From 9aa9ff12dd75173ecba5b76cbb111f9f953b7088 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petri=20H=C3=A4kkinen?=
 <petrihakkinen@users.noreply.github.com>
Date: Tue, 30 Nov 2021 18:14:12 +0200
Subject: [PATCH] Add LUA_GCCOUNTB option for lua_gc (#254)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-authored-by: Petri Häkkinen <petrih@rmd.remedy.fi>
---
 VM/include/lua.h | 1 +
 VM/src/lapi.cpp  | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/VM/include/lua.h b/VM/include/lua.h
index ebe7bbc5..a2c72213 100644
--- a/VM/include/lua.h
+++ b/VM/include/lua.h
@@ -231,6 +231,7 @@ enum lua_GCOp
     LUA_GCRESTART,
     LUA_GCCOLLECT,
     LUA_GCCOUNT,
+    LUA_GCCOUNTB,
     LUA_GCISRUNNING,
 
     // garbage collection is handled by 'assists' that perform some amount of GC work matching pace of allocation
diff --git a/VM/src/lapi.cpp b/VM/src/lapi.cpp
index 832849ac..3f4c0fd6 100644
--- a/VM/src/lapi.cpp
+++ b/VM/src/lapi.cpp
@@ -1039,6 +1039,11 @@ int lua_gc(lua_State* L, int what, int data)
         res = cast_int(g->totalbytes >> 10);
         break;
     }
+    case LUA_GCCOUNTB:
+    {
+        res = cast_int(g->totalbytes & 1023);
+        break;
+    }
     case LUA_GCISRUNNING:
     {
         res = (g->GCthreshold != SIZE_MAX);