Merge v8converions with conversions

src/v8conversions.h

-// Copyright 2011 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_V8CONVERSIONS_H_
-#define V8_V8CONVERSIONS_H_
-
-#include "conversions.h"
-
-namespace v8 {
-namespace internal {
-
-
-static inline bool IsMinusZero(double value) {
-  static const DoubleRepresentation minus_zero(-0.0);
-  return DoubleRepresentation(value) == minus_zero;
-}
-
-
-// Integer32 is an integer that can be represented as a signed 32-bit
-// 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));
-}
-
-
-// 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());
-}
-
-
-double StringToDouble(UnicodeCache* unicode_cache,
-                      String* string,
-                      int flags,
-                      double empty_string_val = 0.0);
-
-
-inline bool TryNumberToSize(Isolate* isolate,
-                            Object* number, size_t* result) {
-  SealHandleScope shs(isolate);
-  if (number->IsSmi()) {
-    int value = Smi::cast(number)->value();
-    ASSERT(static_cast<unsigned>(Smi::kMaxValue)
-           <= std::numeric_limits<size_t>::max());
-    if (value >= 0) {
-      *result = static_cast<size_t>(value);
-      return true;
-    }
-    return false;
-  } else {
-    ASSERT(number->IsHeapNumber());
-    double value = HeapNumber::cast(number)->value();
-    if (value >= 0 &&
-        value <= std::numeric_limits<size_t>::max()) {
-      *result = static_cast<size_t>(value);
-      return true;
-    } else {
-      return false;
-    }
-  }
-}
-
-// Converts a number into size_t.
-inline size_t NumberToSize(Isolate* isolate,
-                           Object* number) {
-  size_t result = 0;
-  bool is_valid = TryNumberToSize(isolate, number, &result);
-  CHECK(is_valid);
-  return result;
-}
-
-} }  // namespace v8::internal
-
-#endif  // V8_V8CONVERSIONS_H_