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)

     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

/* Determine the data type of a specific constant or variable.

    34

 * A reference to the relevant type definition is returned.

    35

 *

    36

 * For example:

    37

 *       22          -> returns reference to a int_type_name_c object.

    38

 *       22.2        -> returns reference to a real_type_name_c object.

    39

 *       LREAL#22.2  -> returns reference to a lreal_type_name_c object.

    40

 *       etc...

    41

 */

    42

    43

    44

#include "search_constant_type.hh"

    45

    46

#define ERROR error_exit(__FILE__,__LINE__)

    47

/* function defined in main.cc */

    48

extern void error_exit(const char *file_name, int line_no);

    49

    50

symbol_c *search_constant_type_c::get_type(symbol_c *constant) {

    51

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

    52

}

    53

    54

    55

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

    56

/* B 1.2 - Constants */

    57

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

    58

    59

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

    60

/* B 1.2.1 - Numeric Literals */

    61

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

    62

/* Numeric literals without any explicit type cast have unknown data type, 

    63

  * so we continue considering them as their own basic data types until

    64

  * they can be resolved (for example, when using '30+x' where 'x' is a LINT variable, the

    65

  * numeric literal '30' must then be considered a LINT so the ADD function may be called

    66

  * with all inputs of the same data type.

    67

  * If 'x' were a SINT, then the '30' would have to be a SINT too!

    68

  */

    69

void *search_constant_type_c::visit(real_c *symbol)           {return (void *)symbol;}

    70

void *search_constant_type_c::visit(neg_real_c *symbol)       {return (void *)symbol;}

    71

void *search_constant_type_c::visit(integer_c *symbol)        {return (void *)symbol;}

    72

void *search_constant_type_c::visit(neg_integer_c *symbol)    {return (void *)symbol;}

    73

void *search_constant_type_c::visit(binary_integer_c *symbol) {return (void *)symbol;}

    74

void *search_constant_type_c::visit(octal_integer_c *symbol)  {return (void *)symbol;}

    75

void *search_constant_type_c::visit(hex_integer_c *symbol)    {return (void *)symbol;}

    76

    77

void *search_constant_type_c::visit(integer_literal_c *symbol)

    78

  {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

    79

void *search_constant_type_c::visit(real_literal_c *symbol)

    80

  {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

    81

void *search_constant_type_c::visit(bit_string_literal_c *symbol)

    82

  {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

    83

void *search_constant_type_c::visit(boolean_literal_c *symbol)

    84

  {return (void *)((symbol->type!=NULL)?symbol->type:symbol->value->accept(*this));}

    85

    86

void *search_constant_type_c::visit(boolean_true_c *symbol)   {return (void *)symbol;}

    87

void *search_constant_type_c::visit(boolean_false_c *symbol)  {return (void *)symbol;}

    88

    89

    90

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

    91

/* B.1.2.2   Character Strings */

    92

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

    93

void *search_constant_type_c::visit(double_byte_character_string_c *symbol) {return (void *)&wstring_type_name;}

    94

void *search_constant_type_c::visit(single_byte_character_string_c *symbol) {return (void *)&string_type_name;}

    95

    96

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

    97

/* B 1.2.3 - Time Literals */

    98

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

    99

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

   100

/* B 1.2.3.1 - Duration */

   101

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

   102

void *search_constant_type_c::visit(neg_time_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

   103

void *search_constant_type_c::visit(duration_c *symbol) {return (void *)(symbol->type_name);}

   104

void *search_constant_type_c::visit(fixed_point_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

   105

void *search_constant_type_c::visit(days_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

   106

void *search_constant_type_c::visit(hours_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

   107

void *search_constant_type_c::visit(minutes_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

   108

void *search_constant_type_c::visit(seconds_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

   109

void *search_constant_type_c::visit(milliseconds_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

   110

   111

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

   112

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

   113

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

   114

void *search_constant_type_c::visit(time_of_day_c *symbol) {return (void *)(symbol->type_name);}

   115

void *search_constant_type_c::visit(daytime_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

   116

void *search_constant_type_c::visit(date_c *symbol) {return (void *)(symbol->type_name);}

   117

void *search_constant_type_c::visit(date_literal_c *symbol) {ERROR; return NULL;}  /* this member function should never be called. */

   118

void *search_constant_type_c::visit(date_and_time_c *symbol) {return (void *)(symbol->type_name);}

   119

   120

   121

real_type_name_c     search_constant_type_c::real_type_name;

   122

sint_type_name_c     search_constant_type_c::sint_type_name;

   123

lint_type_name_c     search_constant_type_c::lint_type_name;

   124

dint_type_name_c     search_constant_type_c::dint_type_name;

   125

date_type_name_c     search_constant_type_c::date_type_name;

   126

dword_type_name_c    search_constant_type_c::dword_type_name;

   127

dt_type_name_c       search_constant_type_c::dt_type_name;

   128

tod_type_name_c      search_constant_type_c::tod_type_name;

   129

udint_type_name_c    search_constant_type_c::udint_type_name;

   130

word_type_name_c     search_constant_type_c::word_type_name;

   131

wstring_type_name_c  search_constant_type_c::wstring_type_name;

   132

string_type_name_c   search_constant_type_c::string_type_name;

   133

lword_type_name_c    search_constant_type_c::lword_type_name;

   134

uint_type_name_c     search_constant_type_c::uint_type_name;

   135

lreal_type_name_c    search_constant_type_c::lreal_type_name;

   136

byte_type_name_c     search_constant_type_c::byte_type_name;

   137

usint_type_name_c    search_constant_type_c::usint_type_name;

   138

ulint_type_name_c    search_constant_type_c::ulint_type_name;

   139

bool_type_name_c     search_constant_type_c::bool_type_name;

   140

time_type_name_c     search_constant_type_c::time_type_name;

   141

int_type_name_c      search_constant_type_c::int_type_name;

   142

   143

// safebool_type_name_c    search_constant_type_c::safebool_type_name;

   144

  /* The following is required because the expression (TOD_var - TOD_var) will result in a data type

   145

   *  (in this case, TIME) that is neither of the expression elements...

   146

   */

   147

safetime_type_name_c     search_constant_type_c::safetime_type_name;

   148

safetod_type_name_c      search_constant_type_c::safetod_type_name;

   149

safedt_type_name_c       search_constant_type_c::safedt_type_name;

   150

   151

   152

   153

/* temporarily here until we remove the st_code_gen.c and il_code_gen.c files... */

   154

/* It should then move to search_expression_type_c                               */

   155

integer_c search_constant_type_c::integer("1");