Add base support for event rule hit
[lttng-tools.git] / src / common / userspace-probe.c
index 609ffc1ac22874cb5d944a2ced6adcc0cf07e2b2..a1a4d1fb3f3f14a82fefee7c4746773339397be4 100644 (file)
@@ -12,6 +12,8 @@
 #include <common/macros.h>
 #include <common/payload.h>
 #include <common/payload-view.h>
+#include <common/hashtable/hashtable.h>
+#include <common/hashtable/utils.h>
 #include <fcntl.h>
 #include <lttng/constant.h>
 #include <lttng/userspace-probe-internal.h>
@@ -199,6 +201,25 @@ end:
        return is_equal;
 }
 
+static unsigned long lttng_userspace_probe_location_function_hash(
+               const struct lttng_userspace_probe_location *location)
+{
+       unsigned long hash = hash_key_ulong(
+                       (void *) LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION,
+                       lttng_ht_seed);
+       struct lttng_userspace_probe_location_function *function_location =
+                       container_of(location, typeof(*function_location),
+                                       parent);
+
+       hash ^= hash_key_str(function_location->function_name, lttng_ht_seed);
+       hash ^= hash_key_str(function_location->binary_path, lttng_ht_seed);
+       /*
+        * No need to hash on the fd. Worst comes to worse,
+        * the equal function will discriminate.
+        */
+       return hash;
+}
+
 static bool lttng_userspace_probe_location_function_is_equal(
                const struct lttng_userspace_probe_location *_a,
                const struct lttng_userspace_probe_location *_b)
@@ -290,6 +311,7 @@ lttng_userspace_probe_location_function_create_no_check(const char *binary_path,
        ret->lookup_method = lookup_method;
        ret->type = LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION;
        ret->equal = lttng_userspace_probe_location_function_is_equal;
+       ret->hash = lttng_userspace_probe_location_function_hash;
        goto end;
 
 error:
@@ -305,6 +327,25 @@ end:
        return ret;
 }
 
+static unsigned long lttng_userspace_probe_location_tracepoint_hash(
+               const struct lttng_userspace_probe_location *location)
+{
+       unsigned long hash = hash_key_ulong(
+                       (void *) LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT,
+                       lttng_ht_seed);
+       struct lttng_userspace_probe_location_tracepoint *tp_location =
+                       container_of(location, typeof(*tp_location), parent);
+
+       hash ^= hash_key_str(tp_location->probe_name, lttng_ht_seed);
+       hash ^= hash_key_str(tp_location->provider_name, lttng_ht_seed);
+       hash ^= hash_key_str(tp_location->binary_path, lttng_ht_seed);
+       /*
+        * No need to hash on the fd. Worst comes to worse,
+        * the equal function will discriminate.
+        */
+       return hash;
+}
+
 static bool lttng_userspace_probe_location_tracepoint_is_equal(
                const struct lttng_userspace_probe_location *_a,
                const struct lttng_userspace_probe_location *_b)
@@ -406,6 +447,7 @@ lttng_userspace_probe_location_tracepoint_create_no_check(const char *binary_pat
        ret->lookup_method = lookup_method;
        ret->type = LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT;
        ret->equal = lttng_userspace_probe_location_tracepoint_is_equal;
+       ret->hash = lttng_userspace_probe_location_tracepoint_hash;
        goto end;
 
 error:
@@ -1916,3 +1958,10 @@ bool lttng_userspace_probe_location_is_equal(
 end:
        return is_equal;
 }
+
+LTTNG_HIDDEN
+unsigned long lttng_userspace_probe_location_hash(
+               const struct lttng_userspace_probe_location *location)
+{
+       return location->hash(location);
+}
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