AST_Node.DEFMETHOD("reset_opt_flags", function(compressor, rescan) {
var reduce_vars = rescan && compressor.option("reduce_vars");
+ // Stack of look-up tables to keep track of whether a `SymbolDef` has been
+ // properly assigned before use:
+ // - `push()` & `pop()` when visiting conditional branches
+ // - backup & restore via `save_ids` when visiting out-of-order sections
var safe_ids = Object.create(null);
var suppressor = new TreeWalker(function(node) {
if (!(node instanceof AST_Symbol)) return;
return true;
}
if (node instanceof AST_Accessor) {
- var save_ids = safe_ids;
- safe_ids = Object.create(null);
+ push();
descend();
- safe_ids = save_ids;
+ pop();
return true;
}
if (node instanceof AST_Binary