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** $Id: ldo.h,v 2.7 2005/08/24 16:15:49 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);


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