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fix corner case in reduce_vars (#5056)

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fixes #5055
This commit is contained in:
Alex Lam S.L
2021-07-06 19:23:09 +01:00
committed by GitHub
parent 0668fad5e9
commit 1fefe3f1d1
2 changed files with 65 additions and 12 deletions
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31
lib/compress.js
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@@ -526,26 +526,33 @@ merge(Compressor.prototype, {
tw.fn_scanning = was_scanning;
}
function revisit_fn_def(tw, fn) {
fn.enclosed.forEach(function(d) {
if (fn.variables.get(d.name) === d) return;
if (safe_to_read(tw, d)) return;
d.single_use = false;
var fixed = d.fixed;
if (typeof fixed == "function") fixed = fixed();
if (fixed instanceof AST_Lambda && HOP(fixed, "safe_ids")) return;
d.fixed = false;
});
}
function mark_fn_def(tw, def, fn) {
if (!HOP(fn, "safe_ids")) return;
var marker = fn.safe_ids;
if (marker === false) return;
if (fn.parent_scope.resolve().may_call_this === return_true) return;
if (marker) {
if (fn.parent_scope.resolve().may_call_this === return_true) {
if (member(fn, tw.fn_visited)) revisit_fn_def(tw, fn);
} else if (marker) {
var visited = member(fn, tw.fn_visited);
if (marker === tw.safe_ids) {
if (!visited) walk_fn_def(tw, fn);
} else if (!visited) {
} else if (visited) {
revisit_fn_def(tw, fn);
} else {
fn.safe_ids = false;
} else fn.enclosed.forEach(function(d) {
if (fn.variables.get(d.name) === d) return;
if (safe_to_read(tw, d)) return;
d.single_use = false;
var fixed = d.fixed;
if (typeof fixed == "function") fixed = fixed();
if (fixed instanceof AST_Lambda && HOP(fixed, "safe_ids")) return;
d.fixed = false;
});
}
} else if (tw.fn_scanning && tw.fn_scanning !== def.scope.resolve()) {
fn.safe_ids = false;
} else {