gdb/bt-utils.h

   1 /* Copyright (C) 2021 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 #ifdef HAVE_LIBBACKTRACE
  22 # include "backtrace.h"
  23 # include "backtrace-supported.h"
  24 # if BACKTRACE_SUPPORTED && (! BACKTRACE_USES_MALLOC)
  25 #  define GDB_PRINT_INTERNAL_BACKTRACE
  26 #  define GDB_PRINT_INTERNAL_BACKTRACE_USING_LIBBACKTRACE
  27 # endif
  28 #endif
  29
  30 #if defined HAVE_EXECINFO_H                     \
  31   && defined HAVE_EXECINFO_BACKTRACE            \
  32   && !defined PRINT_BACKTRACE_ON_FATAL_SIGNAL
  33 # include <execinfo.h>
  34 # define GDB_PRINT_INTERNAL_BACKTRACE
  35 # define GDB_PRINT_INTERNAL_BACKTRACE_USING_EXECINFO
  36 #endif
  37
  38 /* Define GDB_PRINT_INTERNAL_BACKTRACE_INIT_ON.  This is a boolean value
  39    that can be used as an initial value for a set/show user setting, where
  40    the setting controls printing a GDB internal backtrace.
  41
  42    If backtrace printing is supported then this will have the value true,
  43    but if backtrace printing is not supported then this has the value
  44    false.  */
  45 #ifdef GDB_PRINT_INTERNAL_BACKTRACE
  46 # define GDB_PRINT_INTERNAL_BACKTRACE_INIT_ON true
  47 #else
  48 # define GDB_PRINT_INTERNAL_BACKTRACE_INIT_ON false
  49 #endif
  50
  51 /* Print a backtrace of the current GDB process to the current
  52    gdb_stderr.  The output is done in a signal async manner, so it is safe
  53    to call from signal handlers.  */
  54
  55 extern void gdb_internal_backtrace ();
  56
  57 /* A generic function that can be used as the set function for any set
  58    command that enables printing of an internal backtrace.  Command C must
  59    be a boolean set command.
  60
  61    If GDB doesn't support printing a backtrace, and the user has tried to
  62    set the variable associated with command C to true, then the associated
  63    variable will be set back to false, and an error thrown.
  64
  65    If GDB does support printing a backtrace then this function does
  66    nothing.  */
  67
  68 extern void gdb_internal_backtrace_set_cmd (const char *args, int from_tty,
  69                                             cmd_list_element *c);