Index: tools/clang/blink_gc_plugin/NeedsTracing.h |
diff --git a/tools/clang/blink_gc_plugin/NeedsTracing.h b/tools/clang/blink_gc_plugin/NeedsTracing.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..cf4c2c1f70af54aaa0bee4814cb50045c8613ea0 |
--- /dev/null |
+++ b/tools/clang/blink_gc_plugin/NeedsTracing.h |
@@ -0,0 +1,31 @@ |
+// 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. |
+ |
+// NeedsTracing is a three-point value ordered by unneeded < unknown < needed. |
+// Unneeded means that the point definitively does not need to be traced. |
+ |
+#ifndef TOOLS_BLINK_GC_PLUGIN_NEEDS_TRACING_H_ |
+#define TOOLS_BLINK_GC_PLUGIN_NEEDS_TRACING_H_ |
+ |
+class NeedsTracing { |
+ public: |
+ static NeedsTracing Unneeded() { return kUnneeded; } |
+ static NeedsTracing Unknown() { return kUnknown; } |
+ static NeedsTracing Needed() { return kNeeded; } |
+ bool IsUnneeded() { return value_ == kUnneeded; } |
+ bool IsUnknown() { return value_ == kUnknown; } |
+ bool IsNeeded() { return value_ == kNeeded; } |
+ NeedsTracing LUB(const NeedsTracing& other) { |
+ return value_ > other.value_ ? value_ : other.value_; |
+ } |
+ bool operator==(const NeedsTracing& other) { |
+ return value_ == other.value_; |
+ } |
+ private: |
+ enum Value { kUnneeded, kUnknown, kNeeded }; |
+ NeedsTracing(Value value) : value_(value) {} |
+ Value value_; |
+}; |
+ |
+#endif // TOOLS_BLINK_GC_PLUGIN_NEEDS_TRACING_H_ |