Prototype of mark-and-compact support for Harmony weak maps.

src/heap.cc

 // Copyright 2011 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 1274 matching lines @@
                         template VisitSpecialized<Context::kSize>);
 
     table_.Register(kVisitConsString,
                     &ObjectEvacuationStrategy<POINTER_OBJECT>::
                         template VisitSpecialized<ConsString::kSize>);
 
     table_.Register(kVisitSharedFunctionInfo,
                     &ObjectEvacuationStrategy<POINTER_OBJECT>::
                         template VisitSpecialized<SharedFunctionInfo::kSize>);
 
+    table_.Register(kVisitJSWeakMap,
+                    &ObjectEvacuationStrategy<POINTER_OBJECT>::
+                    Visit);
+
     table_.Register(kVisitJSRegExp,
                     &ObjectEvacuationStrategy<POINTER_OBJECT>::
                     Visit);
 
     table_.Register(kVisitJSFunction,
                     &ObjectEvacuationStrategy<POINTER_OBJECT>::
                         template VisitSpecialized<JSFunction::kSize>);
 
     table_.RegisterSpecializations<ObjectEvacuationStrategy<DATA_OBJECT>,
                                    kVisitDataObject,
@@ skipping 898 matching lines @@
 
   // Allocate cache for external strings pointing to native source code.
   { MaybeObject* maybe_obj = AllocateFixedArray(Natives::GetBuiltinsCount());
     if (!maybe_obj->ToObject(&obj)) return false;
   }
   set_natives_source_cache(FixedArray::cast(obj));
 
   // Handling of script id generation is in FACTORY->NewScript.
   set_last_script_id(undefined_value());
 
+  set_encountered_weak_maps(Smi::FromInt(0));
+
   // Initialize keyed lookup cache.
   isolate_->keyed_lookup_cache()->Clear();
 
   // Initialize context slot cache.
   isolate_->context_slot_cache()->Clear();
 
   // Initialize descriptor cache.
   isolate_->descriptor_lookup_cache()->Clear();
 
   // Initialize compilation cache.
@@ skipping 3823 matching lines @@
 }
 
 
 void ExternalStringTable::TearDown() {
   new_space_strings_.Free();
   old_space_strings_.Free();
 }
 
 
 } }  // namespace v8::internal