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Date: Mon, 14 May 2018 12:19:38 +0800
From: Holger Freyther <automatic+kernel@...yther.de>
To: linux-kernel@...r.kernel.org
Cc: Holger Hans Peter Freyther <holgar+kernel@...gle.com>
Subject: [RFC 4/6] perf probe: Show variables for C++ functions
From: Holger Hans Peter Freyther <holgar+kernel@...gle.com>
The demangled C++ function name contains spaces and using the generic
argc_split would split the function in the middle. Create a separate
version that counts the number of opening and closing '<', '>' for
templated functions.
$ ./perf probe -x ./foo -V "std::vector<int, std::allocator<int> >::at"
Available variables at std::vector<int, std::allocator<int> >::at
@<at+0>
size_type __n
vector<int, std::allocator<int> >* this
Signed-off-by: Holger Hans Peter Freyther <holgar+kernel@...gle.com>
---
tools/perf/util/probe-event.c | 20 +++++++++++++--
tools/perf/util/string.c | 57 +++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/string2.h | 1 +
3 files changed, 76 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 39a2d47..97d6b6a 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1407,6 +1407,22 @@ static int parse_perf_probe_event_name(char **arg, struct perf_probe_event *pev)
return 0;
}
+/* Split the function name from @file, :line, %return but be C++ aware */
+static char *split_func_name(char *arg)
+{
+ char *ptr = arg;
+
+ while ((ptr = strpbrk_esc(ptr, ";:+@%"))) {
+ if (ptr[0] == ':' && ptr[1] == ':') {
+ ptr += 2;
+ continue;
+ }
+ return ptr;
+ }
+
+ return NULL;
+}
+
/* Parse probepoint definition. */
static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
{
@@ -1486,7 +1502,7 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
file_spec = true;
}
- ptr = strpbrk_esc(arg, ";:+@%");
+ ptr = split_func_name(arg);
if (ptr) {
nc = *ptr;
*ptr++ = '\0';
@@ -1726,7 +1742,7 @@ int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
char **argv;
int argc, i, ret = 0;
- argv = argv_split(cmd, &argc);
+ argv = argv_split_cxx(cmd, &argc);
if (!argv) {
pr_debug("Failed to split arguments.\n");
return -ENOMEM;
diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c
index d8bfd0c..bb96fe2 100644
--- a/tools/perf/util/string.c
+++ b/tools/perf/util/string.c
@@ -80,6 +80,23 @@ static const char *skip_arg(const char *cp)
return cp;
}
+static const char *skip_arg_cxx(const char *cp)
+{
+ int tmpl = 0;
+
+ while (*cp) {
+ if (tmpl == 0 && isspace(*cp))
+ break;
+ if (*cp == '<')
+ tmpl += 1;
+ if (*cp == '>')
+ tmpl -= 1;
+ cp++;
+ }
+
+ return cp;
+}
+
static int count_argc(const char *str)
{
int count = 0;
@@ -163,6 +180,46 @@ char **argv_split(const char *str, int *argcp)
return NULL;
}
+char **argv_split_cxx(const char *str, int *argcp)
+{
+ int argc = count_argc(str);
+ char **argv = calloc(argc + 1, sizeof(*argv));
+ char **argvp;
+
+ if (argv == NULL)
+ goto out;
+
+ argvp = argv;
+
+ while (*str) {
+ str = skip_sep(str);
+
+ if (*str) {
+ const char *p = str;
+ char *t;
+
+ str = skip_arg_cxx(str);
+
+ t = strndup(p, str-p);
+ if (t == NULL)
+ goto fail;
+ *argvp++ = t;
+ }
+ }
+ if (argcp)
+ *argcp = argvp - argv;
+ *argvp = NULL;
+
+out:
+ return argv;
+
+fail:
+ if (argcp)
+ *argcp = 0;
+ argv_free(argv);
+ return NULL;
+}
+
/* Character class matching */
static bool __match_charclass(const char *pat, char c, const char **npat)
{
diff --git a/tools/perf/util/string2.h b/tools/perf/util/string2.h
index 4c68a09..d32de6f 100644
--- a/tools/perf/util/string2.h
+++ b/tools/perf/util/string2.h
@@ -8,6 +8,7 @@
s64 perf_atoll(const char *str);
char **argv_split(const char *str, int *argcp);
+char **argv_split_cxx(const char *str, int *argvcp);
void argv_free(char **argv);
bool strglobmatch(const char *str, const char *pat);
bool strglobmatch_nocase(const char *str, const char *pat);
--
2.7.4
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