Introduce side callbacks

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/include/side/trace.h b/include/side/trace.h
index 39da9a345def923d6f3e8ffe005ad55e0687f789..3581b75c9f3b2ea01f5f94098bff4bf7bb8c16e7 100644 (file)
--- a/include/side/trace.h
+++ b/include/side/trace.h
@@ -28,6 +28,8 @@ struct side_event_field;
 struct side_tracer_visitor_ctx;
 struct side_tracer_dynamic_struct_visitor_ctx;
 struct side_tracer_dynamic_vla_visitor_ctx;
+struct side_event_description;
+struct side_arg_dynamic_event_struct;
 
 enum side_type {
        SIDE_TYPE_BOOL,
@@ -259,6 +261,24 @@ enum side_event_flags {
        SIDE_EVENT_FLAG_VARIADIC = (1 << 0),
 };
 
+struct side_callback {
+       union {
+               void (*call)(const struct side_event_description *desc,
+                       const struct side_arg_vec_description *sav_desc,
+                       void *priv);
+               void (*call_variadic)(const struct side_event_description *desc,
+                       const struct side_arg_vec_description *sav_desc,
+                       const struct side_arg_dynamic_event_struct *var_struct,
+                       void *priv);
+       } u;
+       void *priv;
+};
+
+struct side_callbacks {
+       struct side_callback *cb;
+       uint32_t nr_cb;
+};
+
 struct side_event_description {
        uint32_t version;
        uint32_t *enabled;
@@ -271,6 +291,7 @@ struct side_event_description {
        const char *event_name;
        const struct side_event_field *fields;
        const struct side_attr *attr;
+       struct side_callbacks *callbacks;
 };
 
 struct side_arg_dynamic_vec_vla {
@@ -957,6 +978,7 @@ struct side_tracer_dynamic_vla_visitor_ctx {
 
 #define _side_define_event(_identifier, _provider, _event, _loglevel, _fields, _attr, _flags) \
        uint32_t _identifier##_enabled __attribute__((section("side_event_enable"))); \
+       struct side_callbacks _identifier##_callbacks __attribute__((section("side_event_callbacks"))); \
        const struct side_event_description _identifier = { \
                .version = 0, \
                .enabled = &(_identifier##_enabled), \
@@ -968,6 +990,7 @@ struct side_tracer_dynamic_vla_visitor_ctx {
                .event_name = _event, \
                .fields = _fields, \
                .attr = _attr, \
+               .callbacks = &(_identifier##_callbacks), \
        }; \
        const struct side_event_description *_identifier##_ptr \
                __attribute__((section("side_event_description"), used)) = &(_identifier);