tests/c++.at

   1 # Checking the C++ Features.                    -*- Autotest -*-
   2
   3 # Copyright (C) 2004-2005, 2007-2013 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([[C++ Features.]])
  19
  20
  21 ## ---------- ##
  22 ## Variants.  ##
  23 ## ---------- ##
  24
  25 # AT_TEST([DIRECTIVES])
  26 # ---------------------
  27 # Check the support of variants in C++, with the additional DIRECTIVES.
  28 m4_pushdef([AT_TEST],
  29 [AT_SETUP([Variants $1])
  30
  31 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc" $1])
  32 # Store strings and integers in a list of strings.
  33 AT_DATA_GRAMMAR([list.yy],
  34 [[%debug
  35 %skeleton "lalr1.cc"
  36 %defines
  37 %define api.value.type variant
  38 ]m4_bpatsubst([$1], [\\n], [
  39 ])[
  40
  41 %code requires // code for the .hh file
  42 {
  43 #include <list>
  44 #include <string>
  45 typedef std::list<std::string> strings_type;
  46 }
  47
  48 %code // code for the .cc file
  49 {
  50 #include <cstdlib> // abort, getenv
  51 #include <iostream>
  52 #include <sstream>
  53
  54   namespace yy
  55   {
  56     static]AT_TOKEN_CTOR_IF([[
  57     parser::symbol_type yylex ()]], [[
  58     parser::token_type yylex (parser::semantic_type* yylval]AT_LOCATION_IF([,
  59                               parser::location_type* yylloc])[)]])[;
  60   }
  61
  62   // Printing a list of strings (for %printer).
  63   // Koening look up will look into std, since that's an std::list.
  64   namespace std
  65   {
  66     std::ostream&
  67     operator<<(std::ostream& o, const strings_type& s)
  68     {
  69       o << '(';
  70       for (strings_type::const_iterator i = s.begin (); i != s.end (); ++i)
  71         {
  72           if (i != s.begin ())
  73             o << ", ";
  74           o << *i;
  75         }
  76       return o << ')';
  77     }
  78   }
  79
  80   // Conversion to string.
  81   template <typename T>
  82     inline
  83     std::string
  84     string_cast (const T& t)
  85   {
  86     std::ostringstream o;
  87     o << t;
  88     return o.str ();
  89   }
  90 }
  91
  92 %token <::std::string> TEXT;
  93 %token <int> NUMBER;
  94 %token END_OF_FILE 0;
  95
  96 %type <::std::string> item;
  97 // Using the template type to exercize its parsing.
  98 // Starting with :: to ensure we don't output "<::" which starts by the
  99 // digraph for the left square bracket.
 100 %type <::std::list<std::string>> list result;
 101
 102 %printer { yyo << $][$; }
 103   <int> <::std::string> <::std::list<std::string>>;
 104 %%
 105
 106 result:
 107   list          { std::cout << $][1 << std::endl; }
 108 ;
 109
 110 list:
 111   /* nothing */ { /* Generates an empty string list */ }
 112 | list item     { std::swap ($][$,$][1); $$.push_back ($][2); }
 113 | list error    { std::swap ($][$,$][1); }
 114 ;
 115
 116 item:
 117   TEXT          { std::swap ($][$,$][1); }
 118 | NUMBER        { if ($][1 == 3) YYERROR; else $][$ = string_cast ($][1); }
 119 ;
 120 %%
 121
 122 #ifdef TWO_STAGE_BUILD
 123 # define BUILD(Type, Value) build<Type> () = Value
 124 #else
 125 # define BUILD(Type, Value) build (Value)
 126 #endif
 127
 128 #define STAGE_MAX 5
 129 namespace yy
 130 {
 131   static]AT_TOKEN_CTOR_IF([[
 132   parser::symbol_type yylex ()]], [[
 133   parser::token_type yylex (parser::semantic_type* yylval]AT_LOCATION_IF([,
 134                             parser::location_type* yylloc])[)]])[
 135   {]AT_LOCATION_IF([
 136     typedef parser::location_type location;])[
 137     static int stage = -1;
 138     ++stage;
 139     if (stage == STAGE_MAX)
 140       {]AT_TOKEN_CTOR_IF([[
 141         return parser::make_END_OF_FILE (]AT_LOCATION_IF([location ()])[);]],
 142 [AT_LOCATION_IF([
 143         *yylloc = location ();])[
 144         return parser::token::END_OF_FILE;]])[
 145       }
 146     else if (stage % 2)
 147       {]AT_TOKEN_CTOR_IF([[
 148         return parser::make_NUMBER (stage]AT_LOCATION_IF([, location ()])[);]],
 149 [[
 150         yylval->BUILD (int, stage);]AT_LOCATION_IF([
 151         *yylloc = location ();])[
 152         return parser::token::NUMBER;]])[
 153       }
 154     else
 155       {]AT_TOKEN_CTOR_IF([[
 156         return parser::make_TEXT (string_cast (stage)]AT_LOCATION_IF([, location ()])[);]], [[
 157         yylval->BUILD (std::string, string_cast (stage));]AT_LOCATION_IF([
 158         *yylloc = location ();])[
 159         return parser::token::TEXT;]])[
 160       }
 161     abort ();
 162   }
 163 }
 164
 165 ]AT_YYERROR_DEFINE[
 166 ]AT_MAIN_DEFINE[
 167 ]])
 168
 169 AT_BISON_CHECK([-o list.cc list.yy])
 170 AT_COMPILE_CXX([list], [$NO_STRICT_ALIAS_CXXFLAGS list.cc])
 171 AT_PARSER_CHECK([./list], 0,
 172 [(0, 1, 2, 4)
 173 ])
 174
 175 AT_BISON_OPTION_POPDEFS
 176 AT_CLEANUP
 177 ])
 178
 179 AT_TEST([])
 180 AT_TEST([%define parse.assert])
 181 AT_TEST([%locations %define parse.assert])
 182 AT_TEST([[%define parse.assert %code {\n#define TWO_STAGE_BUILD\n}]])
 183 AT_TEST([[%define parse.assert %define api.token.constructor]])
 184 AT_TEST([[%define parse.assert %define api.token.constructor %define api.token.prefix "TOK_"]])
 185 AT_TEST([[%locations %define parse.assert %define api.token.constructor %define api.token.prefix "TOK_"]])
 186
 187 m4_popdef([AT_TEST])
 188
 189
 190 ## ----------------------- ##
 191 ## Doxygen Documentation.  ##
 192 ## ----------------------- ##
 193
 194 m4_define([AT_CHECK_DOXYGEN],
 195 [m4_case([$1],
 196          [Public],  [m4_pushdef([AT_DOXYGEN_PRIVATE], [NO])],
 197          [Private], [m4_pushdef([AT_DOXYGEN_PRIVATE], [YES])],
 198          [m4_fatal([invalid argument: $1])])
 199 AT_SETUP([Doxygen $1 Documentation])
 200
 201 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 202 AT_DATA([input.yy],
 203 [[%skeleton "lalr1.cc"
 204 %locations
 205 %debug
 206 %defines
 207 %%
 208 exp: /* empty */;
 209 %%
 210 ]AT_YYERROR_DEFINE[
 211 ]])
 212
 213 AT_BISON_CHECK([-o input.cc input.yy], 0)
 214
 215 AT_DATA([Doxyfile],
 216 [# The PROJECT_NAME tag is a single word (or a sequence of words
 217 # surrounded by quotes) that should identify the project.
 218 PROJECT_NAME = "Bison C++ Parser"
 219
 220 # The QUIET tag can be used to turn on/off the messages that are
 221 # generated by doxygen. Possible values are YES and NO. If left blank
 222 # NO is used.
 223 QUIET = YES
 224
 225 # The WARNINGS tag can be used to turn on/off the warning messages
 226 # that are generated by doxygen. Possible values are YES and NO. If
 227 # left blank NO is used.
 228 WARNINGS     = YES
 229 # If WARN_IF_UNDOCUMENTED is set to YES, then doxygen will generate
 230 # warnings for undocumented members. If EXTRACT_ALL is set to YES then
 231 # this flag will automatically be disabled.
 232 WARN_IF_UNDOCUMENTED   = YES
 233 # If WARN_IF_DOC_ERROR is set to YES, doxygen will generate warnings
 234 # for potential errors in the documentation, such as not documenting
 235 # some parameters in a documented function, or documenting parameters
 236 # that don't exist or using markup commands wrongly.
 237 WARN_IF_DOC_ERROR      = YES
 238 # The WARN_FORMAT tag determines the format of the warning messages
 239 # that doxygen can produce. The string should contain the $file,
 240 # $line, and $text tags, which will be replaced by the file and line
 241 # number from which the warning originated and the warning text.
 242 WARN_FORMAT            = "$file:$line: $text"
 243
 244 # If the EXTRACT_ALL tag is set to YES doxygen will assume all
 245 # entities in documentation are documented, even if no documentation
 246 # was available.  Private class members and static file members will
 247 # be hidden unless the EXTRACT_PRIVATE and EXTRACT_STATIC tags are set
 248 # to YES
 249 EXTRACT_ALL            = YES
 250
 251 # If the EXTRACT_PRIVATE tag is set to YES all private members of a
 252 # class will be included in the documentation.
 253 EXTRACT_PRIVATE        = AT_DOXYGEN_PRIVATE
 254
 255 # If the EXTRACT_STATIC tag is set to YES all static members of a file
 256 # will be included in the documentation.
 257 EXTRACT_STATIC         = AT_DOXYGEN_PRIVATE
 258 ])
 259
 260 AT_CHECK([doxygen --version || exit 77], 0, ignore)
 261 AT_CHECK([doxygen], 0, [], [ignore])
 262
 263 AT_BISON_OPTION_POPDEFS
 264 AT_CLEANUP
 265
 266 m4_popdef([AT_DOXYGEN_PRIVATE])
 267 ])# AT_CHECK_DOXYGEN
 268
 269 AT_CHECK_DOXYGEN([Public])
 270 AT_CHECK_DOXYGEN([Private])
 271
 272
 273 ## ------------ ##
 274 ## Namespaces.  ##
 275 ## ------------ ##
 276
 277 # AT_TEST(NAMESPACE-DECL, [COMPILE-ERROR])
 278 # ----------------------------------------
 279 # See if Bison can handle %define namespace "NAMESPACE-DECL".  If COMPILE-ERROR
 280 # is specified, then Bison should accept the input, but compilation will fail,
 281 # so don't check compilation.
 282 m4_pushdef([AT_TEST],
 283 [AT_BISON_OPTION_PUSHDEFS([%language "C++" %define api.namespace "$1"])
 284 AT_DATA_GRAMMAR([[input.y]],
 285 [[%language "C++"
 286 %defines
 287 %define api.namespace "]$1["
 288 %union { int i; }
 289 %define global_tokens_and_yystype
 290 %locations
 291
 292 %code {
 293   // YYSTYPE contains a namespace reference.
 294   int yylex (YYSTYPE *lval, const ]$1[::parser::location_type*) {
 295     lval->i = 3;
 296     return 0;
 297   }
 298 }
 299
 300 %%
 301
 302 start: ;
 303
 304 %%
 305
 306 void
 307 ]$1[::parser::error (const ]$1[::parser::location_type &loc,
 308                      const std::string &msg)
 309 {
 310   std::cerr << "At " << loc << ": " << msg << std::endl;
 311 }
 312
 313 ]AT_MAIN_DEFINE[
 314 ]])
 315
 316 AT_BISON_CHECK([[-o input.cc input.y]])
 317
 318 m4_if([$#], [1],
 319 [AT_COMPILE_CXX([[input]], [[input.cc]])
 320 AT_PARSER_CHECK([[./input]])])
 321 AT_BISON_OPTION_POPDEFS
 322 ])
 323
 324 AT_SETUP([[Relative namespace references]])
 325 AT_TEST([[foo]])
 326 AT_TEST([[foo::bar]])
 327 AT_TEST([[foo::bar::baz]])
 328 AT_CLEANUP
 329
 330 AT_SETUP([[Absolute namespace references]])
 331 AT_TEST([[::foo]])
 332 AT_TEST([[::foo::bar]])
 333 AT_TEST([[::foo::bar::baz]])
 334 AT_TEST([[      ::foo]])
 335 AT_TEST([[       ::foo::bar]])
 336 AT_TEST([[  ::foo::bar::baz]])
 337 AT_CLEANUP
 338
 339 AT_SETUP([[Syntactically invalid namespace references]])
 340 AT_TEST([[:foo:bar]], [[-]])
 341 AT_TEST([[foo: :bar]], [[-]])
 342 # This one is interesting because `[3]' is encoded as `@<:@3@:>@', which
 343 # contains single occurrences of `:'.
 344 AT_TEST([[foo[3]::bar::baz]], [[-]])
 345 AT_TEST([[foo::bar,baz]], [[-]])
 346 AT_TEST([[foo::bar::(baz /* Pacify Emacs ) */]], [[-]])
 347 AT_CLEANUP
 348
 349 m4_popdef([AT_TEST])
 350
 351 ## -------------------------------------- ##
 352 ## Syntax error discarding no lookahead.  ##
 353 ## -------------------------------------- ##
 354
 355 # After a syntax error, lalr1.cc used to not check whether there
 356 # actually is a lookahead before discarding the lookahead.  As a result,
 357 # it mistakenly invoked the destructor for the previous lookahead.
 358
 359 AT_SETUP([[Syntax error discarding no lookahead]])
 360
 361 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 362
 363 AT_DATA_GRAMMAR([[input.yy]],
 364 [[%skeleton "lalr1.cc"
 365
 366 %code {
 367   #include <string>
 368   int yylex (yy::parser::semantic_type *);
 369   #define USE(Args)
 370 }
 371
 372 %defines
 373 %define parse.error verbose
 374
 375 %nonassoc 'a' ;
 376
 377 %destructor {
 378   std::cerr << "Discarding 'a'." << std::endl;
 379 } 'a'
 380
 381 %%
 382
 383 start: error-reduce consistent-error 'a' { USE ($3); };
 384
 385 error-reduce:
 386   'a' 'a' consistent-error 'a' { USE (($1, $2, $4)); }
 387 | 'a' error { std::cerr << "Reducing 'a'." << std::endl; USE ($1); }
 388 ;
 389
 390 consistent-error:
 391   'a'
 392 | /*empty*/ %prec 'a'
 393 ;
 394
 395 // Provide another context in which all rules are useful so that this
 396 // test case looks a little more realistic.
 397 start: 'b' consistent-error ;
 398
 399 %%
 400
 401 int
 402 yylex (yy::parser::semantic_type *)
 403 {
 404   static char const *input = "aa";
 405   return *input++;
 406 }
 407
 408 void
 409 yy::parser::error (const std::string &m)
 410 {
 411   std::cerr << m << std::endl;
 412 }
 413
 414 ]AT_MAIN_DEFINE[
 415 ]])
 416
 417 AT_BISON_CHECK([[-o input.cc input.yy]])
 418 AT_COMPILE_CXX([[input]])
 419 # This used to print "Discarding 'a'." again at the end.
 420 AT_PARSER_CHECK([[./input]], [[1]], [[]],
 421 [[syntax error
 422 Discarding 'a'.
 423 Reducing 'a'.
 424 ]])
 425
 426 AT_BISON_OPTION_POPDEFS
 427 AT_CLEANUP
 428
 429
 430 ## --------------------------- ##
 431 ## Syntax error as exception.  ##
 432 ## --------------------------- ##
 433
 434 AT_SETUP([[Syntax error as exception]])
 435
 436 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 437
 438 AT_DATA_GRAMMAR([[input.yy]],
 439 [[%skeleton "lalr1.cc"
 440
 441 %code
 442 {
 443   #include <cstdlib>
 444   int yylex (yy::parser::semantic_type *);
 445 }
 446
 447 %defines
 448 %define api.value.type variant
 449 %define parse.error verbose
 450 %define parse.trace
 451 %%
 452
 453 start:
 454   thing
 455 | start thing
 456 ;
 457
 458 thing:
 459   error   { std::cerr << "caught error" << std::endl; }
 460 | item
 461 ;
 462
 463 item:
 464   'a'
 465 | 's'
 466   {
 467     throw yy::parser::syntax_error ("invalid expression");
 468   }
 469
 470 %%
 471
 472 int
 473 yylex (yy::parser::semantic_type *)
 474 {
 475   // 's': syntax error, 'l': lexical error.
 476   static char const *input = "asal";
 477   switch (int res = *input++)
 478   {
 479     case 'l':
 480       throw yy::parser::syntax_error ("invalid character");
 481     default:
 482       return res;
 483   }
 484 }
 485
 486 void
 487 yy::parser::error (const std::string &m)
 488 {
 489   std::cerr << "error: " << m << std::endl;
 490 }
 491 ]AT_MAIN_DEFINE[
 492 ]])
 493
 494 AT_BISON_CHECK([[-o input.cc input.yy]])
 495 AT_COMPILE_CXX([[input]])
 496
 497 AT_PARSER_CHECK([[./input]], [[0]], [[]],
 498 [[error: invalid expression
 499 caught error
 500 error: invalid character
 501 caught error
 502 ]])
 503
 504 AT_BISON_OPTION_POPDEFS
 505 AT_CLEANUP
 506
 507
 508 ## ------------------ ##
 509 ## Exception safety.  ##
 510 ## ------------------ ##
 511
 512 AT_SETUP([[Exception safety]])
 513
 514 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 515
 516 AT_DATA_GRAMMAR([[input.yy]],
 517 [[%skeleton "lalr1.cc"
 518 %defines // FIXME: Mandated in 2.6.
 519 %debug
 520 %error-verbose
 521
 522 %code requires
 523 {
 524   #include <cassert>
 525   #include <cstdlib> // size_t and getenv.
 526   #include <iostream>
 527   #include <list>
 528
 529   bool debug = false;
 530
 531   /// A class that counts its number of instances.
 532   struct Object
 533   {
 534     typedef std::list<const Object*> objects;
 535     static objects instances;
 536     char val;
 537
 538     static bool
 539     empty ()
 540     {
 541       return instances.empty();
 542     }
 543
 544     static void
 545     log (Object const *o, const std::string& msg)
 546     {
 547       if (debug)
 548         {
 549           if (o)
 550             std::cerr << o << "->";
 551           std::cerr << msg << " {";
 552           const char* sep = " ";
 553           for (objects::const_iterator i = instances.begin(),
 554                                        i_end = instances.end();
 555                i != i_end;
 556                ++i)
 557             {
 558               std::cerr << sep << *i;
 559               sep = ", ";
 560             }
 561           std::cerr << " }" << std::endl;
 562         }
 563     }
 564
 565     Object (char v)
 566       : val (v)
 567     {
 568       instances.push_back(this);
 569       log (this, "Object::Object");
 570     }
 571
 572     ~Object ()
 573     {
 574       instances.remove(this);
 575       log (this, "Object::~Object");
 576     }
 577   };
 578 }
 579
 580 %code
 581 {
 582   #include <cassert>
 583   #include <cstring> // strchr
 584   #include <stdexcept>
 585   int yylex (yy::parser::semantic_type *);
 586   Object::objects Object::instances;
 587   static char const *input;
 588 }
 589
 590 %union
 591 {
 592   Object *obj;
 593 }
 594
 595 %initial-action
 596 {
 597   if (strchr (input, 'i'))
 598     throw std::runtime_error ("initial-action");
 599 }
 600
 601 %destructor { delete $$; } <obj>;
 602 %printer
 603 {
 604   yyo << $$ << " '" << $$->val << '\'';
 605   if ($$->val == 'p')
 606     throw std::runtime_error ("printer");
 607 } <obj>;
 608
 609 %token <obj> 'a' 'E' 'e' 'p' 'R' 's' 'T'
 610 %type  <obj> list item
 611
 612 %%
 613
 614 start: list { delete $1; };
 615
 616 list:
 617   item       { $$ = $1; }
 618 | item list  { $$ = $1; delete $2; } // Right recursion to load the stack.
 619 ;
 620
 621 item:
 622   'a'  { $$ = $1; }
 623 | 'e'  { YYUSE ($$); YYUSE($1); error ("syntax error"); }
 624 // Not just 'E', otherwise we reduce when 'E' is the lookahead, and
 625 // then the stack is emptied, defeating the point of the test.
 626 | 'E' 'a' { YYUSE($1); $$ = $2; }
 627 | 'R'  { $$ = YY_NULL; delete $1; YYERROR; }
 628 | 'p'  { $$ = $1; }
 629 | 's'  { $$ = $1; throw std::runtime_error ("reduction"); }
 630 | 'T'  { $$ = YY_NULL; delete $1; YYABORT; }
 631 | error { $$ = YY_NULL; yyerrok; }
 632 ;
 633 %%
 634
 635 int
 636 yylex (yy::parser::semantic_type *lvalp)
 637 {
 638   // 'a': no error.
 639   // 'e': user action calls error.
 640   // 'E': syntax error, with yyerror that throws.
 641   // 'i': initial action throws.
 642   // 'l': yylex throws.
 643   // 'R': call YYERROR in the action
 644   // 's': reduction throws.
 645   // 'T': call YYABORT in the action
 646   switch (int res = *input++)
 647   {
 648     case 'l':
 649       throw std::runtime_error ("yylex");
 650     default:
 651       lvalp->obj = new Object (res);
 652       // Fall through.
 653     case 0:
 654       return res;
 655   }
 656 }
 657
 658 /* A C++ error reporting function.  */
 659 void
 660 yy::parser::error (const std::string& m)
 661 {
 662   throw std::runtime_error (m);
 663 }
 664
 665 int
 666 main (int argc, const char *argv[])
 667 {
 668   switch (argc)
 669   {
 670     case 2:
 671       input = argv[1];
 672       break;
 673     case 3:
 674       assert (std::string(argv[1]) == "--debug");
 675       debug = 1;
 676       input = argv[2];
 677       break;
 678     default:
 679       abort ();
 680   }
 681
 682   yy::parser parser;
 683   debug |= !!getenv ("YYDEBUG");
 684   parser.set_debug_level (debug);
 685   int res = 2;
 686   try
 687   {
 688     res = parser.parse ();
 689   }
 690   catch (const std::exception& e)
 691   {
 692     std::cerr << "exception caught: " << e.what () << std::endl;
 693   }
 694   catch (...)
 695   {
 696     std::cerr << "unknown exception caught" << std::endl;
 697   }
 698   Object::log (YY_NULL, "end");
 699   assert (Object::empty());
 700   return res;
 701 }
 702 ]])
 703 AT_BISON_CHECK([[-o input.cc --report=all input.yy]])
 704 AT_COMPILE_CXX([[input]])
 705
 706 AT_PARSER_CHECK([[./input aaaas]], [[2]], [[]],
 707 [[exception caught: reduction
 708 ]])
 709
 710 AT_PARSER_CHECK([[./input aaaal]], [[2]], [[]],
 711 [[exception caught: yylex
 712 ]])
 713
 714 AT_PARSER_CHECK([[./input i]], [[2]], [[]],
 715 [[exception caught: initial-action
 716 ]])
 717
 718 AT_PARSER_CHECK([[./input aaaap]])
 719
 720 AT_PARSER_CHECK([[./input --debug aaaap]], [[2]], [[]], [[stderr]])
 721 AT_CHECK([[grep '^exception caught: printer$' stderr]], [], [ignore])
 722
 723 AT_PARSER_CHECK([[./input aaaae]], [[2]], [[]],
 724 [[exception caught: syntax error
 725 ]])
 726
 727 AT_PARSER_CHECK([[./input aaaaE]], [[2]], [[]],
 728 [[exception caught: syntax error, unexpected $end, expecting 'a'
 729 ]])
 730
 731 AT_PARSER_CHECK([[./input aaaaT]], [[1]])
 732
 733 # There is error-recovery, so exit success.
 734 AT_PARSER_CHECK([[./input aaaaR]], [[0]])
 735
 736 AT_BISON_OPTION_POPDEFS
 737
 738 AT_CLEANUP
 739
 740 ## ------------------------------------ ##
 741 ## C++ GLR parser identifier shadowing  ##
 742 ## ------------------------------------ ##
 743
 744 AT_SETUP([[C++ GLR parser identifier shadowing]])
 745
 746 AT_DATA_GRAMMAR([input.yy], [
 747 %skeleton "glr.cc"
 748
 749 %union
 750 {
 751   int ival;
 752 }
 753
 754 %token <ival> ZERO;
 755
 756 %code
 757 {
 758   int yylex (yy::parser::semantic_type *yylval);
 759 }
 760
 761 %%
 762 exp: ZERO
 763
 764 %%
 765
 766 int yylex (yy::parser::semantic_type *yylval)
 767 {
 768   // Note: this argument is unused, but named on purpose.  There used to be a
 769   // bug with a macro that erroneously expanded this identifier to
 770   // yystackp->yyval.
 771   YYUSE (yylval);
 772   return yy::parser::token::ZERO;
 773 }
 774
 775 void yy::parser::error (std::string const&)
 776 {}
 777
 778 int main()
 779 {}
 780 ])
 781
 782 AT_BISON_CHECK([[-o input.cc input.yy]])
 783 AT_COMPILE_CXX([[input]])
 784
 785 AT_CLEANUP