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/*
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* Copyright (c) 2017, 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_RECORDER_CHECKPOINT_TYPES_JFRTYPESETUTILS_HPP
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#define SHARE_VM_JFR_RECORDER_CHECKPOINT_TYPES_JFRTYPESETUTILS_HPP
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#include "jfr/recorder/checkpoint/types/traceid/jfrTraceId.inline.hpp"
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#include "jfr/utilities/jfrAllocation.hpp"
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#include "jfr/utilities/jfrHashtable.hpp"
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#include "oops/klass.hpp"
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#include "oops/method.hpp"
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#include "utilities/growableArray.hpp"
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// Composite callback/functor building block
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template <typename T, typename Func1, typename Func2>
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class CompositeFunctor {
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private:
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Func1* _f;
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Func2* _g;
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public:
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CompositeFunctor(Func1* f, Func2* g) : _f(f), _g(g) {
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assert(f != NULL, "invariant");
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assert(g != NULL, "invariant");
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}
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bool operator()(T const& value) {
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return (*_f)(value) && (*_g)(value);
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}
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};
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class JfrArtifactClosure {
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public:
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virtual void do_artifact(const void* artifact) = 0;
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};
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template <typename T, typename Callback>
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class JfrArtifactCallbackHost : public JfrArtifactClosure {
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private:
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Callback* _callback;
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public:
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JfrArtifactCallbackHost(Callback* callback) : _callback(callback) {}
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void do_artifact(const void* artifact) {
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(*_callback)(reinterpret_cast<T const&>(artifact));
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}
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};
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template <typename FieldSelector, typename Letter>
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class KlassToFieldEnvelope {
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Letter* _letter;
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public:
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KlassToFieldEnvelope(Letter* letter) : _letter(letter) {}
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bool operator()(const Klass* klass) {
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typename FieldSelector::TypePtr t = FieldSelector::select(klass);
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return t != NULL ? (*_letter)(t) : true;
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}
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};
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template <typename T>
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void tag_leakp_artifact(T const& value, bool class_unload) {
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assert(value != NULL, "invariant");
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if (class_unload) {
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SET_LEAKP_USED_THIS_EPOCH(value);
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assert(LEAKP_USED_THIS_EPOCH(value), "invariant");
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} else {
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SET_LEAKP_USED_PREV_EPOCH(value);
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assert(LEAKP_USED_PREV_EPOCH(value), "invariant");
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}
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}
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template <typename T>
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class LeakpClearArtifact {
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bool _class_unload;
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public:
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LeakpClearArtifact(bool class_unload) : _class_unload(class_unload) {}
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bool operator()(T const& value) {
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if (_class_unload) {
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if (LEAKP_USED_THIS_EPOCH(value)) {
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LEAKP_UNUSE_THIS_EPOCH(value);
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}
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} else {
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if (LEAKP_USED_PREV_EPOCH(value)) {
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LEAKP_UNUSE_PREV_EPOCH(value);
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}
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}
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return true;
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}
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};
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template <typename T>
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class ClearArtifact {
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bool _class_unload;
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public:
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ClearArtifact(bool class_unload) : _class_unload(class_unload) {}
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bool operator()(T const& value) {
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if (_class_unload) {
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if (LEAKP_USED_THIS_EPOCH(value)) {
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LEAKP_UNUSE_THIS_EPOCH(value);
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}
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if (USED_THIS_EPOCH(value)) {
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UNUSE_THIS_EPOCH(value);
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}
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if (METHOD_USED_THIS_EPOCH(value)) {
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UNUSE_METHOD_THIS_EPOCH(value);
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}
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} else {
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if (LEAKP_USED_PREV_EPOCH(value)) {
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LEAKP_UNUSE_PREV_EPOCH(value);
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}
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if (USED_PREV_EPOCH(value)) {
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UNUSE_PREV_EPOCH(value);
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}
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if (METHOD_USED_PREV_EPOCH(value)) {
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UNUSE_METHOD_PREV_EPOCH(value);
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}
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}
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return true;
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}
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};
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template <>
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class ClearArtifact<const Method*> {
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bool _class_unload;
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public:
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ClearArtifact(bool class_unload) : _class_unload(class_unload) {}
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bool operator()(const Method* method) {
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if (_class_unload) {
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if (METHOD_FLAG_USED_THIS_EPOCH(method)) {
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CLEAR_METHOD_FLAG_USED_THIS_EPOCH(method);
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}
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} else {
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if (METHOD_FLAG_USED_PREV_EPOCH(method)) {
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CLEAR_METHOD_FLAG_USED_PREV_EPOCH(method);
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}
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}
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return true;
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}
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};
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template <typename T>
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class LeakPredicate {
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bool _class_unload;
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public:
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LeakPredicate(bool class_unload) : _class_unload(class_unload) {}
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bool operator()(T const& value) {
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return _class_unload ? LEAKP_USED_THIS_EPOCH(value) : LEAKP_USED_PREV_EPOCH(value);
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}
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};
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template <typename T>
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class UsedPredicate {
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bool _class_unload;
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public:
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UsedPredicate(bool class_unload) : _class_unload(class_unload) {}
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bool operator()(T const& value) {
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return _class_unload ? USED_THIS_EPOCH(value) : USED_PREV_EPOCH(value);
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}
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};
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template <typename T, int compare(const T&, const T&)>
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class UniquePredicate {
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private:
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GrowableArray<T> _seen;
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public:
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UniquePredicate(bool) : _seen() {}
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bool operator()(T const& value) {
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bool not_unique;
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_seen.template find_sorted<T, compare>(value, not_unique);
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if (not_unique) {
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return false;
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}
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_seen.template insert_sorted<compare>(value);
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return true;
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}
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};
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class MethodFlagPredicate {
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bool _class_unload;
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public:
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MethodFlagPredicate(bool class_unload) : _class_unload(class_unload) {}
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bool operator()(const Method* method) {
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return _class_unload ? METHOD_FLAG_USED_THIS_EPOCH(method) : METHOD_FLAG_USED_PREV_EPOCH(method);
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}
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};
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template <bool leakp>
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class MethodUsedPredicate {
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bool _class_unload;
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public:
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MethodUsedPredicate(bool class_unload) : _class_unload(class_unload) {}
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bool operator()(const Klass* klass) {
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assert(ANY_USED(klass), "invariant");
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if (_class_unload) {
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return leakp ? LEAKP_METHOD_USED_THIS_EPOCH(klass) : METHOD_USED_THIS_EPOCH(klass);
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}
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return leakp ? LEAKP_METHOD_USED_PREV_EPOCH(klass) : METHOD_USED_PREV_EPOCH(klass);
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}
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};
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class JfrSymbolId : public JfrCHeapObj {
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template <typename, typename, template<typename, typename> class, typename, size_t>
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friend class HashTableHost;
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typedef HashTableHost<const Symbol*, traceid, Entry, JfrSymbolId> SymbolTable;
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typedef HashTableHost<const char*, traceid, Entry, JfrSymbolId> CStringTable;
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public:
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typedef SymbolTable::HashEntry SymbolEntry;
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typedef CStringTable::HashEntry CStringEntry;
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private:
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SymbolTable* _sym_table;
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CStringTable* _cstring_table;
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traceid _symbol_id_counter;
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// hashtable(s) callbacks
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void assign_id(SymbolEntry* entry);
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bool equals(const Symbol* query, uintptr_t hash, const SymbolEntry* entry);
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void assign_id(CStringEntry* entry);
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bool equals(const char* query, uintptr_t hash, const CStringEntry* entry);
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public:
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static bool is_anonymous_klass(const Klass* k);
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static const char* create_anonymous_klass_symbol(const InstanceKlass* ik, uintptr_t& hashcode);
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static uintptr_t anonymous_klass_name_hash_code(const InstanceKlass* ik);
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static uintptr_t regular_klass_name_hash_code(const Klass* k);
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JfrSymbolId();
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~JfrSymbolId();
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void initialize();
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void clear();
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traceid mark_anonymous_klass_name(const Klass* k);
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traceid mark(const Symbol* sym, uintptr_t hash);
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traceid mark(const Klass* k);
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traceid mark(const Symbol* symbol);
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traceid mark(const char* str, uintptr_t hash);
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const SymbolEntry* map_symbol(const Symbol* symbol) const;
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const SymbolEntry* map_symbol(uintptr_t hash) const;
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const CStringEntry* map_cstring(uintptr_t hash) const;
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template <typename T>
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void symbol(T& functor, const Klass* k) {
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if (is_anonymous_klass(k)) {
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return;
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}
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functor(map_symbol(regular_klass_name_hash_code(k)));
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}
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template <typename T>
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void symbol(T& functor, const Method* method) {
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assert(method != NULL, "invariant");
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functor(map_symbol((uintptr_t)method->name()->identity_hash()));
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functor(map_symbol((uintptr_t)method->signature()->identity_hash()));
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}
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template <typename T>
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void cstring(T& functor, const Klass* k) {
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if (!is_anonymous_klass(k)) {
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return;
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}
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functor(map_cstring(anonymous_klass_name_hash_code((const InstanceKlass*)k)));
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}
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template <typename T>
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void iterate_symbols(T& functor) {
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_sym_table->iterate_entry(functor);
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}
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template <typename T>
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void iterate_cstrings(T& functor) {
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_cstring_table->iterate_entry(functor);
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}
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bool has_entries() const { return has_symbol_entries() || has_cstring_entries(); }
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bool has_symbol_entries() const { return _sym_table->has_entries(); }
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bool has_cstring_entries() const { return _cstring_table->has_entries(); }
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};
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// external name (synthetic) for the primordial "boot" class loader instance
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const char* const boot_class_loader_name = "boot";
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/**
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* When processing a set of artifacts, there will be a need
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* to track transitive dependencies originating with each artifact.
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* These might or might not be explicitly "tagged" at that point.
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* With the introduction of "epochs" to allow for concurrent tagging,
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* we attempt to avoid "tagging" an artifact to indicate its use in a
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* previous epoch. This is mainly to reduce the risk for data races.
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* Instead, JfrArtifactSet is used to track transitive dependencies
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* during the write process itself.
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*
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* It can also provide opportunities for caching, as the ideal should
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* be to reduce the amount of iterations neccessary for locating artifacts
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* in the respective VM subsystems.
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*/
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class JfrArtifactSet : public JfrCHeapObj {
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private:
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JfrSymbolId* _symbol_id;
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GrowableArray<const Klass*>* _klass_list;
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bool _class_unload;
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public:
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JfrArtifactSet(bool class_unload);
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~JfrArtifactSet();
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// caller needs ResourceMark
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void initialize(bool class_unload);
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void clear();
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traceid mark(const Symbol* sym, uintptr_t hash);
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traceid mark(const Klass* klass);
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traceid mark(const Symbol* symbol);
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traceid mark(const char* const str, uintptr_t hash);
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traceid mark_anonymous_klass_name(const Klass* klass);
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const JfrSymbolId::SymbolEntry* map_symbol(const Symbol* symbol) const;
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const JfrSymbolId::SymbolEntry* map_symbol(uintptr_t hash) const;
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const JfrSymbolId::CStringEntry* map_cstring(uintptr_t hash) const;
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bool has_klass_entries() const;
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int entries() const;
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void register_klass(const Klass* k);
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template <typename Functor>
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void iterate_klasses(Functor& functor) const {
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for (int i = 0; i < _klass_list->length(); ++i) {
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if (!functor(_klass_list->at(i))) {
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break;
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}
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}
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}
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template <typename T>
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void iterate_symbols(T& functor) {
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_symbol_id->iterate_symbols(functor);
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}
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template <typename T>
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void iterate_cstrings(T& functor) {
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_symbol_id->iterate_cstrings(functor);
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}
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};
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class KlassArtifactRegistrator {
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private:
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JfrArtifactSet* _artifacts;
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public:
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KlassArtifactRegistrator(JfrArtifactSet* artifacts) :
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_artifacts(artifacts) {
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assert(_artifacts != NULL, "invariant");
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}
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bool operator()(const Klass* klass) {
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assert(klass != NULL, "invariant");
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_artifacts->register_klass(klass);
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return true;
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}
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};
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#endif // SHARE_VM_JFR_RECORDER_CHECKPOINT_TYPES_JFRTYPESETUTILS_HPP
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