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98c4f1bbeb
This version is required by upstream ANGLE. win_bison conveniently uses a different executable name as the existing bison copy, avoiding conflicts. Change-Id: I2897ce97aef6795933d3ab8b5570a8494a55523e Reviewed-by: Lars Knoll <lars.knoll@digia.com>
346 lines
11 KiB
C++
346 lines
11 KiB
C++
# C++ GLR skeleton for Bison
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# Copyright (C) 2002-2013 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This skeleton produces a C++ class that encapsulates a C glr parser.
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# This is in order to reduce the maintenance burden. The glr.c
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# skeleton is clean and pure enough so that there are no real
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# problems. The C++ interface is the same as that of lalr1.cc. In
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# fact, glr.c can replace yacc.c without the user noticing any
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# difference, and similarly for glr.cc replacing lalr1.cc.
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#
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# The passing of parse-params
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#
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# The additional arguments are stored as members of the parser
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# object, yyparser. The C routines need to carry yyparser
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# throughout the C parser; that's easy: make yyparser an
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# additional parse-param. But because the C++ skeleton needs to
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# know the "real" original parse-param, we save them
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# (b4_parse_param_orig). Note that b4_parse_param is overquoted
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# (and c.m4 strips one level of quotes). This is a PITA, and
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# explains why there are so many levels of quotes.
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#
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# The locations
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#
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# We use location.cc just like lalr1.cc, but because glr.c stores
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# the locations in a union, the position and location classes
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# must not have a constructor. Therefore, contrary to lalr1.cc, we
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# must not define "b4_location_constructors". As a consequence the
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# user must initialize the first positions (in particular the
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# filename member).
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# We require a pure interface.
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m4_define([b4_pure_flag], [1])
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m4_include(b4_pkgdatadir/[c++.m4])
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b4_bison_locations_if([m4_include(b4_pkgdatadir/[location.cc])])
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m4_define([b4_parser_class_name],
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[b4_percent_define_get([[parser_class_name]])])
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# Save the parse parameters.
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m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
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# b4_parse_param_wrap
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# -------------------
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# New ones.
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m4_ifset([b4_parse_param],
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[m4_define([b4_parse_param_wrap],
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[[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]],]
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m4_defn([b4_parse_param]))],
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[m4_define([b4_parse_param_wrap],
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[[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]]])
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])
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# b4_yy_symbol_print_define
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# -------------------------
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# Bypass the default implementation to generate the "yy_symbol_print"
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# and "yy_symbol_value_print" functions.
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m4_define([b4_yy_symbol_print_define],
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[[
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/*--------------------.
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| Print this symbol. |
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`--------------------*/
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]b4_function_define([yy_symbol_print],
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[static void],
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[[FILE *], []],
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[[int yytype], [yytype]],
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[[const ]b4_namespace_ref::b4_parser_class_name[::semantic_type *yyvaluep],
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[yyvaluep]][]dnl
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b4_locations_if([,
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[[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
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[yylocationp]]]),
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b4_parse_param)[
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{
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]b4_parse_param_use[]dnl
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[ yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[);
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}
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]])[
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# Hijack the initial action to initialize the locations.
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]b4_bison_locations_if([m4_define([b4_initial_action],
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[yylloc.initialize ();]m4_ifdef([b4_initial_action], [
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m4_defn([b4_initial_action])]))])[
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# Hijack the post prologue to insert early definition of YYLLOC_DEFAULT
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# and declaration of yyerror.
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]m4_append([b4_post_prologue],
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[b4_syncline([@oline@], [@ofile@])[
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]b4_yylloc_default_define[
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#define YYRHSLOC(Rhs, K) ((Rhs)[K].yystate.yyloc)
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]b4_function_declare([yyerror],
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[static void],b4_locations_if([
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[[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
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[yylocationp]],])
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b4_parse_param,
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[[const char* msg], [msg]])])
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#undef yynerrs
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#undef yychar
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#undef yylval]b4_locations_if([
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#undef yylloc])
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m4_if(b4_prefix, [yy], [],
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[[/* Substitute the variable and function names. */
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#define yyparse ]b4_prefix[parse
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#define yylex ]b4_prefix[lex
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#define yyerror ]b4_prefix[error
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#define yydebug ]b4_prefix[debug
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]]b4_pure_if([], [[
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#define yylval ]b4_prefix[lval
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#define yychar ]b4_prefix[char
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#define yynerrs ]b4_prefix[nerrs]b4_locations_if([[
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#define yylloc ]b4_prefix[lloc]])]))
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# Hijack the epilogue to define implementations (yyerror, parser member
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# functions etc.).
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m4_append([b4_epilogue],
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[b4_syncline([@oline@], [@ofile@])[
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/*------------------.
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| Report an error. |
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`------------------*/
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]b4_function_define([yyerror],
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[static void],b4_locations_if([
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[[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
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[yylocationp]],])
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b4_parse_param,
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[[const char* msg], [msg]])[
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{
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]b4_parse_param_use[]dnl
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[ yyparser.error (]b4_locations_if([[*yylocationp, ]])[msg);
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}
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]b4_namespace_open[
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]dnl In this section, the parse params are the original parse_params.
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m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
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[ /// Build a parser object.
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]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
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:])[
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#if ]b4_api_PREFIX[DEBUG
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]m4_ifset([b4_parse_param], [ ], [ :])[yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
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#endif]b4_parse_param_cons[
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{
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}
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]b4_parser_class_name::~b4_parser_class_name[ ()
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{
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}
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int
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]b4_parser_class_name[::parse ()
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{
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return ::yyparse (*this]b4_user_args[);
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}
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#if ]b4_api_PREFIX[DEBUG
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/*--------------------.
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| Print this symbol. |
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`--------------------*/
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inline void
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]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
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const semantic_type* yyvaluep]b4_locations_if([[,
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const location_type* yylocationp]])[)
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{]b4_locations_if([[
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YYUSE (yylocationp);]])[
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YYUSE (yyvaluep);
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std::ostream& yyoutput = debug_stream ();
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std::ostream& yyo = yyoutput;
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YYUSE (yyo);
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]b4_symbol_actions([printer])[
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}
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void
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]b4_parser_class_name[::yy_symbol_print_ (int yytype,
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const semantic_type* yyvaluep]b4_locations_if([[,
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const location_type* yylocationp]])[)
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{
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*yycdebug_ << (yytype < YYNTOKENS ? "token" : "nterm")
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<< ' ' << yytname[yytype] << " ("]b4_locations_if([[
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<< *yylocationp << ": "]])[;
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yy_symbol_value_print_ (yytype, yyvaluep]b4_locations_if([[, yylocationp]])[);
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*yycdebug_ << ')';
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}
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std::ostream&
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]b4_parser_class_name[::debug_stream () const
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{
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return *yycdebug_;
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}
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void
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]b4_parser_class_name[::set_debug_stream (std::ostream& o)
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{
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yycdebug_ = &o;
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}
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]b4_parser_class_name[::debug_level_type
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]b4_parser_class_name[::debug_level () const
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{
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return yydebug;
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}
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void
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]b4_parser_class_name[::set_debug_level (debug_level_type l)
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{
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// Actually, it is yydebug which is really used.
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yydebug = l;
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}
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#endif
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]m4_popdef([b4_parse_param])dnl
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b4_namespace_close
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])
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# b4_shared_declarations
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# ----------------------
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# Declaration that might either go into the header (if --defines)
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# or open coded in the parser body.
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m4_define([b4_shared_declarations],
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[m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
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b4_percent_code_get([[requires]])[
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#include <stdexcept>
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#include <string>
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#include <iostream>]b4_defines_if([
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b4_bison_locations_if([[#include "location.hh"]])])[
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]b4_YYDEBUG_define[
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]b4_namespace_open[
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]b4_defines_if([],
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[b4_bison_locations_if([b4_position_define
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b4_location_define])])[
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/// A Bison parser.
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class ]b4_parser_class_name[
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{
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public:
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]b4_public_types_declare[
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/// Build a parser object.
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]b4_parser_class_name[ (]b4_parse_param_decl[);
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virtual ~]b4_parser_class_name[ ();
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/// Parse.
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/// \returns 0 iff parsing succeeded.
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virtual int parse ();
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/// The current debugging stream.
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std::ostream& debug_stream () const;
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/// Set the current debugging stream.
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void set_debug_stream (std::ostream &);
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/// Type for debugging levels.
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typedef int debug_level_type;
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/// The current debugging level.
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debug_level_type debug_level () const;
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/// Set the current debugging level.
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void set_debug_level (debug_level_type l);
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public:
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/// Report a syntax error.]b4_locations_if([[
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/// \param loc where the syntax error is found.]])[
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/// \param msg a description of the syntax error.
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virtual void error (]b4_locations_if([[const location_type& loc, ]])[const std::string& msg);
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# if ]b4_api_PREFIX[DEBUG
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public:
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/// \brief Report a symbol value on the debug stream.
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/// \param yytype The token type.
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/// \param yyvaluep Its semantic value.]b4_locations_if([[
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/// \param yylocationp Its location.]])[
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virtual void yy_symbol_value_print_ (int yytype,
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const semantic_type* yyvaluep]b4_locations_if([[,
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const location_type* yylocationp]])[);
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/// \brief Report a symbol on the debug stream.
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/// \param yytype The token type.
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/// \param yyvaluep Its semantic value.]b4_locations_if([[
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/// \param yylocationp Its location.]])[
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virtual void yy_symbol_print_ (int yytype,
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const semantic_type* yyvaluep]b4_locations_if([[,
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const location_type* yylocationp]])[);
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private:
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// Debugging.
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std::ostream* yycdebug_;
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#endif
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]b4_parse_param_vars[
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};
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]dnl Redirections for glr.c.
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b4_percent_define_flag_if([[global_tokens_and_yystype]],
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[b4_token_defines])
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[
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#ifndef ]b4_api_PREFIX[STYPE
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# define ]b4_api_PREFIX[STYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type
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#endif
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#ifndef ]b4_api_PREFIX[LTYPE
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# define ]b4_api_PREFIX[LTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type
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#endif
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]b4_namespace_close[
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]b4_percent_code_get([[provides]])[
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]m4_popdef([b4_parse_param])dnl
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])
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b4_defines_if(
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[b4_output_begin([b4_spec_defines_file])
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b4_copyright([Skeleton interface for Bison GLR parsers in C++],
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[2002-2013])[
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// C++ GLR parser skeleton written by Akim Demaille.
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]b4_cpp_guard_open([b4_spec_defines_file])[
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]b4_shared_declarations[
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]b4_cpp_guard_close([b4_spec_defines_file])[
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]b4_output_end()])
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# Let glr.c (and b4_shared_declarations) believe that the user
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# arguments include the parser itself.
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m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_wrap]))
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m4_include(b4_pkgdatadir/[glr.c])
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m4_popdef([b4_parse_param])
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