RFR 8224789 : Parsing repetition count in regex does not detect numeric overflow

[Roger Riggs]

Hi Ivan,

test/jdk/java/util/regex/RegExTest.java:

4954: The test should print the failing exception information and
4951: a message if the Pattern.compile does not fail to distinguish that 
failure from any others.

I don't think there is a need for so many cases of values > 2^31; there 
is no different code path for all those values.
They are fairly cheap, but redundant.

Otherwise, looks fine.

Thanks, Roger


On 05/25/2019 02:28 AM, Ivan Gerasimov wrote:
> Hello!
>
> When Pattern.compile() parses the repetition count in the expressions 
> like '.{100}', '.{1,2}' or '.{3,}' it fails to detect numeric overflow 
> if the result is still non-negative.
>
> Could you please help review the patch?
>
> BUGURL: https://bugs.openjdk.java.net/browse/JDK-8224789
> WEBREV: http://cr.openjdk.java.net/~igerasim/8224789/00/webrev/
>
> Also, reading a char at line 3274 is done with skip(), so the 
> exception thrown at 3315 displays the position of the error more 
> accurately.
>