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Improve regex performance on msvc by removing statically allocated recursion stack, and using a std::vector instead.

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[SVN r59414]
This commit is contained in:
John Maddock
2010-02-01 13:10:28 +00:00
parent c8e56504d9
commit d686c89333
5 changed files with 63 additions and 51 deletions
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50
include/boost/regex/v4/perl_matcher_non_recursive.hpp
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@ -898,19 +898,20 @@ bool perl_matcher<BidiIterator, Allocator, traits>::match_recursion()
//
// Set new call stack:
//
if(recursion_stack_position >= static_cast<int>(sizeof(recursion_stack)/sizeof(recursion_stack[0])))
if(recursion_stack.capacity() == 0)
{
return false;
recursion_stack.reserve(50);
}
recursion_stack[recursion_stack_position].preturn_address = pstate->next.p;
recursion_stack[recursion_stack_position].results = *m_presult;
recursion_stack.push_back(recursion_info<results_type>());
recursion_stack.back().preturn_address = pstate->next.p;
recursion_stack.back().results = *m_presult;
if(static_cast<const re_recurse*>(pstate)->state_id > 0)
{
push_repeater_count(static_cast<const re_recurse*>(pstate)->state_id, &next_count);
}
pstate = static_cast<const re_jump*>(pstate)->alt.p;
recursion_stack[recursion_stack_position].id = static_cast<const re_brace*>(pstate)->index;
++recursion_stack_position;
recursion_stack.back().id = static_cast<const re_brace*>(pstate)->index;
//++recursion_stack_position;
//BOOST_ASSERT(recursion_stack[recursion_stack_position-1].id);
return true;
@ -927,14 +928,15 @@ bool perl_matcher<BidiIterator, Allocator, traits>::match_endmark()
{
m_presult->set_second(position, index);
}
if(recursion_stack_position)
if(!recursion_stack.empty())
{
if(index == recursion_stack[recursion_stack_position-1].id)
if(index == recursion_stack.back().id)
{
--recursion_stack_position;
pstate = recursion_stack[recursion_stack_position].preturn_address;
*m_presult = recursion_stack[recursion_stack_position].results;
push_recursion(recursion_stack[recursion_stack_position].id, recursion_stack[recursion_stack_position].preturn_address, &recursion_stack[recursion_stack_position].results);
//--recursion_stack_position;
pstate = recursion_stack.back().preturn_address;
*m_presult = recursion_stack.back().results;
push_recursion(recursion_stack.back().id, recursion_stack.back().preturn_address, &recursion_stack.back().results);
recursion_stack.pop_back();
}
}
}
@ -951,13 +953,14 @@ bool perl_matcher<BidiIterator, Allocator, traits>::match_endmark()
template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_match()
{
if(recursion_stack_position)
if(!recursion_stack.empty())
{
BOOST_ASSERT(0 == recursion_stack[recursion_stack_position-1].id);
--recursion_stack_position;
pstate = recursion_stack[recursion_stack_position].preturn_address;
*m_presult = recursion_stack[recursion_stack_position].results;
push_recursion(recursion_stack[recursion_stack_position].id, recursion_stack[recursion_stack_position].preturn_address, &recursion_stack[recursion_stack_position].results);
BOOST_ASSERT(0 == recursion_stack.back().id);
//--recursion_stack_position;
pstate = recursion_stack.back().preturn_address;
*m_presult = recursion_stack.back().results;
push_recursion(recursion_stack.back().id, recursion_stack.back().preturn_address, &recursion_stack.back().results);
recursion_stack.pop_back();
return true;
}
if((m_match_flags & match_not_null) && (position == (*m_presult)[0].first))
@ -1523,10 +1526,11 @@ bool perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion(bool r)
saved_recursion<results_type>* pmp = static_cast<saved_recursion<results_type>*>(m_backup_state);
if(!r)
{
recursion_stack[recursion_stack_position].id = pmp->recursion_id;
recursion_stack[recursion_stack_position].preturn_address = pmp->preturn_address;
recursion_stack[recursion_stack_position].results = pmp->results;
++recursion_stack_position;
recursion_stack.push_back(recursion_info<results_type>());
recursion_stack.back().id = pmp->recursion_id;
recursion_stack.back().preturn_address = pmp->preturn_address;
recursion_stack.back().results = pmp->results;
//++recursion_stack_position;
}
boost::re_detail::inplace_destroy(pmp++);
m_backup_state = pmp;
@ -1539,7 +1543,7 @@ bool perl_matcher<BidiIterator, Allocator, traits>::unwind_recursion_pop(bool r)
saved_state* pmp = static_cast<saved_state*>(m_backup_state);
if(!r)
{
--recursion_stack_position;
recursion_stack.pop_back();
}
boost::re_detail::inplace_destroy(pmp++);
m_backup_state = pmp;