linux-kernel - [RFC 02/12] perf event action: Add parsing const expr support

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Message-Id: <20241128133553.823722-3-yangjihong@bytedance.com>
Date: Thu, 28 Nov 2024 21:35:43 +0800
From: Yang Jihong <yangjihong@...edance.com>
To: peterz@...radead.org,
	mingo@...hat.com,
	acme@...nel.org,
	namhyung@...nel.org,
	mark.rutland@....com,
	alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org,
	irogers@...gle.com,
	adrian.hunter@...el.com,
	kan.liang@...ux.intel.com,
	james.clark@....com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: yangjihong@...edance.com
Subject: [RFC 02/12] perf event action: Add parsing const expr support

Event action requires constant expression parsing support,
which include constant integer and constant string.

Signed-off-by: Yang Jihong <yangjihong@...edance.com>
---
 tools/perf/util/parse-action.c | 27 +++++++++++++++++++++++++++
 tools/perf/util/parse-action.h |  5 +++++
 2 files changed, 32 insertions(+)

diff --git a/tools/perf/util/parse-action.c b/tools/perf/util/parse-action.c
index 01c8c7fdea59..391546bf3d73 100644
--- a/tools/perf/util/parse-action.c
+++ b/tools/perf/util/parse-action.c
@@ -4,6 +4,9 @@
  * Actions are the programs that run when the sampling event is triggered.
  * The action is a list of expressions separated by semicolons (;).
  * Each action is an expression, added to actions_head node as list_head node.
+ *
+ * Supported expressions:
+ *   - constant:
  */
 
 #include "util/debug.h"
@@ -115,7 +118,31 @@ void event_actions__free(void)
 	(void)event_actions__for_each_expr_safe(do_action_free, NULL, false);
 }
 
+static struct evtact_expr_ops *expr_const_ops_list[EVTACT_EXPR_CONST_TYPE_MAX] = {
+};
+
+static int expr_const_set_ops(struct evtact_expr *expr, u32 opcode)
+{
+	if (opcode >= EVTACT_EXPR_CONST_TYPE_MAX) {
+		pr_err("expr_const opcode invalid: %u\n", opcode);
+		return -EINVAL;
+	}
+
+	if (expr_const_ops_list[opcode] == NULL) {
+		pr_err("expr_const opcode not supported: %u\n", opcode);
+		return -ENOTSUP;
+	}
+
+	expr->ops = expr_const_ops_list[opcode];
+	return 0;
+}
+
+static struct evtact_expr_class expr_const = {
+	.set_ops = expr_const_set_ops,
+};
+
 static struct evtact_expr_class *expr_class_list[EVTACT_EXPR_TYPE_MAX] = {
+	[EVTACT_EXPR_TYPE_CONST]   = &expr_const,
 };
 
 int parse_action_expr__set_class(enum evtact_expr_type type,
diff --git a/tools/perf/util/parse-action.h b/tools/perf/util/parse-action.h
index 71a0a166959e..47bd75264dee 100644
--- a/tools/perf/util/parse-action.h
+++ b/tools/perf/util/parse-action.h
@@ -9,9 +9,14 @@
 #include "evlist.h"
 
 enum evtact_expr_type {
+	EVTACT_EXPR_TYPE_CONST,
 	EVTACT_EXPR_TYPE_MAX,
 };
 
+enum evtact_expr_const_type {
+	EVTACT_EXPR_CONST_TYPE_MAX,
+};
+
 struct evtact_expr;
 struct evtact_expr_ops {
 	int (*new)(struct evtact_expr *expr, void *data, int size);
-- 
2.25.1