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ffcc2b69d1
Right now, gdb's self-backtrace feature will still print something
when a backtrace is unavailable:
sig_write (_("----- Backtrace -----\n"));
[...]
sig_write (_("Backtrace unavailable\n"));
sig_write ("---------------------\n");
However, if GDB_PRINT_INTERNAL_BACKTRACE is undefined, it seems better
to me to print nothing at all.
This patch implements this change. It also makes a couple of other
small changes in this same module: it adds a header guard to
bt-utils.h, and it protects the definitions of
gdb_internal_backtrace_1 with a check of GDB_PRINT_INTERNAL_BACKTRACE.
75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
/* Copyright (C) 2021-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Support for printing a backtrace when GDB hits an error. This is not
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for printing backtraces of the inferior, but backtraces of GDB itself. */
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#ifndef BT_UTILS_H
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#define BT_UTILS_H
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#ifdef HAVE_LIBBACKTRACE
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# include "backtrace.h"
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# include "backtrace-supported.h"
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# if BACKTRACE_SUPPORTED && (! BACKTRACE_USES_MALLOC)
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# define GDB_PRINT_INTERNAL_BACKTRACE
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# define GDB_PRINT_INTERNAL_BACKTRACE_USING_LIBBACKTRACE
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# endif
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#endif
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#if defined HAVE_EXECINFO_H \
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&& defined HAVE_EXECINFO_BACKTRACE \
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&& !defined PRINT_BACKTRACE_ON_FATAL_SIGNAL
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# include <execinfo.h>
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# define GDB_PRINT_INTERNAL_BACKTRACE
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# define GDB_PRINT_INTERNAL_BACKTRACE_USING_EXECINFO
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#endif
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/* Define GDB_PRINT_INTERNAL_BACKTRACE_INIT_ON. This is a boolean value
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that can be used as an initial value for a set/show user setting, where
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the setting controls printing a GDB internal backtrace.
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If backtrace printing is supported then this will have the value true,
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but if backtrace printing is not supported then this has the value
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false. */
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#ifdef GDB_PRINT_INTERNAL_BACKTRACE
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# define GDB_PRINT_INTERNAL_BACKTRACE_INIT_ON true
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#else
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# define GDB_PRINT_INTERNAL_BACKTRACE_INIT_ON false
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#endif
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/* Print a backtrace of the current GDB process to the current
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gdb_stderr. The output is done in a signal async manner, so it is safe
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to call from signal handlers. */
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extern void gdb_internal_backtrace ();
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/* A generic function that can be used as the set function for any set
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command that enables printing of an internal backtrace. Command C must
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be a boolean set command.
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If GDB doesn't support printing a backtrace, and the user has tried to
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set the variable associated with command C to true, then the associated
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variable will be set back to false, and an error thrown.
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If GDB does support printing a backtrace then this function does
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nothing. */
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extern void gdb_internal_backtrace_set_cmd (const char *args, int from_tty,
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cmd_list_element *c);
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#endif /* BT_UTILS_H */
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