remove unused AST_Scope.nesting & AST_SymbolRef.frame

they are computed but never used

closes #1444

diff --git a/lib/scope.js b/lib/scope.js
index 55d1eff..0fe8d83 100644 (file)
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -98,25 +98,24 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     var labels = new Dictionary();
     var defun = null;
     var last_var_had_const_pragma = false;
-    var nesting = 0;
     var tw = new TreeWalker(function(node, descend){
         if (options.screw_ie8 && node instanceof AST_Catch) {
             var save_scope = scope;
             scope = new AST_Scope(node);
-            scope.init_scope_vars(nesting);
+            scope.init_scope_vars();
             scope.parent_scope = save_scope;
             descend();
             scope = save_scope;
             return true;
         }
         if (node instanceof AST_Scope) {
-            node.init_scope_vars(nesting);
+            node.init_scope_vars();
             var save_scope = node.parent_scope = scope;
             var save_defun = defun;
             var save_labels = labels;
             defun = scope = node;
             labels = new Dictionary();
-            ++nesting; descend(); --nesting;
+            descend();
             scope = save_scope;
             defun = save_defun;
             labels = save_labels;
@@ -244,7 +243,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     }
 });
 
-AST_Scope.DEFMETHOD("init_scope_vars", function(nesting){
+AST_Scope.DEFMETHOD("init_scope_vars", function(){
     this.variables = new Dictionary(); // map name to AST_SymbolVar (variables defined in this scope; includes functions)
     this.functions = new Dictionary(); // map name to AST_SymbolDefun (functions defined in this scope)
     this.uses_with = false;   // will be set to true if this or some nested scope uses the `with` statement
@@ -252,7 +251,6 @@ AST_Scope.DEFMETHOD("init_scope_vars", function(nesting){
     this.parent_scope = null; // the parent scope
     this.enclosed = [];       // a list of variables from this or outer scope(s) that are referenced from this or inner scopes
     this.cname = -1;          // the current index for mangling functions/variables
-    this.nesting = nesting;   // the nesting level of this scope (0 means toplevel)
 });
 
 AST_Lambda.DEFMETHOD("init_scope_vars", function(){
@@ -278,7 +276,6 @@ AST_SymbolRef.DEFMETHOD("reference", function(options) {
         }
         s = s.parent_scope;
     }
-    this.frame = this.scope.nesting - def.scope.nesting;
 });
 
 AST_Scope.DEFMETHOD("find_variable", function(name){