From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932594AbbI3QsX (ORCPT ); Wed, 30 Sep 2015 12:48:23 -0400 Received: from mail7.hitachi.co.jp ([133.145.228.42]:58148 "EHLO mail7.hitachi.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932434AbbI3QsE (ORCPT ); Wed, 30 Sep 2015 12:48:04 -0400 X-AuditID: 85900ec0-9c3c7b9000001a57-ca-560c1169983e Subject: [PATCH perf/core 5/5] perf-probe: Improve error message when %return is on inlined function From: Masami Hiramatsu To: Arnaldo Carvalho de Melo Cc: Namhyung Kim , linux-kernel@vger.kernel.org, Jiri Olsa , Wang Nan Date: Thu, 01 Oct 2015 01:41:37 +0900 Message-ID: <20150930164137.3733.55055.stgit@localhost.localdomain> In-Reply-To: <20150930164126.3733.47708.stgit@localhost.localdomain> References: <20150930164126.3733.47708.stgit@localhost.localdomain> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org perf probe shows more precisely message when it finds given %return target function is inlined. Without this fix: ---- # ./perf probe -V getname_flags%return Return probe must be on the head of a real function. Debuginfo analysis failed. Error: Failed to show vars. ---- With this fix: ---- # ./perf probe -V getname_flags%return Failed to find "getname_flags%return", because getname_flags is an inlined function and has no return point. Debuginfo analysis failed. Error: Failed to show vars. ---- Signed-off-by: Masami Hiramatsu Suggested-by: Arnaldo Carvalho de Melo --- tools/perf/util/probe-finder.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index f0708ff..bd8f03d 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -594,6 +594,7 @@ static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) /* Convert subprogram DIE to trace point */ static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, Dwarf_Addr paddr, bool retprobe, + const char *function, struct probe_trace_point *tp) { Dwarf_Addr eaddr, highaddr; @@ -637,8 +638,10 @@ static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, /* Return probe must be on the head of a subprogram */ if (retprobe) { if (eaddr != paddr) { - pr_warning("Return probe must be on the head of" - " a real function.\n"); + pr_warning("Failed to find \"%s%%return\",\n" + " because %s is an inlined function and" + " has no return point.\n", function, + function); return -EINVAL; } tp->retprobe = true; @@ -1178,6 +1181,7 @@ static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) { struct trace_event_finder *tf = container_of(pf, struct trace_event_finder, pf); + struct perf_probe_point *pp = &pf->pev->point; struct probe_trace_event *tev; struct perf_probe_arg *args; int ret, i; @@ -1192,7 +1196,7 @@ static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) /* Trace point should be converted from subprogram DIE */ ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr, - pf->pev->point.retprobe, &tev->point); + pp->retprobe, pp->function, &tev->point); if (ret < 0) return ret; @@ -1322,6 +1326,7 @@ static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) { struct available_var_finder *af = container_of(pf, struct available_var_finder, pf); + struct perf_probe_point *pp = &pf->pev->point; struct variable_list *vl; Dwarf_Die die_mem; int ret; @@ -1335,7 +1340,7 @@ static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) /* Trace point should be converted from subprogram DIE */ ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr, - pf->pev->point.retprobe, &vl->point); + pp->retprobe, pp->function, &vl->point); if (ret < 0) return ret;