WIP Atomics

src/runtime/runtime-utils.h

Index: src/runtime/runtime-utils.h
diff --git a/src/runtime/runtime-utils.h b/src/runtime/runtime-utils.h
index c44e40208fda9ed8bb9fad5852995349ca89d480..73e55a4ad88d65623f5c3417707f242d2af9575e 100644
--- a/src/runtime/runtime-utils.h
+++ b/src/runtime/runtime-utils.h
@@ -54,6 +54,15 @@ namespace internal {
   RUNTIME_ASSERT(args[index]->IsNumber());      \
   double name = args.number_at(index);
 
+
+// TODO(binji): document
+#define CONVERT_SIZE_ARG_CHECKED(name, index)            \
+  RUNTIME_ASSERT(args[index]->IsNumber());               \
+  Handle<Object> name##_object = args.at<Object>(index); \
+  size_t name = 0;                                       \
+  RUNTIME_ASSERT(TryNumberToSize(isolate, *name##_object, &name));
+
+
 // Call the specified converter on the object *comand store the result in
 // a variable of the specified type with the given name.  If the
 // object is not a Number call IllegalOperation and return.