tests/glr-regression.at

   1 # Checking GLR Parsing: Regression Tests           -*- Autotest -*-
   2 # Copyright (C) 2002, 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
   3
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 AT_BANNER([[GLR Regression Tests]])
  18
  19 ## --------------------------- ##
  20 ## Badly Collapsed GLR States. ##
  21 ## --------------------------- ##
  22
  23 AT_SETUP([Badly Collapsed GLR States])
  24
  25 AT_DATA_GRAMMAR([glr-regr1.y],
  26 [[/* Regression Test: Improper state compression */
  27 /* Reported by Scott McPeak */
  28
  29 %{
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32
  33 #define YYSTYPE int
  34 static YYSTYPE exprMerge (YYSTYPE x0, YYSTYPE x1);
  35 int yylex (void);
  36 void yyerror (char const *msg);
  37 %}
  38
  39
  40 %glr-parser
  41
  42
  43 /* -------- productions ------ */
  44 %%
  45
  46 StartSymbol: E  { $$=0; }                   %merge <exprMerge>
  47            ;
  48
  49 E: E 'P' E { $$=1; printf("E -> E 'P' E\n"); }  %merge <exprMerge>
  50  | 'B'     { $$=2; printf("E -> 'B'\n"); }      %merge <exprMerge>
  51  ;
  52
  53
  54
  55 /* ---------- C code ----------- */
  56 %%
  57
  58 static YYSTYPE exprMerge (YYSTYPE x0, YYSTYPE x1)
  59 {
  60   (void) x0;
  61   (void) x1;
  62   printf ("<OR>\n");
  63   return 0;
  64 }
  65
  66 int
  67 main (void)
  68 {
  69   return yyparse ();
  70 }
  71
  72 void
  73 yyerror (char const *msg)
  74 {
  75   fprintf (stderr, "%s\n", msg);
  76 }
  77
  78
  79 int
  80 yylex (void)
  81 {
  82   for (;;)
  83     {
  84       int ch;
  85       if (feof (stdin))
  86         abort ();
  87       ch = getchar ();
  88       if (ch == EOF)
  89         return 0;
  90       else if (ch == 'B' || ch == 'P')
  91         return ch;
  92     }
  93 }
  94 ]])
  95
  96 AT_BISON_CHECK([[-o glr-regr1.c glr-regr1.y]], 0, [],
  97 [glr-regr1.y: conflicts: 1 shift/reduce
  98 ])
  99 AT_COMPILE([glr-regr1])
 100 AT_PARSER_CHECK([[echo BPBPB | ./glr-regr1]], 0,
 101 [[E -> 'B'
 102 E -> 'B'
 103 E -> E 'P' E
 104 E -> 'B'
 105 E -> E 'P' E
 106 E -> 'B'
 107 E -> E 'P' E
 108 E -> E 'P' E
 109 <OR>
 110 ]], [])
 111
 112 AT_CLEANUP
 113
 114 ## ------------------------------------------------------------ ##
 115 ## Improper handling of embedded actions and $-N in GLR parsers ##
 116 ## ------------------------------------------------------------ ##
 117
 118 AT_SETUP([Improper handling of embedded actions and dollar(-N) in GLR parsers])
 119
 120 AT_DATA_GRAMMAR([glr-regr2a.y],
 121 [[/* Regression Test: Improper handling of embedded actions and $-N  */
 122 /* Reported by S. Eken */
 123
 124 %{
 125   #define YYSTYPE char *
 126
 127   #include <ctype.h>
 128   #include <stdio.h>
 129   #include <stdlib.h>
 130   #include <string.h>
 131   int yylex (void);
 132   void yyerror (char const *);
 133 %}
 134
 135 %glr-parser
 136
 137 %%
 138
 139 command:
 140     's' var 't'
 141        { printf ("Variable: '%s'\n", $2); }
 142     'v' 'x' 'q'
 143        { free ($2); }
 144   | 's' var_list 't' 'e'
 145        { printf ("Varlist: '%s'\n", $2); free ($2); }
 146   | 's' var 't' var_printer 'x'
 147        { free ($2); }
 148   ;
 149
 150 var:
 151   'V'
 152      { $$ = $1; }
 153   ;
 154
 155 var_list:
 156   var
 157     { $$ = $1; }
 158   | var ',' var_list
 159     {
 160       char *s = (char *) realloc ($1, strlen ($1) + 1 + strlen ($3) + 1);
 161       strcat (s, ",");
 162       strcat (s, $3);
 163       free ($3);
 164       $$ = s;
 165     }
 166   ;
 167
 168 var_printer: 'v'
 169    { printf ("Variable: '%s'\n", $-1); }
 170
 171 %%
 172
 173 FILE *input;
 174
 175 int
 176 yylex (void)
 177 {
 178   char buf[50];
 179   char *s;
 180   if (feof (stdin))
 181     abort ();
 182   switch (fscanf (input, " %1[a-z,]", buf)) {
 183   case 1:
 184     return buf[0];
 185   case EOF:
 186     return 0;
 187   default:
 188     break;
 189   }
 190   if (fscanf (input, "%49s", buf) != 1)
 191     return 0;
 192   if (sizeof buf - 1 <= strlen (buf))
 193     abort ();
 194   s = (char *) malloc (strlen (buf) + 1);
 195   strcpy (s, buf);
 196   yylval = s;
 197   return 'V';
 198 }
 199
 200 void
 201 yyerror (char const *s)
 202 { printf ("%s\n", s);
 203 }
 204
 205 int
 206 main (int argc, char **argv)
 207 {
 208   input = stdin;
 209   if (argc == 2 && !(input = fopen (argv[1], "r"))) return 3;
 210   return yyparse ();
 211 }
 212 ]])
 213
 214 AT_BISON_CHECK([[-o glr-regr2a.c glr-regr2a.y]], 0, [],
 215 [glr-regr2a.y: conflicts: 2 shift/reduce
 216 ])
 217 AT_COMPILE([glr-regr2a])
 218
 219 AT_PARSER_CHECK([[echo s VARIABLE_1 t v x q | ./glr-regr2a]], 0,
 220 [[Variable: 'VARIABLE_1'
 221 ]], [])
 222 AT_PARSER_CHECK([[echo s VARIABLE_1 , ANOTHER_VARIABLE_2 t e | ./glr-regr2a]],
 223 0,
 224 [[Varlist: 'VARIABLE_1,ANOTHER_VARIABLE_2'
 225 ]])
 226 AT_PARSER_CHECK([[echo s VARIABLE_3 t v x | ./glr-regr2a]], 0,
 227 [[Variable: 'VARIABLE_3'
 228 ]], [])
 229
 230
 231 AT_CLEANUP
 232
 233 ## ------------------------------------------------------------ ##
 234 ## Improper merging of GLR delayed action sets                  ##
 235 ## ------------------------------------------------------------ ##
 236
 237 AT_SETUP([Improper merging of GLR delayed action sets])
 238
 239 AT_DATA_GRAMMAR([glr-regr3.y],
 240 [[/* Regression Test: Improper merging of GLR delayed action sets.  */
 241 /* Reported by M. Rosien */
 242
 243 %{
 244 #include <stdio.h>
 245 #include <stdlib.h>
 246 #include <stdarg.h>
 247
 248 static int MergeRule (int x0, int x1);
 249 static void yyerror (char const * s);
 250 int yylex (void);
 251
 252 #define RULE(x) (1 << (x))
 253
 254 %}
 255
 256 %glr-parser
 257
 258 %token BAD_CHAR
 259 %token P1 P2 T1 T2 T3 T4 O1 O2
 260
 261 %%
 262
 263 S : P1 T4 O2 NT6 P2  { printf ("Result: %x\n", $4); }
 264 ;
 265
 266 NT1 : P1 T1 O1 T2 P2 { $$ = RULE(2); }  %merge<MergeRule>
 267 ;
 268
 269 NT2 : NT1             { $$ = RULE(3); } %merge<MergeRule>
 270     | P1 NT1 O1 T3 P2 { $$ = RULE(4); } %merge<MergeRule>
 271 ;
 272
 273 NT3 : T3              { $$ = RULE(5); } %merge<MergeRule>
 274     | P1 NT1 O1 T3 P2 { $$ = RULE(6); } %merge<MergeRule>
 275 ;
 276
 277 NT4 : NT3              { $$ = RULE(7); } %merge<MergeRule>
 278     | NT2              { $$ = RULE(8); } %merge<MergeRule>
 279     | P1 NT2 O1 NT3 P2 { $$ = RULE(9); } %merge<MergeRule>
 280 ;
 281
 282 NT5 : NT4              { $$ = RULE(10); } %merge<MergeRule>
 283 ;
 284
 285 NT6 : P1 NT1 O1 T3 P2  { $$ = RULE(11) | $2; } %merge<MergeRule>
 286     | NT5              { $$ = RULE(12) | $1; } %merge<MergeRule>
 287 ;
 288
 289 %%
 290
 291 static int MergeRule (int x0, int x1) {
 292   return x0 | x1;
 293 }
 294
 295 static void yyerror(char const * s) {
 296   fprintf(stderr,"error: %s\n",s);
 297 }
 298
 299 FILE *input = NULL;
 300
 301 int P[] = { P1, P2 };
 302 int O[] = { O1, O2 };
 303 int T[] = { T1, T2, T3, T4 };
 304
 305 int yylex (void)
 306 {
 307   char inp[3];
 308   if (feof (stdin))
 309     abort ();
 310   if (fscanf (input, "%2s", inp) == EOF)
 311     return 0;
 312   switch (inp[0])
 313     {
 314     case 'p': return P[inp[1] - '1'];
 315     case 't': return T[inp[1] - '1'];
 316     case 'o': return O[inp[1] - '1'];
 317     }
 318   return BAD_CHAR;
 319 }
 320
 321 int main(int argc, char* argv[]) {
 322   input = stdin;
 323   if (argc == 2 && !(input = fopen (argv[1], "r"))) return 3;
 324   return yyparse ();
 325 }
 326 ]])
 327
 328 AT_BISON_CHECK([[-o glr-regr3.c glr-regr3.y]], 0, [],
 329 [glr-regr3.y: conflicts: 1 shift/reduce, 1 reduce/reduce
 330 ])
 331 AT_COMPILE([glr-regr3])
 332
 333 AT_PARSER_CHECK([[echo p1 t4 o2 p1 p1 t1 o1 t2 p2 o1 t3 p2 p2 | ./glr-regr3]],
 334 0,
 335 [[Result: 1c04
 336 ]], [])
 337
 338 AT_CLEANUP
 339
 340
 341 ## ------------------------------------------------------------------------- ##
 342 ## Duplicate representation of merged trees.  See                            ##
 343 ## <http://lists.gnu.org/archive/html/help-bison/2005-07/msg00013.html>.     ##
 344 ## ------------------------------------------------------------------------- ##
 345
 346 AT_SETUP([Duplicate representation of merged trees])
 347
 348 AT_DATA_GRAMMAR([glr-regr4.y],
 349 [[
 350 %union { char *ptr; }
 351 %type <ptr> S A A1 A2 B
 352 %glr-parser
 353
 354 %{
 355   #include <stdio.h>
 356   #include <stdlib.h>
 357   #include <string.h>
 358   static char *merge (YYSTYPE, YYSTYPE);
 359   static char *make_value (char const *, char const *);
 360   static void yyerror (char const *);
 361   static int yylex (void);
 362   static char *ptrs[100];
 363   static char **ptrs_next = ptrs;
 364 %}
 365
 366 %%
 367
 368 tree: S { printf ("%s\n", $1); } ;
 369
 370 S:
 371   A   %merge<merge> { $$ = make_value ("S", $1); }
 372   | B %merge<merge> { $$ = make_value ("S", $1); }
 373   ;
 374
 375 A:
 376   A1   %merge<merge> { $$ = make_value ("A", $1); }
 377   | A2 %merge<merge> { $$ = make_value ("A", $1); }
 378   ;
 379
 380 A1: 'a' { $$ = make_value ("A1", "'a'"); } ;
 381 A2: 'a' { $$ = make_value ("A2", "'a'"); } ;
 382 B:  'a' { $$ = make_value ("B", "'a'");  } ;
 383
 384 %%
 385
 386 static int
 387 yylex (void)
 388 {
 389   static char const input[] = "a";
 390   static size_t toknum;
 391   if (! (toknum < sizeof input))
 392     abort ();
 393   return input[toknum++];
 394 }
 395
 396 int
 397 main (void)
 398 {
 399   int status = yyparse ();
 400   while (ptrs_next != ptrs)
 401     free (*--ptrs_next);
 402   return status;
 403 }
 404
 405 static char *
 406 make_value (char const *parent, char const *child)
 407 {
 408   char const format[] = "%s <- %s";
 409   char *value = *ptrs_next++ =
 410     (char *) malloc (strlen (parent) + strlen (child) + sizeof format);
 411   sprintf (value, format, parent, child);
 412   return value;
 413 }
 414
 415 static char *
 416 merge (YYSTYPE s1, YYSTYPE s2)
 417 {
 418   char const format[] = "merge{ %s and %s }";
 419   char *value = *ptrs_next++ =
 420     (char *) malloc (strlen (s1.ptr) + strlen (s2.ptr) + sizeof format);
 421   sprintf (value, format, s1.ptr, s2.ptr);
 422   return value;
 423 }
 424
 425 static void
 426 yyerror (char const *msg)
 427 {
 428   fprintf (stderr, "%s\n", msg);
 429 }
 430 ]])
 431
 432 AT_BISON_CHECK([[-o glr-regr4.c glr-regr4.y]], 0, [],
 433 [glr-regr4.y: conflicts: 1 reduce/reduce
 434 ])
 435 AT_COMPILE([glr-regr4])
 436
 437 AT_PARSER_CHECK([[./glr-regr4]], 0,
 438 [[merge{ S <- merge{ A <- A1 <- 'a' and A <- A2 <- 'a' } and S <- B <- 'a' }
 439 ]], [])
 440
 441 AT_CLEANUP
 442
 443
 444 ## -------------------------------------------------------------------------- ##
 445 ## User destructor for unresolved GLR semantic value.  See                    ##
 446 ## <http://lists.gnu.org/archive/html/bison-patches/2005-08/msg00016.html>.   ##
 447 ## -------------------------------------------------------------------------- ##
 448
 449 AT_SETUP([User destructor for unresolved GLR semantic value])
 450
 451 AT_DATA_GRAMMAR([glr-regr5.y],
 452 [[
 453 %{
 454   #include <stdio.h>
 455   #include <stdlib.h>
 456   static void yyerror (char const *);
 457   static int yylex (void);
 458   enum { MAGIC_VALUE = -1057808125 }; /* originally chosen at random */
 459 %}
 460
 461 %glr-parser
 462 %union { int value; }
 463 %type <value> start
 464
 465 %destructor {
 466   if ($$ != MAGIC_VALUE)
 467     {
 468       fprintf (stderr, "Bad destructor call.\n");
 469       exit (EXIT_FAILURE);
 470     }
 471 } start
 472
 473 %%
 474
 475 start:
 476    'a' { $$ = MAGIC_VALUE; }
 477    | 'a' { $$ = MAGIC_VALUE; }
 478    ;
 479
 480 %%
 481
 482 static int
 483 yylex (void)
 484 {
 485   static char const input[] = "a";
 486   static size_t toknum;
 487   if (! (toknum < sizeof input))
 488     abort ();
 489   return input[toknum++];
 490 }
 491
 492 static void
 493 yyerror (char const *msg)
 494 {
 495   fprintf (stderr, "%s\n", msg);
 496 }
 497
 498 int
 499 main (void)
 500 {
 501   return yyparse () != 1;
 502 }
 503 ]])
 504
 505 AT_BISON_CHECK([[-o glr-regr5.c glr-regr5.y]], 0, [],
 506 [glr-regr5.y: conflicts: 1 reduce/reduce
 507 ])
 508 AT_COMPILE([glr-regr5])
 509
 510 AT_PARSER_CHECK([[./glr-regr5]], 0, [],
 511 [syntax is ambiguous
 512 ])
 513
 514 AT_CLEANUP
 515
 516
 517 ## -------------------------------------------------------------------------- ##
 518 ## User destructor after an error during a split parse.  See                  ##
 519 ## <http://lists.gnu.org/archive/html/bison-patches/2005-08/msg00029.html>.   ##
 520 ## -------------------------------------------------------------------------- ##
 521
 522 AT_SETUP([User destructor after an error during a split parse])
 523
 524 AT_DATA_GRAMMAR([glr-regr6.y],
 525 [[
 526 %{
 527   #include <stdio.h>
 528   #include <stdlib.h>
 529   static void yyerror (char const *);
 530   static int yylex (void);
 531 %}
 532
 533 %glr-parser
 534 %union { int value; }
 535 %type <value> 'a'
 536
 537 %destructor {
 538   printf ("Destructor called.\n");
 539 } 'a'
 540
 541 %%
 542
 543 start: 'a' | 'a' ;
 544
 545 %%
 546
 547 static int
 548 yylex (void)
 549 {
 550   static char const input[] = "a";
 551   static size_t toknum;
 552   if (! (toknum < sizeof input))
 553     abort ();
 554   return input[toknum++];
 555 }
 556
 557 static void
 558 yyerror (char const *msg)
 559 {
 560   fprintf (stderr, "%s\n", msg);
 561 }
 562
 563 int
 564 main (void)
 565 {
 566   return yyparse () != 1;
 567 }
 568 ]])
 569
 570 AT_BISON_CHECK([[-o glr-regr6.c glr-regr6.y]], 0, [],
 571 [glr-regr6.y: conflicts: 1 reduce/reduce
 572 ])
 573 AT_COMPILE([glr-regr6])
 574
 575 AT_PARSER_CHECK([[./glr-regr6]], 0,
 576 [Destructor called.
 577 ],
 578 [syntax is ambiguous
 579 ])
 580
 581 AT_CLEANUP
 582
 583
 584 ## ------------------------------------------------------------------------- ##
 585 ## Duplicated user destructor for lookahead.  See                            ##
 586 ## <http://lists.gnu.org/archive/html/bison-patches/2005-08/msg00035.html>.  ##
 587 ## ------------------------------------------------------------------------- ##
 588
 589 AT_SETUP([Duplicated user destructor for lookahead])
 590
 591 AT_DATA_GRAMMAR([glr-regr7.y],
 592 [[
 593 %{
 594   #include <stdio.h>
 595   #include <stdlib.h>
 596   static void yyerror (char const *);
 597   static int yylex (void);
 598   #define YYSTACKEXPANDABLE 0
 599   typedef struct count_node {
 600     int count;
 601     struct count_node *prev;
 602   } count_node;
 603   static count_node *tail;
 604 %}
 605
 606 %glr-parser
 607 %union { count_node *node; }
 608 %type <node> 'a'
 609
 610 %destructor {
 611   if ($$->count++)
 612     fprintf (stderr, "Destructor called on same value twice.\n");
 613 } 'a'
 614
 615 %%
 616
 617 start:
 618     stack1 start
 619   | stack2 start
 620   | /* empty */
 621   ;
 622 stack1: 'a' ;
 623 stack2: 'a' ;
 624
 625 %%
 626
 627 static int
 628 yylex (void)
 629 {
 630   yylval.node = (count_node*) malloc (sizeof *yylval.node);
 631   if (!yylval.node)
 632     {
 633       fprintf (stderr, "Test inconclusive.\n");
 634       exit (EXIT_FAILURE);
 635     }
 636   yylval.node->count = 0;
 637   yylval.node->prev = tail;
 638   tail = yylval.node;
 639   return 'a';
 640 }
 641
 642 static void
 643 yyerror (char const *msg)
 644 {
 645   fprintf (stderr, "%s\n", msg);
 646 }
 647
 648 int
 649 main (void)
 650 {
 651   int status = yyparse ();
 652   while (tail)
 653     {
 654       count_node *prev = tail->prev;
 655       free (tail);
 656       tail = prev;
 657     }
 658   return status;
 659 }
 660 ]])
 661
 662 AT_BISON_CHECK([[-o glr-regr7.c glr-regr7.y]], 0, [],
 663 [glr-regr7.y: conflicts: 2 reduce/reduce
 664 ])
 665 AT_COMPILE([glr-regr7])
 666
 667 AT_PARSER_CHECK([[./glr-regr7]], 2, [],
 668 [memory exhausted
 669 ])
 670
 671 AT_CLEANUP
 672
 673
 674 ## ------------------------------------------------------------------------- ##
 675 ## Incorrect default location for empty right-hand sides.  Adapted from bug  ##
 676 ## report by Claudia Hermann.                                                ##
 677 ## See http://lists.gnu.org/archive/html/bug-bison/2005-10/msg00069.html and ##
 678 ## http://lists.gnu.org/archive/html/bug-bison/2005-10/msg00072.html         ##
 679 ## ------------------------------------------------------------------------- ##
 680
 681 AT_SETUP([Incorrectly initialized location for empty right-hand side in GLR])
 682
 683 AT_DATA_GRAMMAR([glr-regr8.y],
 684 [[
 685 %{
 686   #include <stdio.h>
 687   #include <stdlib.h>
 688   static void yyerror (char const *);
 689   static int yylex (void);
 690   static void yyerror (char const *msg);
 691 %}
 692
 693 %token T_CONSTANT
 694 %token T_PORT
 695 %token T_SIGNAL
 696
 697 %glr-parser
 698
 699 %%
 700
 701
 702 PortClause      : T_PORT InterfaceDeclaration T_PORT
 703                 { printf("%d/%d - %d/%d - %d/%d\n",
 704                          @1.first_column, @1.last_column,
 705                          @2.first_column, @2.last_column,
 706                          @3.first_column, @3.last_column); }
 707         ;
 708
 709 InterfaceDeclaration    : OptConstantWord       %dprec 1
 710         | OptSignalWord %dprec 2
 711         ;
 712
 713 OptConstantWord : /* empty */
 714         | T_CONSTANT
 715         ;
 716
 717 OptSignalWord   : /* empty */
 718                 { printf("empty: %d/%d\n", @$.first_column, @$.last_column); }
 719         | T_SIGNAL
 720         ;
 721
 722 %%
 723
 724 void
 725 yyerror (char const *msg)
 726 {
 727   fprintf (stderr, "%s\n", msg);
 728 }
 729
 730 static int lexIndex;
 731
 732 int yylex (void)
 733 {
 734   lexIndex += 1;
 735   switch (lexIndex)
 736     {
 737     default:
 738       abort ();
 739     case 1:
 740       yylloc.first_column = 1;
 741       yylloc.last_column = 9;
 742       return T_PORT;
 743     case 2:
 744       yylloc.first_column = 13;
 745       yylloc.last_column = 17;
 746       return T_PORT;
 747     case 3:
 748       return 0;
 749     }
 750 }
 751
 752 int
 753 main (void)
 754 {
 755   yyparse();
 756   return 0;
 757 }
 758 ]])
 759
 760 AT_BISON_CHECK([[-o glr-regr8.c glr-regr8.y]], 0, [],
 761 [glr-regr8.y: conflicts: 1 reduce/reduce
 762 ])
 763 AT_COMPILE([glr-regr8])
 764
 765 AT_PARSER_CHECK([[./glr-regr8]], 0,
 766 [empty: 9/9
 767 1/9 - 9/9 - 13/17
 768 ],
 769 [])
 770
 771 AT_CLEANUP
 772
 773
 774 ## ------------------------------------------------------------------------- ##
 775 ## No users destructors if stack 0 deleted.  See                             ##
 776 ## <http://lists.gnu.org/archive/html/bison-patches/2005-09/msg00109.html>.  ##
 777 ## ------------------------------------------------------------------------- ##
 778
 779 AT_SETUP([No users destructors if stack 0 deleted])
 780
 781 AT_DATA_GRAMMAR([glr-regr9.y],
 782 [[
 783 %{
 784 # include <stdio.h>
 785 # include <stdlib.h>
 786   static void yyerror (char const *);
 787   static int yylex (void);
 788 # define YYSTACKEXPANDABLE 0
 789   static int tokens = 0;
 790   static int destructors = 0;
 791 # define USE(Var)
 792 %}
 793
 794 %glr-parser
 795 %union { int dummy; }
 796 %type <dummy> 'a'
 797
 798 %destructor {
 799   destructors += 1;
 800 } 'a'
 801
 802 %%
 803
 804 start:
 805     ambig0 'a'   { destructors += 2; USE ($2); }
 806   | ambig1 start { destructors += 1; }
 807   | ambig2 start { destructors += 1; }
 808   ;
 809
 810 ambig0: 'a' ;
 811 ambig1: 'a' ;
 812 ambig2: 'a' ;
 813
 814 %%
 815
 816 static int
 817 yylex (void)
 818 {
 819   tokens += 1;
 820   return 'a';
 821 }
 822
 823 static void
 824 yyerror (char const *msg)
 825 {
 826   fprintf (stderr, "%s\n", msg);
 827 }
 828
 829 int
 830 main (void)
 831 {
 832   int exit_status;
 833   exit_status = yyparse ();
 834   if (tokens != destructors)
 835     {
 836       fprintf (stderr, "Tokens = %d, Destructors = %d\n", tokens, destructors);
 837       return 1;
 838     }
 839   return !exit_status;
 840 }
 841 ]])
 842
 843 AT_BISON_CHECK([[-o glr-regr9.c glr-regr9.y]], 0, [],
 844 [glr-regr9.y: conflicts: 1 reduce/reduce
 845 ])
 846 AT_COMPILE([glr-regr9])
 847
 848 AT_PARSER_CHECK([[./glr-regr9]], 0, [],
 849 [memory exhausted
 850 ])
 851
 852 AT_CLEANUP
 853
 854
 855 ## ------------------------------------------------------------------------- ##
 856 ## Corrupted semantic options if user action cuts parse.                     ##
 857 ## ------------------------------------------------------------------------- ##
 858
 859 AT_SETUP([Corrupted semantic options if user action cuts parse])
 860
 861 AT_DATA_GRAMMAR([glr-regr10.y],
 862 [[
 863 %{
 864 # include <stdlib.h>
 865 # include <stdio.h>
 866   static void yyerror (char const *);
 867   static int yylex (void);
 868   #define GARBAGE_SIZE 50
 869   static char garbage[GARBAGE_SIZE];
 870 %}
 871
 872 %glr-parser
 873 %union { char *ptr; }
 874 %type <ptr> start
 875
 876 %%
 877
 878 start:
 879     %dprec 2 { $$ = garbage; YYACCEPT; }
 880   | %dprec 1 { $$ = garbage; YYACCEPT; }
 881   ;
 882
 883 %%
 884
 885 static void
 886 yyerror (char const *msg)
 887 {
 888   fprintf (stderr, "%s\n", msg);
 889 }
 890
 891 static int
 892 yylex (void)
 893 {
 894   static int called;
 895   if (called++)
 896     abort ();
 897   return 0;
 898 }
 899
 900 int
 901 main (void)
 902 {
 903   int i;
 904   for (i = 0; i < GARBAGE_SIZE; i+=1)
 905     garbage[i] = 108;
 906   return yyparse ();
 907 }
 908 ]])
 909
 910 AT_BISON_CHECK([[-o glr-regr10.c glr-regr10.y]], 0, [],
 911 [glr-regr10.y: conflicts: 1 reduce/reduce
 912 ])
 913 AT_COMPILE([glr-regr10])
 914
 915 AT_PARSER_CHECK([[./glr-regr10]], 0, [], [])
 916
 917 AT_CLEANUP
 918
 919
 920 ## ------------------------------------------------------------------------- ##
 921 ## Undesirable destructors if user action cuts parse.                        ##
 922 ## ------------------------------------------------------------------------- ##
 923
 924 AT_SETUP([Undesirable destructors if user action cuts parse])
 925
 926 AT_DATA_GRAMMAR([glr-regr11.y],
 927 [[
 928 %{
 929 # include <stdlib.h>
 930   static void yyerror (char const *);
 931   static int yylex (void);
 932   static int destructors = 0;
 933 # define USE(val)
 934 %}
 935
 936 %glr-parser
 937 %union { int dummy; }
 938 %type <int> 'a'
 939 %destructor { destructors += 1; } 'a'
 940
 941 %%
 942
 943 start:
 944     'a' %dprec 2 { USE ($1); destructors += 1; YYACCEPT; }
 945   | 'a' %dprec 1 { USE ($1); destructors += 1; YYACCEPT; }
 946   ;
 947
 948 %%
 949
 950 static void
 951 yyerror (char const *msg)
 952 {
 953   fprintf (stderr, "%s\n", msg);
 954 }
 955
 956 static int
 957 yylex (void)
 958 {
 959   static char const input[] = "a";
 960   static size_t toknum;
 961   if (! (toknum < sizeof input))
 962     abort ();
 963   return input[toknum++];
 964 }
 965
 966 int
 967 main (void)
 968 {
 969   int exit_status = yyparse ();
 970   if (destructors != 1)
 971     {
 972       fprintf (stderr, "Destructor calls: %d\n", destructors);
 973       return 1;
 974     }
 975   return exit_status;
 976 }
 977 ]])
 978
 979 AT_BISON_CHECK([[-o glr-regr11.c glr-regr11.y]], 0, [],
 980 [glr-regr11.y: conflicts: 1 reduce/reduce
 981 ])
 982 AT_COMPILE([glr-regr11])
 983
 984 AT_PARSER_CHECK([[./glr-regr11]], 0, [], [])
 985
 986 AT_CLEANUP
 987
 988
 989 ## ------------------------------------------------------------------------- ##
 990 ## Leaked semantic values if user action cuts parse.                         ##
 991 ## ------------------------------------------------------------------------- ##
 992
 993 AT_SETUP([Leaked semantic values if user action cuts parse])
 994
 995 AT_DATA_GRAMMAR([glr-regr12.y],
 996 [[
 997 %glr-parser
 998 %union { int dummy; }
 999 %token PARENT_RHS_AFTER
1000 %type <dummy> parent_rhs_before merged PARENT_RHS_AFTER
1001 %destructor { parent_rhs_before_value = 0; } parent_rhs_before
1002 %destructor { merged_value = 0; } merged
1003 %destructor { parent_rhs_after_value = 0; } PARENT_RHS_AFTER
1004
1005 %{
1006 # include <stdlib.h>
1007   static int merge (YYSTYPE, YYSTYPE);
1008   static void yyerror (char const *);
1009   static int yylex (void);
1010   static int parent_rhs_before_value = 0;
1011   static int merged_value = 0;
1012   static int parent_rhs_after_value = 0;
1013 # define USE(val)
1014 %}
1015
1016 %%
1017
1018 start:
1019   alt1 %dprec 1
1020   | alt2 %dprec 2
1021   ;
1022
1023 alt1:
1024   PARENT_RHS_AFTER {
1025     USE ($1);
1026     parent_rhs_after_value = 0;
1027   }
1028   ;
1029
1030 alt2:
1031   parent_rhs_before merged PARENT_RHS_AFTER {
1032     USE (($1, $2, $3));
1033     parent_rhs_before_value = 0;
1034     merged_value = 0;
1035     parent_rhs_after_value = 0;
1036   }
1037   ;
1038
1039 parent_rhs_before:
1040   {
1041     USE ($$);
1042     parent_rhs_before_value = 1;
1043   }
1044   ;
1045
1046 merged:
1047   %merge<merge> {
1048     USE ($$);
1049     merged_value = 1;
1050   }
1051   | cut %merge<merge> {
1052     USE ($$);
1053     merged_value = 1;
1054   }
1055   ;
1056
1057 cut: { YYACCEPT; } ;
1058
1059 %%
1060
1061 static int
1062 merge (YYSTYPE s1, YYSTYPE s2)
1063 {
1064   /* Not invoked. */
1065   char dummy = s1.dummy + s2.dummy;
1066   return dummy;
1067 }
1068
1069 static void
1070 yyerror (char const *msg)
1071 {
1072   fprintf (stderr, "%s\n", msg);
1073 }
1074
1075 static int
1076 yylex (void)
1077 {
1078   static int const input[] = { PARENT_RHS_AFTER, 0 };
1079   static size_t toknum;
1080   if (! (toknum < sizeof input / sizeof *input))
1081     abort ();
1082   if (input[toknum] == PARENT_RHS_AFTER)
1083     parent_rhs_after_value = 1;
1084   return input[toknum++];
1085 }
1086
1087 int
1088 main (void)
1089 {
1090   int exit_status = yyparse ();
1091   if (parent_rhs_before_value)
1092     {
1093       fprintf (stderr, "`parent_rhs_before' destructor not called.\n");
1094       exit_status = 1;
1095     }
1096   if (merged_value)
1097     {
1098       fprintf (stderr, "`merged' destructor not called.\n");
1099       exit_status = 1;
1100     }
1101   if (parent_rhs_after_value)
1102     {
1103       fprintf (stderr, "`PARENT_RHS_AFTER' destructor not called.\n");
1104       exit_status = 1;
1105     }
1106   return exit_status;
1107 }
1108 ]])
1109
1110 AT_BISON_CHECK([[-o glr-regr12.c glr-regr12.y]], 0, [],
1111 [glr-regr12.y: conflicts: 1 shift/reduce, 1 reduce/reduce
1112 ])
1113 AT_COMPILE([glr-regr12])
1114
1115 AT_PARSER_CHECK([[./glr-regr12]], 0, [], [])
1116
1117 AT_CLEANUP
1118
1119
1120 ## ------------------------------------------------------------------------- ##
1121 ## Incorrect lookahead during deterministic GLR.  See                        ##
1122 ## <http://lists.gnu.org/archive/html/help-bison/2005-07/msg00017.html> and  ##
1123 ## <http://lists.gnu.org/archive/html/bison-patches/2006-01/msg00060.html>.  ##
1124 ## ------------------------------------------------------------------------- ##
1125
1126 AT_SETUP([Incorrect lookahead during deterministic GLR])
1127
1128 AT_DATA_GRAMMAR([glr-regr13.y],
1129 [[
1130 /* Tests:
1131      - Defaulted state with initial yychar: yychar == YYEMPTY.
1132      - Nondefaulted state: yychar != YYEMPTY.
1133      - Defaulted state after lookahead: yychar != YYEMPTY.
1134      - Defaulted state after shift: yychar == YYEMPTY.
1135      - User action changing the lookahead.  */
1136
1137 %{
1138   #include <stdio.h>
1139   static void yyerror (char const *);
1140   static int yylex (void);
1141   static void print_lookahead (char const *);
1142   #define USE(value)
1143 %}
1144
1145 %union { char value; }
1146 %type <value> 'a' 'b'
1147 %glr-parser
1148 %locations
1149
1150 %%
1151
1152 start:
1153   defstate_init defstate_shift 'b' change_lookahead 'a' {
1154     USE ($3);
1155     print_lookahead ("start <- defstate_init defstate_shift 'b'");
1156   }
1157   ;
1158 defstate_init:
1159   {
1160     print_lookahead ("defstate_init <- empty string");
1161   }
1162   ;
1163 defstate_shift:
1164   nondefstate defstate_look 'a' {
1165     USE ($3);
1166     print_lookahead ("defstate_shift <- nondefstate defstate_look 'a'");
1167   }
1168   ;
1169 defstate_look:
1170   {
1171     print_lookahead ("defstate_look <- empty string");
1172   }
1173   ;
1174 nondefstate:
1175   {
1176     print_lookahead ("nondefstate <- empty string");
1177   }
1178   | 'b' {
1179     USE ($1);
1180     print_lookahead ("nondefstate <- 'b'");
1181   }
1182   ;
1183 change_lookahead:
1184   {
1185     yychar = 'a';
1186   }
1187   ;
1188
1189 %%
1190
1191 static void
1192 yyerror (char const *msg)
1193 {
1194   fprintf (stderr, "%s\n", msg);
1195 }
1196
1197 static int
1198 yylex (void)
1199 {
1200   static char const input[] = "ab";
1201   static size_t toknum;
1202   if (! (toknum < sizeof input))
1203     abort ();
1204   yylloc.first_line = yylloc.last_line = 1;
1205   yylloc.first_column = yylloc.last_column = toknum + 1;
1206   yylval.value = input[toknum] + 'A' - 'a';
1207   return input[toknum++];
1208 }
1209
1210 static void
1211 print_lookahead (char const *reduction)
1212 {
1213   printf ("%s:\n  yychar=", reduction);
1214   if (yychar == YYEMPTY)
1215     printf ("YYEMPTY");
1216   else if (yychar == YYEOF)
1217     printf ("YYEOF");
1218   else
1219     {
1220       printf ("'%c', yylval='", yychar);
1221       if (yylval.value > ' ')
1222         printf ("%c", yylval.value);
1223       printf ("', yylloc=(%d,%d),(%d,%d)",
1224               yylloc.first_line, yylloc.first_column,
1225               yylloc.last_line, yylloc.last_column);
1226     }
1227   printf ("\n");
1228 }
1229
1230 int
1231 main (void)
1232 {
1233   yychar = '#'; /* Not a token in the grammar.  */
1234   yylval.value = '!';
1235   return yyparse ();
1236 }
1237 ]])
1238
1239 AT_BISON_CHECK([[-o glr-regr13.c glr-regr13.y]], 0, [], [])
1240 AT_COMPILE([glr-regr13])
1241
1242 AT_PARSER_CHECK([[./glr-regr13]], 0,
1243 [defstate_init <- empty string:
1244   yychar=YYEMPTY
1245 nondefstate <- empty string:
1246   yychar='a', yylval='A', yylloc=(1,1),(1,1)
1247 defstate_look <- empty string:
1248   yychar='a', yylval='A', yylloc=(1,1),(1,1)
1249 defstate_shift <- nondefstate defstate_look 'a':
1250   yychar=YYEMPTY
1251 start <- defstate_init defstate_shift 'b':
1252   yychar=YYEMPTY
1253 ], [])
1254
1255 AT_CLEANUP
1256
1257
1258 ## ------------------------------------------------------------------------- ##
1259 ## Incorrect lookahead during nondeterministic GLR.                          ##
1260 ## ------------------------------------------------------------------------- ##
1261
1262 AT_SETUP([Incorrect lookahead during nondeterministic GLR])
1263
1264 AT_DATA_GRAMMAR([glr-regr14.y],
1265 [[
1266 /* Tests:
1267      - Conflicting actions (split-off parse, which copies lookahead need,
1268        which is necessarily yytrue) and nonconflicting actions (non-split-off
1269        parse) for nondefaulted state: yychar != YYEMPTY.
1270      - Merged deferred actions (lookahead need and RHS from different stack
1271        than the target state) and nonmerged deferred actions (same stack).
1272      - Defaulted state after lookahead: yychar != YYEMPTY.
1273      - Defaulted state after shift: yychar == YYEMPTY.
1274      - yychar != YYEMPTY but lookahead need is yyfalse (a previous stack has
1275        seen the lookahead but current stack has not).
1276      - Exceeding stack capacity (stack explosion), and thus reallocating
1277        lookahead need array.
1278    Note that it does not seem possible to see the initial yychar value during
1279    nondeterministic operation since:
1280      - In order to preserve the initial yychar, only defaulted states may be
1281        entered.
1282      - If only defaulted states are entered, there are no conflicts, so
1283        nondeterministic operation does not start.  */
1284
1285 %union { char value; }
1286
1287 %{
1288   #include <stdlib.h>
1289   #include <stdio.h>
1290   static void yyerror (char const *);
1291   static int yylex (void);
1292   static void print_lookahead (char const *);
1293   static char merge (union YYSTYPE, union YYSTYPE);
1294   #define USE(value)
1295 %}
1296
1297 %type <value> 'a' 'b' 'c' 'd' stack_explosion
1298 %glr-parser
1299 %locations
1300
1301 %%
1302
1303 start:
1304   merge 'c' stack_explosion {
1305     USE ($2); USE ($3);
1306     print_lookahead ("start <- merge 'c' stack_explosion");
1307   }
1308   ;
1309
1310 /* When merging the 2 deferred actions, the lookahead needs are different.  */
1311 merge:
1312   nonconflict1 'a' 'b' nonconflict2 %dprec 1 {
1313     USE ($2); USE ($3);
1314     print_lookahead ("merge <- nonconflict1 'a' 'b' nonconflict2");
1315   }
1316   | conflict defstate_look 'a' nonconflict2 'b' defstate_shift %dprec 2 {
1317     USE ($3); USE ($5);
1318     print_lookahead ("merge <- conflict defstate_look 'a' nonconflict2 'b'"
1319                       " defstate_shift");
1320   }
1321   ;
1322
1323 nonconflict1:
1324   {
1325     print_lookahead ("nonconflict1 <- empty string");
1326   }
1327   ;
1328 nonconflict2:
1329   {
1330     print_lookahead ("nonconflict2 <- empty string");
1331   }
1332   | 'a' {
1333     USE ($1);
1334     print_lookahead ("nonconflict2 <- 'a'");
1335   }
1336   ;
1337 conflict:
1338   {
1339     print_lookahead ("conflict <- empty string");
1340   }
1341   ;
1342 defstate_look:
1343   {
1344     print_lookahead ("defstate_look <- empty string");
1345   }
1346   ;
1347
1348 /* yychar != YYEMPTY but lookahead need is yyfalse.  */
1349 defstate_shift:
1350   {
1351     print_lookahead ("defstate_shift <- empty string");
1352   }
1353   ;
1354
1355 stack_explosion:
1356   { $$ = '\0'; }
1357   | alt1 stack_explosion %merge<merge> { $$ = $2; }
1358   | alt2 stack_explosion %merge<merge> { $$ = $2; }
1359   | alt3 stack_explosion %merge<merge> { $$ = $2; }
1360   ;
1361 alt1:
1362   'd' no_look {
1363     USE ($1);
1364     if (yychar != 'd' && yychar != YYEOF)
1365       {
1366         fprintf (stderr, "Incorrect lookahead during stack explosion.\n");
1367       }
1368   }
1369   ;
1370 alt2:
1371   'd' no_look {
1372     USE ($1);
1373     if (yychar != 'd' && yychar != YYEOF)
1374       {
1375         fprintf (stderr, "Incorrect lookahead during stack explosion.\n");
1376       }
1377   }
1378   ;
1379 alt3:
1380   'd' no_look {
1381     USE ($1);
1382     if (yychar != 'd' && yychar != YYEOF)
1383       {
1384         fprintf (stderr, "Incorrect lookahead during stack explosion.\n");
1385       }
1386   }
1387   ;
1388 no_look:
1389   {
1390     if (yychar != YYEMPTY)
1391       {
1392         fprintf (stderr,
1393                  "Found lookahead where shouldn't during stack explosion.\n");
1394       }
1395   }
1396   ;
1397
1398 %%
1399
1400 static void
1401 yyerror (char const *msg)
1402 {
1403   fprintf (stderr, "%s\n", msg);
1404 }
1405
1406 static int
1407 yylex (void)
1408 {
1409   static char const input[] = "abcdddd";
1410   static size_t toknum;
1411   if (! (toknum < sizeof input))
1412     abort ();
1413   yylloc.first_line = yylloc.last_line = 1;
1414   yylloc.first_column = yylloc.last_column = toknum + 1;
1415   yylval.value = input[toknum] + 'A' - 'a';
1416   return input[toknum++];
1417 }
1418
1419 static void
1420 print_lookahead (char const *reduction)
1421 {
1422   printf ("%s:\n  yychar=", reduction);
1423   if (yychar == YYEMPTY)
1424     printf ("YYEMPTY");
1425   else if (yychar == YYEOF)
1426     printf ("YYEOF");
1427   else
1428     {
1429       printf ("'%c', yylval='", yychar);
1430       if (yylval.value > ' ')
1431         printf ("%c", yylval.value);
1432       printf ("', yylloc=(%d,%d),(%d,%d)",
1433               yylloc.first_line, yylloc.first_column,
1434               yylloc.last_line, yylloc.last_column);
1435     }
1436   printf ("\n");
1437 }
1438
1439 static char
1440 merge (union YYSTYPE s1, union YYSTYPE s2)
1441 {
1442   char dummy = s1.value + s2.value;
1443   return dummy;
1444 }
1445
1446 int
1447 main (void)
1448 {
1449   yychar = '#'; /* Not a token in the grammar.  */
1450   yylval.value = '!';
1451   return yyparse ();
1452 }
1453 ]])
1454
1455 AT_BISON_CHECK([[-o glr-regr14.c glr-regr14.y]], 0, [],
1456 [glr-regr14.y: conflicts: 3 reduce/reduce
1457 ])
1458 AT_COMPILE([glr-regr14])
1459
1460 AT_PARSER_CHECK([[./glr-regr14]], 0,
1461 [conflict <- empty string:
1462   yychar='a', yylval='A', yylloc=(1,1),(1,1)
1463 defstate_look <- empty string:
1464   yychar='a', yylval='A', yylloc=(1,1),(1,1)
1465 nonconflict2 <- empty string:
1466   yychar='b', yylval='B', yylloc=(1,2),(1,2)
1467 defstate_shift <- empty string:
1468   yychar=YYEMPTY
1469 merge <- conflict defstate_look 'a' nonconflict2 'b' defstate_shift:
1470   yychar=YYEMPTY
1471 start <- merge 'c' stack_explosion:
1472   yychar=YYEOF
1473 ], [])
1474
1475 AT_CLEANUP
1476
1477
1478 ## ------------------------------------------------------------------------- ##
1479 ## Leaked semantic values when reporting ambiguity.                          ##
1480 ## ------------------------------------------------------------------------- ##
1481
1482 AT_SETUP([Leaked semantic values when reporting ambiguity])
1483
1484 AT_DATA_GRAMMAR([glr-regr15.y],
1485 [[
1486 %glr-parser
1487 %destructor { parent_rhs_before_value = 0; } parent_rhs_before
1488
1489 %{
1490 # include <stdlib.h>
1491   static void yyerror (char const *);
1492   static int yylex (void);
1493   static int parent_rhs_before_value = 0;
1494 # define USE(val)
1495 %}
1496
1497 %%
1498
1499 start:
1500   alt1 %dprec 1
1501   | alt2 %dprec 2
1502   ;
1503
1504 /* This stack must be merged into the other stacks *last* (added at the
1505    beginning of the semantic options list) so that yyparse will choose to clean
1506    it up rather than the tree for which some semantic actions have been
1507    performed.  Thus, if yyreportAmbiguity longjmp's to yyparse, the values from
1508    those other trees are not cleaned up.  */
1509 alt1: ;
1510
1511 alt2:
1512   parent_rhs_before ambiguity {
1513     USE ($1);
1514     parent_rhs_before_value = 0;
1515   }
1516   ;
1517
1518 parent_rhs_before:
1519   {
1520     USE ($$);
1521     parent_rhs_before_value = 1;
1522   }
1523   ;
1524
1525 ambiguity: ambiguity1 | ambiguity2 ;
1526 ambiguity1: ;
1527 ambiguity2: ;
1528
1529 %%
1530
1531 static void
1532 yyerror (char const *msg)
1533 {
1534   fprintf (stderr, "%s\n", msg);
1535 }
1536
1537 static int
1538 yylex (void)
1539 {
1540   static int called;
1541   if (called++)
1542     abort ();
1543   return 0;
1544 }
1545
1546 int
1547 main (void)
1548 {
1549   int exit_status = yyparse () != 1;
1550   if (parent_rhs_before_value)
1551     {
1552       fprintf (stderr, "`parent_rhs_before' destructor not called.\n");
1553       exit_status = 1;
1554     }
1555   return exit_status;
1556 }
1557 ]])
1558
1559 AT_BISON_CHECK([[-o glr-regr15.c glr-regr15.y]], 0, [],
1560 [glr-regr15.y: conflicts: 2 reduce/reduce
1561 ])
1562 AT_COMPILE([glr-regr15])
1563
1564 AT_PARSER_CHECK([[./glr-regr15]], 0, [],
1565 [syntax is ambiguous
1566 ])
1567
1568 AT_CLEANUP
1569
1570
1571 ## ------------------------------------------------------------------------- ##
1572 ## Leaked lookahead after nondeterministic parse syntax error.               ##
1573 ## ------------------------------------------------------------------------- ##
1574
1575 AT_SETUP([Leaked lookahead after nondeterministic parse syntax error])
1576 AT_DATA_GRAMMAR([glr-regr16.y],
1577 [[
1578 %glr-parser
1579 %destructor { lookahead_value = 0; } 'b'
1580
1581 %{
1582 # include <stdlib.h>
1583   static void yyerror (char const *);
1584   static int yylex (void);
1585   static int lookahead_value = 0;
1586 # define USE(val)
1587 %}
1588
1589 %%
1590
1591 start: alt1 'a' | alt2 'a' ;
1592 alt1: ;
1593 alt2: ;
1594
1595 %%
1596
1597 static void
1598 yyerror (char const *msg)
1599 {
1600   fprintf (stderr, "%s\n", msg);
1601 }
1602
1603 static int
1604 yylex (void)
1605 {
1606   static char const input[] = "ab";
1607   static size_t toknum;
1608   if (! (toknum < sizeof input))
1609     abort ();
1610   if (input[toknum] == 'b')
1611     lookahead_value = 1;
1612   return input[toknum++];
1613 }
1614
1615 int
1616 main (void)
1617 {
1618   int exit_status = yyparse () != 1;
1619   if (lookahead_value)
1620     {
1621       fprintf (stderr, "Lookahead destructor not called.\n");
1622       exit_status = 1;
1623     }
1624   return exit_status;
1625 }
1626 ]])
1627
1628 AT_BISON_CHECK([[-o glr-regr16.c glr-regr16.y]], 0, [],
1629 [glr-regr16.y: conflicts: 1 reduce/reduce
1630 ])
1631 AT_COMPILE([glr-regr16])
1632
1633 AT_PARSER_CHECK([[./glr-regr16]], 0, [],
1634 [syntax error
1635 ])
1636
1637 AT_CLEANUP
1638
1639
1640 ## ------------------------------------------------------------------------- ##
1641 ## Uninitialized location when reporting ambiguity.                          ##
1642 ## ------------------------------------------------------------------------- ##
1643
1644 AT_SETUP([Uninitialized location when reporting ambiguity])
1645 AT_DATA_GRAMMAR([glr-regr17.y],
1646 [[
1647 %glr-parser
1648 %locations
1649 %define api.pure
1650 %error-verbose
1651
1652 %union { int dummy; }
1653
1654 %{
1655   static void yyerror (YYLTYPE *, char const *);
1656   static int yylex (YYSTYPE *, YYLTYPE *);
1657 %}
1658
1659 %initial-action {
1660   @$.first_line = 1;
1661   @$.first_column = 1;
1662   @$.last_line = 1;
1663   @$.last_column = 1;
1664 }
1665
1666 %%
1667
1668 /* Tests the case of an empty RHS that has inherited the location of the
1669    previous nonterminal, which is unresolved.  That location is reported as the
1670    last position of the ambiguity.  */
1671 start: ambig1 empty1 | ambig2 empty2 ;
1672
1673 /* Tests multiple levels of yyresolveLocations recursion.  */
1674 ambig1: sub_ambig1 | sub_ambig2 ;
1675 ambig2: sub_ambig1 | sub_ambig2 ;
1676
1677 /* Tests the case of a non-empty RHS as well as the case of an empty RHS that
1678    has inherited the initial location.  The empty RHS's location is reported as
1679    the first position in the ambiguity.  */
1680 sub_ambig1: empty1 'a' 'b' ;
1681 sub_ambig2: empty2 'a' 'b' ;
1682 empty1: ;
1683 empty2: ;
1684
1685 %%
1686
1687 static void
1688 yyerror (YYLTYPE *locp, char const *msg)
1689 {
1690   fprintf (stderr, "Error at %d.%d-%d.%d: %s.\n", locp->first_line,
1691            locp->first_column, locp->last_line, locp->last_column, msg);
1692 }
1693
1694 static int
1695 yylex (YYSTYPE *lvalp, YYLTYPE *llocp)
1696 {
1697   static char const input[] = "ab";
1698   static size_t toknum;
1699   if (! (toknum < sizeof input))
1700     abort ();
1701   lvalp->dummy = 0;
1702   llocp->first_line = llocp->last_line = 2;
1703   llocp->first_column = toknum + 1;
1704   llocp->last_column = llocp->first_column + 1;
1705   return input[toknum++];
1706 }
1707
1708 int
1709 main (void)
1710 {
1711   return yyparse () != 1;
1712 }
1713 ]])
1714
1715 AT_BISON_CHECK([[-o glr-regr17.c glr-regr17.y]], 0, [],
1716 [glr-regr17.y: conflicts: 3 reduce/reduce
1717 ])
1718 AT_COMPILE([glr-regr17])
1719
1720 AT_PARSER_CHECK([[./glr-regr17]], 0, [],
1721 [Error at 1.1-2.3: syntax is ambiguous.
1722 ])
1723
1724 AT_CLEANUP
1725
1726
1727 ## -------------------------------------------------------------##
1728 ## Missed %merge type warnings when LHS type is declared later. ##
1729 ## -------------------------------------------------------------##
1730
1731 AT_SETUP([Missed %merge type warnings when LHS type is declared later])
1732 AT_DATA_GRAMMAR([glr-regr18.y],
1733 [[%glr-parser
1734
1735 %{
1736   #include <stdlib.h>
1737   static void yyerror (char const *);
1738   static int yylex ();
1739 %}
1740
1741 %union {
1742   int type1;
1743   int type2;
1744   int type3;
1745 }
1746
1747 %%
1748
1749 sym1: sym2 %merge<merge> { $$ = $1; } ;
1750 sym2: sym3 %merge<merge> { $$ = $1; } ;
1751 sym3: %merge<merge> { $$ = 0; } ;
1752
1753 %type <type1> sym1;
1754 %type <type2> sym2;
1755 %type <type3> sym3;
1756
1757 %%
1758
1759 static void
1760 yyerror (char const *msg)
1761 {
1762   fprintf (stderr, "%s\n", msg);
1763 }
1764
1765 static int
1766 yylex ()
1767 {
1768   static int called;
1769   if (called++)
1770     abort ();
1771   return 0;
1772 }
1773
1774 int
1775 main (void)
1776 {
1777   return yyparse ();
1778 }
1779 ]])
1780
1781 AT_BISON_CHECK([[-o glr-regr18.c glr-regr18.y]], 1, [],
1782 [glr-regr18.y:26.18-24: result type clash on merge function `merge': <type2> != <type1>
1783 glr-regr18.y:25.18-24: previous declaration
1784 glr-regr18.y:27.13-19: result type clash on merge function `merge': <type3> != <type2>
1785 glr-regr18.y:26.18-24: previous declaration
1786 ])
1787
1788 AT_CLEANUP