linux-kernel - [PATCH] perf report: Add --no-demangle option

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Date:	Mon, 25 Mar 2013 18:08:56 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>, wcohen@...hat.com
Subject: [PATCH] perf report: Add --no-demangle option

From: Namhyung Kim <namhyung.kim@....com>

It's sometimes useful to see undemangled raw symbol name for example
other tools using the perf output to do manipulation of binaries.

Suggested-by: William Cohen <wcohen@...hat.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-report.c  | 2 ++
 tools/perf/util/symbol-elf.c | 9 ++++++---
 tools/perf/util/symbol.c     | 1 +
 tools/perf/util/symbol.h     | 3 ++-
 4 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 296bd219977a..b5ea26cc7eb1 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -692,6 +692,8 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
 		    "use branch records for histogram filling", parse_branch_mode),
 	OPT_STRING(0, "objdump", &objdump_path, "path",
 		   "objdump binary to use for disassembly and annotations"),
+	OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
+		    "Disable symbol demangling"),
 	OPT_END()
 	};
 
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 54efcb5659ac..4b12bf850325 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -806,9 +806,12 @@ int dso__load_sym(struct dso *dso, struct map *map,
 		 * DWARF DW_compile_unit has this, but we don't always have access
 		 * to it...
 		 */
-		demangled = bfd_demangle(NULL, elf_name, DMGL_PARAMS | DMGL_ANSI);
-		if (demangled != NULL)
-			elf_name = demangled;
+		if (symbol_conf.demangle) {
+			demangled = bfd_demangle(NULL, elf_name,
+						 DMGL_PARAMS | DMGL_ANSI);
+			if (demangled != NULL)
+				elf_name = demangled;
+		}
 new_symbol:
 		f = symbol__new(sym.st_value, sym.st_size,
 				GELF_ST_BIND(sym.st_info), elf_name);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index e6432d85b43d..8cf3b5426a9a 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -36,6 +36,7 @@ struct symbol_conf symbol_conf = {
 	.use_modules	  = true,
 	.try_vmlinux_path = true,
 	.annotate_src	  = true,
+	.demangle	  = true,
 	.symfs            = "",
 };
 
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index b62ca37c4b77..d7654c23861a 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -97,7 +97,8 @@ struct symbol_conf {
 			kptr_restrict,
 			annotate_asm_raw,
 			annotate_src,
-			event_group;
+			event_group,
+			demangle;
 	const char	*vmlinux_name,
 			*kallsyms_name,
 			*source_prefix,
-- 
1.7.11.7

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