X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=include%2Flttng%2Fevent-field-value-internal.hpp;fp=include%2Flttng%2Fevent-field-value-internal.hpp;h=03ef8960b2d509b9ccd5c85c598195a192ab7ff3;hp=0000000000000000000000000000000000000000;hb=c9e313bc594f40a86eed237dce222c0fc99c957f;hpb=4878de5c7deb512bbdac4fdfc498907efa06fb7c

diff --git a/include/lttng/event-field-value-internal.hpp b/include/lttng/event-field-value-internal.hpp
new file mode 100644
index 000000000..03ef8960b
--- /dev/null
+++ b/include/lttng/event-field-value-internal.hpp
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2020 Philippe Proulx <pproulx@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#ifndef LTTNG_EVENT_FIELD_VALUE_INTERNAL_H
+#define LTTNG_EVENT_FIELD_VALUE_INTERNAL_H
+
+#include <stdint.h>
+#include <lttng/event-field-value.h>
+#include <common/dynamic-array.hpp>
+
+struct lttng_event_field_value {
+	enum lttng_event_field_value_type type;
+};
+
+/*
+ * `LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_INT`.
+ */
+struct lttng_event_field_value_uint {
+	struct lttng_event_field_value parent;
+	uint64_t val;
+};
+
+/*
+ * `LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_INT`.
+ */
+struct lttng_event_field_value_int {
+	struct lttng_event_field_value parent;
+	int64_t val;
+};
+
+/*
+ * `LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_ENUM` and
+ * `LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_ENUM` (base).
+ */
+struct lttng_event_field_value_enum {
+	struct lttng_event_field_value parent;
+
+	/*
+	 * Array of `char *` (owned by this).
+	 */
+	struct lttng_dynamic_pointer_array labels;
+};
+
+/*
+ * `LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_ENUM`.
+ */
+struct lttng_event_field_value_enum_uint {
+	struct lttng_event_field_value_enum parent;
+	uint64_t val;
+};
+
+/*
+ * `LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_ENUM`.
+ */
+struct lttng_event_field_value_enum_int {
+	struct lttng_event_field_value_enum parent;
+	int64_t val;
+};
+
+/* `LTTNG_EVENT_FIELD_VALUE_TYPE_REAL` */
+struct lttng_event_field_value_real {
+	struct lttng_event_field_value parent;
+	double val;
+};
+
+/* `LTTNG_EVENT_FIELD_VALUE_TYPE_STRING` */
+struct lttng_event_field_value_string {
+	struct lttng_event_field_value parent;
+
+	/* Owned by this */
+	char *val;
+};
+
+/* `LTTNG_EVENT_FIELD_VALUE_TYPE_STRING` */
+struct lttng_event_field_value_array {
+	struct lttng_event_field_value parent;
+
+	/*
+	 * Array of `struct lttng_event_field_value *` (owned by this).
+	 *
+	 * A `NULL` element means it's unavailable
+	 * (`LTTNG_EVENT_FIELD_VALUE_STATUS_UNAVAILABLE` status).
+	 */
+	struct lttng_dynamic_pointer_array elems;
+};
+
+/*
+ * This is internal since the session daemon knows nothing about the
+ * enumeration fields produced by the kernel tracer. Indeed, the kernel tracer
+ * manages its own metadata which remains opaque to the rest of the toolchain.
+ *
+ * Enumerations could be supported for the user space tracer, but it is not the
+ * case right now.
+ */
+
+/*
+ * Sets `*count` to the number of labels of the enumeration event field
+ * value `field_val`.
+ *
+ * Returns:
+ *
+ * `LTTNG_EVENT_FIELD_VALUE_STATUS_OK`:
+ *     Success.
+ *
+ * `LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID`:
+ *     * `field_val` is `NULL`.
+ *     * The type of `field_val` is not
+ *       `LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_ENUM` or
+ *       `LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_ENUM`.
+ *     * `count` is `NULL`.
+ */
+enum lttng_event_field_value_status
+lttng_event_field_value_enum_get_label_count(
+		const struct lttng_event_field_value *field_val,
+		unsigned int *count);
+
+/*
+ * Returns the label at index `index` of the enumeration event field
+ * value `field_val`, or `NULL` if:
+ *
+ * * `field_val` is `NULL`.
+ * * The type of `field_val` is not
+ *   `LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_ENUM` or
+ *   `LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_ENUM`.
+ * * `index` is greater than or equal to the label count of `field_val`,
+ *   as returned by lttng_event_field_value_enum_get_label_count().
+ */
+const char *lttng_event_field_value_enum_get_label_at_index(
+		const struct lttng_event_field_value *field_val,
+		unsigned int index);
+
+struct lttng_event_field_value *lttng_event_field_value_uint_create(
+		uint64_t val);
+
+struct lttng_event_field_value *lttng_event_field_value_int_create(
+		int64_t val);
+
+struct lttng_event_field_value *lttng_event_field_value_enum_uint_create(
+		uint64_t val);
+
+struct lttng_event_field_value *lttng_event_field_value_enum_int_create(
+		int64_t val);
+
+struct lttng_event_field_value *lttng_event_field_value_real_create(double val);
+
+struct lttng_event_field_value *lttng_event_field_value_string_create(
+		const char *val);
+
+struct lttng_event_field_value *lttng_event_field_value_string_create_with_size(
+		const char *val, size_t size);
+
+struct lttng_event_field_value *lttng_event_field_value_array_create(void);
+
+int lttng_event_field_value_enum_append_label(
+		struct lttng_event_field_value *field_val, const char *label);
+
+int lttng_event_field_value_enum_append_label_with_size(
+		struct lttng_event_field_value *field_val, const char *label,
+		size_t size);
+
+int lttng_event_field_value_array_append(
+		struct lttng_event_field_value *array_field_val,
+		struct lttng_event_field_value *field_val);
+
+int lttng_event_field_value_array_append_unavailable(
+		struct lttng_event_field_value *array_field_val);
+
+void lttng_event_field_value_destroy(struct lttng_event_field_value *field_val);
+
+#endif /* LTTNG_EVENT_FIELD_VALUE_INTERNAL_H */