[WIP] for-of iterator finalization

src/ast/ast.h

Index: src/ast/ast.h
diff --git a/src/ast/ast.h b/src/ast/ast.h
index 0174a13478c458671a60bb0b0041e9c00acddf60..21cafcce3e2daa9e80cd3afbacb8bf3e7a60f1fd 100644
--- a/src/ast/ast.h
+++ b/src/ast/ast.h
@@ -883,11 +883,13 @@ class ForOfStatement final : public ForEachStatement {
   void Initialize(Expression* each,
                   Expression* subject,
                   Statement* body,
+                  Variable* iterator,
                   Expression* assign_iterator,
                   Expression* next_result,
                   Expression* result_done,
                   Expression* assign_each) {
     ForEachStatement::Initialize(each, subject, body);
+    iterator_ = iterator;
     assign_iterator_ = assign_iterator;
     next_result_ = next_result;
     result_done_ = result_done;
@@ -898,6 +900,10 @@ class ForOfStatement final : public ForEachStatement {
     return subject();
   }
 
+  Variable* iterator() const {
+    return iterator_;
+  }
+

[neis, 2016/02/12 12:30:13]

Instead of having iterator_, we could extract the variable from assign_iterator
or next_result.

   // iterator = subject[Symbol.iterator]()
   Expression* assign_iterator() const {
     return assign_iterator_;
@@ -932,6 +938,7 @@ class ForOfStatement final : public ForEachStatement {
  protected:
   ForOfStatement(Zone* zone, ZoneList<const AstRawString*>* labels, int pos)
       : ForEachStatement(zone, labels, pos),
+        iterator_(NULL),
         assign_iterator_(NULL),
         next_result_(NULL),
         result_done_(NULL),
@@ -941,6 +948,7 @@ class ForOfStatement final : public ForEachStatement {
  private:
   int local_id(int n) const { return base_id() + parent_num_ids() + n; }
 
+  Variable* iterator_;
   Expression* assign_iterator_;
   Expression* next_result_;
   Expression* result_done_;