+2015-07-30 Tim Shen <timshen@google.com>
+
+ * include/bits/regex_automaton.h (_State_base, _State<>):
+ Remove _TraitsT dependency from _State<>; Make matcher member
+ into the union to reduce struct size.
+ * include/bits/regex_automaton.tcc (_State_base<>::_M_print,
+ _State_base<>::_M_dot, _StateSeq<>::_M_clone):
+ Adjust to fit the interface. Factor out common parts in
+ _M_clone as _State<>::_M_has_alt.
+ * include/bits/regex_executor.h (_Executer<>::_M_lookahead):
+ Only pass state id instead of the whole state.
+ * include/bits/regex_executor.tcc (_Executer<>::_M_dfs,
+ _Executer<>::_M_lookahead): Adjust to fit the interface.
+ * include/std/regex: Include <ext/aligned_buffer.h>
+
2015-07-30 Jonathan Wakely <jwakely@redhat.com>
* include/experimental/any (any::operator=(const any&)): Check for
struct _State_base
{
+ protected:
_Opcode _M_opcode; // type of outgoing transition
+
+ public:
_StateIdT _M_next; // outgoing transition
union // Since they are mutually exclusive.
{
// quantifiers (ungreedy if set true)
bool _M_neg;
};
+ // For _S_opcode_match
+ __gnu_cxx::__aligned_membuf<_Matcher<char>> _M_matcher_storage;
};
+ protected:
explicit _State_base(_Opcode __opcode)
: _M_opcode(__opcode), _M_next(_S_invalid_state_id)
{ }
- protected:
- ~_State_base() = default;
-
public:
+ bool
+ _M_has_alt()
+ {
+ return _M_opcode == _S_opcode_alternative
+ || _M_opcode == _S_opcode_repeat
+ || _M_opcode == _S_opcode_subexpr_lookahead;
+ }
+
#ifdef _GLIBCXX_DEBUG
std::ostream&
_M_print(std::ostream& ostr) const;
#endif
};
- template<typename _TraitsT>
+ template<typename _Char_type>
struct _State : _State_base
{
- typedef _Matcher<typename _TraitsT::char_type> _MatcherT;
+ typedef _Matcher<_Char_type> _MatcherT;
+ static_assert(sizeof(_MatcherT) == sizeof(_Matcher<char>),
+ "std::function<bool(T)> has the same size as "
+ "std::function<bool(char)>");
+ static_assert(alignof(_MatcherT) == alignof(_Matcher<char>),
+ "std::function<bool(T)> has the same alignment as "
+ "std::function<bool(char)>");
+
+ explicit
+ _State(_Opcode __opcode) : _State_base(__opcode)
+ {
+ if (_M_opcode() == _S_opcode_match)
+ new (this->_M_matcher_storage._M_addr()) _MatcherT();
+ }
- _MatcherT _M_matches; // for _S_opcode_match
+ _State(const _State& __rhs) : _State_base(__rhs)
+ {
+ if (__rhs._M_opcode() == _S_opcode_match)
+ new (this->_M_matcher_storage._M_addr())
+ _MatcherT(__rhs._M_get_matcher());
+ }
- explicit _State(_Opcode __opcode) : _State_base(__opcode) { }
+ _State(_State&& __rhs) : _State_base(__rhs)
+ {
+ if (__rhs._M_opcode() == _S_opcode_match)
+ new (this->_M_matcher_storage._M_addr())
+ _MatcherT(std::move(__rhs._M_get_matcher()));
+ }
+
+ _State&
+ operator=(const _State&) = delete;
+
+ ~_State()
+ {
+ if (_M_opcode() == _S_opcode_match)
+ _M_get_matcher().~_MatcherT();
+ }
+
+ // Since correct ctor and dtor rely on _M_opcode, it's better not to
+ // change it over time.
+ _Opcode
+ _M_opcode() const
+ { return _State_base::_M_opcode; }
+
+ bool
+ _M_matches(_Char_type __char) const
+ { return _M_get_matcher()(__char); }
+
+ _MatcherT&
+ _M_get_matcher()
+ { return *static_cast<_MatcherT*>(this->_M_matcher_storage._M_addr()); }
+
+ const _MatcherT&
+ _M_get_matcher() const
+ {
+ return *static_cast<const _MatcherT*>(
+ this->_M_matcher_storage._M_addr());
+ }
};
struct _NFA_base
template<typename _TraitsT>
struct _NFA
- : _NFA_base, std::vector<_State<_TraitsT>>
+ : _NFA_base, std::vector<_State<typename _TraitsT::char_type>>
{
- typedef _State<_TraitsT> _StateT;
- typedef _Matcher<typename _TraitsT::char_type> _MatcherT;
+ typedef typename _TraitsT::char_type _Char_type;
+ typedef _State<_Char_type> _StateT;
+ typedef _Matcher<_Char_type> _MatcherT;
_NFA(const typename _TraitsT::locale_type& __loc, _FlagT __flags)
: _NFA_base(__flags)
_M_insert_matcher(_MatcherT __m)
{
_StateT __tmp(_S_opcode_match);
- __tmp._M_matches = std::move(__m);
+ __tmp._M_get_matcher() = std::move(__m);
return _M_insert_state(std::move(__tmp));
}
{
for (auto& __it : *this)
{
- while (__it._M_next >= 0 && (*this)[__it._M_next]._M_opcode
+ while (__it._M_next >= 0 && (*this)[__it._M_next]._M_opcode()
== _S_opcode_dummy)
__it._M_next = (*this)[__it._M_next]._M_next;
- if (__it._M_opcode == _S_opcode_alternative
- || __it._M_opcode == _S_opcode_repeat
- || __it._M_opcode == _S_opcode_subexpr_lookahead)
- while (__it._M_alt >= 0 && (*this)[__it._M_alt]._M_opcode
+ if (__it._M_has_alt())
+ while (__it._M_alt >= 0 && (*this)[__it._M_alt]._M_opcode()
== _S_opcode_dummy)
__it._M_alt = (*this)[__it._M_alt]._M_next;
}
__stack.pop();
auto __dup = _M_nfa[__u];
// _M_insert_state() never return -1
- auto __id = _M_nfa._M_insert_state(__dup);
+ auto __id = _M_nfa._M_insert_state(std::move(__dup));
__m[__u] = __id;
- if (__dup._M_opcode == _S_opcode_alternative
- || __dup._M_opcode == _S_opcode_repeat
- || __dup._M_opcode == _S_opcode_subexpr_lookahead)
+ if (__dup._M_has_alt())
if (__dup._M_alt != _S_invalid_state_id
&& __m.count(__dup._M_alt) == 0)
__stack.push(__dup._M_alt);
_GLIBCXX_DEBUG_ASSERT(__m.count(__ref._M_next) > 0);
__ref._M_next = __m[__ref._M_next];
}
- if (__ref._M_opcode == _S_opcode_alternative
- || __ref._M_opcode == _S_opcode_repeat
- || __ref._M_opcode == _S_opcode_subexpr_lookahead)
+ if (__ref._M_has_alt())
if (__ref._M_alt != _S_invalid_state_id)
{
_GLIBCXX_DEBUG_ASSERT(__m.count(__ref._M_alt) > 0);
_M_word_boundary() const;
bool
- _M_lookahead(_State<_TraitsT> __state);
+ _M_lookahead(_StateIdT __next);
// Holds additional information used in BFS-mode.
template<typename _SearchMode, typename _ResultsVec>
template<typename _BiIter, typename _Alloc, typename _TraitsT,
bool __dfs_mode>
bool _Executor<_BiIter, _Alloc, _TraitsT, __dfs_mode>::
- _M_lookahead(_State<_TraitsT> __state)
+ _M_lookahead(_StateIdT __next)
{
_ResultsVec __what(_M_cur_results.size());
_Executor __sub(_M_current, _M_end, __what, _M_re, _M_flags);
- __sub._M_states._M_start = __state._M_alt;
+ __sub._M_states._M_start = __next;
if (__sub._M_search_from_first())
{
for (size_t __i = 0; __i < __what.size(); __i++)
const auto& __state = _M_nfa[__i];
// Every change on _M_cur_results and _M_current will be rolled back after
// finishing the recursion step.
- switch (__state._M_opcode)
+ switch (__state._M_opcode())
{
// _M_alt branch is "match once more", while _M_next is "get me out
// of this quantifier". Executing _M_next first or _M_alt first don't
// Here __state._M_alt offers a single start node for a sub-NFA.
// We recursively invoke our algorithm to match the sub-NFA.
case _S_opcode_subexpr_lookahead:
- if (_M_lookahead(__state) == !__state._M_neg)
+ if (_M_lookahead(__state._M_alt) == !__state._M_neg)
_M_dfs(__match_mode, __state._M_next);
break;
case _S_opcode_match:
#include <map>
#include <cstring>
+#include <ext/aligned_buffer.h>
#include <bits/regex_constants.h>
#include <bits/regex_error.h>
#include <bits/regex_automaton.h>
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