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

[Christian Thalinger]

Thank you, Coleen.

> On Apr 22, 2015, at 1:42 PM, Coleen Phillimore <coleen.phillimore at oracle.com> wrote:
> 
> 
> Christian,
> This looks really good.
> Thanks!!
> Coleen
> 
> On 4/22/15, 1:56 PM, Christian Thalinger 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/
>> 
>