Bug 25275 – use AtomicString to speed up window and document interceptors

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Antony Sargent]

Patch forthcoming.

[Antony Sargent]

Created attachment 29590 [details]
patch v1

[Dimitri Glazkov (Google)]

Comment on attachment 29590 [details]
patch v1

Looks good.

> +        http://codereview.chromium.org/67141

Don't need Chromium review in ChangeLog, probably. Just mention it on bug.

[Eric Seidel (no email)]

Comment on attachment 29590 [details]
patch v1

WebKit uses DEFINE_STATIC_LOCAL for local statics.  The Mac build will have trouble if we don't here too.

// Use these to declare and define a static local variable (static T;) so that
//  it is leaked so that its destructors are not called at exit. Using this
//  macro also allows workarounds a compiler bug present in Apple's version of GCC 4.0.1.
#if COMPILER(GCC) && defined(__APPLE_CC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 0 && __GNUC_PATCHLEVEL__ == 1
#define DEFINE_STATIC_LOCAL(type, name, arguments) \
    static type* name##Ptr = new type arguments; \
    type& name = *name##Ptr
#else
#define DEFINE_STATIC_LOCAL(type, name, arguments) \
    static type& name = *new type arguments
#endif

[Eric Seidel (no email)]

cc-ing Dimitri so he can see my comments.

[Antony Sargent]

Created attachment 29896 [details]
patch v2

Switched to using DEFINE_STATIC_LOCAL. Thanks for catching this Eric!

[Eric Seidel (no email)]

Comment on attachment 29896 [details]
patch v2

Looks fine.  Will land.

[Eric Seidel (no email)]

Do we have any performance tests which show that this is actually faster?

I'm going to land it as-is... but it seems this sort of change should have some perf-data associated with it.

[Eric Seidel (no email)]

Committing to http://svn.webkit.org/repository/webkit/trunk ...
	M	WebCore/ChangeLog
	M	WebCore/bindings/v8/custom/V8DOMWindowCustom.cpp
	M	WebCore/bindings/v8/custom/V8HTMLDocumentCustom.cpp
Committed r43022

[Dimitri Glazkov (Google)]

Whoops. Last patch actually introduced variable redefinition. Fixing...

[Dimitri Glazkov (Google)]

Fix landed in http://trac.webkit.org/changeset/43066.