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/*

** $Id: ldo.h,v 2.18 2009/12/17 12:28:57 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 (L->stack_last - L->top <= (n)) \

				    luaD_growstack(L, n); else condmovestack(L);

#define incr_top(L) {L->top++; luaD_checkstack(L,0);}

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

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

/* 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_hook (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,

                                        int allowyield);

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_reallocstack (lua_State *L, int newsize);

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

LUAI_FUNC void luaD_shrinkstack (lua_State *L);

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

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

#endif