void BitVector::resize(size_t numBits) {
if (numBits <= maxInlineBits()) {
if (isInline())
return;
OutOfLineBits* myOutOfLineBits = outOfLineBits();
m_bitsOrPointer = makeInlineBits(*myOutOfLineBits->bits());
OutOfLineBits::destroy(myOutOfLineBits);
return;
}
resizeOutOfLine(numBits);
}
void BitVector::setSlow(const BitVector& other) {
uintptr_t newBitsOrPointer;
if (other.isInline()) {
newBitsOrPointer = other.m_bitsOrPointer;
} else {
OutOfLineBits* newOutOfLineBits = OutOfLineBits::create(other.size());
memcpy(newOutOfLineBits->bits(), other.bits(), byteCount(other.size()));
newBitsOrPointer = bitwiseCast<uintptr_t>(newOutOfLineBits) >> 1;
}
if (!isInline())
OutOfLineBits::destroy(outOfLineBits());
m_bitsOrPointer = newBitsOrPointer;
}
void BitVector::mergeSlow(const BitVector& other)
{
if (other.isInline()) {
ASSERT(!isInline());
*bits() |= cleanseInlineBits(other.m_bitsOrPointer);
return;
}
ensureSize(other.size());
ASSERT(!isInline());
ASSERT(!other.isInline());
OutOfLineBits* a = outOfLineBits();
const OutOfLineBits* b = other.outOfLineBits();
for (unsigned i = a->numWords(); i--;)
a->bits()[i] |= b->bits()[i];
}
void BitVector::excludeSlow(const BitVector& other)
{
if (other.isInline()) {
ASSERT(!isInline());
*bits() &= ~cleanseInlineBits(other.m_bitsOrPointer);
return;
}
if (isInline()) {
ASSERT(!other.isInline());
m_bitsOrPointer &= ~*other.outOfLineBits()->bits();
m_bitsOrPointer |= (static_cast<uintptr_t>(1) << maxInlineBits());
ASSERT(isInline());
return;
}
OutOfLineBits* a = outOfLineBits();
const OutOfLineBits* b = other.outOfLineBits();
for (unsigned i = std::min(a->numWords(), b->numWords()); i--;)
a->bits()[i] &= ~b->bits()[i];
}
void BitVector::resizeOutOfLine(size_t numBits)
{
ASSERT(numBits > maxInlineBits());
OutOfLineBits* newOutOfLineBits = OutOfLineBits::create(numBits);
size_t newNumWords = newOutOfLineBits->numWords();
if (isInline()) {
// Make sure that all of the bits are zero in case we do a no-op resize.
*newOutOfLineBits->bits() = m_bitsOrPointer & ~(static_cast<uintptr_t>(1) << maxInlineBits());
memset(newOutOfLineBits->bits() + 1, 0, (newNumWords - 1) * sizeof(void*));
} else {
if (numBits > size()) {
size_t oldNumWords = outOfLineBits()->numWords();
memcpy(newOutOfLineBits->bits(), outOfLineBits()->bits(), oldNumWords * sizeof(void*));
memset(newOutOfLineBits->bits() + oldNumWords, 0, (newNumWords - oldNumWords) * sizeof(void*));
} else
memcpy(newOutOfLineBits->bits(), outOfLineBits()->bits(), newOutOfLineBits->numWords() * sizeof(void*));
OutOfLineBits::destroy(outOfLineBits());
}
m_bitsOrPointer = bitwise_cast<uintptr_t>(newOutOfLineBits) >> 1;
}