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_sniffer_ftype **sniffer;
  33   int nr;
  34 };
  35
  36 /* Append a predicate to the end of the table.  */
  37 static void
  38 append_predicate (struct frame_unwind_table *table,
  39                   frame_unwind_sniffer_ftype *sniffer)
  40 {
  41   table->sniffer = xrealloc (table->sniffer, ((table->nr + 1)
  42                                               * sizeof (frame_unwind_sniffer_ftype *)));
  43   table->sniffer[table->nr] = sniffer;
  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_sniffer);
  52   return table;
  53 }
  54
  55 void
  56 frame_unwind_append_sniffer (struct gdbarch *gdbarch,
  57                              frame_unwind_sniffer_ftype *sniffer)
  58 {
  59   struct frame_unwind_table *table =
  60     gdbarch_data (gdbarch, frame_unwind_data);
  61   if (table == NULL)
  62     {
  63       /* ULGH, called during architecture initialization.  Patch
  64          things up.  */
  65       table = frame_unwind_init (gdbarch);
  66       deprecated_set_gdbarch_data (gdbarch, frame_unwind_data, table);
  67     }
  68   append_predicate (table, sniffer);
  69 }
  70
  71 const struct frame_unwind *
  72 frame_unwind_find_by_frame (struct frame_info *next_frame)
  73 {
  74   int i;
  75   struct gdbarch *gdbarch = get_frame_arch (next_frame);
  76   struct frame_unwind_table *table = gdbarch_data (gdbarch, frame_unwind_data);
  77   if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES && legacy_frame_p (gdbarch))
  78     /* Seriously old code.  Don't even try to use this new mechanism.
  79        (Note: The variable USE_GENERIC_DUMMY_FRAMES is deprecated, not
  80        the dummy frame mechanism.  All architectures should be using
  81        generic dummy frames).  */
  82     return legacy_saved_regs_unwind;
  83   for (i = 0; i < table->nr; i++)
  84     {
  85       const struct frame_unwind *desc;
  86       desc = table->sniffer[i] (next_frame);
  87       if (desc != NULL)
  88         return desc;
  89     }
  90   return legacy_saved_regs_unwind;
  91 }
  92
  93 extern initialize_file_ftype _initialize_frame_unwind; /* -Wmissing-prototypes */
  94
  95 void
  96 _initialize_frame_unwind (void)
  97 {
  98   frame_unwind_data = gdbarch_data_register_post_init (frame_unwind_init);
  99 }