From c2644d4c2efe7b1231fcd1c5f9dad91eeff46c1c Mon Sep 17 00:00:00 2001
From: Nick Zavaritsky <mejedi@gmail.com>
Date: Sun, 6 Nov 2016 17:33:21 +0300
Subject: [PATCH] Report parent for stitched traces in trace start vmevent

---
 src/lj_trace.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/lj_trace.c b/src/lj_trace.c
index 87146832..31676293 100644
--- a/src/lj_trace.c
+++ b/src/lj_trace.c
@@ -446,6 +446,13 @@ static void trace_start(jit_State *J)
     if (J->parent) {
       setintV(L->top++, J->parent);
       setintV(L->top++, J->exitno);
+    } else {
+      BCOp op = bc_op(*J->pc);
+      if (op == BC_CALLM || op == BC_CALL || op == BC_ITERC) {
+        /* stitching, parent stored as exitno */
+        setintV(L->top++, J->exitno);
+        setintV(L->top++, 0);
+      }
     }
   );
   lj_record_setup(J);