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use once_cell::sync::Lazy;
use swc_common::GLOBALS;
use swc_ecma_ast::*;
static CPU_COUNT: Lazy<usize> = Lazy::new(num_cpus::get);
pub fn cpu_count() -> usize {
*CPU_COUNT
}
pub trait Parallel: swc_common::sync::Send + swc_common::sync::Sync {
fn create(&self) -> Self;
fn merge(&mut self, other: Self);
fn after_stmts(&mut self, _stmts: &mut Vec<Stmt>) {}
fn after_module_items(&mut self, _stmts: &mut Vec<ModuleItem>) {}
}
#[cfg(feature = "concurrent")]
#[allow(clippy::len_without_is_empty)]
pub trait Items:
rayon::iter::IntoParallelIterator<Item = Self::Elem> + IntoIterator<Item = Self::Elem>
{
type Elem: Send + Sync;
fn len(&self) -> usize;
}
#[cfg(not(feature = "concurrent"))]
#[allow(clippy::len_without_is_empty)]
pub trait Items: IntoIterator<Item = Self::Elem> {
type Elem: Send + Sync;
fn len(&self) -> usize;
}
impl<T> Items for Vec<T>
where
T: Send + Sync,
{
type Elem = T;
fn len(&self) -> usize {
Vec::len(self)
}
}
impl<'a, T> Items for &'a mut Vec<T>
where
T: Send + Sync,
{
type Elem = &'a mut T;
fn len(&self) -> usize {
Vec::len(self)
}
}
impl<'a, T> Items for &'a mut [T]
where
T: Send + Sync,
{
type Elem = &'a mut T;
fn len(&self) -> usize {
<[T]>::len(self)
}
}
impl<'a, T> Items for &'a [T]
where
T: Send + Sync,
{
type Elem = &'a T;
fn len(&self) -> usize {
<[T]>::len(self)
}
}
pub trait ParallelExt: Parallel {
fn maybe_par<I, F>(&mut self, threshold: usize, nodes: I, op: F)
where
I: Items,
F: Send + Sync + Fn(&mut Self, I::Elem);
}
#[cfg(feature = "concurrent")]
impl<T> ParallelExt for T
where
T: Parallel,
{
fn maybe_par<I, F>(&mut self, threshold: usize, nodes: I, op: F)
where
I: Items,
F: Send + Sync + Fn(&mut Self, I::Elem),
{
if nodes.len() >= threshold || option_env!("SWC_FORCE_CONCURRENT") == Some("1") {
GLOBALS.with(|globals| {
use rayon::prelude::*;
let visitor = nodes
.into_par_iter()
.map(|node| {
GLOBALS.set(globals, || {
let mut visitor = Parallel::create(&*self);
op(&mut visitor, node);
visitor
})
})
.reduce(
|| Parallel::create(&*self),
|mut a, b| {
Parallel::merge(&mut a, b);
a
},
);
Parallel::merge(self, visitor);
});
return;
}
for n in nodes {
op(self, n);
}
}
}
#[cfg(not(feature = "concurrent"))]
impl<T> ParallelExt for T
where
T: Parallel,
{
fn maybe_par<I, F>(&mut self, _threshold: usize, nodes: I, op: F)
where
I: Items,
F: Send + Sync + Fn(&mut Self, I::Elem),
{
for n in nodes {
op(self, n);
}
}
}