KeyPageAddr KeyFile::fetchNewPage(bool leafPage) {
KeyPageAddr addr;
KeyPage page(m_pageInfo);
KeyPageAddr freeList = getFreeList();
if(freeList == DB_NULLADDR) {
try {
addr = getLast() + 1;
page.init(leafPage);
writePage(addr, page);
setLast(addr);
} catch(sqlca) {
return DB_NULLADDR;
}
} else {
try {
addr = freeList;
readPage(freeList, page);
logPage( freeList, page);
freeList = page.getNextFree();
setFreeList(freeList,-1);
page.init(leafPage);
writePage(addr, page);
} catch(sqlca) {
return DB_NULLADDR;
}
}
return addr;
}
void MarkedAllocator::didConsumeFreeList()
{
if (m_currentBlock)
m_currentBlock->didConsumeFreeList();
setFreeList(FreeList());
m_currentBlock = nullptr;
}
void MarkedAllocator::prepareForAllocation()
{
m_lastActiveBlock = nullptr;
m_currentBlock = nullptr;
setFreeList(FreeList());
m_allocationCursor = 0;
m_emptyCursor = 0;
m_unsweptCursor = 0;
m_eden.clearAll();
if (UNLIKELY(Options::useImmortalObjects())) {
// FIXME: Make this work again.
// https://bugs.webkit.org/show_bug.cgi?id=162296
RELEASE_ASSERT_NOT_REACHED();
}
}
void* MarkedAllocator::tryAllocateIn(MarkedBlock::Handle* block)
{
ASSERT(block);
ASSERT(!block->hasAnyNewlyAllocated());
ASSERT(!block->isFreeListed());
FreeList freeList = block->sweep(MarkedBlock::Handle::SweepToFreeList);
// It's possible to stumble on a completely full block. Marking tries to retire these, but
// that algorithm is racy and may forget to do it sometimes.
if (freeList.allocationWillFail()) {
ASSERT(block->isFreeListed());
block->unsweepWithNoNewlyAllocated();
ASSERT(!block->isFreeListed());
ASSERT(!isEmpty(block));
ASSERT(!isCanAllocateButNotEmpty(block));
return nullptr;
}
m_currentBlock = block;
setFreeList(freeList);
void* result;
if (m_freeList.remaining) {
unsigned cellSize = m_cellSize;
m_freeList.remaining -= cellSize;
result = m_freeList.payloadEnd - m_freeList.remaining - cellSize;
} else {
FreeCell* head = m_freeList.head;
m_freeList.head = head->next;
result = head;
}
RELEASE_ASSERT(result);
setIsEden(m_currentBlock, true);
m_markedSpace->didAllocateInBlock(m_currentBlock);
return result;
}
void KeyFile::releasePage(KeyPageAddr addr) {
KeyPage page(m_pageInfo);
page.setNextFree(getFreeList());
writePage(addr, page);
setFreeList(addr,1);
}
