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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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77
src/java.base/share/classes/java/lang/invoke/X-VarHandle.java.template
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2015, 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
@ -27,7 +27,9 @@ package java.lang.invoke;
import jdk.internal.util.Preconditions;
import jdk.internal.vm.annotation.ForceInline;
import java.lang.invoke.VarHandle.VarHandleDesc;
import java.util.Objects;
import java.util.Optional;
import static java.lang.invoke.MethodHandleStatics.UNSAFE;
@ -61,6 +63,30 @@ final class VarHandle$Type$s {
return accessMode.at.accessModeType(receiverType, {#if[Object]?fieldType:$type$.class});
}
@Override
final boolean internalEquals(VarHandle vh) {
FieldInstanceReadOnly that = (FieldInstanceReadOnly) vh;
return fieldOffset == that.fieldOffset;
}
@Override
final int internalHashCode() {
return Long.hashCode(fieldOffset);
}
@Override
public Optional<VarHandleDesc> describeConstable() {
var receiverTypeRef = receiverType.describeConstable();
var fieldTypeRef = {#if[Object]?fieldType:$type$.class}.describeConstable();
if (!receiverTypeRef.isPresent() || !fieldTypeRef.isPresent())
return Optional.empty();
// Reflect on this VarHandle to extract the field name
String name = VarHandles.getFieldFromReceiverAndOffset(
receiverType, fieldOffset, {#if[Object]?fieldType:$type$.class}).getName();
return Optional.of(VarHandleDesc.ofField(receiverTypeRef.get(), name, fieldTypeRef.get()));
}
@ForceInline
static $type$ get(FieldInstanceReadOnly handle, Object holder) {
return UNSAFE.get$Type$(Objects.requireNonNull(handle.receiverType.cast(holder)),
@ -323,6 +349,32 @@ final class VarHandle$Type$s {
#end[Object]
}
@Override
final boolean internalEquals(VarHandle vh) {
FieldStaticReadOnly that = (FieldStaticReadOnly) vh;
return base == that.base && fieldOffset == that.fieldOffset;
}
@Override
final int internalHashCode() {
return 31 * Long.hashCode(fieldOffset) + base.hashCode();
}
@Override
public Optional<VarHandleDesc> describeConstable() {
var fieldTypeRef = {#if[Object]?fieldType:$type$.class}.describeConstable();
if (!fieldTypeRef.isPresent())
return Optional.empty();
// Reflect on this VarHandle to extract the field name
var staticField = VarHandles.getStaticFieldFromBaseAndOffset(
base, fieldOffset, {#if[Object]?fieldType:$type$.class});
var receiverTypeRef = staticField.getDeclaringClass().describeConstable();
if (!receiverTypeRef.isPresent())
return Optional.empty();
return Optional.of(VarHandleDesc.ofStaticField(receiverTypeRef.get(), staticField.getName(), fieldTypeRef.get()));
}
@Override
final MethodType accessModeTypeUncached(AccessMode accessMode) {
return accessMode.at.accessModeType(null, {#if[Object]?fieldType:$type$.class});
@ -587,6 +639,29 @@ final class VarHandle$Type$s {
#end[Object]
}
@Override
final boolean internalEquals(VarHandle vh) {
// Equality of access mode types of AccessMode.GET is sufficient for
// equality checks
return true;
}
@Override
final int internalHashCode() {
// The hash code of the access mode types of AccessMode.GET is
// sufficient for hash code generation
return 0;
}
@Override
public Optional<VarHandleDesc> describeConstable() {
var arrayTypeRef = {#if[Object]?arrayType:$type$[].class}.describeConstable();
if (!arrayTypeRef.isPresent())
return Optional.empty();
return Optional.of(VarHandleDesc.ofArray(arrayTypeRef.get()));
}
@Override
final MethodType accessModeTypeUncached(AccessMode accessMode) {
return accessMode.at.accessModeType({#if[Object]?arrayType:$type$[].class}, {#if[Object]?arrayType.getComponentType():$type$.class}, int.class);