109 lines
1.8 KiB
C
109 lines
1.8 KiB
C
/* $Header$ */
|
|
/*
|
|
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
* See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
*/
|
|
/* S T A C K _ C H A N G E . C */
|
|
|
|
|
|
#include <stdio.h>
|
|
#include <em_spec.h>
|
|
#include <em_mnem.h>
|
|
#include "types.h"
|
|
#include "debug.h"
|
|
#include "global.h"
|
|
|
|
#include "pop_push.h"
|
|
|
|
#define IS_LOC(l) (l!=(line_p) 0 && INSTR(l)==op_loc && TYPE(l)==OPSHORT)
|
|
|
|
int stack_change(l,sign)
|
|
line_p l;
|
|
char sign;
|
|
{
|
|
/* Interpret the string in the third column of the em_table file */
|
|
|
|
char *s;
|
|
bool argdef;
|
|
short arg = 0;
|
|
int sum = 0;
|
|
line_p p = PREV(l);
|
|
line_p pp = (p == (line_p) 0 ? (line_p) 0 : PREV(p));
|
|
short i = INSTR(l);
|
|
|
|
if (i < sp_fmnem || i > sp_lmnem) {
|
|
return 0;
|
|
}
|
|
if (TYPE(l) == OPSHORT) {
|
|
arg = SHORT(l);
|
|
if (arg < ws) {
|
|
/* E.g. a LOI 1 loads word-size bytes,
|
|
* not 1 byte!
|
|
*/
|
|
arg = ws;
|
|
}
|
|
argdef = TRUE;
|
|
} else {
|
|
argdef = FALSE;
|
|
}
|
|
s = pop_push[i];
|
|
if (*s == '0') return 0;
|
|
while (*s != '\0') {
|
|
if (*s++ == sign) {
|
|
switch(*s) {
|
|
case 'w':
|
|
sum += ws;
|
|
break;
|
|
case 'd':
|
|
sum += 2 * ws;
|
|
break;
|
|
case 'p':
|
|
sum += ps;
|
|
break;
|
|
case 'a':
|
|
if (!argdef) return -1;
|
|
sum += arg;
|
|
break;
|
|
case 'x':
|
|
if (IS_LOC(p)) {
|
|
sum += SHORT(p);
|
|
break;
|
|
} else {
|
|
return -1;
|
|
}
|
|
case 'y':
|
|
if (IS_LOC(pp)) {
|
|
sum += SHORT(pp);
|
|
break;
|
|
} else {
|
|
return -1;
|
|
}
|
|
case '?':
|
|
return -1;
|
|
default:
|
|
assert(FALSE);
|
|
}
|
|
}
|
|
s++;
|
|
}
|
|
return sum;
|
|
}
|
|
|
|
|
|
|
|
line_change(l,ok_out,pop_out,push_out)
|
|
line_p l;
|
|
bool *ok_out;
|
|
int *pop_out,*push_out;
|
|
{
|
|
short pop,push;
|
|
|
|
pop = stack_change(l,'-');
|
|
push = stack_change(l,'+');
|
|
*ok_out = (pop != -1 && push != -1);
|
|
*pop_out = pop;
|
|
*push_out = push;
|
|
}
|
|
|
|
|