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

[Max Ockner]

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/

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