2185   size_t               prev_foot;  /* Size of previous chunk (if free).  */  member
2274 #define prev_chunk(p) ((mchunkptr)( ((char*)(p)) - ((p)->prev_foot) ))
2280 #define get_foot(p, s)  (((mchunkptr)((char*)(p) + (s)))->prev_foot)
2281 #define set_foot(p, s)  (((mchunkptr)((char*)(p) + (s)))->prev_foot = (s))
2395   size_t                    prev_foot;  member
3070   (((mchunkptr)((char*)(p) + (s)))->prev_foot = ((size_t)(M) ^ mparams.magic))
3074     (chunksize(p))))->prev_foot ^ mparams.magic))
3255   size_t len = (sz + (p->prev_foot) + MMAP_FOOT_PAD);  in do_check_mmapped_chunk()
3289       assert(next->prev_foot == sz);  in do_check_free_chunk()
3855       p->prev_foot = offset;  in mmap_alloc()
3884     size_t offset = oldp->prev_foot;  in mmap_resize()
4391     size_t prevsize = p->prev_foot;  in dispose_chunk()
4730           size_t prevsize = p->prev_foot;  in dlfree()
4960           newp->prev_foot = p->prev_foot + leadsize;  in internal_memalign()
5671           size_t prevsize = p->prev_foot;  in mspace_free()