bool eventListenerHandlerLocation(Document* document, EventListener* eventListener, String& sourceName, int& lineNumber)
{
    const JSEventListener* jsListener = JSEventListener::cast(eventListener);
    if (!jsListener)
        return false;
    JSC::JSObject* jsObject = jsListener->jsFunction(document);
    if (!jsObject)
        return false;
    JSC::JSFunction* jsFunction = static_cast<JSFunction*>(jsObject);
    if (!jsFunction || jsFunction->isHostFunction())
        return false;
    JSC::FunctionExecutable* funcExecutable = jsFunction->jsExecutable();
    if (!funcExecutable)
        return false;
    lineNumber = funcExecutable->lineNo();
    sourceName = ustringToString(funcExecutable->sourceURL());
    return true;
}
bool eventListenerHandlerLocation(Document* document, EventListener* eventListener, String& sourceName, String& scriptId, int& lineNumber)
{
    const JSEventListener* jsListener = JSEventListener::cast(eventListener);
    ASSERT(jsListener);
    if (!jsListener)
        return false;
    JSLockHolder lock(jsListener->isolatedWorld()->globalData());
    JSC::JSObject* jsObject = jsListener->jsFunction(document);
    if (!jsObject)
        return false;
    JSC::JSFunction* jsFunction = jsDynamicCast<JSFunction*>(jsObject);
    if (!jsFunction || jsFunction->isHostFunction())
        return false;
    JSC::FunctionExecutable* funcExecutable = jsFunction->jsExecutable();
    if (!funcExecutable)
        return false;
    lineNumber = funcExecutable->lineNo() - 1;
    intptr_t funcSourceId = funcExecutable->sourceID();
    scriptId = funcSourceId == SourceProvider::nullID ? "" : String::number(funcSourceId);
    sourceName = funcExecutable->sourceURL();
    return true;
}
/*!
  \internal
*/
QScriptContextInfoPrivate::QScriptContextInfoPrivate(const QScriptContext *context)
{
    Q_ASSERT(context);
    functionType = QScriptContextInfo::NativeFunction;
    functionMetaIndex = -1;
    functionStartLineNumber = -1;
    functionEndLineNumber = -1;
    scriptId = -1;
    lineNumber = -1;
    columnNumber = -1;

    JSC::CallFrame *frame = const_cast<JSC::CallFrame *>(QScriptEnginePrivate::frameForContext(context));

    // Get the line number:

    //We need to know the context directly up in the backtrace, in order to get the line number, and adjust the global context
    JSC::CallFrame *rewindContext = QScriptEnginePrivate::get(context->engine())->currentFrame;
    if (QScriptEnginePrivate::contextForFrame(rewindContext) == context) {  //top context
        frame = rewindContext; //for retreiving the global context's "fake" frame
        // An agent might have provided the line number.
        lineNumber = QScript::scriptEngineFromExec(frame)->agentLineNumber;
        if (lineNumber == -1)
            lineNumber = QScript::scriptEngineFromExec(frame)->uncaughtExceptionLineNumber;
    } else {
        // rewind the stack from the top in order to find the frame from the caller where the returnPC is stored
        while (rewindContext && QScriptEnginePrivate::contextForFrame(rewindContext->callerFrame()->removeHostCallFrameFlag()) != context)
            rewindContext = rewindContext->callerFrame()->removeHostCallFrameFlag();
        if (rewindContext) {
            frame = rewindContext->callerFrame()->removeHostCallFrameFlag(); //for retreiving the global context's "fake" frame

            JSC::Instruction *returnPC = rewindContext->returnPC();
            JSC::CodeBlock *codeBlock = frame->codeBlock();
            if (returnPC && codeBlock && QScriptEnginePrivate::hasValidCodeBlockRegister(frame)) {
#if ENABLE(JIT)
                JSC::JITCode code = codeBlock->getJITCode();
                uintptr_t jitOffset = reinterpret_cast<uintptr_t>(JSC::ReturnAddressPtr(returnPC).value()) - reinterpret_cast<uintptr_t>(code.addressForCall().executableAddress());
                // We can only use the JIT code offset if it's smaller than the JIT size;
                // otherwise calling getBytecodeIndex() is meaningless.
                if (jitOffset < code.size()) {
                    unsigned bytecodeOffset = codeBlock->getBytecodeIndex(frame, JSC::ReturnAddressPtr(returnPC));
#else
                unsigned bytecodeOffset = returnPC - codeBlock->instructions().begin();
#endif
                bytecodeOffset--; //because returnPC is on the next instruction. We want the current one
                lineNumber = codeBlock->lineNumberForBytecodeOffset(const_cast<JSC::ExecState *>(frame), bytecodeOffset);
#if ENABLE(JIT)
                }
#endif
            }
        }
    }

    // Get the filename and the scriptId:
    JSC::CodeBlock *codeBlock = frame->codeBlock();
    if (codeBlock && QScriptEnginePrivate::hasValidCodeBlockRegister(frame)) {
           JSC::SourceProvider *source = codeBlock->source();
           scriptId = source->asID();
           fileName = source->url();
    }

    // Get the others information:
    JSC::JSObject *callee = frame->callee();
    if (callee && callee->inherits(&JSC::InternalFunction::info))
        functionName = JSC::asInternalFunction(callee)->name(frame);
    if (callee && callee->inherits(&JSC::JSFunction::info)
        && !JSC::asFunction(callee)->isHostFunction()) {
        functionType = QScriptContextInfo::ScriptFunction;
        JSC::FunctionExecutable *body = JSC::asFunction(callee)->jsExecutable();
        functionStartLineNumber = body->lineNo();
        functionEndLineNumber = body->lastLine();
        for (size_t i = 0; i < body->parameterCount(); ++i)
            parameterNames.append(body->parameterName(i));
        // ### get the function name from the AST
    } else if (callee && callee->inherits(&QScript::QtFunction::info)) {
        functionType = QScriptContextInfo::QtFunction;
        functionMetaIndex = static_cast<QScript::QtFunction*>(callee)->specificIndex(context);
        const QMetaObject *meta = static_cast<QScript::QtFunction*>(callee)->metaObject();
        if (meta != 0) {
            QMetaMethod method = meta->method(functionMetaIndex);
            QList<QByteArray> formals = method.parameterNames();
            for (int i = 0; i < formals.count(); ++i)
                parameterNames.append(QLatin1String(formals.at(i)));
        }
    }
    else if (callee && callee->inherits(&QScript::QtPropertyFunction::info)) {
        functionType = QScriptContextInfo::QtPropertyFunction;
        functionMetaIndex = static_cast<QScript::QtPropertyFunction*>(callee)->propertyIndex();
    }
}