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/*
* Copyright (C) 2016-2021 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 "ExceptionHelpers.h"
#include "JSCJSValue.h"
#include "JSObject.h"
namespace JSC {
JS_EXPORT_PRIVATE const ClassInfo* getHashMapBucketKeyClassInfo();
JS_EXPORT_PRIVATE const ClassInfo* getHashMapBucketKeyValueClassInfo();
JS_EXPORT_PRIVATE const ClassInfo* getHashMapImplKeyClassInfo();
JS_EXPORT_PRIVATE const ClassInfo* getHashMapImplKeyValueClassInfo();
enum class HashTableType {
Key,
KeyValue
};
struct HashMapBucketDataKey {
static const HashTableType Type = HashTableType::Key;
WriteBarrier<Unknown> key;
};
struct HashMapBucketDataKeyValue {
static const HashTableType Type = HashTableType::KeyValue;
WriteBarrier<Unknown> key;
WriteBarrier<Unknown> value;
};
template <typename Data>
class HashMapBucket final : public JSCell {
using Base = JSCell;
template <typename T = Data>
static typename std::enable_if<std::is_same<T, HashMapBucketDataKey>::value, Structure*>::type selectStructure(VM& vm)
{
return vm.hashMapBucketSetStructure.get();
}
template <typename T = Data>
static typename std::enable_if<std::is_same<T, HashMapBucketDataKeyValue>::value, Structure*>::type selectStructure(VM& vm)
{
return vm.hashMapBucketMapStructure.get();
}
public:
static const HashTableType Type = Data::Type;
static const ClassInfo s_info; // This is never accessed directly, since that would break linkage on some compilers.
template<typename CellType, SubspaceAccess mode>
static IsoSubspace* subspaceFor(VM& vm)
{
if constexpr (Type == HashTableType::Key)
return vm.setBucketSpace<mode>();
else
return vm.mapBucketSpace<mode>();
}
static const ClassInfo* info()
{
if constexpr (Type == HashTableType::Key)
return getHashMapBucketKeyClassInfo();
else
return getHashMapBucketKeyValueClassInfo();
}
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(CellType, StructureFlags), info());
}
static HashMapBucket* create(VM& vm)
{
HashMapBucket* bucket = new (NotNull, allocateCell<HashMapBucket<Data>>(vm)) HashMapBucket(vm, selectStructure(vm));
bucket->finishCreation(vm);
ASSERT(!bucket->next());
ASSERT(!bucket->prev());
return bucket;
}
static HashMapBucket* createSentinel(VM& vm)
{
auto* bucket = create(vm);
bucket->setKey(vm, jsUndefined());
bucket->setValue(vm, jsUndefined());
ASSERT(!bucket->deleted());
return bucket;
}
HashMapBucket(VM& vm, Structure* structure)
: Base(vm, structure)
{
ASSERT(deleted());
}
ALWAYS_INLINE void setNext(VM& vm, HashMapBucket* bucket)
{
m_next.set(vm, this, bucket);
}
ALWAYS_INLINE void setPrev(VM& vm, HashMapBucket* bucket)
{
m_prev.set(vm, this, bucket);
}
ALWAYS_INLINE void setKey(VM& vm, JSValue key)
{
m_data.key.set(vm, this, key);
}
template <typename T = Data>
ALWAYS_INLINE typename std::enable_if<std::is_same<T, HashMapBucketDataKeyValue>::value>::type setValue(VM& vm, JSValue value)
{
m_data.value.set(vm, this, value);
}
template <typename T = Data>
ALWAYS_INLINE typename std::enable_if<std::is_same<T, HashMapBucketDataKey>::value>::type setValue(VM&, JSValue) { }
ALWAYS_INLINE JSValue key() const { return m_data.key.get(); }
template <typename T = Data>
ALWAYS_INLINE typename std::enable_if<std::is_same<T, HashMapBucketDataKeyValue>::value, JSValue>::type value() const
{
return m_data.value.get();
}
DECLARE_VISIT_CHILDREN;
ALWAYS_INLINE HashMapBucket* next() const { return m_next.get(); }
ALWAYS_INLINE HashMapBucket* prev() const { return m_prev.get(); }
ALWAYS_INLINE bool deleted() const { return !key(); }
ALWAYS_INLINE void makeDeleted(VM& vm)
{
setKey(vm, JSValue());
setValue(vm, JSValue());
}
static ptrdiff_t offsetOfKey()
{
return OBJECT_OFFSETOF(HashMapBucket, m_data) + OBJECT_OFFSETOF(Data, key);
}
template <typename T = Data>
static typename std::enable_if<std::is_same<T, HashMapBucketDataKeyValue>::value, ptrdiff_t>::type offsetOfValue()
{
return OBJECT_OFFSETOF(HashMapBucket, m_data) + OBJECT_OFFSETOF(Data, value);
}
static ptrdiff_t offsetOfNext()
{
return OBJECT_OFFSETOF(HashMapBucket, m_next);
}
template <typename T = Data>
ALWAYS_INLINE static typename std::enable_if<std::is_same<T, HashMapBucketDataKeyValue>::value, JSValue>::type extractValue(const HashMapBucket& bucket)
{
return bucket.value();
}
template <typename T = Data>
ALWAYS_INLINE static typename std::enable_if<std::is_same<T, HashMapBucketDataKey>::value, JSValue>::type extractValue(const HashMapBucket&)
{
return JSValue();
}
private:
WriteBarrier<HashMapBucket> m_next;
WriteBarrier<HashMapBucket> m_prev;
Data m_data;
};
template <typename BucketType>
class HashMapBuffer {
public:
HashMapBuffer() = delete;
static size_t allocationSize(Checked<size_t> capacity)
{
return capacity * sizeof(BucketType*);
}
ALWAYS_INLINE BucketType** buffer() const
{
return bitwise_cast<BucketType**>(this);
}
static HashMapBuffer* create(JSGlobalObject* globalObject, VM& vm, JSCell*, uint32_t capacity)
{
auto scope = DECLARE_THROW_SCOPE(vm);
size_t allocationSize = HashMapBuffer::allocationSize(capacity);
void* data = vm.jsValueGigacageAuxiliarySpace().allocate(vm, allocationSize, nullptr, AllocationFailureMode::ReturnNull);
if (!data) {
throwOutOfMemoryError(globalObject, scope);
return nullptr;
}
HashMapBuffer* buffer = static_cast<HashMapBuffer*>(data);
buffer->reset(capacity);
return buffer;
}
ALWAYS_INLINE void reset(uint32_t capacity)
{
memset(this, -1, allocationSize(capacity));
}
};
ALWAYS_INLINE bool areKeysEqual(JSGlobalObject*, JSValue, JSValue);
// Note that normalization is inlined in DFG's NormalizeMapKey.
// Keep in sync with the implementation of DFG and FTL normalization.
ALWAYS_INLINE JSValue normalizeMapKey(JSValue key);
ALWAYS_INLINE uint32_t wangsInt64Hash(uint64_t key);
ALWAYS_INLINE uint32_t jsMapHash(JSBigInt*);
ALWAYS_INLINE uint32_t jsMapHash(JSGlobalObject*, VM&, JSValue);
ALWAYS_INLINE uint32_t shouldShrink(uint32_t capacity, uint32_t keyCount);
ALWAYS_INLINE uint32_t shouldRehashAfterAdd(uint32_t capacity, uint32_t keyCount, uint32_t deleteCount);
ALWAYS_INLINE uint32_t nextCapacity(uint32_t capacity, uint32_t keyCount);
template <typename HashMapBucketType>
class HashMapImpl : public JSNonFinalObject {
using Base = JSNonFinalObject;
using HashMapBufferType = HashMapBuffer<HashMapBucketType>;
public:
using BucketType = HashMapBucketType;
DECLARE_VISIT_CHILDREN;
static size_t estimatedSize(JSCell*, VM&);
HashMapImpl(VM& vm, Structure* structure)
: Base(vm, structure)
, m_keyCount(0)
, m_deleteCount(0)
, m_capacity(4)
{
}
HashMapImpl(VM& vm, Structure* structure, uint32_t sizeHint)
: Base(vm, structure)
, m_keyCount(0)
, m_deleteCount(0)
{
uint32_t capacity = (Checked<uint32_t>(sizeHint) * 2) + 1;
capacity = std::max<uint32_t>(WTF::roundUpToPowerOfTwo(capacity), 4U);
m_capacity = capacity;
}
ALWAYS_INLINE HashMapBucketType** buffer() const
{
return m_buffer->buffer();
}
void finishCreation(JSGlobalObject*, VM&);
void finishCreation(JSGlobalObject*, VM&, HashMapImpl* base);
static HashMapBucketType* emptyValue()
{
return bitwise_cast<HashMapBucketType*>(static_cast<uintptr_t>(-1));
}
static ALWAYS_INLINE bool isEmpty(HashMapBucketType* bucket)
{
return bucket == emptyValue();
}
static HashMapBucketType* deletedValue()
{
return bitwise_cast<HashMapBucketType*>(static_cast<uintptr_t>(-3));
}
static ALWAYS_INLINE bool isDeleted(HashMapBucketType* bucket)
{
return bucket == deletedValue();
}
ALWAYS_INLINE HashMapBucketType** findBucket(JSGlobalObject*, JSValue key);
ALWAYS_INLINE HashMapBucketType** findBucket(JSGlobalObject*, JSValue key, uint32_t hash);
template <typename T = HashMapBucketType>
ALWAYS_INLINE typename std::enable_if<std::is_same<T, HashMapBucket<HashMapBucketDataKeyValue>>::value, JSValue>::type get(JSGlobalObject*, JSValue key);
ALWAYS_INLINE bool has(JSGlobalObject*, JSValue key);
ALWAYS_INLINE void add(JSGlobalObject*, JSValue key, JSValue = JSValue());
ALWAYS_INLINE HashMapBucketType* addNormalized(JSGlobalObject*, JSValue key, JSValue, uint32_t hash);
ALWAYS_INLINE bool remove(JSGlobalObject*, JSValue key);
ALWAYS_INLINE uint32_t size() const
{
return m_keyCount;
}
ALWAYS_INLINE void clear(JSGlobalObject*);
ALWAYS_INLINE size_t bufferSizeInBytes() const
{
return m_capacity * sizeof(HashMapBucketType*);
}
static ptrdiff_t offsetOfHead()
{
return OBJECT_OFFSETOF(HashMapImpl<HashMapBucketType>, m_head);
}
static ptrdiff_t offsetOfBuffer()
{
return OBJECT_OFFSETOF(HashMapImpl<HashMapBucketType>, m_buffer);
}
static ptrdiff_t offsetOfCapacity()
{
return OBJECT_OFFSETOF(HashMapImpl<HashMapBucketType>, m_capacity);
}
HashMapBucketType* head() { return m_head.get(); }
HashMapBucketType* tail() { return m_tail.get(); }
size_t approximateSize() const
{
size_t size = sizeof(HashMapImpl);
size += bufferSizeInBytes();
size += 2 * sizeof(HashMapBucketType); // Head and tail members.
size += m_keyCount * sizeof(HashMapBucketType); // Number of members that are on the list.
return size;
}
private:
ALWAYS_INLINE uint32_t shouldRehashAfterAdd() const
{
return JSC::shouldRehashAfterAdd(m_capacity, m_keyCount, m_deleteCount);
}
ALWAYS_INLINE uint32_t shouldShrink() const
{
return JSC::shouldShrink(m_capacity, m_keyCount);
}
ALWAYS_INLINE void setUpHeadAndTail(JSGlobalObject*, VM&);
ALWAYS_INLINE void addNormalizedNonExistingForCloning(JSGlobalObject*, JSValue key, JSValue = JSValue());
template<typename CanUseBucket>
ALWAYS_INLINE void addNormalizedInternal(JSGlobalObject*, JSValue key, JSValue, const CanUseBucket&);
template<typename CanUseBucket>
ALWAYS_INLINE HashMapBucketType* addNormalizedInternal(VM&, JSValue key, JSValue, uint32_t hash, const CanUseBucket&);
ALWAYS_INLINE HashMapBucketType** findBucketAlreadyHashedAndNormalized(JSGlobalObject*, JSValue key, uint32_t hash);
void rehash(JSGlobalObject*);
ALWAYS_INLINE void checkConsistency() const;
void makeAndSetNewBuffer(JSGlobalObject*, VM&);
ALWAYS_INLINE void assertBufferIsEmpty() const;
WriteBarrier<HashMapBucketType> m_head;
WriteBarrier<HashMapBucketType> m_tail;
AuxiliaryBarrier<HashMapBufferType*> m_buffer;
uint32_t m_keyCount;
uint32_t m_deleteCount;
uint32_t m_capacity;
};
} // namespace JSC