DLL: Allow suppression of metadata attributes

Il2CppInspector.CLI/Program.cs

@@ -85,6 +85,9 @@ namespace Il2CppInspector.CLI
             [Option('n', "suppress-metadata", Required = false, HelpText = "Diff tidying: suppress method pointers, field offsets and type indices from C# output. Useful for comparing two versions of a binary for changes with a diff tool")]
             public bool SuppressMetadata { get; set; }
 
+            [Option("suppress-dll-metadata", Required = false, HelpText = "Diff tidying: suppress method pointers, field offsets and type indices attributes from DLL output. Useful for comparing two versions of a binary for changes")]
+            public bool SuppressDllMetadata { get; set; }
+
             [Option('k', "must-compile", Required = false, HelpText = "Compilation tidying: try really hard to make code that compiles. Suppress generation of code for items with CompilerGenerated attribute. Comment out attributes without parameterless constructors or all-optional constructor arguments. Don't emit add/remove/raise on events. Specify AttributeTargets.All on classes with AttributeUsage attribute. Force auto-properties to have get accessors. Force regular properties to have bodies. Suppress global::Locale classes. Generate dummy parameterless base constructors and ref return fields.")]
             public bool MustCompile { get; set; }
 
@@ -427,7 +430,10 @@ namespace Il2CppInspector.CLI
 
                 // DLL output
                 using (new Benchmark("Generate .NET assembly shim DLLs"))
-                    new AssemblyShims(model).Write(getOutputPath(options.DllOutPath, "", imageIndex));
+                    new AssemblyShims(model) {
+                        SuppressMetadata = options.SuppressDllMetadata
+                    }
+                    .Write(getOutputPath(options.DllOutPath, "", imageIndex));
 
                 imageIndex++;
             }

Il2CppInspector.Common/Outputs/AssemblyShims.cs

@@ -36,6 +36,11 @@ namespace Il2CppInspector.Outputs
         // Add custom attribute to item with named property arguments
         // 'module' is the module that owns 'type'; type.Module may still be null when this is called
         public static CustomAttribute AddAttribute(this IHasCustomAttribute def, ModuleDef module, TypeDef attrTypeDef, params (string prop, object value)[] args) {
+
+            // If SuppressMetadata is set, our own attributes will never be generated so attrTypeDef will be null
+            if (attrTypeDef == null)
+                return null;
+
             var attRef = module.Import(attrTypeDef);
             var attCtorRef = new MemberRefUser(attrTypeDef.Module, ".ctor", MethodSig.CreateInstance(module.CorLibTypes.Void), attRef);
 
@@ -53,6 +58,9 @@ namespace Il2CppInspector.Outputs
     // Output module to create .NET DLLs containing type definitions
     public class AssemblyShims
     {
+        // Suppress informational attributes
+        public bool SuppressMetadata { get; set; }
+
         // .NET type model
         private readonly TypeModel model;
 
@@ -502,10 +510,12 @@ namespace Il2CppInspector.Outputs
             }
 
             // Generate our custom types assembly (relies on mscorlib.dll being added above)
-            var baseDll = CreateBaseAssembly();
+            if (!SuppressMetadata) {
+                var baseDll = CreateBaseAssembly();
 
-            // Write base assembly to disk
-            baseDll.Write(Path.Combine(outputPath, baseDll.Name));
+                // Write base assembly to disk
+                baseDll.Write(Path.Combine(outputPath, baseDll.Name));
+            }
 
             // Add assembly custom attribute attributes (must do this after all assemblies are created due to type referencing)
             foreach (var asm in model.Assemblies) {

Il2CppInspector.GUI/MainWindow.xaml

@@ -350,7 +350,8 @@
 
                         <!-- Assembly shim DLLs -->
                         <RadioButton GroupName="grpOutputType" Name="rdoOutputDll" VerticalContentAlignment="Center" FontSize="18" Foreground="{StaticResource MicrosoftGreen}">.NET assembly shim DLLs</RadioButton>
-                        <TextBlock TextWrapping="WrapWithOverflow">No configuration required for assembly shims</TextBlock>
+
+                        <CheckBox Name="cbSuppressDllMetadata" Margin="2,10,2,2">Suppress output of all metadata attributes</CheckBox>
 
                         <Separator Margin="5,15,5,15"/>
 

Il2CppInspector.GUI/MainWindow.xaml.cs

@@ -612,11 +612,15 @@ namespace Il2CppInspectorGUI
                         return;
 
                     var dllOutPath = dllSaveFolderDialog.SelectedPath;
+                    var suppressMetadata = cbSuppressDllMetadata.IsChecked == true;
 
                     areaBusyIndicator.Visibility = Visibility.Visible;
                     await Task.Run(() => {
                         OnStatusUpdate(this, "Generating .NET assembly shim DLLs");
-                        new AssemblyShims(model.TypeModel).Write(dllOutPath, OnStatusUpdate);
+                        new AssemblyShims(model.TypeModel) {
+                            SuppressMetadata = suppressMetadata
+                        }
+                        .Write(dllOutPath, OnStatusUpdate);
                     });
                     break;
             }