Stepping Into Statics Helper Code

[mikelle-rogers]

Description

When I step into the code, it steps into RuntimeHelpers.CoreCLR.cs.

Reproduction Steps

class Program
{
    [DllImport("libc")]
    private static extern int puts(string str);

    static void Main()
    {
        puts("Hello, World!"); //step into me
    }
}

Expected behavior

We should not be stepping into the Statics helper code.

Actual behavior

When I step into puts, I land in RuntimeHelpers.CoreCLR.cs in the following function:

[MethodImpl(MethodImplOptions.AggressiveInlining)]
public ref DynamicStaticsInfo GetDynamicStaticsInfo()
{
    return ref Unsafe.Subtract(ref Unsafe.As<MethodTableAuxiliaryData, DynamicStaticsInfo>(ref this), 1);
}

Regression?

No response

Known Workarounds

No response

Configuration

.NET 9 on MacOS arm64

Other information

@davidwrighton

[MichalPetryka]

Wouldn't it be enough to put DebuggerStepThroughAttribute or DebuggerHiddenAttribute on the method?

[rcj1]

Reopening to try on .NET 10

[rcj1]

Was able to repro issue on .NET 10 on Windows using code from issue #114820 :

class Program
{
    private readonly static object s_param = new();
    static void MyFunction(object param)
    {
        Console.WriteLine(param);
    }

    static void Main(string[] args)
    {
        MyFunction(s_param); // break and step in. 

        Console.WriteLine("Done. Press any key to continue.");
        Console.ReadLine();
    }
}

[rcj1]

Adding DebuggerStepThroughAttribute and DebuggerHiddenAttribute fixed this issue, added decorators on several other functions as well.

Adding the decorators to GetThreadStaticsBase() prevented stepping into said function during use of ThreadStatic variables.