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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/dom/MutationObserver.h"
#include "core/dom/MutationCallback.h"
#include "core/dom/MutationObserverInit.h"
#include "core/dom/MutationObserverRegistration.h"
#include "core/html/HTMLDocument.h"
#include "core/html/HTMLElement.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace blink {
namespace {
class EmptyMutationCallback : public MutationCallback {
public:
explicit EmptyMutationCallback(Document& document) : m_document(document) {}
DEFINE_INLINE_VIRTUAL_TRACE() {
visitor->trace(m_document);
MutationCallback::trace(visitor);
}
private:
void call(const HeapVector<Member<MutationRecord>>&,
MutationObserver*) override {}
ExecutionContext* getExecutionContext() const override { return m_document; }
Member<Document> m_document;
};
}
TEST(MutationObserverTest, DisconnectCrash) {
Persistent<Document> document = HTMLDocument::create();
HTMLElement* root = toHTMLElement(document->createElement("html"));
document->appendChild(root);
root->setInnerHTML("<head><title>\n</title></head><body></body>");
Node* head = root->firstChild()->firstChild();
DCHECK(head);
Persistent<MutationObserver> observer =
MutationObserver::create(new EmptyMutationCallback(*document));
MutationObserverInit init;
init.setCharacterDataOldValue(false);
observer->observe(head, init, ASSERT_NO_EXCEPTION);
head->remove();
Persistent<MutationObserverRegistration> registration =
observer->m_registrations.begin()->get();
// The following GC will collect |head|, but won't collect a
// MutationObserverRegistration for |head|.
ThreadState::current()->collectGarbage(BlinkGC::NoHeapPointersOnStack,
BlinkGC::GCWithoutSweep,
BlinkGC::ForcedGC);
observer->disconnect();
// The test passes if disconnect() didn't crash. crbug.com/657613.
}
} // namespace blink
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