1 /* 2 * Copyright (c) 2002, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.tools.jcore; 26 27 import java.io.*; 28 import java.util.*; 29 import sun.jvm.hotspot.oops.*; 30 import sun.jvm.hotspot.runtime.*; 31 32 public class ClassWriter implements /* imports */ ClassConstants 33 { 34 public static final boolean DEBUG = false; 35 36 protected void debugMessage(String message) { 37 System.out.println(message); 38 } 39 40 protected InstanceKlass klass; 41 protected DataOutputStream dos; 42 protected ConstantPool cpool; 43 44 // Map between class name to index of type CONSTANT_Class 45 protected Map classToIndex = new HashMap(); 46 47 // Map between any modified UTF-8 and it's constant pool index. 48 protected Map utf8ToIndex = new HashMap(); 49 50 // constant pool index for attribute names. 51 52 protected short _sourceFileIndex; 53 protected short _innerClassesIndex; 54 protected short _syntheticIndex; 55 protected short _deprecatedIndex; 56 protected short _constantValueIndex; 57 protected short _codeIndex; 58 protected short _exceptionsIndex; 59 protected short _lineNumberTableIndex; 60 protected short _localVariableTableIndex; 61 protected short _signatureIndex; 62 63 protected static int extractHighShortFromInt(int val) { 64 // must stay in sync with constantPoolOopDesc::name_and_type_at_put, method_at_put, etc. 65 return (val >> 16) & 0xFFFF; 66 } 67 68 protected static int extractLowShortFromInt(int val) { 69 // must stay in sync with constantPoolOopDesc::name_and_type_at_put, method_at_put, etc. 70 return val & 0xFFFF; 71 } 72 73 public ClassWriter(InstanceKlass kls, OutputStream os) { 74 klass = kls; 75 dos = new DataOutputStream(os); 76 cpool = klass.getConstants(); 77 } 78 79 public void write() throws IOException { 80 if (DEBUG) debugMessage("class name = " + klass.getName().asString()); 81 82 // write magic 83 dos.writeInt(0xCAFEBABE); 84 85 writeVersion(); 86 writeConstantPool(); 87 writeClassAccessFlags(); 88 writeThisClass(); 89 writeSuperClass(); 90 writeInterfaces(); 91 writeFields(); 92 writeMethods(); 93 writeClassAttributes(); 94 95 // flush output 96 dos.flush(); 97 } 98 99 protected void writeVersion() throws IOException { 100 dos.writeShort((short)klass.minorVersion()); 101 dos.writeShort((short)klass.majorVersion()); 102 } 103 104 protected void writeIndex(int index) throws IOException { 105 if (index == 0) throw new InternalError(); 106 dos.writeShort(index); 107 } 108 109 protected void writeConstantPool() throws IOException { 110 final TypeArray tags = cpool.getTags(); 111 final long len = tags.getLength(); 112 dos.writeShort((short) len); 113 114 if (DEBUG) debugMessage("constant pool length = " + len); 115 116 int ci = 0; // constant pool index 117 118 // collect all modified UTF-8 Strings from Constant Pool 119 120 for (ci = 1; ci < len; ci++) { 121 byte cpConstType = tags.getByteAt(ci); 122 if(cpConstType == JVM_CONSTANT_Utf8) { 123 Symbol sym = cpool.getSymbolAt(ci); 124 utf8ToIndex.put(sym.asString(), new Short((short) ci)); 125 } 126 else if(cpConstType == JVM_CONSTANT_Long || 127 cpConstType == JVM_CONSTANT_Double) { 128 ci++; 129 } 130 } 131 132 // remember index of attribute name modified UTF-8 strings 133 134 // class attributes 135 Short sourceFileIndex = (Short) utf8ToIndex.get("SourceFile"); 136 _sourceFileIndex = (sourceFileIndex != null)? sourceFileIndex.shortValue() : 0; 137 if (DEBUG) debugMessage("SourceFile index = " + _sourceFileIndex); 138 139 Short innerClassesIndex = (Short) utf8ToIndex.get("InnerClasses"); 140 _innerClassesIndex = (innerClassesIndex != null)? innerClassesIndex.shortValue() : 0; 141 if (DEBUG) debugMessage("InnerClasses index = " + _innerClassesIndex); 142 143 // field attributes 144 Short constantValueIndex = (Short) utf8ToIndex.get("ConstantValue"); 145 _constantValueIndex = (constantValueIndex != null)? 146 constantValueIndex.shortValue() : 0; 147 if (DEBUG) debugMessage("ConstantValue index = " + _constantValueIndex); 148 149 Short syntheticIndex = (Short) utf8ToIndex.get("Synthetic"); 150 _syntheticIndex = (syntheticIndex != null)? syntheticIndex.shortValue() : 0; 151 if (DEBUG) debugMessage("Synthetic index = " + _syntheticIndex); 152 153 Short deprecatedIndex = (Short) utf8ToIndex.get("Deprecated"); 154 _deprecatedIndex = (deprecatedIndex != null)? deprecatedIndex.shortValue() : 0; 155 if (DEBUG) debugMessage("Deprecated index = " + _deprecatedIndex); 156 157 // method attributes 158 Short codeIndex = (Short) utf8ToIndex.get("Code"); 159 _codeIndex = (codeIndex != null)? codeIndex.shortValue() : 0; 160 if (DEBUG) debugMessage("Code index = " + _codeIndex); 161 162 Short exceptionsIndex = (Short) utf8ToIndex.get("Exceptions"); 163 _exceptionsIndex = (exceptionsIndex != null)? exceptionsIndex.shortValue() : 0; 164 if (DEBUG) debugMessage("Exceptions index = " + _exceptionsIndex); 165 166 // Short syntheticIndex = (Short) utf8ToIndex.get("Synthetic"); 167 // Short deprecatedIndex = (Short) utf8ToIndex.get("Deprecated"); 168 169 // Code attributes 170 Short lineNumberTableIndex = (Short) utf8ToIndex.get("LineNumberTable"); 171 _lineNumberTableIndex = (lineNumberTableIndex != null)? 172 lineNumberTableIndex.shortValue() : 0; 173 if (DEBUG) debugMessage("LineNumberTable index = " + _lineNumberTableIndex); 174 175 Short localVariableTableIndex = (Short) utf8ToIndex.get("LocalVariableTable"); 176 _localVariableTableIndex = (localVariableTableIndex != null)? 177 localVariableTableIndex.shortValue() : 0; 178 if (DEBUG) debugMessage("LocalVariableTable index = " + _localVariableTableIndex); 179 180 Short signatureIdx = (Short) utf8ToIndex.get("Signature"); 181 _signatureIndex = (signatureIdx != null)? signatureIdx.shortValue() : 0; 182 if (DEBUG) debugMessage("Signature index = " + _signatureIndex); 183 184 for(ci = 1; ci < len; ci++) { 185 // write cp_info 186 // write constant type 187 byte cpConstType = tags.getByteAt(ci); 188 switch(cpConstType) { 189 case JVM_CONSTANT_Utf8: { 190 dos.writeByte(cpConstType); 191 Symbol sym = cpool.getSymbolAt(ci); 192 dos.writeShort((short)sym.getLength()); 193 dos.write(sym.asByteArray()); 194 if (DEBUG) debugMessage("CP[" + ci + "] = modified UTF-8 " + sym.asString()); 195 break; 196 } 197 198 case JVM_CONSTANT_Unicode: 199 throw new IllegalArgumentException("Unicode constant!"); 200 201 case JVM_CONSTANT_Integer: 202 dos.writeByte(cpConstType); 203 dos.writeInt(cpool.getIntAt(ci)); 204 if (DEBUG) debugMessage("CP[" + ci + "] = int " + cpool.getIntAt(ci)); 205 break; 206 207 case JVM_CONSTANT_Float: 208 dos.writeByte(cpConstType); 209 dos.writeFloat(cpool.getFloatAt(ci)); 210 if (DEBUG) debugMessage("CP[" + ci + "] = float " + cpool.getFloatAt(ci)); 211 break; 212 213 case JVM_CONSTANT_Long: { 214 dos.writeByte(cpConstType); 215 long l = cpool.getLongAt(ci); 216 // long entries occupy two pool entries 217 ci++; 218 dos.writeLong(l); 219 break; 220 } 221 222 case JVM_CONSTANT_Double: 223 dos.writeByte(cpConstType); 224 dos.writeDouble(cpool.getDoubleAt(ci)); 225 // double entries occupy two pool entries 226 ci++; 227 break; 228 229 case JVM_CONSTANT_Class: { 230 dos.writeByte(cpConstType); 231 // Klass already resolved. ConstantPool constains klassOop. 232 Klass refKls = (Klass) cpool.getObjAtRaw(ci); 233 String klassName = refKls.getName().asString(); 234 235 Short s = (Short) utf8ToIndex.get(klassName); 236 classToIndex.put(klassName, new Short((short)ci)); 237 dos.writeShort(s.shortValue()); 238 if (DEBUG) debugMessage("CP[" + ci + "] = class " + s); 239 break; 240 } 241 242 // case JVM_CONSTANT_ClassIndex: 243 case JVM_CONSTANT_UnresolvedClassInError: 244 case JVM_CONSTANT_UnresolvedClass: { 245 dos.writeByte(JVM_CONSTANT_Class); 246 String klassName = cpool.getSymbolAt(ci).asString(); 247 248 Short s = (Short) utf8ToIndex.get(klassName); 249 classToIndex.put(klassName, new Short((short) ci)); 250 251 dos.writeShort(s.shortValue()); 252 if (DEBUG) debugMessage("CP[" + ci + "] = class " + s); 253 break; 254 } 255 256 case JVM_CONSTANT_String: { 257 dos.writeByte(cpConstType); 258 String str = OopUtilities.stringOopToString(cpool.getObjAtRaw(ci)); 259 Short s = (Short) utf8ToIndex.get(str); 260 dos.writeShort(s.shortValue()); 261 if (DEBUG) debugMessage("CP[" + ci + "] = string " + s); 262 break; 263 } 264 265 // case JVM_CONSTANT_StringIndex: 266 case JVM_CONSTANT_UnresolvedString: { 267 dos.writeByte(JVM_CONSTANT_String); 268 String val = cpool.getSymbolAt(ci).asString(); 269 270 Short s = (Short) utf8ToIndex.get(val); 271 dos.writeShort(s.shortValue()); 272 if (DEBUG) debugMessage("CP[" + ci + "] = string " + s); 273 break; 274 } 275 276 // all external, internal method/field references 277 case JVM_CONSTANT_Fieldref: 278 case JVM_CONSTANT_Methodref: 279 case JVM_CONSTANT_InterfaceMethodref: { 280 dos.writeByte(cpConstType); 281 int value = cpool.getIntAt(ci); 282 short klassIndex = (short) extractLowShortFromInt(value); 283 short nameAndTypeIndex = (short) extractHighShortFromInt(value); 284 dos.writeShort(klassIndex); 285 dos.writeShort(nameAndTypeIndex); 286 if (DEBUG) debugMessage("CP[" + ci + "] = ref klass = " + 287 klassIndex + ", N&T = " + nameAndTypeIndex); 288 break; 289 } 290 291 case JVM_CONSTANT_NameAndType: { 292 dos.writeByte(cpConstType); 293 int value = cpool.getIntAt(ci); 294 short nameIndex = (short) extractLowShortFromInt(value); 295 short signatureIndex = (short) extractHighShortFromInt(value); 296 dos.writeShort(nameIndex); 297 dos.writeShort(signatureIndex); 298 if (DEBUG) debugMessage("CP[" + ci + "] = N&T name = " + nameIndex 299 + ", type = " + signatureIndex); 300 break; 301 } 302 303 case JVM_CONSTANT_MethodHandle: { 304 dos.writeByte(cpConstType); 305 int value = cpool.getIntAt(ci); 306 byte refKind = (byte) extractLowShortFromInt(value); 307 short memberIndex = (short) extractHighShortFromInt(value); 308 dos.writeByte(refKind); 309 dos.writeShort(memberIndex); 310 if (DEBUG) debugMessage("CP[" + ci + "] = MH kind = " + 311 refKind + ", mem = " + memberIndex); 312 break; 313 } 314 315 case JVM_CONSTANT_MethodType: { 316 dos.writeByte(cpConstType); 317 int value = cpool.getIntAt(ci); 318 short refIndex = (short) value; 319 dos.writeShort(refIndex); 320 if (DEBUG) debugMessage("CP[" + ci + "] = MT index = " + refIndex); 321 break; 322 } 323 324 case JVM_CONSTANT_InvokeDynamic: { 325 dos.writeByte(cpConstType); 326 int value = cpool.getIntAt(ci); 327 short bsmIndex = (short) extractLowShortFromInt(value); 328 short nameAndTypeIndex = (short) extractHighShortFromInt(value); 329 dos.writeShort(bsmIndex); 330 dos.writeShort(nameAndTypeIndex); 331 if (DEBUG) debugMessage("CP[" + ci + "] = INDY bsm = " + 332 bsmIndex + ", N&T = " + nameAndTypeIndex); 333 break; 334 } 335 336 default: 337 throw new InternalError("Unknown tag: " + cpConstType); 338 } // switch 339 } 340 } 341 342 protected void writeClassAccessFlags() throws IOException { 343 int flags = (int)(klass.getAccessFlags() & JVM_RECOGNIZED_CLASS_MODIFIERS); 344 dos.writeShort((short)flags); 345 } 346 347 protected void writeThisClass() throws IOException { 348 String klassName = klass.getName().asString(); 349 Short index = (Short) classToIndex.get(klassName); 350 dos.writeShort(index.shortValue()); 351 if (DEBUG) debugMessage("this class = " + index); 352 } 353 354 protected void writeSuperClass() throws IOException { 355 Klass superKlass = klass.getSuper(); 356 if (superKlass != null) { // is not java.lang.Object 357 String superName = superKlass.getName().asString(); 358 Short index = (Short) classToIndex.get(superName); 359 if (DEBUG) debugMessage("super class = " + index); 360 dos.writeShort(index.shortValue()); 361 } else { 362 dos.writeShort(0); // no super class 363 } 364 } 365 protected void writeInterfaces() throws IOException { 366 ObjArray interfaces = klass.getLocalInterfaces(); 367 final int len = (int) interfaces.getLength(); 368 369 if (DEBUG) debugMessage("number of interfaces = " + len); 370 371 // write interfaces count 372 dos.writeShort((short) len); 373 for (int i = 0; i < len; i++) { 374 Klass k = (Klass) interfaces.getObjAt(i); 375 Short index = (Short) classToIndex.get(k.getName().asString()); 376 dos.writeShort(index.shortValue()); 377 if (DEBUG) debugMessage("\t" + index); 378 } 379 } 380 381 protected void writeFields() throws IOException { 382 final int length = klass.getJavaFieldsCount(); 383 384 // write number of fields 385 dos.writeShort((short) length); 386 387 if (DEBUG) debugMessage("number of fields = " + length); 388 389 for (int index = 0; index < length; index++) { 390 short accessFlags = klass.getFieldAccessFlags(index); 391 dos.writeShort(accessFlags & (short) JVM_RECOGNIZED_FIELD_MODIFIERS); 392 393 short nameIndex = klass.getFieldNameIndex(index); 394 dos.writeShort(nameIndex); 395 396 short signatureIndex = klass.getFieldSignatureIndex(index); 397 dos.writeShort(signatureIndex); 398 if (DEBUG) debugMessage("\tfield name = " + nameIndex + ", signature = " + signatureIndex); 399 400 short fieldAttributeCount = 0; 401 boolean hasSyn = hasSyntheticAttribute(accessFlags); 402 if (hasSyn) 403 fieldAttributeCount++; 404 405 short initvalIndex = klass.getFieldInitialValueIndex(index); 406 if (initvalIndex != 0) 407 fieldAttributeCount++; 408 409 short genSigIndex = klass.getFieldGenericSignatureIndex(index); 410 if (genSigIndex != 0) 411 fieldAttributeCount++; 412 413 dos.writeShort(fieldAttributeCount); 414 415 // write synthetic, if applicable 416 if (hasSyn) 417 writeSynthetic(); 418 419 if (initvalIndex != 0) { 420 writeIndex(_constantValueIndex); 421 dos.writeInt(2); 422 dos.writeShort(initvalIndex); 423 if (DEBUG) debugMessage("\tfield init value = " + initvalIndex); 424 } 425 426 if (genSigIndex != 0) { 427 writeIndex(_signatureIndex); 428 dos.writeInt(2); 429 dos.writeShort(genSigIndex); 430 if (DEBUG) debugMessage("\tfield generic signature index " + genSigIndex); 431 } 432 } 433 } 434 435 protected boolean isSynthetic(short accessFlags) { 436 return (accessFlags & (short) JVM_ACC_SYNTHETIC) != 0; 437 } 438 439 protected boolean hasSyntheticAttribute(short accessFlags) { 440 // Check if flags have the attribute and if the constant pool contains an entry for it. 441 return isSynthetic(accessFlags) && _syntheticIndex != 0; 442 } 443 444 protected void writeSynthetic() throws IOException { 445 writeIndex(_syntheticIndex); 446 dos.writeInt(0); 447 } 448 449 protected void writeMethods() throws IOException { 450 ObjArray methods = klass.getMethods(); 451 final int len = (int) methods.getLength(); 452 // write number of methods 453 dos.writeShort((short) len); 454 if (DEBUG) debugMessage("number of methods = " + len); 455 for (int m = 0; m < len; m++) { 456 writeMethod((Method) methods.getObjAt(m)); 457 } 458 } 459 460 protected void writeMethod(Method m) throws IOException { 461 long accessFlags = m.getAccessFlags(); 462 dos.writeShort((short) (accessFlags & JVM_RECOGNIZED_METHOD_MODIFIERS)); 463 dos.writeShort((short) m.getNameIndex()); 464 dos.writeShort((short) m.getSignatureIndex()); 465 if (DEBUG) debugMessage("\tmethod name = " + m.getNameIndex() + ", signature = " 466 + m.getSignatureIndex()); 467 468 final boolean isNative = ((accessFlags & JVM_ACC_NATIVE) != 0); 469 final boolean isAbstract = ((accessFlags & JVM_ACC_ABSTRACT) != 0); 470 471 short methodAttributeCount = 0; 472 473 final boolean hasSyn = hasSyntheticAttribute((short)accessFlags); 474 if (hasSyn) 475 methodAttributeCount++; 476 477 final boolean hasCheckedExceptions = m.hasCheckedExceptions(); 478 if (hasCheckedExceptions) 479 methodAttributeCount++; 480 481 final boolean isCodeAvailable = (!isNative) && (!isAbstract); 482 if (isCodeAvailable) 483 methodAttributeCount++; 484 485 final boolean isGeneric = (m.getGenericSignature() != null); 486 if (isGeneric) 487 methodAttributeCount++; 488 489 dos.writeShort(methodAttributeCount); 490 if (DEBUG) debugMessage("\tmethod attribute count = " + methodAttributeCount); 491 492 if (hasSyn) { 493 if (DEBUG) debugMessage("\tmethod is synthetic"); 494 writeSynthetic(); 495 } 496 497 if (isCodeAvailable) { 498 byte[] code = m.getByteCode(); 499 short codeAttrCount = 0; 500 int codeSize = 2 /* max_stack */ + 501 2 /* max_locals */ + 502 4 /* code_length */ + 503 code.length /* code */ + 504 2 /* exp. table len. */ + 505 2 /* code attr. count */; 506 507 TypeArray exceptionTable = m.getExceptionTable(); 508 final int exceptionTableLen = (int) exceptionTable.getLength(); 509 if (exceptionTableLen != 0) { 510 if (DEBUG) debugMessage("\tmethod has exception table"); 511 codeSize += (exceptionTableLen / 4) /* exception table is 4-tuple array */ 512 * (2 /* start_pc */ + 513 2 /* end_pc */ + 514 2 /* handler_pc */ + 515 2 /* catch_type */); 516 } 517 518 boolean hasLineNumberTable = m.hasLineNumberTable(); 519 LineNumberTableElement[] lineNumberTable = null; 520 int lineNumberAttrLen = 0; 521 522 if (hasLineNumberTable) { 523 if (DEBUG) debugMessage("\tmethod has line number table"); 524 lineNumberTable = m.getLineNumberTable(); 525 if (DEBUG) debugMessage("\t\tline table length = " + lineNumberTable.length); 526 527 lineNumberAttrLen = 2 /* line number table length */ + 528 lineNumberTable.length * (2 /* start_pc */ + 2 /* line_number */); 529 530 codeSize += 2 /* line number table attr index */ + 531 4 /* line number table attr length */ + 532 lineNumberAttrLen; 533 534 if (DEBUG) debugMessage("\t\tline number table attr size = " + 535 lineNumberAttrLen); 536 537 codeAttrCount++; 538 } 539 540 boolean hasLocalVariableTable = m.hasLocalVariableTable(); 541 LocalVariableTableElement[] localVariableTable = null; 542 int localVarAttrLen = 0; 543 544 if (hasLocalVariableTable) { 545 if (DEBUG) debugMessage("\tmethod has local variable table"); 546 localVariableTable = m.getLocalVariableTable(); 547 if (DEBUG) debugMessage("\t\tlocal variable table length = " 548 + localVariableTable.length); 549 localVarAttrLen = 550 2 /* local variable table length */ + 551 localVariableTable.length * ( 2 /* start_pc */ + 552 2 /* length */ + 553 2 /* name_index */ + 554 2 /* signature_index */ + 555 2 /* variable index */ ); 556 557 if (DEBUG) debugMessage("\t\tlocal variable attr size = " + 558 localVarAttrLen); 559 560 codeSize += 2 /* local variable table attr index */ + 561 4 /* local variable table attr length */ + 562 localVarAttrLen; 563 564 codeAttrCount++; 565 } 566 567 // fix ConstantPoolCache indices to ConstantPool indices. 568 rewriteByteCode(m, code); 569 570 // start writing Code 571 572 writeIndex(_codeIndex); 573 574 dos.writeInt(codeSize); 575 if (DEBUG) debugMessage("\tcode attribute length = " + codeSize); 576 577 dos.writeShort((short) m.getMaxStack()); 578 if (DEBUG) debugMessage("\tmax stack = " + m.getMaxStack()); 579 580 dos.writeShort((short) m.getMaxLocals()); 581 if (DEBUG) debugMessage("\tmax locals = " + m.getMaxLocals()); 582 583 dos.writeInt(code.length); 584 if (DEBUG) debugMessage("\tcode size = " + code.length); 585 586 dos.write(code); 587 588 // write exception table size 589 dos.writeShort((short) (exceptionTableLen / 4)); 590 if (DEBUG) debugMessage("\texception table length = " + (exceptionTableLen / 4)); 591 592 if (exceptionTableLen != 0) { 593 for (int e = 0; e < exceptionTableLen; e += 4) { 594 dos.writeShort((short) exceptionTable.getIntAt(e)); 595 dos.writeShort((short) exceptionTable.getIntAt(e + 1)); 596 dos.writeShort((short) exceptionTable.getIntAt(e + 2)); 597 dos.writeShort((short) exceptionTable.getIntAt(e + 3)); 598 } 599 } 600 601 dos.writeShort((short)codeAttrCount); 602 if (DEBUG) debugMessage("\tcode attribute count = " + codeAttrCount); 603 604 // write LineNumberTable, if available. 605 if (hasLineNumberTable) { 606 writeIndex(_lineNumberTableIndex); 607 dos.writeInt(lineNumberAttrLen); 608 dos.writeShort((short) lineNumberTable.length); 609 for (int l = 0; l < lineNumberTable.length; l++) { 610 dos.writeShort((short) lineNumberTable[l].getStartBCI()); 611 dos.writeShort((short) lineNumberTable[l].getLineNumber()); 612 } 613 } 614 615 // write LocalVariableTable, if available. 616 if (hasLocalVariableTable) { 617 writeIndex((short) _localVariableTableIndex); 618 dos.writeInt(localVarAttrLen); 619 dos.writeShort((short) localVariableTable.length); 620 for (int l = 0; l < localVariableTable.length; l++) { 621 dos.writeShort((short) localVariableTable[l].getStartBCI()); 622 dos.writeShort((short) localVariableTable[l].getLength()); 623 dos.writeShort((short) localVariableTable[l].getNameCPIndex()); 624 dos.writeShort((short) localVariableTable[l].getDescriptorCPIndex()); 625 dos.writeShort((short) localVariableTable[l].getSlot()); 626 } 627 } 628 } 629 630 if (hasCheckedExceptions) { 631 CheckedExceptionElement[] exceptions = m.getCheckedExceptions(); 632 writeIndex(_exceptionsIndex); 633 634 int attrSize = 2 /* number_of_exceptions */ + 635 exceptions.length * 2 /* exception_index */; 636 dos.writeInt(attrSize); 637 dos.writeShort(exceptions.length); 638 if (DEBUG) debugMessage("\tmethod has " + exceptions.length 639 + " checked exception(s)"); 640 for (int e = 0; e < exceptions.length; e++) { 641 short cpIndex = (short) exceptions[e].getClassCPIndex(); 642 dos.writeShort(cpIndex); 643 } 644 } 645 646 if (isGeneric) { 647 writeGenericSignature(m.getGenericSignature().asString()); 648 } 649 } 650 651 protected void rewriteByteCode(Method m, byte[] code) { 652 ByteCodeRewriter r = new ByteCodeRewriter(m, cpool, code); 653 r.rewrite(); 654 } 655 656 protected void writeGenericSignature(String signature) throws IOException { 657 writeIndex(_signatureIndex); 658 if (DEBUG) debugMessage("signature attribute = " + _signatureIndex); 659 dos.writeInt(2); 660 Short index = (Short) utf8ToIndex.get(signature); 661 dos.writeShort(index.shortValue()); 662 if (DEBUG) debugMessage("generic signature = " + index); 663 } 664 665 protected void writeClassAttributes() throws IOException { 666 final long flags = klass.getAccessFlags(); 667 final boolean hasSyn = hasSyntheticAttribute((short) flags); 668 669 // check for source file 670 short classAttributeCount = 0; 671 672 if (hasSyn) 673 classAttributeCount++; 674 675 Symbol sourceFileName = klass.getSourceFileName(); 676 if (sourceFileName != null) 677 classAttributeCount++; 678 679 Symbol genericSignature = klass.getGenericSignature(); 680 if (genericSignature != null) 681 classAttributeCount++; 682 683 TypeArray innerClasses = klass.getInnerClasses(); 684 final int numInnerClasses = (int) (innerClasses.getLength() / 4); 685 if (numInnerClasses != 0) 686 classAttributeCount++; 687 688 dos.writeShort(classAttributeCount); 689 if (DEBUG) debugMessage("class attribute count = " + classAttributeCount); 690 691 if (hasSyn) 692 writeSynthetic(); 693 694 // write SourceFile, if any 695 if (sourceFileName != null) { 696 writeIndex(_sourceFileIndex); 697 if (DEBUG) debugMessage("source file attribute = " + _sourceFileIndex); 698 dos.writeInt(2); 699 Short index = (Short) utf8ToIndex.get(sourceFileName.asString()); 700 dos.writeShort(index.shortValue()); 701 if (DEBUG) debugMessage("source file name = " + index); 702 } 703 704 // write Signature, if any 705 if (genericSignature != null) { 706 writeGenericSignature(genericSignature.asString()); 707 } 708 709 // write inner classes, if any 710 if (numInnerClasses != 0) { 711 writeIndex(_innerClassesIndex); 712 final int innerAttrLen = 2 /* number_of_inner_classes */ + 713 numInnerClasses * ( 714 2 /* inner_class_info_index */ + 715 2 /* outer_class_info_index */ + 716 2 /* inner_class_name_index */ + 717 2 /* inner_class_access_flags */); 718 dos.writeInt(innerAttrLen); 719 720 dos.writeShort(numInnerClasses); 721 if (DEBUG) debugMessage("class has " + numInnerClasses + " inner class entries"); 722 723 for (int index = 0; index < numInnerClasses * 4; index++) { 724 dos.writeShort(innerClasses.getShortAt(index)); 725 } 726 } 727 } 728 }