Examples with MethodVisitor org.apache.xbean.asm6.MethodVisitor used on opensource projects

Example 1 with MethodVisitor

use of org.apache.xbean.asm6.MethodVisitor in project jodd by oblac.

the class ProxettaClassBuilder method makeProxyConstructor.

/**
	 * Creates init method that simply calls all advice constructor methods in correct order.
	 * This created init method is called from each destination's constructor.
	 */
protected void makeProxyConstructor() {
    MethodVisitor mv = wd.dest.visitMethod(AsmUtil.ACC_PRIVATE | AsmUtil.ACC_FINAL, initMethodName, DESC_VOID, null, null);
    mv.visitCode();
    if (wd.adviceInits != null) {
        for (String name : wd.adviceInits) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKESPECIAL, wd.thisReference, name, DESC_VOID, false);
        }
    }
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}

Example 2 with MethodVisitor

use of org.apache.xbean.asm6.MethodVisitor in project jodd by oblac.

the class ProxettaMethodBuilder method createProxyMethod.

/**
	 * Creates proxy methods over target method, For each matched proxy, new proxy method is created
	 * by taking advice bytecode and replaces usages of {@link jodd.proxetta.ProxyTarget}.
	 * <p>
	 * Invocation chain example: {@code name -> name$p0 -> name$p1 -> name$p4 -> super}.
	 */
public void createProxyMethod(final TargetMethodData td) {
    final ProxyAspectData aspectData = td.getProxyData();
    int access = td.msign.getAccessFlags();
    access &= ~ACC_NATIVE;
    access &= ~ACC_ABSTRACT;
    access = ProxettaAsmUtil.makePrivateFinalAccess(access);
    final MethodVisitor mv = wd.dest.visitMethod(access, td.methodName(), td.msign.getDescription(), null, null);
    mv.visitCode();
    //*** VISIT ADVICE - called for each aspect and each method
    aspectData.getAdviceClassReader().accept(new EmptyClassVisitor() {

        @Override
        public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
            if (!name.equals(executeMethodName)) {
                return null;
            }
            return new HistoryMethodAdapter(mv) {

                @Override
                public void visitFieldInsn(int opcode, String owner, String name, String desc) {
                    if (owner.equals(aspectData.adviceReference)) {
                        // [F5]
                        owner = wd.thisReference;
                        name = adviceFieldName(name, aspectData.aspectIndex);
                    }
                    super.visitFieldInsn(opcode, owner, name, desc);
                }

                @Override
                public void visitVarInsn(int opcode, int var) {
                    var += (var == 0 ? 0 : td.msign.getAllArgumentsSize());
                    if (proxyInfoRequested) {
                        proxyInfoRequested = false;
                        if (opcode == ASTORE) {
                            ProxyTargetReplacement.info(mv, td.msign, var);
                        }
                    }
                    // [F1]
                    super.visitVarInsn(opcode, var);
                }

                @Override
                public void visitIincInsn(int var, int increment) {
                    var += (var == 0 ? 0 : td.msign.getAllArgumentsSize());
                    // [F1]
                    super.visitIincInsn(var, increment);
                }

                @Override
                public void visitInsn(int opcode) {
                    if (opcode == ARETURN) {
                        visitReturn(mv, td.msign, true);
                        return;
                    }
                    if (traceNext) {
                        if ((opcode == POP) || (opcode == POP2)) {
                            // [F3] - invoke invoked without assignment
                            return;
                        }
                    }
                    super.visitInsn(opcode);
                }

                @SuppressWarnings({ "ParameterNameDiffersFromOverriddenParameter" })
                @Override
                public void visitMethodInsn(int opcode, String string, String mname, String mdesc, boolean isInterface) {
                    if ((opcode == INVOKEVIRTUAL) || (opcode == INVOKEINTERFACE) || (opcode == INVOKESPECIAL)) {
                        if (string.equals(aspectData.adviceReference)) {
                            string = wd.thisReference;
                            mname = adviceMethodName(mname, aspectData.aspectIndex);
                        }
                    } else if (opcode == INVOKESTATIC) {
                        if (string.equals(aspectData.adviceReference)) {
                            string = wd.thisReference;
                            mname = adviceMethodName(mname, aspectData.aspectIndex);
                        } else if (string.endsWith('/' + TARGET_CLASS_NAME)) {
                            if (isInvokeMethod(mname, mdesc)) {
                                // [R7]
                                if (td.isLastMethodInChain()) {
                                    if (!wd.isWrapper()) {
                                        // PROXY
                                        loadSpecialMethodArguments(mv, td.msign);
                                        mv.visitMethodInsn(INVOKESPECIAL, wd.superReference, td.msign.getMethodName(), td.msign.getDescription(), isInterface);
                                    } else {
                                        // WRAPPER
                                        mv.visitVarInsn(ALOAD, 0);
                                        mv.visitFieldInsn(GETFIELD, wd.thisReference, wd.wrapperRef, wd.wrapperType);
                                        loadVirtualMethodArguments(mv, td.msign);
                                        if (wd.wrapInterface) {
                                            mv.visitMethodInsn(INVOKEINTERFACE, wd.wrapperType.substring(1, wd.wrapperType.length() - 1), td.msign.getMethodName(), td.msign.getDescription(), true);
                                        } else {
                                            mv.visitMethodInsn(INVOKEVIRTUAL, wd.wrapperType.substring(1, wd.wrapperType.length() - 1), td.msign.getMethodName(), td.msign.getDescription(), isInterface);
                                        }
                                    }
                                    // [F4]
                                    prepareReturnValue(mv, td.msign, aspectData.maxLocalVarOffset);
                                    traceNext = true;
                                } else {
                                    // calls next proxy method
                                    loadSpecialMethodArguments(mv, td.msign);
                                    mv.visitMethodInsn(INVOKESPECIAL, wd.thisReference, td.nextMethodName(), td.msign.getDescription(), isInterface);
                                    visitReturn(mv, td.msign, false);
                                }
                                return;
                            }
                            if (isArgumentsCountMethod(mname, mdesc)) {
                                // [R2]
                                ProxyTargetReplacement.argumentsCount(mv, td.msign);
                                return;
                            }
                            if (isArgumentTypeMethod(mname, mdesc)) {
                                // [R3]
                                int argIndex = this.getArgumentIndex();
                                ProxyTargetReplacement.argumentType(mv, td.msign, argIndex);
                                return;
                            }
                            if (isArgumentMethod(mname, mdesc)) {
                                // [R4]
                                int argIndex = this.getArgumentIndex();
                                ProxyTargetReplacement.argument(mv, td.msign, argIndex);
                                return;
                            }
                            if (isSetArgumentMethod(mname, mdesc)) {
                                // [R5]
                                int argIndex = this.getArgumentIndex();
                                checkArgumentIndex(td.msign, argIndex);
                                mv.visitInsn(POP);
                                storeMethodArgumentFromObject(mv, td.msign, argIndex);
                                return;
                            }
                            if (isCreateArgumentsArrayMethod(mname, mdesc)) {
                                // [R6]
                                ProxyTargetReplacement.createArgumentsArray(mv, td.msign);
                                return;
                            }
                            if (isCreateArgumentsClassArrayMethod(mname, mdesc)) {
                                // [R11]
                                ProxyTargetReplacement.createArgumentsClassArray(mv, td.msign);
                                return;
                            }
                            if (isTargetMethod(mname, mdesc)) {
                                // [R9.1]
                                mv.visitVarInsn(ALOAD, 0);
                                return;
                            }
                            if (isTargetClassMethod(mname, mdesc)) {
                                // [R9]
                                ProxyTargetReplacement.targetClass(mv, td.msign);
                                //ProxyTargetReplacement.targetClass(mv, wd.superReference);
                                return;
                            }
                            if (isTargetMethodNameMethod(mname, mdesc)) {
                                // [R10]
                                ProxyTargetReplacement.targetMethodName(mv, td.msign);
                                return;
                            }
                            if (isTargetMethodSignatureMethod(mname, mdesc)) {
                                ProxyTargetReplacement.targetMethodSignature(mv, td.msign);
                                return;
                            }
                            if (isTargetMethodDescriptionMethod(mname, mdesc)) {
                                ProxyTargetReplacement.targetMethodDescription(mv, td.msign);
                                return;
                            }
                            if (isInfoMethod(mname, mdesc)) {
                                // we are NOT replacing info() here! First, we need to figure out
                                // what is the operand for the very next ASTORE instructions
                                // since we need to create an object and store it in this
                                // register - and reuse it, in replacement code.
                                //ProxyTargetReplacement.info(mv, td.msign);
                                proxyInfoRequested = true;
                                return;
                            }
                            if (isReturnTypeMethod(mname, mdesc)) {
                                // [R11]
                                ProxyTargetReplacement.returnType(mv, td.msign);
                                return;
                            }
                            if (isReturnValueMethod(mname, mdesc)) {
                                castToReturnType(mv, td.msign);
                                return;
                            }
                            if (isTargetMethodAnnotationMethod(mname, mdesc)) {
                                String[] args = getLastTwoStringArguments();
                                // pop current two args
                                mv.visitInsn(POP);
                                mv.visitInsn(POP);
                                ProxyTargetReplacement.targetMethodAnnotation(mv, td.msign, args);
                                return;
                            }
                            if (isTargetClassAnnotationMethod(mname, mdesc)) {
                                String[] args = getLastTwoStringArguments();
                                // pop current two args
                                mv.visitInsn(POP);
                                mv.visitInsn(POP);
                                ProxyTargetReplacement.targetClassAnnotation(mv, td.msign.getClassInfo(), args);
                                return;
                            }
                        }
                    }
                    super.visitMethodInsn(opcode, string, mname, mdesc, isInterface);
                }
            };
        }
    }, 0);
}

Example 3 with MethodVisitor

use of org.apache.xbean.asm6.MethodVisitor in project tomee by apache.

the class DynamicSubclass method generateBytes.

private static byte[] generateBytes(final Class<?> classToProxy) throws ProxyGenerationException {
    final Map<String, MethodVisitor> visitors = new HashMap<>();
    final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
    final String proxyClassFileName = getSubclassName(classToProxy).replace('.', '/');
    final String classFileName = classToProxy.getName().replace('.', '/');
    cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, proxyClassFileName, null, classFileName, null);
    cw.visitSource(classFileName + ".java", null);
    // push InvocationHandler field
    cw.visitField(ACC_FINAL + ACC_PRIVATE, "this$handler", "Ljava/lang/reflect/InvocationHandler;", null, null).visitEnd();
    for (final Constructor<?> constructor : classToProxy.getConstructors()) {
        if (!Modifier.isPublic(constructor.getModifiers())) {
            continue;
        }
        final MethodVisitor mv = visitConstructor(cw, proxyClassFileName, classFileName, constructor);
        visitors.put("<init>" + Type.getConstructorDescriptor(constructor), mv);
    }
    final Map<String, List<Method>> methodMap = new HashMap<>();
    getNonPrivateMethods(classToProxy, methodMap);
    // Iterate over the public methods
    for (final Map.Entry<String, List<Method>> entry : methodMap.entrySet()) {
        for (final Method method : entry.getValue()) {
            if (Modifier.isAbstract(method.getModifiers())) {
                final MethodVisitor visitor = LocalBeanProxyFactory.visit(cw, method, proxyClassFileName, "this$handler");
                visitors.put(method.getName() + Type.getMethodDescriptor(method), visitor);
            }
        }
    }
    copyClassAnnotations(classToProxy, cw);
    copyMethodAnnotations(classToProxy, visitors);
    // This should never be reached, but just in case
    for (final MethodVisitor visitor : visitors.values()) {
        visitor.visitEnd();
    }
    return cw.toByteArray();
}

Example 4 with MethodVisitor

use of org.apache.xbean.asm6.MethodVisitor in project component-runtime by Talend.

the class ProxyGenerator method createConstructor.

private String createConstructor(final ClassWriter cw, final Class<?> classToProxy, final String classFileName, final String proxyClassFileName, final Constructor<?> constructor, final boolean withInterceptors) {
    try {
        Constructor superDefaultCt;
        String parentClassFileName;
        String[] exceptions = null;
        if (classToProxy.isInterface()) {
            parentClassFileName = Type.getInternalName(Object.class);
            superDefaultCt = Object.class.getConstructor();
        } else {
            parentClassFileName = classFileName;
            if (constructor == null) {
                superDefaultCt = classToProxy.getConstructor();
            } else {
                superDefaultCt = constructor;
                Class<?>[] exceptionTypes = constructor.getExceptionTypes();
                exceptions = exceptionTypes.length == 0 ? null : new String[exceptionTypes.length];
                for (int i = 0; i < exceptionTypes.length; i++) {
                    exceptions[i] = Type.getInternalName(exceptionTypes[i]);
                }
            }
        }
        final String descriptor = Type.getConstructorDescriptor(superDefaultCt);
        final MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", descriptor, null, exceptions);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        if (constructor != null) {
            for (int i = 1; i <= constructor.getParameterTypes().length; i++) {
                mv.visitVarInsn(ALOAD, i);
            }
        }
        mv.visitMethodInsn(INVOKESPECIAL, parentClassFileName, "<init>", descriptor, false);
        if (withInterceptors) {
            mv.visitVarInsn(ALOAD, 0);
            mv.visitInsn(ACONST_NULL);
            mv.visitFieldInsn(PUTFIELD, proxyClassFileName, FIELD_INTERCEPTOR_HANDLER, Type.getDescriptor(InterceptorHandler.class));
        }
        mv.visitInsn(RETURN);
        mv.visitMaxs(-1, -1);
        mv.visitEnd();
        return parentClassFileName;
    } catch (final NoSuchMethodException e) {
        throw new IllegalStateException(e);
    }
}

Example 5 with MethodVisitor

use of org.apache.xbean.asm6.MethodVisitor in project component-runtime by Talend.

the class ProxyGenerator method delegateMethod.

private void delegateMethod(final ClassWriter cw, final Method method, final String proxyClassFileName, final int methodIndex) {
    final Class<?> returnType = method.getReturnType();
    final Class<?>[] parameterTypes = method.getParameterTypes();
    final Class<?>[] exceptionTypes = method.getExceptionTypes();
    final int modifiers = method.getModifiers();
    if (Modifier.isFinal(modifiers) || Modifier.isStatic(modifiers)) {
        throw new IllegalStateException("It's not possible to proxy a final or static method: " + method.getDeclaringClass().getName() + " " + method.getName());
    }
    // push the method definition
    int modifier = modifiers & (ACC_PUBLIC | ACC_PROTECTED | ACC_VARARGS);
    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(DUP);
        Class<?> parameterType = parameterTypes[i];
        // push number onto stack
        pushIntOntoStack(mv, i);
        if (parameterType.isPrimitive()) {
            String wrapperType = getWrapperType(parameterType);
            mv.visitFieldInsn(GETSTATIC, wrapperType, "TYPE", "Ljava/lang/Class;");
        } else {
            mv.visitLdcInsn(Type.getType(parameterType));
        }
        mv.visitInsn(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(ALOAD, 0);
    // get the invocationHandler field from this class
    mv.visitFieldInsn(GETFIELD, proxyClassFileName, FIELD_INTERCEPTOR_HANDLER, Type.getDescriptor(InterceptorHandler.class));
    // add the Method from the static array as first parameter
    mv.visitFieldInsn(GETSTATIC, proxyClassFileName, FIELD_INTERCEPTED_METHODS, Type.getDescriptor(Method[].class));
    // push the methodIndex of the current method
    if (methodIndex < 128) {
        mv.visitIntInsn(BIPUSH, methodIndex);
    } else if (methodIndex < 32267) {
        // for methods > 127 we need to push a short number as index
        mv.visitIntInsn(SIPUSH, methodIndex);
    } else {
        throw new IllegalStateException("Sorry, we only support Classes with 2^15 methods...");
    }
    // and now load the Method from the array
    mv.visitInsn(AALOAD);
    // prepare the parameter array as Object[] and store it on the stack
    pushMethodParameterArray(mv, parameterTypes);
    // invoke the invocationHandler
    mv.visitMethodInsn(INVOKEINTERFACE, Type.getInternalName(InterceptorHandler.class), "invoke", "(Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;", true);
    // 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), "()" + Type.getDescriptor(returnType), false);
    }
    // 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);
        Label l5 = new Label();
        mv.visitLabel(l5);
        for (int i = 0; i < exceptionTypes.length; i++) {
            Class<?> exceptionType = exceptionTypes[i];
            mv.visitLdcInsn(Type.getType("L" + exceptionType.getCanonicalName().replace('.', '/') + ";"));
            mv.visitVarInsn(ALOAD, length);
            mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "getCause", "()Ljava/lang/Throwable;", false);
            mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;", false);
            mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z", false);
            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;", false);
            mv.visitTypeInsn(CHECKCAST, getCastType(exceptionType));
            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", false);
                mv.visitInsn(ATHROW);
            }
        }
    }
    // finish this method
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}