On Wed, 8 Mar 2023 22:59:23 GMT, Doug Simon <dnsi...@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.
>
> Doug Simon has updated the pull request with a new target base due to a merge
> or a rebase. The pull request now contains seven commits:
>
> - Merge remote-tracking branch 'openjdk-jdk/master' into JDK-8303431
> - switched to use of lists and maps instead of arrays
> - fixed whitespace
> - added support for inherited annotations
> - Merge branch 'master' into JDK-8303431
> - made AnnotationDataDecoder package-private
> - add annotation API to JVMCI
I looked on Hotspot, JVMCI and VMSupport.java changes. But you need to ask Tom
to look on JVMCI changes in details. And someone from core-libs who familiar
with Annotations have to comment on your implementation in general because I am
not expert.
-------------
Marked as reviewed by kvn (Reviewer).
PR: https://git.openjdk.org/jdk/pull/12810
