#define USER_ENV 16

#define STDIN_ENV      0
#define STDOUT_ENV     1
#define STDERR_ENV     2
#define NAMESTACK_ENV  3 /* used by library only */
#define GLOBAL_ENV     4
#define BREAK_ENV      5
#define CATCHSTACK_ENV 6 /* used by library only */
#define CPU_ENV        7
#define BOOT_ENV       8
#define RUNQUEUE_ENV   9 /* used by library only */
#define ARGS_ENV       10
#define OS_ENV         11

/* Profiling timer */
#ifndef WIN32
struct itimerval prof_timer;
#endif

/* Error handlers restore this */
#ifdef WIN32
jmp_buf toplevel;
#else
sigjmp_buf toplevel;
#endif

/* TAGGED currently executing quotation */
CELL callframe;

/* raw pointer to currently executing word */
F_WORD* executing;

/* TAGGED user environment data; see getenv/setenv prims */
CELL userenv[USER_ENV];

/* Call stack depth to start profile counter from */
/* This ensures that words in the user's interpreter do not count */
CELL profile_depth;

INLINE CELL dpop(void)
{
	CELL value = get(ds);
	ds -= CELLS;
	return value;
}

INLINE void drepl(CELL top)
{
	put(ds,top);
}

INLINE void dpush(CELL top)
{
	ds += CELLS;
	put(ds,top);
}

INLINE CELL dpeek(void)
{
	return get(ds);
}

INLINE CELL cpop(void)
{
	CELL value = get(cs);
	cs -= CELLS;
	return value;
}

INLINE void cpush(CELL top)
{
	cs += CELLS;
	put(cs,top);
}

INLINE void call(CELL quot)
{
	/* tail call optimization */
	if(callframe != F)
	{
		cpush(tag_word(executing));
		cpush(callframe);
	}
	callframe = quot;
}

void clear_environment(void);

void run(void);
void undefined(void);
void docol(void);
void dosym(void);
void primitive_execute(void);
void primitive_call(void);
void primitive_ifte(void);
void primitive_getenv(void);
void primitive_setenv(void);