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/* State lists and hash tables, for libreswan
*
* Copyright (C) 2015-2019 Andrew Cagney <cagney@gnu.org>
* Copyright (C) 2019 D. Hugh Redelmeier <hugh@mimosa.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* This program 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 General Public License
* for more details.
*/
#include <stdint.h>
#include "passert.h"
#include "defs.h"
#include "log.h"
#include "hash_table.h"
#define passert_entry(ENTRY, ASSERTION) \
{ \
bool a_ = ASSERTION; /* evaluate once */ \
if (!a_) { \
JAMBUF(buf) { \
jam(buf, "%s: ", \
(ENTRY)->info->name); \
jam_list_entry(buf, (ENTRY)); \
jam(buf, ": %s", #ASSERTION); \
/* XXX: hack: double copy */ \
log_pexpect(HERE, PRI_SHUNK, \
pri_shunk(jambuf_as_shunk(buf))); \
} \
} \
}
#define passert_info(INFO, ASSERTION) \
{ \
bool a_ = ASSERTION; /* evaluate once */ \
if (!a_) { \
JAMBUF(buf) { \
jam(buf, "%s: %s", \
(INFO)->name, \
#ASSERTION); \
/* XXX: hack: double copy */ \
log_pexpect(HERE, PRI_SHUNK, \
pri_shunk(jambuf_as_shunk(buf))); \
} \
} \
}
void jam_list_entry(struct jambuf *buf, const struct list_entry *entry)
{
if (entry == NULL) {
jam(buf, "(null)");
} else {
if (entry->data == NULL) {
jam(buf, "HEAD");
} else {
entry->info->jam(buf, entry->data);
}
jam(buf, " %p<-%p->%p", entry->older, entry, entry->newer);
}
}
static void log_entry(const char *op, struct list_entry *entry)
{
passert(entry != NULL);
if (DBGP(DBG_TMI)) {
LSWLOG_DEBUG(buf) {
jam(buf, "%s: %s ", entry->info->name, op);
jam_list_entry(buf, entry);
}
}
if (entry->newer != NULL || entry->older != NULL) {
passert_entry(entry, entry->newer != NULL);
passert_entry(entry, entry->newer->older == entry);
passert_entry(entry, entry->older != NULL);
passert_entry(entry, entry->older->newer == entry);
}
}
struct list_entry list_entry(const struct list_info *info,
void *data)
{
passert_info(info, info != NULL);
passert_info(info, data != NULL);
return (struct list_entry) {
.older = NULL,
.newer = NULL,
.data = data,
.info = info,
};
}
bool detached_list_entry(const struct list_entry *entry)
{
passert_entry(entry, entry->data != NULL); /* entry is not a list head */
passert_entry(entry, (entry->newer == NULL) == (entry->newer == NULL));
return entry->newer == NULL;
}
void insert_list_entry(struct list_head *list,
struct list_entry *entry)
{
passert_entry(entry, entry->info != NULL);
passert_entry(entry, entry->data != NULL);
if (DBGP(DBG_TMI)) {
LSWLOG_DEBUG(buf) {
jam(buf, "%s: inserting ",
entry->info->name);
jam_list_entry(buf, entry);
jam(buf, " into list ");
jam_list_entry(buf, &list->head);
}
}
passert_entry(entry, list->head.info == entry->info);
passert_entry(entry, entry->data != NULL);
passert_entry(entry, entry->older == NULL && entry->newer == NULL);
passert_entry(entry, list->head.newer != NULL && list->head.older != NULL);
/* insert at the front */
entry->newer = &list->head;
entry->older = list->head.older;
entry->older->newer = entry;
entry->newer->older = entry;
/* list->newer = list->newer; */
if (DBGP(DBG_TMI)) {
LSWLOG_DEBUG(buf) {
jam(buf, "%s: inserted ",
entry->info->name);
jam_list_entry(buf, entry);
jam(buf, " into list ");
jam_list_entry(buf, &list->head);
}
}
}
void remove_list_entry(struct list_entry *entry)
{
log_entry("removing", entry);
/* entry is not a list head */
passert_entry(entry, entry->data != NULL);
/* unlink: older - entry - newer */
struct list_entry *newer = entry->newer;
struct list_entry *older = entry->older;
passert_entry(entry, older != NULL && newer != NULL);
entry->older = NULL; /* detach from list */
entry->newer = NULL;
newer->older = older; /* seal the rift */
older->newer = newer;
if (older == newer) {
DBGF(DBG_TMI, "%s: empty", entry->info->name);
} else {
log_entry("updated older", older);
log_entry("updated newer ", newer);
}
}
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