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/*

     2

 *  matiec - a compiler for the programming languages defined in IEC 61131-3

     3

 *

     4

 *  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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 *

    17

 *  You should have received a copy of the GNU General Public License

    18

 *  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.

    27

 *

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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

    33

/*

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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.

    41

 *

    42

 * Note that calls to next_nf() will only iterate through non-formal parameters,

    43

 * 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

 */

    46

    47

    48

    49

#include "function_call_param_iterator.hh"

    50

#include <strings.h>

    51

    52

    53

//#define DEBUG

    54

#ifdef DEBUG

    55

#define TRACE(classname) printf("\n____%s____\n",classname);

    56

#else

    57

#define TRACE(classname)

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#endif

    59

    60

#define ERROR error_exit(__FILE__,__LINE__)

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/* function defined in main.cc */

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extern void error_exit(const char *file_name, int line_no);

    63

    64

    65

    66

    67

    68

void *function_call_param_iterator_c::search_list(list_c *list) {

    69

  switch (current_operation) {

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    case iterate_nf_op:

    71

      for(int i = 0; i < list->n; i++) {

    72

        void *res = list->elements[i]->accept(*this);

    73

        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>).

    77

           */

    78

          /* we do nothing... */

    79

        } else {

    80

          param_count++;

    81

          if (param_count == iterate_nf_next_param) {

    82

            return list->elements[i];

    83

          }

    84

        }

    85

      }

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      return NULL;

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      break;

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    89

    case iterate_f_op:

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      for(int i = 0; i < list->n; i++) {

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        void *res = list->elements[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>).

    96

           */

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          param_count++;

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          if (param_count == iterate_f_next_param) {

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            return res;

   100

          }

   101

        } else {

   102

          /* we do nothing... */

   103

        }

   104

      }

   105

      return NULL;

   106

      break;

   107

   108

    case search_f_op:

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      for(int i = 0; i < list->n; i++) {

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        void *res = list->elements[i]->accept(*this);

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        if (res != NULL)

   112

          return res;

   113

      }

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      return NULL;

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      break;

   116

  } /* switch */

   117

  return NULL;

   118

}

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   120

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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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   129

    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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   134

    case search_f_op:

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      identifier_c *variable_name2 = dynamic_cast<identifier_c *>(variable_name);

   136

   137

      if (variable_name2 == NULL) ERROR;

   138

   139

      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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   146

  ERROR;

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  return NULL;

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}

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   150

   151

/* start off at the first parameter once again... */

   152

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) {

   163

  /* 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

   168

   *  il_formal_funct_call_c

   169

   *  ... (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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}

   175

   176

/* 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;

   187

  current_assign_direction = assign_none;

   188

  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;

   191

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

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  return (symbol_c *)res;

   193

}

   194

   195

   196

/* Skip to the next non-formal parameter. After object creation,

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 * the object references on parameter _before_ the first, so

   198

 * this function must be called once to get the object to

   199

 * reference the first parameter...

   200

 *

   201

 * Returns whatever is being passed to the parameter!

   202

 */

   203

symbol_c *function_call_param_iterator_c::next_nf(void) {

   204

  current_value = NULL;

   205

  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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}

   213

   214

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

   215

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

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  current_value = NULL;

   217

  current_assign_direction = assign_none;

   218

  if (NULL == param_name) ERROR;

   219

  search_param_name = dynamic_cast<identifier_c *>(param_name);

   220

  if (NULL == search_param_name) ERROR;

   221

  current_operation = function_call_param_iterator_c::search_f_op;

   222

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

   223

  current_value = (symbol_c *)res;

   224

  return (symbol_c *)res;

   225

}

   226

   227

/* 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);

   231

}

   232

   233

   234

/* Returns the value being passed to the current parameter. */

   235

symbol_c *function_call_param_iterator_c::get_current_value(void) {

   236

  return current_value;

   237

}

   238

   239

/* 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) {

   241

  return current_assign_direction;

   242

}

   243

   244

   245

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

   246

/* B 1.7 Configuration elements */

   247

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

   248

   249

/*

   250

CONFIGURATION configuration_name

   251

   optional_global_var_declarations

   252

   (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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*/

   260

   261

/* helper symbol for configuration_declaration */

   262

/*

   263

SYM_LIST(resource_declaration_list_c)

   264

*/

   265

   266

/*

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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

   271

*/

   272

/*

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

   274

*/

   275

   276

/* task_configuration_list program_configuration_list */

   277

/*

   278

SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)

   279

*/

   280

   281

/* helper symbol for single_resource_declaration */

   282

/*

   283

SYM_LIST(task_configuration_list_c)

   284

*/

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   286

/* helper symbol for single_resource_declaration */

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/*

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SYM_LIST(program_configuration_list_c)

   289

*/

   290

   291

/* helper symbol for

   292

 *  - access_path

   293

 *  - instance_specific_init

   294

 */

   295

/*

   296

SYM_LIST(any_fb_name_list_c)

   297

*/

   298

   299

/*  [resource_name '.'] global_var_name ['.' structure_element_name] */

   300

/*

   301

SYM_REF4(global_var_reference_c, resource_name, global_var_name, structure_element_name, unused)

   302

*/

   303

   304

/*  prev_declared_program_name '.' symbolic_variable */

   305

/*

   306

SYM_REF2(program_output_reference_c, program_name, symbolic_variable)

   307

*/

   308

   309

/*  TASK task_name task_initialization */

   310

/*

   311

SYM_REF2(task_configuration_c, task_name, task_initialization)

   312

*/

   313

   314

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

   315

/*

   316

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

   317

*/

   318

   319

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

   320

// SYM_REF6(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements, unused)

   321

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

   322

  TRACE("program_configuration_c");

   323

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

   324

}

   325

   326

/* prog_conf_elements ',' prog_conf_element */

   327

// SYM_LIST(prog_conf_elements_c)

   328

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

   329

  TRACE("prog_conf_elements_c");

   330

  return search_list(symbol);

   331

}

   332

   333

/*  fb_name WITH task_name */

   334

/*

   335

SYM_REF2(fb_task_c, fb_name, task_name)

   336

*/

   337

   338

/*  any_symbolic_variable ASSIGN prog_data_source */

   339

// SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source)

   340

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

   341

  TRACE("prog_cnxn_assign_c");

   342

   343

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

   344

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

   345

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

   346

   */

   347

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

   348

  if (NULL == symb_var)

   349

    ERROR;

   350

   351

  current_assign_direction = assign_in;

   352

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

   353

}

   354

   355

/* any_symbolic_variable SENDTO data_sink */

   356

// SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, prog_data_source)

   357

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

   358

  TRACE("prog_cnxn_sendto_c");

   359

   360

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

   361

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

   362

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

   363

   */

   364

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

   365

  if (NULL == symb_var)

   366

    ERROR;

   367

   368

  current_assign_direction = assign_out;

   369

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

   370

}

   371

   372

/* VAR_CONFIG instance_specific_init_list END_VAR */

   373

/*

   374

SYM_REF2(instance_specific_initializations_c, instance_specific_init_list, unused)

   375

*/

   376

   377

/* helper symbol for instance_specific_initializations */

   378

/*

   379

SYM_LIST(instance_specific_init_list_c)

   380

*/

   381

   382

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

   383

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

   384

*/

   385

/*

   386

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

   387

*/

   388

   389

/* helper symbol for instance_specific_init */

   390

/* function_block_type_name ':=' structure_initialization */

   391

/*

   392

SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization)

   393

*/

   394

   395

   396

   397

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

   398

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

   399

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

   400

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

   401

/* B 2.1 Instructions and Operands */

   402

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

   403

   404

/* | function_name [il_operand_list] */

   405

// SYM_REF2(il_function_call_c, function_name, il_operand_list)

   406

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

   407

  TRACE("il_function_call_c");

   408

  if (NULL != symbol->il_operand_list)

   409

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

   410

  return NULL;

   411

}

   412

   413

   414

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

   415

// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)

   416

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

   417

  TRACE("il_formal_funct_call_c");

   418

  if (NULL != symbol->il_param_list)

   419

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

   420

  return NULL;

   421

}

   422

   423

   424

/*   il_call_operator prev_declared_fb_name

   425

 * | il_call_operator prev_declared_fb_name '(' ')'

   426

 * | il_call_operator prev_declared_fb_name '(' eol_list ')'

   427

 * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'

   428

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

   429

 */

   430

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

   431

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

   432

  TRACE("il_fb_call_c");

   433

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

   434

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

   435

   * understand the remaining code :-)

   436

   */

   437

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

   438

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

   439

   440

  if (NULL != symbol->il_operand_list)

   441

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

   442

  if (NULL != symbol->il_param_list)

   443

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

   444

  return NULL;

   445

}

   446

   447

/* | il_operand_list ',' il_operand */

   448

// SYM_LIST(il_operand_list_c)

   449

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

   450

  TRACE("il_operand_list_c");

   451

  return search_list(symbol);

   452

}

   453

   454

   455

/* | il_initial_param_list il_param_instruction */

   456

// SYM_LIST(il_param_list_c)

   457

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

   458

  TRACE("il_param_list_c");

   459

  return search_list(symbol);

   460

}

   461

   462

/*  il_assign_operator il_operand

   463

 * | il_assign_operator '(' eol_list simple_instr_list ')'

   464

 */

   465

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

   466

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

   467

  TRACE("il_param_assignment_c");

   468

   469

  // TODO : We do not yet handle a instruction list passed as parameter !!!

   470

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

   471

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

   472

   473

  current_assign_direction = assign_in;

   474

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

   475

}

   476

   477

/*  il_assign_out_operator variable */

   478

// SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable);

   479

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

   480

  TRACE("il_param_out_assignment_c");

   481

  current_assign_direction = assign_out;

   482

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

   483

}

   484

   485

   486

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

   487

/* B 2.2 Operators */

   488

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

   489

/*  any_identifier ASSIGN */

   490

// SYM_REF1(il_assign_operator_c, variable_name)

   491

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

   492

  TRACE("il_assign_operator_c");

   493

  return (void *)symbol->variable_name;

   494

}

   495

   496

/*| [NOT] any_identifier SENDTO */

   497

// SYM_REF2(il_assign_out_operator_c, option, variable_name)

   498

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

   499

  TRACE("il_assign_out_operator_c");

   500

   501

  // TODO : Handle not_param !!!

   502

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

   503

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

   504

   505

  return (void *)symbol->variable_name;

   506

}

   507

   508

   509

   510

   511

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

   512

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

   513

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

   514

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

   515

/* B 3.1 - Expressions */

   516

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

   517