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Truffle is a multi-language framework for executing dynamic languages that achieves high performance when combined with Graal.

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/*
 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.truffle.api.interop.java;

import java.lang.reflect.Array;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.Node;

abstract class ArrayWriteNode extends Node {
    final ToJavaNode toJavaNode = ToJavaNodeGen.create();

    protected abstract Object executeWithTarget(VirtualFrame frame, JavaObject receiver, Object index, Object value);

    @SuppressWarnings("unchecked")
    @Specialization(guards = "index.getClass() == clazz")
    protected final Object doNumber(JavaObject receiver, Number index, Object value,
                    @Cached("index.getClass()") Class clazz) {
        Class numberClazz = (Class) clazz;
        return doArrayAccess(receiver, numberClazz.cast(index).intValue(), value);
    }

    @Specialization(replaces = "doNumber")
    protected final Object doNumberGeneric(JavaObject receiver, Number index, Object value) {
        return doArrayAccess(receiver, index.intValue(), value);
    }

    private Object doArrayAccess(JavaObject receiver, int index, Object value) {
        Object obj = receiver.obj;
        final Object javaValue = toJavaNode.execute(value, TypeAndClass.ANY);
        Array.set(obj, index, javaValue);
        return JavaObject.NULL;
    }
}