Bug 55040 – RegExp constructor returns the argument regexp instead of a new object

• Status: RESOLVED
• Resolution: FIXED
• Component: JavaScriptCore

[Kent Hansen]

In the following script, the last comparison

r = new RegExp;
r2 = new RegExp(r);
r == r2;

should produce false; however, with JSC it produces true. I.e., the "copy-constructing" call to RegExp doesn't return a new object.
In both V8 and SpiderMonkey, a new object is returned, as per ECMA-262 5th edition, section 15.10.4.

[Gavin Barraclough]

Created attachment 98947 [details]
Thepatch

[WebKit Review Bot]

Attachment 98947 [details] did not pass style-queue:

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

Source/JavaScriptCore/runtime/RegExpConstructor.cpp:305:  An else statement can be removed when the prior "if" concludes with a return, break, continue or goto statement.  [readability/control_flow] [4]
Total errors found: 1 in 7 files


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

[Gavin Barraclough]

fixed in r89946