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/*
* Copyright (C) 2025 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 "StackManager.h"
#include "StackManagerInlines.h"
namespace JSC {
CONCURRENT_SAFE void StackManager::requestStop()
{
Locker lock { m_mirrorLock };
m_trapAwareSoftStackLimit.storeRelaxed(stopRequestMarker());
for (auto& mirror : m_mirrors)
mirror.m_trapAwareSoftStackLimit.storeRelaxed(stopRequestMarker());
}
CONCURRENT_SAFE void StackManager::cancelStop()
{
if (Options::forceTrapAwareStackChecks()) [[unlikely]]
return;
Locker lock { m_mirrorLock };
m_trapAwareSoftStackLimit.storeRelaxed(m_softStackLimit);
for (auto& mirror : m_mirrors)
mirror.m_trapAwareSoftStackLimit.storeRelaxed(m_softStackLimit);
}
void StackManager::setStackSoftLimit(void* newStackLimit)
{
m_softStackLimit = newStackLimit;
Locker lock { m_mirrorLock };
#if !ENABLE(C_LOOP)
if (!hasStopRequest())
m_trapAwareSoftStackLimit.storeRelaxed(newStackLimit);
void* newTrapAwareSoftStackLimit = trapAwareSoftStackLimit();
#endif
for (auto& mirror : m_mirrors) {
#if !ENABLE(C_LOOP)
mirror.m_trapAwareSoftStackLimit.storeRelaxed(newTrapAwareSoftStackLimit);
#endif
mirror.m_softStackLimit = newStackLimit;
}
}
#if ENABLE(C_LOOP)
void StackManager::setCLoopStackLimit(void* newStackLimit)
{
m_cloopStackLimit = newStackLimit;
Locker lock { m_mirrorLock };
if (!hasStopRequest())
m_trapAwareSoftStackLimit.storeRelaxed(newStackLimit);
void* newTrapAwareSoftStackLimit = trapAwareSoftStackLimit();
for (auto& mirror : m_mirrors) {
mirror.m_trapAwareSoftStackLimit.storeRelaxed(newTrapAwareSoftStackLimit);
mirror.m_softStackLimit = newStackLimit;
}
}
#endif
void StackManager::registerMirror(StackManager::Mirror& mirror)
{
Locker lock { m_mirrorLock };
mirror.m_trapAwareSoftStackLimit.storeRelaxed(trapAwareSoftStackLimit());
mirror.m_softStackLimit = m_softStackLimit;
m_mirrors.append(&mirror);
}
void StackManager::unregisterMirror(StackManager::Mirror& mirror)
{
Locker lock { m_mirrorLock };
m_mirrors.remove(&mirror);
}
} // namespace JSC
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