Metadata for Injected Properties

[ds5678]

Motivation

Injected properties currently can't be (easily) used outside the pass they're created in. This prevents them from being used in other passes, such as the equality comparison pass.

Design Concept

sealed class InjectedProperty
{
	InjectedPropertyType Type { get; }
	string Name { get; }
}
abstract class InjectedPropertyType
{
	abstract TypeSignature Signature { get; }
	abstract IMethodDefOrRef EqualsMethod { get; }
	//etc
}

Other considerations

Existing properties on UnityAssetBase and UnityObjectBase may need metadata, too.

[ds5678]

internal static class PropertyInjector
{
	public static void InjectFullProperty(ClassGroupBase group, TypeSignature propertySignature, string propertyName, bool nullable)
	{
		InjectedInterfaceProperty interfaceProperty;
		{
			PropertyDefinition property = group.Interface.AddFullProperty(propertyName, InterfaceUtils.InterfacePropertyDeclaration, propertySignature);
			if (nullable)
			{
				property.AddNullableAttributesForMaybeNull();
			}
			interfaceProperty = new InjectedInterfaceProperty(property, group);
			group.InterfaceProperties.Add(interfaceProperty);
		}

		foreach (GeneratedClassInstance instance in group.Instances)
		{
			TypeDefinition type = instance.Type;
			FieldDefinition field = type.AddField(propertySignature, $"m_{propertyName}");
			PropertyDefinition property = type.ImplementFullProperty(propertyName, InterfaceUtils.InterfacePropertyImplementation, null, field);
			if (nullable)
			{
				field.AddNullableAttributesForMaybeNull();
				property.AddNullableAttributesForMaybeNull();
			}
			instance.Properties.Add(new InjectedClassProperty(property, field, interfaceProperty, instance));
		}
	}

	private sealed class InjectedInterfaceProperty : InterfaceProperty
	{
		public InjectedInterfaceProperty(PropertyDefinition definition, ClassGroupBase group) : base(definition, group)
		{
		}
		public override bool IsInjected => true;
	}
	private sealed class InjectedClassProperty : ClassProperty
	{
		public InjectedClassProperty(PropertyDefinition definition, FieldDefinition backingField, InjectedInterfaceProperty @base, GeneratedClassInstance @class) : base(definition, backingField, @base, @class)
		{
		}
		public override bool IsInjected => true;
	}
}