RFR: 8325002: Exceptions::fthrow needs to ensure it truncates to a valid utf8 string

[David Holmes]

On Fri, 26 Jul 2024 21:42:32 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> src/hotspot/share/utilities/utf8.cpp line 440:
>> 
>>> 438:         // Could be first or fourth byte. If fourth
>>> 439:         // then 2 bytes before will have second byte pattern (0b1010xxxx)
>>> 440:         if ((index - 3) >= 0 && ((buffer[index - 2] & 0xA0) == 0xA0)) {
>> 
>> Suggestion:
>> 
>>         if ((index - 3) >= 0 && ((buffer[index - 2] & 0xF0) == 0xA0)) {
>
> I don't understand the rationale for the suggestion sorry.

I am looking specifically for the second byte of six pattern.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20345#discussion_r1693630123