Source Code Cross Referenced for ASMifierClassVisitor.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.ClassReader;
036:        import org.drools.asm.ClassVisitor;
037:        import org.drools.asm.FieldVisitor;
038:        import org.drools.asm.MethodVisitor;
039:        import org.drools.asm.Opcodes;
040:        import org.drools.asm.Type;
041:
042:        /**
043:         * A {@link ClassVisitor} that prints the ASM code that generates the classes it
044:         * visits. This class visitor can be used to quickly write ASM code to generate
045:         * some given bytecode: <ul> <li>write the Java source code equivalent to the
046:         * bytecode you want to generate;</li> <li>compile it with <tt>javac</tt>;</li>
047:         * <li>make a {@link ASMifierClassVisitor} visit this compiled class (see the
048:         * {@link #main main} method);</li> <li>edit the generated source code, if
049:         * necessary.</li> </ul> The source code printed when visiting the
050:         * <tt>Hello</tt> class is the following: <p> <blockquote>
051:         * 
052:         * <pre>
053:         * import org.objectweb.asm.*;
054:         * 
055:         * public class HelloDump implements Opcodes {
056:         * 
057:         *     public static byte[] dump() throws Exception {
058:         * 
059:         *         ClassWriter cw = new ClassWriter(false);
060:         *         FieldVisitor fv;
061:         *         MethodVisitor mv;
062:         *         AnnotationVisitor av0;
063:         * 
064:         *         cw.visit(49,
065:         *                 ACC_PUBLIC + ACC_SUPER,
066:         *                 &quot;Hello&quot;,
067:         *                 null,
068:         *                 &quot;java/lang/Object&quot;,
069:         *                 null);
070:         * 
071:         *         cw.visitSource(&quot;Hello.java&quot;, null);
072:         * 
073:         *         {
074:         *             mv = cw.visitMethod(ACC_PUBLIC, &quot;&lt;init&gt;&quot;, &quot;()V&quot;, null, null);
075:         *             mv.visitVarInsn(ALOAD, 0);
076:         *             mv.visitMethodInsn(INVOKESPECIAL,
077:         *                     &quot;java/lang/Object&quot;,
078:         *                     &quot;&lt;init&gt;&quot;,
079:         *                     &quot;()V&quot;);
080:         *             mv.visitInsn(RETURN);
081:         *             mv.visitMaxs(1, 1);
082:         *             mv.visitEnd();
083:         *         }
084:         *         {
085:         *             mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC,
086:         *                     &quot;main&quot;,
087:         *                     &quot;([Ljava/lang/String;)V&quot;,
088:         *                     null,
089:         *                     null);
090:         *             mv.visitFieldInsn(GETSTATIC,
091:         *                     &quot;java/lang/System&quot;,
092:         *                     &quot;out&quot;,
093:         *                     &quot;Ljava/io/PrintStream;&quot;);
094:         *             mv.visitLdcInsn(&quot;hello&quot;);
095:         *             mv.visitMethodInsn(INVOKEVIRTUAL,
096:         *                     &quot;java/io/PrintStream&quot;,
097:         *                     &quot;println&quot;,
098:         *                     &quot;(Ljava/lang/String;)V&quot;);
099:         *             mv.visitInsn(RETURN);
100:         *             mv.visitMaxs(2, 1);
101:         *             mv.visitEnd();
102:         *         }
103:         *         cw.visitEnd();
104:         * 
105:         *         return cw.toByteArray();
106:         *     }
107:         * }
108:         * 
109:         * </pre>
110:         * 
111:         * </blockquote> where <tt>Hello</tt> is defined by: <p> <blockquote>
112:         * 
113:         * <pre>
114:         * public class Hello {
115:         * 
116:         *     public static void main(String[] args) {
117:         *         System.out.println(&quot;hello&quot;);
118:         *     }
119:         * }
120:         * </pre>
121:         * 
122:         * </blockquote>
123:         * 
124:         * @author Eric Bruneton
125:         * @author Eugene Kuleshov
126:         */
127:        public class ASMifierClassVisitor extends ASMifierAbstractVisitor
128:                implements  ClassVisitor {
129:
130:            /**
131:             * Pseudo access flag used to distinguish class access flags.
132:             */
133:            private final static int ACCESS_CLASS = 262144;
134:
135:            /**
136:             * Pseudo access flag used to distinguish field access flags.
137:             */
138:            private final static int ACCESS_FIELD = 524288;
139:
140:            /**
141:             * Pseudo access flag used to distinguish inner class flags.
142:             */
143:            private static final int ACCESS_INNER = 1048576;
144:
145:            /**
146:             * The print writer to be used to print the class.
147:             */
148:            protected final PrintWriter pw;
149:
150:            /**
151:             * Prints the ASM source code to generate the given class to the standard
152:             * output. <p> Usage: ASMifierClassVisitor [-debug] &lt;fully qualified
153:             * class name or class file name&gt;
154:             * 
155:             * @param args the command line arguments.
156:             * 
157:             * @throws Exception if the class cannot be found, or if an IO exception
158:             *         occurs.
159:             */
160:            public static void main(final String[] args) throws Exception {
161:                int i = 0;
162:                boolean skipDebug = true;
163:
164:                boolean ok = true;
165:                if (args.length < 1 || args.length > 2) {
166:                    ok = false;
167:                }
168:                if (ok && args[0].equals("-debug")) {
169:                    i = 1;
170:                    skipDebug = false;
171:                    if (args.length != 2) {
172:                        ok = false;
173:                    }
174:                }
175:                if (!ok) {
176:                    System.err
177:                            .println("Prints the ASM code to generate the given class.");
178:                    System.err
179:                            .println("Usage: ASMifierClassVisitor [-debug] "
180:                                    + "<fully qualified class name or class file name>");
181:                    return;
182:                }
183:                ClassReader cr;
184:                if (args[i].endsWith(".class") || args[i].indexOf('\\') > -1
185:                        || args[i].indexOf('/') > -1) {
186:                    cr = new ClassReader(new FileInputStream(args[i]));
187:                } else {
188:                    cr = new ClassReader(args[i]);
189:                }
190:                cr.accept(
191:                        new ASMifierClassVisitor(new PrintWriter(System.out)),
192:                        getDefaultAttributes(), skipDebug);
193:            }
194:
195:            /**
196:             * Constructs a new {@link ASMifierClassVisitor} object.
197:             * 
198:             * @param pw the print writer to be used to print the class.
199:             */
200:            public ASMifierClassVisitor(final PrintWriter pw) {
201:                super ("cw");
202:                this .pw = pw;
203:            }
204:
205:            // ------------------------------------------------------------------------
206:            // Implementation of the ClassVisitor interface
207:            // ------------------------------------------------------------------------
208:
209:            public void visit(final int version, final int access,
210:                    final String name, final String signature,
211:                    final String super Name, final String[] interfaces) {
212:                String simpleName;
213:                final int n = name.lastIndexOf('/');
214:                if (n != -1) {
215:                    this .text.add("package asm."
216:                            + name.substring(0, n).replace('/', '.') + ";\n");
217:                    simpleName = name.substring(n + 1);
218:                } else {
219:                    simpleName = name;
220:                }
221:                this .text.add("import java.util.*;\n");
222:                this .text.add("import org.objectweb.asm.*;\n");
223:                this .text.add("import org.objectweb.asm.attrs.*;\n");
224:                this .text.add("public class " + simpleName
225:                        + "Dump implements Opcodes {\n\n");
226:                this .text
227:                        .add("public static byte[] dump () throws Exception {\n\n");
228:                this .text.add("ClassWriter cw = new ClassWriter(false);\n");
229:                this .text.add("FieldVisitor fv;\n");
230:                this .text.add("MethodVisitor mv;\n");
231:                this .text.add("AnnotationVisitor av0;\n\n");
232:
233:                this .buf.setLength(0);
234:                this .buf.append("cw.visit(");
235:                switch (version) {
236:                case Opcodes.V1_1:
237:                    this .buf.append("V1_1");
238:                    break;
239:                case Opcodes.V1_2:
240:                    this .buf.append("V1_2");
241:                    break;
242:                case Opcodes.V1_3:
243:                    this .buf.append("V1_3");
244:                    break;
245:                case Opcodes.V1_4:
246:                    this .buf.append("V1_4");
247:                    break;
248:                case Opcodes.V1_5:
249:                    this .buf.append("V1_5");
250:                    break;
251:                case Opcodes.V1_6:
252:                    this .buf.append("V1_6");
253:                    break;
254:                default:
255:                    this .buf.append(version);
256:                    break;
257:                }
258:                this .buf.append(", ");
259:                appendAccess(access | ASMifierClassVisitor.ACCESS_CLASS);
260:                this .buf.append(", ");
261:                appendConstant(name);
262:                this .buf.append(", ");
263:                appendConstant(signature);
264:                this .buf.append(", ");
265:                appendConstant(super Name);
266:                this .buf.append(", ");
267:                if (interfaces != null && interfaces.length > 0) {
268:                    this .buf.append("new String[] {");
269:                    for (int i = 0; i < interfaces.length; ++i) {
270:                        this .buf.append(i == 0 ? " " : ", ");
271:                        appendConstant(interfaces[i]);
272:                    }
273:                    this .buf.append(" }");
274:                } else {
275:                    this .buf.append("null");
276:                }
277:                this .buf.append(");\n\n");
278:                this .text.add(this .buf.toString());
279:            }
280:
281:            public void visitSource(final String file, final String debug) {
282:                this .buf.setLength(0);
283:                this .buf.append("cw.visitSource(");
284:                appendConstant(file);
285:                this .buf.append(", ");
286:                appendConstant(debug);
287:                this .buf.append(");\n\n");
288:                this .text.add(this .buf.toString());
289:            }
290:
291:            public void visitOuterClass(final String owner, final String name,
292:                    final String desc) {
293:                this .buf.setLength(0);
294:                this .buf.append("cw.visitOuterClass(");
295:                appendConstant(owner);
296:                this .buf.append(", ");
297:                appendConstant(name);
298:                this .buf.append(", ");
299:                appendConstant(desc);
300:                this .buf.append(");\n\n");
301:                this .text.add(this .buf.toString());
302:            }
303:
304:            public void visitInnerClass(final String name,
305:                    final String outerName, final String innerName,
306:                    final int access) {
307:                this .buf.setLength(0);
308:                this .buf.append("cw.visitInnerClass(");
309:                appendConstant(name);
310:                this .buf.append(", ");
311:                appendConstant(outerName);
312:                this .buf.append(", ");
313:                appendConstant(innerName);
314:                this .buf.append(", ");
315:                appendAccess(access | ASMifierClassVisitor.ACCESS_INNER);
316:                this .buf.append(");\n\n");
317:                this .text.add(this .buf.toString());
318:            }
319:
320:            public FieldVisitor visitField(final int access, final String name,
321:                    final String desc, final String signature,
322:                    final Object value) {
323:                this .buf.setLength(0);
324:                this .buf.append("{\n");
325:                this .buf.append("fv = cw.visitField(");
326:                appendAccess(access | ASMifierClassVisitor.ACCESS_FIELD);
327:                this .buf.append(", ");
328:                appendConstant(name);
329:                this .buf.append(", ");
330:                appendConstant(desc);
331:                this .buf.append(", ");
332:                appendConstant(signature);
333:                this .buf.append(", ");
334:                appendConstant(value);
335:                this .buf.append(");\n");
336:                this .text.add(this .buf.toString());
337:                final ASMifierFieldVisitor aav = new ASMifierFieldVisitor();
338:                this .text.add(aav.getText());
339:                this .text.add("}\n");
340:                return aav;
341:            }
342:
343:            public MethodVisitor visitMethod(final int access,
344:                    final String name, final String desc,
345:                    final String signature, final String[] exceptions) {
346:                this .buf.setLength(0);
347:                this .buf.append("{\n");
348:                this .buf.append("mv = cw.visitMethod(");
349:                appendAccess(access);
350:                this .buf.append(", ");
351:                appendConstant(name);
352:                this .buf.append(", ");
353:                appendConstant(desc);
354:                this .buf.append(", ");
355:                appendConstant(signature);
356:                this .buf.append(", ");
357:                if (exceptions != null && exceptions.length > 0) {
358:                    this .buf.append("new String[] {");
359:                    for (int i = 0; i < exceptions.length; ++i) {
360:                        this .buf.append(i == 0 ? " " : ", ");
361:                        appendConstant(exceptions[i]);
362:                    }
363:                    this .buf.append(" }");
364:                } else {
365:                    this .buf.append("null");
366:                }
367:                this .buf.append(");\n");
368:                this .text.add(this .buf.toString());
369:                final ASMifierMethodVisitor acv = new ASMifierMethodVisitor();
370:                this .text.add(acv.getText());
371:                this .text.add("}\n");
372:                return acv;
373:            }
374:
375:            public AnnotationVisitor visitAnnotation(final String desc,
376:                    final boolean visible) {
377:                this .buf.setLength(0);
378:                this .buf.append("{\n");
379:                this .buf.append("av0 = cw.visitAnnotation(");
380:                appendConstant(desc);
381:                this .buf.append(", ");
382:                this .buf.append(visible);
383:                this .buf.append(");\n");
384:                this .text.add(this .buf.toString());
385:                final ASMifierAnnotationVisitor av = new ASMifierAnnotationVisitor(
386:                        0);
387:                this .text.add(av.getText());
388:                this .text.add("}\n");
389:                return av;
390:            }
391:
392:            public void visitEnd() {
393:                this .text.add("cw.visitEnd();\n\n");
394:                this .text.add("return cw.toByteArray();\n");
395:                this .text.add("}\n");
396:                this .text.add("}\n");
397:                printList(this .pw, this .text);
398:                this .pw.flush();
399:            }
400:
401:            // ------------------------------------------------------------------------
402:            // Utility methods
403:            // ------------------------------------------------------------------------
404:
405:            /**
406:             * Appends a string representation of the given access modifiers to {@link
407:             * #buf buf}.
408:             * 
409:             * @param access some access modifiers.
410:             */
411:            void appendAccess(final int access) {
412:                boolean first = true;
413:                if ((access & Opcodes.ACC_PUBLIC) != 0) {
414:                    this .buf.append("ACC_PUBLIC");
415:                    first = false;
416:                }
417:                if ((access & Opcodes.ACC_PRIVATE) != 0) {
418:                    if (!first) {
419:                        this .buf.append(" + ");
420:                    }
421:                    this .buf.append("ACC_PRIVATE");
422:                    first = false;
423:                }
424:                if ((access & Opcodes.ACC_PROTECTED) != 0) {
425:                    if (!first) {
426:                        this .buf.append(" + ");
427:                    }
428:                    this .buf.append("ACC_PROTECTED");
429:                    first = false;
430:                }
431:                if ((access & Opcodes.ACC_FINAL) != 0) {
432:                    if (!first) {
433:                        this .buf.append(" + ");
434:                    }
435:                    this .buf.append("ACC_FINAL");
436:                    first = false;
437:                }
438:                if ((access & Opcodes.ACC_STATIC) != 0) {
439:                    if (!first) {
440:                        this .buf.append(" + ");
441:                    }
442:                    this .buf.append("ACC_STATIC");
443:                    first = false;
444:                }
445:                if ((access & Opcodes.ACC_SYNCHRONIZED) != 0) {
446:                    if (!first) {
447:                        this .buf.append(" + ");
448:                    }
449:                    if ((access & ASMifierClassVisitor.ACCESS_CLASS) != 0) {
450:                        this .buf.append("ACC_SUPER");
451:                    } else {
452:                        this .buf.append("ACC_SYNCHRONIZED");
453:                    }
454:                    first = false;
455:                }
456:                if ((access & Opcodes.ACC_VOLATILE) != 0
457:                        && (access & ASMifierClassVisitor.ACCESS_FIELD) != 0) {
458:                    if (!first) {
459:                        this .buf.append(" + ");
460:                    }
461:                    this .buf.append("ACC_VOLATILE");
462:                    first = false;
463:                }
464:                if ((access & Opcodes.ACC_BRIDGE) != 0
465:                        && (access & ASMifierClassVisitor.ACCESS_CLASS) == 0
466:                        && (access & ASMifierClassVisitor.ACCESS_FIELD) == 0) {
467:                    if (!first) {
468:                        this .buf.append(" + ");
469:                    }
470:                    this .buf.append("ACC_BRIDGE");
471:                    first = false;
472:                }
473:                if ((access & Opcodes.ACC_VARARGS) != 0
474:                        && (access & ASMifierClassVisitor.ACCESS_CLASS) == 0
475:                        && (access & ASMifierClassVisitor.ACCESS_FIELD) == 0) {
476:                    if (!first) {
477:                        this .buf.append(" + ");
478:                    }
479:                    this .buf.append("ACC_VARARGS");
480:                    first = false;
481:                }
482:                if ((access & Opcodes.ACC_TRANSIENT) != 0
483:                        && (access & ASMifierClassVisitor.ACCESS_FIELD) != 0) {
484:                    if (!first) {
485:                        this .buf.append(" + ");
486:                    }
487:                    this .buf.append("ACC_TRANSIENT");
488:                    first = false;
489:                }
490:                if ((access & Opcodes.ACC_NATIVE) != 0
491:                        && (access & ASMifierClassVisitor.ACCESS_CLASS) == 0
492:                        && (access & ASMifierClassVisitor.ACCESS_FIELD) == 0) {
493:                    if (!first) {
494:                        this .buf.append(" + ");
495:                    }
496:                    this .buf.append("ACC_NATIVE");
497:                    first = false;
498:                }
499:                if ((access & Opcodes.ACC_ENUM) != 0
500:                        && ((access & ASMifierClassVisitor.ACCESS_CLASS) != 0
501:                                || (access & ASMifierClassVisitor.ACCESS_FIELD) != 0 || (access & ASMifierClassVisitor.ACCESS_INNER) != 0)) {
502:                    if (!first) {
503:                        this .buf.append(" + ");
504:                    }
505:                    this .buf.append("ACC_ENUM");
506:                    first = false;
507:                }
508:                if ((access & Opcodes.ACC_ANNOTATION) != 0
509:                        && ((access & ASMifierClassVisitor.ACCESS_CLASS) != 0)) {
510:                    if (!first) {
511:                        this .buf.append(" + ");
512:                    }
513:                    this .buf.append("ACC_ANNOTATION");
514:                    first = false;
515:                }
516:                if ((access & Opcodes.ACC_ABSTRACT) != 0) {
517:                    if (!first) {
518:                        this .buf.append(" + ");
519:                    }
520:                    this .buf.append("ACC_ABSTRACT");
521:                    first = false;
522:                }
523:                if ((access & Opcodes.ACC_INTERFACE) != 0) {
524:                    if (!first) {
525:                        this .buf.append(" + ");
526:                    }
527:                    this .buf.append("ACC_INTERFACE");
528:                    first = false;
529:                }
530:                if ((access & Opcodes.ACC_STRICT) != 0) {
531:                    if (!first) {
532:                        this .buf.append(" + ");
533:                    }
534:                    this .buf.append("ACC_STRICT");
535:                    first = false;
536:                }
537:                if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
538:                    if (!first) {
539:                        this .buf.append(" + ");
540:                    }
541:                    this .buf.append("ACC_SYNTHETIC");
542:                    first = false;
543:                }
544:                if ((access & Opcodes.ACC_DEPRECATED) != 0) {
545:                    if (!first) {
546:                        this .buf.append(" + ");
547:                    }
548:                    this .buf.append("ACC_DEPRECATED");
549:                    first = false;
550:                }
551:                if (first) {
552:                    this .buf.append("0");
553:                }
554:            }
555:
556:            /**
557:             * Appends a string representation of the given constant to the given
558:             * buffer.
559:             * 
560:             * @param buf a string buffer.
561:             * @param cst an {@link java.lang.Integer Integer}, {@link java.lang.Float
562:             *        Float}, {@link java.lang.Long Long},
563:             *        {@link java.lang.Double Double} or {@link String String} object.
564:             *        May be <tt>null</tt>.
565:             */
566:            static void appendConstant(final StringBuffer buf, final Object cst) {
567:                if (cst == null) {
568:                    buf.append("null");
569:                } else if (cst instanceof  String) {
570:                    AbstractVisitor.appendString(buf, (String) cst);
571:                } else if (cst instanceof  Type) {
572:                    buf.append("Type.getType(\"").append(
573:                            ((Type) cst).getDescriptor()).append("\")");
574:                } else if (cst instanceof  Integer) {
575:                    buf.append("new Integer(").append(cst).append(")");
576:                } else if (cst instanceof  Float) {
577:                    buf.append("new Float(\"").append(cst).append("\")");
578:                } else if (cst instanceof  Long) {
579:                    buf.append("new Long(").append(cst).append("L)");
580:                } else if (cst instanceof  Double) {
581:                    buf.append("new Double(\"").append(cst).append("\")");
582:                }
583:            }
584:        }
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