Minor corrections.

[wxWidgets.git] / src / common / object.cpp

diff --git a/src/common/object.cpp b/src/common/object.cpp
index 272e88a21f514df935fe6b40190accfe416371b9..bbbf5350e3ae294217dd2ca63780a0cc600845cd 100644 (file)
--- a/src/common/object.cpp
+++ b/src/common/object.cpp
@@ -1,12 +1,13 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        object.cpp
+// Name:        src/common/object.cpp

 // Purpose:     wxObject implementation
 // Author:      Julian Smart
 // Purpose:     wxObject implementation
 // Author:      Julian Smart

-// Modified by:
+// Modified by: Ron Lee

 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Created:     04/01/98
 // RCS-ID:      $Id$

-// Copyright:   (c) Julian Smart and Markus Holzem
-// Licence:    wxWindows license
+// Copyright:   (c) 1998 Julian Smart and Markus Holzem
+//              (c) 2001 Ron Lee <ron@debian.org>
+// Licence:     wxWindows license

 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__
 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__


@@ -22,248 +23,364 @@
 
 #ifndef WX_PRECOMP
 #include "wx/hash.h"
 
 #ifndef WX_PRECOMP
 #include "wx/hash.h"

-#include "wx/objstrm.h"

 #endif
 
 #include <string.h>
 #endif
 
 #include <string.h>

-#include <assert.h>

 
 

-#if (WXDEBUG && USE_MEMORY_TRACING) || USE_DEBUG_CONTEXT
+#if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT

 #include "wx/memory.h"
 #endif
 
 #include "wx/memory.h"
 #endif
 

-#if WXDEBUG || USE_DEBUG_CONTEXT
-  // for wxObject::Dump
-  #include <iostream.h>
-#endif
+#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
+    // for wxObject::Dump
+    #include "wx/ioswrap.h"

 
 

-#if !USE_SHARED_LIBRARY
-wxClassInfo wxObject::classwxObject("wxObject", NULL, NULL, sizeof(wxObject), NULL);
-wxClassInfo *wxClassInfo::first = NULL;
-#endif
+    #if defined(__VISAGECPP__)
+        #define DEBUG_PRINTF(NAME) { static int raz=0; \
+            printf( #NAME " %i\n",raz); fflush(stdout); raz++; }
+    #else
+        #define DEBUG_PRINTF(NAME)
+    #endif
+#endif // __WXDEBUG__ || wxUSE_DEBUG_CONTEXT
+
+
+wxClassInfo wxObject::sm_classwxObject( wxT("wxObject"), 0, 0,
+                                        (int) sizeof(wxObject),
+                                        (wxObjectConstructorFn) 0 );
+
+wxClassInfo* wxClassInfo::sm_first = NULL;
+wxHashTable* wxClassInfo::sm_classTable = NULL;

 
 

-/*
- * wxWindows root object.
- */
+// These are here so we can avoid 'always true/false' warnings
+// by referring to these instead of TRUE/FALSE
+const bool wxTrue = TRUE;
+const bool wxFalse = FALSE;

 
 

-wxObject::wxObject(void)
+// Is this object a kind of (a subclass of) 'info'?
+// E.g. is wxWindow a kind of wxObject?
+// Go from this class to superclass, taking into account
+// two possible base classes.
+bool wxObject::IsKindOf(wxClassInfo *info) const

 {
 {

-  m_refData = NULL;
+    wxClassInfo *thisInfo = GetClassInfo();
+    return (thisInfo) ? thisInfo->IsKindOf(info) : FALSE ;

 }
 
 }
 

-wxObject::~wxObject(void)
+#if wxUSE_STD_IOSTREAM && (defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT)
+void wxObject::Dump(wxSTD ostream& str)

 {
 {

-       UnRef();
+    if (GetClassInfo() && GetClassInfo()->GetClassName())
+        str << GetClassInfo()->GetClassName();
+    else
+        str << _T("unknown object class");

 }
 }

+#endif
+
+
+#if defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING && defined( new )
+       #undef new
+#endif

 
 

-/*
- * Is this object a kind of (a subclass of) 'info'?
- * E.g. is wxWindow a kind of wxObject?
- * Go from this class to superclass, taking into account
- * two possible base classes.
- */
- 
-bool wxObject::IsKindOf(wxClassInfo *info)
+
+#ifdef _WX_WANT_NEW_SIZET_WXCHAR_INT
+void *wxObject::operator new ( size_t size, const wxChar *fileName, int lineNum )

 {
 {

-  wxClassInfo *thisInfo = GetClassInfo();
-  if (thisInfo)
-    return thisInfo->IsKindOf(info);
-  else
-    return FALSE;
+    return wxDebugAlloc(size, (wxChar*) fileName, lineNum, TRUE);

 }
 }

+#endif

 
 

-#if WXDEBUG || USE_DEBUG_CONTEXT
-void wxObject::Dump(ostream& str)
+#ifdef _WX_WANT_DELETE_VOID
+void wxObject::operator delete ( void *buf )

 {
 {

-  if (GetClassInfo() && GetClassInfo()->GetClassName())
-    str << GetClassInfo()->GetClassName();
-  else
-    str << "unknown object class";
+    wxDebugFree(buf);

 }
 #endif
 
 }
 #endif
 

-#if WXDEBUG && USE_MEMORY_TRACING
-
-#ifdef new
-#undef new
+#ifdef _WX_WANT_DELETE_VOID_CONSTCHAR_SIZET
+void wxObject::operator delete ( void *buf, const char *_fname, size_t _line )
+{
+    wxDebugFree(buf);
+}

 #endif
 
 #endif
 

-void * wxObject::operator new (size_t size, char * fileName, int lineNum)
+#ifdef _WX_WANT_DELETE_VOID_WXCHAR_INT
+void wxObject::operator delete ( void *buf, const wxChar *WXUNUSED(fileName), int WXUNUSED(lineNum) )

 {
 {

-  return wxDebugAlloc(size, fileName, lineNum, TRUE);
+     wxDebugFree(buf);

 }
 }

+#endif

 
 

-void wxObject::operator delete (void * buf)
+#ifdef _WX_WANT_ARRAY_NEW_SIZET_WXCHAR_INT
+void *wxObject::operator new[] ( size_t size, const wxChar* fileName, int lineNum )

 {
 {

-  wxDebugFree(buf);
+    return wxDebugAlloc(size, (wxChar*) fileName, lineNum, TRUE, TRUE);

 }
 }

+#endif

 
 

-// Cause problems for VC++ - crashes
-#ifndef _MSC_VER
-void * wxObject::operator new[] (size_t size, char * fileName, int lineNum)
+#ifdef _WX_WANT_ARRAY_DELETE_VOID
+void wxObject::operator delete[] ( void *buf )

 {
 {

-  return wxDebugAlloc(size, fileName, lineNum, TRUE, TRUE);
+    wxDebugFree(buf, TRUE);

 }
 }

+#endif

 
 

-void wxObject::operator delete[] (void * buf)
+#ifdef _WX_WANT_ARRAY_DELETE_VOID_WXCHAR_INT
+void wxObject::operator delete[] (void * buf, const wxChar*  WXUNUSED(fileName), int WXUNUSED(lineNum) )

 {
 {

-  wxDebugFree(buf, TRUE);
+    wxDebugFree(buf, TRUE);

 }
 #endif
 
 }
 #endif
 

-#endif

 
 

-/*
- * Class info: provides run-time class type information.
- */
+// ----------------------------------------------------------------------------
+// wxClassInfo
+// ----------------------------------------------------------------------------

 
 

-wxClassInfo::wxClassInfo(char *cName, char *baseName1, char *baseName2, int sz, wxObjectConstructorFn constr)
+wxClassInfo::~wxClassInfo()

 {
 {

-  className = cName;
-  baseClassName1 = baseName1;
-  baseClassName2 = baseName2;
-
-  objectSize = sz;
-  objectConstructor = constr;
-  
-  next = first;
-  first = this;
-
-  baseInfo1 = NULL;
-  baseInfo2 = NULL;
+    // remove this object from the linked list of all class infos: if we don't
+    // do it, loading/unloading a DLL containing static wxClassInfo objects is
+    // not going to work
+    if ( this == sm_first )
+    {
+        sm_first = m_next;
+    }
+    else
+    {
+        wxClassInfo *info = sm_first;
+        while (info)
+        {
+            if ( info->m_next == this )
+            {
+                info->m_next = m_next;
+                break;
+            }
+
+            info = info->m_next;
+        }
+    }

 }
 
 }
 

-wxObject *wxClassInfo::CreateObject(void)
+wxClassInfo *wxClassInfo::FindClass(const wxChar *className)

 {
 {

-  if (objectConstructor)
-    return (wxObject *)(*objectConstructor)();
-  else
-    return NULL;
+    if ( sm_classTable )
+    {
+        return (wxClassInfo *)wxClassInfo::sm_classTable->Get(className);
+    }
+    else
+    {
+        for ( wxClassInfo *info = sm_first; info ; info = info->m_next )
+        {
+            if ( wxStrcmp(info->GetClassName(), className) == 0 )
+                return info;
+        }
+
+        return NULL;
+    }

 }
 
 }
 

-wxClassInfo *wxClassInfo::FindClass(char *c)
+// a tiny InitializeClasses() helper
+/* static */
+inline wxClassInfo *wxClassInfo::GetBaseByName(const wxChar *name)

 {
 {

-  wxClassInfo *p = first;
-  while (p)
-  {
-    if (p && p->GetClassName() && strcmp(p->GetClassName(), c) == 0)
-      return p;
-    p = p->next;
-  }
-  return NULL;
+    if ( !name )
+        return NULL;
+
+    wxClassInfo *classInfo = (wxClassInfo *)sm_classTable->Get(name);
+
+    // this must be fixed, other things risk work wrongly later if you get this
+    wxASSERT_MSG( classInfo,
+                  wxString::Format
+                  (
+                    _T("base class '%s' is unknown to wxWindows RTTI"),
+                    name
+                  ) );
+
+    return classInfo;

 }
 
 }
 

-// Climb upwards through inheritance hierarchy.
-// Dual inheritance is catered for.
-bool wxClassInfo::IsKindOf(wxClassInfo *info)
+// Set pointers to base class(es) to speed up IsKindOf
+void wxClassInfo::InitializeClasses()

 {
 {

-  if (info == NULL)
-    return FALSE;
-
-  // For some reason, when making/using a DLL, static data has to be included
-  // in both the DLL and the application. This can lead to duplicate
-  // wxClassInfo objects, so we have to test the name instead of the pointers.
-#if WXMAKINGDLL
-  if (GetClassName() && info->GetClassName() && (strcmp(GetClassName(), info->GetClassName()) == 0))
-    return TRUE;
-#else
-  if (this == info)
-    return TRUE;
+    // using IMPLEMENT_DYNAMIC_CLASS() macro twice (which may happen if you
+    // link any object module twice mistakenly) will break this function
+    // because it will enter an infinite loop and eventually die with "out of
+    // memory" - as this is quite hard to detect if you're unaware of this,
+    // try to do some checks here
+
+#ifdef __WXDEBUG__
+    static const size_t nMaxClasses = 10000;    // more than we'll ever have
+    size_t nClass = 0;

 #endif
 
 #endif
 

-  if (baseInfo1)
-    if (baseInfo1->IsKindOf(info))
-      return TRUE;
+    sm_classTable = new wxHashTable(wxKEY_STRING);
+
+        // Index all class infos by their class name
+
+    wxClassInfo *info;
+    for(info = sm_first; info; info = info->m_next)
+    {
+        if (info->m_className)
+        {
+            wxASSERT_MSG( ++nClass < nMaxClasses,
+                          _T("an infinite loop detected - have you used IMPLEMENT_DYNAMIC_CLASS() twice (may be by linking some object module(s) twice)?") );
+            sm_classTable->Put(info->m_className, (wxObject *)info);
+        }
+    }

 
 

-  if (baseInfo2)
-    return baseInfo2->IsKindOf(info);
+        // Set base pointers for each wxClassInfo

 
 

-  return FALSE;
+    for(info = sm_first; info; info = info->m_next)
+    {
+        info->m_baseInfo1 = GetBaseByName(info->GetBaseClassName1());
+        info->m_baseInfo2 = GetBaseByName(info->GetBaseClassName2());
+    }

 }
 
 }
 

-// Set pointers to base class(es) to speed up IsKindOf
-void wxClassInfo::InitializeClasses(void)
+void wxClassInfo::CleanUpClasses()

 {
 {

-  wxHashTable table(wxKEY_STRING);
-
-  // Index all class infos by their class name
-  wxClassInfo *info = first;
-  while (info)
-  {
-    if (info->className)
-      table.Put(info->className, (wxObject *)info);
-    info = info->next;
-  }
-
-  // Set base pointers for each wxClassInfo
-  info = first;
-  while (info)
-  {
-    if (info->GetBaseClassName1())
-      info->baseInfo1 = (wxClassInfo *)table.Get(info->GetBaseClassName1());
-    if (info->GetBaseClassName2())
-      info->baseInfo2 = (wxClassInfo *)table.Get(info->GetBaseClassName2());
-    info = info->next;
-  }
+    delete wxClassInfo::sm_classTable;
+    wxClassInfo::sm_classTable = NULL;

 }
 
 }
 

-wxObject *wxCreateDynamicObject(char *name)
+
+wxObject *wxCreateDynamicObject(const wxChar *name)

 {
 {

-  wxClassInfo *info = wxClassInfo::first;
-  while (info)
-  {
-    if (info->className && strcmp(info->className, name) == 0)
-      return info->CreateObject();
-    info = info->next;
-  }
-  return NULL;
+#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
+    DEBUG_PRINTF(wxObject *wxCreateDynamicObject)
+#endif
+
+    if ( wxClassInfo::sm_classTable )
+    {
+        wxClassInfo *info = (wxClassInfo *)wxClassInfo::sm_classTable->Get(name);
+        return info ? info->CreateObject() : NULL;
+    }
+    else // no sm_classTable yet
+    {
+        for ( wxClassInfo *info = wxClassInfo::sm_first;
+              info;
+              info = info->m_next )
+        {
+            if (info->m_className && wxStrcmp(info->m_className, name) == 0)
+                return info->CreateObject();
+        }
+
+        return NULL;
+    }

 }
 
 }
 

-#ifdef USE_STORABLE_CLASSES

 
 

-wxObject* wxCreateStoredObject( wxInputStream &stream )
+// ----------------------------------------------------------------------------
+// wxObject
+// ----------------------------------------------------------------------------
+
+// Initialize ref data from another object (needed for copy constructor and
+// assignment operator)
+void wxObject::InitFrom(const wxObject& other)

 {
 {

-  wxObjectInputStream obj_s(stream);
-  return obj_s.LoadObject();
-};
+    m_refData = other.m_refData;
+    if ( m_refData )
+        m_refData->m_count++;
+}

 
 

+void wxObject::Ref(const wxObject& clone)
+{
+#if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
+    DEBUG_PRINTF(wxObject::Ref)

 #endif
 
 #endif
 

-/*
- * wxObject: cloning of objects
- */
+    // nothing to be done
+    if (m_refData == clone.m_refData)
+        return;

 
 

-void wxObject::Ref(const wxObject& clone)
-{

     // delete reference to old data
     UnRef();
     // delete reference to old data
     UnRef();

+

     // reference new data
     // reference new data

-    if (clone.m_refData) {
+    if ( clone.m_refData )
+    {

         m_refData = clone.m_refData;
         ++(m_refData->m_count);
     }
 }
 
         m_refData = clone.m_refData;
         ++(m_refData->m_count);
     }
 }
 

-void wxObject::UnRef(void)
+void wxObject::UnRef()

 {
 {

-    if (m_refData) {
-        assert(m_refData->m_count > 0);
-        --(m_refData->m_count);
-        if (m_refData->m_count == 0)
+    if ( m_refData )
+    {
+        wxASSERT_MSG( m_refData->m_count > 0, _T("invalid ref data count") );
+
+        if ( !--m_refData->m_count )

             delete m_refData;
             delete m_refData;

+        m_refData = NULL;

     }
     }

-    m_refData = NULL;

 }
 
 }
 

-/*
- * wxObjectData
- */
+void wxObject::AllocExclusive()
+{
+    if ( !m_refData )
+    {
+        m_refData = CreateRefData();
+    }
+    else if ( m_refData->GetRefCount() > 1 )
+    {
+        // note that ref is not going to be destroyed in this case
+        const wxObjectRefData* ref = m_refData;
+        UnRef();
+
+        // ... so we can still access it
+        m_refData = CloneRefData(ref);
+    }
+    //else: ref count is 1, we are exclusive owners of m_refData anyhow

 
 

-wxObjectRefData::wxObjectRefData(void) : m_count(1)
+    wxASSERT_MSG( m_refData && m_refData->GetRefCount() == 1,
+                  _T("wxObject::AllocExclusive() failed.") );
+}
+
+wxObjectRefData *wxObject::CreateRefData() const
+{
+    // if you use AllocExclusive() you must override this method
+    wxFAIL_MSG( _T("CreateRefData() must be overridden if called!") );
+
+    return NULL;
+}
+
+wxObjectRefData *
+wxObject::CloneRefData(const wxObjectRefData * WXUNUSED(data)) const

 {
 {

+    // if you use AllocExclusive() you must override this method
+    wxFAIL_MSG( _T("CloneRefData() must be overridden if called!") );
+
+    return NULL;

 }
 
 }
 

-wxObjectRefData::~wxObjectRefData(void)
+// ----------------------------------------------------------------------------
+// misc
+// ----------------------------------------------------------------------------
+
+#if defined(__DARWIN__) && defined(WXMAKINGDLL)
+
+extern "C" {
+    void __initialize_Cplusplus(void);
+    void wxWindowsDylibInit(void);
+};
+
+// Dynamic shared library (dylib) initialization routine
+//   required to initialize static C++ objects bacause of lazy dynamic linking
+//   http://developer.apple.com/techpubs/macosx/Essentials/
+//          SystemOverview/Frameworks/Dynamic_Shared_Libraries.html
+
+void wxWindowsDylibInit()

 {
 {

+    // The function __initialize_Cplusplus() must be called from the shared
+    // library initialization routine to cause the static C++ objects in
+    // the library to be initialized (reference number 2441683).
+
+    // This only seems to be necessary if the library initialization routine
+    // needs to use the static C++ objects
+    __initialize_Cplusplus();

 }
 
 }
 

+#endif
+
+// vi:sts=4:sw=4:et