PowerShell-PowerShell/src/System.Management.Automation/engine/interpreter/DynamicSplatInstruction.cs

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 * Copyright (c) Microsoft Corporation. 
 *
 * This source code is subject to terms and conditions of the Apache License, Version 2.0. A 
 * copy of the license can be found in the License.html file at the root of this distribution. If 
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using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Reflection;

namespace System.Management.Automation.Interpreter {
    /// <summary>
    /// Implements dynamic call site with many arguments. Wraps the arguments into <see cref="ArgumentArray"/>.
    /// </summary>
    internal sealed partial class DynamicSplatInstruction : Instruction {
        private readonly CallSite<Func<CallSite, ArgumentArray, object>> _site;
        private readonly int _argumentCount;

        internal DynamicSplatInstruction(int argumentCount, CallSite<Func<CallSite, ArgumentArray, object>> site) {
            _site = site;
            _argumentCount = argumentCount;
        }

        public override int ProducedStack { get { return 1; } }
        public override int ConsumedStack { get { return _argumentCount; } }

        public override int Run(InterpretedFrame frame) {
            int first = frame.StackIndex - _argumentCount;
            object ret = _site.Target(_site, new ArgumentArray(frame.Data, first, _argumentCount));
            frame.Data[first] = ret;
            frame.StackIndex = first + 1;

            return 1;
        }

        public override string ToString() {
            return "DynamicSplatInstruction(" + _site + ")";
        }
    }
}