OpCode.cs

Go to the documentation of this file.

using System.Diagnostics.CodeAnalysis;
using System.Threading;
 
namespace System.Reflection.Emit;
 
public readonly struct OpCode : IEquatable<OpCode>
{
    private readonly OpCodeValues m_value;
 
    private readonly int m_flags;
 
    private static volatile string[] g_nameCache;
 
    public OperandType OperandType => (OperandType)(m_flags & 0x1F);
 
    public FlowControl FlowControl => (FlowControl)((m_flags >> 5) & 0xF);
 
    public OpCodeType OpCodeType => (OpCodeType)((m_flags >> 9) & 7);
 
    public StackBehaviour StackBehaviourPop => (StackBehaviour)((m_flags >> 12) & 0x1F);
 
    public StackBehaviour StackBehaviourPush => (StackBehaviour)((m_flags >> 17) & 0x1F);
 
    public int Size => (m_flags >> 22) & 3;
 
    public short Value => (short)m_value;
 
    public string? Name
    {
        get
        {
            if (Size == 0)
            {
                return null;
            }
            string[] array = g_nameCache;
            if (array == null)
            {
                array = (g_nameCache = new string[287]);
            }
            OpCodeValues opCodeValues = (OpCodeValues)(ushort)Value;
            int num = (int)opCodeValues;
            if (num > 255)
            {
                if (num < 65024 || num > 65054)
                {
                    return null;
                }
                num = 256 + (num - 65024);
            }
            string text = Volatile.Read(ref array[num]);
            if (text != null)
            {
                return text;
            }
            text = Enum.GetName(typeof(OpCodeValues), opCodeValues).ToLowerInvariant().Replace('_', '.');
            Volatile.Write(ref array[num], text);
            return text;
        }
    }
 
    internal OpCode(OpCodeValues value, int flags)
    {
        m_value = value;
        m_flags = flags;
    }
 
    internal bool EndsUncondJmpBlk()
    {
        return (m_flags & 0x1000000) != 0;
    }
 
    internal int StackChange()
    {
        return m_flags >> 28;
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        if (obj is OpCode obj2)
        {
            return Equals(obj2);
        }
        return false;
    }
 
    public bool Equals(OpCode obj)
    {
        return obj.Value == Value;
    }
 
    public static bool operator ==(OpCode a, OpCode b)
    {
        return a.Equals(b);
    }
 
    public static bool operator !=(OpCode a, OpCode b)
    {
        return !(a == b);
    }
 
    public override int GetHashCode()
    {
        return Value;
    }
 
    public override string? ToString()
    {
        return Name;
    }
}