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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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "Watchpoint.h"
#include "LinkBuffer.h"
namespace JSC {
Watchpoint::~Watchpoint()
{
if (isOnList())
remove();
}
#if ENABLE(JIT)
void Watchpoint::correctLabels(LinkBuffer& linkBuffer)
{
MacroAssembler::Label label;
label.m_label.m_offset = m_source;
m_source = bitwise_cast<uintptr_t>(linkBuffer.locationOf(label).dataLocation());
label.m_label.m_offset = m_destination;
m_destination = bitwise_cast<uintptr_t>(linkBuffer.locationOf(label).dataLocation());
}
#endif
void Watchpoint::fire()
{
#if ENABLE(JIT)
MacroAssembler::replaceWithJump(
CodeLocationLabel(bitwise_cast<void*>(m_source)),
CodeLocationLabel(bitwise_cast<void*>(m_destination)));
if (isOnList())
remove();
#else
UNREACHABLE_FOR_PLATFORM();
#endif
}
WatchpointSet::WatchpointSet(InitialWatchpointSetMode mode)
: m_isWatched(mode == InitializedWatching)
, m_isInvalidated(false)
{
}
WatchpointSet::~WatchpointSet()
{
// Fire all watchpoints. This is necessary because it is possible, say with
// structure watchpoints, for the watchpoint set owner to die while the
// watchpoint owners are still live.
fireAllWatchpoints();
}
void WatchpointSet::add(Watchpoint* watchpoint)
{
if (!watchpoint)
return;
m_set.push(watchpoint);
m_isWatched = true;
}
void WatchpointSet::notifyWriteSlow()
{
ASSERT(m_isWatched);
fireAllWatchpoints();
m_isWatched = false;
m_isInvalidated = true;
}
void WatchpointSet::fireAllWatchpoints()
{
while (!m_set.isEmpty())
m_set.begin()->fire();
}
void InlineWatchpointSet::add(Watchpoint* watchpoint)
{
inflate()->add(watchpoint);
}
WatchpointSet* InlineWatchpointSet::inflateSlow()
{
ASSERT(isThin());
WatchpointSet* fat = adoptRef(new WatchpointSet(InitializedBlind)).leakRef();
if (m_data & IsInvalidatedFlag)
fat->m_isInvalidated = true;
if (m_data & IsWatchedFlag)
fat->m_isWatched = true;
m_data = bitwise_cast<uintptr_t>(fat);
return fat;
}
void InlineWatchpointSet::freeFat()
{
ASSERT(isFat());
fat()->deref();
}
} // namespace JSC
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