100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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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 "JavaScriptChild.h"
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#include "mozilla/dom/ContentChild.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/ipc/MessageChannel.h"
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#include "nsContentUtils.h"
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#include "xpcprivate.h"
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#include "jsfriendapi.h"
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#include "AccessCheck.h"
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using namespace JS;
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using namespace mozilla;
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using namespace mozilla::jsipc;
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using mozilla::AutoSafeJSContext;
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static void
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UpdateChildWeakPointersBeforeSweepingZoneGroup(JSContext* cx, void* data)
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{
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static_cast<JavaScriptChild*>(data)->updateWeakPointers();
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}
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static void
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TraceChild(JSTracer* trc, void* data)
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{
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static_cast<JavaScriptChild*>(data)->trace(trc);
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}
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JavaScriptChild::~JavaScriptChild()
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{
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JSContext* cx = dom::danger::GetJSContext();
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JS_RemoveWeakPointerZoneGroupCallback(cx, UpdateChildWeakPointersBeforeSweepingZoneGroup);
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JS_RemoveExtraGCRootsTracer(cx, TraceChild, this);
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}
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bool
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JavaScriptChild::init()
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{
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if (!WrapperOwner::init())
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return false;
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if (!WrapperAnswer::init())
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return false;
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JSContext* cx = dom::danger::GetJSContext();
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JS_AddWeakPointerZoneGroupCallback(cx, UpdateChildWeakPointersBeforeSweepingZoneGroup, this);
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JS_AddExtraGCRootsTracer(cx, TraceChild, this);
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return true;
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}
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void
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JavaScriptChild::trace(JSTracer* trc)
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{
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objects_.trace(trc, strongReferenceObjIdMinimum_);
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}
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void
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JavaScriptChild::updateWeakPointers()
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{
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objects_.sweep();
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unwaivedObjectIds_.sweep();
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waivedObjectIds_.sweep();
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}
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JSObject*
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JavaScriptChild::scopeForTargetObjects()
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{
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// CPOWs from the parent need to point into the child's privileged junk
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// scope so that they can benefit from XrayWrappers in the child.
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return xpc::PrivilegedJunkScope();
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}
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bool
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JavaScriptChild::RecvDropTemporaryStrongReferences(const uint64_t& upToObjId)
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{
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strongReferenceObjIdMinimum_ = upToObjId + 1;
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return true;
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}
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PJavaScriptChild*
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mozilla::jsipc::NewJavaScriptChild()
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{
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JavaScriptChild* child = new JavaScriptChild();
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if (!child->init()) {
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delete child;
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return nullptr;
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}
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return child;
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}
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void
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mozilla::jsipc::ReleaseJavaScriptChild(PJavaScriptChild* child)
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{
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static_cast<JavaScriptChild*>(child)->decref();
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}
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