Simplify adding a parameter and support either string/Utf8String (#164)

Author: ds5678

Il2CppInterop.Generator/Extensions/AsmResolverExtensions.cs

@@ -63,12 +63,11 @@ private static Parameter GetArgument(this ILProcessor instructions, int argument
 
     public static Parameter AddParameter(this MethodDefinition method, TypeSignature parameterSignature, string parameterName, ParameterAttributes parameterAttributes = default)
     {
-        var parameterDefinition = new ParameterDefinition((ushort)(method.Signature!.ParameterTypes.Count + 1), parameterName, parameterAttributes);
-        method.Signature.ParameterTypes.Add(parameterSignature);
-        method.ParameterDefinitions.Add(parameterDefinition);
-
-        method.Parameters.PullUpdatesFromMethodSignature();
-        return method.Parameters.Single(parameter => parameter.Name == parameterName && parameter.ParameterType == parameterSignature);
+        var parameter = method.AddParameter(parameterSignature);
+        var parameterDefinition = parameter.GetOrCreateDefinition();
+        parameterDefinition.Name = parameterName;
+        parameterDefinition.Attributes = parameterAttributes;
+        return parameter;
     }
 
     public static Parameter AddParameter(this MethodDefinition method, TypeSignature parameterSignature)

Il2CppInterop.Generator/Extensions/CustomAttributeEx.cs

@@ -1,5 +1,6 @@
 using AsmResolver;
 using AsmResolver.DotNet;
+using AsmResolver.DotNet.Signatures;
 
 namespace Il2CppInterop.Generator.Extensions;
 
@@ -25,13 +26,18 @@ public static int ExtractFieldOffset(this IHasCustomAttribute originalField)
         return ExtractInt(originalField, "FieldOffsetAttribute", "Offset");
     }
 
+    public static string? GetElementAsString(this CustomAttributeArgument argument)
+    {
+        return argument.Element as Utf8String ?? argument.Element as string;
+    }
+
     private static string? Extract(this IHasCustomAttribute originalMethod, string attributeName,
         string parameterName)
     {
         var attribute = originalMethod.CustomAttributes.SingleOrDefault(it => it.Constructor?.DeclaringType?.Name == attributeName);
         var field = attribute?.Signature?.NamedArguments.SingleOrDefault(it => it.MemberName == parameterName);
 
-        return (Utf8String?)field?.Argument.Element;
+        return field?.Argument.GetElementAsString();
     }
 
     private static long ExtractLong(this IHasCustomAttribute originalMethod, string attributeName, string parameterName)

Il2CppInterop.Generator/Passes/Pass70GenerateProperties.cs

@@ -44,7 +44,7 @@ public static void DoPass(RewriteGlobalContext context)
                 string? defaultMemberName = null;
                 var defaultMemberAttributeAttribute = type.CustomAttributes.FirstOrDefault(it =>
                     it.AttributeType()?.Name == "AttributeAttribute" && it.Signature!.NamedArguments.Any(it =>
-                        it.MemberName == "Name" && (Utf8String?)it.Argument.Element == nameof(DefaultMemberAttribute)));
+                        it.MemberName == "Name" && it.Argument.GetElementAsString() == nameof(DefaultMemberAttribute)));
                 if (defaultMemberAttributeAttribute != null)
                 {
                     defaultMemberName = "Item";