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8241100: Make Boolean, Character, Byte, and Short implement Constable

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Reviewed-by: jrose, briangoetz, psandoz
This commit is contained in:
Jorn Vernee 2020-05-04 09:41:01 -07:00
parent 2d8bea8c1d
commit 31041d406a
8 changed files with 330 additions and 14 deletions
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23
src/java.base/share/classes/java/lang/Boolean.java
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@ -27,6 +27,15 @@ package java.lang;
import jdk.internal.HotSpotIntrinsicCandidate;
import java.lang.constant.Constable;
import java.lang.constant.ConstantDesc;
import java.lang.constant.ConstantDescs;
import java.lang.constant.DynamicConstantDesc;
import java.util.Optional;
import static java.lang.constant.ConstantDescs.BSM_GET_STATIC_FINAL;
import static java.lang.constant.ConstantDescs.CD_Boolean;
/**
* The Boolean class wraps a value of the primitive type
* {@code boolean} in an object. An object of type
@ -43,7 +52,7 @@ import jdk.internal.HotSpotIntrinsicCandidate;
* @since 1.0
*/
public final class Boolean implements java.io.Serializable,
Comparable<Boolean>
Comparable<Boolean>, Constable
{
/**
* The {@code Boolean} object corresponding to the primitive
@ -344,4 +353,16 @@ public final class Boolean implements java.io.Serializable,
public static boolean logicalXor(boolean a, boolean b) {
return a ^ b;
}
/**
* Returns an {@link Optional} containing the nominal descriptor for this
* instance.
*
* @return an {@link Optional} describing the {@linkplain Boolean} instance
* @since 15
*/
@Override
public Optional<DynamicConstantDesc<Boolean>> describeConstable() {
return Optional.of(value ? ConstantDescs.TRUE : ConstantDescs.FALSE);
}
}