RFR: 8299807: newStringUTF8NoRepl and getBytesUTF8NoRepl always copy arrays

[Sergey Tsypanov]

On Mon, 9 Jan 2023 03:34:55 GMT, Glavo <duke at openjdk.org> wrote:

> `JavaLangAccess::newStringUTF8NoRepl` and `JavaLangAccess::getBytesUTF8NoRepl` are not implemented correctly. They always copy arrays, rather than avoiding copying as much as possible as javadoc says.
> 
> I ran the tier1 test without any new errors.

src/java.base/share/classes/java/lang/String.java line 927:

> 925:         byte[] val = s.value();
> 926:         byte coder = s.coder();
> 927:         if (coder == LATIN1 && isASCII(val)) {

Why don't we just call `s.isLatin1()` instead of `coder == LATIN1 && isASCII(val)`?

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PR: https://git.openjdk.org/jdk/pull/11897