/* 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.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#if !defined (FRAME_UNWIND_H)
#define FRAME_UNWIND_H 1
+struct frame_data;
struct frame_info;
struct frame_id;
struct frame_unwind;
struct gdbarch;
struct regcache;
-/* 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);
+#include "frame.h" /* For enum frame_type. */
/* The following unwind functions assume a chain of frames forming the
sequence: (outer) prev <-> this <-> next (inner). All the
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);
+
+/* Deallocate extra memory associated with the frame cache if any. */
+
+typedef void (frame_dealloc_cache_ftype) (struct frame_info *self,
+ void *this_cache);
struct frame_unwind
{
- /* Should the frame's type go here? */
+ /* The frame's type. Should this instead be a collection of
+ predicates that test the frame for various attributes? */
+ enum frame_type type;
/* Should an attribute indicating the frame's address-in-block go
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;
+ frame_dealloc_cache_ftype *dealloc_cache;
};
+/* 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
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