Bug 187292 – FunctionTraits: Make cCallArity() constant on 32-bits.

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Guillaume Emont]

On X86, in CCallHelpers.h we have a static_assert that uses cCallArity(), so it needs to be constant to avoid a compilation error.

[Guillaume Emont]

Created attachment 344189 [details]
Patch

Patch fixing the issue using std::enable_if_t function parameters instead of a runtime if.

[Guillaume Emont]

Created attachment 344194 [details]
Patch

New version with a message on static_assert to make clang happy.

[EWS Watchlist]

Comment on attachment 344194 [details]
Patch

Attachment 344194 [details] did not pass win-ews (win):
Output: https://webkit-queues.webkit.org/results/8426224

New failing tests:
http/tests/security/canvas-remote-read-remote-video-blocked-no-crossorigin.html

[EWS Watchlist]

Created attachment 344203 [details]
Archive of layout-test-results from ews205 for win-future

The attached test failures were seen while running run-webkit-tests on the win-ews.
Bot: ews205  Port: win-future  Platform: CYGWIN_NT-6.1-2.9.0-0.318-5-3-x86_64-64bit

[EWS Watchlist]

Comment on attachment 344194 [details]
Patch

Attachment 344194 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: https://webkit-queues.webkit.org/results/8425977

New failing tests:
animations/needs-layout.html

[EWS Watchlist]

Created attachment 344204 [details]
Archive of layout-test-results from ews122 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews122  Port: ios-simulator-wk2  Platform: Mac OS X 10.13.4

[Guillaume Emont]

EWS failures look like they are unrelated to the change.

[Yusuke Suzuki]

Comment on attachment 344194 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=344194&action=review

> Source/WTF/wtf/FunctionTraits.h:-45
> -    ASSERT(sizeof(T) <= 4);

I think just changing this to `static_assert(sizeof(T) == 8 || sizeof(T) <= 4, "")` is enough since we have relaxed constexpr.

[Guillaume Emont]

(In reply to Yusuke Suzuki from comment #8)
> Comment on attachment 344194 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=344194&action=review
> 
> > Source/WTF/wtf/FunctionTraits.h:-45
> > -    ASSERT(sizeof(T) <= 4);
> 
> I think just changing this to `static_assert(sizeof(T) == 8 || sizeof(T) <=
> 4, "")` is enough since we have relaxed constexpr.

Indeed it is much simpler. I am sorry I did not know about relaxed constexpr. New patch upcoming.

[Guillaume Emont]

Created attachment 344281 [details]
Patch

New simpler version taking advantage of relaxed constexpr.

[Yusuke Suzuki]

Comment on attachment 344281 [details]
Patch

r=me

[WebKit Commit Bot]

Comment on attachment 344281 [details]
Patch

Clearing flags on attachment: 344281

Committed r233504: <https://trac.webkit.org/changeset/233504>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/41817774>