SoW-2020-0002: Trace Hit Counters: trigger error reporting integration
[lttng-tools.git] / include / lttng / event-expr-internal.h
1 /*
2 * Copyright (C) 2020 Philippe Proulx <pproulx@efficios.com>
3 *
4 * SPDX-License-Identifier: LGPL-2.1-only
5 *
6 */
7
8 #ifndef LTTNG_EVENT_EXPR_INTERNAL_H
9 #define LTTNG_EVENT_EXPR_INTERNAL_H
10
11 #include <assert.h>
12 #include <common/macros.h>
13 #include <lttng/event-expr.h>
14 #include <urcu/ref.h>
15
16 struct lttng_event_expr {
17 struct urcu_ref ref;
18 enum lttng_event_expr_type type;
19 };
20
21 /*
22 * `LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD` and
23 * `LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD`.
24 */
25 struct lttng_event_expr_field {
26 struct lttng_event_expr parent;
27 char *name;
28 };
29
30 /* `LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD` */
31 struct lttng_event_expr_app_specific_context_field {
32 struct lttng_event_expr parent;
33 char *provider_name;
34 char *type_name;
35 };
36
37 /* `LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT` */
38 struct lttng_event_expr_array_field_element {
39 struct lttng_event_expr parent;
40
41 /* Owned by this */
42 struct lttng_event_expr *array_field_expr;
43
44 unsigned int index;
45 };
46
47 /*
48 * Returns whether or not `expr` is an l-value (locator value).
49 */
50 static inline
51 bool lttng_event_expr_is_lvalue(const struct lttng_event_expr *expr)
52 {
53 assert(expr);
54 return expr->type == LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD ||
55 expr->type == LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD ||
56 expr->type == LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD ||
57 expr->type == LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT;
58 }
59
60 LTTNG_HIDDEN
61 void lttng_event_expr_get(struct lttng_event_expr *expr);
62
63 LTTNG_HIDDEN
64 void lttng_event_expr_put(struct lttng_event_expr *expr);
65
66 #endif /* LTTNG_EVENT_EXPR_INTERNAL_H */
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