From c8836ac6924801a31e6d284f2f00c401d3a64668 Mon Sep 17 00:00:00 2001
From: hackmud-dtr <hackmud.dtr@gmail.com>
Date: Tue, 6 Jul 2021 00:18:13 -0700
Subject: [PATCH] Fix sign-extension in Isolate Data

C++ will 'promote' a bitfield member that is narrower than an int into an int on arithmetic, leading to sign extension when converted back to a wider type.
---
 ext/mini_racer_extension/mini_racer_extension.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/mini_racer_extension/mini_racer_extension.cc b/ext/mini_racer_extension/mini_racer_extension.cc
index f930ac83..c81eef0b 100644
--- a/ext/mini_racer_extension/mini_racer_extension.cc
+++ b/ext/mini_racer_extension/mini_racer_extension.cc
@@ -155,7 +155,7 @@ class IsolateData {
             case IN_GVL: return u.IN_GVL;
             case DO_TERMINATE: return u.DO_TERMINATE;
             case MEM_SOFTLIMIT_REACHED: return u.MEM_SOFTLIMIT_REACHED;
-            case MEM_SOFTLIMIT_MAX: return u.MEM_SOFTLIMIT_MAX << 10;
+            case MEM_SOFTLIMIT_MAX: return static_cast<uintptr_t>(u.MEM_SOFTLIMIT_MAX) << 10;
             case MARSHAL_STACKDEPTH_REACHED: return u.MARSHAL_STACKDEPTH_REACHED;
             case MARSHAL_STACKDEPTH_VALUE: return u.MARSHAL_STACKDEPTH_VALUE;
             case MARSHAL_STACKDEPTH_MAX: return u.MARSHAL_STACKDEPTH_MAX;