[modules] Basic support of exports

src/runtime/runtime-scopes.cc

Index: src/runtime/runtime-scopes.cc
diff --git a/src/runtime/runtime-scopes.cc b/src/runtime/runtime-scopes.cc
index acdce8d1cf294af4b986d5b741cb5a4ef7f0b8d4..b55336fb8051584819c80ae067c9694311ff3ec5 100644
--- a/src/runtime/runtime-scopes.cc
+++ b/src/runtime/runtime-scopes.cc
@@ -217,6 +217,7 @@ Object* DeclareEvalHelper(Isolate* isolate, Handle<String> name,
   // a declaration block scope. Since this is called from eval, the context
   // passed is the context of the caller, which may be some nested context and
   // not the declaration context.
+  // XXX module context???
   Handle<Context> context_arg(isolate->context(), isolate);
   Handle<Context> context(context_arg->declaration_context(), isolate);
 
@@ -699,6 +700,19 @@ RUNTIME_FUNCTION(Runtime_PushWithContext) {
   return *context;
 }
 
+RUNTIME_FUNCTION(Runtime_PushModuleContext) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(3, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(JSModule, module, 0);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 1);
+  CONVERT_ARG_HANDLE_CHECKED(ScopeInfo, scope_info, 2);
+  DCHECK(function->context() == isolate->context());
+
+  Handle<Context> context =
+      isolate->factory()->NewModuleContext(module, function, scope_info);
+  isolate->set_context(*context);
+  return *context;
+}
 
 RUNTIME_FUNCTION(Runtime_PushCatchContext) {
   HandleScope scope(isolate);