lua/include/ldo.h

   1 /*
   2 ** $Id: ldo.h,v 2.29.1.1 2017/04/19 17:20:42 roberto Exp $
   3 ** Stack and Call structure of Lua
   4 ** See Copyright Notice in lua.h
   5 */
   6
   7 #ifndef ldo_h
   8 #define ldo_h
   9
  10
  11 #include "lobject.h"
  12 #include "lstate.h"
  13 #include "lzio.h"
  14
  15
  16 /*
  17 ** Macro to check stack size and grow stack if needed.  Parameters
  18 ** 'pre'/'pos' allow the macro to preserve a pointer into the
  19 ** stack across reallocations, doing the work only when needed.
  20 ** 'condmovestack' is used in heavy tests to force a stack reallocation
  21 ** at every check.
  22 */
  23 #define luaD_checkstackaux(L,n,pre,pos)  \
  24         if (L->stack_last - L->top <= (n)) \
  25           { pre; luaD_growstack(L, n); pos; } else { condmovestack(L,pre,pos); }
  26
  27 /* In general, 'pre'/'pos' are empty (nothing to save) */
  28 #define luaD_checkstack(L,n)    luaD_checkstackaux(L,n,(void)0,(void)0)
  29
  30
  31
  32 #define savestack(L,p)          ((char *)(p) - (char *)L->stack)
  33 #define restorestack(L,n)       ((TValue *)((char *)L->stack + (n)))
  34
  35
  36 /* type of protected functions, to be ran by 'runprotected' */
  37 typedef void (*Pfunc) (lua_State *L, void *ud);
  38
  39 LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name,
  40                                                   const char *mode);
  41 LUAI_FUNC void luaD_hook (lua_State *L, int event, int line);
  42 LUAI_FUNC int luaD_precall (lua_State *L, StkId func, int nresults);
  43 LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);
  44 LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults);
  45 LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
  46                                         ptrdiff_t oldtop, ptrdiff_t ef);
  47 LUAI_FUNC int luaD_poscall (lua_State *L, CallInfo *ci, StkId firstResult,
  48                                           int nres);
  49 LUAI_FUNC void luaD_reallocstack (lua_State *L, int newsize);
  50 LUAI_FUNC void luaD_growstack (lua_State *L, int n);
  51 LUAI_FUNC void luaD_shrinkstack (lua_State *L);
  52 LUAI_FUNC void luaD_inctop (lua_State *L);
  53
  54 LUAI_FUNC l_noret luaD_throw (lua_State *L, int errcode);
  55 LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
  56
  57 #endif
  58