gdb/testsuite/

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

diff --git a/gdb/frame-unwind.h b/gdb/frame-unwind.h
index 35eeebf56cc96351ee0ab113648166822497170a..e4cf3201c091d9bda08c38a35b01502e80e18abf 100644 (file)
--- a/gdb/frame-unwind.h
+++ b/gdb/frame-unwind.h
@@ -1,6 +1,7 @@
 /* Definitions for a frame unwinder, for GDB, the GNU debugger.
 
-   Copyright (C) 2003, 2004, 2007, 2008, 2009 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2007, 2008, 2009, 2010
+   Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -121,6 +122,13 @@ typedef struct value * (frame_prev_register_ftype)
 typedef void (frame_dealloc_cache_ftype) (struct frame_info *self,
                                          void *this_cache);
 
+/* Assuming the frame chain: (outer) prev <-> this <-> next (inner);
+   use THIS frame, and implicitly the NEXT frame's register unwind
+   method, return PREV frame's architecture.  */
+
+typedef struct gdbarch *(frame_prev_arch_ftype) (struct frame_info *this_frame,
+                                                void **this_prologue_cache);
+
 struct frame_unwind
 {
   /* The frame's type.  Should this instead be a collection of
@@ -133,6 +141,7 @@ struct frame_unwind
   const struct frame_data *unwind_data;
   frame_sniffer_ftype *sniffer;
   frame_dealloc_cache_ftype *dealloc_cache;
+  frame_prev_arch_ftype *prev_arch;
 };
 
 /* Register a frame unwinder, _prepending_ it to the front of the
@@ -151,11 +160,12 @@ extern void frame_unwind_prepend_unwinder (struct gdbarch *gdbarch,
 extern void frame_unwind_append_unwinder (struct gdbarch *gdbarch,
                                          const struct frame_unwind *unwinder);
 
-/* Iterate through sniffers for THIS frame until one returns with an
-   unwinder implementation.  Possibly initialize THIS_CACHE.  */
+/* Iterate through sniffers for THIS_FRAME frame until one returns with an
+   unwinder implementation.  THIS_FRAME->UNWIND must be NULL, it will get set
+   by this function.  Possibly initialize THIS_CACHE.  */
 
-extern const struct frame_unwind *frame_unwind_find_by_frame (struct frame_info *this_frame,
-                                                             void **this_cache);
+extern void frame_unwind_find_by_frame (struct frame_info *this_frame,
+                                       void **this_cache);
 
 /* Helper functions for value-based register unwinding.  These return
    a (possibly lazy) value of the appropriate type.  */