qqmlscriptdata.cpp

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// Copyright (C) 2019 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
// Qt-Security score:significant
 
#include <private/qqmlscriptdata_p.h>
#include <private/qqmlcontext_p.h>
#include <private/qqmlengine_p.h>
#include <private/qqmlscriptblob_p.h>
#include <private/qv4engine_p.h>
#include <private/qv4scopedvalue_p.h>
#include <private/qv4object_p.h>
#include <private/qv4qmlcontext_p.h>
#include <private/qv4module_p.h>
 
QT_BEGIN_NAMESPACE
 
QQmlRefPointer<QQmlContextData> QQmlScriptData::qmlContextDataForContext(
        const QQmlRefPointer<QQmlContextData> &parentQmlContextData)
{
    Q_ASSERT(parentQmlContextData && parentQmlContextData->engine());
 
    if (!m_precompiledScript || m_precompiledScript->isESModule())
        return nullptr;
 
    QQmlRefPointer<QQmlContextData> qmlContextData = m_precompiledScript->isSharedLibrary()
            ? QQmlContextData::createRefCounted(QQmlRefPointer<QQmlContextData>())
            : QQmlContextData::createRefCounted(parentQmlContextData);
 
    qmlContextData->setInternal(true);
    qmlContextData->setJSContext(true);
    if (m_precompiledScript->isSharedLibrary())
        qmlContextData->setPragmaLibraryContext(true);
    else
        qmlContextData->setPragmaLibraryContext(parentQmlContextData->isPragmaLibraryContext());
    qmlContextData->setBaseUrl(url);
    qmlContextData->setBaseUrlString(urlString);
    QV4::ExecutionEngine *v4 = parentQmlContextData->engine()->handle();
 
    // For backward compatibility, if there are no imports, we need to use the
    // imports from the parent context.  See QTBUG-17518.
    if (!typeNameCache->isEmpty()) {
        qmlContextData->setImports(typeNameCache);
    } else if (!m_precompiledScript->isSharedLibrary()) {
        qmlContextData->setImports(parentQmlContextData->imports());
        qmlContextData->setImportedScripts(v4,  parentQmlContextData->importedScripts());
    }
 
    if (m_precompiledScript->isSharedLibrary())
        qmlContextData->setEngine(parentQmlContextData->engine()); // Fix for QTBUG-21620
 
    QV4::Scope scope(v4);
    QV4::ScopedObject scriptsArray(scope);
    if (QV4::Value::fromReturnedValue(qmlContextData->importedScripts()).isNullOrUndefined()) {
        scriptsArray = v4->newArrayObject(scripts.size());
        qmlContextData->setImportedScripts(v4, scriptsArray);
    } else {
        scriptsArray = qmlContextData->importedScripts();
    }
    QV4::ScopedValue v(scope);
    for (int ii = 0; ii < scripts.size(); ++ii) {
        v = scripts.at(ii)->scriptValueForContext(qmlContextData);
        scriptsArray->put(ii, v);
    }
 
    return qmlContextData;
}
 
QV4::ReturnedValue QQmlScriptData::scriptValueForContext(
        const QQmlRefPointer<QQmlContextData> &parentQmlContextData)
{
    QV4::ExecutionEngine *v4 = parentQmlContextData->engine()->handle();
    return handleOwnScriptValueOrExecutableCU(
            v4, [&](const QQmlRefPointer<QV4::ExecutableCompilationUnit> &executableCU) {
        QV4::Scope scope(v4);
        QV4::ScopedValue value(scope, executableCU->value());
        if (!value->isEmpty())
            return value->asReturnedValue();
 
        QV4::Scoped<QV4::QmlContext> qmlExecutionContext(scope);
        if (auto qmlContextData = qmlContextDataForContext(parentQmlContextData)) {
            qmlExecutionContext = QV4::QmlContext::create(
                    v4->rootContext(), std::move(qmlContextData), /* scopeObject: */ nullptr);
        }
 
        QV4::Scoped<QV4::Module> module(scope, executableCU->instantiate());
        if (module) {
            if (qmlExecutionContext) {
                module->d()->scope->outer.set(v4, qmlExecutionContext->d());
                qmlExecutionContext->d()->qml()->module.set(v4, module->d());
            }
 
            module->evaluate();
        }
 
        if (v4->hasException) {
            QQmlError error = v4->catchExceptionAsQmlError();
            if (error.isValid())
                QQmlEnginePrivate::get(v4)->warning(error);
        }
 
        if (qmlExecutionContext)
            value = qmlExecutionContext->d()->qml();
        else if (module)
            value = module->d();
 
        if (m_precompiledScript->isSharedLibrary() || m_precompiledScript->isESModule())
            executableCU->setValue(value);
 
        return value->asReturnedValue();
    });
}
 
QT_END_NAMESPACE