549 lines
14 KiB
C
549 lines
14 KiB
C
/**
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* @file dynamic_depend.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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* Dynamic dependencies module.
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*
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* Synopsis: dynamic_provide(string name, order_value)
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* Synopsis: dynamic_depend(string name)
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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 <misc/debug.h>
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#include <misc/compare.h>
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#include <misc/strdup.h>
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#include <misc/balloc.h>
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#include <structure/LinkedList0.h>
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#include <structure/BAVL.h>
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#include <ncd/NCDModule.h>
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#include <generated/blog_channel_ncd_dynamic_depend.h>
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#define ModuleLog(i, ...) NCDModuleInst_Backend_Log((i), BLOG_CURRENT_CHANNEL, __VA_ARGS__)
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#define ModuleGlobal(i) ((i)->m->group->group_state)
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struct provide;
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struct name_string {
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char *data;
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size_t len;
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};
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struct name {
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struct global *g;
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struct name_string name;
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BAVLNode names_tree_node;
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BAVL provides_tree;
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LinkedList0 waiting_depends_list;
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struct provide *cur_p;
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LinkedList0 cur_bound_depends_list;
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int cur_resetting;
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};
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struct provide {
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NCDModuleInst *i;
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struct name *n;
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NCDValRef order_value;
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BAVLNode provides_tree_node;
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int dying;
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};
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struct depend {
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NCDModuleInst *i;
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struct name *n;
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int is_bound;
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LinkedList0Node depends_list_node;
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};
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struct global {
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BAVL names_tree;
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};
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static void provide_free (struct provide *o);
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static void depend_free (struct depend *o);
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static int name_string_comparator (void *user, void *vv1, void *vv2)
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{
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struct name_string *v1 = vv1;
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struct name_string *v2 = vv2;
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size_t min_len = (v1->len < v2->len ? v1->len : v2->len);
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int cmp = memcmp(v1->data, v2->data, min_len);
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if (cmp) {
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return B_COMPARE(cmp, 0);
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}
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return B_COMPARE(v1->len, v2->len);
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}
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static int val_comparator (void *user, NCDValRef *v1, NCDValRef *v2)
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{
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return NCDVal_Compare(*v1, *v2);
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}
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static struct name * find_name (struct global *g, const char *name, size_t name_len)
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{
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struct name_string ns = {(char *)name, name_len};
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BAVLNode *tn = BAVL_LookupExact(&g->names_tree, &ns);
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if (!tn) {
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return NULL;
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}
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struct name *n = UPPER_OBJECT(tn, struct name, names_tree_node);
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ASSERT(n->name.len == name_len)
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ASSERT(!memcmp(n->name.data, name, name_len))
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return n;
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}
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static struct name * name_init (NCDModuleInst *i, struct global *g, const char *name, size_t name_len)
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{
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ASSERT(!find_name(g, name, name_len))
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// allocate structure
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struct name *o = malloc(sizeof(*o));
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if (!o) {
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ModuleLog(i, BLOG_ERROR, "malloc failed");
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goto fail0;
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}
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// set global state
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o->g = g;
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// copy name
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if (!(o->name.data = b_strdup_bin(name, name_len))) {
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ModuleLog(i, BLOG_ERROR, "strdup failed");
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goto fail1;
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}
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o->name.len = name_len;
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// insert to names tree
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ASSERT_EXECUTE(BAVL_Insert(&g->names_tree, &o->names_tree_node, NULL))
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// init provides tree
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BAVL_Init(&o->provides_tree, OFFSET_DIFF(struct provide, order_value, provides_tree_node), (BAVL_comparator)val_comparator, NULL);
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// init waiting depends list
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LinkedList0_Init(&o->waiting_depends_list);
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// set no current provide
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o->cur_p = NULL;
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return o;
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fail1:
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free(o);
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fail0:
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return NULL;
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}
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static void name_free (struct name *o)
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{
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ASSERT(BAVL_IsEmpty(&o->provides_tree))
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ASSERT(LinkedList0_IsEmpty(&o->waiting_depends_list))
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ASSERT(!o->cur_p)
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// remove from names tree
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BAVL_Remove(&o->g->names_tree, &o->names_tree_node);
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// free name
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free(o->name.data);
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// free structure
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free(o);
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}
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static struct provide * name_get_first_provide (struct name *o)
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{
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BAVLNode *tn = BAVL_GetFirst(&o->provides_tree);
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if (!tn) {
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return NULL;
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}
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struct provide *p = UPPER_OBJECT(tn, struct provide, provides_tree_node);
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ASSERT(p->n == o)
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return p;
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}
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static void name_new_current (struct name *o)
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{
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ASSERT(!o->cur_p)
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ASSERT(!BAVL_IsEmpty(&o->provides_tree))
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// set current provide
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o->cur_p = name_get_first_provide(o);
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// init bound depends list
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LinkedList0_Init(&o->cur_bound_depends_list);
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// set not resetting
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o->cur_resetting = 0;
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// bind waiting depends
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while (!LinkedList0_IsEmpty(&o->waiting_depends_list)) {
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struct depend *d = UPPER_OBJECT(LinkedList0_GetFirst(&o->waiting_depends_list), struct depend, depends_list_node);
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ASSERT(d->n == o)
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ASSERT(!d->is_bound)
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// remove from waiting depends list
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LinkedList0_Remove(&o->waiting_depends_list, &d->depends_list_node);
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// set bound
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d->is_bound = 1;
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// add to bound depends list
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LinkedList0_Prepend(&o->cur_bound_depends_list, &d->depends_list_node);
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// signal up
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NCDModuleInst_Backend_Up(d->i);
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}
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}
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static void name_free_if_unused (struct name *o)
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{
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if (BAVL_IsEmpty(&o->provides_tree) && LinkedList0_IsEmpty(&o->waiting_depends_list)) {
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name_free(o);
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}
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}
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static void name_continue_resetting (struct name *o)
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{
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ASSERT(o->cur_p)
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ASSERT(o->cur_resetting)
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// still have bound depends?
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if (!LinkedList0_IsEmpty(&o->cur_bound_depends_list)) {
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return;
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}
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struct provide *old_p = o->cur_p;
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// set no current provide
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o->cur_p = NULL;
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// free old current provide if it's dying
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if (old_p->dying) {
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provide_free(old_p);
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}
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if (!BAVL_IsEmpty(&o->provides_tree)) {
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// get new current provide
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name_new_current(o);
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} else {
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// free name if unused
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name_free_if_unused(o);
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}
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}
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static void name_start_resetting (struct name *o)
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{
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ASSERT(o->cur_p)
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ASSERT(!o->cur_resetting)
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// set resetting
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o->cur_resetting = 1;
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// signal bound depends down
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for (LinkedList0Node *ln = LinkedList0_GetFirst(&o->cur_bound_depends_list); ln; ln = LinkedList0Node_Next(ln)) {
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struct depend *d = UPPER_OBJECT(ln, struct depend, depends_list_node);
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ASSERT(d->n == o)
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ASSERT(d->is_bound)
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NCDModuleInst_Backend_Down(d->i);
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}
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// if there were no bound depends, continue right away
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name_continue_resetting(o);
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}
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static int func_globalinit (struct NCDInterpModuleGroup *group, const struct NCDModuleInst_iparams *params)
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{
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// allocate global state structure
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struct global *g = BAlloc(sizeof(*g));
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if (!g) {
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BLog(BLOG_ERROR, "BAlloc failed");
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return 0;
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}
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// set group state pointer
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group->group_state = g;
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// init names tree
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BAVL_Init(&g->names_tree, OFFSET_DIFF(struct name, name, names_tree_node), name_string_comparator, NULL);
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return 1;
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}
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static void func_globalfree (struct NCDInterpModuleGroup *group)
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{
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struct global *g = group->group_state;
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ASSERT(BAVL_IsEmpty(&g->names_tree))
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// free global state structure
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BFree(g);
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}
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static void provide_func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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struct global *g = ModuleGlobal(i);
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struct provide *o = vo;
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o->i = i;
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// read arguments
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NCDValRef name_arg;
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if (!NCDVal_ListRead(params->args, 2, &name_arg, &o->order_value)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(name_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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const char *name_str = NCDVal_StringData(name_arg);
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size_t name_len = NCDVal_StringLength(name_arg);
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// find name, create new if needed
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struct name *n = find_name(g, name_str, name_len);
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if (!n && !(n = name_init(i, g, name_str, name_len))) {
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goto fail0;
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}
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// set name
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o->n = n;
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// check for order value conflict
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if (BAVL_LookupExact(&n->provides_tree, &o->order_value)) {
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ModuleLog(i, BLOG_ERROR, "order value already exists");
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goto fail0;
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}
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// add to name's provides tree
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ASSERT_EXECUTE(BAVL_Insert(&n->provides_tree, &o->provides_tree_node, NULL))
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// set not dying
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o->dying = 0;
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// signal up
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NCDModuleInst_Backend_Up(i);
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// should this be the current provide?
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if (o == name_get_first_provide(n)) {
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if (!n->cur_p) {
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name_new_current(n);
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}
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else if (!n->cur_resetting) {
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name_start_resetting(n);
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}
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}
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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 provide_free (struct provide *o)
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{
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struct name *n = o->n;
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ASSERT(o->dying)
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ASSERT(o != n->cur_p)
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// remove from name's provides tree
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BAVL_Remove(&n->provides_tree, &o->provides_tree_node);
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NCDModuleInst_Backend_Dead(o->i);
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}
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static void provide_func_die (void *vo)
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{
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struct provide *o = vo;
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struct name *n = o->n;
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ASSERT(!o->dying)
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// set dying
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o->dying = 1;
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// if this is not the current provide, die right away
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if (o != n->cur_p) {
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// free provide
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provide_free(o);
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// free name if unused
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name_free_if_unused(n);
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return;
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}
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ASSERT(!n->cur_resetting)
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// start resetting
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name_start_resetting(n);
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}
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static void depend_func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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struct global *g = ModuleGlobal(i);
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struct depend *o = vo;
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o->i = i;
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// read arguments
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NCDValRef name_arg;
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if (!NCDVal_ListRead(params->args, 1, &name_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(name_arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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const char *name_str = NCDVal_StringData(name_arg);
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size_t name_len = NCDVal_StringLength(name_arg);
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// find name, create new if needed
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struct name *n = find_name(g, name_str, name_len);
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if (!n && !(n = name_init(i, g, name_str, name_len))) {
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goto fail0;
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}
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// set name
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o->n = n;
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if (n->cur_p && !n->cur_resetting) {
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// set bound
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o->is_bound = 1;
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// add to bound depends list
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LinkedList0_Prepend(&n->cur_bound_depends_list, &o->depends_list_node);
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// signal up
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NCDModuleInst_Backend_Up(i);
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} else {
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// set not bound
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o->is_bound = 0;
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// add to waiting depends list
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LinkedList0_Prepend(&n->waiting_depends_list, &o->depends_list_node);
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}
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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 depend_func_die (void *vo)
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{
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struct depend *o = vo;
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struct name *n = o->n;
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if (o->is_bound) {
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ASSERT(n->cur_p)
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// remove from bound depends list
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LinkedList0_Remove(&n->cur_bound_depends_list, &o->depends_list_node);
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// continue resetting
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if (n->cur_resetting) {
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name_continue_resetting(n);
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}
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} else {
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// remove from waiting depends list
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LinkedList0_Remove(&n->waiting_depends_list, &o->depends_list_node);
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// free name if unused
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name_free_if_unused(n);
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}
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NCDModuleInst_Backend_Dead(o->i);
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}
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static void depend_func_clean (void *vo)
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{
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struct depend *o = vo;
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struct name *n = o->n;
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ASSERT(!o->is_bound || n->cur_p)
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if (!(o->is_bound && n->cur_resetting)) {
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return;
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}
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// remove from bound depends list
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LinkedList0_Remove(&n->cur_bound_depends_list, &o->depends_list_node);
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// set not bound
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o->is_bound = 0;
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// add to waiting depends list
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LinkedList0_Prepend(&n->waiting_depends_list, &o->depends_list_node);
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// continue resetting
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name_continue_resetting(n);
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}
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static int depend_func_getobj (void *vo, NCD_string_id_t objname, NCDObject *out_object)
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{
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struct depend *o = vo;
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struct name *n = o->n;
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ASSERT(!o->is_bound || n->cur_p)
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if (!o->is_bound) {
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return 0;
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}
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return NCDModuleInst_Backend_GetObj(n->cur_p->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 = "dynamic_provide",
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.func_new2 = provide_func_new,
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.func_die = provide_func_die,
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.alloc_size = sizeof(struct provide)
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}, {
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.type = "dynamic_depend",
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.func_new2 = depend_func_new,
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.func_die = depend_func_die,
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.func_clean = depend_func_clean,
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.func_getobj = depend_func_getobj,
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.flags = NCDMODULE_FLAG_CAN_RESOLVE_WHEN_DOWN,
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.alloc_size = sizeof(struct depend)
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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_dynamic_depend = {
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.func_globalinit = func_globalinit,
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.func_globalfree = func_globalfree,
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.modules = modules
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};
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