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| 1 | +/* | |
| 2 | + * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.tools.java; | |
| 27 | + | |
| 28 | +import java.io.IOException; | |
| 29 | +import java.io.DataInputStream; | |
| 30 | +import java.io.DataOutputStream; | |
| 31 | +import java.util.Vector; | |
| 32 | +import java.util.Hashtable; | |
| 33 | + | |
| 34 | +/** | |
| 35 | + * This class is used to represent a constant table once | |
| 36 | + * it is read from a class file. | |
| 37 | + * | |
| 38 | + * WARNING: The contents of this source file are not part of any | |
| 39 | + * supported API. Code that depends on them does so at its own risk: | |
| 40 | + * they are subject to change or removal without notice. | |
| 41 | + */ | |
| 42 | +public final | |
| 43 | +class BinaryConstantPool implements Constants { | |
| 44 | + private byte types[]; | |
| 45 | + private Object cpool[]; | |
| 46 | + | |
| 47 | + /** | |
| 48 | + * Constructor | |
| 49 | + */ | |
| 50 | + BinaryConstantPool(DataInputStream in) throws IOException { | |
| 51 | + // JVM 4.1 ClassFile.constant_pool_count | |
| 52 | + types = new byte[in.readUnsignedShort()]; | |
| 53 | + cpool = new Object[types.length]; | |
| 54 | + for (int i = 1 ; i < cpool.length ; i++) { | |
| 55 | + int j = i; | |
| 56 | + // JVM 4.4 cp_info.tag | |
| 57 | + switch(types[i] = in.readByte()) { | |
| 58 | + case CONSTANT_UTF8: | |
| 59 | + cpool[i] = in.readUTF(); | |
| 60 | + break; | |
| 61 | + | |
| 62 | + case CONSTANT_INTEGER: | |
| 63 | + cpool[i] = new Integer(in.readInt()); | |
| 64 | + break; | |
| 65 | + case CONSTANT_FLOAT: | |
| 66 | + cpool[i] = new Float(in.readFloat()); | |
| 67 | + break; | |
| 68 | + case CONSTANT_LONG: | |
| 69 | + cpool[i++] = new Long(in.readLong()); | |
| 70 | + break; | |
| 71 | + case CONSTANT_DOUBLE: | |
| 72 | + cpool[i++] = new Double(in.readDouble()); | |
| 73 | + break; | |
| 74 | + | |
| 75 | + case CONSTANT_CLASS: | |
| 76 | + case CONSTANT_STRING: | |
| 77 | + // JVM 4.4.3 CONSTANT_String_info.string_index | |
| 78 | + // or JVM 4.4.1 CONSTANT_Class_info.name_index | |
| 79 | + cpool[i] = new Integer(in.readUnsignedShort()); | |
| 80 | + break; | |
| 81 | + | |
| 82 | + case CONSTANT_FIELD: | |
| 83 | + case CONSTANT_METHOD: | |
| 84 | + case CONSTANT_INTERFACEMETHOD: | |
| 85 | + case CONSTANT_NAMEANDTYPE: | |
| 86 | + // JVM 4.4.2 CONSTANT_*ref_info.class_index & name_and_type_index | |
| 87 | + cpool[i] = new Integer((in.readUnsignedShort() << 16) | in.readUnsignedShort()); | |
| 88 | + break; | |
| 89 | + | |
| 90 | + case 0: | |
| 91 | + default: | |
| 92 | + throw new ClassFormatError("invalid constant type: " + (int)types[i]); | |
| 93 | + } | |
| 94 | + } | |
| 95 | + } | |
| 96 | + | |
| 97 | + /** | |
| 98 | + * get a integer | |
| 99 | + */ | |
| 100 | + public int getInteger(int n) { | |
| 101 | + return (n == 0) ? 0 : ((Number)cpool[n]).intValue(); | |
| 102 | + } | |
| 103 | + | |
| 104 | + /** | |
| 105 | + * get a value | |
| 106 | + */ | |
| 107 | + public Object getValue(int n) { | |
| 108 | + return (n == 0) ? null : cpool[n]; | |
| 109 | + } | |
| 110 | + | |
| 111 | + /** | |
| 112 | + * get a string | |
| 113 | + */ | |
| 114 | + public String getString(int n) { | |
| 115 | + return (n == 0) ? null : (String)cpool[n]; | |
| 116 | + } | |
| 117 | + | |
| 118 | + /** | |
| 119 | + * get an identifier | |
| 120 | + */ | |
| 121 | + public Identifier getIdentifier(int n) { | |
| 122 | + return (n == 0) ? null : Identifier.lookup(getString(n)); | |
| 123 | + } | |
| 124 | + | |
| 125 | + /** | |
| 126 | + * get class declaration | |
| 127 | + */ | |
| 128 | + public ClassDeclaration getDeclarationFromName(Environment env, int n) { | |
| 129 | + return (n == 0) ? null : env.getClassDeclaration(Identifier.lookup(getString(n).replace('/','.'))); | |
| 130 | + } | |
| 131 | + | |
| 132 | + /** | |
| 133 | + * get class declaration | |
| 134 | + */ | |
| 135 | + public ClassDeclaration getDeclaration(Environment env, int n) { | |
| 136 | + return (n == 0) ? null : getDeclarationFromName(env, getInteger(n)); | |
| 137 | + } | |
| 138 | + | |
| 139 | + /** | |
| 140 | + * get a type from a type signature | |
| 141 | + */ | |
| 142 | + public Type getType(int n) { | |
| 143 | + return Type.tType(getString(n)); | |
| 144 | + } | |
| 145 | + | |
| 146 | + /** | |
| 147 | + * get the type of constant given an index | |
| 148 | + */ | |
| 149 | + public int getConstantType(int n) { | |
| 150 | + return types[n]; | |
| 151 | + } | |
| 152 | + | |
| 153 | + /** | |
| 154 | + * get the n-th constant from the constant pool | |
| 155 | + */ | |
| 156 | + public Object getConstant(int n, Environment env) { | |
| 157 | + int constant_type = getConstantType(n); | |
| 158 | + switch (constant_type) { | |
| 159 | + case CONSTANT_INTEGER: | |
| 160 | + case CONSTANT_FLOAT: | |
| 161 | + case CONSTANT_LONG: | |
| 162 | + case CONSTANT_DOUBLE: | |
| 163 | + return getValue(n); | |
| 164 | + | |
| 165 | + case CONSTANT_CLASS: | |
| 166 | + return getDeclaration(env, n); | |
| 167 | + | |
| 168 | + case CONSTANT_STRING: | |
| 169 | + return getString(getInteger(n)); | |
| 170 | + | |
| 171 | + case CONSTANT_FIELD: | |
| 172 | + case CONSTANT_METHOD: | |
| 173 | + case CONSTANT_INTERFACEMETHOD: | |
| 174 | + try { | |
| 175 | + int key = getInteger(n); | |
| 176 | + ClassDefinition clazz = | |
| 177 | + getDeclaration(env, key >> 16).getClassDefinition(env); | |
| 178 | + int name_and_type = getInteger(key & 0xFFFF); | |
| 179 | + Identifier id = getIdentifier(name_and_type >> 16); | |
| 180 | + Type type = getType(name_and_type & 0xFFFF); | |
| 181 | + | |
| 182 | + for (MemberDefinition field = clazz.getFirstMatch(id); | |
| 183 | + field != null; | |
| 184 | + field = field.getNextMatch()) { | |
| 185 | + Type field_type = field.getType(); | |
| 186 | + if ((constant_type == CONSTANT_FIELD) | |
| 187 | + ? (field_type == type) | |
| 188 | + : (field_type.equalArguments(type))) | |
| 189 | + return field; | |
| 190 | + } | |
| 191 | + } catch (ClassNotFound e) { | |
| 192 | + } | |
| 193 | + return null; | |
| 194 | + | |
| 195 | + default: | |
| 196 | + throw new ClassFormatError("invalid constant type: " + | |
| 197 | + constant_type); | |
| 198 | + } | |
| 199 | + } | |
| 200 | + | |
| 201 | + | |
| 202 | + /** | |
| 203 | + * Get a list of dependencies, ie: all the classes referenced in this | |
| 204 | + * constant pool. | |
| 205 | + */ | |
| 206 | + public Vector getDependencies(Environment env) { | |
| 207 | + Vector v = new Vector(); | |
| 208 | + for (int i = 1 ; i < cpool.length ; i++) { | |
| 209 | + switch(types[i]) { | |
| 210 | + case CONSTANT_CLASS: | |
| 211 | + v.addElement(getDeclarationFromName(env, getInteger(i))); | |
| 212 | + break; | |
| 213 | + } | |
| 214 | + } | |
| 215 | + return v; | |
| 216 | + } | |
| 217 | + | |
| 218 | + Hashtable indexHashObject, indexHashAscii; | |
| 219 | + Vector MoreStuff; | |
| 220 | + | |
| 221 | + /** | |
| 222 | + * Find the index of an Object in the constant pool | |
| 223 | + */ | |
| 224 | + public int indexObject(Object obj, Environment env) { | |
| 225 | + if (indexHashObject == null) | |
| 226 | + createIndexHash(env); | |
| 227 | + Integer result = (Integer)indexHashObject.get(obj); | |
| 228 | + if (result == null) | |
| 229 | + throw new IndexOutOfBoundsException("Cannot find object " + obj + " of type " + | |
| 230 | + obj.getClass() + " in constant pool"); | |
| 231 | + return result.intValue(); | |
| 232 | + } | |
| 233 | + | |
| 234 | + /** | |
| 235 | + * Find the index of an ascii string in the constant pool. If it's not in | |
| 236 | + * the constant pool, then add it at the end. | |
| 237 | + */ | |
| 238 | + public int indexString(String string, Environment env) { | |
| 239 | + if (indexHashObject == null) | |
| 240 | + createIndexHash(env); | |
| 241 | + Integer result = (Integer)indexHashAscii.get(string); | |
| 242 | + if (result == null) { | |
| 243 | + if (MoreStuff == null) MoreStuff = new Vector(); | |
| 244 | + result = new Integer(cpool.length + MoreStuff.size()); | |
| 245 | + MoreStuff.addElement(string); | |
| 246 | + indexHashAscii.put(string, result); | |
| 247 | + } | |
| 248 | + return result.intValue(); | |
| 249 | + } | |
| 250 | + | |
| 251 | + /** | |
| 252 | + * Create a hash table of all the items in the constant pool that could | |
| 253 | + * possibly be referenced from the outside. | |
| 254 | + */ | |
| 255 | + | |
| 256 | + public void createIndexHash(Environment env) { | |
| 257 | + indexHashObject = new Hashtable(); | |
| 258 | + indexHashAscii = new Hashtable(); | |
| 259 | + for (int i = 1; i < cpool.length; i++) { | |
| 260 | + if (types[i] == CONSTANT_UTF8) { | |
| 261 | + indexHashAscii.put(cpool[i], new Integer(i)); | |
| 262 | + } else { | |
| 263 | + try { | |
| 264 | + indexHashObject.put(getConstant(i, env), new Integer(i)); | |
| 265 | + } catch (ClassFormatError e) { } | |
| 266 | + } | |
| 267 | + } | |
| 268 | + } | |
| 269 | + | |
| 270 | + | |
| 271 | + /** | |
| 272 | + * Write out the contents of the constant pool, including any additions | |
| 273 | + * that have been added. | |
| 274 | + */ | |
| 275 | + public void write(DataOutputStream out, Environment env) throws IOException { | |
| 276 | + int length = cpool.length; | |
| 277 | + if (MoreStuff != null) | |
| 278 | + length += MoreStuff.size(); | |
| 279 | + out.writeShort(length); | |
| 280 | + for (int i = 1 ; i < cpool.length; i++) { | |
| 281 | + int type = types[i]; | |
| 282 | + Object x = cpool[i]; | |
| 283 | + out.writeByte(type); | |
| 284 | + switch (type) { | |
| 285 | + case CONSTANT_UTF8: | |
| 286 | + out.writeUTF((String) x); | |
| 287 | + break; | |
| 288 | + case CONSTANT_INTEGER: | |
| 289 | + out.writeInt(((Number)x).intValue()); | |
| 290 | + break; | |
| 291 | + case CONSTANT_FLOAT: | |
| 292 | + out.writeFloat(((Number)x).floatValue()); | |
| 293 | + break; | |
| 294 | + case CONSTANT_LONG: | |
| 295 | + out.writeLong(((Number)x).longValue()); | |
| 296 | + i++; | |
| 297 | + break; | |
| 298 | + case CONSTANT_DOUBLE: | |
| 299 | + out.writeDouble(((Number)x).doubleValue()); | |
| 300 | + i++; | |
| 301 | + break; | |
| 302 | + case CONSTANT_CLASS: | |
| 303 | + case CONSTANT_STRING: | |
| 304 | + out.writeShort(((Number)x).intValue()); | |
| 305 | + break; | |
| 306 | + case CONSTANT_FIELD: | |
| 307 | + case CONSTANT_METHOD: | |
| 308 | + case CONSTANT_INTERFACEMETHOD: | |
| 309 | + case CONSTANT_NAMEANDTYPE: { | |
| 310 | + int value = ((Number)x).intValue(); | |
| 311 | + out.writeShort(value >> 16); | |
| 312 | + out.writeShort(value & 0xFFFF); | |
| 313 | + break; | |
| 314 | + } | |
| 315 | + default: | |
| 316 | + throw new ClassFormatError("invalid constant type: " | |
| 317 | + + (int)types[i]); | |
| 318 | + } | |
| 319 | + } | |
| 320 | + for (int i = cpool.length; i < length; i++) { | |
| 321 | + String string = (String)(MoreStuff.elementAt(i - cpool.length)); | |
| 322 | + out.writeByte(CONSTANT_UTF8); | |
| 323 | + out.writeUTF(string); | |
| 324 | + } | |
| 325 | + } | |
| 326 | + | |
| 327 | +} | |