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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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#ifndef SHARE_JFR_RECORDER_SERVICE_JFREVENT_HPP
#define SHARE_JFR_RECORDER_SERVICE_JFREVENT_HPP
#include "jfr/recorder/jfrEventSetting.inline.hpp"
#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"
#include "jfr/utilities/jfrTime.hpp"
#include "jfr/utilities/jfrTypes.hpp"
#include "jfr/writers/jfrNativeEventWriter.hpp"
#include "runtime/thread.hpp"
#include "utilities/exceptions.hpp"
#include "utilities/ticks.hpp"
#ifdef ASSERT
#include "utilities/bitMap.hpp"
#endif
#ifdef ASSERT
class JfrEventVerifier {
template <typename>
friend class JfrEvent;
private:
// verification of event fields
BitMap::bm_word_t _verification_storage[1];
BitMapView _verification_bit_map;
bool _committed;
JfrEventVerifier();
void check(BitMap::idx_t field_idx) const;
void set_field_bit(size_t field_idx);
bool verify_field_bit(size_t field_idx) const;
void set_committed();
void clear_committed();
bool committed() const;
};
#endif // ASSERT
template <typename T>
class JfrEvent {
private:
jlong _start_time;
jlong _end_time;
bool _started;
protected:
JfrEvent(EventStartTime timing=TIMED) : _start_time(0), _end_time(0), _started(false)
#ifdef ASSERT
, _verifier()
#endif
{
if (T::is_enabled()) {
_started = true;
if (TIMED == timing && !T::isInstant) {
set_starttime(JfrTicks::now());
}
}
}
void commit() {
if (!should_commit()) {
return;
}
assert(!_verifier.committed(), "event already committed");
if (_start_time == 0) {
set_starttime(JfrTicks::now());
} else if (_end_time == 0) {
set_endtime(JfrTicks::now());
}
if (should_write()) {
write_event();
DEBUG_ONLY(_verifier.set_committed();)
}
}
public:
void set_starttime(const JfrTicks& time) {
_start_time = time.value();
}
void set_endtime(const JfrTicks& time) {
_end_time = time.value();
}
void set_starttime(const Ticks& time) {
_start_time = JfrTime::is_ft_enabled() ? time.ft_value() : time.value();
}
void set_endtime(const Ticks& time) {
_end_time = JfrTime::is_ft_enabled() ? time.ft_value() : time.value();
}
static bool is_enabled() {
return JfrEventSetting::is_enabled(T::eventId);
}
static bool is_stacktrace_enabled() {
return JfrEventSetting::has_stacktrace(T::eventId);
}
static JfrEventId id() {
return T::eventId;
}
static bool is_instant() {
return T::isInstant;
}
static bool is_requestable() {
return T::isRequestable;
}
static bool has_thread() {
return T::hasThread;
}
static bool has_stacktrace() {
return T::hasStackTrace;
}
bool should_commit() {
return _started;
}
private:
bool should_write() {
if (T::isInstant || T::isRequestable || T::hasCutoff) {
return true;
}
return (_end_time - _start_time) >= JfrEventSetting::threshold(T::eventId);
}
void write_event() {
DEBUG_ONLY(assert_precondition();)
Thread* const event_thread = Thread::current();
JfrThreadLocal* const tl = event_thread->jfr_thread_local();
JfrBuffer* const buffer = tl->native_buffer();
if (buffer == NULL) {
// most likely a pending OOM
return;
}
JfrNativeEventWriter writer(buffer, event_thread);
writer.write<u8>(T::eventId);
assert(_start_time != 0, "invariant");
writer.write(_start_time);
if (!(T::isInstant || T::isRequestable) || T::hasCutoff) {
assert(_end_time != 0, "invariant");
writer.write(_end_time - _start_time);
}
if (T::hasThread) {
writer.write(tl->thread_id());
}
if (T::hasStackTrace) {
if (is_stacktrace_enabled()) {
if (tl->has_cached_stack_trace()) {
writer.write(tl->cached_stack_trace_id());
} else {
writer.write(JfrStackTraceRepository::record(event_thread));
}
} else {
writer.write<traceid>(0);
}
}
// payload
static_cast<T*>(this)->writeData(writer);
}
#ifdef ASSERT
private:
// verification of event fields
JfrEventVerifier _verifier;
void assert_precondition() {
/**代码未完, 请加载全部代码(NowJava.com).**/