Allocation site pretenuring.

src/objects.cc

 // Copyright 2013 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 12757 matching lines @@
 void JSObject::TransitionElementsKind(Handle<JSObject> object,
                                       ElementsKind to_kind) {
   CALL_HEAP_FUNCTION_VOID(object->GetIsolate(),
                           object->TransitionElementsKind(to_kind));
 }
 
 
 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();
   while (current->IsAllocationSite()) {
     AllocationSite* current_site = AllocationSite::cast(current);
     if (current_site->nested_site() == this) {
       return true;
     }
     current = current_site->weak_next();
   }
@@ skipping 3852 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal