/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandleInfo;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodHandles.Lookup;
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import java.lang.invoke.MethodType;
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import java.lang.invoke.WrongMethodTypeException;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.nio.charset.Charset;
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import java.nio.charset.StandardCharsets;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import other.Chatty;
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public class Main {
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public static class A {
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public A() {}
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public void foo() {
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System.out.println("foo_A");
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}
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public static final Lookup lookup = MethodHandles.lookup();
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}
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public static class B extends A {
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public void foo() {
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System.out.println("foo_B");
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}
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public static final Lookup lookup = MethodHandles.lookup();
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}
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public static class C extends B {
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public static final Lookup lookup = MethodHandles.lookup();
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}
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public static class D {
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private final void privateRyan() {
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System.out.println("privateRyan_D");
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}
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public static final Lookup lookup = MethodHandles.lookup();
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}
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public static class E extends D {
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public static final Lookup lookup = MethodHandles.lookup();
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}
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private interface F {
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public default void sayHi() {
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System.out.println("F.sayHi()");
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}
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}
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public static class G implements F {
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public void sayHi() {
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System.out.println("G.sayHi()");
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}
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public MethodHandles.Lookup getLookup() {
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return MethodHandles.lookup();
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}
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}
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public static class H implements Chatty {
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public void chatter() {
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System.out.println("H.chatter()");
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}
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public MethodHandles.Lookup getLookup() {
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return MethodHandles.lookup();
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}
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}
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public static void main(String[] args) throws Throwable {
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testfindSpecial_invokeSuperBehaviour();
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testfindSpecial_invokeDirectBehaviour();
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testExceptionDetailMessages();
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testfindVirtual();
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testfindStatic();
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testUnreflects();
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testAsType();
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testConstructors();
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testStringConstructors();
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testReturnValues();
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testReturnValueConversions();
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testVariableArity();
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testVariableArity_MethodHandles_bind();
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testRevealDirect();
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testReflectiveCalls();
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}
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public static void testfindSpecial_invokeSuperBehaviour() throws Throwable {
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// This is equivalent to an invoke-super instruction where the referrer
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// is B.class.
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MethodHandle mh1 = B.lookup.findSpecial(A.class /* refC */, "foo",
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MethodType.methodType(void.class), B.class /* specialCaller */);
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A aInstance = new A();
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B bInstance = new B();
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C cInstance = new C();
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// This should be as if an invoke-super was called from one of B's methods.
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mh1.invokeExact(bInstance);
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mh1.invoke(bInstance);
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// This should not work. The receiver type in the handle will be suitably
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// restricted to B and subclasses.
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try {
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mh1.invoke(aInstance);
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System.out.println("mh1.invoke(aInstance) should not succeeed");
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} catch (ClassCastException expected) {
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}
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try {
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mh1.invokeExact(aInstance);
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System.out.println("mh1.invoke(aInstance) should not succeeed");
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} catch (WrongMethodTypeException expected) {
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}
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// This should *still* be as if an invoke-super was called from one of C's
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// methods, despite the fact that we're operating on a C.
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mh1.invoke(cInstance);
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// Now that C is the special caller, the next invoke will call B.foo.
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MethodHandle mh2 = C.lookup.findSpecial(A.class /* refC */, "foo",
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MethodType.methodType(void.class), C.class /* specialCaller */);
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mh2.invokeExact(cInstance);
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// Shouldn't allow invoke-super semantics from an unrelated special caller.
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try {
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C.lookup.findSpecial(A.class, "foo",
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MethodType.methodType(void.class), D.class /* specialCaller */);
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System.out.println("findSpecial(A.class, foo, .. D.class) unexpectedly succeeded.");
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} catch (IllegalAccessException expected) {
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}
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// Check return type matches for find.
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try {
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B.lookup.findSpecial(A.class /* refC */, "foo",
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MethodType.methodType(int.class), B.class /* specialCaller */);
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fail();
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} catch (NoSuchMethodException e) {}
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// Check constructors
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try {
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B.lookup.findSpecial(A.class /* refC */, "<init>",
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MethodType.methodType(void.class), B.class /* specialCaller */);
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fail();
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} catch (NoSuchMethodException e) {}
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}
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public static void testfindSpecial_invokeDirectBehaviour() throws Throwable {
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D dInstance = new D();
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MethodHandle mh3 = D.lookup.findSpecial(D.class, "privateRyan",
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MethodType.methodType(void.class), D.class /* specialCaller */);
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mh3.invoke(dInstance);
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// The private method shouldn't be accessible from any special caller except
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// itself...
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try {
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D.lookup.findSpecial(D.class, "privateRyan", MethodType.methodType(void.class), C.class);
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System.out.println("findSpecial(privateRyan, C.class) unexpectedly succeeded");
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} catch (IllegalAccessException expected) {
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}
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// ... or from any lookup context except its own.
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try {
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E.lookup.findSpecial(D.class, "privateRyan", MethodType.methodType(void.class), E.class);
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System.out.println("findSpecial(privateRyan, E.class) unexpectedly succeeded");
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} catch (IllegalAccessException expected) {
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}
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}
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public static void testExceptionDetailMessages() throws Throwable {
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MethodHandle handle = MethodHandles.lookup().findVirtual(String.class, "concat",
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MethodType.methodType(String.class, String.class));
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try {
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handle.invokeExact("a", new Object());
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System.out.println("invokeExact(\"a\", new Object()) unexpectedly succeeded.");
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} catch (WrongMethodTypeException ex) {
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System.out.println("Received WrongMethodTypeException exception");
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}
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}
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public interface Foo {
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public String foo();
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}
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public interface Bar extends Foo {
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public String bar();
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}
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public static abstract class BarAbstractSuper {
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public abstract String abstractSuperPublicMethod();
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}
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public static class BarSuper extends BarAbstractSuper {
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public String superPublicMethod() {
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return "superPublicMethod";
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}
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protected String superProtectedMethod() {
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return "superProtectedMethod";
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}
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public String abstractSuperPublicMethod() {
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return "abstractSuperPublicMethod";
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}
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String superPackageMethod() {
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return "superPackageMethod";
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}
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}
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public static class BarImpl extends BarSuper implements Bar {
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public BarImpl() {
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}
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@Override
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public String foo() {
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return "foo";
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}
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@Override
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public String bar() {
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return "bar";
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}
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public String add(int x, int y) {
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return Arrays.toString(new int[] { x, y });
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}
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private String privateMethod() { return "privateMethod"; }
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public static String staticMethod() { return staticString; }
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private static String staticString;
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{
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// Static constructor
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staticString = Long.toString(System.currentTimeMillis());
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}
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static final MethodHandles.Lookup lookup = MethodHandles.lookup();
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}
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public static void testfindVirtual() throws Throwable {
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// Virtual lookups on static methods should not succeed.
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try {
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MethodHandles.lookup().findVirtual(
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BarImpl.class, "staticMethod", MethodType.methodType(String.class));
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System.out.println("findVirtual(staticMethod) unexpectedly succeeded");
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} catch (IllegalAccessException expected) {
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}
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// Virtual lookups on private methods should not succeed, unless the Lookup
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// context had sufficient privileges.
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try {
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MethodHandles.lookup().findVirtual(
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BarImpl.class, "privateMethod", MethodType.methodType(String.class));
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System.out.println("findVirtual(privateMethod) unexpectedly succeeded");
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} catch (IllegalAccessException expected) {
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}
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// Virtual lookup on a private method with a context that *does* have sufficient
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// privileges.
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MethodHandle mh = BarImpl.lookup.findVirtual(
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BarImpl.class, "privateMethod", MethodType.methodType(String.class));
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String str = (String) mh.invoke(new BarImpl());
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if (!"privateMethod".equals(str)) {
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System.out.println("Unexpected return value for BarImpl#privateMethod: " + str);
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}
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// Find virtual must find interface methods defined by interfaces implemented
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// by the class.
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mh = MethodHandles.lookup().findVirtual(BarImpl.class, "foo",
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MethodType.methodType(String.class));
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str = (String) mh.invoke(new BarImpl());
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if (!"foo".equals(str)) {
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System.out.println("Unexpected return value for BarImpl#foo: " + str);
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}
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// Find virtual should check rtype.
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try {
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mh = MethodHandles.lookup().findVirtual(BarImpl.class, "foo",
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MethodType.methodType(void.class));
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fail();
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} catch (NoSuchMethodException e) {}
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// And ptypes
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mh = MethodHandles.lookup().findVirtual(
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BarImpl.class, "add", MethodType.methodType(String.class, int.class, int.class));
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try {
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mh = MethodHandles.lookup().findVirtual(
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BarImpl.class, "add", MethodType.methodType(String.class, Integer.class, int.class));
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} catch (NoSuchMethodException e) {}
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// .. and their super-interfaces.
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mh = MethodHandles.lookup().findVirtual(BarImpl.class, "bar",
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MethodType.methodType(String.class));
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str = (String) mh.invoke(new BarImpl());
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if (!"bar".equals(str)) {
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System.out.println("Unexpected return value for BarImpl#bar: " + str);
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}
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mh = MethodHandles.lookup().findVirtual(Bar.class, "bar",
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MethodType.methodType(String.class));
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str = (String) mh.invoke(new BarImpl());
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if (!"bar".equals(str)) {
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System.out.println("Unexpected return value for BarImpl#bar: " + str);
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}
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mh = MethodHandles.lookup().findVirtual(BarAbstractSuper.class, "abstractSuperPublicMethod",
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MethodType.methodType(String.class));
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str = (String) mh.invoke(new BarImpl());
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if (!"abstractSuperPublicMethod".equals(str)) {
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System.out.println("Unexpected return value for BarImpl#abstractSuperPublicMethod: " + str);
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}
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// We should also be able to lookup public / protected / package methods in
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// the super class, given sufficient access privileges.
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mh = MethodHandles.lookup().findVirtual(BarImpl.class, "superPublicMethod",
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MethodType.methodType(String.class));
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str = (String) mh.invoke(new BarImpl());
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if (!"superPublicMethod".equals(str)) {
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System.out.println("Unexpected return value for BarImpl#superPublicMethod: " + str);
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}
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mh = MethodHandles.lookup().findVirtual(BarImpl.class, "superProtectedMethod",
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MethodType.methodType(String.class));
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str = (String) mh.invoke(new BarImpl());
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if (!"superProtectedMethod".equals(str)) {
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System.out.println("Unexpected return value for BarImpl#superProtectedMethod: " + str);
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}
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mh = MethodHandles.lookup().findVirtual(BarImpl.class, "superPackageMethod",
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MethodType.methodType(String.class));
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str = (String) mh.invoke(new BarImpl());
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if (!"superPackageMethod".equals(str)) {
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System.out.println("Unexpected return value for BarImpl#superPackageMethod: " + str);
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}
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try {
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MethodHandles.lookup().findVirtual(BarImpl.class, "<init>",
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MethodType.methodType(void.class));
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fail();
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} catch (NoSuchMethodException e) {}
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}
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public static void testfindStatic() throws Throwable {
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MethodHandles.lookup().findStatic(BarImpl.class, "staticMethod",
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MethodType.methodType(String.class));
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try {
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MethodHandles.lookup().findStatic(BarImpl.class, "staticMethod",
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MethodType.methodType(void.class));
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fail();
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} catch (NoSuchMethodException e) {}
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try {
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MethodHandles.lookup().findStatic(BarImpl.class, "staticMethod",
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MethodType.methodType(String.class, int.class));
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fail();
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} catch (NoSuchMethodException e) {}
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try {
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MethodHandles.lookup().findStatic(BarImpl.class, "<clinit>",
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MethodType.methodType(void.class));
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fail();
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} catch (NoSuchMethodException e) {}
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try {
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MethodHandles.lookup().findStatic(BarImpl.class, "<init>",
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MethodType.methodType(void.class));
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fail();
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} catch (NoSuchMethodException e) {}
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}
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static class UnreflectTester {
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public String publicField;
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private String privateField;
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public static String publicStaticField = "publicStaticValue";
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private static String privateStaticField = "privateStaticValue";
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private UnreflectTester(String val) {
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publicField = val;
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privateField = val;
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}
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// NOTE: The boolean constructor argument only exists to give this a
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// different signature.
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public UnreflectTester(String val, boolean unused) {
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this(val);
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}
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private static String privateStaticMethod() {
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return "privateStaticMethod";
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}
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private String privateMethod() {
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return "privateMethod";
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}
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public static String publicStaticMethod() {
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return "publicStaticMethod";
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}
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public String publicMethod() {
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return "publicMethod";
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}
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public String publicVarArgsMethod(String... args) {
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return "publicVarArgsMethod";
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}
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}
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public static void testUnreflects() throws Throwable {
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UnreflectTester instance = new UnreflectTester("unused");
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Method publicMethod = UnreflectTester.class.getMethod("publicMethod");
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MethodHandle mh = MethodHandles.lookup().unreflect(publicMethod);
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assertEquals("publicMethod", (String) mh.invoke(instance));
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assertEquals("publicMethod", (String) mh.invokeExact(instance));
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Method publicStaticMethod = UnreflectTester.class.getMethod("publicStaticMethod");
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mh = MethodHandles.lookup().unreflect(publicStaticMethod);
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assertEquals("publicStaticMethod", (String) mh.invoke());
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assertEquals("publicStaticMethod", (String) mh.invokeExact());
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Method privateMethod = UnreflectTester.class.getDeclaredMethod("privateMethod");
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try {
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mh = MethodHandles.lookup().unreflect(privateMethod);
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fail();
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} catch (IllegalAccessException expected) {}
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privateMethod.setAccessible(true);
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mh = MethodHandles.lookup().unreflect(privateMethod);
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assertEquals("privateMethod", (String) mh.invoke(instance));
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assertEquals("privateMethod", (String) mh.invokeExact(instance));
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Method privateStaticMethod = UnreflectTester.class.getDeclaredMethod("privateStaticMethod");
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try {
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mh = MethodHandles.lookup().unreflect(privateStaticMethod);
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fail();
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} catch (IllegalAccessException expected) {}
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privateStaticMethod.setAccessible(true);
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mh = MethodHandles.lookup().unreflect(privateStaticMethod);
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assertEquals("privateStaticMethod", (String) mh.invoke());
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assertEquals("privateStaticMethod", (String) mh.invokeExact());
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Constructor privateConstructor = UnreflectTester.class.getDeclaredConstructor(String.class);
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try {
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mh = MethodHandles.lookup().unreflectConstructor(privateConstructor);
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fail();
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} catch (IllegalAccessException expected) {}
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privateConstructor.setAccessible(true);
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mh = MethodHandles.lookup().unreflectConstructor(privateConstructor);
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instance = (UnreflectTester) mh.invokeExact("abc");
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assertEquals("abc", instance.publicField);
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instance = (UnreflectTester) mh.invoke("def");
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assertEquals("def", instance.publicField);
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Constructor publicConstructor = UnreflectTester.class.getConstructor(String.class,
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boolean.class);
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mh = MethodHandles.lookup().unreflectConstructor(publicConstructor);
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instance = (UnreflectTester) mh.invokeExact("abc", false);
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assertEquals("abc", instance.publicField);
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instance = (UnreflectTester) mh.invoke("def", true);
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assertEquals("def", instance.publicField);
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// TODO(narayan): Non exact invokes for field sets/gets are not implemented yet.
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//
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// assertEquals("instanceValue", (String) mh.invoke(new UnreflectTester("instanceValue")));
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Field publicField = UnreflectTester.class.getField("publicField");
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mh = MethodHandles.lookup().unreflectGetter(publicField);
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instance = new UnreflectTester("instanceValue");
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assertEquals("instanceValue", (String) mh.invokeExact(instance));
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mh = MethodHandles.lookup().unreflectSetter(publicField);
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instance = new UnreflectTester("instanceValue");
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mh.invokeExact(instance, "updatedInstanceValue");
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assertEquals("updatedInstanceValue", instance.publicField);
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Field publicStaticField = UnreflectTester.class.getField("publicStaticField");
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mh = MethodHandles.lookup().unreflectGetter(publicStaticField);
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UnreflectTester.publicStaticField = "updatedStaticValue";
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assertEquals("updatedStaticValue", (String) mh.invokeExact());
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mh = MethodHandles.lookup().unreflectSetter(publicStaticField);
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UnreflectTester.publicStaticField = "updatedStaticValue";
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mh.invokeExact("updatedStaticValue2");
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assertEquals("updatedStaticValue2", UnreflectTester.publicStaticField);
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Field privateField = UnreflectTester.class.getDeclaredField("privateField");
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try {
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mh = MethodHandles.lookup().unreflectGetter(privateField);
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fail();
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} catch (IllegalAccessException expected) {
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}
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try {
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mh = MethodHandles.lookup().unreflectSetter(privateField);
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fail();
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} catch (IllegalAccessException expected) {
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}
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privateField.setAccessible(true);
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mh = MethodHandles.lookup().unreflectGetter(privateField);
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instance = new UnreflectTester("instanceValue");
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assertEquals("instanceValue", (String) mh.invokeExact(instance));
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mh = MethodHandles.lookup().unreflectSetter(privateField);
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instance = new UnreflectTester("instanceValue");
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mh.invokeExact(instance, "updatedInstanceValue");
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assertEquals("updatedInstanceValue", instance.privateField);
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Field privateStaticField = UnreflectTester.class.getDeclaredField("privateStaticField");
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try {
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mh = MethodHandles.lookup().unreflectGetter(privateStaticField);
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fail();
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} catch (IllegalAccessException expected) {
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}
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try {
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mh = MethodHandles.lookup().unreflectSetter(privateStaticField);
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fail();
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} catch (IllegalAccessException expected) {
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}
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privateStaticField.setAccessible(true);
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mh = MethodHandles.lookup().unreflectGetter(privateStaticField);
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privateStaticField.set(null, "updatedStaticValue");
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assertEquals("updatedStaticValue", (String) mh.invokeExact());
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mh = MethodHandles.lookup().unreflectSetter(privateStaticField);
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privateStaticField.set(null, "updatedStaticValue");
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mh.invokeExact("updatedStaticValue2");
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assertEquals("updatedStaticValue2", (String) privateStaticField.get(null));
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// unreflectSpecial testing - F is an interface that G implements
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G g = new G();
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g.sayHi(); // prints "G.sayHi()"
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MethodHandles.Lookup lookupInG = g.getLookup();
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Method methodInG = G.class.getDeclaredMethod("sayHi");
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lookupInG.unreflectSpecial(methodInG, G.class).invoke(g); // prints "G.sayHi()"
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Method methodInF = F.class.getDeclaredMethod("sayHi");
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lookupInG.unreflect(methodInF).invoke(g); // prints "G.sayHi()"
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lookupInG.in(G.class).unreflectSpecial(methodInF, G.class).invoke(g); // prints "F.sayHi()"
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lookupInG.unreflectSpecial(methodInF, G.class).bindTo(g).invokeWithArguments();
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// unreflectSpecial testing - other.Chatty is an interface that H implements
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H h = new H();
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h.chatter();
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MethodHandles.Lookup lookupInH = h.getLookup();
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Method methodInH = H.class.getDeclaredMethod("chatter");
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lookupInH.unreflectSpecial(methodInH, H.class).invoke(h);
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Method methodInChatty = Chatty.class.getDeclaredMethod("chatter");
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lookupInH.unreflect(methodInChatty).invoke(h);
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lookupInH.in(H.class).unreflectSpecial(methodInChatty, H.class).invoke(h);
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lookupInH.unreflectSpecial(methodInChatty, H.class).bindTo(h).invokeWithArguments();
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}
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// This method only exists to fool Jack's handling of types. See b/32536744.
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public static CharSequence getSequence() {
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return "foo";
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}
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public static void testAsType() throws Throwable {
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// The type of this handle is (String, String)String.
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MethodHandle mh = MethodHandles.lookup().findVirtual(String.class,
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"concat", MethodType.methodType(String.class, String.class));
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// Change it to (CharSequence, String)Object.
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MethodHandle asType = mh.asType(
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MethodType.methodType(Object.class, CharSequence.class, String.class));
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Object obj = asType.invokeExact((CharSequence) getSequence(), "bar");
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assertEquals("foobar", (String) obj);
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// Should fail due to a wrong return type.
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try {
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String str = (String) asType.invokeExact((CharSequence) getSequence(), "bar");
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fail();
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} catch (WrongMethodTypeException expected) {
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}
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// Should fail due to a wrong argument type (String instead of Charsequence).
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try {
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String str = (String) asType.invokeExact("baz", "bar");
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fail();
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} catch (WrongMethodTypeException expected) {
|
}
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// Calls to asType should fail if the types are not convertible.
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//
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// Bad return type conversion.
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try {
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mh.asType(MethodType.methodType(int.class, String.class, String.class));
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fail();
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} catch (WrongMethodTypeException expected) {
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}
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// Bad argument conversion.
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try {
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mh.asType(MethodType.methodType(String.class, int.class, String.class));
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fail();
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} catch (WrongMethodTypeException expected) {
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}
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}
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public static void assertTrue(boolean value) {
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if (!value) {
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throw new AssertionError("assertTrue value: " + value);
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}
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}
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public static void assertFalse(boolean value) {
|
if (value) {
|
throw new AssertionError("assertTrue value: " + value);
|
}
|
}
|
|
public static void assertEquals(int i1, int i2) {
|
if (i1 == i2) { return; }
|
throw new AssertionError("assertEquals i1: " + i1 + ", i2: " + i2);
|
}
|
|
public static void assertEquals(long i1, long i2) {
|
if (i1 == i2) { return; }
|
throw new AssertionError("assertEquals l1: " + i1 + ", l2: " + i2);
|
}
|
|
public static void assertEquals(Object o, Object p) {
|
if (o == p) { return; }
|
if (o != null && p != null && o.equals(p)) { return; }
|
throw new AssertionError("assertEquals: o1: " + o + ", o2: " + p);
|
}
|
|
public static void assertEquals(String s1, String s2) {
|
if (s1 == s2) {
|
return;
|
}
|
|
if (s1 != null && s2 != null && s1.equals(s2)) {
|
return;
|
}
|
|
throw new AssertionError("assertEquals s1: " + s1 + ", s2: " + s2);
|
}
|
|
public static void fail() {
|
System.out.println("fail");
|
Thread.dumpStack();
|
}
|
|
public static void fail(String message) {
|
System.out.println("fail: " + message);
|
Thread.dumpStack();
|
}
|
|
public static void testConstructors() throws Throwable {
|
MethodHandle mh =
|
MethodHandles.lookup().findConstructor(Float.class,
|
MethodType.methodType(void.class,
|
float.class));
|
Float value = (Float) mh.invokeExact(0.33f);
|
if (value.floatValue() != 0.33f) {
|
fail("Unexpected float value from invokeExact " + value.floatValue());
|
}
|
|
value = (Float) mh.invoke(3.34f);
|
if (value.floatValue() != 3.34f) {
|
fail("Unexpected float value from invoke " + value.floatValue());
|
}
|
|
mh = MethodHandles.lookup().findConstructor(Double.class,
|
MethodType.methodType(void.class, String.class));
|
Double d = (Double) mh.invoke("8.45e3");
|
if (d.doubleValue() != 8.45e3) {
|
fail("Unexpected double value from Double(String) " + value.doubleValue());
|
}
|
|
mh = MethodHandles.lookup().findConstructor(Double.class,
|
MethodType.methodType(void.class, double.class));
|
d = (Double) mh.invoke(8.45e3);
|
if (d.doubleValue() != 8.45e3) {
|
fail("Unexpected double value from Double(double) " + value.doubleValue());
|
}
|
|
// Primitive type
|
try {
|
mh = MethodHandles.lookup().findConstructor(int.class, MethodType.methodType(void.class));
|
fail("Unexpected lookup success for primitive constructor");
|
} catch (NoSuchMethodException e) {}
|
|
// Interface
|
try {
|
mh = MethodHandles.lookup().findConstructor(Readable.class,
|
MethodType.methodType(void.class));
|
fail("Unexpected lookup success for interface constructor");
|
} catch (NoSuchMethodException e) {}
|
|
// Abstract
|
mh = MethodHandles.lookup().findConstructor(Process.class, MethodType.methodType(void.class));
|
try {
|
mh.invoke();
|
fail("Unexpected ability to instantiate an abstract class");
|
} catch (InstantiationException e) {}
|
|
// Non-existent
|
try {
|
MethodHandle bad = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(String.class, Float.class));
|
fail("Unexpected success for non-existent constructor");
|
} catch (NoSuchMethodException e) {}
|
|
// Non-void constructor search. (I)I instead of (I)V.
|
try {
|
MethodHandle foo = MethodHandles.lookup().findConstructor(
|
Integer.class, MethodType.methodType(Integer.class, Integer.class));
|
fail("Unexpected success for non-void type for findConstructor");
|
} catch (NoSuchMethodException e) {}
|
|
// Array class constructor.
|
try {
|
MethodHandle foo = MethodHandles.lookup().findConstructor(
|
Object[].class, MethodType.methodType(void.class));
|
fail("Unexpected success for array class type for findConstructor");
|
} catch (NoSuchMethodException e) {}
|
}
|
|
public static void testStringConstructors() throws Throwable {
|
final String testPattern = "The system as we know it is broken";
|
|
// String()
|
MethodHandle mh = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(void.class));
|
String s = (String) mh.invokeExact();
|
if (!s.equals("")) {
|
fail("Unexpected empty string constructor result: '" + s + "'");
|
}
|
|
// String(String)
|
mh = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(void.class, String.class));
|
s = (String) mh.invokeExact(testPattern);
|
if (!s.equals(testPattern)) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(char[])
|
mh = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(void.class, char[].class));
|
s = (String) mh.invokeExact(testPattern.toCharArray());
|
if (!s.equals(testPattern)) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(char[], int, int)
|
mh = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(void.class, char[].class, int.class, int.class));
|
s = (String) mh.invokeExact(new char [] { 'a', 'b', 'c', 'd', 'e'}, 2, 3);
|
if (!s.equals("cde")) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(int[] codePoints, int offset, int count)
|
StringBuffer sb = new StringBuffer(testPattern);
|
int[] codePoints = new int[sb.codePointCount(0, sb.length())];
|
for (int i = 0; i < sb.length(); ++i) {
|
codePoints[i] = sb.codePointAt(i);
|
}
|
mh = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(void.class, int[].class, int.class, int.class));
|
s = (String) mh.invokeExact(codePoints, 0, codePoints.length);
|
if (!s.equals(testPattern)) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(byte ascii[], int hibyte, int offset, int count)
|
byte [] ascii = testPattern.getBytes(StandardCharsets.US_ASCII);
|
mh = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(void.class, byte[].class, int.class, int.class));
|
s = (String) mh.invokeExact(ascii, 0, ascii.length);
|
if (!s.equals(testPattern)) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(byte bytes[], int offset, int length, String charsetName)
|
mh = MethodHandles.lookup().findConstructor(
|
String.class,
|
MethodType.methodType(void.class, byte[].class, int.class, int.class, String.class));
|
s = (String) mh.invokeExact(ascii, 0, 5, StandardCharsets.US_ASCII.name());
|
if (!s.equals(testPattern.substring(0, 5))) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(byte bytes[], int offset, int length, Charset charset)
|
mh = MethodHandles.lookup().findConstructor(
|
String.class,
|
MethodType.methodType(void.class, byte[].class, int.class, int.class, Charset.class));
|
s = (String) mh.invokeExact(ascii, 0, 5, StandardCharsets.US_ASCII);
|
if (!s.equals(testPattern.substring(0, 5))) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(byte bytes[], String charsetName)
|
mh = MethodHandles.lookup().findConstructor(
|
String.class,
|
MethodType.methodType(void.class, byte[].class, String.class));
|
s = (String) mh.invokeExact(ascii, StandardCharsets.US_ASCII.name());
|
if (!s.equals(testPattern)) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(byte bytes[], Charset charset)
|
mh = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(void.class, byte[].class, Charset.class));
|
s = (String) mh.invokeExact(ascii, StandardCharsets.US_ASCII);
|
if (!s.equals(testPattern)) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(byte bytes[], int offset, int length)
|
mh = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(void.class, byte[].class, int.class, int.class));
|
s = (String) mh.invokeExact(ascii, 1, ascii.length - 2);
|
s = testPattern.charAt(0) + s + testPattern.charAt(testPattern.length() - 1);
|
if (!s.equals(testPattern)) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(byte bytes[])
|
mh = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(void.class, byte[].class));
|
s = (String) mh.invokeExact(ascii);
|
if (!s.equals(testPattern)) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
// String(StringBuffer buffer)
|
mh = MethodHandles.lookup().findConstructor(
|
String.class, MethodType.methodType(void.class, StringBuffer.class));
|
s = (String) mh.invokeExact(sb);
|
if (!s.equals(testPattern)) {
|
fail("Unexpected string constructor result: '" + s + "'");
|
}
|
|
System.out.println("String constructors done.");
|
}
|
|
private static void testReturnValues() throws Throwable {
|
Lookup lookup = MethodHandles.lookup();
|
|
// byte
|
MethodHandle mhByteValue =
|
lookup.findVirtual(Byte.class, "byteValue", MethodType.methodType(byte.class));
|
assertEquals((byte) -77, (byte) mhByteValue.invokeExact(Byte.valueOf((byte) -77)));
|
assertEquals((byte) -77, (byte) mhByteValue.invoke(Byte.valueOf((byte) -77)));
|
|
// char
|
MethodHandle mhCharacterValue =
|
lookup.findStaticGetter(Character.class, "MAX_SURROGATE", char.class);
|
assertEquals(Character.MAX_SURROGATE, (char) mhCharacterValue.invokeExact());
|
assertEquals(Character.MAX_SURROGATE, (char) mhCharacterValue.invoke());
|
|
// double
|
MethodHandle mhSin =
|
lookup.findStatic(
|
Math.class, "sin", MethodType.methodType(double.class, double.class));
|
for (double i = -Math.PI; i <= Math.PI; i += Math.PI / 8) {
|
assertEquals(Math.sin(i), (double) mhSin.invokeExact(i));
|
assertEquals(Math.sin(i), (double) mhSin.invoke(i));
|
}
|
|
// float
|
MethodHandle mhAbsFloat =
|
lookup.findStatic(
|
Math.class, "abs", MethodType.methodType(float.class, float.class));
|
assertEquals(Math.abs(-3.3e6f), (float) mhAbsFloat.invokeExact(-3.3e6f));
|
assertEquals(Math.abs(-3.3e6f), (float) mhAbsFloat.invoke(-3.3e6f));
|
|
// int
|
MethodHandle mhAbsInt =
|
lookup.findStatic(Math.class, "abs", MethodType.methodType(int.class, int.class));
|
assertEquals(Math.abs(-1000), (int) mhAbsInt.invokeExact(-1000));
|
assertEquals(Math.abs(-1000), (int) mhAbsInt.invoke(-1000));
|
|
// long
|
MethodHandle mhMaxLong =
|
lookup.findStatic(
|
Math.class,
|
"max",
|
MethodType.methodType(long.class, long.class, long.class));
|
assertEquals(
|
Long.MAX_VALUE, (long) mhMaxLong.invokeExact(Long.MAX_VALUE, Long.MAX_VALUE / 2));
|
assertEquals(Long.MAX_VALUE, (long) mhMaxLong.invoke(Long.MAX_VALUE, Long.MAX_VALUE / 2));
|
assertEquals(0x0123456789abcdefL, (long) mhMaxLong.invokeExact(0x0123456789abcdefL, 0L));
|
assertEquals(0x0123456789abcdefL, (long) mhMaxLong.invoke(0x0123456789abcdefL, 0L));
|
|
// ref
|
MethodHandle mhShortValueOf =
|
lookup.findStatic(
|
Short.class, "valueOf", MethodType.methodType(Short.class, short.class));
|
assertEquals(
|
(short) -7890, ((Short) mhShortValueOf.invokeExact((short) -7890)).shortValue());
|
assertEquals((short) -7890, ((Short) mhShortValueOf.invoke((short) -7890)).shortValue());
|
|
// array
|
int [] array = {Integer.MIN_VALUE, -1, 0, +1, Integer.MAX_VALUE};
|
MethodHandle mhCopyOf =
|
lookup.findStatic(
|
Arrays.class, "copyOf", MethodType.methodType(int[].class, int[].class, int.class));
|
assertTrue(Arrays.equals(array, (int[]) mhCopyOf.invokeExact(array, array.length)));
|
assertTrue(Arrays.equals(array, (int[]) mhCopyOf.invoke(array, array.length)));
|
|
// short
|
MethodHandle mhShortValue =
|
lookup.findVirtual(Short.class, "shortValue", MethodType.methodType(short.class));
|
assertEquals((short) 12131, (short) mhShortValue.invokeExact(Short.valueOf((short) 12131)));
|
assertEquals((short) 12131, (short) mhShortValue.invoke(Short.valueOf((short) 12131)));
|
|
// boolean
|
MethodHandle mhBooleanValue =
|
lookup.findVirtual(
|
Boolean.class, "booleanValue", MethodType.methodType(boolean.class));
|
assertEquals(true, (boolean) mhBooleanValue.invokeExact(Boolean.valueOf(true)));
|
assertEquals(true, (boolean) mhBooleanValue.invoke(Boolean.valueOf(true)));
|
assertEquals(false, (boolean) mhBooleanValue.invokeExact(Boolean.valueOf(false)));
|
assertEquals(false, (boolean) mhBooleanValue.invoke(Boolean.valueOf(false)));
|
|
System.out.println("testReturnValues done.");
|
}
|
|
private static void testReferenceReturnValueConversions() throws Throwable {
|
MethodHandle mh = MethodHandles.lookup().findStatic(
|
Float.class, "valueOf", MethodType.methodType(Float.class, String.class));
|
|
// No conversion
|
Float f = (Float) mh.invokeExact("1.375");
|
if (f.floatValue() != 1.375) {
|
fail();
|
}
|
f = (Float) mh.invoke("1.875");
|
if (f.floatValue() != 1.875) {
|
fail();
|
}
|
|
// Bad conversion
|
try {
|
int i = (int) mh.invokeExact("7.77");
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
try {
|
int i = (int) mh.invoke("7.77");
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Assignment to super-class.
|
Number n = (Number) mh.invoke("1.11");
|
try {
|
Number o = (Number) mh.invokeExact("1.11");
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Assignment to widened boxed primitive class.
|
try {
|
Double u = (Double) mh.invoke("1.11");
|
fail();
|
} catch (ClassCastException e) {}
|
|
try {
|
Double v = (Double) mh.invokeExact("1.11");
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Unboxed
|
float p = (float) mh.invoke("1.11");
|
if (p != 1.11f) {
|
fail();
|
}
|
|
// Unboxed and widened
|
double d = (double) mh.invoke("2.5");
|
if (d != 2.5) {
|
fail();
|
}
|
|
// Interface
|
Comparable<Float> c = (Comparable<Float>) mh.invoke("2.125");
|
if (c.compareTo(new Float(2.125f)) != 0) {
|
fail();
|
}
|
|
System.out.println("testReferenceReturnValueConversions done.");
|
}
|
|
private static void testPrimitiveReturnValueConversions() throws Throwable {
|
MethodHandle mh = MethodHandles.lookup().findStatic(
|
Math.class, "min", MethodType.methodType(int.class, int.class, int.class));
|
|
final int SMALL = -8972;
|
final int LARGE = 7932529;
|
|
// No conversion
|
if ((int) mh.invokeExact(LARGE, SMALL) != SMALL) {
|
fail();
|
} else if ((int) mh.invoke(LARGE, SMALL) != SMALL) {
|
fail();
|
} else if ((int) mh.invokeExact(SMALL, LARGE) != SMALL) {
|
fail();
|
} else if ((int) mh.invoke(SMALL, LARGE) != SMALL) {
|
fail();
|
}
|
|
// int -> long
|
try {
|
if ((long) mh.invokeExact(LARGE, SMALL) != (long) SMALL) {}
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
if ((long) mh.invoke(LARGE, SMALL) != (long) SMALL) {
|
fail();
|
}
|
|
// int -> short
|
try {
|
if ((short) mh.invokeExact(LARGE, SMALL) != (short) SMALL) {}
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
try {
|
if ((short) mh.invoke(LARGE, SMALL) != (short) SMALL) {
|
fail();
|
}
|
} catch (WrongMethodTypeException e) {}
|
|
// int -> Integer
|
try {
|
if (!((Integer) mh.invokeExact(LARGE, SMALL)).equals(new Integer(SMALL))) {}
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
if (!((Integer) mh.invoke(LARGE, SMALL)).equals(new Integer(SMALL))) {
|
fail();
|
}
|
|
// int -> Long
|
try {
|
Long l = (Long) mh.invokeExact(LARGE, SMALL);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
try {
|
Long l = (Long) mh.invoke(LARGE, SMALL);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// int -> Short
|
try {
|
Short s = (Short) mh.invokeExact(LARGE, SMALL);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
try {
|
Short s = (Short) mh.invoke(LARGE, SMALL);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// int -> Process
|
try {
|
Process p = (Process) mh.invokeExact(LARGE, SMALL);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
try {
|
Process p = (Process) mh.invoke(LARGE, SMALL);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// void -> Object
|
mh = MethodHandles.lookup().findStatic(System.class, "gc", MethodType.methodType(void.class));
|
Object o = (Object) mh.invoke();
|
if (o != null) fail();
|
|
// void -> long
|
long l = (long) mh.invoke();
|
if (l != 0) fail();
|
|
// boolean -> Boolean
|
mh = MethodHandles.lookup().findStatic(Boolean.class, "parseBoolean",
|
MethodType.methodType(boolean.class, String.class));
|
Boolean z = (Boolean) mh.invoke("True");
|
if (!z.booleanValue()) fail();
|
|
// boolean -> int
|
try {
|
int dummy = (int) mh.invoke("True");
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// boolean -> Integer
|
try {
|
Integer dummy = (Integer) mh.invoke("True");
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Boolean -> boolean
|
mh = MethodHandles.lookup().findStatic(Boolean.class, "valueOf",
|
MethodType.methodType(Boolean.class, boolean.class));
|
boolean w = (boolean) mh.invoke(false);
|
if (w) fail();
|
|
// Boolean -> int
|
try {
|
int dummy = (int) mh.invoke(false);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Boolean -> Integer
|
try {
|
Integer dummy = (Integer) mh.invoke("True");
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
System.out.println("testPrimitiveReturnValueConversions done.");
|
}
|
|
public static void testReturnValueConversions() throws Throwable {
|
testReferenceReturnValueConversions();
|
testPrimitiveReturnValueConversions();
|
}
|
|
public static class BaseVariableArityTester {
|
public String update(Float f0, Float... floats) {
|
return "base " + f0 + ", " + Arrays.toString(floats);
|
}
|
}
|
|
public static class VariableArityTester extends BaseVariableArityTester {
|
private String lastResult;
|
|
// Constructors
|
public VariableArityTester() {}
|
public VariableArityTester(boolean... booleans) { update(booleans); }
|
public VariableArityTester(byte... bytes) { update(bytes); }
|
public VariableArityTester(char... chars) { update(chars); }
|
public VariableArityTester(short... shorts) { update(shorts); }
|
public VariableArityTester(int... ints) { update(ints); }
|
public VariableArityTester(long... longs) { update(longs); }
|
public VariableArityTester(float... floats) { update(floats); }
|
public VariableArityTester(double... doubles) { update(doubles); }
|
public VariableArityTester(Float f0, Float... floats) { update(f0, floats); }
|
public VariableArityTester(String s0, String... strings) { update(s0, strings); }
|
public VariableArityTester(char c, Number... numbers) { update(c, numbers); }
|
@SafeVarargs
|
public VariableArityTester(ArrayList<Integer> l0, ArrayList<Integer>... lists) {
|
update(l0, lists);
|
}
|
public VariableArityTester(List l0, List... lists) { update(l0, lists); }
|
|
// Methods
|
public String update(boolean... booleans) { return lastResult = tally(booleans); }
|
public String update(byte... bytes) { return lastResult = tally(bytes); }
|
public String update(char... chars) { return lastResult = tally(chars); }
|
public String update(short... shorts) { return lastResult = tally(shorts); }
|
public String update(int... ints) {
|
lastResult = tally(ints);
|
return lastResult;
|
}
|
public String update(long... longs) { return lastResult = tally(longs); }
|
public String update(float... floats) { return lastResult = tally(floats); }
|
public String update(double... doubles) { return lastResult = tally(doubles); }
|
@Override
|
public String update(Float f0, Float... floats) { return lastResult = tally(f0, floats); }
|
public String update(String s0, String... strings) { return lastResult = tally(s0, strings); }
|
public String update(char c, Number... numbers) { return lastResult = tally(c, numbers); }
|
@SafeVarargs
|
public final String update(ArrayList<Integer> l0, ArrayList<Integer>... lists) {
|
lastResult = tally(l0, lists);
|
return lastResult;
|
}
|
public String update(List l0, List... lists) { return lastResult = tally(l0, lists); }
|
|
public String arrayMethod(Object[] o) {
|
return Arrays.deepToString(o);
|
}
|
|
public String lastResult() { return lastResult; }
|
|
// Static Methods
|
public static String tally(boolean... booleans) { return Arrays.toString(booleans); }
|
public static String tally(byte... bytes) { return Arrays.toString(bytes); }
|
public static String tally(char... chars) { return Arrays.toString(chars); }
|
public static String tally(short... shorts) { return Arrays.toString(shorts); }
|
public static String tally(int... ints) { return Arrays.toString(ints); }
|
public static String tally(long... longs) { return Arrays.toString(longs); }
|
public static String tally(float... floats) { return Arrays.toString(floats); }
|
public static String tally(double... doubles) { return Arrays.toString(doubles); }
|
public static String tally(Float f0, Float... floats) {
|
return f0 + ", " + Arrays.toString(floats);
|
}
|
public static String tally(String s0, String... strings) {
|
return s0 + ", " + Arrays.toString(strings);
|
}
|
public static String tally(char c, Number... numbers) {
|
return c + ", " + Arrays.toString(numbers);
|
}
|
@SafeVarargs
|
public static String tally(ArrayList<Integer> l0, ArrayList<Integer>... lists) {
|
return Arrays.toString(l0.toArray()) + ", " + Arrays.deepToString(lists);
|
}
|
public static String tally(List l0, List... lists) {
|
return Arrays.deepToString(l0.toArray()) + ", " + Arrays.deepToString(lists);
|
}
|
public static void foo(int... ints) { System.out.println(Arrays.toString(ints)); }
|
public static long sumToPrimitive(int... ints) {
|
long result = 0;
|
for (int i : ints) result += i;
|
return result;
|
}
|
public static Long sumToReference(int... ints) {
|
System.out.println("Hi");
|
return new Long(sumToPrimitive(ints));
|
}
|
public static MethodHandles.Lookup lookup() {
|
return MethodHandles.lookup();
|
}
|
}
|
|
// This method only exists to fool Jack's handling of types. See b/32536744.
|
public static Object getAsObject(String[] strings) {
|
return (Object) strings;
|
}
|
|
public static void testVariableArity() throws Throwable {
|
MethodHandle mh;
|
VariableArityTester vat = new VariableArityTester();
|
|
assertEquals("[1]", vat.update(1));
|
assertEquals("[1, 1]", vat.update(1, 1));
|
assertEquals("[1, 1, 1]", vat.update(1, 1, 1));
|
|
// Methods - boolean
|
mh = MethodHandles.lookup().findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, boolean[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertFalse(mh.asFixedArity().isVarargsCollector());
|
assertEquals("[]", mh.invoke(vat));
|
assertEquals("[true, false, true]", mh.invoke(vat, true, false, true));
|
assertEquals("[true, false, true]", mh.invoke(vat, new boolean[] { true, false, true}));
|
assertEquals("[false, true]", mh.invoke(vat, Boolean.valueOf(false), Boolean.valueOf(true)));
|
try {
|
mh.invoke(vat, true, true, 0);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
try {
|
assertEquals("[false, true]", mh.invoke(vat, Boolean.valueOf(false), (Boolean) null));
|
fail();
|
} catch (NullPointerException e) {}
|
|
// Methods - byte
|
mh = MethodHandles.lookup().findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, byte[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[]", mh.invoke(vat));
|
assertEquals("[32, 64, 97]", mh.invoke(vat, (byte) 32, Byte.valueOf((byte) 64), (byte) 97));
|
assertEquals("[32, 64, 97]", mh.invoke(vat, new byte[] {(byte) 32, (byte) 64, (byte) 97}));
|
try {
|
mh.invoke(vat, (byte) 1, Integer.valueOf(3), (byte) 0);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Methods - char
|
mh = MethodHandles.lookup().findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, char[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[]", mh.invoke(vat));
|
assertEquals("[A, B, C]", mh.invoke(vat, 'A', Character.valueOf('B'), 'C'));
|
assertEquals("[W, X, Y, Z]", mh.invoke(vat, new char[] { 'W', 'X', 'Y', 'Z' }));
|
|
// Methods - short
|
mh = MethodHandles.lookup().findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, short[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[]", mh.invoke(vat));
|
assertEquals("[32767, -32768, 0]",
|
mh.invoke(vat, Short.MAX_VALUE, Short.MIN_VALUE, Short.valueOf((short) 0)));
|
assertEquals("[1, -1]", mh.invoke(vat, new short[] { (short) 1, (short) -1 }));
|
|
// Methods - int
|
mh = MethodHandles.lookup().findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, int[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[]", mh.invoke(vat));
|
assertEquals("[0, 2147483647, -2147483648, 0]",
|
mh.invoke(vat, Integer.valueOf(0), Integer.MAX_VALUE, Integer.MIN_VALUE, 0));
|
assertEquals("[0, -1, 1, 0]", mh.invoke(vat, new int[] { 0, -1, 1, 0 }));
|
|
assertEquals("[5, 4, 3, 2, 1]", (String) mh.invokeExact(vat, new int [] { 5, 4, 3, 2, 1 }));
|
try {
|
assertEquals("[5, 4, 3, 2, 1]", (String) mh.invokeExact(vat, 5, 4, 3, 2, 1));
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
assertEquals("[5, 4, 3, 2, 1]", (String) mh.invoke(vat, 5, 4, 3, 2, 1));
|
|
// Methods - long
|
mh = MethodHandles.lookup().findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, long[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[]", mh.invoke(vat));
|
assertEquals("[0, 9223372036854775807, -9223372036854775808]",
|
mh.invoke(vat, Long.valueOf(0), Long.MAX_VALUE, Long.MIN_VALUE));
|
assertEquals("[0, -1, 1, 0]", mh.invoke(vat, new long[] { 0, -1, 1, 0 }));
|
|
// Methods - float
|
mh = MethodHandles.lookup().findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, float[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[]", mh.invoke(vat));
|
assertEquals("[0.0, 1.25, -1.25]",
|
mh.invoke(vat, 0.0f, Float.valueOf(1.25f), Float.valueOf(-1.25f)));
|
assertEquals("[0.0, -1.0, 1.0, 0.0]",
|
mh.invoke(vat, new float[] { 0.0f, -1.0f, 1.0f, 0.0f }));
|
|
// Methods - double
|
mh = MethodHandles.lookup().findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, double[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[]", mh.invoke(vat));
|
assertEquals("[0.0, 1.25, -1.25]",
|
mh.invoke(vat, 0.0, Double.valueOf(1.25), Double.valueOf(-1.25)));
|
assertEquals("[0.0, -1.0, 1.0, 0.0]",
|
mh.invoke(vat, new double[] { 0.0, -1.0, 1.0, 0.0 }));
|
mh.invoke(vat, 0.3f, 1.33, 1.33);
|
|
// Methods - String
|
mh = MethodHandles.lookup().
|
findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, String.class, String[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("Echidna, []", mh.invoke(vat, "Echidna"));
|
assertEquals("Bongo, [Jerboa, Okapi]",
|
mh.invoke(vat, "Bongo", "Jerboa", "Okapi"));
|
|
// Methods - Float
|
mh = MethodHandles.lookup().
|
findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, Float.class, Float[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invoke(vat, Float.valueOf(9.99f),
|
new Float[] { Float.valueOf(0.0f),
|
Float.valueOf(0.1f),
|
Float.valueOf(1.1f) }));
|
assertEquals("9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invoke(vat, Float.valueOf(9.99f), Float.valueOf(0.0f),
|
Float.valueOf(0.1f), Float.valueOf(1.1f)));
|
assertEquals("9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invoke(vat, Float.valueOf(9.99f), 0.0f, 0.1f, 1.1f));
|
try {
|
assertEquals("9.99, [77.0, 33.0, 64.0]",
|
(String) mh.invoke(vat, Float.valueOf(9.99f), 77, 33, 64));
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
assertEquals("9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invokeExact(vat, Float.valueOf(9.99f),
|
new Float[] { Float.valueOf(0.0f),
|
Float.valueOf(0.1f),
|
Float.valueOf(1.1f) }));
|
assertEquals("9.99, [0.0, null, 1.1]",
|
(String) mh.invokeExact(vat, Float.valueOf(9.99f),
|
new Float[] { Float.valueOf(0.0f),
|
null,
|
Float.valueOf(1.1f) }));
|
try {
|
assertEquals("9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invokeExact(vat, Float.valueOf(9.99f), 0.0f, 0.1f, 1.1f));
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Methods - Number
|
mh = MethodHandles.lookup().
|
findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, char.class, Number[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertFalse(mh.asFixedArity().isVarargsCollector());
|
assertEquals("x, []", (String) mh.invoke(vat, 'x'));
|
assertEquals("x, [3.141]", (String) mh.invoke(vat, 'x', 3.141));
|
assertEquals("x, [null, 3.131, 37]",
|
(String) mh.invoke(vat, 'x', null, 3.131, new Integer(37)));
|
try {
|
assertEquals("x, [null, 3.131, bad, 37]",
|
(String) mh.invoke(vat, 'x', null, 3.131, "bad", new Integer(37)));
|
assertTrue(false);
|
fail();
|
} catch (ClassCastException e) {}
|
try {
|
assertEquals("x, [null, 3.131, bad, 37]",
|
(String) mh.invoke(
|
vat, 'x', (Process) null, 3.131, "bad", new Integer(37)));
|
assertTrue(false);
|
fail();
|
} catch (ClassCastException e) {}
|
|
// Methods - an array method that is not variable arity.
|
mh = MethodHandles.lookup().findVirtual(
|
VariableArityTester.class, "arrayMethod",
|
MethodType.methodType(String.class, Object[].class));
|
assertFalse(mh.isVarargsCollector());
|
mh.invoke(vat, new Object[] { "123" });
|
try {
|
assertEquals("-", mh.invoke(vat, new Float(3), new Float(4)));
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
mh = mh.asVarargsCollector(Object[].class);
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[3.0, 4.0]", (String) mh.invoke(vat, new Float(3), new Float(4)));
|
|
// Constructors - default
|
mh = MethodHandles.lookup().findConstructor(
|
VariableArityTester.class, MethodType.methodType(void.class));
|
assertFalse(mh.isVarargsCollector());
|
|
// Constructors - boolean
|
mh = MethodHandles.lookup().findConstructor(
|
VariableArityTester.class, MethodType.methodType(void.class, boolean[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[true, true, false]",
|
((VariableArityTester) mh.invoke(new boolean[] {true, true, false})).lastResult());
|
assertEquals("[true, true, false]",
|
((VariableArityTester) mh.invoke(true, true, false)).lastResult());
|
try {
|
assertEquals("[true, true, false]",
|
((VariableArityTester) mh.invokeExact(true, true, false)).lastResult());
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Constructors - byte
|
mh = MethodHandles.lookup().findConstructor(
|
VariableArityTester.class, MethodType.methodType(void.class, byte[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[55, 66, 60]",
|
((VariableArityTester)
|
mh.invoke(new byte[] {(byte) 55, (byte) 66, (byte) 60})).lastResult());
|
assertEquals("[55, 66, 60]",
|
((VariableArityTester) mh.invoke(
|
(byte) 55, (byte) 66, (byte) 60)).lastResult());
|
try {
|
assertEquals("[55, 66, 60]",
|
((VariableArityTester) mh.invokeExact(
|
(byte) 55, (byte) 66, (byte) 60)).lastResult());
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
try {
|
assertEquals("[3, 3]",
|
((VariableArityTester) mh.invoke(
|
new Number[] { Byte.valueOf((byte) 3), (byte) 3})).lastResult());
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Constructors - String (have a different path than other reference types).
|
mh = MethodHandles.lookup().findConstructor(
|
VariableArityTester.class, MethodType.methodType(void.class, String.class, String[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("x, []", ((VariableArityTester) mh.invoke("x")).lastResult());
|
assertEquals("x, [y]", ((VariableArityTester) mh.invoke("x", "y")).lastResult());
|
assertEquals("x, [y, z]",
|
((VariableArityTester) mh.invoke("x", new String[] { "y", "z" })).lastResult());
|
try {
|
assertEquals("x, [y]", ((VariableArityTester) mh.invokeExact("x", "y")).lastResult());
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
assertEquals("x, [null, z]",
|
((VariableArityTester) mh.invoke("x", new String[] { null, "z" })).lastResult());
|
|
// Constructors - Number
|
mh = MethodHandles.lookup().findConstructor(
|
VariableArityTester.class, MethodType.methodType(void.class, char.class, Number[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertFalse(mh.asFixedArity().isVarargsCollector());
|
assertEquals("x, []", ((VariableArityTester) mh.invoke('x')).lastResult());
|
assertEquals("x, [3.141]", ((VariableArityTester) mh.invoke('x', 3.141)).lastResult());
|
assertEquals("x, [null, 3.131, 37]",
|
((VariableArityTester) mh.invoke('x', null, 3.131, new Integer(37))).lastResult());
|
try {
|
assertEquals("x, [null, 3.131, bad, 37]",
|
((VariableArityTester) mh.invoke(
|
'x', null, 3.131, "bad", new Integer(37))).lastResult());
|
assertTrue(false);
|
fail();
|
} catch (ClassCastException e) {}
|
try {
|
assertEquals("x, [null, 3.131, bad, 37]",
|
((VariableArityTester) mh.invoke(
|
'x', (Process) null, 3.131, "bad", new Integer(37))).lastResult());
|
assertTrue(false);
|
fail();
|
} catch (ClassCastException e) {}
|
|
// Static Methods - Float
|
mh = MethodHandles.lookup().
|
findStatic(VariableArityTester.class, "tally",
|
MethodType.methodType(String.class, Float.class, Float[].class));
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invoke(Float.valueOf(9.99f),
|
new Float[] { Float.valueOf(0.0f),
|
Float.valueOf(0.1f),
|
Float.valueOf(1.1f) }));
|
assertEquals("9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invoke(Float.valueOf(9.99f), Float.valueOf(0.0f),
|
Float.valueOf(0.1f), Float.valueOf(1.1f)));
|
assertEquals("9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invoke(Float.valueOf(9.99f), 0.0f, 0.1f, 1.1f));
|
try {
|
assertEquals("9.99, [77.0, 33.0, 64.0]",
|
(String) mh.invoke(Float.valueOf(9.99f), 77, 33, 64));
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
assertEquals("9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invokeExact(Float.valueOf(9.99f),
|
new Float[] { Float.valueOf(0.0f),
|
Float.valueOf(0.1f),
|
Float.valueOf(1.1f) }));
|
assertEquals("9.99, [0.0, null, 1.1]",
|
(String) mh.invokeExact(Float.valueOf(9.99f),
|
new Float[] { Float.valueOf(0.0f),
|
null,
|
Float.valueOf(1.1f) }));
|
try {
|
assertEquals("9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invokeExact(Float.valueOf(9.99f), 0.0f, 0.1f, 1.1f));
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Special methods - Float
|
mh = VariableArityTester.lookup().
|
findSpecial(BaseVariableArityTester.class, "update",
|
MethodType.methodType(String.class, Float.class, Float[].class),
|
VariableArityTester.class);
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("base 9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invoke(vat,
|
Float.valueOf(9.99f),
|
new Float[] { Float.valueOf(0.0f),
|
Float.valueOf(0.1f),
|
Float.valueOf(1.1f) }));
|
assertEquals("base 9.99, [0.0, 0.1, 1.1]",
|
(String) mh.invoke(vat, Float.valueOf(9.99f), Float.valueOf(0.0f),
|
Float.valueOf(0.1f), Float.valueOf(1.1f)));
|
|
// Return value conversions.
|
mh = MethodHandles.lookup().findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, int[].class));
|
assertEquals("[1, 2, 3]", (String) mh.invoke(vat, 1, 2, 3));
|
assertEquals("[1, 2, 3]", (Object) mh.invoke(vat, 1, 2, 3));
|
try {
|
assertEquals("[1, 2, 3, 4]", (long) mh.invoke(vat, 1, 2, 3));
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
assertEquals("[1, 2, 3]", vat.lastResult());
|
mh = MethodHandles.lookup().findStatic(VariableArityTester.class, "sumToPrimitive",
|
MethodType.methodType(long.class, int[].class));
|
assertEquals(10l, (long) mh.invoke(1, 2, 3, 4));
|
assertEquals(Long.valueOf(10l), (Long) mh.invoke(1, 2, 3, 4));
|
mh = MethodHandles.lookup().findStatic(VariableArityTester.class, "sumToReference",
|
MethodType.methodType(Long.class, int[].class));
|
Object o = mh.invoke(1, 2, 3, 4);
|
long l = (long) mh.invoke(1, 2, 3, 4);
|
assertEquals(10l, (long) mh.invoke(1, 2, 3, 4));
|
assertEquals(Long.valueOf(10l), (Long) mh.invoke(1, 2, 3, 4));
|
try {
|
// WrongMethodTypeException should be raised before invoke here.
|
System.out.print("Expect Hi here: ");
|
assertEquals(Long.valueOf(10l), (Byte) mh.invoke(1, 2, 3, 4));
|
fail();
|
} catch (ClassCastException e) {}
|
try {
|
// WrongMethodTypeException should be raised before invoke here.
|
System.out.println("Don't expect Hi now");
|
byte b = (byte) mh.invoke(1, 2, 3, 4);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
|
// Return void produces 0 / null.
|
mh = MethodHandles.lookup().findStatic(VariableArityTester.class, "foo",
|
MethodType.methodType(void.class, int[].class));
|
assertEquals(null, (Object) mh.invoke(3, 2, 1));
|
assertEquals(0l, (long) mh.invoke(1, 2, 3));
|
|
// Combinators
|
mh = MethodHandles.lookup().findVirtual(VariableArityTester.class, "update",
|
MethodType.methodType(String.class, boolean[].class));
|
assertTrue(mh.isVarargsCollector());
|
mh = mh.bindTo(vat);
|
assertFalse(mh.isVarargsCollector());
|
mh = mh.asVarargsCollector(boolean[].class);
|
assertTrue(mh.isVarargsCollector());
|
assertEquals("[]", mh.invoke());
|
assertEquals("[true, false, true]", mh.invoke(true, false, true));
|
assertEquals("[true, false, true]", mh.invoke(new boolean[] { true, false, true}));
|
assertEquals("[false, true]", mh.invoke(Boolean.valueOf(false), Boolean.valueOf(true)));
|
try {
|
mh.invoke(true, true, 0);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
}
|
|
// The same tests as the above, except that we use use MethodHandles.bind instead of
|
// MethodHandle.bindTo.
|
public static void testVariableArity_MethodHandles_bind() throws Throwable {
|
VariableArityTester vat = new VariableArityTester();
|
MethodHandle mh = MethodHandles.lookup().bind(vat, "update",
|
MethodType.methodType(String.class, boolean[].class));
|
assertTrue(mh.isVarargsCollector());
|
|
assertEquals("[]", mh.invoke());
|
assertEquals("[true, false, true]", mh.invoke(true, false, true));
|
assertEquals("[true, false, true]", mh.invoke(new boolean[] { true, false, true}));
|
assertEquals("[false, true]", mh.invoke(Boolean.valueOf(false), Boolean.valueOf(true)));
|
|
try {
|
mh.invoke(true, true, 0);
|
fail();
|
} catch (WrongMethodTypeException e) {}
|
}
|
|
public static void testRevealDirect() throws Throwable {
|
// Test with a virtual method :
|
MethodType type = MethodType.methodType(String.class);
|
MethodHandle handle = MethodHandles.lookup().findVirtual(
|
UnreflectTester.class, "publicMethod", type);
|
|
// Comparisons with an equivalent member obtained via reflection :
|
MethodHandleInfo info = MethodHandles.lookup().revealDirect(handle);
|
Method meth = UnreflectTester.class.getMethod("publicMethod");
|
|
assertEquals(MethodHandleInfo.REF_invokeVirtual, info.getReferenceKind());
|
assertEquals("publicMethod", info.getName());
|
assertTrue(UnreflectTester.class == info.getDeclaringClass());
|
assertFalse(info.isVarArgs());
|
assertEquals(meth, info.reflectAs(Method.class, MethodHandles.lookup()));
|
assertEquals(type, info.getMethodType());
|
|
// Resolution via a public lookup should fail because the method in question
|
// isn't public.
|
try {
|
info.reflectAs(Method.class, MethodHandles.publicLookup());
|
fail();
|
} catch (IllegalArgumentException expected) {
|
}
|
|
// Test with a static method :
|
handle = MethodHandles.lookup().findStatic(UnreflectTester.class,
|
"publicStaticMethod",
|
MethodType.methodType(String.class));
|
|
info = MethodHandles.lookup().revealDirect(handle);
|
meth = UnreflectTester.class.getMethod("publicStaticMethod");
|
assertEquals(MethodHandleInfo.REF_invokeStatic, info.getReferenceKind());
|
assertEquals("publicStaticMethod", info.getName());
|
assertTrue(UnreflectTester.class == info.getDeclaringClass());
|
assertFalse(info.isVarArgs());
|
assertEquals(meth, info.reflectAs(Method.class, MethodHandles.lookup()));
|
assertEquals(type, info.getMethodType());
|
|
// Test with a var-args method :
|
type = MethodType.methodType(String.class, String[].class);
|
handle = MethodHandles.lookup().findVirtual(UnreflectTester.class,
|
"publicVarArgsMethod", type);
|
|
info = MethodHandles.lookup().revealDirect(handle);
|
meth = UnreflectTester.class.getMethod("publicVarArgsMethod", String[].class);
|
assertEquals(MethodHandleInfo.REF_invokeVirtual, info.getReferenceKind());
|
assertEquals("publicVarArgsMethod", info.getName());
|
assertTrue(UnreflectTester.class == info.getDeclaringClass());
|
assertTrue(info.isVarArgs());
|
assertEquals(meth, info.reflectAs(Method.class, MethodHandles.lookup()));
|
assertEquals(type, info.getMethodType());
|
|
// Test with a constructor :
|
Constructor cons = UnreflectTester.class.getConstructor(String.class, boolean.class);
|
type = MethodType.methodType(void.class, String.class, boolean.class);
|
handle = MethodHandles.lookup().findConstructor(UnreflectTester.class, type);
|
|
info = MethodHandles.lookup().revealDirect(handle);
|
assertEquals(MethodHandleInfo.REF_newInvokeSpecial, info.getReferenceKind());
|
assertEquals("<init>", info.getName());
|
assertTrue(UnreflectTester.class == info.getDeclaringClass());
|
assertFalse(info.isVarArgs());
|
assertEquals(cons, info.reflectAs(Constructor.class, MethodHandles.lookup()));
|
assertEquals(type, info.getMethodType());
|
|
// Test with a static field :
|
Field field = UnreflectTester.class.getField("publicStaticField");
|
|
handle = MethodHandles.lookup().findStaticSetter(
|
UnreflectTester.class, "publicStaticField", String.class);
|
|
info = MethodHandles.lookup().revealDirect(handle);
|
assertEquals(MethodHandleInfo.REF_putStatic, info.getReferenceKind());
|
assertEquals("publicStaticField", info.getName());
|
assertTrue(UnreflectTester.class == info.getDeclaringClass());
|
assertFalse(info.isVarArgs());
|
assertEquals(field, info.reflectAs(Field.class, MethodHandles.lookup()));
|
assertEquals(MethodType.methodType(void.class, String.class), info.getMethodType());
|
|
// Test with a setter on the same field, the type of the handle should change
|
// but everything else must remain the same.
|
handle = MethodHandles.lookup().findStaticGetter(
|
UnreflectTester.class, "publicStaticField", String.class);
|
info = MethodHandles.lookup().revealDirect(handle);
|
assertEquals(MethodHandleInfo.REF_getStatic, info.getReferenceKind());
|
assertEquals(field, info.reflectAs(Field.class, MethodHandles.lookup()));
|
assertEquals(MethodType.methodType(String.class), info.getMethodType());
|
|
// Test with an instance field :
|
field = UnreflectTester.class.getField("publicField");
|
|
handle = MethodHandles.lookup().findSetter(
|
UnreflectTester.class, "publicField", String.class);
|
|
info = MethodHandles.lookup().revealDirect(handle);
|
assertEquals(MethodHandleInfo.REF_putField, info.getReferenceKind());
|
assertEquals("publicField", info.getName());
|
assertTrue(UnreflectTester.class == info.getDeclaringClass());
|
assertFalse(info.isVarArgs());
|
assertEquals(field, info.reflectAs(Field.class, MethodHandles.lookup()));
|
assertEquals(MethodType.methodType(void.class, String.class), info.getMethodType());
|
|
// Test with a setter on the same field, the type of the handle should change
|
// but everything else must remain the same.
|
handle = MethodHandles.lookup().findGetter(
|
UnreflectTester.class, "publicField", String.class);
|
info = MethodHandles.lookup().revealDirect(handle);
|
assertEquals(MethodHandleInfo.REF_getField, info.getReferenceKind());
|
assertEquals(field, info.reflectAs(Field.class, MethodHandles.lookup()));
|
assertEquals(MethodType.methodType(String.class), info.getMethodType());
|
}
|
|
public static void testReflectiveCalls() throws Throwable {
|
String[] methodNames = { "invoke", "invokeExact" };
|
for (String methodName : methodNames) {
|
Method invokeMethod = MethodHandle.class.getMethod(methodName, Object[].class);
|
MethodHandle instance =
|
MethodHandles.lookup().findVirtual(java.io.PrintStream.class, "println",
|
MethodType.methodType(void.class, String.class));
|
try {
|
invokeMethod.invoke(instance, new Object[] { new Object[] { Integer.valueOf(1) } } );
|
fail();
|
} catch (InvocationTargetException ite) {
|
assertEquals(ite.getCause().getClass(), UnsupportedOperationException.class);
|
}
|
}
|
}
|
}
|
