convert to_get_unwinder and to_get_tailcall_unwinder to methods

This converts to_get_unwinder and to_get_tailcall_unwinder to methods
and arranges for them to use the new delegation scheme.

This just lets us avoid having a differing style (neither new-style
nor INHERIT) of delegation in the tree.

2014-02-19  Tom Tromey  <tromey@redhat.com>

	* target.c (target_get_unwinder): Rewrite.
	(target_get_tailcall_unwinder): Rewrite.
	* record-btrace.c (record_btrace_to_get_unwinder): New function.
	(record_btrace_to_get_tailcall_unwinder): New function.
	(init_record_btrace_ops): Update.
	* target.h (struct target_ops) <to_get_unwinder,
	to_get_tailcall_unwinder>: Now function pointers.  Use
	TARGET_DEFAULT_RETURN.

1 files changed, 2 insertions, 14 deletions

diff --git a/gdb/target.c b/gdb/target.c
index 911c279..4adc094 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -3822,13 +3822,7 @@ debug_to_prepare_to_store (struct target_ops *self, struct regcache *regcache)
 const struct frame_unwind *
 target_get_unwinder (void)
 {
-  struct target_ops *t;
-
-  for (t = current_target.beneath; t != NULL; t = t->beneath)
-    if (t->to_get_unwinder != NULL)
-      return t->to_get_unwinder;
-
-  return NULL;
+  return current_target.to_get_unwinder (&current_target);
 }
 
 /* See target.h.  */
@@ -3836,13 +3830,7 @@ target_get_unwinder (void)
 const struct frame_unwind *
 target_get_tailcall_unwinder (void)
 {
-  struct target_ops *t;
-
-  for (t = current_target.beneath; t != NULL; t = t->beneath)
-    if (t->to_get_tailcall_unwinder != NULL)
-      return t->to_get_tailcall_unwinder;
-
-  return NULL;
+  return current_target.to_get_tailcall_unwinder (&current_target);
 }
 
 /* Default implementation of to_decr_pc_after_break.  */