russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
350 lines
20 KiB
Java
350 lines
20 KiB
Java
/*
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* Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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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.MethodType;
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import java.lang.invoke.WrongMethodTypeException;
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import java.lang.constant.ClassDesc;
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import java.lang.constant.ConstantDescs;
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import java.lang.constant.DirectMethodHandleDesc;
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import java.lang.constant.MethodHandleDesc;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.lang.constant.MethodTypeDesc;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.function.Supplier;
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import static java.lang.constant.ConstantDescs.CD_Void;
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import static java.lang.constant.ConstantDescs.CD_boolean;
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import static java.lang.constant.DirectMethodHandleDesc.*;
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import static java.lang.constant.DirectMethodHandleDesc.Kind.GETTER;
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import static java.lang.constant.DirectMethodHandleDesc.Kind.SETTER;
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import static java.lang.constant.DirectMethodHandleDesc.Kind.STATIC_GETTER;
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import static java.lang.constant.DirectMethodHandleDesc.Kind.STATIC_SETTER;
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import static java.lang.constant.DirectMethodHandleDesc.Kind.VIRTUAL;
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import static java.lang.constant.ConstantDescs.CD_Integer;
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import static java.lang.constant.ConstantDescs.CD_List;
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import static java.lang.constant.ConstantDescs.CD_Object;
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import static java.lang.constant.ConstantDescs.CD_String;
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import static java.lang.constant.ConstantDescs.CD_int;
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import static java.lang.constant.ConstantDescs.CD_void;
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import static java.lang.invoke.MethodHandleInfo.*;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.*;
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/*
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* @test
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* @compile MethodHandleDescTest.java
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* @run junit MethodHandleDescTest
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* @summary unit tests for java.lang.constant.MethodHandleDesc
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*/
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public class MethodHandleDescTest extends SymbolicDescTest {
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private static ClassDesc helperHolderClass = ClassDesc.of("TestHelpers");
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private static ClassDesc testClass = helperHolderClass.nested("TestClass");
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private static ClassDesc testInterface = helperHolderClass.nested("TestInterface");
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private static ClassDesc testSuperclass = helperHolderClass.nested("TestSuperclass");
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private static void assertMHEquals(MethodHandle expected, MethodHandle actual) {
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MethodHandleInfo expectedInfo = LOOKUP.revealDirect(expected);
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MethodHandleInfo actualInfo = LOOKUP.revealDirect(actual);
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assertEquals(expectedInfo.getDeclaringClass(), actualInfo.getDeclaringClass());
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assertEquals(expectedInfo.getName(), actualInfo.getName());
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assertEquals(expectedInfo.getMethodType(), actualInfo.getMethodType());
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assertEquals(expectedInfo.getReferenceKind(), actualInfo.getReferenceKind());
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}
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private void testMethodHandleDesc(MethodHandleDesc r) throws ReflectiveOperationException {
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if (r instanceof DirectMethodHandleDesc) {
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testSymbolicDesc(r);
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DirectMethodHandleDesc rr = (DirectMethodHandleDesc) r;
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assertEquals(MethodHandleDesc.of(rr.kind(), rr.owner(), rr.methodName(), rr.lookupDescriptor()), r);
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assertEquals(r.resolveConstantDesc(LOOKUP).type(), r.invocationType().resolveConstantDesc(LOOKUP));
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}
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else {
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testSymbolicDescForwardOnly(r);
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}
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}
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private String lookupDescriptor(DirectMethodHandleDesc rr) {
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switch (rr.kind()) {
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case VIRTUAL:
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case SPECIAL:
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case INTERFACE_VIRTUAL:
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case INTERFACE_SPECIAL:
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return rr.invocationType().dropParameterTypes(0, 1).descriptorString();
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case CONSTRUCTOR:
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return rr.invocationType().changeReturnType(CD_void).descriptorString();
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default:
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return rr.invocationType().descriptorString();
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}
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}
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private void testMethodHandleDesc(MethodHandleDesc r, MethodHandle mh) throws ReflectiveOperationException {
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testMethodHandleDesc(r);
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assertMHEquals(mh, r.resolveConstantDesc(LOOKUP));
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assertEquals(r, mh.describeConstable().orElseThrow());
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// compare extractable properties: refKind, owner, name, type
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MethodHandleInfo mhi = LOOKUP.revealDirect(mh);
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DirectMethodHandleDesc rr = (DirectMethodHandleDesc) r;
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assertEquals(rr.owner().descriptorString(), mhi.getDeclaringClass().descriptorString());
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assertEquals(rr.methodName(), mhi.getName());
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assertEquals(rr.kind().refKind, mhi.getReferenceKind());
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MethodType type = mhi.getMethodType();
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assertEquals(lookupDescriptor(rr), type.toMethodDescriptorString());
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}
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@Test
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public void testSimpleMHs() throws ReflectiveOperationException {
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MethodHandle MH_String_isEmpty = LOOKUP.findVirtual(String.class, "isEmpty", MethodType.fromMethodDescriptorString("()Z", null));
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testMethodHandleDesc(MethodHandleDesc.of(Kind.VIRTUAL, CD_String, "isEmpty", "()Z"), MH_String_isEmpty);
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testMethodHandleDesc(MethodHandleDesc.ofMethod(Kind.VIRTUAL, CD_String, "isEmpty", MethodTypeDesc.of(CD_boolean)), MH_String_isEmpty);
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MethodHandle MH_List_isEmpty = LOOKUP.findVirtual(List.class, "isEmpty", MethodType.fromMethodDescriptorString("()Z", null));
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testMethodHandleDesc(MethodHandleDesc.of(Kind.INTERFACE_VIRTUAL, CD_List, "isEmpty", "()Z"), MH_List_isEmpty);
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testMethodHandleDesc(MethodHandleDesc.ofMethod(Kind.INTERFACE_VIRTUAL, CD_List, "isEmpty", MethodTypeDesc.of(CD_boolean)), MH_List_isEmpty);
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MethodHandle MH_String_format = LOOKUP.findStatic(String.class, "format", MethodType.methodType(String.class, String.class, Object[].class));
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testMethodHandleDesc(MethodHandleDesc.of(Kind.STATIC, CD_String, "format", MethodType.methodType(String.class, String.class, Object[].class).descriptorString()),
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MH_String_format);
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testMethodHandleDesc(MethodHandleDesc.ofMethod(Kind.STATIC, CD_String, "format", MethodTypeDesc.of(CD_String, CD_String, CD_Object.arrayType())),
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MH_String_format);
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MethodHandle MH_ArrayList_new = LOOKUP.findConstructor(ArrayList.class, MethodType.methodType(void.class));
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testMethodHandleDesc(MethodHandleDesc.ofMethod(Kind.CONSTRUCTOR, ClassDesc.of("java.util.ArrayList"), "<init>", MethodTypeDesc.of(CD_void)),
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MH_ArrayList_new);
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testMethodHandleDesc(MethodHandleDesc.ofConstructor(ClassDesc.of("java.util.ArrayList")), MH_ArrayList_new);
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assertThrows(IllegalArgumentException.class, () -> MethodHandleDesc.of(Kind.CONSTRUCTOR, ClassDesc.of("java.util.ArrayList"), "<init>", "()I"),
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"bad constructor non void return type");
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assertThrows(NullPointerException.class, () -> MethodHandleDesc.ofConstructor(ClassDesc.of("java.util.ArrayList", null)),
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"null list of parameters");
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assertThrows(NullPointerException.class, () -> MethodHandleDesc.ofConstructor(ClassDesc.of("java.util.ArrayList"), new ClassDesc[] { null }),
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"null elements in list of parameters");
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}
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@Test
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public void testAsType() throws Throwable {
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MethodHandleDesc mhr = MethodHandleDesc.ofMethod(Kind.STATIC, ClassDesc.of("java.lang.Integer"), "valueOf",
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MethodTypeDesc.of(CD_Integer, CD_int));
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MethodHandleDesc takesInteger = mhr.asType(MethodTypeDesc.of(CD_Integer, CD_Integer));
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testMethodHandleDesc(takesInteger);
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MethodHandle mh1 = takesInteger.resolveConstantDesc(LOOKUP);
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assertEquals((Integer) 3, (Integer) mh1.invokeExact((Integer) 3));
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assertEquals("MethodHandleDesc[STATIC/Integer::valueOf(int)Integer].asType(Integer)Integer", takesInteger.toString());
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assertThrows(WrongMethodTypeException.class, () -> {
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Integer _ = (Integer) mh1.invokeExact(3);
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});
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MethodHandleDesc takesInt = takesInteger.asType(MethodTypeDesc.of(CD_Integer, CD_int));
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testMethodHandleDesc(takesInt);
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MethodHandle mh2 = takesInt.resolveConstantDesc(LOOKUP);
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assertEquals((Integer) 3, (Integer) mh2.invokeExact(3));
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assertThrows(WrongMethodTypeException.class, () -> {
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Integer _ = (Integer) mh2.invokeExact((Integer) 3);
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});
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// Short circuit optimization
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MethodHandleDesc same = mhr.asType(mhr.invocationType());
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assertSame(mhr, same);
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assertThrows(NullPointerException.class, () -> mhr.asType(null));
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// @@@ Test varargs adaptation
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// @@@ Test bad adaptations and assert runtime error on resolution
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// @@@ Test intrinsification of adapted MH
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}
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@Test
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public void testMethodHandleDesc() throws Throwable {
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MethodHandleDesc ctorDesc = MethodHandleDesc.of(Kind.CONSTRUCTOR, testClass, "<ignored!>", "()V");
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MethodHandleDesc staticMethodDesc = MethodHandleDesc.of(Kind.STATIC, testClass, "sm", "(I)I");
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MethodHandleDesc staticIMethodDesc = MethodHandleDesc.of(Kind.INTERFACE_STATIC, testInterface, "sm", "(I)I");
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MethodHandleDesc instanceMethodDesc = MethodHandleDesc.of(Kind.VIRTUAL, testClass, "m", "(I)I");
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MethodHandleDesc instanceIMethodDesc = MethodHandleDesc.of(Kind.INTERFACE_VIRTUAL, testInterface, "m", "(I)I");
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MethodHandleDesc superMethodDesc = MethodHandleDesc.of(Kind.SPECIAL, testSuperclass, "m", "(I)I");
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MethodHandleDesc superIMethodDesc = MethodHandleDesc.of(Kind.INTERFACE_SPECIAL, testInterface, "m", "(I)I");
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MethodHandleDesc privateMethodDesc = MethodHandleDesc.of(Kind.SPECIAL, testClass, "pm", "(I)I");
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MethodHandleDesc privateIMethodDesc = MethodHandleDesc.of(Kind.INTERFACE_SPECIAL, testInterface, "pm", "(I)I");
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MethodHandleDesc privateStaticMethodDesc = MethodHandleDesc.of(Kind.STATIC, testClass, "psm", "(I)I");
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MethodHandleDesc privateStaticIMethodDesc = MethodHandleDesc.of(Kind.INTERFACE_STATIC, testInterface, "psm", "(I)I");
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assertEquals(MethodTypeDesc.of(testClass), ctorDesc.invocationType());
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assertEquals("()V", ((DirectMethodHandleDesc) ctorDesc).lookupDescriptor());
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assertEquals("(I)I", staticMethodDesc.invocationType().descriptorString());
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assertEquals("(I)I", ((DirectMethodHandleDesc) staticMethodDesc).lookupDescriptor());
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assertEquals("(" + testClass.descriptorString() + "I)I", instanceMethodDesc.invocationType().descriptorString());
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assertEquals("(I)I", ((DirectMethodHandleDesc) instanceMethodDesc).lookupDescriptor());
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for (MethodHandleDesc r : List.of(ctorDesc, staticMethodDesc, staticIMethodDesc, instanceMethodDesc, instanceIMethodDesc))
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testMethodHandleDesc(r);
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TestHelpers.TestClass instance = (TestHelpers.TestClass) ctorDesc.resolveConstantDesc(LOOKUP).invokeExact();
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TestHelpers.TestClass instance2 = (TestHelpers.TestClass) ctorDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact();
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TestHelpers.TestInterface instanceI = instance;
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assertNotSame(instance, instance2);
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assertEquals(5, (int) staticMethodDesc.resolveConstantDesc(LOOKUP).invokeExact(5));
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assertEquals(5, (int) staticMethodDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(5));
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assertEquals(0, (int) staticIMethodDesc.resolveConstantDesc(LOOKUP).invokeExact(5));
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assertEquals(0, (int) staticIMethodDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(5));
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assertEquals(5, (int) instanceMethodDesc.resolveConstantDesc(LOOKUP).invokeExact(instance, 5));
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assertEquals(5, (int) instanceMethodDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(instance, 5));
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assertEquals(5, (int) instanceIMethodDesc.resolveConstantDesc(LOOKUP).invokeExact(instanceI, 5));
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assertEquals(5, (int) instanceIMethodDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(instanceI, 5));
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assertThrows(IllegalAccessException.class, () -> superMethodDesc.resolveConstantDesc(LOOKUP));
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assertEquals(-1, (int) superMethodDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(instance, 5));
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assertThrows(IllegalAccessException.class, () -> superIMethodDesc.resolveConstantDesc(LOOKUP));
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assertEquals(0, (int) superIMethodDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(instance, 5));
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assertThrows(IllegalAccessException.class, () -> privateMethodDesc.resolveConstantDesc(LOOKUP));
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assertEquals(5, (int) privateMethodDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(instance, 5));
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assertThrows(IllegalAccessException.class, () -> privateIMethodDesc.resolveConstantDesc(LOOKUP));
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assertEquals(0, (int) privateIMethodDesc.resolveConstantDesc(TestHelpers.TestInterface.LOOKUP).invokeExact(instanceI, 5));
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assertEquals(0, (int) privateIMethodDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invoke(instanceI, 5));
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assertThrows(IllegalAccessException.class, () -> privateStaticMethodDesc.resolveConstantDesc(LOOKUP));
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assertEquals(5, (int) privateStaticMethodDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(5));
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assertThrows(IllegalAccessException.class, () -> privateStaticIMethodDesc.resolveConstantDesc(LOOKUP));
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assertEquals(0, (int) privateStaticIMethodDesc.resolveConstantDesc(TestHelpers.TestInterface.LOOKUP).invokeExact(5));
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assertEquals(0, (int) privateStaticIMethodDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(5));
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MethodHandleDesc staticSetterDesc = MethodHandleDesc.ofField(STATIC_SETTER, testClass, "sf", CD_int);
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MethodHandleDesc staticGetterDesc = MethodHandleDesc.ofField(STATIC_GETTER, testClass, "sf", CD_int);
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MethodHandleDesc staticGetterIDesc = MethodHandleDesc.ofField(STATIC_GETTER, testInterface, "sf", CD_int);
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MethodHandleDesc setterDesc = MethodHandleDesc.ofField(SETTER, testClass, "f", CD_int);
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MethodHandleDesc getterDesc = MethodHandleDesc.ofField(GETTER, testClass, "f", CD_int);
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for (MethodHandleDesc r : List.of(staticSetterDesc, staticGetterDesc, staticGetterIDesc, setterDesc, getterDesc))
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testMethodHandleDesc(r);
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staticSetterDesc.resolveConstantDesc(LOOKUP).invokeExact(6); assertEquals(6, TestHelpers.TestClass.sf);
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assertEquals(6, (int) staticGetterDesc.resolveConstantDesc(LOOKUP).invokeExact());
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assertEquals(6, (int) staticGetterDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact());
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staticSetterDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(7); assertEquals(7, TestHelpers.TestClass.sf);
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assertEquals(7, (int) staticGetterDesc.resolveConstantDesc(LOOKUP).invokeExact());
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assertEquals(7, (int) staticGetterDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact());
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assertEquals(3, (int) staticGetterIDesc.resolveConstantDesc(LOOKUP).invokeExact());
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assertEquals(3, (int) staticGetterIDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact());
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setterDesc.resolveConstantDesc(LOOKUP).invokeExact(instance, 6); assertEquals(6, instance.f);
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assertEquals(6, (int) getterDesc.resolveConstantDesc(LOOKUP).invokeExact(instance));
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assertEquals(6, (int) getterDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(instance));
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setterDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(instance, 7); assertEquals(7, instance.f);
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assertEquals(7, (int) getterDesc.resolveConstantDesc(LOOKUP).invokeExact(instance));
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assertEquals(7, (int) getterDesc.resolveConstantDesc(TestHelpers.TestClass.LOOKUP).invokeExact(instance));
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}
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private void assertBadArgs(Supplier<MethodHandleDesc> supplier, String s) {
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assertThrows(IllegalArgumentException.class, supplier::get, s);
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}
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@Test
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public void testBadFieldMHs() {
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List<String> badGetterDescs = List.of("()V", "(Ljava/lang/Object;)V", "(I)I", "(Ljava/lang/Object;I)I");
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List<String> badStaticGetterDescs = List.of("()V", "(Ljava/lang/Object;)I", "(I)I", "(Ljava/lang/Object;I)I");
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List<String> badSetterDescs = List.of("()V", "(I)V", "(Ljava/lang/Object;)V", "(Ljava/lang/Object;I)I", "(Ljava/lang/Object;II)V");
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List<String> badStaticSetterDescs = List.of("()V", "(II)V", "()I");
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badGetterDescs.forEach(s -> assertBadArgs(() -> MethodHandleDesc.of(GETTER, helperHolderClass, "x", s), s));
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badSetterDescs.forEach(s -> assertBadArgs(() -> MethodHandleDesc.of(SETTER, helperHolderClass, "x", s), s));
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badStaticGetterDescs.forEach(s -> assertBadArgs(() -> MethodHandleDesc.of(STATIC_GETTER, helperHolderClass, "x", s), s));
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badStaticSetterDescs.forEach(s -> assertBadArgs(() -> MethodHandleDesc.of(STATIC_SETTER, helperHolderClass, "x", s), s));
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}
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@Test
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public void testBadOwners() {
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assertThrows(IllegalArgumentException.class, () -> MethodHandleDesc.ofMethod(VIRTUAL, ClassDesc.ofDescriptor("I"), "x", MethodTypeDesc.ofDescriptor("()I")));
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}
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@Test
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public void testSymbolicDescsConstants() throws ReflectiveOperationException {
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int tested = 0;
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Field[] fields = ConstantDescs.class.getDeclaredFields();
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for (Field f : fields) {
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try {
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if (f.getType().equals(DirectMethodHandleDesc.class)
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&& ((f.getModifiers() & Modifier.STATIC) != 0)
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&& ((f.getModifiers() & Modifier.PUBLIC) != 0)) {
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MethodHandleDesc r = (MethodHandleDesc) f.get(null);
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MethodHandle m = r.resolveConstantDesc(MethodHandles.lookup());
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testMethodHandleDesc(r, m);
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++tested;
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}
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}
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catch (Throwable e) {
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fail("Error testing field " + f.getName(), e);
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}
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}
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assertTrue(tested > 0);
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}
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@Test
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public void testKind() {
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for (Kind k : Kind.values()) {
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assertEquals(Kind.valueOf(k.refKind, k.refKind == MethodHandleInfo.REF_invokeInterface), Kind.valueOf(k.refKind));
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assertEquals(k, Kind.valueOf(k.refKind, k.isInterface));
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}
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// let's now verify those cases for which the value of the isInterface parameter is ignored
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int[] isInterfaceIgnored = new int[] {
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REF_getField,
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REF_getStatic,
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REF_putField,
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REF_putStatic,
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REF_newInvokeSpecial,
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REF_invokeInterface
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};
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for (int refKind : isInterfaceIgnored) {
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assertEquals(Kind.valueOf(refKind, true), Kind.valueOf(refKind, false));
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}
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// some explicit tests for REF_invokeStatic and REF_invokeSpecial
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assertNotEquals(Kind.valueOf(REF_invokeStatic, true), Kind.valueOf(REF_invokeStatic, false));
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assertNotEquals(Kind.valueOf(REF_invokeSpecial, true), Kind.valueOf(REF_invokeSpecial, false));
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assertEquals(Kind.STATIC, Kind.valueOf(REF_invokeStatic, false));
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assertEquals(Kind.INTERFACE_STATIC, Kind.valueOf(REF_invokeStatic, true));
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assertEquals(Kind.SPECIAL, Kind.valueOf(REF_invokeSpecial, false));
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assertEquals(Kind.INTERFACE_SPECIAL, Kind.valueOf(REF_invokeSpecial, true));
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}
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}
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