Hi Rafat,
Thanks a lot for taking the time. I will look into the patch now.
Really appreciated.

Matthew
On Jun 27, 2014, at 3:45 AM, Rifat Shahriyar <rifat.shahriyar@anu.edu.au> wrote:

Hi,
The attached patch (can be applied on the current tip) demonstrate how to read/write misc header when an object is created. It may help you.

Regards
-
Rifat
Australian National University


On 27/06/2014 1:30 am, Matthew Ma wrote:
Hi,
I want to write information into Object Header's Misc field when an object is created: modify where RVM create new object (and its hearde)

eg. From the user annotated program, I want to write group information into the object header (ast and bst all refers to Tree object but each would have different Group number written into the object header)

1 @create(“Group1”) //GroupInformation
2 public void foo(){
3 ast = new Tree();
4 }

5 @create(“Group2”) ////GroupInformation
6 public void foo(){
7 bst = new Tree();
8 }

I looked into the option of changing the RVM to handle this mechanism when object created, but from RVMClass, I could’t find direct connection to how to access MiscHeader class.
In ObjectModel.java, I saw MiscHeader is invoked with initializeHeader(..) at allocateScalar. is it where I can write GroupInformation into the misc header field (by using RVMClass to get current running RVMMethod, and use getAnnotation() to obtain the annotated Group Information)?

Thanks,

Matthew




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