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

[Hohensee, Paul]

Lgtm.

Thanks,

Paul

On 10/18/19, 4:28 PM, "Yasumasa Suenaga" <suenaga at oss.nttdata.com> wrote:

    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
    >      
    >