Commit | Line | Data |
---|---|---|
b5a0ac70 SS |
1 | /* Top level stuff for GDB, the GNU debugger. |
2 | Copyright 1999 Free Software Foundation, Inc. | |
3 | Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions. | |
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 | |
c5aa993b JM |
19 | Foundation, Inc., 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
b5a0ac70 SS |
21 | |
22 | #include "defs.h" | |
0f71a2f6 | 23 | #include "top.h" |
b5a0ac70 | 24 | #include "inferior.h" |
c5aa993b | 25 | #include "terminal.h" /* for job_control */ |
9e0b60a8 JM |
26 | #include <signal.h> |
27 | #include "event-loop.h" | |
b5a0ac70 SS |
28 | |
29 | /* readline include files */ | |
30 | #include <readline/readline.h> | |
31 | #include <readline/history.h> | |
32 | ||
33 | /* readline defines this. */ | |
34 | #undef savestring | |
35 | ||
9e0b60a8 | 36 | extern void _initialize_event_loop PARAMS ((void)); |
b5a0ac70 SS |
37 | |
38 | static void command_line_handler PARAMS ((char *)); | |
43ff13b4 | 39 | static void command_line_handler_continuation PARAMS ((struct continuation_arg *)); |
085dd6e6 | 40 | void gdb_readline2 PARAMS ((void)); |
43ff13b4 JM |
41 | void pop_prompt PARAMS ((void)); |
42 | void push_prompt PARAMS ((char *, char *, char *)); | |
392a587b JM |
43 | static void change_line_handler PARAMS ((void)); |
44 | static void change_annotation_level PARAMS ((void)); | |
45 | static void command_handler PARAMS ((char *)); | |
b5a0ac70 SS |
46 | |
47 | /* Signal handlers. */ | |
43ff13b4 | 48 | void handle_sigint PARAMS ((int)); |
0f71a2f6 JM |
49 | static void handle_sigquit PARAMS ((int)); |
50 | static void handle_sighup PARAMS ((int)); | |
51 | static void handle_sigfpe PARAMS ((int)); | |
52 | static void handle_sigwinch PARAMS ((int)); | |
53 | /* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT. */ | |
54 | #ifndef STOP_SIGNAL | |
55 | #ifdef SIGTSTP | |
56 | #define STOP_SIGNAL SIGTSTP | |
57 | void handle_stop_sig PARAMS ((int)); | |
58 | #endif | |
59 | #endif | |
b5a0ac70 SS |
60 | |
61 | /* Functions to be invoked by the event loop in response to | |
62 | signals. */ | |
0f71a2f6 JM |
63 | void async_request_quit PARAMS ((gdb_client_data)); |
64 | static void async_do_nothing PARAMS ((gdb_client_data)); | |
65 | static void async_disconnect PARAMS ((gdb_client_data)); | |
66 | static void async_float_handler PARAMS ((gdb_client_data)); | |
67 | static void async_stop_sig PARAMS ((gdb_client_data)); | |
b5a0ac70 SS |
68 | |
69 | /* If this definition isn't overridden by the header files, assume | |
70 | that isatty and fileno exist on this system. */ | |
71 | #ifndef ISATTY | |
72 | #define ISATTY(FP) (isatty (fileno (FP))) | |
73 | #endif | |
74 | ||
b5a0ac70 SS |
75 | /* Readline offers an alternate interface, via callback |
76 | functions. These are all included in the file callback.c in the | |
77 | readline distribution. This file provides (mainly) a function, which | |
78 | the event loop uses as callback (i.e. event handler) whenever an event | |
79 | is detected on the standard input file descriptor. | |
80 | readline_callback_read_char is called (by the GDB event loop) whenever | |
81 | there is a new character ready on the input stream. This function | |
82 | incrementally builds a buffer internal to readline where it | |
83 | accumulates the line read up to the point of invocation. In the | |
84 | special case in which the character read is newline, the function | |
85 | invokes a GDB supplied callback routine, which does the processing of | |
86 | a full command line. This latter routine is the asynchronous analog | |
87 | of the old command_line_input in gdb. Instead of invoking (and waiting | |
88 | for) readline to read the command line and pass it back to | |
89 | command_loop for processing, the new command_line_handler function has | |
90 | the command line already available as its parameter. INPUT_HANDLER is | |
91 | to be set to the function that readline will invoke when a complete | |
92 | line of input is ready. CALL_READLINE is to be set to the function | |
93 | that readline offers as callback to the event_loop. */ | |
94 | ||
95 | void (*input_handler) PARAMS ((char *)); | |
96 | void (*call_readline) PARAMS ((void)); | |
97 | ||
98 | /* Important variables for the event loop. */ | |
99 | ||
100 | /* This is used to determine if GDB is using the readline library or | |
101 | its own simplified form of readline. It is used by the asynchronous | |
0f71a2f6 | 102 | form of the set editing command. |
392a587b | 103 | ezannoni: as of 1999-04-29 I expect that this |
b5a0ac70 SS |
104 | variable will not be used after gdb is changed to use the event |
105 | loop as default engine, and event-top.c is merged into top.c. */ | |
106 | int async_command_editing_p; | |
107 | ||
108 | /* This variable contains the new prompt that the user sets with the | |
109 | set prompt command. */ | |
110 | char *new_async_prompt; | |
111 | ||
112 | /* This is the annotation suffix that will be used when the | |
113 | annotation_level is 2. */ | |
114 | char *async_annotation_suffix; | |
115 | ||
116 | /* This is the file descriptor for the input stream that GDB uses to | |
117 | read commands from. */ | |
118 | int input_fd; | |
119 | ||
120 | /* This is the prompt stack. Prompts will be pushed on the stack as | |
121 | needed by the different 'kinds' of user inputs GDB is asking | |
122 | for. See event-loop.h. */ | |
123 | struct prompts the_prompts; | |
124 | ||
125 | /* signal handling variables */ | |
126 | /* Each of these is a pointer to a function that the event loop will | |
127 | invoke if the corresponding signal has received. The real signal | |
128 | handlers mark these functions as ready to be executed and the event | |
129 | loop, in a later iteration, calls them. See the function | |
130 | invoke_async_signal_handler. */ | |
0f71a2f6 | 131 | PTR sigint_token; |
b5a0ac70 | 132 | #ifdef SIGHUP |
0f71a2f6 | 133 | PTR sighup_token; |
b5a0ac70 | 134 | #endif |
0f71a2f6 JM |
135 | PTR sigquit_token; |
136 | PTR sigfpe_token; | |
b5a0ac70 | 137 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
0f71a2f6 | 138 | PTR sigwinch_token; |
b5a0ac70 | 139 | #endif |
0f71a2f6 JM |
140 | #ifdef STOP_SIGNAL |
141 | PTR sigtstp_token; | |
142 | #endif | |
143 | ||
144 | void mark_async_signal_handler_wrapper PARAMS ((void *)); | |
b5a0ac70 SS |
145 | |
146 | /* Structure to save a partially entered command. This is used when | |
147 | the user types '\' at the end of a command line. This is necessary | |
148 | because each line of input is handled by a different call to | |
149 | command_line_handler, and normally there is no state retained | |
150 | between different calls. */ | |
151 | int more_to_come = 0; | |
152 | ||
153 | struct readline_input_state | |
154 | { | |
155 | char *linebuffer; | |
156 | char *linebuffer_ptr; | |
157 | } | |
158 | readline_input_state; | |
159 | \f | |
160 | ||
161 | /* Initialize all the necessary variables, start the event loop, | |
085dd6e6 | 162 | register readline, and stdin, start the loop. */ |
b5a0ac70 | 163 | void |
085dd6e6 | 164 | cli_command_loop () |
b5a0ac70 | 165 | { |
0f71a2f6 JM |
166 | int length; |
167 | char *a_prompt; | |
9e0b60a8 | 168 | char *gdb_prompt = get_prompt (); |
b5a0ac70 | 169 | |
0f71a2f6 JM |
170 | /* If we are using readline, set things up and display the first |
171 | prompt, otherwise just print the prompt. */ | |
172 | if (async_command_editing_p) | |
173 | { | |
174 | /* Tell readline what the prompt to display is and what function it | |
c5aa993b JM |
175 | will need to call after a whole line is read. This also displays |
176 | the first prompt. */ | |
9e0b60a8 | 177 | length = strlen (PREFIX (0)) + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1; |
0f71a2f6 JM |
178 | a_prompt = (char *) xmalloc (length); |
179 | strcpy (a_prompt, PREFIX (0)); | |
9e0b60a8 | 180 | strcat (a_prompt, gdb_prompt); |
0f71a2f6 JM |
181 | strcat (a_prompt, SUFFIX (0)); |
182 | rl_callback_handler_install (a_prompt, input_handler); | |
183 | } | |
184 | else | |
185 | display_gdb_prompt (0); | |
b5a0ac70 | 186 | |
085dd6e6 JM |
187 | /* Now it's time to start the event loop. */ |
188 | start_event_loop (); | |
b5a0ac70 SS |
189 | } |
190 | ||
191 | /* Change the function to be invoked every time there is a character | |
192 | ready on stdin. This is used when the user sets the editing off, | |
193 | therefore bypassing readline, and letting gdb handle the input | |
194 | itself, via gdb_readline2. Also it is used in the opposite case in | |
195 | which the user sets editing on again, by restoring readline | |
196 | handling of the input. */ | |
392a587b | 197 | static void |
b5a0ac70 SS |
198 | change_line_handler () |
199 | { | |
200 | if (async_command_editing_p) | |
201 | { | |
202 | /* Turn on editing by using readline. */ | |
203 | call_readline = rl_callback_read_char; | |
0f71a2f6 | 204 | input_handler = command_line_handler; |
b5a0ac70 SS |
205 | } |
206 | else | |
207 | { | |
208 | /* Turn off editing by using gdb_readline2. */ | |
209 | rl_callback_handler_remove (); | |
210 | call_readline = gdb_readline2; | |
0f71a2f6 JM |
211 | |
212 | /* Set up the command handler as well, in case we are called as | |
c5aa993b | 213 | first thing from .gdbinit. */ |
0f71a2f6 | 214 | input_handler = command_line_handler; |
b5a0ac70 SS |
215 | } |
216 | ||
217 | /* To tell the event loop to change the handler associated with the | |
218 | input file descriptor, we need to create a new event source, | |
219 | corresponding to the same fd, but with a new event handler | |
220 | function. */ | |
085dd6e6 JM |
221 | /* NOTE: this operates on input_fd, not instream. If we are reading |
222 | commands from a file, instream will point to the file. However in | |
223 | async mode, we always read commands from a file with editing | |
224 | off. This means that the 'set editing on/off' will have effect | |
225 | only on the interactive session. */ | |
b5a0ac70 | 226 | delete_file_handler (input_fd); |
085dd6e6 | 227 | add_file_handler (input_fd, (file_handler_func *) call_readline, 0); |
b5a0ac70 SS |
228 | } |
229 | ||
230 | /* Displays the prompt. The prompt that is displayed is the current | |
231 | top of the prompt stack, if the argument NEW_PROMPT is | |
232 | 0. Otherwise, it displays whatever NEW_PROMPT is. This is used | |
233 | after each gdb command has completed, and in the following cases: | |
0f71a2f6 JM |
234 | 1. when the user enters a command line which is ended by '\' |
235 | indicating that the command will continue on the next line. | |
b5a0ac70 | 236 | In that case the prompt that is displayed is the empty string. |
0f71a2f6 JM |
237 | 2. When the user is entering 'commands' for a breakpoint, or |
238 | actions for a tracepoint. In this case the prompt will be '>' | |
239 | 3. Other???? | |
b5a0ac70 SS |
240 | FIXME: 2. & 3. not implemented yet for async. */ |
241 | void | |
242 | display_gdb_prompt (new_prompt) | |
243 | char *new_prompt; | |
244 | { | |
245 | int prompt_length = 0; | |
c5aa993b | 246 | char *gdb_prompt = get_prompt (); |
b5a0ac70 SS |
247 | |
248 | if (!new_prompt) | |
249 | { | |
250 | /* Just use the top of the prompt stack. */ | |
251 | prompt_length = strlen (PREFIX (0)) + | |
252 | strlen (SUFFIX (0)) + | |
9e0b60a8 | 253 | strlen (gdb_prompt) + 1; |
b5a0ac70 SS |
254 | |
255 | new_prompt = (char *) alloca (prompt_length); | |
256 | ||
257 | /* Prefix needs to have new line at end. */ | |
258 | strcpy (new_prompt, PREFIX (0)); | |
9e0b60a8 | 259 | strcat (new_prompt, gdb_prompt); |
b5a0ac70 SS |
260 | /* Suffix needs to have a new line at end and \032 \032 at |
261 | beginning. */ | |
262 | strcat (new_prompt, SUFFIX (0)); | |
263 | } | |
264 | ||
265 | if (async_command_editing_p) | |
266 | { | |
267 | rl_callback_handler_remove (); | |
268 | rl_callback_handler_install (new_prompt, input_handler); | |
269 | } | |
270 | else if (new_prompt) | |
271 | { | |
272 | /* Don't use a _filtered function here. It causes the assumed | |
273 | character position to be off, since the newline we read from | |
274 | the user is not accounted for. */ | |
275 | fputs_unfiltered (new_prompt, gdb_stdout); | |
276 | ||
277 | #ifdef MPW | |
278 | /* Move to a new line so the entered line doesn't have a prompt | |
279 | on the front of it. */ | |
280 | fputs_unfiltered ("\n", gdb_stdout); | |
281 | #endif /* MPW */ | |
282 | gdb_flush (gdb_stdout); | |
283 | } | |
284 | } | |
285 | ||
286 | /* Used when the user requests a different annotation level, with | |
287 | 'set annotate'. It pushes a new prompt (with prefix and suffix) on top | |
288 | of the prompt stack, if the annotation level desired is 2, otherwise | |
289 | it pops the top of the prompt stack when we want the annotation level | |
290 | to be the normal ones (1 or 2). */ | |
392a587b | 291 | static void |
b5a0ac70 SS |
292 | change_annotation_level () |
293 | { | |
294 | char *prefix, *suffix; | |
295 | ||
296 | if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0)) | |
297 | { | |
298 | /* The prompt stack has not been initialized to "", we are | |
299 | using gdb w/o the --async switch */ | |
300 | warning ("Command has same effect as set annotate"); | |
301 | return; | |
302 | } | |
303 | ||
304 | if (annotation_level > 1) | |
305 | { | |
306 | if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), "")) | |
307 | { | |
308 | /* Push a new prompt if the previous annotation_level was not >1. */ | |
309 | prefix = (char *) alloca (strlen (async_annotation_suffix) + 10); | |
310 | strcpy (prefix, "\n\032\032pre-"); | |
311 | strcat (prefix, async_annotation_suffix); | |
312 | strcat (prefix, "\n"); | |
313 | ||
314 | suffix = (char *) alloca (strlen (async_annotation_suffix) + 6); | |
315 | strcpy (suffix, "\n\032\032"); | |
316 | strcat (suffix, async_annotation_suffix); | |
317 | strcat (suffix, "\n"); | |
318 | ||
319 | push_prompt (prefix, (char *) 0, suffix); | |
320 | } | |
321 | } | |
322 | else | |
323 | { | |
324 | if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), "")) | |
325 | { | |
326 | /* Pop the top of the stack, we are going back to annotation < 1. */ | |
327 | pop_prompt (); | |
328 | } | |
329 | } | |
330 | } | |
331 | ||
332 | /* Pushes a new prompt on the prompt stack. Each prompt has three | |
333 | parts: prefix, prompt, suffix. Usually prefix and suffix are empty | |
334 | strings, except when the annotation level is 2. Memory is allocated | |
335 | within savestring for the new prompt. */ | |
43ff13b4 | 336 | void |
b5a0ac70 SS |
337 | push_prompt (prefix, prompt, suffix) |
338 | char *prefix; | |
339 | char *prompt; | |
340 | char *suffix; | |
341 | { | |
342 | the_prompts.top++; | |
343 | PREFIX (0) = savestring (prefix, strlen (prefix)); | |
344 | ||
43ff13b4 JM |
345 | /* Note that this function is used by the set annotate 2 |
346 | command. This is why we take care of saving the old prompt | |
347 | in case a new one is not specified. */ | |
b5a0ac70 SS |
348 | if (prompt) |
349 | PROMPT (0) = savestring (prompt, strlen (prompt)); | |
350 | else | |
351 | PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1))); | |
352 | ||
353 | SUFFIX (0) = savestring (suffix, strlen (suffix)); | |
354 | } | |
355 | ||
356 | /* Pops the top of the prompt stack, and frees the memory allocated for it. */ | |
43ff13b4 | 357 | void |
b5a0ac70 SS |
358 | pop_prompt () |
359 | { | |
43ff13b4 JM |
360 | /* If we are not during a 'synchronous' execution command, in which |
361 | case, the top prompt would be empty. */ | |
362 | if (strcmp (PROMPT (0), "")) | |
363 | /* This is for the case in which the prompt is set while the | |
364 | annotation level is 2. The top prompt will be changed, but when | |
365 | we return to annotation level < 2, we want that new prompt to be | |
366 | in effect, until the user does another 'set prompt'. */ | |
367 | if (strcmp (PROMPT (0), PROMPT (-1))) | |
368 | { | |
369 | free (PROMPT (-1)); | |
370 | PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0))); | |
371 | } | |
b5a0ac70 SS |
372 | |
373 | free (PREFIX (0)); | |
374 | free (PROMPT (0)); | |
375 | free (SUFFIX (0)); | |
376 | the_prompts.top--; | |
377 | } | |
378 | \f | |
379 | /* Handles a gdb command. This function is called by | |
380 | command_line_handler, which has processed one or more input lines | |
381 | into COMMAND. */ | |
392a587b | 382 | /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop |
b5a0ac70 SS |
383 | function. The command_loop function will be obsolete when we |
384 | switch to use the event loop at every execution of gdb. */ | |
392a587b | 385 | static void |
b5a0ac70 SS |
386 | command_handler (command) |
387 | char *command; | |
388 | { | |
389 | struct cleanup *old_chain; | |
390 | int stdin_is_tty = ISATTY (stdin); | |
43ff13b4 JM |
391 | struct continuation_arg *arg1; |
392 | struct continuation_arg *arg2; | |
b5a0ac70 SS |
393 | long time_at_cmd_start; |
394 | #ifdef HAVE_SBRK | |
395 | long space_at_cmd_start = 0; | |
396 | #endif | |
397 | extern int display_time; | |
398 | extern int display_space; | |
399 | ||
400 | #if defined(TUI) | |
401 | extern int insert_mode; | |
402 | #endif | |
403 | ||
404 | quit_flag = 0; | |
405 | if (instream == stdin && stdin_is_tty) | |
406 | reinitialize_more_filter (); | |
407 | old_chain = make_cleanup ((make_cleanup_func) command_loop_marker, 0); | |
408 | ||
409 | #if defined(TUI) | |
410 | insert_mode = 0; | |
411 | #endif | |
412 | /* If readline returned a NULL command, it means that the | |
413 | connection with the terminal is gone. This happens at the | |
414 | end of a testsuite run, after Expect has hung up | |
415 | but GDB is still alive. In such a case, we just quit gdb | |
416 | killing the inferior program too. */ | |
417 | if (command == 0) | |
418 | quit_command ((char *) 0, stdin == instream); | |
419 | ||
420 | time_at_cmd_start = get_run_time (); | |
421 | ||
422 | if (display_space) | |
423 | { | |
424 | #ifdef HAVE_SBRK | |
425 | extern char **environ; | |
426 | char *lim = (char *) sbrk (0); | |
427 | ||
428 | space_at_cmd_start = (long) (lim - (char *) &environ); | |
429 | #endif | |
430 | } | |
431 | ||
432 | execute_command (command, instream == stdin); | |
c5aa993b | 433 | |
43ff13b4 JM |
434 | /* Set things up for this function to be compete later, once the |
435 | executin has completed, if we are doing an execution command, | |
436 | otherwise, just go ahead and finish. */ | |
437 | if (target_has_async && target_executing) | |
438 | { | |
c5aa993b | 439 | arg1 = |
43ff13b4 | 440 | (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg)); |
c5aa993b | 441 | arg2 = |
43ff13b4 JM |
442 | (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg)); |
443 | arg1->next = arg2; | |
444 | arg2->next = NULL; | |
445 | arg1->data = (PTR) time_at_cmd_start; | |
446 | arg2->data = (PTR) space_at_cmd_start; | |
447 | add_continuation (command_line_handler_continuation, arg1); | |
448 | } | |
b5a0ac70 | 449 | |
43ff13b4 JM |
450 | /* Do any commands attached to breakpoint we stopped at. Only if we |
451 | are always running synchronously. Or if we have just executed a | |
452 | command that doesn't start the target. */ | |
453 | if (!target_has_async || !target_executing) | |
454 | { | |
455 | bpstat_do_actions (&stop_bpstat); | |
456 | do_cleanups (old_chain); | |
c5aa993b | 457 | |
43ff13b4 JM |
458 | if (display_time) |
459 | { | |
460 | long cmd_time = get_run_time () - time_at_cmd_start; | |
461 | ||
462 | printf_unfiltered ("Command execution time: %ld.%06ld\n", | |
463 | cmd_time / 1000000, cmd_time % 1000000); | |
464 | } | |
465 | ||
466 | if (display_space) | |
467 | { | |
468 | #ifdef HAVE_SBRK | |
469 | extern char **environ; | |
470 | char *lim = (char *) sbrk (0); | |
471 | long space_now = lim - (char *) &environ; | |
472 | long space_diff = space_now - space_at_cmd_start; | |
473 | ||
474 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", | |
475 | space_now, | |
476 | (space_diff >= 0 ? '+' : '-'), | |
477 | space_diff); | |
478 | #endif | |
479 | } | |
480 | } | |
481 | } | |
482 | ||
483 | /* Do any commands attached to breakpoint we stopped at. Only if we | |
484 | are always running synchronously. Or if we have just executed a | |
485 | command that doesn't start the target. */ | |
486 | void | |
487 | command_line_handler_continuation (arg) | |
488 | struct continuation_arg *arg; | |
c5aa993b | 489 | { |
43ff13b4 JM |
490 | extern int display_time; |
491 | extern int display_space; | |
492 | ||
493 | long time_at_cmd_start = (long) arg->data; | |
494 | long space_at_cmd_start = (long) arg->next->data; | |
b5a0ac70 | 495 | |
43ff13b4 | 496 | bpstat_do_actions (&stop_bpstat); |
c5aa993b JM |
497 | /*do_cleanups (old_chain); *//*?????FIXME????? */ |
498 | ||
b5a0ac70 SS |
499 | if (display_time) |
500 | { | |
501 | long cmd_time = get_run_time () - time_at_cmd_start; | |
502 | ||
503 | printf_unfiltered ("Command execution time: %ld.%06ld\n", | |
504 | cmd_time / 1000000, cmd_time % 1000000); | |
505 | } | |
b5a0ac70 SS |
506 | if (display_space) |
507 | { | |
508 | #ifdef HAVE_SBRK | |
509 | extern char **environ; | |
510 | char *lim = (char *) sbrk (0); | |
511 | long space_now = lim - (char *) &environ; | |
512 | long space_diff = space_now - space_at_cmd_start; | |
513 | ||
514 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", | |
515 | space_now, | |
516 | (space_diff >= 0 ? '+' : '-'), | |
517 | space_diff); | |
518 | #endif | |
519 | } | |
520 | } | |
521 | ||
522 | /* Handle a complete line of input. This is called by the callback | |
523 | mechanism within the readline library. Deal with incomplete commands | |
524 | as well, by saving the partial input in a global buffer. */ | |
525 | ||
392a587b | 526 | /* NOTE: 1999-04-30 This is the asynchronous version of the |
b5a0ac70 SS |
527 | command_line_input function. command_line_input will become |
528 | obsolete once we use the event loop as the default mechanism in | |
529 | GDB. */ | |
530 | static void | |
531 | command_line_handler (rl) | |
532 | char *rl; | |
533 | { | |
534 | static char *linebuffer = 0; | |
535 | static unsigned linelength = 0; | |
536 | register char *p; | |
537 | char *p1; | |
538 | int change_prompt = 0; | |
539 | extern char *line; | |
540 | extern int linesize; | |
541 | char *nline; | |
542 | char got_eof = 0; | |
543 | ||
544 | ||
545 | int repeat = (instream == stdin); | |
546 | ||
547 | if (annotation_level > 1 && instream == stdin) | |
548 | { | |
549 | printf_unfiltered ("\n\032\032post-"); | |
550 | printf_unfiltered (async_annotation_suffix); | |
551 | printf_unfiltered ("\n"); | |
552 | } | |
553 | ||
554 | if (linebuffer == 0) | |
555 | { | |
556 | linelength = 80; | |
557 | linebuffer = (char *) xmalloc (linelength); | |
558 | } | |
559 | ||
560 | p = linebuffer; | |
561 | ||
562 | if (more_to_come) | |
563 | { | |
564 | strcpy (linebuffer, readline_input_state.linebuffer); | |
565 | p = readline_input_state.linebuffer_ptr; | |
566 | free (readline_input_state.linebuffer); | |
567 | more_to_come = 0; | |
568 | change_prompt = 1; | |
569 | } | |
570 | ||
571 | #ifdef STOP_SIGNAL | |
572 | if (job_control) | |
0f71a2f6 | 573 | signal (STOP_SIGNAL, handle_stop_sig); |
b5a0ac70 SS |
574 | #endif |
575 | ||
576 | /* Make sure that all output has been output. Some machines may let | |
577 | you get away with leaving out some of the gdb_flush, but not all. */ | |
578 | wrap_here (""); | |
579 | gdb_flush (gdb_stdout); | |
580 | gdb_flush (gdb_stderr); | |
581 | ||
582 | if (source_file_name != NULL) | |
583 | { | |
584 | ++source_line_number; | |
585 | sprintf (source_error, | |
586 | "%s%s:%d: Error in sourced command file:\n", | |
587 | source_pre_error, | |
588 | source_file_name, | |
589 | source_line_number); | |
590 | error_pre_print = source_error; | |
591 | } | |
592 | ||
593 | /* If we are in this case, then command_handler will call quit | |
594 | and exit from gdb. */ | |
595 | if (!rl || rl == (char *) EOF) | |
596 | { | |
597 | got_eof = 1; | |
598 | command_handler (0); | |
599 | } | |
600 | if (strlen (rl) + 1 + (p - linebuffer) > linelength) | |
601 | { | |
602 | linelength = strlen (rl) + 1 + (p - linebuffer); | |
603 | nline = (char *) xrealloc (linebuffer, linelength); | |
604 | p += nline - linebuffer; | |
605 | linebuffer = nline; | |
606 | } | |
607 | p1 = rl; | |
608 | /* Copy line. Don't copy null at end. (Leaves line alone | |
609 | if this was just a newline) */ | |
610 | while (*p1) | |
611 | *p++ = *p1++; | |
612 | ||
613 | free (rl); /* Allocated in readline. */ | |
614 | ||
615 | if (p == linebuffer || *(p - 1) == '\\') | |
616 | { | |
617 | /* We come here also if the line entered is empty (just a 'return') */ | |
618 | p--; /* Put on top of '\'. */ | |
619 | ||
620 | if (*p == '\\') | |
621 | { | |
622 | readline_input_state.linebuffer = savestring (linebuffer, | |
623 | strlen (linebuffer)); | |
624 | readline_input_state.linebuffer_ptr = p; | |
625 | ||
626 | /* We will not invoke a execute_command if there is more | |
627 | input expected to complete the command. So, we need to | |
628 | print an empty prompt here. */ | |
629 | display_gdb_prompt (""); | |
630 | more_to_come = 1; | |
631 | } | |
632 | } | |
633 | ||
634 | #ifdef STOP_SIGNAL | |
635 | if (job_control) | |
636 | signal (STOP_SIGNAL, SIG_DFL); | |
637 | #endif | |
638 | ||
639 | #define SERVER_COMMAND_LENGTH 7 | |
640 | server_command = | |
641 | (p - linebuffer > SERVER_COMMAND_LENGTH) | |
642 | && STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH); | |
643 | if (server_command) | |
644 | { | |
645 | /* Note that we don't set `line'. Between this and the check in | |
646 | dont_repeat, this insures that repeating will still do the | |
647 | right thing. */ | |
648 | *p = '\0'; | |
649 | command_handler (linebuffer + SERVER_COMMAND_LENGTH); | |
650 | display_gdb_prompt (0); | |
651 | return; | |
652 | } | |
653 | ||
654 | /* Do history expansion if that is wished. */ | |
655 | if (history_expansion_p && instream == stdin | |
656 | && ISATTY (instream)) | |
657 | { | |
658 | char *history_value; | |
659 | int expanded; | |
660 | ||
661 | *p = '\0'; /* Insert null now. */ | |
662 | expanded = history_expand (linebuffer, &history_value); | |
663 | if (expanded) | |
664 | { | |
665 | /* Print the changes. */ | |
666 | printf_unfiltered ("%s\n", history_value); | |
667 | ||
668 | /* If there was an error, call this function again. */ | |
669 | if (expanded < 0) | |
670 | { | |
671 | free (history_value); | |
672 | return; | |
673 | } | |
674 | if (strlen (history_value) > linelength) | |
675 | { | |
676 | linelength = strlen (history_value) + 1; | |
677 | linebuffer = (char *) xrealloc (linebuffer, linelength); | |
678 | } | |
679 | strcpy (linebuffer, history_value); | |
680 | p = linebuffer + strlen (linebuffer); | |
681 | free (history_value); | |
682 | } | |
683 | } | |
684 | ||
685 | /* If we just got an empty line, and that is supposed | |
686 | to repeat the previous command, return the value in the | |
687 | global buffer. */ | |
688 | if (repeat && p == linebuffer && *p != '\\') | |
689 | { | |
690 | command_handler (line); | |
691 | display_gdb_prompt (0); | |
692 | return; | |
693 | } | |
694 | ||
695 | for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++); | |
696 | if (repeat && !*p1) | |
697 | { | |
698 | command_handler (line); | |
699 | display_gdb_prompt (0); | |
700 | return; | |
701 | } | |
702 | ||
703 | *p = 0; | |
704 | ||
705 | /* Add line to history if appropriate. */ | |
706 | if (instream == stdin | |
707 | && ISATTY (stdin) && *linebuffer) | |
708 | add_history (linebuffer); | |
709 | ||
710 | /* Note: lines consisting solely of comments are added to the command | |
711 | history. This is useful when you type a command, and then | |
712 | realize you don't want to execute it quite yet. You can comment | |
713 | out the command and then later fetch it from the value history | |
714 | and remove the '#'. The kill ring is probably better, but some | |
715 | people are in the habit of commenting things out. */ | |
716 | if (*p1 == '#') | |
717 | *p1 = '\0'; /* Found a comment. */ | |
718 | ||
719 | /* Save into global buffer if appropriate. */ | |
720 | if (repeat) | |
721 | { | |
722 | if (linelength > linesize) | |
723 | { | |
724 | line = xrealloc (line, linelength); | |
725 | linesize = linelength; | |
726 | } | |
727 | strcpy (line, linebuffer); | |
728 | if (!more_to_come) | |
729 | { | |
730 | command_handler (line); | |
731 | display_gdb_prompt (0); | |
732 | } | |
733 | return; | |
734 | } | |
735 | ||
736 | command_handler (linebuffer); | |
737 | display_gdb_prompt (0); | |
738 | return; | |
739 | } | |
740 | ||
741 | /* Does reading of input from terminal w/o the editing features | |
742 | provided by the readline library. */ | |
743 | ||
392a587b | 744 | /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline |
b5a0ac70 SS |
745 | will become obsolete when the event loop is made the default |
746 | execution for gdb. */ | |
085dd6e6 | 747 | void |
b5a0ac70 SS |
748 | gdb_readline2 () |
749 | { | |
750 | int c; | |
751 | char *result; | |
752 | int input_index = 0; | |
753 | int result_size = 80; | |
754 | ||
755 | result = (char *) xmalloc (result_size); | |
756 | ||
757 | /* We still need the while loop here, even though it would seem | |
758 | obvious to invoke gdb_readline2 at every character entered. If | |
759 | not using the readline library, the terminal is in cooked mode, | |
760 | which sends the characters all at once. Poll will notice that the | |
761 | input fd has changed state only after enter is pressed. At this | |
762 | point we still need to fetch all the chars entered. */ | |
763 | ||
764 | while (1) | |
765 | { | |
766 | /* Read from stdin if we are executing a user defined command. | |
767 | This is the right thing for prompt_for_continue, at least. */ | |
768 | c = fgetc (instream ? instream : stdin); | |
769 | ||
770 | if (c == EOF) | |
771 | { | |
772 | if (input_index > 0) | |
773 | /* The last line does not end with a newline. Return it, and | |
774 | if we are called again fgetc will still return EOF and | |
775 | we'll return NULL then. */ | |
776 | break; | |
777 | free (result); | |
0f71a2f6 | 778 | (*input_handler) (0); |
b5a0ac70 SS |
779 | } |
780 | ||
781 | if (c == '\n') | |
782 | #ifndef CRLF_SOURCE_FILES | |
783 | break; | |
784 | #else | |
785 | { | |
786 | if (input_index > 0 && result[input_index - 1] == '\r') | |
787 | input_index--; | |
788 | break; | |
789 | } | |
790 | #endif | |
791 | ||
792 | result[input_index++] = c; | |
793 | while (input_index >= result_size) | |
794 | { | |
795 | result_size *= 2; | |
796 | result = (char *) xrealloc (result, result_size); | |
797 | } | |
798 | } | |
799 | ||
800 | result[input_index++] = '\0'; | |
0f71a2f6 | 801 | (*input_handler) (result); |
b5a0ac70 SS |
802 | } |
803 | \f | |
804 | ||
805 | /* Initialization of signal handlers and tokens. There is a function | |
806 | handle_sig* for each of the signals GDB cares about. Specifically: | |
807 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These | |
808 | functions are the actual signal handlers associated to the signals | |
809 | via calls to signal(). The only job for these functions is to | |
810 | enqueue the appropriate event/procedure with the event loop. Such | |
811 | procedures are the old signal handlers. The event loop will take | |
812 | care of invoking the queued procedures to perform the usual tasks | |
813 | associated with the reception of the signal. */ | |
392a587b | 814 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
b5a0ac70 SS |
815 | init_signals will become obsolete as we move to have to event loop |
816 | as the default for gdb. */ | |
817 | void | |
818 | async_init_signals () | |
c5aa993b | 819 | { |
b5a0ac70 SS |
820 | signal (SIGINT, handle_sigint); |
821 | sigint_token = | |
0f71a2f6 | 822 | create_async_signal_handler (async_request_quit, NULL); |
b5a0ac70 SS |
823 | |
824 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed | |
825 | to the inferior and breakpoints will be ignored. */ | |
826 | #ifdef SIGTRAP | |
827 | signal (SIGTRAP, SIG_DFL); | |
828 | #endif | |
829 | ||
830 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get | |
831 | passed to the inferior, which we don't want. It would be | |
832 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but | |
833 | on BSD4.3 systems using vfork, that can affect the | |
834 | GDB process as well as the inferior (the signal handling tables | |
835 | might be in memory, shared between the two). Since we establish | |
836 | a handler for SIGQUIT, when we call exec it will set the signal | |
837 | to SIG_DFL for us. */ | |
838 | signal (SIGQUIT, handle_sigquit); | |
839 | sigquit_token = | |
0f71a2f6 | 840 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
841 | #ifdef SIGHUP |
842 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) | |
843 | sighup_token = | |
0f71a2f6 | 844 | create_async_signal_handler (async_disconnect, NULL); |
b5a0ac70 SS |
845 | else |
846 | sighup_token = | |
0f71a2f6 | 847 | create_async_signal_handler (async_do_nothing, NULL); |
b5a0ac70 SS |
848 | #endif |
849 | signal (SIGFPE, handle_sigfpe); | |
850 | sigfpe_token = | |
0f71a2f6 | 851 | create_async_signal_handler (async_float_handler, NULL); |
b5a0ac70 SS |
852 | |
853 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
854 | signal (SIGWINCH, handle_sigwinch); | |
855 | sigwinch_token = | |
0f71a2f6 | 856 | create_async_signal_handler (SIGWINCH_HANDLER, NULL); |
b5a0ac70 | 857 | #endif |
0f71a2f6 JM |
858 | #ifdef STOP_SIGNAL |
859 | sigtstp_token = | |
860 | create_async_signal_handler (async_stop_sig, NULL); | |
861 | #endif | |
862 | ||
863 | } | |
864 | ||
c5aa993b | 865 | void |
0f71a2f6 JM |
866 | mark_async_signal_handler_wrapper (token) |
867 | void *token; | |
868 | { | |
869 | mark_async_signal_handler ((async_signal_handler *) token); | |
b5a0ac70 SS |
870 | } |
871 | ||
872 | /* Tell the event loop what to do if SIGINT is received. | |
873 | See event-signal.c. */ | |
c5aa993b | 874 | void |
b5a0ac70 SS |
875 | handle_sigint (sig) |
876 | int sig; | |
877 | { | |
878 | signal (sig, handle_sigint); | |
879 | ||
880 | /* If immediate_quit is set, we go ahead and process the SIGINT right | |
881 | away, even if we usually would defer this to the event loop. The | |
882 | assumption here is that it is safe to process ^C immediately if | |
883 | immediate_quit is set. If we didn't, SIGINT would be really | |
884 | processed only the next time through the event loop. To get to | |
885 | that point, though, the command that we want to interrupt needs to | |
886 | finish first, which is unacceptable. */ | |
887 | if (immediate_quit) | |
0f71a2f6 | 888 | async_request_quit (0); |
b5a0ac70 SS |
889 | else |
890 | /* If immediate quit is not set, we process SIGINT the next time | |
891 | through the loop, which is fine. */ | |
0f71a2f6 | 892 | mark_async_signal_handler_wrapper (sigint_token); |
b5a0ac70 SS |
893 | } |
894 | ||
895 | /* Do the quit. All the checks have been done by the caller. */ | |
c5aa993b | 896 | void |
0f71a2f6 JM |
897 | async_request_quit (arg) |
898 | gdb_client_data arg; | |
b5a0ac70 SS |
899 | { |
900 | quit_flag = 1; | |
901 | #ifdef REQUEST_QUIT | |
902 | REQUEST_QUIT; | |
903 | #else | |
904 | quit (); | |
905 | #endif | |
906 | } | |
907 | ||
908 | /* Tell the event loop what to do if SIGQUIT is received. | |
909 | See event-signal.c. */ | |
c5aa993b | 910 | static void |
b5a0ac70 SS |
911 | handle_sigquit (sig) |
912 | int sig; | |
913 | { | |
0f71a2f6 | 914 | mark_async_signal_handler_wrapper (sigquit_token); |
b5a0ac70 SS |
915 | signal (sig, handle_sigquit); |
916 | } | |
917 | ||
918 | /* Called by the event loop in response to a SIGQUIT. */ | |
c5aa993b | 919 | static void |
0f71a2f6 JM |
920 | async_do_nothing (arg) |
921 | gdb_client_data arg; | |
b5a0ac70 SS |
922 | { |
923 | /* Empty function body. */ | |
924 | } | |
925 | ||
926 | #ifdef SIGHUP | |
927 | /* Tell the event loop what to do if SIGHUP is received. | |
928 | See event-signal.c. */ | |
c5aa993b | 929 | static void |
b5a0ac70 SS |
930 | handle_sighup (sig) |
931 | int sig; | |
932 | { | |
0f71a2f6 | 933 | mark_async_signal_handler_wrapper (sighup_token); |
b5a0ac70 SS |
934 | signal (sig, handle_sighup); |
935 | } | |
936 | ||
0f71a2f6 | 937 | /* Called by the event loop to process a SIGHUP */ |
c5aa993b | 938 | static void |
0f71a2f6 JM |
939 | async_disconnect (arg) |
940 | gdb_client_data arg; | |
b5a0ac70 SS |
941 | { |
942 | catch_errors (quit_cover, NULL, | |
943 | "Could not kill the program being debugged", | |
944 | RETURN_MASK_ALL); | |
945 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ | |
946 | kill (getpid (), SIGHUP); | |
947 | } | |
948 | #endif | |
949 | ||
0f71a2f6 | 950 | #ifdef STOP_SIGNAL |
c5aa993b JM |
951 | void |
952 | handle_stop_sig (sig) | |
0f71a2f6 JM |
953 | int sig; |
954 | { | |
c5aa993b JM |
955 | mark_async_signal_handler_wrapper (sigtstp_token); |
956 | signal (sig, handle_stop_sig); | |
0f71a2f6 JM |
957 | } |
958 | ||
959 | static void | |
960 | async_stop_sig (arg) | |
961 | gdb_client_data arg; | |
962 | { | |
c5aa993b | 963 | char *prompt = get_prompt (); |
0f71a2f6 JM |
964 | #if STOP_SIGNAL == SIGTSTP |
965 | signal (SIGTSTP, SIG_DFL); | |
966 | sigsetmask (0); | |
967 | kill (getpid (), SIGTSTP); | |
968 | signal (SIGTSTP, handle_stop_sig); | |
969 | #else | |
970 | signal (STOP_SIGNAL, handle_stop_sig); | |
971 | #endif | |
972 | printf_unfiltered ("%s", prompt); | |
973 | gdb_flush (gdb_stdout); | |
974 | ||
975 | /* Forget about any previous command -- null line now will do nothing. */ | |
976 | dont_repeat (); | |
977 | } | |
978 | #endif /* STOP_SIGNAL */ | |
979 | ||
b5a0ac70 SS |
980 | /* Tell the event loop what to do if SIGFPE is received. |
981 | See event-signal.c. */ | |
c5aa993b | 982 | static void |
b5a0ac70 SS |
983 | handle_sigfpe (sig) |
984 | int sig; | |
985 | { | |
0f71a2f6 | 986 | mark_async_signal_handler_wrapper (sigfpe_token); |
b5a0ac70 SS |
987 | signal (sig, handle_sigfpe); |
988 | } | |
989 | ||
990 | /* Event loop will call this functin to process a SIGFPE. */ | |
c5aa993b | 991 | static void |
0f71a2f6 JM |
992 | async_float_handler (arg) |
993 | gdb_client_data arg; | |
b5a0ac70 SS |
994 | { |
995 | /* This message is based on ANSI C, section 4.7. Note that integer | |
996 | divide by zero causes this, so "float" is a misnomer. */ | |
997 | error ("Erroneous arithmetic operation."); | |
998 | } | |
999 | ||
1000 | /* Tell the event loop what to do if SIGWINCH is received. | |
1001 | See event-signal.c. */ | |
1002 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) | |
c5aa993b | 1003 | static void |
b5a0ac70 SS |
1004 | handle_sigwinch (sig) |
1005 | int sig; | |
1006 | { | |
0f71a2f6 | 1007 | mark_async_signal_handler_wrapper (sigwinch_token); |
b5a0ac70 SS |
1008 | signal (sig, handle_sigwinch); |
1009 | } | |
1010 | #endif | |
1011 | \f | |
1012 | ||
1013 | /* Called by do_setshow_command. */ | |
1014 | /* ARGSUSED */ | |
1015 | void | |
1016 | set_async_editing_command (args, from_tty, c) | |
1017 | char *args; | |
1018 | int from_tty; | |
1019 | struct cmd_list_element *c; | |
1020 | { | |
1021 | change_line_handler (); | |
1022 | } | |
1023 | ||
1024 | /* Called by do_setshow_command. */ | |
1025 | /* ARGSUSED */ | |
1026 | void | |
1027 | set_async_annotation_level (args, from_tty, c) | |
1028 | char *args; | |
1029 | int from_tty; | |
1030 | struct cmd_list_element *c; | |
1031 | { | |
1032 | change_annotation_level (); | |
1033 | } | |
1034 | ||
1035 | /* Called by do_setshow_command. */ | |
1036 | /* ARGSUSED */ | |
1037 | void | |
1038 | set_async_prompt (args, from_tty, c) | |
1039 | char *args; | |
1040 | int from_tty; | |
1041 | struct cmd_list_element *c; | |
1042 | { | |
1043 | PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt)); | |
1044 | } | |
1045 | ||
0f71a2f6 JM |
1046 | /* Set things up for readline to be invoked via the alternate |
1047 | interface, i.e. via a callback function (rl_callback_read_char), | |
c5aa993b | 1048 | and hook up instream to the event loop. */ |
0f71a2f6 JM |
1049 | void |
1050 | _initialize_event_loop () | |
1051 | { | |
9e0b60a8 JM |
1052 | if (async_p) |
1053 | { | |
1054 | /* When a character is detected on instream by select or poll, | |
c5aa993b | 1055 | readline will be invoked via this callback function. */ |
9e0b60a8 JM |
1056 | call_readline = rl_callback_read_char; |
1057 | ||
1058 | /* When readline has read an end-of-line character, it passes | |
c5aa993b JM |
1059 | the complete line to gdb for processing. command_line_handler |
1060 | is the function that does this. */ | |
9e0b60a8 JM |
1061 | input_handler = command_line_handler; |
1062 | ||
1063 | /* Tell readline to use the same input stream that gdb uses. */ | |
1064 | rl_instream = instream; | |
1065 | ||
1066 | /* Get a file descriptor for the input stream, so that we can | |
085dd6e6 | 1067 | register it with the event loop. */ |
9e0b60a8 JM |
1068 | input_fd = fileno (instream); |
1069 | ||
085dd6e6 JM |
1070 | /* Tell gdb to use the cli_command_loop as the main loop. */ |
1071 | command_loop_hook = cli_command_loop; | |
1072 | ||
9e0b60a8 JM |
1073 | /* Now we need to create the event sources for the input file |
1074 | descriptor. */ | |
1075 | /* At this point in time, this is the only event source that we | |
c5aa993b JM |
1076 | register with the even loop. Another source is going to be |
1077 | the target program (inferior), but that must be registered | |
1078 | only when it actually exists (I.e. after we say 'run' or | |
1079 | after we connect to a remote target. */ | |
085dd6e6 | 1080 | add_file_handler (input_fd, (file_handler_func *) call_readline, 0); |
c5aa993b | 1081 | |
085dd6e6 | 1082 | /* Tell gdb that we will be using the readline library. This |
c5aa993b JM |
1083 | could be overwritten by a command in .gdbinit like 'set |
1084 | editing on' or 'off'. */ | |
085dd6e6 | 1085 | async_command_editing_p = 1; |
9e0b60a8 | 1086 | } |
0f71a2f6 | 1087 | } |