Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

external/linker/tuner/Mono.Tuner/RemoveAttributesBase.cs

@@ -0,0 +1,103 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+
+using Mono.Linker;
+using Mono.Linker.Steps;
+
+using Mono.Tuner;
+
+using Mono.Cecil;
+
+namespace Mono.Tuner {
+
+	public abstract class RemoveAttributesBase : BaseSubStep {
+
+		public override SubStepTargets Targets {
+			get {
+				return SubStepTargets.Assembly
+					| SubStepTargets.Type
+					| SubStepTargets.Field
+					| SubStepTargets.Method
+					| SubStepTargets.Property
+					| SubStepTargets.Event;
+			}
+		}
+
+		public override bool IsActiveFor (AssemblyDefinition assembly)
+		{
+			return Annotations.GetAction (assembly) == AssemblyAction.Link;
+		}
+
+		public override void ProcessAssembly (AssemblyDefinition assembly)
+		{
+			ProcessAttributeProvider (assembly);
+			ProcessAttributeProvider (assembly.MainModule);
+		}
+
+		public override void ProcessType (TypeDefinition type)
+		{
+			ProcessAttributeProvider (type);
+
+			if (type.HasGenericParameters)
+				ProcessAttributeProviderCollection (type.GenericParameters);
+		}
+
+		void ProcessAttributeProviderCollection (IList list)
+		{
+			for (int i = 0; i < list.Count; i++)
+				ProcessAttributeProvider ((ICustomAttributeProvider) list [i]);
+		}
+
+		public override void ProcessField (FieldDefinition field)
+		{
+			ProcessAttributeProvider (field);
+		}
+
+		public override void ProcessMethod (MethodDefinition method)
+		{
+			ProcessMethodAttributeProvider (method);
+		}
+
+		void ProcessMethodAttributeProvider (MethodDefinition method)
+		{
+			ProcessAttributeProvider (method);
+			ProcessAttributeProvider (method.MethodReturnType);
+
+			if (method.HasParameters)
+				ProcessAttributeProviderCollection (method.Parameters);
+
+			if (method.HasGenericParameters)
+				ProcessAttributeProviderCollection (method.GenericParameters);
+		}
+
+		public override void ProcessProperty (PropertyDefinition property)
+		{
+			ProcessAttributeProvider (property);
+		}
+
+		public override void ProcessEvent (EventDefinition @event)
+		{
+			ProcessAttributeProvider (@event);
+		}
+
+		void ProcessAttributeProvider (ICustomAttributeProvider provider)
+		{
+			if (!provider.HasCustomAttributes)
+				return;
+
+			for (int i = 0; i < provider.CustomAttributes.Count; i++) {
+				var attrib = provider.CustomAttributes [i];
+				if (!IsRemovedAttribute (attrib))
+					continue;
+
+				WillRemoveAttribute (provider, attrib);
+				provider.CustomAttributes.RemoveAt (i--);
+			}
+		}
+
+		protected abstract bool IsRemovedAttribute (CustomAttribute attribute);
+		protected virtual void WillRemoveAttribute (ICustomAttributeProvider provider, CustomAttribute attribute) { }
+	}
+}