linux-kernel - [tip:perf/core] perf annotate: More exactly grep -v of the objdump command

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Message-ID: <tip-e7cb9de211ebb2924d87fdeb77e50d74c2e673d1@git.kernel.org>
Date:   Fri, 24 Mar 2017 11:45:54 -0700
From:   tip-bot for Taeung Song <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, peterz@...radead.org, mhiramat@...nel.org,
        namhyung@...nel.org, linux-kernel@...r.kernel.org,
        mingo@...nel.org, wangnan0@...wei.com, tglx@...utronix.de,
        acme@...hat.com, treeze.taeung@...il.com, jolsa@...nel.org
Subject: [tip:perf/core] perf annotate: More exactly grep -v of the objdump
 command

Commit-ID:  e7cb9de211ebb2924d87fdeb77e50d74c2e673d1
Gitweb:     http://git.kernel.org/tip/e7cb9de211ebb2924d87fdeb77e50d74c2e673d1
Author:     Taeung Song <treeze.taeung@...il.com>
AuthorDate: Mon, 20 Mar 2017 11:56:57 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 21 Mar 2017 15:42:25 -0300

perf annotate: More exactly grep -v of the objdump command

The 'grep -v "filename"' applied to the objdump command output cause a
side effect eliminating filename:linenr of output of 'objdump -l' if the
object file name and source file name are the same, fix it.

E.g. the output of the following objdump command in symbol__disassemble():

    $ objdump -l -d -S -C /home/taeung/hello --start-address=...

    /home/taeung/hello:     file format elf64-x86-64

    Disassembly of section .text:

    0000000000400526 <main>:
    main():
    /home/taeung/hello.c:4

    void main()
    {
      400526:	55                   	push   %rbp
      400527:	48 89 e5             	mov    %rsp,%rbp
    /home/taeung/hello.c:5
    ...

But it uses grep -v "filename" e.g. "/home/taeung/hello" in the objdump
command to remove the first line containing file name and file format
("/home/taeung/hello:     file format elf64-x86-64"):

Before:

    $ objdump -l -d -S -C /home/taeung/hello | grep /home/taeung/hello

But this causes a side effect, removing filename:linenr too, because the
object file and source file have the same name e.g. "/home/taueng/hello",
"/home/taeung/hello.c"

So more do a better match by using grep -v as below to correctly remove
that first line:

    "/home/taeung/hello:     file format elf64-x86-64"

After:

    $ objdump -l -d -S -C /home/taeung/hello | grep /home/taeung/hello:

Signed-off-by: Taeung Song <treeze.taeung@...il.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/1489978617-31396-5-git-send-email-treeze.taeung@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/annotate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 273f21f..4d325cd 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1435,7 +1435,7 @@ int symbol__disassemble(struct symbol *sym, struct map *map, const char *arch_na
 	snprintf(command, sizeof(command),
 		 "%s %s%s --start-address=0x%016" PRIx64
 		 " --stop-address=0x%016" PRIx64
-		 " -l -d %s %s -C %s 2>/dev/null|grep -v %s|expand",
+		 " -l -d %s %s -C %s 2>/dev/null|grep -v %s:|expand",
 		 objdump_path ? objdump_path : "objdump",
 		 disassembler_style ? "-M " : "",
 		 disassembler_style ? disassembler_style : "",