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path: root/js/xpconnect/wrappers/WaiveXrayWrapper.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=8 sts=4 et sw=4 tw=99: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "WaiveXrayWrapper.h"
#include "WrapperFactory.h"
#include "jsapi.h"

using namespace JS;

namespace xpc {

static bool
WaiveAccessors(JSContext* cx, MutableHandle<PropertyDescriptor> desc)
{
    if (desc.hasGetterObject() && desc.getterObject()) {
        RootedValue v(cx, JS::ObjectValue(*desc.getterObject()));
        if (!WrapperFactory::WaiveXrayAndWrap(cx, &v))
            return false;
        desc.setGetterObject(&v.toObject());
    }

    if (desc.hasSetterObject() && desc.setterObject()) {
        RootedValue v(cx, JS::ObjectValue(*desc.setterObject()));
        if (!WrapperFactory::WaiveXrayAndWrap(cx, &v))
            return false;
        desc.setSetterObject(&v.toObject());
    }
    return true;
}

bool
WaiveXrayWrapper::getPropertyDescriptor(JSContext* cx, HandleObject wrapper, HandleId id,
                                        MutableHandle<PropertyDescriptor> desc) const
{
    return CrossCompartmentWrapper::getPropertyDescriptor(cx, wrapper, id, desc) &&
           WrapperFactory::WaiveXrayAndWrap(cx, desc.value()) && WaiveAccessors(cx, desc);
}

bool
WaiveXrayWrapper::getOwnPropertyDescriptor(JSContext* cx, HandleObject wrapper, HandleId id,
                                           MutableHandle<PropertyDescriptor> desc) const
{
    return CrossCompartmentWrapper::getOwnPropertyDescriptor(cx, wrapper, id, desc) &&
           WrapperFactory::WaiveXrayAndWrap(cx, desc.value()) && WaiveAccessors(cx, desc);
}

bool
WaiveXrayWrapper::get(JSContext* cx, HandleObject wrapper, HandleValue receiver, HandleId id,
                      MutableHandleValue vp) const
{
    return CrossCompartmentWrapper::get(cx, wrapper, receiver, id, vp) &&
           WrapperFactory::WaiveXrayAndWrap(cx, vp);
}

bool
WaiveXrayWrapper::enumerate(JSContext* cx, HandleObject proxy,
                            MutableHandleObject objp) const
{
    return CrossCompartmentWrapper::enumerate(cx, proxy, objp) &&
           WrapperFactory::WaiveXrayAndWrap(cx, objp);
}

bool
WaiveXrayWrapper::call(JSContext* cx, HandleObject wrapper, const JS::CallArgs& args) const
{
    return CrossCompartmentWrapper::call(cx, wrapper, args) &&
           WrapperFactory::WaiveXrayAndWrap(cx, args.rval());
}

bool
WaiveXrayWrapper::construct(JSContext* cx, HandleObject wrapper, const JS::CallArgs& args) const
{
    return CrossCompartmentWrapper::construct(cx, wrapper, args) &&
           WrapperFactory::WaiveXrayAndWrap(cx, args.rval());
}

// NB: This is important as the other side of a handshake with FieldGetter. See
// nsXBLProtoImplField.cpp.
bool
WaiveXrayWrapper::nativeCall(JSContext* cx, JS::IsAcceptableThis test,
                             JS::NativeImpl impl, const JS::CallArgs& args) const
{
    return CrossCompartmentWrapper::nativeCall(cx, test, impl, args) &&
           WrapperFactory::WaiveXrayAndWrap(cx, args.rval());
}

bool
WaiveXrayWrapper::hasInstance(JSContext* cx, HandleObject wrapper,
                                   MutableHandleValue v, bool* bp) const {
  if (v.isObject() && WrapperFactory::IsXrayWrapper(&v.toObject())) {
    // If |v| is an XrayWrapper and in the same compartment as the value
    // wrapped by |wrapper|, then the Xrays of |v| would be waived upon
    // calling CrossCompartmentWrapper::hasInstance. This may trigger
    // getters and proxy traps of unwrapped |v|. To prevent that from
    // happening, we exit early.

    // |wrapper| is the right operand of "instanceof", and must either be
    // a function or an object with a @@hasInstance method. We are not going
    // to call @@hasInstance, so only check whether it is a function.
    // This check is here for consistency with usual "instanceof" behavior,
    // which throws if the right operand is not a function. Without this
    // check, the "instanceof" operator would return false and potentially
    // hide errors in the code that uses the "instanceof" operator.
    if (!JS::IsCallable(wrapper)) {
      RootedValue wrapperv(cx, JS::ObjectValue(*wrapper));
      js::ReportIsNotFunction(cx, wrapperv);
      return false;
    }

    *bp = false;
    return true;
  }

  // Both |wrapper| and |v| have no Xrays here.
  return CrossCompartmentWrapper::hasInstance(cx, wrapper, v, bp);
}

bool
WaiveXrayWrapper::getPrototype(JSContext* cx, HandleObject wrapper, MutableHandleObject protop) const
{
    return CrossCompartmentWrapper::getPrototype(cx, wrapper, protop) &&
           (!protop || WrapperFactory::WaiveXrayAndWrap(cx, protop));
}

bool
WaiveXrayWrapper::getPrototypeIfOrdinary(JSContext* cx, HandleObject wrapper, bool* isOrdinary,
                                         MutableHandleObject protop) const
{
    return CrossCompartmentWrapper::getPrototypeIfOrdinary(cx, wrapper, isOrdinary, protop) &&
           (!protop || WrapperFactory::WaiveXrayAndWrap(cx, protop));
}

} // namespace xpc