c4ef48c6b2
This patch teaches the TUI to resize itself asynchronously instead of synchronously. Asynchronously resizing the screen when the underlying terminal gets resized is the more intuitive behavior and is surprisingly simple to implement thanks to GDB's async infrastructure. The implementation is straightforward. TUI's SIGWINCH handler is just tweaked to asynchronously invoke a new callback, tui_async_resize_screen, which is responsible for safely resizing the screen. Care must be taken to not to attempt to asynchronously resize the screen while the TUI is not active. When the TUI is not active, the callback will do nothing, but the screen will yet be resized in the next call to tui_enable() by virtue of win_resized being TRUE. (So, after the patch there are still two places where the screen gets resized: one in tui_enable() and the other now in tui_async_resize_screen() as opposed to being in tui_handle_resize_during_io(). The one in tui_enable() is still necessary to handle the case where the terminal gets resized inside the CLI: in that case, the TUI still needs resizing, but it must wait until the TUI gets re-enabled.) gdb/ChangeLog: * tui/tui-io.c (tui_handle_resize_during_io): Remove this function. (tui_putc): Don't call tui_handle_resize_during_io. (tui_getc): Likewise. (tui_mld_getc): Likewise. * tui/tui-win.c: Include event-loop.h and tui/tui-io.h. (tui_sigwinch_token): New static variable. (tui_initialize_win): Adjust documentation. Set tui_sigwinch_token. (tui_async_resize_screen): New asynchronous callback. (tui_sigwinch_handler): Adjust documentation. Asynchronously invoke tui_async_resize_screen.
716 lines
19 KiB
C
716 lines
19 KiB
C
/* TUI support I/O functions.
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Copyright (C) 1998-2015 Free Software Foundation, Inc.
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Contributed by Hewlett-Packard Company.
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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 "target.h"
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#include "event-loop.h"
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#include "event-top.h"
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#include "command.h"
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#include "top.h"
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#include "tui/tui.h"
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#include "tui/tui-data.h"
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#include "tui/tui-io.h"
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#include "tui/tui-command.h"
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#include "tui/tui-win.h"
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#include "tui/tui-wingeneral.h"
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#include "tui/tui-file.h"
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#include "ui-out.h"
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#include "cli-out.h"
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#include <fcntl.h>
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#include <signal.h>
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#include "filestuff.h"
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#include "completer.h"
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#include "gdb_curses.h"
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/* This redefines CTRL if it is not already defined, so it must come
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after terminal state releated include files like <term.h> and
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"gdb_curses.h". */
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#include "readline/readline.h"
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int
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key_is_start_sequence (int ch)
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{
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return (ch == 27);
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}
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int
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key_is_end_sequence (int ch)
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{
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return (ch == 126);
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}
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int
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key_is_backspace (int ch)
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{
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return (ch == 8);
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}
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/* Use definition from readline 4.3. */
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#undef CTRL_CHAR
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#define CTRL_CHAR(c) \
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((c) < control_character_threshold && (((c) & 0x80) == 0))
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/* This file controls the IO interactions between gdb and curses.
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When the TUI is enabled, gdb has two modes a curses and a standard
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mode.
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In curses mode, the gdb outputs are made in a curses command
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window. For this, the gdb_stdout and gdb_stderr are redirected to
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the specific ui_file implemented by TUI. The output is handled by
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tui_puts(). The input is also controlled by curses with
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tui_getc(). The readline library uses this function to get its
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input. Several readline hooks are installed to redirect readline
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output to the TUI (see also the note below).
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In normal mode, the gdb outputs are restored to their origin, that
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is as if TUI is not used. Readline also uses its original getc()
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function with stdin.
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Note SCz/2001-07-21: the current readline is not clean in its
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management of the output. Even if we install a redisplay handler,
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it sometimes writes on a stdout file. It is important to redirect
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every output produced by readline, otherwise the curses window will
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be garbled. This is implemented with a pipe that TUI reads and
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readline writes to. A gdb input handler is created so that reading
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the pipe is handled automatically. This will probably not work on
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non-Unix platforms. The best fix is to make readline clean enougth
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so that is never write on stdout.
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Note SCz/2002-09-01: we now use more readline hooks and it seems
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that with them we don't need the pipe anymore (verified by creating
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the pipe and closing its end so that write causes a SIGPIPE). The
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old pipe code is still there and can be conditionally removed by
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#undef TUI_USE_PIPE_FOR_READLINE. */
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/* For gdb 5.3, prefer to continue the pipe hack as a backup wheel. */
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#ifdef HAVE_PIPE
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#define TUI_USE_PIPE_FOR_READLINE
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#endif
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/* #undef TUI_USE_PIPE_FOR_READLINE */
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/* TUI output files. */
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static struct ui_file *tui_stdout;
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static struct ui_file *tui_stderr;
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struct ui_out *tui_out;
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/* GDB output files in non-curses mode. */
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static struct ui_file *tui_old_stdout;
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static struct ui_file *tui_old_stderr;
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struct ui_out *tui_old_uiout;
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/* Readline previous hooks. */
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static rl_getc_func_t *tui_old_rl_getc_function;
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static rl_voidfunc_t *tui_old_rl_redisplay_function;
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static rl_vintfunc_t *tui_old_rl_prep_terminal;
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static rl_voidfunc_t *tui_old_rl_deprep_terminal;
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static rl_compdisp_func_t *tui_old_rl_display_matches_hook;
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static int tui_old_rl_echoing_p;
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/* Readline output stream.
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Should be removed when readline is clean. */
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static FILE *tui_rl_outstream;
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static FILE *tui_old_rl_outstream;
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#ifdef TUI_USE_PIPE_FOR_READLINE
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static int tui_readline_pipe[2];
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#endif
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/* The last gdb prompt that was registered in readline.
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This may be the main gdb prompt or a secondary prompt. */
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static char *tui_rl_saved_prompt;
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static void
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tui_putc (char c)
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{
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char buf[2];
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buf[0] = c;
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buf[1] = 0;
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tui_puts (buf);
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}
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/* Print the string in the curses command window.
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The output is buffered. It is up to the caller to refresh the screen
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if necessary. */
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void
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tui_puts (const char *string)
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{
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static int tui_skip_line = -1;
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char c;
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WINDOW *w;
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w = TUI_CMD_WIN->generic.handle;
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while ((c = *string++) != 0)
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{
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/* Catch annotation and discard them. We need two \032 and
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discard until a \n is seen. */
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if (c == '\032')
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{
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tui_skip_line++;
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}
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else if (tui_skip_line != 1)
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{
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tui_skip_line = -1;
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/* Expand TABs, since ncurses on MS-Windows doesn't. */
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if (c == '\t')
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{
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int line, col;
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getyx (w, line, col);
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do
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{
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waddch (w, ' ');
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col++;
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} while ((col % 8) != 0);
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}
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else
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waddch (w, c);
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}
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else if (c == '\n')
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tui_skip_line = -1;
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}
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getyx (w, TUI_CMD_WIN->detail.command_info.cur_line,
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TUI_CMD_WIN->detail.command_info.curch);
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TUI_CMD_WIN->detail.command_info.start_line
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= TUI_CMD_WIN->detail.command_info.cur_line;
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}
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/* Readline callback.
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Redisplay the command line with its prompt after readline has
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changed the edited text. */
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void
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tui_redisplay_readline (void)
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{
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int prev_col;
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int height;
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int col, line;
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int c_pos;
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int c_line;
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int in;
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WINDOW *w;
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char *prompt;
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int start_line;
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/* Detect when we temporarily left SingleKey and now the readline
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edit buffer is empty, automatically restore the SingleKey
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mode. The restore must only be done if the command has finished.
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The command could call prompt_for_continue and we must not
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restore SingleKey so that the prompt and normal keymap are used. */
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if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0
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&& immediate_quit == 0)
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tui_set_key_mode (TUI_SINGLE_KEY_MODE);
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if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
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prompt = "";
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else
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prompt = tui_rl_saved_prompt;
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c_pos = -1;
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c_line = -1;
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w = TUI_CMD_WIN->generic.handle;
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start_line = TUI_CMD_WIN->detail.command_info.start_line;
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wmove (w, start_line, 0);
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prev_col = 0;
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height = 1;
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for (in = 0; prompt && prompt[in]; in++)
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{
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waddch (w, prompt[in]);
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getyx (w, line, col);
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if (col <= prev_col)
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height++;
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prev_col = col;
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}
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for (in = 0; in <= rl_end; in++)
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{
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unsigned char c;
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if (in == rl_point)
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{
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getyx (w, c_line, c_pos);
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}
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if (in == rl_end)
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break;
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c = (unsigned char) rl_line_buffer[in];
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if (CTRL_CHAR (c) || c == RUBOUT)
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{
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waddch (w, '^');
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waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?');
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}
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else if (c == '\t')
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{
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/* Expand TABs, since ncurses on MS-Windows doesn't. */
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getyx (w, line, col);
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do
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{
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waddch (w, ' ');
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col++;
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} while ((col % 8) != 0);
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}
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else
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{
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waddch (w, c);
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}
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if (c == '\n')
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{
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getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
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TUI_CMD_WIN->detail.command_info.curch);
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}
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getyx (w, line, col);
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if (col < prev_col)
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height++;
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prev_col = col;
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}
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wclrtobot (w);
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getyx (w, TUI_CMD_WIN->detail.command_info.start_line,
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TUI_CMD_WIN->detail.command_info.curch);
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if (c_line >= 0)
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{
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wmove (w, c_line, c_pos);
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TUI_CMD_WIN->detail.command_info.cur_line = c_line;
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TUI_CMD_WIN->detail.command_info.curch = c_pos;
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}
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TUI_CMD_WIN->detail.command_info.start_line -= height - 1;
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wrefresh (w);
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fflush(stdout);
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}
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/* Readline callback to prepare the terminal. It is called once each
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time we enter readline. Terminal is already setup in curses
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mode. */
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static void
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tui_prep_terminal (int notused1)
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{
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/* Save the prompt registered in readline to correctly display it.
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(we can't use gdb_prompt() due to secondary prompts and can't use
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rl_prompt because it points to an alloca buffer). */
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xfree (tui_rl_saved_prompt);
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tui_rl_saved_prompt = rl_prompt != NULL ? xstrdup (rl_prompt) : NULL;
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}
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/* Readline callback to restore the terminal. It is called once each
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time we leave readline. There is nothing to do in curses mode. */
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static void
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tui_deprep_terminal (void)
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{
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}
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#ifdef TUI_USE_PIPE_FOR_READLINE
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/* Read readline output pipe and feed the command window with it.
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Should be removed when readline is clean. */
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static void
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tui_readline_output (int error, gdb_client_data data)
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{
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int size;
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char buf[256];
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size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1);
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if (size > 0 && tui_active)
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{
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buf[size] = 0;
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tui_puts (buf);
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}
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}
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#endif
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/* TUI version of displayer.crlf. */
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static void
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tui_mld_crlf (const struct match_list_displayer *displayer)
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{
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tui_putc ('\n');
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}
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/* TUI version of displayer.putch. */
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static void
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tui_mld_putch (const struct match_list_displayer *displayer, int ch)
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{
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tui_putc (ch);
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}
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/* TUI version of displayer.puts. */
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static void
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tui_mld_puts (const struct match_list_displayer *displayer, const char *s)
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{
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tui_puts (s);
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}
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/* TUI version of displayer.flush. */
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static void
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tui_mld_flush (const struct match_list_displayer *displayer)
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{
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wrefresh (TUI_CMD_WIN->generic.handle);
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}
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/* TUI version of displayer.erase_entire_line. */
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static void
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tui_mld_erase_entire_line (const struct match_list_displayer *displayer)
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{
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WINDOW *w = TUI_CMD_WIN->generic.handle;
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wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
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wclrtoeol (w);
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wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
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}
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/* TUI version of displayer.beep. */
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static void
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tui_mld_beep (const struct match_list_displayer *displayer)
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{
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beep ();
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}
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/* Helper function for tui_mld_read_key.
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This temporarily replaces tui_getc for use during tab-completion
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match list display. */
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static int
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tui_mld_getc (FILE *fp)
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{
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WINDOW *w = TUI_CMD_WIN->generic.handle;
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int c = wgetch (w);
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return c;
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}
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/* TUI version of displayer.read_key. */
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static int
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tui_mld_read_key (const struct match_list_displayer *displayer)
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{
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rl_getc_func_t *prev = rl_getc_function;
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int c;
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/* We can't use tui_getc as we need NEWLINE to not get emitted. */
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rl_getc_function = tui_mld_getc;
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c = rl_read_key ();
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rl_getc_function = prev;
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return c;
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}
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/* TUI version of rl_completion_display_matches_hook.
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See gdb_display_match_list for a description of the arguments. */
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static void
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tui_rl_display_match_list (char **matches, int len, int max)
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{
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struct match_list_displayer displayer;
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rl_get_screen_size (&displayer.height, &displayer.width);
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displayer.crlf = tui_mld_crlf;
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displayer.putch = tui_mld_putch;
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displayer.puts = tui_mld_puts;
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displayer.flush = tui_mld_flush;
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displayer.erase_entire_line = tui_mld_erase_entire_line;
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displayer.beep = tui_mld_beep;
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displayer.read_key = tui_mld_read_key;
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gdb_display_match_list (matches, len, max, &displayer);
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}
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/* Setup the IO for curses or non-curses mode.
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- In non-curses mode, readline and gdb use the standard input and
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standard output/error directly.
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- In curses mode, the standard output/error is controlled by TUI
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with the tui_stdout and tui_stderr. The output is redirected in
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the curses command window. Several readline callbacks are installed
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so that readline asks for its input to the curses command window
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with wgetch(). */
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void
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tui_setup_io (int mode)
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{
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extern int _rl_echoing_p;
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if (mode)
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{
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/* Redirect readline to TUI. */
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tui_old_rl_redisplay_function = rl_redisplay_function;
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tui_old_rl_deprep_terminal = rl_deprep_term_function;
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tui_old_rl_prep_terminal = rl_prep_term_function;
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tui_old_rl_getc_function = rl_getc_function;
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tui_old_rl_display_matches_hook = rl_completion_display_matches_hook;
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tui_old_rl_outstream = rl_outstream;
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tui_old_rl_echoing_p = _rl_echoing_p;
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rl_redisplay_function = tui_redisplay_readline;
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rl_deprep_term_function = tui_deprep_terminal;
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rl_prep_term_function = tui_prep_terminal;
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rl_getc_function = tui_getc;
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_rl_echoing_p = 0;
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rl_outstream = tui_rl_outstream;
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rl_prompt = 0;
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rl_completion_display_matches_hook = tui_rl_display_match_list;
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rl_already_prompted = 0;
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/* Keep track of previous gdb output. */
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tui_old_stdout = gdb_stdout;
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tui_old_stderr = gdb_stderr;
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tui_old_uiout = current_uiout;
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/* Reconfigure gdb output. */
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gdb_stdout = tui_stdout;
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gdb_stderr = tui_stderr;
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gdb_stdlog = gdb_stdout; /* for moment */
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gdb_stdtarg = gdb_stderr; /* for moment */
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gdb_stdtargerr = gdb_stderr; /* for moment */
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current_uiout = tui_out;
|
|
|
|
/* Save tty for SIGCONT. */
|
|
savetty ();
|
|
}
|
|
else
|
|
{
|
|
/* Restore gdb output. */
|
|
gdb_stdout = tui_old_stdout;
|
|
gdb_stderr = tui_old_stderr;
|
|
gdb_stdlog = gdb_stdout; /* for moment */
|
|
gdb_stdtarg = gdb_stderr; /* for moment */
|
|
gdb_stdtargerr = gdb_stderr; /* for moment */
|
|
current_uiout = tui_old_uiout;
|
|
|
|
/* Restore readline. */
|
|
rl_redisplay_function = tui_old_rl_redisplay_function;
|
|
rl_deprep_term_function = tui_old_rl_deprep_terminal;
|
|
rl_prep_term_function = tui_old_rl_prep_terminal;
|
|
rl_getc_function = tui_old_rl_getc_function;
|
|
rl_completion_display_matches_hook = tui_old_rl_display_matches_hook;
|
|
rl_outstream = tui_old_rl_outstream;
|
|
_rl_echoing_p = tui_old_rl_echoing_p;
|
|
rl_already_prompted = 0;
|
|
|
|
/* Save tty for SIGCONT. */
|
|
savetty ();
|
|
}
|
|
}
|
|
|
|
#ifdef SIGCONT
|
|
/* Catch SIGCONT to restore the terminal and refresh the screen. */
|
|
static void
|
|
tui_cont_sig (int sig)
|
|
{
|
|
if (tui_active)
|
|
{
|
|
/* Restore the terminal setting because another process (shell)
|
|
might have changed it. */
|
|
resetty ();
|
|
|
|
/* Force a refresh of the screen. */
|
|
tui_refresh_all_win ();
|
|
|
|
/* Update cursor position on the screen. */
|
|
wmove (TUI_CMD_WIN->generic.handle,
|
|
TUI_CMD_WIN->detail.command_info.start_line,
|
|
TUI_CMD_WIN->detail.command_info.curch);
|
|
wrefresh (TUI_CMD_WIN->generic.handle);
|
|
}
|
|
signal (sig, tui_cont_sig);
|
|
}
|
|
#endif
|
|
|
|
/* Initialize the IO for gdb in curses mode. */
|
|
void
|
|
tui_initialize_io (void)
|
|
{
|
|
#ifdef SIGCONT
|
|
signal (SIGCONT, tui_cont_sig);
|
|
#endif
|
|
|
|
/* Create tui output streams. */
|
|
tui_stdout = tui_fileopen (stdout);
|
|
tui_stderr = tui_fileopen (stderr);
|
|
tui_out = tui_out_new (tui_stdout);
|
|
|
|
/* Create the default UI. */
|
|
tui_old_uiout = cli_out_new (gdb_stdout);
|
|
|
|
#ifdef TUI_USE_PIPE_FOR_READLINE
|
|
/* Temporary solution for readline writing to stdout: redirect
|
|
readline output in a pipe, read that pipe and output the content
|
|
in the curses command window. */
|
|
if (gdb_pipe_cloexec (tui_readline_pipe) != 0)
|
|
error (_("Cannot create pipe for readline"));
|
|
|
|
tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
|
|
if (tui_rl_outstream == 0)
|
|
error (_("Cannot redirect readline output"));
|
|
|
|
setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
|
|
|
|
#ifdef O_NONBLOCK
|
|
(void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
|
|
#else
|
|
#ifdef O_NDELAY
|
|
(void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
|
|
#endif
|
|
#endif
|
|
add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
|
|
#else
|
|
tui_rl_outstream = stdout;
|
|
#endif
|
|
}
|
|
|
|
/* Get a character from the command window. This is called from the
|
|
readline package. */
|
|
int
|
|
tui_getc (FILE *fp)
|
|
{
|
|
int ch;
|
|
WINDOW *w;
|
|
|
|
w = TUI_CMD_WIN->generic.handle;
|
|
|
|
#ifdef TUI_USE_PIPE_FOR_READLINE
|
|
/* Flush readline output. */
|
|
tui_readline_output (0, 0);
|
|
#endif
|
|
|
|
ch = wgetch (w);
|
|
|
|
/* The \n must be echoed because it will not be printed by
|
|
readline. */
|
|
if (ch == '\n')
|
|
{
|
|
/* When hitting return with an empty input, gdb executes the last
|
|
command. If we emit a newline, this fills up the command window
|
|
with empty lines with gdb prompt at beginning. Instead of that,
|
|
stay on the same line but provide a visual effect to show the
|
|
user we recognized the command. */
|
|
if (rl_end == 0)
|
|
{
|
|
wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
|
|
|
|
/* Clear the line. This will blink the gdb prompt since
|
|
it will be redrawn at the same line. */
|
|
wclrtoeol (w);
|
|
wrefresh (w);
|
|
napms (20);
|
|
}
|
|
else
|
|
{
|
|
/* Move cursor to the end of the command line before emitting the
|
|
newline. We need to do so because when ncurses outputs a newline
|
|
it truncates any text that appears past the end of the cursor. */
|
|
int px = TUI_CMD_WIN->detail.command_info.curch;
|
|
int py = TUI_CMD_WIN->detail.command_info.cur_line;
|
|
px += rl_end - rl_point;
|
|
py += px / TUI_CMD_WIN->generic.width;
|
|
px %= TUI_CMD_WIN->generic.width;
|
|
wmove (w, py, px);
|
|
waddch (w, ch);
|
|
}
|
|
}
|
|
|
|
/* Handle prev/next/up/down here. */
|
|
ch = tui_dispatch_ctrl_char (ch);
|
|
|
|
if (ch == '\n' || ch == '\r' || ch == '\f')
|
|
TUI_CMD_WIN->detail.command_info.curch = 0;
|
|
if (ch == KEY_BACKSPACE)
|
|
return '\b';
|
|
|
|
if (async_command_editing_p && key_is_start_sequence (ch))
|
|
{
|
|
int ch_pending;
|
|
|
|
nodelay (w, TRUE);
|
|
ch_pending = wgetch (w);
|
|
nodelay (w, FALSE);
|
|
|
|
/* If we have pending input following a start sequence, call the stdin
|
|
event handler again because ncurses may have already read and stored
|
|
the input into its internal buffer, meaning that we won't get an stdin
|
|
event for it. If we don't compensate for this missed stdin event, key
|
|
sequences as Alt_F (^[f) will not behave promptly.
|
|
|
|
(We only compensates for the missed 2nd byte of a key sequence because
|
|
2-byte sequences are by far the most commonly used. ncurses may have
|
|
buffered a larger, 3+-byte key sequence though it remains to be seen
|
|
whether it is useful to compensate for all the bytes of such
|
|
sequences.) */
|
|
if (ch_pending != ERR)
|
|
{
|
|
ungetch (ch_pending);
|
|
call_stdin_event_handler_again_p = 1;
|
|
}
|
|
}
|
|
|
|
return ch;
|
|
}
|
|
|
|
/* Utility function to expand TABs in a STRING into spaces. STRING
|
|
will be displayed starting at column COL, and is assumed to include
|
|
no newlines. The returned expanded string is malloc'ed. */
|
|
|
|
char *
|
|
tui_expand_tabs (const char *string, int col)
|
|
{
|
|
int n_adjust;
|
|
const char *s;
|
|
char *ret, *q;
|
|
|
|
/* 1. How many additional characters do we need? */
|
|
for (n_adjust = 0, s = string; s; )
|
|
{
|
|
s = strpbrk (s, "\t");
|
|
if (s)
|
|
{
|
|
col += (s - string) + n_adjust;
|
|
/* Adjustment for the next tab stop, minus one for the TAB
|
|
we replace with spaces. */
|
|
n_adjust += 8 - (col % 8) - 1;
|
|
s++;
|
|
}
|
|
}
|
|
|
|
/* Allocate the copy. */
|
|
ret = q = xmalloc (strlen (string) + n_adjust + 1);
|
|
|
|
/* 2. Copy the original string while replacing TABs with spaces. */
|
|
for (s = string; s; )
|
|
{
|
|
char *s1 = strpbrk (s, "\t");
|
|
if (s1)
|
|
{
|
|
if (s1 > s)
|
|
{
|
|
strncpy (q, s, s1 - s);
|
|
q += s1 - s;
|
|
col += s1 - s;
|
|
}
|
|
do {
|
|
*q++ = ' ';
|
|
col++;
|
|
} while ((col % 8) != 0);
|
|
s1++;
|
|
}
|
|
else
|
|
strcpy (q, s);
|
|
s = s1;
|
|
}
|
|
|
|
return ret;
|
|
}
|