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perf(es/minifier): Cache the list of bindings for DCE (#5750)

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Donny/강동윤 2022-09-05 16:05:44 +09:00 committed by GitHub
parent e8dd50c12e
commit 8789184d44
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2 changed files with 26 additions and 17 deletions
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20
crates/swc_ecma_minifier/src/compress/mod.rs
View File

@ -386,19 +386,19 @@ where
if self.options.unused {
let _timer = timer!("remove dead code");
let mut visitor = swc_ecma_transforms_optimization::simplify::dce::dce(
swc_ecma_transforms_optimization::simplify::dce::Config {
module_mark: None,
top_level: self.options.top_level(),
top_retain: self.options.top_retain.clone(),
},
self.marks.unresolved_mark,
);
loop {
#[cfg(feature = "debug")]
let start = n.dump();
let mut visitor = swc_ecma_transforms_optimization::simplify::dce::dce(
swc_ecma_transforms_optimization::simplify::dce::Config {
module_mark: None,
top_level: self.options.top_level(),
top_retain: self.options.top_retain.clone(),
},
self.marks.unresolved_mark,
);
n.apply(&mut visitor);
self.changed |= visitor.changed();
@ -417,6 +417,8 @@ where
} else {
break;
}
visitor.reset();
}
}

23
crates/swc_ecma_transforms_optimization/src/simplify/dce/mod.rs
View File

@ -39,10 +39,11 @@ pub fn dce(
config,
changed: false,
pass: 0,
data: Default::default(),
in_block_stmt: false,
in_fn: false,
in_block_stmt: false,
var_decl_kind: None,
data: Default::default(),
bindings: Default::default(),
})
}
@ -86,6 +87,8 @@ struct TreeShaker {
var_decl_kind: Option<VarDeclKind>,
data: Arc<Data>,
bindings: Arc<AHashSet<Id>>,
}
impl CompilerPass for TreeShaker {
@ -96,9 +99,6 @@ impl CompilerPass for TreeShaker {
#[derive(Default)]
struct Data {
/// Bindings in the module.
bindings: AHashSet<Id>,
used_names: AHashMap<Id, VarInfo>,
/// Variable usage graph
@ -535,6 +535,7 @@ impl Parallel for TreeShaker {
expr_ctx: self.expr_ctx.clone(),
data: self.data.clone(),
config: self.config.clone(),
bindings: self.bindings.clone(),
..*self
}
}
@ -606,7 +607,7 @@ impl TreeShaker {
return false;
}
self.data.bindings.contains(&name)
self.bindings.contains(&name)
&& self
.data
.used_names
@ -795,8 +796,11 @@ impl VisitMut for TreeShaker {
fn visit_mut_module(&mut self, m: &mut Module) {
let _tracing = span!(Level::ERROR, "tree-shaker", pass = self.pass).entered();
if self.bindings.is_empty() {
self.bindings = Arc::new(collect_decls(&*m))
}
let mut data = Data {
bindings: collect_decls(&*m),
..Default::default()
};
@ -822,8 +826,11 @@ impl VisitMut for TreeShaker {
fn visit_mut_script(&mut self, m: &mut Script) {
let _tracing = span!(Level::ERROR, "tree-shaker", pass = self.pass).entered();
if self.bindings.is_empty() {
self.bindings = Arc::new(collect_decls(&*m))
}
let mut data = Data {
bindings: collect_decls(&*m),
..Default::default()
};