func (ex *Examiner) entryFromIdx(idx int) *dwarf.Entry {
	if idx >= len(ex.dies) || idx < 0 {
		return nil
	}
	return ex.dies[idx]
}

// Returns a list of child entries for a die with ID 'idx'
func (ex *Examiner) Children(idx int) []*dwarf.Entry {
	sl := ex.kids[idx]
	ret := make([]*dwarf.Entry, len(sl))
	for i, k := range sl {
		ret[i] = ex.entryFromIdx(k)
	}
	return ret
}