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 != &(up)->u.value)
33 
34 
35 #define uplevel(up)	check_exp(upisopen(up), cast(StkId, (up)->v))
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 
50 LUAI_FUNC Proto *luaF_newproto (lua_State *L);
51 LUAI_FUNC CClosure *luaF_newCclosure (lua_State *L, int nupvals);
52 LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nupvals);
53 LUAI_FUNC void luaF_initupvals (lua_State *L, LClosure *cl);
54 LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);
55 LUAI_FUNC void luaF_newtbcupval (lua_State *L, StkId level);
56 LUAI_FUNC void luaF_closeupval (lua_State *L, StkId level);
57 LUAI_FUNC void luaF_close (lua_State *L, StkId level, int status, int yy);
58 LUAI_FUNC void luaF_unlinkupval (UpVal *uv);
59 LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);
60 LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,
61                                          int pc);
62 
63 
64 #endif
65