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 | package ilib; |
| 25 | |
| 26 | import java.io.IOException; |
| 27 | import java.io.File; |
| 28 | import java.io.FileOutputStream; |
| 29 | import java.io.DataOutputStream; |
| 30 | import java.util.List; |
| 31 | import java.util.Iterator; |
| 32 | import java.util.ArrayList; |
| 33 | |
| 34 | public class Inject implements RuntimeConstants { |
| 35 | |
| 36 | public static byte[] instrumentation(Options opt, |
| 37 | ClassLoader loader, |
| 38 | String className, |
| 39 | byte[] classfileBuffer) { |
| 40 | ClassReaderWriter c = new ClassReaderWriter(classfileBuffer); |
| 41 | (new Inject(className, c, loader == null, opt)).doit(); |
| 42 | return c.result(); |
| 43 | } |
| 44 | |
| 45 | static boolean verbose = false; |
| 46 | |
| 47 | final String className; |
| 48 | final ClassReaderWriter c; |
| 49 | final boolean isSystem; |
| 50 | final Options options; |
| 51 | |
| 52 | int constantPoolCount; |
| 53 | int methodsCount; |
| 54 | int methodsCountPos; |
| 55 | int profiler; |
| 56 | int wrappedTrackerIndex = 0; |
| 57 | int thisClassIndex = 0; |
| 58 | |
| 59 | TrackerInjector callInjector; |
| 60 | TrackerInjector allocInjector; |
| 61 | TrackerInjector defaultInjector; |
| 62 | |
| 63 | static interface TrackerInjector extends Injector { |
| 64 | void reinit(int tracker); |
| 65 | int stackSize(int currentSize); |
| 66 | } |
| 67 | |
| 68 | static class SimpleInjector implements TrackerInjector { |
| 69 | byte[] injection; |
| 70 | |
| 71 | public int stackSize(int currentSize) { |
| 72 | return currentSize; |
| 73 | } |
| 74 | |
| 75 | public void reinit(int tracker) { |
| 76 | injection = new byte[3]; |
| 77 | injection[0] = (byte)opc_invokestatic; |
| 78 | injection[1] = (byte)(tracker >> 8); |
| 79 | injection[2] = (byte)tracker; |
| 80 | } |
| 81 | |
| 82 | public byte[] bytecodes(String className, String methodName, int location) { |
| 83 | return injection; |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | static class ObjectInjector implements TrackerInjector { |
| 88 | byte[] injection; |
| 89 | |
| 90 | public int stackSize(int currentSize) { |
| 91 | return currentSize + 1; |
| 92 | } |
| 93 | |
| 94 | public void reinit(int tracker) { |
| 95 | injection = new byte[4]; |
| 96 | injection[0] = (byte)opc_dup; |
| 97 | injection[1] = (byte)opc_invokestatic; |
| 98 | injection[2] = (byte)(tracker >> 8); |
| 99 | injection[3] = (byte)tracker; |
| 100 | } |
| 101 | |
| 102 | public byte[] bytecodes(String className, String methodName, int location) { |
| 103 | return injection; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | class IndexedInjector implements TrackerInjector { |
| 108 | int counter = 0; |
| 109 | int tracker; |
| 110 | List<Info> infoList = new ArrayList<Info>(); |
| 111 | |
| 112 | public int stackSize(int currentSize) { |
| 113 | return currentSize + 1; |
| 114 | } |
| 115 | |
| 116 | public void reinit(int tracker) { |
| 117 | this.tracker = tracker; |
| 118 | } |
| 119 | |
| 120 | void dump(File outDir, String filename) throws IOException { |
| 121 | FileOutputStream fileOut = new FileOutputStream(new File(outDir, filename)); |
| 122 | DataOutputStream dataOut = new DataOutputStream(fileOut); |
| 123 | |
| 124 | String currentClassName = null; |
| 125 | |
| 126 | dataOut.writeInt(infoList.size()); |
| 127 | for (Iterator<Info> it = infoList.iterator(); it.hasNext(); ) { |
| 128 | Info info = it.next(); |
| 129 | if (!info.className.equals(currentClassName)) { |
| 130 | dataOut.writeInt(123456); // class name marker |
| 131 | currentClassName = info.className; |
| 132 | dataOut.writeUTF(currentClassName); |
| 133 | } |
| 134 | dataOut.writeInt(info.location); |
| 135 | dataOut.writeUTF(info.methodName); |
| 136 | } |
| 137 | dataOut.close(); |
| 138 | } |
| 139 | |
| 140 | public byte[] bytecodes(String className, String methodName, int location) { |
| 141 | byte[] injection = new byte[6]; |
| 142 | int injectedIndex = options.fixedIndex != 0? options.fixedIndex : ++counter; |
| 143 | infoList.add(new Info(counter, className, methodName, location)); |
| 144 | injection[0] = (byte)opc_sipush; |
| 145 | injection[1] = (byte)(injectedIndex >> 8); |
| 146 | injection[2] = (byte)injectedIndex; |
| 147 | injection[3] = (byte)opc_invokestatic; |
| 148 | injection[4] = (byte)(tracker >> 8); |
| 149 | injection[5] = (byte)tracker; |
| 150 | return injection; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | Inject(String className, ClassReaderWriter c, boolean isSystem, Options options) { |
| 155 | this.className = className; |
| 156 | this.c = c; |
| 157 | this.isSystem = isSystem; |
| 158 | this.options = options; |
| 159 | } |
| 160 | |
| 161 | void doit() { |
| 162 | int i; |
| 163 | c.copy(4 + 2 + 2); // magic min/maj version |
| 164 | int constantPoolCountPos = c.generatedPosition(); |
| 165 | constantPoolCount = c.copyU2(); |
| 166 | // copy old constant pool |
| 167 | c.copyConstantPool(constantPoolCount); |
| 168 | |
| 169 | if (verbose) { |
| 170 | System.out.println("ConstantPool expanded from: " + |
| 171 | constantPoolCount); |
| 172 | } |
| 173 | |
| 174 | profiler = addClassToConstantPool(options.trackerClassName); |
| 175 | if (options.shouldInstrumentNew || options.shouldInstrumentObjectInit) { |
| 176 | if (options.shouldInstrumentIndexed) { |
| 177 | if (allocInjector == null) { |
| 178 | // first time - create it |
| 179 | allocInjector = new IndexedInjector(); |
| 180 | } |
| 181 | int allocTracker = addMethodToConstantPool(profiler, |
| 182 | options.allocTrackerMethodName, |
| 183 | "(I)V"); |
| 184 | allocInjector.reinit(allocTracker); |
| 185 | } else if (options.shouldInstrumentObject) { |
| 186 | if (allocInjector == null) { |
| 187 | // first time - create it |
| 188 | allocInjector = new ObjectInjector(); |
| 189 | } |
| 190 | int allocTracker = addMethodToConstantPool(profiler, |
| 191 | options.allocTrackerMethodName, |
| 192 | "(Ljava/lang/Object;)V"); |
| 193 | allocInjector.reinit(allocTracker); |
| 194 | } else { |
| 195 | if (allocInjector == null) { |
| 196 | // first time - create it |
| 197 | allocInjector = new SimpleInjector(); |
| 198 | } |
| 199 | int allocTracker = addMethodToConstantPool(profiler, |
| 200 | options.allocTrackerMethodName, |
| 201 | "()V"); |
| 202 | allocInjector.reinit(allocTracker); |
| 203 | } |
| 204 | defaultInjector = allocInjector; |
| 205 | } |
| 206 | if (options.shouldInstrumentCall) { |
| 207 | if (options.shouldInstrumentIndexed) { |
| 208 | if (callInjector == null) { |
| 209 | // first time - create it |
| 210 | callInjector = new IndexedInjector(); |
| 211 | } |
| 212 | int callTracker = addMethodToConstantPool(profiler, |
| 213 | options.callTrackerMethodName, |
| 214 | "(I)V"); |
| 215 | callInjector.reinit(callTracker); |
| 216 | } else { |
| 217 | if (callInjector == null) { |
| 218 | // first time - create it |
| 219 | callInjector = new SimpleInjector(); |
| 220 | } |
| 221 | int callTracker = addMethodToConstantPool(profiler, |
| 222 | options.callTrackerMethodName, |
| 223 | "()V"); |
| 224 | callInjector.reinit(callTracker); |
| 225 | } |
| 226 | defaultInjector = callInjector; |
| 227 | } |
| 228 | |
| 229 | if (verbose) { |
| 230 | System.out.println("To: " + constantPoolCount); |
| 231 | } |
| 232 | |
| 233 | c.setSection(1); |
| 234 | |
| 235 | c.copy(2 + 2 + 2); // access, this, super |
| 236 | int interfaceCount = c.copyU2(); |
| 237 | if (verbose) { |
| 238 | System.out.println("interfaceCount: " + interfaceCount); |
| 239 | } |
| 240 | c.copy(interfaceCount * 2); |
| 241 | copyFields(); // fields |
| 242 | copyMethods(); // methods |
| 243 | int attrCountPos = c.generatedPosition(); |
| 244 | int attrCount = c.copyU2(); |
| 245 | if (verbose) { |
| 246 | System.out.println("class attrCount: " + attrCount); |
| 247 | } |
| 248 | // copy the class attributes |
| 249 | copyAttrs(attrCount); |
| 250 | |
| 251 | c.randomAccessWriteU2(constantPoolCountPos, constantPoolCount); |
| 252 | } |
| 253 | |
| 254 | |
| 255 | void copyFields() { |
| 256 | int count = c.copyU2(); |
| 257 | if (verbose) { |
| 258 | System.out.println("fields count: " + count); |
| 259 | } |
| 260 | for (int i = 0; i < count; ++i) { |
| 261 | c.copy(6); // access, name, descriptor |
| 262 | int attrCount = c.copyU2(); |
| 263 | if (verbose) { |
| 264 | System.out.println("field attr count: " + attrCount); |
| 265 | } |
| 266 | copyAttrs(attrCount); |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | void copyMethods() { |
| 271 | methodsCountPos = c.generatedPosition(); |
| 272 | methodsCount = c.copyU2(); |
| 273 | int initialMethodsCount = methodsCount; |
| 274 | if (verbose) { |
| 275 | System.out.println("methods count: " + methodsCount); |
| 276 | } |
| 277 | for (int i = 0; i < initialMethodsCount; ++i) { |
| 278 | copyMethod(); |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | void copyMethod() { |
| 283 | int accessFlags = c.copyU2();// access flags |
| 284 | if (options.shouldInstrumentNativeMethods && (accessFlags & ACC_NATIVE) != 0) { |
| 285 | wrapNativeMethod(accessFlags); |
| 286 | return; |
| 287 | } |
| 288 | int nameIndex = c.copyU2(); // name |
| 289 | String methodName = c.constantPoolString(nameIndex); |
| 290 | c.copyU2(); // descriptor |
| 291 | int attrCount = c.copyU2(); // attribute count |
| 292 | if (verbose) { |
| 293 | System.out.println("methods attr count: " + attrCount); |
| 294 | } |
| 295 | for (int i = 0; i < attrCount; ++i) { |
| 296 | copyAttrForMethod(methodName, accessFlags); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | void wrapNativeMethod(int accessFlags) { |
| 301 | // first, copy the native method with the name changed |
| 302 | // accessFlags have already been copied |
| 303 | int nameIndex = c.readU2(); // name |
| 304 | String methodName = c.constantPoolString(nameIndex); |
| 305 | String wrappedMethodName = options.wrappedPrefix + methodName; |
| 306 | int wrappedNameIndex = writeCPEntryUtf8(wrappedMethodName); |
| 307 | c.writeU2(wrappedNameIndex); // change to the wrapped name |
| 308 | |
| 309 | int descriptorIndex = c.copyU2(); // descriptor index |
| 310 | |
| 311 | int attrCount = c.copyU2(); // attribute count |
| 312 | // need to replicate these attributes (esp Exceptions) in wrapper |
| 313 | // so mark this location so we can rewind |
| 314 | c.markLocalPositionStart(); |
| 315 | for (int i = 0; i < attrCount; ++i) { |
| 316 | copyAttrForMethod(methodName, accessFlags); |
| 317 | } |
| 318 | if (true) { |
| 319 | System.err.println(" wrapped: " + methodName); |
| 320 | } |
| 321 | |
| 322 | // now write the wrapper method |
| 323 | c.writeU2(accessFlags & ~ACC_NATIVE); |
| 324 | c.writeU2(nameIndex); // original unwrapped name |
| 325 | c.writeU2(descriptorIndex); // descriptor is the same |
| 326 | |
| 327 | c.writeU2(attrCount + 1); // wrapped plus a code attribute |
| 328 | // rewind to wrapped attributes |
| 329 | c.rewind(); |
| 330 | for (int i = 0; i < attrCount; ++i) { |
| 331 | copyAttrForMethod(methodName, accessFlags); |
| 332 | } |
| 333 | |
| 334 | // generate a Code attribute for the wrapper method |
| 335 | int wrappedIndex = addMethodToConstantPool(getThisClassIndex(), |
| 336 | wrappedNameIndex, |
| 337 | descriptorIndex); |
| 338 | String descriptor = c.constantPoolString(descriptorIndex); |
| 339 | createWrapperCodeAttr(nameIndex, accessFlags, descriptor, wrappedIndex); |
| 340 | |
| 341 | // increment method count |
| 342 | c.randomAccessWriteU2(methodsCountPos, ++methodsCount); |
| 343 | } |
| 344 | |
| 345 | void copyAttrs(int attrCount) { |
| 346 | for (int i = 0; i < attrCount; ++i) { |
| 347 | copyAttr(); |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | void copyAttr() { |
| 352 | c.copy(2); // name |
| 353 | int len = c.copyU4(); // attr len |
| 354 | if (verbose) { |
| 355 | System.out.println("attr len: " + len); |
| 356 | } |
| 357 | c.copy(len); // attribute info |
| 358 | } |
| 359 | |
| 360 | void copyAttrForMethod(String methodName, int accessFlags) { |
| 361 | int nameIndex = c.copyU2(); // name |
| 362 | // check for Code attr |
| 363 | if (nameIndex == c.codeAttributeIndex) { |
| 364 | try { |
| 365 | copyCodeAttr(methodName); |
| 366 | } catch (IOException exc) { |
| 367 | System.err.println("Code Exception - " + exc); |
| 368 | System.exit(1); |
| 369 | } |
| 370 | } else { |
| 371 | int len = c.copyU4(); // attr len |
| 372 | if (verbose) { |
| 373 | System.out.println("method attr len: " + len); |
| 374 | } |
| 375 | c.copy(len); // attribute info |
| 376 | } |
| 377 | } |
| 378 | |
| 379 | void copyAttrForCode(InjectBytecodes ib) throws IOException { |
| 380 | int nameIndex = c.copyU2(); // name |
| 381 | |
| 382 | // check for Code attr |
| 383 | if (nameIndex == c.lineNumberAttributeIndex) { |
| 384 | ib.copyLineNumberAttr(); |
| 385 | } else if (nameIndex == c.localVarAttributeIndex) { |
| 386 | ib.copyLocalVarAttr(); |
| 387 | } else { |
| 388 | int len = c.copyU4(); // attr len |
| 389 | if (verbose) { |
| 390 | System.out.println("code attr len: " + len); |
| 391 | } |
| 392 | c.copy(len); // attribute info |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | void copyCodeAttr(String methodName) throws IOException { |
| 397 | if (verbose) { |
| 398 | System.out.println("Code attr found"); |
| 399 | } |
| 400 | int attrLengthPos = c.generatedPosition(); |
| 401 | int attrLength = c.copyU4(); // attr len |
| 402 | int maxStack = c.readU2(); // max stack |
| 403 | c.writeU2(defaultInjector == null? maxStack : |
| 404 | defaultInjector.stackSize(maxStack)); // big enough for injected code |
| 405 | c.copyU2(); // max locals |
| 406 | int codeLengthPos = c.generatedPosition(); |
| 407 | int codeLength = c.copyU4(); // code length |
| 408 | if (options.targetMethod != null && !options.targetMethod.equals(methodName)) { |
| 409 | c.copy(attrLength - 8); // copy remainder minus already copied |
| 410 | return; |
| 411 | } |
| 412 | if (isSystem) { |
| 413 | if (codeLength == 1 && methodName.equals("finalize")) { |
| 414 | if (verbose) { |
| 415 | System.out.println("empty system finalizer not instrumented"); |
| 416 | } |
| 417 | c.copy(attrLength - 8); // copy remainder minus already copied |
| 418 | return; |
| 419 | } |
| 420 | if (codeLength == 1 && methodName.equals("<init>")) { |
| 421 | if (verbose) { |
| 422 | System.out.println("empty system constructor not instrumented"); |
| 423 | } |
| 424 | if (!options.shouldInstrumentObjectInit) { |
| 425 | c.copy(attrLength - 8); // copy remainder minus already copied |
| 426 | return; |
| 427 | } |
| 428 | } |
| 429 | if (methodName.equals("<clinit>")) { |
| 430 | if (verbose) { |
| 431 | System.out.println("system class initializer not instrumented"); |
| 432 | } |
| 433 | c.copy(attrLength - 8); // copy remainder minus already copied |
| 434 | return; |
| 435 | } |
| 436 | } |
| 437 | if (options.shouldInstrumentObjectInit |
| 438 | && (!className.equals("java/lang/Object") |
| 439 | || !methodName.equals("<init>"))) { |
| 440 | c.copy(attrLength - 8); // copy remainder minus already copied |
| 441 | return; |
| 442 | } |
| 443 | |
| 444 | InjectBytecodes ib = new InjectBytecodes(c, codeLength, className, methodName); |
| 445 | |
| 446 | if (options.shouldInstrumentNew) { |
| 447 | ib.injectAfter(opc_new, allocInjector); |
| 448 | ib.injectAfter(opc_newarray, allocInjector); |
| 449 | ib.injectAfter(opc_anewarray, allocInjector); |
| 450 | ib.injectAfter(opc_multianewarray, allocInjector); |
| 451 | } |
| 452 | if (options.shouldInstrumentCall) { |
| 453 | ib.inject(0, callInjector.bytecodes(className, methodName, 0)); |
| 454 | } |
| 455 | if (options.shouldInstrumentObjectInit) { |
| 456 | ib.inject(0, allocInjector.bytecodes(className, methodName, 0)); |
| 457 | } |
| 458 | |
| 459 | ib.adjustOffsets(); |
| 460 | |
| 461 | // fix up code length |
| 462 | int newCodeLength = c.generatedPosition() - (codeLengthPos + 4); |
| 463 | c.randomAccessWriteU4(codeLengthPos, newCodeLength); |
| 464 | if (verbose) { |
| 465 | System.out.println("code length old: " + codeLength + |
| 466 | ", new: " + newCodeLength); |
| 467 | } |
| 468 | |
| 469 | ib.copyExceptionTable(); |
| 470 | |
| 471 | int attrCount = c.copyU2(); |
| 472 | for (int i = 0; i < attrCount; ++i) { |
| 473 | copyAttrForCode(ib); |
| 474 | } |
| 475 | |
| 476 | // fix up attr length |
| 477 | int newAttrLength = c.generatedPosition() - (attrLengthPos + 4); |
| 478 | c.randomAccessWriteU4(attrLengthPos, newAttrLength); |
| 479 | if (verbose) { |
| 480 | System.out.println("attr length old: " + attrLength + |
| 481 | ", new: " + newAttrLength); |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | int nextDescriptorIndex(String descriptor, int index) { |
| 486 | switch (descriptor.charAt(index)) { |
| 487 | case 'B': // byte |
| 488 | case 'C': // char |
| 489 | case 'I': // int |
| 490 | case 'S': // short |
| 491 | case 'Z': // boolean |
| 492 | case 'F': // float |
| 493 | case 'D': // double |
| 494 | case 'J': // long |
| 495 | return index + 1; |
| 496 | case 'L': // object |
| 497 | int i = index + 1; |
| 498 | while (descriptor.charAt(i) != ';') { |
| 499 | ++i; |
| 500 | } |
| 501 | return i + 1; |
| 502 | case '[': // array |
| 503 | return nextDescriptorIndex(descriptor, index + 1); |
| 504 | } |
| 505 | throw new InternalError("should not reach here"); |
| 506 | } |
| 507 | |
| 508 | int getWrappedTrackerIndex() { |
| 509 | if (wrappedTrackerIndex == 0) { |
| 510 | wrappedTrackerIndex = addMethodToConstantPool(profiler, |
| 511 | options.wrappedTrackerMethodName, |
| 512 | "(Ljava/lang/String;I)V"); |
| 513 | } |
| 514 | return wrappedTrackerIndex; |
| 515 | } |
| 516 | |
| 517 | int getThisClassIndex() { |
| 518 | if (thisClassIndex == 0) { |
| 519 | thisClassIndex = addClassToConstantPool(className); |
| 520 | } |
| 521 | return thisClassIndex; |
| 522 | } |
| 523 | |
| 524 | int computeMaxLocals(String descriptor, int accessFlags) { |
| 525 | int index = 1; |
| 526 | int slot = 0; |
| 527 | |
| 528 | if ((accessFlags & ACC_STATIC) == 0) { |
| 529 | ++slot; |
| 530 | } |
| 531 | char type; |
| 532 | while ((type = descriptor.charAt(index)) != ')') { |
| 533 | switch (type) { |
| 534 | case 'B': // byte |
| 535 | case 'C': // char |
| 536 | case 'I': // int |
| 537 | case 'S': // short |
| 538 | case 'Z': // boolean |
| 539 | case 'F': // float |
| 540 | case 'L': // object |
| 541 | case '[': // array |
| 542 | ++slot; |
| 543 | break; |
| 544 | case 'D': // double |
| 545 | case 'J': // long |
| 546 | slot += 2; |
| 547 | break; |
| 548 | } |
| 549 | index = nextDescriptorIndex(descriptor, index); |
| 550 | } |
| 551 | |
| 552 | return slot; |
| 553 | } |
| 554 | |
| 555 | |
| 556 | void createWrapperCodeAttr(int methodNameIndex, int accessFlags, |
| 557 | String descriptor, int wrappedIndex) { |
| 558 | int maxLocals = computeMaxLocals(descriptor, accessFlags); |
| 559 | |
| 560 | c.writeU2(c.codeAttributeIndex); // |
| 561 | int attrLengthPos = c.generatedPosition(); |
| 562 | c.writeU4(0); // attr len -- fix up below |
| 563 | c.writeU2(maxLocals + 4); // max stack |
| 564 | c.writeU2(maxLocals); // max locals |
| 565 | int codeLengthPos = c.generatedPosition(); |
| 566 | c.writeU4(0); // code length -- fix up below |
| 567 | |
| 568 | int methodStringIndex = writeCPEntryString(methodNameIndex); |
| 569 | |
| 570 | c.writeU1(opc_ldc_w); |
| 571 | c.writeU2(methodStringIndex); // send the method name |
| 572 | c.writeU1(opc_sipush); |
| 573 | c.writeU2(options.fixedIndex); |
| 574 | c.writeU1(opc_invokestatic); |
| 575 | c.writeU2(getWrappedTrackerIndex()); |
| 576 | |
| 577 | // set-up args |
| 578 | int index = 1; |
| 579 | int slot = 0; |
| 580 | if ((accessFlags & ACC_STATIC) == 0) { |
| 581 | c.writeU1(opc_aload_0); // this |
| 582 | ++slot; |
| 583 | } |
| 584 | char type; |
| 585 | while ((type = descriptor.charAt(index)) != ')') { |
| 586 | switch (type) { |
| 587 | case 'B': // byte |
| 588 | case 'C': // char |
| 589 | case 'I': // int |
| 590 | case 'S': // short |
| 591 | case 'Z': // boolean |
| 592 | c.writeU1(opc_iload); |
| 593 | c.writeU1(slot); |
| 594 | ++slot; |
| 595 | break; |
| 596 | case 'F': // float |
| 597 | c.writeU1(opc_fload); |
| 598 | c.writeU1(slot); |
| 599 | ++slot; |
| 600 | break; |
| 601 | case 'D': // double |
| 602 | c.writeU1(opc_dload); |
| 603 | c.writeU1(slot); |
| 604 | slot += 2; |
| 605 | break; |
| 606 | case 'J': // long |
| 607 | c.writeU1(opc_lload); |
| 608 | c.writeU1(slot); |
| 609 | slot += 2; |
| 610 | break; |
| 611 | case 'L': // object |
| 612 | case '[': // array |
| 613 | c.writeU1(opc_aload); |
| 614 | c.writeU1(slot); |
| 615 | ++slot; |
| 616 | break; |
| 617 | } |
| 618 | index = nextDescriptorIndex(descriptor, index); |
| 619 | } |
| 620 | |
| 621 | // call the wrapped version |
| 622 | if ((accessFlags & ACC_STATIC) == 0) { |
| 623 | c.writeU1(opc_invokevirtual); |
| 624 | } else { |
| 625 | c.writeU1(opc_invokestatic); |
| 626 | } |
| 627 | c.writeU2(wrappedIndex); |
| 628 | |
| 629 | // return correct type |
| 630 | switch (descriptor.charAt(index+1)) { |
| 631 | case 'B': // byte |
| 632 | case 'C': // char |
| 633 | case 'I': // int |
| 634 | case 'S': // short |
| 635 | case 'Z': // boolean |
| 636 | c.writeU1(opc_ireturn); |
| 637 | break; |
| 638 | case 'F': // float |
| 639 | c.writeU1(opc_freturn); |
| 640 | break; |
| 641 | case 'D': // double |
| 642 | c.writeU1(opc_dreturn); |
| 643 | break; |
| 644 | case 'J': // long |
| 645 | c.writeU1(opc_lreturn); |
| 646 | break; |
| 647 | case 'L': // object |
| 648 | case '[': // array |
| 649 | c.writeU1(opc_areturn); |
| 650 | break; |
| 651 | case 'V': // void |
| 652 | c.writeU1(opc_return); |
| 653 | break; |
| 654 | } |
| 655 | |
| 656 | // end of code |
| 657 | |
| 658 | // fix up code length |
| 659 | int newCodeLength = c.generatedPosition() - (codeLengthPos + 4); |
| 660 | c.randomAccessWriteU4(codeLengthPos, newCodeLength); |
| 661 | |
| 662 | c.writeU2(0); // exception table length |
| 663 | c.writeU2(0); // attribute count |
| 664 | |
| 665 | // fix up attr length |
| 666 | int newAttrLength = c.generatedPosition() - (attrLengthPos + 4); |
| 667 | c.randomAccessWriteU4(attrLengthPos, newAttrLength); |
| 668 | } |
| 669 | |
| 670 | |
| 671 | int addClassToConstantPool(String className) { |
| 672 | int prevSection = c.setSection(0); |
| 673 | int classNameIndex = writeCPEntryUtf8(className); |
| 674 | int classIndex = writeCPEntryClass(classNameIndex); |
| 675 | c.setSection(prevSection); |
| 676 | return classIndex; |
| 677 | } |
| 678 | |
| 679 | int addMethodToConstantPool(int classIndex, |
| 680 | String methodName, |
| 681 | String descr) { |
| 682 | int prevSection = c.setSection(0); |
| 683 | int methodNameIndex = writeCPEntryUtf8(methodName); |
| 684 | int descrIndex = writeCPEntryUtf8(descr); |
| 685 | c.setSection(prevSection); |
| 686 | return addMethodToConstantPool(classIndex, methodNameIndex, descrIndex); |
| 687 | } |
| 688 | |
| 689 | int addMethodToConstantPool(int classIndex, |
| 690 | int methodNameIndex, |
| 691 | int descrIndex) { |
| 692 | int prevSection = c.setSection(0); |
| 693 | int nameAndTypeIndex = writeCPEntryNameAndType(methodNameIndex, |
| 694 | descrIndex); |
| 695 | int methodIndex = writeCPEntryMethodRef(classIndex, nameAndTypeIndex); |
| 696 | c.setSection(prevSection); |
| 697 | return methodIndex; |
| 698 | } |
| 699 | |
| 700 | int writeCPEntryUtf8(String str) { |
| 701 | int prevSection = c.setSection(0); |
| 702 | int len = str.length(); |
| 703 | c.writeU1(CONSTANT_UTF8); // Utf8 tag |
| 704 | c.writeU2(len); |
| 705 | for (int i = 0; i < len; ++i) { |
| 706 | c.writeU1(str.charAt(i)); |
| 707 | } |
| 708 | c.setSection(prevSection); |
| 709 | return constantPoolCount++; |
| 710 | } |
| 711 | |
| 712 | int writeCPEntryString(int utf8Index) { |
| 713 | int prevSection = c.setSection(0); |
| 714 | c.writeU1(CONSTANT_STRING); |
| 715 | c.writeU2(utf8Index); |
| 716 | c.setSection(prevSection); |
| 717 | return constantPoolCount++; |
| 718 | } |
| 719 | |
| 720 | int writeCPEntryClass(int classNameIndex) { |
| 721 | int prevSection = c.setSection(0); |
| 722 | c.writeU1(CONSTANT_CLASS); |
| 723 | c.writeU2(classNameIndex); |
| 724 | c.setSection(prevSection); |
| 725 | return constantPoolCount++; |
| 726 | } |
| 727 | |
| 728 | int writeCPEntryNameAndType(int nameIndex, int descrIndex) { |
| 729 | int prevSection = c.setSection(0); |
| 730 | c.writeU1(CONSTANT_NAMEANDTYPE); |
| 731 | c.writeU2(nameIndex); |
| 732 | c.writeU2(descrIndex); |
| 733 | c.setSection(prevSection); |
| 734 | return constantPoolCount++; |
| 735 | } |
| 736 | |
| 737 | int writeCPEntryMethodRef(int classIndex, int nameAndTypeIndex) { |
| 738 | int prevSection = c.setSection(0); |
| 739 | c.writeU1(CONSTANT_METHOD); |
| 740 | c.writeU2(classIndex); |
| 741 | c.writeU2(nameAndTypeIndex); |
| 742 | c.setSection(prevSection); |
| 743 | return constantPoolCount++; |
| 744 | } |
| 745 | } |