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/*
* Copyright (c) 2023 Balazs Scheidler <balazs.scheidler@axoflow.com>
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "filterx-object.h"
#include "filterx-eval.h"
#include "mainloop-worker.h"
#include "filterx/object-primitive.h"
#include "filterx/object-string.h"
#include "filterx/filterx-globals.h"
FilterXObject *
filterx_object_getattr_string(FilterXObject *self, const gchar *attr_name)
{
FilterXObject *attr = filterx_string_new(attr_name, -1);
FilterXObject *res = filterx_object_getattr(self, attr);
filterx_object_unref(attr);
return res;
}
gboolean
filterx_object_setattr_string(FilterXObject *self, const gchar *attr_name, FilterXObject **new_value)
{
FilterXObject *attr = filterx_string_new(attr_name, -1);
gboolean res = filterx_object_setattr(self, attr, new_value);
filterx_object_unref(attr);
return res;
}
#define INIT_TYPE_METHOD(type, method_name) do { \
if (type->method_name) \
break; \
FilterXType *super_type = type->super_type; \
while (super_type) \
{ \
if (super_type->method_name) \
{ \
type->method_name = super_type->method_name; \
break; \
} \
super_type = super_type->super_type; \
} \
} while (0)
void
filterx_type_init(FilterXType *type)
{
INIT_TYPE_METHOD(type, unmarshal);
INIT_TYPE_METHOD(type, marshal);
INIT_TYPE_METHOD(type, clone);
INIT_TYPE_METHOD(type, map_to_json);
INIT_TYPE_METHOD(type, truthy);
INIT_TYPE_METHOD(type, getattr);
INIT_TYPE_METHOD(type, setattr);
INIT_TYPE_METHOD(type, get_subscript);
INIT_TYPE_METHOD(type, set_subscript);
INIT_TYPE_METHOD(type, is_key_set);
INIT_TYPE_METHOD(type, unset_key);
INIT_TYPE_METHOD(type, list_factory);
INIT_TYPE_METHOD(type, dict_factory);
INIT_TYPE_METHOD(type, repr);
INIT_TYPE_METHOD(type, len);
INIT_TYPE_METHOD(type, free_fn);
if (!filterx_type_register(type->name, type))
msg_error("Reregistering filterx type", evt_tag_str("name", type->name));
}
#define FILTERX_OBJECT_MAGIC_BIAS G_MAXINT32
void
filterx_object_free_method(FilterXObject *self)
{
/* empty */
}
void
filterx_object_init_instance(FilterXObject *self, FilterXType *type)
{
self->ref_cnt = 1;
self->type = type;
self->thread_index = (guint16) main_loop_worker_get_thread_index();
self->readonly = !type->is_mutable;
}
FilterXObject *
filterx_object_new(FilterXType *type)
{
FilterXObject *self = g_new0(FilterXObject, 1);
filterx_object_init_instance(self, type);
return self;
}
gboolean
filterx_object_freeze(FilterXObject *self)
{
if (filterx_object_is_frozen(self))
return FALSE;
g_assert(self->ref_cnt == 1);
self->ref_cnt = FILTERX_OBJECT_MAGIC_BIAS;
return TRUE;
}
gboolean
filterx_object_is_frozen(FilterXObject *self)
{
return self->ref_cnt == FILTERX_OBJECT_MAGIC_BIAS;
}
void
filterx_object_unfreeze_and_free(FilterXObject *self)
{
g_assert(filterx_object_is_frozen(self));
self->ref_cnt = 1;
filterx_object_unref(self);
}
FilterXObject *
filterx_object_ref(FilterXObject *self)
{
if (!self)
return NULL;
if (filterx_object_is_frozen(self))
return self;
self->ref_cnt++;
return self;
}
void
filterx_object_unref(FilterXObject *self)
{
if (!self)
return;
if (filterx_object_is_frozen(self))
return;
/* this asserts that the 16 bit wide thread_index suffices to hold a
* thread identifier.
*
* NOTE the definition of FilterXObject where the * thread_index is a 16 bit bitfield.
*
* NOTE/2: thread_index might be -1 to indicate unset state. So the valid
* range of values is 0..65534, as 65535 would be -1.
*
*/
G_STATIC_ASSERT(MAIN_LOOP_MAX_WORKER_THREADS < ((1 << 16) - 1));
g_assert(self->ref_cnt > 0);
if (--self->ref_cnt == 0)
{
/* FilterXObjects may not cross a thread boundary as their refcount is
* not atomic, let's validate that. */
/* NOTE: we are only validating the thread_id when we actually reach
* ref_cnt 0 for performance reasons. This means we are not
* validating all unref calls. But it's quite likely that the final
* unref call would come from the thread that we passed our reference
* to.
*
* We could be stricter at the cost of some performance but there's a
* very good chance that if we ever do hand over FilterXObject
* instances across a thread boundary, we will trip on the assert
* below, during testing. */
g_assert(self->thread_index == (guint16) main_loop_worker_get_thread_index());
self->type->free_fn(self);
g_free(self);
}
}
FilterXType FILTERX_TYPE_NAME(object) =
{
.super_type = NULL,
.name = "object",
.free_fn = filterx_object_free_method,
};
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