Allocation site pretenuring.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index c484eabe9183401b1b3cce2e571efb85d66ae879..be0ecff57da0b093346e69a172b32ce1365343ca 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -12775,6 +12775,24 @@ void JSObject::TransitionElementsKind(Handle<JSObject> object,
 const double AllocationSite::kPretenureRatio = 0.60;
 
 
+void AllocationSite::ResetPretenureDecision() {
+  dependent_code()->DeoptimizeDependentCodeGroup(
+      GetIsolate(),
+      DependentCode::kAllocationSiteTenuringChangedGroup);
+  set_pretenure_decision(Smi::FromInt(kUndecided));
+  set_memento_found_count(Smi::FromInt(0));
+  set_memento_create_count(Smi::FromInt(0));
+}
+
+
+PretenureFlag AllocationSite::GetPretenureMode() {
+  int mode = pretenure_decision()->value();
+  // Zombie objects "decide" to be untenured.
+  return (mode == kTenure && GetHeap()->GetPretenureMode() == TENURED)
+      ? TENURED : NOT_TENURED;
+}
+
+
 bool AllocationSite::IsNestedSite() {
   ASSERT(FLAG_trace_track_allocation_sites);
   Object* current = GetHeap()->allocation_sites_list();