Source Code Cross Referenced for TraceMethodVisitor.java in  » Net » Terracotta » com » tc » asm » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » Terracotta » com.tc.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.tc.asm.util;
030:
031:        import com.tc.asm.AnnotationVisitor;
032:        import com.tc.asm.Attribute;
033:        import com.tc.asm.Label;
034:        import com.tc.asm.MethodVisitor;
035:        import com.tc.asm.Opcodes;
036:        import com.tc.asm.Type;
037:        import com.tc.asm.signature.SignatureReader;
038:
039:        import java.util.HashMap;
040:
041:        /**
042:         * A {@link MethodVisitor} that prints a disassembled view of the methods it
043:         * visits.
044:         * 
045:         * @author Eric Bruneton
046:         */
047:        public class TraceMethodVisitor extends TraceAbstractVisitor implements 
048:                MethodVisitor {
049:
050:            /**
051:             * The {@link MethodVisitor} to which this visitor delegates calls. May be
052:             * <tt>null</tt>.
053:             */
054:            protected MethodVisitor mv;
055:
056:            /**
057:             * Tab for bytecode instructions.
058:             */
059:            protected String tab2 = "    ";
060:
061:            /**
062:             * Tab for table and lookup switch instructions.
063:             */
064:            protected String tab3 = "      ";
065:
066:            /**
067:             * Tab for labels.
068:             */
069:            protected String ltab = "   ";
070:
071:            /**
072:             * The label names. This map associate String values to Label keys.
073:             */
074:            protected final HashMap labelNames;
075:
076:            /**
077:             * Constructs a new {@link TraceMethodVisitor}.
078:             */
079:            public TraceMethodVisitor() {
080:                this (null);
081:            }
082:
083:            /**
084:             * Constructs a new {@link TraceMethodVisitor}.
085:             * 
086:             * @param mv the {@link MethodVisitor} to which this visitor delegates
087:             *        calls. May be <tt>null</tt>.
088:             */
089:            public TraceMethodVisitor(final MethodVisitor mv) {
090:                this .labelNames = new HashMap();
091:                this .mv = mv;
092:            }
093:
094:            // ------------------------------------------------------------------------
095:            // Implementation of the MethodVisitor interface
096:            // ------------------------------------------------------------------------
097:
098:            public AnnotationVisitor visitAnnotation(final String desc,
099:                    final boolean visible) {
100:                AnnotationVisitor av = super .visitAnnotation(desc, visible);
101:                if (mv != null) {
102:                    ((TraceAnnotationVisitor) av).av = mv.visitAnnotation(desc,
103:                            visible);
104:                }
105:                return av;
106:            }
107:
108:            public void visitAttribute(final Attribute attr) {
109:                buf.setLength(0);
110:                buf.append(tab).append("ATTRIBUTE ");
111:                appendDescriptor(-1, attr.type);
112:
113:                if (attr instanceof  Traceable) {
114:                    ((Traceable) attr).trace(buf, labelNames);
115:                } else {
116:                    buf.append(" : unknown\n");
117:                }
118:
119:                text.add(buf.toString());
120:                if (mv != null) {
121:                    mv.visitAttribute(attr);
122:                }
123:            }
124:
125:            public AnnotationVisitor visitAnnotationDefault() {
126:                text.add(tab2 + "default=");
127:                TraceAnnotationVisitor tav = createTraceAnnotationVisitor();
128:                text.add(tav.getText());
129:                text.add("\n");
130:                if (mv != null) {
131:                    tav.av = mv.visitAnnotationDefault();
132:                }
133:                return tav;
134:            }
135:
136:            public AnnotationVisitor visitParameterAnnotation(
137:                    final int parameter, final String desc,
138:                    final boolean visible) {
139:                buf.setLength(0);
140:                buf.append(tab2).append('@');
141:                appendDescriptor(FIELD_DESCRIPTOR, desc);
142:                buf.append('(');
143:                text.add(buf.toString());
144:                TraceAnnotationVisitor tav = createTraceAnnotationVisitor();
145:                text.add(tav.getText());
146:                text.add(visible ? ") // parameter "
147:                        : ") // invisible, parameter ");
148:                text.add(new Integer(parameter));
149:                text.add("\n");
150:                if (mv != null) {
151:                    tav.av = mv.visitParameterAnnotation(parameter, desc,
152:                            visible);
153:                }
154:                return tav;
155:            }
156:
157:            public void visitCode() {
158:                if (mv != null) {
159:                    mv.visitCode();
160:                }
161:            }
162:
163:            public void visitFrame(final int type, final int nLocal,
164:                    final Object[] local, final int nStack, final Object[] stack) {
165:                buf.setLength(0);
166:                buf.append(ltab);
167:                buf.append("FRAME ");
168:                switch (type) {
169:                case Opcodes.F_NEW:
170:                case Opcodes.F_FULL:
171:                    buf.append("FULL [");
172:                    appendFrameTypes(nLocal, local);
173:                    buf.append("] [");
174:                    appendFrameTypes(nStack, stack);
175:                    buf.append("]");
176:                    break;
177:                case Opcodes.F_APPEND:
178:                    buf.append("APPEND [");
179:                    appendFrameTypes(nLocal, local);
180:                    buf.append("]");
181:                    break;
182:                case Opcodes.F_CHOP:
183:                    buf.append("CHOP ").append(nLocal);
184:                    break;
185:                case Opcodes.F_SAME:
186:                    buf.append("SAME");
187:                    break;
188:                case Opcodes.F_SAME1:
189:                    buf.append("SAME1 ");
190:                    appendFrameTypes(1, stack);
191:                    break;
192:                }
193:                buf.append("\n");
194:                text.add(buf.toString());
195:
196:                if (mv != null) {
197:                    mv.visitFrame(type, nLocal, local, nStack, stack);
198:                }
199:            }
200:
201:            public void visitInsn(final int opcode) {
202:                buf.setLength(0);
203:                buf.append(tab2).append(OPCODES[opcode]).append('\n');
204:                text.add(buf.toString());
205:
206:                if (mv != null) {
207:                    mv.visitInsn(opcode);
208:                }
209:            }
210:
211:            public void visitIntInsn(final int opcode, final int operand) {
212:                buf.setLength(0);
213:                buf.append(tab2).append(OPCODES[opcode]).append(' ').append(
214:                        opcode == Opcodes.NEWARRAY ? TYPES[operand] : Integer
215:                                .toString(operand)).append('\n');
216:                text.add(buf.toString());
217:
218:                if (mv != null) {
219:                    mv.visitIntInsn(opcode, operand);
220:                }
221:            }
222:
223:            public void visitVarInsn(final int opcode, final int var) {
224:                buf.setLength(0);
225:                buf.append(tab2).append(OPCODES[opcode]).append(' ')
226:                        .append(var).append('\n');
227:                text.add(buf.toString());
228:
229:                if (mv != null) {
230:                    mv.visitVarInsn(opcode, var);
231:                }
232:            }
233:
234:            public void visitTypeInsn(final int opcode, final String desc) {
235:                buf.setLength(0);
236:                buf.append(tab2).append(OPCODES[opcode]).append(' ');
237:                if (desc.startsWith("[")) {
238:                    appendDescriptor(FIELD_DESCRIPTOR, desc);
239:                } else {
240:                    appendDescriptor(INTERNAL_NAME, desc);
241:                }
242:                buf.append('\n');
243:                text.add(buf.toString());
244:
245:                if (mv != null) {
246:                    mv.visitTypeInsn(opcode, desc);
247:                }
248:            }
249:
250:            public void visitFieldInsn(final int opcode, final String owner,
251:                    final String name, final String desc) {
252:                buf.setLength(0);
253:                buf.append(tab2).append(OPCODES[opcode]).append(' ');
254:                appendDescriptor(INTERNAL_NAME, owner);
255:                buf.append('.').append(name).append(" : ");
256:                appendDescriptor(FIELD_DESCRIPTOR, desc);
257:                buf.append('\n');
258:                text.add(buf.toString());
259:
260:                if (mv != null) {
261:                    mv.visitFieldInsn(opcode, owner, name, desc);
262:                }
263:            }
264:
265:            public void visitMethodInsn(final int opcode, final String owner,
266:                    final String name, final String desc) {
267:                buf.setLength(0);
268:                buf.append(tab2).append(OPCODES[opcode]).append(' ');
269:                appendDescriptor(INTERNAL_NAME, owner);
270:                buf.append('.').append(name).append(' ');
271:                appendDescriptor(METHOD_DESCRIPTOR, desc);
272:                buf.append('\n');
273:                text.add(buf.toString());
274:
275:                if (mv != null) {
276:                    mv.visitMethodInsn(opcode, owner, name, desc);
277:                }
278:            }
279:
280:            public void visitJumpInsn(final int opcode, final Label label) {
281:                buf.setLength(0);
282:                buf.append(tab2).append(OPCODES[opcode]).append(' ');
283:                appendLabel(label);
284:                buf.append('\n');
285:                text.add(buf.toString());
286:
287:                if (mv != null) {
288:                    mv.visitJumpInsn(opcode, label);
289:                }
290:            }
291:
292:            public void visitLabel(final Label label) {
293:                buf.setLength(0);
294:                buf.append(ltab);
295:                appendLabel(label);
296:                buf.append('\n');
297:                text.add(buf.toString());
298:
299:                if (mv != null) {
300:                    mv.visitLabel(label);
301:                }
302:            }
303:
304:            public void visitLdcInsn(final Object cst) {
305:                buf.setLength(0);
306:                buf.append(tab2).append("LDC ");
307:                if (cst instanceof  String) {
308:                    AbstractVisitor.appendString(buf, (String) cst);
309:                } else if (cst instanceof  Type) {
310:                    buf.append(((Type) cst).getDescriptor() + ".class");
311:                } else {
312:                    buf.append(cst);
313:                }
314:                buf.append('\n');
315:                text.add(buf.toString());
316:
317:                if (mv != null) {
318:                    mv.visitLdcInsn(cst);
319:                }
320:            }
321:
322:            public void visitIincInsn(final int var, final int increment) {
323:                buf.setLength(0);
324:                buf.append(tab2).append("IINC ").append(var).append(' ')
325:                        .append(increment).append('\n');
326:                text.add(buf.toString());
327:
328:                if (mv != null) {
329:                    mv.visitIincInsn(var, increment);
330:                }
331:            }
332:
333:            public void visitTableSwitchInsn(final int min, final int max,
334:                    final Label dflt, final Label labels[]) {
335:                buf.setLength(0);
336:                buf.append(tab2).append("TABLESWITCH\n");
337:                for (int i = 0; i < labels.length; ++i) {
338:                    buf.append(tab3).append(min + i).append(": ");
339:                    appendLabel(labels[i]);
340:                    buf.append('\n');
341:                }
342:                buf.append(tab3).append("default: ");
343:                appendLabel(dflt);
344:                buf.append('\n');
345:                text.add(buf.toString());
346:
347:                if (mv != null) {
348:                    mv.visitTableSwitchInsn(min, max, dflt, labels);
349:                }
350:            }
351:
352:            public void visitLookupSwitchInsn(final Label dflt,
353:                    final int keys[], final Label labels[]) {
354:                buf.setLength(0);
355:                buf.append(tab2).append("LOOKUPSWITCH\n");
356:                for (int i = 0; i < labels.length; ++i) {
357:                    buf.append(tab3).append(keys[i]).append(": ");
358:                    appendLabel(labels[i]);
359:                    buf.append('\n');
360:                }
361:                buf.append(tab3).append("default: ");
362:                appendLabel(dflt);
363:                buf.append('\n');
364:                text.add(buf.toString());
365:
366:                if (mv != null) {
367:                    mv.visitLookupSwitchInsn(dflt, keys, labels);
368:                }
369:            }
370:
371:            public void visitMultiANewArrayInsn(final String desc,
372:                    final int dims) {
373:                buf.setLength(0);
374:                buf.append(tab2).append("MULTIANEWARRAY ");
375:                appendDescriptor(FIELD_DESCRIPTOR, desc);
376:                buf.append(' ').append(dims).append('\n');
377:                text.add(buf.toString());
378:
379:                if (mv != null) {
380:                    mv.visitMultiANewArrayInsn(desc, dims);
381:                }
382:            }
383:
384:            public void visitTryCatchBlock(final Label start, final Label end,
385:                    final Label handler, final String type) {
386:                buf.setLength(0);
387:                buf.append(tab2).append("TRYCATCHBLOCK ");
388:                appendLabel(start);
389:                buf.append(' ');
390:                appendLabel(end);
391:                buf.append(' ');
392:                appendLabel(handler);
393:                buf.append(' ');
394:                appendDescriptor(INTERNAL_NAME, type);
395:                buf.append('\n');
396:                text.add(buf.toString());
397:
398:                if (mv != null) {
399:                    mv.visitTryCatchBlock(start, end, handler, type);
400:                }
401:            }
402:
403:            public void visitLocalVariable(final String name,
404:                    final String desc, final String signature,
405:                    final Label start, final Label end, final int index) {
406:                buf.setLength(0);
407:                buf.append(tab2).append("LOCALVARIABLE ").append(name).append(
408:                        ' ');
409:                appendDescriptor(FIELD_DESCRIPTOR, desc);
410:                buf.append(' ');
411:                appendLabel(start);
412:                buf.append(' ');
413:                appendLabel(end);
414:                buf.append(' ').append(index).append('\n');
415:
416:                if (signature != null) {
417:                    buf.append(tab2);
418:                    appendDescriptor(FIELD_SIGNATURE, signature);
419:
420:                    TraceSignatureVisitor sv = new TraceSignatureVisitor(0);
421:                    SignatureReader r = new SignatureReader(signature);
422:                    r.acceptType(sv);
423:                    buf.append(tab2).append("// declaration: ").append(
424:                            sv.getDeclaration()).append('\n');
425:                }
426:                text.add(buf.toString());
427:
428:                if (mv != null) {
429:                    mv.visitLocalVariable(name, desc, signature, start, end,
430:                            index);
431:                }
432:            }
433:
434:            public void visitLineNumber(final int line, final Label start) {
435:                buf.setLength(0);
436:                buf.append(tab2).append("LINENUMBER ").append(line).append(' ');
437:                appendLabel(start);
438:                buf.append('\n');
439:                text.add(buf.toString());
440:
441:                if (mv != null) {
442:                    mv.visitLineNumber(line, start);
443:                }
444:            }
445:
446:            public void visitMaxs(final int maxStack, final int maxLocals) {
447:                buf.setLength(0);
448:                buf.append(tab2).append("MAXSTACK = ").append(maxStack).append(
449:                        '\n');
450:                text.add(buf.toString());
451:
452:                buf.setLength(0);
453:                buf.append(tab2).append("MAXLOCALS = ").append(maxLocals)
454:                        .append('\n');
455:                text.add(buf.toString());
456:
457:                if (mv != null) {
458:                    mv.visitMaxs(maxStack, maxLocals);
459:                }
460:            }
461:
462:            public void visitEnd() {
463:                super .visitEnd();
464:
465:                if (mv != null) {
466:                    mv.visitEnd();
467:                }
468:            }
469:
470:            // ------------------------------------------------------------------------
471:            // Utility methods
472:            // ------------------------------------------------------------------------
473:
474:            private void appendFrameTypes(final int n, final Object[] o) {
475:                for (int i = 0; i < n; ++i) {
476:                    if (i > 0) {
477:                        buf.append(' ');
478:                    }
479:                    if (o[i] instanceof  String) {
480:                        String desc = (String) o[i];
481:                        if (desc.startsWith("[")) {
482:                            appendDescriptor(FIELD_DESCRIPTOR, desc);
483:                        } else {
484:                            appendDescriptor(INTERNAL_NAME, desc);
485:                        }
486:                    } else if (o[i] instanceof  Integer) {
487:                        switch (((Integer) o[i]).intValue()) {
488:                        case 0:
489:                            appendDescriptor(FIELD_DESCRIPTOR, "T");
490:                            break;
491:                        case 1:
492:                            appendDescriptor(FIELD_DESCRIPTOR, "I");
493:                            break;
494:                        case 2:
495:                            appendDescriptor(FIELD_DESCRIPTOR, "F");
496:                            break;
497:                        case 3:
498:                            appendDescriptor(FIELD_DESCRIPTOR, "D");
499:                            break;
500:                        case 4:
501:                            appendDescriptor(FIELD_DESCRIPTOR, "J");
502:                            break;
503:                        case 5:
504:                            appendDescriptor(FIELD_DESCRIPTOR, "N");
505:                            break;
506:                        case 6:
507:                            appendDescriptor(FIELD_DESCRIPTOR, "U");
508:                            break;
509:                        }
510:                    } else {
511:                        appendLabel((Label) o[i]);
512:                    }
513:                }
514:            }
515:
516:            /**
517:             * Appends the name of the given label to {@link #buf buf}. Creates a new
518:             * label name if the given label does not yet have one.
519:             * 
520:             * @param l a label.
521:             */
522:            protected void appendLabel(final Label l) {
523:                String name = (String) labelNames.get(l);
524:                if (name == null) {
525:                    name = "L" + labelNames.size();
526:                    labelNames.put(l, name);
527:                }
528:                buf.append(name);
529:            }
530:        }
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