ThrowInstruction.cs

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using System.Runtime.CompilerServices;
 
namespace System.Linq.Expressions.Interpreter;
 
internal sealed class ThrowInstruction : Instruction
{
    internal static readonly ThrowInstruction Throw = new ThrowInstruction(hasResult: true, isRethrow: false);
 
    internal static readonly ThrowInstruction VoidThrow = new ThrowInstruction(hasResult: false, isRethrow: false);
 
    internal static readonly ThrowInstruction Rethrow = new ThrowInstruction(hasResult: true, isRethrow: true);
 
    internal static readonly ThrowInstruction VoidRethrow = new ThrowInstruction(hasResult: false, isRethrow: true);
 
    private readonly bool _hasResult;
 
    private readonly bool _rethrow;
 
    public override string InstructionName => "Throw";
 
    public override int ProducedStack
    {
        get
        {
            if (!_hasResult)
            {
                return 0;
            }
            return 1;
        }
    }
 
    public override int ConsumedStack => 1;
 
    private ThrowInstruction(bool hasResult, bool isRethrow)
    {
        _hasResult = hasResult;
        _rethrow = isRethrow;
    }
 
    public override int Run(InterpretedFrame frame)
    {
        Exception ex = WrapThrownObject(frame.Pop());
        if (_rethrow)
        {
            throw new RethrowException();
        }
        throw ex;
    }
 
    private static Exception WrapThrownObject(object thrown)
    {
        object obj;
        if (thrown != null)
        {
            obj = thrown as Exception;
            if (obj == null)
            {
                return new RuntimeWrappedException(thrown);
            }
        }
        else
        {
            obj = null;
        }
        return (Exception)obj;
    }
}