RFR(S): 8155241: Crash with assert in Xcomp mode and with disabled ReduceBulkZeroing

Vladimir Kozlov vladimir.kozlov at oracle.com
Tue May 10 17:33:05 UTC 2016

Is it only assert problem? Based on your comment "takes care of zeroing 
the array" it may be not enough. Can you explain more?


On 5/10/16 3:26 AM, Tobias Hartmann wrote:
> Hi,
> please review the following patch:
> https://bugs.openjdk.java.net/browse/JDK-8155241
> http://cr.openjdk.java.net/~thartmann/8155241/webrev.00/
> JDK-8076188 introduced code that eliminates an arraycopy if the destination is non escaping. The newly added LoadNode::find_previous_arraycopy() assumes that a clonebasic arraycopy that overwrites a newly allocated array always sets the corresponding InitializeNode to "complete", i.e., takes care of zeroing the array. However, this is only the case if ReduceBulkZeroing is enabled.
> I fixed the assert and added a regression test.
> Tested with JPRT and RBT (running).
> Thanks,
> Tobias

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