#include <urcu-bp.h>
#include <tracepoint-types.h>
#include <urcu/compiler.h>
+#include <dlfcn.h> /* for dlopen */
#ifdef __cplusplus
extern "C" {
#endif
-#define tracepoint(provider, name, ...) \
- do { \
- if (caa_unlikely(__tracepoint_##provider##_##name.state)) \
- __tracepoint_##provider##_##name(__VA_ARGS__); \
+#define tracepoint(provider, name, ...) \
+ do { \
+ if (caa_unlikely(__tracepoint_##provider##___##name.state)) \
+ __tracepoint_cb_##provider##___##name(__VA_ARGS__); \
} while (0)
#define TP_ARGS(...) __VA_ARGS__
* fine too).
* Each tuple is also separated by a comma.
*/
-#define _TP_COMBINE_TOKENS1(_tokena, _tokenb) _tokena##_tokenb
-#define _TP_COMBINE_TOKENS(_tokena, _tokenb) _TP_COMBINE_TOKENS1(_tokena, _tokenb)
+#define __TP_COMBINE_TOKENS(_tokena, _tokenb) \
+ _tokena##_tokenb
+#define _TP_COMBINE_TOKENS(_tokena, _tokenb) \
+ __TP_COMBINE_TOKENS(_tokena, _tokenb)
+#define __TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \
+ _tokena##_tokenb##_tokenc
+#define _TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc) \
+ __TP_COMBINE_TOKENS3(_tokena, _tokenb, _tokenc)
+#define __TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
+ _tokena##_tokenb##_tokenc##_tokend
+#define _TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
+ __TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend)
-/* _TP_EXVAR* extract the vars names. */
+/* _TP_EXVAR* extract the var names. */
#define _TP_EXVAR0()
#define _TP_EXVAR2(a,b) b
#define _TP_EXVAR4(a,b,c,d) b,d
/* Preprocessor trick to count arguments. Inspired from sdt.h. */
#define _TP_NARGS(...) __TP_NARGS(__VA_ARGS__, 20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0)
#define __TP_NARGS(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20, N, ...) N
-#define _TP_PROTO_N(N, ...) _TP_PARAMS(TP_COMBINE_TOKENS(_TP_SPLIT, N)(__VA_ARGS__))
-#define _TP_VARS_N(N, ...) _TP_PARAMS(TP_COMBINE_TOKENS(_TP_EVEN, N)(__VA_ARGS__))
-#define _TP_DATA_PROTO_N(N, ...) _TP_PARAMS(TP_COMBINE_TOKENS(_TP_SPLIT_DATA, N)(__VA_ARGS__))
-#define _TP_DATA_VARS_N(N, ...) _TP_PARAMS(TP_COMBINE_TOKENS(_TP_EVEN_DATA, N)(__VA_ARGS__))
+#define _TP_PROTO_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXPROTO, N)(__VA_ARGS__))
+#define _TP_VAR_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXVAR, N)(__VA_ARGS__))
+#define _TP_DATA_PROTO_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXDATA_PROTO, N)(__VA_ARGS__))
+#define _TP_DATA_VAR_N(N, ...) _TP_PARAMS(_TP_COMBINE_TOKENS(_TP_EXDATA_VAR, N)(__VA_ARGS__))
#define _TP_ARGS_PROTO(...) _TP_PROTO_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
-#define _TP_ARGS_VARS(...) _TP_VARS_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
+#define _TP_ARGS_VAR(...) _TP_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
#define _TP_ARGS_DATA_PROTO(...) _TP_DATA_PROTO_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
-#define _TP_ARGS_DATA_VARS(...) _TP_DATA_VARS_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
+#define _TP_ARGS_DATA_VAR(...) _TP_DATA_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
#define _TP_PARAMS(...) __VA_ARGS__
#define _DECLARE_TRACEPOINT(provider, name, ...) \
-extern struct tracepoint __tracepoint_##provider##_##name; \
-static inline void __tracepoint_##provider##_##name(_TP_ARGS_DATA_PROTO(__VA_ARGS__)) \
+extern struct tracepoint __tracepoint_##provider##___##name; \
+static inline void __tracepoint_cb_##provider##___##name(_TP_ARGS_PROTO(__VA_ARGS__)) \
{ \
struct tracepoint_probe *__tp_probe; \
\
+ if (!rcu_read_lock_bp) \
+ return; \
rcu_read_lock_bp(); \
- p = rcu_dereference(__tracepoint_##provider##_##name.probes); \
- if (caa_unlikely(!p)) \
+ __tp_probe = rcu_dereference_bp(__tracepoint_##provider##___##name.probes); \
+ if (caa_unlikely(!__tp_probe)) \
goto end; \
do { \
- void *__tp_data = p->priv; \
+ void *__tp_cb = __tp_probe->func; \
+ void *__tp_data = __tp_probe->data; \
\
- (*p->callback)(_TP_ARGS_DATA_VARS(__VA_ARGS__)); \
- __tp_probe++; \
- } while (*__tp_probe); \
+ URCU_FORCE_CAST(void (*)(_TP_ARGS_DATA_PROTO(__VA_ARGS__)), __tp_cb) \
+ (_TP_ARGS_DATA_VAR(__VA_ARGS__)); \
+ } while ((++__tp_probe)->func); \
end: \
rcu_read_unlock_bp(); \
} \
-static inline void __tracepoint_register_##provider##_##name(char *name, \
- void *callback, void *priv) \
+static inline void __tracepoint_register_##provider##___##name(char *name, \
+ void *func, void *data) \
{ \
- __tracepoint_probe_register(name, callback, data); \
+ __tracepoint_probe_register(name, func, data); \
} \
-static inline void __tracepoint_unregister_##provider##_##name(char *name, \
- void *callback, void *priv) \
+static inline void __tracepoint_unregister_##provider##___##name(char *name, \
+ void *func, void *data) \
{ \
- __tracepoint_probe_unregister(name, callback, data); \
+ __tracepoint_probe_unregister(name, func, data); \
}
+extern int __tracepoint_probe_register(const char *name, void *func, void *data);
+extern int __tracepoint_probe_unregister(const char *name, void *func, void *data);
+
+#ifdef TRACEPOINT_DEFINE
+
/*
* Note: to allow PIC code, we need to allow the linker to update the pointers
* in the __tracepoints_ptrs section.
__attribute__((used, section("__tracepoints_ptrs"))) = \
&__tracepoint_##provider##___##name;
-extern int __tracepoint_probe_register(const char *name, void *callback, void *priv);
-extern int __tracepoint_probe_unregister(const char *name, void *callback, void *priv);
-extern int tracepoint_register_lib(struct tracepoint * const *tracepoints_start,
+static int (*tracepoint_register_lib)(struct tracepoint * const *tracepoints_start,
int tracepoints_count);
-extern int tracepoint_unregister_lib(struct tracepoint * const *tracepoints_start);
+static int (*tracepoint_unregister_lib)(struct tracepoint * const *tracepoints_start);
+static void *liblttngust_handle;
/*
* These weak symbols, the constructor, and destructor take care of
{
if (__tracepoint_registered++)
return;
+
+ liblttngust_handle = dlopen("liblttng-ust.so", RTLD_NOW | RTLD_GLOBAL);
+ if (!liblttngust_handle)
+ return;
+ tracepoint_register_lib =
+ URCU_FORCE_CAST(int (*)(struct tracepoint * const *, int),
+ dlsym(liblttngust_handle,
+ "tracepoint_register_lib"));
+ tracepoint_unregister_lib =
+ URCU_FORCE_CAST(int (*)(struct tracepoint * const *),
+ dlsym(liblttngust_handle,
+ "tracepoint_unregister_lib"));
tracepoint_register_lib(__start___tracepoints_ptrs,
__stop___tracepoints_ptrs -
__start___tracepoints_ptrs);
static void __attribute__((destructor)) __tracepoints__destroy(void)
{
+ int ret;
if (--__tracepoint_registered)
return;
- tracepoint_unregister_lib(__start___tracepoints_ptrs);
+ if (tracepoint_unregister_lib)
+ tracepoint_unregister_lib(__start___tracepoints_ptrs);
+ if (liblttngust_handle) {
+ tracepoint_unregister_lib = NULL;
+ tracepoint_register_lib = NULL;
+ ret = dlclose(liblttngust_handle);
+ assert(!ret);
+ }
}
+#else /* TRACEPOINT_DEFINE */
+
+#define _DEFINE_TRACEPOINT(provider, name)
+
+#endif /* #else TRACEPOINT_DEFINE */
+
#ifdef __cplusplus
}
#endif
* the provider:event identifier is limited to 127 characters.
*/
-
#define TRACEPOINT_EVENT(provider, name, args, fields) \
- _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args))
+ _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \
+ _DEFINE_TRACEPOINT(provider, name)
#define TRACEPOINT_EVENT_CLASS(provider, name, args, fields)
#define TRACEPOINT_EVENT_INSTANCE(provider, _template, name, args) \
- _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args))
+ _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \
+ _DEFINE_TRACEPOINT(provider, name)
#endif /* #ifndef TRACEPOINT_EVENT */
* Typical use of these loglevels:
*
* 1) Declare the mapping between loglevel names and an integer values
- * within TRACEPOINT_LOGLEVEL_ENUM, using TP_LOGLEVEL for each tuple.
- * Do _NOT_ add comma (,) nor semicolon (;) between the
- * TRACEPOINT_LOGLEVEL_ENUM entries. Do _NOT_ add comma (,) nor
- * semicolon (;) after the TRACEPOINT_LOGLEVEL_ENUM declaration. The
- * name should be a proper C99 identifier.
+ * within TRACEPOINT_LOGLEVEL_ENUM(), using tp_loglevel() for each
+ * tuple. Do _NOT_ add comma (,) nor semicolon (;) between the
+ * tp_loglevel entries contained within TRACEPOINT_LOGLEVEL_ENUM().
+ * Do _NOT_ add comma (,) nor semicolon (;) after the
+ * TRACEPOINT_LOGLEVEL_ENUM() declaration. The name should be a
+ * proper C99 identifier.
*
* TRACEPOINT_LOGLEVEL_ENUM(
- * TP_LOGLEVEL( < loglevel_name >, < value > )
- * TP_LOGLEVEL( < loglevel_name >, < value > )
+ * tp_loglevel( < loglevel_name >, < value > )
+ * tp_loglevel( < loglevel_name >, < value > )
* ...
* )
*
* e.g.:
*
* TRACEPOINT_LOGLEVEL_ENUM(
- * TP_LOGLEVEL(LOG_EMERG, 0)
- * TP_LOGLEVEL(LOG_ALERT, 1)
- * TP_LOGLEVEL(LOG_CRIT, 2)
- * TP_LOGLEVEL(LOG_ERR, 3)
- * TP_LOGLEVEL(LOG_WARNING, 4)
- * TP_LOGLEVEL(LOG_NOTICE, 5)
- * TP_LOGLEVEL(LOG_INFO, 6)
- * TP_LOGLEVEL(LOG_DEBUG, 7)
+ * tp_loglevel(LOG_EMERG, 0)
+ * tp_loglevel(LOG_ALERT, 1)
+ * tp_loglevel(LOG_CRIT, 2)
+ * tp_loglevel(LOG_ERR, 3)
+ * tp_loglevel(LOG_WARNING, 4)
+ * tp_loglevel(LOG_NOTICE, 5)
+ * tp_loglevel(LOG_INFO, 6)
+ * tp_loglevel(LOG_DEBUG, 7)
* )
*
* 2) Then, declare tracepoint loglevels for tracepoints. A
* provider.
*/
-#define TRACEPOINT_LOGLEVEL_ENUM()
-#define TRACEPOINT_LOGLEVEL(name, loglevel)
+#define TRACEPOINT_LOGLEVEL_ENUM(...)
+#define TRACEPOINT_LOGLEVEL(provider, name, loglevel)
#endif /* #ifndef TRACEPOINT_LOGLEVEL */
projects / lttng-ust.git / blobdiff