1 files changed, 123 insertions, 0 deletions
diff --git a/src/bun.js/bindings/webcore/JSCallbackData.h b/src/bun.js/bindings/webcore/JSCallbackData.h
new file mode 100644
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+++ b/src/bun.js/bindings/webcore/JSCallbackData.h
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2007-2021 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.
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE 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 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.
+ */
+
+#pragma once
+
+#include "JSDOMBinding.h"
+#include "ScriptExecutionContext.h"
+#include <JavaScriptCore/JSObject.h>
+#include <JavaScriptCore/Strong.h>
+#include <JavaScriptCore/StrongInlines.h>
+#include <wtf/Threading.h>
+
+namespace WebCore {
+
+// We have to clean up this data on the context thread because unprotecting a
+// JSObject on the wrong thread without synchronization would corrupt the heap
+// (and synchronization would be slow).
+
+class JSCallbackData {
+    WTF_MAKE_FAST_ALLOCATED;
+
+public:
+    enum class CallbackType { Function,
+        Object,
+        FunctionOrObject };
+
+    WEBCORE_EXPORT static JSC::JSValue invokeCallback(JSC::VM&, JSC::JSObject* callback, JSC::JSValue thisValue, JSC::MarkedArgumentBuffer&, CallbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException);
+
+protected:
+    explicit JSCallbackData() = default;
+
+    ~JSCallbackData()
+    {
+#if !PLATFORM(IOS_FAMILY)
+        ASSERT(m_thread.ptr() == &Thread::current());
+#endif
+    }
+
+private:
+#if ASSERT_ENABLED
+    Ref<Thread> m_thread { Thread::current() };
+#endif
+};
+
+class JSCallbackDataStrong : public JSCallbackData {
+public:
+    JSCallbackDataStrong(JSC::VM& vm, JSC::JSObject* callback, void* = nullptr)
+        : m_callback(vm, callback)
+    {
+    }
+
+    JSC::JSObject* callback() { return m_callback.get(); }
+
+    JSC::JSValue invokeCallback(JSC::VM& vm, JSC::JSValue thisValue, JSC::MarkedArgumentBuffer& args, CallbackType callbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException)
+    {
+        return JSCallbackData::invokeCallback(vm, callback(), thisValue, args, callbackType, functionName, returnedException);
+    }
+
+private:
+    JSC::Strong<JSC::JSObject> m_callback;
+};
+
+class JSCallbackDataWeak : public JSCallbackData {
+public:
+    JSCallbackDataWeak(JSC::VM&, JSC::JSObject* callback, void* owner)
+        : m_callback(callback, &m_weakOwner, owner)
+    {
+    }
+
+    JSC::JSObject* callback() { return m_callback.get(); }
+
+    JSC::JSValue invokeCallback(JSC::VM& vm, JSC::JSValue thisValue, JSC::MarkedArgumentBuffer& args, CallbackType callbackType, JSC::PropertyName functionName, NakedPtr<JSC::Exception>& returnedException)
+    {
+        return JSCallbackData::invokeCallback(vm, callback(), thisValue, args, callbackType, functionName, returnedException);
+    }
+
+    template<typename Visitor> void visitJSFunction(Visitor&);
+
+private:
+    class WeakOwner : public JSC::WeakHandleOwner {
+        bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::AbstractSlotVisitor&, const char**) override;
+    };
+    WeakOwner m_weakOwner;
+    JSC::Weak<JSC::JSObject> m_callback;
+};
+
+class DeleteCallbackDataTask : public EventLoopTask {
+public:
+    template<typename CallbackDataType>
+    explicit DeleteCallbackDataTask(CallbackDataType* data)
+        : EventLoopTask(EventLoopTask::CleanupTask, [data](ScriptExecutionContext&) mutable {
+            delete data;
+        })
+    {
+    }
+};
+
+} // namespace WebCore