ETW event Method/LoadVerbose contains wrong method signature for methods receiving function pointer (C#9)

[Temp1ar]

Description

For the method that receive function pointer I'm getting an LoadVerbose event with the value of MethodSignature representing the function pointer signature, not the actual method signature.

Reproduction Steps

1. Compile console application for .net 6.0 with the following code

namespace TestSignatures;

unsafe class Example
{
  public void Foo(Action<int> a, delegate*<out double, in int, bool> f)
  {
    var i = 10d;
    var j = 1;
    a(42);
    Thread.Sleep(200);
    f(out i, in j);    
  }
    
  public void Foo(Action<int> a, in int b, out int c, ref int d)
  {
    var i = 10d;
    var j = 1;
    a(42);
    Thread.Sleep(200);
    c = j;
    d = b;
  }
}
  
public class Program
{
  public static void Main(string[] args)
  {
    unsafe 
    {
      var e = new Example();
      e.Foo(i => { }, &Method);
      var b = 0;
      var c = 0;
      var d = 0;
      e.Foo(i => { }, b, out c, ref d);
    }
  }
    
  private static bool Method(out double d, in int i) 
  {
    d = 10d;
    Thread.Sleep(200);
    return true;
  }
}

2. Build application
3. Profile application with the PerfView or any other ETW profiler
4. Check the Method/LoadVerbose events, specifically the MethodSignature string field for methods with the name "Foo"

Expected behavior

I expect to see signatures like these:

instance void  (class System.Action`1<int32>,bool(required_modifier System.Runtime.InteropServices.OutAttribute float64&,required_modifier System.Runtime.InteropServices.InAttribute int32&))
instance void  (class System.Action`1<int32>,int32&,int32&,int32&)

Actual behavior

I see following signatures:

bool(required_modifier System.Runtime.InteropServices.OutAttribute float64&,required_modifier System.Runtime.InteropServices.InAttribute int32&)
instance void  (class System.Action`1<int32>,int32&,int32&,int32&)

Regression?

I believe it's broken since the addition of the function pointers to the language, but I'm not sure.

Known Workarounds

No response

Configuration

• .NET 6.0
• Windows 10
• x64
• I doubt

Other information

No response

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[ghost]

Tagging subscribers to this area: @JulieLeeMSFT
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

For the method that receive function pointer I'm getting an LoadVerbose event with the value of MethodSignature representing the function pointer signature, not the actual method signature.

Reproduction Steps

1. Compile console application for .net 6.0 with the following code

namespace TestSignatures;

unsafe class Example
{
  public void Foo(Action<int> a, delegate*<out double, in int, bool> f)
  {
    var i = 10d;
    var j = 1;
    a(42);
    Thread.Sleep(200);
    f(out i, in j);    
  }
    
  public void Foo(Action<int> a, in int b, out int c, ref int d)
  {
    var i = 10d;
    var j = 1;
    a(42);
    Thread.Sleep(200);
    c = j;
    d = b;
  }
}
  
public class Program
{
  public static void Main(string[] args)
  {
    unsafe 
    {
      var e = new Example();
      e.Foo(i => { }, &Method);
      var b = 0;
      var c = 0;
      var d = 0;
      e.Foo(i => { }, b, out c, ref d);
    }
  }
    
  private static bool Method(out double d, in int i) 
  {
    d = 10d;
    Thread.Sleep(200);
    return true;
  }
}

2. Build application
3. Profile application with the PerfView or any other ETW profiler
4. Check the Method/LoadVerbose events, specifically the MethodSignature string field for methods with the name "Foo"

Expected behavior

I expect to see signatures like these:

instance void  (class System.Action`1<int32>,bool(required_modifier System.Runtime.InteropServices.OutAttribute float64&,required_modifier System.Runtime.InteropServices.InAttribute int32&))
instance void  (class System.Action`1<int32>,int32&,int32&,int32&)

Actual behavior

I see following signatures:

bool(required_modifier System.Runtime.InteropServices.OutAttribute float64&,required_modifier System.Runtime.InteropServices.InAttribute int32&)
instance void  (class System.Action`1<int32>,int32&,int32&,int32&)

Regression?

I believe it's broken since the addition of the function pointers to the language, but I'm not sure.

Known Workarounds

No response

Configuration

• .NET 6.0
• Windows 10
• x64
• I doubt

Other information

No response

Author:	Temp1ar
Assignees:	-
Labels:	area-CodeGen-coreclr, untriaged
Milestone:	-

[JulieLeeMSFT]

@AndyAyersMS PTAL.

[AndyAyersMS]

These events are generated by the runtime, so updating the area path.

@mangod9 I'm probably not the best person to fix this, can you reassign?

[AaronRobinsonMSFT]

I see what is going on here. I will take this.