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1 /*
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2 * Copyright 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.debugger;
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26
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27 /** Base class for all twos-complement machine descriptions, which
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28 handles the cIntegerType{Min,Max}Value methods. */
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29
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30 public abstract class MachineDescriptionTwosComplement {
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31
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32 /** Handles 1, 2, 4, and 8-byte signed integers */
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33 private static final long[] signedMinValues = {
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34 Byte.MIN_VALUE,
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35 Short.MIN_VALUE,
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36 Integer.MIN_VALUE,
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37 Long.MIN_VALUE
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38 };
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39
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40 /** Handles 1, 2, 4, and 8-byte signed integers */
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41 private static final long[] signedMaxValues = {
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42 Byte.MAX_VALUE,
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43 Short.MAX_VALUE,
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44 Integer.MAX_VALUE,
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45 Long.MAX_VALUE
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46 };
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47
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48 /** Handles 1, 2, and 4-byte unsigned integers properly, with a bug
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49 in the 8-byte unsigned integer's constant */
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50 private static final long[] unsignedMaxValues = {
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51 255L,
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52 65535L,
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53 4294967295L,
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54 -1L
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55 };
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56
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57 public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned) {
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58 if (isUnsigned) {
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59 // Would be nice to signal to the caller that 8-byte unsigned
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60 // integers are not supported properly, but it looks like doing
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61 // so at this level will cause problems above
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62
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63 return tableLookup(sizeInBytes, unsignedMaxValues);
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64 } else {
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65 return tableLookup(sizeInBytes, signedMaxValues);
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66 }
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67 };
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68
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69 public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned) {
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70 if (isUnsigned) {
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71 return 0;
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72 }
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73
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74 return tableLookup(sizeInBytes, signedMinValues);
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75 }
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76
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77 // Nearly all of the supported machines are not LP64 */
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78 public boolean isLP64() {
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79 return false;
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80 }
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81
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82 private long tableLookup(long sizeInBytes, long[] table) {
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83 switch ((int) sizeInBytes) {
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84 case 1:
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85 return table[0];
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86 case 2:
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87 return table[1];
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88 case 4:
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89 return table[2];
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90 case 8:
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91 return table[3];
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92 default:
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93 throw new IllegalArgumentException("C integer type of " + sizeInBytes + " not supported");
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94 }
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95 }
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96 }
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