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From "weldon washburn (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HARMONY-1785) [drlvm][.jet] wb4c - write barriers for C/C++-based GC
Date Mon, 09 Oct 2006 16:22:21 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-1785?page=all ]

weldon washburn reassigned HARMONY-1785:
----------------------------------------

    Assignee: weldon washburn

> [drlvm][.jet] wb4c - write barriers for C/C++-based GC
> ------------------------------------------------------
>
>                 Key: HARMONY-1785
>                 URL: http://issues.apache.org/jira/browse/HARMONY-1785
>             Project: Harmony
>          Issue Type: New Feature
>          Components: DRLVM
>            Reporter: Alex Astapchuk
>         Assigned To: weldon washburn
>         Attachments: jet_wb4c.patch
>
>
> Attached is implementation of write barriers for C/C++ based GCs (WB4C) in Jitrino.JET.
> Currently, the GC's function gc_heap_slot_write_ref (file vm\gc\src\gc_for_vm.cpp) 
> is used as write barrier helper.
> WB4C is off by default. To turn it on pass 'wb4c=true' option to .jet. Please refer to

> PMF docs for details on how the arguments passing is working currently.
> Normally, if you're using .jet-only mode (java -Xem:jet), the complete command line is
> java -Xem:jet -Djit.JET.arg.wb4c=true Hello
> Note: by default, the static fields writes (PUTSTATIC opcode) are *NOT* reported. 
> This is due to specifics of DRLVM where the static fields lies outside of the managed
heap.
> To force the reporting of static fields pass 'wb4c.skip_statics=false' (only works 
> together with wb4c=true):
> java -Xem:jet -Djit.JET.arg.wb4c=true -Djit.JET.arg.wb4c.skip_statics=false Hello
> (Note: current implementaion of gc_heap_slot_write_ref() will raise assert() in this
case).
> This patch also prepares some stuff for write barriers for Java (wb4j) but the complete

> implementaion of wb4j will be supplied later.

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