diff options
Diffstat (limited to 'lib/compress.js')
| -rw-r--r-- | lib/compress.js | 34 |
1 files changed, 21 insertions, 13 deletions
diff --git a/lib/compress.js b/lib/compress.js index 5f2ac2b0..4d768781 100644 --- a/lib/compress.js +++ b/lib/compress.js @@ -3171,16 +3171,16 @@ merge(Compressor.prototype, { && !exp.uses_arguments && !exp.uses_eval && !self.has_pure_annotation(compressor)) { - var body; + var value; if (stat instanceof AST_Return) { - body = stat.value.clone(true); + value = stat.value.clone(true); } else if (stat instanceof AST_SimpleStatement) { - body = []; - merge_sequence(body, stat.body.clone(true)); - merge_sequence(body, make_node(AST_Undefined, self)); - body = make_sequence(self, body); + value = make_node(AST_UnaryPrefix, stat, { + operator: "void", + expression: stat.body.clone(true) + }); } - if (body) { + if (value) { var fn = exp.clone(); fn.argnames = []; fn.body = []; @@ -3200,17 +3200,25 @@ merge(Compressor.prototype, { })); } fn.body.push(make_node(AST_Return, self, { - value: body + value: value })); - body = fn.transform(compressor).body; + var body = fn.transform(compressor).body; if (body.length == 0) return make_node(AST_Undefined, self); if (body.length == 1 && body[0] instanceof AST_Return) { - if (!body[0].value) return make_node(AST_Undefined, self); - body = best_of(compressor, body[0].value, self); + value = body[0].value; + if (!value) return make_node(AST_Undefined, self); + value.walk(new TreeWalker(function(node) { + if (value === self) return true; + if (node instanceof AST_SymbolRef && exp.variables.has(node.name)) { + value = self; + return true; + } + })); + if (value !== self) value = best_of(compressor, value, self); } else { - body = self; + value = self; } - if (body !== self) return body; + if (value !== self) return value; } } if (compressor.option("side_effects") && all(exp.body, is_empty)) { |