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8210031: implementation for JVM Constants API

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Co-authored-by: Brian Goetz <brian.goetz@oracle.com>
Reviewed-by: jrose, mcimadamore, darcy, mchung, rriggs, dholmes, forax
This commit is contained in:
Vicente Romero 2018-12-09 12:36:24 -05:00
parent b80d335354
commit 9846588b31
72 changed files with 6719 additions and 103 deletions
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35
src/java.base/share/classes/java/lang/Double.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1994, 2017, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1994, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -25,6 +25,11 @@
package java.lang;
import java.lang.invoke.MethodHandles;
import java.lang.constant.Constable;
import java.lang.constant.ConstantDesc;
import java.util.Optional;
import jdk.internal.math.FloatingDecimal;
import jdk.internal.math.DoubleConsts;
import jdk.internal.HotSpotIntrinsicCandidate;
@ -46,7 +51,8 @@ import jdk.internal.HotSpotIntrinsicCandidate;
* @author Joseph D. Darcy
* @since 1.0
*/
public final class Double extends Number implements Comparable<Double> {
public final class Double extends Number
implements Comparable<Double>, Constable, ConstantDesc {
/**
* A constant holding the positive infinity of type
* {@code double}. It is equal to the value returned by
@ -1070,6 +1076,31 @@ public final class Double extends Number implements Comparable<Double> {
return Math.min(a, b);
}
/**
* Returns a nominal descriptor for this instance, which is the instance
* itself.
*
* @return an {@link Optional} describing the {@linkplain Double} instance
* @since 12
*/
@Override
public Optional<Double> describeConstable() {
return Optional.of(this);
}
/**
* Resolves this instance as a {@link ConstantDesc}, the result of which is
* the instance itself.
*
* @param lookup ignored
* @return the {@linkplain Double} instance
* @since 12
*/
@Override
public Double resolveConstantDesc(MethodHandles.Lookup lookup) {
return this;
}
/** use serialVersionUID from JDK 1.0.2 for interoperability */
private static final long serialVersionUID = -9172774392245257468L;
}