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Merge branch 'master' into harmony-v3.0.4

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This commit is contained in:
alexlamsl
2017-05-12 05:13:11 +08:00
parent fcd90db30d daaefc17b9
commit daf44f2b21
6 changed files with 154 additions and 44 deletions
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14
lib/compress.js
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@@ -532,6 +532,14 @@ merge(Compressor.prototype, {
return lhs instanceof AST_SymbolRef && lhs.definition().orig[0] instanceof AST_SymbolLambda;
}
function is_reference_const(ref) {
if (!(ref instanceof AST_SymbolRef)) return false;
var orig = ref.definition().orig;
for (var i = orig.length; --i >= 0;) {
if (orig[i] instanceof AST_SymbolConst) return true;
}
}
function find_variable(compressor, name) {
var scope, i = 0;
while (scope = compressor.parent(i++)) {
@@ -806,7 +814,8 @@ merge(Compressor.prototype, {
return make_node(AST_SymbolRef, expr.name, expr.name);
}
} else {
return expr[expr instanceof AST_Assign ? "left" : "expression"];
var lhs = expr[expr instanceof AST_Assign ? "left" : "expression"];
return !is_reference_const(lhs) && lhs;
}
}
@@ -2029,6 +2038,7 @@ merge(Compressor.prototype, {
&& node instanceof AST_Assign
&& node.operator == "="
&& node.left instanceof AST_SymbolRef
&& !is_reference_const(node.left)
&& scope === self) {
node.right.walk(tw);
return true;
@@ -3314,7 +3324,7 @@ merge(Compressor.prototype, {
&& (left.operator == "++" || left.operator == "--")) {
left = left.expression;
} else left = null;
if (!left || is_lhs_read_only(left)) {
if (!left || is_lhs_read_only(left) || is_reference_const(left)) {
expressions[++i] = cdr;
continue;
}