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+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_HYDROGEN_RANGE_ANALYSIS_H_
+#define V8_HYDROGEN_RANGE_ANALYSIS_H_
+
+#include "hydrogen.h"
+
+namespace v8 {
+namespace internal {
+
+
+class HRangeAnalysisPhase : public HPhase {
+ public:
+  explicit HRangeAnalysisPhase(HGraph* graph)
+      : HPhase("H_Range analysis", graph), changed_ranges_(16, zone()) { }
+
+  void Run() {
+    Analyze(graph()->entry_block());
+  }
+
+ private:
+  void TraceRange(const char* msg, ...);
+  void Analyze(HBasicBlock* block);
+  void InferControlFlowRange(HCompareIDAndBranch* test, HBasicBlock* dest);
+  void UpdateControlFlowRange(Token::Value op, HValue* value, HValue* other);
+  void InferRange(HValue* value);
+  void RollBackTo(int index);
+  void AddRange(HValue* value, Range* range);
+
+  ZoneList<HValue*> changed_ranges_;
+};
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_HYDROGEN_RANGE_ANALYSIS_H_