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extend unsafe on pure global functions (#2303)

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This commit is contained in:
Alex Lam S.L
2017-09-07 22:08:34 +08:00
committed by GitHub
parent 8b89072190
commit aacf3edc68
2 changed files with 79 additions and 2 deletions
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13
lib/compress.js
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@@ -1990,6 +1990,15 @@ merge(Compressor.prototype, {
return this.pure = pure;
});
var global_pure_fns = makePredicate("Boolean decodeURI decodeURIComponent Date encodeURI encodeURIComponent Error escape EvalError isFinite isNaN Number Object parseFloat parseInt RangeError ReferenceError String SyntaxError TypeError unescape URIError");
AST_Call.DEFMETHOD("is_expr_pure", function(compressor) {
if (compressor.option("unsafe")) {
var expr = this.expression;
if (is_undeclared_ref(expr) && global_pure_fns(expr.name)) return true;
}
return this.has_pure_annotation(compressor) || !compressor.pure_funcs(this);
});
// determine if expression has side effects
(function(def){
def(AST_Node, return_true);
@@ -1999,7 +2008,7 @@ merge(Compressor.prototype, {
def(AST_This, return_false);
def(AST_Call, function(compressor){
if (!this.has_pure_annotation(compressor) && compressor.pure_funcs(this)) return true;
if (!this.is_expr_pure(compressor)) return true;
for (var i = this.args.length; --i >= 0;) {
if (this.args[i].has_side_effects(compressor))
return true;
@@ -2618,7 +2627,7 @@ merge(Compressor.prototype, {
def(AST_Constant, return_null);
def(AST_This, return_null);
def(AST_Call, function(compressor, first_in_statement){
if (!this.has_pure_annotation(compressor) && compressor.pure_funcs(this)) {
if (!this.is_expr_pure(compressor)) {
if (this.expression instanceof AST_Function
&& (!this.expression.name || !this.expression.name.definition().references.length)) {
var node = this.clone();