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/*
* Copyright (C) 2011-2023 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 "JSCast.h"
#include "JSTypeInfo.h"
#include "PropertyDescriptor.h"
#include "PutDirectIndexMode.h"
#include "VM.h"
#include "WriteBarrier.h"
#include <wtf/HashMap.h>
#include <wtf/TZoneMalloc.h>
namespace JSC {
class SparseArrayEntry;
class SparseArrayValueMap final : public JSCell {
public:
typedef JSCell Base;
static constexpr unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
private:
typedef UncheckedKeyHashMap<uint64_t, SparseArrayEntry, WTF::IntHash<uint64_t>, WTF::UnsignedWithZeroKeyHashTraits<uint64_t>> Map;
enum Flags {
Normal = 0,
SparseMode = 1 << 0,
LengthIsReadOnly = 1 << 1,
HasAnyKindOfGetterSetterProperties = 1 << 2,
};
SparseArrayValueMap(VM&);
DECLARE_DEFAULT_FINISH_CREATION;
public:
DECLARE_EXPORT_INFO;
typedef Map::iterator iterator;
typedef Map::const_iterator const_iterator;
typedef Map::AddResult AddResult;
static SparseArrayValueMap* create(VM&);
static constexpr DestructionMode needsDestruction = NeedsDestruction;
static void destroy(JSCell*);
template<typename CellType, SubspaceAccess>
static GCClient::IsoSubspace* subspaceFor(VM& vm)
{
return &vm.sparseArrayValueMapSpace();
}
static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
DECLARE_VISIT_CHILDREN;
bool sparseMode()
{
return m_flags & SparseMode;
}
void setSparseMode()
{
m_flags = static_cast<Flags>(m_flags | SparseMode);
}
bool lengthIsReadOnly()
{
return m_flags & LengthIsReadOnly;
}
void setLengthIsReadOnly()
{
m_flags = static_cast<Flags>(m_flags | LengthIsReadOnly);
}
bool hasAnyKindOfGetterSetterProperties()
{
return m_flags & HasAnyKindOfGetterSetterProperties;
}
void setHasAnyKindOfGetterSetterProperties()
{
m_flags = static_cast<Flags>(m_flags | HasAnyKindOfGetterSetterProperties);
}
// These methods may mutate the contents of the map
bool putEntry(JSGlobalObject*, JSObject*, unsigned, JSValue, bool shouldThrow);
bool putDirect(JSGlobalObject*, JSObject*, unsigned, JSValue, unsigned attributes, PutDirectIndexMode);
AddResult add(JSObject*, unsigned);
iterator find(unsigned i) { return m_map.find(i); }
// This should ASSERT the remove is valid (check the result of the find).
void remove(iterator it);
void remove(unsigned i);
JSValue getConcurrently(unsigned index);
// These methods do not mutate the contents of the map.
iterator notFound() { return m_map.end(); }
bool isEmpty() const { return m_map.isEmpty(); }
bool contains(unsigned i) const { return m_map.contains(i); }
size_t size() const { return m_map.size(); }
// Only allow const begin/end iteration.
const_iterator begin() const { return m_map.begin(); }
const_iterator end() const { return m_map.end(); }
private:
Map m_map;
Flags m_flags { Normal };
size_t m_reportedCapacity { 0 };
};
class SparseArrayEntry : private WriteBarrier<Unknown> {
WTF_MAKE_TZONE_ALLOCATED(SparseArrayEntry);
public:
using Base = WriteBarrier<Unknown>;
SparseArrayEntry()
{
Base::setWithoutWriteBarrier(jsUndefined());
}
void get(JSObject*, PropertySlot&) const;
void get(PropertyDescriptor&) const;
bool put(JSGlobalObject*, JSValue thisValue, SparseArrayValueMap*, JSValue, bool shouldThrow);
JSValue getNonSparseMode() const;
JSValue getConcurrently() const;
JSValue get() const;
unsigned attributes() const { return m_attributes; }
void forceSet(SparseArrayValueMap* map, unsigned attributes)
{
// FIXME: We can expand this for non x86 environments. Currently, loading ReadOnly | DontDelete property
// from compiler thread is only supported in X86 architecture because of its TSO nature.
// https://bugs.webkit.org/show_bug.cgi?id=134641
if (isX86())
WTF::storeStoreFence();
if (attributes & PropertyAttribute::Accessor)
map->setHasAnyKindOfGetterSetterProperties();
m_attributes = attributes;
}
void forceSet(VM& vm, SparseArrayValueMap* map, JSValue value, unsigned attributes)
{
Base::set(vm, map, value);
forceSet(map, attributes);
}
WriteBarrier<Unknown>& asValue() { return *this; }
private:
unsigned m_attributes { 0 };
};
} // namespace JSC
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