#include "config.h"
#include "HandleSet.h"
#include "HandleBlock.h"
#include "HandleBlockInlines.h"
#include "HeapRootVisitor.h"
#include "JSObject.h"
#include "JSCInlines.h"
#include <wtf/DataLog.h>
namespace JSC {
HandleSet::HandleSet(VM* vm)
: m_vm(vm)
{
grow();
}
HandleSet::~HandleSet()
{
while (!m_blockList.isEmpty())
m_vm->heap.blockAllocator().deallocate(HandleBlock::destroy(m_blockList.removeHead()));
}
void HandleSet::grow()
{
HandleBlock* newBlock = HandleBlock::create(m_vm->heap.blockAllocator().allocate<HandleBlock>(), this);
m_blockList.append(newBlock);
for (int i = newBlock->nodeCapacity() - 1; i >= 0; --i) {
Node* node = newBlock->nodeAtIndex(i);
new (NotNull, node) Node;
m_freeList.push(node);
}
}
void HandleSet::visitStrongHandles(HeapRootVisitor& heapRootVisitor)
{
Node* end = m_strongList.end();
for (Node* node = m_strongList.begin(); node != end; node = node->next()) {
#if ENABLE(GC_VALIDATION)
RELEASE_ASSERT(isLiveNode(node));
#endif
heapRootVisitor.visit(node->slot());
}
}
void HandleSet::writeBarrier(HandleSlot slot, const JSValue& value)
{
if (!value == !*slot && slot->isCell() == value.isCell())
return;
Node* node = toNode(slot);
#if ENABLE(GC_VALIDATION)
RELEASE_ASSERT(isLiveNode(node));
#endif
SentinelLinkedList<Node>::remove(node);
if (!value || !value.isCell()) {
m_immediateList.push(node);
return;
}
m_strongList.push(node);
#if ENABLE(GC_VALIDATION)
RELEASE_ASSERT(isLiveNode(node));
#endif
}
unsigned HandleSet::protectedGlobalObjectCount()
{
unsigned count = 0;
Node* end = m_strongList.end();
for (Node* node = m_strongList.begin(); node != end; node = node->next()) {
JSValue value = *node->slot();
if (value.isObject() && asObject(value.asCell())->isGlobalObject())
count++;
}
return count;
}
#if ENABLE(GC_VALIDATION) || !ASSERT_DISABLED
bool HandleSet::isLiveNode(Node* node)
{
if (node->prev()->next() != node)
return false;
if (node->next()->prev() != node)
return false;
return true;
}
#endif
}