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fix corner cases with arguments (#4520)

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fixes #4519
This commit is contained in:
Alex Lam S.L
2021-01-07 08:53:14 +00:00
committed by GitHub
parent cf1b0165af
commit 25321df959
2 changed files with 76 additions and 20 deletions
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36
lib/scope.js
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@@ -234,19 +234,24 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
if (node.label) node.label.thedef.references.push(node);
return true;
}
// ensure mangling works if `catch` reuses a scope variable
if (node instanceof AST_SymbolCatch) {
var def = node.definition().redefined();
if (def) for (var s = node.scope; s; s = s.parent_scope) {
push_uniq(s.enclosed, def);
if (s === def.scope) break;
if (node instanceof AST_SymbolDeclaration) {
if (node instanceof AST_SymbolCatch) {
// ensure mangling works if `catch` reuses a scope variable
var def = node.definition().redefined();
if (def) for (var s = node.scope; s; s = s.parent_scope) {
push_uniq(s.enclosed, def);
if (s === def.scope) break;
}
} else if (node instanceof AST_SymbolConst) {
// ensure compression works if `const` reuses a scope variable
var redef = node.definition().redefined();
if (redef) redef.const_redefs = true;
}
return true;
}
// ensure compression works if `const` reuses a scope variable
if (node instanceof AST_SymbolConst) {
var redef = node.definition().redefined();
if (redef) redef.const_redefs = true;
if (node.name != "arguments") return true;
var parent = node instanceof AST_SymbolVar && tw.parent();
if (parent instanceof AST_VarDef && !parent.value) return true;
var sym = node.scope.resolve().find_variable("arguments");
if (sym && is_arguments(sym)) sym.scope.uses_arguments = 3;
return true;
}
if (node instanceof AST_SymbolRef) {
@@ -295,13 +300,6 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
node.reference(options);
return true;
}
if (node instanceof AST_VarDef) {
if (node.value && node.name.name == "arguments") {
var sym = node.name.scope.resolve().find_variable("arguments");
if (sym && is_arguments(sym)) sym.scope.uses_arguments = 3;
}
return;
}
});
self.walk(tw);