Integrated: 8331671: Implement JEP 472: Prepare to Restrict the Use of JNI

[Maurizio Cimadamore]

On Mon, 13 May 2024 10:42:26 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> This PR implements [JEP 472](https://openjdk.org/jeps/472), by restricting the use of JNI in the following ways:
> 
> * `System::load` and `System::loadLibrary` are now restricted methods
> * `Runtime::load` and `Runtime::loadLibrary` are now restricted methods
> * binding a JNI `native` method declaration to a native implementation is now considered a restricted operation
> 
> This PR slightly changes the way in which the JDK deals with restricted methods, even for FFM API calls. In Java 22, the single `--enable-native-access` was used both to specify a set of modules for which native access should be allowed *and* to specify whether illegal native access (that is, native access occurring from a module not specified by `--enable-native-access`) should be treated as an error or a warning. More specifically, an error is only issued if the `--enable-native-access flag` is used at least once.
> 
> Here, a new flag is introduced, namely `illegal-native-access=allow/warn/deny`, which is used to specify what should happen when access to a restricted method and/or functionality is found outside the set of modules specified with `--enable-native-access`. The default policy is `warn`, but users can select `allow` to suppress the warnings, or `deny` to cause `IllegalCallerException` to be thrown. This aligns the treatment of restricted methods with other mechanisms, such as `--illegal-access` and the more recent `--sun-misc-unsafe-memory-access`.
> 
> Some changes were required in the package-info javadoc for `java.lang.foreign`, to reflect the changes in the command line flags described above.

This pull request has now been integrated.

Changeset: 20d8f58c
Author:    Maurizio Cimadamore <mcimadamore at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/20d8f58c92009a46dfb91b951e7d87b4cb8e8b41
Stats:     532 lines in 107 files changed: 341 ins; 52 del; 139 mod

8331671: Implement JEP 472: Prepare to Restrict the Use of JNI

Reviewed-by: jpai, prr, ihse, kcr, alanb

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PR: https://git.openjdk.org/jdk/pull/19213