Clement Escoffier | 042a0ec | 2007-06-24 15:11:33 +0000 | [diff] [blame^] | 1 | /***
|
| 2 | * ASM: a very small and fast Java bytecode manipulation framework
|
| 3 | * Copyright (c) 2000-2005 INRIA, France Telecom
|
| 4 | * All rights reserved.
|
| 5 | *
|
| 6 | * Redistribution and use in source and binary forms, with or without
|
| 7 | * modification, are permitted provided that the following conditions
|
| 8 | * are met:
|
| 9 | * 1. Redistributions of source code must retain the above copyright
|
| 10 | * notice, this list of conditions and the following disclaimer.
|
| 11 | * 2. Redistributions in binary form must reproduce the above copyright
|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
| 13 | * documentation and/or other materials provided with the distribution.
|
| 14 | * 3. Neither the name of the copyright holders nor the names of its
|
| 15 | * contributors may be used to endorse or promote products derived from
|
| 16 | * this software without specific prior written permission.
|
| 17 | *
|
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
|
| 28 | * THE POSSIBILITY OF SUCH DAMAGE.
|
| 29 | */
|
| 30 | package org.objectweb.asm.commons;
|
| 31 |
|
| 32 | import java.util.ArrayList;
|
| 33 | import java.util.HashMap;
|
| 34 |
|
| 35 | import org.objectweb.asm.Label;
|
| 36 | import org.objectweb.asm.MethodVisitor;
|
| 37 | import org.objectweb.asm.Opcodes;
|
| 38 | import org.objectweb.asm.Type;
|
| 39 |
|
| 40 | /**
|
| 41 | * A {@link org.objectweb.asm.MethodAdapter} to insert before, after and around
|
| 42 | * advices in methods and constructors. <p> The behavior for constructors is
|
| 43 | * like this: <ol>
|
| 44 | *
|
| 45 | * <li>as long as the INVOKESPECIAL for the object initialization has not been
|
| 46 | * reached, every bytecode instruction is dispatched in the ctor code visitor</li>
|
| 47 | *
|
| 48 | * <li>when this one is reached, it is only added in the ctor code visitor and
|
| 49 | * a JP invoke is added</li>
|
| 50 | *
|
| 51 | * <li>after that, only the other code visitor receives the instructions</li>
|
| 52 | *
|
| 53 | * </ol>
|
| 54 | *
|
| 55 | * @author Eugene Kuleshov
|
| 56 | * @author Eric Bruneton
|
| 57 | */
|
| 58 | public abstract class AdviceAdapter extends GeneratorAdapter implements Opcodes
|
| 59 | {
|
| 60 | private static final Object THIS = new Object();
|
| 61 | private static final Object OTHER = new Object();
|
| 62 |
|
| 63 | protected int methodAccess;
|
| 64 | protected String methodDesc;
|
| 65 |
|
| 66 | private boolean constructor;
|
| 67 | private boolean superInitialized;
|
| 68 | private ArrayList stackFrame;
|
| 69 | private HashMap branches;
|
| 70 |
|
| 71 | /**
|
| 72 | * Creates a new {@link AdviceAdapter}.
|
| 73 | *
|
| 74 | * @param mv the method visitor to which this adapter delegates calls.
|
| 75 | * @param access the method's access flags (see {@link Opcodes}).
|
| 76 | * @param name the method's name.
|
| 77 | * @param desc the method's descriptor (see {@link Type Type}).
|
| 78 | */
|
| 79 | public AdviceAdapter(
|
| 80 | final MethodVisitor mv,
|
| 81 | final int access,
|
| 82 | final String name,
|
| 83 | final String desc)
|
| 84 | {
|
| 85 | super(mv, access, name, desc);
|
| 86 | methodAccess = access;
|
| 87 | methodDesc = desc;
|
| 88 |
|
| 89 | constructor = "<init>".equals(name);
|
| 90 | }
|
| 91 |
|
| 92 | public void visitCode() {
|
| 93 | mv.visitCode();
|
| 94 | if (!constructor) {
|
| 95 | superInitialized = true;
|
| 96 | onMethodEnter();
|
| 97 | } else {
|
| 98 | stackFrame = new ArrayList();
|
| 99 | branches = new HashMap();
|
| 100 | }
|
| 101 | }
|
| 102 |
|
| 103 | public void visitLabel(final Label label) {
|
| 104 | mv.visitLabel(label);
|
| 105 |
|
| 106 | if (constructor && branches != null) {
|
| 107 | ArrayList frame = (ArrayList) branches.get(label);
|
| 108 | if (frame != null) {
|
| 109 | stackFrame = frame;
|
| 110 | branches.remove(label);
|
| 111 | }
|
| 112 | }
|
| 113 | }
|
| 114 |
|
| 115 | public void visitInsn(final int opcode) {
|
| 116 | if (constructor) {
|
| 117 | switch (opcode) {
|
| 118 | case RETURN: // empty stack
|
| 119 | onMethodExit(opcode);
|
| 120 | break;
|
| 121 |
|
| 122 | case IRETURN: // 1 before n/a after
|
| 123 | case FRETURN: // 1 before n/a after
|
| 124 | case ARETURN: // 1 before n/a after
|
| 125 | case ATHROW: // 1 before n/a after
|
| 126 | popValue();
|
| 127 | popValue();
|
| 128 | onMethodExit(opcode);
|
| 129 | break;
|
| 130 |
|
| 131 | case LRETURN: // 2 before n/a after
|
| 132 | case DRETURN: // 2 before n/a after
|
| 133 | popValue();
|
| 134 | popValue();
|
| 135 | onMethodExit(opcode);
|
| 136 | break;
|
| 137 |
|
| 138 | case NOP:
|
| 139 | case LALOAD: // remove 2 add 2
|
| 140 | case DALOAD: // remove 2 add 2
|
| 141 | case LNEG:
|
| 142 | case DNEG:
|
| 143 | case FNEG:
|
| 144 | case INEG:
|
| 145 | case L2D:
|
| 146 | case D2L:
|
| 147 | case F2I:
|
| 148 | case I2B:
|
| 149 | case I2C:
|
| 150 | case I2S:
|
| 151 | case I2F:
|
| 152 | case Opcodes.ARRAYLENGTH:
|
| 153 | break;
|
| 154 |
|
| 155 | case ACONST_NULL:
|
| 156 | case ICONST_M1:
|
| 157 | case ICONST_0:
|
| 158 | case ICONST_1:
|
| 159 | case ICONST_2:
|
| 160 | case ICONST_3:
|
| 161 | case ICONST_4:
|
| 162 | case ICONST_5:
|
| 163 | case FCONST_0:
|
| 164 | case FCONST_1:
|
| 165 | case FCONST_2:
|
| 166 | case F2L: // 1 before 2 after
|
| 167 | case F2D:
|
| 168 | case I2L:
|
| 169 | case I2D:
|
| 170 | pushValue(OTHER);
|
| 171 | break;
|
| 172 |
|
| 173 | case LCONST_0:
|
| 174 | case LCONST_1:
|
| 175 | case DCONST_0:
|
| 176 | case DCONST_1:
|
| 177 | pushValue(OTHER);
|
| 178 | pushValue(OTHER);
|
| 179 | break;
|
| 180 |
|
| 181 | case IALOAD: // remove 2 add 1
|
| 182 | case FALOAD: // remove 2 add 1
|
| 183 | case AALOAD: // remove 2 add 1
|
| 184 | case BALOAD: // remove 2 add 1
|
| 185 | case CALOAD: // remove 2 add 1
|
| 186 | case SALOAD: // remove 2 add 1
|
| 187 | case POP:
|
| 188 | case IADD:
|
| 189 | case FADD:
|
| 190 | case ISUB:
|
| 191 | case LSHL: // 3 before 2 after
|
| 192 | case LSHR: // 3 before 2 after
|
| 193 | case LUSHR: // 3 before 2 after
|
| 194 | case L2I: // 2 before 1 after
|
| 195 | case L2F: // 2 before 1 after
|
| 196 | case D2I: // 2 before 1 after
|
| 197 | case D2F: // 2 before 1 after
|
| 198 | case FSUB:
|
| 199 | case FMUL:
|
| 200 | case FDIV:
|
| 201 | case FREM:
|
| 202 | case FCMPL: // 2 before 1 after
|
| 203 | case FCMPG: // 2 before 1 after
|
| 204 | case IMUL:
|
| 205 | case IDIV:
|
| 206 | case IREM:
|
| 207 | case ISHL:
|
| 208 | case ISHR:
|
| 209 | case IUSHR:
|
| 210 | case IAND:
|
| 211 | case IOR:
|
| 212 | case IXOR:
|
| 213 | case MONITORENTER:
|
| 214 | case MONITOREXIT:
|
| 215 | popValue();
|
| 216 | break;
|
| 217 |
|
| 218 | case POP2:
|
| 219 | case LSUB:
|
| 220 | case LMUL:
|
| 221 | case LDIV:
|
| 222 | case LREM:
|
| 223 | case LADD:
|
| 224 | case LAND:
|
| 225 | case LOR:
|
| 226 | case LXOR:
|
| 227 | case DADD:
|
| 228 | case DMUL:
|
| 229 | case DSUB:
|
| 230 | case DDIV:
|
| 231 | case DREM:
|
| 232 | popValue();
|
| 233 | popValue();
|
| 234 | break;
|
| 235 |
|
| 236 | case IASTORE:
|
| 237 | case FASTORE:
|
| 238 | case AASTORE:
|
| 239 | case BASTORE:
|
| 240 | case CASTORE:
|
| 241 | case SASTORE:
|
| 242 | case LCMP: // 4 before 1 after
|
| 243 | case DCMPL:
|
| 244 | case DCMPG:
|
| 245 | popValue();
|
| 246 | popValue();
|
| 247 | popValue();
|
| 248 | break;
|
| 249 |
|
| 250 | case LASTORE:
|
| 251 | case DASTORE:
|
| 252 | popValue();
|
| 253 | popValue();
|
| 254 | popValue();
|
| 255 | popValue();
|
| 256 | break;
|
| 257 |
|
| 258 | case DUP:
|
| 259 | pushValue(peekValue());
|
| 260 | break;
|
| 261 |
|
| 262 | case DUP_X1:
|
| 263 | // TODO optimize this
|
| 264 | {
|
| 265 | Object o1 = popValue();
|
| 266 | Object o2 = popValue();
|
| 267 | pushValue(o1);
|
| 268 | pushValue(o2);
|
| 269 | pushValue(o1);
|
| 270 | }
|
| 271 | break;
|
| 272 |
|
| 273 | case DUP_X2:
|
| 274 | // TODO optimize this
|
| 275 | {
|
| 276 | Object o1 = popValue();
|
| 277 | Object o2 = popValue();
|
| 278 | Object o3 = popValue();
|
| 279 | pushValue(o1);
|
| 280 | pushValue(o3);
|
| 281 | pushValue(o2);
|
| 282 | pushValue(o1);
|
| 283 | }
|
| 284 | break;
|
| 285 |
|
| 286 | case DUP2:
|
| 287 | // TODO optimize this
|
| 288 | {
|
| 289 | Object o1 = popValue();
|
| 290 | Object o2 = popValue();
|
| 291 | pushValue(o2);
|
| 292 | pushValue(o1);
|
| 293 | pushValue(o2);
|
| 294 | pushValue(o1);
|
| 295 | }
|
| 296 | break;
|
| 297 |
|
| 298 | case DUP2_X1:
|
| 299 | // TODO optimize this
|
| 300 | {
|
| 301 | Object o1 = popValue();
|
| 302 | Object o2 = popValue();
|
| 303 | Object o3 = popValue();
|
| 304 | pushValue(o2);
|
| 305 | pushValue(o1);
|
| 306 | pushValue(o3);
|
| 307 | pushValue(o2);
|
| 308 | pushValue(o1);
|
| 309 | }
|
| 310 | break;
|
| 311 |
|
| 312 | case DUP2_X2:
|
| 313 | // TODO optimize this
|
| 314 | {
|
| 315 | Object o1 = popValue();
|
| 316 | Object o2 = popValue();
|
| 317 | Object o3 = popValue();
|
| 318 | Object o4 = popValue();
|
| 319 | pushValue(o2);
|
| 320 | pushValue(o1);
|
| 321 | pushValue(o4);
|
| 322 | pushValue(o3);
|
| 323 | pushValue(o2);
|
| 324 | pushValue(o1);
|
| 325 | }
|
| 326 | break;
|
| 327 |
|
| 328 | case SWAP: {
|
| 329 | Object o1 = popValue();
|
| 330 | Object o2 = popValue();
|
| 331 | pushValue(o1);
|
| 332 | pushValue(o2);
|
| 333 | }
|
| 334 | break;
|
| 335 | }
|
| 336 | } else {
|
| 337 | switch (opcode) {
|
| 338 | case RETURN:
|
| 339 | case IRETURN:
|
| 340 | case FRETURN:
|
| 341 | case ARETURN:
|
| 342 | case LRETURN:
|
| 343 | case DRETURN:
|
| 344 | case ATHROW:
|
| 345 | onMethodExit(opcode);
|
| 346 | break;
|
| 347 | }
|
| 348 | }
|
| 349 | mv.visitInsn(opcode);
|
| 350 | }
|
| 351 |
|
| 352 | public void visitVarInsn(final int opcode, final int var) {
|
| 353 | super.visitVarInsn(opcode, var);
|
| 354 |
|
| 355 | if (constructor) {
|
| 356 | switch (opcode) {
|
| 357 | case ILOAD:
|
| 358 | case FLOAD:
|
| 359 | pushValue(OTHER);
|
| 360 | break;
|
| 361 | case LLOAD:
|
| 362 | case DLOAD:
|
| 363 | pushValue(OTHER);
|
| 364 | pushValue(OTHER);
|
| 365 | break;
|
| 366 | case ALOAD:
|
| 367 | pushValue(var == 0 ? THIS : OTHER);
|
| 368 | break;
|
| 369 | case ASTORE:
|
| 370 | case ISTORE:
|
| 371 | case FSTORE:
|
| 372 | popValue();
|
| 373 | break;
|
| 374 | case LSTORE:
|
| 375 | case DSTORE:
|
| 376 | popValue();
|
| 377 | popValue();
|
| 378 | break;
|
| 379 | }
|
| 380 | }
|
| 381 | }
|
| 382 |
|
| 383 | public void visitFieldInsn(
|
| 384 | final int opcode,
|
| 385 | final String owner,
|
| 386 | final String name,
|
| 387 | final String desc)
|
| 388 | {
|
| 389 | mv.visitFieldInsn(opcode, owner, name, desc);
|
| 390 |
|
| 391 | if (constructor) {
|
| 392 | char c = desc.charAt(0);
|
| 393 | boolean longOrDouble = c == 'J' || c == 'D';
|
| 394 | switch (opcode) {
|
| 395 | case GETSTATIC:
|
| 396 | pushValue(OTHER);
|
| 397 | if (longOrDouble) {
|
| 398 | pushValue(OTHER);
|
| 399 | }
|
| 400 | break;
|
| 401 | case PUTSTATIC:
|
| 402 | popValue();
|
| 403 | if (longOrDouble) {
|
| 404 | popValue();
|
| 405 | }
|
| 406 | break;
|
| 407 | case PUTFIELD:
|
| 408 | popValue();
|
| 409 | if (longOrDouble) {
|
| 410 | popValue();
|
| 411 | popValue();
|
| 412 | }
|
| 413 | break;
|
| 414 | // case GETFIELD:
|
| 415 | default:
|
| 416 | if (longOrDouble) {
|
| 417 | pushValue(OTHER);
|
| 418 | }
|
| 419 | }
|
| 420 | }
|
| 421 | }
|
| 422 |
|
| 423 | public void visitIntInsn(final int opcode, final int operand) {
|
| 424 | mv.visitIntInsn(opcode, operand);
|
| 425 |
|
| 426 | if (constructor && opcode!=NEWARRAY) {
|
| 427 | pushValue(OTHER);
|
| 428 | }
|
| 429 | }
|
| 430 |
|
| 431 | public void visitLdcInsn(final Object cst) {
|
| 432 | mv.visitLdcInsn(cst);
|
| 433 |
|
| 434 | if (constructor) {
|
| 435 | pushValue(OTHER);
|
| 436 | if (cst instanceof Double || cst instanceof Long) {
|
| 437 | pushValue(OTHER);
|
| 438 | }
|
| 439 | }
|
| 440 | }
|
| 441 |
|
| 442 | public void visitMultiANewArrayInsn(final String desc, final int dims) {
|
| 443 | mv.visitMultiANewArrayInsn(desc, dims);
|
| 444 |
|
| 445 | if (constructor) {
|
| 446 | for (int i = 0; i < dims; i++) {
|
| 447 | popValue();
|
| 448 | }
|
| 449 | pushValue(OTHER);
|
| 450 | }
|
| 451 | }
|
| 452 |
|
| 453 | public void visitTypeInsn(final int opcode, final String name) {
|
| 454 | mv.visitTypeInsn(opcode, name);
|
| 455 |
|
| 456 | // ANEWARRAY, CHECKCAST or INSTANCEOF don't change stack
|
| 457 | if (constructor && opcode == NEW) {
|
| 458 | pushValue(OTHER);
|
| 459 | }
|
| 460 | }
|
| 461 |
|
| 462 | public void visitMethodInsn(
|
| 463 | final int opcode,
|
| 464 | final String owner,
|
| 465 | final String name,
|
| 466 | final String desc)
|
| 467 | {
|
| 468 | mv.visitMethodInsn(opcode, owner, name, desc);
|
| 469 |
|
| 470 | if (constructor) {
|
| 471 | Type[] types = Type.getArgumentTypes(desc);
|
| 472 | for (int i = 0; i < types.length; i++) {
|
| 473 | popValue();
|
| 474 | if (types[i].getSize() == 2) {
|
| 475 | popValue();
|
| 476 | }
|
| 477 | }
|
| 478 | switch (opcode) {
|
| 479 | // case INVOKESTATIC:
|
| 480 | // break;
|
| 481 |
|
| 482 | case INVOKEINTERFACE:
|
| 483 | case INVOKEVIRTUAL:
|
| 484 | popValue(); // objectref
|
| 485 | break;
|
| 486 |
|
| 487 | case INVOKESPECIAL:
|
| 488 | Object type = popValue(); // objectref
|
| 489 | if (type == THIS && !superInitialized) {
|
| 490 | onMethodEnter();
|
| 491 | superInitialized = true;
|
| 492 | // once super has been initialized it is no longer
|
| 493 | // necessary to keep track of stack state
|
| 494 | constructor = false;
|
| 495 | }
|
| 496 | break;
|
| 497 | }
|
| 498 |
|
| 499 | Type returnType = Type.getReturnType(desc);
|
| 500 | if (returnType != Type.VOID_TYPE) {
|
| 501 | pushValue(OTHER);
|
| 502 | if (returnType.getSize() == 2) {
|
| 503 | pushValue(OTHER);
|
| 504 | }
|
| 505 | }
|
| 506 | }
|
| 507 | }
|
| 508 |
|
| 509 | public void visitJumpInsn(final int opcode, final Label label) {
|
| 510 | mv.visitJumpInsn(opcode, label);
|
| 511 |
|
| 512 | if (constructor) {
|
| 513 | switch (opcode) {
|
| 514 | case IFEQ:
|
| 515 | case IFNE:
|
| 516 | case IFLT:
|
| 517 | case IFGE:
|
| 518 | case IFGT:
|
| 519 | case IFLE:
|
| 520 | case IFNULL:
|
| 521 | case IFNONNULL:
|
| 522 | popValue();
|
| 523 | break;
|
| 524 |
|
| 525 | case IF_ICMPEQ:
|
| 526 | case IF_ICMPNE:
|
| 527 | case IF_ICMPLT:
|
| 528 | case IF_ICMPGE:
|
| 529 | case IF_ICMPGT:
|
| 530 | case IF_ICMPLE:
|
| 531 | case IF_ACMPEQ:
|
| 532 | case IF_ACMPNE:
|
| 533 | popValue();
|
| 534 | popValue();
|
| 535 | break;
|
| 536 |
|
| 537 | case JSR:
|
| 538 | pushValue(OTHER);
|
| 539 | break;
|
| 540 | }
|
| 541 | addBranch(label);
|
| 542 | }
|
| 543 | }
|
| 544 |
|
| 545 | public void visitLookupSwitchInsn(
|
| 546 | final Label dflt,
|
| 547 | final int[] keys,
|
| 548 | final Label[] labels)
|
| 549 | {
|
| 550 | mv.visitLookupSwitchInsn(dflt, keys, labels);
|
| 551 |
|
| 552 | if (constructor) {
|
| 553 | popValue();
|
| 554 | addBranches(dflt, labels);
|
| 555 | }
|
| 556 | }
|
| 557 |
|
| 558 | public void visitTableSwitchInsn(
|
| 559 | final int min,
|
| 560 | final int max,
|
| 561 | final Label dflt,
|
| 562 | final Label[] labels)
|
| 563 | {
|
| 564 | mv.visitTableSwitchInsn(min, max, dflt, labels);
|
| 565 |
|
| 566 | if (constructor) {
|
| 567 | popValue();
|
| 568 | addBranches(dflt, labels);
|
| 569 | }
|
| 570 | }
|
| 571 |
|
| 572 | private void addBranches(final Label dflt, final Label[] labels) {
|
| 573 | addBranch(dflt);
|
| 574 | for (int i = 0; i < labels.length; i++) {
|
| 575 | addBranch(labels[i]);
|
| 576 | }
|
| 577 | }
|
| 578 |
|
| 579 | private void addBranch(final Label label) {
|
| 580 | if (branches.containsKey(label)) {
|
| 581 | return;
|
| 582 | }
|
| 583 | ArrayList frame = new ArrayList();
|
| 584 | frame.addAll(stackFrame);
|
| 585 | branches.put(label, frame);
|
| 586 | }
|
| 587 |
|
| 588 | private Object popValue() {
|
| 589 | return stackFrame.remove(stackFrame.size() - 1);
|
| 590 | }
|
| 591 |
|
| 592 | private Object peekValue() {
|
| 593 | return stackFrame.get(stackFrame.size() - 1);
|
| 594 | }
|
| 595 |
|
| 596 | private void pushValue(final Object o) {
|
| 597 | stackFrame.add(o);
|
| 598 | }
|
| 599 |
|
| 600 | /**
|
| 601 | * Called at the beginning of the method or after super class class call in
|
| 602 | * the constructor. <br><br>
|
| 603 | *
|
| 604 | * <i>Custom code can use or change all the local variables, but should not
|
| 605 | * change state of the stack.</i>
|
| 606 | */
|
| 607 | protected abstract void onMethodEnter();
|
| 608 |
|
| 609 | /**
|
| 610 | * Called before explicit exit from the method using either return or throw.
|
| 611 | * Top element on the stack contains the return value or exception instance.
|
| 612 | * For example:
|
| 613 | *
|
| 614 | * <pre>
|
| 615 | * public void onMethodExit(int opcode) {
|
| 616 | * if(opcode==RETURN) {
|
| 617 | * visitInsn(ACONST_NULL);
|
| 618 | * } else if(opcode==ARETURN || opcode==ATHROW) {
|
| 619 | * dup();
|
| 620 | * } else {
|
| 621 | * if(opcode==LRETURN || opcode==DRETURN) {
|
| 622 | * dup2();
|
| 623 | * } else {
|
| 624 | * dup();
|
| 625 | * }
|
| 626 | * box(Type.getReturnType(this.methodDesc));
|
| 627 | * }
|
| 628 | * visitIntInsn(SIPUSH, opcode);
|
| 629 | * visitMethodInsn(INVOKESTATIC, owner, "onExit", "(Ljava/lang/Object;I)V");
|
| 630 | * }
|
| 631 | *
|
| 632 | * // an actual call back method
|
| 633 | * public static void onExit(int opcode, Object param) {
|
| 634 | * ...
|
| 635 | * </pre>
|
| 636 | *
|
| 637 | * <br><br>
|
| 638 | *
|
| 639 | * <i>Custom code can use or change all the local variables, but should not
|
| 640 | * change state of the stack.</i>
|
| 641 | *
|
| 642 | * @param opcode one of the RETURN, IRETURN, FRETURN, ARETURN, LRETURN,
|
| 643 | * DRETURN or ATHROW
|
| 644 | *
|
| 645 | */
|
| 646 | protected abstract void onMethodExit(int opcode);
|
| 647 |
|
| 648 | // TODO onException, onMethodCall
|
| 649 |
|
| 650 | }
|