136 lines
5.0 KiB
C++
136 lines
5.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "WaiveXrayWrapper.h"
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#include "WrapperFactory.h"
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#include "jsapi.h"
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using namespace JS;
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namespace xpc {
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static bool
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WaiveAccessors(JSContext* cx, MutableHandle<PropertyDescriptor> desc)
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{
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if (desc.hasGetterObject() && desc.getterObject()) {
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RootedValue v(cx, JS::ObjectValue(*desc.getterObject()));
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if (!WrapperFactory::WaiveXrayAndWrap(cx, &v))
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return false;
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desc.setGetterObject(&v.toObject());
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}
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if (desc.hasSetterObject() && desc.setterObject()) {
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RootedValue v(cx, JS::ObjectValue(*desc.setterObject()));
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if (!WrapperFactory::WaiveXrayAndWrap(cx, &v))
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return false;
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desc.setSetterObject(&v.toObject());
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}
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return true;
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}
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bool
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WaiveXrayWrapper::getPropertyDescriptor(JSContext* cx, HandleObject wrapper, HandleId id,
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MutableHandle<PropertyDescriptor> desc) const
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{
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return CrossCompartmentWrapper::getPropertyDescriptor(cx, wrapper, id, desc) &&
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WrapperFactory::WaiveXrayAndWrap(cx, desc.value()) && WaiveAccessors(cx, desc);
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}
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bool
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WaiveXrayWrapper::getOwnPropertyDescriptor(JSContext* cx, HandleObject wrapper, HandleId id,
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MutableHandle<PropertyDescriptor> desc) const
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{
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return CrossCompartmentWrapper::getOwnPropertyDescriptor(cx, wrapper, id, desc) &&
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WrapperFactory::WaiveXrayAndWrap(cx, desc.value()) && WaiveAccessors(cx, desc);
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}
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bool
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WaiveXrayWrapper::get(JSContext* cx, HandleObject wrapper, HandleValue receiver, HandleId id,
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MutableHandleValue vp) const
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{
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return CrossCompartmentWrapper::get(cx, wrapper, receiver, id, vp) &&
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WrapperFactory::WaiveXrayAndWrap(cx, vp);
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}
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bool
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WaiveXrayWrapper::enumerate(JSContext* cx, HandleObject proxy,
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MutableHandleObject objp) const
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{
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return CrossCompartmentWrapper::enumerate(cx, proxy, objp) &&
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WrapperFactory::WaiveXrayAndWrap(cx, objp);
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}
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bool
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WaiveXrayWrapper::call(JSContext* cx, HandleObject wrapper, const JS::CallArgs& args) const
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{
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return CrossCompartmentWrapper::call(cx, wrapper, args) &&
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WrapperFactory::WaiveXrayAndWrap(cx, args.rval());
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}
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bool
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WaiveXrayWrapper::construct(JSContext* cx, HandleObject wrapper, const JS::CallArgs& args) const
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{
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return CrossCompartmentWrapper::construct(cx, wrapper, args) &&
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WrapperFactory::WaiveXrayAndWrap(cx, args.rval());
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}
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// NB: This is important as the other side of a handshake with FieldGetter. See
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// nsXBLProtoImplField.cpp.
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bool
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WaiveXrayWrapper::nativeCall(JSContext* cx, JS::IsAcceptableThis test,
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JS::NativeImpl impl, const JS::CallArgs& args) const
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{
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return CrossCompartmentWrapper::nativeCall(cx, test, impl, args) &&
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WrapperFactory::WaiveXrayAndWrap(cx, args.rval());
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}
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bool
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WaiveXrayWrapper::hasInstance(JSContext* cx, HandleObject wrapper,
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MutableHandleValue v, bool* bp) const {
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if (v.isObject() && WrapperFactory::IsXrayWrapper(&v.toObject())) {
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// If |v| is an XrayWrapper and in the same compartment as the value
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// wrapped by |wrapper|, then the Xrays of |v| would be waived upon
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// calling CrossCompartmentWrapper::hasInstance. This may trigger
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// getters and proxy traps of unwrapped |v|. To prevent that from
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// happening, we exit early.
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// |wrapper| is the right operand of "instanceof", and must either be
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// a function or an object with a @@hasInstance method. We are not going
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// to call @@hasInstance, so only check whether it is a function.
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// This check is here for consistency with usual "instanceof" behavior,
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// which throws if the right operand is not a function. Without this
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// check, the "instanceof" operator would return false and potentially
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// hide errors in the code that uses the "instanceof" operator.
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if (!JS::IsCallable(wrapper)) {
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RootedValue wrapperv(cx, JS::ObjectValue(*wrapper));
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js::ReportIsNotFunction(cx, wrapperv);
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return false;
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}
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*bp = false;
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return true;
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}
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// Both |wrapper| and |v| have no Xrays here.
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return CrossCompartmentWrapper::hasInstance(cx, wrapper, v, bp);
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}
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bool
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WaiveXrayWrapper::getPrototype(JSContext* cx, HandleObject wrapper, MutableHandleObject protop) const
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{
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return CrossCompartmentWrapper::getPrototype(cx, wrapper, protop) &&
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(!protop || WrapperFactory::WaiveXrayAndWrap(cx, protop));
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}
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bool
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WaiveXrayWrapper::getPrototypeIfOrdinary(JSContext* cx, HandleObject wrapper, bool* isOrdinary,
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MutableHandleObject protop) const
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{
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return CrossCompartmentWrapper::getPrototypeIfOrdinary(cx, wrapper, isOrdinary, protop) &&
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(!protop || WrapperFactory::WaiveXrayAndWrap(cx, protop));
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}
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} // namespace xpc
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