Lazy provider registration

[lttng-ust.git] / include / lttng / tracepoint.h

diff --git a/include/lttng/tracepoint.h b/include/lttng/tracepoint.h
index 3d54864fcf578ebc9fd50bfa69f2537334ef5dad..460ad205a481d196d1702f32c44392833cb0724a 100644 (file)
--- a/include/lttng/tracepoint.h
+++ b/include/lttng/tracepoint.h
@@ -13,6 +13,14 @@
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
  */
 
 #include <lttng/tracepoint-types.h>
@@ -22,6 +30,7 @@
 #include <string.h>    /* for memset */
 #include <assert.h>
 #include <lttng/ust-config.h>  /* for sdt */
+#include <lttng/ust-compiler.h>
 
 #ifdef LTTNG_UST_HAVE_SDT_INTEGRATION
 #define SDT_USE_VARIADIC
@@ -137,7 +146,10 @@ extern "C" {
 
 #define _DECLARE_TRACEPOINT(_provider, _name, ...)                                     \
 extern struct tracepoint __tracepoint_##_provider##___##_name;                         \
-static inline void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__))        \
+static inline lttng_ust_notrace                                                                \
+void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__));             \
+static inline                                                                          \
+void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__))              \
 {                                                                                      \
        struct tracepoint_probe *__tp_probe;                                            \
                                                                                        \
@@ -148,7 +160,7 @@ static inline void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_A
        if (caa_unlikely(!__tp_probe))                                                  \
                goto end;                                                               \
        do {                                                                            \
-               void *__tp_cb = __tp_probe->func;                                       \
+               void (*__tp_cb)(void) = __tp_probe->func;                                       \
                void *__tp_data = __tp_probe->data;                                     \
                                                                                        \
                URCU_FORCE_CAST(void (*)(_TP_ARGS_DATA_PROTO(__VA_ARGS__)), __tp_cb)    \
@@ -157,21 +169,30 @@ static inline void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_A
 end:                                                                                   \
        tp_rcu_read_unlock_bp();                                                        \
 }                                                                                      \
-static inline void __tracepoint_register_##_provider##___##_name(char *name,           \
-               void *func, void *data)                                                 \
+static inline lttng_ust_notrace                                                                \
+void __tracepoint_register_##_provider##___##_name(char *name,                         \
+               void (*func)(void), void *data);                                        \
+static inline                                                                          \
+void __tracepoint_register_##_provider##___##_name(char *name,                         \
+               void (*func)(void), void *data)                                         \
 {                                                                                      \
        __tracepoint_probe_register(name, func, data,                                   \
                __tracepoint_##_provider##___##_name.signature);                        \
 }                                                                                      \
-static inline void __tracepoint_unregister_##_provider##___##_name(char *name,         \
-               void *func, void *data)                                                 \
+static inline lttng_ust_notrace                                                                \
+void __tracepoint_unregister_##_provider##___##_name(char *name,                       \
+               void (*func)(void), void *data);                                        \
+static inline                                                                          \
+void __tracepoint_unregister_##_provider##___##_name(char *name,                       \
+               void (*func)(void), void *data)                                         \
 {                                                                                      \
        __tracepoint_probe_unregister(name, func, data);                                \
 }
 
-extern int __tracepoint_probe_register(const char *name, void *func, void *data,
-               const char *signature);
-extern int __tracepoint_probe_unregister(const char *name, void *func, void *data);
+extern int __tracepoint_probe_register(const char *name, void (*func)(void),
+               void *data, const char *signature);
+extern int __tracepoint_probe_unregister(const char *name, void (*func)(void),
+               void *data);
 
 /*
  * tracepoint dynamic linkage handling (callbacks). Hidden visibility:
@@ -248,7 +269,10 @@ int __tracepoint_registered
 struct tracepoint_dlopen tracepoint_dlopen
        __attribute__((weak, visibility("hidden")));
 
-static void __attribute__((constructor)) __tracepoints__init(void)
+static void lttng_ust_notrace __attribute__((constructor))
+__tracepoints__init(void);
+static void
+__tracepoints__init(void)
 {
        if (__tracepoint_registered++)
                return;
@@ -284,7 +308,10 @@ static void __attribute__((constructor)) __tracepoints__init(void)
                                __start___tracepoints_ptrs);
 }
 
-static void __attribute__((destructor)) __tracepoints__destroy(void)
+static void lttng_ust_notrace __attribute__((destructor))
+__tracepoints__destroy(void);
+static void
+__tracepoints__destroy(void)
 {
        int ret;
 
@@ -499,3 +526,9 @@ enum {
 #define TRACEPOINT_LOGLEVEL(provider, name, loglevel)
 
 #endif /* #ifndef TRACEPOINT_LOGLEVEL */
+
+#ifndef TRACEPOINT_MODEL_EMF_URI
+
+#define TRACEPOINT_MODEL_EMF_URI(provider, name, uri)
+
+#endif /* #ifndef TRACEPOINT_MODEL_EMF_URI */