String replace with the empty string means string removal

[Gavin Barraclough]

Optimization for String.prototype.replace([RegExp], ""), this improves v8-regexp by ~3%.

[Gavin Barraclough]

Created attachment 103133 [details]
The patch

[WebKit Review Bot]

Attachment 103133 [details] did not pass style-queue:

Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/JavaScriptCore/ChangeLog', u'Source..." exit_code: 1

Source/JavaScriptCore/runtime/StringPrototype.cpp:267:  Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons.  [readability/comparison_to_zero] [5]
Source/JavaScriptCore/runtime/StringPrototype.cpp:271:  Local variables should never be PassRefPtr (see http://webkit.org/coding/RefPtr.html).  [readability/pass_ptr] [5]
Source/JavaScriptCore/runtime/StringPrototype.cpp:380:  Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons.  [readability/comparison_to_zero] [5]
Total errors found: 3 in 2 files


If any of these errors are false positives, please file a bug against check-webkit-style.

[Sam Weinig]

Comment on attachment 103133 [details]
The patch

View in context: https://bugs.webkit.org/attachment.cgi?id=103133&action=review

>> Source/JavaScriptCore/runtime/StringPrototype.cpp:271
>> +    PassRefPtr<StringImpl> impl = StringImpl::tryCreateUninitialized(totalLength, buffer);
> 
> Local variables should never be PassRefPtr (see http://webkit.org/coding/RefPtr.html).  [readability/pass_ptr] [5]

This is copy and pasted, but very wrong.  Please us a RefPtr and fix the other spot.

[Gavin Barraclough]

Fixed in r92540