RFR: 8316514: Better diagnostic header for VtableStub
Aleksey Shipilev
shade at openjdk.org
Wed Sep 20 17:31:38 UTC 2023
On Tue, 19 Sep 2023 10:07:28 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:
> Similar to [JDK-8316178](https://bugs.openjdk.org/browse/JDK-8316178), but for VtableStubs. JMH perfasm would like to know where the stub code ends.
>
> Printout before this fix:
>
>
> Decoding VtableStub vtbl[5]@281473683415027
> --------------------------------------------------------------------------------
> 0x0000ffff9bf22320: ldr w16, [x1, #8]
> 0x0000ffff9bf22324: movk x16, #0x98, lsl #32
> 0x0000ffff9bf22328: ldr x12, [x16, #496]
> 0x0000ffff9bf2232c: ldr x8, [x12, #64]
> 0x0000ffff9bf22330: br x8
> 0x0000ffff9bf22334: udf #0
>
>
> Printout after this fix:
>
>
> --------------------------------------------------------------------------------
> Decoding VtableStub vtbl[5]@281473592893427 [0x0000ffff97f22320, 0x0000ffff97f22338] (24 bytes)
> --------------------------------------------------------------------------------
> 0x0000ffff97f22320: ldr w16, [x1, #8]
> 0x0000ffff97f22324: eor x16, x16, #0x3800000000
> 0x0000ffff97f22328: ldr x12, [x16, #496]
> 0x0000ffff97f2232c: ldr x8, [x12, #64]
> 0x0000ffff97f22330: br x8
> 0x0000ffff97f22334: udf #0
Thanks! I got it hooked up to JMH without problem.
Even though it looks trivial, I would like another review.
-------------
PR Comment: https://git.openjdk.org/jdk/pull/15816#issuecomment-1728160721
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