absyntax_utils/function_call_param_iterator.cc
author Edouard Tisserant <edouard.tisserant@gmail.com>
Thu, 20 Jul 2023 22:03:23 +0200
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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) 2003-2011  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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 * Function call parameter iterator.
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 * It will iterate through the non-formal parameters of a function call
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 * (i.e. function calls using the foo(<param1>, <param2>, ...) syntax).
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 * and/or search through the formal parameters of a function call
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 * (i.e. function calls using the foo(<name1> = <param1>, <name2> = <param2>, ...) syntax).
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 *
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 * Calls to function blocks and programs are also supported.
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 *
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 * Note that calls to next_nf() will only iterate through non-formal parameters,
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 * calls to next_f() will only iterate through formal parameters,
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 * and calls to search_f() will only serach through formal parameters.
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 */
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#include "function_call_param_iterator.hh"
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#include <strings.h>
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#include "../main.hh" // required for ERROR() and ERROR_MSG() macros.
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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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void *function_call_param_iterator_c::search_list(list_c *list) {
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  switch (current_operation) {
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    case iterate_nf_op:
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      for(int i = 0; i < list->n; i++) {
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        void *res = list->get_element(i)->accept(*this);
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        if (NULL != res) {
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          /* It went through the handle_parameter_assignment() function,
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           * and is therefore a parameter assignment (<param> = <value>),
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           * and not a simple expression (<value>).
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           */
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          /* we do nothing... */
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        } else {
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          param_count++;
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          if (param_count == iterate_nf_next_param) {
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            return list->get_element(i);
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          }
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        }
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      }
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      return NULL;
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      break;
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    case iterate_f_op:
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      for(int i = 0; i < list->n; i++) {
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        void *res = list->get_element(i)->accept(*this);
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        if (NULL != res) {
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          /* It went through the handle_parameter_assignment() function,
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           * and is therefore a parameter assignment (<param> = <value>),
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           * and not a simple expression (<value>).
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           */
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          param_count++;
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          if (param_count == iterate_f_next_param) {
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            return res;
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          }
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        } else {
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          /* we do nothing... */
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        }
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      }
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      return NULL;
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      break;
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    case search_f_op:
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      for(int i = 0; i < list->n; i++) {
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        void *res = list->get_element(i)->accept(*this);
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        if (res != NULL)
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          return res;
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      }
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      return NULL;
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      break;
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  } /* switch */
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  return NULL;
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}
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void *function_call_param_iterator_c::handle_parameter_assignment(symbol_c *variable_name, symbol_c *expression) {
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  switch (current_operation) {
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    case iterate_nf_op:
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          /* UGLY HACK -> this will be detected in the search_list() function */
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      return (void *)variable_name; /* anything, as long as it is not NULL!! */
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      break;
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    case iterate_f_op:
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      current_value = expression;
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      return (void *)variable_name;
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      break;
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    case search_f_op:
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      identifier_c *variable_name2 = dynamic_cast<identifier_c *>(variable_name);
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      if (variable_name2 == NULL) ERROR;
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      if (strcasecmp(search_param_name->value, variable_name2->value) == 0)
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        /* FOUND! This is the same parameter!! */
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        return (void *)expression;
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      return NULL;
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      break;
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  }
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  ERROR;
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  return NULL;
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}
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/* start off at the first parameter once again... */
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void function_call_param_iterator_c::reset(void) {
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  iterate_nf_next_param = 0;
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  iterate_f_next_param  = 0;
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  param_count = 0;
181
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}
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/* initialise the iterator object.
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 * We must be given a reference to the function/program/function block call
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 * that will be analysed...
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 */
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function_call_param_iterator_c::function_call_param_iterator_c(symbol_c *f_call) {
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  /* It is expected that f_call will reference one of the following:
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   *  program_configuration_c
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   *  function_invocation_c
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   *  fb_invocation_c
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   *  il_function_call_c
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   *  il_formal_funct_call_c
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   *  ... (have I missed any?)
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   */
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  this->f_call = f_call;
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  search_param_name = NULL;
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  reset();
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}
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/* Skip to the next formal parameter. After object creation,
181
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 * the object references on parameter _before_ the first, so
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 * this function must be called once to get the object to
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 * reference the first parameter...
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 *
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 * Returns the paramater name to which a value is being passed!
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 * You can determine the value being passed by calling 
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 * function_call_param_iterator_c::search_f()
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 */
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symbol_c *function_call_param_iterator_c::next_f(void) {
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  current_value = NULL;
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  current_assign_direction = assign_none;
181
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  param_count = 0;
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  iterate_f_next_param++;
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  current_operation = function_call_param_iterator_c::iterate_f_op;
181
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  void *res = f_call->accept(*this);
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  return (symbol_c *)res;
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}
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202
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/* Skip to the next non-formal parameter. After object creation,
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 * the object references on parameter _before_ the first, so
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 * this function must be called once to get the object to
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 * reference the first parameter...
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 *
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 * Returns whatever is being passed to the parameter!
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 */
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symbol_c *function_call_param_iterator_c::next_nf(void) {
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  current_value = NULL;
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  current_assign_direction = assign_none;
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  param_count = 0;
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  iterate_nf_next_param++;
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  current_operation = function_call_param_iterator_c::iterate_nf_op;
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  void *res = f_call->accept(*this);
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  current_value = (symbol_c *)res;
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  return (symbol_c *)res;
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}
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181
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/* Search for the value passed to the parameter named <param_name>...  */
202
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symbol_c *function_call_param_iterator_c::search_f(symbol_c *param_name) {
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  current_value = NULL;
449
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  current_assign_direction = assign_none;
181
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  if (NULL == param_name) ERROR;
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  search_param_name = dynamic_cast<identifier_c *>(param_name);
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  if (NULL == search_param_name) ERROR;
202
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  current_operation = function_call_param_iterator_c::search_f_op;
181
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  void *res = f_call->accept(*this);
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  current_value = (symbol_c *)res;
181
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  return (symbol_c *)res;
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}
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350
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/* Search for the value passed to the parameter named <param_name>...  */
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symbol_c *function_call_param_iterator_c::search_f(const char *param_name) {
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  identifier_c tmp_indentifier(param_name);
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  return search_f(&tmp_indentifier);
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}
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202
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/* Returns the value being passed to the current parameter. */
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symbol_c *function_call_param_iterator_c::get_current_value(void) {
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  return current_value;
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}
181
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449
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/* Returns the value being passed to the current parameter. */
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function_call_param_iterator_c::assign_direction_t function_call_param_iterator_c::get_assign_direction(void) {
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  return current_assign_direction;
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}
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181
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/********************************/
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/* B 1.7 Configuration elements */
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/********************************/
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/*
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CONFIGURATION configuration_name
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   optional_global_var_declarations
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   (resource_declaration_list | single_resource_declaration)
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   optional_access_declarations
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   optional_instance_specific_initializations
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END_CONFIGURATION
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*/
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/*
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SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)
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*/
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/* helper symbol for configuration_declaration */
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/*
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SYM_LIST(resource_declaration_list_c)
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*/
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/*
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RESOURCE resource_name ON resource_type_name
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   optional_global_var_declarations
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   single_resource_declaration
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END_RESOURCE
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*/
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/*
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SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)
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*/
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/* task_configuration_list program_configuration_list */
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/*
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SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
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*/
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/* helper symbol for single_resource_declaration */
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/*
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SYM_LIST(task_configuration_list_c)
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*/
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/* helper symbol for single_resource_declaration */
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   285
/*
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SYM_LIST(program_configuration_list_c)
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*/
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/* helper symbol for
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 *  - access_path
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 *  - instance_specific_init
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 */
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/*
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SYM_LIST(any_fb_name_list_c)
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*/
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   296
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/*  [resource_name '.'] global_var_name ['.' structure_element_name] */
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/*
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SYM_REF4(global_var_reference_c, resource_name, global_var_name, structure_element_name, unused)
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*/
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   301
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/*  prev_declared_program_name '.' symbolic_variable */
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   303
/*
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SYM_REF2(program_output_reference_c, program_name, symbolic_variable)
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*/
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   306
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/*  TASK task_name task_initialization */
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/*
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SYM_REF2(task_configuration_c, task_name, task_initialization)
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   310
*/
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   311
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/*  '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */
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/*
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SYM_REF4(task_initialization_c, single_data_source, interval_data_source, priority_data_source, unused)
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*/
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   316
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/*  PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */
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// SYM_REF6(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements, unused)
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void *function_call_param_iterator_c::visit(program_configuration_c *symbol) {
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  TRACE("program_configuration_c");
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   321
  return symbol->prog_conf_elements->accept(*this);
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}
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   323
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   324
/* prog_conf_elements ',' prog_conf_element */
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// SYM_LIST(prog_conf_elements_c)
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void *function_call_param_iterator_c::visit(prog_conf_elements_c *symbol) {
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  TRACE("prog_conf_elements_c");
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   328
  return search_list(symbol);
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   329
}
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   330
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   331
/*  fb_name WITH task_name */
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   332
/*
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   333
SYM_REF2(fb_task_c, fb_name, task_name)
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   334
*/
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   335
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   336
/*  any_symbolic_variable ASSIGN prog_data_source */
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   337
// SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source)
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void *function_call_param_iterator_c::visit(prog_cnxn_assign_c *symbol) {
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  TRACE("prog_cnxn_assign_c");
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   340
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   341
  /* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario)
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   342
   *       do not understand the semantics that should be implmeneted if it is not a
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   343
   *        symbolic_variable, so for the moment we simply give up!
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   */
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  symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable);
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   346
  if (NULL == symb_var)
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   347
    ERROR;
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449
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parents: 350
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   349
  current_assign_direction = assign_in;
181
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  return handle_parameter_assignment(symb_var->var_name, symbol->prog_data_source);
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}
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   352
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   353
/* any_symbolic_variable SENDTO data_sink */
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   354
// SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, prog_data_source)
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   355
void *function_call_param_iterator_c::visit(prog_cnxn_sendto_c *symbol) {
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   356
  TRACE("prog_cnxn_sendto_c");
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   357
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   358
  /* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario)
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   359
   *       do not understand the semantics that should be implmeneted if it is not a
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   360
   *        symbolic_variable, so for the moment we simply give up!
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   361
   */
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   362
  symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable);
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   363
  if (NULL == symb_var)
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   364
    ERROR;
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   365
449
3c6225521059 Semantic verification: Add compatibility check for parameter direction in function invocation.
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parents: 350
diff changeset
   366
  current_assign_direction = assign_out;
181
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   367
  return handle_parameter_assignment(symb_var->var_name, symbol->data_sink);
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   368
}
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   369
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   370
/* VAR_CONFIG instance_specific_init_list END_VAR */
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   371
/*
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   372
SYM_REF2(instance_specific_initializations_c, instance_specific_init_list, unused)
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   373
*/
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   374
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   375
/* helper symbol for instance_specific_initializations */
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   376
/*
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   377
SYM_LIST(instance_specific_init_list_c)
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   378
*/
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diff changeset
   379
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   380
/* resource_name '.' program_name '.' {fb_name '.'}
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   381
    ((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization))
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   382
*/
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diff changeset
   383
/*
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   384
SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization)
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   385
*/
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diff changeset
   386
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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   387
/* helper symbol for instance_specific_init */
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diff changeset
   388
/* function_block_type_name ':=' structure_initialization */
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   389
/*
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   390
SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization)
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   391
*/
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parents:
diff changeset
   392
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   393
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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diff changeset
   394
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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diff changeset
   395
/****************************************/
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   396
/* B.2 - Language IL (Instruction List) */
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   397
/****************************************/
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   398
/***********************************/
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diff changeset
   399
/* B 2.1 Instructions and Operands */
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   400
/***********************************/
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diff changeset
   401
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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   402
/* | function_name [il_operand_list] */
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   403
// SYM_REF2(il_function_call_c, function_name, il_operand_list)
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   404
void *function_call_param_iterator_c::visit(il_function_call_c *symbol) {
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   405
  TRACE("il_function_call_c");
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   406
  if (NULL != symbol->il_operand_list)
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   407
    return symbol->il_operand_list->accept(*this);
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diff changeset
   408
  return NULL;
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diff changeset
   409
}
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parents:
diff changeset
   410
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parents:
diff changeset
   411
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diff changeset
   412
/* | function_name '(' eol_list [il_param_list] ')' */
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   413
// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
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   414
void *function_call_param_iterator_c::visit(il_formal_funct_call_c *symbol) {
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   415
  TRACE("il_formal_funct_call_c");
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   416
  if (NULL != symbol->il_param_list)
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diff changeset
   417
    return symbol->il_param_list->accept(*this);
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diff changeset
   418
  return NULL;
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diff changeset
   419
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   420
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parents:
diff changeset
   421
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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diff changeset
   422
/*   il_call_operator prev_declared_fb_name
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   423
 * | il_call_operator prev_declared_fb_name '(' ')'
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   424
 * | il_call_operator prev_declared_fb_name '(' eol_list ')'
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   425
 * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
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   426
 * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
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diff changeset
   427
 */
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   428
// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)
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   429
void *function_call_param_iterator_c::visit(il_fb_call_c *symbol) {
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diff changeset
   430
  TRACE("il_fb_call_c");
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parents:
diff changeset
   431
  /* the following should never occur. In reality the syntax parser
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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   432
   * will guarantee that they never occur, but it makes it easier to
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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diff changeset
   433
   * understand the remaining code :-)
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diff changeset
   434
   */
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diff changeset
   435
  //if ((NULL == symbol->il_operand_list) && (NULL == symbol->il_param_list)) ERROR;
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diff changeset
   436
  //if ((NULL != symbol->il_operand_list) && (NULL != symbol->il_param_list)) ERROR;
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   437
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
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parents:
diff changeset
   438
  if (NULL != symbol->il_operand_list)
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parents:
diff changeset
   439
    return symbol->il_operand_list->accept(*this);
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   440
  if (NULL != symbol->il_param_list)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   441
    return symbol->il_param_list->accept(*this);
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   442
  return NULL;
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   443
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   444
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   445
/* | il_operand_list ',' il_operand */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   446
// SYM_LIST(il_operand_list_c)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   447
void *function_call_param_iterator_c::visit(il_operand_list_c *symbol) {
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   448
  TRACE("il_operand_list_c");
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   449
  return search_list(symbol);
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   450
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   451
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   452
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   453
/* | il_initial_param_list il_param_instruction */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   454
// SYM_LIST(il_param_list_c)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   455
void *function_call_param_iterator_c::visit(il_param_list_c *symbol) {
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   456
  TRACE("il_param_list_c");
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   457
  return search_list(symbol);
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   458
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   459
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   460
/*  il_assign_operator il_operand
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   461
 * | il_assign_operator '(' eol_list simple_instr_list ')'
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   462
 */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   463
// SYM_REF4(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list, unused)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   464
void *function_call_param_iterator_c::visit(il_param_assignment_c *symbol) {
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   465
  TRACE("il_param_assignment_c");
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   466
844
39c755f41ee8 Generate correct error message when encountering IL lists embedded in IL formal invocations.
mjsousa
parents: 596
diff changeset
   467
  symbol_c *expression = NULL;
39c755f41ee8 Generate correct error message when encountering IL lists embedded in IL formal invocations.
mjsousa
parents: 596
diff changeset
   468
  if (!((NULL != symbol->simple_instr_list) ^ (NULL != symbol->il_operand))) ERROR;
39c755f41ee8 Generate correct error message when encountering IL lists embedded in IL formal invocations.
mjsousa
parents: 596
diff changeset
   469
  if    (NULL != symbol->simple_instr_list) expression = symbol->simple_instr_list;
39c755f41ee8 Generate correct error message when encountering IL lists embedded in IL formal invocations.
mjsousa
parents: 596
diff changeset
   470
  if    (NULL != symbol->il_operand       ) expression = symbol->il_operand;
181
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   471
449
3c6225521059 Semantic verification: Add compatibility check for parameter direction in function invocation.
Mario de Sousa <msousa@fe.up.pt>
parents: 350
diff changeset
   472
  current_assign_direction = assign_in;
844
39c755f41ee8 Generate correct error message when encountering IL lists embedded in IL formal invocations.
mjsousa
parents: 596
diff changeset
   473
  return handle_parameter_assignment((symbol_c *)symbol->il_assign_operator->accept(*this), expression);
181
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   474
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   475
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   476
/*  il_assign_out_operator variable */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   477
// SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable);
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   478
void *function_call_param_iterator_c::visit(il_param_out_assignment_c *symbol) {
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   479
  TRACE("il_param_out_assignment_c");
449
3c6225521059 Semantic verification: Add compatibility check for parameter direction in function invocation.
Mario de Sousa <msousa@fe.up.pt>
parents: 350
diff changeset
   480
  current_assign_direction = assign_out;
181
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   481
  return handle_parameter_assignment((symbol_c *)symbol->il_assign_out_operator->accept(*this), symbol->variable);
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   482
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   483
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   484
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   485
/*******************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   486
/* B 2.2 Operators */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   487
/*******************/
202
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   488
/*  any_identifier ASSIGN */
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   489
// SYM_REF1(il_assign_operator_c, variable_name)
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   490
void *function_call_param_iterator_c::visit(il_assign_operator_c *symbol) {
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   491
  TRACE("il_assign_operator_c");
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   492
  return (void *)symbol->variable_name;
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   493
}
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   494
181
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   495
/*| [NOT] any_identifier SENDTO */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   496
// SYM_REF2(il_assign_out_operator_c, option, variable_name)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   497
void *function_call_param_iterator_c::visit(il_assign_out_operator_c *symbol) {
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   498
  TRACE("il_assign_out_operator_c");
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   499
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   500
  // TODO : Handle not_param !!!
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   501
  // we do not yet support it, so it is best to simply stop than to fail silently...
202
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   502
  // if (NULL != symbol->option) ERROR;
181
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   503
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   504
  return (void *)symbol->variable_name;
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   505
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   506
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   507
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   508
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   509
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   510
/***************************************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   511
/* B.3 - Language ST (Structured Text) */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   512
/***************************************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   513
/***********************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   514
/* B 3.1 - Expressions */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   515
/***********************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   516
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   517
/*
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   518
SYM_REF2(function_invocation_c, function_name, parameter_assignment_list)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   519
*/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   520
void *function_call_param_iterator_c::visit(function_invocation_c *symbol) {
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   521
  TRACE("function_invocation_c");
202
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   522
  /* If the syntax parser is working correctly, exactly one of the 
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   523
   * following two symbols will be NULL, while the other is != NULL.
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   524
   */
247
560075ece524 Bug when function call result is a parameter of another function call fixed.
laurent
parents: 202
diff changeset
   525
  if (symbol == (function_invocation_c *)f_call) {
560075ece524 Bug when function call result is a parameter of another function call fixed.
laurent
parents: 202
diff changeset
   526
	if (symbol->   formal_param_list != NULL) return symbol->   formal_param_list->accept(*this);
560075ece524 Bug when function call result is a parameter of another function call fixed.
laurent
parents: 202
diff changeset
   527
    if (symbol->nonformal_param_list != NULL) return symbol->nonformal_param_list->accept(*this);
560075ece524 Bug when function call result is a parameter of another function call fixed.
laurent
parents: 202
diff changeset
   528
  }
202
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   529
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   530
  return NULL;
181
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   531
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   532
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   533
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   534
/********************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   535
/* B 3.2 Statements */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   536
/********************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   537
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   538
/*********************************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   539
/* B 3.2.1 Assignment Statements */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   540
/*********************************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   541
/*
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   542
SYM_REF2(assignment_statement_c, l_exp, r_exp)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   543
*/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   544
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   545
/*****************************************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   546
/* B 3.2.2 Subprogram Control Statements */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   547
/*****************************************/
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   548
/*  RETURN */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   549
// SYM_REF0(return_statement_c)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   550
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   551
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   552
/* fb_name '(' [param_assignment_list] ')' */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   553
/* param_assignment_list -> may be NULL ! */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   554
// SYM_REF2(fb_invocation_c, fb_name, param_assignment_list)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   555
void *function_call_param_iterator_c::visit(fb_invocation_c *symbol) {
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   556
  TRACE("fb_invocation_c");
202
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   557
  /* If the syntax parser is working correctly, only one of the 
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   558
   * following two symbols will be != NULL.
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   559
   * However, both may be NULL simultaneously!
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   560
   */
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   561
  if (symbol->   formal_param_list != NULL) return symbol->   formal_param_list->accept(*this);
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   562
  if (symbol->nonformal_param_list != NULL) return symbol->nonformal_param_list->accept(*this);
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   563
da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
parents: 181
diff changeset
   564
  return NULL;
181
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   565
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   566
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   567
/* helper symbol for fb_invocation */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   568
/* param_assignment_list ',' param_assignment */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   569
// SYM_LIST(param_assignment_list_c)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   570
void *function_call_param_iterator_c::visit(param_assignment_list_c *symbol) {
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   571
  TRACE("param_assignment_list_c");
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   572
  return search_list(symbol);
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   573
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   574
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   575
/*  variable_name ASSIGN expression */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   576
// SYM_REF2(input_variable_param_assignment_c, variable_name, expression)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   577
void *function_call_param_iterator_c::visit(input_variable_param_assignment_c *symbol) {
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   578
  TRACE("input_variable_param_assignment_c");
449
3c6225521059 Semantic verification: Add compatibility check for parameter direction in function invocation.
Mario de Sousa <msousa@fe.up.pt>
parents: 350
diff changeset
   579
  current_assign_direction = assign_in;
181
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   580
  return handle_parameter_assignment(symbol->variable_name, symbol->expression);
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   581
}
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   582
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   583
/* [NOT] variable_name '=>' variable */
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   584
// SYM_REF4(output_variable_param_assignment_c, not_param, variable_name, variable, unused)
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   585
void *function_call_param_iterator_c::visit(output_variable_param_assignment_c *symbol) {
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   586
  TRACE("output_variable_param_assignment_c");
38d6eb056260 Moving absyntax utility files out from stage4/generate_c
mario
parents:
diff changeset
   587
  // TODO : Handle not_param !!!
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   588
  if (NULL != symbol->not_param) ERROR;  // we do not yet support it, so it is best to simply stop than to fail silently...
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   589
449
3c6225521059 Semantic verification: Add compatibility check for parameter direction in function invocation.
Mario de Sousa <msousa@fe.up.pt>
parents: 350
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   590
  current_assign_direction = assign_out;
181
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   591
  return handle_parameter_assignment(symbol->variable_name, symbol->variable);
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   592
}
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   593
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   594
/* helper CLASS for output_variable_param_assignment */
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   595
// SYM_REF0(not_paramassign_c)
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   596
// TODO... ???
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   597
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   598