public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug analyzer/94355] support for C++ new expression
Date: Sat, 05 Nov 2022 16:44:13 +0000 [thread overview]
Message-ID: <bug-94355-4-kh6PU92xTr@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-94355-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94355
--- Comment #13 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #10)
[...snip...]
> As already noted above, new can't return null here, and there is no
> dereference anyway. And the pointer isn't leaked, but it seems maybe the
> analyzer doesn't know about destructors?
FWIW the analyzer (presumably incorrectly) considers the case where operator
new returns NULL, and then attempts to write 0 to it.
The leak is due to the analyzer (presumably incorrectly) following the EH cfg
edge from BB 2 to BB 5 below.
int main ()
{
struct S s;
int D.2800;
int _5;
<bb 2> :
S::S (&s);
<bb 3> :
S::~S (&s);
s ={v} {CLOBBER(eol)};
_5 = 0;
<bb 4> :
<L0>:
return _5;
<bb 5> :
<L1>:
s ={v} {CLOBBER(eol)};
resx 1
}
next prev parent reply other threads:[~2022-11-05 16:44 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-27 11:36 [Bug analyzer/94355] New: " vanyacpp at gmail dot com
2020-03-27 11:59 ` [Bug analyzer/94355] " redi at gcc dot gnu.org
2020-09-09 21:24 ` cvs-commit at gcc dot gnu.org
2020-09-09 21:44 ` dmalcolm at gcc dot gnu.org
2020-09-09 21:50 ` dmalcolm at gcc dot gnu.org
2020-09-26 1:35 ` cvs-commit at gcc dot gnu.org
2021-04-12 7:46 ` vanyacpp at gmail dot com
2021-04-12 8:04 ` vanyacpp at gmail dot com
2021-07-22 21:14 ` navarre.gcc.bugs at gmail dot com
2021-07-22 21:35 ` redi at gcc dot gnu.org
2022-11-05 9:21 ` redi at gcc dot gnu.org
2022-11-05 9:28 ` redi at gcc dot gnu.org
2022-11-05 9:59 ` redi at gcc dot gnu.org
2022-11-05 16:44 ` dmalcolm at gcc dot gnu.org [this message]
2022-11-05 21:31 ` redi at gcc dot gnu.org
2023-06-29 20:01 ` [Bug analyzer/94355] analyzer " vultkayn at gcc dot gnu.org
2023-09-01 20:06 ` cvs-commit at gcc dot gnu.org
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=bug-94355-4-kh6PU92xTr@http.gcc.gnu.org/bugzilla/ \
--to=gcc-bugzilla@gcc.gnu.org \
--cc=gcc-bugs@gcc.gnu.org \
/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).