Stepping in debugger switches to interpretation mode

[Chris Plummer]

On 5/31/24 7:25 AM, Severin Gehwolf wrote:
> On Fri, 2024-05-31 at 14:44 +0200, Maksim Zuev wrote:
>> Dear Sir/Madam,
>>
>> I encountered a problem while debugging the code. I am attaching the
>> reproducer to this email in the Main.java file.
>>
>> When running it with the debugger without stepping, the application
>> runs in less than a second (see jdb output in the jdb_run.txt file).
>> However, after performing a single step, the application is running
>> in interpretation mode, becoming very slow (see jdb output in the
>> jdb_step.txt file).
>>
>> I assume running in the interpreter mode, as I
>> see InterpreterRuntime::post_method_exit
>> calls in the profiler.
>>
>> Could you please help me figure out what causes the application to
>> run in the interpreter mode? Is this a bug or an expected behavior?
>> Are there any ways to work around this issue?
> I think this is:
> https://bugs.openjdk.org/browse/JDK-8229012
>
> Thanks,
> Severin
>
Yes, that seems likely. It should resolve itself once you exit the 
method you were single stepping in. But as mentioned in the bug, if you 
single step in the main method of a thread, that thread will forever run 
interpreted.

Chris