Expose SameValue equality comparison algorithm

src/api.cc

 // Copyright 2012 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 3037 matching lines @@
     return other->IsString() &&
       i::String::cast(*obj)->Equals(i::String::cast(*other));
   } else if (obj->IsUndefined() || obj->IsUndetectableObject()) {
     return other->IsUndefined() || other->IsUndetectableObject();
   } else {
     return false;
   }
 }
 
 
+bool Value::SameValue(Handle<Value> that) const {
+  i::Isolate* isolate = i::Isolate::Current();
+  if (EmptyCheck("v8::Value::SameValue()", this) ||
+      EmptyCheck("v8::Value::SameValue()", that)) {
+    return false;
+  }
+  LOG_API(isolate, "SameValue");
+  i::Handle<i::Object> obj = Utils::OpenHandle(this);
+  i::Handle<i::Object> other = Utils::OpenHandle(*that);
+  return obj->SameValue(*other);
+}
+
+
 uint32_t Value::Uint32Value() const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   if (obj->IsSmi()) {
     return i::Smi::cast(*obj)->value();
   } else {
     i::Isolate* isolate = i::Isolate::Current();
     LOG_API(isolate, "Uint32Value");
     ENTER_V8(isolate);
     EXCEPTION_PREAMBLE(isolate);
     i::Handle<i::Object> num =
@@ skipping 4461 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