Examples of javassist.expr.ExprEditor

javassist.expr.ExprEditor
A translator of method bodies.
The users can define a subclass of this class to customize how to modify a method body. The overall architecture is similar to the strategy pattern.
If instrument() is called in CtMethod, the method body is scanned from the beginning to the end. Whenever an expression, such as a method call and a new expression (object creation), is found, edit() is called in ExprEdit. edit() can inspect and modify the given expression. The modification is reflected on the original method body. If edit() does nothing, the original method body is not changed.
The following code is an example:
This code inspects all method calls appearing in the method represented by cm and it prints the names and the line numbers of the methods declared in class Point. This code does not modify the body of the method represented by cm. If the method body must be modified, call replace() in MethodCall. @see javassist.CtClass#instrument(ExprEditor) @see javassist.CtMethod#instrument(ExprEditor) @see javassist.CtConstructor#instrument(ExprEditor) @see MethodCall @see NewExpr @see FieldAccess @see javassist.CodeConverter

            // patch caller side of defineClass0
            // pre-call
            // byte[] besee =
            // com.gnilux.besee.hook.impl.ClassPreProcessorHelper.defineClass0Pre(this, $$);
            // <call> c = defineClass0(name, besee, 0, besee.length, protectionDomain);
            ExprEditor defineClass0Pre = new ExprEditor() {
                public void edit(MethodCall m) throws CannotCompileException {
                    if ("defineClass0".equals(m.getMethodName())) {
                        int argsCount = 5;


                        // For SUN VM, argCount = 5: name, byte[], int, int, ProtectionDomain

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            final CtClass ctClass = klass.getCtClass();
            ClassInfo classInfo = JavassistClassInfo.getClassInfo(ctClass, context.getLoader());
            if (classFilter(definition, new ExpressionContext(PointcutType.CALL, null, classInfo), ctClass)) {
                continue;
            }
            ctClass.instrument(new ExprEditor() {
                public void edit(NewExpr newExpr) throws CannotCompileException {
                    try {
                        CtBehavior where = null;
                        try {
                            where = newExpr.where();

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            final CtClass ctClass = klass.getCtClass();
            ClassInfo classInfo = JavassistClassInfo.getClassInfo(ctClass, context.getLoader());
            if (classFilter(definition, new ExpressionContext(PointcutType.CALL, null, classInfo), ctClass)) {
                continue;
            }
            ctClass.instrument(new ExprEditor() {
                public void edit(MethodCall methodCall) throws CannotCompileException {
                    // AW-228, super.callSomething(..) is not a valid join point
                    if (methodCall.isSuper()) {
                        return;
                    }

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            final ClassInfo classInfo = JavassistClassInfo.getClassInfo(ctClass, context.getLoader());
            if (classFilter(ctClass, new ExpressionContext(PointcutType.SET, classInfo, classInfo), definition)
                && classFilter(ctClass, new ExpressionContext(PointcutType.GET, classInfo, classInfo), definition)) {
                continue;
            }
            ctClass.instrument(new ExprEditor() {
                public void edit(FieldAccess fieldAccess) throws CannotCompileException {
                    try {
                        CtBehavior where = null;
                        try {
                            where = fieldAccess.where();

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            final CtClass ctClass = klass.getCtClass();
            ClassInfo classInfo = JavassistClassInfo.getClassInfo(ctClass, context.getLoader());
            if (classFilter(definition, new ExpressionContext(PointcutType.HANDLER, null, classInfo), ctClass)) {
                continue;
            }
            ctClass.instrument(new ExprEditor() {
                public void edit(Handler handlerExpr) throws CannotCompileException {
                    try {
                        CtClass exceptionClass = null;
                        try {
                            exceptionClass = handlerExpr.getType();

View Full Code Here


            // patch caller side of defineClass0
            // pre-call
            // byte[] besee = com.gnilux.besee.hook.impl.ClassPreProcessorHelper.defineClass0Pre(this, $$);
            // <call> c = defineClass0(name, besee, 0, besee.length, protectionDomain);
            ExprEditor defineClass0Pre = new ExprEditor() {
                public void edit(MethodCall m) throws CannotCompileException {
                    if ("defineClass0".equals(m.getMethodName())) {
                        int argsCount = 5;


                        // For SUN VM, argCount = 5: name, byte[], int, int, ProtectionDomain

View Full Code Here

            final CtClass ctClass = klass.getCtClass();
            ClassInfo classInfo = JavassistClassInfo.getClassInfo(ctClass, context.getLoader());
            if (classFilter(definition, new ExpressionContext(PointcutType.CALL, null, classInfo), ctClass)) {
                return;
            }
            ctClass.instrument(new ExprEditor() {
                public void edit(MethodCall methodCall) throws CannotCompileException {
                    try {
                        CtBehavior where = null;
                        try {
                            where = methodCall.where();

View Full Code Here

            if (classFilter(ctClass, new ExpressionContext(PointcutType.SET, classInfo, null), definition)
                && classFilter(ctClass, new ExpressionContext(PointcutType.GET, classInfo, null), definition)) {
                continue;
            }
            ctClass.instrument(
                    new ExprEditor() {
                        public void edit(FieldAccess fieldAccess) throws CannotCompileException {
                            try {
                                CtBehavior where = null;
                                try {
                                    where = fieldAccess.where();

View Full Code Here

            ClassInfo classInfo = JavassistClassInfo.getClassInfo(ctClass, context.getLoader());
            if (classFilter(definition, new ExpressionContext(PointcutType.CALL, classInfo, classInfo), ctClass)) {
                return;
            }
            ctClass.instrument(
                    new ExprEditor() {
                        public void edit(MethodCall methodCall) throws CannotCompileException {
                            try {
                                CtBehavior where = null;
                                try {
                                    where = methodCall.where();

View Full Code Here

            ClassInfo classInfo = JavassistClassInfo.getClassInfo(ctClass, context.getLoader());
            if (classFilter(definition, new ExpressionContext(PointcutType.HANDLER, classInfo, classInfo), ctClass)) {
                continue;
            }
            ctClass.instrument(
                    new ExprEditor() {
                        public void edit(Handler handlerExpr) throws CannotCompileException {
                            try {
                                CtClass exceptionClass = null;
                                try {
                                    exceptionClass = handlerExpr.getType();

View Full Code Here

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