src/ldo.h

   1 /*
   2 ** $Id: ldo.h,v 1.56 2002/12/04 17:29:32 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 control inclusion of some hard tests on stack reallocation
  18 */
  19 #ifndef HARDSTACKTESTS
  20 #define condhardstacktests(x)   { /* empty */ }
  21 #else
  22 #define condhardstacktests(x)   x
  23 #endif
  24
  25
  26 #define luaD_checkstack(L,n)    \
  27   if ((char *)L->stack_last - (char *)L->top <= (n)*(int)sizeof(TObject)) \
  28     luaD_growstack(L, n); \
  29   else condhardstacktests(luaD_reallocstack(L, L->stacksize));
  30
  31
  32 #define incr_top(L) {luaD_checkstack(L,1); L->top++;}
  33
  34 #define savestack(L,p)          ((char *)(p) - (char *)L->stack)
  35 #define restorestack(L,n)       ((TObject *)((char *)L->stack + (n)))
  36
  37 #define saveci(L,p)             ((char *)(p) - (char *)L->base_ci)
  38 #define restoreci(L,n)          ((CallInfo *)((char *)L->base_ci + (n)))
  39
  40
  41 /* type of protected functions, to be ran by `runprotected' */
  42 typedef void (*Pfunc) (lua_State *L, void *ud);
  43
  44 void luaD_resetprotection (lua_State *L);
  45 int luaD_protectedparser (lua_State *L, ZIO *z, int bin);
  46 void luaD_callhook (lua_State *L, int event, int line);
  47 StkId luaD_precall (lua_State *L, StkId func);
  48 void luaD_call (lua_State *L, StkId func, int nResults);
  49 int luaD_pcall (lua_State *L, Pfunc func, void *u,
  50                 ptrdiff_t oldtop, ptrdiff_t ef);
  51 void luaD_poscall (lua_State *L, int wanted, StkId firstResult);
  52 void luaD_reallocCI (lua_State *L, int newsize);
  53 void luaD_reallocstack (lua_State *L, int newsize);
  54 void luaD_growstack (lua_State *L, int n);
  55
  56 void luaD_throw (lua_State *L, int errcode);
  57 int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
  58
  59
  60 #endif