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perf(minifier): avoid repeated Atom creation in InjectGlobalVariables (#4802)

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Re-use `Atom`s in `InjectGlobalVariables` minifier plugin.

Instead of allocating a new `Atom` on every replacement, create `Atom` lazily when making first replacement, and cache it.

As discussed in: https://github.com/oxc-project/oxc/pull/4759#discussion_r1711669464
This commit is contained in:
overlookmotel 2024-08-10 13:46:13 +00:00
parent 62f759c1f2
commit 35f27420b9
1 changed files with 21 additions and 7 deletions
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28
crates/oxc_minifier/src/plugins/inject_global_variables.rs
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@ -83,11 +83,20 @@ impl InjectImportSpecifier {
}
}
impl From<&InjectImport> for DotDefine {
/// Wrapper around `DotDefine` which caches the `Atom` to replace with.
/// `value_atom` is populated lazily when first replacement happens.
/// If no replacement is made, `value_atom` remains `None`.
struct DotDefineState<'a> {
dot_define: DotDefine,
value_atom: Option<Atom<'a>>,
}
impl<'a> From<&InjectImport> for DotDefineState<'a> {
fn from(inject: &InjectImport) -> Self {
let parts = inject.specifier.local().split('.').map(CompactStr::from).collect::<Vec<_>>();
let value = inject.replace_value.clone().unwrap();
Self { parts, value }
let dot_define = DotDefine { parts, value };
Self { dot_define, value_atom: None }
}
}
@ -102,7 +111,7 @@ pub struct InjectGlobalVariables<'a> {
// states
/// Dot defines derived from the config.
dot_defines: Vec<DotDefine>,
dot_defines: Vec<DotDefineState<'a>>,
/// Identifiers for which dot define replaced a member expression.
replaced_dot_defines:
@ -138,7 +147,7 @@ impl<'a> InjectGlobalVariables<'a> {
.injects
.iter()
.filter(|i| i.replace_value.is_some())
.map(DotDefine::from)
.map(DotDefineState::from)
.collect::<Vec<_>>();
if !dot_defines.is_empty() {
@ -211,10 +220,15 @@ impl<'a> InjectGlobalVariables<'a> {
fn replace_dot_defines(&mut self, expr: &mut Expression<'a>) {
if let Expression::StaticMemberExpression(member) = expr {
for dot_define in &self.dot_defines {
for DotDefineState { dot_define, value_atom } in &mut self.dot_defines {
if ReplaceGlobalDefines::is_dot_define(dot_define, member) {
let value =
self.ast.expression_identifier_reference(SPAN, dot_define.value.as_str());
// Create `Atom` for replacement lazily on first replacement
if value_atom.is_none() {
*value_atom = Some(self.ast.atom(dot_define.value.as_str()));
}
let value_atom = value_atom.as_ref().unwrap().clone();
let value = self.ast.expression_identifier_reference(SPAN, value_atom);
*expr = value;
self.replaced_dot_defines
.push((dot_define.parts[0].clone(), dot_define.value.clone()));