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- using System;
- using System.Reflection;
- using System.Reflection.Emit;
- using System.Linq.Expressions;
-
- namespace Svelto.Utilities
- {
- //https://stackoverflow.com/questions/321650/how-do-i-set-a-field-value-in-an-c-sharp-expression-tree/321686#321686
-
- public static class FastInvoke<T> where T : class
- {
- #if ENABLE_IL2CPP
- public static Action<CastedType, object> MakeSetter<CastedType>(FieldInfo field)
- {
- if (field.FieldType.IsInterface == true && field.FieldType.IsValueType == false)
- {
- return new Action<CastedType, object>((target, value) => field.SetValue(target, value));
- }
-
- throw new ArgumentException("<color=orange>Svelto.ECS</color> unsupported EntityView field (must be an interface and a class)");
- }
- #elif !NETFX_CORE
- public static Action<CastedType, object> MakeSetter<CastedType>(FieldInfo field)
- {
- if (field.FieldType.IsInterfaceEx() == true && field.FieldType.IsValueTypeEx() == false)
- {
- DynamicMethod m = new DynamicMethod("setter", typeof(void), new Type[] { typeof(T), typeof(object) });
- ILGenerator cg = m.GetILGenerator();
-
- // arg0.<field> = arg1
- cg.Emit(OpCodes.Ldarg_0);
- cg.Emit(OpCodes.Ldarg_1);
- cg.Emit(OpCodes.Stfld, field);
- cg.Emit(OpCodes.Ret);
-
- return new Action<CastedType, object>((target, value) => m.CreateDelegate(typeof(Action<T, object>)).DynamicInvoke(target, value));
- }
-
- throw new ArgumentException("<color=orange>Svelto.ECS</color> unsupported EntityView field (must be an interface and a class)");
- }
- #else
- public static Action<CastedType, object> MakeSetter<CastedType>(FieldInfo field)
- {
- if (field.FieldType.IsInterfaceEx() == true && field.FieldType.IsValueTypeEx() == false)
- {
- ParameterExpression targetExp = Expression.Parameter(typeof(T), "target");
- ParameterExpression valueExp = Expression.Parameter(field.FieldType, "value");
-
- MemberExpression fieldExp = Expression.Field(targetExp, field);
- BinaryExpression assignExp = Expression.Assign(fieldExp, valueExp);
-
- var setter = Expression.Lambda(assignExp, targetExp, valueExp).Compile();
-
- return new Action<CastedType, object>((target, value) => setter.DynamicInvoke(target, value));
- }
-
- throw new ArgumentException("<color=orange>Svelto.ECS</color> unsupported EntityView field (must be an interface and a class)");
- }
- #endif
- }
- }
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