RFR(XS): 8209588: SIGSEGV in MethodArityHistogram() with -XX:+CountCompiledCalls

[Lindenmaier, Goetz]

Hi Lutz, 

the change looks good. 

All the checks using SafeFetch seem costly, but as I can see that's 
nowhere performance relevant.  So it's acceptable for this code.

Best regards,
  Goetz.

> -----Original Message-----
> From: hotspot-compiler-dev <hotspot-compiler-dev-
> bounces at openjdk.java.net> On Behalf Of Schmidt, Lutz
> Sent: Freitag, 17. August 2018 18:14
> To: hotspot-compiler-dev at openjdk.java.net
> Subject: [CAUTION] RFR(XS): 8209588: SIGSEGV in MethodArityHistogram()
> with -XX:+CountCompiledCalls
> 
> Dear all,
> 
> 
> 
> may I please request reviews for this little change which prevents use of an
> uninitialized pointer.
> 
> 
> 
> Bug:   https://bugs.openjdk.java.net/browse/JDK-8209588
> <https://bugs.openjdk.java.net/browse/JDK-8209588>
> 
> Webrev: http://cr.openjdk.java.net/~lucy/webrevs/8209588.00/
> <http://cr.openjdk.java.net/~lucy/webrevs/8209588.00/>
> 
> 
> 
> Thank you and enjoy your weekend!
> 
> Lutz
> 
> 
> 
>