[gdb/cli] Add ignore-errors command While trying to reproduce a failing test-case from the testsuite on the command line using a gdb command script, I ran into the problem that a command failed which stopped script execution. I could work around this by splitting the script at each error, but I realized it would be nice if I could tell gdb to ignore the error. A python workaround ignore-errors exists, mentioned here ( https://sourceware.org/legacy-ml/gdb/2010-06/msg00100.html ), which is already supplied by distros like Fedora and openSUSE. FTR, a more elaborate try-catch solution was posted here ( https://sourceware.org/bugzilla/show_bug.cgi?id=8487 ). This patch adds native ignore-errors support (so no python needed). So with this script: ... $ cat script.gdb ignore-errors run echo here ... we have: ... $ gdb -q -batch -x script.gdb No executable file specified. Use the "file" or "exec-file" command. here$ ... Note that quit is not caught: ... $ gdb -q (gdb) ignore-errors quit $ ... which is the same behaviour as with the python implementation. Tested on x86_64-linux. gdb/ChangeLog: 2021-05-18 Tom de Vries * cli/cli-cmds.c (ignore_errors_command_completer) (ignore_errors_command): New function. (_initialize_cli_cmds): Add "ignore-errors" cmd. gdb/doc/ChangeLog: 2021-05-18 Tom de Vries * gdb.texinfo (Command Files): Document command ignore-errors. gdb/testsuite/ChangeLog: 2021-05-18 Tom de Vries * gdb.base/ignore-errors.exp: New test. * gdb.base/ignore-errors.gdb: New command file. --- gdb/cli/cli-cmds.c | 35 ++++++++++++++++++++++++++++++++ gdb/doc/gdb.texinfo | 8 +++++++- gdb/testsuite/gdb.base/ignore-errors.exp | 24 ++++++++++++++++++++++ gdb/testsuite/gdb.base/ignore-errors.gdb | 2 ++ 4 files changed, 68 insertions(+), 1 deletion(-) diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c index 31d398cb13b..4eff591b3df 100644 --- a/gdb/cli/cli-cmds.c +++ b/gdb/cli/cli-cmds.c @@ -39,6 +39,7 @@ #include "gdbsupport/filestuff.h" #include "location.h" #include "block.h" +#include "event-top.h" #include "ui-out.h" #include "interps.h" @@ -2399,6 +2400,34 @@ gdb_maint_setting_str_internal_fn (struct gdbarch *gdbarch, return str_value_from_setting (*show_cmd->var, gdbarch); } +/* Completer for "ignore-errors". */ + +static void +ignore_errors_command_completer (cmd_list_element *ignore, + completion_tracker &tracker, + const char *text, const char * /*word*/) +{ + complete_nested_command_line (tracker, text); +} + +/* Implementation of the ignore-errors command. */ + +static void +ignore_errors_command (const char *args, int from_tty) +{ + try + { + execute_command (args, from_tty); + } + catch (const gdb_exception_error &ex) + { + exception_print (gdb_stderr, ex); + + /* See also execute_gdb_command. */ + async_enable_stdin (); + } +} + void _initialize_cli_cmds (); void _initialize_cli_cmds () @@ -2786,4 +2815,10 @@ when GDB is started."), GDBINIT).release (); c = add_cmd ("source", class_support, source_command, source_help_text, &cmdlist); set_cmd_completer (c, filename_completer); + + c = add_cmd ("ignore-errors", class_support, ignore_errors_command, + _("Execute a single command, ignoring all errors.\n" + "Only one-line commands are supported.\n" + "This is primarily useful in scripts."), &cmdlist); + set_cmd_completer (c, ignore_errors_command_completer); } diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 1cf3550885e..68e11585942 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -27680,7 +27680,8 @@ The lines in a command file are generally executed sequentially, unless the order of execution is changed by one of the @emph{flow-control commands} described below. The commands are not printed as they are executed. An error in any command terminates -execution of the command file and control is returned to the console. +execution of the command file and control is returned to the console, +unless the line is prefixed with the @code{ignore-errors} command. @value{GDBN} first searches for @var{filename} in the current directory. If the file is not found there, and @var{filename} does not specify a @@ -27775,6 +27776,11 @@ the controlling expression. @item end Terminate the block of commands that are the body of @code{if}, @code{else}, or @code{while} flow-control commands. + +@kindex ignore-errors +@item ignore-errors +This command executes the command specified by its arguments, but +doesn't stop execution of the script if the command fails. @end table diff --git a/gdb/testsuite/gdb.base/ignore-errors.exp b/gdb/testsuite/gdb.base/ignore-errors.exp new file mode 100644 index 00000000000..30dac7a94e2 --- /dev/null +++ b/gdb/testsuite/gdb.base/ignore-errors.exp @@ -0,0 +1,24 @@ +# Copyright 2021 Free Software Foundation, Inc. + +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . */ + +# Check command ignore-errors. + +clean_restart + +gdb_test "source ignore-errors.gdb" \ + [multi_line \ + "No executable file specified\\." \ + "Use the \"file\" or \"exec-file\" command\\." \ + "here"] diff --git a/gdb/testsuite/gdb.base/ignore-errors.gdb b/gdb/testsuite/gdb.base/ignore-errors.gdb new file mode 100644 index 00000000000..5962ff49b11 --- /dev/null +++ b/gdb/testsuite/gdb.base/ignore-errors.gdb @@ -0,0 +1,2 @@ +ignore-errors run +echo here\n