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1
32
33 package com.jeantessier.classreader;
34
35 import java.util.*;
36
37 public class Instruction {
38 private static String  [] opcode = new String [256];
39 private static int[] length = new int[256];
40
41 static {
42 opcode[0x00] = "nop";
43 length[0x00] = 1;
44 opcode[0x01] = "aconst_null";
45 length[0x01] = 1;
46 opcode[0x02] = "iconst_m1";
47 length[0x02] = 1;
48 opcode[0x03] = "iconst_0";
49 length[0x03] = 1;
50 opcode[0x04] = "iconst_1";
51 length[0x04] = 1;
52 opcode[0x05] = "iconst_2";
53 length[0x05] = 1;
54 opcode[0x06] = "iconst_3";
55 length[0x06] = 1;
56 opcode[0x07] = "iconst_4";
57 length[0x07] = 1;
58 opcode[0x08] = "iconst_5";
59 length[0x08] = 1;
60 opcode[0x09] = "lconst_0";
61 length[0x09] = 1;
62 opcode[0x0a] = "lconst_1";
63 length[0x0a] = 1;
64 opcode[0x0b] = "fconst_0";
65 length[0x0b] = 1;
66 opcode[0x0c] = "fconst_1";
67 length[0x0c] = 1;
68 opcode[0x0d] = "fconst_2";
69 length[0x0d] = 1;
70 opcode[0x0e] = "dconst_0";
71 length[0x0e] = 1;
72 opcode[0x0f] = "dconst_1";
73 length[0x0f] = 1;
74
75 opcode[0x10] = "bipush";
76 length[0x10] = 2;
77 opcode[0x11] = "sipush";
78 length[0x11] = 3;
79 opcode[0x12] = "ldc";
80 length[0x12] = 2;
81 opcode[0x13] = "ldc_w";
82 length[0x13] = 3;
83 opcode[0x14] = "ldc2_w";
84 length[0x14] = 3;
85 opcode[0x15] = "iload";
86 length[0x15] = 2;
87 opcode[0x16] = "lload";
88 length[0x16] = 2;
89 opcode[0x17] = "fload";
90 length[0x17] = 2;
91 opcode[0x18] = "dload";
92 length[0x18] = 2;
93 opcode[0x19] = "aload";
94 length[0x19] = 2;
95 opcode[0x1a] = "iload_0";
96 length[0x1a] = 1;
97 opcode[0x1b] = "iload_1";
98 length[0x1b] = 1;
99 opcode[0x1c] = "iload_2";
100 length[0x1c] = 1;
101 opcode[0x1d] = "iload_3";
102 length[0x1d] = 1;
103 opcode[0x1e] = "lload_0";
104 length[0x1e] = 1;
105 opcode[0x1f] = "lload_1";
106 length[0x1f] = 1;
107
108 opcode[0x20] = "lload_2";
109 length[0x20] = 1;
110 opcode[0x21] = "lload_3";
111 length[0x21] = 1;
112 opcode[0x22] = "fload_0";
113 length[0x22] = 1;
114 opcode[0x23] = "fload_1";
115 length[0x23] = 1;
116 opcode[0x24] = "fload_2";
117 length[0x24] = 1;
118 opcode[0x25] = "fload_3";
119 length[0x25] = 1;
120 opcode[0x26] = "dload_0";
121 length[0x26] = 1;
122 opcode[0x27] = "dload_1";
123 length[0x27] = 1;
124 opcode[0x28] = "dload_2";
125 length[0x28] = 1;
126 opcode[0x29] = "dload_3";
127 length[0x29] = 1;
128 opcode[0x2a] = "aload_0";
129 length[0x2a] = 1;
130 opcode[0x2b] = "aload_1";
131 length[0x2b] = 1;
132 opcode[0x2c] = "aload_2";
133 length[0x2c] = 1;
134 opcode[0x2d] = "aload_3";
135 length[0x2d] = 1;
136 opcode[0x2e] = "iaload";
137 length[0x2e] = 1;
138 opcode[0x2f] = "laload";
139 length[0x2f] = 1;
140
141 opcode[0x30] = "faload";
142 length[0x30] = 1;
143 opcode[0x31] = "daload";
144 length[0x31] = 1;
145 opcode[0x32] = "aaload";
146 length[0x32] = 1;
147 opcode[0x33] = "baload";
148 length[0x33] = 1;
149 opcode[0x34] = "caload";
150 length[0x34] = 1;
151 opcode[0x35] = "saload";
152 length[0x35] = 1;
153 opcode[0x36] = "istore";
154 length[0x36] = 2;
155 opcode[0x37] = "lstore";
156 length[0x37] = 2;
157 opcode[0x38] = "fstore";
158 length[0x38] = 2;
159 opcode[0x39] = "dstore";
160 length[0x39] = 2;
161 opcode[0x3a] = "astore";
162 length[0x3a] = 2;
163 opcode[0x3b] = "istore_0";
164 length[0x3b] = 1;
165 opcode[0x3c] = "istore_1";
166 length[0x3c] = 1;
167 opcode[0x3d] = "istore_2";
168 length[0x3d] = 1;
169 opcode[0x3e] = "istore_3";
170 length[0x3e] = 1;
171 opcode[0x3f] = "lstore_0";
172 length[0x3f] = 1;
173
174 opcode[0x40] = "lstore_1";
175 length[0x40] = 1;
176 opcode[0x41] = "lstore_2";
177 length[0x41] = 1;
178 opcode[0x42] = "lstore_3";
179 length[0x42] = 1;
180 opcode[0x43] = "fstore_0";
181 length[0x43] = 1;
182 opcode[0x44] = "fstore_1";
183 length[0x44] = 1;
184 opcode[0x45] = "fstore_2";
185 length[0x45] = 1;
186 opcode[0x46] = "fstore_3";
187 length[0x46] = 1;
188 opcode[0x47] = "dstore_0";
189 length[0x47] = 1;
190 opcode[0x48] = "dstore_1";
191 length[0x48] = 1;
192 opcode[0x49] = "dstore_2";
193 length[0x49] = 1;
194 opcode[0x4a] = "dstore_3";
195 length[0x4a] = 1;
196 opcode[0x4b] = "astore_0";
197 length[0x4b] = 1;
198 opcode[0x4c] = "astore_1";
199 length[0x4c] = 1;
200 opcode[0x4d] = "astore_2";
201 length[0x4d] = 1;
202 opcode[0x4e] = "astore_3";
203 length[0x4e] = 1;
204 opcode[0x4f] = "iastore";
205 length[0x4f] = 1;
206
207 opcode[0x50] = "lastore";
208 length[0x50] = 1;
209 opcode[0x51] = "fastore";
210 length[0x51] = 1;
211 opcode[0x52] = "dastore";
212 length[0x52] = 1;
213 opcode[0x53] = "aastore";
214 length[0x53] = 1;
215 opcode[0x54] = "bastore";
216 length[0x54] = 1;
217 opcode[0x55] = "castore";
218 length[0x55] = 1;
219 opcode[0x56] = "sastore";
220 length[0x56] = 1;
221 opcode[0x57] = "pop";
222 length[0x57] = 1;
223 opcode[0x58] = "pop2";
224 length[0x58] = 1;
225 opcode[0x59] = "dup";
226 length[0x59] = 1;
227 opcode[0x5a] = "dup_x1";
228 length[0x5a] = 1;
229 opcode[0x5b] = "dub_x2";
230 length[0x5b] = 1;
231 opcode[0x5c] = "dup2";
232 length[0x5c] = 1;
233 opcode[0x5d] = "dup2_x1";
234 length[0x5d] = 1;
235 opcode[0x5e] = "dup2_x2";
236 length[0x5e] = 1;
237 opcode[0x5f] = "swap";
238 length[0x5f] = 1;
239
240 opcode[0x60] = "iadd";
241 length[0x60] = 1;
242 opcode[0x61] = "ladd";
243 length[0x61] = 1;
244 opcode[0x62] = "fadd";
245 length[0x62] = 1;
246 opcode[0x63] = "dadd";
247 length[0x63] = 1;
248 opcode[0x64] = "isub";
249 length[0x64] = 1;
250 opcode[0x65] = "lsub";
251 length[0x65] = 1;
252 opcode[0x66] = "fsub";
253 length[0x66] = 1;
254 opcode[0x67] = "dsub";
255 length[0x67] = 1;
256 opcode[0x68] = "imul";
257 length[0x68] = 1;
258 opcode[0x69] = "lmul";
259 length[0x69] = 1;
260 opcode[0x6a] = "fmul";
261 length[0x6a] = 1;
262 opcode[0x6b] = "dmul";
263 length[0x6b] = 1;
264 opcode[0x6c] = "idiv";
265 length[0x6c] = 1;
266 opcode[0x6d] = "ldiv";
267 length[0x6d] = 1;
268 opcode[0x6e] = "fdiv";
269 length[0x6e] = 1;
270 opcode[0x6f] = "ddiv";
271 length[0x6f] = 1;
272
273 opcode[0x70] = "irem";
274 length[0x70] = 1;
275 opcode[0x71] = "lrem";
276 length[0x71] = 1;
277 opcode[0x72] = "frem";
278 length[0x72] = 1;
279 opcode[0x73] = "drem";
280 length[0x73] = 1;
281 opcode[0x74] = "ineg";
282 length[0x74] = 1;
283 opcode[0x75] = "lneg";
284 length[0x75] = 1;
285 opcode[0x76] = "fneg";
286 length[0x76] = 1;
287 opcode[0x77] = "dneg";
288 length[0x77] = 1;
289 opcode[0x78] = "ishl";
290 length[0x78] = 1;
291 opcode[0x79] = "lshl";
292 length[0x79] = 1;
293 opcode[0x7a] = "ishr";
294 length[0x7a] = 1;
295 opcode[0x7b] = "lshr";
296 length[0x7b] = 1;
297 opcode[0x7c] = "iushr";
298 length[0x7c] = 1;
299 opcode[0x7d] = "lushr";
300 length[0x7d] = 1;
301 opcode[0x7e] = "iand";
302 length[0x7e] = 1;
303 opcode[0x7f] = "land";
304 length[0x7f] = 1;
305
306 opcode[0x80] = "ior";
307 length[0x80] = 1;
308 opcode[0x81] = "lor";
309 length[0x81] = 1;
310 opcode[0x82] = "ixor";
311 length[0x82] = 1;
312 opcode[0x83] = "lxor";
313 length[0x83] = 1;
314 opcode[0x84] = "iinc";
315 length[0x84] = 3;
316 opcode[0x85] = "i2l";
317 length[0x85] = 1;
318 opcode[0x86] = "i2f";
319 length[0x86] = 1;
320 opcode[0x87] = "i2d";
321 length[0x87] = 1;
322 opcode[0x88] = "l2i";
323 length[0x88] = 1;
324 opcode[0x89] = "l2f";
325 length[0x89] = 1;
326 opcode[0x8a] = "l2d";
327 length[0x8a] = 1;
328 opcode[0x8b] = "f2i";
329 length[0x8b] = 1;
330 opcode[0x8c] = "f2l";
331 length[0x8c] = 1;
332 opcode[0x8d] = "f2d";
333 length[0x8d] = 1;
334 opcode[0x8e] = "d2i";
335 length[0x8e] = 1;
336 opcode[0x8f] = "d2l";
337 length[0x8f] = 1;
338
339 opcode[0x90] = "d2f";
340 length[0x90] = 1;
341 opcode[0x91] = "i2b";
342 length[0x91] = 1;
343 opcode[0x92] = "i2c";
344 length[0x92] = 1;
345 opcode[0x93] = "i2s";
346 length[0x93] = 1;
347 opcode[0x94] = "lcmp";
348 length[0x94] = 1;
349 opcode[0x95] = "fcmpl";
350 length[0x95] = 1;
351 opcode[0x96] = "fcmpg";
352 length[0x96] = 1;
353 opcode[0x97] = "dcmpl";
354 length[0x97] = 1;
355 opcode[0x98] = "dcmpg";
356 length[0x98] = 1;
357 opcode[0x99] = "ifeq";
358 length[0x99] = 3;
359 opcode[0x9a] = "ifne";
360 length[0x9a] = 3;
361 opcode[0x9b] = "iflt";
362 length[0x9b] = 3;
363 opcode[0x9c] = "ifge";
364 length[0x9c] = 3;
365 opcode[0x9d] = "ifgt";
366 length[0x9d] = 3;
367 opcode[0x9e] = "ifle";
368 length[0x9e] = 3;
369 opcode[0x9f] = "if_icmpeq";
370 length[0x9f] = 3;
371
372 opcode[0xa0] = "if_icmpne";
373 length[0xa0] = 3;
374 opcode[0xa1] = "if_icmplt";
375 length[0xa1] = 3;
376 opcode[0xa2] = "if_icmpge";
377 length[0xa2] = 3;
378 opcode[0xa3] = "if_icmpgt";
379 length[0xa3] = 3;
380 opcode[0xa4] = "if_icmple";
381 length[0xa4] = 3;
382 opcode[0xa5] = "if_acmpeq";
383 length[0xa5] = 3;
384 opcode[0xa6] = "if_acmpne";
385 length[0xa6] = 3;
386 opcode[0xa7] = "goto";
387 length[0xa7] = 3;
388 opcode[0xa8] = "jsr";
389 length[0xa8] = 3;
390 opcode[0xa9] = "ret";
391 length[0xa9] = 2;
392 opcode[0xaa] = "tableswitch";
393 length[0xaa] = -1;
394 opcode[0xab] = "lookupswitch";
395 length[0xab] = -1;
396 opcode[0xac] = "ireturn";
397 length[0xac] = 1;
398 opcode[0xad] = "lreturn";
399 length[0xad] = 1;
400 opcode[0xae] = "freturn";
401 length[0xae] = 1;
402 opcode[0xaf] = "dreturn";
403 length[0xaf] = 1;
404
405 opcode[0xb0] = "areturn";
406 length[0xb0] = 1;
407 opcode[0xb1] = "return";
408 length[0xb1] = 1;
409 opcode[0xb2] = "getstatic";
410 length[0xb2] = 3;
411 opcode[0xb3] = "putstatic";
412 length[0xb3] = 3;
413 opcode[0xb4] = "getfield";
414 length[0xb4] = 3;
415 opcode[0xb5] = "putfield";
416 length[0xb5] = 3;
417 opcode[0xb6] = "invokevirtual";
418 length[0xb6] = 3;
419 opcode[0xb7] = "invokespecial";
420 length[0xb7] = 3;
421 opcode[0xb8] = "invokestatic";
422 length[0xb8] = 3;
423 opcode[0xb9] = "invokeinterface";
424 length[0xb9] = 5;
425 opcode[0xba] = "xxxunusedxxx";
426 length[0xba] = 1;
427 opcode[0xbb] = "new";
428 length[0xbb] = 3;
429 opcode[0xbc] = "newarray";
430 length[0xbc] = 2;
431 opcode[0xbd] = "anewarray";
432 length[0xbd] = 3;
433 opcode[0xbe] = "arraylength";
434 length[0xbe] = 1;
435 opcode[0xbf] = "athrow";
436 length[0xbf] = 1;
437
438 opcode[0xc0] = "checkcast";
439 length[0xc0] = 3;
440 opcode[0xc1] = "instanceof";
441 length[0xc1] = 3;
442 opcode[0xc2] = "monitorenter";
443 length[0xc2] = 1;
444 opcode[0xc3] = "monitorexit";
445 length[0xc3] = 1;
446 opcode[0xc4] = "wide";
447 length[0xc4] = -1;
448 opcode[0xc5] = "multianewarray";
449 length[0xc5] = 4;
450 opcode[0xc6] = "ifnull";
451 length[0xc6] = 3;
452 opcode[0xc7] = "ifnonnull";
453 length[0xc7] = 3;
454 opcode[0xc8] = "goto_w";
455 length[0xc8] = 5;
456 opcode[0xc9] = "jsr_w";
457 length[0xc9] = 5;
458 opcode[0xca] = "wide";
459 length[0xca] = 1;
460 opcode[0xcb] = "xxxundefinedxxx";
461 length[0xcb] = 1;
462 opcode[0xcc] = "xxxundefinedxxx";
463 length[0xcc] = 1;
464 opcode[0xcd] = "xxxundefinedxxx";
465 length[0xcd] = 1;
466 opcode[0xce] = "xxxundefinedxxx";
467 length[0xce] = 1;
468 opcode[0xcf] = "xxxundefinedxxx";
469 length[0xcf] = 1;
470
471 opcode[0xd0] = "xxxundefinedxxx";
472 length[0xd0] = 1;
473 opcode[0xd1] = "xxxundefinedxxx";
474 length[0xd1] = 1;
475 opcode[0xd2] = "xxxundefinedxxx";
476 length[0xd2] = 1;
477 opcode[0xd3] = "xxxundefinedxxx";
478 length[0xd3] = 1;
479 opcode[0xd4] = "xxxundefinedxxx";
480 length[0xd4] = 1;
481 opcode[0xd5] = "xxxundefinedxxx";
482 length[0xd5] = 1;
483 opcode[0xd6] = "xxxundefinedxxx";
484 length[0xd6] = 1;
485 opcode[0xd7] = "xxxundefinedxxx";
486 length[0xd7] = 1;
487 opcode[0xd8] = "xxxundefinedxxx";
488 length[0xd8] = 1;
489 opcode[0xd9] = "xxxundefinedxxx";
490 length[0xd9] = 1;
491 opcode[0xda] = "xxxundefinedxxx";
492 length[0xda] = 1;
493 opcode[0xdb] = "xxxundefinedxxx";
494 length[0xdb] = 1;
495 opcode[0xdc] = "xxxundefinedxxx";
496 length[0xdc] = 1;
497 opcode[0xdd] = "xxxundefinedxxx";
498 length[0xdd] = 1;
499 opcode[0xde] = "xxxundefinedxxx";
500 length[0xde] = 1;
501 opcode[0xdf] = "xxxundefinedxxx";
502 length[0xdf] = 1;
503
504 opcode[0xe0] = "xxxundefinedxxx";
505 length[0xe0] = 1;
506 opcode[0xe1] = "xxxundefinedxxx";
507 length[0xe1] = 1;
508 opcode[0xe2] = "xxxundefinedxxx";
509 length[0xe2] = 1;
510 opcode[0xe3] = "xxxundefinedxxx";
511 length[0xe3] = 1;
512 opcode[0xe4] = "xxxundefinedxxx";
513 length[0xe4] = 1;
514 opcode[0xe5] = "xxxundefinedxxx";
515 length[0xe5] = 1;
516 opcode[0xe6] = "xxxundefinedxxx";
517 length[0xe6] = 1;
518 opcode[0xe7] = "xxxundefinedxxx";
519 length[0xe7] = 1;
520 opcode[0xe8] = "xxxundefinedxxx";
521 length[0xe8] = 1;
522 opcode[0xe9] = "xxxundefinedxxx";
523 length[0xe9] = 1;
524 opcode[0xea] = "xxxundefinedxxx";
525 length[0xea] = 1;
526 opcode[0xeb] = "xxxundefinedxxx";
527 length[0xeb] = 1;
528 opcode[0xec] = "xxxundefinedxxx";
529 length[0xec] = 1;
530 opcode[0xed] = "xxxundefinedxxx";
531 length[0xed] = 1;
532 opcode[0xee] = "xxxundefinedxxx";
533 length[0xee] = 1;
534 opcode[0xef] = "xxxundefinedxxx";
535 length[0xef] = 1;
536
537 opcode[0xf0] = "xxxundefinedxxx";
538 length[0xf0] = 1;
539 opcode[0xf1] = "xxxundefinedxxx";
540 length[0xf1] = 1;
541 opcode[0xf2] = "xxxundefinedxxx";
542 length[0xf2] = 1;
543 opcode[0xf3] = "xxxundefinedxxx";
544 length[0xf3] = 1;
545 opcode[0xf4] = "xxxundefinedxxx";
546 length[0xf4] = 1;
547 opcode[0xf5] = "xxxundefinedxxx";
548 length[0xf5] = 1;
549 opcode[0xf6] = "xxxundefinedxxx";
550 length[0xf6] = 1;
551 opcode[0xf7] = "xxxundefinedxxx";
552 length[0xf7] = 1;
553 opcode[0xf8] = "xxxundefinedxxx";
554 length[0xf8] = 1;
555 opcode[0xf9] = "xxxundefinedxxx";
556 length[0xf9] = 1;
557 opcode[0xfa] = "xxxundefinedxxx";
558 length[0xfa] = 1;
559 opcode[0xfb] = "xxxundefinedxxx";
560 length[0xfb] = 1;
561 opcode[0xfc] = "xxxundefinedxxx";
562 length[0xfc] = 1;
563 opcode[0xfd] = "xxxundefinedxxx";
564 length[0xfd] = 1;
565 opcode[0xfe] = "impdep1";
566 length[0xfe] = 1;
567 opcode[0xff] = "impdep2";
568 length[0xff] = 1;
569 }
570
571 private byte[] code;
572 private int start;
573
574 public Instruction(byte[] code, int start) {
575 this.code = code;
576 this.start = start;
577 }
578
579 public byte[] getCode() {
580 return code;
581 }
582
583 public int getStart() {
584 return start;
585 }
586
587 public int getOpcode() {
588 return (code[start] & 0xff);
589 }
590
591 public static String getMnemonic(int instruction) {
592 return opcode[instruction];
593 }
594
595 public String getMnemonic() {
596 String result = getMnemonic(getOpcode());
597
598 if (getOpcode() == 0xc4 ) {
599 result += " " + getMnemonic(code[start+1] & 0xff);
600 }
601
602 return result;
603 }
604
605 public int getLength() {
606 int result = length[getOpcode()];
607
608 int padding, low, high, npairs;
609
610 switch (getOpcode()) {
611 case 0xaa:
612 padding = 3 - (start % 4);
614 low =
615 ((code[start+padding+5] & 0xff) << 24) |
616 ((code[start+padding+6] & 0xff) << 16) |
617 ((code[start+padding+7] & 0xff) << 8) |
618 ((code[start+padding+8] & 0xff));
619 high =
620 ((code[start+padding+9] & 0xff) << 24) |
621 ((code[start+padding+10] & 0xff) << 16) |
622 ((code[start+padding+11] & 0xff) << 8) |
623 ((code[start+padding+12] & 0xff));
624 result =
625 1 + padding + 12 + (high - low + 1) * 4; break;
630
631 case 0xab:
632 padding = 3 - (start % 4);
634 npairs =
635 ((code[start+padding+5] & 0xff) << 24) |
636 ((code[start+padding+6] & 0xff) << 16) |
637 ((code[start+padding+7] & 0xff) << 8) |
638 ((code[start+padding+8] & 0xff));
639 result =
640 1 + padding + 8 + (npairs * 8); break;
645
646 case 0xc4:
647 if ((code[start+1] & 0xff) == 0x84 ) {
649 result = 6;
650 } else {
651 result = 4;
652 }
653 break;
654
655 default:
656 break;
658 }
659
660 return result;
661 }
662
663 public String toString() {
664 return getMnemonic();
665 }
666 }
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Java API By Example, From Geeks To Geeks.