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