[foreign-memaccess+abi] RFR: 8296417: Make memory session a pure lifetime abstraction [v6]

[Maurizio Cimadamore]

On Mon, 7 Nov 2022 09:22:24 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix SegmentAllocator.slicingAllocator to throw IIOBE
>
> src/java.base/share/classes/java/lang/foreign/MemorySegment.java line 1242:
> 
>> 1240:      */
>> 1241:     static MemorySegment allocateNative(long byteSize, long byteAlignment, MemorySession session) {
>> 1242:         Objects.requireNonNull(session);
> 
> Swap checking order

Some of our tests (TestNulls) rely on nulls being checked first. I'm ok with swapping when there are two null checks (as in `allocateNative(MemoryLayout, MemorySession)`).

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PR: https://git.openjdk.org/panama-foreign/pull/750