lfunc.h

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/*
** $Id: lfunc.h,v 2.15.1.1 2017/04/19 17:39:34 roberto Exp $
** Auxiliary functions to manipulate prototypes and closures
** See Copyright Notice in lua.h
*/

#ifndef lfunc_h
#define lfunc_h


#include "lobject.h"


#define sizeCclosure(n) (cast(int, sizeof(CClosure)) + \
 cast(int, sizeof(TValue)*((n)-1)))

#define sizeLclosure(n) (cast(int, sizeof(LClosure)) + \
 cast(int, sizeof(TValue *)*((n)-1)))


/* test whether thread is in 'twups' list */
#define isintwups(L) (L->twups != L)


/*
** maximum number of upvalues in a closure (both C and Lua). (Value
** must fit in a VM register.)
*/
#define MAXUPVAL 255


/*
** Upvalues for Lua closures
*/
struct UpVal {
 TValue *v; /* points to stack or to its own value */
 lu_mem refcount; /* reference counter */
 union {
 struct { /* (when open) */
 UpVal *next; /* linked list */
 int touched; /* mark to avoid cycles with dead threads */
 } open;
 TValue value; /* the value (when closed) */
 } u;
};

#define upisopen(up) ((up)->v != &(up)->u.value)


LUAI_FUNC Proto *luaF_newproto (lua_State *L);
LUAI_FUNC CClosure *luaF_newCclosure (lua_State *L, int nelems);
LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nelems);
LUAI_FUNC void luaF_initupvals (lua_State *L, LClosure *cl);
LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);
LUAI_FUNC void luaF_close (lua_State *L, StkId level);
LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);
LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,
 int pc);


#endif