Examples with MethodHandle java.lang.invoke.MethodHandle used on opensource projects

Example 51 with MethodHandle

use of java.lang.invoke.MethodHandle in project es6draft by anba.

the class Bootstrap method relCmpSetup.

@SuppressWarnings("unused")
private static MethodHandle relCmpSetup(MutableCallSite callsite, RelationalOperator op, Object arg1, Object arg2, ExecutionContext cx) {
    Type type = getType(arg1, arg2);
    MethodHandle target;
    if (type == Type.String) {
        target = filterReturnValue(relCmpStringMH, op);
    } else if (type == Type.Number) {
        target = filterReturnValue(relCmpNumberMH, op);
    } else {
        target = null;
    }
    return setCallSiteTarget(callsite, target, getTestFor(type), filterReturnValue(MethodHandles.insertArguments(relCmpGenericMH, 2, op), op));
}

Example 52 with MethodHandle

use of java.lang.invoke.MethodHandle in project es6draft by anba.

the class NativeCalls method getNativeMethodHandle.

private static MethodHandle getNativeMethodHandle(String name) {
    if (!name.startsWith("native:")) {
        throw new IllegalArgumentException();
    }
    String methodName = name.substring("native:".length());
    for (Class<?> lookupClass : lookupClasses) {
        MethodLookup lookup = new MethodLookup(MethodHandles.publicLookup().in(lookupClass));
        Method m = findMethod(lookup, methodName);
        if (m == null) {
            continue;
        }
        MethodHandle mh;
        try {
            mh = lookup.getLookup().unreflect(m);
        } catch (IllegalAccessException e) {
            throw new IllegalArgumentException();
        }
        // Allow to omit execution context argument.
        MethodType type = mh.type();
        if (type.parameterCount() == 0 || !type.parameterType(0).equals(ExecutionContext.class)) {
            mh = MethodHandles.dropArguments(mh, 0, ExecutionContext.class);
        }
        // Allow void return type.
        if (type.returnType() == void.class) {
            mh = MethodHandles.filterReturnValue(mh, MethodHandles.constant(Object.class, UNDEFINED));
        }
        return mh;
    }
    throw new IllegalArgumentException();
}

Example 53 with MethodHandle

use of java.lang.invoke.MethodHandle in project es6draft by anba.

the class NativeCalls method toObjectArray.

private static MethodHandle toObjectArray(List<Class<?>> types) {
    MethodHandle mh = MethodHandles.identity(Object[].class);
    mh = mh.asCollector(Object[].class, types.size());
    return mh.asType(MethodType.methodType(Object[].class, types));
}

Example 54 with MethodHandle

use of java.lang.invoke.MethodHandle in project es6draft by anba.

the class Properties method createExternalFunction.

private static <OWNER> NativeFunction createExternalFunction(ExecutionContext cx, OWNER owner, Class<OWNER> holder) {
    ObjectLayout layout = externalLayouts.get(holder);
    if (layout.functions == null || layout.functions.size() != 1) {
        throw new IllegalArgumentException();
    }
    Converter converter = new Converter(cx);
    Entry<Function, MethodHandle> entry = layout.functions.entrySet().iterator().next();
    Function function = entry.getKey();
    MethodHandle handle = getInstanceMethodHandle(cx, converter, entry.getValue(), owner);
    return new NativeFunction(cx.getRealm(), function.name(), function.arity(), handle);
}

Example 55 with MethodHandle

use of java.lang.invoke.MethodHandle in project es6draft by anba.

the class Properties method createExternalAccessors.

private static <OWNER> void createExternalAccessors(ExecutionContext cx, ScriptObject target, OWNER owner, ObjectLayout layout, Converter converter) {
    LinkedHashMap<String, PropertyDescriptor> stringProps = new LinkedHashMap<>();
    EnumMap<BuiltinSymbol, PropertyDescriptor> symbolProps = new EnumMap<>(BuiltinSymbol.class);
    for (Entry<Accessor, MethodHandle> entry : layout.accessors.entrySet()) {
        MethodHandle handle = getInstanceMethodHandle(cx, converter, entry.getValue(), owner);
        createExternalAccessor(cx, entry.getKey(), handle, stringProps, symbolProps);
    }
    defineProperties(cx, target, stringProps, symbolProps);
}