tests/c++.at

   1 # Checking the C++ Features.                    -*- Autotest -*-
   2
   3 # Copyright (C) 2004-2005, 2007-2015 Free Software Foundation, Inc.
   4
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 AT_BANNER([[C++ Features.]])
  19
  20
  21 ## --------------- ##
  22 ## C++ Locations.  ##
  23 ## --------------- ##
  24
  25 AT_SETUP([C++ Locations])
  26
  27 AT_BISON_OPTION_PUSHDEFS([%locations %skeleton "lalr1.cc"])
  28 AT_DATA_GRAMMAR([[input.y]],
  29 [[%code {#include <sstream>}
  30 %locations
  31 %debug
  32 %skeleton "lalr1.cc"
  33 %code
  34 {
  35 ]AT_YYERROR_DECLARE[
  36 ]AT_YYLEX_DECLARE[
  37 }
  38 %%
  39 exp: %empty;
  40 %%
  41 ]AT_YYERROR_DEFINE[
  42 ]AT_YYLEX_DEFINE[
  43
  44 template <typename T>
  45 bool
  46 check (const T& in, const std::string& s)
  47 {
  48   std::stringstream os;
  49   os << in;
  50   if (os.str () != s)
  51     {
  52       std::cerr << "fail: " << os.str () << ", expected: " << s << std::endl;
  53       return false;
  54     }
  55   return true;
  56 }
  57
  58 int
  59 main (void)
  60 {
  61   int fail = 0;
  62   ]AT_YYLTYPE[ loc;  fail += check (loc, "1.1");
  63                      fail += check (loc + 10, "1.1-10");
  64   loc += 10;         fail += check (loc, "1.1-10");
  65   loc += -5;         fail += check (loc, "1.1-5");
  66                      fail += check (loc - 5, "1.1");
  67   loc -= 5;          fail += check (loc, "1.1");
  68   // Check that we don't go below.
  69   // http://lists.gnu.org/archive/html/bug-bison/2013-02/msg00000.html
  70   loc -= 10;         fail += check (loc, "1.1");
  71
  72   loc.columns (10); loc.lines (10); fail += check (loc, "1.1-11.0");
  73   loc.lines (-2);                   fail += check (loc, "1.1-9.0");
  74   loc.lines (-10);                  fail += check (loc, "1.1");
  75
  76   ]AT_YYLTYPE[ loc2 (YY_NULLPTR, 5, 10);
  77                    fail += check (loc2, "5.10");
  78                    fail += check (loc + loc2, "1.1-5.9");
  79   loc += loc2;     fail += check (loc, "1.1-5.9");
  80   return !fail;
  81 }
  82 ]])
  83
  84 AT_FULL_COMPILE([input])
  85 AT_PARSER_CHECK([./input], 0)
  86 AT_BISON_OPTION_POPDEFS
  87 AT_CLEANUP
  88
  89
  90 ## --------------------------- ##
  91 ## C++ Variant-based Symbols.  ##
  92 ## --------------------------- ##
  93
  94 AT_SETUP([C++ Variant-based Symbols])
  95
  96 AT_KEYWORDS([variant])
  97
  98 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc" %debug $1])
  99 # Store strings and integers in a list of strings.
 100 AT_DATA_GRAMMAR([list.y],
 101 [[%skeleton "lalr1.cc"
 102 %define api.value.type variant
 103 %define parse.assert
 104 %debug
 105
 106 %code top
 107 {
 108   // Get access to stack_symbol_type for the tests.
 109 # define private public
 110 }
 111 %code provides
 112 {
 113   ]AT_YYLEX_DECLARE[
 114 }
 115
 116 %token <int> INT "int"
 117 %type < std::list<int> > exp
 118
 119 %printer { yyo << $$; } <int>
 120 %printer
 121   {
 122     for (std::list<int>::const_iterator i = $$.begin (); i != $$.end (); ++i)
 123       {
 124         if (i != $$.begin ())
 125           yyo << ", ";
 126         yyo << *i;
 127       }
 128   } < std::list<int> >
 129
 130 %code requires { #include <list> }
 131 %code { int yylex (yy::parser::semantic_type* yylval); }
 132
 133 %%
 134 exp: "int" { $$.push_back ($1); }
 135 %%
 136 ]AT_YYERROR_DEFINE[
 137 ]AT_YYLEX_DEFINE[
 138
 139 int main()
 140 {
 141   {
 142     yy::parser::symbol_type s = yy::parser::make_INT(12);
 143     std::cerr << s.value.as<int>() << std::endl;
 144   }
 145
 146   {
 147     yy::parser::symbol_type s = yy::parser::make_INT(123);
 148     yy::parser::stack_symbol_type ss(1, s);
 149     std::cerr << ss.value.as<int>() << std::endl;
 150   }
 151
 152   {
 153     yy::parser::stack_type st;
 154     for (int i = 0; i < 100; ++i)
 155       {
 156         yy::parser::symbol_type s(yy::parser::make_INT(i));
 157         yy::parser::stack_symbol_type ss(1, s);
 158         st.push(ss);
 159       }
 160   }
 161 }
 162 ]])
 163
 164 AT_FULL_COMPILE([list])
 165 AT_PARSER_CHECK([./list], 0, [],
 166 [12
 167 123
 168 ])
 169
 170 AT_BISON_OPTION_POPDEFS
 171 AT_CLEANUP
 172
 173
 174 ## ---------- ##
 175 ## Variants.  ##
 176 ## ---------- ##
 177
 178 # Check that the variants are properly supported, including in error
 179 # recovery.
 180
 181 # AT_TEST([DIRECTIVES])
 182 # ---------------------
 183 # Check the support of variants in C++, with the additional DIRECTIVES.
 184 m4_pushdef([AT_TEST],
 185 [AT_SETUP([Variants $1])
 186
 187 AT_BISON_OPTION_PUSHDEFS([%debug $1])
 188 # Store strings and integers in a list of strings.
 189 AT_DATA_GRAMMAR([list.y],
 190 [[%debug
 191 %define api.value.type variant
 192 ]m4_bpatsubst([$1], [\\n], [
 193 ])[
 194
 195 %code requires // code for the .hh file
 196 {
 197 #include <list>
 198 #include <string>
 199 typedef std::list<std::string> strings_type;
 200 }
 201
 202 %code // code for the .cc file
 203 {
 204 #include <cstdlib> // abort, getenv
 205 #include <iostream>
 206 #include <sstream>
 207
 208   namespace yy
 209   {
 210     static]AT_TOKEN_CTOR_IF([[
 211     parser::symbol_type yylex ()]], [[
 212     parser::token_type yylex (parser::semantic_type* yylval]AT_LOCATION_IF([,
 213                               parser::location_type* yylloc])[)]])[;
 214   }
 215
 216   // Printing a list of strings (for %printer).
 217   // Koening look up will look into std, since that's an std::list.
 218   namespace std
 219   {
 220     std::ostream&
 221     operator<<(std::ostream& o, const strings_type& s)
 222     {
 223       o << '(';
 224       for (strings_type::const_iterator i = s.begin (); i != s.end (); ++i)
 225         {
 226           if (i != s.begin ())
 227             o << ", ";
 228           o << *i;
 229         }
 230       return o << ')';
 231     }
 232   }
 233
 234   // Conversion to string.
 235   template <typename T>
 236     inline
 237     std::string
 238     to_string (const T& t)
 239   {
 240     std::ostringstream o;
 241     o << t;
 242     return o.str ();
 243   }
 244 }
 245
 246 %token <::std::string> TEXT;
 247 %token <int> NUMBER;
 248 %token END_OF_FILE 0;
 249 %token COMMA ","
 250
 251 %type <::std::string> item;
 252 // Using the template type to exercize its parsing.
 253 // Starting with :: to ensure we don't output "<::" which starts by the
 254 // digraph for the left square bracket.
 255 %type <::std::list<std::string>> list result;
 256
 257 %printer { yyo << $$; }
 258   <int> <::std::string> <::std::list<std::string>>;
 259 %%
 260
 261 result:
 262   list          { std::cout << $][1 << std::endl; }
 263 ;
 264
 265 list:
 266   item          { $$.push_back ($][1); }
 267 | list "," item { std::swap ($$, $][1); $$.push_back ($][3); }
 268 | list error    { std::swap ($$, $][1); }
 269 ;
 270
 271 item:
 272   TEXT          { std::swap ($$, $][1); }
 273 | NUMBER        { if ($][1 == 3) YYERROR; else $$ = to_string ($][1); }
 274 ;
 275 %%
 276 ]AT_TOKEN_CTOR_IF([],
 277 [[#ifdef TWO_STAGE_BUILD
 278 # define BUILD(Type, Value) build<Type> () = Value
 279 #else
 280 # define BUILD(Type, Value) build (Value)
 281 #endif
 282 ]])[
 283 #define STAGE_MAX 5
 284 namespace yy
 285 {
 286   static]AT_TOKEN_CTOR_IF([[
 287   parser::symbol_type yylex ()]], [[
 288   parser::token_type yylex (parser::semantic_type* yylval]AT_LOCATION_IF([,
 289                             parser::location_type* yylloc])[)]])[
 290   {]AT_LOCATION_IF([
 291     typedef parser::location_type location;])[
 292     // The 5 is a syntax error whose recovery requires that we discard
 293     // the lookahead.  This tests a regression, see
 294     // <http://savannah.gnu.org/support/?108481>.
 295     static char const *input = "0,1,2,3,45,6";
 296     switch (int stage = *input++)
 297     {
 298       case 0:]AT_TOKEN_CTOR_IF([[
 299         return parser::make_END_OF_FILE (]AT_LOCATION_IF([location ()])[);]],
 300 [AT_LOCATION_IF([
 301         *yylloc = location ();])[
 302         return parser::token::END_OF_FILE;]])[
 303
 304       case ',':
 305         ]AT_TOKEN_CTOR_IF([[
 306         return parser::make_COMMA (]AT_LOCATION_IF([location ()])[);]], [[
 307 ]AT_LOCATION_IF([
 308         *yylloc = location ();])[
 309         return parser::token::COMMA;]])[
 310
 311       default:
 312         stage = stage - '0';
 313         if (stage % 2)
 314          {]AT_TOKEN_CTOR_IF([[
 315            return parser::make_NUMBER (stage]AT_LOCATION_IF([, location ()])[);]], [[
 316            yylval->BUILD (int, stage);]AT_LOCATION_IF([
 317            *yylloc = location ();])[
 318            return parser::token::NUMBER;]])[
 319          }
 320        else
 321          {]AT_TOKEN_CTOR_IF([[
 322            return parser::make_TEXT (to_string (stage)]AT_LOCATION_IF([, location ()])[);]], [[
 323            yylval->BUILD (std::string, to_string (stage));]AT_LOCATION_IF([
 324            *yylloc = location ();])[
 325            return parser::token::TEXT;]])[
 326          }
 327     }
 328
 329     abort ();
 330   }
 331 }
 332
 333 ]AT_YYERROR_DEFINE[
 334 ]AT_MAIN_DEFINE[
 335 ]])
 336
 337 AT_FULL_COMPILE([list])
 338 AT_PARSER_CHECK([./list], 0,
 339 [(0, 1, 2, 4, 6)
 340 ])
 341
 342 AT_BISON_OPTION_POPDEFS
 343 AT_CLEANUP
 344 ])
 345
 346 AT_TEST([[%skeleton "lalr1.cc" ]])
 347 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert]])
 348 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert %locations]])
 349 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert %code {\n#define TWO_STAGE_BUILD\n}]])
 350 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert %define api.token.constructor]])
 351 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert %define api.token.constructor %define api.token.prefix {TOK_}]])
 352 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert %define api.token.constructor %define api.token.prefix {TOK_} %locations]])
 353
 354 m4_popdef([AT_TEST])
 355
 356
 357 ## ----------------------- ##
 358 ## Doxygen Documentation.  ##
 359 ## ----------------------- ##
 360
 361 m4_define([AT_CHECK_DOXYGEN],
 362 [m4_case([$1],
 363          [Public],  [m4_pushdef([AT_DOXYGEN_PRIVATE], [NO])],
 364          [Private], [m4_pushdef([AT_DOXYGEN_PRIVATE], [YES])],
 365          [m4_fatal([invalid argument: $1])])
 366 AT_SETUP([Doxygen $1 Documentation])
 367
 368 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 369 AT_DATA([input.yy],
 370 [[%skeleton "lalr1.cc"
 371 %locations
 372 %defines
 373 %debug
 374 %%
 375 exp: /* empty */;
 376 %%
 377 ]AT_YYERROR_DEFINE[
 378 ]])
 379
 380 AT_BISON_CHECK([-o input.cc input.yy])
 381
 382 AT_DATA([Doxyfile],
 383 [# The PROJECT_NAME tag is a single word (or a sequence of words
 384 # surrounded by quotes) that should identify the project.
 385 PROJECT_NAME = "Bison C++ Parser"
 386
 387 # The QUIET tag can be used to turn on/off the messages that are
 388 # generated by doxygen. Possible values are YES and NO. If left blank
 389 # NO is used.
 390 QUIET = YES
 391
 392 # The WARNINGS tag can be used to turn on/off the warning messages
 393 # that are generated by doxygen. Possible values are YES and NO. If
 394 # left blank NO is used.
 395 WARNINGS     = YES
 396 # If WARN_IF_UNDOCUMENTED is set to YES, then doxygen will generate
 397 # warnings for undocumented members. If EXTRACT_ALL is set to YES then
 398 # this flag will automatically be disabled.
 399 WARN_IF_UNDOCUMENTED   = YES
 400 # If WARN_IF_DOC_ERROR is set to YES, doxygen will generate warnings
 401 # for potential errors in the documentation, such as not documenting
 402 # some parameters in a documented function, or documenting parameters
 403 # that don't exist or using markup commands wrongly.
 404 WARN_IF_DOC_ERROR      = YES
 405 # The WARN_FORMAT tag determines the format of the warning messages
 406 # that doxygen can produce. The string should contain the $file,
 407 # $line, and $text tags, which will be replaced by the file and line
 408 # number from which the warning originated and the warning text.
 409 WARN_FORMAT            = "$file:$line: $text"
 410
 411 # If the EXTRACT_ALL tag is set to YES doxygen will assume all
 412 # entities in documentation are documented, even if no documentation
 413 # was available.  Private class members and static file members will
 414 # be hidden unless the EXTRACT_PRIVATE and EXTRACT_STATIC tags are set
 415 # to YES
 416 EXTRACT_ALL            = YES
 417
 418 # If the EXTRACT_PRIVATE tag is set to YES all private members of a
 419 # class will be included in the documentation.
 420 EXTRACT_PRIVATE        = AT_DOXYGEN_PRIVATE
 421
 422 # If the EXTRACT_STATIC tag is set to YES all static members of a file
 423 # will be included in the documentation.
 424 EXTRACT_STATIC         = AT_DOXYGEN_PRIVATE
 425 ])
 426
 427 AT_CHECK([doxygen --version || exit 77], 0, ignore)
 428 AT_CHECK([doxygen], 0, [], [ignore])
 429
 430 AT_BISON_OPTION_POPDEFS
 431 AT_CLEANUP
 432
 433 m4_popdef([AT_DOXYGEN_PRIVATE])
 434 ])# AT_CHECK_DOXYGEN
 435
 436 AT_CHECK_DOXYGEN([Public])
 437 AT_CHECK_DOXYGEN([Private])
 438
 439
 440 ## ------------ ##
 441 ## Namespaces.  ##
 442 ## ------------ ##
 443
 444 # AT_TEST(NAMESPACE-DECL, [COMPILE-ERROR])
 445 # ----------------------------------------
 446 # See if Bison can handle %define namespace "NAMESPACE-DECL".  If COMPILE-ERROR
 447 # is specified, then Bison should accept the input, but compilation will fail,
 448 # so don't check compilation.
 449 m4_pushdef([AT_TEST],
 450 [AT_BISON_OPTION_PUSHDEFS([%language "C++" %define api.namespace {$1}])
 451 AT_DATA_GRAMMAR([[input.yy]],
 452 [[%language "C++"
 453 %define api.namespace {]$1[}
 454 %union { int i; }
 455 %define global_tokens_and_yystype
 456 %locations
 457
 458 %code {
 459   // YYSTYPE contains a namespace reference.
 460   int yylex (YYSTYPE *lval, const ]$1[::parser::location_type*) {
 461     lval->i = 3;
 462     return 0;
 463   }
 464 }
 465
 466 %%
 467
 468 start: ;
 469
 470 %%
 471
 472 void
 473 ]$1[::parser::error (const ]$1[::parser::location_type &loc,
 474                      const std::string &msg)
 475 {
 476   std::cerr << "At " << loc << ": " << msg << std::endl;
 477 }
 478
 479 ]AT_MAIN_DEFINE[
 480 ]])
 481
 482
 483 AT_BISON_CHECK([[-o input.cc input.yy]])
 484
 485 m4_if([$#], [1],
 486 [AT_COMPILE_CXX([[input]])
 487 AT_PARSER_CHECK([[./input]])])
 488 AT_BISON_OPTION_POPDEFS
 489 ])
 490
 491 AT_SETUP([[Relative namespace references]])
 492 AT_TEST([[foo]])
 493 AT_TEST([[foo::bar]])
 494 AT_TEST([[foo::bar::baz]])
 495 AT_CLEANUP
 496
 497 AT_SETUP([[Absolute namespace references]])
 498 AT_TEST([[::foo]])
 499 AT_TEST([[::foo::bar]])
 500 AT_TEST([[::foo::bar::baz]])
 501 AT_TEST([[@tb@::foo]])
 502 AT_TEST([[  @tb@ ::foo::bar]])
 503 AT_TEST([[  ::foo::bar::baz]])
 504 AT_CLEANUP
 505
 506 AT_SETUP([[Syntactically invalid namespace references]])
 507 AT_TEST([[:foo:bar]], [[-]])
 508 AT_TEST([[foo: :bar]], [[-]])
 509 # This one is interesting because '[3]' is encoded as '@<:@3@:>@', which
 510 # contains single occurrences of ':'.
 511 AT_TEST([[foo[3]::bar::baz]], [[-]])
 512 AT_TEST([[foo::bar,baz]], [[-]])
 513 AT_TEST([[foo::bar::(baz /* Pacify Emacs ) */]], [[-]])
 514 AT_CLEANUP
 515
 516 m4_popdef([AT_TEST])
 517
 518 ## -------------------------------------- ##
 519 ## Syntax error discarding no lookahead.  ##
 520 ## -------------------------------------- ##
 521
 522 # After a syntax error, lalr1.cc used to not check whether there
 523 # actually is a lookahead before discarding the lookahead.  As a result,
 524 # it mistakenly invoked the destructor for the previous lookahead.
 525
 526 AT_SETUP([[Syntax error discarding no lookahead]])
 527
 528 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 529
 530 AT_DATA_GRAMMAR([[input.y]],
 531 [[%skeleton "lalr1.cc"
 532
 533 %code {
 534   #include <string>
 535   int yylex (yy::parser::semantic_type *);
 536   #define USE(Args)
 537 }
 538
 539 %define parse.error verbose
 540
 541 %nonassoc 'a' ;
 542
 543 %destructor {
 544   std::cerr << "Discarding 'a'." << std::endl;
 545 } 'a'
 546
 547 %%
 548
 549 start: error-reduce consistent-error 'a' { USE ($3); };
 550
 551 error-reduce:
 552   'a' 'a' consistent-error 'a' { USE (($1, $2, $4)); }
 553 | 'a' error { std::cerr << "Reducing 'a'." << std::endl; USE ($1); }
 554 ;
 555
 556 consistent-error:
 557   'a'
 558 | /*empty*/ %prec 'a'
 559 ;
 560
 561 // Provide another context in which all rules are useful so that this
 562 // test case looks a little more realistic.
 563 start: 'b' consistent-error ;
 564
 565 %%
 566
 567 int
 568 yylex (yy::parser::semantic_type *)
 569 {
 570   static char const *input = "aa";
 571   return *input++;
 572 }
 573
 574 void
 575 yy::parser::error (const std::string &m)
 576 {
 577   std::cerr << m << std::endl;
 578 }
 579
 580 ]AT_MAIN_DEFINE[
 581 ]])
 582
 583 AT_FULL_COMPILE([[input]])
 584 # This used to print "Discarding 'a'." again at the end.
 585 AT_PARSER_CHECK([[./input]], [[1]], [[]],
 586 [[syntax error
 587 Discarding 'a'.
 588 Reducing 'a'.
 589 ]])
 590
 591 AT_BISON_OPTION_POPDEFS
 592 AT_CLEANUP
 593
 594
 595 ## --------------------------- ##
 596 ## Syntax error as exception.  ##
 597 ## --------------------------- ##
 598
 599 AT_SETUP([[Syntax error as exception]])
 600
 601 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 602
 603 AT_DATA_GRAMMAR([[input.y]],
 604 [[%skeleton "lalr1.cc"
 605
 606 %code
 607 {
 608   #include <cstdlib>
 609   int yylex (yy::parser::semantic_type *);
 610 }
 611
 612 %define api.value.type variant
 613 %define parse.error verbose
 614 %define parse.trace
 615 %%
 616
 617 start:
 618   thing
 619 | start thing
 620 ;
 621
 622 thing:
 623   error   { std::cerr << "caught error" << std::endl; }
 624 | item
 625 ;
 626
 627 item:
 628   'a'
 629 | 's'
 630   {
 631     throw yy::parser::syntax_error ("invalid expression");
 632   }
 633
 634 %%
 635
 636 int
 637 yylex (yy::parser::semantic_type *)
 638 {
 639   // 's': syntax error, 'l': lexical error.
 640   static char const *input = "asal";
 641   switch (int res = *input++)
 642   {
 643     case 'l':
 644       throw yy::parser::syntax_error ("invalid character");
 645     default:
 646       return res;
 647   }
 648 }
 649
 650 void
 651 yy::parser::error (const std::string &m)
 652 {
 653   std::cerr << "error: " << m << std::endl;
 654 }
 655 ]AT_MAIN_DEFINE[
 656 ]])
 657
 658 AT_FULL_COMPILE([[input]])
 659
 660 AT_PARSER_CHECK([[./input]], [[0]], [[]],
 661 [[error: invalid expression
 662 caught error
 663 error: invalid character
 664 caught error
 665 ]])
 666
 667 AT_BISON_OPTION_POPDEFS
 668 AT_CLEANUP
 669
 670
 671 ## ------------------ ##
 672 ## Exception safety.  ##
 673 ## ------------------ ##
 674
 675 # AT_TEST([BISON-DIRECTIVES = ''], [WITH-RECOVERY = "with"])
 676 # ----------------------------------------------------------
 677 # Check that no object is leaked when exceptions are thrown.
 678 # WITH-RECOVERY = "with" or "without".
 679 m4_pushdef([AT_TEST],
 680 [AT_SETUP([[Exception safety $2 error recovery $1]])
 681
 682 AT_SKIP_IF_EXCEPTION_SUPPORT_IS_POOR
 683
 684 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc" $1])
 685
 686 AT_DATA_GRAMMAR([[input.yy]],
 687 [[%skeleton "lalr1.cc"
 688 %debug
 689 %error-verbose
 690 $1
 691 %code requires
 692 {
 693   #include <cassert>
 694   #include <cstdlib> // size_t and getenv.
 695   #include <iostream>
 696   #include <set>
 697
 698   bool debug = false;
 699
 700   /// A class that tracks its instances.
 701   struct Object
 702   {
 703     char val;
 704
 705     Object ()
 706       : val ('?')
 707     {
 708       log (this, "Object::Object");
 709       Object::instances.insert (this);
 710     }
 711
 712     Object (const Object& that)
 713       : val (that.val)
 714     {
 715       log (this, "Object::Object");
 716       Object::instances.insert (this);
 717     }
 718
 719     Object (char v)
 720       : val (v)
 721     {
 722       log (this, "Object::Object");
 723       Object::instances.insert (this);
 724     }
 725
 726     ~Object ()
 727     {
 728       log (this, "Object::~Object");
 729       objects::const_iterator i = instances.find (this);
 730       // Make sure this object is alive.
 731       assert (i != instances.end ());
 732       Object::instances.erase (i);
 733     }
 734
 735     Object& operator= (char v)
 736     {
 737       val = v;
 738       return *this;
 739     }
 740
 741     // Static part.
 742     typedef std::set<const Object*> objects;
 743     static objects instances;
 744
 745     static bool
 746     empty ()
 747     {
 748       return instances.empty ();
 749     }
 750
 751     static void
 752     log (Object const *o, const std::string& msg)
 753     {
 754       if (debug)
 755         {
 756           if (o)
 757             std::cerr << o << "->";
 758           std::cerr << msg << " {";
 759           const char* sep = " ";
 760           for (objects::const_iterator i = instances.begin(),
 761                                        i_end = instances.end();
 762                i != i_end;
 763                ++i)
 764             {
 765               std::cerr << sep << *i;
 766               sep = ", ";
 767             }
 768           std::cerr << " }" << std::endl;
 769         }
 770     }
 771   };
 772 }
 773
 774 %code
 775 {
 776   #include <cassert>
 777   #include <cstring> // strchr
 778   #include <stdexcept>
 779   int yylex (yy::parser::semantic_type *);
 780   Object::objects Object::instances;
 781   static char const *input;
 782 }
 783
 784 ]AT_VARIANT_IF([[
 785 %printer
 786 {
 787   yyo << &$$ << " '" << $$.val << '\'';
 788   if ($$.val == 'p')
 789     throw std::runtime_error ("printer");
 790 } <Object>;
 791
 792 %token <Object> 'a' 'E' 'e' 'p' 'R' 's' 'T'
 793 %type  <Object> list item
 794 ]], [[
 795 %union
 796 {
 797   Object *obj;
 798 }
 799 %destructor { delete $$; } <obj>;
 800 %printer
 801 {
 802   yyo << $$ << " '" << $$->val << '\'';
 803   if ($$->val == 'p')
 804     throw std::runtime_error ("printer");
 805 } <obj>;
 806
 807 %token <obj> 'a' 'E' 'e' 'p' 'R' 's' 'T'
 808 %type  <obj> list item
 809 ]])[
 810
 811 %initial-action
 812 {
 813   if (strchr (input, 'i'))
 814     throw std::runtime_error ("initial-action");
 815 }
 816
 817 %%
 818
 819 start: list {]AT_VARIANT_IF([], [ delete $][1]; )[};
 820
 821 list:
 822   item       { $$ = $][1; }
 823   // Right recursion to load the stack.
 824 | item list  { $$ = $][1; ]AT_VARIANT_IF([], [delete $][2]; )[}
 825 ;
 826
 827 item:
 828   'a'     { $$ = $][1; }
 829 | 'e'     { YYUSE ($$); YYUSE($][1); error ("syntax error"); }
 830 // Not just 'E', otherwise we reduce when 'E' is the lookahead, and
 831 // then the stack is emptied, defeating the point of the test.
 832 | 'E' 'a' { YYUSE($][1); $$ = $][2; }
 833 | 'R'     { ]AT_VARIANT_IF([], [$$ = YY_NULLPTR; delete $][1]; )[YYERROR; }
 834 | 'p'     { $$ = $][1; }
 835 | 's'     { $$ = $][1; throw std::runtime_error ("reduction"); }
 836 | 'T'     { ]AT_VARIANT_IF([], [$$ = YY_NULLPTR; delete $][1]; )[YYABORT; }
 837 ]m4_if([$2], [with],
 838 [[| error   { $$ = ]AT_VARIANT_IF([], [new ])[Object ('R'); yyerrok; }]])[
 839 ;
 840 %%
 841
 842 int
 843 yylex (yy::parser::semantic_type *lvalp)
 844 {
 845   // 'a': no error.
 846   // 'e': user action calls error.
 847   // 'E': syntax error, with yyerror that throws.
 848   // 'i': initial action throws.
 849   // 'l': yylex throws.
 850   // 'R': call YYERROR in the action
 851   // 's': reduction throws.
 852   // 'T': call YYABORT in the action
 853   switch (int res = *input++)
 854   {
 855   case 'l':
 856     throw std::runtime_error ("yylex");
 857   default:
 858     lvalp->]AT_VARIANT_IF([build (Object (res))],
 859                           [obj = new Object (res)])[;
 860     // Fall through.
 861   case 0:
 862     return res;
 863   }
 864 }
 865
 866 /* A C++ error reporting function.  */
 867 void
 868 yy::parser::error (const std::string& m)
 869 {
 870   throw std::runtime_error (m);
 871 }
 872
 873 int
 874 main (int argc, const char *argv[])
 875 {
 876   switch (argc)
 877   {
 878     case 2:
 879       input = argv[1];
 880       break;
 881     case 3:
 882       assert (std::string(argv[1]) == "--debug");
 883       debug = 1;
 884       input = argv[2];
 885       break;
 886     default:
 887       abort ();
 888   }
 889
 890   yy::parser parser;
 891   debug |= !!getenv ("YYDEBUG");
 892   parser.set_debug_level (debug);
 893   int res = 2;
 894   try
 895   {
 896     res = parser.parse ();
 897   }
 898   catch (const std::exception& e)
 899   {
 900     std::cerr << "exception caught: " << e.what () << std::endl;
 901   }
 902   catch (...)
 903   {
 904     std::cerr << "unknown exception caught" << std::endl;
 905   }
 906   Object::log (YY_NULLPTR, "end");
 907   assert (Object::empty());
 908   return res;
 909 }
 910 ]])
 911 AT_BISON_CHECK([[-o input.cc --report=all input.yy]])
 912 AT_COMPILE_CXX([[input]])
 913
 914 AT_PARSER_CHECK([[./input aaaas]], [[2]], [[]],
 915 [[exception caught: reduction
 916 ]])
 917
 918 AT_PARSER_CHECK([[./input aaaal]], [[2]], [[]],
 919 [[exception caught: yylex
 920 ]])
 921
 922 AT_PARSER_CHECK([[./input i]], [[2]], [[]],
 923 [[exception caught: initial-action
 924 ]])
 925
 926 AT_PARSER_CHECK([[./input aaaap]])
 927
 928 AT_PARSER_CHECK([[./input --debug aaaap]], [[2]], [[]], [[stderr]])
 929 AT_CHECK([[grep '^exception caught: printer$' stderr]], [], [ignore])
 930
 931 AT_PARSER_CHECK([[./input aaaae]], [[2]], [[]],
 932 [[exception caught: syntax error
 933 ]])
 934
 935 AT_PARSER_CHECK([[./input aaaaE]], [[2]], [[]],
 936 [[exception caught: syntax error, unexpected $end, expecting 'a'
 937 ]])
 938
 939 AT_PARSER_CHECK([[./input aaaaT]], [[1]])
 940
 941 AT_PARSER_CHECK([[./input aaaaR]], [m4_if([$2], [with], [0], [1])])
 942
 943 AT_BISON_OPTION_POPDEFS
 944
 945 AT_CLEANUP
 946 ])
 947
 948 AT_TEST([], [with])
 949 AT_TEST([], [without])
 950 AT_TEST([%define api.value.type variant], [with])
 951 AT_TEST([%define api.value.type variant], [without])
 952
 953 m4_popdef([AT_TEST])
 954
 955 ## ------------------------------------- ##
 956 ## C++ GLR parser identifier shadowing.  ##
 957 ## ------------------------------------- ##
 958
 959 AT_SETUP([[C++ GLR parser identifier shadowing]])
 960
 961 AT_DATA_GRAMMAR([input.yy], [
 962 %skeleton "glr.cc"
 963
 964 %union
 965 {
 966   int ival;
 967 }
 968
 969 %token <ival> ZERO;
 970
 971 %code
 972 {
 973   int yylex (yy::parser::semantic_type *yylval);
 974 }
 975
 976 %%
 977 exp: ZERO
 978
 979 %%
 980
 981 int yylex (yy::parser::semantic_type *yylval)
 982 {
 983   // Note: this argument is unused, but named on purpose.  There used to be a
 984   // bug with a macro that erroneously expanded this identifier to
 985   // yystackp->yyval.
 986   YYUSE (yylval);
 987   return yy::parser::token::ZERO;
 988 }
 989
 990 void yy::parser::error (std::string const&)
 991 {}
 992
 993 int main ()
 994 {}
 995 ])
 996
 997 AT_BISON_CHECK([[-o input.cc input.yy]])
 998 AT_COMPILE_CXX([[input]])
 999
1000 AT_CLEANUP