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/*
* Copyright (C) 2012-2022 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
#if ENABLE(JIT)
#include "AdaptiveInferredPropertyValueWatchpointBase.h"
#include "ObjectPropertyCondition.h"
#include "Watchpoint.h"
#include <wtf/Bag.h>
#include <wtf/FastMalloc.h>
#include <wtf/Noncopyable.h>
namespace JSC {
class CodeBlock;
class StructureStubInfo;
class WatchpointsOnStructureStubInfo;
class StructureTransitionStructureStubClearingWatchpoint final : public Watchpoint {
WTF_MAKE_NONCOPYABLE(StructureTransitionStructureStubClearingWatchpoint);
WTF_MAKE_FAST_ALLOCATED;
public:
StructureTransitionStructureStubClearingWatchpoint(const ObjectPropertyCondition& key, WatchpointsOnStructureStubInfo& holder)
: Watchpoint(Watchpoint::Type::StructureTransitionStructureStubClearing)
, m_holder(&holder)
, m_key(key)
{
}
void fireInternal(VM&, const FireDetail&);
private:
PackedPtr<WatchpointsOnStructureStubInfo> m_holder;
ObjectPropertyCondition m_key;
};
class AdaptiveValueStructureStubClearingWatchpoint final : public AdaptiveInferredPropertyValueWatchpointBase {
using Base = AdaptiveInferredPropertyValueWatchpointBase;
WTF_MAKE_NONCOPYABLE(AdaptiveValueStructureStubClearingWatchpoint);
WTF_MAKE_FAST_ALLOCATED;
void handleFire(VM&, const FireDetail&) final;
public:
AdaptiveValueStructureStubClearingWatchpoint(const ObjectPropertyCondition& key, WatchpointsOnStructureStubInfo& holder)
: Base(key)
, m_holder(&holder)
{
RELEASE_ASSERT(key.condition().kind() == PropertyCondition::Equivalence);
}
private:
PackedPtr<WatchpointsOnStructureStubInfo> m_holder;
};
class WatchpointsOnStructureStubInfo final {
WTF_MAKE_NONCOPYABLE(WatchpointsOnStructureStubInfo);
WTF_MAKE_FAST_ALLOCATED;
public:
WatchpointsOnStructureStubInfo(CodeBlock* codeBlock, StructureStubInfo* stubInfo)
: m_codeBlock(codeBlock)
, m_stubInfo(stubInfo)
{
}
using Node = std::variant<StructureTransitionStructureStubClearingWatchpoint, AdaptiveValueStructureStubClearingWatchpoint>;
Node& addWatchpoint(const ObjectPropertyCondition& key);
static void ensureReferenceAndInstallWatchpoint(
std::unique_ptr<WatchpointsOnStructureStubInfo>& holderRef,
CodeBlock*, StructureStubInfo*, const ObjectPropertyCondition& key);
static Watchpoint* ensureReferenceAndAddWatchpoint(
std::unique_ptr<WatchpointsOnStructureStubInfo>& holderRef,
CodeBlock*, StructureStubInfo*);
CodeBlock* codeBlock() const { return m_codeBlock; }
StructureStubInfo* stubInfo() const { return m_stubInfo; }
bool isValid() const;
private:
CodeBlock* const m_codeBlock;
StructureStubInfo* const m_stubInfo;
// FIXME: use less memory for the entries in this Bag:
// https://bugs.webkit.org/show_bug.cgi?id=202380
Bag<std::variant<StructureTransitionStructureStubClearingWatchpoint, AdaptiveValueStructureStubClearingWatchpoint>> m_watchpoints;
};
} // namespace JSC
#endif // ENABLE(JIT)
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