api: Object::CachedProperty

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 7ad66894fdd8ffe3770ba85ccd7a38c4ff9bb72f..e9b069b436ec766e179788e7d73c3c97c41730dc 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -4259,7 +4259,8 @@ MaybeObject* Runtime::GetObjectPropertyOrFail(
 
 MaybeObject* Runtime::GetObjectProperty(Isolate* isolate,
                                         Handle<Object> object,
-                                        Handle<Object> key) {
+                                        Handle<Object> key,
+                                        LookupCache* cache) {
   HandleScope scope(isolate);
 
   if (object->IsUndefined() || object->IsNull()) {
@@ -4292,8 +4293,10 @@ MaybeObject* Runtime::GetObjectProperty(Isolate* isolate,
   // the element if so.
   if (name->AsArrayIndex(&index)) {
     return GetElementOrCharAt(isolate, object, index);
-  } else {
+  } else if (cache == NULL) {
     return object->GetProperty(*name);
+  } else {
+    return cache->GetProperty(object, name);
   }
 }
 
@@ -4557,7 +4560,8 @@ MaybeObject* Runtime::SetObjectProperty(Isolate* isolate,
                                         Handle<Object> key,
                                         Handle<Object> value,
                                         PropertyAttributes attr,
-                                        StrictModeFlag strict_mode) {
+                                        StrictModeFlag strict_mode,
+                                        LookupCache* cache) {
   SetPropertyMode set_mode = attr == NONE ? SET_PROPERTY : DEFINE_PROPERTY;
   HandleScope scope(isolate);
 
@@ -4613,8 +4617,12 @@ MaybeObject* Runtime::SetObjectProperty(Isolate* isolate,
           js_object, index, value, attr, strict_mode, set_mode);
     } else {
       if (name->IsString()) Handle<String>::cast(name)->TryFlatten();
-      result = JSReceiver::SetProperty(
-          js_object, name, value, attr, strict_mode);
+      if (cache == NULL || attr != NONE || strict_mode != kNonStrictMode) {
+        result = JSReceiver::SetProperty(
+            js_object, name, value, attr, strict_mode);
+      } else {
+        return cache->SetProperty(js_object, name, value);
+      }
     }
     if (result.is_null()) return Failure::Exception();
     return *value;