src/common/object.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/object.cpp
   3 // Purpose:     wxObject implementation
   4 // Author:      Julian Smart
   5 // Modified by: Ron Lee
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Julian Smart
   9 //              (c) 2001 Ron Lee <ron@debian.org>
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 // For compilers that support precompilation, includes "wx.h".
  14 #include "wx/wxprec.h"
  15
  16 #ifdef __BORLANDC__
  17 #pragma hdrstop
  18 #endif
  19
  20 #ifndef WX_PRECOMP
  21     #include "wx/hash.h"
  22     #include "wx/object.h"
  23 #endif
  24
  25 #include <string.h>
  26
  27 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
  28 #include "wx/memory.h"
  29 #endif
  30
  31 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
  32     #if defined(__VISAGECPP__)
  33         #define DEBUG_PRINTF(NAME) { static int raz=0; \
  34             printf( #NAME " %i\n",raz); fflush(stdout); raz++; }
  35     #else
  36         #define DEBUG_PRINTF(NAME)
  37     #endif
  38 #endif // __WXDEBUG__ || wxUSE_DEBUG_CONTEXT
  39
  40 // we must disable optimizations for VC.NET because otherwise its too eager
  41 // linker discards wxClassInfo objects in release build thus breaking many,
  42 // many things
  43 #if defined __VISUALC__ && __VISUALC__ >= 1300
  44     #pragma optimize("", off)
  45 #endif
  46
  47 #if wxUSE_EXTENDED_RTTI
  48 const wxClassInfo* wxObject::ms_classParents[] = { NULL } ;
  49  wxObject* wxVariantToObjectConverterwxObject ( wxxVariant &data )
  50 { return data.wxTEMPLATED_MEMBER_CALL(Get , wxObject*) ; }
  51  wxObject* wxVariantOfPtrToObjectConverterwxObject ( wxxVariant &data )
  52 { return &data.wxTEMPLATED_MEMBER_CALL(Get , wxObject) ; }
  53  wxxVariant wxObjectToVariantConverterwxObject ( wxObject *data )
  54  { return wxxVariant( dynamic_cast<wxObject*> (data)  ) ; }
  55  wxClassInfo wxObject::ms_classInfo(ms_classParents , wxEmptyString , wxT("wxObject"),
  56             (int) sizeof(wxObject),                              \
  57             (wxObjectConstructorFn) 0   ,
  58             (wxPropertyInfo*) NULL,(wxHandlerInfo*) NULL,0 , 0 ,
  59             0 , wxVariantOfPtrToObjectConverterwxObject , wxVariantToObjectConverterwxObject , wxObjectToVariantConverterwxObject);
  60  template<> void wxStringReadValue(const wxString & , wxObject * & ){assert(0) ;}
  61  template<> void wxStringWriteValue(wxString & , wxObject* const & ){assert(0) ;}
  62  template<> void wxStringReadValue(const wxString & , wxObject & ){assert(0) ;}
  63  template<> void wxStringWriteValue(wxString & , wxObject const & ){assert(0) ;}
  64  wxClassTypeInfo s_typeInfo(wxT_OBJECT_PTR , &wxObject::ms_classInfo , NULL , NULL , typeid(wxObject*).name() ) ;
  65  wxClassTypeInfo s_typeInfowxObject(wxT_OBJECT , &wxObject::ms_classInfo , NULL , NULL , typeid(wxObject).name() ) ;
  66 #else
  67 wxClassInfo wxObject::ms_classInfo( wxT("wxObject"), 0, 0,
  68                                         (int) sizeof(wxObject),
  69                                         (wxObjectConstructorFn) 0 );
  70 #endif
  71
  72 // restore optimizations
  73 #if defined __VISUALC__ && __VISUALC__ >= 1300
  74     #pragma optimize("", on)
  75 #endif
  76
  77 wxClassInfo* wxClassInfo::sm_first = NULL;
  78 wxHashTable* wxClassInfo::sm_classTable = NULL;
  79
  80 // when using XTI, this method is already implemented inline inside
  81 // DECLARE_DYNAMIC_CLASS but otherwise we intentionally make this function
  82 // non-inline because this allows us to have a non-inline virtual function in
  83 // all wx classes and this solves linking problems for HP-UX native toolchain
  84 // and possibly others (we could make dtor non-inline as well but it's more
  85 // useful to keep it inline than this function)
  86 #if !wxUSE_EXTENDED_RTTI
  87
  88 wxClassInfo *wxObject::GetClassInfo() const
  89 {
  90     return &wxObject::ms_classInfo;
  91 }
  92
  93 #endif // wxUSE_EXTENDED_RTTI
  94
  95 // this variable exists only so that we can avoid 'always true/false' warnings
  96 const bool wxFalse = false;
  97
  98 // Is this object a kind of (a subclass of) 'info'?
  99 // E.g. is wxWindow a kind of wxObject?
 100 // Go from this class to superclass, taking into account
 101 // two possible base classes.
 102 bool wxObject::IsKindOf(wxClassInfo *info) const
 103 {
 104     wxClassInfo *thisInfo = GetClassInfo();
 105     return (thisInfo) ? thisInfo->IsKindOf(info) : false ;
 106 }
 107
 108 #if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING && defined( new )
 109     #undef new
 110 #endif
 111
 112
 113 #ifdef _WX_WANT_NEW_SIZET_WXCHAR_INT
 114 void *wxObject::operator new ( size_t size, const wxChar *fileName, int lineNum )
 115 {
 116     return wxDebugAlloc(size, (wxChar*) fileName, lineNum, true);
 117 }
 118 #endif
 119
 120 #ifdef _WX_WANT_DELETE_VOID
 121 void wxObject::operator delete ( void *buf )
 122 {
 123     wxDebugFree(buf);
 124 }
 125 #endif
 126
 127 #ifdef _WX_WANT_DELETE_VOID_CONSTCHAR_SIZET
 128 void wxObject::operator delete ( void *buf, const char *_fname, size_t _line )
 129 {
 130     wxDebugFree(buf);
 131 }
 132 #endif
 133
 134 #ifdef _WX_WANT_DELETE_VOID_WXCHAR_INT
 135 void wxObject::operator delete ( void *buf, const wxChar *WXUNUSED(fileName), int WXUNUSED(lineNum) )
 136 {
 137      wxDebugFree(buf);
 138 }
 139 #endif
 140
 141 #ifdef _WX_WANT_ARRAY_NEW_SIZET_WXCHAR_INT
 142 void *wxObject::operator new[] ( size_t size, const wxChar* fileName, int lineNum )
 143 {
 144     return wxDebugAlloc(size, (wxChar*) fileName, lineNum, true, true);
 145 }
 146 #endif
 147
 148 #ifdef _WX_WANT_ARRAY_DELETE_VOID
 149 void wxObject::operator delete[] ( void *buf )
 150 {
 151     wxDebugFree(buf, true);
 152 }
 153 #endif
 154
 155 #ifdef _WX_WANT_ARRAY_DELETE_VOID_WXCHAR_INT
 156 void wxObject::operator delete[] (void * buf, const wxChar*  WXUNUSED(fileName), int WXUNUSED(lineNum) )
 157 {
 158     wxDebugFree(buf, true);
 159 }
 160 #endif
 161
 162
 163 // ----------------------------------------------------------------------------
 164 // wxClassInfo
 165 // ----------------------------------------------------------------------------
 166
 167 wxClassInfo::~wxClassInfo()
 168 {
 169     // remove this object from the linked list of all class infos: if we don't
 170     // do it, loading/unloading a DLL containing static wxClassInfo objects is
 171     // not going to work
 172     if ( this == sm_first )
 173     {
 174         sm_first = m_next;
 175     }
 176     else
 177     {
 178         wxClassInfo *info = sm_first;
 179         while (info)
 180         {
 181             if ( info->m_next == this )
 182             {
 183                 info->m_next = m_next;
 184                 break;
 185             }
 186
 187             info = info->m_next;
 188         }
 189     }
 190     Unregister();
 191 }
 192
 193 wxClassInfo *wxClassInfo::FindClass(const wxChar *className)
 194 {
 195     if ( sm_classTable )
 196     {
 197         return (wxClassInfo *)wxClassInfo::sm_classTable->Get(className);
 198     }
 199     else
 200     {
 201         for ( wxClassInfo *info = sm_first; info ; info = info->m_next )
 202         {
 203             if ( wxStrcmp(info->GetClassName(), className) == 0 )
 204                 return info;
 205         }
 206
 207         return NULL;
 208     }
 209 }
 210
 211 void wxClassInfo::Register()
 212 {
 213     if ( !sm_classTable )
 214     {
 215         sm_classTable = new wxHashTable(wxKEY_STRING);
 216     }
 217
 218     // Using IMPLEMENT_DYNAMIC_CLASS() macro twice (which may happen if you
 219     // link any object module twice mistakenly, or link twice against wx shared
 220     // library) will break this function because it will enter an infinite loop
 221     // and eventually die with "out of memory" - as this is quite hard to
 222     // detect if you're unaware of this, try to do some checks here.
 223     wxASSERT_MSG( sm_classTable->Get(m_className) == NULL,
 224         wxString::Format
 225         (
 226             _T("Class \"%s\" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?"),
 227             m_className
 228         )
 229     );
 230
 231     sm_classTable->Put(m_className, (wxObject *)this);
 232 }
 233
 234 void wxClassInfo::Unregister()
 235 {
 236     if ( sm_classTable )
 237     {
 238         sm_classTable->Delete(m_className);
 239         if ( sm_classTable->GetCount() == 0 )
 240         {
 241             delete sm_classTable;
 242             sm_classTable = NULL;
 243         }
 244     }
 245 }
 246
 247 wxObject *wxCreateDynamicObject(const wxChar *name)
 248 {
 249 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
 250     DEBUG_PRINTF(wxObject *wxCreateDynamicObject)
 251 #endif
 252
 253     if ( wxClassInfo::sm_classTable )
 254     {
 255         wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);
 256         return info ? info->CreateObject() : NULL;
 257     }
 258     else // no sm_classTable yet
 259     {
 260         for ( wxClassInfo *info = wxClassInfo::sm_first;
 261               info;
 262               info = info->m_next )
 263         {
 264             if (info->m_className && wxStrcmp(info->m_className, name) == 0)
 265                 return info->CreateObject();
 266         }
 267
 268         return NULL;
 269     }
 270 }
 271
 272
 273 // ----------------------------------------------------------------------------
 274 // wxObject
 275 // ----------------------------------------------------------------------------
 276
 277 void wxObject::Ref(const wxObject& clone)
 278 {
 279 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
 280     DEBUG_PRINTF(wxObject::Ref)
 281 #endif
 282
 283     // nothing to be done
 284     if (m_refData == clone.m_refData)
 285         return;
 286
 287     // delete reference to old data
 288     UnRef();
 289
 290     // reference new data
 291     if ( clone.m_refData )
 292     {
 293         m_refData = clone.m_refData;
 294         ++(m_refData->m_count);
 295     }
 296 }
 297
 298 void wxObject::UnRef()
 299 {
 300     if ( m_refData )
 301     {
 302         wxASSERT_MSG( m_refData->m_count > 0, _T("invalid ref data count") );
 303
 304         if ( --m_refData->m_count == 0 )
 305             delete m_refData;
 306         m_refData = NULL;
 307     }
 308 }
 309
 310 void wxObject::AllocExclusive()
 311 {
 312     if ( !m_refData )
 313     {
 314         m_refData = CreateRefData();
 315     }
 316     else if ( m_refData->GetRefCount() > 1 )
 317     {
 318         // note that ref is not going to be destroyed in this case
 319         const wxObjectRefData* ref = m_refData;
 320         UnRef();
 321
 322         // ... so we can still access it
 323         m_refData = CloneRefData(ref);
 324     }
 325     //else: ref count is 1, we are exclusive owners of m_refData anyhow
 326
 327     wxASSERT_MSG( m_refData && m_refData->GetRefCount() == 1,
 328                   _T("wxObject::AllocExclusive() failed.") );
 329 }
 330
 331 wxObjectRefData *wxObject::CreateRefData() const
 332 {
 333     // if you use AllocExclusive() you must override this method
 334     wxFAIL_MSG( _T("CreateRefData() must be overridden if called!") );
 335
 336     return NULL;
 337 }
 338
 339 wxObjectRefData *
 340 wxObject::CloneRefData(const wxObjectRefData * WXUNUSED(data)) const
 341 {
 342     // if you use AllocExclusive() you must override this method
 343     wxFAIL_MSG( _T("CloneRefData() must be overridden if called!") );
 344
 345     return NULL;
 346 }