[foreign-jextract] RFR: 8237573: Add a basic call overhead benchmark

[Maurizio Cimadamore]

On Wed, 25 Mar 2020 21:42:48 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> Hi,
>> 
>> Per my earlier email [1], this PR adds some basic call overhead benchmarks.
>> 
>> 2 benchmarks are added:
>> - CallOverhead, which measures both an empty and an identity function call.
>> - PointsDistance, which extends the existing points benchmarks with one that measures the distance between 2 points doing
>>   the calculation is C (using a native call).
>> 
>> The latter also shows the difference between passing a pointer to a struct, vs passing a struct by value,
>> PointsDistance.panama_MemoryAddress and PointsDistance.panama_MemorySegment respectively.
>> This acts as a basis to test the coming performance improvements in this area.
>> 
>> Thanks,
>> Jorn
>> 
>> [1] : https://mail.openjdk.java.net/pipermail/panama-dev/2020-March/008007.html
>
> test/micro/org/openjdk/bench/jdk/incubator/foreign/points/support/libPoint.c line 23:
> 
>> 22:  */
>> 23: #include <math.h>
>> 24:
> 
> Suggestion:
> 
> #include <stdlib.h>
> #include <math.h>

I needed this change to make it compile on Linux (I actually need both includes).

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PR: https://git.openjdk.java.net/panama-foreign/pull/65