/* TUI Interpreter definitions for GDB, the GNU debugger. Copyright (C) 2003, 2007, 2008, 2009, 2010, 2011 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 . */ #include "defs.h" #include "interps.h" #include "top.h" #include "event-top.h" #include "event-loop.h" #include "ui-out.h" #include "cli-out.h" #include "tui/tui-data.h" #include "readline/readline.h" #include "tui/tui-win.h" #include "tui/tui.h" #include "tui/tui-io.h" #include "exceptions.h" /* Set to 1 when the TUI mode must be activated when we first start gdb. */ static int tui_start_enabled = 0; /* Cleanup the tui before exiting. */ static void tui_exit (void) { /* Disable the tui. Curses mode is left leaving the screen in a clean state (see endwin()). */ tui_disable (); } /* True if TUI is the top-level interpreter. */ static int tui_is_toplevel = 0; /* These implement the TUI interpreter. */ static void * tui_init (int top_level) { tui_is_toplevel = top_level; /* Install exit handler to leave the screen in a good shape. */ atexit (tui_exit); tui_initialize_static_data (); tui_initialize_io (); tui_initialize_win (); if (ui_file_isatty (gdb_stdout)) tui_initialize_readline (); return NULL; } /* True if enabling the TUI is allowed. Example, if the top level interpreter is MI, enabling curses will certainly lose. */ int tui_allowed_p (void) { /* Only if TUI is the top level interpreter. Also don't try to setup curses (and print funny control characters) if we're not outputting to a terminal. */ return tui_is_toplevel && ui_file_isatty (gdb_stdout); } static int tui_resume (void *data) { struct ui_file *stream; /* gdb_setup_readline will change gdb_stdout. If the TUI was previously writing to gdb_stdout, then set it to the new gdb_stdout afterwards. */ stream = cli_out_set_stream (tui_old_uiout, gdb_stdout); if (stream != gdb_stdout) { cli_out_set_stream (tui_old_uiout, stream); stream = NULL; } gdb_setup_readline (); if (stream != NULL) cli_out_set_stream (tui_old_uiout, gdb_stdout); if (tui_start_enabled) tui_enable (); return 1; } static int tui_suspend (void *data) { tui_start_enabled = tui_active; tui_disable (); return 1; } /* Display the prompt if we are silent. */ static int tui_display_prompt_p (void *data) { if (interp_quiet_p (NULL)) return 0; else return 1; } static struct gdb_exception tui_exec (void *data, const char *command_str) { internal_error (__FILE__, __LINE__, _("tui_exec called")); } /* Initialize all the necessary variables, start the event loop, register readline, and stdin, start the loop. */ static void tui_command_loop (void *data) { /* If we are using readline, set things up and display the first prompt, otherwise just print the prompt. */ if (async_command_editing_p) { int length; char *a_prompt; char *gdb_prompt = get_prompt (0); /* Tell readline what the prompt to display is and what function it will need to call after a whole line is read. This also displays the first prompt. */ length = strlen (get_prefix (0)) + strlen (gdb_prompt) + strlen (get_suffix (0)) + 1; a_prompt = (char *) alloca (length); strcpy (a_prompt, get_prefix (0)); strcat (a_prompt, gdb_prompt); strcat (a_prompt, get_suffix (0)); rl_callback_handler_install (a_prompt, input_handler); } else display_gdb_prompt (0); /* Loop until there is nothing to do. This is the entry point to the event loop engine. gdb_do_one_event, called via catch_errors() will process one event for each invocation. It blocks waits for an event and then processes it. >0 when an event is processed, 0 when catch_errors() caught an error and <0 when there are no longer any event sources registered. */ while (1) { int result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL); if (result < 0) break; /* Update gdb output according to TUI mode. Since catch_errors preserves the uiout from changing, this must be done at top level of event loop. */ if (tui_active) uiout = tui_out; else uiout = tui_old_uiout; if (result == 0) { /* 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 (); /* FIXME: this should really be a call to a hook that is interface specific, because interfaces can display the prompt in their own way. */ display_gdb_prompt (0); /* 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. */ } } /* We are done with the event loop. There are no more event sources to listen to. So we exit GDB. */ return; } /* Provide a prototype to silence -Wmissing-prototypes. */ extern initialize_file_ftype _initialize_tui_interp; void _initialize_tui_interp (void) { static const struct interp_procs procs = { tui_init, tui_resume, tui_suspend, tui_exec, tui_display_prompt_p, tui_command_loop, }; /* Create a default uiout builder for the TUI. */ tui_out = tui_out_new (gdb_stdout); interp_add (interp_new (INTERP_TUI, NULL, tui_out, &procs)); if (interpreter_p && strcmp (interpreter_p, INTERP_TUI) == 0) tui_start_enabled = 1; if (interpreter_p && strcmp (interpreter_p, INTERP_CONSOLE) == 0) { xfree (interpreter_p); interpreter_p = xstrdup (INTERP_TUI); } }