[api] Make ObjectTemplate::SetNativeDataProperty() work even if the ObjectTemplate does not have a …

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 8218 matching lines @@
     Handle<JSObject> object,
     AllocationSiteUsageContext* site_context,
     DeepCopyHints hints) {
   JSObjectWalkVisitor<AllocationSiteUsageContext> v(site_context, true, hints);
   MaybeHandle<JSObject> copy = v.StructureWalk(object);
   Handle<JSObject> for_assert;
   DCHECK(!copy.ToHandle(&for_assert) || !for_assert.is_identical_to(object));
   return copy;
 }
 
+class DummyContextObject : public AllocationSiteContext {
+ public:
+  explicit DummyContextObject(Isolate* isolate)
+      : AllocationSiteContext(isolate) {}
+
+  bool ShouldCreateMemento(Handle<JSObject> object) { return false; }
+  Handle<AllocationSite> EnterNewScope() { return Handle<AllocationSite>(); }
+  void ExitScope(Handle<AllocationSite> site, Handle<JSObject> object) {}
+};
+
+MaybeHandle<JSObject> JSObject::DeepCopy(Handle<JSObject> object,
+                                         DeepCopyHints hints) {
+  DummyContextObject dummy_context_object(object->GetIsolate());
+  JSObjectWalkVisitor<DummyContextObject> v(&dummy_context_object, true, hints);
+  MaybeHandle<JSObject> copy = v.StructureWalk(object);
+  Handle<JSObject> for_assert;
+  DCHECK(!copy.ToHandle(&for_assert) || !for_assert.is_identical_to(object));
+  return copy;
+}
 
 // static
 MaybeHandle<Object> JSReceiver::ToPrimitive(Handle<JSReceiver> receiver,
                                             ToPrimitiveHint hint) {
   Isolate* const isolate = receiver->GetIsolate();
   Handle<Object> exotic_to_prim;
   ASSIGN_RETURN_ON_EXCEPTION(
       isolate, exotic_to_prim,
       GetMethod(receiver, isolate->factory()->to_primitive_symbol()), Object);
   if (!exotic_to_prim->IsUndefined()) {
@@ skipping 11500 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8