gdb: Avoid unneeded calls to parse_frame_specification.

Within the stack command there are a couple of places where fixed
strings are passed into functions that are really intended for
processing user input.  These fixed strings are then processed and the
result returned.

Given that the input strings in these cases are fixed, and are always
"0", then the result will always be the same, the current frame.  By
switching to using get_current_frame instead the code can be simplified,
and the intention of the code is clearer.

gdb/ChangeLog:

	* stack.c (parse_frame_specification): Delete.
	(parse_frame_specification_1): Rename to
	parse_frame_specification.
	(frame_info): Use parse_frame_specification.
	(select_frame_command): Likewise.
	(return_command): Use select_frame and print_stack_frame rather
	than frame_command and select_frame_command.
	(func_command): Use get_current_frame rather than
	parse_frame_specification.

2 files changed, 19 insertions, 14 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 397b293..19bfc2e 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,17 @@
 2015-10-12  Andrew Burgess  <andrew.burgess@embecosm.com>
 
+	* stack.c (parse_frame_specification): Delete.
+	(parse_frame_specification_1): Rename to
+	parse_frame_specification.
+	(frame_info): Use parse_frame_specification.
+	(select_frame_command): Likewise.
+	(return_command): Use select_frame and print_stack_frame rather
+	than frame_command and select_frame_command.
+	(func_command): Use get_current_frame rather than
+	parse_frame_specification.
+
+2015-10-12  Andrew Burgess  <andrew.burgess@embecosm.com>
+
 	* stack.c (func_command): Return early when there is no ARG
 	string.
 
diff --git a/gdb/stack.c b/gdb/stack.c
index e7c7de9..e2b4dac 100644
--- a/gdb/stack.c
+++ b/gdb/stack.c
@@ -1280,8 +1280,8 @@ print_frame (struct frame_info *frame, int print_level,
    the default selected frame was used.  */
 
 static struct frame_info *
-parse_frame_specification_1 (const char *frame_exp, const char *message,
-			     int *selected_frame_p)
+parse_frame_specification (const char *frame_exp, const char *message,
+			   int *selected_frame_p)
 {
   int numargs;
   struct value *args[4];
@@ -1401,12 +1401,6 @@ parse_frame_specification_1 (const char *frame_exp, const char *message,
     error (_("Too many args in frame specification"));
 }
 
-static struct frame_info *
-parse_frame_specification (char *frame_exp)
-{
-  return parse_frame_specification_1 (frame_exp, NULL, NULL);
-}
-
 /* Print verbosely the selected frame or the frame at address
    ADDR_EXP.  Absolutely all information in the frame is printed.  */
 
@@ -1431,7 +1425,7 @@ frame_info (char *addr_exp, int from_tty)
   CORE_ADDR caller_pc = 0;
   int caller_pc_p = 0;
 
-  fi = parse_frame_specification_1 (addr_exp, "No stack.", &selected_frame_p);
+  fi = parse_frame_specification (addr_exp, "No stack.", &selected_frame_p);
   gdbarch = get_frame_arch (fi);
 
   /* Name of the value returned by get_frame_pc().  Per comments, "pc"
@@ -2284,7 +2278,7 @@ find_relative_frame (struct frame_info *frame, int *level_offset_ptr)
 void
 select_frame_command (char *level_exp, int from_tty)
 {
-  select_frame (parse_frame_specification_1 (level_exp, "No stack.", NULL));
+  select_frame (parse_frame_specification (level_exp, "No stack.", NULL));
 }
 
 /* The "frame" command.  With no argument, print the selected frame
@@ -2492,11 +2486,10 @@ return_command (char *retval_exp, int from_tty)
   if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
     frame_pop (get_current_frame ());
 
+  select_frame (get_current_frame ());
   /* If interactive, print the frame that is now current.  */
   if (from_tty)
-    frame_command ("0", 1);
-  else
-    select_frame_command ("0", 0);
+    print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
 }
 
 /* Sets the scope to input function name, provided that the function
@@ -2521,7 +2514,7 @@ func_command (char *arg, int from_tty)
   if (arg == NULL)
     return;
 
-  frame = parse_frame_specification ("0");
+  frame = get_current_frame ();
   sals = decode_line_with_current_source (arg, DECODE_LINE_FUNFIRSTLINE);
   cleanups = make_cleanup (xfree, sals.sals);
   func_bounds = XNEWVEC (struct function_bounds, sals.nelts);