315b0c6a30
R=rossberg@chromium.org Review URL: https://codereview.chromium.org/105313008 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18389 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
114 lines
3.9 KiB
C++
114 lines
3.9 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_V8CONVERSIONS_H_
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#define V8_V8CONVERSIONS_H_
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#include "conversions.h"
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namespace v8 {
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namespace internal {
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static inline bool IsMinusZero(double value) {
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static const DoubleRepresentation minus_zero(-0.0);
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return DoubleRepresentation(value) == minus_zero;
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}
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// Integer32 is an integer that can be represented as a signed 32-bit
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// integer. It has to be in the range [-2^31, 2^31 - 1].
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// We also have to check for negative 0 as it is not an Integer32.
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static inline bool IsInt32Double(double value) {
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return !IsMinusZero(value) &&
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value >= kMinInt &&
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value <= kMaxInt &&
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value == FastI2D(FastD2I(value));
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}
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// Convert from Number object to C integer.
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inline int32_t NumberToInt32(Object* number) {
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if (number->IsSmi()) return Smi::cast(number)->value();
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return DoubleToInt32(number->Number());
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}
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inline uint32_t NumberToUint32(Object* number) {
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if (number->IsSmi()) return Smi::cast(number)->value();
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return DoubleToUint32(number->Number());
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}
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// Converts a string into a double value according to ECMA-262 9.3.1
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double StringToDouble(UnicodeCache* unicode_cache,
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String* str,
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int flags,
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double empty_string_val = 0);
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// Converts a string into an integer.
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double StringToInt(UnicodeCache* unicode_cache, String* str, int radix);
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inline bool TryNumberToSize(Isolate* isolate,
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Object* number, size_t* result) {
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SealHandleScope shs(isolate);
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if (number->IsSmi()) {
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int value = Smi::cast(number)->value();
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ASSERT(
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static_cast<unsigned>(Smi::kMaxValue)
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<= std::numeric_limits<size_t>::max());
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if (value >= 0) {
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*result = static_cast<size_t>(value);
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return true;
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}
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return false;
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} else {
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ASSERT(number->IsHeapNumber());
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double value = HeapNumber::cast(number)->value();
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if (value >= 0 &&
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value <= std::numeric_limits<size_t>::max()) {
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*result = static_cast<size_t>(value);
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return true;
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} else {
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return false;
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}
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}
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}
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// Converts a number into size_t.
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inline size_t NumberToSize(Isolate* isolate,
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Object* number) {
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size_t result = 0;
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bool is_valid = TryNumberToSize(isolate, number, &result);
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CHECK(is_valid);
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return result;
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}
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} } // namespace v8::internal
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#endif // V8_V8CONVERSIONS_H_
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