286 InitRange.getEnd()); 2287 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2288 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2289 MultiExprArg(*this, Args,NumArgs), 2290 0); 2291 if (DelegationInit.isInvalid()) 2292 return true; 2293 2294 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2295 "Delegating constructor with no target?"); 2296 2297 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2298 2299 // C++0x [class.base.init]p7: 2300 // The initialization of each base and member constitutes a 2301 // full-expression. 2302 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2303 if (DelegationInit.isInvalid()) 2304 return true; 2305 2306 // If we are in a dependent context, template instantiation will 2307 // perform this type-checking again. Just save the arguments that we 2308 // received in a ParenListExpr. 2309 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2310 // of the information that we have about the base 2311 // initializer. However, deconstructing the ASTs is a dicey process, 2312 // and this approach is far more likely to get the corner cases right. 2313 if (CurContext->isDependentContext()) 2314 DelegationInit = Owned(Init); 2315 2316 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2317 DelegationInit.takeAs<Expr>(), 2318 InitRange.getEnd()); 2319} 2320 2321MemInitResult 2322Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2323 Expr *Init, CXXRecordDecl *ClassDecl, 2324 SourceLocation EllipsisLoc) { 2325 SourceLocation BaseLoc 2326 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2327 2328 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2329 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2330 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2331 2332 // C++ [class.base.init]p2: 2333 // [...] Unless the mem-initializer-id names a nonstatic data 2334 // member of the constructor's class or a direct or virtual base 2335 // of that class, the mem-initializer is ill-formed. A 2336 // mem-initializer-list can initialize a base class using any 2337 // name that denotes that base class type. 2338 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2339 2340 SourceRange InitRange = Init->getSourceRange(); 2341 if (EllipsisLoc.isValid()) { 2342 // This is a pack expansion. 2343 if (!BaseType->containsUnexpandedParameterPack()) { 2344 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2345 << SourceRange(BaseLoc, InitRange.getEnd()); 2346 2347 EllipsisLoc = SourceLocation(); 2348 } 2349 } else { 2350 // Check for any unexpanded parameter packs. 2351 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2352 return true; 2353 2354 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2355 return true; 2356 } 2357 2358 // Check for direct and virtual base classes. 2359 const CXXBaseSpecifier *DirectBaseSpec = 0; 2360 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2361 if (!Dependent) { 2362 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2363 BaseType)) 2364 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2365 2366 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2367 VirtualBaseSpec); 2368 2369 // C++ [base.class.init]p2: 2370 // Unless the mem-initializer-id names a nonstatic data member of the 2371 // constructor's class or a direct or virtual base of that class, the 2372 // mem-initializer is ill-formed. 2373 if (!DirectBaseSpec && !VirtualBaseSpec) { 2374 // If the class has any dependent bases, then it's possible that 2375 // one of those types will resolve to the same type as 2376 // BaseType. Therefore, just treat this as a dependent base 2377 // class initialization. FIXME: Should we try to check the 2378 // initialization anyway? It seems odd. 2379 if (ClassDecl->hasAnyDependentBases()) 2380 Dependent = true; 2381 else 2382 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2383 << BaseType << Context.getTypeDeclType(ClassDecl) 2384 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2385 } 2386 } 2387 2388 if (Dependent) { 2389 DiscardCleanupsInEvaluationContext(); 2390 2391 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2392 /*IsVirtual=*/false, 2393 InitRange.getBegin(), Init, 2394 InitRange.getEnd(), EllipsisLoc); 2395 } 2396 2397 // C++ [base.class.init]p2: 2398 // If a mem-initializer-id is ambiguous because it designates both 2399 // a direct non-virtual base class and an inherited virtual base 2400 // class, the mem-initializer is ill-formed. 2401 if (DirectBaseSpec && VirtualBaseSpec) 2402 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2403 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2404 2405 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2406 if (!BaseSpec) 2407 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2408 2409 // Initialize the base. 2410 bool InitList = true; 2411 Expr **Args = &Init; 2412 unsigned NumArgs = 1; 2413 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2414 InitList = false; 2415 Args = ParenList->getExprs(); 2416 NumArgs = ParenList->getNumExprs(); 2417 } 2418 2419 InitializedEntity BaseEntity = 2420 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2421 InitializationKind Kind = 2422 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2423 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2424 InitRange.getEnd()); 2425 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2426 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2427 MultiExprArg(*this, Args, NumArgs), 2428 0); 2429 if (BaseInit.isInvalid()) 2430 return true; 2431 2432 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2433 2434 // C++0x [class.base.init]p7: 2435 // The initialization of each base and member constitutes a 2436 // full-expression. 2437 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2438 if (BaseInit.isInvalid()) 2439 return true; 2440 2441 // If we are in a dependent context, template instantiation will 2442 // perform this type-checking again. Just save the arguments that we 2443 // received in a ParenListExpr. 2444 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2445 // of the information that we have about the base 2446 // initializer. However, deconstructing the ASTs is a dicey process, 2447 // and this approach is far more likely to get the corner cases right. 2448 if (CurContext->isDependentContext()) 2449 BaseInit = Owned(Init); 2450 2451 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2452 BaseSpec->isVirtual(), 2453 InitRange.getBegin(), 2454 BaseInit.takeAs<Expr>(), 2455 InitRange.getEnd(), EllipsisLoc); 2456} 2457 2458// Create a static_cast\<T&&>(expr). 2459static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2460 QualType ExprType = E->getType(); 2461 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2462 SourceLocation ExprLoc = E->getLocStart(); 2463 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2464 TargetType, ExprLoc); 2465 2466 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2467 SourceRange(ExprLoc, ExprLoc), 2468 E->getSourceRange()).take(); 2469} 2470 2471/// ImplicitInitializerKind - How an implicit base or member initializer should 2472/// initialize its base or member. 2473enum ImplicitInitializerKind { 2474 IIK_Default, 2475 IIK_Copy, 2476 IIK_Move 2477}; 2478 2479static bool 2480BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2481 ImplicitInitializerKind ImplicitInitKind, 2482 CXXBaseSpecifier *BaseSpec, 2483 bool IsInheritedVirtualBase, 2484 CXXCtorInitializer *&CXXBaseInit) { 2485 InitializedEntity InitEntity 2486 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2487 IsInheritedVirtualBase); 2488 2489 ExprResult BaseInit; 2490 2491 switch (ImplicitInitKind) { 2492 case IIK_Default: { 2493 InitializationKind InitKind 2494 = InitializationKind::CreateDefault(Constructor->getLocation()); 2495 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2496 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2497 MultiExprArg(SemaRef, 0, 0)); 2498 break; 2499 } 2500 2501 case IIK_Move: 2502 case IIK_Copy: { 2503 bool Moving = ImplicitInitKind == IIK_Move; 2504 ParmVarDecl *Param = Constructor->getParamDecl(0); 2505 QualType ParamType = Param->getType().getNonReferenceType(); 2506 2507 Expr *CopyCtorArg = 2508 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2509 SourceLocation(), Param, false, 2510 Constructor->getLocation(), ParamType, 2511 VK_LValue, 0); 2512 2513 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2514 2515 // Cast to the base class to avoid ambiguities. 2516 QualType ArgTy = 2517 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2518 ParamType.getQualifiers()); 2519 2520 if (Moving) { 2521 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2522 } 2523 2524 CXXCastPath BasePath; 2525 BasePath.push_back(BaseSpec); 2526 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2527 CK_UncheckedDerivedToBase, 2528 Moving ? VK_XValue : VK_LValue, 2529 &BasePath).take(); 2530 2531 InitializationKind InitKind 2532 = InitializationKind::CreateDirect(Constructor->getLocation(), 2533 SourceLocation(), SourceLocation()); 2534 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2535 &CopyCtorArg, 1); 2536 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2537 MultiExprArg(&CopyCtorArg, 1)); 2538 break; 2539 } 2540 } 2541 2542 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2543 if (BaseInit.isInvalid()) 2544 return true; 2545 2546 CXXBaseInit = 2547 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2548 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2549 SourceLocation()), 2550 BaseSpec->isVirtual(), 2551 SourceLocation(), 2552 BaseInit.takeAs<Expr>(), 2553 SourceLocation(), 2554 SourceLocation()); 2555 2556 return false; 2557} 2558 2559static bool RefersToRValueRef(Expr *MemRef) { 2560 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2561 return Referenced->getType()->isRValueReferenceType(); 2562} 2563 2564static bool 2565BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2566 ImplicitInitializerKind ImplicitInitKind, 2567 FieldDecl *Field, IndirectFieldDecl *Indirect, 2568 CXXCtorInitializer *&CXXMemberInit) { 2569 if (Field->isInvalidDecl()) 2570 return true; 2571 2572 SourceLocation Loc = Constructor->getLocation(); 2573 2574 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2575 bool Moving = ImplicitInitKind == IIK_Move; 2576 ParmVarDecl *Param = Constructor->getParamDecl(0); 2577 QualType ParamType = Param->getType().getNonReferenceType(); 2578 2579 // Suppress copying zero-width bitfields. 2580 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2581 return false; 2582 2583 Expr *MemberExprBase = 2584 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2585 SourceLocation(), Param, false, 2586 Loc, ParamType, VK_LValue, 0); 2587 2588 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2589 2590 if (Moving) { 2591 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2592 } 2593 2594 // Build a reference to this field within the parameter. 2595 CXXScopeSpec SS; 2596 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2597 Sema::LookupMemberName); 2598 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2599 : cast<ValueDecl>(Field), AS_public); 2600 MemberLookup.resolveKind(); 2601 ExprResult CtorArg 2602 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2603 ParamType, Loc, 2604 /*IsArrow=*/false, 2605 SS, 2606 /*TemplateKWLoc=*/SourceLocation(), 2607 /*FirstQualifierInScope=*/0, 2608 MemberLookup, 2609 /*TemplateArgs=*/0); 2610 if (CtorArg.isInvalid()) 2611 return true; 2612 2613 // C++11 [class.copy]p15: 2614 // - if a member m has rvalue reference type T&&, it is direct-initialized 2615 // with static_cast<T&&>(x.m); 2616 if (RefersToRValueRef(CtorArg.get())) { 2617 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2618 } 2619 2620 // When the field we are copying is an array, create index variables for 2621 // each dimension of the array. We use these index variables to subscript 2622 // the source array, and other clients (e.g., CodeGen) will perform the 2623 // necessary iteration with these index variables. 2624 SmallVector<VarDecl *, 4> IndexVariables; 2625 QualType BaseType = Field->getType(); 2626 QualType SizeType = SemaRef.Context.getSizeType(); 2627 bool InitializingArray = false; 2628 while (const ConstantArrayType *Array 2629 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2630 InitializingArray = true; 2631 // Create the iteration variable for this array index. 2632 IdentifierInfo *IterationVarName = 0; 2633 { 2634 SmallString<8> Str; 2635 llvm::raw_svector_ostream OS(Str); 2636 OS << "__i" << IndexVariables.size(); 2637 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2638 } 2639 VarDecl *IterationVar 2640 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2641 IterationVarName, SizeType, 2642 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2643 SC_None, SC_None); 2644 IndexVariables.push_back(IterationVar); 2645 2646 // Create a reference to the iteration variable. 2647 ExprResult IterationVarRef 2648 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2649 assert(!IterationVarRef.isInvalid() && 2650 "Reference to invented variable cannot fail!"); 2651 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2652 assert(!IterationVarRef.isInvalid() && 2653 "Conversion of invented variable cannot fail!"); 2654 2655 // Subscript the array with this iteration variable. 2656 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2657 IterationVarRef.take(), 2658 Loc); 2659 if (CtorArg.isInvalid()) 2660 return true; 2661 2662 BaseType = Array->getElementType(); 2663 } 2664 2665 // The array subscript expression is an lvalue, which is wrong for moving. 2666 if (Moving && InitializingArray) 2667 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2668 2669 // Construct the entity that we will be initializing. For an array, this 2670 // will be first element in the array, which may require several levels 2671 // of array-subscript entities. 2672 SmallVector<InitializedEntity, 4> Entities; 2673 Entities.reserve(1 + IndexVariables.size()); 2674 if (Indirect) 2675 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2676 else 2677 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2678 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2679 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2680 0, 2681 Entities.back())); 2682 2683 // Direct-initialize to use the copy constructor. 2684 InitializationKind InitKind = 2685 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2686 2687 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2688 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2689 &CtorArgE, 1); 2690 2691 ExprResult MemberInit 2692 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2693 MultiExprArg(&CtorArgE, 1)); 2694 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2695 if (MemberInit.isInvalid()) 2696 return true; 2697 2698 if (Indirect) { 2699 assert(IndexVariables.size() == 0 && 2700 "Indirect field improperly initialized"); 2701 CXXMemberInit 2702 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2703 Loc, Loc, 2704 MemberInit.takeAs<Expr>(), 2705 Loc); 2706 } else 2707 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2708 Loc, MemberInit.takeAs<Expr>(), 2709 Loc, 2710 IndexVariables.data(), 2711 IndexVariables.size()); 2712 return false; 2713 } 2714 2715 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2716 2717 QualType FieldBaseElementType = 2718 SemaRef.Context.getBaseElementType(Field->getType()); 2719 2720 if (FieldBaseElementType->isRecordType()) { 2721 InitializedEntity InitEntity 2722 = Indirect? InitializedEntity::InitializeMember(Indirect) 2723 : InitializedEntity::InitializeMember(Field); 2724 InitializationKind InitKind = 2725 InitializationKind::CreateDefault(Loc); 2726 2727 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2728 ExprResult MemberInit = 2729 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2730 2731 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2732 if (MemberInit.isInvalid()) 2733 return true; 2734 2735 if (Indirect) 2736 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2737 Indirect, Loc, 2738 Loc, 2739 MemberInit.get(), 2740 Loc); 2741 else 2742 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2743 Field, Loc, Loc, 2744 MemberInit.get(), 2745 Loc); 2746 return false; 2747 } 2748 2749 if (!Field->getParent()->isUnion()) { 2750 if (FieldBaseElementType->isReferenceType()) { 2751 SemaRef.Diag(Constructor->getLocation(), 2752 diag::err_uninitialized_member_in_ctor) 2753 << (int)Constructor->isImplicit() 2754 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2755 << 0 << Field->getDeclName(); 2756 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2757 return true; 2758 } 2759 2760 if (FieldBaseElementType.isConstQualified()) { 2761 SemaRef.Diag(Constructor->getLocation(), 2762 diag::err_uninitialized_member_in_ctor) 2763 << (int)Constructor->isImplicit() 2764 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2765 << 1 << Field->getDeclName(); 2766 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2767 return true; 2768 } 2769 } 2770 2771 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2772 FieldBaseElementType->isObjCRetainableType() && 2773 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2774 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2775 // Instant objects: 2776 // Default-initialize Objective-C pointers to NULL. 2777 CXXMemberInit 2778 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2779 Loc, Loc, 2780 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2781 Loc); 2782 return false; 2783 } 2784 2785 // Nothing to initialize. 2786 CXXMemberInit = 0; 2787 return false; 2788} 2789 2790namespace { 2791struct BaseAndFieldInfo { 2792 Sema &S; 2793 CXXConstructorDecl *Ctor; 2794 bool AnyErrorsInInits; 2795 ImplicitInitializerKind IIK; 2796 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2797 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2798 2799 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2800 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2801 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2802 if (Generated && Ctor->isCopyConstructor()) 2803 IIK = IIK_Copy; 2804 else if (Generated && Ctor->isMoveConstructor()) 2805 IIK = IIK_Move; 2806 else 2807 IIK = IIK_Default; 2808 } 2809 2810 bool isImplicitCopyOrMove() const { 2811 switch (IIK) { 2812 case IIK_Copy: 2813 case IIK_Move: 2814 return true; 2815 2816 case IIK_Default: 2817 return false; 2818 } 2819 2820 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2821 } 2822}; 2823} 2824 2825/// \brief Determine whether the given indirect field declaration is somewhere 2826/// within an anonymous union. 2827static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2828 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2829 CEnd = F->chain_end(); 2830 C != CEnd; ++C) 2831 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2832 if (Record->isUnion()) 2833 return true; 2834 2835 return false; 2836} 2837 2838/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2839/// array type. 2840static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2841 if (T->isIncompleteArrayType()) 2842 return true; 2843 2844 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2845 if (!ArrayT->getSize()) 2846 return true; 2847 2848 T = ArrayT->getElementType(); 2849 } 2850 2851 return false; 2852} 2853 2854static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 2855 FieldDecl *Field, 2856 IndirectFieldDecl *Indirect = 0) { 2857 2858 // Overwhelmingly common case: we have a direct initializer for this field. 2859 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) { 2860 Info.AllToInit.push_back(Init); 2861 return false; 2862 } 2863 2864 // C++0x [class.base.init]p8: if the entity is a non-static data member that 2865 // has a brace-or-equal-initializer, the entity is initialized as specified 2866 // in [dcl.init]. 2867 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 2868 CXXCtorInitializer *Init; 2869 if (Indirect) 2870 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2871 SourceLocation(), 2872 SourceLocation(), 0, 2873 SourceLocation()); 2874 else 2875 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2876 SourceLocation(), 2877 SourceLocation(), 0, 2878 SourceLocation()); 2879 Info.AllToInit.push_back(Init); 2880 2881 // Check whether this initializer makes the field "used". 2882 Expr *InitExpr = Field->getInClassInitializer(); 2883 if (Field->getType()->isRecordType() || 2884 (InitExpr && InitExpr->HasSideEffects(SemaRef.Context))) 2885 SemaRef.UnusedPrivateFields.remove(Field); 2886 2887 return false; 2888 } 2889 2890 // Don't build an implicit initializer for union members if none was 2891 // explicitly specified. 2892 if (Field->getParent()->isUnion() || 2893 (Indirect && isWithinAnonymousUnion(Indirect))) 2894 return false; 2895 2896 // Don't initialize incomplete or zero-length arrays. 2897 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 2898 return false; 2899 2900 // Don't try to build an implicit initializer if there were semantic 2901 // errors in any of the initializers (and therefore we might be 2902 // missing some that the user actually wrote). 2903 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 2904 return false; 2905 2906 CXXCtorInitializer *Init = 0; 2907 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 2908 Indirect, Init)) 2909 return true; 2910 2911 if (Init) 2912 Info.AllToInit.push_back(Init); 2913 2914 return false; 2915} 2916 2917bool 2918Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 2919 CXXCtorInitializer *Initializer) { 2920 assert(Initializer->isDelegatingInitializer()); 2921 Constructor->setNumCtorInitializers(1); 2922 CXXCtorInitializer **initializer = 2923 new (Context) CXXCtorInitializer*[1]; 2924 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 2925 Constructor->setCtorInitializers(initializer); 2926 2927 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 2928 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 2929 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 2930 } 2931 2932 DelegatingCtorDecls.push_back(Constructor); 2933 2934 return false; 2935} 2936 2937bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 2938 CXXCtorInitializer **Initializers, 2939 unsigned NumInitializers, 2940 bool AnyErrors) { 2941 if (Constructor->isDependentContext()) { 2942 // Just store the initializers as written, they will be checked during 2943 // instantiation. 2944 if (NumInitializers > 0) { 2945 Constructor->setNumCtorInitializers(NumInitializers); 2946 CXXCtorInitializer **baseOrMemberInitializers = 2947 new (Context) CXXCtorInitializer*[NumInitializers]; 2948 memcpy(baseOrMemberInitializers, Initializers, 2949 NumInitializers * sizeof(CXXCtorInitializer*)); 2950 Constructor->setCtorInitializers(baseOrMemberInitializers); 2951 } 2952 2953 return false; 2954 } 2955 2956 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 2957 2958 // We need to build the initializer AST according to order of construction 2959 // and not what user specified in the Initializers list. 2960 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 2961 if (!ClassDecl) 2962 return true; 2963 2964 bool HadError = false; 2965 2966 for (unsigned i = 0; i < NumInitializers; i++) { 2967 CXXCtorInitializer *Member = Initializers[i]; 2968 2969 if (Member->isBaseInitializer()) 2970 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 2971 else 2972 Info.AllBaseFields[Member->getAnyMember()] = Member; 2973 } 2974 2975 // Keep track of the direct virtual bases. 2976 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 2977 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 2978 E = ClassDecl->bases_end(); I != E; ++I) { 2979 if (I->isVirtual()) 2980 DirectVBases.insert(I); 2981 } 2982 2983 // Push virtual bases before others. 2984 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 2985 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 2986 2987 if (CXXCtorInitializer *Value 2988 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 2989 Info.AllToInit.push_back(Value); 2990 } else if (!AnyErrors) { 2991 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 2992 CXXCtorInitializer *CXXBaseInit; 2993 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 2994 VBase, IsInheritedVirtualBase, 2995 CXXBaseInit)) { 2996 HadError = true; 2997 continue; 2998 } 2999 3000 Info.AllToInit.push_back(CXXBaseInit); 3001 } 3002 } 3003 3004 // Non-virtual bases. 3005 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3006 E = ClassDecl->bases_end(); Base != E; ++Base) { 3007 // Virtuals are in the virtual base list and already constructed. 3008 if (Base->isVirtual()) 3009 continue; 3010 3011 if (CXXCtorInitializer *Value 3012 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3013 Info.AllToInit.push_back(Value); 3014 } else if (!AnyErrors) { 3015 CXXCtorInitializer *CXXBaseInit; 3016 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3017 Base, /*IsInheritedVirtualBase=*/false, 3018 CXXBaseInit)) { 3019 HadError = true; 3020 continue; 3021 } 3022 3023 Info.AllToInit.push_back(CXXBaseInit); 3024 } 3025 } 3026 3027 // Fields. 3028 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3029 MemEnd = ClassDecl->decls_end(); 3030 Mem != MemEnd; ++Mem) { 3031 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3032 // C++ [class.bit]p2: 3033 // A declaration for a bit-field that omits the identifier declares an 3034 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3035 // initialized. 3036 if (F->isUnnamedBitfield()) 3037 continue; 3038 3039 // If we're not generating the implicit copy/move constructor, then we'll 3040 // handle anonymous struct/union fields based on their individual 3041 // indirect fields. 3042 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3043 continue; 3044 3045 if (CollectFieldInitializer(*this, Info, F)) 3046 HadError = true; 3047 continue; 3048 } 3049 3050 // Beyond this point, we only consider default initialization. 3051 if (Info.IIK != IIK_Default) 3052 continue; 3053 3054 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3055 if (F->getType()->isIncompleteArrayType()) { 3056 assert(ClassDecl->hasFlexibleArrayMember() && 3057 "Incomplete array type is not valid"); 3058 continue; 3059 } 3060 3061 // Initialize each field of an anonymous struct individually. 3062 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3063 HadError = true; 3064 3065 continue; 3066 } 3067 } 3068 3069 NumInitializers = Info.AllToInit.size(); 3070 if (NumInitializers > 0) { 3071 Constructor->setNumCtorInitializers(NumInitializers); 3072 CXXCtorInitializer **baseOrMemberInitializers = 3073 new (Context) CXXCtorInitializer*[NumInitializers]; 3074 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3075 NumInitializers * sizeof(CXXCtorInitializer*)); 3076 Constructor->setCtorInitializers(baseOrMemberInitializers); 3077 3078 // Constructors implicitly reference the base and member 3079 // destructors. 3080 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3081 Constructor->getParent()); 3082 } 3083 3084 return HadError; 3085} 3086 3087static void *GetKeyForTopLevelField(FieldDecl *Field) { 3088 // For anonymous unions, use the class declaration as the key. 3089 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3090 if (RT->getDecl()->isAnonymousStructOrUnion()) 3091 return static_cast<void *>(RT->getDecl()); 3092 } 3093 return static_cast<void *>(Field); 3094} 3095 3096static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3097 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3098} 3099 3100static void *GetKeyForMember(ASTContext &Context, 3101 CXXCtorInitializer *Member) { 3102 if (!Member->isAnyMemberInitializer()) 3103 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3104 3105 // For fields injected into the class via declaration of an anonymous union, 3106 // use its anonymous union class declaration as the unique key. 3107 FieldDecl *Field = Member->getAnyMember(); 3108 3109 // If the field is a member of an anonymous struct or union, our key 3110 // is the anonymous record decl that's a direct child of the class. 3111 RecordDecl *RD = Field->getParent(); 3112 if (RD->isAnonymousStructOrUnion()) { 3113 while (true) { 3114 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3115 if (Parent->isAnonymousStructOrUnion()) 3116 RD = Parent; 3117 else 3118 break; 3119 } 3120 3121 return static_cast<void *>(RD); 3122 } 3123 3124 return static_cast<void *>(Field); 3125} 3126 3127static void 3128DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3129 const CXXConstructorDecl *Constructor, 3130 CXXCtorInitializer **Inits, 3131 unsigned NumInits) { 3132 if (Constructor->getDeclContext()->isDependentContext()) 3133 return; 3134 3135 // Don't check initializers order unless the warning is enabled at the 3136 // location of at least one initializer. 3137 bool ShouldCheckOrder = false; 3138 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3139 CXXCtorInitializer *Init = Inits[InitIndex]; 3140 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3141 Init->getSourceLocation()) 3142 != DiagnosticsEngine::Ignored) { 3143 ShouldCheckOrder = true; 3144 break; 3145 } 3146 } 3147 if (!ShouldCheckOrder) 3148 return; 3149 3150 // Build the list of bases and members in the order that they'll 3151 // actually be initialized. The explicit initializers should be in 3152 // this same order but may be missing things. 3153 SmallVector<const void*, 32> IdealInitKeys; 3154 3155 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3156 3157 // 1. Virtual bases. 3158 for (CXXRecordDecl::base_class_const_iterator VBase = 3159 ClassDecl->vbases_begin(), 3160 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3161 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3162 3163 // 2. Non-virtual bases. 3164 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3165 E = ClassDecl->bases_end(); Base != E; ++Base) { 3166 if (Base->isVirtual()) 3167 continue; 3168 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3169 } 3170 3171 // 3. Direct fields. 3172 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3173 E = ClassDecl->field_end(); Field != E; ++Field) { 3174 if (Field->isUnnamedBitfield()) 3175 continue; 3176 3177 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3178 } 3179 3180 unsigned NumIdealInits = IdealInitKeys.size(); 3181 unsigned IdealIndex = 0; 3182 3183 CXXCtorInitializer *PrevInit = 0; 3184 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3185 CXXCtorInitializer *Init = Inits[InitIndex]; 3186 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3187 3188 // Scan forward to try to find this initializer in the idealized 3189 // initializers list. 3190 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3191 if (InitKey == IdealInitKeys[IdealIndex]) 3192 break; 3193 3194 // If we didn't find this initializer, it must be because we 3195 // scanned past it on a previous iteration. That can only 3196 // happen if we're out of order; emit a warning. 3197 if (IdealIndex == NumIdealInits && PrevInit) { 3198 Sema::SemaDiagnosticBuilder D = 3199 SemaRef.Diag(PrevInit->getSourceLocation(), 3200 diag::warn_initializer_out_of_order); 3201 3202 if (PrevInit->isAnyMemberInitializer()) 3203 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3204 else 3205 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3206 3207 if (Init->isAnyMemberInitializer()) 3208 D << 0 << Init->getAnyMember()->getDeclName(); 3209 else 3210 D << 1 << Init->getTypeSourceInfo()->getType(); 3211 3212 // Move back to the initializer's location in the ideal list. 3213 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3214 if (InitKey == IdealInitKeys[IdealIndex]) 3215 break; 3216 3217 assert(IdealIndex != NumIdealInits && 3218 "initializer not found in initializer list"); 3219 } 3220 3221 PrevInit = Init; 3222 } 3223} 3224 3225namespace { 3226bool CheckRedundantInit(Sema &S, 3227 CXXCtorInitializer *Init, 3228 CXXCtorInitializer *&PrevInit) { 3229 if (!PrevInit) { 3230 PrevInit = Init; 3231 return false; 3232 } 3233 3234 if (FieldDecl *Field = Init->getMember()) 3235 S.Diag(Init->getSourceLocation(), 3236 diag::err_multiple_mem_initialization) 3237 << Field->getDeclName() 3238 << Init->getSourceRange(); 3239 else { 3240 const Type *BaseClass = Init->getBaseClass(); 3241 assert(BaseClass && "neither field nor base"); 3242 S.Diag(Init->getSourceLocation(), 3243 diag::err_multiple_base_initialization) 3244 << QualType(BaseClass, 0) 3245 << Init->getSourceRange(); 3246 } 3247 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3248 << 0 << PrevInit->getSourceRange(); 3249 3250 return true; 3251} 3252 3253typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3254typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3255 3256bool CheckRedundantUnionInit(Sema &S, 3257 CXXCtorInitializer *Init, 3258 RedundantUnionMap &Unions) { 3259 FieldDecl *Field = Init->getAnyMember(); 3260 RecordDecl *Parent = Field->getParent(); 3261 NamedDecl *Child = Field; 3262 3263 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3264 if (Parent->isUnion()) { 3265 UnionEntry &En = Unions[Parent]; 3266 if (En.first && En.first != Child) { 3267 S.Diag(Init->getSourceLocation(), 3268 diag::err_multiple_mem_union_initialization) 3269 << Field->getDeclName() 3270 << Init->getSourceRange(); 3271 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3272 << 0 << En.second->getSourceRange(); 3273 return true; 3274 } 3275 if (!En.first) { 3276 En.first = Child; 3277 En.second = Init; 3278 } 3279 if (!Parent->isAnonymousStructOrUnion()) 3280 return false; 3281 } 3282 3283 Child = Parent; 3284 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3285 } 3286 3287 return false; 3288} 3289} 3290 3291/// ActOnMemInitializers - Handle the member initializers for a constructor. 3292void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3293 SourceLocation ColonLoc, 3294 CXXCtorInitializer **meminits, 3295 unsigned NumMemInits, 3296 bool AnyErrors) { 3297 if (!ConstructorDecl) 3298 return; 3299 3300 AdjustDeclIfTemplate(ConstructorDecl); 3301 3302 CXXConstructorDecl *Constructor 3303 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3304 3305 if (!Constructor) { 3306 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3307 return; 3308 } 3309 3310 CXXCtorInitializer **MemInits = 3311 reinterpret_cast<CXXCtorInitializer **>(meminits); 3312 3313 // Mapping for the duplicate initializers check. 3314 // For member initializers, this is keyed with a FieldDecl*. 3315 // For base initializers, this is keyed with a Type*. 3316 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3317 3318 // Mapping for the inconsistent anonymous-union initializers check. 3319 RedundantUnionMap MemberUnions; 3320 3321 bool HadError = false; 3322 for (unsigned i = 0; i < NumMemInits; i++) { 3323 CXXCtorInitializer *Init = MemInits[i]; 3324 3325 // Set the source order index. 3326 Init->setSourceOrder(i); 3327 3328 if (Init->isAnyMemberInitializer()) { 3329 FieldDecl *Field = Init->getAnyMember(); 3330 if (CheckRedundantInit(*this, Init, Members[Field]) || 3331 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3332 HadError = true; 3333 } else if (Init->isBaseInitializer()) { 3334 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3335 if (CheckRedundantInit(*this, Init, Members[Key])) 3336 HadError = true; 3337 } else { 3338 assert(Init->isDelegatingInitializer()); 3339 // This must be the only initializer 3340 if (i != 0 || NumMemInits > 1) { 3341 Diag(MemInits[0]->getSourceLocation(), 3342 diag::err_delegating_initializer_alone) 3343 << MemInits[0]->getSourceRange(); 3344 HadError = true; 3345 // We will treat this as being the only initializer. 3346 } 3347 SetDelegatingInitializer(Constructor, MemInits[i]); 3348 // Return immediately as the initializer is set. 3349 return; 3350 } 3351 } 3352 3353 if (HadError) 3354 return; 3355 3356 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3357 3358 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3359} 3360 3361void 3362Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3363 CXXRecordDecl *ClassDecl) { 3364 // Ignore dependent contexts. Also ignore unions, since their members never 3365 // have destructors implicitly called. 3366 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3367 return; 3368 3369 // FIXME: all the access-control diagnostics are positioned on the 3370 // field/base declaration. That's probably good; that said, the 3371 // user might reasonably want to know why the destructor is being 3372 // emitted, and we currently don't say. 3373 3374 // Non-static data members. 3375 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3376 E = ClassDecl->field_end(); I != E; ++I) { 3377 FieldDecl *Field = *I; 3378 if (Field->isInvalidDecl()) 3379 continue; 3380 3381 // Don't destroy incomplete or zero-length arrays. 3382 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3383 continue; 3384 3385 QualType FieldType = Context.getBaseElementType(Field->getType()); 3386 3387 const RecordType* RT = FieldType->getAs<RecordType>(); 3388 if (!RT) 3389 continue; 3390 3391 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3392 if (FieldClassDecl->isInvalidDecl()) 3393 continue; 3394 if (FieldClassDecl->hasIrrelevantDestructor()) 3395 continue; 3396 // The destructor for an implicit anonymous union member is never invoked. 3397 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3398 continue; 3399 3400 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3401 assert(Dtor && "No dtor found for FieldClassDecl!"); 3402 CheckDestructorAccess(Field->getLocation(), Dtor, 3403 PDiag(diag::err_access_dtor_field) 3404 << Field->getDeclName() 3405 << FieldType); 3406 3407 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3408 DiagnoseUseOfDecl(Dtor, Location); 3409 } 3410 3411 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3412 3413 // Bases. 3414 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3415 E = ClassDecl->bases_end(); Base != E; ++Base) { 3416 // Bases are always records in a well-formed non-dependent class. 3417 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3418 3419 // Remember direct virtual bases. 3420 if (Base->isVirtual()) 3421 DirectVirtualBases.insert(RT); 3422 3423 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3424 // If our base class is invalid, we probably can't get its dtor anyway. 3425 if (BaseClassDecl->isInvalidDecl()) 3426 continue; 3427 if (BaseClassDecl->hasIrrelevantDestructor()) 3428 continue; 3429 3430 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3431 assert(Dtor && "No dtor found for BaseClassDecl!"); 3432 3433 // FIXME: caret should be on the start of the class name 3434 CheckDestructorAccess(Base->getLocStart(), Dtor, 3435 PDiag(diag::err_access_dtor_base) 3436 << Base->getType() 3437 << Base->getSourceRange(), 3438 Context.getTypeDeclType(ClassDecl)); 3439 3440 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3441 DiagnoseUseOfDecl(Dtor, Location); 3442 } 3443 3444 // Virtual bases. 3445 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3446 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3447 3448 // Bases are always records in a well-formed non-dependent class. 3449 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3450 3451 // Ignore direct virtual bases. 3452 if (DirectVirtualBases.count(RT)) 3453 continue; 3454 3455 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3456 // If our base class is invalid, we probably can't get its dtor anyway. 3457 if (BaseClassDecl->isInvalidDecl()) 3458 continue; 3459 if (BaseClassDecl->hasIrrelevantDestructor()) 3460 continue; 3461 3462 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3463 assert(Dtor && "No dtor found for BaseClassDecl!"); 3464 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3465 PDiag(diag::err_access_dtor_vbase) 3466 << VBase->getType(), 3467 Context.getTypeDeclType(ClassDecl)); 3468 3469 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3470 DiagnoseUseOfDecl(Dtor, Location); 3471 } 3472} 3473 3474void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3475 if (!CDtorDecl) 3476 return; 3477 3478 if (CXXConstructorDecl *Constructor 3479 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3480 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3481} 3482 3483bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3484 unsigned DiagID, AbstractDiagSelID SelID) { 3485 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3486 unsigned DiagID; 3487 AbstractDiagSelID SelID; 3488 3489 public: 3490 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3491 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3492 3493 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3494 if (SelID == -1) 3495 S.Diag(Loc, DiagID) << T; 3496 else 3497 S.Diag(Loc, DiagID) << SelID << T; 3498 } 3499 } Diagnoser(DiagID, SelID); 3500 3501 return RequireNonAbstractType(Loc, T, Diagnoser); 3502} 3503 3504bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3505 TypeDiagnoser &Diagnoser) { 3506 if (!getLangOpts().CPlusPlus) 3507 return false; 3508 3509 if (const ArrayType *AT = Context.getAsArrayType(T)) 3510 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3511 3512 if (const PointerType *PT = T->getAs<PointerType>()) { 3513 // Find the innermost pointer type. 3514 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3515 PT = T; 3516 3517 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3518 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3519 } 3520 3521 const RecordType *RT = T->getAs<RecordType>(); 3522 if (!RT) 3523 return false; 3524 3525 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3526 3527 // We can't answer whether something is abstract until it has a 3528 // definition. If it's currently being defined, we'll walk back 3529 // over all the declarations when we have a full definition. 3530 const CXXRecordDecl *Def = RD->getDefinition(); 3531 if (!Def || Def->isBeingDefined()) 3532 return false; 3533 3534 if (!RD->isAbstract()) 3535 return false; 3536 3537 Diagnoser.diagnose(*this, Loc, T); 3538 DiagnoseAbstractType(RD); 3539 3540 return true; 3541} 3542 3543void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3544 // Check if we've already emitted the list of pure virtual functions 3545 // for this class. 3546 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3547 return; 3548 3549 CXXFinalOverriderMap FinalOverriders; 3550 RD->getFinalOverriders(FinalOverriders); 3551 3552 // Keep a set of seen pure methods so we won't diagnose the same method 3553 // more than once. 3554 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3555 3556 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3557 MEnd = FinalOverriders.end(); 3558 M != MEnd; 3559 ++M) { 3560 for (OverridingMethods::iterator SO = M->second.begin(), 3561 SOEnd = M->second.end(); 3562 SO != SOEnd; ++SO) { 3563 // C++ [class.abstract]p4: 3564 // A class is abstract if it contains or inherits at least one 3565 // pure virtual function for which the final overrider is pure 3566 // virtual. 3567 3568 // 3569 if (SO->second.size() != 1) 3570 continue; 3571 3572 if (!SO->second.front().Method->isPure()) 3573 continue; 3574 3575 if (!SeenPureMethods.insert(SO->second.front().Method)) 3576 continue; 3577 3578 Diag(SO->second.front().Method->getLocation(), 3579 diag::note_pure_virtual_function) 3580 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3581 } 3582 } 3583 3584 if (!PureVirtualClassDiagSet) 3585 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3586 PureVirtualClassDiagSet->insert(RD); 3587} 3588 3589namespace { 3590struct AbstractUsageInfo { 3591 Sema &S; 3592 CXXRecordDecl *Record; 3593 CanQualType AbstractType; 3594 bool Invalid; 3595 3596 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3597 : S(S), Record(Record), 3598 AbstractType(S.Context.getCanonicalType( 3599 S.Context.getTypeDeclType(Record))), 3600 Invalid(false) {} 3601 3602 void DiagnoseAbstractType() { 3603 if (Invalid) return; 3604 S.DiagnoseAbstractType(Record); 3605 Invalid = true; 3606 } 3607 3608 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3609}; 3610 3611struct CheckAbstractUsage { 3612 AbstractUsageInfo &Info; 3613 const NamedDecl *Ctx; 3614 3615 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3616 : Info(Info), Ctx(Ctx) {} 3617 3618 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3619 switch (TL.getTypeLocClass()) { 3620#define ABSTRACT_TYPELOC(CLASS, PARENT) 3621#define TYPELOC(CLASS, PARENT) \ 3622 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3623#include "clang/AST/TypeLocNodes.def" 3624 } 3625 } 3626 3627 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3628 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3629 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3630 if (!TL.getArg(I)) 3631 continue; 3632 3633 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3634 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3635 } 3636 } 3637 3638 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3639 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3640 } 3641 3642 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3643 // Visit the type parameters from a permissive context. 3644 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3645 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3646 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3647 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3648 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3649 // TODO: other template argument types? 3650 } 3651 } 3652 3653 // Visit pointee types from a permissive context. 3654#define CheckPolymorphic(Type) \ 3655 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3656 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3657 } 3658 CheckPolymorphic(PointerTypeLoc) 3659 CheckPolymorphic(ReferenceTypeLoc) 3660 CheckPolymorphic(MemberPointerTypeLoc) 3661 CheckPolymorphic(BlockPointerTypeLoc) 3662 CheckPolymorphic(AtomicTypeLoc) 3663 3664 /// Handle all the types we haven't given a more specific 3665 /// implementation for above. 3666 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3667 // Every other kind of type that we haven't called out already 3668 // that has an inner type is either (1) sugar or (2) contains that 3669 // inner type in some way as a subobject. 3670 if (TypeLoc Next = TL.getNextTypeLoc()) 3671 return Visit(Next, Sel); 3672 3673 // If there's no inner type and we're in a permissive context, 3674 // don't diagnose. 3675 if (Sel == Sema::AbstractNone) return; 3676 3677 // Check whether the type matches the abstract type. 3678 QualType T = TL.getType(); 3679 if (T->isArrayType()) { 3680 Sel = Sema::AbstractArrayType; 3681 T = Info.S.Context.getBaseElementType(T); 3682 } 3683 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3684 if (CT != Info.AbstractType) return; 3685 3686 // It matched; do some magic. 3687 if (Sel == Sema::AbstractArrayType) { 3688 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3689 << T << TL.getSourceRange(); 3690 } else { 3691 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3692 << Sel << T << TL.getSourceRange(); 3693 } 3694 Info.DiagnoseAbstractType(); 3695 } 3696}; 3697 3698void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3699 Sema::AbstractDiagSelID Sel) { 3700 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3701} 3702 3703} 3704 3705/// Check for invalid uses of an abstract type in a method declaration. 3706static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3707 CXXMethodDecl *MD) { 3708 // No need to do the check on definitions, which require that 3709 // the return/param types be complete. 3710 if (MD->doesThisDeclarationHaveABody()) 3711 return; 3712 3713 // For safety's sake, just ignore it if we don't have type source 3714 // information. This should never happen for non-implicit methods, 3715 // but... 3716 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3717 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3718} 3719 3720/// Check for invalid uses of an abstract type within a class definition. 3721static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3722 CXXRecordDecl *RD) { 3723 for (CXXRecordDecl::decl_iterator 3724 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3725 Decl *D = *I; 3726 if (D->isImplicit()) continue; 3727 3728 // Methods and method templates. 3729 if (isa<CXXMethodDecl>(D)) { 3730 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3731 } else if (isa<FunctionTemplateDecl>(D)) { 3732 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3733 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3734 3735 // Fields and static variables. 3736 } else if (isa<FieldDecl>(D)) { 3737 FieldDecl *FD = cast<FieldDecl>(D); 3738 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3739 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3740 } else if (isa<VarDecl>(D)) { 3741 VarDecl *VD = cast<VarDecl>(D); 3742 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3743 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3744 3745 // Nested classes and class templates. 3746 } else if (isa<CXXRecordDecl>(D)) { 3747 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3748 } else if (isa<ClassTemplateDecl>(D)) { 3749 CheckAbstractClassUsage(Info, 3750 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3751 } 3752 } 3753} 3754 3755/// \brief Perform semantic checks on a class definition that has been 3756/// completing, introducing implicitly-declared members, checking for 3757/// abstract types, etc. 3758void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3759 if (!Record) 3760 return; 3761 3762 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3763 AbstractUsageInfo Info(*this, Record); 3764 CheckAbstractClassUsage(Info, Record); 3765 } 3766 3767 // If this is not an aggregate type and has no user-declared constructor, 3768 // complain about any non-static data members of reference or const scalar 3769 // type, since they will never get initializers. 3770 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3771 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3772 !Record->isLambda()) { 3773 bool Complained = false; 3774 for (RecordDecl::field_iterator F = Record->field_begin(), 3775 FEnd = Record->field_end(); 3776 F != FEnd; ++F) { 3777 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3778 continue; 3779 3780 if (F->getType()->isReferenceType() || 3781 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3782 if (!Complained) { 3783 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3784 << Record->getTagKind() << Record; 3785 Complained = true; 3786 } 3787 3788 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3789 << F->getType()->isReferenceType() 3790 << F->getDeclName(); 3791 } 3792 } 3793 } 3794 3795 if (Record->isDynamicClass() && !Record->isDependentType()) 3796 DynamicClasses.push_back(Record); 3797 3798 if (Record->getIdentifier()) { 3799 // C++ [class.mem]p13: 3800 // If T is the name of a class, then each of the following shall have a 3801 // name different from T: 3802 // - every member of every anonymous union that is a member of class T. 3803 // 3804 // C++ [class.mem]p14: 3805 // In addition, if class T has a user-declared constructor (12.1), every 3806 // non-static data member of class T shall have a name different from T. 3807 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3808 R.first != R.second; ++R.first) { 3809 NamedDecl *D = *R.first; 3810 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3811 isa<IndirectFieldDecl>(D)) { 3812 Diag(D->getLocation(), diag::err_member_name_of_class) 3813 << D->getDeclName(); 3814 break; 3815 } 3816 } 3817 } 3818 3819 // Warn if the class has virtual methods but non-virtual public destructor. 3820 if (Record->isPolymorphic() && !Record->isDependentType()) { 3821 CXXDestructorDecl *dtor = Record->getDestructor(); 3822 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3823 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3824 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3825 } 3826 3827 // See if a method overloads virtual methods in a base 3828 /// class without overriding any. 3829 if (!Record->isDependentType()) { 3830 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3831 MEnd = Record->method_end(); 3832 M != MEnd; ++M) { 3833 if (!M->isStatic()) 3834 DiagnoseHiddenVirtualMethods(Record, *M); 3835 } 3836 } 3837 3838 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3839 // function that is not a constructor declares that member function to be 3840 // const. [...] The class of which that function is a member shall be 3841 // a literal type. 3842 // 3843 // If the class has virtual bases, any constexpr members will already have 3844 // been diagnosed by the checks performed on the member declaration, so 3845 // suppress this (less useful) diagnostic. 3846 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3847 !Record->isLiteral() && !Record->getNumVBases()) { 3848 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3849 MEnd = Record->method_end(); 3850 M != MEnd; ++M) { 3851 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 3852 switch (Record->getTemplateSpecializationKind()) { 3853 case TSK_ImplicitInstantiation: 3854 case TSK_ExplicitInstantiationDeclaration: 3855 case TSK_ExplicitInstantiationDefinition: 3856 // If a template instantiates to a non-literal type, but its members 3857 // instantiate to constexpr functions, the template is technically 3858 // ill-formed, but we allow it for sanity. 3859 continue; 3860 3861 case TSK_Undeclared: 3862 case TSK_ExplicitSpecialization: 3863 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 3864 diag::err_constexpr_method_non_literal); 3865 break; 3866 } 3867 3868 // Only produce one error per class. 3869 break; 3870 } 3871 } 3872 } 3873 3874 // Declare inherited constructors. We do this eagerly here because: 3875 // - The standard requires an eager diagnostic for conflicting inherited 3876 // constructors from different classes. 3877 // - The lazy declaration of the other implicit constructors is so as to not 3878 // waste space and performance on classes that are not meant to be 3879 // instantiated (e.g. meta-functions). This doesn't apply to classes that 3880 // have inherited constructors. 3881 DeclareInheritedConstructors(Record); 3882 3883 if (!Record->isDependentType()) 3884 CheckExplicitlyDefaultedMethods(Record); 3885} 3886 3887void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 3888 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 3889 ME = Record->method_end(); 3890 MI != ME; ++MI) 3891 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 3892 CheckExplicitlyDefaultedSpecialMember(*MI); 3893} 3894 3895/// Is the special member function which would be selected to perform the 3896/// specified operation on the specified class type a constexpr constructor? 3897static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3898 Sema::CXXSpecialMember CSM, 3899 bool ConstArg) { 3900 Sema::SpecialMemberOverloadResult *SMOR = 3901 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 3902 false, false, false, false); 3903 if (!SMOR || !SMOR->getMethod()) 3904 // A constructor we wouldn't select can't be "involved in initializing" 3905 // anything. 3906 return true; 3907 return SMOR->getMethod()->isConstexpr(); 3908} 3909 3910/// Determine whether the specified special member function would be constexpr 3911/// if it were implicitly defined. 3912static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 3913 Sema::CXXSpecialMember CSM, 3914 bool ConstArg) { 3915 if (!S.getLangOpts().CPlusPlus0x) 3916 return false; 3917 3918 // C++11 [dcl.constexpr]p4: 3919 // In the definition of a constexpr constructor [...] 3920 switch (CSM) { 3921 case Sema::CXXDefaultConstructor: 3922 // Since default constructor lookup is essentially trivial (and cannot 3923 // involve, for instance, template instantiation), we compute whether a 3924 // defaulted default constructor is constexpr directly within CXXRecordDecl. 3925 // 3926 // This is important for performance; we need to know whether the default 3927 // constructor is constexpr to determine whether the type is a literal type. 3928 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 3929 3930 case Sema::CXXCopyConstructor: 3931 case Sema::CXXMoveConstructor: 3932 // For copy or move constructors, we need to perform overload resolution. 3933 break; 3934 3935 case Sema::CXXCopyAssignment: 3936 case Sema::CXXMoveAssignment: 3937 case Sema::CXXDestructor: 3938 case Sema::CXXInvalid: 3939 return false; 3940 } 3941 3942 // -- if the class is a non-empty union, or for each non-empty anonymous 3943 // union member of a non-union class, exactly one non-static data member 3944 // shall be initialized; [DR1359] 3945 // 3946 // If we squint, this is guaranteed, since exactly one non-static data member 3947 // will be initialized (if the constructor isn't deleted), we just don't know 3948 // which one. 3949 if (ClassDecl->isUnion()) 3950 return true; 3951 3952 // -- the class shall not have any virtual base classes; 3953 if (ClassDecl->getNumVBases()) 3954 return false; 3955 3956 // -- every constructor involved in initializing [...] base class 3957 // sub-objects shall be a constexpr constructor; 3958 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 3959 BEnd = ClassDecl->bases_end(); 3960 B != BEnd; ++B) { 3961 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 3962 if (!BaseType) continue; 3963 3964 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 3965 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 3966 return false; 3967 } 3968 3969 // -- every constructor involved in initializing non-static data members 3970 // [...] shall be a constexpr constructor; 3971 // -- every non-static data member and base class sub-object shall be 3972 // initialized 3973 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 3974 FEnd = ClassDecl->field_end(); 3975 F != FEnd; ++F) { 3976 if (F->isInvalidDecl()) 3977 continue; 3978 if (const RecordType *RecordTy = 3979 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 3980 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 3981 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 3982 return false; 3983 } 3984 } 3985 3986 // All OK, it's constexpr! 3987 return true; 3988} 3989 3990void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 3991 CXXRecordDecl *RD = MD->getParent(); 3992 CXXSpecialMember CSM = getSpecialMember(MD); 3993 3994 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 3995 "not an explicitly-defaulted special member"); 3996 3997 // Whether this was the first-declared instance of the constructor. 3998 // This affects whether we implicitly add an exception spec and constexpr. 3999 bool First = MD == MD->getCanonicalDecl(); 4000 4001 bool HadError = false; 4002 4003 // C++11 [dcl.fct.def.default]p1: 4004 // A function that is explicitly defaulted shall 4005 // -- be a special member function (checked elsewhere), 4006 // -- have the same type (except for ref-qualifiers, and except that a 4007 // copy operation can take a non-const reference) as an implicit 4008 // declaration, and 4009 // -- not have default arguments. 4010 unsigned ExpectedParams = 1; 4011 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4012 ExpectedParams = 0; 4013 if (MD->getNumParams() != ExpectedParams) { 4014 // This also checks for default arguments: a copy or move constructor with a 4015 // default argument is classified as a default constructor, and assignment 4016 // operations and destructors can't have default arguments. 4017 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4018 << CSM << MD->getSourceRange(); 4019 HadError = true; 4020 } 4021 4022 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4023 4024 // Compute implicit exception specification, argument constness, constexpr 4025 // and triviality. 4026 ImplicitExceptionSpecification Spec(*this); 4027 bool CanHaveConstParam = false; 4028 bool Trivial; 4029 switch (CSM) { 4030 case CXXDefaultConstructor: 4031 Spec = ComputeDefaultedDefaultCtorExceptionSpec(RD); 4032 if (Spec.isDelayed()) 4033 // Exception specification depends on some deferred part of the class. 4034 // We'll try again when the class's definition has been fully processed. 4035 return; 4036 Trivial = RD->hasTrivialDefaultConstructor(); 4037 break; 4038 case CXXCopyConstructor: 4039 llvm::tie(Spec, CanHaveConstParam) = 4040 ComputeDefaultedCopyCtorExceptionSpecAndConst(RD); 4041 Trivial = RD->hasTrivialCopyConstructor(); 4042 break; 4043 case CXXCopyAssignment: 4044 llvm::tie(Spec, CanHaveConstParam) = 4045 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(RD); 4046 Trivial = RD->hasTrivialCopyAssignment(); 4047 break; 4048 case CXXMoveConstructor: 4049 Spec = ComputeDefaultedMoveCtorExceptionSpec(RD); 4050 Trivial = RD->hasTrivialMoveConstructor(); 4051 break; 4052 case CXXMoveAssignment: 4053 Spec = ComputeDefaultedMoveAssignmentExceptionSpec(RD); 4054 Trivial = RD->hasTrivialMoveAssignment(); 4055 break; 4056 case CXXDestructor: 4057 Spec = ComputeDefaultedDtorExceptionSpec(RD); 4058 Trivial = RD->hasTrivialDestructor(); 4059 break; 4060 case CXXInvalid: 4061 llvm_unreachable("non-special member explicitly defaulted!"); 4062 } 4063 4064 QualType ReturnType = Context.VoidTy; 4065 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4066 // Check for return type matching. 4067 ReturnType = Type->getResultType(); 4068 QualType ExpectedReturnType = 4069 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4070 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4071 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4072 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4073 HadError = true; 4074 } 4075 4076 // A defaulted special member cannot have cv-qualifiers. 4077 if (Type->getTypeQuals()) { 4078 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4079 << (CSM == CXXMoveAssignment); 4080 HadError = true; 4081 } 4082 } 4083 4084 // Check for parameter type matching. 4085 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4086 bool HasConstParam = false; 4087 if (ExpectedParams && ArgType->isReferenceType()) { 4088 // Argument must be reference to possibly-const T. 4089 QualType ReferentType = ArgType->getPointeeType(); 4090 HasConstParam = ReferentType.isConstQualified(); 4091 4092 if (ReferentType.isVolatileQualified()) { 4093 Diag(MD->getLocation(), 4094 diag::err_defaulted_special_member_volatile_param) << CSM; 4095 HadError = true; 4096 } 4097 4098 if (HasConstParam && !CanHaveConstParam) { 4099 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4100 Diag(MD->getLocation(), 4101 diag::err_defaulted_special_member_copy_const_param) 4102 << (CSM == CXXCopyAssignment); 4103 // FIXME: Explain why this special member can't be const. 4104 } else { 4105 Diag(MD->getLocation(), 4106 diag::err_defaulted_special_member_move_const_param) 4107 << (CSM == CXXMoveAssignment); 4108 } 4109 HadError = true; 4110 } 4111 4112 // If a function is explicitly defaulted on its first declaration, it shall 4113 // have the same parameter type as if it had been implicitly declared. 4114 // (Presumably this is to prevent it from being trivial?) 4115 if (!HasConstParam && CanHaveConstParam && First) 4116 Diag(MD->getLocation(), 4117 diag::err_defaulted_special_member_copy_non_const_param) 4118 << (CSM == CXXCopyAssignment); 4119 } else if (ExpectedParams) { 4120 // A copy assignment operator can take its argument by value, but a 4121 // defaulted one cannot. 4122 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4123 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4124 HadError = true; 4125 } 4126 4127 // Rebuild the type with the implicit exception specification added. 4128 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4129 Spec.getEPI(EPI); 4130 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4131 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4132 4133 // C++11 [dcl.fct.def.default]p2: 4134 // An explicitly-defaulted function may be declared constexpr only if it 4135 // would have been implicitly declared as constexpr, 4136 // Do not apply this rule to members of class templates, since core issue 1358 4137 // makes such functions always instantiate to constexpr functions. For 4138 // non-constructors, this is checked elsewhere. 4139 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4140 HasConstParam); 4141 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4142 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4143 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4144 // FIXME: Explain why the constructor can't be constexpr. 4145 HadError = true; 4146 } 4147 // and may have an explicit exception-specification only if it is compatible 4148 // with the exception-specification on the implicit declaration. 4149 if (Type->hasExceptionSpec() && 4150 CheckEquivalentExceptionSpec( 4151 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4152 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4153 HadError = true; 4154 4155 // If a function is explicitly defaulted on its first declaration, 4156 if (First) { 4157 // -- it is implicitly considered to be constexpr if the implicit 4158 // definition would be, 4159 MD->setConstexpr(Constexpr); 4160 4161 // -- it is implicitly considered to have the same exception-specification 4162 // as if it had been implicitly declared, 4163 MD->setType(QualType(ImplicitType, 0)); 4164 4165 // Such a function is also trivial if the implicitly-declared function 4166 // would have been. 4167 MD->setTrivial(Trivial); 4168 } 4169 4170 if (ShouldDeleteSpecialMember(MD, CSM)) { 4171 if (First) { 4172 MD->setDeletedAsWritten(); 4173 } else { 4174 // C++11 [dcl.fct.def.default]p4: 4175 // [For a] user-provided explicitly-defaulted function [...] if such a 4176 // function is implicitly defined as deleted, the program is ill-formed. 4177 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4178 HadError = true; 4179 } 4180 } 4181 4182 if (HadError) 4183 MD->setInvalidDecl(); 4184} 4185 4186namespace { 4187struct SpecialMemberDeletionInfo { 4188 Sema &S; 4189 CXXMethodDecl *MD; 4190 Sema::CXXSpecialMember CSM; 4191 bool Diagnose; 4192 4193 // Properties of the special member, computed for convenience. 4194 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4195 SourceLocation Loc; 4196 4197 bool AllFieldsAreConst; 4198 4199 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4200 Sema::CXXSpecialMember CSM, bool Diagnose) 4201 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4202 IsConstructor(false), IsAssignment(false), IsMove(false), 4203 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4204 AllFieldsAreConst(true) { 4205 switch (CSM) { 4206 case Sema::CXXDefaultConstructor: 4207 case Sema::CXXCopyConstructor: 4208 IsConstructor = true; 4209 break; 4210 case Sema::CXXMoveConstructor: 4211 IsConstructor = true; 4212 IsMove = true; 4213 break; 4214 case Sema::CXXCopyAssignment: 4215 IsAssignment = true; 4216 break; 4217 case Sema::CXXMoveAssignment: 4218 IsAssignment = true; 4219 IsMove = true; 4220 break; 4221 case Sema::CXXDestructor: 4222 break; 4223 case Sema::CXXInvalid: 4224 llvm_unreachable("invalid special member kind"); 4225 } 4226 4227 if (MD->getNumParams()) { 4228 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4229 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4230 } 4231 } 4232 4233 bool inUnion() const { return MD->getParent()->isUnion(); } 4234 4235 /// Look up the corresponding special member in the given class. 4236 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class) { 4237 unsigned TQ = MD->getTypeQualifiers(); 4238 return S.LookupSpecialMember(Class, CSM, ConstArg, VolatileArg, 4239 MD->getRefQualifier() == RQ_RValue, 4240 TQ & Qualifiers::Const, 4241 TQ & Qualifiers::Volatile); 4242 } 4243 4244 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4245 4246 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4247 bool shouldDeleteForField(FieldDecl *FD); 4248 bool shouldDeleteForAllConstMembers(); 4249 4250 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj); 4251 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4252 Sema::SpecialMemberOverloadResult *SMOR, 4253 bool IsDtorCallInCtor); 4254 4255 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4256}; 4257} 4258 4259/// Is the given special member inaccessible when used on the given 4260/// sub-object. 4261bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4262 CXXMethodDecl *target) { 4263 /// If we're operating on a base class, the object type is the 4264 /// type of this special member. 4265 QualType objectTy; 4266 AccessSpecifier access = target->getAccess();; 4267 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4268 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4269 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4270 4271 // If we're operating on a field, the object type is the type of the field. 4272 } else { 4273 objectTy = S.Context.getTypeDeclType(target->getParent()); 4274 } 4275 4276 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4277} 4278 4279/// Check whether we should delete a special member due to the implicit 4280/// definition containing a call to a special member of a subobject. 4281bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4282 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4283 bool IsDtorCallInCtor) { 4284 CXXMethodDecl *Decl = SMOR->getMethod(); 4285 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4286 4287 int DiagKind = -1; 4288 4289 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4290 DiagKind = !Decl ? 0 : 1; 4291 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4292 DiagKind = 2; 4293 else if (!isAccessible(Subobj, Decl)) 4294 DiagKind = 3; 4295 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4296 !Decl->isTrivial()) { 4297 // A member of a union must have a trivial corresponding special member. 4298 // As a weird special case, a destructor call from a union's constructor 4299 // must be accessible and non-deleted, but need not be trivial. Such a 4300 // destructor is never actually called, but is semantically checked as 4301 // if it were. 4302 DiagKind = 4; 4303 } 4304 4305 if (DiagKind == -1) 4306 return false; 4307 4308 if (Diagnose) { 4309 if (Field) { 4310 S.Diag(Field->getLocation(), 4311 diag::note_deleted_special_member_class_subobject) 4312 << CSM << MD->getParent() << /*IsField*/true 4313 << Field << DiagKind << IsDtorCallInCtor; 4314 } else { 4315 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4316 S.Diag(Base->getLocStart(), 4317 diag::note_deleted_special_member_class_subobject) 4318 << CSM << MD->getParent() << /*IsField*/false 4319 << Base->getType() << DiagKind << IsDtorCallInCtor; 4320 } 4321 4322 if (DiagKind == 1) 4323 S.NoteDeletedFunction(Decl); 4324 // FIXME: Explain inaccessibility if DiagKind == 3. 4325 } 4326 4327 return true; 4328} 4329 4330/// Check whether we should delete a special member function due to having a 4331/// direct or virtual base class or static data member of class type M. 4332bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4333 CXXRecordDecl *Class, Subobject Subobj) { 4334 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4335 4336 // C++11 [class.ctor]p5: 4337 // -- any direct or virtual base class, or non-static data member with no 4338 // brace-or-equal-initializer, has class type M (or array thereof) and 4339 // either M has no default constructor or overload resolution as applied 4340 // to M's default constructor results in an ambiguity or in a function 4341 // that is deleted or inaccessible 4342 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4343 // -- a direct or virtual base class B that cannot be copied/moved because 4344 // overload resolution, as applied to B's corresponding special member, 4345 // results in an ambiguity or a function that is deleted or inaccessible 4346 // from the defaulted special member 4347 // C++11 [class.dtor]p5: 4348 // -- any direct or virtual base class [...] has a type with a destructor 4349 // that is deleted or inaccessible 4350 if (!(CSM == Sema::CXXDefaultConstructor && 4351 Field && Field->hasInClassInitializer()) && 4352 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class), false)) 4353 return true; 4354 4355 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4356 // -- any direct or virtual base class or non-static data member has a 4357 // type with a destructor that is deleted or inaccessible 4358 if (IsConstructor) { 4359 Sema::SpecialMemberOverloadResult *SMOR = 4360 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4361 false, false, false, false, false); 4362 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4363 return true; 4364 } 4365 4366 return false; 4367} 4368 4369/// Check whether we should delete a special member function due to the class 4370/// having a particular direct or virtual base class. 4371bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4372 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4373 return shouldDeleteForClassSubobject(BaseClass, Base); 4374} 4375 4376/// Check whether we should delete a special member function due to the class 4377/// having a particular non-static data member. 4378bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4379 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4380 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4381 4382 if (CSM == Sema::CXXDefaultConstructor) { 4383 // For a default constructor, all references must be initialized in-class 4384 // and, if a union, it must have a non-const member. 4385 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4386 if (Diagnose) 4387 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4388 << MD->getParent() << FD << FieldType << /*Reference*/0; 4389 return true; 4390 } 4391 // C++11 [class.ctor]p5: any non-variant non-static data member of 4392 // const-qualified type (or array thereof) with no 4393 // brace-or-equal-initializer does not have a user-provided default 4394 // constructor. 4395 if (!inUnion() && FieldType.isConstQualified() && 4396 !FD->hasInClassInitializer() && 4397 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4398 if (Diagnose) 4399 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4400 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4401 return true; 4402 } 4403 4404 if (inUnion() && !FieldType.isConstQualified()) 4405 AllFieldsAreConst = false; 4406 } else if (CSM == Sema::CXXCopyConstructor) { 4407 // For a copy constructor, data members must not be of rvalue reference 4408 // type. 4409 if (FieldType->isRValueReferenceType()) { 4410 if (Diagnose) 4411 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4412 << MD->getParent() << FD << FieldType; 4413 return true; 4414 } 4415 } else if (IsAssignment) { 4416 // For an assignment operator, data members must not be of reference type. 4417 if (FieldType->isReferenceType()) { 4418 if (Diagnose) 4419 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4420 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4421 return true; 4422 } 4423 if (!FieldRecord && FieldType.isConstQualified()) { 4424 // C++11 [class.copy]p23: 4425 // -- a non-static data member of const non-class type (or array thereof) 4426 if (Diagnose) 4427 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4428 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4429 return true; 4430 } 4431 } 4432 4433 if (FieldRecord) { 4434 // Some additional restrictions exist on the variant members. 4435 if (!inUnion() && FieldRecord->isUnion() && 4436 FieldRecord->isAnonymousStructOrUnion()) { 4437 bool AllVariantFieldsAreConst = true; 4438 4439 // FIXME: Handle anonymous unions declared within anonymous unions. 4440 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4441 UE = FieldRecord->field_end(); 4442 UI != UE; ++UI) { 4443 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4444 4445 if (!UnionFieldType.isConstQualified()) 4446 AllVariantFieldsAreConst = false; 4447 4448 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4449 if (UnionFieldRecord && 4450 shouldDeleteForClassSubobject(UnionFieldRecord, *UI)) 4451 return true; 4452 } 4453 4454 // At least one member in each anonymous union must be non-const 4455 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4456 FieldRecord->field_begin() != FieldRecord->field_end()) { 4457 if (Diagnose) 4458 S.Diag(FieldRecord->getLocation(), 4459 diag::note_deleted_default_ctor_all_const) 4460 << MD->getParent() << /*anonymous union*/1; 4461 return true; 4462 } 4463 4464 // Don't check the implicit member of the anonymous union type. 4465 // This is technically non-conformant, but sanity demands it. 4466 return false; 4467 } 4468 4469 if (shouldDeleteForClassSubobject(FieldRecord, FD)) 4470 return true; 4471 } 4472 4473 return false; 4474} 4475 4476/// C++11 [class.ctor] p5: 4477/// A defaulted default constructor for a class X is defined as deleted if 4478/// X is a union and all of its variant members are of const-qualified type. 4479bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4480 // This is a silly definition, because it gives an empty union a deleted 4481 // default constructor. Don't do that. 4482 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4483 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4484 if (Diagnose) 4485 S.Diag(MD->getParent()->getLocation(), 4486 diag::note_deleted_default_ctor_all_const) 4487 << MD->getParent() << /*not anonymous union*/0; 4488 return true; 4489 } 4490 return false; 4491} 4492 4493/// Determine whether a defaulted special member function should be defined as 4494/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4495/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4496bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4497 bool Diagnose) { 4498 assert(!MD->isInvalidDecl()); 4499 CXXRecordDecl *RD = MD->getParent(); 4500 assert(!RD->isDependentType() && "do deletion after instantiation"); 4501 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4502 return false; 4503 4504 // C++11 [expr.lambda.prim]p19: 4505 // The closure type associated with a lambda-expression has a 4506 // deleted (8.4.3) default constructor and a deleted copy 4507 // assignment operator. 4508 if (RD->isLambda() && 4509 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4510 if (Diagnose) 4511 Diag(RD->getLocation(), diag::note_lambda_decl); 4512 return true; 4513 } 4514 4515 // For an anonymous struct or union, the copy and assignment special members 4516 // will never be used, so skip the check. For an anonymous union declared at 4517 // namespace scope, the constructor and destructor are used. 4518 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4519 RD->isAnonymousStructOrUnion()) 4520 return false; 4521 4522 // C++11 [class.copy]p7, p18: 4523 // If the class definition declares a move constructor or move assignment 4524 // operator, an implicitly declared copy constructor or copy assignment 4525 // operator is defined as deleted. 4526 if (MD->isImplicit() && 4527 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4528 CXXMethodDecl *UserDeclaredMove = 0; 4529 4530 // In Microsoft mode, a user-declared move only causes the deletion of the 4531 // corresponding copy operation, not both copy operations. 4532 if (RD->hasUserDeclaredMoveConstructor() && 4533 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4534 if (!Diagnose) return true; 4535 UserDeclaredMove = RD->getMoveConstructor(); 4536 assert(UserDeclaredMove); 4537 } else if (RD->hasUserDeclaredMoveAssignment() && 4538 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4539 if (!Diagnose) return true; 4540 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4541 assert(UserDeclaredMove); 4542 } 4543 4544 if (UserDeclaredMove) { 4545 Diag(UserDeclaredMove->getLocation(), 4546 diag::note_deleted_copy_user_declared_move) 4547 << (CSM == CXXCopyAssignment) << RD 4548 << UserDeclaredMove->isMoveAssignmentOperator(); 4549 return true; 4550 } 4551 } 4552 4553 // Do access control from the special member function 4554 ContextRAII MethodContext(*this, MD); 4555 4556 // C++11 [class.dtor]p5: 4557 // -- for a virtual destructor, lookup of the non-array deallocation function 4558 // results in an ambiguity or in a function that is deleted or inaccessible 4559 if (CSM == CXXDestructor && MD->isVirtual()) { 4560 FunctionDecl *OperatorDelete = 0; 4561 DeclarationName Name = 4562 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4563 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4564 OperatorDelete, false)) { 4565 if (Diagnose) 4566 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4567 return true; 4568 } 4569 } 4570 4571 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4572 4573 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4574 BE = RD->bases_end(); BI != BE; ++BI) 4575 if (!BI->isVirtual() && 4576 SMI.shouldDeleteForBase(BI)) 4577 return true; 4578 4579 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4580 BE = RD->vbases_end(); BI != BE; ++BI) 4581 if (SMI.shouldDeleteForBase(BI)) 4582 return true; 4583 4584 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4585 FE = RD->field_end(); FI != FE; ++FI) 4586 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4587 SMI.shouldDeleteForField(*FI)) 4588 return true; 4589 4590 if (SMI.shouldDeleteForAllConstMembers()) 4591 return true; 4592 4593 return false; 4594} 4595 4596/// \brief Data used with FindHiddenVirtualMethod 4597namespace { 4598 struct FindHiddenVirtualMethodData { 4599 Sema *S; 4600 CXXMethodDecl *Method; 4601 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4602 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4603 }; 4604} 4605 4606/// \brief Member lookup function that determines whether a given C++ 4607/// method overloads virtual methods in a base class without overriding any, 4608/// to be used with CXXRecordDecl::lookupInBases(). 4609static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4610 CXXBasePath &Path, 4611 void *UserData) { 4612 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4613 4614 FindHiddenVirtualMethodData &Data 4615 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4616 4617 DeclarationName Name = Data.Method->getDeclName(); 4618 assert(Name.getNameKind() == DeclarationName::Identifier); 4619 4620 bool foundSameNameMethod = false; 4621 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4622 for (Path.Decls = BaseRecord->lookup(Name); 4623 Path.Decls.first != Path.Decls.second; 4624 ++Path.Decls.first) { 4625 NamedDecl *D = *Path.Decls.first; 4626 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4627 MD = MD->getCanonicalDecl(); 4628 foundSameNameMethod = true; 4629 // Interested only in hidden virtual methods. 4630 if (!MD->isVirtual()) 4631 continue; 4632 // If the method we are checking overrides a method from its base 4633 // don't warn about the other overloaded methods. 4634 if (!Data.S->IsOverload(Data.Method, MD, false)) 4635 return true; 4636 // Collect the overload only if its hidden. 4637 if (!Data.OverridenAndUsingBaseMethods.count(MD)) 4638 overloadedMethods.push_back(MD); 4639 } 4640 } 4641 4642 if (foundSameNameMethod) 4643 Data.OverloadedMethods.append(overloadedMethods.begin(), 4644 overloadedMethods.end()); 4645 return foundSameNameMethod; 4646} 4647 4648/// \brief See if a method overloads virtual methods in a base class without 4649/// overriding any. 4650void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4651 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4652 MD->getLocation()) == DiagnosticsEngine::Ignored) 4653 return; 4654 if (!MD->getDeclName().isIdentifier()) 4655 return; 4656 4657 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4658 /*bool RecordPaths=*/false, 4659 /*bool DetectVirtual=*/false); 4660 FindHiddenVirtualMethodData Data; 4661 Data.Method = MD; 4662 Data.S = this; 4663 4664 // Keep the base methods that were overriden or introduced in the subclass 4665 // by 'using' in a set. A base method not in this set is hidden. 4666 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4667 res.first != res.second; ++res.first) { 4668 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*res.first)) 4669 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4670 E = MD->end_overridden_methods(); 4671 I != E; ++I) 4672 Data.OverridenAndUsingBaseMethods.insert((*I)->getCanonicalDecl()); 4673 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4674 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(shad->getTargetDecl())) 4675 Data.OverridenAndUsingBaseMethods.insert(MD->getCanonicalDecl()); 4676 } 4677 4678 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4679 !Data.OverloadedMethods.empty()) { 4680 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4681 << MD << (Data.OverloadedMethods.size() > 1); 4682 4683 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4684 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4685 Diag(overloadedMD->getLocation(), 4686 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4687 } 4688 } 4689} 4690 4691void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4692 Decl *TagDecl, 4693 SourceLocation LBrac, 4694 SourceLocation RBrac, 4695 AttributeList *AttrList) { 4696 if (!TagDecl) 4697 return; 4698 4699 AdjustDeclIfTemplate(TagDecl); 4700 4701 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4702 // strict aliasing violation! 4703 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4704 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4705 4706 CheckCompletedCXXClass( 4707 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4708} 4709 4710/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4711/// special functions, such as the default constructor, copy 4712/// constructor, or destructor, to the given C++ class (C++ 4713/// [special]p1). This routine can only be executed just before the 4714/// definition of the class is complete. 4715void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4716 if (!ClassDecl->hasUserDeclaredConstructor()) 4717 ++ASTContext::NumImplicitDefaultConstructors; 4718 4719 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4720 ++ASTContext::NumImplicitCopyConstructors; 4721 4722 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4723 ++ASTContext::NumImplicitMoveConstructors; 4724 4725 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4726 ++ASTContext::NumImplicitCopyAssignmentOperators; 4727 4728 // If we have a dynamic class, then the copy assignment operator may be 4729 // virtual, so we have to declare it immediately. This ensures that, e.g., 4730 // it shows up in the right place in the vtable and that we diagnose 4731 // problems with the implicit exception specification. 4732 if (ClassDecl->isDynamicClass()) 4733 DeclareImplicitCopyAssignment(ClassDecl); 4734 } 4735 4736 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4737 ++ASTContext::NumImplicitMoveAssignmentOperators; 4738 4739 // Likewise for the move assignment operator. 4740 if (ClassDecl->isDynamicClass()) 4741 DeclareImplicitMoveAssignment(ClassDecl); 4742 } 4743 4744 if (!ClassDecl->hasUserDeclaredDestructor()) { 4745 ++ASTContext::NumImplicitDestructors; 4746 4747 // If we have a dynamic class, then the destructor may be virtual, so we 4748 // have to declare the destructor immediately. This ensures that, e.g., it 4749 // shows up in the right place in the vtable and that we diagnose problems 4750 // with the implicit exception specification. 4751 if (ClassDecl->isDynamicClass()) 4752 DeclareImplicitDestructor(ClassDecl); 4753 } 4754} 4755 4756void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4757 if (!D) 4758 return; 4759 4760 int NumParamList = D->getNumTemplateParameterLists(); 4761 for (int i = 0; i < NumParamList; i++) { 4762 TemplateParameterList* Params = D->getTemplateParameterList(i); 4763 for (TemplateParameterList::iterator Param = Params->begin(), 4764 ParamEnd = Params->end(); 4765 Param != ParamEnd; ++Param) { 4766 NamedDecl *Named = cast<NamedDecl>(*Param); 4767 if (Named->getDeclName()) { 4768 S->AddDecl(Named); 4769 IdResolver.AddDecl(Named); 4770 } 4771 } 4772 } 4773} 4774 4775void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 4776 if (!D) 4777 return; 4778 4779 TemplateParameterList *Params = 0; 4780 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 4781 Params = Template->getTemplateParameters(); 4782 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 4783 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 4784 Params = PartialSpec->getTemplateParameters(); 4785 else 4786 return; 4787 4788 for (TemplateParameterList::iterator Param = Params->begin(), 4789 ParamEnd = Params->end(); 4790 Param != ParamEnd; ++Param) { 4791 NamedDecl *Named = cast<NamedDecl>(*Param); 4792 if (Named->getDeclName()) { 4793 S->AddDecl(Named); 4794 IdResolver.AddDecl(Named); 4795 } 4796 } 4797} 4798 4799void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4800 if (!RecordD) return; 4801 AdjustDeclIfTemplate(RecordD); 4802 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 4803 PushDeclContext(S, Record); 4804} 4805 4806void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 4807 if (!RecordD) return; 4808 PopDeclContext(); 4809} 4810 4811/// ActOnStartDelayedCXXMethodDeclaration - We have completed 4812/// parsing a top-level (non-nested) C++ class, and we are now 4813/// parsing those parts of the given Method declaration that could 4814/// not be parsed earlier (C++ [class.mem]p2), such as default 4815/// arguments. This action should enter the scope of the given 4816/// Method declaration as if we had just parsed the qualified method 4817/// name. However, it should not bring the parameters into scope; 4818/// that will be performed by ActOnDelayedCXXMethodParameter. 4819void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4820} 4821 4822/// ActOnDelayedCXXMethodParameter - We've already started a delayed 4823/// C++ method declaration. We're (re-)introducing the given 4824/// function parameter into scope for use in parsing later parts of 4825/// the method declaration. For example, we could see an 4826/// ActOnParamDefaultArgument event for this parameter. 4827void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 4828 if (!ParamD) 4829 return; 4830 4831 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 4832 4833 // If this parameter has an unparsed default argument, clear it out 4834 // to make way for the parsed default argument. 4835 if (Param->hasUnparsedDefaultArg()) 4836 Param->setDefaultArg(0); 4837 4838 S->AddDecl(Param); 4839 if (Param->getDeclName()) 4840 IdResolver.AddDecl(Param); 4841} 4842 4843/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 4844/// processing the delayed method declaration for Method. The method 4845/// declaration is now considered finished. There may be a separate 4846/// ActOnStartOfFunctionDef action later (not necessarily 4847/// immediately!) for this method, if it was also defined inside the 4848/// class body. 4849void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 4850 if (!MethodD) 4851 return; 4852 4853 AdjustDeclIfTemplate(MethodD); 4854 4855 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 4856 4857 // Now that we have our default arguments, check the constructor 4858 // again. It could produce additional diagnostics or affect whether 4859 // the class has implicitly-declared destructors, among other 4860 // things. 4861 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 4862 CheckConstructor(Constructor); 4863 4864 // Check the default arguments, which we may have added. 4865 if (!Method->isInvalidDecl()) 4866 CheckCXXDefaultArguments(Method); 4867} 4868 4869/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 4870/// the well-formedness of the constructor declarator @p D with type @p 4871/// R. If there are any errors in the declarator, this routine will 4872/// emit diagnostics and set the invalid bit to true. In any case, the type 4873/// will be updated to reflect a well-formed type for the constructor and 4874/// returned. 4875QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 4876 StorageClass &SC) { 4877 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4878 4879 // C++ [class.ctor]p3: 4880 // A constructor shall not be virtual (10.3) or static (9.4). A 4881 // constructor can be invoked for a const, volatile or const 4882 // volatile object. A constructor shall not be declared const, 4883 // volatile, or const volatile (9.3.2). 4884 if (isVirtual) { 4885 if (!D.isInvalidType()) 4886 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4887 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 4888 << SourceRange(D.getIdentifierLoc()); 4889 D.setInvalidType(); 4890 } 4891 if (SC == SC_Static) { 4892 if (!D.isInvalidType()) 4893 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 4894 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 4895 << SourceRange(D.getIdentifierLoc()); 4896 D.setInvalidType(); 4897 SC = SC_None; 4898 } 4899 4900 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4901 if (FTI.TypeQuals != 0) { 4902 if (FTI.TypeQuals & Qualifiers::Const) 4903 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4904 << "const" << SourceRange(D.getIdentifierLoc()); 4905 if (FTI.TypeQuals & Qualifiers::Volatile) 4906 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4907 << "volatile" << SourceRange(D.getIdentifierLoc()); 4908 if (FTI.TypeQuals & Qualifiers::Restrict) 4909 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 4910 << "restrict" << SourceRange(D.getIdentifierLoc()); 4911 D.setInvalidType(); 4912 } 4913 4914 // C++0x [class.ctor]p4: 4915 // A constructor shall not be declared with a ref-qualifier. 4916 if (FTI.hasRefQualifier()) { 4917 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 4918 << FTI.RefQualifierIsLValueRef 4919 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 4920 D.setInvalidType(); 4921 } 4922 4923 // Rebuild the function type "R" without any type qualifiers (in 4924 // case any of the errors above fired) and with "void" as the 4925 // return type, since constructors don't have return types. 4926 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 4927 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 4928 return R; 4929 4930 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 4931 EPI.TypeQuals = 0; 4932 EPI.RefQualifier = RQ_None; 4933 4934 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 4935 Proto->getNumArgs(), EPI); 4936} 4937 4938/// CheckConstructor - Checks a fully-formed constructor for 4939/// well-formedness, issuing any diagnostics required. Returns true if 4940/// the constructor declarator is invalid. 4941void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 4942 CXXRecordDecl *ClassDecl 4943 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 4944 if (!ClassDecl) 4945 return Constructor->setInvalidDecl(); 4946 4947 // C++ [class.copy]p3: 4948 // A declaration of a constructor for a class X is ill-formed if 4949 // its first parameter is of type (optionally cv-qualified) X and 4950 // either there are no other parameters or else all other 4951 // parameters have default arguments. 4952 if (!Constructor->isInvalidDecl() && 4953 ((Constructor->getNumParams() == 1) || 4954 (Constructor->getNumParams() > 1 && 4955 Constructor->getParamDecl(1)->hasDefaultArg())) && 4956 Constructor->getTemplateSpecializationKind() 4957 != TSK_ImplicitInstantiation) { 4958 QualType ParamType = Constructor->getParamDecl(0)->getType(); 4959 QualType ClassTy = Context.getTagDeclType(ClassDecl); 4960 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 4961 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 4962 const char *ConstRef 4963 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 4964 : " const &"; 4965 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 4966 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 4967 4968 // FIXME: Rather that making the constructor invalid, we should endeavor 4969 // to fix the type. 4970 Constructor->setInvalidDecl(); 4971 } 4972 } 4973} 4974 4975/// CheckDestructor - Checks a fully-formed destructor definition for 4976/// well-formedness, issuing any diagnostics required. Returns true 4977/// on error. 4978bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 4979 CXXRecordDecl *RD = Destructor->getParent(); 4980 4981 if (Destructor->isVirtual()) { 4982 SourceLocation Loc; 4983 4984 if (!Destructor->isImplicit()) 4985 Loc = Destructor->getLocation(); 4986 else 4987 Loc = RD->getLocation(); 4988 4989 // If we have a virtual destructor, look up the deallocation function 4990 FunctionDecl *OperatorDelete = 0; 4991 DeclarationName Name = 4992 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4993 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 4994 return true; 4995 4996 MarkFunctionReferenced(Loc, OperatorDelete); 4997 4998 Destructor->setOperatorDelete(OperatorDelete); 4999 } 5000 5001 return false; 5002} 5003 5004static inline bool 5005FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5006 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5007 FTI.ArgInfo[0].Param && 5008 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5009} 5010 5011/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5012/// the well-formednes of the destructor declarator @p D with type @p 5013/// R. If there are any errors in the declarator, this routine will 5014/// emit diagnostics and set the declarator to invalid. Even if this happens, 5015/// will be updated to reflect a well-formed type for the destructor and 5016/// returned. 5017QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5018 StorageClass& SC) { 5019 // C++ [class.dtor]p1: 5020 // [...] A typedef-name that names a class is a class-name 5021 // (7.1.3); however, a typedef-name that names a class shall not 5022 // be used as the identifier in the declarator for a destructor 5023 // declaration. 5024 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5025 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5026 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5027 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5028 else if (const TemplateSpecializationType *TST = 5029 DeclaratorType->getAs<TemplateSpecializationType>()) 5030 if (TST->isTypeAlias()) 5031 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5032 << DeclaratorType << 1; 5033 5034 // C++ [class.dtor]p2: 5035 // A destructor is used to destroy objects of its class type. A 5036 // destructor takes no parameters, and no return type can be 5037 // specified for it (not even void). The address of a destructor 5038 // shall not be taken. A destructor shall not be static. A 5039 // destructor can be invoked for a const, volatile or const 5040 // volatile object. A destructor shall not be declared const, 5041 // volatile or const volatile (9.3.2). 5042 if (SC == SC_Static) { 5043 if (!D.isInvalidType()) 5044 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5045 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5046 << SourceRange(D.getIdentifierLoc()) 5047 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5048 5049 SC = SC_None; 5050 } 5051 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5052 // Destructors don't have return types, but the parser will 5053 // happily parse something like: 5054 // 5055 // class X { 5056 // float ~X(); 5057 // }; 5058 // 5059 // The return type will be eliminated later. 5060 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5061 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5062 << SourceRange(D.getIdentifierLoc()); 5063 } 5064 5065 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5066 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5067 if (FTI.TypeQuals & Qualifiers::Const) 5068 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5069 << "const" << SourceRange(D.getIdentifierLoc()); 5070 if (FTI.TypeQuals & Qualifiers::Volatile) 5071 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5072 << "volatile" << SourceRange(D.getIdentifierLoc()); 5073 if (FTI.TypeQuals & Qualifiers::Restrict) 5074 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5075 << "restrict" << SourceRange(D.getIdentifierLoc()); 5076 D.setInvalidType(); 5077 } 5078 5079 // C++0x [class.dtor]p2: 5080 // A destructor shall not be declared with a ref-qualifier. 5081 if (FTI.hasRefQualifier()) { 5082 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5083 << FTI.RefQualifierIsLValueRef 5084 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5085 D.setInvalidType(); 5086 } 5087 5088 // Make sure we don't have any parameters. 5089 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5090 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5091 5092 // Delete the parameters. 5093 FTI.freeArgs(); 5094 D.setInvalidType(); 5095 } 5096 5097 // Make sure the destructor isn't variadic. 5098 if (FTI.isVariadic) { 5099 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5100 D.setInvalidType(); 5101 } 5102 5103 // Rebuild the function type "R" without any type qualifiers or 5104 // parameters (in case any of the errors above fired) and with 5105 // "void" as the return type, since destructors don't have return 5106 // types. 5107 if (!D.isInvalidType()) 5108 return R; 5109 5110 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5111 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5112 EPI.Variadic = false; 5113 EPI.TypeQuals = 0; 5114 EPI.RefQualifier = RQ_None; 5115 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5116} 5117 5118/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5119/// well-formednes of the conversion function declarator @p D with 5120/// type @p R. If there are any errors in the declarator, this routine 5121/// will emit diagnostics and return true. Otherwise, it will return 5122/// false. Either way, the type @p R will be updated to reflect a 5123/// well-formed type for the conversion operator. 5124void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5125 StorageClass& SC) { 5126 // C++ [class.conv.fct]p1: 5127 // Neither parameter types nor return type can be specified. The 5128 // type of a conversion function (8.3.5) is "function taking no 5129 // parameter returning conversion-type-id." 5130 if (SC == SC_Static) { 5131 if (!D.isInvalidType()) 5132 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5133 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5134 << SourceRange(D.getIdentifierLoc()); 5135 D.setInvalidType(); 5136 SC = SC_None; 5137 } 5138 5139 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5140 5141 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5142 // Conversion functions don't have return types, but the parser will 5143 // happily parse something like: 5144 // 5145 // class X { 5146 // float operator bool(); 5147 // }; 5148 // 5149 // The return type will be changed later anyway. 5150 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5151 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5152 << SourceRange(D.getIdentifierLoc()); 5153 D.setInvalidType(); 5154 } 5155 5156 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5157 5158 // Make sure we don't have any parameters. 5159 if (Proto->getNumArgs() > 0) { 5160 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5161 5162 // Delete the parameters. 5163 D.getFunctionTypeInfo().freeArgs(); 5164 D.setInvalidType(); 5165 } else if (Proto->isVariadic()) { 5166 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5167 D.setInvalidType(); 5168 } 5169 5170 // Diagnose "&operator bool()" and other such nonsense. This 5171 // is actually a gcc extension which we don't support. 5172 if (Proto->getResultType() != ConvType) { 5173 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5174 << Proto->getResultType(); 5175 D.setInvalidType(); 5176 ConvType = Proto->getResultType(); 5177 } 5178 5179 // C++ [class.conv.fct]p4: 5180 // The conversion-type-id shall not represent a function type nor 5181 // an array type. 5182 if (ConvType->isArrayType()) { 5183 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5184 ConvType = Context.getPointerType(ConvType); 5185 D.setInvalidType(); 5186 } else if (ConvType->isFunctionType()) { 5187 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5188 ConvType = Context.getPointerType(ConvType); 5189 D.setInvalidType(); 5190 } 5191 5192 // Rebuild the function type "R" without any parameters (in case any 5193 // of the errors above fired) and with the conversion type as the 5194 // return type. 5195 if (D.isInvalidType()) 5196 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5197 5198 // C++0x explicit conversion operators. 5199 if (D.getDeclSpec().isExplicitSpecified()) 5200 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5201 getLangOpts().CPlusPlus0x ? 5202 diag::warn_cxx98_compat_explicit_conversion_functions : 5203 diag::ext_explicit_conversion_functions) 5204 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5205} 5206 5207/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5208/// the declaration of the given C++ conversion function. This routine 5209/// is responsible for recording the conversion function in the C++ 5210/// class, if possible. 5211Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5212 assert(Conversion && "Expected to receive a conversion function declaration"); 5213 5214 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5215 5216 // Make sure we aren't redeclaring the conversion function. 5217 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5218 5219 // C++ [class.conv.fct]p1: 5220 // [...] A conversion function is never used to convert a 5221 // (possibly cv-qualified) object to the (possibly cv-qualified) 5222 // same object type (or a reference to it), to a (possibly 5223 // cv-qualified) base class of that type (or a reference to it), 5224 // or to (possibly cv-qualified) void. 5225 // FIXME: Suppress this warning if the conversion function ends up being a 5226 // virtual function that overrides a virtual function in a base class. 5227 QualType ClassType 5228 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5229 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5230 ConvType = ConvTypeRef->getPointeeType(); 5231 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5232 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5233 /* Suppress diagnostics for instantiations. */; 5234 else if (ConvType->isRecordType()) { 5235 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5236 if (ConvType == ClassType) 5237 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5238 << ClassType; 5239 else if (IsDerivedFrom(ClassType, ConvType)) 5240 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5241 << ClassType << ConvType; 5242 } else if (ConvType->isVoidType()) { 5243 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5244 << ClassType << ConvType; 5245 } 5246 5247 if (FunctionTemplateDecl *ConversionTemplate 5248 = Conversion->getDescribedFunctionTemplate()) 5249 return ConversionTemplate; 5250 5251 return Conversion; 5252} 5253 5254//===----------------------------------------------------------------------===// 5255// Namespace Handling 5256//===----------------------------------------------------------------------===// 5257 5258 5259 5260/// ActOnStartNamespaceDef - This is called at the start of a namespace 5261/// definition. 5262Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5263 SourceLocation InlineLoc, 5264 SourceLocation NamespaceLoc, 5265 SourceLocation IdentLoc, 5266 IdentifierInfo *II, 5267 SourceLocation LBrace, 5268 AttributeList *AttrList) { 5269 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5270 // For anonymous namespace, take the location of the left brace. 5271 SourceLocation Loc = II ? IdentLoc : LBrace; 5272 bool IsInline = InlineLoc.isValid(); 5273 bool IsInvalid = false; 5274 bool IsStd = false; 5275 bool AddToKnown = false; 5276 Scope *DeclRegionScope = NamespcScope->getParent(); 5277 5278 NamespaceDecl *PrevNS = 0; 5279 if (II) { 5280 // C++ [namespace.def]p2: 5281 // The identifier in an original-namespace-definition shall not 5282 // have been previously defined in the declarative region in 5283 // which the original-namespace-definition appears. The 5284 // identifier in an original-namespace-definition is the name of 5285 // the namespace. Subsequently in that declarative region, it is 5286 // treated as an original-namespace-name. 5287 // 5288 // Since namespace names are unique in their scope, and we don't 5289 // look through using directives, just look for any ordinary names. 5290 5291 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5292 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5293 Decl::IDNS_Namespace; 5294 NamedDecl *PrevDecl = 0; 5295 for (DeclContext::lookup_result R 5296 = CurContext->getRedeclContext()->lookup(II); 5297 R.first != R.second; ++R.first) { 5298 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5299 PrevDecl = *R.first; 5300 break; 5301 } 5302 } 5303 5304 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5305 5306 if (PrevNS) { 5307 // This is an extended namespace definition. 5308 if (IsInline != PrevNS->isInline()) { 5309 // inline-ness must match 5310 if (PrevNS->isInline()) { 5311 // The user probably just forgot the 'inline', so suggest that it 5312 // be added back. 5313 Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5314 << FixItHint::CreateInsertion(NamespaceLoc, "inline "); 5315 } else { 5316 Diag(Loc, diag::err_inline_namespace_mismatch) 5317 << IsInline; 5318 } 5319 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5320 5321 IsInline = PrevNS->isInline(); 5322 } 5323 } else if (PrevDecl) { 5324 // This is an invalid name redefinition. 5325 Diag(Loc, diag::err_redefinition_different_kind) 5326 << II; 5327 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5328 IsInvalid = true; 5329 // Continue on to push Namespc as current DeclContext and return it. 5330 } else if (II->isStr("std") && 5331 CurContext->getRedeclContext()->isTranslationUnit()) { 5332 // This is the first "real" definition of the namespace "std", so update 5333 // our cache of the "std" namespace to point at this definition. 5334 PrevNS = getStdNamespace(); 5335 IsStd = true; 5336 AddToKnown = !IsInline; 5337 } else { 5338 // We've seen this namespace for the first time. 5339 AddToKnown = !IsInline; 5340 } 5341 } else { 5342 // Anonymous namespaces. 5343 5344 // Determine whether the parent already has an anonymous namespace. 5345 DeclContext *Parent = CurContext->getRedeclContext(); 5346 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5347 PrevNS = TU->getAnonymousNamespace(); 5348 } else { 5349 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5350 PrevNS = ND->getAnonymousNamespace(); 5351 } 5352 5353 if (PrevNS && IsInline != PrevNS->isInline()) { 5354 // inline-ness must match 5355 Diag(Loc, diag::err_inline_namespace_mismatch) 5356 << IsInline; 5357 Diag(PrevNS->getLocation(), diag::note_previous_definition); 5358 5359 // Recover by ignoring the new namespace's inline status. 5360 IsInline = PrevNS->isInline(); 5361 } 5362 } 5363 5364 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5365 StartLoc, Loc, II, PrevNS); 5366 if (IsInvalid) 5367 Namespc->setInvalidDecl(); 5368 5369 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5370 5371 // FIXME: Should we be merging attributes? 5372 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5373 PushNamespaceVisibilityAttr(Attr, Loc); 5374 5375 if (IsStd) 5376 StdNamespace = Namespc; 5377 if (AddToKnown) 5378 KnownNamespaces[Namespc] = false; 5379 5380 if (II) { 5381 PushOnScopeChains(Namespc, DeclRegionScope); 5382 } else { 5383 // Link the anonymous namespace into its parent. 5384 DeclContext *Parent = CurContext->getRedeclContext(); 5385 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5386 TU->setAnonymousNamespace(Namespc); 5387 } else { 5388 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5389 } 5390 5391 CurContext->addDecl(Namespc); 5392 5393 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5394 // behaves as if it were replaced by 5395 // namespace unique { /* empty body */ } 5396 // using namespace unique; 5397 // namespace unique { namespace-body } 5398 // where all occurrences of 'unique' in a translation unit are 5399 // replaced by the same identifier and this identifier differs 5400 // from all other identifiers in the entire program. 5401 5402 // We just create the namespace with an empty name and then add an 5403 // implicit using declaration, just like the standard suggests. 5404 // 5405 // CodeGen enforces the "universally unique" aspect by giving all 5406 // declarations semantically contained within an anonymous 5407 // namespace internal linkage. 5408 5409 if (!PrevNS) { 5410 UsingDirectiveDecl* UD 5411 = UsingDirectiveDecl::Create(Context, CurContext, 5412 /* 'using' */ LBrace, 5413 /* 'namespace' */ SourceLocation(), 5414 /* qualifier */ NestedNameSpecifierLoc(), 5415 /* identifier */ SourceLocation(), 5416 Namespc, 5417 /* Ancestor */ CurContext); 5418 UD->setImplicit(); 5419 CurContext->addDecl(UD); 5420 } 5421 } 5422 5423 // Although we could have an invalid decl (i.e. the namespace name is a 5424 // redefinition), push it as current DeclContext and try to continue parsing. 5425 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5426 // for the namespace has the declarations that showed up in that particular 5427 // namespace definition. 5428 PushDeclContext(NamespcScope, Namespc); 5429 return Namespc; 5430} 5431 5432/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5433/// is a namespace alias, returns the namespace it points to. 5434static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5435 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5436 return AD->getNamespace(); 5437 return dyn_cast_or_null<NamespaceDecl>(D); 5438} 5439 5440/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5441/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5442void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5443 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5444 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5445 Namespc->setRBraceLoc(RBrace); 5446 PopDeclContext(); 5447 if (Namespc->hasAttr<VisibilityAttr>()) 5448 PopPragmaVisibility(true, RBrace); 5449} 5450 5451CXXRecordDecl *Sema::getStdBadAlloc() const { 5452 return cast_or_null<CXXRecordDecl>( 5453 StdBadAlloc.get(Context.getExternalSource())); 5454} 5455 5456NamespaceDecl *Sema::getStdNamespace() const { 5457 return cast_or_null<NamespaceDecl>( 5458 StdNamespace.get(Context.getExternalSource())); 5459} 5460 5461/// \brief Retrieve the special "std" namespace, which may require us to 5462/// implicitly define the namespace. 5463NamespaceDecl *Sema::getOrCreateStdNamespace() { 5464 if (!StdNamespace) { 5465 // The "std" namespace has not yet been defined, so build one implicitly. 5466 StdNamespace = NamespaceDecl::Create(Context, 5467 Context.getTranslationUnitDecl(), 5468 /*Inline=*/false, 5469 SourceLocation(), SourceLocation(), 5470 &PP.getIdentifierTable().get("std"), 5471 /*PrevDecl=*/0); 5472 getStdNamespace()->setImplicit(true); 5473 } 5474 5475 return getStdNamespace(); 5476} 5477 5478bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5479 assert(getLangOpts().CPlusPlus && 5480 "Looking for std::initializer_list outside of C++."); 5481 5482 // We're looking for implicit instantiations of 5483 // template <typename E> class std::initializer_list. 5484 5485 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5486 return false; 5487 5488 ClassTemplateDecl *Template = 0; 5489 const TemplateArgument *Arguments = 0; 5490 5491 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5492 5493 ClassTemplateSpecializationDecl *Specialization = 5494 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5495 if (!Specialization) 5496 return false; 5497 5498 Template = Specialization->getSpecializedTemplate(); 5499 Arguments = Specialization->getTemplateArgs().data(); 5500 } else if (const TemplateSpecializationType *TST = 5501 Ty->getAs<TemplateSpecializationType>()) { 5502 Template = dyn_cast_or_null<ClassTemplateDecl>( 5503 TST->getTemplateName().getAsTemplateDecl()); 5504 Arguments = TST->getArgs(); 5505 } 5506 if (!Template) 5507 return false; 5508 5509 if (!StdInitializerList) { 5510 // Haven't recognized std::initializer_list yet, maybe this is it. 5511 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5512 if (TemplateClass->getIdentifier() != 5513 &PP.getIdentifierTable().get("initializer_list") || 5514 !getStdNamespace()->InEnclosingNamespaceSetOf( 5515 TemplateClass->getDeclContext())) 5516 return false; 5517 // This is a template called std::initializer_list, but is it the right 5518 // template? 5519 TemplateParameterList *Params = Template->getTemplateParameters(); 5520 if (Params->getMinRequiredArguments() != 1) 5521 return false; 5522 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5523 return false; 5524 5525 // It's the right template. 5526 StdInitializerList = Template; 5527 } 5528 5529 if (Template != StdInitializerList) 5530 return false; 5531 5532 // This is an instance of std::initializer_list. Find the argument type. 5533 if (Element) 5534 *Element = Arguments[0].getAsType(); 5535 return true; 5536} 5537 5538static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5539 NamespaceDecl *Std = S.getStdNamespace(); 5540 if (!Std) { 5541 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5542 return 0; 5543 } 5544 5545 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5546 Loc, Sema::LookupOrdinaryName); 5547 if (!S.LookupQualifiedName(Result, Std)) { 5548 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5549 return 0; 5550 } 5551 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5552 if (!Template) { 5553 Result.suppressDiagnostics(); 5554 // We found something weird. Complain about the first thing we found. 5555 NamedDecl *Found = *Result.begin(); 5556 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5557 return 0; 5558 } 5559 5560 // We found some template called std::initializer_list. Now verify that it's 5561 // correct. 5562 TemplateParameterList *Params = Template->getTemplateParameters(); 5563 if (Params->getMinRequiredArguments() != 1 || 5564 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5565 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5566 return 0; 5567 } 5568 5569 return Template; 5570} 5571 5572QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5573 if (!StdInitializerList) { 5574 StdInitializerList = LookupStdInitializerList(*this, Loc); 5575 if (!StdInitializerList) 5576 return QualType(); 5577 } 5578 5579 TemplateArgumentListInfo Args(Loc, Loc); 5580 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5581 Context.getTrivialTypeSourceInfo(Element, 5582 Loc))); 5583 return Context.getCanonicalType( 5584 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5585} 5586 5587bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5588 // C++ [dcl.init.list]p2: 5589 // A constructor is an initializer-list constructor if its first parameter 5590 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5591 // std::initializer_list<E> for some type E, and either there are no other 5592 // parameters or else all other parameters have default arguments. 5593 if (Ctor->getNumParams() < 1 || 5594 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5595 return false; 5596 5597 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5598 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5599 ArgType = RT->getPointeeType().getUnqualifiedType(); 5600 5601 return isStdInitializerList(ArgType, 0); 5602} 5603 5604/// \brief Determine whether a using statement is in a context where it will be 5605/// apply in all contexts. 5606static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5607 switch (CurContext->getDeclKind()) { 5608 case Decl::TranslationUnit: 5609 return true; 5610 case Decl::LinkageSpec: 5611 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5612 default: 5613 return false; 5614 } 5615} 5616 5617namespace { 5618 5619// Callback to only accept typo corrections that are namespaces. 5620class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5621 public: 5622 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5623 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5624 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5625 } 5626 return false; 5627 } 5628}; 5629 5630} 5631 5632static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5633 CXXScopeSpec &SS, 5634 SourceLocation IdentLoc, 5635 IdentifierInfo *Ident) { 5636 NamespaceValidatorCCC Validator; 5637 R.clear(); 5638 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5639 R.getLookupKind(), Sc, &SS, 5640 Validator)) { 5641 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5642 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5643 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5644 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5645 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5646 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5647 else 5648 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5649 << Ident << CorrectedQuotedStr 5650 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5651 5652 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5653 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5654 5655 R.addDecl(Corrected.getCorrectionDecl()); 5656 return true; 5657 } 5658 return false; 5659} 5660 5661Decl *Sema::ActOnUsingDirective(Scope *S, 5662 SourceLocation UsingLoc, 5663 SourceLocation NamespcLoc, 5664 CXXScopeSpec &SS, 5665 SourceLocation IdentLoc, 5666 IdentifierInfo *NamespcName, 5667 AttributeList *AttrList) { 5668 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5669 assert(NamespcName && "Invalid NamespcName."); 5670 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5671 5672 // This can only happen along a recovery path. 5673 while (S->getFlags() & Scope::TemplateParamScope) 5674 S = S->getParent(); 5675 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5676 5677 UsingDirectiveDecl *UDir = 0; 5678 NestedNameSpecifier *Qualifier = 0; 5679 if (SS.isSet()) 5680 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5681 5682 // Lookup namespace name. 5683 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5684 LookupParsedName(R, S, &SS); 5685 if (R.isAmbiguous()) 5686 return 0; 5687 5688 if (R.empty()) { 5689 R.clear(); 5690 // Allow "using namespace std;" or "using namespace ::std;" even if 5691 // "std" hasn't been defined yet, for GCC compatibility. 5692 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5693 NamespcName->isStr("std")) { 5694 Diag(IdentLoc, diag::ext_using_undefined_std); 5695 R.addDecl(getOrCreateStdNamespace()); 5696 R.resolveKind(); 5697 } 5698 // Otherwise, attempt typo correction. 5699 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5700 } 5701 5702 if (!R.empty()) { 5703 NamedDecl *Named = R.getFoundDecl(); 5704 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5705 && "expected namespace decl"); 5706 // C++ [namespace.udir]p1: 5707 // A using-directive specifies that the names in the nominated 5708 // namespace can be used in the scope in which the 5709 // using-directive appears after the using-directive. During 5710 // unqualified name lookup (3.4.1), the names appear as if they 5711 // were declared in the nearest enclosing namespace which 5712 // contains both the using-directive and the nominated 5713 // namespace. [Note: in this context, "contains" means "contains 5714 // directly or indirectly". ] 5715 5716 // Find enclosing context containing both using-directive and 5717 // nominated namespace. 5718 NamespaceDecl *NS = getNamespaceDecl(Named); 5719 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5720 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5721 CommonAncestor = CommonAncestor->getParent(); 5722 5723 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5724 SS.getWithLocInContext(Context), 5725 IdentLoc, Named, CommonAncestor); 5726 5727 if (IsUsingDirectiveInToplevelContext(CurContext) && 5728 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5729 Diag(IdentLoc, diag::warn_using_directive_in_header); 5730 } 5731 5732 PushUsingDirective(S, UDir); 5733 } else { 5734 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5735 } 5736 5737 // FIXME: We ignore attributes for now. 5738 return UDir; 5739} 5740 5741void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 5742 // If the scope has an associated entity and the using directive is at 5743 // namespace or translation unit scope, add the UsingDirectiveDecl into 5744 // its lookup structure so qualified name lookup can find it. 5745 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 5746 if (Ctx && !Ctx->isFunctionOrMethod()) 5747 Ctx->addDecl(UDir); 5748 else 5749 // Otherwise, it is at block sope. The using-directives will affect lookup 5750 // only to the end of the scope. 5751 S->PushUsingDirective(UDir); 5752} 5753 5754 5755Decl *Sema::ActOnUsingDeclaration(Scope *S, 5756 AccessSpecifier AS, 5757 bool HasUsingKeyword, 5758 SourceLocation UsingLoc, 5759 CXXScopeSpec &SS, 5760 UnqualifiedId &Name, 5761 AttributeList *AttrList, 5762 bool IsTypeName, 5763 SourceLocation TypenameLoc) { 5764 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5765 5766 switch (Name.getKind()) { 5767 case UnqualifiedId::IK_ImplicitSelfParam: 5768 case UnqualifiedId::IK_Identifier: 5769 case UnqualifiedId::IK_OperatorFunctionId: 5770 case UnqualifiedId::IK_LiteralOperatorId: 5771 case UnqualifiedId::IK_ConversionFunctionId: 5772 break; 5773 5774 case UnqualifiedId::IK_ConstructorName: 5775 case UnqualifiedId::IK_ConstructorTemplateId: 5776 // C++11 inheriting constructors. 5777 Diag(Name.getLocStart(), 5778 getLangOpts().CPlusPlus0x ? 5779 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 5780 // instead once inheriting constructors work. 5781 diag::err_using_decl_constructor_unsupported : 5782 diag::err_using_decl_constructor) 5783 << SS.getRange(); 5784 5785 if (getLangOpts().CPlusPlus0x) break; 5786 5787 return 0; 5788 5789 case UnqualifiedId::IK_DestructorName: 5790 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 5791 << SS.getRange(); 5792 return 0; 5793 5794 case UnqualifiedId::IK_TemplateId: 5795 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 5796 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 5797 return 0; 5798 } 5799 5800 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 5801 DeclarationName TargetName = TargetNameInfo.getName(); 5802 if (!TargetName) 5803 return 0; 5804 5805 // Warn about using declarations. 5806 // TODO: store that the declaration was written without 'using' and 5807 // talk about access decls instead of using decls in the 5808 // diagnostics. 5809 if (!HasUsingKeyword) { 5810 UsingLoc = Name.getLocStart(); 5811 5812 Diag(UsingLoc, diag::warn_access_decl_deprecated) 5813 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 5814 } 5815 5816 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 5817 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 5818 return 0; 5819 5820 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 5821 TargetNameInfo, AttrList, 5822 /* IsInstantiation */ false, 5823 IsTypeName, TypenameLoc); 5824 if (UD) 5825 PushOnScopeChains(UD, S, /*AddToContext*/ false); 5826 5827 return UD; 5828} 5829 5830/// \brief Determine whether a using declaration considers the given 5831/// declarations as "equivalent", e.g., if they are redeclarations of 5832/// the same entity or are both typedefs of the same type. 5833static bool 5834IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 5835 bool &SuppressRedeclaration) { 5836 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 5837 SuppressRedeclaration = false; 5838 return true; 5839 } 5840 5841 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 5842 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 5843 SuppressRedeclaration = true; 5844 return Context.hasSameType(TD1->getUnderlyingType(), 5845 TD2->getUnderlyingType()); 5846 } 5847 5848 return false; 5849} 5850 5851 5852/// Determines whether to create a using shadow decl for a particular 5853/// decl, given the set of decls existing prior to this using lookup. 5854bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 5855 const LookupResult &Previous) { 5856 // Diagnose finding a decl which is not from a base class of the 5857 // current class. We do this now because there are cases where this 5858 // function will silently decide not to build a shadow decl, which 5859 // will pre-empt further diagnostics. 5860 // 5861 // We don't need to do this in C++0x because we do the check once on 5862 // the qualifier. 5863 // 5864 // FIXME: diagnose the following if we care enough: 5865 // struct A { int foo; }; 5866 // struct B : A { using A::foo; }; 5867 // template <class T> struct C : A {}; 5868 // template <class T> struct D : C<T> { using B::foo; } // <--- 5869 // This is invalid (during instantiation) in C++03 because B::foo 5870 // resolves to the using decl in B, which is not a base class of D<T>. 5871 // We can't diagnose it immediately because C<T> is an unknown 5872 // specialization. The UsingShadowDecl in D<T> then points directly 5873 // to A::foo, which will look well-formed when we instantiate. 5874 // The right solution is to not collapse the shadow-decl chain. 5875 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 5876 DeclContext *OrigDC = Orig->getDeclContext(); 5877 5878 // Handle enums and anonymous structs. 5879 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 5880 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 5881 while (OrigRec->isAnonymousStructOrUnion()) 5882 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 5883 5884 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 5885 if (OrigDC == CurContext) { 5886 Diag(Using->getLocation(), 5887 diag::err_using_decl_nested_name_specifier_is_current_class) 5888 << Using->getQualifierLoc().getSourceRange(); 5889 Diag(Orig->getLocation(), diag::note_using_decl_target); 5890 return true; 5891 } 5892 5893 Diag(Using->getQualifierLoc().getBeginLoc(), 5894 diag::err_using_decl_nested_name_specifier_is_not_base_class) 5895 << Using->getQualifier() 5896 << cast<CXXRecordDecl>(CurContext) 5897 << Using->getQualifierLoc().getSourceRange(); 5898 Diag(Orig->getLocation(), diag::note_using_decl_target); 5899 return true; 5900 } 5901 } 5902 5903 if (Previous.empty()) return false; 5904 5905 NamedDecl *Target = Orig; 5906 if (isa<UsingShadowDecl>(Target)) 5907 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5908 5909 // If the target happens to be one of the previous declarations, we 5910 // don't have a conflict. 5911 // 5912 // FIXME: but we might be increasing its access, in which case we 5913 // should redeclare it. 5914 NamedDecl *NonTag = 0, *Tag = 0; 5915 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 5916 I != E; ++I) { 5917 NamedDecl *D = (*I)->getUnderlyingDecl(); 5918 bool Result; 5919 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 5920 return Result; 5921 5922 (isa<TagDecl>(D) ? Tag : NonTag) = D; 5923 } 5924 5925 if (Target->isFunctionOrFunctionTemplate()) { 5926 FunctionDecl *FD; 5927 if (isa<FunctionTemplateDecl>(Target)) 5928 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 5929 else 5930 FD = cast<FunctionDecl>(Target); 5931 5932 NamedDecl *OldDecl = 0; 5933 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 5934 case Ovl_Overload: 5935 return false; 5936 5937 case Ovl_NonFunction: 5938 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5939 break; 5940 5941 // We found a decl with the exact signature. 5942 case Ovl_Match: 5943 // If we're in a record, we want to hide the target, so we 5944 // return true (without a diagnostic) to tell the caller not to 5945 // build a shadow decl. 5946 if (CurContext->isRecord()) 5947 return true; 5948 5949 // If we're not in a record, this is an error. 5950 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5951 break; 5952 } 5953 5954 Diag(Target->getLocation(), diag::note_using_decl_target); 5955 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 5956 return true; 5957 } 5958 5959 // Target is not a function. 5960 5961 if (isa<TagDecl>(Target)) { 5962 // No conflict between a tag and a non-tag. 5963 if (!Tag) return false; 5964 5965 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5966 Diag(Target->getLocation(), diag::note_using_decl_target); 5967 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 5968 return true; 5969 } 5970 5971 // No conflict between a tag and a non-tag. 5972 if (!NonTag) return false; 5973 5974 Diag(Using->getLocation(), diag::err_using_decl_conflict); 5975 Diag(Target->getLocation(), diag::note_using_decl_target); 5976 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 5977 return true; 5978} 5979 5980/// Builds a shadow declaration corresponding to a 'using' declaration. 5981UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 5982 UsingDecl *UD, 5983 NamedDecl *Orig) { 5984 5985 // If we resolved to another shadow declaration, just coalesce them. 5986 NamedDecl *Target = Orig; 5987 if (isa<UsingShadowDecl>(Target)) { 5988 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 5989 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 5990 } 5991 5992 UsingShadowDecl *Shadow 5993 = UsingShadowDecl::Create(Context, CurContext, 5994 UD->getLocation(), UD, Target); 5995 UD->addShadowDecl(Shadow); 5996 5997 Shadow->setAccess(UD->getAccess()); 5998 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 5999 Shadow->setInvalidDecl(); 6000 6001 if (S) 6002 PushOnScopeChains(Shadow, S); 6003 else 6004 CurContext->addDecl(Shadow); 6005 6006 6007 return Shadow; 6008} 6009 6010/// Hides a using shadow declaration. This is required by the current 6011/// using-decl implementation when a resolvable using declaration in a 6012/// class is followed by a declaration which would hide or override 6013/// one or more of the using decl's targets; for example: 6014/// 6015/// struct Base { void foo(int); }; 6016/// struct Derived : Base { 6017/// using Base::foo; 6018/// void foo(int); 6019/// }; 6020/// 6021/// The governing language is C++03 [namespace.udecl]p12: 6022/// 6023/// When a using-declaration brings names from a base class into a 6024/// derived class scope, member functions in the derived class 6025/// override and/or hide member functions with the same name and 6026/// parameter types in a base class (rather than conflicting). 6027/// 6028/// There are two ways to implement this: 6029/// (1) optimistically create shadow decls when they're not hidden 6030/// by existing declarations, or 6031/// (2) don't create any shadow decls (or at least don't make them 6032/// visible) until we've fully parsed/instantiated the class. 6033/// The problem with (1) is that we might have to retroactively remove 6034/// a shadow decl, which requires several O(n) operations because the 6035/// decl structures are (very reasonably) not designed for removal. 6036/// (2) avoids this but is very fiddly and phase-dependent. 6037void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6038 if (Shadow->getDeclName().getNameKind() == 6039 DeclarationName::CXXConversionFunctionName) 6040 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6041 6042 // Remove it from the DeclContext... 6043 Shadow->getDeclContext()->removeDecl(Shadow); 6044 6045 // ...and the scope, if applicable... 6046 if (S) { 6047 S->RemoveDecl(Shadow); 6048 IdResolver.RemoveDecl(Shadow); 6049 } 6050 6051 // ...and the using decl. 6052 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6053 6054 // TODO: complain somehow if Shadow was used. It shouldn't 6055 // be possible for this to happen, because...? 6056} 6057 6058/// Builds a using declaration. 6059/// 6060/// \param IsInstantiation - Whether this call arises from an 6061/// instantiation of an unresolved using declaration. We treat 6062/// the lookup differently for these declarations. 6063NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6064 SourceLocation UsingLoc, 6065 CXXScopeSpec &SS, 6066 const DeclarationNameInfo &NameInfo, 6067 AttributeList *AttrList, 6068 bool IsInstantiation, 6069 bool IsTypeName, 6070 SourceLocation TypenameLoc) { 6071 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6072 SourceLocation IdentLoc = NameInfo.getLoc(); 6073 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6074 6075 // FIXME: We ignore attributes for now. 6076 6077 if (SS.isEmpty()) { 6078 Diag(IdentLoc, diag::err_using_requires_qualname); 6079 return 0; 6080 } 6081 6082 // Do the redeclaration lookup in the current scope. 6083 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6084 ForRedeclaration); 6085 Previous.setHideTags(false); 6086 if (S) { 6087 LookupName(Previous, S); 6088 6089 // It is really dumb that we have to do this. 6090 LookupResult::Filter F = Previous.makeFilter(); 6091 while (F.hasNext()) { 6092 NamedDecl *D = F.next(); 6093 if (!isDeclInScope(D, CurContext, S)) 6094 F.erase(); 6095 } 6096 F.done(); 6097 } else { 6098 assert(IsInstantiation && "no scope in non-instantiation"); 6099 assert(CurContext->isRecord() && "scope not record in instantiation"); 6100 LookupQualifiedName(Previous, CurContext); 6101 } 6102 6103 // Check for invalid redeclarations. 6104 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6105 return 0; 6106 6107 // Check for bad qualifiers. 6108 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6109 return 0; 6110 6111 DeclContext *LookupContext = computeDeclContext(SS); 6112 NamedDecl *D; 6113 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6114 if (!LookupContext) { 6115 if (IsTypeName) { 6116 // FIXME: not all declaration name kinds are legal here 6117 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6118 UsingLoc, TypenameLoc, 6119 QualifierLoc, 6120 IdentLoc, NameInfo.getName()); 6121 } else { 6122 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6123 QualifierLoc, NameInfo); 6124 } 6125 } else { 6126 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6127 NameInfo, IsTypeName); 6128 } 6129 D->setAccess(AS); 6130 CurContext->addDecl(D); 6131 6132 if (!LookupContext) return D; 6133 UsingDecl *UD = cast<UsingDecl>(D); 6134 6135 if (RequireCompleteDeclContext(SS, LookupContext)) { 6136 UD->setInvalidDecl(); 6137 return UD; 6138 } 6139 6140 // The normal rules do not apply to inheriting constructor declarations. 6141 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6142 if (CheckInheritingConstructorUsingDecl(UD)) 6143 UD->setInvalidDecl(); 6144 return UD; 6145 } 6146 6147 // Otherwise, look up the target name. 6148 6149 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6150 6151 // Unlike most lookups, we don't always want to hide tag 6152 // declarations: tag names are visible through the using declaration 6153 // even if hidden by ordinary names, *except* in a dependent context 6154 // where it's important for the sanity of two-phase lookup. 6155 if (!IsInstantiation) 6156 R.setHideTags(false); 6157 6158 // For the purposes of this lookup, we have a base object type 6159 // equal to that of the current context. 6160 if (CurContext->isRecord()) { 6161 R.setBaseObjectType( 6162 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6163 } 6164 6165 LookupQualifiedName(R, LookupContext); 6166 6167 if (R.empty()) { 6168 Diag(IdentLoc, diag::err_no_member) 6169 << NameInfo.getName() << LookupContext << SS.getRange(); 6170 UD->setInvalidDecl(); 6171 return UD; 6172 } 6173 6174 if (R.isAmbiguous()) { 6175 UD->setInvalidDecl(); 6176 return UD; 6177 } 6178 6179 if (IsTypeName) { 6180 // If we asked for a typename and got a non-type decl, error out. 6181 if (!R.getAsSingle<TypeDecl>()) { 6182 Diag(IdentLoc, diag::err_using_typename_non_type); 6183 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6184 Diag((*I)->getUnderlyingDecl()->getLocation(), 6185 diag::note_using_decl_target); 6186 UD->setInvalidDecl(); 6187 return UD; 6188 } 6189 } else { 6190 // If we asked for a non-typename and we got a type, error out, 6191 // but only if this is an instantiation of an unresolved using 6192 // decl. Otherwise just silently find the type name. 6193 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6194 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6195 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6196 UD->setInvalidDecl(); 6197 return UD; 6198 } 6199 } 6200 6201 // C++0x N2914 [namespace.udecl]p6: 6202 // A using-declaration shall not name a namespace. 6203 if (R.getAsSingle<NamespaceDecl>()) { 6204 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6205 << SS.getRange(); 6206 UD->setInvalidDecl(); 6207 return UD; 6208 } 6209 6210 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6211 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6212 BuildUsingShadowDecl(S, UD, *I); 6213 } 6214 6215 return UD; 6216} 6217 6218/// Additional checks for a using declaration referring to a constructor name. 6219bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6220 assert(!UD->isTypeName() && "expecting a constructor name"); 6221 6222 const Type *SourceType = UD->getQualifier()->getAsType(); 6223 assert(SourceType && 6224 "Using decl naming constructor doesn't have type in scope spec."); 6225 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6226 6227 // Check whether the named type is a direct base class. 6228 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6229 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6230 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6231 BaseIt != BaseE; ++BaseIt) { 6232 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6233 if (CanonicalSourceType == BaseType) 6234 break; 6235 if (BaseIt->getType()->isDependentType()) 6236 break; 6237 } 6238 6239 if (BaseIt == BaseE) { 6240 // Did not find SourceType in the bases. 6241 Diag(UD->getUsingLocation(), 6242 diag::err_using_decl_constructor_not_in_direct_base) 6243 << UD->getNameInfo().getSourceRange() 6244 << QualType(SourceType, 0) << TargetClass; 6245 return true; 6246 } 6247 6248 if (!CurContext->isDependentContext()) 6249 BaseIt->setInheritConstructors(); 6250 6251 return false; 6252} 6253 6254/// Checks that the given using declaration is not an invalid 6255/// redeclaration. Note that this is checking only for the using decl 6256/// itself, not for any ill-formedness among the UsingShadowDecls. 6257bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6258 bool isTypeName, 6259 const CXXScopeSpec &SS, 6260 SourceLocation NameLoc, 6261 const LookupResult &Prev) { 6262 // C++03 [namespace.udecl]p8: 6263 // C++0x [namespace.udecl]p10: 6264 // A using-declaration is a declaration and can therefore be used 6265 // repeatedly where (and only where) multiple declarations are 6266 // allowed. 6267 // 6268 // That's in non-member contexts. 6269 if (!CurContext->getRedeclContext()->isRecord()) 6270 return false; 6271 6272 NestedNameSpecifier *Qual 6273 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6274 6275 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6276 NamedDecl *D = *I; 6277 6278 bool DTypename; 6279 NestedNameSpecifier *DQual; 6280 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6281 DTypename = UD->isTypeName(); 6282 DQual = UD->getQualifier(); 6283 } else if (UnresolvedUsingValueDecl *UD 6284 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6285 DTypename = false; 6286 DQual = UD->getQualifier(); 6287 } else if (UnresolvedUsingTypenameDecl *UD 6288 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6289 DTypename = true; 6290 DQual = UD->getQualifier(); 6291 } else continue; 6292 6293 // using decls differ if one says 'typename' and the other doesn't. 6294 // FIXME: non-dependent using decls? 6295 if (isTypeName != DTypename) continue; 6296 6297 // using decls differ if they name different scopes (but note that 6298 // template instantiation can cause this check to trigger when it 6299 // didn't before instantiation). 6300 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6301 Context.getCanonicalNestedNameSpecifier(DQual)) 6302 continue; 6303 6304 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6305 Diag(D->getLocation(), diag::note_using_decl) << 1; 6306 return true; 6307 } 6308 6309 return false; 6310} 6311 6312 6313/// Checks that the given nested-name qualifier used in a using decl 6314/// in the current context is appropriately related to the current 6315/// scope. If an error is found, diagnoses it and returns true. 6316bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6317 const CXXScopeSpec &SS, 6318 SourceLocation NameLoc) { 6319 DeclContext *NamedContext = computeDeclContext(SS); 6320 6321 if (!CurContext->isRecord()) { 6322 // C++03 [namespace.udecl]p3: 6323 // C++0x [namespace.udecl]p8: 6324 // A using-declaration for a class member shall be a member-declaration. 6325 6326 // If we weren't able to compute a valid scope, it must be a 6327 // dependent class scope. 6328 if (!NamedContext || NamedContext->isRecord()) { 6329 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6330 << SS.getRange(); 6331 return true; 6332 } 6333 6334 // Otherwise, everything is known to be fine. 6335 return false; 6336 } 6337 6338 // The current scope is a record. 6339 6340 // If the named context is dependent, we can't decide much. 6341 if (!NamedContext) { 6342 // FIXME: in C++0x, we can diagnose if we can prove that the 6343 // nested-name-specifier does not refer to a base class, which is 6344 // still possible in some cases. 6345 6346 // Otherwise we have to conservatively report that things might be 6347 // okay. 6348 return false; 6349 } 6350 6351 if (!NamedContext->isRecord()) { 6352 // Ideally this would point at the last name in the specifier, 6353 // but we don't have that level of source info. 6354 Diag(SS.getRange().getBegin(), 6355 diag::err_using_decl_nested_name_specifier_is_not_class) 6356 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6357 return true; 6358 } 6359 6360 if (!NamedContext->isDependentContext() && 6361 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6362 return true; 6363 6364 if (getLangOpts().CPlusPlus0x) { 6365 // C++0x [namespace.udecl]p3: 6366 // In a using-declaration used as a member-declaration, the 6367 // nested-name-specifier shall name a base class of the class 6368 // being defined. 6369 6370 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6371 cast<CXXRecordDecl>(NamedContext))) { 6372 if (CurContext == NamedContext) { 6373 Diag(NameLoc, 6374 diag::err_using_decl_nested_name_specifier_is_current_class) 6375 << SS.getRange(); 6376 return true; 6377 } 6378 6379 Diag(SS.getRange().getBegin(), 6380 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6381 << (NestedNameSpecifier*) SS.getScopeRep() 6382 << cast<CXXRecordDecl>(CurContext) 6383 << SS.getRange(); 6384 return true; 6385 } 6386 6387 return false; 6388 } 6389 6390 // C++03 [namespace.udecl]p4: 6391 // A using-declaration used as a member-declaration shall refer 6392 // to a member of a base class of the class being defined [etc.]. 6393 6394 // Salient point: SS doesn't have to name a base class as long as 6395 // lookup only finds members from base classes. Therefore we can 6396 // diagnose here only if we can prove that that can't happen, 6397 // i.e. if the class hierarchies provably don't intersect. 6398 6399 // TODO: it would be nice if "definitely valid" results were cached 6400 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6401 // need to be repeated. 6402 6403 struct UserData { 6404 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6405 6406 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6407 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6408 Data->Bases.insert(Base); 6409 return true; 6410 } 6411 6412 bool hasDependentBases(const CXXRecordDecl *Class) { 6413 return !Class->forallBases(collect, this); 6414 } 6415 6416 /// Returns true if the base is dependent or is one of the 6417 /// accumulated base classes. 6418 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6419 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6420 return !Data->Bases.count(Base); 6421 } 6422 6423 bool mightShareBases(const CXXRecordDecl *Class) { 6424 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6425 } 6426 }; 6427 6428 UserData Data; 6429 6430 // Returns false if we find a dependent base. 6431 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6432 return false; 6433 6434 // Returns false if the class has a dependent base or if it or one 6435 // of its bases is present in the base set of the current context. 6436 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6437 return false; 6438 6439 Diag(SS.getRange().getBegin(), 6440 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6441 << (NestedNameSpecifier*) SS.getScopeRep() 6442 << cast<CXXRecordDecl>(CurContext) 6443 << SS.getRange(); 6444 6445 return true; 6446} 6447 6448Decl *Sema::ActOnAliasDeclaration(Scope *S, 6449 AccessSpecifier AS, 6450 MultiTemplateParamsArg TemplateParamLists, 6451 SourceLocation UsingLoc, 6452 UnqualifiedId &Name, 6453 TypeResult Type) { 6454 // Skip up to the relevant declaration scope. 6455 while (S->getFlags() & Scope::TemplateParamScope) 6456 S = S->getParent(); 6457 assert((S->getFlags() & Scope::DeclScope) && 6458 "got alias-declaration outside of declaration scope"); 6459 6460 if (Type.isInvalid()) 6461 return 0; 6462 6463 bool Invalid = false; 6464 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6465 TypeSourceInfo *TInfo = 0; 6466 GetTypeFromParser(Type.get(), &TInfo); 6467 6468 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6469 return 0; 6470 6471 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6472 UPPC_DeclarationType)) { 6473 Invalid = true; 6474 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6475 TInfo->getTypeLoc().getBeginLoc()); 6476 } 6477 6478 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6479 LookupName(Previous, S); 6480 6481 // Warn about shadowing the name of a template parameter. 6482 if (Previous.isSingleResult() && 6483 Previous.getFoundDecl()->isTemplateParameter()) { 6484 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6485 Previous.clear(); 6486 } 6487 6488 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6489 "name in alias declaration must be an identifier"); 6490 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6491 Name.StartLocation, 6492 Name.Identifier, TInfo); 6493 6494 NewTD->setAccess(AS); 6495 6496 if (Invalid) 6497 NewTD->setInvalidDecl(); 6498 6499 CheckTypedefForVariablyModifiedType(S, NewTD); 6500 Invalid |= NewTD->isInvalidDecl(); 6501 6502 bool Redeclaration = false; 6503 6504 NamedDecl *NewND; 6505 if (TemplateParamLists.size()) { 6506 TypeAliasTemplateDecl *OldDecl = 0; 6507 TemplateParameterList *OldTemplateParams = 0; 6508 6509 if (TemplateParamLists.size() != 1) { 6510 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6511 << SourceRange(TemplateParamLists.get()[1]->getTemplateLoc(), 6512 TemplateParamLists.get()[TemplateParamLists.size()-1]->getRAngleLoc()); 6513 } 6514 TemplateParameterList *TemplateParams = TemplateParamLists.get()[0]; 6515 6516 // Only consider previous declarations in the same scope. 6517 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6518 /*ExplicitInstantiationOrSpecialization*/false); 6519 if (!Previous.empty()) { 6520 Redeclaration = true; 6521 6522 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6523 if (!OldDecl && !Invalid) { 6524 Diag(UsingLoc, diag::err_redefinition_different_kind) 6525 << Name.Identifier; 6526 6527 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6528 if (OldD->getLocation().isValid()) 6529 Diag(OldD->getLocation(), diag::note_previous_definition); 6530 6531 Invalid = true; 6532 } 6533 6534 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6535 if (TemplateParameterListsAreEqual(TemplateParams, 6536 OldDecl->getTemplateParameters(), 6537 /*Complain=*/true, 6538 TPL_TemplateMatch)) 6539 OldTemplateParams = OldDecl->getTemplateParameters(); 6540 else 6541 Invalid = true; 6542 6543 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6544 if (!Invalid && 6545 !Context.hasSameType(OldTD->getUnderlyingType(), 6546 NewTD->getUnderlyingType())) { 6547 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6548 // but we can't reasonably accept it. 6549 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6550 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6551 if (OldTD->getLocation().isValid()) 6552 Diag(OldTD->getLocation(), diag::note_previous_definition); 6553 Invalid = true; 6554 } 6555 } 6556 } 6557 6558 // Merge any previous default template arguments into our parameters, 6559 // and check the parameter list. 6560 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6561 TPC_TypeAliasTemplate)) 6562 return 0; 6563 6564 TypeAliasTemplateDecl *NewDecl = 6565 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6566 Name.Identifier, TemplateParams, 6567 NewTD); 6568 6569 NewDecl->setAccess(AS); 6570 6571 if (Invalid) 6572 NewDecl->setInvalidDecl(); 6573 else if (OldDecl) 6574 NewDecl->setPreviousDeclaration(OldDecl); 6575 6576 NewND = NewDecl; 6577 } else { 6578 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6579 NewND = NewTD; 6580 } 6581 6582 if (!Redeclaration) 6583 PushOnScopeChains(NewND, S); 6584 6585 return NewND; 6586} 6587 6588Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6589 SourceLocation NamespaceLoc, 6590 SourceLocation AliasLoc, 6591 IdentifierInfo *Alias, 6592 CXXScopeSpec &SS, 6593 SourceLocation IdentLoc, 6594 IdentifierInfo *Ident) { 6595 6596 // Lookup the namespace name. 6597 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6598 LookupParsedName(R, S, &SS); 6599 6600 // Check if we have a previous declaration with the same name. 6601 NamedDecl *PrevDecl 6602 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6603 ForRedeclaration); 6604 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6605 PrevDecl = 0; 6606 6607 if (PrevDecl) { 6608 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6609 // We already have an alias with the same name that points to the same 6610 // namespace, so don't create a new one. 6611 // FIXME: At some point, we'll want to create the (redundant) 6612 // declaration to maintain better source information. 6613 if (!R.isAmbiguous() && !R.empty() && 6614 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6615 return 0; 6616 } 6617 6618 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6619 diag::err_redefinition_different_kind; 6620 Diag(AliasLoc, DiagID) << Alias; 6621 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6622 return 0; 6623 } 6624 6625 if (R.isAmbiguous()) 6626 return 0; 6627 6628 if (R.empty()) { 6629 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6630 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6631 return 0; 6632 } 6633 } 6634 6635 NamespaceAliasDecl *AliasDecl = 6636 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6637 Alias, SS.getWithLocInContext(Context), 6638 IdentLoc, R.getFoundDecl()); 6639 6640 PushOnScopeChains(AliasDecl, S); 6641 return AliasDecl; 6642} 6643 6644namespace { 6645 /// \brief Scoped object used to handle the state changes required in Sema 6646 /// to implicitly define the body of a C++ member function; 6647 class ImplicitlyDefinedFunctionScope { 6648 Sema &S; 6649 Sema::ContextRAII SavedContext; 6650 6651 public: 6652 ImplicitlyDefinedFunctionScope(Sema &S, CXXMethodDecl *Method) 6653 : S(S), SavedContext(S, Method) 6654 { 6655 S.PushFunctionScope(); 6656 S.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated); 6657 } 6658 6659 ~ImplicitlyDefinedFunctionScope() { 6660 S.PopExpressionEvaluationContext(); 6661 S.PopFunctionScopeInfo(); 6662 } 6663 }; 6664} 6665 6666Sema::ImplicitExceptionSpecification 6667Sema::ComputeDefaultedDefaultCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 6668 // C++ [except.spec]p14: 6669 // An implicitly declared special member function (Clause 12) shall have an 6670 // exception-specification. [...] 6671 ImplicitExceptionSpecification ExceptSpec(*this); 6672 if (ClassDecl->isInvalidDecl()) 6673 return ExceptSpec; 6674 6675 // Direct base-class constructors. 6676 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6677 BEnd = ClassDecl->bases_end(); 6678 B != BEnd; ++B) { 6679 if (B->isVirtual()) // Handled below. 6680 continue; 6681 6682 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6683 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6684 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6685 // If this is a deleted function, add it anyway. This might be conformant 6686 // with the standard. This might not. I'm not sure. It might not matter. 6687 if (Constructor) 6688 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6689 } 6690 } 6691 6692 // Virtual base-class constructors. 6693 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6694 BEnd = ClassDecl->vbases_end(); 6695 B != BEnd; ++B) { 6696 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6697 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6698 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6699 // If this is a deleted function, add it anyway. This might be conformant 6700 // with the standard. This might not. I'm not sure. It might not matter. 6701 if (Constructor) 6702 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6703 } 6704 } 6705 6706 // Field constructors. 6707 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6708 FEnd = ClassDecl->field_end(); 6709 F != FEnd; ++F) { 6710 if (F->hasInClassInitializer()) { 6711 if (Expr *E = F->getInClassInitializer()) 6712 ExceptSpec.CalledExpr(E); 6713 else if (!F->isInvalidDecl()) 6714 ExceptSpec.SetDelayed(); 6715 } else if (const RecordType *RecordTy 6716 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6717 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6718 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6719 // If this is a deleted function, add it anyway. This might be conformant 6720 // with the standard. This might not. I'm not sure. It might not matter. 6721 // In particular, the problem is that this function never gets called. It 6722 // might just be ill-formed because this function attempts to refer to 6723 // a deleted function here. 6724 if (Constructor) 6725 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6726 } 6727 } 6728 6729 return ExceptSpec; 6730} 6731 6732CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6733 CXXRecordDecl *ClassDecl) { 6734 // C++ [class.ctor]p5: 6735 // A default constructor for a class X is a constructor of class X 6736 // that can be called without an argument. If there is no 6737 // user-declared constructor for class X, a default constructor is 6738 // implicitly declared. An implicitly-declared default constructor 6739 // is an inline public member of its class. 6740 assert(!ClassDecl->hasUserDeclaredConstructor() && 6741 "Should not build implicit default constructor!"); 6742 6743 ImplicitExceptionSpecification Spec = 6744 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6745 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6746 6747 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6748 CXXDefaultConstructor, 6749 false); 6750 6751 // Create the actual constructor declaration. 6752 CanQualType ClassType 6753 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6754 SourceLocation ClassLoc = ClassDecl->getLocation(); 6755 DeclarationName Name 6756 = Context.DeclarationNames.getCXXConstructorName(ClassType); 6757 DeclarationNameInfo NameInfo(Name, ClassLoc); 6758 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 6759 Context, ClassDecl, ClassLoc, NameInfo, 6760 Context.getFunctionType(Context.VoidTy, 0, 0, EPI), /*TInfo=*/0, 6761 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 6762 Constexpr); 6763 DefaultCon->setAccess(AS_public); 6764 DefaultCon->setDefaulted(); 6765 DefaultCon->setImplicit(); 6766 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 6767 6768 // Note that we have declared this constructor. 6769 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 6770 6771 if (Scope *S = getScopeForContext(ClassDecl)) 6772 PushOnScopeChains(DefaultCon, S, false); 6773 ClassDecl->addDecl(DefaultCon); 6774 6775 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 6776 DefaultCon->setDeletedAsWritten(); 6777 6778 return DefaultCon; 6779} 6780 6781void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 6782 CXXConstructorDecl *Constructor) { 6783 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 6784 !Constructor->doesThisDeclarationHaveABody() && 6785 !Constructor->isDeleted()) && 6786 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 6787 6788 CXXRecordDecl *ClassDecl = Constructor->getParent(); 6789 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 6790 6791 ImplicitlyDefinedFunctionScope Scope(*this, Constructor); 6792 DiagnosticErrorTrap Trap(Diags); 6793 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 6794 Trap.hasErrorOccurred()) { 6795 Diag(CurrentLocation, diag::note_member_synthesized_at) 6796 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 6797 Constructor->setInvalidDecl(); 6798 return; 6799 } 6800 6801 SourceLocation Loc = Constructor->getLocation(); 6802 Constructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 6803 6804 Constructor->setUsed(); 6805 MarkVTableUsed(CurrentLocation, ClassDecl); 6806 6807 if (ASTMutationListener *L = getASTMutationListener()) { 6808 L->CompletedImplicitDefinition(Constructor); 6809 } 6810} 6811 6812/// Get any existing defaulted default constructor for the given class. Do not 6813/// implicitly define one if it does not exist. 6814static CXXConstructorDecl *getDefaultedDefaultConstructorUnsafe(Sema &Self, 6815 CXXRecordDecl *D) { 6816 ASTContext &Context = Self.Context; 6817 QualType ClassType = Context.getTypeDeclType(D); 6818 DeclarationName ConstructorName 6819 = Context.DeclarationNames.getCXXConstructorName( 6820 Context.getCanonicalType(ClassType.getUnqualifiedType())); 6821 6822 DeclContext::lookup_const_iterator Con, ConEnd; 6823 for (llvm::tie(Con, ConEnd) = D->lookup(ConstructorName); 6824 Con != ConEnd; ++Con) { 6825 // A function template cannot be defaulted. 6826 if (isa<FunctionTemplateDecl>(*Con)) 6827 continue; 6828 6829 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 6830 if (Constructor->isDefaultConstructor()) 6831 return Constructor->isDefaulted() ? Constructor : 0; 6832 } 6833 return 0; 6834} 6835 6836void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 6837 if (!D) return; 6838 AdjustDeclIfTemplate(D); 6839 6840 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 6841 CXXConstructorDecl *CtorDecl 6842 = getDefaultedDefaultConstructorUnsafe(*this, ClassDecl); 6843 6844 if (!CtorDecl) return; 6845 6846 // Compute the exception specification for the default constructor. 6847 const FunctionProtoType *CtorTy = 6848 CtorDecl->getType()->castAs<FunctionProtoType>(); 6849 if (CtorTy->getExceptionSpecType() == EST_Delayed) { 6850 // FIXME: Don't do this unless the exception spec is needed. 6851 ImplicitExceptionSpecification Spec = 6852 ComputeDefaultedDefaultCtorExceptionSpec(ClassDecl); 6853 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 6854 assert(EPI.ExceptionSpecType != EST_Delayed); 6855 6856 CtorDecl->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 6857 } 6858 6859 // If the default constructor is explicitly defaulted, checking the exception 6860 // specification is deferred until now. 6861 if (!CtorDecl->isInvalidDecl() && CtorDecl->isExplicitlyDefaulted() && 6862 !ClassDecl->isDependentType()) 6863 CheckExplicitlyDefaultedSpecialMember(CtorDecl); 6864} 6865 6866void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 6867 // We start with an initial pass over the base classes to collect those that 6868 // inherit constructors from. If there are none, we can forgo all further 6869 // processing. 6870 typedef SmallVector<const RecordType *, 4> BasesVector; 6871 BasesVector BasesToInheritFrom; 6872 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 6873 BaseE = ClassDecl->bases_end(); 6874 BaseIt != BaseE; ++BaseIt) { 6875 if (BaseIt->getInheritConstructors()) { 6876 QualType Base = BaseIt->getType(); 6877 if (Base->isDependentType()) { 6878 // If we inherit constructors from anything that is dependent, just 6879 // abort processing altogether. We'll get another chance for the 6880 // instantiations. 6881 return; 6882 } 6883 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 6884 } 6885 } 6886 if (BasesToInheritFrom.empty()) 6887 return; 6888 6889 // Now collect the constructors that we already have in the current class. 6890 // Those take precedence over inherited constructors. 6891 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 6892 // unless there is a user-declared constructor with the same signature in 6893 // the class where the using-declaration appears. 6894 llvm::SmallSet<const Type *, 8> ExistingConstructors; 6895 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 6896 CtorE = ClassDecl->ctor_end(); 6897 CtorIt != CtorE; ++CtorIt) { 6898 ExistingConstructors.insert( 6899 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 6900 } 6901 6902 DeclarationName CreatedCtorName = 6903 Context.DeclarationNames.getCXXConstructorName( 6904 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 6905 6906 // Now comes the true work. 6907 // First, we keep a map from constructor types to the base that introduced 6908 // them. Needed for finding conflicting constructors. We also keep the 6909 // actually inserted declarations in there, for pretty diagnostics. 6910 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 6911 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 6912 ConstructorToSourceMap InheritedConstructors; 6913 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 6914 BaseE = BasesToInheritFrom.end(); 6915 BaseIt != BaseE; ++BaseIt) { 6916 const RecordType *Base = *BaseIt; 6917 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 6918 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 6919 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 6920 CtorE = BaseDecl->ctor_end(); 6921 CtorIt != CtorE; ++CtorIt) { 6922 // Find the using declaration for inheriting this base's constructors. 6923 // FIXME: Don't perform name lookup just to obtain a source location! 6924 DeclarationName Name = 6925 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 6926 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 6927 LookupQualifiedName(Result, CurContext); 6928 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 6929 SourceLocation UsingLoc = UD ? UD->getLocation() : 6930 ClassDecl->getLocation(); 6931 6932 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 6933 // from the class X named in the using-declaration consists of actual 6934 // constructors and notional constructors that result from the 6935 // transformation of defaulted parameters as follows: 6936 // - all non-template default constructors of X, and 6937 // - for each non-template constructor of X that has at least one 6938 // parameter with a default argument, the set of constructors that 6939 // results from omitting any ellipsis parameter specification and 6940 // successively omitting parameters with a default argument from the 6941 // end of the parameter-type-list. 6942 CXXConstructorDecl *BaseCtor = *CtorIt; 6943 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 6944 const FunctionProtoType *BaseCtorType = 6945 BaseCtor->getType()->getAs<FunctionProtoType>(); 6946 6947 for (unsigned params = BaseCtor->getMinRequiredArguments(), 6948 maxParams = BaseCtor->getNumParams(); 6949 params <= maxParams; ++params) { 6950 // Skip default constructors. They're never inherited. 6951 if (params == 0) 6952 continue; 6953 // Skip copy and move constructors for the same reason. 6954 if (CanBeCopyOrMove && params == 1) 6955 continue; 6956 6957 // Build up a function type for this particular constructor. 6958 // FIXME: The working paper does not consider that the exception spec 6959 // for the inheriting constructor might be larger than that of the 6960 // source. This code doesn't yet, either. When it does, this code will 6961 // need to be delayed until after exception specifications and in-class 6962 // member initializers are attached. 6963 const Type *NewCtorType; 6964 if (params == maxParams) 6965 NewCtorType = BaseCtorType; 6966 else { 6967 SmallVector<QualType, 16> Args; 6968 for (unsigned i = 0; i < params; ++i) { 6969 Args.push_back(BaseCtorType->getArgType(i)); 6970 } 6971 FunctionProtoType::ExtProtoInfo ExtInfo = 6972 BaseCtorType->getExtProtoInfo(); 6973 ExtInfo.Variadic = false; 6974 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 6975 Args.data(), params, ExtInfo) 6976 .getTypePtr(); 6977 } 6978 const Type *CanonicalNewCtorType = 6979 Context.getCanonicalType(NewCtorType); 6980 6981 // Now that we have the type, first check if the class already has a 6982 // constructor with this signature. 6983 if (ExistingConstructors.count(CanonicalNewCtorType)) 6984 continue; 6985 6986 // Then we check if we have already declared an inherited constructor 6987 // with this signature. 6988 std::pair<ConstructorToSourceMap::iterator, bool> result = 6989 InheritedConstructors.insert(std::make_pair( 6990 CanonicalNewCtorType, 6991 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 6992 if (!result.second) { 6993 // Already in the map. If it came from a different class, that's an 6994 // error. Not if it's from the same. 6995 CanQualType PreviousBase = result.first->second.first; 6996 if (CanonicalBase != PreviousBase) { 6997 const CXXConstructorDecl *PrevCtor = result.first->second.second; 6998 const CXXConstructorDecl *PrevBaseCtor = 6999 PrevCtor->getInheritedConstructor(); 7000 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7001 7002 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7003 Diag(BaseCtor->getLocation(), 7004 diag::note_using_decl_constructor_conflict_current_ctor); 7005 Diag(PrevBaseCtor->getLocation(), 7006 diag::note_using_decl_constructor_conflict_previous_ctor); 7007 Diag(PrevCtor->getLocation(), 7008 diag::note_using_decl_constructor_conflict_previous_using); 7009 } 7010 continue; 7011 } 7012 7013 // OK, we're there, now add the constructor. 7014 // C++0x [class.inhctor]p8: [...] that would be performed by a 7015 // user-written inline constructor [...] 7016 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7017 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7018 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7019 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7020 /*ImplicitlyDeclared=*/true, 7021 // FIXME: Due to a defect in the standard, we treat inherited 7022 // constructors as constexpr even if that makes them ill-formed. 7023 /*Constexpr=*/BaseCtor->isConstexpr()); 7024 NewCtor->setAccess(BaseCtor->getAccess()); 7025 7026 // Build up the parameter decls and add them. 7027 SmallVector<ParmVarDecl *, 16> ParamDecls; 7028 for (unsigned i = 0; i < params; ++i) { 7029 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7030 UsingLoc, UsingLoc, 7031 /*IdentifierInfo=*/0, 7032 BaseCtorType->getArgType(i), 7033 /*TInfo=*/0, SC_None, 7034 SC_None, /*DefaultArg=*/0)); 7035 } 7036 NewCtor->setParams(ParamDecls); 7037 NewCtor->setInheritedConstructor(BaseCtor); 7038 7039 ClassDecl->addDecl(NewCtor); 7040 result.first->second.second = NewCtor; 7041 } 7042 } 7043 } 7044} 7045 7046Sema::ImplicitExceptionSpecification 7047Sema::ComputeDefaultedDtorExceptionSpec(CXXRecordDecl *ClassDecl) { 7048 // C++ [except.spec]p14: 7049 // An implicitly declared special member function (Clause 12) shall have 7050 // an exception-specification. 7051 ImplicitExceptionSpecification ExceptSpec(*this); 7052 if (ClassDecl->isInvalidDecl()) 7053 return ExceptSpec; 7054 7055 // Direct base-class destructors. 7056 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7057 BEnd = ClassDecl->bases_end(); 7058 B != BEnd; ++B) { 7059 if (B->isVirtual()) // Handled below. 7060 continue; 7061 7062 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7063 ExceptSpec.CalledDecl(B->getLocStart(), 7064 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7065 } 7066 7067 // Virtual base-class destructors. 7068 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7069 BEnd = ClassDecl->vbases_end(); 7070 B != BEnd; ++B) { 7071 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7072 ExceptSpec.CalledDecl(B->getLocStart(), 7073 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7074 } 7075 7076 // Field destructors. 7077 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7078 FEnd = ClassDecl->field_end(); 7079 F != FEnd; ++F) { 7080 if (const RecordType *RecordTy 7081 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7082 ExceptSpec.CalledDecl(F->getLocation(), 7083 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7084 } 7085 7086 return ExceptSpec; 7087} 7088 7089CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7090 // C++ [class.dtor]p2: 7091 // If a class has no user-declared destructor, a destructor is 7092 // declared implicitly. An implicitly-declared destructor is an 7093 // inline public member of its class. 7094 7095 ImplicitExceptionSpecification Spec = 7096 ComputeDefaultedDtorExceptionSpec(ClassDecl); 7097 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7098 7099 // Create the actual destructor declaration. 7100 QualType Ty = Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 7101 7102 CanQualType ClassType 7103 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7104 SourceLocation ClassLoc = ClassDecl->getLocation(); 7105 DeclarationName Name 7106 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7107 DeclarationNameInfo NameInfo(Name, ClassLoc); 7108 CXXDestructorDecl *Destructor 7109 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, Ty, 0, 7110 /*isInline=*/true, 7111 /*isImplicitlyDeclared=*/true); 7112 Destructor->setAccess(AS_public); 7113 Destructor->setDefaulted(); 7114 Destructor->setImplicit(); 7115 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7116 7117 // Note that we have declared this destructor. 7118 ++ASTContext::NumImplicitDestructorsDeclared; 7119 7120 // Introduce this destructor into its scope. 7121 if (Scope *S = getScopeForContext(ClassDecl)) 7122 PushOnScopeChains(Destructor, S, false); 7123 ClassDecl->addDecl(Destructor); 7124 7125 // This could be uniqued if it ever proves significant. 7126 Destructor->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(Ty)); 7127 7128 AddOverriddenMethods(ClassDecl, Destructor); 7129 7130 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7131 Destructor->setDeletedAsWritten(); 7132 7133 return Destructor; 7134} 7135 7136void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7137 CXXDestructorDecl *Destructor) { 7138 assert((Destructor->isDefaulted() && 7139 !Destructor->doesThisDeclarationHaveABody() && 7140 !Destructor->isDeleted()) && 7141 "DefineImplicitDestructor - call it for implicit default dtor"); 7142 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7143 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7144 7145 if (Destructor->isInvalidDecl()) 7146 return; 7147 7148 ImplicitlyDefinedFunctionScope Scope(*this, Destructor); 7149 7150 DiagnosticErrorTrap Trap(Diags); 7151 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7152 Destructor->getParent()); 7153 7154 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7155 Diag(CurrentLocation, diag::note_member_synthesized_at) 7156 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7157 7158 Destructor->setInvalidDecl(); 7159 return; 7160 } 7161 7162 SourceLocation Loc = Destructor->getLocation(); 7163 Destructor->setBody(new (Context) CompoundStmt(Context, 0, 0, Loc, Loc)); 7164 Destructor->setImplicitlyDefined(true); 7165 Destructor->setUsed(); 7166 MarkVTableUsed(CurrentLocation, ClassDecl); 7167 7168 if (ASTMutationListener *L = getASTMutationListener()) { 7169 L->CompletedImplicitDefinition(Destructor); 7170 } 7171} 7172 7173/// \brief Perform any semantic analysis which needs to be delayed until all 7174/// pending class member declarations have been parsed. 7175void Sema::ActOnFinishCXXMemberDecls() { 7176 // Now we have parsed all exception specifications, determine the implicit 7177 // exception specifications for destructors. 7178 for (unsigned i = 0, e = DelayedDestructorExceptionSpecs.size(); 7179 i != e; ++i) { 7180 CXXDestructorDecl *Dtor = DelayedDestructorExceptionSpecs[i]; 7181 AdjustDestructorExceptionSpec(Dtor->getParent(), Dtor, true); 7182 } 7183 DelayedDestructorExceptionSpecs.clear(); 7184 7185 // Perform any deferred checking of exception specifications for virtual 7186 // destructors. 7187 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7188 i != e; ++i) { 7189 const CXXDestructorDecl *Dtor = 7190 DelayedDestructorExceptionSpecChecks[i].first; 7191 assert(!Dtor->getParent()->isDependentType() && 7192 "Should not ever add destructors of templates into the list."); 7193 CheckOverridingFunctionExceptionSpec(Dtor, 7194 DelayedDestructorExceptionSpecChecks[i].second); 7195 } 7196 DelayedDestructorExceptionSpecChecks.clear(); 7197} 7198 7199void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *classDecl, 7200 CXXDestructorDecl *destructor, 7201 bool WasDelayed) { 7202 // C++11 [class.dtor]p3: 7203 // A declaration of a destructor that does not have an exception- 7204 // specification is implicitly considered to have the same exception- 7205 // specification as an implicit declaration. 7206 const FunctionProtoType *dtorType = destructor->getType()-> 7207 getAs<FunctionProtoType>(); 7208 if (!WasDelayed && dtorType->hasExceptionSpec()) 7209 return; 7210 7211 ImplicitExceptionSpecification exceptSpec = 7212 ComputeDefaultedDtorExceptionSpec(classDecl); 7213 7214 // Replace the destructor's type, building off the existing one. Fortunately, 7215 // the only thing of interest in the destructor type is its extended info. 7216 // The return and arguments are fixed. 7217 FunctionProtoType::ExtProtoInfo epi = dtorType->getExtProtoInfo(); 7218 epi.ExceptionSpecType = exceptSpec.getExceptionSpecType(); 7219 epi.NumExceptions = exceptSpec.size(); 7220 epi.Exceptions = exceptSpec.data(); 7221 QualType ty = Context.getFunctionType(Context.VoidTy, 0, 0, epi); 7222 7223 destructor->setType(ty); 7224 7225 // If we can't compute the exception specification for this destructor yet 7226 // (because it depends on an exception specification which we have not parsed 7227 // yet), make a note that we need to try again when the class is complete. 7228 if (epi.ExceptionSpecType == EST_Delayed) { 7229 assert(!WasDelayed && "couldn't compute destructor exception spec"); 7230 DelayedDestructorExceptionSpecs.push_back(destructor); 7231 } 7232 7233 // FIXME: If the destructor has a body that could throw, and the newly created 7234 // spec doesn't allow exceptions, we should emit a warning, because this 7235 // change in behavior can break conforming C++03 programs at runtime. 7236 // However, we don't have a body yet, so it needs to be done somewhere else. 7237} 7238 7239/// \brief Builds a statement that copies/moves the given entity from \p From to 7240/// \c To. 7241/// 7242/// This routine is used to copy/move the members of a class with an 7243/// implicitly-declared copy/move assignment operator. When the entities being 7244/// copied are arrays, this routine builds for loops to copy them. 7245/// 7246/// \param S The Sema object used for type-checking. 7247/// 7248/// \param Loc The location where the implicit copy/move is being generated. 7249/// 7250/// \param T The type of the expressions being copied/moved. Both expressions 7251/// must have this type. 7252/// 7253/// \param To The expression we are copying/moving to. 7254/// 7255/// \param From The expression we are copying/moving from. 7256/// 7257/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7258/// Otherwise, it's a non-static member subobject. 7259/// 7260/// \param Copying Whether we're copying or moving. 7261/// 7262/// \param Depth Internal parameter recording the depth of the recursion. 7263/// 7264/// \returns A statement or a loop that copies the expressions. 7265static StmtResult 7266BuildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7267 Expr *To, Expr *From, 7268 bool CopyingBaseSubobject, bool Copying, 7269 unsigned Depth = 0) { 7270 // C++0x [class.copy]p28: 7271 // Each subobject is assigned in the manner appropriate to its type: 7272 // 7273 // - if the subobject is of class type, as if by a call to operator= with 7274 // the subobject as the object expression and the corresponding 7275 // subobject of x as a single function argument (as if by explicit 7276 // qualification; that is, ignoring any possible virtual overriding 7277 // functions in more derived classes); 7278 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7279 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7280 7281 // Look for operator=. 7282 DeclarationName Name 7283 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7284 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7285 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7286 7287 // Filter out any result that isn't a copy/move-assignment operator. 7288 LookupResult::Filter F = OpLookup.makeFilter(); 7289 while (F.hasNext()) { 7290 NamedDecl *D = F.next(); 7291 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7292 if (Method->isCopyAssignmentOperator() || 7293 (!Copying && Method->isMoveAssignmentOperator())) 7294 continue; 7295 7296 F.erase(); 7297 } 7298 F.done(); 7299 7300 // Suppress the protected check (C++ [class.protected]) for each of the 7301 // assignment operators we found. This strange dance is required when 7302 // we're assigning via a base classes's copy-assignment operator. To 7303 // ensure that we're getting the right base class subobject (without 7304 // ambiguities), we need to cast "this" to that subobject type; to 7305 // ensure that we don't go through the virtual call mechanism, we need 7306 // to qualify the operator= name with the base class (see below). However, 7307 // this means that if the base class has a protected copy assignment 7308 // operator, the protected member access check will fail. So, we 7309 // rewrite "protected" access to "public" access in this case, since we 7310 // know by construction that we're calling from a derived class. 7311 if (CopyingBaseSubobject) { 7312 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7313 L != LEnd; ++L) { 7314 if (L.getAccess() == AS_protected) 7315 L.setAccess(AS_public); 7316 } 7317 } 7318 7319 // Create the nested-name-specifier that will be used to qualify the 7320 // reference to operator=; this is required to suppress the virtual 7321 // call mechanism. 7322 CXXScopeSpec SS; 7323 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7324 SS.MakeTrivial(S.Context, 7325 NestedNameSpecifier::Create(S.Context, 0, false, 7326 CanonicalT), 7327 Loc); 7328 7329 // Create the reference to operator=. 7330 ExprResult OpEqualRef 7331 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7332 /*TemplateKWLoc=*/SourceLocation(), 7333 /*FirstQualifierInScope=*/0, 7334 OpLookup, 7335 /*TemplateArgs=*/0, 7336 /*SuppressQualifierCheck=*/true); 7337 if (OpEqualRef.isInvalid()) 7338 return StmtError(); 7339 7340 // Build the call to the assignment operator. 7341 7342 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7343 OpEqualRef.takeAs<Expr>(), 7344 Loc, &From, 1, Loc); 7345 if (Call.isInvalid()) 7346 return StmtError(); 7347 7348 return S.Owned(Call.takeAs<Stmt>()); 7349 } 7350 7351 // - if the subobject is of scalar type, the built-in assignment 7352 // operator is used. 7353 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7354 if (!ArrayTy) { 7355 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7356 if (Assignment.isInvalid()) 7357 return StmtError(); 7358 7359 return S.Owned(Assignment.takeAs<Stmt>()); 7360 } 7361 7362 // - if the subobject is an array, each element is assigned, in the 7363 // manner appropriate to the element type; 7364 7365 // Construct a loop over the array bounds, e.g., 7366 // 7367 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7368 // 7369 // that will copy each of the array elements. 7370 QualType SizeType = S.Context.getSizeType(); 7371 7372 // Create the iteration variable. 7373 IdentifierInfo *IterationVarName = 0; 7374 { 7375 SmallString<8> Str; 7376 llvm::raw_svector_ostream OS(Str); 7377 OS << "__i" << Depth; 7378 IterationVarName = &S.Context.Idents.get(OS.str()); 7379 } 7380 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7381 IterationVarName, SizeType, 7382 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7383 SC_None, SC_None); 7384 7385 // Initialize the iteration variable to zero. 7386 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7387 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7388 7389 // Create a reference to the iteration variable; we'll use this several 7390 // times throughout. 7391 Expr *IterationVarRef 7392 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7393 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7394 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7395 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7396 7397 // Create the DeclStmt that holds the iteration variable. 7398 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7399 7400 // Create the comparison against the array bound. 7401 llvm::APInt Upper 7402 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7403 Expr *Comparison 7404 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7405 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7406 BO_NE, S.Context.BoolTy, 7407 VK_RValue, OK_Ordinary, Loc); 7408 7409 // Create the pre-increment of the iteration variable. 7410 Expr *Increment 7411 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7412 VK_LValue, OK_Ordinary, Loc); 7413 7414 // Subscript the "from" and "to" expressions with the iteration variable. 7415 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7416 IterationVarRefRVal, 7417 Loc)); 7418 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7419 IterationVarRefRVal, 7420 Loc)); 7421 if (!Copying) // Cast to rvalue 7422 From = CastForMoving(S, From); 7423 7424 // Build the copy/move for an individual element of the array. 7425 StmtResult Copy = BuildSingleCopyAssign(S, Loc, ArrayTy->getElementType(), 7426 To, From, CopyingBaseSubobject, 7427 Copying, Depth + 1); 7428 if (Copy.isInvalid()) 7429 return StmtError(); 7430 7431 // Construct the loop that copies all elements of this array. 7432 return S.ActOnForStmt(Loc, Loc, InitStmt, 7433 S.MakeFullExpr(Comparison), 7434 0, S.MakeFullExpr(Increment), 7435 Loc, Copy.take()); 7436} 7437 7438std::pair<Sema::ImplicitExceptionSpecification, bool> 7439Sema::ComputeDefaultedCopyAssignmentExceptionSpecAndConst( 7440 CXXRecordDecl *ClassDecl) { 7441 if (ClassDecl->isInvalidDecl()) 7442 return std::make_pair(ImplicitExceptionSpecification(*this), true); 7443 7444 // C++ [class.copy]p10: 7445 // If the class definition does not explicitly declare a copy 7446 // assignment operator, one is declared implicitly. 7447 // The implicitly-defined copy assignment operator for a class X 7448 // will have the form 7449 // 7450 // X& X::operator=(const X&) 7451 // 7452 // if 7453 bool HasConstCopyAssignment = true; 7454 7455 // -- each direct base class B of X has a copy assignment operator 7456 // whose parameter is of type const B&, const volatile B& or B, 7457 // and 7458 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7459 BaseEnd = ClassDecl->bases_end(); 7460 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7461 // We'll handle this below 7462 if (LangOpts.CPlusPlus0x && Base->isVirtual()) 7463 continue; 7464 7465 assert(!Base->getType()->isDependentType() && 7466 "Cannot generate implicit members for class with dependent bases."); 7467 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7468 HasConstCopyAssignment &= 7469 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7470 false, 0); 7471 } 7472 7473 // In C++11, the above citation has "or virtual" added 7474 if (LangOpts.CPlusPlus0x) { 7475 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7476 BaseEnd = ClassDecl->vbases_end(); 7477 HasConstCopyAssignment && Base != BaseEnd; ++Base) { 7478 assert(!Base->getType()->isDependentType() && 7479 "Cannot generate implicit members for class with dependent bases."); 7480 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7481 HasConstCopyAssignment &= 7482 (bool)LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7483 false, 0); 7484 } 7485 } 7486 7487 // -- for all the nonstatic data members of X that are of a class 7488 // type M (or array thereof), each such class type has a copy 7489 // assignment operator whose parameter is of type const M&, 7490 // const volatile M& or M. 7491 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7492 FieldEnd = ClassDecl->field_end(); 7493 HasConstCopyAssignment && Field != FieldEnd; 7494 ++Field) { 7495 QualType FieldType = Context.getBaseElementType(Field->getType()); 7496 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7497 HasConstCopyAssignment &= 7498 (bool)LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7499 false, 0); 7500 } 7501 } 7502 7503 // Otherwise, the implicitly declared copy assignment operator will 7504 // have the form 7505 // 7506 // X& X::operator=(X&) 7507 7508 // C++ [except.spec]p14: 7509 // An implicitly declared special member function (Clause 12) shall have an 7510 // exception-specification. [...] 7511 7512 // It is unspecified whether or not an implicit copy assignment operator 7513 // attempts to deduplicate calls to assignment operators of virtual bases are 7514 // made. As such, this exception specification is effectively unspecified. 7515 // Based on a similar decision made for constness in C++0x, we're erring on 7516 // the side of assuming such calls to be made regardless of whether they 7517 // actually happen. 7518 ImplicitExceptionSpecification ExceptSpec(*this); 7519 unsigned ArgQuals = HasConstCopyAssignment ? Qualifiers::Const : 0; 7520 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7521 BaseEnd = ClassDecl->bases_end(); 7522 Base != BaseEnd; ++Base) { 7523 if (Base->isVirtual()) 7524 continue; 7525 7526 CXXRecordDecl *BaseClassDecl 7527 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7528 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7529 ArgQuals, false, 0)) 7530 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7531 } 7532 7533 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7534 BaseEnd = ClassDecl->vbases_end(); 7535 Base != BaseEnd; ++Base) { 7536 CXXRecordDecl *BaseClassDecl 7537 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7538 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7539 ArgQuals, false, 0)) 7540 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7541 } 7542 7543 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7544 FieldEnd = ClassDecl->field_end(); 7545 Field != FieldEnd; 7546 ++Field) { 7547 QualType FieldType = Context.getBaseElementType(Field->getType()); 7548 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7549 if (CXXMethodDecl *CopyAssign = 7550 LookupCopyingAssignment(FieldClassDecl, ArgQuals, false, 0)) 7551 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7552 } 7553 } 7554 7555 return std::make_pair(ExceptSpec, HasConstCopyAssignment); 7556} 7557 7558CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7559 // Note: The following rules are largely analoguous to the copy 7560 // constructor rules. Note that virtual bases are not taken into account 7561 // for determining the argument type of the operator. Note also that 7562 // operators taking an object instead of a reference are allowed. 7563 7564 ImplicitExceptionSpecification Spec(*this); 7565 bool Const; 7566 llvm::tie(Spec, Const) = 7567 ComputeDefaultedCopyAssignmentExceptionSpecAndConst(ClassDecl); 7568 7569 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7570 QualType RetType = Context.getLValueReferenceType(ArgType); 7571 if (Const) 7572 ArgType = ArgType.withConst(); 7573 ArgType = Context.getLValueReferenceType(ArgType); 7574 7575 // An implicitly-declared copy assignment operator is an inline public 7576 // member of its class. 7577 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 7578 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7579 SourceLocation ClassLoc = ClassDecl->getLocation(); 7580 DeclarationNameInfo NameInfo(Name, ClassLoc); 7581 CXXMethodDecl *CopyAssignment 7582 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7583 Context.getFunctionType(RetType, &ArgType, 1, EPI), 7584 /*TInfo=*/0, /*isStatic=*/false, 7585 /*StorageClassAsWritten=*/SC_None, 7586 /*isInline=*/true, /*isConstexpr=*/false, 7587 SourceLocation()); 7588 CopyAssignment->setAccess(AS_public); 7589 CopyAssignment->setDefaulted(); 7590 CopyAssignment->setImplicit(); 7591 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7592 7593 // Add the parameter to the operator. 7594 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7595 ClassLoc, ClassLoc, /*Id=*/0, 7596 ArgType, /*TInfo=*/0, 7597 SC_None, 7598 SC_None, 0); 7599 CopyAssignment->setParams(FromParam); 7600 7601 // Note that we have added this copy-assignment operator. 7602 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7603 7604 if (Scope *S = getScopeForContext(ClassDecl)) 7605 PushOnScopeChains(CopyAssignment, S, false); 7606 ClassDecl->addDecl(CopyAssignment); 7607 7608 // C++0x [class.copy]p19: 7609 // .... If the class definition does not explicitly declare a copy 7610 // assignment operator, there is no user-declared move constructor, and 7611 // there is no user-declared move assignment operator, a copy assignment 7612 // operator is implicitly declared as defaulted. 7613 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7614 CopyAssignment->setDeletedAsWritten(); 7615 7616 AddOverriddenMethods(ClassDecl, CopyAssignment); 7617 return CopyAssignment; 7618} 7619 7620void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7621 CXXMethodDecl *CopyAssignOperator) { 7622 assert((CopyAssignOperator->isDefaulted() && 7623 CopyAssignOperator->isOverloadedOperator() && 7624 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7625 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7626 !CopyAssignOperator->isDeleted()) && 7627 "DefineImplicitCopyAssignment called for wrong function"); 7628 7629 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7630 7631 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7632 CopyAssignOperator->setInvalidDecl(); 7633 return; 7634 } 7635 7636 CopyAssignOperator->setUsed(); 7637 7638 ImplicitlyDefinedFunctionScope Scope(*this, CopyAssignOperator); 7639 DiagnosticErrorTrap Trap(Diags); 7640 7641 // C++0x [class.copy]p30: 7642 // The implicitly-defined or explicitly-defaulted copy assignment operator 7643 // for a non-union class X performs memberwise copy assignment of its 7644 // subobjects. The direct base classes of X are assigned first, in the 7645 // order of their declaration in the base-specifier-list, and then the 7646 // immediate non-static data members of X are assigned, in the order in 7647 // which they were declared in the class definition. 7648 7649 // The statements that form the synthesized function body. 7650 ASTOwningVector<Stmt*> Statements(*this); 7651 7652 // The parameter for the "other" object, which we are copying from. 7653 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7654 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7655 QualType OtherRefType = Other->getType(); 7656 if (const LValueReferenceType *OtherRef 7657 = OtherRefType->getAs<LValueReferenceType>()) { 7658 OtherRefType = OtherRef->getPointeeType(); 7659 OtherQuals = OtherRefType.getQualifiers(); 7660 } 7661 7662 // Our location for everything implicitly-generated. 7663 SourceLocation Loc = CopyAssignOperator->getLocation(); 7664 7665 // Construct a reference to the "other" object. We'll be using this 7666 // throughout the generated ASTs. 7667 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7668 assert(OtherRef && "Reference to parameter cannot fail!"); 7669 7670 // Construct the "this" pointer. We'll be using this throughout the generated 7671 // ASTs. 7672 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7673 assert(This && "Reference to this cannot fail!"); 7674 7675 // Assign base classes. 7676 bool Invalid = false; 7677 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7678 E = ClassDecl->bases_end(); Base != E; ++Base) { 7679 // Form the assignment: 7680 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7681 QualType BaseType = Base->getType().getUnqualifiedType(); 7682 if (!BaseType->isRecordType()) { 7683 Invalid = true; 7684 continue; 7685 } 7686 7687 CXXCastPath BasePath; 7688 BasePath.push_back(Base); 7689 7690 // Construct the "from" expression, which is an implicit cast to the 7691 // appropriately-qualified base type. 7692 Expr *From = OtherRef; 7693 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7694 CK_UncheckedDerivedToBase, 7695 VK_LValue, &BasePath).take(); 7696 7697 // Dereference "this". 7698 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7699 7700 // Implicitly cast "this" to the appropriately-qualified base type. 7701 To = ImpCastExprToType(To.take(), 7702 Context.getCVRQualifiedType(BaseType, 7703 CopyAssignOperator->getTypeQualifiers()), 7704 CK_UncheckedDerivedToBase, 7705 VK_LValue, &BasePath); 7706 7707 // Build the copy. 7708 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, BaseType, 7709 To.get(), From, 7710 /*CopyingBaseSubobject=*/true, 7711 /*Copying=*/true); 7712 if (Copy.isInvalid()) { 7713 Diag(CurrentLocation, diag::note_member_synthesized_at) 7714 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7715 CopyAssignOperator->setInvalidDecl(); 7716 return; 7717 } 7718 7719 // Success! Record the copy. 7720 Statements.push_back(Copy.takeAs<Expr>()); 7721 } 7722 7723 // \brief Reference to the __builtin_memcpy function. 7724 Expr *BuiltinMemCpyRef = 0; 7725 // \brief Reference to the __builtin_objc_memmove_collectable function. 7726 Expr *CollectableMemCpyRef = 0; 7727 7728 // Assign non-static members. 7729 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7730 FieldEnd = ClassDecl->field_end(); 7731 Field != FieldEnd; ++Field) { 7732 if (Field->isUnnamedBitfield()) 7733 continue; 7734 7735 // Check for members of reference type; we can't copy those. 7736 if (Field->getType()->isReferenceType()) { 7737 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7738 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 7739 Diag(Field->getLocation(), diag::note_declared_at); 7740 Diag(CurrentLocation, diag::note_member_synthesized_at) 7741 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7742 Invalid = true; 7743 continue; 7744 } 7745 7746 // Check for members of const-qualified, non-class type. 7747 QualType BaseType = Context.getBaseElementType(Field->getType()); 7748 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 7749 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 7750 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 7751 Diag(Field->getLocation(), diag::note_declared_at); 7752 Diag(CurrentLocation, diag::note_member_synthesized_at) 7753 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7754 Invalid = true; 7755 continue; 7756 } 7757 7758 // Suppress assigning zero-width bitfields. 7759 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 7760 continue; 7761 7762 QualType FieldType = Field->getType().getNonReferenceType(); 7763 if (FieldType->isIncompleteArrayType()) { 7764 assert(ClassDecl->hasFlexibleArrayMember() && 7765 "Incomplete array type is not valid"); 7766 continue; 7767 } 7768 7769 // Build references to the field in the object we're copying from and to. 7770 CXXScopeSpec SS; // Intentionally empty 7771 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 7772 LookupMemberName); 7773 MemberLookup.addDecl(*Field); 7774 MemberLookup.resolveKind(); 7775 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 7776 Loc, /*IsArrow=*/false, 7777 SS, SourceLocation(), 0, 7778 MemberLookup, 0); 7779 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 7780 Loc, /*IsArrow=*/true, 7781 SS, SourceLocation(), 0, 7782 MemberLookup, 0); 7783 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 7784 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 7785 7786 // If the field should be copied with __builtin_memcpy rather than via 7787 // explicit assignments, do so. This optimization only applies for arrays 7788 // of scalars and arrays of class type with trivial copy-assignment 7789 // operators. 7790 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 7791 && BaseType.hasTrivialAssignment(Context, /*Copying=*/true)) { 7792 // Compute the size of the memory buffer to be copied. 7793 QualType SizeType = Context.getSizeType(); 7794 llvm::APInt Size(Context.getTypeSize(SizeType), 7795 Context.getTypeSizeInChars(BaseType).getQuantity()); 7796 for (const ConstantArrayType *Array 7797 = Context.getAsConstantArrayType(FieldType); 7798 Array; 7799 Array = Context.getAsConstantArrayType(Array->getElementType())) { 7800 llvm::APInt ArraySize 7801 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 7802 Size *= ArraySize; 7803 } 7804 7805 // Take the address of the field references for "from" and "to". 7806 From = CreateBuiltinUnaryOp(Loc, UO_AddrOf, From.get()); 7807 To = CreateBuiltinUnaryOp(Loc, UO_AddrOf, To.get()); 7808 7809 bool NeedsCollectableMemCpy = 7810 (BaseType->isRecordType() && 7811 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 7812 7813 if (NeedsCollectableMemCpy) { 7814 if (!CollectableMemCpyRef) { 7815 // Create a reference to the __builtin_objc_memmove_collectable function. 7816 LookupResult R(*this, 7817 &Context.Idents.get("__builtin_objc_memmove_collectable"), 7818 Loc, LookupOrdinaryName); 7819 LookupName(R, TUScope, true); 7820 7821 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 7822 if (!CollectableMemCpy) { 7823 // Something went horribly wrong earlier, and we will have 7824 // complained about it. 7825 Invalid = true; 7826 continue; 7827 } 7828 7829 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 7830 CollectableMemCpy->getType(), 7831 VK_LValue, Loc, 0).take(); 7832 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 7833 } 7834 } 7835 // Create a reference to the __builtin_memcpy builtin function. 7836 else if (!BuiltinMemCpyRef) { 7837 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 7838 LookupOrdinaryName); 7839 LookupName(R, TUScope, true); 7840 7841 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 7842 if (!BuiltinMemCpy) { 7843 // Something went horribly wrong earlier, and we will have complained 7844 // about it. 7845 Invalid = true; 7846 continue; 7847 } 7848 7849 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 7850 BuiltinMemCpy->getType(), 7851 VK_LValue, Loc, 0).take(); 7852 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 7853 } 7854 7855 ASTOwningVector<Expr*> CallArgs(*this); 7856 CallArgs.push_back(To.takeAs<Expr>()); 7857 CallArgs.push_back(From.takeAs<Expr>()); 7858 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 7859 ExprResult Call = ExprError(); 7860 if (NeedsCollectableMemCpy) 7861 Call = ActOnCallExpr(/*Scope=*/0, 7862 CollectableMemCpyRef, 7863 Loc, move_arg(CallArgs), 7864 Loc); 7865 else 7866 Call = ActOnCallExpr(/*Scope=*/0, 7867 BuiltinMemCpyRef, 7868 Loc, move_arg(CallArgs), 7869 Loc); 7870 7871 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7872 Statements.push_back(Call.takeAs<Expr>()); 7873 continue; 7874 } 7875 7876 // Build the copy of this field. 7877 StmtResult Copy = BuildSingleCopyAssign(*this, Loc, FieldType, 7878 To.get(), From.get(), 7879 /*CopyingBaseSubobject=*/false, 7880 /*Copying=*/true); 7881 if (Copy.isInvalid()) { 7882 Diag(CurrentLocation, diag::note_member_synthesized_at) 7883 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7884 CopyAssignOperator->setInvalidDecl(); 7885 return; 7886 } 7887 7888 // Success! Record the copy. 7889 Statements.push_back(Copy.takeAs<Stmt>()); 7890 } 7891 7892 if (!Invalid) { 7893 // Add a "return *this;" 7894 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7895 7896 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 7897 if (Return.isInvalid()) 7898 Invalid = true; 7899 else { 7900 Statements.push_back(Return.takeAs<Stmt>()); 7901 7902 if (Trap.hasErrorOccurred()) { 7903 Diag(CurrentLocation, diag::note_member_synthesized_at) 7904 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 7905 Invalid = true; 7906 } 7907 } 7908 } 7909 7910 if (Invalid) { 7911 CopyAssignOperator->setInvalidDecl(); 7912 return; 7913 } 7914 7915 StmtResult Body; 7916 { 7917 CompoundScopeRAII CompoundScope(*this); 7918 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 7919 /*isStmtExpr=*/false); 7920 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 7921 } 7922 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 7923 7924 if (ASTMutationListener *L = getASTMutationListener()) { 7925 L->CompletedImplicitDefinition(CopyAssignOperator); 7926 } 7927} 7928 7929Sema::ImplicitExceptionSpecification 7930Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXRecordDecl *ClassDecl) { 7931 ImplicitExceptionSpecification ExceptSpec(*this); 7932 7933 if (ClassDecl->isInvalidDecl()) 7934 return ExceptSpec; 7935 7936 // C++0x [except.spec]p14: 7937 // An implicitly declared special member function (Clause 12) shall have an 7938 // exception-specification. [...] 7939 7940 // It is unspecified whether or not an implicit move assignment operator 7941 // attempts to deduplicate calls to assignment operators of virtual bases are 7942 // made. As such, this exception specification is effectively unspecified. 7943 // Based on a similar decision made for constness in C++0x, we're erring on 7944 // the side of assuming such calls to be made regardless of whether they 7945 // actually happen. 7946 // Note that a move constructor is not implicitly declared when there are 7947 // virtual bases, but it can still be user-declared and explicitly defaulted. 7948 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7949 BaseEnd = ClassDecl->bases_end(); 7950 Base != BaseEnd; ++Base) { 7951 if (Base->isVirtual()) 7952 continue; 7953 7954 CXXRecordDecl *BaseClassDecl 7955 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7956 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7957 false, 0)) 7958 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7959 } 7960 7961 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7962 BaseEnd = ClassDecl->vbases_end(); 7963 Base != BaseEnd; ++Base) { 7964 CXXRecordDecl *BaseClassDecl 7965 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7966 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 7967 false, 0)) 7968 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 7969 } 7970 7971 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7972 FieldEnd = ClassDecl->field_end(); 7973 Field != FieldEnd; 7974 ++Field) { 7975 QualType FieldType = Context.getBaseElementType(Field->getType()); 7976 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7977 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(FieldClassDecl, 7978 false, 0)) 7979 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 7980 } 7981 } 7982 7983 return ExceptSpec; 7984} 7985 7986/// Determine whether the class type has any direct or indirect virtual base 7987/// classes which have a non-trivial move assignment operator. 7988static bool 7989hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 7990 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7991 BaseEnd = ClassDecl->vbases_end(); 7992 Base != BaseEnd; ++Base) { 7993 CXXRecordDecl *BaseClass = 7994 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7995 7996 // Try to declare the move assignment. If it would be deleted, then the 7997 // class does not have a non-trivial move assignment. 7998 if (BaseClass->needsImplicitMoveAssignment()) 7999 S.DeclareImplicitMoveAssignment(BaseClass); 8000 8001 // If the class has both a trivial move assignment and a non-trivial move 8002 // assignment, hasTrivialMoveAssignment() is false. 8003 if (BaseClass->hasDeclaredMoveAssignment() && 8004 !BaseClass->hasTrivialMoveAssignment()) 8005 return true; 8006 } 8007 8008 return false; 8009} 8010 8011/// Determine whether the given type either has a move constructor or is 8012/// trivially copyable. 8013static bool 8014hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8015 Type = S.Context.getBaseElementType(Type); 8016 8017 // FIXME: Technically, non-trivially-copyable non-class types, such as 8018 // reference types, are supposed to return false here, but that appears 8019 // to be a standard defect. 8020 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8021 if (!ClassDecl || !ClassDecl->getDefinition()) 8022 return true; 8023 8024 if (Type.isTriviallyCopyableType(S.Context)) 8025 return true; 8026 8027 if (IsConstructor) { 8028 if (ClassDecl->needsImplicitMoveConstructor()) 8029 S.DeclareImplicitMoveConstructor(ClassDecl); 8030 return ClassDecl->hasDeclaredMoveConstructor(); 8031 } 8032 8033 if (ClassDecl->needsImplicitMoveAssignment()) 8034 S.DeclareImplicitMoveAssignment(ClassDecl); 8035 return ClassDecl->hasDeclaredMoveAssignment(); 8036} 8037 8038/// Determine whether all non-static data members and direct or virtual bases 8039/// of class \p ClassDecl have either a move operation, or are trivially 8040/// copyable. 8041static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8042 bool IsConstructor) { 8043 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8044 BaseEnd = ClassDecl->bases_end(); 8045 Base != BaseEnd; ++Base) { 8046 if (Base->isVirtual()) 8047 continue; 8048 8049 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8050 return false; 8051 } 8052 8053 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8054 BaseEnd = ClassDecl->vbases_end(); 8055 Base != BaseEnd; ++Base) { 8056 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8057 return false; 8058 } 8059 8060 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8061 FieldEnd = ClassDecl->field_end(); 8062 Field != FieldEnd; ++Field) { 8063 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8064 return false; 8065 } 8066 8067 return true; 8068} 8069 8070CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8071 // C++11 [class.copy]p20: 8072 // If the definition of a class X does not explicitly declare a move 8073 // assignment operator, one will be implicitly declared as defaulted 8074 // if and only if: 8075 // 8076 // - [first 4 bullets] 8077 assert(ClassDecl->needsImplicitMoveAssignment()); 8078 8079 // [Checked after we build the declaration] 8080 // - the move assignment operator would not be implicitly defined as 8081 // deleted, 8082 8083 // [DR1402]: 8084 // - X has no direct or indirect virtual base class with a non-trivial 8085 // move assignment operator, and 8086 // - each of X's non-static data members and direct or virtual base classes 8087 // has a type that either has a move assignment operator or is trivially 8088 // copyable. 8089 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8090 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8091 ClassDecl->setFailedImplicitMoveAssignment(); 8092 return 0; 8093 } 8094 8095 // Note: The following rules are largely analoguous to the move 8096 // constructor rules. 8097 8098 ImplicitExceptionSpecification Spec( 8099 ComputeDefaultedMoveAssignmentExceptionSpec(ClassDecl)); 8100 8101 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8102 QualType RetType = Context.getLValueReferenceType(ArgType); 8103 ArgType = Context.getRValueReferenceType(ArgType); 8104 8105 // An implicitly-declared move assignment operator is an inline public 8106 // member of its class. 8107 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8108 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8109 SourceLocation ClassLoc = ClassDecl->getLocation(); 8110 DeclarationNameInfo NameInfo(Name, ClassLoc); 8111 CXXMethodDecl *MoveAssignment 8112 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8113 Context.getFunctionType(RetType, &ArgType, 1, EPI), 8114 /*TInfo=*/0, /*isStatic=*/false, 8115 /*StorageClassAsWritten=*/SC_None, 8116 /*isInline=*/true, 8117 /*isConstexpr=*/false, 8118 SourceLocation()); 8119 MoveAssignment->setAccess(AS_public); 8120 MoveAssignment->setDefaulted(); 8121 MoveAssignment->setImplicit(); 8122 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8123 8124 // Add the parameter to the operator. 8125 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8126 ClassLoc, ClassLoc, /*Id=*/0, 8127 ArgType, /*TInfo=*/0, 8128 SC_None, 8129 SC_None, 0); 8130 MoveAssignment->setParams(FromParam); 8131 8132 // Note that we have added this copy-assignment operator. 8133 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8134 8135 // C++0x [class.copy]p9: 8136 // If the definition of a class X does not explicitly declare a move 8137 // assignment operator, one will be implicitly declared as defaulted if and 8138 // only if: 8139 // [...] 8140 // - the move assignment operator would not be implicitly defined as 8141 // deleted. 8142 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8143 // Cache this result so that we don't try to generate this over and over 8144 // on every lookup, leaking memory and wasting time. 8145 ClassDecl->setFailedImplicitMoveAssignment(); 8146 return 0; 8147 } 8148 8149 if (Scope *S = getScopeForContext(ClassDecl)) 8150 PushOnScopeChains(MoveAssignment, S, false); 8151 ClassDecl->addDecl(MoveAssignment); 8152 8153 AddOverriddenMethods(ClassDecl, MoveAssignment); 8154 return MoveAssignment; 8155} 8156 8157void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8158 CXXMethodDecl *MoveAssignOperator) { 8159 assert((MoveAssignOperator->isDefaulted() && 8160 MoveAssignOperator->isOverloadedOperator() && 8161 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8162 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8163 !MoveAssignOperator->isDeleted()) && 8164 "DefineImplicitMoveAssignment called for wrong function"); 8165 8166 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8167 8168 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8169 MoveAssignOperator->setInvalidDecl(); 8170 return; 8171 } 8172 8173 MoveAssignOperator->setUsed(); 8174 8175 ImplicitlyDefinedFunctionScope Scope(*this, MoveAssignOperator); 8176 DiagnosticErrorTrap Trap(Diags); 8177 8178 // C++0x [class.copy]p28: 8179 // The implicitly-defined or move assignment operator for a non-union class 8180 // X performs memberwise move assignment of its subobjects. The direct base 8181 // classes of X are assigned first, in the order of their declaration in the 8182 // base-specifier-list, and then the immediate non-static data members of X 8183 // are assigned, in the order in which they were declared in the class 8184 // definition. 8185 8186 // The statements that form the synthesized function body. 8187 ASTOwningVector<Stmt*> Statements(*this); 8188 8189 // The parameter for the "other" object, which we are move from. 8190 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8191 QualType OtherRefType = Other->getType()-> 8192 getAs<RValueReferenceType>()->getPointeeType(); 8193 assert(OtherRefType.getQualifiers() == 0 && 8194 "Bad argument type of defaulted move assignment"); 8195 8196 // Our location for everything implicitly-generated. 8197 SourceLocation Loc = MoveAssignOperator->getLocation(); 8198 8199 // Construct a reference to the "other" object. We'll be using this 8200 // throughout the generated ASTs. 8201 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8202 assert(OtherRef && "Reference to parameter cannot fail!"); 8203 // Cast to rvalue. 8204 OtherRef = CastForMoving(*this, OtherRef); 8205 8206 // Construct the "this" pointer. We'll be using this throughout the generated 8207 // ASTs. 8208 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8209 assert(This && "Reference to this cannot fail!"); 8210 8211 // Assign base classes. 8212 bool Invalid = false; 8213 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8214 E = ClassDecl->bases_end(); Base != E; ++Base) { 8215 // Form the assignment: 8216 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8217 QualType BaseType = Base->getType().getUnqualifiedType(); 8218 if (!BaseType->isRecordType()) { 8219 Invalid = true; 8220 continue; 8221 } 8222 8223 CXXCastPath BasePath; 8224 BasePath.push_back(Base); 8225 8226 // Construct the "from" expression, which is an implicit cast to the 8227 // appropriately-qualified base type. 8228 Expr *From = OtherRef; 8229 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8230 VK_XValue, &BasePath).take(); 8231 8232 // Dereference "this". 8233 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8234 8235 // Implicitly cast "this" to the appropriately-qualified base type. 8236 To = ImpCastExprToType(To.take(), 8237 Context.getCVRQualifiedType(BaseType, 8238 MoveAssignOperator->getTypeQualifiers()), 8239 CK_UncheckedDerivedToBase, 8240 VK_LValue, &BasePath); 8241 8242 // Build the move. 8243 StmtResult Move = BuildSingleCopyAssign(*this, Loc, BaseType, 8244 To.get(), From, 8245 /*CopyingBaseSubobject=*/true, 8246 /*Copying=*/false); 8247 if (Move.isInvalid()) { 8248 Diag(CurrentLocation, diag::note_member_synthesized_at) 8249 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8250 MoveAssignOperator->setInvalidDecl(); 8251 return; 8252 } 8253 8254 // Success! Record the move. 8255 Statements.push_back(Move.takeAs<Expr>()); 8256 } 8257 8258 // \brief Reference to the __builtin_memcpy function. 8259 Expr *BuiltinMemCpyRef = 0; 8260 // \brief Reference to the __builtin_objc_memmove_collectable function. 8261 Expr *CollectableMemCpyRef = 0; 8262 8263 // Assign non-static members. 8264 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8265 FieldEnd = ClassDecl->field_end(); 8266 Field != FieldEnd; ++Field) { 8267 if (Field->isUnnamedBitfield()) 8268 continue; 8269 8270 // Check for members of reference type; we can't move those. 8271 if (Field->getType()->isReferenceType()) { 8272 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8273 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8274 Diag(Field->getLocation(), diag::note_declared_at); 8275 Diag(CurrentLocation, diag::note_member_synthesized_at) 8276 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8277 Invalid = true; 8278 continue; 8279 } 8280 8281 // Check for members of const-qualified, non-class type. 8282 QualType BaseType = Context.getBaseElementType(Field->getType()); 8283 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8284 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8285 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8286 Diag(Field->getLocation(), diag::note_declared_at); 8287 Diag(CurrentLocation, diag::note_member_synthesized_at) 8288 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8289 Invalid = true; 8290 continue; 8291 } 8292 8293 // Suppress assigning zero-width bitfields. 8294 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8295 continue; 8296 8297 QualType FieldType = Field->getType().getNonReferenceType(); 8298 if (FieldType->isIncompleteArrayType()) { 8299 assert(ClassDecl->hasFlexibleArrayMember() && 8300 "Incomplete array type is not valid"); 8301 continue; 8302 } 8303 8304 // Build references to the field in the object we're copying from and to. 8305 CXXScopeSpec SS; // Intentionally empty 8306 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8307 LookupMemberName); 8308 MemberLookup.addDecl(*Field); 8309 MemberLookup.resolveKind(); 8310 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8311 Loc, /*IsArrow=*/false, 8312 SS, SourceLocation(), 0, 8313 MemberLookup, 0); 8314 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8315 Loc, /*IsArrow=*/true, 8316 SS, SourceLocation(), 0, 8317 MemberLookup, 0); 8318 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8319 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8320 8321 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8322 "Member reference with rvalue base must be rvalue except for reference " 8323 "members, which aren't allowed for move assignment."); 8324 8325 // If the field should be copied with __builtin_memcpy rather than via 8326 // explicit assignments, do so. This optimization only applies for arrays 8327 // of scalars and arrays of class type with trivial move-assignment 8328 // operators. 8329 if (FieldType->isArrayType() && !FieldType.isVolatileQualified() 8330 && BaseType.hasTrivialAssignment(Context, /*Copying=*/false)) { 8331 // Compute the size of the memory buffer to be copied. 8332 QualType SizeType = Context.getSizeType(); 8333 llvm::APInt Size(Context.getTypeSize(SizeType), 8334 Context.getTypeSizeInChars(BaseType).getQuantity()); 8335 for (const ConstantArrayType *Array 8336 = Context.getAsConstantArrayType(FieldType); 8337 Array; 8338 Array = Context.getAsConstantArrayType(Array->getElementType())) { 8339 llvm::APInt ArraySize 8340 = Array->getSize().zextOrTrunc(Size.getBitWidth()); 8341 Size *= ArraySize; 8342 } 8343 8344 // Take the address of the field references for "from" and "to". We 8345 // directly construct UnaryOperators here because semantic analysis 8346 // does not permit us to take the address of an xvalue. 8347 From = new (Context) UnaryOperator(From.get(), UO_AddrOf, 8348 Context.getPointerType(From.get()->getType()), 8349 VK_RValue, OK_Ordinary, Loc); 8350 To = new (Context) UnaryOperator(To.get(), UO_AddrOf, 8351 Context.getPointerType(To.get()->getType()), 8352 VK_RValue, OK_Ordinary, Loc); 8353 8354 bool NeedsCollectableMemCpy = 8355 (BaseType->isRecordType() && 8356 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()); 8357 8358 if (NeedsCollectableMemCpy) { 8359 if (!CollectableMemCpyRef) { 8360 // Create a reference to the __builtin_objc_memmove_collectable function. 8361 LookupResult R(*this, 8362 &Context.Idents.get("__builtin_objc_memmove_collectable"), 8363 Loc, LookupOrdinaryName); 8364 LookupName(R, TUScope, true); 8365 8366 FunctionDecl *CollectableMemCpy = R.getAsSingle<FunctionDecl>(); 8367 if (!CollectableMemCpy) { 8368 // Something went horribly wrong earlier, and we will have 8369 // complained about it. 8370 Invalid = true; 8371 continue; 8372 } 8373 8374 CollectableMemCpyRef = BuildDeclRefExpr(CollectableMemCpy, 8375 CollectableMemCpy->getType(), 8376 VK_LValue, Loc, 0).take(); 8377 assert(CollectableMemCpyRef && "Builtin reference cannot fail"); 8378 } 8379 } 8380 // Create a reference to the __builtin_memcpy builtin function. 8381 else if (!BuiltinMemCpyRef) { 8382 LookupResult R(*this, &Context.Idents.get("__builtin_memcpy"), Loc, 8383 LookupOrdinaryName); 8384 LookupName(R, TUScope, true); 8385 8386 FunctionDecl *BuiltinMemCpy = R.getAsSingle<FunctionDecl>(); 8387 if (!BuiltinMemCpy) { 8388 // Something went horribly wrong earlier, and we will have complained 8389 // about it. 8390 Invalid = true; 8391 continue; 8392 } 8393 8394 BuiltinMemCpyRef = BuildDeclRefExpr(BuiltinMemCpy, 8395 BuiltinMemCpy->getType(), 8396 VK_LValue, Loc, 0).take(); 8397 assert(BuiltinMemCpyRef && "Builtin reference cannot fail"); 8398 } 8399 8400 ASTOwningVector<Expr*> CallArgs(*this); 8401 CallArgs.push_back(To.takeAs<Expr>()); 8402 CallArgs.push_back(From.takeAs<Expr>()); 8403 CallArgs.push_back(IntegerLiteral::Create(Context, Size, SizeType, Loc)); 8404 ExprResult Call = ExprError(); 8405 if (NeedsCollectableMemCpy) 8406 Call = ActOnCallExpr(/*Scope=*/0, 8407 CollectableMemCpyRef, 8408 Loc, move_arg(CallArgs), 8409 Loc); 8410 else 8411 Call = ActOnCallExpr(/*Scope=*/0, 8412 BuiltinMemCpyRef, 8413 Loc, move_arg(CallArgs), 8414 Loc); 8415 8416 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8417 Statements.push_back(Call.takeAs<Expr>()); 8418 continue; 8419 } 8420 8421 // Build the move of this field. 8422 StmtResult Move = BuildSingleCopyAssign(*this, Loc, FieldType, 8423 To.get(), From.get(), 8424 /*CopyingBaseSubobject=*/false, 8425 /*Copying=*/false); 8426 if (Move.isInvalid()) { 8427 Diag(CurrentLocation, diag::note_member_synthesized_at) 8428 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8429 MoveAssignOperator->setInvalidDecl(); 8430 return; 8431 } 8432 8433 // Success! Record the copy. 8434 Statements.push_back(Move.takeAs<Stmt>()); 8435 } 8436 8437 if (!Invalid) { 8438 // Add a "return *this;" 8439 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8440 8441 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8442 if (Return.isInvalid()) 8443 Invalid = true; 8444 else { 8445 Statements.push_back(Return.takeAs<Stmt>()); 8446 8447 if (Trap.hasErrorOccurred()) { 8448 Diag(CurrentLocation, diag::note_member_synthesized_at) 8449 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8450 Invalid = true; 8451 } 8452 } 8453 } 8454 8455 if (Invalid) { 8456 MoveAssignOperator->setInvalidDecl(); 8457 return; 8458 } 8459 8460 StmtResult Body; 8461 { 8462 CompoundScopeRAII CompoundScope(*this); 8463 Body = ActOnCompoundStmt(Loc, Loc, move_arg(Statements), 8464 /*isStmtExpr=*/false); 8465 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8466 } 8467 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8468 8469 if (ASTMutationListener *L = getASTMutationListener()) { 8470 L->CompletedImplicitDefinition(MoveAssignOperator); 8471 } 8472} 8473 8474std::pair<Sema::ImplicitExceptionSpecification, bool> 8475Sema::ComputeDefaultedCopyCtorExceptionSpecAndConst(CXXRecordDecl *ClassDecl) { 8476 if (ClassDecl->isInvalidDecl()) 8477 return std::make_pair(ImplicitExceptionSpecification(*this), true); 8478 8479 // C++ [class.copy]p5: 8480 // The implicitly-declared copy constructor for a class X will 8481 // have the form 8482 // 8483 // X::X(const X&) 8484 // 8485 // if 8486 // FIXME: It ought to be possible to store this on the record. 8487 bool HasConstCopyConstructor = true; 8488 8489 // -- each direct or virtual base class B of X has a copy 8490 // constructor whose first parameter is of type const B& or 8491 // const volatile B&, and 8492 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8493 BaseEnd = ClassDecl->bases_end(); 8494 HasConstCopyConstructor && Base != BaseEnd; 8495 ++Base) { 8496 // Virtual bases are handled below. 8497 if (Base->isVirtual()) 8498 continue; 8499 8500 CXXRecordDecl *BaseClassDecl 8501 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8502 HasConstCopyConstructor &= 8503 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8504 } 8505 8506 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8507 BaseEnd = ClassDecl->vbases_end(); 8508 HasConstCopyConstructor && Base != BaseEnd; 8509 ++Base) { 8510 CXXRecordDecl *BaseClassDecl 8511 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8512 HasConstCopyConstructor &= 8513 (bool)LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const); 8514 } 8515 8516 // -- for all the nonstatic data members of X that are of a 8517 // class type M (or array thereof), each such class type 8518 // has a copy constructor whose first parameter is of type 8519 // const M& or const volatile M&. 8520 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8521 FieldEnd = ClassDecl->field_end(); 8522 HasConstCopyConstructor && Field != FieldEnd; 8523 ++Field) { 8524 QualType FieldType = Context.getBaseElementType(Field->getType()); 8525 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8526 HasConstCopyConstructor &= 8527 (bool)LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const); 8528 } 8529 } 8530 // Otherwise, the implicitly declared copy constructor will have 8531 // the form 8532 // 8533 // X::X(X&) 8534 8535 // C++ [except.spec]p14: 8536 // An implicitly declared special member function (Clause 12) shall have an 8537 // exception-specification. [...] 8538 ImplicitExceptionSpecification ExceptSpec(*this); 8539 unsigned Quals = HasConstCopyConstructor? Qualifiers::Const : 0; 8540 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8541 BaseEnd = ClassDecl->bases_end(); 8542 Base != BaseEnd; 8543 ++Base) { 8544 // Virtual bases are handled below. 8545 if (Base->isVirtual()) 8546 continue; 8547 8548 CXXRecordDecl *BaseClassDecl 8549 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8550 if (CXXConstructorDecl *CopyConstructor = 8551 LookupCopyingConstructor(BaseClassDecl, Quals)) 8552 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8553 } 8554 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8555 BaseEnd = ClassDecl->vbases_end(); 8556 Base != BaseEnd; 8557 ++Base) { 8558 CXXRecordDecl *BaseClassDecl 8559 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8560 if (CXXConstructorDecl *CopyConstructor = 8561 LookupCopyingConstructor(BaseClassDecl, Quals)) 8562 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8563 } 8564 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8565 FieldEnd = ClassDecl->field_end(); 8566 Field != FieldEnd; 8567 ++Field) { 8568 QualType FieldType = Context.getBaseElementType(Field->getType()); 8569 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8570 if (CXXConstructorDecl *CopyConstructor = 8571 LookupCopyingConstructor(FieldClassDecl, Quals)) 8572 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8573 } 8574 } 8575 8576 return std::make_pair(ExceptSpec, HasConstCopyConstructor); 8577} 8578 8579CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8580 CXXRecordDecl *ClassDecl) { 8581 // C++ [class.copy]p4: 8582 // If the class definition does not explicitly declare a copy 8583 // constructor, one is declared implicitly. 8584 8585 ImplicitExceptionSpecification Spec(*this); 8586 bool Const; 8587 llvm::tie(Spec, Const) = 8588 ComputeDefaultedCopyCtorExceptionSpecAndConst(ClassDecl); 8589 8590 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8591 QualType ArgType = ClassType; 8592 if (Const) 8593 ArgType = ArgType.withConst(); 8594 ArgType = Context.getLValueReferenceType(ArgType); 8595 8596 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8597 8598 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8599 CXXCopyConstructor, 8600 Const); 8601 8602 DeclarationName Name 8603 = Context.DeclarationNames.getCXXConstructorName( 8604 Context.getCanonicalType(ClassType)); 8605 SourceLocation ClassLoc = ClassDecl->getLocation(); 8606 DeclarationNameInfo NameInfo(Name, ClassLoc); 8607 8608 // An implicitly-declared copy constructor is an inline public 8609 // member of its class. 8610 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8611 Context, ClassDecl, ClassLoc, NameInfo, 8612 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8613 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8614 Constexpr); 8615 CopyConstructor->setAccess(AS_public); 8616 CopyConstructor->setDefaulted(); 8617 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8618 8619 // Note that we have declared this constructor. 8620 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8621 8622 // Add the parameter to the constructor. 8623 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8624 ClassLoc, ClassLoc, 8625 /*IdentifierInfo=*/0, 8626 ArgType, /*TInfo=*/0, 8627 SC_None, 8628 SC_None, 0); 8629 CopyConstructor->setParams(FromParam); 8630 8631 if (Scope *S = getScopeForContext(ClassDecl)) 8632 PushOnScopeChains(CopyConstructor, S, false); 8633 ClassDecl->addDecl(CopyConstructor); 8634 8635 // C++11 [class.copy]p8: 8636 // ... If the class definition does not explicitly declare a copy 8637 // constructor, there is no user-declared move constructor, and there is no 8638 // user-declared move assignment operator, a copy constructor is implicitly 8639 // declared as defaulted. 8640 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8641 CopyConstructor->setDeletedAsWritten(); 8642 8643 return CopyConstructor; 8644} 8645 8646void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8647 CXXConstructorDecl *CopyConstructor) { 8648 assert((CopyConstructor->isDefaulted() && 8649 CopyConstructor->isCopyConstructor() && 8650 !CopyConstructor->doesThisDeclarationHaveABody() && 8651 !CopyConstructor->isDeleted()) && 8652 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8653 8654 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8655 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8656 8657 ImplicitlyDefinedFunctionScope Scope(*this, CopyConstructor); 8658 DiagnosticErrorTrap Trap(Diags); 8659 8660 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8661 Trap.hasErrorOccurred()) { 8662 Diag(CurrentLocation, diag::note_member_synthesized_at) 8663 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8664 CopyConstructor->setInvalidDecl(); 8665 } else { 8666 Sema::CompoundScopeRAII CompoundScope(*this); 8667 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8668 CopyConstructor->getLocation(), 8669 MultiStmtArg(*this, 0, 0), 8670 /*isStmtExpr=*/false) 8671 .takeAs<Stmt>()); 8672 CopyConstructor->setImplicitlyDefined(true); 8673 } 8674 8675 CopyConstructor->setUsed(); 8676 if (ASTMutationListener *L = getASTMutationListener()) { 8677 L->CompletedImplicitDefinition(CopyConstructor); 8678 } 8679} 8680 8681Sema::ImplicitExceptionSpecification 8682Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXRecordDecl *ClassDecl) { 8683 // C++ [except.spec]p14: 8684 // An implicitly declared special member function (Clause 12) shall have an 8685 // exception-specification. [...] 8686 ImplicitExceptionSpecification ExceptSpec(*this); 8687 if (ClassDecl->isInvalidDecl()) 8688 return ExceptSpec; 8689 8690 // Direct base-class constructors. 8691 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8692 BEnd = ClassDecl->bases_end(); 8693 B != BEnd; ++B) { 8694 if (B->isVirtual()) // Handled below. 8695 continue; 8696 8697 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8698 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8699 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8700 // If this is a deleted function, add it anyway. This might be conformant 8701 // with the standard. This might not. I'm not sure. It might not matter. 8702 if (Constructor) 8703 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8704 } 8705 } 8706 8707 // Virtual base-class constructors. 8708 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8709 BEnd = ClassDecl->vbases_end(); 8710 B != BEnd; ++B) { 8711 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8712 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8713 CXXConstructorDecl *Constructor = LookupMovingConstructor(BaseClassDecl); 8714 // If this is a deleted function, add it anyway. This might be conformant 8715 // with the standard. This might not. I'm not sure. It might not matter. 8716 if (Constructor) 8717 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8718 } 8719 } 8720 8721 // Field constructors. 8722 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8723 FEnd = ClassDecl->field_end(); 8724 F != FEnd; ++F) { 8725 if (const RecordType *RecordTy 8726 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8727 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8728 CXXConstructorDecl *Constructor = LookupMovingConstructor(FieldRecDecl); 8729 // If this is a deleted function, add it anyway. This might be conformant 8730 // with the standard. This might not. I'm not sure. It might not matter. 8731 // In particular, the problem is that this function never gets called. It 8732 // might just be ill-formed because this function attempts to refer to 8733 // a deleted function here. 8734 if (Constructor) 8735 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8736 } 8737 } 8738 8739 return ExceptSpec; 8740} 8741 8742CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8743 CXXRecordDecl *ClassDecl) { 8744 // C++11 [class.copy]p9: 8745 // If the definition of a class X does not explicitly declare a move 8746 // constructor, one will be implicitly declared as defaulted if and only if: 8747 // 8748 // - [first 4 bullets] 8749 assert(ClassDecl->needsImplicitMoveConstructor()); 8750 8751 // [Checked after we build the declaration] 8752 // - the move assignment operator would not be implicitly defined as 8753 // deleted, 8754 8755 // [DR1402]: 8756 // - each of X's non-static data members and direct or virtual base classes 8757 // has a type that either has a move constructor or is trivially copyable. 8758 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8759 ClassDecl->setFailedImplicitMoveConstructor(); 8760 return 0; 8761 } 8762 8763 ImplicitExceptionSpecification Spec( 8764 ComputeDefaultedMoveCtorExceptionSpec(ClassDecl)); 8765 8766 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8767 QualType ArgType = Context.getRValueReferenceType(ClassType); 8768 8769 FunctionProtoType::ExtProtoInfo EPI = Spec.getEPI(); 8770 8771 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8772 CXXMoveConstructor, 8773 false); 8774 8775 DeclarationName Name 8776 = Context.DeclarationNames.getCXXConstructorName( 8777 Context.getCanonicalType(ClassType)); 8778 SourceLocation ClassLoc = ClassDecl->getLocation(); 8779 DeclarationNameInfo NameInfo(Name, ClassLoc); 8780 8781 // C++0x [class.copy]p11: 8782 // An implicitly-declared copy/move constructor is an inline public 8783 // member of its class. 8784 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8785 Context, ClassDecl, ClassLoc, NameInfo, 8786 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI), /*TInfo=*/0, 8787 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8788 Constexpr); 8789 MoveConstructor->setAccess(AS_public); 8790 MoveConstructor->setDefaulted(); 8791 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8792 8793 // Add the parameter to the constructor. 8794 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8795 ClassLoc, ClassLoc, 8796 /*IdentifierInfo=*/0, 8797 ArgType, /*TInfo=*/0, 8798 SC_None, 8799 SC_None, 0); 8800 MoveConstructor->setParams(FromParam); 8801 8802 // C++0x [class.copy]p9: 8803 // If the definition of a class X does not explicitly declare a move 8804 // constructor, one will be implicitly declared as defaulted if and only if: 8805 // [...] 8806 // - the move constructor would not be implicitly defined as deleted. 8807 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8808 // Cache this result so that we don't try to generate this over and over 8809 // on every lookup, leaking memory and wasting time. 8810 ClassDecl->setFailedImplicitMoveConstructor(); 8811 return 0; 8812 } 8813 8814 // Note that we have declared this constructor. 8815 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8816 8817 if (Scope *S = getScopeForContext(ClassDecl)) 8818 PushOnScopeChains(MoveConstructor, S, false); 8819 ClassDecl->addDecl(MoveConstructor); 8820 8821 return MoveConstructor; 8822} 8823 8824void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8825 CXXConstructorDecl *MoveConstructor) { 8826 assert((MoveConstructor->isDefaulted() && 8827 MoveConstructor->isMoveConstructor() && 8828 !MoveConstructor->doesThisDeclarationHaveABody() && 8829 !MoveConstructor->isDeleted()) && 8830 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8831 8832 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8833 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8834 8835 ImplicitlyDefinedFunctionScope Scope(*this, MoveConstructor); 8836 DiagnosticErrorTrap Trap(Diags); 8837 8838 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8839 Trap.hasErrorOccurred()) { 8840 Diag(CurrentLocation, diag::note_member_synthesized_at) 8841 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8842 MoveConstructor->setInvalidDecl(); 8843 } else { 8844 Sema::CompoundScopeRAII CompoundScope(*this); 8845 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8846 MoveConstructor->getLocation(), 8847 MultiStmtArg(*this, 0, 0), 8848 /*isStmtExpr=*/false) 8849 .takeAs<Stmt>()); 8850 MoveConstructor->setImplicitlyDefined(true); 8851 } 8852 8853 MoveConstructor->setUsed(); 8854 8855 if (ASTMutationListener *L = getASTMutationListener()) { 8856 L->CompletedImplicitDefinition(MoveConstructor); 8857 } 8858} 8859 8860bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8861 return FD->isDeleted() && 8862 (FD->isDefaulted() || FD->isImplicit()) && 8863 isa<CXXMethodDecl>(FD); 8864} 8865 8866/// \brief Mark the call operator of the given lambda closure type as "used". 8867static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8868 CXXMethodDecl *CallOperator 8869 = cast<CXXMethodDecl>( 8870 *Lambda->lookup( 8871 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8872 CallOperator->setReferenced(); 8873 CallOperator->setUsed(); 8874} 8875 8876void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8877 SourceLocation CurrentLocation, 8878 CXXConversionDecl *Conv) 8879{ 8880 CXXRecordDecl *Lambda = Conv->getParent(); 8881 8882 // Make sure that the lambda call operator is marked used. 8883 markLambdaCallOperatorUsed(*this, Lambda); 8884 8885 Conv->setUsed(); 8886 8887 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8888 DiagnosticErrorTrap Trap(Diags); 8889 8890 // Return the address of the __invoke function. 8891 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 8892 CXXMethodDecl *Invoke 8893 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 8894 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 8895 VK_LValue, Conv->getLocation()).take(); 8896 assert(FunctionRef && "Can't refer to __invoke function?"); 8897 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 8898 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 8899 Conv->getLocation(), 8900 Conv->getLocation())); 8901 8902 // Fill in the __invoke function with a dummy implementation. IR generation 8903 // will fill in the actual details. 8904 Invoke->setUsed(); 8905 Invoke->setReferenced(); 8906 Invoke->setBody(new (Context) CompoundStmt(Context, 0, 0, Conv->getLocation(), 8907 Conv->getLocation())); 8908 8909 if (ASTMutationListener *L = getASTMutationListener()) { 8910 L->CompletedImplicitDefinition(Conv); 8911 L->CompletedImplicitDefinition(Invoke); 8912 } 8913} 8914 8915void Sema::DefineImplicitLambdaToBlockPointerConversion( 8916 SourceLocation CurrentLocation, 8917 CXXConversionDecl *Conv) 8918{ 8919 Conv->setUsed(); 8920 8921 ImplicitlyDefinedFunctionScope Scope(*this, Conv); 8922 DiagnosticErrorTrap Trap(Diags); 8923 8924 // Copy-initialize the lambda object as needed to capture it. 8925 Expr *This = ActOnCXXThis(CurrentLocation).take(); 8926 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 8927 8928 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 8929 Conv->getLocation(), 8930 Conv, DerefThis); 8931 8932 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 8933 // behavior. Note that only the general conversion function does this 8934 // (since it's unusable otherwise); in the case where we inline the 8935 // block literal, it has block literal lifetime semantics. 8936 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 8937 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 8938 CK_CopyAndAutoreleaseBlockObject, 8939 BuildBlock.get(), 0, VK_RValue); 8940 8941 if (BuildBlock.isInvalid()) { 8942 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8943 Conv->setInvalidDecl(); 8944 return; 8945 } 8946 8947 // Create the return statement that returns the block from the conversion 8948 // function. 8949 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 8950 if (Return.isInvalid()) { 8951 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 8952 Conv->setInvalidDecl(); 8953 return; 8954 } 8955 8956 // Set the body of the conversion function. 8957 Stmt *ReturnS = Return.take(); 8958 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 8959 Conv->getLocation(), 8960 Conv->getLocation())); 8961 8962 // We're done; notify the mutation listener, if any. 8963 if (ASTMutationListener *L = getASTMutationListener()) { 8964 L->CompletedImplicitDefinition(Conv); 8965 } 8966} 8967 8968/// \brief Determine whether the given list arguments contains exactly one 8969/// "real" (non-default) argument. 8970static bool hasOneRealArgument(MultiExprArg Args) { 8971 switch (Args.size()) { 8972 case 0: 8973 return false; 8974 8975 default: 8976 if (!Args.get()[1]->isDefaultArgument()) 8977 return false; 8978 8979 // fall through 8980 case 1: 8981 return !Args.get()[0]->isDefaultArgument(); 8982 } 8983 8984 return false; 8985} 8986 8987ExprResult 8988Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 8989 CXXConstructorDecl *Constructor, 8990 MultiExprArg ExprArgs, 8991 bool HadMultipleCandidates, 8992 bool RequiresZeroInit, 8993 unsigned ConstructKind, 8994 SourceRange ParenRange) { 8995 bool Elidable = false; 8996 8997 // C++0x [class.copy]p34: 8998 // When certain criteria are met, an implementation is allowed to 8999 // omit the copy/move construction of a class object, even if the 9000 // copy/move constructor and/or destructor for the object have 9001 // side effects. [...] 9002 // - when a temporary class object that has not been bound to a 9003 // reference (12.2) would be copied/moved to a class object 9004 // with the same cv-unqualified type, the copy/move operation 9005 // can be omitted by constructing the temporary object 9006 // directly into the target of the omitted copy/move 9007 if (ConstructKind == CXXConstructExpr::CK_Complete && 9008 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9009 Expr *SubExpr = ((Expr **)ExprArgs.get())[0]; 9010 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9011 } 9012 9013 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9014 Elidable, move(ExprArgs), HadMultipleCandidates, 9015 RequiresZeroInit, ConstructKind, ParenRange); 9016} 9017 9018/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9019/// including handling of its default argument expressions. 9020ExprResult 9021Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9022 CXXConstructorDecl *Constructor, bool Elidable, 9023 MultiExprArg ExprArgs, 9024 bool HadMultipleCandidates, 9025 bool RequiresZeroInit, 9026 unsigned ConstructKind, 9027 SourceRange ParenRange) { 9028 unsigned NumExprs = ExprArgs.size(); 9029 Expr **Exprs = (Expr **)ExprArgs.release(); 9030 9031 for (specific_attr_iterator<NonNullAttr> 9032 i = Constructor->specific_attr_begin<NonNullAttr>(), 9033 e = Constructor->specific_attr_end<NonNullAttr>(); i != e; ++i) { 9034 const NonNullAttr *NonNull = *i; 9035 CheckNonNullArguments(NonNull, ExprArgs.get(), ConstructLoc); 9036 } 9037 9038 MarkFunctionReferenced(ConstructLoc, Constructor); 9039 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9040 Constructor, Elidable, Exprs, NumExprs, 9041 HadMultipleCandidates, /*FIXME*/false, 9042 RequiresZeroInit, 9043 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9044 ParenRange)); 9045} 9046 9047bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9048 CXXConstructorDecl *Constructor, 9049 MultiExprArg Exprs, 9050 bool HadMultipleCandidates) { 9051 // FIXME: Provide the correct paren SourceRange when available. 9052 ExprResult TempResult = 9053 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9054 move(Exprs), HadMultipleCandidates, false, 9055 CXXConstructExpr::CK_Complete, SourceRange()); 9056 if (TempResult.isInvalid()) 9057 return true; 9058 9059 Expr *Temp = TempResult.takeAs<Expr>(); 9060 CheckImplicitConversions(Temp, VD->getLocation()); 9061 MarkFunctionReferenced(VD->getLocation(), Constructor); 9062 Temp = MaybeCreateExprWithCleanups(Temp); 9063 VD->setInit(Temp); 9064 9065 return false; 9066} 9067 9068void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9069 if (VD->isInvalidDecl()) return; 9070 9071 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9072 if (ClassDecl->isInvalidDecl()) return; 9073 if (ClassDecl->hasIrrelevantDestructor()) return; 9074 if (ClassDecl->isDependentContext()) return; 9075 9076 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9077 MarkFunctionReferenced(VD->getLocation(), Destructor); 9078 CheckDestructorAccess(VD->getLocation(), Destructor, 9079 PDiag(diag::err_access_dtor_var) 9080 << VD->getDeclName() 9081 << VD->getType()); 9082 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9083 9084 if (!VD->hasGlobalStorage()) return; 9085 9086 // Emit warning for non-trivial dtor in global scope (a real global, 9087 // class-static, function-static). 9088 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9089 9090 // TODO: this should be re-enabled for static locals by !CXAAtExit 9091 if (!VD->isStaticLocal()) 9092 Diag(VD->getLocation(), diag::warn_global_destructor); 9093} 9094 9095/// \brief Given a constructor and the set of arguments provided for the 9096/// constructor, convert the arguments and add any required default arguments 9097/// to form a proper call to this constructor. 9098/// 9099/// \returns true if an error occurred, false otherwise. 9100bool 9101Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9102 MultiExprArg ArgsPtr, 9103 SourceLocation Loc, 9104 ASTOwningVector<Expr*> &ConvertedArgs, 9105 bool AllowExplicit) { 9106 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9107 unsigned NumArgs = ArgsPtr.size(); 9108 Expr **Args = (Expr **)ArgsPtr.get(); 9109 9110 const FunctionProtoType *Proto 9111 = Constructor->getType()->getAs<FunctionProtoType>(); 9112 assert(Proto && "Constructor without a prototype?"); 9113 unsigned NumArgsInProto = Proto->getNumArgs(); 9114 9115 // If too few arguments are available, we'll fill in the rest with defaults. 9116 if (NumArgs < NumArgsInProto) 9117 ConvertedArgs.reserve(NumArgsInProto); 9118 else 9119 ConvertedArgs.reserve(NumArgs); 9120 9121 VariadicCallType CallType = 9122 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9123 SmallVector<Expr *, 8> AllArgs; 9124 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9125 Proto, 0, Args, NumArgs, AllArgs, 9126 CallType, AllowExplicit); 9127 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9128 9129 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9130 9131 // FIXME: Missing call to CheckFunctionCall or equivalent 9132 9133 return Invalid; 9134} 9135 9136static inline bool 9137CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9138 const FunctionDecl *FnDecl) { 9139 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9140 if (isa<NamespaceDecl>(DC)) { 9141 return SemaRef.Diag(FnDecl->getLocation(), 9142 diag::err_operator_new_delete_declared_in_namespace) 9143 << FnDecl->getDeclName(); 9144 } 9145 9146 if (isa<TranslationUnitDecl>(DC) && 9147 FnDecl->getStorageClass() == SC_Static) { 9148 return SemaRef.Diag(FnDecl->getLocation(), 9149 diag::err_operator_new_delete_declared_static) 9150 << FnDecl->getDeclName(); 9151 } 9152 9153 return false; 9154} 9155 9156static inline bool 9157CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9158 CanQualType ExpectedResultType, 9159 CanQualType ExpectedFirstParamType, 9160 unsigned DependentParamTypeDiag, 9161 unsigned InvalidParamTypeDiag) { 9162 QualType ResultType = 9163 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9164 9165 // Check that the result type is not dependent. 9166 if (ResultType->isDependentType()) 9167 return SemaRef.Diag(FnDecl->getLocation(), 9168 diag::err_operator_new_delete_dependent_result_type) 9169 << FnDecl->getDeclName() << ExpectedResultType; 9170 9171 // Check that the result type is what we expect. 9172 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9173 return SemaRef.Diag(FnDecl->getLocation(), 9174 diag::err_operator_new_delete_invalid_result_type) 9175 << FnDecl->getDeclName() << ExpectedResultType; 9176 9177 // A function template must have at least 2 parameters. 9178 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9179 return SemaRef.Diag(FnDecl->getLocation(), 9180 diag::err_operator_new_delete_template_too_few_parameters) 9181 << FnDecl->getDeclName(); 9182 9183 // The function decl must have at least 1 parameter. 9184 if (FnDecl->getNumParams() == 0) 9185 return SemaRef.Diag(FnDecl->getLocation(), 9186 diag::err_operator_new_delete_too_few_parameters) 9187 << FnDecl->getDeclName(); 9188 9189 // Check the the first parameter type is not dependent. 9190 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9191 if (FirstParamType->isDependentType()) 9192 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9193 << FnDecl->getDeclName() << ExpectedFirstParamType; 9194 9195 // Check that the first parameter type is what we expect. 9196 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9197 ExpectedFirstParamType) 9198 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9199 << FnDecl->getDeclName() << ExpectedFirstParamType; 9200 9201 return false; 9202} 9203 9204static bool 9205CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9206 // C++ [basic.stc.dynamic.allocation]p1: 9207 // A program is ill-formed if an allocation function is declared in a 9208 // namespace scope other than global scope or declared static in global 9209 // scope. 9210 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9211 return true; 9212 9213 CanQualType SizeTy = 9214 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9215 9216 // C++ [basic.stc.dynamic.allocation]p1: 9217 // The return type shall be void*. The first parameter shall have type 9218 // std::size_t. 9219 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9220 SizeTy, 9221 diag::err_operator_new_dependent_param_type, 9222 diag::err_operator_new_param_type)) 9223 return true; 9224 9225 // C++ [basic.stc.dynamic.allocation]p1: 9226 // The first parameter shall not have an associated default argument. 9227 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9228 return SemaRef.Diag(FnDecl->getLocation(), 9229 diag::err_operator_new_default_arg) 9230 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9231 9232 return false; 9233} 9234 9235static bool 9236CheckOperatorDeleteDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9237 // C++ [basic.stc.dynamic.deallocation]p1: 9238 // A program is ill-formed if deallocation functions are declared in a 9239 // namespace scope other than global scope or declared static in global 9240 // scope. 9241 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9242 return true; 9243 9244 // C++ [basic.stc.dynamic.deallocation]p2: 9245 // Each deallocation function shall return void and its first parameter 9246 // shall be void*. 9247 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9248 SemaRef.Context.VoidPtrTy, 9249 diag::err_operator_delete_dependent_param_type, 9250 diag::err_operator_delete_param_type)) 9251 return true; 9252 9253 return false; 9254} 9255 9256/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9257/// of this overloaded operator is well-formed. If so, returns false; 9258/// otherwise, emits appropriate diagnostics and returns true. 9259bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9260 assert(FnDecl && FnDecl->isOverloadedOperator() && 9261 "Expected an overloaded operator declaration"); 9262 9263 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9264 9265 // C++ [over.oper]p5: 9266 // The allocation and deallocation functions, operator new, 9267 // operator new[], operator delete and operator delete[], are 9268 // described completely in 3.7.3. The attributes and restrictions 9269 // found in the rest of this subclause do not apply to them unless 9270 // explicitly stated in 3.7.3. 9271 if (Op == OO_Delete || Op == OO_Array_Delete) 9272 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9273 9274 if (Op == OO_New || Op == OO_Array_New) 9275 return CheckOperatorNewDeclaration(*this, FnDecl); 9276 9277 // C++ [over.oper]p6: 9278 // An operator function shall either be a non-static member 9279 // function or be a non-member function and have at least one 9280 // parameter whose type is a class, a reference to a class, an 9281 // enumeration, or a reference to an enumeration. 9282 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9283 if (MethodDecl->isStatic()) 9284 return Diag(FnDecl->getLocation(), 9285 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9286 } else { 9287 bool ClassOrEnumParam = false; 9288 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9289 ParamEnd = FnDecl->param_end(); 9290 Param != ParamEnd; ++Param) { 9291 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9292 if (ParamType->isDependentType() || ParamType->isRecordType() || 9293 ParamType->isEnumeralType()) { 9294 ClassOrEnumParam = true; 9295 break; 9296 } 9297 } 9298 9299 if (!ClassOrEnumParam) 9300 return Diag(FnDecl->getLocation(), 9301 diag::err_operator_overload_needs_class_or_enum) 9302 << FnDecl->getDeclName(); 9303 } 9304 9305 // C++ [over.oper]p8: 9306 // An operator function cannot have default arguments (8.3.6), 9307 // except where explicitly stated below. 9308 // 9309 // Only the function-call operator allows default arguments 9310 // (C++ [over.call]p1). 9311 if (Op != OO_Call) { 9312 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9313 Param != FnDecl->param_end(); ++Param) { 9314 if ((*Param)->hasDefaultArg()) 9315 return Diag((*Param)->getLocation(), 9316 diag::err_operator_overload_default_arg) 9317 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9318 } 9319 } 9320 9321 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9322 { false, false, false } 9323#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9324 , { Unary, Binary, MemberOnly } 9325#include "clang/Basic/OperatorKinds.def" 9326 }; 9327 9328 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9329 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9330 bool MustBeMemberOperator = OperatorUses[Op][2]; 9331 9332 // C++ [over.oper]p8: 9333 // [...] Operator functions cannot have more or fewer parameters 9334 // than the number required for the corresponding operator, as 9335 // described in the rest of this subclause. 9336 unsigned NumParams = FnDecl->getNumParams() 9337 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9338 if (Op != OO_Call && 9339 ((NumParams == 1 && !CanBeUnaryOperator) || 9340 (NumParams == 2 && !CanBeBinaryOperator) || 9341 (NumParams < 1) || (NumParams > 2))) { 9342 // We have the wrong number of parameters. 9343 unsigned ErrorKind; 9344 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9345 ErrorKind = 2; // 2 -> unary or binary. 9346 } else if (CanBeUnaryOperator) { 9347 ErrorKind = 0; // 0 -> unary 9348 } else { 9349 assert(CanBeBinaryOperator && 9350 "All non-call overloaded operators are unary or binary!"); 9351 ErrorKind = 1; // 1 -> binary 9352 } 9353 9354 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9355 << FnDecl->getDeclName() << NumParams << ErrorKind; 9356 } 9357 9358 // Overloaded operators other than operator() cannot be variadic. 9359 if (Op != OO_Call && 9360 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9361 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9362 << FnDecl->getDeclName(); 9363 } 9364 9365 // Some operators must be non-static member functions. 9366 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9367 return Diag(FnDecl->getLocation(), 9368 diag::err_operator_overload_must_be_member) 9369 << FnDecl->getDeclName(); 9370 } 9371 9372 // C++ [over.inc]p1: 9373 // The user-defined function called operator++ implements the 9374 // prefix and postfix ++ operator. If this function is a member 9375 // function with no parameters, or a non-member function with one 9376 // parameter of class or enumeration type, it defines the prefix 9377 // increment operator ++ for objects of that type. If the function 9378 // is a member function with one parameter (which shall be of type 9379 // int) or a non-member function with two parameters (the second 9380 // of which shall be of type int), it defines the postfix 9381 // increment operator ++ for objects of that type. 9382 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9383 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9384 bool ParamIsInt = false; 9385 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9386 ParamIsInt = BT->getKind() == BuiltinType::Int; 9387 9388 if (!ParamIsInt) 9389 return Diag(LastParam->getLocation(), 9390 diag::err_operator_overload_post_incdec_must_be_int) 9391 << LastParam->getType() << (Op == OO_MinusMinus); 9392 } 9393 9394 return false; 9395} 9396 9397/// CheckLiteralOperatorDeclaration - Check whether the declaration 9398/// of this literal operator function is well-formed. If so, returns 9399/// false; otherwise, emits appropriate diagnostics and returns true. 9400bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9401 if (isa<CXXMethodDecl>(FnDecl)) { 9402 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9403 << FnDecl->getDeclName(); 9404 return true; 9405 } 9406 9407 if (FnDecl->isExternC()) { 9408 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9409 return true; 9410 } 9411 9412 bool Valid = false; 9413 9414 // This might be the definition of a literal operator template. 9415 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9416 // This might be a specialization of a literal operator template. 9417 if (!TpDecl) 9418 TpDecl = FnDecl->getPrimaryTemplate(); 9419 9420 // template <char...> type operator "" name() is the only valid template 9421 // signature, and the only valid signature with no parameters. 9422 if (TpDecl) { 9423 if (FnDecl->param_size() == 0) { 9424 // Must have only one template parameter 9425 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9426 if (Params->size() == 1) { 9427 NonTypeTemplateParmDecl *PmDecl = 9428 cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9429 9430 // The template parameter must be a char parameter pack. 9431 if (PmDecl && PmDecl->isTemplateParameterPack() && 9432 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9433 Valid = true; 9434 } 9435 } 9436 } else if (FnDecl->param_size()) { 9437 // Check the first parameter 9438 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9439 9440 QualType T = (*Param)->getType().getUnqualifiedType(); 9441 9442 // unsigned long long int, long double, and any character type are allowed 9443 // as the only parameters. 9444 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9445 Context.hasSameType(T, Context.LongDoubleTy) || 9446 Context.hasSameType(T, Context.CharTy) || 9447 Context.hasSameType(T, Context.WCharTy) || 9448 Context.hasSameType(T, Context.Char16Ty) || 9449 Context.hasSameType(T, Context.Char32Ty)) { 9450 if (++Param == FnDecl->param_end()) 9451 Valid = true; 9452 goto FinishedParams; 9453 } 9454 9455 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9456 const PointerType *PT = T->getAs<PointerType>(); 9457 if (!PT) 9458 goto FinishedParams; 9459 T = PT->getPointeeType(); 9460 if (!T.isConstQualified() || T.isVolatileQualified()) 9461 goto FinishedParams; 9462 T = T.getUnqualifiedType(); 9463 9464 // Move on to the second parameter; 9465 ++Param; 9466 9467 // If there is no second parameter, the first must be a const char * 9468 if (Param == FnDecl->param_end()) { 9469 if (Context.hasSameType(T, Context.CharTy)) 9470 Valid = true; 9471 goto FinishedParams; 9472 } 9473 9474 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9475 // are allowed as the first parameter to a two-parameter function 9476 if (!(Context.hasSameType(T, Context.CharTy) || 9477 Context.hasSameType(T, Context.WCharTy) || 9478 Context.hasSameType(T, Context.Char16Ty) || 9479 Context.hasSameType(T, Context.Char32Ty))) 9480 goto FinishedParams; 9481 9482 // The second and final parameter must be an std::size_t 9483 T = (*Param)->getType().getUnqualifiedType(); 9484 if (Context.hasSameType(T, Context.getSizeType()) && 9485 ++Param == FnDecl->param_end()) 9486 Valid = true; 9487 } 9488 9489 // FIXME: This diagnostic is absolutely terrible. 9490FinishedParams: 9491 if (!Valid) { 9492 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9493 << FnDecl->getDeclName(); 9494 return true; 9495 } 9496 9497 // A parameter-declaration-clause containing a default argument is not 9498 // equivalent to any of the permitted forms. 9499 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9500 ParamEnd = FnDecl->param_end(); 9501 Param != ParamEnd; ++Param) { 9502 if ((*Param)->hasDefaultArg()) { 9503 Diag((*Param)->getDefaultArgRange().getBegin(), 9504 diag::err_literal_operator_default_argument) 9505 << (*Param)->getDefaultArgRange(); 9506 break; 9507 } 9508 } 9509 9510 StringRef LiteralName 9511 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9512 if (LiteralName[0] != '_') { 9513 // C++11 [usrlit.suffix]p1: 9514 // Literal suffix identifiers that do not start with an underscore 9515 // are reserved for future standardization. 9516 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9517 } 9518 9519 return false; 9520} 9521 9522/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9523/// linkage specification, including the language and (if present) 9524/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9525/// the location of the language string literal, which is provided 9526/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9527/// the '{' brace. Otherwise, this linkage specification does not 9528/// have any braces. 9529Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9530 SourceLocation LangLoc, 9531 StringRef Lang, 9532 SourceLocation LBraceLoc) { 9533 LinkageSpecDecl::LanguageIDs Language; 9534 if (Lang == "\"C\"") 9535 Language = LinkageSpecDecl::lang_c; 9536 else if (Lang == "\"C++\"") 9537 Language = LinkageSpecDecl::lang_cxx; 9538 else { 9539 Diag(LangLoc, diag::err_bad_language); 9540 return 0; 9541 } 9542 9543 // FIXME: Add all the various semantics of linkage specifications 9544 9545 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9546 ExternLoc, LangLoc, Language); 9547 CurContext->addDecl(D); 9548 PushDeclContext(S, D); 9549 return D; 9550} 9551 9552/// ActOnFinishLinkageSpecification - Complete the definition of 9553/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9554/// valid, it's the position of the closing '}' brace in a linkage 9555/// specification that uses braces. 9556Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9557 Decl *LinkageSpec, 9558 SourceLocation RBraceLoc) { 9559 if (LinkageSpec) { 9560 if (RBraceLoc.isValid()) { 9561 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9562 LSDecl->setRBraceLoc(RBraceLoc); 9563 } 9564 PopDeclContext(); 9565 } 9566 return LinkageSpec; 9567} 9568 9569/// \brief Perform semantic analysis for the variable declaration that 9570/// occurs within a C++ catch clause, returning the newly-created 9571/// variable. 9572VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9573 TypeSourceInfo *TInfo, 9574 SourceLocation StartLoc, 9575 SourceLocation Loc, 9576 IdentifierInfo *Name) { 9577 bool Invalid = false; 9578 QualType ExDeclType = TInfo->getType(); 9579 9580 // Arrays and functions decay. 9581 if (ExDeclType->isArrayType()) 9582 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9583 else if (ExDeclType->isFunctionType()) 9584 ExDeclType = Context.getPointerType(ExDeclType); 9585 9586 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9587 // The exception-declaration shall not denote a pointer or reference to an 9588 // incomplete type, other than [cv] void*. 9589 // N2844 forbids rvalue references. 9590 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9591 Diag(Loc, diag::err_catch_rvalue_ref); 9592 Invalid = true; 9593 } 9594 9595 QualType BaseType = ExDeclType; 9596 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9597 unsigned DK = diag::err_catch_incomplete; 9598 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9599 BaseType = Ptr->getPointeeType(); 9600 Mode = 1; 9601 DK = diag::err_catch_incomplete_ptr; 9602 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9603 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9604 BaseType = Ref->getPointeeType(); 9605 Mode = 2; 9606 DK = diag::err_catch_incomplete_ref; 9607 } 9608 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9609 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9610 Invalid = true; 9611 9612 if (!Invalid && !ExDeclType->isDependentType() && 9613 RequireNonAbstractType(Loc, ExDeclType, 9614 diag::err_abstract_type_in_decl, 9615 AbstractVariableType)) 9616 Invalid = true; 9617 9618 // Only the non-fragile NeXT runtime currently supports C++ catches 9619 // of ObjC types, and no runtime supports catching ObjC types by value. 9620 if (!Invalid && getLangOpts().ObjC1) { 9621 QualType T = ExDeclType; 9622 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9623 T = RT->getPointeeType(); 9624 9625 if (T->isObjCObjectType()) { 9626 Diag(Loc, diag::err_objc_object_catch); 9627 Invalid = true; 9628 } else if (T->isObjCObjectPointerType()) { 9629 // FIXME: should this be a test for macosx-fragile specifically? 9630 if (getLangOpts().ObjCRuntime.isFragile()) 9631 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9632 } 9633 } 9634 9635 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9636 ExDeclType, TInfo, SC_None, SC_None); 9637 ExDecl->setExceptionVariable(true); 9638 9639 // In ARC, infer 'retaining' for variables of retainable type. 9640 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9641 Invalid = true; 9642 9643 if (!Invalid && !ExDeclType->isDependentType()) { 9644 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9645 // C++ [except.handle]p16: 9646 // The object declared in an exception-declaration or, if the 9647 // exception-declaration does not specify a name, a temporary (12.2) is 9648 // copy-initialized (8.5) from the exception object. [...] 9649 // The object is destroyed when the handler exits, after the destruction 9650 // of any automatic objects initialized within the handler. 9651 // 9652 // We just pretend to initialize the object with itself, then make sure 9653 // it can be destroyed later. 9654 QualType initType = ExDeclType; 9655 9656 InitializedEntity entity = 9657 InitializedEntity::InitializeVariable(ExDecl); 9658 InitializationKind initKind = 9659 InitializationKind::CreateCopy(Loc, SourceLocation()); 9660 9661 Expr *opaqueValue = 9662 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9663 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9664 ExprResult result = sequence.Perform(*this, entity, initKind, 9665 MultiExprArg(&opaqueValue, 1)); 9666 if (result.isInvalid()) 9667 Invalid = true; 9668 else { 9669 // If the constructor used was non-trivial, set this as the 9670 // "initializer". 9671 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9672 if (!construct->getConstructor()->isTrivial()) { 9673 Expr *init = MaybeCreateExprWithCleanups(construct); 9674 ExDecl->setInit(init); 9675 } 9676 9677 // And make sure it's destructable. 9678 FinalizeVarWithDestructor(ExDecl, recordType); 9679 } 9680 } 9681 } 9682 9683 if (Invalid) 9684 ExDecl->setInvalidDecl(); 9685 9686 return ExDecl; 9687} 9688 9689/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9690/// handler. 9691Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9692 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9693 bool Invalid = D.isInvalidType(); 9694 9695 // Check for unexpanded parameter packs. 9696 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9697 UPPC_ExceptionType)) { 9698 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9699 D.getIdentifierLoc()); 9700 Invalid = true; 9701 } 9702 9703 IdentifierInfo *II = D.getIdentifier(); 9704 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9705 LookupOrdinaryName, 9706 ForRedeclaration)) { 9707 // The scope should be freshly made just for us. There is just no way 9708 // it contains any previous declaration. 9709 assert(!S->isDeclScope(PrevDecl)); 9710 if (PrevDecl->isTemplateParameter()) { 9711 // Maybe we will complain about the shadowed template parameter. 9712 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9713 PrevDecl = 0; 9714 } 9715 } 9716 9717 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9718 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9719 << D.getCXXScopeSpec().getRange(); 9720 Invalid = true; 9721 } 9722 9723 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9724 D.getLocStart(), 9725 D.getIdentifierLoc(), 9726 D.getIdentifier()); 9727 if (Invalid) 9728 ExDecl->setInvalidDecl(); 9729 9730 // Add the exception declaration into this scope. 9731 if (II) 9732 PushOnScopeChains(ExDecl, S); 9733 else 9734 CurContext->addDecl(ExDecl); 9735 9736 ProcessDeclAttributes(S, ExDecl, D); 9737 return ExDecl; 9738} 9739 9740Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9741 Expr *AssertExpr, 9742 Expr *AssertMessageExpr_, 9743 SourceLocation RParenLoc) { 9744 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr_); 9745 9746 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 9747 // In a static_assert-declaration, the constant-expression shall be a 9748 // constant expression that can be contextually converted to bool. 9749 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9750 if (Converted.isInvalid()) 9751 return 0; 9752 9753 llvm::APSInt Cond; 9754 if (VerifyIntegerConstantExpression(Converted.get(), &Cond, 9755 diag::err_static_assert_expression_is_not_constant, 9756 /*AllowFold=*/false).isInvalid()) 9757 return 0; 9758 9759 if (!Cond) { 9760 llvm::SmallString<256> MsgBuffer; 9761 llvm::raw_svector_ostream Msg(MsgBuffer); 9762 AssertMessage->printPretty(Msg, Context, 0, getPrintingPolicy()); 9763 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9764 << Msg.str() << AssertExpr->getSourceRange(); 9765 } 9766 } 9767 9768 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9769 return 0; 9770 9771 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9772 AssertExpr, AssertMessage, RParenLoc); 9773 9774 CurContext->addDecl(Decl); 9775 return Decl; 9776} 9777 9778/// \brief Perform semantic analysis of the given friend type declaration. 9779/// 9780/// \returns A friend declaration that. 9781FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation Loc, 9782 SourceLocation FriendLoc, 9783 TypeSourceInfo *TSInfo) { 9784 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9785 9786 QualType T = TSInfo->getType(); 9787 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9788 9789 // C++03 [class.friend]p2: 9790 // An elaborated-type-specifier shall be used in a friend declaration 9791 // for a class.* 9792 // 9793 // * The class-key of the elaborated-type-specifier is required. 9794 if (!ActiveTemplateInstantiations.empty()) { 9795 // Do not complain about the form of friend template types during 9796 // template instantiation; we will already have complained when the 9797 // template was declared. 9798 } else if (!T->isElaboratedTypeSpecifier()) { 9799 // If we evaluated the type to a record type, suggest putting 9800 // a tag in front. 9801 if (const RecordType *RT = T->getAs<RecordType>()) { 9802 RecordDecl *RD = RT->getDecl(); 9803 9804 std::string InsertionText = std::string(" ") + RD->getKindName(); 9805 9806 Diag(TypeRange.getBegin(), 9807 getLangOpts().CPlusPlus0x ? 9808 diag::warn_cxx98_compat_unelaborated_friend_type : 9809 diag::ext_unelaborated_friend_type) 9810 << (unsigned) RD->getTagKind() 9811 << T 9812 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9813 InsertionText); 9814 } else { 9815 Diag(FriendLoc, 9816 getLangOpts().CPlusPlus0x ? 9817 diag::warn_cxx98_compat_nonclass_type_friend : 9818 diag::ext_nonclass_type_friend) 9819 << T 9820 << SourceRange(FriendLoc, TypeRange.getEnd()); 9821 } 9822 } else if (T->getAs<EnumType>()) { 9823 Diag(FriendLoc, 9824 getLangOpts().CPlusPlus0x ? 9825 diag::warn_cxx98_compat_enum_friend : 9826 diag::ext_enum_friend) 9827 << T 9828 << SourceRange(FriendLoc, TypeRange.getEnd()); 9829 } 9830 9831 // C++0x [class.friend]p3: 9832 // If the type specifier in a friend declaration designates a (possibly 9833 // cv-qualified) class type, that class is declared as a friend; otherwise, 9834 // the friend declaration is ignored. 9835 9836 // FIXME: C++0x has some syntactic restrictions on friend type declarations 9837 // in [class.friend]p3 that we do not implement. 9838 9839 return FriendDecl::Create(Context, CurContext, Loc, TSInfo, FriendLoc); 9840} 9841 9842/// Handle a friend tag declaration where the scope specifier was 9843/// templated. 9844Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9845 unsigned TagSpec, SourceLocation TagLoc, 9846 CXXScopeSpec &SS, 9847 IdentifierInfo *Name, SourceLocation NameLoc, 9848 AttributeList *Attr, 9849 MultiTemplateParamsArg TempParamLists) { 9850 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9851 9852 bool isExplicitSpecialization = false; 9853 bool Invalid = false; 9854 9855 if (TemplateParameterList *TemplateParams 9856 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9857 TempParamLists.get(), 9858 TempParamLists.size(), 9859 /*friend*/ true, 9860 isExplicitSpecialization, 9861 Invalid)) { 9862 if (TemplateParams->size() > 0) { 9863 // This is a declaration of a class template. 9864 if (Invalid) 9865 return 0; 9866 9867 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9868 SS, Name, NameLoc, Attr, 9869 TemplateParams, AS_public, 9870 /*ModulePrivateLoc=*/SourceLocation(), 9871 TempParamLists.size() - 1, 9872 (TemplateParameterList**) TempParamLists.release()).take(); 9873 } else { 9874 // The "template<>" header is extraneous. 9875 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 9876 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 9877 isExplicitSpecialization = true; 9878 } 9879 } 9880 9881 if (Invalid) return 0; 9882 9883 bool isAllExplicitSpecializations = true; 9884 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 9885 if (TempParamLists.get()[I]->size()) { 9886 isAllExplicitSpecializations = false; 9887 break; 9888 } 9889 } 9890 9891 // FIXME: don't ignore attributes. 9892 9893 // If it's explicit specializations all the way down, just forget 9894 // about the template header and build an appropriate non-templated 9895 // friend. TODO: for source fidelity, remember the headers. 9896 if (isAllExplicitSpecializations) { 9897 if (SS.isEmpty()) { 9898 bool Owned = false; 9899 bool IsDependent = false; 9900 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 9901 Attr, AS_public, 9902 /*ModulePrivateLoc=*/SourceLocation(), 9903 MultiTemplateParamsArg(), Owned, IsDependent, 9904 /*ScopedEnumKWLoc=*/SourceLocation(), 9905 /*ScopedEnumUsesClassTag=*/false, 9906 /*UnderlyingType=*/TypeResult()); 9907 } 9908 9909 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 9910 ElaboratedTypeKeyword Keyword 9911 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9912 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 9913 *Name, NameLoc); 9914 if (T.isNull()) 9915 return 0; 9916 9917 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9918 if (isa<DependentNameType>(T)) { 9919 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9920 TL.setElaboratedKeywordLoc(TagLoc); 9921 TL.setQualifierLoc(QualifierLoc); 9922 TL.setNameLoc(NameLoc); 9923 } else { 9924 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 9925 TL.setElaboratedKeywordLoc(TagLoc); 9926 TL.setQualifierLoc(QualifierLoc); 9927 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 9928 } 9929 9930 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9931 TSI, FriendLoc); 9932 Friend->setAccess(AS_public); 9933 CurContext->addDecl(Friend); 9934 return Friend; 9935 } 9936 9937 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 9938 9939 9940 9941 // Handle the case of a templated-scope friend class. e.g. 9942 // template <class T> class A<T>::B; 9943 // FIXME: we don't support these right now. 9944 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 9945 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 9946 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 9947 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 9948 TL.setElaboratedKeywordLoc(TagLoc); 9949 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 9950 TL.setNameLoc(NameLoc); 9951 9952 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 9953 TSI, FriendLoc); 9954 Friend->setAccess(AS_public); 9955 Friend->setUnsupportedFriend(true); 9956 CurContext->addDecl(Friend); 9957 return Friend; 9958} 9959 9960 9961/// Handle a friend type declaration. This works in tandem with 9962/// ActOnTag. 9963/// 9964/// Notes on friend class templates: 9965/// 9966/// We generally treat friend class declarations as if they were 9967/// declaring a class. So, for example, the elaborated type specifier 9968/// in a friend declaration is required to obey the restrictions of a 9969/// class-head (i.e. no typedefs in the scope chain), template 9970/// parameters are required to match up with simple template-ids, &c. 9971/// However, unlike when declaring a template specialization, it's 9972/// okay to refer to a template specialization without an empty 9973/// template parameter declaration, e.g. 9974/// friend class A<T>::B<unsigned>; 9975/// We permit this as a special case; if there are any template 9976/// parameters present at all, require proper matching, i.e. 9977/// template <> template \<class T> friend class A<int>::B; 9978Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 9979 MultiTemplateParamsArg TempParams) { 9980 SourceLocation Loc = DS.getLocStart(); 9981 9982 assert(DS.isFriendSpecified()); 9983 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 9984 9985 // Try to convert the decl specifier to a type. This works for 9986 // friend templates because ActOnTag never produces a ClassTemplateDecl 9987 // for a TUK_Friend. 9988 Declarator TheDeclarator(DS, Declarator::MemberContext); 9989 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 9990 QualType T = TSI->getType(); 9991 if (TheDeclarator.isInvalidType()) 9992 return 0; 9993 9994 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 9995 return 0; 9996 9997 // This is definitely an error in C++98. It's probably meant to 9998 // be forbidden in C++0x, too, but the specification is just 9999 // poorly written. 10000 // 10001 // The problem is with declarations like the following: 10002 // template <T> friend A<T>::foo; 10003 // where deciding whether a class C is a friend or not now hinges 10004 // on whether there exists an instantiation of A that causes 10005 // 'foo' to equal C. There are restrictions on class-heads 10006 // (which we declare (by fiat) elaborated friend declarations to 10007 // be) that makes this tractable. 10008 // 10009 // FIXME: handle "template <> friend class A<T>;", which 10010 // is possibly well-formed? Who even knows? 10011 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10012 Diag(Loc, diag::err_tagless_friend_type_template) 10013 << DS.getSourceRange(); 10014 return 0; 10015 } 10016 10017 // C++98 [class.friend]p1: A friend of a class is a function 10018 // or class that is not a member of the class . . . 10019 // This is fixed in DR77, which just barely didn't make the C++03 10020 // deadline. It's also a very silly restriction that seriously 10021 // affects inner classes and which nobody else seems to implement; 10022 // thus we never diagnose it, not even in -pedantic. 10023 // 10024 // But note that we could warn about it: it's always useless to 10025 // friend one of your own members (it's not, however, worthless to 10026 // friend a member of an arbitrary specialization of your template). 10027 10028 Decl *D; 10029 if (unsigned NumTempParamLists = TempParams.size()) 10030 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10031 NumTempParamLists, 10032 TempParams.release(), 10033 TSI, 10034 DS.getFriendSpecLoc()); 10035 else 10036 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10037 10038 if (!D) 10039 return 0; 10040 10041 D->setAccess(AS_public); 10042 CurContext->addDecl(D); 10043 10044 return D; 10045} 10046 10047Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10048 MultiTemplateParamsArg TemplateParams) { 10049 const DeclSpec &DS = D.getDeclSpec(); 10050 10051 assert(DS.isFriendSpecified()); 10052 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10053 10054 SourceLocation Loc = D.getIdentifierLoc(); 10055 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10056 10057 // C++ [class.friend]p1 10058 // A friend of a class is a function or class.... 10059 // Note that this sees through typedefs, which is intended. 10060 // It *doesn't* see through dependent types, which is correct 10061 // according to [temp.arg.type]p3: 10062 // If a declaration acquires a function type through a 10063 // type dependent on a template-parameter and this causes 10064 // a declaration that does not use the syntactic form of a 10065 // function declarator to have a function type, the program 10066 // is ill-formed. 10067 if (!TInfo->getType()->isFunctionType()) { 10068 Diag(Loc, diag::err_unexpected_friend); 10069 10070 // It might be worthwhile to try to recover by creating an 10071 // appropriate declaration. 10072 return 0; 10073 } 10074 10075 // C++ [namespace.memdef]p3 10076 // - If a friend declaration in a non-local class first declares a 10077 // class or function, the friend class or function is a member 10078 // of the innermost enclosing namespace. 10079 // - The name of the friend is not found by simple name lookup 10080 // until a matching declaration is provided in that namespace 10081 // scope (either before or after the class declaration granting 10082 // friendship). 10083 // - If a friend function is called, its name may be found by the 10084 // name lookup that considers functions from namespaces and 10085 // classes associated with the types of the function arguments. 10086 // - When looking for a prior declaration of a class or a function 10087 // declared as a friend, scopes outside the innermost enclosing 10088 // namespace scope are not considered. 10089 10090 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10091 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10092 DeclarationName Name = NameInfo.getName(); 10093 assert(Name); 10094 10095 // Check for unexpanded parameter packs. 10096 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10097 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10098 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10099 return 0; 10100 10101 // The context we found the declaration in, or in which we should 10102 // create the declaration. 10103 DeclContext *DC; 10104 Scope *DCScope = S; 10105 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10106 ForRedeclaration); 10107 10108 // FIXME: there are different rules in local classes 10109 10110 // There are four cases here. 10111 // - There's no scope specifier, in which case we just go to the 10112 // appropriate scope and look for a function or function template 10113 // there as appropriate. 10114 // Recover from invalid scope qualifiers as if they just weren't there. 10115 if (SS.isInvalid() || !SS.isSet()) { 10116 // C++0x [namespace.memdef]p3: 10117 // If the name in a friend declaration is neither qualified nor 10118 // a template-id and the declaration is a function or an 10119 // elaborated-type-specifier, the lookup to determine whether 10120 // the entity has been previously declared shall not consider 10121 // any scopes outside the innermost enclosing namespace. 10122 // C++0x [class.friend]p11: 10123 // If a friend declaration appears in a local class and the name 10124 // specified is an unqualified name, a prior declaration is 10125 // looked up without considering scopes that are outside the 10126 // innermost enclosing non-class scope. For a friend function 10127 // declaration, if there is no prior declaration, the program is 10128 // ill-formed. 10129 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10130 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10131 10132 // Find the appropriate context according to the above. 10133 DC = CurContext; 10134 while (true) { 10135 // Skip class contexts. If someone can cite chapter and verse 10136 // for this behavior, that would be nice --- it's what GCC and 10137 // EDG do, and it seems like a reasonable intent, but the spec 10138 // really only says that checks for unqualified existing 10139 // declarations should stop at the nearest enclosing namespace, 10140 // not that they should only consider the nearest enclosing 10141 // namespace. 10142 while (DC->isRecord() || DC->isTransparentContext()) 10143 DC = DC->getParent(); 10144 10145 LookupQualifiedName(Previous, DC); 10146 10147 // TODO: decide what we think about using declarations. 10148 if (isLocal || !Previous.empty()) 10149 break; 10150 10151 if (isTemplateId) { 10152 if (isa<TranslationUnitDecl>(DC)) break; 10153 } else { 10154 if (DC->isFileContext()) break; 10155 } 10156 DC = DC->getParent(); 10157 } 10158 10159 // C++ [class.friend]p1: A friend of a class is a function or 10160 // class that is not a member of the class . . . 10161 // C++11 changes this for both friend types and functions. 10162 // Most C++ 98 compilers do seem to give an error here, so 10163 // we do, too. 10164 if (!Previous.empty() && DC->Equals(CurContext)) 10165 Diag(DS.getFriendSpecLoc(), 10166 getLangOpts().CPlusPlus0x ? 10167 diag::warn_cxx98_compat_friend_is_member : 10168 diag::err_friend_is_member); 10169 10170 DCScope = getScopeForDeclContext(S, DC); 10171 10172 // C++ [class.friend]p6: 10173 // A function can be defined in a friend declaration of a class if and 10174 // only if the class is a non-local class (9.8), the function name is 10175 // unqualified, and the function has namespace scope. 10176 if (isLocal && D.isFunctionDefinition()) { 10177 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10178 } 10179 10180 // - There's a non-dependent scope specifier, in which case we 10181 // compute it and do a previous lookup there for a function 10182 // or function template. 10183 } else if (!SS.getScopeRep()->isDependent()) { 10184 DC = computeDeclContext(SS); 10185 if (!DC) return 0; 10186 10187 if (RequireCompleteDeclContext(SS, DC)) return 0; 10188 10189 LookupQualifiedName(Previous, DC); 10190 10191 // Ignore things found implicitly in the wrong scope. 10192 // TODO: better diagnostics for this case. Suggesting the right 10193 // qualified scope would be nice... 10194 LookupResult::Filter F = Previous.makeFilter(); 10195 while (F.hasNext()) { 10196 NamedDecl *D = F.next(); 10197 if (!DC->InEnclosingNamespaceSetOf( 10198 D->getDeclContext()->getRedeclContext())) 10199 F.erase(); 10200 } 10201 F.done(); 10202 10203 if (Previous.empty()) { 10204 D.setInvalidType(); 10205 Diag(Loc, diag::err_qualified_friend_not_found) 10206 << Name << TInfo->getType(); 10207 return 0; 10208 } 10209 10210 // C++ [class.friend]p1: A friend of a class is a function or 10211 // class that is not a member of the class . . . 10212 if (DC->Equals(CurContext)) 10213 Diag(DS.getFriendSpecLoc(), 10214 getLangOpts().CPlusPlus0x ? 10215 diag::warn_cxx98_compat_friend_is_member : 10216 diag::err_friend_is_member); 10217 10218 if (D.isFunctionDefinition()) { 10219 // C++ [class.friend]p6: 10220 // A function can be defined in a friend declaration of a class if and 10221 // only if the class is a non-local class (9.8), the function name is 10222 // unqualified, and the function has namespace scope. 10223 SemaDiagnosticBuilder DB 10224 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10225 10226 DB << SS.getScopeRep(); 10227 if (DC->isFileContext()) 10228 DB << FixItHint::CreateRemoval(SS.getRange()); 10229 SS.clear(); 10230 } 10231 10232 // - There's a scope specifier that does not match any template 10233 // parameter lists, in which case we use some arbitrary context, 10234 // create a method or method template, and wait for instantiation. 10235 // - There's a scope specifier that does match some template 10236 // parameter lists, which we don't handle right now. 10237 } else { 10238 if (D.isFunctionDefinition()) { 10239 // C++ [class.friend]p6: 10240 // A function can be defined in a friend declaration of a class if and 10241 // only if the class is a non-local class (9.8), the function name is 10242 // unqualified, and the function has namespace scope. 10243 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10244 << SS.getScopeRep(); 10245 } 10246 10247 DC = CurContext; 10248 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10249 } 10250 10251 if (!DC->isRecord()) { 10252 // This implies that it has to be an operator or function. 10253 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10254 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10255 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10256 Diag(Loc, diag::err_introducing_special_friend) << 10257 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10258 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10259 return 0; 10260 } 10261 } 10262 10263 // FIXME: This is an egregious hack to cope with cases where the scope stack 10264 // does not contain the declaration context, i.e., in an out-of-line 10265 // definition of a class. 10266 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10267 if (!DCScope) { 10268 FakeDCScope.setEntity(DC); 10269 DCScope = &FakeDCScope; 10270 } 10271 10272 bool AddToScope = true; 10273 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10274 move(TemplateParams), AddToScope); 10275 if (!ND) return 0; 10276 10277 assert(ND->getDeclContext() == DC); 10278 assert(ND->getLexicalDeclContext() == CurContext); 10279 10280 // Add the function declaration to the appropriate lookup tables, 10281 // adjusting the redeclarations list as necessary. We don't 10282 // want to do this yet if the friending class is dependent. 10283 // 10284 // Also update the scope-based lookup if the target context's 10285 // lookup context is in lexical scope. 10286 if (!CurContext->isDependentContext()) { 10287 DC = DC->getRedeclContext(); 10288 DC->makeDeclVisibleInContext(ND); 10289 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10290 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10291 } 10292 10293 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10294 D.getIdentifierLoc(), ND, 10295 DS.getFriendSpecLoc()); 10296 FrD->setAccess(AS_public); 10297 CurContext->addDecl(FrD); 10298 10299 if (ND->isInvalidDecl()) 10300 FrD->setInvalidDecl(); 10301 else { 10302 FunctionDecl *FD; 10303 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10304 FD = FTD->getTemplatedDecl(); 10305 else 10306 FD = cast<FunctionDecl>(ND); 10307 10308 // Mark templated-scope function declarations as unsupported. 10309 if (FD->getNumTemplateParameterLists()) 10310 FrD->setUnsupportedFriend(true); 10311 } 10312 10313 return ND; 10314} 10315 10316void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10317 AdjustDeclIfTemplate(Dcl); 10318 10319 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10320 if (!Fn) { 10321 Diag(DelLoc, diag::err_deleted_non_function); 10322 return; 10323 } 10324 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10325 Diag(DelLoc, diag::err_deleted_decl_not_first); 10326 Diag(Prev->getLocation(), diag::note_previous_declaration); 10327 // If the declaration wasn't the first, we delete the function anyway for 10328 // recovery. 10329 } 10330 Fn->setDeletedAsWritten(); 10331 10332 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10333 if (!MD) 10334 return; 10335 10336 // A deleted special member function is trivial if the corresponding 10337 // implicitly-declared function would have been. 10338 switch (getSpecialMember(MD)) { 10339 case CXXInvalid: 10340 break; 10341 case CXXDefaultConstructor: 10342 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10343 break; 10344 case CXXCopyConstructor: 10345 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10346 break; 10347 case CXXMoveConstructor: 10348 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10349 break; 10350 case CXXCopyAssignment: 10351 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10352 break; 10353 case CXXMoveAssignment: 10354 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10355 break; 10356 case CXXDestructor: 10357 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10358 break; 10359 } 10360} 10361 10362void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10363 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10364 10365 if (MD) { 10366 if (MD->getParent()->isDependentType()) { 10367 MD->setDefaulted(); 10368 MD->setExplicitlyDefaulted(); 10369 return; 10370 } 10371 10372 CXXSpecialMember Member = getSpecialMember(MD); 10373 if (Member == CXXInvalid) { 10374 Diag(DefaultLoc, diag::err_default_special_members); 10375 return; 10376 } 10377 10378 MD->setDefaulted(); 10379 MD->setExplicitlyDefaulted(); 10380 10381 // If this definition appears within the record, do the checking when 10382 // the record is complete. 10383 const FunctionDecl *Primary = MD; 10384 if (MD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 10385 // Find the uninstantiated declaration that actually had the '= default' 10386 // on it. 10387 MD->getTemplateInstantiationPattern()->isDefined(Primary); 10388 10389 if (Primary == Primary->getCanonicalDecl()) 10390 return; 10391 10392 switch (Member) { 10393 case CXXDefaultConstructor: { 10394 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10395 CheckExplicitlyDefaultedSpecialMember(CD); 10396 if (!CD->isInvalidDecl()) 10397 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10398 break; 10399 } 10400 10401 case CXXCopyConstructor: { 10402 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10403 CheckExplicitlyDefaultedSpecialMember(CD); 10404 if (!CD->isInvalidDecl()) 10405 DefineImplicitCopyConstructor(DefaultLoc, CD); 10406 break; 10407 } 10408 10409 case CXXCopyAssignment: { 10410 CheckExplicitlyDefaultedSpecialMember(MD); 10411 if (!MD->isInvalidDecl()) 10412 DefineImplicitCopyAssignment(DefaultLoc, MD); 10413 break; 10414 } 10415 10416 case CXXDestructor: { 10417 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10418 CheckExplicitlyDefaultedSpecialMember(DD); 10419 if (!DD->isInvalidDecl()) 10420 DefineImplicitDestructor(DefaultLoc, DD); 10421 break; 10422 } 10423 10424 case CXXMoveConstructor: { 10425 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10426 CheckExplicitlyDefaultedSpecialMember(CD); 10427 if (!CD->isInvalidDecl()) 10428 DefineImplicitMoveConstructor(DefaultLoc, CD); 10429 break; 10430 } 10431 10432 case CXXMoveAssignment: { 10433 CheckExplicitlyDefaultedSpecialMember(MD); 10434 if (!MD->isInvalidDecl()) 10435 DefineImplicitMoveAssignment(DefaultLoc, MD); 10436 break; 10437 } 10438 10439 case CXXInvalid: 10440 llvm_unreachable("Invalid special member."); 10441 } 10442 } else { 10443 Diag(DefaultLoc, diag::err_default_special_members); 10444 } 10445} 10446 10447static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10448 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10449 Stmt *SubStmt = *CI; 10450 if (!SubStmt) 10451 continue; 10452 if (isa<ReturnStmt>(SubStmt)) 10453 Self.Diag(SubStmt->getLocStart(), 10454 diag::err_return_in_constructor_handler); 10455 if (!isa<Expr>(SubStmt)) 10456 SearchForReturnInStmt(Self, SubStmt); 10457 } 10458} 10459 10460void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10461 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10462 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10463 SearchForReturnInStmt(*this, Handler); 10464 } 10465} 10466 10467bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10468 const CXXMethodDecl *Old) { 10469 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10470 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10471 10472 if (Context.hasSameType(NewTy, OldTy) || 10473 NewTy->isDependentType() || OldTy->isDependentType()) 10474 return false; 10475 10476 // Check if the return types are covariant 10477 QualType NewClassTy, OldClassTy; 10478 10479 /// Both types must be pointers or references to classes. 10480 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10481 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10482 NewClassTy = NewPT->getPointeeType(); 10483 OldClassTy = OldPT->getPointeeType(); 10484 } 10485 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10486 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10487 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10488 NewClassTy = NewRT->getPointeeType(); 10489 OldClassTy = OldRT->getPointeeType(); 10490 } 10491 } 10492 } 10493 10494 // The return types aren't either both pointers or references to a class type. 10495 if (NewClassTy.isNull()) { 10496 Diag(New->getLocation(), 10497 diag::err_different_return_type_for_overriding_virtual_function) 10498 << New->getDeclName() << NewTy << OldTy; 10499 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10500 10501 return true; 10502 } 10503 10504 // C++ [class.virtual]p6: 10505 // If the return type of D::f differs from the return type of B::f, the 10506 // class type in the return type of D::f shall be complete at the point of 10507 // declaration of D::f or shall be the class type D. 10508 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10509 if (!RT->isBeingDefined() && 10510 RequireCompleteType(New->getLocation(), NewClassTy, 10511 diag::err_covariant_return_incomplete, 10512 New->getDeclName())) 10513 return true; 10514 } 10515 10516 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10517 // Check if the new class derives from the old class. 10518 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10519 Diag(New->getLocation(), 10520 diag::err_covariant_return_not_derived) 10521 << New->getDeclName() << NewTy << OldTy; 10522 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10523 return true; 10524 } 10525 10526 // Check if we the conversion from derived to base is valid. 10527 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10528 diag::err_covariant_return_inaccessible_base, 10529 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10530 // FIXME: Should this point to the return type? 10531 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10532 // FIXME: this note won't trigger for delayed access control 10533 // diagnostics, and it's impossible to get an undelayed error 10534 // here from access control during the original parse because 10535 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10536 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10537 return true; 10538 } 10539 } 10540 10541 // The qualifiers of the return types must be the same. 10542 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10543 Diag(New->getLocation(), 10544 diag::err_covariant_return_type_different_qualifications) 10545 << New->getDeclName() << NewTy << OldTy; 10546 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10547 return true; 10548 }; 10549 10550 10551 // The new class type must have the same or less qualifiers as the old type. 10552 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10553 Diag(New->getLocation(), 10554 diag::err_covariant_return_type_class_type_more_qualified) 10555 << New->getDeclName() << NewTy << OldTy; 10556 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10557 return true; 10558 }; 10559 10560 return false; 10561} 10562 10563/// \brief Mark the given method pure. 10564/// 10565/// \param Method the method to be marked pure. 10566/// 10567/// \param InitRange the source range that covers the "0" initializer. 10568bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10569 SourceLocation EndLoc = InitRange.getEnd(); 10570 if (EndLoc.isValid()) 10571 Method->setRangeEnd(EndLoc); 10572 10573 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10574 Method->setPure(); 10575 return false; 10576 } 10577 10578 if (!Method->isInvalidDecl()) 10579 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10580 << Method->getDeclName() << InitRange; 10581 return true; 10582} 10583 10584/// \brief Determine whether the given declaration is a static data member. 10585static bool isStaticDataMember(Decl *D) { 10586 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10587 if (!Var) 10588 return false; 10589 10590 return Var->isStaticDataMember(); 10591} 10592/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10593/// an initializer for the out-of-line declaration 'Dcl'. The scope 10594/// is a fresh scope pushed for just this purpose. 10595/// 10596/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10597/// static data member of class X, names should be looked up in the scope of 10598/// class X. 10599void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10600 // If there is no declaration, there was an error parsing it. 10601 if (D == 0 || D->isInvalidDecl()) return; 10602 10603 // We should only get called for declarations with scope specifiers, like: 10604 // int foo::bar; 10605 assert(D->isOutOfLine()); 10606 EnterDeclaratorContext(S, D->getDeclContext()); 10607 10608 // If we are parsing the initializer for a static data member, push a 10609 // new expression evaluation context that is associated with this static 10610 // data member. 10611 if (isStaticDataMember(D)) 10612 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10613} 10614 10615/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10616/// initializer for the out-of-line declaration 'D'. 10617void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10618 // If there is no declaration, there was an error parsing it. 10619 if (D == 0 || D->isInvalidDecl()) return; 10620 10621 if (isStaticDataMember(D)) 10622 PopExpressionEvaluationContext(); 10623 10624 assert(D->isOutOfLine()); 10625 ExitDeclaratorContext(S); 10626} 10627 10628/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10629/// C++ if/switch/while/for statement. 10630/// e.g: "if (int x = f()) {...}" 10631DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10632 // C++ 6.4p2: 10633 // The declarator shall not specify a function or an array. 10634 // The type-specifier-seq shall not contain typedef and shall not declare a 10635 // new class or enumeration. 10636 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10637 "Parser allowed 'typedef' as storage class of condition decl."); 10638 10639 Decl *Dcl = ActOnDeclarator(S, D); 10640 if (!Dcl) 10641 return true; 10642 10643 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10644 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10645 << D.getSourceRange(); 10646 return true; 10647 } 10648 10649 return Dcl; 10650} 10651 10652void Sema::LoadExternalVTableUses() { 10653 if (!ExternalSource) 10654 return; 10655 10656 SmallVector<ExternalVTableUse, 4> VTables; 10657 ExternalSource->ReadUsedVTables(VTables); 10658 SmallVector<VTableUse, 4> NewUses; 10659 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10660 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10661 = VTablesUsed.find(VTables[I].Record); 10662 // Even if a definition wasn't required before, it may be required now. 10663 if (Pos != VTablesUsed.end()) { 10664 if (!Pos->second && VTables[I].DefinitionRequired) 10665 Pos->second = true; 10666 continue; 10667 } 10668 10669 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10670 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10671 } 10672 10673 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10674} 10675 10676void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10677 bool DefinitionRequired) { 10678 // Ignore any vtable uses in unevaluated operands or for classes that do 10679 // not have a vtable. 10680 if (!Class->isDynamicClass() || Class->isDependentContext() || 10681 CurContext->isDependentContext() || 10682 ExprEvalContexts.back().Context == Unevaluated) 10683 return; 10684 10685 // Try to insert this class into the map. 10686 LoadExternalVTableUses(); 10687 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10688 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10689 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10690 if (!Pos.second) { 10691 // If we already had an entry, check to see if we are promoting this vtable 10692 // to required a definition. If so, we need to reappend to the VTableUses 10693 // list, since we may have already processed the first entry. 10694 if (DefinitionRequired && !Pos.first->second) { 10695 Pos.first->second = true; 10696 } else { 10697 // Otherwise, we can early exit. 10698 return; 10699 } 10700 } 10701 10702 // Local classes need to have their virtual members marked 10703 // immediately. For all other classes, we mark their virtual members 10704 // at the end of the translation unit. 10705 if (Class->isLocalClass()) 10706 MarkVirtualMembersReferenced(Loc, Class); 10707 else 10708 VTableUses.push_back(std::make_pair(Class, Loc)); 10709} 10710 10711bool Sema::DefineUsedVTables() { 10712 LoadExternalVTableUses(); 10713 if (VTableUses.empty()) 10714 return false; 10715 10716 // Note: The VTableUses vector could grow as a result of marking 10717 // the members of a class as "used", so we check the size each 10718 // time through the loop and prefer indices (with are stable) to 10719 // iterators (which are not). 10720 bool DefinedAnything = false; 10721 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10722 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10723 if (!Class) 10724 continue; 10725 10726 SourceLocation Loc = VTableUses[I].second; 10727 10728 // If this class has a key function, but that key function is 10729 // defined in another translation unit, we don't need to emit the 10730 // vtable even though we're using it. 10731 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10732 if (KeyFunction && !KeyFunction->hasBody()) { 10733 switch (KeyFunction->getTemplateSpecializationKind()) { 10734 case TSK_Undeclared: 10735 case TSK_ExplicitSpecialization: 10736 case TSK_ExplicitInstantiationDeclaration: 10737 // The key function is in another translation unit. 10738 continue; 10739 10740 case TSK_ExplicitInstantiationDefinition: 10741 case TSK_ImplicitInstantiation: 10742 // We will be instantiating the key function. 10743 break; 10744 } 10745 } else if (!KeyFunction) { 10746 // If we have a class with no key function that is the subject 10747 // of an explicit instantiation declaration, suppress the 10748 // vtable; it will live with the explicit instantiation 10749 // definition. 10750 bool IsExplicitInstantiationDeclaration 10751 = Class->getTemplateSpecializationKind() 10752 == TSK_ExplicitInstantiationDeclaration; 10753 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10754 REnd = Class->redecls_end(); 10755 R != REnd; ++R) { 10756 TemplateSpecializationKind TSK 10757 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10758 if (TSK == TSK_ExplicitInstantiationDeclaration) 10759 IsExplicitInstantiationDeclaration = true; 10760 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10761 IsExplicitInstantiationDeclaration = false; 10762 break; 10763 } 10764 } 10765 10766 if (IsExplicitInstantiationDeclaration) 10767 continue; 10768 } 10769 10770 // Mark all of the virtual members of this class as referenced, so 10771 // that we can build a vtable. Then, tell the AST consumer that a 10772 // vtable for this class is required. 10773 DefinedAnything = true; 10774 MarkVirtualMembersReferenced(Loc, Class); 10775 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10776 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10777 10778 // Optionally warn if we're emitting a weak vtable. 10779 if (Class->getLinkage() == ExternalLinkage && 10780 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10781 const FunctionDecl *KeyFunctionDef = 0; 10782 if (!KeyFunction || 10783 (KeyFunction->hasBody(KeyFunctionDef) && 10784 KeyFunctionDef->isInlined())) 10785 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10786 TSK_ExplicitInstantiationDefinition 10787 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10788 << Class; 10789 } 10790 } 10791 VTableUses.clear(); 10792 10793 return DefinedAnything; 10794} 10795 10796void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10797 const CXXRecordDecl *RD) { 10798 for (CXXRecordDecl::method_iterator i = RD->method_begin(), 10799 e = RD->method_end(); i != e; ++i) { 10800 CXXMethodDecl *MD = *i; 10801 10802 // C++ [basic.def.odr]p2: 10803 // [...] A virtual member function is used if it is not pure. [...] 10804 if (MD->isVirtual() && !MD->isPure()) 10805 MarkFunctionReferenced(Loc, MD); 10806 } 10807 10808 // Only classes that have virtual bases need a VTT. 10809 if (RD->getNumVBases() == 0) 10810 return; 10811 10812 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10813 e = RD->bases_end(); i != e; ++i) { 10814 const CXXRecordDecl *Base = 10815 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10816 if (Base->getNumVBases() == 0) 10817 continue; 10818 MarkVirtualMembersReferenced(Loc, Base); 10819 } 10820} 10821 10822/// SetIvarInitializers - This routine builds initialization ASTs for the 10823/// Objective-C implementation whose ivars need be initialized. 10824void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10825 if (!getLangOpts().CPlusPlus) 10826 return; 10827 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10828 SmallVector<ObjCIvarDecl*, 8> ivars; 10829 CollectIvarsToConstructOrDestruct(OID, ivars); 10830 if (ivars.empty()) 10831 return; 10832 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10833 for (unsigned i = 0; i < ivars.size(); i++) { 10834 FieldDecl *Field = ivars[i]; 10835 if (Field->isInvalidDecl()) 10836 continue; 10837 10838 CXXCtorInitializer *Member; 10839 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10840 InitializationKind InitKind = 10841 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 10842 10843 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 10844 ExprResult MemberInit = 10845 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 10846 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 10847 // Note, MemberInit could actually come back empty if no initialization 10848 // is required (e.g., because it would call a trivial default constructor) 10849 if (!MemberInit.get() || MemberInit.isInvalid()) 10850 continue; 10851 10852 Member = 10853 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 10854 SourceLocation(), 10855 MemberInit.takeAs<Expr>(), 10856 SourceLocation()); 10857 AllToInit.push_back(Member); 10858 10859 // Be sure that the destructor is accessible and is marked as referenced. 10860 if (const RecordType *RecordTy 10861 = Context.getBaseElementType(Field->getType()) 10862 ->getAs<RecordType>()) { 10863 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 10864 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 10865 MarkFunctionReferenced(Field->getLocation(), Destructor); 10866 CheckDestructorAccess(Field->getLocation(), Destructor, 10867 PDiag(diag::err_access_dtor_ivar) 10868 << Context.getBaseElementType(Field->getType())); 10869 } 10870 } 10871 } 10872 ObjCImplementation->setIvarInitializers(Context, 10873 AllToInit.data(), AllToInit.size()); 10874 } 10875} 10876 10877static 10878void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 10879 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 10880 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 10881 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 10882 Sema &S) { 10883 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10884 CE = Current.end(); 10885 if (Ctor->isInvalidDecl()) 10886 return; 10887 10888 const FunctionDecl *FNTarget = 0; 10889 CXXConstructorDecl *Target; 10890 10891 // We ignore the result here since if we don't have a body, Target will be 10892 // null below. 10893 (void)Ctor->getTargetConstructor()->hasBody(FNTarget); 10894 Target 10895= const_cast<CXXConstructorDecl*>(cast_or_null<CXXConstructorDecl>(FNTarget)); 10896 10897 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 10898 // Avoid dereferencing a null pointer here. 10899 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 10900 10901 if (!Current.insert(Canonical)) 10902 return; 10903 10904 // We know that beyond here, we aren't chaining into a cycle. 10905 if (!Target || !Target->isDelegatingConstructor() || 10906 Target->isInvalidDecl() || Valid.count(TCanonical)) { 10907 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10908 Valid.insert(*CI); 10909 Current.clear(); 10910 // We've hit a cycle. 10911 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 10912 Current.count(TCanonical)) { 10913 // If we haven't diagnosed this cycle yet, do so now. 10914 if (!Invalid.count(TCanonical)) { 10915 S.Diag((*Ctor->init_begin())->getSourceLocation(), 10916 diag::warn_delegating_ctor_cycle) 10917 << Ctor; 10918 10919 // Don't add a note for a function delegating directo to itself. 10920 if (TCanonical != Canonical) 10921 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 10922 10923 CXXConstructorDecl *C = Target; 10924 while (C->getCanonicalDecl() != Canonical) { 10925 (void)C->getTargetConstructor()->hasBody(FNTarget); 10926 assert(FNTarget && "Ctor cycle through bodiless function"); 10927 10928 C 10929 = const_cast<CXXConstructorDecl*>(cast<CXXConstructorDecl>(FNTarget)); 10930 S.Diag(C->getLocation(), diag::note_which_delegates_to); 10931 } 10932 } 10933 10934 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 10935 Invalid.insert(*CI); 10936 Current.clear(); 10937 } else { 10938 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 10939 } 10940} 10941 10942 10943void Sema::CheckDelegatingCtorCycles() { 10944 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 10945 10946 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 10947 CE = Current.end(); 10948 10949 for (DelegatingCtorDeclsType::iterator 10950 I = DelegatingCtorDecls.begin(ExternalSource), 10951 E = DelegatingCtorDecls.end(); 10952 I != E; ++I) { 10953 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 10954 } 10955 10956 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 10957 (*CI)->setInvalidDecl(); 10958} 10959 10960namespace { 10961 /// \brief AST visitor that finds references to the 'this' expression. 10962 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 10963 Sema &S; 10964 10965 public: 10966 explicit FindCXXThisExpr(Sema &S) : S(S) { } 10967 10968 bool VisitCXXThisExpr(CXXThisExpr *E) { 10969 S.Diag(E->getLocation(), diag::err_this_static_member_func) 10970 << E->isImplicit(); 10971 return false; 10972 } 10973 }; 10974} 10975 10976bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 10977 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 10978 if (!TSInfo) 10979 return false; 10980 10981 TypeLoc TL = TSInfo->getTypeLoc(); 10982 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 10983 if (!ProtoTL) 10984 return false; 10985 10986 // C++11 [expr.prim.general]p3: 10987 // [The expression this] shall not appear before the optional 10988 // cv-qualifier-seq and it shall not appear within the declaration of a 10989 // static member function (although its type and value category are defined 10990 // within a static member function as they are within a non-static member 10991 // function). [ Note: this is because declaration matching does not occur 10992 // until the complete declarator is known. - end note ] 10993 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 10994 FindCXXThisExpr Finder(*this); 10995 10996 // If the return type came after the cv-qualifier-seq, check it now. 10997 if (Proto->hasTrailingReturn() && 10998 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 10999 return true; 11000 11001 // Check the exception specification. 11002 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11003 return true; 11004 11005 return checkThisInStaticMemberFunctionAttributes(Method); 11006} 11007 11008bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11009 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11010 if (!TSInfo) 11011 return false; 11012 11013 TypeLoc TL = TSInfo->getTypeLoc(); 11014 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11015 if (!ProtoTL) 11016 return false; 11017 11018 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11019 FindCXXThisExpr Finder(*this); 11020 11021 switch (Proto->getExceptionSpecType()) { 11022 case EST_Uninstantiated: 11023 case EST_BasicNoexcept: 11024 case EST_Delayed: 11025 case EST_DynamicNone: 11026 case EST_MSAny: 11027 case EST_None: 11028 break; 11029 11030 case EST_ComputedNoexcept: 11031 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11032 return true; 11033 11034 case EST_Dynamic: 11035 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11036 EEnd = Proto->exception_end(); 11037 E != EEnd; ++E) { 11038 if (!Finder.TraverseType(*E)) 11039 return true; 11040 } 11041 break; 11042 } 11043 11044 return false; 11045} 11046 11047bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11048 FindCXXThisExpr Finder(*this); 11049 11050 // Check attributes. 11051 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11052 A != AEnd; ++A) { 11053 // FIXME: This should be emitted by tblgen. 11054 Expr *Arg = 0; 11055 ArrayRef<Expr *> Args; 11056 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11057 Arg = G->getArg(); 11058 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11059 Arg = G->getArg(); 11060 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11061 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11062 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11063 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11064 else if (ExclusiveLockFunctionAttr *ELF 11065 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11066 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11067 else if (SharedLockFunctionAttr *SLF 11068 = dyn_cast<SharedLockFunctionAttr>(*A)) 11069 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11070 else if (ExclusiveTrylockFunctionAttr *ETLF 11071 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11072 Arg = ETLF->getSuccessValue(); 11073 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11074 } else if (SharedTrylockFunctionAttr *STLF 11075 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11076 Arg = STLF->getSuccessValue(); 11077 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11078 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11079 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11080 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11081 Arg = LR->getArg(); 11082 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11083 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11084 else if (ExclusiveLocksRequiredAttr *ELR 11085 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11086 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11087 else if (SharedLocksRequiredAttr *SLR 11088 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11089 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11090 11091 if (Arg && !Finder.TraverseStmt(Arg)) 11092 return true; 11093 11094 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11095 if (!Finder.TraverseStmt(Args[I])) 11096 return true; 11097 } 11098 } 11099 11100 return false; 11101} 11102 11103void 11104Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11105 ArrayRef<ParsedType> DynamicExceptions, 11106 ArrayRef<SourceRange> DynamicExceptionRanges, 11107 Expr *NoexceptExpr, 11108 llvm::SmallVectorImpl<QualType> &Exceptions, 11109 FunctionProtoType::ExtProtoInfo &EPI) { 11110 Exceptions.clear(); 11111 EPI.ExceptionSpecType = EST; 11112 if (EST == EST_Dynamic) { 11113 Exceptions.reserve(DynamicExceptions.size()); 11114 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11115 // FIXME: Preserve type source info. 11116 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11117 11118 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11119 collectUnexpandedParameterPacks(ET, Unexpanded); 11120 if (!Unexpanded.empty()) { 11121 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11122 UPPC_ExceptionType, 11123 Unexpanded); 11124 continue; 11125 } 11126 11127 // Check that the type is valid for an exception spec, and 11128 // drop it if not. 11129 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11130 Exceptions.push_back(ET); 11131 } 11132 EPI.NumExceptions = Exceptions.size(); 11133 EPI.Exceptions = Exceptions.data(); 11134 return; 11135 } 11136 11137 if (EST == EST_ComputedNoexcept) { 11138 // If an error occurred, there's no expression here. 11139 if (NoexceptExpr) { 11140 assert((NoexceptExpr->isTypeDependent() || 11141 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11142 Context.BoolTy) && 11143 "Parser should have made sure that the expression is boolean"); 11144 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11145 EPI.ExceptionSpecType = EST_BasicNoexcept; 11146 return; 11147 } 11148 11149 if (!NoexceptExpr->isValueDependent()) 11150 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11151 diag::err_noexcept_needs_constant_expression, 11152 /*AllowFold*/ false).take(); 11153 EPI.NoexceptExpr = NoexceptExpr; 11154 } 11155 return; 11156 } 11157} 11158 11159/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11160Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11161 // Implicitly declared functions (e.g. copy constructors) are 11162 // __host__ __device__ 11163 if (D->isImplicit()) 11164 return CFT_HostDevice; 11165 11166 if (D->hasAttr<CUDAGlobalAttr>()) 11167 return CFT_Global; 11168 11169 if (D->hasAttr<CUDADeviceAttr>()) { 11170 if (D->hasAttr<CUDAHostAttr>()) 11171 return CFT_HostDevice; 11172 else 11173 return CFT_Device; 11174 } 11175 11176 return CFT_Host; 11177} 11178 11179bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11180 CUDAFunctionTarget CalleeTarget) { 11181 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11182 // Callable from the device only." 11183 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11184 return true; 11185 11186 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11187 // Callable from the host only." 11188 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11189 // Callable from the host only." 11190 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11191 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11192 return true; 11193 11194 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11195 return true; 11196 11197 return false; 11198} 11199