--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/jfr/leakprofiler/utilities/saveRestore.hpp	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2017, 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.
+ *
+ */
+
+#ifndef SHARE_VM_JFR_LEAKPROFILER_UTILITIES_SAVERESTORE_HPP
+#define SHARE_VM_JFR_LEAKPROFILER_UTILITIES_SAVERESTORE_HPP
+
+#include "memory/allocation.hpp"
+#include "memory/iterator.hpp"
+#include "oops/markOop.hpp"
+#include "utilities/growableArray.hpp"
+
+template <typename T, typename Impl>
+class SaveRestore {
+ private:
+  Impl _impl;
+ public:
+  SaveRestore() : _impl() {
+    _impl.setup();
+  }
+
+  void save(T const& value) {
+    _impl.save(value);
+  }
+
+  ~SaveRestore() {
+    _impl.restore();
+  }
+};
+
+template <typename T, typename Context>
+class ContextStore {
+private:
+  GrowableArray<Context>* _storage;
+public:
+  ContextStore() : _storage(NULL) {}
+
+  void setup() {
+    assert(_storage == NULL, "invariant");
+    _storage = new GrowableArray<Context>(16);
+  }
+
+  void save(T const& value) {
+    _storage->push(Context(value));
+  }
+
+  void restore() {
+    for (int i = 0; i < _storage->length(); ++i) {
+      _storage->at(i).~Context();
+    }
+  }
+};
+
+/*
+* This class will save the original mark oop of an object sample object.
+* It will then install an "identifier" mark oop to be used for
+* identification purposes in the search for reference chains.
+* The destructor will restore the original mark oop.
+*/
+
+class MarkOopContext {
+ private:
+  oop _obj;
+  markOop _mark_oop;
+  void swap(MarkOopContext& rhs);
+ public:
+  MarkOopContext();
+  MarkOopContext(const oop obj);
+  MarkOopContext(const MarkOopContext& rhs);
+  void operator=(MarkOopContext rhs);
+  ~MarkOopContext();
+};
+
+typedef SaveRestore<oop, ContextStore<oop, MarkOopContext> > SaveRestoreMarkOops;
+
+class ClassLoaderData;
+
+class CLDClaimContext {
+ private:
+  ClassLoaderData* _cld;
+  void swap(CLDClaimContext& rhs);
+ public:
+  CLDClaimContext();
+  CLDClaimContext(ClassLoaderData* cld);
+  CLDClaimContext(const CLDClaimContext& rhs);
+  void operator=(CLDClaimContext rhs);
+  ~CLDClaimContext();
+};
+
+typedef SaveRestore<ClassLoaderData*, ContextStore<ClassLoaderData*, CLDClaimContext> > SaveRestoreCLDClaimState;
+
+class CLDClaimStateClosure : public CLDClosure {
+ private:
+  SaveRestoreCLDClaimState _state;
+ public:
+  CLDClaimStateClosure();
+  void do_cld(ClassLoaderData* cld);
+};
+
+class SaveRestoreCLDClaimBits : public StackObj {
+ private:
+  CLDClaimStateClosure _claim_state_closure;
+ public:
+  SaveRestoreCLDClaimBits();
+  ~SaveRestoreCLDClaimBits();
+};
+
+#endif // SHARE_VM_JFR_LEAKPROFILER_UTILITIES_SAVERESTORE_HPP