NegateCheckedInstruction.cs

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using System.Dynamic.Utils;
 
namespace System.Linq.Expressions.Interpreter;
 
internal abstract class NegateCheckedInstruction : Instruction
{
    private sealed class NegateCheckedInt32 : NegateCheckedInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push(checked(-(int)obj));
            }
            return 1;
        }
    }
 
    private sealed class NegateCheckedInt16 : NegateCheckedInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push(checked((short)(-(short)obj)));
            }
            return 1;
        }
    }
 
    private sealed class NegateCheckedInt64 : NegateCheckedInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push(checked(-(long)obj));
            }
            return 1;
        }
    }
 
    private static Instruction s_Int16;
 
    private static Instruction s_Int32;
 
    private static Instruction s_Int64;
 
    public override int ConsumedStack => 1;
 
    public override int ProducedStack => 1;
 
    public override string InstructionName => "NegateChecked";
 
    private NegateCheckedInstruction()
    {
    }
 
    public static Instruction Create(Type type)
    {
        return type.GetNonNullableType().GetTypeCode() switch
        {
            TypeCode.Int16 => s_Int16 ?? (s_Int16 = new NegateCheckedInt16()), 
            TypeCode.Int32 => s_Int32 ?? (s_Int32 = new NegateCheckedInt32()), 
            TypeCode.Int64 => s_Int64 ?? (s_Int64 = new NegateCheckedInt64()), 
            _ => NegateInstruction.Create(type), 
        };
    }
}