2004-04-08 Andrew Cagney <cagney@redhat.com>

[thirdparty/binutils-gdb.git] / gdb / frame-unwind.h

diff --git a/gdb/frame-unwind.h b/gdb/frame-unwind.h
index 49f28896ffe602c4103eaaee2e08d60123dcbb43..12d6dd240ed85d3fdfed3ea5c550306069e89987 100644 (file)
--- a/gdb/frame-unwind.h
+++ b/gdb/frame-unwind.h
@@ -131,11 +131,14 @@ struct frame_unwind
   frame_sniffer_ftype *sniffer;
 };
 
-/* Register a frame unwinder, _appending_ it to the end of the search
-   list.  */
-extern void frame_unwind_register_unwinder (struct gdbarch *gdbarch,
-                                           const struct frame_unwind *unwinder);
-
+/* Register a frame unwinder, _prepending_ it to the front of the
+   search list (so it is sniffed before previously registered
+   unwinders).  By using a prepend, later calls can install unwinders
+   that override earlier calls.  This allows, for instance, an OSABI
+   to install a a more specific sigtramp unwinder that overrides the
+   traditional brute-force unwinder.  */
+extern void frame_unwind_prepend_unwinder (struct gdbarch *gdbarch,
+                                          const struct frame_unwind *unwinder);
 
 /* Given the NEXT frame, take a wiff of THIS frame's registers (namely
    the PC and attributes) and if it is the applicable unwinder return