private static void CreateMethod(AmObjectClassBuildingContext context, IAmBindingDescription bindingDesc, MethodInfo method)
{
var methodBuilder = context.TypeBuilder.DefineMethod(method.Name,
MethodAttributes.Public | MethodAttributes.Final | MethodAttributes.HideBySig |
MethodAttributes.NewSlot | MethodAttributes.Virtual);
methodBuilder.SetParameters(method.GetParameters().Select(x => x.ParameterType).ToArray());
methodBuilder.SetReturnType(method.ReturnType);
methodBuilder.SetImplementationFlags(MethodImplAttributes.Managed);
var il = new CilEmitterSugar(methodBuilder.GetILGenerator());
var field = context.Fields.GetOrAddBindingField(bindingDesc);
if (method.Name.StartsWith("get_"))
{
il.Ldarg(0);
il.Ldfld(field);
il.Call(bindingDesc.MakePropertyGetMethod(context.AmClass));
il.Ret();
}
else if (method.Name.StartsWith("set_"))
{
il.Ldarg(0);
il.Ldfld(field);
il.Ldarg(1);
il.Call(bindingDesc.MakePropertySetMethod(context.AmClass));
il.Ret();
}
else
{
throw new Exception($"Either getter or setter expected, but '{method.Name}' found.");
}
context.TypeBuilder.DefineMethodOverride(methodBuilder, method);
}
private void CreateInitBindingsMethod(AmObjectClassBuildingContext context)
{
var methodBuilder = context.TypeBuilder.DefineMethod("AmInitBindings", MethodAttributes.Public | MethodAttributes.Virtual);
methodBuilder.SetParameters(Type.EmptyTypes);
methodBuilder.SetReturnType(typeof(List <IAmBinding>));
methodBuilder.SetImplementationFlags(MethodImplAttributes.Managed);
var il = new CilEmitterSugar(methodBuilder.GetILGenerator());
var varList = il.DeclareLocal(typeof(List <IAmBinding>));
il.Newobj(typeof(List <IAmBinding>).GetConstructor(Type.EmptyTypes));
il.Stloc(varList);
foreach (var bindingDesc in context.Desc.Bindings)
{
var field = context.Fields.GetOrAddBindingField(bindingDesc);
il.Ldarg(0); // [this]
il.Dup(); // [this, this]
il.Ldstr(bindingDesc.Property.Name); // [this, this, propName]
il.Ldc_I4((int)bindingDesc.Flags); // [this, this, propName, flags]
var bindingCtor = field.FieldType.GetConstructors().Single();
il.Newobj(bindingCtor); // [this, binding]
il.Stfld(field); // []
il.Ldloc(varList); // [list]
il.Ldarg(0); // [list, this]
il.Ldfld(field); // [list, binding]
var addMethod = typeof(List <IAmBinding>).GetMethod(nameof(List <IAmBinding> .Add));
il.Callvirt(addMethod); // []
}
il.Ldloc(varList);
il.Ret();
}
private static void CreateBindingMethods(AmObjectClassBuildingContext context, IAmBindingDescription bindingDesc)
{
CreateMethod(context, bindingDesc, bindingDesc.Property.GetMethod);
if (bindingDesc.Property.SetMethod != null)
{
CreateMethod(context, bindingDesc, bindingDesc.Property.SetMethod);
}
}
public IAmObjectInstantiator CreateObjectClass(Type objectInterface, Func <Type, object> getDefaultDependency)
{
var typeBuilder = DeclareType(objectInterface);
var context = new AmObjectClassBuildingContext(objectInterface, typeBuilder, bindingTypeDescriptors);
CreateConstructor(context);
foreach (var bindingDesc in context.Desc.Bindings)
{
CreateBindingMethods(context, bindingDesc);
}
CreateInitBindingsMethod(context);
var objectClass = typeBuilder.CreateType();
var instantiatorType = typeof(AmObjectInstantiator <>).MakeGenericType(objectClass);
return((IAmObjectInstantiator)instantiatorType.GetConstructors().Single().Invoke(new object[] { getDefaultDependency }));
}
private void CreateConstructor(AmObjectClassBuildingContext context)
{
var baseConstructor = context.AmClass.GetConstructors(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.CreateInstance | BindingFlags.Instance).Single();
var parameterTypes = baseConstructor.GetParameters().Select(x => x.ParameterType).ToArray();
var constructorBuilder = context.TypeBuilder.DefineConstructor(
MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName,
CallingConventions.Standard, parameterTypes);
var il = new CilEmitterSugar(constructorBuilder.GetILGenerator());
il.Ldarg(0); // [this]
for (int i = 0; i < parameterTypes.Length; i++)
{
il.Ldarg(i + 1);
}
il.Call(baseConstructor); // []
//il.Ldarg(0);
//il.Callvirt(typeof(IAmObject).GetMethod(nameof(IAmObject.AmOnFinalized)));
il.Ret();
}
