From f30e2f5b33ae2eb7c33d893514071136fed8dd59 Mon Sep 17 00:00:00 2001
From: walon <walon@code-philosophy.com>
Date: Fri, 12 Jan 2024 21:40:45 +0800
Subject: [PATCH] =?UTF-8?q?[new]=20=E6=96=B0=E5=A2=9E=20AOTAssemblyMetadat?=
 =?UTF-8?q?aStripper=E7=94=A8=E4=BA=8E=E5=89=94=E9=99=A4AOT=20dll=E4=B8=AD?=
 =?UTF-8?q?=E9=9D=9E=E6=B3=9B=E5=9E=8B=E5=87=BD=E6=95=B0=E5=85=83=E6=95=B0?=
 =?UTF-8?q?=E6=8D=AE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 Editor/AOT/AOTAssemblyMetadataStripper.cs     | 46 +++++++++++++++++++
 .../AOT/AOTAssemblyMetadataStripper.cs.meta   | 11 +++++
 2 files changed, 57 insertions(+)
 create mode 100644 Editor/AOT/AOTAssemblyMetadataStripper.cs
 create mode 100644 Editor/AOT/AOTAssemblyMetadataStripper.cs.meta

diff --git a/Editor/AOT/AOTAssemblyMetadataStripper.cs b/Editor/AOT/AOTAssemblyMetadataStripper.cs
new file mode 100644
index 0000000..87a76a1
--- /dev/null
+++ b/Editor/AOT/AOTAssemblyMetadataStripper.cs
@@ -0,0 +1,46 @@
+using dnlib.DotNet;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace HybridCLR.Editor.AOT
+{
+    public class AOTAssemblyMetadataStripper
+    {
+        public static byte[] Strip(byte[] assemblyBytes)
+        {
+            var mod = ModuleDefMD.Load(assemblyBytes);
+            foreach (var type in mod.GetTypes())
+            {
+                if (type.HasGenericParameters)
+                {
+                    continue;
+                }
+                foreach (var method in type.Methods)
+                {
+                    if (!method.HasBody || method.HasGenericParameters)
+                    {
+                        continue;
+                    }
+                    method.Body = null;
+                }
+            }
+            var writer = new System.IO.MemoryStream();
+            mod.Write(writer);
+            writer.Flush();
+            return writer.ToArray();
+        }
+
+        public static void Strip(string originalAssemblyPath, string strippedAssemblyPath)
+        {
+            byte[] originDllBytes = System.IO.File.ReadAllBytes(originalAssemblyPath);
+            byte[] strippedDllBytes = Strip(originDllBytes);
+            UnityEngine.Debug.Log($"aot dll:{originalAssemblyPath}, length: {originDllBytes.Length} -> {strippedDllBytes.Length}, stripping rate:{(originDllBytes.Length - strippedDllBytes.Length)/(double)originDllBytes.Length} ");
+            Directory.CreateDirectory(System.IO.Path.GetDirectoryName(strippedAssemblyPath));
+            System.IO.File.WriteAllBytes(strippedAssemblyPath, strippedDllBytes);
+        }
+    }
+}
diff --git a/Editor/AOT/AOTAssemblyMetadataStripper.cs.meta b/Editor/AOT/AOTAssemblyMetadataStripper.cs.meta
new file mode 100644
index 0000000..f7642f9
--- /dev/null
+++ b/Editor/AOT/AOTAssemblyMetadataStripper.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 7e9e6a048682dcb4fab806251411f29f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: