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Use BufferCoord sentinel type for regex matching on BufferIterators

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BufferIterators are large-ish, and need to check the buffer pointer
on comparison. Checking against a coord is just a 64 bit comparison.
This commit is contained in:
Maxime Coste 2018-11-01 21:51:10 +11:00
parent 8a751e1b57
commit 6fce8050ee
4 changed files with 61 additions and 32 deletions
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5
src/buffer.hh
View File

@ -71,6 +71,9 @@ public:
bool operator> (const BufferIterator& iterator) const noexcept;
bool operator>= (const BufferIterator& iterator) const noexcept;
bool operator== (const BufferCoord& coord) const noexcept;
bool operator!= (const BufferCoord& coord) const noexcept;
const char& operator* () const noexcept;
const char& operator[](size_t n) const noexcept;
size_t operator- (const BufferIterator& iterator) const;
@ -88,6 +91,8 @@ public:
BufferIterator operator-- (int);
const BufferCoord& coord() const noexcept { return m_coord; }
explicit operator BufferCoord() const noexcept { return m_coord; }
using Sentinel = BufferCoord;
private:
SafePtr<const Buffer> m_buffer;

10
src/buffer.inl.hh
View File

@ -136,6 +136,16 @@ inline bool BufferIterator::operator>=(const BufferIterator& iterator) const noe
return (m_coord >= iterator.m_coord);
}
inline bool BufferIterator::operator==(const BufferCoord& coord) const noexcept
{
return m_coord == coord;
}
inline bool BufferIterator::operator!=(const BufferCoord& coord) const noexcept
{
return m_coord != coord;
}
[[gnu::always_inline]]
inline const char& BufferIterator::operator*() const noexcept
{

2
src/meta.hh
View File

@ -9,6 +9,8 @@ inline namespace Meta
struct AnyType{};
template<typename T> struct Type : AnyType {};
template<typename T> using void_t = void;
}
}

76
src/regex_impl.hh
View File

@ -154,6 +154,12 @@ enum class RegexExecFlags
constexpr bool with_bit_ops(Meta::Type<RegexExecFlags>) { return true; }
template<typename It, typename=void>
struct SentinelType { using Type = It; };
template<typename It>
struct SentinelType<It, void_t<typename It::Sentinel>> { using Type = typename It::Sentinel; };
template<typename Iterator, MatchDirection direction>
class ThreadedRegexVM
{
@ -206,25 +212,30 @@ public:
const ExecConfig config{
EffectiveIt{Utf8It{forward ? begin : end, subject_begin, subject_end}},
EffectiveIt{Utf8It{forward ? end : begin, subject_begin, subject_end}},
EffectiveIt{Utf8It{forward ? subject_begin : subject_end, subject_begin, subject_end}},
EffectiveIt{Utf8It{forward ? subject_end : subject_begin, subject_begin, subject_end}},
Sentinel{forward ? begin : end},
Sentinel{forward ? end : begin},
Sentinel{forward ? subject_begin : subject_end},
Sentinel{forward ? subject_end : subject_begin},
flags,
instructions
};
EffectiveIt start{config.begin};
EffectiveIt start{Utf8It{
forward ? begin : end,
Sentinel{subject_begin},
Sentinel{subject_end}
}};
if (const auto& start_desc = direction == MatchDirection::Forward ?
m_program.forward_start_desc : m_program.backward_start_desc)
{
if (search)
{
to_next_start(start, config.end, *start_desc);
if (start == config.end) // If start_desc is not null, it means we consume at least one char
if (base(start) == config.end) // If start_desc is not null, it means we consume at least one char
return false;
}
else if (start != config.end and
else if (base(start) != config.end and
not start_desc->map[*start < StartDesc::count ? *start : StartDesc::other])
return false;
}
@ -293,16 +304,17 @@ private:
};
using StartDesc = CompiledRegex::StartDesc;
using Utf8It = utf8::iterator<Iterator>;
using Sentinel = typename SentinelType<Iterator>::Type;
using Utf8It = utf8::iterator<Iterator, Sentinel>;
using EffectiveIt = std::conditional_t<direction == MatchDirection::Forward,
Utf8It, std::reverse_iterator<Utf8It>>;
struct ExecConfig
{
const EffectiveIt begin;
const EffectiveIt end;
const EffectiveIt subject_begin;
const EffectiveIt subject_end;
const Sentinel begin;
const Sentinel end;
const Sentinel subject_begin;
const Sentinel subject_end;
const RegexExecFlags flags;
ConstArrayView<CompiledRegex::Instruction> instructions;
};
@ -326,17 +338,17 @@ private:
switch (inst.op)
{
case CompiledRegex::Literal:
if (pos != config.end and inst.param == *pos)
if (base(pos) != config.end and inst.param == *pos)
return StepResult::Consumed;
return StepResult::Failed;
case CompiledRegex::Literal_IgnoreCase:
if (pos != config.end and inst.param == to_lower(*pos))
if (base(pos) != config.end and inst.param == to_lower(*pos))
return StepResult::Consumed;
return StepResult::Failed;
case CompiledRegex::AnyChar:
return StepResult::Consumed;
case CompiledRegex::AnyCharExceptNewLine:
if (pos != config.end and *pos != '\n')
if (base(pos) != config.end and *pos != '\n')
return StepResult::Consumed;
return StepResult::Failed;
case CompiledRegex::Jump:
@ -368,16 +380,16 @@ private:
--m_saves[thread.saves]->refcount;
thread.saves = new_saves<true>(m_saves[thread.saves]->pos);
}
m_saves[thread.saves]->pos[inst.param] = get_base(pos);
m_saves[thread.saves]->pos[inst.param] = base(pos);
break;
}
case CompiledRegex::Class:
if (pos == config.end)
if (base(pos) == config.end)
return StepResult::Failed;
return is_character_class(m_program.character_classes[inst.param], *pos) ?
StepResult::Consumed : StepResult::Failed;
case CompiledRegex::CharacterType:
if (pos == config.end)
if (base(pos) == config.end)
return StepResult::Failed;
return is_ctype((CharacterType)inst.param, *pos) ?
StepResult::Consumed : StepResult::Failed;
@ -398,11 +410,11 @@ private:
return StepResult::Failed;
break;
case CompiledRegex::SubjectBegin:
if (pos != config.subject_begin)
if (base(pos) != config.subject_begin)
return StepResult::Failed;
break;
case CompiledRegex::SubjectEnd:
if (pos != config.subject_end)
if (base(pos) != config.subject_end)
return StepResult::Failed;
break;
case CompiledRegex::LookAhead:
@ -470,8 +482,8 @@ private:
switch (step(pos, current_step, thread, config))
{
case StepResult::Matched:
if ((pos != config.end and not (config.flags & RegexExecFlags::Search)) or
(config.flags & RegexExecFlags::NotInitialNull and pos == config.begin))
if ((base(pos) != config.end and not (config.flags & RegexExecFlags::Search)) or
(config.flags & RegexExecFlags::NotInitialNull and base(pos) == config.begin))
{
release_saves(thread.saves);
continue;
@ -506,7 +518,7 @@ private:
for (auto& thread : m_threads.next_threads())
m_program.instructions[thread.inst].scheduled = false;
if (pos == config.end or m_threads.next_is_empty() or
if (base(pos) == config.end or m_threads.next_is_empty() or
(found_match and (config.flags & RegexExecFlags::AnyMatch)))
{
for (auto& t : m_threads.next_threads())
@ -523,9 +535,9 @@ private:
}
}
void to_next_start(EffectiveIt& start, const EffectiveIt& end, const StartDesc& start_desc)
void to_next_start(EffectiveIt& start, const Sentinel& end, const StartDesc& start_desc)
{
while (start != end)
while (base(start) != end)
{
const Codepoint cp = read(start);
if (start_desc.map[(cp >= 0 and cp < StartDesc::count) ? cp : StartDesc::other])
@ -544,7 +556,7 @@ private:
const auto end = (look_direction == MatchDirection::Forward ? config.subject_end : config.subject_begin);
for (auto it = m_program.lookarounds.begin() + index; *it != Lookaround::EndOfLookaround; ++it)
{
if (pos == end)
if (base(pos) == end)
return false;
Codepoint cp = (look_direction == MatchDirection::Forward ? *pos : *(pos-1));
if (ignore_case)
@ -580,23 +592,23 @@ private:
static bool is_line_start(const EffectiveIt& pos, const ExecConfig& config)
{
if (pos == config.subject_begin)
if (base(pos) == config.subject_begin)
return not (config.flags & RegexExecFlags::NotBeginOfLine);
return *(pos-1) == '\n';
}
static bool is_line_end(const EffectiveIt& pos, const ExecConfig& config)
{
if (pos == config.subject_end)
if (base(pos) == config.subject_end)
return not (config.flags & RegexExecFlags::NotEndOfLine);
return *pos == '\n';
}
static bool is_word_boundary(const EffectiveIt& pos, const ExecConfig& config)
{
if (pos == config.subject_begin)
if (base(pos) == config.subject_begin)
return not (config.flags & RegexExecFlags::NotBeginOfWord);
if (pos == config.subject_end)
if (base(pos) == config.subject_end)
return not (config.flags & RegexExecFlags::NotEndOfWord);
return is_word(*(pos-1)) != is_word(*pos);
}
@ -604,8 +616,8 @@ private:
static Codepoint read(Utf8It& it) { return it.read(); }
static Codepoint read(std::reverse_iterator<Utf8It>& it) { Codepoint cp = *it; ++it; return cp; }
static const Iterator& get_base(const Utf8It& it) { return it.base(); }
static Iterator get_base(const std::reverse_iterator<Utf8It>& it) { return it.base().base(); }
static const Iterator& base(const Utf8It& it) { return it.base(); }
static Iterator base(const std::reverse_iterator<Utf8It>& it) { return it.base().base(); }
const CompiledRegex& m_program;