From d0b283e596b3ea7da7438b1a17f4ecfb98e7c97a Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Wed, 8 Dec 2010 19:11:58 +0100
Subject: [PATCH] Avoid stack resizes while recording calls to vararg
 functions.

FUNCV might have been recorded twice (with ill effects).
---
 src/lj_dispatch.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/lj_dispatch.c b/src/lj_dispatch.c
index 80a6ef2f..4eb6033b 100644
--- a/src/lj_dispatch.c
+++ b/src/lj_dispatch.c
@@ -388,9 +388,12 @@ void LJ_FASTCALL lj_dispatch_ins(lua_State *L, const BCIns *pc)
 static int call_init(lua_State *L, GCfunc *fn)
 {
   if (isluafunc(fn)) {
-    int numparams = funcproto(fn)->numparams;
+    GCproto *pt = funcproto(fn);
+    int numparams = pt->numparams;
     int gotparams = (int)(L->top - L->base);
-    lj_state_checkstack(L, (MSize)numparams);
+    int need = pt->framesize;
+    if ((pt->flags & PROTO_IS_VARARG)) need += 1+gotparams;
+    lj_state_checkstack(L, (MSize)need);
     numparams -= gotparams;
     return numparams >= 0 ? numparams : 0;
   } else {