DecrementInstruction.cs

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using System.Dynamic.Utils;
 
namespace System.Linq.Expressions.Interpreter;
 
internal abstract class DecrementInstruction : Instruction
{
    private sealed class DecrementInt16 : DecrementInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push((short)((short)obj - 1));
            }
            return 1;
        }
    }
 
    private sealed class DecrementInt32 : DecrementInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push((int)obj - 1);
            }
            return 1;
        }
    }
 
    private sealed class DecrementInt64 : DecrementInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push((long)obj - 1);
            }
            return 1;
        }
    }
 
    private sealed class DecrementUInt16 : DecrementInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push((ushort)((ushort)obj - 1));
            }
            return 1;
        }
    }
 
    private sealed class DecrementUInt32 : DecrementInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push((uint)obj - 1);
            }
            return 1;
        }
    }
 
    private sealed class DecrementUInt64 : DecrementInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push((ulong)obj - 1);
            }
            return 1;
        }
    }
 
    private sealed class DecrementSingle : DecrementInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push((float)obj - 1f);
            }
            return 1;
        }
    }
 
    private sealed class DecrementDouble : DecrementInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            if (obj == null)
            {
                frame.Push(null);
            }
            else
            {
                frame.Push((double)obj - 1.0);
            }
            return 1;
        }
    }
 
    private static Instruction s_Int16;
 
    private static Instruction s_Int32;
 
    private static Instruction s_Int64;
 
    private static Instruction s_UInt16;
 
    private static Instruction s_UInt32;
 
    private static Instruction s_UInt64;
 
    private static Instruction s_Single;
 
    private static Instruction s_Double;
 
    public override int ConsumedStack => 1;
 
    public override int ProducedStack => 1;
 
    public override string InstructionName => "Decrement";
 
    private DecrementInstruction()
    {
    }
 
    public static Instruction Create(Type type)
    {
        return type.GetNonNullableType().GetTypeCode() switch
        {
            TypeCode.Int16 => s_Int16 ?? (s_Int16 = new DecrementInt16()), 
            TypeCode.Int32 => s_Int32 ?? (s_Int32 = new DecrementInt32()), 
            TypeCode.Int64 => s_Int64 ?? (s_Int64 = new DecrementInt64()), 
            TypeCode.UInt16 => s_UInt16 ?? (s_UInt16 = new DecrementUInt16()), 
            TypeCode.UInt32 => s_UInt32 ?? (s_UInt32 = new DecrementUInt32()), 
            TypeCode.UInt64 => s_UInt64 ?? (s_UInt64 = new DecrementUInt64()), 
            TypeCode.Single => s_Single ?? (s_Single = new DecrementSingle()), 
            TypeCode.Double => s_Double ?? (s_Double = new DecrementDouble()), 
            _ => throw ContractUtils.Unreachable, 
        };
    }
}