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improve exceptional flow compression by collapse_vars (#2880)

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This commit is contained in:
Alex Lam S.L
2018-02-04 04:18:22 +08:00
committed by GitHub
parent 78a44d5ab0
commit 3026bd8975
2 changed files with 9 additions and 22 deletions
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13
lib/compress.js
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@@ -1408,22 +1408,15 @@ merge(Compressor.prototype, {
}
function side_effects_external(node, lhs) {
if (node instanceof AST_Assign) {
return side_effects_external(node.left, true)
|| side_effects_external(node.right);
}
if (node instanceof AST_Definitions) return false;
if (node instanceof AST_Assign) return side_effects_external(node.left, true);
if (node instanceof AST_Unary) return side_effects_external(node.expression, true);
if (node instanceof AST_VarDef) return node.value && side_effects_external(node.value);
if (lhs) {
if (node instanceof AST_Dot) return side_effects_external(node.expression, true);
if (node instanceof AST_Sub) {
return side_effects_external(node.expression, true)
|| side_effects_external(node.property);
}
if (node instanceof AST_Sub) return side_effects_external(node.expression, true);
if (node instanceof AST_SymbolRef) return node.definition().scope !== scope;
}
return node.has_side_effects(compressor);
return false;
}
}