Request for reviews (S): 6998985: faulty generic arraycopy on windows x86_64: 4th arg overwritten with oop

[Christian Thalinger]

JPRT found a bug.  I have to look what goes wrong.  -- Christian

On Nov 17, 2010, at 6:54 PM, Tom Rodriguez wrote:
> Looks good.
>
> tom
>
> On Nov 17, 2010, at 8:42 AM, Christian Thalinger wrote:
>
>> http://cr.openjdk.java.net/~twisti/6998985/webrev.01/
>>
>> 6998985: faulty generic arraycopy on windows x86_64: 4th arg  
>> overwritten with oop
>> Reviewed-by:
>>
>> There is a problem concerning generic arraycopy on windows x86_64.   
>> On
>> windows, the stub gets its 4th argument in register r9.  The register
>> gets overwritten by an oop.  In most cases, the subsequent range  
>> check
>> will fail and the copy will be done over the slow path.  However,
>> depending on the oops address, the range check might succeed and the
>> copy lead to wrong results.
>>
>> Tested with failing testcase.
>