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binutils-gdb/gdb/main.c
Andrew Burgess 8579fd136a gdb/gdbsupport: make xstrprintf and xstrvprintf return a unique_ptr 
The motivation is to reduce the number of places where unmanaged
pointers are returned from allocation type routines.  All of the
callers are updated.

There should be no user visible changes after this commit.
2021-11-16 17:45:45 +00:00

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/* Top level stuff for GDB, the GNU debugger.
Copyright (C) 1986-2021 Free Software Foundation, Inc.
This file is part of GDB.
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 <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "top.h"
#include "target.h"
#include "inferior.h"
#include "symfile.h"
#include "gdbcore.h"
#include "getopt.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include "gdbsupport/event-loop.h"
#include "ui-out.h"
#include "interps.h"
#include "main.h"
#include "source.h"
#include "cli/cli-cmds.h"
#include "objfiles.h"
#include "auto-load.h"
#include "maint.h"
#include "filenames.h"
#include "gdbsupport/filestuff.h"
#include <signal.h>
#include "event-top.h"
#include "infrun.h"
#include "gdbsupport/signals-state-save-restore.h"
#include <algorithm>
#include <vector>
#include "gdbsupport/pathstuff.h"
#include "cli/cli-style.h"
#ifdef GDBTK
#include "gdbtk/generic/gdbtk.h"
#endif
#include "gdbsupport/alt-stack.h"
#include "observable.h"
#include "serial.h"
/* The selected interpreter. This will be used as a set command
variable, so it should always be malloc'ed - since
do_setshow_command will free it. */
char *interpreter_p;
/* Whether dbx commands will be handled. */
int dbx_commands = 0;
/* System root path, used to find libraries etc. */
std::string gdb_sysroot;
/* GDB datadir, used to store data files. */
std::string gdb_datadir;
/* Non-zero if GDB_DATADIR was provided on the command line.
This doesn't track whether data-directory is set later from the
command line, but we don't reread system.gdbinit when that happens. */
static int gdb_datadir_provided = 0;
/* If gdb was configured with --with-python=/path,
the possibly relocated path to python's lib directory. */
std::string python_libdir;
/* Target IO streams. */
struct ui_file *gdb_stdtargin;
struct ui_file *gdb_stdtarg;
struct ui_file *gdb_stdtargerr;
/* True if --batch or --batch-silent was seen. */
int batch_flag = 0;
/* Support for the --batch-silent option. */
int batch_silent = 0;
/* Support for --return-child-result option.
Set the default to -1 to return error in the case
that the program does not run or does not complete. */
int return_child_result = 0;
int return_child_result_value = -1;
/* GDB as it has been invoked from the command line (i.e. argv[0]). */
static char *gdb_program_name;
/* Return read only pointer to GDB_PROGRAM_NAME. */
const char *
get_gdb_program_name (void)
{
return gdb_program_name;
}
static void print_gdb_help (struct ui_file *);
/* Set the data-directory parameter to NEW_DATADIR.
If NEW_DATADIR is not a directory then a warning is printed.
We don't signal an error for backward compatibility. */
void
set_gdb_data_directory (const char *new_datadir)
{
struct stat st;
if (stat (new_datadir, &st) < 0)
{
int save_errno = errno;
fprintf_unfiltered (gdb_stderr, "Warning: ");
print_sys_errmsg (new_datadir, save_errno);
}
else if (!S_ISDIR (st.st_mode))
warning (_("%ps is not a directory."),
styled_string (file_name_style.style (), new_datadir));
gdb_datadir = gdb_realpath (new_datadir).get ();
/* gdb_realpath won't return an absolute path if the path doesn't exist,
but we still want to record an absolute path here. If the user entered
"../foo" and "../foo" doesn't exist then we'll record $(pwd)/../foo which
isn't canonical, but that's ok. */
if (!IS_ABSOLUTE_PATH (gdb_datadir.c_str ()))
{
gdb::unique_xmalloc_ptr<char> abs_datadir
= gdb_abspath (gdb_datadir.c_str ());
gdb_datadir = abs_datadir.get ();
}
}
/* Relocate a file or directory. PROGNAME is the name by which gdb
was invoked (i.e., argv[0]). INITIAL is the default value for the
file or directory. RELOCATABLE is true if the value is relocatable,
false otherwise. This may return an empty string under the same
conditions as make_relative_prefix returning NULL. */
static std::string
relocate_path (const char *progname, const char *initial, bool relocatable)
{
if (relocatable)
{
gdb::unique_xmalloc_ptr<char> str (make_relative_prefix (progname,
BINDIR,
initial));
if (str != nullptr)
return str.get ();
return std::string ();
}
return initial;
}
/* Like relocate_path, but specifically checks for a directory.
INITIAL is relocated according to the rules of relocate_path. If
the result is a directory, it is used; otherwise, INITIAL is used.
The chosen directory is then canonicalized using lrealpath. */
std::string
relocate_gdb_directory (const char *initial, bool relocatable)
{
std::string dir = relocate_path (gdb_program_name, initial, relocatable);
if (!dir.empty ())
{
struct stat s;
if (stat (dir.c_str (), &s) != 0 || !S_ISDIR (s.st_mode))
{
dir.clear ();
}
}
if (dir.empty ())
dir = initial;
/* Canonicalize the directory. */
if (!dir.empty ())
{
gdb::unique_xmalloc_ptr<char> canon_sysroot (lrealpath (dir.c_str ()));
if (canon_sysroot)
dir = canon_sysroot.get ();
}
return dir;
}
/* Given a gdbinit path in FILE, adjusts it according to the gdb_datadir
parameter if it is in the data dir, or passes it through relocate_path
otherwise. */
static std::string
relocate_file_path_maybe_in_datadir (const std::string &file,
bool relocatable)
{
size_t datadir_len = strlen (GDB_DATADIR);
std::string relocated_path;
/* If SYSTEM_GDBINIT lives in data-directory, and data-directory
has been provided, search for SYSTEM_GDBINIT there. */
if (gdb_datadir_provided
&& datadir_len < file.length ()
&& filename_ncmp (file.c_str (), GDB_DATADIR, datadir_len) == 0
&& IS_DIR_SEPARATOR (file[datadir_len]))
{
/* Append the part of SYSTEM_GDBINIT that follows GDB_DATADIR
to gdb_datadir. */
size_t start = datadir_len;
for (; IS_DIR_SEPARATOR (file[start]); ++start)
;
relocated_path = gdb_datadir + SLASH_STRING + file.substr (start);
}
else
{
relocated_path = relocate_path (gdb_program_name, file.c_str (),
relocatable);
}
return relocated_path;
}
/* A class to wrap up the logic for finding the three different types of
initialisation files GDB uses, system wide, home directory, and current
working directory. */
class gdb_initfile_finder
{
public:
/* Constructor. Finds initialisation files named FILENAME in the home
directory or local (current working) directory. System initialisation
files are found in both SYSTEM_FILENAME and SYSTEM_DIRNAME if these
are not nullptr (either or both can be). The matching *_RELOCATABLE
flag is passed through to RELOCATE_FILE_PATH_MAYBE_IN_DATADIR.
If FILENAME starts with a '.' then when looking in the home directory
this first '.' can be ignored in some cases. */
explicit gdb_initfile_finder (const char *filename,
const char *system_filename,
bool system_filename_relocatable,
const char *system_dirname,
bool system_dirname_relocatable,
bool lookup_local_file)
{
struct stat s;
if (system_filename != nullptr && system_filename[0] != '\0')
{
std::string relocated_filename
= relocate_file_path_maybe_in_datadir (system_filename,
system_filename_relocatable);
if (!relocated_filename.empty ()
&& stat (relocated_filename.c_str (), &s) == 0)
m_system_files.push_back (relocated_filename);
}
if (system_dirname != nullptr && system_dirname[0] != '\0')
{
std::string relocated_dirname
= relocate_file_path_maybe_in_datadir (system_dirname,
system_dirname_relocatable);
if (!relocated_dirname.empty ())
{
gdb_dir_up dir (opendir (relocated_dirname.c_str ()));
if (dir != nullptr)
{
std::vector<std::string> files;
while (true)
{
struct dirent *ent = readdir (dir.get ());
if (ent == nullptr)
break;
std::string name (ent->d_name);
if (name == "." || name == "..")
continue;
/* ent->d_type is not available on all systems
(e.g. mingw, Solaris), so we have to call stat(). */
std::string tmp_filename
= relocated_dirname + SLASH_STRING + name;
if (stat (tmp_filename.c_str (), &s) != 0
|| !S_ISREG (s.st_mode))
continue;
const struct extension_language_defn *extlang
= get_ext_lang_of_file (tmp_filename.c_str ());
/* We effectively don't support "set script-extension
off/soft", because we are loading system init files
here, so it does not really make sense to depend on
a setting. */
if (extlang != nullptr && ext_lang_present_p (extlang))
files.push_back (std::move (tmp_filename));
}
std::sort (files.begin (), files.end ());
m_system_files.insert (m_system_files.end (),
files.begin (), files.end ());
}
}
}
/* If the .gdbinit file in the current directory is the same as
the $HOME/.gdbinit file, it should not be sourced. homebuf
and cwdbuf are used in that purpose. Make sure that the stats
are zero in case one of them fails (this guarantees that they
won't match if either exists). */
struct stat homebuf, cwdbuf;
memset (&homebuf, 0, sizeof (struct stat));
memset (&cwdbuf, 0, sizeof (struct stat));
m_home_file = find_gdb_home_config_file (filename, &homebuf);
if (lookup_local_file && stat (filename, &cwdbuf) == 0)
{
if (m_home_file.empty ()
|| memcmp ((char *) &homebuf, (char *) &cwdbuf,
sizeof (struct stat)))
m_local_file = filename;
}
}
DISABLE_COPY_AND_ASSIGN (gdb_initfile_finder);
/* Return a list of system initialisation files. The list could be
empty. */
const std::vector<std::string> &system_files () const
{ return m_system_files; }
/* Return the path to the home initialisation file. The string can be
empty if there is no such file. */
const std::string &home_file () const
{ return m_home_file; }
/* Return the path to the local initialisation file. The string can be
empty if there is no such file. */
const std::string &local_file () const
{ return m_local_file; }
private:
/* Vector of all system init files in the order they should be processed.
Could be empty. */
std::vector<std::string> m_system_files;
/* Initialization file from the home directory. Could be the empty
string if there is no such file found. */
std::string m_home_file;
/* Initialization file from the current working directory. Could be the
empty string if there is no such file found. */
std::string m_local_file;
};
/* Compute the locations of init files that GDB should source and return
them in SYSTEM_GDBINIT, HOME_GDBINIT, LOCAL_GDBINIT. The SYSTEM_GDBINIT
can be returned as an empty vector, and HOME_GDBINIT and LOCAL_GDBINIT
can be returned as empty strings if there is no init file of that
type. */
static void
get_init_files (std::vector<std::string> *system_gdbinit,
std::string *home_gdbinit,
std::string *local_gdbinit)
{
/* Cache the file lookup object so we only actually search for the files
once. */
static gdb::optional<gdb_initfile_finder> init_files;
if (!init_files.has_value ())
init_files.emplace (GDBINIT, SYSTEM_GDBINIT, SYSTEM_GDBINIT_RELOCATABLE,
SYSTEM_GDBINIT_DIR, SYSTEM_GDBINIT_DIR_RELOCATABLE,
true);
*system_gdbinit = init_files->system_files ();
*home_gdbinit = init_files->home_file ();
*local_gdbinit = init_files->local_file ();
}
/* Compute the location of the early init file GDB should source and return
it in HOME_GDBEARLYINIT. HOME_GDBEARLYINIT could be returned as an
empty string if there is no early init file found. */
static void
get_earlyinit_files (std::string *home_gdbearlyinit)
{
/* Cache the file lookup object so we only actually search for the files
once. */
static gdb::optional<gdb_initfile_finder> init_files;
if (!init_files.has_value ())
init_files.emplace (GDBEARLYINIT, nullptr, false, nullptr, false, false);
*home_gdbearlyinit = init_files->home_file ();
}
/* Start up the event loop. This is the entry point to the event loop
from the command loop. */
static void
start_event_loop ()
{
/* Loop until there is nothing to do. This is the entry point to
the event loop engine. gdb_do_one_event will process one event
for each invocation. It blocks waiting for an event and then
processes it. */
while (1)
{
int result = 0;
try
{
result = gdb_do_one_event ();
}
catch (const gdb_exception &ex)
{
exception_print (gdb_stderr, ex);
/* If any exception escaped to here, we better enable
stdin. Otherwise, any command that calls async_disable_stdin,
and then throws, will leave stdin inoperable. */
SWITCH_THRU_ALL_UIS ()
{
async_enable_stdin ();
}
/* If we long-jumped out of do_one_event, we probably didn't
get around to resetting the prompt, which leaves readline
in a messed-up state. Reset it here. */
current_ui->prompt_state = PROMPT_NEEDED;
gdb::observers::command_error.notify ();
/* This call looks bizarre, but it is required. If the user
entered a command that caused an error,
after_char_processing_hook won't be called from
rl_callback_read_char_wrapper. Using a cleanup there
won't work, since we want this function to be called
after a new prompt is printed. */
if (after_char_processing_hook)
(*after_char_processing_hook) ();
/* Maybe better to set a flag to be checked somewhere as to
whether display the prompt or not. */
}
if (result < 0)
break;
}
/* We are done with the event loop. There are no more event sources
to listen to. So we exit GDB. */
return;
}
/* Call command_loop. */
/* Prevent inlining this function for the benefit of GDB's selftests
in the testsuite. Those tests want to run GDB under GDB and stop
here. */
static void captured_command_loop () __attribute__((noinline));
static void
captured_command_loop ()
{
struct ui *ui = current_ui;
/* Top-level execution commands can be run in the background from
here on. */
current_ui->async = 1;
/* Give the interpreter a chance to print a prompt, if necessary */
if (ui->prompt_state != PROMPT_BLOCKED)
interp_pre_command_loop (top_level_interpreter ());
/* Now it's time to start the event loop. */
start_event_loop ();
/* If the command_loop returned, normally (rather than threw an
error) we try to quit. If the quit is aborted, our caller
catches the signal and restarts the command loop. */
quit_command (NULL, ui->instream == ui->stdin_stream);
}
/* Handle command errors thrown from within catch_command_errors. */
static int
handle_command_errors (const struct gdb_exception &e)
{
if (e.reason < 0)
{
exception_print (gdb_stderr, e);
/* If any exception escaped to here, we better enable stdin.
Otherwise, any command that calls async_disable_stdin, and
then throws, will leave stdin inoperable. */
async_enable_stdin ();
return 0;
}
return 1;
}
/* Type of the command callback passed to the const
catch_command_errors. */
typedef void (catch_command_errors_const_ftype) (const char *, int);
/* Wrap calls to commands run before the event loop is started. */
static int
catch_command_errors (catch_command_errors_const_ftype command,
const char *arg, int from_tty,
bool do_bp_actions = false)
{
try
{
int was_sync = current_ui->prompt_state == PROMPT_BLOCKED;
command (arg, from_tty);
maybe_wait_sync_command_done (was_sync);
/* Do any commands attached to breakpoint we stopped at. */
if (do_bp_actions)
bpstat_do_actions ();
}
catch (const gdb_exception &e)
{
return handle_command_errors (e);
}
return 1;
}
/* Adapter for symbol_file_add_main that translates 'from_tty' to a
symfile_add_flags. */
static void
symbol_file_add_main_adapter (const char *arg, int from_tty)
{
symfile_add_flags add_flags = 0;
if (from_tty)
add_flags |= SYMFILE_VERBOSE;
symbol_file_add_main (arg, add_flags);
}
/* Perform validation of the '--readnow' and '--readnever' flags. */
static void
validate_readnow_readnever ()
{
if (readnever_symbol_files && readnow_symbol_files)
{
error (_("%s: '--readnow' and '--readnever' cannot be "
"specified simultaneously"),
gdb_program_name);
}
}
/* Type of this option. */
enum cmdarg_kind
{
/* Option type -x. */
CMDARG_FILE,
/* Option type -ex. */
CMDARG_COMMAND,
/* Option type -ix. */
CMDARG_INIT_FILE,
/* Option type -iex. */
CMDARG_INIT_COMMAND,
/* Option type -eix. */
CMDARG_EARLYINIT_FILE,
/* Option type -eiex. */
CMDARG_EARLYINIT_COMMAND
};
/* Arguments of --command option and its counterpart. */
struct cmdarg
{
cmdarg (cmdarg_kind type_, char *string_)
: type (type_), string (string_)
{}
/* Type of this option. */
enum cmdarg_kind type;
/* Value of this option - filename or the GDB command itself. String memory
is not owned by this structure despite it is 'const'. */
char *string;
};
/* From CMDARG_VEC execute command files (matching FILE_TYPE) or commands
(matching CMD_TYPE). Update the value in *RET if and scripts or
commands are executed. */
static void
execute_cmdargs (const std::vector<struct cmdarg> *cmdarg_vec,
cmdarg_kind file_type, cmdarg_kind cmd_type,
int *ret)
{
for (const auto &cmdarg_p : *cmdarg_vec)
{
if (cmdarg_p.type == file_type)
*ret = catch_command_errors (source_script, cmdarg_p.string,
!batch_flag);
else if (cmdarg_p.type == cmd_type)
*ret = catch_command_errors (execute_command, cmdarg_p.string,
!batch_flag, true);
}
}
static void
captured_main_1 (struct captured_main_args *context)
{
int argc = context->argc;
char **argv = context->argv;
static int quiet = 0;
static int set_args = 0;
static int inhibit_home_gdbinit = 0;
/* Pointers to various arguments from command line. */
char *symarg = NULL;
char *execarg = NULL;
char *pidarg = NULL;
char *corearg = NULL;
char *pid_or_core_arg = NULL;
char *cdarg = NULL;
char *ttyarg = NULL;
/* These are static so that we can take their address in an
initializer. */
static int print_help;
static int print_version;
static int print_configuration;
/* Pointers to all arguments of --command option. */
std::vector<struct cmdarg> cmdarg_vec;
/* All arguments of --directory option. */
std::vector<char *> dirarg;
int i;
int save_auto_load;
int ret = 1;
#ifdef HAVE_USEFUL_SBRK
/* Set this before constructing scoped_command_stats. */
lim_at_start = (char *) sbrk (0);
#endif
scoped_command_stats stat_reporter (false);
#if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
setlocale (LC_MESSAGES, "");
#endif
#if defined (HAVE_SETLOCALE)
setlocale (LC_CTYPE, "");
#endif
#ifdef ENABLE_NLS
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
#endif
notice_open_fds ();
#ifdef __MINGW32__
/* Ensure stderr is unbuffered. A Cygwin pty or pipe is implemented
as a Windows pipe, and Windows buffers on pipes. */
setvbuf (stderr, NULL, _IONBF, BUFSIZ);
#endif
/* Note: `error' cannot be called before this point, because the
caller will crash when trying to print the exception. */
main_ui = new ui (stdin, stdout, stderr);
current_ui = main_ui;
gdb_stdtargerr = gdb_stderr; /* for moment */
gdb_stdtargin = gdb_stdin; /* for moment */
if (bfd_init () != BFD_INIT_MAGIC)
error (_("fatal error: libbfd ABI mismatch"));
#ifdef __MINGW32__
/* On Windows, argv[0] is not necessarily set to absolute form when
GDB is found along PATH, without which relocation doesn't work. */
gdb_program_name = windows_get_absolute_argv0 (argv[0]);
#else
gdb_program_name = xstrdup (argv[0]);
#endif
/* Prefix warning messages with the command name. */
gdb::unique_xmalloc_ptr<char> tmp_warn_preprint
= xstrprintf ("%s: warning: ", gdb_program_name);
warning_pre_print = tmp_warn_preprint.get ();
current_directory = getcwd (NULL, 0);
if (current_directory == NULL)
perror_warning_with_name (_("error finding working directory"));
/* Set the sysroot path. */
gdb_sysroot = relocate_gdb_directory (TARGET_SYSTEM_ROOT,
TARGET_SYSTEM_ROOT_RELOCATABLE);
if (gdb_sysroot.empty ())
gdb_sysroot = TARGET_SYSROOT_PREFIX;
debug_file_directory
= relocate_gdb_directory (DEBUGDIR, DEBUGDIR_RELOCATABLE);
gdb_datadir = relocate_gdb_directory (GDB_DATADIR,
GDB_DATADIR_RELOCATABLE);
#ifdef WITH_PYTHON_LIBDIR
python_libdir = relocate_gdb_directory (WITH_PYTHON_LIBDIR,
PYTHON_LIBDIR_RELOCATABLE);
#endif
#ifdef RELOC_SRCDIR
add_substitute_path_rule (RELOC_SRCDIR,
make_relative_prefix (gdb_program_name, BINDIR,
RELOC_SRCDIR));
#endif
/* There will always be an interpreter. Either the one passed into
this captured main, or one specified by the user at start up, or
the console. Initialize the interpreter to the one requested by
the application. */
interpreter_p = xstrdup (context->interpreter_p);
/* Parse arguments and options. */
{
int c;
/* When var field is 0, use flag field to record the equivalent
short option (or arbitrary numbers starting at 10 for those
with no equivalent). */
enum {
OPT_SE = 10,
OPT_CD,
OPT_ANNOTATE,
OPT_STATISTICS,
OPT_TUI,
OPT_NOWINDOWS,
OPT_WINDOWS,
OPT_IX,
OPT_IEX,
OPT_EIX,
OPT_EIEX,
OPT_READNOW,
OPT_READNEVER
};
/* This struct requires int* in the struct, but write_files is a bool.
So use this temporary int that we write back after argument parsing. */
int write_files_1 = 0;
static struct option long_options[] =
{
{"tui", no_argument, 0, OPT_TUI},
{"dbx", no_argument, &dbx_commands, 1},
{"readnow", no_argument, NULL, OPT_READNOW},
{"readnever", no_argument, NULL, OPT_READNEVER},
{"r", no_argument, NULL, OPT_READNOW},
{"quiet", no_argument, &quiet, 1},
{"q", no_argument, &quiet, 1},
{"silent", no_argument, &quiet, 1},
{"nh", no_argument, &inhibit_home_gdbinit, 1},
{"nx", no_argument, &inhibit_gdbinit, 1},
{"n", no_argument, &inhibit_gdbinit, 1},
{"batch-silent", no_argument, 0, 'B'},
{"batch", no_argument, &batch_flag, 1},
/* This is a synonym for "--annotate=1". --annotate is now
preferred, but keep this here for a long time because people
will be running emacses which use --fullname. */
{"fullname", no_argument, 0, 'f'},
{"f", no_argument, 0, 'f'},
{"annotate", required_argument, 0, OPT_ANNOTATE},
{"help", no_argument, &print_help, 1},
{"se", required_argument, 0, OPT_SE},
{"symbols", required_argument, 0, 's'},
{"s", required_argument, 0, 's'},
{"exec", required_argument, 0, 'e'},
{"e", required_argument, 0, 'e'},
{"core", required_argument, 0, 'c'},
{"c", required_argument, 0, 'c'},
{"pid", required_argument, 0, 'p'},
{"p", required_argument, 0, 'p'},
{"command", required_argument, 0, 'x'},
{"eval-command", required_argument, 0, 'X'},
{"version", no_argument, &print_version, 1},
{"configuration", no_argument, &print_configuration, 1},
{"x", required_argument, 0, 'x'},
{"ex", required_argument, 0, 'X'},
{"init-command", required_argument, 0, OPT_IX},
{"init-eval-command", required_argument, 0, OPT_IEX},
{"ix", required_argument, 0, OPT_IX},
{"iex", required_argument, 0, OPT_IEX},
{"early-init-command", required_argument, 0, OPT_EIX},
{"early-init-eval-command", required_argument, 0, OPT_EIEX},
{"eix", required_argument, 0, OPT_EIX},
{"eiex", required_argument, 0, OPT_EIEX},
#ifdef GDBTK
{"tclcommand", required_argument, 0, 'z'},
{"enable-external-editor", no_argument, 0, 'y'},
{"editor-command", required_argument, 0, 'w'},
#endif
{"ui", required_argument, 0, 'i'},
{"interpreter", required_argument, 0, 'i'},
{"i", required_argument, 0, 'i'},
{"directory", required_argument, 0, 'd'},
{"d", required_argument, 0, 'd'},
{"data-directory", required_argument, 0, 'D'},
{"D", required_argument, 0, 'D'},
{"cd", required_argument, 0, OPT_CD},
{"tty", required_argument, 0, 't'},
{"baud", required_argument, 0, 'b'},
{"b", required_argument, 0, 'b'},
{"nw", no_argument, NULL, OPT_NOWINDOWS},
{"nowindows", no_argument, NULL, OPT_NOWINDOWS},
{"w", no_argument, NULL, OPT_WINDOWS},
{"windows", no_argument, NULL, OPT_WINDOWS},
{"statistics", no_argument, 0, OPT_STATISTICS},
{"write", no_argument, &write_files_1, 1},
{"args", no_argument, &set_args, 1},
{"l", required_argument, 0, 'l'},
{"return-child-result", no_argument, &return_child_result, 1},
{0, no_argument, 0, 0}
};
while (1)
{
int option_index;
c = getopt_long_only (argc, argv, "",
long_options, &option_index);
if (c == EOF || set_args)
break;
/* Long option that takes an argument. */
if (c == 0 && long_options[option_index].flag == 0)
c = long_options[option_index].val;
switch (c)
{
case 0:
/* Long option that just sets a flag. */
break;
case OPT_SE:
symarg = optarg;
execarg = optarg;
break;
case OPT_CD:
cdarg = optarg;
break;
case OPT_ANNOTATE:
/* FIXME: what if the syntax is wrong (e.g. not digits)? */
annotation_level = atoi (optarg);
break;
case OPT_STATISTICS:
/* Enable the display of both time and space usage. */
set_per_command_time (1);
set_per_command_space (1);
break;
case OPT_TUI:
/* --tui is equivalent to -i=tui. */
#ifdef TUI
xfree (interpreter_p);
interpreter_p = xstrdup (INTERP_TUI);
#else
error (_("%s: TUI mode is not supported"), gdb_program_name);
#endif
break;
case OPT_WINDOWS:
/* FIXME: cagney/2003-03-01: Not sure if this option is
actually useful, and if it is, what it should do. */
#ifdef GDBTK
/* --windows is equivalent to -i=insight. */
xfree (interpreter_p);
interpreter_p = xstrdup (INTERP_INSIGHT);
#endif
break;
case OPT_NOWINDOWS:
/* -nw is equivalent to -i=console. */
xfree (interpreter_p);
interpreter_p = xstrdup (INTERP_CONSOLE);
break;
case 'f':
annotation_level = 1;
break;
case 's':
symarg = optarg;
break;
case 'e':
execarg = optarg;
break;
case 'c':
corearg = optarg;
break;
case 'p':
pidarg = optarg;
break;
case 'x':
cmdarg_vec.emplace_back (CMDARG_FILE, optarg);
break;
case 'X':
cmdarg_vec.emplace_back (CMDARG_COMMAND, optarg);
break;
case OPT_IX:
cmdarg_vec.emplace_back (CMDARG_INIT_FILE, optarg);
break;
case OPT_IEX:
cmdarg_vec.emplace_back (CMDARG_INIT_COMMAND, optarg);
break;
case OPT_EIX:
cmdarg_vec.emplace_back (CMDARG_EARLYINIT_FILE, optarg);
break;
case OPT_EIEX:
cmdarg_vec.emplace_back (CMDARG_EARLYINIT_COMMAND, optarg);
break;
case 'B':
batch_flag = batch_silent = 1;
gdb_stdout = new null_file ();
break;
case 'D':
if (optarg[0] == '\0')
error (_("%s: empty path for `--data-directory'"),
gdb_program_name);
set_gdb_data_directory (optarg);
gdb_datadir_provided = 1;
break;
#ifdef GDBTK
case 'z':
{
if (!gdbtk_test (optarg))
error (_("%s: unable to load tclcommand file \"%s\""),
gdb_program_name, optarg);
break;
}
case 'y':
/* Backwards compatibility only. */
break;
case 'w':
{
/* Set the external editor commands when gdb is farming out files
to be edited by another program. */
external_editor_command = xstrdup (optarg);
break;
}
#endif /* GDBTK */
case 'i':
xfree (interpreter_p);
interpreter_p = xstrdup (optarg);
break;
case 'd':
dirarg.push_back (optarg);
break;
case 't':
ttyarg = optarg;
break;
case 'q':
quiet = 1;
break;
case 'b':
{
int rate;
char *p;
rate = strtol (optarg, &p, 0);
if (rate == 0 && p == optarg)
warning (_("could not set baud rate to `%s'."),
optarg);
else
baud_rate = rate;
}
break;
case 'l':
{
int timeout;
char *p;
timeout = strtol (optarg, &p, 0);
if (timeout == 0 && p == optarg)
warning (_("could not set timeout limit to `%s'."),
optarg);
else
remote_timeout = timeout;
}
break;
case OPT_READNOW:
{
readnow_symbol_files = 1;
validate_readnow_readnever ();
}
break;
case OPT_READNEVER:
{
readnever_symbol_files = 1;
validate_readnow_readnever ();
}
break;
case '?':
error (_("Use `%s --help' for a complete list of options."),
gdb_program_name);
}
}
write_files = (write_files_1 != 0);
if (batch_flag)
{
quiet = 1;
/* Disable all output styling when running in batch mode. */
cli_styling = 0;
}
}
save_original_signals_state (quiet);
/* Try to set up an alternate signal stack for SIGSEGV handlers. */
gdb::alternate_signal_stack signal_stack;
/* Initialize all files. */
gdb_init ();
/* Process early init files and early init options from the command line. */
if (!inhibit_gdbinit)
{
std::string home_gdbearlyinit;
get_earlyinit_files (&home_gdbearlyinit);
if (!home_gdbearlyinit.empty () && !inhibit_home_gdbinit)
ret = catch_command_errors (source_script,
home_gdbearlyinit.c_str (), 0);
}
execute_cmdargs (&cmdarg_vec, CMDARG_EARLYINIT_FILE,
CMDARG_EARLYINIT_COMMAND, &ret);
/* Initialize the extension languages. */
ext_lang_initialization ();
/* Recheck if we're starting up quietly after processing the startup
scripts and commands. */
if (!quiet)
quiet = check_quiet_mode ();
/* Now that gdb_init has created the initial inferior, we're in
position to set args for that inferior. */
if (set_args)
{
/* The remaining options are the command-line options for the
inferior. The first one is the sym/exec file, and the rest
are arguments. */
if (optind >= argc)
error (_("%s: `--args' specified but no program specified"),
gdb_program_name);
symarg = argv[optind];
execarg = argv[optind];
++optind;
set_inferior_args_vector (argc - optind, &argv[optind]);
}
else
{
/* OK, that's all the options. */
/* The first argument, if specified, is the name of the
executable. */
if (optind < argc)
{
symarg = argv[optind];
execarg = argv[optind];
optind++;
}
/* If the user hasn't already specified a PID or the name of a
core file, then a second optional argument is allowed. If
present, this argument should be interpreted as either a
PID or a core file, whichever works. */
if (pidarg == NULL && corearg == NULL && optind < argc)
{
pid_or_core_arg = argv[optind];
optind++;
}
/* Any argument left on the command line is unexpected and
will be ignored. Inform the user. */
if (optind < argc)
fprintf_unfiltered (gdb_stderr,
_("Excess command line "
"arguments ignored. (%s%s)\n"),
argv[optind],
(optind == argc - 1) ? "" : " ...");
}
/* Lookup gdbinit files. Note that the gdbinit file name may be
overridden during file initialization, so get_init_files should be
called after gdb_init. */
std::vector<std::string> system_gdbinit;
std::string home_gdbinit;
std::string local_gdbinit;
get_init_files (&system_gdbinit, &home_gdbinit, &local_gdbinit);
/* Do these (and anything which might call wrap_here or *_filtered)
after initialize_all_files() but before the interpreter has been
installed. Otherwize the help/version messages will be eaten by
the interpreter's output handler. */
if (print_version)
{
print_gdb_version (gdb_stdout, false);
wrap_here ("");
printf_filtered ("\n");
exit (0);
}
if (print_help)
{
print_gdb_help (gdb_stdout);
exit (0);
}
if (print_configuration)
{
print_gdb_configuration (gdb_stdout);
wrap_here ("");
printf_filtered ("\n");
exit (0);
}
/* FIXME: cagney/2003-02-03: The big hack (part 1 of 2) that lets
GDB retain the old MI1 interpreter startup behavior. Output the
copyright message before the interpreter is installed. That way
it isn't encapsulated in MI output. */
if (!quiet && strcmp (interpreter_p, INTERP_MI1) == 0)
{
/* Print all the junk at the top, with trailing "..." if we are
about to read a symbol file (possibly slowly). */
print_gdb_version (gdb_stdout, true);
if (symarg)
printf_filtered ("..");
wrap_here ("");
printf_filtered ("\n");
gdb_flush (gdb_stdout); /* Force to screen during slow
operations. */
}
/* Install the default UI. All the interpreters should have had a
look at things by now. Initialize the default interpreter. */
set_top_level_interpreter (interpreter_p);
/* FIXME: cagney/2003-02-03: The big hack (part 2 of 2) that lets
GDB retain the old MI1 interpreter startup behavior. Output the
copyright message after the interpreter is installed when it is
any sane interpreter. */
if (!quiet && !current_interp_named_p (INTERP_MI1))
{
/* Print all the junk at the top, with trailing "..." if we are
about to read a symbol file (possibly slowly). */
print_gdb_version (gdb_stdout, true);
if (symarg)
printf_filtered ("..");
wrap_here ("");
printf_filtered ("\n");
gdb_flush (gdb_stdout); /* Force to screen during slow
operations. */
}
/* Set off error and warning messages with a blank line. */
tmp_warn_preprint.reset ();
warning_pre_print = _("\nwarning: ");
/* Read and execute the system-wide gdbinit file, if it exists.
This is done *before* all the command line arguments are
processed; it sets global parameters, which are independent of
what file you are debugging or what directory you are in. */
if (!system_gdbinit.empty () && !inhibit_gdbinit)
{
for (const std::string &file : system_gdbinit)
ret = catch_command_errors (source_script, file.c_str (), 0);
}
/* Read and execute $HOME/.gdbinit file, if it exists. This is done
*before* all the command line arguments are processed; it sets
global parameters, which are independent of what file you are
debugging or what directory you are in. */
if (!home_gdbinit.empty () && !inhibit_gdbinit && !inhibit_home_gdbinit)
ret = catch_command_errors (source_script, home_gdbinit.c_str (), 0);
/* Process '-ix' and '-iex' options early. */
execute_cmdargs (&cmdarg_vec, CMDARG_INIT_FILE, CMDARG_INIT_COMMAND, &ret);
/* Now perform all the actions indicated by the arguments. */
if (cdarg != NULL)
{
ret = catch_command_errors (cd_command, cdarg, 0);
}
for (i = 0; i < dirarg.size (); i++)
ret = catch_command_errors (directory_switch, dirarg[i], 0);
/* Skip auto-loading section-specified scripts until we've sourced
local_gdbinit (which is often used to augment the source search
path). */
save_auto_load = global_auto_load;
global_auto_load = 0;
if (execarg != NULL
&& symarg != NULL
&& strcmp (execarg, symarg) == 0)
{
/* The exec file and the symbol-file are the same. If we can't
open it, better only print one error message.
catch_command_errors returns non-zero on success! */
ret = catch_command_errors (exec_file_attach, execarg,
!batch_flag);
if (ret != 0)
ret = catch_command_errors (symbol_file_add_main_adapter,
symarg, !batch_flag);
}
else
{
if (execarg != NULL)
ret = catch_command_errors (exec_file_attach, execarg,
!batch_flag);
if (symarg != NULL)
ret = catch_command_errors (symbol_file_add_main_adapter,
symarg, !batch_flag);
}
if (corearg && pidarg)
error (_("Can't attach to process and specify "
"a core file at the same time."));
if (corearg != NULL)
{
ret = catch_command_errors (core_file_command, corearg,
!batch_flag);
}
else if (pidarg != NULL)
{
ret = catch_command_errors (attach_command, pidarg, !batch_flag);
}
else if (pid_or_core_arg)
{
/* The user specified 'gdb program pid' or gdb program core'.
If pid_or_core_arg's first character is a digit, try attach
first and then corefile. Otherwise try just corefile. */
if (isdigit (pid_or_core_arg[0]))
{
ret = catch_command_errors (attach_command, pid_or_core_arg,
!batch_flag);
if (ret == 0)
ret = catch_command_errors (core_file_command,
pid_or_core_arg,
!batch_flag);
}
else
{
/* Can't be a pid, better be a corefile. */
ret = catch_command_errors (core_file_command,
pid_or_core_arg,
!batch_flag);
}
}
if (ttyarg != NULL)
current_inferior ()->set_tty (ttyarg);
/* Error messages should no longer be distinguished with extra output. */
warning_pre_print = _("warning: ");
/* Read the .gdbinit file in the current directory, *if* it isn't
the same as the $HOME/.gdbinit file (it should exist, also). */
if (!local_gdbinit.empty ())
{
auto_load_local_gdbinit_pathname
= gdb_realpath (local_gdbinit.c_str ()).release ();
if (!inhibit_gdbinit && auto_load_local_gdbinit)
{
auto_load_debug_printf ("Loading .gdbinit file \"%s\".",
local_gdbinit.c_str ());
if (file_is_auto_load_safe (local_gdbinit.c_str ()))
{
auto_load_local_gdbinit_loaded = 1;
ret = catch_command_errors (source_script, local_gdbinit.c_str (), 0);
}
}
}
/* Now that all .gdbinit's have been read and all -d options have been
processed, we can read any scripts mentioned in SYMARG.
We wait until now because it is common to add to the source search
path in local_gdbinit. */
global_auto_load = save_auto_load;
for (objfile *objfile : current_program_space->objfiles ())
load_auto_scripts_for_objfile (objfile);
/* Process '-x' and '-ex' options. */
execute_cmdargs (&cmdarg_vec, CMDARG_FILE, CMDARG_COMMAND, &ret);
/* Read in the old history after all the command files have been
read. */
init_history ();
if (batch_flag)
{
int error_status = EXIT_FAILURE;
int *exit_arg = ret == 0 ? &error_status : NULL;
/* We have hit the end of the batch file. */
quit_force (exit_arg, 0);
}
}
static void
captured_main (void *data)
{
struct captured_main_args *context = (struct captured_main_args *) data;
captured_main_1 (context);
/* NOTE: cagney/1999-11-07: There is probably no reason for not
moving this loop and the code found in captured_command_loop()
into the command_loop() proper. The main thing holding back that
change - SET_TOP_LEVEL() - has been eliminated. */
while (1)
{
try
{
captured_command_loop ();
}
catch (const gdb_exception &ex)
{
exception_print (gdb_stderr, ex);
}
}
/* No exit -- exit is through quit_command. */
}
int
gdb_main (struct captured_main_args *args)
{
try
{
captured_main (args);
}
catch (const gdb_exception &ex)
{
exception_print (gdb_stderr, ex);
}
/* The only way to end up here is by an error (normal exit is
handled by quit_force()), hence always return an error status. */
return 1;
}
/* Don't use *_filtered for printing help. We don't want to prompt
for continue no matter how small the screen or how much we're going
to print. */
static void
print_gdb_help (struct ui_file *stream)
{
std::vector<std::string> system_gdbinit;
std::string home_gdbinit;
std::string local_gdbinit;
std::string home_gdbearlyinit;
get_init_files (&system_gdbinit, &home_gdbinit, &local_gdbinit);
get_earlyinit_files (&home_gdbearlyinit);
/* Note: The options in the list below are only approximately sorted
in the alphabetical order, so as to group closely related options
together. */
fputs_unfiltered (_("\
This is the GNU debugger. Usage:\n\n\
gdb [options] [executable-file [core-file or process-id]]\n\
gdb [options] --args executable-file [inferior-arguments ...]\n\n\
"), stream);
fputs_unfiltered (_("\
Selection of debuggee and its files:\n\n\
--args Arguments after executable-file are passed to inferior.\n\
--core=COREFILE Analyze the core dump COREFILE.\n\
--exec=EXECFILE Use EXECFILE as the executable.\n\
--pid=PID Attach to running process PID.\n\
--directory=DIR Search for source files in DIR.\n\
--se=FILE Use FILE as symbol file and executable file.\n\
--symbols=SYMFILE Read symbols from SYMFILE.\n\
--readnow Fully read symbol files on first access.\n\
--readnever Do not read symbol files.\n\
--write Set writing into executable and core files.\n\n\
"), stream);
fputs_unfiltered (_("\
Initial commands and command files:\n\n\
--command=FILE, -x Execute GDB commands from FILE.\n\
--init-command=FILE, -ix\n\
Like -x but execute commands before loading inferior.\n\
--eval-command=COMMAND, -ex\n\
Execute a single GDB command.\n\
May be used multiple times and in conjunction\n\
with --command.\n\
--init-eval-command=COMMAND, -iex\n\
Like -ex but before loading inferior.\n\
--nh Do not read ~/.gdbinit.\n\
--nx Do not read any .gdbinit files in any directory.\n\n\
"), stream);
fputs_unfiltered (_("\
Output and user interface control:\n\n\
--fullname Output information used by emacs-GDB interface.\n\
--interpreter=INTERP\n\
Select a specific interpreter / user interface.\n\
--tty=TTY Use TTY for input/output by the program being debugged.\n\
-w Use the GUI interface.\n\
--nw Do not use the GUI interface.\n\
"), stream);
#if defined(TUI)
fputs_unfiltered (_("\
--tui Use a terminal user interface.\n\
"), stream);
#endif
fputs_unfiltered (_("\
--dbx DBX compatibility mode.\n\
-q, --quiet, --silent\n\
Do not print version number on startup.\n\n\
"), stream);
fputs_unfiltered (_("\
Operating modes:\n\n\
--batch Exit after processing options.\n\
--batch-silent Like --batch, but suppress all gdb stdout output.\n\
--return-child-result\n\
GDB exit code will be the child's exit code.\n\
--configuration Print details about GDB configuration and then exit.\n\
--help Print this message and then exit.\n\
--version Print version information and then exit.\n\n\
Remote debugging options:\n\n\
-b BAUDRATE Set serial port baud rate used for remote debugging.\n\
-l TIMEOUT Set timeout in seconds for remote debugging.\n\n\
Other options:\n\n\
--cd=DIR Change current directory to DIR.\n\
--data-directory=DIR, -D\n\
Set GDB's data-directory to DIR.\n\
"), stream);
fputs_unfiltered (_("\n\
At startup, GDB reads the following early init files and executes their\n\
commands:\n\
"), stream);
if (!home_gdbearlyinit.empty ())
fprintf_unfiltered (stream, _("\
* user-specific early init file: %s\n\
"), home_gdbearlyinit.c_str ());
if (home_gdbearlyinit.empty ())
fprintf_unfiltered (stream, _("\
None found.\n"));
fputs_unfiltered (_("\n\
At startup, GDB reads the following init files and executes their commands:\n\
"), stream);
if (!system_gdbinit.empty ())
{
std::string output;
for (size_t idx = 0; idx < system_gdbinit.size (); ++idx)
{
output += system_gdbinit[idx];
if (idx < system_gdbinit.size () - 1)
output += ", ";
}
fprintf_unfiltered (stream, _("\
* system-wide init files: %s\n\
"), output.c_str ());
}
if (!home_gdbinit.empty ())
fprintf_unfiltered (stream, _("\
* user-specific init file: %s\n\
"), home_gdbinit.c_str ());
if (!local_gdbinit.empty ())
fprintf_unfiltered (stream, _("\
* local init file (see also 'set auto-load local-gdbinit'): ./%s\n\
"), local_gdbinit.c_str ());
if (system_gdbinit.empty () && home_gdbinit.empty ()
&& local_gdbinit.empty ())
fprintf_unfiltered (stream, _("\
None found.\n"));
fputs_unfiltered (_("\n\
For more information, type \"help\" from within GDB, or consult the\n\
GDB manual (available as on-line info or a printed manual).\n\
"), stream);
if (REPORT_BUGS_TO[0] && stream == gdb_stdout)
fprintf_unfiltered (stream, _("\n\
Report bugs to %s.\n\
"), REPORT_BUGS_TO);
if (stream == gdb_stdout)
fprintf_unfiltered (stream, _("\n\
You can ask GDB-related questions on the GDB users mailing list\n\
(gdb@sourceware.org) or on GDB's IRC channel (#gdb on Freenode).\n"));
}
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