gdb/frame-unwind.c

   1 /* Definitions for frame unwinder, for GDB, the GNU debugger.
   2
   3    Copyright 2003 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "frame.h"
  24 #include "frame-unwind.h"
  25 #include "gdb_assert.h"
  26 #include "dummy-frame.h"
  27
  28 static struct gdbarch_data *frame_unwind_data;
  29
  30 struct frame_unwind_table
  31 {
  32   frame_unwind_p_ftype **p;
  33   int middle;
  34   int nr;
  35 };
  36
  37 /* Append a predicate to the end of the table.  */
  38 static void
  39 append_predicate (struct frame_unwind_table *table, frame_unwind_p_ftype *p)
  40 {
  41   table->p = xrealloc (table->p, ((table->nr + 1)
  42                                   * sizeof (frame_unwind_p_ftype *)));
  43   table->p[table->nr] = p;
  44   table->nr++;
  45 }
  46
  47 static void *
  48 frame_unwind_init (struct gdbarch *gdbarch)
  49 {
  50   struct frame_unwind_table *table = XCALLOC (1, struct frame_unwind_table);
  51   append_predicate (table, dummy_frame_p);
  52   return table;
  53 }
  54
  55 static void
  56 frame_unwind_free (struct gdbarch *gdbarch, void *data)
  57 {
  58   struct frame_unwind_table *table =
  59     gdbarch_data (gdbarch, frame_unwind_data);
  60   xfree (table->p);
  61   xfree (table);
  62 }
  63
  64 void
  65 frame_unwind_append_predicate (struct gdbarch *gdbarch,
  66                                frame_unwind_p_ftype *p)
  67 {
  68   struct frame_unwind_table *table =
  69     gdbarch_data (gdbarch, frame_unwind_data);
  70   if (table == NULL)
  71     {
  72       /* ULGH, called during architecture initialization.  Patch
  73          things up.  */
  74       table = frame_unwind_init (gdbarch);
  75       set_gdbarch_data (gdbarch, frame_unwind_data, table);
  76     }
  77   append_predicate (table, p);
  78 }
  79
  80 const struct frame_unwind *
  81 frame_unwind_find_by_pc (struct gdbarch *gdbarch, CORE_ADDR pc)
  82 {
  83   int i;
  84   struct frame_unwind_table *table =
  85     gdbarch_data (gdbarch, frame_unwind_data);
  86   /* Seriously old code.  Don't even try to use this new mechanism.  */
  87   if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES)
  88     return trad_frame_unwind;
  89   for (i = 0; i < table->nr; i++)
  90     {
  91       const struct frame_unwind *desc = table->p[i] (pc);
  92       if (desc != NULL)
  93         return desc;
  94     }
  95   return trad_frame_unwind;
  96 }
  97
  98 void
  99 _initialize_frame_unwind (void)
 100 {
 101   frame_unwind_data = register_gdbarch_data (frame_unwind_init,
 102                                              frame_unwind_free);
 103 }