Introduce a PrototypeIterator class and use it for prototype access

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 18 matching lines @@
 #include "src/heap-profiler.h"
 #include "src/heap-snapshot-generator-inl.h"
 #include "src/icu_util.h"
 #include "src/json-parser.h"
 #include "src/messages.h"
 #include "src/natives.h"
 #include "src/parser.h"
 #include "src/profile-generator-inl.h"
 #include "src/property.h"
 #include "src/property-details.h"
+#include "src/prototype.h"
 #include "src/runtime.h"
 #include "src/runtime-profiler.h"
 #include "src/scanner-character-streams.h"
 #include "src/simulator.h"
 #include "src/snapshot.h"
 #include "src/unicode-inl.h"
 #include "src/v8threads.h"
 #include "src/version.h"
 #include "src/vm-state-inl.h"
 
@@ skipping 3167 matching lines @@
   EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
   return Utils::ToLocal(result);
 }
 
 
 Local<Value> v8::Object::GetPrototype() {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::GetPrototype()", return Local<v8::Value>());
   ENTER_V8(isolate);
   i::Handle<i::Object> self = Utils::OpenHandle(this);
-  i::Handle<i::Object> result(self->GetPrototype(isolate), isolate);
-  return Utils::ToLocal(result);
+  i::PrototypeIterator iter(isolate, self);
+  return Utils::ToLocal(i::PrototypeIterator::GetCurrent(iter));
 }
 
 
 bool v8::Object::SetPrototype(Handle<Value> value) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::SetPrototype()", return false);
   ENTER_V8(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
   // We do not allow exceptions thrown while setting the prototype
@@ skipping 4423 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal