---- Reported by richard.torkar@htu.se 2005-12-29 07:35:34 MST ----

(Dunno which component to file this under, JIT maybe Paolo?)

Description of Problem:
I have below a simple example that works on Windows .NET (1.1.4322) and
Linux (Mono 1.1.9.2), but bails with a System.NullReferenceException on OS
X (Mono 1.1.11).

Steps to reproduce the problem:
Compile and run the example.

//
using System;
using System.Diagnostics;
using System.Reflection;

class Foo
{
  [STAThread]
  static void Main(string[] args)
  {
    Foo f = new Foo();	
    f.WhatsMyName();
  }

  private void WhatsMyName()
  {
    StackTrace stackTrace = new StackTrace();
    StackFrame stackFrame = stackTrace.GetFrame(1);
    MethodBase methodBaseCallee = stackFrame.GetMethod();
    // Displays "Callee name: Main"
    Console.WriteLine("Callee name: {0}", methodBaseCallee.Name);
    
    StackFrame stackFrameLocal = new StackFrame();
    MethodBase methodBase = stackFrameLocal.GetMethod();
    // Displays "Name of method: WhatsMyName"
    Console.WriteLine("Name of method: {0}", methodBase.Name);
  }
}
//

Actual Results:
On OS X I get a System.NullReferenceException, while on Windows and Linux I
get the correct behaviour (i.e. the C.WriteLine() are written).

Expected Results:
Callee name: Main
Name of method: WhatsMyName

Additional Information:
I copied the executable from Windows (compiled using csc and correctly
running) to Linux and OS X, and ran it using mono (it fails on OS X but not
on Linux).

FYI:
On OS X I use:
Mono JIT compiler version 1.1.11, (C) 2002-2005 Novell, Inc and
Contributors. www.mono-project.com
        TLS:           normal
        GC:            Included Boehm (with typed GC)
        SIGSEGV      : normal

On Linux I use:
Mono JIT compiler version 1.1.9.2, (C) 2002-2005 Novell, Inc and
Contributors. www.mono-project.com
        TLS: normal 
        GC: Included Boehm (with typed GC)
        SIGSEGV : normal Globalization: normal

And on Windows I use:
Microsoft (R) Visual C# .NET Compiler version 7.10.6001.4
for Microsoft (R) .NET Framework version 1.1.4322



---- Additional Comments From robertj@gmx.net 2005-12-29 14:43:48 MST ----


BTW, you should *never* rely on StackFrame. The MS .NET runtime
uses to inline methods if the app was compiled for RELEASE
and when the app isn't running by a debugger.
When this happens, callee and caller are not the expected
methods. You'll lose your mind, because you cannot debug
this problem: it doesn't occure while debugging ;-)

If you feel that you cannot live w/out this feature,
you have to mark each method that will act as a callee
or caller (in your sample) with

[MethodImpl(MethodImplOptions.NoInlining)]

while giving away some performance.

I bet mono behaves similar.




---- Additional Comments From richard.torkar@htu.se 2005-12-30 04:04:14 MST ----

But the sample runs w/o a problem on Windows (1.* and 2.*). As well as
Linux. How come it doesn't work on OS X?



---- Additional Comments From robertj@gmx.net 2005-12-30 06:16:28 MST ----

I did't say it's not a bug on PPC. I just wanted to warn
you about using StackFrame at all. Your simple sample may
work, but you should expect trouble using StackFrame at large
in your apps.



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   <cf_op_sys_details>OS X 10.4.3</cf_op_sys_details>
Unknown operating system unknown. Setting to default OS "Other".