Adding a new imediate type
bert at impara.de
Mon Jan 2 16:33:32 UTC 2006
Hans-Martin did that back in 97:
- Bert -
Am 02.01.2006 um 12:51 schrieb Peter Crowther:
>> From: [...] Joerg Beekmann
>> Can anyone comment on how much work would be involved in
>> 1) Adding a new 32bit field to the object header
> Nasty. I tried it back in the 2.2 days, and failed. My biggest
> was getting the garbage collector stable.
>> 2) Adding a new immediate type like integer, presumable by adding
>> another tag bit.
> Also nasty - there aren't any more tag bits, and tweaking with the
> header format also involves the GC. If you're going to do this,
> look at
> the compact classes instead and see whether you can make yours
> Last I looked, I think there were a couple of spares. Note that
> to compact classes did *not* involve image format or VM changes last I
>> Do these tasks involve
>> tracking down a bunch of constants and then rebuilding everything,
>> tedious but a with a known path to follow. Or will this
>> involve much more.
> Much, much more.
> - Peter
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