Integrated: 8338596: Clarify handling of restricted and caller-sensitive methods

[Maurizio Cimadamore]

On Wed, 18 Sep 2024 15:47:01 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> This PR moves the section on restricted methods from the the javadoc of `java.lang.foreign` package into a standalone static [javadoc page](https://cr.openjdk.org/~mcimadamore/jdk/restricted_javadoc_section/docs/api/java.base/java/lang/foreign/doc-files/RestrictedMethods.html).
> 
> This is because, after [JEP 472](https://openjdk.org/jeps/472), we now have restricted methods *outside* the foreign package, namely `System::loadLibrary`, `Runtime::loadLibrary` (and related methods). And, even before, we also had a restricted method in `ModuleLayer.Controller`.
> 
> The new static page contains some guidance of what happens when a restricted method is called when there's no Java frame on the stack (this can happen e.g. when upcalling into a restricted method from a native thread not known to the JVM) - that is, the call is treated as originating from an unnamed module.
> 
> The static page is linked from the restricted method banner in a restricted method javadoc. Here's an [example](https://cr.openjdk.org/~mcimadamore/jdk/restricted_javadoc_section/docs/api/java.base/java/lang/foreign/Linker.html#downcallHandle(java.lang.foreign.MemorySegment,java.lang.foreign.FunctionDescriptor,java.lang.foreign.Linker.Option...)).

This pull request has now been integrated.

Changeset: f4dccfd4
Author:    Maurizio Cimadamore <mcimadamore at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/f4dccfd4cf354f360b823c8cce15bb54ef90e9ca
Stats:     119 lines in 5 files changed: 70 ins; 41 del; 8 mod

8338596: Clarify handling of restricted and caller-sensitive methods

Co-authored-by: Hannes Wallnöfer <hannesw at openjdk.org>
Reviewed-by: alanb, jvernee

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PR: https://git.openjdk.org/jdk/pull/21067