qscriptstaticscopeobject.cpp

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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtScript module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL-ONLY$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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**
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#include "config.h"
#include "qscriptstaticscopeobject_p.h"

namespace JSC
{
    ASSERT_CLASS_FITS_IN_CELL(QT_PREPEND_NAMESPACE(QScriptStaticScopeObject));
}

QT_BEGIN_NAMESPACE

const JSC::ClassInfo QScriptStaticScopeObject::info = { "QScriptStaticScopeObject", 0, 0, 0 };

QScriptStaticScopeObject::QScriptStaticScopeObject(WTF::NonNullPassRefPtr<JSC::Structure> structure,
                                                   int propertyCount, const PropertyInfo* props)
    : JSC::JSVariableObject(structure, new Data(/*canGrow=*/false))
{
    int index = growRegisterArray(propertyCount);
    for (int i = 0; i < propertyCount; ++i, --index) {
        const PropertyInfo& prop = props[i];
        JSC::SymbolTableEntry entry(index, prop.attributes);
        symbolTable().add(prop.identifier.ustring().rep(), entry);
        registerAt(index) = prop.value;
    }
}

QScriptStaticScopeObject::QScriptStaticScopeObject(WTF::NonNullPassRefPtr<JSC::Structure> structure)
    : JSC::JSVariableObject(structure, new Data(/*canGrow=*/true))
{
}

QScriptStaticScopeObject::~QScriptStaticScopeObject()
{
    delete d_ptr();
}

bool QScriptStaticScopeObject::getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertySlot& slot)
{
    return symbolTableGet(propertyName, slot);
}

bool QScriptStaticScopeObject::getOwnPropertyDescriptor(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertyDescriptor& descriptor)
{
    return symbolTableGet(propertyName, descriptor);
}

void QScriptStaticScopeObject::putWithAttributes(JSC::ExecState* exec, const JSC::Identifier &propertyName, JSC::JSValue value, unsigned attributes)
{
    if (symbolTablePutWithAttributes(propertyName, value, attributes))
        return;
    Q_ASSERT(d_ptr()->canGrow);
    addSymbolTableProperty(propertyName, value, attributes);
}

void QScriptStaticScopeObject::put(JSC::ExecState* exec, const JSC::Identifier& propertyName, JSC::JSValue value, JSC::PutPropertySlot&)
{
    if (symbolTablePut(propertyName, value))
        return;
    Q_ASSERT(d_ptr()->canGrow);
    addSymbolTableProperty(propertyName, value, /*attributes=*/0);
}

bool QScriptStaticScopeObject::deleteProperty(JSC::ExecState*, const JSC::Identifier&)
{
    return false;
}

void QScriptStaticScopeObject::markChildren(JSC::MarkStack& markStack)
{
    JSC::Register* registerArray = d_ptr()->registerArray.get();
    if (!registerArray)
        return;
    markStack.appendValues(reinterpret_cast<JSC::JSValue*>(registerArray), d_ptr()->registerArraySize);
}

void QScriptStaticScopeObject::addSymbolTableProperty(const JSC::Identifier& name, JSC::JSValue value, unsigned attributes)
{
    int index = growRegisterArray(1);
    JSC::SymbolTableEntry newEntry(index, attributes | JSC::DontDelete);
    symbolTable().add(name.ustring().rep(), newEntry);
    registerAt(index) = value;
}

int QScriptStaticScopeObject::growRegisterArray(int count)
{
    size_t oldSize = d_ptr()->registerArraySize;
    size_t newSize = oldSize + count;
    JSC::Register* registerArray = new JSC::Register[newSize];
    if (d_ptr()->registerArray)
        memcpy(registerArray + count, d_ptr()->registerArray.get(), oldSize * sizeof(JSC::Register));
    setRegisters(registerArray + newSize, registerArray);
    d_ptr()->registerArraySize = newSize;
    return -oldSize - 1;
}

QT_END_NAMESPACE