Client/GameClient/Assets/Game/Launcher/HotUpdateProxy/HotUpdateCodeLoader.cs

using System;
using System.Collections;
using System.Reflection;
using UnityEngine;
using GFGGame.Launcher;
using System.Collections.Generic;
using HybridCLR;
using System.Linq;

namespace GFGGame
{
    public class HotUpdateCodeLoader : SingletonMonoBase<HotUpdateCodeLoader>
    {

        public static List<string> AOTMetaAssemblyNames { get; } = new List<string>()
        {
            "mscorlib.dll",
            "System.dll",
            "System.Core.dll",
        };

        public Type[] allTypes;

        public Type[] GetTypes()
        {
            return this.allTypes;
        }

        public void StartLoad()
        {

#if !UNITY_EDITOR
            LoadMetadataForAOTAssemblies();
            StartCoroutine(StartLoadAssemblyHotfix());
#else
            var gameAss = AppDomain.CurrentDomain.GetAssemblies().First(assembly => assembly.GetName().Name == "Game.HotUpdate");
            LoadAssemblyJustInTime(gameAss);
#endif

        }


        IEnumerator StartLoadAssemblyHotfix()
        {
            LogServerHelperHttp.SendNodeLog((int)LogNode.StartLoadGameDll);
            //ET.Log.Debug("ILRuntimeLauncher StartLoadAssemblyHotfix");
            yield return new WaitForSeconds(0.1f);
            var dllPath = $"{LauncherConfig.DllDirHotfix}Game.HotUpdate.dll.bytes";
            var asset = GFGAsset.Load<TextAsset>(dllPath);
            byte[] assBytes = asset.bytes;
            var assembly = Assembly.Load(assBytes);
            LoadAssemblyJustInTime(assembly);
            GFGAsset.Release(dllPath);
        }

        void LoadAssemblyJustInTime(Assembly assembly)
        {
            //mono模式
            this.allTypes = assembly.GetTypes();
            System.Type type = assembly.GetType("GFGGame.HotUpdate.HotUpdateEntry");
            var method = type.GetMethod("Start");
            var startDel = (Action)System.Delegate.CreateDelegate(typeof(Action), null, method);
            startDel();
        }

        /// <summary>
        /// 为aot assembly加载原始metadata， 这个代码放aot或者热更新都行。
        /// 一旦加载后，如果AOT泛型函数对应native实现不存在，则自动替换为解释模式执行
        /// </summary>
        private void LoadMetadataForAOTAssemblies()
        {
            // 可以加载任意aot assembly的对应的dll。但要求dll必须与unity build过程中生成的裁剪后的dll一致，而不能直接使用原始dll。
            // 我们在BuildProcessors里添加了处理代码，这些裁剪后的dll在打包时自动被复制到 {项目目录}/HybridCLRData/AssembliesPostIl2CppStrip/{Target} 目录。

            /// 注意，补充元数据是给AOT dll补充元数据，而不是给热更新dll补充元数据。
            /// 热更新dll不缺元数据，不需要补充，如果调用LoadMetadataForAOTAssembly会返回错误
            /// 
            HomologousImageMode mode = HomologousImageMode.SuperSet;
            foreach (var aotDllName in AOTMetaAssemblyNames)
            {
                var dllPath = $"{LauncherConfig.DllDirAOT}{aotDllName}.bytes";
                var asset = GFGAsset.Load<TextAsset>(dllPath);
                byte[] dllBytes = asset.bytes;
                // 加载assembly对应的dll，会自动为它hook。一旦aot泛型函数的native函数不存在，用解释器版本代码
                LoadImageErrorCode err = RuntimeApi.LoadMetadataForAOTAssembly(dllBytes, mode);
                Debug.Log($"LoadMetadataForAOTAssembly:{aotDllName}. mode:{mode} ret:{err}");
            }
        }
    }
}