RFR: 8260934: java/lang/StringBuilder/HugeCapacity.java fails without Compact Strings

[Ioi Lam]

On Tue, 9 Feb 2021 17:56:15 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> > There's an existing test that explicitly tests both `-XX:+CompactStrings` and `-XX:-CompactStrings`. Maybe we can do the same thing?
> 
> No, I don't think we can. In other tests, the conflict between `-XX:+CompactStrings` and `-XX:-CompactStrings` would select one of the modes, so both test configurations would degenerate into one config (run twice).

I tried running `jtreg -vmoptions:-XX:+CompactStrings TestMethodNames.java` and the log file shows:

(the first @test)
-XX:+CompactStrings \
-XX:+CompactStrings \
com.sun.javatest.regtest.agent.MainWrapper /jdk2/tmp/jtreg/work/runtime/CompactStrings/TestMethodNames.d/main.0.jta

(the second @test)
-XX:+CompactStrings \
-XX:-CompactStrings \
com.sun.javatest.regtest.agent.MainWrapper /jdk2/tmp/jtreg/work/runtime/CompactStrings/TestMethodNames.d/main.1.jta

The VM options specified by the `@test` line are appended after the options specified by `-vmoptions`. So this test is executed in two different configurations (not twice in the same configuration).

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PR: https://git.openjdk.java.net/jdk/pull/2355