Introduce ProcessYoungWeakReferences and process weak list of allocation sites just during full GCs.

src/heap/heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 1579 matching lines @@
   new_space_front = DoScavenge(&scavenge_visitor, new_space_front);
 
   UpdateNewSpaceReferencesInExternalStringTable(
       &UpdateNewSpaceReferenceInExternalStringTableEntry);
 
   promotion_queue_.Destroy();
 
   incremental_marking()->UpdateMarkingDequeAfterScavenge();
 
   ScavengeWeakObjectRetainer weak_object_retainer(this);
-  ProcessWeakReferences(&weak_object_retainer);
+  ProcessYoungWeakReferences(&weak_object_retainer);
 
   DCHECK(new_space_front == new_space_.top());
 
   // Set age mark.
   new_space_.set_age_mark(new_space_.top());
 
   new_space_.LowerInlineAllocationLimit(
       new_space_.inline_allocation_limit_step());
 
   // Update how much has survived scavenge.
@@ skipping 66 matching lines @@
   if (external_string_table_.old_space_strings_.length() > 0) {
     Object** start = &external_string_table_.old_space_strings_[0];
     Object** end = start + external_string_table_.old_space_strings_.length();
     for (Object** p = start; p < end; ++p) *p = updater_func(this, p);
   }
 
   UpdateNewSpaceReferencesInExternalStringTable(updater_func);
 }
 
 
-void Heap::ProcessWeakReferences(WeakObjectRetainer* retainer) {
+void Heap::ProcessAllWeakReferences(WeakObjectRetainer* retainer) {
   ProcessArrayBuffers(retainer);
   ProcessNativeContexts(retainer);
-  // TODO(mvstanton): AllocationSites only need to be processed during
-  // MARK_COMPACT, as they live in old space. Verify and address.
   ProcessAllocationSites(retainer);
   // Collects callback info for handles that are pending (about to be
   // collected) and either phantom or internal-fields.  Releases the global
   // handles.  See also PostGarbageCollectionProcessing.
   isolate()->global_handles()->CollectPhantomCallbackData();
 }
 
 
+void Heap::ProcessYoungWeakReferences(WeakObjectRetainer* retainer) {
+  ProcessArrayBuffers(retainer);
+  ProcessNativeContexts(retainer);
+  // Collects callback info for handles that are pending (about to be
+  // collected) and either phantom or internal-fields.  Releases the global
+  // handles.  See also PostGarbageCollectionProcessing.
+  isolate()->global_handles()->CollectPhantomCallbackData();
+}
+
+
 void Heap::ProcessNativeContexts(WeakObjectRetainer* retainer) {
   Object* head = VisitWeakList<Context>(this, native_contexts_list(), retainer);
   // Update the head of the list of contexts.
   set_native_contexts_list(head);
 }
 
 
 void Heap::ProcessArrayBuffers(WeakObjectRetainer* retainer) {
   Object* array_buffer_obj =
       VisitWeakList<JSArrayBuffer>(this, array_buffers_list(), retainer);
@@ skipping 4735 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   CODE_AGE_LIST_COMPLETE(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 }
 }  // namespace v8::internal