/usr/include/js-17.0/ds/BitArray.h is in libmozjs-17.0-dev 17.0.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=99 ft=cpp:
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef BitArray_h__
#define BitArray_h__
#include "jstypes.h"
#include "js/TemplateLib.h"
namespace js {
template <size_t nbits>
class BitArray {
private:
uintptr_t map[nbits / JS_BITS_PER_WORD + (nbits % JS_BITS_PER_WORD == 0 ? 0 : 1)];
public:
void clear(bool value) {
if (value)
memset(map, 0xFF, sizeof(map));
else
memset(map, 0, sizeof(map));
}
inline bool get(size_t offset) const {
uintptr_t index, mask;
getMarkWordAndMask(offset, &index, &mask);
return map[index] & mask;
}
inline void set(size_t offset) {
uintptr_t index, mask;
getMarkWordAndMask(offset, &index, &mask);
map[index] |= mask;
}
inline void unset(size_t offset) {
uintptr_t index, mask;
getMarkWordAndMask(offset, &index, &mask);
map[index] &= ~mask;
}
private:
inline void getMarkWordAndMask(size_t offset,
uintptr_t *indexp, uintptr_t *maskp) const {
*indexp = offset >> tl::FloorLog2<JS_BITS_PER_WORD>::result;
*maskp = uintptr_t(1) << (offset & (JS_BITS_PER_WORD - 1));
}
};
} /* namespace js */
#endif
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