private static void ImplementGetInspector(PropertyBuilderContext context, Action <PropertyBuilderContext> implement, MethodInfo getInspector)
{
// Run real implementor first
implement(context);
// Getter now has value to be returned as single element on stack
if (context.GetMethodGenerator != null)
{
// Store return value in local var
LocalBuilder returnValue = context.GetMethodGenerator.DeclareLocal(context.Property.PropertyType);
context.GetMethodGenerator.Emit(OpCodes.Stloc, returnValue);
// Call inspector(layer, PropertyInfo, value)
context.GetMethodGenerator.Emit(OpCodes.Ldarg_0);
context.GetMethodGenerator.Emit(OpCodes.Ldsfld, context.PropertyInfoField);
context.GetMethodGenerator.Emit(OpCodes.Ldloc, returnValue);
if (context.Property.PropertyType.IsValueType)
{
context.GetMethodGenerator.Emit(OpCodes.Box, context.Property.PropertyType);
}
// Allow inspector be generic in property type
getInspector = getInspector.Specialize(context.BaseClass, typeof(void), typeof(PropertyInfo), context.Property.PropertyType);
context.GetMethodGenerator.EmitCall(OpCodes.Call, getInspector, null);
// Load real return value to leave stack unchanged
context.GetMethodGenerator.Emit(OpCodes.Ldloc, returnValue);
}
}
/// <summary>
/// Implements properties using getter and setter methods
/// </summary>
/// <param name="context"></param>
/// <param name="initMethod"></param>
/// <param name="getMethod"></param>
/// <param name="setMethod"></param>
private static void ImplementGetterAndSetter(PropertyBuilderContext context, MethodInfo initMethod, MethodInfo getMethod, MethodInfo setMethod)
{
// Define field to hold info for this prop
FieldBuilder stateField = context.TypeBuilder.DefineField("__propertyState_" + context.Property.Name, initMethod.ReturnType, FieldAttributes.Private);
// Append to Init method code to call our initializer and store output in field
context.InitMethodGenerator.Emit(OpCodes.Ldarg_0);
context.InitMethodGenerator.Emit(OpCodes.Ldarg_0);
context.InitMethodGenerator.Emit(OpCodes.Ldsfld, context.PropertyInfoField);
context.InitMethodGenerator.EmitCall(OpCodes.Call, initMethod, null);
context.InitMethodGenerator.Emit(OpCodes.Stfld, stateField);
// Call getter method
if (context.GetMethodGenerator != null)
{
context.GetMethodGenerator.Emit(OpCodes.Ldarg_0);
context.GetMethodGenerator.Emit(OpCodes.Ldarg_0);
context.GetMethodGenerator.Emit(OpCodes.Ldfld, stateField);
getMethod = getMethod.Specialize(context.BaseClass, typeof(object), stateField.FieldType);
context.GetMethodGenerator.EmitCall(OpCodes.Call, getMethod, null);
if (context.Property.PropertyType.IsValueType && !getMethod.ReturnType.IsValueType)
{
context.GetMethodGenerator.Emit(OpCodes.Unbox_Any, context.Property.PropertyType);
}
else if (!context.Property.PropertyType.IsValueType && getMethod.ReturnType.IsValueType)
{
context.GetMethodGenerator.Emit(OpCodes.Box);
}
}
// Call setter method
if (context.SetMethodGenerator != null)
{
context.SetMethodGenerator.Emit(OpCodes.Ldarg_0); // Instance for handler call
context.SetMethodGenerator.Emit(OpCodes.Ldarg_0); // Instance for field
context.SetMethodGenerator.Emit(OpCodes.Ldfld, stateField); // Info field
context.SetMethodGenerator.Emit(OpCodes.Ldarg_1); // Value from set method
setMethod = setMethod.Specialize(context.BaseClass, typeof(void), stateField.FieldType, context.Property.PropertyType);
// If prop is value type but handler takes object, we must box
if (context.Property.PropertyType.IsValueType && !setMethod.GetParameters().Last().ParameterType.IsValueType)
{
context.SetMethodGenerator.Emit(OpCodes.Box, context.Property.PropertyType);
}
context.SetMethodGenerator.EmitCall(OpCodes.Call, setMethod, null);
}
}
/// <summary>
/// Implements a property using a private backing field
/// </summary>
/// <param name="context"></param>
private static void ImplementBackingField(PropertyBuilderContext context)
{
// Define field to hold info for this prop
FieldBuilder valueField = context.TypeBuilder.DefineField("__backingField_" + context.Property.Name, context.Property.PropertyType, FieldAttributes.Private);
if (context.GetMethodGenerator != null)
{
context.GetMethodGenerator.Emit(OpCodes.Ldarg_0);
context.GetMethodGenerator.Emit(OpCodes.Ldfld, valueField);
}
if (context.SetMethodGenerator != null)
{
context.SetMethodGenerator.Emit(OpCodes.Ldarg_0);
context.SetMethodGenerator.Emit(OpCodes.Ldarg_1);
context.SetMethodGenerator.Emit(OpCodes.Stfld, valueField);
}
}
private static void ImplementSetInspector(PropertyBuilderContext context, Action <PropertyBuilderContext> implement, MethodInfo preSetInspector, MethodInfo postSetInspector)
{
// Call pre set inspector
if (preSetInspector != null && context.SetMethodGenerator != null)
{
context.SetMethodGenerator.Emit(OpCodes.Ldarg_0);
context.SetMethodGenerator.Emit(OpCodes.Ldsfld, context.PropertyInfoField);
context.SetMethodGenerator.Emit(OpCodes.Ldarg_1);
preSetInspector = preSetInspector.Specialize(context.BaseClass, typeof(void), typeof(PropertyInfo), context.Property.PropertyType);
if (context.Property.PropertyType.IsValueType && !preSetInspector.GetParameters().Last().ParameterType.IsValueType)
{
context.SetMethodGenerator.Emit(OpCodes.Box, context.Property.PropertyType);
}
context.SetMethodGenerator.EmitCall(OpCodes.Call, preSetInspector, null);
}
// Run real implementor now
implement(context);
// Call post set
if (context.SetMethodGenerator != null && postSetInspector != null)
{
// Call inspector(layer, PropertyInfo, value)
context.SetMethodGenerator.Emit(OpCodes.Ldarg_0);
context.SetMethodGenerator.Emit(OpCodes.Ldsfld, context.PropertyInfoField);
context.SetMethodGenerator.Emit(OpCodes.Ldarg_1);
// Allow inspector be generic in property type
postSetInspector = postSetInspector.Specialize(context.BaseClass, typeof(void), typeof(PropertyInfo), context.Property.PropertyType);
if (context.Property.PropertyType.IsValueType && !postSetInspector.GetParameters().Last().ParameterType.IsValueType)
{
context.SetMethodGenerator.Emit(OpCodes.Box, context.Property.PropertyType);
}
context.SetMethodGenerator.EmitCall(OpCodes.Call, postSetInspector, null);
}
}
