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/*

 *      Interface routines assumed by gc()

 *

 *      Copyright (C) Barak A. Pearlmutter.

 *      Released under the GPL version 2 or later.

 *

 */

typedef struct object *pobj;    /* pointer to a guy of the type we gc */

/*

 *      How to mark and unmark objects

 */

extern void gc_mark(pobj);

extern void gc_unmark(pobj);

extern int gc_marked(pobj);

/*

 *      How to count and access an object's children

 */

extern int n_children(pobj);    /* how many children */

extern pobj child_n(pobj, int); /* child i, numbered 0..n-1 */

/*

 *      How to access the root set

 */

extern int root_size(void);     /* number of things in root set */

extern pobj root_elt(int);      /* element i of root set, numbered 0..n-1 */

/*

 *      How to access the free list

 */

extern void clear_freelist(void);

extern void add_to_free_list(pobj);

/*

 *      How to iterate through all objects in memory

 */

extern int N_OBJS;

extern pobj obj_number(int);