Add m-esr52 at 52.6.0

1 files changed, 100 insertions, 0 deletions

diff --git a/js/ipc/JavaScriptChild.cpp b/js/ipc/JavaScriptChild.cpp
new file mode 100644
index 000000000..1ba5a4ca9
--- /dev/null
+++ b/js/ipc/JavaScriptChild.cpp
@@ -0,0 +1,100 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=4 sw=4 et tw=80:
+ *
+ * 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 "JavaScriptChild.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/ipc/MessageChannel.h"
+#include "nsContentUtils.h"
+#include "xpcprivate.h"
+#include "jsfriendapi.h"
+#include "AccessCheck.h"
+
+using namespace JS;
+using namespace mozilla;
+using namespace mozilla::jsipc;
+
+using mozilla::AutoSafeJSContext;
+
+static void
+UpdateChildWeakPointersBeforeSweepingZoneGroup(JSContext* cx, void* data)
+{
+    static_cast<JavaScriptChild*>(data)->updateWeakPointers();
+}
+
+static void
+TraceChild(JSTracer* trc, void* data)
+{
+    static_cast<JavaScriptChild*>(data)->trace(trc);
+}
+
+JavaScriptChild::~JavaScriptChild()
+{
+    JSContext* cx = dom::danger::GetJSContext();
+    JS_RemoveWeakPointerZoneGroupCallback(cx, UpdateChildWeakPointersBeforeSweepingZoneGroup);
+    JS_RemoveExtraGCRootsTracer(cx, TraceChild, this);
+}
+
+bool
+JavaScriptChild::init()
+{
+    if (!WrapperOwner::init())
+        return false;
+    if (!WrapperAnswer::init())
+        return false;
+
+    JSContext* cx = dom::danger::GetJSContext();
+    JS_AddWeakPointerZoneGroupCallback(cx, UpdateChildWeakPointersBeforeSweepingZoneGroup, this);
+    JS_AddExtraGCRootsTracer(cx, TraceChild, this);
+    return true;
+}
+
+void
+JavaScriptChild::trace(JSTracer* trc)
+{
+    objects_.trace(trc, strongReferenceObjIdMinimum_);
+}
+
+void
+JavaScriptChild::updateWeakPointers()
+{
+    objects_.sweep();
+    unwaivedObjectIds_.sweep();
+    waivedObjectIds_.sweep();
+}
+
+JSObject*
+JavaScriptChild::scopeForTargetObjects()
+{
+    // CPOWs from the parent need to point into the child's privileged junk
+    // scope so that they can benefit from XrayWrappers in the child.
+    return xpc::PrivilegedJunkScope();
+}
+
+bool
+JavaScriptChild::RecvDropTemporaryStrongReferences(const uint64_t& upToObjId)
+{
+    strongReferenceObjIdMinimum_ = upToObjId + 1;
+    return true;
+}
+
+PJavaScriptChild*
+mozilla::jsipc::NewJavaScriptChild()
+{
+    JavaScriptChild* child = new JavaScriptChild();
+    if (!child->init()) {
+        delete child;
+        return nullptr;
+    }
+    return child;
+}
+
+void
+mozilla::jsipc::ReleaseJavaScriptChild(PJavaScriptChild* child)
+{
+    static_cast<JavaScriptChild*>(child)->decref();
+}