gdb/frame-info.c

   1 /* Frame info pointer
   2
   3    Copyright (C) 2022 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21
  22 #include "frame-info.h"
  23 #include "frame.h"
  24
  25 /* See frame-info-ptr.h.  */
  26
  27 intrusive_list<frame_info_ptr> frame_info_ptr::frame_list;
  28
  29 /* See frame-info-ptr.h.  */
  30
  31 void
  32 frame_info_ptr::prepare_reinflate ()
  33 {
  34   m_cached_level = frame_relative_level (*this);
  35
  36   if (m_cached_level != 0)
  37     m_cached_id = get_frame_id (*this);
  38 }
  39
  40 /* See frame-info-ptr.h.  */
  41
  42 void
  43 frame_info_ptr::reinflate ()
  44 {
  45   /* Ensure we have a valid frame level (sentinel frame or above), indicating
  46      prepare_reinflate was called.  */
  47   gdb_assert (m_cached_level >= -1);
  48
  49   if (m_ptr != nullptr)
  50     {
  51       /* The frame_info wasn't invalidated, no need to reinflate.  */
  52       return;
  53     }
  54
  55   /* Frame #0 needs special handling, see comment in select_frame.  */
  56   if (m_cached_level == 0)
  57     m_ptr = get_current_frame ().get ();
  58   else
  59     {
  60       gdb_assert (frame_id_p (m_cached_id));
  61       m_ptr = frame_find_by_id (m_cached_id).get ();
  62     }
  63
  64   gdb_assert (m_ptr != nullptr);
  65 }