[builtins] Array.prototype.filter implemented as a TurboFan code stub.

src/bootstrapper.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/base/ieee754.h"
 #include "src/code-stubs.h"
@@ skipping 3658 matching lines @@
   Isolate* isolate = global->GetIsolate();
   Factory* factory = isolate->factory();
 
   LookupIterator it1(global, factory->NewStringFromAsciiChecked("Array"),
                      LookupIterator::OWN_SKIP_INTERCEPTOR);
   Handle<Object> array_object = Object::GetProperty(&it1).ToHandleChecked();
   LookupIterator it2(array_object,
                      factory->NewStringFromAsciiChecked("prototype"),
                      LookupIterator::OWN_SKIP_INTERCEPTOR);
   Handle<Object> array_prototype = Object::GetProperty(&it2).ToHandleChecked();
+
   LookupIterator it3(array_prototype,
                      factory->NewStringFromAsciiChecked("forEach"),
                      LookupIterator::OWN_SKIP_INTERCEPTOR);
   Handle<Object> for_each_function =
       Object::GetProperty(&it3).ToHandleChecked();
   Handle<JSFunction>::cast(for_each_function)
       ->set_code(isolate->builtins()->builtin(Builtins::kArrayForEach));
   Handle<JSFunction>::cast(for_each_function)
       ->shared()
       ->set_code(isolate->builtins()->builtin(Builtins::kArrayForEach));
@@ skipping 10 matching lines @@
 
   LookupIterator it5(array_prototype,
                      factory->NewStringFromAsciiChecked("some"),
                      LookupIterator::OWN_SKIP_INTERCEPTOR);
   Handle<Object> some_function = Object::GetProperty(&it5).ToHandleChecked();
   Handle<JSFunction>::cast(some_function)
       ->set_code(isolate->builtins()->builtin(Builtins::kArraySome));
   Handle<JSFunction>::cast(some_function)
       ->shared()
       ->set_code(isolate->builtins()->builtin(Builtins::kArraySome));
+
+  if (FLAG_experimental_array_builtins) {
+    LookupIterator it6(array_prototype,
+                       factory->NewStringFromAsciiChecked("filter"),
+                       LookupIterator::OWN_SKIP_INTERCEPTOR);
+    Handle<Object> filter_function =
+        Object::GetProperty(&it6).ToHandleChecked();
+    Handle<JSFunction>::cast(filter_function)
+        ->set_code(isolate->builtins()->builtin(Builtins::kArrayFilter));
+    Handle<JSFunction>::cast(filter_function)
+        ->shared()
+        ->set_code(isolate->builtins()->builtin(Builtins::kArrayFilter));
+  }
 }
 
 void Genesis::InitializeGlobal_harmony_sharedarraybuffer() {
   if (!FLAG_harmony_sharedarraybuffer) return;
 
   Handle<JSGlobalObject> global(native_context()->global_object());
   Isolate* isolate = global->GetIsolate();
   Factory* factory = isolate->factory();
 
   Handle<JSFunction> shared_array_buffer_fun =
@@ skipping 1344 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8