X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/1d6b689b26f1939a31d082e94ce31d0a5e14853c..9b5049bd074ec26af9e216fd95eb8d618e3601a4:/data/lalr1.cc diff --git a/data/lalr1.cc b/data/lalr1.cc index 13a7e990..deab8639 100644 --- a/data/lalr1.cc +++ b/data/lalr1.cc @@ -1,7 +1,6 @@ # C++ skeleton for Bison -# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 -# Free Software Foundation, Inc. +# Copyright (C) 2002-2010 Free Software Foundation, Inc. # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by @@ -29,7 +28,7 @@ m4_define([b4_integral_parser_table_declare], ]) # b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT) -# --------------------------------------------- +# ------------------------------------------------------------- # Define "parser::yy_" which contents is CONTENT. m4_define([b4_integral_parser_table_define], [ const b4_int_type_for([$2]) @@ -47,18 +46,6 @@ m4_define([b4_integral_parser_table_define], m4_copy([b4_symbol_value], [b4_symbol_value_template]) -# b4_lex_symbol_if([IF-YYLEX-RETURNS-A-COMPLETE-SYMBOL], [IF-NOT]) -# ---------------------------------------------------------------- -m4_define([b4_lex_symbol_if], -[b4_percent_define_ifdef([[lex_symbol]], [$1], [$2])]) - - -# b4_assert_if([IF-ASSERTIONS-ARE-USED], [IF-NOT]) -# ------------------------------------------------ -m4_define([b4_assert_if], -[b4_percent_define_ifdef([[assert]], [$1], [$2])]) - - # b4_lhs_value([TYPE]) # -------------------- # Expansion of $$. @@ -126,92 +113,9 @@ m4_popdef([b4_at_dollar])dnl m4_popdef([b4_dollar_dollar])dnl ])]) -# b4_symbol_constructor_declaration_(SYMBOL-NUMBER) -# ------------------------------------------------- -# Declare the overloaded version of make_symbol for the (common) type of -# these SYMBOL-NUMBERS. Use at class-level. -m4_define([b4_symbol_constructor_declaration_], -[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id], -[ static inline - symbol_type - make_[]b4_symbol_([$1], [id]) (dnl -b4_args(b4_symbol_if([$1], [has_type], - [const b4_symbol([$1], [type])& v]), - b4_locations_if([const location_type& l]))); - -])])]) - - -# b4_symbol_constructor_declarations -# ---------------------------------- -# Declare symbol constructors for all the value types. -# Use at class-level. -m4_define([b4_symbol_constructor_declarations], -[b4_variant_if([ - // Symbol constructors declarations. -b4_symbol_foreach([b4_symbol_constructor_declaration_])])]) - - - -# b4_symbol_constructor_definition_(SYMBOL-NUMBER) -# ------------------------------------------------ -# Define symbol constructor for this SYMBOL-NUMBER. -m4_define([b4_symbol_constructor_definition_], -[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id], -[ b4_parser_class_name::symbol_type - b4_parser_class_name::make_[]b4_symbol_([$1], [id]) (dnl -b4_args(b4_symbol_if([$1], [has_type], - [const b4_symbol([$1], [type])& v]), - b4_locations_if([const location_type& l]))) - { - return symbol_type (b4_args([yytranslate_ (token::b4_symbol([$1], [id]))], - b4_symbol_if([$1], [has_type], [v]), - b4_locations_if([l]))); - } - -])])]) - - -# b4_symbol_constructor_definitions -# ---------------------------------- -# Define the overloaded versions of make_symbol for all the value types. -m4_define([b4_symbol_constructor_definitions], -[b4_variant_if([ - // Implementation of make_symbol for each symbol type. -b4_symbol_foreach([b4_symbol_constructor_definition_])])]) - - -# b4_yytranslate_definition -# ------------------------- -# Define yytranslate_. Sometimes we want it in the header file, -# sometimes the cc file suffices. -m4_define([b4_yytranslate_definition], -[[ // Symbol number corresponding to token number t. - ]b4_parser_class_name[::token_number_type - ]b4_parser_class_name[::yytranslate_ (]b4_lex_symbol_if([token_type], - [int])[ t) - { - static - const token_number_type - translate_table[] = - { -]b4_translate[ - }; - const unsigned int user_token_number_max_ = ]b4_user_token_number_max[; - const token_number_type undef_token_ = ]b4_undef_token_number[; - - if (static_cast(t) <= yyeof_) - return yyeof_; - else if (static_cast (t) <= user_token_number_max_) - return translate_table[t]; - else - return undef_token_; - } -]]) - m4_pushdef([b4_copyright_years], - [2002, 2003, 2004, 2005, 2006, 2007, 2008]) + [2002-2010]) m4_define([b4_parser_class_name], [b4_percent_define_get([[parser_class_name]])]) @@ -241,22 +145,20 @@ dnl FIXME: This is wrong, we want computed header guards. ]b4_percent_code_get([[requires]])[ -]b4_assert_if([#include ])[ +]b4_parse_assert_if([#include ])[ +#include #include #include +]b4_locations_if([#include "location.hh"])[ #include "stack.hh" ]b4_namespace_open[ -]b4_locations_if([ class position; - class location;])[ -]b4_variant_if([b4_variant_definition])[ +]b4_variant_if([b4_variant_define])[ ]b4_namespace_close[ -]b4_locations_if([#include "location.hh"])[ - /* Enabling traces. */ #ifndef YYDEBUG -# define YYDEBUG ]b4_debug_flag[ +# define YYDEBUG ]b4_parse_trace_if([1], [0])[ #endif /* Enabling verbose error messages. */ @@ -264,7 +166,7 @@ dnl FIXME: This is wrong, we want computed header guards. # undef YYERROR_VERBOSE # define YYERROR_VERBOSE 1 #else -# define YYERROR_VERBOSE ]b4_error_verbose_flag[ +# define YYERROR_VERBOSE ]b4_error_verbose_if([1], [0])[ #endif /* Enabling the token table. */ @@ -299,7 +201,6 @@ do { \ { public: ]b4_public_types_declare[ -]b4_symbol_constructor_declarations[ /// Build a parser object. ]b4_parser_class_name[ (]b4_parse_param_decl[); virtual ~]b4_parser_class_name[ (); @@ -328,14 +229,27 @@ do { \ virtual void error (]b4_locations_if([const location_type& loc, ])[const std::string& msg); private: - /// Generate an error message. - /// \param state the state where the error occurred. - /// \param tok the lookahead token. - virtual std::string yysyntax_error_ (int yystate, int tok); - /// State numbers. typedef int state_type; + /// Generate an error message. + /// \param yystate the state where the error occurred. + /// \param yytoken the lookahead token. + virtual std::string yysyntax_error_ (state_type yystate, int yytoken); + + /// Compute post-reduction state. + /// \param yystate the current state + /// \param yylhs the nonterminal to push on the stack + state_type yy_lr_goto_state_ (state_type yystate, int yylhs); + + /// Whether the given \c yypact_ value indicates a defaulted state. + /// \param yyvalue the value to check + static bool yy_pact_value_is_default_ (int yyvalue); + + /// Whether the given \c yytable_ value indicates a syntax error. + /// \param yyvalue the value to check + static bool yy_table_value_is_error_ (int yyvalue); + /// Internal symbol numbers. typedef ]b4_int_type_for([b4_translate])[ token_number_type; static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_; @@ -403,7 +317,7 @@ do { \ /// The state. state_type state; - /// Return the type corresponding to this state. + /// The type (corresponding to \a state). inline int type_get_ () const; }; @@ -447,9 +361,8 @@ do { \ ]b4_parse_param_vars[ }; -]b4_lex_symbol_if([b4_yytranslate_definition -b4_public_types_define -b4_symbol_constructor_definitions])[ +]b4_lex_symbol_if([b4_yytranslate_define +b4_public_types_define])[ ]b4_namespace_close[ ]b4_percent_define_flag_if([[global_tokens_and_yystype]], @@ -481,7 +394,7 @@ m4_if(b4_prefix, [yy], [], b4_percent_code_get[]dnl [#ifndef YY_ -# if YYENABLE_NLS +# if defined YYENABLE_NLS && YYENABLE_NLS # if ENABLE_NLS # include /* FIXME: INFRINGES ON USER NAME SPACE */ # define YY_(msgid) dgettext ("bison-runtime", msgid) @@ -599,8 +512,7 @@ b4_percent_code_get[]dnl | Symbol types. | `---------------*/ -]b4_lex_symbol_if([], [b4_public_types_define -b4_symbol_constructor_definitions])[ +]b4_lex_symbol_if([], [b4_public_types_define])[ // stack_symbol_type. ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type () @@ -734,6 +646,28 @@ b4_symbol_constructor_definitions])[ } #endif + inline ]b4_parser_class_name[::state_type + ]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yylhs) + { + int yyr = yypgoto_[yylhs - yyntokens_] + yystate; + if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate) + return yytable_[yyr]; + else + return yydefgoto_[yylhs - yyntokens_]; + } + + inline bool + ]b4_parser_class_name[::yy_pact_value_is_default_ (int yyvalue) + { + return yyvalue == yypact_ninf_; + } + + inline bool + ]b4_parser_class_name[::yy_table_value_is_error_ (int yyvalue) + { + return yyvalue == yytable_ninf_; + } + int ]b4_parser_class_name[::parse () { @@ -743,7 +677,6 @@ b4_symbol_constructor_definitions])[ /* State. */ int yyn; int yylen = 0; - int yystate = 0; /* Error handling. */ int yynerrs_ = 0; @@ -753,7 +686,7 @@ b4_symbol_constructor_definitions])[ symbol_type yyla;]b4_locations_if([[ /// The locations where the error started and ended. - stack_symbol_type yyerror_range[2];]])[ + stack_symbol_type yyerror_range[3];]])[ /// $$ and @@$. stack_symbol_type yylhs; @@ -778,14 +711,12 @@ m4_popdef([b4_at_dollar])])dnl yystack_ = stack_type (0); yypush_ (0, 0, yyla); - // A new state was pushed on the stack. - // Invariant: yystate == yystack_[0].state, i.e., - // yystate was just pushed onto the state stack. + // A new symbol was pushed on the stack. yynewstate: - YYCDEBUG << "Entering state " << yystate << std::endl; + YYCDEBUG << "Entering state " << yystack_[0].state << std::endl; /* Accept? */ - if (yystate == yyfinal_) + if (yystack_[0].state == yyfinal_) goto yyacceptlab; goto yybackup; @@ -794,8 +725,8 @@ m4_popdef([b4_at_dollar])])dnl yybackup: /* Try to take a decision without lookahead. */ - yyn = yypact_[yystate]; - if (yyn == yypact_ninf_) + yyn = yypact_[yystack_[0].state]; + if (yy_pact_value_is_default_ (yyn)) goto yydefault; /* Read a lookahead token. */ @@ -823,7 +754,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ yyn = yytable_[yyn]; if (yyn <= 0) { - if (yyn == 0 || yyn == yytable_ninf_) + if (yy_table_value_is_error_ (yyn)) goto yyerrlab; yyn = -yyn; goto yyreduce; @@ -838,15 +769,14 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ --yyerrstatus_; /* Shift the lookahead token. */ - yystate = yyn; - yypush_ ("Shifting", yystate, yyla); + yypush_ ("Shifting", yyn, yyla); goto yynewstate; /*-----------------------------------------------------------. | yydefault -- do the default action for the current state. | `-----------------------------------------------------------*/ yydefault: - yyn = yydefact_[yystate]; + yyn = yydefact_[yystack_[0].state]; if (yyn == 0) goto yyerrlab; goto yyreduce; @@ -855,11 +785,12 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ | yyreduce -- Do a reduction. | `-----------------------------*/ yyreduce: - yylen = yyr2_[yyn];]b4_variant_if([ + yylen = yyr2_[yyn]; + yylhs.state = yy_lr_goto_state_(yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([ /* Variants are always initialized to an empty instance of the correct type. The default $$=$1 action is NOT applied when using variants. */ - ]b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build]),[ + b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])],[ /* If YYLEN is nonzero, implement the default value of the action: `$$ = $1'. Otherwise, use the top of the stack. @@ -880,21 +811,21 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ // Perform the reduction. YY_REDUCE_PRINT (yyn); - switch (yyn) + try + { + switch (yyn) { ]b4_user_actions[ default: break; } - // Compute post-reduction state. - yyn = yyr1_[yyn]; - yystate = yypgoto_[yyn - yyntokens_] + yystack_[yylen].state; - if (0 <= yystate && yystate <= yylast_ - && yycheck_[yystate] == yystack_[yylen].state) - yystate = yytable_[yystate]; - else - yystate = yydefgoto_[yyn - yyntokens_]; - yylhs.state = yystate; + } + catch (const syntax_error& yyexc) + { + error (]b4_args(b4_locations_if([yyexc.location]), + [[yyexc.what()]])[); + YYERROR; + } YY_SYMBOL_PRINT ("-> $$ =", yylhs); ]b4_variant_if([[ // Destroy the rhs symbols. @@ -928,11 +859,11 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ { ++yynerrs_; error (]b4_args(b4_locations_if([yyla.location]), - [yysyntax_error_ (yystate, yyla.type)])[); + [[yysyntax_error_ (yystack_[0].state, yyla.type)]])[); } ]b4_locations_if([[ - yyerror_range[0].location = yyla.location;]])[ + yyerror_range[1].location = yyla.location;]])[ if (yyerrstatus_ == 3) { /* If just tried and failed to reuse lookahead token after an @@ -941,7 +872,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ /* Return failure if at end of input. */ if (yyla.type == yyeof_) YYABORT; - else + else if (!yyempty) { yy_destroy_ ("Error: discarding", yyla); yyempty = true; @@ -962,15 +893,14 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ YYERROR and the label yyerrorlab therefore never appears in user code. */ if (false) - goto yyerrorlab; - -]b4_locations_if([[ - yyerror_range[0].location = yystack_[yylen - 1].location;]])[ + goto yyerrorlab;]b4_locations_if([[ + yyerror_range[1].location = yystack_[yylen - 1].location;]])b4_variant_if([[ + /* $$ was initialized before running the user action. */ + yy_destroy_ ("Error: discarding", yylhs);]])[ /* Do not reclaim the symbols of the rule which action triggered this YYERROR. */ yypop_ (yylen); yylen = 0; - yystate = yystack_[0].state; goto yyerrlab1; /*-------------------------------------------------------------. @@ -982,8 +912,8 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ stack_symbol_type error_token; for (;;) { - yyn = yypact_[yystate]; - if (yyn != yypact_ninf_) + yyn = yypact_[yystack_[0].state]; + if (!yy_pact_value_is_default_ (yyn)) { yyn += yyterror_; if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_) @@ -998,18 +928,17 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ if (yystack_.size () == 1) YYABORT; ]b4_locations_if([[ - yyerror_range[0].location = yystack_[0].location;]])[ + yyerror_range[1].location = yystack_[0].location;]])[ yy_destroy_ ("Error: popping", yystack_[0]); yypop_ (); - yystate = yystack_[0].state; YY_STACK_PRINT (); } ]b4_locations_if([[ - yyerror_range[1].location = yyla.location; - YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);]])[ + yyerror_range[2].location = yyla.location; + YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);]])[ /* Shift the error token. */ - error_token.state = yystate = yyn; + error_token.state = yyn; yypush_ ("Shifting", error_token); } goto yynewstate; @@ -1043,7 +972,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ // Generate an error message. std::string ]b4_parser_class_name[::yysyntax_error_ (]dnl -b4_error_verbose_if([int yystate, int yytoken], +b4_error_verbose_if([state_type yystate, int yytoken], [int, int])[) { std::string yyres;]b4_error_verbose_if([[ @@ -1051,7 +980,8 @@ b4_error_verbose_if([int yystate, int yytoken], if (yypact_ninf_ < yyn && yyn <= yylast_) { /* Start YYX at -YYN if negative to avoid negative indexes in - YYCHECK. */ + YYCHECK. In other words, skip the first -YYN actions for this + state because they are default actions. */ int yyxbegin = yyn < 0 ? -yyn : 0; /* Stay within bounds of both yycheck and yytname. */ @@ -1067,7 +997,8 @@ b4_error_verbose_if([int yystate, int yytoken], char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM]; yyarg[yycount++] = yytname_[yytoken]; for (int yyx = yyxbegin; yyx < yyxend; ++yyx) - if (yycheck_[yyx + yyn] == yyx && yyx != yyterror_) + if (yycheck_[yyx + yyn] == yyx && yyx != yyterror_ + && !yy_table_value_is_error_ (yytable_[yyx + yyn])) { if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM) { @@ -1158,7 +1089,7 @@ b4_error_verbose_if([int yystate, int yytoken], } #endif // YYDEBUG -]b4_lex_symbol_if([], [b4_yytranslate_definition])[ +]b4_lex_symbol_if([], [b4_yytranslate_define])[ ]b4_namespace_close[ ]b4_epilogue[]dnl m4_divert_pop(0)