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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/212442">212442</a></dd>
<dt>Author</dt> <dd>keith_miller@apple.com</dd>
<dt>Date</dt> <dd>2017-02-16 10:07:28 -0800 (Thu, 16 Feb 2017)</dd>
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<h3>Log Message</h3>
<pre>Weak should not use jsCast in its accessors
https://bugs.webkit.org/show_bug.cgi?id=168406
Reviewed by Filip Pizlo.
This can cause assertion failures in WebCore where classes might remove themselves
from a data structure in a weak reference, if that reference is still alive.
* heap/WeakInlines.h:
(JSC::>):
(JSC::Weak<T>::operator):
(JSC::Weak<T>::get):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreheapWeakInlinesh">trunk/Source/JavaScriptCore/heap/WeakInlines.h</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (212441 => 212442)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2017-02-16 18:07:17 UTC (rev 212441)
+++ trunk/Source/JavaScriptCore/ChangeLog 2017-02-16 18:07:28 UTC (rev 212442)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2017-02-15 Keith Miller <keith_miller@apple.com>
+
+ Weak should not use jsCast in its accessors
+ https://bugs.webkit.org/show_bug.cgi?id=168406
+
+ Reviewed by Filip Pizlo.
+
+ This can cause assertion failures in WebCore where classes might remove themselves
+ from a data structure in a weak reference, if that reference is still alive.
+
+ * heap/WeakInlines.h:
+ (JSC::>):
+ (JSC::Weak<T>::operator):
+ (JSC::Weak<T>::get):
+
</ins><span class="cx"> 2017-02-16 Yusuke Suzuki <utatane.tea@gmail.com>
</span><span class="cx">
</span><span class="cx"> Web Inspector: allow import() inside the inspector
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreheapWeakInlinesh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/heap/WeakInlines.h (212441 => 212442)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/heap/WeakInlines.h 2017-02-16 18:07:17 UTC (rev 212441)
+++ trunk/Source/JavaScriptCore/heap/WeakInlines.h 2017-02-16 18:07:28 UTC (rev 212442)
</span><span class="lines">@@ -71,20 +71,23 @@
</span><span class="cx"> template<typename T> inline T* Weak<T>::operator->() const
</span><span class="cx"> {
</span><span class="cx"> ASSERT(m_impl && m_impl->state() == WeakImpl::Live);
</span><del>- return jsCast<T*>(m_impl->jsValue().asCell());
</del><ins>+ // We can't use jsCast here since we could be called in a finalizer.
+ return static_cast<T*>(m_impl->jsValue().asCell());
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> template<typename T> inline T& Weak<T>::operator*() const
</span><span class="cx"> {
</span><span class="cx"> ASSERT(m_impl && m_impl->state() == WeakImpl::Live);
</span><del>- return *jsCast<T*>(m_impl->jsValue().asCell());
</del><ins>+ // We can't use jsCast here since we could be called in a finalizer.
+ return *static_cast<T*>(m_impl->jsValue().asCell());
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> template<typename T> inline T* Weak<T>::get() const
</span><span class="cx"> {
</span><span class="cx"> if (!m_impl || m_impl->state() != WeakImpl::Live)
</span><del>- return 0;
- return jsCast<T*>(m_impl->jsValue().asCell());
</del><ins>+ return nullptr;
+ // We can't use jsCast here since we could be called in a finalizer.
+ return static_cast<T*>(m_impl->jsValue().asCell());
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> template<typename T> inline bool Weak<T>::was(T* other) const
</span></span></pre>
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