Speed up objdump when displaying disassembly mixed with line number and source code information.

bfd	* dwarf2.c (lookup_address_in_function_table): Return early if
	there are no functions in the given comp unit, or if the high
	address of the last function in the comp unit is less than the
	desired address.

binutils * objdump.c (display_file): Add new parameter 'last_file'.  If
	last_file is true, do not call bfd_close at the end of the
	function.
	(main): Set the value of the last_file parameter when calling
	display_file.

2 files changed, 26 insertions, 4 deletions

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index b5e82fe..a37f56c 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,11 @@
+2017-01-09  Nick Clifton  <nickc@redhat.com>
+
+	* objdump.c (display_file): Add new parameter 'last_file'.  If
+	last_file is true, do not call bfd_close at the end of the
+	function.
+	(main): Set the value of the last_file parameter when calling
+	display_file.
+
 2017-01-09  Alan Modra  <amodra@gmail.com>
 
 	* readelf.c (process_section_headers): Correct .rel.dyn/.rela.dyn
diff --git a/binutils/objdump.c b/binutils/objdump.c
index f61968b..c03dfc5 100644
--- a/binutils/objdump.c
+++ b/binutils/objdump.c
@@ -3616,7 +3616,7 @@ display_any_bfd (bfd *file, int level)
 }
 
 static void
-display_file (char *filename, char *target)
+display_file (char *filename, char *target, bfd_boolean last_file)
 {
   bfd *file;
 
@@ -3635,7 +3635,18 @@ display_file (char *filename, char *target)
 
   display_any_bfd (file, 0);
 
-  bfd_close (file);
+  /* This is an optimization to improve the speed of objdump, especially when
+     dumping a file with lots of associated debug informatiom.  Calling
+     bfd_close on such a file can take a non-trivial amount of time as there
+     are lots of lists to walk and buffers to free.  This is only really
+     necessary however if we are about to load another file and we need the
+     memory back.  Otherwise, if we are about to exit, then we can save (a lot
+     of) time by only doing a quick close, and allowing the OS to reclaim the
+     memory for us.  */
+  if (! last_file)
+    bfd_close (file);
+  else
+    bfd_close_all_done (file);
 }
 
 int
@@ -3913,10 +3924,13 @@ main (int argc, char **argv)
   else
     {
       if (optind == argc)
-	display_file ("a.out", target);
+	display_file ("a.out", target, TRUE);
       else
 	for (; optind < argc;)
-	  display_file (argv[optind++], target);
+	  {
+	    display_file (argv[optind], target, optind == argc - 1);
+	    optind++;
+	  }
     }
 
   free_only_list ();