X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/303c6f20d21a99cc421c80ed7b50193e5e0762d8..a987bdfa2209f394a62dbd187c6149b3b8a2e3d9:/src/common/object.cpp diff --git a/src/common/object.cpp b/src/common/object.cpp index 67e60c8551..05d4dd13b7 100644 --- a/src/common/object.cpp +++ b/src/common/object.cpp @@ -26,14 +26,14 @@ #include -#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT +#if wxUSE_DEBUG_CONTEXT #if defined(__VISAGECPP__) #define DEBUG_PRINTF(NAME) { static int raz=0; \ printf( #NAME " %i\n",raz); fflush(stdout); raz++; } #else #define DEBUG_PRINTF(NAME) #endif -#endif // __WXDEBUG__ || wxUSE_DEBUG_CONTEXT +#endif // wxUSE_DEBUG_CONTEXT // we must disable optimizations for VC.NET because otherwise its too eager // linker discards wxClassInfo objects in release build thus breaking many, @@ -53,12 +53,12 @@ const wxClassInfo* wxObject::ms_classParents[] = { NULL } ; wxClassInfo wxObject::ms_classInfo(ms_classParents , wxEmptyString , wxT("wxObject"), (int) sizeof(wxObject), \ (wxObjectConstructorFn) 0 , - (wxPropertyInfo*) NULL,(wxHandlerInfo*) NULL,0 , 0 , + NULL,NULL,0 , 0 , 0 , wxVariantOfPtrToObjectConverterwxObject , wxVariantToObjectConverterwxObject , wxObjectToVariantConverterwxObject); - template<> void wxStringReadValue(const wxString & , wxObject * & ){assert(0) ;} - template<> void wxStringWriteValue(wxString & , wxObject* const & ){assert(0) ;} - template<> void wxStringReadValue(const wxString & , wxObject & ){assert(0) ;} - template<> void wxStringWriteValue(wxString & , wxObject const & ){assert(0) ;} + template<> void wxStringReadValue(const wxString & , wxObject * & ){ wxFAIL_MSG("unreachable"); } + template<> void wxStringWriteValue(wxString & , wxObject* const & ){ wxFAIL_MSG("unreachable"); } + template<> void wxStringReadValue(const wxString & , wxObject & ){ wxFAIL_MSG("unreachable"); } + template<> void wxStringWriteValue(wxString & , wxObject const & ){ wxFAIL_MSG("unreachable"); } wxClassTypeInfo s_typeInfo(wxT_OBJECT_PTR , &wxObject::ms_classInfo , NULL , NULL , typeid(wxObject*).name() ) ; wxClassTypeInfo s_typeInfowxObject(wxT_OBJECT , &wxObject::ms_classInfo , NULL , NULL , typeid(wxObject).name() ) ; #else @@ -103,7 +103,7 @@ bool wxObject::IsKindOf(const wxClassInfo *info) const return (thisInfo) ? thisInfo->IsKindOf(info) : false ; } -#if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING && defined( new ) +#if wxUSE_MEMORY_TRACING && defined( new ) #undef new #endif @@ -206,49 +206,74 @@ wxClassInfo *wxClassInfo::FindClass(const wxString& className) } } -// This function wasn't written to be reentrant but there is a possiblity of -// reentrance if something it does causes a shared lib to load and register -// classes. On Solaris this happens when the wxHashTable is newed, so the first -// part of the function has been modified to handle it, and a wxASSERT checks -// against reentrance in the remainder of the function. +// Reentrance can occur on some platforms (Solaris for one), as the use of hash +// and string objects can cause other modules to load and register classes +// before the original call returns. This is handled by keeping the hash table +// local when it is first created and only assigning it to the global variable +// when the function is ready to return. +// +// That does make the assumption that after the function has completed the +// first time the problem will no longer happen; all the modules it depends on +// will have been loaded. The assumption is checked using the 'entry' variable +// as a reentrance guard, it checks that once the hash table is global it is +// not accessed multiple times simulateously. void wxClassInfo::Register() { +#if wxDEBUG_LEVEL + // reentrance guard - see note above + static int entry = 0; +#endif // wxDEBUG_LEVEL + + wxHashTable *classTable; + if ( !sm_classTable ) { - wxHashTable *classTable = new wxHashTable(wxKEY_STRING); - - // check for reentrance - if ( sm_classTable ) - delete classTable; - else - sm_classTable = classTable; + // keep the hash local initially, reentrance is possible + classTable = new wxHashTable(wxKEY_STRING); + } + else + { + // guard againt reentrance once the global has been created + wxASSERT_MSG(++entry == 1, wxT("wxClassInfo::Register() reentrance")); + classTable = sm_classTable; } - -#ifdef __WXDEBUG__ - // reentrance guard - see note above - static int entry = 0; - wxASSERT_MSG(++entry == 1, _T("wxClassInfo::Register() reentrance")); -#endif // Using IMPLEMENT_DYNAMIC_CLASS() macro twice (which may happen if you // link any object module twice mistakenly, or link twice against wx shared // library) will break this function because it will enter an infinite loop // and eventually die with "out of memory" - as this is quite hard to // detect if you're unaware of this, try to do some checks here. - wxASSERT_MSG( sm_classTable->Get(m_className) == NULL, + wxASSERT_MSG( classTable->Get(m_className) == NULL, wxString::Format ( - _T("Class \"%s\" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?"), + wxT("Class \"%s\" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?"), m_className ) ); - sm_classTable->Put(m_className, (wxObject *)this); + classTable->Put(m_className, (wxObject *)this); -#ifdef __WXDEBUG__ - --entry; -#endif + // if we're using a local hash we need to try to make it global + if ( sm_classTable != classTable ) + { + if ( !sm_classTable ) + { + // make the hash global + sm_classTable = classTable; + } + else + { + // the gobal hash has already been created by a reentrant call, + // so delete the local hash and try again + delete classTable; + Register(); + } + } + +#if wxDEBUG_LEVEL + entry = 0; +#endif // wxDEBUG_LEVEL } void wxClassInfo::Unregister() @@ -258,15 +283,14 @@ void wxClassInfo::Unregister() sm_classTable->Delete(m_className); if ( sm_classTable->GetCount() == 0 ) { - delete sm_classTable; - sm_classTable = NULL; + wxDELETE(sm_classTable); } } } wxObject *wxCreateDynamicObject(const wxString& name) { -#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT +#if wxUSE_DEBUG_CONTEXT DEBUG_PRINTF(wxObject *wxCreateDynamicObject) #endif @@ -325,8 +349,10 @@ wxClassInfo::const_iterator wxClassInfo::end_classinfo() // wxObjectRefData // ---------------------------------------------------------------------------- -void wxObjectRefData::DecRef() +void wxRefCounter::DecRef() { + wxASSERT_MSG( m_count > 0, "invalid ref data count" ); + if ( --m_count == 0 ) delete this; } @@ -338,7 +364,7 @@ void wxObjectRefData::DecRef() void wxObject::Ref(const wxObject& clone) { -#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT +#if wxUSE_DEBUG_CONTEXT DEBUG_PRINTF(wxObject::Ref) #endif @@ -361,8 +387,6 @@ void wxObject::UnRef() { if ( m_refData ) { - wxASSERT_MSG( m_refData->m_count > 0, _T("invalid ref data count") ); - m_refData->DecRef(); m_refData = NULL; } @@ -386,13 +410,13 @@ void wxObject::AllocExclusive() //else: ref count is 1, we are exclusive owners of m_refData anyhow wxASSERT_MSG( m_refData && m_refData->GetRefCount() == 1, - _T("wxObject::AllocExclusive() failed.") ); + wxT("wxObject::AllocExclusive() failed.") ); } wxObjectRefData *wxObject::CreateRefData() const { // if you use AllocExclusive() you must override this method - wxFAIL_MSG( _T("CreateRefData() must be overridden if called!") ); + wxFAIL_MSG( wxT("CreateRefData() must be overridden if called!") ); return NULL; } @@ -401,7 +425,7 @@ wxObjectRefData * wxObject::CloneRefData(const wxObjectRefData * WXUNUSED(data)) const { // if you use AllocExclusive() you must override this method - wxFAIL_MSG( _T("CloneRefData() must be overridden if called!") ); + wxFAIL_MSG( wxT("CloneRefData() must be overridden if called!") ); return NULL; }