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ircd::spirit: Eliminate buffer construction frequent allocation.

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This commit is contained in:
Jason Volk 2020-08-28 01:20:22 -07:00
parent 1422b68666
commit 8e7002a4b6
2 changed files with 37 additions and 5 deletions
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34
include/ircd/spirit.h
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@ -178,6 +178,7 @@ __attribute__((visibility("default")))
{
// parse.cc
extern thread_local char rule_buffer[64];
extern thread_local char generator_buffer[8][64_KiB];
extern thread_local struct generator_state *generator_state;
}}
@ -325,6 +326,9 @@ ircd::spirit::expectation_failure<parent>::expectation_failure(const qi::expecta
struct [[gnu::visibility("hidden")]]
ircd::spirit::generator_state
{
/// The number of instances stacked behind the current state
static size_t depth() noexcept;
/// User's buffer.
mutable_buffer &out;
@ -339,6 +343,17 @@ ircd::spirit::generator_state
size_t generated {0};
};
inline size_t
ircd::spirit::generator_state::depth()
noexcept
{
size_t ret(0);
for(auto p(ircd::spirit::generator_state); p; p = p->prev)
++ret;
return ret;
}
template<bool truncation,
class gen,
class... attr>
@ -470,9 +485,20 @@ struct boost::spirit::karma::detail::enable_buffering<ircd::spirit::sink_type>
0
};
ircd::unique_mutable_buffer buffer
size_t depth
{
std::min(width, 65536UL)
ircd::spirit::generator_state::depth()
};
ircd::mutable_buffer buffer
{
depth?
ircd::spirit::generator_buffer[depth - 1]:
data(ircd::spirit::generator_state->out),
depth?
size(ircd::spirit::generator_state->out):
std::min(width, sizeof(ircd::spirit::generator_buffer[depth])),
};
struct ircd::spirit::generator_state state
@ -547,8 +573,8 @@ struct boost::spirit::karma::detail::enable_buffering<ircd::spirit::sink_type>
const ircd::mutable_buffer dst
{
data(prev.out) - (prev_base? state.consumed: 0),
prev_base? state.consumed: size(prev.out)
data(prev.out) - (prev_base? state.consumed: -prev.consumed),
prev_base? state.consumed: (size(prev.out) - prev.consumed)
};
const auto copied

8
ircd/parse.cc
View file

@ -25,7 +25,13 @@
thread_local
decltype(ircd::spirit::rule_buffer)
ircd::spirit::rule_buffer;
ircd::spirit::rule_buffer
alignas(64);
thread_local
decltype(ircd::spirit::generator_buffer)
ircd::spirit::generator_buffer
alignas(64);
thread_local
decltype(ircd::spirit::generator_state)