RFR: 8308092: Replace NULL with nullptr in gc/x

[David Holmes]

On Tue, 16 May 2023 09:34:55 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> src/hotspot/share/gc/x/xBarrier.inline.hpp line 229:
>> 
>>> 227: //
>>> 228: inline oop XBarrier::load_barrier_on_oop(oop o) {
>>> 229:   return load_barrier_on_oop_field_preloaded((oop*)nullptr, o);
>> 
>> Casts should not be needed on `nullptr`.
>
> They are needed to disambiguate the two overloaded functions that take `volatile oop*` and  `volatile narrowOop*` respectively.

Ah I see.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13984#discussion_r1195065207