Commit | Line | Data |
---|---|---|
d318976c | 1 | /* GDB CLI command scripting. |
8926118c AC |
2 | |
3 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, | |
4 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software | |
5 | Foundation, Inc. | |
d318976c FN |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | #include "defs.h" | |
25 | #include "value.h" | |
26 | #include "language.h" /* For value_true */ | |
27 | #include <ctype.h> | |
28 | ||
d318976c | 29 | #include "ui-out.h" |
d318976c FN |
30 | |
31 | #include "top.h" | |
32 | #include "cli/cli-cmds.h" | |
33 | #include "cli/cli-decode.h" | |
34 | #include "cli/cli-script.h" | |
35 | ||
36 | /* From gdb/top.c */ | |
37 | ||
38 | extern void dont_repeat (void); | |
39 | ||
40 | extern void do_restore_instream_cleanup (void *stream); | |
41 | ||
42 | /* Prototypes for local functions */ | |
43 | ||
44 | static struct cleanup * | |
45 | make_cleanup_free_command_lines (struct command_line **arg); | |
46 | ||
47 | static enum command_control_type | |
48 | recurse_read_control_structure (struct command_line *current_cmd); | |
49 | ||
50 | static char *insert_args (char *line); | |
51 | ||
52 | static struct cleanup * setup_user_args (char *p); | |
53 | ||
54 | static void validate_comname (char *); | |
55 | ||
56 | /* Level of control structure. */ | |
57 | static int control_level; | |
58 | ||
59 | /* Source command state variable. */ | |
60 | static int source_error_allocated; | |
61 | ||
62 | /* Structure for arguments to user defined functions. */ | |
63 | #define MAXUSERARGS 10 | |
64 | struct user_args | |
65 | { | |
66 | struct user_args *next; | |
67 | struct | |
68 | { | |
69 | char *arg; | |
70 | int len; | |
71 | } | |
72 | a[MAXUSERARGS]; | |
73 | int count; | |
74 | } | |
75 | *user_args; | |
76 | ||
77 | \f | |
78 | /* Allocate, initialize a new command line structure for one of the | |
79 | control commands (if/while). */ | |
80 | ||
81 | static struct command_line * | |
82 | build_command_line (enum command_control_type type, char *args) | |
83 | { | |
84 | struct command_line *cmd; | |
85 | ||
86 | if (args == NULL) | |
87 | error ("if/while commands require arguments.\n"); | |
88 | ||
89 | cmd = (struct command_line *) xmalloc (sizeof (struct command_line)); | |
90 | cmd->next = NULL; | |
91 | cmd->control_type = type; | |
92 | ||
93 | cmd->body_count = 1; | |
94 | cmd->body_list | |
95 | = (struct command_line **) xmalloc (sizeof (struct command_line *) | |
96 | * cmd->body_count); | |
97 | memset (cmd->body_list, 0, sizeof (struct command_line *) * cmd->body_count); | |
98 | cmd->line = savestring (args, strlen (args)); | |
99 | return cmd; | |
100 | } | |
101 | ||
102 | /* Build and return a new command structure for the control commands | |
103 | such as "if" and "while". */ | |
104 | ||
105 | static struct command_line * | |
106 | get_command_line (enum command_control_type type, char *arg) | |
107 | { | |
108 | struct command_line *cmd; | |
109 | struct cleanup *old_chain = NULL; | |
110 | ||
111 | /* Allocate and build a new command line structure. */ | |
112 | cmd = build_command_line (type, arg); | |
113 | ||
114 | old_chain = make_cleanup_free_command_lines (&cmd); | |
115 | ||
116 | /* Read in the body of this command. */ | |
117 | if (recurse_read_control_structure (cmd) == invalid_control) | |
118 | { | |
119 | warning ("error reading in control structure\n"); | |
120 | do_cleanups (old_chain); | |
121 | return NULL; | |
122 | } | |
123 | ||
124 | discard_cleanups (old_chain); | |
125 | return cmd; | |
126 | } | |
127 | ||
128 | /* Recursively print a command (including full control structures). */ | |
8926118c | 129 | |
d318976c FN |
130 | void |
131 | print_command_lines (struct ui_out *uiout, struct command_line *cmd, | |
132 | unsigned int depth) | |
133 | { | |
134 | struct command_line *list; | |
135 | ||
136 | list = cmd; | |
137 | while (list) | |
138 | { | |
139 | ||
140 | if (depth) | |
141 | ui_out_spaces (uiout, 2 * depth); | |
142 | ||
143 | /* A simple command, print it and continue. */ | |
144 | if (list->control_type == simple_control) | |
145 | { | |
146 | ui_out_field_string (uiout, NULL, list->line); | |
147 | ui_out_text (uiout, "\n"); | |
148 | list = list->next; | |
149 | continue; | |
150 | } | |
151 | ||
152 | /* loop_continue to jump to the start of a while loop, print it | |
153 | and continue. */ | |
154 | if (list->control_type == continue_control) | |
155 | { | |
156 | ui_out_field_string (uiout, NULL, "loop_continue"); | |
157 | ui_out_text (uiout, "\n"); | |
158 | list = list->next; | |
159 | continue; | |
160 | } | |
161 | ||
162 | /* loop_break to break out of a while loop, print it and continue. */ | |
163 | if (list->control_type == break_control) | |
164 | { | |
165 | ui_out_field_string (uiout, NULL, "loop_break"); | |
166 | ui_out_text (uiout, "\n"); | |
167 | list = list->next; | |
168 | continue; | |
169 | } | |
170 | ||
171 | /* A while command. Recursively print its subcommands and continue. */ | |
172 | if (list->control_type == while_control) | |
173 | { | |
d318976c FN |
174 | ui_out_field_fmt (uiout, NULL, "while %s", list->line); |
175 | ui_out_text (uiout, "\n"); | |
176 | print_command_lines (uiout, *list->body_list, depth + 1); | |
d318976c FN |
177 | if (depth) |
178 | ui_out_spaces (uiout, 2 * depth); | |
e6ccd35f JSC |
179 | ui_out_field_string (uiout, NULL, "end"); |
180 | ui_out_text (uiout, "\n"); | |
d318976c FN |
181 | list = list->next; |
182 | continue; | |
183 | } | |
184 | ||
185 | /* An if command. Recursively print both arms before continueing. */ | |
186 | if (list->control_type == if_control) | |
187 | { | |
d318976c FN |
188 | ui_out_field_fmt (uiout, NULL, "if %s", list->line); |
189 | ui_out_text (uiout, "\n"); | |
190 | /* The true arm. */ | |
191 | print_command_lines (uiout, list->body_list[0], depth + 1); | |
192 | ||
193 | /* Show the false arm if it exists. */ | |
194 | if (list->body_count == 2) | |
195 | { | |
196 | if (depth) | |
197 | ui_out_spaces (uiout, 2 * depth); | |
198 | ui_out_field_string (uiout, NULL, "else"); | |
e6ccd35f | 199 | ui_out_text (uiout, "\n"); |
d318976c FN |
200 | print_command_lines (uiout, list->body_list[1], depth + 1); |
201 | } | |
202 | ||
d318976c FN |
203 | if (depth) |
204 | ui_out_spaces (uiout, 2 * depth); | |
e6ccd35f JSC |
205 | ui_out_field_string (uiout, NULL, "end"); |
206 | ui_out_text (uiout, "\n"); | |
d318976c FN |
207 | list = list->next; |
208 | continue; | |
209 | } | |
210 | ||
211 | /* ignore illegal command type and try next */ | |
212 | list = list->next; | |
213 | } /* while (list) */ | |
214 | } | |
d318976c | 215 | |
5913bcb0 AC |
216 | /* Handle pre-post hooks. */ |
217 | ||
218 | void | |
219 | clear_hook_in_cleanup (void *data) | |
220 | { | |
221 | struct cmd_list_element *c = data; | |
222 | c->hook_in = 0; /* Allow hook to work again once it is complete */ | |
223 | } | |
224 | ||
225 | void | |
226 | execute_cmd_pre_hook (struct cmd_list_element *c) | |
227 | { | |
228 | if ((c->hook_pre) && (!c->hook_in)) | |
229 | { | |
230 | struct cleanup *cleanups = make_cleanup (clear_hook_in_cleanup, c); | |
231 | c->hook_in = 1; /* Prevent recursive hooking */ | |
232 | execute_user_command (c->hook_pre, (char *) 0); | |
233 | do_cleanups (cleanups); | |
234 | } | |
235 | } | |
236 | ||
237 | void | |
238 | execute_cmd_post_hook (struct cmd_list_element *c) | |
239 | { | |
240 | if ((c->hook_post) && (!c->hook_in)) | |
241 | { | |
242 | struct cleanup *cleanups = make_cleanup (clear_hook_in_cleanup, c); | |
243 | c->hook_in = 1; /* Prevent recursive hooking */ | |
244 | execute_user_command (c->hook_post, (char *) 0); | |
245 | do_cleanups (cleanups); | |
246 | } | |
247 | } | |
248 | ||
d318976c FN |
249 | /* Execute the command in CMD. */ |
250 | ||
251 | void | |
252 | execute_user_command (struct cmd_list_element *c, char *args) | |
253 | { | |
254 | register struct command_line *cmdlines; | |
255 | struct cleanup *old_chain; | |
256 | enum command_control_type ret; | |
257 | ||
258 | old_chain = setup_user_args (args); | |
259 | ||
260 | cmdlines = c->user_commands; | |
261 | if (cmdlines == 0) | |
262 | /* Null command */ | |
263 | return; | |
264 | ||
265 | /* Set the instream to 0, indicating execution of a | |
266 | user-defined function. */ | |
267 | old_chain = make_cleanup (do_restore_instream_cleanup, instream); | |
268 | instream = (FILE *) 0; | |
269 | while (cmdlines) | |
270 | { | |
271 | ret = execute_control_command (cmdlines); | |
272 | if (ret != simple_control && ret != break_control) | |
273 | { | |
274 | warning ("Error in control structure.\n"); | |
275 | break; | |
276 | } | |
277 | cmdlines = cmdlines->next; | |
278 | } | |
279 | do_cleanups (old_chain); | |
280 | } | |
281 | ||
282 | enum command_control_type | |
283 | execute_control_command (struct command_line *cmd) | |
284 | { | |
285 | struct expression *expr; | |
286 | struct command_line *current; | |
287 | struct cleanup *old_chain = 0; | |
f976f6d4 AC |
288 | struct value *val; |
289 | struct value *val_mark; | |
d318976c FN |
290 | int loop; |
291 | enum command_control_type ret; | |
292 | char *new_line; | |
293 | ||
294 | switch (cmd->control_type) | |
295 | { | |
296 | case simple_control: | |
297 | /* A simple command, execute it and return. */ | |
298 | new_line = insert_args (cmd->line); | |
299 | if (!new_line) | |
300 | return invalid_control; | |
301 | old_chain = make_cleanup (free_current_contents, &new_line); | |
302 | execute_command (new_line, 0); | |
303 | ret = cmd->control_type; | |
304 | break; | |
305 | ||
306 | case continue_control: | |
307 | case break_control: | |
308 | /* Return for "continue", and "break" so we can either | |
309 | continue the loop at the top, or break out. */ | |
310 | ret = cmd->control_type; | |
311 | break; | |
312 | ||
313 | case while_control: | |
314 | { | |
315 | /* Parse the loop control expression for the while statement. */ | |
316 | new_line = insert_args (cmd->line); | |
317 | if (!new_line) | |
318 | return invalid_control; | |
319 | old_chain = make_cleanup (free_current_contents, &new_line); | |
320 | expr = parse_expression (new_line); | |
321 | make_cleanup (free_current_contents, &expr); | |
322 | ||
323 | ret = simple_control; | |
324 | loop = 1; | |
325 | ||
326 | /* Keep iterating so long as the expression is true. */ | |
327 | while (loop == 1) | |
328 | { | |
329 | int cond_result; | |
330 | ||
331 | QUIT; | |
332 | ||
333 | /* Evaluate the expression. */ | |
334 | val_mark = value_mark (); | |
335 | val = evaluate_expression (expr); | |
336 | cond_result = value_true (val); | |
337 | value_free_to_mark (val_mark); | |
338 | ||
339 | /* If the value is false, then break out of the loop. */ | |
340 | if (!cond_result) | |
341 | break; | |
342 | ||
343 | /* Execute the body of the while statement. */ | |
344 | current = *cmd->body_list; | |
345 | while (current) | |
346 | { | |
347 | ret = execute_control_command (current); | |
348 | ||
349 | /* If we got an error, or a "break" command, then stop | |
350 | looping. */ | |
351 | if (ret == invalid_control || ret == break_control) | |
352 | { | |
353 | loop = 0; | |
354 | break; | |
355 | } | |
356 | ||
357 | /* If we got a "continue" command, then restart the loop | |
358 | at this point. */ | |
359 | if (ret == continue_control) | |
360 | break; | |
361 | ||
362 | /* Get the next statement. */ | |
363 | current = current->next; | |
364 | } | |
365 | } | |
366 | ||
367 | /* Reset RET so that we don't recurse the break all the way down. */ | |
368 | if (ret == break_control) | |
369 | ret = simple_control; | |
370 | ||
371 | break; | |
372 | } | |
373 | ||
374 | case if_control: | |
375 | { | |
376 | new_line = insert_args (cmd->line); | |
377 | if (!new_line) | |
378 | return invalid_control; | |
379 | old_chain = make_cleanup (free_current_contents, &new_line); | |
380 | /* Parse the conditional for the if statement. */ | |
381 | expr = parse_expression (new_line); | |
382 | make_cleanup (free_current_contents, &expr); | |
383 | ||
384 | current = NULL; | |
385 | ret = simple_control; | |
386 | ||
387 | /* Evaluate the conditional. */ | |
388 | val_mark = value_mark (); | |
389 | val = evaluate_expression (expr); | |
390 | ||
391 | /* Choose which arm to take commands from based on the value of the | |
392 | conditional expression. */ | |
393 | if (value_true (val)) | |
394 | current = *cmd->body_list; | |
395 | else if (cmd->body_count == 2) | |
396 | current = *(cmd->body_list + 1); | |
397 | value_free_to_mark (val_mark); | |
398 | ||
399 | /* Execute commands in the given arm. */ | |
400 | while (current) | |
401 | { | |
402 | ret = execute_control_command (current); | |
403 | ||
404 | /* If we got an error, get out. */ | |
405 | if (ret != simple_control) | |
406 | break; | |
407 | ||
408 | /* Get the next statement in the body. */ | |
409 | current = current->next; | |
410 | } | |
411 | ||
412 | break; | |
413 | } | |
414 | ||
415 | default: | |
416 | warning ("Invalid control type in command structure."); | |
417 | return invalid_control; | |
418 | } | |
419 | ||
420 | if (old_chain) | |
421 | do_cleanups (old_chain); | |
422 | ||
423 | return ret; | |
424 | } | |
425 | ||
426 | /* "while" command support. Executes a body of statements while the | |
427 | loop condition is nonzero. */ | |
428 | ||
429 | void | |
430 | while_command (char *arg, int from_tty) | |
431 | { | |
432 | struct command_line *command = NULL; | |
433 | ||
434 | control_level = 1; | |
435 | command = get_command_line (while_control, arg); | |
436 | ||
437 | if (command == NULL) | |
438 | return; | |
439 | ||
440 | execute_control_command (command); | |
441 | free_command_lines (&command); | |
442 | } | |
443 | ||
444 | /* "if" command support. Execute either the true or false arm depending | |
445 | on the value of the if conditional. */ | |
446 | ||
447 | void | |
448 | if_command (char *arg, int from_tty) | |
449 | { | |
450 | struct command_line *command = NULL; | |
451 | ||
452 | control_level = 1; | |
453 | command = get_command_line (if_control, arg); | |
454 | ||
455 | if (command == NULL) | |
456 | return; | |
457 | ||
458 | execute_control_command (command); | |
459 | free_command_lines (&command); | |
460 | } | |
461 | ||
462 | /* Cleanup */ | |
463 | static void | |
464 | arg_cleanup (void *ignore) | |
465 | { | |
466 | struct user_args *oargs = user_args; | |
467 | if (!user_args) | |
8e65ff28 AC |
468 | internal_error (__FILE__, __LINE__, |
469 | "arg_cleanup called with no user args.\n"); | |
d318976c FN |
470 | |
471 | user_args = user_args->next; | |
b8c9b27d | 472 | xfree (oargs); |
d318976c FN |
473 | } |
474 | ||
475 | /* Bind the incomming arguments for a user defined command to | |
476 | $arg0, $arg1 ... $argMAXUSERARGS. */ | |
477 | ||
478 | static struct cleanup * | |
479 | setup_user_args (char *p) | |
480 | { | |
481 | struct user_args *args; | |
482 | struct cleanup *old_chain; | |
483 | unsigned int arg_count = 0; | |
484 | ||
485 | args = (struct user_args *) xmalloc (sizeof (struct user_args)); | |
486 | memset (args, 0, sizeof (struct user_args)); | |
487 | ||
488 | args->next = user_args; | |
489 | user_args = args; | |
490 | ||
491 | old_chain = make_cleanup (arg_cleanup, 0/*ignored*/); | |
492 | ||
493 | if (p == NULL) | |
494 | return old_chain; | |
495 | ||
496 | while (*p) | |
497 | { | |
498 | char *start_arg; | |
499 | int squote = 0; | |
500 | int dquote = 0; | |
501 | int bsquote = 0; | |
502 | ||
503 | if (arg_count >= MAXUSERARGS) | |
504 | { | |
505 | error ("user defined function may only have %d arguments.\n", | |
506 | MAXUSERARGS); | |
507 | return old_chain; | |
508 | } | |
509 | ||
510 | /* Strip whitespace. */ | |
511 | while (*p == ' ' || *p == '\t') | |
512 | p++; | |
513 | ||
514 | /* P now points to an argument. */ | |
515 | start_arg = p; | |
516 | user_args->a[arg_count].arg = p; | |
517 | ||
518 | /* Get to the end of this argument. */ | |
519 | while (*p) | |
520 | { | |
521 | if (((*p == ' ' || *p == '\t')) && !squote && !dquote && !bsquote) | |
522 | break; | |
523 | else | |
524 | { | |
525 | if (bsquote) | |
526 | bsquote = 0; | |
527 | else if (*p == '\\') | |
528 | bsquote = 1; | |
529 | else if (squote) | |
530 | { | |
531 | if (*p == '\'') | |
532 | squote = 0; | |
533 | } | |
534 | else if (dquote) | |
535 | { | |
536 | if (*p == '"') | |
537 | dquote = 0; | |
538 | } | |
539 | else | |
540 | { | |
541 | if (*p == '\'') | |
542 | squote = 1; | |
543 | else if (*p == '"') | |
544 | dquote = 1; | |
545 | } | |
546 | p++; | |
547 | } | |
548 | } | |
549 | ||
550 | user_args->a[arg_count].len = p - start_arg; | |
551 | arg_count++; | |
552 | user_args->count++; | |
553 | } | |
554 | return old_chain; | |
555 | } | |
556 | ||
557 | /* Given character string P, return a point to the first argument ($arg), | |
558 | or NULL if P contains no arguments. */ | |
559 | ||
560 | static char * | |
561 | locate_arg (char *p) | |
562 | { | |
563 | while ((p = strchr (p, '$'))) | |
564 | { | |
565 | if (strncmp (p, "$arg", 4) == 0 && isdigit (p[4])) | |
566 | return p; | |
567 | p++; | |
568 | } | |
569 | return NULL; | |
570 | } | |
571 | ||
572 | /* Insert the user defined arguments stored in user_arg into the $arg | |
573 | arguments found in line, with the updated copy being placed into nline. */ | |
574 | ||
575 | static char * | |
576 | insert_args (char *line) | |
577 | { | |
578 | char *p, *save_line, *new_line; | |
579 | unsigned len, i; | |
580 | ||
581 | /* First we need to know how much memory to allocate for the new line. */ | |
582 | save_line = line; | |
583 | len = 0; | |
584 | while ((p = locate_arg (line))) | |
585 | { | |
586 | len += p - line; | |
587 | i = p[4] - '0'; | |
588 | ||
589 | if (i >= user_args->count) | |
590 | { | |
591 | error ("Missing argument %d in user function.\n", i); | |
592 | return NULL; | |
593 | } | |
594 | len += user_args->a[i].len; | |
595 | line = p + 5; | |
596 | } | |
597 | ||
598 | /* Don't forget the tail. */ | |
599 | len += strlen (line); | |
600 | ||
601 | /* Allocate space for the new line and fill it in. */ | |
602 | new_line = (char *) xmalloc (len + 1); | |
603 | if (new_line == NULL) | |
604 | return NULL; | |
605 | ||
606 | /* Restore pointer to beginning of old line. */ | |
607 | line = save_line; | |
608 | ||
609 | /* Save pointer to beginning of new line. */ | |
610 | save_line = new_line; | |
611 | ||
612 | while ((p = locate_arg (line))) | |
613 | { | |
614 | int i, len; | |
615 | ||
616 | memcpy (new_line, line, p - line); | |
617 | new_line += p - line; | |
618 | i = p[4] - '0'; | |
619 | ||
620 | len = user_args->a[i].len; | |
621 | if (len) | |
622 | { | |
623 | memcpy (new_line, user_args->a[i].arg, len); | |
624 | new_line += len; | |
625 | } | |
626 | line = p + 5; | |
627 | } | |
628 | /* Don't forget the tail. */ | |
629 | strcpy (new_line, line); | |
630 | ||
631 | /* Return a pointer to the beginning of the new line. */ | |
632 | return save_line; | |
633 | } | |
634 | ||
635 | \f | |
636 | /* Expand the body_list of COMMAND so that it can hold NEW_LENGTH | |
637 | code bodies. This is typically used when we encounter an "else" | |
638 | clause for an "if" command. */ | |
639 | ||
640 | static void | |
641 | realloc_body_list (struct command_line *command, int new_length) | |
642 | { | |
643 | int n; | |
644 | struct command_line **body_list; | |
645 | ||
646 | n = command->body_count; | |
647 | ||
648 | /* Nothing to do? */ | |
649 | if (new_length <= n) | |
650 | return; | |
651 | ||
652 | body_list = (struct command_line **) | |
653 | xmalloc (sizeof (struct command_line *) * new_length); | |
654 | ||
655 | memcpy (body_list, command->body_list, sizeof (struct command_line *) * n); | |
656 | ||
b8c9b27d | 657 | xfree (command->body_list); |
d318976c FN |
658 | command->body_list = body_list; |
659 | command->body_count = new_length; | |
660 | } | |
661 | ||
662 | /* Read one line from the input stream. If the command is an "else" or | |
663 | "end", return such an indication to the caller. */ | |
664 | ||
665 | static enum misc_command_type | |
666 | read_next_line (struct command_line **command) | |
667 | { | |
668 | char *p, *p1, *prompt_ptr, control_prompt[256]; | |
669 | int i = 0; | |
670 | ||
671 | if (control_level >= 254) | |
672 | error ("Control nesting too deep!\n"); | |
673 | ||
674 | /* Set a prompt based on the nesting of the control commands. */ | |
675 | if (instream == stdin || (instream == 0 && readline_hook != NULL)) | |
676 | { | |
677 | for (i = 0; i < control_level; i++) | |
678 | control_prompt[i] = ' '; | |
679 | control_prompt[i] = '>'; | |
680 | control_prompt[i + 1] = '\0'; | |
681 | prompt_ptr = (char *) &control_prompt[0]; | |
682 | } | |
683 | else | |
684 | prompt_ptr = NULL; | |
685 | ||
686 | p = command_line_input (prompt_ptr, instream == stdin, "commands"); | |
687 | ||
688 | /* Not sure what to do here. */ | |
689 | if (p == NULL) | |
690 | return end_command; | |
691 | ||
692 | /* Strip leading and trailing whitespace. */ | |
693 | while (*p == ' ' || *p == '\t') | |
694 | p++; | |
695 | ||
696 | p1 = p + strlen (p); | |
697 | while (p1 != p && (p1[-1] == ' ' || p1[-1] == '\t')) | |
698 | p1--; | |
699 | ||
700 | /* Blanks and comments don't really do anything, but we need to | |
701 | distinguish them from else, end and other commands which can be | |
702 | executed. */ | |
703 | if (p1 == p || p[0] == '#') | |
704 | return nop_command; | |
705 | ||
706 | /* Is this the end of a simple, while, or if control structure? */ | |
707 | if (p1 - p == 3 && !strncmp (p, "end", 3)) | |
708 | return end_command; | |
709 | ||
710 | /* Is the else clause of an if control structure? */ | |
711 | if (p1 - p == 4 && !strncmp (p, "else", 4)) | |
712 | return else_command; | |
713 | ||
714 | /* Check for while, if, break, continue, etc and build a new command | |
715 | line structure for them. */ | |
716 | if (p1 - p > 5 && !strncmp (p, "while", 5)) | |
717 | *command = build_command_line (while_control, p + 6); | |
718 | else if (p1 - p > 2 && !strncmp (p, "if", 2)) | |
719 | *command = build_command_line (if_control, p + 3); | |
720 | else if (p1 - p == 10 && !strncmp (p, "loop_break", 10)) | |
721 | { | |
722 | *command = (struct command_line *) | |
723 | xmalloc (sizeof (struct command_line)); | |
724 | (*command)->next = NULL; | |
725 | (*command)->line = NULL; | |
726 | (*command)->control_type = break_control; | |
727 | (*command)->body_count = 0; | |
728 | (*command)->body_list = NULL; | |
729 | } | |
730 | else if (p1 - p == 13 && !strncmp (p, "loop_continue", 13)) | |
731 | { | |
732 | *command = (struct command_line *) | |
733 | xmalloc (sizeof (struct command_line)); | |
734 | (*command)->next = NULL; | |
735 | (*command)->line = NULL; | |
736 | (*command)->control_type = continue_control; | |
737 | (*command)->body_count = 0; | |
738 | (*command)->body_list = NULL; | |
739 | } | |
740 | else | |
741 | { | |
742 | /* A normal command. */ | |
743 | *command = (struct command_line *) | |
744 | xmalloc (sizeof (struct command_line)); | |
745 | (*command)->next = NULL; | |
746 | (*command)->line = savestring (p, p1 - p); | |
747 | (*command)->control_type = simple_control; | |
748 | (*command)->body_count = 0; | |
749 | (*command)->body_list = NULL; | |
750 | } | |
751 | ||
752 | /* Nothing special. */ | |
753 | return ok_command; | |
754 | } | |
755 | ||
756 | /* Recursively read in the control structures and create a command_line | |
757 | structure from them. | |
758 | ||
759 | The parent_control parameter is the control structure in which the | |
760 | following commands are nested. */ | |
761 | ||
762 | static enum command_control_type | |
763 | recurse_read_control_structure (struct command_line *current_cmd) | |
764 | { | |
765 | int current_body, i; | |
766 | enum misc_command_type val; | |
767 | enum command_control_type ret; | |
768 | struct command_line **body_ptr, *child_tail, *next; | |
769 | ||
770 | child_tail = NULL; | |
771 | current_body = 1; | |
772 | ||
773 | /* Sanity checks. */ | |
774 | if (current_cmd->control_type == simple_control) | |
775 | { | |
776 | error ("Recursed on a simple control type\n"); | |
777 | return invalid_control; | |
778 | } | |
779 | ||
780 | if (current_body > current_cmd->body_count) | |
781 | { | |
782 | error ("Allocated body is smaller than this command type needs\n"); | |
783 | return invalid_control; | |
784 | } | |
785 | ||
786 | /* Read lines from the input stream and build control structures. */ | |
787 | while (1) | |
788 | { | |
789 | dont_repeat (); | |
790 | ||
791 | next = NULL; | |
792 | val = read_next_line (&next); | |
793 | ||
794 | /* Just skip blanks and comments. */ | |
795 | if (val == nop_command) | |
796 | continue; | |
797 | ||
798 | if (val == end_command) | |
799 | { | |
800 | if (current_cmd->control_type == while_control | |
801 | || current_cmd->control_type == if_control) | |
802 | { | |
803 | /* Success reading an entire control structure. */ | |
804 | ret = simple_control; | |
805 | break; | |
806 | } | |
807 | else | |
808 | { | |
809 | ret = invalid_control; | |
810 | break; | |
811 | } | |
812 | } | |
813 | ||
814 | /* Not the end of a control structure. */ | |
815 | if (val == else_command) | |
816 | { | |
817 | if (current_cmd->control_type == if_control | |
818 | && current_body == 1) | |
819 | { | |
820 | realloc_body_list (current_cmd, 2); | |
821 | current_body = 2; | |
822 | child_tail = NULL; | |
823 | continue; | |
824 | } | |
825 | else | |
826 | { | |
827 | ret = invalid_control; | |
828 | break; | |
829 | } | |
830 | } | |
831 | ||
832 | if (child_tail) | |
833 | { | |
834 | child_tail->next = next; | |
835 | } | |
836 | else | |
837 | { | |
838 | body_ptr = current_cmd->body_list; | |
839 | for (i = 1; i < current_body; i++) | |
840 | body_ptr++; | |
841 | ||
842 | *body_ptr = next; | |
843 | ||
844 | } | |
845 | ||
846 | child_tail = next; | |
847 | ||
848 | /* If the latest line is another control structure, then recurse | |
849 | on it. */ | |
850 | if (next->control_type == while_control | |
851 | || next->control_type == if_control) | |
852 | { | |
853 | control_level++; | |
854 | ret = recurse_read_control_structure (next); | |
855 | control_level--; | |
856 | ||
857 | if (ret != simple_control) | |
858 | break; | |
859 | } | |
860 | } | |
861 | ||
862 | dont_repeat (); | |
863 | ||
864 | return ret; | |
865 | } | |
866 | ||
867 | /* Read lines from the input stream and accumulate them in a chain of | |
868 | struct command_line's, which is then returned. For input from a | |
869 | terminal, the special command "end" is used to mark the end of the | |
870 | input, and is not included in the returned chain of commands. */ | |
871 | ||
872 | #define END_MESSAGE "End with a line saying just \"end\"." | |
873 | ||
874 | struct command_line * | |
875 | read_command_lines (char *prompt_arg, int from_tty) | |
876 | { | |
877 | struct command_line *head, *tail, *next; | |
878 | struct cleanup *old_chain; | |
879 | enum command_control_type ret; | |
880 | enum misc_command_type val; | |
881 | ||
882 | control_level = 0; | |
883 | if (readline_begin_hook) | |
884 | { | |
885 | /* Note - intentional to merge messages with no newline */ | |
886 | (*readline_begin_hook) ("%s %s\n", prompt_arg, END_MESSAGE); | |
887 | } | |
888 | else if (from_tty && input_from_terminal_p ()) | |
889 | { | |
890 | printf_unfiltered ("%s\n%s\n", prompt_arg, END_MESSAGE); | |
891 | gdb_flush (gdb_stdout); | |
892 | } | |
893 | ||
894 | head = tail = NULL; | |
895 | old_chain = NULL; | |
896 | ||
897 | while (1) | |
898 | { | |
899 | val = read_next_line (&next); | |
900 | ||
901 | /* Ignore blank lines or comments. */ | |
902 | if (val == nop_command) | |
903 | continue; | |
904 | ||
905 | if (val == end_command) | |
906 | { | |
907 | ret = simple_control; | |
908 | break; | |
909 | } | |
910 | ||
911 | if (val != ok_command) | |
912 | { | |
913 | ret = invalid_control; | |
914 | break; | |
915 | } | |
916 | ||
917 | if (next->control_type == while_control | |
918 | || next->control_type == if_control) | |
919 | { | |
920 | control_level++; | |
921 | ret = recurse_read_control_structure (next); | |
922 | control_level--; | |
923 | ||
924 | if (ret == invalid_control) | |
925 | break; | |
926 | } | |
927 | ||
928 | if (tail) | |
929 | { | |
930 | tail->next = next; | |
931 | } | |
932 | else | |
933 | { | |
934 | head = next; | |
935 | old_chain = make_cleanup_free_command_lines (&head); | |
936 | } | |
937 | tail = next; | |
938 | } | |
939 | ||
940 | dont_repeat (); | |
941 | ||
942 | if (head) | |
943 | { | |
944 | if (ret != invalid_control) | |
945 | { | |
946 | discard_cleanups (old_chain); | |
947 | } | |
948 | else | |
949 | do_cleanups (old_chain); | |
950 | } | |
951 | ||
952 | if (readline_end_hook) | |
953 | { | |
954 | (*readline_end_hook) (); | |
955 | } | |
956 | return (head); | |
957 | } | |
958 | ||
959 | /* Free a chain of struct command_line's. */ | |
960 | ||
961 | void | |
962 | free_command_lines (struct command_line **lptr) | |
963 | { | |
964 | register struct command_line *l = *lptr; | |
965 | register struct command_line *next; | |
966 | struct command_line **blist; | |
967 | int i; | |
968 | ||
969 | while (l) | |
970 | { | |
971 | if (l->body_count > 0) | |
972 | { | |
973 | blist = l->body_list; | |
974 | for (i = 0; i < l->body_count; i++, blist++) | |
975 | free_command_lines (blist); | |
976 | } | |
977 | next = l->next; | |
b8c9b27d KB |
978 | xfree (l->line); |
979 | xfree (l); | |
d318976c FN |
980 | l = next; |
981 | } | |
0d70f41b | 982 | *lptr = NULL; |
d318976c FN |
983 | } |
984 | ||
985 | static void | |
986 | do_free_command_lines_cleanup (void *arg) | |
987 | { | |
988 | free_command_lines (arg); | |
989 | } | |
990 | ||
991 | static struct cleanup * | |
992 | make_cleanup_free_command_lines (struct command_line **arg) | |
993 | { | |
994 | return make_cleanup (do_free_command_lines_cleanup, arg); | |
995 | } | |
996 | \f | |
997 | static void | |
998 | validate_comname (char *comname) | |
999 | { | |
1000 | register char *p; | |
1001 | ||
1002 | if (comname == 0) | |
1003 | error_no_arg ("name of command to define"); | |
1004 | ||
1005 | p = comname; | |
1006 | while (*p) | |
1007 | { | |
1008 | if (!isalnum (*p) && *p != '-' && *p != '_') | |
1009 | error ("Junk in argument list: \"%s\"", p); | |
1010 | p++; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | /* This is just a placeholder in the command data structures. */ | |
1015 | static void | |
1016 | user_defined_command (char *ignore, int from_tty) | |
1017 | { | |
1018 | } | |
1019 | ||
1020 | void | |
1021 | define_command (char *comname, int from_tty) | |
1022 | { | |
1023 | #define MAX_TMPBUF 128 | |
1024 | enum cmd_hook_type | |
1025 | { | |
1026 | CMD_NO_HOOK = 0, | |
1027 | CMD_PRE_HOOK, | |
1028 | CMD_POST_HOOK | |
1029 | }; | |
1030 | register struct command_line *cmds; | |
1031 | register struct cmd_list_element *c, *newc, *oldc, *hookc = 0; | |
1032 | char *tem = comname; | |
1033 | char *tem2; | |
1034 | char tmpbuf[MAX_TMPBUF]; | |
1035 | int hook_type = CMD_NO_HOOK; | |
1036 | int hook_name_size = 0; | |
1037 | ||
1038 | #define HOOK_STRING "hook-" | |
1039 | #define HOOK_LEN 5 | |
1040 | #define HOOK_POST_STRING "hookpost-" | |
1041 | #define HOOK_POST_LEN 9 | |
1042 | ||
1043 | validate_comname (comname); | |
1044 | ||
1045 | /* Look it up, and verify that we got an exact match. */ | |
1046 | c = lookup_cmd (&tem, cmdlist, "", -1, 1); | |
1047 | if (c && !STREQ (comname, c->name)) | |
1048 | c = 0; | |
1049 | ||
1050 | if (c) | |
1051 | { | |
1052 | if (c->class == class_user || c->class == class_alias) | |
1053 | tem = "Redefine command \"%s\"? "; | |
1054 | else | |
1055 | tem = "Really redefine built-in command \"%s\"? "; | |
1056 | if (!query (tem, c->name)) | |
1057 | error ("Command \"%s\" not redefined.", c->name); | |
1058 | } | |
1059 | ||
1060 | /* If this new command is a hook, then mark the command which it | |
1061 | is hooking. Note that we allow hooking `help' commands, so that | |
1062 | we can hook the `stop' pseudo-command. */ | |
1063 | ||
1064 | if (!strncmp (comname, HOOK_STRING, HOOK_LEN)) | |
1065 | { | |
1066 | hook_type = CMD_PRE_HOOK; | |
1067 | hook_name_size = HOOK_LEN; | |
1068 | } | |
1069 | else if (!strncmp (comname, HOOK_POST_STRING, HOOK_POST_LEN)) | |
1070 | { | |
1071 | hook_type = CMD_POST_HOOK; | |
1072 | hook_name_size = HOOK_POST_LEN; | |
1073 | } | |
1074 | ||
1075 | if (hook_type != CMD_NO_HOOK) | |
1076 | { | |
1077 | /* Look up cmd it hooks, and verify that we got an exact match. */ | |
1078 | tem = comname + hook_name_size; | |
1079 | hookc = lookup_cmd (&tem, cmdlist, "", -1, 0); | |
1080 | if (hookc && !STREQ (comname + hook_name_size, hookc->name)) | |
1081 | hookc = 0; | |
1082 | if (!hookc) | |
1083 | { | |
1084 | warning ("Your new `%s' command does not hook any existing command.", | |
1085 | comname); | |
1086 | if (!query ("Proceed? ")) | |
1087 | error ("Not confirmed."); | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | comname = savestring (comname, strlen (comname)); | |
1092 | ||
1093 | /* If the rest of the commands will be case insensitive, this one | |
1094 | should behave in the same manner. */ | |
1095 | for (tem = comname; *tem; tem++) | |
1096 | if (isupper (*tem)) | |
1097 | *tem = tolower (*tem); | |
1098 | ||
1099 | sprintf (tmpbuf, "Type commands for definition of \"%s\".", comname); | |
1100 | cmds = read_command_lines (tmpbuf, from_tty); | |
1101 | ||
1102 | if (c && c->class == class_user) | |
1103 | free_command_lines (&c->user_commands); | |
1104 | ||
1105 | newc = add_cmd (comname, class_user, user_defined_command, | |
1106 | (c && c->class == class_user) | |
1107 | ? c->doc : savestring ("User-defined.", 13), &cmdlist); | |
1108 | newc->user_commands = cmds; | |
1109 | ||
1110 | /* If this new command is a hook, then mark both commands as being | |
1111 | tied. */ | |
1112 | if (hookc) | |
1113 | { | |
1114 | switch (hook_type) | |
1115 | { | |
1116 | case CMD_PRE_HOOK: | |
1117 | hookc->hook_pre = newc; /* Target gets hooked. */ | |
1118 | newc->hookee_pre = hookc; /* We are marked as hooking target cmd. */ | |
1119 | break; | |
1120 | case CMD_POST_HOOK: | |
f48ff60a FN |
1121 | hookc->hook_post = newc; /* Target gets hooked. */ |
1122 | newc->hookee_post = hookc; /* We are marked as hooking target cmd. */ | |
d318976c FN |
1123 | break; |
1124 | default: | |
1125 | /* Should never come here as hookc would be 0. */ | |
8e65ff28 | 1126 | internal_error (__FILE__, __LINE__, "bad switch"); |
d318976c FN |
1127 | } |
1128 | } | |
1129 | } | |
1130 | ||
1131 | void | |
1132 | document_command (char *comname, int from_tty) | |
1133 | { | |
1134 | struct command_line *doclines; | |
1135 | register struct cmd_list_element *c; | |
1136 | char *tem = comname; | |
1137 | char tmpbuf[128]; | |
1138 | ||
1139 | validate_comname (comname); | |
1140 | ||
1141 | c = lookup_cmd (&tem, cmdlist, "", 0, 1); | |
1142 | ||
1143 | if (c->class != class_user) | |
1144 | error ("Command \"%s\" is built-in.", comname); | |
1145 | ||
1146 | sprintf (tmpbuf, "Type documentation for \"%s\".", comname); | |
1147 | doclines = read_command_lines (tmpbuf, from_tty); | |
1148 | ||
1149 | if (c->doc) | |
b8c9b27d | 1150 | xfree (c->doc); |
d318976c FN |
1151 | |
1152 | { | |
1153 | register struct command_line *cl1; | |
1154 | register int len = 0; | |
1155 | ||
1156 | for (cl1 = doclines; cl1; cl1 = cl1->next) | |
1157 | len += strlen (cl1->line) + 1; | |
1158 | ||
1159 | c->doc = (char *) xmalloc (len + 1); | |
1160 | *c->doc = 0; | |
1161 | ||
1162 | for (cl1 = doclines; cl1; cl1 = cl1->next) | |
1163 | { | |
1164 | strcat (c->doc, cl1->line); | |
1165 | if (cl1->next) | |
1166 | strcat (c->doc, "\n"); | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | free_command_lines (&doclines); | |
1171 | } | |
1172 | \f | |
1173 | struct source_cleanup_lines_args | |
1174 | { | |
1175 | int old_line; | |
1176 | char *old_file; | |
1177 | char *old_pre_error; | |
1178 | char *old_error_pre_print; | |
1179 | }; | |
1180 | ||
1181 | static void | |
1182 | source_cleanup_lines (PTR args) | |
1183 | { | |
1184 | struct source_cleanup_lines_args *p = | |
1185 | (struct source_cleanup_lines_args *) args; | |
1186 | source_line_number = p->old_line; | |
1187 | source_file_name = p->old_file; | |
1188 | source_pre_error = p->old_pre_error; | |
1189 | error_pre_print = p->old_error_pre_print; | |
1190 | } | |
1191 | ||
1192 | /* ARGSUSED */ | |
1193 | static void | |
1194 | do_fclose_cleanup (void *stream) | |
1195 | { | |
1196 | fclose (stream); | |
1197 | } | |
1198 | ||
1199 | /* Used to implement source_command */ | |
1200 | ||
1201 | void | |
1202 | script_from_file (FILE *stream, char *file) | |
1203 | { | |
1204 | struct cleanup *old_cleanups; | |
1205 | struct source_cleanup_lines_args old_lines; | |
1206 | int needed_length; | |
1207 | ||
1208 | if (stream == NULL) | |
1209 | { | |
8e65ff28 | 1210 | internal_error (__FILE__, __LINE__, "called with NULL file pointer!"); |
d318976c FN |
1211 | } |
1212 | ||
1213 | old_cleanups = make_cleanup (do_fclose_cleanup, stream); | |
1214 | ||
1215 | old_lines.old_line = source_line_number; | |
1216 | old_lines.old_file = source_file_name; | |
1217 | old_lines.old_pre_error = source_pre_error; | |
1218 | old_lines.old_error_pre_print = error_pre_print; | |
1219 | make_cleanup (source_cleanup_lines, &old_lines); | |
1220 | source_line_number = 0; | |
1221 | source_file_name = file; | |
1222 | source_pre_error = error_pre_print == NULL ? "" : error_pre_print; | |
1223 | source_pre_error = savestring (source_pre_error, strlen (source_pre_error)); | |
b8c9b27d | 1224 | make_cleanup (xfree, source_pre_error); |
d318976c FN |
1225 | /* This will get set every time we read a line. So it won't stay "" for |
1226 | long. */ | |
1227 | error_pre_print = ""; | |
1228 | ||
1229 | needed_length = strlen (source_file_name) + strlen (source_pre_error) + 80; | |
1230 | if (source_error_allocated < needed_length) | |
1231 | { | |
1232 | source_error_allocated *= 2; | |
1233 | if (source_error_allocated < needed_length) | |
1234 | source_error_allocated = needed_length; | |
1235 | if (source_error == NULL) | |
1236 | source_error = xmalloc (source_error_allocated); | |
1237 | else | |
1238 | source_error = xrealloc (source_error, source_error_allocated); | |
1239 | } | |
1240 | ||
1241 | read_command_file (stream); | |
1242 | ||
1243 | do_cleanups (old_cleanups); | |
1244 | } | |
1245 | ||
1246 | void | |
1247 | show_user_1 (struct cmd_list_element *c, struct ui_file *stream) | |
1248 | { | |
1249 | register struct command_line *cmdlines; | |
1250 | ||
1251 | cmdlines = c->user_commands; | |
1252 | if (!cmdlines) | |
1253 | return; | |
1254 | fputs_filtered ("User command ", stream); | |
1255 | fputs_filtered (c->name, stream); | |
1256 | fputs_filtered (":\n", stream); | |
1257 | ||
d318976c FN |
1258 | print_command_lines (uiout, cmdlines, 1); |
1259 | fputs_filtered ("\n", stream); | |
d318976c FN |
1260 | } |
1261 |