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/*
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* (c) 2007 Mario de Sousa and Laurent Bessard
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*
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* Offered to the public under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* This code is made available on the understanding that it will not be
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* used in safety-critical situations without a full and competent review.
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*/
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/*
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* An IEC 61131-3 IL and ST compiler.
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*
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* Based on the
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* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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*
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*/
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/*
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* This is one of the versions available for the 4th stage.
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*
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* This 4th stage generates a c++ source program equivalent
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* to the IL and ST code.
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*/
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//#include <stdio.h> /* required for NULL */
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//#include <string>
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//#include <iostream>
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//#include "../../util/symtable.hh"
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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class generate_location_list_c: protected iterator_visitor_c {
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protected:
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stage4out_c &s4o;
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private:
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symbol_c *current_var_type_symbol;
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generate_c_base_c *generate_c_base;
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search_base_type_c search_base_type;
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public:
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generate_location_list_c(stage4out_c *s4o_ptr): s4o(*s4o_ptr) {
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generate_c_base = new generate_c_base_c(s4o_ptr);
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current_var_type_symbol = NULL;
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}
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~generate_location_list_c(void) {
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delete generate_c_base;
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}
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bool test_location_type(symbol_c *direct_variable) {
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token_c *location = dynamic_cast<token_c *>(direct_variable);
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if (location == NULL)
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/* invalid identifiers... */
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return false;
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switch (location->value[2]) {
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case 'X': // bit
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if (typeid(*current_var_type_symbol) == typeid(bool_type_name_c)) return true;
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break;
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case 'B': // Byte, 8 bits
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if (typeid(*current_var_type_symbol) == typeid(sint_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(usint_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(string_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(byte_type_name_c)) return true;
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break;
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case 'W': // Word, 16 bits
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if (typeid(*current_var_type_symbol) == typeid(int_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(uint_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(word_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(wstring_type_name_c)) return true;
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break;
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case 'D': // Double, 32 bits
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if (typeid(*current_var_type_symbol) == typeid(dint_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(udint_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(real_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(dword_type_name_c)) return true;
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break;
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case 'L': // Long, 64 bits
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if (typeid(*current_var_type_symbol) == typeid(lint_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(ulint_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(lreal_type_name_c)) return true;
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if (typeid(*current_var_type_symbol) == typeid(lword_type_name_c)) return true;
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break;
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default:
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if (typeid(*current_var_type_symbol) == typeid(bool_type_name_c)) return true;
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}
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return false;
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}
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/********************************************/
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/* B.1.4.1 Directly Represented Variables */
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/********************************************/
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void *visit(direct_variable_c *symbol) {
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if (current_var_type_symbol) {
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s4o.print("__LOCATED_VAR(");
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current_var_type_symbol->accept(*generate_c_base);
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s4o.print(",");
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/* Do not use print_token() as it will change everything into uppercase */
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s4o.printlocation((symbol->value)+1);
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s4o.print(",");
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s4o.printlocation_comasep((symbol->value)+1);
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s4o.print(")\n");
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}
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return NULL;
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}
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/********************************************/
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/* B.1.4.3 Declaration and initilization */
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/********************************************/
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/* [variable_name] location ':' located_var_spec_init */
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/* variable_name -> may be NULL ! */
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//SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
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void *visit(located_var_decl_c *symbol) {
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current_var_type_symbol = spec_init_sperator_c::get_spec(symbol->located_var_spec_init);
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if (current_var_type_symbol == NULL)
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ERROR;
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current_var_type_symbol = (symbol_c *)(current_var_type_symbol->accept(search_base_type));
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if (current_var_type_symbol == NULL)
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ERROR;
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symbol->location->accept(*this);
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current_var_type_symbol = NULL;
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return NULL;
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}
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/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
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/* type_specification ->may be NULL ! */
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//SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
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void *visit(global_var_decl_c *symbol) {
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current_var_type_symbol = spec_init_sperator_c::get_spec(symbol->type_specification);
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if (current_var_type_symbol == NULL)
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ERROR;
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current_var_type_symbol = (symbol_c *)(current_var_type_symbol->accept(search_base_type));
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if (current_var_type_symbol == NULL)
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ERROR;
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symbol->global_var_spec->accept(*this);
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current_var_type_symbol = NULL;
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return NULL;
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}
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/* AT direct_variable */
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//SYM_REF2(location_c, direct_variable, unused)
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void *visit(location_c *symbol) {
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if (test_location_type(symbol->direct_variable))
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symbol->direct_variable->accept(*this);
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else
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ERROR;
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return NULL;
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}
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}; /* generate_location_list_c */
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