--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/memory/watermark.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2000-2001 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// A water mark points into a space and is used during GC to keep track of
+// progress.
+
+class Space;
+
+class WaterMark VALUE_OBJ_CLASS_SPEC {
+  friend class VMStructs;
+ private:
+  HeapWord* _point;
+  Space*    _space;
+ public:
+  // Accessors
+  Space* space() const        { return _space;  }
+  void set_space(Space* s)    { _space = s;     }
+  HeapWord* point() const     { return _point;  }
+  void set_point(HeapWord* p) { _point = p;     }
+
+  // Constructors
+  WaterMark(Space* s, HeapWord* p) : _space(s), _point(p) {};
+  WaterMark() : _space(NULL), _point(NULL) {};
+};
+
+inline bool operator==(const WaterMark& x, const WaterMark& y) {
+  return (x.point() == y.point()) && (x.space() == y.space());
+}
+
+inline bool operator!=(const WaterMark& x, const WaterMark& y) {
+  return !(x == y);
+}