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 %{
  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                       [[YY_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 YY_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 YY_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 # include <stdio.h>
 194 # include <stdlib.h> /* getenv */
 195 ]AT_YYERROR_DECLARE[
 196 ]AT_YYLEX_DECLARE[
 197 }
 198 %%
 199 exp:;
 200 %%
 201 ]AT_YYERROR_DEFINE[
 202 ]AT_YYLEX_DEFINE[
 203
 204 int
 205 main (void)
 206 {
 207 #define TEST(L1, C1, L2, C2)          \
 208   ]AT_LOC_FIRST_LINE[ = L1;           \
 209   ]AT_LOC_FIRST_COLUMN[ = C1;         \
 210   ]AT_LOC_LAST_LINE[ = L2;            \
 211   ]AT_LOC_LAST_COLUMN[ = C2;          \
 212   ]YY_LOCATION_PRINT(stdout, AT_LOC)[;\
 213   putchar ('\n');
 214
 215   TEST(1, 1, 1, 1);
 216   TEST(2, 1, 2, 10);
 217   TEST(3, 1, 4, 1);
 218   TEST(5, 1, 6, 10);
 219
 220   TEST(7, 2, 0, 2);
 221   TEST(8, 0, 8, 0);
 222   return 0;
 223 }
 224 ]])
 225
 226 AT_FULL_COMPILE([input])
 227 AT_PARSER_CHECK([./input], 0,
 228 [[1.1
 229 2.1-9
 230 3.1-4.0
 231 5.1-6.9
 232 7.2
 233 8.0
 234 ]])
 235 AT_BISON_OPTION_POPDEFS
 236 AT_CLEANUP
 237 ])
 238
 239 ## FIXME: test Java, and iterate over skeletons.
 240 AT_TEST([yacc.c])
 241 AT_TEST([glr.c])
 242 #AT_TEST([lalr1.cc])
 243 #AT_TEST([glr.cc])
 244
 245 m4_popdef([AT_TEST])
 246
 247
 248
 249 ## ---------------- ##
 250 ## Exotic Dollars.  ##
 251 ## ---------------- ##
 252
 253 AT_SETUP([Exotic Dollars])
 254
 255 AT_BISON_OPTION_PUSHDEFS
 256 AT_DATA_GRAMMAR([[input.y]],
 257 [[%define parse.error verbose
 258 %debug
 259 %{
 260 ]AT_YYERROR_DECLARE[
 261 ]AT_YYLEX_DECLARE[
 262 # define USE(Var)
 263 %}
 264
 265 %union
 266 {
 267   int val;
 268 };
 269
 270 %type <val> a_1 a_2 a_5
 271             sum_of_the_five_previous_values
 272
 273 %%
 274 exp: a_1 a_2 { $<val>$ = 3; } { $<val>$ = $<val>3 + 1; } a_5
 275      sum_of_the_five_previous_values
 276     {
 277        USE (($1, $2, $<foo>3, $<foo>4, $5));
 278        printf ("%d\n", $6);
 279     }
 280 ;
 281 a_1: { $$ = 1; };
 282 a_2: { $$ = 2; };
 283 a_5: { $$ = 5; };
 284
 285 sum_of_the_five_previous_values:
 286     {
 287        $$ = $<val>0 + $<val>-1 + $<val>-2 + $<val>-3 + $<val>-4;
 288     }
 289 ;
 290
 291 %%
 292 ]AT_YYERROR_DEFINE[
 293 ]AT_YYLEX_DEFINE[
 294 ]AT_MAIN_DEFINE[
 295 ]])
 296
 297 AT_BISON_CHECK([-d -v -o input.c input.y], 0)
 298 AT_COMPILE([input])
 299 AT_PARSER_CHECK([./input], 0,
 300 [[15
 301 ]])
 302
 303 # Make sure that fields after $n or $-n are parsed correctly.  At one
 304 # point while implementing dashes in symbol names, we were dropping
 305 # fields after $-n.
 306 AT_DATA_GRAMMAR([[input.y]],
 307 [[
 308 %{
 309 # include <stdio.h>
 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 %{
 765 # include <stdio.h>
 766 # include <stdlib.h>
 767 ]AT_YYLEX_DECLARE[
 768 ]AT_YYERROR_DECLARE[
 769 # define USE(SYM)
 770 %}
 771
 772 %printer {
 773   fprintf (yyoutput, "<*> printer should not be called.\n");
 774 } <*>
 775
 776 %printer {
 777   fprintf (yyoutput, "<> printer for '%c' @ %d", $$, @$.first_column);
 778 } <>
 779 %destructor {
 780   fprintf (stdout, "<> destructor for '%c' @ %d.\n", $$, @$.first_column);
 781 } <>
 782
 783 %printer {
 784   fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);
 785 } 'b' 'c'
 786 %destructor {
 787   fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
 788 } 'b' 'c'
 789
 790 %destructor {
 791   fprintf (yyoutput, "<*> destructor should not be called.\n");
 792 } <*>
 793
 794 %%
 795
 796 start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
 797
 798 %%
 799 ]AT_YYERROR_DEFINE[
 800 ]AT_YYLEX_DEFINE(["abcd"], [[yylval = res]])[
 801 ]AT_MAIN_DEFINE[
 802 ]])
 803
 804 AT_BISON_CHECK([-o input.c input.y], [], [],
 805 [[input.y:23.3-5: warning: useless %destructor for type <*> [-Wother]
 806 input.y:23.3-5: warning: useless %printer for type <*> [-Wother]
 807 ]])
 808 AT_COMPILE([input])
 809 AT_PARSER_CHECK([./input --debug], 1,
 810 [[<> destructor for 'd' @ 4.
 811 'b'/'c' destructor for 'c' @ 3.
 812 'b'/'c' destructor for 'b' @ 2.
 813 <> destructor for 'a' @ 1.
 814 ]],
 815 [[Starting parse
 816 Entering state 0
 817 Reading a token: Next token is token 'a' (1.1: <> printer for 'a' @ 1)
 818 Shifting token 'a' (1.1: <> printer for 'a' @ 1)
 819 Entering state 1
 820 Reading a token: Next token is token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 821 Shifting token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 822 Entering state 3
 823 Reading a token: Next token is token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 824 Shifting token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 825 Entering state 5
 826 Reading a token: Next token is token 'd' (1.4: <> printer for 'd' @ 4)
 827 Shifting token 'd' (1.4: <> printer for 'd' @ 4)
 828 Entering state 6
 829 Reading a token: Now at end of input.
 830 1.5: syntax error, unexpected $end, expecting 'e'
 831 Error: popping token 'd' (1.4: <> printer for 'd' @ 4)
 832 Stack now 0 1 3 5
 833 Error: popping token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 834 Stack now 0 1 3
 835 Error: popping token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 836 Stack now 0 1
 837 Error: popping token 'a' (1.1: <> printer for 'a' @ 1)
 838 Stack now 0
 839 Cleanup: discarding lookahead token $end (1.5: )
 840 Stack now 0
 841 ]])
 842
 843 AT_BISON_OPTION_POPDEFS
 844 AT_CLEANUP
 845
 846
 847
 848 ## ------------------------------------------------------ ##
 849 ## Default tagged and per-type %printer and %destructor.  ##
 850 ## ------------------------------------------------------ ##
 851
 852 AT_SETUP([Default tagged and per-type %printer and %destructor])
 853 AT_BISON_OPTION_PUSHDEFS([%debug])
 854 AT_DATA_GRAMMAR([[input.y]],
 855 [[%define parse.error verbose
 856 %debug
 857
 858 %{
 859 # include <stdio.h>
 860 # include <stdlib.h>
 861 ]AT_YYERROR_DECLARE[
 862 ]AT_YYLEX_DECLARE[
 863 # define USE(SYM)
 864 %}
 865
 866 %printer {
 867   fprintf (yyoutput, "<> printer should not be called.\n");
 868 } <>
 869
 870 %union { int field0; int field1; int field2; }
 871 %type <field0> start 'a' 'g'
 872 %type <field1> 'e'
 873 %type <field2> 'f'
 874 %printer {
 875   fprintf (yyoutput, "<*>/<field2>/e printer");
 876 } <*> 'e' <field2>
 877 %destructor {
 878   fprintf (stdout, "<*>/<field2>/e destructor.\n");
 879 } <*> 'e' <field2>
 880
 881 %type <field1> 'b'
 882 %printer { fprintf (yyoutput, "<field1> printer"); } <field1>
 883 %destructor { fprintf (stdout, "<field1> destructor.\n"); } <field1>
 884
 885 %type <field0> 'c'
 886 %printer { fprintf (yyoutput, "'c' printer"); } 'c'
 887 %destructor { fprintf (stdout, "'c' destructor.\n"); } 'c'
 888
 889 %type <field1> 'd'
 890 %printer { fprintf (yyoutput, "'d' printer"); } 'd'
 891 %destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
 892
 893 %destructor {
 894   fprintf (yyoutput, "<> destructor should not be called.\n");
 895 } <>
 896
 897 %%
 898
 899 start:
 900   'a' 'b' 'c' 'd' 'e' 'f' 'g'
 901     {
 902       USE(($1, $2, $3, $4, $5, $6, $7));
 903       $$ = 'S';
 904     }
 905   ;
 906
 907 %%
 908 ]AT_YYERROR_DEFINE[
 909 ]AT_YYLEX_DEFINE(["abcdef"])[
 910 ]AT_MAIN_DEFINE[
 911 ]])
 912
 913 AT_BISON_CHECK([-o input.c input.y], [], [],
 914 [[input.y:22.3-4: warning: useless %destructor for type <> [-Wother]
 915 input.y:22.3-4: warning: useless %printer for type <> [-Wother]
 916 ]])
 917 AT_COMPILE([input])
 918 AT_PARSER_CHECK([./input --debug], 1,
 919 [[<*>/<field2>/e destructor.
 920 <*>/<field2>/e destructor.
 921 'd' destructor.
 922 'c' destructor.
 923 <field1> destructor.
 924 <*>/<field2>/e destructor.
 925 ]],
 926 [[Starting parse
 927 Entering state 0
 928 Reading a token: Next token is token 'a' (<*>/<field2>/e printer)
 929 Shifting token 'a' (<*>/<field2>/e printer)
 930 Entering state 1
 931 Reading a token: Next token is token 'b' (<field1> printer)
 932 Shifting token 'b' (<field1> printer)
 933 Entering state 3
 934 Reading a token: Next token is token 'c' ('c' printer)
 935 Shifting token 'c' ('c' printer)
 936 Entering state 5
 937 Reading a token: Next token is token 'd' ('d' printer)
 938 Shifting token 'd' ('d' printer)
 939 Entering state 6
 940 Reading a token: Next token is token 'e' (<*>/<field2>/e printer)
 941 Shifting token 'e' (<*>/<field2>/e printer)
 942 Entering state 7
 943 Reading a token: Next token is token 'f' (<*>/<field2>/e printer)
 944 Shifting token 'f' (<*>/<field2>/e printer)
 945 Entering state 8
 946 Reading a token: Now at end of input.
 947 syntax error, unexpected $end, expecting 'g'
 948 Error: popping token 'f' (<*>/<field2>/e printer)
 949 Stack now 0 1 3 5 6 7
 950 Error: popping token 'e' (<*>/<field2>/e printer)
 951 Stack now 0 1 3 5 6
 952 Error: popping token 'd' ('d' printer)
 953 Stack now 0 1 3 5
 954 Error: popping token 'c' ('c' printer)
 955 Stack now 0 1 3
 956 Error: popping token 'b' (<field1> printer)
 957 Stack now 0 1
 958 Error: popping token 'a' (<*>/<field2>/e printer)
 959 Stack now 0
 960 Cleanup: discarding lookahead token $end ()
 961 Stack now 0
 962 ]])
 963
 964 AT_BISON_OPTION_POPDEFS
 965 AT_CLEANUP
 966
 967
 968
 969 ## ------------------------------------------------------------- ##
 970 ## Default %printer and %destructor for user-defined end token.  ##
 971 ## ------------------------------------------------------------- ##
 972
 973 AT_SETUP([Default %printer and %destructor for user-defined end token])
 974
 975 # AT_TEST(TYPED)
 976 # --------------
 977 m4_pushdef([AT_TEST],
 978 [m4_if($1, 0,
 979   [m4_pushdef([kind], []) m4_pushdef([not_kind], [*])],
 980   [m4_pushdef([kind], [*]) m4_pushdef([not_kind], [])])
 981
 982 AT_BISON_OPTION_PUSHDEFS([%locations %debug])
 983 AT_DATA_GRAMMAR([[input]]$1[[.y]],
 984 [[%define parse.error verbose
 985 %debug
 986 %locations
 987
 988 %{
 989 # include <stdio.h>
 990 # include <stdlib.h>
 991 ]AT_YYERROR_DECLARE[
 992 ]AT_YYLEX_DECLARE[
 993 # define USE(SYM)
 994 %}
 995
 996 %destructor {
 997   fprintf (yyoutput, "<]]not_kind[[> destructor should not be called.\n");
 998 } <]]not_kind[[>
 999
1000 %token END 0
1001 %printer {
1002   fprintf (yyoutput, "<]]kind[[> for '%c' @ %d", $$, @$.first_column);
1003 } <]]kind[[>
1004 %destructor {
1005   fprintf (stdout, "<]]kind[[> for '%c' @ %d.\n", $$, @$.first_column);
1006 } <]]kind[[>
1007
1008 %printer {
1009   fprintf (yyoutput, "<]]not_kind[[> printer should not be called.\n");
1010 } <]]not_kind[[>
1011
1012 ]]m4_if($1, 0, [[[
1013 ]]],
1014 [[[%union { char tag; }
1015 %type <tag> start END]]])[[
1016
1017 %%
1018
1019 start: { $$ = 'S'; } ;
1020
1021 %%
1022
1023 static int
1024 yylex (void)
1025 {
1026   static int called;
1027   if (called++)
1028     abort ();
1029   yylval]]m4_if($1, 0,, [[[.tag]]])[[ = 'E';
1030   yylloc.first_line = yylloc.last_line = 1;
1031   yylloc.first_column = yylloc.last_column = 1;
1032   return 0;
1033 }
1034 ]AT_YYERROR_DEFINE[
1035 ]AT_MAIN_DEFINE[
1036 ]])
1037 AT_BISON_OPTION_POPDEFS
1038
1039 AT_BISON_CHECK([-o input$1.c input$1.y], [], [],
1040 [m4_if([$1], [0],
1041 [[input0.y:23.3-5: warning: useless %destructor for type <*> [-Wother]
1042 input0.y:23.3-5: warning: useless %printer for type <*> [-Wother]
1043 ]],
1044 [[input1.y:23.3-4: warning: useless %destructor for type <> [-Wother]
1045 input1.y:23.3-4: warning: useless %printer for type <> [-Wother]
1046 ]])])
1047
1048 AT_COMPILE([input$1])
1049
1050 AT_PARSER_CHECK([./input$1 --debug], 0,
1051 [[<]]kind[[> for 'E' @ 1.
1052 <]]kind[[> for 'S' @ 1.
1053 ]],
1054 [[Starting parse
1055 Entering state 0
1056 Reducing stack by rule 1 (line 42):
1057 -> $$ = nterm start (1.1: <]]kind[[> for 'S' @ 1)
1058 Stack now 0
1059 Entering state 1
1060 Reading a token: Now at end of input.
1061 Shifting token END (1.1: <]]kind[[> for 'E' @ 1)
1062 Entering state 2
1063 Stack now 0 1 2
1064 Cleanup: popping token END (1.1: <]]kind[[> for 'E' @ 1)
1065 Cleanup: popping nterm start (1.1: <]]kind[[> for 'S' @ 1)
1066 ]])
1067
1068 m4_popdef([kind])
1069 m4_popdef([not_kind])
1070 ])
1071
1072 AT_TEST(0)
1073 AT_TEST(1)
1074
1075 m4_popdef([AT_TEST])
1076
1077 AT_CLEANUP
1078
1079
1080
1081 ## ------------------------------------------------------------------ ##
1082 ## Default %printer and %destructor are not for error or $undefined.  ##
1083 ## ------------------------------------------------------------------ ##
1084
1085 AT_SETUP([Default %printer and %destructor are not for error or $undefined])
1086
1087 # If Bison were to apply the default %printer and %destructor to the error
1088 # token or to $undefined:
1089 #   - For the error token:
1090 #     - It would generate warnings for unused $n.
1091 #     - It would invoke the %printer and %destructor on the error token's
1092 #       semantic value, which would be initialized from the lookahead, which
1093 #       would be destroyed separately.
1094 #   - For $undefined, who knows what the semantic value would be.
1095 AT_BISON_OPTION_PUSHDEFS([%debug])
1096 AT_DATA_GRAMMAR([[input.y]],
1097 [[%debug
1098
1099 %{
1100 # include <stdio.h>
1101 # include <stdlib.h>
1102 ]AT_YYERROR_DECLARE[
1103 ]AT_YYLEX_DECLARE[
1104 # define USE(SYM)
1105 %}
1106
1107 %printer {
1108   fprintf (yyoutput, "'%c'", $$);
1109 } <> <*>
1110 %destructor {
1111   fprintf (stderr, "DESTROY '%c'\n", $$);
1112 } <> <*>
1113
1114 %%
1115
1116 start:
1117   { $$ = 'S'; }
1118   /* In order to reveal the problems that this bug caused during parsing, add
1119    * $2 to USE.  */
1120   | 'a' error 'b' 'c' { USE(($1, $3, $4)); $$ = 'S'; }
1121   ;
1122
1123 %%
1124 ]AT_YYERROR_DEFINE[
1125 ]AT_YYLEX_DEFINE(["abd"], [yylval = res])[
1126 ]AT_MAIN_DEFINE[
1127 ]])
1128 AT_BISON_OPTION_POPDEFS
1129
1130 AT_BISON_CHECK([-o input.c input.y], [], [],
1131 [[input.y:21.6-8: warning: useless %destructor for type <*> [-Wother]
1132 input.y:21.6-8: warning: useless %printer for type <*> [-Wother]
1133 ]])
1134 AT_COMPILE([input])
1135 AT_PARSER_CHECK([./input --debug], [1], [],
1136 [[Starting parse
1137 Entering state 0
1138 Reading a token: Next token is token 'a' ('a')
1139 Shifting token 'a' ('a')
1140 Entering state 1
1141 Reading a token: Next token is token 'b' ('b')
1142 syntax error
1143 Shifting token error ()
1144 Entering state 3
1145 Next token is token 'b' ('b')
1146 Shifting token 'b' ('b')
1147 Entering state 5
1148 Reading a token: Next token is token $undefined ()
1149 Error: popping token 'b' ('b')
1150 DESTROY 'b'
1151 Stack now 0 1 3
1152 Error: popping token error ()
1153 Stack now 0 1
1154 Shifting token error ()
1155 Entering state 3
1156 Next token is token $undefined ()
1157 Error: discarding token $undefined ()
1158 Error: popping token error ()
1159 Stack now 0 1
1160 Shifting token error ()
1161 Entering state 3
1162 Reading a token: Now at end of input.
1163 Cleanup: discarding lookahead token $end ()
1164 Stack now 0 1 3
1165 Cleanup: popping token error ()
1166 Cleanup: popping token 'a' ('a')
1167 DESTROY 'a'
1168 ]])
1169
1170 AT_CLEANUP
1171
1172
1173
1174 ## ------------------------------------------------------ ##
1175 ## Default %printer and %destructor are not for $accept.  ##
1176 ## ------------------------------------------------------ ##
1177
1178 AT_SETUP([Default %printer and %destructor are not for $accept])
1179
1180 # If YYSTYPE is a union and Bison were to apply the default %printer and
1181 # %destructor to $accept:
1182 #   - The %printer and %destructor code generated for $accept would always be
1183 #     dead code because $accept is currently never shifted onto the stack.
1184 #   - $$ for $accept would always be of type YYSTYPE because it's not possible
1185 #     to declare `%type <field> $accept'.  (Also true for $undefined.)
1186 #   - Thus, the compiler might complain that the user code assumes the wrong
1187 #     type for $$ since the code might assume the type associated with a
1188 #     specific union field, which is especially reasonable in C++ since that
1189 #     type may be a base type.  This test case checks for this problem.  (Also
1190 #     true for $undefined and the error token, so there are three warnings for
1191 #     %printer and three for %destructor.)
1192
1193 AT_BISON_OPTION_PUSHDEFS([%debug])
1194 AT_DATA_GRAMMAR([[input.y]],
1195 [[%debug /* So that %printer is actually compiled.  */
1196
1197 %{
1198 # include <stdio.h>
1199 # include <stdlib.h>
1200 ]AT_YYERROR_DECLARE[
1201 ]AT_YYLEX_DECLARE[
1202 # define USE(SYM)
1203 %}
1204
1205 %printer {
1206   char chr = $$;
1207   fprintf (yyoutput, "'%c'", chr);
1208 } <> <*>
1209 %destructor {
1210   char chr = $$;
1211   fprintf (stderr, "DESTROY '%c'\n", chr);
1212 } <> <*>
1213
1214 %union { char chr; }
1215 %type <chr> start
1216
1217 %%
1218
1219 start: { USE($$); } ;
1220
1221 %%
1222 ]AT_YYERROR_DEFINE[
1223 ]AT_YYLEX_DEFINE[
1224 ]AT_MAIN_DEFINE[
1225 ]])
1226 AT_BISON_OPTION_POPDEFS
1227
1228 AT_BISON_CHECK([-o input.c input.y], [], [],
1229 [[input.y:22.3-4: warning: useless %destructor for type <> [-Wother]
1230 input.y:22.3-4: warning: useless %printer for type <> [-Wother]
1231 ]])
1232 AT_COMPILE([input])
1233
1234 AT_CLEANUP
1235
1236
1237
1238 ## ------------------------------------------------------ ##
1239 ## Default %printer and %destructor for mid-rule values.  ##
1240 ## ------------------------------------------------------ ##
1241
1242 AT_SETUP([Default %printer and %destructor for mid-rule values])
1243
1244 AT_BISON_OPTION_PUSHDEFS([%debug])
1245 AT_DATA_GRAMMAR([[input.y]],
1246 [[%debug /* So that %printer is actually compiled.  */
1247
1248 %{
1249 # include <stdio.h>
1250 # include <stdlib.h>
1251 ]AT_YYERROR_DECLARE[
1252 ]AT_YYLEX_DECLARE[
1253 # define USE(SYM)
1254 # define YYLTYPE int
1255 # define YYLLOC_DEFAULT(Current, Rhs, N) (void)(Rhs)
1256 # define YY_LOCATION_PRINT(File, Loc)
1257 %}
1258
1259 %printer { fprintf (yyoutput, "%d", @$); } <>
1260 %destructor { fprintf (stderr, "DESTROY %d\n", @$); } <>
1261 %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1262 %destructor { fprintf (yyoutput, "<*> destructor should not be called"); } <*>
1263
1264 %%
1265
1266 start:
1267   {           @$ = 1; } // Not set or used.
1268   { USE ($$); @$ = 2; } // Both set and used.
1269   { USE ($$); @$ = 3; } // Only set.
1270   {           @$ = 4; } // Only used.
1271   'c'
1272   { USE (($$, $2, $4, $5)); @$ = 0; }
1273   ;
1274
1275 %%
1276 ]AT_YYERROR_DEFINE[
1277 ]AT_YYLEX_DEFINE[
1278 ]AT_MAIN_DEFINE[
1279 ]])
1280 AT_BISON_OPTION_POPDEFS
1281
1282 AT_BISON_CHECK([-o input.c input.y], 0,,
1283 [[input.y:24.70-72: warning: useless %destructor for type <*> [-Wother]
1284 input.y:24.70-72: warning: useless %printer for type <*> [-Wother]
1285 input.y:33.3-23: warning: unset value: $$ [-Wother]
1286 input.y:32.3-23: warning: unused value: $3 [-Wother]
1287 ]])
1288
1289 AT_BISON_CHECK([-fcaret -o input.c input.y], 0,,
1290 [[input.y:24.70-72: warning: useless %destructor for type <*> [-Wother]
1291  %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1292                                                                       ^^^
1293 input.y:24.70-72: warning: useless %printer for type <*> [-Wother]
1294  %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1295                                                                       ^^^
1296 input.y:33.3-23: warning: unset value: $$ [-Wother]
1297    {           @$ = 4; } // Only used.
1298    ^^^^^^^^^^^^^^^^^^^^^
1299 input.y:32.3-23: warning: unused value: $3 [-Wother]
1300    { USE ($$); @$ = 3; } // Only set.
1301    ^^^^^^^^^^^^^^^^^^^^^
1302 ]])
1303
1304 AT_COMPILE([input])
1305 AT_PARSER_CHECK([./input --debug], 1,,
1306 [[Starting parse
1307 Entering state 0
1308 Reducing stack by rule 1 (line 30):
1309 -> $$ = nterm $@1 (: )
1310 Stack now 0
1311 Entering state 2
1312 Reducing stack by rule 2 (line 31):
1313 -> $$ = nterm @2 (: 2)
1314 Stack now 0 2
1315 Entering state 4
1316 Reducing stack by rule 3 (line 32):
1317 -> $$ = nterm @3 (: 3)
1318 Stack now 0 2 4
1319 Entering state 5
1320 Reducing stack by rule 4 (line 33):
1321 -> $$ = nterm @4 (: 4)
1322 Stack now 0 2 4 5
1323 Entering state 6
1324 Reading a token: Now at end of input.
1325 syntax error
1326 Error: popping nterm @4 (: 4)
1327 DESTROY 4
1328 Stack now 0 2 4 5
1329 Error: popping nterm @3 (: 3)
1330 DESTROY 3
1331 Stack now 0 2 4
1332 Error: popping nterm @2 (: 2)
1333 DESTROY 2
1334 Stack now 0 2
1335 Error: popping nterm $@1 (: )
1336 Stack now 0
1337 Cleanup: discarding lookahead token $end (: )
1338 Stack now 0
1339 ]])
1340
1341 AT_CLEANUP
1342
1343
1344 ## ----------------------- ##
1345 ## @$ implies %locations.  ##
1346 ## ----------------------- ##
1347
1348 # Bison once forgot to check for @$ in actions other than semantic actions.
1349
1350 # AT_CHECK_ACTION_LOCATIONS(ACTION-DIRECTIVE)
1351 # -------------------------------------------
1352 m4_define([AT_CHECK_ACTION_LOCATIONS],
1353 [AT_SETUP([[@$ in ]$1[ implies %locations]])
1354 AT_BISON_OPTION_PUSHDEFS([%debug])
1355 AT_DATA_GRAMMAR([[input.y]],
1356 [[%code {
1357   #include <stdio.h>
1358 ]AT_YYERROR_DECLARE[
1359 ]AT_YYLEX_DECLARE[
1360 }
1361
1362 %debug
1363
1364 ]$1[ {
1365   fprintf (stderr, "%d\n", @$.first_line);
1366 } ]m4_if($1, [%initial-action], [], [[start]])[
1367
1368 %%
1369
1370 start:  ;
1371
1372 %%
1373
1374 static int
1375 yylex (void)
1376 {
1377   return 0;
1378 }
1379
1380 ]AT_YYERROR_DEFINE[
1381 ]AT_MAIN_DEFINE[
1382 ]])
1383
1384 AT_BISON_CHECK([[-o input.c input.y]])
1385 AT_COMPILE([[input]])
1386 AT_BISON_OPTION_POPDEFS
1387 AT_CLEANUP])
1388
1389 AT_CHECK_ACTION_LOCATIONS([[%initial-action]])
1390 AT_CHECK_ACTION_LOCATIONS([[%destructor]])
1391 AT_CHECK_ACTION_LOCATIONS([[%printer]])
1392
1393
1394 ## ------------------------- ##
1395 ## Qualified $$ in actions.  ##
1396 ## ------------------------- ##
1397
1398 # Check that we can use qualified $$ (v.g., $<type>$) not only in rule
1399 # actions, but also where $$ is valid: %destructor/%printer and
1400 # %initial-action.
1401 #
1402 # FIXME: Not actually checking %destructor, but it's the same code as
1403 # %printer...
1404 #
1405 # To do that, use a semantic value that has two fields (sem_type),
1406 # declare symbols to have only one of these types (INT, float), and
1407 # use $<type>$ to get the other one.  Including for symbols that are
1408 # not typed (UNTYPED).
1409
1410 m4_pushdef([AT_TEST],
1411 [AT_SETUP([[Qualified $$ in actions: $1]])
1412
1413 AT_BISON_OPTION_PUSHDEFS([%skeleton "$1" %debug])
1414
1415 AT_DATA_GRAMMAR([[input.y]],
1416 [[%skeleton "$1"
1417 %debug
1418 %code requires
1419 {
1420   typedef struct sem_type
1421   {
1422     int ival;
1423     float fval;
1424   } sem_type;
1425
1426 # define YYSTYPE sem_type
1427
1428 ]AT_SKEL_CC_IF([[
1429 # include <iostream>
1430   static void
1431   report (std::ostream& yyo, int ival, float fval)
1432   {
1433     yyo << "ival: " << ival << ", fval: " <<  fval;
1434   }
1435 ]], [[
1436 # include <stdio.h>
1437   static void
1438   report (FILE* yyo, int ival, float fval)
1439   {
1440     fprintf (yyo, "ival: %d, fval: %1.1f", ival, fval);
1441   }
1442 ]])[
1443 }
1444
1445 %code
1446 {
1447   ]AT_YYERROR_DECLARE[
1448   ]AT_YYLEX_DECLARE[
1449 }
1450
1451 %token UNTYPED
1452 %token <ival> INT
1453 %type <fval> float
1454 %printer { report (yyo, $$,       $<fval>$); } <ival>;
1455 %printer { report (yyo, $<ival>$, $$      ); } <fval>;
1456 %printer { report (yyo, $<ival>$, $<fval>$); } <>;
1457
1458 %initial-action
1459 {
1460   $<ival>$ = 42;
1461   $<fval>$ = 4.2;
1462 }
1463
1464 %%
1465 float: UNTYPED INT
1466 {
1467   $$       = $<fval>1 + $<fval>2;
1468   $<ival>$ = $<ival>1 + $][2;
1469 };
1470 %%
1471 ]AT_YYERROR_DEFINE[
1472 ]AT_YYLEX_DEFINE(AT_SKEL_CC_IF([[{yy::parser::token::UNTYPED,
1473                                  yy::parser::token::INT,
1474                                   EOF}]],
1475                                [[{UNTYPED, INT, EOF}]]),
1476                  [AT_VAL.ival = toknum * 10; AT_VAL.fval = toknum / 10.0;])[
1477 ]AT_MAIN_DEFINE[
1478 ]])
1479
1480 AT_FULL_COMPILE([[input]])
1481 AT_PARSER_CHECK([./input --debug], 0, [], [stderr])
1482 # Don't be too picky on the traces, GLR is not exactly the same.  Keep
1483 # only the lines from the printer.
1484 AT_CHECK([[sed -ne '/ival:/p' stderr]], 0,
1485 [[Reading a token: Next token is token UNTYPED (ival: 10, fval: 0.1)
1486 Shifting token UNTYPED (ival: 10, fval: 0.1)
1487 Reading a token: Next token is token INT (ival: 20, fval: 0.2)
1488 Shifting token INT (ival: 20, fval: 0.2)
1489    $][1 = token UNTYPED (ival: 10, fval: 0.1)
1490    $][2 = token INT (ival: 20, fval: 0.2)
1491 -> $$ = nterm float (ival: 30, fval: 0.3)
1492 Cleanup: popping nterm float (ival: 30, fval: 0.3)
1493 ]])
1494
1495 AT_BISON_OPTION_POPDEFS
1496
1497 AT_CLEANUP
1498 ])
1499
1500 AT_TEST([yacc.c])
1501 AT_TEST([glr.c])
1502 AT_TEST([lalr1.cc])
1503 AT_TEST([glr.cc])
1504
1505 m4_popdef([AT_TEST])
1506
1507 ## ----------------------------------------------- ##
1508 ## Fix user actions without a trailing semicolon.  ##
1509 ## ----------------------------------------------- ##
1510
1511 AT_SETUP([[Fix user actions without a trailing semicolon]])
1512
1513 # This feature is undocumented, but we accidentally broke it in 2.3a,
1514 # and there was a complaint at:
1515 # <http://lists.gnu.org/archive/html/bug-bison/2008-11/msg00001.html>.
1516 AT_BISON_OPTION_PUSHDEFS
1517 AT_DATA([input.y],
1518 [[%%
1519 start: test2 test1 test0 testc;
1520
1521 test2
1522 : 'a' { semi;                   /* TEST:N:2 */ }
1523 | 'b' { if (0) {no_semi}        /* TEST:N:2 */ }
1524 | 'c' { if (0) {semi;}          /* TEST:N:2 */ }
1525 | 'd' { semi;   no_semi         /* TEST:Y:2 */ }
1526 | 'e' { semi(); no_semi()       /* TEST:Y:2 */ }
1527 | 'f' { semi[]; no_semi[]       /* TEST:Y:2 */ }
1528 | 'g' { semi++; no_semi++       /* TEST:Y:2 */ }
1529 | 'h' { {no_semi} no_semi       /* TEST:Y:2 */ }
1530 | 'i' { {semi;}   no_semi       /* TEST:Y:2 */ }
1531 ;
1532 test1
1533   : 'a' { semi;                 // TEST:N:1 ;
1534 } | 'b' { if (0) {no_semi}      // TEST:N:1 ;
1535 } | 'c' { if (0) {semi;}        // TEST:N:1 ;
1536 } | 'd' { semi;   no_semi       // TEST:Y:1 ;
1537 } | 'e' { semi(); no_semi()     // TEST:Y:1 ;
1538 } | 'f' { semi[]; no_semi[]     // TEST:Y:1 ;
1539 } | 'g' { semi++; no_semi++     // TEST:Y:1 ;
1540 } | 'h' { {no_semi} no_semi     // TEST:Y:1 ;
1541 } | 'i' { {semi;}   no_semi     // TEST:Y:1 ;
1542 } ;
1543 test0
1544   : 'a' { semi;                 // TEST:N:1 {}
1545 } | 'b' { if (0) {no_semi}      // TEST:N:1 {}
1546 } | 'c' { if (0) {semi;}        // TEST:N:1 {}
1547 } | 'd' { semi;   no_semi       // TEST:Y:1 {}
1548 } | 'e' { semi(); no_semi()     // TEST:Y:1 {}
1549 } | 'f' { semi[]; no_semi[]     // TEST:Y:1 {}
1550 } | 'g' { semi++; no_semi++     // TEST:Y:1 {}
1551 } | 'h' { {no_semi} no_semi     // TEST:Y:1 {}
1552 } | 'i' { {semi;}   no_semi     // TEST:Y:1 {}
1553 } ;
1554
1555 testc
1556 : 'a' {
1557 #define TEST_MACRO_N \
1558 []"broken\" $ @ $$ @$ [];\
1559 string;"}
1560 | 'b' {
1561 no_semi
1562 #define TEST_MACRO_N \
1563 []"broken\" $ @ $$ @$ [];\
1564 string;"}
1565 ]])
1566 AT_BISON_OPTION_POPDEFS
1567
1568 AT_BISON_CHECK([[-o input.c input.y]], [0], [],
1569 [[input.y:8.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1570 input.y:8.48:     future versions of Bison will not add the ';'
1571 input.y:9.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1572 input.y:9.48:     future versions of Bison will not add the ';'
1573 input.y:10.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1574 input.y:10.48:     future versions of Bison will not add the ';'
1575 input.y:11.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1576 input.y:11.48:     future versions of Bison will not add the ';'
1577 input.y:12.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1578 input.y:12.48:     future versions of Bison will not add the ';'
1579 input.y:13.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1580 input.y:13.48:     future versions of Bison will not add the ';'
1581 input.y:20.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1582 input.y:20.1:     future versions of Bison will not add the ';'
1583 input.y:21.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1584 input.y:21.1:     future versions of Bison will not add the ';'
1585 input.y:22.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1586 input.y:22.1:     future versions of Bison will not add the ';'
1587 input.y:23.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1588 input.y:23.1:     future versions of Bison will not add the ';'
1589 input.y:24.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1590 input.y:24.1:     future versions of Bison will not add the ';'
1591 input.y:25.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1592 input.y:25.1:     future versions of Bison will not add the ';'
1593 input.y:31.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1594 input.y:31.1:     future versions of Bison will not add the ';'
1595 input.y:32.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1596 input.y:32.1:     future versions of Bison will not add the ';'
1597 input.y:33.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1598 input.y:33.1:     future versions of Bison will not add the ';'
1599 input.y:34.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1600 input.y:34.1:     future versions of Bison will not add the ';'
1601 input.y:35.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1602 input.y:35.1:     future versions of Bison will not add the ';'
1603 input.y:36.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1604 input.y:36.1:     future versions of Bison will not add the ';'
1605 ]])
1606
1607 AT_MATCHES_CHECK([input.c], [[/\* TEST:N:2 \*/ \}$]],       [[3]])
1608 AT_MATCHES_CHECK([input.c], [[/\* TEST:Y:2 \*/ ;\}$]],      [[6]])
1609 AT_MATCHES_CHECK([input.c], [[// TEST:N:1 [;{}]*\n\}$]],    [[6]])
1610 AT_MATCHES_CHECK([input.c], [[// TEST:Y:1 [;{}]*\n;\}$]],  [[12]])
1611 AT_MATCHES_CHECK([input.c], [[#define TEST_MACRO_N \\\n\[\]"broken\\" \$ \@ \$\$ \@\$ \[\];\\\nstring;"\}]], [[2]])
1612
1613 AT_CLEANUP
1614
1615
1616 ## -------------------------------------------------- ##
1617 ## Destroying lookahead assigned by semantic action.  ##
1618 ## -------------------------------------------------- ##
1619
1620 AT_SETUP([[Destroying lookahead assigned by semantic action]])
1621
1622 AT_BISON_OPTION_PUSHDEFS
1623 AT_DATA_GRAMMAR([input.y],
1624 [[
1625 %code {
1626   #include <assert.h>
1627   #include <stdio.h>
1628 ]AT_YYERROR_DECLARE[
1629 ]AT_YYLEX_DECLARE[
1630   #define USE(Var)
1631 }
1632
1633 %destructor { fprintf (stderr, "'a' destructor\n"); } 'a'
1634 %destructor { fprintf (stderr, "'b' destructor\n"); } 'b'
1635
1636 %%
1637
1638 // In a previous version of Bison, yychar assigned by the semantic
1639 // action below was not translated into yytoken before the lookahead was
1640 // discarded and thus before its destructor (selected according to
1641 // yytoken) was called in order to return from yyparse.  This would
1642 // happen even if YYACCEPT was performed in a later semantic action as
1643 // long as only consistent states with default reductions were visited
1644 // in between.  However, we leave YYACCEPT in the same semantic action
1645 // for this test in order to show that skeletons cannot simply translate
1646 // immediately after every semantic action because a semantic action
1647 // that has set yychar might not always return normally.  Instead,
1648 // skeletons must translate before every use of yytoken.
1649 start: 'a' accept { USE($1); } ;
1650 accept: /*empty*/ {
1651   assert (yychar == YYEMPTY);
1652   yychar = 'b';
1653   YYACCEPT;
1654 } ;
1655
1656 %%
1657 ]AT_YYERROR_DEFINE[
1658 ]AT_YYLEX_DEFINE(["a"])[
1659 ]AT_MAIN_DEFINE[
1660 ]])
1661 AT_BISON_OPTION_POPDEFS
1662 AT_BISON_CHECK([[-o input.c input.y]])
1663 AT_COMPILE([[input]])
1664 AT_PARSER_CHECK([[./input]], [[0]], [],
1665 [['b' destructor
1666 'a' destructor
1667 ]])
1668
1669 AT_CLEANUP
1670
1671 ## ---------- ##
1672 ## YYBACKUP.  ##
1673 ## ---------- ##
1674
1675 AT_SETUP([[YYBACKUP]])
1676
1677 AT_BISON_OPTION_PUSHDEFS([%pure-parser %debug])
1678
1679 AT_DATA_GRAMMAR([input.y],
1680 [[
1681 %error-verbose
1682 %debug
1683 %pure-parser
1684 %code {
1685 # include <stdio.h>
1686 # include <stdlib.h>
1687 # include <assert.h>
1688
1689   ]AT_YYERROR_DECLARE[
1690   ]AT_YYLEX_DECLARE[
1691 }
1692 %%
1693 input:
1694   exp exp {}
1695 ;
1696
1697 exp:
1698   'a'     { printf ("a: %d\n", $1); }
1699 | 'b'     { YYBACKUP('a', 123); }
1700 | 'c' 'd' { YYBACKUP('a', 456); }
1701 ;
1702
1703 %%
1704 ]AT_YYERROR_DEFINE[
1705 ]AT_YYLEX_DEFINE(["bcd"], [*lvalp = (toknum + 1) * 10])[
1706 ]AT_MAIN_DEFINE[
1707 ]])
1708 AT_BISON_OPTION_POPDEFS
1709
1710 AT_BISON_CHECK([[-o input.c input.y]])
1711 AT_COMPILE([[input]])
1712 AT_PARSER_CHECK([[./input]], [[0]],
1713 [[a: 123
1714 a: 456
1715 ]])
1716
1717 AT_CLEANUP