2dd9b2717f
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@21322 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
398 lines
10 KiB
C++
398 lines
10 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: $Id$
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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 license
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/////////////////////////////////////////////////////////////////////////////
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#ifdef __GNUG__
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#pragma implementation "object.h"
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#endif
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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/hash.h"
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#endif
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#include <string.h>
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#if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
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#include "wx/memory.h"
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#endif
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#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
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// for wxObject::Dump
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#include "wx/ioswrap.h"
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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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wxClassInfo wxObject::sm_classwxObject( wxT("wxObject"), 0, 0,
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(int) sizeof(wxObject),
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(wxObjectConstructorFn) 0 );
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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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// These are here so we can avoid 'always true/false' warnings
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// by referring to these instead of TRUE/FALSE
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const bool wxTrue = TRUE;
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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 wxUSE_STD_IOSTREAM && (defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT)
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void wxObject::Dump(wxSTD ostream& str)
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{
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if (GetClassInfo() && GetClassInfo()->GetClassName())
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str << GetClassInfo()->GetClassName();
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else
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str << _T("unknown object class");
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}
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#endif
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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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}
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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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// a tiny InitializeClasses() helper
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/* static */
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inline wxClassInfo *wxClassInfo::GetBaseByName(const wxChar *name)
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{
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if ( !name )
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return NULL;
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wxClassInfo *classInfo = (wxClassInfo *)sm_classTable->Get(name);
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// this must be fixed, other things risk work wrongly later if you get this
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wxASSERT_MSG( classInfo,
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wxString::Format
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(
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_T("base class '%s' is unknown to wxWindows RTTI"),
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name
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) );
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return classInfo;
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}
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// Set pointers to base class(es) to speed up IsKindOf
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void wxClassInfo::InitializeClasses()
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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) will break this function
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// because it will enter an infinite loop and eventually die with "out of
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// memory" - as this is quite hard to detect if you're unaware of this,
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// try to do some checks here
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#ifdef __WXDEBUG__
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static const size_t nMaxClasses = 10000; // more than we'll ever have
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size_t nClass = 0;
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#endif
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sm_classTable = new wxHashTable(wxKEY_STRING);
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// Index all class infos by their class name
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wxClassInfo *info;
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for(info = sm_first; info; info = info->m_next)
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{
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if (info->m_className)
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{
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wxASSERT_MSG( ++nClass < nMaxClasses,
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_T("an infinite loop detected - have you used IMPLEMENT_DYNAMIC_CLASS() twice (may be by linking some object module(s) twice)?") );
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sm_classTable->Put(info->m_className, (wxObject *)info);
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}
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}
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// Set base pointers for each wxClassInfo
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for(info = sm_first; info; info = info->m_next)
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{
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info->m_baseInfo1 = GetBaseByName(info->GetBaseClassName1());
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info->m_baseInfo2 = GetBaseByName(info->GetBaseClassName2());
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}
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}
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void wxClassInfo::CleanUpClasses()
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{
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delete wxClassInfo::sm_classTable;
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wxClassInfo::sm_classTable = NULL;
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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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// Initialize ref data from another object (needed for copy constructor and
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// assignment operator)
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void wxObject::InitFrom(const wxObject& other)
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{
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m_refData = other.m_refData;
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if ( m_refData )
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m_refData->m_count++;
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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 )
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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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// ----------------------------------------------------------------------------
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// misc
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// ----------------------------------------------------------------------------
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#if defined(__DARWIN__) && defined(WXMAKINGDLL)
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extern "C" {
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void __initialize_Cplusplus(void);
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void wxWindowsDylibInit(void);
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};
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// Dynamic shared library (dylib) initialization routine
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// required to initialize static C++ objects bacause of lazy dynamic linking
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// http://developer.apple.com/techpubs/macosx/Essentials/
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// SystemOverview/Frameworks/Dynamic_Shared_Libraries.html
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void wxWindowsDylibInit()
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{
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// The function __initialize_Cplusplus() must be called from the shared
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// library initialization routine to cause the static C++ objects in
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// the library to be initialized (reference number 2441683).
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// This only seems to be necessary if the library initialization routine
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// needs to use the static C++ objects
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__initialize_Cplusplus();
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}
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#endif
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// vi:sts=4:sw=4:et
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