author | mgronlun |
Wed, 30 Oct 2019 19:43:52 +0100 | |
changeset 58863 | c16ac7a2eba4 |
parent 53244 | 9807daeb47c4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#ifndef SHARE_JFR_RECORDER_SERVICE_JFREVENT_HPP |
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#define SHARE_JFR_RECORDER_SERVICE_JFREVENT_HPP |
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#include "jfr/recorder/jfrEventSetting.inline.hpp" |
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#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp" |
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#include "jfr/utilities/jfrTime.hpp" |
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#include "jfr/utilities/jfrTypes.hpp" |
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#include "jfr/writers/jfrNativeEventWriter.hpp" |
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#include "runtime/thread.hpp" |
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#include "utilities/exceptions.hpp" |
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#include "utilities/ticks.hpp" |
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#ifdef ASSERT |
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#include "utilities/bitMap.hpp" |
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#endif |
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#ifdef ASSERT |
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class JfrEventVerifier { |
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template <typename> |
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friend class JfrEvent; |
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private: |
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// verification of event fields |
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BitMap::bm_word_t _verification_storage[1]; |
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BitMapView _verification_bit_map; |
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bool _committed; |
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JfrEventVerifier(); |
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void check(BitMap::idx_t field_idx) const; |
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void set_field_bit(size_t field_idx); |
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bool verify_field_bit(size_t field_idx) const; |
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void set_committed(); |
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void clear_committed(); |
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bool committed() const; |
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}; |
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#endif // ASSERT |
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template <typename T> |
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class JfrEvent { |
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private: |
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jlong _start_time; |
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jlong _end_time; |
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bool _started; |
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protected: |
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JfrEvent(EventStartTime timing=TIMED) : _start_time(0), _end_time(0), _started(false) |
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#ifdef ASSERT |
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, _verifier() |
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#endif |
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{ |
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if (T::is_enabled()) { |
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_started = true; |
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if (TIMED == timing && !T::isInstant) { |
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set_starttime(JfrTicks::now()); |
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} |
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} |
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} |
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void commit() { |
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if (!should_commit()) { |
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return; |
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} |
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assert(!_verifier.committed(), "event already committed"); |
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if (_start_time == 0) { |
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set_starttime(JfrTicks::now()); |
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} else if (_end_time == 0) { |
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set_endtime(JfrTicks::now()); |
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} |
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if (should_write()) { |
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write_event(); |
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DEBUG_ONLY(_verifier.set_committed();) |
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} |
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} |
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public: |
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void set_starttime(const JfrTicks& time) { |
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_start_time = time.value(); |
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} |
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void set_endtime(const JfrTicks& time) { |
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_end_time = time.value(); |
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} |
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void set_starttime(const Ticks& time) { |
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_start_time = JfrTime::is_ft_enabled() ? time.ft_value() : time.value(); |
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} |
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void set_endtime(const Ticks& time) { |
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_end_time = JfrTime::is_ft_enabled() ? time.ft_value() : time.value(); |
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} |
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static bool is_enabled() { |
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return JfrEventSetting::is_enabled(T::eventId); |
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} |
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static bool is_stacktrace_enabled() { |
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return JfrEventSetting::has_stacktrace(T::eventId); |
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} |
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static JfrEventId id() { |
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return T::eventId; |
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} |
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static bool is_instant() { |
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return T::isInstant; |
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} |
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static bool is_requestable() { |
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return T::isRequestable; |
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} |
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static bool has_thread() { |
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return T::hasThread; |
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} |
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static bool has_stacktrace() { |
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return T::hasStackTrace; |
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} |
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bool should_commit() { |
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return _started; |
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} |
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private: |
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bool should_write() { |
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if (T::isInstant || T::isRequestable || T::hasCutoff) { |
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return true; |
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} |
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return (_end_time - _start_time) >= JfrEventSetting::threshold(T::eventId); |
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} |
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void write_event() { |
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DEBUG_ONLY(assert_precondition();) |
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Thread* const event_thread = Thread::current(); |
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JfrThreadLocal* const tl = event_thread->jfr_thread_local(); |
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JfrBuffer* const buffer = tl->native_buffer(); |
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if (buffer == NULL) { |
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// most likely a pending OOM |
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return; |
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} |
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JfrNativeEventWriter writer(buffer, event_thread); |
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writer.write<u8>(T::eventId); |
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assert(_start_time != 0, "invariant"); |
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writer.write(_start_time); |
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if (!(T::isInstant || T::isRequestable) || T::hasCutoff) { |
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assert(_end_time != 0, "invariant"); |
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writer.write(_end_time - _start_time); |
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} |
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if (T::hasThread) { |
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writer.write(tl->thread_id()); |
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} |
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if (T::hasStackTrace) { |
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if (is_stacktrace_enabled()) { |
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if (tl->has_cached_stack_trace()) { |
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writer.write(tl->cached_stack_trace_id()); |
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} else { |
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writer.write(JfrStackTraceRepository::record(event_thread)); |
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} |
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} else { |
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writer.write<traceid>(0); |
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} |
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} |
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// payload |
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static_cast<T*>(this)->writeData(writer); |
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} |
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#ifdef ASSERT |
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private: |
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// verification of event fields |
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JfrEventVerifier _verifier; |
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void assert_precondition() { |
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assert(T::eventId >= (JfrEventId)NUM_RESERVED_EVENTS, "event id underflow invariant"); |
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assert(T::eventId < MaxJfrEventId, "event id overflow invariant"); |
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DEBUG_ONLY(static_cast<T*>(this)->verify()); |
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} |
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protected: |
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void set_field_bit(size_t field_idx) { |
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_verifier.set_field_bit(field_idx); |
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// it is ok to reuse an already committed event |
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// granted you provide new informational content |
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_verifier.clear_committed(); |
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} |
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bool verify_field_bit(size_t field_idx) const { |
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return _verifier.verify_field_bit(field_idx); |
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} |
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#endif // ASSERT |
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}; |
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parents:
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diff
changeset
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#endif // SHARE_JFR_RECORDER_SERVICE_JFREVENT_HPP |