[api] Prototype WeakRef implementation

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 4007 matching lines @@
         handle(isolate()->builtins()->builtin(Builtins::kPromiseThrowerFinally),
                isolate());
     Handle<SharedFunctionInfo> info = factory()->NewSharedFunctionInfo(
         factory()->empty_string(), code, false);
     info->set_internal_formal_parameter_count(0);
     info->set_length(0);
     native_context()->set_promise_thrower_finally_shared_fun(*info);
   }
 }
 
+void Genesis::InitializeGlobal_harmony_weakref() {
+  if (!FLAG_harmony_weakref) return;
+
+  Handle<JSFunction> js_weak_ref_fun = InstallFunction(
+      global, "WeakRef", JS_WEAK_REF_TYPE, JSWeakRef::kSize,
+      isolate->initial_object_prototype(), Builtins::kIllegal);
+  InstallWithIntrinsicDefaultProto(isolate, js_weak_ref_fun,
+                                   Context::JS_WEAK_REF_FUN_INDEX);
+}
+
 void Genesis::InitializeGlobal_harmony_regexp_dotall() {
   if (!FLAG_harmony_regexp_dotall) return;
 
   Handle<JSFunction> constructor(native_context()->regexp_function());
   Handle<JSObject> prototype(JSObject::cast(constructor->instance_prototype()));
 
   SimpleInstallGetter(prototype, isolate()->factory()->dotAll_string(),
                       Builtins::kRegExpPrototypeDotAllGetter, true);
 
   // The regexp prototype map has changed because we added a property
@@ skipping 1228 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8