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/**
* @file ref.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @section DESCRIPTION
*
* References module.
*
* Synopsis:
* refhere()
* Variables:
* Exposes variables and objects as seen from this refhere() statement.
*
* Synopsis:
* ref refhere::ref()
* ref ref::ref()
* Variables:
* Exposes variables and objects as seen from the corresponding refhere()
* statement.
*/
#include <stdlib.h>
#include <string.h>
#include <misc/offset.h>
#include <structure/LinkedList0.h>
#include <ncd/module_common.h>
#include <generated/blog_channel_ncd_ref.h>
struct refhere_instance {
NCDModuleInst *i;
LinkedList0 refs_list;
};
struct ref_instance {
NCDModuleInst *i;
struct refhere_instance *rh;
LinkedList0Node refs_list_node;
};
static void ref_instance_free (struct ref_instance *o);
static void refhere_func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
struct refhere_instance *o = vo;
o->i = i;
// check arguments
if (!NCDVal_ListRead(params->args, 0)) {
ModuleLog(o->i, BLOG_ERROR, "wrong arity");
goto fail0;
}
// init refs list
LinkedList0_Init(&o->refs_list);
// signal up
NCDModuleInst_Backend_Up(o->i);
return;
fail0:
NCDModuleInst_Backend_DeadError(i);
}
static void refhere_func_die (void *vo)
{
struct refhere_instance *o = vo;
// die refs
while (!LinkedList0_IsEmpty(&o->refs_list)) {
struct ref_instance *ref = UPPER_OBJECT(LinkedList0_GetFirst(&o->refs_list), struct ref_instance, refs_list_node);
ASSERT(ref->rh == o)
ref_instance_free(ref);
}
NCDModuleInst_Backend_Dead(o->i);
}
static int refhere_func_getobj (void *vo, NCD_string_id_t objname, NCDObject *out_object)
{
struct refhere_instance *o = vo;
// We don't redirect methods, and there will never be an object
// with empty name. Fail here so we don't report non-errors.
if (objname == NCD_STRING_EMPTY) {
return 0;
}
return NCDModuleInst_Backend_GetObj(o->i, objname, out_object);
}
static void ref_func_new_templ (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params, struct refhere_instance *rh)
{
struct ref_instance *o = vo;
o->i = i;
// check arguments
if (!NCDVal_ListRead(params->args, 0)) {
ModuleLog(o->i, BLOG_ERROR, "wrong arity");
goto fail0;
}
// set refhere
o->rh = rh;
// add to refhere's refs list
LinkedList0_Prepend(&o->rh->refs_list, &o->refs_list_node);
// signal up
NCDModuleInst_Backend_Up(o->i);
return;
fail0:
NCDModuleInst_Backend_DeadError(i);
}
static void ref_func_new_from_refhere (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
struct refhere_instance *rh = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user);
return ref_func_new_templ(vo, i, params, rh);
}
static void ref_func_new_from_ref (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
struct ref_instance *ref = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user);
return ref_func_new_templ(vo, i, params, ref->rh);
}
static void ref_instance_free (struct ref_instance *o)
{
// remove from refhere's reft list
LinkedList0_Remove(&o->rh->refs_list, &o->refs_list_node);
NCDModuleInst_Backend_Dead(o->i);
}
static void ref_func_die (void *vo)
{
struct ref_instance *o = vo;
ref_instance_free(o);
}
static int ref_func_getobj (void *vo, NCD_string_id_t objname, NCDObject *out_object)
{
struct ref_instance *o = vo;
// We don't redirect methods, and there will never be an object
// with empty name. Fail here so we don't report non-errors.
if (objname == NCD_STRING_EMPTY) {
return 0;
}
return NCDModuleInst_Backend_GetObj(o->rh->i, objname, out_object);
}
static struct NCDModule modules[] = {
{
.type = "refhere",
.func_new2 = refhere_func_new,
.func_die = refhere_func_die,
.func_getobj = refhere_func_getobj,
.alloc_size = sizeof(struct refhere_instance)
}, {
.type = "refhere::ref",
.base_type = "ref",
.func_new2 = ref_func_new_from_refhere,
.func_die = ref_func_die,
.func_getobj = ref_func_getobj,
.alloc_size = sizeof(struct ref_instance)
}, {
.type = "ref::ref",
.base_type = "ref",
.func_new2 = ref_func_new_from_ref,
.func_die = ref_func_die,
.func_getobj = ref_func_getobj,
.alloc_size = sizeof(struct ref_instance)
}, {
.type = NULL
}
};
const struct NCDModuleGroup ncdmodule_ref = {
.modules = modules
};