398 lines
11 KiB
C++
398 lines
11 KiB
C++
/* bitSet.cpp */
|
|
/**
|
|
* Copyright - See the COPYRIGHT that is included with this distribution.
|
|
* EPICS pvDataCPP is distributed subject to a Software License Agreement found
|
|
* in file LICENSE that is included with this distribution.
|
|
*/
|
|
#include "string.h"
|
|
#include "stdio.h"
|
|
#include "bitSet.h"
|
|
#include "lock.h"
|
|
#include "showConstructDestruct.h"
|
|
#include "serializeHelper.h"
|
|
|
|
namespace epics { namespace pvData {
|
|
|
|
//static DebugLevel debugLevel = lowDebug;
|
|
|
|
PVDATA_REFCOUNT_MONITOR_DEFINE(bitSet);
|
|
|
|
BitSet::BitSet() : words(0), wordsLength(0), wordsInUse(0) {
|
|
initWords(BITS_PER_WORD);
|
|
|
|
PVDATA_REFCOUNT_MONITOR_CONSTRUCT(bitSet);
|
|
}
|
|
|
|
BitSet::BitSet(uint32 nbits) : words(0), wordsLength(0), wordsInUse(0) {
|
|
initWords(nbits);
|
|
|
|
PVDATA_REFCOUNT_MONITOR_CONSTRUCT(bitSet);
|
|
}
|
|
|
|
BitSet::~BitSet() {
|
|
delete[] words;
|
|
|
|
PVDATA_REFCOUNT_MONITOR_DESTRUCT(bitSet);
|
|
}
|
|
|
|
void BitSet::initWords(uint32 nbits) {
|
|
uint32 length = (nbits <= 0) ? 1 : wordIndex(nbits-1) + 1;
|
|
if (words) delete[] words;
|
|
words = new uint64[length];
|
|
bzero(words, sizeof(uint64)*length);
|
|
wordsLength = length;
|
|
}
|
|
|
|
void BitSet::recalculateWordsInUse() {
|
|
// wordsInUse is unsigned
|
|
if (wordsInUse == 0)
|
|
return;
|
|
|
|
// Traverse the bitset until a used word is found
|
|
uint32 i;
|
|
for (i = wordsInUse-1; i >= 0; i--)
|
|
if (words[i] != 0)
|
|
break;
|
|
|
|
wordsInUse = i+1; // The new logical size
|
|
}
|
|
|
|
void BitSet::ensureCapacity(uint32 wordsRequired) {
|
|
if (wordsLength < wordsRequired) {
|
|
|
|
// create and copy
|
|
uint64* newwords = new uint64[wordsRequired];
|
|
bzero(newwords, sizeof(uint64)*wordsRequired);
|
|
memcpy(newwords, words, sizeof(uint64)*wordsLength);
|
|
if (words) delete[] words;
|
|
words = newwords;
|
|
wordsLength = wordsRequired;
|
|
}
|
|
}
|
|
|
|
void BitSet::expandTo(uint32 wordIndex) {
|
|
uint32 wordsRequired = wordIndex+1;
|
|
if (wordsInUse < wordsRequired) {
|
|
ensureCapacity(wordsRequired);
|
|
wordsInUse = wordsRequired;
|
|
}
|
|
}
|
|
|
|
void BitSet::flip(uint32 bitIndex) {
|
|
|
|
uint32 wordIdx = wordIndex(bitIndex);
|
|
expandTo(wordIdx);
|
|
|
|
words[wordIdx] ^= (((uint64)1) << (bitIndex % BITS_PER_WORD));
|
|
|
|
recalculateWordsInUse();
|
|
}
|
|
|
|
void BitSet::set(uint32 bitIndex) {
|
|
|
|
uint32 wordIdx = wordIndex(bitIndex);
|
|
expandTo(wordIdx);
|
|
|
|
words[wordIdx] |= (((uint64)1) << (bitIndex % BITS_PER_WORD));
|
|
}
|
|
|
|
void BitSet::clear(uint32 bitIndex) {
|
|
|
|
uint32 wordIdx = wordIndex(bitIndex);
|
|
if (wordIdx >= wordsInUse)
|
|
return;
|
|
|
|
words[wordIdx] &= ~(((uint64)1) << (bitIndex % BITS_PER_WORD));
|
|
|
|
recalculateWordsInUse();
|
|
}
|
|
|
|
void BitSet::set(uint32 bitIndex, bool value) {
|
|
if (value)
|
|
set(bitIndex);
|
|
else
|
|
clear(bitIndex);
|
|
}
|
|
|
|
bool BitSet::get(uint32 bitIndex) const {
|
|
uint32 wordIdx = wordIndex(bitIndex);
|
|
return ((wordIdx < wordsInUse)
|
|
&& ((words[wordIdx] & (((uint64)1) << (bitIndex % BITS_PER_WORD))) != 0));
|
|
}
|
|
|
|
void BitSet::clear() {
|
|
while (wordsInUse > 0)
|
|
words[--wordsInUse] = 0;
|
|
}
|
|
|
|
uint32 BitSet::numberOfTrailingZeros(uint64 i) {
|
|
// HD, Figure 5-14
|
|
uint32 x, y;
|
|
if (i == 0) return 64;
|
|
uint32 n = 63;
|
|
y = (uint32)i; if (y != 0) { n = n -32; x = y; } else x = (uint32)(i>>32);
|
|
y = x <<16; if (y != 0) { n = n -16; x = y; }
|
|
y = x << 8; if (y != 0) { n = n - 8; x = y; }
|
|
y = x << 4; if (y != 0) { n = n - 4; x = y; }
|
|
y = x << 2; if (y != 0) { n = n - 2; x = y; }
|
|
return n - ((x << 1) >> 31);
|
|
}
|
|
|
|
uint32 BitSet::bitCount(uint64 i) {
|
|
// HD, Figure 5-14
|
|
i = i - ((i >> 1) & 0x5555555555555555LL);
|
|
i = (i & 0x3333333333333333LL) + ((i >> 2) & 0x3333333333333333LL);
|
|
i = (i + (i >> 4)) & 0x0f0f0f0f0f0f0f0fLL;
|
|
i = i + (i >> 8);
|
|
i = i + (i >> 16);
|
|
i = i + (i >> 32);
|
|
return (uint32)(i & 0x7f);
|
|
}
|
|
|
|
int32 BitSet::nextSetBit(uint32 fromIndex) const {
|
|
|
|
uint32 u = wordIndex(fromIndex);
|
|
if (u >= wordsInUse)
|
|
return -1;
|
|
|
|
uint64 word = words[u] & (WORD_MASK << (fromIndex % BITS_PER_WORD));
|
|
|
|
while (true) {
|
|
if (word != 0)
|
|
return (u * BITS_PER_WORD) + numberOfTrailingZeros(word);
|
|
if (++u == wordsInUse)
|
|
return -1;
|
|
word = words[u];
|
|
}
|
|
}
|
|
|
|
int32 BitSet::nextClearBit(uint32 fromIndex) const {
|
|
// Neither spec nor implementation handle bitsets of maximal length.
|
|
|
|
uint32 u = wordIndex(fromIndex);
|
|
if (u >= wordsInUse)
|
|
return fromIndex;
|
|
|
|
uint64 word = ~words[u] & (WORD_MASK << (fromIndex % BITS_PER_WORD));
|
|
|
|
while (true) {
|
|
if (word != 0)
|
|
return (u * BITS_PER_WORD) + numberOfTrailingZeros(word);
|
|
if (++u == wordsInUse)
|
|
return wordsInUse * BITS_PER_WORD;
|
|
word = ~words[u];
|
|
}
|
|
}
|
|
|
|
bool BitSet::isEmpty() const {
|
|
return (wordsInUse == 0);
|
|
}
|
|
|
|
uint32 BitSet::cardinality() const {
|
|
uint32 sum = 0;
|
|
for (uint32 i = 0; i < wordsInUse; i++)
|
|
sum += bitCount(words[i]);
|
|
return sum;
|
|
}
|
|
|
|
BitSet& BitSet::operator&=(const BitSet& set) {
|
|
|
|
while (wordsInUse > set.wordsInUse)
|
|
words[--wordsInUse] = 0;
|
|
|
|
// Perform logical AND on words in common
|
|
for (uint32 i = 0; i < wordsInUse; i++)
|
|
words[i] &= set.words[i];
|
|
|
|
recalculateWordsInUse();
|
|
|
|
return *this;
|
|
}
|
|
|
|
BitSet& BitSet::operator|=(const BitSet& set) {
|
|
|
|
uint32 wordsInCommon;
|
|
if (wordsInUse < set.wordsInUse) {
|
|
wordsInCommon = wordsInUse;
|
|
//ensureCapacity(set.wordsInUse);
|
|
//wordsInUse = set.wordsInUse;
|
|
}
|
|
else
|
|
wordsInCommon = set.wordsInUse;
|
|
|
|
// Perform logical OR on words in common
|
|
uint32 i = 0;
|
|
for (; i < wordsInCommon; i++)
|
|
words[i] |= set.words[i];
|
|
|
|
// TODO what to do if BitSets are not the same size !!!
|
|
|
|
// recalculateWordsInUse() is not needed
|
|
|
|
return *this;
|
|
}
|
|
|
|
BitSet& BitSet::operator^=(const BitSet& set) {
|
|
|
|
uint32 wordsInCommon;
|
|
if (wordsInUse < set.wordsInUse) {
|
|
wordsInCommon = wordsInUse;
|
|
//ensureCapacity(set.wordsInUse);
|
|
//wordsInUse = set.wordsInUse;
|
|
}
|
|
else
|
|
wordsInCommon = set.wordsInUse;
|
|
|
|
// Perform logical XOR on words in common
|
|
uint32 i = 0;
|
|
for (; i < wordsInCommon; i++)
|
|
words[i] ^= set.words[i];
|
|
|
|
// TODO what to do if BitSets are not the same size !!!
|
|
|
|
recalculateWordsInUse();
|
|
|
|
return *this;
|
|
}
|
|
|
|
BitSet& BitSet::operator-=(const BitSet& set) {
|
|
|
|
uint32 wordsInCommon;
|
|
if (wordsInUse < set.wordsInUse) {
|
|
wordsInCommon = wordsInUse;
|
|
//ensureCapacity(set.wordsInUse);
|
|
//wordsInUse = set.wordsInUse;
|
|
}
|
|
else
|
|
wordsInCommon = set.wordsInUse;
|
|
|
|
// Perform logical (a & !b) on words in common
|
|
uint32 i = 0;
|
|
for (; i < wordsInCommon; i++)
|
|
words[i] &= ~set.words[i];
|
|
|
|
recalculateWordsInUse();
|
|
|
|
return *this;
|
|
}
|
|
|
|
BitSet& BitSet::operator=(const BitSet &set) {
|
|
// Check for self-assignment!
|
|
if (this == &set)
|
|
return *this;
|
|
|
|
// we ensure that words array size is adequate (and not wordsInUse to ensure capacity to the future)
|
|
if (wordsLength < set.wordsLength)
|
|
{
|
|
if (words) delete[] words;
|
|
words = new uint64[set.wordsLength];
|
|
wordsLength = set.wordsLength;
|
|
}
|
|
memcpy(words, set.words, sizeof(uint64)*set.wordsInUse);
|
|
wordsInUse = set.wordsInUse;
|
|
|
|
return *this;
|
|
}
|
|
|
|
void BitSet::or_and(const BitSet& set1, const BitSet& set2) {
|
|
uint32 inUse = (set1.wordsInUse < set2.wordsInUse) ? set1.wordsInUse : set2.wordsInUse;
|
|
|
|
ensureCapacity(inUse);
|
|
wordsInUse = inUse;
|
|
|
|
// Perform logical AND on words in common
|
|
for (uint32 i = 0; i < inUse; i++)
|
|
words[i] |= (set1.words[i] & set2.words[i]);
|
|
|
|
// recalculateWordsInUse()...
|
|
}
|
|
|
|
bool BitSet::operator==(const BitSet &set) const
|
|
{
|
|
if (this == &set)
|
|
return true;
|
|
|
|
if (wordsInUse != set.wordsInUse)
|
|
return false;
|
|
|
|
// Check words in use by both BitSets
|
|
for (uint32 i = 0; i < wordsInUse; i++)
|
|
if (words[i] != set.words[i])
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool BitSet::operator!=(const BitSet &set) const
|
|
{
|
|
return !(*this == set);
|
|
}
|
|
|
|
void BitSet::toString(StringBuilder buffer, int indentLevel) const
|
|
{
|
|
*buffer += '{';
|
|
int32 i = nextSetBit(0);
|
|
char tmp[30];
|
|
if (i != -1) {
|
|
sprintf(tmp,"%d",i); *buffer += tmp;
|
|
for (i = nextSetBit(i+1); i >= 0; i = nextSetBit(i+1)) {
|
|
int32 endOfRun = nextClearBit(i);
|
|
do { *buffer += ", "; sprintf(tmp,"%d",i); *buffer += tmp; } while (++i < endOfRun);
|
|
}
|
|
}
|
|
*buffer += '}';
|
|
}
|
|
|
|
void BitSet::serialize(ByteBuffer* buffer, SerializableControl* flusher) {
|
|
|
|
uint32 n = wordsInUse;
|
|
if (n == 0) {
|
|
SerializeHelper::writeSize(0, buffer, flusher);
|
|
return;
|
|
}
|
|
uint32 len = 8 * (n-1);
|
|
for (uint64 x = words[n - 1]; x != 0; x >>= 8)
|
|
len++;
|
|
|
|
SerializeHelper::writeSize(len, buffer, flusher);
|
|
flusher->ensureBuffer(len);
|
|
|
|
for (uint32 i = 0; i < n - 1; i++)
|
|
buffer->putLong(words[i]);
|
|
|
|
for (uint64 x = words[n - 1]; x != 0; x >>= 8)
|
|
buffer->putByte((int8) (x & 0xff));
|
|
}
|
|
|
|
void BitSet::deserialize(ByteBuffer* buffer, DeserializableControl* control) {
|
|
|
|
uint32 bytes = SerializeHelper::readSize(buffer, control); // in bytes
|
|
|
|
wordsInUse = (bytes + 7) / 8;
|
|
if (wordsInUse > wordsLength)
|
|
{
|
|
if (words) delete[] words;
|
|
words = new uint64[wordsInUse];
|
|
wordsLength = wordsInUse;
|
|
}
|
|
|
|
if (wordsInUse == 0)
|
|
return;
|
|
|
|
control->ensureData(bytes);
|
|
|
|
uint32 i = 0;
|
|
uint32 longs = bytes / 8;
|
|
while (i < longs)
|
|
words[i++] = buffer->getLong();
|
|
|
|
for (uint32 j = i; j < wordsInUse; j++)
|
|
words[j] = 0;
|
|
|
|
for (uint32 remaining = (bytes - longs * 8), j = 0; j < remaining; j++)
|
|
words[i] |= (buffer->getByte() & 0xffL) << (8 * j);
|
|
|
|
}
|
|
|
|
}};
|