gdb/sentinel-frame.c - gdb

Global variables defined

Data types defined

Functions defined

Source code

  1. /* Code dealing with register stack frames, for GDB, the GNU debugger.

  3.    Copyright (C) 1986-2015 Free Software Foundation, Inc.

  5.    This file is part of GDB.

  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 3 of the License, or
  10.    (at your option) any later version.

  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.

  17.    You should have received a copy of the GNU General Public License
  18.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */


  21. #include "defs.h"
  22. #include "regcache.h"
  23. #include "sentinel-frame.h"
  24. #include "inferior.h"
  25. #include "frame-unwind.h"

  27. ‌struct frame_unwind_cache
  28. {
  29.   struct regcache *regcache;
  30. };

  32. void *
  33. ‌sentinel_frame_cache (struct regcache *regcache)
  34. {
  35.   struct frame_unwind_cache *cache =
  36.     FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache);

  38.   cache->regcache = regcache;
  39.   return cache;
  40. }

  42. /* Here the register value is taken direct from the register cache.  */

  44. static struct value *
  45. ‌sentinel_frame_prev_register (struct frame_info *this_frame,
  46.                               void **this_prologue_cache,
  47.                               int regnum)
  48. {
  49.   struct frame_unwind_cache *cache = *this_prologue_cache;
  50.   struct value *value;

  52.   value = regcache_cooked_read_value (cache->regcache, regnum);
  53.   VALUE_FRAME_ID (value) = get_frame_id (this_frame);

  55.   return value;
  56. }

  58. static void
  59. ‌sentinel_frame_this_id (struct frame_info *this_frame,
  60.                         void **this_prologue_cache,
  61.                         struct frame_id *this_id)
  62. {
  63.   /* The sentinel frame is used as a starting point for creating the
  64.      previous (inner most) frame.  That frame's THIS_ID method will be
  65.      called to determine the inner most frame's ID.  Not this one.  */
  66.   internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called"));
  67. }

  69. static struct gdbarch *
  70. ‌sentinel_frame_prev_arch (struct frame_info *this_frame,
  71.                           void **this_prologue_cache)
  72. {
  73.   struct frame_unwind_cache *cache = *this_prologue_cache;

  75.   return get_regcache_arch (cache->regcache);
  76. }

  78. ‌const struct frame_unwind sentinel_frame_unwind =
  79. {
  80.   SENTINEL_FRAME,
  81.   default_frame_unwind_stop_reason,
  82.   sentinel_frame_this_id,
  83.   sentinel_frame_prev_register,
  84.   NULL,
  85.   NULL,
  86.   NULL,
  87.   sentinel_frame_prev_arch,
  88. };