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enhance collapse_vars (#4864)

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This commit is contained in:
Alex Lam S.L
2021-04-24 05:45:18 +01:00
committed by GitHub
parent 9b8deff64d
commit 10dd9d4eaf
2 changed files with 74 additions and 2 deletions
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15
lib/compress.js
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@@ -1856,6 +1856,7 @@ merge(Compressor.prototype, {
case 0:
hit = true;
if (assign_used) return node;
if (node !== candidate) return node;
if (node instanceof AST_VarDef) return node;
def.replaced++;
var parent = multi_replacer.parent();
@@ -1957,7 +1958,9 @@ merge(Compressor.prototype, {
for (var i = stat_index; !abort && i < statements.length; i++) {
if (!statements[i].transform(multi_replacer)) statements.splice(i--, 1);
}
if (candidate instanceof AST_VarDef) {
if (candidate !== hit_stack[hit_stack.length - 1]) {
replaced = false;
} else if (candidate instanceof AST_VarDef) {
replaced = !compressor.exposed(def) && def.references.length == def.replaced;
}
value_def.single_use = false;
@@ -2546,15 +2549,23 @@ merge(Compressor.prototype, {
}
}
function mangleable_var(value) {
function mangleable_var(rhs) {
if (force_single) {
force_single = false;
return;
}
var value = rhs instanceof AST_Assign && rhs.operator == "=" ? rhs.left : rhs;
if (!(value instanceof AST_SymbolRef)) return;
var def = value.definition();
if (def.undeclared) return;
if (is_arguments(def)) return;
if (value !== rhs) {
if (value.is_immutable()) return;
var referenced = def.references.length - def.replaced;
if (referenced < 2) return;
candidate = candidate.clone();
candidate[candidate instanceof AST_Assign ? "right" : "value"] = value;
}
return value_def = def;
}