From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-473581-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 17248 invoked by alias); 16 Jan 2015 18:21:40 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 16939 invoked by uid 48); 16 Jan 2015 18:21:30 -0000
From: "joerg.richter@pdv-fs.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/64634] New: gcov reports catch(...) as not executed
Date: Fri, 16 Jan 2015 18:21:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: gcov-profile
X-Bugzilla-Version: 4.8.3
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: joerg.richter@pdv-fs.de
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter
Message-ID: <bug-64634-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2015-01/txt/msg01575.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64634

            Bug ID: 64634
           Summary: gcov reports catch(...) as not executed
           Product: gcc
           Version: 4.8.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joerg.richter@pdv-fs.de

cat > t.cc <<EOF
#include <cstdlib>
void catchEx()
{
  exit(0);
  try
  {}
  catch( int )
  {}
}

int main()
{
  try
  {
    throw 5;
  }
  catch(...)
  {
    catchEx();
  }
}
EOF

g++ -o t t.cc -O0 --coverage -g
./t

-----

If you now call gcov like this:
gcov -b t.gcda

t.cc.gcov looks like this:

...
    =====:   18:  catch(...)
call    0 never executed
call    1 never executed
call    2 returned 100%
call    3 never executed
...

But if you call gcov like this:
gcov -a -b t.gcda
Then t.cc.gcov looks like this:

...
        1:   18:  catch(...)
    %%%%%:   18-block  0
call    0 never executed
call    1 never executed
    1:   18-block  1
    1:   18-block  2
call    2 returned 100%
    %%%%%:   18-block  3
call    3 never executed
...

Note that in the former case the catch(...) on line 18 is 
marked as not executed and in the later it is marked as 
executed. This results in wrong coverage information.

Calling gcov always with -a is no option for us. Because
gcov -a is much slower.

Works with GCC 4.4.4.  Fails since 4.5.