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_CHECKPOINT_CONSTANT_TRACEID_JFRTRACEIDEPOCH_HPP 26 #define SHARE_VM_JFR_CHECKPOINT_CONSTANT_TRACEID_JFRTRACEIDEPOCH_HPP 27 28 #include "memory/allocation.hpp" 29 #include "jfr/utilities/jfrTypes.hpp" 30 #include "trace/traceMacros.hpp" 31 32 class JfrTraceIdEpoch : AllStatic { 33 friend class JfrCheckpointManager; 34 private: 35 static bool _epoch_state; 36 static void shift_epoch(); 37 38 public: 39 static bool epoch() { 40 return _epoch_state; 41 } 42 43 static jlong epoch_address() { 44 return (jlong)&_epoch_state; 45 } 46 47 static u1 current() { 48 return _epoch_state ? (u1)1 : (u1)0; 49 } 50 51 static u1 previous() { 52 return _epoch_state ? (u1)0 : (u1)1; 53 } 54 55 static traceid in_use_this_epoch_bit() { 56 return _epoch_state ? USED_EPOCH_2_BIT : USED_EPOCH_1_BIT; 57 } 58 59 static traceid in_use_prev_epoch_bit() { 60 return _epoch_state ? USED_EPOCH_1_BIT : USED_EPOCH_2_BIT; 61 } 62 63 static traceid leakp_in_use_this_epoch_bit() { 64 return _epoch_state ? LEAKP_USED_EPOCH_2_BIT : LEAKP_USED_EPOCH_1_BIT; 65 } 66 67 static traceid leakp_in_use_prev_epoch_bit() { 68 return _epoch_state ? LEAKP_USED_EPOCH_1_BIT : LEAKP_USED_EPOCH_2_BIT; 69 } 70 71 static traceid method_in_use_this_epoch_bit() { 72 return _epoch_state ? METHOD_USED_EPOCH_2_BIT : METHOD_USED_EPOCH_1_BIT; 73 } 74 75 static traceid method_in_use_prev_epoch_bit() { 76 return _epoch_state ? METHOD_USED_EPOCH_1_BIT : METHOD_USED_EPOCH_2_BIT; 77 } 78 79 static traceid method_and_class_in_use_this_epoch_bits() { 80 return _epoch_state ? METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS : METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS; 81 } 82 83 static traceid method_and_class_in_use_prev_epoch_bits() { 84 return _epoch_state ? METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS : METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS; 85 } 86 }; 87 88 #endif // SHARE_VM_JFR_CHECKPOINT_CONSTANT_TRACEID_JFRTRACEIDEPOCH_HPP