- workset_t *res;
- size_t size = sizeof(*res) + (env->n_regs)*sizeof(res->vals[0]);
- res = obstack_alloc(ob, size);
- memcpy(res, ws, size);
+ workset_t *res = OALLOCF(ob, workset_t, vals, env->n_regs);
+ memcpy(res, ws, sizeof(*res) + (env->n_regs)*sizeof(res->vals[0]));