--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/jfr/leakprofiler/leakProfiler.cpp	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "jfr/leakprofiler/emitEventOperation.hpp"
+#include "jfr/leakprofiler/leakProfiler.hpp"
+#include "jfr/leakprofiler/startOperation.hpp"
+#include "jfr/leakprofiler/stopOperation.hpp"
+#include "jfr/leakprofiler/sampling/objectSampler.hpp"
+#include "jfr/recorder/service/jfrOptionSet.hpp"
+#include "memory/iterator.hpp"
+#include "oops/oop.hpp"
+#include "runtime/atomic.hpp"
+#include "runtime/orderAccess.inline.hpp"
+#include "runtime/thread.hpp"
+#include "runtime/vmThread.hpp"
+#include "utilities/ostream.hpp"
+
+// Only to be updated during safepoint
+ObjectSampler* LeakProfiler::_object_sampler = NULL;
+
+static volatile jbyte suspended = 0;
+bool LeakProfiler::start(jint sample_count) {
+  if (_object_sampler != NULL) {
+    // already started
+    return true;
+  }
+  // Allows user to disable leak profiler on command line by setting queue size to zero.
+  if (sample_count > 0) {
+    StartOperation op(sample_count);
+    VMThread::execute(&op);
+    return _object_sampler != NULL;
+  }
+  return false;
+}
+
+bool LeakProfiler::stop() {
+  if (_object_sampler == NULL) {
+    // already stopped/not started
+    return true;
+  }
+  StopOperation op;
+  VMThread::execute(&op);
+  return _object_sampler == NULL;
+}
+
+void LeakProfiler::emit_events(jlong cutoff_ticks, bool emit_all) {
+  if (!is_running()) {
+    return;
+  }
+  EmitEventOperation op(cutoff_ticks, emit_all);
+  VMThread::execute(&op);
+}
+
+void LeakProfiler::oops_do(BoolObjectClosure* is_alive, OopClosure* f) {
+  assert(SafepointSynchronize::is_at_safepoint(),
+    "Leak Profiler::oops_do(...) may only be called during safepoint");
+
+  if (_object_sampler != NULL) {
+    _object_sampler->oops_do(is_alive, f);
+  }
+}
+
+void LeakProfiler::sample(HeapWord* object,
+                          size_t size,
+                          JavaThread* thread) {
+  assert(is_running(), "invariant");
+  assert(thread != NULL, "invariant");
+  assert(thread->thread_state() == _thread_in_vm, "invariant");
+
+  // exclude compiler threads and code sweeper thread
+  if (thread->is_hidden_from_external_view()) {
+    return;
+  }
+
+  _object_sampler->add(object, size, thread);
+}
+
+ObjectSampler* LeakProfiler::object_sampler() {
+  assert(is_suspended() || SafepointSynchronize::is_at_safepoint(),
+    "Leak Profiler::object_sampler() may only be called during safepoint");
+  return _object_sampler;
+}
+
+void LeakProfiler::set_object_sampler(ObjectSampler* object_sampler) {
+  assert(SafepointSynchronize::is_at_safepoint(),
+    "Leak Profiler::set_object_sampler() may only be called during safepoint");
+  _object_sampler = object_sampler;
+}
+
+bool LeakProfiler::is_running() {
+  return _object_sampler != NULL && !suspended;
+}
+
+bool LeakProfiler::is_suspended() {
+  return _object_sampler != NULL && suspended;
+}
+
+void LeakProfiler::resume() {
+  assert(is_suspended(), "invariant");
+  OrderAccess::storestore();
+  Atomic::store((jbyte)0, &suspended);
+  assert(is_running(), "invariant");
+}
+
+void LeakProfiler::suspend() {
+  assert(SafepointSynchronize::is_at_safepoint(), "invariant");
+  assert(_object_sampler != NULL, "invariant");
+  assert(!is_suspended(), "invariant");
+  suspended = (jbyte)1; // safepoint visible
+}