tests/actions.at

   1 # Executing Actions.                               -*- Autotest -*-
   2
   3 # Copyright (C) 2001-2012 Free Software 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_BISON_OPTION_PUSHDEFS
  32 AT_DATA_GRAMMAR([[input.y]],
  33 [[%error-verbose
  34 %debug
  35 %{
  36 ]AT_YYERROR_DECLARE[
  37 ]AT_YYLEX_DECLARE[
  38 %}
  39 %%
  40 exp:     { putchar ('0'); }
  41      '1' { putchar ('1'); }
  42      '2' { putchar ('2'); }
  43      '3' { putchar ('3'); }
  44      '4' { putchar ('4'); }
  45      '5' { putchar ('5'); }
  46      '6' { putchar ('6'); }
  47      '7' { putchar ('7'); }
  48      '8' { putchar ('8'); }
  49      '9' { putchar ('9'); }
  50          { putchar ('\n'); }
  51    ;
  52 %%
  53 ]AT_YYERROR_DEFINE[
  54 ]AT_YYLEX_DEFINE(123456789)[
  55 int
  56 main (void)
  57 {
  58   return yyparse ();
  59 }
  60 ]])
  61 AT_BISON_OPTION_POPDEFS
  62
  63 AT_BISON_CHECK([-d -v -o input.c input.y])
  64 AT_COMPILE([input])
  65 AT_PARSER_CHECK([./input], 0,
  66 [[0123456789
  67 ]])
  68
  69 AT_CLEANUP
  70
  71
  72
  73
  74
  75 ## ---------------- ##
  76 ## Exotic Dollars.  ##
  77 ## ---------------- ##
  78
  79 AT_SETUP([Exotic Dollars])
  80
  81 AT_BISON_OPTION_PUSHDEFS
  82 AT_DATA_GRAMMAR([[input.y]],
  83 [[%error-verbose
  84 %debug
  85 %{
  86 ]AT_YYERROR_DECLARE[
  87 ]AT_YYLEX_DECLARE[
  88 # define USE(Var)
  89 %}
  90
  91 %union
  92 {
  93   int val;
  94 };
  95
  96 %type <val> a_1 a_2 a_5
  97             sum_of_the_five_previous_values
  98
  99 %%
 100 exp: a_1 a_2 { $<val>$ = 3; } { $<val>$ = $<val>3 + 1; } a_5
 101      sum_of_the_five_previous_values
 102     {
 103        USE (($1, $2, $<foo>3, $<foo>4, $5));
 104        printf ("%d\n", $6);
 105     }
 106 ;
 107 a_1: { $$ = 1; };
 108 a_2: { $$ = 2; };
 109 a_5: { $$ = 5; };
 110
 111 sum_of_the_five_previous_values:
 112     {
 113        $$ = $<val>0 + $<val>-1 + $<val>-2 + $<val>-3 + $<val>-4;
 114     }
 115 ;
 116
 117 %%
 118 ]AT_YYERROR_DEFINE[
 119 ]AT_YYLEX_DEFINE([])[
 120 int
 121 main (void)
 122 {
 123   return yyparse ();
 124 }
 125 ]])
 126
 127 AT_BISON_CHECK([-d -v -o input.c input.y], 0)
 128 AT_COMPILE([input])
 129 AT_PARSER_CHECK([./input], 0,
 130 [[15
 131 ]])
 132
 133 # Make sure that fields after $n or $-n are parsed correctly.  At one
 134 # point while implementing dashes in symbol names, we were dropping
 135 # fields after $-n.
 136 AT_DATA_GRAMMAR([[input.y]],
 137 [[
 138 %{
 139 #include <stdio.h>
 140 ]AT_YYERROR_DECLARE[
 141 ]AT_YYLEX_DECLARE[
 142   typedef struct { int val; } stype;
 143 # define YYSTYPE stype
 144 %}
 145
 146 %%
 147 start: one two { $$.val = $1.val + $2.val; } sum ;
 148 one: { $$.val = 1; } ;
 149 two: { $$.val = 2; } ;
 150 sum: { printf ("%d\n", $0.val + $-1.val + $-2.val); } ;
 151
 152 %%
 153
 154 static int
 155 yylex (void)
 156 {
 157   return 0;
 158 }
 159
 160 ]AT_YYERROR_DEFINE[
 161 int
 162 main (void)
 163 {
 164   return yyparse ();
 165 }
 166 ]])
 167
 168 AT_BISON_CHECK([[-o input.c input.y]])
 169 AT_COMPILE([[input]])
 170 AT_PARSER_CHECK([[./input]], [[0]],
 171 [[6
 172 ]])
 173
 174 AT_BISON_OPTION_POPDEFS
 175 AT_CLEANUP
 176
 177
 178
 179 ## -------------------------- ##
 180 ## Printers and Destructors.  ##
 181 ## -------------------------- ##
 182
 183 # _AT_CHECK_PRINTER_AND_DESTRUCTOR($1, $2, $3, $4, BISON-DIRECTIVE, UNION-FLAG)
 184 # -----------------------------------------------------------------------------
 185 m4_define([_AT_CHECK_PRINTER_AND_DESTRUCTOR],
 186 [# Make sure complex $n work.
 187 m4_if([$1$2$3], $[1]$[2]$[3], [],
 188        [m4_fatal([$0: Invalid arguments: $@])])dnl
 189
 190 # Be sure to pass all the %directives to this macro to have correct
 191 # helping macros.  So don't put any directly in the Bison file.
 192 AT_BISON_OPTION_PUSHDEFS([$5])
 193 AT_DATA_GRAMMAR([[input.y]],
 194 [[%code requires {
 195 #include <stdio.h>
 196 #include <stdlib.h>
 197 #include <string.h>
 198 #include <assert.h>
 199
 200 #define YYINITDEPTH 10
 201 #define YYMAXDEPTH 10
 202 ]AT_LALR1_CC_IF(
 203   [#define RANGE(Location) (Location).begin.line, (Location).end.line],
 204   [#define RANGE(Location) (Location).first_line, (Location).last_line])
 205 [}
 206
 207 $5]
 208 m4_ifval([$6], [%union
 209 {
 210   int ival;
 211 }])
 212 AT_LALR1_CC_IF([%define global_tokens_and_yystype])
 213 m4_ifval([$6], [[%code provides {]], [[%code {]])
 214 AT_LALR1_CC_IF([typedef yy::location YYLTYPE;])
 215 [static int yylex (]AT_LEX_FORMALS[);
 216 ]AT_LALR1_CC_IF([], [AT_YYERROR_DECLARE])
 217 [}
 218
 219 ]m4_ifval([$6], [%type <ival> '(' 'x' 'y' ')' ';' thing line input END])[
 220
 221 /* FIXME: This %printer isn't actually tested.  */
 222 %printer
 223   {
 224     ]AT_LALR1_CC_IF([debug_stream () << $$;],
 225                     [fprintf (yyoutput, "%d", $$)])[;
 226   }
 227   input line thing 'x' 'y'
 228
 229 %destructor
 230   { printf ("Freeing nterm input (%d@%d-%d)\n", $$, RANGE (@$)); }
 231   input
 232
 233 %destructor
 234   { printf ("Freeing nterm line (%d@%d-%d)\n", $$, RANGE (@$)); }
 235   line
 236
 237 %destructor
 238   { printf ("Freeing nterm thing (%d@%d-%d)\n", $$, RANGE (@$)); }
 239   thing
 240
 241 %destructor
 242   { printf ("Freeing token 'x' (%d@%d-%d)\n", $$, RANGE (@$)); }
 243   'x'
 244
 245 %destructor
 246   { printf ("Freeing token 'y' (%d@%d-%d)\n", $$, RANGE (@$)); }
 247   'y'
 248
 249 %token END 0
 250 %destructor
 251   { printf ("Freeing token END (%d@%d-%d)\n", $$, RANGE (@$)); }
 252   END
 253
 254 %%
 255 /*
 256    This grammar is made to exercise error recovery.
 257    "Lines" starting with `(' support error recovery, with
 258    ')' as synchronizing token.  Lines starting with 'x' can never
 259    be recovered from if in error.
 260 */
 261
 262 input:
 263   /* Nothing. */
 264     {
 265       $$ = 0;
 266       printf ("input (%d@%d-%d): /* Nothing */\n", $$, RANGE (@$));
 267     }
 268 | line input /* Right recursive to load the stack so that popping at
 269                 END can be exercised.  */
 270     {
 271       $$ = 2;
 272       printf ("input (%d@%d-%d): line (%d@%d-%d) input (%d@%d-%d)\n",
 273               $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2));
 274     }
 275 ;
 276
 277 line:
 278   thing thing thing ';'
 279     {
 280       $$ = $1;
 281       printf ("line (%d@%d-%d): thing (%d@%d-%d) thing (%d@%d-%d) thing (%d@%d-%d) ';' (%d@%d-%d)\n",
 282               $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2),
 283               $3, RANGE (@3), $4, RANGE (@4));
 284     }
 285 | '(' thing thing ')'
 286     {
 287       $$ = $1;
 288       printf ("line (%d@%d-%d): '(' (%d@%d-%d) thing (%d@%d-%d) thing (%d@%d-%d) ')' (%d@%d-%d)\n",
 289               $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2),
 290               $3, RANGE (@3), $4, RANGE (@4));
 291     }
 292 | '(' thing ')'
 293     {
 294       $$ = $1;
 295       printf ("line (%d@%d-%d): '(' (%d@%d-%d) thing (%d@%d-%d) ')' (%d@%d-%d)\n",
 296               $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2), $3, RANGE (@3));
 297     }
 298 | '(' error ')'
 299     {
 300       $$ = -1;
 301       printf ("line (%d@%d-%d): '(' (%d@%d-%d) error (@%d-%d) ')' (%d@%d-%d)\n",
 302               $$, RANGE (@$), $1, RANGE (@1), RANGE (@2), $3, RANGE (@3));
 303     }
 304 ;
 305
 306 thing:
 307   'x'
 308     {
 309       $$ = $1;
 310       printf ("thing (%d@%d-%d): 'x' (%d@%d-%d)\n",
 311               $$, RANGE (@$), $1, RANGE (@1));
 312     }
 313 ;
 314 %%
 315 /* Alias to ARGV[1]. */
 316 const char *source = YY_NULL;
 317
 318 static int
 319 yylex (]AT_LEX_FORMALS[)
 320 {
 321   static unsigned int counter = 0;
 322
 323   int c = ]AT_VAL[]m4_ifval([$6], [.ival])[ = counter++;
 324   /* As in BASIC, line numbers go from 10 to 10.  */
 325 ]AT_LALR1_CC_IF(
 326 [ AT_LOC.begin.line = AT_LOC.begin.column = 10 * c;
 327   AT_LOC.end.line = AT_LOC.end.column = AT_LOC.begin.line + 9;
 328 ],
 329 [ AT_LOC.first_line = AT_LOC.first_column = 10 * c;
 330   AT_LOC.last_line = AT_LOC.last_column = AT_LOC.first_line + 9;
 331 ])[
 332
 333   if (! (0 <= c && c <= strlen (source)))
 334     abort ();
 335   if (source[c])
 336     printf ("sending: '%c'", source[c]);
 337   else
 338     printf ("sending: END");
 339   printf (" (%d@%d-%d)\n", c, RANGE (]AT_LOC[));
 340   return source[c];
 341 }
 342
 343 ]AT_LALR1_CC_IF(
 344 [/* A C++ error reporting function. */
 345 void
 346 yy::parser::error (const location& l, const std::string& m)
 347 {
 348   printf ("%d-%d: %s\n", RANGE (l), m.c_str());
 349 }
 350
 351 static bool yydebug;
 352 int
 353 yyparse ()
 354 {
 355   yy::parser parser;
 356   parser.set_debug_level (yydebug);
 357   return parser.parse ();
 358 }
 359 ],
 360 [static void
 361 yyerror (const char *msg)
 362 {
 363   printf ("%d-%d: %s\n", RANGE (yylloc), msg);
 364 }])[
 365
 366 int
 367 main (int argc, const char *argv[])
 368 {
 369   int status;
 370   yydebug = !!getenv ("YYDEBUG");
 371   assert (argc == 2);
 372   source = argv[1];
 373   status = yyparse ();
 374   switch (status)
 375     {
 376       case 0: printf ("Successful parse.\n"); break;
 377       case 1: printf ("Parsing FAILED.\n"); break;
 378       default: printf ("Parsing FAILED (status %d).\n", status); break;
 379     }
 380   return status;
 381 }
 382 ]])
 383
 384 AT_FULL_COMPILE([input])
 385
 386
 387 # Check the location of "empty"
 388 # -----------------------------
 389 # I.e., epsilon-reductions, as in "(x)" which ends by reducing
 390 # an empty "line" nterm.
 391 # FIXME: This location is not satisfying.  Depend on the lookahead?
 392 AT_PARSER_CHECK([./input '(x)'], 0,
 393 [[sending: '(' (0@0-9)
 394 sending: 'x' (1@10-19)
 395 thing (1@10-19): 'x' (1@10-19)
 396 sending: ')' (2@20-29)
 397 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 398 sending: END (3@30-39)
 399 input (0@29-29): /* Nothing */
 400 input (2@0-29): line (0@0-29) input (0@29-29)
 401 Freeing token END (3@30-39)
 402 Freeing nterm input (2@0-29)
 403 Successful parse.
 404 ]])
 405
 406
 407 # Check locations in error recovery
 408 # ---------------------------------
 409 # '(y)' is an error, but can be recovered from.  But what's the location
 410 # of the error itself ('y'), and of the resulting reduction ('(error)').
 411 AT_PARSER_CHECK([./input '(y)'], 0,
 412 [[sending: '(' (0@0-9)
 413 sending: 'y' (1@10-19)
 414 10-19: syntax error, unexpected 'y', expecting 'x'
 415 Freeing token 'y' (1@10-19)
 416 sending: ')' (2@20-29)
 417 line (-1@0-29): '(' (0@0-9) error (@10-19) ')' (2@20-29)
 418 sending: END (3@30-39)
 419 input (0@29-29): /* Nothing */
 420 input (2@0-29): line (-1@0-29) input (0@29-29)
 421 Freeing token END (3@30-39)
 422 Freeing nterm input (2@0-29)
 423 Successful parse.
 424 ]])
 425
 426
 427 # Syntax errors caught by the parser
 428 # ----------------------------------
 429 # Exercise the discarding of stack top and input until `error'
 430 # can be reduced.
 431 #
 432 #     '(', 'x', 'x', 'x', 'x', 'x', ')',
 433 #
 434 # Load the stack and provoke an error that cannot be caught by the
 435 # grammar, to check that the stack is cleared.  And make sure the
 436 # lookahead is freed.
 437 #
 438 #     '(', 'x', ')',
 439 #     '(', 'x', ')',
 440 #     'y'
 441 AT_PARSER_CHECK([./input '(xxxxx)(x)(x)y'], 1,
 442 [[sending: '(' (0@0-9)
 443 sending: 'x' (1@10-19)
 444 thing (1@10-19): 'x' (1@10-19)
 445 sending: 'x' (2@20-29)
 446 thing (2@20-29): 'x' (2@20-29)
 447 sending: 'x' (3@30-39)
 448 30-39: syntax error, unexpected 'x', expecting ')'
 449 Freeing nterm thing (2@20-29)
 450 Freeing nterm thing (1@10-19)
 451 Freeing token 'x' (3@30-39)
 452 sending: 'x' (4@40-49)
 453 Freeing token 'x' (4@40-49)
 454 sending: 'x' (5@50-59)
 455 Freeing token 'x' (5@50-59)
 456 sending: ')' (6@60-69)
 457 line (-1@0-69): '(' (0@0-9) error (@10-59) ')' (6@60-69)
 458 sending: '(' (7@70-79)
 459 sending: 'x' (8@80-89)
 460 thing (8@80-89): 'x' (8@80-89)
 461 sending: ')' (9@90-99)
 462 line (7@70-99): '(' (7@70-79) thing (8@80-89) ')' (9@90-99)
 463 sending: '(' (10@100-109)
 464 sending: 'x' (11@110-119)
 465 thing (11@110-119): 'x' (11@110-119)
 466 sending: ')' (12@120-129)
 467 line (10@100-129): '(' (10@100-109) thing (11@110-119) ')' (12@120-129)
 468 sending: 'y' (13@130-139)
 469 input (0@129-129): /* Nothing */
 470 input (2@100-129): line (10@100-129) input (0@129-129)
 471 input (2@70-129): line (7@70-99) input (2@100-129)
 472 input (2@0-129): line (-1@0-69) input (2@70-129)
 473 130-139: syntax error, unexpected 'y', expecting END
 474 Freeing nterm input (2@0-129)
 475 Freeing token 'y' (13@130-139)
 476 Parsing FAILED.
 477 ]])
 478
 479
 480 # Syntax error caught by the parser where lookahead = END
 481 # --------------------------------------------------------
 482 # Load the stack and provoke an error that cannot be caught by the
 483 # grammar, to check that the stack is cleared.  And make sure the
 484 # lookahead is freed.
 485 #
 486 #     '(', 'x', ')',
 487 #     '(', 'x', ')',
 488 #     'x'
 489 AT_PARSER_CHECK([./input '(x)(x)x'], 1,
 490 [[sending: '(' (0@0-9)
 491 sending: 'x' (1@10-19)
 492 thing (1@10-19): 'x' (1@10-19)
 493 sending: ')' (2@20-29)
 494 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 495 sending: '(' (3@30-39)
 496 sending: 'x' (4@40-49)
 497 thing (4@40-49): 'x' (4@40-49)
 498 sending: ')' (5@50-59)
 499 line (3@30-59): '(' (3@30-39) thing (4@40-49) ')' (5@50-59)
 500 sending: 'x' (6@60-69)
 501 thing (6@60-69): 'x' (6@60-69)
 502 sending: END (7@70-79)
 503 70-79: syntax error, unexpected END, expecting 'x'
 504 Freeing nterm thing (6@60-69)
 505 Freeing nterm line (3@30-59)
 506 Freeing nterm line (0@0-29)
 507 Freeing token END (7@70-79)
 508 Parsing FAILED.
 509 ]])
 510
 511
 512 # Check destruction upon stack overflow
 513 # -------------------------------------
 514 # Upon stack overflow, all symbols on the stack should be destroyed.
 515 # Only check for yacc.c.
 516 AT_YACC_IF([
 517 AT_PARSER_CHECK([./input '(x)(x)(x)(x)(x)(x)(x)'], 2,
 518 [[sending: '(' (0@0-9)
 519 sending: 'x' (1@10-19)
 520 thing (1@10-19): 'x' (1@10-19)
 521 sending: ')' (2@20-29)
 522 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 523 sending: '(' (3@30-39)
 524 sending: 'x' (4@40-49)
 525 thing (4@40-49): 'x' (4@40-49)
 526 sending: ')' (5@50-59)
 527 line (3@30-59): '(' (3@30-39) thing (4@40-49) ')' (5@50-59)
 528 sending: '(' (6@60-69)
 529 sending: 'x' (7@70-79)
 530 thing (7@70-79): 'x' (7@70-79)
 531 sending: ')' (8@80-89)
 532 line (6@60-89): '(' (6@60-69) thing (7@70-79) ')' (8@80-89)
 533 sending: '(' (9@90-99)
 534 sending: 'x' (10@100-109)
 535 thing (10@100-109): 'x' (10@100-109)
 536 sending: ')' (11@110-119)
 537 line (9@90-119): '(' (9@90-99) thing (10@100-109) ')' (11@110-119)
 538 sending: '(' (12@120-129)
 539 sending: 'x' (13@130-139)
 540 thing (13@130-139): 'x' (13@130-139)
 541 sending: ')' (14@140-149)
 542 line (12@120-149): '(' (12@120-129) thing (13@130-139) ')' (14@140-149)
 543 sending: '(' (15@150-159)
 544 sending: 'x' (16@160-169)
 545 thing (16@160-169): 'x' (16@160-169)
 546 sending: ')' (17@170-179)
 547 line (15@150-179): '(' (15@150-159) thing (16@160-169) ')' (17@170-179)
 548 sending: '(' (18@180-189)
 549 sending: 'x' (19@190-199)
 550 thing (19@190-199): 'x' (19@190-199)
 551 sending: ')' (20@200-209)
 552 200-209: memory exhausted
 553 Freeing nterm thing (19@190-199)
 554 Freeing nterm line (15@150-179)
 555 Freeing nterm line (12@120-149)
 556 Freeing nterm line (9@90-119)
 557 Freeing nterm line (6@60-89)
 558 Freeing nterm line (3@30-59)
 559 Freeing nterm line (0@0-29)
 560 Parsing FAILED (status 2).
 561 ]])
 562 ])
 563
 564 AT_BISON_OPTION_POPDEFS
 565 ])# _AT_CHECK_PRINTER_AND_DESTRUCTOR
 566
 567
 568 # AT_CHECK_PRINTER_AND_DESTRUCTOR([BISON-OPTIONS], [UNION-FLAG], [SKIP_FLAG])
 569 # ---------------------------------------------------------------------------
 570 m4_define([AT_CHECK_PRINTER_AND_DESTRUCTOR],
 571 [AT_SETUP([Printers and Destructors $2: $1])
 572
 573 $3
 574 _AT_CHECK_PRINTER_AND_DESTRUCTOR($[1], $[2], $[3], $[4],
 575 [%error-verbose
 576 %debug
 577 %verbose
 578 %locations
 579 $1], [$2])
 580
 581 AT_CLEANUP
 582 ])
 583
 584
 585 AT_CHECK_PRINTER_AND_DESTRUCTOR([])
 586 AT_CHECK_PRINTER_AND_DESTRUCTOR([], [with union])
 587
 588 AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"])
 589 AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"], [with union])
 590
 591 AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser])
 592 AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser], [with union])
 593
 594
 595
 596 ## ----------------------------------------- ##
 597 ## Default tagless %printer and %destructor. ##
 598 ## ----------------------------------------- ##
 599
 600 # Check that the right %printer and %destructor are called, that they're not
 601 # called for $end, and that $$ and @$ work correctly.
 602
 603 AT_SETUP([Default tagless %printer and %destructor])
 604 AT_BISON_OPTION_PUSHDEFS([%locations])
 605 AT_DATA_GRAMMAR([[input.y]],
 606 [[%error-verbose
 607 %debug
 608 %locations
 609 %initial-action {
 610   @$.first_line = @$.last_line = 1;
 611   @$.first_column = @$.last_column = 1;
 612 }
 613
 614 %{
 615 # include <stdio.h>
 616 # include <stdlib.h>
 617 ]AT_YYLEX_DECLARE[
 618 ]AT_YYERROR_DECLARE[
 619 # define USE(SYM)
 620 %}
 621
 622 %printer {
 623   fprintf (yyoutput, "<*> printer should not be called.\n");
 624 } <*>
 625
 626 %printer {
 627   fprintf (yyoutput, "<> printer for '%c' @ %d", $$, @$.first_column);
 628 } <>
 629 %destructor {
 630   fprintf (stdout, "<> destructor for '%c' @ %d.\n", $$, @$.first_column);
 631 } <>
 632
 633 %printer {
 634   fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);
 635 } 'b' 'c'
 636 %destructor {
 637   fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
 638 } 'b' 'c'
 639
 640 %destructor {
 641   fprintf (yyoutput, "<*> destructor should not be called.\n");
 642 } <*>
 643
 644 %%
 645
 646 start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
 647
 648 %%
 649 ]AT_YYERROR_DEFINE[
 650 ]AT_YYLEX_DEFINE([abcd], [[yylval = res]])[
 651
 652 int
 653 main (void)
 654 {
 655   yydebug = 1;
 656   return yyparse ();
 657 }
 658 ]])
 659
 660 AT_BISON_CHECK([-o input.c input.y])
 661 AT_COMPILE([input])
 662 AT_PARSER_CHECK([./input], 1,
 663 [[<> destructor for 'd' @ 4.
 664 'b'/'c' destructor for 'c' @ 3.
 665 'b'/'c' destructor for 'b' @ 2.
 666 <> destructor for 'a' @ 1.
 667 ]],
 668 [[Starting parse
 669 Entering state 0
 670 Reading a token: Next token is token 'a' (1.1-1.1: <> printer for 'a' @ 1)
 671 Shifting token 'a' (1.1-1.1: <> printer for 'a' @ 1)
 672 Entering state 1
 673 Reading a token: Next token is token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 674 Shifting token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 675 Entering state 3
 676 Reading a token: Next token is token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 677 Shifting token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 678 Entering state 5
 679 Reading a token: Next token is token 'd' (1.4-1.4: <> printer for 'd' @ 4)
 680 Shifting token 'd' (1.4-1.4: <> printer for 'd' @ 4)
 681 Entering state 6
 682 Reading a token: Now at end of input.
 683 syntax error, unexpected $end, expecting 'e'
 684 Error: popping token 'd' (1.4-1.4: <> printer for 'd' @ 4)
 685 Stack now 0 1 3 5
 686 Error: popping token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 687 Stack now 0 1 3
 688 Error: popping token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 689 Stack now 0 1
 690 Error: popping token 'a' (1.1-1.1: <> printer for 'a' @ 1)
 691 Stack now 0
 692 Cleanup: discarding lookahead token $end (1.5-1.5: )
 693 Stack now 0
 694 ]])
 695
 696 AT_BISON_OPTION_POPDEFS
 697 AT_CLEANUP
 698
 699
 700
 701 ## ------------------------------------------------------ ##
 702 ## Default tagged and per-type %printer and %destructor.  ##
 703 ## ------------------------------------------------------ ##
 704
 705 AT_SETUP([Default tagged and per-type %printer and %destructor])
 706 AT_BISON_OPTION_PUSHDEFS
 707 AT_DATA_GRAMMAR([[input.y]],
 708 [[%error-verbose
 709 %debug
 710
 711 %{
 712 # include <stdio.h>
 713 # include <stdlib.h>
 714 ]AT_YYERROR_DECLARE[
 715 ]AT_YYLEX_DECLARE[
 716 # define USE(SYM)
 717 %}
 718
 719 %printer {
 720   fprintf (yyoutput, "<> printer should not be called.\n");
 721 } <>
 722
 723 %union { int field0; int field1; int field2; }
 724 %type <field0> start 'a' 'g'
 725 %type <field1> 'e'
 726 %type <field2> 'f'
 727 %printer {
 728   fprintf (yyoutput, "<*>/<field2>/e printer");
 729 } <*> 'e' <field2>
 730 %destructor {
 731   fprintf (stdout, "<*>/<field2>/e destructor.\n");
 732 } <*> 'e' <field2>
 733
 734 %type <field1> 'b'
 735 %printer { fprintf (yyoutput, "<field1> printer"); } <field1>
 736 %destructor { fprintf (stdout, "<field1> destructor.\n"); } <field1>
 737
 738 %type <field0> 'c'
 739 %printer { fprintf (yyoutput, "'c' printer"); } 'c'
 740 %destructor { fprintf (stdout, "'c' destructor.\n"); } 'c'
 741
 742 %type <field1> 'd'
 743 %printer { fprintf (yyoutput, "'d' printer"); } 'd'
 744 %destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
 745
 746 %destructor {
 747   fprintf (yyoutput, "<> destructor should not be called.\n");
 748 } <>
 749
 750 %%
 751
 752 start:
 753   'a' 'b' 'c' 'd' 'e' 'f' 'g'
 754     {
 755       USE(($1, $2, $3, $4, $5, $6, $7));
 756       $$ = 'S';
 757     }
 758   ;
 759
 760 %%
 761 ]AT_YYERROR_DEFINE[
 762 ]AT_YYLEX_DEFINE([abcdef])[
 763
 764 int
 765 main (void)
 766 {
 767   yydebug = 1;
 768   return yyparse ();
 769 }
 770 ]])
 771
 772 AT_BISON_CHECK([-o input.c input.y])
 773 AT_COMPILE([input])
 774 AT_PARSER_CHECK([./input], 1,
 775 [[<*>/<field2>/e destructor.
 776 <*>/<field2>/e destructor.
 777 'd' destructor.
 778 'c' destructor.
 779 <field1> destructor.
 780 <*>/<field2>/e destructor.
 781 ]],
 782 [[Starting parse
 783 Entering state 0
 784 Reading a token: Next token is token 'a' (<*>/<field2>/e printer)
 785 Shifting token 'a' (<*>/<field2>/e printer)
 786 Entering state 1
 787 Reading a token: Next token is token 'b' (<field1> printer)
 788 Shifting token 'b' (<field1> printer)
 789 Entering state 3
 790 Reading a token: Next token is token 'c' ('c' printer)
 791 Shifting token 'c' ('c' printer)
 792 Entering state 5
 793 Reading a token: Next token is token 'd' ('d' printer)
 794 Shifting token 'd' ('d' printer)
 795 Entering state 6
 796 Reading a token: Next token is token 'e' (<*>/<field2>/e printer)
 797 Shifting token 'e' (<*>/<field2>/e printer)
 798 Entering state 7
 799 Reading a token: Next token is token 'f' (<*>/<field2>/e printer)
 800 Shifting token 'f' (<*>/<field2>/e printer)
 801 Entering state 8
 802 Reading a token: Now at end of input.
 803 syntax error, unexpected $end, expecting 'g'
 804 Error: popping token 'f' (<*>/<field2>/e printer)
 805 Stack now 0 1 3 5 6 7
 806 Error: popping token 'e' (<*>/<field2>/e printer)
 807 Stack now 0 1 3 5 6
 808 Error: popping token 'd' ('d' printer)
 809 Stack now 0 1 3 5
 810 Error: popping token 'c' ('c' printer)
 811 Stack now 0 1 3
 812 Error: popping token 'b' (<field1> printer)
 813 Stack now 0 1
 814 Error: popping token 'a' (<*>/<field2>/e printer)
 815 Stack now 0
 816 Cleanup: discarding lookahead token $end ()
 817 Stack now 0
 818 ]])
 819
 820 AT_BISON_OPTION_POPDEFS
 821 AT_CLEANUP
 822
 823
 824
 825 ## ------------------------------------------------------------- ##
 826 ## Default %printer and %destructor for user-defined end token.  ##
 827 ## ------------------------------------------------------------- ##
 828
 829 AT_SETUP([Default %printer and %destructor for user-defined end token])
 830
 831 # _AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(TYPED)
 832 # -------------------------------------------------------------
 833 m4_define([_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN],
 834 [m4_if($1, 0,
 835   [m4_pushdef([kind], []) m4_pushdef([not_kind], [*])],
 836   [m4_pushdef([kind], [*]) m4_pushdef([not_kind], [])])
 837
 838 AT_BISON_OPTION_PUSHDEFS([%locations])
 839 AT_DATA_GRAMMAR([[input]]$1[[.y]],
 840 [[%error-verbose
 841 %debug
 842 %locations
 843 %initial-action {
 844   @$.first_line = @$.last_line = 1;
 845   @$.first_column = @$.last_column = 1;
 846 }
 847
 848 %{
 849 # include <stdio.h>
 850 # include <stdlib.h>
 851 ]AT_YYERROR_DECLARE[
 852 ]AT_YYLEX_DECLARE[
 853 # define USE(SYM)
 854 %}
 855
 856 %destructor {
 857   fprintf (yyoutput, "<]]not_kind[[> destructor should not be called.\n");
 858 } <]]not_kind[[>
 859
 860 %token END 0
 861 %printer {
 862   fprintf (yyoutput, "<]]kind[[> for '%c' @ %d", $$, @$.first_column);
 863 } <]]kind[[>
 864 %destructor {
 865   fprintf (stdout, "<]]kind[[> for '%c' @ %d.\n", $$, @$.first_column);
 866 } <]]kind[[>
 867
 868 %printer {
 869   fprintf (yyoutput, "<]]not_kind[[> printer should not be called.\n");
 870 } <]]not_kind[[>
 871
 872 ]]m4_if($1, 0, [[[
 873 ]]],
 874 [[[%union { char tag; }
 875 %type <tag> start END]]])[[
 876
 877 %%
 878
 879 start: { $$ = 'S'; } ;
 880
 881 %%
 882
 883 static int
 884 yylex (void)
 885 {
 886   static int called;
 887   if (called++)
 888     abort ();
 889   yylval]]m4_if($1, 0,, [[[.tag]]])[[ = 'E';
 890   yylloc.first_line = yylloc.last_line = 1;
 891   yylloc.first_column = yylloc.last_column = 1;
 892   return 0;
 893 }
 894 ]AT_YYERROR_DEFINE[
 895
 896 int
 897 main (void)
 898 {
 899   yydebug = 1;
 900   return yyparse ();
 901 }
 902 ]])
 903 AT_BISON_OPTION_POPDEFS
 904
 905 AT_BISON_CHECK([-o input$1.c input$1.y])
 906 AT_COMPILE([input$1])
 907 AT_PARSER_CHECK([./input$1], 0,
 908 [[<]]kind[[> for 'E' @ 1.
 909 <]]kind[[> for 'S' @ 1.
 910 ]],
 911 [[Starting parse
 912 Entering state 0
 913 Reducing stack by rule 1 (line 46):
 914 -> $$ = nterm start (1.1-1.1: <]]kind[[> for 'S' @ 1)
 915 Stack now 0
 916 Entering state 1
 917 Reading a token: Now at end of input.
 918 Shifting token END (1.1-1.1: <]]kind[[> for 'E' @ 1)
 919 Entering state 2
 920 Stack now 0 1 2
 921 Cleanup: popping token END (1.1-1.1: <]]kind[[> for 'E' @ 1)
 922 Cleanup: popping nterm start (1.1-1.1: <]]kind[[> for 'S' @ 1)
 923 ]])
 924
 925 m4_popdef([kind])
 926 m4_popdef([not_kind])
 927 ])
 928
 929 _AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(0)
 930 _AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(1)
 931
 932 AT_CLEANUP
 933
 934
 935
 936 ## ------------------------------------------------------------------ ##
 937 ## Default %printer and %destructor are not for error or $undefined.  ##
 938 ## ------------------------------------------------------------------ ##
 939
 940 AT_SETUP([Default %printer and %destructor are not for error or $undefined])
 941
 942 # If Bison were to apply the default %printer and %destructor to the error
 943 # token or to $undefined:
 944 #   - For the error token:
 945 #     - It would generate warnings for unused $n.
 946 #     - It would invoke the %printer and %destructor on the error token's
 947 #       semantic value, which would be initialized from the lookahead, which
 948 #       would be destroyed separately.
 949 #   - For $undefined, who knows what the semantic value would be.
 950 AT_BISON_OPTION_PUSHDEFS
 951 AT_DATA_GRAMMAR([[input.y]],
 952 [[%debug
 953
 954 %{
 955 # include <stdio.h>
 956 # include <stdlib.h>
 957 ]AT_YYERROR_DECLARE[
 958 ]AT_YYLEX_DECLARE[
 959 # define USE(SYM)
 960 %}
 961
 962 %printer {
 963   fprintf (yyoutput, "'%c'", $$);
 964 } <> <*>
 965 %destructor {
 966   fprintf (stderr, "DESTROY '%c'\n", $$);
 967 } <> <*>
 968
 969 %%
 970
 971 start:
 972   { $$ = 'S'; }
 973   /* In order to reveal the problems that this bug caused during parsing, add
 974    * $2 to USE.  */
 975   | 'a' error 'b' 'c' { USE(($1, $3, $4)); $$ = 'S'; }
 976   ;
 977
 978 %%
 979 ]AT_YYERROR_DEFINE[
 980 ]AT_YYLEX_DEFINE([abd], [yylval = res])[
 981 int
 982 main (void)
 983 {
 984   yydebug = 1;
 985   return yyparse ();
 986 }
 987 ]])
 988 AT_BISON_OPTION_POPDEFS
 989
 990 AT_BISON_CHECK([-o input.c input.y])
 991 AT_COMPILE([input])
 992 AT_PARSER_CHECK([./input], [1], [],
 993 [[Starting parse
 994 Entering state 0
 995 Reading a token: Next token is token 'a' ('a')
 996 Shifting token 'a' ('a')
 997 Entering state 1
 998 Reading a token: Next token is token 'b' ('b')
 999 syntax error
1000 Shifting token error ()
1001 Entering state 3
1002 Next token is token 'b' ('b')
1003 Shifting token 'b' ('b')
1004 Entering state 5
1005 Reading a token: Next token is token $undefined ()
1006 Error: popping token 'b' ('b')
1007 DESTROY 'b'
1008 Stack now 0 1 3
1009 Error: popping token error ()
1010 Stack now 0 1
1011 Shifting token error ()
1012 Entering state 3
1013 Next token is token $undefined ()
1014 Error: discarding token $undefined ()
1015 Error: popping token error ()
1016 Stack now 0 1
1017 Shifting token error ()
1018 Entering state 3
1019 Reading a token: Now at end of input.
1020 Cleanup: discarding lookahead token $end ()
1021 Stack now 0 1 3
1022 Cleanup: popping token error ()
1023 Cleanup: popping token 'a' ('a')
1024 DESTROY 'a'
1025 ]])
1026
1027 AT_CLEANUP
1028
1029
1030
1031 ## ------------------------------------------------------ ##
1032 ## Default %printer and %destructor are not for $accept.  ##
1033 ## ------------------------------------------------------ ##
1034
1035 AT_SETUP([Default %printer and %destructor are not for $accept])
1036
1037 # If YYSTYPE is a union and Bison were to apply the default %printer and
1038 # %destructor to $accept:
1039 #   - The %printer and %destructor code generated for $accept would always be
1040 #     dead code because $accept is currently never shifted onto the stack.
1041 #   - $$ for $accept would always be of type YYSTYPE because it's not possible
1042 #     to declare `%type <field> $accept'.  (Also true for $undefined.)
1043 #   - Thus, the compiler might complain that the user code assumes the wrong
1044 #     type for $$ since the code might assume the type associated with a
1045 #     specific union field, which is especially reasonable in C++ since that
1046 #     type may be a base type.  This test case checks for this problem.  (Also
1047 #     true for $undefined and the error token, so there are three warnings for
1048 #     %printer and three for %destructor.)
1049
1050 AT_BISON_OPTION_PUSHDEFS
1051 AT_DATA_GRAMMAR([[input.y]],
1052 [[%debug /* So that %printer is actually compiled.  */
1053
1054 %{
1055 # include <stdio.h>
1056 # include <stdlib.h>
1057 ]AT_YYERROR_DECLARE[
1058 ]AT_YYLEX_DECLARE[
1059 # define USE(SYM)
1060 %}
1061
1062 %printer {
1063   char chr = $$;
1064   fprintf (yyoutput, "'%c'", chr);
1065 } <> <*>
1066 %destructor {
1067   char chr = $$;
1068   fprintf (stderr, "DESTROY '%c'\n", chr);
1069 } <> <*>
1070
1071 %union { char chr; }
1072 %type <chr> start
1073
1074 %%
1075
1076 start: { USE($$); } ;
1077
1078 %%
1079 ]AT_YYERROR_DEFINE[
1080 ]AT_YYLEX_DEFINE([])[
1081 int
1082 main (void)
1083 {
1084   return yyparse ();
1085 }
1086 ]])
1087 AT_BISON_OPTION_POPDEFS
1088
1089 AT_BISON_CHECK([-o input.c input.y])
1090 AT_COMPILE([input])
1091
1092 AT_CLEANUP
1093
1094
1095
1096 ## ------------------------------------------------------ ##
1097 ## Default %printer and %destructor for mid-rule values.  ##
1098 ## ------------------------------------------------------ ##
1099
1100 AT_SETUP([Default %printer and %destructor for mid-rule values])
1101
1102 AT_BISON_OPTION_PUSHDEFS
1103 AT_DATA_GRAMMAR([[input.y]],
1104 [[%debug /* So that %printer is actually compiled.  */
1105
1106 %{
1107 # include <stdio.h>
1108 # include <stdlib.h>
1109 ]AT_YYERROR_DECLARE[
1110 ]AT_YYLEX_DECLARE[
1111 # define USE(SYM)
1112 # define YYLTYPE int
1113 # define YYLLOC_DEFAULT(Current, Rhs, N) (void)(Rhs)
1114 # define YY_LOCATION_PRINT(File, Loc)
1115 %}
1116
1117 %printer { fprintf (yyoutput, "%d", @$); } <>
1118 %destructor { fprintf (stderr, "DESTROY %d\n", @$); } <>
1119 %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1120 %destructor { fprintf (yyoutput, "<*> destructor should not be called"); } <*>
1121
1122 %%
1123
1124 start:
1125   {           @$ = 1; } // Not set or used.
1126   { USE ($$); @$ = 2; } // Both set and used.
1127   { USE ($$); @$ = 3; } // Only set.
1128   {           @$ = 4; } // Only used.
1129   'c'
1130   { USE (($$, $2, $4, $5)); @$ = 0; }
1131   ;
1132
1133 %%
1134 ]AT_YYERROR_DEFINE[
1135 ]AT_YYLEX_DEFINE([])[
1136 int
1137 main (void)
1138 {
1139   yydebug = 1;
1140   return yyparse ();
1141 }
1142 ]])
1143 AT_BISON_OPTION_POPDEFS
1144
1145 AT_BISON_CHECK([-o input.c input.y], 0,,
1146 [[input.y:33.3-23: warning: unset value: $$
1147 input.y:30.3-35.37: warning: unused value: $3
1148 ]])
1149
1150 AT_COMPILE([input])
1151 AT_PARSER_CHECK([./input], 1,,
1152 [[Starting parse
1153 Entering state 0
1154 Reducing stack by rule 1 (line 30):
1155 -> $$ = nterm $@1 (: )
1156 Stack now 0
1157 Entering state 2
1158 Reducing stack by rule 2 (line 31):
1159 -> $$ = nterm @2 (: 2)
1160 Stack now 0 2
1161 Entering state 4
1162 Reducing stack by rule 3 (line 32):
1163 -> $$ = nterm @3 (: 3)
1164 Stack now 0 2 4
1165 Entering state 5
1166 Reducing stack by rule 4 (line 33):
1167 -> $$ = nterm @4 (: 4)
1168 Stack now 0 2 4 5
1169 Entering state 6
1170 Reading a token: Now at end of input.
1171 syntax error
1172 Error: popping nterm @4 (: 4)
1173 DESTROY 4
1174 Stack now 0 2 4 5
1175 Error: popping nterm @3 (: 3)
1176 DESTROY 3
1177 Stack now 0 2 4
1178 Error: popping nterm @2 (: 2)
1179 DESTROY 2
1180 Stack now 0 2
1181 Error: popping nterm $@1 (: )
1182 Stack now 0
1183 Cleanup: discarding lookahead token $end (: )
1184 Stack now 0
1185 ]])
1186
1187 AT_CLEANUP
1188
1189
1190 ## ----------------------- ##
1191 ## @$ implies %locations.  ##
1192 ## ----------------------- ##
1193
1194 # Bison once forgot to check for @$ in actions other than semantic actions.
1195
1196 # AT_CHECK_ACTION_LOCATIONS(ACTION-DIRECTIVE)
1197 # -------------------------------------------
1198 m4_define([AT_CHECK_ACTION_LOCATIONS],
1199 [AT_SETUP([[@$ in ]$1[ implies %locations]])
1200 AT_BISON_OPTION_PUSHDEFS
1201 AT_DATA_GRAMMAR([[input.y]],
1202 [[%code {
1203   #include <stdio.h>
1204 ]AT_YYERROR_DECLARE[
1205 ]AT_YYLEX_DECLARE[
1206 }
1207
1208 %debug
1209
1210 ]$1[ {
1211   printf ("%d\n", @$.first_line);
1212 } ]m4_if($1, [%initial-action], [], [[start]])[
1213
1214 %%
1215
1216 start:  ;
1217
1218 %%
1219
1220 static int
1221 yylex (void)
1222 {
1223   return 0;
1224 }
1225
1226 ]AT_YYERROR_DEFINE[
1227 int
1228 main (void)
1229 {
1230   return yyparse ();
1231 }
1232 ]])
1233
1234 AT_BISON_CHECK([[-o input.c input.y]])
1235 AT_COMPILE([[input]])
1236 AT_BISON_OPTION_POPDEFS
1237 AT_CLEANUP])
1238
1239 AT_CHECK_ACTION_LOCATIONS([[%initial-action]])
1240 AT_CHECK_ACTION_LOCATIONS([[%destructor]])
1241 AT_CHECK_ACTION_LOCATIONS([[%printer]])
1242
1243
1244 ## ----------------------------------------------- ##
1245 ## Fix user actions without a trailing semicolon.  ##
1246 ## ----------------------------------------------- ##
1247
1248 AT_SETUP([[Fix user actions without a trailing semicolon]])
1249
1250 # This feature is undocumented, but we accidentally broke it in 2.3a,
1251 # and there was a complaint at:
1252 # <http://lists.gnu.org/archive/html/bug-bison/2008-11/msg00001.html>.
1253 AT_BISON_OPTION_PUSHDEFS
1254 AT_DATA([input.y],
1255 [[%%
1256 start: test2 test1 test0 testc;
1257
1258 test2
1259 : 'a' { semi;                   /* TEST:N:2 */ }
1260 | 'b' { if (0) {no_semi}        /* TEST:N:2 */ }
1261 | 'c' { if (0) {semi;}          /* TEST:N:2 */ }
1262 | 'd' { semi;   no_semi         /* TEST:Y:2 */ }
1263 | 'e' { semi(); no_semi()       /* TEST:Y:2 */ }
1264 | 'f' { semi[]; no_semi[]       /* TEST:Y:2 */ }
1265 | 'g' { semi++; no_semi++       /* TEST:Y:2 */ }
1266 | 'h' { {no_semi} no_semi       /* TEST:Y:2 */ }
1267 | 'i' { {semi;}   no_semi       /* TEST:Y:2 */ }
1268 ;
1269 test1
1270   : 'a' { semi;                 // TEST:N:1 ;
1271 } | 'b' { if (0) {no_semi}      // TEST:N:1 ;
1272 } | 'c' { if (0) {semi;}        // TEST:N:1 ;
1273 } | 'd' { semi;   no_semi       // TEST:Y:1 ;
1274 } | 'e' { semi(); no_semi()     // TEST:Y:1 ;
1275 } | 'f' { semi[]; no_semi[]     // TEST:Y:1 ;
1276 } | 'g' { semi++; no_semi++     // TEST:Y:1 ;
1277 } | 'h' { {no_semi} no_semi     // TEST:Y:1 ;
1278 } | 'i' { {semi;}   no_semi     // TEST:Y:1 ;
1279 } ;
1280 test0
1281   : 'a' { semi;                 // TEST:N:1 {}
1282 } | 'b' { if (0) {no_semi}      // TEST:N:1 {}
1283 } | 'c' { if (0) {semi;}        // TEST:N:1 {}
1284 } | 'd' { semi;   no_semi       // TEST:Y:1 {}
1285 } | 'e' { semi(); no_semi()     // TEST:Y:1 {}
1286 } | 'f' { semi[]; no_semi[]     // TEST:Y:1 {}
1287 } | 'g' { semi++; no_semi++     // TEST:Y:1 {}
1288 } | 'h' { {no_semi} no_semi     // TEST:Y:1 {}
1289 } | 'i' { {semi;}   no_semi     // TEST:Y:1 {}
1290 } ;
1291
1292 testc
1293 : 'a' {
1294 #define TEST_MACRO_N \
1295 []"broken\" $ @ $$ @$ [];\
1296 string;"}
1297 | 'b' {
1298 no_semi
1299 #define TEST_MACRO_N \
1300 []"broken\" $ @ $$ @$ [];\
1301 string;"}
1302 ]])
1303 AT_BISON_OPTION_POPDEFS
1304
1305 AT_BISON_CHECK([[-o input.c input.y]], [0], [],
1306 [[input.y:8.48: warning: a ';' might be needed at the end of action code
1307 input.y:8.48: warning: future versions of Bison will not add the ';'
1308 input.y:9.48: warning: a ';' might be needed at the end of action code
1309 input.y:9.48: warning: future versions of Bison will not add the ';'
1310 input.y:10.48: warning: a ';' might be needed at the end of action code
1311 input.y:10.48: warning: future versions of Bison will not add the ';'
1312 input.y:11.48: warning: a ';' might be needed at the end of action code
1313 input.y:11.48: warning: future versions of Bison will not add the ';'
1314 input.y:12.48: warning: a ';' might be needed at the end of action code
1315 input.y:12.48: warning: future versions of Bison will not add the ';'
1316 input.y:13.48: warning: a ';' might be needed at the end of action code
1317 input.y:13.48: warning: future versions of Bison will not add the ';'
1318 input.y:20.1: warning: a ';' might be needed at the end of action code
1319 input.y:20.1: warning: future versions of Bison will not add the ';'
1320 input.y:21.1: warning: a ';' might be needed at the end of action code
1321 input.y:21.1: warning: future versions of Bison will not add the ';'
1322 input.y:22.1: warning: a ';' might be needed at the end of action code
1323 input.y:22.1: warning: future versions of Bison will not add the ';'
1324 input.y:23.1: warning: a ';' might be needed at the end of action code
1325 input.y:23.1: warning: future versions of Bison will not add the ';'
1326 input.y:24.1: warning: a ';' might be needed at the end of action code
1327 input.y:24.1: warning: future versions of Bison will not add the ';'
1328 input.y:25.1: warning: a ';' might be needed at the end of action code
1329 input.y:25.1: warning: future versions of Bison will not add the ';'
1330 input.y:31.1: warning: a ';' might be needed at the end of action code
1331 input.y:31.1: warning: future versions of Bison will not add the ';'
1332 input.y:32.1: warning: a ';' might be needed at the end of action code
1333 input.y:32.1: warning: future versions of Bison will not add the ';'
1334 input.y:33.1: warning: a ';' might be needed at the end of action code
1335 input.y:33.1: warning: future versions of Bison will not add the ';'
1336 input.y:34.1: warning: a ';' might be needed at the end of action code
1337 input.y:34.1: warning: future versions of Bison will not add the ';'
1338 input.y:35.1: warning: a ';' might be needed at the end of action code
1339 input.y:35.1: warning: future versions of Bison will not add the ';'
1340 input.y:36.1: warning: a ';' might be needed at the end of action code
1341 input.y:36.1: warning: future versions of Bison will not add the ';'
1342 ]])
1343
1344 AT_MATCHES_CHECK([input.c], [[/\* TEST:N:2 \*/ \}$]],       [[3]])
1345 AT_MATCHES_CHECK([input.c], [[/\* TEST:Y:2 \*/ ;\}$]],      [[6]])
1346 AT_MATCHES_CHECK([input.c], [[// TEST:N:1 [;{}]*\n\}$]],    [[6]])
1347 AT_MATCHES_CHECK([input.c], [[// TEST:Y:1 [;{}]*\n;\}$]],  [[12]])
1348 AT_MATCHES_CHECK([input.c], [[#define TEST_MACRO_N \\\n\[\]"broken\\" \$ \@ \$\$ \@\$ \[\];\\\nstring;"\}]], [[2]])
1349
1350 AT_CLEANUP
1351
1352
1353 ## -------------------------------------------------- ##
1354 ## Destroying lookahead assigned by semantic action.  ##
1355 ## -------------------------------------------------- ##
1356
1357 AT_SETUP([[Destroying lookahead assigned by semantic action]])
1358
1359 AT_BISON_OPTION_PUSHDEFS
1360 AT_DATA_GRAMMAR([input.y],
1361 [[
1362 %code {
1363   #include <assert.h>
1364   #include <stdio.h>
1365 ]AT_YYERROR_DECLARE[
1366 ]AT_YYLEX_DECLARE[
1367   #define USE(Var)
1368 }
1369
1370 %destructor { fprintf (stderr, "'a' destructor\n"); } 'a'
1371 %destructor { fprintf (stderr, "'b' destructor\n"); } 'b'
1372
1373 %%
1374
1375 // In a previous version of Bison, yychar assigned by the semantic
1376 // action below was not translated into yytoken before the lookahead was
1377 // discarded and thus before its destructor (selected according to
1378 // yytoken) was called in order to return from yyparse.  This would
1379 // happen even if YYACCEPT was performed in a later semantic action as
1380 // long as only consistent states with default reductions were visited
1381 // in between.  However, we leave YYACCEPT in the same semantic action
1382 // for this test in order to show that skeletons cannot simply translate
1383 // immediately after every semantic action because a semantic action
1384 // that has set yychar might not always return normally.  Instead,
1385 // skeletons must translate before every use of yytoken.
1386 start: 'a' accept { USE($1); } ;
1387 accept: /*empty*/ {
1388   assert (yychar == YYEMPTY);
1389   yychar = 'b';
1390   YYACCEPT;
1391 } ;
1392
1393 %%
1394 ]AT_YYERROR_DEFINE[
1395 ]AT_YYLEX_DEFINE([a])[
1396 int
1397 main (void)
1398 {
1399   return yyparse ();
1400 }
1401 ]])
1402 AT_BISON_OPTION_POPDEFS
1403 AT_BISON_CHECK([[-o input.c input.y]])
1404 AT_COMPILE([[input]])
1405 AT_PARSER_CHECK([[./input]], [[0]], [],
1406 [['b' destructor
1407 'a' destructor
1408 ]])
1409
1410 AT_CLEANUP
1411
1412 ## ---------- ##
1413 ## YYBACKUP.  ##
1414 ## ---------- ##
1415
1416 AT_SETUP([[YYBACKUP]])
1417
1418 AT_BISON_OPTION_PUSHDEFS([%pure-parser])
1419
1420 AT_DATA_GRAMMAR([input.y],
1421 [[
1422 %error-verbose
1423 %debug
1424 %pure-parser
1425 %code {
1426 # include <stdio.h>
1427 # include <stdlib.h>
1428 # include <assert.h>
1429
1430   ]AT_YYERROR_DECLARE[
1431   static int yylex (YYSTYPE *yylval);
1432 }
1433 %%
1434 input:
1435   exp exp {}
1436 ;
1437
1438 exp:
1439   'a'     { printf ("a: %d\n", $1); }
1440 | 'b'     { YYBACKUP('a', 123); }
1441 | 'c' 'd' { YYBACKUP('a', 456); }
1442 ;
1443
1444 %%
1445 ]AT_YYERROR_DEFINE[
1446 static int
1447 yylex (YYSTYPE *yylval)
1448 {
1449   static char const input[] = "bcd";
1450   static size_t toknum;
1451   assert (toknum < sizeof input);
1452   *yylval = (toknum + 1) * 10;
1453   return input[toknum++];
1454 }
1455
1456 int
1457 main (void)
1458 {
1459   yydebug = !!getenv("YYDEBUG");
1460   return yyparse ();
1461 }
1462 ]])
1463 AT_BISON_OPTION_POPDEFS
1464
1465 AT_BISON_CHECK([[-o input.c input.y]])
1466 AT_COMPILE([[input]])
1467 AT_PARSER_CHECK([[./input]], [[0]],
1468 [[a: 123
1469 a: 456
1470 ]])
1471
1472 AT_CLEANUP