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;
 256
 257 %printer { yyo << $$; }
 258   <int> <::std::string> <::std::list<std::string>>;
 259 %destructor { std::cerr << "Destroy: " << $$ << '\n'; } <*>;
 260 %destructor { std::cerr << "Destroy: \"" << $$ << "\"\n"; } <::std::string>;
 261 %%
 262
 263 result:
 264   list          { std::cout << $][1 << std::endl; }
 265 ;
 266
 267 list:
 268   item          { $$.push_back ($][1); }
 269 | list "," item { std::swap ($$, $][1); $$.push_back ($][3); }
 270 | list error    { std::swap ($$, $][1); }
 271 ;
 272
 273 item:
 274   TEXT          { std::swap ($$, $][1); }
 275 | NUMBER        { if ($][1 == 3) YYERROR; else $$ = to_string ($][1); }
 276 ;
 277 %%
 278 ]AT_TOKEN_CTOR_IF([],
 279 [[#ifdef TWO_STAGE_BUILD
 280 # define BUILD(Type, Value) build<Type> () = Value
 281 #else
 282 # define BUILD(Type, Value) build (Value)
 283 #endif
 284 ]])[
 285 #define STAGE_MAX 5
 286 namespace yy
 287 {
 288   static]AT_TOKEN_CTOR_IF([[
 289   parser::symbol_type yylex ()]], [[
 290   parser::token_type yylex (parser::semantic_type* yylval]AT_LOCATION_IF([,
 291                             parser::location_type* yylloc])[)]])[
 292   {]AT_LOCATION_IF([
 293     typedef parser::location_type location;])[
 294     // The 5 is a syntax error whose recovery requires that we discard
 295     // the lookahead.  This tests a regression, see
 296     // <http://savannah.gnu.org/support/?108481>.
 297     static char const *input = "0,1,2,3,45,6";
 298     switch (int stage = *input++)
 299     {
 300       case 0:]AT_TOKEN_CTOR_IF([[
 301         return parser::make_END_OF_FILE (]AT_LOCATION_IF([location ()])[);]],
 302 [AT_LOCATION_IF([
 303         *yylloc = location ();])[
 304         return parser::token::END_OF_FILE;]])[
 305
 306       case ',':
 307         ]AT_TOKEN_CTOR_IF([[
 308         return parser::make_COMMA (]AT_LOCATION_IF([location ()])[);]], [[
 309 ]AT_LOCATION_IF([
 310         *yylloc = location ();])[
 311         return parser::token::COMMA;]])[
 312
 313       default:
 314         stage = stage - '0';
 315         if (stage % 2)
 316          {]AT_TOKEN_CTOR_IF([[
 317            return parser::make_NUMBER (stage]AT_LOCATION_IF([, location ()])[);]], [[
 318            yylval->BUILD (int, stage);]AT_LOCATION_IF([
 319            *yylloc = location ();])[
 320            return parser::token::NUMBER;]])[
 321          }
 322        else
 323          {]AT_TOKEN_CTOR_IF([[
 324            return parser::make_TEXT (to_string (stage)]AT_LOCATION_IF([, location ()])[);]], [[
 325            yylval->BUILD (std::string, to_string (stage));]AT_LOCATION_IF([
 326            *yylloc = location ();])[
 327            return parser::token::TEXT;]])[
 328          }
 329     }
 330
 331     abort ();
 332   }
 333 }
 334
 335 ]AT_YYERROR_DEFINE[
 336 ]AT_MAIN_DEFINE[
 337 ]])
 338
 339 AT_FULL_COMPILE([list])
 340 AT_PARSER_CHECK([./list], 0,
 341 [[(0, 1, 2, 4, 6)
 342 ]],
 343 [[Destroy: ""
 344 Destroy: "0"
 345 Destroy: (0)
 346 Destroy: 1
 347 Destroy: "1"
 348 Destroy: ()
 349 Destroy: ""
 350 Destroy: "2"
 351 Destroy: ()
 352 Destroy: ""
 353 Destroy: 3
 354 Destroy: ()
 355 Destroy: ""
 356 Destroy: "4"
 357 Destroy: ()
 358 Destroy: ()
 359 Destroy: 5
 360 Destroy: ()
 361 Destroy: ""
 362 Destroy: "6"
 363 Destroy: ()
 364 Destroy: (0, 1, 2, 4, 6)
 365 ]])
 366
 367 AT_BISON_OPTION_POPDEFS
 368 AT_CLEANUP
 369 ])
 370
 371 AT_TEST([[%skeleton "lalr1.cc" ]])
 372 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert]])
 373 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert %locations]])
 374 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert %code {\n#define TWO_STAGE_BUILD\n}]])
 375 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert %define api.token.constructor]])
 376 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert %define api.token.constructor %define api.token.prefix {TOK_}]])
 377 AT_TEST([[%skeleton "lalr1.cc" %define parse.assert %define api.token.constructor %define api.token.prefix {TOK_} %locations]])
 378
 379 m4_popdef([AT_TEST])
 380
 381
 382 ## ----------------------- ##
 383 ## Doxygen Documentation.  ##
 384 ## ----------------------- ##
 385
 386 m4_define([AT_CHECK_DOXYGEN],
 387 [m4_case([$1],
 388          [Public],  [m4_pushdef([AT_DOXYGEN_PRIVATE], [NO])],
 389          [Private], [m4_pushdef([AT_DOXYGEN_PRIVATE], [YES])],
 390          [m4_fatal([invalid argument: $1])])
 391 AT_SETUP([Doxygen $1 Documentation])
 392
 393 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 394 AT_DATA([input.yy],
 395 [[%skeleton "lalr1.cc"
 396 %locations
 397 %defines
 398 %debug
 399 %%
 400 exp: /* empty */;
 401 %%
 402 ]AT_YYERROR_DEFINE[
 403 ]])
 404
 405 AT_BISON_CHECK([-o input.cc input.yy])
 406
 407 AT_DATA([Doxyfile],
 408 [# The PROJECT_NAME tag is a single word (or a sequence of words
 409 # surrounded by quotes) that should identify the project.
 410 PROJECT_NAME = "Bison C++ Parser"
 411
 412 # The QUIET tag can be used to turn on/off the messages that are
 413 # generated by doxygen. Possible values are YES and NO. If left blank
 414 # NO is used.
 415 QUIET = YES
 416
 417 # The WARNINGS tag can be used to turn on/off the warning messages
 418 # that are generated by doxygen. Possible values are YES and NO. If
 419 # left blank NO is used.
 420 WARNINGS     = YES
 421 # If WARN_IF_UNDOCUMENTED is set to YES, then doxygen will generate
 422 # warnings for undocumented members. If EXTRACT_ALL is set to YES then
 423 # this flag will automatically be disabled.
 424 WARN_IF_UNDOCUMENTED   = YES
 425 # If WARN_IF_DOC_ERROR is set to YES, doxygen will generate warnings
 426 # for potential errors in the documentation, such as not documenting
 427 # some parameters in a documented function, or documenting parameters
 428 # that don't exist or using markup commands wrongly.
 429 WARN_IF_DOC_ERROR      = YES
 430 # The WARN_FORMAT tag determines the format of the warning messages
 431 # that doxygen can produce. The string should contain the $file,
 432 # $line, and $text tags, which will be replaced by the file and line
 433 # number from which the warning originated and the warning text.
 434 WARN_FORMAT            = "$file:$line: $text"
 435
 436 # If the EXTRACT_ALL tag is set to YES doxygen will assume all
 437 # entities in documentation are documented, even if no documentation
 438 # was available.  Private class members and static file members will
 439 # be hidden unless the EXTRACT_PRIVATE and EXTRACT_STATIC tags are set
 440 # to YES
 441 EXTRACT_ALL            = YES
 442
 443 # If the EXTRACT_PRIVATE tag is set to YES all private members of a
 444 # class will be included in the documentation.
 445 EXTRACT_PRIVATE        = AT_DOXYGEN_PRIVATE
 446
 447 # If the EXTRACT_STATIC tag is set to YES all static members of a file
 448 # will be included in the documentation.
 449 EXTRACT_STATIC         = AT_DOXYGEN_PRIVATE
 450 ])
 451
 452 AT_CHECK([doxygen --version || exit 77], 0, ignore)
 453 AT_CHECK([doxygen], 0, [], [ignore])
 454
 455 AT_BISON_OPTION_POPDEFS
 456 AT_CLEANUP
 457
 458 m4_popdef([AT_DOXYGEN_PRIVATE])
 459 ])# AT_CHECK_DOXYGEN
 460
 461 AT_CHECK_DOXYGEN([Public])
 462 AT_CHECK_DOXYGEN([Private])
 463
 464
 465 ## ------------ ##
 466 ## Namespaces.  ##
 467 ## ------------ ##
 468
 469 # AT_TEST(NAMESPACE-DECL, [COMPILE-ERROR])
 470 # ----------------------------------------
 471 # See if Bison can handle %define namespace "NAMESPACE-DECL".  If COMPILE-ERROR
 472 # is specified, then Bison should accept the input, but compilation will fail,
 473 # so don't check compilation.
 474 m4_pushdef([AT_TEST],
 475 [AT_BISON_OPTION_PUSHDEFS([%language "C++" %define api.namespace {$1}])
 476 AT_DATA_GRAMMAR([[input.yy]],
 477 [[%language "C++"
 478 %define api.namespace {]$1[}
 479 %union { int i; }
 480 %define global_tokens_and_yystype
 481 %locations
 482
 483 %code {
 484   // YYSTYPE contains a namespace reference.
 485   int yylex (YYSTYPE *lval, const ]$1[::parser::location_type*) {
 486     lval->i = 3;
 487     return 0;
 488   }
 489 }
 490
 491 %%
 492
 493 start: ;
 494
 495 %%
 496
 497 void
 498 ]$1[::parser::error (const ]$1[::parser::location_type &loc,
 499                      const std::string &msg)
 500 {
 501   std::cerr << "At " << loc << ": " << msg << std::endl;
 502 }
 503
 504 ]AT_MAIN_DEFINE[
 505 ]])
 506
 507
 508 AT_BISON_CHECK([[-o input.cc input.yy]])
 509
 510 m4_if([$#], [1],
 511 [AT_COMPILE_CXX([[input]])
 512 AT_PARSER_CHECK([[./input]])])
 513 AT_BISON_OPTION_POPDEFS
 514 ])
 515
 516 AT_SETUP([[Relative namespace references]])
 517 AT_TEST([[foo]])
 518 AT_TEST([[foo::bar]])
 519 AT_TEST([[foo::bar::baz]])
 520 AT_CLEANUP
 521
 522 AT_SETUP([[Absolute namespace references]])
 523 AT_TEST([[::foo]])
 524 AT_TEST([[::foo::bar]])
 525 AT_TEST([[::foo::bar::baz]])
 526 AT_TEST([[@tb@::foo]])
 527 AT_TEST([[  @tb@ ::foo::bar]])
 528 AT_TEST([[  ::foo::bar::baz]])
 529 AT_CLEANUP
 530
 531 AT_SETUP([[Syntactically invalid namespace references]])
 532 AT_TEST([[:foo:bar]], [[-]])
 533 AT_TEST([[foo: :bar]], [[-]])
 534 # This one is interesting because '[3]' is encoded as '@<:@3@:>@', which
 535 # contains single occurrences of ':'.
 536 AT_TEST([[foo[3]::bar::baz]], [[-]])
 537 AT_TEST([[foo::bar,baz]], [[-]])
 538 AT_TEST([[foo::bar::(baz /* Pacify Emacs ) */]], [[-]])
 539 AT_CLEANUP
 540
 541 m4_popdef([AT_TEST])
 542
 543 ## -------------------------------------- ##
 544 ## Syntax error discarding no lookahead.  ##
 545 ## -------------------------------------- ##
 546
 547 # After a syntax error, lalr1.cc used to not check whether there
 548 # actually is a lookahead before discarding the lookahead.  As a result,
 549 # it mistakenly invoked the destructor for the previous lookahead.
 550
 551 AT_SETUP([[Syntax error discarding no lookahead]])
 552
 553 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 554
 555 AT_DATA_GRAMMAR([[input.y]],
 556 [[%skeleton "lalr1.cc"
 557
 558 %code {
 559   #include <string>
 560   int yylex (yy::parser::semantic_type *);
 561   #define USE(Args)
 562 }
 563
 564 %define parse.error verbose
 565
 566 %nonassoc 'a' ;
 567
 568 %destructor {
 569   std::cerr << "Discarding 'a'." << std::endl;
 570 } 'a'
 571
 572 %%
 573
 574 start: error-reduce consistent-error 'a' { USE ($3); };
 575
 576 error-reduce:
 577   'a' 'a' consistent-error 'a' { USE (($1, $2, $4)); }
 578 | 'a' error { std::cerr << "Reducing 'a'." << std::endl; USE ($1); }
 579 ;
 580
 581 consistent-error:
 582   'a'
 583 | /*empty*/ %prec 'a'
 584 ;
 585
 586 // Provide another context in which all rules are useful so that this
 587 // test case looks a little more realistic.
 588 start: 'b' consistent-error ;
 589
 590 %%
 591
 592 int
 593 yylex (yy::parser::semantic_type *)
 594 {
 595   static char const *input = "aa";
 596   return *input++;
 597 }
 598
 599 void
 600 yy::parser::error (const std::string &m)
 601 {
 602   std::cerr << m << std::endl;
 603 }
 604
 605 ]AT_MAIN_DEFINE[
 606 ]])
 607
 608 AT_FULL_COMPILE([[input]])
 609 # This used to print "Discarding 'a'." again at the end.
 610 AT_PARSER_CHECK([[./input]], [[1]], [[]],
 611 [[syntax error
 612 Discarding 'a'.
 613 Reducing 'a'.
 614 ]])
 615
 616 AT_BISON_OPTION_POPDEFS
 617 AT_CLEANUP
 618
 619
 620 ## --------------------------- ##
 621 ## Syntax error as exception.  ##
 622 ## --------------------------- ##
 623
 624 AT_SETUP([[Syntax error as exception]])
 625
 626 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc"])
 627
 628 AT_DATA_GRAMMAR([[input.y]],
 629 [[%skeleton "lalr1.cc"
 630
 631 %code
 632 {
 633   #include <cstdlib>
 634   int yylex (yy::parser::semantic_type *);
 635 }
 636
 637 %define api.value.type variant
 638 %define parse.error verbose
 639 %define parse.trace
 640 %%
 641
 642 start:
 643   thing
 644 | start thing
 645 ;
 646
 647 thing:
 648   error   { std::cerr << "caught error" << std::endl; }
 649 | item
 650 ;
 651
 652 item:
 653   'a'
 654 | 's'
 655   {
 656     throw yy::parser::syntax_error ("invalid expression");
 657   }
 658
 659 %%
 660
 661 int
 662 yylex (yy::parser::semantic_type *)
 663 {
 664   // 's': syntax error, 'l': lexical error.
 665   static char const *input = "asal";
 666   switch (int res = *input++)
 667   {
 668     case 'l':
 669       throw yy::parser::syntax_error ("invalid character");
 670     default:
 671       return res;
 672   }
 673 }
 674
 675 void
 676 yy::parser::error (const std::string &m)
 677 {
 678   std::cerr << "error: " << m << std::endl;
 679 }
 680 ]AT_MAIN_DEFINE[
 681 ]])
 682
 683 AT_FULL_COMPILE([[input]])
 684
 685 AT_PARSER_CHECK([[./input]], [[0]], [[]],
 686 [[error: invalid expression
 687 caught error
 688 error: invalid character
 689 caught error
 690 ]])
 691
 692 AT_BISON_OPTION_POPDEFS
 693 AT_CLEANUP
 694
 695
 696 ## ------------------ ##
 697 ## Exception safety.  ##
 698 ## ------------------ ##
 699
 700 # AT_TEST([BISON-DIRECTIVES = ''], [WITH-RECOVERY = "with"])
 701 # ----------------------------------------------------------
 702 # Check that no object is leaked when exceptions are thrown.
 703 # WITH-RECOVERY = "with" or "without".
 704 m4_pushdef([AT_TEST],
 705 [AT_SETUP([[Exception safety $2 error recovery $1]])
 706
 707 AT_SKIP_IF_EXCEPTION_SUPPORT_IS_POOR
 708
 709 AT_BISON_OPTION_PUSHDEFS([%skeleton "lalr1.cc" $1])
 710
 711 AT_DATA_GRAMMAR([[input.yy]],
 712 [[%skeleton "lalr1.cc"
 713 %debug
 714 %error-verbose
 715 $1
 716 %code requires
 717 {
 718   #include <cassert>
 719   #include <cstdlib> // size_t and getenv.
 720   #include <iostream>
 721   #include <set>
 722   #include <string>
 723
 724   bool debug = false;
 725
 726   /// A class that tracks its instances.
 727   struct Object
 728   {
 729     char val;
 730
 731     Object ()
 732       : val ('?')
 733     {
 734       log (this, "Object::Object");
 735       Object::instances.insert (this);
 736     }
 737
 738     Object (const Object& that)
 739       : val (that.val)
 740     {
 741       log (this, "Object::Object");
 742       Object::instances.insert (this);
 743     }
 744
 745     Object (char v)
 746       : val (v)
 747     {
 748       log (this, "Object::Object");
 749       Object::instances.insert (this);
 750     }
 751
 752     ~Object ()
 753     {
 754       log (this, "Object::~Object");
 755       objects::iterator i = instances.find (this);
 756       // Make sure this object is alive.
 757       assert (i != instances.end ());
 758       Object::instances.erase (i);
 759     }
 760
 761     Object& operator= (char v)
 762     {
 763       val = v;
 764       return *this;
 765     }
 766
 767     // Static part.
 768     typedef std::set<const Object*> objects;
 769     static objects instances;
 770
 771     static bool
 772     empty ()
 773     {
 774       return instances.empty ();
 775     }
 776
 777     static void
 778     log (Object const *o, const std::string& msg)
 779     {
 780       if (debug)
 781         {
 782           if (o)
 783             std::cerr << o << "->";
 784           std::cerr << msg << " {";
 785           const char* sep = " ";
 786           for (objects::const_iterator i = instances.begin(),
 787                                        i_end = instances.end();
 788                i != i_end;
 789                ++i)
 790             {
 791               std::cerr << sep << *i;
 792               sep = ", ";
 793             }
 794           std::cerr << " }" << std::endl;
 795         }
 796     }
 797   };
 798 }
 799
 800 %code
 801 {
 802   #include <cassert>
 803   #include <cstring> // strchr
 804   #include <stdexcept>
 805   int yylex (yy::parser::semantic_type *);
 806   Object::objects Object::instances;
 807   static char const *input;
 808 }
 809
 810 ]AT_VARIANT_IF([[
 811 %printer
 812 {
 813   yyo << &$$ << " '" << $$.val << '\'';
 814   if ($$.val == 'p')
 815     throw std::runtime_error ("printer");
 816 } <Object>;
 817
 818 %token <Object> 'a' 'E' 'e' 'p' 'R' 's' 'T'
 819 %type  <Object> list item
 820 ]], [[
 821 %union
 822 {
 823   Object *obj;
 824 }
 825 %destructor { delete $$; } <obj>;
 826 %printer
 827 {
 828   yyo << $$ << " '" << $$->val << '\'';
 829   if ($$->val == 'p')
 830     throw std::runtime_error ("printer");
 831 } <obj>;
 832
 833 %token <obj> 'a' 'E' 'e' 'p' 'R' 's' 'T'
 834 %type  <obj> list item
 835 ]])[
 836
 837 %initial-action
 838 {
 839   if (strchr (input, 'i'))
 840     throw std::runtime_error ("initial-action");
 841 }
 842
 843 %%
 844
 845 start: list {]AT_VARIANT_IF([], [ delete $][1]; )[};
 846
 847 list:
 848   item       { $$ = $][1; }
 849   // Right recursion to load the stack.
 850 | item list  { $$ = $][1; ]AT_VARIANT_IF([], [delete $][2]; )[}
 851 ;
 852
 853 item:
 854   'a'     { $$ = $][1; }
 855 | 'e'     { YYUSE ($$); YYUSE ($][1); error ("syntax error"); }
 856 // Not just 'E', otherwise we reduce when 'E' is the lookahead, and
 857 // then the stack is emptied, defeating the point of the test.
 858 | 'E' 'a' { YYUSE ($][1); $$ = $][2; }
 859 | 'R'     { ]AT_VARIANT_IF([], [$$ = YY_NULLPTR; delete $][1]; )[YYERROR; }
 860 | 'p'     { $$ = $][1; }
 861 | 's'     { $$ = $][1; throw std::runtime_error ("reduction"); }
 862 | 'T'     { ]AT_VARIANT_IF([], [$$ = YY_NULLPTR; delete $][1]; )[YYABORT; }
 863 ]m4_if([$2], [with],
 864 [[| error   { $$ = ]AT_VARIANT_IF([], [new ])[Object ('R'); yyerrok; }]])[
 865 ;
 866 %%
 867
 868 int
 869 yylex (yy::parser::semantic_type *lvalp)
 870 {
 871   // 'a': no error.
 872   // 'e': user action calls error.
 873   // 'E': syntax error, with yyerror that throws.
 874   // 'i': initial action throws.
 875   // 'l': yylex throws.
 876   // 'R': call YYERROR in the action
 877   // 's': reduction throws.
 878   // 'T': call YYABORT in the action
 879   switch (int res = *input++)
 880   {
 881   case 'l':
 882     throw std::runtime_error ("yylex");
 883   default:
 884     lvalp->]AT_VARIANT_IF([build (Object (res))],
 885                           [obj = new Object (res)])[;
 886     // Fall through.
 887   case 0:
 888     return res;
 889   }
 890 }
 891
 892 /* A C++ error reporting function.  */
 893 void
 894 yy::parser::error (const std::string& m)
 895 {
 896   throw std::runtime_error (m);
 897 }
 898
 899 int
 900 main (int argc, const char *argv[])
 901 {
 902   switch (argc)
 903   {
 904     case 2:
 905       input = argv[1];
 906       break;
 907     case 3:
 908       assert (std::string(argv[1]) == "--debug");
 909       debug = 1;
 910       input = argv[2];
 911       break;
 912     default:
 913       abort ();
 914   }
 915
 916   yy::parser parser;
 917   debug |= !!getenv ("YYDEBUG");
 918   parser.set_debug_level (debug);
 919   int res = 2;
 920   try
 921   {
 922     res = parser.parse ();
 923   }
 924   catch (const std::exception& e)
 925   {
 926     std::cerr << "exception caught: " << e.what () << std::endl;
 927   }
 928   catch (...)
 929   {
 930     std::cerr << "unknown exception caught" << std::endl;
 931   }
 932   Object::log (YY_NULLPTR, "end");
 933   assert (Object::empty());
 934   return res;
 935 }
 936 ]])
 937 AT_BISON_CHECK([[-o input.cc --report=all input.yy]])
 938 AT_COMPILE_CXX([[input]])
 939
 940 AT_PARSER_CHECK([[./input aaaas]], [[2]], [[]],
 941 [[exception caught: reduction
 942 ]])
 943
 944 AT_PARSER_CHECK([[./input aaaal]], [[2]], [[]],
 945 [[exception caught: yylex
 946 ]])
 947
 948 AT_PARSER_CHECK([[./input i]], [[2]], [[]],
 949 [[exception caught: initial-action
 950 ]])
 951
 952 AT_PARSER_CHECK([[./input aaaap]])
 953
 954 AT_PARSER_CHECK([[./input --debug aaaap]], [[2]], [[]], [[stderr]])
 955 AT_CHECK([[grep '^exception caught: printer$' stderr]], [], [ignore])
 956
 957 AT_PARSER_CHECK([[./input aaaae]], [[2]], [[]],
 958 [[exception caught: syntax error
 959 ]])
 960
 961 AT_PARSER_CHECK([[./input aaaaE]], [[2]], [[]],
 962 [[exception caught: syntax error, unexpected $end, expecting 'a'
 963 ]])
 964
 965 AT_PARSER_CHECK([[./input aaaaT]], [[1]])
 966
 967 AT_PARSER_CHECK([[./input aaaaR]], [m4_if([$2], [with], [0], [1])])
 968
 969 AT_BISON_OPTION_POPDEFS
 970
 971 AT_CLEANUP
 972 ])
 973
 974 AT_TEST([], [with])
 975 AT_TEST([], [without])
 976 AT_TEST([%define api.value.type variant], [with])
 977 AT_TEST([%define api.value.type variant], [without])
 978
 979 m4_popdef([AT_TEST])
 980
 981 ## ------------------------------------- ##
 982 ## C++ GLR parser identifier shadowing.  ##
 983 ## ------------------------------------- ##
 984
 985 AT_SETUP([[C++ GLR parser identifier shadowing]])
 986
 987 AT_DATA_GRAMMAR([input.yy], [
 988 %skeleton "glr.cc"
 989
 990 %union
 991 {
 992   int ival;
 993 }
 994
 995 %token <ival> ZERO;
 996
 997 %code
 998 {
 999   int yylex (yy::parser::semantic_type *yylval);
1000 }
1001
1002 %%
1003 exp: ZERO
1004
1005 %%
1006
1007 int yylex (yy::parser::semantic_type *yylval)
1008 {
1009   // Note: this argument is unused, but named on purpose.  There used to be a
1010   // bug with a macro that erroneously expanded this identifier to
1011   // yystackp->yyval.
1012   YYUSE (yylval);
1013   return yy::parser::token::ZERO;
1014 }
1015
1016 void yy::parser::error (std::string const&)
1017 {}
1018
1019 int main ()
1020 {}
1021 ])
1022
1023 AT_BISON_CHECK([[-o input.cc input.yy]])
1024 AT_COMPILE_CXX([[input]])
1025
1026 AT_CLEANUP