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/*
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* Copyright (c) 2014, 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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#include "precompiled.hpp"
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#include "aot/aotLoader.hpp"
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#include "classfile/stringTable.hpp"
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#include "gc/shared/strongRootsScope.hpp"
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#include "jfr/leakprofiler/utilities/unifiedOop.hpp"
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#include "jfr/leakprofiler/checkpoint/rootResolver.hpp"
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#include "memory/iterator.hpp"
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#include "oops/klass.hpp"
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#include "oops/markOop.hpp"
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#include "oops/oop.hpp"
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#include "prims/jvmtiThreadState.hpp"
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#include "prims/privilegedStack.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/threadSMR.inline.hpp"
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#include "runtime/vframe_hp.hpp"
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#include "services/management.hpp"
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#include "utilities/growableArray.hpp"
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class ReferenceLocateClosure : public OopClosure {
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protected:
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RootCallback& _callback;
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RootCallbackInfo _info;
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bool _complete;
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void do_oop_shared(const void* ref);
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public:
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ReferenceLocateClosure(RootCallback& callback,
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OldObjectRoot::System system,
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OldObjectRoot::Type type,
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const void* context) : _callback(callback),
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_info(),
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_complete(false) {
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_info._high = NULL;
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_info._low = NULL;
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_info._system = system;
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_info._type = type;
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_info._context = context;
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}
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virtual void do_oop(oop* ref);
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virtual void do_oop(narrowOop* ref);
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bool complete() const {
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return _complete;
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}
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};
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void ReferenceLocateClosure::do_oop_shared(const void* ref) {
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assert(ref != NULL, "invariant");
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if (!_complete) {
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_info._high = ref;
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_complete = _callback.process(_info);
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}
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}
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void ReferenceLocateClosure::do_oop(oop* ref) {
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do_oop_shared(ref);
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}
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void ReferenceLocateClosure::do_oop(narrowOop* ref) {
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do_oop_shared(ref);
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}
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class ReferenceToRootClosure : public StackObj {
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private:
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RootCallback& _callback;
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RootCallbackInfo _info;
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bool _complete;
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bool do_cldg_roots();
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bool do_object_synchronizer_roots();
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bool do_universe_roots();
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bool do_jni_handle_roots();
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bool do_jvmti_roots();
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bool do_system_dictionary_roots();
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bool do_management_roots();
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bool do_string_table_roots();
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bool do_aot_loader_roots();
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bool do_roots();
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public:
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ReferenceToRootClosure(RootCallback& callback) : _callback(callback),
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_info(),
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_complete(false) {
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_info._high = NULL;
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_info._low = NULL;
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_info._context = NULL;
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_info._system = OldObjectRoot::_system_undetermined;
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_info._type = OldObjectRoot::_type_undetermined;
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assert_locked_or_safepoint(Threads_lock);
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do_roots();
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}
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bool complete() const {
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return _complete;
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}
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};
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bool ReferenceToRootClosure::do_cldg_roots() {
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assert(!complete(), "invariant");
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ReferenceLocateClosure rlc(_callback, OldObjectRoot::_class_loader_data, OldObjectRoot::_type_undetermined, NULL);
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CLDToOopClosure cldt_closure(&rlc);
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ClassLoaderDataGraph::always_strong_cld_do(&cldt_closure);
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return rlc.complete();
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}
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bool ReferenceToRootClosure::do_object_synchronizer_roots() {
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assert(!complete(), "invariant");
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ReferenceLocateClosure rlc(_callback, OldObjectRoot::_object_synchronizer, OldObjectRoot::_type_undetermined, NULL);
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ObjectSynchronizer::oops_do(&rlc);
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return rlc.complete();
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}
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bool ReferenceToRootClosure::do_universe_roots() {
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assert(!complete(), "invariant");
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ReferenceLocateClosure rlc(_callback, OldObjectRoot::_universe, OldObjectRoot::_type_undetermined, NULL);
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Universe::oops_do(&rlc);
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return rlc.complete();
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}
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bool ReferenceToRootClosure::do_jni_handle_roots() {
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assert(!complete(), "invariant");
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ReferenceLocateClosure rlc(_callback, OldObjectRoot::_global_jni_handles, OldObjectRoot::_global_jni_handle, NULL);
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JNIHandles::oops_do(&rlc);
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return rlc.complete();
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}
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bool ReferenceToRootClosure::do_jvmti_roots() {
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assert(!complete(), "invariant");
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ReferenceLocateClosure rlc(_callback, OldObjectRoot::_jvmti, OldObjectRoot::_global_jni_handle, NULL);
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JvmtiExport::oops_do(&rlc);
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return rlc.complete();
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}
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bool ReferenceToRootClosure::do_system_dictionary_roots() {
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assert(!complete(), "invariant");
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ReferenceLocateClosure rlc(_callback, OldObjectRoot::_system_dictionary, OldObjectRoot::_type_undetermined, NULL);
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SystemDictionary::oops_do(&rlc);
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return rlc.complete();
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}
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bool ReferenceToRootClosure::do_management_roots() {
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assert(!complete(), "invariant");
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ReferenceLocateClosure rlc(_callback, OldObjectRoot::_management, OldObjectRoot::_type_undetermined, NULL);
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Management::oops_do(&rlc);
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return rlc.complete();
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}
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bool ReferenceToRootClosure::do_string_table_roots() {
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assert(!complete(), "invariant");
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ReferenceLocateClosure rlc(_callback, OldObjectRoot::_string_table, OldObjectRoot::_type_undetermined, NULL);
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StringTable::oops_do(&rlc);
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return rlc.complete();
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}
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bool ReferenceToRootClosure::do_aot_loader_roots() {
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assert(!complete(), "invariant");
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ReferenceLocateClosure rcl(_callback, OldObjectRoot::_aot, OldObjectRoot::_type_undetermined, NULL);
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AOTLoader::oops_do(&rcl);
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return rcl.complete();
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}
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bool ReferenceToRootClosure::do_roots() {
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assert(!complete(), "invariant");
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assert(OldObjectRoot::_system_undetermined == _info._system, "invariant");
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assert(OldObjectRoot::_type_undetermined == _info._type, "invariant");
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if (do_cldg_roots()) {
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_complete = true;
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return true;
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}
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if (do_object_synchronizer_roots()) {
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_complete = true;
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return true;
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}
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if (do_universe_roots()) {
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_complete = true;
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return true;
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}
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if (do_jni_handle_roots()) {
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_complete = true;
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return true;
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}
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if (do_jvmti_roots()) {
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_complete = true;
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return true;
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}
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if (do_system_dictionary_roots()) {
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_complete = true;
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return true;
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}
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if (do_management_roots()) {
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_complete = true;
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return true;
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}
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if (do_string_table_roots()) {
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_complete = true;
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return true;
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}
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if (do_aot_loader_roots()) {
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_complete = true;
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return true;
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}
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return false;
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}
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class ReferenceToThreadRootClosure : public StackObj {
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private:
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RootCallback& _callback;
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bool _complete;
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bool do_java_threads_oops(JavaThread* jt);
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bool do_thread_roots(JavaThread* jt);
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bool do_thread_stack_fast(JavaThread* jt);
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bool do_thread_stack_detailed(JavaThread* jt);
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bool do_thread_jni_handles(JavaThread* jt);
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bool do_thread_handle_area(JavaThread* jt);
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public:
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ReferenceToThreadRootClosure(RootCallback& callback) :_callback(callback), _complete(false) {
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assert_locked_or_safepoint(Threads_lock);
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for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) {
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if (do_thread_roots(jt)) {
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return;
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}
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}
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}
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bool complete() const {
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return _complete;
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}
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};
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bool ReferenceToThreadRootClosure::do_thread_handle_area(JavaThread* jt) {
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assert(jt != NULL, "invariant");
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assert(!complete(), "invariant");
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ReferenceLocateClosure rcl(_callback, OldObjectRoot::_threads, OldObjectRoot::_handle_area, jt);
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jt->handle_area()->oops_do(&rcl);
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return rcl.complete();
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}
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bool ReferenceToThreadRootClosure::do_thread_jni_handles(JavaThread* jt) {
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assert(jt != NULL, "invariant");
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assert(!complete(), "invariant");
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ReferenceLocateClosure rcl(_callback, OldObjectRoot::_threads, OldObjectRoot::_local_jni_handle, jt);
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jt->active_handles()->oops_do(&rcl);
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return rcl.complete();
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}
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bool ReferenceToThreadRootClosure::do_thread_stack_fast(JavaThread* jt) {
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assert(jt != NULL, "invariant");
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assert(!complete(), "invariant");
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if (_callback.entries() == 0) {
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_complete = true;
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return true;
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}
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RootCallbackInfo info;
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info._high = NULL;
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info._low = NULL;
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info._context = jt;
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info._system = OldObjectRoot::_threads;
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info._type = OldObjectRoot::_stack_variable;
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for (int i = 0; i < _callback.entries(); ++i) {
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const address adr = (address)_callback.at(i);
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if (jt->is_in_usable_stack(adr)) {
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info._high = adr;
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_complete = _callback.process(info);
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if (_complete) {
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return true;
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}
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}
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}
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assert(!complete(), "invariant");
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return false;
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}
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bool ReferenceToThreadRootClosure::do_thread_stack_detailed(JavaThread* jt) {
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assert(jt != NULL, "invariant");
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assert(!complete(), "invariant");
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ReferenceLocateClosure rcl(_callback, OldObjectRoot::_threads, OldObjectRoot::_stack_variable, jt);
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if (jt->has_last_Java_frame()) {
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PrivilegedElement* const pelem = jt->privileged_stack_top();
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if (pelem != NULL) {
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pelem->oops_do(&rcl);
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if (rcl.complete()) {
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return true;
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}
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}
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// traverse the registered growable array gc_array
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// can't do this as it is not reachable from outside
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// Traverse the monitor chunks
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MonitorChunk* chunk = jt->monitor_chunks();
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for (; chunk != NULL; chunk = chunk->next()) {
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chunk->oops_do(&rcl);
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}
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if (rcl.complete()) {
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return true;
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}
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// Traverse the execution stack
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for (StackFrameStream fst(jt); !fst.is_done(); fst.next()) {
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fst.current()->oops_do(&rcl, NULL, fst.register_map());
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}
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} // last java frame
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if (rcl.complete()) {
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return true;
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}
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GrowableArray<jvmtiDeferredLocalVariableSet*>* const list = jt->deferred_locals();
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if (list != NULL) {
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for (int i = 0; i < list->length(); i++) {
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list->at(i)->oops_do(&rcl);
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}
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}
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if (rcl.complete()) {
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return true;
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}
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// Traverse instance variables at the end since the GC may be moving things
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// around using this function
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/*
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* // can't reach these oop* from the outside
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f->do_oop((oop*) &_threadObj);
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f->do_oop((oop*) &_vm_result);
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f->do_oop((oop*) &_exception_oop);
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f->do_oop((oop*) &_pending_async_exception);
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*/
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JvmtiThreadState* const jvmti_thread_state = jt->jvmti_thread_state();
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if (jvmti_thread_state != NULL) {
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jvmti_thread_state->oops_do(&rcl);
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}
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return rcl.complete();
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}
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bool ReferenceToThreadRootClosure::do_java_threads_oops(JavaThread* jt) {
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assert(jt != NULL, "invariant");
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assert(!complete(), "invariant");
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ReferenceLocateClosure rcl(_callback, OldObjectRoot::_threads, OldObjectRoot::_global_jni_handle, jt);
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jt->oops_do(&rcl, NULL);
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return rcl.complete();
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}
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bool ReferenceToThreadRootClosure::do_thread_roots(JavaThread* jt) {
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assert(jt != NULL, "invariant");
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if (do_thread_stack_fast(jt)) {
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_complete = true;
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return true;
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}
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if (do_thread_jni_handles(jt)) {
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_complete = true;
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return true;
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}
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if (do_thread_handle_area(jt)) {
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_complete = true;
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return true;
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}
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if (do_thread_stack_detailed(jt)) {
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_complete = true;
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return true;
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}
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return false;
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}
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class RootResolverMarkScope : public MarkScope {
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};
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void RootResolver::resolve(RootCallback& callback) {
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426 |
// Need to clear cld claim bit before starting
|
|
427 |
ClassLoaderDataGraph::clear_claimed_marks();
|
|
428 |
RootResolverMarkScope mark_scope;
|
|
429 |
|
|
430 |
// thread local roots
|
|
431 |
ReferenceToThreadRootClosure rtrc(callback);
|
|
432 |
if (rtrc.complete()) {
|
|
433 |
return;
|
|
434 |
}
|
|
435 |
// system global roots
|
|
436 |
ReferenceToRootClosure rrc(callback);
|
|
437 |
}
|