[Atomics] code stubs for atomic operations

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index b538db1d86838169a1c9171241628d5b7ad61db1..770425e490cb2089fd2d0d2ecb4f43cdf8f4a012 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2418,9 +2418,24 @@ 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 =
       InstallArrayBuffer(global, "SharedArrayBuffer");
   native_context()->set_shared_array_buffer_fun(*shared_array_buffer_fun);
+
+  Handle<String> name = factory->InternalizeUtf8String("Atomics");
+  Handle<JSFunction> cons = factory->NewFunction(name);
+  JSFunction::SetInstancePrototype(
+      cons,
+      Handle<Object>(native_context()->initial_object_prototype(), isolate));
+  Handle<JSObject> atomics_object = factory->NewJSObject(cons, TENURED);
+  DCHECK(atomics_object->IsJSObject());
+  JSObject::AddProperty(global, name, atomics_object, DONT_ENUM);
+
+  SimpleInstallFunction(atomics_object, factory->InternalizeUtf8String("load"),
+                        Builtins::kAtomicsLoadCheck, 2, false);

[Jarin, 2016/02/03 09:04:07]

Here, you should pass "true" as the last argument. This would make sure that the
builtin is always called with two arguments (if the caller provides different
number of arguments, extra arguments will be ignored and missing arguments will
be undefined).

[binji, 2016/02/03 22:09:02]

Cool, that seems to work. Thanks! I saw "adapt", but I didn't know what that
meant. :)

 }