#define _LTTNG_TRACEPOINT_H
/*
- * Copyright (c) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
- * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
- *
- * Permission is hereby granted to use or copy this program
- * for any purpose, provided the above notices are retained on all copies.
- * Permission to modify the code and to distribute modified code is granted,
- * provided the above notices are retained, and a notice that the code was
- * modified is included with the above copyright notice.
+ * Copyright 2011-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
#include <lttng/tracepoint-types.h>
#include <lttng/tracepoint-rcu.h>
#include <urcu/compiler.h>
#include <dlfcn.h> /* for dlopen */
-#include <assert.h>
+#include <string.h> /* for memset */
+#include <lttng/ust-config.h> /* for sdt */
+#include <lttng/ust-compiler.h>
+
+#ifdef LTTNG_UST_HAVE_SDT_INTEGRATION
+#define SDT_USE_VARIADIC
+#include <sys/sdt.h>
+#else
+#define STAP_PROBEV(...)
+#endif
#ifdef __cplusplus
extern "C" {
#define tracepoint(provider, name, ...) \
do { \
+ STAP_PROBEV(provider, name, ## __VA_ARGS__); \
if (caa_unlikely(__tracepoint_##provider##___##name.state)) \
__tracepoint_cb_##provider##___##name(__VA_ARGS__); \
} while (0)
#define _TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend) \
__TP_COMBINE_TOKENS4(_tokena, _tokenb, _tokenc, _tokend)
-/* _TP_EXVAR* extract the var names. */
+/*
+ * _TP_EXVAR* extract the var names.
+ * _TP_EXVAR1 and _TP_EXDATA_VAR1 are needed for -std=c99.
+ */
#define _TP_EXVAR0()
+#define _TP_EXVAR1(a)
#define _TP_EXVAR2(a,b) b
#define _TP_EXVAR4(a,b,c,d) b,d
#define _TP_EXVAR6(a,b,c,d,e,f) b,d,f
#define _TP_EXVAR20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) b,d,f,h,j,l,n,p,r,t
#define _TP_EXDATA_VAR0() __tp_data
+#define _TP_EXDATA_VAR1(a) __tp_data
#define _TP_EXDATA_VAR2(a,b) __tp_data,b
#define _TP_EXDATA_VAR4(a,b,c,d) __tp_data,b,d
#define _TP_EXDATA_VAR6(a,b,c,d,e,f) __tp_data,b,d,f
#define _TP_EXDATA_VAR18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) __tp_data,b,d,f,h,j,l,n,p,r
#define _TP_EXDATA_VAR20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) __tp_data,b,d,f,h,j,l,n,p,r,t
-/* _TP_EXPROTO* extract tuples of type, var */
-#define _TP_EXPROTO0()
+/*
+ * _TP_EXPROTO* extract tuples of type, var.
+ * _TP_EXPROTO1 and _TP_EXDATA_PROTO1 are needed for -std=c99.
+ */
+#define _TP_EXPROTO0() void
+#define _TP_EXPROTO1(a) void
#define _TP_EXPROTO2(a,b) a b
#define _TP_EXPROTO4(a,b,c,d) a b,c d
#define _TP_EXPROTO6(a,b,c,d,e,f) a b,c d,e f
#define _TP_EXPROTO20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) a b,c d,e f,g h,i j,k l,m n,o p,q r,s t
#define _TP_EXDATA_PROTO0() void *__tp_data
+#define _TP_EXDATA_PROTO1(a) void *__tp_data
#define _TP_EXDATA_PROTO2(a,b) void *__tp_data,a b
#define _TP_EXDATA_PROTO4(a,b,c,d) void *__tp_data,a b,c d
#define _TP_EXDATA_PROTO6(a,b,c,d,e,f) void *__tp_data,a b,c d,e f
#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; \
\
- if (!TP_RCU_LINK_TEST()) \
+ if (caa_unlikely(!TP_RCU_LINK_TEST())) \
return; \
tp_rcu_read_lock_bp(); \
__tp_probe = tp_rcu_dereference_bp(__tracepoint_##_provider##___##_name.probes); \
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) \
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_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);
-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:
+ * shared across objects in a module/main executable.
+ */
+struct tracepoint_dlopen {
+ void *liblttngust_handle;
+
+ int (*tracepoint_register_lib)(struct tracepoint * const *tracepoints_start,
+ int tracepoints_count);
+ int (*tracepoint_unregister_lib)(struct tracepoint * const *tracepoints_start);
+#ifndef _LGPL_SOURCE
+ void (*rcu_read_lock_sym_bp)(void);
+ void (*rcu_read_unlock_sym_bp)(void);
+ void *(*rcu_dereference_sym_bp)(void *p);
+#endif
+};
+
+extern struct tracepoint_dlopen tracepoint_dlopen;
+
+#if defined(TRACEPOINT_DEFINE) || defined(TRACEPOINT_CREATE_PROBES)
+
+/*
+ * These weak symbols, the constructor, and destructor take care of
+ * registering only _one_ instance of the tracepoints per shared-ojbect
+ * (or for the whole main program).
+ */
+int __tracepoint_registered
+ __attribute__((weak, visibility("hidden")));
+int __tracepoint_ptrs_registered
+ __attribute__((weak, visibility("hidden")));
+struct tracepoint_dlopen tracepoint_dlopen
+ __attribute__((weak, visibility("hidden")));
+
+#ifndef _LGPL_SOURCE
+static inline void lttng_ust_notrace
+__tracepoint__init_urcu_sym(void);
+static inline void
+__tracepoint__init_urcu_sym(void)
+{
+ /*
+ * Symbols below are needed by tracepoint call sites and probe
+ * providers.
+ */
+ if (!tracepoint_dlopen.rcu_read_lock_sym_bp)
+ tracepoint_dlopen.rcu_read_lock_sym_bp =
+ URCU_FORCE_CAST(void (*)(void),
+ dlsym(tracepoint_dlopen.liblttngust_handle,
+ "tp_rcu_read_lock_bp"));
+ if (!tracepoint_dlopen.rcu_read_unlock_sym_bp)
+ tracepoint_dlopen.rcu_read_unlock_sym_bp =
+ URCU_FORCE_CAST(void (*)(void),
+ dlsym(tracepoint_dlopen.liblttngust_handle,
+ "tp_rcu_read_unlock_bp"));
+ if (!tracepoint_dlopen.rcu_dereference_sym_bp)
+ tracepoint_dlopen.rcu_dereference_sym_bp =
+ URCU_FORCE_CAST(void *(*)(void *p),
+ dlsym(tracepoint_dlopen.liblttngust_handle,
+ "tp_rcu_dereference_sym_bp"));
+}
+#else
+static inline void lttng_ust_notrace
+__tracepoint__init_urcu_sym(void);
+static inline void
+__tracepoint__init_urcu_sym(void)
+{
+}
+#endif
+
+static void lttng_ust_notrace __attribute__((constructor))
+__tracepoints__init(void);
+static void
+__tracepoints__init(void)
+{
+ if (__tracepoint_registered++)
+ return;
+
+ if (!tracepoint_dlopen.liblttngust_handle)
+ tracepoint_dlopen.liblttngust_handle =
+ dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL);
+ if (!tracepoint_dlopen.liblttngust_handle)
+ return;
+ __tracepoint__init_urcu_sym();
+}
+
+static void lttng_ust_notrace __attribute__((destructor))
+__tracepoints__destroy(void);
+static void
+__tracepoints__destroy(void)
+{
+ int ret;
+
+ if (--__tracepoint_registered)
+ return;
+ if (tracepoint_dlopen.liblttngust_handle && !__tracepoint_ptrs_registered) {
+ ret = dlclose(tracepoint_dlopen.liblttngust_handle);
+ if (ret) {
+ fprintf(stderr, "Error (%d) in dlclose\n", ret);
+ abort();
+ }
+ memset(&tracepoint_dlopen, 0, sizeof(tracepoint_dlopen));
+ }
+}
+
+#endif
#ifdef TRACEPOINT_DEFINE
+/*
+ * These weak symbols, the constructor, and destructor take care of
+ * registering only _one_ instance of the tracepoints per shared-ojbect
+ * (or for the whole main program).
+ */
+extern struct tracepoint * const __start___tracepoints_ptrs[]
+ __attribute__((weak, visibility("hidden")));
+extern struct tracepoint * const __stop___tracepoints_ptrs[]
+ __attribute__((weak, visibility("hidden")));
+
/*
* When TRACEPOINT_PROBE_DYNAMIC_LINKAGE is defined, we do not emit a
* unresolved symbol that requires the provider to be linked in. When
* object from the executable.
*/
#ifdef TRACEPOINT_PROBE_DYNAMIC_LINKAGE
-#define _TRACEPOINT_UNDEFINED_REF(provider)
+#define _TRACEPOINT_UNDEFINED_REF(provider) NULL
#else /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
-#define _TRACEPOINT_UNDEFINED_REF(provider) \
- &__tracepoint_provider_##provider,
+#define _TRACEPOINT_UNDEFINED_REF(provider) &__tracepoint_provider_##provider
#endif /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
/*
* in the __tracepoints_ptrs section.
* Therefore, this section is _not_ const (read-only).
*/
-#define _DEFINE_TRACEPOINT(provider, name) \
- extern int __tracepoint_provider_##provider; \
- static const char __tp_strtab_##provider##___##name[] \
+#define _TP_EXTRACT_STRING(...) #__VA_ARGS__
+
+#define _DEFINE_TRACEPOINT(_provider, _name, _args) \
+ extern int __tracepoint_provider_##_provider; \
+ static const char __tp_strtab_##_provider##___##_name[] \
__attribute__((section("__tracepoints_strings"))) = \
- #provider ":" #name; \
- struct tracepoint __tracepoint_##provider##___##name \
+ #_provider ":" #_name; \
+ struct tracepoint __tracepoint_##_provider##___##_name \
__attribute__((section("__tracepoints"))) = \
- { __tp_strtab_##provider##___##name, 0, NULL, _TRACEPOINT_UNDEFINED_REF(provider) }; \
- static struct tracepoint * __tracepoint_ptr_##provider##___##name \
+ { \
+ __tp_strtab_##_provider##___##_name, \
+ 0, \
+ NULL, \
+ _TRACEPOINT_UNDEFINED_REF(_provider), \
+ _TP_EXTRACT_STRING(_args), \
+ { }, \
+ }; \
+ static struct tracepoint * __tracepoint_ptr_##_provider##___##_name \
__attribute__((used, section("__tracepoints_ptrs"))) = \
- &__tracepoint_##provider##___##name;
-
-static int (*tracepoint_register_lib)(struct tracepoint * const *tracepoints_start,
- int tracepoints_count);
-static int (*tracepoint_unregister_lib)(struct tracepoint * const *tracepoints_start);
-static void *liblttngust_handle;
-
-/*
- * These weak symbols, the constructor, and destructor take care of
- * registering only _one_ instance of the tracepoints per shared-ojbect
- * (or for the whole main program).
- */
-extern struct tracepoint * const __start___tracepoints_ptrs[]
- __attribute__((weak, visibility("hidden")));
-extern struct tracepoint * const __stop___tracepoints_ptrs[]
- __attribute__((weak, visibility("hidden")));
-int __tracepoint_registered
- __attribute__((weak, visibility("hidden")));
+ &__tracepoint_##_provider##___##_name;
-static void __attribute__((constructor)) __tracepoints__init(void)
+static void lttng_ust_notrace __attribute__((constructor))
+__tracepoints__ptrs_init(void);
+static void
+__tracepoints__ptrs_init(void)
{
- if (__tracepoint_registered++)
+ if (__tracepoint_ptrs_registered++)
return;
-
- liblttngust_handle = dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL);
- if (!liblttngust_handle)
+ if (!tracepoint_dlopen.liblttngust_handle)
+ tracepoint_dlopen.liblttngust_handle =
+ dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL);
+ if (!tracepoint_dlopen.liblttngust_handle)
return;
- tracepoint_register_lib =
+ tracepoint_dlopen.tracepoint_register_lib =
URCU_FORCE_CAST(int (*)(struct tracepoint * const *, int),
- dlsym(liblttngust_handle,
+ dlsym(tracepoint_dlopen.liblttngust_handle,
"tracepoint_register_lib"));
- tracepoint_unregister_lib =
+ tracepoint_dlopen.tracepoint_unregister_lib =
URCU_FORCE_CAST(int (*)(struct tracepoint * const *),
- dlsym(liblttngust_handle,
+ dlsym(tracepoint_dlopen.liblttngust_handle,
"tracepoint_unregister_lib"));
-#ifndef _LGPL_SOURCE
- tp_rcu_read_lock_bp =
- URCU_FORCE_CAST(void (*)(void),
- dlsym(liblttngust_handle,
- "tp_rcu_read_lock_bp"));
- tp_rcu_read_unlock_bp =
- URCU_FORCE_CAST(void (*)(void),
- dlsym(liblttngust_handle,
- "tp_rcu_read_unlock_bp"));
- tp_rcu_dereference_sym_bp =
- URCU_FORCE_CAST(void *(*)(void *p),
- dlsym(liblttngust_handle,
- "tp_rcu_dereference_sym_bp"));
-#endif
- tracepoint_register_lib(__start___tracepoints_ptrs,
+ __tracepoint__init_urcu_sym();
+ if (tracepoint_dlopen.tracepoint_register_lib) {
+ tracepoint_dlopen.tracepoint_register_lib(__start___tracepoints_ptrs,
__stop___tracepoints_ptrs -
__start___tracepoints_ptrs);
+ }
}
-static void __attribute__((destructor)) __tracepoints__destroy(void)
+static void lttng_ust_notrace __attribute__((destructor))
+__tracepoints__ptrs_destroy(void);
+static void
+__tracepoints__ptrs_destroy(void)
{
int ret;
- if (--__tracepoint_registered)
+
+ if (--__tracepoint_ptrs_registered)
return;
- 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);
+ if (tracepoint_dlopen.tracepoint_unregister_lib)
+ tracepoint_dlopen.tracepoint_unregister_lib(__start___tracepoints_ptrs);
+ if (tracepoint_dlopen.liblttngust_handle && !__tracepoint_registered) {
+ ret = dlclose(tracepoint_dlopen.liblttngust_handle);
+ if (ret) {
+ fprintf(stderr, "Error (%d) in dlclose\n", ret);
+ abort();
+ }
+ memset(&tracepoint_dlopen, 0, sizeof(tracepoint_dlopen));
}
}
#else /* TRACEPOINT_DEFINE */
-#define _DEFINE_TRACEPOINT(provider, name)
+#define _DEFINE_TRACEPOINT(_provider, _name, _args)
#endif /* #else TRACEPOINT_DEFINE */
#define TRACEPOINT_EVENT(provider, name, args, fields) \
_DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \
- _DEFINE_TRACEPOINT(provider, name)
+ _DEFINE_TRACEPOINT(provider, name, _TP_PARAMS(args))
#define TRACEPOINT_EVENT_CLASS(provider, name, args, fields)
#define TRACEPOINT_EVENT_INSTANCE(provider, _template, name, args) \
_DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \
- _DEFINE_TRACEPOINT(provider, name)
+ _DEFINE_TRACEPOINT(provider, name, _TP_PARAMS(args))
#endif /* #ifndef TRACEPOINT_EVENT */
*
* Declare tracepoint loglevels for tracepoints. A TRACEPOINT_EVENT
* should be declared prior to the the TRACEPOINT_LOGLEVEL for a given
- * tracepoint name. The first field is the name of the tracepoint, the
- * second field is the loglevel name.
+ * tracepoint name. The first field is the provider name, the second
+ * field is the name of the tracepoint, the third field is the loglevel
+ * name.
*
* TRACEPOINT_LOGLEVEL(< [com_company_]project[_component] >, < event >,
* < loglevel_name >)
#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 */
projects / lttng-ust.git / blobdiff