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package com.oracle.truffle.api.nodes;

import com.oracle.truffle.api.CallTarget;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;

/**
 * Represents an indirect call to a {@link CallTarget}. Indirect calls are calls for which the
 * {@link CallTarget} may change dynamically for each consecutive call. This part of the Truffle API
 * enables the runtime system to perform additional optimizations on indirect calls.
 * 
 * Please note: This class is not intended to be sub classed by guest language implementations.
 * 
 * See {@link DirectCallNode} for faster calls with a constantly known {@link CallTarget}.
 * 
 * @since 0.8 or earlier
 */
public abstract class IndirectCallNode extends Node {

    /**
     * Constructor for implementation subclasses.
     *
     * @since 0.8 or earlier
     */
    protected IndirectCallNode() {
        super();
    }

    /**
     * Performs an indirect call to the given {@link CallTarget} target with the provided arguments.
     *
     * @param target the {@link CallTarget} to call
     * @param arguments the arguments to provide
     * @return the return value of the call
     * @since 0.23
     */
    public abstract Object call(CallTarget target, Object... arguments);

    /**
     * Creates cached indirect call node using bytecode index -1.
     *
     * @since 0.8 or earlier
     */
    public static IndirectCallNode create() {
        return NodeAccessor.RUNTIME.createIndirectCallNode();
    }

    private static final IndirectCallNode UNCACHED = new IndirectCallNode() {
        @Override
        public boolean isAdoptable() {
            return false;
        }

        @Override
        @TruffleBoundary
        public Object call(CallTarget target, Object... arguments) {
            return target.call(arguments);
        }
    };

    /**
     * Returns an uncached version of an indirect call node. Uncached versions of an indirect call
     * node use the {@link EncapsulatingNodeReference#get() current encapsulating node} as source
     * location.
     *
     * @since 19.0
     */
    public static IndirectCallNode getUncached() {
        return UNCACHED;
    }

}