2003-07-15 Andrew Cagney <cagney@redhat.com>

	* frame.c (get_frame_id): Use frame_unwind_find_by_frame.
	(frame_register_unwind, create_new_frame): Ditto.
	(legacy_get_prev_frame, get_frame_type): Ditto.
	(get_frame_base_address): Use frame_base_find_by_frame.
	(get_frame_locals_address): Use frame_base_find_by_frame.
	(get_frame_args_address): Use frame_base_find_by_frame.
	* frame-base.h (frame_base_sniffer_ftype): Declare.
	(frame_base_append_sniffer): Declare.
	(frame_base_find_by_frame): Replace frame_base_find_by_pc.
	* frame-base.c (append_predicate): Add a "sniffer" parameter.
	(frame_base_append_sniffer): New function.
	(frame_base_append_predicate): Add a NULL sniffer.
	(frame_base_find_by_frame): Replace "frame_base_find_by_pc".
	(struct frame_base_table): Add "sniffer".
	(frame_base_free): Free the "sniffer" table.
	* frame-unwind.h (frame_unwind_sniffer_ftype): Define.
	(frame_unwind_append_sniffer): Declare.
	(frame_unwind_find_by_frame): Replace frame_unwind_find_by_pc.
	* frame-unwind.c (frame_unwind_free): Free the "sniffer" table.
	(struct frame_unwind_table): Add "sniffer", delete "middle".
	(append_predicate): Add "sniffer" parameter, append the sniffer.
	(frame_unwind_init): Update append_predicate call.
	(frame_unwind_append_sniffer): New function.
	(frame_unwind_append_predicate): Update append_predicate call.
	(frame_unwind_find_by_frame): Replace frame_unwind_find_by_pc.

1 files changed, 20 insertions, 15 deletions

diff --git a/gdb/frame-unwind.h b/gdb/frame-unwind.h
index ad1efdf..80ce4b6 100644
--- a/gdb/frame-unwind.h
+++ b/gdb/frame-unwind.h
@@ -30,25 +30,12 @@ struct regcache;
 
 #include "frame.h"		/* For enum frame_type.  */
 
-/* Return the frame unwind methods for the function that contains PC,
-   or NULL if this this unwinder can't handle this frame.  */
-
+/* For compatibility with the old frame code.  See end of header for
+   new methods.  */
 typedef const struct frame_unwind *(frame_unwind_p_ftype) (CORE_ADDR pc);
-
-/* Add a frame unwinder to the list.  The predicates are polled in the
-   order that they are appended.  The initial list contains the dummy
-   frame's predicate.  */
-
 extern void frame_unwind_append_predicate (struct gdbarch *gdbarch,
 					   frame_unwind_p_ftype *p);
 
-/* Iterate through the list of frame unwinders until one returns an
-   implementation.  */
-
-extern const struct frame_unwind *frame_unwind_find_by_pc (struct gdbarch
-							   *gdbarch,
-							   CORE_ADDR pc);
-
 /* The following unwind functions assume a chain of frames forming the
    sequence: (outer) prev <-> this <-> next (inner).  All the
    functions are called with called with the next frame's `struct
@@ -139,4 +126,22 @@ struct frame_unwind
   frame_prev_register_ftype *prev_register;
 };
 
+/* 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
+   the unwind methods, or NULL if it is not.  */
+
+typedef const struct frame_unwind *(frame_unwind_sniffer_ftype) (struct frame_info *next_frame);
+
+/* Add a frame sniffer to the list.  The predicates are polled in the
+   order that they are appended.  The initial list contains the dummy
+   frame sniffer.  */
+
+extern void frame_unwind_append_sniffer (struct gdbarch *gdbarch,
+					 frame_unwind_sniffer_ftype *sniffer);
+
+/* Iterate through the next frame's sniffers until one returns with an
+   unwinder implementation.  */
+
+extern const struct frame_unwind *frame_unwind_find_by_frame (struct frame_info *next_frame);
+
 #endif