/* Definitions for a frame unwinder, for GDB, the GNU debugger.
- Copyright 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#if !defined (FRAME_UNWIND_H)
#define FRAME_UNWIND_H 1
+struct frame_data;
struct frame_info;
struct frame_id;
struct frame_unwind;
#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. */
-
-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
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.
THIS_PROLOGUE_CACHE can be used to share any prolog analysis data
with the other unwind methods. Memory for that cache should be
- allocated using frame_obstack_zalloc(). */
+ allocated using FRAME_OBSTACK_ZALLOC(). */
typedef void (frame_this_id_ftype) (struct frame_info *next_frame,
void **this_prologue_cache,
THIS_PROLOGUE_CACHE can be used to share any prolog analysis data
with the other unwind methods. Memory for that cache should be
- allocated using frame_obstack_zalloc(). */
+ allocated using FRAME_OBSTACK_ZALLOC(). */
typedef void (frame_prev_register_ftype) (struct frame_info *next_frame,
void **this_prologue_cache,
int *optimized,
enum lval_type * lvalp,
CORE_ADDR *addrp,
- int *realnump, void *valuep);
+ int *realnump, gdb_byte *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
{
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. */
+
+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. Possibly initialize THIS_CACHE. */
+
+extern const struct frame_unwind *frame_unwind_find_by_frame (struct frame_info *next_frame,
+ void **this_cache);
+
#endif