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perf probe: Handle gracefully some stupid and buggy line syntaxes 

Currently perf probe doesn't handle those incorrect syntaxes:

   $ perf probe -L sched.c:++13
   $ perf probe -L sched.c:-+13
   $ perf probe -L sched.c:10000000000000000000000000000+13

This patches rewrites parse_line_range_desc() to handle them.

As a bonus, it reports more useful error messages instead of: "Tailing
with invalid character...".

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
LKML-Reference: <1292854685-8230-7-git-send-email-fbuihuu@gmail.com>
Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Franck Bui-Huu 2010-12-20 15:18:05 +01:00 committed by Arnaldo Carvalho de Melo
parent fde52dbd7f
commit 21dd9ae5a4
1 changed files with 60 additions and 32 deletions
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92
tools/perf/util/probe-event.c
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@ -529,6 +529,19 @@ int show_available_vars(struct perf_probe_event *pevs __unused,
}
#endif
static int parse_line_num(char **ptr, int *val, const char *what)
{
const char *start = *ptr;
errno = 0;
*val = strtol(*ptr, ptr, 0);
if (errno || *ptr == start) {
semantic_error("'%s' is not a valid number.\n", what);
return -EINVAL;
}
return 0;
}
/*
* Stuff 'lr' according to the line range described by 'arg'.
* The line range syntax is described by:
@ -538,50 +551,65 @@ int show_available_vars(struct perf_probe_event *pevs __unused,
*/
int parse_line_range_desc(const char *arg, struct line_range *lr)
{
const char *ptr;
char *tmp;
char *range, *name = strdup(arg);
int err;
if (!name)
return -ENOMEM;
lr->start = 0;
lr->end = INT_MAX;
range = strchr(name, ':');
if (range) {
*range++ = '\0';
err = parse_line_num(&range, &lr->start, "start line");
if (err)
goto err;
if (*range == '+' || *range == '-') {
const char c = *range++;
err = parse_line_num(&range, &lr->end, "end line");
if (err)
goto err;
if (c == '+') {
lr->end += lr->start;
/*
* Adjust the number of lines here.
* If the number of lines == 1, the
* the end of line should be equal to
* the start of line.
*/
lr->end--;
}
}
ptr = strchr(arg, ':');
if (ptr) {
lr->start = (int)strtoul(ptr + 1, &tmp, 0);
if (*tmp == '+') {
lr->end = lr->start + (int)strtoul(tmp + 1, &tmp, 0);
lr->end--; /*
* Adjust the number of lines here.
* If the number of lines == 1, the
* the end of line should be equal to
* the start of line.
*/
} else if (*tmp == '-')
lr->end = (int)strtoul(tmp + 1, &tmp, 0);
else
lr->end = INT_MAX;
pr_debug("Line range is %d to %d\n", lr->start, lr->end);
err = -EINVAL;
if (lr->start > lr->end) {
semantic_error("Start line must be smaller"
" than end line.\n");
return -EINVAL;
goto err;
}
if (*tmp != '\0') {
semantic_error("Tailing with invalid character '%d'.\n",
*tmp);
return -EINVAL;
if (*range != '\0') {
semantic_error("Tailing with invalid str '%s'.\n", range);
goto err;
}
tmp = strndup(arg, (ptr - arg));
} else {
tmp = strdup(arg);
lr->end = INT_MAX;
}
if (tmp == NULL)
return -ENOMEM;
if (strchr(tmp, '.'))
lr->file = tmp;
if (strchr(name, '.'))
lr->file = name;
else
lr->function = tmp;
lr->function = name;
return 0;
err:
free(name);
return err;
}
/* Check the name is good for event/group */