Source Code Cross Referenced for AdviceAdapter.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » asm » commons » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.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.drools.asm.commons;
030:
031:        import java.util.ArrayList;
032:        import java.util.HashMap;
033:
034:        import org.drools.asm.Label;
035:        import org.drools.asm.MethodVisitor;
036:        import org.drools.asm.Opcodes;
037:        import org.drools.asm.Type;
038:
039:        /**
040:         * A <code>MethodAdapter</code> to dispatch method body instruction
041:         * <p>
042:         * The behavior is like this:
043:         * <ol>
044:         * 
045:         * <li>as long as the INVOKESPECIAL for the object initialization has not been
046:         *     reached, every bytecode instruction is dispatched in the ctor code visitor</li>
047:         * 
048:         * <li>when this one is reached, it is only added in the ctor code visitor and
049:         *     a JP invoke is added</li>
050:         * <li>after that, only the other code visitor receives the instructions</li>
051:         * 
052:         * </ol>
053:         * 
054:         * @author Eugene Kuleshov
055:         * @author Eric Bruneton
056:         */
057:        public abstract class AdviceAdapter extends GeneratorAdapter implements 
058:                Opcodes {
059:            private static final Object THIS = new Object();
060:            private static final Object OTHER = new Object();
061:
062:            protected int methodAccess;
063:            protected String methodDesc;
064:
065:            private boolean constructor;
066:            private boolean super Initialized;
067:            private ArrayList stackFrame;
068:            private HashMap branches;
069:
070:            /**
071:             * Creates a new {@link AdviceAdapter}.
072:             * 
073:             * @param mv the method visitor to which this adapter delegates calls.
074:             * @param access the method's access flags (see {@link Opcodes}).
075:             * @param name the method's name.
076:             * @param desc the method's descriptor (see {@link Type Type}).
077:             */
078:            public AdviceAdapter(final MethodVisitor mv, final int access,
079:                    final String name, final String desc) {
080:                super (mv, access, name, desc);
081:                this .methodAccess = access;
082:                this .methodDesc = desc;
083:
084:                this .constructor = "<init>".equals(name);
085:                if (!this .constructor) {
086:                    this .super Initialized = true;
087:                    onMethodEnter();
088:                } else {
089:                    this .stackFrame = new ArrayList();
090:                    this .branches = new HashMap();
091:                }
092:            }
093:
094:            public void visitLabel(final Label label) {
095:                this .mv.visitLabel(label);
096:
097:                if (this .constructor && this .branches != null) {
098:                    final ArrayList frame = (ArrayList) this .branches
099:                            .get(label);
100:                    if (frame != null) {
101:                        this .stackFrame = frame;
102:                        this .branches.remove(label);
103:                    }
104:                }
105:            }
106:
107:            public void visitInsn(final int opcode) {
108:                if (this .constructor) {
109:                    switch (opcode) {
110:                    case RETURN: // empty stack
111:                        onMethodExit(opcode);
112:                        break;
113:
114:                    case IRETURN: // 1 before n/a after
115:                    case FRETURN: // 1 before n/a after
116:                    case ARETURN: // 1 before n/a after
117:                    case ATHROW: // 1 before n/a after
118:                        popValue();
119:                        popValue();
120:                        onMethodExit(opcode);
121:                        break;
122:
123:                    case LRETURN: // 2 before n/a after
124:                    case DRETURN: // 2 before n/a after
125:                        popValue();
126:                        popValue();
127:                        onMethodExit(opcode);
128:                        break;
129:
130:                    case NOP:
131:                    case LALOAD: // remove 2 add 2
132:                    case DALOAD: // remove 2 add 2
133:                    case LNEG:
134:                    case DNEG:
135:                    case FNEG:
136:                    case INEG:
137:                    case L2D:
138:                    case D2L:
139:                    case F2I:
140:                    case I2B:
141:                    case I2C:
142:                    case I2S:
143:                    case I2F:
144:                    case Opcodes.ARRAYLENGTH:
145:                        break;
146:
147:                    case ACONST_NULL:
148:                    case ICONST_M1:
149:                    case ICONST_0:
150:                    case ICONST_1:
151:                    case ICONST_2:
152:                    case ICONST_3:
153:                    case ICONST_4:
154:                    case ICONST_5:
155:                    case FCONST_0:
156:                    case FCONST_1:
157:                    case FCONST_2:
158:                    case F2L: // 1 before 2 after
159:                    case F2D:
160:                    case I2L:
161:                    case I2D:
162:                        pushValue(AdviceAdapter.OTHER);
163:                        break;
164:
165:                    case LCONST_0:
166:                    case LCONST_1:
167:                    case DCONST_0:
168:                    case DCONST_1:
169:                        pushValue(AdviceAdapter.OTHER);
170:                        pushValue(AdviceAdapter.OTHER);
171:                        break;
172:
173:                    case IALOAD: // remove 2 add 1
174:                    case FALOAD: // remove 2 add 1
175:                    case AALOAD: // remove 2 add 1
176:                    case BALOAD: // remove 2 add 1
177:                    case CALOAD: // remove 2 add 1
178:                    case SALOAD: // remove 2 add 1
179:                    case POP:
180:                    case IADD:
181:                    case FADD:
182:                    case ISUB:
183:                    case LSHL: // 3 before 2 after
184:                    case LSHR: // 3 before 2 after
185:                    case LUSHR: // 3 before 2 after
186:                    case L2I: // 2 before 1 after
187:                    case L2F: // 2 before 1 after
188:                    case D2I: // 2 before 1 after
189:                    case D2F: // 2 before 1 after
190:                    case FSUB:
191:                    case FMUL:
192:                    case FDIV:
193:                    case FREM:
194:                    case FCMPL: // 2 before 1 after
195:                    case FCMPG: // 2 before 1 after
196:                    case IMUL:
197:                    case IDIV:
198:                    case IREM:
199:                    case ISHL:
200:                    case ISHR:
201:                    case IUSHR:
202:                    case IAND:
203:                    case IOR:
204:                    case IXOR:
205:                    case MONITORENTER:
206:                    case MONITOREXIT:
207:                        popValue();
208:                        break;
209:
210:                    case POP2:
211:                    case LSUB:
212:                    case LMUL:
213:                    case LDIV:
214:                    case LREM:
215:                    case LADD:
216:                    case LAND:
217:                    case LOR:
218:                    case LXOR:
219:                    case DADD:
220:                    case DMUL:
221:                    case DSUB:
222:                    case DDIV:
223:                    case DREM:
224:                        popValue();
225:                        popValue();
226:                        break;
227:
228:                    case IASTORE:
229:                    case FASTORE:
230:                    case AASTORE:
231:                    case BASTORE:
232:                    case CASTORE:
233:                    case SASTORE:
234:                    case LCMP: // 4 before 1 after
235:                    case DCMPL:
236:                    case DCMPG:
237:                        popValue();
238:                        popValue();
239:                        popValue();
240:                        break;
241:
242:                    case LASTORE:
243:                    case DASTORE:
244:                        popValue();
245:                        popValue();
246:                        popValue();
247:                        popValue();
248:                        break;
249:
250:                    case DUP:
251:                        pushValue(peekValue());
252:                        break;
253:
254:                    case DUP_X1:
255:                        // TODO optimize this
256:                    {
257:                        final Object o1 = popValue();
258:                        final Object o2 = popValue();
259:                        pushValue(o1);
260:                        pushValue(o2);
261:                        pushValue(o1);
262:                    }
263:                        break;
264:
265:                    case DUP_X2:
266:                        // TODO optimize this
267:                    {
268:                        final Object o1 = popValue();
269:                        final Object o2 = popValue();
270:                        final Object o3 = popValue();
271:                        pushValue(o1);
272:                        pushValue(o3);
273:                        pushValue(o2);
274:                        pushValue(o1);
275:                    }
276:                        break;
277:
278:                    case DUP2:
279:                        // TODO optimize this
280:                    {
281:                        final Object o1 = popValue();
282:                        final Object o2 = popValue();
283:                        pushValue(o2);
284:                        pushValue(o1);
285:                        pushValue(o2);
286:                        pushValue(o1);
287:                    }
288:                        break;
289:
290:                    case DUP2_X1:
291:                        // TODO optimize this
292:                    {
293:                        final Object o1 = popValue();
294:                        final Object o2 = popValue();
295:                        final Object o3 = popValue();
296:                        pushValue(o2);
297:                        pushValue(o1);
298:                        pushValue(o3);
299:                        pushValue(o2);
300:                        pushValue(o1);
301:                    }
302:                        break;
303:
304:                    case DUP2_X2:
305:                        // TODO optimize this
306:                    {
307:                        final Object o1 = popValue();
308:                        final Object o2 = popValue();
309:                        final Object o3 = popValue();
310:                        final Object o4 = popValue();
311:                        pushValue(o2);
312:                        pushValue(o1);
313:                        pushValue(o4);
314:                        pushValue(o3);
315:                        pushValue(o2);
316:                        pushValue(o1);
317:                    }
318:                        break;
319:
320:                    case SWAP: {
321:                        final Object o1 = popValue();
322:                        final Object o2 = popValue();
323:                        pushValue(o1);
324:                        pushValue(o2);
325:                    }
326:                        break;
327:                    }
328:                } else {
329:                    switch (opcode) {
330:                    case RETURN:
331:                    case IRETURN:
332:                    case FRETURN:
333:                    case ARETURN:
334:                    case LRETURN:
335:                    case DRETURN:
336:                    case ATHROW:
337:                        onMethodExit(opcode);
338:                        break;
339:                    }
340:                }
341:                this .mv.visitInsn(opcode);
342:            }
343:
344:            public void visitVarInsn(final int opcode, final int var) {
345:                super .visitVarInsn(opcode, var);
346:
347:                if (this .constructor) {
348:                    switch (opcode) {
349:                    case ILOAD:
350:                    case FLOAD:
351:                        pushValue(AdviceAdapter.OTHER);
352:                        break;
353:                    case LLOAD:
354:                    case DLOAD:
355:                        pushValue(AdviceAdapter.OTHER);
356:                        pushValue(AdviceAdapter.OTHER);
357:                        break;
358:                    case ALOAD:
359:                        pushValue(var == 0 ? AdviceAdapter.THIS
360:                                : AdviceAdapter.OTHER);
361:                        break;
362:                    case ASTORE:
363:                    case ISTORE:
364:                    case FSTORE:
365:                        popValue();
366:                        break;
367:                    case LSTORE:
368:                    case DSTORE:
369:                        popValue();
370:                        popValue();
371:                        break;
372:                    }
373:                }
374:            }
375:
376:            public void visitFieldInsn(final int opcode, final String owner,
377:                    final String name, final String desc) {
378:                this .mv.visitFieldInsn(opcode, owner, name, desc);
379:
380:                if (this .constructor) {
381:                    final char c = desc.charAt(0);
382:                    final boolean longOrDouble = c == 'J' || c == 'D';
383:                    switch (opcode) {
384:                    case GETSTATIC:
385:                        pushValue(AdviceAdapter.OTHER);
386:                        if (longOrDouble) {
387:                            pushValue(AdviceAdapter.OTHER);
388:                        }
389:                        break;
390:                    case PUTSTATIC:
391:                        popValue();
392:                        if (longOrDouble) {
393:                            popValue();
394:                        }
395:                        break;
396:                    case PUTFIELD:
397:                        popValue();
398:                        if (longOrDouble) {
399:                            popValue();
400:                            popValue();
401:                        }
402:                        break;
403:                    // case GETFIELD:
404:                    default:
405:                        if (longOrDouble) {
406:                            pushValue(AdviceAdapter.OTHER);
407:                        }
408:                    }
409:                }
410:            }
411:
412:            public void visitIntInsn(final int opcode, final int operand) {
413:                this .mv.visitIntInsn(opcode, operand);
414:
415:                if (this .constructor) {
416:                    switch (opcode) {
417:                    case BIPUSH:
418:                    case SIPUSH:
419:                        pushValue(AdviceAdapter.OTHER);
420:                    }
421:                }
422:            }
423:
424:            public void visitLdcInsn(final Object cst) {
425:                this .mv.visitLdcInsn(cst);
426:
427:                if (this .constructor) {
428:                    pushValue(AdviceAdapter.OTHER);
429:                    if (cst instanceof  Double || cst instanceof  Long) {
430:                        pushValue(AdviceAdapter.OTHER);
431:                    }
432:                }
433:            }
434:
435:            public void visitMultiANewArrayInsn(final String desc,
436:                    final int dims) {
437:                this .mv.visitMultiANewArrayInsn(desc, dims);
438:
439:                if (this .constructor) {
440:                    for (int i = 0; i < dims; i++) {
441:                        popValue();
442:                    }
443:                    pushValue(AdviceAdapter.OTHER);
444:                }
445:            }
446:
447:            public void visitTypeInsn(final int opcode, final String name) {
448:                this .mv.visitTypeInsn(opcode, name);
449:
450:                // ANEWARRAY, CHECKCAST or INSTANCEOF don't change stack
451:                if (this .constructor && opcode == Opcodes.NEW) {
452:                    pushValue(AdviceAdapter.OTHER);
453:                }
454:            }
455:
456:            public void visitMethodInsn(final int opcode, final String owner,
457:                    final String name, final String desc) {
458:                this .mv.visitMethodInsn(opcode, owner, name, desc);
459:
460:                if (this .constructor) {
461:                    final Type[] types = Type.getArgumentTypes(desc);
462:                    for (int i = 0; i < types.length; i++) {
463:                        popValue();
464:                        if (types[i].getSize() == 2) {
465:                            popValue();
466:                        }
467:                    }
468:                    switch (opcode) {
469:                    // case INVOKESTATIC:
470:                    // break;
471:
472:                    case INVOKEINTERFACE:
473:                    case INVOKEVIRTUAL:
474:                        popValue(); // objectref
475:                        break;
476:
477:                    case INVOKESPECIAL:
478:                        final Object type = popValue(); // objectref
479:                        if (type == AdviceAdapter.THIS
480:                                && !this .super Initialized) {
481:                            onMethodEnter();
482:                            this .super Initialized = true;
483:                            // once super has been initialized it is no longer 
484:                            // necessary to keep track of stack state                        
485:                            this .constructor = false;
486:                        }
487:                        break;
488:                    }
489:
490:                    final Type returnType = Type.getReturnType(desc);
491:                    if (returnType != Type.VOID_TYPE) {
492:                        pushValue(AdviceAdapter.OTHER);
493:                        if (returnType.getSize() == 2) {
494:                            pushValue(AdviceAdapter.OTHER);
495:                        }
496:                    }
497:                }
498:            }
499:
500:            public void visitJumpInsn(final int opcode, final Label label) {
501:                this .mv.visitJumpInsn(opcode, label);
502:
503:                if (this .constructor) {
504:                    switch (opcode) {
505:                    case IFEQ:
506:                    case IFNE:
507:                    case IFLT:
508:                    case IFGE:
509:                    case IFGT:
510:                    case IFLE:
511:                    case IFNULL:
512:                    case IFNONNULL:
513:                        popValue();
514:                        break;
515:
516:                    case IF_ICMPEQ:
517:                    case IF_ICMPNE:
518:                    case IF_ICMPLT:
519:                    case IF_ICMPGE:
520:                    case IF_ICMPGT:
521:                    case IF_ICMPLE:
522:                    case IF_ACMPEQ:
523:                    case IF_ACMPNE:
524:                        popValue();
525:                        popValue();
526:                        break;
527:
528:                    case JSR:
529:                        pushValue(AdviceAdapter.OTHER);
530:                        break;
531:                    }
532:                    addBranch(label);
533:                }
534:            }
535:
536:            public void visitLookupSwitchInsn(final Label dflt,
537:                    final int[] keys, final Label[] labels) {
538:                this .mv.visitLookupSwitchInsn(dflt, keys, labels);
539:
540:                if (this .constructor) {
541:                    popValue();
542:                    addBranches(dflt, labels);
543:                }
544:            }
545:
546:            public void visitTableSwitchInsn(final int min, final int max,
547:                    final Label dflt, final Label[] labels) {
548:                this .mv.visitTableSwitchInsn(min, max, dflt, labels);
549:
550:                if (this .constructor) {
551:                    popValue();
552:                    addBranches(dflt, labels);
553:                }
554:            }
555:
556:            private void addBranches(final Label dflt, final Label[] labels) {
557:                addBranch(dflt);
558:                for (int i = 0; i < labels.length; i++) {
559:                    addBranch(labels[i]);
560:                }
561:            }
562:
563:            private void addBranch(final Label label) {
564:                if (this .branches.containsKey(label)) {
565:                    return;
566:                }
567:                final ArrayList frame = new ArrayList();
568:                frame.addAll(this .stackFrame);
569:                this .branches.put(label, frame);
570:            }
571:
572:            private Object popValue() {
573:                return this .stackFrame.remove(this .stackFrame.size() - 1);
574:            }
575:
576:            private Object peekValue() {
577:                return this .stackFrame.get(this .stackFrame.size() - 1);
578:            }
579:
580:            private void pushValue(final Object o) {
581:                this .stackFrame.add(o);
582:            }
583:
584:            /**
585:             * Called at the beginning of the method or after super 
586:             * class class call in the constructor.
587:             * <br><br>
588:             * 
589:             * <i>Custom code can use or change all the local variables,
590:             * but should not change state of the stack.</i>
591:             */
592:            protected abstract void onMethodEnter();
593:
594:            /**
595:             * Called before explicit exit from the method using either
596:             * return or throw. Top element on the stack contains the 
597:             * return value or exception instance. For example:
598:             * 
599:             * <pre>
600:             *   public void onMethodExit(int opcode) {
601:             *     if(opcode==RETURN) {
602:             *         visitInsn(ACONST_NULL);
603:             *     } else if(opcode==ARETURN || opcode==ATHROW) {
604:             *         dup();
605:             *     } else {
606:             *         if(opcode==LRETURN || opcode==DRETURN) {
607:             *             dup2();
608:             *         } else {
609:             *             dup();
610:             *         }
611:             *         box(Type.getReturnType(this.methodDesc));
612:             *     }
613:             *     visitIntInsn(SIPUSH, opcode);
614:             *     visitMethodInsn(INVOKESTATIC, owner, "onExit", "(Ljava/lang/Object;I)V");
615:             *   }
616:             *
617:             *   // an actual call back method
618:             *   public static void onExit(int opcode, Object param) {
619:             *     ...
620:             * </pre>
621:             * 
622:             * <br><br>
623:             * 
624:             * <i>Custom code can use or change all the local variables,
625:             * but should not change state of the stack.</i>
626:             * 
627:             * @param opcode one of the RETURN, IRETURN, FRETURN, 
628:             *   ARETURN, LRETURN, DRETURN or ATHROW
629:             * 
630:             */
631:            protected abstract void onMethodExit(int opcode);
632:
633:            // TODO onException, onMethodCall
634:
635:        }
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