tests/actions.at

   1 e# Executing Actions.                               -*- Autotest -*-
   2
   3 # Copyright (C) 2001-2015 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 [[%define parse.error verbose
  34 %debug
  35 %code {
  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 ]AT_MAIN_DEFINE[
  56 ]])
  57 AT_BISON_OPTION_POPDEFS
  58
  59 AT_BISON_CHECK([-d -v -o input.c input.y])
  60 AT_COMPILE([input])
  61 AT_PARSER_CHECK([./input], 0,
  62 [[0123456789
  63 ]])
  64
  65 AT_CLEANUP
  66
  67 ## ----------------------- ##
  68 ## Implicitly empty rule.  ##
  69 ## ----------------------- ##
  70
  71 AT_SETUP([Implicitly empty rule])
  72
  73 AT_DATA_GRAMMAR([[1.y]],
  74 [[%%
  75 exp: a b;
  76 a: /* empty. */ {};
  77 // A mid-rule action does not count as an empty rule.
  78 b: {} {};
  79 ]])
  80
  81 AT_BISON_CHECK([-fcaret -Wempty-rule 1.y], [0], [],
  82 [[1.y:11.17-18: warning: empty rule without %empty [-Wempty-rule]
  83  a: /* empty. */ {};
  84                  ^^
  85 ]])
  86
  87 AT_DATA_GRAMMAR([[2.y]],
  88 [[%%
  89 exp: a b c;
  90 a: /* empty. */ {};
  91 b: %empty       {};
  92 c: /* empty. */ {};
  93 ]])
  94
  95 AT_BISON_CHECK([-fcaret 2.y], [0], [],
  96 [[2.y:11.17-18: warning: empty rule without %empty [-Wempty-rule]
  97  a: /* empty. */ {};
  98                  ^^
  99 2.y:13.17-18: warning: empty rule without %empty [-Wempty-rule]
 100  c: /* empty. */ {};
 101                  ^^
 102 ]])
 103
 104 AT_BISON_CHECK([-fcaret -Wno-empty-rule 2.y], [0])
 105
 106 AT_CLEANUP
 107
 108 ## ------------------------ ##
 109 ## Invalid uses of %empty.  ##
 110 ## ------------------------ ##
 111
 112 AT_SETUP([Invalid uses of %empty])
 113
 114 AT_DATA_GRAMMAR([[one.y]],
 115 [[%%
 116 exp:
 117   %empty {} %empty
 118 ;
 119 ]])
 120
 121 AT_BISON_CHECK([-fcaret one.y], [1], [],
 122 [[one.y:11.13-18: error: only one %empty allowed per rule
 123    %empty {} %empty
 124              ^^^^^^
 125 one.y:11.3-8: previous declaration
 126    %empty {} %empty
 127    ^^^^^^
 128 ]])
 129
 130 AT_DATA_GRAMMAR([[two.y]],
 131 [[%%
 132 exp:
 133   'a' %empty    {}
 134 | %empty 'a'    {}
 135 | %empty {}     {}
 136 ;
 137 ]])
 138
 139 AT_BISON_CHECK([-fcaret two.y], [1], [],
 140 [[two.y:11.7-12: error: %empty on non-empty rule
 141    'a' %empty    {}
 142        ^^^^^^
 143 two.y:12.3-8: error: %empty on non-empty rule
 144  | %empty 'a'    {}
 145    ^^^^^^
 146 two.y:13.3-8: error: %empty on non-empty rule
 147  | %empty {}     {}
 148    ^^^^^^
 149 ]])
 150
 151 AT_CLEANUP
 152
 153 ## ---------------------- ##
 154 ## Valid uses of %empty.  ##
 155 ## ---------------------- ##
 156
 157 AT_SETUP([Valid uses of %empty])
 158
 159 AT_BISON_OPTION_PUSHDEFS
 160 AT_DATA_GRAMMAR([[input.y]],
 161 [[
 162 %debug
 163 %code
 164 {
 165 ]AT_YYERROR_DECLARE[
 166 ]AT_YYLEX_DECLARE[
 167 }
 168 %%
 169 exp: %empty {}
 170 %%
 171 ]AT_YYERROR_DEFINE[
 172 ]AT_YYLEX_DEFINE[
 173 ]AT_MAIN_DEFINE[
 174 ]])
 175
 176 AT_FULL_COMPILE([input])
 177 AT_PARSER_CHECK([./input])
 178 AT_BISON_OPTION_POPDEFS
 179 AT_CLEANUP
 180
 181 ## ------------------ ##
 182 ## Initial location.  ##
 183 ## ------------------ ##
 184
 185 # AT_TEST(SKELETON-NAME, DIRECTIVES, [MORE-DIRECTIVES], [LOCATION = 1.1])
 186 # -----------------------------------------------------------------------
 187 # Check that the initial location is correct.
 188 m4_pushdef([AT_TEST],
 189 [AT_SETUP([Initial location: $1 $2])
 190
 191 AT_BISON_OPTION_PUSHDEFS([%locations %skeleton "$1" $2])
 192 AT_DATA_GRAMMAR([[input.y]],
 193 [[%locations
 194 %debug
 195 %skeleton "$1"
 196 ]$2[
 197 ]$3[
 198 %code
 199 {
 200 # include <stdio.h>
 201 # include <stdlib.h> /* getenv */
 202 ]AT_YYERROR_DECLARE[
 203 ]AT_YYLEX_DECLARE[
 204 }
 205 %%
 206 exp: { ]AT_SKEL_CC_IF([[std::cerr << @$ << std::endl]],
 207                       [[LOCATION_PRINT(stderr, @$); fputc ('\n', stderr)]])[; }
 208 %%
 209 ]AT_YYERROR_DEFINE[
 210
 211 ]AT_YYLEX_PROTOTYPE[
 212 {]AT_PURE_IF([
 213   YYUSE(lvalp);
 214   YYUSE(llocp);], [AT_SKEL_CC_IF([
 215   YYUSE(lvalp);
 216   YYUSE(llocp);])])[
 217   return 'x';
 218 }
 219
 220 int
 221 main (void)
 222 {]AT_SKEL_CC_IF([[
 223   yy::parser p;
 224   p.set_debug_level (!!getenv("YYDEBUG"));
 225   return p.parse ();]], [[
 226   yydebug = !!getenv("YYDEBUG");
 227   return !!yyparse (]AT_PARAM_IF([0])[);]])[
 228 }
 229 ]])
 230
 231 AT_FULL_COMPILE([input])
 232 AT_PARSER_CHECK([./input], 1, [],
 233 [m4_default([$4], [1.1])
 234 m4_default([$4], [1.1])[: syntax error
 235 ]])
 236 AT_BISON_OPTION_POPDEFS
 237 AT_CLEANUP
 238 ])
 239
 240 ## FIXME: test Java, and iterate over skeletons.
 241 AT_TEST([yacc.c])
 242 AT_TEST([yacc.c], [%define api.pure full])
 243 AT_TEST([yacc.c], [%define api.pure %parse-param { int x }])
 244 AT_TEST([yacc.c], [%define api.push-pull both])
 245 AT_TEST([yacc.c], [%define api.push-pull both %define api.pure full])
 246 AT_TEST([glr.c])
 247 AT_TEST([glr.c], [%define api.pure])
 248 AT_TEST([lalr1.cc])
 249 AT_TEST([glr.cc])
 250
 251 ## A very different test, based on PostgreSQL's implementation of the
 252 ## locations.  See
 253 ## http://lists.gnu.org/archive/html/bug-bison/2012-11/msg00023.html
 254 ##
 255 ## Weirdly enough, to trigger the warning with GCC 4.7, we must not
 256 ## use fprintf, so run the test twice: once to check the warning
 257 ## (absence thereof), and another time to check the value.
 258 AT_TEST([yacc.c], [%define api.pure full],
 259 [[%{
 260 # define YYLTYPE int
 261 # define LOCATION_PRINT(Stream, Loc)      \
 262    (void) (Loc)
 263 # define YYLLOC_DEFAULT(Current, Rhs, N)    \
 264   (Current) = ((Rhs)[N ? 1 : 0])
 265 %}
 266 ]],
 267 [@&t@])
 268
 269 AT_TEST([yacc.c], [%define api.pure full],
 270 [[%{
 271 # define YYLTYPE int
 272 # define LOCATION_PRINT(Stream, Loc)      \
 273     fprintf ((Stream), "%d", (Loc))
 274 # define YYLLOC_DEFAULT(Current, Rhs, N)    \
 275   (Current) = ((Rhs)[N ? 1 : 0])
 276 %}
 277 ]],
 278 [0])
 279
 280
 281 m4_popdef([AT_TEST])
 282
 283
 284
 285 ## ---------------- ##
 286 ## Location Print.  ##
 287 ## ---------------- ##
 288
 289 # AT_TEST(SKELETON-NAME, DIRECTIVES, [MORE-DIRECTIVES])
 290 # -----------------------------------------------------
 291 # Check that the initial location is correct.
 292 m4_pushdef([AT_TEST],
 293 [AT_SETUP([Location print: $1 $2])
 294
 295 AT_BISON_OPTION_PUSHDEFS([%locations %skeleton "$1" $2])
 296 AT_DATA_GRAMMAR([[input.y]],
 297 [[%locations
 298 %debug
 299 %skeleton "$1"
 300 ]$2[
 301 ]$3[
 302 %code
 303 {
 304 ]AT_YYERROR_DECLARE[
 305 ]AT_YYLEX_DECLARE[
 306 }
 307 %%
 308 exp: %empty;
 309 %%
 310 ]AT_YYERROR_DEFINE[
 311 ]AT_YYLEX_DEFINE[
 312
 313 int
 314 main (void)
 315 {
 316   ]AT_YYLTYPE[ loc;
 317 ]AT_GLR_CC_IF([loc.initialize();])[
 318 #define TEST(L1, C1, L2, C2)          \
 319   loc.]AT_FIRST_LINE[ = L1;           \
 320   loc.]AT_FIRST_COLUMN[ = C1;         \
 321   loc.]AT_LAST_LINE[ = L2;            \
 322   loc.]AT_LAST_COLUMN[ = C2;          \
 323   ]AT_SKEL_CC_IF([std::cout << loc],
 324                  [LOCATION_PRINT(stdout, loc)])[;\
 325   putchar ('\n');
 326
 327   TEST(1, 1, 1, 1);
 328   TEST(2, 1, 2, 10);
 329   TEST(3, 1, 4, 1);
 330   TEST(5, 1, 6, 10);
 331
 332   TEST(7, 2, 0, 2);
 333   TEST(8, 0, 8, 0);
 334   return 0;
 335 }
 336 ]])
 337
 338 AT_FULL_COMPILE([input])
 339 AT_PARSER_CHECK([./input], 0,
 340 [[1.1
 341 2.1-9
 342 3.1-4.0
 343 5.1-6.9
 344 7.2
 345 8.0
 346 ]])
 347 AT_BISON_OPTION_POPDEFS
 348 AT_CLEANUP
 349 ])
 350
 351 ## FIXME: test Java, and iterate over skeletons.
 352 AT_TEST([yacc.c])
 353 AT_TEST([glr.c])
 354 AT_TEST([lalr1.cc])
 355 AT_TEST([glr.cc])
 356
 357 m4_popdef([AT_TEST])
 358
 359
 360
 361 ## ---------------- ##
 362 ## Exotic Dollars.  ##
 363 ## ---------------- ##
 364
 365 AT_SETUP([Exotic Dollars])
 366
 367 AT_BISON_OPTION_PUSHDEFS
 368 AT_DATA_GRAMMAR([[input.y]],
 369 [[%define parse.error verbose
 370 %debug
 371 %code {
 372 ]AT_YYERROR_DECLARE[
 373 ]AT_YYLEX_DECLARE[
 374 # define USE(Var)
 375 }
 376
 377 %union
 378 {
 379   int val;
 380 };
 381
 382 %type <val> a_1 a_2 a_5
 383             sum_of_the_five_previous_values
 384
 385 %%
 386 exp: a_1 a_2 { $<val>$ = 3; } { $<val>$ = $<val>3 + 1; } a_5
 387      sum_of_the_five_previous_values
 388     {
 389        USE (($1, $2, $<foo>3, $<foo>4, $5));
 390        printf ("%d\n", $6);
 391     }
 392 ;
 393 a_1: { $$ = 1; };
 394 a_2: { $$ = 2; };
 395 a_5: { $$ = 5; };
 396
 397 sum_of_the_five_previous_values:
 398     {
 399        $$ = $<val>0 + $<val>-1 + $<val>-2 + $<val>-3 + $<val>-4;
 400     }
 401 ;
 402
 403 %%
 404 ]AT_YYERROR_DEFINE[
 405 ]AT_YYLEX_DEFINE[
 406 ]AT_MAIN_DEFINE[
 407 ]])
 408
 409 AT_BISON_CHECK([-d -v -o input.c input.y], 0)
 410 AT_COMPILE([input])
 411 AT_PARSER_CHECK([./input], 0,
 412 [[15
 413 ]])
 414
 415 # Make sure that fields after $n or $-n are parsed correctly.  At one
 416 # point while implementing dashes in symbol names, we were dropping
 417 # fields after $-n.
 418 AT_DATA_GRAMMAR([[input.y]],
 419 [[
 420 %{
 421 ]AT_YYERROR_DECLARE[
 422 ]AT_YYLEX_DECLARE[
 423   typedef struct { int val; } stype;
 424 # define YYSTYPE stype
 425 %}
 426
 427 %%
 428 start: one two { $$.val = $1.val + $2.val; } sum ;
 429 one: { $$.val = 1; } ;
 430 two: { $$.val = 2; } ;
 431 sum: { printf ("%d\n", $0.val + $-1.val + $-2.val); } ;
 432
 433 %%
 434 ]AT_YYERROR_DEFINE[
 435 ]AT_YYLEX_DEFINE[
 436 ]AT_MAIN_DEFINE[
 437 ]])
 438
 439 AT_FULL_COMPILE([input])
 440 AT_PARSER_CHECK([[./input]], [[0]],
 441 [[6
 442 ]])
 443
 444 AT_BISON_OPTION_POPDEFS
 445 AT_CLEANUP
 446
 447
 448
 449 ## -------------------------- ##
 450 ## Printers and Destructors.  ##
 451 ## -------------------------- ##
 452
 453 # _AT_CHECK_PRINTER_AND_DESTRUCTOR($1, $2, $3, $4,
 454 #                                  BISON-DIRECTIVE, UNION-FLAG)
 455 # -------------------------------------------------------------
 456 m4_define([_AT_CHECK_PRINTER_AND_DESTRUCTOR],
 457 [# Make sure complex $n work.
 458 m4_if([$1$2$3$4], $[1]$[2]$[3]$[4], [],
 459        [m4_fatal([$0: Invalid arguments: $@])])dnl
 460
 461 # Be sure to pass all the %directives to this macro to have correct
 462 # helping macros.  So don't put any directly in the Bison file.
 463 AT_BISON_OPTION_PUSHDEFS([$5])
 464 AT_DATA_GRAMMAR([[input.y]],
 465 [[%code requires {
 466 #include <stdio.h>
 467 #include <stdlib.h>
 468 #include <string.h>
 469 #include <assert.h>
 470
 471 #define YYINITDEPTH 10
 472 #define YYMAXDEPTH 10
 473 #define RANGE(Location) ]AT_LALR1_CC_IF([(Location).begin.line, (Location).end.line],
 474       [(Location).first_line, (Location).last_line])[
 475
 476 /* Display the symbol type Symbol.  */
 477 #define V(Symbol, Value, Location, Sep) \
 478    fprintf (stderr, #Symbol " (%d@%d-%d)" Sep, Value, RANGE(Location))
 479 }
 480
 481 $5
 482 ]m4_ifval([$6], [%union
 483 {
 484   int ival;
 485 }])
 486 AT_LALR1_CC_IF([%define global_tokens_and_yystype])
 487 m4_ifval([$6], [[%code provides {]], [[%code {]])
 488 AT_LALR1_CC_IF([typedef yy::location YYLTYPE;])[
 489 ]AT_YYLEX_DECLARE[
 490 ]AT_LALR1_CC_IF([], [AT_YYERROR_DECLARE])
 491 [}
 492
 493 ]m4_ifval([$6], [%type <ival> '(' 'x' 'y' ')' ';' thing line input END])[
 494
 495 /* FIXME: This %printer isn't actually tested.  */
 496 %printer
 497   {
 498     ]AT_LALR1_CC_IF([debug_stream () << $$;],
 499                     [fprintf (yyoutput, "%d", $$)])[;
 500   }
 501   input line thing 'x' 'y'
 502
 503 %destructor
 504   { fprintf (stderr, "Freeing nterm input (%d@%d-%d)\n", $$, RANGE (@$)); }
 505   input
 506
 507 %destructor
 508   { fprintf (stderr, "Freeing nterm line (%d@%d-%d)\n", $$, RANGE (@$)); }
 509   line
 510
 511 %destructor
 512   { fprintf (stderr, "Freeing nterm thing (%d@%d-%d)\n", $$, RANGE (@$)); }
 513   thing
 514
 515 %destructor
 516   { fprintf (stderr, "Freeing token 'x' (%d@%d-%d)\n", $$, RANGE (@$)); }
 517   'x'
 518
 519 %destructor
 520   { fprintf (stderr, "Freeing token 'y' (%d@%d-%d)\n", $$, RANGE (@$)); }
 521   'y'
 522
 523 %token END 0
 524 %destructor
 525   { fprintf (stderr, "Freeing token END (%d@%d-%d)\n", $$, RANGE (@$)); }
 526   END
 527
 528 %%
 529 /*
 530    This grammar is made to exercise error recovery.
 531    "Lines" starting with '(' support error recovery, with
 532    ')' as synchronizing token.  Lines starting with 'x' can never
 533    be recovered from if in error.
 534 */
 535
 536 input:
 537   /* Nothing. */
 538     {
 539       $$ = 0;
 540       V(input, $$, @$, ": /* Nothing */\n");
 541     }
 542 | line input /* Right recursive to load the stack so that popping at
 543                 END can be exercised.  */
 544     {
 545       $$ = 2;
 546       V(input, $$, @$, ": ");
 547       V(line,  $1, @1, " ");
 548       V(input, $2, @2, "\n");
 549     }
 550 ;
 551
 552 line:
 553   thing thing thing ';'
 554     {
 555       $$ = $1;
 556       V(line,  $$, @$, ": ");
 557       V(thing, $1, @1, " ");
 558       V(thing, $2, @2, " ");
 559       V(thing, $3, @3, " ");
 560       V(;,     $4, @4, "\n");
 561     }
 562 | '(' thing thing ')'
 563     {
 564       $$ = $1;
 565       V(line,  $$, @$, ": ");
 566       V('(',   $1, @1, " ");
 567       V(thing, $2, @2, " ");
 568       V(thing, $3, @3, " ");
 569       V(')',   $4, @4, "\n");
 570     }
 571 | '(' thing ')'
 572     {
 573       $$ = $1;
 574       V(line,  $$, @$, ": ");
 575       V('(',   $1, @1, " ");
 576       V(thing, $2, @2, " ");
 577       V(')',   $3, @3, "\n");
 578     }
 579 | '(' error ')'
 580     {
 581       $$ = -1;
 582       V(line,  $$, @$, ": ");
 583       V('(',   $1, @1, " ");
 584       fprintf (stderr, "error (@%d-%d) ", RANGE(@2));
 585       V(')',   $3, @3, "\n");
 586     }
 587 ;
 588
 589 thing:
 590   'x'
 591     {
 592       $$ = $1;
 593       V(thing, $$, @$, ": ");
 594       V('x',   $1, @1, "\n");
 595     }
 596 ;
 597 %%
 598 /* Alias to ARGV[1]. */
 599 const char *source = YY_NULLPTR;
 600
 601 ]AT_YYERROR_DEFINE[
 602
 603 static
 604 ]AT_YYLEX_PROTOTYPE[
 605 {
 606   static unsigned int counter = 0;
 607
 608   unsigned int c = ]AT_VAL[]m4_ifval([$6], [.ival])[ = counter++;
 609   /* As in BASIC, line numbers go from 10 to 10.  */
 610   ]AT_LOC_FIRST_LINE[ = ]AT_LOC_FIRST_COLUMN[ = 10 * c;
 611   ]AT_LOC_LAST_LINE[ = ]AT_LOC_LAST_COLUMN[ = ]AT_LOC_FIRST_LINE[ + 9;
 612   assert (c <= strlen (source));
 613   if (source[c])
 614     fprintf (stderr, "sending: '%c'", source[c]);
 615   else
 616     fprintf (stderr, "sending: END");
 617   fprintf (stderr, " (%d@%d-%d)\n", c, RANGE (]AT_LOC[));
 618   return source[c];
 619 }
 620 ]AT_LALR1_CC_IF(
 621 [static bool yydebug;
 622 int
 623 yyparse ()
 624 {
 625   yy::parser parser;
 626   parser.set_debug_level (yydebug);
 627   return parser.parse ();
 628 }
 629 ])[
 630
 631 int
 632 main (int argc, const char *argv[])
 633 {
 634   int status;
 635   yydebug = !!getenv ("YYDEBUG");
 636   assert (argc == 2);
 637   source = argv[1];
 638   status = yyparse ();
 639   switch (status)
 640     {
 641       case 0: fprintf (stderr, "Successful parse.\n"); break;
 642       case 1: fprintf (stderr, "Parsing FAILED.\n"); break;
 643       default: fprintf (stderr, "Parsing FAILED (status %d).\n", status); break;
 644     }
 645   return status;
 646 }
 647 ]])
 648
 649 AT_FULL_COMPILE([input])
 650
 651
 652 # Check the location of "empty"
 653 # -----------------------------
 654 # I.e., epsilon-reductions, as in "(x)" which ends by reducing
 655 # an empty "line" nterm.
 656 # FIXME: This location is not satisfying.  Depend on the lookahead?
 657 AT_PARSER_CHECK([./input '(x)'], 0, [],
 658 [[sending: '(' (0@0-9)
 659 sending: 'x' (1@10-19)
 660 thing (1@10-19): 'x' (1@10-19)
 661 sending: ')' (2@20-29)
 662 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 663 sending: END (3@30-39)
 664 input (0@29-29): /* Nothing */
 665 input (2@0-29): line (0@0-29) input (0@29-29)
 666 Freeing token END (3@30-39)
 667 Freeing nterm input (2@0-29)
 668 Successful parse.
 669 ]])
 670
 671
 672 # Check locations in error recovery
 673 # ---------------------------------
 674 # '(y)' is an error, but can be recovered from.  But what's the location
 675 # of the error itself ('y'), and of the resulting reduction ('(error)').
 676 AT_PARSER_CHECK([./input '(y)'], 0, [],
 677 [[sending: '(' (0@0-9)
 678 sending: 'y' (1@10-19)
 679 10.10-19.18: syntax error, unexpected 'y', expecting 'x'
 680 Freeing token 'y' (1@10-19)
 681 sending: ')' (2@20-29)
 682 line (-1@0-29): '(' (0@0-9) error (@10-19) ')' (2@20-29)
 683 sending: END (3@30-39)
 684 input (0@29-29): /* Nothing */
 685 input (2@0-29): line (-1@0-29) input (0@29-29)
 686 Freeing token END (3@30-39)
 687 Freeing nterm input (2@0-29)
 688 Successful parse.
 689 ]])
 690
 691
 692 # Syntax errors caught by the parser
 693 # ----------------------------------
 694 # Exercise the discarding of stack top and input until 'error'
 695 # can be reduced.
 696 #
 697 #     '(', 'x', 'x', 'x', 'x', 'x', ')',
 698 #
 699 # Load the stack and provoke an error that cannot be caught by the
 700 # grammar, to check that the stack is cleared.  And make sure the
 701 # lookahead is freed.
 702 #
 703 #     '(', 'x', ')',
 704 #     '(', 'x', ')',
 705 #     'y'
 706 AT_PARSER_CHECK([./input '(xxxxx)(x)(x)y'], 1, [],
 707 [[sending: '(' (0@0-9)
 708 sending: 'x' (1@10-19)
 709 thing (1@10-19): 'x' (1@10-19)
 710 sending: 'x' (2@20-29)
 711 thing (2@20-29): 'x' (2@20-29)
 712 sending: 'x' (3@30-39)
 713 30.30-39.38: syntax error, unexpected 'x', expecting ')'
 714 Freeing nterm thing (2@20-29)
 715 Freeing nterm thing (1@10-19)
 716 Freeing token 'x' (3@30-39)
 717 sending: 'x' (4@40-49)
 718 Freeing token 'x' (4@40-49)
 719 sending: 'x' (5@50-59)
 720 Freeing token 'x' (5@50-59)
 721 sending: ')' (6@60-69)
 722 line (-1@0-69): '(' (0@0-9) error (@10-59) ')' (6@60-69)
 723 sending: '(' (7@70-79)
 724 sending: 'x' (8@80-89)
 725 thing (8@80-89): 'x' (8@80-89)
 726 sending: ')' (9@90-99)
 727 line (7@70-99): '(' (7@70-79) thing (8@80-89) ')' (9@90-99)
 728 sending: '(' (10@100-109)
 729 sending: 'x' (11@110-119)
 730 thing (11@110-119): 'x' (11@110-119)
 731 sending: ')' (12@120-129)
 732 line (10@100-129): '(' (10@100-109) thing (11@110-119) ')' (12@120-129)
 733 sending: 'y' (13@130-139)
 734 input (0@129-129): /* Nothing */
 735 input (2@100-129): line (10@100-129) input (0@129-129)
 736 input (2@70-129): line (7@70-99) input (2@100-129)
 737 input (2@0-129): line (-1@0-69) input (2@70-129)
 738 130.130-139.138: syntax error, unexpected 'y', expecting END
 739 Freeing nterm input (2@0-129)
 740 Freeing token 'y' (13@130-139)
 741 Parsing FAILED.
 742 ]])
 743
 744
 745 # Syntax error caught by the parser where lookahead = END
 746 # --------------------------------------------------------
 747 # Load the stack and provoke an error that cannot be caught by the
 748 # grammar, to check that the stack is cleared.  And make sure the
 749 # lookahead is freed.
 750 #
 751 #     '(', 'x', ')',
 752 #     '(', 'x', ')',
 753 #     'x'
 754 AT_PARSER_CHECK([./input '(x)(x)x'], 1, [],
 755 [[sending: '(' (0@0-9)
 756 sending: 'x' (1@10-19)
 757 thing (1@10-19): 'x' (1@10-19)
 758 sending: ')' (2@20-29)
 759 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 760 sending: '(' (3@30-39)
 761 sending: 'x' (4@40-49)
 762 thing (4@40-49): 'x' (4@40-49)
 763 sending: ')' (5@50-59)
 764 line (3@30-59): '(' (3@30-39) thing (4@40-49) ')' (5@50-59)
 765 sending: 'x' (6@60-69)
 766 thing (6@60-69): 'x' (6@60-69)
 767 sending: END (7@70-79)
 768 70.70-79.78: syntax error, unexpected END, expecting 'x'
 769 Freeing nterm thing (6@60-69)
 770 Freeing nterm line (3@30-59)
 771 Freeing nterm line (0@0-29)
 772 Freeing token END (7@70-79)
 773 Parsing FAILED.
 774 ]])
 775
 776
 777 # Check destruction upon stack overflow
 778 # -------------------------------------
 779 # Upon stack overflow, all symbols on the stack should be destroyed.
 780 # Only check for yacc.c.
 781 AT_YACC_IF([
 782 AT_PARSER_CHECK([./input '(x)(x)(x)(x)(x)(x)(x)'], 2, [],
 783 [[sending: '(' (0@0-9)
 784 sending: 'x' (1@10-19)
 785 thing (1@10-19): 'x' (1@10-19)
 786 sending: ')' (2@20-29)
 787 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 788 sending: '(' (3@30-39)
 789 sending: 'x' (4@40-49)
 790 thing (4@40-49): 'x' (4@40-49)
 791 sending: ')' (5@50-59)
 792 line (3@30-59): '(' (3@30-39) thing (4@40-49) ')' (5@50-59)
 793 sending: '(' (6@60-69)
 794 sending: 'x' (7@70-79)
 795 thing (7@70-79): 'x' (7@70-79)
 796 sending: ')' (8@80-89)
 797 line (6@60-89): '(' (6@60-69) thing (7@70-79) ')' (8@80-89)
 798 sending: '(' (9@90-99)
 799 sending: 'x' (10@100-109)
 800 thing (10@100-109): 'x' (10@100-109)
 801 sending: ')' (11@110-119)
 802 line (9@90-119): '(' (9@90-99) thing (10@100-109) ')' (11@110-119)
 803 sending: '(' (12@120-129)
 804 sending: 'x' (13@130-139)
 805 thing (13@130-139): 'x' (13@130-139)
 806 sending: ')' (14@140-149)
 807 line (12@120-149): '(' (12@120-129) thing (13@130-139) ')' (14@140-149)
 808 sending: '(' (15@150-159)
 809 sending: 'x' (16@160-169)
 810 thing (16@160-169): 'x' (16@160-169)
 811 sending: ')' (17@170-179)
 812 line (15@150-179): '(' (15@150-159) thing (16@160-169) ')' (17@170-179)
 813 sending: '(' (18@180-189)
 814 sending: 'x' (19@190-199)
 815 thing (19@190-199): 'x' (19@190-199)
 816 sending: ')' (20@200-209)
 817 200.200-209.208: memory exhausted
 818 Freeing nterm thing (19@190-199)
 819 Freeing nterm line (15@150-179)
 820 Freeing nterm line (12@120-149)
 821 Freeing nterm line (9@90-119)
 822 Freeing nterm line (6@60-89)
 823 Freeing nterm line (3@30-59)
 824 Freeing nterm line (0@0-29)
 825 Parsing FAILED (status 2).
 826 ]])
 827 ])
 828
 829 AT_BISON_OPTION_POPDEFS
 830 ])# _AT_CHECK_PRINTER_AND_DESTRUCTOR
 831
 832
 833 # AT_CHECK_PRINTER_AND_DESTRUCTOR([BISON-OPTIONS], [UNION-FLAG], [SKIP_FLAG])
 834 # ---------------------------------------------------------------------------
 835 m4_define([AT_CHECK_PRINTER_AND_DESTRUCTOR],
 836 [AT_SETUP([Printers and Destructors$2]m4_ifval([$1], [[: $1]]))
 837
 838 $3
 839 _AT_CHECK_PRINTER_AND_DESTRUCTOR($[1], $[2], $[3], $[4],
 840 [%define parse.error verbose
 841 %debug
 842 %verbose
 843 %locations
 844 $1], [$2])
 845
 846 AT_CLEANUP
 847 ])
 848
 849
 850 AT_CHECK_PRINTER_AND_DESTRUCTOR([])
 851 AT_CHECK_PRINTER_AND_DESTRUCTOR([], [ with union])
 852
 853 AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"])
 854 AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"], [ with union])
 855
 856 AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser])
 857 AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser], [ with union])
 858
 859
 860
 861 ## ----------------------------------------- ##
 862 ## Default tagless %printer and %destructor. ##
 863 ## ----------------------------------------- ##
 864
 865 # Check that the right %printer and %destructor are called, that they're not
 866 # called for $end, and that $$ and @$ work correctly.
 867
 868 AT_SETUP([Default tagless %printer and %destructor])
 869 AT_BISON_OPTION_PUSHDEFS([%locations %debug])
 870 AT_DATA_GRAMMAR([[input.y]],
 871 [[%define parse.error verbose
 872 %debug
 873 %locations
 874
 875 %code {
 876 ]AT_YYLEX_DECLARE[
 877 ]AT_YYERROR_DECLARE[
 878 # define USE(SYM)
 879 }
 880
 881 %printer {
 882   fprintf (yyoutput, "<*> printer should not be called.\n");
 883 } <*>
 884
 885 %printer {
 886   fprintf (yyoutput, "<> printer for '%c' @ %d", $$, @$.first_column);
 887 } <>
 888 %destructor {
 889   fprintf (stdout, "<> destructor for '%c' @ %d.\n", $$, @$.first_column);
 890 } <>
 891
 892 %printer {
 893   fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);
 894 } 'b' 'c'
 895 %destructor {
 896   fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
 897 } 'b' 'c'
 898
 899 %destructor {
 900   fprintf (yyoutput, "<*> destructor should not be called.\n");
 901 } <*>
 902
 903 %%
 904
 905 start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
 906
 907 %%
 908 ]AT_YYERROR_DEFINE[
 909 ]AT_YYLEX_DEFINE(["abcd"], [[yylval = res]])[
 910 ]AT_MAIN_DEFINE[
 911 ]])
 912
 913 AT_BISON_CHECK([-o input.c input.y], [], [],
 914 [[input.y:30.3-5: warning: useless %destructor for type <*> [-Wother]
 915 input.y:30.3-5: warning: useless %printer for type <*> [-Wother]
 916 ]])
 917 AT_COMPILE([input])
 918 AT_PARSER_CHECK([./input --debug], 1,
 919 [[<> destructor for 'd' @ 4.
 920 'b'/'c' destructor for 'c' @ 3.
 921 'b'/'c' destructor for 'b' @ 2.
 922 <> destructor for 'a' @ 1.
 923 ]],
 924 [[Starting parse
 925 Entering state 0
 926 Reading a token: Next token is token 'a' (1.1: <> printer for 'a' @ 1)
 927 Shifting token 'a' (1.1: <> printer for 'a' @ 1)
 928 Entering state 1
 929 Reading a token: Next token is token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 930 Shifting token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 931 Entering state 3
 932 Reading a token: Next token is token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 933 Shifting token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 934 Entering state 5
 935 Reading a token: Next token is token 'd' (1.4: <> printer for 'd' @ 4)
 936 Shifting token 'd' (1.4: <> printer for 'd' @ 4)
 937 Entering state 6
 938 Reading a token: Now at end of input.
 939 1.5: syntax error, unexpected $end, expecting 'e'
 940 Error: popping token 'd' (1.4: <> printer for 'd' @ 4)
 941 Stack now 0 1 3 5
 942 Error: popping token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 943 Stack now 0 1 3
 944 Error: popping token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 945 Stack now 0 1
 946 Error: popping token 'a' (1.1: <> printer for 'a' @ 1)
 947 Stack now 0
 948 Cleanup: discarding lookahead token $end (1.5: )
 949 Stack now 0
 950 ]])
 951
 952 AT_BISON_OPTION_POPDEFS
 953 AT_CLEANUP
 954
 955
 956
 957 ## ------------------------------------------------------ ##
 958 ## Default tagged and per-type %printer and %destructor.  ##
 959 ## ------------------------------------------------------ ##
 960
 961 AT_SETUP([Default tagged and per-type %printer and %destructor])
 962 AT_BISON_OPTION_PUSHDEFS([%debug])
 963 AT_DATA_GRAMMAR([[input.y]],
 964 [[%define parse.error verbose
 965 %debug
 966
 967 %{
 968 ]AT_YYERROR_DECLARE[
 969 ]AT_YYLEX_DECLARE[
 970 # define USE(SYM)
 971 %}
 972
 973 %printer {
 974   fprintf (yyoutput, "<> printer should not be called.\n");
 975 } <>
 976
 977 %union { int field0; int field1; int field2; }
 978 %type <field0> start 'a' 'g'
 979 %type <field1> 'e'
 980 %type <field2> 'f'
 981 %printer {
 982   fprintf (yyoutput, "<*>/<field2>/e printer");
 983 } <*> 'e' <field2>
 984 %destructor {
 985   fprintf (stdout, "<*>/<field2>/e destructor.\n");
 986 } <*> 'e' <field2>
 987
 988 %type <field1> 'b'
 989 %printer { fprintf (yyoutput, "<field1> printer"); } <field1>
 990 %destructor { fprintf (stdout, "<field1> destructor.\n"); } <field1>
 991
 992 %type <field0> 'c'
 993 %printer { fprintf (yyoutput, "'c' printer"); } 'c'
 994 %destructor { fprintf (stdout, "'c' destructor.\n"); } 'c'
 995
 996 %type <field1> 'd'
 997 %printer { fprintf (yyoutput, "'d' printer"); } 'd'
 998 %destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
 999
1000 %destructor {
1001   fprintf (yyoutput, "<> destructor should not be called.\n");
1002 } <>
1003
1004 %%
1005
1006 start:
1007   'a' 'b' 'c' 'd' 'e' 'f' 'g'
1008     {
1009       USE(($1, $2, $3, $4, $5, $6, $7));
1010       $$ = 'S';
1011     }
1012   ;
1013
1014 %%
1015 ]AT_YYERROR_DEFINE[
1016 ]AT_YYLEX_DEFINE(["abcdef"])[
1017 ]AT_MAIN_DEFINE[
1018 ]])
1019
1020 AT_BISON_CHECK([-o input.c input.y], [], [],
1021 [[input.y:22.3-4: warning: useless %destructor for type <> [-Wother]
1022 input.y:22.3-4: warning: useless %printer for type <> [-Wother]
1023 ]])
1024 AT_COMPILE([input])
1025 AT_PARSER_CHECK([./input --debug], 1,
1026 [[<*>/<field2>/e destructor.
1027 <*>/<field2>/e destructor.
1028 'd' destructor.
1029 'c' destructor.
1030 <field1> destructor.
1031 <*>/<field2>/e destructor.
1032 ]],
1033 [[Starting parse
1034 Entering state 0
1035 Reading a token: Next token is token 'a' (<*>/<field2>/e printer)
1036 Shifting token 'a' (<*>/<field2>/e printer)
1037 Entering state 1
1038 Reading a token: Next token is token 'b' (<field1> printer)
1039 Shifting token 'b' (<field1> printer)
1040 Entering state 3
1041 Reading a token: Next token is token 'c' ('c' printer)
1042 Shifting token 'c' ('c' printer)
1043 Entering state 5
1044 Reading a token: Next token is token 'd' ('d' printer)
1045 Shifting token 'd' ('d' printer)
1046 Entering state 6
1047 Reading a token: Next token is token 'e' (<*>/<field2>/e printer)
1048 Shifting token 'e' (<*>/<field2>/e printer)
1049 Entering state 7
1050 Reading a token: Next token is token 'f' (<*>/<field2>/e printer)
1051 Shifting token 'f' (<*>/<field2>/e printer)
1052 Entering state 8
1053 Reading a token: Now at end of input.
1054 syntax error, unexpected $end, expecting 'g'
1055 Error: popping token 'f' (<*>/<field2>/e printer)
1056 Stack now 0 1 3 5 6 7
1057 Error: popping token 'e' (<*>/<field2>/e printer)
1058 Stack now 0 1 3 5 6
1059 Error: popping token 'd' ('d' printer)
1060 Stack now 0 1 3 5
1061 Error: popping token 'c' ('c' printer)
1062 Stack now 0 1 3
1063 Error: popping token 'b' (<field1> printer)
1064 Stack now 0 1
1065 Error: popping token 'a' (<*>/<field2>/e printer)
1066 Stack now 0
1067 Cleanup: discarding lookahead token $end ()
1068 Stack now 0
1069 ]])
1070
1071 AT_BISON_OPTION_POPDEFS
1072 AT_CLEANUP
1073
1074
1075
1076 ## ------------------------------------------------------------- ##
1077 ## Default %printer and %destructor for user-defined end token.  ##
1078 ## ------------------------------------------------------------- ##
1079
1080 AT_SETUP([Default %printer and %destructor for user-defined end token])
1081
1082 # AT_TEST(TYPED)
1083 # --------------
1084 m4_pushdef([AT_TEST],
1085 [m4_if($1, 0,
1086   [m4_pushdef([kind], []) m4_pushdef([not_kind], [*])],
1087   [m4_pushdef([kind], [*]) m4_pushdef([not_kind], [])])
1088
1089 AT_BISON_OPTION_PUSHDEFS([%locations %debug])
1090 AT_DATA_GRAMMAR([[input]]$1[[.y]],
1091 [[%define parse.error verbose
1092 %debug
1093 %locations
1094
1095 %code {
1096 ]AT_YYERROR_DECLARE[
1097 ]AT_YYLEX_DECLARE[
1098 # define USE(SYM)
1099 }
1100
1101 %destructor {
1102   fprintf (yyoutput, "<]]not_kind[[> destructor should not be called.\n");
1103 } <]]not_kind[[>
1104
1105 %token END 0
1106 %printer {
1107   fprintf (yyoutput, "<]]kind[[> for '%c' @ %d", $$, @$.first_column);
1108 } <]]kind[[>
1109 %destructor {
1110   fprintf (stdout, "<]]kind[[> for '%c' @ %d.\n", $$, @$.first_column);
1111 } <]]kind[[>
1112
1113 %printer {
1114   fprintf (yyoutput, "<]]not_kind[[> printer should not be called.\n");
1115 } <]]not_kind[[>
1116
1117 ]]m4_if($1, 0, [[[
1118 ]]],
1119 [[[%union { char tag; }
1120 %type <tag> start END]]])[[
1121
1122 %%
1123
1124 start: { $$ = 'S'; } ;
1125
1126 %%
1127 #include <stdlib.h> /* abort */
1128 static int
1129 yylex (void)
1130 {
1131   static int called;
1132   if (called++)
1133     abort ();
1134   yylval]]m4_if($1, 0,, [[[.tag]]])[[ = 'E';
1135   yylloc.first_line = yylloc.last_line = 1;
1136   yylloc.first_column = yylloc.last_column = 1;
1137   return 0;
1138 }
1139 ]AT_YYERROR_DEFINE[
1140 ]AT_MAIN_DEFINE[
1141 ]])
1142 AT_BISON_OPTION_POPDEFS
1143
1144 AT_BISON_CHECK([-o input$1.c input$1.y], [], [],
1145 [m4_if([$1], [0],
1146 [[input0.y:30.3-5: warning: useless %destructor for type <*> [-Wother]
1147 input0.y:30.3-5: warning: useless %printer for type <*> [-Wother]
1148 ]],
1149 [[input1.y:30.3-4: warning: useless %destructor for type <> [-Wother]
1150 input1.y:30.3-4: warning: useless %printer for type <> [-Wother]
1151 ]])])
1152
1153 AT_COMPILE([input$1])
1154
1155 AT_PARSER_CHECK([./input$1 --debug], 0,
1156 [[<]]kind[[> for 'E' @ 1.
1157 <]]kind[[> for 'S' @ 1.
1158 ]],
1159 [[Starting parse
1160 Entering state 0
1161 Reducing stack by rule 1 (line 49):
1162 -> $$ = nterm start (1.1: <]]kind[[> for 'S' @ 1)
1163 Stack now 0
1164 Entering state 1
1165 Reading a token: Now at end of input.
1166 Shifting token END (1.1: <]]kind[[> for 'E' @ 1)
1167 Entering state 2
1168 Stack now 0 1 2
1169 Cleanup: popping token END (1.1: <]]kind[[> for 'E' @ 1)
1170 Cleanup: popping nterm start (1.1: <]]kind[[> for 'S' @ 1)
1171 ]])
1172
1173 m4_popdef([kind])
1174 m4_popdef([not_kind])
1175 ])
1176
1177 AT_TEST(0)
1178 AT_TEST(1)
1179
1180 m4_popdef([AT_TEST])
1181
1182 AT_CLEANUP
1183
1184
1185
1186 ## ------------------------------------------------------------------ ##
1187 ## Default %printer and %destructor are not for error or $undefined.  ##
1188 ## ------------------------------------------------------------------ ##
1189
1190 AT_SETUP([Default %printer and %destructor are not for error or $undefined])
1191
1192 # If Bison were to apply the default %printer and %destructor to the error
1193 # token or to $undefined:
1194 #   - For the error token:
1195 #     - It would generate warnings for unused $n.
1196 #     - It would invoke the %printer and %destructor on the error token's
1197 #       semantic value, which would be initialized from the lookahead, which
1198 #       would be destroyed separately.
1199 #   - For $undefined, who knows what the semantic value would be.
1200 AT_BISON_OPTION_PUSHDEFS([%debug])
1201 AT_DATA_GRAMMAR([[input.y]],
1202 [[%debug
1203
1204 %{
1205 # include <stdio.h>
1206 # include <stdlib.h>
1207 ]AT_YYERROR_DECLARE[
1208 ]AT_YYLEX_DECLARE[
1209 # define USE(SYM)
1210 %}
1211
1212 %printer {
1213   fprintf (yyoutput, "'%c'", $$);
1214 } <> <*>
1215 %destructor {
1216   fprintf (stderr, "DESTROY '%c'\n", $$);
1217 } <> <*>
1218
1219 %%
1220
1221 start:
1222   { $$ = 'S'; }
1223   /* In order to reveal the problems that this bug caused during parsing, add
1224    * $2 to USE.  */
1225   | 'a' error 'b' 'c' { USE(($1, $3, $4)); $$ = 'S'; }
1226   ;
1227
1228 %%
1229 ]AT_YYERROR_DEFINE[
1230 ]AT_YYLEX_DEFINE(["abd"], [yylval = res])[
1231 ]AT_MAIN_DEFINE[
1232 ]])
1233 AT_BISON_OPTION_POPDEFS
1234
1235 AT_BISON_CHECK([-o input.c input.y], [], [],
1236 [[input.y:23.6-8: warning: useless %destructor for type <*> [-Wother]
1237 input.y:23.6-8: warning: useless %printer for type <*> [-Wother]
1238 ]])
1239 AT_COMPILE([input])
1240 AT_PARSER_CHECK([./input --debug], [1], [],
1241 [[Starting parse
1242 Entering state 0
1243 Reading a token: Next token is token 'a' ('a')
1244 Shifting token 'a' ('a')
1245 Entering state 1
1246 Reading a token: Next token is token 'b' ('b')
1247 syntax error
1248 Shifting token error ()
1249 Entering state 3
1250 Next token is token 'b' ('b')
1251 Shifting token 'b' ('b')
1252 Entering state 5
1253 Reading a token: Next token is token $undefined ()
1254 Error: popping token 'b' ('b')
1255 DESTROY 'b'
1256 Stack now 0 1 3
1257 Error: popping token error ()
1258 Stack now 0 1
1259 Shifting token error ()
1260 Entering state 3
1261 Next token is token $undefined ()
1262 Error: discarding token $undefined ()
1263 Error: popping token error ()
1264 Stack now 0 1
1265 Shifting token error ()
1266 Entering state 3
1267 Reading a token: Now at end of input.
1268 Cleanup: discarding lookahead token $end ()
1269 Stack now 0 1 3
1270 Cleanup: popping token error ()
1271 Cleanup: popping token 'a' ('a')
1272 DESTROY 'a'
1273 ]])
1274
1275 AT_CLEANUP
1276
1277
1278
1279 ## ------------------------------------------------------ ##
1280 ## Default %printer and %destructor are not for $accept.  ##
1281 ## ------------------------------------------------------ ##
1282
1283 AT_SETUP([Default %printer and %destructor are not for $accept])
1284
1285 # If YYSTYPE is a union and Bison were to apply the default %printer and
1286 # %destructor to $accept:
1287 #   - The %printer and %destructor code generated for $accept would always be
1288 #     dead code because $accept is currently never shifted onto the stack.
1289 #   - $$ for $accept would always be of type YYSTYPE because it's not possible
1290 #     to declare '%type <field> $accept'.  (Also true for $undefined.)
1291 #   - Thus, the compiler might complain that the user code assumes the wrong
1292 #     type for $$ since the code might assume the type associated with a
1293 #     specific union field, which is especially reasonable in C++ since that
1294 #     type may be a base type.  This test case checks for this problem.  (Also
1295 #     true for $undefined and the error token, so there are three warnings for
1296 #     %printer and three for %destructor.)
1297
1298 AT_BISON_OPTION_PUSHDEFS([%debug])
1299 AT_DATA_GRAMMAR([[input.y]],
1300 [[%debug /* So that %printer is actually compiled.  */
1301
1302 %{
1303 # include <stdio.h>
1304 # include <stdlib.h>
1305 ]AT_YYERROR_DECLARE[
1306 ]AT_YYLEX_DECLARE[
1307 # define USE(SYM)
1308 %}
1309
1310 %printer {
1311   char chr = $$;
1312   fprintf (yyoutput, "'%c'", chr);
1313 } <> <*>
1314 %destructor {
1315   char chr = $$;
1316   fprintf (stderr, "DESTROY '%c'\n", chr);
1317 } <> <*>
1318
1319 %union { char chr; }
1320 %type <chr> start
1321
1322 %%
1323
1324 start: { USE($$); } ;
1325
1326 %%
1327 ]AT_YYERROR_DEFINE[
1328 ]AT_YYLEX_DEFINE[
1329 ]AT_MAIN_DEFINE[
1330 ]])
1331 AT_BISON_OPTION_POPDEFS
1332
1333 AT_BISON_CHECK([-o input.c input.y], [], [],
1334 [[input.y:24.3-4: warning: useless %destructor for type <> [-Wother]
1335 input.y:24.3-4: warning: useless %printer for type <> [-Wother]
1336 ]])
1337 AT_COMPILE([input])
1338
1339 AT_CLEANUP
1340
1341
1342
1343 ## ------------------------------------------------------ ##
1344 ## Default %printer and %destructor for mid-rule values.  ##
1345 ## ------------------------------------------------------ ##
1346
1347 AT_SETUP([Default %printer and %destructor for mid-rule values])
1348
1349 AT_BISON_OPTION_PUSHDEFS([%debug])
1350 AT_DATA_GRAMMAR([[input.y]],
1351 [[%debug /* So that %printer is actually compiled.  */
1352
1353 %{
1354 ]AT_YYERROR_DECLARE[
1355 ]AT_YYLEX_DECLARE[
1356 # define USE(SYM)
1357 # define YYLTYPE int
1358 # define YYLLOC_DEFAULT(Current, Rhs, N) (void)(Rhs)
1359 # define LOCATION_PRINT(File, Loc)
1360 %}
1361
1362 %printer { fprintf (yyoutput, "%d", @$); } <>
1363 %destructor { fprintf (stderr, "DESTROY %d\n", @$); } <>
1364 %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1365 %destructor { fprintf (yyoutput, "<*> destructor should not be called"); } <*>
1366
1367 %%
1368
1369 start:
1370   {           @$ = 1; } // Not set or used.
1371   { USE ($$); @$ = 2; } // Both set and used.
1372   { USE ($$); @$ = 3; } // Only set.
1373   {           @$ = 4; } // Only used.
1374   'c'
1375   { USE (($$, $2, $4, $5)); @$ = 0; }
1376   ;
1377
1378 %%
1379 ]AT_YYERROR_DEFINE[
1380 ]AT_YYLEX_DEFINE[
1381 ]AT_MAIN_DEFINE[
1382 ]])
1383 AT_BISON_OPTION_POPDEFS
1384
1385 AT_BISON_CHECK([-o input.c input.y], 0,,
1386 [[input.y:24.70-72: warning: useless %destructor for type <*> [-Wother]
1387 input.y:24.70-72: warning: useless %printer for type <*> [-Wother]
1388 input.y:33.3-23: warning: unset value: $$ [-Wother]
1389 input.y:32.3-23: warning: unused value: $3 [-Wother]
1390 ]])
1391
1392 AT_BISON_CHECK([-fcaret -o input.c input.y], 0,,
1393 [[input.y:24.70-72: warning: useless %destructor for type <*> [-Wother]
1394  %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1395                                                                       ^^^
1396 input.y:24.70-72: warning: useless %printer for type <*> [-Wother]
1397  %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1398                                                                       ^^^
1399 input.y:33.3-23: warning: unset value: $$ [-Wother]
1400    {           @$ = 4; } // Only used.
1401    ^^^^^^^^^^^^^^^^^^^^^
1402 input.y:32.3-23: warning: unused value: $3 [-Wother]
1403    { USE ($$); @$ = 3; } // Only set.
1404    ^^^^^^^^^^^^^^^^^^^^^
1405 ]])
1406
1407 AT_COMPILE([input])
1408 AT_PARSER_CHECK([./input --debug], 1,,
1409 [[Starting parse
1410 Entering state 0
1411 Reducing stack by rule 1 (line 30):
1412 -> $$ = nterm $@1 (: )
1413 Stack now 0
1414 Entering state 2
1415 Reducing stack by rule 2 (line 31):
1416 -> $$ = nterm @2 (: 2)
1417 Stack now 0 2
1418 Entering state 4
1419 Reducing stack by rule 3 (line 32):
1420 -> $$ = nterm @3 (: 3)
1421 Stack now 0 2 4
1422 Entering state 5
1423 Reducing stack by rule 4 (line 33):
1424 -> $$ = nterm @4 (: 4)
1425 Stack now 0 2 4 5
1426 Entering state 6
1427 Reading a token: Now at end of input.
1428 syntax error
1429 Error: popping nterm @4 (: 4)
1430 DESTROY 4
1431 Stack now 0 2 4 5
1432 Error: popping nterm @3 (: 3)
1433 DESTROY 3
1434 Stack now 0 2 4
1435 Error: popping nterm @2 (: 2)
1436 DESTROY 2
1437 Stack now 0 2
1438 Error: popping nterm $@1 (: )
1439 Stack now 0
1440 Cleanup: discarding lookahead token $end (: )
1441 Stack now 0
1442 ]])
1443
1444 AT_CLEANUP
1445
1446
1447 ## ----------------------- ##
1448 ## @$ implies %locations.  ##
1449 ## ----------------------- ##
1450
1451 # Bison once forgot to check for @$ in actions other than semantic actions.
1452
1453 # AT_CHECK_ACTION_LOCATIONS(ACTION-DIRECTIVE)
1454 # -------------------------------------------
1455 m4_define([AT_CHECK_ACTION_LOCATIONS],
1456 [AT_SETUP([[@$ in ]$1[ implies %locations]])
1457 AT_BISON_OPTION_PUSHDEFS([%debug])
1458 AT_DATA_GRAMMAR([[input.y]],
1459 [[%code {
1460   #include <stdio.h>
1461 ]AT_YYERROR_DECLARE[
1462 ]AT_YYLEX_DECLARE[
1463 }
1464
1465 %debug
1466
1467 ]$1[ {
1468   fprintf (stderr, "%d\n", @$.first_line);
1469 } ]m4_if($1, [%initial-action], [], [[start]])[
1470
1471 %%
1472
1473 start:  ;
1474
1475 %%
1476
1477 static int
1478 yylex (void)
1479 {
1480   return 0;
1481 }
1482
1483 ]AT_YYERROR_DEFINE[
1484 ]AT_MAIN_DEFINE[
1485 ]])
1486
1487 AT_BISON_CHECK([[-o input.c input.y]])
1488 AT_COMPILE([[input]])
1489 AT_BISON_OPTION_POPDEFS
1490 AT_CLEANUP])
1491
1492 AT_CHECK_ACTION_LOCATIONS([[%initial-action]])
1493 AT_CHECK_ACTION_LOCATIONS([[%destructor]])
1494 AT_CHECK_ACTION_LOCATIONS([[%printer]])
1495
1496
1497 ## ------------------------- ##
1498 ## Qualified $$ in actions.  ##
1499 ## ------------------------- ##
1500
1501 # Check that we can use qualified $$ (v.g., $<type>$) not only in rule
1502 # actions, but also where $$ is valid: %destructor/%printer and
1503 # %initial-action.
1504 #
1505 # FIXME: Not actually checking %destructor, but it's the same code as
1506 # %printer...
1507 #
1508 # To do that, use a semantic value that has two fields (sem_type),
1509 # declare symbols to have only one of these types (INT, float), and
1510 # use $<type>$ to get the other one.  Including for symbols that are
1511 # not typed (UNTYPED).
1512
1513 m4_pushdef([AT_TEST],
1514 [AT_SETUP([[Qualified $$ in actions: $1]])
1515
1516 AT_BISON_OPTION_PUSHDEFS([%skeleton "$1" %debug])
1517
1518 AT_DATA_GRAMMAR([[input.y]],
1519 [[%skeleton "$1"
1520 %debug
1521 %code requires
1522 {
1523   typedef struct sem_type
1524   {
1525     int ival;
1526     float fval;
1527   } sem_type;
1528
1529 # define YYSTYPE sem_type
1530
1531 ]AT_SKEL_CC_IF([[
1532 # include <iostream>
1533   static void
1534   report (std::ostream& yyo, int ival, float fval)
1535   {
1536     yyo << "ival: " << ival << ", fval: " <<  fval;
1537   }
1538 ]], [[
1539 # include <stdio.h>
1540   static void
1541   report (FILE* yyo, int ival, float fval)
1542   {
1543     fprintf (yyo, "ival: %d, fval: %1.1f", ival, fval);
1544   }
1545 ]])[
1546 }
1547
1548 %code
1549 {
1550   ]AT_YYERROR_DECLARE[
1551   ]AT_YYLEX_DECLARE[
1552 }
1553
1554 %token UNTYPED
1555 %token <ival> INT
1556 %type <fval> float
1557 %printer { report (yyo, $$,       $<fval>$); } <ival>;
1558 %printer { report (yyo, $<ival>$, $$      ); } <fval>;
1559 %printer { report (yyo, $<ival>$, $<fval>$); } <>;
1560
1561 %initial-action
1562 {
1563   $<ival>$ = 42;
1564   $<fval>$ = 4.2;
1565 }
1566
1567 %%
1568 float: UNTYPED INT
1569 {
1570   $$       = $<fval>1 + $<fval>2;
1571   $<ival>$ = $<ival>1 + $][2;
1572 };
1573 %%
1574 ]AT_YYERROR_DEFINE[
1575 ]AT_YYLEX_DEFINE(AT_SKEL_CC_IF([[{yy::parser::token::UNTYPED,
1576                                  yy::parser::token::INT,
1577                                   EOF}]],
1578                                [[{UNTYPED, INT, EOF}]]),
1579                  [AT_VAL.ival = toknum * 10; AT_VAL.fval = toknum / 10.0;])[
1580 ]AT_MAIN_DEFINE[
1581 ]])
1582
1583 AT_FULL_COMPILE([[input]])
1584 AT_PARSER_CHECK([./input --debug], 0, [], [stderr])
1585 # Don't be too picky on the traces, GLR is not exactly the same.  Keep
1586 # only the lines from the printer.
1587 AT_CHECK([[sed -ne '/ival:/p' stderr]], 0,
1588 [[Reading a token: Next token is token UNTYPED (ival: 10, fval: 0.1)
1589 Shifting token UNTYPED (ival: 10, fval: 0.1)
1590 Reading a token: Next token is token INT (ival: 20, fval: 0.2)
1591 Shifting token INT (ival: 20, fval: 0.2)
1592    $][1 = token UNTYPED (ival: 10, fval: 0.1)
1593    $][2 = token INT (ival: 20, fval: 0.2)
1594 -> $$ = nterm float (ival: 30, fval: 0.3)
1595 Cleanup: popping nterm float (ival: 30, fval: 0.3)
1596 ]])
1597
1598 AT_BISON_OPTION_POPDEFS
1599
1600 AT_CLEANUP
1601 ])
1602
1603 AT_TEST([yacc.c])
1604 AT_TEST([glr.c])
1605 AT_TEST([lalr1.cc])
1606 AT_TEST([glr.cc])
1607
1608 m4_popdef([AT_TEST])
1609
1610 ## -------------------------------------------------- ##
1611 ## Destroying lookahead assigned by semantic action.  ##
1612 ## -------------------------------------------------- ##
1613
1614 AT_SETUP([[Destroying lookahead assigned by semantic action]])
1615
1616 AT_BISON_OPTION_PUSHDEFS
1617 AT_DATA_GRAMMAR([input.y],
1618 [[
1619 %code {
1620   #include <assert.h>
1621   #include <stdio.h>
1622 ]AT_YYERROR_DECLARE[
1623 ]AT_YYLEX_DECLARE[
1624   #define USE(Var)
1625 }
1626
1627 %destructor { fprintf (stderr, "'a' destructor\n"); } 'a'
1628 %destructor { fprintf (stderr, "'b' destructor\n"); } 'b'
1629
1630 %%
1631
1632 // In a previous version of Bison, yychar assigned by the semantic
1633 // action below was not translated into yytoken before the lookahead was
1634 // discarded and thus before its destructor (selected according to
1635 // yytoken) was called in order to return from yyparse.  This would
1636 // happen even if YYACCEPT was performed in a later semantic action as
1637 // long as only consistent states with default reductions were visited
1638 // in between.  However, we leave YYACCEPT in the same semantic action
1639 // for this test in order to show that skeletons cannot simply translate
1640 // immediately after every semantic action because a semantic action
1641 // that has set yychar might not always return normally.  Instead,
1642 // skeletons must translate before every use of yytoken.
1643 start: 'a' accept { USE($1); } ;
1644 accept: %empty {
1645   assert (yychar == YYEMPTY);
1646   yychar = 'b';
1647   YYACCEPT;
1648 } ;
1649
1650 %%
1651 ]AT_YYERROR_DEFINE[
1652 ]AT_YYLEX_DEFINE(["a"])[
1653 ]AT_MAIN_DEFINE[
1654 ]])
1655 AT_BISON_OPTION_POPDEFS
1656 AT_BISON_CHECK([[-o input.c input.y]])
1657 AT_COMPILE([[input]])
1658 AT_PARSER_CHECK([[./input]], [[0]], [],
1659 [['b' destructor
1660 'a' destructor
1661 ]])
1662
1663 AT_CLEANUP
1664
1665 ## ---------- ##
1666 ## YYBACKUP.  ##
1667 ## ---------- ##
1668
1669 AT_SETUP([[YYBACKUP]])
1670
1671 AT_BISON_OPTION_PUSHDEFS([%pure-parser %debug])
1672
1673 AT_DATA_GRAMMAR([input.y],
1674 [[
1675 %error-verbose
1676 %debug
1677 %pure-parser
1678 %code {
1679 # include <stdio.h>
1680 # include <stdlib.h>
1681 # include <assert.h>
1682
1683   ]AT_YYERROR_DECLARE[
1684   ]AT_YYLEX_DECLARE[
1685 }
1686 %%
1687 input:
1688   exp exp {}
1689 ;
1690
1691 exp:
1692   'a'     { printf ("a: %d\n", $1); }
1693 | 'b'     { YYBACKUP('a', 123); }
1694 | 'c' 'd' { YYBACKUP('a', 456); }
1695 ;
1696
1697 %%
1698 ]AT_YYERROR_DEFINE[
1699 ]AT_YYLEX_DEFINE(["bcd"], [*lvalp = (toknum + 1) * 10])[
1700 ]AT_MAIN_DEFINE[
1701 ]])
1702 AT_BISON_OPTION_POPDEFS
1703
1704 AT_BISON_CHECK([[-o input.c input.y]])
1705 AT_COMPILE([[input]])
1706 AT_PARSER_CHECK([[./input]], [[0]],
1707 [[a: 123
1708 a: 456
1709 ]])
1710
1711 AT_CLEANUP