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  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.