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/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 * 
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 * 
 * (a) the Software, and
 * 
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 * 
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 * 
 * This license is subject to the following condition:
 * 
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
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 * 
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 */
package com.oracle.truffle.sl.runtime;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.sl.nodes.call.SLDispatchNode;
import com.oracle.truffle.sl.nodes.call.SLDispatchNodeGen;
import java.math.BigInteger;
import java.util.List;

/**
 * Implementation of foreign access for {@link SLFunction}.
 */
final class SLFunctionForeignAccess implements ForeignAccess.Factory {
    public static final ForeignAccess INSTANCE = ForeignAccess.create(new SLFunctionForeignAccess());

    private SLFunctionForeignAccess() {
    }

    @Override
    public boolean canHandle(TruffleObject o) {
        return o instanceof SLFunction;
    }

    @Override
    public CallTarget accessMessage(Message tree) {
        if (Message.createExecute(0).equals(tree)) {
            return Truffle.getRuntime().createCallTarget(new SLForeignCallerRootNode());
        } else if (Message.IS_NULL.equals(tree)) {
            return Truffle.getRuntime().createCallTarget(new SLForeignNullCheckNode());
        } else {
            throw new IllegalArgumentException(tree.toString() + " not supported");
        }
    }

    private static class SLForeignCallerRootNode extends RootNode {
        @Child private SLDispatchNode dispatch = SLDispatchNodeGen.create();

        @Override
        public Object execute(VirtualFrame frame) {
            SLFunction function = (SLFunction) ForeignAccess.getReceiver(frame);
            // the calling convention of interop passes the receiver of a
            // function call (the this object)
            // as an implicit 1st argument; we need to ignore this argument for SL
            List