// 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. #include <cmath> #include "../include/v8stdint.h" #include "checks.h" #include "utils.h" #include "dtoa.h" #include "bignum-dtoa.h" #include "double.h" #include "fast-dtoa.h" #include "fixed-dtoa.h" namespace v8 { namespace internal { static BignumDtoaMode DtoaToBignumDtoaMode(DtoaMode dtoa_mode) { switch (dtoa_mode) { case DTOA_SHORTEST: return BIGNUM_DTOA_SHORTEST; case DTOA_FIXED: return BIGNUM_DTOA_FIXED; case DTOA_PRECISION: return BIGNUM_DTOA_PRECISION; default: UNREACHABLE(); return BIGNUM_DTOA_SHORTEST; // To silence compiler. } } void DoubleToAscii(double v, DtoaMode mode, int requested_digits, Vector<char> buffer, int* sign, int* length, int* point) { ASSERT(!Double(v).IsSpecial()); ASSERT(mode == DTOA_SHORTEST || requested_digits >= 0); if (Double(v).Sign() < 0) { *sign = 1; v = -v; } else { *sign = 0; } if (v == 0) { buffer[0] = '0'; buffer[1] = '\0'; *length = 1; *point = 1; return; } if (mode == DTOA_PRECISION && requested_digits == 0) { buffer[0] = '\0'; *length = 0; return; } bool fast_worked; switch (mode) { case DTOA_SHORTEST: fast_worked = FastDtoa(v, FAST_DTOA_SHORTEST, 0, buffer, length, point); break; case DTOA_FIXED: fast_worked = FastFixedDtoa(v, requested_digits, buffer, length, point); break; case DTOA_PRECISION: fast_worked = FastDtoa(v, FAST_DTOA_PRECISION, requested_digits, buffer, length, point); break; default: UNREACHABLE(); fast_worked = false; } if (fast_worked) return; // If the fast dtoa didn't succeed use the slower bignum version. BignumDtoaMode bignum_mode = DtoaToBignumDtoaMode(mode); BignumDtoa(v, bignum_mode, requested_digits, buffer, length, point); buffer[*length] = '\0'; } } } // namespace v8::internal