Bug 204437 – [MSVC] error C2039: 'weakPtrFactory': is not a member of 'WebCore::DocumentStorageAccess::requestStorageAccess::<lambda_3f2cfd7704f93d8fe19d5b5f064f8add>'

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Fujii Hironori]

[MSVC] error C2039: 'weakPtrFactory': is not a member of 'WebCore::DocumentStorageAccess::requestStorageAccess::<lambda_3f2cfd7704f93d8fe19d5b5f064f8add>'

WinCairo can't compile since r252723 (Bug 204397).

https://build.webkit.org/builders/WinCairo%2064-bit%20WKL%20Release%20%28Build%29/builds/13581

> FAILED: Source/WebCore/CMakeFiles/WebCore.dir/__/__/WebCore/DerivedSources/unified-sources/UnifiedSource-be65d27a-7.cpp.obj 
> C:\MSVS\VC\Tools\MSVC\14.20.27508\bin\Hostx64\x64\cl.exe  (...) -c WebCore\DerivedSources\unified-sources\UnifiedSource-be65d27a-7.cpp
> C:\WebKit-BuildWorker\wincairo-wkl-release\build\WebKitBuild\Release\WTF\Headers\wtf/WeakPtr.h(252): error C2039: 'weakPtrFactory': is not a member of 'WebCore::DocumentStorageAccess::requestStorageAccess::<lambda_3f2cfd7704f93d8fe19d5b5f064f8add>'
> C:\WebKit-BuildWorker\wincairo-wkl-release\build\Source\WebCore\dom/DocumentStorageAccess.cpp(205): note: see declaration of 'WebCore::DocumentStorageAccess::requestStorageAccess::<lambda_3f2cfd7704f93d8fe19d5b5f064f8add>'
> C:\WebKit-BuildWorker\wincairo-wkl-release\build\Source\WebCore\dom/DocumentStorageAccess.cpp(185): note: see reference to function template instantiation 'WTF::WeakPtr<WebCore::DocumentStorageAccess::requestStorageAccess::<lambda_3f2cfd7704f93d8fe19d5b5f064f8add>> WTF::makeWeakPtr<WebCore::DocumentStorageAccess::requestStorageAccess::<lambda_3f2cfd7704f93d8fe19d5b5f064f8add>>(T &)' being compiled
>         with
>         [
>             T=WebCore::DocumentStorageAccess::requestStorageAccess::<lambda_3f2cfd7704f93d8fe19d5b5f064f8add>
>         ]

[Fujii Hironori]

This is a similar issue with r251999.

[Fujii Hironori]

Created attachment 384020 [details]
Patch

[Fujii Hironori]

Comment on attachment 384020 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=384020&action=review

> Source/WebCore/ChangeLog:11
> +        the inner lambda.

It seems that the outer lambda is executed in the main thread. It's safe to dereference the weak ptr in the outer lambda. I don't need to create two weak ptrs. Will fix.

[Fujii Hironori]

Created attachment 384023 [details]
WIP patch

[Fujii Hironori]

[MSConnect 3128879] C++: 'this' in capture expression of nested lambda resolves to the enclosing closure rather than the enclosing class instance - Developer Community
https://developercommunity.visualstudio.com/content/problem/30060/c-this-in-capture-expression-of-nested-lambda-reso.html

This captured in nested lambda when used in capture list results in this being an instance of lambda but not of the surrounding class - Developer Community
https://developercommunity.visualstudio.com/content/problem/292128/this-captured-in-nested-lambda-when-used-in-captur.html

[Fujii Hironori]

https://developercommunity.visualstudio.com/solutions/809339/view.html

> Please try to use /std:c++latest instead of /std:c++17 as it’s about new lambda processor. It also works with /experimental:newLambdaProcessor.

[Fujii Hironori]

Created attachment 384024 [details]
Patch for landing

[Fujii Hironori]

Committed r252726: <https://trac.webkit.org/changeset/252726>

[Radar WebKit Bug Importer]

<rdar://problem/57383131>

[Ryosuke Niwa]

Oh, thanks for the fix.

[Fujii Hironori]

  Bug 187035 – [Win] 'deref': is not a member of 'WebKit::WebResourceLoadStatisticsStore::updateCookiePartitioningForDomains::<lambda_9d761a6dc12d95db7fa2d6f3f5aa26fa>'
  Bug 184120 – [Win] MSVC can't compile WebResourceLoadStatisticsStore::scheduleClearInMemoryAndPersistent

These were also same.