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Re: Conservative GC isn't safe

From: Stefan Monnier
Subject: Re: Conservative GC isn't safe
Date: Mon, 28 Nov 2016 12:49:28 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

>> >> res = Fvector (ito - ifrom, aref_addr (string, ifrom));
>> > But 'string' still references the contents array of the vector, so GC
>> > will mark it when it comes to 'string'.
>> But after computing "aref_addr (string, ifrom)", it may very well be
>> that `string` is dead and the compiler may then decide not to write
>> it into the stack.
> It will still be there in the caller.

Only if the caller still needs it after the call.
That's usually the case, but it's not a given.


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