/usr/include/mongo/platform/bits.h is in mongodb-dev 1:2.4.9-1ubuntu2.
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 59 60 | // bits.h
/* Copyright 2012 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
// figure out if we're on a 64 or 32 bit system
#if defined(__x86_64__) || defined(__amd64__) || defined(_WIN64) || defined(__aarch64__) || defined(__powerpc64__)
#define MONGO_PLATFORM_64
#elif defined(__i386__) || defined(_WIN32) || defined(__arm__)
#define MONGO_PLATFORM_32
#else
#error "unknown platform"
#endif
namespace mongo {
// defined here so can test on linux
inline int mongo_firstBitSet( unsigned long long v ) {
if ( v == 0 )
return 0;
for ( int i = 0; i<8; i++ ) {
unsigned long long x = ( v >> ( 8 * i ) ) & 0xFF;
if ( x == 0 )
continue;
for ( int j = 0; j < 8; j++ ) {
if ( ( x >> j ) & 0x1 )
return ( i * 8 ) + j + 1;
}
}
return 0;
}
}
#if defined(__linux__)
#define firstBitSet ffsll
#define MONGO_SYSTEM_FFS 1
#elif defined(__MACH__) && defined(MONGO_PLATFORM_64)
#define firstBitSet ffsl
#define MONGO_SYSTEM_FFS 1
#else
#define firstBitSet mongo::mongo_firstBitSet
#endif
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