X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;ds=sidebyside;f=include%2Flttng%2Ftracepoint.h;h=66e2abd7c505a296389c4bc691a809eed4c8b812;hb=f02baefb3ba4d5493816d63f65625ba4269224d2;hp=e1de626cc6b54ff5db9f7935099b99c24017f4c2;hpb=a8909ba54718ed54cefb1b839a5d41a065df09f9;p=lttng-ust.git diff --git a/include/lttng/tracepoint.h b/include/lttng/tracepoint.h index e1de626c..66e2abd7 100644 --- a/include/lttng/tracepoint.h +++ b/include/lttng/tracepoint.h @@ -13,14 +13,23 @@ * * 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 @@ -136,16 +145,21 @@ 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 lttng_ust_notrace \ +static inline __attribute__((always_inline)) lttng_ust_notrace \ void __tracepoint_cb_##_provider##___##_name(_TP_ARGS_PROTO(__VA_ARGS__)); \ -static inline \ +static \ 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); \ @@ -205,8 +219,104 @@ struct tracepoint_dlopen { 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 @@ -242,35 +352,22 @@ extern struct tracepoint_dlopen tracepoint_dlopen; NULL, \ _TRACEPOINT_UNDEFINED_REF(_provider), \ _TP_EXTRACT_STRING(_args), \ + { }, \ }; \ static struct 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 lttng_ust_notrace __attribute__((constructor)) -__tracepoints__init(void); +__tracepoints__ptrs_init(void); static void -__tracepoints__init(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 = @@ -281,39 +378,31 @@ __tracepoints__init(void) URCU_FORCE_CAST(int (*)(struct 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 lttng_ust_notrace __attribute__((destructor)) -__tracepoints__destroy(void); +__tracepoints__ptrs_destroy(void); static void -__tracepoints__destroy(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)); } } @@ -518,3 +607,9 @@ 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 */