Bug 117967 – fourthTier: DFG should support switch_string

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Filip Pizlo]

Patch forthcoming.

[Filip Pizlo]

Created attachment 205353 [details]
work in progress

[Filip Pizlo]

*** Bug 117861 has been marked as a duplicate of this bug. ***

[Filip Pizlo]

Created attachment 205356 [details]
work in progress

[Filip Pizlo]

Created attachment 205421 [details]
the patch

[Filip Pizlo]

Comment on attachment 205421 [details]
the patch

View in context: https://bugs.webkit.org/attachment.cgi?id=205421&action=review

> Source/JavaScriptCore/dfg/DFGSpeculativeJIT.cpp:4969
> +        // == commonChars. Hence we know that it now must be >= minLength, i.e., that

Should say: "Hence we know that it now must be > minLength, ..."

[Sam Weinig]

Comment on attachment 205421 [details]
the patch

View in context: https://bugs.webkit.org/attachment.cgi?id=205421&action=review

> Source/JavaScriptCore/dfg/DFGBinarySwitch.h:46
> +// Use this like so:
> +//
> +// BinarySwitch switch(valueReg, casesVector, BinarySwitch::Int32);
> +// while (switch.advance(jit)) {
> +//     int value = switch.caseValue();
> +//     unsigned index = switch.caseIndex(); // index into casesVector, above
> +//     ... // generate code for this case
> +// }
> +// switch.fallThrough().link(&jit);

I think this could use a description of what a BinarySwitch is going to be used for.

[Filip Pizlo]

(In reply to comment #6)
> (From update of attachment 205421 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=205421&action=review
> 
> > Source/JavaScriptCore/dfg/DFGBinarySwitch.h:46
> > +// Use this like so:
> > +//
> > +// BinarySwitch switch(valueReg, casesVector, BinarySwitch::Int32);
> > +// while (switch.advance(jit)) {
> > +//     int value = switch.caseValue();
> > +//     unsigned index = switch.caseIndex(); // index into casesVector, above
> > +//     ... // generate code for this case
> > +// }
> > +// switch.fallThrough().link(&jit);
> 
> I think this could use a description of what a BinarySwitch is going to be used for.

Will do!

[Filip Pizlo]

Created attachment 205445 [details]
patch for landing

[Filip Pizlo]

Landed in http://trac.webkit.org/changeset/151979