/*

** $Id: ldo.h,v 2.7.1.1 2007/12/27 13:02:25 roberto Exp $

** Stack and Call structure of Lua

** See Copyright Notice in lua.h

*/

#ifndef ldo_h

#define ldo_h

#include "lobject.h"

#include "lstate.h"

#include "lzio.h"

#define luaD_checkstack(L,n)    \

  if ((char *)L->stack_last - (char *)L->top <= (n)*(int)sizeof(TValue)) \

    luaD_growstack(L, n); \

  else condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1));

#define incr_top(L) {luaD_checkstack(L,1); L->top++;}

#define savestack(L,p)      ((char *)(p) - (char *)L->stack)

#define restorestack(L,n)   ((TValue *)((char *)L->stack + (n)))

#define saveci(L,p)     ((char *)(p) - (char *)L->base_ci)

#define restoreci(L,n)      ((CallInfo *)((char *)L->base_ci + (n)))

/* results from luaD_precall */

#define PCRLUA      0   /* initiated a call to a Lua function */

#define PCRC        1   /* did a call to a C function */

#define PCRYIELD    2   /* C funtion yielded */

/* type of protected functions, to be ran by `runprotected' */

typedef void (*Pfunc) (lua_State *L, void *ud);

LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name);

LUAI_FUNC void luaD_callhook (lua_State *L, int event, int line);

LUAI_FUNC int luaD_precall (lua_State *L, StkId func, int nresults);

LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);

LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,

                                        ptrdiff_t oldtop, ptrdiff_t ef);

LUAI_FUNC int luaD_poscall (lua_State *L, StkId firstResult);

LUAI_FUNC void luaD_reallocCI (lua_State *L, int newsize);

LUAI_FUNC void luaD_reallocstack (lua_State *L, int newsize);

LUAI_FUNC void luaD_growstack (lua_State *L, int n);

LUAI_FUNC void luaD_throw (lua_State *L, int errcode);

LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);

LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);

#endif