Bump LUA version from 5.2 to 5.4

client/deps/liblua/lapi.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.h,v 2.7 2009/11/27 15:37:59 roberto Exp $
+** $Id: lapi.h $
 ** Auxiliary functions from Lua API
 ** See Copyright Notice in lua.h
 */
@@ -11,14 +11,42 @@
 #include "llimits.h"
 #include "lstate.h"
 
-#define api_incr_top(L)   {L->top++; api_check(L, L->top <= L->ci->top, \
-                                                   "stack overflow");}
 
+/* Increments 'L->top.p', checking for stack overflows */
+#define api_incr_top(L)	{L->top.p++; \
+			 api_check(L, L->top.p <= L->ci->top.p, \
+					"stack overflow");}
+
+
+/*
+** If a call returns too many multiple returns, the callee may not have
+** stack space to accommodate all results. In this case, this macro
+** increases its stack space ('L->ci->top.p').
+*/
 #define adjustresults(L,nres) \
-    { if ((nres) == LUA_MULTRET && L->ci->top < L->top) L->ci->top = L->top; }
+    { if ((nres) <= LUA_MULTRET && L->ci->top.p < L->top.p) \
+	L->ci->top.p = L->top.p; }
 
-#define api_checknelems(L,n) api_check(L, (n) < (L->top - L->ci->func), \
-                                       "not enough elements in the stack")
 
+/* Ensure the stack has at least 'n' elements */
+#define api_checknelems(L,n) \
+	api_check(L, (n) < (L->top.p - L->ci->func.p), \
+			  "not enough elements in the stack")
+
+
+/*
+** To reduce the overhead of returning from C functions, the presence of
+** to-be-closed variables in these functions is coded in the CallInfo's
+** field 'nresults', in a way that functions with no to-be-closed variables
+** with zero, one, or "all" wanted results have no overhead. Functions
+** with other number of wanted results, as well as functions with
+** variables to be closed, have an extra check.
+*/
+
+#define hastocloseCfunc(n)	((n) < LUA_MULTRET)
+
+/* Map [-1, inf) (range of 'nresults') into (-inf, -2] */
+#define codeNresults(n)		(-(n) - 3)
+#define decodeNresults(n)	(-(n) - 3)
 
 #endif