[Bug]: IL2CPP 32-bit struct layouts are mismatched

[just-ero]

What helper class does this issue occur on?

Unity

Description

32-bit versions of IL2CPP act somewhat special.

Games on Unity 2020.1 appear to load pre-2019 structs (Il2CppClass version which does not contain unity_user_data). However, the cctor_thread field is decorated with ALIGN_TYPE(8). It is likely a field of pointer-type size, but it must be 8-byte aligned, which causes alignment issues on 32-bit games.

Since there aren't many 32-bit IL2CPP games, this issue is currently not of high priority.

Shown below is an example from the game "Granny 3" for the PC.

Reproduction Steps

state("Granny 3") {}

startup
{
  Assembly.Load(File.ReadAllBytes("Components/asl-help")).CreateInstance("Unity");
}

init
{
  vars.Helper.TryLoad = (Func<dynamic, bool>)(mono =>
  {
    var invSys = mono["InventorySystem"];

    return true;
  });
}

Error Messages

---

Regression?

No response

Potential Causes and Fixes

The structs being outdated like that may go back to the version of the IL2CPP library, which the helper is able to infer. It may be possible to fix that issue through that.

The alignment issue cannot be fixed easily. It likely requires a new custom attribute in the structs which the TypeParser class will have to account for.