X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=include%2Flttng%2Ftracepoint.h;h=1734c1b7ac8d6c0a5aaedcc9c5e9c4f3db8effc4;hb=0cb03c850dedb8f1e7f11e2e47764aa4d3ba313b;hp=3d54864fcf578ebc9fd50bfa69f2537334ef5dad;hpb=4495dd39c05739d0fb2bc463b7c093d2459ce2b6;p=lttng-ust.git diff --git a/include/lttng/tracepoint.h b/include/lttng/tracepoint.h index 3d54864f..1734c1b7 100644 --- a/include/lttng/tracepoint.h +++ b/include/lttng/tracepoint.h @@ -13,15 +13,25 @@ * * 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 +#include #include #include #include #include /* for dlopen */ #include /* for memset */ -#include #include /* for sdt */ +#include #ifdef LTTNG_UST_HAVE_SDT_INTEGRATION #define SDT_USE_VARIADIC @@ -34,11 +44,17 @@ extern "C" { #endif +#define tracepoint_enabled(provider, name) \ + caa_unlikely(__tracepoint_##provider##___##name.state) + +#define do_tracepoint(provider, name, ...) \ + __tracepoint_cb_##provider##___##name(__VA_ARGS__) + #define tracepoint(provider, name, ...) \ do { \ STAP_PROBEV(provider, name, ## __VA_ARGS__); \ - if (caa_unlikely(__tracepoint_##provider##___##name.state)) \ - __tracepoint_cb_##provider##___##name(__VA_ARGS__); \ + if (tracepoint_enabled(provider, name)) \ + do_tracepoint(provider, name, __VA_ARGS__); \ } while (0) #define TP_ARGS(...) __VA_ARGS__ @@ -135,20 +151,28 @@ extern "C" { #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); \ 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) \ @@ -157,32 +181,41 @@ 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: * shared across objects in a module/main executable. */ -struct tracepoint_dlopen { +struct lttng_ust_tracepoint_dlopen { void *liblttngust_handle; - int (*tracepoint_register_lib)(struct tracepoint * const *tracepoints_start, + int (*tracepoint_register_lib)(struct lttng_ust_tracepoint * const *tracepoints_start, int tracepoints_count); - int (*tracepoint_unregister_lib)(struct tracepoint * const *tracepoints_start); + int (*tracepoint_unregister_lib)(struct lttng_ust_tracepoint * const *tracepoints_start); #ifndef _LGPL_SOURCE void (*rcu_read_lock_sym_bp)(void); void (*rcu_read_unlock_sym_bp)(void); @@ -190,10 +223,106 @@ struct tracepoint_dlopen { #endif }; -extern struct tracepoint_dlopen tracepoint_dlopen; +extern struct lttng_ust_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 lttng_ust_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 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 @@ -221,7 +350,7 @@ extern struct tracepoint_dlopen tracepoint_dlopen; static const char __tp_strtab_##_provider##___##_name[] \ __attribute__((section("__tracepoints_strings"))) = \ #_provider ":" #_name; \ - struct tracepoint __tracepoint_##_provider##___##_name \ + struct lttng_ust_tracepoint __tracepoint_##_provider##___##_name \ __attribute__((section("__tracepoints"))) = \ { \ __tp_strtab_##_provider##___##_name, \ @@ -229,72 +358,58 @@ extern struct tracepoint_dlopen tracepoint_dlopen; NULL, \ _TRACEPOINT_UNDEFINED_REF(_provider), \ _TP_EXTRACT_STRING(_args), \ + { }, \ }; \ - static struct tracepoint * __tracepoint_ptr_##_provider##___##_name \ + static struct lttng_ust_tracepoint * \ + __tracepoint_ptr_##_provider##___##_name \ __attribute__((used, section("__tracepoints_ptrs"))) = \ &__tracepoint_##_provider##___##_name; -/* - * 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"))); -struct tracepoint_dlopen tracepoint_dlopen - __attribute__((weak, visibility("hidden"))); - -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; - - tracepoint_dlopen.liblttngust_handle = - dlopen("liblttng-ust-tracepoint.so.0", RTLD_NOW | RTLD_GLOBAL); + 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_dlopen.tracepoint_register_lib = - URCU_FORCE_CAST(int (*)(struct tracepoint * const *, int), + URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *, int), dlsym(tracepoint_dlopen.liblttngust_handle, "tracepoint_register_lib")); tracepoint_dlopen.tracepoint_unregister_lib = - URCU_FORCE_CAST(int (*)(struct tracepoint * const *), + URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *), dlsym(tracepoint_dlopen.liblttngust_handle, "tracepoint_unregister_lib")); -#ifndef _LGPL_SOURCE - tracepoint_dlopen.rcu_read_lock_sym_bp = - URCU_FORCE_CAST(void (*)(void), - dlsym(tracepoint_dlopen.liblttngust_handle, - "tp_rcu_read_lock_bp")); - tracepoint_dlopen.rcu_read_unlock_sym_bp = - URCU_FORCE_CAST(void (*)(void), - dlsym(tracepoint_dlopen.liblttngust_handle, - "tp_rcu_read_unlock_bp")); - tracepoint_dlopen.rcu_dereference_sym_bp = - URCU_FORCE_CAST(void *(*)(void *p), - dlsym(tracepoint_dlopen.liblttngust_handle, - "tp_rcu_dereference_sym_bp")); -#endif - tracepoint_dlopen.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_dlopen.tracepoint_unregister_lib) tracepoint_dlopen.tracepoint_unregister_lib(__start___tracepoints_ptrs); - if (tracepoint_dlopen.liblttngust_handle) { + if (tracepoint_dlopen.liblttngust_handle && !__tracepoint_registered) { ret = dlclose(tracepoint_dlopen.liblttngust_handle); - assert(!ret); + if (ret) { + fprintf(stderr, "Error (%d) in dlclose\n", ret); + abort(); + } memset(&tracepoint_dlopen, 0, sizeof(tracepoint_dlopen)); } } @@ -463,7 +578,7 @@ static void __attribute__((destructor)) __tracepoints__destroy(void) * 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 @@ -499,3 +614,9 @@ 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 */