| From: | Greg Stark <stark(at)enterprisedb(dot)com> |
|---|---|
| To: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
| Cc: | Robert Lor <Robert(dot)Lor(at)sun(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Zdenek Kotala <Zdenek(dot)Kotala(at)sun(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: DTrace probes broken in HEAD on Solaris? |
| Date: | 2009-03-24 22:18:08 |
| Message-ID: | 4136ffa0903241518h9a2a442qfaaa7b8741a0fa65@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Mar 24, 2009 at 10:12 PM, Martijn van Oosterhout
<kleptog(at)svana(dot)org> wrote:
> Not really a GCC extension, but you could have the macro check that it
> can take the address of the arguments, which amounts to almost the same
> thing. It only doesn't work on constants.
No, there are all kinds of complex expressions which are lvalues --
anything ending in a pointer dereference for example, which is
precisely the most likely kind of expression to introduce seg fault if
something is unexpectedly null
.
--
greg
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