remove using_exec_ops global

This removes the using_exec_ops global from exec.c, in favor of
querying the target stack directly using target_is_pushed.  This is
more in keeping with other code in gdb, and is also more future-proof
as it is more multi-target-ready.

Built and regtested on x86-64 Fedora 20.

2014-07-25  Tom Tromey  <tromey@redhat.com>

	* exec.c (using_exec_ops): Remove.
	(exec_close_1): Update.  Remove extraneous block, reindent.
	(add_target_sections): Use target_is_pushed.

1 files changed, 11 insertions, 21 deletions

diff --git a/gdb/exec.c b/gdb/exec.c
index 7ba2720..8b6f588 100644
--- a/gdb/exec.c
+++ b/gdb/exec.c
@@ -63,9 +63,6 @@ void _initialize_exec (void);
 
 static struct target_ops exec_ops;
 
-/* True if the exec target is pushed on the stack.  */
-static int using_exec_ops;
-
 /* Whether to open exec and core files read-only or read-write.  */
 
 int write_files = 0;
@@ -115,22 +112,18 @@ exec_close (void)
 static void
 exec_close_1 (struct target_ops *self)
 {
-  using_exec_ops = 0;
+  struct program_space *ss;
+  struct cleanup *old_chain;
 
+  old_chain = save_current_program_space ();
+  ALL_PSPACES (ss)
   {
-    struct program_space *ss;
-    struct cleanup *old_chain;
-
-    old_chain = save_current_program_space ();
-    ALL_PSPACES (ss)
-    {
-      set_current_program_space (ss);
-      clear_section_table (current_target_sections);
-      exec_close ();
-    }
-
-    do_cleanups (old_chain);
+    set_current_program_space (ss);
+    clear_section_table (current_target_sections);
+    exec_close ();
   }
+
+  do_cleanups (old_chain);
 }
 
 void
@@ -445,11 +438,8 @@ add_target_sections (void *owner,
 
       /* If these are the first file sections we can provide memory
 	 from, push the file_stratum target.  */
-      if (!using_exec_ops)
-	{
-	  using_exec_ops = 1;
-	  push_target (&exec_ops);
-	}
+      if (!target_is_pushed (&exec_ops))
+	push_target (&exec_ops);
     }
 }