-/*
- * SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- */
+// SPDX-FileCopyrightText: 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+//
+// SPDX-License-Identifier: MIT
#ifndef _LTTNG_UST_TRACEPOINT_H
#define _LTTNG_UST_TRACEPOINT_H
#include <stdlib.h>
#include <lttng/tracepoint-types.h>
#include <lttng/tracepoint-rcu.h>
+#include <lttng/ust-utils.h>
+#include <sys/types.h>
+#include <unistd.h>
+
#include <urcu/compiler.h>
#include <urcu/system.h>
#include <dlfcn.h> /* for dlopen */
#include <string.h> /* for memset */
+#include <stdbool.h>
#include <lttng/ust-config.h> /* for sdt */
#include <lttng/ust-compiler.h>
#include <lttng/ust-tracer.h>
#include <lttng/ust-api-compat.h>
+#if (defined(__cplusplus) && (__cplusplus <= 199711L))
+#error "C++11 support is required to build tracepoints and providers as C++"
+#endif
+
#define LTTNG_UST_TRACEPOINT_NAME_LEN_MAX 256
#ifdef LTTNG_UST_HAVE_SDT_INTEGRATION
lttng_ust_tracepoint_provider_unregister(provider_name, event_name, func, data); \
}
-extern int lttng_ust_tracepoint_provider_register(const char *provider_name, const char *event_name,
+/*
+ * Registration of tracepoint provider probe functions with
+ * lttng_ust_tracepoint_provider_register, unregistration with
+ * lttng_ust_tracepoint_provider_unregister.
+ */
+int lttng_ust_tracepoint_provider_register(const char *provider_name, const char *event_name,
void (*func)(void), void *data, const char *signature);
-extern int lttng_ust_tracepoint_provider_unregister(const char *provider_name, const char *event_name,
+int lttng_ust_tracepoint_provider_unregister(const char *provider_name, const char *event_name,
void (*func)(void), void *data);
+/*
+ * Registration of tracepoint instrumentation modules with lttng_ust_tracepoint_module_register,
+ * unregistration with lttng_ust_tracepoint_module_unregister.
+ */
+int lttng_ust_tracepoint_module_register(struct lttng_ust_tracepoint * const *tracepoints_start,
+ int tracepoints_count);
+int lttng_ust_tracepoint_module_unregister(struct lttng_ust_tracepoint * const *tracepoints_start);
+
/*
* tracepoint dynamic linkage handling (callbacks). Hidden visibility:
* shared across objects in a module/main executable.
void *liblttngust_handle;
- int (*lttng_ust_tracepoint_register_lib)(struct lttng_ust_tracepoint * const *tracepoints_start,
+ int (*lttng_ust_tracepoint_module_register)(struct lttng_ust_tracepoint * const *tracepoints_start,
int tracepoints_count);
- int (*lttng_ust_tracepoint_unregister_lib)(struct lttng_ust_tracepoint * const *tracepoints_start);
+ int (*lttng_ust_tracepoint_module_unregister)(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);
}
#endif
+/*
+ * Use getenv() directly and bypass lttng-ust helper functions
+ * because we may not have access to lttng-ust shared libraries.
+ */
+#ifdef LTTNG_UST_DEBUG
+static inline
+bool lttng_ust_tracepoint_logging_debug_enabled(void)
+{
+ return true;
+}
+#else /* #ifdef LTTNG_UST_DEBUG */
+static inline
+bool lttng_ust_tracepoint_logging_debug_enabled(void)
+{
+ return getenv("LTTNG_UST_DEBUG");
+}
+#endif /* #ifdef LTTNG_UST_DEBUG */
+
+#ifdef LTTNG_UST_ABORT_ON_CRITICAL
+static inline
+bool lttng_ust_tracepoint_logging_abort_on_critical_enabled(void)
+{
+ return true;
+}
+#else /* #ifdef LTTNG_UST_ABORT_ON_CRITICAL */
+static inline
+bool lttng_ust_tracepoint_logging_abort_on_critical_enabled(void)
+{
+ return getenv("LTTNG_UST_ABORT_ON_CRITICAL");
+}
+#endif
+
+#define LTTNG_UST_TRACEPOINT_THIS_IP \
+ ({ __label__ here; here: &&here; })
+
+static void
+lttng_ust_tracepoints_print_disabled_message(void)
+{
+ if (lttng_ust_tracepoint_logging_debug_enabled())
+ fprintf(stderr, "lttng-ust-tracepoint [%ld]: Critical: dlopen() failed to find '%s', tracepoints in this binary won't be registered. "
+ "(at addr=%p in %s() at " __FILE__ ":" lttng_ust_stringify(__LINE__) ")\n",
+ (long) getpid(),
+ LTTNG_UST_TRACEPOINT_LIB_SONAME,
+ LTTNG_UST_TRACEPOINT_THIS_IP,
+ __func__);
+ if (lttng_ust_tracepoint_logging_abort_on_critical_enabled())
+ abort();
+}
+
static void
lttng_ust__tracepoints__init(void)
- lttng_ust_notrace __attribute__((constructor));
+ lttng_ust_notrace __attribute__((constructor(LTTNG_UST_CONSTRUCTOR_PRIO)));
static void
lttng_ust__tracepoints__init(void)
{
if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle =
dlopen(LTTNG_UST_TRACEPOINT_LIB_SONAME, RTLD_NOW | RTLD_GLOBAL);
- if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
+ if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle) {
+ lttng_ust_tracepoints_print_disabled_message();
return;
+ }
lttng_ust_tracepoint__init_urcu_sym();
}
static void
lttng_ust__tracepoints__destroy(void)
- lttng_ust_notrace __attribute__((destructor));
+ lttng_ust_notrace __attribute__((destructor(LTTNG_UST_CONSTRUCTOR_PRIO)));
static void
lttng_ust__tracepoints__destroy(void)
{
# endif
#endif /* #if LTTNG_UST_COMPAT_API(0) */
+#if LTTNG_UST_COMPAT_API(0)
+#define tracepoint lttng_ust_tracepoint
+#define do_tracepoint lttng_ust_do_tracepoint
+#define tracepoint_enabled lttng_ust_tracepoint_enabled
+#define TP_ARGS LTTNG_UST_TP_ARGS
+#endif /* #if LTTNG_UST_COMPAT_API(0) */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LTTNG_UST_TRACEPOINT_H */
+
+/* The following declarations must be outside re-inclusion protection. */
+
#ifdef LTTNG_UST_TRACEPOINT_DEFINE
+#ifndef _LTTNG_UST_TRACEPOINT_DEFINE_ONCE
+#define _LTTNG_UST_TRACEPOINT_DEFINE_ONCE
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
/*
* These weak symbols, the constructor, and destructor take care of
* registering only _one_ instance of the tracepoints per shared-ojbect
*/
#define LTTNG_UST__TP_EXTRACT_STRING(...) #__VA_ARGS__
+#undef LTTNG_UST__DEFINE_TRACEPOINT
#define LTTNG_UST__DEFINE_TRACEPOINT(_provider, _name, _args) \
lttng_ust_tracepoint_validate_name_len(_provider, _name); \
extern int lttng_ust_tracepoint_provider_##_provider \
static void
lttng_ust__tracepoints__ptrs_init(void)
- lttng_ust_notrace __attribute__((constructor));
+ lttng_ust_notrace __attribute__((constructor(LTTNG_UST_CONSTRUCTOR_PRIO)));
static void
lttng_ust__tracepoints__ptrs_init(void)
{
if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle =
dlopen(LTTNG_UST_TRACEPOINT_LIB_SONAME, RTLD_NOW | RTLD_GLOBAL);
- if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle)
+ if (!lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle) {
+ lttng_ust_tracepoints_print_disabled_message();
return;
+ }
if (!lttng_ust_tracepoint_destructors_syms_ptr)
lttng_ust_tracepoint_destructors_syms_ptr = <tng_ust_tracepoint_destructors_syms;
- lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_register_lib =
+ lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_register =
URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *, int),
dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
- "lttng_ust_tracepoint_register_lib"));
- lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_unregister_lib =
+ "lttng_ust_tracepoint_module_register"));
+ lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_unregister =
URCU_FORCE_CAST(int (*)(struct lttng_ust_tracepoint * const *),
dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
- "lttng_ust_tracepoint_unregister_lib"));
+ "lttng_ust_tracepoint_module_unregister"));
lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_disable_destructors =
URCU_FORCE_CAST(void (*)(void),
dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
dlsym(lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle,
"lttng_ust_tp_get_destructors_state"));
lttng_ust_tracepoint__init_urcu_sym();
- if (lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_register_lib) {
- lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_register_lib(__start_lttng_ust_tracepoints_ptrs,
+ if (lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_register) {
+ lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_register(__start_lttng_ust_tracepoints_ptrs,
__stop_lttng_ust_tracepoints_ptrs -
__start_lttng_ust_tracepoints_ptrs);
}
static void
lttng_ust__tracepoints__ptrs_destroy(void)
- lttng_ust_notrace __attribute__((destructor));
+ lttng_ust_notrace __attribute__((destructor(LTTNG_UST_CONSTRUCTOR_PRIO)));
static void
lttng_ust__tracepoints__ptrs_destroy(void)
{
lttng_ust_tracepoint_dlopen_ptr = <tng_ust_tracepoint_dlopen;
if (!lttng_ust_tracepoint_destructors_syms_ptr)
lttng_ust_tracepoint_destructors_syms_ptr = <tng_ust_tracepoint_destructors_syms;
- if (lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_unregister_lib)
- lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_unregister_lib(__start_lttng_ust_tracepoints_ptrs);
+ if (lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_unregister)
+ lttng_ust_tracepoint_dlopen_ptr->lttng_ust_tracepoint_module_unregister(__start_lttng_ust_tracepoints_ptrs);
if (lttng_ust_tracepoint_dlopen_ptr->liblttngust_handle
&& lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state
&& lttng_ust_tracepoint_destructors_syms_ptr->tracepoint_get_destructors_state()
}
}
-#else /* LTTNG_UST_TRACEPOINT_DEFINE */
-
-#define LTTNG_UST__DEFINE_TRACEPOINT(_provider, _name, _args)
-
-#endif /* #else LTTNG_UST_TRACEPOINT_DEFINE */
-
-#if LTTNG_UST_COMPAT_API(0)
-#define tracepoint lttng_ust_tracepoint
-#define do_tracepoint lttng_ust_do_tracepoint
-#define tracepoint_enabled lttng_ust_tracepoint_enabled
-#define TP_ARGS LTTNG_UST_TP_ARGS
-#endif /* #if LTTNG_UST_COMPAT_API(0) */
-
#ifdef __cplusplus
}
#endif
-#endif /* _LTTNG_UST_TRACEPOINT_H */
+#endif /* _LTTNG_UST_TRACEPOINT_DEFINE_ONCE */
-/* The following declarations must be outside re-inclusion protection. */
+#else /* LTTNG_UST_TRACEPOINT_DEFINE */
+
+#undef LTTNG_UST__DEFINE_TRACEPOINT
+#define LTTNG_UST__DEFINE_TRACEPOINT(_provider, _name, _args)
+
+#endif /* #else LTTNG_UST_TRACEPOINT_DEFINE */
/*
* LTTNG_UST_TRACEPOINT_HIDDEN_DEFINITION: Define this before including
#define LTTNG_UST_TRACEPOINT_EVENT_CLASS(provider, name, args, fields)
-#define LTTNG_UST_TRACEPOINT_EVENT_INSTANCE(provider, _template, name, args) \
+#define LTTNG_UST_TRACEPOINT_EVENT_INSTANCE(template_provider, template_name, provider, name, args) \
LTTNG_UST__DECLARE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args)) \
LTTNG_UST__DEFINE_TRACEPOINT(provider, name, LTTNG_UST__TP_PARAMS(args))
#if LTTNG_UST_COMPAT_API(0)
#define TRACEPOINT_EVENT LTTNG_UST_TRACEPOINT_EVENT
#define TRACEPOINT_EVENT_CLASS LTTNG_UST_TRACEPOINT_EVENT_CLASS
-#define TRACEPOINT_EVENT_INSTANCE LTTNG_UST_TRACEPOINT_EVENT_INSTANCE
+#define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, args) \
+ LTTNG_UST_TRACEPOINT_EVENT_INSTANCE(_provider, _template, \
+ _provider, _name, LTTNG_UST__TP_PARAMS(args))
+
#endif /* #if LTTNG_UST_COMPAT_API(0) */
#endif /* #ifndef LTTNG_UST_TRACEPOINT_EVENT */
projects / lttng-ust.git / blobdiff