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fix corner case in collapse_vars (#3527)

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fixes #3526
This commit is contained in:
Alex Lam S.L
2019-10-26 05:41:02 +08:00
committed by GitHub
parent 27b159e711
commit 85237b08d4
2 changed files with 63 additions and 0 deletions
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11
lib/compress.js
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@@ -1228,6 +1228,7 @@ merge(Compressor.prototype, {
var scan_lhs = lhs && !side_effects && !is_lhs_read_only(lhs, compressor);
var scan_rhs = foldable(get_rhs(candidate));
if (!scan_lhs && !scan_rhs) continue;
var modify_toplevel = false;
// Locate symbols which may execute code outside of scanning range
var lvalues = get_lvalues(candidate);
var lhs_local = is_lhs_local(lhs);
@@ -1580,7 +1581,16 @@ merge(Compressor.prototype, {
if (candidate instanceof AST_VarDef) {
lvalues[candidate.name.name] = lhs;
}
var scan_iife = scope instanceof AST_Toplevel;
var tw = new TreeWalker(function(node) {
if (scan_iife && node.TYPE == "Call") {
var exp = node.expression;
if (exp instanceof AST_PropAccess) return;
if (exp instanceof AST_Function && !exp.contains_this()) return;
modify_toplevel = true;
scan_iife = false;
return;
}
var value;
if (node instanceof AST_SymbolRef) {
value = node.fixed_value() || node;
@@ -1667,6 +1677,7 @@ merge(Compressor.prototype, {
var def = sym.definition();
if (def.orig.length == 1 && def.orig[0] instanceof AST_SymbolDefun) return false;
if (def.scope !== scope) return true;
if (modify_toplevel && compressor.exposed(def)) return true;
return !all(def.references, function(ref) {
return ref.scope.resolve() === scope;
});