RFR: 8236736: Change notproduct JVM flags to develop flags [v4]

[Ioi Lam]

On Tue, 2 Apr 2024 20:18:34 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> > Thanks for reviewing, Kim. Is your suggestion to not have a JVMFlag object for develop flags in PRODUCT builds? Presumably to save some footprint? I'm not sure we would win fighting the macros to accomplish this.
> 
> Yes, that's the suggestion and the rationale for it. It should also remove the need for is_constant_in_binary. I don't know how hard it would actually be to accomplish this. I agree it might not be worth the effort, but we won't know until someone looks, which I haven't done. It might even be easy.

Currently the VM prints an error message for non-product flags, so we need to keep some information about them. We can probably skip the type information, etc, to save a little space, but the space saving would be minimal.


$ java -XX:+LoomDeoptAfterThaw --version
Error: VM option 'LoomDeoptAfterThaw' is develop and is available only in debug version of VM.
Improperly specified VM option 'LoomDeoptAfterThaw'
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

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PR Comment: https://git.openjdk.org/jdk/pull/18541#issuecomment-2033183718