[gcc r12-2825] libstdc++: Reduce use of debug containers in <regex>
Jonathan Wakely
redi@gcc.gnu.org
Mon Aug 9 19:47:03 GMT 2021
https://gcc.gnu.org/g:f5a2d78072fc161e8ca3117126030041f1503c3f
commit r12-2825-gf5a2d78072fc161e8ca3117126030041f1503c3f
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Mon Aug 9 11:49:09 2021 +0100
libstdc++: Reduce use of debug containers in <regex>
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>.
Diff:
---
libstdc++-v3/include/bits/regex.h | 28 ++++++++++++++-------------
libstdc++-v3/include/bits/regex.tcc | 6 +++---
libstdc++-v3/include/bits/regex_automaton.tcc | 4 ++--
libstdc++-v3/include/bits/regex_compiler.h | 8 ++++----
libstdc++-v3/include/bits/regex_executor.h | 6 +++---
libstdc++-v3/include/std/regex | 3 +++
6 files changed, 30 insertions(+), 25 deletions(-)
diff --git a/libstdc++-v3/include/bits/regex.h b/libstdc++-v3/include/bits/regex.h
index ac10fa184c6..b8a0ad251d8 100644
--- a/libstdc++-v3/include/bits/regex.h
+++ b/libstdc++-v3/include/bits/regex.h
@@ -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
diff --git a/libstdc++-v3/include/bits/regex.tcc b/libstdc++-v3/include/bits/regex.tcc
index 39ad3f0a4cc..c8bdd377c18 100644
--- a/libstdc++-v3/include/bits/regex.tcc
+++ b/libstdc++-v3/include/bits/regex.tcc
@@ -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
diff --git a/libstdc++-v3/include/bits/regex_automaton.tcc b/libstdc++-v3/include/bits/regex_automaton.tcc
index 0977f778922..69f3ee5ba3c 100644
--- a/libstdc++-v3/include/bits/regex_automaton.tcc
+++ b/libstdc++-v3/include/bits/regex_automaton.tcc
@@ -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())
{
diff --git a/libstdc++-v3/include/bits/regex_compiler.h b/libstdc++-v3/include/bits/regex_compiler.h
index bf7dcc54dba..5b4f2ae3558 100644
--- a/libstdc++-v3/include/bits/regex_compiler.h
+++ b/libstdc++-v3/include/bits/regex_compiler.h
@@ -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;
diff --git a/libstdc++-v3/include/bits/regex_executor.h b/libstdc++-v3/include/bits/regex_executor.h
index 014b4e83064..3422893371a 100644
--- a/libstdc++-v3/include/bits/regex_executor.h
+++ b/libstdc++-v3/include/bits/regex_executor.h
@@ -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?
diff --git a/libstdc++-v3/include/std/regex b/libstdc++-v3/include/std/regex
index 04fb8b2d971..2c94fa306c2 100644
--- a/libstdc++-v3/include/std/regex
+++ b/libstdc++-v3/include/std/regex
@@ -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>
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