From: Alexandre Oliva <aoliva@redhat.com>
To: Jim Blandy <jimb@redhat.com>
Cc: Richard Henderson <rth@redhat.com>,
Andrew Cagney <ac131313@redhat.com>,
Mark Kettenis <kettenis@chello.nl>,
mludvig@suse.cz, gdb@sources.redhat.com
Subject: Re: dwarf-frame.c question
Date: Tue, 03 Jun 2003 20:12:00 -0000 [thread overview]
Message-ID: <orof1eq5td.fsf@free.redhat.lsd.ic.unicamp.br> (raw)
In-Reply-To: <vt2fzmrpt9b.fsf@zenia.red-bean.com>
On Jun 3, 2003, Jim Blandy <jimb@redhat.com> wrote:
> So, if a function never returns, why not have the compiler emit CFI
> that restores the state just *before* the call insn was executed,
> not after it returns?
In some ABIs, the callee releases (part of) the stack space allocated
by the caller, so the state is actually different. I.e., the state
before the call is significantly different from the state after the
return, which is also different from the state during the call. I'm
not sure whether it would actually matter for GDB, but that's why I
thought we'd be better off taking the CFI from after the call (even if
it's not meaningful given that the call doesn't return), instead of
from before it.
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist Professional serial bug killer
next prev parent reply other threads:[~2003-06-03 20:12 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-27 15:19 Michal Ludvig
2003-05-29 15:44 ` Mark Kettenis
2003-05-29 19:54 ` Andrew Cagney
2003-05-29 22:22 ` Mark Kettenis
2003-05-29 22:43 ` Michal Ludvig
2003-05-29 23:13 ` Andrew Cagney
2003-05-30 1:34 ` Daniel Jacobowitz
2003-05-30 20:21 ` Jim Blandy
2003-05-30 20:21 ` Jim Blandy
2003-05-30 20:32 ` Andrew Cagney
2003-06-03 0:04 ` Jim Blandy
2003-06-03 5:47 ` Richard Henderson
2003-06-03 6:32 ` Jim Blandy
2003-06-03 15:58 ` Richard Henderson
2003-06-03 17:38 ` Richard Henderson
2003-06-03 20:12 ` Alexandre Oliva [this message]
2003-05-30 20:44 ` Alexandre Oliva
2003-06-01 5:59 Richard Henderson
2003-06-01 10:00 ` Mark Kettenis
2003-06-02 20:34 ` Richard Henderson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=orof1eq5td.fsf@free.redhat.lsd.ic.unicamp.br \
--to=aoliva@redhat.com \
--cc=ac131313@redhat.com \
--cc=gdb@sources.redhat.com \
--cc=jimb@redhat.com \
--cc=kettenis@chello.nl \
--cc=mludvig@suse.cz \
--cc=rth@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).