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/*
* Copyright (c) 2014, 2017, 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.lang.invoke;
import jdk.internal.vm.annotation.ForceInline;
import jdk.internal.vm.annotation.Stable;
import java.lang.invoke.VarHandle.AccessMode;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;
/**
* A var handle form containing a set of member name, one for each operation.
* Each member characterizes a static method.
*/
final class VarForm {
final @Stable MethodType[] methodType_table;
final @Stable MemberName[] memberName_table;
VarForm(Class<?> implClass, Class<?> receiver, Class<?> value, Class<?>... intermediate) {
this.methodType_table = new MethodType[VarHandle.AccessType.values().length];
// TODO lazily calculate
this.memberName_table = linkFromStatic(implClass);
// (Receiver, <Intermediates>)
List<Class<?>> l = new ArrayList<>();
if (receiver != null)
l.add(receiver);
for (Class<?> c : intermediate)
l.add(c);
// (Receiver, <Intermediates>)Value
methodType_table[VarHandle.AccessType.GET.ordinal()] =
MethodType.methodType(value, l).erase();
// (Receiver, <Intermediates>, Value)void
l.add(value);
methodType_table[VarHandle.AccessType.SET.ordinal()] =
MethodType.methodType(void.class, l).erase();
// (Receiver, <Intermediates>, Value)Value
methodType_table[VarHandle.AccessType.GET_AND_UPDATE.ordinal()] =
MethodType.methodType(value, l).erase();
// (Receiver, <Intermediates>, Value, Value)boolean
l.add(value);
methodType_table[VarHandle.AccessType.COMPARE_AND_SET.ordinal()] =
MethodType.methodType(boolean.class, l).erase();
// (Receiver, <Intermediates>, Value, Value)Value
methodType_table[VarHandle.AccessType.COMPARE_AND_EXCHANGE.ordinal()] =
MethodType.methodType(value, l).erase();
}
@ForceInline
final MethodType getMethodType(int type) {
return methodType_table[type];
}
@ForceInline
final MemberName getMemberName(int mode) {
// TODO calculate lazily
MemberName mn = memberName_table[mode];
if (mn == null) {
throw new UnsupportedOperationException();
}
return mn;
}
@Stable
MethodType[] methodType_V_table;
@ForceInline
final MethodType[] getMethodType_V_init() {
MethodType[] table = new MethodType[VarHandle.AccessType.values().length];
for (int i = 0; i < methodType_table.length; i++) {
MethodType mt = methodType_table[i];
// TODO only adjust for sig-poly methods returning Object
table[i] = mt.changeReturnType(void.class);
}
methodType_V_table = table;
return table;
}
@ForceInline
final MethodType getMethodType_V(int type) {
MethodType[] table = methodType_V_table;
if (table == null) {
table = getMethodType_V_init();
}
return table[type];
}
/**
* Link all signature polymorphic methods.
*/
private static MemberName[] linkFromStatic(Class<?> implClass) {
MemberName[] table = new MemberName[AccessMode.values().length];
for (Class<?> c = implClass; c != VarHandle.class; c = c.getSuperclass()) {
for (Method m : c.getDeclaredMethods()) {
if (Modifier.isStatic(m.getModifiers())) {
AccessMode am = AccessMode.methodNameToAccessMode.get(m.getName());
if (am != null) {
assert table[am.ordinal()] == null;
table[am.ordinal()] = new MemberName(m);
}
}
}
}
return table;
}
}
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