1

/*

     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)

     5

 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant

     6

 *

     7

 *  This program is free software: you can redistribute it and/or modify

     8

 *  it under the terms of the GNU General Public License as published by

     9

 *  the Free Software Foundation, either version 3 of the License, or

    10

 *  (at your option) any later version.

    11

 *

    12

 *  This program is distributed in the hope that it will be useful,

    13

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

    14

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    15

 *  GNU General Public License for more details.

    16

 *

    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/>.

    19

 *

    20

 *

    21

 * This code is made available on the understanding that it will not be

    22

 * used in safety-critical situations without a full and competent review.

    23

 */

    24

    25

/*

    26

 * An IEC 61131-3 compiler.

    27

 *

    28

 * Based on the

    29

 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)

    30

 *

    31

 */

    32

    39

 * of a structure of an element of an array of ...

    40

 *

    42

 *    window.points[1].coordinate.x

    43

 *    window.points[1].colour

    48

 *

    49

 * This class must only be passed the name of the variable that will appear

    50

 * in the variable declaration. In the above examples, this would be

    78

 * name of a type, or the type declaration itself!

    79

 * For an example of the first, consider a variable declared as ...

    80

 * x : AAA;

    81

 * where the AAA type is previously declared as whatever.

    82

 * For an example of the second, consider a variable declared as ...

    83

 * x : array of int [10];  ---->  is allowed

    84

 *

    85

 * If it is the first, we will return a reference to the name, if the second

    86

 * we return a reference to the declaration!!

    87

 */

    90

#include "absyntax_utils.hh"

    91

    92

   230

search_var_instance_decl_c::search_var_instance_decl_c(symbol_c *search_scope) {

   231

  this->current_vartype = none_vt;

   232

  this->search_scope = search_scope;

   233

  this->search_name = NULL;

   234

  this->current_type_decl = NULL;

   235

}

   236

   238

  this->current_vartype = none_vt;

   240

  return (symbol_c *)search_scope->accept(*this);

   241

}

   242

   244

  this->current_vartype = none_vt;

   246

  search_scope->accept(*this);

   247

  return current_vartype;

   248

}

   249

   250

   251

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

   252

/* B 0 - Programming Model */

   253

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

   254

void *search_var_instance_decl_c::visit(library_c *symbol) {

   255

  /* we do not want to search multiple declaration scopes,

   256

   * so we do not visit all the functions, function blocks, etc...

   257

   */

   258

  return NULL;

   259

}

   260

   261

   262

   263

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

   264

/* B 1.4.3 - Declaration & Initialization */

   265

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

   266

   267

/* edge -> The F_EDGE or R_EDGE directive */

   268

// SYM_REF2(edge_declaration_c, edge, var1_list)

   269

// TODO

   270

   271

void *search_var_instance_decl_c::visit(input_declarations_c *symbol) {

   272

  current_vartype = input_vt;

   273

  void *res = symbol->input_declaration_list->accept(*this);

   274

  if (res == NULL) {

   275

    current_vartype = none_vt;

   276

  }

   277

  return res;

   278

}

   279

   280

/* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */

   281

/* option -> may be NULL ! */

   282

void *search_var_instance_decl_c::visit(output_declarations_c *symbol) {

   283

  current_vartype = output_vt;

   284

  void *res = symbol->var_init_decl_list->accept(*this);

   285

  if (res == NULL) {

   286

    current_vartype = none_vt;

   287

  }

   288

  return res;

   289

}

   290

   291

/*  VAR_IN_OUT var_declaration_list END_VAR */

   292

void *search_var_instance_decl_c::visit(input_output_declarations_c *symbol) {

   293

  current_vartype = inoutput_vt;

   294

  void *res = symbol->var_declaration_list->accept(*this);

   295

  if (res == NULL) {

   296

    current_vartype = none_vt;

   297

  }

   298

  return res;

   299

}

   300

   301

/* ENO : BOOL */

   302

void *search_var_instance_decl_c::visit(eno_param_declaration_c *symbol) {

   303

  if (compare_identifiers(symbol->name, search_name) == 0)

   304

    return symbol->type;

   305

  return NULL;

   306

}

   307

   308

   309

/* VAR [CONSTANT] var_init_decl_list END_VAR */

   310

/* option -> may be NULL ! */

   311

/* helper symbol for input_declarations */

   312

void *search_var_instance_decl_c::visit(var_declarations_c *symbol) {

   313

  current_vartype = private_vt;

   314

  void *res = symbol->var_init_decl_list->accept(*this);

   315

  if (res == NULL) {

   316

    current_vartype = none_vt;

   317

  }

   318

  return res;

   319

}

   320

   321

/*  VAR RETAIN var_init_decl_list END_VAR */

   322

void *search_var_instance_decl_c::visit(retentive_var_declarations_c *symbol) {

   323

  current_vartype = private_vt;

   324

  void *res = symbol->var_init_decl_list->accept(*this);

   325

  if (res == NULL) {

   326

    current_vartype = none_vt;

   327

  }

   328

  return res;

   329

}

   330

   331

/*  VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */

   332

/* option -> may be NULL ! */

   333

//SYM_REF2(located_var_declarations_c, option, located_var_decl_list)

   334

void *search_var_instance_decl_c::visit(located_var_declarations_c *symbol) {

   335

  current_vartype = located_vt;

   336

  void *res = symbol->located_var_decl_list->accept(*this);

   337

  if (res == NULL) {

   338

    current_vartype = none_vt;

   339

  }

   340

  return res;

   341

}

   342

   343

/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */

   344

/* option -> may be NULL ! */

   345

//SYM_REF2(external_var_declarations_c, option, external_declaration_list)

   346

void *search_var_instance_decl_c::visit(external_var_declarations_c *symbol) {

   347

  current_vartype = external_vt;

   348

  void *res = symbol->external_declaration_list->accept(*this);

   349

  if (res == NULL) {

   350

    current_vartype = none_vt;

   351

  }

   352

  return res;

   353

}

   354

   355

/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */

   356

/* option -> may be NULL ! */

   357

//SYM_REF2(global_var_declarations_c, option, global_var_decl_list)

   358

void *search_var_instance_decl_c::visit(global_var_declarations_c *symbol) {

   359

  current_vartype = global_vt;

   360

  void *res = symbol->global_var_decl_list->accept(*this);

   361

  if (res == NULL) {

   362

    current_vartype = none_vt;

   363

  }

   364

  return res;

   365

}

   366

   367

/* var1_list is one of the following...

   368

 *    simple_spec_init_c *

   369

 *    subrange_spec_init_c *

   370

 *    enumerated_spec_init_c *

   371

 */

   372

// SYM_REF2(var1_init_decl_c, var1_list, spec_init)

   373

void *search_var_instance_decl_c::visit(var1_init_decl_c *symbol) {

   374

  current_type_decl = symbol->spec_init;

   375

  return symbol->var1_list->accept(*this);

   376

}

   377

   378

/* var1_list ',' variable_name */

   379

// SYM_LIST(var1_list_c)

   380

void *search_var_instance_decl_c::visit(var1_list_c *symbol) {

   381

  list_c *list = symbol;

   382

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

   383

    if (compare_identifiers(list->elements[i], search_name) == 0)

   384

   /* by now, current_type_decl should be != NULL */

   385

      return current_type_decl;

   386

  }

   387

  return NULL;

   388

}

   389

   390

/* name_list ':' function_block_type_name ASSIGN structure_initialization */

   391

/* structure_initialization -> may be NULL ! */

   392

void *search_var_instance_decl_c::visit(fb_name_decl_c *symbol) {

   393

  current_type_decl = symbol->function_block_type_name;

   394

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

   395

}

   396

   397

/* name_list ',' fb_name */

   398

void *search_var_instance_decl_c::visit(fb_name_list_c *symbol) {

   399

  list_c *list = symbol;

   400

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

   401

    if (compare_identifiers(list->elements[i], search_name) == 0)

   403

      return current_type_decl;

   404

  }

   405

  return NULL;

   406

}

   407

   408

/* var1_list ':' array_spec_init */

   409

// SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)

   410

void *search_var_instance_decl_c::visit(array_var_init_decl_c *symbol) {

   411

  current_type_decl = symbol->array_spec_init;

   412

  return symbol->var1_list->accept(*this);

   413

}

   414

   415

/*  var1_list ':' initialized_structure */

   416

// SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)

   417

void *search_var_instance_decl_c::visit(structured_var_init_decl_c *symbol) {

   418

  current_type_decl = symbol->initialized_structure;

   419

  return symbol->var1_list->accept(*this);

   420

}

   421

   422

/*  var1_list ':' array_specification */

   423

// SYM_REF2(array_var_declaration_c, var1_list, array_specification)

   424

void *search_var_instance_decl_c::visit(array_var_declaration_c *symbol) {

   425

  current_type_decl = symbol->array_specification;

   426

  return symbol->var1_list->accept(*this);

   427

}

   428

   429

/*  var1_list ':' structure_type_name */

   430

// SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)

   431

void *search_var_instance_decl_c::visit(structured_var_declaration_c *symbol) {

   432

  current_type_decl = symbol->structure_type_name;

   433

  return symbol->var1_list->accept(*this);

   434

}

   435

   436

/*  [variable_name] location ':' located_var_spec_init */

   437

/* variable_name -> may be NULL ! */

   438

// SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)

   439

// TODO!!

   440

   441

/*  global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */

   442

// SYM_REF2(external_declaration_c, global_var_name, specification)

   443

void *search_var_instance_decl_c::visit(external_declaration_c *symbol) {

   444

  if (compare_identifiers(symbol->global_var_name, search_name) == 0)

   445

      return symbol->specification;

   446

  return NULL;

   447

}

   448

   449

/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */

   450

/* type_specification ->may be NULL ! */

   451

// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)

   452

void *search_var_instance_decl_c::visit(global_var_decl_c *symbol) {

   453

  if (symbol->type_specification != NULL) {

   454

    current_type_decl = symbol->type_specification;

   455

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

   456

  }

   457

  else

   458

    return NULL;

   459

}

   460

   461

/*| global_var_name location */

   462

//SYM_REF2(global_var_spec_c, global_var_name, location)

   463

void *search_var_instance_decl_c::visit(global_var_spec_c *symbol) {

   464

  if (symbol->global_var_name != NULL && compare_identifiers(symbol->global_var_name, search_name) == 0)

   465

      return current_type_decl;

   466

  else

   467

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

   468

}

   469

   470

/*| global_var_list ',' global_var_name */

   471

//SYM_LIST(global_var_list_c)

   472

void *search_var_instance_decl_c::visit(global_var_list_c *symbol) {

   473

  list_c *list = symbol;

   474

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

   475

    if (compare_identifiers(list->elements[i], search_name) == 0)

   476

      /* by now, current_type_decl should be != NULL */

   477

      return current_type_decl;

   478

  }

   479

  return NULL;

   480

}

   481

   482

/*  [variable_name] location ':' located_var_spec_init */

   483

/* variable_name -> may be NULL ! */

   484

//SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)

   485

void *search_var_instance_decl_c::visit(located_var_decl_c *symbol) {

   486

  if (symbol->variable_name != NULL && compare_identifiers(symbol->variable_name, search_name) == 0)

   487

    return symbol->located_var_spec_init;

   488

  else {

   489

    current_type_decl = symbol->located_var_spec_init;

   490

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

   491

  }

   492

}

   493

   494

/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */

   495

/* type_specification ->may be NULL ! */

   496

// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)

   497

// TODO!!

   498

   499

/*  AT direct_variable */

   500

// SYM_REF2(location_c, direct_variable, unused)

   501

void *search_var_instance_decl_c::visit(location_c *symbol) {

   502

  if (compare_identifiers(symbol->direct_variable, search_name) == 0)

   503

    return current_type_decl;

   504

  else

   505

    return NULL;

   506

}

   507

   508

/*| global_var_list ',' global_var_name */

   509

// SYM_LIST(global_var_list_c)

   510

// TODO!!

   511

   512

/*  var1_list ':' single_byte_string_spec */