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 <lttng/event-expr.h>
  13
  14 struct lttng_event_expr {
  15         enum lttng_event_expr_type type;
  16 };
  17
  18 /*
  19  * `LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD` and
  20  * `LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD`.
  21  */
  22 struct lttng_event_expr_field {
  23         struct lttng_event_expr parent;
  24         char *name;
  25 };
  26
  27 /* `LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD` */
  28 struct lttng_event_expr_app_specific_context_field {
  29         struct lttng_event_expr parent;
  30         char *provider_name;
  31         char *type_name;
  32 };
  33
  34 /* `LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT` */
  35 struct lttng_event_expr_array_field_element {
  36         struct lttng_event_expr parent;
  37
  38         /* Owned by this */
  39         struct lttng_event_expr *array_field_expr;
  40
  41         unsigned int index;
  42 };
  43
  44 /*
  45  * Returns whether or not `expr` is an l-value (locator value).
  46  */
  47 static inline
  48 bool lttng_event_expr_is_lvalue(const struct lttng_event_expr *expr)
  49 {
  50         assert(expr);
  51         return expr->type == LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD ||
  52                         expr->type == LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD ||
  53                         expr->type == LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD ||
  54                         expr->type == LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT;
  55 }
  56
  57 #endif /* LTTNG_EVENT_EXPR_INTERNAL_H */