1 /*
2 * Copyright (c) 2002, 2012, 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 boolean hasExceptionTable = m.hasExceptionTable();
508 ExceptionTableElement[] exceptionTable = null;
509 int exceptionTableLen = 0;
510 if (hasExceptionTable) {
511 exceptionTable = m.getExceptionTable();
512 exceptionTableLen = exceptionTable.length;
513 if (DEBUG) debugMessage("\tmethod has exception table");
514 codeSize += exceptionTableLen /* exception table is 4-tuple array */
515 * (2 /* start_pc */ +
516 2 /* end_pc */ +
517 2 /* handler_pc */ +
518 2 /* catch_type */);
519 }
520
521 boolean hasLineNumberTable = m.hasLineNumberTable();
522 LineNumberTableElement[] lineNumberTable = null;
523 int lineNumberAttrLen = 0;
524
525 if (hasLineNumberTable) {
526 if (DEBUG) debugMessage("\tmethod has line number table");
527 lineNumberTable = m.getLineNumberTable();
528 if (DEBUG) debugMessage("\t\tline table length = " + lineNumberTable.length);
529
530 lineNumberAttrLen = 2 /* line number table length */ +
531 lineNumberTable.length * (2 /* start_pc */ + 2 /* line_number */);
532
533 codeSize += 2 /* line number table attr index */ +
534 4 /* line number table attr length */ +
535 lineNumberAttrLen;
536
537 if (DEBUG) debugMessage("\t\tline number table attr size = " +
538 lineNumberAttrLen);
539
540 codeAttrCount++;
541 }
542
543 boolean hasLocalVariableTable = m.hasLocalVariableTable();
544 LocalVariableTableElement[] localVariableTable = null;
545 int localVarAttrLen = 0;
546
547 if (hasLocalVariableTable) {
548 if (DEBUG) debugMessage("\tmethod has local variable table");
549 localVariableTable = m.getLocalVariableTable();
550 if (DEBUG) debugMessage("\t\tlocal variable table length = "
551 + localVariableTable.length);
552 localVarAttrLen =
553 2 /* local variable table length */ +
554 localVariableTable.length * ( 2 /* start_pc */ +
555 2 /* length */ +
556 2 /* name_index */ +
557 2 /* signature_index */ +
558 2 /* variable index */ );
559
560 if (DEBUG) debugMessage("\t\tlocal variable attr size = " +
561 localVarAttrLen);
562
563 codeSize += 2 /* local variable table attr index */ +
564 4 /* local variable table attr length */ +
565 localVarAttrLen;
566
567 codeAttrCount++;
568 }
569
570 // fix ConstantPoolCache indices to ConstantPool indices.
571 rewriteByteCode(m, code);
572
573 // start writing Code
574
575 writeIndex(_codeIndex);
576
577 dos.writeInt(codeSize);
578 if (DEBUG) debugMessage("\tcode attribute length = " + codeSize);
579
580 dos.writeShort((short) m.getMaxStack());
581 if (DEBUG) debugMessage("\tmax stack = " + m.getMaxStack());
582
583 dos.writeShort((short) m.getMaxLocals());
584 if (DEBUG) debugMessage("\tmax locals = " + m.getMaxLocals());
585
586 dos.writeInt(code.length);
587 if (DEBUG) debugMessage("\tcode size = " + code.length);
588
589 dos.write(code);
590
591 // write exception table size
592 dos.writeShort((short) exceptionTableLen);
593 if (DEBUG) debugMessage("\texception table length = " + exceptionTableLen);
594
595 if (exceptionTableLen != 0) {
596 for (int e = 0; e < exceptionTableLen; e++) {
597 dos.writeShort((short) exceptionTable[e].getStartPC());
598 dos.writeShort((short) exceptionTable[e].getEndPC());
599 dos.writeShort((short) exceptionTable[e].getHandlerPC());
600 dos.writeShort((short) exceptionTable[e].getCatchTypeIndex());
601 }
602 }
603
604 dos.writeShort((short)codeAttrCount);
605 if (DEBUG) debugMessage("\tcode attribute count = " + codeAttrCount);
606
607 // write LineNumberTable, if available.
608 if (hasLineNumberTable) {
609 writeIndex(_lineNumberTableIndex);
610 dos.writeInt(lineNumberAttrLen);
611 dos.writeShort((short) lineNumberTable.length);
612 for (int l = 0; l < lineNumberTable.length; l++) {
613 dos.writeShort((short) lineNumberTable[l].getStartBCI());
614 dos.writeShort((short) lineNumberTable[l].getLineNumber());
615 }
616 }
617
618 // write LocalVariableTable, if available.
619 if (hasLocalVariableTable) {
620 writeIndex((short) _localVariableTableIndex);
621 dos.writeInt(localVarAttrLen);
622 dos.writeShort((short) localVariableTable.length);
623 for (int l = 0; l < localVariableTable.length; l++) {
624 dos.writeShort((short) localVariableTable[l].getStartBCI());
625 dos.writeShort((short) localVariableTable[l].getLength());
626 dos.writeShort((short) localVariableTable[l].getNameCPIndex());
627 dos.writeShort((short) localVariableTable[l].getDescriptorCPIndex());
628 dos.writeShort((short) localVariableTable[l].getSlot());
629 }
630 }
631 }
632
633 if (hasCheckedExceptions) {
634 CheckedExceptionElement[] exceptions = m.getCheckedExceptions();
635 writeIndex(_exceptionsIndex);
636
637 int attrSize = 2 /* number_of_exceptions */ +
638 exceptions.length * 2 /* exception_index */;
639 dos.writeInt(attrSize);
640 dos.writeShort(exceptions.length);
641 if (DEBUG) debugMessage("\tmethod has " + exceptions.length
642 + " checked exception(s)");
643 for (int e = 0; e < exceptions.length; e++) {
644 short cpIndex = (short) exceptions[e].getClassCPIndex();
645 dos.writeShort(cpIndex);
646 }
647 }
648
649 if (isGeneric) {
650 writeGenericSignature(m.getGenericSignature().asString());
651 }
652 }
653
654 protected void rewriteByteCode(Method m, byte[] code) {
655 ByteCodeRewriter r = new ByteCodeRewriter(m, cpool, code);
656 r.rewrite();
657 }
658
659 protected void writeGenericSignature(String signature) throws IOException {
660 writeIndex(_signatureIndex);
661 if (DEBUG) debugMessage("signature attribute = " + _signatureIndex);
662 dos.writeInt(2);
663 Short index = (Short) utf8ToIndex.get(signature);
664 dos.writeShort(index.shortValue());
665 if (DEBUG) debugMessage("generic signature = " + index);
666 }
667
668 protected void writeClassAttributes() throws IOException {
669 final long flags = klass.getAccessFlags();
670 final boolean hasSyn = hasSyntheticAttribute((short) flags);
671
672 // check for source file
673 short classAttributeCount = 0;
674
675 if (hasSyn)
676 classAttributeCount++;
677
678 Symbol sourceFileName = klass.getSourceFileName();
679 if (sourceFileName != null)
680 classAttributeCount++;
681
682 Symbol genericSignature = klass.getGenericSignature();
683 if (genericSignature != null)
684 classAttributeCount++;
685
686 TypeArray innerClasses = klass.getInnerClasses();
687 final int numInnerClasses = (int) (innerClasses.getLength() / 4);
688 if (numInnerClasses != 0)
689 classAttributeCount++;
690
691 dos.writeShort(classAttributeCount);
692 if (DEBUG) debugMessage("class attribute count = " + classAttributeCount);
693
694 if (hasSyn)
695 writeSynthetic();
696
697 // write SourceFile, if any
698 if (sourceFileName != null) {
699 writeIndex(_sourceFileIndex);
700 if (DEBUG) debugMessage("source file attribute = " + _sourceFileIndex);
701 dos.writeInt(2);
702 Short index = (Short) utf8ToIndex.get(sourceFileName.asString());
703 dos.writeShort(index.shortValue());
704 if (DEBUG) debugMessage("source file name = " + index);
705 }
706
707 // write Signature, if any
708 if (genericSignature != null) {
709 writeGenericSignature(genericSignature.asString());
710 }
711
712 // write inner classes, if any
713 if (numInnerClasses != 0) {
714 writeIndex(_innerClassesIndex);
715 final int innerAttrLen = 2 /* number_of_inner_classes */ +
716 numInnerClasses * (
717 2 /* inner_class_info_index */ +
718 2 /* outer_class_info_index */ +
719 2 /* inner_class_name_index */ +
720 2 /* inner_class_access_flags */);
721 dos.writeInt(innerAttrLen);
722
723 dos.writeShort(numInnerClasses);
724 if (DEBUG) debugMessage("class has " + numInnerClasses + " inner class entries");
725
726 for (int index = 0; index < numInnerClasses * 4; index++) {
727 dos.writeShort(innerClasses.getShortAt(index));
728 }
729 }
730 }
731 }