src/muscle_tab.c

   1 /* Muscle table manager for Bison.
   2
   3    Copyright (C) 2001-2007, 2009-2010 Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    This program is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <config.h>
  21 #include "system.h"
  22
  23 #include <hash.h>
  24 #include <quotearg.h>
  25
  26 #include "complain.h"
  27 #include "files.h"
  28 #include "muscle_tab.h"
  29 #include "getargs.h"
  30
  31 /* A key-value pair, along with storage that can be reclaimed when
  32    this pair is no longer needed.  */
  33 typedef struct
  34 {
  35   char const *key;
  36   char const *value;
  37   char *storage;
  38 } muscle_entry;
  39
  40 /* An obstack used to create some entries.  */
  41 struct obstack muscle_obstack;
  42
  43 /* Initial capacity of muscles hash table.  */
  44 #define HT_INITIAL_CAPACITY 257
  45
  46 static struct hash_table *muscle_table = NULL;
  47
  48 static bool
  49 hash_compare_muscles (void const *x, void const *y)
  50 {
  51   muscle_entry const *m1 = x;
  52   muscle_entry const *m2 = y;
  53   return strcmp (m1->key, m2->key) == 0;
  54 }
  55
  56 static size_t
  57 hash_muscle (const void *x, size_t tablesize)
  58 {
  59   muscle_entry const *m = x;
  60   return hash_string (m->key, tablesize);
  61 }
  62
  63 /*-----------------------------------------------------------------.
  64 | Create the MUSCLE_TABLE, and initialize it with default values.  |
  65 | Also set up the MUSCLE_OBSTACK.                                  |
  66 `-----------------------------------------------------------------*/
  67
  68 static void
  69 muscle_entry_free (void *entry)
  70 {
  71   muscle_entry *mentry = entry;
  72   free (mentry->storage);
  73   free (mentry);
  74 }
  75
  76 void
  77 muscle_init (void)
  78 {
  79   /* Initialize the muscle obstack.  */
  80   obstack_init (&muscle_obstack);
  81
  82   muscle_table = hash_initialize (HT_INITIAL_CAPACITY, NULL, hash_muscle,
  83                                   hash_compare_muscles, muscle_entry_free);
  84
  85   /* Version and input file.  */
  86   MUSCLE_INSERT_STRING ("version", VERSION);
  87   MUSCLE_INSERT_C_STRING ("file_name", grammar_file);
  88 }
  89
  90
  91 /*------------------------------------------------------------.
  92 | Free all the memory consumed by the muscle machinery only.  |
  93 `------------------------------------------------------------*/
  94
  95 void
  96 muscle_free (void)
  97 {
  98   hash_free (muscle_table);
  99   obstack_free (&muscle_obstack, NULL);
 100 }
 101
 102
 103
 104 /*------------------------------------------------------------.
 105 | Insert (KEY, VALUE).  If KEY already existed, overwrite the |
 106 | previous value.                                             |
 107 `------------------------------------------------------------*/
 108
 109 void
 110 muscle_insert (char const *key, char const *value)
 111 {
 112   muscle_entry probe;
 113   muscle_entry *entry;
 114
 115   probe.key = key;
 116   entry = hash_lookup (muscle_table, &probe);
 117
 118   if (!entry)
 119     {
 120       /* First insertion in the hash. */
 121       entry = xmalloc (sizeof *entry);
 122       entry->key = key;
 123       if (!hash_insert (muscle_table, entry))
 124         xalloc_die ();
 125     }
 126   else
 127     free (entry->storage);
 128   entry->value = value;
 129   entry->storage = NULL;
 130 }
 131
 132
 133 /*-------------------------------------------------------------------.
 134 | Append VALUE to the current value of KEY.  If KEY did not already  |
 135 | exist, create it.  Use MUSCLE_OBSTACK.  De-allocate the previously |
 136 | associated value.  Copy VALUE and SEPARATOR.                       |
 137 `-------------------------------------------------------------------*/
 138
 139 void
 140 muscle_grow (const char *key, const char *val, const char *separator)
 141 {
 142   muscle_entry probe;
 143   muscle_entry *entry = NULL;
 144
 145   probe.key = key;
 146   entry = hash_lookup (muscle_table, &probe);
 147
 148   if (!entry)
 149     {
 150       /* First insertion in the hash. */
 151       entry = xmalloc (sizeof *entry);
 152       entry->key = key;
 153       if (!hash_insert (muscle_table, entry))
 154         xalloc_die ();
 155       entry->value = entry->storage = xstrdup (val);
 156     }
 157   else
 158     {
 159       /* Grow the current value. */
 160       char *new_val;
 161       obstack_sgrow (&muscle_obstack, entry->value);
 162       free (entry->storage);
 163       obstack_sgrow (&muscle_obstack, separator);
 164       obstack_sgrow (&muscle_obstack, val);
 165       obstack_1grow (&muscle_obstack, 0);
 166       new_val = obstack_finish (&muscle_obstack);
 167       entry->value = entry->storage = xstrdup (new_val);
 168       obstack_free (&muscle_obstack, new_val);
 169     }
 170 }
 171
 172 /*------------------------------------------------------------------.
 173 | Using muscle_grow, append a synchronization line for the location |
 174 | LOC to the current value of KEY.                                  |
 175 `------------------------------------------------------------------*/
 176
 177 static void
 178 muscle_syncline_grow (char const *key, location loc)
 179 {
 180   char *extension = NULL;
 181   obstack_fgrow1 (&muscle_obstack, "]b4_syncline(%d, [[", loc.start.line);
 182   MUSCLE_OBSTACK_SGROW (&muscle_obstack,
 183                         quotearg_style (c_quoting_style, loc.start.file));
 184   obstack_sgrow (&muscle_obstack, "]])[");
 185   obstack_1grow (&muscle_obstack, 0);
 186   extension = obstack_finish (&muscle_obstack);
 187   muscle_grow (key, extension, "");
 188   obstack_free (&muscle_obstack, extension);
 189 }
 190
 191 /*------------------------------------------------------------------.
 192 | Append VALUE to the current value of KEY, using muscle_grow.  But |
 193 | in addition, issue a synchronization line for the location LOC    |
 194 | using muscle_syncline_grow.                                       |
 195 `------------------------------------------------------------------*/
 196
 197 void
 198 muscle_code_grow (const char *key, const char *val, location loc)
 199 {
 200   muscle_syncline_grow (key, loc);
 201   muscle_grow (key, val, "\n");
 202 }
 203
 204
 205 void muscle_pair_list_grow (const char *muscle,
 206                             const char *a1, const char *a2)
 207 {
 208   char *pair;
 209   obstack_sgrow (&muscle_obstack, "[[[");
 210   MUSCLE_OBSTACK_SGROW (&muscle_obstack, a1);
 211   obstack_sgrow (&muscle_obstack, "]], [[");
 212   MUSCLE_OBSTACK_SGROW (&muscle_obstack, a2);
 213   obstack_sgrow (&muscle_obstack, "]]]");
 214   obstack_1grow (&muscle_obstack, 0);
 215   pair = obstack_finish (&muscle_obstack);
 216   muscle_grow (muscle, pair, ",\n");
 217   obstack_free (&muscle_obstack, pair);
 218 }
 219
 220
 221 /*----------------------------------------------------------------------------.
 222 | Find the value of muscle KEY.  Unlike MUSCLE_FIND, this is always reliable  |
 223 | to determine whether KEY has a value.                                       |
 224 `----------------------------------------------------------------------------*/
 225
 226 char const *
 227 muscle_find_const (char const *key)
 228 {
 229   muscle_entry probe;
 230   muscle_entry *result = NULL;
 231
 232   probe.key = key;
 233   result = hash_lookup (muscle_table, &probe);
 234   if (result)
 235     return result->value;
 236   return NULL;
 237 }
 238
 239
 240 /*----------------------------------------------------------------------------.
 241 | Find the value of muscle KEY.  Abort if muscle_insert was invoked more      |
 242 | recently than muscle_grow for KEY since muscle_find can't return a          |
 243 | char const *.                                                               |
 244 `----------------------------------------------------------------------------*/
 245
 246 char *
 247 muscle_find (char const *key)
 248 {
 249   muscle_entry probe;
 250   muscle_entry *result = NULL;
 251
 252   probe.key = key;
 253   result = hash_lookup (muscle_table, &probe);
 254   if (result)
 255     {
 256       aver (result->value == result->storage);
 257       return result->storage;
 258     }
 259   return NULL;
 260 }
 261
 262
 263 void
 264 muscle_boundary_grow (char const *key, boundary bound)
 265 {
 266   char *extension;
 267   MUSCLE_OBSTACK_SGROW (&muscle_obstack, bound.file);
 268   obstack_1grow (&muscle_obstack, ':');
 269   obstack_fgrow1 (&muscle_obstack, "%d", bound.line);
 270   obstack_1grow (&muscle_obstack, '.');
 271   obstack_fgrow1 (&muscle_obstack, "%d", bound.column);
 272   obstack_1grow (&muscle_obstack, '\0');
 273   extension = obstack_finish (&muscle_obstack);
 274   muscle_grow (key, extension, "");
 275   obstack_free (&muscle_obstack, extension);
 276 }
 277
 278 void
 279 muscle_location_grow (char const *key, location loc)
 280 {
 281   muscle_grow (key, "[[", "");
 282   muscle_boundary_grow (key, loc.start);
 283   muscle_grow (key, "]], [[", "");
 284   muscle_boundary_grow (key, loc.end);
 285   muscle_grow (key, "]]", "");
 286 }
 287
 288 #define MUSCLE_COMMON_DECODE(Value)                                           \
 289   case '$':                                                                   \
 290     aver (*++(Value) == ']');                                                 \
 291     aver (*++(Value) == '[');                                                 \
 292     obstack_sgrow (&muscle_obstack, "$");                                     \
 293     break;                                                                    \
 294   case '@':                                                                   \
 295     switch (*++(Value))                                                       \
 296       {                                                                       \
 297         case '@': obstack_sgrow (&muscle_obstack, "@" ); break;               \
 298         case '{': obstack_sgrow (&muscle_obstack, "[" ); break;               \
 299         case '}': obstack_sgrow (&muscle_obstack, "]" ); break;               \
 300         default: aver (false); break;                                         \
 301       }                                                                       \
 302     break;                                                                    \
 303   default:                                                                    \
 304     obstack_1grow (&muscle_obstack, *(Value));                                \
 305     break;
 306
 307 /* Reverse of MUSCLE_OBSTACK_SGROW.  */
 308 static char *
 309 muscle_string_decode (char const *key)
 310 {
 311   char const *value;
 312   char *value_decoded;
 313   char *result;
 314
 315   value = muscle_find_const (key);
 316   if (!value)
 317     return NULL;
 318   do {
 319     switch (*value)
 320       {
 321         MUSCLE_COMMON_DECODE (value)
 322         case '[':
 323         case ']':
 324           aver (false);
 325           break;
 326       }
 327   } while (*value++);
 328   value_decoded = obstack_finish (&muscle_obstack);
 329   result = xstrdup (value_decoded);
 330   obstack_free (&muscle_obstack, value_decoded);
 331   return result;
 332 }
 333
 334 /* Reverse of muscle_location_grow.  */
 335 static location
 336 muscle_location_decode (char const *key)
 337 {
 338   location loc;
 339   char const *value = muscle_find_const (key);
 340   aver (value);
 341   aver (*value == '[');
 342   aver (*++value == '[');
 343   while (*++value)
 344     switch (*value)
 345       {
 346         MUSCLE_COMMON_DECODE (value)
 347         case '[':
 348           aver (false);
 349           break;
 350         case ']':
 351           {
 352             char *boundary_str;
 353             aver (*++value == ']');
 354             obstack_1grow (&muscle_obstack, '\0');
 355             boundary_str = obstack_finish (&muscle_obstack);
 356             switch (*++value)
 357               {
 358                 case ',':
 359                   boundary_set_from_string (&loc.start, boundary_str);
 360                   obstack_free (&muscle_obstack, boundary_str);
 361                   aver (*++value == ' ');
 362                   aver (*++value == '[');
 363                   aver (*++value == '[');
 364                   break;
 365                 case '\0':
 366                   boundary_set_from_string (&loc.end, boundary_str);
 367                   obstack_free (&muscle_obstack, boundary_str);
 368                   return loc;
 369                   break;
 370                 default:
 371                   aver (false);
 372                   break;
 373               }
 374           }
 375           break;
 376       }
 377   aver (false);
 378   return loc;
 379 }
 380
 381 void
 382 muscle_user_name_list_grow (char const *key, char const *user_name,
 383                             location loc)
 384 {
 385   muscle_grow (key, "[[[[", ",");
 386   muscle_grow (key, user_name, "");
 387   muscle_grow (key, "]], ", "");
 388   muscle_location_grow (key, loc);
 389   muscle_grow (key, "]]", "");
 390 }
 391
 392 #define MUSCLE_USER_NAME_CONVERT(NAME, PREFIX, USER_NAME, SUFFIX)    \
 393 do {                                                                 \
 394   char *tmp;                                                         \
 395   size_t length = strlen ((USER_NAME));                              \
 396   tmp = xmalloc (sizeof (PREFIX) - 1 + length + sizeof (SUFFIX));    \
 397   strcpy (tmp, (PREFIX));                                            \
 398   strcpy (tmp + sizeof (PREFIX) - 1, (USER_NAME));                   \
 399   strcpy (tmp + sizeof (PREFIX) - 1 + length, (SUFFIX));             \
 400   (NAME) = uniqstr_new (tmp);                                        \
 401   free (tmp);                                                        \
 402 } while (0)
 403
 404 void
 405 muscle_percent_define_insert (char const *variable, location variable_loc,
 406                               char const *value)
 407 {
 408   char const *name;
 409   char const *loc_name;
 410   char const *syncline_name;
 411
 412   MUSCLE_USER_NAME_CONVERT (name, "percent_define(", variable, ")");
 413   MUSCLE_USER_NAME_CONVERT (loc_name, "percent_define_loc(", variable, ")");
 414   MUSCLE_USER_NAME_CONVERT (syncline_name,
 415                             "percent_define_syncline(", variable, ")");
 416
 417   if (muscle_find_const (name))
 418     {
 419       warn_at (variable_loc, _("%s `%s' redefined"),
 420                "%define variable", variable);
 421       warn_at (muscle_percent_define_get_loc (variable),
 422                _("previous definition"));
 423     }
 424   MUSCLE_INSERT_STRING (name, value);
 425
 426   muscle_insert (loc_name, "");
 427   muscle_location_grow (loc_name, variable_loc);
 428   muscle_insert (syncline_name, "");
 429   muscle_syncline_grow (syncline_name, variable_loc);
 430   muscle_user_name_list_grow ("percent_define_user_variables", variable,
 431                               variable_loc);
 432 }
 433
 434 char *
 435 muscle_percent_define_get (char const *variable)
 436 {
 437   char const *name;
 438   char const *usage_name;
 439   char *value;
 440
 441   MUSCLE_USER_NAME_CONVERT (name, "percent_define(", variable, ")");
 442   MUSCLE_USER_NAME_CONVERT (usage_name, "percent_define_bison_variables(",
 443                             variable, ")");
 444
 445   muscle_insert (usage_name, "");
 446   value = muscle_string_decode (name);
 447   if (!value)
 448     value = xstrdup ("");
 449   return value;
 450 }
 451
 452 location
 453 muscle_percent_define_get_loc (char const *variable)
 454 {
 455   char const *loc_name;
 456   MUSCLE_USER_NAME_CONVERT (loc_name, "percent_define_loc(", variable, ")");
 457   if (!muscle_find_const (loc_name))
 458     fatal(_("undefined %%define variable `%s' passed to muscle_percent_define_get_loc"),
 459           variable);
 460   return muscle_location_decode (loc_name);
 461 }
 462
 463 char const *
 464 muscle_percent_define_get_syncline (char const *variable)
 465 {
 466   char const *syncline_name;
 467   char const *syncline;
 468   MUSCLE_USER_NAME_CONVERT (syncline_name,
 469                             "percent_define_syncline(", variable, ")");
 470   syncline = muscle_find_const (syncline_name);
 471   if (!syncline)
 472     fatal(_("undefined %%define variable `%s' passed to muscle_percent_define_get_syncline"),
 473           variable);
 474   return syncline;
 475 }
 476
 477 bool
 478 muscle_percent_define_ifdef (char const *variable)
 479 {
 480   char const *name;
 481   char const *usage_name;
 482   char const *value;
 483
 484   MUSCLE_USER_NAME_CONVERT (name, "percent_define(", variable, ")");
 485   MUSCLE_USER_NAME_CONVERT (usage_name, "percent_define_bison_variables(",
 486                             variable, ")");
 487
 488   value = muscle_find_const (name);
 489   if (value)
 490     {
 491       muscle_insert (usage_name, "");
 492       return true;
 493     }
 494
 495   return false;
 496 }
 497
 498 bool
 499 muscle_percent_define_flag_if (char const *variable)
 500 {
 501   char const *invalid_boolean_name;
 502   bool result = false;
 503
 504   MUSCLE_USER_NAME_CONVERT (invalid_boolean_name,
 505                             "percent_define_invalid_boolean(", variable, ")");
 506
 507   if (muscle_percent_define_ifdef (variable))
 508     {
 509       char *value = muscle_percent_define_get (variable);
 510       if (value[0] == '\0' || 0 == strcmp (value, "true"))
 511         result = true;
 512       else if (0 == strcmp (value, "false"))
 513         result = false;
 514       else if (!muscle_find_const (invalid_boolean_name))
 515         {
 516           muscle_insert (invalid_boolean_name, "");
 517           complain_at(muscle_percent_define_get_loc (variable),
 518                       _("invalid value for %%define Boolean variable `%s'"),
 519                       variable);
 520         }
 521       free (value);
 522     }
 523   else
 524     fatal(_("undefined %%define variable `%s' passed to muscle_percent_define_flag_if"),
 525           variable);
 526
 527   return result;
 528 }
 529
 530 void
 531 muscle_percent_define_default (char const *variable, char const *value)
 532 {
 533   char const *name;
 534   char const *loc_name;
 535   char const *syncline_name;
 536   MUSCLE_USER_NAME_CONVERT (name, "percent_define(", variable, ")");
 537   MUSCLE_USER_NAME_CONVERT (loc_name, "percent_define_loc(", variable, ")");
 538   MUSCLE_USER_NAME_CONVERT (syncline_name,
 539                             "percent_define_syncline(", variable, ")");
 540   if (!muscle_find_const (name))
 541     {
 542       location loc;
 543       MUSCLE_INSERT_STRING (name, value);
 544       loc.start.file = loc.end.file = "<default value>";
 545       loc.start.line = loc.end.line = -1;
 546       loc.start.column = loc.end.column = -1;
 547       muscle_insert (loc_name, "");
 548       muscle_location_grow (loc_name, loc);
 549       muscle_insert (syncline_name, "");
 550     }
 551 }
 552
 553 void
 554 muscle_percent_define_check_values (char const * const *values)
 555 {
 556   for (; *values; ++values)
 557     {
 558       char const *variable = *values;
 559       char const *name;
 560       char *value;
 561
 562       MUSCLE_USER_NAME_CONVERT (name, "percent_define(", variable, ")");
 563
 564       value = muscle_string_decode (name);
 565       if (value)
 566         {
 567           bool valid = false;
 568           for (++values; *values; ++values)
 569             {
 570               if (0 == strcmp (value, *values))
 571                 {
 572                   valid = true;
 573                   while (*values)
 574                     ++values;
 575                   break;
 576                 }
 577             }
 578           if (!valid)
 579             complain_at(muscle_percent_define_get_loc (variable),
 580                         _("invalid value for %%define variable `%s': `%s'"),
 581                         variable, value);
 582           free (value);
 583         }
 584       else
 585         fatal(_("undefined %%define variable `%s' passed to muscle_percent_define_check_values"),
 586               variable);
 587     }
 588 }
 589
 590 void
 591 muscle_percent_code_grow (char const *qualifier, location qualifier_loc,
 592                           char const *code, location code_loc)
 593 {
 594   char const *name;
 595   MUSCLE_USER_NAME_CONVERT (name, "percent_code(", qualifier, ")");
 596   muscle_code_grow (name, code, code_loc);
 597   muscle_user_name_list_grow ("percent_code_user_qualifiers", qualifier,
 598                                qualifier_loc);
 599 }
 600
 601
 602 /*------------------------------------------------.
 603 | Output the definition of ENTRY as a m4_define.  |
 604 `------------------------------------------------*/
 605
 606 static inline bool
 607 muscle_m4_output (muscle_entry *entry, FILE *out)
 608 {
 609   fprintf (out, "m4_define([b4_%s],\n", entry->key);
 610   fprintf (out, "[[%s]])\n\n\n", entry->value);
 611   return true;
 612 }
 613
 614 static bool
 615 muscle_m4_output_processor (void *entry, void *out)
 616 {
 617   return muscle_m4_output (entry, out);
 618 }
 619
 620
 621 /*----------------------------------------------------------------.
 622 | Output the definition of all the current muscles into a list of |
 623 | m4_defines.                                                     |
 624 `----------------------------------------------------------------*/
 625
 626 void
 627 muscles_m4_output (FILE *out)
 628 {
 629   hash_do_for_each (muscle_table, muscle_m4_output_processor, out);
 630 }