← Back
Editing: c++.m4
-*- Autoconf -*- # C++ skeleton for Bison # Copyright (C) 2002-2015 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 # 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, see <http://www.gnu.org/licenses/>. # Sanity checks, before defaults installed by c.m4. b4_percent_define_ifdef([[api.value.union.name]], [b4_complain_at(b4_percent_define_get_loc([[api.value.union.name]]), [named %union is invalid in C++])]) m4_include(b4_pkgdatadir/[c.m4]) # b4_comment(TEXT, [PREFIX]) # -------------------------- # Put TEXT in comment. Prefix all the output lines with PREFIX. m4_define([b4_comment], [b4_comment_([$1], [$2// ], [$2// ])]) ## -------- ## ## Checks. ## ## -------- ## b4_percent_define_check_kind([api.namespace], [code], [deprecated]) b4_percent_define_check_kind([parser_class_name], [code], [deprecated]) ## ---------------- ## ## Default values. ## ## ---------------- ## b4_percent_define_default([[parser_class_name]], [[parser]]) # Don't do that so that we remember whether we're using a user # request, or the default value. # # b4_percent_define_default([[api.location.type]], [[location]]) b4_percent_define_default([[filename_type]], [[std::string]]) # Make it a warning for those who used betas of Bison 3.0. b4_percent_define_default([[api.namespace]], m4_defn([b4_prefix])) b4_percent_define_default([[global_tokens_and_yystype]], [[false]]) b4_percent_define_default([[define_location_comparison]], [m4_if(b4_percent_define_get([[filename_type]]), [std::string], [[true]], [[false]])]) ## ----------- ## ## Namespace. ## ## ----------- ## m4_define([b4_namespace_ref], [b4_percent_define_get([[api.namespace]])]) # Don't permit an empty b4_namespace_ref. Any '::parser::foo' appended to it # would compile as an absolute reference with 'parser' in the global namespace. # b4_namespace_open would open an anonymous namespace and thus establish # internal linkage. This would compile. However, it's cryptic, and internal # linkage for the parser would be specified in all translation units that # include the header, which is always generated. If we ever need to permit # internal linkage somehow, surely we can find a cleaner approach. m4_if(m4_bregexp(b4_namespace_ref, [^[ ]*$]), [-1], [], [b4_complain_at(b4_percent_define_get_loc([[api.namespace]]), [[namespace reference is empty]])]) # Instead of assuming the C++ compiler will do it, Bison should reject any # invalid b4_namepsace_ref that would be converted to a valid # b4_namespace_open. The problem is that Bison doesn't always output # b4_namespace_ref to uncommented code but should reserve the ability to do so # in future releases without risking breaking any existing user grammars. # Specifically, don't allow empty names as b4_namespace_open would just convert # those into anonymous namespaces, and that might tempt some users. m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*::]), [-1], [], [b4_complain_at(b4_percent_define_get_loc([[api.namespace]]), [[namespace reference has consecutive "::"]])]) m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*$]), [-1], [], [b4_complain_at(b4_percent_define_get_loc([[api.namespace]]), [[namespace reference has a trailing "::"]])]) m4_define([b4_namespace_open], [b4_user_code([b4_percent_define_get_syncline([[api.namespace]]) [namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref), [^\(.\)[ ]*::], [\1])), [::], [ { namespace ])[ {]])]) m4_define([b4_namespace_close], [b4_user_code([b4_percent_define_get_syncline([[api.namespace]]) m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]), [^\(.\)[ ]*\(::\)?\([^][:]\|:[^:]\)*], [\1])), [::\([^][:]\|:[^:]\)*], [} ])[} // ]b4_namespace_ref])]) # b4_token_enums # -------------- # Output the definition of the tokens as enums. m4_define([b4_token_enums], [[enum yytokentype { ]m4_join([, ], b4_symbol_map([b4_token_enum]))[ };]dnl ]) ## ----------------- ## ## Semantic Values. ## ## ----------------- ## # b4_value_type_declare # --------------------- # Declare semantic_type. m4_define([b4_value_type_declare], [b4_value_type_setup[]dnl [ /// Symbol semantic values. ]m4_bmatch(b4_percent_define_get_kind([[api.value.type]]), [code], [[ typedef ]b4_percent_define_get([[api.value.type]])[ semantic_type;]], [m4_bmatch(b4_percent_define_get([[api.value.type]]), [union\|union-directive], [[ union semantic_type { ]b4_user_union_members[ };]])])dnl ]) # b4_public_types_declare # ----------------------- # Define the public types: token, semantic value, location, and so forth. # Depending on %define token_lex, may be output in the header or source file. m4_define([b4_public_types_declare], [[#ifndef ]b4_api_PREFIX[STYPE ]b4_value_type_declare[ #else typedef ]b4_api_PREFIX[STYPE semantic_type; #endif]b4_locations_if([ /// Symbol locations. typedef b4_percent_define_get([[api.location.type]], [[location]]) location_type;])[ /// Syntax errors thrown from user actions. struct syntax_error : std::runtime_error { syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m);]b4_locations_if([ location_type location;])[ }; /// Tokens. struct token { ]b4_token_enums[ }; /// (External) token type, as returned by yylex. typedef token::yytokentype token_type; /// Symbol type: an internal symbol number. typedef int symbol_number_type; /// The symbol type number to denote an empty symbol. enum { empty_symbol = -2 }; /// Internal symbol number for tokens (subsumed by symbol_number_type). typedef ]b4_int_type_for([b4_translate])[ token_number_type; /// A complete symbol. /// /// Expects its Base type to provide access to the symbol type /// via type_get(). /// /// Provide access to semantic value]b4_locations_if([ and location])[. template <typename Base> struct basic_symbol : Base { /// Alias to Base. typedef Base super_type; /// Default constructor. basic_symbol (); /// Copy constructor. basic_symbol (const basic_symbol& other); ]b4_variant_if([[ /// Constructor for valueless symbols, and symbols from each type. ]b4_type_foreach([b4_basic_symbol_constructor_declare])], [[ /// Constructor for valueless symbols. basic_symbol (typename Base::kind_type t]b4_locations_if([, const location_type& l])[);]])[ /// Constructor for symbols with semantic value. basic_symbol (typename Base::kind_type t, const semantic_type& v]b4_locations_if([, const location_type& l])[); /// Destroy the symbol. ~basic_symbol (); /// Destroy contents, and record that is empty. void clear (); /// Whether empty. bool empty () const; /// Destructive move, \a s is emptied into this. void move (basic_symbol& s); /// The semantic value. semantic_type value;]b4_locations_if([ /// The location. location_type location;])[ private: /// Assignment operator. basic_symbol& operator= (const basic_symbol& other); }; /// Type access provider for token (enum) based symbols. struct by_type { /// Default constructor. by_type (); /// Copy constructor. by_type (const by_type& other); /// The symbol type as needed by the constructor. typedef token_type kind_type; /// Constructor from (external) token numbers. by_type (kind_type t); /// Record that this symbol is empty. void clear (); /// Steal the symbol type from \a that. void move (by_type& that); /// The (internal) type number (corresponding to \a type). /// \a empty when empty. symbol_number_type type_get () const; /// The token. token_type token () const; /// The symbol type. /// \a empty_symbol when empty. /// An int, not token_number_type, to be able to store empty_symbol. int type; }; /// "External" symbols: returned by the scanner. typedef basic_symbol<by_type> symbol_type; ]b4_symbol_constructor_declare]) # b4_public_types_define # ---------------------- # Provide the implementation needed by the public types. m4_define([b4_public_types_define], [[ inline ]b4_parser_class_name[::syntax_error::syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m) : std::runtime_error (m)]b4_locations_if([ , location (l)])[ {} // basic_symbol. template <typename Base> inline ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol () : value () {} template <typename Base> inline ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (const basic_symbol& other) : Base (other) , value ()]b4_locations_if([ , location (other.location)])[ { ]b4_variant_if([b4_symbol_variant([other.type_get ()], [value], [copy], [other.value])], [value = other.value;])[ } template <typename Base> inline ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (]b4_join( [typename Base::kind_type t], [const semantic_type& v], b4_locations_if([const location_type& l]))[) : Base (t) , value (]b4_variant_if([], [v])[)]b4_locations_if([ , location (l)])[ {]b4_variant_if([[ (void) v; ]b4_symbol_variant([this->type_get ()], [value], [copy], [v])])[} ]b4_variant_if([[ // Implementation of basic_symbol constructor for each type. ]b4_type_foreach([b4_basic_symbol_constructor_define])], [[ /// Constructor for valueless symbols. template <typename Base> inline ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (]b4_join( [typename Base::kind_type t], b4_locations_if([const location_type& l]))[) : Base (t) , value ()]b4_locations_if([ , location (l)])[ {}]])[ template <typename Base> inline ]b4_parser_class_name[::basic_symbol<Base>::~basic_symbol () { clear (); } template <typename Base> inline void ]b4_parser_class_name[::basic_symbol<Base>::clear () {]b4_variant_if([[ // User destructor. symbol_number_type yytype = this->type_get (); basic_symbol<Base>& yysym = *this; (void) yysym; switch (yytype) { ]b4_symbol_foreach([b4_symbol_destructor])dnl [ default: break; } // Type destructor. ]b4_symbol_variant([[yytype]], [[value]], [[template destroy]])])[ Base::clear (); } template <typename Base> inline bool ]b4_parser_class_name[::basic_symbol<Base>::empty () const { return Base::type_get () == empty_symbol; } template <typename Base> inline void ]b4_parser_class_name[::basic_symbol<Base>::move (basic_symbol& s) { super_type::move(s); ]b4_variant_if([b4_symbol_variant([this->type_get ()], [value], [move], [s.value])], [value = s.value;])[]b4_locations_if([ location = s.location;])[ } // by_type. inline ]b4_parser_class_name[::by_type::by_type () : type (empty_symbol) {} inline ]b4_parser_class_name[::by_type::by_type (const by_type& other) : type (other.type) {} inline ]b4_parser_class_name[::by_type::by_type (token_type t) : type (yytranslate_ (t)) {} inline void ]b4_parser_class_name[::by_type::clear () { type = empty_symbol; } inline void ]b4_parser_class_name[::by_type::move (by_type& that) { type = that.type; that.clear (); } inline int ]b4_parser_class_name[::by_type::type_get () const { return type; } ]b4_token_ctor_if([[ inline ]b4_parser_class_name[::token_type ]b4_parser_class_name[::by_type::token () const { // YYTOKNUM[NUM] -- (External) token number corresponding to the // (internal) symbol number NUM (which must be that of a token). */ static const ]b4_int_type_for([b4_toknum])[ yytoken_number_[] = { ]b4_toknum[ }; return static_cast<token_type> (yytoken_number_[type]); } ]])[]dnl b4_symbol_constructor_define]) # b4_symbol_constructor_declare # b4_symbol_constructor_define # ----------------------------- # Declare/define symbol constructors for all the value types. # Use at class-level. Redefined in variant.hh. m4_define([b4_symbol_constructor_declare], []) m4_define([b4_symbol_constructor_define], []) # b4_yytranslate_define # --------------------- # Define yytranslate_. Sometimes used in the header file, # sometimes in the cc file. m4_define([b4_yytranslate_define], [[ // Symbol number corresponding to token number t. inline ]b4_parser_class_name[::token_number_type ]b4_parser_class_name[::yytranslate_ (]b4_token_ctor_if([token_type], [int])[ t) { static const token_number_type translate_table[] = { ]b4_translate[ }; const unsigned int user_token_number_max_ = ]b4_user_token_number_max[; const token_number_type undef_token_ = ]b4_undef_token_number[; if (static_cast<int>(t) <= yyeof_) return yyeof_; else if (static_cast<unsigned int> (t) <= user_token_number_max_) return translate_table[t]; else return undef_token_; } ]]) # b4_lhs_value([TYPE]) # -------------------- # Expansion of $<TYPE>$. m4_define([b4_lhs_value], [b4_symbol_value([yyval], [$1])]) # b4_rhs_value(RULE-LENGTH, NUM, [TYPE]) # -------------------------------------- # Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH # symbols on RHS. m4_define([b4_rhs_value], [b4_symbol_value([yysemantic_stack_@{($1) - ($2)@}], [$3])]) # b4_lhs_location() # ----------------- # Expansion of @$. m4_define([b4_lhs_location], [(yyloc)]) # b4_rhs_location(RULE-LENGTH, NUM) # --------------------------------- # Expansion of @NUM, where the current rule has RULE-LENGTH symbols # on RHS. m4_define([b4_rhs_location], [(yylocation_stack_@{($1) - ($2)@})]) # 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;]) ## ---------## ## Values. ## ## ---------## # b4_yylloc_default_define # ------------------------ # Define YYLLOC_DEFAULT. m4_define([b4_yylloc_default_define], [[/* 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) \ do \ if (N) \ { \ (Current).begin = YYRHSLOC (Rhs, 1).begin; \ (Current).end = YYRHSLOC (Rhs, N).end; \ } \ else \ { \ (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end; \ } \ while (/*CONSTCOND*/ false) # endif ]]) ## -------- ## ## Checks. ## ## -------- ## b4_token_ctor_if([b4_variant_if([], [b4_fatal_at(b4_percent_define_get_loc(api.token.constructor), [cannot use '%s' without '%s'], [%define api.token.constructor], [%define api.value.type variant]))])])
Save File
Cancel