tests/actions.at

   1 e# Executing Actions.                               -*- Autotest -*-
   2
   3 # Copyright (C) 2001-2013 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 ## ------------------ ##
  69 ## Initial location.  ##
  70 ## ------------------ ##
  71
  72 # AT_TEST(SKELETON-NAME, DIRECTIVES, [MORE-DIRECTIVES], [LOCATION = 1.1])
  73 # -----------------------------------------------------------------------
  74 # Check that the initial location is correct.
  75 m4_pushdef([AT_TEST],
  76 [AT_SETUP([Initial location: $1 $2])
  77
  78 AT_BISON_OPTION_PUSHDEFS([%locations %skeleton "$1" $2])
  79 AT_DATA_GRAMMAR([[input.y]],
  80 [[%defines /* FIXME: Required by lalr1.cc in Bison 2.6. */
  81 %locations
  82 %debug
  83 %skeleton "$1"
  84 ]$2[
  85 ]$3[
  86 %code
  87 {
  88 # include <stdio.h>
  89 # include <stdlib.h> /* getenv */
  90 ]AT_YYERROR_DECLARE[
  91 ]AT_YYLEX_DECLARE[
  92 }
  93 %%
  94 exp: { ]AT_SKEL_CC_IF([[std::cerr << @$ << std::endl]],
  95                       [[LOCATION_PRINT(stderr, @$); fputc ('\n', stderr)]])[; }
  96 %%
  97 ]AT_YYERROR_DEFINE[
  98
  99 ]AT_YYLEX_PROTOTYPE[
 100 {]AT_PURE_IF([
 101   YYUSE(lvalp);
 102   YYUSE(llocp);], [AT_SKEL_CC_IF([
 103   YYUSE(lvalp);
 104   YYUSE(llocp);])])[
 105   return 'x';
 106 }
 107
 108 int
 109 main (void)
 110 {]AT_SKEL_CC_IF([[
 111   yy::parser p;
 112   p.set_debug_level (!!getenv("YYDEBUG"));
 113   return p.parse ();]], [[
 114   yydebug = !!getenv("YYDEBUG");
 115   return !!yyparse (]AT_PARAM_IF([0])[);]])[
 116 }
 117 ]])
 118
 119 AT_FULL_COMPILE([input])
 120 AT_PARSER_CHECK([./input], 1, [],
 121 [m4_default([$4], [1.1])
 122 m4_default([$4], [1.1])[: syntax error
 123 ]])
 124 AT_BISON_OPTION_POPDEFS
 125 AT_CLEANUP
 126 ])
 127
 128 ## FIXME: test Java, and iterate over skeletons.
 129 AT_TEST([yacc.c])
 130 AT_TEST([yacc.c], [%define api.pure full])
 131 AT_TEST([yacc.c], [%define api.pure %parse-param { int x }])
 132 AT_TEST([yacc.c], [%define api.push-pull both])
 133 AT_TEST([yacc.c], [%define api.push-pull both %define api.pure full])
 134 AT_TEST([glr.c])
 135 AT_TEST([glr.c], [%define api.pure])
 136 AT_TEST([lalr1.cc])
 137 AT_TEST([glr.cc])
 138
 139 ## A very different test, based on PostgreSQL's implementation of the
 140 ## locations.  See
 141 ## http://lists.gnu.org/archive/html/bug-bison/2012-11/msg00023.html
 142 ##
 143 ## Weirdly enough, to trigger the warning with GCC 4.7, we must not
 144 ## use fprintf, so run the test twice: once to check the warning
 145 ## (absence thereof), and another time to check the value.
 146 AT_TEST([yacc.c], [%define api.pure full],
 147 [[%{
 148 # define YYLTYPE int
 149 # define LOCATION_PRINT(Stream, Loc)      \
 150    (void) (Loc)
 151 # define YYLLOC_DEFAULT(Current, Rhs, N)    \
 152   (Current) = ((Rhs)[N ? 1 : 0])
 153 %}
 154 ]],
 155 [@&t@])
 156
 157 AT_TEST([yacc.c], [%define api.pure full],
 158 [[%{
 159 # define YYLTYPE int
 160 # define LOCATION_PRINT(Stream, Loc)      \
 161     fprintf ((Stream), "%d", (Loc))
 162 # define YYLLOC_DEFAULT(Current, Rhs, N)    \
 163   (Current) = ((Rhs)[N ? 1 : 0])
 164 %}
 165 ]],
 166 [0])
 167
 168
 169 m4_popdef([AT_TEST])
 170
 171
 172
 173 ## ---------------- ##
 174 ## Location Print.  ##
 175 ## ---------------- ##
 176
 177 # AT_TEST(SKELETON-NAME, DIRECTIVES, [MORE-DIRECTIVES], [LOCATION = 1.1])
 178 # -----------------------------------------------------------------------
 179 # Check that the initial location is correct.
 180 m4_pushdef([AT_TEST],
 181 [AT_SETUP([Location print: $1 $2])
 182
 183 AT_BISON_OPTION_PUSHDEFS([%locations %skeleton "$1" $2])
 184 AT_DATA_GRAMMAR([[input.y]],
 185 [[%defines /* FIXME: Required by lalr1.cc in Bison 2.6. */
 186 %locations
 187 %debug
 188 %skeleton "$1"
 189 ]$2[
 190 ]$3[
 191 %code
 192 {
 193 ]AT_YYERROR_DECLARE[
 194 ]AT_YYLEX_DECLARE[
 195 }
 196 %%
 197 exp: /* empty */;
 198 %%
 199 ]AT_YYERROR_DEFINE[
 200 ]AT_YYLEX_DEFINE[
 201
 202 int
 203 main (void)
 204 {
 205   ]AT_YYLTYPE[ loc;
 206 ]AT_GLR_CC_IF([loc.initialize();])[
 207 #define TEST(L1, C1, L2, C2)          \
 208   loc.]AT_FIRST_LINE[ = L1;           \
 209   loc.]AT_FIRST_COLUMN[ = C1;         \
 210   loc.]AT_LAST_LINE[ = L2;            \
 211   loc.]AT_LAST_COLUMN[ = C2;          \
 212   ]AT_SKEL_CC_IF([std::cout << loc],
 213                  [LOCATION_PRINT(stdout, loc)])[;\
 214   putchar ('\n');
 215
 216   TEST(1, 1, 1, 1);
 217   TEST(2, 1, 2, 10);
 218   TEST(3, 1, 4, 1);
 219   TEST(5, 1, 6, 10);
 220
 221   TEST(7, 2, 0, 2);
 222   TEST(8, 0, 8, 0);
 223   return 0;
 224 }
 225 ]])
 226
 227 AT_FULL_COMPILE([input])
 228 AT_PARSER_CHECK([./input], 0,
 229 [[1.1
 230 2.1-9
 231 3.1-4.0
 232 5.1-6.9
 233 7.2
 234 8.0
 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([glr.c])
 243 AT_TEST([lalr1.cc])
 244 AT_TEST([glr.cc])
 245
 246 m4_popdef([AT_TEST])
 247
 248
 249
 250 ## ---------------- ##
 251 ## Exotic Dollars.  ##
 252 ## ---------------- ##
 253
 254 AT_SETUP([Exotic Dollars])
 255
 256 AT_BISON_OPTION_PUSHDEFS
 257 AT_DATA_GRAMMAR([[input.y]],
 258 [[%define parse.error verbose
 259 %debug
 260 %code {
 261 ]AT_YYERROR_DECLARE[
 262 ]AT_YYLEX_DECLARE[
 263 # define USE(Var)
 264 }
 265
 266 %union
 267 {
 268   int val;
 269 };
 270
 271 %type <val> a_1 a_2 a_5
 272             sum_of_the_five_previous_values
 273
 274 %%
 275 exp: a_1 a_2 { $<val>$ = 3; } { $<val>$ = $<val>3 + 1; } a_5
 276      sum_of_the_five_previous_values
 277     {
 278        USE (($1, $2, $<foo>3, $<foo>4, $5));
 279        printf ("%d\n", $6);
 280     }
 281 ;
 282 a_1: { $$ = 1; };
 283 a_2: { $$ = 2; };
 284 a_5: { $$ = 5; };
 285
 286 sum_of_the_five_previous_values:
 287     {
 288        $$ = $<val>0 + $<val>-1 + $<val>-2 + $<val>-3 + $<val>-4;
 289     }
 290 ;
 291
 292 %%
 293 ]AT_YYERROR_DEFINE[
 294 ]AT_YYLEX_DEFINE[
 295 ]AT_MAIN_DEFINE[
 296 ]])
 297
 298 AT_BISON_CHECK([-d -v -o input.c input.y], 0)
 299 AT_COMPILE([input])
 300 AT_PARSER_CHECK([./input], 0,
 301 [[15
 302 ]])
 303
 304 # Make sure that fields after $n or $-n are parsed correctly.  At one
 305 # point while implementing dashes in symbol names, we were dropping
 306 # fields after $-n.
 307 AT_DATA_GRAMMAR([[input.y]],
 308 [[
 309 %{
 310 ]AT_YYERROR_DECLARE[
 311 ]AT_YYLEX_DECLARE[
 312   typedef struct { int val; } stype;
 313 # define YYSTYPE stype
 314 %}
 315
 316 %%
 317 start: one two { $$.val = $1.val + $2.val; } sum ;
 318 one: { $$.val = 1; } ;
 319 two: { $$.val = 2; } ;
 320 sum: { printf ("%d\n", $0.val + $-1.val + $-2.val); } ;
 321
 322 %%
 323 ]AT_YYERROR_DEFINE[
 324 ]AT_YYLEX_DEFINE[
 325 ]AT_MAIN_DEFINE[
 326 ]])
 327
 328 AT_FULL_COMPILE([input])
 329 AT_PARSER_CHECK([[./input]], [[0]],
 330 [[6
 331 ]])
 332
 333 AT_BISON_OPTION_POPDEFS
 334 AT_CLEANUP
 335
 336
 337
 338 ## -------------------------- ##
 339 ## Printers and Destructors.  ##
 340 ## -------------------------- ##
 341
 342 # _AT_CHECK_PRINTER_AND_DESTRUCTOR($1, $2, $3, $4,
 343 #                                  BISON-DIRECTIVE, UNION-FLAG)
 344 # -------------------------------------------------------------
 345 m4_define([_AT_CHECK_PRINTER_AND_DESTRUCTOR],
 346 [# Make sure complex $n work.
 347 m4_if([$1$2$3$4], $[1]$[2]$[3]$[4], [],
 348        [m4_fatal([$0: Invalid arguments: $@])])dnl
 349
 350 # Be sure to pass all the %directives to this macro to have correct
 351 # helping macros.  So don't put any directly in the Bison file.
 352 AT_BISON_OPTION_PUSHDEFS([$5])
 353 AT_DATA_GRAMMAR([[input.y]],
 354 [[%code requires {
 355 #include <stdio.h>
 356 #include <stdlib.h>
 357 #include <string.h>
 358 #include <assert.h>
 359
 360 #define YYINITDEPTH 10
 361 #define YYMAXDEPTH 10
 362 #define RANGE(Location) ]AT_LALR1_CC_IF([(Location).begin.line, (Location).end.line],
 363       [(Location).first_line, (Location).last_line])[
 364
 365 /* Display the symbol type Symbol.  */
 366 #define V(Symbol, Value, Location, Sep) \
 367    fprintf (stderr, #Symbol " (%d@%d-%d)" Sep, Value, RANGE(Location))
 368 }
 369
 370 $5
 371 ]m4_ifval([$6], [%union
 372 {
 373   int ival;
 374 }])
 375 AT_LALR1_CC_IF([%define global_tokens_and_yystype])
 376 m4_ifval([$6], [[%code provides {]], [[%code {]])
 377 AT_LALR1_CC_IF([typedef yy::location YYLTYPE;])[
 378 ]AT_YYLEX_DECLARE[
 379 ]AT_LALR1_CC_IF([], [AT_YYERROR_DECLARE])
 380 [}
 381
 382 ]m4_ifval([$6], [%type <ival> '(' 'x' 'y' ')' ';' thing line input END])[
 383
 384 /* FIXME: This %printer isn't actually tested.  */
 385 %printer
 386   {
 387     ]AT_LALR1_CC_IF([debug_stream () << $$;],
 388                     [fprintf (yyoutput, "%d", $$)])[;
 389   }
 390   input line thing 'x' 'y'
 391
 392 %destructor
 393   { fprintf (stderr, "Freeing nterm input (%d@%d-%d)\n", $$, RANGE (@$)); }
 394   input
 395
 396 %destructor
 397   { fprintf (stderr, "Freeing nterm line (%d@%d-%d)\n", $$, RANGE (@$)); }
 398   line
 399
 400 %destructor
 401   { fprintf (stderr, "Freeing nterm thing (%d@%d-%d)\n", $$, RANGE (@$)); }
 402   thing
 403
 404 %destructor
 405   { fprintf (stderr, "Freeing token 'x' (%d@%d-%d)\n", $$, RANGE (@$)); }
 406   'x'
 407
 408 %destructor
 409   { fprintf (stderr, "Freeing token 'y' (%d@%d-%d)\n", $$, RANGE (@$)); }
 410   'y'
 411
 412 %token END 0
 413 %destructor
 414   { fprintf (stderr, "Freeing token END (%d@%d-%d)\n", $$, RANGE (@$)); }
 415   END
 416
 417 %%
 418 /*
 419    This grammar is made to exercise error recovery.
 420    "Lines" starting with `(' support error recovery, with
 421    ')' as synchronizing token.  Lines starting with 'x' can never
 422    be recovered from if in error.
 423 */
 424
 425 input:
 426   /* Nothing. */
 427     {
 428       $$ = 0;
 429       V(input, $$, @$, ": /* Nothing */\n");
 430     }
 431 | line input /* Right recursive to load the stack so that popping at
 432                 END can be exercised.  */
 433     {
 434       $$ = 2;
 435       V(input, $$, @$, ": ");
 436       V(line,  $1, @1, " ");
 437       V(input, $2, @2, "\n");
 438     }
 439 ;
 440
 441 line:
 442   thing thing thing ';'
 443     {
 444       $$ = $1;
 445       V(line,  $$, @$, ": ");
 446       V(thing, $1, @1, " ");
 447       V(thing, $2, @2, " ");
 448       V(thing, $3, @3, " ");
 449       V(;,     $4, @4, "\n");
 450     }
 451 | '(' thing thing ')'
 452     {
 453       $$ = $1;
 454       V(line,  $$, @$, ": ");
 455       V('(',   $1, @1, " ");
 456       V(thing, $2, @2, " ");
 457       V(thing, $3, @3, " ");
 458       V(')',   $4, @4, "\n");
 459     }
 460 | '(' thing ')'
 461     {
 462       $$ = $1;
 463       V(line,  $$, @$, ": ");
 464       V('(',   $1, @1, " ");
 465       V(thing, $2, @2, " ");
 466       V(')',   $3, @3, "\n");
 467     }
 468 | '(' error ')'
 469     {
 470       $$ = -1;
 471       V(line,  $$, @$, ": ");
 472       V('(',   $1, @1, " ");
 473       fprintf (stderr, "error (@%d-%d) ", RANGE(@2));
 474       V(')',   $3, @3, "\n");
 475     }
 476 ;
 477
 478 thing:
 479   'x'
 480     {
 481       $$ = $1;
 482       V(thing, $$, @$, ": ");
 483       V('x',   $1, @1, "\n");
 484     }
 485 ;
 486 %%
 487 /* Alias to ARGV[1]. */
 488 const char *source = YY_NULL;
 489
 490 ]AT_YYERROR_DEFINE[
 491
 492 static
 493 ]AT_YYLEX_PROTOTYPE[
 494 {
 495   static unsigned int counter = 0;
 496
 497   int c = ]AT_VAL[]m4_ifval([$6], [.ival])[ = counter++;
 498   /* As in BASIC, line numbers go from 10 to 10.  */
 499   ]AT_LOC_FIRST_LINE[ = ]AT_LOC_FIRST_COLUMN[ = 10 * c;
 500   ]AT_LOC_LAST_LINE[ = ]AT_LOC_LAST_COLUMN[ = ]AT_LOC_FIRST_LINE[ + 9;
 501   assert (0 <= c && c <= strlen (source));
 502   if (source[c])
 503     fprintf (stderr, "sending: '%c'", source[c]);
 504   else
 505     fprintf (stderr, "sending: END");
 506   fprintf (stderr, " (%d@%d-%d)\n", c, RANGE (]AT_LOC[));
 507   return source[c];
 508 }
 509 ]AT_LALR1_CC_IF(
 510 [static bool yydebug;
 511 int
 512 yyparse ()
 513 {
 514   yy::parser parser;
 515   parser.set_debug_level (yydebug);
 516   return parser.parse ();
 517 }
 518 ])[
 519
 520 int
 521 main (int argc, const char *argv[])
 522 {
 523   int status;
 524   yydebug = !!getenv ("YYDEBUG");
 525   assert (argc == 2);
 526   source = argv[1];
 527   status = yyparse ();
 528   switch (status)
 529     {
 530       case 0: fprintf (stderr, "Successful parse.\n"); break;
 531       case 1: fprintf (stderr, "Parsing FAILED.\n"); break;
 532       default: fprintf (stderr, "Parsing FAILED (status %d).\n", status); break;
 533     }
 534   return status;
 535 }
 536 ]])
 537
 538 AT_FULL_COMPILE([input])
 539
 540
 541 # Check the location of "empty"
 542 # -----------------------------
 543 # I.e., epsilon-reductions, as in "(x)" which ends by reducing
 544 # an empty "line" nterm.
 545 # FIXME: This location is not satisfying.  Depend on the lookahead?
 546 AT_PARSER_CHECK([./input '(x)'], 0, [],
 547 [[sending: '(' (0@0-9)
 548 sending: 'x' (1@10-19)
 549 thing (1@10-19): 'x' (1@10-19)
 550 sending: ')' (2@20-29)
 551 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 552 sending: END (3@30-39)
 553 input (0@29-29): /* Nothing */
 554 input (2@0-29): line (0@0-29) input (0@29-29)
 555 Freeing token END (3@30-39)
 556 Freeing nterm input (2@0-29)
 557 Successful parse.
 558 ]])
 559
 560
 561 # Check locations in error recovery
 562 # ---------------------------------
 563 # '(y)' is an error, but can be recovered from.  But what's the location
 564 # of the error itself ('y'), and of the resulting reduction ('(error)').
 565 AT_PARSER_CHECK([./input '(y)'], 0, [],
 566 [[sending: '(' (0@0-9)
 567 sending: 'y' (1@10-19)
 568 10.10-19.18: syntax error, unexpected 'y', expecting 'x'
 569 Freeing token 'y' (1@10-19)
 570 sending: ')' (2@20-29)
 571 line (-1@0-29): '(' (0@0-9) error (@10-19) ')' (2@20-29)
 572 sending: END (3@30-39)
 573 input (0@29-29): /* Nothing */
 574 input (2@0-29): line (-1@0-29) input (0@29-29)
 575 Freeing token END (3@30-39)
 576 Freeing nterm input (2@0-29)
 577 Successful parse.
 578 ]])
 579
 580
 581 # Syntax errors caught by the parser
 582 # ----------------------------------
 583 # Exercise the discarding of stack top and input until `error'
 584 # can be reduced.
 585 #
 586 #     '(', 'x', 'x', 'x', 'x', 'x', ')',
 587 #
 588 # Load the stack and provoke an error that cannot be caught by the
 589 # grammar, to check that the stack is cleared.  And make sure the
 590 # lookahead is freed.
 591 #
 592 #     '(', 'x', ')',
 593 #     '(', 'x', ')',
 594 #     'y'
 595 AT_PARSER_CHECK([./input '(xxxxx)(x)(x)y'], 1, [],
 596 [[sending: '(' (0@0-9)
 597 sending: 'x' (1@10-19)
 598 thing (1@10-19): 'x' (1@10-19)
 599 sending: 'x' (2@20-29)
 600 thing (2@20-29): 'x' (2@20-29)
 601 sending: 'x' (3@30-39)
 602 30.30-39.38: syntax error, unexpected 'x', expecting ')'
 603 Freeing nterm thing (2@20-29)
 604 Freeing nterm thing (1@10-19)
 605 Freeing token 'x' (3@30-39)
 606 sending: 'x' (4@40-49)
 607 Freeing token 'x' (4@40-49)
 608 sending: 'x' (5@50-59)
 609 Freeing token 'x' (5@50-59)
 610 sending: ')' (6@60-69)
 611 line (-1@0-69): '(' (0@0-9) error (@10-59) ')' (6@60-69)
 612 sending: '(' (7@70-79)
 613 sending: 'x' (8@80-89)
 614 thing (8@80-89): 'x' (8@80-89)
 615 sending: ')' (9@90-99)
 616 line (7@70-99): '(' (7@70-79) thing (8@80-89) ')' (9@90-99)
 617 sending: '(' (10@100-109)
 618 sending: 'x' (11@110-119)
 619 thing (11@110-119): 'x' (11@110-119)
 620 sending: ')' (12@120-129)
 621 line (10@100-129): '(' (10@100-109) thing (11@110-119) ')' (12@120-129)
 622 sending: 'y' (13@130-139)
 623 input (0@129-129): /* Nothing */
 624 input (2@100-129): line (10@100-129) input (0@129-129)
 625 input (2@70-129): line (7@70-99) input (2@100-129)
 626 input (2@0-129): line (-1@0-69) input (2@70-129)
 627 130.130-139.138: syntax error, unexpected 'y', expecting END
 628 Freeing nterm input (2@0-129)
 629 Freeing token 'y' (13@130-139)
 630 Parsing FAILED.
 631 ]])
 632
 633
 634 # Syntax error caught by the parser where lookahead = END
 635 # --------------------------------------------------------
 636 # Load the stack and provoke an error that cannot be caught by the
 637 # grammar, to check that the stack is cleared.  And make sure the
 638 # lookahead is freed.
 639 #
 640 #     '(', 'x', ')',
 641 #     '(', 'x', ')',
 642 #     'x'
 643 AT_PARSER_CHECK([./input '(x)(x)x'], 1, [],
 644 [[sending: '(' (0@0-9)
 645 sending: 'x' (1@10-19)
 646 thing (1@10-19): 'x' (1@10-19)
 647 sending: ')' (2@20-29)
 648 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 649 sending: '(' (3@30-39)
 650 sending: 'x' (4@40-49)
 651 thing (4@40-49): 'x' (4@40-49)
 652 sending: ')' (5@50-59)
 653 line (3@30-59): '(' (3@30-39) thing (4@40-49) ')' (5@50-59)
 654 sending: 'x' (6@60-69)
 655 thing (6@60-69): 'x' (6@60-69)
 656 sending: END (7@70-79)
 657 70.70-79.78: syntax error, unexpected END, expecting 'x'
 658 Freeing nterm thing (6@60-69)
 659 Freeing nterm line (3@30-59)
 660 Freeing nterm line (0@0-29)
 661 Freeing token END (7@70-79)
 662 Parsing FAILED.
 663 ]])
 664
 665
 666 # Check destruction upon stack overflow
 667 # -------------------------------------
 668 # Upon stack overflow, all symbols on the stack should be destroyed.
 669 # Only check for yacc.c.
 670 AT_YACC_IF([
 671 AT_PARSER_CHECK([./input '(x)(x)(x)(x)(x)(x)(x)'], 2, [],
 672 [[sending: '(' (0@0-9)
 673 sending: 'x' (1@10-19)
 674 thing (1@10-19): 'x' (1@10-19)
 675 sending: ')' (2@20-29)
 676 line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
 677 sending: '(' (3@30-39)
 678 sending: 'x' (4@40-49)
 679 thing (4@40-49): 'x' (4@40-49)
 680 sending: ')' (5@50-59)
 681 line (3@30-59): '(' (3@30-39) thing (4@40-49) ')' (5@50-59)
 682 sending: '(' (6@60-69)
 683 sending: 'x' (7@70-79)
 684 thing (7@70-79): 'x' (7@70-79)
 685 sending: ')' (8@80-89)
 686 line (6@60-89): '(' (6@60-69) thing (7@70-79) ')' (8@80-89)
 687 sending: '(' (9@90-99)
 688 sending: 'x' (10@100-109)
 689 thing (10@100-109): 'x' (10@100-109)
 690 sending: ')' (11@110-119)
 691 line (9@90-119): '(' (9@90-99) thing (10@100-109) ')' (11@110-119)
 692 sending: '(' (12@120-129)
 693 sending: 'x' (13@130-139)
 694 thing (13@130-139): 'x' (13@130-139)
 695 sending: ')' (14@140-149)
 696 line (12@120-149): '(' (12@120-129) thing (13@130-139) ')' (14@140-149)
 697 sending: '(' (15@150-159)
 698 sending: 'x' (16@160-169)
 699 thing (16@160-169): 'x' (16@160-169)
 700 sending: ')' (17@170-179)
 701 line (15@150-179): '(' (15@150-159) thing (16@160-169) ')' (17@170-179)
 702 sending: '(' (18@180-189)
 703 sending: 'x' (19@190-199)
 704 thing (19@190-199): 'x' (19@190-199)
 705 sending: ')' (20@200-209)
 706 200.200-209.208: memory exhausted
 707 Freeing nterm thing (19@190-199)
 708 Freeing nterm line (15@150-179)
 709 Freeing nterm line (12@120-149)
 710 Freeing nterm line (9@90-119)
 711 Freeing nterm line (6@60-89)
 712 Freeing nterm line (3@30-59)
 713 Freeing nterm line (0@0-29)
 714 Parsing FAILED (status 2).
 715 ]])
 716 ])
 717
 718 AT_BISON_OPTION_POPDEFS
 719 ])# _AT_CHECK_PRINTER_AND_DESTRUCTOR
 720
 721
 722 # AT_CHECK_PRINTER_AND_DESTRUCTOR([BISON-OPTIONS], [UNION-FLAG], [SKIP_FLAG])
 723 # ---------------------------------------------------------------------------
 724 m4_define([AT_CHECK_PRINTER_AND_DESTRUCTOR],
 725 [AT_SETUP([Printers and Destructors$2]m4_ifval([$1], [[: $1]]))
 726
 727 $3
 728 _AT_CHECK_PRINTER_AND_DESTRUCTOR($[1], $[2], $[3], $[4],
 729 [%define parse.error verbose
 730 %debug
 731 %verbose
 732 %locations
 733 $1], [$2])
 734
 735 AT_CLEANUP
 736 ])
 737
 738
 739 AT_CHECK_PRINTER_AND_DESTRUCTOR([])
 740 AT_CHECK_PRINTER_AND_DESTRUCTOR([], [with union])
 741
 742 AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"])
 743 AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"], [with union])
 744
 745 AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser])
 746 AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser], [with union])
 747
 748
 749
 750 ## ----------------------------------------- ##
 751 ## Default tagless %printer and %destructor. ##
 752 ## ----------------------------------------- ##
 753
 754 # Check that the right %printer and %destructor are called, that they're not
 755 # called for $end, and that $$ and @$ work correctly.
 756
 757 AT_SETUP([Default tagless %printer and %destructor])
 758 AT_BISON_OPTION_PUSHDEFS([%locations %debug])
 759 AT_DATA_GRAMMAR([[input.y]],
 760 [[%define parse.error verbose
 761 %debug
 762 %locations
 763
 764 %code {
 765 ]AT_YYLEX_DECLARE[
 766 ]AT_YYERROR_DECLARE[
 767 # define USE(SYM)
 768 }
 769
 770 %printer {
 771   fprintf (yyoutput, "<*> printer should not be called.\n");
 772 } <*>
 773
 774 %printer {
 775   fprintf (yyoutput, "<> printer for '%c' @ %d", $$, @$.first_column);
 776 } <>
 777 %destructor {
 778   fprintf (stdout, "<> destructor for '%c' @ %d.\n", $$, @$.first_column);
 779 } <>
 780
 781 %printer {
 782   fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);
 783 } 'b' 'c'
 784 %destructor {
 785   fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
 786 } 'b' 'c'
 787
 788 %destructor {
 789   fprintf (yyoutput, "<*> destructor should not be called.\n");
 790 } <*>
 791
 792 %%
 793
 794 start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
 795
 796 %%
 797 ]AT_YYERROR_DEFINE[
 798 ]AT_YYLEX_DEFINE(["abcd"], [[yylval = res]])[
 799 ]AT_MAIN_DEFINE[
 800 ]])
 801
 802 AT_BISON_CHECK([-o input.c input.y], [], [],
 803 [[input.y:30.3-5: warning: useless %destructor for type <*> [-Wother]
 804 input.y:30.3-5: warning: useless %printer for type <*> [-Wother]
 805 ]])
 806 AT_COMPILE([input])
 807 AT_PARSER_CHECK([./input --debug], 1,
 808 [[<> destructor for 'd' @ 4.
 809 'b'/'c' destructor for 'c' @ 3.
 810 'b'/'c' destructor for 'b' @ 2.
 811 <> destructor for 'a' @ 1.
 812 ]],
 813 [[Starting parse
 814 Entering state 0
 815 Reading a token: Next token is token 'a' (1.1: <> printer for 'a' @ 1)
 816 Shifting token 'a' (1.1: <> printer for 'a' @ 1)
 817 Entering state 1
 818 Reading a token: Next token is token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 819 Shifting token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 820 Entering state 3
 821 Reading a token: Next token is token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 822 Shifting token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 823 Entering state 5
 824 Reading a token: Next token is token 'd' (1.4: <> printer for 'd' @ 4)
 825 Shifting token 'd' (1.4: <> printer for 'd' @ 4)
 826 Entering state 6
 827 Reading a token: Now at end of input.
 828 1.5: syntax error, unexpected $end, expecting 'e'
 829 Error: popping token 'd' (1.4: <> printer for 'd' @ 4)
 830 Stack now 0 1 3 5
 831 Error: popping token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 832 Stack now 0 1 3
 833 Error: popping token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 834 Stack now 0 1
 835 Error: popping token 'a' (1.1: <> printer for 'a' @ 1)
 836 Stack now 0
 837 Cleanup: discarding lookahead token $end (1.5: )
 838 Stack now 0
 839 ]])
 840
 841 AT_BISON_OPTION_POPDEFS
 842 AT_CLEANUP
 843
 844
 845
 846 ## ------------------------------------------------------ ##
 847 ## Default tagged and per-type %printer and %destructor.  ##
 848 ## ------------------------------------------------------ ##
 849
 850 AT_SETUP([Default tagged and per-type %printer and %destructor])
 851 AT_BISON_OPTION_PUSHDEFS([%debug])
 852 AT_DATA_GRAMMAR([[input.y]],
 853 [[%define parse.error verbose
 854 %debug
 855
 856 %{
 857 ]AT_YYERROR_DECLARE[
 858 ]AT_YYLEX_DECLARE[
 859 # define USE(SYM)
 860 %}
 861
 862 %printer {
 863   fprintf (yyoutput, "<> printer should not be called.\n");
 864 } <>
 865
 866 %union { int field0; int field1; int field2; }
 867 %type <field0> start 'a' 'g'
 868 %type <field1> 'e'
 869 %type <field2> 'f'
 870 %printer {
 871   fprintf (yyoutput, "<*>/<field2>/e printer");
 872 } <*> 'e' <field2>
 873 %destructor {
 874   fprintf (stdout, "<*>/<field2>/e destructor.\n");
 875 } <*> 'e' <field2>
 876
 877 %type <field1> 'b'
 878 %printer { fprintf (yyoutput, "<field1> printer"); } <field1>
 879 %destructor { fprintf (stdout, "<field1> destructor.\n"); } <field1>
 880
 881 %type <field0> 'c'
 882 %printer { fprintf (yyoutput, "'c' printer"); } 'c'
 883 %destructor { fprintf (stdout, "'c' destructor.\n"); } 'c'
 884
 885 %type <field1> 'd'
 886 %printer { fprintf (yyoutput, "'d' printer"); } 'd'
 887 %destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
 888
 889 %destructor {
 890   fprintf (yyoutput, "<> destructor should not be called.\n");
 891 } <>
 892
 893 %%
 894
 895 start:
 896   'a' 'b' 'c' 'd' 'e' 'f' 'g'
 897     {
 898       USE(($1, $2, $3, $4, $5, $6, $7));
 899       $$ = 'S';
 900     }
 901   ;
 902
 903 %%
 904 ]AT_YYERROR_DEFINE[
 905 ]AT_YYLEX_DEFINE(["abcdef"])[
 906 ]AT_MAIN_DEFINE[
 907 ]])
 908
 909 AT_BISON_CHECK([-o input.c input.y], [], [],
 910 [[input.y:22.3-4: warning: useless %destructor for type <> [-Wother]
 911 input.y:22.3-4: warning: useless %printer for type <> [-Wother]
 912 ]])
 913 AT_COMPILE([input])
 914 AT_PARSER_CHECK([./input --debug], 1,
 915 [[<*>/<field2>/e destructor.
 916 <*>/<field2>/e destructor.
 917 'd' destructor.
 918 'c' destructor.
 919 <field1> destructor.
 920 <*>/<field2>/e destructor.
 921 ]],
 922 [[Starting parse
 923 Entering state 0
 924 Reading a token: Next token is token 'a' (<*>/<field2>/e printer)
 925 Shifting token 'a' (<*>/<field2>/e printer)
 926 Entering state 1
 927 Reading a token: Next token is token 'b' (<field1> printer)
 928 Shifting token 'b' (<field1> printer)
 929 Entering state 3
 930 Reading a token: Next token is token 'c' ('c' printer)
 931 Shifting token 'c' ('c' printer)
 932 Entering state 5
 933 Reading a token: Next token is token 'd' ('d' printer)
 934 Shifting token 'd' ('d' printer)
 935 Entering state 6
 936 Reading a token: Next token is token 'e' (<*>/<field2>/e printer)
 937 Shifting token 'e' (<*>/<field2>/e printer)
 938 Entering state 7
 939 Reading a token: Next token is token 'f' (<*>/<field2>/e printer)
 940 Shifting token 'f' (<*>/<field2>/e printer)
 941 Entering state 8
 942 Reading a token: Now at end of input.
 943 syntax error, unexpected $end, expecting 'g'
 944 Error: popping token 'f' (<*>/<field2>/e printer)
 945 Stack now 0 1 3 5 6 7
 946 Error: popping token 'e' (<*>/<field2>/e printer)
 947 Stack now 0 1 3 5 6
 948 Error: popping token 'd' ('d' printer)
 949 Stack now 0 1 3 5
 950 Error: popping token 'c' ('c' printer)
 951 Stack now 0 1 3
 952 Error: popping token 'b' (<field1> printer)
 953 Stack now 0 1
 954 Error: popping token 'a' (<*>/<field2>/e printer)
 955 Stack now 0
 956 Cleanup: discarding lookahead token $end ()
 957 Stack now 0
 958 ]])
 959
 960 AT_BISON_OPTION_POPDEFS
 961 AT_CLEANUP
 962
 963
 964
 965 ## ------------------------------------------------------------- ##
 966 ## Default %printer and %destructor for user-defined end token.  ##
 967 ## ------------------------------------------------------------- ##
 968
 969 AT_SETUP([Default %printer and %destructor for user-defined end token])
 970
 971 # AT_TEST(TYPED)
 972 # --------------
 973 m4_pushdef([AT_TEST],
 974 [m4_if($1, 0,
 975   [m4_pushdef([kind], []) m4_pushdef([not_kind], [*])],
 976   [m4_pushdef([kind], [*]) m4_pushdef([not_kind], [])])
 977
 978 AT_BISON_OPTION_PUSHDEFS([%locations %debug])
 979 AT_DATA_GRAMMAR([[input]]$1[[.y]],
 980 [[%define parse.error verbose
 981 %debug
 982 %locations
 983
 984 %code {
 985 ]AT_YYERROR_DECLARE[
 986 ]AT_YYLEX_DECLARE[
 987 # define USE(SYM)
 988 }
 989
 990 %destructor {
 991   fprintf (yyoutput, "<]]not_kind[[> destructor should not be called.\n");
 992 } <]]not_kind[[>
 993
 994 %token END 0
 995 %printer {
 996   fprintf (yyoutput, "<]]kind[[> for '%c' @ %d", $$, @$.first_column);
 997 } <]]kind[[>
 998 %destructor {
 999   fprintf (stdout, "<]]kind[[> for '%c' @ %d.\n", $$, @$.first_column);
1000 } <]]kind[[>
1001
1002 %printer {
1003   fprintf (yyoutput, "<]]not_kind[[> printer should not be called.\n");
1004 } <]]not_kind[[>
1005
1006 ]]m4_if($1, 0, [[[
1007 ]]],
1008 [[[%union { char tag; }
1009 %type <tag> start END]]])[[
1010
1011 %%
1012
1013 start: { $$ = 'S'; } ;
1014
1015 %%
1016 #include <stdlib.h> // abort
1017 static int
1018 yylex (void)
1019 {
1020   static int called;
1021   if (called++)
1022     abort ();
1023   yylval]]m4_if($1, 0,, [[[.tag]]])[[ = 'E';
1024   yylloc.first_line = yylloc.last_line = 1;
1025   yylloc.first_column = yylloc.last_column = 1;
1026   return 0;
1027 }
1028 ]AT_YYERROR_DEFINE[
1029 ]AT_MAIN_DEFINE[
1030 ]])
1031 AT_BISON_OPTION_POPDEFS
1032
1033 AT_BISON_CHECK([-o input$1.c input$1.y], [], [],
1034 [m4_if([$1], [0],
1035 [[input0.y:30.3-5: warning: useless %destructor for type <*> [-Wother]
1036 input0.y:30.3-5: warning: useless %printer for type <*> [-Wother]
1037 ]],
1038 [[input1.y:30.3-4: warning: useless %destructor for type <> [-Wother]
1039 input1.y:30.3-4: warning: useless %printer for type <> [-Wother]
1040 ]])])
1041
1042 AT_COMPILE([input$1])
1043
1044 AT_PARSER_CHECK([./input$1 --debug], 0,
1045 [[<]]kind[[> for 'E' @ 1.
1046 <]]kind[[> for 'S' @ 1.
1047 ]],
1048 [[Starting parse
1049 Entering state 0
1050 Reducing stack by rule 1 (line 49):
1051 -> $$ = nterm start (1.1: <]]kind[[> for 'S' @ 1)
1052 Stack now 0
1053 Entering state 1
1054 Reading a token: Now at end of input.
1055 Shifting token END (1.1: <]]kind[[> for 'E' @ 1)
1056 Entering state 2
1057 Stack now 0 1 2
1058 Cleanup: popping token END (1.1: <]]kind[[> for 'E' @ 1)
1059 Cleanup: popping nterm start (1.1: <]]kind[[> for 'S' @ 1)
1060 ]])
1061
1062 m4_popdef([kind])
1063 m4_popdef([not_kind])
1064 ])
1065
1066 AT_TEST(0)
1067 AT_TEST(1)
1068
1069 m4_popdef([AT_TEST])
1070
1071 AT_CLEANUP
1072
1073
1074
1075 ## ------------------------------------------------------------------ ##
1076 ## Default %printer and %destructor are not for error or $undefined.  ##
1077 ## ------------------------------------------------------------------ ##
1078
1079 AT_SETUP([Default %printer and %destructor are not for error or $undefined])
1080
1081 # If Bison were to apply the default %printer and %destructor to the error
1082 # token or to $undefined:
1083 #   - For the error token:
1084 #     - It would generate warnings for unused $n.
1085 #     - It would invoke the %printer and %destructor on the error token's
1086 #       semantic value, which would be initialized from the lookahead, which
1087 #       would be destroyed separately.
1088 #   - For $undefined, who knows what the semantic value would be.
1089 AT_BISON_OPTION_PUSHDEFS([%debug])
1090 AT_DATA_GRAMMAR([[input.y]],
1091 [[%debug
1092
1093 %{
1094 # include <stdio.h>
1095 # include <stdlib.h>
1096 ]AT_YYERROR_DECLARE[
1097 ]AT_YYLEX_DECLARE[
1098 # define USE(SYM)
1099 %}
1100
1101 %printer {
1102   fprintf (yyoutput, "'%c'", $$);
1103 } <> <*>
1104 %destructor {
1105   fprintf (stderr, "DESTROY '%c'\n", $$);
1106 } <> <*>
1107
1108 %%
1109
1110 start:
1111   { $$ = 'S'; }
1112   /* In order to reveal the problems that this bug caused during parsing, add
1113    * $2 to USE.  */
1114   | 'a' error 'b' 'c' { USE(($1, $3, $4)); $$ = 'S'; }
1115   ;
1116
1117 %%
1118 ]AT_YYERROR_DEFINE[
1119 ]AT_YYLEX_DEFINE(["abd"], [yylval = res])[
1120 ]AT_MAIN_DEFINE[
1121 ]])
1122 AT_BISON_OPTION_POPDEFS
1123
1124 AT_BISON_CHECK([-o input.c input.y], [], [],
1125 [[input.y:23.6-8: warning: useless %destructor for type <*> [-Wother]
1126 input.y:23.6-8: warning: useless %printer for type <*> [-Wother]
1127 ]])
1128 AT_COMPILE([input])
1129 AT_PARSER_CHECK([./input --debug], [1], [],
1130 [[Starting parse
1131 Entering state 0
1132 Reading a token: Next token is token 'a' ('a')
1133 Shifting token 'a' ('a')
1134 Entering state 1
1135 Reading a token: Next token is token 'b' ('b')
1136 syntax error
1137 Shifting token error ()
1138 Entering state 3
1139 Next token is token 'b' ('b')
1140 Shifting token 'b' ('b')
1141 Entering state 5
1142 Reading a token: Next token is token $undefined ()
1143 Error: popping token 'b' ('b')
1144 DESTROY 'b'
1145 Stack now 0 1 3
1146 Error: popping token error ()
1147 Stack now 0 1
1148 Shifting token error ()
1149 Entering state 3
1150 Next token is token $undefined ()
1151 Error: discarding token $undefined ()
1152 Error: popping token error ()
1153 Stack now 0 1
1154 Shifting token error ()
1155 Entering state 3
1156 Reading a token: Now at end of input.
1157 Cleanup: discarding lookahead token $end ()
1158 Stack now 0 1 3
1159 Cleanup: popping token error ()
1160 Cleanup: popping token 'a' ('a')
1161 DESTROY 'a'
1162 ]])
1163
1164 AT_CLEANUP
1165
1166
1167
1168 ## ------------------------------------------------------ ##
1169 ## Default %printer and %destructor are not for $accept.  ##
1170 ## ------------------------------------------------------ ##
1171
1172 AT_SETUP([Default %printer and %destructor are not for $accept])
1173
1174 # If YYSTYPE is a union and Bison were to apply the default %printer and
1175 # %destructor to $accept:
1176 #   - The %printer and %destructor code generated for $accept would always be
1177 #     dead code because $accept is currently never shifted onto the stack.
1178 #   - $$ for $accept would always be of type YYSTYPE because it's not possible
1179 #     to declare `%type <field> $accept'.  (Also true for $undefined.)
1180 #   - Thus, the compiler might complain that the user code assumes the wrong
1181 #     type for $$ since the code might assume the type associated with a
1182 #     specific union field, which is especially reasonable in C++ since that
1183 #     type may be a base type.  This test case checks for this problem.  (Also
1184 #     true for $undefined and the error token, so there are three warnings for
1185 #     %printer and three for %destructor.)
1186
1187 AT_BISON_OPTION_PUSHDEFS([%debug])
1188 AT_DATA_GRAMMAR([[input.y]],
1189 [[%debug /* So that %printer is actually compiled.  */
1190
1191 %{
1192 # include <stdio.h>
1193 # include <stdlib.h>
1194 ]AT_YYERROR_DECLARE[
1195 ]AT_YYLEX_DECLARE[
1196 # define USE(SYM)
1197 %}
1198
1199 %printer {
1200   char chr = $$;
1201   fprintf (yyoutput, "'%c'", chr);
1202 } <> <*>
1203 %destructor {
1204   char chr = $$;
1205   fprintf (stderr, "DESTROY '%c'\n", chr);
1206 } <> <*>
1207
1208 %union { char chr; }
1209 %type <chr> start
1210
1211 %%
1212
1213 start: { USE($$); } ;
1214
1215 %%
1216 ]AT_YYERROR_DEFINE[
1217 ]AT_YYLEX_DEFINE[
1218 ]AT_MAIN_DEFINE[
1219 ]])
1220 AT_BISON_OPTION_POPDEFS
1221
1222 AT_BISON_CHECK([-o input.c input.y], [], [],
1223 [[input.y:24.3-4: warning: useless %destructor for type <> [-Wother]
1224 input.y:24.3-4: warning: useless %printer for type <> [-Wother]
1225 ]])
1226 AT_COMPILE([input])
1227
1228 AT_CLEANUP
1229
1230
1231
1232 ## ------------------------------------------------------ ##
1233 ## Default %printer and %destructor for mid-rule values.  ##
1234 ## ------------------------------------------------------ ##
1235
1236 AT_SETUP([Default %printer and %destructor for mid-rule values])
1237
1238 AT_BISON_OPTION_PUSHDEFS([%debug])
1239 AT_DATA_GRAMMAR([[input.y]],
1240 [[%debug /* So that %printer is actually compiled.  */
1241
1242 %{
1243 ]AT_YYERROR_DECLARE[
1244 ]AT_YYLEX_DECLARE[
1245 # define USE(SYM)
1246 # define YYLTYPE int
1247 # define YYLLOC_DEFAULT(Current, Rhs, N) (void)(Rhs)
1248 # define LOCATION_PRINT(File, Loc)
1249 %}
1250
1251 %printer { fprintf (yyoutput, "%d", @$); } <>
1252 %destructor { fprintf (stderr, "DESTROY %d\n", @$); } <>
1253 %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1254 %destructor { fprintf (yyoutput, "<*> destructor should not be called"); } <*>
1255
1256 %%
1257
1258 start:
1259   {           @$ = 1; } // Not set or used.
1260   { USE ($$); @$ = 2; } // Both set and used.
1261   { USE ($$); @$ = 3; } // Only set.
1262   {           @$ = 4; } // Only used.
1263   'c'
1264   { USE (($$, $2, $4, $5)); @$ = 0; }
1265   ;
1266
1267 %%
1268 ]AT_YYERROR_DEFINE[
1269 ]AT_YYLEX_DEFINE[
1270 ]AT_MAIN_DEFINE[
1271 ]])
1272 AT_BISON_OPTION_POPDEFS
1273
1274 AT_BISON_CHECK([-o input.c input.y], 0,,
1275 [[input.y:24.70-72: warning: useless %destructor for type <*> [-Wother]
1276 input.y:24.70-72: warning: useless %printer for type <*> [-Wother]
1277 input.y:33.3-23: warning: unset value: $$ [-Wother]
1278 input.y:32.3-23: warning: unused value: $3 [-Wother]
1279 ]])
1280
1281 AT_BISON_CHECK([-fcaret -o input.c input.y], 0,,
1282 [[input.y:24.70-72: warning: useless %destructor for type <*> [-Wother]
1283  %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1284                                                                       ^^^
1285 input.y:24.70-72: warning: useless %printer for type <*> [-Wother]
1286  %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1287                                                                       ^^^
1288 input.y:33.3-23: warning: unset value: $$ [-Wother]
1289    {           @$ = 4; } // Only used.
1290    ^^^^^^^^^^^^^^^^^^^^^
1291 input.y:32.3-23: warning: unused value: $3 [-Wother]
1292    { USE ($$); @$ = 3; } // Only set.
1293    ^^^^^^^^^^^^^^^^^^^^^
1294 ]])
1295
1296 AT_COMPILE([input])
1297 AT_PARSER_CHECK([./input --debug], 1,,
1298 [[Starting parse
1299 Entering state 0
1300 Reducing stack by rule 1 (line 30):
1301 -> $$ = nterm $@1 (: )
1302 Stack now 0
1303 Entering state 2
1304 Reducing stack by rule 2 (line 31):
1305 -> $$ = nterm @2 (: 2)
1306 Stack now 0 2
1307 Entering state 4
1308 Reducing stack by rule 3 (line 32):
1309 -> $$ = nterm @3 (: 3)
1310 Stack now 0 2 4
1311 Entering state 5
1312 Reducing stack by rule 4 (line 33):
1313 -> $$ = nterm @4 (: 4)
1314 Stack now 0 2 4 5
1315 Entering state 6
1316 Reading a token: Now at end of input.
1317 syntax error
1318 Error: popping nterm @4 (: 4)
1319 DESTROY 4
1320 Stack now 0 2 4 5
1321 Error: popping nterm @3 (: 3)
1322 DESTROY 3
1323 Stack now 0 2 4
1324 Error: popping nterm @2 (: 2)
1325 DESTROY 2
1326 Stack now 0 2
1327 Error: popping nterm $@1 (: )
1328 Stack now 0
1329 Cleanup: discarding lookahead token $end (: )
1330 Stack now 0
1331 ]])
1332
1333 AT_CLEANUP
1334
1335
1336 ## ----------------------- ##
1337 ## @$ implies %locations.  ##
1338 ## ----------------------- ##
1339
1340 # Bison once forgot to check for @$ in actions other than semantic actions.
1341
1342 # AT_CHECK_ACTION_LOCATIONS(ACTION-DIRECTIVE)
1343 # -------------------------------------------
1344 m4_define([AT_CHECK_ACTION_LOCATIONS],
1345 [AT_SETUP([[@$ in ]$1[ implies %locations]])
1346 AT_BISON_OPTION_PUSHDEFS([%debug])
1347 AT_DATA_GRAMMAR([[input.y]],
1348 [[%code {
1349   #include <stdio.h>
1350 ]AT_YYERROR_DECLARE[
1351 ]AT_YYLEX_DECLARE[
1352 }
1353
1354 %debug
1355
1356 ]$1[ {
1357   fprintf (stderr, "%d\n", @$.first_line);
1358 } ]m4_if($1, [%initial-action], [], [[start]])[
1359
1360 %%
1361
1362 start:  ;
1363
1364 %%
1365
1366 static int
1367 yylex (void)
1368 {
1369   return 0;
1370 }
1371
1372 ]AT_YYERROR_DEFINE[
1373 ]AT_MAIN_DEFINE[
1374 ]])
1375
1376 AT_BISON_CHECK([[-o input.c input.y]])
1377 AT_COMPILE([[input]])
1378 AT_BISON_OPTION_POPDEFS
1379 AT_CLEANUP])
1380
1381 AT_CHECK_ACTION_LOCATIONS([[%initial-action]])
1382 AT_CHECK_ACTION_LOCATIONS([[%destructor]])
1383 AT_CHECK_ACTION_LOCATIONS([[%printer]])
1384
1385
1386 ## ------------------------- ##
1387 ## Qualified $$ in actions.  ##
1388 ## ------------------------- ##
1389
1390 # Check that we can use qualified $$ (v.g., $<type>$) not only in rule
1391 # actions, but also where $$ is valid: %destructor/%printer and
1392 # %initial-action.
1393 #
1394 # FIXME: Not actually checking %destructor, but it's the same code as
1395 # %printer...
1396 #
1397 # To do that, use a semantic value that has two fields (sem_type),
1398 # declare symbols to have only one of these types (INT, float), and
1399 # use $<type>$ to get the other one.  Including for symbols that are
1400 # not typed (UNTYPED).
1401
1402 m4_pushdef([AT_TEST],
1403 [AT_SETUP([[Qualified $$ in actions: $1]])
1404
1405 AT_BISON_OPTION_PUSHDEFS([%skeleton "$1" %debug])
1406
1407 AT_DATA_GRAMMAR([[input.y]],
1408 [[%skeleton "$1"
1409 %debug
1410 %code requires
1411 {
1412   typedef struct sem_type
1413   {
1414     int ival;
1415     float fval;
1416   } sem_type;
1417
1418 # define YYSTYPE sem_type
1419
1420 ]AT_SKEL_CC_IF([[
1421 # include <iostream>
1422   static void
1423   report (std::ostream& yyo, int ival, float fval)
1424   {
1425     yyo << "ival: " << ival << ", fval: " <<  fval;
1426   }
1427 ]], [[
1428 # include <stdio.h>
1429   static void
1430   report (FILE* yyo, int ival, float fval)
1431   {
1432     fprintf (yyo, "ival: %d, fval: %1.1f", ival, fval);
1433   }
1434 ]])[
1435 }
1436
1437 %code
1438 {
1439   ]AT_YYERROR_DECLARE[
1440   ]AT_YYLEX_DECLARE[
1441 }
1442
1443 %token UNTYPED
1444 %token <ival> INT
1445 %type <fval> float
1446 %printer { report (yyo, $$,       $<fval>$); } <ival>;
1447 %printer { report (yyo, $<ival>$, $$      ); } <fval>;
1448 %printer { report (yyo, $<ival>$, $<fval>$); } <>;
1449
1450 %initial-action
1451 {
1452   $<ival>$ = 42;
1453   $<fval>$ = 4.2;
1454 }
1455
1456 %%
1457 float: UNTYPED INT
1458 {
1459   $$       = $<fval>1 + $<fval>2;
1460   $<ival>$ = $<ival>1 + $][2;
1461 };
1462 %%
1463 ]AT_YYERROR_DEFINE[
1464 ]AT_YYLEX_DEFINE(AT_SKEL_CC_IF([[{yy::parser::token::UNTYPED,
1465                                  yy::parser::token::INT,
1466                                   EOF}]],
1467                                [[{UNTYPED, INT, EOF}]]),
1468                  [AT_VAL.ival = toknum * 10; AT_VAL.fval = toknum / 10.0;])[
1469 ]AT_MAIN_DEFINE[
1470 ]])
1471
1472 AT_FULL_COMPILE([[input]])
1473 AT_PARSER_CHECK([./input --debug], 0, [], [stderr])
1474 # Don't be too picky on the traces, GLR is not exactly the same.  Keep
1475 # only the lines from the printer.
1476 AT_CHECK([[sed -ne '/ival:/p' stderr]], 0,
1477 [[Reading a token: Next token is token UNTYPED (ival: 10, fval: 0.1)
1478 Shifting token UNTYPED (ival: 10, fval: 0.1)
1479 Reading a token: Next token is token INT (ival: 20, fval: 0.2)
1480 Shifting token INT (ival: 20, fval: 0.2)
1481    $][1 = token UNTYPED (ival: 10, fval: 0.1)
1482    $][2 = token INT (ival: 20, fval: 0.2)
1483 -> $$ = nterm float (ival: 30, fval: 0.3)
1484 Cleanup: popping nterm float (ival: 30, fval: 0.3)
1485 ]])
1486
1487 AT_BISON_OPTION_POPDEFS
1488
1489 AT_CLEANUP
1490 ])
1491
1492 AT_TEST([yacc.c])
1493 AT_TEST([glr.c])
1494 AT_TEST([lalr1.cc])
1495 AT_TEST([glr.cc])
1496
1497 m4_popdef([AT_TEST])
1498
1499 ## ----------------------------------------------- ##
1500 ## Fix user actions without a trailing semicolon.  ##
1501 ## ----------------------------------------------- ##
1502
1503 AT_SETUP([[Fix user actions without a trailing semicolon]])
1504
1505 # This feature is undocumented, but we accidentally broke it in 2.3a,
1506 # and there was a complaint at:
1507 # <http://lists.gnu.org/archive/html/bug-bison/2008-11/msg00001.html>.
1508 AT_BISON_OPTION_PUSHDEFS
1509 AT_DATA([input.y],
1510 [[%%
1511 start: test2 test1 test0 testc;
1512
1513 test2
1514 : 'a' { semi;                   /* TEST:N:2 */ }
1515 | 'b' { if (0) {no_semi}        /* TEST:N:2 */ }
1516 | 'c' { if (0) {semi;}          /* TEST:N:2 */ }
1517 | 'd' { semi;   no_semi         /* TEST:Y:2 */ }
1518 | 'e' { semi(); no_semi()       /* TEST:Y:2 */ }
1519 | 'f' { semi[]; no_semi[]       /* TEST:Y:2 */ }
1520 | 'g' { semi++; no_semi++       /* TEST:Y:2 */ }
1521 | 'h' { {no_semi} no_semi       /* TEST:Y:2 */ }
1522 | 'i' { {semi;}   no_semi       /* TEST:Y:2 */ }
1523 ;
1524 test1
1525   : 'a' { semi;                 // TEST:N:1 ;
1526 } | 'b' { if (0) {no_semi}      // TEST:N:1 ;
1527 } | 'c' { if (0) {semi;}        // TEST:N:1 ;
1528 } | 'd' { semi;   no_semi       // TEST:Y:1 ;
1529 } | 'e' { semi(); no_semi()     // TEST:Y:1 ;
1530 } | 'f' { semi[]; no_semi[]     // TEST:Y:1 ;
1531 } | 'g' { semi++; no_semi++     // TEST:Y:1 ;
1532 } | 'h' { {no_semi} no_semi     // TEST:Y:1 ;
1533 } | 'i' { {semi;}   no_semi     // TEST:Y:1 ;
1534 } ;
1535 test0
1536   : 'a' { semi;                 // TEST:N:1 {}
1537 } | 'b' { if (0) {no_semi}      // TEST:N:1 {}
1538 } | 'c' { if (0) {semi;}        // TEST:N:1 {}
1539 } | 'd' { semi;   no_semi       // TEST:Y:1 {}
1540 } | 'e' { semi(); no_semi()     // TEST:Y:1 {}
1541 } | 'f' { semi[]; no_semi[]     // TEST:Y:1 {}
1542 } | 'g' { semi++; no_semi++     // TEST:Y:1 {}
1543 } | 'h' { {no_semi} no_semi     // TEST:Y:1 {}
1544 } | 'i' { {semi;}   no_semi     // TEST:Y:1 {}
1545 } ;
1546
1547 testc
1548 : 'a' {
1549 #define TEST_MACRO_N \
1550 []"broken\" $ @ $$ @$ [];\
1551 string;"}
1552 | 'b' {
1553 no_semi
1554 #define TEST_MACRO_N \
1555 []"broken\" $ @ $$ @$ [];\
1556 string;"}
1557 ]])
1558 AT_BISON_OPTION_POPDEFS
1559
1560 AT_BISON_CHECK([[-o input.c input.y]], [0], [],
1561 [[input.y:8.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1562 input.y:8.48:     future versions of Bison will not add the ';'
1563 input.y:9.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1564 input.y:9.48:     future versions of Bison will not add the ';'
1565 input.y:10.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1566 input.y:10.48:     future versions of Bison will not add the ';'
1567 input.y:11.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1568 input.y:11.48:     future versions of Bison will not add the ';'
1569 input.y:12.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1570 input.y:12.48:     future versions of Bison will not add the ';'
1571 input.y:13.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1572 input.y:13.48:     future versions of Bison will not add the ';'
1573 input.y:20.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1574 input.y:20.1:     future versions of Bison will not add the ';'
1575 input.y:21.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1576 input.y:21.1:     future versions of Bison will not add the ';'
1577 input.y:22.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1578 input.y:22.1:     future versions of Bison will not add the ';'
1579 input.y:23.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1580 input.y:23.1:     future versions of Bison will not add the ';'
1581 input.y:24.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1582 input.y:24.1:     future versions of Bison will not add the ';'
1583 input.y:25.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1584 input.y:25.1:     future versions of Bison will not add the ';'
1585 input.y:31.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1586 input.y:31.1:     future versions of Bison will not add the ';'
1587 input.y:32.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1588 input.y:32.1:     future versions of Bison will not add the ';'
1589 input.y:33.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1590 input.y:33.1:     future versions of Bison will not add the ';'
1591 input.y:34.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1592 input.y:34.1:     future versions of Bison will not add the ';'
1593 input.y:35.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1594 input.y:35.1:     future versions of Bison will not add the ';'
1595 input.y:36.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1596 input.y:36.1:     future versions of Bison will not add the ';'
1597 ]])
1598
1599 AT_MATCHES_CHECK([input.c], [[/\* TEST:N:2 \*/ \}$]],       [[3]])
1600 AT_MATCHES_CHECK([input.c], [[/\* TEST:Y:2 \*/ ;\}$]],      [[6]])
1601 AT_MATCHES_CHECK([input.c], [[// TEST:N:1 [;{}]*\n\}$]],    [[6]])
1602 AT_MATCHES_CHECK([input.c], [[// TEST:Y:1 [;{}]*\n;\}$]],  [[12]])
1603 AT_MATCHES_CHECK([input.c], [[#define TEST_MACRO_N \\\n\[\]"broken\\" \$ \@ \$\$ \@\$ \[\];\\\nstring;"\}]], [[2]])
1604
1605 AT_CLEANUP
1606
1607
1608 ## -------------------------------------------------- ##
1609 ## Destroying lookahead assigned by semantic action.  ##
1610 ## -------------------------------------------------- ##
1611
1612 AT_SETUP([[Destroying lookahead assigned by semantic action]])
1613
1614 AT_BISON_OPTION_PUSHDEFS
1615 AT_DATA_GRAMMAR([input.y],
1616 [[
1617 %code {
1618   #include <assert.h>
1619   #include <stdio.h>
1620 ]AT_YYERROR_DECLARE[
1621 ]AT_YYLEX_DECLARE[
1622   #define USE(Var)
1623 }
1624
1625 %destructor { fprintf (stderr, "'a' destructor\n"); } 'a'
1626 %destructor { fprintf (stderr, "'b' destructor\n"); } 'b'
1627
1628 %%
1629
1630 // In a previous version of Bison, yychar assigned by the semantic
1631 // action below was not translated into yytoken before the lookahead was
1632 // discarded and thus before its destructor (selected according to
1633 // yytoken) was called in order to return from yyparse.  This would
1634 // happen even if YYACCEPT was performed in a later semantic action as
1635 // long as only consistent states with default reductions were visited
1636 // in between.  However, we leave YYACCEPT in the same semantic action
1637 // for this test in order to show that skeletons cannot simply translate
1638 // immediately after every semantic action because a semantic action
1639 // that has set yychar might not always return normally.  Instead,
1640 // skeletons must translate before every use of yytoken.
1641 start: 'a' accept { USE($1); } ;
1642 accept: /*empty*/ {
1643   assert (yychar == YYEMPTY);
1644   yychar = 'b';
1645   YYACCEPT;
1646 } ;
1647
1648 %%
1649 ]AT_YYERROR_DEFINE[
1650 ]AT_YYLEX_DEFINE(["a"])[
1651 ]AT_MAIN_DEFINE[
1652 ]])
1653 AT_BISON_OPTION_POPDEFS
1654 AT_BISON_CHECK([[-o input.c input.y]])
1655 AT_COMPILE([[input]])
1656 AT_PARSER_CHECK([[./input]], [[0]], [],
1657 [['b' destructor
1658 'a' destructor
1659 ]])
1660
1661 AT_CLEANUP
1662
1663 ## ---------- ##
1664 ## YYBACKUP.  ##
1665 ## ---------- ##
1666
1667 AT_SETUP([[YYBACKUP]])
1668
1669 AT_BISON_OPTION_PUSHDEFS([%pure-parser %debug])
1670
1671 AT_DATA_GRAMMAR([input.y],
1672 [[
1673 %error-verbose
1674 %debug
1675 %pure-parser
1676 %code {
1677 # include <stdio.h>
1678 # include <stdlib.h>
1679 # include <assert.h>
1680
1681   ]AT_YYERROR_DECLARE[
1682   ]AT_YYLEX_DECLARE[
1683 }
1684 %%
1685 input:
1686   exp exp {}
1687 ;
1688
1689 exp:
1690   'a'     { printf ("a: %d\n", $1); }
1691 | 'b'     { YYBACKUP('a', 123); }
1692 | 'c' 'd' { YYBACKUP('a', 456); }
1693 ;
1694
1695 %%
1696 ]AT_YYERROR_DEFINE[
1697 ]AT_YYLEX_DEFINE(["bcd"], [*lvalp = (toknum + 1) * 10])[
1698 ]AT_MAIN_DEFINE[
1699 ]])
1700 AT_BISON_OPTION_POPDEFS
1701
1702 AT_BISON_CHECK([[-o input.c input.y]])
1703 AT_COMPILE([[input]])
1704 AT_PARSER_CHECK([[./input]], [[0]],
1705 [[a: 123
1706 a: 456
1707 ]])
1708
1709 AT_CLEANUP