Source Code Cross Referenced for HandlerVisitor.java in  » Net » Terracotta » com » tc » aspectwerkz » transform » inlining » weaver » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » Terracotta » com.tc.aspectwerkz.transform.inlining.weaver 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * All content copyright (c) 2003-2006 Terracotta, Inc., except as may otherwise be noted in a separate copyright notice.  All rights reserved.
003:         */
004:        package com.tc.aspectwerkz.transform.inlining.weaver;
005:
006:        import com.tc.asm.ClassAdapter;
007:        import com.tc.asm.ClassVisitor;
008:        import com.tc.asm.MethodVisitor;
009:        import com.tc.asm.MethodAdapter;
010:        import com.tc.asm.Label;
011:        import com.tc.asm.Type;
012:
013:        import com.tc.aspectwerkz.definition.SystemDefinition;
014:        import com.tc.aspectwerkz.joinpoint.management.JoinPointType;
015:        import com.tc.aspectwerkz.reflect.impl.asm.AsmClassInfo;
016:        import com.tc.aspectwerkz.reflect.ClassInfo;
017:        import com.tc.aspectwerkz.reflect.MemberInfo;
018:        import com.tc.aspectwerkz.transform.InstrumentationContext;
019:        import com.tc.aspectwerkz.transform.TransformationConstants;
020:        import com.tc.aspectwerkz.transform.TransformationUtil;
021:        import com.tc.aspectwerkz.transform.inlining.AsmHelper;
022:        import com.tc.aspectwerkz.transform.inlining.EmittedJoinPoint;
023:        import com.tc.aspectwerkz.expression.ExpressionContext;
024:        import com.tc.aspectwerkz.expression.PointcutType;
025:
026:        import java.util.Iterator;
027:        import java.util.Set;
028:        import java.util.ArrayList;
029:        import java.util.List;
030:        import java.util.Map;
031:        import java.util.HashMap;
032:        import java.lang.reflect.Modifier;
033:
034:        /**
035:         * Advises catch clauses by inserting a call to the join point as the first thing in the catch block.
036:         *
037:         * @author <a href="mailto:alex AT gnilux DOT com">Alexandre Vasseur</a>
038:         * 
039:         * TODO in ASM 2.x and later try/catch blocks are visited before method code, so this adapter is not needed
040:         */
041:        public class HandlerVisitor extends ClassAdapter implements 
042:                TransformationConstants {
043:
044:            /**
045:             * A visitor that looks for all catch clause and keep track of them
046:             * providing that they match
047:             */
048:            public static class LookaheadCatchLabelsClassAdapter extends
049:                    ClassAdapter {
050:
051:                /**
052:                 * list of CatchLabelStruct that matches
053:                 */
054:                List m_catchLabels = new ArrayList();
055:
056:                /**
057:                 * map of Integer(index in whole class)-->asm.Label for all the visited labels
058:                 */
059:                private final Map m_labelIndexes = new HashMap();
060:
061:                /**
062:                 * current label index in whole class, from 0 to N
063:                 */
064:                private int m_labelIndex = -1;
065:
066:                private final InstrumentationContext m_ctx;
067:                private final ClassLoader m_loader;
068:                private final ClassInfo m_callerClassInfo;
069:
070:                /**
071:                 * Visit the class
072:                 *
073:                 * @param cv
074:                 * @param loader
075:                 * @param callerClassInfo
076:                 * @param ctx
077:                 * @param catchLabels
078:                 */
079:                public LookaheadCatchLabelsClassAdapter(ClassVisitor cv,
080:                        ClassLoader loader, ClassInfo callerClassInfo,
081:                        InstrumentationContext ctx, List catchLabels) {
082:                    super (cv);
083:                    m_catchLabels = catchLabels;
084:                    m_loader = loader;
085:                    m_callerClassInfo = callerClassInfo;
086:                    m_ctx = ctx;
087:                }
088:
089:                /**
090:                 * Visit method bodies
091:                 *
092:                 * @param access
093:                 * @param callerMethodName
094:                 * @param callerMethodDesc
095:                 * @param exceptions
096:                 * @return
097:                 */
098:                public MethodVisitor visitMethod(final int access,
099:                        final String callerMethodName,
100:                        final String callerMethodDesc,
101:                        final String callerMethodsignature,
102:                        final String[] exceptions) {
103:                    if (callerMethodName.startsWith(WRAPPER_METHOD_PREFIX)) {
104:                        return super .visitMethod(access, callerMethodName,
105:                                callerMethodDesc, callerMethodsignature,
106:                                exceptions);
107:                    }
108:
109:                    MethodVisitor mv = cv
110:                            .visitMethod(access, callerMethodName,
111:                                    callerMethodDesc, callerMethodsignature,
112:                                    exceptions);
113:                    if (mv == null) {
114:                        return mv;
115:                    }
116:
117:                    final MemberInfo callerMemberInfo;
118:                    if (CLINIT_METHOD_NAME.equals(callerMethodName)) {
119:                        callerMemberInfo = m_callerClassInfo
120:                                .staticInitializer();
121:                    } else if (INIT_METHOD_NAME.equals(callerMethodName)) {
122:                        int hash = AsmHelper
123:                                .calculateConstructorHash(callerMethodDesc);
124:                        callerMemberInfo = m_callerClassInfo
125:                                .getConstructor(hash);
126:                    } else {
127:                        int hash = AsmHelper.calculateMethodHash(
128:                                callerMethodName, callerMethodDesc);
129:                        callerMemberInfo = m_callerClassInfo.getMethod(hash);
130:                    }
131:                    if (callerMemberInfo == null) {
132:                        System.err
133:                                .println("AW::WARNING "
134:                                        + "metadata structure could not be build for method ["
135:                                        + m_callerClassInfo.getName().replace(
136:                                                '/', '.') + '.'
137:                                        + callerMethodName + ':'
138:                                        + callerMethodDesc + ']');
139:                        return mv;
140:                    }
141:
142:                    return new LookaheadCatchLabelsMethodAdapter(mv,
143:                            callerMemberInfo, this );
144:                }
145:            }
146:
147:            /**
148:             * Visit the method, and keep track of all labels so that when visittryCatch is reached
149:             * we can remember the index
150:             */
151:            static final class LookaheadCatchLabelsMethodAdapter extends
152:                    MethodAdapter {
153:                private final MemberInfo info;
154:                private final LookaheadCatchLabelsClassAdapter classAdapter;
155:
156:                LookaheadCatchLabelsMethodAdapter(MethodVisitor mv,
157:                        MemberInfo info,
158:                        LookaheadCatchLabelsClassAdapter classAdapter) {
159:                    super (mv);
160:                    this .info = info;
161:                    this .classAdapter = classAdapter;
162:                }
163:
164:                public void visitLabel(Label label) {
165:                    classAdapter.m_labelIndexes.put(label, new Integer(
166:                            ++classAdapter.m_labelIndex));
167:                    super .visitLabel(label);
168:                }
169:
170:                public void visitTryCatchBlock(Label startLabel,
171:                        Label endLabel, Label handlerLabel,
172:                        String exceptionTypeName) {
173:                    if (exceptionTypeName == null) {
174:                        // finally block
175:                        super .visitTryCatchBlock(startLabel, endLabel,
176:                                handlerLabel, exceptionTypeName);
177:                        return;
178:                    }
179:                    final ClassInfo exceptionClassInfo = AsmClassInfo
180:                            .getClassInfo(exceptionTypeName,
181:                                    classAdapter.m_loader);
182:                    final ExpressionContext ctx = new ExpressionContext(
183:                            PointcutType.HANDLER, exceptionClassInfo, info);
184:                    if (!handlerFilter(classAdapter.m_ctx.getDefinitions(), ctx)) {
185:                        // remember its index and the exception exceptionClassInfo
186:                        Integer index = (Integer) classAdapter.m_labelIndexes
187:                                .get(handlerLabel);
188:                        if (index != null) {
189:                            classAdapter.m_catchLabels
190:                                    .add(new CatchLabelStruct(index.intValue(),
191:                                            exceptionClassInfo,
192:                                            classAdapter.m_callerClassInfo,
193:                                            info));
194:                        }
195:                    }
196:                    super .visitTryCatchBlock(startLabel, endLabel,
197:                            handlerLabel, exceptionTypeName);
198:                }
199:            }
200:
201:            //---- non lookahead visitor
202:
203:            private final InstrumentationContext m_ctx;
204:
205:            /**
206:             * List of matching catch clause
207:             */
208:            private final List m_catchLabels;
209:
210:            /**
211:             * catch clause index in whole class
212:             */
213:            private int m_labelIndex = -1;
214:
215:            private Label m_lastLabelForLineNumber = EmittedJoinPoint.NO_LINE_NUMBER;
216:
217:            /**
218:             * Creates a new instance.
219:             *
220:             * @param cv
221:             * @param ctx
222:             */
223:            public HandlerVisitor(final ClassVisitor cv,
224:                    final InstrumentationContext ctx, final List catchLabels) {
225:                super (cv);
226:                m_ctx = ctx;
227:                m_catchLabels = catchLabels;
228:            }
229:
230:            /**
231:             * Visits the methods bodies to weave in JP calls at catch clauses
232:             *
233:             * @param access
234:             * @param name
235:             * @param desc
236:             * @param signature
237:             * @param exceptions
238:             * @return
239:             */
240:            public MethodVisitor visitMethod(final int access,
241:                    final String name, final String desc,
242:                    final String signature, final String[] exceptions) {
243:                if (name.startsWith(WRAPPER_METHOD_PREFIX)) {
244:                    return super .visitMethod(access, name, desc, signature,
245:                            exceptions);
246:                }
247:
248:                MethodVisitor mv = cv.visitMethod(access, name, desc,
249:                        signature, exceptions);
250:                return mv == null ? null : new CatchClauseCodeAdapter(mv);
251:            }
252:
253:            /**
254:             * Advises catch clauses by inserting a call to the join point as the first thing in the catch block.
255:             *
256:             * @author <a href="mailto:alex AT gnilux DOT com">Alexandre Vasseur</a>
257:             */
258:            public class CatchClauseCodeAdapter extends MethodAdapter {
259:
260:                /**
261:                 * Creates a new instance.
262:                 *
263:                 * @param ca
264:                 */
265:                public CatchClauseCodeAdapter(final MethodVisitor ca) {
266:                    super (ca);
267:                }
268:
269:                public void visitLabel(Label label) {
270:                    m_lastLabelForLineNumber = label;
271:                    super .visitLabel(label);
272:
273:                    // check if it is a catch label
274:                    int index = ++m_labelIndex;
275:                    CatchLabelStruct catchLabel = null;
276:                    for (Iterator iterator = m_catchLabels.iterator(); iterator
277:                            .hasNext();) {
278:                        CatchLabelStruct aCatchLabel = (CatchLabelStruct) iterator
279:                                .next();
280:                        if (aCatchLabel.labelIndexInWholeClass == index) {
281:                            catchLabel = aCatchLabel;
282:                            break;
283:                        }
284:                    }
285:                    if (catchLabel == null) {
286:                        return;
287:                    }
288:                    // matched
289:                    m_ctx.markAsAdvised();
290:                    final String callerTypeName = catchLabel.caller.getName()
291:                            .replace('.', '/');
292:                    final String exceptionTypeDesc = catchLabel.exception
293:                            .getSignature();
294:                    final String exceptionTypeName = Type.getType(
295:                            exceptionTypeDesc).getInternalName();
296:                    final int joinPointHash = AsmHelper
297:                            .calculateClassHash(exceptionTypeDesc);
298:                    final String joinPointClassName = TransformationUtil
299:                            .getJoinPointClassName(callerTypeName,
300:                                    catchLabel.callerMember.getName(),
301:                                    catchLabel.callerMember.getSignature(),
302:                                    exceptionTypeName,
303:                                    JoinPointType.HANDLER_INT, joinPointHash);
304:
305:                    // add the call to the join point
306:                    // exception instance is on the stack
307:                    // dup it for ARG0
308:                    mv.visitInsn(DUP);
309:
310:                    // load caller instance if any
311:                    if (Modifier.isStatic(catchLabel.callerMember
312:                            .getModifiers())) {
313:                        mv.visitInsn(ACONST_NULL);
314:                    } else {
315:                        mv.visitVarInsn(ALOAD, 0);
316:                    }
317:                    //TODO for now we pass the exception as both CALLEE and ARG0 - may be callee must be NULL
318:                    //? check in AJ RTTI
319:                    mv.visitMethodInsn(INVOKESTATIC, joinPointClassName,
320:                            INVOKE_METHOD_NAME, TransformationUtil
321:                                    .getInvokeSignatureForHandlerJoinPoints(
322:                                            callerTypeName, exceptionTypeName));
323:
324:                    // emit the joinpoint
325:                    m_ctx.addEmittedJoinPoint(new EmittedJoinPoint(
326:                            JoinPointType.HANDLER_INT, callerTypeName,
327:                            catchLabel.callerMember.getName(),
328:                            catchLabel.callerMember.getSignature(),
329:                            catchLabel.callerMember.getModifiers(),
330:                            exceptionTypeName, "", exceptionTypeDesc,
331:                            0, // a bit meaningless but must not be static
332:                            joinPointHash, joinPointClassName,
333:                            m_lastLabelForLineNumber));
334:                }
335:            }
336:
337:            /**
338:             * Filters out the catch clauses that are not eligible for transformation.
339:             *
340:             * @param definitions
341:             * @param ctx
342:             * @return boolean true if the catch clause should be filtered out
343:             */
344:            static boolean handlerFilter(final Set definitions,
345:                    final ExpressionContext ctx) {
346:                for (Iterator it = definitions.iterator(); it.hasNext();) {
347:                    if (((SystemDefinition) it.next()).hasPointcut(ctx)) {
348:                        return false;
349:                    } else {
350:                        continue;
351:                    }
352:                }
353:                return true;
354:            }
355:
356:            /**
357:             * A struct to represent a catch clause.
358:             * The index is class wide, and the exception class info is kept.
359:             */
360:            static class CatchLabelStruct {
361:                int labelIndexInWholeClass = -1;
362:                ClassInfo exception = null;
363:                ClassInfo caller = null;
364:                MemberInfo callerMember = null;
365:
366:                CatchLabelStruct(int indexInClass, ClassInfo exception,
367:                        ClassInfo caller, MemberInfo callerMember) {
368:                    labelIndexInWholeClass = indexInClass;
369:                    this.exception = exception;
370:                    this.caller = caller;
371:                    this.callerMember = callerMember;
372:                }
373:            }
374:        }
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