* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <urcu/rculist.h>
#include "lttng-filter.h"
static const char *opnames[] = {
}
static
-int apply_field_reloc(struct ltt_event *event,
+int apply_field_reloc(struct lttng_event *event,
struct bytecode_runtime *runtime,
uint32_t runtime_len,
uint32_t reloc_offset,
return -EINVAL;
/* Check if field offset is too large for 16-bit offset */
- if (field_offset > FILTER_BYTECODE_MAX_LEN)
+ if (field_offset > FILTER_BYTECODE_MAX_LEN - 1)
return -EINVAL;
/* set type */
return 0;
}
+static
+int bytecode_is_linked(struct lttng_ust_filter_bytecode_node *filter_bytecode,
+ struct lttng_event *event)
+{
+ struct lttng_bytecode_runtime *bc_runtime;
+
+ cds_list_for_each_entry(bc_runtime,
+ &event->bytecode_runtime_head, node) {
+ if (bc_runtime->bc == filter_bytecode)
+ return 1;
+ }
+ return 0;
+}
+
/*
* Take a bytecode with reloc table and link it to an event to create a
* bytecode runtime.
*/
static
-int _lttng_filter_event_link_bytecode(struct ltt_event *event,
- struct lttng_ust_filter_bytecode *filter_bytecode)
+int _lttng_filter_event_link_bytecode(struct lttng_event *event,
+ struct lttng_ust_filter_bytecode_node *filter_bytecode,
+ struct cds_list_head *insert_loc)
{
int ret, offset, next_offset;
struct bytecode_runtime *runtime = NULL;
if (!filter_bytecode)
return 0;
- /* Even is not connected to any description */
- if (!event->desc)
- return 0;
/* Bytecode already linked */
- if (event->filter || event->filter_data)
+ if (bytecode_is_linked(filter_bytecode, event))
return 0;
- dbg_printf("Linking\n");
+ dbg_printf("Linking...\n");
/* We don't need the reloc table in the runtime */
- runtime_alloc_len = sizeof(*runtime) + filter_bytecode->reloc_offset;
+ runtime_alloc_len = sizeof(*runtime) + filter_bytecode->bc.reloc_offset;
runtime = zmalloc(runtime_alloc_len);
if (!runtime) {
ret = -ENOMEM;
- goto link_error;
+ goto alloc_error;
}
- runtime->len = filter_bytecode->reloc_offset;
+ runtime->p.bc = filter_bytecode;
+ runtime->len = filter_bytecode->bc.reloc_offset;
/* copy original bytecode */
- memcpy(runtime->data, filter_bytecode->data, runtime->len);
+ memcpy(runtime->data, filter_bytecode->bc.data, runtime->len);
/*
* apply relocs. Those are a uint16_t (offset in bytecode)
* followed by a string (field name).
*/
- for (offset = filter_bytecode->reloc_offset;
- offset < filter_bytecode->len;
+ for (offset = filter_bytecode->bc.reloc_offset;
+ offset < filter_bytecode->bc.len;
offset = next_offset) {
uint16_t reloc_offset =
- *(uint16_t *) &filter_bytecode->data[offset];
+ *(uint16_t *) &filter_bytecode->bc.data[offset];
const char *field_name =
- (const char *) &filter_bytecode->data[offset + sizeof(uint16_t)];
+ (const char *) &filter_bytecode->bc.data[offset + sizeof(uint16_t)];
ret = apply_field_reloc(event, runtime, runtime->len, reloc_offset, field_name);
if (ret) {
if (ret) {
goto link_error;
}
- event->filter_data = runtime;
- event->filter = lttng_filter_interpret_bytecode;
+ runtime->p.filter = lttng_filter_interpret_bytecode;
+ runtime->p.link_failed = 0;
+ cds_list_add_rcu(&runtime->p.node, insert_loc);
+ dbg_printf("Linking successful.\n");
return 0;
link_error:
- event->filter = lttng_filter_false;
- free(runtime);
+ runtime->p.filter = lttng_filter_false;
+ runtime->p.link_failed = 1;
+ cds_list_add_rcu(&runtime->p.node, insert_loc);
+alloc_error:
+ dbg_printf("Linking failed.\n");
return ret;
}
-void lttng_filter_event_link_bytecode(struct ltt_event *event,
- struct lttng_ust_filter_bytecode *filter_bytecode)
+void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime)
{
- int ret;
+ struct lttng_ust_filter_bytecode_node *bc = runtime->bc;
- ret = _lttng_filter_event_link_bytecode(event, filter_bytecode);
- if (ret) {
- fprintf(stderr, "[lttng filter] error linking event bytecode\n");
- }
+ if (!bc->enabler->enabled || runtime->link_failed)
+ runtime->filter = lttng_filter_false;
+ else
+ runtime->filter = lttng_filter_interpret_bytecode;
}
/*
- * Link bytecode to all events for a wildcard. Skips events that already
- * have a bytecode linked.
- * We do not set each event's filter_bytecode field, because they do not
- * own the filter_bytecode: the wildcard owns it.
+ * Link bytecode for all enablers referenced by an event.
*/
-void lttng_filter_wildcard_link_bytecode(struct session_wildcard *wildcard)
+void lttng_enabler_event_link_bytecode(struct lttng_event *event,
+ struct lttng_enabler *enabler)
{
- struct ltt_event *event;
- int ret;
-
- if (!wildcard->filter_bytecode)
- return;
-
- cds_list_for_each_entry(event, &wildcard->events, wildcard_list) {
- if (event->filter)
+ struct lttng_ust_filter_bytecode_node *bc;
+ struct lttng_bytecode_runtime *runtime;
+
+ /* Can only be called for events with desc attached */
+ assert(event->desc);
+
+ /* Link each bytecode. */
+ cds_list_for_each_entry(bc, &enabler->filter_bytecode_head, node) {
+ int found = 0, ret;
+ struct cds_list_head *insert_loc;
+
+ cds_list_for_each_entry(runtime,
+ &event->bytecode_runtime_head, node) {
+ if (runtime->bc == bc) {
+ found = 1;
+ break;
+ }
+ }
+ /* Skip bytecode already linked */
+ if (found)
continue;
- ret = _lttng_filter_event_link_bytecode(event,
- wildcard->filter_bytecode);
+
+ /*
+ * Insert at specified priority (seqnum) in increasing
+ * order.
+ */
+ cds_list_for_each_entry_reverse(runtime,
+ &event->bytecode_runtime_head, node) {
+ if (runtime->bc->bc.seqnum < bc->bc.seqnum) {
+ /* insert here */
+ insert_loc = &runtime->node;
+ goto add_within;
+ }
+ }
+ /* Add to head to list */
+ insert_loc = &event->bytecode_runtime_head;
+ add_within:
+ dbg_printf("linking bytecode\n");
+ ret = _lttng_filter_event_link_bytecode(event, bc,
+ insert_loc);
if (ret) {
- fprintf(stderr, "[lttng filter] error linking wildcard bytecode\n");
+ dbg_printf("[lttng filter] warning: cannot link event bytecode\n");
}
-
}
- return;
}
/*
- * Need to attach filter to an event before starting tracing for the
- * session. We own the filter_bytecode if we return success.
+ * We own the filter_bytecode if we return success.
*/
-int lttng_filter_event_attach_bytecode(struct ltt_event *event,
- struct lttng_ust_filter_bytecode *filter_bytecode)
+int lttng_filter_enabler_attach_bytecode(struct lttng_enabler *enabler,
+ struct lttng_ust_filter_bytecode_node *filter_bytecode)
{
- if (event->chan->session->been_active)
- return -EPERM;
- if (event->filter_bytecode)
- return -EEXIST;
- event->filter_bytecode = filter_bytecode;
+ cds_list_add(&filter_bytecode->node, &enabler->filter_bytecode_head);
return 0;
}
-/*
- * Need to attach filter to a wildcard before starting tracing for the
- * session. We own the filter_bytecode if we return success.
- */
-int lttng_filter_wildcard_attach_bytecode(struct session_wildcard *wildcard,
- struct lttng_ust_filter_bytecode *filter_bytecode)
+void lttng_free_enabler_filter_bytecode(struct lttng_enabler *enabler)
{
- if (wildcard->chan->session->been_active)
- return -EPERM;
- if (wildcard->filter_bytecode)
- return -EEXIST;
- wildcard->filter_bytecode = filter_bytecode;
- return 0;
+ struct lttng_ust_filter_bytecode_node *filter_bytecode, *tmp;
+
+ cds_list_for_each_entry_safe(filter_bytecode, tmp,
+ &enabler->filter_bytecode_head, node) {
+ free(filter_bytecode);
+ }
+}
+
+void lttng_free_event_filter_runtime(struct lttng_event *event)
+{
+ struct bytecode_runtime *runtime, *tmp;
+
+ cds_list_for_each_entry_safe(runtime, tmp,
+ &event->bytecode_runtime_head, p.node) {
+ free(runtime);
+ }
}
projects / lttng-ust.git / blobdiff