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021e7609 AC |
1 | /* TUI Interpreter definitions for GDB, the GNU debugger. |
2 | ||
3 | Copyright 2003 Free Software Foundation, Inc. | |
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 | |
9 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "interps.h" | |
24 | #include "top.h" | |
25 | #include "event-top.h" | |
26 | #include "event-loop.h" | |
27 | #include "ui-out.h" | |
28 | #include "tui/tuiData.h" | |
29 | #include "readline/readline.h" | |
30 | #include "tui/tuiWin.h" | |
31 | #include "tui/tui.h" | |
32 | #include "tui/tuiIO.h" | |
33 | ||
63858210 SC |
34 | /* Set to 1 when the TUI mode must be activated when we first start gdb. */ |
35 | static int tui_start_enabled = 0; | |
36 | ||
021e7609 AC |
37 | /* Cleanup the tui before exiting. */ |
38 | ||
39 | static void | |
40 | tui_exit (void) | |
41 | { | |
42 | /* Disable the tui. Curses mode is left leaving the screen | |
43 | in a clean state (see endwin()). */ | |
44 | tui_disable (); | |
45 | } | |
46 | ||
47 | /* These implement the TUI interpreter. */ | |
48 | ||
49 | static void * | |
50 | tui_init (void) | |
51 | { | |
52 | /* Install exit handler to leave the screen in a good shape. */ | |
53 | atexit (tui_exit); | |
54 | ||
55 | initializeStaticData (); | |
56 | ||
57 | tui_initialize_io (); | |
58 | tui_initialize_readline (); | |
59 | ||
60 | return NULL; | |
61 | } | |
62 | ||
63 | static int | |
64 | tui_resume (void *data) | |
65 | { | |
66 | gdb_setup_readline (); | |
63858210 SC |
67 | if (tui_start_enabled) |
68 | tui_enable (); | |
021e7609 AC |
69 | return 1; |
70 | } | |
71 | ||
72 | static int | |
73 | tui_suspend (void *data) | |
74 | { | |
63858210 | 75 | tui_start_enabled = tui_active; |
021e7609 AC |
76 | tui_disable (); |
77 | return 1; | |
78 | } | |
79 | ||
80 | /* Display the prompt if we are silent. */ | |
81 | ||
82 | static int | |
83 | tui_display_prompt_p (void *data) | |
84 | { | |
85 | if (interp_quiet_p (NULL)) | |
86 | return 0; | |
87 | else | |
88 | return 1; | |
89 | } | |
90 | ||
91 | static int | |
92 | tui_exec (void *data, const char *command_str) | |
93 | { | |
94 | internal_error (__FILE__, __LINE__, "tui_exec called"); | |
95 | } | |
96 | ||
97 | ||
98 | /* Initialize all the necessary variables, start the event loop, | |
99 | register readline, and stdin, start the loop. */ | |
100 | ||
101 | static void | |
102 | tui_command_loop (void *data) | |
103 | { | |
104 | int length; | |
105 | char *a_prompt; | |
106 | char *gdb_prompt = get_prompt (); | |
107 | ||
108 | /* If we are using readline, set things up and display the first | |
109 | prompt, otherwise just print the prompt. */ | |
110 | if (async_command_editing_p) | |
111 | { | |
112 | /* Tell readline what the prompt to display is and what function | |
113 | it will need to call after a whole line is read. This also | |
114 | displays the first prompt. */ | |
115 | length = strlen (PREFIX (0)) + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1; | |
116 | a_prompt = (char *) xmalloc (length); | |
117 | strcpy (a_prompt, PREFIX (0)); | |
118 | strcat (a_prompt, gdb_prompt); | |
119 | strcat (a_prompt, SUFFIX (0)); | |
120 | rl_callback_handler_install (a_prompt, input_handler); | |
121 | } | |
122 | else | |
123 | display_gdb_prompt (0); | |
124 | ||
125 | /* Loop until there is nothing to do. This is the entry point to the | |
126 | event loop engine. gdb_do_one_event, called via catch_errors() | |
127 | will process one event for each invocation. It blocks waits for | |
128 | an event and then processes it. >0 when an event is processed, 0 | |
129 | when catch_errors() caught an error and <0 when there are no | |
130 | longer any event sources registered. */ | |
131 | while (1) | |
132 | { | |
133 | int result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL); | |
134 | if (result < 0) | |
135 | break; | |
136 | ||
137 | /* Update gdb output according to TUI mode. Since catch_errors | |
138 | preserves the uiout from changing, this must be done at top | |
139 | level of event loop. */ | |
140 | if (tui_active) | |
141 | uiout = tui_out; | |
142 | else | |
143 | uiout = tui_old_uiout; | |
144 | ||
145 | if (result == 0) | |
146 | { | |
147 | /* FIXME: this should really be a call to a hook that is | |
148 | interface specific, because interfaces can display the | |
149 | prompt in their own way. */ | |
150 | display_gdb_prompt (0); | |
151 | /* This call looks bizarre, but it is required. If the user | |
152 | entered a command that caused an error, | |
153 | after_char_processing_hook won't be called from | |
154 | rl_callback_read_char_wrapper. Using a cleanup there | |
155 | won't work, since we want this function to be called | |
156 | after a new prompt is printed. */ | |
157 | if (after_char_processing_hook) | |
158 | (*after_char_processing_hook) (); | |
159 | /* Maybe better to set a flag to be checked somewhere as to | |
160 | whether display the prompt or not. */ | |
161 | } | |
162 | } | |
163 | ||
164 | /* We are done with the event loop. There are no more event sources | |
165 | to listen to. So we exit GDB. */ | |
166 | return; | |
167 | } | |
168 | ||
169 | void | |
170 | _initialize_tui_interp (void) | |
171 | { | |
172 | static const struct interp_procs procs = { | |
173 | tui_init, | |
174 | tui_resume, | |
175 | tui_suspend, | |
176 | tui_exec, | |
177 | tui_display_prompt_p, | |
178 | tui_command_loop, | |
179 | }; | |
180 | struct interp *tui_interp; | |
181 | ||
182 | /* Create a default uiout builder for the TUI. */ | |
183 | tui_out = tui_out_new (gdb_stdout); | |
184 | interp_add (interp_new ("tui", NULL, tui_out, &procs)); | |
63858210 SC |
185 | if (interpreter_p && strcmp (interpreter_p, "tui") == 0) |
186 | tui_start_enabled = 1; | |
187 | ||
188 | if (interpreter_p && strcmp (interpreter_p, INTERP_CONSOLE) == 0) | |
189 | { | |
190 | xfree (interpreter_p); | |
191 | interpreter_p = xstrdup ("tui"); | |
192 | } | |
021e7609 | 193 | } |