Any way to avoid JIT overhead for small programs when using AOT?

[dean.long at oracle.com]

On 9/9/18 8:58 PM, jayaprabhakar k wrote:
> Hi,
> I understand that at present AOT and -Xint are not compatible. I see 
> the code explicitly disables AOT when -Xint is set 
> <http://cr.openjdk.java.net/%7Ekvn/8171137/webrev/raw_files/new/src/share/vm/aot/aotLoader.cpp>.
>
> For extremely short programs, typically used by beginners learning 
> Java, I see that CDS, AOT and Xint all help reduce the startup time. 
> While CDS works with both AOT and Xint, multiplying the benefits, AOT 
> and Xint do not.
>
> Is there a way to keep both AOT + Xint, For classes/methods that are 
> precompiled, use AOT code, and for others just interpret? If not now, 
> would it be possible in the future?
>
> Thanks,
> JP

Hi JP.  Yes, it could be possible in the future.  One problem is 
MethodHandle intrinsics.  With -Xint, there's no code heap, so no place 
to generate native adapters for those intrinsics.

dl
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