/*
  +----------------------------------------------------------------------+
  | Copyright © The PHP Group and Contributors.                          |
  +----------------------------------------------------------------------+
  | This source file is subject to the Modified BSD License that is      |
  | bundled with this package in the file LICENSE, and is available      |
  | through the World Wide Web at <https://www.php.net/license/>.        |
  |                                                                      |
  | SPDX-License-Identifier: BSD-3-Clause                                |
  +----------------------------------------------------------------------+
  | Authors: Andrey Hristov <andrey@php.net>                             |
  |          Ulf Wendel <uw@php.net>                                     |
  |          Dmitry Stogov <dmitry@php.net>                              |
  +----------------------------------------------------------------------+
*/

#include "php.h"
#include "mysqlnd.h"
#include "mysqlnd_block_alloc.h"
#include "mysqlnd_debug.h"
#include "mysqlnd_priv.h"

/* {{{ mysqlnd_mempool_get_chunk */
static void *
mysqlnd_mempool_get_chunk(MYSQLND_MEMORY_POOL * pool, size_t size)
{
	DBG_ENTER("mysqlnd_mempool_get_chunk");
	DBG_RETURN(zend_arena_alloc(&pool->arena, size));
}
/* }}} */


/* {{{ mysqlnd_mempool_create */
PHPAPI MYSQLND_MEMORY_POOL *
mysqlnd_mempool_create(size_t arena_size)
{
	zend_arena * arena;
	MYSQLND_MEMORY_POOL * ret;

	DBG_ENTER("mysqlnd_mempool_create");
	arena = zend_arena_create(MAX(arena_size, ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena))));
	ret = zend_arena_alloc(&arena, sizeof(MYSQLND_MEMORY_POOL));
	ret->arena = arena;
	ret->checkpoint = NULL;
	ret->get_chunk = mysqlnd_mempool_get_chunk;
	DBG_RETURN(ret);
}
/* }}} */


/* {{{ mysqlnd_mempool_destroy */
PHPAPI void
mysqlnd_mempool_destroy(MYSQLND_MEMORY_POOL * pool)
{
	DBG_ENTER("mysqlnd_mempool_destroy");
	/* mnd_free will reference LOCK_access and might crash, depending on the caller...*/
	zend_arena_destroy(pool->arena);
	DBG_VOID_RETURN;
}
/* }}} */

/* {{{ mysqlnd_mempool_save_state */
PHPAPI void
mysqlnd_mempool_save_state(MYSQLND_MEMORY_POOL * pool)
{
	DBG_ENTER("mysqlnd_mempool_save_state");
	pool->checkpoint = zend_arena_checkpoint(pool->arena);
	DBG_VOID_RETURN;
}
/* }}} */

/* {{{ mysqlnd_mempool_restore_state */
PHPAPI void
mysqlnd_mempool_restore_state(MYSQLND_MEMORY_POOL * pool)
{
	DBG_ENTER("mysqlnd_mempool_restore_state");
#if ZEND_DEBUG
	ZEND_ASSERT(pool->checkpoint);
#endif
	if (pool->checkpoint) {
		zend_arena_release(&pool->arena, pool->checkpoint);
		pool->checkpoint = NULL;
	}
	DBG_VOID_RETURN;
}
/* }}} */
