text: /*
   *  matiec - a compiler for the programming languages defined in IEC 61131-3
   *
   *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
   *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
   *
   *  This program is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 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.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
   *
   *
   * 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 compiler.
   *
   * Based on the
   * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
   *
   */
  
  
  /*
   * Function call parameter iterator.
   *
   * This is part of the 4th stage that generates
   * a c++ source program equivalent to the IL and ST
   * code.
   */
  
  /* given a function_body_c, iterate through each
   * function/FB call in that code.
   */
  
  
  #include "function_call_iterator.hh"
  #include "../main.hh" // required for ERROR() and ERROR_MSG() macros.
  
  
  //#define DEBUG
  #ifdef DEBUG
  #define TRACE(classname) printf("\n____%s____\n",classname);
  #else
  #define TRACE(classname)
  #endif
  
  
  
  
  
  /* initialise the iterator object.
   * We must be given a reference to the function declaration
   * that will be analysed...
   */
  function_call_iterator_c::function_call_iterator_c(symbol_c *symbol) {
    this->start_symbol = symbol;
    next_fcall = fcall_count = 0;
    current_finvocation = NULL;
    current_fcall_name = NULL;
  }
  
  /* Skip to the next function call. After object creation,
   * the object references _before_ the first, so
   * this function must be called once to get the object to
   * reference the first function call...
   *
   * Returns the function_invocation_c!
   */
  //function_invocation_c *next(void) {TRACE("function_call_iterator_c::next(): called ");
  symbol_c *function_call_iterator_c::next(void) {TRACE("function_call_iterator_c::next(): called ");
    fcall_count = 0;
    next_fcall++;
    current_finvocation = NULL;
    current_fcall_name = NULL;
  
    start_symbol->accept(*this);
    return current_finvocation;
  }
  
  /* Returns the name of the currently referenced function invocation */
  token_c *function_call_iterator_c::fname(void) {
    token_c *fname_sym = dynamic_cast<token_c *>(current_fcall_name);
    if (fname_sym == NULL) ERROR;
    return fname_sym;
  }
  
  
  /***************************************/
  /* B.3 - Language ST (Structured Text) */
  /***************************************/
  /***********************/
  /* B 3.1 - Expressions */
  /***********************/
    void *function_call_iterator_c::visit(function_invocation_c *symbol) {
      fcall_count++;
      if (next_fcall == fcall_count) {
        current_finvocation = symbol;
        current_fcall_name = symbol->function_name;
      }
      return NULL;
    }
  
  
  
  /****************************************/
  /* B.2 - Language IL (Instruction List) */
  /****************************************/
  /***********************************/
  /* B 2.1 Instructions and Operands */
  /***********************************/
  
  /* | function_name [il_operand_list] */
  // SYM_REF2(il_function_call_c, function_name, il_operand_list)
    void *function_call_iterator_c::visit(il_function_call_c *symbol) {
      fcall_count++;
      if (next_fcall == fcall_count) {
        current_finvocation = symbol;
        current_fcall_name = symbol->function_name;
      }
      return NULL;
    }
  
  
  
  /* | function_name '(' eol_list [il_param_list] ')' */
  // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
    void *function_call_iterator_c::visit(il_formal_funct_call_c *symbol) {
      fcall_count++;
      if (next_fcall == fcall_count) {
        current_finvocation = symbol;
        current_fcall_name = symbol->function_name;
      }
      return NULL;
    }
  
  
  
  
  
  