Event descriptions are truncated in logs

[Yasumasa Suenaga]

Hi,

Have you ever checked event strings in hs_err or VM.info?
Please see as below!


Yasumasa


On 2018/05/01 9:41, Yasumasa Suenaga wrote:
> Hi all,
> 
> I found event description in hs_error log and VM.info dcmd are trucated as following:
> 
> ```
> Event: 1.977 Thread 0x00007f1720010800 Exception <a 'java/lang/IncompatibleClassChangeError'{0x00000000d7a338f0}: Found class java.lang.Object, but interface was expected> (0x00000000d7a338f0) thrown at [/scratch/opt/mach5/mesos/work_dir/slaves/9190d864-6621-4810-ba08-d8d8c75ba674-S702/framewo
> ```
> 
> I think we can fix it as this webrev. Is it acceptable?
> If so, I will file it to JBS and send review request.
> 
>    http://cr.openjdk.java.net/~ysuenaga/event-msg-truncated/
> 
> This webrev shows event description as following:
> 
> ```
> Event: 3.660 Thread 0x00007fa174018800 Exception <a 'java/lang/NoSuchMethodError'{0x00000000d778f878}: java.lang.invoke.DirectMethodHandle$Holder.invokeInterface(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)V> (0x00000000d778f878) thrown at [/home/ysuenaga/OpenJDK/jdk/src/hotspot/share/interpreter/linkResolver.cpp, line 755]
> ```
> 
> But I concern this change might not work when HotSpot is built with VS 2013 or earlier.
> This change uses vsnprintf() to get length of string, but _vscprintf() will be used when older Visual Studio is used to build.
> 
> 
> Thanks,
> 
> Yasumasa
>