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/*
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* Copyright (c) 2016, 2018, 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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#ifndef SHARE_VM_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP
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#define SHARE_VM_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP
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#include "memory/allocation.hpp"
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#include "jfr/utilities/jfrTypes.hpp"
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#define USED_BIT 1
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#define METHOD_USED_BIT (USED_BIT << 2)
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#define EPOCH_1_SHIFT 0
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#define EPOCH_2_SHIFT 1
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#define LEAKP_SHIFT 8
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#define USED_EPOCH_1_BIT (USED_BIT << EPOCH_1_SHIFT)
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#define USED_EPOCH_2_BIT (USED_BIT << EPOCH_2_SHIFT)
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#define LEAKP_USED_EPOCH_1_BIT (USED_EPOCH_1_BIT << LEAKP_SHIFT)
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#define LEAKP_USED_EPOCH_2_BIT (USED_EPOCH_2_BIT << LEAKP_SHIFT)
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#define METHOD_USED_EPOCH_1_BIT (METHOD_USED_BIT << EPOCH_1_SHIFT)
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#define METHOD_USED_EPOCH_2_BIT (METHOD_USED_BIT << EPOCH_2_SHIFT)
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#define METHOD_AND_CLASS_IN_USE_BITS (METHOD_USED_BIT | USED_BIT)
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#define METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS (METHOD_AND_CLASS_IN_USE_BITS << EPOCH_1_SHIFT)
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#define METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS (METHOD_AND_CLASS_IN_USE_BITS << EPOCH_2_SHIFT)
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class JfrTraceIdEpoch : AllStatic {
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friend class JfrCheckpointManager;
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private:
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static bool _epoch_state;
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static void shift_epoch();
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public:
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static bool epoch() {
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return _epoch_state;
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}
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static jlong epoch_address() {
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return (jlong)&_epoch_state;
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}
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static u1 current() {
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return _epoch_state ? (u1)1 : (u1)0;
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}
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static u1 previous() {
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return _epoch_state ? (u1)0 : (u1)1;
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}
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static traceid in_use_this_epoch_bit() {
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return _epoch_state ? USED_EPOCH_2_BIT : USED_EPOCH_1_BIT;
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}
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static traceid in_use_prev_epoch_bit() {
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return _epoch_state ? USED_EPOCH_1_BIT : USED_EPOCH_2_BIT;
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}
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static traceid leakp_in_use_this_epoch_bit() {
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return _epoch_state ? LEAKP_USED_EPOCH_2_BIT : LEAKP_USED_EPOCH_1_BIT;
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}
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static traceid leakp_in_use_prev_epoch_bit() {
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return _epoch_state ? LEAKP_USED_EPOCH_1_BIT : LEAKP_USED_EPOCH_2_BIT;
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}
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static traceid method_in_use_this_epoch_bit() {
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return _epoch_state ? METHOD_USED_EPOCH_2_BIT : METHOD_USED_EPOCH_1_BIT;
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}
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static traceid method_in_use_prev_epoch_bit() {
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return _epoch_state ? METHOD_USED_EPOCH_1_BIT : METHOD_USED_EPOCH_2_BIT;
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}
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static traceid method_and_class_in_use_this_epoch_bits() {
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return _epoch_state ? METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS : METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS;
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}
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static traceid method_and_class_in_use_prev_epoch_bits() {
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return _epoch_state ? METHOD_AND_CLASS_IN_USE_EPOCH_1_BITS : METHOD_AND_CLASS_IN_USE_EPOCH_2_BITS;
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}
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};
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#endif // SHARE_VM_JFR_CHECKPOINT_TYPES_TRACEID_JFRTRACEIDEPOCH_HPP
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