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 <sstream>

    46

#include "generate_iec.hh"

    47

    48

#include "../stage4.hh"

    49

    50

    51

    52

    53

    54

    55

//class generate_iec_c: public iterator_visitor_c {

    56

class generate_iec_c: public visitor_c {

    57

  private:

    58

    stage4out_c &s4o;

    59

    60

    61

  public:

    62

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

    63

    ~generate_iec_c(void) {}

    64

    65

    66

  private:

    67

    68

void *print_token(token_c *token) {

    69

  return s4o.print(token->value);

    70

}

    71

    72

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

    73

  type->accept(*this);

    74

  s4o.print("#");

    75

  value->accept(*this);

    76

  return NULL;

    77

}

    78

    79

void *print_list(list_c *list,

    80

			       std::string pre_elem_str = "",

    81

			       std::string inter_elem_str = "",

    82

			       std::string post_elem_str = "") {

    83

  if (list->n > 0) {

    84

    s4o.print(pre_elem_str);

    85

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

    86

  }

    87

    88

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

    89

    s4o.print(inter_elem_str);

    90

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

    91

  }

    92

    93

  if (list->n > 0)

    94

    s4o.print(post_elem_str);

    95

    96

  return NULL;

    97

}

    98

    99

   100

void *print_binary_expression(symbol_c *l_exp,

   101

			      symbol_c *r_exp,

   102

			      const char *operation) {

   103

  s4o.print("(");

   104

  l_exp->accept(*this);

   105

  s4o.print(operation);

   106

  r_exp->accept(*this);

   107

  s4o.print(")");

   108

  return NULL;

   109

}

   110

   111

void *print_unary_expression(symbol_c *exp,

   112

			     const char *operation) {

   113

  s4o.print(operation);

   114

  exp->accept(*this);

   115

  return NULL;

   116

}

   117

   118

   119

   120

   121

   122

  public:

   123

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

   124

/* 2.1.6 Pragmas */

   125

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

   126

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

   127

   128

   129

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

   130

/* B 0 - Programming Model */

   131

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

   132

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

   133

   134

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

   135

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

   136

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

   137

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

   138

   139

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

   140

/* B 1.2 - Constants */

   141

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

   142

   143

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

   144

/* B 1.2.1 - Numeric Literals */

   145

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

   146

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

   147

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

   148

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

   149

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

   150

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

   151

   152

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

   153

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

   154

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

   155

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

   156

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

   157

   158

/* helper class for boolean_literal_c */

   159

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

   160

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

   161

   162

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

   163

/* B.1.2.2   Character Strings */

   164

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

   165

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

   166

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

   167

   168

   169

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

   170

/* B 1.2.3 - Time Literals */

   171

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

   172

   173

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

   174

/* B 1.2.3.1 - Duration */

   175

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

   176

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

   177

   178

void *visit(duration_c *symbol) {

   179

  s4o.print("TIME#");

   180

  if (symbol->neg != NULL)

   181

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

   182

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

   183

  return NULL;

   184

}

   185

   186

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

   187

   188

void *visit(days_c *symbol) {

   189

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

   190

  s4o.print("d");

   191

  if (symbol->hours != NULL)

   192

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

   193

  return NULL;

   194

}

   195

   196

void *visit(hours_c *symbol) {

   197

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

   198

  s4o.print("h");

   199

  if (symbol->minutes != NULL)

   200

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

   201

  return NULL;

   202

}

   203

   204

void *visit(minutes_c *symbol) {

   205

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

   206

  s4o.print("m");

   207

  if (symbol->seconds != NULL)

   208

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

   209

  return NULL;

   210

}

   211

   212

void *visit(seconds_c *symbol) {

   213

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

   214

  s4o.print("s");

   215

  if (symbol->milliseconds != NULL)

   216

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

   217

  return NULL;

   218

}

   219

   220

void *visit(milliseconds_c *symbol) {

   221

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

   222

  s4o.print("ms");

   223

  return NULL;

   224

}

   225

   226

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

   227

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

   228

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

   229

   230

void *visit(time_of_day_c *symbol) {

   231

  s4o.print("TIME_OF_DAY#");

   232

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

   233

  return NULL;

   234

}

   235

   236

void *visit(daytime_c *symbol) {

   237

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

   238

  s4o.print(":");

   239

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

   240

  s4o.print(":");

   241

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

   242

  return NULL;

   243

}

   244

   245

   246

void *visit(date_c *symbol) {

   247

  s4o.print("DATE#");

   248

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

   249

  return NULL;

   250

}

   251

   252

void *visit(date_literal_c *symbol) {

   253

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

   254

  s4o.print("-");

   255

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

   256

  s4o.print("-");

   257

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

   258

  return NULL;

   259

}

   260

   261

void *visit(date_and_time_c *symbol) {

   262

  s4o.print("DATE_AND_TIME#");

   263

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

   264

  s4o.print("-");

   265

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

   266

  return NULL;

   267

}

   268

   269

   270

   271

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

   272

/* B 1.3.1 - Elementary Data Types */

   273

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

   274

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

   275

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

   276

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

   277

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

   278

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

   279

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

   280

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

   281

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

   282

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

   283

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

   284

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

   285

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

   286

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

   287

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

   288

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

   289

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

   290

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

   291

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

   292

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

   293

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

   294

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

   295

void *visit(constant_int_type_name_c *symbol) {return NULL;}

   296

void *visit(constant_real_type_name_c *symbol) {return NULL;}

   297

   298

   299

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

   300

/* B 1.3.3 - Derived data types */

   301

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

   302

/*  TYPE type_declaration_list END_TYPE */

   303

void *visit(data_type_declaration_c *symbol) {

   304

  s4o.print("TYPE\n");

   305

  s4o.indent_right();

   306

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

   307

  s4o.indent_left();

   308

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

   309

  return NULL;

   310

}

   311

   312

   313

/* helper symbol for data_type_declaration */

   314

/*| type_declaration_list type_declaration ';' */

   315

void *visit(type_declaration_list_c *symbol) {

   316

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

   317

}

   318

   319

   320

/*  simple_type_name ':' simple_spec_init */

   321

void *visit(simple_type_declaration_c *symbol) {

   322

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

   323

  s4o.print(" : ");

   324

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

   325

  return NULL;

   326

}

   327

   328

/* simple_specification ASSIGN constant */

   329

void *visit(simple_spec_init_c *symbol) {

   330

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

   331

  if (symbol->constant != NULL) {

   332

    s4o.print(" := ");

   333

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

   334

  }

   335

  return NULL;

   336

}

   337

   338

/*  subrange_type_name ':' subrange_spec_init */

   339

void *visit(subrange_type_declaration_c *symbol) {

   340

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

   341

  s4o.print(" : ");

   342

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

   343

  return NULL;

   344

}

   345

   346

/* subrange_specification ASSIGN signed_integer */

   347

void *visit(subrange_spec_init_c *symbol) {

   348

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

   349

  if (symbol->signed_integer != NULL) {

   350

    s4o.print(" := ");

   351

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

   352

  }

   353

  return NULL;

   354

}

   355

   356

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

   357

void *visit(subrange_specification_c *symbol) {

   358

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

   364

  return NULL;

   365

}

   366

   367

/*  signed_integer DOTDOT signed_integer */

   368

void *visit(subrange_c *symbol) {

   369

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

   370

  s4o.print(" .. ");

   371

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

   372

  return NULL;

   373

}

   374

   375

/*  enumerated_type_name ':' enumerated_spec_init */

   376

void *visit(enumerated_type_declaration_c *symbol) {

   377

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

   378

  s4o.print(" : ");

   379

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

   380

  return NULL;

   381

}

   382

   383

/* enumerated_specification ASSIGN enumerated_value */

   384

void *visit(enumerated_spec_init_c *symbol) {

   385

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

   386

  if (symbol->enumerated_value != NULL) {

   387

    s4o.print(" := ");

   388

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

   389

  }

   390

  return NULL;

   391

}

   392

   393

/* helper symbol for enumerated_specification->enumerated_spec_init */

   394

/* enumerated_value_list ',' enumerated_value */

   395

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

   396

   397

/* enumerated_type_name '#' identifier */

   398

void *visit(enumerated_value_c *symbol) {

   399

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

   400

  s4o.print("#");

   401

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

   402

  return NULL;

   403

}

   404

   405

/*  identifier ':' array_spec_init */

   406

void *visit(array_type_declaration_c *symbol) {

   407

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

   408

  s4o.print(" : ");

   409

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

   410

  return NULL;

   411

}

   412

   413

/* array_specification [ASSIGN array_initialization} */

   414

/* array_initialization may be NULL ! */

   415

void *visit(array_spec_init_c *symbol) {

   416

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

   417

  if (symbol->array_initialization != NULL) {

   418

    s4o.print(" := ");

   419

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

   420

  }

   421

  return NULL;

   422

}

   423

   424

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

   425

void *visit(array_specification_c *symbol) {

   426

  s4o.print("ARRAY [");

   427

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

   428

  s4o.print("] OF ");

   429

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

   430

  return NULL;

   431

}

   432

   433

/* helper symbol for array_specification */

   434

/* array_subrange_list ',' subrange */

   435

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

   436

   437

/* helper symbol for array_initialization */

   438

/* array_initial_elements_list ',' array_initial_elements */

   439

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

   440

   441

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

   442

/* array_initial_element may be NULL ! */

   443

void *visit(array_initial_elements_c *symbol) {

   444

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

   445

  s4o.print("(");

   446

  if (symbol->array_initial_element != NULL)

   447

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

   448

  s4o.print(")");

   449

  return NULL;

   450

}

   451

   452

/*  structure_type_name ':' structure_specification */

   453

void *visit(structure_type_declaration_c *symbol) {

   454

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

   455

  s4o.print(" : ");

   456

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

   457

  return NULL;

   458

}

   459

   460

/* structure_type_name ASSIGN structure_initialization */

   461

/* structure_initialization may be NULL ! */

   462

void *visit(initialized_structure_c *symbol) {

   463

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

   464

  if (symbol->structure_initialization != NULL) {

   465

    s4o.print(" := ");

   466

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

   467

  }

   468

  return NULL;

   469

}

   470

   471

/* helper symbol for structure_declaration */

   472

/* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */

   473

/* structure_element_declaration_list structure_element_declaration ';' */

   474

void *visit(structure_element_declaration_list_c *symbol) {

   475

  s4o.print("STRUCT\n");

   476

  s4o.indent_right();

   477

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

   478

  s4o.print("END_STRUCT");

   479

  s4o.indent_left();

   480

  return NULL;

   481

}

   482

   483

/*  structure_element_name ':' *_spec_init */

   484

void *visit(structure_element_declaration_c *symbol) {

   485

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

   486

  s4o.print(" : ");

   487

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

   488

  return NULL;

   489

}

   490

   491

/* helper symbol for structure_initialization */

   492

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

   493

/* structure_element_initialization_list ',' structure_element_initialization */

   494

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

   495

   496

/*  structure_element_name ASSIGN value */

   497

void *visit(structure_element_initialization_c *symbol) {

   498

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

   499

  s4o.print(" := ");

   500

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

   501

  return NULL;

   502

}

   503

   504

/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */

   505

void *visit(string_type_declaration_c *symbol) {

   506

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

   507

  s4o.print(" : ");

   508

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

   509

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

   510

  if (symbol->string_type_declaration_init != NULL)

   511

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

   512

  return NULL;

   513

}

   514

   515

   516

   517

   518

   519

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

   520

/* B 1.4 - Variables */

   521

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

   522

void *visit(symbolic_variable_c *symbol) {

   523

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

   524

  return NULL;

   525

}

   526

   527

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

   528

/* B.1.4.1   Directly Represented Variables */