X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/77a1a208a9ff9110f28a958c3fb630b434976e1a..952416114729b95209dccfc4edacfc1ff13b4e82:/data/lalr1.cc diff --git a/data/lalr1.cc b/data/lalr1.cc index 75eaf571..3773257c 100644 --- a/data/lalr1.cc +++ b/data/lalr1.cc @@ -1,6 +1,6 @@ # C++ skeleton for Bison -# Copyright (C) 2002-2012 Free Software Foundation, Inc. +# Copyright (C) 2002-2015 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 @@ -17,10 +17,12 @@ m4_include(b4_pkgdatadir/[c++.m4]) +# api.value.type=variant is valid. +m4_define([b4_value_type_setup_variant]) # b4_integral_parser_table_declare(TABLE-NAME, CONTENT, COMMENT) # -------------------------------------------------------------- -# Declare "parser::yy_" which contents is CONTENT. +# Declare "parser::yy_" whose contents is CONTENT. m4_define([b4_integral_parser_table_declare], [m4_ifval([$3], [b4_comment([$3], [ ]) ])dnl @@ -29,7 +31,7 @@ m4_define([b4_integral_parser_table_declare], # b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT) # ------------------------------------------------------------- -# Define "parser::yy_" which contents is CONTENT. +# Define "parser::yy_" whose contents is CONTENT. m4_define([b4_integral_parser_table_define], [ const b4_int_type_for([$2]) b4_parser_class_name::yy$1_[[]] = @@ -38,13 +40,14 @@ m4_define([b4_integral_parser_table_define], };dnl ]) - # b4_symbol_value_template(VAL, [TYPE]) # ------------------------------------- # Same as b4_symbol_value, but used in a template method. It makes -# a difference when using variants. +# a difference when using variants. Note that b4_value_type_setup_union +# overrides b4_symbol_value, so we must override it again. m4_copy([b4_symbol_value], [b4_symbol_value_template]) - +m4_append([b4_value_type_setup_union], + [m4_copy_force([b4_symbol_value_union], [b4_symbol_value_template])]) # b4_lhs_value([TYPE]) # -------------------- @@ -114,16 +117,28 @@ b4_dollar_popdef[]dnl ])]) +# b4_lex +# ------ +# Call yylex. +m4_define([b4_lex], +[b4_token_ctor_if( +[b4_function_call([yylex], + [symbol_type], m4_ifdef([b4_lex_param], b4_lex_param))], +[b4_function_call([yylex], [int], + [b4_api_PREFIX[STYPE*], [&yyla.value]][]dnl +b4_locations_if([, [[location*], [&yyla.location]]])dnl +m4_ifdef([b4_lex_param], [, ]b4_lex_param))])]) + + m4_pushdef([b4_copyright_years], - [2002-2012]) + [2002-2015]) m4_define([b4_parser_class_name], [b4_percent_define_get([[parser_class_name]])]) -b4_locations_if([b4_percent_define_ifdef([[location_type]], [], - [# Backward compatibility. +b4_bison_locations_if([# Backward compatibility. m4_define([b4_location_constructors]) - m4_include(b4_pkgdatadir/[location.cc])])]) + m4_include(b4_pkgdatadir/[location.cc])]) m4_include(b4_pkgdatadir/[stack.hh]) b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])]) @@ -134,23 +149,24 @@ b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])]) m4_define([b4_shared_declarations], [b4_percent_code_get([[requires]])[ ]b4_parse_assert_if([# include ])[ -# include +# include // std::abort # include # include -# include ]b4_defines_if([[ +# include +# include ]b4_defines_if([[ # include "stack.hh" -]b4_locations_if([b4_percent_define_ifdef([[location_type]], [], - [[# include "location.hh"]])])])[ +]b4_bison_locations_if([[# include "location.hh"]])])[ +]b4_variant_if([b4_variant_includes])[ +]b4_attribute_define[ ]b4_YYDEBUG_define[ ]b4_namespace_open[ ]b4_defines_if([], [b4_stack_define -b4_locations_if([b4_percent_define_ifdef([[location_type]], [], - [b4_position_define -b4_location_define])])])[ +b4_bison_locations_if([b4_position_define +b4_location_define])])[ ]b4_variant_if([b4_variant_define])[ @@ -169,14 +185,14 @@ b4_location_define])])])[ #if ]b4_api_PREFIX[DEBUG /// The current debugging stream. - std::ostream& debug_stream () const; + std::ostream& debug_stream () const YY_ATTRIBUTE_PURE; /// Set the current debugging stream. void set_debug_stream (std::ostream &); /// Type for debugging levels. typedef int debug_level_type; /// The current debugging level. - debug_level_type debug_level () const; + debug_level_type debug_level () const YY_ATTRIBUTE_PURE; /// Set the current debugging level. void set_debug_level (debug_level_type l); #endif @@ -190,18 +206,23 @@ b4_location_define])])])[ void error (const syntax_error& err); private: + /// This class is not copyable. + ]b4_parser_class_name[ (const ]b4_parser_class_name[&); + ]b4_parser_class_name[& operator= (const ]b4_parser_class_name[&); + /// 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); + /// \param yyla the lookahead token. + virtual std::string yysyntax_error_ (state_type yystate, + const symbol_type& yyla) const; /// 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); + /// \param yysym the nonterminal to push on the stack + state_type yy_lr_goto_state_ (state_type yystate, int yysym); /// Whether the given \c yypact_ value indicates a defaulted state. /// \param yyvalue the value to check @@ -211,11 +232,12 @@ b4_location_define])])])[ /// \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_; static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ yytable_ninf_; + /// Convert a scanner token number \a t to a symbol number. + static token_number_type yytranslate_ (]b4_token_ctor_if([token_type], [int])[ t); + // Tables. ]b4_parser_tables_declare[]b4_error_verbose_if([ @@ -227,7 +249,7 @@ b4_location_define])])])[ static const char* const yytname_[]; ]b4_token_table_if([[#if ]b4_api_PREFIX[DEBUG]])[ ]b4_integral_parser_table_declare([rline], [b4_rline], - [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[ + [[YYRLINE[YYN] -- Source line where rule number YYN was defined.]])[ /// Report on the debug stream that the rule \a r is going to be reduced. virtual void yy_reduce_print_ (int r); /// Print the state stack on the debug stream. @@ -236,48 +258,66 @@ b4_location_define])])])[ // Debugging. int yydebug_; std::ostream* yycdebug_; -#endif // ]b4_api_PREFIX[DEBUG - - /// Convert a scanner token number \a t to a symbol number. - static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t); -#if ]b4_api_PREFIX[DEBUG /// \brief Display a symbol type, value and location. /// \param yyo The output stream. /// \param yysym The symbol. - template - void yy_print_ (std::ostream& yyo, - const symbol_base_type& yysym) const; + template + void yy_print_ (std::ostream& yyo, const basic_symbol& yysym) const; #endif /// \brief Reclaim the memory associated to a symbol. /// \param yymsg Why this token is reclaimed. /// If null, print nothing. - /// \param s The symbol. - template - inline void yy_destroy_ (const char* yymsg, - symbol_base_type& yysym) const; + /// \param yysym The symbol. + template + void yy_destroy_ (const char* yymsg, basic_symbol& yysym) const; private: - /// Element of the stack: a state and its attributes. - struct stack_symbol_type : symbol_base_type + /// Type access provider for state based symbols. + struct by_state { - /// The parent class. - typedef symbol_base_type super_type; - /// Default constructor. - inline stack_symbol_type (); + by_state (); + + /// The symbol type as needed by the constructor. + typedef state_type kind_type; /// Constructor. - inline stack_symbol_type (]b4_join([state_type s], - [const semantic_type& v], - b4_locations_if([const location_type& l]))[); + by_state (kind_type s); + + /// Copy constructor. + by_state (const by_state& other); + + /// Record that this symbol is empty. + void clear (); + + /// Steal the symbol type from \a that. + void move (by_state& that); + + /// The (internal) type number (corresponding to \a state). + /// \a empty_symbol when empty. + symbol_number_type type_get () const; + + /// The state number used to denote an empty symbol. + enum { empty_state = -1 }; /// The state. + /// \a empty when empty. state_type state; + }; - /// The type (corresponding to \a state). - inline int type_get_ () const; + /// "Internal" symbol: element of the stack. + struct stack_symbol_type : basic_symbol + { + /// Superclass. + typedef basic_symbol super_type; + /// Construct an empty symbol. + stack_symbol_type (); + /// Steal the contents from \a sym to build this. + stack_symbol_type (state_type s, symbol_type& sym); + /// Assignment, needed by push_back. + stack_symbol_type& operator= (const stack_symbol_type& that); }; /// Stack type. @@ -291,7 +331,7 @@ b4_location_define])])])[ /// if null, no trace is output. /// \param s the symbol /// \warning the contents of \a s.value is stolen. - inline void yypush_ (const char* m, stack_symbol_type& s); + void yypush_ (const char* m, stack_symbol_type& s); /// Push a new look ahead token on the state on the stack. /// \param m a debug message to display @@ -299,28 +339,27 @@ b4_location_define])])])[ /// \param s the state /// \param sym the symbol (for its value and location). /// \warning the contents of \a s.value is stolen. - inline void yypush_ (const char* m, state_type s, symbol_type& sym); + void yypush_ (const char* m, state_type s, symbol_type& sym); /// Pop \a n symbols the three stacks. - inline void yypop_ (unsigned int n = 1); + void yypop_ (unsigned int n = 1); - /* Constants. */ + /// Constants. enum { yyeof_ = 0, - yylast_ = ]b4_last[, //< Last index in yytable_. - yynnts_ = ]b4_nterms_number[, //< Number of nonterminal symbols. - yyempty_ = -2, - yyfinal_ = ]b4_final_state_number[, //< Termination state number. + yylast_ = ]b4_last[, ///< Last index in yytable_. + yynnts_ = ]b4_nterms_number[, ///< Number of nonterminal symbols. + yyfinal_ = ]b4_final_state_number[, ///< Termination state number. yyterror_ = 1, yyerrcode_ = 256, - yyntokens_ = ]b4_tokens_number[ //< Number of tokens. + yyntokens_ = ]b4_tokens_number[ ///< Number of tokens. }; ]b4_parse_param_vars[ }; -]b4_lex_symbol_if([b4_yytranslate_define +]b4_token_ctor_if([b4_yytranslate_define b4_public_types_define])[ ]b4_namespace_close[ @@ -328,18 +367,15 @@ b4_public_types_define])[ [b4_token_defines #ifndef ]b4_api_PREFIX[STYPE - /* Redirection for backward compatibility. */ + // Redirection for backward compatibility. # define ]b4_api_PREFIX[STYPE b4_namespace_ref::b4_parser_class_name::semantic_type #endif ])[ ]b4_percent_code_get([[provides]])[ ]]) -# We do want M4 expansion after # for CPP macros. -m4_changecom() b4_defines_if( -[m4_divert_push(0)dnl -@output(b4_spec_defines_file@)@ +[b4_output_begin([b4_spec_defines_file]) b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++]) [ /** @@ -347,17 +383,16 @@ b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++]) ** Define the ]b4_namespace_ref[::parser class. */ -/* C++ LALR(1) parser skeleton written by Akim Demaille. */ +// C++ LALR(1) parser skeleton written by Akim Demaille. ]b4_cpp_guard_open([b4_spec_defines_file])[ ]b4_shared_declarations[ ]b4_cpp_guard_close([b4_spec_defines_file]) -m4_divert_pop(0)dnl +b4_output_end() ]) -m4_divert_push(0)dnl -@output(b4_parser_file_name@)@ +b4_output_begin([b4_parser_file_name]) b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++]) b4_percent_code_get([[top]])[]dnl m4_if(b4_prefix, [yy], [], @@ -373,14 +408,14 @@ m4_if(b4_prefix, [yy], [], ]b4_defines_if([[#include "@basename(]b4_spec_defines_file[@)"]], [b4_shared_declarations])[ -/* User implementation prologue. */ +// User implementation prologue. ]b4_user_post_prologue[ ]b4_percent_code_get[ #ifndef YY_ # if defined YYENABLE_NLS && YYENABLE_NLS # if ENABLE_NLS -# include /* FIXME: INFRINGES ON USER NAME SPACE */ +# include // FIXME: INFRINGES ON USER NAME SPACE. # define YY_(msgid) dgettext ("bison-runtime", msgid) # endif # endif @@ -393,13 +428,13 @@ m4_if(b4_prefix, [yy], [], [#define YYRHSLOC(Rhs, K) ((Rhs)[K].location) ]b4_yylloc_default_define])[ -/* Suppress unused-variable warnings by "using" E. */ -#define YYUSE(e) ((void) (e)) +// Suppress unused-variable warnings by "using" E. +#define YYUSE(E) ((void) (E)) -/* Enable debugging if requested. */ +// Enable debugging if requested. #if ]b4_api_PREFIX[DEBUG -/* A pseudo ostream that takes yydebug_ into account. */ +// A pseudo ostream that takes yydebug_ into account. # define YYCDEBUG if (yydebug_) (*yycdebug_) # define YY_SYMBOL_PRINT(Title, Symbol) \ @@ -424,17 +459,17 @@ m4_if(b4_prefix, [yy], [], yystack_print_ (); \ } while (false) -#else /* !]b4_api_PREFIX[DEBUG */ +#else // !]b4_api_PREFIX[DEBUG # define YYCDEBUG if (false) std::cerr # define YY_SYMBOL_PRINT(Title, Symbol) YYUSE(Symbol) # define YY_REDUCE_PRINT(Rule) static_cast(0) # define YY_STACK_PRINT() static_cast(0) -#endif /* !]b4_api_PREFIX[DEBUG */ +#endif // !]b4_api_PREFIX[DEBUG #define yyerrok (yyerrstatus_ = 0) -#define yyclearin (yyempty = true) +#define yyclearin (yyla.clear ()) #define YYACCEPT goto yyacceptlab #define YYABORT goto yyabortlab @@ -466,7 +501,7 @@ m4_if(b4_prefix, [yy], [], case '\\': if (*++yyp != '\\') goto do_not_strip_quotes; - /* Fall through. */ + // Fall through. default: yyr += *yyp; break; @@ -488,120 +523,139 @@ m4_if(b4_prefix, [yy], [], ]m4_ifset([b4_parse_param], [ ], [ :])[yydebug_ (false), yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[ #endif]b4_parse_param_cons[ - { - } + {} ]b4_parser_class_name::~b4_parser_class_name[ () - { - } + {} /*---------------. | Symbol types. | `---------------*/ -]b4_lex_symbol_if([], [b4_public_types_define])[ +]b4_token_ctor_if([], [b4_public_types_define])[ - // stack_symbol_type. - ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type () - : super_type () - , state () + // by_state. + inline + ]b4_parser_class_name[::by_state::by_state () + : state (empty_state) + {} + + inline + ]b4_parser_class_name[::by_state::by_state (const by_state& other) + : state (other.state) + {} + + inline + void + ]b4_parser_class_name[::by_state::clear () { + state = empty_state; } - ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (]b4_join( - [state_type s], - [const semantic_type& v], - b4_locations_if([const location_type& l]))[) - : super_type (v]b4_locations_if([, l])[) - , state (s) + inline + void + ]b4_parser_class_name[::by_state::move (by_state& that) { + state = that.state; + that.clear (); } - int - ]b4_parser_class_name[::stack_symbol_type::type_get_ () const + inline + ]b4_parser_class_name[::by_state::by_state (state_type s) + : state (s) + {} + + inline + ]b4_parser_class_name[::symbol_number_type + ]b4_parser_class_name[::by_state::type_get () const + { + if (state == empty_state) + return empty_symbol; + else + return yystos_[state]; + } + + inline + ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type () + {} + + + inline + ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (state_type s, symbol_type& that) + : super_type (s]b4_locations_if([, that.location])[) { - return yystos_[state]; + ]b4_variant_if([b4_symbol_variant([that.type_get ()], + [value], [move], [that.value])], + [[value = that.value;]])[ + // that is emptied. + that.type = empty_symbol; + } + + inline + ]b4_parser_class_name[::stack_symbol_type& + ]b4_parser_class_name[::stack_symbol_type::operator= (const stack_symbol_type& that) + { + state = that.state; + ]b4_variant_if([b4_symbol_variant([that.type_get ()], + [value], [copy], [that.value])], + [[value = that.value;]])[]b4_locations_if([ + location = that.location;])[ + return *this; } - template + template + inline void - ]b4_parser_class_name[::yy_destroy_ (const char* yymsg, - symbol_base_type& yysym) const + ]b4_parser_class_name[::yy_destroy_ (const char* yymsg, basic_symbol& yysym) const { if (yymsg) - YY_SYMBOL_PRINT (yymsg, yysym); + YY_SYMBOL_PRINT (yymsg, yysym);]b4_variant_if([], [ // User destructor. - int yytype = yysym.type_get (); - switch (yytype) - { -]b4_symbol_foreach([b4_symbol_destructor])dnl -[ default: - break; - }]b4_variant_if([ - - // Type destructor. - b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[ + b4_symbol_actions([destructor], [yysym.type_get ()])])[ } #if ]b4_api_PREFIX[DEBUG - template + template void ]b4_parser_class_name[::yy_print_ (std::ostream& yyo, - const symbol_base_type& yysym) const + const basic_symbol& yysym) const { std::ostream& yyoutput = yyo; YYUSE (yyoutput); - int yytype = yysym.type_get (); + symbol_number_type yytype = yysym.type_get (); + // Avoid a (spurious) G++ 4.8 warning about "array subscript is + // below array bounds". + if (yysym.empty ()) + std::abort (); yyo << (yytype < yyntokens_ ? "token" : "nterm") << ' ' << yytname_[yytype] << " ("]b4_locations_if([ << yysym.location << ": "])[; - switch (yytype) - { -]b4_symbol_foreach([b4_symbol_printer])dnl -[ default: - break; - } + ]b4_symbol_actions([printer])[ yyo << ')'; } #endif + inline void - ]b4_parser_class_name[::yypush_ (const char* m, state_type s, - symbol_type& sym) + ]b4_parser_class_name[::yypush_ (const char* m, state_type s, symbol_type& sym) { - if (m) - YY_SYMBOL_PRINT (m, sym); -]b4_variant_if( -[[ yystack_.push (stack_symbol_type (]b4_join( - [s], - [semantic_type()], - b4_locations_if([sym.location]))[)); - ]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]], - [build], [sym.value])], -[[ yystack_.push (stack_symbol_type (]b4_join( - [s], - [sym.value], - b4_locations_if([sym.location]))[));]])[ + stack_symbol_type t (s, sym); + yypush_ (m, t); } + inline void ]b4_parser_class_name[::yypush_ (const char* m, stack_symbol_type& s) { if (m) YY_SYMBOL_PRINT (m, s); -]b4_variant_if( -[[ yystack_.push (stack_symbol_type (]b4_join( - [s.state], - [semantic_type()], - b4_locations_if([s.location]))[)); - ]b4_symbol_variant([[yystos_[s.state]]], [[yystack_[0].value]], - [build], [s.value])], -[ yystack_.push (s);])[ + yystack_.push (s); } + inline void ]b4_parser_class_name[::yypop_ (unsigned int n) { @@ -636,13 +690,13 @@ m4_if(b4_prefix, [yy], [], #endif // ]b4_api_PREFIX[DEBUG inline ]b4_parser_class_name[::state_type - ]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yylhs) + ]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yysym) { - int yyr = yypgoto_[yylhs - yyntokens_] + yystate; + int yyr = yypgoto_[yysym - yyntokens_] + yystate; if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate) return yytable_[yyr]; else - return yydefgoto_[yylhs - yyntokens_]; + return yydefgoto_[yysym - yyntokens_]; } inline bool @@ -660,14 +714,12 @@ m4_if(b4_prefix, [yy], [], int ]b4_parser_class_name[::parse () { - /// Whether yyla contains a lookahead. - bool yyempty = true; - - /* State. */ + // State. int yyn; + /// Length of the RHS of the rule being reduced. int yylen = 0; - /* Error handling. */ + // Error handling. int yynerrs_ = 0; int yyerrstatus_ = 0; @@ -677,17 +729,18 @@ m4_if(b4_prefix, [yy], [], /// The locations where the error started and ended. stack_symbol_type yyerror_range[3];]])[ - /// $$ and @@$. - stack_symbol_type yylhs; - /// The return value of parse (). int yyresult; + // FIXME: This shoud be completely indented. It is not yet to + // avoid gratuitous conflicts when merging into the master branch. + try + { YYCDEBUG << "Starting parse" << std::endl; ]m4_ifdef([b4_initial_action], [ b4_dollar_pushdef([yyla.value], [], [yyla.location])dnl - /* User initialization code. */ + // User initialization code. b4_user_initial_action b4_dollar_popdef])[]dnl @@ -695,57 +748,52 @@ b4_dollar_popdef])[]dnl yynewstate, since the latter expects the semantical and the location values to have been already stored, initialize these stacks with a primary value. */ - yystack_ = stack_type (0); - yypush_ (YY_NULL, 0, yyla); + yystack_.clear (); + yypush_ (YY_NULLPTR, 0, yyla); // A new symbol was pushed on the stack. yynewstate: YYCDEBUG << "Entering state " << yystack_[0].state << std::endl; - /* Accept? */ + // Accept? if (yystack_[0].state == yyfinal_) goto yyacceptlab; goto yybackup; - /* Backup. */ + // Backup. yybackup: - /* Try to take a decision without lookahead. */ + // Try to take a decision without lookahead. yyn = yypact_[yystack_[0].state]; if (yy_pact_value_is_default_ (yyn)) goto yydefault; - /* Read a lookahead token. */ - if (yyempty) + // Read a lookahead token. + if (yyla.empty ()) { YYCDEBUG << "Reading a token: "; try - { -]b4_lex_symbol_if( -[ yyla = b4_function_call([yylex], [symbol_type], - m4_ifdef([b4_lex_param], b4_lex_param));], -[ yyla.type = yytranslate_ (b4_function_call([yylex], [int], - [b4_api_PREFIX[STYPE*], [&yyla.value]][]dnl -b4_locations_if([, [[location*], [&yyla.location]]])dnl -m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ + {]b4_token_ctor_if([[ + symbol_type yylookahead (]b4_lex[); + yyla.move (yylookahead);]], [[ + yyla.type = yytranslate_ (]b4_lex[);]])[ } catch (const syntax_error& yyexc) { error (yyexc); goto yyerrlab1; } - yyempty = false; } YY_SYMBOL_PRINT ("Next token is", yyla); /* If the proper action on seeing token YYLA.TYPE is to reduce or to detect an error, take that action. */ - yyn += yyla.type; - if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type) + yyn += yyla.type_get (); + if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type_get ()) goto yydefault; - /* Reduce or error. */ + // Reduce or error. yyn = yytable_[yyn]; if (yyn <= 0) { @@ -755,15 +803,11 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ goto yyreduce; } - /* Discard the token being shifted. */ - yyempty = true; - - /* Count tokens shifted since error; after three, turn off error - status. */ + // Count tokens shifted since error; after three, turn off error status. if (yyerrstatus_) --yyerrstatus_; - /* Shift the lookahead token. */ + // Shift the lookahead token. yypush_ ("Shifting", yyn, yyla); goto yynewstate; @@ -781,80 +825,67 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ `-----------------------------*/ yyreduce: 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])],[ - /* If YYLEN is nonzero, implement the default value of the action: - `$$ = $1'. Otherwise, use the top of the stack. - - Otherwise, the following line sets YYLHS.VALUE to garbage. - This behavior is undocumented and Bison - users should not rely upon it. */ - if (yylen) - yylhs.value = yystack_@{yylen - 1@}.value; - else - yylhs.value = yystack_@{0@}.value;])[ + { + stack_symbol_type yylhs; + yylhs.state = yy_lr_goto_state_(yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([ + /* Variants are always initialized to an empty instance of the + correct type. The default '$$ = $1' action is NOT applied + when using variants. */ + b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])], [ + /* If YYLEN is nonzero, implement the default value of the + action: '$$ = $1'. Otherwise, use the top of the stack. + + Otherwise, the following line sets YYLHS.VALUE to garbage. + This behavior is undocumented and Bison users should not rely + upon it. */ + if (yylen) + yylhs.value = yystack_@{yylen - 1@}.value; + else + yylhs.value = yystack_@{0@}.value;])[ ]b4_locations_if([dnl [ - // Compute the default @@$. - { - slice slice (yystack_, yylen); - YYLLOC_DEFAULT (yylhs.location, slice, yylen); - }]])[ - - // Perform the reduction. - YY_REDUCE_PRINT (yyn); - try + // Compute the default @@$. { - switch (yyn) - { -]b4_user_actions[ - default: - break; - } - } - catch (const syntax_error& yyexc) - { - error (yyexc); - YYERROR; - } - YY_SYMBOL_PRINT ("-> $$ =", yylhs); -]b4_variant_if([[ - // Destroy the rhs symbols. - for (int i = 0; i < yylen; ++i) - // Destroy a variant which value may have been swapped with - // yylhs.value (for instance if the action was "std::swap($$, - // $1)"). The value of yylhs.value (hence possibly one of these - // rhs symbols) depends on the default construction for this - // type. In the case of pointers for instance, no - // initialization is done, so the value is junk. Therefore do - // not try to report the value of symbols about to be destroyed - // in the debug trace, it's possibly junk. Hence yymsg = 0. - // Besides, that keeps exactly the same traces as with the other - // Bison skeletons. - yy_destroy_ (YY_NULL, yystack_[i]);]])[ + slice slice (yystack_, yylen); + YYLLOC_DEFAULT (yylhs.location, slice, yylen); + }]])[ - yypop_ (yylen); - yylen = 0; - YY_STACK_PRINT (); + // Perform the reduction. + YY_REDUCE_PRINT (yyn); + try + { + switch (yyn) + { +]b4_user_actions[ + default: + break; + } + } + catch (const syntax_error& yyexc) + { + error (yyexc); + YYERROR; + } + YY_SYMBOL_PRINT ("-> $$ =", yylhs); + yypop_ (yylen); + yylen = 0; + YY_STACK_PRINT (); - /* Shift the result of the reduction. */ - yypush_ (YY_NULL, yylhs); + // Shift the result of the reduction. + yypush_ (YY_NULLPTR, yylhs); + } goto yynewstate; /*--------------------------------------. | yyerrlab -- here on detecting error. | `--------------------------------------*/ yyerrlab: - /* If not already recovering from an error, report this error. */ + // If not already recovering from an error, report this error. if (!yyerrstatus_) { ++yynerrs_; error (]b4_join(b4_locations_if([yyla.location]), - [[yysyntax_error_ (yystack_[0].state, - yyempty ? yyempty_ : yyla.type)]])[); + [[yysyntax_error_ (yystack_[0].state, yyla)]])[); } ]b4_locations_if([[ @@ -864,18 +895,17 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ /* If just tried and failed to reuse lookahead token after an error, discard it. */ - /* Return failure if at end of input. */ - if (yyla.type == yyeof_) + // Return failure if at end of input. + if (yyla.type_get () == yyeof_) YYABORT; - else if (!yyempty) + else if (!yyla.empty ()) { yy_destroy_ ("Error: discarding", yyla); - yyempty = true; + yyla.clear (); } } - /* Else will try to reuse lookahead token after shifting the error - token. */ + // Else will try to reuse lookahead token after shifting the error token. goto yyerrlab1; @@ -889,10 +919,8 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ code. */ if (false) 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 + yyerror_range[1].location = yystack_[yylen - 1].location;]])[ + /* Do not reclaim the symbols of the rule whose action triggered this YYERROR. */ yypop_ (yylen); yylen = 0; @@ -902,7 +930,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ | yyerrlab1 -- common code for both syntax error and YYERROR. | `-------------------------------------------------------------*/ yyerrlab1: - yyerrstatus_ = 3; /* Each real token shifted decrements this. */ + yyerrstatus_ = 3; // Each real token shifted decrements this. { stack_symbol_type error_token; for (;;) @@ -932,30 +960,30 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ yyerror_range[2].location = yyla.location; YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);]])[ - /* Shift the error token. */ + // Shift the error token. error_token.state = yyn; yypush_ ("Shifting", error_token); } goto yynewstate; - /* Accept. */ + // Accept. yyacceptlab: yyresult = 0; goto yyreturn; - /* Abort. */ + // Abort. yyabortlab: yyresult = 1; goto yyreturn; yyreturn: - if (!yyempty) + if (!yyla.empty ()) yy_destroy_ ("Cleanup: discarding lookahead", yyla); - /* Do not reclaim the symbols of the rule which action triggered + /* Do not reclaim the symbols of the rule whose action triggered this YYABORT or YYACCEPT. */ yypop_ (yylen); - while (yystack_.size () != 1) + while (1 < yystack_.size ()) { yy_destroy_ ("Cleanup: popping", yystack_[0]); yypop_ (); @@ -963,6 +991,23 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ return yyresult; } + catch (...) + { + YYCDEBUG << "Exception caught: cleaning lookahead and stack" + << std::endl; + // Do not try to display the values of the reclaimed symbols, + // as their printer might throw an exception. + if (!yyla.empty ()) + yy_destroy_ (YY_NULLPTR, yyla); + + while (1 < yystack_.size ()) + { + yy_destroy_ (YY_NULLPTR, yystack_[0]); + yypop_ (); + } + throw; + } + } void ]b4_parser_class_name[::error (const syntax_error& yyexc) @@ -974,10 +1019,9 @@ 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([state_type yystate, int yytoken], - [int, int])[) +b4_error_verbose_if([state_type yystate, const symbol_type& yyla], + [state_type, const symbol_type&])[) const {]b4_error_verbose_if([[ - std::string yyres; // Number of reported tokens (one for the "unexpected", one per // "expected"). size_t yycount = 0; @@ -991,7 +1035,7 @@ b4_error_verbose_if([state_type yystate, int yytoken], the only way this function was invoked is if the default action is an error action. In that case, don't check for expected tokens because there are none. - - The only way there can be no lookahead present (in yytoken) is + - The only way there can be no lookahead present (in yyla) is if this state is a consistent state with a default action. Thus, detecting the absence of a lookahead is sufficient to determine that there is no unexpected or expected token to @@ -1011,8 +1055,9 @@ b4_error_verbose_if([state_type yystate, int yytoken], token that will not be accepted due to an error action in a later state. */ - if (yytoken != yyempty_) + if (!yyla.empty ()) { + int yytoken = yyla.type_get (); yyarg[yycount++] = yytname_[yytoken]; int yyn = yypact_[yystate]; if (!yy_pact_value_is_default_ (yyn)) @@ -1021,7 +1066,7 @@ b4_error_verbose_if([state_type yystate, int yytoken], 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. */ + // Stay within bounds of both yycheck and yytname. int yychecklim = yylast_ - yyn + 1; int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_; for (int yyx = yyxbegin; yyx < yyxend; ++yyx) @@ -1039,7 +1084,7 @@ b4_error_verbose_if([state_type yystate, int yytoken], } } - char const* yyformat = YY_NULL; + char const* yyformat = YY_NULLPTR; switch (yycount) { #define YYCASE_(N, S) \ @@ -1055,6 +1100,7 @@ b4_error_verbose_if([state_type yystate, int yytoken], #undef YYCASE_ } + std::string yyres; // Argument number. size_t yyi = 0; for (char const* yyp = yyformat; *yyp; ++yyp) @@ -1077,8 +1123,8 @@ b4_error_verbose_if([state_type yystate, int yytoken], ]b4_parser_tables_define[ ]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[ - /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM. - First, the terminals, then, starting at \a yyntokens_, nonterminals. */ + // YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM. + // First, the terminals, then, starting at \a yyntokens_, nonterminals. const char* const ]b4_parser_class_name[::yytname_[] = { @@ -1107,18 +1153,20 @@ b4_error_verbose_if([state_type yystate, int yytoken], { unsigned int yylno = yyrline_[yyrule]; int yynrhs = yyr2_[yyrule]; - /* Print the symbols being reduced, and their result. */ + // Print the symbols being reduced, and their result. *yycdebug_ << "Reducing stack by rule " << yyrule - 1 << " (line " << yylno << "):" << std::endl; - /* The symbols being reduced. */ + // The symbols being reduced. for (int yyi = 0; yyi < yynrhs; yyi++) YY_SYMBOL_PRINT (" $" << yyi + 1 << " =", ]b4_rhs_data(yynrhs, yyi + 1)[); } #endif // ]b4_api_PREFIX[DEBUG -]b4_lex_symbol_if([], [b4_yytranslate_define])[ +]b4_token_ctor_if([], [b4_yytranslate_define])[ ]b4_namespace_close[ ]b4_epilogue[]dnl -m4_divert_pop(0) +b4_output_end() + + m4_popdef([b4_copyright_years])dnl