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bug#12215: CSET is unnecessarily confusing
From: |
Stefan Monnier |
Subject: |
bug#12215: CSET is unnecessarily confusing |
Date: |
Thu, 23 Aug 2012 08:26:27 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.2.50 (gnu/linux) |
> True in both cases. I suppose the notation could grow on one.
Yes, I didn't like it much when I first thought about it, but I'm
beginning to think it's the least bad option (the next one is to use
another preprocessor than cpp ;-).
> Second, why does the setter need the pointer to the start of
> the object, as well as a pointer to the field that's changing?
Depends on how the write barrier works; more specifically, depends on
where the write-barrier writes the "this was modified" info. One choice
is to have a flag in the object (like gcmarkbit) that says "this object
was modified since last scan"; and for that you need a pointer to the
start of the object rather than only to the field.
Of course, there are also many other choices which don't require such
a pointer (e.g. you can add the field's address to a list of "modified
fields"; or you can have a flag covering all objects in a "page", ...).
Stefan
- bug#12215: CSET is unnecessarily confusing, Paul Eggert, 2012/08/16
- bug#12215: CSET is unnecessarily confusing, Dmitry Antipov, 2012/08/17
- bug#12215: CSET is unnecessarily confusing, Stefan Monnier, 2012/08/21
- bug#12215: CSET is unnecessarily confusing, Stefan Monnier, 2012/08/21
- bug#12215: CSET is unnecessarily confusing, Paul Eggert, 2012/08/21
- bug#12215: CSET is unnecessarily confusing,
Stefan Monnier <=
- bug#12215: CSET is unnecessarily confusing, Paul Eggert, 2012/08/23
- bug#12215: CSET is unnecessarily confusing, Chong Yidong, 2012/08/23
- bug#12215: CSET is unnecessarily confusing, Paul Eggert, 2012/08/23
- bug#12215: CSET is unnecessarily confusing, Dmitry Antipov, 2012/08/24
- bug#12215: CSET is unnecessarily confusing, Stefan Monnier, 2012/08/24
- bug#12215: CSET is unnecessarily confusing, Paul Eggert, 2012/08/24
- bug#12215: CSET is unnecessarily confusing, Tom Tromey, 2012/08/24
- bug#12215: CSET is unnecessarily confusing, Paul Eggert, 2012/08/24
- bug#12215: CSET is unnecessarily confusing, Stefan Monnier, 2012/08/24
- bug#12215: CSET is unnecessarily confusing, Paul Eggert, 2012/08/24