RFR: 8295974: jni_FatalError and Xcheck:jni warnings should print the native stack when there are no Java frames

[Johan Sjölen]

On Fri, 16 Dec 2022 07:07:06 GMT, David Holmes <dholmes at openjdk.org> wrote:

> If a JNI Fatal error, or a JNI warning (from Xcheck:jni) is triggered in "top-level" native code (such as the launcher itself, or a freshly attached native thread) then there is no stack printed as there are no Java frames. This enhancement changes that so that we print the native stack, similarly to how error reporting does. We reuse VMError::print_native _stack to do this, but it could be argued this should be moved to a more general purpose utility class - suggestions welcome.
> 
> Testing:
>   - manual fault injection (see bug report)
>   - tiers 1-4
> 
> Thanks.

Hi David, the change looks good to me. Is there a particular reason that you chose resource allocation here instead of allocating the buffer on the stack? It should have the same effect.

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PR: https://git.openjdk.org/jdk/pull/11703