void BitVector::resizeOutOfLine(size_t numBits)
{
ASSERT(numBits > maxInlineBits());
OutOfLineBits* newOutOfLineBits = OutOfLineBits::create(numBits);
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());
} else {
if (numBits > size()) {
size_t oldNumWords = outOfLineBits()->numWords();
size_t newNumWords = newOutOfLineBits->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;
}
void BitVector::filterSlow(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];
for (unsigned i = b->numWords(); i < a->numWords(); ++i)
a->bits()[i] = 0;
}
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];
}