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hush: add parse tree debug print

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This commit is contained in:
Denis Vlasenko 2007-05-04 13:07:27 +00:00
parent 6e6d331d97
commit 400c5b6fc6
2 changed files with 66 additions and 5 deletions
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4
shell/README
View File

@ -1,5 +1,9 @@
Various bits of what is known about busybox shells, in no particular order.
2007-05-03
hush: new bug spotted: Ctrl-C on "while true; do true; done" kills shell,
not just the loop.
2007-05-03
hush: update on "sleep 1 | exit 3; echo $?" bug.
parse_stream_outer() repeatedly calls parse_stream().

67
shell/hush.c
View File

@ -85,11 +85,12 @@
/* If you comment out one of these below, it will be #defined later
* to perform debug printfs to stderr: */
#define debug_printf(...) do {} while (0)
/* Finer-grained debug switch */
#define debug_printf_jobs(...) do {} while (0)
#define debug_printf_exec(...) do {} while (0)
#define debug_printf(...) do {} while (0)
/* Finer-grained debug switches */
#define debug_printf_jobs(...) do {} while (0)
#define debug_printf_exec(...) do {} while (0)
#define debug_printf_parse(...) do {} while (0)
#define debug_print_tree(a, b) do {} while (0)
#ifndef debug_printf
@ -1860,6 +1861,61 @@ static int run_pipe_real(struct pipe *pi)
return -1;
}
#ifndef debug_print_tree
static void debug_print_tree(struct pipe *pi, int lvl)
{
static const char *PIPE[] = {
[PIPE_SEQ] = "SEQ",
[PIPE_AND] = "AND",
[PIPE_OR ] = "OR",
[PIPE_BG ] = "BG",
};
static const char *RES[] = {
[RES_NONE ] = "NONE" ,
[RES_IF ] = "IF" ,
[RES_THEN ] = "THEN" ,
[RES_ELIF ] = "ELIF" ,
[RES_ELSE ] = "ELSE" ,
[RES_FI ] = "FI" ,
[RES_FOR ] = "FOR" ,
[RES_WHILE] = "WHILE",
[RES_UNTIL] = "UNTIL",
[RES_DO ] = "DO" ,
[RES_DONE ] = "DONE" ,
[RES_XXXX ] = "XXXX" ,
[RES_IN ] = "IN" ,
[RES_SNTX ] = "SNTX" ,
};
int pin, prn;
char **argv;
pin = 0;
while (pi) {
fprintf(stderr, "%*spipe %d r_mode=%s followup=%d %s\n", lvl*2, "",
pin, RES[pi->r_mode], pi->followup, PIPE[pi->followup]);
prn = 0;
while (prn < pi->num_progs) {
fprintf(stderr, "%*s prog %d", lvl*2, "", prn);
if (pi->progs[prn].group) {
fprintf(stderr, " group: (argv=%p)\n", pi->progs[prn].argv);
debug_print_tree(pi->progs[prn].group, lvl+1);
prn++;
continue;
}
argv = pi->progs[prn].argv;
if (argv) while (*argv) {
fprintf(stderr, " '%s'", *argv);
argv++;
}
fprintf(stderr, "\n");
prn++;
}
pi = pi->next;
pin++;
}
}
#endif
// NB: called by pseudo_exec, and therefore must not modify any
// global data until exec/_exit (we can be a child after vfork!)
static int run_list_real(struct pipe *pi)
@ -2088,7 +2144,7 @@ static int run_list(struct pipe *pi)
/* free_pipe_list has the side effect of clearing memory
* In the long run that function can be merged with run_list_real,
* but doing that now would hobble the debugging effort. */
free_pipe_list(pi,0);
free_pipe_list(pi, 0);
return rcode;
}
@ -3177,6 +3233,7 @@ static int parse_stream_outer(struct in_str *inp, int flag)
done_word(&temp, &ctx);
done_pipe(&ctx, PIPE_SEQ);
debug_printf_exec("parse_stream_outer: run_list\n");
debug_print_tree(ctx.list_head, 0);
run_list(ctx.list_head);
} else {
if (ctx.old_flag != 0) {