PostProcess assembly before Burst kicks in

Unity Engine
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1

Hello, I want to post process my assemblies, before Burst compiler kicks in, so to make some of my code Burst compatible.
I’ve subscribed to the CompilationPipeline.compilationFinished += CompilationFinished;,
then I got this handler:

var dlls = CompilationPipeline.GetAssemblies().Select(x => x.outputPath).ToArray();
            if (dlls.Length == 0)
                return;
            
            var root = CompilationPipeline.GetPrecompiledAssemblyPaths(CompilationPipeline.PrecompiledAssemblySources
                .UserAssembly);

            dlls = dlls.Select(x => Path.Combine(Directory.GetCurrentDirectory(), x)).ToArray();
            dlls = dlls.Union(root).ToArray();
            
            foreach (string dll in dlls)
            {
                Debug.Log($"DLL: {dll}");
            }

            Debug.Log("?????");
            HandleAssemblyReload(false, false, dlls, Path.GetDirectoryName(dlls[0]), null, null);
            Debug.Log("!!!!!");

All dlls are printed fine, but Burst compiler error somehow appears in between ??? and !!! Debug.Logs. Here’s the debug log.

** MORE DLL LINES HERE OMITED ***
DLL: C:/Users/.../Library/PackageCache/com.unity.burst@1.8.17/Unity.Burst.CodeGen/Unity.Burst.Cecil.Rocks.dll

?????

C:\Users\...\Assets\UserCode\CsWrappers\EvhWrapper.cs(41,13): Burst error BC1016: The managed function `Meetem.EvhWrapper.get_EventHandle(Meetem.EvhWrapper* this)` is not supported

!!!!!

The error Burst is throwing should be non-existent because my post processing fixing it. But for some reason Burst compiling is executed in-between my post processing code?

How do I guarantee that my IL post processing is executed before Burst, and other question how do I guarantee that my IL post processing is executed after Burst, e.g. how do I control the order of post processing?

UPD: Ok, it seems like Burst compiling is running asynchrnously and doesn’t respect the post processors. E.g. can run while CompilationPipeline.compilationFinished handlers are running.
Don’t know if it’s by-design.

2

You can hook into Unity’s package ILPP using asmref. I’ve hooked into the Entities package version, but I think there’s one in the collections package you could also hook into. Example: Latios-Framework/ILPostProcessing at master · Dreaming381/Latios-Framework · GitHub

3

Thank you, while it’s simillar, but there’s also no guarantee that your ILPostProcess will run before default one.

4

It is guaranteed to run before Burst. If you need it to run before Unity’s other ILPostProcessors, then that is a totally different matter.

5

Ah, yes, you are right, will check it. Thank you!

6

Unfortunately this solution doesn’t allow to reference other assemblies, so I can’t include custom Mono.Cecil (Burst assembly is using custom Mono.Cecil contrary to Entities package) or other managed dlls and user code :frowning: