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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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37
src/java.base/share/classes/java/lang/invoke/VarHandles.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 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 +25,9 @@
package java.lang.invoke;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import static java.lang.invoke.MethodHandleStatics.UNSAFE;
final class VarHandles {
@ -144,6 +147,38 @@ final class VarHandles {
}
}
// Required by instance field handles
static Field getFieldFromReceiverAndOffset(Class<?> receiverType,
long offset,
Class<?> fieldType) {
for (Field f : receiverType.getDeclaredFields()) {
if (Modifier.isStatic(f.getModifiers())) continue;
if (offset == UNSAFE.objectFieldOffset(f)) {
assert f.getType() == fieldType;
return f;
}
}
throw new InternalError("Field not found at offset");
}
// Required by instance static field handles
static Field getStaticFieldFromBaseAndOffset(Object base,
long offset,
Class<?> fieldType) {
// @@@ This is a little fragile assuming the base is the class
Class<?> receiverType = (Class<?>) base;
for (Field f : receiverType.getDeclaredFields()) {
if (!Modifier.isStatic(f.getModifiers())) continue;
if (offset == UNSAFE.staticFieldOffset(f)) {
assert f.getType() == fieldType;
return f;
}
}
throw new InternalError("Static field not found at offset");
}
static VarHandle makeArrayElementHandle(Class<?> arrayClass) {
if (!arrayClass.isArray())
throw new IllegalArgumentException("not an array: " + arrayClass);