ldo.h

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/*
** $Id: ldo.h 2345 2008-10-10 11:52:25Z haraldkipp $
** Stack and Call structure of Lua
** See Copyright Notice in lua.h
*/

#ifndef ldo_h
#define ldo_h


#include <lua/lobject.h>
#include <lua/lstate.h>
#include <lua/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