Bug 24096 – Use PLATFORM(CF) instead of PLATFORM(MAC) in CurrentTime.cpp

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Jeremy Moskovich]

This change allows Chrome on OS X to use the CF functions for currentTime() rather than the POSIX variant.

[Jeremy Moskovich]

Created attachment 27882 [details]
PLATFORM(CF)

Is PLATFORM(CF) OK to use here?  A concern has been raised about Apple's CF variant on Windows, if this is a problem, would PLATFORM(DARWIN) && PLATFORM(CF) be a better choice?

[Adam Roben (:aroben)]

(In reply to comment #1)
> Is PLATFORM(CF) OK to use here?  A concern has been raised about Apple's CF
> variant on Windows, if this is a problem, would PLATFORM(DARWIN) &&
> PLATFORM(CF) be a better choice?

We still want Windows to use the WIN_OS code, as it is higher-resolution than CFAbsoluteTimeGetCurrent on Windows. One option would be to do what you proposed: PLATFORM(DARWIN) && PLATFORM(CF). Another option would be to make the WIN_OS code the first branch of the #if/#elif chain. I think I prefer the latter.

[Jeremy Moskovich]

Created attachment 27883 [details]
Address aroben's comments from previous patch

Thanks, I've put the Windows case first and added a comment so the reasoning behind the change isn't lost.

[Adam Roben (:aroben)]

Comment on attachment 27883 [details]
Address aroben's comments from previous patch

> +#elif PLATFORM(GTK)
> +
> +// Note: GTK on Windows will pick up the PLATFORM(WIN) implementation above which provides
> +// better accuracy compared with Windows implementation of g_get_current_time:
> +// (http://www.google.com/codesearch/p?hl=en#HHnNRjks1t0/glib-2.5.2/glib/gmain.c&q=g_get_current_time).
> +// Non-Windows GTK builds could use gettimeofday() directly but for the sake of consistency lets use GTK function.

Looks like this patch helps out GTK/win, too!

r=me

[Dimitri Glazkov (Google)]

Landed as http://trac.webkit.org/changeset/41149.