[runtime] Fancify KeyAccumulator

src/runtime/runtime-array.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/conversions-inl.h"
 #include "src/elements.h"
 #include "src/factory.h"
@@ skipping 188 matching lines @@
   CONVERT_NUMBER_CHECKED(uint32_t, length, Uint32, args[1]);
 
   if (!array->elements()->IsDictionary()) {
     RUNTIME_ASSERT(array->HasFastSmiOrObjectElements() ||
                    array->HasFastDoubleElements());
     uint32_t actual_length = static_cast<uint32_t>(array->elements()->length());
     return *isolate->factory()->NewNumberFromUint(Min(actual_length, length));
   }
 
   KeyAccumulator accumulator(isolate);
+  // No need to separate protoype levels sicne we only get numbers/element keys
+  accumulator.NextPrototype();
   for (PrototypeIterator iter(isolate, array,
                               PrototypeIterator::START_AT_RECEIVER);
        !iter.IsAtEnd(); iter.Advance()) {
     if (PrototypeIterator::GetCurrent(iter)->IsJSProxy() ||
         PrototypeIterator::GetCurrent<JSObject>(iter)
             ->HasIndexedInterceptor()) {
       // Bail out if we find a proxy or interceptor, likely not worth
       // collecting keys in that case.
       return *isolate->factory()->NewNumberFromUint(length);
     }
     Handle<JSObject> current = PrototypeIterator::GetCurrent<JSObject>(iter);
-    Handle<FixedArray> current_keys =
-        isolate->factory()->NewFixedArray(current->NumberOfOwnElements(NONE));
-    current->GetOwnElementKeys(*current_keys, NONE);
-    accumulator.AddKeys(current_keys, INCLUDE_SYMBOLS);
+    JSObject::CollectOwnElementKeys(current, &accumulator, NONE);
   }
   // Erase any keys >= length.
   // TODO(adamk): Remove this step when the contract of %GetArrayKeys
   // is changed to let this happen on the JS side.
-  Handle<FixedArray> keys = accumulator.GetKeys();
+  Handle<FixedArray> keys = accumulator.GetKeys(KEEP_NUMBERS);
   for (int i = 0; i < keys->length(); i++) {
     if (NumberToUint32(keys->get(i)) >= length) keys->set_undefined(i);
   }
   return *isolate->factory()->NewJSArrayWithElements(keys);
 }
 
 
 static Object* ArrayConstructorCommon(Isolate* isolate,
                                       Handle<JSFunction> constructor,
                                       Handle<JSFunction> original_constructor,
@@ skipping 253 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_FastOneByteArrayJoin) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
   // Returning undefined means that this fast path fails and one has to resort
   // to a slow path.
   return isolate->heap()->undefined_value();
 }
 }  // namespace internal
 }  // namespace v8