RFR: (S): SA: clhsdb 'where -a' throws Assertion Failure with illegal code 236 when CDS is used

Jini George jini.george at oracle.com
Tue May 8 03:38:45 UTC 2018

Thank you very much, Ioi, for the review and for the clarifications and 
help provided offline. I have added the checks for _nofast_getfield and 
_nofast_putfield. SA has a bug due to which for iload, only the base 
bytecode (iload) gets displayed -- fast_iload and nofast_iload do not 
get displayed. JDK-8202693 (SA: clhsdb printall only displays the base 
bytecode for iload) has been filed for this. I would add the test for 
nofast_iload along with the fix for JDK-8202693.

The modified webrev is at:



On 4/27/2018 1:54 AM, Ioi Lam wrote:
> HI Jini,
> [1] "_nofast_aload" should be "_nofast_aload_0": aload and aload_0 are 
> two different bytecodes.
> [2] Only the _nofast_aload_0 bytecode is tested. For completeness, do 
> you think it makes sense to add test cases for these other 3 bytecodes?
>      _nofast_getfield
>      _nofast_putfield
>      _nofast_iload
> Thanks
> - Ioi
> On 4/26/18 11:15 AM, Jini George wrote:
>> Hello all,
>> Please review the following proposed fix for the issue:
>> https://bugs.openjdk.java.net/browse/JDK-8174995
>> Webrev: http://cr.openjdk.java.net/~jgeorge/8174995/webrev.00/
>> Issue: Clhsdb commands like 'where -a', 'printall' would throw an 
>> illegal code assertion failure when CDS is used.
>> Root cause and proposed fix: SA has been unaware of the new bytecodes 
>> introduced for rewriting at CDS dump time (_nofast* bytecodes). The 
>> fix is to make SA aware of these new _nofast* bytecodes.
>> Tests Run and Passed: SA tests on Mach5 (including the tests modified 
>> to test this fix).
>> Thank you,
>> Jini.

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