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