[Webkit-unassigned] [Bug 239338] New: -Wuse-after-free wraning when building RefCounter test with GCC 12

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239338

            Bug ID: 239338
           Summary: -Wuse-after-free wraning when building RefCounter test
                    with GCC 12
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at gnome.org

TODO: I should investigate this more closely

[1736/6690] Building CXX object Tools/TestWebKitAPI/CMakeFiles/TestWTF.dir/Tests/WTF/RefCounter.cpp.o
In file included from /home/mcatanzaro/Projects/WebKit/Tools/TestWebKitAPI/Tests/WTF/RefCounter.cpp:29:
In member function ‘void WTF::RefCounter<T>::Count::deref() [with T = TestWebKitAPI::TestCounterType]’,
    inlined from ‘static void WTF::DefaultRefDerefTraits< <template-parameter-1-1> >::derefIfNotNull(T*) [with T = WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefPtr.h:42:23,
    inlined from ‘WTF::RefPtr<T, PtrTraits, RefDerefTraits>& WTF::RefPtr<T, <template-parameter-1-2>, <template-parameter-1-3> >::operator=(std::nullptr_t) [with T = WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count; _PtrTraits = WTF::RawPtrTraits<WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count>; _RefDerefTraits = WTF::DefaultRefDerefTraits<WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count>]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefPtr.h:160:22,
    inlined from ‘virtual void TestWebKitAPI::WTF_RefCounter_Test::TestBody()’ at /home/mcatanzaro/Projects/WebKit/Tools/TestWebKitAPI/Tests/WTF/RefCounter.cpp:152:19:
/home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefCounter.h:101:9: warning: pointer used after ‘void operator delete(void*, std::size_t)’ [-Wuse-after-free]
  101 |     if (m_refCounter && m_refCounter->m_valueDidChange) {
      |         ^~~~~~~~~~~~
In member function ‘void WTF::RefCounter<T>::Count::refCounterWasDeleted() [with T = TestWebKitAPI::TestCounterType]’,
    inlined from ‘void WTF::RefCounter<T>::Count::deref() [with T = TestWebKitAPI::TestCounterType]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefCounter.h:115:13,
    inlined from ‘static void WTF::DefaultRefDerefTraits< <template-parameter-1-1> >::derefIfNotNull(T*) [with T = WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefPtr.h:42:23,
    inlined from ‘WTF::RefPtr<T, PtrTraits, RefDerefTraits>& WTF::RefPtr<T, <template-parameter-1-2>, <template-parameter-1-3> >::operator=(std::nullptr_t) [with T = WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count; _PtrTraits = WTF::RawPtrTraits<WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count>; _RefDerefTraits = WTF::DefaultRefDerefTraits<WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count>]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefPtr.h:160:22,
    inlined from ‘virtual void TestWebKitAPI::WTF_RefCounter_Test::TestBody()’ at /home/mcatanzaro/Projects/WebKit/Tools/TestWebKitAPI/Tests/WTF/RefCounter.cpp:150:19:
/home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefCounter.h:128:9: note: call to ‘void operator delete(void*, std::size_t)’ here
  128 |         delete this;
      |         ^~~~~~~~~~~
In member function ‘void WTF::RefCounter<T>::Count::deref() [with T = TestWebKitAPI::TestCounterType]’,
    inlined from ‘static void WTF::DefaultRefDerefTraits< <template-parameter-1-1> >::derefIfNotNull(T*) [with T = WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefPtr.h:42:23,
    inlined from ‘WTF::RefPtr<T, PtrTraits, RefDerefTraits>& WTF::RefPtr<T, <template-parameter-1-2>, <template-parameter-1-3> >::operator=(std::nullptr_t) [with T = WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count; _PtrTraits = WTF::RawPtrTraits<WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count>; _RefDerefTraits = WTF::DefaultRefDerefTraits<WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count>]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefPtr.h:160:22,
    inlined from ‘virtual void TestWebKitAPI::WTF_RefCounter_Test::TestBody()’ at /home/mcatanzaro/Projects/WebKit/Tools/TestWebKitAPI/Tests/WTF/RefCounter.cpp:152:19:
/home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefCounter.h:99:7: warning: pointer used after ‘void operator delete(void*, std::size_t)’ [-Wuse-after-free]
   99 |     --m_value;
      |       ^~~~~~~
In member function ‘void WTF::RefCounter<T>::Count::refCounterWasDeleted() [with T = TestWebKitAPI::TestCounterType]’,
    inlined from ‘void WTF::RefCounter<T>::Count::deref() [with T = TestWebKitAPI::TestCounterType]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefCounter.h:115:13,
    inlined from ‘static void WTF::DefaultRefDerefTraits< <template-parameter-1-1> >::derefIfNotNull(T*) [with T = WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefPtr.h:42:23,
    inlined from ‘WTF::RefPtr<T, PtrTraits, RefDerefTraits>& WTF::RefPtr<T, <template-parameter-1-2>, <template-parameter-1-3> >::operator=(std::nullptr_t) [with T = WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count; _PtrTraits = WTF::RawPtrTraits<WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count>; _RefDerefTraits = WTF::DefaultRefDerefTraits<WTF::RefCounter<TestWebKitAPI::TestCounterType>::Count>]’ at /home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefPtr.h:160:22,
    inlined from ‘virtual void TestWebKitAPI::WTF_RefCounter_Test::TestBody()’ at /home/mcatanzaro/Projects/WebKit/Tools/TestWebKitAPI/Tests/WTF/RefCounter.cpp:150:19:
/home/mcatanzaro/Projects/WebKit/WebKitBuild/GNOME-gtk3/WTF/Headers/wtf/RefCounter.h:128:9: note: call to ‘void operator delete(void*, std::size_t)’ here
  128 |         delete this;
      |         ^~~~~~~~~~~

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