Eliminate internal and hidden links to oddballs and other non-essential objects in heap snapshot.

test/cctest/test-heap-profiler.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 //
 // Tests for heap profiler
 
 #include <ctype.h>
 
 #include "v8.h"
 
 #include "cctest.h"
 #include "heap-profiler.h"
@@ skipping 1627 matching lines @@
   const v8::HeapGraphNode* strong_roots = GetNode(
       gc_roots, v8::HeapGraphNode::kObject, "(Strong roots)");
   CHECK_NE(NULL, strong_roots);
   for (int i = 0; i < strong_roots->GetChildrenCount(); ++i) {
     const v8::HeapGraphEdge* edge = strong_roots->GetChild(i);
     CHECK_EQ(v8::HeapGraphEdge::kInternal, edge->GetType());
     v8::String::AsciiValue name(edge->GetName());
     CHECK(isalpha(**name));
   }
 }
+
+
+TEST(NoRefsToNonEssentialEntries) {
+  v8::HandleScope scope;
+  LocalContext env;
+  CompileRun("global_object = {};\n");
+  const v8::HeapSnapshot* snapshot =
+      v8::HeapProfiler::TakeSnapshot(v8_str("snapshot"));
+  const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
+  const v8::HeapGraphNode* global_object =
+      GetProperty(global, v8::HeapGraphEdge::kProperty, "global_object");
+  CHECK_NE(NULL, global_object);
+  const v8::HeapGraphNode* properties =
+      GetProperty(global_object, v8::HeapGraphEdge::kInternal, "properties");
+  CHECK_EQ(NULL, properties);
+  const v8::HeapGraphNode* elements =
+      GetProperty(global_object, v8::HeapGraphEdge::kInternal, "elements");
+  CHECK_EQ(NULL, elements);
+}