Source Code Cross Referenced for AnalyzerAdapter.java in  » Testing » Ejb3Unit » org » ejb3unit » asm » commons » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » Ejb3Unit » org.ejb3unit.asm.commons 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /***
002:         * ASM: a very small and fast Java bytecode manipulation framework
003:         * Copyright (c) 2000-2005 INRIA, France Telecom
004:         * All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         * 1. Redistributions of source code must retain the above copyright
010:         *    notice, this list of conditions and the following disclaimer.
011:         * 2. Redistributions in binary form must reproduce the above copyright
012:         *    notice, this list of conditions and the following disclaimer in the
013:         *    documentation and/or other materials provided with the distribution.
014:         * 3. Neither the name of the copyright holders nor the names of its
015:         *    contributors may be used to endorse or promote products derived from
016:         *    this software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
022:         * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
023:         * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
024:         * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
025:         * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
026:         * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
027:         * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
028:         * THE POSSIBILITY OF SUCH DAMAGE.
029:         */package org.ejb3unit.asm.commons;
030:
031:        import java.util.ArrayList;
032:        import java.util.HashMap;
033:        import java.util.List;
034:        import java.util.Map;
035:
036:        import org.ejb3unit.asm.Label;
037:        import org.ejb3unit.asm.MethodAdapter;
038:        import org.ejb3unit.asm.MethodVisitor;
039:        import org.ejb3unit.asm.Opcodes;
040:        import org.ejb3unit.asm.Type;
041:
042:        /**
043:         * A {@link MethodAdapter} that keeps track of stack map frame changes between
044:         * {@link #visitFrame(int, int, Object[], int, Object[]) visitFrame} calls. This
045:         * adapter must be used with the
046:         * {@link org.ejb3unit.asm.ClassReader#EXPAND_FRAMES} option. Each visit<i>XXX</i>
047:         * instruction delegates to the next visitor in the chain, if any, and then
048:         * simulates the effect of this instruction on the stack map frame, represented
049:         * by {@link #locals} and {@link #stack}. The next visitor in the chain can get
050:         * the state of the stack map frame <i>before</i> each instruction by reading
051:         * the value of these fields in its visit<i>XXX</i> methods (this requires a
052:         * reference to the AnalyzerAdapter that is before it in the chain).
053:         * 
054:         * @author Eric Bruneton
055:         */
056:        public class AnalyzerAdapter extends MethodAdapter {
057:
058:            /**
059:             * <code>List</code> of the local variable slots for current execution
060:             * frame. Primitive types are represented by {@link Opcodes#TOP},
061:             * {@link Opcodes#INTEGER}, {@link Opcodes#FLOAT}, {@link Opcodes#LONG},
062:             * {@link Opcodes#DOUBLE},{@link Opcodes#NULL} or
063:             * {@link Opcodes#UNINITIALIZED_THIS} (long and double are represented by a
064:             * two elements, the second one being TOP). Reference types are represented
065:             * by String objects (representing internal names, or type descriptors for
066:             * array types), and uninitialized types by Label objects (this label
067:             * designates the NEW instruction that created this uninitialized value).
068:             * This field is <tt>null</tt> for unreacheable instructions.
069:             */
070:            public List locals;
071:
072:            /**
073:             * <code>List</code> of the operand stack slots for current execution
074:             * frame. Primitive types are represented by {@link Opcodes#TOP},
075:             * {@link Opcodes#INTEGER}, {@link Opcodes#FLOAT}, {@link Opcodes#LONG},
076:             * {@link Opcodes#DOUBLE},{@link Opcodes#NULL} or
077:             * {@link Opcodes#UNINITIALIZED_THIS} (long and double are represented by a
078:             * two elements, the second one being TOP). Reference types are represented
079:             * by String objects (representing internal names, or type descriptors for
080:             * array types), and uninitialized types by Label objects (this label
081:             * designates the NEW instruction that created this uninitialized value).
082:             * This field is <tt>null</tt> for unreacheable instructions.
083:             */
084:            public List stack;
085:
086:            /**
087:             * The labels that designate the next instruction to be visited. May be
088:             * <tt>null</tt>.
089:             */
090:            private List labels;
091:
092:            /**
093:             * Information about uninitialized types in the current execution frame.
094:             * This map associates internal names to Label objects. Each label
095:             * designates a NEW instruction that created the currently uninitialized
096:             * types, and the associated internal name represents the NEW operand, i.e.
097:             * the final, initialized type value.
098:             */
099:            private Map uninitializedTypes;
100:
101:            /**
102:             * The maximum stack size of this method.
103:             */
104:            private int maxStack;
105:
106:            /**
107:             * The maximum number of local variables of this method.
108:             */
109:            private int maxLocals;
110:
111:            /**
112:             * Creates a new {@link AnalyzerAdapter}.
113:             * 
114:             * @param owner the owner's class name.
115:             * @param access the method's access flags (see {@link Opcodes}).
116:             * @param name the method's name.
117:             * @param desc the method's descriptor (see {@link Type Type}).
118:             * @param mv the method visitor to which this adapter delegates calls. May
119:             *        be <tt>null</tt>.
120:             */
121:            public AnalyzerAdapter(final String owner, final int access,
122:                    final String name, final String desc, final MethodVisitor mv) {
123:                super (mv);
124:                locals = new ArrayList();
125:                stack = new ArrayList();
126:                uninitializedTypes = new HashMap();
127:
128:                if ((access & Opcodes.ACC_STATIC) == 0) {
129:                    if (name.equals("<init>")) {
130:                        locals.add(Opcodes.UNINITIALIZED_THIS);
131:                    } else {
132:                        locals.add(owner);
133:                    }
134:                }
135:                Type[] types = Type.getArgumentTypes(desc);
136:                for (int i = 0; i < types.length; ++i) {
137:                    Type type = types[i];
138:                    switch (type.getSort()) {
139:                    case Type.BOOLEAN:
140:                    case Type.CHAR:
141:                    case Type.BYTE:
142:                    case Type.SHORT:
143:                    case Type.INT:
144:                        locals.add(Opcodes.INTEGER);
145:                        break;
146:                    case Type.FLOAT:
147:                        locals.add(Opcodes.FLOAT);
148:                        break;
149:                    case Type.LONG:
150:                        locals.add(Opcodes.LONG);
151:                        locals.add(Opcodes.TOP);
152:                        break;
153:                    case Type.DOUBLE:
154:                        locals.add(Opcodes.DOUBLE);
155:                        locals.add(Opcodes.TOP);
156:                        break;
157:                    case Type.ARRAY:
158:                        locals.add(types[i].getDescriptor());
159:                        break;
160:                    // case Type.OBJECT:
161:                    default:
162:                        locals.add(types[i].getInternalName());
163:                    }
164:                }
165:            }
166:
167:            public void visitFrame(final int type, final int nLocal,
168:                    final Object[] local, final int nStack, final Object[] stack) {
169:                if (type != Opcodes.F_NEW) { // uncompressed frame
170:                    throw new IllegalStateException(
171:                            "ClassReader.accept() should be called with EXPAND_FRAMES flag");
172:                }
173:
174:                if (mv != null) {
175:                    mv.visitFrame(type, nLocal, local, nStack, stack);
176:                }
177:
178:                if (this .locals != null) {
179:                    this .locals.clear();
180:                    this .stack.clear();
181:                } else {
182:                    this .locals = new ArrayList();
183:                    this .stack = new ArrayList();
184:                }
185:                visitFrameTypes(nLocal, local, this .locals);
186:                visitFrameTypes(nStack, stack, this .stack);
187:                maxStack = Math.max(maxStack, this .stack.size());
188:            }
189:
190:            private void visitFrameTypes(final int n, final Object[] types,
191:                    final List result) {
192:                for (int i = 0; i < n; ++i) {
193:                    Object type = types[i];
194:                    result.add(type);
195:                    if (type == Opcodes.LONG || type == Opcodes.DOUBLE) {
196:                        result.add(Opcodes.TOP);
197:                    }
198:                }
199:            }
200:
201:            public void visitInsn(final int opcode) {
202:                if (mv != null) {
203:                    mv.visitInsn(opcode);
204:                }
205:                execute(opcode, 0, null);
206:                if ((opcode >= Opcodes.IRETURN && opcode <= Opcodes.RETURN)
207:                        || opcode == Opcodes.ATHROW) {
208:                    this .locals = null;
209:                    this .stack = null;
210:                }
211:            }
212:
213:            public void visitIntInsn(final int opcode, final int operand) {
214:                if (mv != null) {
215:                    mv.visitIntInsn(opcode, operand);
216:                }
217:                execute(opcode, operand, null);
218:            }
219:
220:            public void visitVarInsn(final int opcode, final int var) {
221:                if (mv != null) {
222:                    mv.visitVarInsn(opcode, var);
223:                }
224:                execute(opcode, var, null);
225:            }
226:
227:            public void visitTypeInsn(final int opcode, final String desc) {
228:                if (opcode == Opcodes.NEW) {
229:                    if (labels == null) {
230:                        Label l = new Label();
231:                        labels = new ArrayList(3);
232:                        labels.add(l);
233:                        if (mv != null) {
234:                            mv.visitLabel(l);
235:                        }
236:                    }
237:                    for (int i = 0; i < labels.size(); ++i) {
238:                        uninitializedTypes.put(labels.get(i), desc);
239:                    }
240:                }
241:                if (mv != null) {
242:                    mv.visitTypeInsn(opcode, desc);
243:                }
244:                execute(opcode, 0, desc);
245:            }
246:
247:            public void visitFieldInsn(final int opcode, final String owner,
248:                    final String name, final String desc) {
249:                if (mv != null) {
250:                    mv.visitFieldInsn(opcode, owner, name, desc);
251:                }
252:                execute(opcode, 0, desc);
253:            }
254:
255:            public void visitMethodInsn(final int opcode, final String owner,
256:                    final String name, final String desc) {
257:                if (mv != null) {
258:                    mv.visitMethodInsn(opcode, owner, name, desc);
259:                }
260:                pop(desc);
261:                if (opcode != Opcodes.INVOKESTATIC) {
262:                    Object t = pop();
263:                    if (opcode == Opcodes.INVOKESPECIAL
264:                            && name.charAt(0) == '<') {
265:                        Object u;
266:                        if (t == Opcodes.UNINITIALIZED_THIS) {
267:                            u = owner;
268:                        } else {
269:                            u = uninitializedTypes.get(t);
270:                        }
271:                        for (int i = 0; i < locals.size(); ++i) {
272:                            if (locals.get(i) == t) {
273:                                locals.set(i, u);
274:                            }
275:                        }
276:                        for (int i = 0; i < stack.size(); ++i) {
277:                            if (stack.get(i) == t) {
278:                                stack.set(i, u);
279:                            }
280:                        }
281:                    }
282:                }
283:                pushDesc(desc);
284:                labels = null;
285:            }
286:
287:            public void visitJumpInsn(final int opcode, final Label label) {
288:                if (mv != null) {
289:                    mv.visitJumpInsn(opcode, label);
290:                }
291:                execute(opcode, 0, null);
292:                if (opcode == Opcodes.GOTO) {
293:                    this .locals = null;
294:                    this .stack = null;
295:                }
296:            }
297:
298:            public void visitLabel(final Label label) {
299:                if (mv != null) {
300:                    mv.visitLabel(label);
301:                }
302:                if (labels == null) {
303:                    labels = new ArrayList(3);
304:                }
305:                labels.add(label);
306:            }
307:
308:            public void visitLdcInsn(final Object cst) {
309:                if (mv != null) {
310:                    mv.visitLdcInsn(cst);
311:                }
312:                if (cst instanceof  Integer) {
313:                    push(Opcodes.INTEGER);
314:                } else if (cst instanceof  Long) {
315:                    push(Opcodes.LONG);
316:                    push(Opcodes.TOP);
317:                } else if (cst instanceof  Float) {
318:                    push(Opcodes.FLOAT);
319:                } else if (cst instanceof  Double) {
320:                    push(Opcodes.DOUBLE);
321:                    push(Opcodes.TOP);
322:                } else if (cst instanceof  String) {
323:                    push("java/lang/String");
324:                } else if (cst instanceof  Type) {
325:                    push("java/lang/Class");
326:                } else {
327:                    throw new IllegalArgumentException();
328:                }
329:                labels = null;
330:            }
331:
332:            public void visitIincInsn(final int var, final int increment) {
333:                if (mv != null) {
334:                    mv.visitIincInsn(var, increment);
335:                }
336:                execute(Opcodes.IINC, var, null);
337:            }
338:
339:            public void visitTableSwitchInsn(final int min, final int max,
340:                    final Label dflt, final Label labels[]) {
341:                if (mv != null) {
342:                    mv.visitTableSwitchInsn(min, max, dflt, labels);
343:                }
344:                execute(Opcodes.TABLESWITCH, 0, null);
345:                this .locals = null;
346:                this .stack = null;
347:            }
348:
349:            public void visitLookupSwitchInsn(final Label dflt,
350:                    final int keys[], final Label labels[]) {
351:                if (mv != null) {
352:                    mv.visitLookupSwitchInsn(dflt, keys, labels);
353:                }
354:                execute(Opcodes.LOOKUPSWITCH, 0, null);
355:                this .locals = null;
356:                this .stack = null;
357:            }
358:
359:            public void visitMultiANewArrayInsn(final String desc,
360:                    final int dims) {
361:                if (mv != null) {
362:                    mv.visitMultiANewArrayInsn(desc, dims);
363:                }
364:                execute(Opcodes.MULTIANEWARRAY, dims, desc);
365:            }
366:
367:            public void visitMaxs(final int maxStack, final int maxLocals) {
368:                if (mv != null) {
369:                    this .maxStack = Math.max(this .maxStack, maxStack);
370:                    this .maxLocals = Math.max(this .maxLocals, maxLocals);
371:                    mv.visitMaxs(this .maxStack, this .maxLocals);
372:                }
373:            }
374:
375:            // ------------------------------------------------------------------------
376:
377:            private Object get(final int local) {
378:                maxLocals = Math.max(maxLocals, local);
379:                return local < locals.size() ? locals.get(local) : Opcodes.TOP;
380:            }
381:
382:            private void set(final int local, final Object type) {
383:                maxLocals = Math.max(maxLocals, local);
384:                while (local >= locals.size()) {
385:                    locals.add(Opcodes.TOP);
386:                }
387:                locals.set(local, type);
388:            }
389:
390:            private void push(final Object type) {
391:                stack.add(type);
392:                maxStack = Math.max(maxStack, stack.size());
393:            }
394:
395:            private void pushDesc(final String desc) {
396:                int index = desc.charAt(0) == '(' ? desc.indexOf(')') + 1 : 0;
397:                switch (desc.charAt(index)) {
398:                case 'V':
399:                    return;
400:                case 'Z':
401:                case 'C':
402:                case 'B':
403:                case 'S':
404:                case 'I':
405:                    push(Opcodes.INTEGER);
406:                    return;
407:                case 'F':
408:                    push(Opcodes.FLOAT);
409:                    return;
410:                case 'J':
411:                    push(Opcodes.LONG);
412:                    push(Opcodes.TOP);
413:                    return;
414:                case 'D':
415:                    push(Opcodes.DOUBLE);
416:                    push(Opcodes.TOP);
417:                    return;
418:                case '[':
419:                    if (index == 0) {
420:                        push(desc);
421:                    } else {
422:                        push(desc.substring(index, desc.length()));
423:                    }
424:                    break;
425:                // case 'L':
426:                default:
427:                    if (index == 0) {
428:                        push(desc.substring(1, desc.length() - 1));
429:                    } else {
430:                        push(desc.substring(index + 1, desc.length() - 1));
431:                    }
432:                    return;
433:                }
434:            }
435:
436:            private Object pop() {
437:                return stack.remove(stack.size() - 1);
438:            }
439:
440:            private void pop(final int n) {
441:                int size = stack.size();
442:                int end = size - n;
443:                for (int i = size - 1; i >= end; --i) {
444:                    stack.remove(i);
445:                }
446:            }
447:
448:            private void pop(final String desc) {
449:                char c = desc.charAt(0);
450:                if (c == '(') {
451:                    int n = 0;
452:                    Type[] types = Type.getArgumentTypes(desc);
453:                    for (int i = 0; i < types.length; ++i) {
454:                        n += types[i].getSize();
455:                    }
456:                    pop(n);
457:                } else if (c == 'J' || c == 'D') {
458:                    pop(2);
459:                } else {
460:                    pop(1);
461:                }
462:            }
463:
464:            private void execute(final int opcode, final int iarg,
465:                    final String sarg) {
466:                if (this .locals == null) {
467:                    return;
468:                }
469:                Object t1, t2, t3, t4;
470:                switch (opcode) {
471:                case Opcodes.NOP:
472:                case Opcodes.INEG:
473:                case Opcodes.LNEG:
474:                case Opcodes.FNEG:
475:                case Opcodes.DNEG:
476:                case Opcodes.I2B:
477:                case Opcodes.I2C:
478:                case Opcodes.I2S:
479:                case Opcodes.GOTO:
480:                case Opcodes.RETURN:
481:                    break;
482:                case Opcodes.ACONST_NULL:
483:                    push(Opcodes.NULL);
484:                    break;
485:                case Opcodes.ICONST_M1:
486:                case Opcodes.ICONST_0:
487:                case Opcodes.ICONST_1:
488:                case Opcodes.ICONST_2:
489:                case Opcodes.ICONST_3:
490:                case Opcodes.ICONST_4:
491:                case Opcodes.ICONST_5:
492:                case Opcodes.BIPUSH:
493:                case Opcodes.SIPUSH:
494:                    push(Opcodes.INTEGER);
495:                    break;
496:                case Opcodes.LCONST_0:
497:                case Opcodes.LCONST_1:
498:                    push(Opcodes.LONG);
499:                    push(Opcodes.TOP);
500:                    break;
501:                case Opcodes.FCONST_0:
502:                case Opcodes.FCONST_1:
503:                case Opcodes.FCONST_2:
504:                    push(Opcodes.FLOAT);
505:                    break;
506:                case Opcodes.DCONST_0:
507:                case Opcodes.DCONST_1:
508:                    push(Opcodes.DOUBLE);
509:                    push(Opcodes.TOP);
510:                    break;
511:                case Opcodes.ILOAD:
512:                case Opcodes.FLOAD:
513:                case Opcodes.ALOAD:
514:                    push(get(iarg));
515:                    break;
516:                case Opcodes.LLOAD:
517:                case Opcodes.DLOAD:
518:                    push(get(iarg));
519:                    push(Opcodes.TOP);
520:                    break;
521:                case Opcodes.IALOAD:
522:                case Opcodes.BALOAD:
523:                case Opcodes.CALOAD:
524:                case Opcodes.SALOAD:
525:                    pop(2);
526:                    push(Opcodes.INTEGER);
527:                    break;
528:                case Opcodes.LALOAD:
529:                case Opcodes.D2L:
530:                    pop(2);
531:                    push(Opcodes.LONG);
532:                    push(Opcodes.TOP);
533:                    break;
534:                case Opcodes.FALOAD:
535:                    pop(2);
536:                    push(Opcodes.FLOAT);
537:                    break;
538:                case Opcodes.DALOAD:
539:                case Opcodes.L2D:
540:                    pop(2);
541:                    push(Opcodes.DOUBLE);
542:                    push(Opcodes.TOP);
543:                    break;
544:                case Opcodes.AALOAD:
545:                    pop(1);
546:                    t1 = pop();
547:                    pushDesc(((String) t1).substring(1));
548:                    break;
549:                case Opcodes.ISTORE:
550:                case Opcodes.FSTORE:
551:                case Opcodes.ASTORE:
552:                    t1 = pop();
553:                    set(iarg, t1);
554:                    if (iarg > 0) {
555:                        t2 = get(iarg - 1);
556:                        if (t2 == Opcodes.LONG || t2 == Opcodes.DOUBLE) {
557:                            set(iarg - 1, Opcodes.TOP);
558:                        }
559:                    }
560:                    break;
561:                case Opcodes.LSTORE:
562:                case Opcodes.DSTORE:
563:                    pop(1);
564:                    t1 = pop();
565:                    set(iarg, t1);
566:                    set(iarg + 1, Opcodes.TOP);
567:                    if (iarg > 0) {
568:                        t2 = get(iarg - 1);
569:                        if (t2 == Opcodes.LONG || t2 == Opcodes.DOUBLE) {
570:                            set(iarg - 1, Opcodes.TOP);
571:                        }
572:                    }
573:                    break;
574:                case Opcodes.IASTORE:
575:                case Opcodes.BASTORE:
576:                case Opcodes.CASTORE:
577:                case Opcodes.SASTORE:
578:                case Opcodes.FASTORE:
579:                case Opcodes.AASTORE:
580:                    pop(3);
581:                    break;
582:                case Opcodes.LASTORE:
583:                case Opcodes.DASTORE:
584:                    pop(4);
585:                    break;
586:                case Opcodes.POP:
587:                case Opcodes.IFEQ:
588:                case Opcodes.IFNE:
589:                case Opcodes.IFLT:
590:                case Opcodes.IFGE:
591:                case Opcodes.IFGT:
592:                case Opcodes.IFLE:
593:                case Opcodes.IRETURN:
594:                case Opcodes.FRETURN:
595:                case Opcodes.ARETURN:
596:                case Opcodes.TABLESWITCH:
597:                case Opcodes.LOOKUPSWITCH:
598:                case Opcodes.ATHROW:
599:                case Opcodes.MONITORENTER:
600:                case Opcodes.MONITOREXIT:
601:                case Opcodes.IFNULL:
602:                case Opcodes.IFNONNULL:
603:                    pop(1);
604:                    break;
605:                case Opcodes.POP2:
606:                case Opcodes.IF_ICMPEQ:
607:                case Opcodes.IF_ICMPNE:
608:                case Opcodes.IF_ICMPLT:
609:                case Opcodes.IF_ICMPGE:
610:                case Opcodes.IF_ICMPGT:
611:                case Opcodes.IF_ICMPLE:
612:                case Opcodes.IF_ACMPEQ:
613:                case Opcodes.IF_ACMPNE:
614:                case Opcodes.LRETURN:
615:                case Opcodes.DRETURN:
616:                    pop(2);
617:                    break;
618:                case Opcodes.DUP:
619:                    t1 = pop();
620:                    push(t1);
621:                    push(t1);
622:                    break;
623:                case Opcodes.DUP_X1:
624:                    t1 = pop();
625:                    t2 = pop();
626:                    push(t1);
627:                    push(t2);
628:                    push(t1);
629:                    break;
630:                case Opcodes.DUP_X2:
631:                    t1 = pop();
632:                    t2 = pop();
633:                    t3 = pop();
634:                    push(t1);
635:                    push(t3);
636:                    push(t2);
637:                    push(t1);
638:                    break;
639:                case Opcodes.DUP2:
640:                    t1 = pop();
641:                    t2 = pop();
642:                    push(t2);
643:                    push(t1);
644:                    push(t2);
645:                    push(t1);
646:                    break;
647:                case Opcodes.DUP2_X1:
648:                    t1 = pop();
649:                    t2 = pop();
650:                    t3 = pop();
651:                    push(t2);
652:                    push(t1);
653:                    push(t3);
654:                    push(t2);
655:                    push(t1);
656:                    break;
657:                case Opcodes.DUP2_X2:
658:                    t1 = pop();
659:                    t2 = pop();
660:                    t3 = pop();
661:                    t4 = pop();
662:                    push(t2);
663:                    push(t1);
664:                    push(t4);
665:                    push(t3);
666:                    push(t2);
667:                    push(t1);
668:                    break;
669:                case Opcodes.SWAP:
670:                    t1 = pop();
671:                    t2 = pop();
672:                    push(t1);
673:                    push(t2);
674:                    break;
675:                case Opcodes.IADD:
676:                case Opcodes.ISUB:
677:                case Opcodes.IMUL:
678:                case Opcodes.IDIV:
679:                case Opcodes.IREM:
680:                case Opcodes.IAND:
681:                case Opcodes.IOR:
682:                case Opcodes.IXOR:
683:                case Opcodes.ISHL:
684:                case Opcodes.ISHR:
685:                case Opcodes.IUSHR:
686:                case Opcodes.L2I:
687:                case Opcodes.D2I:
688:                case Opcodes.FCMPL:
689:                case Opcodes.FCMPG:
690:                    pop(2);
691:                    push(Opcodes.INTEGER);
692:                    break;
693:                case Opcodes.LADD:
694:                case Opcodes.LSUB:
695:                case Opcodes.LMUL:
696:                case Opcodes.LDIV:
697:                case Opcodes.LREM:
698:                case Opcodes.LAND:
699:                case Opcodes.LOR:
700:                case Opcodes.LXOR:
701:                    pop(4);
702:                    push(Opcodes.LONG);
703:                    push(Opcodes.TOP);
704:                    break;
705:                case Opcodes.FADD:
706:                case Opcodes.FSUB:
707:                case Opcodes.FMUL:
708:                case Opcodes.FDIV:
709:                case Opcodes.FREM:
710:                case Opcodes.L2F:
711:                case Opcodes.D2F:
712:                    pop(2);
713:                    push(Opcodes.FLOAT);
714:                    break;
715:                case Opcodes.DADD:
716:                case Opcodes.DSUB:
717:                case Opcodes.DMUL:
718:                case Opcodes.DDIV:
719:                case Opcodes.DREM:
720:                    pop(4);
721:                    push(Opcodes.DOUBLE);
722:                    push(Opcodes.TOP);
723:                    break;
724:                case Opcodes.LSHL:
725:                case Opcodes.LSHR:
726:                case Opcodes.LUSHR:
727:                    pop(3);
728:                    push(Opcodes.LONG);
729:                    push(Opcodes.TOP);
730:                    break;
731:                case Opcodes.IINC:
732:                    set(iarg, Opcodes.INTEGER);
733:                    break;
734:                case Opcodes.I2L:
735:                case Opcodes.F2L:
736:                    pop(1);
737:                    push(Opcodes.LONG);
738:                    push(Opcodes.TOP);
739:                    break;
740:                case Opcodes.I2F:
741:                    pop(1);
742:                    push(Opcodes.FLOAT);
743:                    break;
744:                case Opcodes.I2D:
745:                case Opcodes.F2D:
746:                    pop(1);
747:                    push(Opcodes.DOUBLE);
748:                    push(Opcodes.TOP);
749:                    break;
750:                case Opcodes.F2I:
751:                case Opcodes.ARRAYLENGTH:
752:                case Opcodes.INSTANCEOF:
753:                    pop(1);
754:                    push(Opcodes.INTEGER);
755:                    break;
756:                case Opcodes.LCMP:
757:                case Opcodes.DCMPL:
758:                case Opcodes.DCMPG:
759:                    pop(4);
760:                    push(Opcodes.INTEGER);
761:                    break;
762:                case Opcodes.JSR:
763:                case Opcodes.RET:
764:                    throw new RuntimeException("JSR/RET are not supported");
765:                case Opcodes.GETSTATIC:
766:                    pushDesc(sarg);
767:                    break;
768:                case Opcodes.PUTSTATIC:
769:                    pop(sarg);
770:                    break;
771:                case Opcodes.GETFIELD:
772:                    pop(1);
773:                    pushDesc(sarg);
774:                    break;
775:                case Opcodes.PUTFIELD:
776:                    pop(sarg);
777:                    pop();
778:                    break;
779:                case Opcodes.NEW:
780:                    push(labels.get(0));
781:                    break;
782:                case Opcodes.NEWARRAY:
783:                    pop();
784:                    switch (iarg) {
785:                    case Opcodes.T_BOOLEAN:
786:                        pushDesc("[Z");
787:                        break;
788:                    case Opcodes.T_CHAR:
789:                        pushDesc("[C");
790:                        break;
791:                    case Opcodes.T_BYTE:
792:                        pushDesc("[B");
793:                        break;
794:                    case Opcodes.T_SHORT:
795:                        pushDesc("[S");
796:                        break;
797:                    case Opcodes.T_INT:
798:                        pushDesc("[I");
799:                        break;
800:                    case Opcodes.T_FLOAT:
801:                        pushDesc("[F");
802:                        break;
803:                    case Opcodes.T_DOUBLE:
804:                        pushDesc("[D");
805:                        break;
806:                    // case Opcodes.T_LONG:
807:                    default:
808:                        pushDesc("[J");
809:                        break;
810:                    }
811:                    break;
812:                case Opcodes.ANEWARRAY:
813:                    pop();
814:                    if (sarg.charAt(0) == '[') {
815:                        pushDesc("[" + sarg);
816:                    } else {
817:                        pushDesc("[L" + sarg + ";");
818:                    }
819:                    break;
820:                case Opcodes.CHECKCAST:
821:                    pop();
822:                    if (sarg.charAt(0) == '[') {
823:                        pushDesc(sarg);
824:                    } else {
825:                        push(sarg);
826:                    }
827:                    break;
828:                // case Opcodes.MULTIANEWARRAY:
829:                default:
830:                    pop(iarg);
831:                    pushDesc(sarg);
832:                    break;
833:                }
834:                labels = null;
835:            }
836:        }
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