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gdb: remove objfile parameter from get_objfile_bfd_data

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I noticed it was unused.  I think that makes sense, as it shows that
objfile_per_bfd_storage is not specific to one objfile (it can be shared
by multiple objfiles that have the same bfd).

There is one thing I wonder though, maybe I'm missing something.  If
the BFD doesn't require relocation, get_objfile_bfd_data stores the
newly allocated object in objfiles_bfd_data, so we can assume that
objfiles_bfd_data is the owner of the object.  When the bfd's refcount
drops to 0, the corresponding objfile_per_bfd_storage object in
objfiles_bfd_data is deleted.

But if the BFD requires relocation, get_objfile_bfd_data returns a newly
allocated object that isn't kept anywhere else (and isn't shared).  So
the objfile becomes the owner of the objfile_per_bfd_storage object.  In
objfile::~objfile, we have this:

    if (obfd)
      gdb_bfd_unref (obfd);
    else
      delete per_bfd;

I'm thinking that obfd could be non-nullptr, and it could require
relocation.  In that case, it would never be freed.  Anyway, that's not
really connected to this patch.

gdb/ChangeLog:

	* objfiles.c (get_objfile_bfd_data): Remove objfile parameter,
	adjust callers.

Change-Id: Ifa3158074ea6b42686780ba09d0c964b0cf14cf1
This commit is contained in:
Simon Marchi 2021-04-02 11:50:45 -04:00
parent 0072c87379
commit 9161c89ad8
2 changed files with 9 additions and 6 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2021-04-02 Simon Marchi <simon.marchi@polymtl.ca>
* objfiles.c (get_objfile_bfd_data): Remove objfile parameter,
adjust callers.
2021-04-02 Simon Marchi <simon.marchi@polymtl.ca>
* psympriv.h (struct partial_symtab) <partial_symtab>: Change

10
gdb/objfiles.c
View File

@ -120,12 +120,10 @@ objfile_per_bfd_storage::~objfile_per_bfd_storage ()
/* Create the per-BFD storage object for OBJFILE. If ABFD is not
NULL, and it already has a per-BFD storage object, use that.
Otherwise, allocate a new per-BFD storage object. Note that it is
not safe to call this multiple times for a given OBJFILE -- it can
only be called when allocating or re-initializing OBJFILE. */
Otherwise, allocate a new per-BFD storage object. */
static struct objfile_per_bfd_storage *
get_objfile_bfd_data (struct objfile *objfile, struct bfd *abfd)
get_objfile_bfd_data (bfd *abfd)
{
struct objfile_per_bfd_storage *storage = NULL;
@ -154,7 +152,7 @@ get_objfile_bfd_data (struct objfile *objfile, struct bfd *abfd)
void
set_objfile_per_bfd (struct objfile *objfile)
{
objfile->per_bfd = get_objfile_bfd_data (objfile, objfile->obfd);
objfile->per_bfd = get_objfile_bfd_data (objfile->obfd);
}
/* Set the objfile's per-BFD notion of the "main" name and
@ -363,7 +361,7 @@ objfile::objfile (bfd *abfd, const char *name, objfile_flags flags_)
build_objfile_section_table (this);
}
per_bfd = get_objfile_bfd_data (this, abfd);
per_bfd = get_objfile_bfd_data (abfd);
}
/* If there is a valid and known entry point, function fills *ENTRY_P with it