/// <summary>
/// Preloads the dynamic method used to retrieve the value of the wrapped <see cref="FieldInfo"/> instance
/// </summary>
public void BuildDynamicGetter()
{
// Create a new dynamic method
FieldInfo[] hierarchy = Parents.Append(Info).ToArray();
Type ownerType = hierarchy[0].DeclaringType;
DynamicMethod method = new DynamicMethod(
$"Get{Info.Name}",
typeof(object), // The return type
new[] { typeof(object) }, // A single object parameter
ownerType); // The type that will own the new method
// Load and cast the argument
ILGenerator il = method.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Castclass, ownerType);
// Unroll the depth traversal until the last parent
foreach (FieldInfo parent in Parents)
{
il.Emit(OpCodes.Ldfld, parent);
}
// Get and box the target field
il.Emit(OpCodes.Ldfld, Info);
if (Info.FieldType.IsValueType)
{
il.Emit(OpCodes.Box, Info.FieldType);
}
il.Emit(OpCodes.Ret);
// Create the proper delegate type for the method
Getter = (Func <object, object>)method.CreateDelegate(typeof(Func <object, object>));
}
