[PATCH v4 2/8] perf header: Add utility to convert feature number to a string

[Ian Rogers <irogers@google.com>]

For logging and debug messages it can be convenient to convert a
feature number to a name. Add header_feat__name for this and reuse the
data already within the feat_ops struct.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/header.c | 7 +++++++
 tools/perf/util/header.h | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 9142a8ba4019..fcd53271e189 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -3770,6 +3770,13 @@ struct header_print_data {
 	bool full; /* extended list of headers */
 };
 
+const char *header_feat__name(unsigned int id)
+{
+	if (id < HEADER_LAST_FEATURE)
+		return feat_ops[id].name ?: "INVALID";
+	return "INVALID";
+}
+
 static int perf_file_section__fprintf_info(struct perf_file_section *section,
 					   struct perf_header *ph,
 					   int feat, int fd, void *data)
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index cc40ac796f52..ca22030a1434 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -132,6 +132,8 @@ struct perf_header_feature_ops {
 
 extern const char perf_version_string[];
 
+const char *header_feat__name(unsigned int id);
+
 int perf_session__read_header(struct perf_session *session);
 int perf_session__write_header(struct perf_session *session,
 			       struct evlist *evlist,
-- 
2.53.0.1118.gaef5881109-goog