--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/back/FrameID.c	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2003-2005 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.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+#include "util.h"
+#include "FrameID.h"
+#include "threadControl.h"
+
+/* FrameID: */
+
+/* ------------------------------------------------------------ */
+/* | thread frame generation (48 bits)| frame number (16 bits)| */
+/* ------------------------------------------------------------ */
+
+#define FNUM_BWIDTH 16
+#define FNUM_BMASK ((1<<FNUM_BWIDTH)-1)
+
+FrameID
+createFrameID(jthread thread, FrameNumber fnum)
+{
+    FrameID frame;
+    jlong frameGeneration;
+
+    frameGeneration = threadControl_getFrameGeneration(thread);
+    frame = (frameGeneration<<FNUM_BWIDTH) | (jlong)fnum;
+    return frame;
+}
+
+FrameNumber
+getFrameNumber(FrameID frame)
+{
+    /*LINTED*/
+    return (FrameNumber)(((jint)frame) & FNUM_BMASK);
+}
+
+jdwpError
+validateFrameID(jthread thread, FrameID frame)
+{
+    jlong frameGeneration;
+
+    frameGeneration = threadControl_getFrameGeneration(thread);
+    if ( frameGeneration != (frame>>FNUM_BWIDTH)  ) {
+        return JDWP_ERROR(INVALID_FRAMEID);
+    }
+    return JDWP_ERROR(NONE);
+}