#include "ikarus-data.h"

ikp
ikrt_weak_cons(ikp a, ikp d, ikpcb* pcb){
  ikp ap = pcb->weak_pairs_ap;
  ikp nap = ap + pair_size;
  ikp p;
  if(nap > pcb->weak_pairs_ep){
    ikp mem = ik_mmap_typed(pagesize, weak_pairs_mt, pcb);
    pcb->weak_pairs_ap = mem + pair_size;
    pcb->weak_pairs_ep = mem + pagesize;
    p = mem + pair_tag;
  }
  else {
    pcb->weak_pairs_ap = nap;
    p = ap + pair_tag;
  }
  ref(p, off_car) = a;
  ref(p, off_cdr) = d;
  return p;
}

ikp
ikrt_is_weak_pair(ikp x, ikpcb* pcb){
  if(tagof(x) != pair_tag){
    return false_object;
  }
  unsigned int t = pcb->segment_vector[page_index(x)];
  if((t & type_mask) == weak_pairs_type){
    return true_object;
  } else {
    return false_object;
  }
}