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// 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-(unsigned-)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) {
// The static_cast convertion from double to int used to be slow, but
// as new benchmarks show, now it is much faster than lrint().
return static_cast<int>(x);
}
static inline unsigned int FastD2UI(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(String* str, int flags, double empty_string_val = 0);
double StringToDouble(Vector<const char> str,
int flags,
double empty_string_val = 0);
// This version expects a zero-terminated character array.
double StringToDouble(const char* str, int flags, double empty_string_val = 0);
// Converts a string into an integer.
double StringToInt(String* str, int radix);
// 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_
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