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// Copyright (C) 2016 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 "qv4debugjob.h"
#include <private/qqmlcontext_p.h>
#include <private/qqmldebugservice_p.h>
#include <private/qv4jscall_p.h>
#include <private/qv4qmlcontext_p.h>
#include <private/qv4qobjectwrapper_p.h>
#include <private/qv4script_p.h>
#include <private/qv4stackframe_p.h>
#include <QtQml/qqmlengine.h>
#include <QtCore/qpointer.h>
QT_BEGIN_NAMESPACE
QV4DebugJob::~QV4DebugJob()
{
}
JavaScriptJob::JavaScriptJob(QV4::ExecutionEngine *engine, int frameNr, int context,
const QString &script) :
engine(engine), frameNr(frameNr), context(context), script(script),
resultIsException(false)
{}
void JavaScriptJob::run()
{
QV4::Scope scope(engine);
QV4::ScopedContext ctx(scope, engine->currentStackFrame ? engine->currentContext()
: engine->scriptContext());
QV4::CppStackFrame *frame = engine->currentStackFrame;
for (int i = 0; frame && i < frameNr; ++i)
frame = frame->parentFrame();
if (frameNr > 0 && frame)
ctx = frame->context();
if (context >= 0) {
QObject *forId = QQmlDebugService::objectForId(context);
QQmlContext *extraContext = qmlContext(forId);
if (extraContext)
ctx = QV4::QmlContext::create(ctx, QQmlContextData::get(extraContext), forId);
} else if (frameNr < 0) { // Use QML context if available
QQmlEngine *qmlEngine = engine->qmlEngine();
if (qmlEngine) {
QQmlContext *qmlRootContext = qmlEngine->rootContext();
QQmlContextPrivate *ctxtPriv = QQmlContextPrivate::get(qmlRootContext);
QV4::ScopedObject withContext(scope, engine->newObject());
QV4::ScopedString k(scope);
QV4::ScopedValue v(scope);
const QList<QPointer<QObject>> instances = ctxtPriv->instances();
for (const QPointer<QObject> &object : instances) {
if (QQmlContext *context = qmlContext(object.data())) {
if (QQmlRefPointer<QQmlContextData> cdata = QQmlContextData::get(context)) {
v = QV4::QObjectWrapper::wrap(engine, object);
k = engine->newString(cdata->findObjectId(object));
withContext->put(k, v);
}
}
}
if (!engine->qmlContext())
ctx = QV4::QmlContext::create(ctx, QQmlContextData::get(qmlRootContext), nullptr);
}
}
QV4::Script script(ctx, QV4::Compiler::ContextType::Eval, this->script);
if (const QV4::Function *function = frame ? frame->v4Function : engine->globalCode)
script.setStrictMode(function->isStrict());
// In order for property lookups in QML to work, we need to disable fast v4 lookups. That
// is a side-effect of inheritContext.
script.setInheritContext();
script.parse();
QV4::ScopedValue result(scope);
if (!scope.hasException()) {
if (frame) {
QV4::ScopedValue thisObject(scope, frame->thisObject());
result = script.run(thisObject);
} else {
result = script.run();
}
}
if (scope.hasException()) {
result = scope.engine->catchException();
resultIsException = true;
}
handleResult(result);
}
bool JavaScriptJob::hasExeption() const
{
return resultIsException;
}
BacktraceJob::BacktraceJob(QV4DataCollector *collector, int fromFrame, int toFrame) :
CollectJob(collector), fromFrame(fromFrame), toFrame(toFrame)
{
}
void BacktraceJob::run()
{
QJsonArray frameArray;
QList<QV4::StackFrame> frames = collector->engine()->stackTrace(toFrame);
for (int i = fromFrame; i < toFrame && i < frames.size(); ++i)
frameArray.push_back(collector->buildFrame(frames[i], i));
if (frameArray.isEmpty()) {
result.insert(QStringLiteral("totalFrames"), 0);
} else {
result.insert(QStringLiteral("fromFrame"), fromFrame);
result.insert(QStringLiteral("toFrame"), fromFrame + frameArray.size());
result.insert(QStringLiteral("frames"), frameArray);
}
}
FrameJob::FrameJob(QV4DataCollector *collector, int frameNr) :
CollectJob(collector), frameNr(frameNr), success(false)
{
}
void FrameJob::run()
{
QList<QV4::StackFrame> frames = collector->engine()->stackTrace(frameNr + 1);
if (frameNr >= frames.size()) {
success = false;
} else {
result = collector->buildFrame(frames[frameNr], frameNr);
success = true;
}
}
bool FrameJob::wasSuccessful() const
{
return success;
}
ScopeJob::ScopeJob(QV4DataCollector *collector, int frameNr, int scopeNr) :
CollectJob(collector), frameNr(frameNr), scopeNr(scopeNr), success(false)
{
}
void ScopeJob::run()
{
QJsonObject object;
success = collector->collectScope(&object, frameNr, scopeNr);
if (success) {
QList<QV4::Heap::ExecutionContext::ContextType> scopeTypes =
collector->getScopeTypes(frameNr);
result[QLatin1String("type")] = QV4DataCollector::encodeScopeType(scopeTypes[scopeNr]);
} else {
result[QLatin1String("type")] = -1;
}
result[QLatin1String("index")] = scopeNr;
result[QLatin1String("frameIndex")] = frameNr;
result[QLatin1String("object")] = object;
}
bool ScopeJob::wasSuccessful() const
{
return success;
}
ValueLookupJob::ValueLookupJob(const QJsonArray &handles, QV4DataCollector *collector) :
CollectJob(collector), handles(handles) {}
void ValueLookupJob::run()
{
// Open a QML context if we don't have one, yet. We might run into QML objects when looking up
// refs and that will crash without a valid QML context. Mind that engine->qmlContext() is only
// set if the engine is currently executing QML code.
QScopedPointer<QObject> scopeObject;
QV4::ExecutionEngine *engine = collector->engine();
QV4::Scope scope(engine);
QV4::Heap::ExecutionContext *qmlContext = engine->qmlContext();
if (engine->qmlEngine() && !qmlContext) {
scopeObject.reset(new QObject);
qmlContext = QV4::QmlContext::create(engine->currentContext(),
QQmlContextData::get(engine->qmlEngine()->rootContext()),
scopeObject.data());
}
QV4::Scoped<QV4::ExecutionContext> scopedContext(scope, qmlContext);
QV4::ScopedStackFrame frame(scope, scopedContext);
for (const QJsonValue handle : handles) {
QV4DataCollector::Ref ref = handle.toInt();
if (!collector->isValidRef(ref)) {
exception = QString::fromLatin1("Invalid Ref: %1").arg(ref);
break;
}
result[QString::number(ref)] = collector->lookupRef(ref);
}
}
const QString &ValueLookupJob::exceptionMessage() const
{
return exception;
}
ExpressionEvalJob::ExpressionEvalJob(QV4::ExecutionEngine *engine, int frameNr,
int context, const QString &expression,
QV4DataCollector *collector) :
JavaScriptJob(engine, frameNr, context, expression), collector(collector)
{
}
void ExpressionEvalJob::handleResult(QV4::ScopedValue &value)
{
if (hasExeption())
exception = value->toQStringNoThrow();
result = collector->lookupRef(collector->addValueRef(value));
}
const QString &ExpressionEvalJob::exceptionMessage() const
{
return exception;
}
const QJsonObject &ExpressionEvalJob::returnValue() const
{
return result;
}
GatherSourcesJob::GatherSourcesJob(QV4::ExecutionEngine *engine)
: engine(engine)
{}
void GatherSourcesJob::run()
{
const auto compilationUnits = engine->compilationUnits();
for (const auto &unit : compilationUnits) {
QString fileName = unit->fileName();
if (!fileName.isEmpty())
sources.append(fileName);
}
}
const QStringList &GatherSourcesJob::result() const
{
return sources;
}
EvalJob::EvalJob(QV4::ExecutionEngine *engine, const QString &script) :
JavaScriptJob(engine, /*frameNr*/-1, /*context*/ -1, script), result(false)
{}
void EvalJob::handleResult(QV4::ScopedValue &result)
{
this->result = result->toBoolean();
}
bool EvalJob::resultAsBoolean() const
{
return result;
}
QT_END_NAMESPACE