gdb/bt-utils.h

   1 /* Copyright (C) 2021-2022 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* Support for printing a backtrace when GDB hits an error.  This is not
  19    for printing backtraces of the inferior, but backtraces of GDB itself.  */
  20
  21 #ifndef BT_UTILS_H
  22 #define BT_UTILS_H
  23
  24 #ifdef HAVE_LIBBACKTRACE
  25 # include "backtrace.h"
  26 # include "backtrace-supported.h"
  27 # if BACKTRACE_SUPPORTED && (! BACKTRACE_USES_MALLOC)
  28 #  define GDB_PRINT_INTERNAL_BACKTRACE
  29 #  define GDB_PRINT_INTERNAL_BACKTRACE_USING_LIBBACKTRACE
  30 # endif
  31 #endif
  32
  33 #if defined HAVE_EXECINFO_H                     \
  34   && defined HAVE_EXECINFO_BACKTRACE            \
  35   && !defined PRINT_BACKTRACE_ON_FATAL_SIGNAL
  36 # include <execinfo.h>
  37 # define GDB_PRINT_INTERNAL_BACKTRACE
  38 # define GDB_PRINT_INTERNAL_BACKTRACE_USING_EXECINFO
  39 #endif
  40
  41 /* Define GDB_PRINT_INTERNAL_BACKTRACE_INIT_ON.  This is a boolean value
  42    that can be used as an initial value for a set/show user setting, where
  43    the setting controls printing a GDB internal backtrace.
  44
  45    If backtrace printing is supported then this will have the value true,
  46    but if backtrace printing is not supported then this has the value
  47    false.  */
  48 #ifdef GDB_PRINT_INTERNAL_BACKTRACE
  49 # define GDB_PRINT_INTERNAL_BACKTRACE_INIT_ON true
  50 #else
  51 # define GDB_PRINT_INTERNAL_BACKTRACE_INIT_ON false
  52 #endif
  53
  54 /* Print a backtrace of the current GDB process to the current
  55    gdb_stderr.  The output is done in a signal async manner, so it is safe
  56    to call from signal handlers.  */
  57
  58 extern void gdb_internal_backtrace ();
  59
  60 /* A generic function that can be used as the set function for any set
  61    command that enables printing of an internal backtrace.  Command C must
  62    be a boolean set command.
  63
  64    If GDB doesn't support printing a backtrace, and the user has tried to
  65    set the variable associated with command C to true, then the associated
  66    variable will be set back to false, and an error thrown.
  67
  68    If GDB does support printing a backtrace then this function does
  69    nothing.  */
  70
  71 extern void gdb_internal_backtrace_set_cmd (const char *args, int from_tty,
  72                                             cmd_list_element *c);
  73
  74 #endif /* BT_UTILS_H */