absyntax_utils/add_en_eno_param_decl.cc
author Conti Manuele <manuele.conti@alice.it>
Wed, 02 May 2012 14:46:48 +0200
changeset 538 06cc7500500d
parent 350 2c3c4dc34979
child 596 4efb11e44065
permissions -rwxr-xr-x
Fix __dt_to_string primitive function.
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2009-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 3 of the License, or
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 *  (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,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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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 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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 * Iterate through all declared functions and Function Blocks, 
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 * and, for each function/FB, add a declaration of the EN and ENO 
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 * parameters, if they have not already been explicitly declared.
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 *
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 * EN and ENO parameters declared explicitly (by the user in the source code)
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 * and implicitly (by the comnpiler, i.e. by this visitor class) may be
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 * distinguished later on by the 'method' flag in the en_param_declaration_c
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 * and eno_param_declaration_c objects.
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 */
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#include "add_en_eno_param_decl.hh"
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#include <strings.h>
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// #define DEBUG
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#ifdef DEBUG
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#define TRACE(classname) printf("\n____%s____\n",classname);
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#else
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#define TRACE(classname)
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#endif
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#define ERROR error_exit(__FILE__,__LINE__)
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/* function defined in main.cc */
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extern void error_exit(const char *file_name, int line_no);
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/* This class is a singleton.
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 * So we need a pointer to the singe instance...
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 */
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add_en_eno_param_decl_c *add_en_eno_param_decl_c::singleton = NULL;
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/* Constructor for the singleton class */
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symbol_c *add_en_eno_param_decl_c::add_to(symbol_c *tree_root) {
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      if (NULL == singleton) {
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        singleton = new add_en_eno_param_decl_c;
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        if (NULL == singleton)
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          return NULL;
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      }
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      tree_root->accept(*singleton);
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      return tree_root;
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    }
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/* Destructor for the singleton class */
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add_en_eno_param_decl_c::~add_en_eno_param_decl_c(void) {
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      if (NULL != singleton) delete singleton;
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      singleton = NULL;
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    }
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void* add_en_eno_param_decl_c::iterate_list(list_c *list) {
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  for (int i = 0; i < list->n; i++) {
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    list->elements[i]->accept(*this);
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  }
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  return NULL;
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}
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input_declarations_c *add_en_eno_param_decl_c::build_en_param(void) {
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  boolean_literal_c *boolean_literal = 
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    new boolean_literal_c(new bool_type_name_c(), new boolean_true_c());
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  identifier_c *identifier =
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    new identifier_c("EN");
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  en_param_declaration_c *en_param_declaration = 
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    new en_param_declaration_c(identifier, new bool_type_name_c(), boolean_literal, new implicit_definition_c());
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    /* the last paramater is to flag that this
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     * declaration was inserted automatically, i.e. an implicit declaration 
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     */
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  input_declaration_list_c *input_declaration_list = new input_declaration_list_c();
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  input_declaration_list->add_element(en_param_declaration);
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  input_declarations_c *input_declarations = new input_declarations_c(NULL, input_declaration_list, new implicit_definition_c());
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  return input_declarations;
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}
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output_declarations_c *add_en_eno_param_decl_c::build_eno_param(void) {
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  identifier_c *identifier =
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    new identifier_c("ENO");
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  eno_param_declaration_c *eno_param_declaration =
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    new eno_param_declaration_c(identifier, new bool_type_name_c(), new implicit_definition_c()); 
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    /* the last paramater is to flag that this
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     * declaration was inserted automatically, i.e. an implicit declaration 
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     */
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  var_init_decl_list_c *var_init_decl_list = new var_init_decl_list_c();
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  var_init_decl_list->add_element(eno_param_declaration);
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  output_declarations_c *output_declarations = new output_declarations_c(NULL, var_init_decl_list, new implicit_definition_c());
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  return output_declarations;
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}
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/***************************/
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/* B 0 - Programming Model */
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/***************************/
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void *add_en_eno_param_decl_c::visit(library_c *symbol) {
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  TRACE("library_c"); 
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  return iterate_list(symbol);
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}
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/***********************/
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/* B 1.5.1 - Functions */
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/***********************/
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void *add_en_eno_param_decl_c::visit(function_declaration_c *symbol) {
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  TRACE("function_declaration_c"); 
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  return symbol->var_declarations_list->accept(*this);
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}
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void *add_en_eno_param_decl_c::visit(var_declarations_list_c *symbol) {
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    TRACE("var_declarations_list_c");
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    en_declared  = false; 
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    eno_declared = false; 
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    iterate_list(symbol);
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    /* insert elements to begining of list! */
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    /* We want EN first, and then ENO.
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     * But, since we are insertin them into the head of the list, we must insert EN last so it will stay in the first position!
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     */
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    if(eno_declared == false) symbol->insert_element(build_eno_param());
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    if(en_declared  == false) symbol->insert_element(build_en_param());
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    /* append elements to end of list! */
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    /*
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    if(en_declared  == false) symbol->add_element(build_en_param());
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    if(eno_declared == false) symbol->add_element(build_eno_param());
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    */
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    return NULL;
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}
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/****************************************/
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/* 1.4.3 - Declaration & Initialisation */
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/****************************************/
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void *add_en_eno_param_decl_c::visit(input_declarations_c *symbol) {
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  TRACE("input_declarations_c");
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//   current_param_direction = direction_in;
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  return symbol->input_declaration_list->accept(*this);
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}
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void *add_en_eno_param_decl_c::visit(input_declaration_list_c *symbol) {TRACE("input_declaration_list_c"); return iterate_list(symbol);}
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void *add_en_eno_param_decl_c::visit(en_param_declaration_c *symbol) {
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  TRACE("en_param_declaration_c");
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  en_declared = true;
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  return NULL;
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}
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void *add_en_eno_param_decl_c::visit(eno_param_declaration_c *symbol) {
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  TRACE("eno_param_declaration_c");
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  eno_declared = true;
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  return NULL;
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}
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void *add_en_eno_param_decl_c::visit(output_declarations_c *symbol) {
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  TRACE("output_declarations_c");
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//   current_param_direction = direction_out;
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  return symbol->var_init_decl_list->accept(*this);
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}
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void *add_en_eno_param_decl_c::visit(var_init_decl_list_c *symbol) 
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{TRACE("var_init_decl_list_c"); return iterate_list(symbol);}
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/*****************************/
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/* B 1.5.2 - Function Blocks */
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/*****************************/
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/*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
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void *add_en_eno_param_decl_c::visit(function_block_declaration_c *symbol) {
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  TRACE("function_block_declaration_c"); 
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  return symbol->var_declarations->accept(*this);
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}
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