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better fix for #2858 (#2864)

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This commit is contained in:
Alex Lam S.L
2018-02-01 20:06:36 +08:00
committed by GitHub
parent c3a002ff97
commit 525a61fb55
1 changed files with 11 additions and 13 deletions
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24
lib/compress.js
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@@ -990,7 +990,6 @@ merge(Compressor.prototype, {
|| node instanceof AST_Debugger
|| node instanceof AST_IterationStatement && !(node instanceof AST_For)
|| node instanceof AST_Try
|| node instanceof AST_VarDef && node.value && side_effects && !references_in_scope(node.name.definition())
|| node instanceof AST_With
|| parent instanceof AST_For && node !== parent.init
|| (side_effects || !replace_all)
@@ -1048,9 +1047,11 @@ merge(Compressor.prototype, {
|| node instanceof AST_PropAccess
&& (side_effects || node.expression.may_throw_on_access(compressor))
|| node instanceof AST_SymbolRef
&& (lvalues[node.name]
|| side_effects && !references_in_scope(node.definition()))
|| (sym = lhs_or_def(node))
&& !(parent instanceof AST_Assign && parent.operator == "=" && parent.left === node)
&& (lvalues[node.name] || may_modify(node))
|| node instanceof AST_VarDef && node.value
&& (node.name.name in lvalues || may_modify(node.name))
|| (sym = is_lhs(node.left, node))
&& (sym instanceof AST_PropAccess || sym.name in lvalues)
|| may_throw
&& (in_try ? node.has_side_effects(compressor) : side_effects_external(node))
@@ -1321,11 +1322,6 @@ merge(Compressor.prototype, {
return lvalues;
}
function lhs_or_def(node) {
if (node instanceof AST_VarDef) return node.value && node.name;
return is_lhs(node.left, node);
}
function remove_candidate(expr) {
if (expr.name instanceof AST_SymbolFunarg) {
var index = compressor.self().argnames.indexOf(expr.name);
@@ -1359,10 +1355,12 @@ merge(Compressor.prototype, {
return get_rvalue(expr).has_side_effects(compressor);
}
function references_in_scope(def) {
if (def.orig.length == 1 && def.orig[0] instanceof AST_SymbolDefun) return true;
if (def.scope !== scope) return false;
return def.references.every(function(ref) {
function may_modify(sym) {
if (!side_effects) return false;
var def = sym.definition();
if (def.orig.length == 1 && def.orig[0] instanceof AST_SymbolDefun) return false;
if (def.scope !== scope) return true;
return !all(def.references, function(ref) {
return ref.scope === scope;
});
}