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/*
* Copyright (C) 2021-2023 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 "AbstractSlotVisitor.h"
#include "JSCJSValue.h"
#include "MarkedBlock.h"
#include "VisitRaceKey.h"
#include "Weak.h"
#include <memory>
#include <wtf/BitSet.h>
#include <wtf/Deque.h>
#include <wtf/HashMap.h>
#include <wtf/RefPtr.h>
#include <wtf/SharedTask.h>
#include <wtf/TZoneMalloc.h>
namespace WTF {
class StackTrace;
} // namespace WTF
namespace JSC {
class ConservativeRoots;
class Heap;
class HeapCell;
class PreciseAllocation;
using WTF::StackTrace;
class VerifierSlotVisitor : public AbstractSlotVisitor {
WTF_MAKE_NONCOPYABLE(VerifierSlotVisitor);
WTF_MAKE_TZONE_ALLOCATED(VerifierSlotVisitor);
using Base = AbstractSlotVisitor;
public:
using ReferrerToken = AbstractSlotVisitor::ReferrerToken;
struct MarkerData {
MarkerData() = default;
MarkerData(MarkerData&&) = default;
MarkerData(ReferrerToken, std::unique_ptr<StackTrace>&&);
MarkerData& operator=(MarkerData&&) = default;
ReferrerToken referrer() const { return m_referrer; }
StackTrace* stack() const { return m_stack.get(); }
private:
ReferrerToken m_referrer;
std::unique_ptr<StackTrace> m_stack;
};
VerifierSlotVisitor(Heap&);
~VerifierSlotVisitor();
void append(const ConservativeRoots&) final;
void appendUnbarriered(JSCell*) final;
void appendHiddenUnbarriered(JSCell*) final;
bool isFirstVisit() const final;
bool isMarked(const void*) const final;
bool isMarked(MarkedBlock&, HeapCell*) const final;
bool isMarked(PreciseAllocation&, HeapCell*) const final;
void markAuxiliary(const void*) final;
void reportExtraMemoryVisited(size_t) final { }
#if ENABLE(RESOURCE_USAGE)
void reportExternalMemoryVisited(size_t) final { }
#endif
bool mutatorIsStopped() const final;
void didAddOpaqueRoot(void*) final;
void didFindOpaqueRoot(void*) final;
void didRace(const VisitRaceKey&) final { }
void dump(PrintStream&) const final;
void visitAsConstraint(const JSCell*) final;
void drain();
void addParallelConstraintTask(RefPtr<SharedTask<void(AbstractSlotVisitor&)>>) final;
NO_RETURN_DUE_TO_CRASH void addParallelConstraintTask(RefPtr<SharedTask<void(SlotVisitor&)>>) final;
void executeConstraintTasks();
template<typename Functor> void forEachLiveCell(const Functor&);
template<typename Functor> void forEachLivePreciseAllocation(const Functor&);
template<typename Functor> void forEachLiveMarkedBlockCell(const Functor&);
JS_EXPORT_PRIVATE void dumpMarkerData(HeapCell*);
bool doneMarking() { return m_doneMarking; }
void setDoneMarking()
{
ASSERT(!m_doneMarking);
m_doneMarking = true;
}
private:
class MarkedBlockData {
WTF_MAKE_TZONE_ALLOCATED(MarkedBlockData);
WTF_MAKE_NONCOPYABLE(MarkedBlockData);
public:
using AtomsBitSet = WTF::BitSet<MarkedBlock::atomsPerBlock>;
MarkedBlockData(MarkedBlock*);
MarkedBlock* block() const { return m_block; }
const AtomsBitSet& atoms() const { return m_atoms; }
bool isMarked(unsigned atomNumber) { return m_atoms.get(atomNumber); }
bool testAndSetMarked(unsigned atomNumber) { return m_atoms.testAndSet(atomNumber); }
void addMarkerData(unsigned atomNumber, MarkerData&&);
const MarkerData* markerData(unsigned atomNumber) const;
private:
MarkedBlock* m_block { nullptr };
AtomsBitSet m_atoms;
Vector<MarkerData> m_markers;
};
class PreciseAllocationData {
WTF_MAKE_TZONE_ALLOCATED(PreciseAllocationData);
WTF_MAKE_NONCOPYABLE(PreciseAllocationData);
public:
PreciseAllocationData(PreciseAllocation*);
PreciseAllocation* allocation() const { return m_allocation; }
void addMarkerData(MarkerData&&);
const MarkerData* markerData() const;
private:
PreciseAllocation* m_allocation { nullptr };
MarkerData m_marker;
};
class OpaqueRootData {
WTF_MAKE_TZONE_ALLOCATED(OpaqueRootData);
WTF_MAKE_NONCOPYABLE(OpaqueRootData);
public:
OpaqueRootData() = default;
void addMarkerData(MarkerData&&);
const MarkerData* markerData() const;
private:
MarkerData m_marker;
};
using MarkedBlockMap = UncheckedKeyHashMap<MarkedBlock*, std::unique_ptr<MarkedBlockData>>;
using PreciseAllocationMap = UncheckedKeyHashMap<PreciseAllocation*, std::unique_ptr<PreciseAllocationData>>;
using OpaqueRootMap = UncheckedKeyHashMap<void*, std::unique_ptr<OpaqueRootData>>;
void appendToMarkStack(JSCell*);
void appendSlow(JSCell* cell) { setMarkedAndAppendToMarkStack(cell); }
bool testAndSetMarked(const void* rawCell);
bool testAndSetMarked(PreciseAllocation&);
bool testAndSetMarked(MarkedBlock&, HeapCell*);
void setMarkedAndAppendToMarkStack(JSCell*);
void visitChildren(const JSCell*);
OpaqueRootMap m_opaqueRootMap;
PreciseAllocationMap m_preciseAllocationMap;
MarkedBlockMap m_markedBlockMap;
ConcurrentPtrHashSet m_opaqueRootStorage;
Deque<RefPtr<SharedTask<void(AbstractSlotVisitor&)>>, 32> m_constraintTasks;
bool m_doneMarking { false };
};
} // namespace JSC
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