/*
* (c) 2003 Mario de Sousa
*
* Offered to the public under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* This code is made available on the understanding that it will not be
* used in safety-critical situations without a full and competent review.
*/
/*
* An IEC 61131-3 IL and ST compiler.
*
* Based on the
* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
*
*/
/* Determine the size, in bits, of the data type.
*
* NOTE: Currently, only elementary data types with well defined sizes (in the standard) are supported.
* - derived data types are not supported, and these will return 0
* - TIME, DATE, TIME_OF_DAY, and DATE_AND_TIME are not supported, and will return 0
* - STRING and WSTRING are not supported, and the standard merely defines bit per character,
* and not the maximum number of characters, so these will return 0
*
* We also support the 'Numeric Literals' Data types.
* i.e., numeric literals are considerd basic data types
* as their data type is undefined (e.g. the datat type of '30'
* could be 'INT' or 'SINT' or 'LINT' or 'USINT' or ...
* NOTE: for base 10 numeric literals, any number taking up more than 64 bits
* will only return a bitsize of 1024!
*
* For numeric literals, we return the minimum number of bits
* required to store the value.
*
* E.g. TYPE new_int_t : INT; END_TYPE;
* TYPE new_int2_t : INT = 2; END_TYPE;
* TYPE new_subr_t : INT (4..5); END_TYPE;
*
* sizeof(SINT) -> 8
* sizeof(INT) -> 16
* sizeof(DINT) -> 32
* sizeof(LINT) -> 64
*
* sizeof('1') -> 1
* sizeof('015') -> 4 # Leading zeros are ignored!
* sizeof('0') -> 1 # This is a special case! Even the value 0 needs at least 1 bit to store!
* sizeof('16') -> 5
* sizeof('2#00101') -> 3
* sizeof('8#334') -> 9
* sizeof('16#2A') -> 8
*
* sizeof('7.4') -> 32 # all real literals return 32 bits, the size of a 'REAL'
* # TODO: study IEC 60559 for the range of values that may be
* # stored in a REAL (basic single width floating point format)
* # and in a LREAL (basic double width floating point format)
* # and see if some real literals need to return 64 instead!
*/
#include "get_sizeof_datatype.hh"
#include <stdlib.h>
#include <string.h>
#include <limits.h> // get definition of ULLONG_MAX
/* tell stdint.h we want the definition of UINT64_MAX */
#define __STDC_LIMIT_MACROS
#include <stdint.h> // get definition of uint64_t and UINT64_MAX
#define ERROR error_exit(__FILE__,__LINE__)
/* function defined in main.cc */
extern void error_exit(const char *file_name, int line_no);
/* This class is a singleton.
* So we need a pointer to the singe instance...
*/
get_sizeof_datatype_c *get_sizeof_datatype_c::singleton = NULL;
#define _encode_int(value) ((void *)(((char *)NULL) + value))
#define _decode_int(ptr) (((char *)ptr) - ((char *)NULL))
/* divide a base 10 literal in a string by 2 */
/* returns remainder of division (0 or 1) */
static int strdivby2(char **strptr) {
char *str = *strptr;
int carry = 0;
while (*str != '\0') {
/* Assumes ASCII */
int newcarry;
// newcarry = ((*str-'0') mod 2);
newcarry = ((*str-'0') - ((*str-'0')/2)*2);
*str = (((*str-'0') + 10*carry)/2) + '0';
carry = newcarry;
str++;
}
/* ignore leading zeros in result... */
while (**strptr == '0')
(*strptr)++;
return carry;
}
/* Constructor for the singleton class */
int get_sizeof_datatype_c::getsize(symbol_c *data_type_symbol) {
if (NULL == singleton) {
singleton = new get_sizeof_datatype_c;
if (NULL == singleton)
ERROR;
}
return _decode_int(data_type_symbol->accept(*singleton));
}
/* Destructor for the singleton class */
get_sizeof_datatype_c::~get_sizeof_datatype_c(void) {
if (NULL != singleton) delete singleton;
singleton = NULL;
}
/*********************/
/* B 1.2 - Constants */
/*********************/
/******************************/
/* B 1.2.1 - Numeric Literals */
/******************************/
/* Numeric literals without any explicit type cast have unknown data type,
* so we continue considering them as their own basic data types until
* they can be resolved (for example, when using '30+x' where 'x' is a LINT variable, the
* numeric literal '30' must then be considered a LINT so the ADD function may be called
* with all inputs of the same data type.
* If 'x' were a SINT, then the '30' would have to be a SINT too!
*/
/* NOTE: all integer and real literal tokens will always be positive (i.e. no leading '-')
* due to the way the source code is parsed by iec.flex.
*/
void *get_sizeof_datatype_c::visit(real_c *symbol) {
return _encode_int(32);
}
/* NOTE: all integer and real literal tokens will always be positive (i.e. no leading '-')
* due to the way the source code is parsed by iec.flex.
*/
void *get_sizeof_datatype_c::visit(integer_c *symbol) {
int bitsize = 0;
if (NULL == symbol->value ) ERROR;
if ('\0' == *(symbol->value)) ERROR;
#if 0
char *endptr;
/* Convert the string to an unsigned 64 bit integer */
/* We can use strtoull(), but we are not guaranteed that an unsigned long long int
* is 64 bits wide. First make sure that it is...
*
* We could also use the strtouq() instead, which converts
* to a quad word (64 bits). However, this requires either GCC or BSD extensions.
*/
#ifdef strtoull // this ifdef does not work!!
/* we have long long int, use it... */
#define ival_MAX ULLONG_MAX
unsigned long long int ival = 0;
ival = strtoull (symbol->value, &endptr, 10 /* base */);
#else
/* use long int ... */
#define ival_MAX ULONG_MAX
unsigned long int ival = 0;
ival = strtoul (symbol->value, &endptr, 10 /* base */);
#endif
#if (ival_MAX < UINT64_MAX)
#error Largest strtoint() conversion function converts to an int less than 64 bits wide!
#endif
if (NULL == endptr) ERROR;
if ('\0' != *endptr) ERROR;
// TODO: return _encode_int(1024) if value takes up more than 64 bits!
/* determine the number of bits used... */
for (bitsize = 0; ival > 0; ival /= 2, bitsize++);
/* special case... if (value == 0) <=> (bitsize == 0), return bit size of 1 ! */
if (0 == bitsize) bitsize = 1;
return _encode_int(bitsize);
#endif
/* We could first convert from string to some kind of integer, and then
* determine the the bitsize using integer aritmetic.
* However, we are then limited to the bit size of the widest available integer
* (usually 64 bits), which is not good at all!
*/
/* Let's try to determine bitsize by converting directly from the string!! */
char *sval = strdup(symbol->value);
char *oval = sval;
if (NULL == sval) ERROR;
if ('\0' == *sval) ERROR;
for (bitsize = 0; *sval != '\0'; strdivby2(&sval), bitsize ++);
/* Even for (value == 0), the above loop will return bitsize == 1!,
* so we don't need to handle the special case...
*/
/* special case... if (value == 0) <=> (bitsize == 0), return bit size of 1 ! */
// if (0 == bitsize) bitsize = 1;
free(oval);
return _encode_int(bitsize);
}
/* NOTE: all integer and real literal tokens will always be positive (i.e. no leading '-')
* due to the way the source code is parsed by iec.flex.
*/
void *get_sizeof_datatype_c::visit(binary_integer_c *symbol) {
const char *sval = symbol->value;
int bitsize = 0;
/* first 2 characters had better be "2#" ! */
if (NULL == sval) ERROR;
if ('\0' == *sval) ERROR;
if ( '2' != *sval) ERROR;
sval++;
if ('\0' == *sval) ERROR;
if ( '#' != *sval) ERROR;
sval++;
if ('\0' == *sval) ERROR;
/* determine the number of bits used... */
for (bitsize = 0; '\0' != *sval; sval++, bitsize++) {
/* consistency check: make sure we only have binary digits! */
if (('0' != *sval) && ('1' != *sval))
ERROR;
}
/* special case... if (value == 0) <=> (bitsize == 0), return bit size of 1 ! */
if (0 == bitsize) bitsize = 1;
return _encode_int(bitsize);
}
/* NOTE: all integer and real literal tokens will always be positive (i.e. no leading '-')
* due to the way the source code is parsed by iec.flex.
*/
void *get_sizeof_datatype_c::visit(octal_integer_c *symbol) {
const char *sval = symbol->value;
int bitsize = 0;
/* first 2 characters had better be "8#" ! */
if (NULL == sval) ERROR;
if ('\0' == *sval) ERROR;
if ( '8' != *sval) ERROR;
sval++;
if ('\0' == *sval) ERROR;
if ( '#' != *sval) ERROR;
sval++;
if ('\0' == *sval) ERROR;
/* determine the number of bits used... */
for (bitsize = 0; '\0' != *sval; sval++, bitsize += 3 /* 3 bits per octal digit */) {
/* consistency check: make sure we only have octal digits! */
/* Assumes ASCII */
if (('0' > *sval) || ('7' < *sval))
ERROR;
}
/* special case... if (value == 0) <=> (bitsize == 0), return bit size of 1 ! */
if (0 == bitsize) bitsize = 1;
return _encode_int(bitsize);
}
/* NOTE: all integer and real literal tokens will always be positive (i.e. no leading '-')
* due to the way the source code is parsed by iec.flex.
*/
void *get_sizeof_datatype_c::visit(hex_integer_c *symbol) {
const char *sval = symbol->value;
int bitsize = 0;
/* first 3 characters had better be "16#" ! */
if (NULL == sval) ERROR;
if ('\0' == *sval) ERROR;
if ( '1' != *sval) ERROR;
sval++;
if ('\0' == *sval) ERROR;
if ( '6' != *sval) ERROR;
sval++;
if ('\0' == *sval) ERROR;
if ( '#' != *sval) ERROR;
sval++;
if ('\0' == *sval) ERROR;
/* determine the number of bits used... */
for (bitsize = 0; '\0' != *sval; sval++, bitsize += 4 /* 4 bits per hex digit */) {
/* consistency check: make sure we only have hex digits! */
/* Assumes ASCII */
if (!(('0' <= *sval) && ('9' >= *sval)) &&
!(('A' <= *sval) && ('F' >= *sval)) &&
!(('a' <= *sval) && ('b' >= *sval)))
ERROR;
}
/* special case... if (value == 0) <=> (bitsize == 0), return bit size of 1 ! */
if (0 == bitsize) bitsize = 1;
return _encode_int(bitsize);
}
/***********************************/
/* B 1.3.1 - Elementary Data Types */
/***********************************/
// void *get_sizeof_datatype_c::visit(time_type_name_c *symbol) {return _encode_int(0); }
void *get_sizeof_datatype_c::visit(bool_type_name_c *symbol) {return _encode_int(1); }
void *get_sizeof_datatype_c::visit(sint_type_name_c *symbol) {return _encode_int(8); }
void *get_sizeof_datatype_c::visit(int_type_name_c *symbol) {return _encode_int(16);}
void *get_sizeof_datatype_c::visit(dint_type_name_c *symbol) {return _encode_int(32);}
void *get_sizeof_datatype_c::visit(lint_type_name_c *symbol) {return _encode_int(64);}
void *get_sizeof_datatype_c::visit(usint_type_name_c *symbol) {return _encode_int(8); }
void *get_sizeof_datatype_c::visit(uint_type_name_c *symbol) {return _encode_int(16);}
void *get_sizeof_datatype_c::visit(udint_type_name_c *symbol) {return _encode_int(32);}
void *get_sizeof_datatype_c::visit(ulint_type_name_c *symbol) {return _encode_int(64);}
void *get_sizeof_datatype_c::visit(real_type_name_c *symbol) {return _encode_int(32);}
void *get_sizeof_datatype_c::visit(lreal_type_name_c *symbol) {return _encode_int(64);}
// void *get_sizeof_datatype_c::visit(date_type_name_c *symbol) {return _encode_int(0); }
// void *get_sizeof_datatype_c::visit(tod_type_name_c *symbol) {return _encode_int(0); }
// void *get_sizeof_datatype_c::visit(dt_type_name_c *symbol) {return _encode_int(0); }
void *get_sizeof_datatype_c::visit(byte_type_name_c *symbol) {return _encode_int(8); }
void *get_sizeof_datatype_c::visit(word_type_name_c *symbol) {return _encode_int(16);}
void *get_sizeof_datatype_c::visit(dword_type_name_c *symbol) {return _encode_int(32);}
void *get_sizeof_datatype_c::visit(lword_type_name_c *symbol) {return _encode_int(64);}
// void *get_sizeof_datatype_c::visit(string_type_name_c *symbol) {return _encode_int(0); }
// void *get_sizeof_datatype_c::visit(wstring_type_name_c *symbol) {return _encode_int(0); }
/******************************************************/
/* Extensions to the base standard as defined in */
/* "Safety Software Technical Specification, */
/* Part 1: Concepts and Function Blocks, */
/* Version 1.0 – Official Release" */
/* by PLCopen - Technical Committee 5 - 2006-01-31 */
/******************************************************/
void *get_sizeof_datatype_c::visit(safebool_type_name_c *symbol) {return _encode_int(1);}
/********************************/
/* B 1.3.3 - Derived data types */
/********************************/
// Not yet supported...