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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.
 *
 * 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
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
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 * This license is subject to the following condition:
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 * 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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package com.oracle.truffle.sl.nodes.call;

import com.oracle.truffle.api.*;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.NodeChildren;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.*;
import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.nodes.*;
import com.oracle.truffle.api.source.*;
import com.oracle.truffle.sl.nodes.*;
import com.oracle.truffle.sl.runtime.*;

/**
 * The node for function invocation in SL. Since SL has first class functions, the
 * {@link SLFunction target function} can be computed by an arbitrary expression. This node is
 * responsible for evaluating this expression, as well as evaluating the {@link #argumentNodes
 * arguments}. The actual dispatch is then delegated to a chain of {@link SLDispatchNode} that form
 * a polymorphic inline cache.
 */
@NodeInfo(shortName = "invoke")
@NodeChildren({@NodeChild(value = "functionNode", type = SLExpressionNode.class)})
public abstract class SLInvokeNode extends SLExpressionNode {
    @Children private final SLExpressionNode[] argumentNodes;
    @Child private SLDispatchNode dispatchNode;

    SLInvokeNode(SourceSection src, SLExpressionNode[] argumentNodes) {
        super(src);
        this.argumentNodes = argumentNodes;
        this.dispatchNode = SLDispatchNodeGen.create();
    }

    @Specialization
    @ExplodeLoop
    public Object executeGeneric(VirtualFrame frame, SLFunction function) {
        /*
         * The number of arguments is constant for one invoke node. During compilation, the loop is
         * unrolled and the execute methods of all arguments are inlined. This is triggered by the
         * ExplodeLoop annotation on the method. The compiler assertion below illustrates that the
         * array length is really constant.
         */
        CompilerAsserts.compilationConstant(argumentNodes.length);

        Object[] argumentValues = new Object[argumentNodes.length];
        for (int i = 0; i < argumentNodes.length; i++) {
            argumentValues[i] = argumentNodes[i].executeGeneric(frame);
        }
        return dispatchNode.executeDispatch(frame, function, argumentValues);
    }

    @Child private Node crossLanguageCall;

    @Specialization
    @ExplodeLoop
    protected Object executeGeneric(VirtualFrame frame, TruffleObject function) {
        /*
         * The number of arguments is constant for one invoke node. During compilation, the loop is
         * unrolled and the execute methods of all arguments are inlined. This is triggered by the
         * ExplodeLoop annotation on the method. The compiler assertion below illustrates that the
         * array length is really constant.
         */
        CompilerAsserts.compilationConstant(argumentNodes.length);

        Object[] argumentValues = new Object[argumentNodes.length];
        for (int i = 0; i < argumentNodes.length; i++) {
            argumentValues[i] = argumentNodes[i].executeGeneric(frame);
        }
        if (crossLanguageCall == null) {
            crossLanguageCall = insert(Message.createExecute(argumentValues.length).createNode());
        }
        return ForeignAccess.execute(crossLanguageCall, frame, function, argumentValues);
    }
}