Non-blittable data error occurs with the struct contains Boolean in Windows IL2CPP. (Unity2021 and above)

[qwe321qwe321qwe321]

I already have the solution. Just open an issue to let other users know.

Error log

ArgumentException: Object contains non-primitive or non-blittable data.
  at Stella3D.SharedArray`2[T,TNative].Initialize () [0x00000] in <00000000000000000000000000000000>:0 
  at NewBehaviourScript.CreateSharedArray[T] () [0x00000] in <00000000000000000000000000000000>:0 
  at NewBehaviourScript.OnGUI () [0x00000] in <00000000000000000000000000000000>:0 

How to reproduce

I made a simple script to reproduce.

void OnGUI()
{
    if (GUI.Button(new Rect(10, 10, 300, 30), "Create NativeArray A"))
    {
        CreateNativeArray<CustomStructA>();
    }
    if (GUI.Button(new Rect(10, 50, 300, 30), "Create SharedArray A"))
    {
        CreateSharedArray<CustomStructA>();
    }
}

private void CreateNativeArray<T>() where T : unmanaged
{
    Debug.Log("CreateNativeArray " + typeof(T));
    // Create a native array.
    NativeArray<T> nativeArray = new NativeArray<T>(10, Allocator.Persistent);
    nativeArray.Dispose();
}

private void CreateSharedArray<T>() where T : unmanaged
{
    Debug.Log("CreateSharedArray " + typeof(T));
    // Create a shared array.
    Stella3D.SharedArray<T> sharedArray = new Stella3D.SharedArray<T>(10);
    sharedArray.Dispose();
}

public struct CustomStructA {
    public bool booleanVar;
}

1. Attach the script on a gameobject and build a development build in IL2CPP Windows.
2. Press the button Create SharedArray A and you will see that creating NativeArray<CustomStructA> worked, but SharedArray<CustomStructA> throwed the exception.

Environment:

• Unity 2021 LTS and above.
• Windows IL2CPP (It worked properly with Mono)

How does it happen

There is an Unity issue about the same error but occurs calling NativeArray.Copy.
https://issuetracker.unity3d.com/issues/argumentexception-error-occurs-in-copy-method-of-nativearray-class-when-building-with-windows-il2cpp
I think it is the same internal issue but occured in different functions. Since it fixed in 2022.2.19f1, this issue goes away from Unity 2022 as well.

And there is a dicussion about this issue in 2020
https://forum.unity.com/threads/argument-exception-on-windows-il2cpp-build-with-burst-jobs.836059/
As tertle said, IL2CPP and Burst together may have issues with bools. This is how I found out where the issue was coming from.

Struct with bool fields causes this issue.

Solution / Workaround

Add this attribute [MarshalAs(UnmanagedType.U1)] to your boolean fields.

public struct CustomStructA {
    [MarshalAs(UnmanagedType.U1)]
    public bool booleanVar;
}

I found there is bool2 in Unity.Mathematics package and it worked well.
That is the attribute they used for bool struct series.
https://github.com/Unity-Technologies/Unity.Mathematics/blob/master/src/Unity.Mathematics/bool2.gen.cs