Expose SIMD.Float32x4 type to Javascript.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 43fc0eb8355a7ad0d1be7ccb0fe4bd233ac81dd9..5f19880409168c4d7d56247d719763c8633d061b 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1820,6 +1820,7 @@ EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_sharedarraybuffer)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_atomics)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_new_target)
 EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_concat_spreadable)
+EMPTY_NATIVE_FUNCTIONS_FOR_FEATURE(harmony_simd)
 
 
 void Genesis::InstallNativeFunctions_harmony_proxies() {
@@ -1928,6 +1929,32 @@ void Genesis::InitializeGlobal_harmony_sharedarraybuffer() {
 }
 
 
+void Genesis::InitializeGlobal_harmony_simd() {
+  Handle<JSGlobalObject> global(
+      JSGlobalObject::cast(native_context()->global_object()));
+  Isolate* isolate = global->GetIsolate();
+  Factory* factory = isolate->factory();
+
+  Handle<String> name = factory->InternalizeUtf8String("SIMD");
+  Handle<JSFunction> cons = factory->NewFunction(name);
+  JSFunction::SetInstancePrototype(
+      cons,
+      Handle<Object>(native_context()->initial_object_prototype(), isolate));
+  cons->SetInstanceClassName(*name);
+  Handle<JSObject> simd_object = factory->NewJSObject(cons, TENURED);
+  DCHECK(simd_object->IsJSObject());
+  JSObject::AddProperty(global, name, simd_object, DONT_ENUM);
+
+  Handle<JSFunction> float32x4_function =
+      InstallFunction(simd_object, "Float32x4", JS_VALUE_TYPE, JSValue::kSize,
+                      isolate->initial_object_prototype(), Builtins::kIllegal);
+  // Set the instance class name since InstallFunction only does this when
+  // we install on the GlobalObject.
+  float32x4_function->SetInstanceClassName(*factory->Float32x4_string());
+  native_context()->set_float32x4_function(*float32x4_function);
+}
+
+
 Handle<JSFunction> Genesis::InstallInternalArray(Handle<JSObject> target,
                                                  const char* name,
                                                  ElementsKind elements_kind) {
@@ -2504,6 +2531,8 @@ bool Genesis::InstallExperimentalNatives() {
   static const char* harmony_new_target_natives[] = {nullptr};
   static const char* harmony_concat_spreadable_natives[] = {
       "native harmony-concat-spreadable.js", nullptr};
+  static const char* harmony_simd_natives[] = {"native harmony-simd.js",
+                                               nullptr};
 
   for (int i = ExperimentalNatives::GetDebuggerCount();
        i < ExperimentalNatives::GetBuiltinsCount(); i++) {