Install the 'name' property in classes at runtime

src/runtime/runtime-classes.cc

Index: src/runtime/runtime-classes.cc
diff --git a/src/runtime/runtime-classes.cc b/src/runtime/runtime-classes.cc
index 323604ffdec47047d31e14cd4600fa9e0f78e068..511d2cd1f18aa885d51ad2e57a51683fa98cbe41 100644
--- a/src/runtime/runtime-classes.cc
+++ b/src/runtime/runtime-classes.cc
@@ -7,6 +7,7 @@
 #include <stdlib.h>
 #include <limits>
 
+#include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/debug/debug.h"
 #include "src/frames-inl.h"
@@ -188,6 +189,32 @@ RUNTIME_FUNCTION(Runtime_DefineClass) {
                            end_position));
 }
 
+
+RUNTIME_FUNCTION(Runtime_InstallClassNameAccessor) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 2);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
+  CONVERT_BOOLEAN_ARG_CHECKED(needs_name_check, 1);
+
+  // If a property named "name" is already defined, exit.
+  if (needs_name_check) {
+    Handle<Name> key = isolate->factory()->name_string();
+    if (JSObject::HasRealNamedProperty(object, key).FromMaybe(false)) {
+      return *object;
+    }
+  }
+
+  // Define the "name" accessor.
+  PropertyAttributes attrs =
+      static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
+  // Cannot fail since this should only be called when creating an object
+  // literal.
+  CHECK(!JSObject::SetAccessor(
+             object, Accessors::FunctionNameInfo(object->GetIsolate(), attrs))
+             .is_null());
+  return *object;
+}
+
 namespace {
 
 enum class SuperMode { kLoad, kStore };