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])
 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
 802 int
 803 main (void)
 804 {
 805   yydebug = 1;
 806   return yyparse ();
 807 }
 808 ]])
 809
 810 AT_BISON_CHECK([-o input.c input.y], [], [],
 811 [[input.y:23.3-5: warning: useless %destructor for type <*> [-Wother]
 812 input.y:23.3-5: warning: useless %printer for type <*> [-Wother]
 813 ]])
 814 AT_COMPILE([input])
 815 AT_PARSER_CHECK([./input], 1,
 816 [[<> destructor for 'd' @ 4.
 817 'b'/'c' destructor for 'c' @ 3.
 818 'b'/'c' destructor for 'b' @ 2.
 819 <> destructor for 'a' @ 1.
 820 ]],
 821 [[Starting parse
 822 Entering state 0
 823 Reading a token: Next token is token 'a' (1.1: <> printer for 'a' @ 1)
 824 Shifting token 'a' (1.1: <> printer for 'a' @ 1)
 825 Entering state 1
 826 Reading a token: Next token is token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 827 Shifting token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 828 Entering state 3
 829 Reading a token: Next token is token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 830 Shifting token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 831 Entering state 5
 832 Reading a token: Next token is token 'd' (1.4: <> printer for 'd' @ 4)
 833 Shifting token 'd' (1.4: <> printer for 'd' @ 4)
 834 Entering state 6
 835 Reading a token: Now at end of input.
 836 1.5: syntax error, unexpected $end, expecting 'e'
 837 Error: popping token 'd' (1.4: <> printer for 'd' @ 4)
 838 Stack now 0 1 3 5
 839 Error: popping token 'c' (1.3: 'b'/'c' printer for 'c' @ 3)
 840 Stack now 0 1 3
 841 Error: popping token 'b' (1.2: 'b'/'c' printer for 'b' @ 2)
 842 Stack now 0 1
 843 Error: popping token 'a' (1.1: <> printer for 'a' @ 1)
 844 Stack now 0
 845 Cleanup: discarding lookahead token $end (1.5: )
 846 Stack now 0
 847 ]])
 848
 849 AT_BISON_OPTION_POPDEFS
 850 AT_CLEANUP
 851
 852
 853
 854 ## ------------------------------------------------------ ##
 855 ## Default tagged and per-type %printer and %destructor.  ##
 856 ## ------------------------------------------------------ ##
 857
 858 AT_SETUP([Default tagged and per-type %printer and %destructor])
 859 AT_BISON_OPTION_PUSHDEFS
 860 AT_DATA_GRAMMAR([[input.y]],
 861 [[%define parse.error verbose
 862 %debug
 863
 864 %{
 865 # include <stdio.h>
 866 # include <stdlib.h>
 867 ]AT_YYERROR_DECLARE[
 868 ]AT_YYLEX_DECLARE[
 869 # define USE(SYM)
 870 %}
 871
 872 %printer {
 873   fprintf (yyoutput, "<> printer should not be called.\n");
 874 } <>
 875
 876 %union { int field0; int field1; int field2; }
 877 %type <field0> start 'a' 'g'
 878 %type <field1> 'e'
 879 %type <field2> 'f'
 880 %printer {
 881   fprintf (yyoutput, "<*>/<field2>/e printer");
 882 } <*> 'e' <field2>
 883 %destructor {
 884   fprintf (stdout, "<*>/<field2>/e destructor.\n");
 885 } <*> 'e' <field2>
 886
 887 %type <field1> 'b'
 888 %printer { fprintf (yyoutput, "<field1> printer"); } <field1>
 889 %destructor { fprintf (stdout, "<field1> destructor.\n"); } <field1>
 890
 891 %type <field0> 'c'
 892 %printer { fprintf (yyoutput, "'c' printer"); } 'c'
 893 %destructor { fprintf (stdout, "'c' destructor.\n"); } 'c'
 894
 895 %type <field1> 'd'
 896 %printer { fprintf (yyoutput, "'d' printer"); } 'd'
 897 %destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
 898
 899 %destructor {
 900   fprintf (yyoutput, "<> destructor should not be called.\n");
 901 } <>
 902
 903 %%
 904
 905 start:
 906   'a' 'b' 'c' 'd' 'e' 'f' 'g'
 907     {
 908       USE(($1, $2, $3, $4, $5, $6, $7));
 909       $$ = 'S';
 910     }
 911   ;
 912
 913 %%
 914 ]AT_YYERROR_DEFINE[
 915 ]AT_YYLEX_DEFINE(["abcdef"])[
 916
 917 int
 918 main (void)
 919 {
 920   yydebug = 1;
 921   return yyparse ();
 922 }
 923 ]])
 924
 925 AT_BISON_CHECK([-o input.c input.y], [], [],
 926 [[input.y:22.3-4: warning: useless %destructor for type <> [-Wother]
 927 input.y:22.3-4: warning: useless %printer for type <> [-Wother]
 928 ]])
 929 AT_COMPILE([input])
 930 AT_PARSER_CHECK([./input], 1,
 931 [[<*>/<field2>/e destructor.
 932 <*>/<field2>/e destructor.
 933 'd' destructor.
 934 'c' destructor.
 935 <field1> destructor.
 936 <*>/<field2>/e destructor.
 937 ]],
 938 [[Starting parse
 939 Entering state 0
 940 Reading a token: Next token is token 'a' (<*>/<field2>/e printer)
 941 Shifting token 'a' (<*>/<field2>/e printer)
 942 Entering state 1
 943 Reading a token: Next token is token 'b' (<field1> printer)
 944 Shifting token 'b' (<field1> printer)
 945 Entering state 3
 946 Reading a token: Next token is token 'c' ('c' printer)
 947 Shifting token 'c' ('c' printer)
 948 Entering state 5
 949 Reading a token: Next token is token 'd' ('d' printer)
 950 Shifting token 'd' ('d' printer)
 951 Entering state 6
 952 Reading a token: Next token is token 'e' (<*>/<field2>/e printer)
 953 Shifting token 'e' (<*>/<field2>/e printer)
 954 Entering state 7
 955 Reading a token: Next token is token 'f' (<*>/<field2>/e printer)
 956 Shifting token 'f' (<*>/<field2>/e printer)
 957 Entering state 8
 958 Reading a token: Now at end of input.
 959 syntax error, unexpected $end, expecting 'g'
 960 Error: popping token 'f' (<*>/<field2>/e printer)
 961 Stack now 0 1 3 5 6 7
 962 Error: popping token 'e' (<*>/<field2>/e printer)
 963 Stack now 0 1 3 5 6
 964 Error: popping token 'd' ('d' printer)
 965 Stack now 0 1 3 5
 966 Error: popping token 'c' ('c' printer)
 967 Stack now 0 1 3
 968 Error: popping token 'b' (<field1> printer)
 969 Stack now 0 1
 970 Error: popping token 'a' (<*>/<field2>/e printer)
 971 Stack now 0
 972 Cleanup: discarding lookahead token $end ()
 973 Stack now 0
 974 ]])
 975
 976 AT_BISON_OPTION_POPDEFS
 977 AT_CLEANUP
 978
 979
 980
 981 ## ------------------------------------------------------------- ##
 982 ## Default %printer and %destructor for user-defined end token.  ##
 983 ## ------------------------------------------------------------- ##
 984
 985 AT_SETUP([Default %printer and %destructor for user-defined end token])
 986
 987 # AT_TEST(TYPED)
 988 # --------------
 989 m4_pushdef([AT_TEST],
 990 [m4_if($1, 0,
 991   [m4_pushdef([kind], []) m4_pushdef([not_kind], [*])],
 992   [m4_pushdef([kind], [*]) m4_pushdef([not_kind], [])])
 993
 994 AT_BISON_OPTION_PUSHDEFS([%locations])
 995 AT_DATA_GRAMMAR([[input]]$1[[.y]],
 996 [[%define parse.error verbose
 997 %debug
 998 %locations
 999
1000 %{
1001 # include <stdio.h>
1002 # include <stdlib.h>
1003 ]AT_YYERROR_DECLARE[
1004 ]AT_YYLEX_DECLARE[
1005 # define USE(SYM)
1006 %}
1007
1008 %destructor {
1009   fprintf (yyoutput, "<]]not_kind[[> destructor should not be called.\n");
1010 } <]]not_kind[[>
1011
1012 %token END 0
1013 %printer {
1014   fprintf (yyoutput, "<]]kind[[> for '%c' @ %d", $$, @$.first_column);
1015 } <]]kind[[>
1016 %destructor {
1017   fprintf (stdout, "<]]kind[[> for '%c' @ %d.\n", $$, @$.first_column);
1018 } <]]kind[[>
1019
1020 %printer {
1021   fprintf (yyoutput, "<]]not_kind[[> printer should not be called.\n");
1022 } <]]not_kind[[>
1023
1024 ]]m4_if($1, 0, [[[
1025 ]]],
1026 [[[%union { char tag; }
1027 %type <tag> start END]]])[[
1028
1029 %%
1030
1031 start: { $$ = 'S'; } ;
1032
1033 %%
1034
1035 static int
1036 yylex (void)
1037 {
1038   static int called;
1039   if (called++)
1040     abort ();
1041   yylval]]m4_if($1, 0,, [[[.tag]]])[[ = 'E';
1042   yylloc.first_line = yylloc.last_line = 1;
1043   yylloc.first_column = yylloc.last_column = 1;
1044   return 0;
1045 }
1046 ]AT_YYERROR_DEFINE[
1047
1048 int
1049 main (void)
1050 {
1051   yydebug = 1;
1052   return yyparse ();
1053 }
1054 ]])
1055 AT_BISON_OPTION_POPDEFS
1056
1057 AT_BISON_CHECK([-o input$1.c input$1.y], [], [],
1058 [m4_if([$1], [0],
1059 [[input0.y:23.3-5: warning: useless %destructor for type <*> [-Wother]
1060 input0.y:23.3-5: warning: useless %printer for type <*> [-Wother]
1061 ]],
1062 [[input1.y:23.3-4: warning: useless %destructor for type <> [-Wother]
1063 input1.y:23.3-4: warning: useless %printer for type <> [-Wother]
1064 ]])])
1065
1066 AT_COMPILE([input$1])
1067
1068 AT_PARSER_CHECK([./input$1], 0,
1069 [[<]]kind[[> for 'E' @ 1.
1070 <]]kind[[> for 'S' @ 1.
1071 ]],
1072 [[Starting parse
1073 Entering state 0
1074 Reducing stack by rule 1 (line 42):
1075 -> $$ = nterm start (1.1: <]]kind[[> for 'S' @ 1)
1076 Stack now 0
1077 Entering state 1
1078 Reading a token: Now at end of input.
1079 Shifting token END (1.1: <]]kind[[> for 'E' @ 1)
1080 Entering state 2
1081 Stack now 0 1 2
1082 Cleanup: popping token END (1.1: <]]kind[[> for 'E' @ 1)
1083 Cleanup: popping nterm start (1.1: <]]kind[[> for 'S' @ 1)
1084 ]])
1085
1086 m4_popdef([kind])
1087 m4_popdef([not_kind])
1088 ])
1089
1090 AT_TEST(0)
1091 AT_TEST(1)
1092
1093 m4_popdef([AT_TEST])
1094
1095 AT_CLEANUP
1096
1097
1098
1099 ## ------------------------------------------------------------------ ##
1100 ## Default %printer and %destructor are not for error or $undefined.  ##
1101 ## ------------------------------------------------------------------ ##
1102
1103 AT_SETUP([Default %printer and %destructor are not for error or $undefined])
1104
1105 # If Bison were to apply the default %printer and %destructor to the error
1106 # token or to $undefined:
1107 #   - For the error token:
1108 #     - It would generate warnings for unused $n.
1109 #     - It would invoke the %printer and %destructor on the error token's
1110 #       semantic value, which would be initialized from the lookahead, which
1111 #       would be destroyed separately.
1112 #   - For $undefined, who knows what the semantic value would be.
1113 AT_BISON_OPTION_PUSHDEFS
1114 AT_DATA_GRAMMAR([[input.y]],
1115 [[%debug
1116
1117 %{
1118 # include <stdio.h>
1119 # include <stdlib.h>
1120 ]AT_YYERROR_DECLARE[
1121 ]AT_YYLEX_DECLARE[
1122 # define USE(SYM)
1123 %}
1124
1125 %printer {
1126   fprintf (yyoutput, "'%c'", $$);
1127 } <> <*>
1128 %destructor {
1129   fprintf (stderr, "DESTROY '%c'\n", $$);
1130 } <> <*>
1131
1132 %%
1133
1134 start:
1135   { $$ = 'S'; }
1136   /* In order to reveal the problems that this bug caused during parsing, add
1137    * $2 to USE.  */
1138   | 'a' error 'b' 'c' { USE(($1, $3, $4)); $$ = 'S'; }
1139   ;
1140
1141 %%
1142 ]AT_YYERROR_DEFINE[
1143 ]AT_YYLEX_DEFINE(["abd"], [yylval = res])[
1144 int
1145 main (void)
1146 {
1147   yydebug = 1;
1148   return yyparse ();
1149 }
1150 ]])
1151 AT_BISON_OPTION_POPDEFS
1152
1153 AT_BISON_CHECK([-o input.c input.y], [], [],
1154 [[input.y:21.6-8: warning: useless %destructor for type <*> [-Wother]
1155 input.y:21.6-8: warning: useless %printer for type <*> [-Wother]
1156 ]])
1157 AT_COMPILE([input])
1158 AT_PARSER_CHECK([./input], [1], [],
1159 [[Starting parse
1160 Entering state 0
1161 Reading a token: Next token is token 'a' ('a')
1162 Shifting token 'a' ('a')
1163 Entering state 1
1164 Reading a token: Next token is token 'b' ('b')
1165 syntax error
1166 Shifting token error ()
1167 Entering state 3
1168 Next token is token 'b' ('b')
1169 Shifting token 'b' ('b')
1170 Entering state 5
1171 Reading a token: Next token is token $undefined ()
1172 Error: popping token 'b' ('b')
1173 DESTROY 'b'
1174 Stack now 0 1 3
1175 Error: popping token error ()
1176 Stack now 0 1
1177 Shifting token error ()
1178 Entering state 3
1179 Next token is token $undefined ()
1180 Error: discarding token $undefined ()
1181 Error: popping token error ()
1182 Stack now 0 1
1183 Shifting token error ()
1184 Entering state 3
1185 Reading a token: Now at end of input.
1186 Cleanup: discarding lookahead token $end ()
1187 Stack now 0 1 3
1188 Cleanup: popping token error ()
1189 Cleanup: popping token 'a' ('a')
1190 DESTROY 'a'
1191 ]])
1192
1193 AT_CLEANUP
1194
1195
1196
1197 ## ------------------------------------------------------ ##
1198 ## Default %printer and %destructor are not for $accept.  ##
1199 ## ------------------------------------------------------ ##
1200
1201 AT_SETUP([Default %printer and %destructor are not for $accept])
1202
1203 # If YYSTYPE is a union and Bison were to apply the default %printer and
1204 # %destructor to $accept:
1205 #   - The %printer and %destructor code generated for $accept would always be
1206 #     dead code because $accept is currently never shifted onto the stack.
1207 #   - $$ for $accept would always be of type YYSTYPE because it's not possible
1208 #     to declare `%type <field> $accept'.  (Also true for $undefined.)
1209 #   - Thus, the compiler might complain that the user code assumes the wrong
1210 #     type for $$ since the code might assume the type associated with a
1211 #     specific union field, which is especially reasonable in C++ since that
1212 #     type may be a base type.  This test case checks for this problem.  (Also
1213 #     true for $undefined and the error token, so there are three warnings for
1214 #     %printer and three for %destructor.)
1215
1216 AT_BISON_OPTION_PUSHDEFS
1217 AT_DATA_GRAMMAR([[input.y]],
1218 [[%debug /* So that %printer is actually compiled.  */
1219
1220 %{
1221 # include <stdio.h>
1222 # include <stdlib.h>
1223 ]AT_YYERROR_DECLARE[
1224 ]AT_YYLEX_DECLARE[
1225 # define USE(SYM)
1226 %}
1227
1228 %printer {
1229   char chr = $$;
1230   fprintf (yyoutput, "'%c'", chr);
1231 } <> <*>
1232 %destructor {
1233   char chr = $$;
1234   fprintf (stderr, "DESTROY '%c'\n", chr);
1235 } <> <*>
1236
1237 %union { char chr; }
1238 %type <chr> start
1239
1240 %%
1241
1242 start: { USE($$); } ;
1243
1244 %%
1245 ]AT_YYERROR_DEFINE[
1246 ]AT_YYLEX_DEFINE[
1247 ]AT_MAIN_DEFINE[
1248 ]])
1249 AT_BISON_OPTION_POPDEFS
1250
1251 AT_BISON_CHECK([-o input.c input.y], [], [],
1252 [[input.y:22.3-4: warning: useless %destructor for type <> [-Wother]
1253 input.y:22.3-4: warning: useless %printer for type <> [-Wother]
1254 ]])
1255 AT_COMPILE([input])
1256
1257 AT_CLEANUP
1258
1259
1260
1261 ## ------------------------------------------------------ ##
1262 ## Default %printer and %destructor for mid-rule values.  ##
1263 ## ------------------------------------------------------ ##
1264
1265 AT_SETUP([Default %printer and %destructor for mid-rule values])
1266
1267 AT_BISON_OPTION_PUSHDEFS
1268 AT_DATA_GRAMMAR([[input.y]],
1269 [[%debug /* So that %printer is actually compiled.  */
1270
1271 %{
1272 # include <stdio.h>
1273 # include <stdlib.h>
1274 ]AT_YYERROR_DECLARE[
1275 ]AT_YYLEX_DECLARE[
1276 # define USE(SYM)
1277 # define YYLTYPE int
1278 # define YYLLOC_DEFAULT(Current, Rhs, N) (void)(Rhs)
1279 # define YY_LOCATION_PRINT(File, Loc)
1280 %}
1281
1282 %printer { fprintf (yyoutput, "%d", @$); } <>
1283 %destructor { fprintf (stderr, "DESTROY %d\n", @$); } <>
1284 %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1285 %destructor { fprintf (yyoutput, "<*> destructor should not be called"); } <*>
1286
1287 %%
1288
1289 start:
1290   {           @$ = 1; } // Not set or used.
1291   { USE ($$); @$ = 2; } // Both set and used.
1292   { USE ($$); @$ = 3; } // Only set.
1293   {           @$ = 4; } // Only used.
1294   'c'
1295   { USE (($$, $2, $4, $5)); @$ = 0; }
1296   ;
1297
1298 %%
1299 ]AT_YYERROR_DEFINE[
1300 ]AT_YYLEX_DEFINE[
1301 int
1302 main (void)
1303 {
1304   yydebug = 1;
1305   return yyparse ();
1306 }
1307 ]])
1308 AT_BISON_OPTION_POPDEFS
1309
1310 AT_BISON_CHECK([-o input.c input.y], 0,,
1311 [[input.y:24.70-72: warning: useless %destructor for type <*> [-Wother]
1312 input.y:24.70-72: warning: useless %printer for type <*> [-Wother]
1313 input.y:33.3-23: warning: unset value: $$ [-Wother]
1314 input.y:32.3-23: warning: unused value: $3 [-Wother]
1315 ]])
1316
1317 AT_BISON_CHECK([-fcaret -o input.c input.y], 0,,
1318 [[input.y:24.70-72: warning: useless %destructor for type <*> [-Wother]
1319  %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1320                                                                       ^^^
1321 input.y:24.70-72: warning: useless %printer for type <*> [-Wother]
1322  %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
1323                                                                       ^^^
1324 input.y:33.3-23: warning: unset value: $$ [-Wother]
1325    {           @$ = 4; } // Only used.
1326    ^^^^^^^^^^^^^^^^^^^^^
1327 input.y:32.3-23: warning: unused value: $3 [-Wother]
1328    { USE ($$); @$ = 3; } // Only set.
1329    ^^^^^^^^^^^^^^^^^^^^^
1330 ]])
1331
1332 AT_COMPILE([input])
1333 AT_PARSER_CHECK([./input], 1,,
1334 [[Starting parse
1335 Entering state 0
1336 Reducing stack by rule 1 (line 30):
1337 -> $$ = nterm $@1 (: )
1338 Stack now 0
1339 Entering state 2
1340 Reducing stack by rule 2 (line 31):
1341 -> $$ = nterm @2 (: 2)
1342 Stack now 0 2
1343 Entering state 4
1344 Reducing stack by rule 3 (line 32):
1345 -> $$ = nterm @3 (: 3)
1346 Stack now 0 2 4
1347 Entering state 5
1348 Reducing stack by rule 4 (line 33):
1349 -> $$ = nterm @4 (: 4)
1350 Stack now 0 2 4 5
1351 Entering state 6
1352 Reading a token: Now at end of input.
1353 syntax error
1354 Error: popping nterm @4 (: 4)
1355 DESTROY 4
1356 Stack now 0 2 4 5
1357 Error: popping nterm @3 (: 3)
1358 DESTROY 3
1359 Stack now 0 2 4
1360 Error: popping nterm @2 (: 2)
1361 DESTROY 2
1362 Stack now 0 2
1363 Error: popping nterm $@1 (: )
1364 Stack now 0
1365 Cleanup: discarding lookahead token $end (: )
1366 Stack now 0
1367 ]])
1368
1369 AT_CLEANUP
1370
1371
1372 ## ----------------------- ##
1373 ## @$ implies %locations.  ##
1374 ## ----------------------- ##
1375
1376 # Bison once forgot to check for @$ in actions other than semantic actions.
1377
1378 # AT_CHECK_ACTION_LOCATIONS(ACTION-DIRECTIVE)
1379 # -------------------------------------------
1380 m4_define([AT_CHECK_ACTION_LOCATIONS],
1381 [AT_SETUP([[@$ in ]$1[ implies %locations]])
1382 AT_BISON_OPTION_PUSHDEFS
1383 AT_DATA_GRAMMAR([[input.y]],
1384 [[%code {
1385   #include <stdio.h>
1386 ]AT_YYERROR_DECLARE[
1387 ]AT_YYLEX_DECLARE[
1388 }
1389
1390 %debug
1391
1392 ]$1[ {
1393   fprintf (stderr, "%d\n", @$.first_line);
1394 } ]m4_if($1, [%initial-action], [], [[start]])[
1395
1396 %%
1397
1398 start:  ;
1399
1400 %%
1401
1402 static int
1403 yylex (void)
1404 {
1405   return 0;
1406 }
1407
1408 ]AT_YYERROR_DEFINE[
1409 ]AT_MAIN_DEFINE[
1410 ]])
1411
1412 AT_BISON_CHECK([[-o input.c input.y]])
1413 AT_COMPILE([[input]])
1414 AT_BISON_OPTION_POPDEFS
1415 AT_CLEANUP])
1416
1417 AT_CHECK_ACTION_LOCATIONS([[%initial-action]])
1418 AT_CHECK_ACTION_LOCATIONS([[%destructor]])
1419 AT_CHECK_ACTION_LOCATIONS([[%printer]])
1420
1421
1422 ## ------------------------- ##
1423 ## Qualified $$ in actions.  ##
1424 ## ------------------------- ##
1425
1426 # Check that we can use qualified $$ (v.g., $<type>$) not only in rule
1427 # actions, but also where $$ is valid: %destructor/%printer and
1428 # %initial-action.
1429 #
1430 # FIXME: Not actually checking %destructor, but it's the same code as
1431 # %printer...
1432 #
1433 # To do that, use a semantic value that has two fields (sem_type),
1434 # declare symbols to have only one of these types (INT, float), and
1435 # use $<type>$ to get the other one.  Including for symbols that are
1436 # not typed (UNTYPED).
1437
1438 m4_pushdef([AT_TEST],
1439 [AT_SETUP([[Qualified $$ in actions: $1]])
1440
1441 AT_BISON_OPTION_PUSHDEFS([%skeleton "$1"])
1442
1443 AT_DATA_GRAMMAR([[input.y]],
1444 [[%skeleton "$1"
1445 %debug
1446 %code requires
1447 {
1448   typedef struct sem_type
1449   {
1450     int ival;
1451     float fval;
1452   } sem_type;
1453
1454 # define YYSTYPE sem_type
1455
1456 ]AT_SKEL_CC_IF([[
1457 # include <iostream>
1458   static void
1459   report (std::ostream& yyo, int ival, float fval)
1460   {
1461     yyo << "ival: " << ival << ", fval: " <<  fval;
1462   }
1463 ]], [[
1464 # include <stdio.h>
1465   static void
1466   report (FILE* yyo, int ival, float fval)
1467   {
1468     fprintf (yyo, "ival: %d, fval: %1.1f", ival, fval);
1469   }
1470 ]])[
1471 }
1472
1473 %code
1474 {
1475   ]AT_YYERROR_DECLARE[
1476   ]AT_YYLEX_DECLARE[
1477 }
1478
1479 %token UNTYPED
1480 %token <ival> INT
1481 %type <fval> float
1482 %printer { report (yyo, $$,       $<fval>$); } <ival>;
1483 %printer { report (yyo, $<ival>$, $$      ); } <fval>;
1484 %printer { report (yyo, $<ival>$, $<fval>$); } <>;
1485
1486 %initial-action
1487 {
1488   $<ival>$ = 42;
1489   $<fval>$ = 4.2;
1490 }
1491
1492 %%
1493 float: UNTYPED INT
1494 {
1495   $$       = $<fval>1 + $<fval>2;
1496   $<ival>$ = $<ival>1 + $][2;
1497 };
1498 %%
1499 ]AT_YYERROR_DEFINE[
1500 ]AT_YYLEX_DEFINE(AT_SKEL_CC_IF([[{yy::parser::token::UNTYPED,
1501                                  yy::parser::token::INT,
1502                                   EOF}]],
1503                                [[{UNTYPED, INT, EOF}]]),
1504                  [AT_VAL.ival = toknum * 10; AT_VAL.fval = toknum / 10.0;])[
1505 int
1506 main (void)
1507 {]AT_SKEL_CC_IF([[
1508   yy::parser p;
1509   p.set_debug_level(1);
1510   return p.parse ();]], [[
1511   yydebug = 1;
1512   return yyparse ();]])[
1513 }
1514 ]])
1515
1516 AT_FULL_COMPILE([[input]])
1517 AT_PARSER_CHECK([./input], 0, [], [stderr])
1518 # Don't be too picky on the traces, GLR is not exactly the same.  Keep
1519 # only the lines from the printer.
1520 AT_CHECK([[sed -ne '/ival:/p' stderr]], 0,
1521 [[Reading a token: Next token is token UNTYPED (ival: 10, fval: 0.1)
1522 Shifting token UNTYPED (ival: 10, fval: 0.1)
1523 Reading a token: Next token is token INT (ival: 20, fval: 0.2)
1524 Shifting token INT (ival: 20, fval: 0.2)
1525    $][1 = token UNTYPED (ival: 10, fval: 0.1)
1526    $][2 = token INT (ival: 20, fval: 0.2)
1527 -> $$ = nterm float (ival: 30, fval: 0.3)
1528 Cleanup: popping nterm float (ival: 30, fval: 0.3)
1529 ]])
1530
1531 AT_BISON_OPTION_POPDEFS
1532
1533 AT_CLEANUP
1534 ])
1535
1536 AT_TEST([yacc.c])
1537 AT_TEST([glr.c])
1538 AT_TEST([lalr1.cc])
1539 AT_TEST([glr.cc])
1540
1541 m4_popdef([AT_TEST])
1542
1543 ## ----------------------------------------------- ##
1544 ## Fix user actions without a trailing semicolon.  ##
1545 ## ----------------------------------------------- ##
1546
1547 AT_SETUP([[Fix user actions without a trailing semicolon]])
1548
1549 # This feature is undocumented, but we accidentally broke it in 2.3a,
1550 # and there was a complaint at:
1551 # <http://lists.gnu.org/archive/html/bug-bison/2008-11/msg00001.html>.
1552 AT_BISON_OPTION_PUSHDEFS
1553 AT_DATA([input.y],
1554 [[%%
1555 start: test2 test1 test0 testc;
1556
1557 test2
1558 : 'a' { semi;                   /* TEST:N:2 */ }
1559 | 'b' { if (0) {no_semi}        /* TEST:N:2 */ }
1560 | 'c' { if (0) {semi;}          /* TEST:N:2 */ }
1561 | 'd' { semi;   no_semi         /* TEST:Y:2 */ }
1562 | 'e' { semi(); no_semi()       /* TEST:Y:2 */ }
1563 | 'f' { semi[]; no_semi[]       /* TEST:Y:2 */ }
1564 | 'g' { semi++; no_semi++       /* TEST:Y:2 */ }
1565 | 'h' { {no_semi} no_semi       /* TEST:Y:2 */ }
1566 | 'i' { {semi;}   no_semi       /* TEST:Y:2 */ }
1567 ;
1568 test1
1569   : 'a' { semi;                 // TEST:N:1 ;
1570 } | 'b' { if (0) {no_semi}      // TEST:N:1 ;
1571 } | 'c' { if (0) {semi;}        // TEST:N:1 ;
1572 } | 'd' { semi;   no_semi       // TEST:Y:1 ;
1573 } | 'e' { semi(); no_semi()     // TEST:Y:1 ;
1574 } | 'f' { semi[]; no_semi[]     // TEST:Y:1 ;
1575 } | 'g' { semi++; no_semi++     // TEST:Y:1 ;
1576 } | 'h' { {no_semi} no_semi     // TEST:Y:1 ;
1577 } | 'i' { {semi;}   no_semi     // TEST:Y:1 ;
1578 } ;
1579 test0
1580   : 'a' { semi;                 // TEST:N:1 {}
1581 } | 'b' { if (0) {no_semi}      // TEST:N:1 {}
1582 } | 'c' { if (0) {semi;}        // TEST:N:1 {}
1583 } | 'd' { semi;   no_semi       // TEST:Y:1 {}
1584 } | 'e' { semi(); no_semi()     // TEST:Y:1 {}
1585 } | 'f' { semi[]; no_semi[]     // TEST:Y:1 {}
1586 } | 'g' { semi++; no_semi++     // TEST:Y:1 {}
1587 } | 'h' { {no_semi} no_semi     // TEST:Y:1 {}
1588 } | 'i' { {semi;}   no_semi     // TEST:Y:1 {}
1589 } ;
1590
1591 testc
1592 : 'a' {
1593 #define TEST_MACRO_N \
1594 []"broken\" $ @ $$ @$ [];\
1595 string;"}
1596 | 'b' {
1597 no_semi
1598 #define TEST_MACRO_N \
1599 []"broken\" $ @ $$ @$ [];\
1600 string;"}
1601 ]])
1602 AT_BISON_OPTION_POPDEFS
1603
1604 AT_BISON_CHECK([[-o input.c input.y]], [0], [],
1605 [[input.y:8.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1606 input.y:8.48:     future versions of Bison will not add the ';'
1607 input.y:9.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1608 input.y:9.48:     future versions of Bison will not add the ';'
1609 input.y:10.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1610 input.y:10.48:     future versions of Bison will not add the ';'
1611 input.y:11.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1612 input.y:11.48:     future versions of Bison will not add the ';'
1613 input.y:12.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1614 input.y:12.48:     future versions of Bison will not add the ';'
1615 input.y:13.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1616 input.y:13.48:     future versions of Bison will not add the ';'
1617 input.y:20.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1618 input.y:20.1:     future versions of Bison will not add the ';'
1619 input.y:21.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1620 input.y:21.1:     future versions of Bison will not add the ';'
1621 input.y:22.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1622 input.y:22.1:     future versions of Bison will not add the ';'
1623 input.y:23.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1624 input.y:23.1:     future versions of Bison will not add the ';'
1625 input.y:24.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1626 input.y:24.1:     future versions of Bison will not add the ';'
1627 input.y:25.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1628 input.y:25.1:     future versions of Bison will not add the ';'
1629 input.y:31.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1630 input.y:31.1:     future versions of Bison will not add the ';'
1631 input.y:32.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1632 input.y:32.1:     future versions of Bison will not add the ';'
1633 input.y:33.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1634 input.y:33.1:     future versions of Bison will not add the ';'
1635 input.y:34.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1636 input.y:34.1:     future versions of Bison will not add the ';'
1637 input.y:35.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1638 input.y:35.1:     future versions of Bison will not add the ';'
1639 input.y:36.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
1640 input.y:36.1:     future versions of Bison will not add the ';'
1641 ]])
1642
1643 AT_MATCHES_CHECK([input.c], [[/\* TEST:N:2 \*/ \}$]],       [[3]])
1644 AT_MATCHES_CHECK([input.c], [[/\* TEST:Y:2 \*/ ;\}$]],      [[6]])
1645 AT_MATCHES_CHECK([input.c], [[// TEST:N:1 [;{}]*\n\}$]],    [[6]])
1646 AT_MATCHES_CHECK([input.c], [[// TEST:Y:1 [;{}]*\n;\}$]],  [[12]])
1647 AT_MATCHES_CHECK([input.c], [[#define TEST_MACRO_N \\\n\[\]"broken\\" \$ \@ \$\$ \@\$ \[\];\\\nstring;"\}]], [[2]])
1648
1649 AT_CLEANUP
1650
1651
1652 ## -------------------------------------------------- ##
1653 ## Destroying lookahead assigned by semantic action.  ##
1654 ## -------------------------------------------------- ##
1655
1656 AT_SETUP([[Destroying lookahead assigned by semantic action]])
1657
1658 AT_BISON_OPTION_PUSHDEFS
1659 AT_DATA_GRAMMAR([input.y],
1660 [[
1661 %code {
1662   #include <assert.h>
1663   #include <stdio.h>
1664 ]AT_YYERROR_DECLARE[
1665 ]AT_YYLEX_DECLARE[
1666   #define USE(Var)
1667 }
1668
1669 %destructor { fprintf (stderr, "'a' destructor\n"); } 'a'
1670 %destructor { fprintf (stderr, "'b' destructor\n"); } 'b'
1671
1672 %%
1673
1674 // In a previous version of Bison, yychar assigned by the semantic
1675 // action below was not translated into yytoken before the lookahead was
1676 // discarded and thus before its destructor (selected according to
1677 // yytoken) was called in order to return from yyparse.  This would
1678 // happen even if YYACCEPT was performed in a later semantic action as
1679 // long as only consistent states with default reductions were visited
1680 // in between.  However, we leave YYACCEPT in the same semantic action
1681 // for this test in order to show that skeletons cannot simply translate
1682 // immediately after every semantic action because a semantic action
1683 // that has set yychar might not always return normally.  Instead,
1684 // skeletons must translate before every use of yytoken.
1685 start: 'a' accept { USE($1); } ;
1686 accept: /*empty*/ {
1687   assert (yychar == YYEMPTY);
1688   yychar = 'b';
1689   YYACCEPT;
1690 } ;
1691
1692 %%
1693 ]AT_YYERROR_DEFINE[
1694 ]AT_YYLEX_DEFINE(["a"])[
1695 ]AT_MAIN_DEFINE[
1696 ]])
1697 AT_BISON_OPTION_POPDEFS
1698 AT_BISON_CHECK([[-o input.c input.y]])
1699 AT_COMPILE([[input]])
1700 AT_PARSER_CHECK([[./input]], [[0]], [],
1701 [['b' destructor
1702 'a' destructor
1703 ]])
1704
1705 AT_CLEANUP
1706
1707 ## ---------- ##
1708 ## YYBACKUP.  ##
1709 ## ---------- ##
1710
1711 AT_SETUP([[YYBACKUP]])
1712
1713 AT_BISON_OPTION_PUSHDEFS([%pure-parser])
1714
1715 AT_DATA_GRAMMAR([input.y],
1716 [[
1717 %error-verbose
1718 %debug
1719 %pure-parser
1720 %code {
1721 # include <stdio.h>
1722 # include <stdlib.h>
1723 # include <assert.h>
1724
1725   ]AT_YYERROR_DECLARE[
1726   ]AT_YYLEX_DECLARE[
1727 }
1728 %%
1729 input:
1730   exp exp {}
1731 ;
1732
1733 exp:
1734   'a'     { printf ("a: %d\n", $1); }
1735 | 'b'     { YYBACKUP('a', 123); }
1736 | 'c' 'd' { YYBACKUP('a', 456); }
1737 ;
1738
1739 %%
1740 ]AT_YYERROR_DEFINE[
1741 ]AT_YYLEX_DEFINE(["bcd"], [*lvalp = (toknum + 1) * 10])[
1742 ]AT_MAIN_DEFINE[
1743 ]])
1744 AT_BISON_OPTION_POPDEFS
1745
1746 AT_BISON_CHECK([[-o input.c input.y]])
1747 AT_COMPILE([[input]])
1748 AT_PARSER_CHECK([[./input]], [[0]],
1749 [[a: 123
1750 a: 456
1751 ]])
1752
1753 AT_CLEANUP