Review Request 120152: Check for null session before using it (see description)

[Sergey Kalinichev]

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>Is it valid for IDefinesAndIncludesManager::manager() to Q_ASSERT that it got a plugin? 

I think yes, it's pretty much valid, as it uses X-KDevelop-LoadMode=AlwaysOn

- Sergey Kalinichev


On Sept. 12, 2014, 9:19 a.m., Olivier Jean de Gaalon wrote:
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> https://git.reviewboard.kde.org/r/120152/
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> (Updated Sept. 12, 2014, 9:19 a.m.)
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> Review request for KDevelop, Aleix Pol Gonzalez, Milian Wolff, and Sergey Kalinichev.
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> Repository: kdevplatform
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> Description
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> Currently TestItemRepositoryRegistryDeferredDeletion is crashing. This is because it creates and deletes the session, then in TestCore::shutdown an event loop is kicked off (just in case!) which loads some plugins (on shutdown!), and checks the active session to see if they are enabled.
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> Question #1: This is one fix, but it's not clear that this is even a valid situation (loading plugins after the session has died). Possibly the test should be fixed instead.
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> With this fix, the crash is deferred to KDevelop, where IDefinesAndIncludesManager::manager() Q_ASSERTS that it got a plugin, and then everywhere IDefinesAndIncludesManager::manager() is used, it's used without checking the pointer.
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> Question #2: Is it valid for IDefinesAndIncludesManager::manager() to Q_ASSERT that it got a plugin? There are a couple ways the plugin could be disabled, which would trigger this assert or just crash later in release mode.
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> After ensuring that the IDefinesAndIncludesManager::manager() pointer is checked, the test completes successfully.
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> Diffs
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>   shell/plugincontroller.cpp 1acb54b 
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> Diff: https://git.reviewboard.kde.org/r/120152/diff/
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> Testing
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> TestItemRepositoryRegistryDeferredDeletion
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> Thanks,
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> Olivier Jean de Gaalon
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