Split off remaining runtime functions in runtime.cc.

src/runtime/runtime.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 <stdlib.h>
-#include <limits>
-
 #include "src/v8.h"
 
-#include "src/accessors.h"
-#include "src/api.h"
-#include "src/arguments.h"
-#include "src/bailout-reason.h"
-#include "src/base/cpu.h"
-#include "src/base/platform/platform.h"
-#include "src/bootstrapper.h"
-#include "src/conversions.h"
-#include "src/global-handles.h"
-#include "src/isolate-inl.h"
-#include "src/prototype.h"
 #include "src/runtime/runtime.h"
 #include "src/runtime/runtime-utils.h"
-#include "src/utils.h"
-
 
 namespace v8 {
 namespace internal {
 
 // Header of runtime functions.
 #define F(name, number_of_args, result_size)                    \
   Object* Runtime_##name(int args_length, Object** args_object, \
                          Isolate* isolate);
 
 #define P(name, number_of_args, result_size)                       \
   ObjectPair Runtime_##name(int args_length, Object** args_object, \
                             Isolate* isolate);
 
+// Reference implementation for inlined runtime functions.  Only used when the
+// compiler does not support a certain intrinsic.  Don't optimize these, but
+// implement the intrinsic in the respective compiler instead.
+// TODO(mstarzinger): These are place-holder stubs for TurboFan and will
+// eventually all have a C++ implementation and this macro will be gone.
 #define I(name, number_of_args, result_size)                             \
   Object* RuntimeReference_##name(int args_length, Object** args_object, \
                                   Isolate* isolate);
 
 RUNTIME_FUNCTION_LIST_RETURN_OBJECT(F)
 RUNTIME_FUNCTION_LIST_RETURN_PAIR(P)
 INLINE_OPTIMIZED_FUNCTION_LIST(F)
 INLINE_FUNCTION_LIST(I)
 
 #undef I
 #undef F
 #undef P
 
 
-MUST_USE_RESULT static MaybeHandle<Object> TransitionElements(
-    Handle<Object> object, ElementsKind to_kind, Isolate* isolate) {
-  HandleScope scope(isolate);
-  if (!object->IsJSObject()) {
-    isolate->ThrowIllegalOperation();
-    return MaybeHandle<Object>();
-  }
-  ElementsKind from_kind =
-      Handle<JSObject>::cast(object)->map()->elements_kind();
-  if (Map::IsValidElementsTransition(from_kind, to_kind)) {
-    JSObject::TransitionElementsKind(Handle<JSObject>::cast(object), to_kind);
-    return object;
-  }
-  isolate->ThrowIllegalOperation();
-  return MaybeHandle<Object>();
-}
-
-
-RUNTIME_FUNCTION(Runtime_GetPrototype) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, obj, 0);
-  // We don't expect access checks to be needed on JSProxy objects.
-  DCHECK(!obj->IsAccessCheckNeeded() || obj->IsJSObject());
-  PrototypeIterator iter(isolate, obj, PrototypeIterator::START_AT_RECEIVER);
-  do {
-    if (PrototypeIterator::GetCurrent(iter)->IsAccessCheckNeeded() &&
-        !isolate->MayNamedAccess(
-            Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter)),
-            isolate->factory()->proto_string(), v8::ACCESS_GET)) {
-      isolate->ReportFailedAccessCheck(
-          Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter)),
-          v8::ACCESS_GET);
-      RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
-      return isolate->heap()->undefined_value();
-    }
-    iter.AdvanceIgnoringProxies();
-    if (PrototypeIterator::GetCurrent(iter)->IsJSProxy()) {
-      return *PrototypeIterator::GetCurrent(iter);
-    }
-  } while (!iter.IsAtEnd(PrototypeIterator::END_AT_NON_HIDDEN));
-  return *PrototypeIterator::GetCurrent(iter);
-}
-
-
-RUNTIME_FUNCTION(Runtime_InternalSetPrototype) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 1);
-  DCHECK(!obj->IsAccessCheckNeeded());
-  DCHECK(!obj->map()->is_observed());
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, JSObject::SetPrototype(obj, prototype, false));
-  return *result;
-}
-
-
-RUNTIME_FUNCTION(Runtime_SetPrototype) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 1);
-  if (obj->IsAccessCheckNeeded() &&
-      !isolate->MayNamedAccess(obj, isolate->factory()->proto_string(),
-                               v8::ACCESS_SET)) {
-    isolate->ReportFailedAccessCheck(obj, v8::ACCESS_SET);
-    RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
-    return isolate->heap()->undefined_value();
-  }
-  if (obj->map()->is_observed()) {
-    Handle<Object> old_value =
-        Object::GetPrototypeSkipHiddenPrototypes(isolate, obj);
-    Handle<Object> result;
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-        isolate, result, JSObject::SetPrototype(obj, prototype, true));
-
-    Handle<Object> new_value =
-        Object::GetPrototypeSkipHiddenPrototypes(isolate, obj);
-    if (!new_value->SameValue(*old_value)) {
-      JSObject::EnqueueChangeRecord(
-          obj, "setPrototype", isolate->factory()->proto_string(), old_value);
-    }
-    return *result;
-  }
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, JSObject::SetPrototype(obj, prototype, true));
-  return *result;
-}
-
-
-RUNTIME_FUNCTION(Runtime_IsInPrototypeChain) {
-  HandleScope shs(isolate);
-  DCHECK(args.length() == 2);
-  // See ECMA-262, section 15.3.5.3, page 88 (steps 5 - 8).
-  CONVERT_ARG_HANDLE_CHECKED(Object, O, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, V, 1);
-  PrototypeIterator iter(isolate, V, PrototypeIterator::START_AT_RECEIVER);
-  while (true) {
-    iter.AdvanceIgnoringProxies();
-    if (iter.IsAtEnd()) return isolate->heap()->false_value();
-    if (iter.IsAtEnd(O)) return isolate->heap()->true_value();
-  }
-}
-
-
-// Enumerator used as indices into the array returned from GetOwnProperty
-enum PropertyDescriptorIndices {
-  IS_ACCESSOR_INDEX,
-  VALUE_INDEX,
-  GETTER_INDEX,
-  SETTER_INDEX,
-  WRITABLE_INDEX,
-  ENUMERABLE_INDEX,
-  CONFIGURABLE_INDEX,
-  DESCRIPTOR_SIZE
-};
-
-
-MUST_USE_RESULT static MaybeHandle<Object> GetOwnProperty(Isolate* isolate,
-                                                          Handle<JSObject> obj,
-                                                          Handle<Name> name) {
-  Heap* heap = isolate->heap();
-  Factory* factory = isolate->factory();
-
-  PropertyAttributes attrs;
-  uint32_t index = 0;
-  Handle<Object> value;
-  MaybeHandle<AccessorPair> maybe_accessors;
-  // TODO(verwaest): Unify once indexed properties can be handled by the
-  // LookupIterator.
-  if (name->AsArrayIndex(&index)) {
-    // Get attributes.
-    Maybe<PropertyAttributes> maybe =
-        JSReceiver::GetOwnElementAttribute(obj, index);
-    if (!maybe.has_value) return MaybeHandle<Object>();
-    attrs = maybe.value;
-    if (attrs == ABSENT) return factory->undefined_value();
-
-    // Get AccessorPair if present.
-    maybe_accessors = JSObject::GetOwnElementAccessorPair(obj, index);
-
-    // Get value if not an AccessorPair.
-    if (maybe_accessors.is_null()) {
-      ASSIGN_RETURN_ON_EXCEPTION(
-          isolate, value, Runtime::GetElementOrCharAt(isolate, obj, index),
-          Object);
-    }
-  } else {
-    // Get attributes.
-    LookupIterator it(obj, name, LookupIterator::HIDDEN);
-    Maybe<PropertyAttributes> maybe = JSObject::GetPropertyAttributes(&it);
-    if (!maybe.has_value) return MaybeHandle<Object>();
-    attrs = maybe.value;
-    if (attrs == ABSENT) return factory->undefined_value();
-
-    // Get AccessorPair if present.
-    if (it.state() == LookupIterator::ACCESSOR &&
-        it.GetAccessors()->IsAccessorPair()) {
-      maybe_accessors = Handle<AccessorPair>::cast(it.GetAccessors());
-    }
-
-    // Get value if not an AccessorPair.
-    if (maybe_accessors.is_null()) {
-      ASSIGN_RETURN_ON_EXCEPTION(isolate, value, Object::GetProperty(&it),
-                                 Object);
-    }
-  }
-  DCHECK(!isolate->has_pending_exception());
-  Handle<FixedArray> elms = factory->NewFixedArray(DESCRIPTOR_SIZE);
-  elms->set(ENUMERABLE_INDEX, heap->ToBoolean((attrs & DONT_ENUM) == 0));
-  elms->set(CONFIGURABLE_INDEX, heap->ToBoolean((attrs & DONT_DELETE) == 0));
-  elms->set(IS_ACCESSOR_INDEX, heap->ToBoolean(!maybe_accessors.is_null()));
-
-  Handle<AccessorPair> accessors;
-  if (maybe_accessors.ToHandle(&accessors)) {
-    Handle<Object> getter(accessors->GetComponent(ACCESSOR_GETTER), isolate);
-    Handle<Object> setter(accessors->GetComponent(ACCESSOR_SETTER), isolate);
-    elms->set(GETTER_INDEX, *getter);
-    elms->set(SETTER_INDEX, *setter);
-  } else {
-    elms->set(WRITABLE_INDEX, heap->ToBoolean((attrs & READ_ONLY) == 0));
-    elms->set(VALUE_INDEX, *value);
-  }
-
-  return factory->NewJSArrayWithElements(elms);
-}
-
-
-// Returns an array with the property description:
-//  if args[1] is not a property on args[0]
-//          returns undefined
-//  if args[1] is a data property on args[0]
-//         [false, value, Writeable, Enumerable, Configurable]
-//  if args[1] is an accessor on args[0]
-//         [true, GetFunction, SetFunction, Enumerable, Configurable]
-RUNTIME_FUNCTION(Runtime_GetOwnProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
-                                     GetOwnProperty(isolate, obj, name));
-  return *result;
-}
-
-
-RUNTIME_FUNCTION(Runtime_PreventExtensions) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
-                                     JSObject::PreventExtensions(obj));
-  return *result;
-}
-
-
-RUNTIME_FUNCTION(Runtime_IsExtensible) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(JSObject, obj, 0);
-  if (obj->IsJSGlobalProxy()) {
-    PrototypeIterator iter(isolate, obj);
-    if (iter.IsAtEnd()) return isolate->heap()->false_value();
-    DCHECK(iter.GetCurrent()->IsJSGlobalObject());
-    obj = JSObject::cast(iter.GetCurrent());
-  }
-  return isolate->heap()->ToBoolean(obj->map()->is_extensible());
-}
-
-
-RUNTIME_FUNCTION(Runtime_CreateApiFunction) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(FunctionTemplateInfo, data, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 1);
-  return *isolate->factory()->CreateApiFunction(data, prototype);
-}
-
-
-RUNTIME_FUNCTION(Runtime_IsTemplate) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, arg, 0);
-  bool result = arg->IsObjectTemplateInfo() || arg->IsFunctionTemplateInfo();
-  return isolate->heap()->ToBoolean(result);
-}
-
-
-RUNTIME_FUNCTION(Runtime_GetTemplateField) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_CHECKED(HeapObject, templ, 0);
-  CONVERT_SMI_ARG_CHECKED(index, 1);
-  int offset = index * kPointerSize + HeapObject::kHeaderSize;
-  InstanceType type = templ->map()->instance_type();
-  RUNTIME_ASSERT(type == FUNCTION_TEMPLATE_INFO_TYPE ||
-                 type == OBJECT_TEMPLATE_INFO_TYPE);
-  RUNTIME_ASSERT(offset > 0);
-  if (type == FUNCTION_TEMPLATE_INFO_TYPE) {
-    RUNTIME_ASSERT(offset < FunctionTemplateInfo::kSize);
-  } else {
-    RUNTIME_ASSERT(offset < ObjectTemplateInfo::kSize);
-  }
-  return *HeapObject::RawField(templ, offset);
-}
-
-
-RUNTIME_FUNCTION(Runtime_DisableAccessChecks) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(HeapObject, object, 0);
-  Handle<Map> old_map(object->map());
-  bool needs_access_checks = old_map->is_access_check_needed();
-  if (needs_access_checks) {
-    // Copy map so it won't interfere constructor's initial map.
-    Handle<Map> new_map = Map::Copy(old_map);
-    new_map->set_is_access_check_needed(false);
-    JSObject::MigrateToMap(Handle<JSObject>::cast(object), new_map);
-  }
-  return isolate->heap()->ToBoolean(needs_access_checks);
-}
-
-
-RUNTIME_FUNCTION(Runtime_EnableAccessChecks) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  Handle<Map> old_map(object->map());
-  RUNTIME_ASSERT(!old_map->is_access_check_needed());
-  // Copy map so it won't interfere constructor's initial map.
-  Handle<Map> new_map = Map::Copy(old_map);
-  new_map->set_is_access_check_needed(true);
-  JSObject::MigrateToMap(object, new_map);
-  return isolate->heap()->undefined_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_OptimizeObjectForAddingMultipleProperties) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  CONVERT_SMI_ARG_CHECKED(properties, 1);
-  // Conservative upper limit to prevent fuzz tests from going OOM.
-  RUNTIME_ASSERT(properties <= 100000);
-  if (object->HasFastProperties() && !object->IsJSGlobalProxy()) {
-    JSObject::NormalizeProperties(object, KEEP_INOBJECT_PROPERTIES, properties);
-  }
-  return *object;
-}
-
-
-RUNTIME_FUNCTION(Runtime_FinishArrayPrototypeSetup) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSArray, prototype, 0);
-  Object* length = prototype->length();
-  RUNTIME_ASSERT(length->IsSmi() && Smi::cast(length)->value() == 0);
-  RUNTIME_ASSERT(prototype->HasFastSmiOrObjectElements());
-  // This is necessary to enable fast checks for absence of elements
-  // on Array.prototype and below.
-  prototype->set_elements(isolate->heap()->empty_fixed_array());
-  return Smi::FromInt(0);
-}
-
-
-static void InstallBuiltin(Isolate* isolate, Handle<JSObject> holder,
-                           const char* name, Builtins::Name builtin_name) {
-  Handle<String> key = isolate->factory()->InternalizeUtf8String(name);
-  Handle<Code> code(isolate->builtins()->builtin(builtin_name));
-  Handle<JSFunction> optimized =
-      isolate->factory()->NewFunctionWithoutPrototype(key, code);
-  optimized->shared()->DontAdaptArguments();
-  JSObject::AddProperty(holder, key, optimized, NONE);
-}
-
-
-RUNTIME_FUNCTION(Runtime_SpecialArrayFunctions) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 0);
-  Handle<JSObject> holder =
-      isolate->factory()->NewJSObject(isolate->object_function());
-
-  InstallBuiltin(isolate, holder, "pop", Builtins::kArrayPop);
-  InstallBuiltin(isolate, holder, "push", Builtins::kArrayPush);
-  InstallBuiltin(isolate, holder, "shift", Builtins::kArrayShift);
-  InstallBuiltin(isolate, holder, "unshift", Builtins::kArrayUnshift);
-  InstallBuiltin(isolate, holder, "slice", Builtins::kArraySlice);
-  InstallBuiltin(isolate, holder, "splice", Builtins::kArraySplice);
-  InstallBuiltin(isolate, holder, "concat", Builtins::kArrayConcat);
-
-  return *holder;
-}
-
-
-RUNTIME_FUNCTION(Runtime_ObjectFreeze) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-
-  // %ObjectFreeze is a fast path and these cases are handled elsewhere.
-  RUNTIME_ASSERT(!object->HasSloppyArgumentsElements() &&
-                 !object->map()->is_observed() && !object->IsJSProxy());
-
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, JSObject::Freeze(object));
-  return *result;
-}
-
-
-// Returns a single character string where first character equals
-// string->Get(index).
-static Handle<Object> GetCharAt(Handle<String> string, uint32_t index) {
-  if (index < static_cast<uint32_t>(string->length())) {
-    Factory* factory = string->GetIsolate()->factory();
-    return factory->LookupSingleCharacterStringFromCode(
-        String::Flatten(string)->Get(index));
-  }
-  return Execution::CharAt(string, index);
-}
-
-
-MaybeHandle<Object> Runtime::GetElementOrCharAt(Isolate* isolate,
-                                                Handle<Object> object,
-                                                uint32_t index) {
-  // Handle [] indexing on Strings
-  if (object->IsString()) {
-    Handle<Object> result = GetCharAt(Handle<String>::cast(object), index);
-    if (!result->IsUndefined()) return result;
-  }
-
-  // Handle [] indexing on String objects
-  if (object->IsStringObjectWithCharacterAt(index)) {
-    Handle<JSValue> js_value = Handle<JSValue>::cast(object);
-    Handle<Object> result =
-        GetCharAt(Handle<String>(String::cast(js_value->value())), index);
-    if (!result->IsUndefined()) return result;
-  }
-
-  Handle<Object> result;
-  if (object->IsString() || object->IsNumber() || object->IsBoolean()) {
-    PrototypeIterator iter(isolate, object);
-    return Object::GetElement(isolate, PrototypeIterator::GetCurrent(iter),
-                              index);
-  } else {
-    return Object::GetElement(isolate, object, index);
-  }
-}
-
-
-MaybeHandle<Name> Runtime::ToName(Isolate* isolate, Handle<Object> key) {
-  if (key->IsName()) {
-    return Handle<Name>::cast(key);
-  } else {
-    Handle<Object> converted;
-    ASSIGN_RETURN_ON_EXCEPTION(isolate, converted,
-                               Execution::ToString(isolate, key), Name);
-    return Handle<Name>::cast(converted);
-  }
-}
-
-
-MaybeHandle<Object> Runtime::HasObjectProperty(Isolate* isolate,
-                                               Handle<JSReceiver> object,
-                                               Handle<Object> key) {
-  Maybe<bool> maybe;
-  // Check if the given key is an array index.
-  uint32_t index;
-  if (key->ToArrayIndex(&index)) {
-    maybe = JSReceiver::HasElement(object, index);
-  } else {
-    // Convert the key to a name - possibly by calling back into JavaScript.
-    Handle<Name> name;
-    ASSIGN_RETURN_ON_EXCEPTION(isolate, name, ToName(isolate, key), Object);
-
-    maybe = JSReceiver::HasProperty(object, name);
-  }
-
-  if (!maybe.has_value) return MaybeHandle<Object>();
-  return isolate->factory()->ToBoolean(maybe.value);
-}
-
-
-MaybeHandle<Object> Runtime::GetObjectProperty(Isolate* isolate,
-                                               Handle<Object> object,
-                                               Handle<Object> key) {
-  if (object->IsUndefined() || object->IsNull()) {
-    Handle<Object> args[2] = {key, object};
-    THROW_NEW_ERROR(isolate, NewTypeError("non_object_property_load",
-                                          HandleVector(args, 2)),
-                    Object);
-  }
-
-  // Check if the given key is an array index.
-  uint32_t index;
-  if (key->ToArrayIndex(&index)) {
-    return GetElementOrCharAt(isolate, object, index);
-  }
-
-  // Convert the key to a name - possibly by calling back into JavaScript.
-  Handle<Name> name;
-  ASSIGN_RETURN_ON_EXCEPTION(isolate, name, ToName(isolate, key), Object);
-
-  // Check if the name is trivially convertible to an index and get
-  // the element if so.
-  if (name->AsArrayIndex(&index)) {
-    return GetElementOrCharAt(isolate, object, index);
-  } else {
-    return Object::GetProperty(object, name);
-  }
-}
-
-
-RUNTIME_FUNCTION(Runtime_GetProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-
-  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, Runtime::GetObjectProperty(isolate, object, key));
-  return *result;
-}
-
-
-// KeyedGetProperty is called from KeyedLoadIC::GenerateGeneric.
-RUNTIME_FUNCTION(Runtime_KeyedGetProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-
-  CONVERT_ARG_HANDLE_CHECKED(Object, receiver_obj, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, key_obj, 1);
-
-  // Fast cases for getting named properties of the receiver JSObject
-  // itself.
-  //
-  // The global proxy objects has to be excluded since LookupOwn on
-  // the global proxy object can return a valid result even though the
-  // global proxy object never has properties.  This is the case
-  // because the global proxy object forwards everything to its hidden
-  // prototype including own lookups.
-  //
-  // Additionally, we need to make sure that we do not cache results
-  // for objects that require access checks.
-  if (receiver_obj->IsJSObject()) {
-    if (!receiver_obj->IsJSGlobalProxy() &&
-        !receiver_obj->IsAccessCheckNeeded() && key_obj->IsName()) {
-      DisallowHeapAllocation no_allocation;
-      Handle<JSObject> receiver = Handle<JSObject>::cast(receiver_obj);
-      Handle<Name> key = Handle<Name>::cast(key_obj);
-      if (receiver->HasFastProperties()) {
-        // Attempt to use lookup cache.
-        Handle<Map> receiver_map(receiver->map(), isolate);
-        KeyedLookupCache* keyed_lookup_cache = isolate->keyed_lookup_cache();
-        int index = keyed_lookup_cache->Lookup(receiver_map, key);
-        if (index != -1) {
-          // Doubles are not cached, so raw read the value.
-          return receiver->RawFastPropertyAt(
-              FieldIndex::ForKeyedLookupCacheIndex(*receiver_map, index));
-        }
-        // Lookup cache miss.  Perform lookup and update the cache if
-        // appropriate.
-        LookupIterator it(receiver, key, LookupIterator::OWN);
-        if (it.state() == LookupIterator::DATA &&
-            it.property_details().type() == FIELD) {
-          FieldIndex field_index = it.GetFieldIndex();
-          // Do not track double fields in the keyed lookup cache. Reading
-          // double values requires boxing.
-          if (!it.representation().IsDouble()) {
-            keyed_lookup_cache->Update(receiver_map, key,
-                                       field_index.GetKeyedLookupCacheIndex());
-          }
-          AllowHeapAllocation allow_allocation;
-          return *JSObject::FastPropertyAt(receiver, it.representation(),
-                                           field_index);
-        }
-      } else {
-        // Attempt dictionary lookup.
-        NameDictionary* dictionary = receiver->property_dictionary();
-        int entry = dictionary->FindEntry(key);
-        if ((entry != NameDictionary::kNotFound) &&
-            (dictionary->DetailsAt(entry).type() == NORMAL)) {
-          Object* value = dictionary->ValueAt(entry);
-          if (!receiver->IsGlobalObject()) return value;
-          value = PropertyCell::cast(value)->value();
-          if (!value->IsTheHole()) return value;
-          // If value is the hole (meaning, absent) do the general lookup.
-        }
-      }
-    } else if (key_obj->IsSmi()) {
-      // JSObject without a name key. If the key is a Smi, check for a
-      // definite out-of-bounds access to elements, which is a strong indicator
-      // that subsequent accesses will also call the runtime. Proactively
-      // transition elements to FAST_*_ELEMENTS to avoid excessive boxing of
-      // doubles for those future calls in the case that the elements would
-      // become FAST_DOUBLE_ELEMENTS.
-      Handle<JSObject> js_object = Handle<JSObject>::cast(receiver_obj);
-      ElementsKind elements_kind = js_object->GetElementsKind();
-      if (IsFastDoubleElementsKind(elements_kind)) {
-        Handle<Smi> key = Handle<Smi>::cast(key_obj);
-        if (key->value() >= js_object->elements()->length()) {
-          if (IsFastHoleyElementsKind(elements_kind)) {
-            elements_kind = FAST_HOLEY_ELEMENTS;
-          } else {
-            elements_kind = FAST_ELEMENTS;
-          }
-          RETURN_FAILURE_ON_EXCEPTION(
-              isolate, TransitionElements(js_object, elements_kind, isolate));
-        }
-      } else {
-        DCHECK(IsFastSmiOrObjectElementsKind(elements_kind) ||
-               !IsFastElementsKind(elements_kind));
-      }
-    }
-  } else if (receiver_obj->IsString() && key_obj->IsSmi()) {
-    // Fast case for string indexing using [] with a smi index.
-    Handle<String> str = Handle<String>::cast(receiver_obj);
-    int index = args.smi_at(1);
-    if (index >= 0 && index < str->length()) {
-      return *GetCharAt(str, index);
-    }
-  }
-
-  // Fall back to GetObjectProperty.
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result,
-      Runtime::GetObjectProperty(isolate, receiver_obj, key_obj));
-  return *result;
-}
-
-
-static bool IsValidAccessor(Handle<Object> obj) {
-  return obj->IsUndefined() || obj->IsSpecFunction() || obj->IsNull();
-}
-
-
-// Transform getter or setter into something DefineAccessor can handle.
-static Handle<Object> InstantiateAccessorComponent(Isolate* isolate,
-                                                   Handle<Object> component) {
-  if (component->IsUndefined()) return isolate->factory()->undefined_value();
-  Handle<FunctionTemplateInfo> info =
-      Handle<FunctionTemplateInfo>::cast(component);
-  return Utils::OpenHandle(*Utils::ToLocal(info)->GetFunction());
-}
-
-
-RUNTIME_FUNCTION(Runtime_DefineApiAccessorProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 5);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, getter, 2);
-  CONVERT_ARG_HANDLE_CHECKED(Object, setter, 3);
-  CONVERT_SMI_ARG_CHECKED(attribute, 4);
-  RUNTIME_ASSERT(getter->IsUndefined() || getter->IsFunctionTemplateInfo());
-  RUNTIME_ASSERT(setter->IsUndefined() || setter->IsFunctionTemplateInfo());
-  RUNTIME_ASSERT(PropertyDetails::AttributesField::is_valid(
-      static_cast<PropertyAttributes>(attribute)));
-  RETURN_FAILURE_ON_EXCEPTION(
-      isolate, JSObject::DefineAccessor(
-                   object, name, InstantiateAccessorComponent(isolate, getter),
-                   InstantiateAccessorComponent(isolate, setter),
-                   static_cast<PropertyAttributes>(attribute)));
-  return isolate->heap()->undefined_value();
-}
-
-
-// Implements part of 8.12.9 DefineOwnProperty.
-// There are 3 cases that lead here:
-// Step 4b - define a new accessor property.
-// Steps 9c & 12 - replace an existing data property with an accessor property.
-// Step 12 - update an existing accessor property with an accessor or generic
-//           descriptor.
-RUNTIME_FUNCTION(Runtime_DefineAccessorPropertyUnchecked) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 5);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
-  RUNTIME_ASSERT(!obj->IsNull());
-  CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, getter, 2);
-  RUNTIME_ASSERT(IsValidAccessor(getter));
-  CONVERT_ARG_HANDLE_CHECKED(Object, setter, 3);
-  RUNTIME_ASSERT(IsValidAccessor(setter));
-  CONVERT_SMI_ARG_CHECKED(unchecked, 4);
-  RUNTIME_ASSERT((unchecked & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
-  PropertyAttributes attr = static_cast<PropertyAttributes>(unchecked);
-
-  bool fast = obj->HasFastProperties();
-  RETURN_FAILURE_ON_EXCEPTION(
-      isolate, JSObject::DefineAccessor(obj, name, getter, setter, attr));
-  if (fast) JSObject::MigrateSlowToFast(obj, 0);
-  return isolate->heap()->undefined_value();
-}
-
-
-// Implements part of 8.12.9 DefineOwnProperty.
-// There are 3 cases that lead here:
-// Step 4a - define a new data property.
-// Steps 9b & 12 - replace an existing accessor property with a data property.
-// Step 12 - update an existing data property with a data or generic
-//           descriptor.
-RUNTIME_FUNCTION(Runtime_DefineDataPropertyUnchecked) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 4);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, js_object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, obj_value, 2);
-  CONVERT_SMI_ARG_CHECKED(unchecked, 3);
-  RUNTIME_ASSERT((unchecked & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
-  PropertyAttributes attr = static_cast<PropertyAttributes>(unchecked);
-
-  LookupIterator it(js_object, name, LookupIterator::OWN_SKIP_INTERCEPTOR);
-  if (it.IsFound() && it.state() == LookupIterator::ACCESS_CHECK) {
-    if (!isolate->MayNamedAccess(js_object, name, v8::ACCESS_SET)) {
-      return isolate->heap()->undefined_value();
-    }
-    it.Next();
-  }
-
-  // Take special care when attributes are different and there is already
-  // a property.
-  if (it.state() == LookupIterator::ACCESSOR) {
-    // Use IgnoreAttributes version since a readonly property may be
-    // overridden and SetProperty does not allow this.
-    Handle<Object> result;
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-        isolate, result,
-        JSObject::SetOwnPropertyIgnoreAttributes(
-            js_object, name, obj_value, attr, JSObject::DONT_FORCE_FIELD));
-    return *result;
-  }
-
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result,
-      Runtime::DefineObjectProperty(js_object, name, obj_value, attr));
-  return *result;
-}
-
-
-// Return property without being observable by accessors or interceptors.
-RUNTIME_FUNCTION(Runtime_GetDataProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
-  return *JSObject::GetDataProperty(object, key);
-}
-
-
-MaybeHandle<Object> Runtime::SetObjectProperty(Isolate* isolate,
-                                               Handle<Object> object,
-                                               Handle<Object> key,
-                                               Handle<Object> value,
-                                               StrictMode strict_mode) {
-  if (object->IsUndefined() || object->IsNull()) {
-    Handle<Object> args[2] = {key, object};
-    THROW_NEW_ERROR(isolate, NewTypeError("non_object_property_store",
-                                          HandleVector(args, 2)),
-                    Object);
-  }
-
-  if (object->IsJSProxy()) {
-    Handle<Object> name_object;
-    if (key->IsSymbol()) {
-      name_object = key;
-    } else {
-      ASSIGN_RETURN_ON_EXCEPTION(isolate, name_object,
-                                 Execution::ToString(isolate, key), Object);
-    }
-    Handle<Name> name = Handle<Name>::cast(name_object);
-    return Object::SetProperty(Handle<JSProxy>::cast(object), name, value,
-                               strict_mode);
-  }
-
-  // Check if the given key is an array index.
-  uint32_t index;
-  if (key->ToArrayIndex(&index)) {
-    // TODO(verwaest): Support non-JSObject receivers.
-    if (!object->IsJSObject()) return value;
-    Handle<JSObject> js_object = Handle<JSObject>::cast(object);
-
-    // In Firefox/SpiderMonkey, Safari and Opera you can access the characters
-    // of a string using [] notation.  We need to support this too in
-    // JavaScript.
-    // In the case of a String object we just need to redirect the assignment to
-    // the underlying string if the index is in range.  Since the underlying
-    // string does nothing with the assignment then we can ignore such
-    // assignments.
-    if (js_object->IsStringObjectWithCharacterAt(index)) {
-      return value;
-    }
-
-    JSObject::ValidateElements(js_object);
-    if (js_object->HasExternalArrayElements() ||
-        js_object->HasFixedTypedArrayElements()) {
-      if (!value->IsNumber() && !value->IsUndefined()) {
-        ASSIGN_RETURN_ON_EXCEPTION(isolate, value,
-                                   Execution::ToNumber(isolate, value), Object);
-      }
-    }
-
-    MaybeHandle<Object> result = JSObject::SetElement(
-        js_object, index, value, NONE, strict_mode, true, SET_PROPERTY);
-    JSObject::ValidateElements(js_object);
-
-    return result.is_null() ? result : value;
-  }
-
-  if (key->IsName()) {
-    Handle<Name> name = Handle<Name>::cast(key);
-    if (name->AsArrayIndex(&index)) {
-      // TODO(verwaest): Support non-JSObject receivers.
-      if (!object->IsJSObject()) return value;
-      Handle<JSObject> js_object = Handle<JSObject>::cast(object);
-      if (js_object->HasExternalArrayElements()) {
-        if (!value->IsNumber() && !value->IsUndefined()) {
-          ASSIGN_RETURN_ON_EXCEPTION(
-              isolate, value, Execution::ToNumber(isolate, value), Object);
-        }
-      }
-      return JSObject::SetElement(js_object, index, value, NONE, strict_mode,
-                                  true, SET_PROPERTY);
-    } else {
-      if (name->IsString()) name = String::Flatten(Handle<String>::cast(name));
-      return Object::SetProperty(object, name, value, strict_mode);
-    }
-  }
-
-  // Call-back into JavaScript to convert the key to a string.
-  Handle<Object> converted;
-  ASSIGN_RETURN_ON_EXCEPTION(isolate, converted,
-                             Execution::ToString(isolate, key), Object);
-  Handle<String> name = Handle<String>::cast(converted);
-
-  if (name->AsArrayIndex(&index)) {
-    // TODO(verwaest): Support non-JSObject receivers.
-    if (!object->IsJSObject()) return value;
-    Handle<JSObject> js_object = Handle<JSObject>::cast(object);
-    return JSObject::SetElement(js_object, index, value, NONE, strict_mode,
-                                true, SET_PROPERTY);
-  }
-  return Object::SetProperty(object, name, value, strict_mode);
-}
-
-
-MaybeHandle<Object> Runtime::DefineObjectProperty(Handle<JSObject> js_object,
-                                                  Handle<Object> key,
-                                                  Handle<Object> value,
-                                                  PropertyAttributes attr) {
-  Isolate* isolate = js_object->GetIsolate();
-  // Check if the given key is an array index.
-  uint32_t index;
-  if (key->ToArrayIndex(&index)) {
-    // In Firefox/SpiderMonkey, Safari and Opera you can access the characters
-    // of a string using [] notation.  We need to support this too in
-    // JavaScript.
-    // In the case of a String object we just need to redirect the assignment to
-    // the underlying string if the index is in range.  Since the underlying
-    // string does nothing with the assignment then we can ignore such
-    // assignments.
-    if (js_object->IsStringObjectWithCharacterAt(index)) {
-      return value;
-    }
-
-    return JSObject::SetElement(js_object, index, value, attr, SLOPPY, false,
-                                DEFINE_PROPERTY);
-  }
-
-  if (key->IsName()) {
-    Handle<Name> name = Handle<Name>::cast(key);
-    if (name->AsArrayIndex(&index)) {
-      return JSObject::SetElement(js_object, index, value, attr, SLOPPY, false,
-                                  DEFINE_PROPERTY);
-    } else {
-      if (name->IsString()) name = String::Flatten(Handle<String>::cast(name));
-      return JSObject::SetOwnPropertyIgnoreAttributes(js_object, name, value,
-                                                      attr);
-    }
-  }
-
-  // Call-back into JavaScript to convert the key to a string.
-  Handle<Object> converted;
-  ASSIGN_RETURN_ON_EXCEPTION(isolate, converted,
-                             Execution::ToString(isolate, key), Object);
-  Handle<String> name = Handle<String>::cast(converted);
-
-  if (name->AsArrayIndex(&index)) {
-    return JSObject::SetElement(js_object, index, value, attr, SLOPPY, false,
-                                DEFINE_PROPERTY);
-  } else {
-    return JSObject::SetOwnPropertyIgnoreAttributes(js_object, name, value,
-                                                    attr);
-  }
-}
-
-
-MaybeHandle<Object> Runtime::DeleteObjectProperty(Isolate* isolate,
-                                                  Handle<JSReceiver> receiver,
-                                                  Handle<Object> key,
-                                                  JSReceiver::DeleteMode mode) {
-  // Check if the given key is an array index.
-  uint32_t index;
-  if (key->ToArrayIndex(&index)) {
-    // In Firefox/SpiderMonkey, Safari and Opera you can access the
-    // characters of a string using [] notation.  In the case of a
-    // String object we just need to redirect the deletion to the
-    // underlying string if the index is in range.  Since the
-    // underlying string does nothing with the deletion, we can ignore
-    // such deletions.
-    if (receiver->IsStringObjectWithCharacterAt(index)) {
-      return isolate->factory()->true_value();
-    }
-
-    return JSReceiver::DeleteElement(receiver, index, mode);
-  }
-
-  Handle<Name> name;
-  if (key->IsName()) {
-    name = Handle<Name>::cast(key);
-  } else {
-    // Call-back into JavaScript to convert the key to a string.
-    Handle<Object> converted;
-    ASSIGN_RETURN_ON_EXCEPTION(isolate, converted,
-                               Execution::ToString(isolate, key), Object);
-    name = Handle<String>::cast(converted);
-  }
-
-  if (name->IsString()) name = String::Flatten(Handle<String>::cast(name));
-  return JSReceiver::DeleteProperty(receiver, name, mode);
-}
-
-
-RUNTIME_FUNCTION(Runtime_AddNamedProperty) {
-  HandleScope scope(isolate);
-  RUNTIME_ASSERT(args.length() == 4);
-
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
-  CONVERT_SMI_ARG_CHECKED(unchecked_attributes, 3);
-  RUNTIME_ASSERT(
-      (unchecked_attributes & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
-  // Compute attributes.
-  PropertyAttributes attributes =
-      static_cast<PropertyAttributes>(unchecked_attributes);
-
-#ifdef DEBUG
-  uint32_t index = 0;
-  DCHECK(!key->ToArrayIndex(&index));
-  LookupIterator it(object, key, LookupIterator::OWN_SKIP_INTERCEPTOR);
-  Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it);
-  if (!maybe.has_value) return isolate->heap()->exception();
-  RUNTIME_ASSERT(!it.IsFound());
-#endif
-
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result,
-      JSObject::SetOwnPropertyIgnoreAttributes(object, key, value, attributes));
-  return *result;
-}
-
-
-RUNTIME_FUNCTION(Runtime_AddPropertyForTemplate) {
-  HandleScope scope(isolate);
-  RUNTIME_ASSERT(args.length() == 4);
-
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
-  CONVERT_SMI_ARG_CHECKED(unchecked_attributes, 3);
-  RUNTIME_ASSERT(
-      (unchecked_attributes & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
-  // Compute attributes.
-  PropertyAttributes attributes =
-      static_cast<PropertyAttributes>(unchecked_attributes);
-
-#ifdef DEBUG
-  bool duplicate;
-  if (key->IsName()) {
-    LookupIterator it(object, Handle<Name>::cast(key),
-                      LookupIterator::OWN_SKIP_INTERCEPTOR);
-    Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it);
-    DCHECK(maybe.has_value);
-    duplicate = it.IsFound();
-  } else {
-    uint32_t index = 0;
-    RUNTIME_ASSERT(key->ToArrayIndex(&index));
-    Maybe<bool> maybe = JSReceiver::HasOwnElement(object, index);
-    if (!maybe.has_value) return isolate->heap()->exception();
-    duplicate = maybe.value;
-  }
-  if (duplicate) {
-    Handle<Object> args[1] = {key};
-    THROW_NEW_ERROR_RETURN_FAILURE(
-        isolate,
-        NewTypeError("duplicate_template_property", HandleVector(args, 1)));
-  }
-#endif
-
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result,
-      Runtime::DefineObjectProperty(object, key, value, attributes));
-  return *result;
-}
-
-
-RUNTIME_FUNCTION(Runtime_SetProperty) {
-  HandleScope scope(isolate);
-  RUNTIME_ASSERT(args.length() == 4);
-
-  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
-  CONVERT_STRICT_MODE_ARG_CHECKED(strict_mode_arg, 3);
-  StrictMode strict_mode = strict_mode_arg;
-
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result,
-      Runtime::SetObjectProperty(isolate, object, key, value, strict_mode));
-  return *result;
-}
-
-
-// Adds an element to an array.
-// This is used to create an indexed data property into an array.
-RUNTIME_FUNCTION(Runtime_AddElement) {
-  HandleScope scope(isolate);
-  RUNTIME_ASSERT(args.length() == 4);
-
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, value, 2);
-  CONVERT_SMI_ARG_CHECKED(unchecked_attributes, 3);
-  RUNTIME_ASSERT(
-      (unchecked_attributes & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
-  // Compute attributes.
-  PropertyAttributes attributes =
-      static_cast<PropertyAttributes>(unchecked_attributes);
-
-  uint32_t index = 0;
-  key->ToArrayIndex(&index);
-
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, JSObject::SetElement(object, index, value, attributes,
-                                            SLOPPY, false, DEFINE_PROPERTY));
-  return *result;
-}
-
-
-RUNTIME_FUNCTION(Runtime_TransitionElementsKind) {
-  HandleScope scope(isolate);
-  RUNTIME_ASSERT(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSArray, array, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Map, map, 1);
-  JSObject::TransitionElementsKind(array, map->elements_kind());
-  return *array;
-}
-
-
-RUNTIME_FUNCTION(Runtime_DeleteProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 3);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
-  CONVERT_STRICT_MODE_ARG_CHECKED(strict_mode, 2);
-  JSReceiver::DeleteMode delete_mode = strict_mode == STRICT
-                                           ? JSReceiver::STRICT_DELETION
-                                           : JSReceiver::NORMAL_DELETION;
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result, JSReceiver::DeleteProperty(object, key, delete_mode));
-  return *result;
-}
-
-
-static Object* HasOwnPropertyImplementation(Isolate* isolate,
-                                            Handle<JSObject> object,
-                                            Handle<Name> key) {
-  Maybe<bool> maybe = JSReceiver::HasOwnProperty(object, key);
-  if (!maybe.has_value) return isolate->heap()->exception();
-  if (maybe.value) return isolate->heap()->true_value();
-  // Handle hidden prototypes.  If there's a hidden prototype above this thing
-  // then we have to check it for properties, because they are supposed to
-  // look like they are on this object.
-  PrototypeIterator iter(isolate, object);
-  if (!iter.IsAtEnd() &&
-      Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter))
-          ->map()
-          ->is_hidden_prototype()) {
-    // TODO(verwaest): The recursion is not necessary for keys that are array
-    // indices. Removing this.
-    return HasOwnPropertyImplementation(
-        isolate, Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter)),
-        key);
-  }
-  RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
-  return isolate->heap()->false_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_HasOwnProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0)
-  CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
-
-  uint32_t index;
-  const bool key_is_array_index = key->AsArrayIndex(&index);
-
-  // Only JS objects can have properties.
-  if (object->IsJSObject()) {
-    Handle<JSObject> js_obj = Handle<JSObject>::cast(object);
-    // Fast case: either the key is a real named property or it is not
-    // an array index and there are no interceptors or hidden
-    // prototypes.
-    Maybe<bool> maybe = JSObject::HasRealNamedProperty(js_obj, key);
-    if (!maybe.has_value) return isolate->heap()->exception();
-    DCHECK(!isolate->has_pending_exception());
-    if (maybe.value) {
-      return isolate->heap()->true_value();
-    }
-    Map* map = js_obj->map();
-    if (!key_is_array_index && !map->has_named_interceptor() &&
-        !HeapObject::cast(map->prototype())->map()->is_hidden_prototype()) {
-      return isolate->heap()->false_value();
-    }
-    // Slow case.
-    return HasOwnPropertyImplementation(isolate, Handle<JSObject>(js_obj),
-                                        Handle<Name>(key));
-  } else if (object->IsString() && key_is_array_index) {
-    // Well, there is one exception:  Handle [] on strings.
-    Handle<String> string = Handle<String>::cast(object);
-    if (index < static_cast<uint32_t>(string->length())) {
-      return isolate->heap()->true_value();
-    }
-  }
-  return isolate->heap()->false_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_HasProperty) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
-
-  Maybe<bool> maybe = JSReceiver::HasProperty(receiver, key);
-  if (!maybe.has_value) return isolate->heap()->exception();
-  return isolate->heap()->ToBoolean(maybe.value);
-}
-
-
-RUNTIME_FUNCTION(Runtime_HasElement) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
-  CONVERT_SMI_ARG_CHECKED(index, 1);
-
-  Maybe<bool> maybe = JSReceiver::HasElement(receiver, index);
-  if (!maybe.has_value) return isolate->heap()->exception();
-  return isolate->heap()->ToBoolean(maybe.value);
-}
-
-
-RUNTIME_FUNCTION(Runtime_IsPropertyEnumerable) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, key, 1);
-
-  Maybe<PropertyAttributes> maybe =
-      JSReceiver::GetOwnPropertyAttributes(object, key);
-  if (!maybe.has_value) return isolate->heap()->exception();
-  if (maybe.value == ABSENT) maybe.value = DONT_ENUM;
-  return isolate->heap()->ToBoolean((maybe.value & DONT_ENUM) == 0);
-}
-
-
-RUNTIME_FUNCTION(Runtime_GetPropertyNames) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
-  Handle<JSArray> result;
-
-  isolate->counters()->for_in()->Increment();
-  Handle<FixedArray> elements;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, elements,
-      JSReceiver::GetKeys(object, JSReceiver::INCLUDE_PROTOS));
-  return *isolate->factory()->NewJSArrayWithElements(elements);
-}
-
-
-// Returns either a FixedArray as Runtime_GetPropertyNames,
-// or, if the given object has an enum cache that contains
-// all enumerable properties of the object and its prototypes
-// have none, the map of the object. This is used to speed up
-// the check for deletions during a for-in.
-RUNTIME_FUNCTION(Runtime_GetPropertyNamesFast) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-
-  CONVERT_ARG_CHECKED(JSReceiver, raw_object, 0);
-
-  if (raw_object->IsSimpleEnum()) return raw_object->map();
-
-  HandleScope scope(isolate);
-  Handle<JSReceiver> object(raw_object);
-  Handle<FixedArray> content;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, content,
-      JSReceiver::GetKeys(object, JSReceiver::INCLUDE_PROTOS));
-
-  // Test again, since cache may have been built by preceding call.
-  if (object->IsSimpleEnum()) return object->map();
-
-  return *content;
-}
-
-
-// Find the length of the prototype chain that is to be handled as one. If a
-// prototype object is hidden it is to be viewed as part of the the object it
-// is prototype for.
-static int OwnPrototypeChainLength(JSObject* obj) {
-  int count = 1;
-  for (PrototypeIterator iter(obj->GetIsolate(), obj);
-       !iter.IsAtEnd(PrototypeIterator::END_AT_NON_HIDDEN); iter.Advance()) {
-    count++;
-  }
-  return count;
-}
-
-
-// Return the names of the own named properties.
-// args[0]: object
-// args[1]: PropertyAttributes as int
-RUNTIME_FUNCTION(Runtime_GetOwnPropertyNames) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  if (!args[0]->IsJSObject()) {
-    return isolate->heap()->undefined_value();
-  }
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
-  CONVERT_SMI_ARG_CHECKED(filter_value, 1);
-  PropertyAttributes filter = static_cast<PropertyAttributes>(filter_value);
-
-  // Skip the global proxy as it has no properties and always delegates to the
-  // real global object.
-  if (obj->IsJSGlobalProxy()) {
-    // Only collect names if access is permitted.
-    if (obj->IsAccessCheckNeeded() &&
-        !isolate->MayNamedAccess(obj, isolate->factory()->undefined_value(),
-                                 v8::ACCESS_KEYS)) {
-      isolate->ReportFailedAccessCheck(obj, v8::ACCESS_KEYS);
-      RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
-      return *isolate->factory()->NewJSArray(0);
-    }
-    PrototypeIterator iter(isolate, obj);
-    obj = Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter));
-  }
-
-  // Find the number of objects making up this.
-  int length = OwnPrototypeChainLength(*obj);
-
-  // Find the number of own properties for each of the objects.
-  ScopedVector<int> own_property_count(length);
-  int total_property_count = 0;
-  {
-    PrototypeIterator iter(isolate, obj, PrototypeIterator::START_AT_RECEIVER);
-    for (int i = 0; i < length; i++) {
-      DCHECK(!iter.IsAtEnd());
-      Handle<JSObject> jsproto =
-          Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter));
-      // Only collect names if access is permitted.
-      if (jsproto->IsAccessCheckNeeded() &&
-          !isolate->MayNamedAccess(jsproto,
-                                   isolate->factory()->undefined_value(),
-                                   v8::ACCESS_KEYS)) {
-        isolate->ReportFailedAccessCheck(jsproto, v8::ACCESS_KEYS);
-        RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
-        return *isolate->factory()->NewJSArray(0);
-      }
-      int n;
-      n = jsproto->NumberOfOwnProperties(filter);
-      own_property_count[i] = n;
-      total_property_count += n;
-      iter.Advance();
-    }
-  }
-
-  // Allocate an array with storage for all the property names.
-  Handle<FixedArray> names =
-      isolate->factory()->NewFixedArray(total_property_count);
-
-  // Get the property names.
-  int next_copy_index = 0;
-  int hidden_strings = 0;
-  {
-    PrototypeIterator iter(isolate, obj, PrototypeIterator::START_AT_RECEIVER);
-    for (int i = 0; i < length; i++) {
-      DCHECK(!iter.IsAtEnd());
-      Handle<JSObject> jsproto =
-          Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter));
-      jsproto->GetOwnPropertyNames(*names, next_copy_index, filter);
-      if (i > 0) {
-        // Names from hidden prototypes may already have been added
-        // for inherited function template instances. Count the duplicates
-        // and stub them out; the final copy pass at the end ignores holes.
-        for (int j = next_copy_index;
-             j < next_copy_index + own_property_count[i]; j++) {
-          Object* name_from_hidden_proto = names->get(j);
-          for (int k = 0; k < next_copy_index; k++) {
-            if (names->get(k) != isolate->heap()->hidden_string()) {
-              Object* name = names->get(k);
-              if (name_from_hidden_proto == name) {
-                names->set(j, isolate->heap()->hidden_string());
-                hidden_strings++;
-                break;
-              }
-            }
-          }
-        }
-      }
-      next_copy_index += own_property_count[i];
-
-      // Hidden properties only show up if the filter does not skip strings.
-      if ((filter & STRING) == 0 && JSObject::HasHiddenProperties(jsproto)) {
-        hidden_strings++;
-      }
-      iter.Advance();
-    }
-  }
-
-  // Filter out name of hidden properties object and
-  // hidden prototype duplicates.
-  if (hidden_strings > 0) {
-    Handle<FixedArray> old_names = names;
-    names = isolate->factory()->NewFixedArray(names->length() - hidden_strings);
-    int dest_pos = 0;
-    for (int i = 0; i < total_property_count; i++) {
-      Object* name = old_names->get(i);
-      if (name == isolate->heap()->hidden_string()) {
-        hidden_strings--;
-        continue;
-      }
-      names->set(dest_pos++, name);
-    }
-    DCHECK_EQ(0, hidden_strings);
-  }
-
-  return *isolate->factory()->NewJSArrayWithElements(names);
-}
-
-
-// Return the names of the own indexed properties.
-// args[0]: object
-RUNTIME_FUNCTION(Runtime_GetOwnElementNames) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  if (!args[0]->IsJSObject()) {
-    return isolate->heap()->undefined_value();
-  }
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
-
-  int n = obj->NumberOfOwnElements(static_cast<PropertyAttributes>(NONE));
-  Handle<FixedArray> names = isolate->factory()->NewFixedArray(n);
-  obj->GetOwnElementKeys(*names, static_cast<PropertyAttributes>(NONE));
-  return *isolate->factory()->NewJSArrayWithElements(names);
-}
-
-
-// Return information on whether an object has a named or indexed interceptor.
-// args[0]: object
-RUNTIME_FUNCTION(Runtime_GetInterceptorInfo) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  if (!args[0]->IsJSObject()) {
-    return Smi::FromInt(0);
-  }
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
-
-  int result = 0;
-  if (obj->HasNamedInterceptor()) result |= 2;
-  if (obj->HasIndexedInterceptor()) result |= 1;
-
-  return Smi::FromInt(result);
-}
-
-
-// Return property names from named interceptor.
-// args[0]: object
-RUNTIME_FUNCTION(Runtime_GetNamedInterceptorPropertyNames) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
-
-  if (obj->HasNamedInterceptor()) {
-    Handle<JSObject> result;
-    if (JSObject::GetKeysForNamedInterceptor(obj, obj).ToHandle(&result)) {
-      return *result;
-    }
-  }
-  return isolate->heap()->undefined_value();
-}
-
-
-// Return element names from indexed interceptor.
-// args[0]: object
-RUNTIME_FUNCTION(Runtime_GetIndexedInterceptorElementNames) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
-
-  if (obj->HasIndexedInterceptor()) {
-    Handle<JSObject> result;
-    if (JSObject::GetKeysForIndexedInterceptor(obj, obj).ToHandle(&result)) {
-      return *result;
-    }
-  }
-  return isolate->heap()->undefined_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_OwnKeys) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(JSObject, raw_object, 0);
-  Handle<JSObject> object(raw_object);
-
-  if (object->IsJSGlobalProxy()) {
-    // Do access checks before going to the global object.
-    if (object->IsAccessCheckNeeded() &&
-        !isolate->MayNamedAccess(object, isolate->factory()->undefined_value(),
-                                 v8::ACCESS_KEYS)) {
-      isolate->ReportFailedAccessCheck(object, v8::ACCESS_KEYS);
-      RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
-      return *isolate->factory()->NewJSArray(0);
-    }
-
-    PrototypeIterator iter(isolate, object);
-    // If proxy is detached we simply return an empty array.
-    if (iter.IsAtEnd()) return *isolate->factory()->NewJSArray(0);
-    object = Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter));
-  }
-
-  Handle<FixedArray> contents;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, contents, JSReceiver::GetKeys(object, JSReceiver::OWN_ONLY));
-
-  // Some fast paths through GetKeysInFixedArrayFor reuse a cached
-  // property array and since the result is mutable we have to create
-  // a fresh clone on each invocation.
-  int length = contents->length();
-  Handle<FixedArray> copy = isolate->factory()->NewFixedArray(length);
-  for (int i = 0; i < length; i++) {
-    Object* entry = contents->get(i);
-    if (entry->IsString()) {
-      copy->set(i, entry);
-    } else {
-      DCHECK(entry->IsNumber());
-      HandleScope scope(isolate);
-      Handle<Object> entry_handle(entry, isolate);
-      Handle<Object> entry_str =
-          isolate->factory()->NumberToString(entry_handle);
-      copy->set(i, *entry_str);
-    }
-  }
-  return *isolate->factory()->NewJSArrayWithElements(copy);
-}
-
-
-RUNTIME_FUNCTION(Runtime_ToFastProperties) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
-  if (object->IsJSObject() && !object->IsGlobalObject()) {
-    JSObject::MigrateSlowToFast(Handle<JSObject>::cast(object), 0);
-  }
-  return *object;
-}
-
-
-RUNTIME_FUNCTION(Runtime_ToBool) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, object, 0);
-
-  return isolate->heap()->ToBoolean(object->BooleanValue());
-}
-
-
-// Returns the type string of a value; see ECMA-262, 11.4.3 (p 47).
-// Possible optimizations: put the type string into the oddballs.
-RUNTIME_FUNCTION(Runtime_Typeof) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  if (obj->IsNumber()) return isolate->heap()->number_string();
-  HeapObject* heap_obj = HeapObject::cast(obj);
-
-  // typeof an undetectable object is 'undefined'
-  if (heap_obj->map()->is_undetectable()) {
-    return isolate->heap()->undefined_string();
-  }
-
-  InstanceType instance_type = heap_obj->map()->instance_type();
-  if (instance_type < FIRST_NONSTRING_TYPE) {
-    return isolate->heap()->string_string();
-  }
-
-  switch (instance_type) {
-    case ODDBALL_TYPE:
-      if (heap_obj->IsTrue() || heap_obj->IsFalse()) {
-        return isolate->heap()->boolean_string();
-      }
-      if (heap_obj->IsNull()) {
-        return isolate->heap()->object_string();
-      }
-      DCHECK(heap_obj->IsUndefined());
-      return isolate->heap()->undefined_string();
-    case SYMBOL_TYPE:
-      return isolate->heap()->symbol_string();
-    case JS_FUNCTION_TYPE:
-    case JS_FUNCTION_PROXY_TYPE:
-      return isolate->heap()->function_string();
-    default:
-      // For any kind of object not handled above, the spec rule for
-      // host objects gives that it is okay to return "object"
-      return isolate->heap()->object_string();
-  }
-}
-
-
-RUNTIME_FUNCTION(Runtime_Booleanize) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_CHECKED(Object, value_raw, 0);
-  CONVERT_SMI_ARG_CHECKED(token_raw, 1);
-  intptr_t value = reinterpret_cast<intptr_t>(value_raw);
-  Token::Value token = static_cast<Token::Value>(token_raw);
-  switch (token) {
-    case Token::EQ:
-    case Token::EQ_STRICT:
-      return isolate->heap()->ToBoolean(value == 0);
-    case Token::NE:
-    case Token::NE_STRICT:
-      return isolate->heap()->ToBoolean(value != 0);
-    case Token::LT:
-      return isolate->heap()->ToBoolean(value < 0);
-    case Token::GT:
-      return isolate->heap()->ToBoolean(value > 0);
-    case Token::LTE:
-      return isolate->heap()->ToBoolean(value <= 0);
-    case Token::GTE:
-      return isolate->heap()->ToBoolean(value >= 0);
-    default:
-      // This should only happen during natives fuzzing.
-      return isolate->heap()->undefined_value();
-  }
-}
-
-
-RUNTIME_FUNCTION(Runtime_NewStringWrapper) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(String, value, 0);
-  return *Object::ToObject(isolate, value).ToHandleChecked();
-}
-
-
-RUNTIME_FUNCTION(Runtime_AllocateHeapNumber) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 0);
-  return *isolate->factory()->NewHeapNumber(0);
-}
-
-
-static Object* Runtime_NewObjectHelper(Isolate* isolate,
-                                       Handle<Object> constructor,
-                                       Handle<AllocationSite> site) {
-  // If the constructor isn't a proper function we throw a type error.
-  if (!constructor->IsJSFunction()) {
-    Vector<Handle<Object> > arguments = HandleVector(&constructor, 1);
-    THROW_NEW_ERROR_RETURN_FAILURE(isolate,
-                                   NewTypeError("not_constructor", arguments));
-  }
-
-  Handle<JSFunction> function = Handle<JSFunction>::cast(constructor);
-
-  // If function should not have prototype, construction is not allowed. In this
-  // case generated code bailouts here, since function has no initial_map.
-  if (!function->should_have_prototype() && !function->shared()->bound()) {
-    Vector<Handle<Object> > arguments = HandleVector(&constructor, 1);
-    THROW_NEW_ERROR_RETURN_FAILURE(isolate,
-                                   NewTypeError("not_constructor", arguments));
-  }
-
-  Debug* debug = isolate->debug();
-  // Handle stepping into constructors if step into is active.
-  if (debug->StepInActive()) {
-    debug->HandleStepIn(function, Handle<Object>::null(), 0, true);
-  }
-
-  if (function->has_initial_map()) {
-    if (function->initial_map()->instance_type() == JS_FUNCTION_TYPE) {
-      // The 'Function' function ignores the receiver object when
-      // called using 'new' and creates a new JSFunction object that
-      // is returned.  The receiver object is only used for error
-      // reporting if an error occurs when constructing the new
-      // JSFunction. Factory::NewJSObject() should not be used to
-      // allocate JSFunctions since it does not properly initialize
-      // the shared part of the function. Since the receiver is
-      // ignored anyway, we use the global object as the receiver
-      // instead of a new JSFunction object. This way, errors are
-      // reported the same way whether or not 'Function' is called
-      // using 'new'.
-      return isolate->global_proxy();
-    }
-  }
-
-  // The function should be compiled for the optimization hints to be
-  // available.
-  Compiler::EnsureCompiled(function, CLEAR_EXCEPTION);
-
-  Handle<JSObject> result;
-  if (site.is_null()) {
-    result = isolate->factory()->NewJSObject(function);
-  } else {
-    result = isolate->factory()->NewJSObjectWithMemento(function, site);
-  }
-
-  isolate->counters()->constructed_objects()->Increment();
-  isolate->counters()->constructed_objects_runtime()->Increment();
-
-  return *result;
-}
-
-
-RUNTIME_FUNCTION(Runtime_NewObject) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, constructor, 0);
-  return Runtime_NewObjectHelper(isolate, constructor,
-                                 Handle<AllocationSite>::null());
-}
-
-
-RUNTIME_FUNCTION(Runtime_NewObjectWithAllocationSite) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(Object, constructor, 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, feedback, 0);
-  Handle<AllocationSite> site;
-  if (feedback->IsAllocationSite()) {
-    // The feedback can be an AllocationSite or undefined.
-    site = Handle<AllocationSite>::cast(feedback);
-  }
-  return Runtime_NewObjectHelper(isolate, constructor, site);
-}
-
-
-RUNTIME_FUNCTION(Runtime_FinalizeInstanceSize) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-
-  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
-  function->CompleteInobjectSlackTracking();
-
-  return isolate->heap()->undefined_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_CheckIsBootstrapping) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 0);
-  RUNTIME_ASSERT(isolate->bootstrapper()->IsActive());
-  return isolate->heap()->undefined_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_GetRootNaN) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 0);
-  RUNTIME_ASSERT(isolate->bootstrapper()->IsActive());
-  return isolate->heap()->nan_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_Throw) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-
-  return isolate->Throw(args[0]);
-}
-
-
-RUNTIME_FUNCTION(Runtime_ReThrow) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-
-  return isolate->ReThrow(args[0]);
-}
-
-
-RUNTIME_FUNCTION(Runtime_PromoteScheduledException) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 0);
-  return isolate->PromoteScheduledException();
-}
-
-
-RUNTIME_FUNCTION(Runtime_ThrowReferenceError) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, name, 0);
-  THROW_NEW_ERROR_RETURN_FAILURE(
-      isolate, NewReferenceError("not_defined", HandleVector(&name, 1)));
-}
-
-
-RUNTIME_FUNCTION(Runtime_PromiseRejectEvent) {
-  DCHECK(args.length() == 3);
-  HandleScope scope(isolate);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
-  CONVERT_BOOLEAN_ARG_CHECKED(debug_event, 2);
-  if (debug_event) isolate->debug()->OnPromiseReject(promise, value);
-  Handle<Symbol> key = isolate->factory()->promise_has_handler_symbol();
-  // Do not report if we actually have a handler.
-  if (JSObject::GetDataProperty(promise, key)->IsUndefined()) {
-    isolate->ReportPromiseReject(promise, value,
-                                 v8::kPromiseRejectWithNoHandler);
-  }
-  return isolate->heap()->undefined_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_PromiseRevokeReject) {
-  DCHECK(args.length() == 1);
-  HandleScope scope(isolate);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
-  Handle<Symbol> key = isolate->factory()->promise_has_handler_symbol();
-  // At this point, no revocation has been issued before
-  RUNTIME_ASSERT(JSObject::GetDataProperty(promise, key)->IsUndefined());
-  isolate->ReportPromiseReject(promise, Handle<Object>(),
-                               v8::kPromiseHandlerAddedAfterReject);
-  return isolate->heap()->undefined_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_PromiseHasHandlerSymbol) {
-  DCHECK(args.length() == 0);
-  return isolate->heap()->promise_has_handler_symbol();
-}
-
-
-RUNTIME_FUNCTION(Runtime_StackGuard) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 0);
-
-  // First check if this is a real stack overflow.
-  StackLimitCheck check(isolate);
-  if (check.JsHasOverflowed()) {
-    return isolate->StackOverflow();
-  }
-
-  return isolate->stack_guard()->HandleInterrupts();
-}
-
-
-RUNTIME_FUNCTION(Runtime_Interrupt) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 0);
-  return isolate->stack_guard()->HandleInterrupts();
-}
-
-
-RUNTIME_FUNCTION(Runtime_GlobalProxy) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, global, 0);
-  if (!global->IsJSGlobalObject()) return isolate->heap()->null_value();
-  return JSGlobalObject::cast(global)->global_proxy();
-}
-
-
-RUNTIME_FUNCTION(Runtime_IsAttachedGlobal) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, global, 0);
-  if (!global->IsJSGlobalObject()) return isolate->heap()->false_value();
-  return isolate->heap()->ToBoolean(
-      !JSGlobalObject::cast(global)->IsDetached());
-}
-
-
-RUNTIME_FUNCTION(Runtime_AllocateInNewSpace) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_SMI_ARG_CHECKED(size, 0);
-  RUNTIME_ASSERT(IsAligned(size, kPointerSize));
-  RUNTIME_ASSERT(size > 0);
-  RUNTIME_ASSERT(size <= Page::kMaxRegularHeapObjectSize);
-  return *isolate->factory()->NewFillerObject(size, false, NEW_SPACE);
-}
-
-
-RUNTIME_FUNCTION(Runtime_AllocateInTargetSpace) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_SMI_ARG_CHECKED(size, 0);
-  CONVERT_SMI_ARG_CHECKED(flags, 1);
-  RUNTIME_ASSERT(IsAligned(size, kPointerSize));
-  RUNTIME_ASSERT(size > 0);
-  RUNTIME_ASSERT(size <= Page::kMaxRegularHeapObjectSize);
-  bool double_align = AllocateDoubleAlignFlag::decode(flags);
-  AllocationSpace space = AllocateTargetSpace::decode(flags);
-  return *isolate->factory()->NewFillerObject(size, double_align, space);
-}
-
-
-// Push an object unto an array of objects if it is not already in the
-// array.  Returns true if the element was pushed on the stack and
-// false otherwise.
-RUNTIME_FUNCTION(Runtime_PushIfAbsent) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSArray, array, 0);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, element, 1);
-  RUNTIME_ASSERT(array->HasFastSmiOrObjectElements());
-  int length = Smi::cast(array->length())->value();
-  FixedArray* elements = FixedArray::cast(array->elements());
-  for (int i = 0; i < length; i++) {
-    if (elements->get(i) == *element) return isolate->heap()->false_value();
-  }
-
-  // Strict not needed. Used for cycle detection in Array join implementation.
-  RETURN_FAILURE_ON_EXCEPTION(
-      isolate, JSObject::SetFastElement(array, length, element, SLOPPY, true));
-  return isolate->heap()->true_value();
-}
-
-
-/**
- * A simple visitor visits every element of Array's.
- * The backend storage can be a fixed array for fast elements case,
- * or a dictionary for sparse array. Since Dictionary is a subtype
- * of FixedArray, the class can be used by both fast and slow cases.
- * The second parameter of the constructor, fast_elements, specifies
- * whether the storage is a FixedArray or Dictionary.
- *
- * An index limit is used to deal with the situation that a result array
- * length overflows 32-bit non-negative integer.
- */
-class ArrayConcatVisitor {
- public:
-  ArrayConcatVisitor(Isolate* isolate, Handle<FixedArray> storage,
-                     bool fast_elements)
-      : isolate_(isolate),
-        storage_(Handle<FixedArray>::cast(
-            isolate->global_handles()->Create(*storage))),
-        index_offset_(0u),
-        fast_elements_(fast_elements),
-        exceeds_array_limit_(false) {}
-
-  ~ArrayConcatVisitor() { clear_storage(); }
-
-  void visit(uint32_t i, Handle<Object> elm) {
-    if (i > JSObject::kMaxElementCount - index_offset_) {
-      exceeds_array_limit_ = true;
-      return;
-    }
-    uint32_t index = index_offset_ + i;
-
-    if (fast_elements_) {
-      if (index < static_cast<uint32_t>(storage_->length())) {
-        storage_->set(index, *elm);
-        return;
-      }
-      // Our initial estimate of length was foiled, possibly by
-      // getters on the arrays increasing the length of later arrays
-      // during iteration.
-      // This shouldn't happen in anything but pathological cases.
-      SetDictionaryMode();
-      // Fall-through to dictionary mode.
-    }
-    DCHECK(!fast_elements_);
-    Handle<SeededNumberDictionary> dict(
-        SeededNumberDictionary::cast(*storage_));
-    Handle<SeededNumberDictionary> result =
-        SeededNumberDictionary::AtNumberPut(dict, index, elm);
-    if (!result.is_identical_to(dict)) {
-      // Dictionary needed to grow.
-      clear_storage();
-      set_storage(*result);
-    }
-  }
-
-  void increase_index_offset(uint32_t delta) {
-    if (JSObject::kMaxElementCount - index_offset_ < delta) {
-      index_offset_ = JSObject::kMaxElementCount;
-    } else {
-      index_offset_ += delta;
-    }
-    // If the initial length estimate was off (see special case in visit()),
-    // but the array blowing the limit didn't contain elements beyond the
-    // provided-for index range, go to dictionary mode now.
-    if (fast_elements_ &&
-        index_offset_ >
-            static_cast<uint32_t>(FixedArrayBase::cast(*storage_)->length())) {
-      SetDictionaryMode();
-    }
-  }
-
-  bool exceeds_array_limit() { return exceeds_array_limit_; }
-
-  Handle<JSArray> ToArray() {
-    Handle<JSArray> array = isolate_->factory()->NewJSArray(0);
-    Handle<Object> length =
-        isolate_->factory()->NewNumber(static_cast<double>(index_offset_));
-    Handle<Map> map = JSObject::GetElementsTransitionMap(
-        array, fast_elements_ ? FAST_HOLEY_ELEMENTS : DICTIONARY_ELEMENTS);
-    array->set_map(*map);
-    array->set_length(*length);
-    array->set_elements(*storage_);
-    return array;
-  }
-
- private:
-  // Convert storage to dictionary mode.
-  void SetDictionaryMode() {
-    DCHECK(fast_elements_);
-    Handle<FixedArray> current_storage(*storage_);
-    Handle<SeededNumberDictionary> slow_storage(
-        SeededNumberDictionary::New(isolate_, current_storage->length()));
-    uint32_t current_length = static_cast<uint32_t>(current_storage->length());
-    for (uint32_t i = 0; i < current_length; i++) {
-      HandleScope loop_scope(isolate_);
-      Handle<Object> element(current_storage->get(i), isolate_);
-      if (!element->IsTheHole()) {
-        Handle<SeededNumberDictionary> new_storage =
-            SeededNumberDictionary::AtNumberPut(slow_storage, i, element);
-        if (!new_storage.is_identical_to(slow_storage)) {
-          slow_storage = loop_scope.CloseAndEscape(new_storage);
-        }
-      }
-    }
-    clear_storage();
-    set_storage(*slow_storage);
-    fast_elements_ = false;
-  }
-
-  inline void clear_storage() {
-    GlobalHandles::Destroy(Handle<Object>::cast(storage_).location());
-  }
-
-  inline void set_storage(FixedArray* storage) {
-    storage_ =
-        Handle<FixedArray>::cast(isolate_->global_handles()->Create(storage));
-  }
-
-  Isolate* isolate_;
-  Handle<FixedArray> storage_;  // Always a global handle.
-  // Index after last seen index. Always less than or equal to
-  // JSObject::kMaxElementCount.
-  uint32_t index_offset_;
-  bool fast_elements_ : 1;
-  bool exceeds_array_limit_ : 1;
-};
-
-
-static uint32_t EstimateElementCount(Handle<JSArray> array) {
-  uint32_t length = static_cast<uint32_t>(array->length()->Number());
-  int element_count = 0;
-  switch (array->GetElementsKind()) {
-    case FAST_SMI_ELEMENTS:
-    case FAST_HOLEY_SMI_ELEMENTS:
-    case FAST_ELEMENTS:
-    case FAST_HOLEY_ELEMENTS: {
-      // Fast elements can't have lengths that are not representable by
-      // a 32-bit signed integer.
-      DCHECK(static_cast<int32_t>(FixedArray::kMaxLength) >= 0);
-      int fast_length = static_cast<int>(length);
-      Handle<FixedArray> elements(FixedArray::cast(array->elements()));
-      for (int i = 0; i < fast_length; i++) {
-        if (!elements->get(i)->IsTheHole()) element_count++;
-      }
-      break;
-    }
-    case FAST_DOUBLE_ELEMENTS:
-    case FAST_HOLEY_DOUBLE_ELEMENTS: {
-      // Fast elements can't have lengths that are not representable by
-      // a 32-bit signed integer.
-      DCHECK(static_cast<int32_t>(FixedDoubleArray::kMaxLength) >= 0);
-      int fast_length = static_cast<int>(length);
-      if (array->elements()->IsFixedArray()) {
-        DCHECK(FixedArray::cast(array->elements())->length() == 0);
-        break;
-      }
-      Handle<FixedDoubleArray> elements(
-          FixedDoubleArray::cast(array->elements()));
-      for (int i = 0; i < fast_length; i++) {
-        if (!elements->is_the_hole(i)) element_count++;
-      }
-      break;
-    }
-    case DICTIONARY_ELEMENTS: {
-      Handle<SeededNumberDictionary> dictionary(
-          SeededNumberDictionary::cast(array->elements()));
-      int capacity = dictionary->Capacity();
-      for (int i = 0; i < capacity; i++) {
-        Handle<Object> key(dictionary->KeyAt(i), array->GetIsolate());
-        if (dictionary->IsKey(*key)) {
-          element_count++;
-        }
-      }
-      break;
-    }
-    case SLOPPY_ARGUMENTS_ELEMENTS:
-#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
-  case EXTERNAL_##TYPE##_ELEMENTS:                      \
-  case TYPE##_ELEMENTS:
-
-      TYPED_ARRAYS(TYPED_ARRAY_CASE)
-#undef TYPED_ARRAY_CASE
-      // External arrays are always dense.
-      return length;
-  }
-  // As an estimate, we assume that the prototype doesn't contain any
-  // inherited elements.
-  return element_count;
-}
-
-
-template <class ExternalArrayClass, class ElementType>
-static void IterateExternalArrayElements(Isolate* isolate,
-                                         Handle<JSObject> receiver,
-                                         bool elements_are_ints,
-                                         bool elements_are_guaranteed_smis,
-                                         ArrayConcatVisitor* visitor) {
-  Handle<ExternalArrayClass> array(
-      ExternalArrayClass::cast(receiver->elements()));
-  uint32_t len = static_cast<uint32_t>(array->length());
-
-  DCHECK(visitor != NULL);
-  if (elements_are_ints) {
-    if (elements_are_guaranteed_smis) {
-      for (uint32_t j = 0; j < len; j++) {
-        HandleScope loop_scope(isolate);
-        Handle<Smi> e(Smi::FromInt(static_cast<int>(array->get_scalar(j))),
-                      isolate);
-        visitor->visit(j, e);
-      }
-    } else {
-      for (uint32_t j = 0; j < len; j++) {
-        HandleScope loop_scope(isolate);
-        int64_t val = static_cast<int64_t>(array->get_scalar(j));
-        if (Smi::IsValid(static_cast<intptr_t>(val))) {
-          Handle<Smi> e(Smi::FromInt(static_cast<int>(val)), isolate);
-          visitor->visit(j, e);
-        } else {
-          Handle<Object> e =
-              isolate->factory()->NewNumber(static_cast<ElementType>(val));
-          visitor->visit(j, e);
-        }
-      }
-    }
-  } else {
-    for (uint32_t j = 0; j < len; j++) {
-      HandleScope loop_scope(isolate);
-      Handle<Object> e = isolate->factory()->NewNumber(array->get_scalar(j));
-      visitor->visit(j, e);
-    }
-  }
-}
-
-
-// Used for sorting indices in a List<uint32_t>.
-static int compareUInt32(const uint32_t* ap, const uint32_t* bp) {
-  uint32_t a = *ap;
-  uint32_t b = *bp;
-  return (a == b) ? 0 : (a < b) ? -1 : 1;
-}
-
-
-static void CollectElementIndices(Handle<JSObject> object, uint32_t range,
-                                  List<uint32_t>* indices) {
-  Isolate* isolate = object->GetIsolate();
-  ElementsKind kind = object->GetElementsKind();
-  switch (kind) {
-    case FAST_SMI_ELEMENTS:
-    case FAST_ELEMENTS:
-    case FAST_HOLEY_SMI_ELEMENTS:
-    case FAST_HOLEY_ELEMENTS: {
-      Handle<FixedArray> elements(FixedArray::cast(object->elements()));
-      uint32_t length = static_cast<uint32_t>(elements->length());
-      if (range < length) length = range;
-      for (uint32_t i = 0; i < length; i++) {
-        if (!elements->get(i)->IsTheHole()) {
-          indices->Add(i);
-        }
-      }
-      break;
-    }
-    case FAST_HOLEY_DOUBLE_ELEMENTS:
-    case FAST_DOUBLE_ELEMENTS: {
-      if (object->elements()->IsFixedArray()) {
-        DCHECK(object->elements()->length() == 0);
-        break;
-      }
-      Handle<FixedDoubleArray> elements(
-          FixedDoubleArray::cast(object->elements()));
-      uint32_t length = static_cast<uint32_t>(elements->length());
-      if (range < length) length = range;
-      for (uint32_t i = 0; i < length; i++) {
-        if (!elements->is_the_hole(i)) {
-          indices->Add(i);
-        }
-      }
-      break;
-    }
-    case DICTIONARY_ELEMENTS: {
-      Handle<SeededNumberDictionary> dict(
-          SeededNumberDictionary::cast(object->elements()));
-      uint32_t capacity = dict->Capacity();
-      for (uint32_t j = 0; j < capacity; j++) {
-        HandleScope loop_scope(isolate);
-        Handle<Object> k(dict->KeyAt(j), isolate);
-        if (dict->IsKey(*k)) {
-          DCHECK(k->IsNumber());
-          uint32_t index = static_cast<uint32_t>(k->Number());
-          if (index < range) {
-            indices->Add(index);
-          }
-        }
-      }
-      break;
-    }
-#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
-  case TYPE##_ELEMENTS:                                 \
-  case EXTERNAL_##TYPE##_ELEMENTS:
-
-      TYPED_ARRAYS(TYPED_ARRAY_CASE)
-#undef TYPED_ARRAY_CASE
-      {
-        uint32_t length = static_cast<uint32_t>(
-            FixedArrayBase::cast(object->elements())->length());
-        if (range <= length) {
-          length = range;
-          // We will add all indices, so we might as well clear it first
-          // and avoid duplicates.
-          indices->Clear();
-        }
-        for (uint32_t i = 0; i < length; i++) {
-          indices->Add(i);
-        }
-        if (length == range) return;  // All indices accounted for already.
-        break;
-      }
-    case SLOPPY_ARGUMENTS_ELEMENTS: {
-      MaybeHandle<Object> length_obj =
-          Object::GetProperty(object, isolate->factory()->length_string());
-      double length_num = length_obj.ToHandleChecked()->Number();
-      uint32_t length = static_cast<uint32_t>(DoubleToInt32(length_num));
-      ElementsAccessor* accessor = object->GetElementsAccessor();
-      for (uint32_t i = 0; i < length; i++) {
-        if (accessor->HasElement(object, object, i)) {
-          indices->Add(i);
-        }
-      }
-      break;
-    }
-  }
-
-  PrototypeIterator iter(isolate, object);
-  if (!iter.IsAtEnd()) {
-    // The prototype will usually have no inherited element indices,
-    // but we have to check.
-    CollectElementIndices(
-        Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter)), range,
-        indices);
-  }
-}
-
-
-/**
- * A helper function that visits elements of a JSArray in numerical
- * order.
- *
- * The visitor argument called for each existing element in the array
- * with the element index and the element's value.
- * Afterwards it increments the base-index of the visitor by the array
- * length.
- * Returns false if any access threw an exception, otherwise true.
- */
-static bool IterateElements(Isolate* isolate, Handle<JSArray> receiver,
-                            ArrayConcatVisitor* visitor) {
-  uint32_t length = static_cast<uint32_t>(receiver->length()->Number());
-  switch (receiver->GetElementsKind()) {
-    case FAST_SMI_ELEMENTS:
-    case FAST_ELEMENTS:
-    case FAST_HOLEY_SMI_ELEMENTS:
-    case FAST_HOLEY_ELEMENTS: {
-      // Run through the elements FixedArray and use HasElement and GetElement
-      // to check the prototype for missing elements.
-      Handle<FixedArray> elements(FixedArray::cast(receiver->elements()));
-      int fast_length = static_cast<int>(length);
-      DCHECK(fast_length <= elements->length());
-      for (int j = 0; j < fast_length; j++) {
-        HandleScope loop_scope(isolate);
-        Handle<Object> element_value(elements->get(j), isolate);
-        if (!element_value->IsTheHole()) {
-          visitor->visit(j, element_value);
-        } else {
-          Maybe<bool> maybe = JSReceiver::HasElement(receiver, j);
-          if (!maybe.has_value) return false;
-          if (maybe.value) {
-            // Call GetElement on receiver, not its prototype, or getters won't
-            // have the correct receiver.
-            ASSIGN_RETURN_ON_EXCEPTION_VALUE(
-                isolate, element_value,
-                Object::GetElement(isolate, receiver, j), false);
-            visitor->visit(j, element_value);
-          }
-        }
-      }
-      break;
-    }
-    case FAST_HOLEY_DOUBLE_ELEMENTS:
-    case FAST_DOUBLE_ELEMENTS: {
-      // Empty array is FixedArray but not FixedDoubleArray.
-      if (length == 0) break;
-      // Run through the elements FixedArray and use HasElement and GetElement
-      // to check the prototype for missing elements.
-      if (receiver->elements()->IsFixedArray()) {
-        DCHECK(receiver->elements()->length() == 0);
-        break;
-      }
-      Handle<FixedDoubleArray> elements(
-          FixedDoubleArray::cast(receiver->elements()));
-      int fast_length = static_cast<int>(length);
-      DCHECK(fast_length <= elements->length());
-      for (int j = 0; j < fast_length; j++) {
-        HandleScope loop_scope(isolate);
-        if (!elements->is_the_hole(j)) {
-          double double_value = elements->get_scalar(j);
-          Handle<Object> element_value =
-              isolate->factory()->NewNumber(double_value);
-          visitor->visit(j, element_value);
-        } else {
-          Maybe<bool> maybe = JSReceiver::HasElement(receiver, j);
-          if (!maybe.has_value) return false;
-          if (maybe.value) {
-            // Call GetElement on receiver, not its prototype, or getters won't
-            // have the correct receiver.
-            Handle<Object> element_value;
-            ASSIGN_RETURN_ON_EXCEPTION_VALUE(
-                isolate, element_value,
-                Object::GetElement(isolate, receiver, j), false);
-            visitor->visit(j, element_value);
-          }
-        }
-      }
-      break;
-    }
-    case DICTIONARY_ELEMENTS: {
-      Handle<SeededNumberDictionary> dict(receiver->element_dictionary());
-      List<uint32_t> indices(dict->Capacity() / 2);
-      // Collect all indices in the object and the prototypes less
-      // than length. This might introduce duplicates in the indices list.
-      CollectElementIndices(receiver, length, &indices);
-      indices.Sort(&compareUInt32);
-      int j = 0;
-      int n = indices.length();
-      while (j < n) {
-        HandleScope loop_scope(isolate);
-        uint32_t index = indices[j];
-        Handle<Object> element;
-        ASSIGN_RETURN_ON_EXCEPTION_VALUE(
-            isolate, element, Object::GetElement(isolate, receiver, index),
-            false);
-        visitor->visit(index, element);
-        // Skip to next different index (i.e., omit duplicates).
-        do {
-          j++;
-        } while (j < n && indices[j] == index);
-      }
-      break;
-    }
-    case EXTERNAL_UINT8_CLAMPED_ELEMENTS: {
-      Handle<ExternalUint8ClampedArray> pixels(
-          ExternalUint8ClampedArray::cast(receiver->elements()));
-      for (uint32_t j = 0; j < length; j++) {
-        Handle<Smi> e(Smi::FromInt(pixels->get_scalar(j)), isolate);
-        visitor->visit(j, e);
-      }
-      break;
-    }
-    case EXTERNAL_INT8_ELEMENTS: {
-      IterateExternalArrayElements<ExternalInt8Array, int8_t>(
-          isolate, receiver, true, true, visitor);
-      break;
-    }
-    case EXTERNAL_UINT8_ELEMENTS: {
-      IterateExternalArrayElements<ExternalUint8Array, uint8_t>(
-          isolate, receiver, true, true, visitor);
-      break;
-    }
-    case EXTERNAL_INT16_ELEMENTS: {
-      IterateExternalArrayElements<ExternalInt16Array, int16_t>(
-          isolate, receiver, true, true, visitor);
-      break;
-    }
-    case EXTERNAL_UINT16_ELEMENTS: {
-      IterateExternalArrayElements<ExternalUint16Array, uint16_t>(
-          isolate, receiver, true, true, visitor);
-      break;
-    }
-    case EXTERNAL_INT32_ELEMENTS: {
-      IterateExternalArrayElements<ExternalInt32Array, int32_t>(
-          isolate, receiver, true, false, visitor);
-      break;
-    }
-    case EXTERNAL_UINT32_ELEMENTS: {
-      IterateExternalArrayElements<ExternalUint32Array, uint32_t>(
-          isolate, receiver, true, false, visitor);
-      break;
-    }
-    case EXTERNAL_FLOAT32_ELEMENTS: {
-      IterateExternalArrayElements<ExternalFloat32Array, float>(
-          isolate, receiver, false, false, visitor);
-      break;
-    }
-    case EXTERNAL_FLOAT64_ELEMENTS: {
-      IterateExternalArrayElements<ExternalFloat64Array, double>(
-          isolate, receiver, false, false, visitor);
-      break;
-    }
-    default:
-      UNREACHABLE();
-      break;
-  }
-  visitor->increase_index_offset(length);
-  return true;
-}
-
-
-/**
- * Array::concat implementation.
- * See ECMAScript 262, 15.4.4.4.
- * TODO(581): Fix non-compliance for very large concatenations and update to
- * following the ECMAScript 5 specification.
- */
-RUNTIME_FUNCTION(Runtime_ArrayConcat) {
-  HandleScope handle_scope(isolate);
-  DCHECK(args.length() == 1);
-
-  CONVERT_ARG_HANDLE_CHECKED(JSArray, arguments, 0);
-  int argument_count = static_cast<int>(arguments->length()->Number());
-  RUNTIME_ASSERT(arguments->HasFastObjectElements());
-  Handle<FixedArray> elements(FixedArray::cast(arguments->elements()));
-
-  // Pass 1: estimate the length and number of elements of the result.
-  // The actual length can be larger if any of the arguments have getters
-  // that mutate other arguments (but will otherwise be precise).
-  // The number of elements is precise if there are no inherited elements.
-
-  ElementsKind kind = FAST_SMI_ELEMENTS;
-
-  uint32_t estimate_result_length = 0;
-  uint32_t estimate_nof_elements = 0;
-  for (int i = 0; i < argument_count; i++) {
-    HandleScope loop_scope(isolate);
-    Handle<Object> obj(elements->get(i), isolate);
-    uint32_t length_estimate;
-    uint32_t element_estimate;
-    if (obj->IsJSArray()) {
-      Handle<JSArray> array(Handle<JSArray>::cast(obj));
-      length_estimate = static_cast<uint32_t>(array->length()->Number());
-      if (length_estimate != 0) {
-        ElementsKind array_kind =
-            GetPackedElementsKind(array->map()->elements_kind());
-        if (IsMoreGeneralElementsKindTransition(kind, array_kind)) {
-          kind = array_kind;
-        }
-      }
-      element_estimate = EstimateElementCount(array);
-    } else {
-      if (obj->IsHeapObject()) {
-        if (obj->IsNumber()) {
-          if (IsMoreGeneralElementsKindTransition(kind, FAST_DOUBLE_ELEMENTS)) {
-            kind = FAST_DOUBLE_ELEMENTS;
-          }
-        } else if (IsMoreGeneralElementsKindTransition(kind, FAST_ELEMENTS)) {
-          kind = FAST_ELEMENTS;
-        }
-      }
-      length_estimate = 1;
-      element_estimate = 1;
-    }
-    // Avoid overflows by capping at kMaxElementCount.
-    if (JSObject::kMaxElementCount - estimate_result_length < length_estimate) {
-      estimate_result_length = JSObject::kMaxElementCount;
-    } else {
-      estimate_result_length += length_estimate;
-    }
-    if (JSObject::kMaxElementCount - estimate_nof_elements < element_estimate) {
-      estimate_nof_elements = JSObject::kMaxElementCount;
-    } else {
-      estimate_nof_elements += element_estimate;
-    }
-  }
-
-  // If estimated number of elements is more than half of length, a
-  // fixed array (fast case) is more time and space-efficient than a
-  // dictionary.
-  bool fast_case = (estimate_nof_elements * 2) >= estimate_result_length;
-
-  if (fast_case && kind == FAST_DOUBLE_ELEMENTS) {
-    Handle<FixedArrayBase> storage =
-        isolate->factory()->NewFixedDoubleArray(estimate_result_length);
-    int j = 0;
-    bool failure = false;
-    if (estimate_result_length > 0) {
-      Handle<FixedDoubleArray> double_storage =
-          Handle<FixedDoubleArray>::cast(storage);
-      for (int i = 0; i < argument_count; i++) {
-        Handle<Object> obj(elements->get(i), isolate);
-        if (obj->IsSmi()) {
-          double_storage->set(j, Smi::cast(*obj)->value());
-          j++;
-        } else if (obj->IsNumber()) {
-          double_storage->set(j, obj->Number());
-          j++;
-        } else {
-          JSArray* array = JSArray::cast(*obj);
-          uint32_t length = static_cast<uint32_t>(array->length()->Number());
-          switch (array->map()->elements_kind()) {
-            case FAST_HOLEY_DOUBLE_ELEMENTS:
-            case FAST_DOUBLE_ELEMENTS: {
-              // Empty array is FixedArray but not FixedDoubleArray.
-              if (length == 0) break;
-              FixedDoubleArray* elements =
-                  FixedDoubleArray::cast(array->elements());
-              for (uint32_t i = 0; i < length; i++) {
-                if (elements->is_the_hole(i)) {
-                  // TODO(jkummerow/verwaest): We could be a bit more clever
-                  // here: Check if there are no elements/getters on the
-                  // prototype chain, and if so, allow creation of a holey
-                  // result array.
-                  // Same thing below (holey smi case).
-                  failure = true;
-                  break;
-                }
-                double double_value = elements->get_scalar(i);
-                double_storage->set(j, double_value);
-                j++;
-              }
-              break;
-            }
-            case FAST_HOLEY_SMI_ELEMENTS:
-            case FAST_SMI_ELEMENTS: {
-              FixedArray* elements(FixedArray::cast(array->elements()));
-              for (uint32_t i = 0; i < length; i++) {
-                Object* element = elements->get(i);
-                if (element->IsTheHole()) {
-                  failure = true;
-                  break;
-                }
-                int32_t int_value = Smi::cast(element)->value();
-                double_storage->set(j, int_value);
-                j++;
-              }
-              break;
-            }
-            case FAST_HOLEY_ELEMENTS:
-            case FAST_ELEMENTS:
-              DCHECK_EQ(0, length);
-              break;
-            default:
-              UNREACHABLE();
-          }
-        }
-        if (failure) break;
-      }
-    }
-    if (!failure) {
-      Handle<JSArray> array = isolate->factory()->NewJSArray(0);
-      Smi* length = Smi::FromInt(j);
-      Handle<Map> map;
-      map = JSObject::GetElementsTransitionMap(array, kind);
-      array->set_map(*map);
-      array->set_length(length);
-      array->set_elements(*storage);
-      return *array;
-    }
-    // In case of failure, fall through.
-  }
-
-  Handle<FixedArray> storage;
-  if (fast_case) {
-    // The backing storage array must have non-existing elements to preserve
-    // holes across concat operations.
-    storage =
-        isolate->factory()->NewFixedArrayWithHoles(estimate_result_length);
-  } else {
-    // TODO(126): move 25% pre-allocation logic into Dictionary::Allocate
-    uint32_t at_least_space_for =
-        estimate_nof_elements + (estimate_nof_elements >> 2);
-    storage = Handle<FixedArray>::cast(
-        SeededNumberDictionary::New(isolate, at_least_space_for));
-  }
-
-  ArrayConcatVisitor visitor(isolate, storage, fast_case);
-
-  for (int i = 0; i < argument_count; i++) {
-    Handle<Object> obj(elements->get(i), isolate);
-    if (obj->IsJSArray()) {
-      Handle<JSArray> array = Handle<JSArray>::cast(obj);
-      if (!IterateElements(isolate, array, &visitor)) {
-        return isolate->heap()->exception();
-      }
-    } else {
-      visitor.visit(0, obj);
-      visitor.increase_index_offset(1);
-    }
-  }
-
-  if (visitor.exceeds_array_limit()) {
-    THROW_NEW_ERROR_RETURN_FAILURE(
-        isolate,
-        NewRangeError("invalid_array_length", HandleVector<Object>(NULL, 0)));
-  }
-  return *visitor.ToArray();
-}
-
-
-// Moves all own elements of an object, that are below a limit, to positions
-// starting at zero. All undefined values are placed after non-undefined values,
-// and are followed by non-existing element. Does not change the length
-// property.
-// Returns the number of non-undefined elements collected.
-// Returns -1 if hole removal is not supported by this method.
-RUNTIME_FUNCTION(Runtime_RemoveArrayHoles) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  CONVERT_NUMBER_CHECKED(uint32_t, limit, Uint32, args[1]);
-  return *JSObject::PrepareElementsForSort(object, limit);
-}
-
-
-// Move contents of argument 0 (an array) to argument 1 (an array)
-RUNTIME_FUNCTION(Runtime_MoveArrayContents) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSArray, from, 0);
-  CONVERT_ARG_HANDLE_CHECKED(JSArray, to, 1);
-  JSObject::ValidateElements(from);
-  JSObject::ValidateElements(to);
-
-  Handle<FixedArrayBase> new_elements(from->elements());
-  ElementsKind from_kind = from->GetElementsKind();
-  Handle<Map> new_map = JSObject::GetElementsTransitionMap(to, from_kind);
-  JSObject::SetMapAndElements(to, new_map, new_elements);
-  to->set_length(from->length());
-
-  JSObject::ResetElements(from);
-  from->set_length(Smi::FromInt(0));
-
-  JSObject::ValidateElements(to);
-  return *to;
-}
-
-
-// How many elements does this object/array have?
-RUNTIME_FUNCTION(Runtime_EstimateNumberOfElements) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSArray, array, 0);
-  Handle<FixedArrayBase> elements(array->elements(), isolate);
-  SealHandleScope shs(isolate);
-  if (elements->IsDictionary()) {
-    int result =
-        Handle<SeededNumberDictionary>::cast(elements)->NumberOfElements();
-    return Smi::FromInt(result);
-  } else {
-    DCHECK(array->length()->IsSmi());
-    // For packed elements, we know the exact number of elements
-    int length = elements->length();
-    ElementsKind kind = array->GetElementsKind();
-    if (IsFastPackedElementsKind(kind)) {
-      return Smi::FromInt(length);
-    }
-    // For holey elements, take samples from the buffer checking for holes
-    // to generate the estimate.
-    const int kNumberOfHoleCheckSamples = 97;
-    int increment = (length < kNumberOfHoleCheckSamples)
-                        ? 1
-                        : static_cast<int>(length / kNumberOfHoleCheckSamples);
-    ElementsAccessor* accessor = array->GetElementsAccessor();
-    int holes = 0;
-    for (int i = 0; i < length; i += increment) {
-      if (!accessor->HasElement(array, array, i, elements)) {
-        ++holes;
-      }
-    }
-    int estimate = static_cast<int>((kNumberOfHoleCheckSamples - holes) /
-                                    kNumberOfHoleCheckSamples * length);
-    return Smi::FromInt(estimate);
-  }
-}
-
-
-// Returns an array that tells you where in the [0, length) interval an array
-// might have elements.  Can either return an array of keys (positive integers
-// or undefined) or a number representing the positive length of an interval
-// starting at index 0.
-// Intervals can span over some keys that are not in the object.
-RUNTIME_FUNCTION(Runtime_GetArrayKeys) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, array, 0);
-  CONVERT_NUMBER_CHECKED(uint32_t, length, Uint32, args[1]);
-  if (array->elements()->IsDictionary()) {
-    Handle<FixedArray> keys = isolate->factory()->empty_fixed_array();
-    for (PrototypeIterator iter(isolate, array,
-                                PrototypeIterator::START_AT_RECEIVER);
-         !iter.IsAtEnd(); iter.Advance()) {
-      if (PrototypeIterator::GetCurrent(iter)->IsJSProxy() ||
-          JSObject::cast(*PrototypeIterator::GetCurrent(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 =
-          Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter));
-      Handle<FixedArray> current_keys =
-          isolate->factory()->NewFixedArray(current->NumberOfOwnElements(NONE));
-      current->GetOwnElementKeys(*current_keys, NONE);
-      ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-          isolate, keys, FixedArray::UnionOfKeys(keys, current_keys));
-    }
-    // Erase any keys >= length.
-    // TODO(adamk): Remove this step when the contract of %GetArrayKeys
-    // is changed to let this happen on the JS side.
-    for (int i = 0; i < keys->length(); i++) {
-      if (NumberToUint32(keys->get(i)) >= length) keys->set_undefined(i);
-    }
-    return *isolate->factory()->NewJSArrayWithElements(keys);
-  } else {
-    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));
-  }
-}
-
-
-RUNTIME_FUNCTION(Runtime_LookupAccessor) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 3);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
-  CONVERT_SMI_ARG_CHECKED(flag, 2);
-  AccessorComponent component = flag == 0 ? ACCESSOR_GETTER : ACCESSOR_SETTER;
-  if (!receiver->IsJSObject()) return isolate->heap()->undefined_value();
-  Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, result,
-      JSObject::GetAccessor(Handle<JSObject>::cast(receiver), name, component));
-  return *result;
-}
-
-
-// Collect the raw data for a stack trace.  Returns an array of 4
-// element segments each containing a receiver, function, code and
-// native code offset.
-RUNTIME_FUNCTION(Runtime_CollectStackTrace) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, error_object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, caller, 1);
-
-  if (!isolate->bootstrapper()->IsActive()) {
-    // Optionally capture a more detailed stack trace for the message.
-    isolate->CaptureAndSetDetailedStackTrace(error_object);
-    // Capture a simple stack trace for the stack property.
-    isolate->CaptureAndSetSimpleStackTrace(error_object, caller);
-  }
-  return isolate->heap()->undefined_value();
-}
-
-
-RUNTIME_FUNCTION(Runtime_LoadMutableDouble) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Smi, index, 1);
-  RUNTIME_ASSERT((index->value() & 1) == 1);
-  FieldIndex field_index =
-      FieldIndex::ForLoadByFieldIndex(object->map(), index->value());
-  if (field_index.is_inobject()) {
-    RUNTIME_ASSERT(field_index.property_index() <
-                   object->map()->inobject_properties());
-  } else {
-    RUNTIME_ASSERT(field_index.outobject_array_index() <
-                   object->properties()->length());
-  }
-  Handle<Object> raw_value(object->RawFastPropertyAt(field_index), isolate);
-  RUNTIME_ASSERT(raw_value->IsMutableHeapNumber());
-  return *Object::WrapForRead(isolate, raw_value, Representation::Double());
-}
-
-
-RUNTIME_FUNCTION(Runtime_TryMigrateInstance) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
-  if (!object->IsJSObject()) return Smi::FromInt(0);
-  Handle<JSObject> js_object = Handle<JSObject>::cast(object);
-  if (!js_object->map()->is_deprecated()) return Smi::FromInt(0);
-  // This call must not cause lazy deopts, because it's called from deferred
-  // code where we can't handle lazy deopts for lack of a suitable bailout
-  // ID. So we just try migration and signal failure if necessary,
-  // which will also trigger a deopt.
-  if (!JSObject::TryMigrateInstance(js_object)) return Smi::FromInt(0);
-  return *object;
-}
-
-
-RUNTIME_FUNCTION(Runtime_GetFromCache) {
-  SealHandleScope shs(isolate);
-  // This is only called from codegen, so checks might be more lax.
-  CONVERT_ARG_CHECKED(JSFunctionResultCache, cache, 0);
-  CONVERT_ARG_CHECKED(Object, key, 1);
-
-  {
-    DisallowHeapAllocation no_alloc;
-
-    int finger_index = cache->finger_index();
-    Object* o = cache->get(finger_index);
-    if (o == key) {
-      // The fastest case: hit the same place again.
-      return cache->get(finger_index + 1);
-    }
-
-    for (int i = finger_index - 2; i >= JSFunctionResultCache::kEntriesIndex;
-         i -= 2) {
-      o = cache->get(i);
-      if (o == key) {
-        cache->set_finger_index(i);
-        return cache->get(i + 1);
-      }
-    }
-
-    int size = cache->size();
-    DCHECK(size <= cache->length());
-
-    for (int i = size - 2; i > finger_index; i -= 2) {
-      o = cache->get(i);
-      if (o == key) {
-        cache->set_finger_index(i);
-        return cache->get(i + 1);
-      }
-    }
-  }
-
-  // There is no value in the cache.  Invoke the function and cache result.
-  HandleScope scope(isolate);
-
-  Handle<JSFunctionResultCache> cache_handle(cache);
-  Handle<Object> key_handle(key, isolate);
-  Handle<Object> value;
-  {
-    Handle<JSFunction> factory(JSFunction::cast(
-        cache_handle->get(JSFunctionResultCache::kFactoryIndex)));
-    // TODO(antonm): consider passing a receiver when constructing a cache.
-    Handle<JSObject> receiver(isolate->global_proxy());
-    // This handle is nor shared, nor used later, so it's safe.
-    Handle<Object> argv[] = {key_handle};
-    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-        isolate, value,
-        Execution::Call(isolate, factory, receiver, arraysize(argv), argv));
-  }
-
-#ifdef VERIFY_HEAP
-  if (FLAG_verify_heap) {
-    cache_handle->JSFunctionResultCacheVerify();
-  }
-#endif
-
-  // Function invocation may have cleared the cache.  Reread all the data.
-  int finger_index = cache_handle->finger_index();
-  int size = cache_handle->size();
-
-  // If we have spare room, put new data into it, otherwise evict post finger
-  // entry which is likely to be the least recently used.
-  int index = -1;
-  if (size < cache_handle->length()) {
-    cache_handle->set_size(size + JSFunctionResultCache::kEntrySize);
-    index = size;
-  } else {
-    index = finger_index + JSFunctionResultCache::kEntrySize;
-    if (index == cache_handle->length()) {
-      index = JSFunctionResultCache::kEntriesIndex;
-    }
-  }
-
-  DCHECK(index % 2 == 0);
-  DCHECK(index >= JSFunctionResultCache::kEntriesIndex);
-  DCHECK(index < cache_handle->length());
-
-  cache_handle->set(index, *key_handle);
-  cache_handle->set(index + 1, *value);
-  cache_handle->set_finger_index(index);
-
-#ifdef VERIFY_HEAP
-  if (FLAG_verify_heap) {
-    cache_handle->JSFunctionResultCacheVerify();
-  }
-#endif
-
-  return *value;
-}
-
-
-RUNTIME_FUNCTION(Runtime_MessageGetStartPosition) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(JSMessageObject, message, 0);
-  return Smi::FromInt(message->start_position());
-}
-
-
-RUNTIME_FUNCTION(Runtime_MessageGetScript) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(JSMessageObject, message, 0);
-  return message->script();
-}
-
-
-RUNTIME_FUNCTION(Runtime_IS_VAR) {
-  UNREACHABLE();  // implemented as macro in the parser
-  return NULL;
-}
-
-
-RUNTIME_FUNCTION(Runtime_IsJSGlobalProxy) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsJSGlobalProxy());
-}
-
-
-static Object* ArrayConstructorCommon(Isolate* isolate,
-                                      Handle<JSFunction> constructor,
-                                      Handle<AllocationSite> site,
-                                      Arguments* caller_args) {
-  Factory* factory = isolate->factory();
-
-  bool holey = false;
-  bool can_use_type_feedback = true;
-  if (caller_args->length() == 1) {
-    Handle<Object> argument_one = caller_args->at<Object>(0);
-    if (argument_one->IsSmi()) {
-      int value = Handle<Smi>::cast(argument_one)->value();
-      if (value < 0 || value >= JSObject::kInitialMaxFastElementArray) {
-        // the array is a dictionary in this case.
-        can_use_type_feedback = false;
-      } else if (value != 0) {
-        holey = true;
-      }
-    } else {
-      // Non-smi length argument produces a dictionary
-      can_use_type_feedback = false;
-    }
-  }
-
-  Handle<JSArray> array;
-  if (!site.is_null() && can_use_type_feedback) {
-    ElementsKind to_kind = site->GetElementsKind();
-    if (holey && !IsFastHoleyElementsKind(to_kind)) {
-      to_kind = GetHoleyElementsKind(to_kind);
-      // Update the allocation site info to reflect the advice alteration.
-      site->SetElementsKind(to_kind);
-    }
-
-    // We should allocate with an initial map that reflects the allocation site
-    // advice. Therefore we use AllocateJSObjectFromMap instead of passing
-    // the constructor.
-    Handle<Map> initial_map(constructor->initial_map(), isolate);
-    if (to_kind != initial_map->elements_kind()) {
-      initial_map = Map::AsElementsKind(initial_map, to_kind);
-    }
-
-    // If we don't care to track arrays of to_kind ElementsKind, then
-    // don't emit a memento for them.
-    Handle<AllocationSite> allocation_site;
-    if (AllocationSite::GetMode(to_kind) == TRACK_ALLOCATION_SITE) {
-      allocation_site = site;
-    }
-
-    array = Handle<JSArray>::cast(factory->NewJSObjectFromMap(
-        initial_map, NOT_TENURED, true, allocation_site));
-  } else {
-    array = Handle<JSArray>::cast(factory->NewJSObject(constructor));
-
-    // We might need to transition to holey
-    ElementsKind kind = constructor->initial_map()->elements_kind();
-    if (holey && !IsFastHoleyElementsKind(kind)) {
-      kind = GetHoleyElementsKind(kind);
-      JSObject::TransitionElementsKind(array, kind);
-    }
-  }
-
-  factory->NewJSArrayStorage(array, 0, 0, DONT_INITIALIZE_ARRAY_ELEMENTS);
-
-  ElementsKind old_kind = array->GetElementsKind();
-  RETURN_FAILURE_ON_EXCEPTION(
-      isolate, ArrayConstructInitializeElements(array, caller_args));
-  if (!site.is_null() &&
-      (old_kind != array->GetElementsKind() || !can_use_type_feedback)) {
-    // The arguments passed in caused a transition. This kind of complexity
-    // can't be dealt with in the inlined hydrogen array constructor case.
-    // We must mark the allocationsite as un-inlinable.
-    site->SetDoNotInlineCall();
-  }
-  return *array;
-}
-
-
-RUNTIME_FUNCTION(Runtime_ArrayConstructor) {
-  HandleScope scope(isolate);
-  // If we get 2 arguments then they are the stub parameters (constructor, type
-  // info).  If we get 4, then the first one is a pointer to the arguments
-  // passed by the caller, and the last one is the length of the arguments
-  // passed to the caller (redundant, but useful to check on the deoptimizer
-  // with an assert).
-  Arguments empty_args(0, NULL);
-  bool no_caller_args = args.length() == 2;
-  DCHECK(no_caller_args || args.length() == 4);
-  int parameters_start = no_caller_args ? 0 : 1;
-  Arguments* caller_args =
-      no_caller_args ? &empty_args : reinterpret_cast<Arguments*>(args[0]);
-  CONVERT_ARG_HANDLE_CHECKED(JSFunction, constructor, parameters_start);
-  CONVERT_ARG_HANDLE_CHECKED(Object, type_info, parameters_start + 1);
-#ifdef DEBUG
-  if (!no_caller_args) {
-    CONVERT_SMI_ARG_CHECKED(arg_count, parameters_start + 2);
-    DCHECK(arg_count == caller_args->length());
-  }
-#endif
-
-  Handle<AllocationSite> site;
-  if (!type_info.is_null() &&
-      *type_info != isolate->heap()->undefined_value()) {
-    site = Handle<AllocationSite>::cast(type_info);
-    DCHECK(!site->SitePointsToLiteral());
-  }
-
-  return ArrayConstructorCommon(isolate, constructor, site, caller_args);
-}
-
-
-RUNTIME_FUNCTION(Runtime_InternalArrayConstructor) {
-  HandleScope scope(isolate);
-  Arguments empty_args(0, NULL);
-  bool no_caller_args = args.length() == 1;
-  DCHECK(no_caller_args || args.length() == 3);
-  int parameters_start = no_caller_args ? 0 : 1;
-  Arguments* caller_args =
-      no_caller_args ? &empty_args : reinterpret_cast<Arguments*>(args[0]);
-  CONVERT_ARG_HANDLE_CHECKED(JSFunction, constructor, parameters_start);
-#ifdef DEBUG
-  if (!no_caller_args) {
-    CONVERT_SMI_ARG_CHECKED(arg_count, parameters_start + 1);
-    DCHECK(arg_count == caller_args->length());
-  }
-#endif
-  return ArrayConstructorCommon(isolate, constructor,
-                                Handle<AllocationSite>::null(), caller_args);
-}
-
-
-RUNTIME_FUNCTION(Runtime_NormalizeElements) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, array, 0);
-  RUNTIME_ASSERT(!array->HasExternalArrayElements() &&
-                 !array->HasFixedTypedArrayElements());
-  JSObject::NormalizeElements(array);
-  return *array;
-}
-
-
-RUNTIME_FUNCTION(Runtime_MaxSmi) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 0);
-  return Smi::FromInt(Smi::kMaxValue);
-}
-
-
-// TODO(dcarney): remove this function when TurboFan supports it.
-// Takes the object to be iterated over and the result of GetPropertyNamesFast
-// Returns pair (cache_array, cache_type).
-RUNTIME_FUNCTION_RETURN_PAIR(Runtime_ForInInit) {
-  SealHandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  // This simulates CONVERT_ARG_HANDLE_CHECKED for calls returning pairs.
-  // Not worth creating a macro atm as this function should be removed.
-  if (!args[0]->IsJSReceiver() || !args[1]->IsObject()) {
-    Object* error = isolate->ThrowIllegalOperation();
-    return MakePair(error, isolate->heap()->undefined_value());
-  }
-  Handle<JSReceiver> object = args.at<JSReceiver>(0);
-  Handle<Object> cache_type = args.at<Object>(1);
-  if (cache_type->IsMap()) {
-    // Enum cache case.
-    if (Map::EnumLengthBits::decode(Map::cast(*cache_type)->bit_field3()) ==
-        0) {
-      // 0 length enum.
-      // Can't handle this case in the graph builder,
-      // so transform it into the empty fixed array case.
-      return MakePair(isolate->heap()->empty_fixed_array(), Smi::FromInt(1));
-    }
-    return MakePair(object->map()->instance_descriptors()->GetEnumCache(),
-                    *cache_type);
-  } else {
-    // FixedArray case.
-    Smi* new_cache_type = Smi::FromInt(object->IsJSProxy() ? 0 : 1);
-    return MakePair(*Handle<FixedArray>::cast(cache_type), new_cache_type);
-  }
-}
-
-
-// TODO(dcarney): remove this function when TurboFan supports it.
-RUNTIME_FUNCTION(Runtime_ForInCacheArrayLength) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(Object, cache_type, 0);
-  CONVERT_ARG_HANDLE_CHECKED(FixedArray, array, 1);
-  int length = 0;
-  if (cache_type->IsMap()) {
-    length = Map::cast(*cache_type)->EnumLength();
-  } else {
-    DCHECK(cache_type->IsSmi());
-    length = array->length();
-  }
-  return Smi::FromInt(length);
-}
-
-
-// TODO(dcarney): remove this function when TurboFan supports it.
-// Takes (the object to be iterated over,
-//        cache_array from ForInInit,
-//        cache_type from ForInInit,
-//        the current index)
-// Returns pair (array[index], needs_filtering).
-RUNTIME_FUNCTION_RETURN_PAIR(Runtime_ForInNext) {
-  SealHandleScope scope(isolate);
-  DCHECK(args.length() == 4);
-  int32_t index;
-  // This simulates CONVERT_ARG_HANDLE_CHECKED for calls returning pairs.
-  // Not worth creating a macro atm as this function should be removed.
-  if (!args[0]->IsJSReceiver() || !args[1]->IsFixedArray() ||
-      !args[2]->IsObject() || !args[3]->ToInt32(&index)) {
-    Object* error = isolate->ThrowIllegalOperation();
-    return MakePair(error, isolate->heap()->undefined_value());
-  }
-  Handle<JSReceiver> object = args.at<JSReceiver>(0);
-  Handle<FixedArray> array = args.at<FixedArray>(1);
-  Handle<Object> cache_type = args.at<Object>(2);
-  // Figure out first if a slow check is needed for this object.
-  bool slow_check_needed = false;
-  if (cache_type->IsMap()) {
-    if (object->map() != Map::cast(*cache_type)) {
-      // Object transitioned.  Need slow check.
-      slow_check_needed = true;
-    }
-  } else {
-    // No slow check needed for proxies.
-    slow_check_needed = Smi::cast(*cache_type)->value() == 1;
-  }
-  return MakePair(array->get(index),
-                  isolate->heap()->ToBoolean(slow_check_needed));
-}
-
-
-// ----------------------------------------------------------------------------
-// Reference implementation for inlined runtime functions.  Only used when the
-// compiler does not support a certain intrinsic.  Don't optimize these, but
-// implement the intrinsic in the respective compiler instead.
-
-// TODO(mstarzinger): These are place-holder stubs for TurboFan and will
-// eventually all have a C++ implementation and this macro will be gone.
-#define U(name)                               \
-  RUNTIME_FUNCTION(RuntimeReference_##name) { \
-    UNIMPLEMENTED();                          \
-    return NULL;                              \
-  }
-
-U(IsStringWrapperSafeForDefaultValueOf)
-U(DebugBreakInOptimizedCode)
-
-#undef U
-
-
-RUNTIME_FUNCTION(RuntimeReference_IsArray) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsJSArray());
-}
-
-
-
-RUNTIME_FUNCTION(RuntimeReference_ValueOf) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  if (!obj->IsJSValue()) return obj;
-  return JSValue::cast(obj)->value();
-}
-
-
-RUNTIME_FUNCTION(RuntimeReference_SetValueOf) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  CONVERT_ARG_CHECKED(Object, value, 1);
-  if (!obj->IsJSValue()) return value;
-  JSValue::cast(obj)->set_value(value);
-  return value;
-}
-
-
-RUNTIME_FUNCTION(RuntimeReference_ObjectEquals) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_CHECKED(Object, obj1, 0);
-  CONVERT_ARG_CHECKED(Object, obj2, 1);
-  return isolate->heap()->ToBoolean(obj1 == obj2);
-}
-
-
-RUNTIME_FUNCTION(RuntimeReference_IsObject) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  if (!obj->IsHeapObject()) return isolate->heap()->false_value();
-  if (obj->IsNull()) return isolate->heap()->true_value();
-  if (obj->IsUndetectableObject()) return isolate->heap()->false_value();
-  Map* map = HeapObject::cast(obj)->map();
-  bool is_non_callable_spec_object =
-      map->instance_type() >= FIRST_NONCALLABLE_SPEC_OBJECT_TYPE &&
-      map->instance_type() <= LAST_NONCALLABLE_SPEC_OBJECT_TYPE;
-  return isolate->heap()->ToBoolean(is_non_callable_spec_object);
-}
-
-
-RUNTIME_FUNCTION(RuntimeReference_IsUndetectableObject) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsUndetectableObject());
-}
-
-
-RUNTIME_FUNCTION(RuntimeReference_IsSpecObject) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsSpecObject());
-}
-
-
-RUNTIME_FUNCTION(RuntimeReference_HasCachedArrayIndex) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  return isolate->heap()->false_value();
-}
-
-
-RUNTIME_FUNCTION(RuntimeReference_GetCachedArrayIndex) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  return isolate->heap()->undefined_value();
-}
-
-
-RUNTIME_FUNCTION(RuntimeReference_FastOneByteArrayJoin) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 2);
-  return isolate->heap()->undefined_value();
-}
-
-
-RUNTIME_FUNCTION(RuntimeReference_ClassOf) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  if (!obj->IsJSReceiver()) return isolate->heap()->null_value();
-  return JSReceiver::cast(obj)->class_name();
-}
-
-
-RUNTIME_FUNCTION(RuntimeReference_GetFromCache) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_SMI_ARG_CHECKED(id, 0);
-  args[0] = isolate->native_context()->jsfunction_result_caches()->get(id);
-  return __RT_impl_Runtime_GetFromCache(args, isolate);
-}
-
-
-// ----------------------------------------------------------------------------
-// Implementation of Runtime
-
 #define F(name, number_of_args, result_size)                                  \
   {                                                                           \
     Runtime::k##name, Runtime::RUNTIME, #name, FUNCTION_ADDR(Runtime_##name), \
         number_of_args, result_size                                           \
   }                                                                           \
   ,
 
 
 #define I(name, number_of_args, result_size)                                \
   {                                                                         \
@@ skipping 63 matching lines @@
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 
 std::ostream& operator<<(std::ostream& os, Runtime::FunctionId id) {
   return os << Runtime::FunctionForId(id)->name;
 }
 
 }  // namespace internal
 }  // namespace v8