CSE2410 Fall 2014 Bounce

// Copyright 2006-2008 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_CONVERSIONS_H_

#define V8_CONVERSIONS_H_

namespace v8 { namespace internal {

// The fast double-to-int conversion routine does not guarantee

// rounding towards zero.

// The result is unspecified if x is infinite or NaN, or if the rounded

// integer value is outside the range of type int.

static inline int FastD2I(double x);

static inline double FastI2D(int x) {

  // There is no rounding involved in converting an integer to a

  // double, so this code should compile to a few instructions without

  // any FPU pipeline stalls.

  return static_cast<double>(x);

}

static inline double FastUI2D(unsigned x) {

  // There is no rounding involved in converting an unsigned integer to a

  // double, so this code should compile to a few instructions without

  // any FPU pipeline stalls.

  return static_cast<double>(x);

}

// This function should match the exact semantics of ECMA-262 9.4.

static inline double DoubleToInteger(double x);

// This function should match the exact semantics of ECMA-262 9.5.

static inline int32_t DoubleToInt32(double x);

// This function should match the exact semantics of ECMA-262 9.6.

static inline uint32_t DoubleToUint32(double x) {

  return static_cast<uint32_t>(DoubleToInt32(x));

}

// Returns the value (0 .. 15) of a hexadecimal character c.

// If c is not a legal hexadecimal character, returns a value < 0.

int HexValue(uc32 c);

// Enumeration for allowing octals and ignoring junk when converting

// strings to numbers.

enum ConversionFlags {

  NO_FLAGS = 0,

  ALLOW_HEX = 1,

  ALLOW_OCTALS = 2,

  ALLOW_TRAILING_JUNK = 4

};

// Convert from Number object to C integer.

static inline int32_t NumberToInt32(Object* number);

static inline uint32_t NumberToUint32(Object* number);

// Converts a string into a double value according to ECMA-262 9.3.1

double StringToDouble(const char* str, int flags, double empty_string_val = 0);

double StringToDouble(String* str, int flags, double empty_string_val = 0);

// Converts a string into an integer.

int StringToInt(String* str, int index, int radix, double* value);

int StringToInt(const char* str, int index, int radix, double* value);

// Converts a double to a string value according to ECMA-262 9.8.1.

// The buffer should be large enough for any floating point number.

// 100 characters is enough.

const char* DoubleToCString(double value, Vector<char> buffer);

// Convert an int to a null-terminated string. The returned string is

// located inside the buffer, but not necessarily at the start.

const char* IntToCString(int n, Vector<char> buffer);

// Additional number to string conversions for the number type.

// The caller is responsible for calling free on the returned pointer.

char* DoubleToFixedCString(double value, int f);

char* DoubleToExponentialCString(double value, int f);

char* DoubleToPrecisionCString(double value, int f);

char* DoubleToRadixCString(double value, int radix);

} }  // namespace v8::internal

#endif  // V8_CONVERSIONS_H_