From Lua 5.2: debug.getlocal() accepts function arg, too.

1 files changed, 8 insertions, 4 deletions

diff --git a/src/lj_debug.c b/src/lj_debug.c
index 85dbac50..d5693779 100644
--- a/src/lj_debug.c
+++ b/src/lj_debug.c
@@ -401,10 +401,14 @@ void lj_debug_pushloc(lua_State *L, GCproto *pt, BCPos pc)
 LUA_API const char *lua_getlocal(lua_State *L, const lua_Debug *ar, int n)
 {
   const char *name = NULL;
-  TValue *o = debug_localname(L, ar, &name, (BCReg)n);
-  if (name) {
-    copyTV(L, L->top, o);
-    incr_top(L);
+  if (ar) {
+    TValue *o = debug_localname(L, ar, &name, (BCReg)n);
+    if (name) {
+      copyTV(L, L->top, o);
+      incr_top(L);
+    }
+  } else if (tvisfunc(L->top-1) && isluafunc(funcV(L->top-1))) {
+    name = debug_varname(funcproto(funcV(L->top-1)), 0, (BCReg)n-1);
   }
   return name;
 }