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/*
* Copyright (C) 2012, 2015-2016 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 "StructureStubClearingWatchpoint.h"
#if ENABLE(JIT)
#include "CodeBlock.h"
#include "JSCellInlines.h"
#include "StructureStubInfo.h"
namespace JSC {
void StructureTransitionStructureStubClearingWatchpoint::fireInternal(VM& vm, const FireDetail&)
{
if (!m_holder->isValid())
return;
if (!m_key || !m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
// This will implicitly cause my own demise: stub reset removes all watchpoints.
// That works, because deleting a watchpoint removes it from the set's list, and
// the set's list traversal for firing is robust against the set changing.
ConcurrentJSLocker locker(m_holder->codeBlock()->m_lock);
m_holder->stubInfo()->reset(locker, m_holder->codeBlock());
return;
}
if (m_key.kind() == PropertyCondition::Presence) {
// If this was a presence condition, let's watch the property for replacements. This is profitable
// for the DFG, which will want the replacement set to be valid in order to do constant folding.
m_key.object()->structure()->startWatchingPropertyForReplacements(vm, m_key.offset());
}
m_key.object()->structure()->addTransitionWatchpoint(this);
}
inline bool WatchpointsOnStructureStubInfo::isValid() const
{
return m_codeBlock->isLive();
}
WatchpointsOnStructureStubInfo::Node& WatchpointsOnStructureStubInfo::addWatchpoint(const ObjectPropertyCondition& key)
{
if (!key || key.condition().kind() != PropertyCondition::Equivalence)
return *m_watchpoints.add(std::in_place_type<StructureTransitionStructureStubClearingWatchpoint>, key, *this);
ASSERT(key.condition().kind() == PropertyCondition::Equivalence);
return *m_watchpoints.add(std::in_place_type<AdaptiveValueStructureStubClearingWatchpoint>, key, *this);
}
void WatchpointsOnStructureStubInfo::ensureReferenceAndInstallWatchpoint(
std::unique_ptr<WatchpointsOnStructureStubInfo>& holderRef, CodeBlock* codeBlock,
StructureStubInfo* stubInfo, const ObjectPropertyCondition& key)
{
if (!holderRef)
holderRef = makeUnique<WatchpointsOnStructureStubInfo>(codeBlock, stubInfo);
else {
ASSERT(holderRef->m_codeBlock == codeBlock);
ASSERT(holderRef->m_stubInfo == stubInfo);
}
ASSERT(!!key);
auto& watchpointVariant = holderRef->addWatchpoint(key);
if (key.kind() == PropertyCondition::Equivalence) {
auto& adaptiveWatchpoint = std::get<AdaptiveValueStructureStubClearingWatchpoint>(watchpointVariant);
adaptiveWatchpoint.install(codeBlock->vm());
} else {
auto* structureTransitionWatchpoint = &std::get<StructureTransitionStructureStubClearingWatchpoint>(watchpointVariant);
key.object()->structure()->addTransitionWatchpoint(structureTransitionWatchpoint);
}
}
Watchpoint* WatchpointsOnStructureStubInfo::ensureReferenceAndAddWatchpoint(
std::unique_ptr<WatchpointsOnStructureStubInfo>& holderRef, CodeBlock* codeBlock,
StructureStubInfo* stubInfo)
{
if (!holderRef)
holderRef = makeUnique<WatchpointsOnStructureStubInfo>(codeBlock, stubInfo);
else {
ASSERT(holderRef->m_codeBlock == codeBlock);
ASSERT(holderRef->m_stubInfo == stubInfo);
}
return &std::get<StructureTransitionStructureStubClearingWatchpoint>(holderRef->addWatchpoint(ObjectPropertyCondition()));
}
void AdaptiveValueStructureStubClearingWatchpoint::handleFire(VM&, const FireDetail&)
{
if (!m_holder->isValid())
return;
// This will implicitly cause my own demise: stub reset removes all watchpoints.
// That works, because deleting a watchpoint removes it from the set's list, and
// the set's list traversal for firing is robust against the set changing.
ConcurrentJSLocker locker(m_holder->codeBlock()->m_lock);
m_holder->stubInfo()->reset(locker, m_holder->codeBlock());
}
} // namespace JSC
#endif // ENABLE(JIT)
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