tests/actions.at

   1 # Executing Actions.                               -*- Autotest -*-
   2 # Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software
   3 # Foundation, Inc.
   4
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 AT_BANNER([[User Actions.]])
  19
  20 ## ------------------ ##
  21 ## Mid-rule actions.  ##
  22 ## ------------------ ##
  23
  24 AT_SETUP([Mid-rule actions])
  25
  26 # Bison once forgot the mid-rule actions.  It was because the action
  27 # was attached to the host rule (the one with the mid-rule action),
  28 # instead of being attached to the empty rule dedicated to this
  29 # action.
  30
  31 AT_DATA_GRAMMAR([[input.y]],
  32 [[%error-verbose
  33 %debug
  34 %{
  35 # include <stdio.h>
  36 # include <stdlib.h>
  37   static void yyerror (const char *msg);
  38   static int yylex (void);
  39 %}
  40 %%
  41 exp:     { putchar ('0'); }
  42      '1' { putchar ('1'); }
  43      '2' { putchar ('2'); }
  44      '3' { putchar ('3'); }
  45      '4' { putchar ('4'); }
  46      '5' { putchar ('5'); }
  47      '6' { putchar ('6'); }
  48      '7' { putchar ('7'); }
  49      '8' { putchar ('8'); }
  50      '9' { putchar ('9'); }
  51          { putchar ('\n'); }
  52    ;
  53 %%
  54 static int
  55 yylex (void)
  56 {
  57   static char const input[] = "123456789";
  58   static size_t toknum;
  59   if (! (toknum < sizeof input))
  60     abort ();
  61   return input[toknum++];
  62 }
  63
  64 static void
  65 yyerror (const char *msg)
  66 {
  67   fprintf (stderr, "%s\n", msg);
  68 }
  69
  70 int
  71 main (void)
  72 {
  73   return yyparse ();
  74 }
  75 ]])
  76
  77 AT_BISON_CHECK([-d -v -o input.c input.y])
  78 AT_COMPILE([input])
  79 AT_PARSER_CHECK([./input], 0,
  80 [[0123456789
  81 ]])
  82
  83 AT_CLEANUP
  84
  85
  86
  87
  88
  89 ## ---------------- ##
  90 ## Exotic Dollars.  ##
  91 ## ---------------- ##
  92
  93 AT_SETUP([Exotic Dollars])
  94
  95 AT_DATA_GRAMMAR([[input.y]],
  96 [[%error-verbose
  97 %debug
  98 %{
  99 # include <stdio.h>
 100 # include <stdlib.h>
 101   static void yyerror (const char *msg);
 102   static int yylex (void);
 103 # define USE(Var)
 104 %}
 105
 106 %union
 107 {
 108   int val;
 109 };
 110
 111 %type <val> a_1 a_2 a_5
 112             sum_of_the_five_previous_values
 113
 114 %%
 115 exp: a_1 a_2 { $<val>$ = 3; } { $<val>$ = $<val>3 + 1; } a_5
 116      sum_of_the_five_previous_values
 117     {
 118        USE (($1, $2, $<foo>3, $<foo>4, $5));
 119        printf ("%d\n", $6);
 120     }
 121 ;
 122 a_1: { $$ = 1; };
 123 a_2: { $$ = 2; };
 124 a_5: { $$ = 5; };
 125
 126 sum_of_the_five_previous_values:
 127     {
 128        $$ = $<val>0 + $<val>-1 + $<val>-2 + $<val>-3 + $<val>-4;
 129     }
 130 ;
 131
 132 %%
 133 static int
 134 yylex (void)
 135 {
 136   static int called;
 137   if (called++)
 138     abort ();
 139   return EOF;
 140 }
 141
 142 static void
 143 yyerror (const char *msg)
 144 {
 145   fprintf (stderr, "%s\n", msg);
 146 }
 147
 148 int
 149 main (void)
 150 {
 151   return yyparse ();
 152 }
 153 ]])
 154
 155 AT_BISON_CHECK([-d -v -o input.c input.y], 0)
 156 AT_COMPILE([input])
 157 AT_PARSER_CHECK([./input], 0,
 158 [[15
 159 ]])
 160
 161 AT_CLEANUP
 162
 163
 164
 165 ## -------------------------- ##
 166 ## Printers and Destructors.  ##
 167 ## -------------------------- ##
 168
 169 # _AT_CHECK_PRINTER_AND_DESTRUCTOR($1, $2, $3, $4, BISON-DIRECTIVE, UNION-FLAG)
 170 # -----------------------------------------------------------------------------
 171 m4_define([_AT_CHECK_PRINTER_AND_DESTRUCTOR],
 172 [# Make sure complex $n work.
 173 m4_if([$1$2$3], $[1]$[2]$[3], [],
 174        [m4_fatal([$0: Invalid arguments: $@])])dnl
 175
 176 # Be sure to pass all the %directives to this macro to have correct
 177 # helping macros.  So don't put any directly in the Bison file.
 178 AT_BISON_OPTION_PUSHDEFS([$5])
 179 AT_DATA_GRAMMAR([[input.y]],
 180 [[%code requires {
 181 #include <stdio.h>
 182 #include <stdlib.h>
 183 #include <string.h>
 184 #include <assert.h>
 185
 186 #define YYINITDEPTH 10
 187 #define YYMAXDEPTH 10
 188 ]AT_LALR1_CC_IF(
 189   [#define RANGE(Location) (Location).begin.line, (Location).end.line],
 190   [#define RANGE(Location) (Location).first_line, (Location).last_line])
 191 [}
 192
 193 $5]
 194 m4_ifval([$6], [%union
 195 {
 196   int ival;
 197 }])
 198 AT_LALR1_CC_IF([%define global_tokens_and_yystype])
 199 m4_ifval([$6], [[%code provides {]], [[%code {]])
 200 AT_LALR1_CC_IF([typedef yy::location YYLTYPE;])
 201 [static int yylex (]AT_LEX_FORMALS[);
 202 ]AT_LALR1_CC_IF([], [static void yyerror (const char *msg);])
 203 [}
 204
 205 ]m4_ifval([$6], [%type <ival> '(' 'x' 'y' ')' ';' thing line input END])[
 206
 207 /* FIXME: This %printer isn't actually tested.  */
 208 %printer
 209   {
 210     ]AT_LALR1_CC_IF([debug_stream () << $$;],
 211                     [fprintf (yyoutput, "%d", $$)])[;
 212   }
 213   input line thing 'x' 'y'
 214
 215 %destructor
 216   { printf ("Freeing nterm input (%d@%d-%d)\n", $$, RANGE (@$)); }
 217   input
 218
 219 %destructor
 220   { printf ("Freeing nterm line (%d@%d-%d)\n", $$, RANGE (@$)); }
 221   line
 222
 223 %destructor
 224   { printf ("Freeing nterm thing (%d@%d-%d)\n", $$, RANGE (@$)); }
 225   thing
 226
 227 %destructor
 228   { printf ("Freeing token 'x' (%d@%d-%d)\n", $$, RANGE (@$)); }
 229   'x'
 230
 231 %destructor
 232   { printf ("Freeing token 'y' (%d@%d-%d)\n", $$, RANGE (@$)); }
 233   'y'
 234
 235 %token END 0
 236 %destructor
 237   { printf ("Freeing token END (%d@%d-%d)\n", $$, RANGE (@$)); }
 238   END
 239
 240 %%
 241 /*
 242    This grammar is made to exercise error recovery.
 243    "Lines" starting with `(' support error recovery, with
 244    ')' as synchronizing token.  Lines starting with 'x' can never
 245    be recovered from if in error.
 246 */
 247
 248 input:
 249   /* Nothing. */
 250     {
 251       $$ = 0;
 252       printf ("input (%d@%d-%d): /* Nothing */\n", $$, RANGE (@$));
 253     }
 254 | line input /* Right recursive to load the stack so that popping at
 255                 END can be exercised.  */
 256     {
 257       $$ = 2;
 258       printf ("input (%d@%d-%d): line (%d@%d-%d) input (%d@%d-%d)\n",
 259               $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2));
 260     }
 261 ;
 262
 263 line:
 264   thing thing thing ';'
 265     {
 266       $$ = $1;
 267       printf ("line (%d@%d-%d): thing (%d@%d-%d) thing (%d@%d-%d) thing (%d@%d-%d) ';' (%d@%d-%d)\n",
 268               $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2),
 269               $3, RANGE (@3), $4, RANGE (@4));
 270     }
 271 | '(' thing thing ')'
 272     {
 273       $$ = $1;
 274       printf ("line (%d@%d-%d): '(' (%d@%d-%d) thing (%d@%d-%d) thing (%d@%d-%d) ')' (%d@%d-%d)\n",
 275               $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2),
 276               $3, RANGE (@3), $4, RANGE (@4));
 277     }
 278 | '(' thing ')'
 279     {
 280       $$ = $1;
 281       printf ("line (%d@%d-%d): '(' (%d@%d-%d) thing (%d@%d-%d) ')' (%d@%d-%d)\n",
 282               $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2), $3, RANGE (@3));
 283     }
 284 | '(' error ')'
 285     {
 286       $$ = -1;
 287       printf ("line (%d@%d-%d): '(' (%d@%d-%d) error (@%d-%d) ')' (%d@%d-%d)\n",
 288               $$, RANGE (@$), $1, RANGE (@1), RANGE (@2), $3, RANGE (@3));
 289     }
 290 ;
 291
 292 thing:
 293   'x'
 294     {
 295       $$ = $1;
 296       printf ("thing (%d@%d-%d): 'x' (%d@%d-%d)\n",
 297               $$, RANGE (@$), $1, RANGE (@1));
 298     }
 299 ;
 300 %%
 301 /* Alias to ARGV[1]. */
 302 const char *source = 0;
 303
 304 static int
 305 yylex (]AT_LEX_FORMALS[)
 306 {
 307   static unsigned int counter = 0;
 308
 309   int c = ]AT_VAL[]m4_ifval([$6], [.ival])[ = counter++;
 310   /* As in BASIC, line numbers go from 10 to 10.  */
 311 ]AT_LALR1_CC_IF(
 312 [ AT_LOC.begin.line = AT_LOC.begin.column = 10 * c;
 313   AT_LOC.end.line = AT_LOC.end.column = AT_LOC.begin.line + 9;
 314 ],
 315 [ AT_LOC.first_line = AT_LOC.first_column = 10 * c;
 316   AT_LOC.last_line = AT_LOC.last_column = AT_LOC.first_line + 9;
 317 ])[
 318
 319   if (! (0 <= c && c <= strlen (source)))
 320     abort ();
 321   if (source[c])
 322     printf ("sending: '%c'", source[c]);
 323   else
 324     printf ("sending: END");
 325   printf (" (%d@%d-%d)\n", c, RANGE (]AT_LOC[));
 326   return source[c];
 327 }
 328
 329 ]AT_LALR1_CC_IF(
 330 [/* A C++ error reporting function. */
 331 void
 332 yy::parser::error (const location& l, const std::string& m)
 333 {
 334   printf ("%d-%d: %s\n", RANGE (l), m.c_str());
 335 }
 336
 337 static bool yydebug;
 338 int
 339 yyparse ()
 340 {
 341   yy::parser parser;
 342   parser.set_debug_level (yydebug);
 343   return parser.parse ();
 344 }
 345 ],
 346 [static void
 347 yyerror (const char *msg)
 348 {
 349   printf ("%d-%d: %s\n", RANGE (yylloc), msg);
 350 }])[
 351
 352 int
 353 main (int argc, const char *argv[])
 354 {
 355   int status;
 356   yydebug = !!getenv ("YYDEBUG");
 357   assert (argc == 2);
 358   source = argv[1];
 359   status = yyparse ();
 360   switch (status)
 361     {
 362       case 0: printf ("Successful parse.\n"); break;
 363       case 1: printf ("Parsing FAILED.\n"); break;
 364       default: printf ("Parsing FAILED (status %d).\n", status); break;
 365     }
 366   return status;
 367 }
 368 ]])
 369
 370 AT_FULL_COMPILE([input])
 371
 372
 373 # Check the location of "empty"
 374 # -----------------------------
 375 # I.e., epsilon-reductions, as in "(x)" which ends by reducing
 376 # an empty "line" nterm.
 377 # FIXME: This location is not satisfying.  Depend on the lookahead?
 378 AT_PARSER_CHECK([./input '(x)'], 0,
 379 [[sending: '(' (0@0-9)
 380 sending: 'x' (1@10-19)
 381 thing (1@10-19): 'x' (1@10-19)
 382 sending: ')' (2@20-29)
 383 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 384 sending: END (3@30-39)
 385 input (0@29-29): /* Nothing */
 386 input (2@0-29): line (0@0-29) input (0@29-29)
 387 Freeing token END (3@30-39)
 388 Freeing nterm input (2@0-29)
 389 Successful parse.
 390 ]])
 391
 392
 393 # Check locations in error recovery
 394 # ---------------------------------
 395 # '(y)' is an error, but can be recovered from.  But what's the location
 396 # of the error itself ('y'), and of the resulting reduction ('(error)').
 397 AT_PARSER_CHECK([./input '(y)'], 0,
 398 [[sending: '(' (0@0-9)
 399 sending: 'y' (1@10-19)
 400 10-19: syntax error, unexpected 'y', expecting 'x'
 401 Freeing token 'y' (1@10-19)
 402 sending: ')' (2@20-29)
 403 line (-1@0-29): '(' (0@0-9) error (@10-19) ')' (2@20-29)
 404 sending: END (3@30-39)
 405 input (0@29-29): /* Nothing */
 406 input (2@0-29): line (-1@0-29) input (0@29-29)
 407 Freeing token END (3@30-39)
 408 Freeing nterm input (2@0-29)
 409 Successful parse.
 410 ]])
 411
 412
 413 # Syntax errors caught by the parser
 414 # ----------------------------------
 415 # Exercise the discarding of stack top and input until `error'
 416 # can be reduced.
 417 #
 418 #     '(', 'x', 'x', 'x', 'x', 'x', ')',
 419 #
 420 # Load the stack and provoke an error that cannot be caught by the
 421 # grammar, to check that the stack is cleared.  And make sure the
 422 # lookahead is freed.
 423 #
 424 #     '(', 'x', ')',
 425 #     '(', 'x', ')',
 426 #     'y'
 427 AT_PARSER_CHECK([./input '(xxxxx)(x)(x)y'], 1,
 428 [[sending: '(' (0@0-9)
 429 sending: 'x' (1@10-19)
 430 thing (1@10-19): 'x' (1@10-19)
 431 sending: 'x' (2@20-29)
 432 thing (2@20-29): 'x' (2@20-29)
 433 sending: 'x' (3@30-39)
 434 30-39: syntax error, unexpected 'x', expecting ')'
 435 Freeing nterm thing (2@20-29)
 436 Freeing nterm thing (1@10-19)
 437 Freeing token 'x' (3@30-39)
 438 sending: 'x' (4@40-49)
 439 Freeing token 'x' (4@40-49)
 440 sending: 'x' (5@50-59)
 441 Freeing token 'x' (5@50-59)
 442 sending: ')' (6@60-69)
 443 line (-1@0-69): '(' (0@0-9) error (@10-59) ')' (6@60-69)
 444 sending: '(' (7@70-79)
 445 sending: 'x' (8@80-89)
 446 thing (8@80-89): 'x' (8@80-89)
 447 sending: ')' (9@90-99)
 448 line (7@70-99): '(' (7@70-79) thing (8@80-89) ')' (9@90-99)
 449 sending: '(' (10@100-109)
 450 sending: 'x' (11@110-119)
 451 thing (11@110-119): 'x' (11@110-119)
 452 sending: ')' (12@120-129)
 453 line (10@100-129): '(' (10@100-109) thing (11@110-119) ')' (12@120-129)
 454 sending: 'y' (13@130-139)
 455 input (0@129-129): /* Nothing */
 456 input (2@100-129): line (10@100-129) input (0@129-129)
 457 input (2@70-129): line (7@70-99) input (2@100-129)
 458 input (2@0-129): line (-1@0-69) input (2@70-129)
 459 130-139: syntax error, unexpected 'y', expecting END
 460 Freeing nterm input (2@0-129)
 461 Freeing token 'y' (13@130-139)
 462 Parsing FAILED.
 463 ]])
 464
 465
 466 # Syntax error caught by the parser where lookahead = END
 467 # --------------------------------------------------------
 468 # Load the stack and provoke an error that cannot be caught by the
 469 # grammar, to check that the stack is cleared.  And make sure the
 470 # lookahead is freed.
 471 #
 472 #     '(', 'x', ')',
 473 #     '(', 'x', ')',
 474 #     'x'
 475 AT_PARSER_CHECK([./input '(x)(x)x'], 1,
 476 [[sending: '(' (0@0-9)
 477 sending: 'x' (1@10-19)
 478 thing (1@10-19): 'x' (1@10-19)
 479 sending: ')' (2@20-29)
 480 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 481 sending: '(' (3@30-39)
 482 sending: 'x' (4@40-49)
 483 thing (4@40-49): 'x' (4@40-49)
 484 sending: ')' (5@50-59)
 485 line (3@30-59): '(' (3@30-39) thing (4@40-49) ')' (5@50-59)
 486 sending: 'x' (6@60-69)
 487 thing (6@60-69): 'x' (6@60-69)
 488 sending: END (7@70-79)
 489 70-79: syntax error, unexpected END, expecting 'x'
 490 Freeing nterm thing (6@60-69)
 491 Freeing nterm line (3@30-59)
 492 Freeing nterm line (0@0-29)
 493 Freeing token END (7@70-79)
 494 Parsing FAILED.
 495 ]])
 496
 497
 498 # Check destruction upon stack overflow
 499 # -------------------------------------
 500 # Upon stack overflow, all symbols on the stack should be destroyed.
 501 # Only check for yacc.c.
 502 AT_YACC_IF([
 503 AT_PARSER_CHECK([./input '(x)(x)(x)(x)(x)(x)(x)'], 2,
 504 [[sending: '(' (0@0-9)
 505 sending: 'x' (1@10-19)
 506 thing (1@10-19): 'x' (1@10-19)
 507 sending: ')' (2@20-29)
 508 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 509 sending: '(' (3@30-39)
 510 sending: 'x' (4@40-49)
 511 thing (4@40-49): 'x' (4@40-49)
 512 sending: ')' (5@50-59)
 513 line (3@30-59): '(' (3@30-39) thing (4@40-49) ')' (5@50-59)
 514 sending: '(' (6@60-69)
 515 sending: 'x' (7@70-79)
 516 thing (7@70-79): 'x' (7@70-79)
 517 sending: ')' (8@80-89)
 518 line (6@60-89): '(' (6@60-69) thing (7@70-79) ')' (8@80-89)
 519 sending: '(' (9@90-99)
 520 sending: 'x' (10@100-109)
 521 thing (10@100-109): 'x' (10@100-109)
 522 sending: ')' (11@110-119)
 523 line (9@90-119): '(' (9@90-99) thing (10@100-109) ')' (11@110-119)
 524 sending: '(' (12@120-129)
 525 sending: 'x' (13@130-139)
 526 thing (13@130-139): 'x' (13@130-139)
 527 sending: ')' (14@140-149)
 528 line (12@120-149): '(' (12@120-129) thing (13@130-139) ')' (14@140-149)
 529 sending: '(' (15@150-159)
 530 sending: 'x' (16@160-169)
 531 thing (16@160-169): 'x' (16@160-169)
 532 sending: ')' (17@170-179)
 533 line (15@150-179): '(' (15@150-159) thing (16@160-169) ')' (17@170-179)
 534 sending: '(' (18@180-189)
 535 sending: 'x' (19@190-199)
 536 thing (19@190-199): 'x' (19@190-199)
 537 sending: ')' (20@200-209)
 538 200-209: memory exhausted
 539 Freeing nterm thing (19@190-199)
 540 Freeing nterm line (15@150-179)
 541 Freeing nterm line (12@120-149)
 542 Freeing nterm line (9@90-119)
 543 Freeing nterm line (6@60-89)
 544 Freeing nterm line (3@30-59)
 545 Freeing nterm line (0@0-29)
 546 Parsing FAILED (status 2).
 547 ]])
 548 ])
 549
 550 ])
 551
 552
 553 # AT_CHECK_PRINTER_AND_DESTRUCTOR([BISON-OPTIONS], [UNION-FLAG], [SKIP_FLAG])
 554 # ---------------------------------------------------------------------------
 555 m4_define([AT_CHECK_PRINTER_AND_DESTRUCTOR],
 556 [AT_SETUP([Printers and Destructors $2: $1])
 557
 558 $3
 559 _AT_CHECK_PRINTER_AND_DESTRUCTOR($[1], $[2], $[3], $[4],
 560 [%error-verbose
 561 %debug
 562 %verbose
 563 %locations
 564 $1], [$2])
 565
 566 AT_CLEANUP
 567 ])
 568
 569
 570 AT_CHECK_PRINTER_AND_DESTRUCTOR([])
 571 AT_CHECK_PRINTER_AND_DESTRUCTOR([], [with union])
 572
 573 AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"])
 574 AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"], [with union])
 575
 576 AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser])
 577 AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser], [with union])
 578
 579
 580
 581 ## ----------------------------------------- ##
 582 ## Default tagless %printer and %destructor. ##
 583 ## ----------------------------------------- ##
 584
 585 # Check that the right %printer and %destructor are called, that they're not
 586 # called for $end, and that $$ and @$ work correctly.
 587
 588 AT_SETUP([Default tagless %printer and %destructor])
 589
 590 AT_DATA_GRAMMAR([[input.y]],
 591 [[%error-verbose
 592 %debug
 593 %locations
 594 %initial-action {
 595   @$.first_line = @$.last_line = 1;
 596   @$.first_column = @$.last_column = 1;
 597 }
 598
 599 %{
 600 # include <stdio.h>
 601 # include <stdlib.h>
 602   static void yyerror (const char *msg);
 603   static int yylex (void);
 604 # define USE(SYM)
 605 %}
 606
 607 %printer {
 608   fprintf (yyoutput, "<*> printer should not be called.\n");
 609 } <*>
 610
 611 %printer {
 612   fprintf (yyoutput, "<> printer for '%c' @ %d", $$, @$.first_column);
 613 } <>
 614 %destructor {
 615   fprintf (stdout, "<> destructor for '%c' @ %d.\n", $$, @$.first_column);
 616 } <>
 617
 618 %printer {
 619   fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);
 620 } 'b' 'c'
 621 %destructor {
 622   fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
 623 } 'b' 'c'
 624
 625 %destructor {
 626   fprintf (yyoutput, "<*> destructor should not be called.\n");
 627 } <*>
 628
 629 %%
 630
 631 start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
 632
 633 %%
 634
 635 static int
 636 yylex (void)
 637 {
 638   static char const input[] = "abcd";
 639   static size_t toknum;
 640   if (! (toknum < sizeof input))
 641     abort ();
 642   yylval = input[toknum++];
 643   yylloc.first_line = yylloc.last_line = 1;
 644   yylloc.first_column = yylloc.last_column = toknum;
 645   return yylval;
 646 }
 647
 648 static void
 649 yyerror (const char *msg)
 650 {
 651   fprintf (stderr, "%s\n", msg);
 652 }
 653
 654 int
 655 main (void)
 656 {
 657   yydebug = 1;
 658   return yyparse ();
 659 }
 660 ]])
 661
 662 AT_BISON_CHECK([-o input.c input.y])
 663 AT_COMPILE([input])
 664 AT_PARSER_CHECK([./input], 1,
 665 [[<> destructor for 'd' @ 4.
 666 'b'/'c' destructor for 'c' @ 3.
 667 'b'/'c' destructor for 'b' @ 2.
 668 <> destructor for 'a' @ 1.
 669 ]],
 670 [[Starting parse
 671 Entering state 0
 672 Reading a token: Next token is token 'a' (1.1-1.1: <> printer for 'a' @ 1)
 673 Shifting token 'a' (1.1-1.1: <> printer for 'a' @ 1)
 674 Entering state 1
 675 Reading a token: Next token is token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 676 Shifting token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 677 Entering state 3
 678 Reading a token: Next token is token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 679 Shifting token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 680 Entering state 5
 681 Reading a token: Next token is token 'd' (1.4-1.4: <> printer for 'd' @ 4)
 682 Shifting token 'd' (1.4-1.4: <> printer for 'd' @ 4)
 683 Entering state 6
 684 Reading a token: Now at end of input.
 685 syntax error, unexpected $end, expecting 'e'
 686 Error: popping token 'd' (1.4-1.4: <> printer for 'd' @ 4)
 687 Stack now 0 1 3 5
 688 Error: popping token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 689 Stack now 0 1 3
 690 Error: popping token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 691 Stack now 0 1
 692 Error: popping token 'a' (1.1-1.1: <> printer for 'a' @ 1)
 693 Stack now 0
 694 Cleanup: discarding lookahead token $end (1.5-1.5: )
 695 Stack now 0
 696 ]])
 697
 698 AT_CLEANUP
 699
 700
 701
 702 ## ------------------------------------------------------ ##
 703 ## Default tagged and per-type %printer and %destructor.  ##
 704 ## ------------------------------------------------------ ##
 705
 706 AT_SETUP([Default tagged and per-type %printer and %destructor])
 707
 708 AT_DATA_GRAMMAR([[input.y]],
 709 [[%error-verbose
 710 %debug
 711
 712 %{
 713 # include <stdio.h>
 714 # include <stdlib.h>
 715   static void yyerror (const char *msg);
 716   static int yylex (void);
 717 # define USE(SYM)
 718 %}
 719
 720 %printer {
 721   fprintf (yyoutput, "<> printer should not be called.\n");
 722 } <>
 723
 724 %union { int field0; int field1; int field2; }
 725 %type <field0> start 'a' 'g'
 726 %type <field1> 'e'
 727 %type <field2> 'f'
 728 %printer {
 729   fprintf (yyoutput, "<*>/<field2>/e printer");
 730 } <*> 'e' <field2>
 731 %destructor {
 732   fprintf (stdout, "<*>/<field2>/e destructor.\n");
 733 } <*> 'e' <field2>
 734
 735 %type <field1> 'b'
 736 %printer { fprintf (yyoutput, "<field1> printer"); } <field1>
 737 %destructor { fprintf (stdout, "<field1> destructor.\n"); } <field1>
 738
 739 %type <field0> 'c'
 740 %printer { fprintf (yyoutput, "'c' printer"); } 'c'
 741 %destructor { fprintf (stdout, "'c' destructor.\n"); } 'c'
 742
 743 %type <field1> 'd'
 744 %printer { fprintf (yyoutput, "'d' printer"); } 'd'
 745 %destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
 746
 747 %destructor {
 748   fprintf (yyoutput, "<> destructor should not be called.\n");
 749 } <>
 750
 751 %%
 752
 753 start:
 754   'a' 'b' 'c' 'd' 'e' 'f' 'g'
 755     {
 756       USE(($1, $2, $3, $4, $5, $6, $7));
 757       $$ = 'S';
 758     }
 759   ;
 760
 761 %%
 762
 763 static int
 764 yylex (void)
 765 {
 766   static char const input[] = "abcdef";
 767   static size_t toknum;
 768   if (! (toknum < sizeof input))
 769     abort ();
 770   return input[toknum++];
 771 }
 772
 773 static void
 774 yyerror (const char *msg)
 775 {
 776   fprintf (stderr, "%s\n", msg);
 777 }
 778
 779 int
 780 main (void)
 781 {
 782   yydebug = 1;
 783   return yyparse ();
 784 }
 785 ]])
 786
 787 AT_BISON_CHECK([-o input.c input.y])
 788 AT_COMPILE([input])
 789 AT_PARSER_CHECK([./input], 1,
 790 [[<*>/<field2>/e destructor.
 791 <*>/<field2>/e destructor.
 792 'd' destructor.
 793 'c' destructor.
 794 <field1> destructor.
 795 <*>/<field2>/e destructor.
 796 ]],
 797 [[Starting parse
 798 Entering state 0
 799 Reading a token: Next token is token 'a' (<*>/<field2>/e printer)
 800 Shifting token 'a' (<*>/<field2>/e printer)
 801 Entering state 1
 802 Reading a token: Next token is token 'b' (<field1> printer)
 803 Shifting token 'b' (<field1> printer)
 804 Entering state 3
 805 Reading a token: Next token is token 'c' ('c' printer)
 806 Shifting token 'c' ('c' printer)
 807 Entering state 5
 808 Reading a token: Next token is token 'd' ('d' printer)
 809 Shifting token 'd' ('d' printer)
 810 Entering state 6
 811 Reading a token: Next token is token 'e' (<*>/<field2>/e printer)
 812 Shifting token 'e' (<*>/<field2>/e printer)
 813 Entering state 7
 814 Reading a token: Next token is token 'f' (<*>/<field2>/e printer)
 815 Shifting token 'f' (<*>/<field2>/e printer)
 816 Entering state 8
 817 Reading a token: Now at end of input.
 818 syntax error, unexpected $end, expecting 'g'
 819 Error: popping token 'f' (<*>/<field2>/e printer)
 820 Stack now 0 1 3 5 6 7
 821 Error: popping token 'e' (<*>/<field2>/e printer)
 822 Stack now 0 1 3 5 6
 823 Error: popping token 'd' ('d' printer)
 824 Stack now 0 1 3 5
 825 Error: popping token 'c' ('c' printer)
 826 Stack now 0 1 3
 827 Error: popping token 'b' (<field1> printer)
 828 Stack now 0 1
 829 Error: popping token 'a' (<*>/<field2>/e printer)
 830 Stack now 0
 831 Cleanup: discarding lookahead token $end ()
 832 Stack now 0
 833 ]])
 834
 835 AT_CLEANUP
 836
 837
 838
 839 ## ------------------------------------------------------------- ##
 840 ## Default %printer and %destructor for user-defined end token.  ##
 841 ## ------------------------------------------------------------- ##
 842
 843 AT_SETUP([Default %printer and %destructor for user-defined end token])
 844
 845 # _AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(TYPED)
 846 # -----------------------------------------------------------------------------
 847 m4_define([_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN],
 848 [m4_if($1, 0,
 849   [m4_pushdef([kind], []) m4_pushdef([not_kind], [*])],
 850   [m4_pushdef([kind], [*]) m4_pushdef([not_kind], [])])
 851
 852 AT_DATA_GRAMMAR([[input]]$1[[.y]],
 853 [[%error-verbose
 854 %debug
 855 %locations
 856 %initial-action {
 857   @$.first_line = @$.last_line = 1;
 858   @$.first_column = @$.last_column = 1;
 859 }
 860
 861 %{
 862 # include <stdio.h>
 863 # include <stdlib.h>
 864   static void yyerror (const char *msg);
 865   static int yylex (void);
 866 # define USE(SYM)
 867 %}
 868
 869 %destructor {
 870   fprintf (yyoutput, "<]]not_kind[[> destructor should not be called.\n");
 871 } <]]not_kind[[>
 872
 873 %token END 0
 874 %printer {
 875   fprintf (yyoutput, "<]]kind[[> for '%c' @ %d", $$, @$.first_column);
 876 } <]]kind[[>
 877 %destructor {
 878   fprintf (stdout, "<]]kind[[> for '%c' @ %d.\n", $$, @$.first_column);
 879 } <]]kind[[>
 880
 881 %printer {
 882   fprintf (yyoutput, "<]]not_kind[[> printer should not be called.\n");
 883 } <]]not_kind[[>
 884
 885 ]]m4_if($1, 0, [[[
 886 ]]],
 887 [[[%union { char tag; }
 888 %type <tag> start END]]])[[
 889
 890 %%
 891
 892 start: { $$ = 'S'; } ;
 893
 894 %%
 895
 896 static int
 897 yylex (void)
 898 {
 899   static int called;
 900   if (called++)
 901     abort ();
 902   yylval]]m4_if($1, 0,, [[[.tag]]])[[ = 'E';
 903   yylloc.first_line = yylloc.last_line = 1;
 904   yylloc.first_column = yylloc.last_column = 1;
 905   return 0;
 906 }
 907
 908 static void
 909 yyerror (const char *msg)
 910 {
 911   fprintf (stderr, "%s\n", msg);
 912 }
 913
 914 int
 915 main (void)
 916 {
 917   yydebug = 1;
 918   return yyparse ();
 919 }
 920 ]])
 921
 922 AT_BISON_CHECK([-o input$1.c input$1.y])
 923 AT_COMPILE([input$1])
 924 AT_PARSER_CHECK([./input$1], 0,
 925 [[<]]kind[[> for 'E' @ 1.
 926 <]]kind[[> for 'S' @ 1.
 927 ]],
 928 [[Starting parse
 929 Entering state 0
 930 Reducing stack by rule 1 (line 46):
 931 -> $$ = nterm start (1.1-1.1: <]]kind[[> for 'S' @ 1)
 932 Stack now 0
 933 Entering state 1
 934 Reading a token: Now at end of input.
 935 Shifting token END (1.1-1.1: <]]kind[[> for 'E' @ 1)
 936 Entering state 2
 937 Stack now 0 1 2
 938 Cleanup: popping token END (1.1-1.1: <]]kind[[> for 'E' @ 1)
 939 Cleanup: popping nterm start (1.1-1.1: <]]kind[[> for 'S' @ 1)
 940 ]])
 941
 942 m4_popdef([kind])
 943 m4_popdef([not_kind])
 944 ])
 945
 946 _AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(0)
 947 _AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(1)
 948
 949 AT_CLEANUP
 950
 951
 952
 953 ## ------------------------------------------------------------------ ##
 954 ## Default %printer and %destructor are not for error or $undefined.  ##
 955 ## ------------------------------------------------------------------ ##
 956
 957 AT_SETUP([Default %printer and %destructor are not for error or $undefined])
 958
 959 # If Bison were to apply the default %printer and %destructor to the error
 960 # token or to $undefined:
 961 #   - For the error token:
 962 #     - It would generate warnings for unused $n.
 963 #     - It would invoke the %printer and %destructor on the error token's
 964 #       semantic value, which would be initialized from the lookahead, which
 965 #       would be destroyed separately.
 966 #   - For $undefined, who knows what the semantic value would be.
 967
 968 AT_DATA_GRAMMAR([[input.y]],
 969 [[%debug
 970
 971 %{
 972 # include <stdio.h>
 973 # include <stdlib.h>
 974   static void yyerror (const char *msg);
 975   static int yylex (void);
 976 # define USE(SYM)
 977 %}
 978
 979 %printer {
 980   fprintf (yyoutput, "'%c'", $$);
 981 } <> <*>
 982 %destructor {
 983   fprintf (stderr, "DESTROY '%c'\n", $$);
 984 } <> <*>
 985
 986 %%
 987
 988 start:
 989   { $$ = 'S'; }
 990   /* In order to reveal the problems that this bug caused during parsing, add
 991    * $2 to USE.  */
 992   | 'a' error 'b' 'c' { USE(($1, $3, $4)); $$ = 'S'; }
 993   ;
 994
 995 %%
 996
 997 static int
 998 yylex (void)
 999 {
1000   static char const input[] = "abd";
1001   static size_t toknum;
1002   if (! (toknum < sizeof input))
1003     abort ();
1004   yylval = input[toknum++];
1005   return yylval;
1006 }
1007
1008 static void
1009 yyerror (const char *msg)
1010 {
1011   fprintf (stderr, "%s\n", msg);
1012 }
1013
1014 int
1015 main (void)
1016 {
1017   yydebug = 1;
1018   return yyparse ();
1019 }
1020 ]])
1021
1022 AT_BISON_CHECK([-o input.c input.y])
1023 AT_COMPILE([input])
1024 AT_PARSER_CHECK([./input], [1], [],
1025 [[Starting parse
1026 Entering state 0
1027 Reading a token: Next token is token 'a' ('a')
1028 Shifting token 'a' ('a')
1029 Entering state 1
1030 Reading a token: Next token is token 'b' ('b')
1031 syntax error
1032 Shifting token error ()
1033 Entering state 3
1034 Next token is token 'b' ('b')
1035 Shifting token 'b' ('b')
1036 Entering state 5
1037 Reading a token: Next token is token $undefined ()
1038 Error: popping token 'b' ('b')
1039 DESTROY 'b'
1040 Stack now 0 1 3
1041 Error: popping token error ()
1042 Stack now 0 1
1043 Shifting token error ()
1044 Entering state 3
1045 Next token is token $undefined ()
1046 Error: discarding token $undefined ()
1047 Error: popping token error ()
1048 Stack now 0 1
1049 Shifting token error ()
1050 Entering state 3
1051 Reading a token: Now at end of input.
1052 Cleanup: discarding lookahead token $end ()
1053 Stack now 0 1 3
1054 Cleanup: popping token error ()
1055 Cleanup: popping token 'a' ('a')
1056 DESTROY 'a'
1057 ]])
1058
1059 AT_CLEANUP
1060
1061
1062
1063 ## ------------------------------------------------------ ##
1064 ## Default %printer and %destructor are not for $accept.  ##
1065 ## ------------------------------------------------------ ##
1066
1067 AT_SETUP([Default %printer and %destructor are not for $accept])
1068
1069 # If YYSTYPE is a union and Bison were to apply the default %printer and
1070 # %destructor to $accept:
1071 #   - The %printer and %destructor code generated for $accept would always be
1072 #     dead code because $accept is currently never shifted onto the stack.
1073 #   - $$ for $accept would always be of type YYSTYPE because it's not possible
1074 #     to declare `%type <field> $accept'.  (Also true for $undefined.)
1075 #   - Thus, the compiler might complain that the user code assumes the wrong
1076 #     type for $$ since the code might assume the type associated with a
1077 #     specific union field, which is especially reasonable in C++ since that
1078 #     type may be a base type.  This test case checks for this problem.  (Also
1079 #     true for $undefined and the error token, so there are three warnings for
1080 #     %printer and three for %destructor.)
1081
1082 AT_DATA_GRAMMAR([[input.y]],
1083 [[%debug /* So that %printer is actually compiled.  */
1084
1085 %{
1086 # include <stdio.h>
1087 # include <stdlib.h>
1088   static void yyerror (const char *msg);
1089   static int yylex (void);
1090 # define USE(SYM)
1091 %}
1092
1093 %printer {
1094   char chr = $$;
1095   fprintf (yyoutput, "'%c'", chr);
1096 } <> <*>
1097 %destructor {
1098   char chr = $$;
1099   fprintf (stderr, "DESTROY '%c'\n", chr);
1100 } <> <*>
1101
1102 %union { char chr; }
1103 %type <chr> start
1104
1105 %%
1106
1107 start: { USE($$); } ;
1108
1109 %%
1110
1111 static int
1112 yylex (void)
1113 {
1114   static int called;
1115   if (called++)
1116     abort ();
1117   return 0;
1118 }
1119
1120 static void
1121 yyerror (const char *msg)
1122 {
1123   fprintf (stderr, "%s\n", msg);
1124 }
1125
1126 int
1127 main (void)
1128 {
1129   return yyparse ();
1130 }
1131 ]])
1132
1133 AT_BISON_CHECK([-o input.c input.y])
1134 AT_COMPILE([input])
1135
1136 AT_CLEANUP
1137
1138
1139
1140 ## ------------------------------------------------------ ##
1141 ## Default %printer and %destructor for mid-rule values.  ##
1142 ## ------------------------------------------------------ ##
1143
1144 AT_SETUP([Default %printer and %destructor for mid-rule values])
1145
1146 AT_DATA_GRAMMAR([[input.y]],
1147 [[%debug /* So that %printer is actually compiled.  */
1148
1149 %{
1150 # include <stdio.h>
1151 # include <stdlib.h>
1152   static void yyerror (const char *msg);
1153   static int yylex (void);
1154 # define USE(SYM)
1155 # define YYLTYPE int
1156 # define YYLLOC_DEFAULT(Current, Rhs, N)
1157 # define YY_LOCATION_PRINT(File, Loc)
1158 %}
1159
1160 %printer { fprintf (yyoutput, "%d", @$); } <>
1161 %destructor { fprintf (stderr, "DESTROY %d\n", @$); } <>
1162 %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1163 %destructor { fprintf (yyoutput, "<*> destructor should not be called"); } <*>
1164
1165 %%
1166
1167 start:
1168   {           @$ = 1; } // Not set or used.
1169   { USE ($$); @$ = 2; } // Both set and used.
1170   { USE ($$); @$ = 3; } // Only set.
1171   {           @$ = 4; } // Only used.
1172   'c'
1173   { USE (($$, $2, $4, $5)); @$ = 0; }
1174   ;
1175
1176 %%
1177
1178 static int
1179 yylex (void)
1180 {
1181   static int called;
1182   if (called++)
1183     abort ();
1184   return 0;
1185 }
1186
1187 static void
1188 yyerror (const char *msg)
1189 {
1190   fprintf (stderr, "%s\n", msg);
1191 }
1192
1193 int
1194 main (void)
1195 {
1196   yydebug = 1;
1197   return yyparse ();
1198 }
1199 ]])
1200
1201 AT_BISON_CHECK([-o input.c input.y], 0,,
1202 [[input.y:33.3-23: warning: unset value: $$
1203 input.y:30.3-35.37: warning: unused value: $3
1204 ]])
1205
1206 AT_COMPILE([input])
1207 AT_PARSER_CHECK([./input], 1,,
1208 [[Starting parse
1209 Entering state 0
1210 Reducing stack by rule 1 (line 30):
1211 -> $$ = nterm $@1 (: )
1212 Stack now 0
1213 Entering state 2
1214 Reducing stack by rule 2 (line 31):
1215 -> $$ = nterm @2 (: 2)
1216 Stack now 0 2
1217 Entering state 4
1218 Reducing stack by rule 3 (line 32):
1219 -> $$ = nterm @3 (: 3)
1220 Stack now 0 2 4
1221 Entering state 5
1222 Reducing stack by rule 4 (line 33):
1223 -> $$ = nterm @4 (: 4)
1224 Stack now 0 2 4 5
1225 Entering state 6
1226 Reading a token: Now at end of input.
1227 syntax error
1228 Error: popping nterm @4 (: 4)
1229 DESTROY 4
1230 Stack now 0 2 4 5
1231 Error: popping nterm @3 (: 3)
1232 DESTROY 3
1233 Stack now 0 2 4
1234 Error: popping nterm @2 (: 2)
1235 DESTROY 2
1236 Stack now 0 2
1237 Error: popping nterm $@1 (: )
1238 Stack now 0
1239 Cleanup: discarding lookahead token $end (: )
1240 Stack now 0
1241 ]])
1242
1243 AT_CLEANUP
1244
1245
1246 ## ----------------------- ##
1247 ## @$ implies %locations.  ##
1248 ## ----------------------- ##
1249
1250 # Bison once forgot to check for @$ in actions other than semantic actions.
1251
1252 # AT_CHECK_ACTION_LOCATIONS(ACTION-DIRECTIVE)
1253 # -------------------------------------------------------
1254 m4_define([AT_CHECK_ACTION_LOCATIONS],
1255 [AT_SETUP([[@$ in ]$1[ implies %locations]])
1256
1257 AT_DATA_GRAMMAR([[input.y]],
1258 [[%code {
1259   #include <stdio.h>
1260   static int yylex (void);
1261   static void yyerror (char const *msg);
1262 }
1263
1264 %debug
1265
1266 ]$1[ {
1267   printf ("%d\n", @$.first_line);
1268 } ]m4_if($1, [%initial-action], [], [[start]])[
1269
1270 %%
1271
1272 start:  ;
1273
1274 %%
1275
1276 static int
1277 yylex (void)
1278 {
1279   return 0;
1280 }
1281
1282 static void
1283 yyerror (char const *msg)
1284 {
1285   fprintf (stderr, "%s\n", msg);
1286 }
1287
1288 int
1289 main (void)
1290 {
1291   return yyparse ();
1292 }
1293 ]])
1294
1295 AT_BISON_CHECK([[-o input.c input.y]])
1296 AT_COMPILE([[input]])
1297
1298 AT_CLEANUP])
1299
1300 AT_CHECK_ACTION_LOCATIONS([[%initial-action]])
1301 AT_CHECK_ACTION_LOCATIONS([[%destructor]])
1302 AT_CHECK_ACTION_LOCATIONS([[%printer]])