RFR: JDK-8276422 Add command-line option to disable finalization [v3]

[Mandy Chung]

On Thu, 18 Nov 2021 06:49:03 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> src/hotspot/share/prims/jvm.cpp line 694:
>> 
>>> 692: 
>>> 693: JVM_ENTRY(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
>>> 694: return InstanceKlass::finalization_enabled() ? JNI_TRUE : JNI_FALSE;
>> 
>> missing indentation
>
> I think this could just be `return InstanceKlass::finalization_enabled();`.  There is lots of code in this file and elsewhere that assumes C++ `bool` converts to `jboolean` appropriately.

One typical way for VM to pass the arguments to the library is via private system properties.   System::initPhase1 will save the VM properties in `jdk.internal.misc.VM` and filters out the private properties from the system properties returned from System::getProperties (see System::createProperties).

You can query the flag via `jdk.internal.misc.VM.getProperty("jdk.finalization.disabled")` for example.

I don't see any issue moving the Finalizer class initialization after initPhase1 since there is no finalizer during VM startup.

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PR: https://git.openjdk.java.net/jdk/pull/6442