RFR: 8029630: Print thread id hex representation in error messages.

[David Holmes]

Hi Max,

On 10/04/2015 5:11 AM, Max Ockner wrote:
> Hi again,
> After working past some build issues, I have a new webrev.  I've changed
> %x to PTR_FORMAT, and I've removed the modification to thread.cpp
>
> New webrev: http://cr.openjdk.java.net/~mockner/8029630.4/

I think INTPTR_FORMAT would be more of a semantic match as the thread id 
is not a pointer type.

David

> Thanks,
> Max
>
> On 4/6/2015 9:10 PM, David Holmes wrote:
>> Hi Max,
>>
>> On 3/04/2015 5:38 AM, Max Ockner wrote:
>>> Hello,
>>> Please review this change:
>>>
>>> Bug:  https://bugs.openjdk.java.net/browse/JDK-8029630
>>> Webrev: http://cr.openjdk.java.net/~mockner/8029630.2/
>>> Summary: Existing error messages for vm crashes print the decimal
>>> representation of the current thread id. The message format has been
>>> changed to print the hex value of the thread id.
>>
>> src/share/vm/runtime/thread.cpp
>>
>> The change is incorrect and unnecessary. 'this' is a pointer type so
>> INTPTR_FORMAT seems correct (though it may need p2i(this)?) while %x
>> assumes 'this' is always 32-bit. Further INTPTR_FORMAT is already hex
>> not decimal.
>>
>> src/share/vm/utilities/vmError.cpp
>>
>> As Thomas pointed out%x assumes 32-bit and so is incorrect for intx
>> type. As intx is a typedef for intptr_t then INTPTR_FORMAT should be
>> usable here as well.
>>
>> David
>>
>>> Tested with jtreg runtime to make sure nothing was broken. I tested the
>>> new functionality separately. I crashed the vm and examined the debugger
>>> output to make sure the hexadecimal thread id printed in the error
>>> message matched one of the threads listed by the debugger.
>>>
>>> Thanks,
>>> Max
>