LessThanInstruction.cs

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using System.Dynamic.Utils;
 
namespace System.Linq.Expressions.Interpreter;
 
internal abstract class LessThanInstruction : Instruction
{
    private sealed class LessThanSByte : LessThanInstruction
    {
        public LessThanSByte(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((sbyte)obj2 < (sbyte)obj);
            }
            return 1;
        }
    }
 
    private sealed class LessThanInt16 : LessThanInstruction
    {
        public LessThanInt16(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((short)obj2 < (short)obj);
            }
            return 1;
        }
    }
 
    private sealed class LessThanChar : LessThanInstruction
    {
        public LessThanChar(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((char)obj2 < (char)obj);
            }
            return 1;
        }
    }
 
    private sealed class LessThanInt32 : LessThanInstruction
    {
        public LessThanInt32(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((int)obj2 < (int)obj);
            }
            return 1;
        }
    }
 
    private sealed class LessThanInt64 : LessThanInstruction
    {
        public LessThanInt64(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((long)obj2 < (long)obj);
            }
            return 1;
        }
    }
 
    private sealed class LessThanByte : LessThanInstruction
    {
        public LessThanByte(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((byte)obj2 < (byte)obj);
            }
            return 1;
        }
    }
 
    private sealed class LessThanUInt16 : LessThanInstruction
    {
        public LessThanUInt16(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((ushort)obj2 < (ushort)obj);
            }
            return 1;
        }
    }
 
    private sealed class LessThanUInt32 : LessThanInstruction
    {
        public LessThanUInt32(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((uint)obj2 < (uint)obj);
            }
            return 1;
        }
    }
 
    private sealed class LessThanUInt64 : LessThanInstruction
    {
        public LessThanUInt64(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((ulong)obj2 < (ulong)obj);
            }
            return 1;
        }
    }
 
    private sealed class LessThanSingle : LessThanInstruction
    {
        public LessThanSingle(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((float)obj2 < (float)obj);
            }
            return 1;
        }
    }
 
    private sealed class LessThanDouble : LessThanInstruction
    {
        public LessThanDouble(object nullValue)
            : base(nullValue)
        {
        }
 
        public override int Run(InterpretedFrame frame)
        {
            object obj = frame.Pop();
            object obj2 = frame.Pop();
            if (obj2 == null || obj == null)
            {
                frame.Push(_nullValue);
            }
            else
            {
                frame.Push((double)obj2 < (double)obj);
            }
            return 1;
        }
    }
 
    private readonly object _nullValue;
 
    private static Instruction s_SByte;
 
    private static Instruction s_Int16;
 
    private static Instruction s_Char;
 
    private static Instruction s_Int32;
 
    private static Instruction s_Int64;
 
    private static Instruction s_Byte;
 
    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;
 
    private static Instruction s_liftedToNullSByte;
 
    private static Instruction s_liftedToNullInt16;
 
    private static Instruction s_liftedToNullChar;
 
    private static Instruction s_liftedToNullInt32;
 
    private static Instruction s_liftedToNullInt64;
 
    private static Instruction s_liftedToNullByte;
 
    private static Instruction s_liftedToNullUInt16;
 
    private static Instruction s_liftedToNullUInt32;
 
    private static Instruction s_liftedToNullUInt64;
 
    private static Instruction s_liftedToNullSingle;
 
    private static Instruction s_liftedToNullDouble;
 
    public override int ConsumedStack => 2;
 
    public override int ProducedStack => 1;
 
    public override string InstructionName => "LessThan";
 
    private LessThanInstruction(object nullValue)
    {
        _nullValue = nullValue;
    }
 
    public static Instruction Create(Type type, bool liftedToNull = false)
    {
        if (liftedToNull)
        {
            return type.GetNonNullableType().GetTypeCode() switch
            {
                TypeCode.SByte => s_liftedToNullSByte ?? (s_liftedToNullSByte = new LessThanSByte(null)), 
                TypeCode.Int16 => s_liftedToNullInt16 ?? (s_liftedToNullInt16 = new LessThanInt16(null)), 
                TypeCode.Char => s_liftedToNullChar ?? (s_liftedToNullChar = new LessThanChar(null)), 
                TypeCode.Int32 => s_liftedToNullInt32 ?? (s_liftedToNullInt32 = new LessThanInt32(null)), 
                TypeCode.Int64 => s_liftedToNullInt64 ?? (s_liftedToNullInt64 = new LessThanInt64(null)), 
                TypeCode.Byte => s_liftedToNullByte ?? (s_liftedToNullByte = new LessThanByte(null)), 
                TypeCode.UInt16 => s_liftedToNullUInt16 ?? (s_liftedToNullUInt16 = new LessThanUInt16(null)), 
                TypeCode.UInt32 => s_liftedToNullUInt32 ?? (s_liftedToNullUInt32 = new LessThanUInt32(null)), 
                TypeCode.UInt64 => s_liftedToNullUInt64 ?? (s_liftedToNullUInt64 = new LessThanUInt64(null)), 
                TypeCode.Single => s_liftedToNullSingle ?? (s_liftedToNullSingle = new LessThanSingle(null)), 
                TypeCode.Double => s_liftedToNullDouble ?? (s_liftedToNullDouble = new LessThanDouble(null)), 
                _ => throw ContractUtils.Unreachable, 
            };
        }
        return type.GetNonNullableType().GetTypeCode() switch
        {
            TypeCode.SByte => s_SByte ?? (s_SByte = new LessThanSByte(Utils.BoxedFalse)), 
            TypeCode.Int16 => s_Int16 ?? (s_Int16 = new LessThanInt16(Utils.BoxedFalse)), 
            TypeCode.Char => s_Char ?? (s_Char = new LessThanChar(Utils.BoxedFalse)), 
            TypeCode.Int32 => s_Int32 ?? (s_Int32 = new LessThanInt32(Utils.BoxedFalse)), 
            TypeCode.Int64 => s_Int64 ?? (s_Int64 = new LessThanInt64(Utils.BoxedFalse)), 
            TypeCode.Byte => s_Byte ?? (s_Byte = new LessThanByte(Utils.BoxedFalse)), 
            TypeCode.UInt16 => s_UInt16 ?? (s_UInt16 = new LessThanUInt16(Utils.BoxedFalse)), 
            TypeCode.UInt32 => s_UInt32 ?? (s_UInt32 = new LessThanUInt32(Utils.BoxedFalse)), 
            TypeCode.UInt64 => s_UInt64 ?? (s_UInt64 = new LessThanUInt64(Utils.BoxedFalse)), 
            TypeCode.Single => s_Single ?? (s_Single = new LessThanSingle(Utils.BoxedFalse)), 
            TypeCode.Double => s_Double ?? (s_Double = new LessThanDouble(Utils.BoxedFalse)), 
            _ => throw ContractUtils.Unreachable, 
        };
    }
}