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Merge pull request #18734 from uschindler/painless_arraylength_java9_factory

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painless: Add support for the new Java 9 MethodHandles#arrayLength() factory
This commit is contained in:
Robert Muir 2016-06-03 18:21:30 -04:00
commit 619b8831f9
1 changed files with 30 additions and 2 deletions
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32
modules/lang-painless/src/main/java/org/elasticsearch/painless/Def.java
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@ -53,7 +53,7 @@ public final class Def {
/** Helper class for isolating MethodHandles and methods to get the length of arrays /** Helper class for isolating MethodHandles and methods to get the length of arrays
* (to emulate a "arraystore" bytecode using MethodHandles). * (to emulate a "arraystore" bytecode using MethodHandles).
* This should really be a method in {@link MethodHandles} class! * See: https://bugs.openjdk.java.net/browse/JDK-8156915
*/ */
@SuppressWarnings("unused") // getArrayLength() methods are are actually used, javac just does not know :) @SuppressWarnings("unused") // getArrayLength() methods are are actually used, javac just does not know :)
private static final class ArrayLengthHelper { private static final class ArrayLengthHelper {
@ -103,6 +103,8 @@ public final class Def {
private static final MethodHandle LIST_GET; private static final MethodHandle LIST_GET;
/** pointer to List.set(int,Object) */ /** pointer to List.set(int,Object) */
private static final MethodHandle LIST_SET; private static final MethodHandle LIST_SET;
/** factory for arraylength MethodHandle (intrinsic) from Java 9 */
private static final MethodHandle JAVA9_ARRAY_LENGTH_MH_FACTORY;
static { static {
final Lookup lookup = MethodHandles.publicLookup(); final Lookup lookup = MethodHandles.publicLookup();
@ -115,11 +117,37 @@ public final class Def {
} catch (final ReflectiveOperationException roe) { } catch (final ReflectiveOperationException roe) {
throw new AssertionError(roe); throw new AssertionError(roe);
} }
// lookup up the factory for arraylength MethodHandle (intrinsic) from Java 9:
// https://bugs.openjdk.java.net/browse/JDK-8156915
MethodHandle arrayLengthMHFactory;
try {
arrayLengthMHFactory = lookup.findStatic(MethodHandles.class, "arrayLength",
MethodType.methodType(MethodHandle.class, Class.class));
} catch (final ReflectiveOperationException roe) {
arrayLengthMHFactory = null;
}
JAVA9_ARRAY_LENGTH_MH_FACTORY = arrayLengthMHFactory;
} }
/** Hack to rethrow unknown Exceptions from {@link MethodHandle#invokeExact}: */
@SuppressWarnings("unchecked")
private static <T extends Throwable> void rethrow(Throwable t) throws T {
throw (T) t;
}
/** Returns an array length getter MethodHandle for the given array type */ /** Returns an array length getter MethodHandle for the given array type */
static MethodHandle arrayLengthGetter(Class<?> arrayType) { static MethodHandle arrayLengthGetter(Class<?> arrayType) {
return ArrayLengthHelper.arrayLengthGetter(arrayType); if (JAVA9_ARRAY_LENGTH_MH_FACTORY != null) {
try {
return (MethodHandle) JAVA9_ARRAY_LENGTH_MH_FACTORY.invokeExact(arrayType);
} catch (Throwable t) {
rethrow(t);
throw new AssertionError(t);
}
} else {
return ArrayLengthHelper.arrayLengthGetter(arrayType);
}
} }
/** /**