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1 /* |
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2 * Copyright 1999-2005 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. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any questions. |
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24 */ |
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25 |
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26 package com.sun.tools.javac.jvm; |
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27 |
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28 import com.sun.tools.javac.code.*; |
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29 import com.sun.tools.javac.util.*; |
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30 |
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31 /** A JVM class file. |
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32 * |
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33 * <p>Generic Java classfiles have one additional attribute for classes, |
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34 * methods and fields: |
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35 * <pre> |
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36 * "Signature" (u4 attr-length, u2 signature-index) |
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37 * </pre> |
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38 * |
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39 * <p>A signature gives the full Java type of a method or field. When |
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40 * used as a class attribute, it indicates type parameters, followed |
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41 * by supertype, followed by all interfaces. |
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42 * <pre> |
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43 * methodOrFieldSignature ::= type |
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44 * classSignature ::= [ typeparams ] supertype { interfacetype } |
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45 * </pre> |
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46 * <p>The type syntax in signatures is extended as follows: |
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47 * <pre> |
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48 * type ::= ... | classtype | methodtype | typevar |
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49 * classtype ::= classsig { '.' classsig } |
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50 * classig ::= 'L' name [typeargs] ';' |
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51 * methodtype ::= [ typeparams ] '(' { type } ')' type |
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52 * typevar ::= 'T' name ';' |
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53 * typeargs ::= '<' type { type } '>' |
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54 * typeparams ::= '<' typeparam { typeparam } '>' |
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55 * typeparam ::= name ':' type |
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56 * </pre> |
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57 * <p>This class defines constants used in class files as well |
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58 * as routines to convert between internal ``.'' and external ``/'' |
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59 * separators in class names. |
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60 * |
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61 * <p><b>This is NOT part of any API supported by Sun Microsystems. If |
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62 * you write code that depends on this, you do so at your own risk. |
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63 * This code and its internal interfaces are subject to change or |
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64 * deletion without notice.</b> */ |
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65 public class ClassFile { |
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66 |
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67 public final static int JAVA_MAGIC = 0xCAFEBABE; |
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68 |
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69 // see Target |
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70 public final static int CONSTANT_Utf8 = 1; |
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71 public final static int CONSTANT_Unicode = 2; |
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72 public final static int CONSTANT_Integer = 3; |
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73 public final static int CONSTANT_Float = 4; |
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74 public final static int CONSTANT_Long = 5; |
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75 public final static int CONSTANT_Double = 6; |
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76 public final static int CONSTANT_Class = 7; |
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77 public final static int CONSTANT_String = 8; |
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78 public final static int CONSTANT_Fieldref = 9; |
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79 public final static int CONSTANT_Methodref = 10; |
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80 public final static int CONSTANT_InterfaceMethodref = 11; |
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81 public final static int CONSTANT_NameandType = 12; |
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82 |
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83 public final static int MAX_PARAMETERS = 0xff; |
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84 public final static int MAX_DIMENSIONS = 0xff; |
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85 public final static int MAX_CODE = 0xffff; |
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86 public final static int MAX_LOCALS = 0xffff; |
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87 public final static int MAX_STACK = 0xffff; |
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88 |
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89 |
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90 /************************************************************************ |
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91 * String Translation Routines |
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92 ***********************************************************************/ |
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93 |
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94 /** Return internal representation of buf[offset..offset+len-1], |
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95 * converting '/' to '.'. |
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96 */ |
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97 public static byte[] internalize(byte[] buf, int offset, int len) { |
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98 byte[] translated = new byte[len]; |
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99 for (int j = 0; j < len; j++) { |
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100 byte b = buf[offset + j]; |
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101 if (b == '/') translated[j] = (byte) '.'; |
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102 else translated[j] = b; |
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103 } |
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104 return translated; |
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105 } |
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106 |
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107 /** Return internal representation of given name, |
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108 * converting '/' to '.'. |
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109 */ |
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110 public static byte[] internalize(Name name) { |
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111 return internalize(name.table.names, name.index, name.len); |
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112 } |
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113 |
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114 /** Return external representation of buf[offset..offset+len-1], |
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115 * converting '.' to '/'. |
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116 */ |
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117 public static byte[] externalize(byte[] buf, int offset, int len) { |
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118 byte[] translated = new byte[len]; |
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119 for (int j = 0; j < len; j++) { |
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120 byte b = buf[offset + j]; |
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121 if (b == '.') translated[j] = (byte) '/'; |
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122 else translated[j] = b; |
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123 } |
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124 return translated; |
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125 } |
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126 |
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127 /** Return external representation of given name, |
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128 * converting '/' to '.'. |
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129 */ |
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130 public static byte[] externalize(Name name) { |
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131 return externalize(name.table.names, name.index, name.len); |
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132 } |
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133 |
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134 /************************************************************************ |
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135 * Name-and-type |
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136 ***********************************************************************/ |
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137 |
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138 /** A class for the name-and-type signature of a method or field. |
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139 */ |
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140 public static class NameAndType { |
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141 Name name; |
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142 Type type; |
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143 |
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144 NameAndType(Name name, Type type) { |
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145 this.name = name; |
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146 this.type = type; |
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147 } |
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148 |
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149 public boolean equals(Object other) { |
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150 return |
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151 other instanceof NameAndType && |
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152 name == ((NameAndType) other).name && |
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153 type.equals(((NameAndType) other).type); |
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154 } |
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155 |
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156 public int hashCode() { |
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157 return name.hashCode() * type.hashCode(); |
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158 } |
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159 } |
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160 } |