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Diffstat (limited to 'storage/innobase/eval/eval0proc.cc')
-rw-r--r-- | storage/innobase/eval/eval0proc.cc | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/storage/innobase/eval/eval0proc.cc b/storage/innobase/eval/eval0proc.cc new file mode 100644 index 00000000000..e6f3a32cd48 --- /dev/null +++ b/storage/innobase/eval/eval0proc.cc @@ -0,0 +1,296 @@ +/***************************************************************************** + +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); +} |