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Diffstat (limited to 'src/kvilib/core/kvi_heapobject.cpp')
| -rw-r--r-- | src/kvilib/core/kvi_heapobject.cpp | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/kvilib/core/kvi_heapobject.cpp b/src/kvilib/core/kvi_heapobject.cpp new file mode 100644 index 0000000..7568086 --- /dev/null +++ b/src/kvilib/core/kvi_heapobject.cpp @@ -0,0 +1,96 @@ +//============================================================================= +// +// File : kvi_heapobject.cpp +// Created on Wed 24 Mar 2004 04:45:17 by Szymon Stefanek +// +// This file is part of the KVIrc IRC client distribution +// Copyright (C) 2004-2006 Szymon Stefanek <pragma at kvirc dot net> +// +// This program is FREE software. You can redistribute it and/or +// modify it under the terms of the GNU General Public License +// as published by the Free Software Foundation; either version 2 +// of the License, or (at your opinion) any later version. +// +// This program is distributed in the HOPE that it will be USEFUL, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +// See the GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, write to the Free Software Foundation, +// Inc. ,51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +// +//============================================================================= + +#define __KVILIB__ + + +#include "kvi_heapobject.h" +#include "kvi_malloc.h" + +// On windows we need to override new and delete operators +// to ensure that always the right new/delete pair is called for an object instance +// This bug jumps out because windows uses a local heap for each +// executable module (exe or dll). +// (this is a well known bug described in Q122675 of MSDN) + +// on Linux it is not needed: there is a single global heap + + + +// 05.02.2005 : scalar/vector deleting destructors in modules +// +// There are also other issues involving the MSVC compiler. +// When the operator new is called on an object with a virtual +// destructor the compiler generates a helper function +// called "vector deleting destructor" that is used to both +// free the object's memory and call the object's destructor. +// (In fact there is also a "scalar deleting destructor" but +// MSVC seems to call the vector version also for scalar deletes ?!?) +// The problem arises when operator new is called in a module: +// the helper function gets stuffed in one of the module's sections +// and when the module is unloaded any attempt to delete +// the object will simply jump into no man's land. + +// An "unhandled exception" in a "call [%eax]" corresponding +// to a delete <pointer> may be a symptom of this problem. + +// I haven't been able to find a solution nicer than having +// a static allocation function in each class that can be +// created from inside a module and destroyed anywhere else +// and has a virtual destructor. + +#ifdef COMPILE_ON_WINDOWS + void * KviHeapObject::operator new(size_t uSize) + { + return kvi_malloc(uSize); + } + + void KviHeapObject::operator delete(void * pData) + { + kvi_free(pData); + } + + void * KviHeapObject::operator new[](size_t uSize) + { + return kvi_malloc(uSize); + } + + void KviHeapObject::operator delete[](void * pData) + { + kvi_free(pData); + } + + // these are the debug versions... + void * KviHeapObject::operator new(size_t uSize,const char *,int) + { + return kvi_malloc(uSize); + } + + void KviHeapObject::operator delete(void * pData,const char *,int) + { + kvi_free(pData); + } +#endif + + |