Commit | Line | Data |
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bae7f79e ILT |
1 | // options.c -- handle command line options for gold |
2 | ||
3 | #include <iostream> | |
4 | ||
5 | #include "gold.h" | |
6 | #include "options.h" | |
7 | ||
61ba1cf9 ILT |
8 | namespace gold |
9 | { | |
10 | ||
bae7f79e ILT |
11 | // The information we keep for a single command line option. |
12 | ||
61ba1cf9 | 13 | struct options::One_option |
bae7f79e ILT |
14 | { |
15 | // The single character option name, or '\0' if this is only a long | |
16 | // option. | |
17 | char short_option; | |
18 | ||
19 | // The long option name, or NULL if this is only a short option. | |
20 | const char* long_option; | |
21 | ||
22 | // Description of the option for --help output, or NULL if there is none. | |
23 | const char* doc; | |
24 | ||
25 | // How to print the option name in --help output, or NULL to use the | |
26 | // default. | |
27 | const char* help_output; | |
28 | ||
29 | // Long option dash control. This is ignored if long_option is | |
30 | // NULL. | |
31 | enum | |
32 | { | |
33 | // Long option normally takes one dash; two dashes are also | |
34 | // accepted. | |
35 | ONE_DASH, | |
36 | // Long option normally takes two dashes; one dash is also | |
37 | // accepted. | |
38 | TWO_DASHES, | |
39 | // Long option always takes two dashes. | |
40 | EXACTLY_TWO_DASHES | |
41 | } dash; | |
42 | ||
43 | // Function for special handling, or NULL. Returns the number of | |
44 | // arguments to skip. This will normally be at least 1, but it may | |
45 | // be 0 if this function changes *argv. ARG points to the location | |
46 | // in *ARGV where the option starts, which may be helpful for a | |
47 | // short option. | |
61ba1cf9 | 48 | int (*special)(int argc, char** argv, char *arg, Command_line*); |
bae7f79e ILT |
49 | |
50 | // If this is a position independent option which does not take an | |
51 | // argument, this is the member function to call to record it. | |
61ba1cf9 | 52 | void (General_options::*general_noarg)(); |
bae7f79e ILT |
53 | |
54 | // If this is a position independent function which takes an | |
55 | // argument, this is the member function to call to record it. | |
61ba1cf9 | 56 | void (General_options::*general_arg)(const char*); |
bae7f79e ILT |
57 | |
58 | // If this is a position dependent option which does not take an | |
59 | // argument, this is the member function to call to record it. | |
61ba1cf9 | 60 | void (Position_dependent_options::*dependent_noarg)(); |
bae7f79e ILT |
61 | |
62 | // If this is a position dependent option which takes an argument, | |
63 | // this is the member function to record it. | |
61ba1cf9 | 64 | void (Position_dependent_options::*dependent_arg)(const char*); |
bae7f79e ILT |
65 | |
66 | // Return whether this option takes an argument. | |
67 | bool | |
68 | takes_argument() const | |
69 | { return this->general_arg != NULL || this->dependent_arg != NULL; } | |
70 | }; | |
71 | ||
61ba1cf9 | 72 | class options::Command_line_options |
bae7f79e ILT |
73 | { |
74 | public: | |
75 | static const One_option options[]; | |
76 | static const int options_size; | |
77 | }; | |
78 | ||
61ba1cf9 ILT |
79 | } // End namespace gold. |
80 | ||
bae7f79e ILT |
81 | namespace |
82 | { | |
83 | ||
61ba1cf9 ILT |
84 | // Handle the special -l option, which adds an input file. |
85 | ||
86 | int | |
87 | library(int argc, char** argv, char* arg, gold::Command_line* cmdline) | |
88 | { | |
89 | return cmdline->process_l_option(argc, argv, arg); | |
90 | } | |
91 | ||
ead1e424 ILT |
92 | // Handle the special --start-group option. |
93 | ||
94 | int | |
95 | start_group(int, char**, char* arg, gold::Command_line* cmdline) | |
96 | { | |
97 | cmdline->start_group(arg); | |
98 | return 1; | |
99 | } | |
100 | ||
101 | // Handle the special --end-group option. | |
102 | ||
103 | int | |
104 | end_group(int, char**, char* arg, gold::Command_line* cmdline) | |
105 | { | |
106 | cmdline->end_group(arg); | |
107 | return 1; | |
108 | } | |
109 | ||
bae7f79e ILT |
110 | // Report usage information for ld --help, and exit. |
111 | ||
112 | int | |
113 | help(int, char**, char*, gold::Command_line*) | |
114 | { | |
115 | printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name); | |
116 | ||
117 | const int options_size = gold::options::Command_line_options::options_size; | |
118 | const gold::options::One_option* options = | |
119 | gold::options::Command_line_options::options; | |
120 | for (int i = 0; i < options_size; ++i) | |
121 | { | |
122 | if (options[i].doc == NULL) | |
123 | continue; | |
124 | ||
125 | printf(" "); | |
126 | int len = 2; | |
127 | bool comma = false; | |
128 | ||
129 | int j = i; | |
130 | do | |
131 | { | |
132 | if (options[j].help_output != NULL) | |
133 | { | |
134 | if (comma) | |
135 | { | |
136 | printf(", "); | |
137 | len += 2; | |
138 | } | |
139 | printf(options[j].help_output); | |
140 | len += std::strlen(options[i].help_output); | |
141 | } | |
142 | else | |
143 | { | |
144 | if (options[j].short_option != '\0') | |
145 | { | |
146 | if (comma) | |
147 | { | |
148 | printf(", "); | |
149 | len += 2; | |
150 | } | |
151 | printf("-%c", options[j].short_option); | |
152 | len += 2; | |
153 | } | |
154 | ||
155 | if (options[j].long_option != NULL) | |
156 | { | |
157 | if (comma) | |
158 | { | |
159 | printf(", "); | |
160 | len += 2; | |
161 | } | |
162 | if (options[j].dash == gold::options::One_option::ONE_DASH) | |
163 | { | |
164 | printf("-"); | |
165 | ++len; | |
166 | } | |
167 | else | |
168 | { | |
169 | printf("--"); | |
170 | len += 2; | |
171 | } | |
172 | printf("%s", options[j].long_option); | |
173 | len += std::strlen(options[j].long_option); | |
174 | } | |
175 | } | |
176 | ++j; | |
177 | } | |
178 | while (j < options_size && options[j].doc == NULL); | |
179 | ||
180 | if (len > 30) | |
181 | { | |
182 | printf("\n"); | |
183 | len = 0; | |
184 | } | |
185 | for (; len < 30; ++len) | |
186 | std::putchar(' '); | |
187 | ||
188 | std::puts(options[i].doc); | |
189 | } | |
190 | ||
191 | gold::gold_exit(true); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
61ba1cf9 ILT |
196 | } // End anonymous namespace. |
197 | ||
198 | namespace gold | |
199 | { | |
bae7f79e ILT |
200 | |
201 | // Helper macros used to specify the options. We could also do this | |
202 | // using constructors, but then g++ would generate code to initialize | |
203 | // the array. We want the array to be initialized statically so that | |
204 | // we get better startup time. | |
205 | ||
206 | #define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \ | |
61ba1cf9 | 207 | { short_option, long_option, doc, help, options::One_option::dash, \ |
bae7f79e ILT |
208 | NULL, func, NULL, NULL, NULL } |
209 | #define GENERAL_ARG(short_option, long_option, doc, help, dash, func) \ | |
61ba1cf9 | 210 | { short_option, long_option, doc, help, options::One_option::dash, \ |
bae7f79e ILT |
211 | NULL, NULL, func, NULL, NULL } |
212 | #define POSDEP_NOARG(short_option, long_option, doc, help, dash, func) \ | |
61ba1cf9 | 213 | { short_option, long_option, doc, help, options::One_option::dash, \ |
bae7f79e ILT |
214 | NULL, NULL, NULL, func, NULL } |
215 | #define POSDEP_ARG(short_option, long_option, doc, help, dash, func) \ | |
61ba1cf9 | 216 | { short_option, long_option, doc, help, options::One_option::dash, \ |
bae7f79e ILT |
217 | NULL, NULL, NULL, NULL, func } |
218 | #define SPECIAL(short_option, long_option, doc, help, dash, func) \ | |
61ba1cf9 | 219 | { short_option, long_option, doc, help, options::One_option::dash, \ |
bae7f79e ILT |
220 | func, NULL, NULL, NULL, NULL } |
221 | ||
222 | // Here is the actual list of options which we accept. | |
223 | ||
61ba1cf9 ILT |
224 | const options::One_option |
225 | options::Command_line_options::options[] = | |
bae7f79e | 226 | { |
61ba1cf9 ILT |
227 | SPECIAL('l', "library", N_("Search for library LIBNAME"), |
228 | N_("-lLIBNAME --library LIBNAME"), TWO_DASHES, | |
229 | &library), | |
ead1e424 ILT |
230 | SPECIAL('(', "start-group", N_("Start a library search group"), NULL, |
231 | TWO_DASHES, &start_group), | |
232 | SPECIAL(')', "end-group", N_("End a library search group"), NULL, | |
233 | TWO_DASHES, &end_group), | |
dbe717ef ILT |
234 | GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"), |
235 | N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES, | |
236 | &General_options::set_dynamic_linker), | |
bae7f79e ILT |
237 | GENERAL_ARG('L', "library-path", N_("Add directory to search path"), |
238 | N_("-L DIR, --library-path DIR"), TWO_DASHES, | |
61ba1cf9 | 239 | &General_options::add_to_search_path), |
652ec9bd ILT |
240 | GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH, |
241 | &General_options::ignore), | |
61ba1cf9 ILT |
242 | GENERAL_ARG('o', "output", N_("Set output file name"), |
243 | N_("-o FILE, --output FILE"), TWO_DASHES, | |
244 | &General_options::set_output_file_name), | |
bae7f79e | 245 | GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL, |
61ba1cf9 | 246 | ONE_DASH, &General_options::set_relocatable), |
92e059d8 ILT |
247 | GENERAL_NOARG('\0', "shared", N_("Generate shared library"), |
248 | NULL, ONE_DASH, &General_options::set_shared), | |
bae7f79e | 249 | GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"), |
61ba1cf9 | 250 | NULL, ONE_DASH, &General_options::set_static), |
dbe717ef ILT |
251 | POSDEP_NOARG('\0', "as-needed", |
252 | N_("Only set DT_NEEDED for following dynamic libs if used"), | |
253 | NULL, TWO_DASHES, &Position_dependent_options::set_as_needed), | |
254 | POSDEP_NOARG('\0', "no-as-needed", | |
255 | N_("Always DT_NEEDED for following dynamic libs (default)"), | |
256 | NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed), | |
bae7f79e ILT |
257 | SPECIAL('\0', "help", N_("Report usage information"), NULL, |
258 | TWO_DASHES, &help) | |
259 | }; | |
260 | ||
61ba1cf9 | 261 | const int options::Command_line_options::options_size = |
bae7f79e ILT |
262 | sizeof (options) / sizeof (options[0]); |
263 | ||
264 | // The default values for the general options. | |
265 | ||
61ba1cf9 | 266 | General_options::General_options() |
dbe717ef ILT |
267 | : dynamic_linker_(NULL), |
268 | search_path_(), | |
61ba1cf9 ILT |
269 | output_file_name_("a.out"), |
270 | is_relocatable_(false), | |
92e059d8 | 271 | is_shared_(false), |
61ba1cf9 | 272 | is_static_(false) |
bae7f79e ILT |
273 | { |
274 | } | |
275 | ||
276 | // The default values for the position dependent options. | |
277 | ||
61ba1cf9 | 278 | Position_dependent_options::Position_dependent_options() |
bae7f79e ILT |
279 | : do_static_search_(false) |
280 | { | |
281 | } | |
282 | ||
dbe717ef ILT |
283 | // Input_arguments methods. |
284 | ||
285 | // Add a file to the list. | |
286 | ||
287 | void | |
288 | Input_arguments::add_file(const Input_file_argument& file) | |
289 | { | |
290 | if (!this->in_group_) | |
291 | this->input_argument_list_.push_back(Input_argument(file)); | |
292 | else | |
293 | { | |
294 | assert(!this->input_argument_list_.empty()); | |
295 | assert(this->input_argument_list_.back().is_group()); | |
296 | this->input_argument_list_.back().group()->add_file(file); | |
297 | } | |
298 | } | |
299 | ||
300 | // Start a group. | |
301 | ||
302 | void | |
303 | Input_arguments::start_group() | |
304 | { | |
305 | assert(!this->in_group_); | |
306 | Input_file_group* group = new Input_file_group(); | |
307 | this->input_argument_list_.push_back(Input_argument(group)); | |
308 | this->in_group_ = true; | |
309 | } | |
310 | ||
311 | // End a group. | |
312 | ||
313 | void | |
314 | Input_arguments::end_group() | |
315 | { | |
316 | assert(this->in_group_); | |
317 | this->in_group_ = false; | |
318 | } | |
319 | ||
ead1e424 | 320 | // Command_line options. |
bae7f79e | 321 | |
61ba1cf9 | 322 | Command_line::Command_line() |
dbe717ef | 323 | : options_(), position_options_(), inputs_() |
bae7f79e ILT |
324 | { |
325 | } | |
326 | ||
327 | // Process the command line options. | |
328 | ||
329 | void | |
61ba1cf9 | 330 | Command_line::process(int argc, char** argv) |
bae7f79e | 331 | { |
61ba1cf9 ILT |
332 | const int options_size = options::Command_line_options::options_size; |
333 | const options::One_option* options = | |
334 | options::Command_line_options::options; | |
bae7f79e ILT |
335 | bool no_more_options = false; |
336 | int i = 0; | |
337 | while (i < argc) | |
338 | { | |
339 | if (argv[i][0] != '-' || no_more_options) | |
340 | { | |
ead1e424 | 341 | this->add_file(argv[i], false); |
bae7f79e ILT |
342 | ++i; |
343 | continue; | |
344 | } | |
345 | ||
346 | // Option starting with '-'. | |
347 | int dashes = 1; | |
348 | if (argv[i][1] == '-') | |
349 | { | |
350 | dashes = 2; | |
351 | if (argv[i][2] == '\0') | |
352 | { | |
353 | no_more_options = true; | |
354 | continue; | |
355 | } | |
356 | } | |
357 | ||
358 | // Look for a long option match. | |
359 | char* opt = argv[i] + dashes; | |
360 | char first = opt[0]; | |
361 | int skiparg = 0; | |
362 | char* arg = strchr(opt, '='); | |
363 | if (arg != NULL) | |
364 | *arg = '\0'; | |
365 | else if (i + 1 < argc) | |
366 | { | |
367 | arg = argv[i + 1]; | |
368 | skiparg = 1; | |
369 | } | |
370 | ||
371 | int j; | |
372 | for (j = 0; j < options_size; ++j) | |
373 | { | |
374 | if (options[j].long_option != NULL | |
375 | && (dashes == 2 | |
376 | || (options[j].dash | |
61ba1cf9 | 377 | != options::One_option::EXACTLY_TWO_DASHES)) |
bae7f79e ILT |
378 | && first == options[j].long_option[0] |
379 | && strcmp(opt, options[j].long_option) == 0) | |
380 | { | |
381 | if (options[j].special) | |
382 | i += options[j].special(argc - 1, argv + i, opt, this); | |
383 | else | |
384 | { | |
385 | if (!options[j].takes_argument()) | |
386 | { | |
387 | arg = NULL; | |
388 | skiparg = 0; | |
389 | } | |
390 | else | |
391 | { | |
392 | if (arg == NULL) | |
393 | this->usage(_("missing argument"), argv[i]); | |
394 | } | |
395 | this->apply_option(options[j], arg); | |
396 | i += skiparg + 1; | |
397 | } | |
398 | break; | |
399 | } | |
400 | } | |
401 | if (j < options_size) | |
402 | continue; | |
403 | ||
404 | // If we saw two dashes, we need to see a long option. | |
405 | if (dashes == 2) | |
406 | this->usage(_("unknown option"), argv[i]); | |
407 | ||
408 | // Look for a short option match. There may be more than one | |
409 | // short option in a given argument. | |
410 | bool done = false; | |
411 | char* s = argv[i] + 1; | |
412 | ++i; | |
413 | while (*s != '\0' && !done) | |
414 | { | |
415 | char opt = *s; | |
416 | int j; | |
417 | for (j = 0; j < options_size; ++j) | |
418 | { | |
419 | if (options[j].short_option == opt) | |
420 | { | |
421 | if (options[j].special) | |
422 | { | |
423 | // Undo the argument skip done above. | |
424 | --i; | |
425 | i += options[j].special(argc - i, argv + i, s, this); | |
426 | done = true; | |
427 | } | |
428 | else | |
429 | { | |
430 | arg = NULL; | |
431 | if (options[j].takes_argument()) | |
432 | { | |
433 | if (s[1] != '\0') | |
434 | { | |
435 | arg = s + 1; | |
436 | done = true; | |
437 | } | |
438 | else if (i < argc) | |
439 | { | |
440 | arg = argv[i]; | |
441 | ++i; | |
442 | } | |
443 | else | |
444 | this->usage(_("missing argument"), opt); | |
445 | } | |
446 | this->apply_option(options[j], arg); | |
447 | } | |
448 | break; | |
449 | } | |
450 | } | |
451 | ||
452 | if (j >= options_size) | |
453 | this->usage(_("unknown option"), *s); | |
454 | ||
455 | ++s; | |
456 | } | |
457 | } | |
61ba1cf9 | 458 | |
dbe717ef | 459 | if (this->inputs_.in_group()) |
ead1e424 ILT |
460 | { |
461 | fprintf(stderr, _("%s: missing group end"), program_name); | |
462 | this->usage(); | |
463 | } | |
464 | ||
61ba1cf9 ILT |
465 | // FIXME: We should only do this when configured in native mode. |
466 | this->options_.add_to_search_path("/lib"); | |
467 | this->options_.add_to_search_path("/usr/lib"); | |
bae7f79e ILT |
468 | } |
469 | ||
470 | // Apply a command line option. | |
471 | ||
472 | void | |
61ba1cf9 ILT |
473 | Command_line::apply_option(const options::One_option& opt, |
474 | const char* arg) | |
bae7f79e ILT |
475 | { |
476 | if (arg == NULL) | |
477 | { | |
478 | if (opt.general_noarg) | |
479 | (this->options_.*(opt.general_noarg))(); | |
480 | else if (opt.dependent_noarg) | |
481 | (this->position_options_.*(opt.dependent_noarg))(); | |
482 | else | |
61ba1cf9 | 483 | gold_unreachable(); |
bae7f79e ILT |
484 | } |
485 | else | |
486 | { | |
487 | if (opt.general_arg) | |
488 | (this->options_.*(opt.general_arg))(arg); | |
489 | else if (opt.dependent_arg) | |
490 | (this->position_options_.*(opt.dependent_arg))(arg); | |
491 | else | |
61ba1cf9 | 492 | gold_unreachable(); |
bae7f79e ILT |
493 | } |
494 | } | |
495 | ||
ead1e424 ILT |
496 | // Add an input file or library. |
497 | ||
498 | void | |
499 | Command_line::add_file(const char* name, bool is_lib) | |
500 | { | |
501 | Input_file_argument file(name, is_lib, this->position_options_); | |
dbe717ef | 502 | this->inputs_.add_file(file); |
ead1e424 ILT |
503 | } |
504 | ||
61ba1cf9 ILT |
505 | // Handle the -l option, which requires special treatment. |
506 | ||
507 | int | |
508 | Command_line::process_l_option(int argc, char** argv, char* arg) | |
509 | { | |
510 | int ret; | |
511 | const char* libname; | |
512 | if (arg[1] != '\0') | |
513 | { | |
514 | ret = 1; | |
515 | libname = arg + 1; | |
516 | } | |
517 | else if (argc > 1) | |
518 | { | |
519 | ret = 2; | |
520 | libname = argv[argc + 1]; | |
521 | } | |
522 | else | |
523 | this->usage(_("missing argument"), arg); | |
524 | ||
ead1e424 | 525 | this->add_file(libname, true); |
61ba1cf9 ILT |
526 | |
527 | return ret; | |
528 | } | |
529 | ||
ead1e424 ILT |
530 | // Handle the --start-group option. |
531 | ||
532 | void | |
533 | Command_line::start_group(const char* arg) | |
534 | { | |
dbe717ef | 535 | if (this->inputs_.in_group()) |
ead1e424 | 536 | this->usage(_("may not nest groups"), arg); |
dbe717ef | 537 | this->inputs_.start_group(); |
ead1e424 ILT |
538 | } |
539 | ||
540 | // Handle the --end-group option. | |
541 | ||
542 | void | |
543 | Command_line::end_group(const char* arg) | |
544 | { | |
dbe717ef | 545 | if (!this->inputs_.in_group()) |
ead1e424 | 546 | this->usage(_("group end without group start"), arg); |
dbe717ef | 547 | this->inputs_.end_group(); |
ead1e424 ILT |
548 | } |
549 | ||
bae7f79e ILT |
550 | // Report a usage error. */ |
551 | ||
552 | void | |
61ba1cf9 | 553 | Command_line::usage() |
bae7f79e ILT |
554 | { |
555 | fprintf(stderr, | |
556 | _("%s: use the --help option for usage information\n"), | |
61ba1cf9 ILT |
557 | program_name); |
558 | gold_exit(false); | |
bae7f79e ILT |
559 | } |
560 | ||
561 | void | |
61ba1cf9 | 562 | Command_line::usage(const char* msg, const char *opt) |
bae7f79e ILT |
563 | { |
564 | fprintf(stderr, | |
565 | _("%s: %s: %s\n"), | |
61ba1cf9 | 566 | program_name, opt, msg); |
bae7f79e ILT |
567 | this->usage(); |
568 | } | |
569 | ||
570 | void | |
61ba1cf9 | 571 | Command_line::usage(const char* msg, char opt) |
bae7f79e ILT |
572 | { |
573 | fprintf(stderr, | |
574 | _("%s: -%c: %s\n"), | |
61ba1cf9 | 575 | program_name, opt, msg); |
bae7f79e ILT |
576 | this->usage(); |
577 | } | |
61ba1cf9 ILT |
578 | |
579 | } // End namespace gold. |