[modules] Implement namespace imports.

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/accessors.h"
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1717 matching lines @@
     } else {
       DCHECK(mode == INITIALIZE_ARRAY_ELEMENTS_WITH_HOLE);
       elms = NewFixedArrayWithHoles(capacity);
     }
   }
 
   array->set_elements(*elms);
   array->set_length(Smi::FromInt(length));
 }
 
+Handle<JSModuleNamespace> Factory::NewJSModuleNamespace() {
+  Handle<Map> map = isolate()->js_module_namespace_map();
+  return Handle<JSModuleNamespace>::cast(NewJSObjectFromMap(map));
+}
 
 Handle<JSGeneratorObject> Factory::NewJSGeneratorObject(
     Handle<JSFunction> function) {
   DCHECK(IsResumableFunction(function->shared()->kind()));
   JSFunction::EnsureHasInitialMap(function);
   Handle<Map> map(function->initial_map());
   DCHECK_EQ(JS_GENERATOR_OBJECT_TYPE, map->instance_type());
   CALL_HEAP_FUNCTION(
       isolate(),
       isolate()->heap()->AllocateJSObjectFromMap(*map),
@@ skipping 10 matching lines @@
       requested_modules_length > 0 ? NewFixedArray(requested_modules_length)
                                    : empty_fixed_array();
 
   // To make it easy to hash Modules, we set a new symbol as the name of
   // SharedFunctionInfo representing this Module.
   Handle<Symbol> name_symbol = NewSymbol();
   code->set_name(*name_symbol);
 
   Handle<Module> module = Handle<Module>::cast(NewStruct(MODULE_TYPE));
   module->set_code(*code);
+  module->set_embedder_data(isolate()->heap()->undefined_value());
   module->set_exports(*exports);
+  module->set_flags(0);
+  module->set_module_namespace(isolate()->heap()->undefined_value());
   module->set_requested_modules(*requested_modules);
-  module->set_flags(0);
-  module->set_embedder_data(isolate()->heap()->undefined_value());
   return module;
 }
 
 Handle<JSArrayBuffer> Factory::NewJSArrayBuffer(SharedFlag shared,
                                                 PretenureFlag pretenure) {
   Handle<JSFunction> array_buffer_fun(
       shared == SharedFlag::kShared
           ? isolate()->native_context()->shared_array_buffer_fun()
           : isolate()->native_context()->array_buffer_fun());
   CALL_HEAP_FUNCTION(isolate(), isolate()->heap()->AllocateJSObject(
@@ skipping 821 matching lines @@
     Handle<AccessorInfo> prototype =
         Accessors::FunctionPrototypeInfo(isolate(), attribs);
     AccessorConstantDescriptor d(Handle<Name>(Name::cast(prototype->name())),
                                  prototype, attribs);
     map->AppendDescriptor(&d);
   }
 }
 
 }  // namespace internal
 }  // namespace v8