[serializer] introduce API to serialize internal fields

src/snapshot/deserializer.cc

 // Copyright 2016 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/snapshot/deserializer.h"
 
 #include "src/bootstrapper.h"
 #include "src/external-reference-table.h"
 #include "src/heap/heap.h"
 #include "src/isolate.h"
@@ skipping 110 matching lines @@
   AddAttachedObject(global_proxy);
 
   DisallowHeapAllocation no_gc;
   // Keep track of the code space start and end pointers in case new
   // code objects were unserialized
   OldSpace* code_space = isolate_->heap()->code_space();
   Address start_address = code_space->top();
   Object* root;
   VisitPointer(&root);
   DeserializeDeferredObjects();
+  DeserializeInternalFields();
 
   isolate->heap()->RegisterReservationsForBlackAllocation(reservations_);
 
   // There's no code deserialized here. If this assert fires then that's
   // changed and logging should be added to notify the profiler et al of the
   // new code, which also has to be flushed from instruction cache.
   CHECK_EQ(start_address, code_space->top());
   return Handle<Object>(root, isolate);
 }
 
@@ skipping 64 matching lines @@
         Object** end = reinterpret_cast<Object**>(obj_address + size);
         bool filled = ReadData(start, end, space, obj_address);
         CHECK(filled);
         DCHECK(CanBeDeferred(object));
         PostProcessNewObject(object, space);
       }
     }
   }
 }
 
+void Deserializer::DeserializeInternalFields() {
+  if (!source_.HasMore() || source_.Get() != kInternalFieldsData) return;
+  DisallowHeapAllocation no_gc;
+  DisallowJavascriptExecution no_js(isolate_);
+  DisallowCompilation no_compile(isolate_);
+  v8::DeserializeInternalFieldsCallback callback =
+      isolate_->deserialize_internal_fields_callback();
+  DCHECK_NOT_NULL(callback);
+  for (int code = source_.Get(); code != kSynchronize; code = source_.Get()) {
+    HandleScope scope(isolate_);
+    int space = code & kSpaceMask;
+    DCHECK(space <= kNumberOfSpaces);
+    DCHECK(code - space == kNewObject);
+    Handle<JSObject> obj(JSObject::cast(GetBackReferencedObject(space)),
+                         isolate_);
+    int index = source_.GetInt();
+    int size = source_.GetInt();
+    byte* data = new byte[size];
+    source_.CopyRaw(data, size);
+    callback(v8::Utils::ToLocal(obj), index,
+             {reinterpret_cast<char*>(data), size});
+    delete[] data;
+  }
+}
+
 // Used to insert a deserialized internalized string into the string table.
 class StringTableInsertionKey : public HashTableKey {
  public:
   explicit StringTableInsertionKey(String* string)
       : string_(string), hash_(HashForObject(string)) {
     DCHECK(string->IsInternalizedString());
   }
 
   bool IsMatch(Object* string) override {
     // We know that all entries in a hash table had their hash keys created.
@@ skipping 600 matching lines @@
 
       default:
         CHECK(false);
     }
   }
   CHECK_EQ(limit, current);
   return true;
 }
 }  // namespace internal
 }  // namespace v8