+/* Given THIS frame, return the frame base methods for THIS frame,
+ or NULL if it can't handle THIS frame. */
+
+typedef const struct frame_base *(frame_base_sniffer_ftype) (struct frame_info *this_frame);
+
+/* Append a frame base sniffer to the list. The sniffers are polled
+ in the order that they are appended. */
+
+extern void frame_base_append_sniffer (struct gdbarch *gdbarch,
+ frame_base_sniffer_ftype *sniffer);
+
+/* Set the default frame base. If all else fails, this one is
+ returned. If this isn't set, the default is to use legacy code
+ that uses things like the frame ID's base (ulgh!). */
+
+extern void frame_base_set_default (struct gdbarch *gdbarch,
+ const struct frame_base *def);
+
+/* Iterate through the list of frame base handlers until one returns
+ an implementation. */
+
+extern const struct frame_base *frame_base_find_by_frame (struct frame_info *this_frame);
+