From 68ab62057be28c07d836231a269847cfb7d89fcf Mon Sep 17 00:00:00 2001
From: Anairkoen Schno <aaron.cirr.com@gmail.com>
Date: Sun, 23 Sep 2018 13:56:38 -0500
Subject: [PATCH] Completely moved virtualization to the loader

---
 Doorstop                         |   2 +-
 IPA.Injector/IPA.Injector.csproj |   1 +
 IPA.Injector/Injector.cs         |   9 +++
 IPA.Injector/Virtualizer.cs      | 118 +++++++++++++++++++++++++++++++
 IPA/Program.cs                   |   2 +-
 5 files changed, 130 insertions(+), 2 deletions(-)
 create mode 100644 IPA.Injector/Virtualizer.cs

diff --git a/Doorstop b/Doorstop
index c5072722..52dae348 160000
--- a/Doorstop
+++ b/Doorstop
@@ -1 +1 @@
-Subproject commit c5072722ea34f4c45a5f1fcabb3d9a46d1bf5eb4
+Subproject commit 52dae348cf4355cf9687a32aa90e5bcdfc102b11
diff --git a/IPA.Injector/IPA.Injector.csproj b/IPA.Injector/IPA.Injector.csproj
index 2bd2e7a5..1d6aa1f2 100644
--- a/IPA.Injector/IPA.Injector.csproj
+++ b/IPA.Injector/IPA.Injector.csproj
@@ -56,6 +56,7 @@
     <Compile Include="Injector.cs" />
     <Compile Include="LibLoader.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Virtualizer.cs" />
     <Compile Include="WtfThisDoesntNeedToExist.cs" />
   </ItemGroup>
   <ItemGroup>
diff --git a/IPA.Injector/Injector.cs b/IPA.Injector/Injector.cs
index fbe8a451..c6ae0eb3 100644
--- a/IPA.Injector/Injector.cs
+++ b/IPA.Injector/Injector.cs
@@ -50,6 +50,7 @@ namespace IPA.Injector
         {
             var cAsmName = Assembly.GetExecutingAssembly().GetName();
 
+            loader.Debug("Ensuring patch on UnityEngine.CoreModule exists");
             #region Insert patch into UnityEngine.CoreModule.dll
             var unityPath = Path.Combine(Environment.CurrentDirectory, "Beat Saber_Data", "Managed", "UnityEngine.CoreModule.dll");
 
@@ -110,6 +111,14 @@ namespace IPA.Injector
             if (modified)
                 unityAsmDef.Write(unityPath);
             #endregion
+
+            loader.Debug("Ensuring Assembly-CSharp is virtualized");
+            #region Virtualize Assembly-CSharp.dll
+            var ascPath = Path.Combine(Environment.CurrentDirectory, "Beat Saber_Data", "Managed", "Assembly-CSharp.dll");
+
+            var ascModule = VirtualizedModule.Load(ascPath);
+            ascModule.Virtualize(cAsmName);
+            #endregion
         }
 
         private static bool bootstrapped = false;
diff --git a/IPA.Injector/Virtualizer.cs b/IPA.Injector/Virtualizer.cs
new file mode 100644
index 00000000..d80c65dc
--- /dev/null
+++ b/IPA.Injector/Virtualizer.cs
@@ -0,0 +1,118 @@
+using Mono.Cecil;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+
+namespace IPA.Injector
+{
+    internal class VirtualizedModule
+    {
+        private const string ENTRY_TYPE = "Display";
+
+        public FileInfo file;
+        public ModuleDefinition module;
+
+        public static VirtualizedModule Load(string engineFile)
+        {
+            return new VirtualizedModule(engineFile);
+        }
+
+        private VirtualizedModule(string assemblyFile)
+        {
+            file = new FileInfo(assemblyFile);
+
+            LoadModules();
+        }
+
+        private void LoadModules()
+        {
+            module = ModuleDefinition.ReadModule(file.FullName);
+        }
+        
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="module"></param>
+        public void Virtualize(AssemblyName selfName)
+        {
+            bool changed = false;
+            bool virtualize = true;
+            foreach (var r in module.AssemblyReferences)
+            {
+                if (r.Name == selfName.Name)
+                {
+                    virtualize = false;
+                    if (r.Version != selfName.Version)
+                    {
+                        r.Version = selfName.Version;
+                        changed = true;
+                    }
+                }
+            }
+
+            if (virtualize)
+            {
+                changed = true;
+                module.AssemblyReferences.Add(new AssemblyNameReference(selfName.Name, selfName.Version));
+
+                foreach (var type in module.Types)
+                {
+                    VirtualizeType(type);
+                }
+            }
+
+            if (changed)
+                module.Write(file.FullName);
+        }
+
+        private void VirtualizeType(TypeDefinition type)
+        {
+            if(type.IsSealed)
+            {
+                // Unseal
+                type.IsSealed = false;
+            }
+
+            if (type.IsInterface) return;
+            if (type.IsAbstract) return;
+
+            // These two don't seem to work.
+            if (type.Name == "SceneControl" || type.Name == "ConfigUI") return;
+            
+            // Take care of sub types
+            foreach (var subType in type.NestedTypes)
+            {
+                VirtualizeType(subType);
+            }
+
+            foreach (var method in type.Methods)
+            {
+                if (method.IsManaged
+                    && method.IsIL
+                    && !method.IsStatic
+                    && !method.IsVirtual
+                    && !method.IsAbstract
+                    && !method.IsAddOn
+                    && !method.IsConstructor
+                    && !method.IsSpecialName
+                    && !method.IsGenericInstance
+                    && !method.HasOverrides)
+                {
+                    method.IsVirtual = true;
+                    method.IsPublic = true;
+                    method.IsPrivate = false;
+                    method.IsNewSlot = true;
+                    method.IsHideBySig = true;
+                }
+            }
+
+            foreach (var field in type.Fields)
+            {
+                if (field.IsPrivate) field.IsFamily = true;
+            }
+        }
+    }
+}
diff --git a/IPA/Program.cs b/IPA/Program.cs
index 6175b757..415c0511 100644
--- a/IPA/Program.cs
+++ b/IPA/Program.cs
@@ -270,7 +270,7 @@ namespace IPA
 
                 #region Virtualizing
 
-                if (File.Exists(context.AssemblyFile))
+                if (ArgDestructive && File.Exists(context.AssemblyFile))
                 {
                     var virtualizedModule = VirtualizedModule.Load(context.AssemblyFile);
                     if (!virtualizedModule.IsVirtualized)