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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "JITStubRoutineSet.h"
#if ENABLE(JIT)
#include "GCAwareJITStubRoutine.h"
#include "SlotVisitor.h"
namespace JSC {
JITStubRoutineSet::JITStubRoutineSet() { }
JITStubRoutineSet::~JITStubRoutineSet()
{
for (size_t i = m_listOfRoutines.size(); i--;) {
GCAwareJITStubRoutine* routine = m_listOfRoutines[i];
routine->m_mayBeExecuting = false;
if (!routine->m_isJettisoned) {
// Inform the deref() routine that it should delete this guy as soon
// as the ref count reaches zero.
routine->m_isJettisoned = true;
continue;
}
routine->deleteFromGC();
}
}
void JITStubRoutineSet::add(GCAwareJITStubRoutine* routine)
{
ASSERT(!routine->m_isJettisoned);
m_listOfRoutines.append(routine);
uintptr_t start = routine->startAddress();
uintptr_t end = routine->endAddress();
uintptr_t step = JITStubRoutine::addressStep();
for (uintptr_t iter = start; iter < end; iter += step) {
ASSERT(m_addressToRoutineMap.find(iter) == m_addressToRoutineMap.end());
m_addressToRoutineMap.add(iter, routine);
}
}
void JITStubRoutineSet::clearMarks()
{
for (size_t i = m_listOfRoutines.size(); i--;)
m_listOfRoutines[i]->m_mayBeExecuting = false;
}
void JITStubRoutineSet::markSlow(uintptr_t address)
{
HashMap<uintptr_t, GCAwareJITStubRoutine*>::iterator iter =
m_addressToRoutineMap.find(address & ~(JITStubRoutine::addressStep() - 1));
if (iter == m_addressToRoutineMap.end())
return;
iter->second->m_mayBeExecuting = true;
}
void JITStubRoutineSet::deleteUnmarkedJettisonedStubRoutines()
{
for (size_t i = 0; i < m_listOfRoutines.size(); i++) {
GCAwareJITStubRoutine* routine = m_listOfRoutines[i];
if (!routine->m_isJettisoned || routine->m_mayBeExecuting)
continue;
uintptr_t start = routine->startAddress();
uintptr_t end = routine->endAddress();
uintptr_t step = JITStubRoutine::addressStep();
for (uintptr_t iter = start; iter < end; iter += step) {
ASSERT(m_addressToRoutineMap.find(iter) != m_addressToRoutineMap.end());
ASSERT(m_addressToRoutineMap.find(iter)->second == routine);
m_addressToRoutineMap.remove(iter);
}
routine->deleteFromGC();
m_listOfRoutines[i] = m_listOfRoutines.last();
m_listOfRoutines.removeLast();
i--;
}
}
void JITStubRoutineSet::traceMarkedStubRoutines(SlotVisitor& visitor)
{
for (size_t i = m_listOfRoutines.size(); i--;) {
GCAwareJITStubRoutine* routine = m_listOfRoutines[i];
if (!routine->m_mayBeExecuting)
continue;
routine->markRequiredObjects(visitor);
}
}
} // namespace JSC
#endif // ENABLE(JIT)
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