update V8 to TOT snapshot branch
diff --git a/src/number-info.h b/src/number-info.h
new file mode 100644
index 0000000..c6f32e4
--- /dev/null
+++ b/src/number-info.h
@@ -0,0 +1,72 @@
+// Copyright 2010 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_NUMBER_INFO_H_
+#define V8_NUMBER_INFO_H_
+
+namespace v8 {
+namespace internal {
+
+class NumberInfo : public AllStatic {
+ public:
+ enum Type {
+ kUnknown = 0,
+ kNumber = 1,
+ kSmi = 3,
+ kHeapNumber = 5,
+ kUninitialized = 7
+ };
+
+ // Return the weakest (least precise) common type.
+ static Type Combine(Type a, Type b) {
+ // Make use of the order of enum values.
+ return static_cast<Type>(a & b);
+ }
+
+ static bool IsNumber(Type a) {
+ ASSERT(a != kUninitialized);
+ return ((a & kNumber) != 0);
+ }
+
+ static const char* ToString(Type a) {
+ switch (a) {
+ case kUnknown: return "UnknownType";
+ case kNumber: return "NumberType";
+ case kSmi: return "SmiType";
+ case kHeapNumber: return "HeapNumberType";
+ case kUninitialized:
+ UNREACHABLE();
+ return "UninitializedType";
+ }
+ UNREACHABLE();
+ return "Unreachable code";
+ }
+};
+
+} } // namespace v8::internal
+
+#endif // V8_NUMBER_INFO_H_