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