/*
** $Id: ldo.h,v 2.29 2015/12/21 13:02:14 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"


/*
** Macro to check stack size and grow stack if needed.  Parameters
** 'pre'/'pos' allow the macro to preserve a pointer into the
** stack across reallocations, doing the work only when needed.
** 'condmovestack' is used in heavy tests to force a stack reallocation
** at every check.
*/
#define luaD_checkstackaux(L,n,pre,pos)  \
	if (L->stack_last - L->top <= (n)) \
	  { pre; luaD_growstack(L, n); pos; } else { condmovestack(L,pre,pos); }

/* In general, 'pre'/'pos' are empty (nothing to save) */
#define luaD_checkstack(L,n)	luaD_checkstackaux(L,n,(void)0,(void)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,
                                   const char* mode);
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);
LUAI_FUNC void luaD_callnoyield(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, CallInfo* ci, StkId firstResult,
                           int nres);
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_inctop(lua_State* L);

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

#endif