Heap profiler: add an ability to iterate over snapshot's nodes.

test/cctest/test-heap-profiler.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 //
 // Tests for heap profiler
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 
 #include "v8.h"
 
 #include "cctest.h"
 #include "heap-profiler.h"
@@ skipping 1354 matching lines @@
       "document = { URL: new URLWithException() };");
   const v8::HeapSnapshot* snapshot =
       v8::HeapProfiler::TakeSnapshot(v8::String::New("document"));
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK_NE(NULL, global);
   CHECK_EQ("Object",
            const_cast<i::HeapEntry*>(
                reinterpret_cast<const i::HeapEntry*>(global))->name());
 }
 
+
+TEST(NodesIteration) {
+  v8::HandleScope scope;
+  LocalContext env;
+  const v8::HeapSnapshot* snapshot =
+      v8::HeapProfiler::TakeSnapshot(v8::String::New("iteration"));
+  const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
+  CHECK_NE(NULL, global);
+  // Verify that we can find this object by iteration.
+  const int nodes_count = snapshot->GetNodesCount();
+  int count = 0;
+  for (int i = 0; i < nodes_count; ++i) {
+    if (snapshot->GetNode(i) == global)
+      ++count;
+  }
+  CHECK_EQ(1, count);
+}
+
 #endif  // ENABLE_LOGGING_AND_PROFILING