Various extensions to types

src/conversions.h

 // Copyright 2011 the V8 project 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 V8_CONVERSIONS_H_
 #define V8_CONVERSIONS_H_
 
 #include <limits>
 
 #include "checks.h"
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 // integer. It has to be in the range [-2^31, 2^31 - 1].
 // We also have to check for negative 0 as it is not an Integer32.
 static inline bool IsInt32Double(double value) {
   return !IsMinusZero(value) &&
          value >= kMinInt &&
          value <= kMaxInt &&
          value == FastI2D(FastD2I(value));
 }
 
 
+// UInteger32 is an integer that can be represented as an unsigned 32-bit
+// integer. It has to be in the range [0, 2^32 - 1].
+// We also have to check for negative 0 as it is not a UInteger32.
+static inline bool IsUint32Double(double value) {
+  return !IsMinusZero(value) &&
+         value >= 0 &&
+         value <= kMaxUInt32 &&
+         value == FastUI2D(FastD2UI(value));
+}
+
+
 // Convert from Number object to C integer.
 inline int32_t NumberToInt32(Object* number) {
   if (number->IsSmi()) return Smi::cast(number)->value();
   return DoubleToInt32(number->Number());
 }
 
 
 inline uint32_t NumberToUint32(Object* number) {
   if (number->IsSmi()) return Smi::cast(number)->value();
   return DoubleToUint32(number->Number());
@@ skipping 36 matching lines @@
                            Object* number) {
   size_t result = 0;
   bool is_valid = TryNumberToSize(isolate, number, &result);
   CHECK(is_valid);
   return result;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONVERSIONS_H_