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a1baa5f1 | 1 | /* Command line option handling. |
06907f25 | 2 | Copyright (C) 2006, 2007, 2008, 2010 Free Software Foundation, Inc. |
a1baa5f1 | 3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8c4c00c1 | 8 | Software Foundation; either version 3, or (at your option) any later |
a1baa5f1 | 9 | version. |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
a1baa5f1 | 19 | |
20 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "intl.h" | |
23 | #include "coretypes.h" | |
24 | #include "opts.h" | |
06907f25 | 25 | #include "options.h" |
b78351e5 | 26 | #include "diagnostic.h" |
a1baa5f1 | 27 | |
28 | /* Perform a binary search to find which option the command-line INPUT | |
615ef0bb | 29 | matches. Returns its index in the option array, and |
30 | OPT_SPECIAL_unknown on failure. | |
a1baa5f1 | 31 | |
32 | This routine is quite subtle. A normal binary search is not good | |
33 | enough because some options can be suffixed with an argument, and | |
34 | multiple sub-matches can occur, e.g. input of "-pedantic" matching | |
35 | the initial substring of "-pedantic-errors". | |
36 | ||
37 | A more complicated example is -gstabs. It should match "-g" with | |
38 | an argument of "stabs". Suppose, however, that the number and list | |
39 | of switches are such that the binary search tests "-gen-decls" | |
40 | before having tested "-g". This doesn't match, and as "-gen-decls" | |
41 | is less than "-gstabs", it will become the lower bound of the | |
42 | binary search range, and "-g" will never be seen. To resolve this | |
30b0f428 | 43 | issue, 'optc-gen.awk' makes "-gen-decls" point, via the back_chain member, |
a1baa5f1 | 44 | to "-g" so that failed searches that end between "-gen-decls" and |
45 | the lexicographically subsequent switch know to go back and see if | |
46 | "-g" causes a match (which it does in this example). | |
47 | ||
48 | This search is done in such a way that the longest match for the | |
49 | front end in question wins. If there is no match for the current | |
50 | front end, the longest match for a different front end is returned | |
51 | (or N_OPTS if none) and the caller emits an error message. */ | |
52 | size_t | |
53 | find_opt (const char *input, int lang_mask) | |
54 | { | |
55 | size_t mn, mx, md, opt_len; | |
56 | size_t match_wrong_lang; | |
57 | int comp; | |
58 | ||
59 | mn = 0; | |
60 | mx = cl_options_count; | |
61 | ||
62 | /* Find mn such this lexicographical inequality holds: | |
63 | cl_options[mn] <= input < cl_options[mn + 1]. */ | |
64 | while (mx - mn > 1) | |
65 | { | |
66 | md = (mn + mx) / 2; | |
67 | opt_len = cl_options[md].opt_len; | |
68 | comp = strncmp (input, cl_options[md].opt_text + 1, opt_len); | |
69 | ||
70 | if (comp < 0) | |
71 | mx = md; | |
72 | else | |
73 | mn = md; | |
74 | } | |
75 | ||
76 | /* This is the switch that is the best match but for a different | |
615ef0bb | 77 | front end, or OPT_SPECIAL_unknown if there is no match at all. */ |
78 | match_wrong_lang = OPT_SPECIAL_unknown; | |
a1baa5f1 | 79 | |
80 | /* Backtrace the chain of possible matches, returning the longest | |
81 | one, if any, that fits best. With current GCC switches, this | |
82 | loop executes at most twice. */ | |
83 | do | |
84 | { | |
85 | const struct cl_option *opt = &cl_options[mn]; | |
86 | ||
87 | /* Is the input either an exact match or a prefix that takes a | |
88 | joined argument? */ | |
89 | if (!strncmp (input, opt->opt_text + 1, opt->opt_len) | |
90 | && (input[opt->opt_len] == '\0' || (opt->flags & CL_JOINED))) | |
91 | { | |
92 | /* If language is OK, return it. */ | |
93 | if (opt->flags & lang_mask) | |
94 | return mn; | |
95 | ||
96 | /* If we haven't remembered a prior match, remember this | |
97 | one. Any prior match is necessarily better. */ | |
615ef0bb | 98 | if (match_wrong_lang == OPT_SPECIAL_unknown) |
a1baa5f1 | 99 | match_wrong_lang = mn; |
100 | } | |
101 | ||
102 | /* Try the next possibility. This is cl_options_count if there | |
103 | are no more. */ | |
104 | mn = opt->back_chain; | |
105 | } | |
106 | while (mn != cl_options_count); | |
107 | ||
615ef0bb | 108 | /* Return the best wrong match, or OPT_SPECIAL_unknown if none. */ |
a1baa5f1 | 109 | return match_wrong_lang; |
110 | } | |
111 | ||
06907f25 | 112 | /* If ARG is a non-negative integer made up solely of digits, return its |
113 | value, otherwise return -1. */ | |
114 | ||
115 | int | |
116 | integral_argument (const char *arg) | |
117 | { | |
118 | const char *p = arg; | |
119 | ||
120 | while (*p && ISDIGIT (*p)) | |
121 | p++; | |
122 | ||
123 | if (*p == '\0') | |
124 | return atoi (arg); | |
125 | ||
126 | return -1; | |
127 | } | |
128 | ||
129 | /* Decode the switch beginning at ARGV for the language indicated by | |
130 | LANG_MASK, into the structure *DECODED. Returns the number of | |
131 | switches consumed. */ | |
132 | ||
615ef0bb | 133 | static unsigned int |
06907f25 | 134 | decode_cmdline_option (const char **argv, unsigned int lang_mask, |
135 | struct cl_decoded_option *decoded) | |
136 | { | |
137 | size_t opt_index; | |
138 | const char *opt, *arg = 0; | |
139 | char *dup = 0; | |
140 | int value = 1; | |
141 | unsigned int result = 1; | |
142 | const struct cl_option *option; | |
143 | int errors = 0; | |
144 | ||
145 | opt = argv[0]; | |
146 | ||
147 | opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET); | |
615ef0bb | 148 | if (opt_index == OPT_SPECIAL_unknown |
06907f25 | 149 | && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm') |
150 | && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-') | |
151 | { | |
152 | /* Drop the "no-" from negative switches. */ | |
153 | size_t len = strlen (opt) - 3; | |
154 | ||
155 | dup = XNEWVEC (char, len + 1); | |
156 | dup[0] = '-'; | |
157 | dup[1] = opt[1]; | |
158 | memcpy (dup + 2, opt + 5, len - 2 + 1); | |
159 | opt = dup; | |
160 | value = 0; | |
161 | opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET); | |
162 | } | |
163 | ||
615ef0bb | 164 | if (opt_index == OPT_SPECIAL_unknown) |
165 | { | |
166 | arg = argv[0]; | |
167 | goto done; | |
168 | } | |
06907f25 | 169 | |
170 | option = &cl_options[opt_index]; | |
171 | ||
172 | /* Reject negative form of switches that don't take negatives as | |
173 | unrecognized. */ | |
174 | if (!value && (option->flags & CL_REJECT_NEGATIVE)) | |
175 | { | |
615ef0bb | 176 | opt_index = OPT_SPECIAL_unknown; |
177 | arg = argv[0]; | |
06907f25 | 178 | goto done; |
179 | } | |
180 | ||
181 | /* Check to see if the option is disabled for this configuration. */ | |
182 | if (option->flags & CL_DISABLED) | |
183 | errors |= CL_ERR_DISABLED; | |
184 | ||
185 | /* Sort out any argument the switch takes. */ | |
186 | if (option->flags & CL_JOINED) | |
187 | { | |
188 | /* Have arg point to the original switch. This is because | |
189 | some code, such as disable_builtin_function, expects its | |
190 | argument to be persistent until the program exits. */ | |
191 | arg = argv[0] + cl_options[opt_index].opt_len + 1; | |
192 | if (!value) | |
193 | arg += strlen ("no-"); | |
194 | ||
195 | if (*arg == '\0' && !(option->flags & CL_MISSING_OK)) | |
196 | { | |
197 | if (option->flags & CL_SEPARATE) | |
198 | { | |
199 | arg = argv[1]; | |
200 | result = 2; | |
201 | if (arg == NULL) | |
202 | result = 1; | |
203 | } | |
204 | else | |
205 | /* Missing argument. */ | |
206 | arg = NULL; | |
207 | } | |
208 | } | |
209 | else if (option->flags & CL_SEPARATE) | |
210 | { | |
211 | arg = argv[1]; | |
212 | result = 2; | |
213 | if (arg == NULL) | |
214 | result = 1; | |
215 | } | |
216 | ||
217 | /* Check if this is a switch for a different front end. */ | |
218 | if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET))) | |
219 | errors |= CL_ERR_WRONG_LANG; | |
220 | else if ((option->flags & CL_TARGET) | |
221 | && (option->flags & CL_LANG_ALL) | |
222 | && !(option->flags & lang_mask)) | |
223 | /* Complain for target flag language mismatches if any languages | |
224 | are specified. */ | |
225 | errors |= CL_ERR_WRONG_LANG; | |
226 | ||
227 | if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE))) | |
228 | errors |= CL_ERR_MISSING_ARG; | |
229 | ||
230 | /* If the switch takes an integer, convert it. */ | |
231 | if (arg && (option->flags & CL_UINTEGER)) | |
232 | { | |
233 | value = integral_argument (arg); | |
234 | if (value == -1) | |
235 | errors |= CL_ERR_UINT_ARG; | |
236 | } | |
237 | ||
238 | done: | |
239 | if (dup) | |
240 | free (dup); | |
241 | decoded->opt_index = opt_index; | |
242 | decoded->arg = arg; | |
243 | decoded->value = value; | |
244 | decoded->errors = errors; | |
615ef0bb | 245 | switch (result) |
246 | { | |
247 | case 1: | |
248 | decoded->orig_option_with_args_text = argv[0]; | |
e88d34f6 | 249 | decoded->canonical_option[0] = argv[0]; |
250 | decoded->canonical_option[1] = NULL; | |
615ef0bb | 251 | break; |
252 | case 2: | |
253 | decoded->orig_option_with_args_text = concat (argv[0], " ", | |
254 | argv[1], NULL); | |
e88d34f6 | 255 | decoded->canonical_option[0] = argv[0]; |
256 | decoded->canonical_option[1] = argv[1]; | |
615ef0bb | 257 | break; |
258 | default: | |
259 | gcc_unreachable (); | |
260 | } | |
06907f25 | 261 | return result; |
262 | } | |
263 | ||
615ef0bb | 264 | /* Decode command-line options (ARGC and ARGV being the arguments of |
265 | main) into an array, setting *DECODED_OPTIONS to a pointer to that | |
266 | array and *DECODED_OPTIONS_COUNT to the number of entries in the | |
267 | array. The first entry in the array is always one for the program | |
268 | name (OPT_SPECIAL_program_name). LANG_MASK indicates the language | |
269 | applicable for decoding. Do not produce any diagnostics or set | |
270 | state outside of these variables. */ | |
271 | ||
272 | void | |
273 | decode_cmdline_options_to_array (unsigned int argc, const char **argv, | |
274 | unsigned int lang_mask, | |
275 | struct cl_decoded_option **decoded_options, | |
276 | unsigned int *decoded_options_count) | |
277 | { | |
278 | unsigned int n, i; | |
279 | struct cl_decoded_option *opt_array; | |
280 | unsigned int num_decoded_options; | |
281 | ||
282 | opt_array = XNEWVEC (struct cl_decoded_option, argc); | |
283 | ||
284 | opt_array[0].opt_index = OPT_SPECIAL_program_name; | |
285 | opt_array[0].arg = argv[0]; | |
286 | opt_array[0].orig_option_with_args_text = argv[0]; | |
e88d34f6 | 287 | opt_array[0].canonical_option[0] = argv[0]; |
288 | opt_array[0].canonical_option[1] = NULL; | |
615ef0bb | 289 | opt_array[0].value = 1; |
290 | opt_array[0].errors = 0; | |
291 | num_decoded_options = 1; | |
292 | ||
293 | for (i = 1; i < argc; i += n) | |
294 | { | |
295 | const char *opt = argv[i]; | |
296 | ||
297 | /* Interpret "-" or a non-switch as a file name. */ | |
298 | if (opt[0] != '-' || opt[1] == '\0') | |
299 | { | |
300 | opt_array[num_decoded_options].opt_index = OPT_SPECIAL_input_file; | |
301 | opt_array[num_decoded_options].arg = opt; | |
302 | opt_array[num_decoded_options].orig_option_with_args_text = opt; | |
e88d34f6 | 303 | opt_array[num_decoded_options].canonical_option[0] = opt; |
304 | opt_array[num_decoded_options].canonical_option[1] = NULL; | |
615ef0bb | 305 | opt_array[num_decoded_options].value = 1; |
306 | opt_array[num_decoded_options].errors = 0; | |
307 | num_decoded_options++; | |
308 | n = 1; | |
309 | continue; | |
310 | } | |
311 | ||
312 | n = decode_cmdline_option (argv + i, lang_mask, | |
313 | &opt_array[num_decoded_options]); | |
314 | num_decoded_options++; | |
315 | } | |
316 | ||
317 | opt_array = XRESIZEVEC (struct cl_decoded_option, opt_array, | |
318 | num_decoded_options); | |
319 | *decoded_options = opt_array; | |
320 | *decoded_options_count = num_decoded_options; | |
321 | } | |
322 | ||
a1baa5f1 | 323 | /* Return true if NEXT_OPT_IDX cancels OPT_IDX. Return false if the |
324 | next one is the same as ORIG_NEXT_OPT_IDX. */ | |
325 | ||
326 | static bool | |
327 | cancel_option (int opt_idx, int next_opt_idx, int orig_next_opt_idx) | |
328 | { | |
329 | /* An option can be canceled by the same option or an option with | |
330 | Negative. */ | |
331 | if (cl_options [next_opt_idx].neg_index == opt_idx) | |
332 | return true; | |
333 | ||
334 | if (cl_options [next_opt_idx].neg_index != orig_next_opt_idx) | |
335 | return cancel_option (opt_idx, cl_options [next_opt_idx].neg_index, | |
336 | orig_next_opt_idx); | |
48e1416a | 337 | |
a1baa5f1 | 338 | return false; |
339 | } | |
340 | ||
341 | /* Filter out options canceled by the ones after them. */ | |
342 | ||
343 | void | |
344 | prune_options (int *argcp, char ***argvp) | |
345 | { | |
346 | int argc = *argcp; | |
4077bf7a | 347 | int *options = XNEWVEC (int, argc); |
616c5314 | 348 | /* We will only return this replacement argv if we remove at least |
349 | one argument, so it does not need to be size (argc + 1) to | |
350 | make room for the terminating NULL because we will always have | |
351 | freed up at least one slot when we end up using it at all. */ | |
4077bf7a | 352 | char **argv = XNEWVEC (char *, argc); |
a1baa5f1 | 353 | int i, arg_count, need_prune = 0; |
354 | const struct cl_option *option; | |
355 | size_t opt_index; | |
356 | ||
357 | /* Scan all arguments. */ | |
358 | for (i = 1; i < argc; i++) | |
359 | { | |
360 | int value = 1; | |
361 | const char *opt = (*argvp) [i]; | |
362 | ||
363 | opt_index = find_opt (opt + 1, -1); | |
615ef0bb | 364 | if (opt_index == OPT_SPECIAL_unknown |
a1baa5f1 | 365 | && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm') |
366 | && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-') | |
367 | { | |
368 | char *dup; | |
369 | ||
370 | /* Drop the "no-" from negative switches. */ | |
371 | size_t len = strlen (opt) - 3; | |
372 | ||
373 | dup = XNEWVEC (char, len + 1); | |
374 | dup[0] = '-'; | |
375 | dup[1] = opt[1]; | |
376 | memcpy (dup + 2, opt + 5, len - 2 + 1); | |
377 | opt = dup; | |
378 | value = 0; | |
379 | opt_index = find_opt (opt + 1, -1); | |
380 | free (dup); | |
381 | } | |
382 | ||
615ef0bb | 383 | if (opt_index == OPT_SPECIAL_unknown) |
a1baa5f1 | 384 | { |
385 | cont: | |
386 | options [i] = 0; | |
387 | continue; | |
388 | } | |
389 | ||
390 | option = &cl_options[opt_index]; | |
391 | if (option->neg_index < 0) | |
392 | goto cont; | |
393 | ||
f8d1124d | 394 | /* Skip joined switches. */ |
395 | if ((option->flags & CL_JOINED)) | |
396 | goto cont; | |
397 | ||
a1baa5f1 | 398 | /* Reject negative form of switches that don't take negatives as |
399 | unrecognized. */ | |
400 | if (!value && (option->flags & CL_REJECT_NEGATIVE)) | |
401 | goto cont; | |
402 | ||
403 | options [i] = (int) opt_index; | |
404 | need_prune |= options [i]; | |
405 | } | |
406 | ||
407 | if (!need_prune) | |
408 | goto done; | |
409 | ||
410 | /* Remove arguments which are negated by others after them. */ | |
411 | argv [0] = (*argvp) [0]; | |
412 | arg_count = 1; | |
413 | for (i = 1; i < argc; i++) | |
414 | { | |
415 | int j, opt_idx; | |
416 | ||
417 | opt_idx = options [i]; | |
418 | if (opt_idx) | |
419 | { | |
420 | int next_opt_idx; | |
421 | for (j = i + 1; j < argc; j++) | |
422 | { | |
423 | next_opt_idx = options [j]; | |
424 | if (next_opt_idx | |
425 | && cancel_option (opt_idx, next_opt_idx, | |
426 | next_opt_idx)) | |
427 | break; | |
428 | } | |
429 | } | |
430 | else | |
431 | goto keep; | |
432 | ||
433 | if (j == argc) | |
434 | { | |
435 | keep: | |
436 | argv [arg_count] = (*argvp) [i]; | |
437 | arg_count++; | |
438 | } | |
439 | } | |
440 | ||
441 | if (arg_count != argc) | |
442 | { | |
443 | *argcp = arg_count; | |
444 | *argvp = argv; | |
616c5314 | 445 | /* Add NULL-termination. Guaranteed not to overflow because |
446 | arg_count here can only be less than argc. */ | |
447 | argv[arg_count] = 0; | |
a1baa5f1 | 448 | } |
449 | else | |
450 | { | |
451 | done: | |
452 | free (argv); | |
453 | } | |
454 | ||
455 | free (options); | |
456 | } | |
b78351e5 | 457 | |
458 | /* Handle option OPT_INDEX, and argument ARG, for the language | |
459 | indicated by LANG_MASK, using the handlers in HANDLERS. VALUE is | |
460 | the option value as for the value field of cl_decoded_option. KIND | |
461 | is the diagnostic_t if this is a diagnostics option, DK_UNSPECIFIED | |
462 | otherwise. Returns false if the switch was invalid. */ | |
463 | ||
464 | bool | |
465 | handle_option (size_t opt_index, const char *arg, int value, | |
466 | unsigned int lang_mask, int kind, | |
467 | const struct cl_option_handlers *handlers) | |
468 | { | |
469 | const struct cl_option *option = &cl_options[opt_index]; | |
470 | size_t i; | |
471 | ||
472 | if (option->flag_var) | |
473 | set_option (opt_index, value, arg, kind); | |
474 | ||
475 | for (i = 0; i < handlers->num_handlers; i++) | |
476 | if (option->flags & handlers->handlers[i].mask) | |
477 | { | |
478 | if (!handlers->handlers[i].handler (opt_index, arg, value, | |
479 | lang_mask, kind, handlers)) | |
480 | return false; | |
481 | else | |
482 | handlers->post_handling_callback (opt_index, arg, value, | |
483 | handlers->handlers[i].mask); | |
484 | } | |
485 | ||
486 | return true; | |
487 | } | |
488 | ||
489 | /* Handle the switch DECODED for the language indicated by LANG_MASK, | |
490 | using the handlers in *HANDLERS. */ | |
491 | ||
492 | void | |
493 | read_cmdline_option (struct cl_decoded_option *decoded, | |
494 | unsigned int lang_mask, | |
495 | const struct cl_option_handlers *handlers) | |
496 | { | |
497 | const struct cl_option *option; | |
498 | const char *opt; | |
499 | ||
500 | if (decoded->opt_index == OPT_SPECIAL_unknown) | |
501 | { | |
502 | opt = decoded->arg; | |
503 | ||
504 | if (handlers->unknown_option_callback (opt)) | |
505 | error ("unrecognized command line option %qs", opt); | |
506 | return; | |
507 | } | |
508 | ||
509 | option = &cl_options[decoded->opt_index]; | |
510 | opt = decoded->orig_option_with_args_text; | |
511 | ||
512 | if (decoded->errors & CL_ERR_DISABLED) | |
513 | { | |
514 | error ("command line option %qs" | |
515 | " is not supported by this configuration", opt); | |
516 | return; | |
517 | } | |
518 | ||
519 | if (decoded->errors & CL_ERR_WRONG_LANG) | |
520 | { | |
521 | handlers->wrong_lang_callback (opt, option, lang_mask); | |
522 | return; | |
523 | } | |
524 | ||
525 | if (decoded->errors & CL_ERR_MISSING_ARG) | |
526 | { | |
527 | if (option->missing_argument_error) | |
528 | error (option->missing_argument_error, opt); | |
529 | else | |
530 | error ("missing argument to %qs", opt); | |
531 | return; | |
532 | } | |
533 | ||
534 | if (decoded->errors & CL_ERR_UINT_ARG) | |
535 | { | |
536 | error ("argument to %qs should be a non-negative integer", | |
537 | option->opt_text); | |
538 | return; | |
539 | } | |
540 | ||
541 | gcc_assert (!decoded->errors); | |
542 | ||
543 | if (!handle_option (decoded->opt_index, decoded->arg, decoded->value, | |
544 | lang_mask, DK_UNSPECIFIED, handlers)) | |
545 | error ("unrecognized command line option %qs", opt); | |
546 | } | |
547 | ||
548 | /* Set any variable for option OPT_INDEX according to VALUE and ARG, | |
549 | diagnostic kind KIND. */ | |
550 | ||
551 | void | |
552 | set_option (int opt_index, int value, const char *arg, int kind) | |
553 | { | |
554 | const struct cl_option *option = &cl_options[opt_index]; | |
555 | ||
556 | if (!option->flag_var) | |
557 | return; | |
558 | ||
559 | switch (option->var_type) | |
560 | { | |
561 | case CLVC_BOOLEAN: | |
562 | *(int *) option->flag_var = value; | |
563 | break; | |
564 | ||
565 | case CLVC_EQUAL: | |
566 | *(int *) option->flag_var = (value | |
567 | ? option->var_value | |
568 | : !option->var_value); | |
569 | break; | |
570 | ||
571 | case CLVC_BIT_CLEAR: | |
572 | case CLVC_BIT_SET: | |
573 | if ((value != 0) == (option->var_type == CLVC_BIT_SET)) | |
574 | *(int *) option->flag_var |= option->var_value; | |
575 | else | |
576 | *(int *) option->flag_var &= ~option->var_value; | |
577 | if (option->flag_var == &target_flags) | |
578 | target_flags_explicit |= option->var_value; | |
579 | break; | |
580 | ||
581 | case CLVC_STRING: | |
582 | *(const char **) option->flag_var = arg; | |
583 | break; | |
584 | } | |
585 | ||
586 | if ((diagnostic_t) kind != DK_UNSPECIFIED) | |
587 | diagnostic_classify_diagnostic (global_dc, opt_index, (diagnostic_t) kind, | |
588 | UNKNOWN_LOCATION); | |
589 | } |