Compute assigned variables and dominance frontiers.

runtime/vm/scopes.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_SCOPES_H_
 #define VM_SCOPES_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/growable_array.h"
@@ skipping 40 matching lines @@
   void set_is_captured() { is_captured_ = true; }
 
   bool HasIndex() const {
     return index_ != kUnitializedIndex;
   }
   int index() const {
     ASSERT(HasIndex());
     return index_;
   }
 
-  // Assign an index to a local.  This function can be called more than once
-  // on the same on local (e.g., if we tried to compile in one mode, bailed
-  // out, and fell back to a different compilation mode).  In any case, it
-  // should not change the index once set.
+  // Assign an index to a local.
   void set_index(int index) {
     ASSERT(!HasIndex());
     ASSERT(index != kUnitializedIndex);
     index_ = index;
   }
 
   void set_invisible(bool value) {
     is_invisible_ = value;
   }
 
@@ skipping 252 matching lines @@
   intptr_t end_token_index_;  // Token index of end of scope.
   GrowableArray<LocalVariable*> variables_;
   GrowableArray<SourceLabel*> labels_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_SCOPES_H_