J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. 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. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * An extension of BinaryCode that allows code to be printed. |
| 26 | * Includes printing of disassembled byte codes, exception info, |
| 27 | * local variable and line number info. |
| 28 | * |
| 29 | */ |
| 30 | |
| 31 | package ilib; |
| 32 | |
| 33 | import java.io.ByteArrayInputStream; |
| 34 | import java.io.CharArrayWriter; |
| 35 | import java.io.DataInputStream; |
| 36 | import java.io.IOException; |
| 37 | import java.io.PrintWriter; |
| 38 | import java.io.PrintStream; |
| 39 | import java.util.Map; |
| 40 | import java.util.HashMap; |
| 41 | |
| 42 | class InjectBytecodes implements RuntimeConstants { |
| 43 | |
| 44 | private final ClassReaderWriter c; |
| 45 | private final PrintStream output; |
| 46 | private final int length; |
| 47 | private final int[] map; |
| 48 | private final byte[] widening; |
| 49 | private final Injector[] before = new Injector[256]; |
| 50 | private final Injector[] after = new Injector[256]; |
| 51 | private final String className; |
| 52 | private final String methodName; |
| 53 | private final Map<Integer,byte[]> snippets = new HashMap<Integer,byte[]>(); |
| 54 | |
| 55 | private int pos; |
| 56 | private int newPos; |
| 57 | |
| 58 | private class Span { |
| 59 | final int delta; |
| 60 | final int target; |
| 61 | final int newDelta; |
| 62 | final int newTarget; |
| 63 | |
| 64 | Span(int delta) { |
| 65 | this.delta = delta; |
| 66 | this.target = pos + delta; |
| 67 | this.newTarget = map[target]; |
| 68 | this.newDelta = newTarget - newPos; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Constructor |
| 74 | */ |
| 75 | InjectBytecodes(ClassReaderWriter c, int length, |
| 76 | String className, String methodName) { |
| 77 | this.c = c; |
| 78 | this.output = System.out; |
| 79 | this.length = length; |
| 80 | this.map = new int[length + 1]; |
| 81 | this.widening = new byte[length + 1]; |
| 82 | this.className = className; |
| 83 | this.methodName = methodName; |
| 84 | c.markLocalPositionStart(); |
| 85 | for (int i = 0; i <= length; ++i) { |
| 86 | map[i] = i; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | public void inject(int at, byte[] newCode) { |
| 91 | snippets.put(new Integer(at), newCode); |
| 92 | trace("external "); |
| 93 | inject(at, newCode.length); |
| 94 | } |
| 95 | |
| 96 | private void inject(int at, int len) { |
| 97 | if (Inject.verbose) { |
| 98 | traceln("Injecting " + len + " at " + at); |
| 99 | } |
| 100 | for (int i = at; i <= length; ++i) { |
| 101 | map[i] += len; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | private void widen(int at, int len) { |
| 106 | int delta = len - widening[at]; |
| 107 | if (Inject.verbose) { |
| 108 | traceln(); |
| 109 | traceln("Widening to " + len + " at " + at); |
| 110 | } |
| 111 | inject(c.localPosition(), delta); // inject at end of instruction |
| 112 | widening[at] = (byte)len; // mark at beginning of instruction |
| 113 | } |
| 114 | |
| 115 | public void injectBefore(int code, Injector inj) { |
| 116 | before[code] = inj; |
| 117 | } |
| 118 | |
| 119 | public void injectAfter(int code, Injector inj) { |
| 120 | after[code] = inj; |
| 121 | } |
| 122 | |
| 123 | private void trace(String str) { |
| 124 | if (Inject.verbose) { |
| 125 | output.print(str); |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | private void traceln(String str) { |
| 130 | if (Inject.verbose) { |
| 131 | output.println(str); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | private void traceln() { |
| 136 | if (Inject.verbose) { |
| 137 | output.println(); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | private void trace(int i) { |
| 142 | if (Inject.verbose) { |
| 143 | output.print(i); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Print an integer so that it takes 'length' characters in |
| 149 | * the output. Temporary until formatting code is stable. |
| 150 | */ |
| 151 | private void traceFixedWidthInt(int x, int length) { |
| 152 | if (Inject.verbose) { |
| 153 | CharArrayWriter baStream = new CharArrayWriter(); |
| 154 | PrintWriter pStream = new PrintWriter(baStream); |
| 155 | pStream.print(x); |
| 156 | String str = baStream.toString(); |
| 157 | for (int cnt = length - str.length(); cnt > 0; --cnt) |
| 158 | trace(" "); |
| 159 | trace(str); |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | void adjustOffsets() throws IOException { |
| 164 | if (Inject.verbose) { |
| 165 | traceln(); |
| 166 | traceln("Method " + methodName); |
| 167 | traceln(); |
| 168 | } |
| 169 | c.rewind(); |
| 170 | while (c.localPosition() < length) { |
| 171 | insertAtInstruction(); |
| 172 | } |
| 173 | trace("Searching for adjustments..."); |
| 174 | c.rewind(); |
| 175 | while (c.localPosition() < length) { |
| 176 | if (!adjustInstruction()) { |
| 177 | c.rewind(); |
| 178 | traceln(); |
| 179 | traceln("Restarting adjustments after change..."); |
| 180 | } |
| 181 | } |
| 182 | // write the new bytecodes |
| 183 | traceln(); |
| 184 | traceln(); |
| 185 | trace("Writing new code..."); |
| 186 | c.rewind(); |
| 187 | while (c.localPosition() < length) { |
| 188 | writeInstruction(); |
| 189 | } |
| 190 | if (!snippets.isEmpty()) { |
| 191 | throw new Error("not all snippets written"); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * Walk one instruction inserting instrumentation at specified instructions |
| 197 | */ |
| 198 | private void insertAtInstruction() throws IOException { |
| 199 | pos = c.localPosition(); |
| 200 | int opcode = c.readU1(); |
| 201 | if (opcode == opc_wide) { |
| 202 | // no support for instrumenting wide instructions |
| 203 | int wopcode = c.readU1(); |
| 204 | int lvIndex = c.readU2(); |
| 205 | switch (wopcode) { |
| 206 | case opc_aload: case opc_astore: |
| 207 | case opc_fload: case opc_fstore: |
| 208 | case opc_iload: case opc_istore: |
| 209 | case opc_lload: case opc_lstore: |
| 210 | case opc_dload: case opc_dstore: |
| 211 | case opc_ret: |
| 212 | break; |
| 213 | |
| 214 | case opc_iinc: |
| 215 | c.readS2(); |
| 216 | break; |
| 217 | default: |
| 218 | throw new Error("Invalid wide opcode: " + wopcode); |
| 219 | } |
| 220 | } else { |
| 221 | Injector inj; |
| 222 | |
| 223 | inj = before[opcode]; |
| 224 | if (inj != null) { |
| 225 | inject(pos, inj.bytecodes(className, methodName, pos)); |
| 226 | } |
| 227 | |
| 228 | switch (opcode) { |
| 229 | case opc_tableswitch:{ |
| 230 | int header = (pos+1+3) & (~3); // 4byte boundry |
| 231 | c.skip(header - (pos+1)); // skip old padding |
| 232 | |
| 233 | c.readU4(); |
| 234 | int low = c.readU4(); |
| 235 | int high = c.readU4(); |
| 236 | c.skip((high+1-low) * 4); |
| 237 | break; |
| 238 | } |
| 239 | |
| 240 | case opc_lookupswitch:{ |
| 241 | int header = (pos+1+3) & (~3); // 4byte boundry |
| 242 | c.skip(header - (pos+1)); // skip padding |
| 243 | |
| 244 | c.readU4(); |
| 245 | int npairs = c.readU4(); |
| 246 | c.skip(npairs * 8); |
| 247 | break; |
| 248 | } |
| 249 | |
| 250 | default: { |
| 251 | int instrLen = opcLengths[opcode]; |
| 252 | c.skip(instrLen-1); |
| 253 | } |
| 254 | } |
| 255 | inj = after[opcode]; |
| 256 | if (inj != null) { |
| 257 | pos = c.localPosition(); |
| 258 | inject(pos, inj.bytecodes(className, methodName, pos)); |
| 259 | } |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * Walk one instruction adjusting for insertions |
| 265 | */ |
| 266 | private boolean adjustInstruction() throws IOException { |
| 267 | pos = c.localPosition(); |
| 268 | newPos = map[pos]; |
| 269 | int opcode = c.readU1(); |
| 270 | if (Inject.verbose) { |
| 271 | traceln(); |
| 272 | traceFixedWidthInt(pos, 4); |
| 273 | traceFixedWidthInt(newPos, 4); |
| 274 | trace(" "); |
| 275 | } |
| 276 | if (opcode == opc_wide) { |
| 277 | int wopcode = c.readU1(); |
| 278 | int lvIndex = c.readU2(); |
| 279 | if (Inject.verbose) { |
| 280 | trace(opcNames[wopcode] + "_w "); |
| 281 | } |
| 282 | switch (wopcode) { |
| 283 | case opc_aload: case opc_astore: |
| 284 | case opc_fload: case opc_fstore: |
| 285 | case opc_iload: case opc_istore: |
| 286 | case opc_lload: case opc_lstore: |
| 287 | case opc_dload: case opc_dstore: |
| 288 | case opc_ret: |
| 289 | trace(lvIndex); |
| 290 | break; |
| 291 | |
| 292 | case opc_iinc: |
| 293 | int constVal = c.readS2(); |
| 294 | if (Inject.verbose) { |
| 295 | trace(lvIndex + " " + constVal); |
| 296 | } |
| 297 | break; |
| 298 | default: |
| 299 | throw new Error("Invalid wide opcode: " + wopcode); |
| 300 | } |
| 301 | } else { |
| 302 | if (Inject.verbose) { |
| 303 | trace(opcNames[opcode]); |
| 304 | } |
| 305 | switch (opcode) { |
| 306 | |
| 307 | case opc_tableswitch:{ |
| 308 | int widened = widening[pos]; |
| 309 | int header = (pos+1+3) & (~3); // 4byte boundry |
| 310 | int newHeader = (newPos+1+3) & (~3); // 4byte boundry |
| 311 | |
| 312 | c.skip(header - (pos+1)); // skip old padding |
| 313 | |
| 314 | Span defaultSkip = new Span(c.readU4()); |
| 315 | int low = c.readU4(); |
| 316 | int high = c.readU4(); |
| 317 | if (Inject.verbose) { |
| 318 | trace(" " + low + " to " + high); |
| 319 | trace(": default= [was] " + defaultSkip.target); |
| 320 | trace(" [now] " + defaultSkip.newTarget); |
| 321 | for (int i = low; i <= high; ++i) { |
| 322 | Span jump = new Span(c.readU4()); |
| 323 | traceln(""); |
| 324 | trace('\t'); |
| 325 | traceFixedWidthInt(i, 5); |
| 326 | trace(": " + jump.newTarget); |
| 327 | } |
| 328 | } else { |
| 329 | c.skip((high+1-low) * 4); |
| 330 | } |
| 331 | int newPadding = newHeader - newPos; |
| 332 | int oldPadding = header - pos; |
| 333 | int deltaPadding = newPadding - oldPadding; |
| 334 | if (widened != deltaPadding) { |
| 335 | widen(pos, deltaPadding); |
| 336 | return false; // cause restart |
| 337 | } |
| 338 | break; |
| 339 | } |
| 340 | |
| 341 | case opc_lookupswitch:{ |
| 342 | int widened = widening[pos]; |
| 343 | int header = (pos+1+3) & (~3); // 4byte boundry |
| 344 | int newHeader = (newPos+1+3) & (~3); // 4byte boundry |
| 345 | |
| 346 | c.skip(header - (pos+1)); // skip old padding |
| 347 | |
| 348 | Span defaultSkip = new Span(c.readU4()); |
| 349 | int npairs = c.readU4(); |
| 350 | if (Inject.verbose) { |
| 351 | trace(" npairs: " + npairs); |
| 352 | trace(": default= [was] " + defaultSkip.target); |
| 353 | trace(" [now] " + defaultSkip.newTarget); |
| 354 | for (int i = 0; i< npairs; ++i) { |
| 355 | int match = c.readU4(); |
| 356 | Span jump = new Span(c.readU4()); |
| 357 | traceln(""); |
| 358 | trace('\t'); |
| 359 | traceFixedWidthInt(match, 5); |
| 360 | trace(": " + jump.newTarget); |
| 361 | } |
| 362 | } else { |
| 363 | c.skip(npairs * 8); |
| 364 | } |
| 365 | int newPadding = newHeader - newPos; |
| 366 | int oldPadding = header - pos; |
| 367 | int deltaPadding = newPadding - oldPadding; |
| 368 | if (widened != deltaPadding) { |
| 369 | widen(pos, deltaPadding); |
| 370 | return false; // cause restart |
| 371 | } |
| 372 | break; |
| 373 | } |
| 374 | |
| 375 | case opc_jsr: case opc_goto: |
| 376 | case opc_ifeq: case opc_ifge: case opc_ifgt: |
| 377 | case opc_ifle: case opc_iflt: case opc_ifne: |
| 378 | case opc_if_icmpeq: case opc_if_icmpne: case opc_if_icmpge: |
| 379 | case opc_if_icmpgt: case opc_if_icmple: case opc_if_icmplt: |
| 380 | case opc_if_acmpeq: case opc_if_acmpne: |
| 381 | case opc_ifnull: case opc_ifnonnull: { |
| 382 | int widened = widening[pos]; |
| 383 | Span jump = new Span(c.readS2()); |
| 384 | if (widened == 0) { // not yet widened |
| 385 | int newDelta = jump.newDelta; |
| 386 | if ((newDelta < -32768) || (newDelta > 32767)) { |
| 387 | switch (opcode) { |
| 388 | case opc_jsr: case opc_goto: |
| 389 | widen(pos, 2); // will convert to wide |
| 390 | break; |
| 391 | default: |
| 392 | widen(pos, 5); // will inject goto_w |
| 393 | break; |
| 394 | } |
| 395 | return false; // cause restart |
| 396 | } |
| 397 | } |
| 398 | if (Inject.verbose) { |
| 399 | trace(" [was] " + jump.target + " ==> " + |
| 400 | " [now] " + jump.newTarget); |
| 401 | } |
| 402 | break; |
| 403 | } |
| 404 | |
| 405 | case opc_jsr_w: |
| 406 | case opc_goto_w: { |
| 407 | Span jump = new Span(c.readU4()); |
| 408 | if (Inject.verbose) { |
| 409 | trace(" [was] " + jump.target + |
| 410 | " [now] " + jump.newTarget); |
| 411 | } |
| 412 | break; |
| 413 | } |
| 414 | |
| 415 | default: { |
| 416 | int instrLen = opcLengths[opcode]; |
| 417 | c.skip(instrLen-1); |
| 418 | break; |
| 419 | } |
| 420 | } |
| 421 | } |
| 422 | return true; // successful return |
| 423 | } |
| 424 | |
| 425 | |
| 426 | /** |
| 427 | * Walk one instruction writing the transformed instruction. |
| 428 | */ |
| 429 | private void writeInstruction() throws IOException { |
| 430 | pos = c.localPosition(); |
| 431 | newPos = map[pos]; |
| 432 | byte[] newCode = snippets.remove(new Integer(pos)); |
| 433 | if (newCode != null) { |
| 434 | traceln(); |
| 435 | traceFixedWidthInt(pos, 4); |
| 436 | trace(" ... -- Inserting new code"); |
| 437 | c.writeBytes(newCode); |
| 438 | } |
| 439 | int opcode = c.readU1(); |
| 440 | if (Inject.verbose) { |
| 441 | traceln(); |
| 442 | traceFixedWidthInt(pos, 4); |
| 443 | traceFixedWidthInt(newPos, 4); |
| 444 | trace(" "); |
| 445 | } |
| 446 | if (opcode == opc_wide) { |
| 447 | int wopcode = c.readU1(); |
| 448 | int lvIndex = c.readU2(); |
| 449 | if (Inject.verbose) { |
| 450 | trace(opcNames[wopcode] + "_w "); |
| 451 | } |
| 452 | c.writeU1(opcode); |
| 453 | c.writeU1(wopcode); |
| 454 | c.writeU2(lvIndex); |
| 455 | switch (wopcode) { |
| 456 | case opc_aload: case opc_astore: |
| 457 | case opc_fload: case opc_fstore: |
| 458 | case opc_iload: case opc_istore: |
| 459 | case opc_lload: case opc_lstore: |
| 460 | case opc_dload: case opc_dstore: |
| 461 | case opc_ret: |
| 462 | trace(lvIndex); |
| 463 | break; |
| 464 | |
| 465 | case opc_iinc: |
| 466 | int constVal = c.readS2(); |
| 467 | c.writeU2(constVal); // ??? U vs S |
| 468 | if (Inject.verbose) { |
| 469 | trace(lvIndex + " " + constVal); |
| 470 | } |
| 471 | break; |
| 472 | default: |
| 473 | throw new Error("Invalid wide opcode: " + wopcode); |
| 474 | } |
| 475 | } else { |
| 476 | if (Inject.verbose) { |
| 477 | trace(opcNames[opcode]); |
| 478 | } |
| 479 | switch (opcode) { |
| 480 | |
| 481 | case opc_tableswitch:{ |
| 482 | int header = (pos+1+3) & (~3); // 4byte boundry |
| 483 | int newHeader = (newPos+1+3) & (~3); // 4byte boundry |
| 484 | |
| 485 | c.skip(header - (pos+1)); // skip old padding |
| 486 | |
| 487 | Span defaultSkip = new Span(c.readU4()); |
| 488 | int low = c.readU4(); |
| 489 | int high = c.readU4(); |
| 490 | |
| 491 | c.writeU1(opcode); // copy instruction |
| 492 | for (int i = newPos+1; i < newHeader; ++i) { |
| 493 | c.writeU1(0); // write new padding |
| 494 | } |
| 495 | c.writeU4(defaultSkip.newDelta); |
| 496 | c.writeU4(low); |
| 497 | c.writeU4(high); |
| 498 | |
| 499 | if (Inject.verbose) { |
| 500 | trace(" " + low + " to " + high); |
| 501 | trace(": default= [was] " + defaultSkip.target); |
| 502 | trace(" [now] " + defaultSkip.newTarget); |
| 503 | } |
| 504 | for (int i = low; i <= high; ++i) { |
| 505 | Span jump = new Span(c.readU4()); |
| 506 | c.writeU4(jump.newDelta); |
| 507 | if (Inject.verbose) { |
| 508 | traceln(""); |
| 509 | trace('\t'); |
| 510 | traceFixedWidthInt(i, 5); |
| 511 | trace(": " + jump.newTarget); |
| 512 | } |
| 513 | } |
| 514 | break; |
| 515 | } |
| 516 | |
| 517 | case opc_lookupswitch:{ |
| 518 | int header = (pos+1+3) & (~3); // 4byte boundry |
| 519 | int newHeader = (newPos+1+3) & (~3); // 4byte boundry |
| 520 | |
| 521 | c.skip(header - (pos+1)); // skip old padding |
| 522 | |
| 523 | Span defaultSkip = new Span(c.readU4()); |
| 524 | int npairs = c.readU4(); |
| 525 | if (Inject.verbose) { |
| 526 | trace(" npairs: " + npairs); |
| 527 | trace(": default= [was] " + defaultSkip.target); |
| 528 | trace(" [now] " + defaultSkip.newTarget); |
| 529 | } |
| 530 | c.writeU1(opcode); // copy instruction |
| 531 | for (int i = newPos+1; i < newHeader; ++i) { |
| 532 | c.writeU1(0); // write new padding |
| 533 | } |
| 534 | c.writeU4(defaultSkip.newDelta); |
| 535 | c.writeU4(npairs); |
| 536 | for (int i = 0; i< npairs; ++i) { |
| 537 | int match = c.readU4(); |
| 538 | Span jump = new Span(c.readU4()); |
| 539 | c.writeU4(match); |
| 540 | c.writeU4(jump.newDelta); |
| 541 | if (Inject.verbose) { |
| 542 | traceln(""); |
| 543 | trace('\t'); |
| 544 | traceFixedWidthInt(match, 5); |
| 545 | trace(": " + jump.newTarget); |
| 546 | } |
| 547 | } |
| 548 | break; |
| 549 | } |
| 550 | |
| 551 | case opc_jsr: case opc_goto: |
| 552 | case opc_ifeq: case opc_ifge: case opc_ifgt: |
| 553 | case opc_ifle: case opc_iflt: case opc_ifne: |
| 554 | case opc_if_icmpeq: case opc_if_icmpne: case opc_if_icmpge: |
| 555 | case opc_if_icmpgt: case opc_if_icmple: case opc_if_icmplt: |
| 556 | case opc_if_acmpeq: case opc_if_acmpne: |
| 557 | case opc_ifnull: case opc_ifnonnull: { |
| 558 | int widened = widening[pos]; |
| 559 | Span jump = new Span(c.readS2()); |
| 560 | int newOpcode = opcode; // default to unchanged |
| 561 | if (widened == 0) { // not widened |
| 562 | c.writeU1(opcode); // rewrite instruction |
| 563 | c.writeU2(jump.newDelta); |
| 564 | } else if (widened == 2) { // wide form |
| 565 | switch (opcode) { |
| 566 | case opc_jsr: |
| 567 | newOpcode = opc_jsr_w; |
| 568 | break; |
| 569 | case opc_goto: |
| 570 | newOpcode = opc_jsr_w; |
| 571 | break; |
| 572 | default: |
| 573 | throw new Error("unexpected opcode: " + |
| 574 | opcode); |
| 575 | } |
| 576 | c.writeU1(newOpcode); // write wide instruction |
| 577 | c.writeU4(jump.newDelta); // write new and wide delta |
| 578 | } else if (widened == 5) { // insert goto_w |
| 579 | switch (opcode) { |
| 580 | case opc_ifeq: |
| 581 | newOpcode = opc_ifne; |
| 582 | break; |
| 583 | case opc_ifge: |
| 584 | newOpcode = opc_iflt; |
| 585 | break; |
| 586 | case opc_ifgt: |
| 587 | newOpcode = opc_ifle; |
| 588 | break; |
| 589 | case opc_ifle: |
| 590 | newOpcode = opc_ifgt; |
| 591 | break; |
| 592 | case opc_iflt: |
| 593 | newOpcode = opc_ifge; |
| 594 | break; |
| 595 | case opc_ifne: |
| 596 | newOpcode = opc_ifeq; |
| 597 | break; |
| 598 | case opc_if_icmpeq: |
| 599 | newOpcode = opc_if_icmpne; |
| 600 | break; |
| 601 | case opc_if_icmpne: |
| 602 | newOpcode = opc_if_icmpeq; |
| 603 | break; |
| 604 | case opc_if_icmpge: |
| 605 | newOpcode = opc_if_icmplt; |
| 606 | break; |
| 607 | case opc_if_icmpgt: |
| 608 | newOpcode = opc_if_icmple; |
| 609 | break; |
| 610 | case opc_if_icmple: |
| 611 | newOpcode = opc_if_icmpgt; |
| 612 | break; |
| 613 | case opc_if_icmplt: |
| 614 | newOpcode = opc_if_icmpge; |
| 615 | break; |
| 616 | case opc_if_acmpeq: |
| 617 | newOpcode = opc_if_acmpne; |
| 618 | break; |
| 619 | case opc_if_acmpne: |
| 620 | newOpcode = opc_if_acmpeq; |
| 621 | break; |
| 622 | case opc_ifnull: |
| 623 | newOpcode = opc_ifnonnull; |
| 624 | break; |
| 625 | case opc_ifnonnull: |
| 626 | newOpcode = opc_ifnull; |
| 627 | break; |
| 628 | default: |
| 629 | throw new Error("unexpected opcode: " + |
| 630 | opcode); |
| 631 | } |
| 632 | c.writeU1(newOpcode); // write inverse branch |
| 633 | c.writeU2(3 + 5); // beyond if and goto_w |
| 634 | c.writeU1(opc_goto_w);// add a goto_w |
| 635 | c.writeU4(jump.newDelta); // write new and wide delta |
| 636 | } else { |
| 637 | throw new Error("unexpected widening"); |
| 638 | } |
| 639 | |
| 640 | if (Inject.verbose) { |
| 641 | trace(" [was] " + jump.target + " ==> " + |
| 642 | opcNames[newOpcode] + |
| 643 | " [now] " + jump.newTarget); |
| 644 | } |
| 645 | break; |
| 646 | } |
| 647 | |
| 648 | case opc_jsr_w: |
| 649 | case opc_goto_w: { |
| 650 | Span jump = new Span(c.readU4()); |
| 651 | c.writeU1(opcode); // instruction itself |
| 652 | c.writeU4(jump.newDelta); |
| 653 | if (Inject.verbose) { |
| 654 | trace(" [was] " + jump.target + |
| 655 | " [now] " + jump.newTarget); |
| 656 | } |
| 657 | break; |
| 658 | } |
| 659 | |
| 660 | default: { |
| 661 | int instrLen = opcLengths[opcode]; |
| 662 | c.writeU1(opcode); // instruction itself |
| 663 | c.copy(instrLen-1); |
| 664 | } |
| 665 | } |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | /** |
| 670 | * Copy the exception table for this method code |
| 671 | */ |
| 672 | void copyExceptionTable() throws IOException { |
| 673 | int tableLength = c.copyU2(); // exception table len |
| 674 | if (tableLength > 0) { |
| 675 | traceln(); |
| 676 | traceln("Exception table:"); |
| 677 | traceln(" from:old/new to:old/new target:old/new type"); |
| 678 | for (int tcnt = tableLength; tcnt > 0; --tcnt) { |
| 679 | int startPC = c.readU2(); |
| 680 | int newStartPC = map[startPC]; |
| 681 | c.writeU2(newStartPC); |
| 682 | int endPC = c.readU2(); |
| 683 | int newEndPC = map[endPC]; |
| 684 | c.writeU2(newEndPC); |
| 685 | int handlerPC = c.readU2(); |
| 686 | int newHandlerPC = map[handlerPC]; |
| 687 | c.writeU2(newHandlerPC); |
| 688 | int catchType = c.copyU2(); |
| 689 | if (Inject.verbose) { |
| 690 | traceFixedWidthInt(startPC, 6); |
| 691 | traceFixedWidthInt(newStartPC, 6); |
| 692 | traceFixedWidthInt(endPC, 6); |
| 693 | traceFixedWidthInt(newEndPC, 6); |
| 694 | traceFixedWidthInt(handlerPC, 6); |
| 695 | traceFixedWidthInt(newHandlerPC, 6); |
| 696 | trace(" "); |
| 697 | if (catchType == 0) |
| 698 | traceln("any"); |
| 699 | else { |
| 700 | traceln("" + catchType); |
| 701 | } |
| 702 | } |
| 703 | } |
| 704 | } |
| 705 | } |
| 706 | |
| 707 | /** |
| 708 | * Copy the line number table for this method code |
| 709 | */ |
| 710 | void copyLineNumberAttr() throws IOException { |
| 711 | // name index already read |
| 712 | c.copy(4); // attr len |
| 713 | int tableLength = c.copyU2(); // line table len |
| 714 | if (tableLength > 0) { |
| 715 | if (Inject.verbose) { |
| 716 | traceln(); |
| 717 | traceln("Line numbers for method " + methodName); |
| 718 | } |
| 719 | for (int tcnt = tableLength; tcnt > 0; --tcnt) { |
| 720 | int startPC = c.readU2(); |
| 721 | int newStartPC = map[startPC]; |
| 722 | c.writeU2(newStartPC); |
| 723 | int lineNumber = c.copyU2(); |
| 724 | if (Inject.verbose) { |
| 725 | traceln(" line " + lineNumber + |
| 726 | ": [was] " + startPC + |
| 727 | " [now] " + newStartPC); |
| 728 | } |
| 729 | } |
| 730 | } |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * Copy the local variable table for this method code |
| 735 | */ |
| 736 | void copyLocalVarAttr() throws IOException { |
| 737 | // name index already read |
| 738 | c.copy(4); // attr len |
| 739 | int tableLength = c.copyU2(); // local var table len |
| 740 | if (tableLength > 0) { |
| 741 | if (Inject.verbose) { |
| 742 | traceln(); |
| 743 | traceln("Local variables for method " + methodName); |
| 744 | } |
| 745 | for (int tcnt = tableLength; tcnt > 0; --tcnt) { |
| 746 | int startPC = c.readU2(); |
| 747 | int newStartPC = map[startPC]; |
| 748 | c.writeU2(newStartPC); |
| 749 | int length = c.readU2(); |
| 750 | int endPC = startPC + length; |
| 751 | int newEndPC = map[endPC]; |
| 752 | int newLength = newEndPC - newStartPC; |
| 753 | c.writeU2(newLength); |
| 754 | int nameIndex = c.copyU2(); |
| 755 | int descriptorIndex = c.copyU2(); |
| 756 | int index = c.copyU2(); |
| 757 | if (Inject.verbose) { |
| 758 | trace(" "); |
| 759 | trace(descriptorIndex); |
| 760 | trace(" "); |
| 761 | trace(nameIndex); |
| 762 | traceln(" pc= [was] " + startPC + " [now] " + newStartPC + |
| 763 | ", length= [was] " + length + " [now] " + newLength + |
| 764 | ", slot=" + index); |
| 765 | } |
| 766 | } |
| 767 | } |
| 768 | } |
| 769 | } |