Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 1 | // Copyright 2011 the V8 project authors. All rights reserved. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 4 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 5 | #include <cmath> |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 6 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 7 | #include "include/v8stdint.h" |
| 8 | #include "src/base/logging.h" |
| 9 | #include "src/utils.h" |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 10 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 11 | #include "src/dtoa.h" |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 12 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 13 | #include "src/bignum-dtoa.h" |
| 14 | #include "src/double.h" |
| 15 | #include "src/fast-dtoa.h" |
| 16 | #include "src/fixed-dtoa.h" |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 17 | |
| 18 | namespace v8 { |
| 19 | namespace internal { |
| 20 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 21 | static BignumDtoaMode DtoaToBignumDtoaMode(DtoaMode dtoa_mode) { |
| 22 | switch (dtoa_mode) { |
| 23 | case DTOA_SHORTEST: return BIGNUM_DTOA_SHORTEST; |
| 24 | case DTOA_FIXED: return BIGNUM_DTOA_FIXED; |
| 25 | case DTOA_PRECISION: return BIGNUM_DTOA_PRECISION; |
| 26 | default: |
| 27 | UNREACHABLE(); |
| 28 | return BIGNUM_DTOA_SHORTEST; // To silence compiler. |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | |
| 33 | void DoubleToAscii(double v, DtoaMode mode, int requested_digits, |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 34 | Vector<char> buffer, int* sign, int* length, int* point) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 35 | DCHECK(!Double(v).IsSpecial()); |
| 36 | DCHECK(mode == DTOA_SHORTEST || requested_digits >= 0); |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 37 | |
| 38 | if (Double(v).Sign() < 0) { |
| 39 | *sign = 1; |
| 40 | v = -v; |
| 41 | } else { |
| 42 | *sign = 0; |
| 43 | } |
| 44 | |
| 45 | if (v == 0) { |
| 46 | buffer[0] = '0'; |
| 47 | buffer[1] = '\0'; |
| 48 | *length = 1; |
| 49 | *point = 1; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 50 | return; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 51 | } |
| 52 | |
| 53 | if (mode == DTOA_PRECISION && requested_digits == 0) { |
| 54 | buffer[0] = '\0'; |
| 55 | *length = 0; |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 56 | return; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 57 | } |
| 58 | |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 59 | bool fast_worked; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 60 | switch (mode) { |
| 61 | case DTOA_SHORTEST: |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 62 | fast_worked = FastDtoa(v, FAST_DTOA_SHORTEST, 0, buffer, length, point); |
| 63 | break; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 64 | case DTOA_FIXED: |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 65 | fast_worked = FastFixedDtoa(v, requested_digits, buffer, length, point); |
| 66 | break; |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 67 | case DTOA_PRECISION: |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 68 | fast_worked = FastDtoa(v, FAST_DTOA_PRECISION, requested_digits, |
| 69 | buffer, length, point); |
| 70 | break; |
| 71 | default: |
| 72 | UNREACHABLE(); |
| 73 | fast_worked = false; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 74 | } |
Shimeng (Simon) Wang | 8a31eba | 2010-12-06 19:01:33 -0800 | [diff] [blame] | 75 | if (fast_worked) return; |
| 76 | |
| 77 | // If the fast dtoa didn't succeed use the slower bignum version. |
| 78 | BignumDtoaMode bignum_mode = DtoaToBignumDtoaMode(mode); |
| 79 | BignumDtoa(v, bignum_mode, requested_digits, buffer, length, point); |
| 80 | buffer[*length] = '\0'; |
Kristian Monsen | 25f6136 | 2010-05-21 11:50:48 +0100 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | } } // namespace v8::internal |