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Re: Finding objects on C stack - alternate GCPRO

From: Helmut Eller
Subject: Re: Finding objects on C stack - alternate GCPRO
Date: Wed, 16 Nov 2011 11:18:16 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.91 (gnu/linux)

* Dmitry Antipov [2011-11-16 10:07] writes:

> Everyone agrees that GGPROs are ugly and painful. On the other side,
> current C stack marking code introduces substantial overhead by
> maintaining red-black tree. And, since C stack marking is
> conservative, it becomes very tricky to implement GC that may
> relocate live objects (copying or compacting approach).
> But there is another method to implement GCPROs. It looks not very
> portable beyond GNU C since it uses __attribute__ ((cleanup (function)))
> and compound statement expressions C extensions. But it doesn't
> require UNGCPRO and dumbs like 'struct gcpro gcpro1, struct gcpro2, ...'.
> And I believe it should work across longjmps.

And we could use C++ with destructors.


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