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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 "jfr/jfrEvents.hpp"
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#include "jfr/recorder/jfrRecorder.hpp"
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#include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp"
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#include "jfr/recorder/checkpoint/types/traceid/jfrTraceId.inline.hpp"
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#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"
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#include "jfr/leakprofiler/chains/edgeStore.hpp"
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#include "jfr/leakprofiler/chains/objectSampleMarker.hpp"
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#include "jfr/leakprofiler/checkpoint/objectSampleCheckpoint.hpp"
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#include "jfr/leakprofiler/checkpoint/objectSampleWriter.hpp"
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#include "jfr/leakprofiler/leakProfiler.hpp"
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#include "jfr/leakprofiler/sampling/objectSample.hpp"
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#include "jfr/leakprofiler/sampling/objectSampler.hpp"
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#include "jfr/leakprofiler/utilities/rootType.hpp"
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#include "jfr/metadata/jfrSerializer.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/thread.inline.hpp"
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template <typename SampleProcessor>
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static void do_samples(ObjectSample* sample, const ObjectSample* const end, SampleProcessor& processor) {
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assert(sample != NULL, "invariant");
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while (sample != end) {
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processor.sample_do(sample);
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sample = sample->next();
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}
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}
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class RootSystemType : public JfrSerializer {
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public:
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void serialize(JfrCheckpointWriter& writer) {
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const u4 nof_root_systems = OldObjectRoot::_number_of_systems;
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writer.write_count(nof_root_systems);
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for (u4 i = 0; i < nof_root_systems; ++i) {
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writer.write_key(i);
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writer.write(OldObjectRoot::system_description((OldObjectRoot::System)i));
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}
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}
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};
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class RootType : public JfrSerializer {
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public:
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void serialize(JfrCheckpointWriter& writer) {
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const u4 nof_root_types = OldObjectRoot::_number_of_types;
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writer.write_count(nof_root_types);
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for (u4 i = 0; i < nof_root_types; ++i) {
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writer.write_key(i);
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writer.write(OldObjectRoot::type_description((OldObjectRoot::Type)i));
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}
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}
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};
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class CheckpointInstall {
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private:
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const JfrCheckpointBlobHandle& _cp;
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public:
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CheckpointInstall(const JfrCheckpointBlobHandle& cp) : _cp(cp) {}
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void sample_do(ObjectSample* sample) {
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assert(sample != NULL, "invariant");
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if (!sample->is_dead()) {
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sample->set_klass_checkpoint(_cp);
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}
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}
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};
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class CheckpointWrite {
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private:
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JfrCheckpointWriter& _writer;
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const jlong _last_sweep;
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public:
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CheckpointWrite(JfrCheckpointWriter& writer, jlong last_sweep) : _writer(writer), _last_sweep(last_sweep) {}
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void sample_do(ObjectSample* sample) {
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assert(sample != NULL, "invariant");
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if (sample->is_alive_and_older_than(_last_sweep)) {
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if (sample->has_thread_checkpoint()) {
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const JfrCheckpointBlobHandle& thread_cp = sample->thread_checkpoint();
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thread_cp->exclusive_write(_writer);
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}
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if (sample->has_klass_checkpoint()) {
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const JfrCheckpointBlobHandle& klass_cp = sample->klass_checkpoint();
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klass_cp->exclusive_write(_writer);
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}
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}
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}
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};
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class CheckpointStateReset {
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private:
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const jlong _last_sweep;
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public:
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CheckpointStateReset(jlong last_sweep) : _last_sweep(last_sweep) {}
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void sample_do(ObjectSample* sample) {
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assert(sample != NULL, "invariant");
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if (sample->is_alive_and_older_than(_last_sweep)) {
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if (sample->has_thread_checkpoint()) {
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const JfrCheckpointBlobHandle& thread_cp = sample->thread_checkpoint();
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thread_cp->reset_write_state();
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}
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if (sample->has_klass_checkpoint()) {
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const JfrCheckpointBlobHandle& klass_cp = sample->klass_checkpoint();
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klass_cp->reset_write_state();
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}
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}
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}
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};
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class StackTraceWrite {
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private:
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JfrStackTraceRepository& _stack_trace_repo;
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JfrCheckpointWriter& _writer;
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int _count;
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public:
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StackTraceWrite(JfrStackTraceRepository& stack_trace_repo, JfrCheckpointWriter& writer) :
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_stack_trace_repo(stack_trace_repo), _writer(writer), _count(0) {
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JfrStacktrace_lock->lock();
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}
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~StackTraceWrite() {
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assert(JfrStacktrace_lock->owned_by_self(), "invariant");
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JfrStacktrace_lock->unlock();
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}
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void sample_do(ObjectSample* sample) {
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assert(sample != NULL, "invariant");
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if (!sample->is_dead()) {
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if (sample->has_stack_trace()) {
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JfrTraceId::use(sample->klass(), true);
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_stack_trace_repo.write(_writer, sample->stack_trace_id(), sample->stack_trace_hash());
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++_count;
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}
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}
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}
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int count() const {
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return _count;
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}
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};
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class SampleMark {
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private:
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ObjectSampleMarker& _marker;
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jlong _last_sweep;
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int _count;
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public:
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SampleMark(ObjectSampleMarker& marker, jlong last_sweep) : _marker(marker),
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_last_sweep(last_sweep),
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_count(0) {}
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void sample_do(ObjectSample* sample) {
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assert(sample != NULL, "invariant");
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if (sample->is_alive_and_older_than(_last_sweep)) {
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_marker.mark(sample->object());
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++_count;
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}
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}
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int count() const {
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return _count;
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}
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};
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void ObjectSampleCheckpoint::install(JfrCheckpointWriter& writer, bool class_unload, bool resume) {
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assert(class_unload ? SafepointSynchronize::is_at_safepoint() : LeakProfiler::is_suspended(), "invariant");
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if (!writer.has_data()) {
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if (!class_unload) {
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LeakProfiler::resume();
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}
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assert(LeakProfiler::is_running(), "invariant");
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return;
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}
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assert(writer.has_data(), "invariant");
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const JfrCheckpointBlobHandle h_cp = writer.checkpoint_blob();
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const ObjectSampler* const object_sampler = LeakProfiler::object_sampler();
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assert(object_sampler != NULL, "invariant");
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ObjectSample* const last = const_cast<ObjectSample*>(object_sampler->last());
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const ObjectSample* const last_resolved = object_sampler->last_resolved();
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CheckpointInstall install(h_cp);
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if (class_unload) {
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if (last != NULL) {
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// all samples need the class unload information
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do_samples(last, NULL, install);
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}
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assert(LeakProfiler::is_running(), "invariant");
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return;
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}
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// only new samples since last resolved checkpoint
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if (last != last_resolved) {
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do_samples(last, last_resolved, install);
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if (resume) {
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const_cast<ObjectSampler*>(object_sampler)->set_last_resolved(last);
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}
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}
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assert(LeakProfiler::is_suspended(), "invariant");
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if (resume) {
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LeakProfiler::resume();
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assert(LeakProfiler::is_running(), "invariant");
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}
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}
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void ObjectSampleCheckpoint::write(const EdgeStore* edge_store, bool emit_all, Thread* thread) {
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assert(edge_store != NULL, "invariant");
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assert(thread != NULL, "invariant");
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static bool types_registered = false;
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if (!types_registered) {
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JfrSerializer::register_serializer(TYPE_OLDOBJECTROOTSYSTEM, false, true, new RootSystemType());
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JfrSerializer::register_serializer(TYPE_OLDOBJECTROOTTYPE, false, true, new RootType());
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types_registered = true;
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}
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const ObjectSampler* const object_sampler = LeakProfiler::object_sampler();
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assert(object_sampler != NULL, "invariant");
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const jlong last_sweep = emit_all ? max_jlong : object_sampler->last_sweep().value();
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ObjectSample* const last = const_cast<ObjectSample*>(object_sampler->last());
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{
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JfrCheckpointWriter writer(false, false, thread);
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CheckpointWrite checkpoint_write(writer, last_sweep);
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do_samples(last, NULL, checkpoint_write);
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}
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CheckpointStateReset state_reset(last_sweep);
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do_samples(last, NULL, state_reset);
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if (!edge_store->is_empty()) {
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// java object and chain representations
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JfrCheckpointWriter writer(false, true, thread);
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ObjectSampleWriter osw(writer, edge_store);
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edge_store->iterate_edges(osw);
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}
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}
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WriteObjectSampleStacktrace::WriteObjectSampleStacktrace(JfrStackTraceRepository& repo) :
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_stack_trace_repo(repo) {
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}
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bool WriteObjectSampleStacktrace::process() {
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assert(SafepointSynchronize::is_at_safepoint(), "invariant");
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if (!LeakProfiler::is_running()) {
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return true;
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}
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// Suspend the LeakProfiler subsystem
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// to ensure stable samples even
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// after we return from the safepoint.
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LeakProfiler::suspend();
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assert(!LeakProfiler::is_running(), "invariant");
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assert(LeakProfiler::is_suspended(), "invariant");
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const ObjectSampler* object_sampler = LeakProfiler::object_sampler();
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assert(object_sampler != NULL, "invariant");
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assert(LeakProfiler::is_suspended(), "invariant");
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ObjectSample* const last = const_cast<ObjectSample*>(object_sampler->last());
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const ObjectSample* const last_resolved = object_sampler->last_resolved();
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if (last == last_resolved) {
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assert(LeakProfiler::is_suspended(), "invariant");
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return true;
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}
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JfrCheckpointWriter writer(false, true, Thread::current());
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const JfrCheckpointContext ctx = writer.context();
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writer.write_type(TYPE_STACKTRACE);
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const jlong count_offset = writer.reserve(sizeof(u4));
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int count = 0;
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{
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StackTraceWrite stack_trace_write(_stack_trace_repo, writer); // JfrStacktrace_lock
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do_samples(last, last_resolved, stack_trace_write);
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count = stack_trace_write.count();
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}
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if (count == 0) {
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writer.set_context(ctx);
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assert(LeakProfiler::is_suspended(), "invariant");
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return true;
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}
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assert(count > 0, "invariant");
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writer.write_count((u4)count, count_offset);
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JfrStackTraceRepository::write_metadata(writer);
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ObjectSampleCheckpoint::install(writer, false, false);
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assert(LeakProfiler::is_suspended(), "invariant");
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return true;
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}
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int ObjectSampleCheckpoint::mark(ObjectSampleMarker& marker, bool emit_all) {
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const ObjectSampler* object_sampler = LeakProfiler::object_sampler();
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assert(object_sampler != NULL, "invariant");
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ObjectSample* const last = const_cast<ObjectSample*>(object_sampler->last());
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if (last == NULL) {
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return 0;
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}
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const jlong last_sweep = emit_all ? max_jlong : object_sampler->last_sweep().value();
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SampleMark mark(marker, last_sweep);
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do_samples(last, NULL, mark);
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return mark.count();
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}
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