[Bug debug/32444] New: missing debug information for structure components

[Bug debug/32444] New: missing debug information for structure components

[geoffk at gcc dot gnu dot org]

Given the following short program,

struct pt
{
  int x, y;
};

struct pt sum(struct pt *p)
{
  struct pt tmp = { 0, 0 };
  int i;
  for (i = 0; i < 100; i++)
    {
      tmp.x += p[i].x;
      tmp.y += p[i].y;
    }
  return tmp;
}

on powerpc-darwin, built with -O2, I see that the main loop is storing tmp.x in
r8 and tmp.y in r10 (or possibly the other way around).  Yet, the debug
information contains no location information for 'tmp'.  A similar thing
happens on i386-darwin where the values are stored in eax and edx.

Also, on i386-darwin, 'i' is also not present in the debug information,
although it is in %ecx.

L2:
        addl    -8(%esi,%ecx,8), %eax
        addl    -4(%esi,%ecx,8), %edx
        addl    $1, %ecx
        cmpl    $101, %ecx
        jne     L2


-- 
           Summary: missing debug information for structure components
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: geoffk at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32444

[Bug debug/32444] missing debug information for structure components

[geoffk at gcc dot gnu dot org]

------- Comment #1 from geoffk at gcc dot gnu dot org  2007-06-21 01:08 -------
Happens even with -O1.  One of the causes is SRA, but there's more...


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32444

[Bug debug/32444] missing debug information for structure components

[geoffk at gcc dot gnu dot org]

------- Comment #2 from geoffk at gcc dot gnu dot org  2007-06-21 01:13 -------
The problem with 'i' is ivopts.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32444

[Bug debug/32444] missing debug information for structure components

[geoffk at gcc dot gnu dot org]

------- Comment #3 from geoffk at gcc dot gnu dot org  2007-06-21 01:24 -------
I split out the problem with 'i' to PR 32445.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32444

[Bug debug/32444] missing debug information for structure components with optimized code

[pinskia at gcc dot gnu dot org]

------- Comment #4 from pinskia at gcc dot gnu dot org  2007-06-21 09:01 -------
First temp is SRA'd so the debugging info should be correct unless tracking is
wrong.  Second iv-opts is messing up the debuging info for i by creating a new
variable.

I think this is a feature we would like to support but is not something we need
to support that well.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
            Summary|missing debug information   |missing debug information
                   |for structure components    |for structure components
                   |                            |with optimized code


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32444

[Bug debug/32444] missing debug information for structure components with optimized code

[pinskia at gcc dot gnu dot org]

------- Comment #5 from pinskia at gcc dot gnu dot org  2007-06-21 09:03 -------
Actually SRA should be ok, because we do keep tracking them on the tree level. 
Daniel Berlin added this code.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32444

[Bug debug/32444] missing debug information for structure components with optimized code

[pinskia at gcc dot gnu dot org]

------- Comment #6 from pinskia at gcc dot gnu dot org  2007-06-24 04:04 -------
http://gcc.gnu.org/ml/gcc/2005-01/msg00016.html


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32444