main.c revision 1.1.1.9 1 /* $NetBSD: main.c,v 1.1.1.9 2017/02/11 19:30:02 christos Exp $ */
2
3 /* Id: main.c,v 1.59 2017/02/02 00:44:38 tom Exp */
4
5 #include <signal.h>
6 #ifndef _WIN32
7 #include <unistd.h> /* for _exit() */
8 #else
9 #include <stdlib.h> /* for _exit() */
10 #endif
11
12 #include "defs.h"
13
14 #ifdef HAVE_MKSTEMP
15 # define USE_MKSTEMP 1
16 #elif defined(HAVE_FCNTL_H)
17 # define USE_MKSTEMP 1
18 # include <fcntl.h> /* for open(), O_EXCL, etc. */
19 #else
20 # define USE_MKSTEMP 0
21 #endif
22
23 #if USE_MKSTEMP
24 #include <sys/types.h>
25 #include <sys/stat.h>
26
27 typedef struct _my_tmpfiles
28 {
29 struct _my_tmpfiles *next;
30 char *name;
31 }
32 MY_TMPFILES;
33
34 static MY_TMPFILES *my_tmpfiles;
35 #endif /* USE_MKSTEMP */
36
37 char dflag;
38 char gflag;
39 char iflag;
40 char lflag;
41 static char oflag;
42 char rflag;
43 char sflag;
44 char tflag;
45 char vflag;
46
47 const char *symbol_prefix;
48 const char *myname = "yacc";
49
50 int lineno;
51 int outline;
52
53 static char default_file_prefix[] = "y";
54
55 static char *file_prefix = default_file_prefix;
56
57 char *code_file_name;
58 char *input_file_name;
59 size_t input_file_name_len = 0;
60 char *defines_file_name;
61 char *externs_file_name;
62
63 static char *graph_file_name;
64 static char *output_file_name;
65 static char *verbose_file_name;
66
67 FILE *action_file; /* a temp file, used to save actions associated */
68 /* with rules until the parser is written */
69 FILE *code_file; /* y.code.c (used when the -r option is specified) */
70 FILE *defines_file; /* y.tab.h */
71 FILE *externs_file; /* y.tab.i */
72 FILE *input_file; /* the input file */
73 FILE *output_file; /* y.tab.c */
74 FILE *text_file; /* a temp file, used to save text until all */
75 /* symbols have been defined */
76 FILE *union_file; /* a temp file, used to save the union */
77 /* definition until all symbol have been */
78 /* defined */
79 FILE *verbose_file; /* y.output */
80 FILE *graph_file; /* y.dot */
81
82 Value_t nitems;
83 Value_t nrules;
84 Value_t nsyms;
85 Value_t ntokens;
86 Value_t nvars;
87
88 Value_t start_symbol;
89 char **symbol_name;
90 char **symbol_pname;
91 Value_t *symbol_value;
92 Value_t *symbol_prec;
93 char *symbol_assoc;
94
95 int pure_parser;
96 int token_table;
97 int error_verbose;
98
99 #if defined(YYBTYACC)
100 Value_t *symbol_pval;
101 char **symbol_destructor;
102 char **symbol_type_tag;
103 int locations = 0; /* default to no position processing */
104 int backtrack = 0; /* default is no backtracking */
105 char *initial_action = NULL;
106 #endif
107
108 int exit_code;
109
110 Value_t *ritem;
111 Value_t *rlhs;
112 Value_t *rrhs;
113 Value_t *rprec;
114 Assoc_t *rassoc;
115 Value_t **derives;
116 char *nullable;
117
118 /*
119 * Since fclose() is called via the signal handler, it might die. Don't loop
120 * if there is a problem closing a file.
121 */
122 #define DO_CLOSE(fp) \
123 if (fp != 0) { \
124 FILE *use = fp; \
125 fp = 0; \
126 fclose(use); \
127 }
128
129 static int got_intr = 0;
130
131 void
132 done(int k)
133 {
134 DO_CLOSE(input_file);
135 DO_CLOSE(output_file);
136 if (iflag)
137 DO_CLOSE(externs_file);
138 if (rflag)
139 DO_CLOSE(code_file);
140
141 DO_CLOSE(action_file);
142 DO_CLOSE(defines_file);
143 DO_CLOSE(graph_file);
144 DO_CLOSE(text_file);
145 DO_CLOSE(union_file);
146 DO_CLOSE(verbose_file);
147
148 if (got_intr)
149 _exit(EXIT_FAILURE);
150
151 #ifdef NO_LEAKS
152 if (rflag)
153 DO_FREE(code_file_name);
154
155 if (dflag)
156 DO_FREE(defines_file_name);
157
158 if (iflag)
159 DO_FREE(externs_file_name);
160
161 if (oflag)
162 DO_FREE(output_file_name);
163
164 if (vflag)
165 DO_FREE(verbose_file_name);
166
167 if (gflag)
168 DO_FREE(graph_file_name);
169
170 lr0_leaks();
171 lalr_leaks();
172 mkpar_leaks();
173 mstring_leaks();
174 output_leaks();
175 reader_leaks();
176 #endif
177
178 exit(k);
179 }
180
181 static void
182 onintr(int sig GCC_UNUSED)
183 {
184 got_intr = 1;
185 done(EXIT_FAILURE);
186 }
187
188 static void
189 set_signals(void)
190 {
191 #ifdef SIGINT
192 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
193 signal(SIGINT, onintr);
194 #endif
195 #ifdef SIGTERM
196 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
197 signal(SIGTERM, onintr);
198 #endif
199 #ifdef SIGHUP
200 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
201 signal(SIGHUP, onintr);
202 #endif
203 }
204
205 static void
206 usage(void)
207 {
208 static const char *msg[] =
209 {
210 ""
211 ,"Options:"
212 ," -b file_prefix set filename prefix (default \"y.\")"
213 ," -B create a backtracking parser"
214 ," -d write definitions (" DEFINES_SUFFIX ")"
215 ," -i write interface (y.tab.i)"
216 ," -g write a graphical description"
217 ," -l suppress #line directives"
218 ," -L enable position processing, e.g., \"%locations\""
219 ," -o output_file (default \"" OUTPUT_SUFFIX "\")"
220 ," -p symbol_prefix set symbol prefix (default \"yy\")"
221 ," -P create a reentrant parser, e.g., \"%pure-parser\""
222 ," -r produce separate code and table files (y.code.c)"
223 ," -s suppress #define's for quoted names in %token lines"
224 ," -t add debugging support"
225 ," -v write description (y.output)"
226 ," -V show version information and exit"
227 };
228 unsigned n;
229
230 fflush(stdout);
231 fprintf(stderr, "Usage: %s [options] filename\n", myname);
232 for (n = 0; n < sizeof(msg) / sizeof(msg[0]); ++n)
233 fprintf(stderr, "%s\n", msg[n]);
234
235 exit(1);
236 }
237
238 static void
239 setflag(int ch)
240 {
241 switch (ch)
242 {
243 case 'B':
244 #if defined(YYBTYACC)
245 backtrack = 1;
246 #else
247 unsupported_flag_warning("-B", "reconfigure with --enable-btyacc");
248 #endif
249 break;
250
251 case 'd':
252 dflag = 1;
253 break;
254
255 case 'g':
256 gflag = 1;
257 break;
258
259 case 'i':
260 iflag = 1;
261 break;
262
263 case 'l':
264 lflag = 1;
265 break;
266
267 case 'L':
268 #if defined(YYBTYACC)
269 locations = 1;
270 #else
271 unsupported_flag_warning("-B", "reconfigure with --enable-btyacc");
272 #endif
273 break;
274
275 case 'P':
276 pure_parser = 1;
277 break;
278
279 case 'r':
280 rflag = 1;
281 break;
282
283 case 's':
284 sflag = 1;
285 break;
286
287 case 't':
288 tflag = 1;
289 break;
290
291 case 'v':
292 vflag = 1;
293 break;
294
295 case 'V':
296 printf("%s - %s\n", myname, VERSION);
297 exit(EXIT_SUCCESS);
298
299 case 'y':
300 /* noop for bison compatibility. byacc is already designed to be posix
301 * yacc compatible. */
302 break;
303
304 default:
305 usage();
306 }
307 }
308
309 static void
310 getargs(int argc, char *argv[])
311 {
312 int i;
313 char *s;
314 int ch;
315
316 if (argc > 0)
317 myname = argv[0];
318
319 for (i = 1; i < argc; ++i)
320 {
321 s = argv[i];
322 if (*s != '-')
323 break;
324 switch (ch = *++s)
325 {
326 case '\0':
327 input_file = stdin;
328 if (i + 1 < argc)
329 usage();
330 return;
331
332 case '-':
333 ++i;
334 goto no_more_options;
335
336 case 'b':
337 if (*++s)
338 file_prefix = s;
339 else if (++i < argc)
340 file_prefix = argv[i];
341 else
342 usage();
343 continue;
344
345 case 'o':
346 if (*++s)
347 output_file_name = s;
348 else if (++i < argc)
349 output_file_name = argv[i];
350 else
351 usage();
352 continue;
353
354 case 'p':
355 if (*++s)
356 symbol_prefix = s;
357 else if (++i < argc)
358 symbol_prefix = argv[i];
359 else
360 usage();
361 continue;
362
363 default:
364 setflag(ch);
365 break;
366 }
367
368 for (;;)
369 {
370 switch (ch = *++s)
371 {
372 case '\0':
373 goto end_of_option;
374
375 default:
376 setflag(ch);
377 break;
378 }
379 }
380 end_of_option:;
381 }
382
383 no_more_options:;
384 if (i + 1 != argc)
385 usage();
386 input_file_name_len = strlen(argv[i]);
387 input_file_name = TMALLOC(char, input_file_name_len + 1);
388 NO_SPACE(input_file_name);
389 strcpy(input_file_name, argv[i]);
390 }
391
392 void *
393 allocate(size_t n)
394 {
395 void *p;
396
397 p = NULL;
398 if (n)
399 {
400 p = CALLOC(1, n);
401 NO_SPACE(p);
402 }
403 return (p);
404 }
405
406 #define CREATE_FILE_NAME(dest, suffix) \
407 dest = alloc_file_name(len, suffix)
408
409 static char *
410 alloc_file_name(size_t len, const char *suffix)
411 {
412 char *result = TMALLOC(char, len + strlen(suffix) + 1);
413 if (result == 0)
414 no_space();
415 strcpy(result, file_prefix);
416 strcpy(result + len, suffix);
417 return result;
418 }
419
420 static char *
421 find_suffix(char *name, const char *suffix)
422 {
423 size_t len = strlen(name);
424 size_t slen = strlen(suffix);
425 if (len >= slen)
426 {
427 name += len - slen;
428 if (strcmp(name, suffix) == 0)
429 return name;
430 }
431 return NULL;
432 }
433
434 static void
435 create_file_names(void)
436 {
437 size_t len;
438 const char *defines_suffix;
439 const char *externs_suffix;
440 char *suffix;
441
442 suffix = NULL;
443 defines_suffix = DEFINES_SUFFIX;
444 externs_suffix = EXTERNS_SUFFIX;
445
446 /* compute the file_prefix from the user provided output_file_name */
447 if (output_file_name != 0)
448 {
449 if (!(suffix = find_suffix(output_file_name, OUTPUT_SUFFIX))
450 && (suffix = find_suffix(output_file_name, ".c")))
451 {
452 defines_suffix = ".h";
453 externs_suffix = ".i";
454 }
455 }
456
457 if (suffix != NULL)
458 {
459 len = (size_t) (suffix - output_file_name);
460 file_prefix = TMALLOC(char, len + 1);
461 NO_SPACE(file_prefix);
462 strncpy(file_prefix, output_file_name, len)[len] = 0;
463 }
464 else
465 len = strlen(file_prefix);
466
467 /* if "-o filename" was not given */
468 if (output_file_name == 0)
469 {
470 oflag = 1;
471 CREATE_FILE_NAME(output_file_name, OUTPUT_SUFFIX);
472 }
473
474 if (rflag)
475 {
476 CREATE_FILE_NAME(code_file_name, CODE_SUFFIX);
477 }
478 else
479 code_file_name = output_file_name;
480
481 if (dflag)
482 {
483 CREATE_FILE_NAME(defines_file_name, defines_suffix);
484 }
485
486 if (iflag)
487 {
488 CREATE_FILE_NAME(externs_file_name, externs_suffix);
489 }
490
491 if (vflag)
492 {
493 CREATE_FILE_NAME(verbose_file_name, VERBOSE_SUFFIX);
494 }
495
496 if (gflag)
497 {
498 CREATE_FILE_NAME(graph_file_name, GRAPH_SUFFIX);
499 }
500
501 if (suffix != NULL)
502 {
503 FREE(file_prefix);
504 }
505 }
506
507 #if USE_MKSTEMP
508 static void
509 close_tmpfiles(void)
510 {
511 while (my_tmpfiles != 0)
512 {
513 MY_TMPFILES *next = my_tmpfiles->next;
514
515 (void)chmod(my_tmpfiles->name, 0644);
516 (void)unlink(my_tmpfiles->name);
517
518 free(my_tmpfiles->name);
519 free(my_tmpfiles);
520
521 my_tmpfiles = next;
522 }
523 }
524
525 #ifndef HAVE_MKSTEMP
526 static int
527 my_mkstemp(char *temp)
528 {
529 int fd;
530 char *dname;
531 char *fname;
532 char *name;
533
534 /*
535 * Split-up to use tempnam, rather than tmpnam; the latter (like
536 * mkstemp) is unusable on Windows.
537 */
538 if ((fname = strrchr(temp, '/')) != 0)
539 {
540 dname = strdup(temp);
541 dname[++fname - temp] = '\0';
542 }
543 else
544 {
545 dname = 0;
546 fname = temp;
547 }
548 if ((name = tempnam(dname, fname)) != 0)
549 {
550 fd = open(name, O_CREAT | O_EXCL | O_RDWR);
551 strcpy(temp, name);
552 }
553 else
554 {
555 fd = -1;
556 }
557
558 if (dname != 0)
559 free(dname);
560
561 return fd;
562 }
563 #define mkstemp(s) my_mkstemp(s)
564 #endif
565
566 #endif
567
568 /*
569 * tmpfile() should be adequate, except that it may require special privileges
570 * to use, e.g., MinGW and Windows 7 where it tries to use the root directory.
571 */
572 static FILE *
573 open_tmpfile(const char *label)
574 {
575 #define MY_FMT "%s/%.*sXXXXXX"
576 FILE *result;
577 #if USE_MKSTEMP
578 int fd;
579 const char *tmpdir;
580 char *name;
581 const char *mark;
582
583 if ((tmpdir = getenv("TMPDIR")) == 0 || access(tmpdir, W_OK) != 0)
584 {
585 #ifdef P_tmpdir
586 tmpdir = P_tmpdir;
587 #else
588 tmpdir = "/tmp";
589 #endif
590 if (access(tmpdir, W_OK) != 0)
591 tmpdir = ".";
592 }
593
594 /* The size of the format is guaranteed to be longer than the result from
595 * printing empty strings with it; this calculation accounts for the
596 * string-lengths as well.
597 */
598 name = malloc(strlen(tmpdir) + sizeof(MY_FMT) + strlen(label));
599
600 result = 0;
601 if (name != 0)
602 {
603 mode_t save_umask = umask(0177);
604
605 if ((mark = strrchr(label, '_')) == 0)
606 mark = label + strlen(label);
607
608 sprintf(name, MY_FMT, tmpdir, (int)(mark - label), label);
609 fd = mkstemp(name);
610 if (fd >= 0)
611 {
612 result = fdopen(fd, "w+");
613 if (result != 0)
614 {
615 MY_TMPFILES *item;
616
617 if (my_tmpfiles == 0)
618 {
619 atexit(close_tmpfiles);
620 }
621
622 item = NEW(MY_TMPFILES);
623 NO_SPACE(item);
624
625 item->name = name;
626 NO_SPACE(item->name);
627
628 item->next = my_tmpfiles;
629 my_tmpfiles = item;
630 }
631 }
632 (void)umask(save_umask);
633 }
634 #else
635 result = tmpfile();
636 #endif
637
638 if (result == 0)
639 open_error(label);
640 return result;
641 #undef MY_FMT
642 }
643
644 static void
645 open_files(void)
646 {
647 create_file_names();
648
649 if (input_file == 0)
650 {
651 input_file = fopen(input_file_name, "r");
652 if (input_file == 0)
653 open_error(input_file_name);
654 }
655
656 action_file = open_tmpfile("action_file");
657 text_file = open_tmpfile("text_file");
658
659 if (vflag)
660 {
661 verbose_file = fopen(verbose_file_name, "w");
662 if (verbose_file == 0)
663 open_error(verbose_file_name);
664 }
665
666 if (gflag)
667 {
668 graph_file = fopen(graph_file_name, "w");
669 if (graph_file == 0)
670 open_error(graph_file_name);
671 fprintf(graph_file, "digraph %s {\n", file_prefix);
672 fprintf(graph_file, "\tedge [fontsize=10];\n");
673 fprintf(graph_file, "\tnode [shape=box,fontsize=10];\n");
674 fprintf(graph_file, "\torientation=landscape;\n");
675 fprintf(graph_file, "\trankdir=LR;\n");
676 fprintf(graph_file, "\t/*\n");
677 fprintf(graph_file, "\tmargin=0.2;\n");
678 fprintf(graph_file, "\tpage=\"8.27,11.69\"; // for A4 printing\n");
679 fprintf(graph_file, "\tratio=auto;\n");
680 fprintf(graph_file, "\t*/\n");
681 }
682
683 if (dflag)
684 {
685 defines_file = fopen(defines_file_name, "w");
686 if (defines_file == 0)
687 open_error(defines_file_name);
688 union_file = open_tmpfile("union_file");
689 }
690
691 if (iflag)
692 {
693 externs_file = fopen(externs_file_name, "w");
694 if (externs_file == 0)
695 open_error(externs_file_name);
696 }
697
698 output_file = fopen(output_file_name, "w");
699 if (output_file == 0)
700 open_error(output_file_name);
701
702 if (rflag)
703 {
704 code_file = fopen(code_file_name, "w");
705 if (code_file == 0)
706 open_error(code_file_name);
707 }
708 else
709 code_file = output_file;
710 }
711
712 int
713 main(int argc, char *argv[])
714 {
715 SRexpect = -1;
716 RRexpect = -1;
717 exit_code = EXIT_SUCCESS;
718
719 set_signals();
720 getargs(argc, argv);
721 open_files();
722 reader();
723 lr0();
724 lalr();
725 make_parser();
726 graph();
727 finalize_closure();
728 verbose();
729 output();
730 done(exit_code);
731 /*NOTREACHED */
732 }
733