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/* -*- Mode: C; c-basic-offset: 4 -*-
* vim: tabstop=4 shiftwidth=4 expandtab
*
* Copyright (C) 2011 John (J5) Palmieri <johnp@redhat.com>, Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "pygi-marshal-cleanup.h"
#include <glib.h>
static inline void
_cleanup_caller_allocates (PyGIInvokeState *state,
PyGIArgCache *cache,
PyObject *py_obj,
gpointer data,
gboolean was_processed)
{
PyGIInterfaceCache *iface_cache = (PyGIInterfaceCache *)cache;
/* check GValue first because GValue is also a boxed sub-type */
if (g_type_is_a (iface_cache->g_type, G_TYPE_VALUE)) {
if (was_processed)
g_value_unset (data);
g_slice_free (GValue, data);
} else if (g_type_is_a (iface_cache->g_type, G_TYPE_BOXED)) {
gsize size;
if (was_processed)
return; /* will be cleaned up at deallocation */
size = g_struct_info_get_size (iface_cache->interface_info);
g_slice_free1 (size, data);
} else if (iface_cache->is_foreign) {
if (was_processed)
return; /* will be cleaned up at deallocation */
pygi_struct_foreign_release ((GIBaseInfo *)iface_cache->interface_info,
data);
} else {
if (was_processed)
return; /* will be cleaned up at deallocation */
g_free (data);
}
}
/**
* Cleanup during invoke can happen in multiple
* stages, each of which can be the result of a
* successful compleation of that stage or an error
* occured which requires partial cleanup.
*
* For the most part, either the C interface being
* invoked or the python object which wraps the
* parameters, handle their lifecycles but in some
* cases, where we have intermediate objects,
* or when we fail processing a parameter, we need
* to handle the clean up manually.
*
* There are two argument processing stages.
* They are the in stage, where we process python
* parameters into their C counterparts, and the out
* stage, where we process out C parameters back
* into python objects. The in stage also sets up
* temporary out structures for caller allocated
* parameters which need to be cleaned up either on
* in stage failure or at the completion of the out
* stage (either success or failure)
*
* The in stage must call one of these cleanup functions:
* - pygi_marshal_cleanup_args_from_py_marshal_success
* (continue to out stage)
* - pygi_marshal_cleanup_args_from_py_parameter_fail
* (final, exit from invoke)
*
* The out stage must call one of these cleanup functions which are all final:
* - pygi_marshal_cleanup_args_to_py_marshal_success
* - pygi_marshal_cleanup_args_return_fail
* - pygi_marshal_cleanup_args_to_py_parameter_fail
*
**/
void
pygi_marshal_cleanup_args_from_py_marshal_success (PyGIInvokeState *state,
PyGICallableCache *cache)
{
gssize i;
for (i = 0; i < _pygi_callable_cache_args_len (cache); i++) {
PyGIArgCache *arg_cache = _pygi_callable_cache_get_arg (cache, i);
PyGIMarshalCleanupFunc cleanup_func = arg_cache->from_py_cleanup;
gpointer cleanup_data = state->args_cleanup_data[i];
/* Only cleanup using args_cleanup_data when available.
* It is the responsibility of the various "from_py" marshalers to return
* cleanup_data which is then passed into their respective cleanup function.
* PyGIInvokeState.args_cleanup_data stores this data (via _invoke_marshal_in_args)
* for the duration of the invoke up until this point.
*/
if (cleanup_func && cleanup_data != NULL && arg_cache->py_arg_index >= 0 &&
arg_cache->direction & PYGI_DIRECTION_FROM_PYTHON) {
PyObject *py_arg = PyTuple_GET_ITEM (state->py_in_args, arg_cache->py_arg_index);
cleanup_func (state, arg_cache, py_arg, cleanup_data, TRUE);
state->args_cleanup_data[i] = NULL;
}
}
}
void
pygi_marshal_cleanup_args_to_py_marshal_success (PyGIInvokeState *state,
PyGICallableCache *cache)
{
GSList *cache_item;
/* clean up the return if available */
if (cache->return_cache != NULL) {
PyGIMarshalCleanupFunc cleanup_func = cache->return_cache->to_py_cleanup;
if (cleanup_func && state->return_arg.v_pointer != NULL)
cleanup_func (state,
cache->return_cache,
NULL,
state->return_arg.v_pointer,
TRUE);
}
/* Now clean up args */
cache_item = cache->to_py_args;
while (cache_item) {
PyGIArgCache *arg_cache = (PyGIArgCache *) cache_item->data;
PyGIMarshalCleanupFunc cleanup_func = arg_cache->to_py_cleanup;
gpointer data = state->arg_values[arg_cache->c_arg_index].v_pointer;
if (cleanup_func != NULL && data != NULL)
cleanup_func (state,
arg_cache,
NULL,
data,
TRUE);
else if (arg_cache->is_caller_allocates && data != NULL) {
_cleanup_caller_allocates (state,
arg_cache,
NULL,
data,
TRUE);
}
cache_item = cache_item->next;
}
}
void
pygi_marshal_cleanup_args_from_py_parameter_fail (PyGIInvokeState *state,
PyGICallableCache *cache,
gssize failed_arg_index)
{
gssize i;
state->failed = TRUE;
for (i = 0; i < _pygi_callable_cache_args_len (cache) && i <= failed_arg_index; i++) {
PyGIArgCache *arg_cache = _pygi_callable_cache_get_arg (cache, i);
PyGIMarshalCleanupFunc cleanup_func = arg_cache->from_py_cleanup;
gpointer cleanup_data = state->args_cleanup_data[i];
PyObject *py_arg = NULL;
if (arg_cache->py_arg_index < 0) {
continue;
}
py_arg = PyTuple_GET_ITEM (state->py_in_args, arg_cache->py_arg_index);
if (cleanup_func && cleanup_data != NULL &&
arg_cache->direction == PYGI_DIRECTION_FROM_PYTHON) {
cleanup_func (state,
arg_cache,
py_arg,
cleanup_data,
i < failed_arg_index);
} else if (arg_cache->is_caller_allocates && cleanup_data != NULL) {
_cleanup_caller_allocates (state,
arg_cache,
py_arg,
cleanup_data,
FALSE);
}
state->args_cleanup_data[i] = NULL;
}
}
void
pygi_marshal_cleanup_args_return_fail (PyGIInvokeState *state,
PyGICallableCache *cache)
{
state->failed = TRUE;
}
void
pygi_marshal_cleanup_args_to_py_parameter_fail (PyGIInvokeState *state,
PyGICallableCache *cache,
gssize failed_to_py_arg_index)
{
state->failed = TRUE;
}
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