RFR: 8316514: Better diagnostic header for VtableStub [v2]

[Aleksey Shipilev]

On Fri, 22 Sep 2023 06:12:36 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
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use PTR_FORMAT consistently

Thank you!

-------------

PR Comment: https://git.openjdk.org/jdk/pull/15816#issuecomment-1731700676