IndexMethodByRefUpdater.cs

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using System.Dynamic.Utils;
using System.Reflection;
 
namespace System.Linq.Expressions.Interpreter;
 
internal sealed class IndexMethodByRefUpdater : ByRefUpdater
{
    private readonly MethodInfo _indexer;
 
    private readonly LocalDefinition? _obj;
 
    private readonly LocalDefinition[] _args;
 
    public IndexMethodByRefUpdater(LocalDefinition? obj, LocalDefinition[] args, MethodInfo indexer, int argumentIndex)
        : base(argumentIndex)
    {
        _obj = obj;
        _args = args;
        _indexer = indexer;
    }
 
    public override void Update(InterpretedFrame frame, object value)
    {
        object[] array = new object[_args.Length + 1];
        for (int i = 0; i < array.Length - 1; i++)
        {
            array[i] = frame.Data[_args[i].Index];
        }
        array[^1] = value;
        object obj = ((!_obj.HasValue) ? null : frame.Data[_obj.GetValueOrDefault().Index]);
        try
        {
            _indexer.Invoke(obj, array);
        }
        catch (TargetInvocationException exception)
        {
            ExceptionHelpers.UnwrapAndRethrow(exception);
            throw ContractUtils.Unreachable;
        }
    }
 
    public override void UndefineTemps(InstructionList instructions, LocalVariables locals)
    {
        if (_obj.HasValue)
        {
            locals.UndefineLocal(_obj.GetValueOrDefault(), instructions.Count);
        }
        for (int i = 0; i < _args.Length; i++)
        {
            locals.UndefineLocal(_args[i], instructions.Count);
        }
    }
}