Java > Open Source Codes > org > objectweb > asm > test > cases > Frames


1 /***
2  * ASM tests
3  * Copyright (c) 2002-2005 France Telecom
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  * notice, this list of conditions and the following disclaimer in the
13  * documentation and/or other materials provided with the distribution.
14  * 3. Neither the name of the copyright holders nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28  * THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 package org.objectweb.asm.test.cases;
31
32 import java.io.IOException ;
33
34 import org.objectweb.asm.ClassAdapter;
35 import org.objectweb.asm.ClassReader;
36 import org.objectweb.asm.ClassVisitor;
37 import org.objectweb.asm.ClassWriter;
38 import org.objectweb.asm.FieldVisitor;
39 import org.objectweb.asm.Label;
40 import org.objectweb.asm.MethodAdapter;
41 import org.objectweb.asm.MethodVisitor;
42
43 /**
44  * Generates classes with StackMap and StackMapTable attributes. Covers all
45  * frame (FULL, SAME, etc.) and frame element types (TOP, NULL, INTEGER, etc.).
46  * Also covers the V1_6 class version.
47  *
48  * @author Eric Bruneton
49  */
50 public class Frames extends Generator {
51
52     final static int M = ACC_STATIC;
53     final static String I1 = "Ljava/io/Serializable;";
54     final static String I2 = "Ljava/lang/Comparable;";
55
56     public void generate(final String dir) throws IOException {
57         byte[] b = dump();
58         ClassWriter cw = new ClassWriter(0);
59         ClassReader cr = new ClassReader(b);
60         cr.accept(new RenameAdapter(cw), ClassReader.EXPAND_FRAMES);
61
62         generate(dir, "pkg/FrameTable.class", b);
63         generate(dir, "pkg/FrameMap.class", cw.toByteArray());
64     }
65
66     public byte[] dump() {
67         ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
68         MethodVisitor mv;
69         FieldVisitor fv;
70
71         cw.visit(V1_6,
72                 ACC_PUBLIC + ACC_SUPER,
73                 "pkg/FrameTable",
74                 null,
75                 "java/lang/Object",
76                 null);
77
78         fv = cw.visitField(M, "long", "Ljava/lang/Long;", null, null);
79         fv.visitEnd();
80
81         fv = cw.visitField(M, "double", "Ljava/lang/Double;", null, null);
82         fv.visitEnd();
83
84         fv = cw.visitField(M, "number", "Ljava/lang/Number;", null, null);
85         fv.visitEnd();
86
87         fv = cw.visitField(M, "serializable", I1, null, null);
88         fv.visitEnd();
89
90         fv = cw.visitField(M, "comparable", I2, null, null);
91         fv.visitEnd();
92
93         fv = cw.visitField(M, "longArray", "[Ljava/lang/Long;", null, null);
94         fv.visitEnd();
95
96         fv = cw.visitField(M, "intArray", "[I", null, null);
97         fv.visitEnd();
98
99         fv = cw.visitField(M, "floatArray", "[F", null, null);
100         fv.visitEnd();
101
102         fv = cw.visitField(M, "objectArray", "[Ljava/lang/Object;", null, null);
103         fv.visitEnd();
104
105         mv = cw.visitMethod(ACC_PUBLIC,
106                 "<init>",
107                 "(Ljava/lang/Object;)V",
108                 null,
109                 null);
110         mv.visitCode();
111         mv.visitVarInsn(ALOAD, 0);
112         mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
113         mv.visitInsn(RETURN);
114         mv.visitMaxs(0, 0);
115         mv.visitEnd();
116
117         uninitializedThisType(cw);
118         uninitializedLocalType(cw);
119         uninitializedStackType(cw);
120         nullType(cw);
121         topType(cw);
122         arrayTypes(cw);
123
124         mergeTypes(cw);
125         mergeStackTypes(cw);
126         mergeNullArray(cw);
127
128         appendAndChopFrame(cw);
129         sameLocals1stackItemFrame(cw);
130         sameLocals1stackItemFrame2(cw);
131         sameLocals1stackItemFrameExtended(cw);
132         sameFrameExtended(cw);
133
134         deadCode(cw);
135
136         cw.visitEnd();
137
138         return cw.toByteArray();
139     }
140
141     private void uninitializedThisType(final ClassWriter cw) {
142         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
143                 "<init>",
144                 "(I)V",
145                 null,
146                 null);
147         mv.visitCode();
148         mv.visitVarInsn(ALOAD, 0);
149         Label l0 = new Label();
150         mv.visitLabel(l0);
151         mv.visitTypeInsn(NEW, "pkg/FrameTable");
152         mv.visitInsn(DUP);
153         mv.visitVarInsn(ILOAD, 1);
154         Label l1 = new Label();
155         mv.visitJumpInsn(IFNE, l1);
156         mv.visitInsn(ACONST_NULL);
157         Label l2 = new Label();
158         mv.visitJumpInsn(GOTO, l2);
159         mv.visitFrame(F_FULL,
160                 2,
161                 new Object [] { UNINITIALIZED_THIS, INTEGER },
162                 3,
163                 new Object [] { UNINITIALIZED_THIS, l0, l0 });
164         mv.visitLabel(l1);
165         mv.visitTypeInsn(NEW, "java/lang/Object");
166         mv.visitInsn(DUP);
167         mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
168         mv.visitFrame(F_FULL,
169                 2,
170                 new Object [] { UNINITIALIZED_THIS, INTEGER },
171                 4,
172                 new Object [] { UNINITIALIZED_THIS, l0, l0, "java/lang/Object" });
173         mv.visitLabel(l2);
174         mv.visitMethodInsn(INVOKESPECIAL,
175                 "pkg/FrameTable",
176                 "<init>",
177                 "(Ljava/lang/Object;)V");
178         mv.visitMethodInsn(INVOKESPECIAL,
179                 "pkg/FrameTable",
180                 "<init>",
181                 "(Ljava/lang/Object;)V");
182         mv.visitInsn(RETURN);
183         mv.visitMaxs(0, 0);
184         mv.visitEnd();
185     }
186
187     private void uninitializedLocalType(final ClassWriter cw) {
188         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
189                 "uninitializedLocalType",
190                 "(Z)V",
191                 null,
192                 null);
193         mv.visitCode();
194         Label l0 = new Label();
195         mv.visitLabel(l0);
196         mv.visitTypeInsn(NEW, "java/lang/Long");
197         mv.visitVarInsn(ASTORE, 2);
198         mv.visitVarInsn(ALOAD, 2);
199         mv.visitVarInsn(ILOAD, 1);
200         Label l1 = new Label();
201         mv.visitJumpInsn(IFEQ, l1);
202         mv.visitInsn(LCONST_0);
203         Label l2 = new Label();
204         mv.visitJumpInsn(GOTO, l2);
205         mv.visitFrame(F_FULL,
206                 3,
207                 new Object [] { "pkg/FrameTable", INTEGER, l0 },
208                 1,
209                 new Object [] { l0 });
210         mv.visitLabel(l1);
211         mv.visitInsn(LCONST_1);
212         mv.visitFrame(F_FULL,
213                 3,
214                 new Object [] { "pkg/FrameTable", INTEGER, l0 },
215                 2,
216                 new Object [] { l0, LONG });
217         mv.visitLabel(l2);
218         mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Long", "<init>", "(J)V");
219         mv.visitInsn(RETURN);
220         mv.visitMaxs(0, 0);
221         mv.visitEnd();
222     }
223
224     private void uninitializedStackType(final ClassWriter cw) {
225         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
226                 "uninitializedStackType",
227                 "(Z)V",
228                 null,
229                 null);
230         mv.visitCode();
231         Label l0 = new Label();
232         mv.visitLabel(l0);
233         mv.visitTypeInsn(NEW, "java/lang/Long");
234         mv.visitInsn(DUP);
235         mv.visitVarInsn(ILOAD, 1);
236         Label l1 = new Label();
237         mv.visitJumpInsn(IFEQ, l1);
238         mv.visitInsn(LCONST_0);
239         mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Long", "<init>", "(J)V");
240         Label l2 = new Label();
241         mv.visitJumpInsn(GOTO, l2);
242         mv.visitFrame(F_FULL,
243                 1,
244                 new Object [] { "pkg/FrameTable" },
245                 2,
246                 new Object [] { l0, l0 });
247         mv.visitLabel(l1);
248         mv.visitInsn(LCONST_1);
249         mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Long", "<init>", "(J)V");
250         mv.visitFrame(F_SAME1, 0, null, 1, new Object [] { "java/lang/Long" });
251         mv.visitLabel(l2);
252         mv.visitVarInsn(ASTORE, 2);
253         mv.visitInsn(RETURN);
254         mv.visitMaxs(0, 0);
255         mv.visitEnd();
256     }
257
258     private void nullType(final ClassWriter cw) {
259         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
260                 "nullType",
261                 "(Ljava/lang/String;Ljava/lang/String;)V",
262                 null,
263                 null);
264         mv.visitCode();
265         mv.visitInsn(ACONST_NULL);
266         mv.visitVarInsn(ASTORE, 2);
267         mv.visitVarInsn(ALOAD, 0);
268         mv.visitInsn(ACONST_NULL);
269         mv.visitVarInsn(ALOAD, 1);
270         Label l0 = new Label();
271         mv.visitJumpInsn(IFNONNULL, l0);
272         mv.visitVarInsn(ALOAD, 2);
273         Label l1 = new Label();
274         mv.visitJumpInsn(GOTO, l1);
275         mv.visitFrame(F_FULL, 3, new Object [] {
276             "pkg/FrameTable",
277             "java/lang/String",
278             NULL }, 2, new Object [] { "pkg/FrameTable", NULL });
279         mv.visitLabel(l0);
280         mv.visitVarInsn(ALOAD, 1);
281         mv.visitFrame(F_FULL, 3, new Object [] {
282             "pkg/FrameTable",
283             "java/lang/String",
284             NULL }, 3, new Object [] {
285             "pkg/FrameTable",
286             NULL,
287             "java/lang/String" });
288         mv.visitLabel(l1);
289         mv.visitMethodInsn(INVOKEVIRTUAL,
290                 "pkg/FrameTable",
291                 "nullType",
292                 "(Ljava/lang/String;Ljava/lang/String;)V");
293         mv.visitInsn(RETURN);
294         mv.visitMaxs(0, 0);
295         mv.visitEnd();
296     }
297
298     private void topType(final ClassWriter cw) {
299         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
300                 "topType",
301                 "(ZBCSIFJDLjava/lang/Object;)V",
302                 null,
303                 null);
304         mv.visitCode();
305         mv.visitVarInsn(ILOAD, 5);
306         mv.visitVarInsn(ISTORE, 13);
307         mv.visitVarInsn(ILOAD, 1);
308         Label l0 = new Label();
309         mv.visitJumpInsn(IFEQ, l0);
310         mv.visitInsn(RETURN);
311         mv.visitFrame(F_APPEND, 2, new Object [] { TOP, INTEGER }, 0, null);
312         mv.visitLabel(l0);
313         mv.visitInsn(RETURN);
314         mv.visitMaxs(0, 0);
315         mv.visitEnd();
316     }
317
318     private void arrayTypes(final ClassWriter cw) {
319         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
320                 "fullFrame",
321                 "(Ljava/lang/String;[[Z[B[C[S[I[F[J[D[Ljava/lang/Object;)V",
322                 null,
323                 null);
324         mv.visitCode();
325         mv.visitLdcInsn(new Long (11L));
326         mv.visitVarInsn(LSTORE, 11);
327         mv.visitLdcInsn(new Long (11L));
328         mv.visitVarInsn(LSTORE, 13);
329         mv.visitLdcInsn(new Long (11L));
330         mv.visitVarInsn(LSTORE, 15);
331         mv.visitLdcInsn(new Long (11L));
332         mv.visitVarInsn(LSTORE, 17);
333         mv.visitVarInsn(ALOAD, 1);
334         Label l0 = new Label();
335         mv.visitJumpInsn(IFNONNULL, l0);
336         mv.visitInsn(RETURN);
337         mv.visitFrame(F_FULL, 15, new Object [] {
338             "pkg/FrameTable",
339             "java/lang/String",
340             "[[Z",
341             "[B",
342             "[C",
343             "[S",
344             "[I",
345             "[F",
346             "[J",
347             "[D",
348             "[Ljava/lang/Object;",
349             LONG,
350             LONG,
351             LONG,
352             LONG }, 0, new Object [] {});
353         mv.visitLabel(l0);
354         mv.visitInsn(RETURN);
355         mv.visitMaxs(0, 0);
356         mv.visitEnd();
357     }
358
359     private void mergeTypes(final ClassWriter cw) {
360         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
361                 "mergeTypes",
362                 "(Z)V",
363                 null,
364                 null);
365         mv.visitCode();
366         Label l0 = new Label();
367         mv.visitFieldInsn(GETSTATIC,
368                 "pkg/FrameTable",
369                 "long",
370                 "Ljava/lang/Long;");
371         mv.visitVarInsn(ASTORE, 2);
372         mv.visitFieldInsn(GETSTATIC,
373                 "pkg/FrameTable",
374                 "number",
375                 "Ljava/lang/Number;");
376         mv.visitVarInsn(ASTORE, 3);
377         mv.visitFieldInsn(GETSTATIC,
378                 "pkg/FrameTable",
379                 "number",
380                 "Ljava/lang/Long;");
381         mv.visitVarInsn(ASTORE, 4);
382         mv.visitFieldInsn(GETSTATIC,
383                 "pkg/FrameTable",
384                 "comparable",
385                 "Ljava/lang/Comparable;");
386         mv.visitVarInsn(ASTORE, 5);
387         mv.visitInsn(ACONST_NULL);
388         mv.visitVarInsn(ASTORE, 6);
389         mv.visitFieldInsn(GETSTATIC,
390                 "pkg/FrameTable",
391                 "double",
392                 "Ljava/lang/Double;");
393         mv.visitVarInsn(ASTORE, 7);
394         mv.visitInsn(ICONST_0);
395         mv.visitVarInsn(ISTORE, 8);
396         mv.visitFieldInsn(GETSTATIC, "pkg/FrameTable", "intArray", "[I");
397         mv.visitVarInsn(ASTORE, 9);
398         mv.visitFieldInsn(GETSTATIC,
399                 "pkg/FrameTable",
400                 "double",
401                 "Ljava/lang/Double;");
402         mv.visitVarInsn(ASTORE, 10);
403         mv.visitInsn(ACONST_NULL);
404         mv.visitVarInsn(ASTORE, 11);
405
406         mv.visitFrame(F_FULL, 12, new Object [] {
407             "pkg/FrameTable",
408             INTEGER,
409             "java/lang/Number",
410             "java/lang/Number",
411             "java/lang/Number",
412             "java/lang/Object",
413             NULL,
414             "java/lang/Double",
415             TOP,
416             "java/lang/Object",
417             "java/lang/Object",
418             "[Ljava/lang/Object;" }, 0, null);
419         mv.visitLabel(l0);
420         mv.visitVarInsn(ALOAD, 11);
421         mv.visitInsn(ICONST_0);
422         mv.visitInsn(ACONST_NULL);
423         mv.visitInsn(AASTORE);
424
425         mv.visitFieldInsn(GETSTATIC,
426                 "pkg/FrameTable",
427                 "double",
428                 "Ljava/lang/Double;");
429         mv.visitVarInsn(ASTORE, 2);
430         mv.visitFieldInsn(GETSTATIC,
431                 "pkg/FrameTable",
432                 "double",
433                 "Ljava/lang/Double;");
434         mv.visitVarInsn(ASTORE, 3);
435         mv.visitFieldInsn(GETSTATIC,
436                 "pkg/FrameTable",
437                 "number",
438                 "Ljava/lang/Number;");
439         mv.visitVarInsn(ASTORE, 4);
440         mv.visitFieldInsn(GETSTATIC,
441                 "pkg/FrameTable",
442                 "serializable",
443                 "Ljava/io/Serializable;");
444         mv.visitVarInsn(ASTORE, 5);
445         mv.visitInsn(ACONST_NULL);
446         mv.visitVarInsn(ASTORE, 6);
447         mv.visitInsn(ACONST_NULL);
448         mv.visitVarInsn(ASTORE, 7);
449         mv.visitInsn(ACONST_NULL);
450         mv.visitVarInsn(ASTORE, 8);
451         mv.visitFieldInsn(GETSTATIC, "pkg/FrameTable", "floatArray", "[F");
452         mv.visitVarInsn(ASTORE, 9);
453         mv.visitFieldInsn(GETSTATIC, "pkg/FrameTable", "intArray", "[I");
454         mv.visitVarInsn(ASTORE, 10);
455         mv.visitInsn(ICONST_1);
456         mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
457         mv.visitVarInsn(ASTORE, 11);
458
459         mv.visitJumpInsn(GOTO, l0);
460         mv.visitMaxs(0, 0);
461         mv.visitEnd();
462     }
463
464     private void mergeStackTypes(final ClassWriter cw) {
465         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
466                 "mergeStackTypes",
467                 "(Z)V",
468                 null,
469                 null);
470         mv.visitCode();
471         mv.visitInsn(ICONST_0);
472         mv.visitInsn(ICONST_1);
473         mv.visitVarInsn(ILOAD, 1);
474         Label l0 = new Label();
475         mv.visitJumpInsn(IFEQ, l0);
476         mv.visitInsn(ICONST_0);
477         Label l1 = new Label();
478         mv.visitJumpInsn(GOTO, l1);
479         mv.visitFrame(F_FULL,
480                 1,
481                 new Object [] { "pkg/FrameTable" },
482                 2,
483                 new Object [] { INTEGER, INTEGER });
484         mv.visitLabel(l0);
485         mv.visitInsn(DUP);
486         mv.visitFrame(F_FULL,
487                 1,
488                 new Object [] { "pkg/FrameTable" },
489                 3,
490                 new Object [] { INTEGER, INTEGER, INTEGER });
491         mv.visitLabel(l1);
492         mv.visitInsn(RETURN);
493         mv.visitMaxs(0, 0);
494         mv.visitEnd();
495     }
496
497     private void mergeNullArray(final ClassWriter cw) {
498         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
499                 "mergeNullArray",
500                 "(Z)I",
501                 null,
502                 null);
503         mv.visitCode();
504         mv.visitVarInsn(ILOAD, 1);
505         Label l1 = new Label();
506         mv.visitJumpInsn(IFEQ, l1);
507         mv.visitInsn(ACONST_NULL);
508         mv.visitVarInsn(ASTORE, 2);
509         mv.visitVarInsn(ILOAD, 1);
510         Label l2 = new Label();
511         mv.visitJumpInsn(IFEQ, l2);
512         mv.visitFieldInsn(GETSTATIC,
513                 "pkg/FrameTable",
514                 "longArray",
515                 "[Ljava/lang/Long;");
516         mv.visitVarInsn(ASTORE, 2);
517         mv.visitFrame(F_APPEND,
518                 1,
519                 new Object [] { "[Ljava/lang/Long;" },
520                 0,
521                 null);
522         mv.visitLabel(l2);
523         mv.visitVarInsn(ALOAD, 2);
524         Label l3 = new Label();
525         mv.visitJumpInsn(IFNULL, l3);
526         mv.visitVarInsn(ALOAD, 2);
527         mv.visitInsn(ARRAYLENGTH);
528         Label l4 = new Label();
529         mv.visitJumpInsn(IFNE, l4);
530         mv.visitFrame(F_SAME, 0, null, 0, null);
531         mv.visitLabel(l3);
532         mv.visitInsn(ACONST_NULL);
533         mv.visitVarInsn(ASTORE, 3);
534         Label l5 = new Label();
535         mv.visitJumpInsn(GOTO, l5);
536         mv.visitFrame(F_SAME, 0, null, 0, null);
537         mv.visitLabel(l4);
538         mv.visitVarInsn(ALOAD, 2);
539         mv.visitInsn(ICONST_0);
540         mv.visitInsn(AALOAD);
541         mv.visitVarInsn(ASTORE, 3);
542         mv.visitVarInsn(ILOAD, 1);
543         mv.visitJumpInsn(IFNE, l5);
544         mv.visitInsn(ACONST_NULL);
545         mv.visitVarInsn(ASTORE, 3);
546         mv.visitFrame(F_SAME, 0, null, 0, null);
547         mv.visitLabel(l5);
548         mv.visitVarInsn(ILOAD, 1);
549         mv.visitInsn(IRETURN);
550         mv.visitFrame(F_CHOP, 1, null, 0, null);
551         mv.visitLabel(l1);
552         mv.visitVarInsn(ILOAD, 1);
553         mv.visitInsn(IRETURN);
554         mv.visitMaxs(0, 0);
555         mv.visitEnd();
556     }
557
558     private void appendAndChopFrame(final ClassWriter cw) {
559         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
560                 "appendAndChopFrame",
561                 "(I)V",
562                 null,
563                 null);
564         mv.visitCode();
565         mv.visitInsn(ICONST_0);
566         mv.visitVarInsn(ISTORE, 2);
567         mv.visitFrame(F_APPEND, 1, new Object [] { INTEGER }, 0, null);
568         Label l0 = new Label();
569         mv.visitLabel(l0);
570         mv.visitVarInsn(ILOAD, 2);
571         mv.visitVarInsn(ILOAD, 1);
572         Label l1 = new Label();
573         mv.visitJumpInsn(IF_ICMPGE, l1);
574         mv.visitIincInsn(2, 1);
575         mv.visitJumpInsn(GOTO, l0);
576         mv.visitFrame(F_CHOP, 1, null, 0, null);
577         mv.visitLabel(l1);
578         mv.visitInsn(RETURN);
579         mv.visitMaxs(0, 0);
580         mv.visitEnd();
581     }
582
583     private void sameLocals1stackItemFrame(final ClassWriter cw) {
584         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
585                 "sameLocals1stackItemFrame",
586                 "()I",
587                 null,
588                 null);
589         mv.visitCode();
590         Label l0 = new Label();
591         Label l1 = new Label();
592         mv.visitTryCatchBlock(l0, l1, l0, null);
593         mv.visitInsn(ICONST_0);
594         mv.visitInsn(IRETURN);
595         mv.visitFrame(F_SAME1,
596                 0,
597                 null,
598                 1,
599                 new Object [] { "java/lang/Throwable" });
600         mv.visitLabel(l0);
601         mv.visitVarInsn(ASTORE, 1);
602         mv.visitLabel(l1);
603         mv.visitInsn(ICONST_0);
604         mv.visitInsn(IRETURN);
605         mv.visitMaxs(0, 0);
606         mv.visitEnd();
607     }
608
609     private void sameLocals1stackItemFrame2(final ClassWriter cw) {
610         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
611                 "sameLocals1stackItemFrame2",
612                 "()V",
613                 null,
614                 null);
615         mv.visitCode();
616         Label l0 = new Label();
617         Label l1 = new Label();
618         Label l2 = new Label();
619         mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
620         Label l3 = new Label();
621         mv.visitTryCatchBlock(l0, l1, l3, null);
622         Label l4 = new Label();
623         mv.visitTryCatchBlock(l2, l4, l3, null);
624         Label l5 = new Label();
625         mv.visitTryCatchBlock(l3, l5, l3, null);
626         mv.visitLabel(l0);
627         mv.visitTypeInsn(NEW, "java/lang/Object");
628         mv.visitInsn(DUP);
629         mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
630         mv.visitVarInsn(ASTORE, 1);
631         mv.visitLabel(l1);
632         Label l6 = new Label();
633         mv.visitJumpInsn(GOTO, l6);
634         mv.visitFrame(F_SAME1,
635                 0,
636                 null,
637                 1,
638                 new Object [] { "java/lang/Exception" });
639         mv.visitLabel(l2);
640         mv.visitVarInsn(ASTORE, 2);
641         mv.visitLabel(l4);
642         mv.visitJumpInsn(GOTO, l6);
643         mv.visitFrame(F_SAME1,
644                 0,
645                 null,
646                 1,
647                 new Object [] { "java/lang/Throwable" });
648         mv.visitLabel(l3);
649         mv.visitVarInsn(ASTORE, 3);
650         mv.visitLabel(l5);
651         mv.visitVarInsn(ALOAD, 3);
652         mv.visitInsn(ATHROW);
653         mv.visitFrame(F_SAME, 0, null, 0, null);
654         mv.visitLabel(l6);
655         mv.visitInsn(RETURN);
656         mv.visitMaxs(0, 0);
657         mv.visitEnd();
658     }
659
660     private void sameLocals1stackItemFrameExtended(final ClassWriter cw) {
661         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
662                 "sameLocals1stackItemFrameExtended",
663                 "()I",
664                 null,
665                 null);
666         mv.visitCode();
667         Label l0 = new Label();
668         Label l1 = new Label();
669         Label l2 = new Label();
670         mv.visitTryCatchBlock(l0, l1, l2, null);
671         Label l3 = new Label();
672         mv.visitTryCatchBlock(l2, l3, l2, null);
673         mv.visitLabel(l0);
674         mv.visitLdcInsn(new Long (11L));
675         mv.visitVarInsn(LSTORE, 1);
676         mv.visitLdcInsn(new Long (11L));
677         mv.visitVarInsn(LSTORE, 3);
678         mv.visitLdcInsn(new Long (11L));
679         mv.visitVarInsn(LSTORE, 5);
680         mv.visitLdcInsn(new Long (11L));
681         mv.visitVarInsn(LSTORE, 7);
682         mv.visitLdcInsn(new Long (11L));
683         mv.visitVarInsn(LSTORE, 9);
684         mv.visitLdcInsn(new Long (11L));
685         mv.visitVarInsn(LSTORE, 11);
686         mv.visitLdcInsn(new Long (11L));
687         mv.visitVarInsn(LSTORE, 13);
688         mv.visitLdcInsn(new Long (11L));
689         mv.visitVarInsn(LSTORE, 15);
690         mv.visitLdcInsn(new Long (11L));
691         mv.visitVarInsn(LSTORE, 17);
692         mv.visitLdcInsn(new Long (11L));
693         mv.visitVarInsn(LSTORE, 19);
694         mv.visitLdcInsn(new Long (11L));
695         mv.visitVarInsn(LSTORE, 21);
696         mv.visitLdcInsn(new Long (11L));
697         mv.visitVarInsn(LSTORE, 23);
698         mv.visitLdcInsn(new Long (11L));
699         mv.visitVarInsn(LSTORE, 25);
700         mv.visitLabel(l1);
701         mv.visitInsn(ICONST_0);
702         mv.visitInsn(IRETURN);
703         mv.visitFrame(F_SAME1,
704                 0,
705                 null,
706                 1,
707                 new Object [] { "java/lang/Throwable" });
708         mv.visitLabel(l2);
709         mv.visitVarInsn(ASTORE, 27);
710         mv.visitLabel(l3);
711         mv.visitInsn(ICONST_0);
712         mv.visitInsn(IRETURN);
713         mv.visitMaxs(0, 0);
714         mv.visitEnd();
715     }
716
717     private void sameFrameExtended(final ClassWriter cw) {
718         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
719                 "sameFrameExtended",
720                 "(Z)V",
721                 null,
722                 null);
723         mv.visitCode();
724         mv.visitFrame(F_SAME, 0, null, 0, null);
725         Label l0 = new Label();
726         mv.visitLabel(l0);
727         mv.visitLdcInsn(new Long (11L));
728         mv.visitVarInsn(LSTORE, 2);
729         mv.visitLdcInsn(new Long (11L));
730         mv.visitVarInsn(LSTORE, 4);
731         mv.visitLdcInsn(new Long (11L));
732         mv.visitVarInsn(LSTORE, 6);
733         mv.visitLdcInsn(new Long (11L));
734         mv.visitVarInsn(LSTORE, 8);
735         mv.visitLdcInsn(new Long (11L));
736         mv.visitVarInsn(LSTORE, 10);
737         mv.visitLdcInsn(new Long (11L));
738         mv.visitVarInsn(LSTORE, 12);
739         mv.visitLdcInsn(new Long (11L));
740         mv.visitVarInsn(LSTORE, 14);
741         mv.visitLdcInsn(new Long (11L));
742         mv.visitVarInsn(LSTORE, 16);
743         mv.visitLdcInsn(new Long (11L));
744         mv.visitVarInsn(LSTORE, 18);
745         mv.visitLdcInsn(new Long (11L));
746         mv.visitVarInsn(LSTORE, 20);
747         mv.visitLdcInsn(new Long (11L));
748         mv.visitVarInsn(LSTORE, 22);
749         mv.visitLdcInsn(new Long (11L));
750         mv.visitVarInsn(LSTORE, 24);
751         mv.visitLdcInsn(new Long (11L));
752         mv.visitVarInsn(LSTORE, 26);
753         mv.visitVarInsn(ILOAD, 1);
754         Label l1 = new Label();
755         mv.visitJumpInsn(IFEQ, l1);
756         mv.visitInsn(RETURN);
757         mv.visitFrame(F_SAME, 0, null, 0, null);
758         mv.visitLabel(l1);
759         mv.visitJumpInsn(GOTO, l0);
760         mv.visitMaxs(0, 0);
761         mv.visitEnd();
762     }
763
764     private void deadCode(final ClassWriter cw) {
765         MethodVisitor mv = cw.visitMethod(ACC_PUBLIC,
766                 "deadCode",
767                 "(Z)V",
768                 null,
769                 null);
770         mv.visitCode();
771         Label l0 = new Label();
772         Label l1 = new Label();
773         Label l2 = new Label();
774         Label l3 = new Label();
775         mv.visitTryCatchBlock(l0, l1, l1, "java/lang/Exception");
776         mv.visitTryCatchBlock(l2, l3, l3, "java/lang/Exception");
777         mv.visitJumpInsn(GOTO, l2);
778         mv.visitFrame(F_SAME, 0, null, 0, null);
779         mv.visitLabel(l0);
780         mv.visitInsn(RETURN);
781         mv.visitFrame(F_SAME1,
782                 0,
783                 null,
784                 1,
785                 new Object [] { "java/lang/Exception" });
786         mv.visitLabel(l1);
787         mv.visitVarInsn(ASTORE, 2);
788         mv.visitInsn(RETURN);
789         mv.visitFrame(F_FULL,
790                 0,
791                 new Object [] { "pkg/FrameTable", INTEGER },
792                 0,
793                 null);
794         mv.visitLabel(l2);
795         mv.visitInsn(RETURN);
796         mv.visitFrame(F_SAME1,
797                 0,
798                 null,
799                 1,
800                 new Object [] { "java/lang/Exception" });
801         mv.visitLabel(l3);
802         mv.visitVarInsn(ASTORE, 2);
803         mv.visitInsn(RETURN);
804         mv.visitMaxs(0, 0);
805         mv.visitEnd();
806     }
807
808     /**
809      * Ad hoc class adapter used to rename the FrameTable class and to change
810      * its class version.
811      *
812      * @author Eric Bruneton
813      */
814     static class RenameAdapter extends ClassAdapter {
815
816         public RenameAdapter(final ClassVisitor cv) {
817             super(cv);
818         }
819
820         public void visit(
821             final int version,
822             final int access,
823             final String name,
824             final String signature,
825             final String superName,
826             final String [] interfaces)
827         {
828             super.visit(V1_5,
829                     access,
830                     "pkg/FrameMap",
831                     signature,
832                     superName,
833                     interfaces);
834         }
835
836         public MethodVisitor visitMethod(
837             final int access,
838             final String name,
839             final String desc,
840             final String signature,
841             final String [] exceptions)
842         {
843             return new MethodAdapter(super.visitMethod(access,
844                     name,
845                     desc,
846                     signature,
847                     exceptions))
848             {
849                 public void visitFrame(
850                     final int type,
851                     final int nLocal,
852                     final Object [] local,
853                     final int nStack,
854                     final Object [] stack)
855                 {
856                     Object [] clocal = new Object [local.length];
857                     for (int i = 0; i < clocal.length; ++i) {
858                         clocal[i] = local[i];
859                         if ("pkg/FrameTable".equals(clocal[i])) {
860                             clocal[i] = "pkg/FrameMap";
861                         }
862                     }
863                     Object [] cstack = new Object [stack.length];
864                     for (int i = 0; i < cstack.length; ++i) {
865                         cstack[i] = stack[i];
866                         if ("pkg/FrameTable".equals(cstack[i])) {
867                             cstack[i] = "pkg/FrameMap";
868                         }
869                     }
870                     super.visitFrame(type, nLocal, clocal, nStack, cstack);
871                 }
872
873                 public void visitTypeInsn(final int opcode, final String desc) {
874                     if (desc.equals("pkg/FrameTable")) {
875                         super.visitTypeInsn(opcode, "pkg/FrameMap");
876                     } else {
877                         super.visitTypeInsn(opcode, desc);
878                     }
879                 }
880
881                 public void visitMethodInsn(
882                     final int opcode,
883                     final String owner,
884                     final String name,
885                     final String desc)
886                 {
887                     if (owner.equals("pkg/FrameTable")) {
888                         super.visitMethodInsn(opcode,
889                                 "pkg/FrameMap",
890                                 name,
891                                 desc);
892                     } else {
893                         super.visitMethodInsn(opcode, owner, name, desc);
894                     }
895                 }
896             };
897         }
898     }
899 }
900

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