8232592: <Unknown compiled code> is shown in jstack mixed mode

[Yasumasa Suenaga]

Hi Paul,

After this change, we can see JNI call as below:

```
"process reaper" #14 daemon prio=10 tid=0x00007f12ec4b6000 nid=0x56a3 runnable [0x00007f12d009c000]
    java.lang.Thread.State: RUNNABLE
    JavaThread state: _thread_in_native
0x00007f12f43f5596      __waitpid + 0x56
0x00007f12dc5c134d      java.lang.ProcessHandleImpl.waitForProcessExit0(long, boolean) + 0xed (Native method)
0x00007f12d579730c      * java.lang.ProcessHandleImpl$1.run() bci:8 line:138 (Compiled frame)
```


Thanks,

Yasumasa


On 2019/10/19 1:59, Hohensee, Paul wrote:
> What is the output with your patch?
> 
> Thanks,
> 
> Paul
> 
> On 10/18/19, 1:38 AM, "serviceability-dev on behalf of Yasumasa Suenaga" <serviceability-dev-bounces at openjdk.java.net on behalf of suenaga at oss.nttdata.com> wrote:
> 
>      Hi all,
>      
>      Please review this change.
>      
>         JBS: https://bugs.openjdk.java.net/browse/JDK-8232592
>         webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8232592/webrev.00/
>      
>      I run `jhsdb jstack --mixed` to JShellToolProvider process, then I saw <Unknown compiled code>
>      in the stack as below:
>      
>      ```
>      "process reaper" #13 daemon prio=10 tid=0x00007f959c328000 nid=0x1285 runnable [0x00007f9578025000]
>          java.lang.Thread.State: RUNNABLE
>          JavaThread state: _thread_in_native
>      0x00007f95a27c5596 __waitpid + 0x56
>      0x00007f958c601d79 <Unknown compiled code>
>      0x00007f9585c5b4ac * java.lang.ProcessHandleImpl$1.run() bci:8 line:138 (Compiled frame)
>      ```
>      
>      0x7f958c601d79 is native method. jstack mixed mode should handle it.
>      This patch passed all tests on submit repo (mach5-one-ysuenaga-JDK-8232592-20191018-0600-6011163).
>      
>      
>      Thanks,
>      
>      Yasumasa
>      
>