Implement immutable prototype chains

src/api.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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 1398 matching lines @@
   i::Handle<i::ObjectTemplateInfo> obj =
       i::Handle<i::ObjectTemplateInfo>::cast(struct_obj);
   InitializeTemplate(obj, Consts::OBJECT_TEMPLATE);
   int next_serial_number = 0;
   if (!do_not_cache) {
     next_serial_number = isolate->heap()->GetNextTemplateSerialNumber();
   }
   obj->set_serial_number(i::Smi::FromInt(next_serial_number));
   if (!constructor.IsEmpty())
     obj->set_constructor(*Utils::OpenHandle(*constructor));
-  obj->set_internal_field_count(i::Smi::FromInt(0));
+  obj->set_data(i::Smi::FromInt(0));
   return Utils::ToLocal(obj);
 }
 
 Local<ObjectTemplate> ObjectTemplate::New(
     i::Isolate* isolate, v8::Local<FunctionTemplate> constructor) {
   return ObjectTemplateNew(isolate, constructor, false);
 }
 
 Local<ObjectTemplate> ObjectTemplate::FromSnapshot(Isolate* isolate,
                                                    size_t index) {
@@ skipping 274 matching lines @@
   SET_FIELD_WRAPPED(obj, set_callback, callback);
   if (data.IsEmpty()) {
     data = v8::Undefined(reinterpret_cast<v8::Isolate*>(isolate));
   }
   obj->set_data(*Utils::OpenHandle(*data));
   cons->set_instance_call_handler(*obj);
 }
 
 
 int ObjectTemplate::InternalFieldCount() {
-  return i::Smi::cast(Utils::OpenHandle(this)->internal_field_count())->value();
+  return Utils::OpenHandle(this)->internal_field_count();
 }
 
 
 void ObjectTemplate::SetInternalFieldCount(int value) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (!Utils::ApiCheck(i::Smi::IsValid(value),
                        "v8::ObjectTemplate::SetInternalFieldCount()",
                        "Invalid internal field count")) {
     return;
   }
   ENTER_V8(isolate);
   if (value > 0) {
     // The internal field count is set by the constructor function's
     // construct code, so we ensure that there is a constructor
     // function to do the setting.
     EnsureConstructor(isolate, this);
   }
-  Utils::OpenHandle(this)->set_internal_field_count(i::Smi::FromInt(value));
+  Utils::OpenHandle(this)->set_internal_field_count(value);
 }
 
+bool ObjectTemplate::IsImmutableProto() {
+  return Utils::OpenHandle(this)->immutable_proto();
+}
+
+void ObjectTemplate::SetImmutableProto() {
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  ENTER_V8(isolate);
+  Utils::OpenHandle(this)->set_immutable_proto(true);
+}
 
 // --- S c r i p t s ---
 
 
 // Internally, UnboundScript is a SharedFunctionInfo, and Script is a
 // JSFunction.
 
 ScriptCompiler::CachedData::CachedData(const uint8_t* data_, int length_,
                                        BufferPolicy buffer_policy_)
     : data(data_),
@@ skipping 7154 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8