Example usage for org.objectweb.asm MethodVisitor visitMaxs

List of usage examples for org.objectweb.asm MethodVisitor visitMaxs

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Introduction

In this page you can find the example usage for org.objectweb.asm MethodVisitor visitMaxs.

Prototype

public void visitMaxs(final int maxStack, final int maxLocals)

Source Link

Document

Visits the maximum stack size and the maximum number of local variables of the method.

Usage

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeUnionGenerator.java

License:Apache License

private void makeValuedConstructor(ClassWriter cw, Union.Value value) {
    MethodVisitor mv = cw.visitMethod(ACC_PROTECTED, "<init>", argsSignature(value.getMembers().size()) + "V",
            null, null);//from w  w w .j a  va  2 s  .c o  m
    mv.visitCode();
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, value.getUnion().getPackageAndClass().toJVMType(), "<init>", "()V",
            false);
    int idx = 1;
    for (String member : value.getMembers()) {
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ALOAD, idx++);
        mv.visitFieldInsn(PUTFIELD, value.getPackageAndClass().toJVMType(), member, "Ljava/lang/Object;");
    }
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}

From source file:fr.insalyon.citi.golo.runtime.adapters.JavaBytecodeAdapterGenerator.java

License:Apache License

private void makeFrontendOverrides(ClassWriter classWriter, AdapterDefinition adapterDefinition) {
    for (Method method : getAllVirtualMethods(adapterDefinition)) {
        int access = isPublic(method.getModifiers()) ? ACC_PUBLIC : ACC_PROTECTED;
        if (method.isVarArgs()) {
            access = access & ACC_VARARGS;
        }/*from  ww w  .j  a  va2 s . c  o  m*/
        String name = method.getName();
        String descriptor = Type.getMethodDescriptor(method);
        Class<?>[] exceptionTypes = method.getExceptionTypes();
        String[] exceptions = new String[exceptionTypes.length];
        for (int i = 0; i < exceptionTypes.length; i++) {
            exceptions[i] = Type.getInternalName(exceptionTypes[i]);
        }
        MethodVisitor methodVisitor = classWriter.visitMethod(access, name, descriptor, null, exceptions);
        methodVisitor.visitCode();
        Class<?>[] parameterTypes = method.getParameterTypes();
        Type[] indyTypes = new Type[parameterTypes.length + 1];
        indyTypes[0] = Type.getType(Object.class);
        methodVisitor.visitVarInsn(ALOAD, 0);
        int argIndex = 1;
        for (int i = 0; i < parameterTypes.length; i++) {
            argIndex = loadArgument(methodVisitor, parameterTypes[i], argIndex);
            indyTypes[i + 1] = Type.getType(parameterTypes[i]);
        }
        methodVisitor.visitInvokeDynamicInsn(method.getName(),
                Type.getMethodDescriptor(Type.getReturnType(method), indyTypes), ADAPTER_HANDLE);
        makeReturn(methodVisitor, method.getReturnType());
        methodVisitor.visitMaxs(0, 0);
        methodVisitor.visitEnd();
    }
}

From source file:fr.insalyon.citi.golo.runtime.adapters.JavaBytecodeAdapterGenerator.java

License:Apache License

private void makeConstructors(ClassWriter classWriter, AdapterDefinition adapterDefinition) {
    try {//from  ww  w .  ja v  a  2s.  co  m
        Class<?> parentClass = Class.forName(adapterDefinition.getParent(), true,
                adapterDefinition.getClassLoader());
        for (Constructor constructor : parentClass.getDeclaredConstructors()) {
            if (Modifier.isPublic(constructor.getModifiers())
                    || Modifier.isProtected(constructor.getModifiers())) {
                Class[] parameterTypes = constructor.getParameterTypes();
                Type[] adapterParameterTypes = new Type[parameterTypes.length + 1];
                adapterParameterTypes[0] = Type.getType(AdapterDefinition.class);
                for (int i = 1; i < adapterParameterTypes.length; i++) {
                    adapterParameterTypes[i] = Type.getType(parameterTypes[i - 1]);
                }
                String descriptor = Type.getMethodDescriptor(Type.VOID_TYPE, adapterParameterTypes);
                MethodVisitor methodVisitor = classWriter.visitMethod(ACC_PUBLIC, "<init>", descriptor, null,
                        null);
                methodVisitor.visitCode();
                methodVisitor.visitVarInsn(ALOAD, 0);
                methodVisitor.visitVarInsn(ALOAD, 1);
                methodVisitor.visitFieldInsn(PUTFIELD, jvmType(adapterDefinition.getName()), DEFINITION_FIELD,
                        "Lfr/insalyon/citi/golo/runtime/adapters/AdapterDefinition;");
                methodVisitor.visitVarInsn(ALOAD, 0);
                int argIndex = 2;
                for (Class parameterType : parameterTypes) {
                    argIndex = loadArgument(methodVisitor, parameterType, argIndex);
                }
                methodVisitor.visitMethodInsn(INVOKESPECIAL, Type.getInternalName(parentClass), "<init>",
                        Type.getConstructorDescriptor(constructor));
                methodVisitor.visitInsn(RETURN);
                methodVisitor.visitMaxs(0, 0);
                methodVisitor.visitEnd();
            }
        }
    } catch (ClassNotFoundException e) {
        throw new RuntimeException(e);
    }
}

From source file:fr.liglab.adele.cilia.dependency.ProxyGenerator.java

License:Apache License

/**
 * Generates a delegated method./*from  w  ww. j  a  v  a2 s . co m*/
 *
 * @param cw        the class writer
 * @param method    the method object to delegate
 * @param className the generated class name
 * @param itfName   the internal specification class name
 */
private static void generateDelegator(ClassWriter cw, Method method, String className, String itfName) {
    String methodName = method.getName();
    String desc = Type.getMethodDescriptor(method);
    String[] exceptions = getInternalClassNames(method.getExceptionTypes());
    int modifiers = method.getModifiers() & ~(Modifier.ABSTRACT | Modifier.NATIVE | Modifier.SYNCHRONIZED);
    Type[] types = Type.getArgumentTypes(method);

    int freeRoom = 1;
    for (int t = 0; t < types.length; t++) {
        freeRoom = freeRoom + types[t].getSize();
    }

    MethodVisitor mv = cw.visitMethod(modifiers, methodName, desc, null, exceptions);
    mv.visitCode();

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, DEPENDENCY, DEPENDENCY_DESC); // The dependency is on the stack.
    mv.visitMethodInsn(INVOKEVIRTUAL, DEPENDENCY_INTERNAL_NAME, "getService", // Call getService
            "()Ljava/lang/Object;"); // The service object is on the stack.
    int varSvc = freeRoom;
    freeRoom = freeRoom + 1; // Object Reference.
    mv.visitVarInsn(ASTORE, varSvc); // Store the service object.

    Label notNull = new Label();
    Label isNull = new Label();
    mv.visitVarInsn(ALOAD, varSvc); // Load the service
    mv.visitJumpInsn(IFNONNULL, notNull); // If not null go to not null
    // Null branch - throw the exception
    mv.visitLabel(isNull);
    mv.visitTypeInsn(NEW, "java/lang/RuntimeException");
    mv.visitInsn(DUP);
    mv.visitLdcInsn("No service available");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V");
    mv.visitInsn(ATHROW);
    // End of the null branch

    // Not null, go one the execution
    mv.visitLabel(notNull);

    // Invoke the method on the service object.
    mv.visitVarInsn(ALOAD, varSvc);
    // Push argument on the stack.
    int i = 1; // Arguments. (non static method)
    for (int t = 0; t < types.length; t++) {
        mv.visitVarInsn(types[t].getOpcode(ILOAD), i);
        i = i + types[t].getSize();
    }
    // Invocation
    mv.visitMethodInsn(INVOKEINTERFACE, itfName, methodName, desc);

    // Return the result
    Type returnType = Type.getReturnType(desc);
    if (returnType.getSort() != Type.VOID) {
        mv.visitInsn(returnType.getOpcode(IRETURN));
    } else {
        mv.visitInsn(RETURN);
    }

    // End of the method.
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}

From source file:fr.liglab.adele.cilia.dependency.ProxyGenerator.java

License:Apache License

/**
 * Generates the constructors. The constructor receives a dependency
 * and set the {@link ProxyGenerator#DEPENDENCY} field.
 *
 * @param cw        the class writer/*from  w ww.  j a  va  2  s . c om*/
 * @param className the generated class name.
 */
private static void generateConstructor(ClassWriter cw, String className, String parent) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", '(' + DEPENDENCY_DESC + ")V", null, null);
    mv.visitCode();

    mv.visitVarInsn(ALOAD, 0); // Load this
    mv.visitInsn(DUP); // Dup
    mv.visitMethodInsn(INVOKESPECIAL, parent, "<init>", "()V"); // Call  super
    mv.visitVarInsn(ALOAD, 1); // Load the argument
    mv.visitFieldInsn(PUTFIELD, className, DEPENDENCY, DEPENDENCY_DESC); // Assign the dependency field
    mv.visitInsn(RETURN); // Return void

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

From source file:global.namespace.neuron.di.internal.ProxyClassVisitor.java

License:Apache License

private void insertConstructor() {
    final MethodVisitor mv = cv.visitMethod(ACC_PRIVATE_SYNTHETIC, CONSTRUCTOR_NAME,
            ACCEPTS_NOTHING_AND_RETURNS_VOID_DESC, null, null);
    mv.visitCode();//from w  w w  .j a v  a  2 s  . c o  m
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, superName, CONSTRUCTOR_NAME, ACCEPTS_NOTHING_AND_RETURNS_VOID_DESC,
            false);
    for (final Method method : bindableMethods) {
        if (0 == (method.getModifiers() & ACC_ABSTRACT)) {
            final Class<?> declaringClass = method.getDeclaringClass();
            final boolean isInterface = declaringClass.isInterface();
            final String owner = getInternalName(declaringClass);
            final String name = method.getName();
            final String desc = getMethodDescriptor(method);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitInvokeDynamicInsn("get", "(" + proxyDesc + ")" + dependencyProviderDesc, metaFactoryHandle,
                    acceptsNothingAndReturnsObjectType,
                    new Handle(H_INVOKESPECIAL, owner, name, desc, isInterface),
                    acceptsNothingAndReturnsObjectType);
            mv.visitFieldInsn(PUTFIELD, proxyName, name + PROVIDER, dependencyProviderDesc);
        }
    }
    mv.visitInsn(RETURN);
    mv.visitMaxs(-1, -1);
    mv.visitEnd();
}

From source file:global.namespace.neuron.di.internal.ProxyClassVisitor.java

License:Apache License

private void insertMethods() {
    for (final Method method : bindableMethods) {
        new Object() {

            final int access = method.getModifiers() & ~ACC_ABSTRACT_NATIVE | ACC_SYNTHETIC;
            final String name = method.getName();
            final String desc = getMethodDescriptor(method);

            final Class<?> returnType = method.getReturnType();
            final String returnTypeName = getInternalName(returnType);
            final String returnTypeDesc = getDescriptor(returnType);

            final Class<?> boxedReturnType = boxed(returnType);
            final String boxedReturnTypeName = getInternalName(boxedReturnType);
            final String boxedReturnTypeDesc = getDescriptor(boxedReturnType);

            final int returnOpCode = returnOpCode(method);

            {/*from ww w.j  a  v  a  2s .c om*/
                generateProxyField();
                generateProxyCallMethod();
            }

            void generateProxyField() {
                cv.visitField(ACC_PRIVATE_SYNTHETIC, name + PROVIDER, dependencyProviderDesc, null, null)
                        .visitEnd();
            }

            void generateProxyCallMethod() {
                final MethodVisitor mv = beginMethod(name);
                mv.visitFieldInsn(GETFIELD, proxyName, name + PROVIDER, dependencyProviderDesc);
                mv.visitMethodInsn(INVOKEINTERFACE, dependencyProviderName, "get",
                        ACCEPTS_NOTHING_AND_RETURNS_OBJECT_DESC, true);
                if (!boxedReturnType.isAssignableFrom(Object.class)) {
                    mv.visitTypeInsn(CHECKCAST,
                            boxedReturnType.isArray() ? boxedReturnTypeDesc : boxedReturnTypeName);
                }
                if (boxedReturnType != returnType) {
                    assert !returnType.isArray();
                    mv.visitMethodInsn(INVOKEVIRTUAL, boxedReturnTypeName, returnTypeName.concat("Value"),
                            "()".concat(returnTypeDesc), false);
                }
                endMethod(mv);
            }

            MethodVisitor beginMethod(final String name) {
                final MethodVisitor mv = cv.visitMethod(access, name, desc, null, null);
                mv.visitCode();
                mv.visitVarInsn(ALOAD, 0);
                return mv;
            }

            void endMethod(final MethodVisitor mv) {
                mv.visitInsn(returnOpCode);
                mv.visitMaxs(-1, -1);
                mv.visitEnd();
            }
        };
    }
}

From source file:gnu.classpath.tools.rmic.ClassRmicCompiler.java

License:Open Source License

private static void generateClassForNamer(ClassVisitor cls) {
    MethodVisitor cv = cls.visitMethod(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC + Opcodes.ACC_SYNTHETIC,
            forName,/*from  w  w  w .ja v a 2  s.  c om*/
            Type.getMethodDescriptor(Type.getType(Class.class), new Type[] { Type.getType(String.class) }),
            null, null);

    Label start = new Label();
    cv.visitLabel(start);
    cv.visitVarInsn(Opcodes.ALOAD, 0);
    cv.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(Class.class), "forName",
            Type.getMethodDescriptor(Type.getType(Class.class), new Type[] { Type.getType(String.class) }));
    cv.visitInsn(Opcodes.ARETURN);

    Label handler = new Label();
    cv.visitLabel(handler);
    cv.visitVarInsn(Opcodes.ASTORE, 1);
    cv.visitTypeInsn(Opcodes.NEW, typeArg(NoClassDefFoundError.class));
    cv.visitInsn(Opcodes.DUP);
    cv.visitVarInsn(Opcodes.ALOAD, 1);
    cv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(ClassNotFoundException.class), "getMessage",
            Type.getMethodDescriptor(Type.getType(String.class), new Type[] {}));
    cv.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(NoClassDefFoundError.class), "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(String.class) }));
    cv.visitInsn(Opcodes.ATHROW);
    cv.visitTryCatchBlock(start, handler, handler, Type.getInternalName(ClassNotFoundException.class));
    cv.visitMaxs(-1, -1);
}

From source file:gnu.classpath.tools.rmic.ClassRmicCompiler.java

License:Open Source License

private void generateStub() throws IOException {
    stubname = fullclassname + "_Stub";
    String stubclassname = classname + "_Stub";
    File file = new File((destination == null ? "." : destination) + File.separator
            + stubname.replace('.', File.separatorChar) + ".class");

    if (verbose)//from w  w  w.j  ava 2 s .  com
        System.out.println("[Generating class " + stubname + "]");

    final ClassWriter stub = new ClassWriter(true);
    classInternalName = stubname.replace('.', '/');
    final String superInternalName = Type.getType(RemoteStub.class).getInternalName();

    String[] remoteInternalNames = internalNameArray((Class[]) mRemoteInterfaces.toArray(new Class[] {}));
    stub.visit(Opcodes.V1_2, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL, classInternalName, null, superInternalName,
            remoteInternalNames);

    if (need12Stubs) {
        stub.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC + Opcodes.ACC_FINAL, "serialVersionUID",
                Type.LONG_TYPE.getDescriptor(), null, new Long(2L));
    }

    if (need11Stubs) {
        stub.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC + Opcodes.ACC_FINAL, "interfaceHash",
                Type.LONG_TYPE.getDescriptor(), null, new Long(RMIHashes.getInterfaceHash(clazz)));

        if (need12Stubs) {
            stub.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC, "useNewInvoke",
                    Type.BOOLEAN_TYPE.getDescriptor(), null, null);
        }

        stub.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC + Opcodes.ACC_FINAL, "operations",
                Type.getDescriptor(Operation[].class), null, null);
    }

    // Set of method references.
    if (need12Stubs) {
        for (int i = 0; i < remotemethods.length; i++) {
            Method m = remotemethods[i].meth;
            String slotName = "$method_" + m.getName() + "_" + i;
            stub.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC, slotName,
                    Type.getDescriptor(Method.class), null, null);
        }
    }

    MethodVisitor clinit = stub.visitMethod(Opcodes.ACC_STATIC, "<clinit>",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {}), null, null);

    if (need11Stubs) {
        fillOperationArray(clinit);
        if (!need12Stubs)
            clinit.visitInsn(Opcodes.RETURN);
    }

    if (need12Stubs) {
        // begin of try
        Label begin = new Label();

        // beginning of catch
        Label handler = new Label();
        clinit.visitLabel(begin);

        // Initialize the methods references.
        if (need11Stubs) {
            /*
             * RemoteRef.class.getMethod("invoke", new Class[] {
             *   Remote.class, Method.class, Object[].class, long.class })
             */
            generateClassConstant(clinit, RemoteRef.class);
            clinit.visitLdcInsn("invoke");
            generateClassArray(clinit, new Class[] { Remote.class, Method.class, Object[].class, long.class });
            clinit.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(Class.class), "getMethod",
                    Type.getMethodDescriptor(Type.getType(Method.class),
                            new Type[] { Type.getType(String.class), Type.getType(Class[].class) }));

            // useNewInvoke = true
            clinit.visitInsn(Opcodes.ICONST_1);
            clinit.visitFieldInsn(Opcodes.PUTSTATIC, classInternalName, "useNewInvoke",
                    Type.BOOLEAN_TYPE.getDescriptor());
        }

        generateStaticMethodObjs(clinit);

        // jump past handler
        clinit.visitInsn(Opcodes.RETURN);
        clinit.visitLabel(handler);
        if (need11Stubs) {
            // useNewInvoke = false
            clinit.visitInsn(Opcodes.ICONST_0);
            clinit.visitFieldInsn(Opcodes.PUTSTATIC, classInternalName, "useNewInvoke",
                    Type.BOOLEAN_TYPE.getDescriptor());
            clinit.visitInsn(Opcodes.RETURN);
        } else {
            // throw NoSuchMethodError
            clinit.visitTypeInsn(Opcodes.NEW, typeArg(NoSuchMethodError.class));
            clinit.visitInsn(Opcodes.DUP);
            clinit.visitLdcInsn("stub class initialization failed");
            clinit.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(NoSuchMethodError.class),
                    "<init>",
                    Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(String.class) }));
            clinit.visitInsn(Opcodes.ATHROW);
        }

        clinit.visitTryCatchBlock(begin, handler, handler, Type.getInternalName(NoSuchMethodException.class));

    }

    clinit.visitMaxs(-1, -1);

    generateClassForNamer(stub);

    // Constructors
    if (need11Stubs) {
        // no arg public constructor
        MethodVisitor code = stub.visitMethod(Opcodes.ACC_PUBLIC, "<init>",
                Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {}), null, null);
        code.visitVarInsn(Opcodes.ALOAD, 0);
        code.visitMethodInsn(Opcodes.INVOKESPECIAL, superInternalName, "<init>",
                Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {}));
        code.visitInsn(Opcodes.RETURN);

        code.visitMaxs(-1, -1);
    }

    // public RemoteRef constructor
    MethodVisitor constructor = stub.visitMethod(Opcodes.ACC_PUBLIC, "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(RemoteRef.class) }), null, null);
    constructor.visitVarInsn(Opcodes.ALOAD, 0);
    constructor.visitVarInsn(Opcodes.ALOAD, 1);
    constructor.visitMethodInsn(Opcodes.INVOKESPECIAL, superInternalName, "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(RemoteRef.class) }));
    constructor.visitInsn(Opcodes.RETURN);
    constructor.visitMaxs(-1, -1);

    // Method implementations
    for (int i = 0; i < remotemethods.length; i++) {
        Method m = remotemethods[i].meth;
        Class[] sig = m.getParameterTypes();
        Class returntype = m.getReturnType();
        Class[] except = sortExceptions((Class[]) remotemethods[i].exceptions.toArray(new Class[0]));

        MethodVisitor code = stub.visitMethod(Opcodes.ACC_PUBLIC, m.getName(),
                Type.getMethodDescriptor(Type.getType(returntype), typeArray(sig)), null,
                internalNameArray(typeArray(except)));

        final Variables var = new Variables();

        // this and parameters are the declared vars
        var.declare("this");
        for (int j = 0; j < sig.length; j++)
            var.declare(param(m, j), size(sig[j]));

        Label methodTryBegin = new Label();
        code.visitLabel(methodTryBegin);

        if (need12Stubs) {
            Label oldInvoke = new Label();
            if (need11Stubs) {
                // if not useNewInvoke jump to old invoke
                code.visitFieldInsn(Opcodes.GETSTATIC, classInternalName, "useNewInvoke",
                        Type.getDescriptor(boolean.class));
                code.visitJumpInsn(Opcodes.IFEQ, oldInvoke);
            }

            // this.ref
            code.visitVarInsn(Opcodes.ALOAD, var.get("this"));
            code.visitFieldInsn(Opcodes.GETFIELD, Type.getInternalName(RemoteObject.class), "ref",
                    Type.getDescriptor(RemoteRef.class));

            // "this" is first arg to invoke
            code.visitVarInsn(Opcodes.ALOAD, var.get("this"));

            // method object is second arg to invoke
            String methName = "$method_" + m.getName() + "_" + i;
            code.visitFieldInsn(Opcodes.GETSTATIC, classInternalName, methName,
                    Type.getDescriptor(Method.class));

            // args to remote method are third arg to invoke
            if (sig.length == 0)
                code.visitInsn(Opcodes.ACONST_NULL);
            else {
                // create arg Object[] (with boxed primitives) and push it
                code.visitLdcInsn(new Integer(sig.length));
                code.visitTypeInsn(Opcodes.ANEWARRAY, typeArg(Object.class));

                var.allocate("argArray");
                code.visitVarInsn(Opcodes.ASTORE, var.get("argArray"));

                for (int j = 0; j < sig.length; j++) {
                    int size = size(sig[j]);
                    int insn = loadOpcode(sig[j]);
                    Class box = sig[j].isPrimitive() ? box(sig[j]) : null;

                    code.visitVarInsn(Opcodes.ALOAD, var.get("argArray"));
                    code.visitLdcInsn(new Integer(j));

                    // put argument on stack
                    if (box != null) {
                        code.visitTypeInsn(Opcodes.NEW, typeArg(box));
                        code.visitInsn(Opcodes.DUP);
                        code.visitVarInsn(insn, var.get(param(m, j)));
                        code.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(box), "<init>",
                                Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(sig[j]) }));
                    } else
                        code.visitVarInsn(insn, var.get(param(m, j)));

                    code.visitInsn(Opcodes.AASTORE);
                }

                code.visitVarInsn(Opcodes.ALOAD, var.deallocate("argArray"));
            }

            // push remote operation opcode
            code.visitLdcInsn(new Long(remotemethods[i].hash));
            code.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(RemoteRef.class), "invoke",
                    Type.getMethodDescriptor(Type.getType(Object.class),
                            new Type[] { Type.getType(Remote.class), Type.getType(Method.class),
                                    Type.getType(Object[].class), Type.LONG_TYPE }));

            if (!returntype.equals(Void.TYPE)) {
                int retcode = returnOpcode(returntype);
                Class boxCls = returntype.isPrimitive() ? box(returntype) : null;
                code.visitTypeInsn(Opcodes.CHECKCAST, typeArg(boxCls == null ? returntype : boxCls));
                if (returntype.isPrimitive()) {
                    // unbox
                    code.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getType(boxCls).getInternalName(),
                            unboxMethod(returntype),
                            Type.getMethodDescriptor(Type.getType(returntype), new Type[] {}));
                }

                code.visitInsn(retcode);
            } else
                code.visitInsn(Opcodes.RETURN);

            if (need11Stubs)
                code.visitLabel(oldInvoke);
        }

        if (need11Stubs) {

            // this.ref.newCall(this, operations, index, interfaceHash)
            code.visitVarInsn(Opcodes.ALOAD, var.get("this"));
            code.visitFieldInsn(Opcodes.GETFIELD, Type.getInternalName(RemoteObject.class), "ref",
                    Type.getDescriptor(RemoteRef.class));

            // "this" is first arg to newCall
            code.visitVarInsn(Opcodes.ALOAD, var.get("this"));

            // operations is second arg to newCall
            code.visitFieldInsn(Opcodes.GETSTATIC, classInternalName, "operations",
                    Type.getDescriptor(Operation[].class));

            // method index is third arg
            code.visitLdcInsn(new Integer(i));

            // interface hash is fourth arg
            code.visitFieldInsn(Opcodes.GETSTATIC, classInternalName, "interfaceHash",
                    Type.LONG_TYPE.getDescriptor());

            code.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(RemoteRef.class), "newCall",
                    Type.getMethodDescriptor(Type.getType(RemoteCall.class),
                            new Type[] { Type.getType(RemoteObject.class), Type.getType(Operation[].class),
                                    Type.INT_TYPE, Type.LONG_TYPE }));

            // store call object on stack and leave copy on stack
            var.allocate("call");
            code.visitInsn(Opcodes.DUP);
            code.visitVarInsn(Opcodes.ASTORE, var.get("call"));

            Label beginArgumentTryBlock = new Label();
            code.visitLabel(beginArgumentTryBlock);

            // ObjectOutput out = call.getOutputStream();
            code.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(RemoteCall.class),
                    "getOutputStream",
                    Type.getMethodDescriptor(Type.getType(ObjectOutput.class), new Type[] {}));

            for (int j = 0; j < sig.length; j++) {
                // dup the ObjectOutput
                code.visitInsn(Opcodes.DUP);

                // get j'th arg to remote method
                code.visitVarInsn(loadOpcode(sig[j]), var.get(param(m, j)));

                Class argCls = sig[j].isPrimitive() ? sig[j] : Object.class;

                // out.writeFoo
                code.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(ObjectOutput.class),
                        writeMethod(sig[j]),
                        Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(argCls) }));
            }

            // pop ObjectOutput
            code.visitInsn(Opcodes.POP);

            Label iohandler = new Label();
            Label endArgumentTryBlock = new Label();
            code.visitJumpInsn(Opcodes.GOTO, endArgumentTryBlock);
            code.visitLabel(iohandler);

            // throw new MarshalException(msg, ioexception);
            code.visitVarInsn(Opcodes.ASTORE, var.allocate("exception"));
            code.visitTypeInsn(Opcodes.NEW, typeArg(MarshalException.class));
            code.visitInsn(Opcodes.DUP);
            code.visitLdcInsn("error marshalling arguments");
            code.visitVarInsn(Opcodes.ALOAD, var.deallocate("exception"));
            code.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(MarshalException.class), "<init>",
                    Type.getMethodDescriptor(Type.VOID_TYPE,
                            new Type[] { Type.getType(String.class), Type.getType(Exception.class) }));
            code.visitInsn(Opcodes.ATHROW);

            code.visitLabel(endArgumentTryBlock);
            code.visitTryCatchBlock(beginArgumentTryBlock, iohandler, iohandler,
                    Type.getInternalName(IOException.class));

            // this.ref.invoke(call)
            code.visitVarInsn(Opcodes.ALOAD, var.get("this"));
            code.visitFieldInsn(Opcodes.GETFIELD, Type.getInternalName(RemoteObject.class), "ref",
                    Type.getDescriptor(RemoteRef.class));
            code.visitVarInsn(Opcodes.ALOAD, var.get("call"));
            code.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(RemoteRef.class), "invoke",
                    Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(RemoteCall.class) }));

            // handle return value
            boolean needcastcheck = false;

            Label beginReturnTryCatch = new Label();
            code.visitLabel(beginReturnTryCatch);

            int returncode = returnOpcode(returntype);

            if (!returntype.equals(Void.TYPE)) {
                // call.getInputStream()
                code.visitVarInsn(Opcodes.ALOAD, var.get("call"));
                code.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(RemoteCall.class),
                        "getInputStream",
                        Type.getMethodDescriptor(Type.getType(ObjectInput.class), new Type[] {}));

                Class readCls = returntype.isPrimitive() ? returntype : Object.class;
                code.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(ObjectInput.class),
                        readMethod(returntype), Type.getMethodDescriptor(Type.getType(readCls), new Type[] {}));

                boolean castresult = false;

                if (!returntype.isPrimitive()) {
                    if (!returntype.equals(Object.class))
                        castresult = true;
                    else
                        needcastcheck = true;
                }

                if (castresult)
                    code.visitTypeInsn(Opcodes.CHECKCAST, typeArg(returntype));

                // leave result on stack for return
            }

            // this.ref.done(call)
            code.visitVarInsn(Opcodes.ALOAD, var.get("this"));
            code.visitFieldInsn(Opcodes.GETFIELD, Type.getInternalName(RemoteObject.class), "ref",
                    Type.getDescriptor(RemoteRef.class));
            code.visitVarInsn(Opcodes.ALOAD, var.deallocate("call"));
            code.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(RemoteRef.class), "done",
                    Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(RemoteCall.class) }));

            // return; or return result;
            code.visitInsn(returncode);

            // exception handler
            Label handler = new Label();
            code.visitLabel(handler);
            code.visitVarInsn(Opcodes.ASTORE, var.allocate("exception"));

            // throw new UnmarshalException(msg, e)
            code.visitTypeInsn(Opcodes.NEW, typeArg(UnmarshalException.class));
            code.visitInsn(Opcodes.DUP);
            code.visitLdcInsn("error unmarshalling return");
            code.visitVarInsn(Opcodes.ALOAD, var.deallocate("exception"));
            code.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(UnmarshalException.class),
                    "<init>", Type.getMethodDescriptor(Type.VOID_TYPE,
                            new Type[] { Type.getType(String.class), Type.getType(Exception.class) }));
            code.visitInsn(Opcodes.ATHROW);

            Label endReturnTryCatch = new Label();

            // catch IOException
            code.visitTryCatchBlock(beginReturnTryCatch, handler, handler,
                    Type.getInternalName(IOException.class));

            if (needcastcheck) {
                // catch ClassNotFoundException
                code.visitTryCatchBlock(beginReturnTryCatch, handler, handler,
                        Type.getInternalName(ClassNotFoundException.class));
            }
        }

        Label rethrowHandler = new Label();
        code.visitLabel(rethrowHandler);
        // rethrow declared exceptions
        code.visitInsn(Opcodes.ATHROW);

        boolean needgeneral = true;
        for (int j = 0; j < except.length; j++) {
            if (except[j] == Exception.class)
                needgeneral = false;
        }

        for (int j = 0; j < except.length; j++) {
            code.visitTryCatchBlock(methodTryBegin, rethrowHandler, rethrowHandler,
                    Type.getInternalName(except[j]));
        }

        if (needgeneral) {
            // rethrow unchecked exceptions
            code.visitTryCatchBlock(methodTryBegin, rethrowHandler, rethrowHandler,
                    Type.getInternalName(RuntimeException.class));

            Label generalHandler = new Label();
            code.visitLabel(generalHandler);
            String msg = "undeclared checked exception";

            // throw new java.rmi.UnexpectedException(msg, e)
            code.visitVarInsn(Opcodes.ASTORE, var.allocate("exception"));
            code.visitTypeInsn(Opcodes.NEW, typeArg(UnexpectedException.class));
            code.visitInsn(Opcodes.DUP);
            code.visitLdcInsn(msg);
            code.visitVarInsn(Opcodes.ALOAD, var.deallocate("exception"));
            code.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(UnexpectedException.class),
                    "<init>", Type.getMethodDescriptor(Type.VOID_TYPE,
                            new Type[] { Type.getType(String.class), Type.getType(Exception.class) }));
            code.visitInsn(Opcodes.ATHROW);

            code.visitTryCatchBlock(methodTryBegin, rethrowHandler, generalHandler,
                    Type.getInternalName(Exception.class));
        }

        code.visitMaxs(-1, -1);
    }

    stub.visitEnd();
    byte[] classData = stub.toByteArray();
    if (!noWrite) {
        if (file.exists())
            file.delete();
        if (file.getParentFile() != null)
            file.getParentFile().mkdirs();
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(classData);
        fos.flush();
        fos.close();
    }
}

From source file:gnu.classpath.tools.rmic.ClassRmicCompiler.java

License:Open Source License

private void generateSkel() throws IOException {
    skelname = fullclassname + "_Skel";
    String skelclassname = classname + "_Skel";
    File file = new File(destination == null ? ""
            : destination + File.separator + skelname.replace('.', File.separatorChar) + ".class");
    if (verbose)//  w  w w .  ja v  a  2s .c om
        System.out.println("[Generating class " + skelname + "]");

    final ClassWriter skel = new ClassWriter(true);
    classInternalName = skelname.replace('.', '/');
    skel.visit(Opcodes.V1_1, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL, classInternalName,
            Type.getInternalName(Object.class), null,
            new String[] { Type.getType(Skeleton.class).getInternalName() });

    skel.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC + Opcodes.ACC_FINAL, "interfaceHash",
            Type.LONG_TYPE.getDescriptor(), null, new Long(RMIHashes.getInterfaceHash(clazz)));

    skel.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC + Opcodes.ACC_FINAL, "operations",
            Type.getDescriptor(Operation[].class), null, null);

    MethodVisitor clinit = skel.visitMethod(Opcodes.ACC_STATIC, "<clinit>",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {}), null, null);

    fillOperationArray(clinit);
    clinit.visitInsn(Opcodes.RETURN);

    clinit.visitMaxs(-1, -1);

    // no arg public constructor
    MethodVisitor init = skel.visitMethod(Opcodes.ACC_PUBLIC, "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {}), null, null);
    init.visitVarInsn(Opcodes.ALOAD, 0);
    init.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(Object.class), "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {}));
    init.visitInsn(Opcodes.RETURN);
    init.visitMaxs(-1, -1);

    /*
     * public Operation[] getOperations()
     * returns a clone of the operations array
     */
    MethodVisitor getOp = skel.visitMethod(Opcodes.ACC_PUBLIC, "getOperations",
            Type.getMethodDescriptor(Type.getType(Operation[].class), new Type[] {}), null, null);
    getOp.visitFieldInsn(Opcodes.GETSTATIC, classInternalName, "operations",
            Type.getDescriptor(Operation[].class));
    getOp.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(Object.class), "clone",
            Type.getMethodDescriptor(Type.getType(Object.class), new Type[] {}));
    getOp.visitTypeInsn(Opcodes.CHECKCAST, typeArg(Operation[].class));
    getOp.visitInsn(Opcodes.ARETURN);
    getOp.visitMaxs(-1, -1);

    // public void dispatch(Remote, RemoteCall, int opnum, long hash)
    MethodVisitor dispatch = skel.visitMethod(Opcodes.ACC_PUBLIC, "dispatch",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(Remote.class),
                    Type.getType(RemoteCall.class), Type.INT_TYPE, Type.LONG_TYPE }),
            null, new String[] { Type.getInternalName(Exception.class) });

    Variables var = new Variables();
    var.declare("this");
    var.declare("remoteobj");
    var.declare("remotecall");
    var.declare("opnum");
    var.declareWide("hash");

    /*
     * if opnum >= 0
     * XXX it is unclear why there is handling of negative opnums
     */
    dispatch.visitVarInsn(Opcodes.ILOAD, var.get("opnum"));
    Label nonNegativeOpnum = new Label();
    Label opnumSet = new Label();
    dispatch.visitJumpInsn(Opcodes.IFGE, nonNegativeOpnum);

    for (int i = 0; i < remotemethods.length; i++) {
        // assign opnum if hash matches supplied hash
        dispatch.visitVarInsn(Opcodes.LLOAD, var.get("hash"));
        dispatch.visitLdcInsn(new Long(remotemethods[i].hash));
        Label notIt = new Label();
        dispatch.visitInsn(Opcodes.LCMP);
        dispatch.visitJumpInsn(Opcodes.IFNE, notIt);

        // opnum = <opnum>
        dispatch.visitLdcInsn(new Integer(i));
        dispatch.visitVarInsn(Opcodes.ISTORE, var.get("opnum"));
        dispatch.visitJumpInsn(Opcodes.GOTO, opnumSet);
        dispatch.visitLabel(notIt);
    }

    // throw new SkeletonMismatchException
    Label mismatch = new Label();
    dispatch.visitJumpInsn(Opcodes.GOTO, mismatch);

    dispatch.visitLabel(nonNegativeOpnum);

    // if opnum is already set, check that the hash matches the interface
    dispatch.visitVarInsn(Opcodes.LLOAD, var.get("hash"));
    dispatch.visitFieldInsn(Opcodes.GETSTATIC, classInternalName, "interfaceHash",
            Type.LONG_TYPE.getDescriptor());
    dispatch.visitInsn(Opcodes.LCMP);
    dispatch.visitJumpInsn(Opcodes.IFEQ, opnumSet);

    dispatch.visitLabel(mismatch);
    dispatch.visitTypeInsn(Opcodes.NEW, typeArg(SkeletonMismatchException.class));
    dispatch.visitInsn(Opcodes.DUP);
    dispatch.visitLdcInsn("interface hash mismatch");
    dispatch.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(SkeletonMismatchException.class),
            "<init>", Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(String.class) }));
    dispatch.visitInsn(Opcodes.ATHROW);

    // opnum has been set
    dispatch.visitLabel(opnumSet);

    dispatch.visitVarInsn(Opcodes.ALOAD, var.get("remoteobj"));
    dispatch.visitTypeInsn(Opcodes.CHECKCAST, typeArg(clazz));
    dispatch.visitVarInsn(Opcodes.ASTORE, var.get("remoteobj"));

    Label deflt = new Label();
    Label[] methLabels = new Label[remotemethods.length];
    for (int i = 0; i < methLabels.length; i++)
        methLabels[i] = new Label();

    // switch on opnum
    dispatch.visitVarInsn(Opcodes.ILOAD, var.get("opnum"));
    dispatch.visitTableSwitchInsn(0, remotemethods.length - 1, deflt, methLabels);

    // Method dispatch
    for (int i = 0; i < remotemethods.length; i++) {
        dispatch.visitLabel(methLabels[i]);
        Method m = remotemethods[i].meth;
        generateMethodSkel(dispatch, m, var);
    }

    dispatch.visitLabel(deflt);
    dispatch.visitTypeInsn(Opcodes.NEW, typeArg(UnmarshalException.class));
    dispatch.visitInsn(Opcodes.DUP);
    dispatch.visitLdcInsn("invalid method number");
    dispatch.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(UnmarshalException.class), "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(String.class) }));
    dispatch.visitInsn(Opcodes.ATHROW);

    dispatch.visitMaxs(-1, -1);

    skel.visitEnd();
    byte[] classData = skel.toByteArray();
    if (!noWrite) {
        if (file.exists())
            file.delete();
        if (file.getParentFile() != null)
            file.getParentFile().mkdirs();
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(classData);
        fos.flush();
        fos.close();
    }
}