Add WeakMap to v8.h

src/factory.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/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/conversions.h"
 #include "src/isolate-inl.h"
@@ skipping 2218 matching lines @@
   Handle<JSObject> result = NewJSObjectFromMap(map);
   Handle<Smi> value(Smi::FromInt(length), isolate());
   Object::SetProperty(result, length_string(), value, STRICT).Assert();
   if (!strict_mode_callee) {
     Object::SetProperty(result, callee_string(), callee, STRICT).Assert();
   }
   return result;
 }
 
 
+Handle<JSWeakMap> Factory::NewJSWeakMap() {
+  // TODO(adamk): Currently the map is only created three times per
+  // isolate. If it's created more often, the map should be moved into the
+  // strong root list.
+  Handle<Map> map = NewMap(JS_WEAK_MAP_TYPE, JSWeakMap::kSize);
+  return Handle<JSWeakMap>::cast(NewJSObjectFromMap(map));
+}
+
+
 Handle<JSFunction> Factory::CreateApiFunction(
     Handle<FunctionTemplateInfo> obj,
     Handle<Object> prototype,
     ApiInstanceType instance_type) {
   Handle<Code> code = isolate()->builtins()->HandleApiCall();
   Handle<Code> construct_stub = isolate()->builtins()->JSConstructStubApi();
 
   obj->set_instantiated(true);
   Handle<JSFunction> result;
   if (obj->remove_prototype()) {
@@ skipping 265 matching lines @@
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal