# C++ skeleton for Bison
-# Copyright (C) 2002-2012 Free Software Foundation, Inc.
+# 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
m4_include(b4_pkgdatadir/[c++.m4])
+# api.value.type=variant is valid.
+m4_define([b4_value_type_setup_variant])
# b4_integral_parser_table_declare(TABLE-NAME, CONTENT, COMMENT)
# --------------------------------------------------------------
-# Declare "parser::yy<TABLE-NAME>_" which contents is CONTENT.
+# Declare "parser::yy<TABLE-NAME>_" whose contents is CONTENT.
m4_define([b4_integral_parser_table_declare],
-[m4_ifval([$3], [b4_c_comment([$3], [ ])
+[m4_ifval([$3], [b4_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<TABLE-NAME>_" which contents is CONTENT.
+# Define "parser::yy<TABLE-NAME>_" whose contents is CONTENT.
m4_define([b4_integral_parser_table_define],
[ const b4_int_type_for([$2])
b4_parser_class_name::yy$1_[[]] =
};dnl
])
-
# b4_symbol_value_template(VAL, [TYPE])
# -------------------------------------
# Same as b4_symbol_value, but used in a template method. It makes
-# a difference when using variants.
+# a difference when using variants. Note that b4_value_type_setup_union
+# overrides b4_symbol_value, so we must override it again.
m4_copy([b4_symbol_value], [b4_symbol_value_template])
-
+m4_append([b4_value_type_setup_union],
+ [m4_copy_force([b4_symbol_value_union], [b4_symbol_value_template])])
# b4_lhs_value([TYPE])
# --------------------
# Same as in C, but using references instead of pointers.
m4_define([b4_symbol_action],
[b4_symbol_if([$1], [has_$2],
-[m4_pushdef([b4_dollar_dollar],
- [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
+[m4_pushdef([b4_symbol_value], m4_defn([b4_symbol_value_template]))[]dnl
+b4_dollar_pushdef([yysym.value],
+ b4_symbol_if([$1], [has_type],
+ [m4_dquote(b4_symbol([$1], [type]))]),
+ [yysym.location])dnl
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
+m4_popdef([b4_symbol_value])[]dnl
+b4_dollar_popdef[]dnl
])])
+# b4_lex
+# ------
+# Call yylex.
+m4_define([b4_lex],
+[b4_token_ctor_if(
+[b4_function_call([yylex],
+ [symbol_type], m4_ifdef([b4_lex_param], b4_lex_param))],
+[b4_function_call([yylex], [int],
+ [b4_api_PREFIX[STYPE*], [&yyla.value]][]dnl
+b4_locations_if([, [[location*], [&yyla.location]]])dnl
+m4_ifdef([b4_lex_param], [, ]b4_lex_param))])])
+
+
m4_pushdef([b4_copyright_years],
- [2002-2012])
+ [2002-2015])
m4_define([b4_parser_class_name],
[b4_percent_define_get([[parser_class_name]])])
-# The header is mandatory.
-b4_defines_if([],
- [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
-
-b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
- [# Backward compatibility.
+b4_bison_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
-@output(b4_spec_defines_file@)@
-b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++])
-[
-/**
- ** \file ]b4_spec_defines_file[
- ** Define the ]b4_namespace_ref[::parser class.
- */
-
-/* C++ LALR(1) parser skeleton written by Akim Demaille. */
-
-]b4_cpp_guard_open([b4_spec_defines_file])[
-]b4_percent_code_get([[requires]])[
+# b4_shared_declarations
+# ----------------------
+# Declaration that might either go into the header (if --defines)
+# or open coded in the parser body.
+m4_define([b4_shared_declarations],
+[b4_percent_code_get([[requires]])[
]b4_parse_assert_if([# include <cassert>])[
+# include <cstdlib> // std::abort
+# include <iostream>
# include <stdexcept>
# include <string>
-# include <iostream>
+# include <vector>]b4_defines_if([[
# include "stack.hh"
-]b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
- [[# include "location.hh"]])])[
-
-]b4_variant_if([b4_namespace_open
-b4_variant_define
-b4_namespace_close])[
+]b4_bison_locations_if([[# include "location.hh"]])])[
+]b4_variant_if([b4_variant_includes])[
+]b4_attribute_define[
]b4_YYDEBUG_define[
]b4_namespace_open[
+]b4_defines_if([],
+[b4_stack_define
+b4_bison_locations_if([b4_position_define
+b4_location_define])])[
+
+]b4_variant_if([b4_variant_define])[
+
/// A Bison parser.
class ]b4_parser_class_name[
{
#if ]b4_api_PREFIX[DEBUG
/// The current debugging stream.
- std::ostream& debug_stream () const;
+ std::ostream& debug_stream () const YY_ATTRIBUTE_PURE;
/// Set the current debugging stream.
void set_debug_stream (std::ostream &);
/// Type for debugging levels.
typedef int debug_level_type;
/// The current debugging level.
- debug_level_type debug_level () const;
+ debug_level_type debug_level () const YY_ATTRIBUTE_PURE;
/// Set the current debugging level.
void set_debug_level (debug_level_type l);
#endif
- /// Report a syntax error.]b4_locations_if([
- /// \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 (]b4_locations_if([const location_type& loc, ])[const std::string& msg);
+ virtual void error (]b4_locations_if([[const location_type& loc, ]])[const std::string& msg);
/// Report a syntax error.
void error (const syntax_error& err);
private:
+ /// This class is not copyable.
+ ]b4_parser_class_name[ (const ]b4_parser_class_name[&);
+ ]b4_parser_class_name[& operator= (const ]b4_parser_class_name[&);
+
/// State numbers.
typedef int state_type;
/// Generate an error message.
/// \param yystate the state where the error occurred.
- /// \param yytoken the lookahead token.
- virtual std::string yysyntax_error_ (state_type yystate, int yytoken);
+ /// \param yyla the lookahead token.
+ virtual std::string yysyntax_error_ (state_type yystate,
+ const symbol_type& yyla) const;
/// Compute post-reduction state.
/// \param yystate the current state
- /// \param yylhs the nonterminal to push on the stack
- state_type yy_lr_goto_state_ (state_type yystate, int yylhs);
+ /// \param yysym the nonterminal to push on the stack
+ state_type yy_lr_goto_state_ (state_type yystate, int yysym);
/// Whether the given \c yypact_ value indicates a defaulted state.
/// \param yyvalue the value to check
/// \param yyvalue the value to check
static bool yy_table_value_is_error_ (int yyvalue);
- /// Internal symbol numbers.
- typedef ]b4_int_type_for([b4_translate])[ token_number_type;
static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_;
static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ yytable_ninf_;
+ /// Convert a scanner token number \a t to a symbol number.
+ static token_number_type yytranslate_ (]b4_token_ctor_if([token_type], [int])[ t);
+
// Tables.
]b4_parser_tables_declare[]b4_error_verbose_if([
static const char* const yytname_[];
]b4_token_table_if([[#if ]b4_api_PREFIX[DEBUG]])[
]b4_integral_parser_table_declare([rline], [b4_rline],
- [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[
+ [[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.
// Debugging.
int yydebug_;
std::ostream* yycdebug_;
-#endif // ]b4_api_PREFIX[DEBUG
- /// Convert a scanner token number \a t to a symbol number.
- static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t);
-
-#if ]b4_api_PREFIX[DEBUG
/// \brief Display a symbol type, value and location.
/// \param yyo The output stream.
/// \param yysym The symbol.
- template <typename Exact>
- void yy_print_ (std::ostream& yyo,
- const symbol_base_type<Exact>& yysym) const;
+ template <typename Base>
+ void yy_print_ (std::ostream& yyo, const basic_symbol<Base>& yysym) const;
#endif
/// \brief Reclaim the memory associated to a symbol.
/// \param yymsg Why this token is reclaimed.
/// If null, print nothing.
- /// \param s The symbol.
- template <typename Exact>
- inline void yy_destroy_ (const char* yymsg,
- symbol_base_type<Exact>& yysym) const;
+ /// \param yysym The symbol.
+ template <typename Base>
+ void yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const;
private:
- /// Element of the stack: a state and its attributes.
- struct stack_symbol_type : symbol_base_type<stack_symbol_type>
+ /// Type access provider for state based symbols.
+ struct by_state
{
- /// The parent class.
- typedef symbol_base_type<stack_symbol_type> super_type;
-
/// Default constructor.
- inline stack_symbol_type ();
+ by_state ();
+
+ /// The symbol type as needed by the constructor.
+ typedef state_type kind_type;
/// Constructor.
- inline stack_symbol_type (]b4_args([state_type s],
- [const semantic_type& v],
- b4_locations_if([const location_type& l]))[);
+ by_state (kind_type s);
+
+ /// Copy constructor.
+ by_state (const by_state& other);
+
+ /// Record that this symbol is empty.
+ void clear ();
+
+ /// Steal the symbol type from \a that.
+ void move (by_state& that);
+
+ /// The (internal) type number (corresponding to \a state).
+ /// \a empty_symbol when empty.
+ symbol_number_type type_get () const;
+
+ /// The state number used to denote an empty symbol.
+ enum { empty_state = -1 };
/// The state.
+ /// \a empty when empty.
state_type state;
+ };
- /// The type (corresponding to \a state).
- inline int type_get_ () const;
+ /// "Internal" symbol: element of the stack.
+ struct stack_symbol_type : basic_symbol<by_state>
+ {
+ /// Superclass.
+ typedef basic_symbol<by_state> super_type;
+ /// Construct an empty symbol.
+ stack_symbol_type ();
+ /// Steal the contents from \a sym to build this.
+ stack_symbol_type (state_type s, symbol_type& sym);
+ /// Assignment, needed by push_back.
+ stack_symbol_type& operator= (const stack_symbol_type& that);
};
/// Stack type.
/// if null, no trace is output.
/// \param s the symbol
/// \warning the contents of \a s.value is stolen.
- inline void yypush_ (const char* m, stack_symbol_type& s);
+ void yypush_ (const char* m, stack_symbol_type& s);
/// Push a new look ahead token on the state on the stack.
/// \param m a debug message to display
/// \param s the state
/// \param sym the symbol (for its value and location).
/// \warning the contents of \a s.value is stolen.
- inline void yypush_ (const char* m, state_type s, symbol_type& sym);
+ void yypush_ (const char* m, state_type s, symbol_type& sym);
/// Pop \a n symbols the three stacks.
- inline void yypop_ (unsigned int n = 1);
+ void yypop_ (unsigned n = 1);
- /* Constants. */
+ /// Constants.
enum
{
yyeof_ = 0,
- yylast_ = ]b4_last[, //< Last index in yytable_.
- yynnts_ = ]b4_nterms_number[, //< Number of nonterminal symbols.
- yyempty_ = -2,
- yyfinal_ = ]b4_final_state_number[, //< Termination state number.
+ yylast_ = ]b4_last[, ///< Last index in yytable_.
+ yynnts_ = ]b4_nterms_number[, ///< Number of nonterminal symbols.
+ yyfinal_ = ]b4_final_state_number[, ///< Termination state number.
yyterror_ = 1,
yyerrcode_ = 256,
- yyntokens_ = ]b4_tokens_number[ //< Number of tokens.
+ yyntokens_ = ]b4_tokens_number[ ///< Number of tokens.
};
]b4_parse_param_vars[
};
-]b4_lex_symbol_if([b4_yytranslate_define
+]b4_token_ctor_if([b4_yytranslate_define
b4_public_types_define])[
]b4_namespace_close[
]b4_percent_define_flag_if([[global_tokens_and_yystype]],
-[b4_token_defines(b4_tokens)
+[b4_token_defines
#ifndef ]b4_api_PREFIX[STYPE
- /* Redirection for backward compatibility. */
+ // Redirection for backward compatibility.
# define ]b4_api_PREFIX[STYPE b4_namespace_ref::b4_parser_class_name::semantic_type
#endif
])[
]b4_percent_code_get([[provides]])[
+]])
+
+b4_defines_if(
+[b4_output_begin([b4_spec_defines_file])
+b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++])
+[
+/**
+ ** \file ]b4_spec_defines_file[
+ ** Define the ]b4_namespace_ref[::parser class.
+ */
+
+// C++ LALR(1) parser skeleton written by Akim Demaille.
+
+]b4_cpp_guard_open([b4_spec_defines_file])[
+]b4_shared_declarations[
]b4_cpp_guard_close([b4_spec_defines_file])
-@output(b4_parser_file_name@)@
+b4_output_end()
+])
+
+
+b4_output_begin([b4_parser_file_name])
b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++])
b4_percent_code_get([[top]])[]dnl
m4_if(b4_prefix, [yy], [],
// Take the name prefix into account.
#define yylex b4_prefix[]lex])[
-/* First part of user declarations. */
+// First part of user declarations.
]b4_user_pre_prologue[
-#include "@basename(]b4_spec_defines_file[@)"
+]b4_null_define[
+
+]b4_defines_if([[#include "@basename(]b4_spec_defines_file[@)"]],
+ [b4_shared_declarations])[
-/* User implementation prologue. */
+// User implementation prologue.
]b4_user_post_prologue[
]b4_percent_code_get[
-]b4_null_define[
-
#ifndef YY_
# if defined YYENABLE_NLS && YYENABLE_NLS
# if ENABLE_NLS
-# include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
+# include <libintl.h> // FIXME: INFRINGES ON USER NAME SPACE.
# define YY_(msgid) dgettext ("bison-runtime", msgid)
# endif
# endif
[#define YYRHSLOC(Rhs, K) ((Rhs)[K].location)
]b4_yylloc_default_define])[
-/* Suppress unused-variable warnings by "using" E. */
-#define YYUSE(e) ((void) (e))
+// Suppress unused-variable warnings by "using" E.
+#define YYUSE(E) ((void) (E))
-/* Enable debugging if requested. */
+// Enable debugging if requested.
#if ]b4_api_PREFIX[DEBUG
-/* A pseudo ostream that takes yydebug_ into account. */
+// A pseudo ostream that takes yydebug_ into account.
# define YYCDEBUG if (yydebug_) (*yycdebug_)
# define YY_SYMBOL_PRINT(Title, Symbol) \
yystack_print_ (); \
} while (false)
-#else /* !]b4_api_PREFIX[DEBUG */
+#else // !]b4_api_PREFIX[DEBUG
# define YYCDEBUG if (false) std::cerr
# define YY_SYMBOL_PRINT(Title, Symbol) YYUSE(Symbol)
# define YY_REDUCE_PRINT(Rule) static_cast<void>(0)
# define YY_STACK_PRINT() static_cast<void>(0)
-#endif /* !]b4_api_PREFIX[DEBUG */
+#endif // !]b4_api_PREFIX[DEBUG
#define yyerrok (yyerrstatus_ = 0)
-#define yyclearin (yyempty = true)
+#define yyclearin (yyla.clear ())
#define YYACCEPT goto yyacceptlab
#define YYABORT goto yyabortlab
case '\\':
if (*++yyp != '\\')
goto do_not_strip_quotes;
- /* Fall through. */
+ // Fall through.
default:
yyr += *yyp;
break;
]m4_ifset([b4_parse_param], [ ], [ :])[yydebug_ (false),
yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
#endif]b4_parse_param_cons[
- {
- }
+ {}
]b4_parser_class_name::~b4_parser_class_name[ ()
- {
- }
+ {}
/*---------------.
| Symbol types. |
`---------------*/
-]b4_lex_symbol_if([], [b4_public_types_define])[
+]b4_token_ctor_if([], [b4_public_types_define])[
- // stack_symbol_type.
- ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
- : super_type ()
- , state ()
+ // by_state.
+ inline
+ ]b4_parser_class_name[::by_state::by_state ()
+ : state (empty_state)
+ {}
+
+ inline
+ ]b4_parser_class_name[::by_state::by_state (const by_state& other)
+ : state (other.state)
+ {}
+
+ inline
+ void
+ ]b4_parser_class_name[::by_state::clear ()
{
+ state = empty_state;
}
- ]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)
+ inline
+ void
+ ]b4_parser_class_name[::by_state::move (by_state& that)
{
+ state = that.state;
+ that.clear ();
}
- int
- ]b4_parser_class_name[::stack_symbol_type::type_get_ () const
+ inline
+ ]b4_parser_class_name[::by_state::by_state (state_type s)
+ : state (s)
+ {}
+
+ inline
+ ]b4_parser_class_name[::symbol_number_type
+ ]b4_parser_class_name[::by_state::type_get () const
+ {
+ if (state == empty_state)
+ return empty_symbol;
+ else
+ return yystos_[state];
+ }
+
+ inline
+ ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
+ {}
+
+
+ inline
+ ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (state_type s, symbol_type& that)
+ : super_type (s]b4_locations_if([, that.location])[)
{
- return yystos_[state];
+ ]b4_variant_if([b4_symbol_variant([that.type_get ()],
+ [value], [move], [that.value])],
+ [[value = that.value;]])[
+ // that is emptied.
+ that.type = empty_symbol;
}
+ inline
+ ]b4_parser_class_name[::stack_symbol_type&
+ ]b4_parser_class_name[::stack_symbol_type::operator= (const stack_symbol_type& that)
+ {
+ state = that.state;
+ ]b4_variant_if([b4_symbol_variant([that.type_get ()],
+ [value], [copy], [that.value])],
+ [[value = that.value;]])[]b4_locations_if([
+ location = that.location;])[
+ return *this;
+ }
- template <typename Exact>
+
+ template <typename Base>
+ inline
void
- ]b4_parser_class_name[::yy_destroy_ (const char* yymsg,
- symbol_base_type<Exact>& yysym) const
+ ]b4_parser_class_name[::yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const
{
if (yymsg)
- YY_SYMBOL_PRINT (yymsg, yysym);
+ YY_SYMBOL_PRINT (yymsg, yysym);]b4_variant_if([], [
// User destructor.
- int yytype = yysym.type_get ();
- switch (yytype)
- {
-]b4_symbol_foreach([b4_symbol_destructor])dnl
-[ default:
- break;
- }]b4_variant_if([
-
- // Type destructor.
- b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[
+ b4_symbol_actions([destructor], [yysym.type_get ()])])[
}
#if ]b4_api_PREFIX[DEBUG
- template <typename Exact>
+ template <typename Base>
void
]b4_parser_class_name[::yy_print_ (std::ostream& yyo,
- const symbol_base_type<Exact>& yysym) const
+ const basic_symbol<Base>& yysym) const
{
std::ostream& yyoutput = yyo;
YYUSE (yyoutput);
- int yytype = yysym.type_get ();
+ symbol_number_type yytype = yysym.type_get ();
+ // Avoid a (spurious) G++ 4.8 warning about "array subscript is
+ // below array bounds".
+ if (yysym.empty ())
+ std::abort ();
yyo << (yytype < yyntokens_ ? "token" : "nterm")
<< ' ' << yytname_[yytype] << " ("]b4_locations_if([
<< yysym.location << ": "])[;
- switch (yytype)
- {
-]b4_symbol_foreach([b4_symbol_printer])dnl
-[ default:
- break;
- }
+ ]b4_symbol_actions([printer])[
yyo << ')';
}
#endif
+ inline
void
- ]b4_parser_class_name[::yypush_ (const char* m, state_type s,
- symbol_type& sym)
+ ]b4_parser_class_name[::yypush_ (const char* m, state_type s, symbol_type& sym)
{
- if (m)
- YY_SYMBOL_PRINT (m, sym);
-]b4_variant_if(
-[[ 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 (]b4_args(
- [s],
- [sym.value],
- b4_locations_if([sym.location]))[));]])[
+ stack_symbol_type t (s, sym);
+ yypush_ (m, t);
}
+ inline
void
]b4_parser_class_name[::yypush_ (const char* m, stack_symbol_type& s)
{
if (m)
YY_SYMBOL_PRINT (m, s);
-]b4_variant_if(
-[[ 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);])[
+ yystack_.push (s);
}
+ inline
void
- ]b4_parser_class_name[::yypop_ (unsigned int n)
+ ]b4_parser_class_name[::yypop_ (unsigned n)
{
yystack_.pop (n);
}
#endif // ]b4_api_PREFIX[DEBUG
inline ]b4_parser_class_name[::state_type
- ]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yylhs)
+ ]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yysym)
{
- int yyr = yypgoto_[yylhs - yyntokens_] + yystate;
+ int yyr = yypgoto_[yysym - yyntokens_] + yystate;
if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
return yytable_[yyr];
else
- return yydefgoto_[yylhs - yyntokens_];
+ return yydefgoto_[yysym - yyntokens_];
}
inline bool
int
]b4_parser_class_name[::parse ()
{
- /// Whether yyla contains a lookahead.
- bool yyempty = true;
-
- /* State. */
+ // State.
int yyn;
+ /// Length of the RHS of the rule being reduced.
int yylen = 0;
- /* Error handling. */
+ // Error handling.
int yynerrs_ = 0;
int yyerrstatus_ = 0;
/// The locations where the error started and ended.
stack_symbol_type yyerror_range[3];]])[
- /// $$ and @@$.
- stack_symbol_type yylhs;
-
/// The return value of parse ().
int yyresult;
+ // FIXME: This shoud be completely indented. It is not yet to
+ // avoid gratuitous conflicts when merging into the master branch.
+ try
+ {
YYCDEBUG << "Starting parse" << std::endl;
]m4_ifdef([b4_initial_action], [
-m4_pushdef([b4_at_dollar], [yyla.location])dnl
-m4_pushdef([b4_dollar_dollar], [yyla.value])dnl
- /* User initialization code. */
+b4_dollar_pushdef([yyla.value], [], [yyla.location])dnl
+ // User initialization code.
b4_user_initial_action
-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])])dnl
+b4_dollar_popdef])[]dnl
[ /* Initialize the stack. The initial state will be set in
yynewstate, since the latter expects the semantical and the
location values to have been already stored, initialize these
stacks with a primary value. */
- yystack_ = stack_type (0);
- yypush_ (YY_NULL, 0, yyla);
+ yystack_.clear ();
+ yypush_ (YY_NULLPTR, 0, yyla);
// A new symbol was pushed on the stack.
yynewstate:
YYCDEBUG << "Entering state " << yystack_[0].state << std::endl;
- /* Accept? */
+ // Accept?
if (yystack_[0].state == yyfinal_)
goto yyacceptlab;
goto yybackup;
- /* Backup. */
+ // Backup.
yybackup:
- /* Try to take a decision without lookahead. */
+ // Try to take a decision without lookahead.
yyn = yypact_[yystack_[0].state];
if (yy_pact_value_is_default_ (yyn))
goto yydefault;
- /* Read a lookahead token. */
- if (yyempty)
+ // Read a lookahead token.
+ if (yyla.empty ())
{
YYCDEBUG << "Reading a token: ";
try
- {
-]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],
- [b4_api_PREFIX[STYPE*], [&yyla.value]][]dnl
-b4_locations_if([, [[location*], [&yyla.location]]])dnl
-m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
- }
+ {]b4_token_ctor_if([[
+ symbol_type yylookahead (]b4_lex[);
+ yyla.move (yylookahead);]], [[
+ yyla.type = yytranslate_ (]b4_lex[);]])[
+ }
catch (const syntax_error& yyexc)
- {
- error (yyexc);
- goto yyerrlab1;
- }
- yyempty = false;
+ {
+ error (yyexc);
+ goto yyerrlab1;
+ }
}
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. */
- yyn += yyla.type;
- if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type)
+ yyn += yyla.type_get ();
+ if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type_get ())
goto yydefault;
- /* Reduce or error. */
+ // Reduce or error.
yyn = yytable_[yyn];
if (yyn <= 0)
{
goto yyreduce;
}
- /* Discard the token being shifted. */
- yyempty = true;
-
- /* Count tokens shifted since error; after three, turn off error
- status. */
+ // Count tokens shifted since error; after three, turn off error status.
if (yyerrstatus_)
--yyerrstatus_;
- /* Shift the lookahead token. */
+ // Shift the lookahead token.
yypush_ ("Shifting", yyn, yyla);
goto yynewstate;
`-----------------------------*/
yyreduce:
yylen = yyr2_[yyn];
- yylhs.state = yy_lr_goto_state_(yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([
- /* Variants are always initialized to an empty instance of the
- 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:
- `$$ = $1'. Otherwise, use the top of the stack.
-
- Otherwise, the following line sets YYLHS.VALUE to garbage.
- This behavior is undocumented and Bison
- users should not rely upon it. */
- if (yylen)
- yylhs.value = yystack_@{yylen - 1@}.value;
- else
- yylhs.value = yystack_@{0@}.value;])[
+ {
+ stack_symbol_type yylhs;
+ yylhs.state = yy_lr_goto_state_ (yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([
+ /* Variants are always initialized to an empty instance of the
+ correct type. The default '$$ = $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: '$$ = $1'. Otherwise, use the top of the stack.
+
+ Otherwise, the following line sets YYLHS.VALUE to garbage.
+ This behavior is undocumented and Bison users should not rely
+ upon it. */
+ if (yylen)
+ yylhs.value = yystack_@{yylen - 1@}.value;
+ else
+ yylhs.value = yystack_@{0@}.value;])[
]b4_locations_if([dnl
[
- // Compute the default @@$.
- {
- slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
- YYLLOC_DEFAULT (yylhs.location, slice, yylen);
- }]])[
-
- // Perform the reduction.
- YY_REDUCE_PRINT (yyn);
- try
- {
- switch (yyn)
+ // Default location.
{
+ slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
+ YYLLOC_DEFAULT (yylhs.location, slice, yylen);
+ yyerror_range[1].location = yylhs.location;
+ }]])[
+
+ // Perform the reduction.
+ YY_REDUCE_PRINT (yyn);
+ try
+ {
+ switch (yyn)
+ {
]b4_user_actions[
- default:
- break;
- }
- }
- catch (const syntax_error& yyexc)
- {
- error (yyexc);
- YYERROR;
- }
- YY_SYMBOL_PRINT ("-> $$ =", yylhs);
-]b4_variant_if([[
- // Destroy the rhs symbols.
- for (int i = 0; i < yylen; ++i)
- // Destroy a variant which value may have been swapped with
- // yylhs.value (for instance if the action was "std::swap($$,
- // $1)"). The value of yylhs.value (hence possibly one of these
- // rhs symbols) depends on the default construction for this
- // type. In the case of pointers for instance, no
- // initialization is done, so the value is junk. Therefore do
- // not try to report the value of symbols about to be destroyed
- // in the debug trace, it's possibly junk. Hence yymsg = 0.
- // Besides, that keeps exactly the same traces as with the other
- // Bison skeletons.
- yy_destroy_ (YY_NULL, yystack_[i]);]])[
-
- yypop_ (yylen);
- yylen = 0;
- YY_STACK_PRINT ();
+ default:
+ break;
+ }
+ }
+ catch (const syntax_error& yyexc)
+ {
+ error (yyexc);
+ YYERROR;
+ }
+ YY_SYMBOL_PRINT ("-> $$ =", yylhs);
+ yypop_ (yylen);
+ yylen = 0;
+ YY_STACK_PRINT ();
- /* Shift the result of the reduction. */
- yypush_ (YY_NULL, yylhs);
+ // Shift the result of the reduction.
+ yypush_ (YY_NULLPTR, yylhs);
+ }
goto yynewstate;
/*--------------------------------------.
| yyerrlab -- here on detecting error. |
`--------------------------------------*/
yyerrlab:
- /* If not already recovering from an error, report this error. */
+ // If not already recovering from an error, report this error.
if (!yyerrstatus_)
{
++yynerrs_;
- error (]b4_args(b4_locations_if([yyla.location]),
- [[yysyntax_error_ (yystack_[0].state,
- yyempty ? yyempty_ : yyla.type)]])[);
+ error (]b4_join(b4_locations_if([yyla.location]),
+ [[yysyntax_error_ (yystack_[0].state, yyla)]])[);
}
]b4_locations_if([[
/* If just tried and failed to reuse lookahead token after an
error, discard it. */
- /* Return failure if at end of input. */
- if (yyla.type == yyeof_)
+ // Return failure if at end of input.
+ if (yyla.type_get () == yyeof_)
YYABORT;
- else if (!yyempty)
+ else if (!yyla.empty ())
{
yy_destroy_ ("Error: discarding", yyla);
- yyempty = true;
+ yyla.clear ();
}
}
- /* Else will try to reuse lookahead token after shifting the error
- token. */
+ // Else will try to reuse lookahead token after shifting the error token.
goto yyerrlab1;
YYERROR and the label yyerrorlab therefore never appears in user
code. */
if (false)
- goto yyerrorlab;]b4_locations_if([[
- yyerror_range[1].location = yystack_[yylen - 1].location;]])b4_variant_if([[
- /* $$ was initialized before running the user action. */
- yy_destroy_ ("Error: discarding", yylhs);]])[
- /* Do not reclaim the symbols of the rule which action triggered
+ goto yyerrorlab;
+ /* Do not reclaim the symbols of the rule whose action triggered
this YYERROR. */
yypop_ (yylen);
yylen = 0;
| yyerrlab1 -- common code for both syntax error and YYERROR. |
`-------------------------------------------------------------*/
yyerrlab1:
- yyerrstatus_ = 3; /* Each real token shifted decrements this. */
+ yyerrstatus_ = 3; // Each real token shifted decrements this.
{
stack_symbol_type error_token;
for (;;)
yyerror_range[2].location = yyla.location;
YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);]])[
- /* Shift the error token. */
+ // Shift the error token.
error_token.state = yyn;
yypush_ ("Shifting", error_token);
}
goto yynewstate;
- /* Accept. */
+ // Accept.
yyacceptlab:
yyresult = 0;
goto yyreturn;
- /* Abort. */
+ // Abort.
yyabortlab:
yyresult = 1;
goto yyreturn;
yyreturn:
- if (!yyempty)
+ if (!yyla.empty ())
yy_destroy_ ("Cleanup: discarding lookahead", yyla);
- /* Do not reclaim the symbols of the rule which action triggered
+ /* Do not reclaim the symbols of the rule whose action triggered
this YYABORT or YYACCEPT. */
yypop_ (yylen);
- while (yystack_.size () != 1)
+ while (1 < yystack_.size ())
{
yy_destroy_ ("Cleanup: popping", yystack_[0]);
yypop_ ();
return yyresult;
}
+ catch (...)
+ {
+ YYCDEBUG << "Exception caught: cleaning lookahead and stack"
+ << std::endl;
+ // Do not try to display the values of the reclaimed symbols,
+ // as their printer might throw an exception.
+ if (!yyla.empty ())
+ yy_destroy_ (YY_NULLPTR, yyla);
+
+ while (1 < yystack_.size ())
+ {
+ yy_destroy_ (YY_NULLPTR, yystack_[0]);
+ yypop_ ();
+ }
+ throw;
+ }
+ }
void
]b4_parser_class_name[::error (const syntax_error& yyexc)
{
- error (]b4_args(b4_locations_if([yyexc.location]),
+ error (]b4_join(b4_locations_if([yyexc.location]),
[[yyexc.what()]])[);
}
// Generate an error message.
std::string
]b4_parser_class_name[::yysyntax_error_ (]dnl
-b4_error_verbose_if([state_type yystate, int yytoken],
- [int, int])[)
+b4_error_verbose_if([state_type yystate, const symbol_type& yyla],
+ [state_type, const symbol_type&])[) const
{]b4_error_verbose_if([[
- std::string yyres;
// Number of reported tokens (one for the "unexpected", one per
// "expected").
size_t yycount = 0;
the only way this function was invoked is if the default action
is an error action. In that case, don't check for expected
tokens because there are none.
- - The only way there can be no lookahead present (in yytoken) is
+ - The only way there can be no lookahead present (in yyla) is
if this state is a consistent state with a default action.
Thus, detecting the absence of a lookahead is sufficient to
determine that there is no unexpected or expected token to
token that will not be accepted due to an error action in a
later state.
*/
- if (yytoken != yyempty_)
+ if (!yyla.empty ())
{
+ int yytoken = yyla.type_get ();
yyarg[yycount++] = yytname_[yytoken];
int yyn = yypact_[yystate];
if (!yy_pact_value_is_default_ (yyn))
YYCHECK. In other words, skip the first -YYN actions for
this state because they are default actions. */
int yyxbegin = yyn < 0 ? -yyn : 0;
- /* Stay within bounds of both yycheck and yytname. */
+ // Stay within bounds of both yycheck and yytname.
int yychecklim = yylast_ - yyn + 1;
int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
for (int yyx = yyxbegin; yyx < yyxend; ++yyx)
}
}
- char const* yyformat = YY_NULL;
+ char const* yyformat = YY_NULLPTR;
switch (yycount)
{
#define YYCASE_(N, S) \
case N: \
yyformat = S; \
break
- YYCASE_(0, YY_("syntax error"));
- 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"));
+ YYCASE_ (0, YY_("syntax error"));
+ 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_
}
+ std::string yyres;
// Argument number.
size_t yyi = 0;
for (char const* yyp = yyformat; *yyp; ++yyp)
]b4_parser_tables_define[
]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[
- /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
- First, the terminals, then, starting at \a yyntokens_, nonterminals. */
+ // YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
+ // First, the terminals, then, starting at \a yyntokens_, nonterminals.
const char*
const ]b4_parser_class_name[::yytname_[] =
{
void
]b4_parser_class_name[::yy_reduce_print_ (int yyrule)
{
- unsigned int yylno = yyrline_[yyrule];
+ unsigned yylno = yyrline_[yyrule];
int yynrhs = yyr2_[yyrule];
- /* Print the symbols being reduced, and their result. */
+ // Print the symbols being reduced, and their result.
*yycdebug_ << "Reducing stack by rule " << yyrule - 1
<< " (line " << yylno << "):" << std::endl;
- /* The symbols being reduced. */
+ // The symbols being reduced.
for (int yyi = 0; yyi < yynrhs; yyi++)
YY_SYMBOL_PRINT (" $" << yyi + 1 << " =",
]b4_rhs_data(yynrhs, yyi + 1)[);
}
#endif // ]b4_api_PREFIX[DEBUG
-]b4_lex_symbol_if([], [b4_yytranslate_define])[
+]b4_token_ctor_if([], [b4_yytranslate_define])[
]b4_namespace_close[
]b4_epilogue[]dnl
-m4_divert_pop(0)
+b4_output_end()
+
+
m4_popdef([b4_copyright_years])dnl
projects / bison.git / blobdiff