SubInstruction.cs

Go to the documentation of this file.

using System.Dynamic.Utils;
 
namespace System.Linq.Expressions.Interpreter;
 
internal abstract class SubInstruction : Instruction
{
    private sealed class SubInt16 : SubInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            int stackIndex = frame.StackIndex;
            object[] data = frame.Data;
            object obj = data[stackIndex - 2];
            if (obj != null)
            {
                object obj2 = data[stackIndex - 1];
                data[stackIndex - 2] = ((obj2 == null) ? null : ((object)(short)((short)obj - (short)obj2)));
            }
            frame.StackIndex = stackIndex - 1;
            return 1;
        }
    }
 
    private sealed class SubInt32 : SubInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            int stackIndex = frame.StackIndex;
            object[] data = frame.Data;
            object obj = data[stackIndex - 2];
            if (obj != null)
            {
                object obj2 = data[stackIndex - 1];
                data[stackIndex - 2] = ((obj2 == null) ? null : ScriptingRuntimeHelpers.Int32ToObject((int)obj - (int)obj2));
            }
            frame.StackIndex = stackIndex - 1;
            return 1;
        }
    }
 
    private sealed class SubInt64 : SubInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            int stackIndex = frame.StackIndex;
            object[] data = frame.Data;
            object obj = data[stackIndex - 2];
            if (obj != null)
            {
                object obj2 = data[stackIndex - 1];
                data[stackIndex - 2] = ((obj2 == null) ? null : ((object)((long)obj - (long)obj2)));
            }
            frame.StackIndex = stackIndex - 1;
            return 1;
        }
    }
 
    private sealed class SubUInt16 : SubInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            int stackIndex = frame.StackIndex;
            object[] data = frame.Data;
            object obj = data[stackIndex - 2];
            if (obj != null)
            {
                object obj2 = data[stackIndex - 1];
                data[stackIndex - 2] = ((obj2 == null) ? null : ((object)(ushort)((ushort)obj - (ushort)obj2)));
            }
            frame.StackIndex = stackIndex - 1;
            return 1;
        }
    }
 
    private sealed class SubUInt32 : SubInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            int stackIndex = frame.StackIndex;
            object[] data = frame.Data;
            object obj = data[stackIndex - 2];
            if (obj != null)
            {
                object obj2 = data[stackIndex - 1];
                data[stackIndex - 2] = ((obj2 == null) ? null : ((object)((uint)obj - (uint)obj2)));
            }
            frame.StackIndex = stackIndex - 1;
            return 1;
        }
    }
 
    private sealed class SubUInt64 : SubInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            int stackIndex = frame.StackIndex;
            object[] data = frame.Data;
            object obj = data[stackIndex - 2];
            if (obj != null)
            {
                object obj2 = data[stackIndex - 1];
                data[stackIndex - 2] = ((obj2 == null) ? null : ((object)((ulong)obj - (ulong)obj2)));
            }
            frame.StackIndex = stackIndex - 1;
            return 1;
        }
    }
 
    private sealed class SubSingle : SubInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            int stackIndex = frame.StackIndex;
            object[] data = frame.Data;
            object obj = data[stackIndex - 2];
            if (obj != null)
            {
                object obj2 = data[stackIndex - 1];
                data[stackIndex - 2] = ((obj2 == null) ? null : ((object)((float)obj - (float)obj2)));
            }
            frame.StackIndex = stackIndex - 1;
            return 1;
        }
    }
 
    private sealed class SubDouble : SubInstruction
    {
        public override int Run(InterpretedFrame frame)
        {
            int stackIndex = frame.StackIndex;
            object[] data = frame.Data;
            object obj = data[stackIndex - 2];
            if (obj != null)
            {
                object obj2 = data[stackIndex - 1];
                data[stackIndex - 2] = ((obj2 == null) ? null : ((object)((double)obj - (double)obj2)));
            }
            frame.StackIndex = stackIndex - 1;
            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 => 2;
 
    public override int ProducedStack => 1;
 
    public override string InstructionName => "Sub";
 
    private SubInstruction()
    {
    }
 
    public static Instruction Create(Type type)
    {
        return type.GetNonNullableType().GetTypeCode() switch
        {
            TypeCode.Int16 => s_Int16 ?? (s_Int16 = new SubInt16()), 
            TypeCode.Int32 => s_Int32 ?? (s_Int32 = new SubInt32()), 
            TypeCode.Int64 => s_Int64 ?? (s_Int64 = new SubInt64()), 
            TypeCode.UInt16 => s_UInt16 ?? (s_UInt16 = new SubUInt16()), 
            TypeCode.UInt32 => s_UInt32 ?? (s_UInt32 = new SubUInt32()), 
            TypeCode.UInt64 => s_UInt64 ?? (s_UInt64 = new SubUInt64()), 
            TypeCode.Single => s_Single ?? (s_Single = new SubSingle()), 
            TypeCode.Double => s_Double ?? (s_Double = new SubDouble()), 
            _ => throw ContractUtils.Unreachable, 
        };
    }
}