JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / runtime / PropertyTable.cpp

/*
 * Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
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 * 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
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#include "config.h"
#include "PropertyMapHashTable.h"

#include "JSCJSValueInlines.h"
#include "JSCellInlines.h"
#include "SlotVisitorInlines.h"
#include "StructureInlines.h"

#include <wtf/CryptographicallyRandomNumber.h>

namespace JSC {

const ClassInfo PropertyTable::s_info = { "PropertyTable", 0, 0, CREATE_METHOD_TABLE(PropertyTable) };

PropertyTable* PropertyTable::create(VM& vm, unsigned initialCapacity)
{
    PropertyTable* table = new (NotNull, allocateCell<PropertyTable>(vm.heap)) PropertyTable(vm, initialCapacity);
    table->finishCreation(vm);
    return table;
}

PropertyTable* PropertyTable::clone(VM& vm, const PropertyTable& other)
{
    PropertyTable* table = new (NotNull, allocateCell<PropertyTable>(vm.heap)) PropertyTable(vm, other);
    table->finishCreation(vm);
    return table;
}

PropertyTable* PropertyTable::clone(VM& vm, unsigned initialCapacity, const PropertyTable& other)
{
    PropertyTable* table = new (NotNull, allocateCell<PropertyTable>(vm.heap)) PropertyTable(vm, initialCapacity, other);
    table->finishCreation(vm);
    return table;
}

PropertyTable::PropertyTable(VM& vm, unsigned initialCapacity)
    : JSCell(vm, vm.propertyTableStructure.get())
    , m_indexSize(sizeForCapacity(initialCapacity))
    , m_indexMask(m_indexSize - 1)
    , m_index(static_cast<unsigned*>(fastZeroedMalloc(dataSize())))
    , m_keyCount(0)
    , m_deletedCount(0)
{
    ASSERT(isPowerOf2(m_indexSize));
}

PropertyTable::PropertyTable(VM& vm, const PropertyTable& other)
    : JSCell(vm, vm.propertyTableStructure.get())
    , m_indexSize(other.m_indexSize)
    , m_indexMask(other.m_indexMask)
    , m_index(static_cast<unsigned*>(fastMalloc(dataSize())))
    , m_keyCount(other.m_keyCount)
    , m_deletedCount(other.m_deletedCount)
{
    ASSERT(isPowerOf2(m_indexSize));

    memcpy(m_index, other.m_index, dataSize());

    iterator end = this->end();
    for (iterator iter = begin(); iter != end; ++iter)
        iter->key->ref();

    // Copy the m_deletedOffsets vector.
    Vector<PropertyOffset>* otherDeletedOffsets = other.m_deletedOffsets.get();
    if (otherDeletedOffsets)
        m_deletedOffsets = std::make_unique<Vector<PropertyOffset>>(*otherDeletedOffsets);
}

PropertyTable::PropertyTable(VM& vm, unsigned initialCapacity, const PropertyTable& other)
    : JSCell(vm, vm.propertyTableStructure.get())
    , m_indexSize(sizeForCapacity(initialCapacity))
    , m_indexMask(m_indexSize - 1)
    , m_index(static_cast<unsigned*>(fastZeroedMalloc(dataSize())))
    , m_keyCount(0)
    , m_deletedCount(0)
{
    ASSERT(isPowerOf2(m_indexSize));
    ASSERT(initialCapacity >= other.m_keyCount);

    const_iterator end = other.end();
    for (const_iterator iter = other.begin(); iter != end; ++iter) {
        ASSERT(canInsert());
        reinsert(*iter);
        iter->key->ref();
    }

    // Copy the m_deletedOffsets vector.
    Vector<PropertyOffset>* otherDeletedOffsets = other.m_deletedOffsets.get();
    if (otherDeletedOffsets)
        m_deletedOffsets = std::make_unique<Vector<PropertyOffset>>(*otherDeletedOffsets);
}

void PropertyTable::destroy(JSCell* cell)
{
    static_cast<PropertyTable*>(cell)->PropertyTable::~PropertyTable();
}

PropertyTable::~PropertyTable()
{
    iterator end = this->end();
    for (iterator iter = begin(); iter != end; ++iter)
        iter->key->deref();

    fastFree(m_index);
}

} // namespace JSC