RFR: JDK-8313764: Offer JVM HS functionality to shared lib load operations done by the JDK codebase

[Alan Bateman]

On Mon, 14 Aug 2023 07:48:00 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> Currently there is a number of functionality that would be interesting to have for shared lib load operations in the JDK C code.
> Some examples :
> Events::log_dll_message for hs-err files reporting
> JFR event NativeLibraryLoad
> There is the need to update the shared lib Cache on AIX ( see LoadedLibraries::reload() , see also https://bugs.openjdk.org/browse/JDK-8314152 ),
> this is currently not fully in sync with libs loaded form jdk c-libs and sometimes reports outdated information
> 
> Offer an interface (e.g. jvm.cpp) to support this.

Having dlopen usages in non-core native libraries such as such as libsctp, libawt_xawt, ... have their dlopen usages compiled to use dlopen_ext in libjvm introduces questionable coupling that I think requires broader discussion. For the JFR NativeLibraryLoad event then I suppose there is a discussion on whether events for statically or dynamically loaded libs is interesting or not as there isn't a corresponding System.loadLibrary or SymbolLookup.libraryLookup. JDK-8314152 seems to very AIX specific with shared lib caching that I would hope complicate interfaces for other ports.

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PR Comment: https://git.openjdk.org/jdk/pull/15264#issuecomment-1676938047