Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1 | // Copyright 2011 the V8 project authors. All rights reserved. |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include <math.h> |
| 29 | |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 30 | #include "../include/v8stdint.h" |
| 31 | #include "checks.h" |
| 32 | #include "utils.h" |
| 33 | |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 34 | #include "dtoa.h" |
| 35 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 36 | #include "bignum-dtoa.h" |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 37 | #include "double.h" |
| 38 | #include "fast-dtoa.h" |
| 39 | #include "fixed-dtoa.h" |
| 40 | |
| 41 | namespace v8 { |
| 42 | namespace internal { |
| 43 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 44 | static BignumDtoaMode DtoaToBignumDtoaMode(DtoaMode dtoa_mode) { |
| 45 | switch (dtoa_mode) { |
| 46 | case DTOA_SHORTEST: return BIGNUM_DTOA_SHORTEST; |
| 47 | case DTOA_FIXED: return BIGNUM_DTOA_FIXED; |
| 48 | case DTOA_PRECISION: return BIGNUM_DTOA_PRECISION; |
| 49 | default: |
| 50 | UNREACHABLE(); |
| 51 | return BIGNUM_DTOA_SHORTEST; // To silence compiler. |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | |
| 56 | void DoubleToAscii(double v, DtoaMode mode, int requested_digits, |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 57 | Vector<char> buffer, int* sign, int* length, int* point) { |
| 58 | ASSERT(!Double(v).IsSpecial()); |
| 59 | ASSERT(mode == DTOA_SHORTEST || requested_digits >= 0); |
| 60 | |
| 61 | if (Double(v).Sign() < 0) { |
| 62 | *sign = 1; |
| 63 | v = -v; |
| 64 | } else { |
| 65 | *sign = 0; |
| 66 | } |
| 67 | |
| 68 | if (v == 0) { |
| 69 | buffer[0] = '0'; |
| 70 | buffer[1] = '\0'; |
| 71 | *length = 1; |
| 72 | *point = 1; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 73 | return; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | if (mode == DTOA_PRECISION && requested_digits == 0) { |
| 77 | buffer[0] = '\0'; |
| 78 | *length = 0; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 79 | return; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 80 | } |
| 81 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 82 | bool fast_worked; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 83 | switch (mode) { |
| 84 | case DTOA_SHORTEST: |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 85 | fast_worked = FastDtoa(v, FAST_DTOA_SHORTEST, 0, buffer, length, point); |
| 86 | break; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 87 | case DTOA_FIXED: |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 88 | fast_worked = FastFixedDtoa(v, requested_digits, buffer, length, point); |
| 89 | break; |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 90 | case DTOA_PRECISION: |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 91 | fast_worked = FastDtoa(v, FAST_DTOA_PRECISION, requested_digits, |
| 92 | buffer, length, point); |
| 93 | break; |
| 94 | default: |
| 95 | UNREACHABLE(); |
| 96 | fast_worked = false; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 97 | } |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 98 | if (fast_worked) return; |
| 99 | |
| 100 | // If the fast dtoa didn't succeed use the slower bignum version. |
| 101 | BignumDtoaMode bignum_mode = DtoaToBignumDtoaMode(mode); |
| 102 | BignumDtoa(v, bignum_mode, requested_digits, buffer, length, point); |
| 103 | buffer[*length] = '\0'; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | } } // namespace v8::internal |