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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.

    23

 */

    24

    25

/*

    26

 * 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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 */

    32

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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.

    45

 */

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    47

    48

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#include "function_call_param_iterator.hh"

    50

#include <strings.h>

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#include "../main.hh" // required for ERROR() and ERROR_MSG() macros.

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    53

    54

//#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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    61

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    63

    64

    65

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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:

    69

      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>).

    75

           */

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          /* we do nothing... */

    77

        } else {

    78

          param_count++;

    79

          if (param_count == iterate_nf_next_param) {

    80

            return list->get_element(i);

    81

          }

    82

        }

    83

      }

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      return NULL;

    85

      break;

    86

    87

    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;

   104

      break;

   105

   106

    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;

   111

      }

   112

      return NULL;

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      break;

   114

  } /* 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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   135

      if (variable_name2 == NULL) ERROR;

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   137

      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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   148

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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;

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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?)

   168

   */

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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,

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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;

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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;

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  void *res = f_call->accept(*this);

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  return (symbol_c *)res;

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}

   192

   193

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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...

   198

 *

   199

 * Returns whatever is being passed to the parameter!

   200

 */

   201

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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/* Search for the value passed to the parameter named <param_name>...  */

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symbol_c *function_call_param_iterator_c::search_f(symbol_c *param_name) {

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  current_value = NULL;

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  current_assign_direction = assign_none;

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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;

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  current_operation = function_call_param_iterator_c::search_f_op;

   220

  void *res = f_call->accept(*this);

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  current_value = (symbol_c *)res;

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  return (symbol_c *)res;

   223

}

   224

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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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   231

   232

/* 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;

   235

}

   236

   237

/* 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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}

   241

   242

   243

/********************************/

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/* B 1.7 Configuration elements */

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/********************************/

   246

   247

/*

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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)

   262

*/

   263

   264

/*

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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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*/

   270

/*

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SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)

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*/

   273

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/* task_configuration_list program_configuration_list */

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/*

   276

SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)

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*/

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   279

/* helper symbol for single_resource_declaration */

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/*

   281

SYM_LIST(task_configuration_list_c)

   282

*/

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/* helper symbol for single_resource_declaration */

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/*

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SYM_LIST(program_configuration_list_c)

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*/

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/* helper symbol for

   290

 *  - access_path

   291

 *  - instance_specific_init

   292

 */

   293

/*

   294

SYM_LIST(any_fb_name_list_c)

   295

*/

   296

   297

/*  [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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*/

   301

   302

/*  prev_declared_program_name '.' symbolic_variable */

   303

/*

   304

SYM_REF2(program_output_reference_c, program_name, symbolic_variable)

   305

*/

   306

   307

/*  TASK task_name task_initialization */

   308

/*

   309

SYM_REF2(task_configuration_c, task_name, task_initialization)

   310

*/

   311

   312

/*  '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */

   313

/*

   314

SYM_REF4(task_initialization_c, single_data_source, interval_data_source, priority_data_source, unused)

   315

*/

   316

   317

/*  PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */

   318

// 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) {

   320

  TRACE("program_configuration_c");

   321

  return symbol->prog_conf_elements->accept(*this);

   322

}

   323

   324

/* prog_conf_elements ',' prog_conf_element */

   325

// SYM_LIST(prog_conf_elements_c)

   326

void *function_call_param_iterator_c::visit(prog_conf_elements_c *symbol) {

   327

  TRACE("prog_conf_elements_c");

   328

  return search_list(symbol);

   329

}

   330

   331

/*  fb_name WITH task_name */

   332

/*

   333

SYM_REF2(fb_task_c, fb_name, task_name)

   334

*/

   335

   336

/*  any_symbolic_variable ASSIGN prog_data_source */

   337

// SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source)

   338

void *function_call_param_iterator_c::visit(prog_cnxn_assign_c *symbol) {

   339

  TRACE("prog_cnxn_assign_c");

   340

   341

  /* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario)

   342

   *       do not understand the semantics that should be implmeneted if it is not a

   343

   *        symbolic_variable, so for the moment we simply give up!

   344

   */

   345

  symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable);

   346

  if (NULL == symb_var)

   347

    ERROR;

   348

   349

  current_assign_direction = assign_in;

   350

  return handle_parameter_assignment(symb_var->var_name, symbol->prog_data_source);

   351

}

   352

   353

/* any_symbolic_variable SENDTO data_sink */

   354

// SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, prog_data_source)

   355

void *function_call_param_iterator_c::visit(prog_cnxn_sendto_c *symbol) {

   356

  TRACE("prog_cnxn_sendto_c");

   357

   358

  /* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario)

   359

   *       do not understand the semantics that should be implmeneted if it is not a

   360

   *        symbolic_variable, so for the moment we simply give up!

   361

   */

   362

  symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable);

   363

  if (NULL == symb_var)

   364

    ERROR;

   365

   366

  current_assign_direction = assign_out;

   367

  return handle_parameter_assignment(symb_var->var_name, symbol->data_sink);

   368

}

   369

   370

/* VAR_CONFIG instance_specific_init_list END_VAR */

   371

/*

   372

SYM_REF2(instance_specific_initializations_c, instance_specific_init_list, unused)

   373

*/

   374

   375

/* helper symbol for instance_specific_initializations */

   376

/*

   377

SYM_LIST(instance_specific_init_list_c)

   378

*/

   379

   380

/* resource_name '.' program_name '.' {fb_name '.'}

   381

    ((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization))

   382

*/

   383

/*

   384

SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization)

   385

*/

   386

   387

/* helper symbol for instance_specific_init */

   388

/* function_block_type_name ':=' structure_initialization */

   389

/*

   390

SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization)

   391

*/

   392

   393

   394

   395

/****************************************/

   396

/* B.2 - Language IL (Instruction List) */

   397

/****************************************/

   398

/***********************************/

   399

/* B 2.1 Instructions and Operands */

   400

/***********************************/

   401

   402

/* | function_name [il_operand_list] */

   403

// SYM_REF2(il_function_call_c, function_name, il_operand_list)

   404

void *function_call_param_iterator_c::visit(il_function_call_c *symbol) {

   405

  TRACE("il_function_call_c");

   406

  if (NULL != symbol->il_operand_list)

   407

    return symbol->il_operand_list->accept(*this);

   408

  return NULL;

   409

}

   410

   411

   412

/* | function_name '(' eol_list [il_param_list] ')' */

   413

// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)

   414

void *function_call_param_iterator_c::visit(il_formal_funct_call_c *symbol) {

   415

  TRACE("il_formal_funct_call_c");

   416

  if (NULL != symbol->il_param_list)

   417

    return symbol->il_param_list->accept(*this);

   418

  return NULL;

   419

}

   420

   421

   422

/*   il_call_operator prev_declared_fb_name

   423

 * | il_call_operator prev_declared_fb_name '(' ')'

   424

 * | il_call_operator prev_declared_fb_name '(' eol_list ')'

   425

 * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'

   426

 * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'

   427

 */

   428

// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)

   429

void *function_call_param_iterator_c::visit(il_fb_call_c *symbol) {

   430

  TRACE("il_fb_call_c");

   431

  /* the following should never occur. In reality the syntax parser

   432

   * will guarantee that they never occur, but it makes it easier to

   433

   * understand the remaining code :-)

   434

   */

   435

  //if ((NULL == symbol->il_operand_list) && (NULL == symbol->il_param_list)) ERROR;

   436

  //if ((NULL != symbol->il_operand_list) && (NULL != symbol->il_param_list)) ERROR;

   437

   438

  if (NULL != symbol->il_operand_list)

   439

    return symbol->il_operand_list->accept(*this);

   440

  if (NULL != symbol->il_param_list)

   441

    return symbol->il_param_list->accept(*this);

   442

  return NULL;

   443

}

   444

   445

/* | il_operand_list ',' il_operand */

   446

// SYM_LIST(il_operand_list_c)

   447

void *function_call_param_iterator_c::visit(il_operand_list_c *symbol) {

   448

  TRACE("il_operand_list_c");

   449

  return search_list(symbol);

   450

}

   451

   452

   453

/* | il_initial_param_list il_param_instruction */

   454

// SYM_LIST(il_param_list_c)

   455

void *function_call_param_iterator_c::visit(il_param_list_c *symbol) {

   456

  TRACE("il_param_list_c");

   457

  return search_list(symbol);

   458

}

   459

   460

/*  il_assign_operator il_operand

   461

 * | il_assign_operator '(' eol_list simple_instr_list ')'

   462

 */

   463

// SYM_REF4(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list, unused)

   464

void *function_call_param_iterator_c::visit(il_param_assignment_c *symbol) {

   465

  TRACE("il_param_assignment_c");

   466

   467

  symbol_c *expression = NULL;

   468

  if (!((NULL != symbol->simple_instr_list) ^ (NULL != symbol->il_operand))) ERROR;

   469

  if    (NULL != symbol->simple_instr_list) expression = symbol->simple_instr_list;

   470

  if    (NULL != symbol->il_operand       ) expression = symbol->il_operand;

   471

   472

  current_assign_direction = assign_in;

   473

  return handle_parameter_assignment((symbol_c *)symbol->il_assign_operator->accept(*this), expression);

   474

}

   475

   476

/*  il_assign_out_operator variable */

   477

// SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable);

   478

void *function_call_param_iterator_c::visit(il_param_out_assignment_c *symbol) {

   479

  TRACE("il_param_out_assignment_c");

   480

  current_assign_direction = assign_out;

   481

  return handle_parameter_assignment((symbol_c *)symbol->il_assign_out_operator->accept(*this), symbol->variable);

   482

}

   483

   484

   485

/*******************/

   486

/* B 2.2 Operators */

   487

/*******************/

   488

/*  any_identifier ASSIGN */

   489

// SYM_REF1(il_assign_operator_c, variable_name)

   490

void *function_call_param_iterator_c::visit(il_assign_operator_c *symbol) {

   491

  TRACE("il_assign_operator_c");

   492

  return (void *)symbol->variable_name;

   493

}

   494

   495

/*| [NOT] any_identifier SENDTO */

   496

// SYM_REF2(il_assign_out_operator_c, option, variable_name)

   497

void *function_call_param_iterator_c::visit(il_assign_out_operator_c *symbol) {

   498

  TRACE("il_assign_out_operator_c");

   499

   500

  // TODO : Handle not_param !!!

   501

  // we do not yet support it, so it is best to simply stop than to fail silently...

   502

  // if (NULL != symbol->option) ERROR;

   503

   504

  return (void *)symbol->variable_name;

   505

}

   506

   507

   508

   509

   510

/***************************************/

   511

/* B.3 - Language ST (Structured Text) */

   512

/***************************************/

   513

/***********************/

   514

/* B 3.1 - Expressions */

   515

/***********************/

   516