linux-kernel - [PATCH v2 11/12] perf tools: add NO_BACKTRACE for application self-debugging

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Date:	Sat,  8 Sep 2012 03:43:23 +0300
From:	Irina Tirdea <irina.tirdea@...il.com>
To:	mingo@...hat.com, acme@...stprotocols.net, a.p.zijlstra@...llo.nl,
	rostedt@...dmis.org
Cc:	paulus@...ba.org, dsahern@...il.com, namhyung.kim@....com,
	linux-kernel@...r.kernel.org, Irina Tirdea <irina.tirdea@...el.com>
Subject: [PATCH v2 11/12] perf tools: add NO_BACKTRACE for application self-debugging

From: Irina Tirdea <irina.tirdea@...el.com>

perf has support for self-debugging by defining dump_stack function. This
function uses backtrace and backtrace_symbols functions defined as GNU
extensions.

In Android, bionic does not offer support for these functions and compilation
will fail with the following error:
target  C: libperf <= tools/perf/util/util.c
tools/perf/util/util.c:4:22: fatal error: execinfo.h: No such file or directory
compilation terminated.

Add a compile-time option (NO_BACKTRACE) to enable or disable self-debugging
functionality in perf. This can also help in debugging since it offers the
possibility to turn on/off printing the backtrace.

Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
---
 tools/perf/Makefile                 |    8 ++++++++
 tools/perf/config/feature-tests.mak |   14 ++++++++++++++
 tools/perf/util/util.c              |    6 ++++++
 3 files changed, 28 insertions(+)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 25d2bab..c0d2ce3 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -756,6 +756,14 @@ else
 	endif
 endif
 
+ifdef NO_BACKTRACE
+       BASIC_CFLAGS += -DNO_BACKTRACE
+else
+       ifneq ($(call try-cc,$(SOURCE_BACKTRACE),),y)
+               BASIC_CFLAGS += -DNO_BACKTRACE
+       endif
+endif
+
 ifdef ASCIIDOC8
 	export ASCIIDOC8
 endif
diff --git a/tools/perf/config/feature-tests.mak b/tools/perf/config/feature-tests.mak
index 2f1156a..116690a 100644
--- a/tools/perf/config/feature-tests.mak
+++ b/tools/perf/config/feature-tests.mak
@@ -179,3 +179,17 @@ int main(void)
 }
 endef
 endif
+
+ifndef NO_BACKTRACE
+define SOURCE_BACKTRACE
+#include <execinfo.h>
+#include <stdio.h>
+
+int main(void)
+{
+	backtrace(NULL, 0);
+	backtrace_symbols(NULL, 0);
+	return 0;
+}
+endef
+endif
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 1b8775c..2055cf3 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -1,7 +1,9 @@
 #include "../perf.h"
 #include "util.h"
 #include <sys/mman.h>
+#ifndef NO_BACKTRACE
 #include <execinfo.h>
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -163,6 +165,7 @@ size_t hex_width(u64 v)
 }
 
 /* Obtain a backtrace and print it to stdout. */
+#ifndef NO_BACKTRACE
 void dump_stack(void)
 {
 	void *array[16];
@@ -177,3 +180,6 @@ void dump_stack(void)
 
 	free(strings);
 }
+#else
+void dump_stack(void) {}
+#endif
-- 
1.7.9.5

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