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 #ifdef __GNUG__
  14 #pragma implementation "object.h"
  15 #endif
  16
  17 // For compilers that support precompilation, includes "wx.h".
  18 #include "wx/wxprec.h"
  19
  20 #ifdef __BORLANDC__
  21 #pragma hdrstop
  22 #endif
  23
  24 #ifndef WX_PRECOMP
  25 #include "wx/hash.h"
  26 #endif
  27
  28 #include <string.h>
  29
  30 #if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
  31 #include "wx/memory.h"
  32 #endif
  33
  34 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
  35     // for wxObject::Dump
  36     #include "wx/ioswrap.h"
  37
  38     #if defined(__VISAGECPP__)
  39         #define DEBUG_PRINTF(NAME) { static int raz=0; \
  40             printf( #NAME " %i\n",raz); fflush(stdout); raz++; }
  41     #else
  42         #define DEBUG_PRINTF(NAME)
  43     #endif
  44 #endif // __WXDEBUG__ || wxUSE_DEBUG_CONTEXT
  45
  46 // we must disable optimizations for VC.NET because otherwise its too eager
  47 // linker discards wxClassInfo objects in release build thus breaking many,
  48 // many things
  49 #if defined _MSC_VER && _MSC_VER >= 1300
  50     #pragma optimize("", off)
  51 #endif
  52
  53 wxClassInfo wxObject::sm_classwxObject( wxT("wxObject"), 0, 0,
  54                                         (int) sizeof(wxObject),
  55                                         (wxObjectConstructorFn) 0 );
  56
  57 // restore optimizations
  58 #if defined _MSC_VER && _MSC_VER >= 1300
  59     #pragma optimize("", on)
  60 #endif
  61
  62 wxClassInfo* wxClassInfo::sm_first = NULL;
  63 wxHashTable* wxClassInfo::sm_classTable = NULL;
  64
  65 // These are here so we can avoid 'always true/false' warnings
  66 // by referring to these instead of TRUE/FALSE
  67 const bool wxTrue = TRUE;
  68 const bool wxFalse = FALSE;
  69
  70 // Is this object a kind of (a subclass of) 'info'?
  71 // E.g. is wxWindow a kind of wxObject?
  72 // Go from this class to superclass, taking into account
  73 // two possible base classes.
  74 bool wxObject::IsKindOf(wxClassInfo *info) const
  75 {
  76     wxClassInfo *thisInfo = GetClassInfo();
  77     return (thisInfo) ? thisInfo->IsKindOf(info) : FALSE ;
  78 }
  79
  80 #if wxUSE_STD_IOSTREAM && (defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT)
  81 void wxObject::Dump(wxSTD ostream& str)
  82 {
  83     if (GetClassInfo() && GetClassInfo()->GetClassName())
  84         str << GetClassInfo()->GetClassName();
  85     else
  86         str << _T("unknown object class");
  87 }
  88 #endif
  89
  90
  91 #if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING && defined( new )
  92         #undef new
  93 #endif
  94
  95
  96 #ifdef _WX_WANT_NEW_SIZET_WXCHAR_INT
  97 void *wxObject::operator new ( size_t size, const wxChar *fileName, int lineNum )
  98 {
  99     return wxDebugAlloc(size, (wxChar*) fileName, lineNum, TRUE);
 100 }
 101 #endif
 102
 103 #ifdef _WX_WANT_DELETE_VOID
 104 void wxObject::operator delete ( void *buf )
 105 {
 106     wxDebugFree(buf);
 107 }
 108 #endif
 109
 110 #ifdef _WX_WANT_DELETE_VOID_CONSTCHAR_SIZET
 111 void wxObject::operator delete ( void *buf, const char *_fname, size_t _line )
 112 {
 113     wxDebugFree(buf);
 114 }
 115 #endif
 116
 117 #ifdef _WX_WANT_DELETE_VOID_WXCHAR_INT
 118 void wxObject::operator delete ( void *buf, const wxChar *WXUNUSED(fileName), int WXUNUSED(lineNum) )
 119 {
 120      wxDebugFree(buf);
 121 }
 122 #endif
 123
 124 #ifdef _WX_WANT_ARRAY_NEW_SIZET_WXCHAR_INT
 125 void *wxObject::operator new[] ( size_t size, const wxChar* fileName, int lineNum )
 126 {
 127     return wxDebugAlloc(size, (wxChar*) fileName, lineNum, TRUE, TRUE);
 128 }
 129 #endif
 130
 131 #ifdef _WX_WANT_ARRAY_DELETE_VOID
 132 void wxObject::operator delete[] ( void *buf )
 133 {
 134     wxDebugFree(buf, TRUE);
 135 }
 136 #endif
 137
 138 #ifdef _WX_WANT_ARRAY_DELETE_VOID_WXCHAR_INT
 139 void wxObject::operator delete[] (void * buf, const wxChar*  WXUNUSED(fileName), int WXUNUSED(lineNum) )
 140 {
 141     wxDebugFree(buf, TRUE);
 142 }
 143 #endif
 144
 145
 146 // ----------------------------------------------------------------------------
 147 // wxClassInfo
 148 // ----------------------------------------------------------------------------
 149
 150 wxClassInfo::~wxClassInfo()
 151 {
 152     // remove this object from the linked list of all class infos: if we don't
 153     // do it, loading/unloading a DLL containing static wxClassInfo objects is
 154     // not going to work
 155     if ( this == sm_first )
 156     {
 157         sm_first = m_next;
 158     }
 159     else
 160     {
 161         wxClassInfo *info = sm_first;
 162         while (info)
 163         {
 164             if ( info->m_next == this )
 165             {
 166                 info->m_next = m_next;
 167                 break;
 168             }
 169
 170             info = info->m_next;
 171         }
 172     }
 173 }
 174
 175 wxClassInfo *wxClassInfo::FindClass(const wxChar *className)
 176 {
 177     if ( sm_classTable )
 178     {
 179         return (wxClassInfo *)wxClassInfo::sm_classTable->Get(className);
 180     }
 181     else
 182     {
 183         for ( wxClassInfo *info = sm_first; info ; info = info->m_next )
 184         {
 185             if ( wxStrcmp(info->GetClassName(), className) == 0 )
 186                 return info;
 187         }
 188
 189         return NULL;
 190     }
 191 }
 192
 193 // a tiny InitializeClasses() helper
 194 /* static */
 195 inline wxClassInfo *wxClassInfo::GetBaseByName(const wxChar *name)
 196 {
 197     if ( !name )
 198         return NULL;
 199
 200     wxClassInfo *classInfo = (wxClassInfo *)sm_classTable->Get(name);
 201
 202 #ifdef __WXDEBUG__
 203     // this must be fixed, other things will work wrongly later if you get this
 204     if ( !classInfo )
 205     {
 206         wxFAIL_MSG( wxString::Format
 207                     (
 208                         _T("base class '%s' is unknown to wxWindows RTTI"),
 209                         name
 210                     ) );
 211     }
 212 #endif // __WXDEBUG__
 213
 214     return classInfo;
 215 }
 216
 217 // Set pointers to base class(es) to speed up IsKindOf
 218 void wxClassInfo::InitializeClasses()
 219 {
 220     // using IMPLEMENT_DYNAMIC_CLASS() macro twice (which may happen if you
 221     // link any object module twice mistakenly) will break this function
 222     // because it will enter an infinite loop and eventually die with "out of
 223     // memory" - as this is quite hard to detect if you're unaware of this,
 224     // try to do some checks here
 225
 226 #ifdef __WXDEBUG__
 227     static const size_t nMaxClasses = 10000;    // more than we'll ever have
 228     size_t nClass = 0;
 229 #endif
 230
 231     sm_classTable = new wxHashTable(wxKEY_STRING);
 232
 233         // Index all class infos by their class name
 234
 235     wxClassInfo *info;
 236     for(info = sm_first; info; info = info->m_next)
 237     {
 238         if (info->m_className)
 239         {
 240             wxASSERT_MSG( ++nClass < nMaxClasses,
 241                           _T("an infinite loop detected - have you used IMPLEMENT_DYNAMIC_CLASS() twice (may be by linking some object module(s) twice)?") );
 242             sm_classTable->Put(info->m_className, (wxObject *)info);
 243         }
 244     }
 245
 246         // Set base pointers for each wxClassInfo
 247
 248     for(info = sm_first; info; info = info->m_next)
 249     {
 250         info->m_baseInfo1 = GetBaseByName(info->GetBaseClassName1());
 251         info->m_baseInfo2 = GetBaseByName(info->GetBaseClassName2());
 252     }
 253 }
 254
 255 void wxClassInfo::CleanUpClasses()
 256 {
 257     delete wxClassInfo::sm_classTable;
 258     wxClassInfo::sm_classTable = NULL;
 259 }
 260
 261
 262 wxObject *wxCreateDynamicObject(const wxChar *name)
 263 {
 264 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
 265     DEBUG_PRINTF(wxObject *wxCreateDynamicObject)
 266 #endif
 267
 268     if ( wxClassInfo::sm_classTable )
 269     {
 270         wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);
 271         return info ? info->CreateObject() : NULL;
 272     }
 273     else // no sm_classTable yet
 274     {
 275         for ( wxClassInfo *info = wxClassInfo::sm_first;
 276               info;
 277               info = info->m_next )
 278         {
 279             if (info->m_className && wxStrcmp(info->m_className, name) == 0)
 280                 return info->CreateObject();
 281         }
 282
 283         return NULL;
 284     }
 285 }
 286
 287
 288 // ----------------------------------------------------------------------------
 289 // wxObject
 290 // ----------------------------------------------------------------------------
 291
 292 // Initialize ref data from another object (needed for copy constructor and
 293 // assignment operator)
 294 void wxObject::InitFrom(const wxObject& other)
 295 {
 296     m_refData = other.m_refData;
 297     if ( m_refData )
 298         m_refData->m_count++;
 299 }
 300
 301 void wxObject::Ref(const wxObject& clone)
 302 {
 303 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
 304     DEBUG_PRINTF(wxObject::Ref)
 305 #endif
 306
 307     // nothing to be done
 308     if (m_refData == clone.m_refData)
 309         return;
 310
 311     // delete reference to old data
 312     UnRef();
 313
 314     // reference new data
 315     if ( clone.m_refData )
 316     {
 317         m_refData = clone.m_refData;
 318         ++(m_refData->m_count);
 319     }
 320 }
 321
 322 void wxObject::UnRef()
 323 {
 324     if ( m_refData )
 325     {
 326         wxASSERT_MSG( m_refData->m_count > 0, _T("invalid ref data count") );
 327
 328         if ( !--m_refData->m_count )
 329             delete m_refData;
 330         m_refData = NULL;
 331     }
 332 }
 333
 334 void wxObject::AllocExclusive()
 335 {
 336     if ( !m_refData )
 337     {
 338         m_refData = CreateRefData();
 339     }
 340     else if ( m_refData->GetRefCount() > 1 )
 341     {
 342         // note that ref is not going to be destroyed in this case
 343         const wxObjectRefData* ref = m_refData;
 344         UnRef();
 345
 346         // ... so we can still access it
 347         m_refData = CloneRefData(ref);
 348     }
 349     //else: ref count is 1, we are exclusive owners of m_refData anyhow
 350
 351     wxASSERT_MSG( m_refData && m_refData->GetRefCount() == 1,
 352                   _T("wxObject::AllocExclusive() failed.") );
 353 }
 354
 355 wxObjectRefData *wxObject::CreateRefData() const
 356 {
 357     // if you use AllocExclusive() you must override this method
 358     wxFAIL_MSG( _T("CreateRefData() must be overridden if called!") );
 359
 360     return NULL;
 361 }
 362
 363 wxObjectRefData *
 364 wxObject::CloneRefData(const wxObjectRefData * WXUNUSED(data)) const
 365 {
 366     // if you use AllocExclusive() you must override this method
 367     wxFAIL_MSG( _T("CloneRefData() must be overridden if called!") );
 368
 369     return NULL;
 370 }
 371
 372 // ----------------------------------------------------------------------------
 373 // misc
 374 // ----------------------------------------------------------------------------
 375
 376 #if defined(__DARWIN__) && defined(WXMAKINGDLL)
 377
 378 extern "C" {
 379     void __initialize_Cplusplus(void);
 380     void wxWindowsDylibInit(void);
 381 };
 382
 383 // Dynamic shared library (dylib) initialization routine
 384 //   required to initialize static C++ objects bacause of lazy dynamic linking
 385 //   http://developer.apple.com/techpubs/macosx/Essentials/
 386 //          SystemOverview/Frameworks/Dynamic_Shared_Libraries.html
 387
 388 void wxWindowsDylibInit()
 389 {
 390     // The function __initialize_Cplusplus() must be called from the shared
 391     // library initialization routine to cause the static C++ objects in
 392     // the library to be initialized (reference number 2441683).
 393
 394     // This only seems to be necessary if the library initialization routine
 395     // needs to use the static C++ objects
 396     __initialize_Cplusplus();
 397 }
 398
 399 #endif
 400
 401 // vi:sts=4:sw=4:et