tools/clang/blink_gc_plugin/TracingStatus.h

   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.
   9 class 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_