review (S) for 7031614: jmap -permstat fails with java.lang.InternalError in sun.jvm.hotspot.oops.OopField.getValue

Vladimir Kozlov vladimir.kozlov at
Tue Mar 29 14:00:01 PDT 2011



Tom Rodriguez wrote:
> On Mar 29, 2011, at 11:41 AM, Vladimir Kozlov wrote:
>> Looks good but I would not call it small (S) ;)
>> 369  // lookup but since it's no used for these currently
>>                              ^ not?
>> why you need such spacing?
>> 47     Type type            = db.lookupType("instanceMirrorKlass");
>>  55     // klass and oop_size are a HotSpot magic field and hence we
>>                                   ^               ^ fields
> I've fixed all those.  Thanks.
> tom
>> Vladimir
>> Tom Rodriguez wrote:
>>> 7031614: jmap -permstat fails with java.lang.InternalError in sun.jvm.hotspot.oops.OopField.getValue
>>> Reviewed-by:
>>> There were some places that were finding static fields by iterating
>>> over the InstanceKlass object which I missed in my original changes.
>>> I added an iterateStaticFields that hides the owner the static fields
>>> and uses the OopVisitor.getObj to return the proper object.  I
>>> inspected all the iterateFields call sites to make sure I didn't miss
>>> any.  Additionally iteration of the mirror wasn't visiting the static
>>> fields so some roots might be missed by the reverse pointers analysis.
>>> There is heap iteration code in the SA and the InstanceMirrorKlass
>>> wasn't plugged into the the oop sizing logic in the SA which caused
>>> some searches to fail.  I needed to add access to oop_size so I moved
>>> the java_lang_Class style utilities into their own class and made them
>>> like normal SA style classes.  Tested with the full tmtools suite that
>>> showed these issues plus some other which don't appear to have been
>>> reported.

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