1 /* 2 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_JFR_SUPPORT_JFRFLUSH_HPP 26 #define SHARE_VM_JFR_SUPPORT_JFRFLUSH_HPP 27 28 #include "jfr/recorder/storage/jfrBuffer.hpp" 29 #include "jfr/utilities/jfrTypes.hpp" 30 #include "memory/allocation.hpp" 31 32 class Thread; 33 34 class JfrFlush : public StackObj { 35 public: 36 typedef JfrBuffer Type; 37 JfrFlush(Type* old, size_t used, size_t requested, Thread* t); 38 Type* result() const { return _result; } 39 private: 40 Type* _result; 41 }; 42 43 void jfr_conditional_flush(JfrEventId id, size_t size, Thread* t); 44 bool jfr_is_event_enabled(JfrEventId id); 45 bool jfr_has_stacktrace_enabled(JfrEventId id); 46 bool jfr_save_stacktrace(Thread* t); 47 void jfr_clear_stacktrace(Thread* t); 48 49 template <typename Event> 50 class JfrConditionalFlush { 51 public: 52 typedef JfrBuffer Type; 53 JfrConditionalFlush(Thread* t) { 54 if (jfr_is_event_enabled(Event::eventId)) { 55 jfr_conditional_flush(Event::eventId, sizeof(Event), t); 56 } 57 } 58 }; 59 60 template <typename Event> 61 class JfrConditionalFlushWithStacktrace : public JfrConditionalFlush<Event> { 62 Thread* _t; 63 bool _owner; 64 public: 65 JfrConditionalFlushWithStacktrace(Thread* t) : JfrConditionalFlush<Event>(t), _t(t), _owner(false) { 66 if (Event::has_stacktrace() && jfr_has_stacktrace_enabled(Event::eventId)) { 67 _owner = jfr_save_stacktrace(t); 68 } 69 } 70 ~JfrConditionalFlushWithStacktrace() { 71 if (_owner) { 72 jfr_clear_stacktrace(_t); 73 } 74 } 75 }; 76 77 #endif // SHARE_VM_JFR_SUPPORT_JFRFLUSH_HPP