Re: [patch] Set bfd field in target_section

[Pedro Alves <pedro at codesourcery dot com>]

On Tuesday 28 July 2009 15:34:41, Pedro Alves wrote:
> On Tuesday 28 July 2009 15:28:33, Aleksandar Ristovski wrote:
> > Hello,
> > 
> > I believe this is related to Pedro's patch from 03-Jun-09. I 
> > didn't see where we set target_section.bfd field - maybe I 
> > am overlooking something, but in bfd-target, in function 
> > target_bfd_xclose we will call bfd_close 
> > (table->sections->bfd); bfd_close doesn't like NULL argument.
> > 
> > Am I missing something, or is this (the patch) missing?
> 
> Doesn't add_to_section_table set the bfd in each new
> target section?

I think you've got yourself an executable without any ALLOC
section, hence the section table ends up empty.  I think something
like this will fix the problem.  I'll give a test spin and
apply it.

-- 
Pedro Alves

---
 gdb/bfd-target.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

Index: src/gdb/bfd-target.c
===================================================================
--- src.orig/gdb/bfd-target.c	2009-07-28 15:43:27.000000000 +0100
+++ src/gdb/bfd-target.c	2009-07-28 15:47:33.000000000 +0100
@@ -54,7 +54,10 @@ static void
 target_bfd_xclose (struct target_ops *t, int quitting)
 {
   struct target_section_table *table = t->to_data;
-  if (table->sections)
+
+  /* If the target sections table is empty, the bfd had already been
+     closed.  */
+  if (table->sections != table->sections_end)
     bfd_close (table->sections->bfd);
   xfree (table->sections);
   xfree (table);
@@ -70,6 +73,12 @@ target_bfd_reopen (struct bfd *bfd)
   table = XZALLOC (struct target_section_table);
   build_section_table (bfd, &table->sections, &table->sections_end);
 
+  /* No use keeping the bfd open if there are no target sections we
+     care about.  This way, we avoid keeping the bfd pointer stored
+     somewhere so that target_bfd_xclose could use it.  */
+  if (table->sections == table->sections_end)
+    bfd_close (bfd);
+
   t = XZALLOC (struct target_ops);
   t->to_shortname = "bfd";
   t->to_longname = _("BFD backed target");