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Work around SecurityManager issues during initialization of vector api (JDK-8309727) (#12362)

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Uwe Schindler 2023-06-09 22:07:31 +02:00 committed by GitHub
parent a51241e4c9
commit ef35e6edf4
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1 changed files with 21 additions and 5 deletions
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26
lucene/core/src/java20/org/apache/lucene/util/VectorUtilPanamaProvider.java
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@ -16,6 +16,8 @@
*/
package org.apache.lucene.util;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.logging.Logger;
import jdk.incubator.vector.ByteVector;
import jdk.incubator.vector.FloatVector;
@ -29,11 +31,7 @@ import jdk.incubator.vector.VectorSpecies;
/** A VectorUtil provider implementation that leverages the Panama Vector API. */
final class VectorUtilPanamaProvider implements VectorUtilProvider {
/**
* The bit size of the preferred species (this field is package private to allow the lookup to
* load it).
*/
static final int INT_SPECIES_PREF_BIT_SIZE = IntVector.SPECIES_PREFERRED.vectorBitSize();
private static final int INT_SPECIES_PREF_BIT_SIZE = IntVector.SPECIES_PREFERRED.vectorBitSize();
private static final VectorSpecies<Float> PREF_FLOAT_SPECIES = FloatVector.SPECIES_PREFERRED;
private static final VectorSpecies<Byte> PREF_BYTE_SPECIES;
@ -62,11 +60,29 @@ final class VectorUtilPanamaProvider implements VectorUtilProvider {
}
}
// Extracted to a method to be able to apply the SuppressForbidden annotation
@SuppressWarnings("removal")
@SuppressForbidden(reason = "security manager")
private static <T> T doPrivileged(PrivilegedAction<T> action) {
return AccessController.doPrivileged(action);
}
VectorUtilPanamaProvider() {
if (INT_SPECIES_PREF_BIT_SIZE < 128) {
throw new UnsupportedOperationException(
"Vector bit size is less than 128: " + INT_SPECIES_PREF_BIT_SIZE);
}
// hack to work around for JDK-8309727:
try {
doPrivileged(
() ->
FloatVector.fromArray(PREF_FLOAT_SPECIES, new float[PREF_FLOAT_SPECIES.length()], 0));
} catch (SecurityException se) {
throw new UnsupportedOperationException(
"We hit initialization failure described in JDK-8309727: " + se);
}
var log = Logger.getLogger(getClass().getName());
log.info(
"Java vector incubator API enabled; uses preferredBitSize=" + INT_SPECIES_PREF_BIT_SIZE);