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perf probe: Support escaped character in parser

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Support the special characters escaped by '\' in parser.  This allows
user to specify versions directly like below.

  =====
  # ./perf probe -x /lib64/libc-2.25.so malloc_get_state\\@GLIBC_2.2.5
  Added new event:
    probe_libc:malloc_get_state (on malloc_get_state@GLIBC_2.2.5 in /usr/lib64/libc-2.25.so)

  You can now use it in all perf tools, such as:

	  perf record -e probe_libc:malloc_get_state -aR sleep 1

  =====

Or, you can use separators in source filename, e.g.

  =====
  # ./perf probe -x /opt/test/a.out foo+bar.c:3
  Semantic error :There is non-digit character in offset.
    Error: Command Parse Error.
  =====

Usually "+" in source file cause parser error, but

  =====
  # ./perf probe -x /opt/test/a.out foo\\+bar.c:4
  Added new event:
    probe_a:main         (on @foo+bar.c:4 in /opt/test/a.out)

  You can now use it in all perf tools, such as:

	  perf record -e probe_a:main -aR sleep 1
  =====

escaped "\+" allows you to specify that.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Acked-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Paul Clarke <pc@us.ibm.com>
Cc: bhargavb <bhargavaramudu@gmail.com>
Cc: linux-rt-users@vger.kernel.org
Link: http://lkml.kernel.org/r/151309111236.18107.5634753157435343410.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu
2017-12-13 00:05:12 +09:00
committed by Arnaldo Carvalho de Melo
parent 1e9f9e8af0
commit c588d15812
2 changed files with 51 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

58
tools/perf/util/probe-event.c
View File

@@ -1325,27 +1325,30 @@ static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
{
char *ptr;
ptr = strchr(*arg, ':');
ptr = strpbrk_esc(*arg, ":");
if (ptr) {
*ptr = '\0';
if (!pev->sdt && !is_c_func_name(*arg))
goto ng_name;
pev->group = strdup(*arg);
pev->group = strdup_esc(*arg);
if (!pev->group)
return -ENOMEM;
*arg = ptr + 1;
} else
pev->group = NULL;
if (!pev->sdt && !is_c_func_name(*arg)) {
pev->event = strdup_esc(*arg);
if (pev->event == NULL)
return -ENOMEM;
if (!pev->sdt && !is_c_func_name(pev->event)) {
zfree(&pev->event);
ng_name:
zfree(&pev->group);
semantic_error("%s is bad for event name -it must "
"follow C symbol-naming rule.\n", *arg);
return -EINVAL;
}
pev->event = strdup(*arg);
if (pev->event == NULL)
return -ENOMEM;
return 0;
}
@@ -1373,7 +1376,7 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
arg++;
}
ptr = strpbrk(arg, ";=@+%");
ptr = strpbrk_esc(arg, ";=@+%");
if (pev->sdt) {
if (ptr) {
if (*ptr != '@') {
@@ -1387,7 +1390,7 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
pev->target = build_id_cache__origname(tmp);
free(tmp);
} else
pev->target = strdup(ptr + 1);
pev->target = strdup_esc(ptr + 1);
if (!pev->target)
return -ENOMEM;
*ptr = '\0';
@@ -1421,13 +1424,14 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
*
* Otherwise, we consider arg to be a function specification.
*/
if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
if (!strpbrk_esc(arg, "+@%")) {
ptr = strpbrk_esc(arg, ";:");
/* This is a file spec if it includes a '.' before ; or : */
if (memchr(arg, '.', ptr - arg))
if (ptr && memchr(arg, '.', ptr - arg))
file_spec = true;
}
ptr = strpbrk(arg, ";:+@%");
ptr = strpbrk_esc(arg, ";:+@%");
if (ptr) {
nc = *ptr;
*ptr++ = '\0';
@@ -1436,7 +1440,7 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
if (arg[0] == '\0')
tmp = NULL;
else {
tmp = strdup(arg);
tmp = strdup_esc(arg);
if (tmp == NULL)
return -ENOMEM;
}
@@ -1469,12 +1473,12 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
arg = ptr;
c = nc;
if (c == ';') { /* Lazy pattern must be the last part */
pp->lazy_line = strdup(arg);
pp->lazy_line = strdup(arg); /* let leave escapes */
if (pp->lazy_line == NULL)
return -ENOMEM;
break;
}
ptr = strpbrk(arg, ";:+@%");
ptr = strpbrk_esc(arg, ";:+@%");
if (ptr) {
nc = *ptr;
*ptr++ = '\0';
@@ -1501,7 +1505,7 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
semantic_error("SRC@SRC is not allowed.\n");
return -EINVAL;
}
pp->file = strdup(arg);
pp->file = strdup_esc(arg);
if (pp->file == NULL)
return -ENOMEM;
break;
@@ -2803,23 +2807,31 @@ static int find_probe_functions(struct map *map, char *name,
struct rb_node *tmp;
const char *norm, *ver;
char *buf = NULL;
bool cut_version = true;
if (map__load(map) < 0)
return 0;
/* If user gives a version, don't cut off the version from symbols */
if (strchr(name, '@'))
cut_version = false;
map__for_each_symbol(map, sym, tmp) {
norm = arch__normalize_symbol_name(sym->name);
if (!norm)
continue;
/* We don't care about default symbol or not */
ver = strchr(norm, '@');
if (ver) {
buf = strndup(norm, ver - norm);
if (!buf)
return -ENOMEM;
norm = buf;
if (cut_version) {
/* We don't care about default symbol or not */
ver = strchr(norm, '@');
if (ver) {
buf = strndup(norm, ver - norm);
if (!buf)
return -ENOMEM;
norm = buf;
}
}
if (strglobmatch(norm, name)) {
found++;
if (syms && found < probe_conf.max_probes)