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-rw-r--r--mfbt/tests/TestThreadSafeWeakPtr.cpp127
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diff --git a/mfbt/tests/TestThreadSafeWeakPtr.cpp b/mfbt/tests/TestThreadSafeWeakPtr.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 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 "mozilla/RefPtr.h"
+#include "mozilla/ThreadSafeWeakPtr.h"
+
+using mozilla::SupportsThreadSafeWeakPtr;
+using mozilla::ThreadSafeWeakPtr;
+
+// To have a class C support weak pointers, inherit from
+// SupportsThreadSafeWeakPtr<C>.
+class C : public SupportsThreadSafeWeakPtr<C> {
+ public:
+ MOZ_DECLARE_REFCOUNTED_TYPENAME(C)
+
+ int mNum;
+
+ C() : mNum(0) {}
+
+ ~C() {
+ // Setting mNum in the destructor allows us to test against use-after-free
+ // below
+ mNum = 0xDEAD;
+ }
+
+ void act() {}
+};
+
+// Test that declaring a ThreadSafeWeakPtr pointing to an incomplete type
+// builds.
+class Incomplete;
+class D {
+ ThreadSafeWeakPtr<Incomplete> mMember;
+};
+
+int main() {
+ RefPtr<C> c1 = new C;
+ MOZ_RELEASE_ASSERT(c1->mNum == 0);
+
+ // Get weak pointers to c1. The first time,
+ // a reference-counted ThreadSafeWeakReference object is created that
+ // can live beyond the lifetime of 'c1'. The ThreadSafeWeakReference
+ // object will be notified of 'c1's destruction.
+ ThreadSafeWeakPtr<C> w1(c1);
+ {
+ RefPtr<C> s1(w1);
+ // Test a weak pointer for validity before using it.
+ MOZ_RELEASE_ASSERT(s1);
+ MOZ_RELEASE_ASSERT(s1 == c1);
+ s1->mNum = 1;
+ s1->act();
+ }
+
+ // Test taking another ThreadSafeWeakPtr<C> to c1
+ ThreadSafeWeakPtr<C> w2(c1);
+ {
+ RefPtr<C> s2(w2);
+ MOZ_RELEASE_ASSERT(s2);
+ MOZ_RELEASE_ASSERT(s2 == c1);
+ MOZ_RELEASE_ASSERT(w1 == s2);
+ MOZ_RELEASE_ASSERT(s2->mNum == 1);
+ }
+
+ // Test that when a ThreadSafeWeakPtr is destroyed, it does not destroy the
+ // object that it points to, and it does not affect other ThreadSafeWeakPtrs
+ // pointing to the same object (e.g. it does not destroy the
+ // ThreadSafeWeakReference object).
+ {
+ ThreadSafeWeakPtr<C> w4local(c1);
+ MOZ_RELEASE_ASSERT(w4local == c1);
+ }
+ // Now w4local has gone out of scope. If that had destroyed c1, then the
+ // following would fail for sure (see C::~C()).
+ MOZ_RELEASE_ASSERT(c1->mNum == 1);
+ // Check that w4local going out of scope hasn't affected other
+ // ThreadSafeWeakPtr's pointing to c1
+ MOZ_RELEASE_ASSERT(w1 == c1);
+ MOZ_RELEASE_ASSERT(w2 == c1);
+
+ // Now construct another C object and test changing what object a
+ // ThreadSafeWeakPtr points to
+ RefPtr<C> c2 = new C;
+ c2->mNum = 2;
+ {
+ RefPtr<C> s2(w2);
+ MOZ_RELEASE_ASSERT(s2->mNum == 1); // w2 was pointing to c1
+ }
+ w2 = c2;
+ {
+ RefPtr<C> s2(w2);
+ MOZ_RELEASE_ASSERT(s2);
+ MOZ_RELEASE_ASSERT(s2 == c2);
+ MOZ_RELEASE_ASSERT(s2 != c1);
+ MOZ_RELEASE_ASSERT(w1 != s2);
+ MOZ_RELEASE_ASSERT(s2->mNum == 2);
+ }
+
+ // Destroying the underlying object clears weak pointers to it.
+ // It should not affect pointers that are not currently pointing to it.
+ c1 = nullptr;
+ {
+ RefPtr<C> s1(w1);
+ MOZ_RELEASE_ASSERT(
+ !s1, "Deleting an object should clear ThreadSafeWeakPtr's to it.");
+ MOZ_RELEASE_ASSERT(w1.IsDead(), "The weak pointer is now dead");
+ MOZ_RELEASE_ASSERT(!w1.IsNull(), "The weak pointer isn't null");
+
+ RefPtr<C> s2(w2);
+ MOZ_RELEASE_ASSERT(s2,
+ "Deleting an object should not clear ThreadSafeWeakPtr "
+ "that are not pointing to it.");
+ MOZ_RELEASE_ASSERT(!w2.IsDead(), "The weak pointer isn't dead");
+ MOZ_RELEASE_ASSERT(!w2.IsNull(), "The weak pointer isn't null");
+ }
+
+ c2 = nullptr;
+ {
+ RefPtr<C> s2(w2);
+ MOZ_RELEASE_ASSERT(
+ !s2, "Deleting an object should clear ThreadSafeWeakPtr's to it.");
+ MOZ_RELEASE_ASSERT(w2.IsDead(), "The weak pointer is now dead");
+ MOZ_RELEASE_ASSERT(!w2.IsNull(), "The weak pointer isn't null");
+ }
+}