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021e7609 AC |
1 | /* TUI Interpreter definitions for GDB, the GNU debugger. |
2 | ||
0fb0cc75 | 3 | Copyright (C) 2003, 2007, 2008, 2009 Free Software Foundation, Inc. |
021e7609 AC |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
021e7609 AC |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
021e7609 AC |
19 | |
20 | #include "defs.h" | |
21 | #include "interps.h" | |
22 | #include "top.h" | |
23 | #include "event-top.h" | |
24 | #include "event-loop.h" | |
25 | #include "ui-out.h" | |
95cd630e | 26 | #include "cli-out.h" |
d7b2e967 | 27 | #include "tui/tui-data.h" |
021e7609 | 28 | #include "readline/readline.h" |
d7b2e967 | 29 | #include "tui/tui-win.h" |
021e7609 | 30 | #include "tui/tui.h" |
d7b2e967 | 31 | #include "tui/tui-io.h" |
60250e8b | 32 | #include "exceptions.h" |
021e7609 | 33 | |
1cc6d956 MS |
34 | /* Set to 1 when the TUI mode must be activated when we first start |
35 | gdb. */ | |
63858210 SC |
36 | static int tui_start_enabled = 0; |
37 | ||
021e7609 AC |
38 | /* Cleanup the tui before exiting. */ |
39 | ||
40 | static void | |
41 | tui_exit (void) | |
42 | { | |
1cc6d956 MS |
43 | /* Disable the tui. Curses mode is left leaving the screen in a |
44 | clean state (see endwin()). */ | |
021e7609 AC |
45 | tui_disable (); |
46 | } | |
47 | ||
48 | /* These implement the TUI interpreter. */ | |
49 | ||
50 | static void * | |
683f2885 | 51 | tui_init (int top_level) |
021e7609 AC |
52 | { |
53 | /* Install exit handler to leave the screen in a good shape. */ | |
54 | atexit (tui_exit); | |
55 | ||
dd1abb8c | 56 | tui_initialize_static_data (); |
021e7609 AC |
57 | |
58 | tui_initialize_io (); | |
9612b5ec | 59 | tui_initialize_win (); |
021e7609 AC |
60 | tui_initialize_readline (); |
61 | ||
62 | return NULL; | |
63 | } | |
64 | ||
65 | static int | |
66 | tui_resume (void *data) | |
67 | { | |
95cd630e DJ |
68 | struct ui_file *stream; |
69 | ||
1cc6d956 MS |
70 | /* gdb_setup_readline will change gdb_stdout. If the TUI was |
71 | previously writing to gdb_stdout, then set it to the new | |
72 | gdb_stdout afterwards. */ | |
95cd630e DJ |
73 | |
74 | stream = cli_out_set_stream (tui_old_uiout, gdb_stdout); | |
75 | if (stream != gdb_stdout) | |
76 | { | |
77 | cli_out_set_stream (tui_old_uiout, stream); | |
78 | stream = NULL; | |
79 | } | |
80 | ||
021e7609 | 81 | gdb_setup_readline (); |
95cd630e DJ |
82 | |
83 | if (stream != NULL) | |
84 | cli_out_set_stream (tui_old_uiout, gdb_stdout); | |
85 | ||
63858210 SC |
86 | if (tui_start_enabled) |
87 | tui_enable (); | |
021e7609 AC |
88 | return 1; |
89 | } | |
90 | ||
91 | static int | |
92 | tui_suspend (void *data) | |
93 | { | |
63858210 | 94 | tui_start_enabled = tui_active; |
021e7609 AC |
95 | tui_disable (); |
96 | return 1; | |
97 | } | |
98 | ||
99 | /* Display the prompt if we are silent. */ | |
100 | ||
101 | static int | |
102 | tui_display_prompt_p (void *data) | |
103 | { | |
104 | if (interp_quiet_p (NULL)) | |
105 | return 0; | |
106 | else | |
107 | return 1; | |
108 | } | |
109 | ||
71fff37b | 110 | static struct gdb_exception |
021e7609 AC |
111 | tui_exec (void *data, const char *command_str) |
112 | { | |
e2e0b3e5 | 113 | internal_error (__FILE__, __LINE__, _("tui_exec called")); |
021e7609 AC |
114 | } |
115 | ||
116 | ||
117 | /* Initialize all the necessary variables, start the event loop, | |
118 | register readline, and stdin, start the loop. */ | |
119 | ||
120 | static void | |
121 | tui_command_loop (void *data) | |
122 | { | |
021e7609 AC |
123 | /* If we are using readline, set things up and display the first |
124 | prompt, otherwise just print the prompt. */ | |
125 | if (async_command_editing_p) | |
126 | { | |
2ed23f5f MS |
127 | int length; |
128 | char *a_prompt; | |
129 | char *gdb_prompt = get_prompt (); | |
130 | ||
021e7609 AC |
131 | /* Tell readline what the prompt to display is and what function |
132 | it will need to call after a whole line is read. This also | |
133 | displays the first prompt. */ | |
2ed23f5f MS |
134 | length = strlen (PREFIX (0)) |
135 | + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1; | |
136 | a_prompt = (char *) alloca (length); | |
021e7609 AC |
137 | strcpy (a_prompt, PREFIX (0)); |
138 | strcat (a_prompt, gdb_prompt); | |
139 | strcat (a_prompt, SUFFIX (0)); | |
140 | rl_callback_handler_install (a_prompt, input_handler); | |
141 | } | |
142 | else | |
143 | display_gdb_prompt (0); | |
144 | ||
145 | /* Loop until there is nothing to do. This is the entry point to the | |
146 | event loop engine. gdb_do_one_event, called via catch_errors() | |
147 | will process one event for each invocation. It blocks waits for | |
148 | an event and then processes it. >0 when an event is processed, 0 | |
149 | when catch_errors() caught an error and <0 when there are no | |
150 | longer any event sources registered. */ | |
151 | while (1) | |
152 | { | |
153 | int result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL); | |
154 | if (result < 0) | |
155 | break; | |
156 | ||
157 | /* Update gdb output according to TUI mode. Since catch_errors | |
158 | preserves the uiout from changing, this must be done at top | |
159 | level of event loop. */ | |
160 | if (tui_active) | |
161 | uiout = tui_out; | |
162 | else | |
163 | uiout = tui_old_uiout; | |
164 | ||
165 | if (result == 0) | |
166 | { | |
32c1e744 VP |
167 | /* If any exception escaped to here, we better enable |
168 | stdin. Otherwise, any command that calls async_disable_stdin, | |
169 | and then throws, will leave stdin inoperable. */ | |
712af3be | 170 | async_enable_stdin (); |
021e7609 AC |
171 | /* FIXME: this should really be a call to a hook that is |
172 | interface specific, because interfaces can display the | |
173 | prompt in their own way. */ | |
174 | display_gdb_prompt (0); | |
175 | /* This call looks bizarre, but it is required. If the user | |
176 | entered a command that caused an error, | |
177 | after_char_processing_hook won't be called from | |
178 | rl_callback_read_char_wrapper. Using a cleanup there | |
179 | won't work, since we want this function to be called | |
180 | after a new prompt is printed. */ | |
181 | if (after_char_processing_hook) | |
182 | (*after_char_processing_hook) (); | |
183 | /* Maybe better to set a flag to be checked somewhere as to | |
184 | whether display the prompt or not. */ | |
185 | } | |
186 | } | |
187 | ||
188 | /* We are done with the event loop. There are no more event sources | |
189 | to listen to. So we exit GDB. */ | |
190 | return; | |
191 | } | |
192 | ||
2c0b251b PA |
193 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
194 | extern initialize_file_ftype _initialize_tui_interp; | |
195 | ||
021e7609 AC |
196 | void |
197 | _initialize_tui_interp (void) | |
198 | { | |
199 | static const struct interp_procs procs = { | |
200 | tui_init, | |
201 | tui_resume, | |
202 | tui_suspend, | |
203 | tui_exec, | |
204 | tui_display_prompt_p, | |
205 | tui_command_loop, | |
206 | }; | |
207 | struct interp *tui_interp; | |
208 | ||
1cc6d956 | 209 | /* Create a default uiout builder for the TUI. */ |
021e7609 | 210 | tui_out = tui_out_new (gdb_stdout); |
cc4349ed AS |
211 | interp_add (interp_new (INTERP_TUI, NULL, tui_out, &procs)); |
212 | if (interpreter_p && strcmp (interpreter_p, INTERP_TUI) == 0) | |
63858210 SC |
213 | tui_start_enabled = 1; |
214 | ||
215 | if (interpreter_p && strcmp (interpreter_p, INTERP_CONSOLE) == 0) | |
216 | { | |
217 | xfree (interpreter_p); | |
cc4349ed | 218 | interpreter_p = xstrdup (INTERP_TUI); |
63858210 | 219 | } |
021e7609 | 220 | } |