With the current bits in jdk9/hs and graal-core, the following bootstrapping
command works in terms of replacing Graal in the JDK:
java -server -XX:+UnlockExperimentalVMOptions
--patch-module=jdk.vm.compiler=.jar -XX:+UseJVMCICompiler -XX:+BootstrapJVMCI
However, the --patch-module + --upgrade-module-path trick we’re using to
replace the version of Graal in the JDK apparently only works due to a bug that
will be fixed at some point. From Mandy Chung:
"-—patch-module is to patch a module to replace or add content of that module
and yes it disables the hash checking on the patched module. However, it’s not
intended to allow it to combine with —-upgrade-module-path as you did, to
change the module dependences."
Given all the continuing flux around jigsaw, we cannot be sure that developing
and using GitHub Graal on JDK 9 is stable until jigsaw is stable.
> On 16 Feb 2017, at 10:17, Andrew Haley <a...@redhat.com> wrote:
> On 15/02/17 21:56, Christian Thalinger wrote:
>>> On Feb 14, 2017, at 4:38 AM, Andrew Haley <a...@redhat.com> wrote:
>>> On 14/02/17 14:37, Alan Bateman wrote:
>>>> --patch-module can be used to patch any module in the boot layer. So if
>>>> you are looking to override or add classes then --patch-module should work.
>>> Aha! Thanks,
>> Does it?
> Not quite. The problem is that the service loader finds classes in
> the Hotspot copy of Graal which don't exist in the external copy, and
> chaos ensues.
> I suppose the only way to make it work is to replace the copy of Graal
> in HotSpot, but I don't think that's a trivial thing to do.