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Subject[PATCH 17/21] perf expr: Add subset utility.
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Add a helper that returns true if all the IDs in needles are present in
haystack. Later this will be used in sharing events between metrics.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/util/expr.c | 15 +++++++++++++++
tools/perf/util/expr.h | 2 ++
2 files changed, 17 insertions(+)

diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
index 5657222aaa25..77c6ad81a923 100644
--- a/tools/perf/util/expr.c
+++ b/tools/perf/util/expr.c
@@ -211,6 +211,21 @@ int expr__get_id(struct expr_parse_ctx *ctx, const char *id,
return hashmap__find(ctx->ids, id, (void **)data) ? 0 : -1;
}

+bool expr__subset_of_ids(struct expr_parse_ctx *haystack,
+ struct expr_parse_ctx *needles)
+{
+ struct hashmap_entry *cur;
+ size_t bkt;
+ struct expr_id_data *data;
+
+ hashmap__for_each_entry(needles->ids, cur, bkt) {
+ if (expr__get_id(haystack, cur->key, &data))
+ return false;
+ }
+ return true;
+}
+
+
int expr__resolve_id(struct expr_parse_ctx *ctx, const char *id,
struct expr_id_data **datap)
{
diff --git a/tools/perf/util/expr.h b/tools/perf/util/expr.h
index c6e534f633c3..cf81f9166dbb 100644
--- a/tools/perf/util/expr.h
+++ b/tools/perf/util/expr.h
@@ -43,6 +43,8 @@ int expr__add_id_val(struct expr_parse_ctx *ctx, const char *id, double val);
int expr__add_ref(struct expr_parse_ctx *ctx, struct metric_ref *ref);
int expr__get_id(struct expr_parse_ctx *ctx, const char *id,
struct expr_id_data **data);
+bool expr__subset_of_ids(struct expr_parse_ctx *haystack,
+ struct expr_parse_ctx *needles);
int expr__resolve_id(struct expr_parse_ctx *ctx, const char *id,
struct expr_id_data **datap);

--
2.33.0.882.g93a45727a2-goog
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