[lttng-dev] [Patch LTTng-ust 1/7] Add or update data structures to support CTF named metadata

[Geneviève Bastien]

The structures match those in LTTng-tools to support named metadata in general
and CTF enumerations in particular.

Signed-off-by: Geneviève Bastien <gbastien+lttng at versatic.net>
---
 include/lttng/ust-ctl.h    | 36 +++++++++++++++++++++++++++++++++++-
 include/lttng/ust-events.h | 20 +++++++++++++++++++-
 2 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/include/lttng/ust-ctl.h b/include/lttng/ust-ctl.h
index 40e831e..29c89fe 100644
--- a/include/lttng/ust-ctl.h
+++ b/include/lttng/ust-ctl.h
@@ -295,13 +295,23 @@ struct ustctl_float_type {
 	char padding[USTCTL_UST_FLOAT_TYPE_PADDING];
 } LTTNG_PACKED;
 
-#define USTCTL_UST_BASIC_TYPE_PADDING	296
+#define USTCTL_UST_ENUM_ENTRY_PADDING	296
+struct ustctl_enum_entry {
+	unsigned long long start, end;	/* start and end are inclusive */
+	char string[LTTNG_UST_SYM_NAME_LEN];
+	char padding[USTCTL_UST_ENUM_ENTRY_PADDING];
+};
+
+#define USTCTL_UST_BASIC_TYPE_PADDING	40
 union _ustctl_basic_type {
 	struct ustctl_integer_type integer;
 	struct {
 		enum ustctl_string_encodings encoding;
 	} string;
 	struct ustctl_float_type _float;
+	struct {
+		char name[LTTNG_UST_SYM_NAME_LEN];
+	} enumeration;
 	char padding[USTCTL_UST_BASIC_TYPE_PADDING];
 } LTTNG_PACKED;
 
@@ -329,6 +339,30 @@ struct ustctl_type {
 	} u;
 } LTTNG_PACKED;
 
+#define USTCTL_UST_ENUM_TYPE_PADDING	296
+struct ustctl_enum {
+	char name[LTTNG_UST_SYM_NAME_LEN];
+	struct ustctl_integer_type container_type;
+	struct ustctl_enum_entry *entries;
+	unsigned int len;
+	char padding[USTCTL_UST_ENUM_TYPE_PADDING];
+} LTTNG_PACKED;
+
+/* CTF Metadata types for named metadata described outside event descriptions */
+enum ustctl_metadata_types {
+	ustctl_mtype_enum,
+	NR_USTCTL_METADATA_TYPES,
+};
+
+#define USTCTL_UST_NAMED_METADATA_PADDING 640
+struct ustctl_named_metadata {
+	enum ustctl_metadata_types mtype;
+	union {
+		struct ustctl_enum ctf_enum;
+		char padding[USTCTL_UST_NAMED_METADATA_PADDING];
+	} u;
+};
+
 #define USTCTL_UST_FIELD_PADDING	28
 struct ustctl_field {
 	char name[LTTNG_UST_SYM_NAME_LEN];
diff --git a/include/lttng/ust-events.h b/include/lttng/ust-events.h
index d93c912..260b221 100644
--- a/include/lttng/ust-events.h
+++ b/include/lttng/ust-events.h
@@ -89,6 +89,12 @@ enum lttng_string_encodings {
 	NR_STRING_ENCODINGS,
 };
 
+/* CTF Metadata types for named metadata described outside event descriptions */
+enum lttng_metadata_types {
+	mtype_enum,
+	NR_METADATA_TYPES,
+};
+
 #define LTTNG_UST_ENUM_ENTRY_PADDING	16
 struct lttng_enum_entry {
 	unsigned long long start, end;	/* start and end are inclusive */
@@ -204,12 +210,22 @@ struct lttng_type {
 #define LTTNG_UST_ENUM_TYPE_PADDING	24
 struct lttng_enum {
 	const char *name;
-	struct lttng_type container_type;
+	struct lttng_integer_type container_type;
 	const struct lttng_enum_entry *entries;
 	unsigned int len;
 	char padding[LTTNG_UST_ENUM_TYPE_PADDING];
 };
 
+#define LTTNG_UST_NAMED_METADATA_PADDING	60
+struct lttng_named_metadata {
+	enum lttng_metadata_types mtype;
+	unsigned int nowrite; /* inherited from the field using it */
+	union {
+		const struct lttng_enum *ctf_enum;
+		char padding[LTTNG_UST_NAMED_METADATA_PADDING];
+	} u;
+};
+
 /*
  * Event field description
  *
@@ -267,6 +283,8 @@ struct lttng_event_desc {
 	union {
 		struct {
 			const char **model_emf_uri;
+			unsigned int nr_metadata;
+			const struct lttng_named_metadata *named_metadata;
 		} ext;
 		char padding[LTTNG_UST_EVENT_DESC_PADDING];
 	} u;
-- 
1.8.5.3