X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/fc049e9cafa1322aa5cb1d7d64ad61ab2a41dd59..f69a414266dce31834b7e52d614f187e5e159034:/data/lalr1.cc diff --git a/data/lalr1.cc b/data/lalr1.cc index c0403fbc..4f60505a 100644 --- a/data/lalr1.cc +++ b/data/lalr1.cc @@ -1,6 +1,6 @@ m4_divert(-1) # C++ skeleton for Bison -# Copyright (C) 2002, 2003 Free Software Foundation, Inc. +# Copyright (C) 2002, 2003, 2004 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 @@ -21,9 +21,6 @@ m4_divert(-1) ## Default values. ## ## ---------------- ## -# Stack parameters. -m4_define_default([b4_stack_depth_init], [200]) - # Default Parser class name. m4_define_default([b4_parser_class_name], [Parser]) @@ -65,23 +62,48 @@ m4_define([b4_rhs_location], [location_stack_@{m4_eval([$1 - $2])@}]) -m4_define([b4_inherit], - [m4_ifdef([b4_root], - [: public b4_root -], - [])]) - -m4_define([b4_param], - [m4_ifdef([b4_root], - [, - const Param& param], - [])]) +# 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_define([b4_constructor], - [m4_ifdef([b4_root], - [b4_root (param), - ], - [])]) # We do want M4 expansion after # for CPP macros. @@ -90,7 +112,7 @@ m4_divert(0)dnl m4_if(b4_defines_flag, 0, [], [@output @output_header_name@ b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison], - [2002, 2003])[ + [2002, 2003, 2004])[ /* FIXME: This is wrong, we want computed header guards. I don't know why the macros are missing now. :( */ #ifndef PARSER_HEADER_H @@ -123,14 +145,16 @@ b4_syncline([@oline@], [@ofile@])[ # define YYERROR_VERBOSE ]b4_error_verbose[ #endif -#ifndef YYSTYPE +#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED) ]m4_ifdef([b4_stype], [b4_syncline([b4_stype_line], [b4_filename]) -typedef union b4_stype yystype; +union YYSTYPE b4_stype; /* Line __line__ of lalr1.cc. */ b4_syncline([@oline@], [@ofile@])], -[typedef int yystype;])[ -# define YYSTYPE yystype +[typedef int YYSTYPE;])[ +# define yystype YYSTYPE /* obsolescent; will be withdrawn */ +# define YYSTYPE_IS_DECLARED 1 +# define YYSTYPE_IS_TRIVIAL 1 #endif /* Copy the second part of user declarations. */ @@ -138,59 +162,64 @@ b4_syncline([@oline@], [@ofile@])], ]/* Line __line__ of lalr1.cc. */ b4_syncline([@oline@], [@ofile@])[ +/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N]. + If N is 0, then set CURRENT to the empty location which ends + the previous symbol: RHS[0] (always defined). */ + #ifndef YYLLOC_DEFAULT -# define YYLLOC_DEFAULT(Current, Rhs, N) \ - Current.last_line = Rhs[N].last_line; \ - Current.last_column = Rhs[N].last_column; +# 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; \ + } \ +} while (0) #endif namespace yy { class ]b4_parser_class_name[; - template < typename P > + template struct Traits { }; - template < > - struct Traits< ]b4_parser_class_name[ > + template <> + struct Traits<]b4_parser_class_name[> { typedef ]b4_int_type_for([b4_translate])[ TokenNumberType; typedef ]b4_int_type_for([b4_rhs])[ RhsNumberType; - typedef int StateType; - typedef yystype SemanticType; + typedef int StateType; + typedef YYSTYPE SemanticType; typedef ]b4_location_type[ LocationType; }; } namespace yy { - class ]b4_parser_class_name b4_inherit[ + class ]b4_parser_class_name[ { public: - typedef Traits< ]b4_parser_class_name[ >::TokenNumberType TokenNumberType; - typedef Traits< ]b4_parser_class_name[ >::RhsNumberType RhsNumberType; - typedef Traits< ]b4_parser_class_name[ >::StateType StateType; - typedef Traits< ]b4_parser_class_name[ >::SemanticType SemanticType; - typedef Traits< ]b4_parser_class_name[ >::LocationType LocationType; + typedef Traits<]b4_parser_class_name[>::TokenNumberType TokenNumberType; + typedef Traits<]b4_parser_class_name[>::RhsNumberType RhsNumberType; + typedef Traits<]b4_parser_class_name[>::StateType StateType; + typedef Traits<]b4_parser_class_name[>::SemanticType SemanticType; + typedef Traits<]b4_parser_class_name[>::LocationType LocationType; - typedef Stack< StateType > StateStack; - typedef Stack< SemanticType > SemanticStack; - typedef Stack< LocationType > LocationStack; + typedef Stack StateStack; + typedef Stack SemanticStack; + typedef Stack LocationStack; -#if YYLSP_NEEDED - ]b4_parser_class_name[ (bool debug, - LocationType initlocation][]b4_param[) : - ]b4_constructor[][debug_ (debug), - cdebug_ (std::cerr), - initlocation_ (initlocation) -#else - ]b4_parser_class_name[ (bool debug][]b4_param[) : - ]b4_constructor[][debug_ (debug), - cdebug_ (std::cerr) -#endif + ]b4_parser_class_name[ (]b4_parse_param_decl[) : + yydebug_ (false), + yycdebug_ (&std::cerr)]b4_parse_param_cons[ { } @@ -198,28 +227,57 @@ namespace yy { } + /// Parse. + /// \returns 0 iff parsing succeeded. virtual int parse (); + /// The current debugging stream. + std::ostream& debug_stream () const; + /// 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; + /// Set the current debugging level. + void set_debug_level (debug_level_type l); + private: - virtual void lex_ (); + /// Call the scanner. + virtual void yylex_ (); virtual void error_ (); - virtual void print_ (); + /// Generate an error message, and invoke error. */ + virtual void yyreport_syntax_error_ (); +#if YYDEBUG + /// \brief Report a symbol on the debug stream. + /// \param yytype The token type. + /// \param yyvaluep Its semantic value. + /// \param yylocationp Its location. + virtual void yysymprint_ (int yytype, + const SemanticType* yyvaluep, + const LocationType* yylocationp); +#endif /* ! YYDEBUG */ - /* Stacks. */ + + /// The state stack. StateStack state_stack_; + /// The semantic value stack. SemanticStack semantic_stack_; + /// The location stack. LocationStack location_stack_; /* Tables. */ static const ]b4_int_type_for([b4_pact])[ pact_[]; - static const ]b4_int_type_for([b4_pact])[ pact_ninf_; + static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ pact_ninf_; static const ]b4_int_type_for([b4_defact])[ defact_[]; static const ]b4_int_type_for([b4_pgoto])[ pgoto_[]; static const ]b4_int_type_for([b4_defgoto])[ defgoto_[]; static const ]b4_int_type_for([b4_table])[ table_[]; - static const ]b4_int_type_for([b4_table])[ table_ninf_; + static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ table_ninf_; static const ]b4_int_type_for([b4_check])[ check_[]; + static const ]b4_int_type_for([b4_stos])[ stos_[]; static const ]b4_int_type_for([b4_r1])[ r1_[]; static const ]b4_int_type_for([b4_r2])[ r2_[]; @@ -232,12 +290,26 @@ namespace yy static const RhsNumberType rhs_[]; static const ]b4_int_type_for([b4_prhs])[ prhs_[]; static const ]b4_int_type_for([b4_rline])[ rline_[]; - static const ]b4_int_type_for([b4_stos])[ stos_[]; static const ]b4_int_type_for([b4_toknum])[ token_number_[]; + virtual void yyreduce_print_ (int yyrule); + virtual void yystack_print_ (); #endif - /* Even more tables. */ - static inline TokenNumberType translate_ (int token); + /// Convert a scanner token number to a symbol number. + inline TokenNumberType yytranslate_ (int token); + + /// \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, + SemanticType* yyvaluep, + LocationType* yylocationp); + + /// Pop \a n symbols the three stacks. + inline void yypop_ (unsigned int n = 1); /* Constants. */ static const int eof_; @@ -249,8 +321,7 @@ namespace yy static const int terror_; static const int errcode_; static const int ntokens_; - static const int initdepth_; - static const unsigned user_token_number_max_; + static const unsigned int user_token_number_max_; static const TokenNumberType undef_token_; /* State. */ @@ -258,27 +329,33 @@ namespace yy int len_; int state_; + /* Error handling. */ + int nerrs_; + int errstatus_; + /* Debugging. */ - int debug_; - std::ostream &cdebug_; + int yydebug_; + std::ostream* yycdebug_; - /* Lookahead and lookahead in internal form. */ + /* Look-ahead and look-ahead in internal form. */ int looka_; int ilooka_; /* Message. */ std::string message; - /* Semantic value and location of lookahead token. */ + /// Semantic value of the look-ahead. SemanticType value; + /// Location of the look-ahead. LocationType location; + /// The locations where the error started and ended. + Location error_range_[2]; - /* @@$ and $$. */ + /// $$. SemanticType yyval; + /// @@$. LocationType yyloc; - - /* Initial location. */ - LocationType initlocation_; +]b4_parse_param_vars[ }; } @@ -286,81 +363,197 @@ namespace yy ])dnl @output @output_parser_name@ b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison], - [2002, 2003]) + [2002, 2003, 2004]) m4_if(b4_defines_flag, 0, [], [#include @output_header_name@])[ +/* 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 YYCDEBUG if (debug_) cdebug_ + +# define YY_SYMBOL_PRINT(Title, Type, Value, Location) \ +do { \ + if (yydebug_) \ + { \ + *yycdebug_ << (Title) << ' '; \ + yysymprint_ ((Type), (Value), (Location)); \ + *yycdebug_ << std::endl; \ + } \ +} while (0) + +# define YY_REDUCE_PRINT(Rule) \ +do { \ + if (yydebug_) \ + yyreduce_print_ (Rule); \ +} while (0) + +# define YY_STACK_PRINT() \ +do { \ + if (yydebug_) \ + yystack_print_ (); \ +} while (0) + #else /* !YYDEBUG */ -# define YYCDEBUG if (0) cdebug_ + +# define YY_SYMBOL_PRINT(Title, Type, Value, Location) +# define YY_REDUCE_PRINT(Rule) +# define YY_STACK_PRINT() + #endif /* !YYDEBUG */ +#define YYACCEPT goto yyacceptlab +#define YYABORT goto yyabortlab +#define YYERROR goto yyerrorlab + +#if YYDEBUG +/*--------------------------------. +| Print this symbol on YYOUTPUT. | +`--------------------------------*/ + +void +yy::]b4_parser_class_name[::yysymprint_ (int yytype, + const SemanticType* yyvaluep, const LocationType* yylocationp) +{ + /* Pacify ``unused variable'' warnings. */ + (void) yyvaluep; + (void) yylocationp; + /* Backward compatibility, but should be removed eventually. */ + std::ostream& cdebug_ = *yycdebug_; + (void) cdebug_; + + *yycdebug_ << (yytype < ntokens_ ? "token" : "nterm") + << ' ' << name_[yytype] << " (" + << *yylocationp << ": "; + switch (yytype) + { +]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl +[ default: + break; + } + *yycdebug_ << ')'; +} +#endif /* ! YYDEBUG */ + +void +yy::]b4_parser_class_name[::yydestruct_ (const char* yymsg, + int yytype, SemanticType* yyvaluep, LocationType* yylocationp) +{ + /* Pacify ``unused variable'' warnings. */ + (void) yyvaluep; + (void) yylocationp; + + YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp); + + switch (yytype) + { +]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[ + default: + break; + } +} + +void +yy::]b4_parser_class_name[::yypop_ (unsigned int n) +{ + state_stack_.pop (n); + semantic_stack_.pop (n); + location_stack_.pop (n); +} + +std::ostream& +yy::]b4_parser_class_name[::debug_stream () const +{ + return *yycdebug_; +} + +void +yy::]b4_parser_class_name[::set_debug_stream (std::ostream& o) +{ + yycdebug_ = &o; +} + + +yy::]b4_parser_class_name[::debug_level_type +yy::]b4_parser_class_name[::debug_level () const +{ + return yydebug_; +} + +void +yy::]b4_parser_class_name[::set_debug_level (debug_level_type l) +{ + yydebug_ = l; +} + + int yy::]b4_parser_class_name[::parse () { - int nerrs = 0; - int errstatus = 0; + YYCDEBUG << "Starting parse" << std::endl; - /* Initialize the stacks. The initial state will be pushed in - yynewstate, since the latter expects the semantical and the - location values to have been already stored, initialize these - stacks with a primary value. */ - state_stack_ = StateStack (0); - semantic_stack_ = SemanticStack (1); - location_stack_ = LocationStack (1); + nerrs_ = 0; + errstatus_ = 0; /* Start. */ state_ = 0; looka_ = empty_; -#if YYLSP_NEEDED - location = initlocation_; -#endif - YYCDEBUG << "Starting parse" << std::endl; + +]m4_ifdef([b4_initial_action], [ +m4_pushdef([b4_at_dollar], [location])dnl +m4_pushdef([b4_dollar_dollar], [value])dnl + /* User initialization code. */ + b4_initial_action +m4_popdef([b4_dollar_dollar])dnl +m4_popdef([b4_at_dollar])dnl +/* Line __line__ of yacc.c. */ +b4_syncline([@oline@], [@ofile@])])dnl + +[ /* Initialize the stacks. The initial state will be pushed in + yynewstate, since the latter expects the semantical and the + location values to have been already stored, initialize these + stacks with a primary value. */ + state_stack_ = StateStack (0); + semantic_stack_ = SemanticStack (0); + location_stack_ = LocationStack (0); + semantic_stack_.push (value); + location_stack_.push (location); /* New state. */ - yynewstate: +yynewstate: state_stack_.push (state_); YYCDEBUG << "Entering state " << state_ << std::endl; goto yybackup; /* Backup. */ - yybackup: +yybackup: - /* Try to take a decision without lookahead. */ + /* Try to take a decision without look-ahead. */ n_ = pact_[state_]; if (n_ == pact_ninf_) goto yydefault; - /* Read a lookahead token. */ + /* Read a look-ahead token. */ if (looka_ == empty_) - { - YYCDEBUG << "Reading a token: "; - lex_ (); - } + yylex_ (); /* Convert token to internal form. */ - if (looka_ <= 0) + if (looka_ <= eof_) { - looka_ = eof_; - ilooka_ = 0; + looka_ = ilooka_ = eof_; YYCDEBUG << "Now at end of input." << std::endl; } else { - ilooka_ = translate_ (looka_); -#if YYDEBUG - if (debug_) - { - YYCDEBUG << "Next token is " << looka_ - << " (" << name_[ilooka_]; - print_ (); - YYCDEBUG << ')' << std::endl; - } -#endif + ilooka_ = yytranslate_ (looka_); + YY_SYMBOL_PRINT ("Next token is", ilooka_, &value, &location); } + /* If the proper action on seeing token ILOOKA_ is to reduce or to + detect an error, take that action. */ n_ += ilooka_; if (n_ < 0 || last_ < n_ || check_[n_] != ilooka_) goto yydefault; @@ -384,11 +577,8 @@ yy::]b4_parser_class_name[::parse () if (n_ == final_) goto yyacceptlab; - /* Shift the lookahead token. */ -#if YYDEBUG - YYCDEBUG << "Shifting token " << looka_ - << " (" << name_[ilooka_] << "), "; -#endif + /* Shift the look-ahead token. */ + YY_SYMBOL_PRINT ("Shifting", ilooka_, &value, &location); /* Discard the token being shifted unless it is eof. */ if (looka_ != eof_) @@ -399,51 +589,42 @@ yy::]b4_parser_class_name[::parse () /* Count tokens shifted since error; after three, turn off error status. */ - if (errstatus) - --errstatus; + if (errstatus_) + --errstatus_; state_ = n_; goto yynewstate; - /* Default action. */ - yydefault: +/*-----------------------------------------------------------. +| yydefault -- do the default action for the current state. | +`-----------------------------------------------------------*/ +yydefault: n_ = defact_[state_]; if (n_ == 0) goto yyerrlab; goto yyreduce; - /* Reduce. */ - yyreduce: +/*-----------------------------. +| yyreduce -- Do a reduction. | +`-----------------------------*/ +yyreduce: len_ = r2_[n_]; - if (len_) - { - yyval = semantic_stack_[len_ - 1]; - yyloc = location_stack_[len_ - 1]; - } - else - { - yyval = semantic_stack_[0]; - yyloc = location_stack_[0]; - } - -#if YYDEBUG - if (debug_) - { - YYCDEBUG << "Reducing via rule " << n_ - 1 - << " (line " << rline_[n_] << "), "; - for (]b4_int_type_for([b4_prhs])[ i = prhs_[n_]; - 0 <= rhs_[i]; ++i) - YYCDEBUG << name_[rhs_[i]] << ' '; - YYCDEBUG << "-> " << name_[r1_[n_]] << std::endl; - } -#endif + /* If LEN_ 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. + This behavior is undocumented and Bison + users should not rely upon it. */ if (len_) - { - Slice< LocationType, LocationStack > slice (location_stack_, len_); - YYLLOC_DEFAULT (yyloc, slice, len_); - } + yyval = semantic_stack_[len_ - 1]; + else + yyval = semantic_stack_[0]; + { + Slice slice (location_stack_, len_); + YYLLOC_DEFAULT (yyloc, slice, len_); + } + YY_REDUCE_PRINT (n_); switch (n_) { ]b4_actions[ @@ -452,20 +633,9 @@ yy::]b4_parser_class_name[::parse () ]/* Line __line__ of lalr1.cc. */ b4_syncline([@oline@], [@ofile@])[ - state_stack_.pop (len_); - semantic_stack_.pop (len_); - location_stack_.pop (len_); + yypop_ (len_); -#if YYDEBUG - if (debug_) - { - YYCDEBUG << "state stack now"; - for (StateStack::ConstIterator i = state_stack_.begin (); - i != state_stack_.end (); ++i) - YYCDEBUG << ' ' << *i; - YYCDEBUG << std::endl; - } -#endif + YY_STACK_PRINT (); semantic_stack_.push (yyval); location_stack_.push (yyloc); @@ -479,62 +649,71 @@ b4_syncline([@oline@], [@ofile@])[ state_ = defgoto_[n_ - ntokens_]; goto yynewstate; - /* Report and recover from errors. This is very incomplete. */ - yyerrlab: +/*------------------------------------. +| yyerrlab -- here on detecting error | +`------------------------------------*/ +yyerrlab: /* If not already recovering from an error, report this error. */ - if (!errstatus) - { - ++nerrs; + yyreport_syntax_error_ (); -#if YYERROR_VERBOSE - n_ = pact_[state_]; - if (pact_ninf_ < n_ && n_ < last_) - { - message = "syntax error, unexpected "; - message += name_[ilooka_]; - { - int count = 0; - for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x) - if (check_[x + n_] == x && x != terror_) - ++count; - if (count < 5) - { - count = 0; - for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x) - if (check_[x + n_] == x && x != terror_) - { - message += (!count++) ? ", expecting " : " or "; - message += name_[x]; - } - } - } - } - else -#endif - message = "syntax error"; - error_ (); - } - goto yyerrlab1; - - /* Error raised explicitly by an action. */ - yyerrlab1: - if (errstatus == 3) + error_range_[0] = location; + if (errstatus_ == 3) { - /* If just tried and failed to reuse lookahead token after an + /* If just tried and failed to reuse look-ahead token after an error, discard it. */ /* Return failure if at end of input. */ - if (looka_ == eof_) - goto yyabortlab; - YYCDEBUG << "Discarding token " << looka_ - << " (" << name_[ilooka_] << ")." << std::endl; - looka_ = empty_; + if (looka_ <= eof_) + { + /* If at end of input, pop the error token, + then the rest of the stack, then return failure. */ + if (looka_ == eof_) + for (;;) + { + error_range_[0] = location_stack_[0]; + yypop_ (); + if (state_stack_.height () == 1) + YYABORT; + yydestruct_ ("Error: popping", + stos_[state_stack_[0]], + &semantic_stack_[0], + &location_stack_[0]); + } + } + else + { + yydestruct_ ("Error: discarding", ilooka_, &value, &location); + looka_ = empty_; + } } - /* Else will try to reuse lookahead token after shifting the error + /* Else will try to reuse look-ahead token after shifting the error token. */ + goto yyerrlab1; + - errstatus = 3; +/*---------------------------------------------------. +| yyerrorlab -- error raised explicitly by YYERROR. | +`---------------------------------------------------*/ +yyerrorlab: + +#ifdef __GNUC__ + /* Pacify GCC when the user code never invokes YYERROR and the label + yyerrorlab therefore never appears in user code. */ + if (0) + goto yyerrorlab; +#endif + + error_range_[0] = location_stack_[len_ - 1]; + yypop_ (len_); + state_ = state_stack_[0]; + goto yyerrlab1; + +/*-------------------------------------------------------------. +| yyerrlab1 -- common code for both syntax error and YYERROR. | +`-------------------------------------------------------------*/ +yyerrlab1: + errstatus_ = 3; /* Each real token shifted decrements this. */ for (;;) { @@ -552,79 +731,99 @@ b4_syncline([@oline@], [@ofile@])[ /* Pop the current state because it cannot handle the error token. */ if (state_stack_.height () == 1) - goto yyabortlab; - -#if YYDEBUG - if (debug_) - { - if (stos_[state_] < ntokens_) - { - YYCDEBUG << "Error: popping token " - << token_number_[stos_[state_]] - << " (" << name_[stos_[state_]]; -# ifdef YYPRINT - YYPRINT (stderr, token_number_[stos_[state_]], - semantic_stack_.top ()); -# endif - YYCDEBUG << ')' << std::endl; - } - else - { - YYCDEBUG << "Error: popping nonterminal (" - << name_[stos_[state_]] << ')' << std::endl; - } - } -#endif - - state_ = (state_stack_.pop (), state_stack_[0]); - semantic_stack_.pop (); - location_stack_.pop ();; - -#if YYDEBUG - if (debug_) - { - YYCDEBUG << "Error: state stack now"; - for (StateStack::ConstIterator i = state_stack_.begin (); - i != state_stack_.end (); ++i) - YYCDEBUG << ' ' << *i; - YYCDEBUG << std::endl; - } -#endif + YYABORT; + + error_range_[0] = location_stack_[0]; + yydestruct_ ("Error: popping", + stos_[state_], &semantic_stack_[0], &location_stack_[0]); + yypop_ (); + state_ = state_stack_[0]; + YY_STACK_PRINT (); } if (n_ == final_) goto yyacceptlab; - YYCDEBUG << "Shifting error token, "; - + error_range_[1] = location; + // Using LOCATION is tempting, but would change the location of + // the look-ahead. YYLOC is available though. + YYLLOC_DEFAULT (yyloc, error_range_ - 1, 2); semantic_stack_.push (value); - location_stack_.push (location); + location_stack_.push (yyloc); + + /* Shift the error token. */ + YY_SYMBOL_PRINT ("Shifting", stos_[n_], + &semantic_stack_[0], &location_stack_[0]); state_ = n_; goto yynewstate; /* Accept. */ - yyacceptlab: +yyacceptlab: return 0; /* Abort. */ - yyabortlab: +yyabortlab: + /* Free the lookahead. */ + yydestruct_ ("Error: discarding lookahead", ilooka_, &value, &location); + looka_ = empty_; return 1; } void -yy::]b4_parser_class_name[::lex_ () +yy::]b4_parser_class_name[::yylex_ () { + YYCDEBUG << "Reading a token: "; #if YYLSP_NEEDED - looka_ = yylex (&value, &location); + looka_ = ]m4_default(b4_prefix, [yy])[lex (&value, &location); #else - looka_ = yylex (&value); + looka_ = ]m4_default(b4_prefix, [yy])[lex (&value); #endif } +// Generate an error message, and invoke error. +void +yy::]b4_parser_class_name[::yyreport_syntax_error_ () +{ + /* If not already recovering from an error, report this error. */ + if (!errstatus_) + { + ++nerrs_; + +#if YYERROR_VERBOSE + n_ = pact_[state_]; + if (pact_ninf_ < n_ && n_ < last_) + { + message = "syntax error, unexpected "; + message += name_[ilooka_]; + { + int count = 0; + for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x) + if (check_[x + n_] == x && x != terror_) + ++count; + if (count < 5) + { + count = 0; + for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x) + if (check_[x + n_] == x && x != terror_) + { + message += (!count++) ? ", expecting " : " or "; + message += name_[x]; + } + } + } + } + else +#endif + message = "syntax error"; + error_ (); + } +} + + /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing STATE-NUM. */ -const ]b4_int_type_for([b4_pact]) yy::b4_parser_class_name::pact_ninf_ = b4_pact_ninf[; +const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) yy::b4_parser_class_name::pact_ninf_ = b4_pact_ninf[; const ]b4_int_type_for([b4_pact])[ yy::]b4_parser_class_name[::pact_[] = { @@ -657,7 +856,7 @@ yy::]b4_parser_class_name[::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_for([b4_table]) yy::b4_parser_class_name::table_ninf_ = b4_table_ninf[; +const ]b4_int_type(b4_table_ninf, b4_table_ninf) yy::b4_parser_class_name::table_ninf_ = b4_table_ninf[; const ]b4_int_type_for([b4_table])[ yy::]b4_parser_class_name[::table_[] = { @@ -671,7 +870,6 @@ yy::]b4_parser_class_name[::check_[] = ]b4_check[ }; -#if YYDEBUG /* STOS_[STATE-NUM] -- The (internal number of the) accessing symbol of state STATE-NUM. */ const ]b4_int_type_for([b4_stos])[ @@ -680,6 +878,7 @@ yy::]b4_parser_class_name[::stos_[] = ]b4_stos[ }; +#if YYDEBUG /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal token number corresponding to YYLEX-NUM. */ const ]b4_int_type_for([b4_toknum])[ @@ -705,7 +904,7 @@ yy::]b4_parser_class_name[::r2_[] = #if YYDEBUG || YYERROR_VERBOSE /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM. - First, the terminals, then, starting at YYNTOKENS, nonterminals. */ + First, the terminals, then, starting at NTOKENS_, nonterminals. */ const char* const yy::]b4_parser_class_name[::name_[] = { @@ -735,20 +934,45 @@ yy::]b4_parser_class_name[::rline_[] = { ]b4_rline[ }; -#endif + +/// Print the state stack on the debug stream. +void +yy::]b4_parser_class_name[::yystack_print_ () +{ + *yycdebug_ << "Stack now"; + for (StateStack::const_iterator i = state_stack_.begin (); + i != state_stack_.end (); ++i) + *yycdebug_ << ' ' << *i; + *yycdebug_ << std::endl; +} + +/// Report on the debug stream that the rule \a yyrule is going to be reduced. +void +yy::]b4_parser_class_name[::yyreduce_print_ (int yyrule) +{ + unsigned int yylno = rline_[yyrule]; + /* Print the symbols being reduced, and their result. */ + *yycdebug_ << "Reducing stack by rule " << n_ - 1 + << " (line " << yylno << "), "; + for (]b4_int_type_for([b4_prhs])[ i = prhs_[n_]; + 0 <= rhs_[i]; ++i) + *yycdebug_ << name_[rhs_[i]] << ' '; + *yycdebug_ << "-> " << name_[r1_[n_]] << std::endl; +} +#endif // YYDEBUG /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX. */ yy::]b4_parser_class_name[::TokenNumberType -yy::]b4_parser_class_name[::translate_ (int token) +yy::]b4_parser_class_name[::yytranslate_ (int token) { static const TokenNumberType - translate_[] = + translate_table[] = { ]b4_translate[ }; - if ((unsigned) token <= user_token_number_max_) - return translate_[token]; + if ((unsigned int) token <= user_token_number_max_) + return translate_table[token]; else return undef_token_; } @@ -761,15 +985,14 @@ const int yy::]b4_parser_class_name[::final_ = ]b4_final_state_number[; const int yy::]b4_parser_class_name[::terror_ = 1; const int yy::]b4_parser_class_name[::errcode_ = 256; const int yy::]b4_parser_class_name[::ntokens_ = ]b4_tokens_number[; -const int yy::]b4_parser_class_name[::initdepth_ = ]b4_stack_depth_init[; -const unsigned yy::]b4_parser_class_name[::user_token_number_max_ = ]b4_user_token_number_max[; +const unsigned int yy::]b4_parser_class_name[::user_token_number_max_ = ]b4_user_token_number_max[; const yy::]b4_parser_class_name[::TokenNumberType yy::]b4_parser_class_name[::undef_token_ = ]b4_undef_token_number[; ]b4_epilogue dnl @output stack.hh -b4_copyright([2002, 2003])[ +b4_copyright([Stack handling for Bison C++ parsers], [2002, 2003, 2004])[ #ifndef BISON_STACK_HH # define BISON_STACK_HH @@ -778,34 +1001,35 @@ b4_copyright([2002, 2003])[ namespace yy { - template < class T, class S = std::deque< T > > + template > class Stack { public: - typedef typename S::iterator Iterator; - typedef typename S::const_iterator ConstIterator; + // Hide our reversed order. + typedef typename S::reverse_iterator iterator; + typedef typename S::const_reverse_iterator const_iterator; Stack () : seq_ () { } - Stack (unsigned n) : seq_ (n) + Stack (unsigned int n) : seq_ (n) { } inline T& - operator [] (unsigned index) + operator [] (unsigned int i) { - return seq_[index]; + return seq_[i]; } inline const T& - operator [] (unsigned index) const + operator [] (unsigned int i) const { - return seq_[index]; + return seq_[i]; } inline @@ -817,73 +1041,272 @@ namespace yy inline void - pop (unsigned n = 1) + pop (unsigned int n = 1) { for (; n; --n) seq_.pop_front (); } inline - unsigned + unsigned int height () const { return seq_.size (); } - inline ConstIterator begin () const { return seq_.begin (); } - inline ConstIterator end () const { return seq_.end (); } + inline const_iterator begin () const { return seq_.rbegin (); } + inline const_iterator end () const { return seq_.rend (); } private: S seq_; }; - template < class T, class S = Stack< T > > + template > class Slice { public: Slice (const S& stack, - unsigned range) : stack_ (stack), - range_ (range) + unsigned int range) : stack_ (stack), + range_ (range) { } inline const T& - operator [] (unsigned index) const + operator [] (unsigned int i) const { - return stack_[range_ - index]; + return stack_[range_ - i]; } private: const S& stack_; - unsigned range_; + unsigned int range_; }; } #endif // not BISON_STACK_HH] dnl +@output position.hh +b4_copyright([Position class for Bison C++ parsers], [2002, 2003, 2004])[ + +/** + ** \file position.hh + ** Define the Location class. + */ + +#ifndef BISON_POSITION_HH +# define BISON_POSITION_HH + +# include +# include + +namespace yy +{ + /// Abstract a Position. + class Position + { + public: + /// Initial column number. + static const unsigned int initial_column = 0; + /// Initial line number. + static const unsigned int initial_line = 1; + + /** \name Ctor & dtor. + ** \{ */ + public: + /// Construct a Position. + Position () : + filename (), + line (initial_line), + column (initial_column) + { + } + /** \} */ + + + /** \name Line and Column related manipulators + ** \{ */ + public: + /// (line related) Advance to the COUNT next lines. + inline void lines (int count = 1) + { + column = initial_column; + line += count; + } + + /// (column related) Advance to the COUNT next columns. + inline void columns (int count = 1) + { + int leftmost = initial_column; + int current = column; + if (leftmost <= current + count) + column += count; + else + column = initial_column; + } + /** \} */ + + public: + /// File name to which this position refers. + std::string filename; + /// Current line number. + unsigned int line; + /// Current column number. + unsigned int column; + }; + + /// Add and assign a Position. + inline const Position& + operator+= (Position& res, const int width) + { + res.columns (width); + return res; + } + + /// Add two Position objects. + inline const Position + operator+ (const Position& begin, const int width) + { + Position res = begin; + return res += width; + } + + /// Add and assign a Position. + inline const Position& + operator-= (Position& res, const int width) + { + return res += -width; + } + + /// Add two Position objects. + inline const Position + operator- (const Position& begin, const int width) + { + return begin + -width; + } + + /** \brief Intercept output stream redirection. + ** \param ostr the destination output stream + ** \param pos a reference to the Position to redirect + */ + inline std::ostream& + operator<< (std::ostream& ostr, const Position& pos) + { + if (!pos.filename.empty ()) + ostr << pos.filename << ':'; + return ostr << pos.line << '.' << pos.column; + } + +} +#endif // not BISON_POSITION_HH] @output location.hh -b4_copyright([2002, 2003])[ +b4_copyright([Location class for Bison C++ parsers], [2002, 2003, 2004])[ + +/** + ** \file location.hh + ** Define the Location class. + */ #ifndef BISON_LOCATION_HH # define BISON_LOCATION_HH +# include +# include +# include "position.hh" + namespace yy { - struct Position + + /// Abstract a Location. + class Location { - int line; - int column; + /** \name Ctor & dtor. + ** \{ */ + public: + /// Construct a Location. + Location (void) : + begin (), + end () + { + } + /** \} */ + + + /** \name Line and Column related manipulators + ** \{ */ + public: + /// Reset initial location to final location. + inline void step (void) + { + begin = end; + } + + /// Extend the current location to the COUNT next columns. + inline void columns (unsigned int count = 1) + { + end += count; + } + + /// Extend the current location to the COUNT next lines. + inline void lines (unsigned int count = 1) + { + end.lines (count); + } + /** \} */ + + + public: + /// Beginning of the located region. + Position begin; + /// End of the located region. + Position end; }; - struct Location + /// Join two Location objects to create a Location. + inline const Location operator+ (const Location& begin, const Location& end) { - Position first; - Position last; - }; + Location res = begin; + res.end = end.end; + return res; + } + + /// Add two Location objects. + inline const Location operator+ (const Location& begin, unsigned int width) + { + Location res = begin; + res.columns (width); + return res; + } + + /// Add and assign a Location. + inline Location& operator+= (Location& res, unsigned int width) + { + res.columns (width); + return res; + } + + /** \brief Intercept output stream redirection. + ** \param ostr the destination output stream + ** \param loc a reference to the Location to redirect + ** + ** Avoid duplicate information. + */ + inline std::ostream& operator<< (std::ostream& ostr, const Location& loc) + { + Position last = loc.end - 1; + ostr << loc.begin; + if (loc.begin.filename != last.filename) + ostr << '-' << last; + else if (loc.begin.line != last.line) + ostr << '-' << last.line << '.' << last.column; + else if (loc.begin.column != last.column) + ostr << '-' << last.column; + return ostr; + } + } #endif // not BISON_LOCATION_HH]