Instruction.cs

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using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Xml.Linq;
 
using IKVM.Runtime;
 
namespace IKVM.Tools.Importer.MapXml
{
 
    public abstract class Instruction : MapXmlElement
    {
 
        static readonly Dictionary<XName, MethodInfo> readMethodsByName;
 
        static Instruction()
        {
            readMethodsByName = typeof(Instruction).Assembly.GetTypes()
                .Where(i => i.IsSubclassOf(typeof(Instruction)))
                .Where(i => i.GetCustomAttribute<InstructionAttribute>() is InstructionAttribute ia)
                .Select(i => new { ElementName = MapXmlSerializer.NS + i.GetCustomAttribute<InstructionAttribute>().ElementName, Type = i })
                .Select(i => new { i.ElementName, Method = i.Type.GetMethod("Read", BindingFlags.Public | BindingFlags.Static) })
                .ToDictionary(i => i.ElementName, i => i.Method);
        }
 
        public static Instruction Read(XElement element)
        {
            if (readMethodsByName.TryGetValue(element.Name, out var m) == false)
                throw new MapXmlException($"Could not find instruction type for '{element.Name}'.");
 
            return (Instruction)m.Invoke(null, new[] { element });
        }
 
        internal abstract void Generate(CodeGenContext context, CodeEmitter ilgen);
 
    }
 
}