[jira] Assigned: (HARMONY-1580) [DRLVM][JET]write barrier for JET

["weldon washburn (JIRA)" <ji...@apache.org>]

     [ http://issues.apache.org/jira/browse/HARMONY-1580?page=all ]

weldon washburn reassigned HARMONY-1580:
----------------------------------------

    Assignee: weldon washburn

> [DRLVM][JET]write barrier for JET
> ---------------------------------
>
>                 Key: HARMONY-1580
>                 URL: http://issues.apache.org/jira/browse/HARMONY-1580
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>         Environment: windows and linux on IA32
>            Reporter: Yu-Nan He
>         Assigned To: weldon washburn
>         Attachments: write_barrier_JET.patch
>
>
> Attached patch is an implementation of write barrier for JET compiler of DRLVM. The patch lets JET to call "gc_requires_barriers()" of GC to determine if it needs to insert the write barrier code into the jitted code, so it doesn't impact current DRLVM/GC at all. It calls gc_heap_slot_write_ref( ) of GC module, which takes three parameters. The signature is "void gc_heap_slot_write_ref (Managed_Object_Handle p_obj_holding_ref,Managed_Object_Handle *p_slot, Managed_Object_Handle p_target)". 
>  
> The patch is based on revision 442796. We hope it can be committed to Harmony soon because GCv5 will be depending on it. We don't use existing getaddress__gc_write_barrier_fastcall () in DRLVM because it only remembers object rather than the slot, and the name is not descriptive. But we may use it later. Thanks.

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