- Added fast case for extending the JSObject properties storage....

src/handles.cc

Index: src/handles.cc
===================================================================
--- src/handles.cc	(revision 415)
+++ src/handles.cc	(working copy)
@@ -86,21 +86,26 @@
 }
 
 
-void SetExpectedNofPropertiesFromEstimate(Handle<SharedFunctionInfo> shared,
-                                          int estimate) {
+static int ExpectedNofPropertiesFromEstimate(int estimate) {
   // TODO(1231235): We need dynamic feedback to estimate the number
   // of expected properties in an object. The static hack below
   // is barely a solution.
-  shared->set_expected_nof_properties(estimate + 2);
+  if (estimate == 0) return 4;
+  return estimate + 2;
 }
 
 
+void SetExpectedNofPropertiesFromEstimate(Handle<SharedFunctionInfo> shared,
+                                          int estimate) {
+  shared->set_expected_nof_properties(
+      ExpectedNofPropertiesFromEstimate(estimate));
+}
+
+
 void SetExpectedNofPropertiesFromEstimate(Handle<JSFunction> func,
                                           int estimate) {
-  // TODO(1231235): We need dynamic feedback to estimate the number
-  // of expected properties in an object. The static hack below
-  // is barely a solution.
-  SetExpectedNofProperties(func, estimate + 2);
+  SetExpectedNofProperties(
+      func, ExpectedNofPropertiesFromEstimate(estimate));
 }