1/*
2** $Id: lfunc.h $
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(offsetof(CClosure, upvalue)) + \
15                         cast_int(sizeof(TValue)) * (n))
16
17#define sizeLclosure(n)	(cast_int(offsetof(LClosure, upvals)) + \
18                         cast_int(sizeof(TValue *)) * (n))
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#define upisopen(up)	((up)->v.p != &(up)->u.value)
33
34
35#define uplevel(up)	check_exp(upisopen(up), cast(StkId, (up)->v.p))
36
37
38/*
39** maximum number of misses before giving up the cache of closures
40** in prototypes
41*/
42#define MAXMISS		10
43
44
45
46/* special status to close upvalues preserving the top of the stack */
47#define CLOSEKTOP	(-1)
48
49
50LUAI_FUNC Proto *luaF_newproto (lua_State *L);
51LUAI_FUNC CClosure *luaF_newCclosure (lua_State *L, int nupvals);
52LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nupvals);
53LUAI_FUNC void luaF_initupvals (lua_State *L, LClosure *cl);
54LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);
55LUAI_FUNC void luaF_newtbcupval (lua_State *L, StkId level);
56LUAI_FUNC void luaF_closeupval (lua_State *L, StkId level);
57LUAI_FUNC StkId luaF_close (lua_State *L, StkId level, int status, int yy);
58LUAI_FUNC void luaF_unlinkupval (UpVal *uv);
59LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);
60LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,
61                                         int pc);
62
63
64#endif
65