frame, backtrace: allow targets to supply a frame unwinder

Allow targets to supply their own target-specific frame unwinders; one for
normal frames and one for tailcall frames.  If a target-specific unwinder
is supplied, it will be chosen before any other unwinder.

The original patch has been split into this and the next two patches.

gdb/
2013-02-11  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* frame-unwind.c: Include target.h.
	(frame_unwind_try_unwinder): New function with code from ...
	(frame_unwind_find_by_frame): ... here.  New variable
	unwinder_from_target, call also target_get_unwinder)
	(target_get_tailcall_unwinder, and frame_unwind_try_unwinder for it.
	* target.c (target_get_unwinder, target_get_tailcall_unwinder): New.
	* target.h (struct target_ops): New fields to_get_unwinder and
	to_get_tailcall_unwinder.
	(target_get_unwinder, target_get_tailcall_unwinder): New declarations.

1 files changed, 28 insertions, 0 deletions

diff --git a/gdb/target.c b/gdb/target.c
index bfb0633..5e84288 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -4471,6 +4471,34 @@ debug_to_prepare_to_store (struct target_ops *self, struct regcache *regcache)
   fprintf_unfiltered (gdb_stdlog, "target_prepare_to_store ()\n");
 }
 
+/* See target.h.  */
+
+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;
+}
+
+/* See target.h.  */
+
+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;
+}
+
 static int
 deprecated_debug_xfer_memory (CORE_ADDR memaddr, bfd_byte *myaddr, int len,
 			      int write, struct mem_attrib *attrib,