mirror of
https://sourceware.org/git/binutils-gdb.git
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e0700ba44c
String-like settings (var_string, var_filename, var_optional_filename, var_string_noescape) currently take a pointer to a `char *` storage variable (typically global) that holds the setting's value. I'd like to "mordernize" this by changing them to use an std::string for storage. An obvious reason is that string operations on std::string are often easier to write than with C strings. And they avoid having to do any manual memory management. Another interesting reason is that, with `char *`, nullptr and an empty string often both have the same meaning of "no value". String settings are initially nullptr (unless initialized otherwise). But when doing "set foo" (where `foo` is a string setting), the setting now points to an empty string. For example, solib_search_path is nullptr at startup, but points to an empty string after doing "set solib-search-path". This leads to some code that needs to check for both to check for "no value". Or some code that converts back and forth between NULL and "" when getting or setting the value. I find this very error-prone, because it is very easy to forget one or the other. With std::string, we at least know that the variable is not "NULL". There is only one way of representing an empty string setting, that is with an empty string. I was wondering whether the distinction between NULL and "" would be important for some setting, but it doesn't seem so. If that ever happens, it would be more C++-y and self-descriptive to use optional<string> anyway. Actually, there's one spot where this distinction mattered, it's in init_history, for the test gdb.base/gdbinit-history.exp. init_history sets the history filename to the default ".gdb_history" if it sees that the setting was never set - if history_filename is nullptr. If history_filename is an empty string, it means the setting was explicitly cleared, so it leaves it as-is. With the change to std::string, this distinction doesn't exist anymore. This can be fixed by moving the code that chooses a good default value for history_filename to _initialize_top. This is ran before -ex commands are processed, so an -ex command can then clear that value if needed (what gdb.base/gdbinit-history.exp tests). Another small improvement, in my opinion is that we can now easily give string parameters initial values, by simply initializing the global variables, instead of xstrdup-ing it in the _initialize function. In Python and Guile, when registering a string-like parameter, we allocate (with new) an std::string that is owned by the param_smob (in Guile) and the parmpy_object (in Python) objects. This patch started by changing all relevant add_setshow_* commands to take an `std::string *` instead of a `char **` and fixing everything that failed to build. That includes of course all string setting variable and their uses. string_option_def now uses an std::string also, because there's a connection between options and settings (see add_setshow_cmds_for_options). The add_path function in source.c is really complex and twisted, I'd rather not try to change it to work on an std::string right now. Instead, I added an overload that copies the std:string to a `char *` and back. This means more copying, but this is not used in a hot path at all, so I think it is acceptable. Change-Id: I92c50a1bdd8307141cdbacb388248e4e4fc08c93 Co-authored-by: Lancelot SIX <lsix@lancelotsix.com>
729 lines
16 KiB
C
729 lines
16 KiB
C
/* Generic serial interface routines
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Copyright (C) 1992-2021 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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#include "defs.h"
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#include <ctype.h>
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#include "serial.h"
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#include "gdbcmd.h"
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#include "cli/cli-utils.h"
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/* Is serial being debugged? */
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static unsigned int global_serial_debug_p;
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/* Serial I/O handlers. */
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static std::vector<const struct serial_ops *> serial_ops_list;
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/* Pointer to list of scb's. */
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static struct serial *scb_base;
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/* Non-NULL gives filename which contains a recording of the remote session,
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suitable for playback by gdbserver. */
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static std::string serial_logfile;
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static struct ui_file *serial_logfp = NULL;
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static const struct serial_ops *serial_interface_lookup (const char *);
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static void serial_logchar (struct ui_file *stream,
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int ch_type, int ch, int timeout);
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static const char logbase_hex[] = "hex";
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static const char logbase_octal[] = "octal";
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static const char logbase_ascii[] = "ascii";
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static const char *const logbase_enums[] =
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{logbase_hex, logbase_octal, logbase_ascii, NULL};
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static const char *serial_logbase = logbase_ascii;
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static int serial_current_type = 0;
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/* Log char CH of type CHTYPE, with TIMEOUT. */
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/* Define bogus char to represent a BREAK. Should be careful to choose a value
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that can't be confused with a normal char, or an error code. */
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#define SERIAL_BREAK 1235
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static void
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serial_logchar (struct ui_file *stream, int ch_type, int ch, int timeout)
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{
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if (ch_type != serial_current_type)
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{
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fprintf_unfiltered (stream, "\n%c ", ch_type);
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serial_current_type = ch_type;
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}
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if (serial_logbase != logbase_ascii)
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fputc_unfiltered (' ', stream);
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switch (ch)
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{
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case SERIAL_TIMEOUT:
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fprintf_unfiltered (stream, "<Timeout: %d seconds>", timeout);
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return;
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case SERIAL_ERROR:
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fprintf_unfiltered (stream, "<Error: %s>", safe_strerror (errno));
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return;
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case SERIAL_EOF:
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fputs_unfiltered ("<Eof>", stream);
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return;
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case SERIAL_BREAK:
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fputs_unfiltered ("<Break>", stream);
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return;
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default:
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if (serial_logbase == logbase_hex)
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fprintf_unfiltered (stream, "%02x", ch & 0xff);
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else if (serial_logbase == logbase_octal)
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fprintf_unfiltered (stream, "%03o", ch & 0xff);
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else
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switch (ch)
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{
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case '\\':
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fputs_unfiltered ("\\\\", stream);
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break;
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case '\b':
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fputs_unfiltered ("\\b", stream);
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break;
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case '\f':
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fputs_unfiltered ("\\f", stream);
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break;
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case '\n':
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fputs_unfiltered ("\\n", stream);
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break;
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case '\r':
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fputs_unfiltered ("\\r", stream);
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break;
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case '\t':
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fputs_unfiltered ("\\t", stream);
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break;
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case '\v':
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fputs_unfiltered ("\\v", stream);
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break;
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default:
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fprintf_unfiltered (stream,
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isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF);
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break;
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}
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}
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}
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void
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serial_log_command (struct target_ops *self, const char *cmd)
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{
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if (!serial_logfp)
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return;
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serial_current_type = 'c';
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fputs_unfiltered ("\nc ", serial_logfp);
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fputs_unfiltered (cmd, serial_logfp);
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/* Make sure that the log file is as up-to-date as possible,
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in case we are getting ready to dump core or something. */
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gdb_flush (serial_logfp);
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}
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static const struct serial_ops *
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serial_interface_lookup (const char *name)
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{
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for (const serial_ops *ops : serial_ops_list)
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if (strcmp (name, ops->name) == 0)
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return ops;
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return NULL;
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}
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void
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serial_add_interface (const struct serial_ops *optable)
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{
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serial_ops_list.push_back (optable);
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}
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/* Return the open serial device for FD, if found, or NULL if FD is
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not already opened. */
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struct serial *
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serial_for_fd (int fd)
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{
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struct serial *scb;
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for (scb = scb_base; scb; scb = scb->next)
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if (scb->fd == fd)
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return scb;
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return NULL;
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}
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/* Create a new serial for OPS. */
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static struct serial *
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new_serial (const struct serial_ops *ops)
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{
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struct serial *scb;
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scb = XCNEW (struct serial);
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scb->ops = ops;
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scb->bufp = scb->buf;
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scb->error_fd = -1;
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scb->refcnt = 1;
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return scb;
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}
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static struct serial *serial_open_ops_1 (const struct serial_ops *ops,
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const char *open_name);
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/* Open up a device or a network socket, depending upon the syntax of NAME. */
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struct serial *
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serial_open (const char *name)
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{
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const struct serial_ops *ops;
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const char *open_name = name;
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if (startswith (name, "|"))
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{
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ops = serial_interface_lookup ("pipe");
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/* Discard ``|'' and any space before the command itself. */
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++open_name;
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open_name = skip_spaces (open_name);
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}
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/* Check for a colon, suggesting an IP address/port pair.
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Do this *after* checking for all the interesting prefixes. We
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don't want to constrain the syntax of what can follow them. */
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else if (strchr (name, ':'))
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ops = serial_interface_lookup ("tcp");
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else
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{
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#ifndef USE_WIN32API
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/* Check to see if name is a socket. If it is, then treat it
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as such. Otherwise assume that it's a character device. */
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struct stat sb;
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if (stat (name, &sb) == 0 && (sb.st_mode & S_IFMT) == S_IFSOCK)
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ops = serial_interface_lookup ("local");
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else
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#endif
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ops = serial_interface_lookup ("hardwire");
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}
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if (!ops)
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return NULL;
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return serial_open_ops_1 (ops, open_name);
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}
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/* Open up a serial for OPS, passing OPEN_NAME to the open method. */
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static struct serial *
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serial_open_ops_1 (const struct serial_ops *ops, const char *open_name)
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{
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struct serial *scb;
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scb = new_serial (ops);
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/* `...->open (...)' would get expanded by the open(2) syscall macro. */
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if ((*scb->ops->open) (scb, open_name))
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{
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xfree (scb);
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return NULL;
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}
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scb->name = open_name != NULL ? xstrdup (open_name) : NULL;
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scb->next = scb_base;
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scb_base = scb;
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if (!serial_logfile.empty ())
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{
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stdio_file_up file (new stdio_file ());
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if (!file->open (serial_logfile.c_str (), "w"))
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perror_with_name (serial_logfile.c_str ());
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serial_logfp = file.release ();
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}
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return scb;
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}
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/* See serial.h. */
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struct serial *
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serial_open_ops (const struct serial_ops *ops)
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{
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return serial_open_ops_1 (ops, NULL);
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}
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/* Open a new serial stream using a file handle, using serial
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interface ops OPS. */
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static struct serial *
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serial_fdopen_ops (const int fd, const struct serial_ops *ops)
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{
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struct serial *scb;
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if (!ops)
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{
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ops = serial_interface_lookup ("terminal");
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if (!ops)
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ops = serial_interface_lookup ("hardwire");
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}
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if (!ops)
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return NULL;
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scb = new_serial (ops);
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scb->name = NULL;
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scb->next = scb_base;
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scb_base = scb;
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if ((ops->fdopen) != NULL)
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(*ops->fdopen) (scb, fd);
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else
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scb->fd = fd;
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return scb;
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}
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struct serial *
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serial_fdopen (const int fd)
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{
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return serial_fdopen_ops (fd, NULL);
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}
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static void
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do_serial_close (struct serial *scb, int really_close)
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{
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struct serial *tmp_scb;
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if (serial_logfp)
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{
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fputs_unfiltered ("\nEnd of log\n", serial_logfp);
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serial_current_type = 0;
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/* XXX - What if serial_logfp == gdb_stdout or gdb_stderr? */
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delete serial_logfp;
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serial_logfp = NULL;
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}
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/* ensure that the FD has been taken out of async mode. */
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if (scb->async_handler != NULL)
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serial_async (scb, NULL, NULL);
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if (really_close)
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scb->ops->close (scb);
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xfree (scb->name);
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/* For serial_is_open. */
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scb->bufp = NULL;
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if (scb_base == scb)
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scb_base = scb_base->next;
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else
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for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next)
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{
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if (tmp_scb->next != scb)
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continue;
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tmp_scb->next = tmp_scb->next->next;
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break;
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}
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serial_unref (scb);
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}
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void
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serial_close (struct serial *scb)
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{
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do_serial_close (scb, 1);
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}
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void
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serial_un_fdopen (struct serial *scb)
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{
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do_serial_close (scb, 0);
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}
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int
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serial_is_open (struct serial *scb)
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{
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return scb->bufp != NULL;
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}
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void
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serial_ref (struct serial *scb)
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{
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scb->refcnt++;
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}
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void
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serial_unref (struct serial *scb)
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{
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--scb->refcnt;
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if (scb->refcnt == 0)
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xfree (scb);
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}
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int
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serial_readchar (struct serial *scb, int timeout)
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{
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int ch;
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/* FIXME: cagney/1999-10-11: Don't enable this check until the ASYNC
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code is finished. */
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if (0 && serial_is_async_p (scb) && timeout < 0)
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internal_error (__FILE__, __LINE__,
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_("serial_readchar: blocking read in async mode"));
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ch = scb->ops->readchar (scb, timeout);
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if (serial_logfp != NULL)
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{
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serial_logchar (serial_logfp, 'r', ch, timeout);
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/* Make sure that the log file is as up-to-date as possible,
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in case we are getting ready to dump core or something. */
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gdb_flush (serial_logfp);
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}
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if (serial_debug_p (scb))
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{
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fprintf_unfiltered (gdb_stdlog, "[");
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serial_logchar (gdb_stdlog, 'r', ch, timeout);
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fprintf_unfiltered (gdb_stdlog, "]");
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gdb_flush (gdb_stdlog);
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}
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return (ch);
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}
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int
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serial_write (struct serial *scb, const void *buf, size_t count)
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{
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if (serial_logfp != NULL)
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{
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const char *str = (const char *) buf;
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size_t c;
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for (c = 0; c < count; c++)
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serial_logchar (serial_logfp, 'w', str[c] & 0xff, 0);
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/* Make sure that the log file is as up-to-date as possible,
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in case we are getting ready to dump core or something. */
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gdb_flush (serial_logfp);
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}
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if (serial_debug_p (scb))
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{
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const char *str = (const char *) buf;
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size_t c;
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for (c = 0; c < count; c++)
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{
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fprintf_unfiltered (gdb_stdlog, "[");
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serial_logchar (gdb_stdlog, 'w', str[c] & 0xff, 0);
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fprintf_unfiltered (gdb_stdlog, "]");
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}
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gdb_flush (gdb_stdlog);
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}
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return (scb->ops->write (scb, buf, count));
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}
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void
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serial_printf (struct serial *desc, const char *format, ...)
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{
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va_list args;
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va_start (args, format);
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std::string buf = string_vprintf (format, args);
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serial_write (desc, buf.c_str (), buf.length ());
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va_end (args);
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}
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int
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serial_drain_output (struct serial *scb)
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{
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return scb->ops->drain_output (scb);
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}
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int
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serial_flush_output (struct serial *scb)
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{
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return scb->ops->flush_output (scb);
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}
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int
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serial_flush_input (struct serial *scb)
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{
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return scb->ops->flush_input (scb);
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}
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int
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serial_send_break (struct serial *scb)
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{
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if (serial_logfp != NULL)
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serial_logchar (serial_logfp, 'w', SERIAL_BREAK, 0);
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return (scb->ops->send_break (scb));
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}
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void
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serial_raw (struct serial *scb)
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{
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scb->ops->go_raw (scb);
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}
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serial_ttystate
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serial_get_tty_state (struct serial *scb)
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{
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return scb->ops->get_tty_state (scb);
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}
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serial_ttystate
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serial_copy_tty_state (struct serial *scb, serial_ttystate ttystate)
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{
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return scb->ops->copy_tty_state (scb, ttystate);
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}
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int
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serial_set_tty_state (struct serial *scb, serial_ttystate ttystate)
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{
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return scb->ops->set_tty_state (scb, ttystate);
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}
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void
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serial_print_tty_state (struct serial *scb,
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serial_ttystate ttystate,
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struct ui_file *stream)
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{
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scb->ops->print_tty_state (scb, ttystate, stream);
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}
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|
||
int
|
||
serial_setbaudrate (struct serial *scb, int rate)
|
||
{
|
||
return scb->ops->setbaudrate (scb, rate);
|
||
}
|
||
|
||
int
|
||
serial_setstopbits (struct serial *scb, int num)
|
||
{
|
||
return scb->ops->setstopbits (scb, num);
|
||
}
|
||
|
||
/* See serial.h. */
|
||
|
||
int
|
||
serial_setparity (struct serial *scb, int parity)
|
||
{
|
||
return scb->ops->setparity (scb, parity);
|
||
}
|
||
|
||
int
|
||
serial_can_async_p (struct serial *scb)
|
||
{
|
||
return (scb->ops->async != NULL);
|
||
}
|
||
|
||
int
|
||
serial_is_async_p (struct serial *scb)
|
||
{
|
||
return (scb->ops->async != NULL) && (scb->async_handler != NULL);
|
||
}
|
||
|
||
void
|
||
serial_async (struct serial *scb,
|
||
serial_event_ftype *handler,
|
||
void *context)
|
||
{
|
||
int changed = ((scb->async_handler == NULL) != (handler == NULL));
|
||
|
||
scb->async_handler = handler;
|
||
scb->async_context = context;
|
||
/* Only change mode if there is a need. */
|
||
if (changed)
|
||
scb->ops->async (scb, handler != NULL);
|
||
}
|
||
|
||
void
|
||
serial_debug (struct serial *scb, int debug_p)
|
||
{
|
||
scb->debug_p = debug_p;
|
||
}
|
||
|
||
int
|
||
serial_debug_p (struct serial *scb)
|
||
{
|
||
return scb->debug_p || global_serial_debug_p;
|
||
}
|
||
|
||
#ifdef USE_WIN32API
|
||
void
|
||
serial_wait_handle (struct serial *scb, HANDLE *read, HANDLE *except)
|
||
{
|
||
if (scb->ops->wait_handle)
|
||
scb->ops->wait_handle (scb, read, except);
|
||
else
|
||
{
|
||
*read = (HANDLE) _get_osfhandle (scb->fd);
|
||
*except = NULL;
|
||
}
|
||
}
|
||
|
||
void
|
||
serial_done_wait_handle (struct serial *scb)
|
||
{
|
||
if (scb->ops->done_wait_handle)
|
||
scb->ops->done_wait_handle (scb);
|
||
}
|
||
#endif
|
||
|
||
int
|
||
serial_pipe (struct serial *scbs[2])
|
||
{
|
||
const struct serial_ops *ops;
|
||
int fildes[2];
|
||
|
||
ops = serial_interface_lookup ("pipe");
|
||
if (!ops)
|
||
{
|
||
errno = ENOSYS;
|
||
return -1;
|
||
}
|
||
|
||
if (gdb_pipe (fildes) == -1)
|
||
return -1;
|
||
|
||
scbs[0] = serial_fdopen_ops (fildes[0], ops);
|
||
scbs[1] = serial_fdopen_ops (fildes[1], ops);
|
||
return 0;
|
||
}
|
||
|
||
/* Serial set/show framework. */
|
||
|
||
static struct cmd_list_element *serial_set_cmdlist;
|
||
static struct cmd_list_element *serial_show_cmdlist;
|
||
|
||
/* See serial.h. */
|
||
|
||
int baud_rate = -1;
|
||
|
||
static void
|
||
serial_baud_show_cmd (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Baud rate for remote serial I/O is %s.\n"),
|
||
value);
|
||
}
|
||
|
||
/* See serial.h. */
|
||
|
||
int serial_parity = GDBPARITY_NONE;
|
||
|
||
static const char parity_none[] = "none";
|
||
static const char parity_odd[] = "odd";
|
||
static const char parity_even[] = "even";
|
||
static const char *const parity_enums[] =
|
||
{parity_none, parity_odd, parity_even, NULL};
|
||
static const char *parity = parity_none;
|
||
|
||
/* Set serial_parity value. */
|
||
|
||
static void
|
||
set_parity (const char *ignore_args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
if (parity == parity_odd)
|
||
serial_parity = GDBPARITY_ODD;
|
||
else if (parity == parity_even)
|
||
serial_parity = GDBPARITY_EVEN;
|
||
else
|
||
serial_parity = GDBPARITY_NONE;
|
||
}
|
||
|
||
void _initialize_serial ();
|
||
void
|
||
_initialize_serial ()
|
||
{
|
||
#if 0
|
||
add_com ("connect", class_obscure, connect_command, _("\
|
||
Connect the terminal directly up to the command monitor.\n\
|
||
Use <CR>~. or <CR>~^D to break out."));
|
||
#endif /* 0 */
|
||
|
||
add_basic_prefix_cmd ("serial", class_maintenance, _("\
|
||
Set default serial/parallel port configuration."),
|
||
&serial_set_cmdlist,
|
||
0/*allow-unknown*/,
|
||
&setlist);
|
||
|
||
add_show_prefix_cmd ("serial", class_maintenance, _("\
|
||
Show default serial/parallel port configuration."),
|
||
&serial_show_cmdlist,
|
||
0/*allow-unknown*/,
|
||
&showlist);
|
||
|
||
/* If target is open when baud changes, it doesn't take effect until
|
||
the next open (I think, not sure). */
|
||
add_setshow_zinteger_cmd ("baud", no_class, &baud_rate, _("\
|
||
Set baud rate for remote serial I/O."), _("\
|
||
Show baud rate for remote serial I/O."), _("\
|
||
This value is used to set the speed of the serial port when debugging\n\
|
||
using remote targets."),
|
||
NULL,
|
||
serial_baud_show_cmd,
|
||
&serial_set_cmdlist, &serial_show_cmdlist);
|
||
|
||
add_setshow_enum_cmd ("parity", no_class, parity_enums,
|
||
&parity, _("\
|
||
Set parity for remote serial I/O."), _("\
|
||
Show parity for remote serial I/O."), NULL,
|
||
set_parity,
|
||
NULL, /* FIXME: i18n: */
|
||
&serial_set_cmdlist, &serial_show_cmdlist);
|
||
|
||
add_setshow_filename_cmd ("remotelogfile", no_class, &serial_logfile, _("\
|
||
Set filename for remote session recording."), _("\
|
||
Show filename for remote session recording."), _("\
|
||
This file is used to record the remote session for future playback\n\
|
||
by gdbserver."),
|
||
NULL,
|
||
NULL, /* FIXME: i18n: */
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_enum_cmd ("remotelogbase", no_class, logbase_enums,
|
||
&serial_logbase, _("\
|
||
Set numerical base for remote session logging."), _("\
|
||
Show numerical base for remote session logging."), NULL,
|
||
NULL,
|
||
NULL, /* FIXME: i18n: */
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_zuinteger_cmd ("serial", class_maintenance,
|
||
&global_serial_debug_p, _("\
|
||
Set serial debugging."), _("\
|
||
Show serial debugging."), _("\
|
||
When non-zero, serial port debugging is enabled."),
|
||
NULL,
|
||
NULL, /* FIXME: i18n: */
|
||
&setdebuglist, &showdebuglist);
|
||
}
|