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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt for Python.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "debugfreehook.h"
#include "bindingmanager.h"
#include "gilstate.h"
#if defined(_WIN32) && defined(_DEBUG)
#include <crtdbg.h>
#include <windows.h>
#endif
#ifdef __GLIBC__
#include <malloc.h>
#endif
#ifdef __APPLE__
#include <malloc/malloc.h>
#include <mach/mach.h>
#include <mach/mach_vm.h>
#endif
#ifdef SHIBOKEN_INSTALL_FREE_DEBUG_HOOK
extern "C" {
static int testPointerBeingFreed(void *ptr)
{
// It is an error for a deleted pointer address to still be registered
// in the BindingManager
if (Shiboken::BindingManager::instance().hasWrapper(ptr)) {
Shiboken::GilState state;
SbkObject *wrapper = Shiboken::BindingManager::instance().retrieveWrapper(ptr);
fprintf(stderr, "SbkObject still in binding map when deleted: ");
PyObject_Print(reinterpret_cast<PyObject *>(wrapper), stderr, 0);
fprintf(stderr, "\n");
#ifdef _WIN32
DebugBreak();
#else
assert(0);
#endif
return FALSE;
}
return TRUE;
}
#if defined(_WIN32) && defined(_DEBUG)
static _CRT_ALLOC_HOOK lastCrtAllocHook;
static int DebugAllocHook(int nAllocType, void *pvData,
size_t nSize, int nBlockUse, long lRequest,
const unsigned char * szFileName, int nLine)
{
// It is an error for a deleted pointer address to still be registered
// in the BindingManager
if ( nAllocType == _HOOK_FREE) {
if ( !testPointerBeingFreed(pvData) ) {
return 0;
}
}
if ( lastCrtAllocHook != NULL ) {
return lastCrtAllocHook(nAllocType, pvData, nSize, nBlockUse, lRequest,
szFileName, nLine);
}
return 1;
}
#endif // _WIN32 && _DEBUG
#ifdef __GLIBC__
static void (*lastFreeHook)(void *ptr, const void *caller);
static void DebugFreeHook(void *ptr, const void *caller)
{
testPointerBeingFreed(ptr);
if ( lastFreeHook != NULL )
lastFreeHook(ptr, caller);
}
#endif // __GLIBC__
#ifdef __APPLE__
static malloc_zone_t lastMallocZone;
static void DebugFreeHook(malloc_zone_t *zone, void *ptr)
{
testPointerBeingFreed(ptr);
if ( lastMallocZone.free != NULL )
lastMallocZone.free(zone, ptr);
}
static void DebugFreeDefiniteSizeHook(malloc_zone_t *zone, void *ptr, size_t size)
{
testPointerBeingFreed(ptr);
if ( lastMallocZone.free_definite_size != NULL )
lastMallocZone.free_definite_size(zone, ptr, size);
}
#endif __APPLE__
void debugInstallFreeHook(void)
{
#if defined(_WIN32) && defined(_DEBUG)
lastCrtAllocHook = _CrtSetAllocHook(DebugAllocHook);
#endif
#ifdef __GLIBC__
// __free_hook is not thread safe so it marked as deprecated. Use here
// is hopefully safe and should catch errors in a single threaded program
// and only miss some in a multithreaded program
lastFreeHook = __free_hook;
__free_hook = DebugFreeHook;
#endif
#ifdef __APPLE__
malloc_zone_t *zone = malloc_default_zone();
assert(zone != NULL);
//remove the write protection from the zone struct
if (zone->version >= 8) {
vm_protect(mach_task_self(), (uintptr_t)zone, sizeof(*zone), 0, VM_PROT_READ | VM_PROT_WRITE);
}
lastMallocZone = *zone;
zone->free = DebugFreeHook;
zone->free_definite_size = DebugFreeDefiniteSizeHook;
if (zone->version >= 8) {
vm_protect(mach_task_self(), (uintptr_t)zone, sizeof(*zone), 0, VM_PROT_READ);
}
#endif
}
void debugRemoveFreeHook(void)
{
#if defined(_WIN32) && defined(_DEBUG)
_CrtSetAllocHook(lastCrtAllocHook);
#endif
#ifdef __GLIBC__
__free_hook = lastFreeHook;
#endif
#ifdef __APPLE__
malloc_zone_t *zone = malloc_default_zone();
assert(zone != NULL);
//remove the write protection from the zone struct
if (zone->version >= 8) {
vm_protect(mach_task_self(), (uintptr_t)zone, sizeof(*zone), 0, VM_PROT_READ | VM_PROT_WRITE);
}
zone->free = lastMallocZone.free;
zone->free_definite_size = lastMallocZone.free_definite_size;
if (zone->version >= 8) {
vm_protect(mach_task_self(), (uintptr_t)zone, sizeof(*zone), 0, VM_PROT_READ);
}
#endif
}
} // extern "C"
#endif // SHIBOKEN_INSTALL_DEBUG_FREE_HOOK
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