blob: a4a43dfca1f038a39b96faea67d7e1bbe0207121 [file] [log] [blame]
/*
* Copyright (C) 2021 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.
*/
#pragma once
#include "VM.h"
namespace JSC {
ALWAYS_INLINE VM& VMTraps::vm() const
{
return *bitwise_cast<VM*>(bitwise_cast<uintptr_t>(this) - OBJECT_OFFSETOF(VM, m_traps));
}
inline void VMTraps::deferTermination(DeferAction deferAction)
{
auto originalCount = m_deferTerminationCount++;
ASSERT(m_deferTerminationCount < UINT_MAX);
if (UNLIKELY(originalCount == 0 && vm().exception()))
deferTerminationSlow(deferAction);
}
inline void VMTraps::undoDeferTermination(DeferAction deferAction)
{
ASSERT(m_deferTerminationCount > 0);
ASSERT(!m_suspendedTerminationException || vm().terminationInProgress());
if (UNLIKELY(--m_deferTerminationCount == 0 && vm().terminationInProgress()))
undoDeferTerminationSlow(deferAction);
}
ALWAYS_INLINE DeferTraps::DeferTraps(VM& vm)
: m_traps(vm.traps())
, m_isActive(!m_traps.hasTrapBit(VMTraps::DeferTrapHandling))
{
if (m_isActive)
m_traps.setTrapBit(VMTraps::DeferTrapHandling);
}
ALWAYS_INLINE DeferTraps::~DeferTraps()
{
if (m_isActive)
m_traps.clearTrapBit(VMTraps::DeferTrapHandling);
}
} // namespace JSC