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enhance collapse_vars around lazy operations (#2369)

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Alex Lam S.L
2017-10-19 04:52:00 +08:00
committed by GitHub
parent 7e5b5cac97
commit 0f2ef3367c
2 changed files with 71 additions and 5 deletions
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11
lib/compress.js
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@@ -778,6 +778,7 @@ merge(Compressor.prototype, {
// Locate symbols which may execute code outside of scanning range
var lvalues = get_lvalues(candidate);
if (lhs instanceof AST_SymbolRef) lvalues[lhs.name] = false;
var one_off = lhs instanceof AST_Symbol && lhs.definition().references.length == 1;
var side_effects = value_has_side_effects(candidate);
var hit = candidate.name instanceof AST_SymbolFunarg;
var abort = false, replaced = false;
@@ -844,11 +845,11 @@ merge(Compressor.prototype, {
|| side_effects && !references_in_scope(node.definition()))
|| (sym = lhs_or_def(node))
&& (sym instanceof AST_PropAccess || sym.name in lvalues)
|| parent instanceof AST_Binary && lazy_op(parent.operator)
|| parent instanceof AST_Case
|| parent instanceof AST_Conditional
|| parent instanceof AST_For
|| parent instanceof AST_If) {
|| (side_effects || !one_off)
&& (parent instanceof AST_Binary && lazy_op(parent.operator)
|| parent instanceof AST_Case
|| parent instanceof AST_Conditional
|| parent instanceof AST_If)) {
if (!(node instanceof AST_Scope)) descend(node, tt);
abort = true;
return node;