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/*
* Copyright (C) 2012-2023 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"
#include <wtf/TZoneMallocInlines.h>
#if ENABLE(JIT)
#include "GCAwareJITStubRoutine.h"
#include "HeapInlines.h"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
WTF_MAKE_TZONE_ALLOCATED_IMPL(JITStubRoutineSet);
JITStubRoutineSet::JITStubRoutineSet() = default;
JITStubRoutineSet::~JITStubRoutineSet()
{
auto destroyRoutine = [&](GCAwareJITStubRoutine* routine) {
routine->m_mayBeExecuting = false;
if (!routine->m_isJettisoned) {
// Inform the deref() routine that it should delete this stub as soon as the ref count reaches zero.
routine->m_isJettisoned = true;
return;
}
routine->deleteFromGC();
};
for (auto& entry : m_routines)
destroyRoutine(entry.routine);
for (auto& routine : m_immutableCodeRoutines)
destroyRoutine(routine);
}
void JITStubRoutineSet::add(GCAwareJITStubRoutine* routine)
{
RELEASE_ASSERT(!isCompilationThread());
ASSERT(!routine->m_isJettisoned);
if (routine->m_isCodeImmutable) {
m_immutableCodeRoutines.append(routine);
return;
}
m_routines.append(Routine {
routine->startAddress(),
routine
});
}
void JITStubRoutineSet::prepareForConservativeScan()
{
// Immutable code routines do not matter.
if (m_routines.isEmpty()) {
m_range = Range<uintptr_t> { 0, 0 };
return;
}
std::sort(
m_routines.begin(), m_routines.end(),
[&] (const Routine& a, const Routine& b) {
return a.startAddress < b.startAddress;
});
m_range = Range<uintptr_t> {
m_routines.first().startAddress,
m_routines.last().routine->endAddress()
};
}
void JITStubRoutineSet::clearMarks()
{
// Immutable code routines do not matter.
for (auto& entry : m_routines)
entry.routine->m_mayBeExecuting = false;
}
void JITStubRoutineSet::markSlow(uintptr_t address)
{
ASSERT(isJITPC(std::bit_cast<void*>(address)));
ASSERT(!m_routines.isEmpty());
Routine* result = approximateBinarySearch<Routine>(
m_routines.begin(), m_routines.size(), address,
[] (const Routine* routine) -> uintptr_t { return routine->startAddress; });
if (result) {
auto markIfContained = [&] (const Routine& routine, uintptr_t address) {
if (routine.startAddress <= address && address < routine.routine->endAddress()) {
ASSERT(!routine.routine->m_isCodeImmutable);
routine.routine->m_mayBeExecuting = true;
return true;
}
return false;
};
if (result > m_routines.begin()) {
if (markIfContained(result[-1], address))
return;
}
if (markIfContained(result[0], address))
return;
if (result + 1 < m_routines.end()) {
if (markIfContained(result[1], address))
return;
}
}
}
void JITStubRoutineSet::deleteUnmarkedJettisonedStubRoutines(VM& vm)
{
ASSERT(vm.heap.isInPhase(CollectorPhase::End));
auto shouldRemove = [&](GCAwareJITStubRoutine* stub) {
if (!stub->m_ownerIsDead)
stub->m_ownerIsDead = stub->removeDeadOwners(vm);
// If the stub is running right now, we should keep it alive regardless of whether owner CodeBlock gets dead.
// It is OK since we already marked all the related cells.
if (stub->m_mayBeExecuting)
return false;
// If the stub is already jettisoned, and if it is not executed right now, then we can safely destroy this right now
// since this is not reachable from dead CodeBlock (in CodeBlock's destructor), plus, this will not be executed later.
if (stub->m_isJettisoned) {
stub->deleteFromGC();
return true;
}
// If the owner is already dead, then this stub will not be executed. We should remove this from this set.
// But we should not call deleteFromGC here since unswept CodeBlock may still hold the reference to this stub.
if (stub->m_ownerIsDead) {
// Inform the deref() routine that it should delete this stub as soon as the ref count reaches zero.
stub->m_isJettisoned = true;
return true;
}
return false;
};
m_routines.removeAllMatching([&](auto& entry) {
return shouldRemove(entry.routine);
});
m_immutableCodeRoutines.removeAllMatching([&](auto* stub) {
return shouldRemove(stub);
});
}
template<typename Visitor>
void JITStubRoutineSet::traceMarkedStubRoutines(Visitor& visitor)
{
for (auto& entry : m_routines) {
GCAwareJITStubRoutine* routine = entry.routine;
if (!routine->m_mayBeExecuting)
continue;
routine->markRequiredObjects(visitor);
}
}
template void JITStubRoutineSet::traceMarkedStubRoutines(AbstractSlotVisitor&);
template void JITStubRoutineSet::traceMarkedStubRoutines(SlotVisitor&);
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#else
namespace JSC {
WTF_MAKE_TZONE_ALLOCATED_IMPL(JITStubRoutineSet);
} // namespace JSC
#endif // ENABLE(JIT)
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