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286 lines
6.6 KiB
C++
286 lines
6.6 KiB
C++
/*****************************************************************************
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Copyright (c) 1998, 2016, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file eval/eval0proc.cc
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Executes SQL stored procedures and their control structures
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Created 1/20/1998 Heikki Tuuri
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*******************************************************/
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#include "eval0proc.h"
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/**********************************************************************//**
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Performs an execution step of an if-statement node.
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@return query thread to run next or NULL */
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que_thr_t*
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if_step(
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/*====*/
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que_thr_t* thr) /*!< in: query thread */
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{
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if_node_t* node;
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elsif_node_t* elsif_node;
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ut_ad(thr);
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node = static_cast<if_node_t*>(thr->run_node);
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ut_ad(que_node_get_type(node) == QUE_NODE_IF);
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if (thr->prev_node == que_node_get_parent(node)) {
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/* Evaluate the condition */
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eval_exp(node->cond);
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if (eval_node_get_ibool_val(node->cond)) {
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/* The condition evaluated to TRUE: start execution
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from the first statement in the statement list */
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thr->run_node = node->stat_list;
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} else if (node->else_part) {
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thr->run_node = node->else_part;
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} else if (node->elsif_list) {
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elsif_node = node->elsif_list;
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for (;;) {
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eval_exp(elsif_node->cond);
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if (eval_node_get_ibool_val(
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elsif_node->cond)) {
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/* The condition evaluated to TRUE:
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start execution from the first
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statement in the statement list */
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thr->run_node = elsif_node->stat_list;
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break;
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}
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elsif_node = static_cast<elsif_node_t*>(
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que_node_get_next(elsif_node));
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if (elsif_node == NULL) {
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thr->run_node = NULL;
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break;
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}
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}
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} else {
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thr->run_node = NULL;
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}
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} else {
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/* Move to the next statement */
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ut_ad(que_node_get_next(thr->prev_node) == NULL);
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thr->run_node = NULL;
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}
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if (thr->run_node == NULL) {
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thr->run_node = que_node_get_parent(node);
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}
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return(thr);
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}
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/**********************************************************************//**
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Performs an execution step of a while-statement node.
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@return query thread to run next or NULL */
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que_thr_t*
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while_step(
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/*=======*/
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que_thr_t* thr) /*!< in: query thread */
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{
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while_node_t* node;
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ut_ad(thr);
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node = static_cast<while_node_t*>(thr->run_node);
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ut_ad(que_node_get_type(node) == QUE_NODE_WHILE);
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ut_ad((thr->prev_node == que_node_get_parent(node))
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|| (que_node_get_next(thr->prev_node) == NULL));
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/* Evaluate the condition */
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eval_exp(node->cond);
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if (eval_node_get_ibool_val(node->cond)) {
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/* The condition evaluated to TRUE: start execution
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from the first statement in the statement list */
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thr->run_node = node->stat_list;
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} else {
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thr->run_node = que_node_get_parent(node);
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}
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return(thr);
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}
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/**********************************************************************//**
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Performs an execution step of an assignment statement node.
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@return query thread to run next or NULL */
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que_thr_t*
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assign_step(
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/*========*/
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que_thr_t* thr) /*!< in: query thread */
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{
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assign_node_t* node;
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ut_ad(thr);
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node = static_cast<assign_node_t*>(thr->run_node);
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ut_ad(que_node_get_type(node) == QUE_NODE_ASSIGNMENT);
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/* Evaluate the value to assign */
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eval_exp(node->val);
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eval_node_copy_val(node->var->alias, node->val);
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thr->run_node = que_node_get_parent(node);
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return(thr);
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}
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/**********************************************************************//**
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Performs an execution step of a for-loop node.
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@return query thread to run next or NULL */
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que_thr_t*
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for_step(
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/*=====*/
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que_thr_t* thr) /*!< in: query thread */
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{
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for_node_t* node;
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que_node_t* parent;
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lint loop_var_value;
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ut_ad(thr);
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node = static_cast<for_node_t*>(thr->run_node);
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ut_ad(que_node_get_type(node) == QUE_NODE_FOR);
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parent = que_node_get_parent(node);
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if (thr->prev_node != parent) {
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/* Move to the next statement */
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thr->run_node = que_node_get_next(thr->prev_node);
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if (thr->run_node != NULL) {
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return(thr);
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}
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/* Increment the value of loop_var */
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loop_var_value = 1 + eval_node_get_int_val(node->loop_var);
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} else {
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/* Initialize the loop */
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eval_exp(node->loop_start_limit);
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eval_exp(node->loop_end_limit);
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loop_var_value = eval_node_get_int_val(node->loop_start_limit);
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node->loop_end_value
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= (int) eval_node_get_int_val(node->loop_end_limit);
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}
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/* Check if we should do another loop */
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if (loop_var_value > node->loop_end_value) {
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/* Enough loops done */
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thr->run_node = parent;
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} else {
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eval_node_set_int_val(node->loop_var, loop_var_value);
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thr->run_node = node->stat_list;
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}
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return(thr);
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}
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/**********************************************************************//**
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Performs an execution step of an exit statement node.
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@return query thread to run next or NULL */
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que_thr_t*
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exit_step(
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/*======*/
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que_thr_t* thr) /*!< in: query thread */
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{
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exit_node_t* node;
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que_node_t* loop_node;
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ut_ad(thr);
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node = static_cast<exit_node_t*>(thr->run_node);
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ut_ad(que_node_get_type(node) == QUE_NODE_EXIT);
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/* Loops exit by setting thr->run_node as the loop node's parent, so
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find our containing loop node and get its parent. */
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loop_node = que_node_get_containing_loop_node(node);
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/* If someone uses an EXIT statement outside of a loop, this will
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trigger. */
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ut_a(loop_node);
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thr->run_node = que_node_get_parent(loop_node);
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return(thr);
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}
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/**********************************************************************//**
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Performs an execution step of a return-statement node.
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@return query thread to run next or NULL */
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que_thr_t*
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return_step(
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/*========*/
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que_thr_t* thr) /*!< in: query thread */
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{
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return_node_t* node;
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que_node_t* parent;
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ut_ad(thr);
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node = static_cast<return_node_t*>(thr->run_node);
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ut_ad(que_node_get_type(node) == QUE_NODE_RETURN);
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parent = node;
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while (que_node_get_type(parent) != QUE_NODE_PROC) {
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parent = que_node_get_parent(parent);
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}
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ut_a(parent);
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thr->run_node = que_node_get_parent(parent);
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return(thr);
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}
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