[typedarrays] Implement %TypedArray%.prototype.reverse in C++

src/builtins/builtins-typedarray.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/builtins/builtins-utils.h"
 #include "src/builtins/builtins.h"
 #include "src/counters.h"
 #include "src/elements.h"
 #include "src/objects-inl.h"
 
@@ skipping 237 matching lines @@
   if (V8_UNLIKELY(array->WasNeutered())) return Smi::FromInt(-1);
 
   Handle<Object> search_element = args.atOrUndefined(isolate, 1);
   ElementsAccessor* elements = array->GetElementsAccessor();
   Maybe<int64_t> result = elements->LastIndexOfValue(
       isolate, array, search_element, static_cast<uint32_t>(index));
   MAYBE_RETURN(result, isolate->heap()->exception());
   return *isolate->factory()->NewNumberFromInt64(result.FromJust());
 }
 
+BUILTIN(TypedArrayPrototypeReverse) {
+  HandleScope scope(isolate);
+
+  Handle<JSTypedArray> array;
+  const char* method = "%TypedArray%.prototype.reverse";
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
+      isolate, array, JSTypedArray::Validate(isolate, args.receiver(), method));
+
+  if (V8_UNLIKELY(array->WasNeutered())) return *array;
+
+  ElementsAccessor* elements = array->GetElementsAccessor();
+  elements->Reverse(*array);
+  return *array;
+}
+
 }  // namespace internal
 }  // namespace v8