--- /dev/null	2013-06-05 10:57:52.000000000 +0200
+++ new/src/share/vm/gc_implementation/shared/gcHeapSummary.hpp	2013-06-05 10:57:52.000000000 +0200
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2012, 2013, 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_GC_IMPLEMENTATION_SHARED_GCHEAPSUMMARY_HPP
+#define SHARE_VM_GC_IMPLEMENTATION_SHARED_GCHEAPSUMMARY_HPP
+
+#include "memory/allocation.hpp"
+
+class VirtualSpaceSummary : public StackObj {
+  HeapWord* _start;
+  HeapWord* _committed_end;
+  HeapWord* _reserved_end;
+public:
+  VirtualSpaceSummary() :
+      _start(NULL), _committed_end(NULL), _reserved_end(NULL) { }
+  VirtualSpaceSummary(HeapWord* start, HeapWord* committed_end, HeapWord* reserved_end) :
+      _start(start), _committed_end(committed_end), _reserved_end(reserved_end) { }
+
+  HeapWord* start() const { return _start; }
+  HeapWord* committed_end() const { return _committed_end; }
+  HeapWord* reserved_end() const { return _reserved_end; }
+  size_t committed_size() const { return (uintptr_t)_committed_end - (uintptr_t)_start;  }
+  size_t reserved_size() const { return (uintptr_t)_reserved_end - (uintptr_t)_start; }
+};
+
+class SpaceSummary : public StackObj {
+  HeapWord* _start;
+  HeapWord* _end;
+  size_t    _used;
+public:
+  SpaceSummary() :
+      _start(NULL), _end(NULL), _used(0) { }
+  SpaceSummary(HeapWord* start, HeapWord* end, size_t used) :
+      _start(start), _end(end), _used(used) { }
+
+  HeapWord* start() const { return _start; }
+  HeapWord* end() const { return _end; }
+  size_t used() const { return _used; }
+  size_t size() const { return (uintptr_t)_end - (uintptr_t)_start; }
+};
+
+class MetaspaceSizes : public StackObj {
+  size_t _capacity;
+  size_t _used;
+  size_t _reserved;
+
+ public:
+  MetaspaceSizes() : _capacity(0), _used(0), _reserved(0) {}
+  MetaspaceSizes(size_t capacity, size_t used, size_t reserved) :
+    _capacity(capacity), _used(used), _reserved(reserved) {}
+
+  size_t capacity() const { return _capacity; }
+  size_t used() const { return _used; }
+  size_t reserved() const { return _reserved; }
+};
+
+class GCHeapSummary;
+class PSHeapSummary;
+
+class GCHeapSummaryVisitor {
+ public:
+  virtual void visit(const GCHeapSummary* heap_summary) const = 0;
+  virtual void visit(const PSHeapSummary* heap_summary) const {}
+};
+
+class GCHeapSummary : public StackObj {
+  VirtualSpaceSummary _heap;
+  size_t _used;
+
+ public:
+   GCHeapSummary() :
+       _heap(), _used(0) { }
+   GCHeapSummary(VirtualSpaceSummary& heap_space, size_t used) :
+       _heap(heap_space), _used(used) { }
+
+  const VirtualSpaceSummary& heap() const { return _heap; }
+  size_t used() const { return _used; }
+
+   virtual void accept(GCHeapSummaryVisitor* visitor) const {
+     visitor->visit(this);
+   }
+};
+
+class PSHeapSummary : public GCHeapSummary {
+  VirtualSpaceSummary  _old;
+  SpaceSummary         _old_space;
+  VirtualSpaceSummary  _young;
+  SpaceSummary         _eden;
+  SpaceSummary         _from;
+  SpaceSummary         _to;
+ public:
+   PSHeapSummary(VirtualSpaceSummary& heap_space, size_t heap_used, VirtualSpaceSummary old, SpaceSummary old_space, VirtualSpaceSummary young, SpaceSummary eden, SpaceSummary from, SpaceSummary to) :
+       GCHeapSummary(heap_space, heap_used), _old(old), _old_space(old_space), _young(young), _eden(eden), _from(from), _to(to) { }
+   const VirtualSpaceSummary& old() const { return _old; }
+   const SpaceSummary& old_space() const { return _old_space; }
+   const VirtualSpaceSummary& young() const { return _young; }
+   const SpaceSummary& eden() const { return _eden; }
+   const SpaceSummary& from() const { return _from; }
+   const SpaceSummary& to() const { return _to; }
+
+   virtual void accept(GCHeapSummaryVisitor* visitor) const {
+     visitor->visit(this);
+   }
+};
+
+class MetaspaceSummary : public StackObj {
+  MetaspaceSizes _meta_space;
+  MetaspaceSizes _data_space;
+  MetaspaceSizes _class_space;
+
+ public:
+  MetaspaceSummary() : _meta_space(), _data_space(), _class_space() {}
+  MetaspaceSummary(const MetaspaceSizes& meta_space, const MetaspaceSizes& data_space, const MetaspaceSizes& class_space) :
+       _meta_space(meta_space), _data_space(data_space), _class_space(class_space) { }
+
+  const MetaspaceSizes& meta_space() const { return _meta_space; }
+  const MetaspaceSizes& data_space() const { return _data_space; }
+  const MetaspaceSizes& class_space() const { return _class_space; }
+};
+
+#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_GCHEAPSUMMARY_HPP