1/*
2** $Id: lfunc.h,v 2.15.1.1 2017/04/19 17:39:34 roberto Exp $
3** Auxiliary functions to manipulate prototypes and closures
4** See Copyright Notice in lua.h
5*/
6
7#ifndef lfunc_h
8#define lfunc_h
9
10
11#include "lobject.h"
12
13
14#define sizeCclosure(n)	(cast(int, sizeof(CClosure)) + \
15                         cast(int, sizeof(TValue)*((n)-1)))
16
17#define sizeLclosure(n)	(cast(int, sizeof(LClosure)) + \
18                         cast(int, sizeof(TValue *)*((n)-1)))
19
20
21/* test whether thread is in 'twups' list */
22#define isintwups(L)	(L->twups != L)
23
24
25/*
26** maximum number of upvalues in a closure (both C and Lua). (Value
27** must fit in a VM register.)
28*/
29#define MAXUPVAL	255
30
31
32/*
33** Upvalues for Lua closures
34*/
35struct UpVal {
36  TValue *v;  /* points to stack or to its own value */
37  lu_mem refcount;  /* reference counter */
38  union {
39    struct {  /* (when open) */
40      UpVal *next;  /* linked list */
41      int touched;  /* mark to avoid cycles with dead threads */
42    } open;
43    TValue value;  /* the value (when closed) */
44  } u;
45};
46
47#define upisopen(up)	((up)->v != &(up)->u.value)
48
49
50LUAI_FUNC Proto *luaF_newproto (lua_State *L);
51LUAI_FUNC CClosure *luaF_newCclosure (lua_State *L, int nelems);
52LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nelems);
53LUAI_FUNC void luaF_initupvals (lua_State *L, LClosure *cl);
54LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);
55LUAI_FUNC void luaF_close (lua_State *L, StkId level);
56LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);
57LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,
58                                         int pc);
59
60
61#endif
62