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From "Alex Astapchuk (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-1785) [drlvm][.jet] wb4c - write barriers for C/C++-based GC
Date Mon, 09 Oct 2006 14:41:19 GMT
[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
         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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