1 /* 2 ** $Id: lfunc.h,v 2.15 2015/01/13 15:49:11 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