--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/debugger/MachineDescriptionTwosComplement.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,96 @@
+/*
+ * 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.
+ *
+ */
+
+package sun.jvm.hotspot.debugger;
+
+/** Base class for all twos-complement machine descriptions, which
+    handles the cIntegerType{Min,Max}Value methods. */
+
+public abstract class MachineDescriptionTwosComplement {
+
+  /** Handles 1, 2, 4, and 8-byte signed integers */
+  private static final long[] signedMinValues = {
+    Byte.MIN_VALUE,
+    Short.MIN_VALUE,
+    Integer.MIN_VALUE,
+    Long.MIN_VALUE
+  };
+
+  /** Handles 1, 2, 4, and 8-byte signed integers */
+  private static final long[] signedMaxValues = {
+    Byte.MAX_VALUE,
+    Short.MAX_VALUE,
+    Integer.MAX_VALUE,
+    Long.MAX_VALUE
+  };
+
+  /** Handles 1, 2, and 4-byte unsigned integers properly, with a bug
+      in the 8-byte unsigned integer's constant */
+  private static final long[] unsignedMaxValues = {
+    255L,
+    65535L,
+    4294967295L,
+    -1L
+  };
+
+  public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned) {
+    if (isUnsigned) {
+      // Would be nice to signal to the caller that 8-byte unsigned
+      // integers are not supported properly, but it looks like doing
+      // so at this level will cause problems above
+
+      return tableLookup(sizeInBytes, unsignedMaxValues);
+    } else {
+      return tableLookup(sizeInBytes, signedMaxValues);
+    }
+  };
+
+  public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned) {
+    if (isUnsigned) {
+      return 0;
+    }
+
+    return tableLookup(sizeInBytes, signedMinValues);
+  }
+
+  // Nearly all of the supported machines are not LP64 */
+  public boolean isLP64() {
+    return false;
+  }
+
+  private long tableLookup(long sizeInBytes, long[] table) {
+    switch ((int) sizeInBytes) {
+    case 1:
+      return table[0];
+    case 2:
+      return table[1];
+    case 4:
+      return table[2];
+    case 8:
+      return table[3];
+    default:
+      throw new IllegalArgumentException("C integer type of " + sizeInBytes + " not supported");
+    }
+  }
+}