src/muscle-tab.c

   1 /* Muscle table manager for Bison.
   2
   3    Copyright (C) 2001-2012 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
  25 #include "complain.h"
  26 #include "files.h"
  27 #include "getargs.h"
  28 #include "muscle-tab.h"
  29 #include "quote.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 STREQ (m1->key, m2->key);
  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 }
  88
  89
  90 /*------------------------------------------------------------.
  91 | Free all the memory consumed by the muscle machinery only.  |
  92 `------------------------------------------------------------*/
  93
  94 void
  95 muscle_free (void)
  96 {
  97   hash_free (muscle_table);
  98   obstack_free (&muscle_obstack, NULL);
  99 }
 100
 101
 102
 103 /*------------------------------------------------------------.
 104 | Insert (KEY, VALUE).  If KEY already existed, overwrite the |
 105 | previous value.                                             |
 106 `------------------------------------------------------------*/
 107
 108 void
 109 muscle_insert (char const *key, char const *value)
 110 {
 111   muscle_entry probe;
 112   muscle_entry *entry;
 113
 114   probe.key = key;
 115   entry = hash_lookup (muscle_table, &probe);
 116
 117   if (!entry)
 118     {
 119       /* First insertion in the hash. */
 120       entry = xmalloc (sizeof *entry);
 121       entry->key = key;
 122       if (!hash_insert (muscle_table, entry))
 123         xalloc_die ();
 124     }
 125   else
 126     free (entry->storage);
 127   entry->value = value;
 128   entry->storage = NULL;
 129 }
 130
 131
 132 /*-------------------------------------------------------------------.
 133 | Append VALUE to the current value of KEY.  If KEY did not already  |
 134 | exist, create it.  Use MUSCLE_OBSTACK.  De-allocate the previously |
 135 | associated value.  Copy VALUE and SEPARATOR.                       |
 136 `-------------------------------------------------------------------*/
 137
 138 void
 139 muscle_grow (const char *key, const char *val, const char *separator)
 140 {
 141   muscle_entry probe;
 142   muscle_entry *entry = NULL;
 143
 144   probe.key = key;
 145   entry = hash_lookup (muscle_table, &probe);
 146
 147   if (!entry)
 148     {
 149       /* First insertion in the hash. */
 150       entry = xmalloc (sizeof *entry);
 151       entry->key = key;
 152       if (!hash_insert (muscle_table, entry))
 153         xalloc_die ();
 154       entry->value = entry->storage = xstrdup (val);
 155     }
 156   else
 157     {
 158       /* Grow the current value. */
 159       char *new_val;
 160       obstack_sgrow (&muscle_obstack, entry->value);
 161       free (entry->storage);
 162       obstack_sgrow (&muscle_obstack, separator);
 163       obstack_sgrow (&muscle_obstack, val);
 164       obstack_1grow (&muscle_obstack, 0);
 165       new_val = obstack_finish (&muscle_obstack);
 166       entry->value = entry->storage = xstrdup (new_val);
 167       obstack_free (&muscle_obstack, new_val);
 168     }
 169 }
 170
 171 /*------------------------------------------------------------------.
 172 | Using muscle_grow, append a synchronization line for the location |
 173 | LOC to the current value of KEY.                                  |
 174 `------------------------------------------------------------------*/
 175
 176 static void
 177 muscle_syncline_grow (char const *key, location loc)
 178 {
 179   char *extension = NULL;
 180   obstack_fgrow1 (&muscle_obstack, "]b4_syncline(%d, [[", loc.start.line);
 181   MUSCLE_OBSTACK_SGROW (&muscle_obstack,
 182                         quotearg_style (c_quoting_style, loc.start.file));
 183   obstack_sgrow (&muscle_obstack, "]])[");
 184   obstack_1grow (&muscle_obstack, 0);
 185   extension = obstack_finish (&muscle_obstack);
 186   muscle_grow (key, extension, "");
 187   obstack_free (&muscle_obstack, extension);
 188 }
 189
 190 /*------------------------------------------------------------------.
 191 | Append VALUE to the current value of KEY, using muscle_grow.  But |
 192 | in addition, issue a synchronization line for the location LOC    |
 193 | using muscle_syncline_grow.                                       |
 194 `------------------------------------------------------------------*/
 195
 196 void
 197 muscle_code_grow (const char *key, const char *val, location loc)
 198 {
 199   muscle_syncline_grow (key, loc);
 200   muscle_grow (key, val, "\n");
 201 }
 202
 203
 204 void muscle_pair_list_grow (const char *muscle,
 205                             const char *a1, const char *a2)
 206 {
 207   char *pair;
 208   obstack_sgrow (&muscle_obstack, "[[[");
 209   MUSCLE_OBSTACK_SGROW (&muscle_obstack, a1);
 210   obstack_sgrow (&muscle_obstack, "]], [[");
 211   MUSCLE_OBSTACK_SGROW (&muscle_obstack, a2);
 212   obstack_sgrow (&muscle_obstack, "]]]");
 213   obstack_1grow (&muscle_obstack, 0);
 214   pair = obstack_finish (&muscle_obstack);
 215   muscle_grow (muscle, pair, ",\n");
 216   obstack_free (&muscle_obstack, pair);
 217 }
 218
 219
 220 /*----------------------------------------------------------------------------.
 221 | Find the value of muscle KEY.  Unlike MUSCLE_FIND, this is always reliable  |
 222 | to determine whether KEY has a value.                                       |
 223 `----------------------------------------------------------------------------*/
 224
 225 char const *
 226 muscle_find_const (char const *key)
 227 {
 228   muscle_entry probe;
 229   muscle_entry *result = NULL;
 230
 231   probe.key = key;
 232   result = hash_lookup (muscle_table, &probe);
 233   if (result)
 234     return result->value;
 235   return NULL;
 236 }
 237
 238
 239 /*----------------------------------------------------------------------------.
 240 | Find the value of muscle KEY.  Abort if muscle_insert was invoked more      |
 241 | recently than muscle_grow for KEY since muscle_find can't return a          |
 242 | char const *.                                                               |
 243 `----------------------------------------------------------------------------*/
 244
 245 char *
 246 muscle_find (char const *key)
 247 {
 248   muscle_entry probe;
 249   muscle_entry *result = NULL;
 250
 251   probe.key = key;
 252   result = hash_lookup (muscle_table, &probe);
 253   if (result)
 254     {
 255       aver (result->value == result->storage);
 256       return result->storage;
 257     }
 258   return NULL;
 259 }
 260
 261
 262 void
 263 muscle_boundary_grow (char const *key, boundary bound)
 264 {
 265   char *extension;
 266   MUSCLE_OBSTACK_SGROW (&muscle_obstack, bound.file);
 267   obstack_1grow (&muscle_obstack, ':');
 268   obstack_fgrow1 (&muscle_obstack, "%d", bound.line);
 269   obstack_1grow (&muscle_obstack, '.');
 270   obstack_fgrow1 (&muscle_obstack, "%d", bound.column);
 271   obstack_1grow (&muscle_obstack, '\0');
 272   extension = obstack_finish (&muscle_obstack);
 273   muscle_grow (key, extension, "");
 274   obstack_free (&muscle_obstack, extension);
 275 }
 276
 277 void
 278 muscle_location_grow (char const *key, location loc)
 279 {
 280   muscle_grow (key, "[[", "");
 281   muscle_boundary_grow (key, loc.start);
 282   muscle_grow (key, "]], [[", "");
 283   muscle_boundary_grow (key, loc.end);
 284   muscle_grow (key, "]]", "");
 285 }
 286
 287 #define MUSCLE_COMMON_DECODE(Value)                                           \
 288   case '$':                                                                   \
 289     aver (*++(Value) == ']');                                                 \
 290     aver (*++(Value) == '[');                                                 \
 291     obstack_sgrow (&muscle_obstack, "$");                                     \
 292     break;                                                                    \
 293   case '@':                                                                   \
 294     switch (*++(Value))                                                       \
 295       {                                                                       \
 296         case '@': obstack_sgrow (&muscle_obstack, "@" ); break;               \
 297         case '{': obstack_sgrow (&muscle_obstack, "[" ); break;               \
 298         case '}': obstack_sgrow (&muscle_obstack, "]" ); break;               \
 299         default: aver (false); break;                                         \
 300       }                                                                       \
 301     break;                                                                    \
 302   default:                                                                    \
 303     obstack_1grow (&muscle_obstack, *(Value));                                \
 304     break;
 305
 306 /* Reverse of MUSCLE_OBSTACK_SGROW.  */
 307 static char *
 308 muscle_string_decode (char const *key)
 309 {
 310   char const *value;
 311   char *value_decoded;
 312   char *result;
 313
 314   value = muscle_find_const (key);
 315   if (!value)
 316     return NULL;
 317   do {
 318     switch (*value)
 319       {
 320         MUSCLE_COMMON_DECODE (value)
 321         case '[':
 322         case ']':
 323           aver (false);
 324           break;
 325       }
 326   } while (*value++);
 327   value_decoded = obstack_finish (&muscle_obstack);
 328   result = xstrdup (value_decoded);
 329   obstack_free (&muscle_obstack, value_decoded);
 330   return result;
 331 }
 332
 333 /* Reverse of muscle_location_grow.  */
 334 static location
 335 muscle_location_decode (char const *key)
 336 {
 337   location loc;
 338   char const *value = muscle_find_const (key);
 339   aver (value);
 340   aver (*value == '[');
 341   aver (*++value == '[');
 342   while (*++value)
 343     switch (*value)
 344       {
 345         MUSCLE_COMMON_DECODE (value)
 346         case '[':
 347           aver (false);
 348           break;
 349         case ']':
 350           {
 351             char *boundary_str;
 352             aver (*++value == ']');
 353             obstack_1grow (&muscle_obstack, '\0');
 354             boundary_str = obstack_finish (&muscle_obstack);
 355             switch (*++value)
 356               {
 357                 case ',':
 358                   boundary_set_from_string (&loc.start, boundary_str);
 359                   obstack_free (&muscle_obstack, boundary_str);
 360                   aver (*++value == ' ');
 361                   aver (*++value == '[');
 362                   aver (*++value == '[');
 363                   break;
 364                 case '\0':
 365                   boundary_set_from_string (&loc.end, boundary_str);
 366                   obstack_free (&muscle_obstack, boundary_str);
 367                   return loc;
 368                   break;
 369                 default:
 370                   aver (false);
 371                   break;
 372               }
 373           }
 374           break;
 375       }
 376   aver (false);
 377   return loc;
 378 }
 379
 380 void
 381 muscle_user_name_list_grow (char const *key, char const *user_name,
 382                             location loc)
 383 {
 384   muscle_grow (key, "[[[[", ",");
 385   muscle_grow (key, user_name, "");
 386   muscle_grow (key, "]], ", "");
 387   muscle_location_grow (key, loc);
 388   muscle_grow (key, "]]", "");
 389 }
 390
 391 /** If the \a variable name is obsolete, return the name to use,
 392  * otherwise \a variable. */
 393 static
 394 char const *
 395 muscle_percent_variable_update (char const *variable)
 396 {
 397   typedef struct
 398   {
 399     const char *obsolete;
 400     const char *updated;
 401   } conversion_type;
 402   const conversion_type conversion[] =
 403     {
 404       { "api.push_pull", "api.push-pull", },
 405       { "lr.keep_unreachable_states", "lr.keep-unreachable-states", },
 406       { "namespace", "api.namespace", },
 407     };
 408   int i;
 409   for (i = 0; i < sizeof conversion / sizeof *conversion; ++i)
 410     if (STREQ (conversion[i].obsolete, variable))
 411       return conversion[i].updated;
 412   return variable;
 413 }
 414
 415 void
 416 muscle_percent_define_insert (char const *variable, location variable_loc,
 417                               char const *value,
 418                               muscle_percent_define_how how)
 419 {
 420   char const *name;
 421   char const *loc_name;
 422   char const *syncline_name;
 423   char const *how_name;
 424
 425   /* Permit certain names with underscores for backward compatibility.  */
 426   variable = muscle_percent_variable_update (variable);
 427
 428   name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
 429   loc_name = UNIQSTR_CONCAT ("percent_define_loc(", variable, ")");
 430   syncline_name =
 431     UNIQSTR_CONCAT ("percent_define_syncline(", variable, ")");
 432   how_name = UNIQSTR_CONCAT ("percent_define_how(", variable, ")");
 433
 434   /* Command-line options are processed before the grammar file.  */
 435   if (how == MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE
 436       && muscle_find_const (name))
 437     {
 438       muscle_percent_define_how how_old =
 439         atoi (muscle_find_const (how_name));
 440       if (how_old == MUSCLE_PERCENT_DEFINE_F)
 441         return;
 442       complain_at (variable_loc, _("%%define variable %s redefined"),
 443                    quote (variable));
 444       complain_at (muscle_percent_define_get_loc (variable),
 445                    _("previous definition"));
 446     }
 447
 448   MUSCLE_INSERT_STRING (name, value);
 449   muscle_insert (loc_name, "");
 450   muscle_location_grow (loc_name, variable_loc);
 451   muscle_insert (syncline_name, "");
 452   muscle_syncline_grow (syncline_name, variable_loc);
 453   muscle_user_name_list_grow ("percent_define_user_variables", variable,
 454                               variable_loc);
 455   MUSCLE_INSERT_INT (how_name, how);
 456 }
 457
 458 /* This is used for backward compatibility, e.g., "%define api.pure"
 459    supersedes "%pure-parser".  */
 460 void
 461 muscle_percent_define_ensure (char const *variable, location loc,
 462                               bool value)
 463 {
 464   char const *val = value ? "" : "false";
 465   char const *name;
 466   name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
 467
 468   /* %pure-parser is deprecated in favor of `%define api.pure', so use
 469      `%define api.pure' in a backward-compatible manner here.  First,
 470      don't complain if %pure-parser is specified multiple times.  */
 471   if (!muscle_find_const (name))
 472     muscle_percent_define_insert (variable, loc, val,
 473                                   MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
 474   /* In all cases, use api.pure now so that the backend doesn't complain if
 475      the skeleton ignores api.pure, but do warn now if there's a previous
 476      conflicting definition from an actual %define.  */
 477   if (muscle_percent_define_flag_if (variable) != value)
 478     muscle_percent_define_insert (variable, loc, val,
 479                                   MUSCLE_PERCENT_DEFINE_GRAMMAR_FILE);
 480 }
 481
 482 char *
 483 muscle_percent_define_get (char const *variable)
 484 {
 485   char const *name;
 486   char const *usage_name;
 487   char *value;
 488
 489   name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
 490   usage_name = UNIQSTR_CONCAT ("percent_define_bison_variables(",
 491                                variable, ")");
 492
 493   muscle_insert (usage_name, "");
 494   value = muscle_string_decode (name);
 495   if (!value)
 496     value = xstrdup ("");
 497   return value;
 498 }
 499
 500 location
 501 muscle_percent_define_get_loc (char const *variable)
 502 {
 503   char const *loc_name;
 504   loc_name = UNIQSTR_CONCAT ("percent_define_loc(", variable, ")");
 505   if (!muscle_find_const (loc_name))
 506     fatal(_("%s: undefined %%define variable %s"),
 507           "muscle_percent_define_get_loc", quote (variable));
 508   return muscle_location_decode (loc_name);
 509 }
 510
 511 char const *
 512 muscle_percent_define_get_syncline (char const *variable)
 513 {
 514   char const *syncline_name;
 515   char const *syncline;
 516   syncline_name =
 517     UNIQSTR_CONCAT ("percent_define_syncline(", variable, ")");
 518   syncline = muscle_find_const (syncline_name);
 519   if (!syncline)
 520     fatal(_("%s: undefined %%define variable %s"),
 521           "muscle_percent_define_get_syncline", quote (variable));
 522   return syncline;
 523 }
 524
 525 bool
 526 muscle_percent_define_ifdef (char const *variable)
 527 {
 528   char const *name;
 529   char const *usage_name;
 530   char const *value;
 531
 532   name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
 533   usage_name =
 534     UNIQSTR_CONCAT ("percent_define_bison_variables(", variable, ")");
 535
 536   value = muscle_find_const (name);
 537   if (value)
 538     {
 539       muscle_insert (usage_name, "");
 540       return true;
 541     }
 542
 543   return false;
 544 }
 545
 546 bool
 547 muscle_percent_define_flag_if (char const *variable)
 548 {
 549   char const *invalid_boolean_name;
 550   bool result = false;
 551
 552   invalid_boolean_name =
 553     UNIQSTR_CONCAT ("percent_define_invalid_boolean(", variable, ")");
 554
 555   if (muscle_percent_define_ifdef (variable))
 556     {
 557       char *value = muscle_percent_define_get (variable);
 558       if (value[0] == '\0' || STREQ (value, "true"))
 559         result = true;
 560       else if (STREQ (value, "false"))
 561         result = false;
 562       else if (!muscle_find_const (invalid_boolean_name))
 563         {
 564           muscle_insert (invalid_boolean_name, "");
 565           complain_at(muscle_percent_define_get_loc (variable),
 566                       _("invalid value for %%define Boolean variable %s"),
 567                       quote (variable));
 568         }
 569       free (value);
 570     }
 571   else
 572     fatal(_("%s: undefined %%define variable %s"),
 573           "muscle_percent_define_flag", quote (variable));
 574
 575   return result;
 576 }
 577
 578 void
 579 muscle_percent_define_default (char const *variable, char const *value)
 580 {
 581   char const *name;
 582   char const *loc_name;
 583   char const *syncline_name;
 584   name = UNIQSTR_CONCAT ("percent_define(", variable, ")");
 585   loc_name = UNIQSTR_CONCAT ("percent_define_loc(", variable, ")");
 586   syncline_name =
 587     UNIQSTR_CONCAT ("percent_define_syncline(", variable, ")");
 588   if (!muscle_find_const (name))
 589     {
 590       location loc;
 591       MUSCLE_INSERT_STRING (name, value);
 592       loc.start.file = loc.end.file = "<default value>";
 593       loc.start.line = loc.end.line = -1;
 594       loc.start.column = loc.end.column = -1;
 595       muscle_insert (loc_name, "");
 596       muscle_location_grow (loc_name, loc);
 597       muscle_insert (syncline_name, "");
 598     }
 599 }
 600
 601 void
 602 muscle_percent_define_check_values (char const * const *values)
 603 {
 604   for (; *values; ++values)
 605     {
 606       char const * const *variablep = values;
 607       char const *name;
 608       char *value;
 609
 610       name = UNIQSTR_CONCAT ("percent_define(", *variablep, ")");
 611
 612       value = muscle_string_decode (name);
 613       if (value)
 614         {
 615           for (++values; *values; ++values)
 616             {
 617               if (STREQ (value, *values))
 618                 break;
 619             }
 620           if (!*values)
 621             {
 622               location loc = muscle_percent_define_get_loc (*variablep);
 623               complain_at(loc,
 624                           _("invalid value for %%define variable %s: %s"),
 625                           quote (*variablep), quote_n (1, value));
 626               for (values = variablep + 1; *values; ++values)
 627                 complain_at (loc, _("accepted value: %s"), quote (*values));
 628             }
 629           else
 630             {
 631               while (*values)
 632                 ++values;
 633             }
 634           free (value);
 635         }
 636       else
 637         fatal (_("%s: undefined %%define variable %s"),
 638                "muscle_percent_define_check_values", quote (*variablep));
 639     }
 640 }
 641
 642 void
 643 muscle_percent_code_grow (char const *qualifier, location qualifier_loc,
 644                           char const *code, location code_loc)
 645 {
 646   char const *name;
 647   name = UNIQSTR_CONCAT ("percent_code(", qualifier, ")");
 648   muscle_code_grow (name, code, code_loc);
 649   muscle_user_name_list_grow ("percent_code_user_qualifiers", qualifier,
 650                                qualifier_loc);
 651 }
 652
 653
 654 /*------------------------------------------------.
 655 | Output the definition of ENTRY as a m4_define.  |
 656 `------------------------------------------------*/
 657
 658 static inline bool
 659 muscle_m4_output (muscle_entry *entry, FILE *out)
 660 {
 661   fprintf (out, "m4_define([b4_%s],\n", entry->key);
 662   fprintf (out, "[[%s]])\n\n\n", entry->value);
 663   return true;
 664 }
 665
 666 static bool
 667 muscle_m4_output_processor (void *entry, void *out)
 668 {
 669   return muscle_m4_output (entry, out);
 670 }
 671
 672
 673 /*----------------------------------------------------------------.
 674 | Output the definition of all the current muscles into a list of |
 675 | m4_defines.                                                     |
 676 `----------------------------------------------------------------*/
 677
 678 void
 679 muscles_m4_output (FILE *out)
 680 {
 681   hash_do_for_each (muscle_table, muscle_m4_output_processor, out);
 682 }