Examples with ClassEmitter org.springframework.cglib.core.ClassEmitter used on opensource projects

Example 1 with ClassEmitter

use of org.springframework.cglib.core.ClassEmitter in project spring-framework by spring-projects.

the class Enhancer method emitMethods.

private void emitMethods(final ClassEmitter ce, List methods, List actualMethods) {
    CallbackGenerator[] generators = CallbackInfo.getGenerators(callbackTypes);
    Map groups = new HashMap();
    final Map indexes = new HashMap();
    final Map originalModifiers = new HashMap();
    final Map positions = CollectionUtils.getIndexMap(methods);
    final Map declToBridge = new HashMap();
    Iterator it1 = methods.iterator();
    Iterator it2 = (actualMethods != null) ? actualMethods.iterator() : null;
    while (it1.hasNext()) {
        MethodInfo method = (MethodInfo) it1.next();
        Method actualMethod = (it2 != null) ? (Method) it2.next() : null;
        int index = filter.accept(actualMethod);
        if (index >= callbackTypes.length) {
            throw new IllegalArgumentException("Callback filter returned an index that is too large: " + index);
        }
        originalModifiers.put(method, (actualMethod != null ? actualMethod.getModifiers() : method.getModifiers()));
        indexes.put(method, index);
        List group = (List) groups.get(generators[index]);
        if (group == null) {
            groups.put(generators[index], group = new ArrayList(methods.size()));
        }
        group.add(method);
        // so that we can look up all the bridge methods in one pass for a class.
        if (TypeUtils.isBridge(actualMethod.getModifiers())) {
            Set bridges = (Set) declToBridge.get(actualMethod.getDeclaringClass());
            if (bridges == null) {
                bridges = new HashSet();
                declToBridge.put(actualMethod.getDeclaringClass(), bridges);
            }
            bridges.add(method.getSignature());
        }
    }
    final Map bridgeToTarget = new BridgeMethodResolver(declToBridge, getClassLoader()).resolveAll();
    Set seenGen = new HashSet();
    CodeEmitter se = ce.getStaticHook();
    se.new_instance(THREAD_LOCAL);
    se.dup();
    se.invoke_constructor(THREAD_LOCAL, CSTRUCT_NULL);
    se.putfield(THREAD_CALLBACKS_FIELD);
    final Object[] state = new Object[1];
    CallbackGenerator.Context context = new CallbackGenerator.Context() {

        public ClassLoader getClassLoader() {
            return Enhancer.this.getClassLoader();
        }

        public int getOriginalModifiers(MethodInfo method) {
            return ((Integer) originalModifiers.get(method)).intValue();
        }

        public int getIndex(MethodInfo method) {
            return ((Integer) indexes.get(method)).intValue();
        }

        public void emitCallback(CodeEmitter e, int index) {
            emitCurrentCallback(e, index);
        }

        public Signature getImplSignature(MethodInfo method) {
            return rename(method.getSignature(), ((Integer) positions.get(method)).intValue());
        }

        public void emitLoadArgsAndInvoke(CodeEmitter e, MethodInfo method) {
            // If this is a bridge and we know the target was called from invokespecial,
            // then we need to invoke_virtual w/ the bridge target instead of doing
            // a super, because super may itself be using super, which would bypass
            // any proxies on the target.
            Signature bridgeTarget = (Signature) bridgeToTarget.get(method.getSignature());
            if (bridgeTarget != null) {
                // checkcast each argument against the target's argument types
                for (int i = 0; i < bridgeTarget.getArgumentTypes().length; i++) {
                    e.load_arg(i);
                    Type target = bridgeTarget.getArgumentTypes()[i];
                    if (!target.equals(method.getSignature().getArgumentTypes()[i])) {
                        e.checkcast(target);
                    }
                }
                e.invoke_virtual_this(bridgeTarget);
                Type retType = method.getSignature().getReturnType();
                // method.)
                if (!retType.equals(bridgeTarget.getReturnType())) {
                    e.checkcast(retType);
                }
            } else {
                e.load_args();
                e.super_invoke(method.getSignature());
            }
        }

        public CodeEmitter beginMethod(ClassEmitter ce, MethodInfo method) {
            CodeEmitter e = EmitUtils.begin_method(ce, method);
            if (!interceptDuringConstruction && !TypeUtils.isAbstract(method.getModifiers())) {
                Label constructed = e.make_label();
                e.load_this();
                e.getfield(CONSTRUCTED_FIELD);
                e.if_jump(CodeEmitter.NE, constructed);
                e.load_this();
                e.load_args();
                e.super_invoke();
                e.return_value();
                e.mark(constructed);
            }
            return e;
        }
    };
    for (int i = 0; i < callbackTypes.length; i++) {
        CallbackGenerator gen = generators[i];
        if (!seenGen.contains(gen)) {
            seenGen.add(gen);
            final List fmethods = (List) groups.get(gen);
            if (fmethods != null) {
                try {
                    gen.generate(ce, context, fmethods);
                    gen.generateStatic(se, context, fmethods);
                } catch (RuntimeException x) {
                    throw x;
                } catch (Exception x) {
                    throw new CodeGenerationException(x);
                }
            }
        }
    }
    se.return_value();
    se.end_method();
}

Example 2 with ClassEmitter

use of org.springframework.cglib.core.ClassEmitter in project spring-framework by spring-projects.

the class Enhancer method generateClass.

public void generateClass(ClassVisitor v) throws Exception {
    Class sc = (superclass == null) ? Object.class : superclass;
    if (TypeUtils.isFinal(sc.getModifiers()))
        throw new IllegalArgumentException("Cannot subclass final class " + sc.getName());
    List constructors = new ArrayList(Arrays.asList(sc.getDeclaredConstructors()));
    filterConstructors(sc, constructors);
    // Order is very important: must add superclass, then
    // its superclass chain, then each interface and
    // its superinterfaces.
    List actualMethods = new ArrayList();
    List interfaceMethods = new ArrayList();
    final Set forcePublic = new HashSet();
    getMethods(sc, interfaces, actualMethods, interfaceMethods, forcePublic);
    List methods = CollectionUtils.transform(actualMethods, new Transformer() {

        public Object transform(Object value) {
            Method method = (Method) value;
            int modifiers = Constants.ACC_FINAL | (method.getModifiers() & ~Constants.ACC_ABSTRACT & ~Constants.ACC_NATIVE & ~Constants.ACC_SYNCHRONIZED);
            if (forcePublic.contains(MethodWrapper.create(method))) {
                modifiers = (modifiers & ~Constants.ACC_PROTECTED) | Constants.ACC_PUBLIC;
            }
            return ReflectUtils.getMethodInfo(method, modifiers);
        }
    });
    ClassEmitter e = new ClassEmitter(v);
    if (currentData == null) {
        e.begin_class(Constants.V1_8, Constants.ACC_PUBLIC, getClassName(), Type.getType(sc), (useFactory ? TypeUtils.add(TypeUtils.getTypes(interfaces), FACTORY) : TypeUtils.getTypes(interfaces)), Constants.SOURCE_FILE);
    } else {
        e.begin_class(Constants.V1_8, Constants.ACC_PUBLIC, getClassName(), null, new Type[] { FACTORY }, Constants.SOURCE_FILE);
    }
    List constructorInfo = CollectionUtils.transform(constructors, MethodInfoTransformer.getInstance());
    e.declare_field(Constants.ACC_PRIVATE, BOUND_FIELD, Type.BOOLEAN_TYPE, null);
    e.declare_field(Constants.ACC_PUBLIC | Constants.ACC_STATIC, FACTORY_DATA_FIELD, OBJECT_TYPE, null);
    if (!interceptDuringConstruction) {
        e.declare_field(Constants.ACC_PRIVATE, CONSTRUCTED_FIELD, Type.BOOLEAN_TYPE, null);
    }
    e.declare_field(Constants.PRIVATE_FINAL_STATIC, THREAD_CALLBACKS_FIELD, THREAD_LOCAL, null);
    e.declare_field(Constants.PRIVATE_FINAL_STATIC, STATIC_CALLBACKS_FIELD, CALLBACK_ARRAY, null);
    if (serialVersionUID != null) {
        e.declare_field(Constants.PRIVATE_FINAL_STATIC, Constants.SUID_FIELD_NAME, Type.LONG_TYPE, serialVersionUID);
    }
    for (int i = 0; i < callbackTypes.length; i++) {
        e.declare_field(Constants.ACC_PRIVATE, getCallbackField(i), callbackTypes[i], null);
    }
    // This is declared private to avoid "public field" pollution
    e.declare_field(Constants.ACC_PRIVATE | Constants.ACC_STATIC, CALLBACK_FILTER_FIELD, OBJECT_TYPE, null);
    if (currentData == null) {
        emitMethods(e, methods, actualMethods);
        emitConstructors(e, constructorInfo);
    } else {
        emitDefaultConstructor(e);
    }
    emitSetThreadCallbacks(e);
    emitSetStaticCallbacks(e);
    emitBindCallbacks(e);
    if (useFactory || currentData != null) {
        int[] keys = getCallbackKeys();
        emitNewInstanceCallbacks(e);
        emitNewInstanceCallback(e);
        emitNewInstanceMultiarg(e, constructorInfo);
        emitGetCallback(e, keys);
        emitSetCallback(e, keys);
        emitGetCallbacks(e);
        emitSetCallbacks(e);
    }
    e.end_class();
}