[Bug debug/27672] New: C frontend does not generate line information for multi-line conditions

[Bug debug/27672] New: C frontend does not generate line information for multi-line conditions

[drow at gcc dot gnu dot org]

Compile something like this with debugging information:

  if (func1 ()
      || func2 ()
      || func3 ())

Set a breakpoint on func1, and then use GDB's "finish" command to leave the
function.  You'll be back on the first line of the if.  Same if you finish from
func2.  Nothing in the process of parsing a conditional expression sets
expression locations for individual parts of the expression.

We do set a line number on the outer compound expression, and that points at
the beginning.  It would be strange to single-step onto the conditional jump
instruction and be taken back to the top of the "if".  So this may not be a
straightforward fix.


-- 
           Summary: C frontend does not generate line information for multi-
                    line conditions
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: drow at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27672

[Bug debug/27672] C frontend does not generate line information for multi-line conditions

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2006-05-18 21:38 -------
I have seen this also.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27672

[Bug debug/27672] C frontend does not generate line information for multi-line conditions

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2006-05-22 09:11 -------
Confirmed.  I don't like this, too.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2006-05-22 09:11:25
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27672

[Bug debug/27672] C frontend does not generate line information for multi-line conditions

[tromey at gcc dot gnu dot org]

------- Comment #3 from tromey at gcc dot gnu dot org  2009-12-14 16:26 -------
This seems to work better with svn trunk:

Breakpoint 2, func2 () at pr.c:5
5         return 0;
(gdb) fini
Run till exit from #0  func2 () at pr.c:5
0x080483c3 in main () at pr.c:13
13            || func2 ()
Value returned is $3 = 0
(gdb) s
14            || func3 ())
(gdb) s
func3 () at pr.c:8
8         return 1;
(gdb) fini
Run till exit from #0  func3 () at pr.c:8
0x080483cc in main () at pr.c:14
14            || func3 ())
Value returned is $4 = 1
(gdb) s
15          return 0;


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27672