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

src/heap/mark-compact.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/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 2258 matching lines @@
   InternalizedStringTableCleaner internalized_visitor(heap());
   string_table->IterateElements(&internalized_visitor);
   string_table->ElementsRemoved(internalized_visitor.PointersRemoved());
 
   ExternalStringTableCleaner external_visitor(heap());
   heap()->external_string_table_.Iterate(&external_visitor);
   heap()->external_string_table_.CleanUp();
 
   // Process the weak references.
   MarkCompactWeakObjectRetainer mark_compact_object_retainer;
-  heap()->ProcessWeakReferences(&mark_compact_object_retainer);
+  heap()->ProcessAllWeakReferences(&mark_compact_object_retainer);
 
   // Remove object groups after marking phase.
   heap()->isolate()->global_handles()->RemoveObjectGroups();
   heap()->isolate()->global_handles()->RemoveImplicitRefGroups();
 
   // Flush code from collected candidates.
   if (is_code_flushing_enabled()) {
     code_flusher_->ProcessCandidates();
     // If incremental marker does not support code flushing, we need to
     // disable it before incremental marking steps for next cycle.
@@ skipping 1249 matching lines @@
         WeakHashTable::cast(heap_->weak_object_to_code_table());
     table->Iterate(&updating_visitor);
     table->Rehash(heap_->isolate()->factory()->undefined_value());
   }
 
   // Update pointers from external string table.
   heap_->UpdateReferencesInExternalStringTable(
       &UpdateReferenceInExternalStringTableEntry);
 
   EvacuationWeakObjectRetainer evacuation_object_retainer;
-  heap()->ProcessWeakReferences(&evacuation_object_retainer);
+  heap()->ProcessAllWeakReferences(&evacuation_object_retainer);
 
   // Visit invalidated code (we ignored all slots on it) and clear mark-bits
   // under it.
   ProcessInvalidatedCode(&updating_visitor);
 
   heap_->isolate()->inner_pointer_to_code_cache()->Flush();
 
   slots_buffer_allocator_.DeallocateChain(&migration_slots_buffer_);
   DCHECK(migration_slots_buffer_ == NULL);
 }
@@ skipping 843 matching lines @@
   SlotsBuffer* buffer = *buffer_address;
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 }
 }  // namespace v8::internal