RFR: 8062247: Allow WhiteBox test to access JVM offsets

[Yumin Qi]

Misha,

   It is a generic name, now it only targets on FileMapHeader, it can 
add other data structure of vm if needed in future. Maybe a name like 
getOffsetForName(String name) is better?

Thanks
Yumin

On 10/31/2014 11:56 AM, Mikhailo Seledtsov wrote:
> Hi Yumin,
>
>  The name getOffsets() seems too generic. Perhaps, we could rename it 
> to be more specific to the task.
>
> Thank you,
> Misha
>
> On 10/29/2014 5:46 PM, Yumin Qi wrote:
>> Please review the new changeset at same location.
>> New API supply an interface to get data member offset by it's name.
>> http://cr.openjdk.java.net/~minqi/8062247/webrev00/
>>
>> Thanks
>> Yumin
>>
>> On 10/27/2014 9:01 PM, Yumin Qi wrote:
>>> Please review
>>>
>>> bug: https://bugs.openjdk.java.net/browse/JDK-8062247
>>> webrev: http://cr.openjdk.java.net/~minqi/8062247/webrev00/
>>>
>>> Summary: Internal test failed since the variable offsets changed in 
>>> hotspot. The way to get offset in the test is hard-coded. To reduce 
>>> the risk of future changes of hotspot offsets, the fix add a 
>>> WhiteBox API function to get a map for FileMapHeaderInfo, which 
>>> return the members' offsets in a Hashtable.
>>>
>>> Tests: JPRT, jtreg.
>>>
>>> Thanks
>>> Yumin
>>
>