Remove new_bfd_ref

For gdb_bfd_ref_ptr, gdb already had a convenience function like the
new gdb_ref_ptr::new_reference -- called new_bfd_ref.  This patch
removes it in favor of the new common function.

While doing this I also noticed that the comment for gdb_bfd_open was
incorrect (in a way related to reference counting), so this patch
updates the comment as well.

ChangeLog
2018-04-30  Tom Tromey  <tom@tromey.com>

	* symfile-mem.c (symbol_file_add_from_memory): Use new_reference.
	* gdb_bfd.h (new_bfd_ref): Remove.
	(gdb_bfd_open): Update comment.
	* gdb_bfd.c (gdb_bfd_open, gdb_bfd_fopen, gdb_bfd_openr)
	(gdb_bfd_openw, gdb_bfd_openr_iovec, gdb_bfd_record_inclusion)
	(gdb_bfd_fdopenr): Use new_reference.
	* exec.c (exec_file_attach): Use new_reference.

1 files changed, 7 insertions, 18 deletions

diff --git a/gdb/gdb_bfd.h b/gdb/gdb_bfd.h
index 2e4ac2c..85300b9 100644
--- a/gdb/gdb_bfd.h
+++ b/gdb/gdb_bfd.h
@@ -68,27 +68,16 @@ struct gdb_bfd_ref_policy
 /* A gdb::ref_ptr that has been specialized for BFD objects.  */
 typedef gdb::ref_ptr<struct bfd, gdb_bfd_ref_policy> gdb_bfd_ref_ptr;
 
-/* A helper function that calls gdb_bfd_ref and returns a
-   gdb_bfd_ref_ptr.  */
-
-static inline gdb_bfd_ref_ptr
-new_bfd_ref (struct bfd *abfd)
-{
-  gdb_bfd_ref (abfd);
-  return gdb_bfd_ref_ptr (abfd);
-}
-
 /* Open a read-only (FOPEN_RB) BFD given arguments like bfd_fopen.
    If NAME starts with TARGET_SYSROOT_PREFIX then the BFD will be
    opened using target fileio operations if necessary.  Returns NULL
-   on error.  On success, returns a new reference to the BFD, which
-   must be freed with gdb_bfd_unref.  BFDs returned by this call are
-   shared among all callers opening the same file.  If FD is not -1,
-   then after this call it is owned by BFD.  If the BFD was not
-   accessed using target fileio operations then the filename
-   associated with the BFD and accessible with bfd_get_filename will
-   not be exactly NAME but rather NAME with TARGET_SYSROOT_PREFIX
-   stripped.  */
+   on error.  On success, returns a new reference to the BFD.  BFDs
+   returned by this call are shared among all callers opening the same
+   file.  If FD is not -1, then after this call it is owned by BFD.
+   If the BFD was not accessed using target fileio operations then the
+   filename associated with the BFD and accessible with
+   bfd_get_filename will not be exactly NAME but rather NAME with
+   TARGET_SYSROOT_PREFIX stripped.  */
 
 gdb_bfd_ref_ptr gdb_bfd_open (const char *name, const char *target, int fd);