Withdrawn: 8303431: [JVMCI] libgraal annotation API

[Doug Simon]

On Wed, 1 Mar 2023 18:07:34 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

> This PR extends JVMCI with new API (`jdk.vm.ci.meta.Annotated`) for accessing annotations. The main differences from `java.lang.reflect.AnnotatedElement` are:
> * Each `Annotated` method explicitly specifies the annotation type(s) for which it wants annotation data. That is, there is no direct equivalent of `AnnotatedElement.getAnnotations()`.
> * Annotation data is returned in a map-like object (of type `jdk.vm.ci.meta.AnnotationData`) instead of in an `Annotation` object. This works better for libgraal as it avoids the need for annotation types to be loaded and included in libgraal.
>  
> To demonstrate the new API, here's an example in terms `java.lang.reflect.AnnotatedElement` (which `ResolvedJavaType` implements):
> 
>     ResolvedJavaMethod method = ...;
>     ExplodeLoop a = method.getAnnotation(ExplodeLoop.class);
>     return switch (a.kind()) {
>         case FULL_UNROLL -> LoopExplosionKind.FULL_UNROLL;
>         case FULL_UNROLL_UNTIL_RETURN -> LoopExplosionKind.FULL_UNROLL_UNTIL_RETURN;
>         ...
>     }
> 
> 
> The same code using the new API:
> 
> 
>     ResolvedJavaMethod method = ...;
>     ResolvedJavaType explodeLoopType = ...;
>     AnnotationData a = method.getAnnotationDataFor(explodeLoopType);
>     return switch (a.getEnum("kind").getName()) {
>         case "FULL_UNROLL" -> LoopExplosionKind.FULL_UNROLL;
>         case "FULL_UNROLL_UNTIL_RETURN" -> LoopExplosionKind.FULL_UNROLL_UNTIL_RETURN;
>         ...
>     }
> 
> 
> The implementation relies on new methods in `jdk.internal.vm.VMSupport` for parsing annotations and serializing/deserializing to/from a byte array. This allows the annotation data to be passed from the HotSpot heap to the libgraal heap.

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/jdk/pull/12810