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