X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/141f57937b5fe3f5c49d635fffbd4bddbfa03d69..58b90cc2d82b068770bd38b5dff41e24a4bfeb37:/data/lalr1.cc?ds=sidebyside diff --git a/data/lalr1.cc b/data/lalr1.cc index e6190c8b..bc1bec12 100644 --- a/data/lalr1.cc +++ b/data/lalr1.cc @@ -19,95 +19,7 @@ m4_divert(-1) # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA # 02110-1301 USA -## ---------------- ## -## Default values. ## -## ---------------- ## - -# Default parser class name. -m4_define_default([b4_parser_class_name], [parser]) - - - -## ----------------- ## -## Semantic Values. ## -## ----------------- ## - - -# b4_lhs_value([TYPE]) -# -------------------- -# Expansion of $$. -m4_define([b4_lhs_value], -[(yyval[]m4_ifval([$1], [.$1]))]) - - -# b4_rhs_value(RULE-LENGTH, NUM, [TYPE]) -# -------------------------------------- -# Expansion of $NUM, where the current rule has RULE-LENGTH -# symbols on RHS. -m4_define([b4_rhs_value], -[(yysemantic_stack_@{m4_eval([$1 - $2])@}m4_ifval([$3], [.$3]))]) - -m4_define_default([b4_location_type], [location]) -m4_define_default([b4_filename_type], [std::string]) - -# b4_lhs_location() -# ----------------- -# Expansion of @$. -m4_define([b4_lhs_location], -[(yyloc)]) - - -# b4_rhs_location(RULE-LENGTH, NUM) -# --------------------------------- -# Expansion of @NUM, where the current rule has RULE-LENGTH symbols -# on RHS. -m4_define([b4_rhs_location], -[(yylocation_stack_@{m4_eval([$1 - $2])@})]) - - -# b4_parse_param_decl -# ------------------- -# Extra formal arguments of the constructor. -# Change the parameter names from "foo" into "foo_yyarg", so that -# there is no collision bw the user chosen attribute name, and the -# argument name in the constructor. -m4_define([b4_parse_param_decl], -[m4_ifset([b4_parse_param], - [m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])]) - -m4_define([b4_parse_param_decl_1], -[$1_yyarg]) - - - -# b4_parse_param_cons -# ------------------- -# Extra initialisations of the constructor. -m4_define([b4_parse_param_cons], - [m4_ifset([b4_parse_param], - [, - b4_cc_constructor_calls(b4_parse_param)])]) -m4_define([b4_cc_constructor_calls], - [m4_map_sep([b4_cc_constructor_call], [, - ], [$@])]) -m4_define([b4_cc_constructor_call], - [$2 ($2_yyarg)]) - -# b4_parse_param_vars -# ------------------- -# Extra instance variables. -m4_define([b4_parse_param_vars], - [m4_ifset([b4_parse_param], - [ - /* User arguments. */ -b4_cc_var_decls(b4_parse_param)])]) -m4_define([b4_cc_var_decls], - [m4_map_sep([b4_cc_var_decl], [ -], [$@])]) -m4_define([b4_cc_var_decl], - [ $1;]) - - +m4_include(b4_pkgdatadir/[c++.m4]) # We do want M4 expansion after # for CPP macros. m4_changecom() @@ -133,7 +45,7 @@ namespace yy class location; } -]b4_token_defines(b4_tokens)[ +]b4_token_enums(b4_tokens)[ /* Copy the first part of user declarations. */ ]b4_pre_prologue[ @@ -157,6 +69,12 @@ b4_syncline([@oline@], [@ofile@])[ # define YYERROR_VERBOSE ]b4_error_verbose[ #endif +#if YYERROR_VERBOSE +# define YYERROR_VERBOSE_IF(x) x +#else +# define YYERROR_VERBOSE_IF(x) /* empty */ +#endif + /* Enabling the token table. */ #ifndef YYTOKEN_TABLE # define YYTOKEN_TABLE ]b4_token_table[ @@ -164,7 +82,7 @@ b4_syncline([@oline@], [@ofile@])[ #if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED) ]m4_ifdef([b4_stype], -[b4_syncline([b4_stype_line], [b4_filename]) +[b4_syncline([b4_stype_line], [b4_file_name]) union YYSTYPE b4_stype; /* Line __line__ of lalr1.cc. */ b4_syncline([@oline@], [@ofile@])], @@ -200,33 +118,14 @@ do { \ namespace yy { - class ]b4_parser_class_name[; - - template - struct traits - { - }; - - template <> - struct traits<]b4_parser_class_name[> - { - typedef ]b4_int_type_for([b4_translate])[ token_number_type; - typedef ]b4_int_type_for([b4_rhs])[ rhs_number_type; - typedef int state_type; - typedef YYSTYPE semantic_type; - typedef ]b4_location_type[ location_type; - }; -} -namespace yy -{ /// A Bison parser. class ]b4_parser_class_name[ { /// Symbol semantic values. - typedef traits<]b4_parser_class_name[>::semantic_type semantic_type; + typedef YYSTYPE semantic_type; /// Symbol locations. - typedef traits<]b4_parser_class_name[>::location_type location_type; + typedef ]b4_location_type[ location_type; public: /// Build a parser object. @@ -257,17 +156,14 @@ namespace yy void set_debug_level (debug_level_type l); private: - - /// Call the scanner. - virtual void yylex_ (); - /// Report a syntax error. /// \param loc where the syntax error is found. /// \param msg a description of the syntax error. virtual void error (const location_type& loc, const std::string& msg); - /// Generate an error message, and invoke error. - virtual void yyreport_syntax_error_ (); + /// Generate an error message. + /// \param tok the look-ahead token. + virtual std::string yysyntax_error_ (YYERROR_VERBOSE_IF (int tok)); #if YYDEBUG /// \brief Report a symbol on the debug stream. @@ -281,7 +177,7 @@ namespace yy /// State numbers. - typedef traits<]b4_parser_class_name[>::state_type state_type; + typedef int state_type; /// State stack type. typedef stack state_stack_type; /// Semantic value stack type. @@ -297,7 +193,7 @@ namespace yy location_stack_type yylocation_stack_; /// Internal symbol numbers. - typedef traits<]b4_parser_class_name[>::token_number_type token_number_type; + typedef ]b4_int_type_for([b4_translate])[ token_number_type; /* Tables. */ /// For a state, the index in \a yytable_ of its portion. static const ]b4_int_type_for([b4_pact])[ yypact_[]; @@ -341,7 +237,7 @@ namespace yy #if YYDEBUG /// A type to store symbol numbers and -1. - typedef traits<]b4_parser_class_name[>::rhs_number_type rhs_number_type; + typedef ]b4_int_type_for([b4_rhs])[ rhs_number_type; /// A `-1'-separated list of the rules' RHS. static const rhs_number_type yyrhs_[]; /// For each rule, the index of the first RHS symbol in \a yyrhs_. @@ -398,21 +294,6 @@ namespace yy int yydebug_; std::ostream* yycdebug_; - /* Look-ahead and look-ahead in internal form. */ - int yylooka_; - int yyilooka_; - - /// Semantic value of the look-ahead. - semantic_type yylval; - /// Location of the look-ahead. - location_type yylloc; - /// The locations where the error started and ended. - location yyerror_range_[2]; - - /// $$. - semantic_type yyval; - /// @@$. - location_type yyloc; ]b4_parse_param_vars[ }; } @@ -610,6 +491,22 @@ yy::]b4_parser_class_name[::set_debug_level (debug_level_type l) int yy::]b4_parser_class_name[::parse () { + /// Look-ahead and look-ahead in internal form. + int yychar; + int yytoken; + + /// Semantic value of the look-ahead. + semantic_type yylval; + /// Location of the look-ahead. + location_type yylloc; + /// The locations where the error started and ended. + location yyerror_range[2]; + + /// $$. + semantic_type yyval; + /// @@$. + location_type yyloc; + int yyresult_; YYCDEBUG << "Starting parse" << std::endl; @@ -619,7 +516,7 @@ yy::]b4_parser_class_name[::parse () /* Start. */ yystate_ = 0; - yylooka_ = yyempty_; + yychar = yyempty_; ]m4_ifdef([b4_initial_action], [ m4_pushdef([b4_at_dollar], [yylloc])dnl @@ -656,25 +553,32 @@ yybackup: goto yydefault; /* Read a look-ahead token. */ - if (yylooka_ == yyempty_) - yylex_ (); + if (yychar == yyempty_) + { + YYCDEBUG << "Reading a token: "; + yychar = ]b4_c_function_call([yylex], [int], +[[YYSTYPE*], [&yylval]][]dnl +b4_location_if([, [[location*], [&yylloc]]])dnl +m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; + } + /* Convert token to internal form. */ - if (yylooka_ <= yyeof_) + if (yychar <= yyeof_) { - yylooka_ = yyilooka_ = yyeof_; + yychar = yytoken = yyeof_; YYCDEBUG << "Now at end of input." << std::endl; } else { - yyilooka_ = yytranslate_ (yylooka_); - YY_SYMBOL_PRINT ("Next token is", yyilooka_, &yylval, &yylloc); + yytoken = yytranslate_ (yychar); + YY_SYMBOL_PRINT ("Next token is", yytoken, &yylval, &yylloc); } /* If the proper action on seeing token ILOOKA_ is to reduce or to detect an error, take that action. */ - yyn_ += yyilooka_; - if (yyn_ < 0 || yylast_ < yyn_ || yycheck_[yyn_] != yyilooka_) + yyn_ += yytoken; + if (yyn_ < 0 || yylast_ < yyn_ || yycheck_[yyn_] != yytoken) goto yydefault; /* Reduce or error. */ @@ -697,11 +601,11 @@ yybackup: goto yyacceptlab; /* Shift the look-ahead token. */ - YY_SYMBOL_PRINT ("Shifting", yyilooka_, &yylval, &yylloc); + YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc); /* Discard the token being shifted unless it is eof. */ - if (yylooka_ != yyeof_) - yylooka_ = yyempty_; + if (yychar != yyeof_) + yychar = yyempty_; yysemantic_stack_.push (yylval); yylocation_stack_.push (yylloc); @@ -775,24 +679,28 @@ b4_syncline([@oline@], [@ofile@])[ `------------------------------------*/ yyerrlab: /* If not already recovering from an error, report this error. */ - yyreport_syntax_error_ (); + if (!yyerrstatus_) + { + ++yynerrs_; + error (yylloc, yysyntax_error_ (YYERROR_VERBOSE_IF (yytoken))); + } - yyerror_range_[0] = yylloc; + yyerror_range[0] = yylloc; if (yyerrstatus_ == 3) { /* If just tried and failed to reuse look-ahead token after an error, discard it. */ - if (yylooka_ <= yyeof_) + if (yychar <= yyeof_) { /* Return failure if at end of input. */ - if (yylooka_ == yyeof_) + if (yychar == yyeof_) YYABORT; } else { - yydestruct_ ("Error: discarding", yyilooka_, &yylval, &yylloc); - yylooka_ = yyempty_; + yydestruct_ ("Error: discarding", yytoken, &yylval, &yylloc); + yychar = yyempty_; } } @@ -812,7 +720,7 @@ yyerrorlab: if (false) goto yyerrorlab; - yyerror_range_[0] = yylocation_stack_[yylen_ - 1]; + yyerror_range[0] = yylocation_stack_[yylen_ - 1]; yypop_ (yylen_); yystate_ = yystate_stack_[0]; goto yyerrlab1; @@ -841,7 +749,7 @@ yyerrlab1: if (yystate_stack_.height () == 1) YYABORT; - yyerror_range_[0] = yylocation_stack_[0]; + yyerror_range[0] = yylocation_stack_[0]; yydestruct_ ("Error: popping", yystos_[yystate_], &yysemantic_stack_[0], &yylocation_stack_[0]); @@ -853,10 +761,10 @@ yyerrlab1: if (yyn_ == yyfinal_) goto yyacceptlab; - yyerror_range_[1] = yylloc; + yyerror_range[1] = yylloc; // Using YYLLOC is tempting, but would change the location of // the look-ahead. YYLOC is available though. - YYLLOC_DEFAULT (yyloc, yyerror_range_ - 1, 2); + YYLLOC_DEFAULT (yyloc, yyerror_range - 1, 2); yysemantic_stack_.push (yylval); yylocation_stack_.push (yyloc); @@ -878,12 +786,12 @@ yyabortlab: goto yyreturn; yyreturn: - if (yylooka_ != yyeof_ && yylooka_ != yyempty_) - yydestruct_ ("Error: discarding lookahead", yyilooka_, &yylval, &yylloc); + if (yychar != yyeof_ && yychar != yyempty_) + yydestruct_ ("Cleanup: discarding lookahead", yytoken, &yylval, &yylloc); while (yystate_stack_.height () != 1) { - yydestruct_ ("Error: popping", + yydestruct_ ("Cleanup: popping", yystos_[yystate_stack_[0]], &yysemantic_stack_[0], &yylocation_stack_[0]); @@ -893,67 +801,52 @@ yyreturn: return yyresult_; } -void -yy::]b4_parser_class_name[::yylex_ () -{ - YYCDEBUG << "Reading a token: "; - yylooka_ = ]b4_c_function_call([yylex], [int], -[[YYSTYPE*], [&yylval]][]dnl -b4_location_if([, [[location*], [&yylloc]]])dnl -m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; -} - -// Generate an error message, and invoke error. -void -yy::]b4_parser_class_name[::yyreport_syntax_error_ () +// Generate an error message. +std::string +yy::]b4_parser_class_name[::yysyntax_error_ (YYERROR_VERBOSE_IF (int tok)) { - /* If not already recovering from an error, report this error. */ - if (!yyerrstatus_) - { - ++yynerrs_; - std::string message; + std::string res; #if YYERROR_VERBOSE - yyn_ = yypact_[yystate_]; - if (yypact_ninf_ < yyn_ && yyn_ < yylast_) - { - /* Start YYX at -YYN if negative to avoid negative indexes in - YYCHECK. */ - int yyxbegin = yyn_ < 0 ? -yyn_ : 0; - - /* Stay within bounds of both yycheck and yytname. */ - int yychecklim = yylast_ - yyn_; - int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_; - int count = 0; + yyn_ = yypact_[yystate_]; + if (yypact_ninf_ < yyn_ && yyn_ < yylast_) + { + /* Start YYX at -YYN if negative to avoid negative indexes in + YYCHECK. */ + int yyxbegin = yyn_ < 0 ? -yyn_ : 0; + + /* Stay within bounds of both yycheck and yytname. */ + int yychecklim = yylast_ - yyn_; + int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_; + int count = 0; + for (int x = yyxbegin; x < yyxend; ++x) + if (yycheck_[x + yyn_] == x && x != yyterror_) + ++count; + + // FIXME: This method of building the message is not compatible + // with internationalization. It should work like yacc.c does it. + // That is, first build a string that looks like this: + // "syntax error, unexpected %s or %s or %s" + // Then, invoke YY_ on this string. + // Finally, use the string as a format to output + // yytname_[tok], etc. + // Until this gets fixed, this message appears in English only. + res = "syntax error, unexpected "; + res += yytnamerr_ (yytname_[tok]); + if (count < 5) + { + count = 0; for (int x = yyxbegin; x < yyxend; ++x) if (yycheck_[x + yyn_] == x && x != yyterror_) - ++count; - - // FIXME: This method of building the message is not compatible - // with internationalization. It should work like yacc.c does it. - // That is, first build a string that looks like this: - // "syntax error, unexpected %s or %s or %s" - // Then, invoke YY_ on this string. - // Finally, use the string as a format to output - // yytname_[yyilooka_], etc. - // Until this gets fixed, this message appears in English only. - message = "syntax error, unexpected "; - message += yytnamerr_ (yytname_[yyilooka_]); - if (count < 5) - { - count = 0; - for (int x = yyxbegin; x < yyxend; ++x) - if (yycheck_[x + yyn_] == x && x != yyterror_) - { - message += (!count++) ? ", expecting " : " or "; - message += yytnamerr_ (yytname_[x]); - } - } - } - else -#endif - message = YY_("syntax error"); - error (yylloc, message); + { + res += (!count++) ? ", expecting " : " or "; + res += yytnamerr_ (yytname_[x]); + } + } } + else +#endif + res = YY_("syntax error"); + return res; }