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_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP 26 #define SHARE_VM_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP 27 28 #include "memory/allocation.hpp" 29 #include "jfr/utilities/jfrTypes.hpp" 30 31 #define USED_BIT 1 32 #define METHOD_USED_BIT (USED_BIT << 2) 33 #define EPOCH_1_SHIFT 0 34 #define EPOCH_2_SHIFT 1 35 #define LEAKP_SHIFT 8 36 37 #define USED_EPOCH_1_BIT (USED_BIT << EPOCH_1_SHIFT) 38 #define USED_EPOCH_2_BIT (USED_BIT << EPOCH_2_SHIFT) 39 #define LEAKP_USED_EPOCH_1_BIT (USED_EPOCH_1_BIT << LEAKP_SHIFT) 40 #define LEAKP_USED_EPOCH_2_BIT (USED_EPOCH_2_BIT << LEAKP_SHIFT) 41 #define METHOD_USED_EPOCH_1_BIT (METHOD_USED_BIT << EPOCH_1_SHIFT) 42 #define METHOD_USED_EPOCH_2_BIT (METHOD_USED_BIT << EPOCH_2_SHIFT) 43 #define METHOD_AND_CLASS_IN_USE_BITS (METHOD_USED_BIT | USED_BIT) 44 #define METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS (METHOD_AND_CLASS_IN_USE_BITS << EPOCH_1_SHIFT) 45 #define METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS (METHOD_AND_CLASS_IN_USE_BITS << EPOCH_2_SHIFT) 46 47 class JfrTraceIdEpoch : AllStatic { 48 friend class JfrCheckpointManager; 49 private: 50 static bool _epoch_state; 51 static void shift_epoch(); 52 53 public: 54 static u1 epoch() { 55 return _epoch_state; 56 } 57 58 static jlong epoch_address() { 59 return (jlong)&_epoch_state; 60 } 61 62 static u1 current() { 63 return _epoch_state ? (u1)1 : (u1)0; 64 } 65 66 static u1 previous() { 67 return _epoch_state ? (u1)0 : (u1)1; 68 } 69 70 static traceid in_use_this_epoch_bit() { 71 return _epoch_state ? USED_EPOCH_2_BIT : USED_EPOCH_1_BIT; 72 } 73 74 static traceid in_use_prev_epoch_bit() { 75 return _epoch_state ? USED_EPOCH_1_BIT : USED_EPOCH_2_BIT; 76 } 77 78 static traceid leakp_in_use_this_epoch_bit() { 79 return _epoch_state ? LEAKP_USED_EPOCH_2_BIT : LEAKP_USED_EPOCH_1_BIT; 80 } 81 82 static traceid leakp_in_use_prev_epoch_bit() { 83 return _epoch_state ? LEAKP_USED_EPOCH_1_BIT : LEAKP_USED_EPOCH_2_BIT; 84 } 85 86 static traceid method_in_use_this_epoch_bit() { 87 return _epoch_state ? METHOD_USED_EPOCH_2_BIT : METHOD_USED_EPOCH_1_BIT; 88 } 89 90 static traceid method_in_use_prev_epoch_bit() { 91 return _epoch_state ? METHOD_USED_EPOCH_1_BIT : METHOD_USED_EPOCH_2_BIT; 92 } 93 94 static traceid method_and_class_in_use_this_epoch_bits() { 95 return _epoch_state ? METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS : METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS; 96 } 97 98 static traceid method_and_class_in_use_prev_epoch_bits() { 99 return _epoch_state ? METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS : METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS; 100 } 101 }; 102 103 #endif // SHARE_VM_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP