X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/473013144def14af635adc1c47d3718d41ced23e..a5eb1ed262e86657c5af95e4a8eae258a2e49e4b:/data/lalr1.cc diff --git a/data/lalr1.cc b/data/lalr1.cc index 1d7b2431..b07cb193 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 @@ -114,13 +114,51 @@ m4_define([b4_cc_var_decls], m4_define([b4_cc_var_decl], [ $1;]) + +# b4_yysymprint_generate(FUNCTION-DECLARATOR) +# ------------------------------------------- +# Generate the "symprint_" member function. +m4_define([b4_yysymprint_generate], +[[/*--------------------------------. +| Print this symbol on YYOUTPUT. | +`--------------------------------*/ + +]void +yy::b4_parser_class_name::symprint_ (int yytype, const SemanticType *yyvaluep, const LocationType *yylocationp)[ +{ + /* Pacify ``unused variable'' warnings. */ + (void) yyvaluep; + (void) yylocationp; + + cdebug_ << (yytype < ntokens_ ? "token" : "nterm") + << ' ' << name_[yytype] << " ("; + switch (yytype) + { +]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl +[ default: + break; + } + cdebug_ << ')'; +} +]]) + + +# b4_cxx_destruct_def(IGNORED-ARGUMENTS) +# -------------------------------------- +# Declare the destruct_ method. +m4_define([b4_cxx_destruct_def], +[void +yy::b4_parser_class_name::destruct_ (int yytype, SemanticType *yyvaluep, LocationType *yylocationp)[]dnl +]) + + # We do want M4 expansion after # for CPP macros. m4_changecom() 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 @@ -153,7 +191,9 @@ b4_syncline([@oline@], [@ofile@])[ # define YYERROR_VERBOSE ]b4_error_verbose[ #endif -#ifndef YYSTYPE +#ifdef YYSTYPE +typedef YYSTYPE yystype; +#else ]m4_ifdef([b4_stype], [b4_syncline([b4_stype_line], [b4_filename]) typedef union b4_stype yystype; @@ -234,6 +274,13 @@ namespace yy virtual void lex_ (); virtual void error_ (); virtual void print_ (); + virtual void report_syntax_error_ (); +#if YYDEBUG + virtual void symprint_ (int yytype, + const SemanticType *yyvaluep, + const LocationType *yylocationp); +#endif /* ! YYDEBUG */ + /* Stacks. */ StateStack state_stack_; @@ -249,6 +296,7 @@ namespace yy static const ]b4_int_type_for([b4_table])[ table_[]; 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_[]; @@ -261,12 +309,15 @@ 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 reduce_print_ (int yyrule); + virtual void stack_print_ (); #endif /* Even more tables. */ static inline TokenNumberType translate_ (int token); + static inline void destruct_ (int yytype, SemanticType *yyvaluep, + LocationType *yylocationp); /* Constants. */ static const int eof_; @@ -278,7 +329,7 @@ namespace yy static const int terror_; static const int errcode_; static const int ntokens_; - static const unsigned user_token_number_max_; + static const unsigned int user_token_number_max_; static const TokenNumberType undef_token_; /* State. */ @@ -286,20 +337,26 @@ namespace yy int len_; int state_; + /* Error handling. */ + int nerrs_; + int errstatus_; + /* Debugging. */ int debug_; std::ostream &cdebug_; - /* 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 and location of look-ahead token. */ SemanticType value; LocationType location; + /* Beginning of the last erroneous token popped off. */ + Position error_start_; /* @@$ and $$. */ SemanticType yyval; @@ -315,27 +372,43 @@ 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@])[ /* Enable debugging if requested. */ #if YYDEBUG # define YYCDEBUG if (debug_) cdebug_ +# define YY_REDUCE_PRINT(Rule) \ +do { \ + if (debug_) \ + reduce_print_ (Rule); \ +} while (0) +# define YY_STACK_PRINT() \ +do { \ + if (debug_) \ + stack_print_ (); \ +} while (0) #else /* !YYDEBUG */ # define YYCDEBUG if (0) cdebug_ +# 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 +]b4_yysymprint_generate([b4_cxx_symprint_def])[ +#endif /* ! YYDEBUG */ +]b4_yydestruct_generate([b4_cxx_destruct_def])[ int yy::]b4_parser_class_name[::parse () { - int nerrs = 0; - int errstatus = 0; + nerrs_ = 0; + errstatus_ = 0; /* Initialize the stacks. The initial state will be pushed in yynewstate, since the latter expects the semantical and the @@ -362,12 +435,12 @@ yy::]b4_parser_class_name[::parse () /* Backup. */ 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: "; @@ -387,15 +460,14 @@ yy::]b4_parser_class_name[::parse () #if YYDEBUG if (debug_) { - YYCDEBUG << "Next token is " << looka_ - << " (" << name_[ilooka_]; - print_ (); - YYCDEBUG << ')' << std::endl; + cdebug_ << "Next token is "; + symprint_ (ilooka_, &value, &location); + cdebug_ << std::endl; } #endif } - /* If the proper action on seeing token YYTOKEN is to reduce or to + /* 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_) @@ -420,7 +492,7 @@ yy::]b4_parser_class_name[::parse () if (n_ == final_) goto yyacceptlab; - /* Shift the lookahead token. */ + /* Shift the look-ahead token. */ #if YYDEBUG YYCDEBUG << "Shifting token " << looka_ << " (" << name_[ilooka_] << "), "; @@ -435,8 +507,8 @@ 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; @@ -472,28 +544,12 @@ yy::]b4_parser_class_name[::parse () yyloc = location_stack_[0]; } -#if YYDEBUG - if (debug_) - { - // Short files will use "unsigned char" for line numbers, - // in which case they will be output as character litterals - // by "<<". - unsigned yylno = rline_[n_]; - YYCDEBUG << "Reducing via 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 - if (len_) { Slice< LocationType, LocationStack > slice (location_stack_, len_); YYLLOC_DEFAULT (yyloc, slice, len_); } - + YY_REDUCE_PRINT (n_); switch (n_) { ]b4_actions[ @@ -506,16 +562,7 @@ b4_syncline([@oline@], [@ofile@])[ semantic_stack_.pop (len_); location_stack_.pop (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); @@ -534,48 +581,12 @@ b4_syncline([@oline@], [@ofile@])[ `------------------------------------*/ yyerrlab: /* If not already recovering from an error, report this error. */ - if (!errstatus) - { - ++nerrs; + report_syntax_error_ (); -#if YYERROR_VERBOSE - n_ = pact_[state_]; - if (pact_ninf_ < n_ && n_ < last_) - { - message = "syntax error, unexpected "; - message += name_[ilooka_]; - { - int count = 0; - /* Start YYX at -YYN if negative to avoid negative indexes in - YYCHECK. */ - int xbegin = n_ < 0 ? -n_ : 0; - /* Stay within bounds of both yycheck and yytname. */ - int checklim = last_ - n_; - int xend = checklim < ntokens_ ? checklim : ntokens_; - for (int x = xbegin; x < xend; ++x) - if (check_[x + n_] == x && x != terror_) - ++count; - if (count < 5) - { - count = 0; - for (int x1 = xbegin; x1 < xend; ++x1) - if (check_[x1 + n_] == x1 && x1 != terror_) - { - message += (!count++) ? ", expecting " : " or "; - message += name_[x1]; - } - } - } - } - else -#endif - message = "syntax error"; - error_ (); - } - - if (errstatus == 3) + error_start_ = location.begin; + 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. */ @@ -586,27 +597,43 @@ b4_syncline([@oline@], [@ofile@])[ if (looka_ == eof_) for (;;) { + error_start_ = location_stack_[0].begin; state_stack_.pop (); semantic_stack_.pop (); location_stack_.pop (); if (state_stack_.height () == 1) YYABORT; -// YYDSYMPRINTF ("Error: popping", yystos[*yyssp], yyvsp, yylsp); -// FIXME: yydestruct (yystos[*yyssp], yyvsp]b4_location_if([, yylsp])[); +#if YYDEBUG + if (debug_) + { + cdebug_ << "Error: popping "; + symprint_ (stos_[state_stack_[0]], + &semantic_stack_[0], + &location_stack_[0]); + cdebug_ << std::endl; + } +#endif // YYDEBUG + destruct_ (stos_[state_stack_[0]], + &semantic_stack_[0], + &location_stack_[0]); } } else { #if YYDEBUG - YYCDEBUG << "Discarding token " << looka_ - << " (" << name_[ilooka_] << ")." << std::endl; -// yydestruct (yytoken, &yylval]b4_location_if([, &yylloc])[); + if (debug_) + { + cdebug_ << "Error: discarding "; + symprint_ (ilooka_, &value, &location); + cdebug_ << std::endl; + } #endif - looka_ = empty_; + destruct_ (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; @@ -616,8 +643,16 @@ b4_syncline([@oline@], [@ofile@])[ `---------------------------------------------------*/ 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 + state_stack_.pop (len_); semantic_stack_.pop (len_); + error_start_ = location_stack_[len_ - 1].begin; location_stack_.pop (len_); state_ = state_stack_[0]; goto yyerrlab1; @@ -626,7 +661,7 @@ yyerrorlab: | yyerrlab1 -- common code for both syntax error and YYERROR. | `-------------------------------------------------------------*/ yyerrlab1: - errstatus = 3; /* Each real token shifted decrements this. */ + errstatus_ = 3; /* Each real token shifted decrements this. */ for (;;) { @@ -649,40 +684,19 @@ yyerrlab1: #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; - } + cdebug_ << "Error: popping "; + symprint_ (stos_[state_], &semantic_stack_[0], &location_stack_[0]); + cdebug_ << std::endl; } #endif + destruct_ (stos_[state_], &semantic_stack_[0], &location_stack_[0]); + error_start_ = location_stack_[0].begin; state_stack_.pop (); semantic_stack_.pop (); location_stack_.pop (); state_ = state_stack_[0]; - -#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 + YY_STACK_PRINT (); } if (n_ == final_) @@ -690,8 +704,13 @@ yyerrlab1: YYCDEBUG << "Shifting error token, "; - semantic_stack_.push (value); - location_stack_.push (location); + { + Location errloc; + errloc.begin = error_start_; + errloc.end = location.end; + semantic_stack_.push (value); + location_stack_.push (errloc); + } state_ = n_; goto yynewstate; @@ -715,6 +734,46 @@ yy::]b4_parser_class_name[::lex_ () #endif } +/** Generate an error message, and invoke yyerror. */ +void +yy::]b4_parser_class_name[::report_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(b4_pact_ninf, b4_pact_ninf) yy::b4_parser_class_name::pact_ninf_ = b4_pact_ninf[; @@ -764,7 +823,6 @@ 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])[ @@ -773,6 +831,7 @@ 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])[ @@ -798,7 +857,7 @@ 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_[] = { @@ -828,7 +887,33 @@ yy::]b4_parser_class_name[::rline_[] = { ]b4_rline[ }; -#endif + +/** Print the state stack from its BOTTOM up to its TOP (included). */ + +void +yy::]b4_parser_class_name[::stack_print_ () +{ + cdebug_ << "state stack now"; + for (StateStack::ConstIterator i = state_stack_.begin (); + i != state_stack_.end (); ++i) + cdebug_ << ' ' << *i; + cdebug_ << std::endl; +} + +/** Report that the YYRULE is going to be reduced. */ + +void +yy::]b4_parser_class_name[::reduce_print_ (int yyrule) +{ + unsigned int yylno = rline_[yyrule]; + /* Print the symbols being reduced, and their result. */ + cdebug_ << "Reducing via rule " << n_ - 1 << " (line " << yylno << "), "; + for (]b4_int_type_for([b4_prhs])[ i = prhs_[n_]; + 0 <= rhs_[i]; ++i) + cdebug_ << name_[rhs_[i]] << ' '; + cdebug_ << "-> " << name_[r1_[n_]] << std::endl; +} +#endif // YYDEBUG /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX. */ yy::]b4_parser_class_name[::TokenNumberType @@ -840,7 +925,7 @@ yy::]b4_parser_class_name[::translate_ (int token) { ]b4_translate[ }; - if ((unsigned) token <= user_token_number_max_) + if ((unsigned int) token <= user_token_number_max_) return translate_table[token]; else return undef_token_; @@ -855,13 +940,13 @@ 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 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([Stack handling for Bison C++ parsers], [2002, 2003])[ +b4_copyright([Stack handling for Bison C++ parsers], [2002, 2003, 2004])[ #ifndef BISON_STACK_HH # define BISON_STACK_HH @@ -882,20 +967,20 @@ namespace yy { } - Stack (unsigned n) : seq_ (n) + Stack (unsigned int n) : seq_ (n) { } inline T& - operator [] (unsigned i) + operator [] (unsigned int i) { return seq_[i]; } inline const T& - operator [] (unsigned i) const + operator [] (unsigned int i) const { return seq_[i]; } @@ -909,14 +994,14 @@ 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 (); @@ -936,14 +1021,14 @@ namespace yy public: Slice (const S& stack, - unsigned range) : stack_ (stack), - range_ (range) + unsigned int range) : stack_ (stack), + range_ (range) { } inline const T& - operator [] (unsigned i) const + operator [] (unsigned int i) const { return stack_[range_ - i]; } @@ -951,14 +1036,14 @@ namespace yy 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])[ +b4_copyright([Position class for Bison C++ parsers], [2002, 2003, 2004])[ /** ** \file position.hh @@ -1071,7 +1156,7 @@ namespace yy } #endif // not BISON_POSITION_HH] @output location.hh -b4_copyright([Location class for Bison C++ parsers], [2002, 2003])[ +b4_copyright([Location class for Bison C++ parsers], [2002, 2003, 2004])[ /** ** \file location.hh @@ -1142,7 +1227,7 @@ namespace yy } /** \brief Add two Location objects */ - inline const Location operator+ (const Location& begin, unsigned width) + inline const Location operator+ (const Location& begin, unsigned int width) { Location res = begin; res.columns (width); @@ -1150,7 +1235,7 @@ namespace yy } /** \brief Add and assign a Location */ - inline Location &operator+= (Location& res, unsigned width) + inline Location &operator+= (Location& res, unsigned int width) { res.columns (width); return res;