swc-project/swc
1
1
Fork 0
mirror of https://github.com/swc-project/swc.git synced 2024-10-05 12:49:21 +03:00
Code Issues Actions 4 Packages Projects Releases Wiki Activity

perf(es/minifier): Optimize precompress optimizer (#5727)

Browse Source
This commit is contained in:
Donny/강동윤 2022-09-03 15:43:50 +09:00 committed by GitHub
parent 5f09a1c14a
commit 31c516a922
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 22 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
crates/swc_ecma_minifier/src/pass/precompress.rs
View File

@ -1,12 +1,15 @@
use swc_atoms::js_word;
use swc_common::util::take::Take;
use swc_ecma_ast::*;
use swc_ecma_transforms_base::{
helpers::{Helpers, HELPERS},
perf::Parallel,
};
use swc_ecma_visit::{noop_visit_mut_type, VisitMut, VisitMutWith, VisitWith};
use crate::{
analyzer::{analyze, ModuleInfo, ProgramData, UsageAnalyzer},
analyzer::{ModuleInfo, UsageAnalyzer},
marks::Marks,
maybe_par,
option::CompressOptions,
util::ModuleItemExt,
};
@ -23,7 +26,6 @@ pub(crate) fn precompress_optimizer<'a>(
options,
module_info,
marks,
data: Default::default(),
ctx: Default::default(),
}
}
@ -35,10 +37,17 @@ pub(crate) struct PrecompressOptimizer<'a> {
marks: Marks,
data: Option<ProgramData>,
ctx: Ctx,
}
impl Parallel for PrecompressOptimizer<'_> {
fn create(&self) -> Self {
Self { ..*self }
}
fn merge(&mut self, _: Self) {}
}
#[derive(Debug, Default, Clone, Copy)]
struct Ctx {
in_var_pat: bool,
@ -50,41 +59,12 @@ impl PrecompressOptimizer<'_> {
T: for<'aa> VisitMutWith<PrecompressOptimizer<'aa>> + ModuleItemExt,
Vec<T>: for<'aa> VisitMutWith<PrecompressOptimizer<'aa>> + VisitWith<UsageAnalyzer>,
{
if self.data.is_some() {
stmts.visit_mut_children_with(self);
return;
}
if self.data.is_none() {
let has_decl = maybe_par!(
stmts
.iter()
.any(|stmt| matches!(stmt.as_module_decl(), Ok(..) | Err(Stmt::Decl(..)))),
*crate::LIGHT_TASK_PARALLELS
);
if has_decl {
let data = Some(analyze(&*stmts, self.module_info, Some(self.marks)));
stmts.visit_mut_children_with(&mut PrecompressOptimizer {
options: self.options,
module_info: self.module_info,
marks: self.marks,
data,
ctx: self.ctx,
});
return;
}
stmts.iter_mut().for_each(|stmt| {
stmt.visit_mut_with(&mut PrecompressOptimizer {
options: self.options,
module_info: self.module_info,
marks: self.marks,
data: None,
ctx: self.ctx,
})
});
}
stmts.visit_mut_children_with(&mut PrecompressOptimizer {
options: self.options,
module_info: self.module_info,
marks: self.marks,
ctx: self.ctx,
});
}
}
@ -124,7 +104,9 @@ impl VisitMut for PrecompressOptimizer<'_> {
}
fn visit_mut_module_items(&mut self, n: &mut Vec<ModuleItem>) {
self.handle_stmts(n);
HELPERS.set(&Helpers::new(true), || {
self.handle_stmts(n);
});
n.retain(|s| !matches!(s, ModuleItem::Stmt(Stmt::Empty(..))));
}