From fc08312ebf8cf01a53b4826acce0f1c3aedcdc53 Mon Sep 17 00:00:00 2001
From: Benoit Giannangeli <giann008@gmail.com>
Date: Wed, 12 Apr 2017 07:55:38 +0200
Subject: debug.traceback

---
 src/ldblib.js | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'src/ldblib.js')

diff --git a/src/ldblib.js b/src/ldblib.js
index 426cef2..318e616 100644
--- a/src/ldblib.js
+++ b/src/ldblib.js
@@ -84,8 +84,23 @@ const db_upvalueid = function(L) {
    return 1;
 };
 
+const db_traceback = function(L) {
+    let thread = getthread(L);
+    let L1 = thread.thread;
+    let arg = thread.arg;
+    let msg = lapi.lua_tostring(L, arg + 1);
+    if (msg === null && !lapi.lua_isnoneornil(L, arg + 1))  /* non-string 'msg'? */
+        lapi.lua_pushvalue(L, arg + 1);  /* return it untouched */
+    else {
+        let level = lauxlib.luaL_optinteger(L, arg + 2, L === L1 ? 1 : 0);
+        lauxlib.luaL_traceback(L, L1, msg, level);
+    }
+    return 1;
+};
+
 const dblib = {
-    "getlocal": db_getlocal,
+    "getlocal":  db_getlocal,
+    "traceback": db_traceback,
     "upvalueid": db_upvalueid
 };
 
-- 
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