Show HN: Woe – A concatenative language inspired by Joy

I'm posting this old project for curiosity's sake. The repository offers no help at all to understand what's going on, but I'm happy to respond to any question I can remember the answer to!

The language is semantically inspired by Joy and Lisp, but with more of a Factor (and Forth) feel. It's written in Whitney-style C, which I'm sure many will object to. But like, here's the GC:

  Z V gc(E e){
    S r;N t;H h,o;e->g=1;o=e->dh;e->dh=h=nh(e->dh->s);r=h->d;
    cp(e,1,&e->d);cp(e,1,&e->c); /* roots  */
    while(r<(h->d+h->u)){        /* cheney */
      t=(N)r;if(t->t==N_Q){cp(e,1,&t->v.q);}cp(e,1,&t->n);r+=ln(t);
    }e->g=0;free(o->d);free(o);
  }