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Truffle SL is an example language implemented using the Truffle API.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * The Universal Permissive License (UPL), Version 1.0
 *
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 * 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
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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 * is contributed by such licensors),
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 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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package com.oracle.truffle.sl.runtime;

import static com.oracle.truffle.sl.runtime.SLContext.fromForeignValue;

import com.oracle.truffle.api.interop.CanResolve;
import com.oracle.truffle.api.interop.MessageResolution;
import com.oracle.truffle.api.interop.Resolve;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.sl.nodes.call.SLDispatchNode;
import com.oracle.truffle.sl.nodes.call.SLDispatchNodeGen;
import com.oracle.truffle.sl.nodes.interop.SLTypeToForeignNode;
import com.oracle.truffle.sl.nodes.interop.SLTypeToForeignNodeGen;

/**
 * The class containing all message resolution implementations of {@link SLFunction}.
 */
/**
 * The class containing all message resolution implementations of {@link SLFunction}.
 */
@MessageResolution(receiverType = SLFunction.class)
public class SLFunctionMessageResolution {
    /*
     * An SL function resolves an EXECUTE message.
     */
    @Resolve(message = "EXECUTE")
    public abstract static class SLForeignFunctionExecuteNode extends Node {

        @Child private SLDispatchNode dispatch = SLDispatchNodeGen.create();
        @Child private SLTypeToForeignNode toForeign = SLTypeToForeignNodeGen.create();

        public Object access(SLFunction receiver, Object[] arguments) {
            Object[] arr = new Object[arguments.length];
            // Before the arguments can be used by the SLFunction, they need to be converted to SL
            // values.
            for (int i = 0; i < arr.length; i++) {
                arr[i] = fromForeignValue(arguments[i]);
            }
            Object result = dispatch.executeDispatch(receiver, arr);
            return toForeign.executeConvert(result);
        }
    }

    /*
     * An SL function should respond to an IS_EXECUTABLE message with true.
     */
    @Resolve(message = "IS_EXECUTABLE")
    public abstract static class SLForeignIsExecutableNode extends Node {
        public Object access(Object receiver) {
            return receiver instanceof SLFunction;
        }
    }

    @CanResolve
    public abstract static class CheckFunction extends Node {

        protected static boolean test(TruffleObject receiver) {
            return receiver instanceof SLFunction;
        }
    }
}