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

    33

/*

    34

 * Seperation of type specification and default value constructs

    35

 * (for e.g. simple_spec_init_c), into a type specificiation part,

    36

 * and a default value part.

    37

 */

    38

    39

#include "spec_init_separator.hh"

    40

#include "../main.hh" // required for ERROR() and ERROR_MSG() macros.

    41

    42

    43

//#define DEBUG

    44

#ifdef DEBUG

    45

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

    46

#else

    47

#define TRACE(classname)

    48

#endif

    49

    50

    51

    52

spec_init_sperator_c *spec_init_sperator_c::get_class_instance(void) {

    53

  if (NULL == class_instance)

    54

    class_instance = new spec_init_sperator_c();

    55

    56

  if (NULL == class_instance)

    57

    ERROR;

    58

    59

  return class_instance;

    60

}

    61

    62

 /* the only two public functions... */

    63

symbol_c *spec_init_sperator_c::get_spec(symbol_c *spec_init) {

    64

   search_what = search_spec;

    65

   return (symbol_c *)spec_init->accept(*get_class_instance());

    66

}

    67

    68

symbol_c *spec_init_sperator_c::get_init(symbol_c *spec_init) {

    69

   search_what = search_init;

    70

   return (symbol_c *)spec_init->accept(*get_class_instance());

    71

}

    72

    73

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

    74

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

    75

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

    76

// SYM_TOKEN(identifier_c)

    77

void *spec_init_sperator_c::visit(identifier_c *symbol) {

    78

  TRACE("spec_init_sperator_c::identifier_c");

    79

  switch (search_what) {

    80

    /* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */

    81

    case search_spec: return symbol;

    82

    case search_init: return NULL;

    83

  }

    84

  ERROR; /* should never occur */

    85

  return NULL;

    86

}

    87

    88

    89

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

    90

/* B 1.3.3 - Derived data types */

    91

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

    92

    93

/* simple_specification ASSIGN constant */

    94

void *spec_init_sperator_c::visit(simple_spec_init_c *symbol) {

    95

  TRACE("spec_init_sperator_c::simple_spec_init_c");

    96

  switch (search_what) {

    97

    case search_spec: return symbol->simple_specification;

    98

    case search_init: return symbol->constant;

    99

  }

   100

  ERROR; /* should never occur */

   101

  return NULL;

   102

}

   103

   104

/* subrange_specification ASSIGN signed_integer */

   105

void *spec_init_sperator_c::visit(subrange_spec_init_c *symbol) {

   106

  TRACE("spec_init_sperator_c::subrange_spec_init_c");

   107

  switch (search_what) {

   108

    case search_spec: return symbol->subrange_specification->accept(*this);

   109

    case search_init: return symbol->signed_integer;

   110

  }

   111

  ERROR; /* should never occur */

   112

  return NULL;

   113

}

   114

   115

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

   116

void *spec_init_sperator_c::visit(subrange_specification_c *symbol) {

   117

  TRACE("spec_init_sperator_c::subrange_specification_c");

   118

  switch (search_what) {

   119

    case search_spec: return symbol->integer_type_name;

   120

    case search_init: return NULL; /* should never occur */

   121

  }

   122

  ERROR; /* should never occur */

   123

  return NULL;

   124

}

   125

   126

/* array_specification [ASSIGN array_initialization} */

   127

/* array_initialization may be NULL ! */

   128

void *spec_init_sperator_c::visit(array_spec_init_c *symbol) {

   129

  TRACE("spec_init_sperator_c::array_spec_init_c");

   130

  switch (search_what) {

   131

    case search_spec: return symbol->array_specification;

   132

    case search_init: return symbol->array_initialization;

   133

  }

   134

  return NULL;

   135

}

   136

   137

/* enumerated_specification ASSIGN enumerated_value */

   138

void *spec_init_sperator_c::visit(enumerated_spec_init_c *symbol) {

   139

  TRACE("spec_init_sperator_c::enumerated_spec_init_c");

   140

  switch (search_what) {

   141

    case search_spec: return symbol->enumerated_specification;

   142

    case search_init: return symbol->enumerated_value;

   143

  }

   144

  ERROR; /* should never occur */

   145

  return NULL;

   146

}

   147

   148

/* structure_type_name ASSIGN structure_initialization */

   149

/* structure_initialization may be NULL ! */

   150

//SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)

   151

void *spec_init_sperator_c::visit(initialized_structure_c *symbol) {

   152

  TRACE("spec_init_sperator_c::initialized_structure_c");

   153

  switch (search_what) {

   154

    case search_spec: return symbol->structure_type_name;

   155

    case search_init: return symbol->structure_initialization;

   156

  }

   157

  ERROR; /* should never occur */

   158

  return NULL;

   159

}

   160

   161

   162

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

   163

/* B 1.4.3 - Declaration & Initialisation */

   164

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

   165

   166

/* fb_name_list ':' function_block_type_name ASSIGN structure_initialization */

   167

/* structure_initialization -> may be NULL ! */

   168

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

   169

  TRACE("spec_init_sperator_c::fb_name_decl_c");

   170

  switch (search_what) {

   171

    case search_spec: return symbol->function_block_type_name;

   172

    case search_init: return symbol->structure_initialization;

   173

  }

   174

  ERROR; /* should never occur */

   175

  return NULL;

   176

}

   177

   178

   179

/* STRING '[' integer ']' 

   180

 * STRING ASSIGN single_byte_character_string

   181

 * STRING '[' integer ']' ASSIGN single_byte_character_string

   182

 */

   183

void *spec_init_sperator_c::visit(single_byte_string_spec_c *symbol) {

   184

  TRACE("spec_init_sperator_c::single_byte_string_spec_c");

   185

  switch (search_what) {

   186

    case search_spec: return symbol->string_spec;

   187

    case search_init: return symbol->single_byte_character_string;

   188

  }

   189

  ERROR; /* should never occur */

   190

  return NULL;

   191

}

   192

   193

/* WSTRING '[' integer ']' 

   194

 * WSTRING ASSIGN double_byte_character_string

   195

 * WSTRING '[' integer ']' ASSIGN double_byte_character_string

   196

 */

   197

void *spec_init_sperator_c::visit(double_byte_string_spec_c *symbol) {

   198

  TRACE("spec_init_sperator_c::double_byte_string_spec_c");

   199

  switch (search_what) {

   200

    case search_spec: return symbol->string_spec;

   201

    case search_init: return symbol->double_byte_character_string;

   202

  }

   203

  ERROR; /* should never occur */

   204

  return NULL;

   205

}

   206

   207

   208

spec_init_sperator_c *spec_init_sperator_c ::class_instance = NULL;

   209

spec_init_sperator_c::search_what_t spec_init_sperator_c::search_what;