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

/* 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 "../util/symtable.hh"

    45

#include "search_constant_type.hh"

    46

    47

/* A symbol table with all values declared for enumerated type... */

    48

/* Note that if the value is defined multiple times the value

    49

 * is the null pointer.

    50

 */

    51

extern symbol_c null_symbol4;

    52

extern symtable_c<symbol_c *, &null_symbol4> enumerated_value_symtable;

    53

    54

#define ERROR error_exit(__FILE__,__LINE__)

    55

/* function defined in main.cc */

    56

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

    57

    58

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

    59

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

    60

}

    61

    62

    63

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

    64

/* B 1.2 - Constants */

    65

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

    66

    67

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

    68

/* B 1.2.1 - Numeric Literals */

    69

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

    70

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

    71

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

    72

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

    73

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

    74

  * with all inputs of the same data type.

    75

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

    76

  */

    77

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

    78

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

    79

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

    80

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

    81

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

    82

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

    83

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

    84

    85

void *search_constant_type_c::visit(integer_literal_c *symbol)

    86

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

    87

void *search_constant_type_c::visit(real_literal_c *symbol)

    88

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

    89

void *search_constant_type_c::visit(bit_string_literal_c *symbol)

    90

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

    91

void *search_constant_type_c::visit(boolean_literal_c *symbol)

    92

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

    93

    94

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

    95

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

    96

    97

    98

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

    99

/* B.1.2.2   Character Strings */

   100

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

   101

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

   102

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

   103

   104

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

   105

/* B 1.2.3 - Time Literals */

   106

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

   107

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

   108

/* B 1.2.3.1 - Duration */

   109

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

   110

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

   111

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

   112

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

   113

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

   114

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

   115

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

   116

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

   117

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

   118

   119

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

   120

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

   121

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

   122

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

   123

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

   124

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

   125

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

   126

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

   127

   128

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

   129

/* B 1.3.3 - Derived data types */

   130

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

   131

void *search_constant_type_c::visit(enumerated_value_c *symbol) {

   132

	if (symbol->type != NULL)

   133

		return (void *)(symbol->type);

   134

   135

	symbol_c *value_type = enumerated_value_symtable.find_value(symbol->value);

   136

	if (value_type == enumerated_value_symtable.end_value()) ERROR;

   137

   138

	return (void *)value_type;

   139

}

   140

   141

real_type_name_c     search_constant_type_c::real_type_name;

   142

sint_type_name_c     search_constant_type_c::sint_type_name;

   143

lint_type_name_c     search_constant_type_c::lint_type_name;

   144

dint_type_name_c     search_constant_type_c::dint_type_name;

   145

date_type_name_c     search_constant_type_c::date_type_name;

   146

dword_type_name_c    search_constant_type_c::dword_type_name;

   147

dt_type_name_c       search_constant_type_c::dt_type_name;

   148

tod_type_name_c      search_constant_type_c::tod_type_name;

   149

udint_type_name_c    search_constant_type_c::udint_type_name;

   150

word_type_name_c     search_constant_type_c::word_type_name;

   151

wstring_type_name_c  search_constant_type_c::wstring_type_name;

   152

string_type_name_c   search_constant_type_c::string_type_name;

   153

lword_type_name_c    search_constant_type_c::lword_type_name;

   154

uint_type_name_c     search_constant_type_c::uint_type_name;

   155

lreal_type_name_c    search_constant_type_c::lreal_type_name;

   156

byte_type_name_c     search_constant_type_c::byte_type_name;

   157

usint_type_name_c    search_constant_type_c::usint_type_name;

   158

ulint_type_name_c    search_constant_type_c::ulint_type_name;

   159

bool_type_name_c     search_constant_type_c::bool_type_name;

   160

time_type_name_c     search_constant_type_c::time_type_name;

   161

int_type_name_c      search_constant_type_c::int_type_name;

   162

   163

// safebool_type_name_c    search_constant_type_c::safebool_type_name;

   164

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

   165

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

   166

   */

   167

safetime_type_name_c     search_constant_type_c::safetime_type_name;

   168

safetod_type_name_c      search_constant_type_c::safetod_type_name;

   169

safedt_type_name_c       search_constant_type_c::safedt_type_name;

   170

   171

   172

   173

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

   174

/* It should then move to search_expression_type_c                               */

   175

integer_c search_constant_type_c::integer("1");