1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/* yForth? - Written by Luca Padovani (C) 1996/97
* ------------------------------------------------------------------------
* This software is FreeWare as long as it comes with this header in each
* source file, anyway you can use it or any part of it whatever
* you want. It comes without any warranty, so use it at your own risk.
* ------------------------------------------------------------------------
* Module name: exceptio.c
* Abstract: exception word set
*/
#include <malloc.h>
#include <setjmp.h>
#include "yforth.h"
#include "core.h"
#include "exceptio.h"
/**************************************************************************/
/* VARIABLES **************************************************************/
/**************************************************************************/
struct exception_frame *top_frame; /* ptr to the top of exception stack */
/**************************************************************************/
/* WORDS ******************************************************************/
/**************************************************************************/
void _catch() {
register struct exception_frame *frame =
(struct exception_frame *) malloc(sizeof(struct exception_frame));
if (frame) {
register int ret_val;
if ((ret_val = setjmp(frame->catch_buf)) == 0) {
/* Executed when "catch" is invoked */
save_input_specification();
frame->sp = sp + 1;
frame->rp = rp;
frame->bp = bp;
frame->fp = fp;
frame->last = top_frame;
top_frame = frame;
exec_word((struct word_def *) *sp++);
*--sp = 0;
} else *--sp = ret_val;
frame = top_frame;
sp = frame->sp;
rp = frame->rp;
bp = frame->bp;
top_frame = frame->last;
free(frame);
restore_input_specification();
}
}
void _throw() {
register Cell n = *sp++;
if (n) {
if (top_frame) longjmp(top_frame->catch_buf, n);
else if (n == -1) ;
else if (n == -2) _type();
sp = sp_top;
longjmp(warm_start_jump, 1);
}
}
|
