strip-methods.cs

[PostProcessBuild]
public static void OnPostProcessBuild(BuildTarget buildTarget, string pathToBuildProject)
{
    if (buildTarget != BuildTarget.iOS)
        return;
        
    StripMethods(pathToBuiltProject);
}

private static string[] s_stripList =
{
    // Strip some unused Unity methods.
    "UnityWebRequest_",
    "Collision_",
    "Collision2D_",
    "Physics_",
    "Physics2D_",
    
    // Strip some unused .NET class library methods.
    "FtpWebRequest_",
    "FtpWebResponse_",
    "FileWebRequest_"
    "X509",
    "BigInteger_"
};

private static void StripMethods(string pathToBuiltProject)
{
    var methodPointerTable = Path.Combine(pathToBuiltProject,
        "Classes/Native/Il2CppMethodPointerTable.cpp");
    var lines = File.ReadAllLines(methodPointerTable);
    var inMethodPointerTable = false;
    for (var i = 0; i < lines.Length; i++)
    {
        var line = lines[i];
        if (line.StartsWith("extern const Il2CppMethodPointer g_MethodPointers"))
        {
            inMethodPointerTable = true;
            // Skip the opening brace.
            i++;
        }
        else if (inMethodPointerTable)
        {
            if (line.StartsWith("};"))
            {
                // Finished parsing the method pointer table!
                inMethodPointerTable = false;
            }
            else
            {
                lines[i] = PatchLine(line);
            }
        }
    }

    File.WriteAllLines(methodPointerTable, lines);
}

private static string PatchLine(string line)
{
    var trimmed = line.Trim();
    foreach (var s in s_stripList)
    {
        if (trimmed.StartsWith(s))
        {
            line = "\t0, //" + line;
            return line;
        }
    }

    return line;
}