30a0a7de43
This issue was raised by Brett Wilson while reviewing my changelist for readability. Craig Silverstein (one of C++ SG maintainers) confirmed that we should declare one namespace per line. Our way of namespaces closing seems not violating style guides (there is no clear agreement on it), so I left it intact. Review URL: http://codereview.chromium.org/115756 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2038 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
118 lines
4.5 KiB
C++
118 lines
4.5 KiB
C++
// Copyright 2006-2008 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_CONVERSIONS_H_
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#define V8_CONVERSIONS_H_
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namespace v8 {
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namespace internal {
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// The fast double-to-int conversion routine does not guarantee
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// rounding towards zero.
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// The result is unspecified if x is infinite or NaN, or if the rounded
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// integer value is outside the range of type int.
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static inline int FastD2I(double x);
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static inline double FastI2D(int x) {
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// There is no rounding involved in converting an integer to a
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// double, so this code should compile to a few instructions without
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// any FPU pipeline stalls.
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return static_cast<double>(x);
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}
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static inline double FastUI2D(unsigned x) {
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// There is no rounding involved in converting an unsigned integer to a
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// double, so this code should compile to a few instructions without
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// any FPU pipeline stalls.
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return static_cast<double>(x);
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}
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// This function should match the exact semantics of ECMA-262 9.4.
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static inline double DoubleToInteger(double x);
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// This function should match the exact semantics of ECMA-262 9.5.
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static inline int32_t DoubleToInt32(double x);
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// This function should match the exact semantics of ECMA-262 9.6.
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static inline uint32_t DoubleToUint32(double x) {
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return static_cast<uint32_t>(DoubleToInt32(x));
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}
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// Returns the value (0 .. 15) of a hexadecimal character c.
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// If c is not a legal hexadecimal character, returns a value < 0.
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int HexValue(uc32 c);
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// Enumeration for allowing octals and ignoring junk when converting
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// strings to numbers.
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enum ConversionFlags {
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NO_FLAGS = 0,
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ALLOW_HEX = 1,
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ALLOW_OCTALS = 2,
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ALLOW_TRAILING_JUNK = 4
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};
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// Convert from Number object to C integer.
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static inline int32_t NumberToInt32(Object* number);
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static inline uint32_t NumberToUint32(Object* number);
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// Converts a string into a double value according to ECMA-262 9.3.1
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double StringToDouble(const char* str, int flags, double empty_string_val = 0);
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double StringToDouble(String* str, int flags, double empty_string_val = 0);
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// Converts a string into an integer.
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int StringToInt(String* str, int index, int radix, double* value);
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int StringToInt(const char* str, int index, int radix, double* value);
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// Converts a double to a string value according to ECMA-262 9.8.1.
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// The buffer should be large enough for any floating point number.
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// 100 characters is enough.
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const char* DoubleToCString(double value, Vector<char> buffer);
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// Convert an int to a null-terminated string. The returned string is
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// located inside the buffer, but not necessarily at the start.
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const char* IntToCString(int n, Vector<char> buffer);
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// Additional number to string conversions for the number type.
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// The caller is responsible for calling free on the returned pointer.
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char* DoubleToFixedCString(double value, int f);
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char* DoubleToExponentialCString(double value, int f);
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char* DoubleToPrecisionCString(double value, int f);
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char* DoubleToRadixCString(double value, int radix);
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} } // namespace v8::internal
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#endif // V8_CONVERSIONS_H_
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