Adding support for forcing tick count to return to zero as the same time than all tasks firing are synchronized
/*
* (c) 2003 Mario de Sousa
*
* Offered to the public under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* 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.
*
* This code is made available on the understanding that it will not be
* used in safety-critical situations without a full and competent review.
*/
/*
* An IEC 61131-3 IL and ST compiler.
*
* Based on the
* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
*
*/
/*
* A generic symbol table.
*
* This is used to create symbol tables such as a list of
* variables currently in scope, etc...
* Note that the list of previously defined funstions uses the
* dsymtable_c instead, as it requires the table to store duplicate values.
*/
#include <iostream>
#include "symtable.hh"
/* A macro for printing out internal parser errors... */
#define ERROR error_exit(__FILE__,__LINE__)
/* function defined in main.cc */
extern void error_exit(const char *file_name, int line_no);
template<typename value_type, value_type null_value>
symtable_c<value_type, null_value>::symtable_c(void) {inner_scope = NULL;}
/* clear all entries... */
template<typename value_type, value_type null_value>
void symtable_c<value_type, null_value>::reset(void) {
_base.clear();
}
/* create new inner scope */
template<typename value_type, value_type null_value>
void symtable_c<value_type, null_value>::push(void) {
if (inner_scope != NULL) {
inner_scope->push();
} else {
inner_scope = new symtable_c();
}
}
/* clear most inner scope */
/* returns 1 if this is the inner most scope */
/* 0 otherwise */
template<typename value_type, value_type null_value>
int symtable_c<value_type, null_value>::pop(void) {
if (inner_scope != NULL) {
if (inner_scope->pop() == 1) {
delete inner_scope;
inner_scope = NULL;
}
return 0;
} else {
_base.clear();
return 1;
}
}
template<typename value_type, value_type null_value>
void symtable_c<value_type, null_value>::set(const symbol_c *symbol, value_t new_value) {
if (inner_scope != NULL) {
inner_scope->set(symbol, new_value);
return;
}
const token_c *name = dynamic_cast<const token_c *>(symbol);
if (name == NULL)
ERROR;
set(name->value, new_value);
}
template<typename value_type, value_type null_value>
void symtable_c<value_type, null_value>::set(const char *identifier_str, value_t new_value) {
if (inner_scope != NULL) {
inner_scope->set(identifier_str, new_value);
return;
}
// std::cout << "set_identifier(" << identifier_str << "): \n";
iterator i = _base.find(identifier_str);
if (i == _base.end())
/* identifier not already in map! */
ERROR;
_base[identifier_str] = new_value;
}
template<typename value_type, value_type null_value>
void symtable_c<value_type, null_value>::insert(const char *identifier_str, value_t new_value) {
if (inner_scope != NULL) {
inner_scope->insert(identifier_str, new_value);
return;
}
// std::cout << "store_identifier(" << identifier_str << "): \n";
std::pair<const char *, value_t> new_element(identifier_str, new_value);
std::pair<iterator, bool> res = _base.insert(new_element);
if (!res.second)
/* error inserting new identifier... */
/* identifier already in map? */
ERROR;
}
template<typename value_type, value_type null_value>
void symtable_c<value_type, null_value>::insert(const symbol_c *symbol, value_t new_value) {
/*
// not required...
if (inner_scope != NULL) {
inner_scope->insert(symbol, new_value);
return;
}
*/
const token_c *name = dynamic_cast<const token_c *>(symbol);
if (name == NULL)
ERROR;
insert(name->value, new_value);
}
/* returns null_value if not found! */
template<typename value_type, value_type null_value>
value_type symtable_c<value_type, null_value>::find_value(const char *identifier_str) {
if (inner_scope != NULL) {
value_t token = inner_scope->find_value(identifier_str);
if (token != null_value)
/* found in the lower level */
return token;
}
/* if no lower level, or not found in lower level... */
iterator i = _base.find(identifier_str);
if (i == _base.end())
return null_value;
else
return i->second;
}
template<typename value_type, value_type null_value>
value_type symtable_c<value_type, null_value>::find_value(const symbol_c *symbol) {
const token_c *name = dynamic_cast<const token_c *>(symbol);
if (name == NULL)
ERROR;
return find_value(name->value);
}
/* debuging function... */
template<typename value_type, value_type null_value>
void symtable_c<value_type, null_value>::print(void) {
for(iterator i = _base.begin();
i != _base.end();
i++)
std::cout << i->second << ":" << i->first << "\n";
std::cout << "=====================\n";
if (inner_scope != NULL) {
inner_scope->print();
}
}