--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/gc_implementation/shared/immutableSpace.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2001-2006 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.
+ *
+ */
+
+// An ImmutableSpace is a viewport into a contiguous range
+// (or subrange) of previously allocated objects.
+
+// Invariant: bottom() and end() are on page_size boundaries and
+// bottom() <= end()
+
+class ImmutableSpace: public CHeapObj {
+  friend class VMStructs;
+ protected:
+  HeapWord* _bottom;
+  HeapWord* _end;
+
+ public:
+  ImmutableSpace()                   { _bottom = NULL; _end = NULL;  }
+  HeapWord* bottom() const           { return _bottom;               }
+  HeapWord* end() const              { return _end;                  }
+
+  MemRegion region() const { return MemRegion(bottom(), end()); }
+
+  // Initialization
+  void initialize(MemRegion mr);
+
+  bool contains(const void* p) const { return _bottom <= p && p < _end; }
+
+  // Size computations.  Sizes are in bytes.
+  size_t capacity_in_bytes() const            { return capacity_in_words() * HeapWordSize; }
+
+  // Size computations.  Sizes are in heapwords.
+  size_t capacity_in_words() const            { return pointer_delta(end(), bottom()); }
+
+  // Iteration.
+  virtual void oop_iterate(OopClosure* cl);
+  virtual void object_iterate(ObjectClosure* cl);
+
+  // Debugging
+  virtual void print() const            PRODUCT_RETURN;
+  virtual void print_short() const      PRODUCT_RETURN;
+  virtual void verify(bool allow_dirty) const;
+};