| 1 | /*
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| 2 | * Copyright (C) 1999-2001 Harri Porten ([email protected])
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| 3 | * Copyright (C) 2001 Peter Kelly ([email protected])
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| 4 | * Copyright (C) 2003, 2007, 2008 Apple Inc. All rights reserved.
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the GNU Library General Public
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| 8 | * License as published by the Free Software Foundation; either
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| 9 | * version 2 of the License, or (at your option) any later version.
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| 10 | *
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| 11 | * This library is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | * Library General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU Library General Public License
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| 17 | * along with this library; see the file COPYING.LIB. If not, write to
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| 18 | * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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| 19 | * Boston, MA 02110-1301, USA.
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| 20 | *
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| 21 | */
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| 22 |
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| 23 | #include "config.h"
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| 24 | #include "JSValue.h"
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| 25 |
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| 26 | #include "JSFunction.h"
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| 27 | #include <wtf/MathExtras.h>
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| 28 |
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| 29 | namespace JSC {
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| 30 |
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| 31 | static const double D32 = 4294967296.0;
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| 32 |
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| 33 | // ECMA 9.4
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| 34 | double JSValuePtr::toInteger(ExecState* exec) const
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| 35 | {
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| 36 | if (isInt32Fast())
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| 37 | return getInt32Fast();
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| 38 | double d = toNumber(exec);
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| 39 | return isnan(d) ? 0.0 : trunc(d);
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| 40 | }
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| 41 |
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| 42 | double JSValuePtr::toIntegerPreserveNaN(ExecState* exec) const
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| 43 | {
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| 44 | if (isInt32Fast())
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| 45 | return getInt32Fast();
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| 46 | return trunc(toNumber(exec));
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| 47 | }
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| 48 |
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| 49 | int32_t toInt32SlowCase(double d, bool& ok)
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| 50 | {
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| 51 | ok = true;
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| 52 |
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| 53 | if (d >= -D32 / 2 && d < D32 / 2)
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| 54 | return static_cast<int32_t>(d);
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| 55 |
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| 56 | if (isnan(d) || isinf(d)) {
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| 57 | ok = false;
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| 58 | return 0;
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| 59 | }
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| 60 |
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| 61 | double d32 = fmod(trunc(d), D32);
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| 62 | if (d32 >= D32 / 2)
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| 63 | d32 -= D32;
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| 64 | else if (d32 < -D32 / 2)
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| 65 | d32 += D32;
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| 66 | return static_cast<int32_t>(d32);
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| 67 | }
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| 68 |
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| 69 | uint32_t toUInt32SlowCase(double d, bool& ok)
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| 70 | {
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| 71 | ok = true;
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| 72 |
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| 73 | if (d >= 0.0 && d < D32)
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| 74 | return static_cast<uint32_t>(d);
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| 75 |
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| 76 | if (isnan(d) || isinf(d)) {
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| 77 | ok = false;
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| 78 | return 0;
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| 79 | }
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| 80 |
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| 81 | double d32 = fmod(trunc(d), D32);
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| 82 | if (d32 < 0)
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| 83 | d32 += D32;
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| 84 | return static_cast<uint32_t>(d32);
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| 85 | }
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| 86 |
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| 87 | } // namespace JSC
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