Example usage for org.objectweb.asm Opcodes RETURN

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int RETURN

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Usage

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 a v a2  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)/*from w ww  . j av  a2  s  . c  o m*/
        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();
    }
}

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

License:Open Source License

private void generateMethodSkel(MethodVisitor cv, Method m, Variables var) {
    Class[] sig = m.getParameterTypes();

    Label readArgs = new Label();
    cv.visitLabel(readArgs);//  w  w w.  jav  a2  s  .  co  m

    boolean needcastcheck = false;

    // ObjectInput in = call.getInputStream();
    cv.visitVarInsn(Opcodes.ALOAD, var.get("remotecall"));
    cv.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(RemoteCall.class), "getInputStream",
            Type.getMethodDescriptor(Type.getType(ObjectInput.class), new Type[] {}));
    cv.visitVarInsn(Opcodes.ASTORE, var.allocate("objectinput"));

    for (int i = 0; i < sig.length; i++) {
        // dup input stream
        cv.visitVarInsn(Opcodes.ALOAD, var.get("objectinput"));

        Class readCls = sig[i].isPrimitive() ? sig[i] : Object.class;

        // in.readFoo()
        cv.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(ObjectInput.class), readMethod(sig[i]),
                Type.getMethodDescriptor(Type.getType(readCls), new Type[] {}));

        if (!sig[i].isPrimitive() && !sig[i].equals(Object.class)) {
            needcastcheck = true;
            cv.visitTypeInsn(Opcodes.CHECKCAST, typeArg(sig[i]));
        }

        // store arg in variable
        cv.visitVarInsn(storeOpcode(sig[i]), var.allocate(param(m, i), size(sig[i])));
    }

    var.deallocate("objectinput");

    Label doCall = new Label();
    Label closeInput = new Label();

    cv.visitJumpInsn(Opcodes.JSR, closeInput);
    cv.visitJumpInsn(Opcodes.GOTO, doCall);

    // throw new UnmarshalException
    Label handler = new Label();
    cv.visitLabel(handler);
    cv.visitVarInsn(Opcodes.ASTORE, var.allocate("exception"));
    cv.visitTypeInsn(Opcodes.NEW, typeArg(UnmarshalException.class));
    cv.visitInsn(Opcodes.DUP);
    cv.visitLdcInsn("error unmarshalling arguments");
    cv.visitVarInsn(Opcodes.ALOAD, var.deallocate("exception"));
    cv.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(UnmarshalException.class), "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE,
                    new Type[] { Type.getType(String.class), Type.getType(Exception.class) }));
    cv.visitVarInsn(Opcodes.ASTORE, var.allocate("toThrow"));
    cv.visitJumpInsn(Opcodes.JSR, closeInput);
    cv.visitVarInsn(Opcodes.ALOAD, var.get("toThrow"));
    cv.visitInsn(Opcodes.ATHROW);

    cv.visitTryCatchBlock(readArgs, handler, handler, Type.getInternalName(IOException.class));
    if (needcastcheck) {
        cv.visitTryCatchBlock(readArgs, handler, handler, Type.getInternalName(ClassCastException.class));
    }

    // finally block
    cv.visitLabel(closeInput);
    cv.visitVarInsn(Opcodes.ASTORE, var.allocate("retAddress"));
    cv.visitVarInsn(Opcodes.ALOAD, var.get("remotecall"));
    cv.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(RemoteCall.class), "releaseInputStream",
            Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {}));
    cv.visitVarInsn(Opcodes.RET, var.deallocate("retAddress"));
    var.deallocate("toThrow");

    // do the call using args stored as variables
    cv.visitLabel(doCall);
    cv.visitVarInsn(Opcodes.ALOAD, var.get("remoteobj"));
    for (int i = 0; i < sig.length; i++)
        cv.visitVarInsn(loadOpcode(sig[i]), var.deallocate(param(m, i)));
    cv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(clazz), m.getName(),
            Type.getMethodDescriptor(m));

    Class returntype = m.getReturnType();
    if (!returntype.equals(Void.TYPE)) {
        cv.visitVarInsn(storeOpcode(returntype), var.allocate("result", size(returntype)));
    }

    // write result to result stream
    Label writeResult = new Label();
    cv.visitLabel(writeResult);
    cv.visitVarInsn(Opcodes.ALOAD, var.get("remotecall"));
    cv.visitInsn(Opcodes.ICONST_1);
    cv.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(RemoteCall.class), "getResultStream",
            Type.getMethodDescriptor(Type.getType(ObjectOutput.class), new Type[] { Type.BOOLEAN_TYPE }));

    if (!returntype.equals(Void.TYPE)) {
        // out.writeFoo(result)
        cv.visitVarInsn(loadOpcode(returntype), var.deallocate("result"));
        Class writeCls = returntype.isPrimitive() ? returntype : Object.class;
        cv.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(ObjectOutput.class),
                writeMethod(returntype),
                Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] { Type.getType(writeCls) }));
    }

    cv.visitInsn(Opcodes.RETURN);

    // throw new MarshalException
    Label marshalHandler = new Label();
    cv.visitLabel(marshalHandler);
    cv.visitVarInsn(Opcodes.ASTORE, var.allocate("exception"));
    cv.visitTypeInsn(Opcodes.NEW, typeArg(MarshalException.class));
    cv.visitInsn(Opcodes.DUP);
    cv.visitLdcInsn("error marshalling return");
    cv.visitVarInsn(Opcodes.ALOAD, var.deallocate("exception"));
    cv.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(MarshalException.class), "<init>",
            Type.getMethodDescriptor(Type.VOID_TYPE,
                    new Type[] { Type.getType(String.class), Type.getType(Exception.class) }));
    cv.visitInsn(Opcodes.ATHROW);
    cv.visitTryCatchBlock(writeResult, marshalHandler, marshalHandler, Type.getInternalName(IOException.class));
}

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

License:Open Source License

private static int returnOpcode(Class cls) {
    int returncode;
    if (cls.equals(Boolean.TYPE))
        returncode = Opcodes.IRETURN;/*from w  ww  .ja  v a  2 s.co m*/
    else if (cls.equals(Byte.TYPE))
        returncode = Opcodes.IRETURN;
    else if (cls.equals(Character.TYPE))
        returncode = Opcodes.IRETURN;
    else if (cls.equals(Short.TYPE))
        returncode = Opcodes.IRETURN;
    else if (cls.equals(Integer.TYPE))
        returncode = Opcodes.IRETURN;
    else if (cls.equals(Long.TYPE))
        returncode = Opcodes.LRETURN;
    else if (cls.equals(Float.TYPE))
        returncode = Opcodes.FRETURN;
    else if (cls.equals(Double.TYPE))
        returncode = Opcodes.DRETURN;
    else if (cls.equals(Void.TYPE))
        returncode = Opcodes.RETURN;
    else
        returncode = Opcodes.ARETURN;

    return returncode;
}

From source file:instrumentation.InstrumentationMethodAdapter.java

License:Open Source License

public void visitInsn(int opcode) {

    switch (opcode) {
    case Opcodes.MONITORENTER:
        insertCode(opcode, "MonitorEnterBefore");
        mv.visitInsn(Opcodes.DUP);/*from  w  ww.  j ava  2  s  .  co  m*/
        mv.visitInsn(opcode);
        insertCode(opcode, "MonitorEnterAfter");
        mv.visitInsn(Opcodes.POP);
        break;
    case Opcodes.MONITOREXIT:
        insertCode(opcode, "MonitorExitBefore");
        mv.visitInsn(opcode);
        break;
    case Opcodes.ATHROW:
    case Opcodes.RETURN:
    case Opcodes.IRETURN:
    case Opcodes.LRETURN:
    case Opcodes.FRETURN:
    case Opcodes.DRETURN:
    case Opcodes.ARETURN:
        addMonitorExitBeforeReturn();
        mv.visitInsn(opcode);
        break;
    default:
        mv.visitInsn(opcode);
    }

}

From source file:io.awacs.plugin.stacktrace.ClassTransformer.java

License:Apache License

/**
 * ?//from w  ww. ja  v a2s  . c  o m
 * 1?try catch?                 try{
 * 2????        io.awacs.plugin.stacktrace.StackFrames.init();
 * 3????                io.awacs.plugin.stacktrace.StackFrames.push(className,methodName,0);
 * 4?                          Object val = methodName_origin_className(args);
 * 5?????                io.awacs.plugin.stacktrace.StackFrames.push(className,methodName,1);
 * 5???          List list = io.awacs.plugin.stacktrace.StackFrames.dump();
 * 7?????          io.awacs.plugin.stacktrace.StackTracePlugin.incrAccess(list);
 * 8?                          return val;
 * }catch(java.lang.Exception e){
 * 9??                io.awacs.plugin.stacktrace.StackTracePlugin.incrFailure(e);
 * 10?               throw e;
 * }
 */
private void transformTerminatedMethod(MethodNode origin, MethodNode proxy, ClassNode owner) {
    LabelNode l0 = new LabelNode();
    LabelNode l1 = new LabelNode();
    LabelNode l2 = new LabelNode();
    //try catch?
    proxy.tryCatchBlocks.add(new TryCatchBlockNode(l0, l1, l2, "java/lang/Exception"));
    proxy.instructions.add(l0);
    //?
    proxy.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "io/awacs/plugin/stacktrace/StackFrames",
            "init", "()V", false));
    proxy.instructions.add(new LdcInsnNode(owner.name.replaceAll("/", ".")));
    proxy.instructions.add(new LdcInsnNode(proxy.name));
    proxy.instructions.add(new LdcInsnNode(0));
    //
    proxy.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "io/awacs/plugin/stacktrace/StackFrames",
            "push", "(Ljava/lang/String;Ljava/lang/String;I)V", false));
    int varIndex = 0;//???
    //???,????this?
    if ((proxy.access & Opcodes.ACC_STATIC) != Opcodes.ACC_STATIC) {
        proxy.instructions.add(new VarInsnNode(Opcodes.ALOAD, 0));
        varIndex = 1;
    }
    List<String> parameters = resolveParameters(proxy.desc);
    //???
    for (String param : parameters) {
        VarInsnNode insnNode;
        switch (param) {
        case "J":
            insnNode = new VarInsnNode(Opcodes.LLOAD, varIndex);
            varIndex += 2;
            break;
        case "D":
            insnNode = new VarInsnNode(Opcodes.DLOAD, varIndex);
            varIndex += 2;
            break;
        case "F":
            insnNode = new VarInsnNode(Opcodes.FLOAD, varIndex++);
            break;
        case "I":
            insnNode = new VarInsnNode(Opcodes.ILOAD, varIndex++);
            break;
        case "S":
            insnNode = new VarInsnNode(Opcodes.ILOAD, varIndex++);
            break;
        case "Z":
            insnNode = new VarInsnNode(Opcodes.ILOAD, varIndex++);
            break;
        case "B":
            insnNode = new VarInsnNode(Opcodes.ILOAD, varIndex++);
            break;
        case "C":
            insnNode = new VarInsnNode(Opcodes.ILOAD, varIndex++);
            break;
        default:
            insnNode = new VarInsnNode(Opcodes.ALOAD, varIndex++);
            break;
        }
        proxy.instructions.add(insnNode);
    }
    //
    if ((origin.access & Opcodes.ACC_STATIC) == Opcodes.ACC_STATIC)
        proxy.instructions
                .add(new MethodInsnNode(Opcodes.INVOKESTATIC, owner.name, origin.name, origin.desc, false));
    else
        proxy.instructions
                .add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, owner.name, origin.name, origin.desc, false));
    proxy.instructions.add(new LdcInsnNode(owner.name.replaceAll("/", ".")));
    proxy.instructions.add(new LdcInsnNode(proxy.name));
    proxy.instructions.add(new LdcInsnNode(1));
    //?
    proxy.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "io/awacs/plugin/stacktrace/StackFrames",
            "push", "(Ljava/lang/String;Ljava/lang/String;I)V", false));
    //??
    proxy.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "io/awacs/plugin/stacktrace/StackFrames",
            "dump", "()Ljava/util/List;", false));
    //???
    proxy.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC,
            "io/awacs/plugin/stacktrace/StackTracePlugin", "incrAccess", "(Ljava/util/List;)V", false));
    proxy.instructions.add(l1);
    //
    String returnType = origin.desc.substring(origin.desc.indexOf(')') + 1);
    switch (returnType) {
    case "J":
        proxy.instructions.add(new InsnNode(Opcodes.LRETURN));
        break;
    case "D":
        proxy.instructions.add(new InsnNode(Opcodes.DRETURN));
        break;
    case "F":
        proxy.instructions.add(new InsnNode(Opcodes.FRETURN));
        break;
    case "I":
        proxy.instructions.add(new InsnNode(Opcodes.IRETURN));
        break;
    case "S":
        proxy.instructions.add(new InsnNode(Opcodes.IRETURN));
        break;
    case "C":
        proxy.instructions.add(new InsnNode(Opcodes.IRETURN));
        break;
    case "B":
        proxy.instructions.add(new InsnNode(Opcodes.IRETURN));
        break;
    case "Z":
        proxy.instructions.add(new InsnNode(Opcodes.IRETURN));
        break;
    case "V":
        proxy.instructions.add(new InsnNode(Opcodes.RETURN));
        break;
    default:
        proxy.instructions.add(new InsnNode(Opcodes.ARETURN));
        break;
    }
    proxy.instructions.add(l2);
    //?
    proxy.instructions.add(new FrameNode(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/Exception" }));
    proxy.instructions.add(new VarInsnNode(Opcodes.ASTORE, varIndex));
    proxy.instructions.add(new VarInsnNode(Opcodes.ALOAD, varIndex));
    proxy.instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC,
            "io/awacs/plugin/stacktrace/StackTracePlugin", "incrFailure", "(Ljava/lang/Throwable;)V", false));
    proxy.instructions.add(new VarInsnNode(Opcodes.ALOAD, varIndex));
    proxy.instructions.add(new InsnNode(Opcodes.ATHROW));
    proxy.maxLocals = varIndex + 1;
    proxy.maxStack = Math.max(varIndex, 5);
}

From source file:io.awacs.plugin.stacktrace.ClassTransformer.java

License:Apache License

/**
 * ??/*  w w  w  .  j  a v a 2  s  .  c  o m*/
 * 1?StackFrames.push(0)???
 * 2???this???
 * 3?StackFrames.push(1)???
 * 4??
 */
private void transformPlainMethod(MethodNode mn, ClassNode cn) {
    InsnList before = new InsnList();
    before.add(new LdcInsnNode(cn.name.replaceAll("/", ".")));
    before.add(new LdcInsnNode(mn.name));
    before.add(new LdcInsnNode(0));
    before.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "io/awacs/plugin/stacktrace/StackFrames", "push",
            "(Ljava/lang/String;Ljava/lang/String;I)V", false));
    InsnList end = new InsnList();
    end.add(new LdcInsnNode(cn.name.replaceAll("/", ".")));
    end.add(new LdcInsnNode(mn.name));
    end.add(new LdcInsnNode(1));
    end.add(new MethodInsnNode(Opcodes.INVOKESTATIC, "io/awacs/plugin/stacktrace/StackFrames", "push",
            "(Ljava/lang/String;Ljava/lang/String;I)V", false));

    List<AbstractInsnNode> insts = new LinkedList<>();
    for (int i = 0; i < mn.instructions.size(); i++) {
        int opcode = mn.instructions.get(i).getOpcode();
        if (opcode >= Opcodes.IRETURN && opcode <= Opcodes.RETURN) {
            insts.add(mn.instructions.get(i));
        }
    }
    if (!insts.isEmpty()) {
        mn.instructions.insert(before);
        for (AbstractInsnNode node : insts) {
            mn.instructions.insertBefore(node, end);
        }
    }
    mn.maxStack = mn.maxStack + 5;
}

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * Add code to the end of the class. We are adding the IController methods
 * @see org.objectweb.asm.ClassVisitor#visitEnd()
 *//*  w w  w. j  a  va2s . co m*/
@Override
public void visitEnd() {
    //
    // private static Map<String,Boolean> _asActions;
    //
    {
        // private static Ljava/util/Map; _asActions
        FieldVisitor fv = cv.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC, "_asActions",
                "Ljava/util/Map;", "Ljava/util/Map<Ljava/lang/String;Ljava/lang/Boolean;>;", null);
        fv.visitEnd();
    }
    //
    // private static Map<String,Class<?>> _asConverters;
    //
    {
        FieldVisitor fv = cv.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC, "_asConverters",
                "Ljava/util/Map;", "Ljava/util/Map<Ljava/lang/String;Ljava/lang/Class<*>;>;", null);
        fv.visitEnd();
    }
    //
    // private static Map<String,Class<?>[]> _asInterceptors;
    //
    {
        FieldVisitor fv = cv.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC, "_asInterceptors",
                "Ljava/util/Map;", "Ljava/util/Map<Ljava/lang/String;[Ljava/lang/Class<*>;>;", null);
        fv.visitEnd();
    }
    //
    // private static Map<String,Class<?>> _asParameters;
    //
    {
        FieldVisitor fv = cv.visitField(Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC, "_asParameters",
                "Ljava/util/Map;", "Ljava/util/Map<Ljava/lang/String;Ljava/lang/Class<*>;>;", null);
        fv.visitEnd();
    }

    if (!createdStaticMethod) {
        MethodVisitor mv = cv.visitMethod(Opcodes.ACC_STATIC, "<clinit>", "()V", null, null);
        mv.visitCode();
        mv = new OControllerStaticMethodVisitor(mv, reflector);
        mv.visitInsn(Opcodes.RETURN);
        mv.visitMaxs(0, 0);
        mv.visitEnd();
    }

    createUrlMethod();

    createContextMethod("_asApplicationContext", Type.getDescriptor(ApplicationContext.class),
            reflector.getApplicationContext());
    createContextMethod("_asErrorContext", Type.getDescriptor(ErrorContext.class), reflector.getErrorContext());
    createContextMethod("_asCookieContext", Type.getDescriptor(CookieContext.class),
            reflector.getCookieContext());
    createContextMethod("_asMessageContext", Type.getDescriptor(MessageContext.class),
            reflector.getMessageContext());
    createContextMethod("_asRequestContext", Type.getDescriptor(RequestContext.class),
            reflector.getRequestContext());
    createContextMethod("_asSessionContext", Type.getDescriptor(SessionContext.class),
            reflector.getSessionContext());

    createParametersMethod();
    createParametersSetterMethod();
    createParametersGetterMethod();
    createParameterConverterMethod();

    createActionMethod();
    createActionInterceptorsMethod();
    createActionIsDefinedMethod();
}

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * Generates context method setter: /*from   w w w .ja v  a 2 s  .  c  o  m*/
 * 
 * public void _as(Application|Error|Message|...)Context((Application|Error|Message|...)Context variable) {
 *    this.variable = variable
 *       or
 *    // do nothing
 * }
 */
private void createContextMethod(String methodName, String typeDescriptor, String variableName) {
    if (variableName != null) {
        MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, methodName, "(" + typeDescriptor + ")V", null,
                null);
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        mv.visitLabel(l0);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitVarInsn(Opcodes.ALOAD, 1);
        mv.visitFieldInsn(Opcodes.PUTFIELD, reflector.getClazzInternalName(), variableName, typeDescriptor);
        mv.visitLabel(l1);
        mv.visitInsn(Opcodes.RETURN);
        mv.visitLabel(l2);
        mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, l0, l2, 0);
        mv.visitLocalVariable(variableName, typeDescriptor, null, l0, l2, 1);
        mv.visitMaxs(2, 2);
        mv.visitEnd();
    } else {
        MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, methodName, "(" + typeDescriptor + ")V", null,
                null);
        Label l0 = new Label();
        Label l1 = new Label();
        mv.visitLabel(l0);
        mv.visitInsn(Opcodes.RETURN);
        mv.visitLabel(l1);
        mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, l0, l1, 0);
        mv.visitLocalVariable("argument", typeDescriptor, null, l0, l1, 1);
    }
}

From source file:io.syncframework.optimizer.OControllerClassVisitor.java

License:Apache License

/**
 * Creates the code as:// ww w.  j  a  v a2 s  .c o  m
 * 
 * public void _asParameter(String name, Object value) {
 *    if(name.equals("name") {
 *       setName((String)value);
 *       return;
 *    }
 *   if(name.equals("date") {
 *      setDate((Date)value);
 *      return;
 *   }
 *   ...
 *    return;
 * } 
 */
private void createParametersSetterMethod() {
    MethodVisitor mv = cv.visitMethod(Opcodes.ACC_PUBLIC, "_asParameter",
            "(Ljava/lang/String;Ljava/lang/Object;)V", null, null);

    Label start = new Label();
    Label next = new Label();
    Label variable = new Label();
    boolean first = true;

    for (String name : reflector.getParameters().keySet()) {
        Label l0 = null;
        Label l1 = new Label();
        Label l2 = new Label();

        if (first) {
            l0 = new Label();
            first = false;
        } else {
            l0 = next;
            next = new Label();
        }

        mv.visitLabel(l0);
        if (!first)
            mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(Opcodes.ALOAD, 1);
        mv.visitLdcInsn(name);
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
        mv.visitJumpInsn(Opcodes.IFEQ, next);

        Class<?> parameterType = reflector.getParameters().get(name);

        String setterMethodName = reflector.getSetters().get(name).getName();
        String setterMethodDesc = "(" + Type.getDescriptor(parameterType) + ")V";

        mv.visitLabel(l1);
        mv.visitVarInsn(Opcodes.ALOAD, 0);
        mv.visitVarInsn(Opcodes.ALOAD, 2);
        mv.visitTypeInsn(Opcodes.CHECKCAST, Type.getInternalName(parameterType));
        mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, reflector.getClazzInternalName(), setterMethodName,
                setterMethodDesc, false);

        mv.visitLabel(l2);
        mv.visitInsn(Opcodes.RETURN);
    }

    mv.visitLabel(next);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitInsn(Opcodes.RETURN);

    mv.visitLabel(variable);
    mv.visitLocalVariable("this", reflector.getClazzDescriptor(), null, start, next, 0);
    mv.visitLocalVariable("name", "Ljava/lang/String;", null, start, next, 1);
    mv.visitLocalVariable("value", "Ljava/lang/Object;", null, start, next, 2);
    mv.visitMaxs(2, 3);
    mv.visitEnd();
}