RFR: 8339492: StackMapDecoder::writeFrames makes lots of allocations [v2]

[David M. Lloyd]

On Wed, 4 Sep 2024 15:27:40 GMT, Chen Liang <liach at openjdk.org> wrote:

> > I'll see if I can get the benchmarks in `test/micro/org/openjdk/bench/jdk/classfile` working. It looks like there may be one or more of them which would reach into this code.
> 
> Just checked; no benchmark is currently supplying a manual `StackMapTableAttribute` to class building, so new benchmark is required. Fyi this is only used by manual stack map building; internally we use a `StackMapGenerator.stackMapTableAttribute()` which is an ad-hoc attribute for writing only.

OK. Is this critical for merging the PR? I could likely come up with something but it'd have to wait a bit due to other priorities (this was meant to be a quick Friday task 😅).

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PR Comment: https://git.openjdk.org/jdk/pull/20841#issuecomment-2329466089