*
   * <p>This must be a (2^n)-1 as it is used as a mask.
   */
  static final int DRAIN_THRESHOLD = 0x3F;

  /**
   * Maximum number of entries to be drained in a single cleanup run. This applies independently to
   * the cleanup queue and both reference queues.
   */
  // TODO(fry): empirically optimize this
  static final int DRAIN_MAX = 16;

  // Fields

  /**

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	if visited[dtype] {
		return
	}
	visited[dtype] = true
	switch dt := dtype.(type) {
	case *dwarf.TypedefType:
		if strings.HasPrefix(dt.Name, "__builtin") {
			// Don't look inside builtin types. There be dragons.
			return
		}
		if !p.typedefs[dt.Name] {
			p.typedefs[dt.Name] = true
			p.typedefList = append(p.typedefList, typedefInfo{dt.Name, pos})
			p.recordTypedefs1(dt.Type, pos, visited)
		}