qv4identifierhashdata_p.h

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QV4IDENTIFIERHASHDATA_H
#define QV4IDENTIFIERHASHDATA_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <private/qv4global_p.h>
#include <private/qv4propertykey_p.h>
#include <private/qv4identifiertable_p.h>
#include <QtCore/qatomic.h>
 
QT_BEGIN_NAMESPACE
 
namespace QV4 {
 
struct IdentifierHashEntry {
    PropertyKey identifier;
    int value;
};
 
struct IdentifierHashData
{
    IdentifierHashData(IdentifierTable *table, int numBits)
        : size(0)
        , numBits(numBits)
        , identifierTable(table)
    {
        refCount.storeRelaxed(1);
        alloc = qPrimeForNumBits(numBits);
        entries = (IdentifierHashEntry *)malloc(alloc*sizeof(IdentifierHashEntry));
        memset(entries, 0, alloc*sizeof(IdentifierHashEntry));
        identifierTable->addIdentifierHash(this);
    }
 
    explicit IdentifierHashData(IdentifierHashData *other)
        : size(other->size)
        , numBits(other->numBits)
        , identifierTable(other->identifierTable)
    {
        refCount.storeRelaxed(1);
        alloc = other->alloc;
        entries = (IdentifierHashEntry *)malloc(alloc*sizeof(IdentifierHashEntry));
        memcpy(entries, other->entries, alloc*sizeof(IdentifierHashEntry));
        identifierTable->addIdentifierHash(this);
    }
 
    ~IdentifierHashData() {
        free(entries);
        if (identifierTable)
            identifierTable->removeIdentifierHash(this);
    }
 
    void markObjects(MarkStack *markStack) const
    {
        IdentifierHashEntry *e = entries;
        IdentifierHashEntry *end = e + alloc;
        while (e < end) {
            if (Heap::Base *o = e->identifier.asStringOrSymbol())
                o->mark(markStack);
            ++e;
        }
    }
 
    QBasicAtomicInt refCount;
    int alloc;
    int size;
    int numBits;
    IdentifierTable *identifierTable;
    IdentifierHashEntry *entries;
};
 
} // namespace QV4
 
QT_END_NAMESPACE
 
#endif // QV4IDENTIFIERHASHDATA_P_H