[PATCH 09/10] perf tools: Compute other metrics

[Jiri Olsa]

Adding computation (expr__parse call) of 'other' metric at
the point when it needs to be resolved during the 'master'
metric computation.

Once the inner metric is computed, the result is stored and
used if there's another usage of that metric.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
 tools/perf/util/expr.c |  3 +++
 tools/perf/util/expr.h |  1 +
 tools/perf/util/expr.y | 20 +++++++++++++++++++-
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
index 32f7acac7c19..1b6d550cec5f 100644
--- a/tools/perf/util/expr.c
+++ b/tools/perf/util/expr.c
@@ -91,6 +91,7 @@ int expr__add_other(struct expr_parse_ctx *ctx, struct metric_other *other)
 
 	data_ptr->other.metric_name = other->metric_name;
 	data_ptr->other.metric_expr = other->metric_expr;
+	data_ptr->other.counted = false;
 	data_ptr->is_other = true;
 
 	ret = hashmap__set(&ctx->ids, name, data_ptr,
@@ -150,6 +151,8 @@ __expr__parse(double *val, struct expr_parse_ctx *ctx, const char *expr,
 	void *scanner;
 	int ret;
 
+	pr_debug2("parsing metric: %s\n", expr);
+
 	ret = expr_lex_init_extra(&scanner_ctx, &scanner);
 	if (ret)
 		return ret;
diff --git a/tools/perf/util/expr.h b/tools/perf/util/expr.h
index ed60f9227b43..f85f3941eda5 100644
--- a/tools/perf/util/expr.h
+++ b/tools/perf/util/expr.h
@@ -25,6 +25,7 @@ struct expr_parse_data {
 		struct {
 			const char *metric_name;
 			const char *metric_expr;
+			bool counted;
 		} other;
 	};
 };
diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
index 6252d9f6cfc8..cca423331f65 100644
--- a/tools/perf/util/expr.y
+++ b/tools/perf/util/expr.y
@@ -89,12 +89,30 @@ if_expr:
 expr:	  NUMBER
 	| ID			{
 					struct expr_parse_data *data;
+					char *lookup = $1;
+					const char *name;
 
-					if (expr__get_id(ctx, $1, &data) || !data) {
+					if (expr__is_metric($1, &name))
+						lookup = name;
+
+					if (expr__get_id(ctx, lookup, &data) || !data) {
 						pr_debug("%s not found\n", $1);
 						free($1);
 						YYABORT;
 					}
+
+					pr_debug2("lookup: is_other %d, counted %d: %s\n",
+						  data->is_other, data->other.counted, lookup);
+
+					if (data->is_other && !data->other.counted) {
+						data->other.counted = true;
+						if (expr__parse(&data->val, ctx, data->other.metric_expr, 1)) {
+							pr_debug("%s failed to count\n", $1);
+							free($1);
+							YYABORT;
+						}
+					}
+
 					$$ = data->val;
 					free($1);
 				}
-- 
2.25.4