-#ifndef _UST_TRACEPOINT_H
-#define _UST_TRACEPOINT_H
+#ifndef _LTTNG_TRACEPOINT_H
+#define _LTTNG_TRACEPOINT_H
/*
- * Copyright (C) 2008-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (C) 2009 Pierre-Marc Fournier
- * Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Heavily inspired from the Linux Kernel Markers.
- *
- * Ported to userspace by Pierre-Marc Fournier.
+ * 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 <urcu-bp.h>
-#include <urcu/list.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 <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>
+#define LTTNG_STAP_PROBEV STAP_PROBEV
+#else
+#define LTTNG_STAP_PROBEV(...)
+#endif
#ifdef __cplusplus
extern "C" {
#endif
-struct tracepoint_probe {
- void *func;
- void *data;
-};
+#define tracepoint_enabled(provider, name) \
+ caa_unlikely(CMM_LOAD_SHARED(__tracepoint_##provider##___##name.state))
-struct tracepoint {
- const char *name; /* Tracepoint name */
- char state; /* State. */
- struct tracepoint_probe *probes;
-};
+#define do_tracepoint(provider, name, ...) \
+ __tracepoint_cb_##provider##___##name(__VA_ARGS__)
+
+#define tracepoint(provider, name, ...) \
+ do { \
+ 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__
/*
- * Tracepoints should be added to the instrumented code using the
- * "tracepoint()" macro.
+ * TP_ARGS takes tuples of type, argument separated by a comma.
+ * It can take up to 10 tuples (which means that less than 10 tuples is
+ * fine too).
+ * Each tuple is also separated by a comma.
*/
-#define tracepoint(name, args...) __trace_##name(args)
+#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)
/*
- * it_func[0] is never NULL because there is at least one element in the array
- * when the array itself is non NULL.
+ * _TP_EXVAR* extract the var names.
+ * _TP_EXVAR1 and _TP_EXDATA_VAR1 are needed for -std=c99.
*/
-#define __DO_TRACE(tp, proto, args) \
- do { \
- struct tracepoint_probe *__tp_it_probe_ptr; \
- void *__tp_it_func; \
- void *__tp_cb_data; \
- \
- rcu_read_lock(); \
- __tp_it_probe_ptr = rcu_dereference((tp)->probes); \
- if (__tp_it_probe_ptr) { \
- do { \
- __tp_it_func = __tp_it_probe_ptr->func; \
- __tp_cb_data = __tp_it_probe_ptr->data; \
- URCU_FORCE_CAST(void(*)(proto), __tp_it_func)(args); \
- } while ((++__tp_it_probe_ptr)->func); \
- } \
- rcu_read_unlock(); \
- } while (0)
-
-#define TP_PARAMS(args...) args
-#define TP_PROTO(args...) args
-#define TP_ARGS(args...) args
-
-#define __CHECK_TRACE(name, proto, args) \
- do { \
- if (caa_unlikely(__tracepoint_##name.state)) \
- __DO_TRACE(&__tracepoint_##name, \
- TP_PROTO(proto), TP_ARGS(args)); \
- } while (0)
+#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_EXVAR8(a,b,c,d,e,f,g,h) b,d,f,h
+#define _TP_EXVAR10(a,b,c,d,e,f,g,h,i,j) b,d,f,h,j
+#define _TP_EXVAR12(a,b,c,d,e,f,g,h,i,j,k,l) b,d,f,h,j,l
+#define _TP_EXVAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) b,d,f,h,j,l,n
+#define _TP_EXVAR16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) b,d,f,h,j,l,n,p
+#define _TP_EXVAR18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) b,d,f,h,j,l,n,p,r
+#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_VAR8(a,b,c,d,e,f,g,h) __tp_data,b,d,f,h
+#define _TP_EXDATA_VAR10(a,b,c,d,e,f,g,h,i,j) __tp_data,b,d,f,h,j
+#define _TP_EXDATA_VAR12(a,b,c,d,e,f,g,h,i,j,k,l) __tp_data,b,d,f,h,j,l
+#define _TP_EXDATA_VAR14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) __tp_data,b,d,f,h,j,l,n
+#define _TP_EXDATA_VAR16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) __tp_data,b,d,f,h,j,l,n,p
+#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
/*
- * Make sure the alignment of the structure in the __tracepoints section will
- * not add unwanted padding between the beginning of the section and the
- * structure. Force alignment to the same alignment as the section start.
+ * _TP_EXPROTO* extract tuples of type, var.
+ * _TP_EXPROTO1 and _TP_EXDATA_PROTO1 are needed for -std=c99.
*/
-#define __DECLARE_TRACEPOINT(name, proto, args, data_proto, data_args) \
- extern struct tracepoint __tracepoint_##name; \
- static inline void __trace_##name(proto) \
- { \
- __CHECK_TRACE(name, TP_PROTO(data_proto), \
- TP_ARGS(data_args)); \
- } \
- static inline int \
- __register_trace_##name(void (*probe)(data_proto), void *data) \
- { \
- return __tracepoint_probe_register(#name, (void *)probe,\
- data); \
- } \
- static inline int \
- __unregister_trace_##name(void (*probe)(data_proto), void *data)\
- { \
- return __tracepoint_probe_unregister(#name, (void *)probe, \
- data); \
- }
+#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_EXPROTO8(a,b,c,d,e,f,g,h) a b,c d,e f,g h
+#define _TP_EXPROTO10(a,b,c,d,e,f,g,h,i,j) a b,c d,e f,g h,i j
+#define _TP_EXPROTO12(a,b,c,d,e,f,g,h,i,j,k,l) a b,c d,e f,g h,i j,k l
+#define _TP_EXPROTO14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) a b,c d,e f,g h,i j,k l,m n
+#define _TP_EXPROTO16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) a b,c d,e f,g h,i j,k l,m n,o p
+#define _TP_EXPROTO18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) a b,c d,e f,g h,i j,k l,m n,o p,q r
+#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_EXDATA_PROTO8(a,b,c,d,e,f,g,h) void *__tp_data,a b,c d,e f,g h
+#define _TP_EXDATA_PROTO10(a,b,c,d,e,f,g,h,i,j) void *__tp_data,a b,c d,e f,g h,i j
+#define _TP_EXDATA_PROTO12(a,b,c,d,e,f,g,h,i,j,k,l) void *__tp_data,a b,c d,e f,g h,i j,k l
+#define _TP_EXDATA_PROTO14(a,b,c,d,e,f,g,h,i,j,k,l,m,n) void *__tp_data,a b,c d,e f,g h,i j,k l,m n
+#define _TP_EXDATA_PROTO16(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p
+#define _TP_EXDATA_PROTO18(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p,q r
+#define _TP_EXDATA_PROTO20(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t) void *__tp_data,a b,c d,e f,g h,i j,k l,m n,o p,q r,s t
+
+/* 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_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_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_VAR(...) _TP_DATA_VAR_N(_TP_NARGS(0, ##__VA_ARGS__), ##__VA_ARGS__)
+#define _TP_PARAMS(...) __VA_ARGS__
/*
- * The need for the _DECLARE_TRACEPOINT_NOARGS() is to handle the prototype
- * (void). "void" is a special value in a function prototype and can
- * not be combined with other arguments. Since the DECLARE_TRACEPOINT()
- * macro adds a data element at the beginning of the prototype,
- * we need a way to differentiate "(void *data, proto)" from
- * "(void *data, void)". The second prototype is invalid.
- *
- * DECLARE_TRACEPOINT_NOARGS() passes "void" as the tracepoint prototype
- * and "void *__tp_cb_data" as the callback prototype.
- *
- * DECLARE_TRACEPOINT() passes "proto" as the tracepoint protoype and
- * "void *__tp_cb_data, proto" as the callback prototype.
+ * 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_NOARGS(name) \
- __DECLARE_TRACEPOINT(name, void, , void *__tp_cb_data, __tp_cb_data)
+#define _DECLARE_TRACEPOINT(_provider, _name, ...) \
+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 lttng_ust_tracepoint_probe *__tp_probe; \
+ \
+ 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)(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(); \
+} \
+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 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); \
+}
-#define _DECLARE_TRACEPOINT(name, proto, args) \
- __DECLARE_TRACEPOINT(name, TP_PARAMS(proto), TP_PARAMS(args), \
- TP_PARAMS(void *__tp_cb_data, proto), \
- TP_PARAMS(__tp_cb_data, args))
+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);
/*
- * __tracepoints_ptrs section is not const (read-only) to let the linker update
- * the pointer, allowing PIC code.
+ * tracepoint dynamic linkage handling (callbacks). Hidden visibility:
+ * shared across objects in a module/main executable.
*/
-#define _DEFINE_TRACEPOINT(name) \
- static const char __tpstrtab_##name[] \
- __attribute__((section("__tracepoints_strings"))) = #name; \
- struct tracepoint __tracepoint_##name \
- __attribute__((section("__tracepoints"))) = \
- { __tpstrtab_##name, 0, NULL }; \
- static struct tracepoint * __tracepoint_ptr_##name \
- __attribute__((used, section("__tracepoints_ptrs"))) = \
- &__tracepoint_##name;
-
-
-#define __register_tracepoint(name, probe, data) \
- __register_trace_##name(probe, data)
-#define __unregister_tracepoint(name, probe, data) \
- __unregister_trace_##name(probe, data)
+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_bp)(void);
+ void (*rcu_read_unlock_sym_bp)(void);
+ void *(*rcu_dereference_sym_bp)(void *p);
+};
+
+extern struct lttng_ust_tracepoint_dlopen tracepoint_dlopen;
+extern struct lttng_ust_tracepoint_dlopen *tracepoint_dlopen_ptr;
+
+/* Disable tracepoint destructors. */
+int __tracepoints__disable_destructors __attribute__((weak));
/*
- * Connect a probe to a tracepoint.
- * Internal API.
+ * Programs that have threads that survive after they exit, and
+ * therefore call library destructors, should disable the tracepoint
+ * destructors by calling tracepoint_disable_destructors(). This will
+ * leak the tracepoint instrumentation library shared object, leaving
+ * its teardown to the operating system process teardown.
*/
-extern
-int __tracepoint_probe_register(const char *name, void *probe, void *data);
+static inline void tracepoint_disable_destructors(void)
+{
+ __tracepoints__disable_destructors = 1;
+}
/*
- * Disconnect a probe from a tracepoint.
- * Internal API.
+ * 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.
*/
-extern
-int __tracepoint_probe_unregister(const char *name, void *probe, void *data);
+struct lttng_ust_tracepoint_dlopen *tracepoint_dlopen_ptr
+ __attribute__((weak, visibility("hidden")));
-extern
-int tracepoint_register_lib(struct tracepoint * const *tracepoints_start,
- int tracepoints_count);
-extern
-int tracepoint_unregister_lib(struct tracepoint * const *tracepoints_start);
+#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_bp)
+ tracepoint_dlopen_ptr->rcu_read_lock_sym_bp =
+ URCU_FORCE_CAST(void (*)(void),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_rcu_read_lock_bp"));
+ if (!tracepoint_dlopen_ptr->rcu_read_unlock_sym_bp)
+ tracepoint_dlopen_ptr->rcu_read_unlock_sym_bp =
+ URCU_FORCE_CAST(void (*)(void),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tp_rcu_read_unlock_bp"));
+ if (!tracepoint_dlopen_ptr->rcu_dereference_sym_bp)
+ tracepoint_dlopen_ptr->rcu_dereference_sym_bp =
+ URCU_FORCE_CAST(void *(*)(void *p),
+ dlsym(tracepoint_dlopen_ptr->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++) {
+ 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.0", 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 (!__tracepoints__disable_destructors
+ && tracepoint_dlopen_ptr->liblttngust_handle
+ && !__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));
+ }
+}
+
+#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[]
+extern struct lttng_ust_tracepoint * const __start___tracepoints_ptrs[]
__attribute__((weak, visibility("hidden")));
-extern struct tracepoint * const __stop___tracepoints_ptrs[]
- __attribute__((weak, visibility("hidden")));
-int __tracepoint_registered
+extern struct lttng_ust_tracepoint * const __stop___tracepoints_ptrs[]
__attribute__((weak, visibility("hidden")));
-static void __attribute__((constructor)) __tracepoints__init(void)
+/*
+ * When TRACEPOINT_PROBE_DYNAMIC_LINKAGE is defined, we do not emit a
+ * unresolved symbol that requires the provider to be linked in. When
+ * TRACEPOINT_PROBE_DYNAMIC_LINKAGE is not defined, we emit an
+ * unresolved symbol that depends on having the provider linked in,
+ * otherwise the linker complains. This deals with use of static
+ * libraries, ensuring that the linker does not remove the provider
+ * object from the executable.
+ */
+#ifdef TRACEPOINT_PROBE_DYNAMIC_LINKAGE
+#define _TRACEPOINT_UNDEFINED_REF(provider) NULL
+#else /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
+#define _TRACEPOINT_UNDEFINED_REF(provider) &__tracepoint_provider_##provider
+#endif /* TRACEPOINT_PROBE_DYNAMIC_LINKAGE */
+
+/*
+ * Note: to allow PIC code, we need to allow the linker to update the pointers
+ * in the __tracepoints_ptrs section.
+ * Therefore, this section is _not_ const (read-only).
+ */
+#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 lttng_ust_tracepoint __tracepoint_##_provider##___##_name \
+ __attribute__((section("__tracepoints"))) = \
+ { \
+ __tp_strtab_##_provider##___##_name, \
+ 0, \
+ NULL, \
+ _TRACEPOINT_UNDEFINED_REF(_provider), \
+ _TP_EXTRACT_STRING(_args), \
+ { }, \
+ }; \
+ static struct lttng_ust_tracepoint * \
+ __tracepoint_ptr_##_provider##___##_name \
+ __attribute__((used, section("__tracepoints_ptrs"))) = \
+ &__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;
+ 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.0", RTLD_NOW | RTLD_GLOBAL);
+ if (!tracepoint_dlopen_ptr->liblttngust_handle)
return;
- tracepoint_register_lib(__start___tracepoints_ptrs,
+ 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_dlopen_ptr->tracepoint_unregister_lib =
+ URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *),
+ dlsym(tracepoint_dlopen_ptr->liblttngust_handle,
+ "tracepoint_unregister_lib"));
+ __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)
{
- if (--__tracepoint_registered)
+ int ret;
+
+ if (--__tracepoint_ptrs_registered)
return;
- tracepoint_unregister_lib(__start___tracepoints_ptrs);
+ if (!tracepoint_dlopen_ptr)
+ tracepoint_dlopen_ptr = &tracepoint_dlopen;
+ if (tracepoint_dlopen_ptr->tracepoint_unregister_lib)
+ tracepoint_dlopen_ptr->tracepoint_unregister_lib(__start___tracepoints_ptrs);
+ if (!__tracepoints__disable_destructors
+ && tracepoint_dlopen_ptr->liblttngust_handle
+ && !__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, _args)
+
+#endif /* #else TRACEPOINT_DEFINE */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LTTNG_TRACEPOINT_H */
+
+/* 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
+
/*
- * Usage of the TRACEPOINT_EVENT macro:
+ * How to use the TRACEPOINT_EVENT macro:
*
- * In short, an example:
+ * An example:
+ *
+ * TRACEPOINT_EVENT(someproject_component, event_name,
*
- * TRACEPOINT_EVENT(< [com_company_]project_[component_]event >,
- * TP_PROTO(int arg0, void *arg1, char *string, size_t strlen,
- * long *arg4, size_t arg4_len),
- * TP_ARGS(arg0, arg1, string, strlen, arg4, arg4_len),
- * TP_FIELDS(
+ * * TP_ARGS takes from 0 to 10 "type, field_name" pairs *
+ *
+ * TP_ARGS(int, arg0, void *, arg1, char *, string, size_t, strlen,
+ * long *, arg4, size_t, arg4_len),
*
+ * * TP_FIELDS describes the event payload layout in the trace *
+ *
+ * TP_FIELDS(
* * Integer, printed in base 10 *
* ctf_integer(int, field_a, arg0)
*
* * Integer, printed with 0x base 16 *
* ctf_integer_hex(unsigned long, field_d, arg1)
*
+ * * 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)
* )
* )
*
- * In more detail:
- *
- * We define a tracepoint, its arguments, and its 'fast binary record'
- * layout.
+ * More detailed explanation:
*
- * Firstly, name your tracepoint via TRACEPOINT_EVENT(name,
+ * The name of the tracepoint is expressed as a tuple with the provider
+ * and name arguments.
*
- * The name should be a proper C99 identifier.
- * The "name" MUST follow these rules to ensure no namespace clash
- * occurs:
+ * The provider and name should be a proper C99 identifier.
+ * The "provider" and "name" MUST follow these rules to ensure no
+ * namespace clash occurs:
*
* For projects (applications and libraries) for which an entity
* specific to the project controls the source code and thus its
* tracepoints (typically with a scope larger than a single company):
*
* either:
- * project_component_event
+ * project_component, event
* or:
- * project_event
+ * project, event
*
* Where "project" is the name of the project,
* "component" is the name of the project component (which may
* "com_" prefix should be used:
*
* either:
- * com_company_project_component_event
+ * com_company_project_component, event
* or:
- * com_company_project_event
+ * com_company_project, event
*
* Where "company" is the name of the company,
* "project" is the name of the project,
* (optional),
* "event" is the name of the tracepoint event.
*
- *
- * As an example, let's consider a user-space application "someproject"
- * that would have an internal thread scheduler:
- *
- * TRACEPOINT_EVENT(someproject_sched_switch,
- *
- * *
- * * A function has a regular function arguments
- * * prototype, declare it via TP_PROTO():
- * *
- *
- * TP_PROTO(struct rq *rq, struct task_struct *prev,
- * struct task_struct *next),
- *
- * *
- * * Define the call signature of the 'function'.
- * * (Design sidenote: we use this instead of a
- * * TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
- * *
- *
- * TP_ARGS(rq, prev, next),
- *
- * *
- * * Fast binary tracing: define the trace record via
- * * TP_FIELDS(). You can think about it like a
- * * regular C structure local variable definition.
- * *
- * * This is how the trace record is structured and will
- * * be saved into the ring buffer. These are the fields
- * * that will be exposed to readers.
- * *
- * * ctf_integer(pid_t, prev_pid, prev->pid) is equivalent
- * * to a standard declaraton:
- * *
- * * pid_t prev_pid;
- * *
- * * followed by an assignment:
- * *
- * * prev_pid = prev->pid;
- * *
- * * ctf_array(char, prev_comm, prev->comm, TASK_COMM_LEN) is
- * * equivalent to:
- * *
- * * char prev_comm[TASK_COMM_LEN];
- * *
- * * followed by an assignment:
- * *
- * * memcpy(prev_comm, prev->comm, TASK_COMM_LEN);
- * *
- *
- * TP_FIELDS(
- * ctf_array(char, prev_comm, prev->comm, TASK_COMM_LEN)
- * ctf_integer(pid_t, prev_pid, prev->pid)
- * ctf_integer(int, prev_prio, prev->prio)
- * ctf_array(char, next_comm, next->comm, TASK_COMM_LEN)
- * ctf_integer(pid_t, next_pid, next->pid)
- * ctf_integer(int, next_prio, next->prio)
- * )
- * )
- *
- * Do _NOT_ add comma (,) nor semicolon (;) after the TRACEPOINT_EVENT
- * declaration.
- *
- * The TRACEPOINT_SYSTEM must be defined when declaring a
- * TRACEPOINT_EVENT. See ust/tracepoint-event.h for information about
- * usage of other macros controlling TRACEPOINT_EVENT.
+ * the provider:event identifier is limited to 127 characters.
*/
-#define TRACEPOINT_EVENT(name, proto, args, fields) \
- _DECLARE_TRACEPOINT(name, TP_PARAMS(proto), TP_PARAMS(args))
-
-#define TRACEPOINT_EVENT_CLASS(name, proto, args, fields)
-#define TRACEPOINT_EVENT_INSTANCE(template, name, proto, args) \
- _DECLARE_TRACEPOINT(name, TP_PARAMS(proto), TP_PARAMS(args))
+#define TRACEPOINT_EVENT(provider, name, args, fields) \
+ _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \
+ _DEFINE_TRACEPOINT(provider, name, _TP_PARAMS(args))
-/*
- * Declaration of tracepoints that take 0 argument.
- */
-#define TRACEPOINT_EVENT_NOARGS(name, fields) \
- _DECLARE_TRACEPOINT_NOARGS(name)
+#define TRACEPOINT_EVENT_CLASS(provider, name, args, fields)
-#define TRACEPOINT_EVENT_CLASS_NOARGS(name, fields)
-#define TRACEPOINT_EVENT_INSTANCE_NOARGS(template, name) \
- _DECLARE_TRACEPOINT_NOARGS(name)
+#define TRACEPOINT_EVENT_INSTANCE(provider, _template, name, args) \
+ _DECLARE_TRACEPOINT(provider, name, _TP_PARAMS(args)) \
+ _DEFINE_TRACEPOINT(provider, name, _TP_PARAMS(args))
#endif /* #ifndef TRACEPOINT_EVENT */
#ifndef TRACEPOINT_LOGLEVEL
/*
- * Tracepoint Loglevel Declaration Facility
- *
- * This is a place-holder the tracepoint loglevel declaration,
- * overridden by the tracer implementation.
+ * Tracepoint Loglevels
*
* 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.
- *
- * TRACEPOINT_LOGLEVEL_ENUM(
- * 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)
- * )
- *
- * 2) Then, 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_LOGLEVEL(< [com_company_]project_[component_]event >,
+ * The loglevels go from 0 to 14. Higher numbers imply the most
+ * verbosity (higher event throughput expected.
+ *
+ * Loglevels 0 through 6, and loglevel 14, match syslog(3) loglevels
+ * semantic. Loglevels 7 through 13 offer more fine-grained selection of
+ * debug information.
+ *
+ * TRACE_EMERG 0
+ * system is unusable
+ *
+ * TRACE_ALERT 1
+ * action must be taken immediately
+ *
+ * TRACE_CRIT 2
+ * critical conditions
+ *
+ * TRACE_ERR 3
+ * error conditions
+ *
+ * TRACE_WARNING 4
+ * warning conditions
+ *
+ * TRACE_NOTICE 5
+ * normal, but significant, condition
+ *
+ * TRACE_INFO 6
+ * informational message
+ *
+ * TRACE_DEBUG_SYSTEM 7
+ * debug information with system-level scope (set of programs)
+ *
+ * TRACE_DEBUG_PROGRAM 8
+ * debug information with program-level scope (set of processes)
+ *
+ * TRACE_DEBUG_PROCESS 9
+ * debug information with process-level scope (set of modules)
+ *
+ * TRACE_DEBUG_MODULE 10
+ * debug information with module (executable/library) scope (set of units)
+ *
+ * TRACE_DEBUG_UNIT 11
+ * debug information with compilation unit scope (set of functions)
+ *
+ * TRACE_DEBUG_FUNCTION 12
+ * debug information with function-level scope
+ *
+ * TRACE_DEBUG_LINE 13
+ * debug information with line-level scope (TRACEPOINT_EVENT default)
+ *
+ * TRACE_DEBUG 14
+ * 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 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 >)
*
- * The TRACEPOINT_SYSTEM must be defined when declaring a
- * TRACEPOINT_LOGLEVEL_ENUM and TRACEPOINT_LOGLEVEL. The tracepoint
- * loglevel enumeration apply to the entire TRACEPOINT_SYSTEM. Only one
- * tracepoint loglevel enumeration should be declared per tracepoint
- * system.
+ * The TRACEPOINT_PROVIDER must be already declared before declaring a
+ * TRACEPOINT_LOGLEVEL.
*/
-#define TRACEPOINT_LOGLEVEL_ENUM()
-#define TRACEPOINT_LOGLEVEL(name, loglevel)
+enum {
+ TRACE_EMERG = 0,
+ TRACE_ALERT = 1,
+ TRACE_CRIT = 2,
+ TRACE_ERR = 3,
+ TRACE_WARNING = 4,
+ TRACE_NOTICE = 5,
+ TRACE_INFO = 6,
+ TRACE_DEBUG_SYSTEM = 7,
+ TRACE_DEBUG_PROGRAM = 8,
+ TRACE_DEBUG_PROCESS = 9,
+ TRACE_DEBUG_MODULE = 10,
+ TRACE_DEBUG_UNIT = 11,
+ TRACE_DEBUG_FUNCTION = 12,
+ TRACE_DEBUG_LINE = 13,
+ TRACE_DEBUG = 14,
+};
+
+#define TRACEPOINT_LOGLEVEL(provider, name, loglevel)
#endif /* #ifndef TRACEPOINT_LOGLEVEL */
-#ifdef __cplusplus
-}
-#endif
+#ifndef TRACEPOINT_MODEL_EMF_URI
+
+#define TRACEPOINT_MODEL_EMF_URI(provider, name, uri)
-#endif /* _UST_TRACEPOINT_H */
+#endif /* #ifndef TRACEPOINT_MODEL_EMF_URI */