RFR 8235262: Move c2i_entry_barrier for x86_32 to shared

[Zhengyu Gu]

Hi Erik,

Updated: http://cr.openjdk.java.net/~zgu/JDK-8235262/webrev.01/index.html

Test:
   Reran hotspot_gc and submit tests


Thanks,

-Zhengyu

On 12/4/19 9:30 AM, Erik Österlund wrote:
> Hi Zhengyu,
> 
> Since the 32 bit stuff is just a copy paste of the 64 bit stuff, with 
> some small tweaks, I think it might be easier to read and maintain if 
> you tried to merge the two implementations and just do things different 
> where it is different.
> 
> Thanks,
> /Erik
> 
> On 2019-12-04 11:21, Zhengyu Gu wrote:
>> When integrating JDK-8230765 [1], I did not integrate 
>> c2i_entry_barrier. The implementation is not GC specific, should be 
>> moved to shared.
>>
>> Again, the implementation is very similar to x86_64 version, except it 
>> manufactures two temporary registers to act as scratch1 and scratch2 
>> registers in x86_64.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8235262
>> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8235262/webrev.00/index.html
>>
>>
>> Test:
>>   hotspot_gc (fastdebug and release) with x86_64 and x86_32 JVM on Linux
>>   submit tests
>>
>>
>> Thanks,
>>
>> -Zhengyu
>>
>> [1] https://bugs.openjdk.java.net/browse/JDK-8230765
>>
>