1

/*

     2

 * (c) 2003 Mario de Sousa

     3

 *

     4

 * Offered to the public under the terms of the GNU General Public License

     5

 * as published by the Free Software Foundation; either version 2 of the

     6

 * License, or (at your option) any later version.

     7

 *

     8

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

     9

 * WITHOUT ANY WARRANTY; without even the implied warranty of

    10

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

    11

 * Public License for more details.

    12

 *

    13

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

    14

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

    15

 */

    16

    17

/*

    18

 * An IEC 61131-3 IL and ST compiler.

    19

 *

    20

 * Based on the

    21

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

    22

 *

    23

 */

    24

    25

/* Determine the data type of a specific variable instance, including

    26

 * function block instances.

    27

 * A reference to the relevant variable declaration is returned.

    28

 * The variable instance may NOT be a member of a structure of a member

    29

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

    30

 *

    31

 * example:

    32

 *    window.points[1].coordinate.x

    33

 *    window.points[1].colour

    34

 *    etc... ARE NOT ALLOWED!

    35

 *

    36

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

    37

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

    38

 *   'window' !!

    39

 *

    40

 *

    41

 * If you need to pass a complete name of a variable instance (such as

    42

 * 'window.points[1].coordinate.x') use the search_varfb_instance_type_c instead!

    43

 */

    44

    45

/* Note that current_type_decl that this class returns may reference the

    46

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

    47

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

    48

 * x : AAA;

    49

 * where the AAA type is previously declared as whatever.

    50

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

    51

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

    52

 *

    53

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

    54

 * we return a reference to the declaration!!

    55

 */

    56

#include "absyntax_utils.hh"

    57

    58

    59

search_var_instance_decl_c::search_var_instance_decl_c(symbol_c *search_scope) {

    60

  this->current_vartype = none_vt;

    61

  this->search_scope = search_scope;

    62

  this->search_name = NULL;

    63

  this->current_type_decl = NULL;

    64

}

    65

    66

symbol_c *search_var_instance_decl_c::get_decl(symbol_c *variable_instance_name) {

    67

  this->current_vartype = none_vt;

    68

  this->search_name = variable_instance_name;

    69

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

    70

}

    71

    72

unsigned int search_var_instance_decl_c::get_vartype() {

    73

  return current_vartype;

    74

}

    75

    76

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

    77

/* B 0 - Programming Model */

    78

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

    79

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

    80

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

    81

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

    82

   */

    83

  return NULL;

    84

}

    85

    86

    87

    88

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

    89

/* B 1.4.3 - Declaration & Initialization */

    90

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

    91

    92

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

    93

// SYM_REF2(edge_declaration_c, edge, var1_list)

    94

// TODO

    95

    96

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

    97

  current_vartype = input_vt;

    98

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

    99

  if (res == NULL) {

   100

    current_vartype = none_vt;

   101

  }

   102

  return res;

   103

}

   104

   105

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

   106

/* option -> may be NULL ! */

   107

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

   108

  current_vartype = output_vt;

   109

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

   110

  if (res == NULL) {

   111

    current_vartype = none_vt;

   112

  }

   113

  return res;

   114

}

   115

   116

/*  VAR_IN_OUT var_declaration_list END_VAR */

   117

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

   118

  current_vartype = inoutput_vt;

   119

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

   120

  if (res == NULL) {

   121

    current_vartype = none_vt;

   122

  }

   123

  return res;

   124

}

   125

   126

/* ENO : BOOL */

   127

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

   128

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

   129

    return symbol->type;

   130

  return NULL;

   131

}

   132

   133

   134

/* VAR [CONSTANT] var_init_decl_list END_VAR */

   135

/* option -> may be NULL ! */

   136

/* helper symbol for input_declarations */

   137

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

   138

  current_vartype = private_vt;

   139

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

   140

  if (res == NULL) {

   141

    current_vartype = none_vt;

   142

  }

   143

  return res;

   144

}

   145

   146

/*  VAR RETAIN var_init_decl_list END_VAR */

   147

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

   148

  current_vartype = private_vt;

   149

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

   150

  if (res == NULL) {

   151

    current_vartype = none_vt;

   152

  }

   153

  return res;

   154

}

   155

   156

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

   157

/* option -> may be NULL ! */

   158

//SYM_REF2(located_var_declarations_c, option, located_var_decl_list)

   159

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

   160

  current_vartype = located_vt;

   161

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

   162

  if (res == NULL) {

   163

    current_vartype = none_vt;

   164

  }

   165

  return res;

   166

}

   167

   168

/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */

   169

/* option -> may be NULL ! */

   170

//SYM_REF2(external_var_declarations_c, option, external_declaration_list)

   171

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

   172

  current_vartype = external_vt;

   173

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

   174

  if (res == NULL) {

   175

    current_vartype = none_vt;

   176

  }

   177

  return res;

   178

}

   179

   180

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

   181

/* option -> may be NULL ! */

   182

//SYM_REF2(global_var_declarations_c, option, global_var_decl_list)

   183

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

   184

  current_vartype = global_vt;

   185

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

   186

  if (res == NULL) {

   187

    current_vartype = none_vt;

   188

  }

   189

  return res;

   190

}

   191

   192

/* var1_list is one of the following...

   193

 *    simple_spec_init_c *

   194

 *    subrange_spec_init_c *

   195

 *    enumerated_spec_init_c *

   196

 */

   197

// SYM_REF2(var1_init_decl_c, var1_list, spec_init)

   198

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

   199

  current_type_decl = symbol->spec_init;

   200

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

   201

}

   202

   203

/* var1_list ',' variable_name */

   204

// SYM_LIST(var1_list_c)

   205

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

   206

  list_c *list = symbol;

   207

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

   208

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

   209

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

   210

      return current_type_decl;

   211

  }

   212

  return NULL;

   213

}

   214

   215

/* name_list ':' function_block_type_name ASSIGN structure_initialization */

   216

/* structure_initialization -> may be NULL ! */

   217

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

   218

  current_type_decl = symbol->function_block_type_name;

   219

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

   220

}

   221

   222

/* name_list ',' fb_name */

   223

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

   224

  list_c *list = symbol;

   225

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

   226

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

   227

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

   228

      return current_type_decl;

   229

  }

   230

  return NULL;

   231

}

   232

   233

/* var1_list ':' array_spec_init */

   234

// SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)

   235

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

   236

  current_type_decl = symbol->array_spec_init;

   237

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

   238

}

   239

   240

/*  var1_list ':' initialized_structure */

   241

// SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)

   242

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

   243

  current_type_decl = symbol->initialized_structure;

   244

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

   245

}

   246

   247

/*  var1_list ':' array_specification */

   248

// SYM_REF2(array_var_declaration_c, var1_list, array_specification)

   249

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

   250

  current_type_decl = symbol->array_specification;

   251

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

   252

}

   253

   254

/*  var1_list ':' structure_type_name */

   255

// SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)

   256

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

   257

  current_type_decl = symbol->structure_type_name;

   258

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

   259

}

   260

   261

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

   262

/* variable_name -> may be NULL ! */

   263

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

   264

// TODO!!

   265

   266

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

   267

// SYM_REF2(external_declaration_c, global_var_name, specification)

   268

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

   269

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

   270

      return symbol->specification;

   271

  return NULL;

   272

}

   273

   274

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

   275

/* type_specification ->may be NULL ! */

   276

// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)

   277

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

   278

  if (symbol->type_specification != NULL) {

   279

    current_type_decl = symbol->type_specification;

   280

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

   281

  }

   282

  else

   283

    return NULL;

   284

}

   285

   286

/*| global_var_name location */

   287

//SYM_REF2(global_var_spec_c, global_var_name, location)

   288

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

   289

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

   290

      return current_type_decl;

   291

  else

   292

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

   293

}

   294

   295

/*| global_var_list ',' global_var_name */

   296

//SYM_LIST(global_var_list_c)

   297

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

   298

  list_c *list = symbol;

   299

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

   300

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

   301

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

   302

      return current_type_decl;

   303

  }

   304

  return NULL;

   305

}

   306

   307

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

   308

/* variable_name -> may be NULL ! */

   309

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

   310

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

   311

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

   312

    return symbol->located_var_spec_init;

   313

  else {

   314

    current_type_decl = symbol->located_var_spec_init;

   315

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

   316

  }

   317

}

   318

   319

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

   320

/* type_specification ->may be NULL ! */

   321

// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)

   322

// TODO!!

   323

   324

/*  AT direct_variable */

   325

// SYM_REF2(location_c, direct_variable, unused)

   326

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

   327

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

   328

    return current_type_decl;

   329

  else

   330

    return NULL;

   331

}

   332

   333

/*| global_var_list ',' global_var_name */

   334

// SYM_LIST(global_var_list_c)

   335

// TODO!!

   336

   337

/*  var1_list ':' single_byte_string_spec */

   338

// SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)

   339

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

   340

  current_type_decl = symbol->single_byte_string_spec;

   341

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

   342

}

   343

   344

/*  STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */

   345

/* integer ->may be NULL ! */

   346

/* single_byte_character_string ->may be NULL ! */

   347

// SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)

   348

// TODO!!

   349

   350

/*  var1_list ':' double_byte_string_spec */

   351

// SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)

   352

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

   353

  current_type_decl = symbol->double_byte_string_spec;

   354

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

   355

}

   356

   357

/*  WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */

   358

/* integer ->may be NULL ! */

   359

/* double_byte_character_string ->may be NULL ! */

   360

// SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)

   361

// TODO!!

   362

   363

/*  variable_name incompl_location ':' var_spec */

   364

// SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)

   365

// TODO!!

   366

   367

/*  AT incompl_location_token */

   368

// SYM_TOKEN(incompl_location_c)

   369

// TODO!!

   370

   371

   372

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

   373

/* B.1.5 - Program organization units */

   374

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

   375

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

   376

/* B 1.5.1 - Functions */

   377

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

   378

// SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body)

   379

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

   380

  /* functions have a variable named after themselves, to store

   381

   * the variable that will be returned!!

   382

   */

   383

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

   384

      return symbol->type_name;

   385

   386

  /* no need to search through all the body, so we only

   387

   * visit the variable declarations...!

   388

   */

   389

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

   390

}

   391

   392

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

   393

/* B 1.5.2 - Function Blocks */

   394

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

   395

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

   396

  /* no need to search through all the body, so we only

   397

   * visit the variable declarations...!

   398

   */

   399

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

   400

}

   401

   402

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

   403

/* B 1.5.3 - Programs */

   404

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

   405

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

   406

  /* no need to search through all the body, so we only

   407

   * visit the variable declarations...!

   408

   */

   409

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

   410

}

   411

   412

   413

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

   414

/* B 1.7 Configuration elements */

   415

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

   416

   417

/*

   418

CONFIGURATION configuration_name

   419

   optional_global_var_declarations

   420

   (resource_declaration_list | single_resource_declaration)

   421

   optional_access_declarations

   422

   optional_instance_specific_initializations

   423

END_CONFIGURATION

   424

*/

   425

/*

   426

SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)

   427

*/

   428

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

   429

  /* no need to search through all the configuration, so we only

   430

   * visit the global variable declarations...!

   431

   */

   432

  if (symbol->global_var_declarations != NULL)

   433

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

   434

  else

   435

    return NULL;

   436

}

   437

   438

/*

   439

RESOURCE resource_name ON resource_type_name

   440

   optional_global_var_declarations

   441

   single_resource_declaration

   442

END_RESOURCE

   443

*/

   444

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

   445

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

   446

  /* no need to search through all the resource, so we only

   447

   * visit the global variable declarations...!

   448

   */

   449

  if (symbol->global_var_declarations != NULL)

   450

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

   451

  else

   452

    return NULL;

   453

}

   454

   455

/* task_configuration_list program_configuration_list */

   456

// SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)

   457

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

   458

  /* no need to search through all the resource,

   459

   * and there is no global variable declarations...!

   460

   */

   461

  return NULL;

   462

}

   463

   464

#if 0

   465

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

   466

/* B 1.4 - Variables */

   467

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

   468

SYM_REF2(symbolic_variable_c, var_name, unused)

   469

   470

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

   471

/* B.1.4.1   Directly Represented Variables */

   472

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

   473

SYM_TOKEN(direct_variable_c)

   474

   475

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

   476

/* B.1.4.2   Multi-element Variables */

   477

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

   478

/*  subscripted_variable '[' subscript_list ']' */

   479

SYM_REF2(array_variable_c, subscripted_variable, subscript_list)

   480

   481

/* subscript_list ',' subscript */

   482

SYM_LIST(subscript_list_c)

   483

   484

/*  record_variable '.' field_selector */

   485

/*  WARNING: input and/or output variables of function blocks

   486

 *           may be accessed as fields of a tructured variable!

   487

 *           Code handling a structured_variable_c must take

   488

 *           this into account!

   489

 */

   490

SYM_REF2(structured_variable_c, record_variable, field_selector)

   491

   492

   493

   494

};

   495

#endif