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bison/data/lalr1.cc
Akim Demaille 247efe346c Formatting changes.
2008-11-10 12:01:19 +01:00

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# C++ skeleton for Bison
# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
# 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/>.
m4_include(b4_pkgdatadir/[c++.m4])
# b4_table_define(TABLE-NAME, CONTENT)
# ------------------------------------
# Define "parser::yy<TABLE-NAME>_" which contents is CONTENT.
m4_define([b4_table_define],
[const b4_int_type_for([$2])
b4_parser_class_name::yy$1_[[]] =
{
$2
}dnl
])
# b4_symbol_value_template(VAL, [TYPE])
# -------------------------------------
# Same as b4_symbol_value, but used in a template method.
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_assert_if([IF-ASSERTIONS-ARE-USED], [IF-NOT])
# ------------------------------------------------
m4_define([b4_assert_if],
[b4_percent_define_ifdef([[assert]], [$1], [$2])])
# b4_lhs_value([TYPE])
# --------------------
# Expansion of $<TYPE>$.
m4_define([b4_lhs_value],
[b4_symbol_value([yylhs.value], [$1])])
# b4_lhs_location()
# -----------------
# Expansion of @$.
m4_define([b4_lhs_location],
[yylhs.location])
# b4_rhs_data(RULE-LENGTH, NUM)
# -----------------------------
# 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)@}])
# 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],
[b4_rhs_data([$1], [$2]).state])
# 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([b4_rhs_data([$1], [$2]).value], [$3])])
# b4_rhs_location(RULE-LENGTH, NUM)
# ---------------------------------
# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
# on RHS.
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_if(NUM, FIELD, IF-TRUE, IF-FALSE)
# -------------------------------------------
# If FIELD about symbol #NUM is 1 expand IF-TRUE, if is 0, expand IF-FALSE.
# Otherwise an error.
m4_define([b4_symbol_if],
[m4_case(b4_symbol([$1], [$2]),
[1], [$3],
[0], [$4],
[m4_fatal([$0: field $2 of $1 is not a Boolean:] b4_symbol([$1], [$2]))])])
# b4_symbol_actions(FILENAME, LINENO,
# SYMBOL-TAG, SYMBOL-NUM,
# SYMBOL-ACTION, SYMBOL-TYPENAME)
# -------------------------------------------------
# Same as in C, but using references instead of pointers.
m4_define([b4_symbol_actions],
[m4_pushdef([b4_dollar_dollar],
[b4_symbol_value_template([yysym.value], [$6])])dnl
m4_pushdef([b4_at_dollar], [yysym.location])dnl
case $4: // $3
b4_syncline([$2], [$1])
$5;
b4_syncline([@oline@], [@ofile@])
break;
m4_popdef([b4_at_dollar])dnl
m4_popdef([b4_dollar_dollar])dnl
])
# 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.
# Skip NUMS that have no type-name.
m4_define([b4_type_action_],
[b4_symbol_if([$1], [has_type_name],
[m4_map([b4_symbol_case_], [$@])[]dnl
b4_dollar_dollar([b4_symbol([$1], [number])],
[b4_symbol([$1], [tag])],
[b4_symbol([$1], [type_name])]);
break;
])])
# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS])
# ------------------------------------------------
# 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
])
# _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_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
])
m4_pushdef([b4_copyright_years],
[2002, 2003, 2004, 2005, 2006, 2007, 2008])
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]])])
# Backward compatibility.
m4_define([b4_location_constructors])
m4_include(b4_pkgdatadir/[location.cc])
# We do want M4 expansion after # for CPP macros.
m4_changecom()
m4_divert_push(0)dnl
b4_defines_if(
[@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.
[
/* C++ LALR(1) parser skeleton written by Akim Demaille. */
#ifndef PARSER_HEADER_H
# define PARSER_HEADER_H
]b4_percent_code_get([[requires]])[
]b4_assert_if([#include <cassert>])[
#include <string>
#include <iostream>
#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 <size_t S>
struct variant
{]b4_assert_if([
/// Whether something is contained.
bool built;
/// Initially uninitialized.
variant ()
: built(false)
{}])[
/// Instantiate a \a T in here.
template <typename T>
inline T&
build()
{]b4_assert_if([
assert(!built);
built = true;])[
return *new (buffer) T;
}
/// Instantiate a \a T in here from \a t.
template <typename T>
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 <typename T>
inline T&
as()
{]b4_assert_if([
assert(built);])[
return reinterpret_cast<T&>(buffer);
}
/// Const accessor to a built \a T (for %printer).
template <typename T>
inline const T&
as() const
{]b4_assert_if([
assert(built);])[
return reinterpret_cast<const T&>(buffer);
}
/// Swap the content with \a other.
template <typename T>
inline void
swap(variant<S>& other)
{
std::swap(as<T>(), other.as<T>());
}
/// Assign the content of \a other to this.
/// Destroys \a other.
template <typename T>
inline void
build(variant<S>& other)
{
build<T>();
swap<T>(other);
other.destroy<T>();
}
/// Destroy the stored \a T.
template <typename T>
inline void
destroy()
{
as<T>().~T();]b4_assert_if([
built = false;])[
}
/// A buffer large enough to store any of the semantic values.
char buffer[S];
};
]])[
]b4_namespace_close[
#include "location.hh"
/* Enabling traces. */
#ifndef YYDEBUG
# define YYDEBUG ]b4_debug_flag[
#endif
/* Enabling verbose error messages. */
#ifdef YYERROR_VERBOSE
# undef YYERROR_VERBOSE
# define YYERROR_VERBOSE 1
#else
# define YYERROR_VERBOSE ]b4_error_verbose_flag[
#endif
/* Enabling the token table. */
#ifndef YYTOKEN_TABLE
# define YYTOKEN_TABLE ]b4_token_table[
#endif
/* 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 = (Rhs)[1].location.begin; \
(Current).end = (Rhs)[N].location.end; \
} \
else \
{ \
(Current).begin = (Current).end = (Rhs)[0].location.end; \
} \
} while (false)
#endif
]b4_namespace_open[
/// A Bison parser.
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<sizeof(union_type)> 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;
/// Build a parser object.
]b4_parser_class_name[ (]b4_parse_param_decl[);
virtual ~]b4_parser_class_name[ ();
/// Parse.
/// \returns 0 iff parsing succeeded.
virtual int parse ();
#if YYDEBUG
/// The current debugging stream.
std::ostream& debug_stream () const;
/// 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;
/// Set the current debugging level.
void set_debug_level (debug_level_type l);
#endif
private:
/// Report a syntax error.
/// \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);
/// Generate an error message.
/// \param state the state where the error occurred.
/// \param tok the lookahead token.
virtual std::string yysyntax_error_ (int yystate, int tok);
/// State numbers.
typedef int state_type;
/// 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_[];
#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
/// For a symbol, its name in clear.
static const char* const yytname_[];
#endif
#if YYERROR_VERBOSE
/// Convert the symbol name \a n to a form suitable for a diagnostic.
virtual std::string yytnamerr_ (const char *n);
#endif
#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_[];
/// 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.
virtual void yystack_print_ ();
/* Debugging. */
int yydebug_;
std::ostream* yycdebug_;
#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 <typename Exact>
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;
};
#if YYDEBUG
/// \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;
#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;
/// Element of the stack: a state and its attributes.
struct symbol_type : symbol_base_type<symbol_type>
{
/// The parent class.
typedef symbol_base_type<symbol_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;
};
/// Element of the stack: a state and its attributes.
struct stack_symbol_type : symbol_base_type<stack_symbol_type>
{
/// The parent class.
typedef symbol_base_type<stack_symbol_type> super_type;
/// Default constructor.
inline stack_symbol_type ();
/// Constructor.
inline stack_symbol_type (state_type s,
const semantic_type& v, const location_type& l);
/// The state.
state_type state;
/// Return the type corresponding to this state.
inline int type_get_ () const;
};
/// Stack type.
typedef stack<stack_symbol_type> stack_type;
/// The stack.
stack_type yystack_;
/// Push a new state on the stack.
/// \param m a debug message to display
/// 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);
/// Push a new look ahead token on the state on the stack.
/// \param m a debug message to display
/// if null, no trace is output.
/// \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);
/// Pop \a n symbols the three stacks.
inline void yypop_ (unsigned int n = 1);
/* 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.
yyterror_ = 1,
yyerrcode_ = 256,
yyntokens_ = ]b4_tokens_number[, //< Number of tokens.
};
]b4_parse_param_vars[
};
]b4_namespace_close[
]b4_percent_define_flag_if([[global_tokens_and_yystype]],
[b4_token_defines(b4_tokens)
#ifndef YYSTYPE
/* Redirection for backward compatibility. */
# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type
#endif
])
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
m4_if(b4_prefix, [yy], [],
[
// Take the name prefix into account.
#define yylex b4_prefix[]lex])[
/* First part of user declarations. */
]b4_user_pre_prologue
b4_defines_if([[
#include "@basename(]b4_spec_defines_file[@)"]])[
/* User implementation prologue. */
]b4_user_post_prologue
b4_percent_code_get[]dnl
[#ifndef YY_
# if YYENABLE_NLS
# if ENABLE_NLS
# include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
# define YY_(msgid) dgettext ("bison-runtime", msgid)
# endif
# endif
# ifndef YY_
# define YY_(msgid) msgid
# endif
#endif
/* Suppress unused-variable warnings by "using" E. */
#define YYUSE(e) ((void) (e))
/* Enable debugging if requested. */
#if YYDEBUG
/* A pseudo ostream that takes yydebug_ into account. */
# define YYCDEBUG if (yydebug_) (*yycdebug_)
# define YY_SYMBOL_PRINT(Title, Symbol) \
do { \
if (yydebug_) \
{ \
*yycdebug_ << Title << ' '; \
yy_print_ (*yycdebug_, Symbol); \
*yycdebug_ << std::endl; \
} \
} while (false)
# define YY_REDUCE_PRINT(Rule) \
do { \
if (yydebug_) \
yy_reduce_print_ (Rule); \
} while (false)
# define YY_STACK_PRINT() \
do { \
if (yydebug_) \
yystack_print_ (); \
} while (false)
#else /* !YYDEBUG */
# define YYCDEBUG if (false) std::cerr
# define YY_SYMBOL_PRINT(Title, Symbol) static_cast<void>(0)
# define YY_REDUCE_PRINT(Rule) static_cast<void>(0)
# define YY_STACK_PRINT() static_cast<void>(0)
#endif /* !YYDEBUG */
#define yyerrok (yyerrstatus_ = 0)
#define yyclearin (yychar = yyempty_)
#define YYACCEPT goto yyacceptlab
#define YYABORT goto yyabortlab
#define YYERROR goto yyerrorlab
#define YYRECOVERING() (!!yyerrstatus_)
]b4_namespace_open[
#if YYERROR_VERBOSE
/* Return YYSTR after stripping away unnecessary quotes and
backslashes, so that it's suitable for yyerror. The heuristic is
that double-quoting is unnecessary unless the string contains an
apostrophe, a comma, or backslash (other than backslash-backslash).
YYSTR is taken from yytname. */
std::string
]b4_parser_class_name[::yytnamerr_ (const char *yystr)
{
if (*yystr == '"')
{
std::string yyr = "";
char const *yyp = yystr;
for (;;)
switch (*++yyp)
{
case '\'':
case ',':
goto do_not_strip_quotes;
case '\\':
if (*++yyp != '\\')
goto do_not_strip_quotes;
/* Fall through. */
default:
yyr += *yyp;
break;
case '"':
return yyr;
}
do_not_strip_quotes: ;
}
return yystr;
}
#endif
/// Build a parser object.
]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
:])[
#if YYDEBUG
]m4_ifset([b4_parse_param], [ ], [ :])[yydebug_ (false),
yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
#endif]b4_parse_param_cons[
{
}
]b4_parser_class_name::~b4_parser_class_name[ ()
{
}
/*---------------.
| Symbol types. |
`---------------*/
// symbol_base_type.
template <typename Exact>
]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type ()
: value()
, location()
{
}
template <typename Exact>
]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type (const semantic_type& v, const location_type& l)
: value(v)
, location(l)
{
}
template <typename Exact>
const Exact&
]b4_parser_class_name[::symbol_base_type<Exact>::self () const
{
return static_cast<const Exact&>(*this);
}
template <typename Exact>
Exact&
]b4_parser_class_name[::symbol_base_type<Exact>::self ()
{
return static_cast<Exact&>(*this);
}
template <typename Exact>
int
]b4_parser_class_name[::symbol_base_type<Exact>::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;
}
// stack_symbol_type.
]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
: super_type ()
, state ()
{
}
]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)
, state (s)
{
}
int
]b4_parser_class_name[::stack_symbol_type::type_get_ () const
{
return yystos_[state];
}
template <typename Exact>
void
]b4_parser_class_name[::yy_destroy_ (const char* yymsg,
symbol_base_type<Exact>& yysym) const
{
int yytype = yysym.type_get ();
YYUSE (yymsg);
if (yymsg)
YY_SYMBOL_PRINT (yymsg, yysym);
// User destructor.
switch (yytype)
{
]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
default:
break;
}]b4_variant_if([
// Type destructor.
b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[
}
#if YYDEBUG
template <typename Exact>
void
]b4_parser_class_name[::yy_print_ (std::ostream& yyo,
const symbol_base_type<Exact>& yysym) const
{
int yytype = yysym.type_get ();
yyo << (yytype < yyntokens_ ? "token" : "nterm")
<< ' ' << yytname_[yytype] << " ("
<< yysym.location << ": ";
switch (yytype)
{
]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))[
default:
break;
}
yyo << ')';
}
#endif
void
]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 (s, semantic_type(), sym.location));
]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]],
[build], [sym.value])],
[ yystack_.push (stack_symbol_type (s, sym.value, sym.location));])[
}
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 (s.state, semantic_type(), s.location));
]b4_symbol_variant([[yystos_[s.state]]], [[yystack_[0].value]],
[build], [s.value])],
[ yystack_.push (s);])[
}
void
]b4_parser_class_name[::yypop_ (unsigned int n)
{
yystack_.pop (n);
}
#if YYDEBUG
std::ostream&
]b4_parser_class_name[::debug_stream () const
{
return *yycdebug_;
}
void
]b4_parser_class_name[::set_debug_stream (std::ostream& o)
{
yycdebug_ = &o;
}
]b4_parser_class_name[::debug_level_type
]b4_parser_class_name[::debug_level () const
{
return yydebug_;
}
void
]b4_parser_class_name[::set_debug_level (debug_level_type l)
{
yydebug_ = l;
}
#endif
int
]b4_parser_class_name[::parse ()
{
/// Coded type of the lookahead.
int yychar = yyempty_;
/* State. */
int yyn;
int yylen = 0;
int yystate = 0;
/* Error handling. */
int yynerrs_ = 0;
int yyerrstatus_ = 0;
/// The lookahead symbol.
symbol_type yyla;
/// The locations where the error started and ended.
stack_symbol_type yyerror_range[2];
/// $$ and @@$.
stack_symbol_type yylhs;
/// The return value of parse().
int yyresult;
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_user_initial_action
m4_popdef([b4_dollar_dollar])dnl
m4_popdef([b4_at_dollar])])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_ (0, 0, yyla);
// A new state was pushed on the stack.
// Invariant: yystate == yystack_[0].state, i.e.,
// yystate was just pushed onto the state stack.
yynewstate:
YYCDEBUG << "Entering state " << yystate << std::endl;
/* Accept? */
if (yystate == yyfinal_)
goto yyacceptlab;
goto yybackup;
/* Backup. */
yybackup:
/* Try to take a decision without lookahead. */
yyn = yypact_[yystate];
if (yyn == yypact_ninf_)
goto yydefault;
/* Read a lookahead token. */
if (yychar == yyempty_)
{
YYCDEBUG << "Reading a token: ";
yychar = ]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);
}
/* 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)
goto yydefault;
/* Reduce or error. */
yyn = yytable_[yyn];
if (yyn <= 0)
{
if (yyn == 0 || yyn == yytable_ninf_)
goto yyerrlab;
yyn = -yyn;
goto yyreduce;
}
/* Discard the token being shifted. */
yychar = yyempty_;
/* Count tokens shifted since error; after three, turn off error
status. */
if (yyerrstatus_)
--yyerrstatus_;
/* Shift the lookahead token. */
yystate = yyn;
yypush_ ("Shifting", yystate, yyla);
goto yynewstate;
/*-----------------------------------------------------------.
| yydefault -- do the default action for the current state. |
`-----------------------------------------------------------*/
yydefault:
yyn = yydefact_[yystate];
if (yyn == 0)
goto yyerrlab;
goto yyreduce;
/*-----------------------------.
| yyreduce -- Do a reduction. |
`-----------------------------*/
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])[],[
/* If YYLEN is nonzero, implement the default value of the action:
`$$ = $1'. Otherwise, use the top of the stack.
Otherwise, the following line sets YYLHS.VALUE to garbage.
This behavior is undocumented and Bison
users should not rely upon it. */
if (yylen)
yylhs.value = yystack_@{yylen - 1@}.value;
else
yylhs.value = yystack_@{0@}.value;])[
// Compute the default @@$.
{
slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
YYLLOC_DEFAULT (yylhs.location, slice, yylen);
}
// Perform the reduction.
YY_REDUCE_PRINT (yyn);
switch (yyn)
{
]b4_user_actions[
default:
break;
}
// Compute post-reduction state.
yyn = yyr1_[yyn];
yystate = yypgoto_[yyn - yyntokens_] + yystack_[yylen].state;
if (0 <= yystate && yystate <= yylast_
&& yycheck_[yystate] == yystack_[yylen].state)
yystate = yytable_[yystate];
else
yystate = yydefgoto_[yyn - yyntokens_];
yylhs.state = yystate;
YY_SYMBOL_PRINT ("-> $$ =", yylhs);
]b4_variant_if([[
// Destroy the lhs 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.
yy_destroy_ (0, yystack_[i]);]])[
yypop_ (yylen);
yylen = 0;
YY_STACK_PRINT ();
/* Shift the result of the reduction. */
yypush_ (0, yylhs);
goto yynewstate;
/*------------------------------------.
| 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));
}
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_;
}
}
/* Else will try to reuse lookahead token after shifting the error
token. */
goto yyerrlab1;
/*---------------------------------------------------.
| yyerrorlab -- error raised explicitly by YYERROR. |
`---------------------------------------------------*/
yyerrorlab:
/* Pacify compilers like GCC when the user code never invokes
YYERROR and the label yyerrorlab therefore never appears in user
code. */
if (false)
goto yyerrorlab;
yyerror_range[0].location = yystack_[yylen - 1].location;
/* Do not reclaim the symbols of the rule which action triggered
this YYERROR. */
yypop_ (yylen);
yylen = 0;
yystate = yystack_[0].state;
goto yyerrlab1;
/*-------------------------------------------------------------.
| yyerrlab1 -- common code for both syntax error and YYERROR. |
`-------------------------------------------------------------*/
yyerrlab1:
yyerrstatus_ = 3; /* Each real token shifted decrements this. */
{
stack_symbol_type error_token;
for (;;)
{
yyn = yypact_[yystate];
if (yyn != yypact_ninf_)
{
yyn += yyterror_;
if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
{
yyn = yytable_[yyn];
if (0 < yyn)
break;
}
}
// Pop the current state because it cannot handle the error token.
if (yystack_.size () == 1)
YYABORT;
yyerror_range[0].location = yystack_[0].location;
yy_destroy_ ("Error: popping", yystack_[0]);
yypop_ ();
yystate = yystack_[0].state;
YY_STACK_PRINT ();
}
yyerror_range[1].location = yyla.location;
YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);
/* Shift the error token. */
error_token.state = yystate = yyn;
yypush_ ("Shifting", error_token);
}
goto yynewstate;
/* Accept. */
yyacceptlab:
yyresult = 0;
goto yyreturn;
/* Abort. */
yyabortlab:
yyresult = 1;
goto yyreturn;
yyreturn:
if (yychar != yyempty_)
yy_destroy_ ("Cleanup: discarding lookahead", yyla);
/* Do not reclaim the symbols of the rule which action triggered
this YYABORT or YYACCEPT. */
yypop_ (yylen);
while (yystack_.size () != 1)
{
yy_destroy_ ("Cleanup: popping", yystack_[0]);
yypop_ ();
}
return yyresult;
}
// Generate an error message.
std::string
]b4_parser_class_name[::yysyntax_error_ (int yystate, int]dnl
b4_error_verbose_if([ tok])[)
{
std::string res;
YYUSE (yystate);
#if YYERROR_VERBOSE
int yyn = yypact_[yystate];
if (yypact_ninf_ < yyn && yyn <= yylast_)
{
/* Start YYX at -YYN if negative to avoid negative indexes in
YYCHECK. */
int yyxbegin = yyn < 0 ? -yyn : 0;
/* 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]);
}
}
}
else
#endif
res = YY_("syntax error");
return res;
}
/* 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])[;
#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
/* 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_[] =
{
]b4_tname[
};
#endif
#if YYDEBUG
/* YYRLINE[YYN] -- Source line where rule number YYN was defined. */
]b4_table_define([rline], [b4_rline])[;
// Print the state stack on the debug stream.
void
]b4_parser_class_name[::yystack_print_ ()
{
*yycdebug_ << "Stack now";
for (stack_type::const_iterator
i = yystack_.begin (),
i_end = yystack_.end ();
i != i_end; ++i)
*yycdebug_ << ' ' << i->state;
*yycdebug_ << std::endl;
}
// Report on the debug stream that the rule \a yyrule is going to be reduced.
void
]b4_parser_class_name[::yy_reduce_print_ (int yyrule)
{
unsigned int yylno = yyrline_[yyrule];
int yynrhs = yyr2_[yyrule];
/* Print the symbols being reduced, and their result. */
*yycdebug_ << "Reducing stack by rule " << yyrule - 1
<< " (line " << yylno << "):" << std::endl;
/* The symbols being reduced. */
for (int yyi = 0; yyi < yynrhs; yyi++)
YY_SYMBOL_PRINT (" $" << yyi + 1 << " =",
]b4_rhs_data(yynrhs, yyi + 1)[);
}
#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<unsigned int> (t) <= user_token_number_max_)
return translate_table[t];
else
return undef_token_;
}
]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 <deque>
]b4_namespace_open[
template <class T, class S = std::deque<T> >
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 T, class S = stack<T> >
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
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