1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef TOOLS_BLINK_GC_PLUGIN_TRACING_STATUS_H_
6#define TOOLS_BLINK_GC_PLUGIN_TRACING_STATUS_H_
7
8// TracingStatus is a three-point value ordered by unneeded < unknown < needed.
9class TracingStatus {
10 public:
11  static TracingStatus Unneeded() { return kUnneeded; }
12  static TracingStatus Unknown() { return kUnknown; }
13  static TracingStatus Needed() { return kNeeded; }
14  bool IsUnneeded() const { return status_ == kUnneeded; }
15  bool IsUnknown() const { return status_ == kUnknown; }
16  bool IsNeeded() const { return status_ == kNeeded; }
17  TracingStatus LUB(const TracingStatus& other) const {
18    return status_ > other.status_ ? status_ : other.status_;
19  }
20  bool operator==(const TracingStatus& other) const {
21    return status_ == other.status_;
22  }
23 private:
24  enum Status { kUnneeded, kUnknown, kNeeded };
25  TracingStatus(Status status) : status_(status) {}
26  Status status_;
27};
28
29#endif // TOOLS_BLINK_GC_PLUGIN_TRACING_STATUS_H_
30