1/*****************************************************************************
2
3Copyright (c) 1998, 2011, Oracle and/or its affiliates. All Rights Reserved.
4
5This program is free software; you can redistribute it and/or modify
6it under the terms of the GNU General Public License, version 2.0,
7as published by the Free Software Foundation.
8
9This program is also distributed with certain software (including
10but not limited to OpenSSL) that is licensed under separate terms,
11as designated in a particular file or component or in included license
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13permission to link the program and your derivative works with the
14separately licensed software that they have included with MySQL.
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16This program is distributed in the hope that it will be useful,
17but WITHOUT ANY WARRANTY; without even the implied warranty of
18MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19GNU General Public License, version 2.0, for more details.
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21You should have received a copy of the GNU General Public License along with
22this program; if not, write to the Free Software Foundation, Inc.,
2351 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
24
25*****************************************************************************/
26
27/**************************************************//**
28@file include/eval0proc.ic
29Executes SQL stored procedures and their control structures
30
31Created 1/20/1998 Heikki Tuuri
32*******************************************************/
33
34#include "pars0pars.h"
35#include "que0que.h"
36#include "eval0eval.h"
37
38/**********************************************************************//**
39Performs an execution step of a procedure node.
40@return	query thread to run next or NULL */
41UNIV_INLINE
42que_thr_t*
43proc_step(
44/*======*/
45	que_thr_t*	thr)	/*!< in: query thread */
46{
47	proc_node_t*	node;
48
49	ut_ad(thr);
50
51	node = static_cast<proc_node_t*>(thr->run_node);
52	ut_ad(que_node_get_type(node) == QUE_NODE_PROC);
53
54	if (thr->prev_node == que_node_get_parent(node)) {
55		/* Start execution from the first statement in the statement
56		list */
57
58		thr->run_node = node->stat_list;
59	} else {
60		/* Move to the next statement */
61		ut_ad(que_node_get_next(thr->prev_node) == NULL);
62
63		thr->run_node = NULL;
64	}
65
66	if (thr->run_node == NULL) {
67		thr->run_node = que_node_get_parent(node);
68	}
69
70	return(thr);
71}
72
73/**********************************************************************//**
74Performs an execution step of a procedure call node.
75@return	query thread to run next or NULL */
76UNIV_INLINE
77que_thr_t*
78proc_eval_step(
79/*===========*/
80	que_thr_t*	thr)	/*!< in: query thread */
81{
82	func_node_t*	node;
83
84	ut_ad(thr);
85
86	node = static_cast<func_node_t*>(thr->run_node);
87	ut_ad(que_node_get_type(node) == QUE_NODE_FUNC);
88
89	/* Evaluate the procedure */
90
91	eval_exp(node);
92
93	thr->run_node = que_node_get_parent(node);
94
95	return(thr);
96}
97