RFR: 8329706: Implement -XX:+AOTClassLinking [v4]

[Ioi Lam]

On Thu, 12 Sep 2024 14:04:40 GMT, Ashutosh Mehra <asmehra at openjdk.org> wrote:

>> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   @adinn comments
>
> test/hotspot/jtreg/runtime/cds/appcds/jvmti/ClassFileLoadHookTest.java line 110:
> 
>> 108:                 "" + ClassFileLoadHook.TestCaseId.SHARING_ON_CFLH_ON);
>> 109:         if (out.contains("Using AOT-linked classes: false")) {
>> 110:             // We are running with VM options that do not support -XX:+AOTClassLinking
> 
> When will we run into this case? Is there a VM option that would silently disable AOTClassLinking in prod run?

AOTClassLinking requires the ability to write the full archived module graph (FMG), so it will be disabled if jtreg is executed with
- a GC that doesn't support object heap writing, such as ZGC
- a module related option that's not compatible with FMG, such as --add-opens

I edited the comment in the test to make it clear that the JVM options affects the writing of the archive. I also modified the log to something like this:


Using AOT-linked classes: false (static archive: no aot-linked classes)

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PR Review Comment: https://git.openjdk.org/jdk/pull/20843#discussion_r1757622228