void RegisterFile::releaseExcessCapacity()
{
m_reservation.decommit(m_start, reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(m_start));
addToCommittedByteCount(-(reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(m_start)));
m_commitEnd = m_start;
m_maxUsed = m_start;
}
bool JSStack::growSlowCase(Register* newTopOfStack)
{
Register* newTopOfStackWithReservedZone = newTopOfStack - m_reservedZoneSizeInRegisters;
// If we have already committed enough memory to satisfy this request,
// just update the end pointer and return.
if (newTopOfStackWithReservedZone >= m_commitTop) {
setStackLimit(newTopOfStack);
return true;
}
// Compute the chunk size of additional memory to commit, and see if we
// have it is still within our budget. If not, we'll fail to grow and
// return false.
ptrdiff_t delta = reinterpret_cast<char*>(m_commitTop) - reinterpret_cast<char*>(newTopOfStackWithReservedZone);
delta = WTF::roundUpToMultipleOf(commitSize, delta);
Register* newCommitTop = m_commitTop - (delta / sizeof(Register));
if (newCommitTop < reservationTop())
return false;
// Otherwise, the growth is still within our budget. Go ahead and commit
// it and return true.
m_reservation.commit(newCommitTop, delta);
addToCommittedByteCount(delta);
m_commitTop = newCommitTop;
setStackLimit(newTopOfStack);
return true;
}
RegisterFile::~RegisterFile()
{
void* base = m_reservation.base();
m_reservation.decommit(base, reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(base));
addToCommittedByteCount(-(reinterpret_cast<intptr_t>(m_commitEnd) - reinterpret_cast<intptr_t>(base)));
m_reservation.deallocate();
}
JSStack::~JSStack()
{
void* highAddress = reinterpret_cast<void*>(static_cast<char*>(m_reservation.base()) + m_reservation.size());
m_reservation.decommit(reinterpret_cast<void*>(m_commitEnd), reinterpret_cast<intptr_t>(highAddress) - reinterpret_cast<intptr_t>(m_commitEnd));
addToCommittedByteCount(-(reinterpret_cast<intptr_t>(highAddress) - reinterpret_cast<intptr_t>(m_commitEnd)));
m_reservation.deallocate();
}
JSStack::~JSStack()
{
ptrdiff_t sizeToDecommit = reinterpret_cast<char*>(highAddress()) - reinterpret_cast<char*>(m_commitTop);
m_reservation.decommit(reinterpret_cast<void*>(m_commitTop), sizeToDecommit);
addToCommittedByteCount(-sizeToDecommit);
m_reservation.deallocate();
}
void JSStack::releaseExcessCapacity()
{
ptrdiff_t delta = reinterpret_cast<uintptr_t>(highAddress()) - reinterpret_cast<uintptr_t>(m_commitEnd);
m_reservation.decommit(m_commitEnd, delta);
addToCommittedByteCount(-delta);
m_commitEnd = highAddress();
}
void JSStack::releaseExcessCapacity()
{
ptrdiff_t delta = reinterpret_cast<uintptr_t>(m_commitEnd) - reinterpret_cast<uintptr_t>(m_reservation.base());
m_reservation.decommit(m_reservation.base(), delta);
addToCommittedByteCount(-delta);
m_commitEnd = static_cast<Register*>(m_reservation.base());
}
void JSStack::releaseExcessCapacity()
{
Register* highAddressWithReservedZone = highAddress() - m_reservedZoneSizeInRegisters;
ptrdiff_t delta = reinterpret_cast<char*>(highAddressWithReservedZone) - reinterpret_cast<char*>(m_commitTop);
m_reservation.decommit(m_commitTop, delta);
addToCommittedByteCount(-delta);
m_commitTop = highAddressWithReservedZone;
}
bool JSStack::growSlowCase(Register* newEnd)
{
if (newEnd <= m_commitEnd) {
m_end = newEnd;
return true;
}
long delta = roundUpAllocationSize(reinterpret_cast<char*>(newEnd) - reinterpret_cast<char*>(m_commitEnd), commitSize);
if (reinterpret_cast<char*>(m_commitEnd) + delta > static_cast<char*>(m_reservation.base()) + m_reservation.size())
return false;
m_reservation.commit(m_commitEnd, delta);
addToCommittedByteCount(delta);
m_commitEnd = reinterpret_cast_ptr<Register*>(reinterpret_cast<char*>(m_commitEnd) + delta);
m_end = newEnd;
return true;
}
bool JSStack::growSlowCase(Register* newEnd)
{
// If we have already committed enough memory to satisfy this request,
// just update the end pointer and return.
if (newEnd >= m_commitEnd) {
updateStackLimit(newEnd);
return true;
}
// Compute the chunk size of additional memory to commit, and see if we
// have it is still within our budget. If not, we'll fail to grow and
// return false.
long delta = roundUpAllocationSize(reinterpret_cast<char*>(m_commitEnd) - reinterpret_cast<char*>(newEnd), commitSize);
if (reinterpret_cast<char*>(m_commitEnd) - delta <= reinterpret_cast<char*>(m_useableEnd))
return false;
// Otherwise, the growth is still within our budget. Go ahead and commit
// it and return true.
m_reservation.commit(reinterpret_cast<char*>(m_commitEnd) - delta, delta);
addToCommittedByteCount(delta);
m_commitEnd = reinterpret_cast_ptr<Register*>(reinterpret_cast<char*>(m_commitEnd) - delta);
updateStackLimit(newEnd);
return true;
}
void reuse(void* position, size_t size)
{
bool okay = m_allocation.commit(position, size);
ASSERT_UNUSED(okay, okay);
addToCommittedByteCount(static_cast<long>(size));
}
void release(void* position, size_t size)
{
m_allocation.decommit(position, size);
addToCommittedByteCount(-static_cast<long>(size));
}
