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Re: V3 ABI

To: Bryce McKinlay <bryce at albatross dot co dot nz>
Subject: Re: V3 ABI
From: Tom Tromey <tromey at cygnus dot com>
Date: 30 Nov 2000 21:54:22 -0700
Cc: apbianco at cygnus dot com, java-discuss at sourceware dot cygnus dot com
References: <OFD15F4B7E.B69F46AA-ON882569A7.007B49F4@diversifiedsoftware.com> <877l5lt2b9.fsf@creche.cygnus.com> <3A27205A.46C9F39E@albatross.co.nz>
Reply-To: tromey at cygnus dot com

>>>>> "Bryce" == Bryce McKinlay <bryce@albatross.co.nz> writes:

Bryce> Any thoughts on how bitmap marking is going to work with the V3
Bryce> ABI? I think we'll have to move the class descriptor to the
Bryce> class object itself, since there wont be a convenient vtable
Bryce> slot, afaik. This means changes to the GC...

This is Alex's call.

One option might be to put the bitmap and the class pointer at offsets
-1 and -2.

Another would be to add dummy virtual functions to Object whose slots
would then be abused to hold the extra info.  This is relatively ugly.

Tom

References:
- Re: build error (2)
  - From: Tom.Williams
- Re: build error (2)
  - From: Tom Tromey
- Re: V3 ABI
  - From: Bryce McKinlay

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