# C++ skeleton for Bison
-# Copyright (C) 2002-2013 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)
# --------------------------------------------------------------
};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])
# --------------------
m4_pushdef([b4_copyright_years],
- [2002-2013])
+ [2002-2015])
m4_define([b4_parser_class_name],
[b4_percent_define_get([[parser_class_name]])])
m4_define([b4_shared_declarations],
[b4_percent_code_get([[requires]])[
]b4_parse_assert_if([# include <cassert>])[
-# include <cstdlib> // abort
-# include <vector>
+# include <cstdlib> // std::abort
# include <iostream>
# include <stdexcept>
-# include <string>]b4_defines_if([[
+# include <string>
+# include <vector>]b4_defines_if([[
# include "stack.hh"
]b4_bison_locations_if([[# include "location.hh"]])])[
]b4_variant_if([b4_variant_includes])[
+]b4_attribute_define[
]b4_YYDEBUG_define[
]b4_namespace_open[
#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
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 inline token_number_type yytranslate_ (]b4_token_ctor_if([token_type], [int])[ t);
+ static token_number_type yytranslate_ (]b4_token_ctor_if([token_type], [int])[ t);
// Tables.
]b4_parser_tables_declare[]b4_error_verbose_if([
/// \param yyo The output stream.
/// \param yysym The symbol.
template <typename Base>
- void yy_print_ (std::ostream& yyo,
- const basic_symbol<Base>& yysym) const;
+ 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.
+ /// \param yysym The symbol.
template <typename Base>
- inline void yy_destroy_ (const char* yymsg,
- basic_symbol<Base>& yysym) const;
+ void yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const;
private:
/// Type access provider for state based symbols.
struct by_state
{
/// Default constructor.
- inline by_state ();
+ by_state ();
+
+ /// The symbol type as needed by the constructor.
+ typedef state_type kind_type;
/// Constructor.
- inline by_state (state_type s);
+ by_state (kind_type s);
/// Copy constructor.
- inline by_state (const by_state& other);
+ by_state (const by_state& other);
- /// The state.
- state_type state;
+ /// Record that this symbol is empty.
+ void clear ();
+
+ /// Steal the symbol type from \a that.
+ void move (by_state& that);
- /// The type (corresponding to \a state).
- inline int type_get () const;
+ /// The (internal) type number (corresponding to \a state).
+ /// \a empty_symbol when empty.
+ symbol_number_type type_get () const;
- typedef state_type value_type;
+ /// The state number used to denote an empty symbol.
+ enum { empty_state = -1 };
+
+ /// The state.
+ /// \a empty when empty.
+ state_type state;
};
/// "Internal" symbol: element of the stack.
- typedef basic_symbol<by_state> stack_symbol_type;
+ 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.
typedef stack<stack_symbol_type> 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 int 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[
#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
]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[ ()
- {
- }
+ {}
/*---------------.
]b4_token_ctor_if([], [b4_public_types_define])[
// by_state.
+ inline
]b4_parser_class_name[::by_state::by_state ()
- : 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;
+ }
+
+ inline
+ void
+ ]b4_parser_class_name[::by_state::move (by_state& that)
+ {
+ state = that.state;
+ that.clear ();
+ }
+
+ inline
]b4_parser_class_name[::by_state::by_state (state_type s)
: state (s)
{}
- int
+ inline
+ ]b4_parser_class_name[::symbol_number_type
]b4_parser_class_name[::by_state::type_get () const
{
- return yystos_[state];
+ 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])[)
+ {
+ ]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 Base>
+ inline
void
- ]b4_parser_class_name[::yy_destroy_ (const char* yymsg,
- basic_symbol<Base>& 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
{
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(
-[[
- stack_symbol_type ss (]b4_join([s],
- [sym.value], b4_locations_if([sym.location]))[);
- ]b4_symbol_variant([sym.type_get ()], [sym.value], [destroy], [])[;
- yystack_.push (ss);
-]],
-[[ yystack_.push (stack_symbol_type (]b4_join([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(
-[[
- stack_symbol_type ss (]b4_join([s.state],
- [s.value], b4_locations_if([s.location]))[);
- ]b4_symbol_variant([s.type_get ()], [s.value], [destroy], [])[;
- yystack_.push (ss);
-]],
-[ yystack_.push (s);])[
+ yystack_.push (s);
}
+ inline
void
]b4_parser_class_name[::yypop_ (unsigned int 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.
int yyn;
+ /// Length of the RHS of the rule being reduced.
int yylen = 0;
// Error handling.
/// The locations where the error started and ended.
stack_symbol_type yyerror_range[3];]])[
- /// $$ and @@$.
- stack_symbol_type yylhs;
-
/// The return value of parse ().
int yyresult;
yynewstate, since the latter expects the semantical and the
location values to have been already stored, initialize these
stacks with a primary value. */
- yystack_ = stack_type (0);
- yypush_ (YY_NULL, 0, yyla);
+ yystack_.clear ();
+ yypush_ (YY_NULLPTR, 0, yyla);
// A new symbol was pushed on the stack.
yynewstate:
goto yydefault;
// Read a lookahead token.
- if (yyempty)
+ if (yyla.empty ())
{
YYCDEBUG << "Reading a token: ";
try
error (yyexc);
goto yyerrlab1;
}
- yyempty = false;
}
YY_SYMBOL_PRINT ("Next token is", yyla);
/* If the proper action on seeing token YYLA.TYPE is to reduce or
to detect an error, take that action. */
- yyn += yyla.type;
- if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type)
+ yyn += yyla.type_get ();
+ if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type_get ())
goto yydefault;
// Reduce or error.
goto yyreduce;
}
- // Discard the token being shifted.
- yyempty = true;
-
// Count tokens shifted since error; after three, turn off error status.
if (yyerrstatus_)
--yyerrstatus_;
`-----------------------------*/
yyreduce:
yylen = yyr2_[yyn];
- yylhs.state = yy_lr_goto_state_(yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([
- /* Variants are always initialized to an empty instance of the
- correct type. The default $$=$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: '$$ = $1'. Otherwise, use the top of the stack.
+
+ Otherwise, the following line sets YYLHS.VALUE to garbage.
+ This behavior is undocumented and Bison users should not rely
+ upon it. */
+ if (yylen)
+ yylhs.value = yystack_@{yylen - 1@}.value;
+ else
+ yylhs.value = yystack_@{0@}.value;])[
]b4_locations_if([dnl
[
- // Compute the default @@$.
- {
- slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
- YYLLOC_DEFAULT (yylhs.location, slice, yylen);
- }]])[
-
- // Perform the reduction.
- YY_REDUCE_PRINT (yyn);
- try
- {
- switch (yyn)
- {
-]b4_user_actions[
- default:
- break;
- }
- }
- catch (const syntax_error& yyexc)
+ // Compute the default @@$.
{
- error (yyexc);
- YYERROR;
- }
- YY_SYMBOL_PRINT ("-> $$ =", yylhs);
-]b4_variant_if([[
- // Destroy the rhs symbols.
- for (int i = 0; i < yylen; ++i)
- // Destroy a variant whose value may have been swapped with
- // yylhs.value (for instance if the action was "std::swap($$,
- // $1)"). The value of yylhs.value (hence possibly one of these
- // rhs symbols) depends on the default construction for this
- // type. In the case of pointers for instance, no
- // initialization is done, so the value is junk. Therefore do
- // not try to report the value of symbols about to be destroyed
- // in the debug trace, it's possibly junk. Hence yymsg = 0.
- // Besides, that keeps exactly the same traces as with the other
- // Bison skeletons.
- yy_destroy_ (YY_NULL, yystack_[i]);]])[
+ slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
+ YYLLOC_DEFAULT (yylhs.location, slice, yylen);
+ }]])[
- yypop_ (yylen);
- yylen = 0;
- YY_STACK_PRINT ();
+ // Perform the reduction.
+ YY_REDUCE_PRINT (yyn);
+ try
+ {
+ switch (yyn)
+ {
+]b4_user_actions[
+ default:
+ break;
+ }
+ }
+ catch (const syntax_error& yyexc)
+ {
+ error (yyexc);
+ YYERROR;
+ }
+ YY_SYMBOL_PRINT ("-> $$ =", yylhs);
+ 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;
/*--------------------------------------.
{
++yynerrs_;
error (]b4_join(b4_locations_if([yyla.location]),
- [[yysyntax_error_ (yystack_[0].state,
- yyempty ? yyempty_ : yyla.type)]])[);
+ [[yysyntax_error_ (yystack_[0].state, yyla)]])[);
}
]b4_locations_if([[
error, discard it. */
// Return failure if at end of input.
- if (yyla.type == yyeof_)
+ if (yyla.type_get () == yyeof_)
YYABORT;
- else if (!yyempty)
+ else if (!yyla.empty ())
{
yy_destroy_ ("Error: discarding", yyla);
- yyempty = true;
+ yyla.clear ();
}
}
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);]])[
+ yyerror_range[1].location = yystack_[yylen - 1].location;]])[
/* Do not reclaim the symbols of the rule whose action triggered
this YYERROR. */
yypop_ (yylen);
goto yyreturn;
yyreturn:
- if (!yyempty)
+ if (!yyla.empty ())
yy_destroy_ ("Cleanup: discarding lookahead", yyla);
/* Do not reclaim the symbols of the rule whose action triggered
<< std::endl;
// Do not try to display the values of the reclaimed symbols,
// as their printer might throw an exception.
- if (!yyempty)
- yy_destroy_ (YY_NULL, yyla);
+ if (!yyla.empty ())
+ yy_destroy_ (YY_NULLPTR, yyla);
while (1 < yystack_.size ())
{
- yy_destroy_ (YY_NULL, yystack_[0]);
+ yy_destroy_ (YY_NULLPTR, yystack_[0]);
yypop_ ();
}
throw;
// 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))
}
}
- char const* yyformat = YY_NULL;
+ char const* yyformat = YY_NULLPTR;
switch (yycount)
{
#define YYCASE_(N, S) \
#undef YYCASE_
}
+ std::string yyres;
// Argument number.
size_t yyi = 0;
for (char const* yyp = yyformat; *yyp; ++yyp)
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