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enhance mangle (#5262)

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This commit is contained in:
Alex Lam S.L
2022-01-04 02:06:00 +00:00
committed by GitHub
parent c94624f36c
commit 2f568b9357
1 changed files with 27 additions and 13 deletions
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40
lib/scope.js
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@@ -586,32 +586,30 @@ function _default_mangler_options(options) {
webkit : false,
});
if (!Array.isArray(options.reserved)) options.reserved = [];
// Never mangle arguments
// Never mangle `arguments`
push_uniq(options.reserved, "arguments");
options.reserved.has = makePredicate(options.reserved);
return options;
}
// We only need to mangle declaration nodes. Special logic wired into the code
// generator will display the mangled name if it is present (and for
// `AST_SymbolRef`s it will use the mangled name of the `AST_SymbolDeclaration`
// that it points to).
AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
options = _default_mangler_options(options);
// We only need to mangle declaration nodes. Special logic wired
// into the code generator will display the mangled name if it's
// present (and for AST_SymbolRef-s it'll use the mangled name of
// the AST_SymbolDeclaration that it points to).
var lname = -1;
if (options.cache && options.cache.props) {
var mangled_names = names_in_use(this, options);
options.cache.props.each(function(mangled_name) {
mangled_names.set(mangled_name, true);
});
}
var cutoff = 10;
var lname = -1;
var redefined = [];
var tw = new TreeWalker(function(node, descend) {
if (node instanceof AST_LabeledStatement) {
// lname is incremented when we get to the AST_Label
// `lname` is incremented when we get to the `AST_Label`
var save_nesting = lname;
descend();
if (!options.v8 || !in_label(tw)) lname = save_nesting;
@@ -633,9 +631,9 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
});
}, true);
}
node.to_mangle = [];
var to_mangle = node.to_mangle = [];
node.variables.each(function(def) {
if (!defer_redef(def)) node.to_mangle.push(def);
if (!defer_redef(def)) to_mangle.push(def);
});
descend();
if (options.cache && node instanceof AST_Toplevel) {
@@ -646,7 +644,23 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
sym.scope = node;
sym.reference(options);
}
node.to_mangle.forEach(mangle);
if (to_mangle.length > cutoff) {
var indices = to_mangle.map(function(def, index) {
return index;
}).sort(function(i, j) {
return to_mangle[j].references.length - to_mangle[i].references.length || i - j;
});
to_mangle = indices.slice(0, cutoff).sort(function(i, j) {
return i - j;
}).map(function(index) {
return to_mangle[index];
}).concat(indices.slice(cutoff).sort(function(i, j) {
return i - j;
}).map(function(index) {
return to_mangle[index];
}));
}
to_mangle.forEach(mangle);
return true;
}
if (node instanceof AST_Label) {