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#include <qv4argumentsobject_p.h>
#include <qv4alloca_p.h>
#include <qv4scopedvalue_p.h>
#include <qv4string_p.h>
#include <qv4function_p.h>

using namespace QV4;

DEFINE_OBJECT_VTABLE(ArgumentsObject);

void Heap::ArgumentsObject::init(QV4::CallContext *context, bool strict)
{
    ExecutionEngine *v4 = internalClass->engine;

    Object::init();
    fullyCreated = false;
    isStrict = strict;
    this->context.set(v4, context->d());
    Q_ASSERT(vtable() == QV4::ArgumentsObject::staticVTable());

    Scope scope(v4);
    Scoped<QV4::ArgumentsObject> args(scope, this);

    if (isStrict) {
        Q_ASSERT(CalleePropertyIndex == args->internalClass()->find(v4->id_callee()));
        Q_ASSERT(CallerPropertyIndex == args->internalClass()->find(v4->id_caller()));
        args->setProperty(CalleePropertyIndex + QV4::Object::GetterOffset, *v4->thrower());
        args->setProperty(CalleePropertyIndex + QV4::Object::SetterOffset, *v4->thrower());
        args->setProperty(CallerPropertyIndex + QV4::Object::GetterOffset, *v4->thrower());
        args->setProperty(CallerPropertyIndex + QV4::Object::SetterOffset, *v4->thrower());

        args->arrayReserve(context->argc());
        args->arrayPut(0, context->args(), context->argc());
        args->d()->fullyCreated = true;
    } else {
        Q_ASSERT(CalleePropertyIndex == args->internalClass()->find(v4->id_callee()));
        args->setProperty(CalleePropertyIndex, context->d()->function);
    }
    Q_ASSERT(LengthPropertyIndex == args->internalClass()->find(v4->id_length()));
    args->setProperty(LengthPropertyIndex, Primitive::fromInt32(context->argc()));
}

void ArgumentsObject::fullyCreate()
{
    if (fullyCreated())
        return;

    Scope scope(engine());

    uint argCount = context()->argc();
    uint numAccessors = qMin(context()->formalParameterCount(), argCount);
    ArrayData::realloc(this, Heap::ArrayData::Sparse, argCount, true);
    scope.engine->requireArgumentsAccessors(numAccessors);

    Scoped<MemberData> md(scope, d()->mappedArguments);
    if (numAccessors) {
        d()->mappedArguments.set(scope.engine, md->allocate(scope.engine, numAccessors));
        for (uint i = 0; i < numAccessors; ++i) {
            d()->mappedArguments->values.set(scope.engine, i, context()->args()[i]);
            arraySet(i, scope.engine->argumentsAccessors + i, Attr_Accessor);
        }
    }
    arrayPut(numAccessors, context()->args() + numAccessors, argCount - numAccessors);
    for (uint i = numAccessors; i < argCount; ++i)
        setArrayAttributes(i, Attr_Data);

    d()->fullyCreated = true;
}

bool ArgumentsObject::defineOwnProperty(ExecutionEngine *engine, uint index, const Property *desc, PropertyAttributes attrs)
{
    fullyCreate();

    Scope scope(engine);
    ScopedProperty map(scope);
    PropertyAttributes mapAttrs;
    uint numAccessors = qMin(context()->formalParameterCount(), static_cast<uint>(context()->argc()));
    bool isMapped = false;
    if (arrayData() && index < numAccessors &&
        arrayData()->attributes(index).isAccessor() &&
        arrayData()->get(index) == scope.engine->argumentsAccessors[index].getter()->asReturnedValue())
        isMapped = true;

    if (isMapped) {
        Q_ASSERT(arrayData());
        mapAttrs = arrayData()->attributes(index);
        arrayData()->getProperty(index, map, &mapAttrs);
        setArrayAttributes(index, Attr_Data);
        ArrayData::Index arrayIndex{ arrayData(), arrayData()->mappedIndex(index) };
        arrayIndex.set(scope.engine, d()->mappedArguments->values[index]);
    }

    bool result = Object::defineOwnProperty2(scope.engine, index, desc, attrs);
    if (!result) {
        if (d()->isStrict)
            return engine->throwTypeError();
        return false;
    }

    if (isMapped && attrs.isData()) {
        Q_ASSERT(arrayData());
        ScopedFunctionObject setter(scope, map->setter());
        ScopedCallData callData(scope, 1);
        callData->thisObject = this->asReturnedValue();
        callData->args[0] = desc->value;
        setter->call(callData);

        if (attrs.isWritable()) {
            setArrayAttributes(index, mapAttrs);
            arrayData()->setProperty(engine, index, map);
        }
    }

    return result;
}

ReturnedValue ArgumentsObject::getIndexed(const Managed *m, uint index, bool *hasProperty)
{
    const ArgumentsObject *args = static_cast<const ArgumentsObject *>(m);
    if (args->fullyCreated())
        return Object::getIndexed(m, index, hasProperty);

    if (index < static_cast<uint>(args->context()->argc())) {
        if (hasProperty)
            *hasProperty = true;
        return args->context()->args()[index].asReturnedValue();
    }
    if (hasProperty)
        *hasProperty = false;
    return Encode::undefined();
}

bool ArgumentsObject::putIndexed(Managed *m, uint index, const Value &value)
{
    ArgumentsObject *args = static_cast<ArgumentsObject *>(m);
    if (!args->fullyCreated() && index >= static_cast<uint>(args->context()->argc()))
        args->fullyCreate();

    if (args->fullyCreated())
        return Object::putIndexed(m, index, value);

    args->context()->setArg(index, value);
    return true;
}

bool ArgumentsObject::deleteIndexedProperty(Managed *m, uint index)
{
    ArgumentsObject *args = static_cast<ArgumentsObject *>(m);
    if (!args->fullyCreated())
        args->fullyCreate();
    return Object::deleteIndexedProperty(m, index);
}

PropertyAttributes ArgumentsObject::queryIndexed(const Managed *m, uint index)
{
    const ArgumentsObject *args = static_cast<const ArgumentsObject *>(m);
    if (args->fullyCreated())
        return Object::queryIndexed(m, index);

    uint numAccessors = qMin((int)args->context()->formalParameterCount(), args->context()->argc());
    uint argCount = args->context()->argc();
    if (index >= argCount)
        return PropertyAttributes();
    if (index >= numAccessors)
        return Attr_Data;
    return Attr_Accessor;
}

DEFINE_OBJECT_VTABLE(ArgumentsGetterFunction);

ReturnedValue ArgumentsGetterFunction::call(const Managed *getter, CallData *callData)
{
    ExecutionEngine *v4 = static_cast<const ArgumentsGetterFunction *>(getter)->engine();
    Scope scope(v4);
    Scoped<ArgumentsGetterFunction> g(scope, static_cast<const ArgumentsGetterFunction *>(getter));
    Scoped<ArgumentsObject> o(scope, callData->thisObject.as<ArgumentsObject>());
    if (!o)
        return v4->throwTypeError();

    Q_ASSERT(g->index() < static_cast<unsigned>(o->context()->argc()));
    return o->context()->args()[g->index()].asReturnedValue();
}

DEFINE_OBJECT_VTABLE(ArgumentsSetterFunction);

ReturnedValue ArgumentsSetterFunction::call(const Managed *setter, CallData *callData)
{
    ExecutionEngine *v4 = static_cast<const ArgumentsSetterFunction *>(setter)->engine();
    Scope scope(v4);
    Scoped<ArgumentsSetterFunction> s(scope, static_cast<const ArgumentsSetterFunction *>(setter));
    Scoped<ArgumentsObject> o(scope, callData->thisObject.as<ArgumentsObject>());
    if (!o)
        return v4->throwTypeError();

    Q_ASSERT(s->index() < static_cast<unsigned>(o->context()->argc()));
    o->context()->setArg(s->index(), (callData->argc ? callData->args[0] : Primitive::undefinedValue()));
    return Encode::undefined();
}

uint ArgumentsObject::getLength(const Managed *m)
{
    const ArgumentsObject *a = static_cast<const ArgumentsObject *>(m);
    if (a->propertyData(Heap::ArgumentsObject::LengthPropertyIndex)->isInteger())
        return a->propertyData(Heap::ArgumentsObject::LengthPropertyIndex)->integerValue();
    return Primitive::toUInt32(a->propertyData(Heap::ArgumentsObject::LengthPropertyIndex)->doubleValue());
}