391 lines
12 KiB
C++
391 lines
12 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: src/common/object.cpp
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// Purpose: wxObject implementation
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// Author: Julian Smart
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// Modified by: Ron Lee
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// Created: 04/01/98
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// RCS-ID: $Id: object.cpp 56500 2008-10-23 14:48:31Z MW $
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// Copyright: (c) 1998 Julian Smart
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// (c) 2001 Ron Lee <ron@debian.org>
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#ifndef WX_PRECOMP
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#include "wx/object.h"
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#include "wx/hash.h"
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#include "wx/memory.h"
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#endif
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#include <string.h>
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#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
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#if defined(__VISAGECPP__)
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#define DEBUG_PRINTF(NAME) { static int raz=0; \
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printf( #NAME " %i\n",raz); fflush(stdout); raz++; }
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#else
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#define DEBUG_PRINTF(NAME)
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#endif
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#endif // __WXDEBUG__ || wxUSE_DEBUG_CONTEXT
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// we must disable optimizations for VC.NET because otherwise its too eager
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// linker discards wxClassInfo objects in release build thus breaking many,
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// many things
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#if defined __VISUALC__ && __VISUALC__ >= 1300
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#pragma optimize("", off)
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#endif
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#if wxUSE_EXTENDED_RTTI
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const wxClassInfo* wxObject::ms_classParents[] = { NULL } ;
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wxObject* wxVariantToObjectConverterwxObject ( wxxVariant &data )
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{ return data.wxTEMPLATED_MEMBER_CALL(Get , wxObject*) ; }
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wxObject* wxVariantOfPtrToObjectConverterwxObject ( wxxVariant &data )
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{ return &data.wxTEMPLATED_MEMBER_CALL(Get , wxObject) ; }
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wxxVariant wxObjectToVariantConverterwxObject ( wxObject *data )
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{ return wxxVariant( dynamic_cast<wxObject*> (data) ) ; }
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wxClassInfo wxObject::ms_classInfo(ms_classParents , wxEmptyString , wxT("wxObject"),
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(int) sizeof(wxObject), \
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(wxObjectConstructorFn) 0 ,
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(wxPropertyInfo*) NULL,(wxHandlerInfo*) NULL,0 , 0 ,
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0 , wxVariantOfPtrToObjectConverterwxObject , wxVariantToObjectConverterwxObject , wxObjectToVariantConverterwxObject);
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template<> void wxStringReadValue(const wxString & , wxObject * & ){assert(0) ;}
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template<> void wxStringWriteValue(wxString & , wxObject* const & ){assert(0) ;}
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template<> void wxStringReadValue(const wxString & , wxObject & ){assert(0) ;}
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template<> void wxStringWriteValue(wxString & , wxObject const & ){assert(0) ;}
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wxClassTypeInfo s_typeInfo(wxT_OBJECT_PTR , &wxObject::ms_classInfo , NULL , NULL , typeid(wxObject*).name() ) ;
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wxClassTypeInfo s_typeInfowxObject(wxT_OBJECT , &wxObject::ms_classInfo , NULL , NULL , typeid(wxObject).name() ) ;
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#else
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wxClassInfo wxObject::ms_classInfo( wxT("wxObject"), 0, 0,
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(int) sizeof(wxObject),
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(wxObjectConstructorFn) 0 );
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#endif
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// restore optimizations
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#if defined __VISUALC__ && __VISUALC__ >= 1300
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#pragma optimize("", on)
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#endif
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wxClassInfo* wxClassInfo::sm_first = NULL;
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wxHashTable* wxClassInfo::sm_classTable = NULL;
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// when using XTI, this method is already implemented inline inside
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// DECLARE_DYNAMIC_CLASS but otherwise we intentionally make this function
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// non-inline because this allows us to have a non-inline virtual function in
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// all wx classes and this solves linking problems for HP-UX native toolchain
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// and possibly others (we could make dtor non-inline as well but it's more
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// useful to keep it inline than this function)
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#if !wxUSE_EXTENDED_RTTI
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wxClassInfo *wxObject::GetClassInfo() const
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{
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return &wxObject::ms_classInfo;
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}
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#endif // wxUSE_EXTENDED_RTTI
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// this variable exists only so that we can avoid 'always true/false' warnings
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const bool wxFalse = false;
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// Is this object a kind of (a subclass of) 'info'?
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// E.g. is wxWindow a kind of wxObject?
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// Go from this class to superclass, taking into account
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// two possible base classes.
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bool wxObject::IsKindOf(wxClassInfo *info) const
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{
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wxClassInfo *thisInfo = GetClassInfo();
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return (thisInfo) ? thisInfo->IsKindOf(info) : false ;
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}
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#if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING && defined( new )
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#undef new
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#endif
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#ifdef _WX_WANT_NEW_SIZET_WXCHAR_INT
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void *wxObject::operator new ( size_t size, const wxChar *fileName, int lineNum )
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{
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return wxDebugAlloc(size, (wxChar*) fileName, lineNum, true);
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}
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#endif
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#ifdef _WX_WANT_DELETE_VOID
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void wxObject::operator delete ( void *buf )
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{
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wxDebugFree(buf);
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}
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#endif
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#ifdef _WX_WANT_DELETE_VOID_CONSTCHAR_SIZET
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void wxObject::operator delete ( void *buf, const char *_fname, size_t _line )
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{
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wxDebugFree(buf);
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}
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#endif
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#ifdef _WX_WANT_DELETE_VOID_WXCHAR_INT
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void wxObject::operator delete ( void *buf, const wxChar *WXUNUSED(fileName), int WXUNUSED(lineNum) )
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{
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wxDebugFree(buf);
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}
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#endif
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#ifdef _WX_WANT_ARRAY_NEW_SIZET_WXCHAR_INT
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void *wxObject::operator new[] ( size_t size, const wxChar* fileName, int lineNum )
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{
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return wxDebugAlloc(size, (wxChar*) fileName, lineNum, true, true);
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}
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#endif
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#ifdef _WX_WANT_ARRAY_DELETE_VOID
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void wxObject::operator delete[] ( void *buf )
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{
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wxDebugFree(buf, true);
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}
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#endif
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#ifdef _WX_WANT_ARRAY_DELETE_VOID_WXCHAR_INT
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void wxObject::operator delete[] (void * buf, const wxChar* WXUNUSED(fileName), int WXUNUSED(lineNum) )
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{
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wxDebugFree(buf, true);
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}
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#endif
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// ----------------------------------------------------------------------------
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// wxClassInfo
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// ----------------------------------------------------------------------------
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wxClassInfo::~wxClassInfo()
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{
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// remove this object from the linked list of all class infos: if we don't
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// do it, loading/unloading a DLL containing static wxClassInfo objects is
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// not going to work
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if ( this == sm_first )
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{
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sm_first = m_next;
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}
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else
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{
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wxClassInfo *info = sm_first;
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while (info)
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{
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if ( info->m_next == this )
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{
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info->m_next = m_next;
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break;
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}
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info = info->m_next;
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}
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}
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Unregister();
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}
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wxClassInfo *wxClassInfo::FindClass(const wxChar *className)
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{
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if ( sm_classTable )
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{
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return (wxClassInfo *)wxClassInfo::sm_classTable->Get(className);
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}
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else
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{
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for ( wxClassInfo *info = sm_first; info ; info = info->m_next )
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{
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if ( wxStrcmp(info->GetClassName(), className) == 0 )
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return info;
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}
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return NULL;
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}
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}
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// Reentrance can occur on some platforms (Solaris for one), as the use of hash
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// and string objects can cause other modules to load and register classes
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// before the original call returns. This is handled by keeping the hash table
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// local when it is first created and only assigning it to the global variable
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// when the function is ready to return.
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//
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// That does make the assumption that after the function has completed the
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// first time the problem will no longer happen; all the modules it depends on
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// will have been loaded. The assumption is checked using the 'entry' variable
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// as a reentrance guard, it checks that once the hash table is global it is
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// not accessed multiple times simulateously.
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void wxClassInfo::Register()
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{
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#ifdef __WXDEBUG__
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// reentrance guard - see note above
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static int entry = 0;
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#endif
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wxHashTable *classTable;
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if ( !sm_classTable )
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{
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// keep the hash local initially, reentrance is possible
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classTable = new wxHashTable(wxKEY_STRING);
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}
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else
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{
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// guard againt reentrance once the global has been created
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wxASSERT_MSG(++entry == 1, _T("wxClassInfo::Register() reentrance"));
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classTable = sm_classTable;
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}
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// Using IMPLEMENT_DYNAMIC_CLASS() macro twice (which may happen if you
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// link any object module twice mistakenly, or link twice against wx shared
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// library) will break this function because it will enter an infinite loop
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// and eventually die with "out of memory" - as this is quite hard to
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// detect if you're unaware of this, try to do some checks here.
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wxASSERT_MSG( classTable->Get(m_className) == NULL,
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wxString::Format
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(
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_T("Class \"%s\" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?"),
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m_className
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)
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);
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classTable->Put(m_className, (wxObject *)this);
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// if we're using a local hash we need to try to make it global
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if ( sm_classTable != classTable )
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{
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if ( !sm_classTable )
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{
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// make the hash global
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sm_classTable = classTable;
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}
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else
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{
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// the gobal hash has already been created by a reentrant call,
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// so delete the local hash and try again
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delete classTable;
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Register();
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}
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}
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#ifdef __WXDEBUG__
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entry = 0;
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#endif
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}
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void wxClassInfo::Unregister()
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{
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if ( sm_classTable )
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{
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sm_classTable->Delete(m_className);
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if ( sm_classTable->GetCount() == 0 )
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{
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delete sm_classTable;
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sm_classTable = NULL;
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}
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}
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}
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wxObject *wxCreateDynamicObject(const wxChar *name)
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{
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#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
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DEBUG_PRINTF(wxObject *wxCreateDynamicObject)
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#endif
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if ( wxClassInfo::sm_classTable )
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{
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wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);
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return info ? info->CreateObject() : NULL;
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}
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else // no sm_classTable yet
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{
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for ( wxClassInfo *info = wxClassInfo::sm_first;
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info;
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info = info->m_next )
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{
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if (info->m_className && wxStrcmp(info->m_className, name) == 0)
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return info->CreateObject();
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}
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return NULL;
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}
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}
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// ----------------------------------------------------------------------------
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// wxObject
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// ----------------------------------------------------------------------------
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void wxObject::Ref(const wxObject& clone)
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{
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#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
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DEBUG_PRINTF(wxObject::Ref)
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#endif
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// nothing to be done
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if (m_refData == clone.m_refData)
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return;
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// delete reference to old data
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UnRef();
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// reference new data
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if ( clone.m_refData )
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{
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m_refData = clone.m_refData;
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++(m_refData->m_count);
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}
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}
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void wxObject::UnRef()
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{
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if ( m_refData )
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{
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wxASSERT_MSG( m_refData->m_count > 0, _T("invalid ref data count") );
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if ( --m_refData->m_count == 0 )
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delete m_refData;
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m_refData = NULL;
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}
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}
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void wxObject::AllocExclusive()
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{
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if ( !m_refData )
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{
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m_refData = CreateRefData();
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}
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else if ( m_refData->GetRefCount() > 1 )
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{
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// note that ref is not going to be destroyed in this case
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const wxObjectRefData* ref = m_refData;
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UnRef();
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// ... so we can still access it
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m_refData = CloneRefData(ref);
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}
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//else: ref count is 1, we are exclusive owners of m_refData anyhow
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wxASSERT_MSG( m_refData && m_refData->GetRefCount() == 1,
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_T("wxObject::AllocExclusive() failed.") );
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}
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wxObjectRefData *wxObject::CreateRefData() const
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{
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// if you use AllocExclusive() you must override this method
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wxFAIL_MSG( _T("CreateRefData() must be overridden if called!") );
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return NULL;
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}
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wxObjectRefData *
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wxObject::CloneRefData(const wxObjectRefData * WXUNUSED(data)) const
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{
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// if you use AllocExclusive() you must override this method
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wxFAIL_MSG( _T("CloneRefData() must be overridden if called!") );
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return NULL;
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}
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