| File: | src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaDeclCXX.cpp |
| Warning: | line 13331, column 26 Called C++ object pointer is null |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | //===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// |
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | // This file implements semantic analysis for C++ declarations. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #include "clang/AST/ASTConsumer.h" |
| 14 | #include "clang/AST/ASTContext.h" |
| 15 | #include "clang/AST/ASTLambda.h" |
| 16 | #include "clang/AST/ASTMutationListener.h" |
| 17 | #include "clang/AST/CXXInheritance.h" |
| 18 | #include "clang/AST/CharUnits.h" |
| 19 | #include "clang/AST/ComparisonCategories.h" |
| 20 | #include "clang/AST/EvaluatedExprVisitor.h" |
| 21 | #include "clang/AST/ExprCXX.h" |
| 22 | #include "clang/AST/RecordLayout.h" |
| 23 | #include "clang/AST/RecursiveASTVisitor.h" |
| 24 | #include "clang/AST/StmtVisitor.h" |
| 25 | #include "clang/AST/TypeLoc.h" |
| 26 | #include "clang/AST/TypeOrdering.h" |
| 27 | #include "clang/Basic/AttributeCommonInfo.h" |
| 28 | #include "clang/Basic/PartialDiagnostic.h" |
| 29 | #include "clang/Basic/TargetInfo.h" |
| 30 | #include "clang/Lex/LiteralSupport.h" |
| 31 | #include "clang/Lex/Preprocessor.h" |
| 32 | #include "clang/Sema/CXXFieldCollector.h" |
| 33 | #include "clang/Sema/DeclSpec.h" |
| 34 | #include "clang/Sema/Initialization.h" |
| 35 | #include "clang/Sema/Lookup.h" |
| 36 | #include "clang/Sema/ParsedTemplate.h" |
| 37 | #include "clang/Sema/Scope.h" |
| 38 | #include "clang/Sema/ScopeInfo.h" |
| 39 | #include "clang/Sema/SemaInternal.h" |
| 40 | #include "clang/Sema/Template.h" |
| 41 | #include "llvm/ADT/ScopeExit.h" |
| 42 | #include "llvm/ADT/SmallString.h" |
| 43 | #include "llvm/ADT/STLExtras.h" |
| 44 | #include "llvm/ADT/StringExtras.h" |
| 45 | #include <map> |
| 46 | #include <set> |
| 47 | |
| 48 | using namespace clang; |
| 49 | |
| 50 | //===----------------------------------------------------------------------===// |
| 51 | // CheckDefaultArgumentVisitor |
| 52 | //===----------------------------------------------------------------------===// |
| 53 | |
| 54 | namespace { |
| 55 | /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses |
| 56 | /// the default argument of a parameter to determine whether it |
| 57 | /// contains any ill-formed subexpressions. For example, this will |
| 58 | /// diagnose the use of local variables or parameters within the |
| 59 | /// default argument expression. |
| 60 | class CheckDefaultArgumentVisitor |
| 61 | : public ConstStmtVisitor<CheckDefaultArgumentVisitor, bool> { |
| 62 | Sema &S; |
| 63 | const Expr *DefaultArg; |
| 64 | |
| 65 | public: |
| 66 | CheckDefaultArgumentVisitor(Sema &S, const Expr *DefaultArg) |
| 67 | : S(S), DefaultArg(DefaultArg) {} |
| 68 | |
| 69 | bool VisitExpr(const Expr *Node); |
| 70 | bool VisitDeclRefExpr(const DeclRefExpr *DRE); |
| 71 | bool VisitCXXThisExpr(const CXXThisExpr *ThisE); |
| 72 | bool VisitLambdaExpr(const LambdaExpr *Lambda); |
| 73 | bool VisitPseudoObjectExpr(const PseudoObjectExpr *POE); |
| 74 | }; |
| 75 | |
| 76 | /// VisitExpr - Visit all of the children of this expression. |
| 77 | bool CheckDefaultArgumentVisitor::VisitExpr(const Expr *Node) { |
| 78 | bool IsInvalid = false; |
| 79 | for (const Stmt *SubStmt : Node->children()) |
| 80 | IsInvalid |= Visit(SubStmt); |
| 81 | return IsInvalid; |
| 82 | } |
| 83 | |
| 84 | /// VisitDeclRefExpr - Visit a reference to a declaration, to |
| 85 | /// determine whether this declaration can be used in the default |
| 86 | /// argument expression. |
| 87 | bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(const DeclRefExpr *DRE) { |
| 88 | const NamedDecl *Decl = DRE->getDecl(); |
| 89 | if (const auto *Param = dyn_cast<ParmVarDecl>(Decl)) { |
| 90 | // C++ [dcl.fct.default]p9: |
| 91 | // [...] parameters of a function shall not be used in default |
| 92 | // argument expressions, even if they are not evaluated. [...] |
| 93 | // |
| 94 | // C++17 [dcl.fct.default]p9 (by CWG 2082): |
| 95 | // [...] A parameter shall not appear as a potentially-evaluated |
| 96 | // expression in a default argument. [...] |
| 97 | // |
| 98 | if (DRE->isNonOdrUse() != NOUR_Unevaluated) |
| 99 | return S.Diag(DRE->getBeginLoc(), |
| 100 | diag::err_param_default_argument_references_param) |
| 101 | << Param->getDeclName() << DefaultArg->getSourceRange(); |
| 102 | } else if (const auto *VDecl = dyn_cast<VarDecl>(Decl)) { |
| 103 | // C++ [dcl.fct.default]p7: |
| 104 | // Local variables shall not be used in default argument |
| 105 | // expressions. |
| 106 | // |
| 107 | // C++17 [dcl.fct.default]p7 (by CWG 2082): |
| 108 | // A local variable shall not appear as a potentially-evaluated |
| 109 | // expression in a default argument. |
| 110 | // |
| 111 | // C++20 [dcl.fct.default]p7 (DR as part of P0588R1, see also CWG 2346): |
| 112 | // Note: A local variable cannot be odr-used (6.3) in a default argument. |
| 113 | // |
| 114 | if (VDecl->isLocalVarDecl() && !DRE->isNonOdrUse()) |
| 115 | return S.Diag(DRE->getBeginLoc(), |
| 116 | diag::err_param_default_argument_references_local) |
| 117 | << VDecl->getDeclName() << DefaultArg->getSourceRange(); |
| 118 | } |
| 119 | |
| 120 | return false; |
| 121 | } |
| 122 | |
| 123 | /// VisitCXXThisExpr - Visit a C++ "this" expression. |
| 124 | bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(const CXXThisExpr *ThisE) { |
| 125 | // C++ [dcl.fct.default]p8: |
| 126 | // The keyword this shall not be used in a default argument of a |
| 127 | // member function. |
| 128 | return S.Diag(ThisE->getBeginLoc(), |
| 129 | diag::err_param_default_argument_references_this) |
| 130 | << ThisE->getSourceRange(); |
| 131 | } |
| 132 | |
| 133 | bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr( |
| 134 | const PseudoObjectExpr *POE) { |
| 135 | bool Invalid = false; |
| 136 | for (const Expr *E : POE->semantics()) { |
| 137 | // Look through bindings. |
| 138 | if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E)) { |
| 139 | E = OVE->getSourceExpr(); |
| 140 | assert(E && "pseudo-object binding without source expression?")((void)0); |
| 141 | } |
| 142 | |
| 143 | Invalid |= Visit(E); |
| 144 | } |
| 145 | return Invalid; |
| 146 | } |
| 147 | |
| 148 | bool CheckDefaultArgumentVisitor::VisitLambdaExpr(const LambdaExpr *Lambda) { |
| 149 | // C++11 [expr.lambda.prim]p13: |
| 150 | // A lambda-expression appearing in a default argument shall not |
| 151 | // implicitly or explicitly capture any entity. |
| 152 | if (Lambda->capture_begin() == Lambda->capture_end()) |
| 153 | return false; |
| 154 | |
| 155 | return S.Diag(Lambda->getBeginLoc(), diag::err_lambda_capture_default_arg); |
| 156 | } |
| 157 | } // namespace |
| 158 | |
| 159 | void |
| 160 | Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, |
| 161 | const CXXMethodDecl *Method) { |
| 162 | // If we have an MSAny spec already, don't bother. |
| 163 | if (!Method || ComputedEST == EST_MSAny) |
| 164 | return; |
| 165 | |
| 166 | const FunctionProtoType *Proto |
| 167 | = Method->getType()->getAs<FunctionProtoType>(); |
| 168 | Proto = Self->ResolveExceptionSpec(CallLoc, Proto); |
| 169 | if (!Proto) |
| 170 | return; |
| 171 | |
| 172 | ExceptionSpecificationType EST = Proto->getExceptionSpecType(); |
| 173 | |
| 174 | // If we have a throw-all spec at this point, ignore the function. |
| 175 | if (ComputedEST == EST_None) |
| 176 | return; |
| 177 | |
| 178 | if (EST == EST_None && Method->hasAttr<NoThrowAttr>()) |
| 179 | EST = EST_BasicNoexcept; |
| 180 | |
| 181 | switch (EST) { |
| 182 | case EST_Unparsed: |
| 183 | case EST_Uninstantiated: |
| 184 | case EST_Unevaluated: |
| 185 | llvm_unreachable("should not see unresolved exception specs here")__builtin_unreachable(); |
| 186 | |
| 187 | // If this function can throw any exceptions, make a note of that. |
| 188 | case EST_MSAny: |
| 189 | case EST_None: |
| 190 | // FIXME: Whichever we see last of MSAny and None determines our result. |
| 191 | // We should make a consistent, order-independent choice here. |
| 192 | ClearExceptions(); |
| 193 | ComputedEST = EST; |
| 194 | return; |
| 195 | case EST_NoexceptFalse: |
| 196 | ClearExceptions(); |
| 197 | ComputedEST = EST_None; |
| 198 | return; |
| 199 | // FIXME: If the call to this decl is using any of its default arguments, we |
| 200 | // need to search them for potentially-throwing calls. |
| 201 | // If this function has a basic noexcept, it doesn't affect the outcome. |
| 202 | case EST_BasicNoexcept: |
| 203 | case EST_NoexceptTrue: |
| 204 | case EST_NoThrow: |
| 205 | return; |
| 206 | // If we're still at noexcept(true) and there's a throw() callee, |
| 207 | // change to that specification. |
| 208 | case EST_DynamicNone: |
| 209 | if (ComputedEST == EST_BasicNoexcept) |
| 210 | ComputedEST = EST_DynamicNone; |
| 211 | return; |
| 212 | case EST_DependentNoexcept: |
| 213 | llvm_unreachable(__builtin_unreachable() |
| 214 | "should not generate implicit declarations for dependent cases")__builtin_unreachable(); |
| 215 | case EST_Dynamic: |
| 216 | break; |
| 217 | } |
| 218 | assert(EST == EST_Dynamic && "EST case not considered earlier.")((void)0); |
| 219 | assert(ComputedEST != EST_None &&((void)0) |
| 220 | "Shouldn't collect exceptions when throw-all is guaranteed.")((void)0); |
| 221 | ComputedEST = EST_Dynamic; |
| 222 | // Record the exceptions in this function's exception specification. |
| 223 | for (const auto &E : Proto->exceptions()) |
| 224 | if (ExceptionsSeen.insert(Self->Context.getCanonicalType(E)).second) |
| 225 | Exceptions.push_back(E); |
| 226 | } |
| 227 | |
| 228 | void Sema::ImplicitExceptionSpecification::CalledStmt(Stmt *S) { |
| 229 | if (!S || ComputedEST == EST_MSAny) |
| 230 | return; |
| 231 | |
| 232 | // FIXME: |
| 233 | // |
| 234 | // C++0x [except.spec]p14: |
| 235 | // [An] implicit exception-specification specifies the type-id T if and |
| 236 | // only if T is allowed by the exception-specification of a function directly |
| 237 | // invoked by f's implicit definition; f shall allow all exceptions if any |
| 238 | // function it directly invokes allows all exceptions, and f shall allow no |
| 239 | // exceptions if every function it directly invokes allows no exceptions. |
| 240 | // |
| 241 | // Note in particular that if an implicit exception-specification is generated |
| 242 | // for a function containing a throw-expression, that specification can still |
| 243 | // be noexcept(true). |
| 244 | // |
| 245 | // Note also that 'directly invoked' is not defined in the standard, and there |
| 246 | // is no indication that we should only consider potentially-evaluated calls. |
| 247 | // |
| 248 | // Ultimately we should implement the intent of the standard: the exception |
| 249 | // specification should be the set of exceptions which can be thrown by the |
| 250 | // implicit definition. For now, we assume that any non-nothrow expression can |
| 251 | // throw any exception. |
| 252 | |
| 253 | if (Self->canThrow(S)) |
| 254 | ComputedEST = EST_None; |
| 255 | } |
| 256 | |
| 257 | ExprResult Sema::ConvertParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, |
| 258 | SourceLocation EqualLoc) { |
| 259 | if (RequireCompleteType(Param->getLocation(), Param->getType(), |
| 260 | diag::err_typecheck_decl_incomplete_type)) |
| 261 | return true; |
| 262 | |
| 263 | // C++ [dcl.fct.default]p5 |
| 264 | // A default argument expression is implicitly converted (clause |
| 265 | // 4) to the parameter type. The default argument expression has |
| 266 | // the same semantic constraints as the initializer expression in |
| 267 | // a declaration of a variable of the parameter type, using the |
| 268 | // copy-initialization semantics (8.5). |
| 269 | InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, |
| 270 | Param); |
| 271 | InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), |
| 272 | EqualLoc); |
| 273 | InitializationSequence InitSeq(*this, Entity, Kind, Arg); |
| 274 | ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); |
| 275 | if (Result.isInvalid()) |
| 276 | return true; |
| 277 | Arg = Result.getAs<Expr>(); |
| 278 | |
| 279 | CheckCompletedExpr(Arg, EqualLoc); |
| 280 | Arg = MaybeCreateExprWithCleanups(Arg); |
| 281 | |
| 282 | return Arg; |
| 283 | } |
| 284 | |
| 285 | void Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, |
| 286 | SourceLocation EqualLoc) { |
| 287 | // Add the default argument to the parameter |
| 288 | Param->setDefaultArg(Arg); |
| 289 | |
| 290 | // We have already instantiated this parameter; provide each of the |
| 291 | // instantiations with the uninstantiated default argument. |
| 292 | UnparsedDefaultArgInstantiationsMap::iterator InstPos |
| 293 | = UnparsedDefaultArgInstantiations.find(Param); |
| 294 | if (InstPos != UnparsedDefaultArgInstantiations.end()) { |
| 295 | for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) |
| 296 | InstPos->second[I]->setUninstantiatedDefaultArg(Arg); |
| 297 | |
| 298 | // We're done tracking this parameter's instantiations. |
| 299 | UnparsedDefaultArgInstantiations.erase(InstPos); |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | /// ActOnParamDefaultArgument - Check whether the default argument |
| 304 | /// provided for a function parameter is well-formed. If so, attach it |
| 305 | /// to the parameter declaration. |
| 306 | void |
| 307 | Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, |
| 308 | Expr *DefaultArg) { |
| 309 | if (!param || !DefaultArg) |
| 310 | return; |
| 311 | |
| 312 | ParmVarDecl *Param = cast<ParmVarDecl>(param); |
| 313 | UnparsedDefaultArgLocs.erase(Param); |
| 314 | |
| 315 | auto Fail = [&] { |
| 316 | Param->setInvalidDecl(); |
| 317 | Param->setDefaultArg(new (Context) OpaqueValueExpr( |
| 318 | EqualLoc, Param->getType().getNonReferenceType(), VK_PRValue)); |
| 319 | }; |
| 320 | |
| 321 | // Default arguments are only permitted in C++ |
| 322 | if (!getLangOpts().CPlusPlus) { |
| 323 | Diag(EqualLoc, diag::err_param_default_argument) |
| 324 | << DefaultArg->getSourceRange(); |
| 325 | return Fail(); |
| 326 | } |
| 327 | |
| 328 | // Check for unexpanded parameter packs. |
| 329 | if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { |
| 330 | return Fail(); |
| 331 | } |
| 332 | |
| 333 | // C++11 [dcl.fct.default]p3 |
| 334 | // A default argument expression [...] shall not be specified for a |
| 335 | // parameter pack. |
| 336 | if (Param->isParameterPack()) { |
| 337 | Diag(EqualLoc, diag::err_param_default_argument_on_parameter_pack) |
| 338 | << DefaultArg->getSourceRange(); |
| 339 | // Recover by discarding the default argument. |
| 340 | Param->setDefaultArg(nullptr); |
| 341 | return; |
| 342 | } |
| 343 | |
| 344 | ExprResult Result = ConvertParamDefaultArgument(Param, DefaultArg, EqualLoc); |
| 345 | if (Result.isInvalid()) |
| 346 | return Fail(); |
| 347 | |
| 348 | DefaultArg = Result.getAs<Expr>(); |
| 349 | |
| 350 | // Check that the default argument is well-formed |
| 351 | CheckDefaultArgumentVisitor DefaultArgChecker(*this, DefaultArg); |
| 352 | if (DefaultArgChecker.Visit(DefaultArg)) |
| 353 | return Fail(); |
| 354 | |
| 355 | SetParamDefaultArgument(Param, DefaultArg, EqualLoc); |
| 356 | } |
| 357 | |
| 358 | /// ActOnParamUnparsedDefaultArgument - We've seen a default |
| 359 | /// argument for a function parameter, but we can't parse it yet |
| 360 | /// because we're inside a class definition. Note that this default |
| 361 | /// argument will be parsed later. |
| 362 | void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, |
| 363 | SourceLocation EqualLoc, |
| 364 | SourceLocation ArgLoc) { |
| 365 | if (!param) |
| 366 | return; |
| 367 | |
| 368 | ParmVarDecl *Param = cast<ParmVarDecl>(param); |
| 369 | Param->setUnparsedDefaultArg(); |
| 370 | UnparsedDefaultArgLocs[Param] = ArgLoc; |
| 371 | } |
| 372 | |
| 373 | /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of |
| 374 | /// the default argument for the parameter param failed. |
| 375 | void Sema::ActOnParamDefaultArgumentError(Decl *param, |
| 376 | SourceLocation EqualLoc) { |
| 377 | if (!param) |
| 378 | return; |
| 379 | |
| 380 | ParmVarDecl *Param = cast<ParmVarDecl>(param); |
| 381 | Param->setInvalidDecl(); |
| 382 | UnparsedDefaultArgLocs.erase(Param); |
| 383 | Param->setDefaultArg(new (Context) OpaqueValueExpr( |
| 384 | EqualLoc, Param->getType().getNonReferenceType(), VK_PRValue)); |
| 385 | } |
| 386 | |
| 387 | /// CheckExtraCXXDefaultArguments - Check for any extra default |
| 388 | /// arguments in the declarator, which is not a function declaration |
| 389 | /// or definition and therefore is not permitted to have default |
| 390 | /// arguments. This routine should be invoked for every declarator |
| 391 | /// that is not a function declaration or definition. |
| 392 | void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { |
| 393 | // C++ [dcl.fct.default]p3 |
| 394 | // A default argument expression shall be specified only in the |
| 395 | // parameter-declaration-clause of a function declaration or in a |
| 396 | // template-parameter (14.1). It shall not be specified for a |
| 397 | // parameter pack. If it is specified in a |
| 398 | // parameter-declaration-clause, it shall not occur within a |
| 399 | // declarator or abstract-declarator of a parameter-declaration. |
| 400 | bool MightBeFunction = D.isFunctionDeclarationContext(); |
| 401 | for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { |
| 402 | DeclaratorChunk &chunk = D.getTypeObject(i); |
| 403 | if (chunk.Kind == DeclaratorChunk::Function) { |
| 404 | if (MightBeFunction) { |
| 405 | // This is a function declaration. It can have default arguments, but |
| 406 | // keep looking in case its return type is a function type with default |
| 407 | // arguments. |
| 408 | MightBeFunction = false; |
| 409 | continue; |
| 410 | } |
| 411 | for (unsigned argIdx = 0, e = chunk.Fun.NumParams; argIdx != e; |
| 412 | ++argIdx) { |
| 413 | ParmVarDecl *Param = cast<ParmVarDecl>(chunk.Fun.Params[argIdx].Param); |
| 414 | if (Param->hasUnparsedDefaultArg()) { |
| 415 | std::unique_ptr<CachedTokens> Toks = |
| 416 | std::move(chunk.Fun.Params[argIdx].DefaultArgTokens); |
| 417 | SourceRange SR; |
| 418 | if (Toks->size() > 1) |
| 419 | SR = SourceRange((*Toks)[1].getLocation(), |
| 420 | Toks->back().getLocation()); |
| 421 | else |
| 422 | SR = UnparsedDefaultArgLocs[Param]; |
| 423 | Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) |
| 424 | << SR; |
| 425 | } else if (Param->getDefaultArg()) { |
| 426 | Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) |
| 427 | << Param->getDefaultArg()->getSourceRange(); |
| 428 | Param->setDefaultArg(nullptr); |
| 429 | } |
| 430 | } |
| 431 | } else if (chunk.Kind != DeclaratorChunk::Paren) { |
| 432 | MightBeFunction = false; |
| 433 | } |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) { |
| 438 | return std::any_of(FD->param_begin(), FD->param_end(), [](ParmVarDecl *P) { |
| 439 | return P->hasDefaultArg() && !P->hasInheritedDefaultArg(); |
| 440 | }); |
| 441 | } |
| 442 | |
| 443 | /// MergeCXXFunctionDecl - Merge two declarations of the same C++ |
| 444 | /// function, once we already know that they have the same |
| 445 | /// type. Subroutine of MergeFunctionDecl. Returns true if there was an |
| 446 | /// error, false otherwise. |
| 447 | bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, |
| 448 | Scope *S) { |
| 449 | bool Invalid = false; |
| 450 | |
| 451 | // The declaration context corresponding to the scope is the semantic |
| 452 | // parent, unless this is a local function declaration, in which case |
| 453 | // it is that surrounding function. |
| 454 | DeclContext *ScopeDC = New->isLocalExternDecl() |
| 455 | ? New->getLexicalDeclContext() |
| 456 | : New->getDeclContext(); |
| 457 | |
| 458 | // Find the previous declaration for the purpose of default arguments. |
| 459 | FunctionDecl *PrevForDefaultArgs = Old; |
| 460 | for (/**/; PrevForDefaultArgs; |
| 461 | // Don't bother looking back past the latest decl if this is a local |
| 462 | // extern declaration; nothing else could work. |
| 463 | PrevForDefaultArgs = New->isLocalExternDecl() |
| 464 | ? nullptr |
| 465 | : PrevForDefaultArgs->getPreviousDecl()) { |
| 466 | // Ignore hidden declarations. |
| 467 | if (!LookupResult::isVisible(*this, PrevForDefaultArgs)) |
| 468 | continue; |
| 469 | |
| 470 | if (S && !isDeclInScope(PrevForDefaultArgs, ScopeDC, S) && |
| 471 | !New->isCXXClassMember()) { |
| 472 | // Ignore default arguments of old decl if they are not in |
| 473 | // the same scope and this is not an out-of-line definition of |
| 474 | // a member function. |
| 475 | continue; |
| 476 | } |
| 477 | |
| 478 | if (PrevForDefaultArgs->isLocalExternDecl() != New->isLocalExternDecl()) { |
| 479 | // If only one of these is a local function declaration, then they are |
| 480 | // declared in different scopes, even though isDeclInScope may think |
| 481 | // they're in the same scope. (If both are local, the scope check is |
| 482 | // sufficient, and if neither is local, then they are in the same scope.) |
| 483 | continue; |
| 484 | } |
| 485 | |
| 486 | // We found the right previous declaration. |
| 487 | break; |
| 488 | } |
| 489 | |
| 490 | // C++ [dcl.fct.default]p4: |
| 491 | // For non-template functions, default arguments can be added in |
| 492 | // later declarations of a function in the same |
| 493 | // scope. Declarations in different scopes have completely |
| 494 | // distinct sets of default arguments. That is, declarations in |
| 495 | // inner scopes do not acquire default arguments from |
| 496 | // declarations in outer scopes, and vice versa. In a given |
| 497 | // function declaration, all parameters subsequent to a |
| 498 | // parameter with a default argument shall have default |
| 499 | // arguments supplied in this or previous declarations. A |
| 500 | // default argument shall not be redefined by a later |
| 501 | // declaration (not even to the same value). |
| 502 | // |
| 503 | // C++ [dcl.fct.default]p6: |
| 504 | // Except for member functions of class templates, the default arguments |
| 505 | // in a member function definition that appears outside of the class |
| 506 | // definition are added to the set of default arguments provided by the |
| 507 | // member function declaration in the class definition. |
| 508 | for (unsigned p = 0, NumParams = PrevForDefaultArgs |
| 509 | ? PrevForDefaultArgs->getNumParams() |
| 510 | : 0; |
| 511 | p < NumParams; ++p) { |
| 512 | ParmVarDecl *OldParam = PrevForDefaultArgs->getParamDecl(p); |
| 513 | ParmVarDecl *NewParam = New->getParamDecl(p); |
| 514 | |
| 515 | bool OldParamHasDfl = OldParam ? OldParam->hasDefaultArg() : false; |
| 516 | bool NewParamHasDfl = NewParam->hasDefaultArg(); |
| 517 | |
| 518 | if (OldParamHasDfl && NewParamHasDfl) { |
| 519 | unsigned DiagDefaultParamID = |
| 520 | diag::err_param_default_argument_redefinition; |
| 521 | |
| 522 | // MSVC accepts that default parameters be redefined for member functions |
| 523 | // of template class. The new default parameter's value is ignored. |
| 524 | Invalid = true; |
| 525 | if (getLangOpts().MicrosoftExt) { |
| 526 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(New); |
| 527 | if (MD && MD->getParent()->getDescribedClassTemplate()) { |
| 528 | // Merge the old default argument into the new parameter. |
| 529 | NewParam->setHasInheritedDefaultArg(); |
| 530 | if (OldParam->hasUninstantiatedDefaultArg()) |
| 531 | NewParam->setUninstantiatedDefaultArg( |
| 532 | OldParam->getUninstantiatedDefaultArg()); |
| 533 | else |
| 534 | NewParam->setDefaultArg(OldParam->getInit()); |
| 535 | DiagDefaultParamID = diag::ext_param_default_argument_redefinition; |
| 536 | Invalid = false; |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | // FIXME: If we knew where the '=' was, we could easily provide a fix-it |
| 541 | // hint here. Alternatively, we could walk the type-source information |
| 542 | // for NewParam to find the last source location in the type... but it |
| 543 | // isn't worth the effort right now. This is the kind of test case that |
| 544 | // is hard to get right: |
| 545 | // int f(int); |
| 546 | // void g(int (*fp)(int) = f); |
| 547 | // void g(int (*fp)(int) = &f); |
| 548 | Diag(NewParam->getLocation(), DiagDefaultParamID) |
| 549 | << NewParam->getDefaultArgRange(); |
| 550 | |
| 551 | // Look for the function declaration where the default argument was |
| 552 | // actually written, which may be a declaration prior to Old. |
| 553 | for (auto Older = PrevForDefaultArgs; |
| 554 | OldParam->hasInheritedDefaultArg(); /**/) { |
| 555 | Older = Older->getPreviousDecl(); |
| 556 | OldParam = Older->getParamDecl(p); |
| 557 | } |
| 558 | |
| 559 | Diag(OldParam->getLocation(), diag::note_previous_definition) |
| 560 | << OldParam->getDefaultArgRange(); |
| 561 | } else if (OldParamHasDfl) { |
| 562 | // Merge the old default argument into the new parameter unless the new |
| 563 | // function is a friend declaration in a template class. In the latter |
| 564 | // case the default arguments will be inherited when the friend |
| 565 | // declaration will be instantiated. |
| 566 | if (New->getFriendObjectKind() == Decl::FOK_None || |
| 567 | !New->getLexicalDeclContext()->isDependentContext()) { |
| 568 | // It's important to use getInit() here; getDefaultArg() |
| 569 | // strips off any top-level ExprWithCleanups. |
| 570 | NewParam->setHasInheritedDefaultArg(); |
| 571 | if (OldParam->hasUnparsedDefaultArg()) |
| 572 | NewParam->setUnparsedDefaultArg(); |
| 573 | else if (OldParam->hasUninstantiatedDefaultArg()) |
| 574 | NewParam->setUninstantiatedDefaultArg( |
| 575 | OldParam->getUninstantiatedDefaultArg()); |
| 576 | else |
| 577 | NewParam->setDefaultArg(OldParam->getInit()); |
| 578 | } |
| 579 | } else if (NewParamHasDfl) { |
| 580 | if (New->getDescribedFunctionTemplate()) { |
| 581 | // Paragraph 4, quoted above, only applies to non-template functions. |
| 582 | Diag(NewParam->getLocation(), |
| 583 | diag::err_param_default_argument_template_redecl) |
| 584 | << NewParam->getDefaultArgRange(); |
| 585 | Diag(PrevForDefaultArgs->getLocation(), |
| 586 | diag::note_template_prev_declaration) |
| 587 | << false; |
| 588 | } else if (New->getTemplateSpecializationKind() |
| 589 | != TSK_ImplicitInstantiation && |
| 590 | New->getTemplateSpecializationKind() != TSK_Undeclared) { |
| 591 | // C++ [temp.expr.spec]p21: |
| 592 | // Default function arguments shall not be specified in a declaration |
| 593 | // or a definition for one of the following explicit specializations: |
| 594 | // - the explicit specialization of a function template; |
| 595 | // - the explicit specialization of a member function template; |
| 596 | // - the explicit specialization of a member function of a class |
| 597 | // template where the class template specialization to which the |
| 598 | // member function specialization belongs is implicitly |
| 599 | // instantiated. |
| 600 | Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) |
| 601 | << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) |
| 602 | << New->getDeclName() |
| 603 | << NewParam->getDefaultArgRange(); |
| 604 | } else if (New->getDeclContext()->isDependentContext()) { |
| 605 | // C++ [dcl.fct.default]p6 (DR217): |
| 606 | // Default arguments for a member function of a class template shall |
| 607 | // be specified on the initial declaration of the member function |
| 608 | // within the class template. |
| 609 | // |
| 610 | // Reading the tea leaves a bit in DR217 and its reference to DR205 |
| 611 | // leads me to the conclusion that one cannot add default function |
| 612 | // arguments for an out-of-line definition of a member function of a |
| 613 | // dependent type. |
| 614 | int WhichKind = 2; |
| 615 | if (CXXRecordDecl *Record |
| 616 | = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { |
| 617 | if (Record->getDescribedClassTemplate()) |
| 618 | WhichKind = 0; |
| 619 | else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) |
| 620 | WhichKind = 1; |
| 621 | else |
| 622 | WhichKind = 2; |
| 623 | } |
| 624 | |
| 625 | Diag(NewParam->getLocation(), |
| 626 | diag::err_param_default_argument_member_template_redecl) |
| 627 | << WhichKind |
| 628 | << NewParam->getDefaultArgRange(); |
| 629 | } |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | // DR1344: If a default argument is added outside a class definition and that |
| 634 | // default argument makes the function a special member function, the program |
| 635 | // is ill-formed. This can only happen for constructors. |
| 636 | if (isa<CXXConstructorDecl>(New) && |
| 637 | New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { |
| 638 | CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), |
| 639 | OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); |
| 640 | if (NewSM != OldSM) { |
| 641 | ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); |
| 642 | assert(NewParam->hasDefaultArg())((void)0); |
| 643 | Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) |
| 644 | << NewParam->getDefaultArgRange() << NewSM; |
| 645 | Diag(Old->getLocation(), diag::note_previous_declaration); |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | const FunctionDecl *Def; |
| 650 | // C++11 [dcl.constexpr]p1: If any declaration of a function or function |
| 651 | // template has a constexpr specifier then all its declarations shall |
| 652 | // contain the constexpr specifier. |
| 653 | if (New->getConstexprKind() != Old->getConstexprKind()) { |
| 654 | Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) |
| 655 | << New << static_cast<int>(New->getConstexprKind()) |
| 656 | << static_cast<int>(Old->getConstexprKind()); |
| 657 | Diag(Old->getLocation(), diag::note_previous_declaration); |
| 658 | Invalid = true; |
| 659 | } else if (!Old->getMostRecentDecl()->isInlined() && New->isInlined() && |
| 660 | Old->isDefined(Def) && |
| 661 | // If a friend function is inlined but does not have 'inline' |
| 662 | // specifier, it is a definition. Do not report attribute conflict |
| 663 | // in this case, redefinition will be diagnosed later. |
| 664 | (New->isInlineSpecified() || |
| 665 | New->getFriendObjectKind() == Decl::FOK_None)) { |
| 666 | // C++11 [dcl.fcn.spec]p4: |
| 667 | // If the definition of a function appears in a translation unit before its |
| 668 | // first declaration as inline, the program is ill-formed. |
| 669 | Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New; |
| 670 | Diag(Def->getLocation(), diag::note_previous_definition); |
| 671 | Invalid = true; |
| 672 | } |
| 673 | |
| 674 | // C++17 [temp.deduct.guide]p3: |
| 675 | // Two deduction guide declarations in the same translation unit |
| 676 | // for the same class template shall not have equivalent |
| 677 | // parameter-declaration-clauses. |
| 678 | if (isa<CXXDeductionGuideDecl>(New) && |
| 679 | !New->isFunctionTemplateSpecialization() && isVisible(Old)) { |
| 680 | Diag(New->getLocation(), diag::err_deduction_guide_redeclared); |
| 681 | Diag(Old->getLocation(), diag::note_previous_declaration); |
| 682 | } |
| 683 | |
| 684 | // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default |
| 685 | // argument expression, that declaration shall be a definition and shall be |
| 686 | // the only declaration of the function or function template in the |
| 687 | // translation unit. |
| 688 | if (Old->getFriendObjectKind() == Decl::FOK_Undeclared && |
| 689 | functionDeclHasDefaultArgument(Old)) { |
| 690 | Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); |
| 691 | Diag(Old->getLocation(), diag::note_previous_declaration); |
| 692 | Invalid = true; |
| 693 | } |
| 694 | |
| 695 | // C++11 [temp.friend]p4 (DR329): |
| 696 | // When a function is defined in a friend function declaration in a class |
| 697 | // template, the function is instantiated when the function is odr-used. |
| 698 | // The same restrictions on multiple declarations and definitions that |
| 699 | // apply to non-template function declarations and definitions also apply |
| 700 | // to these implicit definitions. |
| 701 | const FunctionDecl *OldDefinition = nullptr; |
| 702 | if (New->isThisDeclarationInstantiatedFromAFriendDefinition() && |
| 703 | Old->isDefined(OldDefinition, true)) |
| 704 | CheckForFunctionRedefinition(New, OldDefinition); |
| 705 | |
| 706 | return Invalid; |
| 707 | } |
| 708 | |
| 709 | NamedDecl * |
| 710 | Sema::ActOnDecompositionDeclarator(Scope *S, Declarator &D, |
| 711 | MultiTemplateParamsArg TemplateParamLists) { |
| 712 | assert(D.isDecompositionDeclarator())((void)0); |
| 713 | const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator(); |
| 714 | |
| 715 | // The syntax only allows a decomposition declarator as a simple-declaration, |
| 716 | // a for-range-declaration, or a condition in Clang, but we parse it in more |
| 717 | // cases than that. |
| 718 | if (!D.mayHaveDecompositionDeclarator()) { |
| 719 | Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context) |
| 720 | << Decomp.getSourceRange(); |
| 721 | return nullptr; |
| 722 | } |
| 723 | |
| 724 | if (!TemplateParamLists.empty()) { |
| 725 | // FIXME: There's no rule against this, but there are also no rules that |
| 726 | // would actually make it usable, so we reject it for now. |
| 727 | Diag(TemplateParamLists.front()->getTemplateLoc(), |
| 728 | diag::err_decomp_decl_template); |
| 729 | return nullptr; |
| 730 | } |
| 731 | |
| 732 | Diag(Decomp.getLSquareLoc(), |
| 733 | !getLangOpts().CPlusPlus17 |
| 734 | ? diag::ext_decomp_decl |
| 735 | : D.getContext() == DeclaratorContext::Condition |
| 736 | ? diag::ext_decomp_decl_cond |
| 737 | : diag::warn_cxx14_compat_decomp_decl) |
| 738 | << Decomp.getSourceRange(); |
| 739 | |
| 740 | // The semantic context is always just the current context. |
| 741 | DeclContext *const DC = CurContext; |
| 742 | |
| 743 | // C++17 [dcl.dcl]/8: |
| 744 | // The decl-specifier-seq shall contain only the type-specifier auto |
| 745 | // and cv-qualifiers. |
| 746 | // C++2a [dcl.dcl]/8: |
| 747 | // If decl-specifier-seq contains any decl-specifier other than static, |
| 748 | // thread_local, auto, or cv-qualifiers, the program is ill-formed. |
| 749 | auto &DS = D.getDeclSpec(); |
| 750 | { |
| 751 | SmallVector<StringRef, 8> BadSpecifiers; |
| 752 | SmallVector<SourceLocation, 8> BadSpecifierLocs; |
| 753 | SmallVector<StringRef, 8> CPlusPlus20Specifiers; |
| 754 | SmallVector<SourceLocation, 8> CPlusPlus20SpecifierLocs; |
| 755 | if (auto SCS = DS.getStorageClassSpec()) { |
| 756 | if (SCS == DeclSpec::SCS_static) { |
| 757 | CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(SCS)); |
| 758 | CPlusPlus20SpecifierLocs.push_back(DS.getStorageClassSpecLoc()); |
| 759 | } else { |
| 760 | BadSpecifiers.push_back(DeclSpec::getSpecifierName(SCS)); |
| 761 | BadSpecifierLocs.push_back(DS.getStorageClassSpecLoc()); |
| 762 | } |
| 763 | } |
| 764 | if (auto TSCS = DS.getThreadStorageClassSpec()) { |
| 765 | CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(TSCS)); |
| 766 | CPlusPlus20SpecifierLocs.push_back(DS.getThreadStorageClassSpecLoc()); |
| 767 | } |
| 768 | if (DS.hasConstexprSpecifier()) { |
| 769 | BadSpecifiers.push_back( |
| 770 | DeclSpec::getSpecifierName(DS.getConstexprSpecifier())); |
| 771 | BadSpecifierLocs.push_back(DS.getConstexprSpecLoc()); |
| 772 | } |
| 773 | if (DS.isInlineSpecified()) { |
| 774 | BadSpecifiers.push_back("inline"); |
| 775 | BadSpecifierLocs.push_back(DS.getInlineSpecLoc()); |
| 776 | } |
| 777 | if (!BadSpecifiers.empty()) { |
| 778 | auto &&Err = Diag(BadSpecifierLocs.front(), diag::err_decomp_decl_spec); |
| 779 | Err << (int)BadSpecifiers.size() |
| 780 | << llvm::join(BadSpecifiers.begin(), BadSpecifiers.end(), " "); |
| 781 | // Don't add FixItHints to remove the specifiers; we do still respect |
| 782 | // them when building the underlying variable. |
| 783 | for (auto Loc : BadSpecifierLocs) |
| 784 | Err << SourceRange(Loc, Loc); |
| 785 | } else if (!CPlusPlus20Specifiers.empty()) { |
| 786 | auto &&Warn = Diag(CPlusPlus20SpecifierLocs.front(), |
| 787 | getLangOpts().CPlusPlus20 |
| 788 | ? diag::warn_cxx17_compat_decomp_decl_spec |
| 789 | : diag::ext_decomp_decl_spec); |
| 790 | Warn << (int)CPlusPlus20Specifiers.size() |
| 791 | << llvm::join(CPlusPlus20Specifiers.begin(), |
| 792 | CPlusPlus20Specifiers.end(), " "); |
| 793 | for (auto Loc : CPlusPlus20SpecifierLocs) |
| 794 | Warn << SourceRange(Loc, Loc); |
| 795 | } |
| 796 | // We can't recover from it being declared as a typedef. |
| 797 | if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) |
| 798 | return nullptr; |
| 799 | } |
| 800 | |
| 801 | // C++2a [dcl.struct.bind]p1: |
| 802 | // A cv that includes volatile is deprecated |
| 803 | if ((DS.getTypeQualifiers() & DeclSpec::TQ_volatile) && |
| 804 | getLangOpts().CPlusPlus20) |
| 805 | Diag(DS.getVolatileSpecLoc(), |
| 806 | diag::warn_deprecated_volatile_structured_binding); |
| 807 | |
| 808 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
| 809 | QualType R = TInfo->getType(); |
| 810 | |
| 811 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, |
| 812 | UPPC_DeclarationType)) |
| 813 | D.setInvalidType(); |
| 814 | |
| 815 | // The syntax only allows a single ref-qualifier prior to the decomposition |
| 816 | // declarator. No other declarator chunks are permitted. Also check the type |
| 817 | // specifier here. |
| 818 | if (DS.getTypeSpecType() != DeclSpec::TST_auto || |
| 819 | D.hasGroupingParens() || D.getNumTypeObjects() > 1 || |
| 820 | (D.getNumTypeObjects() == 1 && |
| 821 | D.getTypeObject(0).Kind != DeclaratorChunk::Reference)) { |
| 822 | Diag(Decomp.getLSquareLoc(), |
| 823 | (D.hasGroupingParens() || |
| 824 | (D.getNumTypeObjects() && |
| 825 | D.getTypeObject(0).Kind == DeclaratorChunk::Paren)) |
| 826 | ? diag::err_decomp_decl_parens |
| 827 | : diag::err_decomp_decl_type) |
| 828 | << R; |
| 829 | |
| 830 | // In most cases, there's no actual problem with an explicitly-specified |
| 831 | // type, but a function type won't work here, and ActOnVariableDeclarator |
| 832 | // shouldn't be called for such a type. |
| 833 | if (R->isFunctionType()) |
| 834 | D.setInvalidType(); |
| 835 | } |
| 836 | |
| 837 | // Build the BindingDecls. |
| 838 | SmallVector<BindingDecl*, 8> Bindings; |
| 839 | |
| 840 | // Build the BindingDecls. |
| 841 | for (auto &B : D.getDecompositionDeclarator().bindings()) { |
| 842 | // Check for name conflicts. |
| 843 | DeclarationNameInfo NameInfo(B.Name, B.NameLoc); |
| 844 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
| 845 | ForVisibleRedeclaration); |
| 846 | LookupName(Previous, S, |
| 847 | /*CreateBuiltins*/DC->getRedeclContext()->isTranslationUnit()); |
| 848 | |
| 849 | // It's not permitted to shadow a template parameter name. |
| 850 | if (Previous.isSingleResult() && |
| 851 | Previous.getFoundDecl()->isTemplateParameter()) { |
| 852 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), |
| 853 | Previous.getFoundDecl()); |
| 854 | Previous.clear(); |
| 855 | } |
| 856 | |
| 857 | auto *BD = BindingDecl::Create(Context, DC, B.NameLoc, B.Name); |
| 858 | |
| 859 | // Find the shadowed declaration before filtering for scope. |
| 860 | NamedDecl *ShadowedDecl = D.getCXXScopeSpec().isEmpty() |
| 861 | ? getShadowedDeclaration(BD, Previous) |
| 862 | : nullptr; |
| 863 | |
| 864 | bool ConsiderLinkage = DC->isFunctionOrMethod() && |
| 865 | DS.getStorageClassSpec() == DeclSpec::SCS_extern; |
| 866 | FilterLookupForScope(Previous, DC, S, ConsiderLinkage, |
| 867 | /*AllowInlineNamespace*/false); |
| 868 | |
| 869 | if (!Previous.empty()) { |
| 870 | auto *Old = Previous.getRepresentativeDecl(); |
| 871 | Diag(B.NameLoc, diag::err_redefinition) << B.Name; |
| 872 | Diag(Old->getLocation(), diag::note_previous_definition); |
| 873 | } else if (ShadowedDecl && !D.isRedeclaration()) { |
| 874 | CheckShadow(BD, ShadowedDecl, Previous); |
| 875 | } |
| 876 | PushOnScopeChains(BD, S, true); |
| 877 | Bindings.push_back(BD); |
| 878 | ParsingInitForAutoVars.insert(BD); |
| 879 | } |
| 880 | |
| 881 | // There are no prior lookup results for the variable itself, because it |
| 882 | // is unnamed. |
| 883 | DeclarationNameInfo NameInfo((IdentifierInfo *)nullptr, |
| 884 | Decomp.getLSquareLoc()); |
| 885 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
| 886 | ForVisibleRedeclaration); |
| 887 | |
| 888 | // Build the variable that holds the non-decomposed object. |
| 889 | bool AddToScope = true; |
| 890 | NamedDecl *New = |
| 891 | ActOnVariableDeclarator(S, D, DC, TInfo, Previous, |
| 892 | MultiTemplateParamsArg(), AddToScope, Bindings); |
| 893 | if (AddToScope) { |
| 894 | S->AddDecl(New); |
| 895 | CurContext->addHiddenDecl(New); |
| 896 | } |
| 897 | |
| 898 | if (isInOpenMPDeclareTargetContext()) |
| 899 | checkDeclIsAllowedInOpenMPTarget(nullptr, New); |
| 900 | |
| 901 | return New; |
| 902 | } |
| 903 | |
| 904 | static bool checkSimpleDecomposition( |
| 905 | Sema &S, ArrayRef<BindingDecl *> Bindings, ValueDecl *Src, |
| 906 | QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType, |
| 907 | llvm::function_ref<ExprResult(SourceLocation, Expr *, unsigned)> GetInit) { |
| 908 | if ((int64_t)Bindings.size() != NumElems) { |
| 909 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) |
| 910 | << DecompType << (unsigned)Bindings.size() |
| 911 | << (unsigned)NumElems.getLimitedValue(UINT_MAX(2147483647 *2U +1U)) |
| 912 | << toString(NumElems, 10) << (NumElems < Bindings.size()); |
| 913 | return true; |
| 914 | } |
| 915 | |
| 916 | unsigned I = 0; |
| 917 | for (auto *B : Bindings) { |
| 918 | SourceLocation Loc = B->getLocation(); |
| 919 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); |
| 920 | if (E.isInvalid()) |
| 921 | return true; |
| 922 | E = GetInit(Loc, E.get(), I++); |
| 923 | if (E.isInvalid()) |
| 924 | return true; |
| 925 | B->setBinding(ElemType, E.get()); |
| 926 | } |
| 927 | |
| 928 | return false; |
| 929 | } |
| 930 | |
| 931 | static bool checkArrayLikeDecomposition(Sema &S, |
| 932 | ArrayRef<BindingDecl *> Bindings, |
| 933 | ValueDecl *Src, QualType DecompType, |
| 934 | const llvm::APSInt &NumElems, |
| 935 | QualType ElemType) { |
| 936 | return checkSimpleDecomposition( |
| 937 | S, Bindings, Src, DecompType, NumElems, ElemType, |
| 938 | [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult { |
| 939 | ExprResult E = S.ActOnIntegerConstant(Loc, I); |
| 940 | if (E.isInvalid()) |
| 941 | return ExprError(); |
| 942 | return S.CreateBuiltinArraySubscriptExpr(Base, Loc, E.get(), Loc); |
| 943 | }); |
| 944 | } |
| 945 | |
| 946 | static bool checkArrayDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, |
| 947 | ValueDecl *Src, QualType DecompType, |
| 948 | const ConstantArrayType *CAT) { |
| 949 | return checkArrayLikeDecomposition(S, Bindings, Src, DecompType, |
| 950 | llvm::APSInt(CAT->getSize()), |
| 951 | CAT->getElementType()); |
| 952 | } |
| 953 | |
| 954 | static bool checkVectorDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, |
| 955 | ValueDecl *Src, QualType DecompType, |
| 956 | const VectorType *VT) { |
| 957 | return checkArrayLikeDecomposition( |
| 958 | S, Bindings, Src, DecompType, llvm::APSInt::get(VT->getNumElements()), |
| 959 | S.Context.getQualifiedType(VT->getElementType(), |
| 960 | DecompType.getQualifiers())); |
| 961 | } |
| 962 | |
| 963 | static bool checkComplexDecomposition(Sema &S, |
| 964 | ArrayRef<BindingDecl *> Bindings, |
| 965 | ValueDecl *Src, QualType DecompType, |
| 966 | const ComplexType *CT) { |
| 967 | return checkSimpleDecomposition( |
| 968 | S, Bindings, Src, DecompType, llvm::APSInt::get(2), |
| 969 | S.Context.getQualifiedType(CT->getElementType(), |
| 970 | DecompType.getQualifiers()), |
| 971 | [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult { |
| 972 | return S.CreateBuiltinUnaryOp(Loc, I ? UO_Imag : UO_Real, Base); |
| 973 | }); |
| 974 | } |
| 975 | |
| 976 | static std::string printTemplateArgs(const PrintingPolicy &PrintingPolicy, |
| 977 | TemplateArgumentListInfo &Args, |
| 978 | const TemplateParameterList *Params) { |
| 979 | SmallString<128> SS; |
| 980 | llvm::raw_svector_ostream OS(SS); |
| 981 | bool First = true; |
| 982 | unsigned I = 0; |
| 983 | for (auto &Arg : Args.arguments()) { |
| 984 | if (!First) |
| 985 | OS << ", "; |
| 986 | Arg.getArgument().print( |
| 987 | PrintingPolicy, OS, |
| 988 | TemplateParameterList::shouldIncludeTypeForArgument(Params, I)); |
| 989 | First = false; |
| 990 | I++; |
| 991 | } |
| 992 | return std::string(OS.str()); |
| 993 | } |
| 994 | |
| 995 | static bool lookupStdTypeTraitMember(Sema &S, LookupResult &TraitMemberLookup, |
| 996 | SourceLocation Loc, StringRef Trait, |
| 997 | TemplateArgumentListInfo &Args, |
| 998 | unsigned DiagID) { |
| 999 | auto DiagnoseMissing = [&] { |
| 1000 | if (DiagID) |
| 1001 | S.Diag(Loc, DiagID) << printTemplateArgs(S.Context.getPrintingPolicy(), |
| 1002 | Args, /*Params*/ nullptr); |
| 1003 | return true; |
| 1004 | }; |
| 1005 | |
| 1006 | // FIXME: Factor out duplication with lookupPromiseType in SemaCoroutine. |
| 1007 | NamespaceDecl *Std = S.getStdNamespace(); |
| 1008 | if (!Std) |
| 1009 | return DiagnoseMissing(); |
| 1010 | |
| 1011 | // Look up the trait itself, within namespace std. We can diagnose various |
| 1012 | // problems with this lookup even if we've been asked to not diagnose a |
| 1013 | // missing specialization, because this can only fail if the user has been |
| 1014 | // declaring their own names in namespace std or we don't support the |
| 1015 | // standard library implementation in use. |
| 1016 | LookupResult Result(S, &S.PP.getIdentifierTable().get(Trait), |
| 1017 | Loc, Sema::LookupOrdinaryName); |
| 1018 | if (!S.LookupQualifiedName(Result, Std)) |
| 1019 | return DiagnoseMissing(); |
| 1020 | if (Result.isAmbiguous()) |
| 1021 | return true; |
| 1022 | |
| 1023 | ClassTemplateDecl *TraitTD = Result.getAsSingle<ClassTemplateDecl>(); |
| 1024 | if (!TraitTD) { |
| 1025 | Result.suppressDiagnostics(); |
| 1026 | NamedDecl *Found = *Result.begin(); |
| 1027 | S.Diag(Loc, diag::err_std_type_trait_not_class_template) << Trait; |
| 1028 | S.Diag(Found->getLocation(), diag::note_declared_at); |
| 1029 | return true; |
| 1030 | } |
| 1031 | |
| 1032 | // Build the template-id. |
| 1033 | QualType TraitTy = S.CheckTemplateIdType(TemplateName(TraitTD), Loc, Args); |
| 1034 | if (TraitTy.isNull()) |
| 1035 | return true; |
| 1036 | if (!S.isCompleteType(Loc, TraitTy)) { |
| 1037 | if (DiagID) |
| 1038 | S.RequireCompleteType( |
| 1039 | Loc, TraitTy, DiagID, |
| 1040 | printTemplateArgs(S.Context.getPrintingPolicy(), Args, |
| 1041 | TraitTD->getTemplateParameters())); |
| 1042 | return true; |
| 1043 | } |
| 1044 | |
| 1045 | CXXRecordDecl *RD = TraitTy->getAsCXXRecordDecl(); |
| 1046 | assert(RD && "specialization of class template is not a class?")((void)0); |
| 1047 | |
| 1048 | // Look up the member of the trait type. |
| 1049 | S.LookupQualifiedName(TraitMemberLookup, RD); |
| 1050 | return TraitMemberLookup.isAmbiguous(); |
| 1051 | } |
| 1052 | |
| 1053 | static TemplateArgumentLoc |
| 1054 | getTrivialIntegralTemplateArgument(Sema &S, SourceLocation Loc, QualType T, |
| 1055 | uint64_t I) { |
| 1056 | TemplateArgument Arg(S.Context, S.Context.MakeIntValue(I, T), T); |
| 1057 | return S.getTrivialTemplateArgumentLoc(Arg, T, Loc); |
| 1058 | } |
| 1059 | |
| 1060 | static TemplateArgumentLoc |
| 1061 | getTrivialTypeTemplateArgument(Sema &S, SourceLocation Loc, QualType T) { |
| 1062 | return S.getTrivialTemplateArgumentLoc(TemplateArgument(T), QualType(), Loc); |
| 1063 | } |
| 1064 | |
| 1065 | namespace { enum class IsTupleLike { TupleLike, NotTupleLike, Error }; } |
| 1066 | |
| 1067 | static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T, |
| 1068 | llvm::APSInt &Size) { |
| 1069 | EnterExpressionEvaluationContext ContextRAII( |
| 1070 | S, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
| 1071 | |
| 1072 | DeclarationName Value = S.PP.getIdentifierInfo("value"); |
| 1073 | LookupResult R(S, Value, Loc, Sema::LookupOrdinaryName); |
| 1074 | |
| 1075 | // Form template argument list for tuple_size<T>. |
| 1076 | TemplateArgumentListInfo Args(Loc, Loc); |
| 1077 | Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T)); |
| 1078 | |
| 1079 | // If there's no tuple_size specialization or the lookup of 'value' is empty, |
| 1080 | // it's not tuple-like. |
| 1081 | if (lookupStdTypeTraitMember(S, R, Loc, "tuple_size", Args, /*DiagID*/ 0) || |
| 1082 | R.empty()) |
| 1083 | return IsTupleLike::NotTupleLike; |
| 1084 | |
| 1085 | // If we get this far, we've committed to the tuple interpretation, but |
| 1086 | // we can still fail if there actually isn't a usable ::value. |
| 1087 | |
| 1088 | struct ICEDiagnoser : Sema::VerifyICEDiagnoser { |
| 1089 | LookupResult &R; |
| 1090 | TemplateArgumentListInfo &Args; |
| 1091 | ICEDiagnoser(LookupResult &R, TemplateArgumentListInfo &Args) |
| 1092 | : R(R), Args(Args) {} |
| 1093 | Sema::SemaDiagnosticBuilder diagnoseNotICE(Sema &S, |
| 1094 | SourceLocation Loc) override { |
| 1095 | return S.Diag(Loc, diag::err_decomp_decl_std_tuple_size_not_constant) |
| 1096 | << printTemplateArgs(S.Context.getPrintingPolicy(), Args, |
| 1097 | /*Params*/ nullptr); |
| 1098 | } |
| 1099 | } Diagnoser(R, Args); |
| 1100 | |
| 1101 | ExprResult E = |
| 1102 | S.BuildDeclarationNameExpr(CXXScopeSpec(), R, /*NeedsADL*/false); |
| 1103 | if (E.isInvalid()) |
| 1104 | return IsTupleLike::Error; |
| 1105 | |
| 1106 | E = S.VerifyIntegerConstantExpression(E.get(), &Size, Diagnoser); |
| 1107 | if (E.isInvalid()) |
| 1108 | return IsTupleLike::Error; |
| 1109 | |
| 1110 | return IsTupleLike::TupleLike; |
| 1111 | } |
| 1112 | |
| 1113 | /// \return std::tuple_element<I, T>::type. |
| 1114 | static QualType getTupleLikeElementType(Sema &S, SourceLocation Loc, |
| 1115 | unsigned I, QualType T) { |
| 1116 | // Form template argument list for tuple_element<I, T>. |
| 1117 | TemplateArgumentListInfo Args(Loc, Loc); |
| 1118 | Args.addArgument( |
| 1119 | getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I)); |
| 1120 | Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T)); |
| 1121 | |
| 1122 | DeclarationName TypeDN = S.PP.getIdentifierInfo("type"); |
| 1123 | LookupResult R(S, TypeDN, Loc, Sema::LookupOrdinaryName); |
| 1124 | if (lookupStdTypeTraitMember( |
| 1125 | S, R, Loc, "tuple_element", Args, |
| 1126 | diag::err_decomp_decl_std_tuple_element_not_specialized)) |
| 1127 | return QualType(); |
| 1128 | |
| 1129 | auto *TD = R.getAsSingle<TypeDecl>(); |
| 1130 | if (!TD) { |
| 1131 | R.suppressDiagnostics(); |
| 1132 | S.Diag(Loc, diag::err_decomp_decl_std_tuple_element_not_specialized) |
| 1133 | << printTemplateArgs(S.Context.getPrintingPolicy(), Args, |
| 1134 | /*Params*/ nullptr); |
| 1135 | if (!R.empty()) |
| 1136 | S.Diag(R.getRepresentativeDecl()->getLocation(), diag::note_declared_at); |
| 1137 | return QualType(); |
| 1138 | } |
| 1139 | |
| 1140 | return S.Context.getTypeDeclType(TD); |
| 1141 | } |
| 1142 | |
| 1143 | namespace { |
| 1144 | struct InitializingBinding { |
| 1145 | Sema &S; |
| 1146 | InitializingBinding(Sema &S, BindingDecl *BD) : S(S) { |
| 1147 | Sema::CodeSynthesisContext Ctx; |
| 1148 | Ctx.Kind = Sema::CodeSynthesisContext::InitializingStructuredBinding; |
| 1149 | Ctx.PointOfInstantiation = BD->getLocation(); |
| 1150 | Ctx.Entity = BD; |
| 1151 | S.pushCodeSynthesisContext(Ctx); |
| 1152 | } |
| 1153 | ~InitializingBinding() { |
| 1154 | S.popCodeSynthesisContext(); |
| 1155 | } |
| 1156 | }; |
| 1157 | } |
| 1158 | |
| 1159 | static bool checkTupleLikeDecomposition(Sema &S, |
| 1160 | ArrayRef<BindingDecl *> Bindings, |
| 1161 | VarDecl *Src, QualType DecompType, |
| 1162 | const llvm::APSInt &TupleSize) { |
| 1163 | if ((int64_t)Bindings.size() != TupleSize) { |
| 1164 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) |
| 1165 | << DecompType << (unsigned)Bindings.size() |
| 1166 | << (unsigned)TupleSize.getLimitedValue(UINT_MAX(2147483647 *2U +1U)) |
| 1167 | << toString(TupleSize, 10) << (TupleSize < Bindings.size()); |
| 1168 | return true; |
| 1169 | } |
| 1170 | |
| 1171 | if (Bindings.empty()) |
| 1172 | return false; |
| 1173 | |
| 1174 | DeclarationName GetDN = S.PP.getIdentifierInfo("get"); |
| 1175 | |
| 1176 | // [dcl.decomp]p3: |
| 1177 | // The unqualified-id get is looked up in the scope of E by class member |
| 1178 | // access lookup ... |
| 1179 | LookupResult MemberGet(S, GetDN, Src->getLocation(), Sema::LookupMemberName); |
| 1180 | bool UseMemberGet = false; |
| 1181 | if (S.isCompleteType(Src->getLocation(), DecompType)) { |
| 1182 | if (auto *RD = DecompType->getAsCXXRecordDecl()) |
| 1183 | S.LookupQualifiedName(MemberGet, RD); |
| 1184 | if (MemberGet.isAmbiguous()) |
| 1185 | return true; |
| 1186 | // ... and if that finds at least one declaration that is a function |
| 1187 | // template whose first template parameter is a non-type parameter ... |
| 1188 | for (NamedDecl *D : MemberGet) { |
| 1189 | if (FunctionTemplateDecl *FTD = |
| 1190 | dyn_cast<FunctionTemplateDecl>(D->getUnderlyingDecl())) { |
| 1191 | TemplateParameterList *TPL = FTD->getTemplateParameters(); |
| 1192 | if (TPL->size() != 0 && |
| 1193 | isa<NonTypeTemplateParmDecl>(TPL->getParam(0))) { |
| 1194 | // ... the initializer is e.get<i>(). |
| 1195 | UseMemberGet = true; |
| 1196 | break; |
| 1197 | } |
| 1198 | } |
| 1199 | } |
| 1200 | } |
| 1201 | |
| 1202 | unsigned I = 0; |
| 1203 | for (auto *B : Bindings) { |
| 1204 | InitializingBinding InitContext(S, B); |
| 1205 | SourceLocation Loc = B->getLocation(); |
| 1206 | |
| 1207 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); |
| 1208 | if (E.isInvalid()) |
| 1209 | return true; |
| 1210 | |
| 1211 | // e is an lvalue if the type of the entity is an lvalue reference and |
| 1212 | // an xvalue otherwise |
| 1213 | if (!Src->getType()->isLValueReferenceType()) |
| 1214 | E = ImplicitCastExpr::Create(S.Context, E.get()->getType(), CK_NoOp, |
| 1215 | E.get(), nullptr, VK_XValue, |
| 1216 | FPOptionsOverride()); |
| 1217 | |
| 1218 | TemplateArgumentListInfo Args(Loc, Loc); |
| 1219 | Args.addArgument( |
| 1220 | getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I)); |
| 1221 | |
| 1222 | if (UseMemberGet) { |
| 1223 | // if [lookup of member get] finds at least one declaration, the |
| 1224 | // initializer is e.get<i-1>(). |
| 1225 | E = S.BuildMemberReferenceExpr(E.get(), DecompType, Loc, false, |
| 1226 | CXXScopeSpec(), SourceLocation(), nullptr, |
| 1227 | MemberGet, &Args, nullptr); |
| 1228 | if (E.isInvalid()) |
| 1229 | return true; |
| 1230 | |
| 1231 | E = S.BuildCallExpr(nullptr, E.get(), Loc, None, Loc); |
| 1232 | } else { |
| 1233 | // Otherwise, the initializer is get<i-1>(e), where get is looked up |
| 1234 | // in the associated namespaces. |
| 1235 | Expr *Get = UnresolvedLookupExpr::Create( |
| 1236 | S.Context, nullptr, NestedNameSpecifierLoc(), SourceLocation(), |
| 1237 | DeclarationNameInfo(GetDN, Loc), /*RequiresADL*/true, &Args, |
| 1238 | UnresolvedSetIterator(), UnresolvedSetIterator()); |
| 1239 | |
| 1240 | Expr *Arg = E.get(); |
| 1241 | E = S.BuildCallExpr(nullptr, Get, Loc, Arg, Loc); |
| 1242 | } |
| 1243 | if (E.isInvalid()) |
| 1244 | return true; |
| 1245 | Expr *Init = E.get(); |
| 1246 | |
| 1247 | // Given the type T designated by std::tuple_element<i - 1, E>::type, |
| 1248 | QualType T = getTupleLikeElementType(S, Loc, I, DecompType); |
| 1249 | if (T.isNull()) |
| 1250 | return true; |
| 1251 | |
| 1252 | // each vi is a variable of type "reference to T" initialized with the |
| 1253 | // initializer, where the reference is an lvalue reference if the |
| 1254 | // initializer is an lvalue and an rvalue reference otherwise |
| 1255 | QualType RefType = |
| 1256 | S.BuildReferenceType(T, E.get()->isLValue(), Loc, B->getDeclName()); |
| 1257 | if (RefType.isNull()) |
| 1258 | return true; |
| 1259 | auto *RefVD = VarDecl::Create( |
| 1260 | S.Context, Src->getDeclContext(), Loc, Loc, |
| 1261 | B->getDeclName().getAsIdentifierInfo(), RefType, |
| 1262 | S.Context.getTrivialTypeSourceInfo(T, Loc), Src->getStorageClass()); |
| 1263 | RefVD->setLexicalDeclContext(Src->getLexicalDeclContext()); |
| 1264 | RefVD->setTSCSpec(Src->getTSCSpec()); |
| 1265 | RefVD->setImplicit(); |
| 1266 | if (Src->isInlineSpecified()) |
| 1267 | RefVD->setInlineSpecified(); |
| 1268 | RefVD->getLexicalDeclContext()->addHiddenDecl(RefVD); |
| 1269 | |
| 1270 | InitializedEntity Entity = InitializedEntity::InitializeBinding(RefVD); |
| 1271 | InitializationKind Kind = InitializationKind::CreateCopy(Loc, Loc); |
| 1272 | InitializationSequence Seq(S, Entity, Kind, Init); |
| 1273 | E = Seq.Perform(S, Entity, Kind, Init); |
| 1274 | if (E.isInvalid()) |
| 1275 | return true; |
| 1276 | E = S.ActOnFinishFullExpr(E.get(), Loc, /*DiscardedValue*/ false); |
| 1277 | if (E.isInvalid()) |
| 1278 | return true; |
| 1279 | RefVD->setInit(E.get()); |
| 1280 | S.CheckCompleteVariableDeclaration(RefVD); |
| 1281 | |
| 1282 | E = S.BuildDeclarationNameExpr(CXXScopeSpec(), |
| 1283 | DeclarationNameInfo(B->getDeclName(), Loc), |
| 1284 | RefVD); |
| 1285 | if (E.isInvalid()) |
| 1286 | return true; |
| 1287 | |
| 1288 | B->setBinding(T, E.get()); |
| 1289 | I++; |
| 1290 | } |
| 1291 | |
| 1292 | return false; |
| 1293 | } |
| 1294 | |
| 1295 | /// Find the base class to decompose in a built-in decomposition of a class type. |
| 1296 | /// This base class search is, unfortunately, not quite like any other that we |
| 1297 | /// perform anywhere else in C++. |
| 1298 | static DeclAccessPair findDecomposableBaseClass(Sema &S, SourceLocation Loc, |
| 1299 | const CXXRecordDecl *RD, |
| 1300 | CXXCastPath &BasePath) { |
| 1301 | auto BaseHasFields = [](const CXXBaseSpecifier *Specifier, |
| 1302 | CXXBasePath &Path) { |
| 1303 | return Specifier->getType()->getAsCXXRecordDecl()->hasDirectFields(); |
| 1304 | }; |
| 1305 | |
| 1306 | const CXXRecordDecl *ClassWithFields = nullptr; |
| 1307 | AccessSpecifier AS = AS_public; |
| 1308 | if (RD->hasDirectFields()) |
| 1309 | // [dcl.decomp]p4: |
| 1310 | // Otherwise, all of E's non-static data members shall be public direct |
| 1311 | // members of E ... |
| 1312 | ClassWithFields = RD; |
| 1313 | else { |
| 1314 | // ... or of ... |
| 1315 | CXXBasePaths Paths; |
| 1316 | Paths.setOrigin(const_cast<CXXRecordDecl*>(RD)); |
| 1317 | if (!RD->lookupInBases(BaseHasFields, Paths)) { |
| 1318 | // If no classes have fields, just decompose RD itself. (This will work |
| 1319 | // if and only if zero bindings were provided.) |
| 1320 | return DeclAccessPair::make(const_cast<CXXRecordDecl*>(RD), AS_public); |
| 1321 | } |
| 1322 | |
| 1323 | CXXBasePath *BestPath = nullptr; |
| 1324 | for (auto &P : Paths) { |
| 1325 | if (!BestPath) |
| 1326 | BestPath = &P; |
| 1327 | else if (!S.Context.hasSameType(P.back().Base->getType(), |
| 1328 | BestPath->back().Base->getType())) { |
| 1329 | // ... the same ... |
| 1330 | S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members) |
| 1331 | << false << RD << BestPath->back().Base->getType() |
| 1332 | << P.back().Base->getType(); |
| 1333 | return DeclAccessPair(); |
| 1334 | } else if (P.Access < BestPath->Access) { |
| 1335 | BestPath = &P; |
| 1336 | } |
| 1337 | } |
| 1338 | |
| 1339 | // ... unambiguous ... |
| 1340 | QualType BaseType = BestPath->back().Base->getType(); |
| 1341 | if (Paths.isAmbiguous(S.Context.getCanonicalType(BaseType))) { |
| 1342 | S.Diag(Loc, diag::err_decomp_decl_ambiguous_base) |
| 1343 | << RD << BaseType << S.getAmbiguousPathsDisplayString(Paths); |
| 1344 | return DeclAccessPair(); |
| 1345 | } |
| 1346 | |
| 1347 | // ... [accessible, implied by other rules] base class of E. |
| 1348 | S.CheckBaseClassAccess(Loc, BaseType, S.Context.getRecordType(RD), |
| 1349 | *BestPath, diag::err_decomp_decl_inaccessible_base); |
| 1350 | AS = BestPath->Access; |
| 1351 | |
| 1352 | ClassWithFields = BaseType->getAsCXXRecordDecl(); |
| 1353 | S.BuildBasePathArray(Paths, BasePath); |
| 1354 | } |
| 1355 | |
| 1356 | // The above search did not check whether the selected class itself has base |
| 1357 | // classes with fields, so check that now. |
| 1358 | CXXBasePaths Paths; |
| 1359 | if (ClassWithFields->lookupInBases(BaseHasFields, Paths)) { |
| 1360 | S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members) |
| 1361 | << (ClassWithFields == RD) << RD << ClassWithFields |
| 1362 | << Paths.front().back().Base->getType(); |
| 1363 | return DeclAccessPair(); |
| 1364 | } |
| 1365 | |
| 1366 | return DeclAccessPair::make(const_cast<CXXRecordDecl*>(ClassWithFields), AS); |
| 1367 | } |
| 1368 | |
| 1369 | static bool checkMemberDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, |
| 1370 | ValueDecl *Src, QualType DecompType, |
| 1371 | const CXXRecordDecl *OrigRD) { |
| 1372 | if (S.RequireCompleteType(Src->getLocation(), DecompType, |
| 1373 | diag::err_incomplete_type)) |
| 1374 | return true; |
| 1375 | |
| 1376 | CXXCastPath BasePath; |
| 1377 | DeclAccessPair BasePair = |
| 1378 | findDecomposableBaseClass(S, Src->getLocation(), OrigRD, BasePath); |
| 1379 | const CXXRecordDecl *RD = cast_or_null<CXXRecordDecl>(BasePair.getDecl()); |
| 1380 | if (!RD) |
| 1381 | return true; |
| 1382 | QualType BaseType = S.Context.getQualifiedType(S.Context.getRecordType(RD), |
| 1383 | DecompType.getQualifiers()); |
| 1384 | |
| 1385 | auto DiagnoseBadNumberOfBindings = [&]() -> bool { |
| 1386 | unsigned NumFields = |
| 1387 | std::count_if(RD->field_begin(), RD->field_end(), |
| 1388 | [](FieldDecl *FD) { return !FD->isUnnamedBitfield(); }); |
| 1389 | assert(Bindings.size() != NumFields)((void)0); |
| 1390 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) |
| 1391 | << DecompType << (unsigned)Bindings.size() << NumFields << NumFields |
| 1392 | << (NumFields < Bindings.size()); |
| 1393 | return true; |
| 1394 | }; |
| 1395 | |
| 1396 | // all of E's non-static data members shall be [...] well-formed |
| 1397 | // when named as e.name in the context of the structured binding, |
| 1398 | // E shall not have an anonymous union member, ... |
| 1399 | unsigned I = 0; |
| 1400 | for (auto *FD : RD->fields()) { |
| 1401 | if (FD->isUnnamedBitfield()) |
| 1402 | continue; |
| 1403 | |
| 1404 | // All the non-static data members are required to be nameable, so they |
| 1405 | // must all have names. |
| 1406 | if (!FD->getDeclName()) { |
| 1407 | if (RD->isLambda()) { |
| 1408 | S.Diag(Src->getLocation(), diag::err_decomp_decl_lambda); |
| 1409 | S.Diag(RD->getLocation(), diag::note_lambda_decl); |
| 1410 | return true; |
| 1411 | } |
| 1412 | |
| 1413 | if (FD->isAnonymousStructOrUnion()) { |
| 1414 | S.Diag(Src->getLocation(), diag::err_decomp_decl_anon_union_member) |
| 1415 | << DecompType << FD->getType()->isUnionType(); |
| 1416 | S.Diag(FD->getLocation(), diag::note_declared_at); |
| 1417 | return true; |
| 1418 | } |
| 1419 | |
| 1420 | // FIXME: Are there any other ways we could have an anonymous member? |
| 1421 | } |
| 1422 | |
| 1423 | // We have a real field to bind. |
| 1424 | if (I >= Bindings.size()) |
| 1425 | return DiagnoseBadNumberOfBindings(); |
| 1426 | auto *B = Bindings[I++]; |
| 1427 | SourceLocation Loc = B->getLocation(); |
| 1428 | |
| 1429 | // The field must be accessible in the context of the structured binding. |
| 1430 | // We already checked that the base class is accessible. |
| 1431 | // FIXME: Add 'const' to AccessedEntity's classes so we can remove the |
| 1432 | // const_cast here. |
| 1433 | S.CheckStructuredBindingMemberAccess( |
| 1434 | Loc, const_cast<CXXRecordDecl *>(OrigRD), |
| 1435 | DeclAccessPair::make(FD, CXXRecordDecl::MergeAccess( |
| 1436 | BasePair.getAccess(), FD->getAccess()))); |
| 1437 | |
| 1438 | // Initialize the binding to Src.FD. |
| 1439 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); |
| 1440 | if (E.isInvalid()) |
| 1441 | return true; |
| 1442 | E = S.ImpCastExprToType(E.get(), BaseType, CK_UncheckedDerivedToBase, |
| 1443 | VK_LValue, &BasePath); |
| 1444 | if (E.isInvalid()) |
| 1445 | return true; |
| 1446 | E = S.BuildFieldReferenceExpr(E.get(), /*IsArrow*/ false, Loc, |
| 1447 | CXXScopeSpec(), FD, |
| 1448 | DeclAccessPair::make(FD, FD->getAccess()), |
| 1449 | DeclarationNameInfo(FD->getDeclName(), Loc)); |
| 1450 | if (E.isInvalid()) |
| 1451 | return true; |
| 1452 | |
| 1453 | // If the type of the member is T, the referenced type is cv T, where cv is |
| 1454 | // the cv-qualification of the decomposition expression. |
| 1455 | // |
| 1456 | // FIXME: We resolve a defect here: if the field is mutable, we do not add |
| 1457 | // 'const' to the type of the field. |
| 1458 | Qualifiers Q = DecompType.getQualifiers(); |
| 1459 | if (FD->isMutable()) |
| 1460 | Q.removeConst(); |
| 1461 | B->setBinding(S.BuildQualifiedType(FD->getType(), Loc, Q), E.get()); |
| 1462 | } |
| 1463 | |
| 1464 | if (I != Bindings.size()) |
| 1465 | return DiagnoseBadNumberOfBindings(); |
| 1466 | |
| 1467 | return false; |
| 1468 | } |
| 1469 | |
| 1470 | void Sema::CheckCompleteDecompositionDeclaration(DecompositionDecl *DD) { |
| 1471 | QualType DecompType = DD->getType(); |
| 1472 | |
| 1473 | // If the type of the decomposition is dependent, then so is the type of |
| 1474 | // each binding. |
| 1475 | if (DecompType->isDependentType()) { |
| 1476 | for (auto *B : DD->bindings()) |
| 1477 | B->setType(Context.DependentTy); |
| 1478 | return; |
| 1479 | } |
| 1480 | |
| 1481 | DecompType = DecompType.getNonReferenceType(); |
| 1482 | ArrayRef<BindingDecl*> Bindings = DD->bindings(); |
| 1483 | |
| 1484 | // C++1z [dcl.decomp]/2: |
| 1485 | // If E is an array type [...] |
| 1486 | // As an extension, we also support decomposition of built-in complex and |
| 1487 | // vector types. |
| 1488 | if (auto *CAT = Context.getAsConstantArrayType(DecompType)) { |
| 1489 | if (checkArrayDecomposition(*this, Bindings, DD, DecompType, CAT)) |
| 1490 | DD->setInvalidDecl(); |
| 1491 | return; |
| 1492 | } |
| 1493 | if (auto *VT = DecompType->getAs<VectorType>()) { |
| 1494 | if (checkVectorDecomposition(*this, Bindings, DD, DecompType, VT)) |
| 1495 | DD->setInvalidDecl(); |
| 1496 | return; |
| 1497 | } |
| 1498 | if (auto *CT = DecompType->getAs<ComplexType>()) { |
| 1499 | if (checkComplexDecomposition(*this, Bindings, DD, DecompType, CT)) |
| 1500 | DD->setInvalidDecl(); |
| 1501 | return; |
| 1502 | } |
| 1503 | |
| 1504 | // C++1z [dcl.decomp]/3: |
| 1505 | // if the expression std::tuple_size<E>::value is a well-formed integral |
| 1506 | // constant expression, [...] |
| 1507 | llvm::APSInt TupleSize(32); |
| 1508 | switch (isTupleLike(*this, DD->getLocation(), DecompType, TupleSize)) { |
| 1509 | case IsTupleLike::Error: |
| 1510 | DD->setInvalidDecl(); |
| 1511 | return; |
| 1512 | |
| 1513 | case IsTupleLike::TupleLike: |
| 1514 | if (checkTupleLikeDecomposition(*this, Bindings, DD, DecompType, TupleSize)) |
| 1515 | DD->setInvalidDecl(); |
| 1516 | return; |
| 1517 | |
| 1518 | case IsTupleLike::NotTupleLike: |
| 1519 | break; |
| 1520 | } |
| 1521 | |
| 1522 | // C++1z [dcl.dcl]/8: |
| 1523 | // [E shall be of array or non-union class type] |
| 1524 | CXXRecordDecl *RD = DecompType->getAsCXXRecordDecl(); |
| 1525 | if (!RD || RD->isUnion()) { |
| 1526 | Diag(DD->getLocation(), diag::err_decomp_decl_unbindable_type) |
| 1527 | << DD << !RD << DecompType; |
| 1528 | DD->setInvalidDecl(); |
| 1529 | return; |
| 1530 | } |
| 1531 | |
| 1532 | // C++1z [dcl.decomp]/4: |
| 1533 | // all of E's non-static data members shall be [...] direct members of |
| 1534 | // E or of the same unambiguous public base class of E, ... |
| 1535 | if (checkMemberDecomposition(*this, Bindings, DD, DecompType, RD)) |
| 1536 | DD->setInvalidDecl(); |
| 1537 | } |
| 1538 | |
| 1539 | /// Merge the exception specifications of two variable declarations. |
| 1540 | /// |
| 1541 | /// This is called when there's a redeclaration of a VarDecl. The function |
| 1542 | /// checks if the redeclaration might have an exception specification and |
| 1543 | /// validates compatibility and merges the specs if necessary. |
| 1544 | void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { |
| 1545 | // Shortcut if exceptions are disabled. |
| 1546 | if (!getLangOpts().CXXExceptions) |
| 1547 | return; |
| 1548 | |
| 1549 | assert(Context.hasSameType(New->getType(), Old->getType()) &&((void)0) |
| 1550 | "Should only be called if types are otherwise the same.")((void)0); |
| 1551 | |
| 1552 | QualType NewType = New->getType(); |
| 1553 | QualType OldType = Old->getType(); |
| 1554 | |
| 1555 | // We're only interested in pointers and references to functions, as well |
| 1556 | // as pointers to member functions. |
| 1557 | if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { |
| 1558 | NewType = R->getPointeeType(); |
| 1559 | OldType = OldType->castAs<ReferenceType>()->getPointeeType(); |
| 1560 | } else if (const PointerType *P = NewType->getAs<PointerType>()) { |
| 1561 | NewType = P->getPointeeType(); |
| 1562 | OldType = OldType->castAs<PointerType>()->getPointeeType(); |
| 1563 | } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { |
| 1564 | NewType = M->getPointeeType(); |
| 1565 | OldType = OldType->castAs<MemberPointerType>()->getPointeeType(); |
| 1566 | } |
| 1567 | |
| 1568 | if (!NewType->isFunctionProtoType()) |
| 1569 | return; |
| 1570 | |
| 1571 | // There's lots of special cases for functions. For function pointers, system |
| 1572 | // libraries are hopefully not as broken so that we don't need these |
| 1573 | // workarounds. |
| 1574 | if (CheckEquivalentExceptionSpec( |
| 1575 | OldType->getAs<FunctionProtoType>(), Old->getLocation(), |
| 1576 | NewType->getAs<FunctionProtoType>(), New->getLocation())) { |
| 1577 | New->setInvalidDecl(); |
| 1578 | } |
| 1579 | } |
| 1580 | |
| 1581 | /// CheckCXXDefaultArguments - Verify that the default arguments for a |
| 1582 | /// function declaration are well-formed according to C++ |
| 1583 | /// [dcl.fct.default]. |
| 1584 | void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { |
| 1585 | unsigned NumParams = FD->getNumParams(); |
| 1586 | unsigned ParamIdx = 0; |
| 1587 | |
| 1588 | // This checking doesn't make sense for explicit specializations; their |
| 1589 | // default arguments are determined by the declaration we're specializing, |
| 1590 | // not by FD. |
| 1591 | if (FD->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) |
| 1592 | return; |
| 1593 | if (auto *FTD = FD->getDescribedFunctionTemplate()) |
| 1594 | if (FTD->isMemberSpecialization()) |
| 1595 | return; |
| 1596 | |
| 1597 | // Find first parameter with a default argument |
| 1598 | for (; ParamIdx < NumParams; ++ParamIdx) { |
| 1599 | ParmVarDecl *Param = FD->getParamDecl(ParamIdx); |
| 1600 | if (Param->hasDefaultArg()) |
| 1601 | break; |
| 1602 | } |
| 1603 | |
| 1604 | // C++20 [dcl.fct.default]p4: |
| 1605 | // In a given function declaration, each parameter subsequent to a parameter |
| 1606 | // with a default argument shall have a default argument supplied in this or |
| 1607 | // a previous declaration, unless the parameter was expanded from a |
| 1608 | // parameter pack, or shall be a function parameter pack. |
| 1609 | for (; ParamIdx < NumParams; ++ParamIdx) { |
| 1610 | ParmVarDecl *Param = FD->getParamDecl(ParamIdx); |
| 1611 | if (!Param->hasDefaultArg() && !Param->isParameterPack() && |
| 1612 | !(CurrentInstantiationScope && |
| 1613 | CurrentInstantiationScope->isLocalPackExpansion(Param))) { |
| 1614 | if (Param->isInvalidDecl()) |
| 1615 | /* We already complained about this parameter. */; |
| 1616 | else if (Param->getIdentifier()) |
| 1617 | Diag(Param->getLocation(), |
| 1618 | diag::err_param_default_argument_missing_name) |
| 1619 | << Param->getIdentifier(); |
| 1620 | else |
| 1621 | Diag(Param->getLocation(), |
| 1622 | diag::err_param_default_argument_missing); |
| 1623 | } |
| 1624 | } |
| 1625 | } |
| 1626 | |
| 1627 | /// Check that the given type is a literal type. Issue a diagnostic if not, |
| 1628 | /// if Kind is Diagnose. |
| 1629 | /// \return \c true if a problem has been found (and optionally diagnosed). |
| 1630 | template <typename... Ts> |
| 1631 | static bool CheckLiteralType(Sema &SemaRef, Sema::CheckConstexprKind Kind, |
| 1632 | SourceLocation Loc, QualType T, unsigned DiagID, |
| 1633 | Ts &&...DiagArgs) { |
| 1634 | if (T->isDependentType()) |
| 1635 | return false; |
| 1636 | |
| 1637 | switch (Kind) { |
| 1638 | case Sema::CheckConstexprKind::Diagnose: |
| 1639 | return SemaRef.RequireLiteralType(Loc, T, DiagID, |
| 1640 | std::forward<Ts>(DiagArgs)...); |
| 1641 | |
| 1642 | case Sema::CheckConstexprKind::CheckValid: |
| 1643 | return !T->isLiteralType(SemaRef.Context); |
| 1644 | } |
| 1645 | |
| 1646 | llvm_unreachable("unknown CheckConstexprKind")__builtin_unreachable(); |
| 1647 | } |
| 1648 | |
| 1649 | /// Determine whether a destructor cannot be constexpr due to |
| 1650 | static bool CheckConstexprDestructorSubobjects(Sema &SemaRef, |
| 1651 | const CXXDestructorDecl *DD, |
| 1652 | Sema::CheckConstexprKind Kind) { |
| 1653 | auto Check = [&](SourceLocation Loc, QualType T, const FieldDecl *FD) { |
| 1654 | const CXXRecordDecl *RD = |
| 1655 | T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); |
| 1656 | if (!RD || RD->hasConstexprDestructor()) |
| 1657 | return true; |
| 1658 | |
| 1659 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
| 1660 | SemaRef.Diag(DD->getLocation(), diag::err_constexpr_dtor_subobject) |
| 1661 | << static_cast<int>(DD->getConstexprKind()) << !FD |
| 1662 | << (FD ? FD->getDeclName() : DeclarationName()) << T; |
| 1663 | SemaRef.Diag(Loc, diag::note_constexpr_dtor_subobject) |
| 1664 | << !FD << (FD ? FD->getDeclName() : DeclarationName()) << T; |
| 1665 | } |
| 1666 | return false; |
| 1667 | }; |
| 1668 | |
| 1669 | const CXXRecordDecl *RD = DD->getParent(); |
| 1670 | for (const CXXBaseSpecifier &B : RD->bases()) |
| 1671 | if (!Check(B.getBaseTypeLoc(), B.getType(), nullptr)) |
| 1672 | return false; |
| 1673 | for (const FieldDecl *FD : RD->fields()) |
| 1674 | if (!Check(FD->getLocation(), FD->getType(), FD)) |
| 1675 | return false; |
| 1676 | return true; |
| 1677 | } |
| 1678 | |
| 1679 | /// Check whether a function's parameter types are all literal types. If so, |
| 1680 | /// return true. If not, produce a suitable diagnostic and return false. |
| 1681 | static bool CheckConstexprParameterTypes(Sema &SemaRef, |
| 1682 | const FunctionDecl *FD, |
| 1683 | Sema::CheckConstexprKind Kind) { |
| 1684 | unsigned ArgIndex = 0; |
| 1685 | const auto *FT = FD->getType()->castAs<FunctionProtoType>(); |
| 1686 | for (FunctionProtoType::param_type_iterator i = FT->param_type_begin(), |
| 1687 | e = FT->param_type_end(); |
| 1688 | i != e; ++i, ++ArgIndex) { |
| 1689 | const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); |
| 1690 | SourceLocation ParamLoc = PD->getLocation(); |
| 1691 | if (CheckLiteralType(SemaRef, Kind, ParamLoc, *i, |
| 1692 | diag::err_constexpr_non_literal_param, ArgIndex + 1, |
| 1693 | PD->getSourceRange(), isa<CXXConstructorDecl>(FD), |
| 1694 | FD->isConsteval())) |
| 1695 | return false; |
| 1696 | } |
| 1697 | return true; |
| 1698 | } |
| 1699 | |
| 1700 | /// Check whether a function's return type is a literal type. If so, return |
| 1701 | /// true. If not, produce a suitable diagnostic and return false. |
| 1702 | static bool CheckConstexprReturnType(Sema &SemaRef, const FunctionDecl *FD, |
| 1703 | Sema::CheckConstexprKind Kind) { |
| 1704 | if (CheckLiteralType(SemaRef, Kind, FD->getLocation(), FD->getReturnType(), |
| 1705 | diag::err_constexpr_non_literal_return, |
| 1706 | FD->isConsteval())) |
| 1707 | return false; |
| 1708 | return true; |
| 1709 | } |
| 1710 | |
| 1711 | /// Get diagnostic %select index for tag kind for |
| 1712 | /// record diagnostic message. |
| 1713 | /// WARNING: Indexes apply to particular diagnostics only! |
| 1714 | /// |
| 1715 | /// \returns diagnostic %select index. |
| 1716 | static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { |
| 1717 | switch (Tag) { |
| 1718 | case TTK_Struct: return 0; |
| 1719 | case TTK_Interface: return 1; |
| 1720 | case TTK_Class: return 2; |
| 1721 | default: llvm_unreachable("Invalid tag kind for record diagnostic!")__builtin_unreachable(); |
| 1722 | } |
| 1723 | } |
| 1724 | |
| 1725 | static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl, |
| 1726 | Stmt *Body, |
| 1727 | Sema::CheckConstexprKind Kind); |
| 1728 | |
| 1729 | // Check whether a function declaration satisfies the requirements of a |
| 1730 | // constexpr function definition or a constexpr constructor definition. If so, |
| 1731 | // return true. If not, produce appropriate diagnostics (unless asked not to by |
| 1732 | // Kind) and return false. |
| 1733 | // |
| 1734 | // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. |
| 1735 | bool Sema::CheckConstexprFunctionDefinition(const FunctionDecl *NewFD, |
| 1736 | CheckConstexprKind Kind) { |
| 1737 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); |
| 1738 | if (MD && MD->isInstance()) { |
| 1739 | // C++11 [dcl.constexpr]p4: |
| 1740 | // The definition of a constexpr constructor shall satisfy the following |
| 1741 | // constraints: |
| 1742 | // - the class shall not have any virtual base classes; |
| 1743 | // |
| 1744 | // FIXME: This only applies to constructors and destructors, not arbitrary |
| 1745 | // member functions. |
| 1746 | const CXXRecordDecl *RD = MD->getParent(); |
| 1747 | if (RD->getNumVBases()) { |
| 1748 | if (Kind == CheckConstexprKind::CheckValid) |
| 1749 | return false; |
| 1750 | |
| 1751 | Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) |
| 1752 | << isa<CXXConstructorDecl>(NewFD) |
| 1753 | << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); |
| 1754 | for (const auto &I : RD->vbases()) |
| 1755 | Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here) |
| 1756 | << I.getSourceRange(); |
| 1757 | return false; |
| 1758 | } |
| 1759 | } |
| 1760 | |
| 1761 | if (!isa<CXXConstructorDecl>(NewFD)) { |
| 1762 | // C++11 [dcl.constexpr]p3: |
| 1763 | // The definition of a constexpr function shall satisfy the following |
| 1764 | // constraints: |
| 1765 | // - it shall not be virtual; (removed in C++20) |
| 1766 | const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); |
| 1767 | if (Method && Method->isVirtual()) { |
| 1768 | if (getLangOpts().CPlusPlus20) { |
| 1769 | if (Kind == CheckConstexprKind::Diagnose) |
| 1770 | Diag(Method->getLocation(), diag::warn_cxx17_compat_constexpr_virtual); |
| 1771 | } else { |
| 1772 | if (Kind == CheckConstexprKind::CheckValid) |
| 1773 | return false; |
| 1774 | |
| 1775 | Method = Method->getCanonicalDecl(); |
| 1776 | Diag(Method->getLocation(), diag::err_constexpr_virtual); |
| 1777 | |
| 1778 | // If it's not obvious why this function is virtual, find an overridden |
| 1779 | // function which uses the 'virtual' keyword. |
| 1780 | const CXXMethodDecl *WrittenVirtual = Method; |
| 1781 | while (!WrittenVirtual->isVirtualAsWritten()) |
| 1782 | WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); |
| 1783 | if (WrittenVirtual != Method) |
| 1784 | Diag(WrittenVirtual->getLocation(), |
| 1785 | diag::note_overridden_virtual_function); |
| 1786 | return false; |
| 1787 | } |
| 1788 | } |
| 1789 | |
| 1790 | // - its return type shall be a literal type; |
| 1791 | if (!CheckConstexprReturnType(*this, NewFD, Kind)) |
| 1792 | return false; |
| 1793 | } |
| 1794 | |
| 1795 | if (auto *Dtor = dyn_cast<CXXDestructorDecl>(NewFD)) { |
| 1796 | // A destructor can be constexpr only if the defaulted destructor could be; |
| 1797 | // we don't need to check the members and bases if we already know they all |
| 1798 | // have constexpr destructors. |
| 1799 | if (!Dtor->getParent()->defaultedDestructorIsConstexpr()) { |
| 1800 | if (Kind == CheckConstexprKind::CheckValid) |
| 1801 | return false; |
| 1802 | if (!CheckConstexprDestructorSubobjects(*this, Dtor, Kind)) |
| 1803 | return false; |
| 1804 | } |
| 1805 | } |
| 1806 | |
| 1807 | // - each of its parameter types shall be a literal type; |
| 1808 | if (!CheckConstexprParameterTypes(*this, NewFD, Kind)) |
| 1809 | return false; |
| 1810 | |
| 1811 | Stmt *Body = NewFD->getBody(); |
| 1812 | assert(Body &&((void)0) |
| 1813 | "CheckConstexprFunctionDefinition called on function with no body")((void)0); |
| 1814 | return CheckConstexprFunctionBody(*this, NewFD, Body, Kind); |
| 1815 | } |
| 1816 | |
| 1817 | /// Check the given declaration statement is legal within a constexpr function |
| 1818 | /// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3. |
| 1819 | /// |
| 1820 | /// \return true if the body is OK (maybe only as an extension), false if we |
| 1821 | /// have diagnosed a problem. |
| 1822 | static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, |
| 1823 | DeclStmt *DS, SourceLocation &Cxx1yLoc, |
| 1824 | Sema::CheckConstexprKind Kind) { |
| 1825 | // C++11 [dcl.constexpr]p3 and p4: |
| 1826 | // The definition of a constexpr function(p3) or constructor(p4) [...] shall |
| 1827 | // contain only |
| 1828 | for (const auto *DclIt : DS->decls()) { |
| 1829 | switch (DclIt->getKind()) { |
| 1830 | case Decl::StaticAssert: |
| 1831 | case Decl::Using: |
| 1832 | case Decl::UsingShadow: |
| 1833 | case Decl::UsingDirective: |
| 1834 | case Decl::UnresolvedUsingTypename: |
| 1835 | case Decl::UnresolvedUsingValue: |
| 1836 | case Decl::UsingEnum: |
| 1837 | // - static_assert-declarations |
| 1838 | // - using-declarations, |
| 1839 | // - using-directives, |
| 1840 | // - using-enum-declaration |
| 1841 | continue; |
| 1842 | |
| 1843 | case Decl::Typedef: |
| 1844 | case Decl::TypeAlias: { |
| 1845 | // - typedef declarations and alias-declarations that do not define |
| 1846 | // classes or enumerations, |
| 1847 | const auto *TN = cast<TypedefNameDecl>(DclIt); |
| 1848 | if (TN->getUnderlyingType()->isVariablyModifiedType()) { |
| 1849 | // Don't allow variably-modified types in constexpr functions. |
| 1850 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
| 1851 | TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); |
| 1852 | SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) |
| 1853 | << TL.getSourceRange() << TL.getType() |
| 1854 | << isa<CXXConstructorDecl>(Dcl); |
| 1855 | } |
| 1856 | return false; |
| 1857 | } |
| 1858 | continue; |
| 1859 | } |
| 1860 | |
| 1861 | case Decl::Enum: |
| 1862 | case Decl::CXXRecord: |
| 1863 | // C++1y allows types to be defined, not just declared. |
| 1864 | if (cast<TagDecl>(DclIt)->isThisDeclarationADefinition()) { |
| 1865 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
| 1866 | SemaRef.Diag(DS->getBeginLoc(), |
| 1867 | SemaRef.getLangOpts().CPlusPlus14 |
| 1868 | ? diag::warn_cxx11_compat_constexpr_type_definition |
| 1869 | : diag::ext_constexpr_type_definition) |
| 1870 | << isa<CXXConstructorDecl>(Dcl); |
| 1871 | } else if (!SemaRef.getLangOpts().CPlusPlus14) { |
| 1872 | return false; |
| 1873 | } |
| 1874 | } |
| 1875 | continue; |
| 1876 | |
| 1877 | case Decl::EnumConstant: |
| 1878 | case Decl::IndirectField: |
| 1879 | case Decl::ParmVar: |
| 1880 | // These can only appear with other declarations which are banned in |
| 1881 | // C++11 and permitted in C++1y, so ignore them. |
| 1882 | continue; |
| 1883 | |
| 1884 | case Decl::Var: |
| 1885 | case Decl::Decomposition: { |
| 1886 | // C++1y [dcl.constexpr]p3 allows anything except: |
| 1887 | // a definition of a variable of non-literal type or of static or |
| 1888 | // thread storage duration or [before C++2a] for which no |
| 1889 | // initialization is performed. |
| 1890 | const auto *VD = cast<VarDecl>(DclIt); |
| 1891 | if (VD->isThisDeclarationADefinition()) { |
| 1892 | if (VD->isStaticLocal()) { |
| 1893 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
| 1894 | SemaRef.Diag(VD->getLocation(), |
| 1895 | diag::err_constexpr_local_var_static) |
| 1896 | << isa<CXXConstructorDecl>(Dcl) |
| 1897 | << (VD->getTLSKind() == VarDecl::TLS_Dynamic); |
| 1898 | } |
| 1899 | return false; |
| 1900 | } |
| 1901 | if (CheckLiteralType(SemaRef, Kind, VD->getLocation(), VD->getType(), |
| 1902 | diag::err_constexpr_local_var_non_literal_type, |
| 1903 | isa<CXXConstructorDecl>(Dcl))) |
| 1904 | return false; |
| 1905 | if (!VD->getType()->isDependentType() && |
| 1906 | !VD->hasInit() && !VD->isCXXForRangeDecl()) { |
| 1907 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
| 1908 | SemaRef.Diag( |
| 1909 | VD->getLocation(), |
| 1910 | SemaRef.getLangOpts().CPlusPlus20 |
| 1911 | ? diag::warn_cxx17_compat_constexpr_local_var_no_init |
| 1912 | : diag::ext_constexpr_local_var_no_init) |
| 1913 | << isa<CXXConstructorDecl>(Dcl); |
| 1914 | } else if (!SemaRef.getLangOpts().CPlusPlus20) { |
| 1915 | return false; |
| 1916 | } |
| 1917 | continue; |
| 1918 | } |
| 1919 | } |
| 1920 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
| 1921 | SemaRef.Diag(VD->getLocation(), |
| 1922 | SemaRef.getLangOpts().CPlusPlus14 |
| 1923 | ? diag::warn_cxx11_compat_constexpr_local_var |
| 1924 | : diag::ext_constexpr_local_var) |
| 1925 | << isa<CXXConstructorDecl>(Dcl); |
| 1926 | } else if (!SemaRef.getLangOpts().CPlusPlus14) { |
| 1927 | return false; |
| 1928 | } |
| 1929 | continue; |
| 1930 | } |
| 1931 | |
| 1932 | case Decl::NamespaceAlias: |
| 1933 | case Decl::Function: |
| 1934 | // These are disallowed in C++11 and permitted in C++1y. Allow them |
| 1935 | // everywhere as an extension. |
| 1936 | if (!Cxx1yLoc.isValid()) |
| 1937 | Cxx1yLoc = DS->getBeginLoc(); |
| 1938 | continue; |
| 1939 | |
| 1940 | default: |
| 1941 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
| 1942 | SemaRef.Diag(DS->getBeginLoc(), diag::err_constexpr_body_invalid_stmt) |
| 1943 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); |
| 1944 | } |
| 1945 | return false; |
| 1946 | } |
| 1947 | } |
| 1948 | |
| 1949 | return true; |
| 1950 | } |
| 1951 | |
| 1952 | /// Check that the given field is initialized within a constexpr constructor. |
| 1953 | /// |
| 1954 | /// \param Dcl The constexpr constructor being checked. |
| 1955 | /// \param Field The field being checked. This may be a member of an anonymous |
| 1956 | /// struct or union nested within the class being checked. |
| 1957 | /// \param Inits All declarations, including anonymous struct/union members and |
| 1958 | /// indirect members, for which any initialization was provided. |
| 1959 | /// \param Diagnosed Whether we've emitted the error message yet. Used to attach |
| 1960 | /// multiple notes for different members to the same error. |
| 1961 | /// \param Kind Whether we're diagnosing a constructor as written or determining |
| 1962 | /// whether the formal requirements are satisfied. |
| 1963 | /// \return \c false if we're checking for validity and the constructor does |
| 1964 | /// not satisfy the requirements on a constexpr constructor. |
| 1965 | static bool CheckConstexprCtorInitializer(Sema &SemaRef, |
| 1966 | const FunctionDecl *Dcl, |
| 1967 | FieldDecl *Field, |
| 1968 | llvm::SmallSet<Decl*, 16> &Inits, |
| 1969 | bool &Diagnosed, |
| 1970 | Sema::CheckConstexprKind Kind) { |
| 1971 | // In C++20 onwards, there's nothing to check for validity. |
| 1972 | if (Kind == Sema::CheckConstexprKind::CheckValid && |
| 1973 | SemaRef.getLangOpts().CPlusPlus20) |
| 1974 | return true; |
| 1975 | |
| 1976 | if (Field->isInvalidDecl()) |
| 1977 | return true; |
| 1978 | |
| 1979 | if (Field->isUnnamedBitfield()) |
| 1980 | return true; |
| 1981 | |
| 1982 | // Anonymous unions with no variant members and empty anonymous structs do not |
| 1983 | // need to be explicitly initialized. FIXME: Anonymous structs that contain no |
| 1984 | // indirect fields don't need initializing. |
| 1985 | if (Field->isAnonymousStructOrUnion() && |
| 1986 | (Field->getType()->isUnionType() |
| 1987 | ? !Field->getType()->getAsCXXRecordDecl()->hasVariantMembers() |
| 1988 | : Field->getType()->getAsCXXRecordDecl()->isEmpty())) |
| 1989 | return true; |
| 1990 | |
| 1991 | if (!Inits.count(Field)) { |
| 1992 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
| 1993 | if (!Diagnosed) { |
| 1994 | SemaRef.Diag(Dcl->getLocation(), |
| 1995 | SemaRef.getLangOpts().CPlusPlus20 |
| 1996 | ? diag::warn_cxx17_compat_constexpr_ctor_missing_init |
| 1997 | : diag::ext_constexpr_ctor_missing_init); |
| 1998 | Diagnosed = true; |
| 1999 | } |
| 2000 | SemaRef.Diag(Field->getLocation(), |
| 2001 | diag::note_constexpr_ctor_missing_init); |
| 2002 | } else if (!SemaRef.getLangOpts().CPlusPlus20) { |
| 2003 | return false; |
| 2004 | } |
| 2005 | } else if (Field->isAnonymousStructOrUnion()) { |
| 2006 | const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); |
| 2007 | for (auto *I : RD->fields()) |
| 2008 | // If an anonymous union contains an anonymous struct of which any member |
| 2009 | // is initialized, all members must be initialized. |
| 2010 | if (!RD->isUnion() || Inits.count(I)) |
| 2011 | if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed, |
| 2012 | Kind)) |
| 2013 | return false; |
| 2014 | } |
| 2015 | return true; |
| 2016 | } |
| 2017 | |
| 2018 | /// Check the provided statement is allowed in a constexpr function |
| 2019 | /// definition. |
| 2020 | static bool |
| 2021 | CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, |
| 2022 | SmallVectorImpl<SourceLocation> &ReturnStmts, |
| 2023 | SourceLocation &Cxx1yLoc, SourceLocation &Cxx2aLoc, |
| 2024 | Sema::CheckConstexprKind Kind) { |
| 2025 | // - its function-body shall be [...] a compound-statement that contains only |
| 2026 | switch (S->getStmtClass()) { |
| 2027 | case Stmt::NullStmtClass: |
| 2028 | // - null statements, |
| 2029 | return true; |
| 2030 | |
| 2031 | case Stmt::DeclStmtClass: |
| 2032 | // - static_assert-declarations |
| 2033 | // - using-declarations, |
| 2034 | // - using-directives, |
| 2035 | // - typedef declarations and alias-declarations that do not define |
| 2036 | // classes or enumerations, |
| 2037 | if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc, Kind)) |
| 2038 | return false; |
| 2039 | return true; |
| 2040 | |
| 2041 | case Stmt::ReturnStmtClass: |
| 2042 | // - and exactly one return statement; |
| 2043 | if (isa<CXXConstructorDecl>(Dcl)) { |
| 2044 | // C++1y allows return statements in constexpr constructors. |
| 2045 | if (!Cxx1yLoc.isValid()) |
| 2046 | Cxx1yLoc = S->getBeginLoc(); |
| 2047 | return true; |
| 2048 | } |
| 2049 | |
| 2050 | ReturnStmts.push_back(S->getBeginLoc()); |
| 2051 | return true; |
| 2052 | |
| 2053 | case Stmt::CompoundStmtClass: { |
| 2054 | // C++1y allows compound-statements. |
| 2055 | if (!Cxx1yLoc.isValid()) |
| 2056 | Cxx1yLoc = S->getBeginLoc(); |
| 2057 | |
| 2058 | CompoundStmt *CompStmt = cast<CompoundStmt>(S); |
| 2059 | for (auto *BodyIt : CompStmt->body()) { |
| 2060 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, BodyIt, ReturnStmts, |
| 2061 | Cxx1yLoc, Cxx2aLoc, Kind)) |
| 2062 | return false; |
| 2063 | } |
| 2064 | return true; |
| 2065 | } |
| 2066 | |
| 2067 | case Stmt::AttributedStmtClass: |
| 2068 | if (!Cxx1yLoc.isValid()) |
| 2069 | Cxx1yLoc = S->getBeginLoc(); |
| 2070 | return true; |
| 2071 | |
| 2072 | case Stmt::IfStmtClass: { |
| 2073 | // C++1y allows if-statements. |
| 2074 | if (!Cxx1yLoc.isValid()) |
| 2075 | Cxx1yLoc = S->getBeginLoc(); |
| 2076 | |
| 2077 | IfStmt *If = cast<IfStmt>(S); |
| 2078 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts, |
| 2079 | Cxx1yLoc, Cxx2aLoc, Kind)) |
| 2080 | return false; |
| 2081 | if (If->getElse() && |
| 2082 | !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts, |
| 2083 | Cxx1yLoc, Cxx2aLoc, Kind)) |
| 2084 | return false; |
| 2085 | return true; |
| 2086 | } |
| 2087 | |
| 2088 | case Stmt::WhileStmtClass: |
| 2089 | case Stmt::DoStmtClass: |
| 2090 | case Stmt::ForStmtClass: |
| 2091 | case Stmt::CXXForRangeStmtClass: |
| 2092 | case Stmt::ContinueStmtClass: |
| 2093 | // C++1y allows all of these. We don't allow them as extensions in C++11, |
| 2094 | // because they don't make sense without variable mutation. |
| 2095 | if (!SemaRef.getLangOpts().CPlusPlus14) |
| 2096 | break; |
| 2097 | if (!Cxx1yLoc.isValid()) |
| 2098 | Cxx1yLoc = S->getBeginLoc(); |
| 2099 | for (Stmt *SubStmt : S->children()) |
| 2100 | if (SubStmt && |
| 2101 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
| 2102 | Cxx1yLoc, Cxx2aLoc, Kind)) |
| 2103 | return false; |
| 2104 | return true; |
| 2105 | |
| 2106 | case Stmt::SwitchStmtClass: |
| 2107 | case Stmt::CaseStmtClass: |
| 2108 | case Stmt::DefaultStmtClass: |
| 2109 | case Stmt::BreakStmtClass: |
| 2110 | // C++1y allows switch-statements, and since they don't need variable |
| 2111 | // mutation, we can reasonably allow them in C++11 as an extension. |
| 2112 | if (!Cxx1yLoc.isValid()) |
| 2113 | Cxx1yLoc = S->getBeginLoc(); |
| 2114 | for (Stmt *SubStmt : S->children()) |
| 2115 | if (SubStmt && |
| 2116 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
| 2117 | Cxx1yLoc, Cxx2aLoc, Kind)) |
| 2118 | return false; |
| 2119 | return true; |
| 2120 | |
| 2121 | case Stmt::GCCAsmStmtClass: |
| 2122 | case Stmt::MSAsmStmtClass: |
| 2123 | // C++2a allows inline assembly statements. |
| 2124 | case Stmt::CXXTryStmtClass: |
| 2125 | if (Cxx2aLoc.isInvalid()) |
| 2126 | Cxx2aLoc = S->getBeginLoc(); |
| 2127 | for (Stmt *SubStmt : S->children()) { |
| 2128 | if (SubStmt && |
| 2129 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
| 2130 | Cxx1yLoc, Cxx2aLoc, Kind)) |
| 2131 | return false; |
| 2132 | } |
| 2133 | return true; |
| 2134 | |
| 2135 | case Stmt::CXXCatchStmtClass: |
| 2136 | // Do not bother checking the language mode (already covered by the |
| 2137 | // try block check). |
| 2138 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, |
| 2139 | cast<CXXCatchStmt>(S)->getHandlerBlock(), |
| 2140 | ReturnStmts, Cxx1yLoc, Cxx2aLoc, Kind)) |
| 2141 | return false; |
| 2142 | return true; |
| 2143 | |
| 2144 | default: |
| 2145 | if (!isa<Expr>(S)) |
| 2146 | break; |
| 2147 | |
| 2148 | // C++1y allows expression-statements. |
| 2149 | if (!Cxx1yLoc.isValid()) |
| 2150 | Cxx1yLoc = S->getBeginLoc(); |
| 2151 | return true; |
| 2152 | } |
| 2153 | |
| 2154 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
| 2155 | SemaRef.Diag(S->getBeginLoc(), diag::err_constexpr_body_invalid_stmt) |
| 2156 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); |
| 2157 | } |
| 2158 | return false; |
| 2159 | } |
| 2160 | |
| 2161 | /// Check the body for the given constexpr function declaration only contains |
| 2162 | /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. |
| 2163 | /// |
| 2164 | /// \return true if the body is OK, false if we have found or diagnosed a |
| 2165 | /// problem. |
| 2166 | static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl, |
| 2167 | Stmt *Body, |
| 2168 | Sema::CheckConstexprKind Kind) { |
| 2169 | SmallVector<SourceLocation, 4> ReturnStmts; |
| 2170 | |
| 2171 | if (isa<CXXTryStmt>(Body)) { |
| 2172 | // C++11 [dcl.constexpr]p3: |
| 2173 | // The definition of a constexpr function shall satisfy the following |
| 2174 | // constraints: [...] |
| 2175 | // - its function-body shall be = delete, = default, or a |
| 2176 | // compound-statement |
| 2177 | // |
| 2178 | // C++11 [dcl.constexpr]p4: |
| 2179 | // In the definition of a constexpr constructor, [...] |
| 2180 | // - its function-body shall not be a function-try-block; |
| 2181 | // |
| 2182 | // This restriction is lifted in C++2a, as long as inner statements also |
| 2183 | // apply the general constexpr rules. |
| 2184 | switch (Kind) { |
| 2185 | case Sema::CheckConstexprKind::CheckValid: |
| 2186 | if (!SemaRef.getLangOpts().CPlusPlus20) |
| 2187 | return false; |
| 2188 | break; |
| 2189 | |
| 2190 | case Sema::CheckConstexprKind::Diagnose: |
| 2191 | SemaRef.Diag(Body->getBeginLoc(), |
| 2192 | !SemaRef.getLangOpts().CPlusPlus20 |
| 2193 | ? diag::ext_constexpr_function_try_block_cxx20 |
| 2194 | : diag::warn_cxx17_compat_constexpr_function_try_block) |
| 2195 | << isa<CXXConstructorDecl>(Dcl); |
| 2196 | break; |
| 2197 | } |
| 2198 | } |
| 2199 | |
| 2200 | // - its function-body shall be [...] a compound-statement that contains only |
| 2201 | // [... list of cases ...] |
| 2202 | // |
| 2203 | // Note that walking the children here is enough to properly check for |
| 2204 | // CompoundStmt and CXXTryStmt body. |
| 2205 | SourceLocation Cxx1yLoc, Cxx2aLoc; |
| 2206 | for (Stmt *SubStmt : Body->children()) { |
| 2207 | if (SubStmt && |
| 2208 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
| 2209 | Cxx1yLoc, Cxx2aLoc, Kind)) |
| 2210 | return false; |
| 2211 | } |
| 2212 | |
| 2213 | if (Kind == Sema::CheckConstexprKind::CheckValid) { |
| 2214 | // If this is only valid as an extension, report that we don't satisfy the |
| 2215 | // constraints of the current language. |
| 2216 | if ((Cxx2aLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus20) || |
| 2217 | (Cxx1yLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus17)) |
| 2218 | return false; |
| 2219 | } else if (Cxx2aLoc.isValid()) { |
| 2220 | SemaRef.Diag(Cxx2aLoc, |
| 2221 | SemaRef.getLangOpts().CPlusPlus20 |
| 2222 | ? diag::warn_cxx17_compat_constexpr_body_invalid_stmt |
| 2223 | : diag::ext_constexpr_body_invalid_stmt_cxx20) |
| 2224 | << isa<CXXConstructorDecl>(Dcl); |
| 2225 | } else if (Cxx1yLoc.isValid()) { |
| 2226 | SemaRef.Diag(Cxx1yLoc, |
| 2227 | SemaRef.getLangOpts().CPlusPlus14 |
| 2228 | ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt |
| 2229 | : diag::ext_constexpr_body_invalid_stmt) |
| 2230 | << isa<CXXConstructorDecl>(Dcl); |
| 2231 | } |
| 2232 | |
| 2233 | if (const CXXConstructorDecl *Constructor |
| 2234 | = dyn_cast<CXXConstructorDecl>(Dcl)) { |
| 2235 | const CXXRecordDecl *RD = Constructor->getParent(); |
| 2236 | // DR1359: |
| 2237 | // - every non-variant non-static data member and base class sub-object |
| 2238 | // shall be initialized; |
| 2239 | // DR1460: |
| 2240 | // - if the class is a union having variant members, exactly one of them |
| 2241 | // shall be initialized; |
| 2242 | if (RD->isUnion()) { |
| 2243 | if (Constructor->getNumCtorInitializers() == 0 && |
| 2244 | RD->hasVariantMembers()) { |
| 2245 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
| 2246 | SemaRef.Diag( |
| 2247 | Dcl->getLocation(), |
| 2248 | SemaRef.getLangOpts().CPlusPlus20 |
| 2249 | ? diag::warn_cxx17_compat_constexpr_union_ctor_no_init |
| 2250 | : diag::ext_constexpr_union_ctor_no_init); |
| 2251 | } else if (!SemaRef.getLangOpts().CPlusPlus20) { |
| 2252 | return false; |
| 2253 | } |
| 2254 | } |
| 2255 | } else if (!Constructor->isDependentContext() && |
| 2256 | !Constructor->isDelegatingConstructor()) { |
| 2257 | assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases")((void)0); |
| 2258 | |
| 2259 | // Skip detailed checking if we have enough initializers, and we would |
| 2260 | // allow at most one initializer per member. |
| 2261 | bool AnyAnonStructUnionMembers = false; |
| 2262 | unsigned Fields = 0; |
| 2263 | for (CXXRecordDecl::field_iterator I = RD->field_begin(), |
| 2264 | E = RD->field_end(); I != E; ++I, ++Fields) { |
| 2265 | if (I->isAnonymousStructOrUnion()) { |
| 2266 | AnyAnonStructUnionMembers = true; |
| 2267 | break; |
| 2268 | } |
| 2269 | } |
| 2270 | // DR1460: |
| 2271 | // - if the class is a union-like class, but is not a union, for each of |
| 2272 | // its anonymous union members having variant members, exactly one of |
| 2273 | // them shall be initialized; |
| 2274 | if (AnyAnonStructUnionMembers || |
| 2275 | Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { |
| 2276 | // Check initialization of non-static data members. Base classes are |
| 2277 | // always initialized so do not need to be checked. Dependent bases |
| 2278 | // might not have initializers in the member initializer list. |
| 2279 | llvm::SmallSet<Decl*, 16> Inits; |
| 2280 | for (const auto *I: Constructor->inits()) { |
| 2281 | if (FieldDecl *FD = I->getMember()) |
| 2282 | Inits.insert(FD); |
| 2283 | else if (IndirectFieldDecl *ID = I->getIndirectMember()) |
| 2284 | Inits.insert(ID->chain_begin(), ID->chain_end()); |
| 2285 | } |
| 2286 | |
| 2287 | bool Diagnosed = false; |
| 2288 | for (auto *I : RD->fields()) |
| 2289 | if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed, |
| 2290 | Kind)) |
| 2291 | return false; |
| 2292 | } |
| 2293 | } |
| 2294 | } else { |
| 2295 | if (ReturnStmts.empty()) { |
| 2296 | // C++1y doesn't require constexpr functions to contain a 'return' |
| 2297 | // statement. We still do, unless the return type might be void, because |
| 2298 | // otherwise if there's no return statement, the function cannot |
| 2299 | // be used in a core constant expression. |
| 2300 | bool OK = SemaRef.getLangOpts().CPlusPlus14 && |
| 2301 | (Dcl->getReturnType()->isVoidType() || |
| 2302 | Dcl->getReturnType()->isDependentType()); |
| 2303 | switch (Kind) { |
| 2304 | case Sema::CheckConstexprKind::Diagnose: |
| 2305 | SemaRef.Diag(Dcl->getLocation(), |
| 2306 | OK ? diag::warn_cxx11_compat_constexpr_body_no_return |
| 2307 | : diag::err_constexpr_body_no_return) |
| 2308 | << Dcl->isConsteval(); |
| 2309 | if (!OK) |
| 2310 | return false; |
| 2311 | break; |
| 2312 | |
| 2313 | case Sema::CheckConstexprKind::CheckValid: |
| 2314 | // The formal requirements don't include this rule in C++14, even |
| 2315 | // though the "must be able to produce a constant expression" rules |
| 2316 | // still imply it in some cases. |
| 2317 | if (!SemaRef.getLangOpts().CPlusPlus14) |
| 2318 | return false; |
| 2319 | break; |
| 2320 | } |
| 2321 | } else if (ReturnStmts.size() > 1) { |
| 2322 | switch (Kind) { |
| 2323 | case Sema::CheckConstexprKind::Diagnose: |
| 2324 | SemaRef.Diag( |
| 2325 | ReturnStmts.back(), |
| 2326 | SemaRef.getLangOpts().CPlusPlus14 |
| 2327 | ? diag::warn_cxx11_compat_constexpr_body_multiple_return |
| 2328 | : diag::ext_constexpr_body_multiple_return); |
| 2329 | for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) |
| 2330 | SemaRef.Diag(ReturnStmts[I], |
| 2331 | diag::note_constexpr_body_previous_return); |
| 2332 | break; |
| 2333 | |
| 2334 | case Sema::CheckConstexprKind::CheckValid: |
| 2335 | if (!SemaRef.getLangOpts().CPlusPlus14) |
| 2336 | return false; |
| 2337 | break; |
| 2338 | } |
| 2339 | } |
| 2340 | } |
| 2341 | |
| 2342 | // C++11 [dcl.constexpr]p5: |
| 2343 | // if no function argument values exist such that the function invocation |
| 2344 | // substitution would produce a constant expression, the program is |
| 2345 | // ill-formed; no diagnostic required. |
| 2346 | // C++11 [dcl.constexpr]p3: |
| 2347 | // - every constructor call and implicit conversion used in initializing the |
| 2348 | // return value shall be one of those allowed in a constant expression. |
| 2349 | // C++11 [dcl.constexpr]p4: |
| 2350 | // - every constructor involved in initializing non-static data members and |
| 2351 | // base class sub-objects shall be a constexpr constructor. |
| 2352 | // |
| 2353 | // Note that this rule is distinct from the "requirements for a constexpr |
| 2354 | // function", so is not checked in CheckValid mode. |
| 2355 | SmallVector<PartialDiagnosticAt, 8> Diags; |
| 2356 | if (Kind == Sema::CheckConstexprKind::Diagnose && |
| 2357 | !Expr::isPotentialConstantExpr(Dcl, Diags)) { |
| 2358 | SemaRef.Diag(Dcl->getLocation(), |
| 2359 | diag::ext_constexpr_function_never_constant_expr) |
| 2360 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); |
| 2361 | for (size_t I = 0, N = Diags.size(); I != N; ++I) |
| 2362 | SemaRef.Diag(Diags[I].first, Diags[I].second); |
| 2363 | // Don't return false here: we allow this for compatibility in |
| 2364 | // system headers. |
| 2365 | } |
| 2366 | |
| 2367 | return true; |
| 2368 | } |
| 2369 | |
| 2370 | /// Get the class that is directly named by the current context. This is the |
| 2371 | /// class for which an unqualified-id in this scope could name a constructor |
| 2372 | /// or destructor. |
| 2373 | /// |
| 2374 | /// If the scope specifier denotes a class, this will be that class. |
| 2375 | /// If the scope specifier is empty, this will be the class whose |
| 2376 | /// member-specification we are currently within. Otherwise, there |
| 2377 | /// is no such class. |
| 2378 | CXXRecordDecl *Sema::getCurrentClass(Scope *, const CXXScopeSpec *SS) { |
| 2379 | assert(getLangOpts().CPlusPlus && "No class names in C!")((void)0); |
| 2380 | |
| 2381 | if (SS && SS->isInvalid()) |
| 2382 | return nullptr; |
| 2383 | |
| 2384 | if (SS && SS->isNotEmpty()) { |
| 2385 | DeclContext *DC = computeDeclContext(*SS, true); |
| 2386 | return dyn_cast_or_null<CXXRecordDecl>(DC); |
| 2387 | } |
| 2388 | |
| 2389 | return dyn_cast_or_null<CXXRecordDecl>(CurContext); |
| 2390 | } |
| 2391 | |
| 2392 | /// isCurrentClassName - Determine whether the identifier II is the |
| 2393 | /// name of the class type currently being defined. In the case of |
| 2394 | /// nested classes, this will only return true if II is the name of |
| 2395 | /// the innermost class. |
| 2396 | bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *S, |
| 2397 | const CXXScopeSpec *SS) { |
| 2398 | CXXRecordDecl *CurDecl = getCurrentClass(S, SS); |
| 2399 | return CurDecl && &II == CurDecl->getIdentifier(); |
| 2400 | } |
| 2401 | |
| 2402 | /// Determine whether the identifier II is a typo for the name of |
| 2403 | /// the class type currently being defined. If so, update it to the identifier |
| 2404 | /// that should have been used. |
| 2405 | bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) { |
| 2406 | assert(getLangOpts().CPlusPlus && "No class names in C!")((void)0); |
| 2407 | |
| 2408 | if (!getLangOpts().SpellChecking) |
| 2409 | return false; |
| 2410 | |
| 2411 | CXXRecordDecl *CurDecl; |
| 2412 | if (SS && SS->isSet() && !SS->isInvalid()) { |
| 2413 | DeclContext *DC = computeDeclContext(*SS, true); |
| 2414 | CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); |
| 2415 | } else |
| 2416 | CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); |
| 2417 | |
| 2418 | if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() && |
| 2419 | 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName()) |
| 2420 | < II->getLength()) { |
| 2421 | II = CurDecl->getIdentifier(); |
| 2422 | return true; |
| 2423 | } |
| 2424 | |
| 2425 | return false; |
| 2426 | } |
| 2427 | |
| 2428 | /// Determine whether the given class is a base class of the given |
| 2429 | /// class, including looking at dependent bases. |
| 2430 | static bool findCircularInheritance(const CXXRecordDecl *Class, |
| 2431 | const CXXRecordDecl *Current) { |
| 2432 | SmallVector<const CXXRecordDecl*, 8> Queue; |
| 2433 | |
| 2434 | Class = Class->getCanonicalDecl(); |
| 2435 | while (true) { |
| 2436 | for (const auto &I : Current->bases()) { |
| 2437 | CXXRecordDecl *Base = I.getType()->getAsCXXRecordDecl(); |
| 2438 | if (!Base) |
| 2439 | continue; |
| 2440 | |
| 2441 | Base = Base->getDefinition(); |
| 2442 | if (!Base) |
| 2443 | continue; |
| 2444 | |
| 2445 | if (Base->getCanonicalDecl() == Class) |
| 2446 | return true; |
| 2447 | |
| 2448 | Queue.push_back(Base); |
| 2449 | } |
| 2450 | |
| 2451 | if (Queue.empty()) |
| 2452 | return false; |
| 2453 | |
| 2454 | Current = Queue.pop_back_val(); |
| 2455 | } |
| 2456 | |
| 2457 | return false; |
| 2458 | } |
| 2459 | |
| 2460 | /// Check the validity of a C++ base class specifier. |
| 2461 | /// |
| 2462 | /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics |
| 2463 | /// and returns NULL otherwise. |
| 2464 | CXXBaseSpecifier * |
| 2465 | Sema::CheckBaseSpecifier(CXXRecordDecl *Class, |
| 2466 | SourceRange SpecifierRange, |
| 2467 | bool Virtual, AccessSpecifier Access, |
| 2468 | TypeSourceInfo *TInfo, |
| 2469 | SourceLocation EllipsisLoc) { |
| 2470 | QualType BaseType = TInfo->getType(); |
| 2471 | if (BaseType->containsErrors()) { |
| 2472 | // Already emitted a diagnostic when parsing the error type. |
| 2473 | return nullptr; |
| 2474 | } |
| 2475 | // C++ [class.union]p1: |
| 2476 | // A union shall not have base classes. |
| 2477 | if (Class->isUnion()) { |
| 2478 | Diag(Class->getLocation(), diag::err_base_clause_on_union) |
| 2479 | << SpecifierRange; |
| 2480 | return nullptr; |
| 2481 | } |
| 2482 | |
| 2483 | if (EllipsisLoc.isValid() && |
| 2484 | !TInfo->getType()->containsUnexpandedParameterPack()) { |
| 2485 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) |
| 2486 | << TInfo->getTypeLoc().getSourceRange(); |
| 2487 | EllipsisLoc = SourceLocation(); |
| 2488 | } |
| 2489 | |
| 2490 | SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); |
| 2491 | |
| 2492 | if (BaseType->isDependentType()) { |
| 2493 | // Make sure that we don't have circular inheritance among our dependent |
| 2494 | // bases. For non-dependent bases, the check for completeness below handles |
| 2495 | // this. |
| 2496 | if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { |
| 2497 | if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || |
| 2498 | ((BaseDecl = BaseDecl->getDefinition()) && |
| 2499 | findCircularInheritance(Class, BaseDecl))) { |
| 2500 | Diag(BaseLoc, diag::err_circular_inheritance) |
| 2501 | << BaseType << Context.getTypeDeclType(Class); |
| 2502 | |
| 2503 | if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) |
| 2504 | Diag(BaseDecl->getLocation(), diag::note_previous_decl) |
| 2505 | << BaseType; |
| 2506 | |
| 2507 | return nullptr; |
| 2508 | } |
| 2509 | } |
| 2510 | |
| 2511 | // Make sure that we don't make an ill-formed AST where the type of the |
| 2512 | // Class is non-dependent and its attached base class specifier is an |
| 2513 | // dependent type, which violates invariants in many clang code paths (e.g. |
| 2514 | // constexpr evaluator). If this case happens (in errory-recovery mode), we |
| 2515 | // explicitly mark the Class decl invalid. The diagnostic was already |
| 2516 | // emitted. |
| 2517 | if (!Class->getTypeForDecl()->isDependentType()) |
| 2518 | Class->setInvalidDecl(); |
| 2519 | return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, |
| 2520 | Class->getTagKind() == TTK_Class, |
| 2521 | Access, TInfo, EllipsisLoc); |
| 2522 | } |
| 2523 | |
| 2524 | // Base specifiers must be record types. |
| 2525 | if (!BaseType->isRecordType()) { |
| 2526 | Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; |
| 2527 | return nullptr; |
| 2528 | } |
| 2529 | |
| 2530 | // C++ [class.union]p1: |
| 2531 | // A union shall not be used as a base class. |
| 2532 | if (BaseType->isUnionType()) { |
| 2533 | Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; |
| 2534 | return nullptr; |
| 2535 | } |
| 2536 | |
| 2537 | // For the MS ABI, propagate DLL attributes to base class templates. |
| 2538 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
| 2539 | if (Attr *ClassAttr = getDLLAttr(Class)) { |
| 2540 | if (auto *BaseTemplate = dyn_cast_or_null<ClassTemplateSpecializationDecl>( |
| 2541 | BaseType->getAsCXXRecordDecl())) { |
| 2542 | propagateDLLAttrToBaseClassTemplate(Class, ClassAttr, BaseTemplate, |
| 2543 | BaseLoc); |
| 2544 | } |
| 2545 | } |
| 2546 | } |
| 2547 | |
| 2548 | // C++ [class.derived]p2: |
| 2549 | // The class-name in a base-specifier shall not be an incompletely |
| 2550 | // defined class. |
| 2551 | if (RequireCompleteType(BaseLoc, BaseType, |
| 2552 | diag::err_incomplete_base_class, SpecifierRange)) { |
| 2553 | Class->setInvalidDecl(); |
| 2554 | return nullptr; |
| 2555 | } |
| 2556 | |
| 2557 | // If the base class is polymorphic or isn't empty, the new one is/isn't, too. |
| 2558 | RecordDecl *BaseDecl = BaseType->castAs<RecordType>()->getDecl(); |
| 2559 | assert(BaseDecl && "Record type has no declaration")((void)0); |
| 2560 | BaseDecl = BaseDecl->getDefinition(); |
| 2561 | assert(BaseDecl && "Base type is not incomplete, but has no definition")((void)0); |
| 2562 | CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); |
| 2563 | assert(CXXBaseDecl && "Base type is not a C++ type")((void)0); |
| 2564 | |
| 2565 | // Microsoft docs say: |
| 2566 | // "If a base-class has a code_seg attribute, derived classes must have the |
| 2567 | // same attribute." |
| 2568 | const auto *BaseCSA = CXXBaseDecl->getAttr<CodeSegAttr>(); |
| 2569 | const auto *DerivedCSA = Class->getAttr<CodeSegAttr>(); |
| 2570 | if ((DerivedCSA || BaseCSA) && |
| 2571 | (!BaseCSA || !DerivedCSA || BaseCSA->getName() != DerivedCSA->getName())) { |
| 2572 | Diag(Class->getLocation(), diag::err_mismatched_code_seg_base); |
| 2573 | Diag(CXXBaseDecl->getLocation(), diag::note_base_class_specified_here) |
| 2574 | << CXXBaseDecl; |
| 2575 | return nullptr; |
| 2576 | } |
| 2577 | |
| 2578 | // A class which contains a flexible array member is not suitable for use as a |
| 2579 | // base class: |
| 2580 | // - If the layout determines that a base comes before another base, |
| 2581 | // the flexible array member would index into the subsequent base. |
| 2582 | // - If the layout determines that base comes before the derived class, |
| 2583 | // the flexible array member would index into the derived class. |
| 2584 | if (CXXBaseDecl->hasFlexibleArrayMember()) { |
| 2585 | Diag(BaseLoc, diag::err_base_class_has_flexible_array_member) |
| 2586 | << CXXBaseDecl->getDeclName(); |
| 2587 | return nullptr; |
| 2588 | } |
| 2589 | |
| 2590 | // C++ [class]p3: |
| 2591 | // If a class is marked final and it appears as a base-type-specifier in |
| 2592 | // base-clause, the program is ill-formed. |
| 2593 | if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) { |
| 2594 | Diag(BaseLoc, diag::err_class_marked_final_used_as_base) |
| 2595 | << CXXBaseDecl->getDeclName() |
| 2596 | << FA->isSpelledAsSealed(); |
| 2597 | Diag(CXXBaseDecl->getLocation(), diag::note_entity_declared_at) |
| 2598 | << CXXBaseDecl->getDeclName() << FA->getRange(); |
| 2599 | return nullptr; |
| 2600 | } |
| 2601 | |
| 2602 | if (BaseDecl->isInvalidDecl()) |
| 2603 | Class->setInvalidDecl(); |
| 2604 | |
| 2605 | // Create the base specifier. |
| 2606 | return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, |
| 2607 | Class->getTagKind() == TTK_Class, |
| 2608 | Access, TInfo, EllipsisLoc); |
| 2609 | } |
| 2610 | |
| 2611 | /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is |
| 2612 | /// one entry in the base class list of a class specifier, for |
| 2613 | /// example: |
| 2614 | /// class foo : public bar, virtual private baz { |
| 2615 | /// 'public bar' and 'virtual private baz' are each base-specifiers. |
| 2616 | BaseResult |
| 2617 | Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, |
| 2618 | ParsedAttributes &Attributes, |
| 2619 | bool Virtual, AccessSpecifier Access, |
| 2620 | ParsedType basetype, SourceLocation BaseLoc, |
| 2621 | SourceLocation EllipsisLoc) { |
| 2622 | if (!classdecl) |
| 2623 | return true; |
| 2624 | |
| 2625 | AdjustDeclIfTemplate(classdecl); |
| 2626 | CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); |
| 2627 | if (!Class) |
| 2628 | return true; |
| 2629 | |
| 2630 | // We haven't yet attached the base specifiers. |
| 2631 | Class->setIsParsingBaseSpecifiers(); |
| 2632 | |
| 2633 | // We do not support any C++11 attributes on base-specifiers yet. |
| 2634 | // Diagnose any attributes we see. |
| 2635 | for (const ParsedAttr &AL : Attributes) { |
| 2636 | if (AL.isInvalid() || AL.getKind() == ParsedAttr::IgnoredAttribute) |
| 2637 | continue; |
| 2638 | Diag(AL.getLoc(), AL.getKind() == ParsedAttr::UnknownAttribute |
| 2639 | ? (unsigned)diag::warn_unknown_attribute_ignored |
| 2640 | : (unsigned)diag::err_base_specifier_attribute) |
| 2641 | << AL << AL.getRange(); |
| 2642 | } |
| 2643 | |
| 2644 | TypeSourceInfo *TInfo = nullptr; |
| 2645 | GetTypeFromParser(basetype, &TInfo); |
| 2646 | |
| 2647 | if (EllipsisLoc.isInvalid() && |
| 2648 | DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, |
| 2649 | UPPC_BaseType)) |
| 2650 | return true; |
| 2651 | |
| 2652 | if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, |
| 2653 | Virtual, Access, TInfo, |
| 2654 | EllipsisLoc)) |
| 2655 | return BaseSpec; |
| 2656 | else |
| 2657 | Class->setInvalidDecl(); |
| 2658 | |
| 2659 | return true; |
| 2660 | } |
| 2661 | |
| 2662 | /// Use small set to collect indirect bases. As this is only used |
| 2663 | /// locally, there's no need to abstract the small size parameter. |
| 2664 | typedef llvm::SmallPtrSet<QualType, 4> IndirectBaseSet; |
| 2665 | |
| 2666 | /// Recursively add the bases of Type. Don't add Type itself. |
| 2667 | static void |
| 2668 | NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set, |
| 2669 | const QualType &Type) |
| 2670 | { |
| 2671 | // Even though the incoming type is a base, it might not be |
| 2672 | // a class -- it could be a template parm, for instance. |
| 2673 | if (auto Rec = Type->getAs<RecordType>()) { |
| 2674 | auto Decl = Rec->getAsCXXRecordDecl(); |
| 2675 | |
| 2676 | // Iterate over its bases. |
| 2677 | for (const auto &BaseSpec : Decl->bases()) { |
| 2678 | QualType Base = Context.getCanonicalType(BaseSpec.getType()) |
| 2679 | .getUnqualifiedType(); |
| 2680 | if (Set.insert(Base).second) |
| 2681 | // If we've not already seen it, recurse. |
| 2682 | NoteIndirectBases(Context, Set, Base); |
| 2683 | } |
| 2684 | } |
| 2685 | } |
| 2686 | |
| 2687 | /// Performs the actual work of attaching the given base class |
| 2688 | /// specifiers to a C++ class. |
| 2689 | bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, |
| 2690 | MutableArrayRef<CXXBaseSpecifier *> Bases) { |
| 2691 | if (Bases.empty()) |
| 2692 | return false; |
| 2693 | |
| 2694 | // Used to keep track of which base types we have already seen, so |
| 2695 | // that we can properly diagnose redundant direct base types. Note |
| 2696 | // that the key is always the unqualified canonical type of the base |
| 2697 | // class. |
| 2698 | std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; |
| 2699 | |
| 2700 | // Used to track indirect bases so we can see if a direct base is |
| 2701 | // ambiguous. |
| 2702 | IndirectBaseSet IndirectBaseTypes; |
| 2703 | |
| 2704 | // Copy non-redundant base specifiers into permanent storage. |
| 2705 | unsigned NumGoodBases = 0; |
| 2706 | bool Invalid = false; |
| 2707 | for (unsigned idx = 0; idx < Bases.size(); ++idx) { |
| 2708 | QualType NewBaseType |
| 2709 | = Context.getCanonicalType(Bases[idx]->getType()); |
| 2710 | NewBaseType = NewBaseType.getLocalUnqualifiedType(); |
| 2711 | |
| 2712 | CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; |
| 2713 | if (KnownBase) { |
| 2714 | // C++ [class.mi]p3: |
| 2715 | // A class shall not be specified as a direct base class of a |
| 2716 | // derived class more than once. |
| 2717 | Diag(Bases[idx]->getBeginLoc(), diag::err_duplicate_base_class) |
| 2718 | << KnownBase->getType() << Bases[idx]->getSourceRange(); |
| 2719 | |
| 2720 | // Delete the duplicate base class specifier; we're going to |
| 2721 | // overwrite its pointer later. |
| 2722 | Context.Deallocate(Bases[idx]); |
| 2723 | |
| 2724 | Invalid = true; |
| 2725 | } else { |
| 2726 | // Okay, add this new base class. |
| 2727 | KnownBase = Bases[idx]; |
| 2728 | Bases[NumGoodBases++] = Bases[idx]; |
| 2729 | |
| 2730 | // Note this base's direct & indirect bases, if there could be ambiguity. |
| 2731 | if (Bases.size() > 1) |
| 2732 | NoteIndirectBases(Context, IndirectBaseTypes, NewBaseType); |
| 2733 | |
| 2734 | if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { |
| 2735 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); |
| 2736 | if (Class->isInterface() && |
| 2737 | (!RD->isInterfaceLike() || |
| 2738 | KnownBase->getAccessSpecifier() != AS_public)) { |
| 2739 | // The Microsoft extension __interface does not permit bases that |
| 2740 | // are not themselves public interfaces. |
| 2741 | Diag(KnownBase->getBeginLoc(), diag::err_invalid_base_in_interface) |
| 2742 | << getRecordDiagFromTagKind(RD->getTagKind()) << RD |
| 2743 | << RD->getSourceRange(); |
| 2744 | Invalid = true; |
| 2745 | } |
| 2746 | if (RD->hasAttr<WeakAttr>()) |
| 2747 | Class->addAttr(WeakAttr::CreateImplicit(Context)); |
| 2748 | } |
| 2749 | } |
| 2750 | } |
| 2751 | |
| 2752 | // Attach the remaining base class specifiers to the derived class. |
| 2753 | Class->setBases(Bases.data(), NumGoodBases); |
| 2754 | |
| 2755 | // Check that the only base classes that are duplicate are virtual. |
| 2756 | for (unsigned idx = 0; idx < NumGoodBases; ++idx) { |
| 2757 | // Check whether this direct base is inaccessible due to ambiguity. |
| 2758 | QualType BaseType = Bases[idx]->getType(); |
| 2759 | |
| 2760 | // Skip all dependent types in templates being used as base specifiers. |
| 2761 | // Checks below assume that the base specifier is a CXXRecord. |
| 2762 | if (BaseType->isDependentType()) |
| 2763 | continue; |
| 2764 | |
| 2765 | CanQualType CanonicalBase = Context.getCanonicalType(BaseType) |
| 2766 | .getUnqualifiedType(); |
| 2767 | |
| 2768 | if (IndirectBaseTypes.count(CanonicalBase)) { |
| 2769 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
| 2770 | /*DetectVirtual=*/true); |
| 2771 | bool found |
| 2772 | = Class->isDerivedFrom(CanonicalBase->getAsCXXRecordDecl(), Paths); |
| 2773 | assert(found)((void)0); |
| 2774 | (void)found; |
| 2775 | |
| 2776 | if (Paths.isAmbiguous(CanonicalBase)) |
| 2777 | Diag(Bases[idx]->getBeginLoc(), diag::warn_inaccessible_base_class) |
| 2778 | << BaseType << getAmbiguousPathsDisplayString(Paths) |
| 2779 | << Bases[idx]->getSourceRange(); |
| 2780 | else |
| 2781 | assert(Bases[idx]->isVirtual())((void)0); |
| 2782 | } |
| 2783 | |
| 2784 | // Delete the base class specifier, since its data has been copied |
| 2785 | // into the CXXRecordDecl. |
| 2786 | Context.Deallocate(Bases[idx]); |
| 2787 | } |
| 2788 | |
| 2789 | return Invalid; |
| 2790 | } |
| 2791 | |
| 2792 | /// ActOnBaseSpecifiers - Attach the given base specifiers to the |
| 2793 | /// class, after checking whether there are any duplicate base |
| 2794 | /// classes. |
| 2795 | void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, |
| 2796 | MutableArrayRef<CXXBaseSpecifier *> Bases) { |
| 2797 | if (!ClassDecl || Bases.empty()) |
| 2798 | return; |
| 2799 | |
| 2800 | AdjustDeclIfTemplate(ClassDecl); |
| 2801 | AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases); |
| 2802 | } |
| 2803 | |
| 2804 | /// Determine whether the type \p Derived is a C++ class that is |
| 2805 | /// derived from the type \p Base. |
| 2806 | bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base) { |
| 2807 | if (!getLangOpts().CPlusPlus) |
| 2808 | return false; |
| 2809 | |
| 2810 | CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); |
| 2811 | if (!DerivedRD) |
| 2812 | return false; |
| 2813 | |
| 2814 | CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); |
| 2815 | if (!BaseRD) |
| 2816 | return false; |
| 2817 | |
| 2818 | // If either the base or the derived type is invalid, don't try to |
| 2819 | // check whether one is derived from the other. |
| 2820 | if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) |
| 2821 | return false; |
| 2822 | |
| 2823 | // FIXME: In a modules build, do we need the entire path to be visible for us |
| 2824 | // to be able to use the inheritance relationship? |
| 2825 | if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined()) |
| 2826 | return false; |
| 2827 | |
| 2828 | return DerivedRD->isDerivedFrom(BaseRD); |
| 2829 | } |
| 2830 | |
| 2831 | /// Determine whether the type \p Derived is a C++ class that is |
| 2832 | /// derived from the type \p Base. |
| 2833 | bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base, |
| 2834 | CXXBasePaths &Paths) { |
| 2835 | if (!getLangOpts().CPlusPlus) |
| 2836 | return false; |
| 2837 | |
| 2838 | CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); |
| 2839 | if (!DerivedRD) |
| 2840 | return false; |
| 2841 | |
| 2842 | CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); |
| 2843 | if (!BaseRD) |
| 2844 | return false; |
| 2845 | |
| 2846 | if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined()) |
| 2847 | return false; |
| 2848 | |
| 2849 | return DerivedRD->isDerivedFrom(BaseRD, Paths); |
| 2850 | } |
| 2851 | |
| 2852 | static void BuildBasePathArray(const CXXBasePath &Path, |
| 2853 | CXXCastPath &BasePathArray) { |
| 2854 | // We first go backward and check if we have a virtual base. |
| 2855 | // FIXME: It would be better if CXXBasePath had the base specifier for |
| 2856 | // the nearest virtual base. |
| 2857 | unsigned Start = 0; |
| 2858 | for (unsigned I = Path.size(); I != 0; --I) { |
| 2859 | if (Path[I - 1].Base->isVirtual()) { |
| 2860 | Start = I - 1; |
| 2861 | break; |
| 2862 | } |
| 2863 | } |
| 2864 | |
| 2865 | // Now add all bases. |
| 2866 | for (unsigned I = Start, E = Path.size(); I != E; ++I) |
| 2867 | BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); |
| 2868 | } |
| 2869 | |
| 2870 | |
| 2871 | void Sema::BuildBasePathArray(const CXXBasePaths &Paths, |
| 2872 | CXXCastPath &BasePathArray) { |
| 2873 | assert(BasePathArray.empty() && "Base path array must be empty!")((void)0); |
| 2874 | assert(Paths.isRecordingPaths() && "Must record paths!")((void)0); |
| 2875 | return ::BuildBasePathArray(Paths.front(), BasePathArray); |
| 2876 | } |
| 2877 | /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base |
| 2878 | /// conversion (where Derived and Base are class types) is |
| 2879 | /// well-formed, meaning that the conversion is unambiguous (and |
| 2880 | /// that all of the base classes are accessible). Returns true |
| 2881 | /// and emits a diagnostic if the code is ill-formed, returns false |
| 2882 | /// otherwise. Loc is the location where this routine should point to |
| 2883 | /// if there is an error, and Range is the source range to highlight |
| 2884 | /// if there is an error. |
| 2885 | /// |
| 2886 | /// If either InaccessibleBaseID or AmbiguousBaseConvID are 0, then the |
| 2887 | /// diagnostic for the respective type of error will be suppressed, but the |
| 2888 | /// check for ill-formed code will still be performed. |
| 2889 | bool |
| 2890 | Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, |
| 2891 | unsigned InaccessibleBaseID, |
| 2892 | unsigned AmbiguousBaseConvID, |
| 2893 | SourceLocation Loc, SourceRange Range, |
| 2894 | DeclarationName Name, |
| 2895 | CXXCastPath *BasePath, |
| 2896 | bool IgnoreAccess) { |
| 2897 | // First, determine whether the path from Derived to Base is |
| 2898 | // ambiguous. This is slightly more expensive than checking whether |
| 2899 | // the Derived to Base conversion exists, because here we need to |
| 2900 | // explore multiple paths to determine if there is an ambiguity. |
| 2901 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
| 2902 | /*DetectVirtual=*/false); |
| 2903 | bool DerivationOkay = IsDerivedFrom(Loc, Derived, Base, Paths); |
| 2904 | if (!DerivationOkay) |
| 2905 | return true; |
| 2906 | |
| 2907 | const CXXBasePath *Path = nullptr; |
| 2908 | if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) |
| 2909 | Path = &Paths.front(); |
| 2910 | |
| 2911 | // For MSVC compatibility, check if Derived directly inherits from Base. Clang |
| 2912 | // warns about this hierarchy under -Winaccessible-base, but MSVC allows the |
| 2913 | // user to access such bases. |
| 2914 | if (!Path && getLangOpts().MSVCCompat) { |
| 2915 | for (const CXXBasePath &PossiblePath : Paths) { |
| 2916 | if (PossiblePath.size() == 1) { |
| 2917 | Path = &PossiblePath; |
| 2918 | if (AmbiguousBaseConvID) |
| 2919 | Diag(Loc, diag::ext_ms_ambiguous_direct_base) |
| 2920 | << Base << Derived << Range; |
| 2921 | break; |
| 2922 | } |
| 2923 | } |
| 2924 | } |
| 2925 | |
| 2926 | if (Path) { |
| 2927 | if (!IgnoreAccess) { |
| 2928 | // Check that the base class can be accessed. |
| 2929 | switch ( |
| 2930 | CheckBaseClassAccess(Loc, Base, Derived, *Path, InaccessibleBaseID)) { |
| 2931 | case AR_inaccessible: |
| 2932 | return true; |
| 2933 | case AR_accessible: |
| 2934 | case AR_dependent: |
| 2935 | case AR_delayed: |
| 2936 | break; |
| 2937 | } |
| 2938 | } |
| 2939 | |
| 2940 | // Build a base path if necessary. |
| 2941 | if (BasePath) |
| 2942 | ::BuildBasePathArray(*Path, *BasePath); |
| 2943 | return false; |
| 2944 | } |
| 2945 | |
| 2946 | if (AmbiguousBaseConvID) { |
| 2947 | // We know that the derived-to-base conversion is ambiguous, and |
| 2948 | // we're going to produce a diagnostic. Perform the derived-to-base |
| 2949 | // search just one more time to compute all of the possible paths so |
| 2950 | // that we can print them out. This is more expensive than any of |
| 2951 | // the previous derived-to-base checks we've done, but at this point |
| 2952 | // performance isn't as much of an issue. |
| 2953 | Paths.clear(); |
| 2954 | Paths.setRecordingPaths(true); |
| 2955 | bool StillOkay = IsDerivedFrom(Loc, Derived, Base, Paths); |
| 2956 | assert(StillOkay && "Can only be used with a derived-to-base conversion")((void)0); |
| 2957 | (void)StillOkay; |
| 2958 | |
| 2959 | // Build up a textual representation of the ambiguous paths, e.g., |
| 2960 | // D -> B -> A, that will be used to illustrate the ambiguous |
| 2961 | // conversions in the diagnostic. We only print one of the paths |
| 2962 | // to each base class subobject. |
| 2963 | std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); |
| 2964 | |
| 2965 | Diag(Loc, AmbiguousBaseConvID) |
| 2966 | << Derived << Base << PathDisplayStr << Range << Name; |
| 2967 | } |
| 2968 | return true; |
| 2969 | } |
| 2970 | |
| 2971 | bool |
| 2972 | Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, |
| 2973 | SourceLocation Loc, SourceRange Range, |
| 2974 | CXXCastPath *BasePath, |
| 2975 | bool IgnoreAccess) { |
| 2976 | return CheckDerivedToBaseConversion( |
| 2977 | Derived, Base, diag::err_upcast_to_inaccessible_base, |
| 2978 | diag::err_ambiguous_derived_to_base_conv, Loc, Range, DeclarationName(), |
| 2979 | BasePath, IgnoreAccess); |
| 2980 | } |
| 2981 | |
| 2982 | |
| 2983 | /// Builds a string representing ambiguous paths from a |
| 2984 | /// specific derived class to different subobjects of the same base |
| 2985 | /// class. |
| 2986 | /// |
| 2987 | /// This function builds a string that can be used in error messages |
| 2988 | /// to show the different paths that one can take through the |
| 2989 | /// inheritance hierarchy to go from the derived class to different |
| 2990 | /// subobjects of a base class. The result looks something like this: |
| 2991 | /// @code |
| 2992 | /// struct D -> struct B -> struct A |
| 2993 | /// struct D -> struct C -> struct A |
| 2994 | /// @endcode |
| 2995 | std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { |
| 2996 | std::string PathDisplayStr; |
| 2997 | std::set<unsigned> DisplayedPaths; |
| 2998 | for (CXXBasePaths::paths_iterator Path = Paths.begin(); |
| 2999 | Path != Paths.end(); ++Path) { |
| 3000 | if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { |
| 3001 | // We haven't displayed a path to this particular base |
| 3002 | // class subobject yet. |
| 3003 | PathDisplayStr += "\n "; |
| 3004 | PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); |
| 3005 | for (CXXBasePath::const_iterator Element = Path->begin(); |
| 3006 | Element != Path->end(); ++Element) |
| 3007 | PathDisplayStr += " -> " + Element->Base->getType().getAsString(); |
| 3008 | } |
| 3009 | } |
| 3010 | |
| 3011 | return PathDisplayStr; |
| 3012 | } |
| 3013 | |
| 3014 | //===----------------------------------------------------------------------===// |
| 3015 | // C++ class member Handling |
| 3016 | //===----------------------------------------------------------------------===// |
| 3017 | |
| 3018 | /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. |
| 3019 | bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, SourceLocation ASLoc, |
| 3020 | SourceLocation ColonLoc, |
| 3021 | const ParsedAttributesView &Attrs) { |
| 3022 | assert(Access != AS_none && "Invalid kind for syntactic access specifier!")((void)0); |
| 3023 | AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, |
| 3024 | ASLoc, ColonLoc); |
| 3025 | CurContext->addHiddenDecl(ASDecl); |
| 3026 | return ProcessAccessDeclAttributeList(ASDecl, Attrs); |
| 3027 | } |
| 3028 | |
| 3029 | /// CheckOverrideControl - Check C++11 override control semantics. |
| 3030 | void Sema::CheckOverrideControl(NamedDecl *D) { |
| 3031 | if (D->isInvalidDecl()) |
| 3032 | return; |
| 3033 | |
| 3034 | // We only care about "override" and "final" declarations. |
| 3035 | if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>()) |
| 3036 | return; |
| 3037 | |
| 3038 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); |
| 3039 | |
| 3040 | // We can't check dependent instance methods. |
| 3041 | if (MD && MD->isInstance() && |
| 3042 | (MD->getParent()->hasAnyDependentBases() || |
| 3043 | MD->getType()->isDependentType())) |
| 3044 | return; |
| 3045 | |
| 3046 | if (MD && !MD->isVirtual()) { |
| 3047 | // If we have a non-virtual method, check if if hides a virtual method. |
| 3048 | // (In that case, it's most likely the method has the wrong type.) |
| 3049 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; |
| 3050 | FindHiddenVirtualMethods(MD, OverloadedMethods); |
| 3051 | |
| 3052 | if (!OverloadedMethods.empty()) { |
| 3053 | if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { |
| 3054 | Diag(OA->getLocation(), |
| 3055 | diag::override_keyword_hides_virtual_member_function) |
| 3056 | << "override" << (OverloadedMethods.size() > 1); |
| 3057 | } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) { |
| 3058 | Diag(FA->getLocation(), |
| 3059 | diag::override_keyword_hides_virtual_member_function) |
| 3060 | << (FA->isSpelledAsSealed() ? "sealed" : "final") |
| 3061 | << (OverloadedMethods.size() > 1); |
| 3062 | } |
| 3063 | NoteHiddenVirtualMethods(MD, OverloadedMethods); |
| 3064 | MD->setInvalidDecl(); |
| 3065 | return; |
| 3066 | } |
| 3067 | // Fall through into the general case diagnostic. |
| 3068 | // FIXME: We might want to attempt typo correction here. |
| 3069 | } |
| 3070 | |
| 3071 | if (!MD || !MD->isVirtual()) { |
| 3072 | if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { |
| 3073 | Diag(OA->getLocation(), |
| 3074 | diag::override_keyword_only_allowed_on_virtual_member_functions) |
| 3075 | << "override" << FixItHint::CreateRemoval(OA->getLocation()); |
| 3076 | D->dropAttr<OverrideAttr>(); |
| 3077 | } |
| 3078 | if (FinalAttr *FA = D->getAttr<FinalAttr>()) { |
| 3079 | Diag(FA->getLocation(), |
| 3080 | diag::override_keyword_only_allowed_on_virtual_member_functions) |
| 3081 | << (FA->isSpelledAsSealed() ? "sealed" : "final") |
| 3082 | << FixItHint::CreateRemoval(FA->getLocation()); |
| 3083 | D->dropAttr<FinalAttr>(); |
| 3084 | } |
| 3085 | return; |
| 3086 | } |
| 3087 | |
| 3088 | // C++11 [class.virtual]p5: |
| 3089 | // If a function is marked with the virt-specifier override and |
| 3090 | // does not override a member function of a base class, the program is |
| 3091 | // ill-formed. |
| 3092 | bool HasOverriddenMethods = MD->size_overridden_methods() != 0; |
| 3093 | if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) |
| 3094 | Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) |
| 3095 | << MD->getDeclName(); |
| 3096 | } |
| 3097 | |
| 3098 | void Sema::DiagnoseAbsenceOfOverrideControl(NamedDecl *D, bool Inconsistent) { |
| 3099 | if (D->isInvalidDecl() || D->hasAttr<OverrideAttr>()) |
| 3100 | return; |
| 3101 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); |
| 3102 | if (!MD || MD->isImplicit() || MD->hasAttr<FinalAttr>()) |
| 3103 | return; |
| 3104 | |
| 3105 | SourceLocation Loc = MD->getLocation(); |
| 3106 | SourceLocation SpellingLoc = Loc; |
| 3107 | if (getSourceManager().isMacroArgExpansion(Loc)) |
| 3108 | SpellingLoc = getSourceManager().getImmediateExpansionRange(Loc).getBegin(); |
| 3109 | SpellingLoc = getSourceManager().getSpellingLoc(SpellingLoc); |
| 3110 | if (SpellingLoc.isValid() && getSourceManager().isInSystemHeader(SpellingLoc)) |
| 3111 | return; |
| 3112 | |
| 3113 | if (MD->size_overridden_methods() > 0) { |
| 3114 | auto EmitDiag = [&](unsigned DiagInconsistent, unsigned DiagSuggest) { |
| 3115 | unsigned DiagID = |
| 3116 | Inconsistent && !Diags.isIgnored(DiagInconsistent, MD->getLocation()) |
| 3117 | ? DiagInconsistent |
| 3118 | : DiagSuggest; |
| 3119 | Diag(MD->getLocation(), DiagID) << MD->getDeclName(); |
| 3120 | const CXXMethodDecl *OMD = *MD->begin_overridden_methods(); |
| 3121 | Diag(OMD->getLocation(), diag::note_overridden_virtual_function); |
| 3122 | }; |
| 3123 | if (isa<CXXDestructorDecl>(MD)) |
| 3124 | EmitDiag( |
| 3125 | diag::warn_inconsistent_destructor_marked_not_override_overriding, |
| 3126 | diag::warn_suggest_destructor_marked_not_override_overriding); |
| 3127 | else |
| 3128 | EmitDiag(diag::warn_inconsistent_function_marked_not_override_overriding, |
| 3129 | diag::warn_suggest_function_marked_not_override_overriding); |
| 3130 | } |
| 3131 | } |
| 3132 | |
| 3133 | /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member |
| 3134 | /// function overrides a virtual member function marked 'final', according to |
| 3135 | /// C++11 [class.virtual]p4. |
| 3136 | bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, |
| 3137 | const CXXMethodDecl *Old) { |
| 3138 | FinalAttr *FA = Old->getAttr<FinalAttr>(); |
| 3139 | if (!FA) |
| 3140 | return false; |
| 3141 | |
| 3142 | Diag(New->getLocation(), diag::err_final_function_overridden) |
| 3143 | << New->getDeclName() |
| 3144 | << FA->isSpelledAsSealed(); |
| 3145 | Diag(Old->getLocation(), diag::note_overridden_virtual_function); |
| 3146 | return true; |
| 3147 | } |
| 3148 | |
| 3149 | static bool InitializationHasSideEffects(const FieldDecl &FD) { |
| 3150 | const Type *T = FD.getType()->getBaseElementTypeUnsafe(); |
| 3151 | // FIXME: Destruction of ObjC lifetime types has side-effects. |
| 3152 | if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) |
| 3153 | return !RD->isCompleteDefinition() || |
| 3154 | !RD->hasTrivialDefaultConstructor() || |
| 3155 | !RD->hasTrivialDestructor(); |
| 3156 | return false; |
| 3157 | } |
| 3158 | |
| 3159 | static const ParsedAttr *getMSPropertyAttr(const ParsedAttributesView &list) { |
| 3160 | ParsedAttributesView::const_iterator Itr = |
| 3161 | llvm::find_if(list, [](const ParsedAttr &AL) { |
| 3162 | return AL.isDeclspecPropertyAttribute(); |
| 3163 | }); |
| 3164 | if (Itr != list.end()) |
| 3165 | return &*Itr; |
| 3166 | return nullptr; |
| 3167 | } |
| 3168 | |
| 3169 | // Check if there is a field shadowing. |
| 3170 | void Sema::CheckShadowInheritedFields(const SourceLocation &Loc, |
| 3171 | DeclarationName FieldName, |
| 3172 | const CXXRecordDecl *RD, |
| 3173 | bool DeclIsField) { |
| 3174 | if (Diags.isIgnored(diag::warn_shadow_field, Loc)) |
| 3175 | return; |
| 3176 | |
| 3177 | // To record a shadowed field in a base |
| 3178 | std::map<CXXRecordDecl*, NamedDecl*> Bases; |
| 3179 | auto FieldShadowed = [&](const CXXBaseSpecifier *Specifier, |
| 3180 | CXXBasePath &Path) { |
| 3181 | const auto Base = Specifier->getType()->getAsCXXRecordDecl(); |
| 3182 | // Record an ambiguous path directly |
| 3183 | if (Bases.find(Base) != Bases.end()) |
| 3184 | return true; |
| 3185 | for (const auto Field : Base->lookup(FieldName)) { |
| 3186 | if ((isa<FieldDecl>(Field) || isa<IndirectFieldDecl>(Field)) && |
| 3187 | Field->getAccess() != AS_private) { |
| 3188 | assert(Field->getAccess() != AS_none)((void)0); |
| 3189 | assert(Bases.find(Base) == Bases.end())((void)0); |
| 3190 | Bases[Base] = Field; |
| 3191 | return true; |
| 3192 | } |
| 3193 | } |
| 3194 | return false; |
| 3195 | }; |
| 3196 | |
| 3197 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
| 3198 | /*DetectVirtual=*/true); |
| 3199 | if (!RD->lookupInBases(FieldShadowed, Paths)) |
| 3200 | return; |
| 3201 | |
| 3202 | for (const auto &P : Paths) { |
| 3203 | auto Base = P.back().Base->getType()->getAsCXXRecordDecl(); |
| 3204 | auto It = Bases.find(Base); |
| 3205 | // Skip duplicated bases |
| 3206 | if (It == Bases.end()) |
| 3207 | continue; |
| 3208 | auto BaseField = It->second; |
| 3209 | assert(BaseField->getAccess() != AS_private)((void)0); |
| 3210 | if (AS_none != |
| 3211 | CXXRecordDecl::MergeAccess(P.Access, BaseField->getAccess())) { |
| 3212 | Diag(Loc, diag::warn_shadow_field) |
| 3213 | << FieldName << RD << Base << DeclIsField; |
| 3214 | Diag(BaseField->getLocation(), diag::note_shadow_field); |
| 3215 | Bases.erase(It); |
| 3216 | } |
| 3217 | } |
| 3218 | } |
| 3219 | |
| 3220 | /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member |
| 3221 | /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the |
| 3222 | /// bitfield width if there is one, 'InitExpr' specifies the initializer if |
| 3223 | /// one has been parsed, and 'InitStyle' is set if an in-class initializer is |
| 3224 | /// present (but parsing it has been deferred). |
| 3225 | NamedDecl * |
| 3226 | Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, |
| 3227 | MultiTemplateParamsArg TemplateParameterLists, |
| 3228 | Expr *BW, const VirtSpecifiers &VS, |
| 3229 | InClassInitStyle InitStyle) { |
| 3230 | const DeclSpec &DS = D.getDeclSpec(); |
| 3231 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); |
| 3232 | DeclarationName Name = NameInfo.getName(); |
| 3233 | SourceLocation Loc = NameInfo.getLoc(); |
| 3234 | |
| 3235 | // For anonymous bitfields, the location should point to the type. |
| 3236 | if (Loc.isInvalid()) |
| 3237 | Loc = D.getBeginLoc(); |
| 3238 | |
| 3239 | Expr *BitWidth = static_cast<Expr*>(BW); |
| 3240 | |
| 3241 | assert(isa<CXXRecordDecl>(CurContext))((void)0); |
| 3242 | assert(!DS.isFriendSpecified())((void)0); |
| 3243 | |
| 3244 | bool isFunc = D.isDeclarationOfFunction(); |
| 3245 | const ParsedAttr *MSPropertyAttr = |
| 3246 | getMSPropertyAttr(D.getDeclSpec().getAttributes()); |
| 3247 | |
| 3248 | if (cast<CXXRecordDecl>(CurContext)->isInterface()) { |
| 3249 | // The Microsoft extension __interface only permits public member functions |
| 3250 | // and prohibits constructors, destructors, operators, non-public member |
| 3251 | // functions, static methods and data members. |
| 3252 | unsigned InvalidDecl; |
| 3253 | bool ShowDeclName = true; |
| 3254 | if (!isFunc && |
| 3255 | (DS.getStorageClassSpec() == DeclSpec::SCS_typedef || MSPropertyAttr)) |
| 3256 | InvalidDecl = 0; |
| 3257 | else if (!isFunc) |
| 3258 | InvalidDecl = 1; |
| 3259 | else if (AS != AS_public) |
| 3260 | InvalidDecl = 2; |
| 3261 | else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) |
| 3262 | InvalidDecl = 3; |
| 3263 | else switch (Name.getNameKind()) { |
| 3264 | case DeclarationName::CXXConstructorName: |
| 3265 | InvalidDecl = 4; |
| 3266 | ShowDeclName = false; |
| 3267 | break; |
| 3268 | |
| 3269 | case DeclarationName::CXXDestructorName: |
| 3270 | InvalidDecl = 5; |
| 3271 | ShowDeclName = false; |
| 3272 | break; |
| 3273 | |
| 3274 | case DeclarationName::CXXOperatorName: |
| 3275 | case DeclarationName::CXXConversionFunctionName: |
| 3276 | InvalidDecl = 6; |
| 3277 | break; |
| 3278 | |
| 3279 | default: |
| 3280 | InvalidDecl = 0; |
| 3281 | break; |
| 3282 | } |
| 3283 | |
| 3284 | if (InvalidDecl) { |
| 3285 | if (ShowDeclName) |
| 3286 | Diag(Loc, diag::err_invalid_member_in_interface) |
| 3287 | << (InvalidDecl-1) << Name; |
| 3288 | else |
| 3289 | Diag(Loc, diag::err_invalid_member_in_interface) |
| 3290 | << (InvalidDecl-1) << ""; |
| 3291 | return nullptr; |
| 3292 | } |
| 3293 | } |
| 3294 | |
| 3295 | // C++ 9.2p6: A member shall not be declared to have automatic storage |
| 3296 | // duration (auto, register) or with the extern storage-class-specifier. |
| 3297 | // C++ 7.1.1p8: The mutable specifier can be applied only to names of class |
| 3298 | // data members and cannot be applied to names declared const or static, |
| 3299 | // and cannot be applied to reference members. |
| 3300 | switch (DS.getStorageClassSpec()) { |
| 3301 | case DeclSpec::SCS_unspecified: |
| 3302 | case DeclSpec::SCS_typedef: |
| 3303 | case DeclSpec::SCS_static: |
| 3304 | break; |
| 3305 | case DeclSpec::SCS_mutable: |
| 3306 | if (isFunc) { |
| 3307 | Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); |
| 3308 | |
| 3309 | // FIXME: It would be nicer if the keyword was ignored only for this |
| 3310 | // declarator. Otherwise we could get follow-up errors. |
| 3311 | D.getMutableDeclSpec().ClearStorageClassSpecs(); |
| 3312 | } |
| 3313 | break; |
| 3314 | default: |
| 3315 | Diag(DS.getStorageClassSpecLoc(), |
| 3316 | diag::err_storageclass_invalid_for_member); |
| 3317 | D.getMutableDeclSpec().ClearStorageClassSpecs(); |
| 3318 | break; |
| 3319 | } |
| 3320 | |
| 3321 | bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || |
| 3322 | DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && |
| 3323 | !isFunc); |
| 3324 | |
| 3325 | if (DS.hasConstexprSpecifier() && isInstField) { |
| 3326 | SemaDiagnosticBuilder B = |
| 3327 | Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); |
| 3328 | SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); |
| 3329 | if (InitStyle == ICIS_NoInit) { |
| 3330 | B << 0 << 0; |
| 3331 | if (D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) |
| 3332 | B << FixItHint::CreateRemoval(ConstexprLoc); |
| 3333 | else { |
| 3334 | B << FixItHint::CreateReplacement(ConstexprLoc, "const"); |
| 3335 | D.getMutableDeclSpec().ClearConstexprSpec(); |
| 3336 | const char *PrevSpec; |
| 3337 | unsigned DiagID; |
| 3338 | bool Failed = D.getMutableDeclSpec().SetTypeQual( |
| 3339 | DeclSpec::TQ_const, ConstexprLoc, PrevSpec, DiagID, getLangOpts()); |
| 3340 | (void)Failed; |
| 3341 | assert(!Failed && "Making a constexpr member const shouldn't fail")((void)0); |
| 3342 | } |
| 3343 | } else { |
| 3344 | B << 1; |
| 3345 | const char *PrevSpec; |
| 3346 | unsigned DiagID; |
| 3347 | if (D.getMutableDeclSpec().SetStorageClassSpec( |
| 3348 | *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID, |
| 3349 | Context.getPrintingPolicy())) { |
| 3350 | assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&((void)0) |
| 3351 | "This is the only DeclSpec that should fail to be applied")((void)0); |
| 3352 | B << 1; |
| 3353 | } else { |
| 3354 | B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); |
| 3355 | isInstField = false; |
| 3356 | } |
| 3357 | } |
| 3358 | } |
| 3359 | |
| 3360 | NamedDecl *Member; |
| 3361 | if (isInstField) { |
| 3362 | CXXScopeSpec &SS = D.getCXXScopeSpec(); |
| 3363 | |
| 3364 | // Data members must have identifiers for names. |
| 3365 | if (!Name.isIdentifier()) { |
| 3366 | Diag(Loc, diag::err_bad_variable_name) |
| 3367 | << Name; |
| 3368 | return nullptr; |
| 3369 | } |
| 3370 | |
| 3371 | IdentifierInfo *II = Name.getAsIdentifierInfo(); |
| 3372 | |
| 3373 | // Member field could not be with "template" keyword. |
| 3374 | // So TemplateParameterLists should be empty in this case. |
| 3375 | if (TemplateParameterLists.size()) { |
| 3376 | TemplateParameterList* TemplateParams = TemplateParameterLists[0]; |
| 3377 | if (TemplateParams->size()) { |
| 3378 | // There is no such thing as a member field template. |
| 3379 | Diag(D.getIdentifierLoc(), diag::err_template_member) |
| 3380 | << II |
| 3381 | << SourceRange(TemplateParams->getTemplateLoc(), |
| 3382 | TemplateParams->getRAngleLoc()); |
| 3383 | } else { |
| 3384 | // There is an extraneous 'template<>' for this member. |
| 3385 | Diag(TemplateParams->getTemplateLoc(), |
| 3386 | diag::err_template_member_noparams) |
| 3387 | << II |
| 3388 | << SourceRange(TemplateParams->getTemplateLoc(), |
| 3389 | TemplateParams->getRAngleLoc()); |
| 3390 | } |
| 3391 | return nullptr; |
| 3392 | } |
| 3393 | |
| 3394 | if (SS.isSet() && !SS.isInvalid()) { |
| 3395 | // The user provided a superfluous scope specifier inside a class |
| 3396 | // definition: |
| 3397 | // |
| 3398 | // class X { |
| 3399 | // int X::member; |
| 3400 | // }; |
| 3401 | if (DeclContext *DC = computeDeclContext(SS, false)) |
| 3402 | diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc(), |
| 3403 | D.getName().getKind() == |
| 3404 | UnqualifiedIdKind::IK_TemplateId); |
| 3405 | else |
| 3406 | Diag(D.getIdentifierLoc(), diag::err_member_qualification) |
| 3407 | << Name << SS.getRange(); |
| 3408 | |
| 3409 | SS.clear(); |
| 3410 | } |
| 3411 | |
| 3412 | if (MSPropertyAttr) { |
| 3413 | Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, |
| 3414 | BitWidth, InitStyle, AS, *MSPropertyAttr); |
| 3415 | if (!Member) |
| 3416 | return nullptr; |
| 3417 | isInstField = false; |
| 3418 | } else { |
| 3419 | Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, |
| 3420 | BitWidth, InitStyle, AS); |
| 3421 | if (!Member) |
| 3422 | return nullptr; |
| 3423 | } |
| 3424 | |
| 3425 | CheckShadowInheritedFields(Loc, Name, cast<CXXRecordDecl>(CurContext)); |
| 3426 | } else { |
| 3427 | Member = HandleDeclarator(S, D, TemplateParameterLists); |
| 3428 | if (!Member) |
| 3429 | return nullptr; |
| 3430 | |
| 3431 | // Non-instance-fields can't have a bitfield. |
| 3432 | if (BitWidth) { |
| 3433 | if (Member->isInvalidDecl()) { |
| 3434 | // don't emit another diagnostic. |
| 3435 | } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) { |
| 3436 | // C++ 9.6p3: A bit-field shall not be a static member. |
| 3437 | // "static member 'A' cannot be a bit-field" |
| 3438 | Diag(Loc, diag::err_static_not_bitfield) |
| 3439 | << Name << BitWidth->getSourceRange(); |
| 3440 | } else if (isa<TypedefDecl>(Member)) { |
| 3441 | // "typedef member 'x' cannot be a bit-field" |
| 3442 | Diag(Loc, diag::err_typedef_not_bitfield) |
| 3443 | << Name << BitWidth->getSourceRange(); |
| 3444 | } else { |
| 3445 | // A function typedef ("typedef int f(); f a;"). |
| 3446 | // C++ 9.6p3: A bit-field shall have integral or enumeration type. |
| 3447 | Diag(Loc, diag::err_not_integral_type_bitfield) |
| 3448 | << Name << cast<ValueDecl>(Member)->getType() |
| 3449 | << BitWidth->getSourceRange(); |
| 3450 | } |
| 3451 | |
| 3452 | BitWidth = nullptr; |
| 3453 | Member->setInvalidDecl(); |
| 3454 | } |
| 3455 | |
| 3456 | NamedDecl *NonTemplateMember = Member; |
| 3457 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) |
| 3458 | NonTemplateMember = FunTmpl->getTemplatedDecl(); |
| 3459 | else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member)) |
| 3460 | NonTemplateMember = VarTmpl->getTemplatedDecl(); |
| 3461 | |
| 3462 | Member->setAccess(AS); |
| 3463 | |
| 3464 | // If we have declared a member function template or static data member |
| 3465 | // template, set the access of the templated declaration as well. |
| 3466 | if (NonTemplateMember != Member) |
| 3467 | NonTemplateMember->setAccess(AS); |
| 3468 | |
| 3469 | // C++ [temp.deduct.guide]p3: |
| 3470 | // A deduction guide [...] for a member class template [shall be |
| 3471 | // declared] with the same access [as the template]. |
| 3472 | if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(NonTemplateMember)) { |
| 3473 | auto *TD = DG->getDeducedTemplate(); |
| 3474 | // Access specifiers are only meaningful if both the template and the |
| 3475 | // deduction guide are from the same scope. |
| 3476 | if (AS != TD->getAccess() && |
| 3477 | TD->getDeclContext()->getRedeclContext()->Equals( |
| 3478 | DG->getDeclContext()->getRedeclContext())) { |
| 3479 | Diag(DG->getBeginLoc(), diag::err_deduction_guide_wrong_access); |
| 3480 | Diag(TD->getBeginLoc(), diag::note_deduction_guide_template_access) |
| 3481 | << TD->getAccess(); |
| 3482 | const AccessSpecDecl *LastAccessSpec = nullptr; |
| 3483 | for (const auto *D : cast<CXXRecordDecl>(CurContext)->decls()) { |
| 3484 | if (const auto *AccessSpec = dyn_cast<AccessSpecDecl>(D)) |
| 3485 | LastAccessSpec = AccessSpec; |
| 3486 | } |
| 3487 | assert(LastAccessSpec && "differing access with no access specifier")((void)0); |
| 3488 | Diag(LastAccessSpec->getBeginLoc(), diag::note_deduction_guide_access) |
| 3489 | << AS; |
| 3490 | } |
| 3491 | } |
| 3492 | } |
| 3493 | |
| 3494 | if (VS.isOverrideSpecified()) |
| 3495 | Member->addAttr(OverrideAttr::Create(Context, VS.getOverrideLoc(), |
| 3496 | AttributeCommonInfo::AS_Keyword)); |
| 3497 | if (VS.isFinalSpecified()) |
| 3498 | Member->addAttr(FinalAttr::Create( |
| 3499 | Context, VS.getFinalLoc(), AttributeCommonInfo::AS_Keyword, |
| 3500 | static_cast<FinalAttr::Spelling>(VS.isFinalSpelledSealed()))); |
| 3501 | |
| 3502 | if (VS.getLastLocation().isValid()) { |
| 3503 | // Update the end location of a method that has a virt-specifiers. |
| 3504 | if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) |
| 3505 | MD->setRangeEnd(VS.getLastLocation()); |
| 3506 | } |
| 3507 | |
| 3508 | CheckOverrideControl(Member); |
| 3509 | |
| 3510 | assert((Name || isInstField) && "No identifier for non-field ?")((void)0); |
| 3511 | |
| 3512 | if (isInstField) { |
| 3513 | FieldDecl *FD = cast<FieldDecl>(Member); |
| 3514 | FieldCollector->Add(FD); |
| 3515 | |
| 3516 | if (!Diags.isIgnored(diag::warn_unused_private_field, FD->getLocation())) { |
| 3517 | // Remember all explicit private FieldDecls that have a name, no side |
| 3518 | // effects and are not part of a dependent type declaration. |
| 3519 | if (!FD->isImplicit() && FD->getDeclName() && |
| 3520 | FD->getAccess() == AS_private && |
| 3521 | !FD->hasAttr<UnusedAttr>() && |
| 3522 | !FD->getParent()->isDependentContext() && |
| 3523 | !InitializationHasSideEffects(*FD)) |
| 3524 | UnusedPrivateFields.insert(FD); |
| 3525 | } |
| 3526 | } |
| 3527 | |
| 3528 | return Member; |
| 3529 | } |
| 3530 | |
| 3531 | namespace { |
| 3532 | class UninitializedFieldVisitor |
| 3533 | : public EvaluatedExprVisitor<UninitializedFieldVisitor> { |
| 3534 | Sema &S; |
| 3535 | // List of Decls to generate a warning on. Also remove Decls that become |
| 3536 | // initialized. |
| 3537 | llvm::SmallPtrSetImpl<ValueDecl*> &Decls; |
| 3538 | // List of base classes of the record. Classes are removed after their |
| 3539 | // initializers. |
| 3540 | llvm::SmallPtrSetImpl<QualType> &BaseClasses; |
| 3541 | // Vector of decls to be removed from the Decl set prior to visiting the |
| 3542 | // nodes. These Decls may have been initialized in the prior initializer. |
| 3543 | llvm::SmallVector<ValueDecl*, 4> DeclsToRemove; |
| 3544 | // If non-null, add a note to the warning pointing back to the constructor. |
| 3545 | const CXXConstructorDecl *Constructor; |
| 3546 | // Variables to hold state when processing an initializer list. When |
| 3547 | // InitList is true, special case initialization of FieldDecls matching |
| 3548 | // InitListFieldDecl. |
| 3549 | bool InitList; |
| 3550 | FieldDecl *InitListFieldDecl; |
| 3551 | llvm::SmallVector<unsigned, 4> InitFieldIndex; |
| 3552 | |
| 3553 | public: |
| 3554 | typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; |
| 3555 | UninitializedFieldVisitor(Sema &S, |
| 3556 | llvm::SmallPtrSetImpl<ValueDecl*> &Decls, |
| 3557 | llvm::SmallPtrSetImpl<QualType> &BaseClasses) |
| 3558 | : Inherited(S.Context), S(S), Decls(Decls), BaseClasses(BaseClasses), |
| 3559 | Constructor(nullptr), InitList(false), InitListFieldDecl(nullptr) {} |
| 3560 | |
| 3561 | // Returns true if the use of ME is not an uninitialized use. |
| 3562 | bool IsInitListMemberExprInitialized(MemberExpr *ME, |
| 3563 | bool CheckReferenceOnly) { |
| 3564 | llvm::SmallVector<FieldDecl*, 4> Fields; |
| 3565 | bool ReferenceField = false; |
| 3566 | while (ME) { |
| 3567 | FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()); |
| 3568 | if (!FD) |
| 3569 | return false; |
| 3570 | Fields.push_back(FD); |
| 3571 | if (FD->getType()->isReferenceType()) |
| 3572 | ReferenceField = true; |
| 3573 | ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParenImpCasts()); |
| 3574 | } |
| 3575 | |
| 3576 | // Binding a reference to an uninitialized field is not an |
| 3577 | // uninitialized use. |
| 3578 | if (CheckReferenceOnly && !ReferenceField) |
| 3579 | return true; |
| 3580 | |
| 3581 | llvm::SmallVector<unsigned, 4> UsedFieldIndex; |
| 3582 | // Discard the first field since it is the field decl that is being |
| 3583 | // initialized. |
| 3584 | for (auto I = Fields.rbegin() + 1, E = Fields.rend(); I != E; ++I) { |
| 3585 | UsedFieldIndex.push_back((*I)->getFieldIndex()); |
| 3586 | } |
| 3587 | |
| 3588 | for (auto UsedIter = UsedFieldIndex.begin(), |
| 3589 | UsedEnd = UsedFieldIndex.end(), |
| 3590 | OrigIter = InitFieldIndex.begin(), |
| 3591 | OrigEnd = InitFieldIndex.end(); |
| 3592 | UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) { |
| 3593 | if (*UsedIter < *OrigIter) |
| 3594 | return true; |
| 3595 | if (*UsedIter > *OrigIter) |
| 3596 | break; |
| 3597 | } |
| 3598 | |
| 3599 | return false; |
| 3600 | } |
| 3601 | |
| 3602 | void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly, |
| 3603 | bool AddressOf) { |
| 3604 | if (isa<EnumConstantDecl>(ME->getMemberDecl())) |
| 3605 | return; |
| 3606 | |
| 3607 | // FieldME is the inner-most MemberExpr that is not an anonymous struct |
| 3608 | // or union. |
| 3609 | MemberExpr *FieldME = ME; |
| 3610 | |
| 3611 | bool AllPODFields = FieldME->getType().isPODType(S.Context); |
| 3612 | |
| 3613 | Expr *Base = ME; |
| 3614 | while (MemberExpr *SubME = |
| 3615 | dyn_cast<MemberExpr>(Base->IgnoreParenImpCasts())) { |
| 3616 | |
| 3617 | if (isa<VarDecl>(SubME->getMemberDecl())) |
| 3618 | return; |
| 3619 | |
| 3620 | if (FieldDecl *FD = dyn_cast<FieldDecl>(SubME->getMemberDecl())) |
| 3621 | if (!FD->isAnonymousStructOrUnion()) |
| 3622 | FieldME = SubME; |
| 3623 | |
| 3624 | if (!FieldME->getType().isPODType(S.Context)) |
| 3625 | AllPODFields = false; |
| 3626 | |
| 3627 | Base = SubME->getBase(); |
| 3628 | } |
| 3629 | |
| 3630 | if (!isa<CXXThisExpr>(Base->IgnoreParenImpCasts())) { |
| 3631 | Visit(Base); |
| 3632 | return; |
| 3633 | } |
| 3634 | |
| 3635 | if (AddressOf && AllPODFields) |
| 3636 | return; |
| 3637 | |
| 3638 | ValueDecl* FoundVD = FieldME->getMemberDecl(); |
| 3639 | |
| 3640 | if (ImplicitCastExpr *BaseCast = dyn_cast<ImplicitCastExpr>(Base)) { |
| 3641 | while (isa<ImplicitCastExpr>(BaseCast->getSubExpr())) { |
| 3642 | BaseCast = cast<ImplicitCastExpr>(BaseCast->getSubExpr()); |
| 3643 | } |
| 3644 | |
| 3645 | if (BaseCast->getCastKind() == CK_UncheckedDerivedToBase) { |
| 3646 | QualType T = BaseCast->getType(); |
| 3647 | if (T->isPointerType() && |
| 3648 | BaseClasses.count(T->getPointeeType())) { |
| 3649 | S.Diag(FieldME->getExprLoc(), diag::warn_base_class_is_uninit) |
| 3650 | << T->getPointeeType() << FoundVD; |
| 3651 | } |
| 3652 | } |
| 3653 | } |
| 3654 | |
| 3655 | if (!Decls.count(FoundVD)) |
| 3656 | return; |
| 3657 | |
| 3658 | const bool IsReference = FoundVD->getType()->isReferenceType(); |
| 3659 | |
| 3660 | if (InitList && !AddressOf && FoundVD == InitListFieldDecl) { |
| 3661 | // Special checking for initializer lists. |
| 3662 | if (IsInitListMemberExprInitialized(ME, CheckReferenceOnly)) { |
| 3663 | return; |
| 3664 | } |
| 3665 | } else { |
| 3666 | // Prevent double warnings on use of unbounded references. |
| 3667 | if (CheckReferenceOnly && !IsReference) |
| 3668 | return; |
| 3669 | } |
| 3670 | |
| 3671 | unsigned diag = IsReference |
| 3672 | ? diag::warn_reference_field_is_uninit |
| 3673 | : diag::warn_field_is_uninit; |
| 3674 | S.Diag(FieldME->getExprLoc(), diag) << FoundVD; |
| 3675 | if (Constructor) |
| 3676 | S.Diag(Constructor->getLocation(), |
| 3677 | diag::note_uninit_in_this_constructor) |
| 3678 | << (Constructor->isDefaultConstructor() && Constructor->isImplicit()); |
| 3679 | |
| 3680 | } |
| 3681 | |
| 3682 | void HandleValue(Expr *E, bool AddressOf) { |
| 3683 | E = E->IgnoreParens(); |
| 3684 | |
| 3685 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { |
| 3686 | HandleMemberExpr(ME, false /*CheckReferenceOnly*/, |
| 3687 | AddressOf /*AddressOf*/); |
| 3688 | return; |
| 3689 | } |
| 3690 | |
| 3691 | if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { |
| 3692 | Visit(CO->getCond()); |
| 3693 | HandleValue(CO->getTrueExpr(), AddressOf); |
| 3694 | HandleValue(CO->getFalseExpr(), AddressOf); |
| 3695 | return; |
| 3696 | } |
| 3697 | |
| 3698 | if (BinaryConditionalOperator *BCO = |
| 3699 | dyn_cast<BinaryConditionalOperator>(E)) { |
| 3700 | Visit(BCO->getCond()); |
| 3701 | HandleValue(BCO->getFalseExpr(), AddressOf); |
| 3702 | return; |
| 3703 | } |
| 3704 | |
| 3705 | if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { |
| 3706 | HandleValue(OVE->getSourceExpr(), AddressOf); |
| 3707 | return; |
| 3708 | } |
| 3709 | |
| 3710 | if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { |
| 3711 | switch (BO->getOpcode()) { |
| 3712 | default: |
| 3713 | break; |
| 3714 | case(BO_PtrMemD): |
| 3715 | case(BO_PtrMemI): |
| 3716 | HandleValue(BO->getLHS(), AddressOf); |
| 3717 | Visit(BO->getRHS()); |
| 3718 | return; |
| 3719 | case(BO_Comma): |
| 3720 | Visit(BO->getLHS()); |
| 3721 | HandleValue(BO->getRHS(), AddressOf); |
| 3722 | return; |
| 3723 | } |
| 3724 | } |
| 3725 | |
| 3726 | Visit(E); |
| 3727 | } |
| 3728 | |
| 3729 | void CheckInitListExpr(InitListExpr *ILE) { |
| 3730 | InitFieldIndex.push_back(0); |
| 3731 | for (auto Child : ILE->children()) { |
| 3732 | if (InitListExpr *SubList = dyn_cast<InitListExpr>(Child)) { |
| 3733 | CheckInitListExpr(SubList); |
| 3734 | } else { |
| 3735 | Visit(Child); |
| 3736 | } |
| 3737 | ++InitFieldIndex.back(); |
| 3738 | } |
| 3739 | InitFieldIndex.pop_back(); |
| 3740 | } |
| 3741 | |
| 3742 | void CheckInitializer(Expr *E, const CXXConstructorDecl *FieldConstructor, |
| 3743 | FieldDecl *Field, const Type *BaseClass) { |
| 3744 | // Remove Decls that may have been initialized in the previous |
| 3745 | // initializer. |
| 3746 | for (ValueDecl* VD : DeclsToRemove) |
| 3747 | Decls.erase(VD); |
| 3748 | DeclsToRemove.clear(); |
| 3749 | |
| 3750 | Constructor = FieldConstructor; |
| 3751 | InitListExpr *ILE = dyn_cast<InitListExpr>(E); |
| 3752 | |
| 3753 | if (ILE && Field) { |
| 3754 | InitList = true; |
| 3755 | InitListFieldDecl = Field; |
| 3756 | InitFieldIndex.clear(); |
| 3757 | CheckInitListExpr(ILE); |
| 3758 | } else { |
| 3759 | InitList = false; |
| 3760 | Visit(E); |
| 3761 | } |
| 3762 | |
| 3763 | if (Field) |
| 3764 | Decls.erase(Field); |
| 3765 | if (BaseClass) |
| 3766 | BaseClasses.erase(BaseClass->getCanonicalTypeInternal()); |
| 3767 | } |
| 3768 | |
| 3769 | void VisitMemberExpr(MemberExpr *ME) { |
| 3770 | // All uses of unbounded reference fields will warn. |
| 3771 | HandleMemberExpr(ME, true /*CheckReferenceOnly*/, false /*AddressOf*/); |
| 3772 | } |
| 3773 | |
| 3774 | void VisitImplicitCastExpr(ImplicitCastExpr *E) { |
| 3775 | if (E->getCastKind() == CK_LValueToRValue) { |
| 3776 | HandleValue(E->getSubExpr(), false /*AddressOf*/); |
| 3777 | return; |
| 3778 | } |
| 3779 | |
| 3780 | Inherited::VisitImplicitCastExpr(E); |
| 3781 | } |
| 3782 | |
| 3783 | void VisitCXXConstructExpr(CXXConstructExpr *E) { |
| 3784 | if (E->getConstructor()->isCopyConstructor()) { |
| 3785 | Expr *ArgExpr = E->getArg(0); |
| 3786 | if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr)) |
| 3787 | if (ILE->getNumInits() == 1) |
| 3788 | ArgExpr = ILE->getInit(0); |
| 3789 | if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr)) |
| 3790 | if (ICE->getCastKind() == CK_NoOp) |
| 3791 | ArgExpr = ICE->getSubExpr(); |
| 3792 | HandleValue(ArgExpr, false /*AddressOf*/); |
| 3793 | return; |
| 3794 | } |
| 3795 | Inherited::VisitCXXConstructExpr(E); |
| 3796 | } |
| 3797 | |
| 3798 | void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { |
| 3799 | Expr *Callee = E->getCallee(); |
| 3800 | if (isa<MemberExpr>(Callee)) { |
| 3801 | HandleValue(Callee, false /*AddressOf*/); |
| 3802 | for (auto Arg : E->arguments()) |
| 3803 | Visit(Arg); |
| 3804 | return; |
| 3805 | } |
| 3806 | |
| 3807 | Inherited::VisitCXXMemberCallExpr(E); |
| 3808 | } |
| 3809 | |
| 3810 | void VisitCallExpr(CallExpr *E) { |
| 3811 | // Treat std::move as a use. |
| 3812 | if (E->isCallToStdMove()) { |
| 3813 | HandleValue(E->getArg(0), /*AddressOf=*/false); |
| 3814 | return; |
| 3815 | } |
| 3816 | |
| 3817 | Inherited::VisitCallExpr(E); |
| 3818 | } |
| 3819 | |
| 3820 | void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) { |
| 3821 | Expr *Callee = E->getCallee(); |
| 3822 | |
| 3823 | if (isa<UnresolvedLookupExpr>(Callee)) |
| 3824 | return Inherited::VisitCXXOperatorCallExpr(E); |
| 3825 | |
| 3826 | Visit(Callee); |
| 3827 | for (auto Arg : E->arguments()) |
| 3828 | HandleValue(Arg->IgnoreParenImpCasts(), false /*AddressOf*/); |
| 3829 | } |
| 3830 | |
| 3831 | void VisitBinaryOperator(BinaryOperator *E) { |
| 3832 | // If a field assignment is detected, remove the field from the |
| 3833 | // uninitiailized field set. |
| 3834 | if (E->getOpcode() == BO_Assign) |
| 3835 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS())) |
| 3836 | if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) |
| 3837 | if (!FD->getType()->isReferenceType()) |
| 3838 | DeclsToRemove.push_back(FD); |
| 3839 | |
| 3840 | if (E->isCompoundAssignmentOp()) { |
| 3841 | HandleValue(E->getLHS(), false /*AddressOf*/); |
| 3842 | Visit(E->getRHS()); |
| 3843 | return; |
| 3844 | } |
| 3845 | |
| 3846 | Inherited::VisitBinaryOperator(E); |
| 3847 | } |
| 3848 | |
| 3849 | void VisitUnaryOperator(UnaryOperator *E) { |
| 3850 | if (E->isIncrementDecrementOp()) { |
| 3851 | HandleValue(E->getSubExpr(), false /*AddressOf*/); |
| 3852 | return; |
| 3853 | } |
| 3854 | if (E->getOpcode() == UO_AddrOf) { |
| 3855 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getSubExpr())) { |
| 3856 | HandleValue(ME->getBase(), true /*AddressOf*/); |
| 3857 | return; |
| 3858 | } |
| 3859 | } |
| 3860 | |
| 3861 | Inherited::VisitUnaryOperator(E); |
| 3862 | } |
| 3863 | }; |
| 3864 | |
| 3865 | // Diagnose value-uses of fields to initialize themselves, e.g. |
| 3866 | // foo(foo) |
| 3867 | // where foo is not also a parameter to the constructor. |
| 3868 | // Also diagnose across field uninitialized use such as |
| 3869 | // x(y), y(x) |
| 3870 | // TODO: implement -Wuninitialized and fold this into that framework. |
| 3871 | static void DiagnoseUninitializedFields( |
| 3872 | Sema &SemaRef, const CXXConstructorDecl *Constructor) { |
| 3873 | |
| 3874 | if (SemaRef.getDiagnostics().isIgnored(diag::warn_field_is_uninit, |
| 3875 | Constructor->getLocation())) { |
| 3876 | return; |
| 3877 | } |
| 3878 | |
| 3879 | if (Constructor->isInvalidDecl()) |
| 3880 | return; |
| 3881 | |
| 3882 | const CXXRecordDecl *RD = Constructor->getParent(); |
| 3883 | |
| 3884 | if (RD->isDependentContext()) |
| 3885 | return; |
| 3886 | |
| 3887 | // Holds fields that are uninitialized. |
| 3888 | llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields; |
| 3889 | |
| 3890 | // At the beginning, all fields are uninitialized. |
| 3891 | for (auto *I : RD->decls()) { |
| 3892 | if (auto *FD = dyn_cast<FieldDecl>(I)) { |
| 3893 | UninitializedFields.insert(FD); |
| 3894 | } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(I)) { |
| 3895 | UninitializedFields.insert(IFD->getAnonField()); |
| 3896 | } |
| 3897 | } |
| 3898 | |
| 3899 | llvm::SmallPtrSet<QualType, 4> UninitializedBaseClasses; |
| 3900 | for (auto I : RD->bases()) |
| 3901 | UninitializedBaseClasses.insert(I.getType().getCanonicalType()); |
| 3902 | |
| 3903 | if (UninitializedFields.empty() && UninitializedBaseClasses.empty()) |
| 3904 | return; |
| 3905 | |
| 3906 | UninitializedFieldVisitor UninitializedChecker(SemaRef, |
| 3907 | UninitializedFields, |
| 3908 | UninitializedBaseClasses); |
| 3909 | |
| 3910 | for (const auto *FieldInit : Constructor->inits()) { |
| 3911 | if (UninitializedFields.empty() && UninitializedBaseClasses.empty()) |
| 3912 | break; |
| 3913 | |
| 3914 | Expr *InitExpr = FieldInit->getInit(); |
| 3915 | if (!InitExpr) |
| 3916 | continue; |
| 3917 | |
| 3918 | if (CXXDefaultInitExpr *Default = |
| 3919 | dyn_cast<CXXDefaultInitExpr>(InitExpr)) { |
| 3920 | InitExpr = Default->getExpr(); |
| 3921 | if (!InitExpr) |
| 3922 | continue; |
| 3923 | // In class initializers will point to the constructor. |
| 3924 | UninitializedChecker.CheckInitializer(InitExpr, Constructor, |
| 3925 | FieldInit->getAnyMember(), |
| 3926 | FieldInit->getBaseClass()); |
| 3927 | } else { |
| 3928 | UninitializedChecker.CheckInitializer(InitExpr, nullptr, |
| 3929 | FieldInit->getAnyMember(), |
| 3930 | FieldInit->getBaseClass()); |
| 3931 | } |
| 3932 | } |
| 3933 | } |
| 3934 | } // namespace |
| 3935 | |
| 3936 | /// Enter a new C++ default initializer scope. After calling this, the |
| 3937 | /// caller must call \ref ActOnFinishCXXInClassMemberInitializer, even if |
| 3938 | /// parsing or instantiating the initializer failed. |
| 3939 | void Sema::ActOnStartCXXInClassMemberInitializer() { |
| 3940 | // Create a synthetic function scope to represent the call to the constructor |
| 3941 | // that notionally surrounds a use of this initializer. |
| 3942 | PushFunctionScope(); |
| 3943 | } |
| 3944 | |
| 3945 | void Sema::ActOnStartTrailingRequiresClause(Scope *S, Declarator &D) { |
| 3946 | if (!D.isFunctionDeclarator()) |
| 3947 | return; |
| 3948 | auto &FTI = D.getFunctionTypeInfo(); |
| 3949 | if (!FTI.Params) |
| 3950 | return; |
| 3951 | for (auto &Param : ArrayRef<DeclaratorChunk::ParamInfo>(FTI.Params, |
| 3952 | FTI.NumParams)) { |
| 3953 | auto *ParamDecl = cast<NamedDecl>(Param.Param); |
| 3954 | if (ParamDecl->getDeclName()) |
| 3955 | PushOnScopeChains(ParamDecl, S, /*AddToContext=*/false); |
| 3956 | } |
| 3957 | } |
| 3958 | |
| 3959 | ExprResult Sema::ActOnFinishTrailingRequiresClause(ExprResult ConstraintExpr) { |
| 3960 | return ActOnRequiresClause(ConstraintExpr); |
| 3961 | } |
| 3962 | |
| 3963 | ExprResult Sema::ActOnRequiresClause(ExprResult ConstraintExpr) { |
| 3964 | if (ConstraintExpr.isInvalid()) |
| 3965 | return ExprError(); |
| 3966 | |
| 3967 | ConstraintExpr = CorrectDelayedTyposInExpr(ConstraintExpr); |
| 3968 | if (ConstraintExpr.isInvalid()) |
| 3969 | return ExprError(); |
| 3970 | |
| 3971 | if (DiagnoseUnexpandedParameterPack(ConstraintExpr.get(), |
| 3972 | UPPC_RequiresClause)) |
| 3973 | return ExprError(); |
| 3974 | |
| 3975 | return ConstraintExpr; |
| 3976 | } |
| 3977 | |
| 3978 | /// This is invoked after parsing an in-class initializer for a |
| 3979 | /// non-static C++ class member, and after instantiating an in-class initializer |
| 3980 | /// in a class template. Such actions are deferred until the class is complete. |
| 3981 | void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D, |
| 3982 | SourceLocation InitLoc, |
| 3983 | Expr *InitExpr) { |
| 3984 | // Pop the notional constructor scope we created earlier. |
| 3985 | PopFunctionScopeInfo(nullptr, D); |
| 3986 | |
| 3987 | FieldDecl *FD = dyn_cast<FieldDecl>(D); |
| 3988 | assert((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) &&((void)0) |
| 3989 | "must set init style when field is created")((void)0); |
| 3990 | |
| 3991 | if (!InitExpr) { |
| 3992 | D->setInvalidDecl(); |
| 3993 | if (FD) |
| 3994 | FD->removeInClassInitializer(); |
| 3995 | return; |
| 3996 | } |
| 3997 | |
| 3998 | if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { |
| 3999 | FD->setInvalidDecl(); |
| 4000 | FD->removeInClassInitializer(); |
| 4001 | return; |
| 4002 | } |
| 4003 | |
| 4004 | ExprResult Init = InitExpr; |
| 4005 | if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { |
| 4006 | InitializedEntity Entity = |
| 4007 | InitializedEntity::InitializeMemberFromDefaultMemberInitializer(FD); |
| 4008 | InitializationKind Kind = |
| 4009 | FD->getInClassInitStyle() == ICIS_ListInit |
| 4010 | ? InitializationKind::CreateDirectList(InitExpr->getBeginLoc(), |
| 4011 | InitExpr->getBeginLoc(), |
| 4012 | InitExpr->getEndLoc()) |
| 4013 | : InitializationKind::CreateCopy(InitExpr->getBeginLoc(), InitLoc); |
| 4014 | InitializationSequence Seq(*this, Entity, Kind, InitExpr); |
| 4015 | Init = Seq.Perform(*this, Entity, Kind, InitExpr); |
| 4016 | if (Init.isInvalid()) { |
| 4017 | FD->setInvalidDecl(); |
| 4018 | return; |
| 4019 | } |
| 4020 | } |
| 4021 | |
| 4022 | // C++11 [class.base.init]p7: |
| 4023 | // The initialization of each base and member constitutes a |
| 4024 | // full-expression. |
| 4025 | Init = ActOnFinishFullExpr(Init.get(), InitLoc, /*DiscardedValue*/ false); |
| 4026 | if (Init.isInvalid()) { |
| 4027 | FD->setInvalidDecl(); |
| 4028 | return; |
| 4029 | } |
| 4030 | |
| 4031 | InitExpr = Init.get(); |
| 4032 | |
| 4033 | FD->setInClassInitializer(InitExpr); |
| 4034 | } |
| 4035 | |
| 4036 | /// Find the direct and/or virtual base specifiers that |
| 4037 | /// correspond to the given base type, for use in base initialization |
| 4038 | /// within a constructor. |
| 4039 | static bool FindBaseInitializer(Sema &SemaRef, |
| 4040 | CXXRecordDecl *ClassDecl, |
| 4041 | QualType BaseType, |
| 4042 | const CXXBaseSpecifier *&DirectBaseSpec, |
| 4043 | const CXXBaseSpecifier *&VirtualBaseSpec) { |
| 4044 | // First, check for a direct base class. |
| 4045 | DirectBaseSpec = nullptr; |
| 4046 | for (const auto &Base : ClassDecl->bases()) { |
| 4047 | if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base.getType())) { |
| 4048 | // We found a direct base of this type. That's what we're |
| 4049 | // initializing. |
| 4050 | DirectBaseSpec = &Base; |
| 4051 | break; |
| 4052 | } |
| 4053 | } |
| 4054 | |
| 4055 | // Check for a virtual base class. |
| 4056 | // FIXME: We might be able to short-circuit this if we know in advance that |
| 4057 | // there are no virtual bases. |
| 4058 | VirtualBaseSpec = nullptr; |
| 4059 | if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { |
| 4060 | // We haven't found a base yet; search the class hierarchy for a |
| 4061 | // virtual base class. |
| 4062 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
| 4063 | /*DetectVirtual=*/false); |
| 4064 | if (SemaRef.IsDerivedFrom(ClassDecl->getLocation(), |
| 4065 | SemaRef.Context.getTypeDeclType(ClassDecl), |
| 4066 | BaseType, Paths)) { |
| 4067 | for (CXXBasePaths::paths_iterator Path = Paths.begin(); |
| 4068 | Path != Paths.end(); ++Path) { |
| 4069 | if (Path->back().Base->isVirtual()) { |
| 4070 | VirtualBaseSpec = Path->back().Base; |
| 4071 | break; |
| 4072 | } |
| 4073 | } |
| 4074 | } |
| 4075 | } |
| 4076 | |
| 4077 | return DirectBaseSpec || VirtualBaseSpec; |
| 4078 | } |
| 4079 | |
| 4080 | /// Handle a C++ member initializer using braced-init-list syntax. |
| 4081 | MemInitResult |
| 4082 | Sema::ActOnMemInitializer(Decl *ConstructorD, |
| 4083 | Scope *S, |
| 4084 | CXXScopeSpec &SS, |
| 4085 | IdentifierInfo *MemberOrBase, |
| 4086 | ParsedType TemplateTypeTy, |
| 4087 | const DeclSpec &DS, |
| 4088 | SourceLocation IdLoc, |
| 4089 | Expr *InitList, |
| 4090 | SourceLocation EllipsisLoc) { |
| 4091 | return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, |
| 4092 | DS, IdLoc, InitList, |
| 4093 | EllipsisLoc); |
| 4094 | } |
| 4095 | |
| 4096 | /// Handle a C++ member initializer using parentheses syntax. |
| 4097 | MemInitResult |
| 4098 | Sema::ActOnMemInitializer(Decl *ConstructorD, |
| 4099 | Scope *S, |
| 4100 | CXXScopeSpec &SS, |
| 4101 | IdentifierInfo *MemberOrBase, |
| 4102 | ParsedType TemplateTypeTy, |
| 4103 | const DeclSpec &DS, |
| 4104 | SourceLocation IdLoc, |
| 4105 | SourceLocation LParenLoc, |
| 4106 | ArrayRef<Expr *> Args, |
| 4107 | SourceLocation RParenLoc, |
| 4108 | SourceLocation EllipsisLoc) { |
| 4109 | Expr *List = ParenListExpr::Create(Context, LParenLoc, Args, RParenLoc); |
| 4110 | return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, |
| 4111 | DS, IdLoc, List, EllipsisLoc); |
| 4112 | } |
| 4113 | |
| 4114 | namespace { |
| 4115 | |
| 4116 | // Callback to only accept typo corrections that can be a valid C++ member |
| 4117 | // intializer: either a non-static field member or a base class. |
| 4118 | class MemInitializerValidatorCCC final : public CorrectionCandidateCallback { |
| 4119 | public: |
| 4120 | explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) |
| 4121 | : ClassDecl(ClassDecl) {} |
| 4122 | |
| 4123 | bool ValidateCandidate(const TypoCorrection &candidate) override { |
| 4124 | if (NamedDecl *ND = candidate.getCorrectionDecl()) { |
| 4125 | if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) |
| 4126 | return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); |
| 4127 | return isa<TypeDecl>(ND); |
| 4128 | } |
| 4129 | return false; |
| 4130 | } |
| 4131 | |
| 4132 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
| 4133 | return std::make_unique<MemInitializerValidatorCCC>(*this); |
| 4134 | } |
| 4135 | |
| 4136 | private: |
| 4137 | CXXRecordDecl *ClassDecl; |
| 4138 | }; |
| 4139 | |
| 4140 | } |
| 4141 | |
| 4142 | ValueDecl *Sema::tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl, |
| 4143 | CXXScopeSpec &SS, |
| 4144 | ParsedType TemplateTypeTy, |
| 4145 | IdentifierInfo *MemberOrBase) { |
| 4146 | if (SS.getScopeRep() || TemplateTypeTy) |
| 4147 | return nullptr; |
| 4148 | for (auto *D : ClassDecl->lookup(MemberOrBase)) |
| 4149 | if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D)) |
| 4150 | return cast<ValueDecl>(D); |
| 4151 | return nullptr; |
| 4152 | } |
| 4153 | |
| 4154 | /// Handle a C++ member initializer. |
| 4155 | MemInitResult |
| 4156 | Sema::BuildMemInitializer(Decl *ConstructorD, |
| 4157 | Scope *S, |
| 4158 | CXXScopeSpec &SS, |
| 4159 | IdentifierInfo *MemberOrBase, |
| 4160 | ParsedType TemplateTypeTy, |
| 4161 | const DeclSpec &DS, |
| 4162 | SourceLocation IdLoc, |
| 4163 | Expr *Init, |
| 4164 | SourceLocation EllipsisLoc) { |
| 4165 | ExprResult Res = CorrectDelayedTyposInExpr(Init); |
| 4166 | if (!Res.isUsable()) |
| 4167 | return true; |
| 4168 | Init = Res.get(); |
| 4169 | |
| 4170 | if (!ConstructorD) |
| 4171 | return true; |
| 4172 | |
| 4173 | AdjustDeclIfTemplate(ConstructorD); |
| 4174 | |
| 4175 | CXXConstructorDecl *Constructor |
| 4176 | = dyn_cast<CXXConstructorDecl>(ConstructorD); |
| 4177 | if (!Constructor) { |
| 4178 | // The user wrote a constructor initializer on a function that is |
| 4179 | // not a C++ constructor. Ignore the error for now, because we may |
| 4180 | // have more member initializers coming; we'll diagnose it just |
| 4181 | // once in ActOnMemInitializers. |
| 4182 | return true; |
| 4183 | } |
| 4184 | |
| 4185 | CXXRecordDecl *ClassDecl = Constructor->getParent(); |
| 4186 | |
| 4187 | // C++ [class.base.init]p2: |
| 4188 | // Names in a mem-initializer-id are looked up in the scope of the |
| 4189 | // constructor's class and, if not found in that scope, are looked |
| 4190 | // up in the scope containing the constructor's definition. |
| 4191 | // [Note: if the constructor's class contains a member with the |
| 4192 | // same name as a direct or virtual base class of the class, a |
| 4193 | // mem-initializer-id naming the member or base class and composed |
| 4194 | // of a single identifier refers to the class member. A |
| 4195 | // mem-initializer-id for the hidden base class may be specified |
| 4196 | // using a qualified name. ] |
| 4197 | |
| 4198 | // Look for a member, first. |
| 4199 | if (ValueDecl *Member = tryLookupCtorInitMemberDecl( |
| 4200 | ClassDecl, SS, TemplateTypeTy, MemberOrBase)) { |
| 4201 | if (EllipsisLoc.isValid()) |
| 4202 | Diag(EllipsisLoc, diag::err_pack_expansion_member_init) |
| 4203 | << MemberOrBase |
| 4204 | << SourceRange(IdLoc, Init->getSourceRange().getEnd()); |
| 4205 | |
| 4206 | return BuildMemberInitializer(Member, Init, IdLoc); |
| 4207 | } |
| 4208 | // It didn't name a member, so see if it names a class. |
| 4209 | QualType BaseType; |
| 4210 | TypeSourceInfo *TInfo = nullptr; |
| 4211 | |
| 4212 | if (TemplateTypeTy) { |
| 4213 | BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); |
| 4214 | if (BaseType.isNull()) |
| 4215 | return true; |
| 4216 | } else if (DS.getTypeSpecType() == TST_decltype) { |
| 4217 | BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); |
| 4218 | } else if (DS.getTypeSpecType() == TST_decltype_auto) { |
| 4219 | Diag(DS.getTypeSpecTypeLoc(), diag::err_decltype_auto_invalid); |
| 4220 | return true; |
| 4221 | } else { |
| 4222 | LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); |
| 4223 | LookupParsedName(R, S, &SS); |
| 4224 | |
| 4225 | TypeDecl *TyD = R.getAsSingle<TypeDecl>(); |
| 4226 | if (!TyD) { |
| 4227 | if (R.isAmbiguous()) return true; |
| 4228 | |
| 4229 | // We don't want access-control diagnostics here. |
| 4230 | R.suppressDiagnostics(); |
| 4231 | |
| 4232 | if (SS.isSet() && isDependentScopeSpecifier(SS)) { |
| 4233 | bool NotUnknownSpecialization = false; |
| 4234 | DeclContext *DC = computeDeclContext(SS, false); |
| 4235 | if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) |
| 4236 | NotUnknownSpecialization = !Record->hasAnyDependentBases(); |
| 4237 | |
| 4238 | if (!NotUnknownSpecialization) { |
| 4239 | // When the scope specifier can refer to a member of an unknown |
| 4240 | // specialization, we take it as a type name. |
| 4241 | BaseType = CheckTypenameType(ETK_None, SourceLocation(), |
| 4242 | SS.getWithLocInContext(Context), |
| 4243 | *MemberOrBase, IdLoc); |
| 4244 | if (BaseType.isNull()) |
| 4245 | return true; |
| 4246 | |
| 4247 | TInfo = Context.CreateTypeSourceInfo(BaseType); |
| 4248 | DependentNameTypeLoc TL = |
| 4249 | TInfo->getTypeLoc().castAs<DependentNameTypeLoc>(); |
| 4250 | if (!TL.isNull()) { |
| 4251 | TL.setNameLoc(IdLoc); |
| 4252 | TL.setElaboratedKeywordLoc(SourceLocation()); |
| 4253 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| 4254 | } |
| 4255 | |
| 4256 | R.clear(); |
| 4257 | R.setLookupName(MemberOrBase); |
| 4258 | } |
| 4259 | } |
| 4260 | |
| 4261 | // If no results were found, try to correct typos. |
| 4262 | TypoCorrection Corr; |
| 4263 | MemInitializerValidatorCCC CCC(ClassDecl); |
| 4264 | if (R.empty() && BaseType.isNull() && |
| 4265 | (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, |
| 4266 | CCC, CTK_ErrorRecovery, ClassDecl))) { |
| 4267 | if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { |
| 4268 | // We have found a non-static data member with a similar |
| 4269 | // name to what was typed; complain and initialize that |
| 4270 | // member. |
| 4271 | diagnoseTypo(Corr, |
| 4272 | PDiag(diag::err_mem_init_not_member_or_class_suggest) |
| 4273 | << MemberOrBase << true); |
| 4274 | return BuildMemberInitializer(Member, Init, IdLoc); |
| 4275 | } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { |
| 4276 | const CXXBaseSpecifier *DirectBaseSpec; |
| 4277 | const CXXBaseSpecifier *VirtualBaseSpec; |
| 4278 | if (FindBaseInitializer(*this, ClassDecl, |
| 4279 | Context.getTypeDeclType(Type), |
| 4280 | DirectBaseSpec, VirtualBaseSpec)) { |
| 4281 | // We have found a direct or virtual base class with a |
| 4282 | // similar name to what was typed; complain and initialize |
| 4283 | // that base class. |
| 4284 | diagnoseTypo(Corr, |
| 4285 | PDiag(diag::err_mem_init_not_member_or_class_suggest) |
| 4286 | << MemberOrBase << false, |
| 4287 | PDiag() /*Suppress note, we provide our own.*/); |
| 4288 | |
| 4289 | const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec |
| 4290 | : VirtualBaseSpec; |
| 4291 | Diag(BaseSpec->getBeginLoc(), diag::note_base_class_specified_here) |
| 4292 | << BaseSpec->getType() << BaseSpec->getSourceRange(); |
| 4293 | |
| 4294 | TyD = Type; |
| 4295 | } |
| 4296 | } |
| 4297 | } |
| 4298 | |
| 4299 | if (!TyD && BaseType.isNull()) { |
| 4300 | Diag(IdLoc, diag::err_mem_init_not_member_or_class) |
| 4301 | << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); |
| 4302 | return true; |
| 4303 | } |
| 4304 | } |
| 4305 | |
| 4306 | if (BaseType.isNull()) { |
| 4307 | BaseType = Context.getTypeDeclType(TyD); |
| 4308 | MarkAnyDeclReferenced(TyD->getLocation(), TyD, /*OdrUse=*/false); |
| 4309 | if (SS.isSet()) { |
| 4310 | BaseType = Context.getElaboratedType(ETK_None, SS.getScopeRep(), |
| 4311 | BaseType); |
| 4312 | TInfo = Context.CreateTypeSourceInfo(BaseType); |
| 4313 | ElaboratedTypeLoc TL = TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>(); |
| 4314 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc); |
| 4315 | TL.setElaboratedKeywordLoc(SourceLocation()); |
| 4316 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| 4317 | } |
| 4318 | } |
| 4319 | } |
| 4320 | |
| 4321 | if (!TInfo) |
| 4322 | TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); |
| 4323 | |
| 4324 | return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); |
| 4325 | } |
| 4326 | |
| 4327 | MemInitResult |
| 4328 | Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, |
| 4329 | SourceLocation IdLoc) { |
| 4330 | FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); |
| 4331 | IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); |
| 4332 | assert((DirectMember || IndirectMember) &&((void)0) |
| 4333 | "Member must be a FieldDecl or IndirectFieldDecl")((void)0); |
| 4334 | |
| 4335 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) |
| 4336 | return true; |
| 4337 | |
| 4338 | if (Member->isInvalidDecl()) |
| 4339 | return true; |
| 4340 | |
| 4341 | MultiExprArg Args; |
| 4342 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { |
| 4343 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); |
| 4344 | } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { |
| 4345 | Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); |
| 4346 | } else { |
| 4347 | // Template instantiation doesn't reconstruct ParenListExprs for us. |
| 4348 | Args = Init; |
| 4349 | } |
| 4350 | |
| 4351 | SourceRange InitRange = Init->getSourceRange(); |
| 4352 | |
| 4353 | if (Member->getType()->isDependentType() || Init->isTypeDependent()) { |
| 4354 | // Can't check initialization for a member of dependent type or when |
| 4355 | // any of the arguments are type-dependent expressions. |
| 4356 | DiscardCleanupsInEvaluationContext(); |
| 4357 | } else { |
| 4358 | bool InitList = false; |
| 4359 | if (isa<InitListExpr>(Init)) { |
| 4360 | InitList = true; |
| 4361 | Args = Init; |
| 4362 | } |
| 4363 | |
| 4364 | // Initialize the member. |
| 4365 | InitializedEntity MemberEntity = |
| 4366 | DirectMember ? InitializedEntity::InitializeMember(DirectMember, nullptr) |
| 4367 | : InitializedEntity::InitializeMember(IndirectMember, |
| 4368 | nullptr); |
| 4369 | InitializationKind Kind = |
| 4370 | InitList ? InitializationKind::CreateDirectList( |
| 4371 | IdLoc, Init->getBeginLoc(), Init->getEndLoc()) |
| 4372 | : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), |
| 4373 | InitRange.getEnd()); |
| 4374 | |
| 4375 | InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); |
| 4376 | ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, |
| 4377 | nullptr); |
| 4378 | if (MemberInit.isInvalid()) |
| 4379 | return true; |
| 4380 | |
| 4381 | // C++11 [class.base.init]p7: |
| 4382 | // The initialization of each base and member constitutes a |
| 4383 | // full-expression. |
| 4384 | MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin(), |
| 4385 | /*DiscardedValue*/ false); |
| 4386 | if (MemberInit.isInvalid()) |
| 4387 | return true; |
| 4388 | |
| 4389 | Init = MemberInit.get(); |
| 4390 | } |
| 4391 | |
| 4392 | if (DirectMember) { |
| 4393 | return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, |
| 4394 | InitRange.getBegin(), Init, |
| 4395 | InitRange.getEnd()); |
| 4396 | } else { |
| 4397 | return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, |
| 4398 | InitRange.getBegin(), Init, |
| 4399 | InitRange.getEnd()); |
| 4400 | } |
| 4401 | } |
| 4402 | |
| 4403 | MemInitResult |
| 4404 | Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, |
| 4405 | CXXRecordDecl *ClassDecl) { |
| 4406 | SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); |
| 4407 | if (!LangOpts.CPlusPlus11) |
| 4408 | return Diag(NameLoc, diag::err_delegating_ctor) |
| 4409 | << TInfo->getTypeLoc().getLocalSourceRange(); |
| 4410 | Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); |
| 4411 | |
| 4412 | bool InitList = true; |
| 4413 | MultiExprArg Args = Init; |
| 4414 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { |
| 4415 | InitList = false; |
| 4416 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); |
| 4417 | } |
| 4418 | |
| 4419 | SourceRange InitRange = Init->getSourceRange(); |
| 4420 | // Initialize the object. |
| 4421 | InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( |
| 4422 | QualType(ClassDecl->getTypeForDecl(), 0)); |
| 4423 | InitializationKind Kind = |
| 4424 | InitList ? InitializationKind::CreateDirectList( |
| 4425 | NameLoc, Init->getBeginLoc(), Init->getEndLoc()) |
| 4426 | : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), |
| 4427 | InitRange.getEnd()); |
| 4428 | InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); |
| 4429 | ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, |
| 4430 | Args, nullptr); |
| 4431 | if (DelegationInit.isInvalid()) |
| 4432 | return true; |
| 4433 | |
| 4434 | assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&((void)0) |
| 4435 | "Delegating constructor with no target?")((void)0); |
| 4436 | |
| 4437 | // C++11 [class.base.init]p7: |
| 4438 | // The initialization of each base and member constitutes a |
| 4439 | // full-expression. |
| 4440 | DelegationInit = ActOnFinishFullExpr( |
| 4441 | DelegationInit.get(), InitRange.getBegin(), /*DiscardedValue*/ false); |
| 4442 | if (DelegationInit.isInvalid()) |
| 4443 | return true; |
| 4444 | |
| 4445 | // If we are in a dependent context, template instantiation will |
| 4446 | // perform this type-checking again. Just save the arguments that we |
| 4447 | // received in a ParenListExpr. |
| 4448 | // FIXME: This isn't quite ideal, since our ASTs don't capture all |
| 4449 | // of the information that we have about the base |
| 4450 | // initializer. However, deconstructing the ASTs is a dicey process, |
| 4451 | // and this approach is far more likely to get the corner cases right. |
| 4452 | if (CurContext->isDependentContext()) |
| 4453 | DelegationInit = Init; |
| 4454 | |
| 4455 | return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), |
| 4456 | DelegationInit.getAs<Expr>(), |
| 4457 | InitRange.getEnd()); |
| 4458 | } |
| 4459 | |
| 4460 | MemInitResult |
| 4461 | Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, |
| 4462 | Expr *Init, CXXRecordDecl *ClassDecl, |
| 4463 | SourceLocation EllipsisLoc) { |
| 4464 | SourceLocation BaseLoc |
| 4465 | = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); |
| 4466 | |
| 4467 | if (!BaseType->isDependentType() && !BaseType->isRecordType()) |
| 4468 | return Diag(BaseLoc, diag::err_base_init_does_not_name_class) |
| 4469 | << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); |
| 4470 | |
| 4471 | // C++ [class.base.init]p2: |
| 4472 | // [...] Unless the mem-initializer-id names a nonstatic data |
| 4473 | // member of the constructor's class or a direct or virtual base |
| 4474 | // of that class, the mem-initializer is ill-formed. A |
| 4475 | // mem-initializer-list can initialize a base class using any |
| 4476 | // name that denotes that base class type. |
| 4477 | bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); |
| 4478 | |
| 4479 | SourceRange InitRange = Init->getSourceRange(); |
| 4480 | if (EllipsisLoc.isValid()) { |
| 4481 | // This is a pack expansion. |
| 4482 | if (!BaseType->containsUnexpandedParameterPack()) { |
| 4483 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) |
| 4484 | << SourceRange(BaseLoc, InitRange.getEnd()); |
| 4485 | |
| 4486 | EllipsisLoc = SourceLocation(); |
| 4487 | } |
| 4488 | } else { |
| 4489 | // Check for any unexpanded parameter packs. |
| 4490 | if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) |
| 4491 | return true; |
| 4492 | |
| 4493 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) |
| 4494 | return true; |
| 4495 | } |
| 4496 | |
| 4497 | // Check for direct and virtual base classes. |
| 4498 | const CXXBaseSpecifier *DirectBaseSpec = nullptr; |
| 4499 | const CXXBaseSpecifier *VirtualBaseSpec = nullptr; |
| 4500 | if (!Dependent) { |
| 4501 | if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), |
| 4502 | BaseType)) |
| 4503 | return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); |
| 4504 | |
| 4505 | FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, |
| 4506 | VirtualBaseSpec); |
| 4507 | |
| 4508 | // C++ [base.class.init]p2: |
| 4509 | // Unless the mem-initializer-id names a nonstatic data member of the |
| 4510 | // constructor's class or a direct or virtual base of that class, the |
| 4511 | // mem-initializer is ill-formed. |
| 4512 | if (!DirectBaseSpec && !VirtualBaseSpec) { |
| 4513 | // If the class has any dependent bases, then it's possible that |
| 4514 | // one of those types will resolve to the same type as |
| 4515 | // BaseType. Therefore, just treat this as a dependent base |
| 4516 | // class initialization. FIXME: Should we try to check the |
| 4517 | // initialization anyway? It seems odd. |
| 4518 | if (ClassDecl->hasAnyDependentBases()) |
| 4519 | Dependent = true; |
| 4520 | else |
| 4521 | return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) |
| 4522 | << BaseType << Context.getTypeDeclType(ClassDecl) |
| 4523 | << BaseTInfo->getTypeLoc().getLocalSourceRange(); |
| 4524 | } |
| 4525 | } |
| 4526 | |
| 4527 | if (Dependent) { |
| 4528 | DiscardCleanupsInEvaluationContext(); |
| 4529 | |
| 4530 | return new (Context) CXXCtorInitializer(Context, BaseTInfo, |
| 4531 | /*IsVirtual=*/false, |
| 4532 | InitRange.getBegin(), Init, |
| 4533 | InitRange.getEnd(), EllipsisLoc); |
| 4534 | } |
| 4535 | |
| 4536 | // C++ [base.class.init]p2: |
| 4537 | // If a mem-initializer-id is ambiguous because it designates both |
| 4538 | // a direct non-virtual base class and an inherited virtual base |
| 4539 | // class, the mem-initializer is ill-formed. |
| 4540 | if (DirectBaseSpec && VirtualBaseSpec) |
| 4541 | return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) |
| 4542 | << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); |
| 4543 | |
| 4544 | const CXXBaseSpecifier *BaseSpec = DirectBaseSpec; |
| 4545 | if (!BaseSpec) |
| 4546 | BaseSpec = VirtualBaseSpec; |
| 4547 | |
| 4548 | // Initialize the base. |
| 4549 | bool InitList = true; |
| 4550 | MultiExprArg Args = Init; |
| 4551 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { |
| 4552 | InitList = false; |
| 4553 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); |
| 4554 | } |
| 4555 | |
| 4556 | InitializedEntity BaseEntity = |
| 4557 | InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); |
| 4558 | InitializationKind Kind = |
| 4559 | InitList ? InitializationKind::CreateDirectList(BaseLoc) |
| 4560 | : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), |
| 4561 | InitRange.getEnd()); |
| 4562 | InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); |
| 4563 | ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, nullptr); |
| 4564 | if (BaseInit.isInvalid()) |
| 4565 | return true; |
| 4566 | |
| 4567 | // C++11 [class.base.init]p7: |
| 4568 | // The initialization of each base and member constitutes a |
| 4569 | // full-expression. |
| 4570 | BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin(), |
| 4571 | /*DiscardedValue*/ false); |
| 4572 | if (BaseInit.isInvalid()) |
| 4573 | return true; |
| 4574 | |
| 4575 | // If we are in a dependent context, template instantiation will |
| 4576 | // perform this type-checking again. Just save the arguments that we |
| 4577 | // received in a ParenListExpr. |
| 4578 | // FIXME: This isn't quite ideal, since our ASTs don't capture all |
| 4579 | // of the information that we have about the base |
| 4580 | // initializer. However, deconstructing the ASTs is a dicey process, |
| 4581 | // and this approach is far more likely to get the corner cases right. |
| 4582 | if (CurContext->isDependentContext()) |
| 4583 | BaseInit = Init; |
| 4584 | |
| 4585 | return new (Context) CXXCtorInitializer(Context, BaseTInfo, |
| 4586 | BaseSpec->isVirtual(), |
| 4587 | InitRange.getBegin(), |
| 4588 | BaseInit.getAs<Expr>(), |
| 4589 | InitRange.getEnd(), EllipsisLoc); |
| 4590 | } |
| 4591 | |
| 4592 | // Create a static_cast\<T&&>(expr). |
| 4593 | static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { |
| 4594 | if (T.isNull()) T = E->getType(); |
| 4595 | QualType TargetType = SemaRef.BuildReferenceType( |
| 4596 | T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); |
| 4597 | SourceLocation ExprLoc = E->getBeginLoc(); |
| 4598 | TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( |
| 4599 | TargetType, ExprLoc); |
| 4600 | |
| 4601 | return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, |
| 4602 | SourceRange(ExprLoc, ExprLoc), |
| 4603 | E->getSourceRange()).get(); |
| 4604 | } |
| 4605 | |
| 4606 | /// ImplicitInitializerKind - How an implicit base or member initializer should |
| 4607 | /// initialize its base or member. |
| 4608 | enum ImplicitInitializerKind { |
| 4609 | IIK_Default, |
| 4610 | IIK_Copy, |
| 4611 | IIK_Move, |
| 4612 | IIK_Inherit |
| 4613 | }; |
| 4614 | |
| 4615 | static bool |
| 4616 | BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, |
| 4617 | ImplicitInitializerKind ImplicitInitKind, |
| 4618 | CXXBaseSpecifier *BaseSpec, |
| 4619 | bool IsInheritedVirtualBase, |
| 4620 | CXXCtorInitializer *&CXXBaseInit) { |
| 4621 | InitializedEntity InitEntity |
| 4622 | = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, |
| 4623 | IsInheritedVirtualBase); |
| 4624 | |
| 4625 | ExprResult BaseInit; |
| 4626 | |
| 4627 | switch (ImplicitInitKind) { |
| 4628 | case IIK_Inherit: |
| 4629 | case IIK_Default: { |
| 4630 | InitializationKind InitKind |
| 4631 | = InitializationKind::CreateDefault(Constructor->getLocation()); |
| 4632 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); |
| 4633 | BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); |
| 4634 | break; |
| 4635 | } |
| 4636 | |
| 4637 | case IIK_Move: |
| 4638 | case IIK_Copy: { |
| 4639 | bool Moving = ImplicitInitKind == IIK_Move; |
| 4640 | ParmVarDecl *Param = Constructor->getParamDecl(0); |
| 4641 | QualType ParamType = Param->getType().getNonReferenceType(); |
| 4642 | |
| 4643 | Expr *CopyCtorArg = |
| 4644 | DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), |
| 4645 | SourceLocation(), Param, false, |
| 4646 | Constructor->getLocation(), ParamType, |
| 4647 | VK_LValue, nullptr); |
| 4648 | |
| 4649 | SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); |
| 4650 | |
| 4651 | // Cast to the base class to avoid ambiguities. |
| 4652 | QualType ArgTy = |
| 4653 | SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), |
| 4654 | ParamType.getQualifiers()); |
| 4655 | |
| 4656 | if (Moving) { |
| 4657 | CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); |
| 4658 | } |
| 4659 | |
| 4660 | CXXCastPath BasePath; |
| 4661 | BasePath.push_back(BaseSpec); |
| 4662 | CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, |
| 4663 | CK_UncheckedDerivedToBase, |
| 4664 | Moving ? VK_XValue : VK_LValue, |
| 4665 | &BasePath).get(); |
| 4666 | |
| 4667 | InitializationKind InitKind |
| 4668 | = InitializationKind::CreateDirect(Constructor->getLocation(), |
| 4669 | SourceLocation(), SourceLocation()); |
| 4670 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); |
| 4671 | BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); |
| 4672 | break; |
| 4673 | } |
| 4674 | } |
| 4675 | |
| 4676 | BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); |
| 4677 | if (BaseInit.isInvalid()) |
| 4678 | return true; |
| 4679 | |
| 4680 | CXXBaseInit = |
| 4681 | new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, |
| 4682 | SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), |
| 4683 | SourceLocation()), |
| 4684 | BaseSpec->isVirtual(), |
| 4685 | SourceLocation(), |
| 4686 | BaseInit.getAs<Expr>(), |
| 4687 | SourceLocation(), |
| 4688 | SourceLocation()); |
| 4689 | |
| 4690 | return false; |
| 4691 | } |
| 4692 | |
| 4693 | static bool RefersToRValueRef(Expr *MemRef) { |
| 4694 | ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); |
| 4695 | return Referenced->getType()->isRValueReferenceType(); |
| 4696 | } |
| 4697 | |
| 4698 | static bool |
| 4699 | BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, |
| 4700 | ImplicitInitializerKind ImplicitInitKind, |
| 4701 | FieldDecl *Field, IndirectFieldDecl *Indirect, |
| 4702 | CXXCtorInitializer *&CXXMemberInit) { |
| 4703 | if (Field->isInvalidDecl()) |
| 4704 | return true; |
| 4705 | |
| 4706 | SourceLocation Loc = Constructor->getLocation(); |
| 4707 | |
| 4708 | if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { |
| 4709 | bool Moving = ImplicitInitKind == IIK_Move; |
| 4710 | ParmVarDecl *Param = Constructor->getParamDecl(0); |
| 4711 | QualType ParamType = Param->getType().getNonReferenceType(); |
| 4712 | |
| 4713 | // Suppress copying zero-width bitfields. |
| 4714 | if (Field->isZeroLengthBitField(SemaRef.Context)) |
| 4715 | return false; |
| 4716 | |
| 4717 | Expr *MemberExprBase = |
| 4718 | DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), |
| 4719 | SourceLocation(), Param, false, |
| 4720 | Loc, ParamType, VK_LValue, nullptr); |
| 4721 | |
| 4722 | SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); |
| 4723 | |
| 4724 | if (Moving) { |
| 4725 | MemberExprBase = CastForMoving(SemaRef, MemberExprBase); |
| 4726 | } |
| 4727 | |
| 4728 | // Build a reference to this field within the parameter. |
| 4729 | CXXScopeSpec SS; |
| 4730 | LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, |
| 4731 | Sema::LookupMemberName); |
| 4732 | MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) |
| 4733 | : cast<ValueDecl>(Field), AS_public); |
| 4734 | MemberLookup.resolveKind(); |
| 4735 | ExprResult CtorArg |
| 4736 | = SemaRef.BuildMemberReferenceExpr(MemberExprBase, |
| 4737 | ParamType, Loc, |
| 4738 | /*IsArrow=*/false, |
| 4739 | SS, |
| 4740 | /*TemplateKWLoc=*/SourceLocation(), |
| 4741 | /*FirstQualifierInScope=*/nullptr, |
| 4742 | MemberLookup, |
| 4743 | /*TemplateArgs=*/nullptr, |
| 4744 | /*S*/nullptr); |
| 4745 | if (CtorArg.isInvalid()) |
| 4746 | return true; |
| 4747 | |
| 4748 | // C++11 [class.copy]p15: |
| 4749 | // - if a member m has rvalue reference type T&&, it is direct-initialized |
| 4750 | // with static_cast<T&&>(x.m); |
| 4751 | if (RefersToRValueRef(CtorArg.get())) { |
| 4752 | CtorArg = CastForMoving(SemaRef, CtorArg.get()); |
| 4753 | } |
| 4754 | |
| 4755 | InitializedEntity Entity = |
| 4756 | Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr, |
| 4757 | /*Implicit*/ true) |
| 4758 | : InitializedEntity::InitializeMember(Field, nullptr, |
| 4759 | /*Implicit*/ true); |
| 4760 | |
| 4761 | // Direct-initialize to use the copy constructor. |
| 4762 | InitializationKind InitKind = |
| 4763 | InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); |
| 4764 | |
| 4765 | Expr *CtorArgE = CtorArg.getAs<Expr>(); |
| 4766 | InitializationSequence InitSeq(SemaRef, Entity, InitKind, CtorArgE); |
| 4767 | ExprResult MemberInit = |
| 4768 | InitSeq.Perform(SemaRef, Entity, InitKind, MultiExprArg(&CtorArgE, 1)); |
| 4769 | MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); |
| 4770 | if (MemberInit.isInvalid()) |
| 4771 | return true; |
| 4772 | |
| 4773 | if (Indirect) |
| 4774 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer( |
| 4775 | SemaRef.Context, Indirect, Loc, Loc, MemberInit.getAs<Expr>(), Loc); |
| 4776 | else |
| 4777 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer( |
| 4778 | SemaRef.Context, Field, Loc, Loc, MemberInit.getAs<Expr>(), Loc); |
| 4779 | return false; |
| 4780 | } |
| 4781 | |
| 4782 | assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) &&((void)0) |
| 4783 | "Unhandled implicit init kind!")((void)0); |
| 4784 | |
| 4785 | QualType FieldBaseElementType = |
| 4786 | SemaRef.Context.getBaseElementType(Field->getType()); |
| 4787 | |
| 4788 | if (FieldBaseElementType->isRecordType()) { |
| 4789 | InitializedEntity InitEntity = |
| 4790 | Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr, |
| 4791 | /*Implicit*/ true) |
| 4792 | : InitializedEntity::InitializeMember(Field, nullptr, |
| 4793 | /*Implicit*/ true); |
| 4794 | InitializationKind InitKind = |
| 4795 | InitializationKind::CreateDefault(Loc); |
| 4796 | |
| 4797 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); |
| 4798 | ExprResult MemberInit = |
| 4799 | InitSeq.Perform(SemaRef, InitEntity, InitKind, None); |
| 4800 | |
| 4801 | MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); |
| 4802 | if (MemberInit.isInvalid()) |
| 4803 | return true; |
| 4804 | |
| 4805 | if (Indirect) |
| 4806 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, |
| 4807 | Indirect, Loc, |
| 4808 | Loc, |
| 4809 | MemberInit.get(), |
| 4810 | Loc); |
| 4811 | else |
| 4812 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, |
| 4813 | Field, Loc, Loc, |
| 4814 | MemberInit.get(), |
| 4815 | Loc); |
| 4816 | return false; |
| 4817 | } |
| 4818 | |
| 4819 | if (!Field->getParent()->isUnion()) { |
| 4820 | if (FieldBaseElementType->isReferenceType()) { |
| 4821 | SemaRef.Diag(Constructor->getLocation(), |
| 4822 | diag::err_uninitialized_member_in_ctor) |
| 4823 | << (int)Constructor->isImplicit() |
| 4824 | << SemaRef.Context.getTagDeclType(Constructor->getParent()) |
| 4825 | << 0 << Field->getDeclName(); |
| 4826 | SemaRef.Diag(Field->getLocation(), diag::note_declared_at); |
| 4827 | return true; |
| 4828 | } |
| 4829 | |
| 4830 | if (FieldBaseElementType.isConstQualified()) { |
| 4831 | SemaRef.Diag(Constructor->getLocation(), |
| 4832 | diag::err_uninitialized_member_in_ctor) |
| 4833 | << (int)Constructor->isImplicit() |
| 4834 | << SemaRef.Context.getTagDeclType(Constructor->getParent()) |
| 4835 | << 1 << Field->getDeclName(); |
| 4836 | SemaRef.Diag(Field->getLocation(), diag::note_declared_at); |
| 4837 | return true; |
| 4838 | } |
| 4839 | } |
| 4840 | |
| 4841 | if (FieldBaseElementType.hasNonTrivialObjCLifetime()) { |
| 4842 | // ARC and Weak: |
| 4843 | // Default-initialize Objective-C pointers to NULL. |
| 4844 | CXXMemberInit |
| 4845 | = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, |
| 4846 | Loc, Loc, |
| 4847 | new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), |
| 4848 | Loc); |
| 4849 | return false; |
| 4850 | } |
| 4851 | |
| 4852 | // Nothing to initialize. |
| 4853 | CXXMemberInit = nullptr; |
| 4854 | return false; |
| 4855 | } |
| 4856 | |
| 4857 | namespace { |
| 4858 | struct BaseAndFieldInfo { |
| 4859 | Sema &S; |
| 4860 | CXXConstructorDecl *Ctor; |
| 4861 | bool AnyErrorsInInits; |
| 4862 | ImplicitInitializerKind IIK; |
| 4863 | llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; |
| 4864 | SmallVector<CXXCtorInitializer*, 8> AllToInit; |
| 4865 | llvm::DenseMap<TagDecl*, FieldDecl*> ActiveUnionMember; |
| 4866 | |
| 4867 | BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) |
| 4868 | : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { |
| 4869 | bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); |
| 4870 | if (Ctor->getInheritedConstructor()) |
| 4871 | IIK = IIK_Inherit; |
| 4872 | else if (Generated && Ctor->isCopyConstructor()) |
| 4873 | IIK = IIK_Copy; |
| 4874 | else if (Generated && Ctor->isMoveConstructor()) |
| 4875 | IIK = IIK_Move; |
| 4876 | else |
| 4877 | IIK = IIK_Default; |
| 4878 | } |
| 4879 | |
| 4880 | bool isImplicitCopyOrMove() const { |
| 4881 | switch (IIK) { |
| 4882 | case IIK_Copy: |
| 4883 | case IIK_Move: |
| 4884 | return true; |
| 4885 | |
| 4886 | case IIK_Default: |
| 4887 | case IIK_Inherit: |
| 4888 | return false; |
| 4889 | } |
| 4890 | |
| 4891 | llvm_unreachable("Invalid ImplicitInitializerKind!")__builtin_unreachable(); |
| 4892 | } |
| 4893 | |
| 4894 | bool addFieldInitializer(CXXCtorInitializer *Init) { |
| 4895 | AllToInit.push_back(Init); |
| 4896 | |
| 4897 | // Check whether this initializer makes the field "used". |
| 4898 | if (Init->getInit()->HasSideEffects(S.Context)) |
| 4899 | S.UnusedPrivateFields.remove(Init->getAnyMember()); |
| 4900 | |
| 4901 | return false; |
| 4902 | } |
| 4903 | |
| 4904 | bool isInactiveUnionMember(FieldDecl *Field) { |
| 4905 | RecordDecl *Record = Field->getParent(); |
| 4906 | if (!Record->isUnion()) |
| 4907 | return false; |
| 4908 | |
| 4909 | if (FieldDecl *Active = |
| 4910 | ActiveUnionMember.lookup(Record->getCanonicalDecl())) |
| 4911 | return Active != Field->getCanonicalDecl(); |
| 4912 | |
| 4913 | // In an implicit copy or move constructor, ignore any in-class initializer. |
| 4914 | if (isImplicitCopyOrMove()) |
| 4915 | return true; |
| 4916 | |
| 4917 | // If there's no explicit initialization, the field is active only if it |
| 4918 | // has an in-class initializer... |
| 4919 | if (Field->hasInClassInitializer()) |
| 4920 | return false; |
| 4921 | // ... or it's an anonymous struct or union whose class has an in-class |
| 4922 | // initializer. |
| 4923 | if (!Field->isAnonymousStructOrUnion()) |
| 4924 | return true; |
| 4925 | CXXRecordDecl *FieldRD = Field->getType()->getAsCXXRecordDecl(); |
| 4926 | return !FieldRD->hasInClassInitializer(); |
| 4927 | } |
| 4928 | |
| 4929 | /// Determine whether the given field is, or is within, a union member |
| 4930 | /// that is inactive (because there was an initializer given for a different |
| 4931 | /// member of the union, or because the union was not initialized at all). |
| 4932 | bool isWithinInactiveUnionMember(FieldDecl *Field, |
| 4933 | IndirectFieldDecl *Indirect) { |
| 4934 | if (!Indirect) |
| 4935 | return isInactiveUnionMember(Field); |
| 4936 | |
| 4937 | for (auto *C : Indirect->chain()) { |
| 4938 | FieldDecl *Field = dyn_cast<FieldDecl>(C); |
| 4939 | if (Field && isInactiveUnionMember(Field)) |
| 4940 | return true; |
| 4941 | } |
| 4942 | return false; |
| 4943 | } |
| 4944 | }; |
| 4945 | } |
| 4946 | |
| 4947 | /// Determine whether the given type is an incomplete or zero-lenfgth |
| 4948 | /// array type. |
| 4949 | static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { |
| 4950 | if (T->isIncompleteArrayType()) |
| 4951 | return true; |
| 4952 | |
| 4953 | while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { |
| 4954 | if (!ArrayT->getSize()) |
| 4955 | return true; |
| 4956 | |
| 4957 | T = ArrayT->getElementType(); |
| 4958 | } |
| 4959 | |
| 4960 | return false; |
| 4961 | } |
| 4962 | |
| 4963 | static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, |
| 4964 | FieldDecl *Field, |
| 4965 | IndirectFieldDecl *Indirect = nullptr) { |
| 4966 | if (Field->isInvalidDecl()) |
| 4967 | return false; |
| 4968 | |
| 4969 | // Overwhelmingly common case: we have a direct initializer for this field. |
| 4970 | if (CXXCtorInitializer *Init = |
| 4971 | Info.AllBaseFields.lookup(Field->getCanonicalDecl())) |
| 4972 | return Info.addFieldInitializer(Init); |
| 4973 | |
| 4974 | // C++11 [class.base.init]p8: |
| 4975 | // if the entity is a non-static data member that has a |
| 4976 | // brace-or-equal-initializer and either |
| 4977 | // -- the constructor's class is a union and no other variant member of that |
| 4978 | // union is designated by a mem-initializer-id or |
| 4979 | // -- the constructor's class is not a union, and, if the entity is a member |
| 4980 | // of an anonymous union, no other member of that union is designated by |
| 4981 | // a mem-initializer-id, |
| 4982 | // the entity is initialized as specified in [dcl.init]. |
| 4983 | // |
| 4984 | // We also apply the same rules to handle anonymous structs within anonymous |
| 4985 | // unions. |
| 4986 | if (Info.isWithinInactiveUnionMember(Field, Indirect)) |
| 4987 | return false; |
| 4988 | |
| 4989 | if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { |
| 4990 | ExprResult DIE = |
| 4991 | SemaRef.BuildCXXDefaultInitExpr(Info.Ctor->getLocation(), Field); |
| 4992 | if (DIE.isInvalid()) |
| 4993 | return true; |
| 4994 | |
| 4995 | auto Entity = InitializedEntity::InitializeMember(Field, nullptr, true); |
| 4996 | SemaRef.checkInitializerLifetime(Entity, DIE.get()); |
| 4997 | |
| 4998 | CXXCtorInitializer *Init; |
| 4999 | if (Indirect) |
| 5000 | Init = new (SemaRef.Context) |
| 5001 | CXXCtorInitializer(SemaRef.Context, Indirect, SourceLocation(), |
| 5002 | SourceLocation(), DIE.get(), SourceLocation()); |
| 5003 | else |
| 5004 | Init = new (SemaRef.Context) |
| 5005 | CXXCtorInitializer(SemaRef.Context, Field, SourceLocation(), |
| 5006 | SourceLocation(), DIE.get(), SourceLocation()); |
| 5007 | return Info.addFieldInitializer(Init); |
| 5008 | } |
| 5009 | |
| 5010 | // Don't initialize incomplete or zero-length arrays. |
| 5011 | if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) |
| 5012 | return false; |
| 5013 | |
| 5014 | // Don't try to build an implicit initializer if there were semantic |
| 5015 | // errors in any of the initializers (and therefore we might be |
| 5016 | // missing some that the user actually wrote). |
| 5017 | if (Info.AnyErrorsInInits) |
| 5018 | return false; |
| 5019 | |
| 5020 | CXXCtorInitializer *Init = nullptr; |
| 5021 | if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, |
| 5022 | Indirect, Init)) |
| 5023 | return true; |
| 5024 | |
| 5025 | if (!Init) |
| 5026 | return false; |
| 5027 | |
| 5028 | return Info.addFieldInitializer(Init); |
| 5029 | } |
| 5030 | |
| 5031 | bool |
| 5032 | Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, |
| 5033 | CXXCtorInitializer *Initializer) { |
| 5034 | assert(Initializer->isDelegatingInitializer())((void)0); |
| 5035 | Constructor->setNumCtorInitializers(1); |
| 5036 | CXXCtorInitializer **initializer = |
| 5037 | new (Context) CXXCtorInitializer*[1]; |
| 5038 | memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); |
| 5039 | Constructor->setCtorInitializers(initializer); |
| 5040 | |
| 5041 | if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { |
| 5042 | MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); |
| 5043 | DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); |
| 5044 | } |
| 5045 | |
| 5046 | DelegatingCtorDecls.push_back(Constructor); |
| 5047 | |
| 5048 | DiagnoseUninitializedFields(*this, Constructor); |
| 5049 | |
| 5050 | return false; |
| 5051 | } |
| 5052 | |
| 5053 | bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, |
| 5054 | ArrayRef<CXXCtorInitializer *> Initializers) { |
| 5055 | if (Constructor->isDependentContext()) { |
| 5056 | // Just store the initializers as written, they will be checked during |
| 5057 | // instantiation. |
| 5058 | if (!Initializers.empty()) { |
| 5059 | Constructor->setNumCtorInitializers(Initializers.size()); |
| 5060 | CXXCtorInitializer **baseOrMemberInitializers = |
| 5061 | new (Context) CXXCtorInitializer*[Initializers.size()]; |
| 5062 | memcpy(baseOrMemberInitializers, Initializers.data(), |
| 5063 | Initializers.size() * sizeof(CXXCtorInitializer*)); |
| 5064 | Constructor->setCtorInitializers(baseOrMemberInitializers); |
| 5065 | } |
| 5066 | |
| 5067 | // Let template instantiation know whether we had errors. |
| 5068 | if (AnyErrors) |
| 5069 | Constructor->setInvalidDecl(); |
| 5070 | |
| 5071 | return false; |
| 5072 | } |
| 5073 | |
| 5074 | BaseAndFieldInfo Info(*this, Constructor, AnyErrors); |
| 5075 | |
| 5076 | // We need to build the initializer AST according to order of construction |
| 5077 | // and not what user specified in the Initializers list. |
| 5078 | CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); |
| 5079 | if (!ClassDecl) |
| 5080 | return true; |
| 5081 | |
| 5082 | bool HadError = false; |
| 5083 | |
| 5084 | for (unsigned i = 0; i < Initializers.size(); i++) { |
| 5085 | CXXCtorInitializer *Member = Initializers[i]; |
| 5086 | |
| 5087 | if (Member->isBaseInitializer()) |
| 5088 | Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; |
| 5089 | else { |
| 5090 | Info.AllBaseFields[Member->getAnyMember()->getCanonicalDecl()] = Member; |
| 5091 | |
| 5092 | if (IndirectFieldDecl *F = Member->getIndirectMember()) { |
| 5093 | for (auto *C : F->chain()) { |
| 5094 | FieldDecl *FD = dyn_cast<FieldDecl>(C); |
| 5095 | if (FD && FD->getParent()->isUnion()) |
| 5096 | Info.ActiveUnionMember.insert(std::make_pair( |
| 5097 | FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl())); |
| 5098 | } |
| 5099 | } else if (FieldDecl *FD = Member->getMember()) { |
| 5100 | if (FD->getParent()->isUnion()) |
| 5101 | Info.ActiveUnionMember.insert(std::make_pair( |
| 5102 | FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl())); |
| 5103 | } |
| 5104 | } |
| 5105 | } |
| 5106 | |
| 5107 | // Keep track of the direct virtual bases. |
| 5108 | llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; |
| 5109 | for (auto &I : ClassDecl->bases()) { |
| 5110 | if (I.isVirtual()) |
| 5111 | DirectVBases.insert(&I); |
| 5112 | } |
| 5113 | |
| 5114 | // Push virtual bases before others. |
| 5115 | for (auto &VBase : ClassDecl->vbases()) { |
| 5116 | if (CXXCtorInitializer *Value |
| 5117 | = Info.AllBaseFields.lookup(VBase.getType()->getAs<RecordType>())) { |
| 5118 | // [class.base.init]p7, per DR257: |
| 5119 | // A mem-initializer where the mem-initializer-id names a virtual base |
| 5120 | // class is ignored during execution of a constructor of any class that |
| 5121 | // is not the most derived class. |
| 5122 | if (ClassDecl->isAbstract()) { |
| 5123 | // FIXME: Provide a fixit to remove the base specifier. This requires |
| 5124 | // tracking the location of the associated comma for a base specifier. |
| 5125 | Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored) |
| 5126 | << VBase.getType() << ClassDecl; |
| 5127 | DiagnoseAbstractType(ClassDecl); |
| 5128 | } |
| 5129 | |
| 5130 | Info.AllToInit.push_back(Value); |
| 5131 | } else if (!AnyErrors && !ClassDecl->isAbstract()) { |
| 5132 | // [class.base.init]p8, per DR257: |
| 5133 | // If a given [...] base class is not named by a mem-initializer-id |
| 5134 | // [...] and the entity is not a virtual base class of an abstract |
| 5135 | // class, then [...] the entity is default-initialized. |
| 5136 | bool IsInheritedVirtualBase = !DirectVBases.count(&VBase); |
| 5137 | CXXCtorInitializer *CXXBaseInit; |
| 5138 | if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, |
| 5139 | &VBase, IsInheritedVirtualBase, |
| 5140 | CXXBaseInit)) { |
| 5141 | HadError = true; |
| 5142 | continue; |
| 5143 | } |
| 5144 | |
| 5145 | Info.AllToInit.push_back(CXXBaseInit); |
| 5146 | } |
| 5147 | } |
| 5148 | |
| 5149 | // Non-virtual bases. |
| 5150 | for (auto &Base : ClassDecl->bases()) { |
| 5151 | // Virtuals are in the virtual base list and already constructed. |
| 5152 | if (Base.isVirtual()) |
| 5153 | continue; |
| 5154 | |
| 5155 | if (CXXCtorInitializer *Value |
| 5156 | = Info.AllBaseFields.lookup(Base.getType()->getAs<RecordType>())) { |
| 5157 | Info.AllToInit.push_back(Value); |
| 5158 | } else if (!AnyErrors) { |
| 5159 | CXXCtorInitializer *CXXBaseInit; |
| 5160 | if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, |
| 5161 | &Base, /*IsInheritedVirtualBase=*/false, |
| 5162 | CXXBaseInit)) { |
| 5163 | HadError = true; |
| 5164 | continue; |
| 5165 | } |
| 5166 | |
| 5167 | Info.AllToInit.push_back(CXXBaseInit); |
| 5168 | } |
| 5169 | } |
| 5170 | |
| 5171 | // Fields. |
| 5172 | for (auto *Mem : ClassDecl->decls()) { |
| 5173 | if (auto *F = dyn_cast<FieldDecl>(Mem)) { |
| 5174 | // C++ [class.bit]p2: |
| 5175 | // A declaration for a bit-field that omits the identifier declares an |
| 5176 | // unnamed bit-field. Unnamed bit-fields are not members and cannot be |
| 5177 | // initialized. |
| 5178 | if (F->isUnnamedBitfield()) |
| 5179 | continue; |
| 5180 | |
| 5181 | // If we're not generating the implicit copy/move constructor, then we'll |
| 5182 | // handle anonymous struct/union fields based on their individual |
| 5183 | // indirect fields. |
| 5184 | if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) |
| 5185 | continue; |
| 5186 | |
| 5187 | if (CollectFieldInitializer(*this, Info, F)) |
| 5188 | HadError = true; |
| 5189 | continue; |
| 5190 | } |
| 5191 | |
| 5192 | // Beyond this point, we only consider default initialization. |
| 5193 | if (Info.isImplicitCopyOrMove()) |
| 5194 | continue; |
| 5195 | |
| 5196 | if (auto *F = dyn_cast<IndirectFieldDecl>(Mem)) { |
| 5197 | if (F->getType()->isIncompleteArrayType()) { |
| 5198 | assert(ClassDecl->hasFlexibleArrayMember() &&((void)0) |
| 5199 | "Incomplete array type is not valid")((void)0); |
| 5200 | continue; |
| 5201 | } |
| 5202 | |
| 5203 | // Initialize each field of an anonymous struct individually. |
| 5204 | if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) |
| 5205 | HadError = true; |
| 5206 | |
| 5207 | continue; |
| 5208 | } |
| 5209 | } |
| 5210 | |
| 5211 | unsigned NumInitializers = Info.AllToInit.size(); |
| 5212 | if (NumInitializers > 0) { |
| 5213 | Constructor->setNumCtorInitializers(NumInitializers); |
| 5214 | CXXCtorInitializer **baseOrMemberInitializers = |
| 5215 | new (Context) CXXCtorInitializer*[NumInitializers]; |
| 5216 | memcpy(baseOrMemberInitializers, Info.AllToInit.data(), |
| 5217 | NumInitializers * sizeof(CXXCtorInitializer*)); |
| 5218 | Constructor->setCtorInitializers(baseOrMemberInitializers); |
| 5219 | |
| 5220 | // Constructors implicitly reference the base and member |
| 5221 | // destructors. |
| 5222 | MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), |
| 5223 | Constructor->getParent()); |
| 5224 | } |
| 5225 | |
| 5226 | return HadError; |
| 5227 | } |
| 5228 | |
| 5229 | static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { |
| 5230 | if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { |
| 5231 | const RecordDecl *RD = RT->getDecl(); |
| 5232 | if (RD->isAnonymousStructOrUnion()) { |
| 5233 | for (auto *Field : RD->fields()) |
| 5234 | PopulateKeysForFields(Field, IdealInits); |
| 5235 | return; |
| 5236 | } |
| 5237 | } |
| 5238 | IdealInits.push_back(Field->getCanonicalDecl()); |
| 5239 | } |
| 5240 | |
| 5241 | static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) { |
| 5242 | return Context.getCanonicalType(BaseType).getTypePtr(); |
| 5243 | } |
| 5244 | |
| 5245 | static const void *GetKeyForMember(ASTContext &Context, |
| 5246 | CXXCtorInitializer *Member) { |
| 5247 | if (!Member->isAnyMemberInitializer()) |
| 5248 | return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); |
| 5249 | |
| 5250 | return Member->getAnyMember()->getCanonicalDecl(); |
| 5251 | } |
| 5252 | |
| 5253 | static void AddInitializerToDiag(const Sema::SemaDiagnosticBuilder &Diag, |
| 5254 | const CXXCtorInitializer *Previous, |
| 5255 | const CXXCtorInitializer *Current) { |
| 5256 | if (Previous->isAnyMemberInitializer()) |
| 5257 | Diag << 0 << Previous->getAnyMember(); |
| 5258 | else |
| 5259 | Diag << 1 << Previous->getTypeSourceInfo()->getType(); |
| 5260 | |
| 5261 | if (Current->isAnyMemberInitializer()) |
| 5262 | Diag << 0 << Current->getAnyMember(); |
| 5263 | else |
| 5264 | Diag << 1 << Current->getTypeSourceInfo()->getType(); |
| 5265 | } |
| 5266 | |
| 5267 | static void DiagnoseBaseOrMemInitializerOrder( |
| 5268 | Sema &SemaRef, const CXXConstructorDecl *Constructor, |
| 5269 | ArrayRef<CXXCtorInitializer *> Inits) { |
| 5270 | if (Constructor->getDeclContext()->isDependentContext()) |
| 5271 | return; |
| 5272 | |
| 5273 | // Don't check initializers order unless the warning is enabled at the |
| 5274 | // location of at least one initializer. |
| 5275 | bool ShouldCheckOrder = false; |
| 5276 | for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { |
| 5277 | CXXCtorInitializer *Init = Inits[InitIndex]; |
| 5278 | if (!SemaRef.Diags.isIgnored(diag::warn_initializer_out_of_order, |
| 5279 | Init->getSourceLocation())) { |
| 5280 | ShouldCheckOrder = true; |
| 5281 | break; |
| 5282 | } |
| 5283 | } |
| 5284 | if (!ShouldCheckOrder) |
| 5285 | return; |
| 5286 | |
| 5287 | // Build the list of bases and members in the order that they'll |
| 5288 | // actually be initialized. The explicit initializers should be in |
| 5289 | // this same order but may be missing things. |
| 5290 | SmallVector<const void*, 32> IdealInitKeys; |
| 5291 | |
| 5292 | const CXXRecordDecl *ClassDecl = Constructor->getParent(); |
| 5293 | |
| 5294 | // 1. Virtual bases. |
| 5295 | for (const auto &VBase : ClassDecl->vbases()) |
| 5296 | IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase.getType())); |
| 5297 | |
| 5298 | // 2. Non-virtual bases. |
| 5299 | for (const auto &Base : ClassDecl->bases()) { |
| 5300 | if (Base.isVirtual()) |
| 5301 | continue; |
| 5302 | IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base.getType())); |
| 5303 | } |
| 5304 | |
| 5305 | // 3. Direct fields. |
| 5306 | for (auto *Field : ClassDecl->fields()) { |
| 5307 | if (Field->isUnnamedBitfield()) |
| 5308 | continue; |
| 5309 | |
| 5310 | PopulateKeysForFields(Field, IdealInitKeys); |
| 5311 | } |
| 5312 | |
| 5313 | unsigned NumIdealInits = IdealInitKeys.size(); |
| 5314 | unsigned IdealIndex = 0; |
| 5315 | |
| 5316 | // Track initializers that are in an incorrect order for either a warning or |
| 5317 | // note if multiple ones occur. |
| 5318 | SmallVector<unsigned> WarnIndexes; |
| 5319 | // Correlates the index of an initializer in the init-list to the index of |
| 5320 | // the field/base in the class. |
| 5321 | SmallVector<std::pair<unsigned, unsigned>, 32> CorrelatedInitOrder; |
| 5322 | |
| 5323 | for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { |
| 5324 | const void *InitKey = GetKeyForMember(SemaRef.Context, Inits[InitIndex]); |
| 5325 | |
| 5326 | // Scan forward to try to find this initializer in the idealized |
| 5327 | // initializers list. |
| 5328 | for (; IdealIndex != NumIdealInits; ++IdealIndex) |
| 5329 | if (InitKey == IdealInitKeys[IdealIndex]) |
| 5330 | break; |
| 5331 | |
| 5332 | // If we didn't find this initializer, it must be because we |
| 5333 | // scanned past it on a previous iteration. That can only |
| 5334 | // happen if we're out of order; emit a warning. |
| 5335 | if (IdealIndex == NumIdealInits && InitIndex) { |
| 5336 | WarnIndexes.push_back(InitIndex); |
| 5337 | |
| 5338 | // Move back to the initializer's location in the ideal list. |
| 5339 | for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) |
| 5340 | if (InitKey == IdealInitKeys[IdealIndex]) |
| 5341 | break; |
| 5342 | |
| 5343 | assert(IdealIndex < NumIdealInits &&((void)0) |
| 5344 | "initializer not found in initializer list")((void)0); |
| 5345 | } |
| 5346 | CorrelatedInitOrder.emplace_back(IdealIndex, InitIndex); |
| 5347 | } |
| 5348 | |
| 5349 | if (WarnIndexes.empty()) |
| 5350 | return; |
| 5351 | |
| 5352 | // Sort based on the ideal order, first in the pair. |
| 5353 | llvm::sort(CorrelatedInitOrder, |
| 5354 | [](auto &LHS, auto &RHS) { return LHS.first < RHS.first; }); |
| 5355 | |
| 5356 | // Introduce a new scope as SemaDiagnosticBuilder needs to be destroyed to |
| 5357 | // emit the diagnostic before we can try adding notes. |
| 5358 | { |
| 5359 | Sema::SemaDiagnosticBuilder D = SemaRef.Diag( |
| 5360 | Inits[WarnIndexes.front() - 1]->getSourceLocation(), |
| 5361 | WarnIndexes.size() == 1 ? diag::warn_initializer_out_of_order |
| 5362 | : diag::warn_some_initializers_out_of_order); |
| 5363 | |
| 5364 | for (unsigned I = 0; I < CorrelatedInitOrder.size(); ++I) { |
| 5365 | if (CorrelatedInitOrder[I].second == I) |
| 5366 | continue; |
| 5367 | // Ideally we would be using InsertFromRange here, but clang doesn't |
| 5368 | // appear to handle InsertFromRange correctly when the source range is |
| 5369 | // modified by another fix-it. |
| 5370 | D << FixItHint::CreateReplacement( |
| 5371 | Inits[I]->getSourceRange(), |
| 5372 | Lexer::getSourceText( |
| 5373 | CharSourceRange::getTokenRange( |
| 5374 | Inits[CorrelatedInitOrder[I].second]->getSourceRange()), |
| 5375 | SemaRef.getSourceManager(), SemaRef.getLangOpts())); |
| 5376 | } |
| 5377 | |
| 5378 | // If there is only 1 item out of order, the warning expects the name and |
| 5379 | // type of each being added to it. |
| 5380 | if (WarnIndexes.size() == 1) { |
| 5381 | AddInitializerToDiag(D, Inits[WarnIndexes.front() - 1], |
| 5382 | Inits[WarnIndexes.front()]); |
| 5383 | return; |
| 5384 | } |
| 5385 | } |
| 5386 | // More than 1 item to warn, create notes letting the user know which ones |
| 5387 | // are bad. |
| 5388 | for (unsigned WarnIndex : WarnIndexes) { |
| 5389 | const clang::CXXCtorInitializer *PrevInit = Inits[WarnIndex - 1]; |
| 5390 | auto D = SemaRef.Diag(PrevInit->getSourceLocation(), |
| 5391 | diag::note_initializer_out_of_order); |
| 5392 | AddInitializerToDiag(D, PrevInit, Inits[WarnIndex]); |
| 5393 | D << PrevInit->getSourceRange(); |
| 5394 | } |
| 5395 | } |
| 5396 | |
| 5397 | namespace { |
| 5398 | bool CheckRedundantInit(Sema &S, |
| 5399 | CXXCtorInitializer *Init, |
| 5400 | CXXCtorInitializer *&PrevInit) { |
| 5401 | if (!PrevInit) { |
| 5402 | PrevInit = Init; |
| 5403 | return false; |
| 5404 | } |
| 5405 | |
| 5406 | if (FieldDecl *Field = Init->getAnyMember()) |
| 5407 | S.Diag(Init->getSourceLocation(), |
| 5408 | diag::err_multiple_mem_initialization) |
| 5409 | << Field->getDeclName() |
| 5410 | << Init->getSourceRange(); |
| 5411 | else { |
| 5412 | const Type *BaseClass = Init->getBaseClass(); |
| 5413 | assert(BaseClass && "neither field nor base")((void)0); |
| 5414 | S.Diag(Init->getSourceLocation(), |
| 5415 | diag::err_multiple_base_initialization) |
| 5416 | << QualType(BaseClass, 0) |
| 5417 | << Init->getSourceRange(); |
| 5418 | } |
| 5419 | S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) |
| 5420 | << 0 << PrevInit->getSourceRange(); |
| 5421 | |
| 5422 | return true; |
| 5423 | } |
| 5424 | |
| 5425 | typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; |
| 5426 | typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; |
| 5427 | |
| 5428 | bool CheckRedundantUnionInit(Sema &S, |
| 5429 | CXXCtorInitializer *Init, |
| 5430 | RedundantUnionMap &Unions) { |
| 5431 | FieldDecl *Field = Init->getAnyMember(); |
| 5432 | RecordDecl *Parent = Field->getParent(); |
| 5433 | NamedDecl *Child = Field; |
| 5434 | |
| 5435 | while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { |
| 5436 | if (Parent->isUnion()) { |
| 5437 | UnionEntry &En = Unions[Parent]; |
| 5438 | if (En.first && En.first != Child) { |
| 5439 | S.Diag(Init->getSourceLocation(), |
| 5440 | diag::err_multiple_mem_union_initialization) |
| 5441 | << Field->getDeclName() |
| 5442 | << Init->getSourceRange(); |
| 5443 | S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) |
| 5444 | << 0 << En.second->getSourceRange(); |
| 5445 | return true; |
| 5446 | } |
| 5447 | if (!En.first) { |
| 5448 | En.first = Child; |
| 5449 | En.second = Init; |
| 5450 | } |
| 5451 | if (!Parent->isAnonymousStructOrUnion()) |
| 5452 | return false; |
| 5453 | } |
| 5454 | |
| 5455 | Child = Parent; |
| 5456 | Parent = cast<RecordDecl>(Parent->getDeclContext()); |
| 5457 | } |
| 5458 | |
| 5459 | return false; |
| 5460 | } |
| 5461 | } // namespace |
| 5462 | |
| 5463 | /// ActOnMemInitializers - Handle the member initializers for a constructor. |
| 5464 | void Sema::ActOnMemInitializers(Decl *ConstructorDecl, |
| 5465 | SourceLocation ColonLoc, |
| 5466 | ArrayRef<CXXCtorInitializer*> MemInits, |
| 5467 | bool AnyErrors) { |
| 5468 | if (!ConstructorDecl) |
| 5469 | return; |
| 5470 | |
| 5471 | AdjustDeclIfTemplate(ConstructorDecl); |
| 5472 | |
| 5473 | CXXConstructorDecl *Constructor |
| 5474 | = dyn_cast<CXXConstructorDecl>(ConstructorDecl); |
| 5475 | |
| 5476 | if (!Constructor) { |
| 5477 | Diag(ColonLoc, diag::err_only_constructors_take_base_inits); |
| 5478 | return; |
| 5479 | } |
| 5480 | |
| 5481 | // Mapping for the duplicate initializers check. |
| 5482 | // For member initializers, this is keyed with a FieldDecl*. |
| 5483 | // For base initializers, this is keyed with a Type*. |
| 5484 | llvm::DenseMap<const void *, CXXCtorInitializer *> Members; |
| 5485 | |
| 5486 | // Mapping for the inconsistent anonymous-union initializers check. |
| 5487 | RedundantUnionMap MemberUnions; |
| 5488 | |
| 5489 | bool HadError = false; |
| 5490 | for (unsigned i = 0; i < MemInits.size(); i++) { |
| 5491 | CXXCtorInitializer *Init = MemInits[i]; |
| 5492 | |
| 5493 | // Set the source order index. |
| 5494 | Init->setSourceOrder(i); |
| 5495 | |
| 5496 | if (Init->isAnyMemberInitializer()) { |
| 5497 | const void *Key = GetKeyForMember(Context, Init); |
| 5498 | if (CheckRedundantInit(*this, Init, Members[Key]) || |
| 5499 | CheckRedundantUnionInit(*this, Init, MemberUnions)) |
| 5500 | HadError = true; |
| 5501 | } else if (Init->isBaseInitializer()) { |
| 5502 | const void *Key = GetKeyForMember(Context, Init); |
| 5503 | if (CheckRedundantInit(*this, Init, Members[Key])) |
| 5504 | HadError = true; |
| 5505 | } else { |
| 5506 | assert(Init->isDelegatingInitializer())((void)0); |
| 5507 | // This must be the only initializer |
| 5508 | if (MemInits.size() != 1) { |
| 5509 | Diag(Init->getSourceLocation(), |
| 5510 | diag::err_delegating_initializer_alone) |
| 5511 | << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); |
| 5512 | // We will treat this as being the only initializer. |
| 5513 | } |
| 5514 | SetDelegatingInitializer(Constructor, MemInits[i]); |
| 5515 | // Return immediately as the initializer is set. |
| 5516 | return; |
| 5517 | } |
| 5518 | } |
| 5519 | |
| 5520 | if (HadError) |
| 5521 | return; |
| 5522 | |
| 5523 | DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); |
| 5524 | |
| 5525 | SetCtorInitializers(Constructor, AnyErrors, MemInits); |
| 5526 | |
| 5527 | DiagnoseUninitializedFields(*this, Constructor); |
| 5528 | } |
| 5529 | |
| 5530 | void |
| 5531 | Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, |
| 5532 | CXXRecordDecl *ClassDecl) { |
| 5533 | // Ignore dependent contexts. Also ignore unions, since their members never |
| 5534 | // have destructors implicitly called. |
| 5535 | if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) |
| 5536 | return; |
| 5537 | |
| 5538 | // FIXME: all the access-control diagnostics are positioned on the |
| 5539 | // field/base declaration. That's probably good; that said, the |
| 5540 | // user might reasonably want to know why the destructor is being |
| 5541 | // emitted, and we currently don't say. |
| 5542 | |
| 5543 | // Non-static data members. |
| 5544 | for (auto *Field : ClassDecl->fields()) { |
| 5545 | if (Field->isInvalidDecl()) |
| 5546 | continue; |
| 5547 | |
| 5548 | // Don't destroy incomplete or zero-length arrays. |
| 5549 | if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) |
| 5550 | continue; |
| 5551 | |
| 5552 | QualType FieldType = Context.getBaseElementType(Field->getType()); |
| 5553 | |
| 5554 | const RecordType* RT = FieldType->getAs<RecordType>(); |
| 5555 | if (!RT) |
| 5556 | continue; |
| 5557 | |
| 5558 | CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); |
| 5559 | if (FieldClassDecl->isInvalidDecl()) |
| 5560 | continue; |
| 5561 | if (FieldClassDecl->hasIrrelevantDestructor()) |
| 5562 | continue; |
| 5563 | // The destructor for an implicit anonymous union member is never invoked. |
| 5564 | if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) |
| 5565 | continue; |
| 5566 | |
| 5567 | CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); |
| 5568 | assert(Dtor && "No dtor found for FieldClassDecl!")((void)0); |
| 5569 | CheckDestructorAccess(Field->getLocation(), Dtor, |
| 5570 | PDiag(diag::err_access_dtor_field) |
| 5571 | << Field->getDeclName() |
| 5572 | << FieldType); |
| 5573 | |
| 5574 | MarkFunctionReferenced(Location, Dtor); |
| 5575 | DiagnoseUseOfDecl(Dtor, Location); |
| 5576 | } |
| 5577 | |
| 5578 | // We only potentially invoke the destructors of potentially constructed |
| 5579 | // subobjects. |
| 5580 | bool VisitVirtualBases = !ClassDecl->isAbstract(); |
| 5581 | |
| 5582 | // If the destructor exists and has already been marked used in the MS ABI, |
| 5583 | // then virtual base destructors have already been checked and marked used. |
| 5584 | // Skip checking them again to avoid duplicate diagnostics. |
| 5585 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
| 5586 | CXXDestructorDecl *Dtor = ClassDecl->getDestructor(); |
| 5587 | if (Dtor && Dtor->isUsed()) |
| 5588 | VisitVirtualBases = false; |
| 5589 | } |
| 5590 | |
| 5591 | llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; |
| 5592 | |
| 5593 | // Bases. |
| 5594 | for (const auto &Base : ClassDecl->bases()) { |
| 5595 | const RecordType *RT = Base.getType()->getAs<RecordType>(); |
| 5596 | if (!RT) |
| 5597 | continue; |
| 5598 | |
| 5599 | // Remember direct virtual bases. |
| 5600 | if (Base.isVirtual()) { |
| 5601 | if (!VisitVirtualBases) |
| 5602 | continue; |
| 5603 | DirectVirtualBases.insert(RT); |
| 5604 | } |
| 5605 | |
| 5606 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); |
| 5607 | // If our base class is invalid, we probably can't get its dtor anyway. |
| 5608 | if (BaseClassDecl->isInvalidDecl()) |
| 5609 | continue; |
| 5610 | if (BaseClassDecl->hasIrrelevantDestructor()) |
| 5611 | continue; |
| 5612 | |
| 5613 | CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); |
| 5614 | assert(Dtor && "No dtor found for BaseClassDecl!")((void)0); |
| 5615 | |
| 5616 | // FIXME: caret should be on the start of the class name |
| 5617 | CheckDestructorAccess(Base.getBeginLoc(), Dtor, |
| 5618 | PDiag(diag::err_access_dtor_base) |
| 5619 | << Base.getType() << Base.getSourceRange(), |
| 5620 | Context.getTypeDeclType(ClassDecl)); |
| 5621 | |
| 5622 | MarkFunctionReferenced(Location, Dtor); |
| 5623 | DiagnoseUseOfDecl(Dtor, Location); |
| 5624 | } |
| 5625 | |
| 5626 | if (VisitVirtualBases) |
| 5627 | MarkVirtualBaseDestructorsReferenced(Location, ClassDecl, |
| 5628 | &DirectVirtualBases); |
| 5629 | } |
| 5630 | |
| 5631 | void Sema::MarkVirtualBaseDestructorsReferenced( |
| 5632 | SourceLocation Location, CXXRecordDecl *ClassDecl, |
| 5633 | llvm::SmallPtrSetImpl<const RecordType *> *DirectVirtualBases) { |
| 5634 | // Virtual bases. |
| 5635 | for (const auto &VBase : ClassDecl->vbases()) { |
| 5636 | // Bases are always records in a well-formed non-dependent class. |
| 5637 | const RecordType *RT = VBase.getType()->castAs<RecordType>(); |
| 5638 | |
| 5639 | // Ignore already visited direct virtual bases. |
| 5640 | if (DirectVirtualBases && DirectVirtualBases->count(RT)) |
| 5641 | continue; |
| 5642 | |
| 5643 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); |
| 5644 | // If our base class is invalid, we probably can't get its dtor anyway. |
| 5645 | if (BaseClassDecl->isInvalidDecl()) |
| 5646 | continue; |
| 5647 | if (BaseClassDecl->hasIrrelevantDestructor()) |
| 5648 | continue; |
| 5649 | |
| 5650 | CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); |
| 5651 | assert(Dtor && "No dtor found for BaseClassDecl!")((void)0); |
| 5652 | if (CheckDestructorAccess( |
| 5653 | ClassDecl->getLocation(), Dtor, |
| 5654 | PDiag(diag::err_access_dtor_vbase) |
| 5655 | << Context.getTypeDeclType(ClassDecl) << VBase.getType(), |
| 5656 | Context.getTypeDeclType(ClassDecl)) == |
| 5657 | AR_accessible) { |
| 5658 | CheckDerivedToBaseConversion( |
| 5659 | Context.getTypeDeclType(ClassDecl), VBase.getType(), |
| 5660 | diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), |
| 5661 | SourceRange(), DeclarationName(), nullptr); |
| 5662 | } |
| 5663 | |
| 5664 | MarkFunctionReferenced(Location, Dtor); |
| 5665 | DiagnoseUseOfDecl(Dtor, Location); |
| 5666 | } |
| 5667 | } |
| 5668 | |
| 5669 | void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { |
| 5670 | if (!CDtorDecl) |
| 5671 | return; |
| 5672 | |
| 5673 | if (CXXConstructorDecl *Constructor |
| 5674 | = dyn_cast<CXXConstructorDecl>(CDtorDecl)) { |
| 5675 | SetCtorInitializers(Constructor, /*AnyErrors=*/false); |
| 5676 | DiagnoseUninitializedFields(*this, Constructor); |
| 5677 | } |
| 5678 | } |
| 5679 | |
| 5680 | bool Sema::isAbstractType(SourceLocation Loc, QualType T) { |
| 5681 | if (!getLangOpts().CPlusPlus) |
| 5682 | return false; |
| 5683 | |
| 5684 | const auto *RD = Context.getBaseElementType(T)->getAsCXXRecordDecl(); |
| 5685 | if (!RD) |
| 5686 | return false; |
| 5687 | |
| 5688 | // FIXME: Per [temp.inst]p1, we are supposed to trigger instantiation of a |
| 5689 | // class template specialization here, but doing so breaks a lot of code. |
| 5690 | |
| 5691 | // We can't answer whether something is abstract until it has a |
| 5692 | // definition. If it's currently being defined, we'll walk back |
| 5693 | // over all the declarations when we have a full definition. |
| 5694 | const CXXRecordDecl *Def = RD->getDefinition(); |
| 5695 | if (!Def || Def->isBeingDefined()) |
| 5696 | return false; |
| 5697 | |
| 5698 | return RD->isAbstract(); |
| 5699 | } |
| 5700 | |
| 5701 | bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, |
| 5702 | TypeDiagnoser &Diagnoser) { |
| 5703 | if (!isAbstractType(Loc, T)) |
| 5704 | return false; |
| 5705 | |
| 5706 | T = Context.getBaseElementType(T); |
| 5707 | Diagnoser.diagnose(*this, Loc, T); |
| 5708 | DiagnoseAbstractType(T->getAsCXXRecordDecl()); |
| 5709 | return true; |
| 5710 | } |
| 5711 | |
| 5712 | void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { |
| 5713 | // Check if we've already emitted the list of pure virtual functions |
| 5714 | // for this class. |
| 5715 | if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) |
| 5716 | return; |
| 5717 | |
| 5718 | // If the diagnostic is suppressed, don't emit the notes. We're only |
| 5719 | // going to emit them once, so try to attach them to a diagnostic we're |
| 5720 | // actually going to show. |
| 5721 | if (Diags.isLastDiagnosticIgnored()) |
| 5722 | return; |
| 5723 | |
| 5724 | CXXFinalOverriderMap FinalOverriders; |
| 5725 | RD->getFinalOverriders(FinalOverriders); |
| 5726 | |
| 5727 | // Keep a set of seen pure methods so we won't diagnose the same method |
| 5728 | // more than once. |
| 5729 | llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; |
| 5730 | |
| 5731 | for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), |
| 5732 | MEnd = FinalOverriders.end(); |
| 5733 | M != MEnd; |
| 5734 | ++M) { |
| 5735 | for (OverridingMethods::iterator SO = M->second.begin(), |
| 5736 | SOEnd = M->second.end(); |
| 5737 | SO != SOEnd; ++SO) { |
| 5738 | // C++ [class.abstract]p4: |
| 5739 | // A class is abstract if it contains or inherits at least one |
| 5740 | // pure virtual function for which the final overrider is pure |
| 5741 | // virtual. |
| 5742 | |
| 5743 | // |
| 5744 | if (SO->second.size() != 1) |
| 5745 | continue; |
| 5746 | |
| 5747 | if (!SO->second.front().Method->isPure()) |
| 5748 | continue; |
| 5749 | |
| 5750 | if (!SeenPureMethods.insert(SO->second.front().Method).second) |
| 5751 | continue; |
| 5752 | |
| 5753 | Diag(SO->second.front().Method->getLocation(), |
| 5754 | diag::note_pure_virtual_function) |
| 5755 | << SO->second.front().Method->getDeclName() << RD->getDeclName(); |
| 5756 | } |
| 5757 | } |
| 5758 | |
| 5759 | if (!PureVirtualClassDiagSet) |
| 5760 | PureVirtualClassDiagSet.reset(new RecordDeclSetTy); |
| 5761 | PureVirtualClassDiagSet->insert(RD); |
| 5762 | } |
| 5763 | |
| 5764 | namespace { |
| 5765 | struct AbstractUsageInfo { |
| 5766 | Sema &S; |
| 5767 | CXXRecordDecl *Record; |
| 5768 | CanQualType AbstractType; |
| 5769 | bool Invalid; |
| 5770 | |
| 5771 | AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) |
| 5772 | : S(S), Record(Record), |
| 5773 | AbstractType(S.Context.getCanonicalType( |
| 5774 | S.Context.getTypeDeclType(Record))), |
| 5775 | Invalid(false) {} |
| 5776 | |
| 5777 | void DiagnoseAbstractType() { |
| 5778 | if (Invalid) return; |
| 5779 | S.DiagnoseAbstractType(Record); |
| 5780 | Invalid = true; |
| 5781 | } |
| 5782 | |
| 5783 | void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); |
| 5784 | }; |
| 5785 | |
| 5786 | struct CheckAbstractUsage { |
| 5787 | AbstractUsageInfo &Info; |
| 5788 | const NamedDecl *Ctx; |
| 5789 | |
| 5790 | CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) |
| 5791 | : Info(Info), Ctx(Ctx) {} |
| 5792 | |
| 5793 | void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { |
| 5794 | switch (TL.getTypeLocClass()) { |
| 5795 | #define ABSTRACT_TYPELOC(CLASS, PARENT) |
| 5796 | #define TYPELOC(CLASS, PARENT) \ |
| 5797 | case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; |
| 5798 | #include "clang/AST/TypeLocNodes.def" |
| 5799 | } |
| 5800 | } |
| 5801 | |
| 5802 | void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { |
| 5803 | Visit(TL.getReturnLoc(), Sema::AbstractReturnType); |
| 5804 | for (unsigned I = 0, E = TL.getNumParams(); I != E; ++I) { |
| 5805 | if (!TL.getParam(I)) |
| 5806 | continue; |
| 5807 | |
| 5808 | TypeSourceInfo *TSI = TL.getParam(I)->getTypeSourceInfo(); |
| 5809 | if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); |
| 5810 | } |
| 5811 | } |
| 5812 | |
| 5813 | void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { |
| 5814 | Visit(TL.getElementLoc(), Sema::AbstractArrayType); |
| 5815 | } |
| 5816 | |
| 5817 | void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { |
| 5818 | // Visit the type parameters from a permissive context. |
| 5819 | for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { |
| 5820 | TemplateArgumentLoc TAL = TL.getArgLoc(I); |
| 5821 | if (TAL.getArgument().getKind() == TemplateArgument::Type) |
| 5822 | if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) |
| 5823 | Visit(TSI->getTypeLoc(), Sema::AbstractNone); |
| 5824 | // TODO: other template argument types? |
| 5825 | } |
| 5826 | } |
| 5827 | |
| 5828 | // Visit pointee types from a permissive context. |
| 5829 | #define CheckPolymorphic(Type)void Check(Type TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc (), Sema::AbstractNone); } \ |
| 5830 | void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ |
| 5831 | Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ |
| 5832 | } |
| 5833 | CheckPolymorphic(PointerTypeLoc)void Check(PointerTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit (TL.getNextTypeLoc(), Sema::AbstractNone); } |
| 5834 | CheckPolymorphic(ReferenceTypeLoc)void Check(ReferenceTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } |
| 5835 | CheckPolymorphic(MemberPointerTypeLoc)void Check(MemberPointerTypeLoc TL, Sema::AbstractDiagSelID Sel ) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } |
| 5836 | CheckPolymorphic(BlockPointerTypeLoc)void Check(BlockPointerTypeLoc TL, Sema::AbstractDiagSelID Sel ) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } |
| 5837 | CheckPolymorphic(AtomicTypeLoc)void Check(AtomicTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit (TL.getNextTypeLoc(), Sema::AbstractNone); } |
| 5838 | |
| 5839 | /// Handle all the types we haven't given a more specific |
| 5840 | /// implementation for above. |
| 5841 | void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { |
| 5842 | // Every other kind of type that we haven't called out already |
| 5843 | // that has an inner type is either (1) sugar or (2) contains that |
| 5844 | // inner type in some way as a subobject. |
| 5845 | if (TypeLoc Next = TL.getNextTypeLoc()) |
| 5846 | return Visit(Next, Sel); |
| 5847 | |
| 5848 | // If there's no inner type and we're in a permissive context, |
| 5849 | // don't diagnose. |
| 5850 | if (Sel == Sema::AbstractNone) return; |
| 5851 | |
| 5852 | // Check whether the type matches the abstract type. |
| 5853 | QualType T = TL.getType(); |
| 5854 | if (T->isArrayType()) { |
| 5855 | Sel = Sema::AbstractArrayType; |
| 5856 | T = Info.S.Context.getBaseElementType(T); |
| 5857 | } |
| 5858 | CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); |
| 5859 | if (CT != Info.AbstractType) return; |
| 5860 | |
| 5861 | // It matched; do some magic. |
| 5862 | if (Sel == Sema::AbstractArrayType) { |
| 5863 | Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) |
| 5864 | << T << TL.getSourceRange(); |
| 5865 | } else { |
| 5866 | Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) |
| 5867 | << Sel << T << TL.getSourceRange(); |
| 5868 | } |
| 5869 | Info.DiagnoseAbstractType(); |
| 5870 | } |
| 5871 | }; |
| 5872 | |
| 5873 | void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, |
| 5874 | Sema::AbstractDiagSelID Sel) { |
| 5875 | CheckAbstractUsage(*this, D).Visit(TL, Sel); |
| 5876 | } |
| 5877 | |
| 5878 | } |
| 5879 | |
| 5880 | /// Check for invalid uses of an abstract type in a method declaration. |
| 5881 | static void CheckAbstractClassUsage(AbstractUsageInfo &Info, |
| 5882 | CXXMethodDecl *MD) { |
| 5883 | // No need to do the check on definitions, which require that |
| 5884 | // the return/param types be complete. |
| 5885 | if (MD->doesThisDeclarationHaveABody()) |
| 5886 | return; |
| 5887 | |
| 5888 | // For safety's sake, just ignore it if we don't have type source |
| 5889 | // information. This should never happen for non-implicit methods, |
| 5890 | // but... |
| 5891 | if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) |
| 5892 | Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); |
| 5893 | } |
| 5894 | |
| 5895 | /// Check for invalid uses of an abstract type within a class definition. |
| 5896 | static void CheckAbstractClassUsage(AbstractUsageInfo &Info, |
| 5897 | CXXRecordDecl *RD) { |
| 5898 | for (auto *D : RD->decls()) { |
| 5899 | if (D->isImplicit()) continue; |
| 5900 | |
| 5901 | // Methods and method templates. |
| 5902 | if (isa<CXXMethodDecl>(D)) { |
| 5903 | CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); |
| 5904 | } else if (isa<FunctionTemplateDecl>(D)) { |
| 5905 | FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); |
| 5906 | CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); |
| 5907 | |
| 5908 | // Fields and static variables. |
| 5909 | } else if (isa<FieldDecl>(D)) { |
| 5910 | FieldDecl *FD = cast<FieldDecl>(D); |
| 5911 | if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) |
| 5912 | Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); |
| 5913 | } else if (isa<VarDecl>(D)) { |
| 5914 | VarDecl *VD = cast<VarDecl>(D); |
| 5915 | if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) |
| 5916 | Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); |
| 5917 | |
| 5918 | // Nested classes and class templates. |
| 5919 | } else if (isa<CXXRecordDecl>(D)) { |
| 5920 | CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); |
| 5921 | } else if (isa<ClassTemplateDecl>(D)) { |
| 5922 | CheckAbstractClassUsage(Info, |
| 5923 | cast<ClassTemplateDecl>(D)->getTemplatedDecl()); |
| 5924 | } |
| 5925 | } |
| 5926 | } |
| 5927 | |
| 5928 | static void ReferenceDllExportedMembers(Sema &S, CXXRecordDecl *Class) { |
| 5929 | Attr *ClassAttr = getDLLAttr(Class); |
| 5930 | if (!ClassAttr) |
| 5931 | return; |
| 5932 | |
| 5933 | assert(ClassAttr->getKind() == attr::DLLExport)((void)0); |
| 5934 | |
| 5935 | TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind(); |
| 5936 | |
| 5937 | if (TSK == TSK_ExplicitInstantiationDeclaration) |
| 5938 | // Don't go any further if this is just an explicit instantiation |
| 5939 | // declaration. |
| 5940 | return; |
| 5941 | |
| 5942 | // Add a context note to explain how we got to any diagnostics produced below. |
| 5943 | struct MarkingClassDllexported { |
| 5944 | Sema &S; |
| 5945 | MarkingClassDllexported(Sema &S, CXXRecordDecl *Class, |
| 5946 | SourceLocation AttrLoc) |
| 5947 | : S(S) { |
| 5948 | Sema::CodeSynthesisContext Ctx; |
| 5949 | Ctx.Kind = Sema::CodeSynthesisContext::MarkingClassDllexported; |
| 5950 | Ctx.PointOfInstantiation = AttrLoc; |
| 5951 | Ctx.Entity = Class; |
| 5952 | S.pushCodeSynthesisContext(Ctx); |
| 5953 | } |
| 5954 | ~MarkingClassDllexported() { |
| 5955 | S.popCodeSynthesisContext(); |
| 5956 | } |
| 5957 | } MarkingDllexportedContext(S, Class, ClassAttr->getLocation()); |
| 5958 | |
| 5959 | if (S.Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) |
| 5960 | S.MarkVTableUsed(Class->getLocation(), Class, true); |
| 5961 | |
| 5962 | for (Decl *Member : Class->decls()) { |
| 5963 | // Defined static variables that are members of an exported base |
| 5964 | // class must be marked export too. |
| 5965 | auto *VD = dyn_cast<VarDecl>(Member); |
| 5966 | if (VD && Member->getAttr<DLLExportAttr>() && |
| 5967 | VD->getStorageClass() == SC_Static && |
| 5968 | TSK == TSK_ImplicitInstantiation) |
| 5969 | S.MarkVariableReferenced(VD->getLocation(), VD); |
| 5970 | |
| 5971 | auto *MD = dyn_cast<CXXMethodDecl>(Member); |
| 5972 | if (!MD) |
| 5973 | continue; |
| 5974 | |
| 5975 | if (Member->getAttr<DLLExportAttr>()) { |
| 5976 | if (MD->isUserProvided()) { |
| 5977 | // Instantiate non-default class member functions ... |
| 5978 | |
| 5979 | // .. except for certain kinds of template specializations. |
| 5980 | if (TSK == TSK_ImplicitInstantiation && !ClassAttr->isInherited()) |
| 5981 | continue; |
| 5982 | |
| 5983 | S.MarkFunctionReferenced(Class->getLocation(), MD); |
| 5984 | |
| 5985 | // The function will be passed to the consumer when its definition is |
| 5986 | // encountered. |
| 5987 | } else if (MD->isExplicitlyDefaulted()) { |
| 5988 | // Synthesize and instantiate explicitly defaulted methods. |
| 5989 | S.MarkFunctionReferenced(Class->getLocation(), MD); |
| 5990 | |
| 5991 | if (TSK != TSK_ExplicitInstantiationDefinition) { |
| 5992 | // Except for explicit instantiation defs, we will not see the |
| 5993 | // definition again later, so pass it to the consumer now. |
| 5994 | S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD)); |
| 5995 | } |
| 5996 | } else if (!MD->isTrivial() || |
| 5997 | MD->isCopyAssignmentOperator() || |
| 5998 | MD->isMoveAssignmentOperator()) { |
| 5999 | // Synthesize and instantiate non-trivial implicit methods, and the copy |
| 6000 | // and move assignment operators. The latter are exported even if they |
| 6001 | // are trivial, because the address of an operator can be taken and |
| 6002 | // should compare equal across libraries. |
| 6003 | S.MarkFunctionReferenced(Class->getLocation(), MD); |
| 6004 | |
| 6005 | // There is no later point when we will see the definition of this |
| 6006 | // function, so pass it to the consumer now. |
| 6007 | S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD)); |
| 6008 | } |
| 6009 | } |
| 6010 | } |
| 6011 | } |
| 6012 | |
| 6013 | static void checkForMultipleExportedDefaultConstructors(Sema &S, |
| 6014 | CXXRecordDecl *Class) { |
| 6015 | // Only the MS ABI has default constructor closures, so we don't need to do |
| 6016 | // this semantic checking anywhere else. |
| 6017 | if (!S.Context.getTargetInfo().getCXXABI().isMicrosoft()) |
| 6018 | return; |
| 6019 | |
| 6020 | CXXConstructorDecl *LastExportedDefaultCtor = nullptr; |
| 6021 | for (Decl *Member : Class->decls()) { |
| 6022 | // Look for exported default constructors. |
| 6023 | auto *CD = dyn_cast<CXXConstructorDecl>(Member); |
| 6024 | if (!CD || !CD->isDefaultConstructor()) |
| 6025 | continue; |
| 6026 | auto *Attr = CD->getAttr<DLLExportAttr>(); |
| 6027 | if (!Attr) |
| 6028 | continue; |
| 6029 | |
| 6030 | // If the class is non-dependent, mark the default arguments as ODR-used so |
| 6031 | // that we can properly codegen the constructor closure. |
| 6032 | if (!Class->isDependentContext()) { |
| 6033 | for (ParmVarDecl *PD : CD->parameters()) { |
| 6034 | (void)S.CheckCXXDefaultArgExpr(Attr->getLocation(), CD, PD); |
| 6035 | S.DiscardCleanupsInEvaluationContext(); |
| 6036 | } |
| 6037 | } |
| 6038 | |
| 6039 | if (LastExportedDefaultCtor) { |
| 6040 | S.Diag(LastExportedDefaultCtor->getLocation(), |
| 6041 | diag::err_attribute_dll_ambiguous_default_ctor) |
| 6042 | << Class; |
| 6043 | S.Diag(CD->getLocation(), diag::note_entity_declared_at) |
| 6044 | << CD->getDeclName(); |
| 6045 | return; |
| 6046 | } |
| 6047 | LastExportedDefaultCtor = CD; |
| 6048 | } |
| 6049 | } |
| 6050 | |
| 6051 | static void checkCUDADeviceBuiltinSurfaceClassTemplate(Sema &S, |
| 6052 | CXXRecordDecl *Class) { |
| 6053 | bool ErrorReported = false; |
| 6054 | auto reportIllegalClassTemplate = [&ErrorReported](Sema &S, |
| 6055 | ClassTemplateDecl *TD) { |
| 6056 | if (ErrorReported) |
| 6057 | return; |
| 6058 | S.Diag(TD->getLocation(), |
| 6059 | diag::err_cuda_device_builtin_surftex_cls_template) |
| 6060 | << /*surface*/ 0 << TD; |
| 6061 | ErrorReported = true; |
| 6062 | }; |
| 6063 | |
| 6064 | ClassTemplateDecl *TD = Class->getDescribedClassTemplate(); |
| 6065 | if (!TD) { |
| 6066 | auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(Class); |
| 6067 | if (!SD) { |
| 6068 | S.Diag(Class->getLocation(), |
| 6069 | diag::err_cuda_device_builtin_surftex_ref_decl) |
| 6070 | << /*surface*/ 0 << Class; |
| 6071 | S.Diag(Class->getLocation(), |
| 6072 | diag::note_cuda_device_builtin_surftex_should_be_template_class) |
| 6073 | << Class; |
| 6074 | return; |
| 6075 | } |
| 6076 | TD = SD->getSpecializedTemplate(); |
| 6077 | } |
| 6078 | |
| 6079 | TemplateParameterList *Params = TD->getTemplateParameters(); |
| 6080 | unsigned N = Params->size(); |
| 6081 | |
| 6082 | if (N != 2) { |
| 6083 | reportIllegalClassTemplate(S, TD); |
| 6084 | S.Diag(TD->getLocation(), |
| 6085 | diag::note_cuda_device_builtin_surftex_cls_should_have_n_args) |
| 6086 | << TD << 2; |
| 6087 | } |
| 6088 | if (N > 0 && !isa<TemplateTypeParmDecl>(Params->getParam(0))) { |
| 6089 | reportIllegalClassTemplate(S, TD); |
| 6090 | S.Diag(TD->getLocation(), |
| 6091 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) |
| 6092 | << TD << /*1st*/ 0 << /*type*/ 0; |
| 6093 | } |
| 6094 | if (N > 1) { |
| 6095 | auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(1)); |
| 6096 | if (!NTTP || !NTTP->getType()->isIntegralOrEnumerationType()) { |
| 6097 | reportIllegalClassTemplate(S, TD); |
| 6098 | S.Diag(TD->getLocation(), |
| 6099 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) |
| 6100 | << TD << /*2nd*/ 1 << /*integer*/ 1; |
| 6101 | } |
| 6102 | } |
| 6103 | } |
| 6104 | |
| 6105 | static void checkCUDADeviceBuiltinTextureClassTemplate(Sema &S, |
| 6106 | CXXRecordDecl *Class) { |
| 6107 | bool ErrorReported = false; |
| 6108 | auto reportIllegalClassTemplate = [&ErrorReported](Sema &S, |
| 6109 | ClassTemplateDecl *TD) { |
| 6110 | if (ErrorReported) |
| 6111 | return; |
| 6112 | S.Diag(TD->getLocation(), |
| 6113 | diag::err_cuda_device_builtin_surftex_cls_template) |
| 6114 | << /*texture*/ 1 << TD; |
| 6115 | ErrorReported = true; |
| 6116 | }; |
| 6117 | |
| 6118 | ClassTemplateDecl *TD = Class->getDescribedClassTemplate(); |
| 6119 | if (!TD) { |
| 6120 | auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(Class); |
| 6121 | if (!SD) { |
| 6122 | S.Diag(Class->getLocation(), |
| 6123 | diag::err_cuda_device_builtin_surftex_ref_decl) |
| 6124 | << /*texture*/ 1 << Class; |
| 6125 | S.Diag(Class->getLocation(), |
| 6126 | diag::note_cuda_device_builtin_surftex_should_be_template_class) |
| 6127 | << Class; |
| 6128 | return; |
| 6129 | } |
| 6130 | TD = SD->getSpecializedTemplate(); |
| 6131 | } |
| 6132 | |
| 6133 | TemplateParameterList *Params = TD->getTemplateParameters(); |
| 6134 | unsigned N = Params->size(); |
| 6135 | |
| 6136 | if (N != 3) { |
| 6137 | reportIllegalClassTemplate(S, TD); |
| 6138 | S.Diag(TD->getLocation(), |
| 6139 | diag::note_cuda_device_builtin_surftex_cls_should_have_n_args) |
| 6140 | << TD << 3; |
| 6141 | } |
| 6142 | if (N > 0 && !isa<TemplateTypeParmDecl>(Params->getParam(0))) { |
| 6143 | reportIllegalClassTemplate(S, TD); |
| 6144 | S.Diag(TD->getLocation(), |
| 6145 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) |
| 6146 | << TD << /*1st*/ 0 << /*type*/ 0; |
| 6147 | } |
| 6148 | if (N > 1) { |
| 6149 | auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(1)); |
| 6150 | if (!NTTP || !NTTP->getType()->isIntegralOrEnumerationType()) { |
| 6151 | reportIllegalClassTemplate(S, TD); |
| 6152 | S.Diag(TD->getLocation(), |
| 6153 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) |
| 6154 | << TD << /*2nd*/ 1 << /*integer*/ 1; |
| 6155 | } |
| 6156 | } |
| 6157 | if (N > 2) { |
| 6158 | auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(2)); |
| 6159 | if (!NTTP || !NTTP->getType()->isIntegralOrEnumerationType()) { |
| 6160 | reportIllegalClassTemplate(S, TD); |
| 6161 | S.Diag(TD->getLocation(), |
| 6162 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) |
| 6163 | << TD << /*3rd*/ 2 << /*integer*/ 1; |
| 6164 | } |
| 6165 | } |
| 6166 | } |
| 6167 | |
| 6168 | void Sema::checkClassLevelCodeSegAttribute(CXXRecordDecl *Class) { |
| 6169 | // Mark any compiler-generated routines with the implicit code_seg attribute. |
| 6170 | for (auto *Method : Class->methods()) { |
| 6171 | if (Method->isUserProvided()) |
| 6172 | continue; |
| 6173 | if (Attr *A = getImplicitCodeSegOrSectionAttrForFunction(Method, /*IsDefinition=*/true)) |
| 6174 | Method->addAttr(A); |
| 6175 | } |
| 6176 | } |
| 6177 | |
| 6178 | /// Check class-level dllimport/dllexport attribute. |
| 6179 | void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) { |
| 6180 | Attr *ClassAttr = getDLLAttr(Class); |
| 6181 | |
| 6182 | // MSVC inherits DLL attributes to partial class template specializations. |
| 6183 | if (Context.getTargetInfo().shouldDLLImportComdatSymbols() && !ClassAttr) { |
| 6184 | if (auto *Spec = dyn_cast<ClassTemplatePartialSpecializationDecl>(Class)) { |
| 6185 | if (Attr *TemplateAttr = |
| 6186 | getDLLAttr(Spec->getSpecializedTemplate()->getTemplatedDecl())) { |
| 6187 | auto *A = cast<InheritableAttr>(TemplateAttr->clone(getASTContext())); |
| 6188 | A->setInherited(true); |
| 6189 | ClassAttr = A; |
| 6190 | } |
| 6191 | } |
| 6192 | } |
| 6193 | |
| 6194 | if (!ClassAttr) |
| 6195 | return; |
| 6196 | |
| 6197 | if (!Class->isExternallyVisible()) { |
| 6198 | Diag(Class->getLocation(), diag::err_attribute_dll_not_extern) |
| 6199 | << Class << ClassAttr; |
| 6200 | return; |
| 6201 | } |
| 6202 | |
| 6203 | if (Context.getTargetInfo().shouldDLLImportComdatSymbols() && |
| 6204 | !ClassAttr->isInherited()) { |
| 6205 | // Diagnose dll attributes on members of class with dll attribute. |
| 6206 | for (Decl *Member : Class->decls()) { |
| 6207 | if (!isa<VarDecl>(Member) && !isa<CXXMethodDecl>(Member)) |
| 6208 | continue; |
| 6209 | InheritableAttr *MemberAttr = getDLLAttr(Member); |
| 6210 | if (!MemberAttr || MemberAttr->isInherited() || Member->isInvalidDecl()) |
| 6211 | continue; |
| 6212 | |
| 6213 | Diag(MemberAttr->getLocation(), |
| 6214 | diag::err_attribute_dll_member_of_dll_class) |
| 6215 | << MemberAttr << ClassAttr; |
| 6216 | Diag(ClassAttr->getLocation(), diag::note_previous_attribute); |
| 6217 | Member->setInvalidDecl(); |
| 6218 | } |
| 6219 | } |
| 6220 | |
| 6221 | if (Class->getDescribedClassTemplate()) |
| 6222 | // Don't inherit dll attribute until the template is instantiated. |
| 6223 | return; |
| 6224 | |
| 6225 | // The class is either imported or exported. |
| 6226 | const bool ClassExported = ClassAttr->getKind() == attr::DLLExport; |
| 6227 | |
| 6228 | // Check if this was a dllimport attribute propagated from a derived class to |
| 6229 | // a base class template specialization. We don't apply these attributes to |
| 6230 | // static data members. |
| 6231 | const bool PropagatedImport = |
| 6232 | !ClassExported && |
| 6233 | cast<DLLImportAttr>(ClassAttr)->wasPropagatedToBaseTemplate(); |
| 6234 | |
| 6235 | TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind(); |
| 6236 | |
| 6237 | // Ignore explicit dllexport on explicit class template instantiation |