From c5d637fbb15874caa0d9669ac8cc79912ed4d5d9 Mon Sep 17 00:00:00 2001
From: Jarred Sumner <jarred@jarredsumner.com>
Date: Sat, 9 Apr 2022 19:53:17 -0700
Subject: WIP

---
 .../jsc/bindings/webcore/JSDOMGuardedObject.cpp    | 78 ++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 src/javascript/jsc/bindings/webcore/JSDOMGuardedObject.cpp

(limited to 'src/javascript/jsc/bindings/webcore/JSDOMGuardedObject.cpp')

diff --git a/src/javascript/jsc/bindings/webcore/JSDOMGuardedObject.cpp b/src/javascript/jsc/bindings/webcore/JSDOMGuardedObject.cpp
new file mode 100644
index 000000000..76fc86415
--- /dev/null
+++ b/src/javascript/jsc/bindings/webcore/JSDOMGuardedObject.cpp
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2017-2021 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "JSDOMGuardedObject.h"
+
+
+namespace WebCore {
+using namespace JSC;
+
+DOMGuardedObject::DOMGuardedObject(JSDOMGlobalObject& globalObject, JSCell& guarded)
+    : ActiveDOMCallback(globalObject.scriptExecutionContext())
+    , m_guarded(&guarded)
+    , m_globalObject(&globalObject)
+{
+    globalObject.vm().writeBarrier(&globalObject, &guarded);
+    if (globalObject.vm().heap.mutatorShouldBeFenced()) {
+        Locker locker { globalObject.gcLock() };
+        globalObject.guardedObjects().add(this);
+        return;
+    }
+    globalObject.guardedObjects(NoLockingNecessary).add(this);
+}
+
+DOMGuardedObject::~DOMGuardedObject()
+{
+    clear();
+}
+
+void DOMGuardedObject::clear()
+{
+    ASSERT(!m_guarded || m_globalObject);
+    removeFromGlobalObject();
+    m_guarded.clear();
+    m_globalObject.clear();
+}
+
+void DOMGuardedObject::removeFromGlobalObject()
+{
+    if (!m_guarded || !m_globalObject)
+        return;
+
+    if (m_globalObject->vm().heap.mutatorShouldBeFenced()) {
+        Locker locker { m_globalObject->gcLock() };
+        m_globalObject->guardedObjects().remove(this);
+    } else
+        m_globalObject->guardedObjects(NoLockingNecessary).remove(this);
+}
+
+void DOMGuardedObject::contextDestroyed()
+{
+    ActiveDOMCallback::contextDestroyed();
+    clear();
+}
+
+}
-- 
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