Examples of org.apache.xbean.asm4.ClassWriter

org.apache.xbean.asm4.MethodVisitor

        }


        // push the method definition
        int modifier = modifiers & (Opcodes.ACC_PUBLIC | Opcodes.ACC_PROTECTED);


        MethodVisitor mv = cw.visitMethod(modifier, method.getName(), Type.getMethodDescriptor(method), null, null);
        mv.visitCode();


        // push try/catch block, to catch declared exceptions, and to catch java.lang.Throwable
        final Label l0 = new Label();
        final Label l1 = new Label();
        final Label l2 = new Label();


        if (exceptionTypes.length > 0)
        {
            mv.visitTryCatchBlock(l0, l1, l2, "java/lang/reflect/InvocationTargetException");
        }


        // push try code
        mv.visitLabel(l0);
        final String classNameToOverride = method.getDeclaringClass().getName().replace('.', '/');
        mv.visitLdcInsn(Type.getType("L" + classNameToOverride + ";"));


        // the following code generates the bytecode for this line of Java:
        // Method method = <proxy>.class.getMethod("add", new Class[] { <array of function argument classes> });


        // get the method name to invoke, and push to stack
        mv.visitLdcInsn(method.getName());


        // create the Class[]
        createArrayDefinition(mv, parameterTypes.length, Class.class);


        int length = 1;


        // push parameters into array
        for (int i = 0; i < parameterTypes.length; i++)
        {
            // keep copy of array on stack
            mv.visitInsn(Opcodes.DUP);


            final Class<?> parameterType = parameterTypes[i];


            // push number onto stack
            pushIntOntoStack(mv, i);


            if (parameterType.isPrimitive())
            {
                String wrapperType = getWrapperType(parameterType);
                mv.visitFieldInsn(Opcodes.GETSTATIC, wrapperType, "TYPE", "Ljava/lang/Class;");
            }
            else
            {
                mv.visitLdcInsn(Type.getType(parameterType));
            }


            mv.visitInsn(Opcodes.AASTORE);


            if (Long.TYPE.equals(parameterType) || Double.TYPE.equals(parameterType))
            {
                length += 2;
            }
            else
            {
                length++;
            }
        }


        // the following code generates bytecode equivalent to:
        // return ((<returntype>) invocationHandler.invoke(this, {methodIndex}, new Object[] { <function arguments }))[.<primitive>Value()];


        final Label l4 = new Label();
        mv.visitLabel(l4);


        mv.visitVarInsn(Opcodes.ALOAD, 0);


        // get the invocationHandler field from this class
        mv.visitFieldInsn(Opcodes.GETFIELD, proxyClassFileName, FIELD_INTERCEPTOR_HANDLER, Type.getDescriptor(InterceptorHandler.class));


        // add the Method from the static array as first parameter
        mv.visitFieldInsn(Opcodes.GETSTATIC, proxyClassFileName, FIELD_INTERCEPTED_METHODS, Type.getDescriptor(Method[].class));


        // push the methodIndex of the current method
        mv.visitIntInsn(Opcodes.BIPUSH, methodIndex);


        // and now load the Method from the array
        mv.visitInsn(Opcodes.AALOAD);




        // prepare the parameter array as Object[] and store it on the stack
        pushMethodParameterArray(mv, parameterTypes);




        // invoke the invocationHandler
        mv.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(InterceptorHandler.class), "invoke",
                "(Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;");


        // cast the result
        mv.visitTypeInsn(Opcodes.CHECKCAST, getCastType(returnType));


        if (returnType.isPrimitive() && (!Void.TYPE.equals(returnType)))
        {
            // get the primitive value
            mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, getWrapperType(returnType), getPrimitiveMethod(returnType),
                    "()" + Type.getDescriptor(returnType));
        }


        // push return
        mv.visitLabel(l1);
        if (!Void.TYPE.equals(returnType))
        {
            mv.visitInsn(getReturnInsn(returnType));
        }
        else
        {
            mv.visitInsn(Opcodes.POP);
            mv.visitInsn(Opcodes.RETURN);
        }


        // catch InvocationTargetException
        if (exceptionTypes.length > 0)
        {
            mv.visitLabel(l2);
            mv.visitVarInsn(Opcodes.ASTORE, length);


            final Label l5 = new Label();
            mv.visitLabel(l5);


            for (int i = 0; i < exceptionTypes.length; i++)
            {
                final Class<?> exceptionType = exceptionTypes[i];


                mv.visitLdcInsn(Type.getType("L" + exceptionType.getCanonicalName().replace('.', '/') + ";"));
                mv.visitVarInsn(Opcodes.ALOAD, length);
                mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause",
                        "()Ljava/lang/Throwable;");
                mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;");
                mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z");


                final Label l6 = new Label();
                mv.visitJumpInsn(Opcodes.IFEQ, l6);


                final Label l7 = new Label();
                mv.visitLabel(l7);


                mv.visitVarInsn(Opcodes.ALOAD, length);
                mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause",
                        "()Ljava/lang/Throwable;");
                mv.visitTypeInsn(Opcodes.CHECKCAST, getCastType(exceptionType));
                mv.visitInsn(Opcodes.ATHROW);
                mv.visitLabel(l6);


                if (i == (exceptionTypes.length - 1))
                {
                    mv.visitTypeInsn(Opcodes.NEW, "java/lang/reflect/UndeclaredThrowableException");
                    mv.visitInsn(Opcodes.DUP);
                    mv.visitVarInsn(Opcodes.ALOAD, length);
                    mv.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/reflect/UndeclaredThrowableException", "<init>",
                            "(Ljava/lang/Throwable;)V");
                    mv.visitInsn(Opcodes.ATHROW);
                }
            }
        }


        // finish this method
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

View Full Code Here

                parentClassFileName = classFileName;
                superDefaultCt = classToProxy.getConstructor(null);
            }


            final String descriptor = Type.getConstructorDescriptor(superDefaultCt);
            final MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", descriptor, null, null);
            mv.visitCode();
            mv.visitVarInsn(Opcodes.ALOAD, 0);
            mv.visitMethodInsn(Opcodes.INVOKESPECIAL, parentClassFileName, "<init>", descriptor);


            mv.visitInsn(Opcodes.RETURN);
            mv.visitMaxs(-1, -1);
            mv.visitEnd();
        }
        catch (NoSuchMethodException e)
        {
            throw new ProxyGenerationException(e);
        }

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                exceptionTypeNames[i] = Type.getType(exceptionTypes[i]).getInternalName();
            }


            int targetModifiers = delegatedMethod.getModifiers() & (Modifier.PROTECTED | Modifier.PUBLIC);


            MethodVisitor mv = cw.visitMethod(targetModifiers, delegatedMethod.getName(), methodDescriptor, null, exceptionTypeNames);


            // fill method body
            mv.visitCode();


            boolean abstractMethod = Modifier.isAbstract(delegatedMethod.getModifiers());


            // now calculate the parameters
            int offset = 1;
            for (Class<?> aClass : delegatedMethod.getParameterTypes())
            {
                final Type type = Type.getType(aClass);
                mv.visitVarInsn(type.getOpcode(Opcodes.ILOAD), offset);
                offset += type.getSize();
            }


            // and finally invoke the target method on the provided Contextual Instance
            final Type declaringClass = Type.getType(delegatedMethod.getDeclaringClass());
            if (abstractMethod)
            {
                // generate an empty return block
            }
            else
            {
                // invoke the method on the super class;
                mv.visitMethodInsn(Opcodes.INVOKESPECIAL, declaringClass.getInternalName(), delegatedMethod.getName(), methodDescriptor);
            }


            generateReturn(mv, delegatedMethod);


            mv.visitMaxs(-1, -1);


            mv.visitEnd();
        }
    }

View Full Code Here

     * @param ejbCreate The matching ejbCreate method.  The post create method
     *                  will match this one in terms of method signature.
     */
    public void createEjbPostCreate(String ejbPostCreateName, Method ejbCreate) {
        String methodDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, Type.getArgumentTypes(ejbCreate));
        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, ejbPostCreateName, methodDescriptor, null, null);
        mv.visitCode();
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(0, ejbCreate.getParameterTypes().length + 1);
        mv.visitEnd();
    }

View Full Code Here

            modifier = ACC_PUBLIC;
        } else if (Modifier.isProtected(modifiers)) {
            modifier = ACC_PROTECTED;
        }


        final MethodVisitor mv = cw.visitMethod(modifier, method.getName(), getMethodSignatureAsString(returnType, parameterTypes), null, null);
        mv.visitCode();


        // push try/catch block, to catch declared exceptions, and to catch java.lang.Throwable
        final Label l0 = new Label();
        final Label l1 = new Label();
        final Label l2 = new Label();


        if (exceptionTypes.length > 0) {
            mv.visitTryCatchBlock(l0, l1, l2, "java/lang/reflect/InvocationTargetException");
        }


        // push try code
        mv.visitLabel(l0);
        final String classNameToOverride = method.getDeclaringClass().getName().replace('.', '/');
        mv.visitLdcInsn(Type.getType("L" + classNameToOverride + ";"));


        // the following code generates the bytecode for this line of Java:
        // Method method = <proxy>.class.getMethod("add", new Class[] { <array of function argument classes> });


        // get the method name to invoke, and push to stack
        mv.visitLdcInsn(method.getName());


        // create the Class[]
        createArrayDefinition(mv, parameterTypes.length, Class.class);


        int length = 1;


        // push parameters into array
        for (int i = 0; i < parameterTypes.length; i++) {
            // keep copy of array on stack
            mv.visitInsn(DUP);


            final Class<?> parameterType = parameterTypes[i];


            // push number onto stack
            pushIntOntoStack(mv, i);


            if (parameterType.isPrimitive()) {
                final String wrapperType = getWrapperType(parameterType);
                mv.visitFieldInsn(GETSTATIC, wrapperType, "TYPE", "Ljava/lang/Class;");
            } else {
                mv.visitLdcInsn(Type.getType(getAsmTypeAsString(parameterType, true)));
            }


            mv.visitInsn(AASTORE);


            if (Long.TYPE.equals(parameterType) || Double.TYPE.equals(parameterType)) {
                length += 2;
            } else {
                length++;
            }
        }


        // invoke getMethod() with the method name and the array of types
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getDeclaredMethod", "(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;");


        // store the returned method for later
        mv.visitVarInsn(ASTORE, length);


        // the following code generates bytecode equivalent to:
        // return ((<returntype>) invocationHandler.invoke(this, method, new Object[] { <function arguments }))[.<primitive>Value()];


        final Label l4 = new Label();
        mv.visitLabel(l4);
        mv.visitVarInsn(ALOAD, 0);


        // get the invocationHandler field from this class
        mv.visitFieldInsn(GETFIELD, proxyName, handlerName, "Ljava/lang/reflect/InvocationHandler;");


        // we want to pass "this" in as the first parameter
        mv.visitVarInsn(ALOAD, 0);


        // and the method we fetched earlier
        mv.visitVarInsn(ALOAD, length);


        // need to construct the array of objects passed in


        // create the Object[]
        createArrayDefinition(mv, parameterTypes.length, Object.class);


        int index = 1;
        // push parameters into array
        for (int i = 0; i < parameterTypes.length; i++) {
            // keep copy of array on stack
            mv.visitInsn(DUP);


            final Class<?> parameterType = parameterTypes[i];


            // push number onto stack
            pushIntOntoStack(mv, i);


            if (parameterType.isPrimitive()) {
                final String wrapperType = getWrapperType(parameterType);
                mv.visitVarInsn(getVarInsn(parameterType), index);


                mv.visitMethodInsn(INVOKESTATIC, wrapperType, "valueOf", "(" + getPrimitiveLetter(parameterType) + ")L" + wrapperType + ";");
                mv.visitInsn(AASTORE);


                if (Long.TYPE.equals(parameterType) || Double.TYPE.equals(parameterType)) {
                    index += 2;
                } else {
                    index++;
                }
            } else {
                mv.visitVarInsn(ALOAD, index);
                mv.visitInsn(AASTORE);
                index++;
            }
        }


        // invoke the invocationHandler
        mv.visitMethodInsn(INVOKEINTERFACE, "java/lang/reflect/InvocationHandler", "invoke", "(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;");


        // cast the result
        mv.visitTypeInsn(CHECKCAST, getCastType(returnType));


        if (returnType.isPrimitive() && (!Void.TYPE.equals(returnType))) {
            // get the primitive value
            mv.visitMethodInsn(INVOKEVIRTUAL, getWrapperType(returnType), getPrimitiveMethod(returnType), "()" + getPrimitiveLetter(returnType));
        }


        // push return
        mv.visitLabel(l1);
        if (!Void.TYPE.equals(returnType)) {
            mv.visitInsn(getReturnInsn(returnType));
        } else {
            mv.visitInsn(POP);
            mv.visitInsn(RETURN);
        }


        // catch InvocationTargetException
        if (exceptionTypes.length > 0) {
            mv.visitLabel(l2);
            mv.visitVarInsn(ASTORE, length);


            final Label l5 = new Label();
            mv.visitLabel(l5);


            for (int i = 0; i < exceptionTypes.length; i++) {
                final Class<?> exceptionType = exceptionTypes[i];


                mv.visitLdcInsn(Type.getType("L" + exceptionType.getName().replace('.', '/') + ";"));
                mv.visitVarInsn(ALOAD, length);
                mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;");
                mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;");
                mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z");


                final Label l6 = new Label();
                mv.visitJumpInsn(IFEQ, l6);


                final Label l7 = new Label();
                mv.visitLabel(l7);


                mv.visitVarInsn(ALOAD, length);
                mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;");
                mv.visitTypeInsn(CHECKCAST, exceptionType.getName().replace('.', '/'));
                mv.visitInsn(ATHROW);
                mv.visitLabel(l6);


                if (i == (exceptionTypes.length - 1)) {
                    mv.visitTypeInsn(NEW, "java/lang/reflect/UndeclaredThrowableException");
                    mv.visitInsn(DUP);
                    mv.visitVarInsn(ALOAD, length);
                    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/reflect/UndeclaredThrowableException", "<init>", "(Ljava/lang/Throwable;)V");
                    mv.visitInsn(ATHROW);
                }
            }
        }


        // finish this method
        mv.visitMaxs(0, 0);
        return mv;
    }

View Full Code Here

     * @param ejbCreate The matching ejbCreate method.  The post create method
     *                  will match this one in terms of method signature.
     */
    public void createEjbPostCreate(String ejbPostCreateName, Method ejbCreate) {
        String methodDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, Type.getArgumentTypes(ejbCreate));
        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, ejbPostCreateName, methodDescriptor, null, null);
        mv.visitCode();
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(0, ejbCreate.getParameterTypes().length + 1);
        mv.visitEnd();
    }

View Full Code Here

    private void createSelectMethod(Method selectMethod) {
        Class<?> returnType = selectMethod.getReturnType(); 
        
        Method executeMethod = EjbSelect.getSelectMethod(returnType); 
        
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, selectMethod.getName(), Type.getMethodDescriptor(selectMethod), null, getExceptionTypes(selectMethod));
        mv.visitCode();


        // push deploymentInfo
        mv.visitFieldInsn(GETSTATIC, implClassName, "deploymentInfo", "Ljava/lang/Object;");


        // push method signature
        mv.visitLdcInsn(getSelectMethodSignature(selectMethod));


        // push return type, but only if the executeMethod is not going to be for void or 
        // one of the primitives. 
        if (!returnType.isPrimitive()) {
            mv.visitLdcInsn(returnType.getName());
        }


        // new Object[]
        mv.visitIntInsn(BIPUSH, selectMethod.getParameterTypes().length);
        mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");


        // object[i] = arg${i}
        int i = 0;
        for (Class<?> parameterType : selectMethod.getParameterTypes()) {
            // push arguement i on stack
            mv.visitInsn(DUP);
            bipush(mv, i);
            mv.visitVarInsn(Type.getType(parameterType).getOpcode(ILOAD), i + 1);


            // convert argument on stack to an Object
            Convert.toObjectFrom(mv, parameterType);


            // store it into the array
            mv.visitInsn(AASTORE);


            if (long.class.equals(parameterType) || double.class.equals(parameterType)) {
                // longs and doubles are double wide
                i = i + 2;
            } else {
                i++;
            }
        }


        // EjbSelect.execute_xxxx(deploymentInfo, signature, [returnType.] args[]);
        mv.visitMethodInsn(INVOKESTATIC,
                Type.getInternalName(executeMethod.getDeclaringClass()),
                executeMethod.getName(),
                Type.getMethodDescriptor(executeMethod));


        // if this is a void type, we just return.  Otherwise, the return type 
        // needs to match the type returned from the method call 
        if (!Void.TYPE.equals(returnType)) {
            // if this is a non-primitive return type, then the returned 
            // object will need to be cast to the appropriate return type for 
            // the verifier.  The primitive types all have the proper type on the 
            // stack already 
            if (!returnType.isPrimitive()) {
                // convert return type
                Convert.fromObjectTo(mv, returnType);
            }
            
            // And generate the appropriate return for the type 
            mv.visitInsn(Type.getReturnType(selectMethod).getOpcode(IRETURN));
        } else {
            // void return is just a RETURN. 
            mv.visitInsn(RETURN);
        }


        // close method
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

View Full Code Here

        }


    }


    public void createEjbActivate() {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "ejbActivate", "()V", null, null);
        mv.visitCode();
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 1);
        mv.visitEnd();
    }

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        mv.visitMaxs(0, 1);
        mv.visitEnd();
    }


    public void createEjbLoad() {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "ejbLoad", "()V", null, null);
        mv.visitCode();
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 1);
        mv.visitEnd();
    }

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        mv.visitMaxs(0, 1);
        mv.visitEnd();
    }


    public void createEjbPassivate() {
        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "ejbPassivate", "()V", null, null);
        mv.visitCode();
        mv.visitInsn(RETURN);
        mv.visitMaxs(0, 1);
        mv.visitEnd();
    }

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