Source Code Cross Referenced for ASMifierClassVisitor.java in  » Web-Framework » rife-1.6.1 » com » uwyn » rife » asm » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » rife 1.6.1 » com.uwyn.rife.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 com.uwyn.rife.asm.util;
030:
031:        import java.io.FileInputStream;
032:        import java.io.PrintWriter;
033:
034:        import com.uwyn.rife.asm.AnnotationVisitor;
035:        import com.uwyn.rife.asm.ClassReader;
036:        import com.uwyn.rife.asm.ClassVisitor;
037:        import com.uwyn.rife.asm.FieldVisitor;
038:        import com.uwyn.rife.asm.MethodVisitor;
039:        import com.uwyn.rife.asm.Opcodes;
040:        import com.uwyn.rife.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 com.uwyn.rife.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:                int n = name.lastIndexOf('/');
214:                if (n != -1) {
215:                    text.add("package asm."
216:                            + name.substring(0, n).replace('/', '.') + ";\n");
217:                    simpleName = name.substring(n + 1);
218:                } else {
219:                    simpleName = name;
220:                }
221:                text.add("import java.util.*;\n");
222:                text.add("import com.uwyn.rife.asm.*;\n");
223:                text.add("import com.uwyn.rife.asm.attrs.*;\n");
224:                text.add("public class " + simpleName
225:                        + "Dump implements Opcodes {\n\n");
226:                text.add("public static byte[] dump () throws Exception {\n\n");
227:                text.add("ClassWriter cw = new ClassWriter(false);\n");
228:                text.add("FieldVisitor fv;\n");
229:                text.add("MethodVisitor mv;\n");
230:                text.add("AnnotationVisitor av0;\n\n");
231:
232:                buf.setLength(0);
233:                buf.append("cw.visit(");
234:                switch (version) {
235:                case Opcodes.V1_1:
236:                    buf.append("V1_1");
237:                    break;
238:                case Opcodes.V1_2:
239:                    buf.append("V1_2");
240:                    break;
241:                case Opcodes.V1_3:
242:                    buf.append("V1_3");
243:                    break;
244:                case Opcodes.V1_4:
245:                    buf.append("V1_4");
246:                    break;
247:                case Opcodes.V1_5:
248:                    buf.append("V1_5");
249:                    break;
250:                case Opcodes.V1_6:
251:                    buf.append("V1_6");
252:                    break;
253:                default:
254:                    buf.append(version);
255:                    break;
256:                }
257:                buf.append(", ");
258:                appendAccess(access | ACCESS_CLASS);
259:                buf.append(", ");
260:                appendConstant(name);
261:                buf.append(", ");
262:                appendConstant(signature);
263:                buf.append(", ");
264:                appendConstant(super Name);
265:                buf.append(", ");
266:                if (interfaces != null && interfaces.length > 0) {
267:                    buf.append("new String[] {");
268:                    for (int i = 0; i < interfaces.length; ++i) {
269:                        buf.append(i == 0 ? " " : ", ");
270:                        appendConstant(interfaces[i]);
271:                    }
272:                    buf.append(" }");
273:                } else {
274:                    buf.append("null");
275:                }
276:                buf.append(");\n\n");
277:                text.add(buf.toString());
278:            }
279:
280:            public void visitSource(final String file, final String debug) {
281:                buf.setLength(0);
282:                buf.append("cw.visitSource(");
283:                appendConstant(file);
284:                buf.append(", ");
285:                appendConstant(debug);
286:                buf.append(");\n\n");
287:                text.add(buf.toString());
288:            }
289:
290:            public void visitOuterClass(final String owner, final String name,
291:                    final String desc) {
292:                buf.setLength(0);
293:                buf.append("cw.visitOuterClass(");
294:                appendConstant(owner);
295:                buf.append(", ");
296:                appendConstant(name);
297:                buf.append(", ");
298:                appendConstant(desc);
299:                buf.append(");\n\n");
300:                text.add(buf.toString());
301:            }
302:
303:            public void visitInnerClass(final String name,
304:                    final String outerName, final String innerName,
305:                    final int access) {
306:                buf.setLength(0);
307:                buf.append("cw.visitInnerClass(");
308:                appendConstant(name);
309:                buf.append(", ");
310:                appendConstant(outerName);
311:                buf.append(", ");
312:                appendConstant(innerName);
313:                buf.append(", ");
314:                appendAccess(access | ACCESS_INNER);
315:                buf.append(");\n\n");
316:                text.add(buf.toString());
317:            }
318:
319:            public FieldVisitor visitField(final int access, final String name,
320:                    final String desc, final String signature,
321:                    final Object value) {
322:                buf.setLength(0);
323:                buf.append("{\n");
324:                buf.append("fv = cw.visitField(");
325:                appendAccess(access | ACCESS_FIELD);
326:                buf.append(", ");
327:                appendConstant(name);
328:                buf.append(", ");
329:                appendConstant(desc);
330:                buf.append(", ");
331:                appendConstant(signature);
332:                buf.append(", ");
333:                appendConstant(value);
334:                buf.append(");\n");
335:                text.add(buf.toString());
336:                ASMifierFieldVisitor aav = new ASMifierFieldVisitor();
337:                text.add(aav.getText());
338:                text.add("}\n");
339:                return aav;
340:            }
341:
342:            public MethodVisitor visitMethod(final int access,
343:                    final String name, final String desc,
344:                    final String signature, final String[] exceptions) {
345:                buf.setLength(0);
346:                buf.append("{\n");
347:                buf.append("mv = cw.visitMethod(");
348:                appendAccess(access);
349:                buf.append(", ");
350:                appendConstant(name);
351:                buf.append(", ");
352:                appendConstant(desc);
353:                buf.append(", ");
354:                appendConstant(signature);
355:                buf.append(", ");
356:                if (exceptions != null && exceptions.length > 0) {
357:                    buf.append("new String[] {");
358:                    for (int i = 0; i < exceptions.length; ++i) {
359:                        buf.append(i == 0 ? " " : ", ");
360:                        appendConstant(exceptions[i]);
361:                    }
362:                    buf.append(" }");
363:                } else {
364:                    buf.append("null");
365:                }
366:                buf.append(");\n");
367:                text.add(buf.toString());
368:                ASMifierMethodVisitor acv = new ASMifierMethodVisitor();
369:                text.add(acv.getText());
370:                text.add("}\n");
371:                return acv;
372:            }
373:
374:            public AnnotationVisitor visitAnnotation(final String desc,
375:                    final boolean visible) {
376:                buf.setLength(0);
377:                buf.append("{\n");
378:                buf.append("av0 = cw.visitAnnotation(");
379:                appendConstant(desc);
380:                buf.append(", ");
381:                buf.append(visible);
382:                buf.append(");\n");
383:                text.add(buf.toString());
384:                ASMifierAnnotationVisitor av = new ASMifierAnnotationVisitor(0);
385:                text.add(av.getText());
386:                text.add("}\n");
387:                return av;
388:            }
389:
390:            public void visitEnd() {
391:                text.add("cw.visitEnd();\n\n");
392:                text.add("return cw.toByteArray();\n");
393:                text.add("}\n");
394:                text.add("}\n");
395:                printList(pw, text);
396:                pw.flush();
397:            }
398:
399:            // ------------------------------------------------------------------------
400:            // Utility methods
401:            // ------------------------------------------------------------------------
402:
403:            /**
404:             * Appends a string representation of the given access modifiers to {@link
405:             * #buf buf}.
406:             * 
407:             * @param access some access modifiers.
408:             */
409:            void appendAccess(final int access) {
410:                boolean first = true;
411:                if ((access & Opcodes.ACC_PUBLIC) != 0) {
412:                    buf.append("ACC_PUBLIC");
413:                    first = false;
414:                }
415:                if ((access & Opcodes.ACC_PRIVATE) != 0) {
416:                    if (!first) {
417:                        buf.append(" + ");
418:                    }
419:                    buf.append("ACC_PRIVATE");
420:                    first = false;
421:                }
422:                if ((access & Opcodes.ACC_PROTECTED) != 0) {
423:                    if (!first) {
424:                        buf.append(" + ");
425:                    }
426:                    buf.append("ACC_PROTECTED");
427:                    first = false;
428:                }
429:                if ((access & Opcodes.ACC_FINAL) != 0) {
430:                    if (!first) {
431:                        buf.append(" + ");
432:                    }
433:                    buf.append("ACC_FINAL");
434:                    first = false;
435:                }
436:                if ((access & Opcodes.ACC_STATIC) != 0) {
437:                    if (!first) {
438:                        buf.append(" + ");
439:                    }
440:                    buf.append("ACC_STATIC");
441:                    first = false;
442:                }
443:                if ((access & Opcodes.ACC_SYNCHRONIZED) != 0) {
444:                    if (!first) {
445:                        buf.append(" + ");
446:                    }
447:                    if ((access & ACCESS_CLASS) != 0) {
448:                        buf.append("ACC_SUPER");
449:                    } else {
450:                        buf.append("ACC_SYNCHRONIZED");
451:                    }
452:                    first = false;
453:                }
454:                if ((access & Opcodes.ACC_VOLATILE) != 0
455:                        && (access & ACCESS_FIELD) != 0) {
456:                    if (!first) {
457:                        buf.append(" + ");
458:                    }
459:                    buf.append("ACC_VOLATILE");
460:                    first = false;
461:                }
462:                if ((access & Opcodes.ACC_BRIDGE) != 0
463:                        && (access & ACCESS_CLASS) == 0
464:                        && (access & ACCESS_FIELD) == 0) {
465:                    if (!first) {
466:                        buf.append(" + ");
467:                    }
468:                    buf.append("ACC_BRIDGE");
469:                    first = false;
470:                }
471:                if ((access & Opcodes.ACC_VARARGS) != 0
472:                        && (access & ACCESS_CLASS) == 0
473:                        && (access & ACCESS_FIELD) == 0) {
474:                    if (!first) {
475:                        buf.append(" + ");
476:                    }
477:                    buf.append("ACC_VARARGS");
478:                    first = false;
479:                }
480:                if ((access & Opcodes.ACC_TRANSIENT) != 0
481:                        && (access & ACCESS_FIELD) != 0) {
482:                    if (!first) {
483:                        buf.append(" + ");
484:                    }
485:                    buf.append("ACC_TRANSIENT");
486:                    first = false;
487:                }
488:                if ((access & Opcodes.ACC_NATIVE) != 0
489:                        && (access & ACCESS_CLASS) == 0
490:                        && (access & ACCESS_FIELD) == 0) {
491:                    if (!first) {
492:                        buf.append(" + ");
493:                    }
494:                    buf.append("ACC_NATIVE");
495:                    first = false;
496:                }
497:                if ((access & Opcodes.ACC_ENUM) != 0
498:                        && ((access & ACCESS_CLASS) != 0
499:                                || (access & ACCESS_FIELD) != 0 || (access & ACCESS_INNER) != 0)) {
500:                    if (!first) {
501:                        buf.append(" + ");
502:                    }
503:                    buf.append("ACC_ENUM");
504:                    first = false;
505:                }
506:                if ((access & Opcodes.ACC_ANNOTATION) != 0
507:                        && ((access & ACCESS_CLASS) != 0)) {
508:                    if (!first) {
509:                        buf.append(" + ");
510:                    }
511:                    buf.append("ACC_ANNOTATION");
512:                    first = false;
513:                }
514:                if ((access & Opcodes.ACC_ABSTRACT) != 0) {
515:                    if (!first) {
516:                        buf.append(" + ");
517:                    }
518:                    buf.append("ACC_ABSTRACT");
519:                    first = false;
520:                }
521:                if ((access & Opcodes.ACC_INTERFACE) != 0) {
522:                    if (!first) {
523:                        buf.append(" + ");
524:                    }
525:                    buf.append("ACC_INTERFACE");
526:                    first = false;
527:                }
528:                if ((access & Opcodes.ACC_STRICT) != 0) {
529:                    if (!first) {
530:                        buf.append(" + ");
531:                    }
532:                    buf.append("ACC_STRICT");
533:                    first = false;
534:                }
535:                if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
536:                    if (!first) {
537:                        buf.append(" + ");
538:                    }
539:                    buf.append("ACC_SYNTHETIC");
540:                    first = false;
541:                }
542:                if ((access & Opcodes.ACC_DEPRECATED) != 0) {
543:                    if (!first) {
544:                        buf.append(" + ");
545:                    }
546:                    buf.append("ACC_DEPRECATED");
547:                    first = false;
548:                }
549:                if (first) {
550:                    buf.append("0");
551:                }
552:            }
553:
554:            /**
555:             * Appends a string representation of the given constant to the given
556:             * buffer.
557:             * 
558:             * @param buf a string buffer.
559:             * @param cst an {@link java.lang.Integer Integer}, {@link java.lang.Float
560:             *        Float}, {@link java.lang.Long Long},
561:             *        {@link java.lang.Double Double} or {@link String String} object.
562:             *        May be <tt>null</tt>.
563:             */
564:            static void appendConstant(final StringBuffer buf, final Object cst) {
565:                if (cst == null) {
566:                    buf.append("null");
567:                } else if (cst instanceof  String) {
568:                    AbstractVisitor.appendString(buf, (String) cst);
569:                } else if (cst instanceof  Type) {
570:                    buf.append("Type.getType(\"").append(
571:                            ((Type) cst).getDescriptor()).append("\")");
572:                } else if (cst instanceof  Integer) {
573:                    buf.append("new Integer(").append(cst).append(")");
574:                } else if (cst instanceof  Float) {
575:                    buf.append("new Float(\"").append(cst).append("\")");
576:                } else if (cst instanceof  Long) {
577:                    buf.append("new Long(").append(cst).append("L)");
578:                } else if (cst instanceof  Double) {
579:                    buf.append("new Double(\"").append(cst).append("\")");
580:                }
581:            }
582:        }
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