1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /*
26 * This file is available under and governed by the GNU General Public
27 * License version 2 only, as published by the Free Software Foundation.
28 * However, the following notice accompanied the original version of this
29 * file:
30 *
31 * ASM: a very small and fast Java bytecode manipulation framework
32 * Copyright (c) 2000-2011 INRIA, France Telecom
33 * All rights reserved.
34 *
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
37 * are met:
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
41 * notice, this list of conditions and the following disclaimer in the
42 * documentation and/or other materials provided with the distribution.
43 * 3. Neither the name of the copyright holders nor the names of its
44 * contributors may be used to endorse or promote products derived from
45 * this software without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
48 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
51 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
52 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
53 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
54 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
55 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
56 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
57 * THE POSSIBILITY OF SUCH DAMAGE.
58 */
59 package jdk.internal.org.objectweb.asm;
60
61 /**
62 * A {@link ClassVisitor} that generates classes in bytecode form. More
63 * precisely this visitor generates a byte array conforming to the Java class
64 * file format. It can be used alone, to generate a Java class "from scratch",
65 * or with one or more {@link ClassReader ClassReader} and adapter class visitor
66 * to generate a modified class from one or more existing Java classes.
67 *
68 * @author Eric Bruneton
69 */
70 public class ClassWriter extends ClassVisitor {
71
72 /**
73 * Flag to automatically compute the maximum stack size and the maximum
74 * number of local variables of methods. If this flag is set, then the
75 * arguments of the {@link MethodVisitor#visitMaxs visitMaxs} method of the
76 * {@link MethodVisitor} returned by the {@link #visitMethod visitMethod}
77 * method will be ignored, and computed automatically from the signature and
78 * the bytecode of each method.
79 *
80 * @see #ClassWriter(int)
81 */
82 public static final int COMPUTE_MAXS = 1;
83
84 /**
85 * Flag to automatically compute the stack map frames of methods from
86 * scratch. If this flag is set, then the calls to the
87 * {@link MethodVisitor#visitFrame} method are ignored, and the stack map
88 * frames are recomputed from the methods bytecode. The arguments of the
89 * {@link MethodVisitor#visitMaxs visitMaxs} method are also ignored and
90 * recomputed from the bytecode. In other words, computeFrames implies
91 * computeMaxs.
92 *
93 * @see #ClassWriter(int)
94 */
95 public static final int COMPUTE_FRAMES = 2;
96
97 /**
98 * Pseudo access flag to distinguish between the synthetic attribute and the
99 * synthetic access flag.
100 */
101 static final int ACC_SYNTHETIC_ATTRIBUTE = 0x40000;
102
103 /**
104 * Factor to convert from ACC_SYNTHETIC_ATTRIBUTE to Opcode.ACC_SYNTHETIC.
105 */
106 static final int TO_ACC_SYNTHETIC = ACC_SYNTHETIC_ATTRIBUTE
107 / Opcodes.ACC_SYNTHETIC;
108
109 /**
110 * The type of instructions without any argument.
111 */
112 static final int NOARG_INSN = 0;
113
114 /**
115 * The type of instructions with an signed byte argument.
116 */
117 static final int SBYTE_INSN = 1;
118
119 /**
120 * The type of instructions with an signed short argument.
121 */
122 static final int SHORT_INSN = 2;
123
124 /**
125 * The type of instructions with a local variable index argument.
126 */
127 static final int VAR_INSN = 3;
128
129 /**
130 * The type of instructions with an implicit local variable index argument.
131 */
132 static final int IMPLVAR_INSN = 4;
133
134 /**
135 * The type of instructions with a type descriptor argument.
136 */
137 static final int TYPE_INSN = 5;
138
139 /**
140 * The type of field and method invocations instructions.
141 */
142 static final int FIELDORMETH_INSN = 6;
143
144 /**
145 * The type of the INVOKEINTERFACE/INVOKEDYNAMIC instruction.
146 */
147 static final int ITFMETH_INSN = 7;
148
149 /**
150 * The type of the INVOKEDYNAMIC instruction.
151 */
152 static final int INDYMETH_INSN = 8;
153
154 /**
155 * The type of instructions with a 2 bytes bytecode offset label.
156 */
157 static final int LABEL_INSN = 9;
158
159 /**
160 * The type of instructions with a 4 bytes bytecode offset label.
161 */
162 static final int LABELW_INSN = 10;
163
164 /**
165 * The type of the LDC instruction.
166 */
167 static final int LDC_INSN = 11;
168
169 /**
170 * The type of the LDC_W and LDC2_W instructions.
171 */
172 static final int LDCW_INSN = 12;
173
174 /**
175 * The type of the IINC instruction.
176 */
177 static final int IINC_INSN = 13;
178
179 /**
180 * The type of the TABLESWITCH instruction.
181 */
182 static final int TABL_INSN = 14;
183
184 /**
185 * The type of the LOOKUPSWITCH instruction.
186 */
187 static final int LOOK_INSN = 15;
188
189 /**
190 * The type of the MULTIANEWARRAY instruction.
191 */
192 static final int MANA_INSN = 16;
193
194 /**
195 * The type of the WIDE instruction.
196 */
197 static final int WIDE_INSN = 17;
198
199 /**
200 * The instruction types of all JVM opcodes.
201 */
202 static final byte[] TYPE;
203
204 /**
205 * The type of CONSTANT_Class constant pool items.
206 */
207 static final int CLASS = 7;
208
209 /**
210 * The type of CONSTANT_Fieldref constant pool items.
211 */
212 static final int FIELD = 9;
213
214 /**
215 * The type of CONSTANT_Methodref constant pool items.
216 */
217 static final int METH = 10;
218
219 /**
220 * The type of CONSTANT_InterfaceMethodref constant pool items.
221 */
222 static final int IMETH = 11;
223
224 /**
225 * The type of CONSTANT_String constant pool items.
226 */
227 static final int STR = 8;
228
229 /**
230 * The type of CONSTANT_Integer constant pool items.
231 */
232 static final int INT = 3;
233
234 /**
235 * The type of CONSTANT_Float constant pool items.
236 */
237 static final int FLOAT = 4;
238
239 /**
240 * The type of CONSTANT_Long constant pool items.
241 */
242 static final int LONG = 5;
243
244 /**
245 * The type of CONSTANT_Double constant pool items.
246 */
247 static final int DOUBLE = 6;
248
249 /**
250 * The type of CONSTANT_NameAndType constant pool items.
251 */
252 static final int NAME_TYPE = 12;
253
254 /**
255 * The type of CONSTANT_Utf8 constant pool items.
256 */
257 static final int UTF8 = 1;
258
259 /**
260 * The type of CONSTANT_MethodType constant pool items.
261 */
262 static final int MTYPE = 16;
263
264 /**
265 * The type of CONSTANT_MethodHandle constant pool items.
266 */
267 static final int HANDLE = 15;
268
269 /**
270 * The type of CONSTANT_InvokeDynamic constant pool items.
271 */
272 static final int INDY = 18;
273
274 /**
275 * The base value for all CONSTANT_MethodHandle constant pool items.
276 * Internally, ASM store the 9 variations of CONSTANT_MethodHandle into 9
277 * different items.
278 */
279 static final int HANDLE_BASE = 20;
280
281 /**
282 * Normal type Item stored in the ClassWriter {@link ClassWriter#typeTable},
283 * instead of the constant pool, in order to avoid clashes with normal
284 * constant pool items in the ClassWriter constant pool's hash table.
285 */
286 static final int TYPE_NORMAL = 30;
287
288 /**
289 * Uninitialized type Item stored in the ClassWriter
290 * {@link ClassWriter#typeTable}, instead of the constant pool, in order to
291 * avoid clashes with normal constant pool items in the ClassWriter constant
292 * pool's hash table.
293 */
294 static final int TYPE_UNINIT = 31;
295
296 /**
297 * Merged type Item stored in the ClassWriter {@link ClassWriter#typeTable},
298 * instead of the constant pool, in order to avoid clashes with normal
299 * constant pool items in the ClassWriter constant pool's hash table.
300 */
301 static final int TYPE_MERGED = 32;
302
303 /**
304 * The type of BootstrapMethods items. These items are stored in a special
305 * class attribute named BootstrapMethods and not in the constant pool.
306 */
307 static final int BSM = 33;
308
309 /**
310 * The class reader from which this class writer was constructed, if any.
311 */
312 ClassReader cr;
313
314 /**
315 * Minor and major version numbers of the class to be generated.
316 */
317 int version;
318
319 /**
320 * Index of the next item to be added in the constant pool.
321 */
322 int index;
323
324 /**
325 * The constant pool of this class.
326 */
327 final ByteVector pool;
328
329 /**
330 * The constant pool's hash table data.
331 */
332 Item[] items;
333
334 /**
335 * The threshold of the constant pool's hash table.
336 */
337 int threshold;
338
339 /**
340 * A reusable key used to look for items in the {@link #items} hash table.
341 */
342 final Item key;
343
344 /**
345 * A reusable key used to look for items in the {@link #items} hash table.
346 */
347 final Item key2;
348
349 /**
350 * A reusable key used to look for items in the {@link #items} hash table.
351 */
352 final Item key3;
353
354 /**
355 * A reusable key used to look for items in the {@link #items} hash table.
356 */
357 final Item key4;
358
359 /**
360 * A type table used to temporarily store internal names that will not
361 * necessarily be stored in the constant pool. This type table is used by
362 * the control flow and data flow analysis algorithm used to compute stack
363 * map frames from scratch. This array associates to each index <tt>i</tt>
364 * the Item whose index is <tt>i</tt>. All Item objects stored in this array
365 * are also stored in the {@link #items} hash table. These two arrays allow
366 * to retrieve an Item from its index or, conversely, to get the index of an
367 * Item from its value. Each Item stores an internal name in its
368 * {@link Item#strVal1} field.
369 */
370 Item[] typeTable;
371
372 /**
373 * Number of elements in the {@link #typeTable} array.
374 */
375 private short typeCount;
376
377 /**
378 * The access flags of this class.
379 */
380 private int access;
381
382 /**
383 * The constant pool item that contains the internal name of this class.
384 */
385 private int name;
386
387 /**
388 * The internal name of this class.
389 */
390 String thisName;
391
392 /**
393 * The constant pool item that contains the signature of this class.
394 */
395 private int signature;
396
397 /**
398 * The constant pool item that contains the internal name of the super class
399 * of this class.
400 */
401 private int superName;
402
403 /**
404 * Number of interfaces implemented or extended by this class or interface.
405 */
406 private int interfaceCount;
407
408 /**
409 * The interfaces implemented or extended by this class or interface. More
410 * precisely, this array contains the indexes of the constant pool items
411 * that contain the internal names of these interfaces.
412 */
413 private int[] interfaces;
414
415 /**
416 * The index of the constant pool item that contains the name of the source
417 * file from which this class was compiled.
418 */
419 private int sourceFile;
420
421 /**
422 * The SourceDebug attribute of this class.
423 */
424 private ByteVector sourceDebug;
425
426 /**
427 * The constant pool item that contains the name of the enclosing class of
428 * this class.
429 */
430 private int enclosingMethodOwner;
431
432 /**
433 * The constant pool item that contains the name and descriptor of the
434 * enclosing method of this class.
435 */
436 private int enclosingMethod;
437
438 /**
439 * The runtime visible annotations of this class.
440 */
441 private AnnotationWriter anns;
442
443 /**
444 * The runtime invisible annotations of this class.
445 */
446 private AnnotationWriter ianns;
447
448 /**
449 * The runtime visible type annotations of this class.
450 */
451 private AnnotationWriter tanns;
452
453 /**
454 * The runtime invisible type annotations of this class.
455 */
456 private AnnotationWriter itanns;
457
458 /**
459 * The non standard attributes of this class.
460 */
461 private Attribute attrs;
462
463 /**
464 * The number of entries in the InnerClasses attribute.
465 */
466 private int innerClassesCount;
467
468 /**
469 * The InnerClasses attribute.
470 */
471 private ByteVector innerClasses;
472
473 /**
474 * The number of entries in the BootstrapMethods attribute.
475 */
476 int bootstrapMethodsCount;
477
478 /**
479 * The BootstrapMethods attribute.
480 */
481 ByteVector bootstrapMethods;
482
483 /**
484 * The fields of this class. These fields are stored in a linked list of
485 * {@link FieldWriter} objects, linked to each other by their
486 * {@link FieldWriter#fv} field. This field stores the first element of this
487 * list.
488 */
489 FieldWriter firstField;
490
491 /**
492 * The fields of this class. These fields are stored in a linked list of
493 * {@link FieldWriter} objects, linked to each other by their
494 * {@link FieldWriter#fv} field. This field stores the last element of this
495 * list.
496 */
497 FieldWriter lastField;
498
499 /**
500 * The methods of this class. These methods are stored in a linked list of
501 * {@link MethodWriter} objects, linked to each other by their
502 * {@link MethodWriter#mv} field. This field stores the first element of
503 * this list.
504 */
505 MethodWriter firstMethod;
506
507 /**
508 * The methods of this class. These methods are stored in a linked list of
509 * {@link MethodWriter} objects, linked to each other by their
510 * {@link MethodWriter#mv} field. This field stores the last element of this
511 * list.
512 */
513 MethodWriter lastMethod;
514
515 /**
516 * <tt>true</tt> if the maximum stack size and number of local variables
517 * must be automatically computed.
518 */
519 private boolean computeMaxs;
520
521 /**
522 * <tt>true</tt> if the stack map frames must be recomputed from scratch.
523 */
524 private boolean computeFrames;
525
526 /**
527 * <tt>true</tt> if the stack map tables of this class are invalid. The
528 * {@link MethodWriter#resizeInstructions} method cannot transform existing
529 * stack map tables, and so produces potentially invalid classes when it is
530 * executed. In this case the class is reread and rewritten with the
531 * {@link #COMPUTE_FRAMES} option (the resizeInstructions method can resize
532 * stack map tables when this option is used).
533 */
534 boolean invalidFrames;
535
536 // ------------------------------------------------------------------------
537 // Static initializer
538 // ------------------------------------------------------------------------
539
540 /**
541 * Computes the instruction types of JVM opcodes.
542 */
543 static {
544 int i;
545 byte[] b = new byte[220];
546 String s = "AAAAAAAAAAAAAAAABCLMMDDDDDEEEEEEEEEEEEEEEEEEEEAAAAAAAADD"
547 + "DDDEEEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
548 + "AAAAAAAAAAAAAAAAANAAAAAAAAAAAAAAAAAAAAJJJJJJJJJJJJJJJJDOPAA"
549 + "AAAAGGGGGGGHIFBFAAFFAARQJJKKJJJJJJJJJJJJJJJJJJ";
550 for (i = 0; i < b.length; ++i) {
551 b[i] = (byte) (s.charAt(i) - 'A');
552 }
553 TYPE = b;
554
555 // code to generate the above string
556 //
557 // // SBYTE_INSN instructions
558 // b[Constants.NEWARRAY] = SBYTE_INSN;
559 // b[Constants.BIPUSH] = SBYTE_INSN;
560 //
561 // // SHORT_INSN instructions
562 // b[Constants.SIPUSH] = SHORT_INSN;
563 //
564 // // (IMPL)VAR_INSN instructions
565 // b[Constants.RET] = VAR_INSN;
566 // for (i = Constants.ILOAD; i <= Constants.ALOAD; ++i) {
567 // b[i] = VAR_INSN;
568 // }
569 // for (i = Constants.ISTORE; i <= Constants.ASTORE; ++i) {
570 // b[i] = VAR_INSN;
571 // }
572 // for (i = 26; i <= 45; ++i) { // ILOAD_0 to ALOAD_3
573 // b[i] = IMPLVAR_INSN;
574 // }
575 // for (i = 59; i <= 78; ++i) { // ISTORE_0 to ASTORE_3
576 // b[i] = IMPLVAR_INSN;
577 // }
578 //
579 // // TYPE_INSN instructions
580 // b[Constants.NEW] = TYPE_INSN;
581 // b[Constants.ANEWARRAY] = TYPE_INSN;
582 // b[Constants.CHECKCAST] = TYPE_INSN;
583 // b[Constants.INSTANCEOF] = TYPE_INSN;
584 //
585 // // (Set)FIELDORMETH_INSN instructions
586 // for (i = Constants.GETSTATIC; i <= Constants.INVOKESTATIC; ++i) {
587 // b[i] = FIELDORMETH_INSN;
588 // }
589 // b[Constants.INVOKEINTERFACE] = ITFMETH_INSN;
590 // b[Constants.INVOKEDYNAMIC] = INDYMETH_INSN;
591 //
592 // // LABEL(W)_INSN instructions
593 // for (i = Constants.IFEQ; i <= Constants.JSR; ++i) {
594 // b[i] = LABEL_INSN;
595 // }
596 // b[Constants.IFNULL] = LABEL_INSN;
597 // b[Constants.IFNONNULL] = LABEL_INSN;
598 // b[200] = LABELW_INSN; // GOTO_W
599 // b[201] = LABELW_INSN; // JSR_W
600 // // temporary opcodes used internally by ASM - see Label and
601 // MethodWriter
602 // for (i = 202; i < 220; ++i) {
603 // b[i] = LABEL_INSN;
604 // }
605 //
606 // // LDC(_W) instructions
607 // b[Constants.LDC] = LDC_INSN;
608 // b[19] = LDCW_INSN; // LDC_W
609 // b[20] = LDCW_INSN; // LDC2_W
610 //
611 // // special instructions
612 // b[Constants.IINC] = IINC_INSN;
613 // b[Constants.TABLESWITCH] = TABL_INSN;
614 // b[Constants.LOOKUPSWITCH] = LOOK_INSN;
615 // b[Constants.MULTIANEWARRAY] = MANA_INSN;
616 // b[196] = WIDE_INSN; // WIDE
617 //
618 // for (i = 0; i < b.length; ++i) {
619 // System.err.print((char)('A' + b[i]));
620 // }
621 // System.err.println();
622 }
623
624 // ------------------------------------------------------------------------
625 // Constructor
626 // ------------------------------------------------------------------------
627
628 /**
629 * Constructs a new {@link ClassWriter} object.
630 *
631 * @param flags
632 * option flags that can be used to modify the default behavior
633 * of this class. See {@link #COMPUTE_MAXS},
634 * {@link #COMPUTE_FRAMES}.
635 */
636 public ClassWriter(final int flags) {
637 super(Opcodes.ASM5);
638 index = 1;
639 pool = new ByteVector();
640 items = new Item[256];
641 threshold = (int) (0.75d * items.length);
642 key = new Item();
643 key2 = new Item();
644 key3 = new Item();
645 key4 = new Item();
646 this.computeMaxs = (flags & COMPUTE_MAXS) != 0;
647 this.computeFrames = (flags & COMPUTE_FRAMES) != 0;
648 }
649
650 /**
651 * Constructs a new {@link ClassWriter} object and enables optimizations for
652 * "mostly add" bytecode transformations. These optimizations are the
653 * following:
654 *
655 * <ul>
656 * <li>The constant pool from the original class is copied as is in the new
657 * class, which saves time. New constant pool entries will be added at the
658 * end if necessary, but unused constant pool entries <i>won't be
659 * removed</i>.</li>
660 * <li>Methods that are not transformed are copied as is in the new class,
661 * directly from the original class bytecode (i.e. without emitting visit
662 * events for all the method instructions), which saves a <i>lot</i> of
663 * time. Untransformed methods are detected by the fact that the
664 * {@link ClassReader} receives {@link MethodVisitor} objects that come from
665 * a {@link ClassWriter} (and not from any other {@link ClassVisitor}
666 * instance).</li>
667 * </ul>
668 *
669 * @param classReader
670 * the {@link ClassReader} used to read the original class. It
671 * will be used to copy the entire constant pool from the
672 * original class and also to copy other fragments of original
673 * bytecode where applicable.
674 * @param flags
675 * option flags that can be used to modify the default behavior
676 * of this class. <i>These option flags do not affect methods
677 * that are copied as is in the new class. This means that the
678 * maximum stack size nor the stack frames will be computed for
679 * these methods</i>. See {@link #COMPUTE_MAXS},
680 * {@link #COMPUTE_FRAMES}.
681 */
682 public ClassWriter(final ClassReader classReader, final int flags) {
683 this(flags);
684 classReader.copyPool(this);
685 this.cr = classReader;
686 }
687
688 // ------------------------------------------------------------------------
689 // Implementation of the ClassVisitor abstract class
690 // ------------------------------------------------------------------------
691
692 @Override
693 public final void visit(final int version, final int access,
694 final String name, final String signature, final String superName,
695 final String[] interfaces) {
696 this.version = version;
697 this.access = access;
698 this.name = newClass(name);
699 thisName = name;
700 if (ClassReader.SIGNATURES && signature != null) {
701 this.signature = newUTF8(signature);
702 }
703 this.superName = superName == null ? 0 : newClass(superName);
704 if (interfaces != null && interfaces.length > 0) {
705 interfaceCount = interfaces.length;
706 this.interfaces = new int[interfaceCount];
707 for (int i = 0; i < interfaceCount; ++i) {
708 this.interfaces[i] = newClass(interfaces[i]);
709 }
710 }
711 }
712
713 @Override
714 public final void visitSource(final String file, final String debug) {
715 if (file != null) {
716 sourceFile = newUTF8(file);
717 }
718 if (debug != null) {
719 sourceDebug = new ByteVector().encodeUTF8(debug, 0,
720 Integer.MAX_VALUE);
721 }
722 }
723
724 @Override
725 public final void visitOuterClass(final String owner, final String name,
726 final String desc) {
727 enclosingMethodOwner = newClass(owner);
728 if (name != null && desc != null) {
729 enclosingMethod = newNameType(name, desc);
730 }
731 }
732
733 @Override
734 public final AnnotationVisitor visitAnnotation(final String desc,
735 final boolean visible) {
736 if (!ClassReader.ANNOTATIONS) {
737 return null;
738 }
739 ByteVector bv = new ByteVector();
740 // write type, and reserve space for values count
741 bv.putShort(newUTF8(desc)).putShort(0);
742 AnnotationWriter aw = new AnnotationWriter(this, true, bv, bv, 2);
743 if (visible) {
744 aw.next = anns;
745 anns = aw;
746 } else {
747 aw.next = ianns;
748 ianns = aw;
749 }
750 return aw;
751 }
752
753 @Override
754 public final AnnotationVisitor visitTypeAnnotation(int typeRef,
755 TypePath typePath, final String desc, final boolean visible) {
756 if (!ClassReader.ANNOTATIONS) {
757 return null;
758 }
759 ByteVector bv = new ByteVector();
760 // write target_type and target_info
761 AnnotationWriter.putTarget(typeRef, typePath, bv);
762 // write type, and reserve space for values count
763 bv.putShort(newUTF8(desc)).putShort(0);
764 AnnotationWriter aw = new AnnotationWriter(this, true, bv, bv,
765 bv.length - 2);
766 if (visible) {
767 aw.next = tanns;
768 tanns = aw;
769 } else {
770 aw.next = itanns;
771 itanns = aw;
772 }
773 return aw;
774 }
775
776 @Override
777 public final void visitAttribute(final Attribute attr) {
778 attr.next = attrs;
779 attrs = attr;
780 }
781
782 @Override
783 public final void visitInnerClass(final String name,
784 final String outerName, final String innerName, final int access) {
785 if (innerClasses == null) {
786 innerClasses = new ByteVector();
787 }
788 ++innerClassesCount;
789 innerClasses.putShort(name == null ? 0 : newClass(name));
790 innerClasses.putShort(outerName == null ? 0 : newClass(outerName));
791 innerClasses.putShort(innerName == null ? 0 : newUTF8(innerName));
792 innerClasses.putShort(access);
793 }
794
795 @Override
796 public final FieldVisitor visitField(final int access, final String name,
797 final String desc, final String signature, final Object value) {
798 return new FieldWriter(this, access, name, desc, signature, value);
799 }
800
801 @Override
802 public final MethodVisitor visitMethod(final int access, final String name,
803 final String desc, final String signature, final String[] exceptions) {
804 return new MethodWriter(this, access, name, desc, signature,
805 exceptions, computeMaxs, computeFrames);
806 }
807
808 @Override
809 public final void visitEnd() {
810 }
811
812 // ------------------------------------------------------------------------
813 // Other public methods
814 // ------------------------------------------------------------------------
815
816 /**
817 * Returns the bytecode of the class that was build with this class writer.
818 *
819 * @return the bytecode of the class that was build with this class writer.
820 */
821 public byte[] toByteArray() {
822 if (index > 0xFFFF) {
823 throw new RuntimeException("Class file too large!");
824 }
825 // computes the real size of the bytecode of this class
826 int size = 24 + 2 * interfaceCount;
827 int nbFields = 0;
828 FieldWriter fb = firstField;
829 while (fb != null) {
830 ++nbFields;
831 size += fb.getSize();
832 fb = (FieldWriter) fb.fv;
833 }
834 int nbMethods = 0;
835 MethodWriter mb = firstMethod;
836 while (mb != null) {
837 ++nbMethods;
838 size += mb.getSize();
839 mb = (MethodWriter) mb.mv;
840 }
841 int attributeCount = 0;
842 if (bootstrapMethods != null) {
843 // we put it as first attribute in order to improve a bit
844 // ClassReader.copyBootstrapMethods
845 ++attributeCount;
846 size += 8 + bootstrapMethods.length;
847 newUTF8("BootstrapMethods");
848 }
849 if (ClassReader.SIGNATURES && signature != 0) {
850 ++attributeCount;
851 size += 8;
852 newUTF8("Signature");
853 }
854 if (sourceFile != 0) {
855 ++attributeCount;
856 size += 8;
857 newUTF8("SourceFile");
858 }
859 if (sourceDebug != null) {
860 ++attributeCount;
861 size += sourceDebug.length + 6;
862 newUTF8("SourceDebugExtension");
863 }
864 if (enclosingMethodOwner != 0) {
865 ++attributeCount;
866 size += 10;
867 newUTF8("EnclosingMethod");
868 }
869 if ((access & Opcodes.ACC_DEPRECATED) != 0) {
870 ++attributeCount;
871 size += 6;
872 newUTF8("Deprecated");
873 }
874 if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
875 if ((version & 0xFFFF) < Opcodes.V1_5
876 || (access & ACC_SYNTHETIC_ATTRIBUTE) != 0) {
877 ++attributeCount;
878 size += 6;
879 newUTF8("Synthetic");
880 }
881 }
882 if (innerClasses != null) {
883 ++attributeCount;
884 size += 8 + innerClasses.length;
885 newUTF8("InnerClasses");
886 }
887 if (ClassReader.ANNOTATIONS && anns != null) {
888 ++attributeCount;
889 size += 8 + anns.getSize();
890 newUTF8("RuntimeVisibleAnnotations");
891 }
892 if (ClassReader.ANNOTATIONS && ianns != null) {
893 ++attributeCount;
894 size += 8 + ianns.getSize();
895 newUTF8("RuntimeInvisibleAnnotations");
896 }
897 if (ClassReader.ANNOTATIONS && tanns != null) {
898 ++attributeCount;
899 size += 8 + tanns.getSize();
900 newUTF8("RuntimeVisibleTypeAnnotations");
901 }
902 if (ClassReader.ANNOTATIONS && itanns != null) {
903 ++attributeCount;
904 size += 8 + itanns.getSize();
905 newUTF8("RuntimeInvisibleTypeAnnotations");
906 }
907 if (attrs != null) {
908 attributeCount += attrs.getCount();
909 size += attrs.getSize(this, null, 0, -1, -1);
910 }
911 size += pool.length;
912 // allocates a byte vector of this size, in order to avoid unnecessary
913 // arraycopy operations in the ByteVector.enlarge() method
914 ByteVector out = new ByteVector(size);
915 out.putInt(0xCAFEBABE).putInt(version);
916 out.putShort(index).putByteArray(pool.data, 0, pool.length);
917 int mask = Opcodes.ACC_DEPRECATED | ACC_SYNTHETIC_ATTRIBUTE
918 | ((access & ACC_SYNTHETIC_ATTRIBUTE) / TO_ACC_SYNTHETIC);
919 out.putShort(access & ~mask).putShort(name).putShort(superName);
920 out.putShort(interfaceCount);
921 for (int i = 0; i < interfaceCount; ++i) {
922 out.putShort(interfaces[i]);
923 }
924 out.putShort(nbFields);
925 fb = firstField;
926 while (fb != null) {
927 fb.put(out);
928 fb = (FieldWriter) fb.fv;
929 }
930 out.putShort(nbMethods);
931 mb = firstMethod;
932 while (mb != null) {
933 mb.put(out);
934 mb = (MethodWriter) mb.mv;
935 }
936 out.putShort(attributeCount);
937 if (bootstrapMethods != null) {
938 out.putShort(newUTF8("BootstrapMethods"));
939 out.putInt(bootstrapMethods.length + 2).putShort(
940 bootstrapMethodsCount);
941 out.putByteArray(bootstrapMethods.data, 0, bootstrapMethods.length);
942 }
943 if (ClassReader.SIGNATURES && signature != 0) {
944 out.putShort(newUTF8("Signature")).putInt(2).putShort(signature);
945 }
946 if (sourceFile != 0) {
947 out.putShort(newUTF8("SourceFile")).putInt(2).putShort(sourceFile);
948 }
949 if (sourceDebug != null) {
950 int len = sourceDebug.length;
951 out.putShort(newUTF8("SourceDebugExtension")).putInt(len);
952 out.putByteArray(sourceDebug.data, 0, len);
953 }
954 if (enclosingMethodOwner != 0) {
955 out.putShort(newUTF8("EnclosingMethod")).putInt(4);
956 out.putShort(enclosingMethodOwner).putShort(enclosingMethod);
957 }
958 if ((access & Opcodes.ACC_DEPRECATED) != 0) {
959 out.putShort(newUTF8("Deprecated")).putInt(0);
960 }
961 if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
962 if ((version & 0xFFFF) < Opcodes.V1_5
963 || (access & ACC_SYNTHETIC_ATTRIBUTE) != 0) {
964 out.putShort(newUTF8("Synthetic")).putInt(0);
965 }
966 }
967 if (innerClasses != null) {
968 out.putShort(newUTF8("InnerClasses"));
969 out.putInt(innerClasses.length + 2).putShort(innerClassesCount);
970 out.putByteArray(innerClasses.data, 0, innerClasses.length);
971 }
972 if (ClassReader.ANNOTATIONS && anns != null) {
973 out.putShort(newUTF8("RuntimeVisibleAnnotations"));
974 anns.put(out);
975 }
976 if (ClassReader.ANNOTATIONS && ianns != null) {
977 out.putShort(newUTF8("RuntimeInvisibleAnnotations"));
978 ianns.put(out);
979 }
980 if (ClassReader.ANNOTATIONS && tanns != null) {
981 out.putShort(newUTF8("RuntimeVisibleTypeAnnotations"));
982 tanns.put(out);
983 }
984 if (ClassReader.ANNOTATIONS && itanns != null) {
985 out.putShort(newUTF8("RuntimeInvisibleTypeAnnotations"));
986 itanns.put(out);
987 }
988 if (attrs != null) {
989 attrs.put(this, null, 0, -1, -1, out);
990 }
991 if (invalidFrames) {
992 anns = null;
993 ianns = null;
994 attrs = null;
995 innerClassesCount = 0;
996 innerClasses = null;
997 bootstrapMethodsCount = 0;
998 bootstrapMethods = null;
999 firstField = null;
1000 lastField = null;
1001 firstMethod = null;
1002 lastMethod = null;
1003 computeMaxs = false;
1004 computeFrames = true;
1005 invalidFrames = false;
1006 new ClassReader(out.data).accept(this, ClassReader.SKIP_FRAMES);
1007 return toByteArray();
1008 }
1009 return out.data;
1010 }
1011
1012 // ------------------------------------------------------------------------
1013 // Utility methods: constant pool management
1014 // ------------------------------------------------------------------------
1015
1016 /**
1017 * Adds a number or string constant to the constant pool of the class being
1018 * build. Does nothing if the constant pool already contains a similar item.
1019 *
1020 * @param cst
1021 * the value of the constant to be added to the constant pool.
1022 * This parameter must be an {@link Integer}, a {@link Float}, a
1023 * {@link Long}, a {@link Double}, a {@link String} or a
1024 * {@link Type}.
1025 * @return a new or already existing constant item with the given value.
1026 */
1027 Item newConstItem(final Object cst) {
1028 if (cst instanceof Integer) {
1029 int val = ((Integer) cst).intValue();
1030 return newInteger(val);
1031 } else if (cst instanceof Byte) {
1032 int val = ((Byte) cst).intValue();
1033 return newInteger(val);
1034 } else if (cst instanceof Character) {
1035 int val = ((Character) cst).charValue();
1036 return newInteger(val);
1037 } else if (cst instanceof Short) {
1038 int val = ((Short) cst).intValue();
1039 return newInteger(val);
1040 } else if (cst instanceof Boolean) {
1041 int val = ((Boolean) cst).booleanValue() ? 1 : 0;
1042 return newInteger(val);
1043 } else if (cst instanceof Float) {
1044 float val = ((Float) cst).floatValue();
1045 return newFloat(val);
1046 } else if (cst instanceof Long) {
1047 long val = ((Long) cst).longValue();
1048 return newLong(val);
1049 } else if (cst instanceof Double) {
1050 double val = ((Double) cst).doubleValue();
1051 return newDouble(val);
1052 } else if (cst instanceof String) {
1053 return newString((String) cst);
1054 } else if (cst instanceof Type) {
1055 Type t = (Type) cst;
1056 int s = t.getSort();
1057 if (s == Type.OBJECT) {
1058 return newClassItem(t.getInternalName());
1059 } else if (s == Type.METHOD) {
1060 return newMethodTypeItem(t.getDescriptor());
1061 } else { // s == primitive type or array
1062 return newClassItem(t.getDescriptor());
1063 }
1064 } else if (cst instanceof Handle) {
1065 Handle h = (Handle) cst;
1066 return newHandleItem(h.tag, h.owner, h.name, h.desc);
1067 } else {
1068 throw new IllegalArgumentException("value " + cst);
1069 }
1070 }
1071
1072 /**
1073 * Adds a number or string constant to the constant pool of the class being
1074 * build. Does nothing if the constant pool already contains a similar item.
1075 * <i>This method is intended for {@link Attribute} sub classes, and is
1076 * normally not needed by class generators or adapters.</i>
1077 *
1078 * @param cst
1079 * the value of the constant to be added to the constant pool.
1080 * This parameter must be an {@link Integer}, a {@link Float}, a
1081 * {@link Long}, a {@link Double} or a {@link String}.
1082 * @return the index of a new or already existing constant item with the
1083 * given value.
1084 */
1085 public int newConst(final Object cst) {
1086 return newConstItem(cst).index;
1087 }
1088
1089 /**
1090 * Adds an UTF8 string to the constant pool of the class being build. Does
1091 * nothing if the constant pool already contains a similar item. <i>This
1092 * method is intended for {@link Attribute} sub classes, and is normally not
1093 * needed by class generators or adapters.</i>
1094 *
1095 * @param value
1096 * the String value.
1097 * @return the index of a new or already existing UTF8 item.
1098 */
1099 public int newUTF8(final String value) {
1100 key.set(UTF8, value, null, null);
1101 Item result = get(key);
1102 if (result == null) {
1103 pool.putByte(UTF8).putUTF8(value);
1104 result = new Item(index++, key);
1105 put(result);
1106 }
1107 return result.index;
1108 }
1109
1110 /**
1111 * Adds a class reference to the constant pool of the class being build.
1112 * Does nothing if the constant pool already contains a similar item.
1113 * <i>This method is intended for {@link Attribute} sub classes, and is
1114 * normally not needed by class generators or adapters.</i>
1115 *
1116 * @param value
1117 * the internal name of the class.
1118 * @return a new or already existing class reference item.
1119 */
1120 Item newClassItem(final String value) {
1121 key2.set(CLASS, value, null, null);
1122 Item result = get(key2);
1123 if (result == null) {
1124 pool.put12(CLASS, newUTF8(value));
1125 result = new Item(index++, key2);
1126 put(result);
1127 }
1128 return result;
1129 }
1130
1131 /**
1132 * Adds a class reference to the constant pool of the class being build.
1133 * Does nothing if the constant pool already contains a similar item.
1134 * <i>This method is intended for {@link Attribute} sub classes, and is
1135 * normally not needed by class generators or adapters.</i>
1136 *
1137 * @param value
1138 * the internal name of the class.
1139 * @return the index of a new or already existing class reference item.
1140 */
1141 public int newClass(final String value) {
1142 return newClassItem(value).index;
1143 }
1144
1145 /**
1146 * Adds a method type reference to the constant pool of the class being
1147 * build. Does nothing if the constant pool already contains a similar item.
1148 * <i>This method is intended for {@link Attribute} sub classes, and is
1149 * normally not needed by class generators or adapters.</i>
1150 *
1151 * @param methodDesc
1152 * method descriptor of the method type.
1153 * @return a new or already existing method type reference item.
1154 */
1155 Item newMethodTypeItem(final String methodDesc) {
1156 key2.set(MTYPE, methodDesc, null, null);
1157 Item result = get(key2);
1158 if (result == null) {
1159 pool.put12(MTYPE, newUTF8(methodDesc));
1160 result = new Item(index++, key2);
1161 put(result);
1162 }
1163 return result;
1164 }
1165
1166 /**
1167 * Adds a method type reference to the constant pool of the class being
1168 * build. Does nothing if the constant pool already contains a similar item.
1169 * <i>This method is intended for {@link Attribute} sub classes, and is
1170 * normally not needed by class generators or adapters.</i>
1171 *
1172 * @param methodDesc
1173 * method descriptor of the method type.
1174 * @return the index of a new or already existing method type reference
1175 * item.
1176 */
1177 public int newMethodType(final String methodDesc) {
1178 return newMethodTypeItem(methodDesc).index;
1179 }
1180
1181 /**
1182 * Adds a handle to the constant pool of the class being build. Does nothing
1183 * if the constant pool already contains a similar item. <i>This method is
1184 * intended for {@link Attribute} sub classes, and is normally not needed by
1185 * class generators or adapters.</i>
1186 *
1187 * @param tag
1188 * the kind of this handle. Must be {@link Opcodes#H_GETFIELD},
1189 * {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD},
1190 * {@link Opcodes#H_PUTSTATIC}, {@link Opcodes#H_INVOKEVIRTUAL},
1191 * {@link Opcodes#H_INVOKESTATIC},
1192 * {@link Opcodes#H_INVOKESPECIAL},
1193 * {@link Opcodes#H_NEWINVOKESPECIAL} or
1194 * {@link Opcodes#H_INVOKEINTERFACE}.
1195 * @param owner
1196 * the internal name of the field or method owner class.
1197 * @param name
1198 * the name of the field or method.
1199 * @param desc
1200 * the descriptor of the field or method.
1201 * @return a new or an already existing method type reference item.
1202 */
1203 Item newHandleItem(final int tag, final String owner, final String name,
1204 final String desc) {
1205 key4.set(HANDLE_BASE + tag, owner, name, desc);
1206 Item result = get(key4);
1207 if (result == null) {
1208 if (tag <= Opcodes.H_PUTSTATIC) {
1209 put112(HANDLE, tag, newField(owner, name, desc));
1210 } else {
1211 put112(HANDLE,
1212 tag,
1213 newMethod(owner, name, desc,
1214 tag == Opcodes.H_INVOKEINTERFACE));
1215 }
1216 result = new Item(index++, key4);
1217 put(result);
1218 }
1219 return result;
1220 }
1221
1222 /**
1223 * Adds a handle to the constant pool of the class being build. Does nothing
1224 * if the constant pool already contains a similar item. <i>This method is
1225 * intended for {@link Attribute} sub classes, and is normally not needed by
1226 * class generators or adapters.</i>
1227 *
1228 * @param tag
1229 * the kind of this handle. Must be {@link Opcodes#H_GETFIELD},
1230 * {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD},
1231 * {@link Opcodes#H_PUTSTATIC}, {@link Opcodes#H_INVOKEVIRTUAL},
1232 * {@link Opcodes#H_INVOKESTATIC},
1233 * {@link Opcodes#H_INVOKESPECIAL},
1234 * {@link Opcodes#H_NEWINVOKESPECIAL} or
1235 * {@link Opcodes#H_INVOKEINTERFACE}.
1236 * @param owner
1237 * the internal name of the field or method owner class.
1238 * @param name
1239 * the name of the field or method.
1240 * @param desc
1241 * the descriptor of the field or method.
1242 * @return the index of a new or already existing method type reference
1243 * item.
1244 */
1245 public int newHandle(final int tag, final String owner, final String name,
1246 final String desc) {
1247 return newHandleItem(tag, owner, name, desc).index;
1248 }
1249
1250 /**
1251 * Adds an invokedynamic reference to the constant pool of the class being
1252 * build. Does nothing if the constant pool already contains a similar item.
1253 * <i>This method is intended for {@link Attribute} sub classes, and is
1254 * normally not needed by class generators or adapters.</i>
1255 *
1256 * @param name
1257 * name of the invoked method.
1258 * @param desc
1259 * descriptor of the invoke method.
1260 * @param bsm
1261 * the bootstrap method.
1262 * @param bsmArgs
1263 * the bootstrap method constant arguments.
1264 *
1265 * @return a new or an already existing invokedynamic type reference item.
1266 */
1267 Item newInvokeDynamicItem(final String name, final String desc,
1268 final Handle bsm, final Object... bsmArgs) {
1269 // cache for performance
1270 ByteVector bootstrapMethods = this.bootstrapMethods;
1271 if (bootstrapMethods == null) {
1272 bootstrapMethods = this.bootstrapMethods = new ByteVector();
1273 }
1274
1275 int position = bootstrapMethods.length; // record current position
1276
1277 int hashCode = bsm.hashCode();
1278 bootstrapMethods.putShort(newHandle(bsm.tag, bsm.owner, bsm.name,
1279 bsm.desc));
1280
1281 int argsLength = bsmArgs.length;
1282 bootstrapMethods.putShort(argsLength);
1283
1284 for (int i = 0; i < argsLength; i++) {
1285 Object bsmArg = bsmArgs[i];
1286 hashCode ^= bsmArg.hashCode();
1287 bootstrapMethods.putShort(newConst(bsmArg));
1288 }
1289
1290 byte[] data = bootstrapMethods.data;
1291 int length = (1 + 1 + argsLength) << 1; // (bsm + argCount + arguments)
1292 hashCode &= 0x7FFFFFFF;
1293 Item result = items[hashCode % items.length];
1294 loop: while (result != null) {
1295 if (result.type != BSM || result.hashCode != hashCode) {
1296 result = result.next;
1297 continue;
1298 }
1299
1300 // because the data encode the size of the argument
1301 // we don't need to test if these size are equals
1302 int resultPosition = result.intVal;
1303 for (int p = 0; p < length; p++) {
1304 if (data[position + p] != data[resultPosition + p]) {
1305 result = result.next;
1306 continue loop;
1307 }
1308 }
1309 break;
1310 }
1311
1312 int bootstrapMethodIndex;
1313 if (result != null) {
1314 bootstrapMethodIndex = result.index;
1315 bootstrapMethods.length = position; // revert to old position
1316 } else {
1317 bootstrapMethodIndex = bootstrapMethodsCount++;
1318 result = new Item(bootstrapMethodIndex);
1319 result.set(position, hashCode);
1320 put(result);
1321 }
1322
1323 // now, create the InvokeDynamic constant
1324 key3.set(name, desc, bootstrapMethodIndex);
1325 result = get(key3);
1326 if (result == null) {
1327 put122(INDY, bootstrapMethodIndex, newNameType(name, desc));
1328 result = new Item(index++, key3);
1329 put(result);
1330 }
1331 return result;
1332 }
1333
1334 /**
1335 * Adds an invokedynamic reference to the constant pool of the class being
1336 * build. Does nothing if the constant pool already contains a similar item.
1337 * <i>This method is intended for {@link Attribute} sub classes, and is
1338 * normally not needed by class generators or adapters.</i>
1339 *
1340 * @param name
1341 * name of the invoked method.
1342 * @param desc
1343 * descriptor of the invoke method.
1344 * @param bsm
1345 * the bootstrap method.
1346 * @param bsmArgs
1347 * the bootstrap method constant arguments.
1348 *
1349 * @return the index of a new or already existing invokedynamic reference
1350 * item.
1351 */
1352 public int newInvokeDynamic(final String name, final String desc,
1353 final Handle bsm, final Object... bsmArgs) {
1354 return newInvokeDynamicItem(name, desc, bsm, bsmArgs).index;
1355 }
1356
1357 /**
1358 * Adds a field reference to the constant pool of the class being build.
1359 * Does nothing if the constant pool already contains a similar item.
1360 *
1361 * @param owner
1362 * the internal name of the field's owner class.
1363 * @param name
1364 * the field's name.
1365 * @param desc
1366 * the field's descriptor.
1367 * @return a new or already existing field reference item.
1368 */
1369 Item newFieldItem(final String owner, final String name, final String desc) {
1370 key3.set(FIELD, owner, name, desc);
1371 Item result = get(key3);
1372 if (result == null) {
1373 put122(FIELD, newClass(owner), newNameType(name, desc));
1374 result = new Item(index++, key3);
1375 put(result);
1376 }
1377 return result;
1378 }
1379
1380 /**
1381 * Adds a field reference to the constant pool of the class being build.
1382 * Does nothing if the constant pool already contains a similar item.
1383 * <i>This method is intended for {@link Attribute} sub classes, and is
1384 * normally not needed by class generators or adapters.</i>
1385 *
1386 * @param owner
1387 * the internal name of the field's owner class.
1388 * @param name
1389 * the field's name.
1390 * @param desc
1391 * the field's descriptor.
1392 * @return the index of a new or already existing field reference item.
1393 */
1394 public int newField(final String owner, final String name, final String desc) {
1395 return newFieldItem(owner, name, desc).index;
1396 }
1397
1398 /**
1399 * Adds a method reference to the constant pool of the class being build.
1400 * Does nothing if the constant pool already contains a similar item.
1401 *
1402 * @param owner
1403 * the internal name of the method's owner class.
1404 * @param name
1405 * the method's name.
1406 * @param desc
1407 * the method's descriptor.
1408 * @param itf
1409 * <tt>true</tt> if <tt>owner</tt> is an interface.
1410 * @return a new or already existing method reference item.
1411 */
1412 Item newMethodItem(final String owner, final String name,
1413 final String desc, final boolean itf) {
1414 int type = itf ? IMETH : METH;
1415 key3.set(type, owner, name, desc);
1416 Item result = get(key3);
1417 if (result == null) {
1418 put122(type, newClass(owner), newNameType(name, desc));
1419 result = new Item(index++, key3);
1420 put(result);
1421 }
1422 return result;
1423 }
1424
1425 /**
1426 * Adds a method reference to the constant pool of the class being build.
1427 * Does nothing if the constant pool already contains a similar item.
1428 * <i>This method is intended for {@link Attribute} sub classes, and is
1429 * normally not needed by class generators or adapters.</i>
1430 *
1431 * @param owner
1432 * the internal name of the method's owner class.
1433 * @param name
1434 * the method's name.
1435 * @param desc
1436 * the method's descriptor.
1437 * @param itf
1438 * <tt>true</tt> if <tt>owner</tt> is an interface.
1439 * @return the index of a new or already existing method reference item.
1440 */
1441 public int newMethod(final String owner, final String name,
1442 final String desc, final boolean itf) {
1443 return newMethodItem(owner, name, desc, itf).index;
1444 }
1445
1446 /**
1447 * Adds an integer to the constant pool of the class being build. Does
1448 * nothing if the constant pool already contains a similar item.
1449 *
1450 * @param value
1451 * the int value.
1452 * @return a new or already existing int item.
1453 */
1454 Item newInteger(final int value) {
1455 key.set(value);
1456 Item result = get(key);
1457 if (result == null) {
1458 pool.putByte(INT).putInt(value);
1459 result = new Item(index++, key);
1460 put(result);
1461 }
1462 return result;
1463 }
1464
1465 /**
1466 * Adds a float to the constant pool of the class being build. Does nothing
1467 * if the constant pool already contains a similar item.
1468 *
1469 * @param value
1470 * the float value.
1471 * @return a new or already existing float item.
1472 */
1473 Item newFloat(final float value) {
1474 key.set(value);
1475 Item result = get(key);
1476 if (result == null) {
1477 pool.putByte(FLOAT).putInt(key.intVal);
1478 result = new Item(index++, key);
1479 put(result);
1480 }
1481 return result;
1482 }
1483
1484 /**
1485 * Adds a long to the constant pool of the class being build. Does nothing
1486 * if the constant pool already contains a similar item.
1487 *
1488 * @param value
1489 * the long value.
1490 * @return a new or already existing long item.
1491 */
1492 Item newLong(final long value) {
1493 key.set(value);
1494 Item result = get(key);
1495 if (result == null) {
1496 pool.putByte(LONG).putLong(value);
1497 result = new Item(index, key);
1498 index += 2;
1499 put(result);
1500 }
1501 return result;
1502 }
1503
1504 /**
1505 * Adds a double to the constant pool of the class being build. Does nothing
1506 * if the constant pool already contains a similar item.
1507 *
1508 * @param value
1509 * the double value.
1510 * @return a new or already existing double item.
1511 */
1512 Item newDouble(final double value) {
1513 key.set(value);
1514 Item result = get(key);
1515 if (result == null) {
1516 pool.putByte(DOUBLE).putLong(key.longVal);
1517 result = new Item(index, key);
1518 index += 2;
1519 put(result);
1520 }
1521 return result;
1522 }
1523
1524 /**
1525 * Adds a string to the constant pool of the class being build. Does nothing
1526 * if the constant pool already contains a similar item.
1527 *
1528 * @param value
1529 * the String value.
1530 * @return a new or already existing string item.
1531 */
1532 private Item newString(final String value) {
1533 key2.set(STR, value, null, null);
1534 Item result = get(key2);
1535 if (result == null) {
1536 pool.put12(STR, newUTF8(value));
1537 result = new Item(index++, key2);
1538 put(result);
1539 }
1540 return result;
1541 }
1542
1543 /**
1544 * Adds a name and type to the constant pool of the class being build. Does
1545 * nothing if the constant pool already contains a similar item. <i>This
1546 * method is intended for {@link Attribute} sub classes, and is normally not
1547 * needed by class generators or adapters.</i>
1548 *
1549 * @param name
1550 * a name.
1551 * @param desc
1552 * a type descriptor.
1553 * @return the index of a new or already existing name and type item.
1554 */
1555 public int newNameType(final String name, final String desc) {
1556 return newNameTypeItem(name, desc).index;
1557 }
1558
1559 /**
1560 * Adds a name and type to the constant pool of the class being build. Does
1561 * nothing if the constant pool already contains a similar item.
1562 *
1563 * @param name
1564 * a name.
1565 * @param desc
1566 * a type descriptor.
1567 * @return a new or already existing name and type item.
1568 */
1569 Item newNameTypeItem(final String name, final String desc) {
1570 key2.set(NAME_TYPE, name, desc, null);
1571 Item result = get(key2);
1572 if (result == null) {
1573 put122(NAME_TYPE, newUTF8(name), newUTF8(desc));
1574 result = new Item(index++, key2);
1575 put(result);
1576 }
1577 return result;
1578 }
1579
1580 /**
1581 * Adds the given internal name to {@link #typeTable} and returns its index.
1582 * Does nothing if the type table already contains this internal name.
1583 *
1584 * @param type
1585 * the internal name to be added to the type table.
1586 * @return the index of this internal name in the type table.
1587 */
1588 int addType(final String type) {
1589 key.set(TYPE_NORMAL, type, null, null);
1590 Item result = get(key);
1591 if (result == null) {
1592 result = addType(key);
1593 }
1594 return result.index;
1595 }
1596
1597 /**
1598 * Adds the given "uninitialized" type to {@link #typeTable} and returns its
1599 * index. This method is used for UNINITIALIZED types, made of an internal
1600 * name and a bytecode offset.
1601 *
1602 * @param type
1603 * the internal name to be added to the type table.
1604 * @param offset
1605 * the bytecode offset of the NEW instruction that created this
1606 * UNINITIALIZED type value.
1607 * @return the index of this internal name in the type table.
1608 */
1609 int addUninitializedType(final String type, final int offset) {
1610 key.type = TYPE_UNINIT;
1611 key.intVal = offset;
1612 key.strVal1 = type;
1613 key.hashCode = 0x7FFFFFFF & (TYPE_UNINIT + type.hashCode() + offset);
1614 Item result = get(key);
1615 if (result == null) {
1616 result = addType(key);
1617 }
1618 return result.index;
1619 }
1620
1621 /**
1622 * Adds the given Item to {@link #typeTable}.
1623 *
1624 * @param item
1625 * the value to be added to the type table.
1626 * @return the added Item, which a new Item instance with the same value as
1627 * the given Item.
1628 */
1629 private Item addType(final Item item) {
1630 ++typeCount;
1631 Item result = new Item(typeCount, key);
1632 put(result);
1633 if (typeTable == null) {
1634 typeTable = new Item[16];
1635 }
1636 if (typeCount == typeTable.length) {
1637 Item[] newTable = new Item[2 * typeTable.length];
1638 System.arraycopy(typeTable, 0, newTable, 0, typeTable.length);
1639 typeTable = newTable;
1640 }
1641 typeTable[typeCount] = result;
1642 return result;
1643 }
1644
1645 /**
1646 * Returns the index of the common super type of the two given types. This
1647 * method calls {@link #getCommonSuperClass} and caches the result in the
1648 * {@link #items} hash table to speedup future calls with the same
1649 * parameters.
1650 *
1651 * @param type1
1652 * index of an internal name in {@link #typeTable}.
1653 * @param type2
1654 * index of an internal name in {@link #typeTable}.
1655 * @return the index of the common super type of the two given types.
1656 */
1657 int getMergedType(final int type1, final int type2) {
1658 key2.type = TYPE_MERGED;
1659 key2.longVal = type1 | (((long) type2) << 32);
1660 key2.hashCode = 0x7FFFFFFF & (TYPE_MERGED + type1 + type2);
1661 Item result = get(key2);
1662 if (result == null) {
1663 String t = typeTable[type1].strVal1;
1664 String u = typeTable[type2].strVal1;
1665 key2.intVal = addType(getCommonSuperClass(t, u));
1666 result = new Item((short) 0, key2);
1667 put(result);
1668 }
1669 return result.intVal;
1670 }
1671
1672 /**
1673 * Returns the common super type of the two given types. The default
1674 * implementation of this method <i>loads</i> the two given classes and uses
1675 * the java.lang.Class methods to find the common super class. It can be
1676 * overridden to compute this common super type in other ways, in particular
1677 * without actually loading any class, or to take into account the class
1678 * that is currently being generated by this ClassWriter, which can of
1679 * course not be loaded since it is under construction.
1680 *
1681 * @param type1
1682 * the internal name of a class.
1683 * @param type2
1684 * the internal name of another class.
1685 * @return the internal name of the common super class of the two given
1686 * classes.
1687 */
1688 protected String getCommonSuperClass(final String type1, final String type2) {
1689 Class<?> c, d;
1690 ClassLoader classLoader = getClass().getClassLoader();
1691 try {
1692 c = Class.forName(type1.replace('/', '.'), false, classLoader);
1693 d = Class.forName(type2.replace('/', '.'), false, classLoader);
1694 } catch (Exception e) {
1695 throw new RuntimeException(e.toString());
1696 }
1697 if (c.isAssignableFrom(d)) {
1698 return type1;
1699 }
1700 if (d.isAssignableFrom(c)) {
1701 return type2;
1702 }
1703 if (c.isInterface() || d.isInterface()) {
1704 return "java/lang/Object";
1705 } else {
1706 do {
1707 c = c.getSuperclass();
1708 } while (!c.isAssignableFrom(d));
1709 return c.getName().replace('.', '/');
1710 }
1711 }
1712
1713 /**
1714 * Returns the constant pool's hash table item which is equal to the given
1715 * item.
1716 *
1717 * @param key
1718 * a constant pool item.
1719 * @return the constant pool's hash table item which is equal to the given
1720 * item, or <tt>null</tt> if there is no such item.
1721 */
1722 private Item get(final Item key) {
1723 Item i = items[key.hashCode % items.length];
1724 while (i != null && (i.type != key.type || !key.isEqualTo(i))) {
1725 i = i.next;
1726 }
1727 return i;
1728 }
1729
1730 /**
1731 * Puts the given item in the constant pool's hash table. The hash table
1732 * <i>must</i> not already contains this item.
1733 *
1734 * @param i
1735 * the item to be added to the constant pool's hash table.
1736 */
1737 private void put(final Item i) {
1738 if (index + typeCount > threshold) {
1739 int ll = items.length;
1740 int nl = ll * 2 + 1;
1741 Item[] newItems = new Item[nl];
1742 for (int l = ll - 1; l >= 0; --l) {
1743 Item j = items[l];
1744 while (j != null) {
1745 int index = j.hashCode % newItems.length;
1746 Item k = j.next;
1747 j.next = newItems[index];
1748 newItems[index] = j;
1749 j = k;
1750 }
1751 }
1752 items = newItems;
1753 threshold = (int) (nl * 0.75);
1754 }
1755 int index = i.hashCode % items.length;
1756 i.next = items[index];
1757 items[index] = i;
1758 }
1759
1760 /**
1761 * Puts one byte and two shorts into the constant pool.
1762 *
1763 * @param b
1764 * a byte.
1765 * @param s1
1766 * a short.
1767 * @param s2
1768 * another short.
1769 */
1770 private void put122(final int b, final int s1, final int s2) {
1771 pool.put12(b, s1).putShort(s2);
1772 }
1773
1774 /**
1775 * Puts two bytes and one short into the constant pool.
1776 *
1777 * @param b1
1778 * a byte.
1779 * @param b2
1780 * another byte.
1781 * @param s
1782 * a short.
1783 */
1784 private void put112(final int b1, final int b2, final int s) {
1785 pool.put11(b1, b2).putShort(s);
1786 }
1787 }