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1 /*
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2 * Copyright 2000-2004 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.oops;
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26
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27 import java.io.*;
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28 import sun.jvm.hotspot.runtime.BasicType;
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29 import sun.jvm.hotspot.utilities.*;
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30
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31 public class FieldType {
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32
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33 private Symbol signature;
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34 private char first;
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35
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36 public FieldType(Symbol signature) {
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37 this.signature = signature;
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38 this.first = (char) signature.getByteAt(0);
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39 if (Assert.ASSERTS_ENABLED) {
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40 switch (this.first) {
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41 case 'B':
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42 case 'C':
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43 case 'D':
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44 case 'F':
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45 case 'I':
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46 case 'J':
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47 case 'S':
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48 case 'Z':
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49 case 'L':
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50 case '[':
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51 break; // Ok. signature char known
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52 default:
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53 Assert.that(false, "Unknown char in field signature \"" + signature.asString() + "\": " + this.first);
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54 }
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55 }
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56 }
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57
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58 public boolean isOop() { return isObject() || isArray(); }
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59 public boolean isByte() { return first == 'B'; }
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60 public boolean isChar() { return first == 'C'; }
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61 public boolean isDouble() { return first == 'D'; }
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62 public boolean isFloat() { return first == 'F'; }
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63 public boolean isInt() { return first == 'I'; }
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64 public boolean isLong() { return first == 'J'; }
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65 public boolean isShort() { return first == 'S'; }
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66 public boolean isBoolean() { return first == 'Z'; }
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67 public boolean isObject() { return first == 'L'; }
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68 public boolean isArray() { return first == '['; }
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69
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70 public static class ArrayInfo {
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71 private int dimension;
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72 private int elementBasicType; // See BasicType.java
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73 // FIXME: consider adding name of element class
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74
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75 public ArrayInfo(int dimension, int elementBasicType) {
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76 this.dimension = dimension;
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77 this.elementBasicType = elementBasicType;
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78 }
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79
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80 public int dimension() { return dimension; }
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81 /** See BasicType.java */
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82 public int elementBasicType() { return elementBasicType; }
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83 }
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84
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85 /** Only valid for T_ARRAY; throws unspecified exception otherwise */
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86 public ArrayInfo getArrayInfo() {
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87 int index = 1;
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88 int dim = 1;
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89 index = skipOptionalSize(signature, index);
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90 while (signature.getByteAt(index) == '[') {
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91 index++;
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92 dim++;
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93 skipOptionalSize(signature, index);
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94 }
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95 int elementType = BasicType.charToType((char) signature.getByteAt(index));
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96 return new ArrayInfo(dim, elementType);
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97 }
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98
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99 private int skipOptionalSize(Symbol sig, int index) {
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100 byte c = sig.getByteAt(index);
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101 while (c >= '0' && c <= '9') {
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102 ++index;
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103 c = sig.getByteAt(index);
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104 }
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105 return index;
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106 }
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107 }
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