RFR: 8263377: Store method handle linkers in the 'non-nmethods' heap

[Dean Long]

On Fri, 3 Jun 2022 18:01:40 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> 8263377: Store method handle linkers in the 'non-nmethods' heap
>
> src/hotspot/share/code/codeBlob.cpp line 342:
> 
>> 340: MethodHandleIntrinsicBlob* MethodHandleIntrinsicBlob::create(const methodHandle& method,
>> 341:   CodeBuffer *code_buffer) {
>> 342:   code_buffer->finalize_oop_references(method);
> 
> Can you please explain why this is needed? (I'm a bit surprised since the constructor asserts that `total_oop_size` is 0)
> 
> Thanks.

I don't think finalize_oop_references() makes sense except for nmethods.  If the MH intrinsic could contain contain oops, then GC would need to be able to find and relocate them.

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PR: https://git.openjdk.java.net/jdk/pull/8760