RFR: 8276711: compiler/codecache/cli tests failing when SegmentedCodeCache used with -Xint

[Vladimir Kozlov]

On Tue, 1 Mar 2022 22:57:14 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> `SegmentedCodeCache` should be set in `compiler/compilerDefinitions.cpp`:
>> https://github.com/openjdk/jdk/blob/master/src/hotspot/share/compiler/compilerDefinitions.cpp#L294
>
> I replied on email but I don't see it and this is better here.  I should really change this to be:
> 
> if (FLAG_IS_CMDLINE(SegmentedCodeCache)) {
> }
> Since this code is checking for someone setting it on the command line with -Xint.  The code in compilerDefinitions.cpp sets the flag ergonomically if the code cache is big and if tiered compilation is on.  I believe this is after the code in arguments.cpp.  So this code won't reset it to true, if I'm following it right.
> edit: yes, I'll check the flag in compilerDefinitions.cpp.

I agree that the warning should be issued if flag is set on command line together with `-Xint`.
In this case you need add this check to `CompilerConfig::check_args_consistency()` where different compiler flags are set to false when we run with Interpreter:
https://github.com/openjdk/jdk/blob/master/src/hotspot/share/compiler/compilerDefinitions.cpp#L493

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PR: https://git.openjdk.java.net/jdk/pull/7650