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.
-------------
Commit messages:
- made AnnotationDataDecoder package-private
- add annotation API to JVMCI
Changes: https://git.openjdk.org/jdk/pull/12810/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12810&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8303431
Stats: 2666 lines in 33 files changed: 2614 ins; 24 del; 28 mod
Patch: https://git.openjdk.org/jdk/pull/12810.diff
Fetch: git fetch https://git.openjdk.org/jdk pull/12810/head:pull/12810
PR: https://git.openjdk.org/jdk/pull/12810
