2007-08-17 Michael Snyder <msnyder@access-company.com>

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

diff --git a/gdb/frame-unwind.h b/gdb/frame-unwind.h
index 49f28896ffe602c4103eaaee2e08d60123dcbb43..87c8161e6686af7beb686d61814046b12f0f13c6 100644 (file)
--- a/gdb/frame-unwind.h
+++ b/gdb/frame-unwind.h
@@ -1,6 +1,6 @@
 /* Definitions for a frame unwinder, for GDB, the GNU debugger.
 
-   Copyright 2003, 2004 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -16,8 +16,8 @@
 
    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
@@ -72,7 +72,7 @@ typedef int (frame_sniffer_ftype) (const struct frame_unwind *self,
 
    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,
@@ -108,7 +108,7 @@ typedef void (frame_this_id_ftype) (struct frame_info *next_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_prev_register_ftype) (struct frame_info *next_frame,
                                          void **this_prologue_cache,
@@ -116,7 +116,19 @@ typedef void (frame_prev_register_ftype) (struct frame_info *next_frame,
                                          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
 {
@@ -129,13 +141,18 @@ struct frame_unwind
   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, _appending_ it to the end of the search
-   list.  */
-extern void frame_unwind_register_unwinder (struct gdbarch *gdbarch,
-                                           const struct frame_unwind *unwinder);
-
+/* 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