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improve Dictionary performance (#5202)

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- workaround `__proto__` quirks on v8
This commit is contained in:
Alex Lam S.L
2021-12-05 06:58:52 +00:00
committed by GitHub
parent 860aa9531b
commit b0799105c2
8 changed files with 255 additions and 221 deletions
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31
lib/scope.js
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@@ -510,12 +510,12 @@ function names_in_use(scope, options) {
if (!names) {
scope.cname = -1;
scope.cname_holes = [];
scope.names_in_use = names = Object.create(null);
scope.names_in_use = names = new Dictionary();
var cache = options.cache && options.cache.props;
scope.enclosed.forEach(function(def) {
if (def.unmangleable(options)) names[def.name] = true;
if (def.unmangleable(options)) names.set(def.name, true);
if (def.global && cache && cache.has(def.name)) {
names[cache.get(def.name)] = true;
names.set(cache.get(def.name), true);
}
});
}
@@ -526,34 +526,33 @@ function next_mangled_name(def, options) {
var scope = def.scope;
var in_use = names_in_use(scope, options);
var holes = scope.cname_holes;
var names = Object.create(null);
var names = new Dictionary();
var scopes = [ scope ];
def.forEach(function(sym) {
var scope = sym.scope;
do {
if (scopes.indexOf(scope) < 0) {
for (var name in names_in_use(scope, options)) {
names[name] = true;
}
scopes.push(scope);
} else break;
if (member(scope, scopes)) break;
names_in_use(scope, options).each(function(marker, name) {
names.set(name, marker);
});
scopes.push(scope);
} while (scope = scope.parent_scope);
});
var name;
for (var i = 0; i < holes.length; i++) {
name = base54(holes[i]);
if (names[name]) continue;
if (names.has(name)) continue;
holes.splice(i, 1);
in_use[name] = true;
in_use.set(name, true);
return name;
}
while (true) {
name = base54(++scope.cname);
if (in_use[name] || RESERVED_WORDS[name] || options.reserved.has[name]) continue;
if (!names[name]) break;
if (in_use.has(name) || RESERVED_WORDS[name] || options.reserved.has[name]) continue;
if (!names.has(name)) break;
holes.push(scope.cname);
}
in_use[name] = true;
in_use.set(name, true);
return name;
}
@@ -598,7 +597,7 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
if (options.cache && options.cache.props) {
var mangled_names = names_in_use(this, options);
options.cache.props.each(function(mangled_name) {
mangled_names[mangled_name] = true;
mangled_names.set(mangled_name, true);
});
}