X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/3953ed882a03f0de8cbcc5543ac3cdf1bf5e3093..a6df593dfe9918e8d9bdf8f59c881e93d5d292e8:/data/glr.cc diff --git a/data/glr.cc b/data/glr.cc index 0a364dbf..ea04b28d 100644 --- a/data/glr.cc +++ b/data/glr.cc @@ -1,42 +1,74 @@ -m4_divert(-1) -*- C -*- + -*- C -*- # C++ GLR skeleton for Bison -# Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. +# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 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 . + + +# This skeleton produces a C++ class that encapsulates a C glr parser. +# This is in order to reduce the maintenance burden. The glr.c +# skeleton is clean and pure enough so that there are no real +# problems. The C++ interface is the same as that of lalr1.cc. In +# fact, glr.c can replace yacc.c without the user noticing any +# difference, and similarly for glr.cc replacing lalr1.cc. +# +# The passing of parse-params +# +# The additional arguments are stored as members of the parser +# object, yyparser. The C routines need to carry yyparser +# throughout the C parser; that easy: just let yyparser become an +# additional parse-param. But because the C++ skeleton needs to +# know the "real" original parse-param, we save them +# (b4_parse_param_orig). Note that b4_parse_param is overquoted +# (and c.m4 strips one level of quotes). This is a PITA, and +# explains why there are so many levels of quotes. +# +# The locations +# +# We use location.cc just like lalr1.cc, but because glr.c stores +# the locations in a (C++) union, the position and location classes +# must not have a constructor. Therefore, contrary to lalr1.cc, we +# must not define "b4_location_constructors". As a consequence the +# user must initialize the first positions (in particular the +# filename member). # We require a pure interface using locations. -m4_define([b4_location_flag], [1]) -m4_define([b4_pure], [1]) +m4_define([b4_locations_flag], [1]) +m4_define([b4_pure_flag], [1]) + +# The header is mandatory. +b4_defines_if([], + [b4_fatal([b4_skeleton[: using %%defines is mandatory]])]) m4_include(b4_pkgdatadir/[c++.m4]) m4_include(b4_pkgdatadir/[location.cc]) +m4_define([b4_parser_class_name], + [b4_percent_define_get([[parser_class_name]])]) + +# Save the parse parameters. +m4_define([b4_parse_param_orig], m4_defn([b4_parse_param])) + # b4_yy_symbol_print_generate # --------------------------- # Bypass the default implementation to generate the "yy_symbol_print" # and "yy_symbol_value_print" functions. m4_define([b4_yy_symbol_print_generate], -[b4_c_ansi_function_decl([yyerror], - [static void], - [[yy::b4_parser_class_name::location_type *yylocationp], [yylocationp]], - b4_parse_param, - [[const char* msg], [msg]])[ - +[[ /*--------------------. | Print this symbol. | `--------------------*/ @@ -45,27 +77,39 @@ m4_define([b4_yy_symbol_print_generate], [static void], [[FILE *], []], [[int yytype], [yytype]], - [[const yy::b4_parser_class_name::semantic_type *yyvaluep], - [yyvaluep]][]dnl -b4_location_if([, - [[const yy::b4_parser_class_name::location_type *yylocationp], - [yylocationp]]])[]dnl -m4_ifset([b4_parse_param], [, b4_parse_param]))[ + [[const b4_namespace_ref::b4_parser_class_name::semantic_type *yyvaluep], + [yyvaluep]], + [[const b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], + [yylocationp]], + b4_parse_param)[ { ]b4_parse_param_use[]dnl -[ yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_location_if([, yylocationp])[); +[ yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[); } ]]) -m4_prepend([b4_epilogue], -[[ + +# Declare yyerror. +m4_append([b4_post_prologue], +[b4_syncline([@oline@], [@ofile@]) + +b4_c_ansi_function_decl([yyerror], + [static void], + [[b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], [yylocationp]], + b4_parse_param, + [[const char* msg], [msg]])]) + + +# Define yyerror. +m4_append([b4_epilogue], +[b4_syncline([@oline@], [@ofile@])[ /*------------------. | Report an error. | `------------------*/ ]b4_c_ansi_function_def([yyerror], [static void], - [[yy::b4_parser_class_name::location_type *yylocationp], [yylocationp]], + [[b4_namespace_ref::b4_parser_class_name::location_type *yylocationp], [yylocationp]], b4_parse_param, [[const char* msg], [msg]])[ { @@ -74,14 +118,16 @@ m4_prepend([b4_epilogue], } -namespace yy -{ -]dnl Restore the actual parser params. -m4_popdef([b4_parse_param])dnl -[ - /// Build a parser object. - ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[) - : yycdebug_ (&std::cerr)]b4_parse_param_cons[ +]b4_namespace_open[ +]dnl In this section, the parse param are the original parse_params. +m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl +[ /// Build a parser object. + ]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[ { } @@ -102,7 +148,7 @@ m4_popdef([b4_parse_param])dnl inline void ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype, - const semantic_type* yyvaluep, const location_type* yylocationp) + const semantic_type* yyvaluep, const location_type* yylocationp) { /* Pacify ``unused variable'' warnings. */ YYUSE (yyvaluep); @@ -111,18 +157,18 @@ m4_popdef([b4_parse_param])dnl { ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl [ default: - break; + break; } } void ]b4_parser_class_name[::yy_symbol_print_ (int yytype, - const semantic_type* yyvaluep, const location_type* yylocationp) + const semantic_type* yyvaluep, const location_type* yylocationp) { *yycdebug_ << (yytype < YYNTOKENS ? "token" : "nterm") - << ' ' << yytname[yytype] << " (" - << *yylocationp << ": "; + << ' ' << yytname[yytype] << " (" + << *yylocationp << ": "; yy_symbol_value_print_ (yytype, yyvaluep, yylocationp); *yycdebug_ << ')'; } @@ -143,80 +189,61 @@ m4_popdef([b4_parse_param])dnl ]b4_parser_class_name[::debug_level_type ]b4_parser_class_name[::debug_level () const { - return ::yydebug; + return yydebug_; } void ]b4_parser_class_name[::set_debug_level (debug_level_type l) { - ::yydebug = l; + yydebug_ = l; } -#endif /* ! YYDEBUG */ - -} // namespace yy +#endif +]m4_popdef([b4_parse_param])dnl +b4_namespace_close[ ]]) -# Let glr.c believe that the user arguments are only the parser itself. -m4_pushdef([b4_parse_param], - [[yy::b4_parser_class_name& yyparser, yyparser],] - m4_defn([b4_parse_param])) + +# Let glr.c believe that the user arguments include the parser itself. +m4_ifset([b4_parse_param], +[m4_pushdef([b4_parse_param], + m4_dquote([[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]],] +m4_defn([b4_parse_param])))], +[m4_pushdef([b4_parse_param], + [[[[b4_namespace_ref::b4_parser_class_name& yyparser], [[yyparser]]]]]) +]) m4_include(b4_pkgdatadir/[glr.c]) -@output @output_header_name@ -b4_copyright([C++ Skeleton parser for GLALR(1) parsing with Bison], - [2002, 2003, 2004, 2005])[ +m4_popdef([b4_parse_param]) + +m4_divert_push(0) +@output(b4_spec_defines_file@) +b4_copyright([Skeleton interface for Bison GLR parsers in C++], + [2002, 2003, 2004, 2005, 2006])[ /* C++ GLR parser skeleton written by Akim Demaille. */ #ifndef PARSER_HEADER_H # define PARSER_HEADER_H +]b4_percent_code_get([[requires]])[ + #include #include /* Using locations. */ #define YYLSP_NEEDED ]b4_locations_flag[ -namespace yy -{ +]b4_namespace_open[ class position; class location; -} - -/* Copy the first part of user declarations. */ -]b4_pre_prologue[ - -]/* Line __line__ of glr.cc. */ -b4_syncline([@oline@], [@ofile@])[ +]b4_namespace_close[ #include "location.hh" /* Enabling traces. */ #ifndef YYDEBUG -# define YYDEBUG ]b4_debug[ -#endif - -/* Enabling verbose error messages. */ -#ifdef YYERROR_VERBOSE -# undef YYERROR_VERBOSE -# define YYERROR_VERBOSE 1 -#else -# define YYERROR_VERBOSE ]b4_error_verbose[ -#endif - -/* Enabling the token table. */ -#ifndef YYTOKEN_TABLE -# define YYTOKEN_TABLE ]b4_token_table[ -#endif - -#if 0 -/* Copy the second part of user declarations. */ -]b4_post_prologue[ - -]/* Line __line__ of glr.cc. */ - -b4_syncline([@oline@], [@ofile@])[ +# define YYDEBUG ]b4_debug_flag[ #endif /* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N]. @@ -238,30 +265,33 @@ b4_syncline([@oline@], [@ofile@])[ while (/*CONSTCOND*/ 0) #endif -namespace yy -{ +]b4_namespace_open[ /// A Bison parser. class ]b4_parser_class_name[ { public: /// Symbol semantic values. -#if ! defined (YYSTYPE) +#ifndef YYSTYPE ]m4_ifdef([b4_stype], -[b4_syncline([b4_stype_line], [b4_file_name]) - union semantic_type b4_stype; -/* Line __line__ of lalr1.cc. */ -b4_syncline([@oline@], [@ofile@])], -[ typedef int semantic_type;])[ +[ union 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 { ]b4_token_enums(b4_tokens)[ }; + /// Token type. + typedef token::yytokentype token_type; /// Build a parser object. ]b4_parser_class_name[ (]b4_parse_param_decl[); @@ -299,17 +329,20 @@ b4_syncline([@oline@], [@ofile@])], /// \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); + 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); + const semantic_type* yyvaluep, + const location_type* yylocationp); private: -#endif /* ! YYDEBUG */ + /* Debugging. */ + int yydebug_; + std::ostream* yycdebug_; +#endif /// \brief Reclaim the memory associated to a symbol. @@ -318,19 +351,27 @@ b4_syncline([@oline@], [@ofile@])], /// \param yyvaluep Its semantic value. /// \param yylocationp Its location. inline void yydestruct_ (const char* yymsg, - int yytype, - semantic_type* yyvaluep, - location_type* yylocationp); + int yytype, + semantic_type* yyvaluep, + location_type* yylocationp); - /* Debugging. */ - std::ostream* yycdebug_; ]b4_parse_param_vars[ }; ]dnl Redirections for glr.c. -[#define YYSTYPE yy::]b4_parser_class_name[::semantic_type -#define YYLTYPE yy::]b4_parser_class_name[::location_type +b4_percent_define_flag_if([[global_tokens_and_yystype]], +[b4_token_defines(b4_tokens)]) +[ +#ifndef YYSTYPE +# define YYSTYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type +#endif +#ifndef YYLTYPE +# define YYLTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type +#endif -} +]b4_namespace_close[ + +]b4_percent_code_get([[provides]])[]dnl -#endif /* ! defined PARSER_HEADER_H */] +[#endif /* ! defined PARSER_HEADER_H */] +m4_divert_pop(0)