/* Definitions for a frame unwinder, for GDB, the GNU debugger.
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright 2003, 2004 Free Software Foundation, Inc.
This file is part of GDB.
#if !defined (FRAME_UNWIND_H)
#define FRAME_UNWIND_H 1
+struct frame_data;
struct frame_info;
struct frame_id;
struct frame_unwind;
as where this frame's prologue stores the previous frame's
registers. */
+/* Given the NEXT frame, take a wiff of THIS frame's registers (namely
+ the PC and attributes) and if SELF is the applicable unwinder,
+ return non-zero. Possibly also initialize THIS_PROLOGUE_CACHE. */
+
+typedef int (frame_sniffer_ftype) (const struct frame_unwind *self,
+ struct frame_info *next_frame,
+ void **this_prologue_cache);
+
/* Assuming the frame chain: (outer) prev <-> this <-> next (inner);
use the NEXT frame, and its register unwind method, to determine
the frame ID of THIS frame.
CORE_ADDR *addrp,
int *realnump, void *valuep);
+/* Assuming the frame chain: (outer) prev <-> this <-> next (inner);
+ use the NEXT frame, and its register unwind method, to return the PREV
+ frame's program-counter. */
+
+typedef CORE_ADDR (frame_prev_pc_ftype) (struct frame_info *next_frame,
+ void **this_prologue_cache);
+
+
struct frame_unwind
{
/* The frame's type. Should this instead be a collection of
here? */
frame_this_id_ftype *this_id;
frame_prev_register_ftype *prev_register;
+ const struct frame_data *unwind_data;
+ frame_sniffer_ftype *sniffer;
+ frame_prev_pc_ftype *prev_pc;
};
+/* 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
the unwind methods, or NULL if it is not. */
frame_unwind_sniffer_ftype *sniffer);
/* Iterate through the next frame's sniffers until one returns with an
- unwinder implementation. */
+ unwinder implementation. Possibly initialize THIS_CACHE. */
-extern const struct frame_unwind *frame_unwind_find_by_frame (struct frame_info *next_frame);
+extern const struct frame_unwind *frame_unwind_find_by_frame (struct frame_info *next_frame,
+ void **this_cache);
#endif