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

    26

/*

    27

 * Code to be included into the code generated by the 4th stage.

    28

 *

    29

 * This is part of the 4th stage that generates

    30

 * a ST and IL source program equivalent to the IL and ST

    31

 * code.

    32

 * This is expected to be used mainly in debuging the syntax

    33

 * and lexical parser, and as a starting point for other

    34

 * 4th stages.

    35

 */

    36

    37

    38

    39

    40

    41

    42

// #include <stdio.h>  /* required for NULL */

    43

#include <string>

    44

#include <iostream>

    45

#include "generate_iec.hh"

    46

    47

#include "../stage4.hh"

    48

    49

    50

    51

    52

    53

    54

//class generate_iec_c: public iterator_visitor_c {

    55

class generate_iec_c: public visitor_c {

    56

  private:

    57

    stage4out_c &s4o;

    58

    59

    60

  public:

    61

    generate_iec_c(stage4out_c *s4o_ptr): s4o(*s4o_ptr) {}

    62

    ~generate_iec_c(void) {}

    63

    64

    65

  private:

    66

    67

void *print_token(token_c *token) {

    68

  return s4o.print(token->value);

    69

}

    70

    71

void *print_literal(symbol_c *type, symbol_c *value) {

    72

  type->accept(*this);

    73

  s4o.print("#");

    74

  value->accept(*this);

    75

  return NULL;

    76

}

    77

    78

void *print_list(list_c *list,

    79

			       std::string pre_elem_str = "",

    80

			       std::string inter_elem_str = "",

    81

			       std::string post_elem_str = "") {

    82

  if (list->n > 0) {

    83

    s4o.print(pre_elem_str);

    84

    list->elements[0]->accept(*this);

    85

  }

    86

    87

  for(int i = 1; i < list->n; i++) {

    88

    s4o.print(inter_elem_str);

    89

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

    90

  }

    91

    92

  if (list->n > 0)

    93

    s4o.print(post_elem_str);

    94

    95

  return NULL;

    96

}

    97

    98

    99

void *print_binary_expression(symbol_c *l_exp,

   100

			      symbol_c *r_exp,

   101

			      const char *operation) {

   102

  s4o.print("(");

   103

  l_exp->accept(*this);

   104

  s4o.print(operation);

   105

  r_exp->accept(*this);

   106

  s4o.print(")");

   107

  return NULL;

   108

}

   109

   110

void *print_unary_expression(symbol_c *exp,

   111

			     const char *operation) {

   112

  s4o.print(operation);

   113

  exp->accept(*this);

   114

  return NULL;

   115

}

   116

   117

   118

   119

   120

   121

  public:

   122

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

   123

/* 2.1.6 Pragmas */

   124

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

   125

void *visit(pragma_c *symbol) {return print_token(symbol);}

   126

   127

   128

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

   129

/* B 0 - Programming Model */

   130

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

   131

void *visit(library_c *symbol) {return print_list(symbol);}

   132

   133

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

   134

/* B 1.1 - Letters, digits and identifiers */

   135

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

   136

void *visit(identifier_c *symbol) {return print_token(symbol);}

   137

   138

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

   139

/* B 1.2 - Constants */

   140

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

   141

   142

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

   143

/* B 1.2.1 - Numeric Literals */

   144

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

   145

void *visit(real_c *symbol) {return print_token(symbol);}

   146

void *visit(integer_c *symbol) {return print_token(symbol);}

   147

void *visit(binary_integer_c *symbol) {return print_token(symbol);}

   148

void *visit(octal_integer_c *symbol) {return print_token(symbol);}

   149

void *visit(hex_integer_c *symbol) {return print_token(symbol);}

   150

   151

void *visit(numeric_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

   152

void *visit(integer_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

   153

void *visit(real_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

   154

void *visit(bit_string_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

   155

void *visit(boolean_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

   156

   157

/* helper class for boolean_literal_c */

   158

void *visit(boolean_true_c *symbol) {s4o.print(/*"TRUE"*/"1"); return NULL;}

   159

void *visit(boolean_false_c *symbol) {s4o.print(/*"FALSE"*/"0"); return NULL;}

   160

   161

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

   162

/* B.1.2.2   Character Strings */

   163

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

   164

void *visit(double_byte_character_string_c *symbol) {return print_token(symbol);}

   165

void *visit(single_byte_character_string_c *symbol) {return print_token(symbol);}

   166

   167

   168

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

   169

/* B 1.2.3 - Time Literals */

   170

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

   171

   172

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

   173

/* B 1.2.3.1 - Duration */

   174

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

   175

void *visit(neg_time_c *symbol) {s4o.print("-"); return NULL;}

   176

   177

void *visit(duration_c *symbol) {

   178

  s4o.print("TIME#");

   179

  if (symbol->neg != NULL)

   180

    symbol->neg->accept(*this);

   181

  symbol->interval->accept(*this);

   182

  return NULL;

   183

}

   184

   185

void *visit(fixed_point_c *symbol) {return print_token(symbol);}

   186

   187

void *visit(days_c *symbol) {

   188

  symbol->days->accept(*this);

   189

  s4o.print("d");

   190

  if (symbol->hours != NULL)

   191

    symbol->hours->accept(*this);

   192

  return NULL;

   193

}

   194

   195

void *visit(hours_c *symbol) {

   196

  symbol->hours->accept(*this);

   197

  s4o.print("h");

   198

  if (symbol->minutes != NULL)

   199

    symbol->minutes->accept(*this);

   200

  return NULL;

   201

}

   202

   203

void *visit(minutes_c *symbol) {

   204

  symbol->minutes->accept(*this);

   205

  s4o.print("m");

   206

  if (symbol->seconds != NULL)

   207

    symbol->seconds->accept(*this);

   208

  return NULL;

   209

}

   210

   211

void *visit(seconds_c *symbol) {

   212

  symbol->seconds->accept(*this);

   213

  s4o.print("s");

   214

  if (symbol->milliseconds != NULL)

   215

    symbol->milliseconds->accept(*this);

   216

  return NULL;

   217

}

   218

   219

void *visit(milliseconds_c *symbol) {

   220

  symbol->milliseconds->accept(*this);

   221

  s4o.print("ms");

   222

  return NULL;

   223

}

   224

   225

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

   226

/* B 1.2.3.2 - Time of day and Date */

   227

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

   228

   229

void *visit(time_of_day_c *symbol) {

   230

  s4o.print("TIME_OF_DAY#");

   231

  symbol->daytime->accept(*this);

   232

  return NULL;

   233

}

   234

   235

void *visit(daytime_c *symbol) {

   236

  symbol->day_hour->accept(*this);

   237

  s4o.print(":");

   238

  symbol->day_minute->accept(*this);

   239

  s4o.print(":");

   240

  symbol->day_second->accept(*this);

   241

  return NULL;

   242

}

   243

   244

   245

void *visit(date_c *symbol) {

   246

  s4o.print("DATE#");

   247

  symbol->date_literal->accept(*this);

   248

  return NULL;

   249

}

   250

   251

void *visit(date_literal_c *symbol) {

   252

  symbol->year->accept(*this);

   253

  s4o.print("-");

   254

  symbol->month->accept(*this);

   255

  s4o.print("-");

   256

  symbol->day->accept(*this);

   257

  return NULL;

   258

}

   259

   260

void *visit(date_and_time_c *symbol) {

   261

  s4o.print("DATE_AND_TIME#");

   262

  symbol->date_literal->accept(*this);

   263

  s4o.print("-");

   264

  symbol->daytime->accept(*this);

   265

  return NULL;

   266

}

   267

   268

   269

   270

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

   271

/* B 1.3.1 - Elementary Data Types */

   272

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

   273

void *visit(time_type_name_c *symbol) {s4o.print("TIME"); return NULL;}

   274

void *visit(bool_type_name_c *symbol) {s4o.print("BOOL"); return NULL;}

   275

void *visit(sint_type_name_c *symbol) {s4o.print("SINT"); return NULL;}

   276

void *visit(int_type_name_c *symbol) {s4o.print("INT"); return NULL;}

   277

void *visit(dint_type_name_c *symbol) {s4o.print("DINT"); return NULL;}

   278

void *visit(lint_type_name_c *symbol) {s4o.print("LINT"); return NULL;}

   279

void *visit(usint_type_name_c *symbol) {s4o.print("USINT"); return NULL;}

   280

void *visit(uint_type_name_c *symbol) {s4o.print("UINT"); return NULL;}

   281

void *visit(udint_type_name_c *symbol) {s4o.print("UDINT"); return NULL;}

   282

void *visit(ulint_type_name_c *symbol) {s4o.print("ULINT"); return NULL;}

   283

void *visit(real_type_name_c *symbol) {s4o.print("REAL"); return NULL;}

   284

void *visit(lreal_type_name_c *symbol) {s4o.print("LREAL"); return NULL;}

   285

void *visit(date_type_name_c *symbol) {s4o.print("DATE"); return NULL;}

   286

void *visit(tod_type_name_c *symbol) {s4o.print("TOD"); return NULL;}

   287

void *visit(dt_type_name_c *symbol) {s4o.print("DT"); return NULL;}

   288

void *visit(byte_type_name_c *symbol) {s4o.print("BYTE"); return NULL;}

   289

void *visit(word_type_name_c *symbol) {s4o.print("WORD"); return NULL;}

   290

void *visit(lword_type_name_c *symbol) {s4o.print("LWORD"); return NULL;}

   291

void *visit(dword_type_name_c *symbol) {s4o.print("DWORD"); return NULL;}

   292

void *visit(string_type_name_c *symbol) {s4o.print("STRING"); return NULL;}

   293

void *visit(wstring_type_name_c *symbol) {s4o.print("WSTRING"); return NULL;}

   294

   295

   296

   297

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

   298

/* B 1.3.3 - Derived data types */

   299

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

   300

/*  TYPE type_declaration_list END_TYPE */

   301

void *visit(data_type_declaration_c *symbol) {

   302

  s4o.print("TYPE\n");

   303

  s4o.indent_right();

   304

  symbol->type_declaration_list->accept(*this);

   305

  s4o.indent_left();

   306

  s4o.print("END_TYPE\n\n\n");

   307

  return NULL;

   308

}

   309

   310

   311

/* helper symbol for data_type_declaration */

   312

/*| type_declaration_list type_declaration ';' */

   313

void *visit(type_declaration_list_c *symbol) {

   314

  return print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");

   315

}

   316

   317

   318

/*  simple_type_name ':' simple_spec_init */

   319

void *visit(simple_type_declaration_c *symbol) {

   320

  symbol->simple_type_name->accept(*this);

   321

  s4o.print(" : ");

   322

  symbol->simple_spec_init->accept(*this);

   323

  return NULL;

   324

}

   325

   326

/* simple_specification ASSIGN constant */

   327

void *visit(simple_spec_init_c *symbol) {

   328

  symbol->simple_specification->accept(*this);

   329

  if (symbol->constant != NULL) {

   330

    s4o.print(" := ");

   331

    symbol->constant->accept(*this);

   332

  }

   333

  return NULL;

   334

}

   335

   336

/*  subrange_type_name ':' subrange_spec_init */

   337

void *visit(subrange_type_declaration_c *symbol) {

   338

  symbol->subrange_type_name->accept(*this);

   339

  s4o.print(" : ");

   340

  symbol->subrange_spec_init->accept(*this);

   341

  return NULL;

   342

}

   343

   344

/* subrange_specification ASSIGN signed_integer */

   345

void *visit(subrange_spec_init_c *symbol) {

   346

  symbol->subrange_specification->accept(*this);

   347

  if (symbol->signed_integer != NULL) {

   348

    s4o.print(" := ");

   349

    symbol->signed_integer->accept(*this);

   350

  }

   351

  return NULL;

   352

}

   353

   354

/*  integer_type_name '(' subrange')' */

   355

void *visit(subrange_specification_c *symbol) {

   356

  symbol->integer_type_name->accept(*this);

   357

  s4o.print("(");

   358

  symbol->subrange->accept(*this);

   359

  s4o.print(")");

   360

  return NULL;

   361

}

   362

   363

/*  signed_integer DOTDOT signed_integer */

   364

void *visit(subrange_c *symbol) {

   365

  symbol->lower_limit->accept(*this);

   366

  s4o.print(" .. ");

   367

  symbol->upper_limit->accept(*this);

   368

  return NULL;

   369

}

   370

   371

/*  enumerated_type_name ':' enumerated_spec_init */

   372

void *visit(enumerated_type_declaration_c *symbol) {

   373

  symbol->enumerated_type_name->accept(*this);

   374

  s4o.print(" : ");

   375

  symbol->enumerated_spec_init->accept(*this);

   376

  return NULL;

   377

}

   378

   379

/* enumerated_specification ASSIGN enumerated_value */

   380

void *visit(enumerated_spec_init_c *symbol) {

   381

  symbol->enumerated_specification->accept(*this);

   382

  if (symbol->enumerated_value != NULL) {

   383

    s4o.print(" := ");

   384

    symbol->enumerated_value->accept(*this);

   385

  }

   386

  return NULL;

   387

}

   388

   389

/* helper symbol for enumerated_specification->enumerated_spec_init */

   390

/* enumerated_value_list ',' enumerated_value */

   391

void *visit(enumerated_value_list_c *symbol) {print_list(symbol, "(", ", ", ")"); return NULL;}

   392

   393

/* enumerated_type_name '#' identifier */

   394

void *visit(enumerated_value_c *symbol) {

   395

  symbol->type->accept(*this);

   396

  s4o.print("#");

   397

  symbol->value->accept(*this);

   398

  return NULL;

   399

}

   400

   401

/*  identifier ':' array_spec_init */

   402

void *visit(array_type_declaration_c *symbol) {

   403

  symbol->identifier->accept(*this);

   404

  s4o.print(" : ");

   405

  symbol->array_spec_init->accept(*this);

   406

  return NULL;

   407

}

   408

   409

/* array_specification [ASSIGN array_initialization} */

   410

/* array_initialization may be NULL ! */

   411

void *visit(array_spec_init_c *symbol) {

   412

  symbol->array_specification->accept(*this);

   413

  if (symbol->array_initialization != NULL) {

   414

    s4o.print(" := ");

   415

    symbol->array_initialization->accept(*this);

   416

  }

   417

  return NULL;

   418

}

   419

   420

/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */

   421

void *visit(array_specification_c *symbol) {

   422

  s4o.print("ARRAY [");

   423

  symbol->array_subrange_list->accept(*this);

   424

  s4o.print("] OF ");

   425

  symbol->non_generic_type_name->accept(*this);

   426

  return NULL;

   427

}

   428

   429

/* helper symbol for array_specification */

   430

/* array_subrange_list ',' subrange */

   431

void *visit(array_subrange_list_c *symbol) {print_list(symbol, "", ", "); return NULL;}

   432

   433

/* helper symbol for array_initialization */

   434

/* array_initial_elements_list ',' array_initial_elements */

   435

void *visit(array_initial_elements_list_c *symbol) {print_list(symbol, "[", ", ", "]"); return NULL;}

   436

   437

/* integer '(' [array_initial_element] ')' */

   438

/* array_initial_element may be NULL ! */

   439

void *visit(array_initial_elements_c *symbol) {

   440

  symbol->integer->accept(*this);

   441

  s4o.print("(");

   442

  if (symbol->array_initial_element != NULL)

   443

    symbol->array_initial_element->accept(*this);

   444

  s4o.print(")");

   445

  return NULL;

   446

}

   447

   448

/*  structure_type_name ':' structure_specification */

   449

void *visit(structure_type_declaration_c *symbol) {

   450

  symbol->structure_type_name->accept(*this);

   451

  s4o.print(" : ");

   452

  symbol->structure_specification->accept(*this);

   453

  return NULL;

   454

}

   455

   456

/* structure_type_name ASSIGN structure_initialization */

   457

/* structure_initialization may be NULL ! */

   458

void *visit(initialized_structure_c *symbol) {

   459

  symbol->structure_type_name->accept(*this);

   460

  if (symbol->structure_initialization != NULL) {

   461

    s4o.print(" := ");

   462

    symbol->structure_initialization->accept(*this);

   463

  }

   464

  return NULL;

   465

}

   466

   467

/* helper symbol for structure_declaration */

   468

/* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */

   469

/* structure_element_declaration_list structure_element_declaration ';' */

   470

void *visit(structure_element_declaration_list_c *symbol) {

   471

  s4o.print("STRUCT\n");

   472

  s4o.indent_right();

   473

  print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n" + s4o.indent_spaces);

   474

  s4o.print("END_STRUCT");

   475

  s4o.indent_left();

   476

  return NULL;

   477

}

   478

   479

/*  structure_element_name ':' *_spec_init */

   480

void *visit(structure_element_declaration_c *symbol) {

   481

  symbol->structure_element_name->accept(*this);

   482

  s4o.print(" : ");

   483

  symbol->spec_init->accept(*this);

   484

  return NULL;

   485

}

   486

   487

/* helper symbol for structure_initialization */

   488

/* structure_initialization: '(' structure_element_initialization_list ')' */

   489

/* structure_element_initialization_list ',' structure_element_initialization */

   490

void *visit(structure_element_initialization_list_c *symbol) {print_list(symbol, "(", ", ", ")"); return NULL;}

   491

   492

/*  structure_element_name ASSIGN value */

   493

void *visit(structure_element_initialization_c *symbol) {

   494

  symbol->structure_element_name->accept(*this);

   495

  s4o.print(" := ");

   496

  symbol->value->accept(*this);

   497

  return NULL;

   498

}

   499

   500

/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */

   501

void *visit(string_type_declaration_c *symbol) {

   502

  symbol->string_type_name->accept(*this);

   503

  s4o.print(" : ");

   504

  symbol->elementary_string_type_name->accept(*this);

   505

  symbol->string_type_declaration_size->accept(*this);

   506

  if (symbol->string_type_declaration_init != NULL)

   507

    symbol->string_type_declaration_init->accept(*this);

   508

  return NULL;

   509

}

   510

   511

   512

   513

   514

   515

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

   516

/* B 1.4 - Variables */

   517

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

   518

void *visit(symbolic_variable_c *symbol) {

   519

  symbol->var_name->accept(*this);

   520

  return NULL;

   521

}

   522

   523

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

   524

/* B.1.4.1   Directly Represented Variables */

   525

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

   526

void *visit(direct_variable_c *symbol) {return print_token(symbol);}

   527

   528

   529

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

   530