src/muscle-tab.c

   1 /* Muscle table manager for Bison.
   2
   3    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
   4    2010 Free Software Foundation, Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   8    This program is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include <config.h>
  22 #include "system.h"
  23
  24 #include <hash.h>
  25 #include <quotearg.h>
  26
  27 #include "complain.h"
  28 #include "files.h"
  29 #include "muscle-tab.h"
  30 #include "getargs.h"
  31
  32 /* A key-value pair, along with storage that can be reclaimed when
  33    this pair is no longer needed.  */
  34 typedef struct
  35 {
  36   char const *key;
  37   char const *value;
  38   char *storage;
  39 } muscle_entry;
  40
  41 /* An obstack used to create some entries.  */
  42 struct obstack muscle_obstack;
  43
  44 /* Initial capacity of muscles hash table.  */
  45 #define HT_INITIAL_CAPACITY 257
  46
  47 static struct hash_table *muscle_table = NULL;
  48
  49 static bool
  50 hash_compare_muscles (void const *x, void const *y)
  51 {
  52   muscle_entry const *m1 = x;
  53   muscle_entry const *m2 = y;
  54   return strcmp (m1->key, m2->key) == 0;
  55 }
  56
  57 static size_t
  58 hash_muscle (const void *x, size_t tablesize)
  59 {
  60   muscle_entry const *m = x;
  61   return hash_string (m->key, tablesize);
  62 }
  63
  64 /*-----------------------------------------------------------------.
  65 | Create the MUSCLE_TABLE, and initialize it with default values.  |
  66 | Also set up the MUSCLE_OBSTACK.                                  |
  67 `-----------------------------------------------------------------*/
  68
  69 static void
  70 muscle_entry_free (void *entry)
  71 {
  72   muscle_entry *mentry = entry;
  73   free (mentry->storage);
  74   free (mentry);
  75 }
  76
  77 void
  78 muscle_init (void)
  79 {
  80   /* Initialize the muscle obstack.  */
  81   obstack_init (&muscle_obstack);
  82
  83   muscle_table = hash_initialize (HT_INITIAL_CAPACITY, NULL, hash_muscle,
  84                                   hash_compare_muscles, muscle_entry_free);
  85
  86   /* Version and input file.  */
  87   MUSCLE_INSERT_STRING ("version", VERSION);
  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 void
 393 muscle_percent_define_insert (char const *variable, location variable_loc,
 394                               char const *value,
 395                               muscle_percent_define_how how)
 396 {
 397   char *variable_tr = NULL;
 398   char const *name;
 399   char const *loc_name;
 400   char const *syncline_name;
 401   char const *how_name;
 402
 403   /* Permit certain names with underscores for backward compatibility.  */
 404   if (0 == strcmp (variable, "api.push_pull")
 405       || 0 == strcmp (variable, "lr.keep_unreachable_states"))
 406     {
 407       variable_tr = strdup (variable);
 408       tr (variable_tr, '_', '-');
 409       variable = variable_tr;
 410     }
 411
 412   name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
 413   loc_name = UNIQSTR_CONCAT ("percent_define_loc(", variable, ")");
 414   syncline_name =
 415     UNIQSTR_CONCAT ("percent_define_syncline(", variable, ")");
 416   how_name = UNIQSTR_CONCAT ("percent_define_how(", variable, ")");
 417
 418   /* Command-line options are processed before the grammar file.  */
 419   if (how == MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE
 420       && muscle_find_const (name))
 421     {
 422       muscle_percent_define_how how_old =
 423         atoi (muscle_find_const (how_name));
 424       if (how_old == MUSCLE_PERCENT_DEFINE_F)
 425         {
 426           free (variable_tr);
 427           return;
 428         }
 429       complain_at (variable_loc, _("%%define variable `%s' redefined"),
 430                    variable);
 431       complain_at (muscle_percent_define_get_loc (variable),
 432                    _("previous definition"));
 433     }
 434
 435   MUSCLE_INSERT_STRING (name, value);
 436   muscle_insert (loc_name, "");
 437   muscle_location_grow (loc_name, variable_loc);
 438   muscle_insert (syncline_name, "");
 439   muscle_syncline_grow (syncline_name, variable_loc);
 440   muscle_user_name_list_grow ("percent_define_user_variables", variable,
 441                               variable_loc);
 442   MUSCLE_INSERT_INT (how_name, how);
 443
 444   free (variable_tr);
 445 }
 446
 447 char *
 448 muscle_percent_define_get (char const *variable)
 449 {
 450   char const *name;
 451   char const *usage_name;
 452   char *value;
 453
 454   name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
 455   usage_name = UNIQSTR_CONCAT ("percent_define_bison_variables(",
 456                                variable, ")");
 457
 458   muscle_insert (usage_name, "");
 459   value = muscle_string_decode (name);
 460   if (!value)
 461     value = xstrdup ("");
 462   return value;
 463 }
 464
 465 location
 466 muscle_percent_define_get_loc (char const *variable)
 467 {
 468   char const *loc_name;
 469   loc_name = UNIQSTR_CONCAT ("percent_define_loc(", variable, ")");
 470   if (!muscle_find_const (loc_name))
 471     fatal(_("undefined %%define variable `%s' passed to"
 472             " muscle_percent_define_get_loc"), variable);
 473   return muscle_location_decode (loc_name);
 474 }
 475
 476 char const *
 477 muscle_percent_define_get_syncline (char const *variable)
 478 {
 479   char const *syncline_name;
 480   char const *syncline;
 481   syncline_name =
 482     UNIQSTR_CONCAT ("percent_define_syncline(", variable, ")");
 483   syncline = muscle_find_const (syncline_name);
 484   if (!syncline)
 485     fatal(_("undefined %%define variable `%s' passed to"
 486             " muscle_percent_define_get_syncline"), variable);
 487   return syncline;
 488 }
 489
 490 bool
 491 muscle_percent_define_ifdef (char const *variable)
 492 {
 493   char const *name;
 494   char const *usage_name;
 495   char const *value;
 496
 497   name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
 498   usage_name =
 499     UNIQSTR_CONCAT ("percent_define_bison_variables(", variable, ")");
 500
 501   value = muscle_find_const (name);
 502   if (value)
 503     {
 504       muscle_insert (usage_name, "");
 505       return true;
 506     }
 507
 508   return false;
 509 }
 510
 511 bool
 512 muscle_percent_define_flag_if (char const *variable)
 513 {
 514   char const *invalid_boolean_name;
 515   bool result = false;
 516
 517   invalid_boolean_name =
 518     UNIQSTR_CONCAT ("percent_define_invalid_boolean(", variable, ")");
 519
 520   if (muscle_percent_define_ifdef (variable))
 521     {
 522       char *value = muscle_percent_define_get (variable);
 523       if (value[0] == '\0' || 0 == strcmp (value, "true"))
 524         result = true;
 525       else if (0 == strcmp (value, "false"))
 526         result = false;
 527       else if (!muscle_find_const (invalid_boolean_name))
 528         {
 529           muscle_insert (invalid_boolean_name, "");
 530           complain_at(muscle_percent_define_get_loc (variable),
 531                       _("invalid value for %%define Boolean variable `%s'"),
 532                       variable);
 533         }
 534       free (value);
 535     }
 536   else
 537     fatal(_("undefined %%define variable `%s' passed to muscle_percent_define_flag_if"),
 538           variable);
 539
 540   return result;
 541 }
 542
 543 void
 544 muscle_percent_define_default (char const *variable, char const *value)
 545 {
 546   char const *name;
 547   char const *loc_name;
 548   char const *syncline_name;
 549   name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
 550   loc_name = UNIQSTR_CONCAT ("percent_define_loc(", variable, ")");
 551   syncline_name =
 552     UNIQSTR_CONCAT ("percent_define_syncline(", variable, ")");
 553   if (!muscle_find_const (name))
 554     {
 555       location loc;
 556       MUSCLE_INSERT_STRING (name, value);
 557       loc.start.file = loc.end.file = "<default value>";
 558       loc.start.line = loc.end.line = -1;
 559       loc.start.column = loc.end.column = -1;
 560       muscle_insert (loc_name, "");
 561       muscle_location_grow (loc_name, loc);
 562       muscle_insert (syncline_name, "");
 563     }
 564 }
 565
 566 void
 567 muscle_percent_define_check_values (char const * const *values)
 568 {
 569   for (; *values; ++values)
 570     {
 571       char const * const *variablep = values;
 572       char const *name;
 573       char *value;
 574
 575       name = UNIQSTR_CONCAT ("percent_define(", *variablep, ")");
 576
 577       value = muscle_string_decode (name);
 578       if (value)
 579         {
 580           for (++values; *values; ++values)
 581             {
 582               if (0 == strcmp (value, *values))
 583                 break;
 584             }
 585           if (!*values)
 586             {
 587               location loc = muscle_percent_define_get_loc (*variablep);
 588               complain_at(loc,
 589                           _("invalid value for %%define variable `%s': `%s'"),
 590                           *variablep, value);
 591               for (values = variablep + 1; *values; ++values)
 592                 complain_at (loc, _("accepted value: `%s'"), *values);
 593             }
 594           else
 595             {
 596               while (*values)
 597                 ++values;
 598             }
 599           free (value);
 600         }
 601       else
 602         fatal(_("undefined %%define variable `%s' passed to"
 603                 " muscle_percent_define_check_values"),
 604               *variablep);
 605     }
 606 }
 607
 608 void
 609 muscle_percent_code_grow (char const *qualifier, location qualifier_loc,
 610                           char const *code, location code_loc)
 611 {
 612   char const *name;
 613   name = UNIQSTR_CONCAT ("percent_code(", qualifier, ")");
 614   muscle_code_grow (name, code, code_loc);
 615   muscle_user_name_list_grow ("percent_code_user_qualifiers", qualifier,
 616                                qualifier_loc);
 617 }
 618
 619
 620 /*------------------------------------------------.
 621 | Output the definition of ENTRY as a m4_define.  |
 622 `------------------------------------------------*/
 623
 624 static inline bool
 625 muscle_m4_output (muscle_entry *entry, FILE *out)
 626 {
 627   fprintf (out, "m4_define([b4_%s],\n", entry->key);
 628   fprintf (out, "[[%s]])\n\n\n", entry->value);
 629   return true;
 630 }
 631
 632 static bool
 633 muscle_m4_output_processor (void *entry, void *out)
 634 {
 635   return muscle_m4_output (entry, out);
 636 }
 637
 638
 639 /*----------------------------------------------------------------.
 640 | Output the definition of all the current muscles into a list of |
 641 | m4_defines.                                                     |
 642 `----------------------------------------------------------------*/
 643
 644 void
 645 muscles_m4_output (FILE *out)
 646 {
 647   hash_do_for_each (muscle_table, muscle_m4_output_processor, out);
 648 }