Incoming references service request and UI.

runtime/vm/object_graph.h

 // Copyright (c) 2014, 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_OBJECT_GRAPH_H_
 #define VM_OBJECT_GRAPH_H_
 
 #include "vm/allocation.h"
 #include "vm/object.h"
 
@@ skipping 63 matching lines @@
   // provided array with pairs of (object, offset from parent in words),
   // starting with 'obj' itself, as far as there is room. Returns the number
   // of objects on the full path. A null input array behaves like a zero-length
   // input array. The 'offset' of a root is -1.
   //
   // To break the trivial path, the handle 'obj' is temporarily cleared during
   // the search, but restored before returning. If no path is found (i.e., the
   // provided handle was the only way to reach the object), zero is returned.
   intptr_t RetainingPath(Object* obj, const Array& path);
 
+  // Find the objects that reference 'obj'. Populates the provided array with
+  // pairs of (object pointing to 'obj', offset of pointer in words), as far as
+  // there is room. Returns the number of objects found.
+  //
+  // An object for which this function answers no inbound references might still
+  // be live due to references from the stack or embedder handles.
+  intptr_t InboundReferences(Object* obj, const Array& references);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(ObjectGraph);
 };
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_GRAPH_H_