#include "config.h"
#include "DFGSafepoint.h"
#if ENABLE(DFG_JIT)
#include "DFGPlan.h"
#include "DFGScannable.h"
#include "DFGThreadData.h"
#include "JSCInlines.h"
namespace JSC { namespace DFG {
Safepoint::Result::~Result()
{
RELEASE_ASSERT(m_wasChecked);
}
bool Safepoint::Result::didGetCancelled()
{
m_wasChecked = true;
return m_didGetCancelled;
}
Safepoint::Safepoint(Plan& plan, Result& result)
: m_vm(plan.vm)
, m_plan(plan)
, m_didCallBegin(false)
, m_result(result)
{
RELEASE_ASSERT(result.m_wasChecked);
result.m_wasChecked = false;
result.m_didGetCancelled = false;
}
Safepoint::~Safepoint()
{
RELEASE_ASSERT(m_didCallBegin);
if (ThreadData* data = m_plan.threadData) {
RELEASE_ASSERT(data->m_safepoint == this);
data->m_rightToRun.lock();
data->m_safepoint = nullptr;
}
}
void Safepoint::add(Scannable* scannable)
{
RELEASE_ASSERT(!m_didCallBegin);
m_scannables.append(scannable);
}
void Safepoint::begin()
{
RELEASE_ASSERT(!m_didCallBegin);
m_didCallBegin = true;
if (ThreadData* data = m_plan.threadData) {
RELEASE_ASSERT(!data->m_safepoint);
data->m_safepoint = this;
data->m_rightToRun.unlock();
}
}
void Safepoint::checkLivenessAndVisitChildren(SlotVisitor& visitor)
{
RELEASE_ASSERT(m_didCallBegin);
if (m_result.m_didGetCancelled)
return;
if (!isKnownToBeLiveDuringGC())
return;
for (unsigned i = m_scannables.size(); i--;)
m_scannables[i]->visitChildren(visitor);
}
bool Safepoint::isKnownToBeLiveDuringGC()
{
RELEASE_ASSERT(m_didCallBegin);
if (m_result.m_didGetCancelled)
return true;
return m_plan.isKnownToBeLiveDuringGC();
}
void Safepoint::cancel()
{
RELEASE_ASSERT(m_didCallBegin);
RELEASE_ASSERT(!m_result.m_didGetCancelled);
m_plan.cancel();
m_result.m_didGetCancelled = true;
m_vm = nullptr;
}
VM* Safepoint::vm() const
{
return m_vm;
}
} }
#endif // ENABLE(DFG_JIT)