From: Jim Blandy <jimb@redhat.com>
To: Vladimir Prus <ghost@cs.msu.su>
Cc: gdb@sources.redhat.com
Subject: Re: frame_id question
Date: Fri, 11 Nov 2005 10:23:00 -0000 [thread overview]
Message-ID: <vt28xvv5vqj.fsf@theseus.home.> (raw)
In-Reply-To: <dkt7no$aan$1@sea.gmane.org> (Vladimir Prus's message of "Wed, 09 Nov 2005 19:22:16 +0300")
Vladimir Prus <ghost@cs.msu.su> writes:
> The question is: why frame id has to include program address at all? It it
> ever possible for two frames to have the same stack address? If so, when?
Some functions don't need any stack space at all. Such a function can
even call other functions if it moves the return address to a
callee-saved register while doing so. Unwinding through such a call,
the caller's frame will have the same CFA as the callee, but a
different function address. Since the two frame ID's have different
function addresses, frame_id_eq will declare them distinct, and GDB
won't complain that it has gotten stuck trying to unwind the stack.
next prev parent reply other threads:[~2005-11-11 10:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-09 16:29 Vladimir Prus
2005-11-11 10:23 ` Jim Blandy [this message]
2005-11-11 10:35 ` Vladimir Prus
[not found] ` <8f2776cb0511110943p1bb2b03g1b158fb8a82f2528@mail.gmail.com>
2005-11-11 18:05 ` Fwd: " Jim Blandy
2005-11-13 17:32 ` Daniel Jacobowitz
2005-11-13 23:34 ` Jim Blandy
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