private static SerializationFactory CreateFactory(Type t)
{
var fields = DeepEquality.GetAllFields(t)
//.OrderBy(fi => (int)fi.GetManagedOffset()) // [StructLayout.Sequential] doesn't work with this
.OrderBy(fi => (int)Marshal.OffsetOf(t, fi.Name))
.ToList();
var rmeth = new DynamicMethod(t.Name + "_r", null, new[] { typeof(object), typeof(BinaryReader) }, true);
var wmeth = new DynamicMethod(t.Name + "_w", null, new[] { typeof(object), typeof(BinaryWriter) }, true);
{
var il = rmeth.GetILGenerator();
var target = il.DeclareLocal(t);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Castclass, t);
il.Emit(OpCodes.Stloc, target);
foreach (var field in fields)
{
il.Emit(OpCodes.Ldloc, target);
il.Emit(OpCodes.Ldarg_1);
MethodInfo m;
if (!readhandlers.TryGetValue(field.FieldType, out m))
{
throw new InvalidOperationException("(R) Can't handle nested type " + field.FieldType);
}
il.Emit(OpCodes.Callvirt, m);
il.Emit(OpCodes.Stfld, field);
}
il.Emit(OpCodes.Ret);
}
{
var il = wmeth.GetILGenerator();
var target = il.DeclareLocal(t);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Castclass, t);
il.Emit(OpCodes.Stloc, target);
foreach (var field in fields)
{
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Ldloc, target);
il.Emit(OpCodes.Ldfld, field);
MethodInfo m;
if (!writehandlers.TryGetValue(field.FieldType, out m))
{
throw new InvalidOperationException("(W) Can't handle nested type " + field.FieldType);
}
il.Emit(OpCodes.Callvirt, m);
}
il.Emit(OpCodes.Ret);
}
return(new SerializationFactory
{
Type = t,
Read = (Reader)rmeth.CreateDelegate(typeof(Reader)),
Write = (Writer)wmeth.CreateDelegate(typeof(Writer))
});
}
