[14] RFR (S): 8235934: gc/g1/TestGCLogMessages.java fails with 'DerivedPointerTable Update' found

[Kim Barrett]

> On Dec 17, 2019, at 4:27 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> Hi all,
> 
>  can I have reviews for this testbug where there is a mismatch between "C2 compiler is enabled" and "C2 compiler is compiled in" in verifying output messages.
> 
> I.e. G1 prints some additional log messages if the C2 compiler is compiled in, but the test checks this message for (non-)existence if the C2 compiler is enabled.
> 
> Since there are a few flags that can toggle compiler use even when compiled in (UseCompiler, TieredStopAtLevel<=3, ...) the GC prints that message but the test does not expect it.
> 
> The fix is to add a whitebox method that specifically returns whether the C2 compiler is compiled in or not, to be used by the test.
> 
> I would like to push this to 14 even if it is P4 because of the test bug exemption, returning unnecessary reproducable errors.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8235934
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8235934/webrev/
> Testing:
> hs-tier1-3, local runs of TestGCLogMessages.java
> 
> Thanks,
>  Thomas

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src/hotspot/share/prims/whitebox.cpp  
1990 #if COMPILER2_OR_JVMCI
1991   return true;
1992 #else
1993   return false;
1994 #endif

This could perhaps be just

  return bool(COMPILER_OR_JVMCI);

That will fail to compile if COMPILER_OR_JVMCI is not defined at all;
not sure whether that's a pro or con for this alternative form.

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src/hotspot/share/prims/whitebox.cpp  
1989 WB_ENTRY(jboolean, WB_isC2OrGraalIncludedInVmBuild(JNIEnv* env))

I think the name ought to use "Jvmci" rather than "Graal".

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