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Minor refacor of wrapped failures cache

This commit is contained in:
Alex Orlenko 2021-09-20 20:47:22 +01:00
parent e42d67c70d
commit 01154c0616
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GPG Key ID: 4C150C250863B96D
1 changed files with 21 additions and 20 deletions
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41
src/lua.rs
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@ -76,9 +76,8 @@ struct ExtraData {
ref_stack_top: c_int,
ref_free: Vec<c_int>,
// Vec of preallocated `WrappedFailure` enums
// Used for callbacks optimization
prealloc_wrapped_failures: Vec<c_int>,
// Pool of preallocated `WrappedFailure` enums
wrapped_failures_pool: Vec<c_int>,
hook_callback: Option<HookCallback>,
}
@ -153,6 +152,8 @@ pub(crate) static ASYNC_POLL_PENDING: u8 = 0;
pub(crate) static WAKER_REGISTRY_KEY: u8 = 0;
pub(crate) static EXTRA_REGISTRY_KEY: u8 = 0;
const WRAPPED_FAILURES_POOL_SIZE: usize = 16;
/// Requires `feature = "send"`
#[cfg(feature = "send")]
#[cfg_attr(docsrs, doc(cfg(feature = "send")))]
@ -163,7 +164,7 @@ impl Drop for Lua {
unsafe {
if !self.ephemeral {
let extra = &mut *self.extra.get();
for index in extra.prealloc_wrapped_failures.clone() {
for index in extra.wrapped_failures_pool.drain(..) {
ffi::lua_pushnil(extra.ref_thread);
ffi::lua_replace(extra.ref_thread, index);
extra.ref_free.push(index);
@ -453,7 +454,7 @@ impl Lua {
ref_stack_size: ffi::LUA_MINSTACK - 1,
ref_stack_top: 0,
ref_free: Vec::new(),
prealloc_wrapped_failures: Vec::new(),
wrapped_failures_pool: Vec::new(),
hook_callback: None,
}));
@ -2422,18 +2423,16 @@ where
// We cannot shadow Rust errors with Lua ones, so we need to obtain pre-allocated memory
// to store a wrapped error or panic *before* we proceed.
let extra = &mut *get_extra(state);
let prealloc_failure = {
match extra.prealloc_wrapped_failures.pop() {
Some(index) => PreallocatedFailure::Cached(index),
None => {
let ud = ffi::lua_newuserdata(state, mem::size_of::<WrappedFailure>());
ffi::lua_rotate(state, 1, 1);
PreallocatedFailure::New(ud as *mut WrappedFailure)
}
let prealloc_failure = match extra.wrapped_failures_pool.pop() {
Some(index) => PreallocatedFailure::Cached(index),
None => {
let ud = ffi::lua_newuserdata(state, mem::size_of::<WrappedFailure>());
ffi::lua_rotate(state, 1, 1);
PreallocatedFailure::New(ud as *mut WrappedFailure)
}
};
let mut get_prealloc_failure = || match prealloc_failure {
let mut get_wrapped_failure = || match prealloc_failure {
PreallocatedFailure::New(ud) => {
ffi::lua_settop(state, 1);
ud
@ -2453,19 +2452,21 @@ where
Ok(Ok(r)) => {
// Return unused WrappedFailure to the cache
match prealloc_failure {
PreallocatedFailure::New(_) if extra.prealloc_wrapped_failures.len() < 16 => {
PreallocatedFailure::New(_)
if extra.wrapped_failures_pool.len() < WRAPPED_FAILURES_POOL_SIZE =>
{
ffi::lua_rotate(state, 1, -1);
ffi::lua_xmove(state, extra.ref_thread, 1);
let index = ref_stack_pop(extra);
extra.prealloc_wrapped_failures.push(index);
extra.wrapped_failures_pool.push(index);
}
PreallocatedFailure::New(_) => {
ffi::lua_remove(state, 1);
}
PreallocatedFailure::Cached(index)
if extra.prealloc_wrapped_failures.len() < 16 =>
if extra.wrapped_failures_pool.len() < WRAPPED_FAILURES_POOL_SIZE =>
{
extra.prealloc_wrapped_failures.push(index);
extra.wrapped_failures_pool.push(index);
}
PreallocatedFailure::Cached(index) => {
ffi::lua_pushnil(extra.ref_thread);
@ -2476,7 +2477,7 @@ where
r
}
Ok(Err(err)) => {
let wrapped_error = get_prealloc_failure();
let wrapped_error = get_wrapped_failure();
ptr::write(wrapped_error, WrappedFailure::Error(err));
get_gc_metatable::<WrappedFailure>(state);
ffi::lua_setmetatable(state, -2);
@ -2498,7 +2499,7 @@ where
ffi::lua_error(state)
}
Err(p) => {
let wrapped_panic = get_prealloc_failure();
let wrapped_panic = get_wrapped_failure();
ptr::write(wrapped_panic, WrappedFailure::Panic(Some(p)));
get_gc_metatable::<WrappedFailure>(state);
ffi::lua_setmetatable(state, -2);