[foreign-abi] RFR: 8248560: Specify the behaviour of the ForeignLinker returned by CSupport::getSystemLinker [v2]

[Paul Sandoz]

On Tue, 15 Sep 2020 17:27:45 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> @mcimadamore & @PaulSandoz Thanks for the review, I've applied the suggested changes:
>> https://github.com/openjdk/panama-foreign/pull/327/commits/24f77111f5817c22decbeef5bee91218784158e9
>> I've also fixed a test that I noticed was no longer doing what is was supposed to (pre-existing to this PR).
>
>> By "de facto" do you mean the default? If so how does one get a non-default one? Do we expect that a developer or
>> third-party can implement this interface or is it only the jDK that provides the implementations? (i.e. ideally we
>> would like to seal it.)
> 
> By 'de facto' I mean that there is no official single C ABI for a particular platform, but in _practice_ there is only
> one. Maybe I'm being too pedantic here?
> It is only intended for internal JDK classes to implement this Interface. Sealing might be an option, though I'm not
> sure if the `permits` list of a sealed class counts as part of the specification, i.e. will adding or removing
> implementations need a CSR? That might be prohibitive.

Perhaps just say something like "Returns the C linker for the native platform"?

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PR: https://git.openjdk.java.net/panama-foreign/pull/327