--- a/stage4/generate_cc/plciec.h Wed Jul 11 09:53:27 2007 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,776 +0,0 @@
-/*
- * (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)
- *
- */
-
-
-/*
- * Code to be included into the code generated by the 4th stage.
- *
- * This is part of the 4th stage that generates
- * a c++ source program equivalent to the IL and ST
- * code.
- */
-
-
-#ifndef __PLCIEC_H
-#define __PLCIEC_H
-
-//#include <stdio.h>
-#include "plc.h"
-#include <math.h>
-#include <time.h>
-
-
-
-/* function that generates an IEC runtime error */
-void IEC_error(void) {
- /* TODO... */
- fprintf(stderr, "IEC 61131-3 runtime error.\n");
- exit(1);
-}
-
-
-
-typedef bool BOOL;
-#define TRUE true
-#define FALSE false
-
-typedef i8 SINT;
-typedef i16 INT;
-typedef i32 DINT;
-typedef i64 LINT;
-
-typedef u8 USINT;
-typedef u16 UINT;
-typedef u32 UDINT;
-typedef u64 ULINT;
-
-typedef u8 BYTE;
-typedef u16 WORD;
-typedef u32 DWORD;
-typedef u64 LWORD;
-
-typedef f32 REAL;
-typedef f64 LREAL;
-
-
-
-
-
-
-/*********************************************/
-/* TIME AND DATE data trypes */
-/*********************************************/
-
-/* NOTE: All the time and date data types use a struct timespec
- * internally to store the time and date. This is so as to ease all the
- * operations (add, subtract, multiply and division) the standard defines
- * on these same data types.
- * However, in order to ease the implementation of the comparison operators
- * (==, =>, <=, <, >, <>), the two elements in the timespec structure
- * must be handled in such a way as to guarantee the following:
- * - The stored time is always the result of the operation tv_sec + tv_nsec*1e-9
- * - tv_sec and tv_nsec will always have the same sign
- * (i.e. either both positive or both negative)
- * - tv_nsec always holds a value in the range ]-1, +1[ seconds.
- * (note that -1 and +1 are excluded form the range)
- */
-
-
-/* NOTE: According to the C++ standard, the result of the % and / operations is implementation dependent
- * when the at least one of the operands is negative! However, whatever the result of the operations, we are
- * guaranteed that (a/b)*b + (a%b) is always equal to a.
- * This means that, even knowing that both tv_sec and tv_sec always have the same sign (we make it so this is true),
- * we must still re-normailze the result for both the addition and subtraction operations!
- */
-
-static inline void __normalizesign_timespec (struct timespec *ts) {
- if ((ts->tv_sec > 0) && (ts->tv_nsec < 0)) {
- ts->tv_sec--;
- ts->tv_nsec += 1000000000;
- }
- if ((ts->tv_sec < 0) && (ts->tv_nsec > 0)) {
- ts->tv_sec++;
- ts->tv_nsec -= 1000000000;
- }
-}
-
-
-static inline struct timespec __add_timespec (const struct timespec &t1, const struct timespec &t2) {
- /* NOTE the following sum works correctly because a long can hold a litle more than 2 seconds expressed in nano seconds! */
- long nsec;
- nsec = t1.tv_nsec + t2.tv_nsec;
- struct timespec ts;
- ts.tv_sec = t1.tv_sec + t2.tv_sec + (nsec / 1000000000);
- ts.tv_nsec = nsec % 1000000000;
-
- __normalizesign_timespec(&ts);
-
-return ts;
-}
-
-
-static inline struct timespec __sub_timespec (const struct timespec &t1, const struct timespec &t2) {
- /* NOTE the following subtraction works correctly because a long can hold a litle more than 2 seconds expressed in nano seconds! */
- long nsec = t1.tv_nsec - t2.tv_nsec;
- struct timespec ts;
- ts.tv_sec = t1.tv_sec - t2.tv_sec + nsec / 1000000000;
- ts.tv_nsec = nsec % 1000000000;
-
- __normalizesign_timespec(&ts);
-
- return ts;
-}
-
-
-static inline struct timespec __mul_timespec (const struct timespec &t1, const long double value) {
-#if 0
- /* A simple implementation that risks reducing the precision of the TIME value */
- long double sec_d1 = t1.tv_nsec / (long double)1e9 * value;
- long double sec_d2 = t1.tv_sec * value;
- long int sec = (long int)truncl(sec_d1 + sec_d2);
- struct timespec ts;
- ts.tv_sec = sec;
- ts.tv_nsec = (long int)((sec_d1 + sec_d2 - sec)*1e9);
- return ts;
-#else
- /* A more robust implementation that reduces the loss of precision of the TIME value */
- /* NOTE: The following assumes that the value stored in tv_nsec is never larger than 1 sec
- * and is also based on the fact that tv_nsec can safely store slighlty more thanb 2 sec.
- */
- long double sec_d1 = t1.tv_nsec / (long double)1e9 * value;
- long double sec_d2 = t1.tv_sec * value;
- long int sec1 = (long int)sec_d1;
- long int sec2 = (long int)sec_d2;
- struct timespec ts;
- ts.tv_sec = sec1 + sec2;
- ts.tv_nsec = (long int)(((sec_d1 - sec1) + (sec_d2 - sec2))*1e9);
- /* re-normalize the value of tv_nsec */
- /* i.e. guarantee that it falls in the range ]-1, +1[ seconds. */
- if (ts.tv_nsec >= 1000000000) {ts.tv_nsec -= 1000000000; ts.tv_sec += 1;}
- if (ts.tv_nsec <= -1000000000) {ts.tv_nsec += 1000000000; ts.tv_sec -= 1;}
- /* We don't need to re-normalize the sign, since we are guaranteed that tv_sec and tv_nsec
- * will still both have the same sign after being multiplied by the same value.
- */
- return ts;
-#endif
-}
-
-/* Helper Macro for the comparison operators... */
-#define __compare_timespec(CMP, t1, t2) ((t1.tv_sec == t2.tv_sec)? t1.tv_nsec CMP t2.tv_nsec : t1.tv_sec CMP t2.tv_sec)
-
-
-
-/* Some necessary forward declarations... */
-/*
-class TIME;
-class TOD;
-class DT;
-class DATE;
-
-typedef struct timespec __timebase_t;
-*/
-
-typedef struct TIME timespec;
-typedef struct TOD timespec;
-typedef struct DT timespec;
-typedef struct DATE timespec;
-
-static inline struct timespec __time_to_timespec(int sign, double mseconds, double seconds, double minutes, double hours, double days) {
- struct timespec ts;
-
- /* sign is 1 for positive values, -1 for negative time... */
- long double total_sec = ((days*24 + hours)*60 + minutes)*60 + seconds + mseconds/1e3;
- if (sign >= 0) sign = 1; else sign = -1;
- ts.tv_sec = sign * (long int)total_sec;
- ts.tv_nsec = sign * (long int)((total_sec - ts.tv_sec)*1e9);
-
- return ts;
-}
-
-
-static inline struct timespec __tod_to_timespec(double seconds, double minutes, double hours) {
- struct timespec ts;
-
- long double total_sec = (hours*60 + minutes)*60 + seconds;
- ts.tv_sec = (long int)total_sec;
- ts.tv_nsec = (long int)((total_sec - ts.tv_sec)*1e9);
-
- return ts;
-}
-
-static inline struct timespec __date_to_timespec(int day, int month, int year) {
- struct timespec ts;
- struct tm broken_down_time;
-
- broken_down_time.tm_sec = 0;
- broken_down_time.tm_min = 0;
- broken_down_time.tm_hour = 0;
- broken_down_time.tm_mday = day; /* day of month, from 1 to 31 */
- broken_down_time.tm_mon = month - 1; /* month since January, in the range 0 to 11 */
- broken_down_time.tm_year = year - 1900; /* number of years since 1900 */
-
- time_t epoch_seconds = mktime(&broken_down_time); /* determine number of seconds since the epoch, i.e. Jan 1st 1970 */
-
- if ((time_t)(-1) == epoch_seconds)
- IEC_error();
-
- ts.tv_sec = epoch_seconds;
- ts.tv_nsec = 0;
-
- return ts;
-}
-
-static inline struct timespec __dt_to_timespec(double seconds, double minutes, double hours, int day, int month, int year) {
- struct timespec ts;
-
- long double total_sec = (hours*60 + minutes)*60 + seconds;
- ts.tv_sec = (long int)total_sec;
- ts.tv_nsec = (long int)((total_sec - ts.tv_sec)*1e9);
-
- struct tm broken_down_time;
- broken_down_time.tm_sec = 0;
- broken_down_time.tm_min = 0;
- broken_down_time.tm_hour = 0;
- broken_down_time.tm_mday = day; /* day of month, from 1 to 31 */
- broken_down_time.tm_mon = month - 1; /* month since January, in the range 0 to 11 */
- broken_down_time.tm_year = year - 1900; /* number of years since 1900 */
-
- time_t epoch_seconds = mktime(&broken_down_time); /* determine number of seconds since the epoch, i.e. Jan 1st 1970 */
- if ((time_t)(-1) == epoch_seconds)
- IEC_error();
-
- ts.tv_sec += epoch_seconds;
- if (ts.tv_sec < epoch_seconds)
- /* since the TOD is always positive, if the above happens then we had an overflow */
- IEC_error();
-
- return ts;
-}
-
-
-
-
-
-
-
-
-#ifdef 0
-class TIME{
- private:
- /* private variable that contains the value of time. */
- /* NOTE: The stored value is _always_ (time.tv_sec + time.tv_nsec),
- no matter whether tv_sec is positive or negative, or tv_nsec is positive or negative.
- */
- __timebase_t time;
-
- public:
- /* conversion to __timebase_t */
- operator __timebase_t(void) {return time;}
-
- /* constructors... */
- TIME (void) {time.tv_sec = 0; time.tv_nsec = 0;}
- TIME (__timebase_t time) {this->time = time;}
- TIME (const TIME &time) {this->time = time.time;} /* copy constructor */
- TIME(int sign, double mseconds, double seconds=0, double minutes=0, double hours=0, double days=0) {
- /* sign is 1 for positive values, -1 for negative time... */
- long double total_sec = ((days*24 + hours)*60 + minutes)*60 + seconds + mseconds/1e3;
- if (sign >= 0) sign = 1; else sign = -1;
- time.tv_sec = sign * (long int)total_sec;
- time.tv_nsec = sign * (long int)((total_sec - time.tv_sec)*1e9);
- }
-
- /* used in plciec.cc to set the value of the __CURRENT_TIME variable without having to call a
- * TIME((__timebase_t time) constructor followed by the copy constructor.
- */
- void operator= (__timebase_t time) {this->time = time;}
-
- /* Arithmetic operators (section 2.5.1.5.6. of version 2 of the IEC 61131-3 standard) */
- TIME operator+ (const TIME &time) {return TIME(__add_timespec(this->time, time.time));}
- TIME operator- (const TIME &time) {return TIME(__sub_timespec(this->time, time.time));}
-
- friend TOD operator+ (const TIME &time, const TOD &tod);
- friend TOD operator+ (const TOD &tod, const TIME &time);
- friend TOD operator- (const TOD &tod, const TIME &time);
-
- friend DT operator+ (const TIME &time, const DT &dt);
- friend DT operator+ (const DT &dt, const TIME &time);
- friend DT operator- (const DT &dt, const TIME &time);
-
- friend TIME operator* (const TIME &time, const long double value);
- friend TIME operator* (const long double value, const TIME &time);
- friend TIME operator/ (const TIME &time, const long double value);
-
- /* Comparison operators (section 2.5.1.5.4. of version 2 of the IEC 61131-3 standard) */
- BOOL operator> (const TIME &time) {return __compare_timespec(>, this->time, time.time);}
- BOOL operator>= (const TIME &time) {return __compare_timespec(>=, this->time, time.time);}
- BOOL operator< (const TIME &time) {return __compare_timespec(<, this->time, time.time);}
- BOOL operator<= (const TIME &time) {return __compare_timespec(<=, this->time, time.time);}
- BOOL operator== (const TIME &time) {return __compare_timespec(==, this->time, time.time);}
- BOOL operator!= (const TIME &time) {return !__compare_timespec(==, this->time, time.time);}
-};
-
-
-
-/* Time of Day */
-class TOD {
- private:
- __timebase_t time;
-
- public:
- /* conversion to __timebase_t */
- operator __timebase_t(void) {return time;}
-
- /* constructors... */
- TOD (void) {time.tv_sec = 0; time.tv_nsec = 0;}
- TOD (__timebase_t time) {this->time = time;}
- TOD (const TOD &tod) {this->time = tod.time;} /* copy constructor */
- TOD (double seconds, double minutes=0, double hours=0) {
- long double total_sec = (hours*60 + minutes)*60 + seconds;
- time.tv_sec = (long int)total_sec;
- time.tv_nsec = (long int)((total_sec - time.tv_sec)*1e9);
- }
-
- /* Arithmetic operators (section 2.5.1.5.6. of version 2 of the IEC 61131-3 standard) */
- TIME operator- (const TOD &tod) {return TIME(__sub_timespec(this->time, tod.time));}
-
- friend TOD operator+ (const TIME &time, const TOD &tod);
- friend TOD operator+ (const TOD &tod, const TIME &time);
- friend TOD operator- (const TOD &tod, const TIME &time);
-
- /* The following operation is not in the standard,
- * but will ease the implementation of the default function CONCAT_DATE_TOD
- */
- friend DT operator+ (const DATE &date, const TOD &tod);
- friend DT operator+ (const TOD &tod, const DATE &date);
-
- /* Comparison operators (section 2.5.1.5.4. of version 2 of the IEC 61131-3 standard) */
- BOOL operator> (const TOD &tod) {return __compare_timespec(>, this->time, tod.time);}
- BOOL operator>= (const TOD &tod) {return __compare_timespec(>=, this->time, tod.time);}
- BOOL operator< (const TOD &tod) {return __compare_timespec(<, this->time, tod.time);}
- BOOL operator<= (const TOD &tod) {return __compare_timespec(<=, this->time, tod.time);}
- BOOL operator== (const TOD &tod) {return __compare_timespec(==, this->time, tod.time);}
- BOOL operator!= (const TOD &tod) {return !__compare_timespec(==, this->time, tod.time);}
-};
-
-
-
-//typedef DATE;
-class DATE {
- private:
- __timebase_t time;
-
- public:
- /* conversion to __timebase_t */
- operator __timebase_t(void) {return time;}
-
- /* constructors... */
- DATE (void) {time.tv_sec = 0; time.tv_nsec = 0;}
- DATE (__timebase_t time) {this->time = time;}
- DATE (const DATE &date) {this->time = date.time;} /* copy constructor */
- DATE (int day, int month, int year) {
- struct tm broken_down_time;
-
- broken_down_time.tm_sec = 0;
- broken_down_time.tm_min = 0;
- broken_down_time.tm_hour = 0;
- broken_down_time.tm_mday = day; /* day of month, from 1 to 31 */
- broken_down_time.tm_mon = month - 1; /* month since January, in the range 0 to 11 */
- broken_down_time.tm_year = year - 1900; /* number of years since 1900 */
-
- time_t epoch_seconds = mktime(&broken_down_time); /* determine number of seconds since the epoch, i.e. Jan 1st 1970 */
-
- if ((time_t)(-1) == epoch_seconds)
- IEC_error();
-
- time.tv_sec = epoch_seconds;
- time.tv_nsec = 0;
- }
-
- /* Arithmetic operators (section 2.5.1.5.6. of version 2 of the IEC 61131-3 standard) */
- TIME operator- (const DATE &date) {return TIME(__sub_timespec(this->time, date.time));}
- /* The following operation is not in the standard,
- * but will ease the implementation of the default function CONCAT_DATE_TOD
- */
- friend DT operator+ (const DATE &date, const TOD &tod);
- friend DT operator+ (const TOD &tod, const DATE &date);
-
- /* Comparison operators (section 2.5.1.5.4. of version 2 of the IEC 61131-3 standard) */
- BOOL operator> (const DATE &date) {return __compare_timespec(>, this->time, date.time);}
- BOOL operator>= (const DATE &date) {return __compare_timespec(>=, this->time, date.time);}
- BOOL operator< (const DATE &date) {return __compare_timespec(<, this->time, date.time);}
- BOOL operator<= (const DATE &date) {return __compare_timespec(<=, this->time, date.time);}
- BOOL operator== (const DATE &date) {return __compare_timespec(==, this->time, date.time);}
- BOOL operator!= (const DATE &date) {return !__compare_timespec(==, this->time, date.time);}
-};
-
-
-
-
-
-class DT {
- private:
- __timebase_t time;
-
- public:
- /* conversion to __timebase_t */
- operator __timebase_t(void) {return time;}
-
- /* constructors... */
- DT (void) {time.tv_sec = 0; time.tv_nsec = 0;}
- DT (__timebase_t time) {this->time = time;}
- DT (const DT &dt) {this->time = dt.time;} /* copy constructor */
- DT (double seconds, double minutes, double hours, int day, int month, int year) {
- long double total_sec = (hours*60 + minutes)*60 + seconds;
- time.tv_sec = (long int)total_sec;
- time.tv_nsec = (long int)((total_sec - time.tv_sec)*1e9);
-
- struct tm broken_down_time;
- broken_down_time.tm_sec = 0;
- broken_down_time.tm_min = 0;
- broken_down_time.tm_hour = 0;
- broken_down_time.tm_mday = day; /* day of month, from 1 to 31 */
- broken_down_time.tm_mon = month - 1; /* month since January, in the range 0 to 11 */
- broken_down_time.tm_year = year - 1900; /* number of years since 1900 */
-
- time_t epoch_seconds = mktime(&broken_down_time); /* determine number of seconds since the epoch, i.e. Jan 1st 1970 */
- if ((time_t)(-1) == epoch_seconds)
- IEC_error();
-
- time.tv_sec += epoch_seconds;
- if (time.tv_sec < epoch_seconds)
- /* since the TOD is always positive, if the above happens then we had an overflow */
- IEC_error();
- }
-
- /* Helpers to conversion operators (section 2.5.1.5.6. of version 2 of the IEC 61131-3 standard) */
- DATE __to_DATE(void) {
-#if 0
- /* slow version */
- struct tm broken_down_time;
- time_t seconds = time.tv_sec;
- if (NULL == gmtime_r(seconds, &broken_down_time)) /* get the UTC (GMT) broken down time */
- IEC_error();
- return DATE(broken_down_time.tm_mday, broken_down_time.tm_mon, broken_down_time.tm_year);
-#else
- /* Faster version, based on the fact that the date will always be a multiple of 60*60*24 seconds,
- * and that the value of tv_nsec falls in the range ]-1, +1[
- */
- /* The above is true since the Unix function mktime() seems to ignore all leap seconds! */
- struct timespec date_time = {time.tv_sec - (time.tv_sec % (24*60*60)), 0};
- return DATE(date_time);
-#endif
- }
-
- TOD __to_TOD(void) {
-#if 0
- /* slow version */
- struct tm broken_down_time;
- time_t seconds = time.tv_sec;
- if (NULL == gmtime_r(seconds, &broken_down_time)) /* get the UTC (GMT) broken down time */
- IEC_error();
- return TOD(broken_down_time.tm_sec, broken_down_time.tm_min, broken_down_time.tm_hour);
-#else
- /* Faster version, based on the fact that the date will always be a multiple of 60*60*24 seconds
- * and that the value of tv_nsec falls in the range ]-1, +1[
- */
- /* The above is true since the Unix function mktime() seems to ignore all leap seconds! */
- struct timespec time_time = {time.tv_sec % (24*60*60), time.tv_nsec};
- return TOD(time_time);
-#endif
- }
-
- /* Arithmetic operators (section 2.5.1.5.6. of version 2 of the IEC 61131-3 standard) */
- TIME operator- (const DT &dt) {return TIME(__sub_timespec(this->time, dt.time));}
-
- friend DT operator+ (const TIME &time, const DT &dt);
- friend DT operator+ (const DT &dt, const TIME &time);
- friend DT operator- (const DT &dt, const TIME &time);
-
- /* Comparison operators (section 2.5.1.5.4. of version 2 of the IEC 61131-3 standard) */
- BOOL operator> (const DT &dt) {return __compare_timespec(>, this->time, dt.time);}
- BOOL operator>= (const DT &dt) {return __compare_timespec(>=, this->time, dt.time);}
- BOOL operator< (const DT &dt) {return __compare_timespec(<, this->time, dt.time);}
- BOOL operator<= (const DT &dt) {return __compare_timespec(<=, this->time, dt.time);}
- BOOL operator== (const DT &dt) {return __compare_timespec(==, this->time, dt.time);}
- BOOL operator!= (const DT &dt) {return !__compare_timespec(==, this->time, dt.time);}
-};
-
-
-/* The operations on time and data types... */
-TOD operator+ (const TIME &time, const TOD &tod) {return TOD(__add_timespec(tod.time, time.time));};
-TOD operator+ (const TOD &tod, const TIME &time) {return TOD(__add_timespec(tod.time, time.time));};
-TOD operator- (const TOD &tod, const TIME &time) {return TOD(__sub_timespec(tod.time, time.time));};
-
-DT operator+ (const TIME &time, const DT &dt) {return DT(__add_timespec(dt.time, time.time));};
-DT operator+ (const DT &dt, const TIME &time) {return DT(__add_timespec(dt.time, time.time));};
-DT operator- (const DT &dt, const TIME &time) {return DT(__sub_timespec(dt.time, time.time));};
-
-TIME operator* (const TIME &time, const long double value) {return TIME(__mul_timespec(time.time, value));}
-TIME operator* (const long double value, const TIME &time) {return TIME(__mul_timespec(time.time, value));}
-TIME operator/ (const TIME &time, const long double value) {return TIME(__mul_timespec(time.time, 1.0/value));}
-
-/* The following operation is not in the standard,
- * but will ease the implementation of the default function CONCAT_DATE_TOD
- */
-DT operator+ (const DATE &date, const TOD &tod) {return DT(__add_timespec(date.time, tod.time));};
-DT operator+ (const TOD &tod, const DATE &date) {return DT(__add_timespec(date.time, tod.time));};
-
-#endif
-
-/* global variable that will be used to implement the timers TON, TOFF and TP */
-extern TIME __CURRENT_TIME;
-
-
-
-//typedef STRING;
-//typedef WSTRING;
-
-
-
-typedef union __IL_DEFVAR_T {
- BOOL BOOLvar;
-
- SINT SINTvar;
- INT INTvar;
- DINT DINTvar;
- LINT LINTvar;
-
- USINT USINTvar;
- UINT UINTvar;
- UDINT UDINTvar;
- ULINT ULINTvar;
-
- BYTE BYTEvar;
- WORD WORDvar;
- DWORD DWORDvar;
- LWORD LWORDvar;
-
- REAL REALvar;
- LREAL LREALvar;
-
- /* NOTE: since the TIME, DATE, ... classes all have constructors,
- * C++ does not allow them to be used as members of a union.
- * The workaround is to use a base data type (in this case __timebase_t) that
- * contains all the internal data these classes require, and then add an operator
- * member function to each class that allows it to be converted to that same base data type,
- * acompanied by a constructor using that data type.
- */
-
- TIME TIMEvar;
- TOD TODvar;
- DT DTvar;
- DATE DATEvar;
-
- /*
- __timebase_t TIMEvar;
- __timebase_t TODvar;
- __timebase_t DTvar;
- __timebase_t DATEvar;
- */
-} __IL_DEFVAR_T;
- /*TODO TODO TODO TODO TODO TODO TODO TODO TODO
- * How do we add support for the possibility of storing
- * data values of derived data types into the default register,
- * to be later used for calling functions, stroing in another
- * variable, etc...?
- *
- * For example:
- * TYPE
- * point_t : STRUCT
- * x : INT;
- * y : INT;
- * END_STRUCT;
- * END_TYPE
- *
- * VAR p1, p2, p3 : point_t;
- *
- * LD p1
- * ST p2
- *
- *
- * We could do it with a pointer to void, that would contain not
- * the value itself, but rather the address in which the value
- * is currently stored.
- * For example, we could add a
- * void *generic_ptr
- * to this union, and then have the above LD and ST instructions
- * converted to:
- * __IL_DEFVAR.generic_ptr = (void *)(&p1);
- * p2 = *((point_t *)__IL_DEFVAR.generic_ptr);
- *
- * Unfortunately the above will only work as long as the p1 variable
- * does not get a chance to change its value before the default register
- * gets loaded with something esle (and therefore the value is no
- * longer needed).
- * Additionally, a scenario where the value of p1 may change before the
- * default register gets a new value is if p1 is used in a function block
- * call for an output parameter!
- * For example:
- *
- * LD p1
- * CAL funcblock(
- * param1 => p1
- * )
- * ST p2
- *
- * In the above scenario, p1 gets a new value when the function block
- * funcblock is called. When we get to copy the default register to
- * p2, we will no longer be copying the value that got stored in the default
- * register when we did 'LD p1', but rather the value returned by the
- * function block call!!!
- *
- * How the do we implement this???
- * We will probably need to declare a default variable of the correct data
- * type whenever we get these values stored to the default register.
- * For example
- * LD p1
- * ST p2
- *
- * would be converted to:
- * union {
- * point_tvar point_t;
- * } __IL_DEFVAR_special ;
- *
- * __IL_DEFVAR_special.point_tvar = p1;
- * p2 = __IL_DEFVAR_special.point_tvar;
- *
- * The above requires that we iterate through the whole Instruction list
- * before we start the conversion, in order to first determine if we need
- * to declare that new variable for the default register.
- *
- * Since we have to do this, it would probaly be a better idea to simply
- * do away with the __IL_DEFVAR_T data type we declare here, and
- * declare the __IL_DEFVAR at the begining of each IL code segment
- * with all the data types that get used in that segment!
- */
-
-
-/* Names start with double underscore so as not to clash with
- * names in ST or IL source code! Names including a double underscore are
- * ilegal under IL and ST!
- */
-
-/* This is an abstract base class, that cannot be instantiated... */
-template<typename value_type> class __ext_ref_c {
- public:
- virtual void operator= (value_type value) = 0;
- virtual operator value_type(void) = 0;
-};
-
-
-
-
-
-
-/* Names start with double underscore so as not to clash with
- * names in ST or IL source code! Names including a double underscore are
- * ilegal under IL and ST!
- */
-template<typename value_type> class __ext_element_c
- : public __ext_ref_c<value_type> {
-//{
-
- private:
- value_type value;
-
- public:
- virtual void operator= (value_type value) {
- this->value = value;
- }
-
- virtual operator value_type(void) {
- return value;
- }
-
- __ext_element_c(void) {}
-
- __ext_element_c(value_type value) {
- this->value = value;
- }
-};
-
-
-/* Names start with double underscore so as not to clash with
- * names in ST or IL source code! Names including a double underscore are
- * ilegal under IL and ST!
- */
-template<typename value_type, int size = 8 * sizeof(value_type) /* in bits */> class __plc_pt_c
- : public __ext_ref_c<value_type> {
-
- private:
- plc_pt_t plc_pt;
- bool valid_plc_pt;
-
- private:
- void init_name(const char *pt_name) {
- /* assume error! */
- valid_plc_pt = false;
- plc_pt = plc_pt_by_name(pt_name);
- if (plc_pt.valid == 0) {
- plc_pt = plc_pt_null();
- return;
- }
- /* We can't have this check here, otherwise the boolean variables won't work correctly,
- * since MatPLC uses 1 bit for boolean variables, whereas g++ uses 8 bits.
- */
- /*
- if (plc_pt_len(plc_pt) != size) {
- plc_pt = plc_pt_null();
- return;
- }
- */
- valid_plc_pt = true;
- }
-
- public:
- virtual void operator= (value_type value) {
- plc_set(plc_pt, *((u32 *)&value));
- }
-
- virtual operator value_type(void) {
- u32 tmp_val = plc_get(plc_pt);
- return *((value_type *)&tmp_val);
- }
-
- __plc_pt_c(const char *pt_name) {
- init_name(pt_name);
- }
-
- __plc_pt_c(const char *pt_name, value_type init_value) {
- init_name(pt_name);
- *this = init_value;
- }
-
- bool valid(void) {return valid_plc_pt;}
-};
-
-
-
-#define DEFAULT_MODULE_NAME "iec"
-
-
-
-#endif /* __PLCIEC_H */
-
-