RFR: 8316178: Better diagnostic header for CodeBlobs

[Tobias Hartmann]

On Wed, 13 Sep 2023 10:42:23 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> I realized that JMH perfasm misses some CodeBlobs, notably C1 RuntimeBlobs. While amending perfasm to capture those, I discovered the header printout for those blobs is not as convenient as for others. Notably, perfasm would like to know where the stub code ends.
> 
> 
> # Good:
> StubRoutines::sha512_implCompressMB [0x0000000117da2d80, 0x0000000117da3528] (1960 bytes)
> 
> # Bad:
> Decoding RuntimeStub - _complete_monitor_locking_Java 0x0000000117e4fd10
> 
> 
> After this change, we print this:
> 
> 
> Decoding RuntimeStub - _complete_monitor_locking_Java 0x0000000114203110 [0x00000001142031c0, 0x0000000114203258] (152 bytes)
> 
> 
> Note it still prints the (base) stub address. I think it is still useful for debugging. The brackets print the code size, because that is what the decoding block handles: the code.

Looks good to me.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15708#pullrequestreview-1624354080