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libstdc++: Reduce use of debug containers in <regex>

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The std::regex code uses std::map and std::vector, which means that when
_GLIBCXX_DEBUG is defined it uses the debug versions of those
containers. That no longer compiles, because I changed <regex> to
include <bits/stl_map.h> and <bits/stl_vector.h> instead of <map> and
<vector>, so the debug versions aren't defined, and std::map doesn't
compile. There is also a use of std::stack, which defaults to std::deque
which is the debug deque when _GLIBCXX_DEBUG is defined.

Using std::map, std::vector, and std::deque is probably a mistake, and
we should qualify them with _GLIBCXX_STD_C instead so that the debug
versions aren't used. We do not need the overhead of checking our own
uses of those containers, which should be correct anyway. The exception
is the vector base class of std::match_results, which exposes iterators
to users, so can benefit from debug mode checks for its iterators. For
other accesses to the vector elements, match_results already does its
own checks, so can access the _GLIBCXX_STD_C::vector base class
directly.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* include/bits/regex.h (basic_regex::transform_primary): Use
	_GLIBCXX_STD_C::vector for local variable.
	* include/bits/regex.tcc (__regex_algo_impl): Use reference to
	_GLIBCXX_STD_C::vector base class of match_results.
	* include/bits/regex_automaton.tcc (_StateSeq:_M_clone): Use
	_GLIBCXX_STD_C::map and _GLIBCXX_STD_C::deque for local
	variables.
	* include/bits/regex_compiler.h (_BracketMatcher): Use
	_GLIBCXX_STD_C::vector for data members.
	* include/bits/regex_executor.h (_Executor): Likewise.
	* include/std/regex [_GLIBCXX_DEBUG]: Include <debug/vector>.
This commit is contained in:
Jonathan Wakely 2021-08-09 11:49:09 +01:00
parent 1354603bf7
commit f5a2d78072
6 changed files with 30 additions and 25 deletions
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28
libstdc++-v3/include/bits/regex.h
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@ -257,7 +257,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
// for details.
typedef std::ctype<char_type> __ctype_type;
const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
std::vector<char_type> __s(__first, __last);
_GLIBCXX_STD_C::vector<char_type> __s(__first, __last);
__fctyp.tolower(__s.data(), __s.data() + __s.size());
return this->transform(__s.data(), __s.data() + __s.size());
}
@ -1697,6 +1697,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
* [n+3] suffix
*/
typedef std::vector<sub_match<_Bi_iter>, _Alloc> _Base_type;
// In debug mode _Base_type is the debug vector, this is the unsafe one:
typedef _GLIBCXX_STD_C::vector<sub_match<_Bi_iter>, _Alloc> _Unchecked;
typedef std::iterator_traits<_Bi_iter> __iter_traits;
typedef regex_constants::match_flag_type match_flag_type;
@ -1773,7 +1775,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
* @retval true The object has a fully-established result state.
* @retval false The object is not ready.
*/
bool ready() const noexcept { return !_Base_type::empty(); }
bool ready() const noexcept { return !_Unchecked::empty(); }
/**
* @name 28.10.2 Size
@ -1791,11 +1793,11 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
*/
size_type
size() const noexcept
{ return _Base_type::empty() ? 0 : _Base_type::size() - 3; }
{ return _Unchecked::empty() ? 0 : _Unchecked::size() - 3; }
size_type
max_size() const noexcept
{ return _Base_type::max_size() - 3; }
{ return _Unchecked::max_size() - 3; }
/**
* @brief Indicates if the %match_results contains no results.
@ -1869,7 +1871,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
{
__glibcxx_assert( ready() );
return __sub < size()
? _Base_type::operator[](__sub)
? _Unchecked::operator[](__sub)
: _M_unmatched_sub();
}
@ -2045,7 +2047,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
// (plus additional objects for prefix, suffix and unmatched sub).
void
_M_resize(unsigned int __size)
{ _Base_type::assign(__size + 3, sub_match<_Bi_iter>{}); }
{ _Unchecked::assign(__size + 3, sub_match<_Bi_iter>{}); }
// Set state to a failed match for the given past-the-end iterator.
void
@ -2053,32 +2055,32 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
{
sub_match<_Bi_iter> __sm;
__sm.first = __sm.second = __end;
_Base_type::assign(3, __sm);
_Unchecked::assign(3, __sm);
}
const_reference
_M_unmatched_sub() const
{ return _Base_type::operator[](_Base_type::size() - 3); }
{ return _Unchecked::operator[](_Unchecked::size() - 3); }
sub_match<_Bi_iter>&
_M_unmatched_sub()
{ return _Base_type::operator[](_Base_type::size() - 3); }
{ return _Unchecked::operator[](_Unchecked::size() - 3); }
const_reference
_M_prefix() const
{ return _Base_type::operator[](_Base_type::size() - 2); }
{ return _Unchecked::operator[](_Unchecked::size() - 2); }
sub_match<_Bi_iter>&
_M_prefix()
{ return _Base_type::operator[](_Base_type::size() - 2); }
{ return _Unchecked::operator[](_Unchecked::size() - 2); }
const_reference
_M_suffix() const
{ return _Base_type::operator[](_Base_type::size() - 1); }
{ return _Unchecked::operator[](_Unchecked::size() - 1); }
sub_match<_Bi_iter>&
_M_suffix()
{ return _Base_type::operator[](_Base_type::size() - 1); }
{ return _Unchecked::operator[](_Unchecked::size() - 1); }
_Bi_iter _M_begin;
/// @endcond

6
libstdc++-v3/include/bits/regex.tcc
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@ -56,7 +56,7 @@ namespace __detail
if (__re._M_automaton == nullptr)
return false;
typename match_results<_BiIter, _Alloc>::_Base_type& __res = __m;
typename match_results<_BiIter, _Alloc>::_Unchecked& __res = __m;
__m._M_begin = __s;
__m._M_resize(__re._M_automaton->_M_sub_count());
@ -66,7 +66,7 @@ namespace __detail
&& !__re._M_automaton->_M_has_backref))
{
_Executor<_BiIter, _Alloc, _TraitsT, false>
__executor(__s, __e, __m, __re, __flags);
__executor(__s, __e, __res, __re, __flags);
if (__match_mode)
__ret = __executor._M_match();
else
@ -75,7 +75,7 @@ namespace __detail
else
{
_Executor<_BiIter, _Alloc, _TraitsT, true>
__executor(__s, __e, __m, __re, __flags);
__executor(__s, __e, __res, __re, __flags);
if (__match_mode)
__ret = __executor._M_match();
else

4
libstdc++-v3/include/bits/regex_automaton.tcc
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@ -194,8 +194,8 @@ namespace __detail
_StateSeq<_TraitsT>
_StateSeq<_TraitsT>::_M_clone()
{
std::map<_StateIdT, _StateIdT> __m;
std::stack<_StateIdT> __stack;
_GLIBCXX_STD_C::map<_StateIdT, _StateIdT> __m;
std::stack<_StateIdT, _GLIBCXX_STD_C::deque<_StateIdT>> __stack;
__stack.push(_M_start);
while (!__stack.empty())
{

8
libstdc++-v3/include/bits/regex_compiler.h
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@ -538,10 +538,10 @@ namespace __detail
{ }
private:
std::vector<_CharT> _M_char_set;
std::vector<_StringT> _M_equiv_set;
std::vector<pair<_StrTransT, _StrTransT>> _M_range_set;
std::vector<_CharClassT> _M_neg_class_set;
_GLIBCXX_STD_C::vector<_CharT> _M_char_set;
_GLIBCXX_STD_C::vector<_StringT> _M_equiv_set;
_GLIBCXX_STD_C::vector<pair<_StrTransT, _StrTransT>> _M_range_set;
_GLIBCXX_STD_C::vector<_CharClassT> _M_neg_class_set;
_CharClassT _M_class_set;
_TransT _M_translator;
const _TraitsT& _M_traits;

6
libstdc++-v3/include/bits/regex_executor.h
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@ -60,7 +60,7 @@ namespace __detail
public:
typedef typename iterator_traits<_BiIter>::value_type _CharT;
typedef basic_regex<_CharT, _TraitsT> _RegexT;
typedef std::vector<sub_match<_BiIter>, _Alloc> _ResultsVec;
typedef _GLIBCXX_STD_C::vector<sub_match<_BiIter>, _Alloc> _ResultsVec;
typedef regex_constants::match_flag_type _FlagT;
typedef typename _TraitsT::char_class_type _ClassT;
typedef _NFA<_TraitsT> _NFAT;
@ -215,7 +215,7 @@ namespace __detail
_BiIter* _M_get_sol_pos() { return nullptr; }
// Saves states that need to be considered for the next character.
vector<pair<_StateIdT, _ResultsVec>> _M_match_queue;
_GLIBCXX_STD_C::vector<pair<_StateIdT, _ResultsVec>> _M_match_queue;
// Indicates which states are already visited.
bool* _M_visited_states;
// To record current solution.
@ -248,7 +248,7 @@ namespace __detail
const _RegexT& _M_re;
const _NFAT& _M_nfa;
_ResultsVec& _M_results;
vector<pair<_BiIter, int>> _M_rep_count;
_GLIBCXX_STD_C::vector<pair<_BiIter, int>> _M_rep_count;
_State_info<__search_mode, _ResultsVec> _M_states;
_FlagT _M_flags;
// Do we have a solution so far?

3
libstdc++-v3/include/std/regex
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@ -55,6 +55,9 @@
#include <bits/stl_vector.h>
#include <bits/stl_bvector.h>
#include <bits/vector.tcc>
#ifdef _GLIBCXX_DEBUG
# include <debug/vector>
#endif
#include <bits/regex_constants.h>
#include <bits/regex_error.h>
#include <bits/regex_automaton.h>