RFR: 8301119: Support for GB18030-2022

[Sean Coffey]

On Fri, 10 Feb 2023 20:35:58 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> Upgrading the GB18030 charset in the JDK to the latest 2022 standard. Since this is not a compatible upgrade to the existing mapping, a new system property `jdk.charset.GB18030` is introduced. If it is set to "2000", the mapping falls back to the existing mapping based on the 2000 standard, otherwise, it defaults to 2022 mapping. Refer to the corresponding CSR for more detail.

src/java.base/share/classes/sun/nio/cs/StandardCharsets.java.template line 217:

> 215:             if (VM.initLevel() < 1) {
> 216:                 // Cannot get the system property yet. Assumes non-2000
> 217:                 GB18030_2000 = "";

curious - what scenario triggers this call at initLevel < 1 ? would it be better to simply return "false" at that time and leave the GB18030_2000 variable to be set once we're at initLevel >=1  ?  -- or perhaps that would invalidate the workflow of the original caller (which called in at initLevel <1)

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PR: https://git.openjdk.org/jdk/pull/12518