On Wed, 23 Apr 2025 00:56:18 GMT, Jiangli Zhou <jian...@openjdk.org> wrote:
>> Please review this PR that changes to use `NativeLibraries.loadLibrary()` >> for loading the `libsyslookup` in `jdk.internal.foreign.SystemLookup` class. >> >> `NativeLibraries.loadLibrary()` handles both the shared library and (static) >> built-in library loading properly. On `static-jdk`, calling >> `NativeLibraries.loadLibrary()` for `systlookup` library can find the >> built-in library by looking up using `JNI_OnLoad_syslookup`. The current >> change adds `DEF_STATIC_JNI_OnLoad` in syslookup.c (in shared, windows and >> aix versions) for that purpose. >> >> In addition to GHA testing, I tested the change on static-jdk with jdk tier1 >> tests on linux-x64 locally. All java/foreign/* jdk tier1 tests pass with the >> change. Without the change, there are about 60 java/foreign/* jdk tier1 >> tests fail on static-jdk. > > Jiangli Zhou has updated the pull request incrementally with two additional > commits since the last revision: > > - Merge branch 'JDK-8355080' of ssh://github.com/jianglizhou/jdk into > JDK-8355080 > - Address henryjen@ comment: > - Remove '#include <jni.h>'. Looks good to me -- but also risky. I'd prefer if @JornVernee could also take a look. The changes here look good. Essentially, if `syslookup` is statically linked, trying to do a `dlopen` on it will fail, as the shared library for it doesn't exist. For this reason, this PR seems to "upgrade" syslookup to a JNI library. The presence of the `JNI_OnLoad_syslookup` is then used, as per [JEP 178](https://openjdk.org/jeps/178) to determine whether `syslookup` is a "builtin" library -- that is, a library for which no dynamic linking should occur. The loaded library is associated with the boot classloader. This could be problematic, in principle. However, since the requests to `loadLibrary` also come from the boot loader (they are from the `SystemLookup` class) it all works out ok. Having to upgrade to JNI is a bit sad -- although I get that it is required as a workaround for now. For the longer term I'd prefer a better way to integrate static lookups in the FFM API. For instance, all `JNI::loadLibrary` does when it comes to static libraries is to return the so called "process handle" -- e.g. a handle to the running process (the JVM). If there was a way to retrieve such a handle (e.g. via a dedicated `SymbolLookup` factory) it would be possible to avoid the JNI dance: just get the process symbol lookup, and look for statically linked symbols in there. ------------- Marked as reviewed by mcimadamore (Reviewer). PR Review: https://git.openjdk.org/jdk/pull/24801#pullrequestreview-2798483910 PR Comment: https://git.openjdk.org/jdk/pull/24801#issuecomment-2834427351
