Index: tools/clang/blink_gc_plugin/TracingStatus.h |
diff --git a/tools/clang/blink_gc_plugin/TracingStatus.h b/tools/clang/blink_gc_plugin/TracingStatus.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..9eb1080de85d13845a910530b559d739883ebe6b |
--- /dev/null |
+++ b/tools/clang/blink_gc_plugin/TracingStatus.h |
@@ -0,0 +1,29 @@ |
+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef TOOLS_BLINK_GC_PLUGIN_TRACING_STATUS_H_ |
+#define TOOLS_BLINK_GC_PLUGIN_TRACING_STATUS_H_ |
+ |
+// TracingStatus is a three-point value ordered by unneeded < unknown < needed. |
+class TracingStatus { |
+ public: |
+ static TracingStatus Unneeded() { return kUnneeded; } |
+ static TracingStatus Unknown() { return kUnknown; } |
+ static TracingStatus Needed() { return kNeeded; } |
+ bool IsUnneeded() const { return status_ == kUnneeded; } |
+ bool IsUnknown() const { return status_ == kUnknown; } |
+ bool IsNeeded() const { return status_ == kNeeded; } |
+ TracingStatus LUB(const TracingStatus& other) const { |
+ return status_ > other.status_ ? status_ : other.status_; |
+ } |
+ bool operator==(const TracingStatus& other) const { |
+ return status_ == other.status_; |
+ } |
+ private: |
+ enum Status { kUnneeded, kUnknown, kNeeded }; |
+ TracingStatus(Status status) : status_(status) {} |
+ Status status_; |
+}; |
+ |
+#endif // TOOLS_BLINK_GC_PLUGIN_TRACING_STATUS_H_ |