/*

** $Id: ldo.h,v 2.29.1.1 2017/04/19 17:20:42 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