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.

gdb/ChangeLog

@@ -1,3 +1,13 @@
+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.
+
 2018-04-30  Tom Tromey  <tom@tromey.com>
 
 	* common/gdb_ref_ptr.h (ref_ptr::new_reference): New static

gdb/exec.c

@@ -246,7 +246,7 @@ exec_file_attach (const char *filename, int from_tty)
   /* First, acquire a reference to the current exec_bfd.  We release
      this at the end of the function; but acquiring it now lets the
      BFD cache return it if this call refers to the same file.  */
-  gdb_bfd_ref_ptr exec_bfd_holder = new_bfd_ref (exec_bfd);
+  gdb_bfd_ref_ptr exec_bfd_holder = gdb_bfd_ref_ptr::new_reference (exec_bfd);
 
   /* Remove any previous exec file.  */
   exec_close ();

gdb/gdb_bfd.c

@@ -450,7 +450,7 @@ gdb_bfd_open (const char *name, const char *target, int fd)
 			    host_address_to_string (abfd),
 			    bfd_get_filename (abfd));
       close (fd);
-      return new_bfd_ref (abfd);
+      return gdb_bfd_ref_ptr::new_reference (abfd);
     }
 
   abfd = bfd_fopen (name, target, FOPEN_RB, fd);
@@ -470,7 +470,7 @@ gdb_bfd_open (const char *name, const char *target, int fd)
       *slot = abfd;
     }
 
-  return new_bfd_ref (abfd);
+  return gdb_bfd_ref_ptr::new_reference (abfd);
 }
 
 /* A helper function that releases any section data attached to the
@@ -781,7 +781,7 @@ gdb_bfd_fopen (const char *filename, const char *target, const char *mode,
 {
   bfd *result = bfd_fopen (filename, target, mode, fd);
 
-  return new_bfd_ref (result);
+  return gdb_bfd_ref_ptr::new_reference (result);
 }
 
 /* See gdb_bfd.h.  */
@@ -791,7 +791,7 @@ gdb_bfd_openr (const char *filename, const char *target)
 {
   bfd *result = bfd_openr (filename, target);
 
-  return new_bfd_ref (result);
+  return gdb_bfd_ref_ptr::new_reference (result);
 }
 
 /* See gdb_bfd.h.  */
@@ -801,7 +801,7 @@ gdb_bfd_openw (const char *filename, const char *target)
 {
   bfd *result = bfd_openw (filename, target);
 
-  return new_bfd_ref (result);
+  return gdb_bfd_ref_ptr::new_reference (result);
 }
 
 /* See gdb_bfd.h.  */
@@ -826,7 +826,7 @@ gdb_bfd_openr_iovec (const char *filename, const char *target,
 				 open_func, open_closure,
 				 pread_func, close_func, stat_func);
 
-  return new_bfd_ref (result);
+  return gdb_bfd_ref_ptr::new_reference (result);
 }
 
 /* See gdb_bfd.h.  */
@@ -871,7 +871,7 @@ gdb_bfd_record_inclusion (bfd *includer, bfd *includee)
   struct gdb_bfd_data *gdata;
 
   gdata = (struct gdb_bfd_data *) bfd_usrdata (includer);
-  gdata->included_bfds.push_back (new_bfd_ref (includee));
+  gdata->included_bfds.push_back (gdb_bfd_ref_ptr::new_reference (includee));
 }
 
 /* See gdb_bfd.h.  */
@@ -881,7 +881,7 @@ gdb_bfd_fdopenr (const char *filename, const char *target, int fd)
 {
   bfd *result = bfd_fdopenr (filename, target, fd);
 
-  return new_bfd_ref (result);
+  return gdb_bfd_ref_ptr::new_reference (result);
 }
 
 

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);
 

gdb/symfile-mem.c

@@ -99,7 +99,7 @@ symbol_file_add_from_memory (struct bfd *templ, CORE_ADDR addr,
     error (_("Failed to read a valid object file image from memory."));
 
   /* Manage the new reference for the duration of this function.  */
-  gdb_bfd_ref_ptr nbfd_holder = new_bfd_ref (nbfd);
+  gdb_bfd_ref_ptr nbfd_holder = gdb_bfd_ref_ptr::new_reference (nbfd);
 
   xfree (bfd_get_filename (nbfd));
   if (name == NULL)