/*
* (c) 2007 Mario de Sousa and Laurent Bessard
*
* 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)
*
*/
/*
* This is one of the versions available for the 4th stage.
*
* This 4th stage generates a c++ source program equivalent
* to the IL and ST code.
*/
//#include <stdio.h> /* required for NULL */
//#include <string>
//#include <iostream>
//#include "../../util/symtable.hh"
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
class generate_location_list_c: protected iterator_visitor_c {
protected:
stage4out_c &s4o;
private:
symbol_c *current_var_type_symbol;
generate_c_base_c *generate_c_base;
search_base_type_c search_base_type;
public:
generate_location_list_c(stage4out_c *s4o_ptr): s4o(*s4o_ptr) {
generate_c_base = new generate_c_base_c(s4o_ptr);
current_var_type_symbol = NULL;
}
~generate_location_list_c(void) {
delete generate_c_base;
}
bool test_location_type(symbol_c *direct_variable) {
token_c *location = dynamic_cast<token_c *>(direct_variable);
if (location == NULL)
/* invalid identifiers... */
return false;
switch (location->value[2]) {
case 'X': // bit
if (typeid(*current_var_type_symbol) == typeid(bool_type_name_c)) return true;
break;
case 'B': // Byte, 8 bits
if (typeid(*current_var_type_symbol) == typeid(sint_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(usint_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(string_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(byte_type_name_c)) return true;
break;
case 'W': // Word, 16 bits
if (typeid(*current_var_type_symbol) == typeid(int_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(uint_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(word_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(wstring_type_name_c)) return true;
break;
case 'D': // Double, 32 bits
if (typeid(*current_var_type_symbol) == typeid(dint_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(udint_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(real_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(dword_type_name_c)) return true;
break;
case 'L': // Long, 64 bits
if (typeid(*current_var_type_symbol) == typeid(lint_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(ulint_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(lreal_type_name_c)) return true;
if (typeid(*current_var_type_symbol) == typeid(lword_type_name_c)) return true;
break;
default:
if (typeid(*current_var_type_symbol) == typeid(bool_type_name_c)) return true;
}
return false;
}
/********************************************/
/* B.1.4.1 Directly Represented Variables */
/********************************************/
void *visit(direct_variable_c *symbol) {
if (current_var_type_symbol) {
s4o.print("__LOCATED_VAR(");
current_var_type_symbol->accept(*generate_c_base);
s4o.print(",");
/* Do not use print_token() as it will change everything into uppercase */
s4o.printlocation((symbol->value)+1);
s4o.print(",");
s4o.printlocation_comasep((symbol->value)+1);
s4o.print(")\n");
}
return NULL;
}
/********************************************/
/* B.1.4.3 Declaration and initilization */
/********************************************/
/* [variable_name] location ':' located_var_spec_init */
/* variable_name -> may be NULL ! */
//SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
void *visit(located_var_decl_c *symbol) {
current_var_type_symbol = spec_init_sperator_c::get_spec(symbol->located_var_spec_init);
if (current_var_type_symbol == NULL)
ERROR;
current_var_type_symbol = (symbol_c *)(current_var_type_symbol->accept(search_base_type));
if (current_var_type_symbol == NULL)
ERROR;
symbol->location->accept(*this);
current_var_type_symbol = NULL;
return NULL;
}
/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
/* type_specification ->may be NULL ! */
//SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
void *visit(global_var_decl_c *symbol) {
current_var_type_symbol = spec_init_sperator_c::get_spec(symbol->type_specification);
if (current_var_type_symbol == NULL)
ERROR;
current_var_type_symbol = (symbol_c *)(current_var_type_symbol->accept(search_base_type));
if (current_var_type_symbol == NULL)
ERROR;
symbol->global_var_spec->accept(*this);
current_var_type_symbol = NULL;
return NULL;
}
/* AT direct_variable */
//SYM_REF2(location_c, direct_variable, unused)
void *visit(location_c *symbol) {
if (test_location_type(symbol->direct_variable))
symbol->direct_variable->accept(*this);
else
ERROR;
return NULL;
}
}; /* generate_location_list_c */