blob: 5a4206f1ae3a5501d037cb8075f64062cde8a2e5 [file] [log] [blame]
** $Id: lapi.h $
** Auxiliary functions from Lua API
** See Copyright Notice in lua.h
#ifndef lapi_h
#define lapi_h
#include "llimits.h"
#include "lstate.h"
#define api_incr_top(L) {L->top++; api_check(L, L->top <= L->ci->top, \
"stack overflow");}
#define adjustresults(L,nres) \
{ if ((nres) <= LUA_MULTRET && L->ci->top < L->top) L->ci->top = L->top; }
#define api_checknelems(L,n) api_check(L, (n) < (L->top - L->ci->func), \
"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)
#define codeNresults(n) (-(n) - 3)