23037 2008-12-30 11:28:16 -0800 Parsing and reparsing disagree on automatic semicolon insertion 2009-01-11 01:46:18 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED InRadar P2 Normal --- 1 zwarich zwarich pknight sam oldest_to_newest 103812 0 zwarich 2008-12-30 11:28:16 -0800 Parsing and reparsing disagree about automatic semicolon insertion, so that a function like function() { a = 1, } is parsed as being syntactically valid but gets a syntax error upon reparsing. This leads to an assertion failure in Parser::reparse(). It is not that big of an issue in practice, because in a release build such a function will return 'undefined' when called. Other browsers would throw a syntax error, and there aren't many people who write incorrect JS like this and only check their sites with WebKit. In this case, we are not following the spec and it should be a syntax error. However, unless there is a newline separating the ',' and the '}', JavaScriptCore would never treat it as a syntax error in the past either. It will be a bit of work to make our automatic semicolon insertion match the spec, so I am just going to match our past behaviour. 103813 1 zwarich 2008-12-30 11:29:10 -0800 <rdar://problem/6467124> 103814 2 26314 zwarich 2008-12-30 11:35:42 -0800 Created attachment 26314 Proposed patch 103818 3 26314 darin 2008-12-30 12:10:01 -0800 Comment on attachment 26314 Proposed patch I don't think that "during reparsing" is a good name for a boolean. I think that "is reparsing" would be better, or possibly "is reparsing underway". I don't see any code setting m_duringReparsing back to false. How can subsequent parsing possibly work properly? 103823 4 sam 2008-12-30 13:01:48 -0800 It is reset in Lexer::clear() 103839 5 zwarich 2008-12-30 15:36:19 -0800 (In reply to comment #3) > (From update of attachment 26314 [review]) > I don't think that "during reparsing" is a good name for a boolean. I think > that "is reparsing" would be better, or possibly "is reparsing underway". I had it like that originally, and it seemed awkward. I'll change it back. > I don't see any code setting m_duringReparsing back to false. How can > subsequent parsing possibly work properly? Like Sam said, it is reset during clear(). 103844 6 zwarich 2008-12-30 16:10:35 -0800 Landed in r39521 with Darin's comment. 26314 2008-12-30 11:35:42 -0800 2008-12-30 11:49:54 -0800 Proposed patch reparse.diff text/plain 8240 zwarich SW5kZXg6IEphdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBKYXZhU2NyaXB0 Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDM5NTE5KQorKysgSmF2YVNjcmlwdENvcmUvQ2hhbmdl TG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsNDIgQEAKKzIwMDgtMTItMzAgIENhbWVyb24g WndhcmljaCAgPGN3endhcmljaEB1d2F0ZXJsb28uY2E+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkg Tk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgQnVnIDIzMDM3OiBQYXJzaW5nIGFuZCByZXBhcnNp bmcgZGlzYWdyZWUgb24gYXV0b21hdGljIHNlbWljb2xvbiBpbnNlcnRpb24KKyAgICAgICAgPGh0 dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMzAzNz4KKyAgICAgICAgPHJk YXI6Ly9wcm9ibGVtLzY0NjcxMjQ+CisKKyAgICAgICAgUGFyc2luZyBhbmQgcmVwYXJzaW5nIGRp 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