Bug 214835 – Update release*() functions on ExceptionOr() to always release the member

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Chris Dumez]

Update release*() functions on ExceptionOr() to always release the member, instead of simply doing a cast and leaving it up to the call site.

[Darin Adler]

In addition to this good change, I still think we might *also* want to add an assertion to make sure we never double-release.

[Chris Dumez]

(In reply to Darin Adler from comment #1)
> In addition to this good change, I still think we might *also* want to add
> an assertion to make sure we never double-release.

Working on it. I ran the tests and it actually found a bug :S

[Chris Dumez]

Created attachment 405302 [details]
Patch

[Darin Adler]

Comment on attachment 405302 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=405302&action=review

> Source/WebCore/dom/ExceptionOr.h:140
> +    ASSERT(!m_wasReleased);
> +#if ASSERT_ENABLED
> +    m_wasReleased = true;
> +#endif

I have a horrible/great idea:

    ASSERT(!std::exchnage(m_wasReleased, true));

[Chris Dumez]

(In reply to Darin Adler from comment #4)
> Comment on attachment 405302 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=405302&action=review
> 
> > Source/WebCore/dom/ExceptionOr.h:140
> > +    ASSERT(!m_wasReleased);
> > +#if ASSERT_ENABLED
> > +    m_wasReleased = true;
> > +#endif
> 
> I have a horrible/great idea:
> 
>     ASSERT(!std::exchnage(m_wasReleased, true));

Not super readable but this is way more concise and avoid the #if. I'll do it.

[Chris Dumez]

Created attachment 405305 [details]
Patch

[Darin Adler]

(In reply to Chris Dumez from comment #5)
> Not super readable but this is way more concise and avoid the #if. I'll do
> it.

Glad you decided to use it. I guessed that you would see both the horrible side and the great side.

[Chris Dumez]

Bots are not happy. Looks like this may have found another bug in IDB.

[Chris Dumez]

(In reply to Chris Dumez from comment #8)
> Bots are not happy. Looks like this may have found another bug in IDB.

Or maybe not. I see the same IDB failures on another patch.. Tree is likely red.

[Chris Dumez]

Created attachment 405313 [details]
Patch

[EWS]

Committed r264958: <https://trac.webkit.org/changeset/264958>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 405313 [details].

[Radar WebKit Bug Importer]

<rdar://problem/66189892>