[TypeFeedbackVector] Root feedback vectors at function literal site.

test/cctest/test-heap-profiler.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2234 matching lines @@
       "fun = function () { var a = [3, 2, 1]; return a; }\n"
       "fun();");
   const v8::HeapSnapshot* snapshot = heap_profiler->TakeHeapSnapshot();
   CHECK(ValidateSnapshot(snapshot));
 
   const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
   CHECK(global);
   const v8::HeapGraphNode* fun_code =
       GetProperty(global, v8::HeapGraphEdge::kProperty, "fun");
   CHECK(fun_code);
-  const v8::HeapGraphNode* literals =
-      GetProperty(fun_code, v8::HeapGraphEdge::kInternal, "literals");
-  CHECK(literals);
-  CHECK_EQ(v8::HeapGraphNode::kArray, literals->GetType());
-  CHECK_EQ(1, literals->GetChildrenCount());
+  const v8::HeapGraphNode* vector_cell = GetProperty(
+      fun_code, v8::HeapGraphEdge::kInternal, "feedback_vector_cell");
+  // TODO(mvstanton): I'm not sure if this is the best way to expose
+  // literals. Is it too much to expose the Cell?
+  CHECK(vector_cell);
+  const v8::HeapGraphNode* vector =
+      GetProperty(vector_cell, v8::HeapGraphEdge::kInternal, "value");
+  CHECK_EQ(v8::HeapGraphNode::kArray, vector->GetType());
+  CHECK_EQ(3, vector->GetChildrenCount());
 
-  // The first value in the literals array should be the boilerplate,
+  // The first value in the feedback vector should be the boilerplate,
   // after an AllocationSite.
-  const v8::HeapGraphEdge* prop = literals->GetChild(0);
+  const v8::HeapGraphEdge* prop = vector->GetChild(2);
   const v8::HeapGraphNode* allocation_site = prop->GetToNode();
   v8::String::Utf8Value name(allocation_site->GetName());
   CHECK_EQ(0, strcmp("system / AllocationSite", *name));
   const v8::HeapGraphNode* transition_info =
       GetProperty(allocation_site, v8::HeapGraphEdge::kInternal,
                   "transition_info");
   CHECK(transition_info);
 
   const v8::HeapGraphNode* elements =
       GetProperty(transition_info, v8::HeapGraphEdge::kInternal,
@@ skipping 746 matching lines @@
       "      a[i] = i;\n"
       "  for (var i = 0; i < 3; ++i)\n"
       "      a.shift();\n"
       "}\n");
 
   CcTest::CollectGarbage(v8::internal::NEW_SPACE);
   // Should not crash.
 
   heap_profiler->StopSamplingHeapProfiler();
 }