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

/* Determine the data type on which another data type is based on.

    27

 * If a new default initial value is given, we DO NOT consider it a

    28

 * new base class, and continue looking further!

    29

 *

    30

 * E.g. TYPE new_int_t : INT; END_TYPE;

    31

 *      TYPE new_int2_t : INT = 2; END_TYPE;

    32

 *      TYPE new_subr_t : INT (4..5); END_TYPE;

    33

 *

    34

 *    new_int_t is really an INT!!

    35

 *    new_int2_t is also really an INT!!

    36

 *    new_subr_t is also really an INT!!

    37

 */

    38

    39

    40

class search_base_type_c: public null_visitor_c {

    41

    42

  private:

    43

    symbol_c *current_type_name;

    44

    bool is_subrange;

    45

    bool is_enumerated;

    46

    47

  public:

    48

    search_base_type_c(void);

    49

    50

  public:

    51

    void *visit(identifier_c *type_name);

    52

    bool type_is_subrange(symbol_c* type_decl);

    53

    bool type_is_enumerated(symbol_c* type_decl);

    54

    55

  public:

    56

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

    57

  /* B 1.3.1 - Elementary Data Types */

    58

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

    59

    void *visit(time_type_name_c *symbol);

    60

    void *visit(bool_type_name_c *symbol);

    61

    void *visit(sint_type_name_c *symbol);

    62

    void *visit(int_type_name_c *symbol);

    63

    void *visit(dint_type_name_c *symbol);

    64

    void *visit(lint_type_name_c *symbol);

    65

    void *visit(usint_type_name_c *symbol);

    66

    void *visit(uint_type_name_c *symbol);

    67

    void *visit(udint_type_name_c *symbol);

    68

    void *visit(ulint_type_name_c *symbol);

    69

    void *visit(real_type_name_c *symbol);

    70

    void *visit(lreal_type_name_c *symbol);

    71

    void *visit(date_type_name_c *symbol);

    72

    void *visit(tod_type_name_c *symbol);

    73

    void *visit(dt_type_name_c *symbol)	;

    74

    void *visit(byte_type_name_c *symbol);

    75

    void *visit(word_type_name_c *symbol);

    76

    void *visit(dword_type_name_c *symbol);

    77

    void *visit(lword_type_name_c *symbol);

    78

    void *visit(string_type_name_c *symbol);

    79

    void *visit(wstring_type_name_c *symbol);

    80

    void *visit(constant_int_type_name_c *symbol);

    81

    void *visit(constant_real_type_name_c *symbol);

    82

    83

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

    84

    /* Extensions to the base standard as defined in      */

    85

    /* "Safety Software Technical Specification,          */

    86

    /*  Part 1: Concepts and Function Blocks,             */

    87

    /*  Version 1.0 – Official Release"                   */

    88

    /* by PLCopen - Technical Committee 5 - 2006-01-31    */

    89

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

    90

    void *visit(safebool_type_name_c *symbol);

    91

    92

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

    93

  /* B 1.3.3 - Derived data types */

    94

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

    95

  /*  simple_type_name ':' simple_spec_init */

    96

    void *visit(simple_type_declaration_c *symbol);

    97

  /* simple_specification ASSIGN constant */

    98

    void *visit(simple_spec_init_c *symbol);

    99

  /*  subrange_type_name ':' subrange_spec_init */

   100

    void *visit(subrange_type_declaration_c *symbol);

   101

  /* subrange_specification ASSIGN signed_integer */

   102

    void *visit(subrange_spec_init_c *symbol);

   103

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

   104

    void *visit(subrange_specification_c *symbol);

   105

  /*  signed_integer DOTDOT signed_integer */

   106

    void *visit(subrange_c *symbol);

   107

   108

  /*  enumerated_type_name ':' enumerated_spec_init */

   109

    void *visit(enumerated_type_declaration_c *symbol);

   110

  /* enumerated_specification ASSIGN enumerated_value */

   111

    void *visit(enumerated_spec_init_c *symbol);

   112

  /* helper symbol for enumerated_specification->enumerated_spec_init */

   113

  /* enumerated_value_list ',' enumerated_value */

   114

    void *visit(enumerated_value_list_c *symbol);

   115

  /* enumerated_type_name '#' identifier */

   116

  // SYM_REF2(enumerated_value_c, type, value)

   117

    void *visit(enumerated_value_c *symbol);

   118

  /*  identifier ':' array_spec_init */

   119

    void *visit(array_type_declaration_c *symbol);

   120

  /* array_specification [ASSIGN array_initialization} */

   121

  /* array_initialization may be NULL ! */

   122

    void *visit(array_spec_init_c *symbol);

   123

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

   124

    void *visit(array_specification_c *symbol);

   125

  /* helper symbol for array_specification */

   126

  /* array_subrange_list ',' subrange */

   127

    void *visit(array_subrange_list_c *symbol);

   128

  /* array_initialization:  '[' array_initial_elements_list ']' */

   129

  /* helper symbol for array_initialization */

   130

  /* array_initial_elements_list ',' array_initial_elements */

   131

    void *visit(array_initial_elements_list_c *symbol);

   132

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

   133

  /* array_initial_element may be NULL ! */

   134

    void *visit(array_initial_elements_c *symbol);

   135

  /*  structure_type_name ':' structure_specification */

   136

      /* NOTE: structure_specification will point to either a

   137

       *       initialized_structure_c

   138

       *       OR A

   139

       *       structure_element_declaration_list_c

   140

       */

   141

    void *visit(structure_type_declaration_c *symbol);

   142

  /* structure_type_name ASSIGN structure_initialization */

   143

  /* structure_initialization may be NULL ! */

   144

    void *visit(initialized_structure_c *symbol);

   145

  /* helper symbol for structure_declaration */

   146

  /* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */

   147

  /* structure_element_declaration_list structure_element_declaration ';' */

   148

    void *visit(structure_element_declaration_list_c *symbol);

   149

  /*  structure_element_name ':' *_spec_init */

   150

    void *visit(structure_element_declaration_c *symbol);

   151

  /* helper symbol for structure_initialization */

   152

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

   153

  /* structure_element_initialization_list ',' structure_element_initialization */

   154

    void *visit(structure_element_initialization_list_c *symbol);

   155

  /*  structure_element_name ASSIGN value */

   156

    void *visit(structure_element_initialization_c *symbol);

   157

  /*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */

   158

  /*

   159

  SYM_REF4(string_type_declaration_c,	string_type_name,

   160

  					elementary_string_type_name,

   161

  					string_type_declaration_size,

   162

  					string_type_declaration_init) // may be == NULL!

   163

  */

   164

    void *visit(string_type_declaration_c *symbol);

   165

}; // search_base_type_c

   166

   167

   168

   169