Add base support for event rule hit

[lttng-tools.git] / src / common / kernel-probe.c

diff --git a/src/common/kernel-probe.c b/src/common/kernel-probe.c
index 27ca02c99d09ea03212bd7d1489221d17270f50c..d2637f933efa18afb243049353cdab4c089908a2 100644 (file)
--- a/src/common/kernel-probe.c
+++ b/src/common/kernel-probe.c
@@ -11,6 +11,8 @@
 #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/kernel-probe.h>
@@ -39,6 +41,14 @@ bool lttng_kernel_probe_location_symbol_is_equal(
                const struct lttng_kernel_probe_location *a,
                const struct lttng_kernel_probe_location *b);
 
+static
+unsigned long lttng_kernel_probe_location_address_hash(
+               const struct lttng_kernel_probe_location *location);
+
+static
+unsigned long lttng_kernel_probe_location_symbol_hash(
+               const struct lttng_kernel_probe_location *location);
+
 enum lttng_kernel_probe_location_type lttng_kernel_probe_location_get_type(
                const struct lttng_kernel_probe_location *location)
 {
@@ -109,6 +119,7 @@ lttng_kernel_probe_location_address_create(uint64_t address)
        ret->type = LTTNG_KERNEL_PROBE_LOCATION_TYPE_ADDRESS;
        ret->equal = lttng_kernel_probe_location_address_is_equal;
        ret->serialize = lttng_kernel_probe_location_address_serialize;
+       ret->hash = lttng_kernel_probe_location_address_hash;
 
 end:
        return ret;
@@ -145,6 +156,7 @@ lttng_kernel_probe_location_symbol_create(const char *symbol_name,
        ret->type = LTTNG_KERNEL_PROBE_LOCATION_TYPE_SYMBOL_OFFSET;
        ret->equal = lttng_kernel_probe_location_symbol_is_equal;
        ret->serialize = lttng_kernel_probe_location_symbol_serialize;
+       ret->hash = lttng_kernel_probe_location_symbol_hash;
        goto end;
 
 error:
@@ -489,6 +501,22 @@ end:
        return ret;
 }
 
+static
+unsigned long lttng_kernel_probe_location_address_hash(
+               const struct lttng_kernel_probe_location *location)
+{
+       unsigned long hash = hash_key_ulong(
+                       (void *) LTTNG_KERNEL_PROBE_LOCATION_TYPE_ADDRESS,
+                       lttng_ht_seed);
+       struct lttng_kernel_probe_location_address *address_location =
+                       container_of(location, typeof(*address_location),
+                               parent);
+
+       hash ^= hash_key_u64(&address_location->address, lttng_ht_seed);
+
+       return hash;
+}
+
 static
 bool lttng_kernel_probe_location_address_is_equal(
                const struct lttng_kernel_probe_location *_a,
@@ -512,6 +540,23 @@ end:
        return is_equal;
 }
 
+static
+unsigned long lttng_kernel_probe_location_symbol_hash(
+               const struct lttng_kernel_probe_location *location)
+{
+       unsigned long hash = hash_key_ulong(
+                       (void *) LTTNG_KERNEL_PROBE_LOCATION_TYPE_SYMBOL_OFFSET,
+                       lttng_ht_seed);
+       struct lttng_kernel_probe_location_symbol *symbol_location =
+                       container_of(location, typeof(*symbol_location),
+                               parent);
+
+       hash ^= hash_key_str(symbol_location->symbol_name, lttng_ht_seed);
+       hash ^= hash_key_u64(&symbol_location->offset, lttng_ht_seed);
+
+       return hash;
+}
+
 static
 bool lttng_kernel_probe_location_symbol_is_equal(
                const struct lttng_kernel_probe_location *_a,
@@ -672,3 +717,10 @@ struct lttng_kernel_probe_location *lttng_kernel_probe_location_copy(
 err:
        return new_location;
 }
+
+LTTNG_HIDDEN
+unsigned long lttng_kernel_probe_location_hash(
+       const struct lttng_kernel_probe_location *location)
+{
+       return location->hash(location);
+}