X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/6ed15cde294bb7503161e136371c6f36f51c6b3b..1d6b689b26f1939a31d082e94ce31d0a5e14853c:/data/lalr1.cc diff --git a/data/lalr1.cc b/data/lalr1.cc index 24b011bb..13a7e990 100644 --- a/data/lalr1.cc +++ b/data/lalr1.cc @@ -18,39 +18,39 @@ m4_include(b4_pkgdatadir/[c++.m4]) -# b4_table_define(TABLE-NAME, CONTENT) -# ------------------------------------ + +# b4_integral_parser_table_declare(TABLE-NAME, CONTENT, COMMENT) +# -------------------------------------------------------------- +# Declare "parser::yy_" which contents is CONTENT. +m4_define([b4_integral_parser_table_declare], +[m4_ifval([$3], [b4_c_comment([$3], [ ]) +])dnl + static const b4_int_type_for([$2]) yy$1_[[]];dnl +]) + +# b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT) +# --------------------------------------------- # Define "parser::yy_" which contents is CONTENT. -m4_define([b4_table_define], -[const b4_int_type_for([$2]) +m4_define([b4_integral_parser_table_define], +[ const b4_int_type_for([$2]) b4_parser_class_name::yy$1_[[]] = { $2 - }dnl + };dnl ]) + # b4_symbol_value_template(VAL, [TYPE]) # ------------------------------------- -# Same as b4_symbol_value, but used in a template method. +# Same as b4_symbol_value, but used in a template method. It makes +# a difference when using variants. m4_copy([b4_symbol_value], [b4_symbol_value_template]) -# How the semantic value is extracted when using variants. -b4_variant_if([ - # b4_symbol_value(VAL, [TYPE]) - # ---------------------------- - m4_define([b4_symbol_value], - [m4_ifval([$2], - [$1.as<$2>()], - [$1])]) - - # b4_symbol_value_template(VAL, [TYPE]) - # ------------------------------------- - # Same as b4_symbol_value, but used in a template method. - m4_define([b4_symbol_value_template], - [m4_ifval([$2], - [$1.template as<$2>()], - [$1])]) -]) # b4_variant_if + +# b4_lex_symbol_if([IF-YYLEX-RETURNS-A-COMPLETE-SYMBOL], [IF-NOT]) +# ---------------------------------------------------------------- +m4_define([b4_lex_symbol_if], +[b4_percent_define_ifdef([[lex_symbol]], [$1], [$2])]) # b4_assert_if([IF-ASSERTIONS-ARE-USED], [IF-NOT]) @@ -63,14 +63,14 @@ m4_define([b4_assert_if], # -------------------- # Expansion of $$. m4_define([b4_lhs_value], -[b4_symbol_value([yylhs.value], [$1])]) + [b4_symbol_value([yylhs.value], [$1])]) # b4_lhs_location() # ----------------- # Expansion of @$. m4_define([b4_lhs_location], -[yylhs.location]) + [yylhs.location]) # b4_rhs_data(RULE-LENGTH, NUM) @@ -78,11 +78,11 @@ m4_define([b4_lhs_location], # Return the data corresponding to the symbol #NUM, where the current # rule has RULE-LENGTH symbols on RHS. m4_define([b4_rhs_data], - [yystack_@{($1) - ($2)@}]) + [yystack_@{b4_subtract($@)@}]) # b4_rhs_state(RULE-LENGTH, NUM) -# ----------------------------- +# ------------------------------ # The state corresponding to the symbol #NUM, where the current # rule has RULE-LENGTH symbols on RHS. m4_define([b4_rhs_state], @@ -105,99 +105,109 @@ m4_define([b4_rhs_location], [b4_rhs_data([$1], [$2]).location]) -# b4_symbol(NUM, FIELD) -# --------------------- -# Recover a FIELD about symbol #NUM. Thanks to m4_indir, fails if -# undefined. -m4_define([b4_symbol], -[m4_indir([b4_symbol($1, $2)])]) - - -# b4_symbol_actions(FILENAME, LINENO, -# SYMBOL-TAG, SYMBOL-NUM, -# SYMBOL-ACTION, SYMBOL-TYPENAME) -# ------------------------------------------------- +# b4_symbol_action(SYMBOL-NUM, KIND) +# ---------------------------------- +# Run the action KIND (destructor or printer) for SYMBOL-NUM. # Same as in C, but using references instead of pointers. -m4_define([b4_symbol_actions], +m4_define([b4_symbol_action], +[b4_symbol_if([$1], [has_$2], [m4_pushdef([b4_dollar_dollar], - [b4_symbol_value_template([yysym.value], [$6])])dnl + [b4_symbol_value_template([yysym.value], + b4_symbol_if([$1], [has_type], + [b4_symbol([$1], [type])]))])dnl m4_pushdef([b4_at_dollar], [yysym.location])dnl - case $4: // $3 -b4_syncline([$2], [$1]) - $5; + b4_symbol_case_([$1]) +b4_syncline([b4_symbol([$1], [$2_line])], ["b4_symbol([$1], [$2_file])"]) + b4_symbol([$1], [$2]) b4_syncline([@oline@], [@ofile@]) break; + m4_popdef([b4_at_dollar])dnl m4_popdef([b4_dollar_dollar])dnl -]) +])]) +# b4_symbol_constructor_declaration_(SYMBOL-NUMBER) +# ------------------------------------------------- +# Declare the overloaded version of make_symbol for the (common) type of +# these SYMBOL-NUMBERS. Use at class-level. +m4_define([b4_symbol_constructor_declaration_], +[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id], +[ static inline + symbol_type + make_[]b4_symbol_([$1], [id]) (dnl +b4_args(b4_symbol_if([$1], [has_type], + [const b4_symbol([$1], [type])& v]), + b4_locations_if([const location_type& l]))); -# b4_symbol_case_(SYMBOL-NUM) -# --------------------------- -# Issue a "case NUM" for SYMBOL-NUM. -m4_define([b4_symbol_case_], -[ case b4_symbol([$1], [number]): // b4_symbol([$1], [tag]) -]) +])])]) -# b4_type_action_(NUMS) -# --------------------- -# Run actions for the symbol NUMS that all have the same type-name. -m4_define([b4_type_action_], -[m4_map([b4_symbol_case_], [$@])[]dnl - b4_dollar_dollar([b4_symbol([$1], [number])], - [b4_symbol([$1], [tag])], - [b4_symbol([$1], [type_name])]); - break; +# b4_symbol_constructor_declarations +# ---------------------------------- +# Declare symbol constructors for all the value types. +# Use at class-level. +m4_define([b4_symbol_constructor_declarations], +[b4_variant_if([ + // Symbol constructors declarations. +b4_symbol_foreach([b4_symbol_constructor_declaration_])])]) -]) -# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS]) +# b4_symbol_constructor_definition_(SYMBOL-NUMBER) # ------------------------------------------------ -# Run some ACTION ("build", or "destroy") on YYVAL of symbol type -# YYTYPE. -m4_define([b4_symbol_variant], -[m4_pushdef([b4_dollar_dollar], - [$2.$3<$][3>(m4_shift3($@))])dnl - switch ($1) - { -m4_map([b4_type_action_], m4_defn([b4_type_names]))[]dnl - default: - break; - } -m4_popdef([b4_dollar_dollar])dnl -]) +# Define symbol constructor for this SYMBOL-NUMBER. +m4_define([b4_symbol_constructor_definition_], +[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id], +[ b4_parser_class_name::symbol_type + b4_parser_class_name::make_[]b4_symbol_([$1], [id]) (dnl +b4_args(b4_symbol_if([$1], [has_type], + [const b4_symbol([$1], [type])& v]), + b4_locations_if([const location_type& l]))) + { + return symbol_type (b4_args([yytranslate_ (token::b4_symbol([$1], [id]))], + b4_symbol_if([$1], [has_type], [v]), + b4_locations_if([l]))); + } +])])]) -# _b4_char_sizeof_counter -# ----------------------- -# A counter used by _b4_char_sizeof_dummy to create fresh symbols. -m4_define([_b4_char_sizeof_counter], -[0]) -# _b4_char_sizeof_dummy -# --------------------- -# At each call return a new C++ identifier. -m4_define([_b4_char_sizeof_dummy], -[m4_define([_b4_char_sizeof_counter], m4_incr(_b4_char_sizeof_counter))dnl -dummy[]_b4_char_sizeof_counter]) +# b4_symbol_constructor_definitions +# ---------------------------------- +# Define the overloaded versions of make_symbol for all the value types. +m4_define([b4_symbol_constructor_definitions], +[b4_variant_if([ + // Implementation of make_symbol for each symbol type. +b4_symbol_foreach([b4_symbol_constructor_definition_])])]) -# b4_char_sizeof(SYMBOL-NUM) -# -------------------------- -# To be mapped on the list of type names to produce: -# -# char dummy1[sizeof(type_name_1)]; -# char dummy2[sizeof(type_name_2)]; -# -# for defined type names. -# $3 is doubly-quoted, do not quote it again. -m4_define([b4_char_sizeof], -[m4_ifval(b4_symbol([$1], [type_name]), -[ - char _b4_char_sizeof_dummy@{sizeof([b4_symbol([$1], [type_name])])@}; // b4_symbol([$1], [tag])])dnl -]) +# b4_yytranslate_definition +# ------------------------- +# Define yytranslate_. Sometimes we want it in the header file, +# sometimes the cc file suffices. +m4_define([b4_yytranslate_definition], +[[ // Symbol number corresponding to token number t. + ]b4_parser_class_name[::token_number_type + ]b4_parser_class_name[::yytranslate_ (]b4_lex_symbol_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(t) <= yyeof_) + return yyeof_; + else if (static_cast (t) <= user_token_number_max_) + return translate_table[t]; + else + return undef_token_; + } +]]) m4_pushdef([b4_copyright_years], @@ -210,15 +220,17 @@ m4_define([b4_parser_class_name], b4_defines_if([], [b4_fatal([b4_skeleton[: using %%defines is mandatory]])]) -# Backward compatibility. +b4_locations_if( +[# Backward compatibility. m4_define([b4_location_constructors]) -m4_include(b4_pkgdatadir/[location.cc]) +m4_include(b4_pkgdatadir/[location.cc])]) +m4_include(b4_pkgdatadir/[stack.hh]) +b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])]) # We do want M4 expansion after # for CPP macros. m4_changecom() m4_divert_push(0)dnl -b4_defines_if( -[@output(b4_spec_defines_file@)@ +@output(b4_spec_defines_file@)@ b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++]) dnl FIXME: This is wrong, we want computed header guards. [ @@ -235,99 +247,12 @@ dnl FIXME: This is wrong, we want computed header guards. #include "stack.hh" ]b4_namespace_open[ - class position; - class location; -]b4_variant_if( -[[ - /// A char[S] buffer to store and retrieve objects. - /// - /// Sort of a variant, but does not keep track of the nature - /// of the stored data, since that knowledge is available - /// via the current state. - template - struct variant - {]b4_assert_if([ - /// Whether something is contained. - bool built; - - /// Initially uninitialized. - variant () - : built(false) - {}])[ - - /// Instantiate a \a T in here. - template - inline T& - build() - {]b4_assert_if([ - assert(!built); - built = true;])[ - return *new (buffer) T; - } - - /// Instantiate a \a T in here from \a t. - template - inline T& - build(const T& t) - {]b4_assert_if([ - assert(!built); - built = true;])[ - return *new (buffer) T(t); - } - - /// Accessor to a built \a T. - template - inline T& - as() - {]b4_assert_if([ - assert(built);])[ - return reinterpret_cast(buffer); - } - - /// Const accessor to a built \a T (for %printer). - template - inline const T& - as() const - {]b4_assert_if([ - assert(built);])[ - return reinterpret_cast(buffer); - } - - /// Swap the content with \a other. - template - inline void - swap(variant& other) - { - std::swap(as(), other.as()); - } - - /// Assign the content of \a other to this. - /// Destroys \a other. - template - inline void - build(variant& other) - { - build(); - swap(other); - other.destroy(); - } - - /// Destroy the stored \a T. - template - inline void - destroy() - { - as().~T();]b4_assert_if([ - built = false;])[ - } - - /// A buffer large enough to store any of the semantic values. - char buffer[S]; - }; -]])[ +]b4_locations_if([ class position; + class location;])[ +]b4_variant_if([b4_variant_definition])[ ]b4_namespace_close[ -#include "location.hh" +]b4_locations_if([#include "location.hh"])[ /* Enabling traces. */ #ifndef YYDEBUG @@ -347,7 +272,8 @@ dnl FIXME: This is wrong, we want computed header guards. # define YYTOKEN_TABLE ]b4_token_table[ #endif -/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N]. +]b4_locations_if([dnl +[/* 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). */ @@ -364,7 +290,7 @@ do { \ (Current).begin = (Current).end = (Rhs)[0].location.end; \ } \ } while (false) -#endif +#endif]])[ ]b4_namespace_open[ @@ -372,36 +298,8 @@ do { \ class ]b4_parser_class_name[ { public: -#ifndef YYSTYPE -]b4_variant_if( -[ /// An auxiliary type to compute the largest semantic type. - union union_type - {]m4_map([b4_char_sizeof], m4_defn([b4_symbol_numbers]))[ - }; - - /// Symbol semantic values. - typedef variant semantic_type;], -[ /// Symbol semantic values. -m4_ifdef([b4_stype], -[ 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_percent_define_get([[location_type]])[ location_type; - /// Tokens. - struct token - { - ]b4_token_enums(b4_tokens)[ - }; - /// Token type. - typedef token::yytokentype token_type; - +]b4_public_types_declare[ +]b4_symbol_constructor_declarations[ /// Build a parser object. ]b4_parser_class_name[ (]b4_parse_param_decl[); virtual ~]b4_parser_class_name[ (); @@ -424,12 +322,12 @@ m4_ifdef([b4_stype], void set_debug_level (debug_level_type l); #endif - private: - /// Report a syntax error. - /// \param loc where the syntax error is found. + /// Report a syntax error.]b4_locations_if([ + /// \param loc where the syntax error is found.])[ /// \param msg a description of the syntax error. - virtual void error (const location_type& loc, const std::string& msg); + virtual void error (]b4_locations_if([const location_type& loc, ])[const std::string& msg); + private: /// Generate an error message. /// \param state the state where the error occurred. /// \param tok the lookahead token. @@ -440,52 +338,23 @@ m4_ifdef([b4_stype], /// Internal symbol numbers. typedef ]b4_int_type_for([b4_translate])[ token_number_type; - /* Tables. */ - /// For a state, the index in \a yytable_ of its portion. - static const ]b4_int_type_for([b4_pact])[ yypact_[]; static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_; - - /// For a state, default rule to reduce. - /// Unless\a yytable_ specifies something else to do. - /// Zero means the default is an error. - static const ]b4_int_type_for([b4_defact])[ yydefact_[]; - - static const ]b4_int_type_for([b4_pgoto])[ yypgoto_[]; - static const ]b4_int_type_for([b4_defgoto])[ yydefgoto_[]; - - /// What to do in a state. - /// \a yytable_[yypact_[s]]: what to do in state \a s. - /// - if positive, shift that token. - /// - if negative, reduce the rule which number is the opposite. - /// - if zero, do what YYDEFACT says. - static const ]b4_int_type_for([b4_table])[ yytable_[]; static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ yytable_ninf_; - static const ]b4_int_type_for([b4_check])[ yycheck_[]; - - /// For a state, its accessing symbol. - static const ]b4_int_type_for([b4_stos])[ yystos_[]; - - /// For a rule, its LHS. - static const ]b4_int_type_for([b4_r1])[ yyr1_[]; - /// For a rule, its RHS length. - static const ]b4_int_type_for([b4_r2])[ yyr2_[]; + /* Tables. */ +]b4_parser_tables_declare[ #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE /// For a symbol, its name in clear. static const char* const yytname_[]; -#endif +#endif]b4_error_verbose_if([ -#if YYERROR_VERBOSE /// Convert the symbol name \a n to a form suitable for a diagnostic. - virtual std::string yytnamerr_ (const char *n); -#endif + static std::string yytnamerr_ (const char *n);])[ #if YYDEBUG - /// For each rule, its source line number. - static const ]b4_int_type_for([b4_rline])[ yyrline_[]; - /// For each scanner token number, its symbol number. - static const ]b4_int_type_for([b4_toknum])[ yytoken_number_[]; +]b4_integral_parser_table_declare([rline], [b4_rline], + [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[ /// Report on the debug stream that the rule \a r is going to be reduced. virtual void yy_reduce_print_ (int r); /// Print the state stack on the debug stream. @@ -497,31 +366,7 @@ m4_ifdef([b4_stype], #endif /// Convert a scanner token number \a t to a symbol number. - static inline token_number_type yytranslate_ (int t); - - /// A complete symbol, with its type. - template - struct symbol_base_type - { - /// Default constructor. - inline symbol_base_type (); - - /// Constructor. - inline symbol_base_type (const semantic_type& v, const location_type& l); - - /// Return this with its exact type. - const Exact& self () const; - Exact& self (); - - /// Return the type of this symbol. - int type_get () const; - - /// The semantic value. - semantic_type value; - - /// The location. - location_type location; - }; + static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t); #if YYDEBUG /// \brief Display a symbol type, value and location. @@ -540,26 +385,7 @@ m4_ifdef([b4_stype], inline void yy_destroy_ (const char* yymsg, symbol_base_type& yysym) const; - /// Element of the stack: a state and its attributes. - struct symbol_type : symbol_base_type - { - /// The parent class. - typedef symbol_base_type super_type; - - /// Default constructor. - inline symbol_type (); - - /// Constructor. - inline symbol_type (int t, - const semantic_type& v, const location_type& l); - - /// The symbol type. - int type; - - /// Return the type corresponding to this state. - inline int type_get_ () const; - }; - + private: /// Element of the stack: a state and its attributes. struct stack_symbol_type : symbol_base_type { @@ -570,8 +396,9 @@ m4_ifdef([b4_stype], inline stack_symbol_type (); /// Constructor. - inline stack_symbol_type (state_type s, - const semantic_type& v, const location_type& l); + inline stack_symbol_type (]b4_args([state_type s], + [const semantic_type& v], + b4_locations_if([const location_type& l]))[); /// The state. state_type state; @@ -620,6 +447,9 @@ m4_ifdef([b4_stype], ]b4_parse_param_vars[ }; +]b4_lex_symbol_if([b4_yytranslate_definition +b4_public_types_define +b4_symbol_constructor_definitions])[ ]b4_namespace_close[ ]b4_percent_define_flag_if([[global_tokens_and_yystype]], @@ -633,7 +463,6 @@ m4_ifdef([b4_stype], b4_percent_code_get([[provides]])[]dnl [#endif /* ! defined PARSER_HEADER_H */] -])dnl @output(b4_parser_file_name@)@ b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++]) b4_percent_code_get([[top]])[]dnl @@ -643,10 +472,9 @@ m4_if(b4_prefix, [yy], [], #define yylex b4_prefix[]lex])[ /* First part of user declarations. */ -]b4_user_pre_prologue +]b4_user_pre_prologue[ -b4_defines_if([[ -#include "@basename(]b4_spec_defines_file[@)"]])[ +#include "@basename(]b4_spec_defines_file[@)" /* User implementation prologue. */ ]b4_user_post_prologue @@ -704,16 +532,15 @@ b4_percent_code_get[]dnl #endif /* !YYDEBUG */ -#define yyerrok (yyerrstatus_ = 0) -#define yyclearin (yychar = yyempty_) +#define yyerrok (yyerrstatus_ = 0) +#define yyclearin (yyempty = true) -#define YYACCEPT goto yyacceptlab -#define YYABORT goto yyabortlab -#define YYERROR goto yyerrorlab +#define YYACCEPT goto yyacceptlab +#define YYABORT goto yyabortlab +#define YYERROR goto yyerrorlab #define YYRECOVERING() (!!yyerrstatus_) -]b4_namespace_open[ -#if YYERROR_VERBOSE +]b4_namespace_open[]b4_error_verbose_if([[ /* Return YYSTR after stripping away unnecessary quotes and backslashes, so that it's suitable for yyerror. The heuristic is @@ -751,8 +578,7 @@ b4_percent_code_get[]dnl return yystr; } - -#endif +]])[ /// Build a parser object. ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [ @@ -773,61 +599,8 @@ b4_percent_code_get[]dnl | Symbol types. | `---------------*/ - // symbol_base_type. - template - ]b4_parser_class_name[::symbol_base_type::symbol_base_type () - : value() - , location() - { - } - - template - ]b4_parser_class_name[::symbol_base_type::symbol_base_type (const semantic_type& v, const location_type& l) - : value(v) - , location(l) - { - } - - template - const Exact& - ]b4_parser_class_name[::symbol_base_type::self () const - { - return static_cast(*this); - } - - template - Exact& - ]b4_parser_class_name[::symbol_base_type::self () - { - return static_cast(*this); - } - - template - int - ]b4_parser_class_name[::symbol_base_type::type_get () const - { - return self ().type_get_ (); - } - - // symbol_type. - ]b4_parser_class_name[::symbol_type::symbol_type () - : super_type () - , type () - { - } - - ]b4_parser_class_name[::symbol_type::symbol_type (int t, - const semantic_type& v, const location_type& l) - : super_type (v, l) - , type (t) - { - } - - int - ]b4_parser_class_name[::symbol_type::type_get_ () const - { - return type; - } +]b4_lex_symbol_if([], [b4_public_types_define +b4_symbol_constructor_definitions])[ // stack_symbol_type. ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type () @@ -836,9 +609,11 @@ b4_percent_code_get[]dnl { } - ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (state_type s, - const semantic_type& v, const location_type& l) - : super_type (v, l) + ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (]b4_args( + [state_type s], + [const semantic_type& v], + b4_locations_if([const location_type& l]))[) + : super_type (v]b4_locations_if([, l])[) , state (s) { } @@ -863,9 +638,9 @@ b4_percent_code_get[]dnl // User destructor. switch (yytype) { -]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[ - default: - break; +]b4_symbol_foreach([b4_symbol_destructor])dnl +[ default: + break; }]b4_variant_if([ // Type destructor. @@ -880,12 +655,12 @@ b4_percent_code_get[]dnl { int yytype = yysym.type_get (); yyo << (yytype < yyntokens_ ? "token" : "nterm") - << ' ' << yytname_[yytype] << " (" - << yysym.location << ": "; + << ' ' << yytname_[yytype] << " ("]b4_locations_if([ + << yysym.location << ": "])[; switch (yytype) { -]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))[ - default: +]b4_symbol_foreach([b4_symbol_printer])dnl +[ default: break; } yyo << ')'; @@ -899,10 +674,16 @@ b4_percent_code_get[]dnl if (m) YY_SYMBOL_PRINT (m, sym); ]b4_variant_if( -[[ yystack_.push (stack_symbol_type (s, semantic_type(), sym.location)); +[[ yystack_.push (stack_symbol_type (]b4_args( + [s], + [semantic_type()], + b4_locations_if([sym.location]))[)); ]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]], [build], [sym.value])], -[ yystack_.push (stack_symbol_type (s, sym.value, sym.location));])[ +[[ yystack_.push (stack_symbol_type (]b4_args( + [s], + [sym.value], + b4_locations_if([sym.location]))[));]])[ } void @@ -911,7 +692,10 @@ b4_percent_code_get[]dnl if (m) YY_SYMBOL_PRINT (m, s); ]b4_variant_if( -[[ yystack_.push (stack_symbol_type (s.state, semantic_type(), s.location)); +[[ yystack_.push (stack_symbol_type (]b4_args( + [s.state], + [semantic_type()], + b4_locations_if([s.location]))[)); ]b4_symbol_variant([[yystos_[s.state]]], [[yystack_[0].value]], [build], [s.value])], [ yystack_.push (s);])[ @@ -953,8 +737,8 @@ b4_percent_code_get[]dnl int ]b4_parser_class_name[::parse () { - /// Coded type of the lookahead. - int yychar = yyempty_; + /// Whether yyla contains a lookahead. + bool yyempty = true; /* State. */ int yyn; @@ -966,10 +750,10 @@ b4_percent_code_get[]dnl int yyerrstatus_ = 0; /// The lookahead symbol. - symbol_type yyla; + symbol_type yyla;]b4_locations_if([[ /// The locations where the error started and ended. - stack_symbol_type yyerror_range[2]; + stack_symbol_type yyerror_range[2];]])[ /// $$ and @@$. stack_symbol_type yylhs; @@ -1015,27 +799,19 @@ m4_popdef([b4_at_dollar])])dnl goto yydefault; /* Read a lookahead token. */ - if (yychar == yyempty_) + if (yyempty) { - YYCDEBUG << "Reading a token: "; - yychar = ]b4_c_function_call([yylex], [int], + YYCDEBUG << "Reading a token: "; +]b4_lex_symbol_if( +[ yyla = b4_c_function_call([yylex], [symbol_type], + m4_ifdef([b4_lex_param], b4_lex_param));], +[ yyla.type = yytranslate_ (b4_c_function_call([yylex], [int], [[YYSTYPE*], [&yyla.value]][]dnl b4_locations_if([, [[location*], [&yyla.location]]])dnl -m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; - } - - - /* Convert token to internal form. */ - if (yychar <= yyeof_) - { - yychar = yyla.type = yyeof_; - YYCDEBUG << "Now at end of input." << std::endl; - } - else - { - yyla.type = yytranslate_ (yychar); - YY_SYMBOL_PRINT ("Next token is", yyla); +m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ + yyempty = false; } + YY_SYMBOL_PRINT ("Next token is", yyla); /* If the proper action on seeing token YYLA.TYPE is to reduce or to detect an error, take that action. */ @@ -1054,7 +830,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; } /* Discard the token being shifted. */ - yychar = yyempty_; + yyempty = true; /* Count tokens shifted since error; after three, turn off error status. */ @@ -1081,9 +857,9 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; yyreduce: yylen = yyr2_[yyn];]b4_variant_if([ /* Variants are always initialized to an empty instance of the - correct type. The default $$=$1 rule is NOT applied when using - variants */ - ]b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])[],[ + correct type. The default $$=$1 action is NOT applied when using + variants. */ + ]b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build]),[ /* If YYLEN is nonzero, implement the default value of the action: `$$ = $1'. Otherwise, use the top of the stack. @@ -1094,12 +870,13 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; yylhs.value = yystack_@{yylen - 1@}.value; else yylhs.value = yystack_@{0@}.value;])[ - +]b4_locations_if([dnl +[ // Compute the default @@$. { slice slice (yystack_, yylen); YYLLOC_DEFAULT (yylhs.location, slice, yylen); - } + }]])[ // Perform the reduction. YY_REDUCE_PRINT (yyn); @@ -1120,16 +897,18 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; yylhs.state = yystate; YY_SYMBOL_PRINT ("-> $$ =", yylhs); ]b4_variant_if([[ - // Destroy the lhs symbols. + // Destroy the rhs symbols. for (int i = 0; i < yylen; ++i) - // Destroy a variant which value may have be swapped with - // yylhs.value. The value of yylhs.value (hence maybe one of - // these lhs symbols) depends on what does the default - // contruction for this type. In the case of pointers for - // instance, nothing is done, so the value is junk. Therefore - // do not try to report the content in the debug trace, it's - // junk. Hence yymsg = 0. Besides, that keeps exactly the same - // traces as with the other Bison skeletons. + // Destroy a variant which value may have been swapped with + // yylhs.value (for instance if the action was "std::swap($$, + // $1)"). The value of yylhs.value (hence possibly one of these + // rhs symbols) depends on the default contruction for this + // type. In the case of pointers for instance, no + // initialization is done, so the value is junk. Therefore do + // not try to report the value of symbols about to be destroyed + // in the debug trace, it's possibly junk. Hence yymsg = 0. + // Besides, that keeps exactly the same traces as with the other + // Bison skeletons. yy_destroy_ (0, yystack_[i]);]])[ yypop_ (yylen); @@ -1140,33 +919,32 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; yypush_ (0, yylhs); goto yynewstate; - /*------------------------------------. - | yyerrlab -- here on detecting error | - `------------------------------------*/ + /*--------------------------------------. + | yyerrlab -- here on detecting error. | + `--------------------------------------*/ yyerrlab: /* If not already recovering from an error, report this error. */ if (!yyerrstatus_) { ++yynerrs_; - error (yyla.location, yysyntax_error_ (yystate, yyla.type)); + error (]b4_args(b4_locations_if([yyla.location]), + [yysyntax_error_ (yystate, yyla.type)])[); } - yyerror_range[0].location = yyla.location; +]b4_locations_if([[ + yyerror_range[0].location = yyla.location;]])[ if (yyerrstatus_ == 3) { /* If just tried and failed to reuse lookahead token after an - error, discard it. */ - - if (yychar <= yyeof_) - { - /* Return failure if at end of input. */ - if (yychar == yyeof_) - YYABORT; - } - else - { - yy_destroy_ ("Error: discarding", yyla); - yychar = yyempty_; + error, discard it. */ + + /* Return failure if at end of input. */ + if (yyla.type == yyeof_) + YYABORT; + else + { + yy_destroy_ ("Error: discarding", yyla); + yyempty = true; } } @@ -1186,7 +964,8 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; if (false) goto yyerrorlab; - yyerror_range[0].location = yystack_[yylen - 1].location; +]b4_locations_if([[ + yyerror_range[0].location = yystack_[yylen - 1].location;]])[ /* Do not reclaim the symbols of the rule which action triggered this YYERROR. */ yypop_ (yylen); @@ -1218,16 +997,16 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; // Pop the current state because it cannot handle the error token. if (yystack_.size () == 1) YYABORT; - - yyerror_range[0].location = yystack_[0].location; +]b4_locations_if([[ + yyerror_range[0].location = yystack_[0].location;]])[ yy_destroy_ ("Error: popping", yystack_[0]); yypop_ (); yystate = yystack_[0].state; YY_STACK_PRINT (); } - +]b4_locations_if([[ yyerror_range[1].location = yyla.location; - YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2); + YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);]])[ /* Shift the error token. */ error_token.state = yystate = yyn; @@ -1246,7 +1025,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; goto yyreturn; yyreturn: - if (yychar != yyempty_) + if (!yyempty) yy_destroy_ ("Cleanup: discarding lookahead", yyla); /* Do not reclaim the symbols of the rule which action triggered @@ -1263,12 +1042,11 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[; // Generate an error message. std::string - ]b4_parser_class_name[::yysyntax_error_ (int yystate, int]dnl -b4_error_verbose_if([ tok])[) + ]b4_parser_class_name[::yysyntax_error_ (]dnl +b4_error_verbose_if([int yystate, int yytoken], + [int, int])[) { - std::string res; - YYUSE (yystate); -#if YYERROR_VERBOSE + std::string yyres;]b4_error_verbose_if([[ int yyn = yypact_[yystate]; if (yypact_ninf_ < yyn && yyn <= yylast_) { @@ -1279,79 +1057,64 @@ b4_error_verbose_if([ tok])[) /* Stay within bounds of both yycheck and yytname. */ int yychecklim = yylast_ - yyn + 1; int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_; - int count = 0; - for (int x = yyxbegin; x < yyxend; ++x) - if (yycheck_[x + yyn] == x && x != yyterror_) - ++count; - - // FIXME: This method of building the message is not compatible - // with internationalization. It should work like yacc.c does it. - // That is, first build a string that looks like this: - // "syntax error, unexpected %s or %s or %s" - // Then, invoke YY_ on this string. - // Finally, use the string as a format to output - // yytname_[tok], etc. - // Until this gets fixed, this message appears in English only. - res = "syntax error, unexpected "; - res += yytnamerr_ (yytname_[tok]); - if (count < 5) - { - count = 0; - for (int x = yyxbegin; x < yyxend; ++x) - if (yycheck_[x + yyn] == x && x != yyterror_) - { - res += (!count++) ? ", expecting " : " or "; - res += yytnamerr_ (yytname_[x]); - } - } + + // Number of reported tokens (one for the "unexpected", one per + // "expected"). + size_t yycount = 0; + // Its maximum. + enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 }; + // Arguments of yyformat. + char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM]; + yyarg[yycount++] = yytname_[yytoken]; + for (int yyx = yyxbegin; yyx < yyxend; ++yyx) + if (yycheck_[yyx + yyn] == yyx && yyx != yyterror_) + { + if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM) + { + yycount = 1; + break; + } + else + yyarg[yycount++] = yytname_[yyx]; + } + + char const* yyformat = 0; + switch (yycount) + { +#define YYCASE_(N, S) \ + case N: \ + yyformat = S; \ + break + YYCASE_(1, YY_("syntax error, unexpected %s")); + YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s")); + YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s")); + YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s")); + YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s")); +#undef YYCASE_ + } + // Argument number. + size_t yyi = 0; + for (char const* yyp = yyformat; *yyp; ++yyp) + if (yyp[0] == '%' && yyp[1] == 's' && yyi < yycount) + { + yyres += yytnamerr_ (yyarg[yyi++]); + ++yyp; + } + else + yyres += *yyp; } else -#endif - res = YY_("syntax error"); - return res; + ]])dnl +[ yyres = YY_("syntax error"); + return yyres; } - /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing - STATE-NUM. */ const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[; - ]b4_table_define([pact], [b4_pact])[; - - /* YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE - doesn't specify something else to do. Zero means the default is an - error. */ - ]b4_table_define([defact], [b4_defact])[; - - /* YYPGOTO[NTERM-NUM]. */ - ]b4_table_define([pgoto], [b4_pgoto])[; - /* YYDEFGOTO[NTERM-NUM]. */ - ]b4_table_define([defgoto], [b4_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(b4_table_ninf, b4_table_ninf) b4_parser_class_name::yytable_ninf_ = b4_table_ninf[; - ]b4_table_define([table], [b4_table])[; - - /* YYCHECK. */ - ]b4_table_define([check], [b4_check])[; - /* STOS_[STATE-NUM] -- The (internal number of the) accessing - symbol of state STATE-NUM. */ - ]b4_table_define([stos], [b4_stos])[; - -#if YYDEBUG - /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding - to YYLEX-NUM. */ - ]b4_table_define([token_number], [b4_toknum])[; -#endif - - /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives. */ - ]b4_table_define([r1], [b4_r1])[; - - /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN. */ - ]b4_table_define([r2], [b4_r2])[; +]b4_parser_tables_define[ #if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM. @@ -1364,8 +1127,7 @@ b4_error_verbose_if([ tok])[) #endif #if YYDEBUG - /* YYRLINE[YYN] -- Source line where rule number YYN was defined. */ - ]b4_table_define([rline], [b4_rline])[; +]b4_integral_parser_table_define([rline], [b4_rline])[ // Print the state stack on the debug stream. void @@ -1396,125 +1158,8 @@ b4_error_verbose_if([ tok])[) } #endif // YYDEBUG - /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX. */ - ]b4_parser_class_name[::token_number_type - ]b4_parser_class_name[::yytranslate_ (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 (t) <= user_token_number_max_) - return translate_table[t]; - else - return undef_token_; - } - +]b4_lex_symbol_if([], [b4_yytranslate_definition])[ ]b4_namespace_close[ - ]b4_epilogue[]dnl -@output(b4_dir_prefix[]stack.hh@)@ -b4_copyright([Stack handling for Bison parsers in C++])[ - -#ifndef BISON_STACK_HH -# define BISON_STACK_HH - -#include - -]b4_namespace_open[ - template > - class stack - { - public: - - // Hide our reversed order. - typedef typename S::reverse_iterator iterator; - typedef typename S::const_reverse_iterator const_iterator; - - stack () : seq_ () - { - } - - stack (unsigned int n) : seq_ (n) - { - } - - inline - T& - operator [] (unsigned int i) - { - return seq_[i]; - } - - inline - const T& - operator [] (unsigned int i) const - { - return seq_[i]; - } - - inline - void - push (const T& t) - { - seq_.push_front (t); - } - - inline - void - pop (unsigned int n = 1) - { - for (; n; --n) - seq_.pop_front (); - } - - inline - typename S::size_type - size () const - { - return seq_.size (); - } - - inline const_iterator begin () const { return seq_.rbegin (); } - inline const_iterator end () const { return seq_.rend (); } - - private: - /// The wrapped container. - S seq_; - }; - - /// Present a slice of the top of a stack. - template > - class slice - { - public: - - slice (const S& stack, - unsigned int range) : stack_ (stack), - range_ (range) - { - } - - inline - const T& - operator [] (unsigned int i) const - { - return stack_[range_ - i]; - } - - private: - - const S& stack_; - unsigned int range_; - }; -]b4_namespace_close[ - -#endif // not BISON_STACK_HH[]dnl -] m4_divert_pop(0) m4_popdef([b4_copyright_years])dnl