X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/66d2fa18eeef93c1ea4bffe704dac54531ef064c..a8c5e1a9d1f56190e2d87aadc40a75589585af1f:/src/common/object.cpp

diff --git a/src/common/object.cpp b/src/common/object.cpp
index e7692e7384..0a77aab57b 100644
--- a/src/common/object.cpp
+++ b/src/common/object.cpp
@@ -10,28 +10,21 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "object.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #ifndef WX_PRECOMP
-    #include "wx/hash.h"
     #include "wx/object.h"
+    #include "wx/hash.h"
+    #include "wx/memory.h"
 #endif
 
 #include <string.h>
 
-#if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
-#include "wx/memory.h"
-#endif
-
 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
     #if defined(__VISAGECPP__)
         #define DEBUG_PRINTF(NAME) { static int raz=0; \
@@ -96,9 +89,7 @@ wxClassInfo *wxObject::GetClassInfo() const
 
 #endif // wxUSE_EXTENDED_RTTI
 
-// These are here so we can avoid 'always true/false' warnings
-// by referring to these instead of true/false
-const bool wxTrue = true;
+// this variable exists only so that we can avoid 'always true/false' warnings
 const bool wxFalse = false;
 
 // Is this object a kind of (a subclass of) 'info'?
@@ -214,31 +205,49 @@ wxClassInfo *wxClassInfo::FindClass(const wxChar *className)
     }
 }
 
-void wxClassInfo::CleanUp()
-{
-    if ( sm_classTable )
-    {
-        delete sm_classTable;
-        sm_classTable = NULL;
-    }
-}
+// This function wasn't written to be reentrant but there is a possiblity of
+// reentrance if something it does causes a shared lib to load and register
+// classes. On Solaris this happens when the wxHashTable is newed, so the first
+// part of the function has been modified to handle it, and a wxASSERT checks
+// against reentrance in the remainder of the function.
 
 void wxClassInfo::Register()
 {
     if ( !sm_classTable )
     {
-        sm_classTable = new wxHashTable(wxKEY_STRING);
+        wxHashTable *classTable = new wxHashTable(wxKEY_STRING);
+
+        // check for reentrance
+        if ( sm_classTable )
+            delete classTable;
+        else
+            sm_classTable = classTable;
     }
 
-    // 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__
+    // reentrance guard - see note above
+    static int entry = 0;
+    wxASSERT_MSG(++entry == 1, _T("wxClassInfo::Register() reentrance"));
+#endif
+
+    // Using IMPLEMENT_DYNAMIC_CLASS() macro twice (which may happen if you
+    // link any object module twice mistakenly, or link twice against wx shared
+    // library) 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.
     wxASSERT_MSG( sm_classTable->Get(m_className) == NULL,
-                  _T("class already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() twice (may be by linking some object module(s) twice)?") );
+        wxString::Format
+        (
+            _T("Class \"%s\" already in RTTI table - have you used IMPLEMENT_DYNAMIC_CLASS() multiple times or linked some object file twice)?"),
+            m_className
+        )
+    );
 
     sm_classTable->Put(m_className, (wxObject *)this);
+
+#ifdef __WXDEBUG__
+    --entry;
+#endif
 }
 
 void wxClassInfo::Unregister()
@@ -284,15 +293,6 @@ wxObject *wxCreateDynamicObject(const wxChar *name)
 // wxObject
 // ----------------------------------------------------------------------------
 
-// Initialize ref data from another object (needed for copy constructor and
-// assignment operator)
-void wxObject::InitFrom(const wxObject& other)
-{
-    m_refData = other.m_refData;
-    if ( m_refData )
-        m_refData->m_count++;
-}
-
 void wxObject::Ref(const wxObject& clone)
 {
 #if defined(__WXDEBUG__) || wxUSE_DEBUG_CONTEXT
@@ -320,7 +320,7 @@ void wxObject::UnRef()
     {
         wxASSERT_MSG( m_refData->m_count > 0, _T("invalid ref data count") );
 
-        if ( !--m_refData->m_count )
+        if ( --m_refData->m_count == 0 )
             delete m_refData;
         m_refData = NULL;
     }