| /* |
| * Copyright (c) 2000, 2001, 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. |
| * |
| */ |
| |
| 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"); |
| } |
| } |
| } |