-#ifndef _LTTNG_TRACEPOINT_H
-#define _LTTNG_TRACEPOINT_H
-
/*
- * Copyright (c) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * SPDX-License-Identifier: MIT
*
- * 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 (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
+#ifndef _LTTNG_TRACEPOINT_H
+#define _LTTNG_TRACEPOINT_H
+
+#include <stdio.h>
+#include <stdlib.h>
#include <lttng/tracepoint-types.h>
#include <lttng/tracepoint-rcu.h>
#include <urcu/compiler.h>
+#include <urcu/system.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
+/*
+ * Instead of using SDT_USE_VARIADIC from 'sys/sdt.h', use our own namespaced
+ * macros since the instrumented application might already have included
+ * 'sys/sdt.h' without variadic support.
+ */
+#include <sys/sdt.h>
+
+#define _LTTNG_SDT_NARG(...) \
+ __LTTNG_SDT_NARG(__VA_ARGS__, 12,11,10,9,8,7,6,5,4,3,2,1,0)
+
+#define __LTTNG_SDT_NARG(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12, N, ...) N
+
+#define _LTTNG_SDT_PROBE_N(provider, name, N, ...) \
+ _SDT_PROBE(provider, name, N, (__VA_ARGS__))
+
+#define LTTNG_STAP_PROBEV(provider, name, ...) \
+ _LTTNG_SDT_PROBE_N(provider, name, _LTTNG_SDT_NARG(0, ##__VA_ARGS__), ##__VA_ARGS__)
+
+#else
+#define LTTNG_STAP_PROBEV(...)
+#endif
#ifdef __cplusplus
extern "C" {
#endif
+#define tracepoint_enabled(provider, name) \
+ caa_unlikely(CMM_LOAD_SHARED(__tracepoint_##provider##___##name.state))
+
+#define do_tracepoint(provider, name, ...) \
+ __tracepoint_cb_##provider##___##name(__VA_ARGS__)
+
#define tracepoint(provider, name, ...) \
do { \
- if (caa_unlikely(__tracepoint_##provider##___##name.state)) \
- __tracepoint_cb_##provider##___##name(__VA_ARGS__); \
+ LTTNG_STAP_PROBEV(provider, name, ## __VA_ARGS__); \
+ if (tracepoint_enabled(provider, name)) \
+ do_tracepoint(provider, name, __VA_ARGS__); \
} while (0)
#define TP_ARGS(...) __VA_ARGS__
#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 _TP_ARGS_DATA_VAR(...) _TP_DATA_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
#define _TP_PARAMS(...) __VA_ARGS__
+/*
+ * The tracepoint cb is marked always inline so we can distinguish
+ * between caller's ip addresses within the probe using the return
+ * address.
+ */
#define _DECLARE_TRACEPOINT(_provider, _name, ...) \
-extern struct tracepoint __tracepoint_##_provider##___##_name; \
-static inline void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)) \
+extern struct lttng_ust_tracepoint __tracepoint_##_provider##___##_name; \
+static inline __attribute__((always_inline, unused)) lttng_ust_notrace \
+void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)); \
+static \
+void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)) \
{ \
- struct tracepoint_probe *__tp_probe; \
+ struct lttng_ust_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); \
+ tp_rcu_read_lock(); \
+ __tp_probe = tp_rcu_dereference(__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) \
(_TP_ARGS_DATA_VAR(__VA_ARGS__)); \
} while ((++__tp_probe)->func); \
end: \
- tp_rcu_read_unlock_bp(); \
+ tp_rcu_read_unlock(); \
} \
-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 lttng_ust_tracepoint_dlopen {
+ void *liblttngust_handle;
+
+ int (*tracepoint_register_lib)(struct lttng_ust_tracepoint * const *tracepoints_start,
+ int tracepoints_count);
+ int (*tracepoint_unregister_lib)(struct lttng_ust_tracepoint * const *tracepoints_start);
+ void (*rcu_read_lock_sym)(void);
+ void (*rcu_read_unlock_sym)(void);
+ void *(*rcu_dereference_sym)(void *p);
+};
+
+extern struct lttng_ust_tracepoint_dlopen tracepoint_dlopen;
+extern struct lttng_ust_tracepoint_dlopen *tracepoint_dlopen_ptr;
+
+/*
+ * 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 lttng_ust_tracepoint_dlopen tracepoint_dlopen
+ __attribute__((weak, visibility("hidden")));
+/*
+ * Deal with gcc O1 optimisation issues with weak hidden symbols. gcc
+ * 4.8 and prior does not have the same behavior for symbol scoping on
+ * 32-bit powerpc depending on the object size: symbols for objects of 8
+ * bytes or less have the same address throughout a module, whereas they
+ * have different addresses between compile units for objects larger
+ * than 8 bytes. Add this pointer indirection to ensure that the symbol
+ * scoping match that of the other weak hidden symbols found in this
+ * header.
+ */
+struct lttng_ust_tracepoint_dlopen *tracepoint_dlopen_ptr
+ __attribute__((weak, visibility("hidden")));
+
+/*
+ * Tracepoint dynamic linkage handling (callbacks). Hidden visibility: shared
+ * across objects in a module/main executable. The callbacks are used to
+ * control and check if the destructors should be executed.
+ */
+struct lttng_ust_tracepoint_destructors_syms {
+ void (*tracepoint_disable_destructors)(void);
+ int (*tracepoint_get_destructors_state)(void);
+};
+
+extern struct lttng_ust_tracepoint_destructors_syms tracepoint_destructors_syms;
+extern struct lttng_ust_tracepoint_destructors_syms *tracepoint_destructors_syms_ptr;
+
+struct lttng_ust_tracepoint_destructors_syms tracepoint_destructors_syms
+ __attribute__((weak, visibility("hidden")));
+struct lttng_ust_tracepoint_destructors_syms *tracepoint_destructors_syms_ptr
+ __attribute__((weak, visibility("hidden")));
+
+static inline void tracepoint_disable_destructors(void)
+{
+ if (!tracepoint_dlopen_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (!tracepoint_destructors_syms_ptr)
+ tracepoint_destructors_syms_ptr = &tracepoint_destructors_syms;
+ if (tracepoint_dlopen_ptr->liblttngust_handle
+ && tracepoint_destructors_syms_ptr->tracepoint_disable_destructors)
+ tracepoint_destructors_syms_ptr->tracepoint_disable_destructors();
+}
+
+#ifndef _LGPL_SOURCE
+static inline void lttng_ust_notrace
+__tracepoint__init_urcu_sym(void);
+static inline void
+__tracepoint__init_urcu_sym(void)
+{
+ if (!tracepoint_dlopen_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ /*
+ * Symbols below are needed by tracepoint call sites and probe
+ * providers.
+ */
+ if (!tracepoint_dlopen_ptr->rcu_read_lock_sym)
+ tracepoint_dlopen_ptr->rcu_read_lock_sym =
+ URCU_FORCE_CAST(void (*)(void),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_rcu_read_lock"));
+ if (!tracepoint_dlopen_ptr->rcu_read_unlock_sym)
+ tracepoint_dlopen_ptr->rcu_read_unlock_sym =
+ URCU_FORCE_CAST(void (*)(void),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_rcu_read_unlock"));
+ if (!tracepoint_dlopen_ptr->rcu_dereference_sym)
+ tracepoint_dlopen_ptr->rcu_dereference_sym =
+ URCU_FORCE_CAST(void *(*)(void *p),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_rcu_dereference_sym"));
+}
+#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++) {
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
+ return;
+ __tracepoint__init_urcu_sym();
+ return;
+ }
+
+ if (!tracepoint_dlopen_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
+ tracepoint_dlopen_ptr->liblttngust_handle =
+ dlopen("liblttng-ust-tracepoint.so.1", RTLD_NOW | RTLD_GLOBAL);
+ if (!tracepoint_dlopen_ptr->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_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (!tracepoint_destructors_syms_ptr)
+ tracepoint_destructors_syms_ptr = &tracepoint_destructors_syms;
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
+ return;
+ if (__tracepoint_ptrs_registered)
+ return;
+ /*
+ * Lookup if destructors must be executed using the new method.
+ */
+ if (tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state
+ && !tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state()) {
+ /*
+ * The tracepoint_get_destructors_state symbol was found with
+ * dlsym but its returned value is 0 meaning that destructors
+ * must not be executed.
+ */
+ return;
+ }
+ ret = dlclose(tracepoint_dlopen_ptr->liblttngust_handle);
+ if (ret) {
+ fprintf(stderr, "Error (%d) in dlclose\n", ret);
+ abort();
+ }
+ memset(tracepoint_dlopen_ptr, 0, sizeof(*tracepoint_dlopen_ptr));
+}
#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 lttng_ust_tracepoint * const __start___tracepoints_ptrs[]
+ __attribute__((weak, visibility("hidden")));
+extern struct lttng_ust_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 lttng_ust_tracepoint __tracepoint_##_provider##___##_name \
__attribute__((section("__tracepoints"))) = \
- { __tp_strtab_##provider##___##name, 0, NULL, _TRACEPOINT_UNDEFINED_REF(provider) }; \
- 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")));
-
-static void __attribute__((constructor)) __tracepoints__init(void)
+ { \
+ __tp_strtab_##_provider##___##_name, \
+ 0, \
+ NULL, \
+ _TRACEPOINT_UNDEFINED_REF(_provider), \
+ _TP_EXTRACT_STRING(_args), \
+ { }, \
+ }; \
+ static struct lttng_ust_tracepoint * \
+ __tracepoint_ptr_##_provider##___##_name \
+ __attribute__((section("__tracepoints_ptrs"), used)) \
+ __lttng_ust_variable_attribute_no_sanitize_address = \
+ &__tracepoint_##_provider##___##_name;
+
+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_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
+ tracepoint_dlopen_ptr->liblttngust_handle =
+ dlopen("liblttng-ust-tracepoint.so.1", RTLD_NOW | RTLD_GLOBAL);
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
return;
- tracepoint_register_lib =
- URCU_FORCE_CAST(int (*)(struct tracepoint * const *, int),
- dlsym(liblttngust_handle,
+ if (!tracepoint_destructors_syms_ptr)
+ tracepoint_destructors_syms_ptr = &tracepoint_destructors_syms;
+ tracepoint_dlopen_ptr->tracepoint_register_lib =
+ URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *, int),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
"tracepoint_register_lib"));
- tracepoint_unregister_lib =
- URCU_FORCE_CAST(int (*)(struct tracepoint * const *),
- dlsym(liblttngust_handle,
+ tracepoint_dlopen_ptr->tracepoint_unregister_lib =
+ URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
"tracepoint_unregister_lib"));
-#ifndef _LGPL_SOURCE
- tp_rcu_read_lock_bp =
+ tracepoint_destructors_syms_ptr->tracepoint_disable_destructors =
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,
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_disable_destructors"));
+ tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state =
+ URCU_FORCE_CAST(int (*)(void),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_get_destructors_state"));
+ __tracepoint__init_urcu_sym();
+ if (tracepoint_dlopen_ptr->tracepoint_register_lib) {
+ tracepoint_dlopen_ptr->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_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (!tracepoint_destructors_syms_ptr)
+ tracepoint_destructors_syms_ptr = &tracepoint_destructors_syms;
+ if (tracepoint_dlopen_ptr->tracepoint_unregister_lib)
+ tracepoint_dlopen_ptr->tracepoint_unregister_lib(__start___tracepoints_ptrs);
+ if (tracepoint_dlopen_ptr->liblttngust_handle
+ && tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state
+ && tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state()
+ && !__tracepoint_ptrs_registered) {
+ ret = dlclose(tracepoint_dlopen_ptr->liblttngust_handle);
+ if (ret) {
+ fprintf(stderr, "Error (%d) in dlclose\n", ret);
+ abort();
+ }
+ memset(tracepoint_dlopen_ptr, 0, sizeof(*tracepoint_dlopen_ptr));
}
}
#else /* TRACEPOINT_DEFINE */
-#define _DEFINE_TRACEPOINT(provider, name)
+#define _DEFINE_TRACEPOINT(_provider, _name, _args)
#endif /* #else TRACEPOINT_DEFINE */
/* The following declarations must be outside re-inclusion protection. */
+#ifndef TRACEPOINT_ENUM
+
+/*
+ * Tracepoint Enumerations
+ *
+ * The enumeration is a mapping between an integer, or range of integers, and
+ * a string. It can be used to have a more compact trace in cases where the
+ * possible values for a field are limited:
+ *
+ * An example:
+ *
+ * TRACEPOINT_ENUM(someproject_component, enumname,
+ * TP_ENUM_VALUES(
+ * ctf_enum_value("even", 0)
+ * ctf_enum_value("uneven", 1)
+ * ctf_enum_range("twoto4", 2, 4)
+ * ctf_enum_value("five", 5)
+ * )
+ * )
+ *
+ * Where "someproject_component" is the name of the component this enumeration
+ * belongs to and "enumname" identifies this enumeration. Inside the
+ * TP_ENUM_VALUES macro is the actual mapping. Each string value can map
+ * to either a single value with ctf_enum_value or a range of values
+ * with ctf_enum_range.
+ *
+ * Enumeration ranges may overlap, but the behavior is implementation-defined,
+ * each trace reader will handle overlapping as it wishes.
+ *
+ * That enumeration can then be used in a field inside the TP_FIELD macro using
+ * the following line:
+ *
+ * ctf_enum(someproject_component, enumname, enumtype, enumfield, enumval)
+ *
+ * Where "someproject_component" and "enumname" match those in the
+ * TRACEPOINT_ENUM, "enumtype" is a signed or unsigned integer type
+ * backing the enumeration, "enumfield" is the name of the field and
+ * "enumval" is the value.
+ */
+
+#define TRACEPOINT_ENUM(provider, name, values)
+
+#endif /* #ifndef TRACEPOINT_ENUM */
+
#ifndef TRACEPOINT_EVENT
/*
* How to use the TRACEPOINT_EVENT macro:
*
* An example:
- *
+ *
* TRACEPOINT_EVENT(someproject_component, event_name,
*
* * TP_ARGS takes from 0 to 10 "type, field_name" pairs *
* * TP_FIELDS describes the event payload layout in the trace *
*
* TP_FIELDS(
- * * Integer, printed in base 10 *
+ * * Integer, printed in base 10 *
* ctf_integer(int, field_a, arg0)
*
- * * Integer, printed with 0x base 16 *
+ * * Integer, printed with 0x base 16 *
* ctf_integer_hex(unsigned long, field_d, arg1)
*
- * * Array Sequence, printed as UTF8-encoded array of bytes *
+ * * Enumeration *
+ * ctf_enum(someproject_component, enum_name, int, field_e, arg0)
+ *
+ * * Array Sequence, printed as UTF8-encoded array of bytes *
* ctf_array_text(char, field_b, string, FIXED_LEN)
* ctf_sequence_text(char, field_c, string, size_t, strlen)
*
- * * String, printed as UTF8-encoded string *
+ * * String, printed as UTF8-encoded string *
* ctf_string(field_e, string)
*
- * * Array sequence of signed integer values *
+ * * Array sequence of signed integer values *
* ctf_array(long, field_f, arg4, FIXED_LEN4)
* ctf_sequence(long, field_g, arg4, size_t, arg4_len)
* )
#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 */
* debug information with line-level scope (TRACEPOINT_EVENT default)
*
* TRACE_DEBUG 14
- * debug-level message (trace_printf default)
+ * debug-level message
*
* 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