RFR: 8022853: add ability to load uncompressed object and Klass references in a compressed environment to Unsafe

[Christian Thalinger]

> On Apr 22, 2015, at 11:16 AM, Vitaly Davidovich <vitalyd at gmail.com> wrote:
> 
> stray '\', I meant
> 
> On Wed, Apr 22, 2015 at 2:16 PM, Vitaly Davidovich <vitalyd at gmail.com>
> wrote:
> 
>> Chris, I think you have a stray '/' here:
>> 
>> 185   if (UseCompressedOops) {            \
>> 
>> ?

I do.  Thanks for noticing.

>> 
>> 
>> 
>> On Wed, Apr 22, 2015 at 1:56 PM, Christian Thalinger <
>> christian.thalinger at oracle.com> wrote:
>> 
>>> https://bugs.openjdk.java.net/browse/JDK-8022853
>>> 
>>> In some native data structures of the VM oops are stored uncompressed
>>> even if compressed oops are turned on, for example Klass::_java_mirror.
>>> Java code which is tightly coupled with the VM should have the ability to
>>> read and write such fields.
>>> 
>>> This additional Unsafe API make the implementation of JEP 243: Java-Level
>>> JVM Compiler Interface simpler.
>>> 
>>> http://cr.openjdk.java.net/~twisti/8022853/hotspot/webrev.01/
>>> http://cr.openjdk.java.net/~twisti/8022853/jdk/webrev.01/
>>> 
>>> 
>>