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 */
35 struct 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 
50 LUAI_FUNC Proto *luaF_newproto (lua_State *L);
51 LUAI_FUNC CClosure *luaF_newCclosure (lua_State *L, int nelems);
52 LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nelems);
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_close (lua_State *L, StkId level);
56 LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);
57 LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,
58                                          int pc);
59 
60 
61 #endif
62