[cfe-dev] libclang crashed on nullptr

[Nikola Smiljanic]

Can you try and reduce the preprocessed file?


On Fri, Aug 1, 2014 at 1:48 PM, Xavier Wang <weasley.wx at gmail.com> wrote:

> Hi,
>
> I have found a crash on nullptr when parse Qt header files.
>
> it caused by a dyn_cast on nullptr, at here (Line 9240 in SemaDecl.cpp):
>
> -------------------------
> /// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to
> perform
> /// any semantic actions necessary after any initializer has been attached.
> void
> Sema::FinalizeDeclaration(Decl *ThisDecl) {
>   // Note that we are no longer parsing the initializer for this
> declaration.
>   ParsingInitForAutoVars.erase(ThisDecl);
>
>   VarDecl *VD = dyn_cast_or_null<VarDecl>(ThisDecl);
>   if (!VD)
>     return;
>
>   checkAttributesAfterMerging(*this, *VD);
>
>   // Static locals inherit dll attributes from their function.
>   if (VD->isStaticLocal()) {
>     if (FunctionDecl *FD =
>             dyn_cast<FunctionDecl>(VD->getParentFunctionOrMethod())) {
> // !!!here!!!
> ------------------------
>
> maybe dyn_cast_or_null is needed? or is there something wrong with it?
>
> the source code is the preprocessed header file for Qt 5.2, it's
> 5.74MB+, So I can not upload it.
>
> the stack dump is:
>
> > libclang.dll!llvm::isa_impl_cl<clang::FunctionDecl,clang::DeclContext
> const *>::doit(const clang::DeclContext * Val) Line 94 C++
>   libclang.dll!llvm::isa_impl_wrap<clang::FunctionDecl,clang::DeclContext
> const *,clang::DeclContext const *>::doit(const clang::DeclContext *
> const & Val) Line 122 C++
>   libclang.dll!llvm::isa_impl_wrap<clang::FunctionDecl,clang::DeclContext
> * const,clang::DeclContext const *>::doit(clang::DeclContext * const &
> Val) Line 114 C++
>   libclang.dll!llvm::isa<clang::FunctionDecl,clang::DeclContext
> *>(clang::DeclContext * const & Val) Line 134 C++
>
> libclang.dll!llvm::dyn_cast<clang::FunctionDecl,clang::DeclContext>(clang::DeclContext
> * Val) Line 278 C++
>   libclang.dll!clang::Sema::FinalizeDeclaration(clang::Decl *
> ThisDecl) Line 9241 C++
>
> libclang.dll!clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier
> AS, clang::AttributeList * AccessAttrs, const
> clang::Parser::ParsedTemplateInfo & TemplateInfo,
> clang::ParsingDeclRAIIObject * TemplateDiags) Line 2380 C++
>   libclang.dll!clang::Parser::ParseSingleDeclarationAfterTemplate(unsigned
> int Context, const clang::Parser::ParsedTemplateInfo & TemplateInfo,
> clang::ParsingDeclRAIIObject & DiagsFromTParams, clang::SourceLocation
> & DeclEnd, clang::AccessSpecifier AS, clang::AttributeList *
> AccessAttrs) Line 173 C++
>
> libclang.dll!clang::Parser::ParseTemplateDeclarationOrSpecialization(unsigned
> int Context, clang::SourceLocation & DeclEnd, clang::AccessSpecifier
> AS, clang::AttributeList * AccessAttrs) Line 145 C++
>   libclang.dll!clang::Parser::ParseDeclarationStartingWithTemplate(unsigned
> int Context, clang::SourceLocation & DeclEnd, clang::AccessSpecifier
> AS, clang::AttributeList * AccessAttrs) Line 39 C++
>
> libclang.dll!clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier
> AS, clang::AttributeList * AccessAttrs, const
> clang::Parser::ParsedTemplateInfo & TemplateInfo,
> clang::ParsingDeclRAIIObject * TemplateDiags) Line 2083 C++
>
> libclang.dll!clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation
> RecordLoc, clang::SourceLocation AttrFixitLoc,
> clang::Parser::ParsedAttributesWithRange & Attrs, unsigned int
> TagType, clang::Decl * TagDecl) Line 2709 C++
>   libclang.dll!clang::Parser::ParseClassSpecifier(clang::tok::TokenKind
> TagTokKind, clang::SourceLocation StartLoc, clang::DeclSpec & DS,
> const clang::Parser::ParsedTemplateInfo & TemplateInfo,
> clang::AccessSpecifier AS, bool EnteringContext,
> clang::Parser::DeclSpecContext DSC,
> clang::Parser::ParsedAttributesWithRange & Attributes) Line 1639 C++
>   libclang.dll!clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec
> & DS, const clang::Parser::ParsedTemplateInfo & TemplateInfo,
> clang::AccessSpecifier AS, clang::Parser::DeclSpecContext DSContext,
> clang::Parser::LateParsedAttrList * LateAttrs) Line 3111 C++
>
> libclang.dll!clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange
> & attrs, clang::ParsingDeclSpec & DS, clang::AccessSpecifier AS) Line
> 836 C++
>
> libclang.dll!clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange
> & attrs, clang::ParsingDeclSpec * DS, clang::AccessSpecifier AS) Line
> 904 C++
>
> libclang.dll!clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange
> & attrs, clang::ParsingDeclSpec * DS) Line 762 C++
>
> libclang.dll!clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>
> & Result) Line 559 C++
>   libclang.dll!clang::ParseAST(clang::Sema & S, bool PrintStats, bool
> SkipFunctionBodies) Line 145 C++
>   libclang.dll!clang::ASTFrontendAction::ExecuteAction() Line 514 C++
>   libclang.dll!clang::FrontendAction::Execute() Line 415 C++
>   libclang.dll!clang::ASTUnit::Parse(llvm::MemoryBuffer *
> OverrideMainBuffer) Line 1152 C++
>   libclang.dll!clang::ASTUnit::LoadFromCompilerInvocation(bool
> PrecompilePreamble) Line 1915 C++
>   libclang.dll!clang::ASTUnit::LoadFromCommandLine(const char * *
> ArgBegin, const char * * ArgEnd,
> llvm::IntrusiveRefCntPtr<clang::DiagnosticsEngine> Diags,
> llvm::StringRef ResourceFilesPath, bool OnlyLocalDecls, bool
> CaptureDiagnostics,
>
> llvm::ArrayRef<std::pair<std::basic_string<char,std::char_traits<char>,std::allocator<char>
> >,llvm::MemoryBuffer *> > RemappedFiles, bool
> RemappedFilesKeepOriginalName, bool PrecompilePreamble,
> clang::TranslationUnitKind TUKind, bool CacheCodeCompletionResults,
> bool IncludeBriefCommentsInCodeCompletion, bool
> AllowPCHWithCompilerErrors, bool SkipFunctionBodies, bool
> UserFilesAreVolatile, bool ForSerialization,
> std::unique_ptr<clang::ASTUnit,std::default_delete<clang::ASTUnit> > *
> ErrAST) Line 2030 C++
>   libclang.dll!clang_parseTranslationUnit_Impl(void * UserData) Line 2925
> C++
>
> libclang.dll!llvm::CrashRecoveryContext::RunSafelyOnThread::__l3::<lambda>()
> Line 96 C++
>   libclang.dll!llvm::function_ref<void
> __cdecl(void)>::callback_fn<void <lambda>(void) >(int callable) Line
> 77 C++
>   libclang.dll!llvm::function_ref<void __cdecl(void)>::operator()() Line
> 85 C++
>   libclang.dll!llvm::function_ref<void
> __cdecl(void)>::callback_fn<llvm::function_ref<void __cdecl(void)>
> >(int callable) Line 77 C++
>   libclang.dll!llvm::function_ref<void __cdecl(void)>::operator()() Line
> 85 C++
>   libclang.dll!llvm::function_ref<void
> __cdecl(void)>::callback_fn<llvm::function_ref<void __cdecl(void)>
> >(int callable) Line 77 C++
>   libclang.dll!llvm::function_ref<void __cdecl(void)>::operator()() Line
> 85 C++
>
> libclang.dll!llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void
> __cdecl(void)> Fn) Line 319 C++
>   libclang.dll!RunSafelyOnThread_Dispatch(void * UserData) Line 366 C++
>   libclang.dll!ThreadCallback(void * param) Line 81 C++
>   [外部代码]
>   [下面的框架可能不正确和/或缺失，没有为 kernel32.dll 加载符号]
>
>
> Anyone can help me?
>
> --
> regards,
> Xavier Wang.
>
> _______________________________________________
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> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
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