[PATCH 3/5] perf annotate: don't pipe objdump output through grep

Ian Rogers
2019-10-10T18:37:17Z

Simplify the objdump command by not piping the output of objdump through
grep. Instead, drop lines that match the grep pattern during the reading
loop.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/util/annotate.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index fc12c5cfe112..0a7a6f3c55f4 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1894,7 +1894,7 @@ static int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
err = asprintf(&command,
"%s %s%s --start-address=0x%016" PRIx64
" --stop-address=0x%016" PRIx64
- " -l -d %s %s -C \"$1\" 2>/dev/null|grep -v \"$1:\"|expand",
+ " -l -d %s %s -C \"$1\" 2>/dev/null|expand",
opts->objdump_path ?: "objdump",
opts->disassembler_style ? "-M " : "",
opts->disassembler_style ?: "",
@@ -1940,9 +1940,16 @@ static int symbol__disassemble(struct symbol *sym, struct annotate_args *args)

nline = 0;
while (!feof(file)) {
+ const char *match;
+
if (getline(&line, &line_len, file) < 0 || !line)
break;

+ /* Skip lines containing "filename:" */
+ match = strstr(line, symfs_filename);
+ if (match && match[strlen(symfs_filename)] == ':')
+ continue;
+
/*
* The source code line number (lineno) needs to be kept in
* across calls to symbol__parse_objdump_line(), so that it
--
2.23.0.581.g78d2f28ef7-goog