001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.compress.harmony.unpack200.bytecode.forms; 018 019import java.util.Arrays; 020import java.util.HashMap; 021import java.util.Map; 022 023import org.apache.commons.compress.harmony.unpack200.bytecode.ByteCode; 024import org.apache.commons.compress.harmony.unpack200.bytecode.CodeAttribute; 025import org.apache.commons.compress.harmony.unpack200.bytecode.OperandManager; 026 027public abstract class ByteCodeForm { 028 029 protected static final boolean WIDENED = true; 030 031 protected static final ByteCodeForm[] byteCodeArray = new ByteCodeForm[256]; 032 protected static final Map<String, ByteCodeForm> byteCodesByName = new HashMap<>(256); 033 static { 034 byteCodeArray[0] = new NoArgumentForm(0, "nop"); 035 byteCodeArray[1] = new NoArgumentForm(1, "aconst_null"); 036 byteCodeArray[2] = new NoArgumentForm(2, "iconst_m1"); 037 byteCodeArray[3] = new NoArgumentForm(3, "iconst_0"); 038 byteCodeArray[4] = new NoArgumentForm(4, "iconst_1"); 039 byteCodeArray[5] = new NoArgumentForm(5, "iconst_2"); 040 byteCodeArray[6] = new NoArgumentForm(6, "iconst_3"); 041 byteCodeArray[7] = new NoArgumentForm(7, "iconst_4"); 042 byteCodeArray[8] = new NoArgumentForm(8, "iconst_5"); 043 byteCodeArray[9] = new NoArgumentForm(9, "lconst_0"); 044 byteCodeArray[10] = new NoArgumentForm(10, "lconst_1"); 045 byteCodeArray[11] = new NoArgumentForm(11, "fconst_0"); 046 byteCodeArray[12] = new NoArgumentForm(12, "fconst_1"); 047 byteCodeArray[13] = new NoArgumentForm(13, "fconst_2"); 048 byteCodeArray[14] = new NoArgumentForm(14, "dconst_0"); 049 byteCodeArray[15] = new NoArgumentForm(15, "dconst_1"); 050 byteCodeArray[16] = new ByteForm(16, "bipush", new int[] { 16, -1 }); 051 byteCodeArray[17] = new ShortForm(17, "sipush", new int[] { 17, -1, -1 }); 052 byteCodeArray[18] = new StringRefForm(18, "ldc", new int[] { 18, -1 }); 053 byteCodeArray[19] = new StringRefForm(19, "ldc_w", new int[] { 19, -1, -1 }, WIDENED); 054 byteCodeArray[20] = new LongForm(20, "ldc2_w", new int[] { 20, -1, -1 }); 055 byteCodeArray[21] = new LocalForm(21, "iload", new int[] { 21, -1 }); 056 byteCodeArray[22] = new LocalForm(22, "lload", new int[] { 22, -1 }); 057 byteCodeArray[23] = new LocalForm(23, "fload", new int[] { 23, -1 }); 058 byteCodeArray[24] = new LocalForm(24, "dload", new int[] { 24, -1 }); 059 byteCodeArray[25] = new LocalForm(25, "aload", new int[] { 25, -1 }); 060 byteCodeArray[26] = new NoArgumentForm(26, "iload_0"); 061 byteCodeArray[27] = new NoArgumentForm(27, "iload_1"); 062 byteCodeArray[28] = new NoArgumentForm(28, "iload_2"); 063 byteCodeArray[29] = new NoArgumentForm(29, "iload_3"); 064 byteCodeArray[30] = new NoArgumentForm(30, "lload_0"); 065 byteCodeArray[31] = new NoArgumentForm(31, "lload_1"); 066 byteCodeArray[32] = new NoArgumentForm(32, "lload_2"); 067 byteCodeArray[33] = new NoArgumentForm(33, "lload_3"); 068 byteCodeArray[34] = new NoArgumentForm(34, "fload_0"); 069 byteCodeArray[35] = new NoArgumentForm(35, "fload_1"); 070 byteCodeArray[36] = new NoArgumentForm(36, "fload_2"); 071 byteCodeArray[37] = new NoArgumentForm(37, "fload_3"); 072 byteCodeArray[38] = new NoArgumentForm(38, "dload_0"); 073 byteCodeArray[39] = new NoArgumentForm(39, "dload_1"); 074 byteCodeArray[40] = new NoArgumentForm(40, "dload_2"); 075 byteCodeArray[41] = new NoArgumentForm(41, "dload_3"); 076 byteCodeArray[42] = new NoArgumentForm(42, "aload_0"); 077 byteCodeArray[43] = new NoArgumentForm(43, "aload_1"); 078 byteCodeArray[44] = new NoArgumentForm(44, "aload_2"); 079 byteCodeArray[45] = new NoArgumentForm(45, "aload_3"); 080 byteCodeArray[46] = new NoArgumentForm(46, "iaload"); 081 byteCodeArray[47] = new NoArgumentForm(47, "laload"); 082 byteCodeArray[48] = new NoArgumentForm(48, "faload"); 083 byteCodeArray[49] = new NoArgumentForm(49, "daload"); 084 byteCodeArray[50] = new NoArgumentForm(50, "aaload"); 085 byteCodeArray[51] = new NoArgumentForm(51, "baload"); 086 byteCodeArray[52] = new NoArgumentForm(52, "caload"); 087 byteCodeArray[53] = new NoArgumentForm(53, "saload"); 088 byteCodeArray[54] = new LocalForm(54, "istore", new int[] { 54, -1 }); 089 byteCodeArray[55] = new LocalForm(55, "lstore", new int[] { 55, -1 }); 090 byteCodeArray[56] = new LocalForm(56, "fstore", new int[] { 56, -1 }); 091 byteCodeArray[57] = new LocalForm(57, "dstore", new int[] { 57, -1 }); 092 byteCodeArray[58] = new LocalForm(58, "astore", new int[] { 58, -1 }); 093 byteCodeArray[59] = new NoArgumentForm(59, "istore_0"); 094 byteCodeArray[60] = new NoArgumentForm(60, "istore_1"); 095 byteCodeArray[61] = new NoArgumentForm(61, "istore_2"); 096 byteCodeArray[62] = new NoArgumentForm(62, "istore_3"); 097 byteCodeArray[63] = new NoArgumentForm(63, "lstore_0"); 098 byteCodeArray[64] = new NoArgumentForm(64, "lstore_1"); 099 byteCodeArray[65] = new NoArgumentForm(65, "lstore_2"); 100 byteCodeArray[66] = new NoArgumentForm(66, "lstore_3"); 101 byteCodeArray[67] = new NoArgumentForm(67, "fstore_0"); 102 byteCodeArray[68] = new NoArgumentForm(68, "fstore_1"); 103 byteCodeArray[69] = new NoArgumentForm(69, "fstore_2"); 104 byteCodeArray[70] = new NoArgumentForm(70, "fstore_3"); 105 byteCodeArray[71] = new NoArgumentForm(71, "dstore_0"); 106 byteCodeArray[72] = new NoArgumentForm(72, "dstore_1"); 107 byteCodeArray[73] = new NoArgumentForm(73, "dstore_2"); 108 byteCodeArray[74] = new NoArgumentForm(74, "dstore_3"); 109 byteCodeArray[75] = new NoArgumentForm(75, "astore_0"); 110 byteCodeArray[76] = new NoArgumentForm(76, "astore_1"); 111 byteCodeArray[77] = new NoArgumentForm(77, "astore_2"); 112 byteCodeArray[78] = new NoArgumentForm(78, "astore_3"); 113 byteCodeArray[79] = new NoArgumentForm(79, "iastore"); 114 byteCodeArray[80] = new NoArgumentForm(80, "lastore"); 115 byteCodeArray[81] = new NoArgumentForm(81, "fastore"); 116 byteCodeArray[82] = new NoArgumentForm(82, "dastore"); 117 byteCodeArray[83] = new NoArgumentForm(83, "aastore"); 118 byteCodeArray[84] = new NoArgumentForm(84, "bastore"); 119 byteCodeArray[85] = new NoArgumentForm(85, "castore"); 120 byteCodeArray[86] = new NoArgumentForm(86, "sastore"); 121 byteCodeArray[87] = new NoArgumentForm(87, "pop"); 122 byteCodeArray[88] = new NoArgumentForm(88, "pop2"); 123 byteCodeArray[89] = new NoArgumentForm(89, "dup"); 124 byteCodeArray[90] = new NoArgumentForm(90, "dup_x1"); 125 byteCodeArray[91] = new NoArgumentForm(91, "dup_x2"); 126 byteCodeArray[92] = new NoArgumentForm(92, "dup2"); 127 byteCodeArray[93] = new NoArgumentForm(93, "dup2_x1"); 128 byteCodeArray[94] = new NoArgumentForm(94, "dup2_x2"); 129 byteCodeArray[95] = new NoArgumentForm(95, "swap"); 130 byteCodeArray[96] = new NoArgumentForm(96, "iadd"); 131 byteCodeArray[97] = new NoArgumentForm(97, "ladd"); 132 byteCodeArray[98] = new NoArgumentForm(98, "fadd"); 133 byteCodeArray[99] = new NoArgumentForm(99, "dadd"); 134 byteCodeArray[100] = new NoArgumentForm(100, "isub"); 135 byteCodeArray[101] = new NoArgumentForm(101, "lsub"); 136 byteCodeArray[102] = new NoArgumentForm(102, "fsub"); 137 byteCodeArray[103] = new NoArgumentForm(103, "dsub"); 138 byteCodeArray[104] = new NoArgumentForm(104, "imul"); 139 byteCodeArray[105] = new NoArgumentForm(105, "lmul"); 140 byteCodeArray[106] = new NoArgumentForm(106, "fmul"); 141 byteCodeArray[107] = new NoArgumentForm(107, "dmul"); 142 byteCodeArray[108] = new NoArgumentForm(108, "idiv"); 143 byteCodeArray[109] = new NoArgumentForm(109, "ldiv"); 144 byteCodeArray[110] = new NoArgumentForm(110, "fdiv"); 145 byteCodeArray[111] = new NoArgumentForm(111, "ddiv"); 146 byteCodeArray[112] = new NoArgumentForm(112, "irem"); 147 byteCodeArray[113] = new NoArgumentForm(113, "lrem"); 148 byteCodeArray[114] = new NoArgumentForm(114, "frem"); 149 byteCodeArray[115] = new NoArgumentForm(115, "drem"); 150 byteCodeArray[116] = new NoArgumentForm(116, ""); 151 byteCodeArray[117] = new NoArgumentForm(117, "lneg"); 152 byteCodeArray[118] = new NoArgumentForm(118, "fneg"); 153 byteCodeArray[119] = new NoArgumentForm(119, "dneg"); 154 byteCodeArray[120] = new NoArgumentForm(120, "ishl"); 155 byteCodeArray[121] = new NoArgumentForm(121, "lshl"); 156 byteCodeArray[122] = new NoArgumentForm(122, "ishr"); 157 byteCodeArray[123] = new NoArgumentForm(123, "lshr"); 158 byteCodeArray[124] = new NoArgumentForm(124, "iushr"); 159 byteCodeArray[125] = new NoArgumentForm(125, "lushr"); 160 byteCodeArray[126] = new NoArgumentForm(126, "iand"); 161 byteCodeArray[127] = new NoArgumentForm(127, "land"); 162 byteCodeArray[128] = new NoArgumentForm(128, "ior"); 163 byteCodeArray[129] = new NoArgumentForm(129, "lor"); 164 byteCodeArray[130] = new NoArgumentForm(130, "ixor"); 165 byteCodeArray[131] = new NoArgumentForm(131, "lxor"); 166 byteCodeArray[132] = new IincForm(132, "iinc", new int[] { 132, -1, -1 }); 167 byteCodeArray[133] = new NoArgumentForm(133, "i2l"); 168 byteCodeArray[134] = new NoArgumentForm(134, "i2f"); 169 byteCodeArray[135] = new NoArgumentForm(135, "i2d"); 170 byteCodeArray[136] = new NoArgumentForm(136, "l2i"); 171 byteCodeArray[137] = new NoArgumentForm(137, "l2f"); 172 byteCodeArray[138] = new NoArgumentForm(138, "l2d"); 173 byteCodeArray[139] = new NoArgumentForm(139, "f2i"); 174 byteCodeArray[140] = new NoArgumentForm(140, "f2l"); 175 byteCodeArray[141] = new NoArgumentForm(141, "f2d"); 176 byteCodeArray[142] = new NoArgumentForm(142, "d2i"); 177 byteCodeArray[143] = new NoArgumentForm(143, "d2l"); 178 byteCodeArray[144] = new NoArgumentForm(144, "d2f"); 179 byteCodeArray[145] = new NoArgumentForm(145, "i2b"); 180 byteCodeArray[146] = new NoArgumentForm(146, "i2c"); 181 byteCodeArray[147] = new NoArgumentForm(147, "i2s"); 182 byteCodeArray[148] = new NoArgumentForm(148, "lcmp"); 183 byteCodeArray[149] = new NoArgumentForm(149, "fcmpl"); 184 byteCodeArray[150] = new NoArgumentForm(150, "fcmpg"); 185 byteCodeArray[151] = new NoArgumentForm(151, "dcmpl"); 186 byteCodeArray[152] = new NoArgumentForm(152, "dcmpg"); 187 byteCodeArray[153] = new LabelForm(153, "ifeq", new int[] { 153, -1, -1 }); 188 byteCodeArray[154] = new LabelForm(154, "ifne", new int[] { 154, -1, -1 }); 189 byteCodeArray[155] = new LabelForm(155, "iflt", new int[] { 155, -1, -1 }); 190 byteCodeArray[156] = new LabelForm(156, "ifge", new int[] { 156, -1, -1 }); 191 byteCodeArray[157] = new LabelForm(157, "ifgt", new int[] { 157, -1, -1 }); 192 byteCodeArray[158] = new LabelForm(158, "ifle", new int[] { 158, -1, -1 }); 193 byteCodeArray[159] = new LabelForm(159, "if_icmpeq", new int[] { 159, -1, -1 }); 194 byteCodeArray[160] = new LabelForm(160, "if_icmpne", new int[] { 160, -1, -1 }); 195 byteCodeArray[161] = new LabelForm(161, "if_icmplt", new int[] { 161, -1, -1 }); 196 byteCodeArray[162] = new LabelForm(162, "if_icmpge", new int[] { 162, -1, -1 }); 197 byteCodeArray[163] = new LabelForm(163, "if_icmpgt", new int[] { 163, -1, -1 }); 198 byteCodeArray[164] = new LabelForm(164, "if_icmple", new int[] { 164, -1, -1 }); 199 byteCodeArray[165] = new LabelForm(165, "if_acmpeq", new int[] { 165, -1, -1 }); 200 byteCodeArray[166] = new LabelForm(166, "if_acmpne", new int[] { 166, -1, -1 }); 201 byteCodeArray[167] = new LabelForm(167, "goto", new int[] { 167, -1, -1 }); 202 byteCodeArray[168] = new LabelForm(168, "jsr", new int[] { 168, -1, -1 }); 203 byteCodeArray[169] = new LocalForm(169, "ret", new int[] { 169, -1 }); 204 byteCodeArray[170] = new TableSwitchForm(170, "tableswitch"); 205 byteCodeArray[171] = new LookupSwitchForm(171, "lookupswitch"); 206 byteCodeArray[172] = new NoArgumentForm(172, "ireturn"); 207 byteCodeArray[173] = new NoArgumentForm(173, "lreturn"); 208 byteCodeArray[174] = new NoArgumentForm(174, "freturn"); 209 byteCodeArray[175] = new NoArgumentForm(175, "dreturn"); 210 byteCodeArray[176] = new NoArgumentForm(176, "areturn"); 211 byteCodeArray[177] = new NoArgumentForm(177, "return"); 212 byteCodeArray[178] = new FieldRefForm(178, "getstatic", new int[] { 178, -1, -1 }); 213 byteCodeArray[179] = new FieldRefForm(179, "putstatic", new int[] { 179, -1, -1 }); 214 byteCodeArray[180] = new FieldRefForm(180, "getfield", new int[] { 180, -1, -1 }); 215 byteCodeArray[181] = new FieldRefForm(181, "putfield", new int[] { 181, -1, -1 }); 216 byteCodeArray[182] = new MethodRefForm(182, "invokevirtual", new int[] { 182, -1, -1 }); 217 byteCodeArray[183] = new MethodRefForm(183, "invokespecial", new int[] { 183, -1, -1 }); 218 byteCodeArray[184] = new MethodRefForm(184, "invokestatic", new int[] { 184, -1, -1 }); 219 byteCodeArray[185] = new IMethodRefForm(185, "invokeinterface", new int[] { 185, -1, -1, /* count */-1, 0 }); 220 byteCodeArray[186] = new NoArgumentForm(186, "xxxunusedxxx"); 221 byteCodeArray[187] = new NewClassRefForm(187, "new", new int[] { 187, -1, -1 }); 222 byteCodeArray[188] = new ByteForm(188, "newarray", new int[] { 188, -1 }); 223 byteCodeArray[189] = new ClassRefForm(189, "anewarray", new int[] { 189, -1, -1 }); 224 byteCodeArray[190] = new NoArgumentForm(190, "arraylength"); 225 byteCodeArray[191] = new NoArgumentForm(191, "athrow"); 226 byteCodeArray[192] = new ClassRefForm(192, "checkcast", new int[] { 192, -1, -1 }); 227 byteCodeArray[193] = new ClassRefForm(193, "instanceof", new int[] { 193, -1, -1 }); 228 byteCodeArray[194] = new NoArgumentForm(194, "monitorenter"); 229 byteCodeArray[195] = new NoArgumentForm(195, "monitorexit"); 230 byteCodeArray[196] = new WideForm(196, "wide"); 231 byteCodeArray[197] = new MultiANewArrayForm(197, "multianewarray", new int[] { 197, -1, -1, -1 }); 232 byteCodeArray[198] = new LabelForm(198, "ifnull", new int[] { 198, -1, -1 }); 233 byteCodeArray[199] = new LabelForm(199, "ifnonnull", new int[] { 199, -1, -1 }); 234 byteCodeArray[200] = new LabelForm(200, "goto_w", new int[] { 200, -1, -1, -1, -1 }, WIDENED); 235 byteCodeArray[201] = new LabelForm(201, "jsr_w", new int[] { 201, -1, -1, -1, -1 }, WIDENED); 236 237 // Extra ones defined by pack200 238 byteCodeArray[202] = new ThisFieldRefForm(202, "getstatic_this", new int[] { 178, -1, -1 }); 239 byteCodeArray[203] = new ThisFieldRefForm(203, "putstatic_this", new int[] { 179, -1, -1 }); 240 byteCodeArray[204] = new ThisFieldRefForm(204, "getfield_this", new int[] { 180, -1, -1 }); 241 byteCodeArray[205] = new ThisFieldRefForm(205, "putfield_this", new int[] { 181, -1, -1 }); 242 byteCodeArray[206] = new ThisMethodRefForm(206, "invokevirtual_this", new int[] { 182, -1, -1 }); 243 byteCodeArray[207] = new ThisMethodRefForm(207, "invokespecial_this", new int[] { 183, -1, -1 }); 244 byteCodeArray[208] = new ThisMethodRefForm(208, "invokestatic_this", new int[] { 184, -1, -1 }); 245 byteCodeArray[209] = new ThisFieldRefForm(209, "aload_0_getstatic_this", new int[] { 42, 178, -1, -1 }); 246 byteCodeArray[210] = new ThisFieldRefForm(210, "aload_0_putstatic_this", new int[] { 42, 179, -1, -1 }); 247 byteCodeArray[211] = new ThisFieldRefForm(211, "aload_0_getfield_this", new int[] { 42, 180, -1, -1 }); 248 byteCodeArray[212] = new ThisFieldRefForm(212, "aload_0_putfield_this", new int[] { 42, 181, -1, -1 }); 249 byteCodeArray[213] = new ThisMethodRefForm(213, "aload_0_invokevirtual_this", new int[] { 42, 182, -1, -1 }); 250 byteCodeArray[214] = new ThisMethodRefForm(214, "aload_0_invokespecial_this", new int[] { 42, 183, -1, -1 }); 251 byteCodeArray[215] = new ThisMethodRefForm(215, "aload_0_invokestatic_this", new int[] { 42, 184, -1, -1 }); 252 byteCodeArray[216] = new SuperFieldRefForm(216, "getstatic_super", new int[] { 178, -1, -1 }); 253 byteCodeArray[217] = new SuperFieldRefForm(217, "putstatic_super", new int[] { 179, -1, -1 }); 254 byteCodeArray[218] = new SuperFieldRefForm(218, "getfield_super", new int[] { 180, -1, -1 }); 255 byteCodeArray[219] = new SuperFieldRefForm(219, "putfield_super", new int[] { 181, -1, -1 }); 256 byteCodeArray[220] = new SuperMethodRefForm(220, "invokevirtual_super", new int[] { 182, -1, -1 }); 257 byteCodeArray[221] = new SuperMethodRefForm(221, "invokespecial_super", new int[] { 183, -1, -1 }); 258 byteCodeArray[222] = new SuperMethodRefForm(222, "invokestatic_super", new int[] { 184, -1, -1 }); 259 byteCodeArray[223] = new SuperFieldRefForm(223, "aload_0_getstatic_super", new int[] { 42, 178, -1, -1 }); 260 byteCodeArray[224] = new SuperFieldRefForm(224, "aload_0_putstatic_super", new int[] { 42, 179, -1, -1 }); 261 byteCodeArray[225] = new SuperFieldRefForm(225, "aload_0_getfield_super", new int[] { 42, 180, -1, -1 }); 262 byteCodeArray[226] = new SuperFieldRefForm(226, "aload_0_putfield_super", new int[] { 42, 181, -1, -1 }); 263 byteCodeArray[227] = new SuperMethodRefForm(227, "aload_0_invokevirtual_super", new int[] { 42, 182, -1, -1 }); 264 byteCodeArray[228] = new SuperMethodRefForm(228, "aload_0_invokespecial_super", new int[] { 42, 183, -1, -1 }); 265 byteCodeArray[229] = new SuperMethodRefForm(229, "aload_0_invokestatic_super", new int[] { 42, 184, -1, -1 }); 266 byteCodeArray[230] = new ThisInitMethodRefForm(230, "invokespecial_this_init", new int[] { 183, -1, -1 }); 267 byteCodeArray[231] = new SuperInitMethodRefForm(231, "invokespecial_super_init", new int[] { 183, -1, -1 }); 268 byteCodeArray[232] = new NewInitMethodRefForm(232, "invokespecial_new_init", new int[] { 183, -1, -1 }); 269 byteCodeArray[233] = new NarrowClassRefForm(233, "cldc", new int[] { 18, -1 }); 270 byteCodeArray[234] = new IntRefForm(234, "ildc", new int[] { 18, -1 }); 271 byteCodeArray[235] = new FloatRefForm(235, "fldc", new int[] { 18, -1 }); 272 byteCodeArray[236] = new NarrowClassRefForm(236, "cldc_w", new int[] { 19, -1, -1 }, WIDENED); 273 byteCodeArray[237] = new IntRefForm(237, "ildc_w", new int[] { 19, -1, -1 }, WIDENED); 274 byteCodeArray[238] = new FloatRefForm(238, "fldc_w", new int[] { 19, -1, -1 }, WIDENED); 275 byteCodeArray[239] = new DoubleForm(239, "dldc2_w", new int[] { 20, -1, -1 }); 276 277 // Reserved bytecodes 278 byteCodeArray[254] = new NoArgumentForm(254, "impdep1"); 279 byteCodeArray[255] = new NoArgumentForm(255, "impdep2"); 280 281 // Bytecodes that aren't defined in the spec but are useful when 282 // unpacking (all must be >255) 283 // maybe wide versions of the others? etc. 284 285 // Put all the bytecodes in a HashMap so we can 286 // get them by either name or number 287 for (final ByteCodeForm byteCode : byteCodeArray) { 288 if (byteCode != null) { 289 byteCodesByName.put(byteCode.getName(), byteCode); 290 } 291 } 292 } 293 294 public static ByteCodeForm get(final int opcode) { 295 return byteCodeArray[opcode]; 296 } 297 298 private final int opcode; 299 private final String name; 300 private final int[] rewrite; 301 private int firstOperandIndex; 302 303 private int operandLength; 304 305 /** 306 * Answer a new instance of this class with the specified opcode and name. Assume no rewrite. 307 * 308 * @param opcode int corresponding to the opcode's value 309 * @param name String printable name of the opcode 310 */ 311 public ByteCodeForm(final int opcode, final String name) { 312 this(opcode, name, new int[] { opcode }); 313 } 314 315 /** 316 * Answer a new instance of this class with the specified opcode, name, operandType and rewrite 317 * 318 * @param opcode int corresponding to the opcode's value 319 * @param name String printable name of the opcode 320 * @param rewrite int[] Array of ints. Operand positions (which will later be rewritten in ByteCodes) are indicated by -1. 321 */ 322 public ByteCodeForm(final int opcode, final String name, final int[] rewrite) { 323 this.opcode = opcode; 324 this.name = name; 325 this.rewrite = rewrite; 326 calculateOperandPosition(); 327 } 328 329 protected void calculateOperandPosition() { 330 firstOperandIndex = -1; 331 operandLength = -1; 332 333 // Find the first negative number in the rewrite array 334 int iterationIndex = 0; 335 while (iterationIndex < rewrite.length) { 336 if (rewrite[iterationIndex] < 0) { 337 // Found the first opcode to substitute 338 firstOperandIndex = iterationIndex; 339 iterationIndex = rewrite.length; 340 } else { 341 iterationIndex++; 342 } 343 } 344 345 if (firstOperandIndex == -1) { 346 // Nothing more to do since the opcode has no operands 347 return; 348 } 349 350 // Find the last negative number in the rewrite array 351 int lastOperandIndex = -1; 352 iterationIndex = firstOperandIndex; 353 while (iterationIndex < rewrite.length) { 354 if (rewrite[iterationIndex] < 0) { 355 lastOperandIndex = iterationIndex; 356 } 357 iterationIndex++; 358 } 359 360 // Now we have the first index and the last index. 361 final int difference = lastOperandIndex - firstOperandIndex; 362 363 // If last < first, something is wrong. 364 if (difference < 0) { 365 throw new Error("Logic error: not finding rewrite operands correctly"); 366 } 367 operandLength = difference + 1; 368 } 369 370 public int firstOperandIndex() { 371 return firstOperandIndex; 372 } 373 374 /** 375 * The ByteCodeForm knows how to fix up a bytecode if it needs to be fixed up because it holds a Label bytecode. 376 * 377 * @param byteCode a ByteCode to be fixed up 378 * @param codeAttribute a CodeAttribute used to determine how the ByteCode should be fixed up. 379 */ 380 public void fixUpByteCodeTargets(final ByteCode byteCode, final CodeAttribute codeAttribute) { 381 // Most ByteCodeForms don't have any fixing up to do. 382 } 383 384 public String getName() { 385 return name; 386 } 387 388 public int getOpcode() { 389 return opcode; 390 } 391 392 public int[] getRewrite() { 393 return rewrite; 394 } 395 396 public int[] getRewriteCopy() { 397 return Arrays.copyOf(rewrite, rewrite.length); 398 } 399 400 /** 401 * This method will answer true if the receiver is a multi-bytecode instruction (such as aload0_putfield_super); otherwise, it will answer false. 402 * 403 * @return boolean true if multibytecode, false otherwise 404 */ 405 public boolean hasMultipleByteCodes() { 406 // Currently, all multi-bytecode instructions 407 // begin with aload_0, so this is how we test. 408 if (rewrite.length > 1 && rewrite[0] == 42) { 409 // If there's an instruction (not a negative 410 // number, which is an operand) after the 411 // aload_0, it's a multibytecode instruction. 412 return rewrite[1] > 0; 413 } 414 return false; 415 } 416 417 public boolean hasNoOperand() { 418 return false; 419 } 420 421 public boolean nestedMustStartClassPool() { 422 return false; 423 } 424 425 public int operandLength() { 426 return operandLength; 427 } 428 429 /** 430 * When passed a byteCode, an OperandTable and a SegmentConstantPool, this method will set the rewrite of the byteCode appropriately. 431 * 432 * @param byteCode ByteCode to be updated (!) 433 * @param operandManager OperandTable from which to draw info 434 * @param codeLength Length of bytes (excluding this bytecode) from the beginning of the method. Used in calculating padding for some variable-length 435 * bytecodes (such as lookupswitch, tableswitch). 436 */ 437 public abstract void setByteCodeOperands(ByteCode byteCode, OperandManager operandManager, int codeLength); 438 439 @Override 440 public String toString() { 441 return this.getClass().getName() + "(" + getName() + ")"; 442 } 443}