1 files changed, 20 insertions, 1 deletions

diff --git a/ldo.h b/ldo.h
index 4bc75030..b52a353f 100644
--- a/ldo.h
+++ b/ldo.h
@@ -23,10 +23,19 @@
 ** 'condmovestack' is used in heavy tests to force a stack reallocation
 ** at every check.
 */
+
+#if !defined(HARDSTACKTESTS)
+#define condmovestack(L,pre,pos)        ((void)0)
+#else
+/* realloc stack keeping its size */
+#define condmovestack(L,pre,pos)  \
+  { int sz_ = stacksize(L); pre; luaD_reallocstack((L), sz_, 0); pos; }
+#endif
+
 #define luaD_checkstackaux(L,n,pre,pos)  \
         if (l_unlikely(L->stack_last.p - L->top.p <= (n))) \
           { pre; luaD_growstack(L, n, 1); pos; } \
-        else { condmovestack(L,pre,pos); }
+        else { condmovestack(L,pre,pos); }
 
 /* In general, 'pre'/'pos' are empty (nothing to save) */
 #define luaD_checkstack(L,n)    luaD_checkstackaux(L,n,(void)0,(void)0)
@@ -44,6 +53,16 @@
     p = restorestack(L, t__))  /* 'pos' part: restore 'p' */
 
 
+/*
+** Maximum depth for nested C calls, syntactical nested non-terminals,
+** and other features implemented through recursion in C. (Value must
+** fit in a 16-bit unsigned integer. It must also be compatible with
+** the size of the C stack.)
+*/
+#if !defined(LUAI_MAXCCALLS)
+#define LUAI_MAXCCALLS          200
+#endif
+
 
 /* type of protected functions, to be ran by 'runprotected' */
 typedef void (*Pfunc) (lua_State *L, void *ud);