RFR: 8214257: IC cache not clean after cleaning assertion failure

[Tobias Hartmann]

Hi Erik,

looks good to me. Please run at least hs-tier1,hs-tier2,hs-precheckin-comp before pushing.

Best regards,
Tobias

On 27.11.18 14:00, Erik Österlund wrote:
> Hi,
> 
> Back in 8212681, an abstract CompiledICLocker was introduce to protect inline caches from concurrent
> patching.
> 
> Unfortunately, not all patching of ICs started using the CompiledICLocker. There were still some
> callsites using the Patching_lock. Therefore, the assert may trigger sometimes saying the IC cache
> is not clean right after cleaning, due to other concurrent modifications under the Patching_lock.
> 
> Also, in CompiledIC::set_to_clean(), the condition for safe_transition was altered incorrectly from
> is_at_safepoint() to CompiledICLocker::is_safe(), causing cleaning to not used transition, so I
> reinstated that in this patch.
> 
> This patch depends on 8214338 by assuming that the CompiledICLocker does not use safepoint checks,
> as it is now used from leaf calls where safepointing is not allowed.
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8214257
> 
> Webrev:
> http://cr.openjdk.java.net/~eosterlund/8214257/webrev.00/
> 
> Thanks,
> /Erik