SoW-2020-0002: Trace Hit Counters: trigger error reporting integration

[lttng-tools.git] / include / lttng / event-expr-internal.h

diff --git a/include/lttng/event-expr-internal.h b/include/lttng/event-expr-internal.h
new file mode 100644 (file)
index 0000000..8c87781
--- /dev/null
+++ b/include/lttng/event-expr-internal.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2020 Philippe Proulx <pproulx@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#ifndef LTTNG_EVENT_EXPR_INTERNAL_H
+#define LTTNG_EVENT_EXPR_INTERNAL_H
+
+#include <assert.h>
+#include <common/macros.h>
+#include <lttng/event-expr.h>
+#include <urcu/ref.h>
+
+struct lttng_event_expr {
+       struct urcu_ref ref;
+       enum lttng_event_expr_type type;
+};
+
+/*
+ * `LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD` and
+ * `LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD`.
+ */
+struct lttng_event_expr_field {
+       struct lttng_event_expr parent;
+       char *name;
+};
+
+/* `LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD` */
+struct lttng_event_expr_app_specific_context_field {
+       struct lttng_event_expr parent;
+       char *provider_name;
+       char *type_name;
+};
+
+/* `LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT` */
+struct lttng_event_expr_array_field_element {
+       struct lttng_event_expr parent;
+
+       /* Owned by this */
+       struct lttng_event_expr *array_field_expr;
+
+       unsigned int index;
+};
+
+/*
+ * Returns whether or not `expr` is an l-value (locator value).
+ */
+static inline
+bool lttng_event_expr_is_lvalue(const struct lttng_event_expr *expr)
+{
+       assert(expr);
+       return expr->type == LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD ||
+                       expr->type == LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD ||
+                       expr->type == LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD ||
+                       expr->type == LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT;
+}
+
+LTTNG_HIDDEN
+void lttng_event_expr_get(struct lttng_event_expr *expr);
+
+LTTNG_HIDDEN
+void lttng_event_expr_put(struct lttng_event_expr *expr);
+
+#endif /* LTTNG_EVENT_EXPR_INTERNAL_H */