Source Code Cross Referenced for TraceClassVisitor.java in  » Rule-Engine » drolls-Rule-Engine » org » drools » asm » util » 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.util 
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.util;
030:
031:        import java.io.FileInputStream;
032:        import java.io.PrintWriter;
033:
034:        import org.drools.asm.AnnotationVisitor;
035:        import org.drools.asm.Attribute;
036:        import org.drools.asm.ClassReader;
037:        import org.drools.asm.ClassVisitor;
038:        import org.drools.asm.FieldVisitor;
039:        import org.drools.asm.MethodVisitor;
040:        import org.drools.asm.Opcodes;
041:        import org.drools.asm.signature.SignatureReader;
042:
043:        /**
044:         * A {@link ClassVisitor} that prints a disassembled view of the classes it
045:         * visits. This class visitor can be used alone (see the {@link #main main}
046:         * method) to disassemble a class. It can also be used in the middle of class
047:         * visitor chain to trace the class that is visited at a given point in this
048:         * chain. This may be uselful for debugging purposes. <p> The trace printed when
049:         * visiting the <tt>Hello</tt> class is the following: <p> <blockquote>
050:         * 
051:         * <pre>
052:         * // class version 49.0 (49)
053:         * // access flags 33
054:         * public class Hello {
055:         *
056:         *  // compiled from: Hello.java
057:         *
058:         *   // access flags 1
059:         *   public &lt;init&gt; ()V
060:         *     ALOAD 0
061:         *     INVOKESPECIAL java/lang/Object &lt;init&gt; ()V
062:         *     RETURN
063:         *     MAXSTACK = 1
064:         *     MAXLOCALS = 1
065:         *
066:         *   // access flags 9
067:         *   public static main ([Ljava/lang/String;)V
068:         *     GETSTATIC java/lang/System out Ljava/io/PrintStream;
069:         *     LDC &quot;hello&quot;
070:         *     INVOKEVIRTUAL java/io/PrintStream println (Ljava/lang/String;)V
071:         *     RETURN
072:         *     MAXSTACK = 2
073:         *     MAXLOCALS = 1
074:         * }
075:         * </pre>
076:         * 
077:         * </blockquote> where <tt>Hello</tt> is defined by: <p> <blockquote>
078:         * 
079:         * <pre>
080:         * public class Hello {
081:         *
082:         *     public static void main(String[] args) {
083:         *         System.out.println(&quot;hello&quot;);
084:         *     }
085:         * }
086:         * </pre>
087:         * 
088:         * </blockquote>
089:         * 
090:         * @author Eric Bruneton
091:         * @author Eugene Kuleshov
092:         */
093:        public class TraceClassVisitor extends TraceAbstractVisitor implements 
094:                ClassVisitor {
095:
096:            /**
097:             * The {@link ClassVisitor} to which this visitor delegates calls. May be
098:             * <tt>null</tt>.
099:             */
100:            protected final ClassVisitor cv;
101:
102:            /**
103:             * The print writer to be used to print the class.
104:             */
105:            protected final PrintWriter pw;
106:
107:            /**
108:             * Prints a disassembled view of the given class to the standard output. <p>
109:             * Usage: TraceClassVisitor [-debug] &lt;fully qualified class name or class
110:             * file name &gt;
111:             * 
112:             * @param args the command line arguments.
113:             * 
114:             * @throws Exception if the class cannot be found, or if an IO exception
115:             *         occurs.
116:             */
117:            public static void main(final String[] args) throws Exception {
118:                int i = 0;
119:                boolean skipDebug = true;
120:
121:                boolean ok = true;
122:                if (args.length < 1 || args.length > 2) {
123:                    ok = false;
124:                }
125:                if (ok && args[0].equals("-debug")) {
126:                    i = 1;
127:                    skipDebug = false;
128:                    if (args.length != 2) {
129:                        ok = false;
130:                    }
131:                }
132:                if (!ok) {
133:                    System.err
134:                            .println("Prints a disassembled view of the given class.");
135:                    System.err
136:                            .println("Usage: TraceClassVisitor [-debug] "
137:                                    + "<fully qualified class name or class file name>");
138:                    return;
139:                }
140:                ClassReader cr;
141:                if (args[i].endsWith(".class") || args[i].indexOf('\\') > -1
142:                        || args[i].indexOf('/') > -1) {
143:                    cr = new ClassReader(new FileInputStream(args[i]));
144:                } else {
145:                    cr = new ClassReader(args[i]);
146:                }
147:                cr.accept(new TraceClassVisitor(new PrintWriter(System.out)),
148:                        getDefaultAttributes(), skipDebug);
149:            }
150:
151:            /**
152:             * Constructs a new {@link TraceClassVisitor}.
153:             * 
154:             * @param pw the print writer to be used to print the class.
155:             */
156:            public TraceClassVisitor(final PrintWriter pw) {
157:                this (null, pw);
158:            }
159:
160:            /**
161:             * Constructs a new {@link TraceClassVisitor}.
162:             * 
163:             * @param cv the {@link ClassVisitor} to which this visitor delegates calls.
164:             *        May be <tt>null</tt>.
165:             * @param pw the print writer to be used to print the class.
166:             */
167:            public TraceClassVisitor(final ClassVisitor cv, final PrintWriter pw) {
168:                this .cv = cv;
169:                this .pw = pw;
170:            }
171:
172:            // ------------------------------------------------------------------------
173:            // Implementation of the ClassVisitor interface
174:            // ------------------------------------------------------------------------
175:
176:            public void visit(final int version, final int access,
177:                    final String name, final String signature,
178:                    final String super Name, final String[] interfaces) {
179:                final int major = version & 0xFFFF;
180:                final int minor = version >>> 16;
181:                this .buf.setLength(0);
182:                this .buf.append("// class version ").append(major).append('.')
183:                        .append(minor).append(" (").append(version).append(
184:                                ")\n");
185:                if ((access & Opcodes.ACC_DEPRECATED) != 0) {
186:                    this .buf.append("// DEPRECATED\n");
187:                }
188:                this .buf.append("// access flags ").append(access).append('\n');
189:
190:                appendDescriptor(TraceAbstractVisitor.CLASS_SIGNATURE,
191:                        signature);
192:                if (signature != null) {
193:                    final TraceSignatureVisitor sv = new TraceSignatureVisitor(
194:                            access);
195:                    final SignatureReader r = new SignatureReader(signature);
196:                    r.accept(sv);
197:                    this .buf.append("// declaration: ").append(name).append(
198:                            sv.getDeclaration()).append('\n');
199:                }
200:
201:                appendAccess(access & ~Opcodes.ACC_SUPER);
202:                if ((access & Opcodes.ACC_ANNOTATION) != 0) {
203:                    this .buf.append("@interface ");
204:                } else if ((access & Opcodes.ACC_INTERFACE) != 0) {
205:                    this .buf.append("interface ");
206:                } else if ((access & Opcodes.ACC_ENUM) != 0) {
207:                    this .buf.append("enum ");
208:                } else {
209:                    this .buf.append("class ");
210:                }
211:                appendDescriptor(TraceAbstractVisitor.INTERNAL_NAME, name);
212:
213:                if (super Name != null && !super Name.equals("java/lang/Object")) {
214:                    this .buf.append(" extends ");
215:                    appendDescriptor(TraceAbstractVisitor.INTERNAL_NAME,
216:                            super Name);
217:                    this .buf.append(' ');
218:                }
219:                if (interfaces != null && interfaces.length > 0) {
220:                    this .buf.append(" implements ");
221:                    for (int i = 0; i < interfaces.length; ++i) {
222:                        appendDescriptor(TraceAbstractVisitor.INTERNAL_NAME,
223:                                interfaces[i]);
224:                        this .buf.append(' ');
225:                    }
226:                }
227:                this .buf.append(" {\n\n");
228:
229:                this .text.add(this .buf.toString());
230:
231:                if (this .cv != null) {
232:                    this .cv.visit(version, access, name, signature, super Name,
233:                            interfaces);
234:                }
235:            }
236:
237:            public void visitSource(final String file, final String debug) {
238:                this .buf.setLength(0);
239:                if (file != null) {
240:                    this .buf.append(this .tab).append("// compiled from: ")
241:                            .append(file).append('\n');
242:                }
243:                if (debug != null) {
244:                    this .buf.append(this .tab).append("// debug info: ").append(
245:                            debug).append('\n');
246:                }
247:                if (this .buf.length() > 0) {
248:                    this .text.add(this .buf.toString());
249:                }
250:
251:                if (this .cv != null) {
252:                    this .cv.visitSource(file, debug);
253:                }
254:            }
255:
256:            public void visitOuterClass(final String owner, final String name,
257:                    final String desc) {
258:                this .buf.setLength(0);
259:                this .buf.append(this .tab).append("OUTERCLASS ");
260:                appendDescriptor(TraceAbstractVisitor.INTERNAL_NAME, owner);
261:                // if enclosing name is null, so why should we show this info?
262:                if (name != null) {
263:                    this .buf.append(' ').append(name).append(' ');
264:                } else {
265:                    this .buf.append(' ');
266:                }
267:                appendDescriptor(TraceAbstractVisitor.METHOD_DESCRIPTOR, desc);
268:                this .buf.append('\n');
269:                this .text.add(this .buf.toString());
270:
271:                if (this .cv != null) {
272:                    this .cv.visitOuterClass(owner, name, desc);
273:                }
274:            }
275:
276:            public AnnotationVisitor visitAnnotation(final String desc,
277:                    final boolean visible) {
278:                this .text.add("\n");
279:                final AnnotationVisitor tav = super .visitAnnotation(desc,
280:                        visible);
281:                if (this .cv != null) {
282:                    ((TraceAnnotationVisitor) tav).av = this .cv
283:                            .visitAnnotation(desc, visible);
284:                }
285:                return tav;
286:            }
287:
288:            public void visitAttribute(final Attribute attr) {
289:                this .text.add("\n");
290:                super .visitAttribute(attr);
291:
292:                if (this .cv != null) {
293:                    this .cv.visitAttribute(attr);
294:                }
295:            }
296:
297:            public void visitInnerClass(final String name,
298:                    final String outerName, final String innerName,
299:                    final int access) {
300:                this .buf.setLength(0);
301:                this .buf.append(this .tab).append("// access flags ").append(
302:                        access & ~Opcodes.ACC_SUPER).append('\n');
303:                this .buf.append(this .tab);
304:                appendAccess(access);
305:                this .buf.append("INNERCLASS ");
306:                if ((access & Opcodes.ACC_ENUM) != 0) {
307:                    this .buf.append("enum ");
308:                }
309:                appendDescriptor(TraceAbstractVisitor.INTERNAL_NAME, name);
310:                this .buf.append(' ');
311:                appendDescriptor(TraceAbstractVisitor.INTERNAL_NAME, outerName);
312:                this .buf.append(' ');
313:                appendDescriptor(TraceAbstractVisitor.INTERNAL_NAME, innerName);
314:                this .buf.append('\n');
315:                this .text.add(this .buf.toString());
316:
317:                if (this .cv != null) {
318:                    this .cv.visitInnerClass(name, outerName, innerName, access);
319:                }
320:            }
321:
322:            public FieldVisitor visitField(final int access, final String name,
323:                    final String desc, final String signature,
324:                    final Object value) {
325:                this .buf.setLength(0);
326:                this .buf.append('\n');
327:                if ((access & Opcodes.ACC_DEPRECATED) != 0) {
328:                    this .buf.append(this .tab).append("// DEPRECATED\n");
329:                }
330:                this .buf.append(this .tab).append("// access flags ").append(
331:                        access).append('\n');
332:                if (signature != null) {
333:                    this .buf.append(this .tab);
334:                    appendDescriptor(TraceAbstractVisitor.FIELD_SIGNATURE,
335:                            signature);
336:
337:                    final TraceSignatureVisitor sv = new TraceSignatureVisitor(
338:                            0);
339:                    final SignatureReader r = new SignatureReader(signature);
340:                    r.acceptType(sv);
341:                    this .buf.append(this .tab).append("// declaration: ")
342:                            .append(sv.getDeclaration()).append('\n');
343:                }
344:
345:                this .buf.append(this .tab);
346:                appendAccess(access);
347:                if ((access & Opcodes.ACC_ENUM) != 0) {
348:                    this .buf.append("enum ");
349:                }
350:
351:                appendDescriptor(TraceAbstractVisitor.FIELD_DESCRIPTOR, desc);
352:                this .buf.append(' ').append(name);
353:                if (value != null) {
354:                    this .buf.append(" = ");
355:                    if (value instanceof  String) {
356:                        this .buf.append("\"").append(value).append("\"");
357:                    } else {
358:                        this .buf.append(value);
359:                    }
360:                }
361:
362:                this .buf.append('\n');
363:                this .text.add(this .buf.toString());
364:
365:                final TraceFieldVisitor tav = createTraceFieldVisitor();
366:                this .text.add(tav.getText());
367:
368:                if (this .cv != null) {
369:                    tav.fv = this .cv.visitField(access, name, desc, signature,
370:                            value);
371:                }
372:
373:                return tav;
374:            }
375:
376:            public MethodVisitor visitMethod(final int access,
377:                    final String name, final String desc,
378:                    final String signature, final String[] exceptions) {
379:                this .buf.setLength(0);
380:                this .buf.append('\n');
381:                if ((access & Opcodes.ACC_DEPRECATED) != 0) {
382:                    this .buf.append(this .tab).append("// DEPRECATED\n");
383:                }
384:                this .buf.append(this .tab).append("// access flags ").append(
385:                        access).append('\n');
386:                this .buf.append(this .tab);
387:                appendDescriptor(TraceAbstractVisitor.METHOD_SIGNATURE,
388:                        signature);
389:
390:                if (signature != null) {
391:                    final TraceSignatureVisitor v = new TraceSignatureVisitor(0);
392:                    final SignatureReader r = new SignatureReader(signature);
393:                    r.accept(v);
394:                    final String genericDecl = v.getDeclaration();
395:                    final String genericReturn = v.getReturnType();
396:                    final String genericExceptions = v.getExceptions();
397:
398:                    this .buf.append(this .tab).append("// declaration: ")
399:                            .append(genericReturn).append(' ').append(name)
400:                            .append(genericDecl);
401:                    if (genericExceptions != null) {
402:                        this .buf.append(" throws ").append(genericExceptions);
403:                    }
404:                    this .buf.append('\n');
405:                }
406:
407:                appendAccess(access);
408:                if ((access & Opcodes.ACC_NATIVE) != 0) {
409:                    this .buf.append("native ");
410:                }
411:                if ((access & Opcodes.ACC_VARARGS) != 0) {
412:                    this .buf.append("varargs ");
413:                }
414:                if ((access & Opcodes.ACC_BRIDGE) != 0) {
415:                    this .buf.append("bridge ");
416:                }
417:
418:                this .buf.append(name);
419:                appendDescriptor(TraceAbstractVisitor.METHOD_DESCRIPTOR, desc);
420:                if (exceptions != null && exceptions.length > 0) {
421:                    this .buf.append(" throws ");
422:                    for (int i = 0; i < exceptions.length; ++i) {
423:                        appendDescriptor(TraceAbstractVisitor.INTERNAL_NAME,
424:                                exceptions[i]);
425:                        this .buf.append(' ');
426:                    }
427:                }
428:
429:                this .buf.append('\n');
430:                this .text.add(this .buf.toString());
431:
432:                final TraceMethodVisitor tcv = createTraceMethodVisitor();
433:                this .text.add(tcv.getText());
434:
435:                if (this .cv != null) {
436:                    tcv.mv = this .cv.visitMethod(access, name, desc, signature,
437:                            exceptions);
438:                }
439:
440:                return tcv;
441:            }
442:
443:            public void visitEnd() {
444:                this .text.add("}\n");
445:
446:                printList(this .pw, this .text);
447:                this .pw.flush();
448:
449:                if (this .cv != null) {
450:                    this .cv.visitEnd();
451:                }
452:            }
453:
454:            // ------------------------------------------------------------------------
455:            // Utility methods
456:            // ------------------------------------------------------------------------
457:
458:            protected TraceFieldVisitor createTraceFieldVisitor() {
459:                return new TraceFieldVisitor();
460:            }
461:
462:            protected TraceMethodVisitor createTraceMethodVisitor() {
463:                return new TraceMethodVisitor();
464:            }
465:
466:            /**
467:             * Appends a string representation of the given access modifiers to {@link
468:             * #buf buf}.
469:             * 
470:             * @param access some access modifiers.
471:             */
472:            private void appendAccess(final int access) {
473:                if ((access & Opcodes.ACC_PUBLIC) != 0) {
474:                    this .buf.append("public ");
475:                }
476:                if ((access & Opcodes.ACC_PRIVATE) != 0) {
477:                    this .buf.append("private ");
478:                }
479:                if ((access & Opcodes.ACC_PROTECTED) != 0) {
480:                    this .buf.append("protected ");
481:                }
482:                if ((access & Opcodes.ACC_FINAL) != 0) {
483:                    this .buf.append("final ");
484:                }
485:                if ((access & Opcodes.ACC_STATIC) != 0) {
486:                    this .buf.append("static ");
487:                }
488:                if ((access & Opcodes.ACC_SYNCHRONIZED) != 0) {
489:                    this .buf.append("synchronized ");
490:                }
491:                if ((access & Opcodes.ACC_VOLATILE) != 0) {
492:                    this .buf.append("volatile ");
493:                }
494:                if ((access & Opcodes.ACC_TRANSIENT) != 0) {
495:                    this .buf.append("transient ");
496:                }
497:                // if ((access & Constants.ACC_NATIVE) != 0) {
498:                // buf.append("native ");
499:                // }
500:                if ((access & Opcodes.ACC_ABSTRACT) != 0) {
501:                    this .buf.append("abstract ");
502:                }
503:                if ((access & Opcodes.ACC_STRICT) != 0) {
504:                    this .buf.append("strictfp ");
505:                }
506:                if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
507:                    this .buf.append("synthetic ");
508:                }
509:            }
510:        }
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