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+/*****************************************************************************
+
+Copyright (c) 1998, 2011, Oracle and/or its affiliates. All Rights Reserved.
+
+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; version 2 of the License.
+
+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.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
+
+*****************************************************************************/
+
+/**************************************************//**
+@file eval/eval0proc.cc
+Executes SQL stored procedures and their control structures
+
+Created 1/20/1998 Heikki Tuuri
+*******************************************************/
+
+#include "eval0proc.h"
+
+#ifdef UNIV_NONINL
+#include "eval0proc.ic"
+#endif
+
+/**********************************************************************//**
+Performs an execution step of an if-statement node.
+@return query thread to run next or NULL */
+UNIV_INTERN
+que_thr_t*
+if_step(
+/*====*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ if_node_t* node;
+ elsif_node_t* elsif_node;
+
+ ut_ad(thr);
+
+ node = static_cast<if_node_t*>(thr->run_node);
+ ut_ad(que_node_get_type(node) == QUE_NODE_IF);
+
+ if (thr->prev_node == que_node_get_parent(node)) {
+
+ /* Evaluate the condition */
+
+ eval_exp(node->cond);
+
+ if (eval_node_get_ibool_val(node->cond)) {
+
+ /* The condition evaluated to TRUE: start execution
+ from the first statement in the statement list */
+
+ thr->run_node = node->stat_list;
+
+ } else if (node->else_part) {
+ thr->run_node = node->else_part;
+
+ } else if (node->elsif_list) {
+ elsif_node = node->elsif_list;
+
+ for (;;) {
+ eval_exp(elsif_node->cond);
+
+ if (eval_node_get_ibool_val(
+ elsif_node->cond)) {
+
+ /* The condition evaluated to TRUE:
+ start execution from the first
+ statement in the statement list */
+
+ thr->run_node = elsif_node->stat_list;
+
+ break;
+ }
+
+ elsif_node = static_cast<elsif_node_t*>(
+ que_node_get_next(elsif_node));
+
+ if (elsif_node == NULL) {
+ thr->run_node = NULL;
+
+ break;
+ }
+ }
+ } else {
+ thr->run_node = NULL;
+ }
+ } else {
+ /* Move to the next statement */
+ ut_ad(que_node_get_next(thr->prev_node) == NULL);
+
+ thr->run_node = NULL;
+ }
+
+ if (thr->run_node == NULL) {
+ thr->run_node = que_node_get_parent(node);
+ }
+
+ return(thr);
+}
+
+/**********************************************************************//**
+Performs an execution step of a while-statement node.
+@return query thread to run next or NULL */
+UNIV_INTERN
+que_thr_t*
+while_step(
+/*=======*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ while_node_t* node;
+
+ ut_ad(thr);
+
+ node = static_cast<while_node_t*>(thr->run_node);
+ ut_ad(que_node_get_type(node) == QUE_NODE_WHILE);
+
+ ut_ad((thr->prev_node == que_node_get_parent(node))
+ || (que_node_get_next(thr->prev_node) == NULL));
+
+ /* Evaluate the condition */
+
+ eval_exp(node->cond);
+
+ if (eval_node_get_ibool_val(node->cond)) {
+
+ /* The condition evaluated to TRUE: start execution
+ from the first statement in the statement list */
+
+ thr->run_node = node->stat_list;
+ } else {
+ thr->run_node = que_node_get_parent(node);
+ }
+
+ return(thr);
+}
+
+/**********************************************************************//**
+Performs an execution step of an assignment statement node.
+@return query thread to run next or NULL */
+UNIV_INTERN
+que_thr_t*
+assign_step(
+/*========*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ assign_node_t* node;
+
+ ut_ad(thr);
+
+ node = static_cast<assign_node_t*>(thr->run_node);
+ ut_ad(que_node_get_type(node) == QUE_NODE_ASSIGNMENT);
+
+ /* Evaluate the value to assign */
+
+ eval_exp(node->val);
+
+ eval_node_copy_val(node->var->alias, node->val);
+
+ thr->run_node = que_node_get_parent(node);
+
+ return(thr);
+}
+
+/**********************************************************************//**
+Performs an execution step of a for-loop node.
+@return query thread to run next or NULL */
+UNIV_INTERN
+que_thr_t*
+for_step(
+/*=====*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ for_node_t* node;
+ que_node_t* parent;
+ lint loop_var_value;
+
+ ut_ad(thr);
+
+ node = static_cast<for_node_t*>(thr->run_node);
+
+ ut_ad(que_node_get_type(node) == QUE_NODE_FOR);
+
+ parent = que_node_get_parent(node);
+
+ if (thr->prev_node != parent) {
+
+ /* Move to the next statement */
+ thr->run_node = que_node_get_next(thr->prev_node);
+
+ if (thr->run_node != NULL) {
+
+ return(thr);
+ }
+
+ /* Increment the value of loop_var */
+
+ loop_var_value = 1 + eval_node_get_int_val(node->loop_var);
+ } else {
+ /* Initialize the loop */
+
+ eval_exp(node->loop_start_limit);
+ eval_exp(node->loop_end_limit);
+
+ loop_var_value = eval_node_get_int_val(node->loop_start_limit);
+
+ node->loop_end_value
+ = (int) eval_node_get_int_val(node->loop_end_limit);
+ }
+
+ /* Check if we should do another loop */
+
+ if (loop_var_value > node->loop_end_value) {
+
+ /* Enough loops done */
+
+ thr->run_node = parent;
+ } else {
+ eval_node_set_int_val(node->loop_var, loop_var_value);
+
+ thr->run_node = node->stat_list;
+ }
+
+ return(thr);
+}
+
+/**********************************************************************//**
+Performs an execution step of an exit statement node.
+@return query thread to run next or NULL */
+UNIV_INTERN
+que_thr_t*
+exit_step(
+/*======*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ exit_node_t* node;
+ que_node_t* loop_node;
+
+ ut_ad(thr);
+
+ node = static_cast<exit_node_t*>(thr->run_node);
+
+ ut_ad(que_node_get_type(node) == QUE_NODE_EXIT);
+
+ /* Loops exit by setting thr->run_node as the loop node's parent, so
+ find our containing loop node and get its parent. */
+
+ loop_node = que_node_get_containing_loop_node(node);
+
+ /* If someone uses an EXIT statement outside of a loop, this will
+ trigger. */
+ ut_a(loop_node);
+
+ thr->run_node = que_node_get_parent(loop_node);
+
+ return(thr);
+}
+
+/**********************************************************************//**
+Performs an execution step of a return-statement node.
+@return query thread to run next or NULL */
+UNIV_INTERN
+que_thr_t*
+return_step(
+/*========*/
+ que_thr_t* thr) /*!< in: query thread */
+{
+ return_node_t* node;
+ que_node_t* parent;
+
+ ut_ad(thr);
+
+ node = static_cast<return_node_t*>(thr->run_node);
+
+ ut_ad(que_node_get_type(node) == QUE_NODE_RETURN);
+
+ parent = node;
+
+ while (que_node_get_type(parent) != QUE_NODE_PROC) {
+
+ parent = que_node_get_parent(parent);
+ }
+
+ ut_a(parent);
+
+ thr->run_node = que_node_get_parent(parent);
+
+ return(thr);
+}