X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/742e4900c8b05c8c1f56985288141c890f1e9c73..e5eb92e79462c0f3805c09885ae8a1fe86ee28c6:/data/lalr1.cc diff --git a/data/lalr1.cc b/data/lalr1.cc index b8877f82..5854390e 100644 --- a/data/lalr1.cc +++ b/data/lalr1.cc @@ -1,29 +1,196 @@ -m4_divert(-1) - # C++ skeleton for Bison -# Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. +# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 +# Free Software Foundation, Inc. -# This program is free software; you can redistribute it and/or modify +# 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 -# the Free Software Foundation; either version 2 of the License, or +# the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. - +# # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. - +# # You should have received a copy of the GNU General Public License -# along with this program; if not, write to the Free Software -# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -# 02110-1301 USA +# along with this program. If not, see . m4_include(b4_pkgdatadir/[c++.m4]) +# b4_table_define(TABLE-NAME, CONTENT) +# ------------------------------------ +# Define "parser::yy_" which contents is CONTENT. +m4_define([b4_table_define], +[const b4_int_type_for([$2]) + b4_parser_class_name::yy$1_[[]] = + { + $2 + }dnl +]) + +# b4_symbol_value_template(VAL, [TYPE]) +# ------------------------------------- +# Same as b4_symbol_value, but used in a template method. +m4_copy([b4_symbol_value], [b4_symbol_value_template]) + +# How the semantic value is extracted when using variants. +b4_variant_if([ + # b4_symbol_value(VAL, [TYPE]) + # ---------------------------- + m4_define([b4_symbol_value], + [m4_ifval([$2], + [$1.as<$2>()], + [$1])]) + + # b4_symbol_value_template(VAL, [TYPE]) + # ------------------------------------- + # Same as b4_symbol_value, but used in a template method. + m4_define([b4_symbol_value_template], + [m4_ifval([$2], + [$1.template as<$2>()], + [$1])]) +]) # b4_variant_if + + +# 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 $$. +m4_define([b4_lhs_value], +[b4_symbol_value([yylhs.value], [$1])]) + + +# b4_lhs_location() +# ----------------- +# Expansion of @$. +m4_define([b4_lhs_location], +[yylhs.location]) + + +# b4_rhs_data(RULE-LENGTH, NUM) +# ----------------------------- +# Return the data corresponding to the symbol #NUM, where the current +# rule has RULE-LENGTH symbols on RHS. +m4_define([b4_rhs_data], + [yystack_@{($1) - ($2)@}]) + + +# b4_rhs_state(RULE-LENGTH, NUM) +# ----------------------------- +# The state corresponding to the symbol #NUM, where the current +# rule has RULE-LENGTH symbols on RHS. +m4_define([b4_rhs_state], + [b4_rhs_data([$1], [$2]).state]) + + +# 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], + [b4_symbol_value([b4_rhs_data([$1], [$2]).value], [$3])]) + + +# b4_rhs_location(RULE-LENGTH, NUM) +# --------------------------------- +# Expansion of @NUM, where the current rule has RULE-LENGTH symbols +# on RHS. +m4_define([b4_rhs_location], + [b4_rhs_data([$1], [$2]).location]) + + +# b4_symbol_actions(FILENAME, LINENO, +# SYMBOL-TAG, SYMBOL-NUM, +# SYMBOL-ACTION, SYMBOL-TYPENAME) +# ------------------------------------------------- +# Same as in C, but using references instead of pointers. +m4_define([b4_symbol_actions], +[m4_pushdef([b4_dollar_dollar], + [b4_symbol_value_template([yysym.value], [$6])])dnl +m4_pushdef([b4_at_dollar], [yysym.location])dnl + case $4: // $3 +b4_syncline([$2], [$1]) + $5; +b4_syncline([@oline@], [@ofile@]) + break; +m4_popdef([b4_at_dollar])dnl +m4_popdef([b4_dollar_dollar])dnl +]) + + +# b4_symbol_action_(SYMBOL-TAG, SYMBOL-NUM, SYMBOL-TYPENAME) +# ---------------------------------------------------------- +# Invoke b4_dollar_dollar(SYMBOL_TYPENAME) for each symbol. +m4_define([b4_symbol_action_], +[m4_ifval($3, +[ case $2: // $1 + b4_dollar_dollar($@); + break; +])]) + + +# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS]) +# ------------------------------------------------ +# Run some ACTION ("build", or "destroy") on YYVAL of symbol type +# YYTYPE. +m4_define([b4_symbol_variant], +[m4_pushdef([b4_dollar_dollar], + [$2.$3<$][3>(m4_shift3($@))])dnl + switch ($1) + { +m4_map([b4_symbol_action_], m4_defn([b4_type_names])) + default: + break; + } +m4_popdef([b4_dollar_dollar])dnl +]) + + +# _b4_char_sizeof_counter +# ----------------------- +# A counter used by _b4_char_sizeof_dummy to create fresh symbols. +m4_define([_b4_char_sizeof_counter], +[0]) + +# _b4_char_sizeof_dummy +# --------------------- +# At each call return a new C++ identifier. +m4_define([_b4_char_sizeof_dummy], +[m4_define([_b4_char_sizeof_counter], m4_incr(_b4_char_sizeof_counter))dnl +dummy[]_b4_char_sizeof_counter]) + + +# b4_char_sizeof(SYMBOL-TAG, SYMBOL-NUM, SYMBOL-TYPENAME) +# ------------------------------------------------------- +# To be mapped on the list of type names to produce: +# +# char dummy1[sizeof(type_name_1)]; +# char dummy2[sizeof(type_name_2)]; +# +# for defined type names. +# $3 is doubly-quoted, do not quote it again. +m4_define([b4_char_sizeof], +[m4_ifval($3, +[ + char _b4_char_sizeof_dummy@{sizeof($3)@}; // $1])dnl +]) + + +m4_pushdef([b4_copyright_years], + [2002, 2003, 2004, 2005, 2006, 2007, 2008]) + +m4_define([b4_parser_class_name], + [b4_percent_define_get([[parser_class_name]])]) + # The header is mandatory. b4_defines_if([], - [m4_fatal(b4_skeleton[: using %defines is mandatory])]) + [b4_fatal([b4_skeleton[: using %%defines is mandatory]])]) # Backward compatibility. m4_define([b4_location_constructors]) @@ -31,11 +198,10 @@ m4_include(b4_pkgdatadir/[location.cc]) # We do want M4 expansion after # for CPP macros. m4_changecom() -m4_divert(0)dnl +m4_divert_push(0)dnl b4_defines_if( -[@output @output_header_name@ -b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++], - [2002, 2003, 2004, 2005, 2006]) +[@output(b4_spec_defines_file@)@ +b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++]) dnl FIXME: This is wrong, we want computed header guards. [ /* C++ LALR(1) parser skeleton written by Akim Demaille. */ @@ -43,24 +209,107 @@ dnl FIXME: This is wrong, we want computed header guards. #ifndef PARSER_HEADER_H # define PARSER_HEADER_H +]b4_percent_code_get([[requires]])[ + +]b4_assert_if([#include ])[ #include #include #include "stack.hh" -namespace ]b4_namespace[ -{ +]b4_namespace_open[ class position; class location; -} +]b4_variant_if( +[[ + /// A char[S] buffer to store and retrieve objects. + /// + /// Sort of a variant, but does not keep track of the nature + /// of the stored data, since that knowledge is available + /// via the current state. + template + struct variant + {]b4_assert_if([ + /// Whether something is contained. + bool built; + + /// Initially uninitialized. + variant () + : built(false) + {}])[ + + /// Instantiate a \a T in here. + template + inline T& + build() + {]b4_assert_if([ + assert(!built); + built = true;])[ + return *new (buffer) T; + } -/* First part of user declarations. */ -]b4_pre_prologue[ + /// Instantiate a \a T in here from \a t. + template + inline T& + build(const T& t) + {]b4_assert_if([ + assert(!built); + built = true;])[ + return *new (buffer) T(t); + } + + /// Accessor to a built \a T. + template + inline T& + as() + {]b4_assert_if([ + assert(built);])[ + return reinterpret_cast(buffer); + } + + /// Const accessor to a built \a T (for %printer). + template + inline const T& + as() const + {]b4_assert_if([ + assert(built);])[ + return reinterpret_cast(buffer); + } + + /// Swap the content with \a other. + template + inline void + swap(variant& other) + { + std::swap(as(), other.as()); + } + + /// Assign the content of \a other to this. + /// Destroys \a other. + template + inline void + build(variant& other) + { + build(); + swap(other); + other.destroy(); + } -]/* Line __line__ of lalr1.cc. */ -b4_syncline([@oline@], [@ofile@])[ + /// Destroy the stored \a T. + template + inline void + destroy() + { + as().~T();]b4_assert_if([ + built = false;])[ + } -]dnl Include location.hh here: it might depend on headers included above. -[#include "location.hh" + /// A buffer large enough to store any of the semantic values. + char buffer[S]; + }; +]])[ +]b4_namespace_close[ + +#include "location.hh" /* Enabling traces. */ #ifndef YYDEBUG @@ -85,41 +334,48 @@ b4_syncline([@oline@], [@ofile@])[ the previous symbol: RHS[0] (always defined). */ #ifndef YYLLOC_DEFAULT -# define YYLLOC_DEFAULT(Current, Rhs, N) \ -do { \ - if (N) \ - { \ - (Current).begin = (Rhs)[1].begin; \ - (Current).end = (Rhs)[N].end; \ - } \ - else \ - { \ - (Current).begin = (Current).end = (Rhs)[0].end; \ - } \ +# define YYLLOC_DEFAULT(Current, Rhs, N) \ +do { \ + if (N) \ + { \ + (Current).begin = (Rhs)[1].location.begin; \ + (Current).end = (Rhs)[N].location.end; \ + } \ + else \ + { \ + (Current).begin = (Current).end = (Rhs)[0].location.end; \ + } \ } while (false) #endif -namespace ]b4_namespace[ -{ +]b4_namespace_open[ /// A Bison parser. class ]b4_parser_class_name[ { public: - /// Symbol semantic values. #ifndef YYSTYPE -]m4_ifdef([b4_stype], +]b4_variant_if( +[ /// An auxiliary type to compute the largest semantic type. + union union_type + {]m4_map([b4_char_sizeof], m4_defn([b4_type_names]))[ + }; + + /// Symbol semantic values. + typedef variant semantic_type;], +[ /// Symbol semantic values. +m4_ifdef([b4_stype], [ union semantic_type -b4_stype -/* Line __line__ of lalr1.cc. */ -b4_syncline([@oline@], [@ofile@]) - ;], -[ typedef int semantic_type;])[ + {b4_user_stype + };], +[m4_if(b4_tag_seen_flag, 0, +[[ typedef int semantic_type;]], +[[ typedef YYSTYPE semantic_type;]])])])[ #else typedef YYSTYPE semantic_type; #endif /// Symbol locations. - typedef ]b4_location_type[ location_type; + typedef ]b4_percent_define_get([[location_type]])[ location_type; /// Tokens. struct token { @@ -136,6 +392,7 @@ b4_syncline([@oline@], [@ofile@]) /// \returns 0 iff parsing succeeded. virtual int parse (); +#if YYDEBUG /// The current debugging stream. std::ostream& debug_stream () const; /// Set the current debugging stream. @@ -147,6 +404,7 @@ b4_syncline([@oline@], [@ofile@]) debug_level_type debug_level () const; /// Set the current debugging level. void set_debug_level (debug_level_type l); +#endif private: /// Report a syntax error. @@ -157,42 +415,10 @@ b4_syncline([@oline@], [@ofile@]) /// Generate an error message. /// \param state the state where the error occurred. /// \param tok the lookahead token. - virtual std::string yysyntax_error_ (int yystate]dnl -b4_error_verbose_if([, int tok])[); - -#if YYDEBUG - /// \brief Report a symbol value on the debug stream. - /// \param yytype The token type. - /// \param yyvaluep Its semantic value. - /// \param yylocationp Its location. - virtual void yy_symbol_value_print_ (int yytype, - const semantic_type* yyvaluep, - const location_type* yylocationp); - /// \brief Report a symbol on the debug stream. - /// \param yytype The token type. - /// \param yyvaluep Its semantic value. - /// \param yylocationp Its location. - virtual void yy_symbol_print_ (int yytype, - const semantic_type* yyvaluep, - const location_type* yylocationp); -#endif /* ! YYDEBUG */ - + virtual std::string yysyntax_error_ (int yystate, int tok); /// State numbers. typedef int state_type; - /// State stack type. - typedef stack state_stack_type; - /// Semantic value stack type. - typedef stack semantic_stack_type; - /// location stack type. - typedef stack location_stack_type; - - /// The state stack. - state_stack_type yystate_stack_; - /// The semantic value stack. - semantic_stack_type yysemantic_stack_; - /// The location stack. - location_stack_type yylocation_stack_; /// Internal symbol numbers. typedef ]b4_int_type_for([b4_translate])[ token_number_type; @@ -238,12 +464,6 @@ b4_error_verbose_if([, int tok])[); #endif #if YYDEBUG - /// A type to store symbol numbers and -1. - 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_. - static const ]b4_int_type_for([b4_prhs])[ yyprhs_[]; /// For each rule, its source line number. static const ]b4_int_type_for([b4_rline])[ yyrline_[]; /// For each scanner token number, its symbol number. @@ -252,20 +472,116 @@ b4_error_verbose_if([, int tok])[); virtual void yy_reduce_print_ (int r); /// Print the state stack on the debug stream. virtual void yystack_print_ (); + + /* Debugging. */ + int yydebug_; + std::ostream* yycdebug_; #endif /// Convert a scanner token number \a t to a symbol number. token_number_type yytranslate_ (int t); + /// A complete symbol, with its type. + template + struct symbol_base_type + { + /// Default constructor. + inline symbol_base_type (); + + /// Constructor. + inline symbol_base_type (const semantic_type& v, const location_type& l); + + /// Return this with its exact type. + const Exact& self () const; + Exact& self (); + + /// Return the type of this symbol. + int type_get () const; + + /// The semantic value. + semantic_type value; + + /// The location. + location_type location; + }; + +#if YYDEBUG + /// \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; +#endif + /// \brief Reclaim the memory associated to a symbol. - /// \param yymsg Why this token is reclaimed. - /// \param yytype The symbol type. - /// \param yyvaluep Its semantic value. - /// \param yylocationp Its location. - inline void yydestruct_ (const char* yymsg, - int yytype, - semantic_type* yyvaluep, - location_type* yylocationp); + /// \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; + + /// Element of the stack: a state and its attributes. + struct symbol_type : symbol_base_type + { + /// The parent class. + typedef symbol_base_type super_type; + + /// Default constructor. + inline symbol_type (); + + /// Constructor. + inline symbol_type (int t, + const semantic_type& v, const location_type& l); + + /// The symbol type. + int type; + + /// Return the type corresponding to this state. + inline int type_get_ () const; + }; + + /// Element of the stack: a state and its attributes. + struct stack_symbol_type : symbol_base_type + { + /// The parent class. + typedef symbol_base_type super_type; + + /// Default constructor. + inline stack_symbol_type (); + + /// Constructor. + inline stack_symbol_type (state_type s, + const semantic_type& v, const location_type& l); + + /// The state. + state_type state; + + /// Return the type corresponding to this state. + inline int type_get_ () const; + }; + + /// Stack type. + typedef stack stack_type; + + /// The stack. + stack_type yystack_; + + /// Push a new state on the stack. + /// \param m a debug message to display + /// 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); + + /// Push a new look ahead token on the state on the stack. + /// \param m a debug message to display + /// if null, no trace is output. + /// \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); /// Pop \a n symbols the three stacks. inline void yypop_ (unsigned int n = 1); @@ -282,42 +598,42 @@ b4_error_verbose_if([, int tok])[); static const int yyntokens_; static const unsigned int yyuser_token_number_max_; static const token_number_type yyundef_token_; - - /* Debugging. */ - int yydebug_; - std::ostream* yycdebug_; - ]b4_parse_param_vars[ }; -} -]m4_ifset([b4_global_tokens_and_yystype], +]b4_namespace_close[ + +]b4_percent_define_flag_if([[global_tokens_and_yystype]], [b4_token_defines(b4_tokens) #ifndef YYSTYPE /* Redirection for backward compatibility. */ -# define YYSTYPE b4_namespace::b4_parser_class_name::semantic_type +# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type #endif -])[ -#endif /* ! defined PARSER_HEADER_H */] +]) +b4_percent_code_get([[provides]])[]dnl + +[#endif /* ! defined PARSER_HEADER_H */] ])dnl -@output @output_parser_name@ -b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++], - [2002, 2003, 2004, 2005, 2006]) +@output(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], [], [ // Take the name prefix into account. -#define yylex b4_prefix[]lex]) -b4_defines_if([ -#include @output_header_name@])[ +#define yylex b4_prefix[]lex])[ -/* User implementation prologue. */ -]b4_post_prologue[ +/* First part of user declarations. */ +]b4_user_pre_prologue -]/* Line __line__ of lalr1.cc. */ -b4_syncline([@oline@], [@ofile@])[ +b4_defines_if([[ +#include "@basename(]b4_spec_defines_file[@)"]])[ -#ifndef YY_ +/* User implementation prologue. */ +]b4_user_post_prologue +b4_percent_code_get[]dnl + +[#ifndef YY_ # if YYENABLE_NLS # if ENABLE_NLS # include /* FIXME: INFRINGES ON USER NAME SPACE */ @@ -332,50 +648,52 @@ b4_syncline([@oline@], [@ofile@])[ /* Suppress unused-variable warnings by "using" E. */ #define YYUSE(e) ((void) (e)) -/* A pseudo ostream that takes yydebug_ into account. */ -# define YYCDEBUG \ - for (bool yydebugcond_ = yydebug_; yydebugcond_; yydebugcond_ = false) \ - (*yycdebug_) - /* Enable debugging if requested. */ #if YYDEBUG -# define YY_SYMBOL_PRINT(Title, Type, Value, Location) \ -do { \ - if (yydebug_) \ - { \ - *yycdebug_ << Title << ' '; \ - yy_symbol_print_ ((Type), (Value), (Location)); \ - *yycdebug_ << std::endl; \ - } \ -} while (false) +/* A pseudo ostream that takes yydebug_ into account. */ +# define YYCDEBUG if (yydebug_) (*yycdebug_) + +# define YY_SYMBOL_PRINT(Title, Symbol) \ + do { \ + if (yydebug_) \ + { \ + *yycdebug_ << Title << ' '; \ + yy_print_ (*yycdebug_, Symbol); \ + *yycdebug_ << std::endl; \ + } \ + } while (false) # define YY_REDUCE_PRINT(Rule) \ -do { \ - if (yydebug_) \ - yy_reduce_print_ (Rule); \ -} while (false) + do { \ + if (yydebug_) \ + yy_reduce_print_ (Rule); \ + } while (false) # define YY_STACK_PRINT() \ -do { \ - if (yydebug_) \ - yystack_print_ (); \ -} while (false) + do { \ + if (yydebug_) \ + yystack_print_ (); \ + } while (false) #else /* !YYDEBUG */ -# define YY_SYMBOL_PRINT(Title, Type, Value, Location) -# define YY_REDUCE_PRINT(Rule) -# define YY_STACK_PRINT() +# define YYCDEBUG if (false) std::cerr +# define YY_SYMBOL_PRINT(Title, Symbol) static_cast(0) +# define YY_REDUCE_PRINT(Rule) static_cast(0) +# define YY_STACK_PRINT() static_cast(0) #endif /* !YYDEBUG */ +#define yyerrok (yyerrstatus_ = 0) +#define yyclearin (yychar = yyempty_) + #define YYACCEPT goto yyacceptlab #define YYABORT goto yyabortlab #define YYERROR goto yyerrorlab +#define YYRECOVERING() (!!yyerrstatus_) -namespace ]b4_namespace[ -{ +]b4_namespace_open[ #if YYERROR_VERBOSE /* Return YYSTR after stripping away unnecessary quotes and @@ -418,9 +736,12 @@ namespace ]b4_namespace[ #endif /// Build a parser object. - ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[) - : yydebug_ (false), - yycdebug_ (&std::cerr)]b4_parse_param_cons[ + ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [ + :])[ +#if YYDEBUG + ]m4_ifset([b4_parse_param], [ ], [ :])[yydebug_ (false), + yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[ +#endif]b4_parse_param_cons[ { } @@ -428,64 +749,162 @@ namespace ]b4_namespace[ { } -#if YYDEBUG - /*--------------------------------. - | Print this symbol on YYOUTPUT. | - `--------------------------------*/ - inline void - ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype, - const semantic_type* yyvaluep, const location_type* yylocationp) + /*---------------. + | Symbol types. | + `---------------*/ + + // symbol_base_type. + template + ]b4_parser_class_name[::symbol_base_type::symbol_base_type () + : value() + , location() { - YYUSE (yylocationp); - YYUSE (yyvaluep); - switch (yytype) - { - ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl -[ default: - break; - } } + template + ]b4_parser_class_name[::symbol_base_type::symbol_base_type (const semantic_type& v, const location_type& l) + : value(v) + , location(l) + { + } - void - ]b4_parser_class_name[::yy_symbol_print_ (int yytype, - const semantic_type* yyvaluep, const location_type* yylocationp) + template + const Exact& + ]b4_parser_class_name[::symbol_base_type::self () const + { + return static_cast(*this); + } + + template + Exact& + ]b4_parser_class_name[::symbol_base_type::self () + { + return static_cast(*this); + } + + template + int + ]b4_parser_class_name[::symbol_base_type::type_get () const + { + return self ().type_get_ (); + } + + // symbol_type. + ]b4_parser_class_name[::symbol_type::symbol_type () + : super_type () + , type () + { + } + + ]b4_parser_class_name[::symbol_type::symbol_type (int t, + const semantic_type& v, const location_type& l) + : super_type (v, l) + , type (t) + { + } + + int + ]b4_parser_class_name[::symbol_type::type_get_ () const + { + return type; + } + + // stack_symbol_type. + ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type () + : super_type () + , state () { - *yycdebug_ << (yytype < yyntokens_ ? "token" : "nterm") - << ' ' << yytname_[yytype] << " (" - << *yylocationp << ": "; - yy_symbol_value_print_ (yytype, yyvaluep, yylocationp); - *yycdebug_ << ')'; } -#endif /* ! YYDEBUG */ + ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (state_type s, + const semantic_type& v, const location_type& l) + : super_type (v, l) + , state (s) + { + } + + int + ]b4_parser_class_name[::stack_symbol_type::type_get_ () const + { + return yystos_[state]; + } + + + template void - ]b4_parser_class_name[::yydestruct_ (const char* yymsg, - int yytype, semantic_type* yyvaluep, location_type* yylocationp) + ]b4_parser_class_name[::yy_destroy_ (const char* yymsg, + symbol_base_type& yysym) const { - YYUSE (yylocationp); + int yytype = yysym.type_get (); YYUSE (yymsg); - YYUSE (yyvaluep); - - YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp); + if (yymsg) + YY_SYMBOL_PRINT (yymsg, yysym); + // User destructor. switch (yytype) { ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[ default: break; + }]b4_variant_if([ + + // Type destructor. + b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[ + } + +#if YYDEBUG + template + void + ]b4_parser_class_name[::yy_print_ (std::ostream& yyo, + const symbol_base_type& yysym) const + { + int yytype = yysym.type_get (); + yyo << (yytype < yyntokens_ ? "token" : "nterm") + << ' ' << yytname_[yytype] << " (" + << yysym.location << ": "; + switch (yytype) + { + ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl +[ default: + break; } + yyo << ')'; + } +#endif + + void + ]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 (s, semantic_type(), sym.location)); + ]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]], + [build], [sym.value])], +[ yystack_.push (stack_symbol_type (s, sym.value, sym.location));])[ + } + + 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 (s.state, semantic_type(), s.location)); + ]b4_symbol_variant([[yystos_[s.state]]], [[yystack_[0].value]], + [build], [s.value])], +[ yystack_.push (s);])[ } void ]b4_parser_class_name[::yypop_ (unsigned int n) { - yystate_stack_.pop (n); - yysemantic_stack_.pop (n); - yylocation_stack_.pop (n); + yystack_.pop (n); } +#if YYDEBUG std::ostream& ]b4_parser_class_name[::debug_stream () const { @@ -510,14 +929,13 @@ namespace ]b4_namespace[ { yydebug_ = l; } - +#endif int ]b4_parser_class_name[::parse () { - /// Lookahead and lookahead in internal form. + /// Coded type of the lookahead. int yychar = yyempty_; - int yytoken = 0; /* State. */ int yyn; @@ -528,46 +946,45 @@ namespace ]b4_namespace[ int yynerrs_ = 0; int yyerrstatus_ = 0; - /// Semantic value of the lookahead. - semantic_type yylval; - /// Location of the lookahead. - location_type yylloc; + /// The lookahead symbol. + symbol_type yyla; + /// The locations where the error started and ended. - location yyerror_range[2]; + stack_symbol_type yyerror_range[2]; - /// $$. - semantic_type yyval; - /// @@$. - location_type yyloc; + /// $$ and @@$. + stack_symbol_type yylhs; + /// The return value of parse(). int yyresult; YYCDEBUG << "Starting parse" << std::endl; ]m4_ifdef([b4_initial_action], [ -m4_pushdef([b4_at_dollar], [yylloc])dnl -m4_pushdef([b4_dollar_dollar], [yylval])dnl +m4_pushdef([b4_at_dollar], [yyla.location])dnl +m4_pushdef([b4_dollar_dollar], [yyla.value])dnl /* User initialization code. */ - b4_initial_action + b4_user_initial_action m4_popdef([b4_dollar_dollar])dnl -m4_popdef([b4_at_dollar])dnl - /* Line __line__ of yacc.c. */ -b4_syncline([@oline@], [@ofile@])])dnl +m4_popdef([b4_at_dollar])])dnl - [ /* Initialize the stacks. The initial state will be pushed in + [ /* Initialize the stack. The initial state will be set in yynewstate, since the latter expects the semantical and the location values to have been already stored, initialize these stacks with a primary value. */ - yystate_stack_ = state_stack_type (0); - yysemantic_stack_ = semantic_stack_type (0); - yylocation_stack_ = location_stack_type (0); - yysemantic_stack_.push (yylval); - yylocation_stack_.push (yylloc); + yystack_ = stack_type (0); + yypush_ (0, 0, yyla); - /* New state. */ + // A new state was pushed on the stack. + // Invariant: yystate == yystack_[0].state, i.e., + // yystate was just pushed onto the state stack. yynewstate: - yystate_stack_.push (yystate); YYCDEBUG << "Entering state " << yystate << std::endl; + + /* Accept? */ + if (yystate == yyfinal_) + goto yyacceptlab; + goto yybackup; /* Backup. */ @@ -583,8 +1000,8 @@ b4_syncline([@oline@], [@ofile@])])dnl { YYCDEBUG << "Reading a token: "; yychar = ]b4_c_function_call([yylex], [int], - [[YYSTYPE*], [&yylval]][]dnl -b4_locations_if([, [[location*], [&yylloc]]])dnl + [[YYSTYPE*], [&yyla.value]][]dnl +b4_locations_if([, [[location*], [&yyla.location]]])dnl m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; } @@ -592,19 +1009,19 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; /* Convert token to internal form. */ if (yychar <= yyeof_) { - yychar = yytoken = yyeof_; + yychar = yyla.type = yyeof_; YYCDEBUG << "Now at end of input." << std::endl; } else { - yytoken = yytranslate_ (yychar); - YY_SYMBOL_PRINT ("Next token is", yytoken, &yylval, &yylloc); + yyla.type = yytranslate_ (yychar); + YY_SYMBOL_PRINT ("Next token is", yyla); } - /* If the proper action on seeing token YYTOKEN is to reduce or to - detect an error, take that action. */ - yyn += yytoken; - if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yytoken) + /* 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) goto yydefault; /* Reduce or error. */ @@ -612,31 +1029,22 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; if (yyn <= 0) { if (yyn == 0 || yyn == yytable_ninf_) - goto yyerrlab; + goto yyerrlab; yyn = -yyn; goto yyreduce; } - /* Accept? */ - if (yyn == yyfinal_) - goto yyacceptlab; - - /* Shift the lookahead token. */ - YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc); - - /* Discard the token being shifted unless it is eof. */ - if (yychar != yyeof_) - yychar = yyempty_; - - yysemantic_stack_.push (yylval); - yylocation_stack_.push (yylloc); + /* Discard the token being shifted. */ + yychar = yyempty_; /* Count tokens shifted since error; after three, turn off error status. */ if (yyerrstatus_) --yyerrstatus_; + /* Shift the lookahead token. */ yystate = yyn; + yypush_ ("Shifting", yystate, yyla); goto yynewstate; /*-----------------------------------------------------------. @@ -652,47 +1060,65 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; | yyreduce -- Do a reduction. | `-----------------------------*/ yyreduce: - yylen = yyr2_[yyn]; + yylen = yyr2_[yyn];]b4_variant_if([ + /* Variants are always initialized to an empty instance of the + correct type. The default $$=$1 rule 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: `$$ = $1'. Otherwise, use the top of the stack. - Otherwise, the following line sets YYVAL to garbage. + Otherwise, the following line sets YYLHS.VALUE to garbage. This behavior is undocumented and Bison users should not rely upon it. */ if (yylen) - yyval = yysemantic_stack_[yylen - 1]; + yylhs.value = yystack_@{yylen - 1@}.value; else - yyval = yysemantic_stack_[0]; + yylhs.value = yystack_@{0@}.value;])[ + // Compute the default @@$. { - slice slice (yylocation_stack_, yylen); - YYLLOC_DEFAULT (yyloc, slice, yylen); + slice slice (yystack_, yylen); + YYLLOC_DEFAULT (yylhs.location, slice, yylen); } + + // Perform the reduction. YY_REDUCE_PRINT (yyn); switch (yyn) { - ]b4_actions - /* Line __line__ of lalr1.cc. */ -b4_syncline([@oline@], [@ofile@])[ - default: break; + ]b4_user_actions[ + default: + break; } - YY_SYMBOL_PRINT ("-> $$ =", yyr1_[yyn], &yyval, &yyloc); + // 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; + YY_SYMBOL_PRINT ("-> $$ =", yylhs); +]b4_variant_if([[ + // Destroy the lhs symbols. + for (int i = 0; i < yylen; ++i) + // Destroy a variant which value may have be swapped with + // yylhs.value. The value of yylhs.value (hence maybe one of + // these lhs symbols) depends on what does the default + // contruction for this type. In the case of pointers for + // instance, nothing is done, so the value is junk. Therefore + // do not try to report the content in the debug trace, it's + // junk. Hence yymsg = 0. Besides, that keeps exactly the same + // traces as with the other Bison skeletons. + yy_destroy_ (0, yystack_[i]);]])[ yypop_ (yylen); yylen = 0; YY_STACK_PRINT (); - yysemantic_stack_.push (yyval); - yylocation_stack_.push (yyloc); - /* Shift the result of the reduction. */ - yyn = yyr1_[yyn]; - yystate = yypgoto_[yyn - yyntokens_] + yystate_stack_[0]; - if (0 <= yystate && yystate <= yylast_ - && yycheck_[yystate] == yystate_stack_[0]) - yystate = yytable_[yystate]; - else - yystate = yydefgoto_[yyn - yyntokens_]; + yypush_ (0, yylhs); goto yynewstate; /*------------------------------------. @@ -703,11 +1129,10 @@ b4_syncline([@oline@], [@ofile@])[ if (!yyerrstatus_) { ++yynerrs_; - error (yylloc, yysyntax_error_ (yystate]dnl -b4_error_verbose_if([, yytoken])[)); + error (yyla.location, yysyntax_error_ (yystate, yyla.type)); } - yyerror_range[0] = yylloc; + yyerror_range[0].location = yyla.location; if (yyerrstatus_ == 3) { /* If just tried and failed to reuse lookahead token after an @@ -715,13 +1140,13 @@ b4_error_verbose_if([, yytoken])[)); if (yychar <= yyeof_) { - /* Return failure if at end of input. */ - if (yychar == yyeof_) - YYABORT; + /* Return failure if at end of input. */ + if (yychar == yyeof_) + YYABORT; } else { - yydestruct_ ("Error: discarding", yytoken, &yylval, &yylloc); + yy_destroy_ ("Error: discarding", yyla); yychar = yyempty_; } } @@ -742,12 +1167,12 @@ b4_error_verbose_if([, yytoken])[)); if (false) goto yyerrorlab; - yyerror_range[0] = yylocation_stack_[yylen - 1]; + yyerror_range[0].location = yystack_[yylen - 1].location; /* Do not reclaim the symbols of the rule which action triggered this YYERROR. */ yypop_ (yylen); yylen = 0; - yystate = yystate_stack_[0]; + yystate = yystack_[0].state; goto yyerrlab1; /*-------------------------------------------------------------. @@ -755,49 +1180,40 @@ b4_error_verbose_if([, yytoken])[)); `-------------------------------------------------------------*/ yyerrlab1: yyerrstatus_ = 3; /* Each real token shifted decrements this. */ + { + stack_symbol_type error_token; + for (;;) + { + yyn = yypact_[yystate]; + if (yyn != yypact_ninf_) + { + yyn += yyterror_; + if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_) + { + yyn = yytable_[yyn]; + if (0 < yyn) + break; + } + } - for (;;) - { - yyn = yypact_[yystate]; - if (yyn != yypact_ninf_) - { - yyn += yyterror_; - if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_) - { - yyn = yytable_[yyn]; - if (0 < yyn) - break; - } - } - - /* Pop the current state because it cannot handle the error token. */ - if (yystate_stack_.height () == 1) - YYABORT; - - yyerror_range[0] = yylocation_stack_[0]; - yydestruct_ ("Error: popping", - yystos_[yystate], - &yysemantic_stack_[0], &yylocation_stack_[0]); - yypop_ (); - yystate = yystate_stack_[0]; - YY_STACK_PRINT (); - } - - if (yyn == yyfinal_) - goto yyacceptlab; + // Pop the current state because it cannot handle the error token. + if (yystack_.size () == 1) + YYABORT; - yyerror_range[1] = yylloc; - // Using YYLLOC is tempting, but would change the location of - // the lookahead. YYLOC is available though. - YYLLOC_DEFAULT (yyloc, (yyerror_range - 1), 2); - yysemantic_stack_.push (yylval); - yylocation_stack_.push (yyloc); + yyerror_range[0].location = yystack_[0].location; + yy_destroy_ ("Error: popping", yystack_[0]); + yypop_ (); + yystate = yystack_[0].state; + YY_STACK_PRINT (); + } - /* Shift the error token. */ - YY_SYMBOL_PRINT ("Shifting", yystos_[yyn], - &yysemantic_stack_[0], &yylocation_stack_[0]); + yyerror_range[1].location = yyla.location; + YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2); - yystate = yyn; + /* Shift the error token. */ + error_token.state = yystate = yyn; + yypush_ ("Shifting", error_token); + } goto yynewstate; /* Accept. */ @@ -811,18 +1227,15 @@ b4_error_verbose_if([, yytoken])[)); goto yyreturn; yyreturn: - if (yychar != yyeof_ && yychar != yyempty_) - yydestruct_ ("Cleanup: discarding lookahead", yytoken, &yylval, &yylloc); + if (yychar != yyempty_) + yy_destroy_ ("Cleanup: discarding lookahead", yyla); /* Do not reclaim the symbols of the rule which action triggered this YYABORT or YYACCEPT. */ yypop_ (yylen); - while (yystate_stack_.height () != 1) + while (yystack_.size () != 1) { - yydestruct_ ("Cleanup: popping", - yystos_[yystate_stack_[0]], - &yysemantic_stack_[0], - &yylocation_stack_[0]); + yy_destroy_ ("Cleanup: popping", yystack_[0]); yypop_ (); } @@ -831,8 +1244,8 @@ b4_error_verbose_if([, yytoken])[)); // Generate an error message. std::string - ]b4_parser_class_name[::yysyntax_error_ (int yystate]dnl -b4_error_verbose_if([, int tok])[) + ]b4_parser_class_name[::yysyntax_error_ (int yystate, int]dnl +b4_error_verbose_if([ tok])[) { std::string res; YYUSE (yystate); @@ -883,83 +1296,43 @@ b4_error_verbose_if([, int tok])[) /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing STATE-NUM. */ const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[; - const ]b4_int_type_for([b4_pact])[ - ]b4_parser_class_name[::yypact_[] = - { - ]b4_pact[ - }; + ]b4_table_define([pact], [b4_pact])[; /* YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE doesn't specify something else to do. Zero means the default is an error. */ - const ]b4_int_type_for([b4_defact])[ - ]b4_parser_class_name[::yydefact_[] = - { - ]b4_defact[ - }; + ]b4_table_define([defact], [b4_defact])[; /* YYPGOTO[NTERM-NUM]. */ - const ]b4_int_type_for([b4_pgoto])[ - ]b4_parser_class_name[::yypgoto_[] = - { - ]b4_pgoto[ - }; + ]b4_table_define([pgoto], [b4_pgoto])[; /* YYDEFGOTO[NTERM-NUM]. */ - const ]b4_int_type_for([b4_defgoto])[ - ]b4_parser_class_name[::yydefgoto_[] = - { - ]b4_defgoto[ - }; + ]b4_table_define([defgoto], [b4_defgoto])[; /* YYTABLE[YYPACT[STATE-NUM]]. What to do in state STATE-NUM. If positive, shift that token. If negative, reduce the rule which number is the opposite. If zero, do what YYDEFACT says. */ const ]b4_int_type(b4_table_ninf, b4_table_ninf) b4_parser_class_name::yytable_ninf_ = b4_table_ninf[; - const ]b4_int_type_for([b4_table])[ - ]b4_parser_class_name[::yytable_[] = - { - ]b4_table[ - }; + ]b4_table_define([table], [b4_table])[; /* YYCHECK. */ - const ]b4_int_type_for([b4_check])[ - ]b4_parser_class_name[::yycheck_[] = - { - ]b4_check[ - }; + ]b4_table_define([check], [b4_check])[; /* STOS_[STATE-NUM] -- The (internal number of the) accessing symbol of state STATE-NUM. */ - const ]b4_int_type_for([b4_stos])[ - ]b4_parser_class_name[::yystos_[] = - { - ]b4_stos[ - }; + ]b4_table_define([stos], [b4_stos])[; #if YYDEBUG /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding to YYLEX-NUM. */ - const ]b4_int_type_for([b4_toknum])[ - ]b4_parser_class_name[::yytoken_number_[] = - { - ]b4_toknum[ - }; + ]b4_table_define([token_number], [b4_toknum])[; #endif /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives. */ - const ]b4_int_type_for([b4_r1])[ - ]b4_parser_class_name[::yyr1_[] = - { - ]b4_r1[ - }; + ]b4_table_define([r1], [b4_r1])[; /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN. */ - const ]b4_int_type_for([b4_r2])[ - ]b4_parser_class_name[::yyr2_[] = - { - ]b4_r2[ - }; + ]b4_table_define([r2], [b4_r2])[; #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM. @@ -967,41 +1340,24 @@ b4_error_verbose_if([, int tok])[) const char* const ]b4_parser_class_name[::yytname_[] = { - ]b4_tname[ + ]b4_tname[ }; #endif #if YYDEBUG - /* YYRHS -- A `-1'-separated list of the rules' RHS. */ - const ]b4_parser_class_name[::rhs_number_type - ]b4_parser_class_name[::yyrhs_[] = - { - ]b4_rhs[ - }; - - /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in - YYRHS. */ - const ]b4_int_type_for([b4_prhs])[ - ]b4_parser_class_name[::yyprhs_[] = - { - ]b4_prhs[ - }; - /* YYRLINE[YYN] -- Source line where rule number YYN was defined. */ - const ]b4_int_type_for([b4_rline])[ - ]b4_parser_class_name[::yyrline_[] = - { - ]b4_rline[ - }; + ]b4_table_define([rline], [b4_rline])[; // Print the state stack on the debug stream. void ]b4_parser_class_name[::yystack_print_ () { *yycdebug_ << "Stack now"; - for (state_stack_type::const_iterator i = yystate_stack_.begin (); - i != yystate_stack_.end (); ++i) - *yycdebug_ << ' ' << *i; + for (stack_type::const_iterator + i = yystack_.begin (), + i_end = yystack_.end (); + i != i_end; ++i) + *yycdebug_ << ' ' << i->state; *yycdebug_ << std::endl; } @@ -1013,13 +1369,11 @@ b4_error_verbose_if([, int tok])[) int yynrhs = yyr2_[yyrule]; /* Print the symbols being reduced, and their result. */ *yycdebug_ << "Reducing stack by rule " << yyrule - 1 - << " (line " << yylno << "), "; + << " (line " << yylno << "):" << std::endl; /* The symbols being reduced. */ for (int yyi = 0; yyi < yynrhs; yyi++) YY_SYMBOL_PRINT (" $" << yyi + 1 << " =", - yyrhs_[yyprhs_[yyrule] + yyi], - &]b4_rhs_value(yynrhs, yyi + 1)[, - &]b4_rhs_location(yynrhs, yyi + 1)[); + ]b4_rhs_data(yynrhs, yyi + 1)[); } #endif // YYDEBUG @@ -1031,7 +1385,7 @@ b4_error_verbose_if([, int tok])[) const token_number_type translate_table[] = { - ]b4_translate[ + ]b4_translate[ }; if ((unsigned int) t <= yyuser_token_number_max_) return translate_table[t]; @@ -1051,21 +1405,18 @@ b4_error_verbose_if([, int tok])[) const unsigned int ]b4_parser_class_name[::yyuser_token_number_max_ = ]b4_user_token_number_max[; const ]b4_parser_class_name[::token_number_type ]b4_parser_class_name[::yyundef_token_ = ]b4_undef_token_number[; -} // namespace ]b4_namespace[ +]b4_namespace_close[ -]b4_epilogue -dnl -@output b4_dir_prefix[]stack.hh -b4_copyright([Stack handling for Bison parsers in C++], - [2002, 2003, 2004, 2005, 2006])[ +]b4_epilogue[]dnl +@output(b4_dir_prefix[]stack.hh@)@ +b4_copyright([Stack handling for Bison parsers in C++])[ #ifndef BISON_STACK_HH # define BISON_STACK_HH #include -namespace ]b4_namespace[ -{ +]b4_namespace_open[ template > class stack { @@ -1113,17 +1464,17 @@ namespace ]b4_namespace[ } inline - unsigned int - height () const + typename S::size_type + size () const { return seq_.size (); } inline const_iterator begin () const { return seq_.rbegin (); } - inline const_iterator end () const { return seq_.rend (); } + inline const_iterator end () const { return seq_.rend (); } private: - + /// The wrapped container. S seq_; }; @@ -1151,7 +1502,9 @@ namespace ]b4_namespace[ const S& stack_; unsigned int range_; }; -} +]b4_namespace_close[ -#endif // not BISON_STACK_HH] -m4_divert(-1) +#endif // not BISON_STACK_HH[]dnl +] +m4_divert_pop(0) +m4_popdef([b4_copyright_years])dnl