--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/ci/ciBaseObject.hpp	Sat Sep 01 13:25:18 2012 -0400
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2011, 2012, 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_CI_CIBASEOBJECT_HPP
+#define SHARE_VM_CI_CIBASEOBJECT_HPP
+
+#include "ci/ciClassList.hpp"
+#include "memory/allocation.hpp"
+#include "runtime/handles.hpp"
+#include "runtime/jniHandles.hpp"
+
+// ciBaseObject
+//
+// This class represents an oop in the HotSpot virtual machine.
+// Its subclasses are structured in a hierarchy which mirrors
+// an aggregate of the VM's oop and klass hierarchies (see
+// oopHierarchy.hpp).  Each instance of ciBaseObject holds a handle
+// to a corresponding oop on the VM side and provides routines
+// for accessing the information in its oop.  By using the ciBaseObject
+// hierarchy for accessing oops in the VM, the compiler ensures
+// that it is safe with respect to garbage collection; that is,
+// GC and compilation can proceed independently without
+// interference.
+//
+// Within the VM, the oop and klass hierarchies are separate.
+// The compiler interface does not preserve this separation --
+// the distinction between `Klass*' and `Klass' are not
+// reflected in the interface and instead the Klass hierarchy
+// is directly modeled as the subclasses of ciKlass.
+class ciBaseObject : public ResourceObj {
+  CI_PACKAGE_ACCESS
+  friend class ciEnv;
+
+protected:
+  uint     _ident;
+
+  enum { FLAG_BITS   = 1 };
+  enum {
+         SCAVENGABLE_FLAG = 1
+       };
+protected:
+  ciBaseObject(): _ident(0) {}
+
+  virtual const char* type_string() { return "ciBaseObject"; }
+
+  void set_ident(uint id);
+
+public:
+  // A number unique to this object.
+  uint ident();
+
+  // What kind of ciBaseObject is this?
+  virtual bool is_symbol() const       { return false; }
+  virtual bool is_object() const       { return false; }
+  virtual bool is_metadata() const     { return false; }
+
+  ciSymbol* as_symbol() {
+    assert(is_symbol(), "must be");
+    return (ciSymbol*)this;
+  }
+  ciObject* as_object() {
+    assert(is_object(), "must be");
+    return (ciObject*)this;
+  }
+  ciMetadata* as_metadata() {
+    assert(is_metadata(), "must be");
+    return (ciMetadata*)this;
+  }
+};
+#endif // SHARE_VM_CI_CIBASEOBJECT_HPP