* please help about garbage collector.
@ 2010-12-02 9:10 alin soare
2010-12-02 15:46 ` Andreas Schwab
0 siblings, 1 reply; 6+ messages in thread
From: alin soare @ 2010-12-02 9:10 UTC (permalink / raw
To: emacs-devel
/* When scanning the C stack for live Lisp objects, Emacs keeps track
of what memory allocated via lisp_malloc is intended for what
purpose. This enumeration specifies the type of memory. */
Could you explain me what kind of Lisp Objects are keps on the stack ? What kind
of Lisp objects are kept on the stack ?
Where and why such objects are allocated ?
Thanks.
Alin.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: please help about garbage collector.
2010-12-02 9:10 please help about garbage collector alin soare
@ 2010-12-02 15:46 ` Andreas Schwab
2010-12-02 15:49 ` Alin Soare
0 siblings, 1 reply; 6+ messages in thread
From: Andreas Schwab @ 2010-12-02 15:46 UTC (permalink / raw
To: alin soare; +Cc: emacs-devel
alin soare <as1789@gmail.com> writes:
> Could you explain me what kind of Lisp Objects are keps on the stack ?
Anything in automatic varables that the compiler puts there.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: please help about garbage collector.
2010-12-02 15:46 ` Andreas Schwab
@ 2010-12-02 15:49 ` Alin Soare
2010-12-02 16:00 ` Andreas Schwab
2010-12-02 23:15 ` Stefan Monnier
0 siblings, 2 replies; 6+ messages in thread
From: Alin Soare @ 2010-12-02 15:49 UTC (permalink / raw
To: Andreas Schwab; +Cc: emacs-devel
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> > Could you explain me what kind of Lisp Objects are keps on the stack ?
>
> Anything in automatic varables that the compiler puts there.
>
How can you detect that at a given address on the stack there is a lisp
object, and not something else ?
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: please help about garbage collector.
2010-12-02 15:49 ` Alin Soare
@ 2010-12-02 16:00 ` Andreas Schwab
2010-12-03 7:27 ` Alin Soare
2010-12-02 23:15 ` Stefan Monnier
1 sibling, 1 reply; 6+ messages in thread
From: Andreas Schwab @ 2010-12-02 16:00 UTC (permalink / raw
To: Alin Soare; +Cc: emacs-devel
Alin Soare <as1789@gmail.com> writes:
> How can you detect that at a given address on the stack there is a lisp
> object, and not something else ?
By heuristic. Read about conservative garbage collection in your
favorite text book.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: please help about garbage collector.
2010-12-02 15:49 ` Alin Soare
2010-12-02 16:00 ` Andreas Schwab
@ 2010-12-02 23:15 ` Stefan Monnier
1 sibling, 0 replies; 6+ messages in thread
From: Stefan Monnier @ 2010-12-02 23:15 UTC (permalink / raw
To: Alin Soare; +Cc: Andreas Schwab, emacs-devel
>> > Could you explain me what kind of Lisp Objects are keps on the stack ?
>> Anything in automatic varables that the compiler puts there.
> How can you detect that at a given address on the stack there is a lisp
> object, and not something else ?
You can't, but we do it anyway. It's called "conservative stack scanning".
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: please help about garbage collector.
2010-12-02 16:00 ` Andreas Schwab
@ 2010-12-03 7:27 ` Alin Soare
0 siblings, 0 replies; 6+ messages in thread
From: Alin Soare @ 2010-12-03 7:27 UTC (permalink / raw
To: Andreas Schwab, Stefan Monnier; +Cc: emacs-devel
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> How can you detect that at a given address on the stack there is a lisp
> > object, and not something else ?
>
> By heuristic. Read about conservative garbage collection in your
> favorite text book.
>
>
Very interesting... I did not know about this kind of algorithm.
Thanks a lot.
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2010-12-03 7:27 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2010-12-02 9:10 please help about garbage collector alin soare
2010-12-02 15:46 ` Andreas Schwab
2010-12-02 15:49 ` Alin Soare
2010-12-02 16:00 ` Andreas Schwab
2010-12-03 7:27 ` Alin Soare
2010-12-02 23:15 ` Stefan Monnier
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